Technical field
[0001]
The present invention relates to a laminated core and an electric device.
This application claims priority based on Japanese Patent Application No. 2019-206674 filed in Japan on November 15, 2019, and the contents thereof are incorporated herein by reference.
Background technology
[0002]
A core is used in electrical equipment such as single-phase transformers. As such a core, there are laminated cores such as an EI core, an EE core, and a UI core. In such a laminated core, the directions in which the main magnetic flux flows are two directions orthogonal to each other.
When the electrical steel sheet constituting such a laminated core is a unidirectional electrical steel sheet, the above-mentioned two directions are the direction of the easy magnetization axis (the angle formed by the rolling direction is 0 °) and the difficult magnetization axis. Corresponds to the direction (the angle formed by the rolling direction is 90 °). The unidirectional electrical steel sheet has good magnetic properties in the direction of the easy-magnetizing axis. However, the magnetic characteristics in the direction of the easily magnetized axis are significantly deteriorated with respect to the magnetic characteristics in the direction of the easily magnetized axis. Therefore, the performance of the core deteriorates, such as an increase in iron loss of the entire core.
[0003]
Therefore, in Patent Document 1, the average crystal grain size after hot-rolled sheet annealing is set to 300 μm or more, cold rolling is performed at a reduction rate of 85% or more and 95% or less, and finish annealing is performed at 700 ° C. or higher and 950 ° C. or lower for 10 seconds. It is disclosed that an EI core of a small transformer is formed by using a non-oriented electrical steel sheet which has been subjected to the above for 1 minute or less. This non-oriented electrical steel sheet is excellent in magnetic properties in the directions formed by angles with the rolling direction of 0 ° and 90 °.
prior art documents
patent literature
[0004]
Patent Document 1: Japanese Patent Application Laid-Open No. 2004-332042
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0005]
However, Patent Document 1 does not make a concrete study when a non-oriented electrical steel sheet is applied to an electric device such as a small transformer. Therefore, there is room for improvement in the conventional laminated core for improving the magnetic characteristics.
[0006]
The present invention has been made in view of the above problems, and an object of the present invention is to improve the magnetic characteristics of the laminated core.
Means to solve problems
[0007]
In order to solve the above problems, the present invention adopts the following configuration.
(1) The laminated core according to one aspect of the present invention is a laminated core having a plurality of electromagnetic steel sheets laminated so that the plate surfaces face each other, and each of the plurality of electromagnetic steel sheets is a plurality. A plurality of joints arranged with the leg portion and the direction perpendicular to the extension direction of the leg portion as the extension direction so that a closed magnetic path is formed in the laminated core when the laminated core is excited. The stacking direction of the electromagnetic steel sheets including the iron portions and forming the plurality of legs and the stacking direction of the electrical steel sheets forming the plurality of joint iron portions are the same, and the electromagnetic steel sheets are mass%. C: 0.0100% or less, Si: 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.0100% or less, N: 0.0100% or less, Mn, Ni, Co, Pt, Pb, Cu, Au One or more selected from the group : Total 2.50% to 5.00%, Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%, and One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: A total of 0.0000% to 0.0100% and a Mn content (mass%). ) Is [Mn], Ni content (% by mass) is [Ni], Co content (% by mass) is [Co], Pt content (% by mass) is [Pt], and Pb content (% by mass) is [Pb], Cu content (mass%) is [Cu], Au content (mass%) is [Au], Si content (mass%) is [Si], sol. The Al content (% by mass) was changed to [sol. Al], the following formula (A) is satisfied, the balance has a chemical composition of Fe and impurities, B50 in the rolling direction is B50L, and B50 in the direction in which the angle with the rolling direction is 90 °. When B50C, B50 in one direction of B50 in two directions in which the smaller angle of the rolling direction is 45 °, and B50 in the other direction are B50D1 and B50D2, respectively, the following (B) and (C) are satisfied, the X-ray random intensity ratio of {100} <011> is 5 or more and less than 30, the plate thickness is 0.50 mm or less, and among the angles formed with the rolling direction. The electromagnetic steel plate is arranged so that one of the two directions in which the smaller angle is 45 ° is along either the extending direction of the leg portion or the extending direction of the joint iron portion. The two directions having the best magnetic characteristics are the two directions in which the smaller angle of the rolling direction is 45 °.
([Mn] + [Ni] + [Co] + [Pt] + [Pb] + [Cu] + [Au])-([Si] + [sol.Al])> 0% ... (A)
(B50D1 + B50D2) / 2> 1.7T ... (B)
(B50D1 + B50D2) / 2> (B50L + B50C) / 2 ... (C)
Here, the magnetic flux density B50 is the magnetic flux density when excited with a magnetic field strength of 5000 A / m.
(2) The laminated core described in (1) above may satisfy the following equation (D).
(B50D1 + B50D2) / 2> 1.1 x (B50L + B50C) / 2 ... (D)
(3) The laminated core described in (1) above may satisfy the following equation (E).
(B50D1 + B50D2) / 2> 1.2 x (B50L + B50C) / 2 ... (E)
(4) The laminated core described in (1) above may satisfy the following equation (F).
(B50D1 + B50D2) / 2> 1.8T ... (F)
(5) The laminated core described in (1) above may be an EI core, an EE core, a UI core, or a UU core.
(6) The electric device according to one aspect of the present invention includes a laminated core according to any one of (1) to (5) above and a coil arranged so as to orbit the laminated core. It is characterized by having.
Effect of the invention
[0008]
According to the above aspect of the present invention, the magnetic properties of the laminated core can be improved.
A brief description of the drawing
[0009]
FIG. 1 is a diagram showing a first example of an external configuration of a laminated core.
FIG. 2 is a diagram showing a first example of arrangement of electrical steel sheets in each layer of a laminated core.
FIG. 3 is a diagram showing an example of a method of cutting out an E-type electromagnetic steel plate and an I-type electromagnetic steel plate from an electromagnetic steel strip.
FIG. 4 is a diagram showing a first example of a configuration of an electric device.
FIG. 5 is a diagram showing a second example of the appearance configuration of the laminated core.
FIG. 6 is a diagram showing a second example of the arrangement of electrical steel sheets in each layer of the laminated core.
FIG. 7 is a diagram showing an example of a method of cutting out an E-shaped electromagnetic steel plate from an electromagnetic steel strip.
FIG. 8 is a diagram showing a third example of an external configuration of a laminated core.
FIG. 9 is a diagram showing a third example of the arrangement of electrical steel sheets in each layer of the laminated core.
FIG. 10 is a diagram showing an example of a method of cutting out a U-shaped electromagnetic steel plate and an I-shaped electromagnetic steel plate from an electromagnetic steel strip.
FIG. 11 is a diagram showing a third example of a configuration of an electric device.
FIG. 12 is a diagram showing an example of the relationship between the B50 ratio and the angle from the rolling direction.
FIG. 13 is a diagram showing an example of the relationship between the W15 / 50 ratio and the angle from the rolling direction.
Mode for carrying out the invention
[0010]
(Electromagnetic steel sheet used for laminated core)
First, the electromagnetic steel sheet used for the laminated core of the embodiment described later will be described.
First, the chemical composition of the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, and the steel material used in the manufacturing method thereof will be described. In the following description, "%", which is a unit of the content of each element contained in non-oriented electrical steel sheets or steel materials, means "mass%" unless otherwise specified. In addition, the lower limit value and the upper limit value are included in the numerical limitation range described with "~" in between. Numerical values ​​that indicate "less than" or "greater than" do not fall within the numerical range. Non-oriented electrical steel sheets and steel materials, which are examples of electrical steel sheets used for laminated cores, have a chemical composition in which ferrite-austenite transformation (hereinafter, α-γ transformation) can occur, and C: 0.0100% or less, Si. : 1.50% to 4.00%, sol. Al: 0.0001% to 1.0%, S: 0.0100% or less, N: 0.0100% or less, Mn, Ni, Co, Pt, Pb, Cu, Au One or more selected from the group : Total 2.50% to 5.00%, Sn: 0.000% to 0.400%, Sb: 0.000% to 0.400%, P: 0.000% to 0.400%, and One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, and Cd: Containing a total of 0.0000% to 0.0100%, the balance being Fe and impurities. It has a chemical composition consisting of. Furthermore, Mn, Ni, Co, Pt, Pb, Cu, Au, Si and sol. The Al content satisfies a predetermined condition described later. Examples of impurities include those contained in raw materials such as ore and scrap, and those contained in the manufacturing process.
[0011]
<< C: 0.0100% or less >>
C increases iron loss and causes magnetic aging. Therefore, the lower the C content, the better. Such a phenomenon is remarkable when the C content exceeds 0.0100%. Therefore, the C content is set to 0.0100% or less. The reduction of the C content also contributes to the uniform improvement of the magnetic properties in all directions in the plate surface. Although the lower limit of the C content is not particularly limited, it is preferably 0.0005% or more in consideration of the cost of decarburization treatment at the time of refining.
[0012]
<< Si: 1.50% to 4.00% >>
Si increases the electrical resistance, reduces the eddy current loss, reduces the iron loss, increases the yield ratio, and improves the punching workability to the iron core. If the Si content is less than 1.50%, these effects cannot be sufficiently obtained. Therefore, the Si content is 1.50% or more. On the other hand, when the Si content exceeds 4.00%, the magnetic flux density decreases, the punching workability decreases due to an excessive increase in hardness, and cold rolling becomes difficult. Therefore, the Si content is set to 4.00% or less.
[0013]
<< sol. Al: 0.0001% -1.0% >>
Sol. Al increases electrical resistance, reduces eddy current loss, and reduces iron loss. sol. Al also contributes to the improvement of the relative magnitude of the magnetic flux density B50 with respect to the saturation magnetic flux density. Here, the magnetic flux density B50 is the magnetic flux density when excited with a magnetic field strength of 5000 A / m. sol. If the Al content is less than 0.0001%, these effects cannot be sufficiently obtained. Al also has a desulfurization promoting effect in steelmaking. Therefore, sol. The Al content is 0.0001% or more. On the other hand, sol. When the Al content exceeds 1.0%, the magnetic flux density is lowered, the yield ratio is lowered, and the punching workability is lowered. Therefore, sol. The Al content is 1.0% or less.
[0014]
<< S: 0.0100% or less >>
S is not an essential element and is contained as an impurity in steel, for example. S inhibits recrystallization and grain growth during annealing due to the precipitation of fine MnS. Therefore, the lower the S content, the better. The increase in iron loss and the decrease in magnetic flux density due to the inhibition of recrystallization and grain growth are remarkable when the S content exceeds 0.0100%. Therefore, the S content is set to 0.0100% or less. Although the lower limit of the S content is not particularly limited, it is preferably 0.0003% or more in consideration of the cost of desulfurization treatment at the time of refining.
[0015]
<< N: 0.0100% or less >>
Similar to C, N deteriorates the magnetic characteristics, so the lower the N content, the better. Therefore, the N content is 0.0100% or less. Although the lower limit of the N content is not particularly limited, it is preferably 0.0010% or more in consideration of the cost of denitrification treatment at the time of refining.
[0016]
<< One or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, Au: 2.50% to 5.00% in total >>
Since these elements are elements necessary to cause α-γ transformation, it is necessary to contain these elements in total of 2.50% or more.
be. On the other hand, if the total content exceeds 5.00%, the cost increases and the magnetic flux density may decrease. Therefore, the total content of these elements is set to 5.00% or less.
[0017]
In addition, it is assumed that the following conditions are satisfied as conditions under which α-γ transformation can occur. That is, [Mn] is the Mn content (% by mass), [Ni] is the Ni content (% by mass), [Co] is the Co content (% by mass), [Pt] is the Pt content (% by mass), Pb content (% by mass) is [Pb], Cu content (% by mass) is [Cu], Au content (% by mass) is [Au], Si content (% by mass) is [Si], sol. The Al content (% by mass) is measured as [sol. Al], it is preferable that the following formula (1) is satisfied in terms of % by mass.
([Mn] + [Ni] + [Co] + [Pt] + [Pb] + [Cu] + [Au]) - ([Si] + [sol. Al]) > 0% (1)
[0018]
If the above formula (1) is not satisfied, the α-γ transformation does not occur, resulting in a low magnetic flux density.
[0019]
<>
Sn and Sb improve the texture after cold rolling and recrystallization, and improve the magnetic flux density. Therefore, these elements may be contained as necessary, but if contained excessively, they embrittle the steel. Therefore, both Sn content and Sb content are set to 0.400% or less. Also, P may be contained in order to ensure the hardness of the steel sheet after recrystallization, but if contained excessively, it causes the embrittlement of the steel. Therefore, the P content should be 0.400% or less. In the case of imparting further effects such as magnetic properties as described above, 0.020% to 0.400% Sn, 0.020% to 0.400% Sb, and 0.020% to 0.400% % of one or more selected from the group consisting of P.
[0020]
<>
Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn and Cd react with S in molten steel during casting to form sulfide or oxysulfide or both precipitates. Hereinafter, Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn and Cd may be collectively referred to as "coarse precipitate forming elements". The grain size of coarse precipitate-forming elements is about 1 μm to 2 μm, which is much larger than the grain size (about 100 nm) of fine precipitates such as MnS, TiN and AlN. For this reason, these fine precipitates adhere to the precipitates of the coarse precipitate-forming element and are less likely to hinder recrystallization and grain growth during intermediate annealing. In order to sufficiently obtain these effects, the total content of these elements is preferably 0.0005% or more. However, if the total amount of these elements exceeds 0.0100%, the total amount of sulfides or oxysulfides or both becomes excessive, inhibiting recrystallization and grain growth during intermediate annealing. Therefore, the total content of coarse precipitate-forming elements is set to 0.0100% or less.
[0021]
<>
Next, the texture of a non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, will be described. The details of the manufacturing method will be described later, but the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, has a chemical composition that can cause α-γ transformation, and is rapidly cooled immediately after the finish rolling in hot rolling. By refining the structure by , it becomes a structure in which {100} crystal grains grow. As a result, the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, has an integrated strength of 5 to 30 in the {100} <011> orientation, and the magnetic flux density B50 in the direction of 45° to the rolling direction is particularly get higher Thus, although the magnetic flux density is high in a specific direction, a high magnetic flux density is obtained on average in all directions as a whole. If the {100}<011> direction integration intensity is less than 5, the {111}<112> direction integration intensity, which lowers the magnetic flux density, increases, and the overall magnetic flux density decreases. In addition, the production method in which the integrated strength in the {100}<011> orientation exceeds 30 requires a thick hot-rolled sheet, which poses a problem of difficulty in production.
[0022]
The integrated intensity of the {100}<011> orientation can be measured by an X-ray diffraction method or an electron backscatter diffraction (EBSD) method. Since the angle of reflection of X-rays and electron beams from a sample differs for each crystal orientation, the crystal orientation intensity can be obtained from the reflection intensity and the like with reference to a randomly oriented sample. The integrated intensity of the {100}<011> orientation of a non-oriented electrical steel sheet suitable as an example of the electrical steel sheet used for the laminated core is 5 to 30 in terms of the X-ray random intensity ratio. At this time, a value obtained by measuring the crystal orientation by EBSD and converting it into an X-ray random intensity ratio may be used.
[0023]
<>
Next, the thickness of the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, will be described. The thickness of the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, is 0.50 mm or less. If the thickness exceeds 0.50 mm, excellent high-frequency iron loss cannot be obtained. Therefore, the thickness should be 0.50 mm or less.
[0024]
<>
Next, the magnetic properties of a non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, will be described. When examining the magnetic properties, the value of B50, which is the magnetic flux density of a non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, is measured. In the manufactured non-oriented electrical steel sheet, it is impossible to distinguish between one rolling direction and the other. Therefore, in this embodiment, the rolling direction refers to both one and the other. B50L is the value of B50 (T) in the rolling direction, B50D1 is the value of B50 (T) in the direction inclined by 45° from the rolling direction, B50C is the value of B50 (T) in the direction inclined by 90° from the rolling direction, and the rolling direction Assuming that the value of B50(T) in the direction inclined 135° from is B50D2, the anisotropy of magnetic flux density is observed such that B50D1 and B50D2 are the highest and B50L and B50C are the lowest. Note that (T) indicates the unit of magnetic flux density (Tesla).
[0025]
Here, for example, when considering the omnidirectional (0 ° to 360 °) distribution of the magnetic flux density with the clockwise (or counterclockwise) direction as the positive direction, the rolling direction is 0 ° (one direction) and 180 ° ° (other direction), B50D1 has B50 values ​​of 45° and 225°, and B50D2 has B50 values ​​of 135° and 315°. Similarly, B50L results in B50 values ​​of 0° and 180°, and B50C results in B50 values ​​of 90° and 270°. The 45° and 225° B50 values ​​are in close agreement, and the 135° and 315° B50 values ​​are in close agreement. However, B50D1 and B50D2 may not be exactly the same, since it may not be easy to make the magnetic properties the same in actual manufacturing. Similarly, the 0° and 180° B50 values ​​are closely matched, the 90° and 270° B50 values ​​are closely matched, while the B50L and B50C are closely matched. may not. A non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, uses the average values ​​of B50D1 and B50D2 and the average values ​​of B50L and B50C to satisfy the following equations (2) and (3). .
(B50D1+B50D2)/2>1.7T (2)
(B50D1+B50D2)/2>(B50L+B50C)/2 (3)
[0026]
In this way, when the magnetic flux density is measured, the average value of B50D1 and B50D2 is 1.7 T or more as in equation (2), and high anisotropy in magnetic flux density is confirmed as in equation (3). .
[0027]
Furthermore, in addition to satisfying the formula (1), it is preferable that the anisotropy of the magnetic flux density is higher than that of the formula (3), as in the following formula (4).
(B50D1+B50D2)/2>1.1×(B50L+B50C)/2 (4)
Furthermore, it is preferable that the anisotropy of the magnetic flux density is higher, as in the following equation (5).
(B50D1+B50D2)/2>1.2×(B50L+B50C)/2 (5)
Furthermore, it is preferable that the average value of B50D1 and B50D2 is 1.8T or more, as in the following formula (6).
(B50D1+B50D2)/2>1.8T (6)
[0028]
In addition, the above 45° is a theoretical value, and since it may not be easy to match it to 45° in actual manufacturing, it includes values ​​that do not strictly match 45°. This is the same for 0°, 90°, 135°, 180°, 225°, 270° and 315°.
[0029]
The magnetic flux density can be measured by cutting out a 55 mm square sample from the direction of 45°, 0°, etc. with respect to the rolling direction and using a single plate magnetic measurement device.
[0030]
<>
Next, an example of a method for manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, will be described. When manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, for example, hot rolling, cold rolling (first cold rolling), intermediate annealing (first annealing), Skin pass rolling (second cold rolling), finish annealing (third annealing), stress relief annealing (second annealing), and the like are performed.
[0031]
First, the steel materials mentioned above are heated and hot rolled. The steel material is, for example, a slab produced by normal continuous casting. Rough rolling and finish rolling of hot rolling are performed at a temperature in the γ region (Ar1 temperature or higher). That is, hot rolling is performed so that the finish rolling temperature is Ar1 temperature or higher and the coiling temperature is higher than 250° C. and lower than or equal to 600° C. As a result, the subsequent cooling transforms austenite into ferrite, thereby refining the structure. If the grains are then cold-rolled in a refined state, bulging recrystallization (hereinafter referred to as bulging) is likely to occur, so that {100} crystal grains, which are normally difficult to grow, can be easily grown.
[0032]
Further, when manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, the temperature (finishing temperature) when passing through the final pass of finish rolling is Ar1 temperature or higher, and the coiling temperature is The temperature should be over 250°C and 600°C or less. The crystal structure is refined by transforming from austenite to ferrite. By refining the crystal structure in this manner, bulging can be easily generated through subsequent cold rolling and intermediate annealing.
[0033]
After that, the hot-rolled steel sheet is coiled without being annealed, pickled, and cold-rolled to the hot-rolled steel sheet. In cold rolling, it is preferable to set the rolling reduction to 80% to 95%. If the rolling reduction is less than 80%, bulging is less likely to occur. If the rolling reduction exceeds 95%, the {100} crystal grains tend to grow due to the subsequent bulging, but the hot-rolled steel sheet must be thickened, making it difficult to wind the hot-rolled steel sheet and making the operation difficult. easier. The draft of cold rolling is more preferably 86% or more. Bulging is less likely to occur when the rolling reduction of cold rolling is 86% or more.
[0034]
After cold rolling is completed, intermediate annealing is performed. When manufacturing a non-oriented electrical steel sheet, which is an example of an electrical steel sheet used for a laminated core, intermediate annealing is performed at a temperature that does not transform into austenite. That is, it is preferable to set the temperature of the intermediate annealing to less than the Ac1 temperature. Such intermediate annealing causes bulging and facilitates the growth of {100} crystal grains. Also, the time for the intermediate annealing is preferably 5 seconds to 60 seconds.
[0035]
After intermediate annealing is completed, skin pass rolling is performed next. As described above, when skin-pass rolling and annealing are performed in a state where bulging occurs, {100} crystal grains grow further starting from the portion where bulging occurs. This is because the {100}<011> crystal grains are less likely to be strained by skin-pass rolling, and the {111}<1
12> Crystal grains have the property that strain is likely to accumulate. be. This erosion phenomenon caused by the strain difference as a driving force is called strain-induced grain boundary migration (SIBM). The rolling reduction of skin pass rolling is preferably 5% to 25%. If the rolling reduction is less than 5%, the amount of strain is too small, so SIBM does not occur in subsequent annealing, and the {100}<011> crystal grains do not grow. On the other hand, if the rolling reduction exceeds 25%, the amount of strain becomes too large, and recrystallization nucleation (hereinafter referred to as nucleation) occurs in which new crystal grains are generated from {111}<112> crystal grains. Since most of the grains generated in this nucleation are {111}<112> crystal grains, the magnetic properties deteriorate.
[0036]
After skin-pass rolling, finish annealing is performed to release strain and improve workability. The finish annealing is similarly performed at a temperature at which the steel does not transform into austenite, and the finish annealing temperature is lower than the Ac1 temperature. By performing finish annealing in this manner, the {100}<011> crystal grains eat away the {111}<112> crystal grains, and the magnetic properties can be improved. Also, the time from 600° C. to Ac1 temperature during finish annealing is set within 1200 seconds. If the annealing time is too short, most of the strain introduced by the skin pass remains, and warping occurs when punching a complicated shape. On the other hand, if the annealing time is too long, the crystal grains become too coarse, resulting in large sag during punching and poor punching accuracy.
[0037]
After the finish annealing is completed, the non-oriented electrical steel sheet is processed to form the desired steel member. Then, the steel member made of the non-oriented electrical steel sheet is subjected to stress relief annealing in order to remove strain and the like caused by forming (for example, punching) of the steel member. In the present embodiment, in order to generate SIBM below the Ac1 temperature and make the crystal grain size coarse, the temperature of the stress relief annealing is set to, for example, about 800° C., and the stress relief annealing time is about 2 hours. and Magnetic properties can be improved by stress relief annealing.
[0038]
In the non-oriented electrical steel sheet (steel member), which is an example of the electrical steel sheet used for the laminated core, the above (1 ) and excellent anisotropy of formula (2) above are obtained. Furthermore, in the cold rolling process, the reduction rate is set to about 85%, and the reduction rate in the skin pass rolling process is set to about 10% in the formula (3). is obtained.
In addition, in this embodiment, the Ar1 temperature is obtained from the change in thermal expansion of the steel material (steel plate) during cooling at an average cooling rate of 1°C/sec. Further, in the present embodiment, the Ac1 temperature is obtained from the change in thermal expansion of the steel material (steel plate) being heated at an average heating rate of 1° C./sec.
[0039]
As described above, as an example of the electromagnetic steel sheets used for the laminated core, steel members made of non-oriented electromagnetic steel sheets can be manufactured.
[0040]
Next, the non-oriented electrical steel sheet, which is an example of the electrical steel sheet used for the laminated core, will be specifically described with reference to examples. The examples shown below are merely examples of non-oriented electrical steel sheets, and the non-oriented electrical steel sheets are not limited to the following examples.
[0041]
<>
By casting molten steel, ingots with the components shown in Tables 1 and 2 below were produced. Here, the left side of the equation represents the value of the left side of the above equation (1). After that, the produced ingot was heated to 1150° C. and hot rolled so as to have a plate thickness of 2.5 mm. After finish rolling, the hot-rolled steel sheet was water-cooled and wound up. The temperature (finishing temperature) at the stage of the final pass of finish rolling at this time was 830° C., and all of them were higher than the Ar1 temperature. In addition, No. 1 where γ-α transformation does not occur. For No. 108, the finishing temperature was 850°C. Further, the winding temperature was set under the conditions shown in Table 1.
[0042]
Next, the hot-rolled steel sheet was pickled to remove scales, and rolled at the rolling reduction after cold rolling shown in Table 1. Then, intermediate annealing was performed at 700° C. for 30 seconds in a non-oxidizing atmosphere. Then, it was rolled at the second cold rolling (skin pass rolling) reduction shown in Table 1.
[0043]
Next, in order to examine the magnetic properties, after the second cold rolling (skin pass rolling), final annealing was performed at 800°C for 30 seconds, and a 55 mm square sample was prepared by shearing, followed by annealing at 800°C for 2 hours. Stress relief annealing was performed and the magnetic flux density B50 was measured. A sample of 55 mm square was taken in two directions of 0° and 45° in the rolling direction. These two types of samples were measured, and the magnetic flux densities B50 at 0°, 45°, 90° and 135° with respect to the rolling direction were defined as B50L, B50D1, B50C and B50D2, respectively.
[0044]
[table 1]

[0045]
[Table 2]

[0046]
The underlines in Tables 1 and 2 indicate conditions outside the scope of the present invention. No. 1, which is an example of the invention. 101 to No. 107, No. 109-No. 111, No. 114 to No. 130 had a good value of magnetic flux density B50 both in the 45° direction and on the average around the circumference. However, no. 116 and No. 127 was out of the appropriate winding temperature, so the magnetic flux density B50 was slightly low. No. 129 and No. No. 130, which has the same composition and coiling temperature, has a low rolling reduction in cold rolling. The magnetic flux density B50 was slightly lower than that of 118. On the other hand, no. In No. 108, the Si concentration was high, the value on the left side of the formula was 0 or less, and the composition did not undergo α-γ transformation, so the magnetic flux density B50 was low in all cases. Comparative example No. In No. 112, the skin pass rolling rate was lowered, so the {100}<011> strength was less than 5 and the magnetic flux density B50 was low. Comparative example No. 113 has a {100}<011> strength of 30 or more, which is out of the scope of the present invention. No. In No. 113, the thickness of the hot-rolled plate was as high as 7 mm, so there was a problem that it was difficult to operate.
[0047]
<>
By casting molten steel, an ingot with the components shown in Table 3 below was produced. After that, the produced ingot was heated to 1150° C. and hot rolled so as to have a plate thickness of 2.5 mm. After finish rolling, the hot-rolled steel sheet was water-cooled and wound up. The finishing temperature at the stage of the final pass of finish rolling at this time was 830° C., which was higher than the Ar1 temperature in all cases.
[0048]
Next, the hot-rolled steel sheet was pickled to remove scales, and cold-rolled until the sheet thickness reached 0.385 mm. Then, intermediate annealing was performed in a non-oxidizing atmosphere, and the temperature of the intermediate annealing was controlled so that the recrystallization rate was 85%. Then, the second cold rolling (skin pass rolling) was performed until the sheet thickness reached 0.35 mm.
[0049]
Next, in order to examine the magnetic properties, after the second cold rolling (skin pass rolling), final annealing was performed at 800°C for 30 seconds, and a 55 mm square sample was prepared by shearing, followed by annealing at 800°C for 2 hours. After strain relief annealing, magnetic flux density B50 and core loss W10/400 were measured. The magnetic flux density B50 was measured in the same procedure as in the first example. On the other hand, iron loss W10/400 was measured as energy loss (W/kg) generated in the sample when an alternating magnetic field of 400 Hz was applied so that the maximum magnetic flux density was 1.0T. Iron loss was the average value of the results of measurements at 0°, 45°, 90° and 135° with respect to the rolling direction.
[0050]
[Table 3]

[0051]
[Table 4]

[0052]
　No. 201 to No. All No. 214 are invention examples, and all of them had good magnetic properties. In particular, No. 202-No. 204 is No. 201, No. 205-No. The magnetic flux density B50 is higher than that of No. 214. 205-No. 214 is No. 201 to No. Iron loss W10/400 was lower than that of 204.
[0053]
The present inventors have studied how to configure a laminated core so as to effectively utilize the properties of such a non-oriented electrical steel sheet, and have found the embodiments described below.
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the magnetic steel sheet is the non-oriented magnetic steel sheet described in the section (Electronic steel sheet used for laminated core). In the following description, in the description of (Electrical steel sheet used for laminated core), the direction inclined by 45° from the rolling direction and the direction inclined by 135° from the rolling direction are, if necessary, the angle formed with the rolling direction. are collectively referred to as two directions in which the smaller angle is 45°. It should be noted that the 45° is expressed as having a positive value for both clockwise and counterclockwise angles. If the clockwise direction is the negative direction and the counterclockwise direction is the positive direction, the two directions with the smaller angle of 45° with the rolling direction are There are two directions of 45° and -45°. In addition, a direction inclined by θ° from the rolling direction is referred to as a direction forming an angle of θ° with the rolling direction, as required. Thus, the direction inclined θ° from the rolling direction and the direction forming an angle θ° with the rolling direction have the same meaning. In addition, in the following description, the same (matching) in length, direction, position, etc. means (strictly) the same (matching), and within a range that does not deviate from the gist of the invention (for example, , within the range of error occurring in the manufacturing process) and being the same (matching). Also, in each figure, the XYZ coordinates indicate the orientation relationship in each figure. A symbol with a ● inside a circle indicates the direction from the back side of the paper to the front side.
[0054]
(First embodiment)
First, the first embodiment will be described. In this embodiment, a case where the laminated core is an EI core will be described as an example.
FIG. 1 is a diagram showing an example of the external configuration of the laminated core 100. FIG. In addition, in FIG. 1, "..." shown side by side in the Z-axis direction indicates that the illustrated ones are continuously and repeatedly arranged in the negative direction of the Z-axis (this also applies to other drawings). are the same). FIG. 2 is a diagram showing an example of the arrangement of the magnetic steel sheets in each layer of the laminated core 100. As shown in FIG. FIG. 2(a) is a diagram showing an example of arrangement of odd-numbered magnetic steel sheets from the top (counting from the positive side of the Z-axis). FIG. 2B is a diagram showing an example of the arrangement of even-numbered magnetic steel sheets from the top.
[0055]
In FIGS. 1 and 2, the laminated core 100 has a plurality of E-shaped magnetic steel sheets 110 and a plurality of I-shaped magnetic steel sheets 120 .
The laminated core 100 has three legs 210a to 210c arranged with intervals in the Y-axis direction, and the longitudinal direction (extending direction) in the Y-axis direction. and two yoke portions 220a to 220b arranged with an interval in the X-axis direction. One of the two yoke portions 220a-220b is arranged at one end of the three legs 210a-210c in the longitudinal direction (X-axis direction). The other of the two yoke portions 220a-220b is arranged at the other end in the longitudinal direction (X-axis direction) of the three leg portions 210a-210c. The three legs 210a-210c and the two yokes 220a-220b are magnetically coupled. As shown in FIGS. 2(a) and 2(b), the shape of the plate surface in the same layer of the laminated core 100 is generally a Japanese character combining E and I (a squared figure 8, squarish eight shape).
[0056]
The E-shaped electromagnetic steel sheet 110 constitutes three leg portions 210a to 210c of the laminated core 100 and one of the two yoke portions 220a to 220b of the laminated core 100. The three leg portions 210a to 210c formed by the E-shaped magnetic steel plate 110 and the yoke portions 220a to 220b formed by the E-shaped magnetic steel plate 110 are integrally formed by being cut out as described later. , and there is no boundary to be described later. The I-shaped magnetic steel sheet 120 constitutes one of the two yoke portions 220 a to 220 b of the laminated core 100 . The yoke portions 220a to 220b constituted by the I-shaped magnetic steel plate 120 and the E-shaped magnetic steel plate 110 are constituted.The three legs 210a-210c are bounded by combining E and I.
The shorter the distance between the E-shaped magnetic steel sheet 110 and the I-shaped magnetic steel sheet 120 arranged in the same layer, the better. What are the plate thickness portions at the tips of the three leg portions 210a to 210c formed by the E-shaped magnetic steel plates 110 and the plate thickness portions of the yoke portions 220a to 220b formed by the I-shaped magnetic steel plates 120 arranged in the same layer? Contact is more preferred.
[0057]
The direction in which the E-type magnetic steel sheet 110 has the best magnetic properties is the longitudinal direction (X-axis direction) of the three legs 210a to 210c of the E-type magnetic steel sheet 110, and the E-type magnetic steel sheet 110. It coincides with the longitudinal direction (Y-axis direction) of the yoke portions 220a and 220b.
The direction in which the I-type magnetic steel sheet 120 has the best magnetic properties coincides with the longitudinal direction (Y-axis direction) of the yoke portions 220a to 220b formed by the I-type magnetic steel sheet 120.
In the following description, the direction with the best magnetic properties will be referred to as the direction of easy magnetization as necessary.
[0058]
FIG. 3 is a diagram showing an example of a method of cutting out the E-shaped magnetic steel sheet 110 and the I-shaped magnetic steel sheet 120 from an electromagnetic steel sheet unwound from a coiled state. In the following description, an electromagnetic steel sheet unwound from a coiled state is simply referred to as an electromagnetic steel strip as necessary. For convenience of explanation, FIG. 3 also shows leg portions 210a to 210c and yoke portions 220a to 220b corresponding to the electromagnetic steel plates cut out.
In FIG. 3, a virtual line 310 indicated by a dashed dotted line indicates the rolling direction of the electrical steel strip (hereinafter also referred to as the rolling direction 310). Virtual lines 320a to 320b indicated by dashed lines indicate directions of easy magnetization of the magnetic steel strip (hereinafter also referred to as directions of easy magnetization 320a to 320b). In FIG. 3, all directions parallel to the virtual line 310 are the rolling directions of the magnetic steel strip, and all directions parallel to the virtual lines 320a and 320b are easy magnetization directions of the magnetic steel strip.
[0059]
As described above, the two directions forming an angle of 45° with the rolling direction 310 are easy magnetization directions. The angle formed with the rolling direction 310 here is a positive value in both the direction from the X axis to the Y axis (counterclockwise direction toward the paper surface) and the direction from the Y axis to the X axis. is the angle of Also, the angle formed by the two directions is the smaller one of the angles.
[0060]
In the example shown in FIG. 3, the longitudinal direction of the three legs 210a to 210c formed by the E-shaped electromagnetic steel sheet 110 is aligned with one of the two easy magnetization directions 320a to 320b of the electromagnetic steel strip 320a. and the longitudinal directions of the yoke portions 220a to 220b formed by the E-shaped electromagnetic steel sheets 110 are aligned with the other of the two easy magnetization directions 320a to 320b of the electromagnetic steel strip. Next, regions 330a to 330b forming the E-shaped magnetic steel sheet 110 are cut out from the magnetic steel strip. In FIG. 3, the solid line indicates the cutout position. For example, due to manufacturing errors, the longitudinal direction of the legs 210a to 210c does not exactly match the easy magnetization direction 320a. The direction 320b may not strictly match. Therefore, the longitudinal direction of the leg portions 210a to 210c and the longitudinal direction of the yoke portions 220a to 220b do not coincide with the directions of easy magnetization 320a to 320b unless these two directions strictly coincide (for example, , deviated within ±5°). The same applies to the expression that the longitudinal direction of the legs, yokes, regions, etc., and the direction of easy magnetization match.
[0061]
In the example shown in FIG. 3, regions 330a to 330b forming two E-shaped magnetic steel plates 110 are electromagnetically arranged so that the tips of three leg portions 210a to 210c formed by two E-shaped magnetic steel plates 110 are aligned. Cut from steel strip. The cutout is realized by, for example, punching using a die, wire cutting, or the like.
In addition, when regions 330a and 330b forming two E-shaped magnetic steel sheets 110 are cut out from the magnetic steel strip so that the tips of the three legs 210a to 210c are aligned, two E-shaped magnetic steel sheets 110 are formed. I-shaped regions 340a-340b between the three legs 210a-210c are also cut out. The longitudinal direction of the I-shaped regions 340a-340b coincides with one of the two easy magnetization directions 320a-320b of the magnetic steel strip 320a. Therefore, in the present embodiment, the I-shaped magnetic steel sheet 120 is formed using the I-shaped regions 340a and 340b.
[0062]
Of the three legs 210a to 210c formed by the E-shaped magnetic steel sheet 110, the two legs 210a to 210b and 210b to 210c adjacent to each other (in the Y-axis direction) are spaced apart from each other by the I-shaped magnetic steel sheet 120. If the length in the width direction (Y-axis direction) is the same, processing for adjusting the length in the Y-axis direction of the I-shaped regions 340a and 340b is not required. In addition, the length in the longitudinal direction (X-axis direction) of the three legs 210a to 210c formed by the E-shaped magnetic steel plate 110 is the same as the length in the longitudinal direction (X-axis direction) of the I-shaped magnetic steel plate 120. In some cases, the longitudinal region of the I-shaped magnetic steel sheet 120 can be defined by cutting the I-shaped regions 340a to 340b at the central position in the longitudinal direction (X-axis direction).
As described above, by using the region between the three legs 210a to 210c formed by the E-shaped magnetic steel plate 110 as the I-shaped magnetic steel plate 120, the E-shaped region of the magnetic steel strip is A region that is neither the magnetic steel sheet 110 nor the I-shaped magnetic steel sheet 120 can be reduced.
[0063]
Of the three legs 210a to 210c formed by the E-shaped magnetic steel sheet 110, the two legs 210a to 210b and 210b to 210c adjacent to each other (in the Y-axis direction) are spaced apart from each other by the I-shaped magnetic steel sheet 120. The length in the width direction (Y-axis direction) and the length in the longitudinal direction (X-axis direction) of the three legs 210a to 210c formed by the E-shaped magnetic steel plate 110 are the same as the length in the I-shaped magnetic steel plate. 120 in the longitudinal direction (X-axis direction). In this case, regions 330a to 330b forming two E-shaped magnetic steel sheets 110 are cut out from the magnetic steel strip so that the tips of the three legs 210a to 210c are aligned with each other. By cutting the I-shaped regions 340a and 340b at the central position in the longitudinal direction (X-axis direction), two E-shaped magnetic steel sheets 110 and two I-shaped magnetic steel sheets 120 are formed. In this case, the area between the three legs 210a to 210c formed by the E-shaped magnetic steel sheet 110 can be utilized as the I-shaped magnetic steel sheet 120 without waste.
[0064]
FIG. 3 only shows how two E-shaped magnetic steel sheets 110 and two I-shaped magnetic steel sheets 120 are cut out. However, by continuously arranging the regions 330a to 330b shown in FIG. 3, a large number of E-shaped magnetic steel sheets 110 and I-shaped magnetic steel sheets 120 can be cut out from the magnetic steel strip. It should be noted that if the E-type magnetic steel sheet 110 and the I-type magnetic steel sheet 120 are cut through as shown in FIG. It is preferable because it can be done. However, it is not always necessary to cut out the E-shaped magnetic steel sheet 110 and the I-shaped magnetic steel sheet 120 as shown in FIG. For example, when an I-shaped magnetic steel plate protrudes from a region between two mutually adjacent leg portions 210a-210b and 210b-210c among the three leg portions 210a-210c formed by an E-shaped magnetic steel plate, I The electrical steel sheet of the mold is cut from another area of ​​the electrical steel strip.
[0065]
The (single) E-shaped magnetic steel sheet 110 and the (single) I-shaped magnetic steel sheet 120 obtained as described above are combined to form a Japanese character-shaped layer as a whole. Laminated core 100 is constructed by stacking them so that their contours match each other. At this time, the E-shaped magnetic steel plate 110 and the I-shaped magnetic steel plate 120 are combined so that the directions of the ends of the leg portions 210a to 210c constituting the E-shaped magnetic steel plate 110 are alternately opposite to each other by 180°. . In the example shown in FIGS. 1 and 2, in the odd-numbered layers from the top, the ends of the legs 210a to 210c formed by the E-shaped magnetic steel sheets 110 face the positive direction of the X axis, and the even-numbered layers from the top In the layer 2, the tips of the legs 210a to 210c formed by the E-shaped magnetic steel sheet 110 face the negative direction of the X axis.
In this way, one layer (single layer) obtained by combining one E-shaped magnetic steel sheet 110 and one I-shaped magnetic steel sheet 120 is the leg portions 210a to 210c of the E-shaped magnetic steel sheet 110. The layers may be laminated so that the directions in which the tips point are alternately opposite to each other by 180°. Unlike the multi-layer lamination method described below, this single-layer lamination method eliminates the need for a structure in which the magnetic steel sheets are laminated without changing their orientation, so that manufacturing equipment can be simplified. Furthermore, the above-described layer is a first laminate in which a plurality of layers are laminated such that the directions of the ends of the leg portions 210a to 210c of the E-type electromagnetic steel sheets 110 are aligned, and the above-described layer is an E-type electromagnetic A plurality of second laminates may be alternately laminated such that the directions of the ends of the legs 210a to 210c of the steel plate 110 are 180° opposite. Application of this multi-layer lamination method improves the efficiency of core fabrication.
[0066]
FIG. 4 is a diagram showing an example of the configuration of an electrical device that uses the laminated core 100. As shown in FIG. In this embodiment, an example in which the electric device 400 is a single-phase transformer will be described. 4 shows the longitudinal direction (Y-axis direction) and lamination direction (Z-axis direction) of the yoke portions 220a-220b of the laminated core 100 at the center of the longitudinal direction (X-axis direction) of the leg portions 210a-210c of the laminated core 100. ) shows a cross section of the laminated core 100 cut parallel to . In addition, in FIG. 4 , part of the configuration of the electrical device 400 is simplified or omitted for convenience of description and notation.
[0067]
In FIG. 4, an electrical device 400 has a laminated core 100, a primary coil 410, and a secondary coil 420.
An input voltage (excitation voltage) is applied across the primary coil 410 . An output voltage corresponding to the turns ratio between the primary coil 410 and the secondary coil 420 is output across the secondary coil 420 . The excitation frequency of the electric device 400 (the frequency of the excitation current flowing through the primary coil 410) may be the commercial frequency or a frequency higher than the commercial frequency (for example, a frequency in the range of 100 Hz or more and less than 10 kHz).
[0068]
The primary coil 410 is arranged so as to surround (the side surface of) the central leg 210b of the three legs 210a to 210c of the laminated core 100. As shown in FIG. Primary coil 410 is electrically insulated from laminated core 100 and secondary coil 420 . The secondary coil 420 is arranged outside the primary coil 410 so as to surround (the side surface of) the central leg of the three legs of the laminated core 100 . Secondary coil 420 is electrically insulated from laminated core 100 and primary coil 410 .
The sum of the thickness of the primary coil 410 and the thickness of the secondary coil 420 is the sum of the thicknesses of two mutually adjacent legs 210a to 210b and 210b to 210c among the three legs 210a to 210c of the laminated core 100 (in the Y-axis direction). ) interval.
[0069]
When configuring the electric device 400, first, the primary coil 410 and the secondary coil 420 are produced. Then, the primary coil 410 and the secondary coil 420 are arranged as shown in FIG. Specifically, the primary coil 410 and the secondary coil 420 are arranged so that the primary coil 410 is relatively inside and the secondary coil 420 is relatively outside so that the primary coil 410 and the secondary coil 420 are coaxial. .
[0070]
After that, the center leg 210b of the E-shaped electromagnetic steel sheet 110 is placed in the hollow of the primary coil 410 so that the directions of the ends of the legs 210a to 210c of the E-shaped electromagnetic steel sheet 110 are alternately opposite 180°. E-shaped magnetic steel sheets 110 are inserted into the parts one by one, and the E-shaped magnetic steel sheets 110 are inserted in the same layer so that the shape of the plate surface is a combination of E and I in the same layer.The I-type electrical steel sheet 120 is arranged at the tips of the constituent legs 210a to 210c. By arranging the E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 as described above, the primary coil 410 and the secondary coil 420 are arranged on the central leg of the E-type electrical steel sheet 110. The laminated core 100 in the state is configured. In this way, the electric wires constituting the primary coil 410 and the secondary coil 420 are wound around the two legs 210a to 210b, which are adjacent to each other among the three legs 210a to 210c of the laminated core 100, for each winding. It is not necessary to pass through the region between 210b and 210c. Therefore, the primary coil 410 and the secondary coil 420 can be easily configured.
[0071]
The laminated core 100 configured as described above is fixed by a known method. For example, the laminated core 100 is fixed by attaching a case in a state of being electrically insulated from the laminated core 100 so as to cover the side surface of the laminated core 100 (the surface where the thick portion of the electromagnetic steel sheet is exposed). be able to. Further, through holes penetrating in the stacking direction are formed at the four corners of the plate surface of the laminated core 100, and bolts are passed through the through holes in a state of being electrically insulated from the laminated core 100 to tighten the bolts. The laminated core 100 can be fixed. Alternatively, the laminated core 100 may be caulked to fix the laminated core 100. Further, the side surface of the laminated core 100 may be welded to fix the laminated core 100. Further, the electric device 400 may be impregnated with an insulating material such as varnish.
Further, as described in the section (Electromagnetic steel sheet used for laminated core), strain removal annealing is performed on the laminated core 100.
[0072]
As described above, in the present embodiment, the longitudinal direction (X-axis direction) of the three leg portions 210a to 210c formed by the E-type electrical steel sheet 110 and the joint iron portions 220a to 220b formed by the E-type electrical steel sheet 110. Two directions with the longitudinal direction (Y-axis direction) coincide with any of the easy magnetization directions 320a to 320b (in the example shown in FIGS. 1 to 3 the easy magnetization direction 320a or 320b), and the type I electromagnetic steel is applied. The longitudinal direction (Y-axis direction) of the joint iron portions 220a to 220b formed by the steel sheet 120 coincides with any of the easy magnetization directions 320a to 320b (in the example shown in FIGS. 1 to 3, the easy magnetization direction 320a). In addition, an E-type electrical steel sheet 110 and an I-type electrical steel sheet 120 are configured. The longitudinal direction of the legs 210a to 210c coincides with any of the easy magnetization directions 320a to 320b (the easy magnetization direction 320a in the examples shown in FIGS. 1 to 3), and the joint iron portions 220a to 220b. The E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 so that the longitudinal direction coincides with any of the easy-to-magnetize directions 320a to 320b (the easy-to-magnetize direction 320a or 320b in the examples shown in FIGS. 1 to 3). Are combined to form a laminated core 100. Therefore, it is possible to realize the laminated core 100 and the electric device 400 that effectively utilize the characteristics of the non-oriented electrical steel sheet described in the section (Electromagnetic steel sheet used for the laminated core).
[0073]
In the present embodiment, the E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 are arranged so that the directions of the tips of the legs 210a to 210c formed by the E-type electrical steel sheet 110 are alternately opposite to each other by 180 °. The case of combining the above was described as an example. In this way, the boundaries between the E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 can be prevented from lining up in the stacking direction. Therefore, it is preferable because it is possible to reduce iron loss and growl of the laminated core 100. However, it is not always necessary to do this. The E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 may be combined so that the tips of the E-type electrical steel sheet 110 face in the same direction. Also in this case, as described above, it is preferable that the distance between the E-type electrical steel sheet 110 and the I-type electrical steel sheet 120 arranged in the same layer is short, and the E-type electrical steel sheet arranged in the same layer is preferable. It is more preferable that the plate thickness portions at the tips of the three leg portions 210a to 210c formed by 110 are in contact with the plate thickness portions of the joint iron portions 220a to 220b formed by the I-type electromagnetic steel plate 120. However, in order to suppress the magnetic saturation of the laminated core, the thick portions of the tips of the three legs 210a to 210c formed by the E-type electrical steel sheets 110 arranged in the same layer and the I-type electrical steel sheets 120 are formed. A gap may be provided between the joint iron portions 220a to 220b and the plate thickness portion, or an insulating material may be arranged.
[0074]
Further, in the present embodiment, the case where the electric device 400 is a single-phase transformer has been described as an example. However, the electric device 400 is not limited to a single-phase transformer as long as it is an electric device having a laminated core 100 and a coil arranged so as to orbit the laminated core 100. For example, the electrical device 400 may be a single-phase current transformer, a single-phase transformer, a reactor, a choke core, or another inductor. Further, the power source for driving the electric device 400 is not limited to the single-phase power source, and may be, for example, a three-phase power source. In this case, in the above description, the single phase is replaced by the three phases. Further, the coil is provided individually for each phase. For example, a coil may be arranged so as to orbit each of the three legs 210a to 210c of the laminated core 100 to form an inner iron type electric device.
[0075]
(Second embodiment)
Next, the second embodiment will be described. In the first embodiment, the case where the laminated core is an EI core has been described as an example. On the other hand, in the present embodiment, the case where the laminated core is an EE core will be described as an example. As described above, the electromagnetic steel sheets constituting the laminated core are mainly different between the present embodiment and the first embodiment. Therefore, in the description of the present embodiment, detailed description of the same parts as those of the first embodiment will be omitted by adding the same reference numerals as those given in FIGS. 1 to 4.
[0076]
FIG. 5 is a diagram showing an example of the appearance configuration of the laminated core 500. FIG. 6 is a diagram showing an example of arrangement of electrical steel sheets in each layer of the laminated core 500.
In FIGS. 5 and 6, the laminated core 500 has a plurality of E-type electrical steel sheets 510.
The laminated core 500 has three legs 610a to 610c arranged with an interval in the Y-axis direction with the X-axis direction in the longitudinal direction and an interval in the X-axis direction with the Y-axis direction in the longitudinal direction. It has two joint iron portions 620a to 620b, which are arranged in the same direction. One of the two joint iron portions 620a to 620b is arranged at one end of the three leg portions 610a to 610c in the longitudinal direction (X-axis direction). The other of the two joint iron portions 620a to 620b is arranged at the other end of the three leg portions 610a to 610c in the longitudinal direction (X-axis direction). The three leg portions 610a to 610c and the two joint iron portions 620a to 620b are magnetically coupled. As shown in FIG. 6, the shape of the plate surface in the same layer of the laminated core 500 is generally a day shape in which two Es are combined.
[0077]
The E-type electrical steel sheet 510 has half of the regions of the three legs 610a to 610c of the laminated core 500 in the longitudinal direction (X-axis direction) of the legs and the two joint iron portions 620a to 620b of the laminated core 500. Consists of one of them. That is, the length in the longitudinal direction of the three legs 610a to 610c formed by the E-shaped electromagnetic steel plate 510 is half the length in the longitudinal direction of the three legs 610a to 610c of the laminated core 500. Further, as shown in FIGS. 5 and 6, there is a boundary between the three leg portions 610a to 610c formed by the E-type electrical steel sheet 510 and the joint iron portions 620a to 620b formed by the E-type electrical steel sheet 110. do not have.
[0078]
On the other hand, as shown in FIG. 5, there is a boundary at the positions of the tips of the three legs 610a to 610c formed by the E-type electrical steel sheet 510. That is, there is a boundary at the center position in the longitudinal direction (X-axis direction) of the legs 610a to 610c of the laminated core 500. It is preferable that the distance between the tips of the three legs 610a to 610c of the E-type electrical steel sheet 510 arranged in the same layer is short. It is more preferable that the thick portions at the tips of the three legs 610a to 610c formed by the E-type electrical steel sheets 510 arranged in the same layer are in contact with each other. However, in order to suppress the magnetic saturation of the laminated core 500, a gap may be provided between the thick portions at the tips of the three legs 610a to 610c formed by the E-shaped electromagnetic steel sheets 510 arranged in the same layer. Insulation material may be placed.
[0079]
The easy magnetization direction of the E-type electrical steel sheet 510 is the longitudinal direction (X-axis direction) of the three legs 610a to 610c formed by the E-type electrical steel sheet 510 and the joint iron portion formed by the E-type electrical steel sheet 110. It coincides with the two directions of 620a to 620b in the longitudinal direction (Y-axis direction).
[0080]
FIG. 7 is a diagram showing an example of a method of cutting out an E-shaped electromagnetic steel plate 510 from an electromagnetic steel strip.
In FIG. 7, the virtual line 710 shown by the alternate long and short dash line indicates the rolling direction of the electrical steel strip (hereinafter, also referred to as the rolling direction 710). The virtual lines 720a to 720b shown by the broken lines indicate the easy magnetization directions of the electrical steel strip (hereinafter, also referred to as easy magnetization directions 720a to 720b). In FIG. 7, all the directions parallel to the virtual line 710 are the rolling directions of the electromagnetic steel strips, and all the directions parallel to the virtual lines 720a to 720b are the directions in which the electromagnetic steel strips are easily magnetized. Further, in FIG. 7, for convenience of explanation, the legs 610a to 610c and the joint iron portions 620a to 620b corresponding to the cut out electromagnetic steel sheets are also shown.
[0081]
As described above, the two directions in which the angle formed with the rolling direction 710 is 45 ° are the easy magnetization directions.
In the example shown in FIG. 7, the longitudinal direction of the three legs 610a to 610c formed by the E-shaped electromagnetic steel plate 510 is set to the easy magnetization direction 720a of one of the two easy magnetization directions 720a to 720b of the electrical steel strip. So that the longitudinal directions of the joint iron portions 620a to 620b formed by the E-shaped electromagnetic steel plate 510 coincide with each other in the easy magnetization direction 720b of the two easy magnetization directions 720a to 720b of the electrical steel strip. In addition, regions 730a to 730e constituting the E-shaped electromagnetic steel plate 510 are cut out from the electrical steel strip. In FIG. 7, the solid line indicates the cutout position. For convenience of notation, in FIG. 7, a part of the regions 730d to 730e constituting the E-type electrical steel sheet 510 is not shown.
[0082]
In the example shown in FIG. 7, of the three legs formed by the E-type electrical steel sheet 510, between the two adjacent legs 610a to 610b and 610b to 610c, the E-type electrical steel sheet 510 is Areas 730a to 730e constituting the E-type electromagnetic steel plate 510 are made of electrical steel so that the legs located at one end of the three legs 610a to 610c formed by another E-type electromagnetic steel plate 510 are located. Cut out from the band.
As described above, the region between the three legs 610a to 610c formed by the E-type electrical steel sheet 510 is formed by the three legs formed by the E-type electrical steel sheet 510 different from the E-type electrical steel sheet 510. By using it as a leg portion at one end of the portions 610a to 610c, it is possible to reduce the region of the electrical steel strip that does not become the E-type electrical steel plate 510.
[0083]
Of the three legs 610a to 610c formed by the E-shaped electromagnetic steel plate 510, the two legs 610a to 610b and 610b to 610c adjacent to each other are spaced apart from each other (in the Y-axis direction) by the E-shaped electromagnetic steel plate 510. If the widths (lengths in the Y-axis direction) of the legs 610a and 610c that are not located in the center of the three legs 610a to 610c are the same, the three legs 610a formed by the E-shaped electromagnetic steel plate 510 Processing for adjusting the widths of the legs 610a and 610c, which are not located in the center of the 610c, becomes unnecessary. In this case, the region between the three legs 610a to 610c formed by the E-type electrical steel sheet 510 is the three legs 610a to 610c of the E-type electrical steel sheet 510 different from the E-type electrical steel sheet 510. It can be used as a leg at one end without waste.
[0084]
FIG. 7 shows only the appearance of cutting out five E-type electromagnetic steel sheets 510, but by arranging the regions 730a to 730e shown in FIG. 7 continuously, a large number of E-type electromagnetic steel sheets 510 can be made of electrical steel. Can be cut out from the obi. As shown in FIG. 7, the E-type electrical steel sheet 510 is cut out.
This is preferable because the area that does not become the E-type electrical steel sheet 510 can be reduced. However, it is not always necessary to cut out the E-type electrical steel sheet 510 as shown in FIG. For example, the legs 610a and 610c that are not located in the center of the three legs 610a to 610c formed of the E-type electrical steel sheet are adjacent to each other among the three legs 610a to 610c formed by the E-type electrical steel sheet. When protruding from the region between the two matching legs 610a to 610b and 610b to 610c, the two legs 610a to 610b and 610b that are adjacent to each other among the three legs 610a to 610c formed by the E-shaped electrical steel sheet The region between 610c is not used for the E-type electrical steel sheet other than the E-type electrical steel sheet.
[0085]
The two E-shaped electrical steel sheets 510 obtained as described above are combined so that the tips of the legs 610a to 610c of the electrical steel sheet 510 face each other to form a day-shaped layer as a whole. The laminated core 500 is formed by stacking the U-shaped contours so as to match each other.
[0086]
The electric device configured by using the laminated core 500 is realized by using the laminated core 500 of the present embodiment instead of the laminated core 100 of the electric device 400 of the first embodiment. However, in the present embodiment, when the laminated core 500 is configured, a plurality of Es are provided so that the length in the laminated direction (height direction, Z-axis direction) is the same as the length in the laminated direction of the laminated core 500. Two sets of electrical steel sheets 510 of the mold are prepared by stacking them so that their contours match each other. In the following description, the two sets of the plurality of E-type electrical steel sheets 510 stacked in this way will be referred to as an E-type electrical steel sheet group, if necessary.
[0087]
As described in the first embodiment, after arranging the primary coil 410 and the secondary coil 420 as shown in FIG. 4, the tips of the legs 610a to 610c of the two sets of E-type electrical steel sheet groups face. The central leg 610b of the E-shaped electrical steel sheet group is inserted into the hollow portion of the primary coil 410 so that the directions are opposite to each other by 180 °. By doing so, the shape of the plate surface in the same layer becomes a day shape in which two Es are combined.
Further, as described in the section (Electromagnetic steel sheet used for the laminated core), strain removal annealing is performed on the laminated core 500.
[0088]
As described above, in the present embodiment, the longitudinal direction (X-axis direction) of the three legs 610a to 610c formed by the E-type electrical steel sheet 510 and the joint iron portions 620a to 620b formed by the E-type electrical steel sheet 510 E-type so that the two directions with the longitudinal direction (Y-axis direction) coincide with any direction of the easy magnetization directions 720a to 720b (in the example shown in FIGS. 5 to 7, the easy magnetization direction 720a or 720b). Consists of the electromagnetic steel sheet 510 of. The longitudinal direction of the leg portions 610a to 610c coincides with any of the magnetization easy directions 720a to 720b (in the example shown in FIGS. 5 to 7, the magnetization easy direction 720a), and the joint iron portions 620a to 620b. The laminated core 500 is formed by combining E-type electrical steel sheets 510 so that the longitudinal direction coincides with any of the easy magnetization directions 720a to 720b (720b in the easy magnetization direction in the examples shown in FIGS. 5 to 7). .. Therefore, even if the laminated core is used as the EE core, the same effect as when the laminated core is used as the EI core can be obtained.
Also in this embodiment, various modified examples described in the first embodiment can be adopted.
[0089]
(Third Embodiment)
Next, the third embodiment will be described. In the first embodiment, the laminated core is the EI core, and in the second embodiment, the case where the laminated core is the EE core has been described as an example. On the other hand, in the present embodiment, a case where the laminated core is a UI core will be described as an example. As described above, the electromagnetic steel sheets constituting the laminated core are mainly different between the present embodiment and the first to second embodiments. Therefore, in the description of the present embodiment, the same parts as those of the first to second embodiments are designated by the same reference numerals as those given in FIGS. 1 to 7, and detailed description thereof will be omitted.
[0090]
FIG. 8 is a diagram showing an example of the appearance configuration of the laminated core 800. FIG. 9 is a diagram showing an example of arrangement of electrical steel sheets in each layer of the laminated core 800. FIG. 9A is a diagram showing an example of the arrangement of the odd-numbered electrical steel sheets from the top (counting from the positive direction side of the Z axis). FIG. 9B is a diagram showing an example of arrangement of even-numbered electrical steel sheets from the top. In FIG. 9, for convenience of explanation, the legs 810a to 810b and the joint iron portions 820a to 820b corresponding to the cut out electromagnetic steel sheets are also shown.
[0091]
In FIGS. 8 and 9, the laminated core 800 has a plurality of U-shaped electrical steel sheets 810 and a plurality of I-shaped electrical steel sheets 820.
The laminated core 800 has two legs 910a to 910b arranged with an interval in the Y-axis direction with the X-axis direction in the longitudinal direction, and two legs 910a to 910b arranged with an interval in the Y-axis direction, and has an interval in the X-axis direction with the Y-axis direction in the longitudinal direction. It has two joint iron portions 920a to 920b, which are arranged in the same direction. One of the two joint iron portions 920a to 920b is arranged at one end of the two leg portions 910a to 910b in the longitudinal direction (X-axis direction). The other of the two joint iron portions 920a to 920b is arranged at the other end of the two leg portions 910a to 910b in the longitudinal direction (X-axis direction). The two leg portions 910a to 910b and the two joint iron portions 920a to 920b are magnetically coupled. As shown in FIGS. 9 (a) and 9 (b), the shape of the plate surface in the same layer of the laminated core 800 is generally a mouth shape (rectangular shape) in which U and I are combined. Become.
[0092]
The U-shaped electromagnetic steel plate 810 constitutes one of the two leg portions 910a to 910b of the laminated core 800 and the two joint iron portions 920a to 920b of the laminated core 800. There is no boundary between the two leg portions 910a to 910b formed by the U-shaped electromagnetic steel plate 810 and the joint iron portions 920a to 920b formed by the U-shaped electromagnetic steel plate 810. The I-type electrical steel sheet 820 constitutes one of the two joint iron portions of the laminated core 800. There is a boundary between the joint iron portions 920a to 920b formed by the I-type electrical steel sheet 820 and the two leg portions 910a to 910b formed by the U-type electrical steel sheet 810.
The shorter the distance between the U-type electrical steel sheet 810 and the I-type electrical steel sheet 820 arranged in the same layer, the more preferable. What are the thickness portions at the tips of the two legs 910a to 910b formed by the U-shaped electromagnetic steel sheets 810 arranged in the same layer and the thickness portions of the joint iron portions 920a to 920b formed by the I-shaped electrical steel sheets 820? It is more preferable that they are in contact with each other.
[0093]
The easy magnetization directions of the U-shaped electrical steel sheet 810 are the longitudinal direction (X-axis direction) of the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 and the joint iron portion formed by the U-shaped electrical steel sheet 810. It coincides with the two directions of 920a to 920b in the longitudinal direction (Y-axis direction).
The easy magnetization direction of the I-type electrical steel sheet 820 coincides with the longitudinal direction (Y-axis direction) of the joint iron portions 920a to 920b formed by the I-type electrical steel sheet 820.
[0094]
FIG. 10 is a diagram showing an example of a method of cutting out a U-shaped electromagnetic steel plate 810 and an I-shaped electromagnetic steel plate 820 from an electromagnetic steel strip.
In FIG. 10, the virtual line 1010 shown by the alternate long and short dash line indicates the rolling direction of the electrical steel strip (hereinafter, also referred to as the rolling direction 1010). The virtual lines 1020a to 1020b shown by the broken lines indicate the easy magnetization directions of the electromagnetic steel strip (hereinafter, also referred to as easy magnetization directions 1020a to 1020b). In FIG. 10, all the directions parallel to the virtual line 1010 are the rolling directions of the electromagnetic steel strips, and all the directions parallel to the virtual lines 1020a to 1020b are the directions in which the electromagnetic steel strips are easily magnetized.
[0095]
As described above, the two directions in which the angle formed with the rolling direction 1010 is 45 ° are the easy magnetization directions.
In the example shown in FIG. 10, the longitudinal direction of the two legs 910a to 910b formed by the U-shaped electromagnetic steel plate 810 is set to the easy magnetization direction 1020a of one of the two easy magnetization directions 1020a to 1020b of the electrical steel strip. The longitudinal direction of the joint iron portions 920a to 920b formed by the U-shaped electromagnetic steel plate 810 coincides with that of the other easy magnetizing direction 1020b of the two easy magnetizing directions 1020a to 1020b of the electrical steel strip. In addition, the regions 1030a and 1030b constituting the U-shaped electromagnetic steel plate 810 are cut out from the electrical steel strip. In FIG. 10, the solid line indicates the cutout position.
[0096]
In the example shown in FIG. 10, the regions 1030a to 1030b constituting the two U-shaped electrical steel sheets 810 are electromagnetically arranged so that the tips of the two legs 910a to 910b formed by the two U-shaped electrical steel sheets 810 are aligned with each other. Cut out from the steel strip.
Further, when the regions 1030a to 1030b constituting the two U-shaped electromagnetic steel sheets 810 are cut out from the electromagnetic steel strip so that the tips of the two legs 910a to 910b are aligned with each other, the two U-shaped electromagnetic steel sheets 810 are formed. A type I region 1040 between the two legs 910a-910b is also cut out. The longitudinal direction of the I-shaped region 1040 coincides with the easy magnetization direction 1020a of one of the two easy magnetization directions 1020a to 1020b of the electrical steel strip. Therefore, in the present embodiment, the I-type electrical steel sheet 820 is formed by using the I-type region 1040.
[0097]
When the distance (in the Y-axis direction) between the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 is twice the length in the width direction (Y-axis direction) of the I-type electrical steel sheet 820. By cutting the I-shaped region 1040 at the center position in the width direction (Y-axis direction), the width direction region of the I-shaped electrical steel sheet 820 can be determined. Further, the length of the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 in the longitudinal direction (X-axis direction) is the same as the length of the I-type electrical steel sheet 820 in the longitudinal direction (X-axis direction). In some cases, the longitudinal region of the I-shaped electrical steel sheet 820 can be determined by cutting the I-shaped region 1040 at the central position in the longitudinal direction (X-axis direction).
As described above, by utilizing the region between the two legs 910a to 910b formed by the U-shaped electrical steel plate 810 as the I-type electrical steel plate 820, the U-shaped steel strip region of the region of the electrical steel strip is formed. It is possible to reduce the area where neither the electrical steel sheet 810 nor the I-type electrical steel sheet 820 is formed.
[0098]
The distance (in the Y-axis direction) between the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 is twice the length in the width direction (Y-axis direction) of the I-type electrical steel sheet 820, and , The length of the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 in the longitudinal direction (X-axis direction) is the same as the length of the I-shaped electrical steel sheet 820 in the longitudinal direction (X-axis direction). And. In this case, the regions 1030a to 1030b constituting the two U-shaped electromagnetic steel sheets 810 are cut out from the electrical steel strip so that the tips of the two legs 910a to 910b are aligned with each other, and between the two legs 910a to 910b. By cutting the I-shaped region 1040 into four at the center positions in the longitudinal direction (X-axis direction) and the width direction (Y-axis direction), two U-shaped electrical steel sheets 810 are formed, and the I-shaped electromagnetic steel sheet 810 is formed. Four steel sheets 820 are formed. In this case, the region between the two legs 910a to 910b formed by the U-shaped electrical steel sheet 810 can be used as the I-type electrical steel sheet 820 without waste.
[0099]
FIG. 10 shows only a state in which two U-shaped electrical steel sheets 810 are cut out and four I-type electrical steel sheets 820 are cut out. However, by arranging the regions 1030a to 1030b shown in FIG. 10 continuously, a large number of U-shaped electromagnetic steel sheets 810 and I-shaped electromagnetic steel sheets 820 can be cut out from the electrical steel strip. By cutting through the U-shaped electrical steel sheet 810 and the I-shaped electrical steel sheet 820 as shown in FIG. 10, it is possible to reduce the region that is neither the U-shaped electrical steel sheet 810 nor the I-type electrical steel sheet 820. It is preferable because it can be done. However, it is not always necessary to cut out the U-type electrical steel sheet 810 and the I-type electrical steel sheet 820 as shown in FIG. For example, when the I-type electromagnetic steel plate protrudes from the region between the two legs 910a to 910b formed by the U-type electrical steel plate, the I-type electrical steel plate is in a region different from the region of the electrical steel strip. Cut out from.
[0100]
(1 sheet) U-shaped electromagnetic steel sheet 810 and (1 sheet) obtained as described above The laminated core 800 is formed by stacking layers having a mouth shape as a whole in combination with an I-shaped electromagnetic steel plate 820 so that the contours of the mouth shape match each other. At this time, the U-shaped electrical steel sheet 810 and the I-shaped electrical steel sheet 820 are combined so that the directions of the tips of the legs 910a to 910b formed by the U-shaped electrical steel sheet 810 are alternately opposite to each other by 180 °. .. In the examples shown in FIGS. 8 and 9, in the odd-numbered layer from the top, the tips of the legs 910a to 910b formed by the U-shaped electrical steel sheet 810 face the positive direction side of the X-axis, and are even-numbered from the top. In the layer, the tips of the legs 910a to 910b formed by the U-shaped electrical steel sheet 810 face the negative direction side of the X-axis.
[0101]
FIG. 11 is a diagram showing an example of the configuration of an electric device configured by using the laminated core 800. In this embodiment as well as in the first embodiment, the case where the electric device 1100 is a single-phase transformer will be described as an example. FIG. 11 shows the longitudinal direction (Y-axis direction) and the stacking direction of the joint iron portions 920a to 920b formed by the laminated core 800 at the center of the leg portions 910a to 910b formed by the laminated core 800 in the longitudinal direction (X-axis direction). A cross section when the laminated core 800 is cut in parallel with (Z-axis direction) is shown. In FIG. 11, for convenience of description and notation, a part of the configuration of the electric device 1100 may be simplified or omitted.
[0102]
In FIG. 11, the electric device 1100 has a laminated core 800, primary coils 1110a to 1110b, and secondary coils 1120a to 1120b.
The primary coils 1110a to 1110b are connected in series or in parallel. An input voltage (excitation voltage) is applied to both ends of the primary coils 1110a to 1110b connected in series or in parallel. The secondary coils 1120a to 1120b are connected in series or in parallel. At both ends of the secondary coils 1120a to 1120b connected in series or in parallel, the turns ratio of the secondary coils 1120a to 1120b connected in series or in parallel with the primary coils 1110a to 1110b connected in series or in parallel was supported. The output voltage is output.
[0103]
The primary coil 1110a is arranged so as to orbit (the side surface) of one of the two legs 910a to 910b of the laminated core 800. The primary coil 1110a is electrically insulated from the laminated core 800 and the secondary coils 1120a and 1120b. The primary coil 1110b is arranged so as to orbit the other leg portion 910b (side surface) of the two leg portions 910a to 910b of the laminated core 800. The primary coil 1110b is electrically insulated from the laminated core 800 and the secondary coils 1120a and 1120b. The secondary coil 1120a is arranged outside the primary coil 1110a so as to orbit (the side surface) of one of the two legs 910a to 910b of the laminated core 800. The secondary coil 1120a is electrically insulated from the laminated core 800 and the primary coils 1110a and 1110b. The secondary coil 1120b is arranged outside the primary coil 1110b so as to orbit the other leg portion 910b (side surface) of the two leg portions 910a to 910b of the laminated core 800. The secondary coil 1120b is electrically insulated from the laminated core 800 and the primary coils 1110a and 1110b.
The total thickness of the primary coils 1110a to 1110b and the thicknesses of the secondary coils 1120a to 1120b is less than the distance (in the Y-axis direction) between the two legs of the laminated core 800.
[0104]
When configuring the electric device 1100, first, the primary coils 1110a to 1110b and the secondary coils 1120a to 1120b are manufactured. Then, as shown in FIG. 11, the primary coils 1110a to 1110b and the secondary coils 1120a to 1120b are arranged. Specifically, the primary coil 1110a and the secondary coil 1120a are arranged so that the primary coil 1110a and the secondary coil 1120a are coaxial with the primary coil 1110a relatively inside and the secondary coil 1120a relatively outside. .. Similarly, the primary coil 1110b and the secondary coil 1120b are arranged so that the primary coil 1110b and the secondary coil 1120b are coaxial with the primary coil 1110b relatively inside and the secondary coil 1120b relatively outside.
[0105]
After that, one or the other leg portion 910a to the other leg portion 910a to be formed of the U-shaped electromagnetic steel plate 810 is formed so that the directions of the tips of the leg portions 910a to 910b formed by the U-shaped electromagnetic steel plate 810 are alternately opposite to each other by 180 °. The 910b is sequentially inserted into the hollow portions of the primary coils 1110a and 1110b, respectively, and the U-shaped electromagnetic steel sheet 810 has a U-shaped electromagnetic steel sheet 810 so that the shape of the plate surface is the shape of a mouth that combines U and I in the same layer. The I-type electrical steel sheet 820 is arranged at the tips of the constituent legs 910a to 910b. By arranging the U-shaped electrical steel sheet 810 and the I-shaped electrical steel sheet 820 as described above, the primary coil 1110a and the secondary coil 1110a and the secondary coil 1110a and the secondary coil 1110a and the secondary coil 1110a and the secondary coil, respectively, are formed on one and the other legs of the U-shaped electrical steel sheet 810, respectively. A laminated core 800 is configured in which the coil 1120a, the primary coil 1110b, and the secondary coil 1120b are arranged. In this way, it is not necessary to pass the electric wires constituting the primary coils 1110a to 1110b and the secondary coils 1120a to 1120b through the region between the two legs 910a to 910b of the laminated core 800 for each winding. Therefore, the primary coils 1110a to 1110b and the secondary coils 1120a to 1120b can be easily configured.
The laminated core 800 can be fixed by a known method as described in the first embodiment. Further, as described in the section (Electromagnetic steel sheet used for the laminated core), strain removal annealing is performed on the laminated core 800.
[0106]
As described above, in the present embodiment, the longitudinal direction (X-axis direction) of the two leg portions 910a to 910b formed by the U-shaped electromagnetic steel sheet 810 and the joint iron portions 920a to 920b formed by the U-shaped electromagnetic steel sheet 810 are formed. Two directions with the longitudinal direction (Y-axis direction) coincide with any of the easy magnetization directions 1020a to 1020b (in the example shown in FIGS. 8 to 10 the easy magnetization direction 1020a or 1020b), and the type I electromagnetic steel is applied. The longitudinal direction (Y-axis direction) of the joint iron portions 920a to 920b formed by the steel plate 820 coincides with any direction of the easy magnetization directions 1020a to 1020b (in the example shown in FIGS. 8 to 10, the easy magnetization direction 1020a). In addition, a U-type electrical steel sheet 810 and an I-type electrical steel sheet 820 are formed. The longitudinal direction of the legs 910a to 910b coincides with any of the easy magnetization directions 1020a to 1020b (the easy magnetization direction 1020a in the examples shown in FIGS. 8 to 10), and the joint iron portions 920a to 920b. The U-shaped electromagnetic steel sheet 810 and the I-shaped electrical steel sheet 820 so that the longitudinal direction coincides with any of the easily magnetized directions 1020a to 1020b (in the example shown in FIGS. 8 to 10 the easy magnetization direction 1020a or 1020b). Are combined to form a laminated core 800. Therefore, even if the laminated core is used as the UI core, the same effect as when the laminated core is used as the EI core or the EE core can be obtained.
[0107]
In the present embodiment, the case where the coils (primary coils 1110a to 1110b and secondary coils 1120a to 1120b) are arranged in each of the two legs 910a to 910b of the laminated core 800 has been described as an example. However, it is not always necessary to do this. For example, of the two legs 910a to 910b of the laminated core 800, the coil may be arranged on one leg and the coil may not be arranged on the other leg. Further, the two laminated cores 800 may be used as an outer iron type electric device. In this case, the coils are arranged in the hollow portions of the two laminated cores 800.
In the present embodiment, the corners of the U-shaped electrical steel sheet 810 are at right angles (bent) and are not strictly U-shaped, but such a shape is also included in the U-shaped (the U-shaped). The U-shape also includes a shape in which the corners are curved (curved)).
Further, also in this embodiment, various modified examples described in the first to second embodiments can be adopted.
[0108]
The configuration of the laminated core is not limited to the EI core, the EE core, and the UI core described in the first to third embodiments. It has a plurality of legs and a plurality of joint iron portions, and at the same position in the stacking direction of the electromagnetic steel sheets, at least a part of the regions of the plurality of legs and at least a part of the regions of the plurality of joint iron portions. Any laminated core may be used as long as it is composed of the same (one) electromagnetic steel plate. That is, the laminated core is the same when at least a part of each of the leg portion and the joint iron portion extending orthogonally to each other at each position in the stacking direction is cut out from the same electromagnetic steel strip, for example. Any structure may be used as long as it is formed of an electromagnetic steel sheet that can be evaluated as having characteristics. Specifically, if the manufacturing conditions that can affect the characteristics of the electrical steel sheet, such as the rolling conditions and cooling conditions set for each equipment when manufacturing the electrical steel strips, are the same, the individual electrical steel strips are the same. It can be evaluated as having characteristics. That is, in each of the electromagnetic steel sheets, at least a part of the regions of the plurality of legs and at least a part of the regions of the plurality of joint iron portions are formed at the same position (each position) in the stacking direction of the electrical steel sheets in the laminated core. , Manufactured under the same manufacturing conditions. In this magnetic steel sheet, the magnetic property is obtained by aligning either the extension direction of the leg portion or the extension direction of the joint iron portion with one of the two directions in which the magnetic steel sheet has the best magnetic characteristics. An improved laminated core is manufactured.
[0109]
However, the plurality of joint iron portions are arranged with the direction perpendicular to the extension direction of the legs as the extension direction so that a closed magnetic path is formed in the laminated core when the laminated core is excited. Further, the electromagnetic steel sheets are laminated so that the plate surfaces face each other. In such a laminated core, a region composed of the same electromagnetic steel plate at the same position in the stacking direction of the electromagnetic steel plate (at least a part of the leg portion and at least a part of the joint iron portion). There is no boundary between), and the area is a continuous area. Further, the direction in which the main magnetic flux flows inside the laminated core when the laminated core is excited includes the extending direction of the leg portion and the extending direction of the joint iron portion.
[0110]
For example, in the first to third embodiments, two electromagnetic steel sheets (E-type electrical steel sheet 110, I-type electrical steel sheet 120, E-type electrical steel sheet 510, etc.) are used in the same layer (positions in which the stacking directions are the same). The surfaces of the E-type electrical steel sheet 510, the U-type electrical steel sheet 810, and the I-type electrical steel sheet 820) facing each other are oriented in the longitudinal direction of the leg formed by at least one of the two electrical steel sheets. The case where the plane is in the vertical direction (YZ plane) has been described as an example. However, in the same layer, if the surfaces of the two electrical steel sheets facing each other are parallel to each other, the surfaces of the two electrical steel sheets are not necessarily the longitudinal directions of the legs formed by at least one of the two electrical steel sheets. It does not have to be a plane in a direction perpendicular to (YZ plane), and may be a plane in a direction inclined with respect to the direction (for example, in FIG. 2, E-type electrical steel sheets 110 and I-type. The boundary line of the electrical steel sheet 120 may be inclined with respect to the Y axis).
[0111]
Further, in the second embodiment, the case where the EE core is configured by using two sets of E-type electrical steel sheets having the same shape and size has been described as an example. However, the lengths of the legs of the two sets of E-type electrical steel sheets may be different.
[0112]
Further, the laminated core may be a UU core. In this case, for example, two sets of U-shaped electromagnetic steel sheets in which a plurality of U-shaped electrical steel sheets 810 are stacked so that their contours match each other are prepared, and the direction in which the tips of the legs of the two sets of electrical steel sheets face is oriented. Two sets of electrical steel sheets are arranged so as to be 180 ° opposite to each other. Further, when the laminated core is used as the UI core, the lengths of the legs of the two sets of electromagnetic steel sheets may be different as in the case where the EE core is described.
[0113]
Further, in the first to third embodiments, two electromagnetic steel sheets (E-type electrical steel sheet 110, I-type electrical steel sheet 120, and E-type electrical steel sheet) are used in the same layer (positions in which the stacking directions are the same). The case where the laminated cores 100, 500, and 800 are formed by combining the plate 510 / E-type electrical steel sheet 510 and the U-type electrical steel sheet 810 / I-type electrical steel sheet 820) has been described as an example. However, a laminated core may be formed by combining three electromagnetic steel sheets in the same layer.
[0114]
In this way, if a laminated core is formed by combining a plurality of electromagnetic steel sheets in the same layer, the coils (primary coil 410 / secondary coil 420, primary coil 1110a to 1110b / secondary coil 1120a) can be configured as described above. ~ 1120b) is preferable because it can be easily configured. However, it is not always necessary to do this. For example, as (one sheet) electrical steel sheets having a day-shaped or mouth-shaped plate surface, a plurality of electrical steel sheets of the same size and shape are prepared, and the plurality of electrical steel sheets are mutually contoured. The laminated core may be formed by stacking them so as to fit each other. In this case, at the same position in the stacking direction of the electromagnetic steel sheets, all the regions of the plurality of legs and the plurality of joint iron portions are composed of the same (one sheet) electromagnetic steel sheets.
[0115]
Alternatively, when the outer shape of the plate surface in the same layer of the laminated core is a square figure eight shape and the same layer is formed by a plurality of electromagnetic steel sheets, a plurality of layers forming the same layer. The electromagnetic steel sheet of the above may include an electromagnetic steel sheet having a shape other than the E-type electrical steel sheet and the I-type electrical steel sheet (for example, the same layer is formed by the U-type electrical steel sheet and the T-type electrical steel sheet. May be). Further, when the outer shape of the plate surface in the same layer of the laminated core is rectangular and the same layer is formed by a plurality of electrical steel sheets, the plurality of electrical steel sheets forming the same layer are formed. It may include an electromagnetic steel sheet having a shape other than the U-type electrical steel sheet and the I-type electrical steel sheet (for example, the same layer may be formed by two L-type electrical steel sheets). Further, when the same layer of the laminated core is formed by a plurality of electrical steel sheets, these plurality of electrical steel sheets do not necessarily have to be cut out from the same electrical steel strip. For example, a plurality of electromagnetic steel sheets cut out from electrical steel strips (electrical steel strips having different production lots) forming different coils may form the same layer. Further, in such a case, one electromagnetic steel sheet forming at least a part of each of the leg portion and the joint iron portion extending orthogonal to each other has been described in the above-mentioned section (Electromagnetic steel sheet used for laminated core). As long as it is a non-oriented electrical steel sheet, the other electrical steel sheet does not have to be the non-oriented electrical steel sheet described in the section (Electromagnetic steel sheet used for laminated core).
[0116]
(Example)
Next, an embodiment will be described. In this embodiment, a laminated core made of an EI core using an electromagnetic steel sheet described in the section (Electromagnetic steel sheet used for a laminated core) and a laminated core made of an EI core using a known non-oriented electrical steel sheet are used. Compared. Each electromagnetic steel sheet has a thickness of 0.25 mm. As a known non-oriented electrical steel sheet, a non-oriented electrical steel sheet having a W10 / 400 of 12.8 W / kg was used. W10 / 400 is an iron loss when the magnetic flux density is 1.0 T and the frequency is 400 Hz. Further, the known non-oriented electrical steel sheet has the best magnetic properties in the rolling direction, and the anisotropy of the magnetic properties is relatively small. In the following description, the known non-oriented electrical steel sheet will be referred to as material A, if necessary. Further, the electromagnetic steel sheet described in the section (Electromagnetic steel sheet used for the laminated core), and the electromagnetic steel sheet used for the laminated core of this embodiment is referred to as a material B, if necessary.
[0117]
FIG. 12 is a diagram showing an example of the relationship between the B50 ratio and the angle from the rolling direction. FIG. 13 is a diagram showing an example of the relationship between the W15 / 50 ratio and the angle from the rolling direction. Here, B50 is the magnetic flux density when excited with a magnetic field strength of 5000 A / m, and W15 / 50 is the iron loss when the magnetic flux density is 1.5 T and the frequency is 50 Hz. Here, the magnetic flux density and the iron loss were measured by the method described in JIS C 2556: 2015.
[0118]
Further, FIGS. 12 and 13 show standardized values ​​of measured values ​​(magnetic flux density or iron loss) for each angle from the rolling direction of each material. In standardization, the average value for each angle of the material A from the rolling direction was set to 1.000. The average value for each angle from the rolling direction of the material A is 0 °, 22.5 °, 45 °, 67.5 °, 90 °, 112.5 °, 135 °, and the angle formed by the rolling direction of the material A is 0 °, 22.5 °, 45 °, 67.5 °, 90 °, 112.5 °, 135 °. The average value of the measured values ​​at eight angles of 157.5 ° was used. As described above, the values ​​on the vertical axis of FIGS. 12 and 13 are relative values ​​(dimensionless quantities).
[0119]
As shown in FIG. 12, in the material B, the B50 ratio is the largest when the angle formed with the rolling direction is 45 °, and the B50 ratio becomes smaller as the angle formed with the rolling direction approaches 0 ° and 90 °.
On the other hand, in the material A, the B50 ratio becomes small when the angle formed with the rolling direction is around 45 ° to 90 °.
[0120]
As shown in FIG. 13, in the material B, the W15 / 50 ratio is the smallest when the angle formed with the rolling direction is 45 °, and the W15 / 50 ratio becomes smaller as the angle formed with the rolling direction approaches 0 ° and 90 °. growing.
On the other hand, in the material A, the W15 / 50 ratio is the smallest when the angle formed with the rolling direction is 0 °, and becomes large when the angle formed with the rolling direction is in the vicinity of 45 ° to 90 °.
As described above, the material B has the best magnetic characteristics in the direction (easy magnetization direction) at an angle of 45 ° with the rolling direction. On the other hand, the magnetic characteristics are the worst in the directions of 0 ° and 90 ° (the rolling direction and the direction orthogonal to the rolling direction) with the rolling direction.
It should be noted that four regions (that is, a region of 0 ° to 22.5 ° and a region of 22.5 ° to 45 °) from the rolling direction to the direction in which the smaller angle of the rolling direction is 90 °. , 45 ° to 67.5 °, 67.5 ° to 90 °) magnetic properties have a theoretically symmetrical relationship.
[0121]
For the E-type electrical steel sheet of material A, the longitudinal directions of the three legs formed by the E-type electrical steel sheet were made to coincide with the rolling direction. For the I-type electrical steel sheet of the material A, the longitudinal direction of the joint iron portion formed by the I-type electrical steel sheet was set to coincide with the rolling direction.
Regarding the E-type electrical steel sheet of the material B, as described in the first embodiment, the longitudinal direction of the three legs formed by the E-type electrical steel sheet and the joint iron portion formed by the E-type electrical steel sheet. The two directions with the longitudinal direction of the are aligned with one of the two easy-to-magnetize directions. As for the I-type electrical steel sheet of the material B, as described in the first embodiment, the longitudinal direction of the joint iron portion formed by the I-type electrical steel sheet is made to coincide with one of the two easy magnetization directions. ..
[0122]
Both the E-type and I-type electromagnetic steel sheets of material A and the E-type and I-type electromagnetic steel sheets of material B were cut out from the electrical steel strip by punching with a die. The shape and size of the E-type electrical steel sheet of the material A and the E-type electrical steel sheet of the material B are the same. The shape and size of the I-type electrical steel sheet of the material A and the I-type electrical steel sheet of the material B are the same.
[0123]
The E-type and I-type electromagnetic steel sheets of the material A were subjected to strain relief annealing on the laminated cores stacked as described in the first embodiment, and the primary coil was arranged on the central leg of the laminated cores. Similarly, the E-type and I-type electromagnetic steel sheets of the material B are subjected to strain relief annealing on the laminated cores stacked as described in the first embodiment, and the primary coil is arranged on the central leg of the laminated cores. did.
[0124]
The number of E-type and I-type electrical steel sheets that make up each laminated core is the same (the shape and size of each laminated core are the same). Further, the primary coil arranged in each laminated core is the same coil.
Excitation currents with the same frequency and effective value are passed through both ends of the primary coil placed in each laminated core (that is, each laminated core is excited under the same exciting conditions), and in the central leg of each laminated core. The magnetic flux density was measured and the iron loss was measured. In addition, the exciting current flowing through the primary coil was measured to derive the primary copper loss.
[0125]
As a result, the ratio of the primary copper loss when the laminated core of the material B was used to the primary copper loss when the laminated core of the material A was used was 0.92. The ratio of the iron loss of the laminated core of the material B to the iron loss of the laminated core of the material A was 0.81. As described above, in this embodiment, the primary copper loss could be reduced by 8% and the iron loss by 19%, respectively, as compared with the case where the material A was used by using the material B.
[0126]
It should be noted that the embodiments of the present invention described above are merely examples of embodiment of the present invention, and the technical scope of the present invention should not be construed in a limited manner by these. It is a thing. That is, the present invention can be implemented in various forms without departing from the technical idea or its main features.
Industrial applicability
[0127]
According to the present invention, the magnetic characteristics of the laminated core can be improved. Therefore, it has high industrial applicability.
Code description
[0128]
100,500,800: laminated core, 110,510: E-type electrical steel sheet, 120,820: I-type electrical steel sheet, 210a to 210c, 610a to 610c, 910a to 910b: legs, 220a to 220c, 620a to 620c, 920a to 920b: Electrical steel section, 310,710,1010: Rolling direction 320a to 320b, 720a to 720b, 1020a to 1020b: Easy magnetization direction, 400,1100: Electrical equipment, 410,1110a to 1110b: Primary coil, 420, 1120a to 1120b: Secondary coil
The scope of the claims
[Claim 1]
A laminated core having a plurality of electromagnetic steel sheets laminated so that the plate surfaces face each other.
Each of the plurality of electromagnetic steel sheets
With multiple legs
A plurality of joint iron portions arranged with a direction perpendicular to the extension direction of the leg portion as an extension direction so that a closed magnetic path is formed in the laminated core when the laminated core is excited. With
The stacking direction of the electromagnetic steel sheets forming the plurality of legs and the stacking direction of the electrical steel sheets forming the plurality of joint iron portions are the same.
The electromagnetic steel sheet is
By mass%
C: 0.0100% or less,
Si: 1.50% to 4.00%,
Sol. Al: 0.0001% to 1.0%,
S: 0.0100% or less,
N: 0.0100% or less,
One or more selected from the group consisting of Mn, Ni, Co, Pt, Pb, Cu, Au: 2.50% to 5.00% in total,
Sn: 0.000% to 0.400%,
Sb: 0.000% to 0.400%,
P: 0.000% to 0.400%, and
One or more selected from the group consisting of Mg, Ca, Sr, Ba, Ce, La, Nd, Pr, Zn, Cd: Containing 0.0000% to 0.0100% in total,
Mn content (mass%) is [Mn], Ni content (mass%) is [Ni], Co content (mass%) is [Co], Pt content (mass%) is [Pt], Pb content The amount (% by mass) is [Pb], the Cu content (% by mass) is [Cu], the Au content (% by mass) is [Au], the Si content (% by mass) is [Si], sol. The Al content (% by mass) was changed to [sol. When [Al] is set, the following formula (A) is satisfied, and
The balance has a chemical composition consisting of Fe and impurities,
B50 in the rolling direction is B50L, B50 in the direction of 90 ° with the rolling direction is B50C, and the smaller angle of the rolling direction is 45 ° in one of the two directions of B50. When B50 and B50 in the other direction are B50D1 and B50D2, respectively, the following equations (B) and (C) are satisfied, and the X-ray random intensity ratio of {100} <011> is 5 or more and less than 30. The plate thickness is 0.50 mm or less,
The electromagnetic steel sheet is arranged so that one of the two directions in which the magnetic steel sheet has the best magnetic characteristics is along either the extension direction of the leg portion or the extension direction of the joint iron portion. Has been
The laminated core is characterized in that the two directions having the best magnetic characteristics are the two directions in which the smaller angle of the rolling direction is 45 °.
([Mn] + [Ni] + [Co] + [Pt] + [Pb] + [Cu] + [Au])-([S i] + [sol. Al])> 0% ... (A)
(B50D1 + B50D2) / 2> 1.7T ... (B)
(B50D1 + B50D2) / 2> (B50L + B50C) / 2 ... (C)
[Claim 2]
The laminated core according to claim 1, wherein the laminated core satisfies the following equation (D).
(B50D1 + B50D2) / 2> 1.1 x (B50L + B50C) / 2 ... (D)
[Claim 3]
The laminated core according to claim 1, wherein the laminated core satisfies the following equation (E).
(B50D1 + B50D2) / 2> 1.2 x (B50L + B50C) / 2 ... (E)
[Claim 4]
The laminated core according to claim 1, wherein the laminated core satisfies the following equation (F).
(B50D1 + B50D2) / 2> 1.8T ... (F)
[Claim 5]
The laminated core according to claim 1, wherein the laminated core is an EI core, an EE core, a UI core, or a UU core.
[Claim 6]
An electric device having a laminated core according to any one of claims 1 to 5 and a coil arranged so as to orbit the laminated core.