Invention title: Laminated core and rotary electric machine
Technical field
[0001]
The present invention relates to a laminated core and a rotary electric machine.
The present application claims priority based on Japanese Patent Application No. 2018-235862 filed in Japan on December 17, 2018, the contents of which are incorporated herein by reference.
Background technology
[0002]
Conventionally, a laminated core as described in Patent Document 1 below has been known. In this laminated core, electromagnetic steel sheets adjacent to each other in the laminated direction are adhered by an adhesive layer.
Prior art literature
Patent documents
[0003]
Patent Document 1: Japanese Patent Application Laid-Open No. 2006-353001
Outline of the invention
Problems to be solved by the invention
[0004]
There is room for improvement in improving the magnetic properties of the conventional laminated core.
[0005]
The present invention has been made in view of the above circumstances, and an object of the present invention is to improve magnetic characteristics.
Means to solve problems
[0006]
In order to solve the above problems, the present invention proposes the following means.
(1) The first aspect of the present invention is a laminated core including a plurality of electromagnetic steel sheets laminated in the thickness direction, wherein the electromagnetic steel sheets have an annular core back portion and a radial direction from the core back portion. A plurality of teeth portions are provided so as to project toward the core back portion and are arranged at intervals in the circumferential direction of the core back portion, and a caulking portion is provided at a portion of the core back portion corresponding to the teeth portion. It is a laminated core in which an adhesive portion is provided on the teeth portion.
In general, the region of the core back portion that does not correspond to the teeth portion (the region between adjacent teeth portions) is the path of the magnetic flux. According to this configuration, by providing the caulking portion in the portion corresponding to the tooth portion in the core back portion, it becomes difficult to obstruct the magnetic circuit as compared with the case where the caulking portion is provided in the path of this magnetic flux. That is, in the portion of the core back portion corresponding to the teeth portion, the magnetic flux (magnetic circuit) generated in the teeth portion branches toward both sides along the circumferential direction. Therefore, the caulking portion provided in this portion is unlikely to affect the magnetic circuit. As a result, the iron loss generated in the stator core can be reduced, and the magnetic characteristics of the laminated core can be improved.
[0007]
(2) In the laminated core according to (1), the tooth portion has a first tooth portion provided with the adhesive portion and a second tooth portion without the adhesive portion. You may.
Generally, the adhesive shrinks as it cures. Therefore, when an adhesive is provided on the electrical steel sheet, compressive stress is applied to the electrical steel sheet as the adhesive cures. When compressive stress is applied, the magnetic steel sheet is distorted.
According to this configuration, the adhesive portion is provided in the first tooth portion, but is not provided in the second tooth portion. Therefore, distortion due to curing of the adhesive does not occur in the second tooth portion. Therefore, the strain generated in the entire laminated core can be made smaller.
[0008]
If all the tooth portions are adhesively fixed to each other, distortion will occur due to the adhesive provided on all the tooth portions. If all the teeth are distorted, there is a concern that the iron loss generated in the stator core will increase. Therefore, only a part of the teeth is adhesively fixed. As a result, the strain generated in the entire stator core can be further reduced.
[0009]
Further, in the first tooth portion provided with the adhesive portion, since the first tooth portion is adhered, the first tooth portion does not float. If a winding is wound around a floating tooth portion, the floating tooth portion is deformed by the winding, and stress is applied to the tooth portion by the winding. Therefore, a stress due to the winding is applied to the first tooth portion, and it is possible to suppress the influence of this stress on the magnetic field. However, a compressive stress is generated in the first tooth portion by the adhesive portion.
On the other hand, the compressive stress does not occur in the second tooth portion where the adhesive portion is not provided. However, since the second tooth portion is lifted, stress due to the winding is applied.
According to this configuration, the teeth portion has a first teeth portion and a second teeth portion. Therefore, the compressive stress and the stress due to the winding can be suppressed while being balanced. Therefore, it is possible to provide a high-performance laminated core having further improved magnetic characteristics.
[0010]
(3) In the laminated core according to the above (2), the first tooth portion and the second tooth portion may be alternately arranged in the circumferential direction.
According to this configuration, the first tooth portion to which the compressive stress is applied but the stress due to the winding is suppressed and the second tooth portion to which the compressive stress is not generated but the stress due to the winding is applied are alternately alternated. Deploy. Therefore, both stresses can be suppressed in a well-balanced manner.
[0011]
(4) In the laminated core according to (2) or (3), the caulking portion may be provided on the core back portion corresponding to the first tooth portion.
Generally, when a crimped portion is provided on an electromagnetic steel sheet, the electromagnetic steel sheet is deformed, so that the electromagnetic steel sheet is distorted.
If a caulking portion is provided in the core back portion corresponding to all the teeth portions, there is a concern that the iron loss generated in the laminated core will increase. Therefore, the caulking portion is provided only in the core back portion corresponding to the first tooth portion, which is a part of the teeth portion. As a result, the strain generated in the entire laminated core can be further reduced.
[0012]
(5) In the laminated core according to (2) or (3), the caulking portion may be provided on the core back portion corresponding to the second tooth portion.
If a caulking portion is provided in the core back portion corresponding to all the teeth portions, there is a concern that the iron loss generated in the laminated core will increase. Therefore, a caulking portion is provided only in the core back portion corresponding to the second tooth portion, which is a part of the teeth portion. As a result, the strain generated in the entire laminated core can be further reduced.
[0013]
(6) In the laminated core according to any one of (1) to (5) above, the average thickness of the bonded portion may be 1.0 μm to 3.0 μm.
[0014]
(7) In the laminated core according to any one of (1) to (6) above, the average tensile elastic modulus E of the bonded portion may be 1500 MPa to 4500 MPa.
[0015]
(8) In the laminated core according to any one of (1) to (7) above, the adhesive portion is a room temperature adhesive type acrylic adhesive containing SGA made of an elastomer-containing acrylic adhesive. May be good.
[0016]
(9) A second aspect of the present invention is a rotary electric machine including the laminated core according to any one of (1) to (8) above.
According to this configuration, the magnetic characteristics of the rotating electric machine can be improved.
The invention's effect
[0017]
According to the present invention, the magnetic characteristics can be improved.
A brief description of the drawing
[0018]
FIG. 1 is a cross-sectional view of a rotary electric machine according to an embodiment of the present invention.
FIG. 2 is a plan view of a stator included in the rotary electric machine shown in FIG.
FIG. 3 is a side view of the laminated core according to the first embodiment of the present invention.
FIG. 4 is a plan view of a first surface of an electromagnetic steel sheet in a laminated core according to the first embodiment of the present invention.
FIG. 5 is a plan view of a first surface of an electromagnetic steel sheet in a laminated core according to a second embodiment of the present invention.
FIG. 6 is a plan view of a first surface of an electromagnetic steel sheet in a laminated core according to a third embodiment of the present invention.
FIG. 7 is a plan view of a first surface of an electromagnetic steel sheet in a laminated core according to a fourth embodiment of the present invention.
FIG. 8 is a plan view of a first surface of an electromagnetic steel sheet in a laminated core of a comparative example.
FIG. 9 is a diagram showing relative values ​​of iron loss of laminated cores of Examples 1 to 4 when the iron loss of the laminated cores of Comparative Example is 1.
Mode for carrying out the invention
[0019]
Hereinafter, the rotary electric machine according to the embodiment of the present invention will be described with reference to the drawings. In this embodiment, an electric motor as a rotary electric machine, specifically, an AC electric motor will be described as an example. The AC motor is more specifically a synchronous motor, and more specifically a permanent magnet field type motor. This type of electric motor is suitably used for, for example, an electric vehicle.
[0020]
As shown in FIGS. 1 and 2, the rotary electric machine 10 includes a stator 20, a rotor 30, a case 50, and a rotary shaft 60. The stator 20 and rotor 30 are housed in a case 50. The stator 20 is fixed to the case 50.
In the present embodiment, as the rotary electric machine 10, an inner rotor type rotary electric machine in which the rotor 30 is located inside the stator 20 is used. However, as the rotary electric machine 10, an outer rotor type rotary electric machine in which the rotor 30 is located outside the stator 20 may be used. Further, in the present embodiment, the rotary electric machine 10 is a 12-pole 18-slot three-phase AC motor. However, for example, the number of poles, the number of slots, the number of phases, and the like can be changed as appropriate.
[0021]
The stator 20 includes a stator core 21 and a winding (not shown).
The stator core 21 includes an annular core back portion 22 and a plurality of teeth portions 23. The core back portion 22 is a region surrounded by the outer peripheral edge 22a of the core back portion and the inner peripheral edge 22b (broken line shown in FIG. 2) of the core back portion. Hereinafter, the axial direction of the stator core 21 (core back portion 22) (the central axis O direction of the stator core 21) is referred to as an axial direction. The radial direction of the stator core 21 (core back portion 22) (the direction orthogonal to the central axis O of the stator core 21) is referred to as the radial direction. The circumferential direction of the stator core 21 (core back portion 22) (direction that orbits around the central axis O of the stator core 21) is referred to as a circumferential direction.
[0022]
The core back portion 22 is formed in an annular shape in a plan view of the stator 20 when viewed from the axial direction.
For example, the teeth portion 23 has a rectangular shape in a plan view. The plurality of tooth portions 23 project from the core back portion 22 in the radial direction (toward the central axis O of the core back portion 22 along the radial direction). The plurality of tooth portions 23 are arranged at equal intervals in the circumferential direction. In the present embodiment, 18 tooth portions 23 are provided at every 20 degrees of the central angle centered on the central axis O. The plurality of tooth portions 23 are formed to have the same shape and the same size as each other.
The winding is wound around the teeth portion 23. The winding may be a centralized winding or a distributed winding.
[0023]
The rotor 30 is arranged inside the stator 20 (stator core 21) in the radial direction. The rotor 30 includes a rotor core 31 and a plurality of permanent magnets 32.
The rotor core 31 is formed in an annular shape (annular ring) arranged coaxially with the stator 20. The rotating shaft 60 is arranged in the rotor core 31. The rotating shaft 60 is fixed to the rotor core 31.
The plurality of permanent magnets 32 are fixed to the rotor core 31. In this embodiment, a set of two permanent magnets 32 form one magnetic pole. The plurality of sets of permanent magnets 32 are arranged at equal intervals in the circumferential direction. In the present embodiment, 12 sets (24 in total) of permanent magnets 32 are provided at every 30 degrees of the central angle centered on the central axis O.
[0024]
In this embodiment, an embedded magnet type motor is adopted as a permanent magnet field type motor.
The rotor core 31 is formed with a plurality of through holes 33 that penetrate the rotor core 31 in the axial direction. The plurality of through holes 33 are provided corresponding to the plurality of permanent magnets 32. Each permanent magnet 32 ​​is fixed to the rotor core 31 in a state of being arranged in the corresponding through hole 33. For example, each permanent magnet 32 ​​is fixed to the rotor core 31 by adhering the outer surface of the permanent magnet 32 ​​and the inner surface of the through hole 33 with an adhesive or the like. As the permanent magnet field type motor, a surface magnet type motor may be used instead of the embedded magnet type motor.
[0025]
Both the stator core 21 and the rotor core 31 are laminated cores. The laminated core is formed by laminating a plurality of electromagnetic steel sheets 40.
The product thickness of each of the stator core 21 and the rotor core 31 is, for example, 50.0 mm. The outer diameter of the stator core 21 is For example, it is set to 250.0 mm. The inner diameter of the stator core 21 is, for example, 165.0 mm. The outer diameter of the rotor core 31 is, for example, 163.0 mm. The inner diameter of the rotor core 31 is, for example, 30.0 mm. However, these values ​​are examples, and the product thickness, outer diameter and inner diameter of the stator core 21, and the product thickness, outer diameter and inner diameter of the rotor core 31 are not limited to these values. Here, the inner diameter of the stator core 21 is based on the tip of the teeth portion 23 of the stator core 21. The inner diameter of the stator core 21 is the diameter of a virtual circle inscribed in the tips of all the teeth portions 23.
[0026]
Each of the electromagnetic steel sheets 40 forming the stator core 21 and the rotor core 31 is formed, for example, by punching an electromagnetic steel sheet as a base material. As the electromagnetic steel sheet 40, a known electrical steel sheet can be used. The chemical composition of the electrical steel sheet 40 is not particularly limited. In this embodiment, a non-oriented electrical steel sheet is used as the electrical steel sheet 40. As the non-oriented electrical steel sheet, for example, a non-oriented electrical steel strip of JIS (Japanese Industrial Standards) C 2552: 2014 can be adopted.
However, as the electromagnetic steel sheet 40, it is also possible to use a grain-oriented electrical steel sheet instead of the non-oriented electrical steel sheet. For the grain-oriented electrical steel sheet, a JIS C 2553: 2012 grain-oriented electrical steel strip can be adopted.
[0027]
Insulating coatings are provided on both sides of the electrical steel sheet 40 in order to improve the workability of the electrical steel sheet and the iron loss of the laminated core. As the substance constituting the insulating film, for example, (1) an inorganic compound, (2) an organic resin, (3) a mixture of an inorganic compound and an organic resin, and the like can be applied. Examples of the inorganic compound include (1) a complex of dichromate and boric acid, and (2) a complex of phosphate and silica. Examples of the organic resin include epoxy-based resin, acrylic-based resin, acrylic-styrene-based resin, polyester-based resin, silicon-based resin, and fluorine-based resin.
[0028]
In order to ensure the insulating performance between the electromagnetic steel sheets 40 laminated with each other, the thickness of the insulating film (thickness per one side of the electromagnetic steel sheets 40) is preferably 0.1 μm or more.
On the other hand, as the insulating film becomes thicker, the insulating effect saturates. Further, as the insulating film becomes thicker, the space factor decreases, and the performance as a laminated core deteriorates. Therefore, the insulating coating should be as thin as possible to ensure the insulating performance. The thickness of the insulating film (thickness per one side of the electromagnetic steel sheet 40) is preferably 0.1 μm or more and 5 μm or less, and more preferably 0.1 μm or more and 2 μm or less.
[0029]
As the electromagnetic steel sheet 40 becomes thinner, the effect of improving iron loss gradually saturates. Further, as the electromagnetic steel sheet 40 becomes thinner, the manufacturing cost of the electrical steel sheet 40 increases. Therefore, the thickness of the electrical steel sheet 40 is preferably 0.10 mm or more in consideration of the effect of improving iron loss and the manufacturing cost.
On the other hand, if the electromagnetic steel sheet 40 is too thick, the press punching operation of the electrical steel sheet 40 becomes difficult.
Therefore, considering the press punching work of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.65 mm or less.
Further, as the electromagnetic steel sheet 40 becomes thicker, the iron loss increases. Therefore, considering the iron loss characteristics of the electrical steel sheet 40, the thickness of the electrical steel sheet 40 is preferably 0.35 mm or less. The thickness of the electromagnetic steel sheet 40 is more preferably 0.20 mm or 0.25 mm.
In consideration of the above points, the thickness of each electrical steel sheet 40 is, for example, 0.10 mm or more and 0.65 mm or less. The thickness of each electrical steel sheet 40 is preferably 0.10 mm or more and 0.35 mm or less, and more preferably 0.20 mm or 0.25 mm. The thickness of the electrical steel sheet 40 includes the thickness of the insulating coating.
[0030]
As shown in FIG. 3, the plurality of electromagnetic steel sheets 40 forming the stator core 21 are laminated in the thickness direction. The thickness direction is the thickness direction of the electromagnetic steel sheet 40. The thickness direction corresponds to the stacking direction of the electromagnetic steel sheets 40. The plurality of electromagnetic steel sheets 40 are arranged coaxially with respect to the central axis O. The electromagnetic steel sheet 40 includes a core back portion 22 and a plurality of teeth portions 23.
As shown in FIG. 4, the plurality of electromagnetic steel sheets 40 forming the stator core 21 are fixed to each other by the adhesive portion 41 and the caulking portion 25 provided on the surface (first surface) 40a of the electromagnetic steel sheet 40.
For example, although not shown, the caulking portion 25 is composed of convex portions (dowels) and concave portions formed on the electromagnetic steel plate 40. The convex portion protrudes from the electromagnetic steel sheet 40 in the stacking direction. The concave portion is arranged in a portion of the electromagnetic steel sheet 40 located on the back side of the convex portion. The recess is recessed in the stacking direction with respect to the surface of the electromagnetic steel sheet 40. The convex portion and the concave portion are formed by, for example, pressing the electromagnetic steel plate 40.
Of the pair of electrical steel sheets 40 overlapping in the stacking direction, the convex portion of the crimped portion 25 of one electrical steel sheet 40 fits into the concave portion of the crimped portion 25 of the other electrical steel sheet 40.
[0031]
As shown in FIG. 4, a caulking portion 25 is provided in a portion 24 of the core back portion 22 of the electrical steel sheet 40 corresponding to the teeth portion 23. The adhesive portion 41 is provided on the surface of the tooth portion 23 to be adhered (surface 23a shown in FIG. 4). The portion 24 of the core back portion 22 corresponding to the teeth portion 23 is sandwiched between a pair of reference lines extending outward in the radial direction on both side edges of the teeth portion 23 of the core back portion 22 in a plan view in the stacking direction. It is the part that is Each pair of reference lines extends along the radial direction. The fact that the caulking portion 25 is provided in the portion 24 of the core back portion 22 corresponding to the teeth portion 23 means that each caulking portion 25 is sandwiched between the pair of reference lines in the core back portion 22 as a whole. It means that it is provided so as to be located inside the part to be sewn. As described above, the tooth portion 23 is a portion that protrudes from the core back portion 22 in the radial direction. In FIG. 4, all the teeth portions 23 are provided with adhesive portions 41. The adhesive portion 41 is arranged at the central portion of the teeth portion 23.
[0032]
The caulking portion 25 and the adhesive portion 41 are arranged on a virtual coing line extending in the radial direction. The caulking portion 25 and the adhesive portion 41 are arranged at positions corresponding to the center of the teeth portion 23 along the circumferential direction. The caulking portion 25 is arranged at the center of the core back portion 22 in the radial direction.
The caulking portion 25 is preferably arranged in the vicinity of the outer peripheral edge of the core back portion 22. The term "near the outer peripheral edge of the core back portion 22" as used herein means a range of 30% of the radial length of the core back portion 22 from the radial outer end of the core back portion 22.
[0033]
As shown in FIG. 5, in the portion 24 of the core back portion 22 of the electrical steel sheet 40 corresponding to the teeth portion 23, a caulking portion 25 may be provided at every other tooth portion 23 in the circumferential direction.
[0034]
As shown in FIG. 6, the tooth portion 23 of the electrical steel sheet 40 has a first tooth portion 23A in which the adhesive portion 41 is provided and a second tooth portion 23B in which the adhesive portion 41 is not provided. May be good. Further, as shown in FIG. 6, the first teeth portion 23A and the second teeth portions 23B may be arranged alternately in the circumferential direction.
Further, as shown in FIG. 6, a core back portion corresponding to the first teeth portion 23A (a portion of the core back portion 22 located outside the first teeth portion 23A in the radial direction. Hereinafter, "the first core" A caulking portion 25 may be provided on the 24A. In this case, the first core back portion 24A may be provided with the entire caulking portion 25. In general, the region of the core back portion that does not correspond to the teeth portion is the path of the magnetic flux. By providing the entire caulking portion 25 in the first core back portion 24A, which is not the path of the magnetic flux, the caulking portion 25 can make it more difficult to obstruct the magnetic circuit.
Further, the caulking portion 25 may be provided at the outer peripheral edge of the first core back portion 24A or at the center in the circumferential direction of the first core back portion 24A.
[0035]
As shown in FIG. 7, the tooth portion 23 of the electrical steel sheet 40 has a first tooth portion 23A in which the adhesive portion 41 is provided and a second tooth portion 23B in which the adhesive portion 41 is not provided. May be good. Further, as shown in FIG. 7, the first teeth portion 23A and the second teeth portions 23B may be arranged alternately in the circumferential direction.
Further, as shown in FIG. 7, a caulking portion 25 may be provided on the core back portion (hereinafter, referred to as “second core back portion”) 24B corresponding to the second tooth portion 23B. In this case, the entire caulking portion 25 may be provided on the second core back portion 24B. By providing the entire caulking portion 25 in the second core back portion 24B, which is not the path of the magnetic flux, the caulking portion 25 can make it more difficult to obstruct the magnetic circuit.
Further, the caulking portion 25 may be provided at the outer peripheral edge of the second core back portion 24B or at the center in the circumferential direction of the second core back portion 24B.
[0036]
The plurality of bonding portions 41 bond the electromagnetic steel sheets 40 adjacent to each other in the stacking direction.
The adhesive portion 41 is an adhesive that is provided between the electromagnetic steel sheets 40 that are adjacent to each other in the stacking direction and is cured without being divided. As the adhesive, for example, a thermosetting adhesive by polymerization bonding is used.
As the composition of the adhesive, (1) an acrylic resin, (2) an epoxy resin, (3) a composition containing an acrylic resin and an epoxy resin, and the like can be applied.
[0037]
As the adhesive, in addition to a thermosetting type adhesive, a radical polymerization type adhesive or the like can also be used. From the viewpoint of productivity, a room temperature curing type (normal temperature adhesive type) adhesive is desirable. The room temperature curing type adhesive is an adhesive that cures at 20 ° C to 30 ° C. In the present specification, the numerical range represented by using "-" means a range including the numerical values ​​before and after "-" as the lower limit value and the upper limit value.
As the room temperature curing type adhesive, an acrylic adhesive is preferable. Typical acrylic adhesives include SGA (second generation acrylic adhesives, Second Generation Acrylic Adhesive) and the like. An anaerobic adhesive, an instant adhesive, and an elastomer-containing acrylic adhesive can be used as long as the effects of the present invention are not impaired.
The adhesive referred to here refers to the state before curing. When the adhesive is cured, it becomes an adhesive portion 41.
[0038]
The average tensile elastic modulus E of the bonded portion 41 at room temperature (20 ° C. to 30 ° C.) is in the range of 1500 MPa to 4500 MPa. If the average tensile elastic modulus E of the bonded portion 41 is less than 1500 MPa, there will be a problem that the rigidity of the laminated core is lowered. Therefore, the lower limit of the average tensile elastic modulus E of the adhesive portion 41 is 1500 MPa, more preferably 1800 MPa. On the contrary, if the average tensile elastic modulus E of the adhesive portion 41 exceeds 4500 MPa, a problem occurs in which the insulating film formed on the surface of the electromagnetic steel sheet 40 is peeled off. Therefore, the upper limit of the average tensile elastic modulus E of the adhesive portion 41 is 4500 MPa, more preferably 3650 MPa.
[0039]
The average tensile elastic modulus E is measured by the resonance method. Specifically, the tensile elastic modulus is measured in accordance with JIS R 1602: 1995.
More specifically, first, a sample for measurement (not shown) is produced. This sample is obtained by adhering two electromagnetic steel sheets 40 together with an adhesive to be measured and curing them to form an adhesive portion 41. When the adhesive is a thermosetting type, this curing is performed by heating and pressurizing under the heating and pressurizing conditions in actual operation. On the other hand, when the adhesive is a room temperature curing type, it is performed by pressurizing at room temperature.
Then, the tensile elastic modulus of this sample is measured by the resonance method. As described above, the method for measuring the tensile elastic modulus by the resonance method is performed in accordance with JIS R 1602: 1995. After that, the tensile elastic modulus of the bonded portion 41 alone can be obtained by removing the influence of the electromagnetic steel sheet 40 itself from the tensile elastic modulus (measured value) of the sample by calculation.
The tensile elastic modulus obtained from the sample in this way is the entire stator core 21 which is a laminated core. Is equal to the average value as. Therefore, this value is regarded as the average tensile elastic modulus E. The composition of the average tensile elastic modulus E is set so that it hardly changes at the stacking position along the stacking direction or at the circumferential position around the central axis of the stator core 21. Therefore, the average tensile elastic modulus E can be set to a value obtained by measuring the cured bonded portion 41 at the upper end position of the stator core 21.
[0040]
As a bonding method using a thermosetting adhesive, for example, a method of applying an adhesive to the electromagnetic steel plate 40 and then bonding by heating and / or pressure bonding can be adopted. As the heating means, for example, heating in a high-temperature tank or an electric furnace, or a method of directly energizing is used. The heating means may be any means.

The scope of the claims
[Claim 1]
A laminated core including a plurality of electrical steel sheets laminated in the thickness direction.
The electrical steel sheet includes an annular core back portion and a plurality of teeth portions that protrude in the radial direction from the core back portion and are arranged at intervals in the circumferential direction of the core back portion.
A caulking portion is provided in a portion of the core back portion corresponding to the teeth portion.
A laminated core in which an adhesive portion is provided on the teeth portion.
[Claim 2]
The laminated core according to claim 1, wherein the tooth portion has a first tooth portion provided with the adhesive portion and a second tooth portion without the adhesive portion.
[Claim 3]
The laminated core according to claim 2, wherein the first tooth portion and the second tooth portion are alternately arranged in the circumferential direction.
[Claim 4]
The laminated core according to claim 2 or 3, wherein the caulking portion is provided on the core back portion corresponding to the first teeth portion.
[Claim 5]
The laminated core according to claim 2 or 3, wherein the caulking portion is provided on the core back portion corresponding to the second tooth portion.
[Claim 6]
The laminated core according to any one of claims 1 to 5, wherein the average thickness of the bonded portion is 1.0 μm to 3.0 μm.
[Claim 7]
The laminated core according to any one of claims 1 to 6, wherein the average tensile elastic modulus E of the bonded portion is 1500 MPa to 4500 MPa.
[Claim 8]
The laminated core according to any one of claims 1 to 7, wherein the adhesive portion is a room temperature adhesive type acrylic adhesive containing SGA made of an elastomer-containing acrylic adhesive.
[Claim 9]
A rotary electric machine comprising the laminated core according to any one of claims 1 to 8.