Title of invention: Magnetic field generator and magnetic gear
Technical field
[0001]
The present disclosure relates to a magnetic field generator and a magnetic gear including the magnetic field generator.
Background technology
[0002]
As a type of gear device, a magnetic gear that uses the attractive and repulsive forces of magnets to transmit torque and motion without contact, thereby avoiding problems such as wear, vibration, and noise caused by tooth contact. There is Among these magnetic gears, the magnetic flux modulation type (harmonic type) magnetic gear has an inner peripheral magnetic field and an outer peripheral magnetic field arranged concentrically (coaxially), and between these two magnetic magnetic fields. a magnetic pole piece device having a plurality of magnetic pole pieces (pole pieces) and a plurality of non-magnetic bodies arranged alternately in the circumferential direction while providing a gap (air gap) between them. Then, the magnetic fluxes of the magnets of the two magnetic fields are modulated by the magnetic pole pieces to generate harmonic magnetic fluxes, and the two magnetic fields are synchronized with the harmonic magnetic fluxes. , the flux-modulated magnetic gear operates.
[0003]
In such a magnetic gear, in order to increase the torque density, it is effective to reduce leakage magnetic flux by adopting a Halbach magnet arrangement for these two magnetic fields. The Halbach magnet array includes a first magnet (radially magnetized magnet) having a magnetization direction orthogonal to the support surface and a second magnet having a magnetization direction parallel to the support surface on a support surface of a support member disposed opposite the gap. magnets (circumferentially magnetized magnets) alternately arranged along the support surface.
[0004]
In the Halbach magnet array, since magnets with different magnetization directions are placed next to each other, the operating point is lowered by the external demagnetizing field. In addition, thermal demagnetization, in which the coercive force of the magnet is reduced, may occur due to the heat generated by the coil, the increase in ambient temperature, and the like. Such thermal demagnetization increases the amount of demagnetization, further lowering the operating point lowered by the external demagnetizing field. On the other hand, in Patent Document 1, focusing on the fact that a magnetized magnet (circumferentially magnetized magnet) having a magnetization direction parallel to the support surface is susceptible to thermal demagnetization, a heavy magnet is placed in the vicinity of the gap of the magnetized magnet. It has been proposed to improve the coercive force (thermal demagnetization characteristics) by adding either Dy (dysprosium) or Tb (terbium) of rare earth elements.
prior art documents
patent literature
[0005]
Patent Document 1: Japanese Patent No. 5370912
SUMMARY OF THE INVENTION
Problems to be Solved by the Invention
[0006]
In Patent Document 1 above, the amount of demagnetization is suppressed by adding heavy rare earth elements Dy (dysprosium) and Tb (terbium) near the gap of the circumferentially magnetized magnet, which is likely to be thermally demagnetized. However, such heavy rare earths are expensive materials, resulting in high production costs.
[0007]
At least one embodiment of the present disclosure has been made in view of the above circumstances, and provides a low-cost magnetic field generator that can increase the magnetic field by suppressing the amount of demagnetization, and the magnetic field generator. It is an object of the present invention to provide a magnetic gear comprising:
Means to solve problems
[0008]
In order to solve the above problems, the magnetic field generator according to at least one embodiment of the present disclosure has
A magnetic field generating device comprising a plurality of magnets on a support member arranged facing a gap,
The plurality of magnets are
a first magnet having a magnetization direction orthogonal to the support surface of the support member;
a second magnet having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
One of the first magnet and the second magnet has a first dimension orthogonal to the support surface smaller than the other of the first magnet and the second magnet, and is formed in a concave shape when viewed from the gap side.
[0009]
In order to solve the above problems, the magnetic field generator according to at least one embodiment of the present disclosure has
A magnetic field generating device comprising a plurality of magnets on a support member arranged facing a gap,
The plurality of magnets are
a first magnet having a magnetization direction orthogonal to the support surface of the support member;
a second magnet having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
The second magnet has a second dimension parallel to the support surface that is larger than the first magnet.
Effect of the invention
[0010]
According to at least one embodiment of the present disclosure, it is possible to provide a low-cost magnetic field generator capable of increasing the magnetic field by suppressing the amount of demagnetization, and a magnetic gear including the magnetic field generator.
Brief description of the drawing
[0011]
1 is a schematic diagram of a cross section along the radial direction of a magnetic gear according to an embodiment of the present invention;
2 is an enlarged sectional view schematically showing a part of the cross section of the magnetic gear shown in FIG. 1; FIG.
3 is a schematic diagram of a cross section along the axial direction of the magnetic gear according to one embodiment of the present invention; FIG.
4 is a schematic diagram showing the magnetization direction of each magnet in the magnetic field generator of the outer magnet field of FIG. 2. FIG.
5 is a comparative example of FIG. 4. FIG.
6 is a verification result of the relationship between the dimension ratio of the first dimension of the second magnet to the first dimension of the first magnet in FIG. 4 and the demagnetization factor.
7 is a first modified example of FIG. 4; FIG.
8 is a second modification of FIG. 4; FIG.
9 is a third modified example of FIG. 4. FIG.
10 is a verification result of the relationship between the dimension ratio of the second dimension of the second magnet to the second dimension of the first magnet in FIG. 9 and the maximum transmission torque of the magnetic gear.
11 is a fourth modification of FIG. 4; FIG.
MODE FOR CARRYING OUT THE INVENTION
[0012]
Several embodiments of the present invention will be described below with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described as embodiments or shown in the drawings are not intended to limit the scope of the present invention, and are merely illustrative examples. do not have.
For example, expressions denoting relative or absolute arrangements such as "in a direction", "along a direction", "parallel", "perpendicular", "center", "concentric" or "coaxial" are strictly not only represents such an arrangement, but also represents a state of relative displacement with a tolerance or an angle or distance to the extent that the same function can be obtained.
For example, expressions such as "identical", "equal", and "homogeneous", which express that things are in the same state, not only express the state of being strictly equal, but also have tolerances or differences to the extent that the same function can be obtained. It shall also represent the existing state.
For example, expressions that express shapes such as squares and cylinders do not only represent shapes such as squares and cylinders in a geometrically strict sense, but also include irregularities and chamfers to the extent that the same effect can be obtained. The shape including the part etc. shall also be represented.
On the other hand, the expressions "comprising", "comprising", "having", "including", or "having" one component are not exclusive expressions that exclude the existence of other components.
[0013]
(Configuration of magnetic gear 9)
FIG. 1 is a schematic diagram of a cross section along the radial direction c of the magnetic gear 9 according to one embodiment of the present invention. FIG. 2 is an enlarged sectional view schematically showing a part of the cross section of the magnetic gear 9 shown in FIG. FIG. 3 is a schematic diagram of a cross section along the axial direction b of the magnetic gear 9 according to one embodiment of the present invention.
[0014]
The magnetic gear 9 is a device that has a mechanism that uses the attractive force and repulsive force of a magnet to transmit torque without contact. The magnetic gear 9 shown in FIGS. 1 to 3 is of a magnetic flux modulation type (harmonic type), and as shown, the outer diameter side magnet field 5 having a cylindrical (annular shape, the same applies hereinafter) shape as a whole. (outer rotor), an inner diameter magnet field 7 (inner rotor) having a generally cylindrical or columnar shape, and a magnetic pole piece device 10 (center rotor) having a generally cylindrical shape are coaxially arranged. , are arranged with a constant gap G (air gap) in the radial direction c (radial direction). That is, the outer magnet field 5 is arranged radially outward (outer diameter side) with respect to the inner magnet field 7 . Also, the pole piece device 10 is arranged between the outer magnet field 5 and the inner magnet field 7 . These outer magnet field 5, inner magnet field 7 and pole piece device 10 are arranged concentrically.
[0015]
In addition, as shown in FIG. 2, the outer diameter side magnet field 5 and the inner diameter side magnet field 7 are measured in the circumferential direction in a cross section cut along the radial direction c of the magnetic gear 9 (hereinafter referred to as a radial cross section). It comprises a magnetic field generator 1 having a plurality of magnets 2 arranged along a. The detailed structure of the magnetic field generator 1 will be described later. 11a and constitute a Halbach magnet array. The magnetic field 5 on the outer diameter side and the magnetic field 7 on the inner diameter side constitute a magnetic circuit by providing such a magnetic field generator 1 .
[0016]
The magnetic pole piece device 10 has a plurality of magnetic pole pieces 41 (pole pieces) arranged at intervals (even intervals) over the entire circumference in the circumferential direction a. Then, for example, when the inner diameter side magnet field 7 is rotated, the magnetic flux of the inner diameter side magnet field 7 is modulated by the magnetic pole piece 41 of the pole piece device 10, and the modulated magnetic field and the outer diameter side magnet field 5 act to Rotational torque is generated in the pole piece device 10 . Non-magnetic bodies 42 are alternately arranged between adjacent magnetic pole pieces 41 .
[0017]
In the embodiment shown in FIGS. 1 to 3, a magnetic geared motor integrated with a motor is shown as an example of the magnetic gear 9 (flux modulation type magnetic gear). More specifically, in this magnetic geared motor, the outer magnet field 5 is a stator provided with a plurality of coils 6 (see FIG. 2). By rotating the field 7 (high-speed rotor), according to the reduction ratio determined by the ratio of the number of pole pairs of the magnets 2 possessed by the outer magnet field 5 to the number of pole pairs of the magnets 2 possessed by the inner magnet field 7, the magnetic poles A piece device 10 (low speed rotor) is adapted to rotate.
[0018]
In addition, a cooling medium D such as air or water is supplied to the magnetic geared motor in order to protect the above components from heat generated during operation. Specifically, as shown in FIG. 3, cylindrical gaps are formed between the inner diameter magnet field 7 and the pole piece device 10 and between the outer diameter magnet field 5 and the pole piece device 10, respectively. G are formed, and the cooling medium D is configured to be supplied to these cylindrical gaps G so as to flow from one end side to the other end side. Also, the cooling medium D is similarly supplied to the gap formed between the outer magnet field 5 and the housing H located on the outer peripheral side thereof.
A gas such as air may be supplied to the gap between the outer magnet field 5 and the housing H, or, for example, a water-cooled pipe may be installed, and cooling water or the like may flow through the water-cooled pipe. You may let
[0019]
(Configuration of magnetic field generator 1)
The magnetic field generator 1 will be described in detail below. FIG. 4 is a schematic diagram showing the magnetization direction of each magnet 2 in the magnetic field generator 1 of the outer magnet field 5 of FIG. In FIG. 4, it is assumed that the size of the magnetic gear 9 along the radial direction c is sufficiently large, and that the support surface 4a of the support member 4 on which each magnet 2 is arranged is planar (linear in cross section). showing. In the following description, the magnetic field generator 1 possessed by the outer magnet field 5 will be described, but the same applies to the magnetic field generator 1 possessed by the inner magnet field 7 unless otherwise specified.
[0020]
The magnetic field generator 1 includes a first magnet 2a having a magnetization direction perpendicular to the support surface 4a and a second magnet 2b having a magnetization direction parallel to the support surface 4a. The first magnets 2a and the second magnets 2b are alternately arranged along the circumferential direction a to form a Halbach magnet array. The first magnet 2a has a substantially rectangular cross section with a first dimension L1a (along the radial direction c) perpendicular to the support surface 4a and a second dimension L2a (along the circumferential direction a) parallel to the support surface 4a. have. The second magnet 2b has a substantially rectangular cross section with a first dimension L1b (along the radial direction c) orthogonal to the support surface 4a and a second dimension L2b (along the circumferential direction a) parallel to the support surface 4a. have.
[0021]
Here, FIG. 5 is a comparative example of FIG. In this comparative example, the first magnet 2a and the second magnet It differs from FIG. 4 in that the stones 2b have cross-sectional shapes with the same dimensions. That is, in the comparative example, the first dimension L1a and the second dimension L2a of the first magnet 2a are equal to the first dimension L1b and the second dimension L2b of the second magnet 2b. In such a Halbach magnet arrangement, since magnets with different magnetization directions are arranged adjacent to each other, the external demagnetizing field B lowers the operating point. In addition, thermal demagnetization, in which the coercive force of the magnet 2 decreases, may occur due to heat generation of the coil 6 (see FIG. 2), an increase in ambient temperature, and the like. Such thermal demagnetization increases the amount of demagnetization and causes the operating point lowered by the external demagnetizing field B to be further lowered.
[0022]
In order to solve such a problem, one of the first magnet 2a and the second magnet 2b has a smaller first dimension perpendicular to the support surface 4a than the other of the first magnet 2a and the second magnet 2b, and the gap G side It is formed in a concave shape when viewed from above. In the embodiment shown in FIG. 4, the first dimension L1b of the second magnet 2b is designed to be smaller than the first dimension L1a of the first magnet 2a. It is provided concavely with respect to the first magnet 2a (in other words, the first magnet 2a is provided convexly with respect to the second magnet 2b). As a result, compared to the comparative example of FIG. 5, the number of magnet parts with low operating points can be reduced.
[0023]
FIG. 6 shows the verification result of the relationship between the dimension ratio R1 (=L1b/L1a) of the first dimension L1b of the second magnet 2b to the first dimension L1a of the first magnet 2a in FIG. 4 and the demagnetization rate. According to this verification result, as the dimension ratio R1 increases (as the first dimension L1b of the second magnet 2b becomes larger than the first dimension L1a of the first magnet 2a), the demagnetization rate increases, and the external demagnetizing field B shown to grow. On the other hand, when the dimension ratio R1 becomes smaller (as the first dimension L1b of the second magnet 2b becomes smaller than the first dimension L1a of the first magnet 2a), the demagnetization factor decreases and the external demagnetizing field B becomes smaller. was done. As described above, by designing the first dimension L1b of the second magnet 2b to be smaller than the first dimension L1a of the first magnet 2a, the external demagnetizing field B is suppressed, and a magnetic field with high magnetic force is generated. The device 1 can be realized.
[0024]
Further, when viewed from the gap G, the second magnet 2b is provided in a concave shape with respect to the first magnet 2a, so that the contact area of ​​the magnet 2 with the cooling medium D (see FIG. 3) flowing through the gap G can be increased. can. As a result, thermal demagnetization, in which the coercive force of the magnet 2 decreases due to the heat generated by the coil 6 (see FIG. 2) and the increase in ambient temperature, can be suppressed, and the amount of demagnetization can be reduced more effectively.
[0025]
Also, the first magnet 2a and the second magnet 2b are arranged so as to be in contact with the support surface 4a. Thereby, both the first magnet 2a and the second magnet 2b can be fixed on the supporting surface 4a with good strength, and excellent structural stability and rigidity can be obtained.
[0026]
FIG. 7 is a first modified example of FIG. In a first variant, the first magnet 2a is arranged such that the surface opposite the gap G is in contact with the support surface 4a, while the second magnet 2b is arranged such that the surface opposite the gap G is the support surface 4a. placed away from By disposing the second magnet 2b away from the gap G in this manner, a space S is formed between the second magnet 2b and the support surface 4a, increasing the contact area with the surroundings. As a result, the cooling performance is improved, and thermal demagnetization in which the coercive force of the magnet 2 is reduced due to heat generation of the coil 6 and an increase in ambient temperature can be suppressed more effectively. In this case, the second magnet 2b can feed cooling seals from both the gap G on the radially outer side and the space S on the radially inner side. It has a large heat transfer area and can provide excellent cooling performance.
[0027]
The magnetic field generator 1 of the first modified example may include a cooling medium supply section 50 for supplying the cooling medium D to the space S, as shown in FIG. The cooling medium supply unit 50 is configured to be able to supply the cooling medium D to each space S. As shown in FIG. In FIG. 7, the cooling medium supply unit 50 has a flow path capable of supplying the cooling medium D to each space S in parallel, but it may be a flow path capable of supplying the cooling medium D in series. A valve for switching the amount of supply of the cooling medium D and the flow path may be arranged on the flow path. The cooling medium D is, for example, the cooling medium D supplied to the gap G as described above with reference to FIG. Another cooling medium may be used. In the first modification, the cooling performance in the space S can be further improved by providing the cooling medium supply unit 50 as described above. Demagnetization can be suppressed and the amount of demagnetization can be reduced more effectively.
[0028]
FIG. 8 is a second modified example of FIG. In the second modification, contrary to the embodiment shown in FIG. 4, the first dimension L1a of the first magnet 2a is designed to be smaller than the first dimension L1b of the second magnet 2b. When viewed from above, the first magnet 2a is provided concavely with respect to the second magnet 2b (in other words, the second magnet 2b is provided convexly with respect to the first magnet 2a). In this case, the operating point can be raised by increasing the volume of the second magnet 2b, although a portion with a strong external demagnetizing field remains.
[0029]
FIG. 9 is a third modified example of FIG. In the third modification, the second dimension L2b of the second magnet 2b is designed to be larger than the second dimension L2a of the first magnet 2a (the first dimension L1b of the second magnet 2b is equal to the first dimension L1a of the first magnet 2a).
[0030]
Here, FIG. 10 shows the relationship between the dimension ratio R2 (=L2b/L2a) of the second dimension L2b of the second magnet 2b to the second dimension L2a of the first magnet 2a in FIG. 9 and the maximum transmission torque of the magnetic gear 9. This is the verification result. According to this verification result, as the dimension ratio R2 increases (as the second dimension L2b of the second magnet 2b becomes greater than the second dimension L2a of the first magnet 2a), the maximum transmission torque of the magnetic gear 9 increases. After showing a peak, a decreasing trend was confirmed. It was also confirmed that the maximum transmission torque reaches its maximum value when the dimensional ratio R2 is about 1.5. Accordingly, by designing the second dimension L2a of the first magnet 2a and the second dimension L2b of the second magnet 2b so that the dimension ratio R2 is about 1.5, the second dimension L2b of the second magnet 2b is By increasing the dimension L2b, the operating point of the magnet is improved and the magnetic flux density is increased, so that the maximum transmission torque can be increased more effectively.
[0031]
FIG. 11 is a fourth modified example of FIG. In the fourth modification, the first dimension L1b of the second magnet 2b is smaller than the first dimension L1a of the first magnet 2a, and the second dimension L2b of the second magnet 2b is smaller than the second dimension L2a of the first magnet 2a. Designed to grow. 4 and 7 to 8, the second magnet 2b is smaller than the first magnet 2a in terms of the first dimension L1, and the second dimension L2 is the same as in the embodiment illustrated in FIG. The second magnet 2b is designed to be larger than the first magnet 2a (preferably so that the dimensional ratio R1 is about 1.5). As a result, the external demagnetizing field B can be reduced more effectively and the maximum transmission torque can be increased as compared with the comparative example of FIG.
[0032]
As described above, according to the above-described embodiments, the magnetic field generator 1 capable of increasing the magnetic field by suppressing the amount of demagnetization at low cost, and the magnetic gear 9 including the magnetic field generator 1 can be provided.
[0033]
In addition, it is possible to appropriately replace the components in the above-described embodiments with well-known components within the scope of the present disclosure, and the above-described embodiments may be combined as appropriate.
[0034]
The contents described in each of the above embodiments can be understood, for example, as follows.
[0035]
(1) A magnetic field generator according to one aspect includes:
A magnetic field generator (for example, a The magnetic field generator 1) of the above embodiment,
The plurality of magnets are
a first magnet (for example, the first magnet 2a in the above embodiment) having a magnetization direction orthogonal to the support surface of the support member;
a second magnet (for example, the second magnet 2b in the above embodiment) having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
One of the first magnet and the second magnet has a first dimension orthogonal to the support surface smaller than the other of the first magnet and the second magnet, and is formed in a concave shape when viewed from the gap side.
[0036]
According to the aspect (1) above, the first magnet and the second magnet that constitute the Halbach magnet array are provided. One of the first magnet or the second magnet is formed smaller than the other in a first dimension orthogonal to the support surface. Thereby, the external demagnetizing field can be suppressed. Further, since the first dimension of the first magnet and the second magnet are different, unevenness is formed on the surface extending over the plurality of magnets when viewed from the gap side. This increases the contact area with the gap and improves the cooling performance of the plurality of magnets, thereby suppressing thermal demagnetization in which the coercive force of the magnets decreases due to the heat generation of the coils and the rise in ambient temperature. As a result, the amount of demagnetization in the Halbach magnet arrangement can be reduced without using particularly expensive materials, and a magnetic field generator with a high magnetic field can be realized.
[0037]
(2) A magnetic field generator according to one aspect,
A magnetic field generator (for example, a The magnetic field generator 1) of the above embodiment,
The plurality of magnets are
a first magnet (for example, the first magnet 2a in the above embodiment) having a magnetization direction orthogonal to the support surface of the support member;
a second magnet (for example, the second magnet 2b in the above embodiment) having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
The second magnet has a second dimension parallel to the support surface that is larger than the first magnet.
[0038]
According to the aspect (2) above, the first magnet and the second magnet that constitute the Halbach magnet array are provided. The second magnet has a first dimension larger than that of the first magnet in the direction parallel to the yoke-facing surface. By increasing the volume of the second magnet in this way, the maximum transmission torque in the magnetic gear can be effectively improved when the magnetic field generator is applied to the magnetic gear.
[0039]
(3) In another aspect, in the above (1) or (2) aspect,
The second magnet has a first dimension perpendicular to the support surface smaller than that of the first magnet.
[0040]
According to the aspect (3) above, by forming the first dimension of the second magnet smaller than that of the first magnet, the amount of demagnetization in the Halbach magnet array can be reduced without using particularly expensive materials. , a magnetic field generator with a high magnetic field can be realized.
[0041]
(4) In another aspect, in the aspect of (1) or (2) above,
The first magnet has a first dimension orthogonal to the support surface smaller than that of the second magnet.
[0042]
According to the above aspect (4), by forming the first dimension of the first magnet smaller than that of the second magnet, the cooling performance is improved by increasing the contact area with the gap without using a particularly expensive material. It is possible to reduce the amount of demagnetization in the Halbach magnet arrangement while improving the magnetic field, and realize a magnetic field generator with a high magnetic field.
[0043]
(5) In another aspect, in the aspect of (2) above,
The dimension ratio of the second dimension of the second magnet to the second dimension of the first magnet (for example, the dimension ratio R2 in the above embodiment) is 1.5.
[0044]
According to the above aspect (5), by setting the dimension ratio in the parallel direction of the yoke facing surface to the above numerical value, when the magnetic field generating device is applied to the magnetic gear, the maximum transmission torque in the magnetic gear can be more effectively increased. can improve.
[0045] (6) In another aspect, in any one aspect of (1) to (5) above,
The first magnet and the two magnets are arranged so as to be in contact with the support surface.
[0046]
According to the aspect (6) above, both the first magnet and the second magnet are arranged so as to be in contact with each other on the support surface. Thereby, the first magnet and the second magnet can be fixed on the support surface with good strength, and excellent structural stability and rigidity can be obtained.
[0047]
(7) In another aspect, in any one aspect of (1) to (5) above,
one of the first magnet or the second magnet is arranged so as to be in contact with the support surface,
The other of the first magnet and the second magnet is arranged away from the support surface.
[0048]
According to the above aspect (7), one of the first magnet and the second magnet is arranged so as to be in contact with the support surface, while the other is arranged so as to be separated. This creates a space between the magnets that are spaced apart from the support surface and the support surface, increasing the contact area of ​​the magnets with the outside. As a result, the cooling performance of the magnet is improved, and thermal demagnetization, in which the coercive force of the magnet is reduced due to heat generation of the coil and an increase in ambient temperature, can be more effectively suppressed.
[0049]
(8) In another aspect, in the aspect of (7) above,
A cooling medium (for example, the cooling medium D in the above embodiment) can be supplied between the other of the first magnet or the second magnet and the support surface.
[0050]
According to the aspect (8) above, a cooling medium such as air or water is supplied to the space formed between the magnet and the support surface. As a result, the cooling performance of the magnet can be further improved, and thermal demagnetization, in which the coercive force of the magnet decreases due to the heat generation of the coil and the increase in ambient temperature, can be more effectively suppressed.
[0051]
(9) A magnetic gear according to one aspect,
The magnetic field generator according to any one of the above (1) to (8) (for example, the magnetic field generator 1 of the above embodiment) is provided.
[0052]
According to the above aspect (9), by providing the magnetic field generating device of each of the above aspects, it is possible to realize a magnetic gear having a larger maximum transmission torque by using a stronger magnetic field while suppressing the cost.
Code explanation
[0053]
1 Magnetic field generator
2 magnet
2a first magnet
2b second magnet
4 Support member
4a support surface
5 Outer diameter magnet field
6 coil
7 Inner diameter magnet field
9 magnetic gear
10 Magnetic pole piece device
41 magnetic pole pieces
42 Non-magnetic material
50 Cooling medium supply unit
B External demagnetizing field
D cooling medium
G Gap
H housing
The scope of the claims
[Claim 1]
A magnetic field generating device comprising a plurality of magnets on a support member arranged facing a gap,
The plurality of magnets are
a first magnet having a magnetization direction orthogonal to the support surface of the support member;
a second magnet having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
One of the first magnet and the second magnet has a first dimension perpendicular to the support surface that is smaller than the other of the first magnet and the second magnet, and is formed in a concave shape when viewed from the gap side. Magnetic field generator.
[Claim 2]
A magnetic field generating device comprising a plurality of magnets on a support member arranged facing a gap,
The plurality of magnets are
a first magnet having a magnetization direction orthogonal to the support surface of the support member;
a second magnet having a magnetization direction parallel to the support surface;
including
The first magnet and the second magnet constitute a Halbach magnet array alternately arranged along the support surface,
The magnetic field generator, wherein the second magnet has a second dimension parallel to the support surface that is larger than the first magnet.
[Claim 3]
The magnetic field generator according to claim 1 or 2, wherein the second magnet is smaller than the first magnet in a first dimension orthogonal to the support surface.
[Claim 4]
The magnetic field generator according to claim 1 or 2, wherein the first magnet is smaller than the second magnet in a first dimension orthogonal to the support surface.
[Claim 5]
3. The magnetic field generator according to claim 2, wherein the dimension ratio of said second dimension of said second magnet to said second dimension of said first magnet is 1.5.
[Claim 6]
The magnetic field generator according to any one of claims 1 to 5, wherein the first magnet and the two magnets are arranged so as to be in contact with the support surface.
[Claim 7]
one of the first magnet or the second magnet is arranged so as to be in contact with the support surface,
The magnetic field generator according to any one of claims 1 to 5, wherein the other of the first magnet and the second magnet is arranged away from the support surface.
[Claim 8]
The magnetic field generator according to claim 7, configured to supply a cooling medium between the other of the first magnet or the second magnet and the support surface.
[Claim 9]
A magnetic gear comprising the magnetic field generator according to any one of claims 1 to 8.