JP2015216716A - Composite magnetic material module for rotor, rotor, and manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite magnet material module for a rotor capable of reducing cogging torque or ripple torque and attaining reduction of cost, a rotor and a manufacturing method.SOLUTION: The composite magnetic material module for a rotor includes: a first magnetic material 10 formed from a plate-shaped rare-earth magnet; a second magnetic material 12 disposed at an outer diameter side closer to a stator 18 than the first magnetic material 10; and a third magnetic material 14 disposed at an inner diameter side farther away from the stator 18 than the first magnetic material 10. The second magnetic material 12 is wider than the first magnetic material 10 in a circumferential direction, and the third magnetic material 14 is wider than the first magnetic material 10 in the circumferential direction at least in a portion abutted with the first magnetic material 10. A cavity is present between the second magnetic material 12 and the third magnetic material 14, and a curvature radius on a surface of the second magnetic material 12 confronting the stator 18 is set larger than a curvature radius in an inner peripheral part of the stator 18.

Description

  The present invention relates to a composite magnetic material module for a rotor and a rotor.

  Conventionally, high-power motors for various electric vehicles such as hybrid vehicles and electric vehicles have been developed. The IPM motor has a structure in which a rare earth sintered magnet is embedded in a rotor formed of a silicon steel plate or the like. The SPM motor has a structure in which a rare earth sintered magnet is attached to the surface of a rotor formed of a silicon steel plate or the like.

  In Patent Document 1 below, a rotor is composed of a rotor shaft and a composite anisotropic magnet part, and the composite anisotropic magnet part has a polar anisotropic orientation consisting of 24 poles and has a recess in each magnetic pole part. It describes that it is composed of a cylindrical anisotropic rare earth bonded magnet with a magnet and a rare earth sintered magnet disposed in a recess. The anisotropic rare earth bonded magnet and the rare earth sintered magnet are joined with an adhesive, and the outer peripheral surface of the bonded anisotropic rare earth bonded magnet and the outer peripheral surface of the rare earth sintered magnet are integrally formed into a cylindrical shape. In addition, by disposing an anti-scattering net between a composite anisotropic magnet, which is a composite of a cylindrical anisotropic rare earth bonded magnet with a recess and a rare earth sintered magnet, and a cylindrical rare earth bonded magnet, the cylindrical rare earth It is described that a net for preventing scattering is embedded in a bonded magnet to prevent scattering of the sintered magnet.

Japanese Patent No. 4238588

  However, in the prior art, rare earth sintered magnets with strong magnetomotive force are often used as flat plates in consideration of cost. In that case, since the material between the rare earth sintered magnet and the stator core is a material (or air) having a uniform magnetic resistance, the flow of magnetic flux cannot be adjusted by the magnetic resistance, and cogging torque and torque ripple may occur. Of course, you can reduce the cogging torque and torque ripple by devising the shape of the rare earth sintered magnet, but to change from the flat plate shape that is the standard shape to the desired shape, the purchase cost and processing cost increase, The magnet strength is also reduced, which causes a magnet crack.

  An object of the present invention is to provide a composite magnetic material module for a rotor, a rotor, and a manufacturing method that can reduce cogging torque and torque ripple and reduce costs.

  The present invention is a composite magnetic material module for a rotor, comprising a first magnetic material made of a plate-shaped rare earth magnet and an outer diameter side closer to the stator than the first magnetic material, And a third magnetic material disposed on the inner diameter side farther from the stator than the first magnetic material, and the second magnetic material is more circumferential than the first magnetic material. The width of the third magnetic material is larger than that of the first magnetic material, and the third magnetic material has a larger width in the circumferential direction at least in a portion in contact with the first magnetic material. And a curvature of a surface of the second magnetic material facing the stator is set to be larger than a curvature of the inner peripheral portion of the stator.

  In the present invention, the purchase cost and the processing cost can be reduced by making the first magnetic material made of a relatively expensive rare earth magnet into a flat plate shape. Further, by making the curvature of the surface of the second magnetic material facing the stator, that is, the outer peripheral portion of the second magnetic material larger than the curvature of the inner peripheral portion of the stator, the central portion of the second magnetic material is made relatively The magnetic resistance at the center is relatively small compared to the end by making the end thicker and the end relatively thinner, and the magnetic flux from the first magnetic material is collected at the center, thereby cogging torque. And torque ripple can be reduced. Further, by making the circumferential width of the second magnetic material larger than the circumferential width of the first magnetic material, demagnetization of the first magnetic material due to the magnetic field generated by the stator can be suppressed. Furthermore, since the air gap exists between the second magnetic material and the third magnetic material, the leakage magnetic flux of the first magnetic material can be reduced, and the magnet amount of the first magnetic material can be reduced.

  In the present invention, in addition to the case where the second magnetic material and the third magnetic material exist as separate magnetic materials, the second magnetic material and the third magnetic material are joined at a specific portion to form one magnetic material. The case where it can be regarded as a material is also included.

  In one embodiment of the present invention, a fourth air gap is disposed between the second magnetic material and the third magnetic material so as to contact the first magnetic material. And a nonmagnetic material. The leakage flux of the first magnetic material can be more effectively suppressed by the fourth nonmagnetic material.

  In addition, the present invention provides a rotor configured by combining a plurality of the composite magnetic material modules for a rotor described above.

  The present invention is also a method of manufacturing a composite magnetic material module for a rotor, wherein an arrangement step is arranged in which a mold material serving as a substitute for a first magnetic material made of a plate-shaped rare earth magnet is disposed in a mold, This is a molding step in which the second magnetic material and the third magnetic material are molded by filling and pressing iron powder in the mold, and the second magnetic material is arranged on the outer diameter side closer to the stator than the mold material. The third magnetic material is disposed on the inner diameter side farther from the stator than the mold material, the second magnetic material has a larger circumferential width than the mold material, and the third magnetic material is The width in the circumferential direction is larger at least in the part in contact with the first magnetic material than the mold material, and a gap exists between the second magnetic material and the third magnetic material, and the second The curvature of the surface of the magnetic material facing the stator is the curvature of the inner periphery of the stator. Also set larger, characterized in that it comprises a molding step.

  In the present invention, the purchase cost and the processing cost can be reduced by making the first magnetic material made of a relatively expensive rare earth magnet into a flat plate shape. Further, by making the curvature of the surface of the second magnetic material facing the stator, that is, the outer peripheral portion of the second magnetic material larger than the curvature of the inner peripheral portion of the stator, the central portion of the second magnetic material is made relatively The magnetic resistance at the center is relatively small compared to the end by making the end thicker and the end relatively thinner, and the magnetic flux from the first magnetic material is collected at the center, thereby cogging torque. And torque ripple can be reduced. Further, by making the circumferential width of the second magnetic material larger than the circumferential width of the first magnetic material, demagnetization of the first magnetic material due to the magnetic field generated by the stator can be suppressed. Furthermore, since the air gap exists between the second magnetic material and the third magnetic material, the leakage magnetic flux of the first magnetic material can be reduced, and the magnet amount of the first magnetic material can be reduced. And in this invention, since the composite magnetic material module for rotors is integrally molded using a metal mold | die, the effort of an assembly can be saved and manufacturing cost can be reduced.

  In one embodiment of the present invention, in the arranging step, the mold material and the fourth nonmagnetic material are arranged in the mold.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce a cogging torque and a torque ripple, the composite magnet material module for rotors and rotor which can aim at cost reduction can be obtained.

It is a block diagram of the composite magnetic material module for rotors of an embodiment. It is a block diagram of the rotor of embodiment. It is a schematic diagram which shows the flow of the magnetic flux of embodiment. It is a block diagram of the composite magnetic material for rotors of a reference example. It is a graph which shows the relationship between a curvature ratio and cogging torque. It is a block diagram of the composite magnetic material module for rotors of other embodiment. It is a block diagram of the rotor of other embodiment. It is a schematic diagram which manufactures the module of embodiment. It is a schematic diagram which manufactures the rotor of embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a module of a composite magnetic material for a rotor in this embodiment. The composite magnetic material module 16 includes a first magnetic material 10, a second magnetic material 12, and a third magnetic material 14. The figure also shows the stator 18 that constitutes the motor together with the rotor.

  The first magnetic material 10 is composed of a flat plate-shaped rare earth sintered magnet. The rare earth sintered magnet is made of, for example, NdFeB magnet powder, SmFeN magnet powder, or the like, but is not limited thereto.

  The second magnetic material 12 is made of a magnetic material that is relatively easy to process, such as an electromagnetic steel plate, a dust core, and a bonded magnet. The second magnetic material 12 is in contact with the first magnetic material 10 and is disposed closer to the outer diameter side of the rotor than the first magnetic material 10, that is, closer to the stator 18. The width of the second magnetic material 12 is larger than that of the first magnetic material 10 in the circumferential direction (the circumferential direction in the case of configuring the rotor and the left-right direction in the drawing). 12 covers the entire stator side surface of the first magnetic material 10. The second magnetic material 12 wraps around the side of the first magnetic material 10, and contacts the first magnetic material 10 on three planes, that is, on the stator side surface and two side surfaces. Furthermore, the second magnetic material 12 has an outer peripheral portion, that is, a surface facing the stator 18 formed by a curved surface, the curved surface is bent in the same direction as the curved surface of the inner peripheral portion of the stator 18, and the curved surface The curvature is set larger than the curvature of the inner peripheral portion of the stator 18. In other words, when the radius of curvature of the second magnetic material 12 is ρ1 and the radius of curvature of the inner peripheral portion of the stator 18 is ρ2, ρ1 <ρ2. Since the surface of the second magnetic member 12 on the first magnetic member 10 side is a flat surface as a whole except for the convex portion for contact with the first magnetic member 10, the second magnetic member 12 has a second surface. The magnetic material 12 has a “kamaboko” type outer shape.

  The 3rd magnetic material 14 is comprised from soft magnetic materials, such as an electromagnetic steel plate and a dust core. The third magnetic material 14 is disposed on the inner diameter side of the rotor, that is, on the side farther from the stator 18 than the first magnetic material 10. As shown in the drawing, the third magnetic material 14 has a trapezoidal cross-sectional shape that is wide on the outer diameter side of the rotor and narrows toward the inner diameter side of the rotor. The circumferential width of the third magnetic material 14 on the side in contact with the first magnetic material 10 is larger than that of the first magnetic material 10. Accordingly, the third magnetic material 14 covers the entire surface of the first magnetic material 10 opposite to the stator 18. The third magnetic material 14 wraps around to the side of the first magnetic material 10, and the third magnetic material 14 also contacts the first magnetic material 10 in three planes.

  Thus, the rotor composite magnetic material module 16 of the present embodiment is composed of the three magnetic materials 10, 12, and 14, and the second magnetic material 12 and the first magnetic material 10 are arranged in order from the stator 18. The third magnetic material 14 is disposed. The second magnetic material 12 and the third magnetic material 14 are not in contact with each other, and more specifically between the second magnetic material 12 and the third magnetic material 14, more specifically, the second magnetic material 12 and the third magnetic material 14. A gap exists between the magnetic materials 14 and in the vicinity of the side surface of the first magnetic material 10.

  FIG. 2 shows an example in which the rotor 22 is configured by combining a plurality of modules 16 shown in FIG. A total of six modules 16 form a substantially cylindrical shape by bringing the side surfaces of the third magnetic members 14 into contact with each other. In other words, it can be said that the base angle of the third magnetic material 14 of each module 16 is set to an angle such that the six modules 16 have a substantially cylindrical shape. A rotor shaft 20 is provided at the center of the six modules 16.

  In the rotor 22 configured by combining a plurality of modules 16 and the rotor shaft 20, the first magnetic material 10 has a flat plate shape, and the second magnetic material 12 is positioned on the outer diameter side of the first magnetic material 10. The third magnetic material 14 is positioned on the inner diameter side of the first magnetic material 10, and a gap exists between the second magnetic material 12 and the third magnetic material 14. Further, the curvature of the outer peripheral portion of the second magnetic material 12 is larger than the curvature of the inner peripheral portion of the stator 18.

  As described above, the purchase cost and the processing cost can be reduced by making the first magnetic material 10 made of a relatively expensive rare earth sintered magnet into a flat plate shape. Moreover, the processing cost can be reduced by configuring the second magnetic material 12 with a magnetic material that can be easily processed. Further, by making the curvature of the outer peripheral portion of the second magnetic material 12 larger than the curvature of the inner peripheral portion of the stator 18, cogging torque and torque ripple can be reduced. That is, the central part of the second magnetic material 12 is made relatively thick and the end part is made relatively thin so that the magnetic resistance at the center part is made relatively smaller than that of the end part. The magnetic flux from 10 can be collected in the center, and cogging torque and torque ripple can be reduced. Further, by making the circumferential width of the second magnetic material 12 larger than the circumferential width of the first magnetic material 12, the first magnetic material 10 is demagnetized by the magnetic field generated by the stator 18. Can be suppressed. In addition, since the second magnetic material 12 is in contact with the first magnetic material 10 in three planes, the second magnetic material 12 can be firmly positioned with respect to the first magnetic material 10. Thereby, it can suppress that the position of the 2nd magnetic material 12 shifts, and can reduce cogging torque and torque ripple by imbalance of magnetic resistance. Furthermore, since the gap exists between the second magnetic material 12 and the third magnetic material 14, the leakage magnetic flux of the first magnetic material 10 can be reduced. The amount of magnets can be reduced.

  FIG. 3 schematically shows the flow of magnetic flux of the module 16 in the present embodiment. The magnetic flux from the first magnetic material 10 and the magnetic flux from the other composite magnetic material module are collected in the center by the curved surface on the outer diameter side of the second magnetic material 12 and headed toward the stator 18. Further, since there is a gap between the second magnetic material 12 and the third magnetic material 14, that is, on the side surface of the first magnetic material 10, the second magnetic material 12 and the third magnetic material 14 are temporarily When there is no air gap due to contact, the magnetic flux is small and the leakage magnetic flux increases. However, the magnetic flux can be effectively suppressed by increasing the magnetic resistance due to the presence of the air gap. Since the second magnetic material 12 is composed of a magnetic material that is relatively easy to process, such as an electromagnetic steel plate, a dust core, and a bonded magnet, it is not difficult to process the outer diameter side into a curved surface. However, the second magnetic material 12 is preferably composed of a magnetic material with even smaller vortex loss in order to increase the amount of magnetic flux toward the stator 18.

  FIG. 4 shows a reference example when the outer diameter side of the second magnetic material 12 is not a curved surface but a flat surface. In this case, since the magnetic flux collecting effect as described above cannot be obtained, cogging torque and torque ripple are generated. The applicant applies the second magnetic material 12 as shown in FIG. 1 when the cogging torque and torque ripple generated when the outer diameter side of the second magnetic material 12 is flat as shown in FIG. It has been confirmed that the cogging torque can be reduced to 25% or less and the torque ripple can be reduced to 30% or less when the outer peripheral surface is curved.

  The outer diameter side surface of the second magnetic material 12 is preferably a curved surface instead of a flat surface, but as described above, it is particularly preferable to make it larger than the curvature of the inner peripheral side of the stator 18. is there.

FIG. 5 shows a change in cogging torque with respect to the ratio of the curvature on the outer diameter side of the second magnetic material 12 and the curvature on the inner peripheral side of the stator 18. In the figure, the horizontal axis is the proportion of curvature,
Curvature ratio = (curvature radius of second magnetic material 12 / curvature radius of inner circumference side of stator 18)
It is. The curvature ratio = 1 indicates that the curvature of the second magnetic material 12 is equal to the curvature on the inner peripheral side of the stator 18. The vertical axis represents the cogging torque, and the cogging torque generated when the curvature ratio = 1 is shown as 1. As the curvature of the second magnetic material 12 increases (the radius of curvature decreases) and the curvature ratio decreases below 1, the cogging torque decreases approximately linearly. Therefore, it is preferable that the curvature of the second magnetic material 12 is at least larger than the curvature on the outer diameter side of the stator 18 from the viewpoint of cogging torque reduction.

  FIG. 6 shows a module 16 of a composite magnetic material for a rotor in another embodiment. The difference from FIG. 1 is that a fourth nonmagnetic material 13 is disposed in the gap between the second magnetic material 12 and the third magnetic material 14.

  That is, the second magnetic material 12 is disposed on the outer diameter side and the third magnetic material 14 is disposed on the inner diameter side of the first magnetic material 10 having a flat plate shape. There is a gap between the second magnetic material 12 and the third magnetic material 14, that is, the side surface of the first magnetic material 10, and the fourth nonmagnetic material 13 is disposed so as to fill the gap. . The module 16 includes a first magnetic material 10, a second magnetic material 12, a third magnetic material 14, and a fourth nonmagnetic material 13.

  The fourth nonmagnetic material 13 is made of a nonmagnetic and high electrical resistance material, suppresses the leakage magnetic flux of the first magnetic material 10, and reduces eddy loss.

  FIG. 7 shows an example in which the rotor 22 is configured by combining a plurality of modules 16 shown in FIG. A total of six modules 16 form a substantially cylindrical shape by bringing the side surfaces of the third magnetic members 14 into contact with each other. In other words, it can be said that the base angle of the third magnetic material 14 of each module 16 is set to an angle such that the six modules 16 have a substantially cylindrical shape. A rotor shaft 20 is provided at the center of the six modules 16.

  Also in the present embodiment, the purchase cost and the processing cost can be reduced by making the first magnetic material 10 made of a relatively expensive rare earth sintered magnet into a flat plate shape. Moreover, the processing cost can be reduced by configuring the second magnetic material 12 with a magnetic material that can be easily processed. Further, the cogging torque and the torque ripple can be reduced by making the curvature of the outer peripheral portion of the second magnetic material 12 larger than the curvature of the inner peripheral portion of the stator 18. That is, the central part of the second magnetic material 12 is made relatively thick and the end part is made relatively thin so that the magnetic resistance at the center part is made relatively smaller than that of the end part. The magnetic flux from 10 can be collected in the center, and cogging torque and torque ripple can be reduced. Further, by making the circumferential width of the second magnetic material 12 larger than the circumferential width of the first magnetic material 12, the first magnetic material 10 is demagnetized by the magnetic field generated by the stator 18. Can be suppressed. In addition, since the second magnetic material 12 is in contact with the first magnetic material 10 in three planes, the second magnetic material 12 can be reliably positioned with respect to the first magnetic material 10. Thereby, it can suppress that the position of the 2nd magnetic material 12 shifts, and can reduce cogging torque and torque ripple by imbalance of magnetic resistance. In addition, since the gap exists between the second magnetic material 12 and the third magnetic material 14, the leakage magnetic flux of the first magnetic material 10 can be reduced. The amount of magnets can be reduced. Further, in the present embodiment, the second magnetic material 12 and the fourth nonmagnetic material 13 are joined, and the third magnetic material 14 and the fourth nonmagnetic material 13 are joined, so that the first magnetic material 12 and the fourth nonmagnetic material 13 are joined. It is possible to reduce the stress applied to the magnetic material 10 and effectively prevent the first magnetic material 10 from cracking.

  As described above, in the present embodiment, the module 16 is configured from the first magnetic material 10, the second magnetic material 12, the third magnetic material 14, or in addition to the fourth nonmagnetic material 13. Cogging torque and torque ripple can be reduced while realizing low cost, but the module 16 is manufactured by individually forming these magnetic materials or non-magnetic materials and then bonding them together with an adhesive. Alternatively, it may be integrally formed using a mold.

  FIG. 8 schematically shows a manufacturing method in which the module 16 is integrally formed using a mold. First, as a substitute for the first magnetic material 10, a mold material 11 having the same shape and the same size as the first magnetic material 10 is prepared, and the mold material 11 and the fourth nonmagnetic material 13 are placed at predetermined positions in the mold 30. insert. Next, iron powder is filled in the gaps between the mold material 11 and the fourth non-magnetic material 13 and the mold 30, and the second magnetic material 12 and the third magnetic material 12 are pressed by applying a predetermined pressure to be hardened. The magnetic material 14 is molded. For this reason, the mold 30 has an inner surface along the curved surface on the outer diameter side of the second magnetic material 12 and an inner surface along the cross-sectional trapezoid of the third magnetic material 14. Thereafter, the module 16 can be obtained by replacing the mold member 11 with the first magnetic member 10. The reason why the mold material 11 is used as a substitute for the first magnetic material 10 is to prevent the rare earth sintered magnet from cracking in the compacting process.

  In FIG. 8, the mold material 11 and the fourth nonmagnetic material 13 are inserted into predetermined positions in the mold 30, but only the mold material 11 is inserted into the predetermined position in the mold 30 and then filled with iron powder. Then, the second magnetic material 12 and the third magnetic material 14 may be formed by applying and compressing a predetermined pressure. This corresponds to the molding of the module 16 of FIG.

  In FIG. 8, the module 16 is molded by the mold 30, but a rotor formed by combining the modules 16 may be integrally molded by the mold.

  FIG. 9 schematically shows the manufacturing method in this case. The mold material 11 and the fourth nonmagnetic material 13 constituting each module 16 are inserted into predetermined positions in the mold 32, and iron is inserted into the gap between the mold material 11, the fourth nonmagnetic material 13 and the mold 32. The 2nd magnetic material 12 and the 3rd magnetic material 14 are shape | molded by filling with powder and applying a predetermined pressure and making it harden. In this case, the third magnetic material 14 is not molded individually for each module 16 but integrally formed. For this reason, in the figure, the third magnetic material 14 is shown as a ring-shaped third magnetic material 15.

  As described above, the module 16 can be integrally formed using the mold 30 or the rotor can be integrally formed using the mold 32, so that the manufacturing cost can be reduced. Together, it can effectively reduce the cost of the rotor.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this, A various deformation | transformation is possible.

  For example, in this embodiment, as shown in FIG. 2 and FIG. 7, the rotor 22 is configured by combining a total of six modules 16, but not only the plurality of modules 16 but also the modules 16 and 16. The rotor 22 may be configured by providing an intervening member between them. In short, the module 16 is a main member of the rotor, but the rotor 22 is not necessarily composed of only the module 16. In the present embodiment, the rotor 22 is composed of six modules 16, but the number of modules 16 is arbitrary, and may be six or less, or six or more. Of course, as the number of modules 16 increases, the rotor 22 formed by combining them becomes more like a cylindrical shape.

  In the present embodiment, the second magnetic material 12 and the third magnetic material have different magnetic characteristics or mechanical characteristics to be provided, and the second magnetic material 12 is easy to process and has a small eddy loss. The third magnetic material needs to be soft magnetic, but need not be different magnetic materials, and may be the same magnetic material. In addition, there is a gap between the second magnetic material 12 and the third magnetic material 14, which means that the second magnetic material 12 and the third magnetic material 14 are necessarily separate members. do not do. That is, although the second magnetic material 12 and the second magnetic property 14 are composed of the same magnetic material, and there is a gap between the two in the vicinity of the side of the flat first magnetic material 10, When the two are joined at a position separated from the side portion of the first magnetic material 10, the second magnetic material 12 and the third magnetic material 14 can be regarded as an integral magnetic material as a whole. The present invention also includes a form in which the second magnetic material 12 and the third magnetic material 14 can be regarded as an integral magnetic material.

  Further, when the rotor 22 is configured by combining a plurality of modules 16, an uneven portion may be formed in the third magnetic body 14, and the adjacent modules 16 may be engaged by these uneven portions. .

  DESCRIPTION OF SYMBOLS 10 1st magnetic material, 12 2nd magnetic material, 13 4th nonmagnetic material, 14 3rd magnetic material, 16 module, 18 stator, 20 rotor shaft, 22 rotor.

Claims (5)

A composite magnetic material module for a rotor,
A first magnetic material made of a plate-shaped rare earth magnet;
A second magnetic material disposed on the outer diameter side closer to the stator than the first magnetic material;
A third magnetic material disposed on the inner diameter side farther from the stator than the first magnetic material;
With
The second magnetic material has a larger circumferential width than the first magnetic material,
The third magnetic material has a circumferential width larger at least in a portion in contact with the first magnetic material than the first magnetic material,
There is a gap between the second magnetic material and the third magnetic material,
The rotor composite magnetic material module, wherein a curvature of a surface of the second magnetic material facing the stator is set larger than a curvature of an inner peripheral portion of the stator. The composite magnetic material module for a rotor according to claim 1,
A fourth non-magnetic material that is disposed so as to be in contact with the first magnetic material in the gap between the second magnetic material and the third magnetic material;
A composite magnetic material module for a rotor, further comprising:   A rotor configured by combining a plurality of the composite magnetic material modules for a rotor according to claim 1. A method of manufacturing a composite magnetic material module for a rotor,
An arrangement step of arranging a mold material as a substitute for the first magnetic material made of a plate-shaped rare earth magnet in the mold,
It is a forming step of forming the second magnetic material and the third magnetic material by filling and pressing the iron powder in the mold, and the second magnetic material is closer to the stator than the mold material. The third magnetic material is disposed on the inner diameter side farther from the stator than the mold material, and the second magnetic material has a larger circumferential width than the mold material, and the third magnetic material is The material has a circumferential width larger at least in a portion in contact with the first magnetic material than the mold material, and a gap exists between the second magnetic material and the third magnetic material, The curvature of the surface facing the stator of the magnetic material of 2 is set larger than the curvature of the inner peripheral portion of the stator,
A method for manufacturing a composite magnetic material module for a rotor, comprising: In the manufacturing method of Claim 4,
In the arranging step, the mold material and the fourth non-magnetic material are arranged in the mold. A method of manufacturing a composite magnetic material module for a rotor, wherein:

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