WO2022130870A1

WO2022130870A1 - Method for manufacturing rotor

Info

Publication number: WO2022130870A1
Application number: PCT/JP2021/041890
Authority: WO
Inventors: 晃司迫田; 秀海大熊
Original assignee: 株式会社Ihi
Priority date: 2020-12-17
Filing date: 2021-11-15
Publication date: 2022-06-23
Also published as: JP2024012730A

Abstract

This method for manufacturing a rotor is provided with: a joining step in which a magnet, a first shaft, and a second shaft are joined to each other; a first machining step in which the side surfaces of each of the magnet, the first shaft, and the second shaft are machined so that the side surfaces of the magnet, the first shaft, and the second shaft form the same cylindrical side surface; a fitting step in which armoring is fitted to the magnet, the first shaft, and the second shaft so that the side surface of the magnet, the magnet side of the side surface of the first shaft, and the magnet side of the side surface of the second shaft are covered with armoring and the opposite side of the side surface of the first shaft from the magnet side and the opposite side of the side surface of the second shaft from the magnet side are exposed from the armoring; and a second machining step in which the side surfaces of the first shaft and the second shaft exposed from the armoring are machined using the outer circumferential surface of the armoring as a reference.

Description

Rotor manufacturing method

This disclosure relates to a method for manufacturing a rotor.

A technique for manufacturing a rotor for an electric motor has been proposed. For example, in the method for manufacturing a rotor disclosed in Patent Document 1, a shaft body having a pre-finished shape is joined to the bottom surfaces of both columnar magnets. The magnets and the two shafts joined to each other by shrink fitting so that the side surfaces of the magnets and the two shafts joined to each other are covered by the armoring while being in contact with the inner peripheral surface of the annular armoring. Armoring is fitted.

Jikkai Sho 62-119182

By the way, in the above manufacturing method, it is difficult to join the magnet so as to align the central axes of the magnet and the two shaft bodies at both ends of the magnet. In the above manufacturing method, the accuracy with which the central axes of the magnet and the two shafts are aligned depends on the accuracy of the shape of the magnet and the two shafts and the accuracy of the jig for axis alignment. Further, in the above manufacturing method, the accuracy in which the side surfaces of the magnets joined to each other and the two shaft bodies are aligned is also low. Therefore, it is possible that the magnet and the armoring fitted to the two shafts do not have sufficient tightening allowance. As described above, in the above manufacturing method, the accuracy of the manufactured rotor is low.

Therefore, this disclosure describes a method for manufacturing a rotor that can improve the accuracy of the rotor to be manufactured.

One aspect of the present disclosure is to join one bottom surface of a columnar first shaft body to one bottom surface of a columnar magnet, and to join one bottom surface of a columnar second shaft body to the other bottom surface of the magnet. By doing so, the joining step of joining the magnet, the first shaft body and the second shaft body to each other and the joining so that the side surfaces of the magnet, the first shaft body and the second shaft body form the same cylindrical side surface. In the first processing step of processing the side surfaces of the magnet, the first shaft body and the second shaft body, which are joined to each other in the step, and the side surface of the magnet, the side surface of the first shaft body, the side of the magnet and the second shaft body. The side of the magnet on the side surface is covered with the armor ring while being in contact with the inner peripheral surface of the annular armor ring. A fitting process in which the armoring is fitted to the magnet, the first shaft body and the second shaft body whose side surfaces are machined in the first processing step so that the opposite side is exposed from the armoring, and the outer peripheral surface of the armoring. The second processing to process the side surfaces of the magnet, the first shaft body and the second shaft body exposed from the armoring of the first shaft body and the second shaft body to which the armoring is fitted in the fitting process. It is a method for manufacturing a rotor including a process.

According to the rotor manufacturing method of one aspect of the present disclosure, the accuracy of the manufactured rotor can be improved.

It is a vertical sectional view which shows the magnet, the 1st shaft body and the 2nd shaft body in the method of manufacturing a rotor which concerns on 1st Embodiment. It is a vertical sectional view which shows the joining process in the manufacturing method of the rotor which concerns on 1st Embodiment. It is a vertical sectional view which shows the 1st processing process in the manufacturing method of the rotor which concerns on 1st Embodiment. It is a vertical sectional view which shows the fitting process in the manufacturing method of the rotor which concerns on 1st Embodiment. It is a vertical sectional view which shows the 2nd processing process in the manufacturing method of the rotor which concerns on 1st Embodiment. It is a vertical sectional view which shows the joining process in the manufacturing method of the rotor which concerns on 2nd Embodiment.

According to this configuration, in the first processing step, the magnets, the magnets already joined to each other in the joining step, so that the side surfaces of the magnet, the first shaft body and the second shaft body form the same cylindrical side surface, the first. Each side surface of the shaft body and the second shaft body is processed. Therefore, the accuracy with which the side surfaces of the magnet, the first shaft body, and the second shaft body match after the first processing step does not depend on the precision of the step before the joining step. Therefore, it is possible to improve the accuracy in which the side surfaces of the magnets, the first shaft body and the second shaft body joined to each other are aligned, and it is also possible to improve the accuracy of the tightening allowance of the armoring to be fitted in the subsequent fitting step.

Further, in the second processing step, the side surfaces of the magnets, the first shaft body and the second shaft body in the first shaft body and the second shaft body that have already been joined to each other in the joining step are based on the outer peripheral surface of the armoring. It will be processed. Therefore, the accuracy with which the magnet, the first axis, and the central axis of the second axis match after the second processing does not depend on the accuracy of the process before the joining process. Therefore, it is possible to improve the accuracy in which the central axes of the magnet, the first shaft body, and the second shaft body are aligned. As described above, according to this configuration, the accuracy of the manufactured rotor can be improved.

In this case, in the first processing step, the other bottom surface of the first shaft body and the other bottom surface of the second shaft body are supported while supporting the side surface of any of the magnet, the first shaft body, and the second shaft body. Instead, the side surfaces of the magnet, the first shaft body, and the second shaft body may be machined.

According to this configuration, in the first processing step, any side surface of the magnet, the first shaft body and the second shaft body is supported. However, the other bottom surface of the first shaft body and the other bottom surface of the second shaft body are not supported, and the side surfaces of the magnet, the first shaft body, and the second shaft body are machined. Therefore, the supporting force required for processing is not applied to the joint portion between the magnet and the first shaft body and the joint portion between the magnet and the second shaft body. Therefore, it is possible to reduce the damage of the joint portion in the first processing step and improve the yield of rotor manufacturing.

Further, in the joining step, unevenness provided on one bottom surface of the magnet and one bottom surface of the first axis body so as to limit mutual movement in the direction intersecting the central axis of the magnet and the first axis body. The bottom surface of one of the magnets is joined to the bottom surface of one of the magnets while the portions are fitted to each other, so that the movement of the magnet in the direction intersecting the central axis of the magnet and the second axis is restricted. One bottom surface of the second axis body may be joined to the other bottom surface of the magnet while the uneven portions provided on the other bottom surface and one bottom surface of the second axis body are fitted to each other.

According to this configuration, in the joining step, on one bottom surface of the magnet and one bottom surface of the first shaft body so as to limit each other's movement in the direction intersecting the central axis of the magnet and the first shaft body, respectively. The provided uneven portions are fitted to each other, and one bottom surface of the first shaft body is joined to one bottom surface of the magnet. Further, in the joining step, unevenness provided on each of the other bottom surface of the magnet and one bottom surface of the second axis body so as to limit mutual movement in the direction intersecting the central axis of the magnet and the second axis body. The portions are fitted to each other and one bottom surface of the second shaft body is joined to the other bottom surface of the magnet. As a result, after the joining step, the magnet, the first shaft body, and the second shaft body are less likely to be displaced in the direction intersecting the central axis.

In the joining step, one bottom surface of the first shaft body is joined to one bottom surface of the magnet using an adhesive, and one bottom surface of the second shaft body is joined to the other bottom surface of the magnet using an adhesive. You may.

According to this configuration, in the joining step, one bottom surface of the first shaft body is joined to one bottom surface of the magnet using an adhesive, and one of the second shaft bodies is joined to the other bottom surface of the magnet using an adhesive. The bottom of the magnet is joined. Therefore, the joining process can be executed by a simple method.

Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, in the method for manufacturing a rotor of the first embodiment, a magnet 1A, a first shaft body 11A, and a second shaft body 21A are prepared. The magnet 1A is a columnar permanent magnet. The magnet 1A has one bottom surface 2 and the other bottom surface 3. The magnet 1A includes an uneven portion 4 on one bottom surface 2 and an uneven portion 5 on the other bottom surface 3. The magnet 1A has a side surface 6 between the bottom surface 2 and the bottom surface 3.

The first shaft body 11A is a columnar metal member having substantially the same diameter as the magnet 1A. The first shaft body 11A has one bottom surface 12 and the other bottom surface 13. The first shaft body 11A includes an uneven portion 14 on one bottom surface 12. The first shaft body 11A has a side surface 16 between the bottom surface 12 and the bottom surface 13. The second shaft body 21A is a columnar metal member having substantially the same diameter as the magnet 1A, and has the same shape as the first shaft body 11A. The second shaft body 21A has one bottom surface 22 and the other bottom surface 23. The second shaft body 21A includes an uneven portion 24 on one bottom surface 22. The second shaft body 21A has a side surface 26 between the bottom surface 22 and the bottom surface 23.

The uneven portion 4 of one bottom surface 2 of the magnet 1A and the uneven portion 14 of one bottom surface 12 of the first shaft body 11A have shapes corresponding to each other, and by fitting each other, the magnet 1A and the first shaft It limits each other's movement in the direction intersecting the central axis A of the body 11A. The uneven portion 5 of the other bottom surface 3 of the magnet 1A and the uneven portion 24 of the other bottom surface 22 of the second shaft body 21A have shapes corresponding to each other, and by fitting each other, the magnet 1A and the second shaft It limits each other's movement in the direction intersecting the central axis A of the body 21A.

The shapes of the

uneven portions

4, 5, 14, and 24 restrict the movement of the magnet 1A, the first shaft body 11A, and the second shaft body 21A in the direction intersecting the central axis A by fitting each other. Any shape may be used as long as it is used. For example, in the example of FIG. 1, the

uneven portions

4 and 5 of the magnet 1A project in a direction parallel to the central axis A at the central portions of the bottom surfaces 2 and 3, and the central shafts at the peripheral portions of the bottom surfaces 2 and 3. It has a concave shape in the direction parallel to A. On the contrary, the uneven portion 14 of the bottom surface 12 of the first shaft body 11A and the uneven portion 24 of the bottom surface 22 of the second shaft body 21A are recessed in the central portions of the bottom surfaces 12 and 22 in the direction parallel to the central axis A. Each of the peripheral edges of the bottom surfaces 12 and 22 has a shape protruding in a direction parallel to the central axis A. Further, the shapes of the

uneven portions

4, 5, 14, and 24 move each other in the direction of rotation around the central axis A of the magnet 1A, the first shaft body 11A, and the second shaft body 21A by fitting each other. May be limited.

As shown in FIG. 2, the joining step S1 is executed for the magnet 1A, the first shaft body 11A, and the second shaft body 21A. In the joining step S1, one bottom surface 12 of the columnar first shaft body 11A is joined to one bottom surface 2 of the columnar magnet 1A, and the columnar second shaft body 21A is bonded to the other bottom surface 3 of the magnet 1A. By joining one of the bottom surfaces 22, the magnet 1A, the first shaft body 11A, and the second shaft body 21A are joined to each other.

In the joining step S1, one bottom surface 2 of the magnet 1A and one bottom surface 12 of the first shaft body 11A are restricted from moving in a direction intersecting the central axis A of the magnet 1A and the first shaft body 11A. One bottom surface 12 of the first shaft body 11A is joined to one bottom surface 2 of the magnet 1A while the

uneven portions

4 and 14 provided on the respective surfaces are fitted to each other. Further, in the joining step S1, the other bottom surface 3 of the magnet 1A and the one bottom surface of the second axis body 21A are restricted so as to limit the mutual movement of the magnet 1A and the second axis body 21A in the direction intersecting the central axis A. One bottom surface 22 of the second shaft body 21A is joined to the other bottom surface 3 of the magnet 1A while the

uneven portions

5 and 24 provided on each of the 22 22 are fitted to each other.

Further, in the joining step S1, one bottom surface 12 of the first shaft body 11A is joined to one bottom surface 2 of the magnet 1A using the adhesive 30, and the other bottom surface 3 of the magnet 1A is bonded using the adhesive 30. One bottom surface 22 of the biaxial body 21A is joined. For example, a thermosetting epoxy-based adhesive can be applied to the adhesive 30.

As shown in FIG. 3, the first processing step S2 is executed for the magnets 1A, the first shaft body 11A, and the second shaft body 21A joined to each other in the joining step S1. In the first processing step S2, the magnets joined to each other in the joining step S1 so that the side surfaces 6, 16 and 26 of the magnet 1A, the first shaft body 11A and the second shaft body 21A form the same cylindrical side surface. The side surfaces 6, 16 and 26 of 1A, the first shaft body 11A and the second shaft body 21A are machined. Therefore, after the first processing step S2, the magnets 1A, the first shaft body 11A, and the second shaft body 21A joined to each other in the joining step S1 have the bottom surfaces 13, 23 and the side surfaces 6, 16, 26 that coincide with each other 1. Form two cylinders.

In the first processing step S2, while the side surfaces 6, 16 and 26 of any of the magnet 1A, the first shaft body 11A and the second shaft body 21A are supported, the other bottom surface 13 and the second shaft of the first shaft body 11A are supported. The side surfaces 6, 16 and 26 of the magnet 1A, the first shaft body 11A and the second shaft body 21A are machined without supporting the other bottom surface 23 of the body 21A. That is, the first processing step S2 is executed by centerless polishing. In centerless polishing, the magnets 1A, the first shaft body 11A, and the second shaft body 21A joined to each other are supported by the support blade 41 from below between the adjusting wheel 42 and the grinding wheel 43. By rotating the adjusting wheel 42 and the grinding wheel 43, the rotations of the magnet 1A, the first shaft body 11A and the second shaft body 21A joined to each other are adjusted, and the magnet 1A, the first shaft body 11A and the second shaft are adjusted. The

sides

6, 16 and 26 of the body 21A are processed.

As shown in FIG. 4, the fitting step S3 is executed for the magnet 1A, the first shaft body 11A, and the second shaft body 21A whose side surfaces 6, 16 and 26 are machined in the first processing step S2. .. In the fitting step S3, the side surface 6 of the magnet 1A, the side of the side surface 16 of the first shaft body 11A 16 and the side of the side surface 26 of the second shaft body 21A 26 are the inner peripheral surface 52 of the annular armoring 51. The side of the side surface 16 of the first shaft body 11A opposite to the side of the magnet 1A and the side of the side surface 26 of the second shaft body 21A opposite to the side of the magnet 1A are exposed from the armoring 51. The armoring 51 is fitted to the magnets 1A, the first shaft body 11A, and the second shaft body 21A whose side surfaces 6, 16 and 26 are machined in the first processing step S2.

The armoring 51 is an annular metal member having an inner peripheral surface 52 and an outer peripheral surface 53. The fitting step S3 is executed, for example, by shrink fitting in which the heated and expanded armoring 51 is fitted to the magnet 1A, the first shaft body 11A, and the second shaft body 21A, and is cooled and shrunk after fitting. ..

As shown in FIG. 5, the second processing step S4 is executed for the magnet 1A, the first shaft body 11A, and the second shaft body 21A to which the armoring 51 is fitted in the fitting step S3. In the second processing step S4, the magnet 1A, the first shaft body 11A, and the magnet 1A to which the armoring 51 is fitted in the fitting step S3 are used with the outer peripheral surface 53 of the armoring 51 as a reference (reference surface, datum). The side surfaces 16 and 26 of the first shaft body 11A and the second shaft body 21A exposed from the armoring 51 of the second shaft body 21A are machined.

In the second processing step S4, the outer peripheral surfaces 53 are the side surfaces 16 and 26 of the first shaft body 11A and the second shaft body 21A exposed from the armoring 51 with reference to the outer peripheral surface 53 of the armoring 51 by a reference device 60 or the like. The

sides

16 and 26 are processed so as to be separated from the surface by a certain distance. After the second processing step S4, each of the side surface 16 of the first shaft body 11A exposed from the armoring 51 and the side surface 26 of the second shaft body 21A form a side surface of a cylinder having a central axis A common to each other. As described above, the rotor 100 of the electric motor is manufactured.

In the present embodiment, in the first processing step S2, the joining step S1 has already been performed so that the side surfaces 6, 16 and 26 of the magnet 1A, the first shaft body 11A and the second shaft body 21A form the same cylindrical side surface. The side surfaces 6, 16 and 26 of the magnets 1A, the first shaft body 11A and the second shaft body 21A joined to each other are machined. Therefore, the accuracy with which the magnets 1A, the first shaft body 11A, and the side surfaces 6, 16 and 26 of the second shaft body 21A match after the first processing step S2 does not depend on the accuracy of the steps before the joining step S1. Therefore, it is possible to improve the accuracy in which the side surfaces 6, 16 and 26 of the magnets 1A, the first shaft body 11A and the second shaft body 21A joined to each other match, and the armoring to be fitted in the subsequent fitting step S3. The accuracy of the tightening allowance of 51 can also be improved. That is, in the present embodiment, the tightening allowance can be easily controlled.

Further, in the second processing step S4, the side surfaces 16 of the first shaft body 11A and the second shaft body 21A in the magnet 1A, the first shaft body 11A and the second shaft body 21A already joined to each other in the joining step S1. 26 is processed with reference to the outer peripheral surface 53 of the armoring 51. Therefore, the accuracy with which the central axes A of the magnet 1A, the first axis 11A, and the second axis 21A match after the second processing does not depend on the accuracy of the process before the joining process S1. Therefore, it is possible to improve the accuracy in which the central axes A of the magnet 1A, the first shaft body 11A, and the second shaft body 21A are aligned. As described above, according to the present embodiment, the accuracy of the manufactured rotor 100 can be improved. Further, according to the present embodiment, the production yield of the rotor 100 can be improved.

Further, according to the present embodiment, in the first processing step S2, the side surfaces 6, 16 and 26 of any of the magnet 1A, the first shaft body 11A and the second shaft body 21A are supported. However, the other bottom surface 13 of the first shaft body 11A and the other bottom surface 23 of the second shaft body 21A are not supported, and the side surfaces 6 and 6 of the magnet 1A, the first shaft body 11A and the second shaft body 21A, respectively. 16 and 26 are processed. Therefore, the joints between the magnet 1A and the first shaft body 11A (bottoms 2 and 12) and the joints between the magnet 1A and the second shaft 21A (bottoms 3 and 22) are for support necessary for processing. No force is applied. Therefore, it is possible to reduce the damage of the jointed portion joined by the adhesive 30 in the first processing step S2 and improve the manufacturing yield of the rotor 100.

Further, according to the present embodiment, in the joining step S1, one of the bottom surfaces 2 and the first of the magnets 1A so as to limit the mutual movement of the magnet 1A and the first shaft body 11A in the direction intersecting the central axis A. Concavo-

convex portions

4, 14 provided on one bottom surface 12 of the shaft body 11A are fitted to each other, and one bottom surface 12 of the first shaft body 11A is joined to one bottom surface 2 of the magnet 1A. Further, in the joining step S1, the other bottom surface 3 of the magnet 1A and the one bottom surface of the second axis body 21A are restricted so as to limit the mutual movement of the magnet 1A and the second axis body 21A in the direction intersecting the central axis A. The

uneven portions

5 and 24 provided on each of the 22 are fitted to each other, and one bottom surface 22 of the second shaft body 21A is joined to the other bottom surface 3 of the magnet 1A. As a result, after the joining step S1, each of the magnet 1A, the first shaft body 11A, and the second shaft body 21A is less likely to shift in the direction intersecting the central axis A.

Further, according to the present embodiment, the magnet 1A, the first shaft body 11A, and the second shaft body 21A are less likely to be displaced in the direction intersecting the central axis A due to the forces from the side surfaces 6, 16 and 26. Centerless polishing in 1 processing step S2 also becomes easy.

Further, according to the present embodiment, in the joining step S1, one bottom surface 12 of the first shaft body 11A is joined to the one bottom surface 2 of the magnet 1A using the adhesive 30, and the magnet 1A is bonded using the adhesive 30. One bottom surface 22 of the second shaft body 21A is joined to the other bottom surface 3. Therefore, the joining step S1 can be executed by a simple method.

Hereinafter, the second embodiment will be described. As shown in FIG. 6, in the present embodiment, the magnet 1B does not have the

uneven portions

4 and 5 on the bottom surfaces 2 and 3, and the bottom surfaces 2 and 3 are uniform flat surfaces. Further, the first shaft body 11B does not have the uneven portion 14 on the bottom surface 12, the second shaft body 21B does not have the uneven portion 24 on the bottom surface 22, and the bottom surfaces 12 and 22 have a uniform flat surface. be. Further, in the joining step S1, the adhesive 30 is not used.

Each of the magnet 1B, the first shaft body 11B, and the second shaft body 21B has

bolt holes

7, 17, and 27 extending along the central axis A. In the joining step S1, the bolt 71 is inserted into each of the bolt holes 7, 17, and 27, and the nut 72 is screwed into one end of the bolt 71. The first processing step S2, the fitting process S3, and the second processing step S4 after the joining step S1 are executed in the same manner as in the first embodiment. After the fitting step S3, the bolt 71 and the nut 72 may be removed from the bolt holes 7, 17, 27.

According to the present embodiment, the bottom surfaces 2, 3, 12, and 22 of the magnet 1B, the first shaft body 11B, and the second shaft body 21B are not provided with the

uneven portions

4, 5, 14, 24, and are bonded in the joining step S1. Even if the agent 30 is not used, the joining step S1, the first processing step S2, the fitting step S3, and the second processing step S4 can be executed. Further, also in this embodiment, after the joining step S1, the magnet 1B, the first shaft body 11B, and the second shaft body 21B are less likely to be displaced in the direction intersecting the central axis A. Therefore, centerless polishing in the first processing step S2 is also facilitated.

Although the embodiments and modifications have been described above, the embodiments are not limited to the above embodiments. For example, in the above embodiment, in the first processing step S2, centerless polishing is performed in which the other bottom surface 13 of the first shaft body 11A and the other bottom surface 23 of the second shaft body 21A are not supported. However, depending on the conditions, in the first processing step S2, the other bottom surface 13 of the first shaft body 11A and the other bottom surface 23 of the second shaft body 21A may be supported.

1A,

1B Magnets

2, 3

Bottom

4, 5 Concavo-convex part 6 Side surface 7

Bolt hole part

11A, 11B

First shaft body

12, 13 Bottom surface 14 Concavo-convex part 16 Side surface 17

Bolt hole part

21A, 21B

Second shaft body

22, 23 Bottom surface 24 Concavo-convex part 26 Side surface 27 Bolt hole part 30 Adhesive 41 Support blade 42 Adjusting wheel 43 Grinding grind wheel 51 Armoring 52 Inner peripheral surface 53 Outer peripheral surface 60 Reference device 71 Bolt 72 Nut 100 Rotor A Central shaft S1 Joining process S2 1st Machining process S3 Fitting process S4 Second machining process

Claims

The magnet is formed by joining one bottom surface of the columnar first shaft body to one bottom surface of the columnar magnet and joining one bottom surface of the columnar second shaft body to the other bottom surface of the magnet. , The joining step of joining the first shaft body and the second shaft body to each other,
The magnet, the first shaft body, and the second shaft joined to each other in the joining step so that the side surfaces of the magnet, the first shaft body, and the second shaft body form the same cylindrical side surface. The first processing process to process each side of the body,
The side surface of the magnet, the side of the magnet on the side surface of the first shaft body, and the side of the magnet on the side surface of the second shaft body are covered with the armor ring while being in contact with the inner peripheral surface of the annular armor ring. Each side surface in the first processing step so that the side surface of the first shaft body opposite to the side of the magnet and the side surface of the second shaft body opposite to the side of the magnet are exposed from the armoring. The fitting step of fitting the armoring to the magnet, the first shaft body and the second shaft body, which have been machined.
The first shaft body exposed from the armoring of the magnet, the first shaft body, and the second shaft body to which the armor ring is fitted in the fitting step with reference to the outer peripheral surface of the armor ring. And the second processing step of processing the side surface of the second shaft body,
How to make a rotor with.
In the first processing step, the other bottom surface of the first shaft body and the other bottom surface of the second shaft body are supported while supporting the side surface of the magnet, the first shaft body, or the second shaft body. The method for manufacturing a rotor according to claim 1, wherein the side surfaces of the magnet, the first shaft body, and the second shaft body are machined without supporting the magnet.
In the joining process,
Concavo-convex portions provided on one bottom surface of the magnet and one bottom surface of the first axis body so as to limit mutual movement of the magnet and the central axis of the first axis body in a direction intersecting each other. One bottom surface of the first shaft body is joined to one bottom surface of the magnet while being fitted to each other.
Concavo-convex portions provided on the other bottom surface of the magnet and one bottom surface of the second axis body so as to limit each other's movement in the direction intersecting the central axis of the magnet and the second axis body. The method for manufacturing a rotor according to claim 1 or 2, wherein one bottom surface of the second shaft body is joined to the other bottom surface of the magnet while being fitted to each other.
In the joining process,
One bottom surface of the first shaft body is joined to one bottom surface of the magnet using an adhesive.
The method for manufacturing a rotor according to any one of claims 1 to 3, wherein one bottom surface of the second shaft body is joined to the other bottom surface of the magnet using an adhesive.