JP2024012730A - Manufacturing method of rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve precision of a rotor to be manufactured.

SOLUTION: In joining step S1, a bottom face 12 of a first shaft body 11A is joined to a bottom face 2 of a magnet 1A, and a bottom face 22 of a second shaft body 21A is joined to a bottom face 3 of the magnet 1A. In first processing step S2, respective side faces 6, 16 and 26 of the mutually joined magnet 1A, the first shaft body 11A and the second shaft body 21A are processed so that the respective side faces 6, 16 and 26 of the magnet 1A, the first shaft body 11A and the second shaft body 21A form side faces of the same cylinder. In fitting step S3, an armor ring 51 is fitted to the magnet 1A, the first shaft body 11A and the second shaft body 21A with the respective side faces 6, 16 and 26 processed. In second processing step S4, the side faces 16 and 26 of the first shaft body 11A and the second shaft body 21A, which are exposed from the armor ring 51 of the magnet 1A, the first shaft body 11A and the second shaft body 21A, to which the armor ring 51 is fitted, are processed with an outer peripheral face 53 of the armor ring 51 as a reference.

SELECTED DRAWING: Figure 4

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to a method for manufacturing a rotor.

Techniques for manufacturing rotors for electric motors have been proposed. For example, in the rotor manufacturing method disclosed in Patent Document 1, a shaft body whose shape has been finished in advance is joined to both bottom surfaces of a cylindrical magnet. The magnets and the two shaft bodies that are joined to each other by shrink fitting are bonded to each other by shrink fitting so that each side surface of the magnet and the two shaft bodies that are joined to each other is in contact with the inner peripheral surface of the annular armor ring and is covered by the armor ring. The armor ring is fitted.

Utility Model Application No. 62-119182

However, in the above manufacturing method, it is difficult to join the magnet and the two shaft bodies at both ends of the magnet so that their respective central axes are aligned. In the above manufacturing method, the accuracy with which the center axes of the magnet and the two shaft bodies are aligned depends on the accuracy of the shapes of the magnet and the two shaft bodies, and the accuracy of the alignment jig. Furthermore, in the above manufacturing method, the precision with which the side surfaces of the magnets and the two shaft bodies that are joined to each other coincide is low. Therefore, there is a possibility that the armor ring fitted to the magnet and the two shaft bodies does not have sufficient interference. As described above, in the above manufacturing method, the accuracy of the manufactured rotor is low.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotor manufacturing method that can improve the accuracy of the manufactured rotor.

One aspect of the present invention is that one bottom surface of a cylindrical first shaft body is joined to one bottom surface of a cylindrical magnet, and one bottom surface of a cylindrical second shaft body is joined to the other bottom surface of the magnet. By doing so, a joining process of joining the magnet, the first shaft body, and the second shaft body to each other, and a joining process such that the respective side surfaces of the magnet, the first shaft body, and the second shaft body form the side surfaces of the same cylinder. A first processing step of processing the respective side surfaces of the magnet, the first shaft body, and the second shaft body that are joined together in the process, and the side surface of the magnet, the magnet side of the side surface of the first shaft body, and the second shaft body The magnet side of the side surface is in contact with the inner peripheral surface of the annular armor ring and is covered with the armor ring, and the side surface of the first shaft body opposite to the magnet side and the side surface of the second shaft body opposite to the magnet side are A fitting process of fitting the armor ring to the magnet, the first shaft body, and the second shaft body whose respective sides were processed in the first processing process so that the opposite side is exposed from the armor ring, and the outer peripheral surface of the armor ring. A second process of processing the side surfaces of the first shaft body and the second shaft body exposed from the armor rings of the magnet, the first shaft body, and the second shaft body into which the armor ring was fitted in the fitting process, based on A method of manufacturing a rotor includes steps.

According to this configuration, in the first processing step, the magnets, which have already been joined to each other in the joining step, and 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 coincide after the first processing step does not depend on the precision of the steps before the joining step. Therefore, it is possible to improve the precision in which the side surfaces of the magnets, the first shaft body, and the second shaft body that are joined to each other match, and it is also possible to improve the precision in the interference of the armor ring that is fitted in the subsequent fitting process.

In addition, in the second processing step, the side surfaces of the first shaft body and the second shaft body among the magnets, the first shaft body, and the second shaft body that have already been joined to each other in the joining process are Processed. Therefore, the precision with which the center axes of the magnet, the first shaft body, and the second shaft body are aligned after the second processing does not depend on the precision of the process before the joining process. Therefore, the accuracy with which the central axes of the magnet, the first shaft body, and the second shaft body are aligned can be improved. As described above, according to this configuration, the accuracy of the manufactured rotor can be improved.

In this case, in the first processing step, while supporting either side of the magnet, the first shaft body, or the second shaft body, the other bottom surface of the first shaft body and the other bottom surface of the second shaft body are supported. Alternatively, the side surfaces of the magnet, the first shaft body, and the second shaft body may be processed.

According to this configuration, in the first processing step, one side of the magnet, the first shaft, and the second shaft is supported, but the other bottom surface of the first shaft and the other side of the second shaft are supported. The bottom surface is not supported, and each side surface of the magnet, first shaft body, and second shaft body is processed. Therefore, no force for support required for processing is applied to the joint between the magnet and the first shaft and the joint between the magnet and the second shaft. Therefore, damage to the joints in the first processing step can be reduced, and the yield of rotor manufacturing can be improved.

In addition, in the bonding process, unevenness is provided on one bottom surface of the magnet and one bottom surface of the first shaft body, respectively, so as to restrict mutual movement in a direction intersecting the central axis of the magnet and the first shaft body. one bottom surface of the first shaft body is joined to the bottom surface of one side of the magnet while the parts are fitted into each other, and the magnets are arranged so as to limit mutual movement in a direction intersecting the central axes of the magnet and the second shaft body. One bottom surface of the second shaft 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 shaft body are fitted into each other.

According to this configuration, in the bonding process, one bottom surface of the magnet and one bottom surface of the first shaft body are attached to each other so as to restrict mutual movement in a direction intersecting the central axis of the magnet and the first shaft body. The provided uneven portions are fitted into each other, and one bottom surface of the first shaft body is joined to one bottom surface of the magnet, thereby restricting mutual movement of the magnet and the second shaft body in a direction intersecting the central axis. The concavo-convex portions provided on the other bottom surface of the magnet and the one bottom surface of the second shaft body are fitted together so that one bottom surface of the second shaft body is joined to the other bottom surface of the magnet. . This makes it difficult for the magnet, the first shaft body, and the second shaft body to shift in the direction intersecting the central axis after the joining process.

In addition, in the bonding process, one bottom surface of the first shaft body is bonded to one bottom surface of the magnet using an adhesive, and one bottom surface of the second shaft body is bonded to the other bottom surface of the magnet using an adhesive. You may.

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

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

FIG. 3 is a longitudinal cross-sectional view showing a magnet, a first shaft, and a second shaft in the rotor manufacturing method according to the first embodiment. FIG. 3 is a longitudinal cross-sectional view showing a joining step in the rotor manufacturing method according to the first embodiment. FIG. 3 is a longitudinal cross-sectional view showing a first processing step in the rotor manufacturing method according to the first embodiment. FIG. 3 is a longitudinal cross-sectional view showing a fitting step in the rotor manufacturing method according to the first embodiment. FIG. 7 is a longitudinal cross-sectional view showing a second processing step in the rotor manufacturing method according to the first embodiment. FIG. 7 is a longitudinal cross-sectional view showing a joining step in the rotor manufacturing method according to the second embodiment.

Hereinafter, embodiments will be described with reference to the drawings. As shown in FIG. 1, in the rotor manufacturing method of this embodiment, a magnet 1A, a first shaft 11A, and a second shaft 21A are prepared. The magnet 1A is a cylindrical 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 a bottom surface 2 and a bottom surface 3.

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

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

The shapes of the uneven parts 4, 5, 14, and 24 are such that when they fit into each other, they limit the mutual movement of the magnet 1A, the first shaft body 11A, and the second shaft body 21A in the direction intersecting the central axis A. Any shape is acceptable. For example, in the example shown in FIG. 1, the uneven portions 4 and 5 of the magnet 1A protrude in the direction parallel to the central axis A at the center portions of the bottom surfaces 2 and 3, and extend along the central axis A 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 on the bottom surface 12 of the first shaft body 11A and the uneven portion 24 on the bottom surface 22 of the second shaft body 21A are recessed in the center of each of the bottom surfaces 12, 22 in a direction parallel to the central axis A, The bottom surfaces 12 and 22 each have a shape that protrudes in a direction parallel to the central axis A at their peripheral edges. In addition, the shape of the uneven parts 4, 5, 14, and 24 is such that when they fit together, the magnet 1A, the first shaft body 11A, and the second shaft body 21A move in the direction of rotation around the central axis A. may be restricted.

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

In the bonding step S1, one bottom surface 2 of the magnet 1A and one bottom surface 12 of the first shaft body 11A are bonded so as to limit mutual movement of the magnet 1A and the first shaft body 11A in the direction intersecting the central axis A. One bottom surface 12 of the first shaft body 11A is joined to one bottom surface 2 of the magnet 1A while the concavo-convex portions 4 and 14 provided thereon are fitted into each other. In addition, in the bonding step S1, the other bottom surface 3 of the magnet 1A and one bottom surface of the second shaft 21A are limited so as to limit mutual movement in the direction intersecting the central axis A of the magnet 1A and the second shaft 21A. One bottom surface 22 of the second shaft body 21A is joined to the other bottom surface 3 of the magnet 1A while the concavo-convex portions 5 and 24 provided on each of the magnets 22 are fitted into each other.

In addition, in the bonding step S1, one bottom surface 12 of the first shaft body 11A is bonded to one bottom surface 2 of the magnet 1A using the adhesive 30, and the second bottom surface 12 of the first shaft body 11A is bonded to the other bottom surface 3 of the magnet 1A using the adhesive 30. One bottom surface 22 of the biaxial body 21A is joined. For example, a thermosetting epoxy adhesive can be used as the adhesive 30.

As shown in FIG. 3, the first processing step S2 is performed on the magnet 1A, the first shaft body 11A, and the second shaft body 21A that were joined together in the joining step S1. In the first processing step S2, the magnets are bonded to each other in the bonding step S1 so that the respective side surfaces 6, 16, and 26 of the magnet 1A, the first shaft body 11A, and the second shaft body 21A form the side surfaces of the same cylinder. 1A, the respective side surfaces 6, 16, and 26 of the first shaft body 11A and the second shaft body 21A are processed. Therefore, after the first processing step S2, the magnet 1A, the first shaft body 11A, and the second shaft body 21A, which were 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. form two cylinders.

In the first processing step S2, while the side surfaces 6, 16, 26 of the magnet 1A, the first shaft 11A, and the second shaft 21A are supported, the other bottom surface 13 of the first shaft 11A and the second shaft are supported. The respective side surfaces 6, 16, and 26 of the magnet 1A, the first shaft 11A, and the second shaft 21A are processed without the other bottom surface 23 of the body 21A being supported. That is, the first processing step S2 is performed by centerless polishing. In centerless polishing, the magnet 1A, the first shaft body 11A, and the second shaft body 21A, which are joined to each other, are supported from below by the support blade 41 between the adjustment wheel 42 and the grinding wheel 43. By rotating the adjustment wheel 42 and the grinding wheel 43, the rotations of the magnet 1A, the first shaft body 11A, and the second shaft body 21A, which are joined to each other, are adjusted, and the magnet 1A, the first shaft body 11A, and the second shaft body are rotated. Each side surface 6, 16, 26 of the body 21A is processed.

As shown in FIG. 4, the fitting step S3 is performed on the magnet 1A, the first shaft body 11A, and the second shaft body 21A whose respective side surfaces 6, 16, and 26 have been processed in the first processing step S2. . In the fitting step S3, the side surface 6 of the magnet 1A, the side surface 16 of the first shaft body 11A on the magnet 1A side, and the side surface 26 of the second shaft body 21A on the magnet 1A side are the inner peripheral surface 52 of the annular armor ring 51. The side surface 16 of the first shaft body 11A opposite to the magnet 1A side and the side surface 26 of the second shaft body 21A opposite to the magnet 1A side are exposed from the armor ring 51. As such, the armor ring 51 is fitted to the magnet 1A, the first shaft 11A, and the second shaft 21A whose respective side surfaces 6, 16, and 26 have been processed in the first processing step S2.

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

As shown in FIG. 5, the second processing step S4 is performed on the magnet 1A, the first shaft body 11A, and the second shaft body 21A into which the armor ring 51 was fitted in the fitting step S3. In the second processing step S4, the outer circumferential surface 53 of the armor ring 51 is used as a reference (reference surface, datum), and the magnet 1A, the first shaft body 11A, and the armor ring 51 fitted in the fitting step S3 are The side surfaces 16 and 26 of the first shaft body 11A and the second shaft body 21A exposed from the armor ring 51 of the second shaft body 21A are processed.

In the second machining step S4, the side surfaces 16 and 26 of the first shaft body 11A and the second shaft body 21A exposed from the armor ring 51 are aligned with the outer peripheral surface 53 using the reference device 60 or the like as a reference. The side surfaces 16, 26 are machined so as to be spaced a certain distance from the surface. After the second processing step S4, each of the side surface 16 of the first shaft body 11A and the side surface 26 of the second shaft body 21A exposed from the armor ring 51 forms a side surface of a cylinder having a common central axis A. The rotor 100 of the electric motor is manufactured in the manner described above.

In this embodiment, in the first processing step S2, the bonding step S2 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 side surfaces of the same cylinder. The respective side surfaces 6, 16, and 26 of the magnet 1A, the first shaft body 11A, and the second shaft body 21A that are joined to each other are processed. Therefore, the precision with which the side surfaces 6, 16, and 26 of the magnet 1A, the first shaft body 11A, and the second shaft body 21A match after the first processing step S2 does not depend on the precision of the steps before the joining step S1. Therefore, it is possible to improve the precision in which the side surfaces 6, 16, and 26 of the magnet 1A, the first shaft body 11A, and the second shaft body 21A that are joined to each other are aligned with each other, and the armor ring is fitted in the subsequent fitting step S3. The accuracy of the tightening margin of 51 can also be improved. In other words, in this embodiment, the interference can be easily controlled.

In the second processing step S4, the side surfaces 16 of the first shaft body 11A and the second shaft body 21A among the magnet 1A, the first shaft body 11A, and the second shaft body 21A that have already been joined to each other in the joining step S1, 26 is processed using the outer peripheral surface 53 of the armor ring 51 as a reference. Therefore, the precision with which the central axes A of the magnet 1A, the first shaft body 11A, and the second shaft body 21A match after the second processing does not depend on the precision of the process before the joining process S1. Therefore, the accuracy with which the central axes A of the magnet 1A, the first shaft body 11A, and the second shaft body 21A are aligned can be improved. As described above, according to this embodiment, the accuracy of the manufactured rotor 100 can be improved. Further, according to this embodiment, the yield of manufacturing the rotor 100 can also be improved.

Further, according to the present embodiment, in the first processing step S2, the side surfaces 6, 16, and 26 of any one of the magnet 1A, the first shaft body 11A, and the second shaft body 21A are supported, but the first shaft body The other bottom surface 13 of the magnet 11A and the other bottom surface 23 of the second shaft body 21A are not supported, and the respective side surfaces 6, 16, and 26 of the magnet 1A, the first shaft body 11A, and the second shaft body 21A are processed. Ru. Therefore, the joints between the magnet 1A and the first shaft body 11A (bottom surfaces 2, 12) and the joints between the magnet 1A and the second shaft body 21A (bottom surfaces 3, 22) are provided with support necessary for processing. No force is applied. Therefore, damage to the joints joined by the adhesive 30 in the first processing step S2 can be reduced, and the manufacturing yield of the rotor 100 can be improved.

Further, according to the present embodiment, in the bonding step S1, one bottom surface 2 of the magnet 1A and the first The concavo-convex portions 4 and 14 provided on one bottom surface 12 of the shaft body 11A are fitted together, and one bottom surface 12 of the first shaft body 11A is joined to one bottom surface 2 of the magnet 1A. and an uneven portion provided on the other bottom surface 3 of the magnet 1A and the one bottom surface 22 of the second shaft body 21A so as to restrict mutual movement in the direction intersecting the central axis A of the second shaft body 21A. 5 and 24 are fitted into 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. This makes it difficult for the magnet 1A, the first shaft body 11A, and the second shaft body 21A to shift in the direction intersecting the central axis A after the joining step S1.

Further, according to the present embodiment, the magnet 1A, the first shaft body 11A, and the second shaft body 21A are difficult to shift in the direction intersecting the central axis A due to the forces from the side surfaces 6, 16, and 26, so Centerless polishing in one processing step S2 is also facilitated.

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

A second embodiment of the present invention will be described below. As shown in FIG. 6, in this embodiment, the magnet 1B does not have uneven portions 4 and 5 on the bottom surfaces 2 and 3, and the bottom surfaces 2 and 3 are uniform planes. Further, the first shaft body 11B does not have an uneven portion 14 on the bottom surface 12, and the second shaft body 21B does not have an uneven portion 24 on the bottom surface 22, and the bottom surfaces 12 and 22 are uniform planes. be. Further, the adhesive 30 is not used in the bonding step S1.

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, a bolt 71 is inserted into each of the bolt holes 7, 17, and 27, and a nut 72 is screwed onto one end of the bolt 71. The first processing step S2, the fitting step S3, and the second processing step S4 after the joining step S1 are performed in the same manner as in the first embodiment. After the fitting step S3, the bolt 71 and nut 72 may be removed from the bolt holes 7, 17, and 27.

According to this embodiment, the uneven portions 4, 5, 14, 24 are not provided on the bottom surfaces 2, 3, 12, 22 of the magnet 1B, the first shaft 11B, and the second shaft 21B, 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 performed. Further, according to the present embodiment, each of the magnet 1B, the first shaft body 11B, and the second shaft body 21B is difficult to shift in the direction intersecting the central axis A after the joining step S1. Therefore, centerless polishing in the first processing step S2 is also facilitated.

Although the embodiments and modified examples have been described above, the embodiments are not limited to the above embodiments. For example, in the embodiment described above, in the first processing step S2, centerless polishing was 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 were not supported. However, depending on conditions, 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 in the first processing step S2.

1A, 1B Magnet 2, 3 Bottom surface 4, 5 Concave and convex portion 6 Side surface 7 Bolt hole portion 11A, 11B First shaft body 12, 13 Bottom surface 14 Concave and convex portion 16 Side surface 17 Bolt hole portion 21A, 21B Second shaft body 22, 23 Bottom surface 24 Uneven part 26 Side surface 27 Bolt hole 30 Adhesive 41 Support blade 42 Adjustment wheel 43 Grinding wheel 51 Armor ring 52 Inner circumferential surface 53 Outer circumferential surface 60 Reference device 71 Bolt 72 Nut 100 Rotor A Central axis S1 Joining process S2 First Processing process S3 Fitting process S4 Second processing process

Claims (4)

By joining one bottom surface of a cylindrical first shaft body to one bottom surface of a cylindrical magnet, and joining one bottom surface of a cylindrical second shaft body to the other bottom surface of the magnet, the magnet , a joining step of joining the first shaft body and the second shaft body to each other;
The magnet, the first shaft, and the second shaft are joined to each other in the joining step such that the side surfaces of the magnet, the first shaft, and the second shaft form the side surfaces of the same cylinder. a first processing step of processing each side of the body;
A side surface of the magnet, a side surface of the first shaft body on the magnet side, and a side surface of the second shaft body on the magnet side are covered by the armor ring while being in contact with the inner peripheral surface of the annular armor ring, and In the first processing step, each side surface is exposed from the armor ring so that the side surface of the first shaft body opposite to the magnet side and the side surface of the second shaft body opposite to the magnet side are exposed from the armor ring. a fitting step of fitting the armor ring to the processed magnet, the first shaft body, and the second shaft body;
The first shaft body exposed from the armor ring of the magnet, the first shaft body, and the second shaft body into which the armor ring was fitted in the fitting process, with the outer peripheral surface of the armor ring as a reference. and a second processing step of processing a side surface of the second shaft body;
A method for manufacturing a rotor with. In the first processing step, while supporting one side of the magnet, the first shaft, and the second shaft, the other bottom surface of the first shaft and the other bottom surface of the second shaft are supported. 2. The method for manufacturing a rotor according to claim 1, wherein each side surface of the magnet, the first shaft, and the second shaft is processed without supporting the magnet. In the joining step,
An uneven portion is provided on one bottom surface of the magnet and one bottom surface of the first shaft body so as to limit mutual movement of the magnet and the first shaft body in a direction intersecting the central axis. joining one bottom surface of the first shaft body to one bottom surface of the magnet while fitting each other;
An uneven portion is provided on the other bottom surface of the magnet and on one bottom surface of the second shaft body so as to limit mutual movement of the magnet and the second shaft body in a direction intersecting the central axis. 3. The method for manufacturing a rotor according to claim 1, wherein one bottom surface of the second shaft is joined to the other bottom surface of the magnet while being fitted together. In the joining step,
bonding one bottom surface of the first shaft body to one bottom surface of the magnet using an adhesive;
4. The method for manufacturing a rotor according to claim 1, wherein one bottom surface of the second shaft body is joined to the other bottom surface of the magnet using an adhesive.

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