JP2015186298A - rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique that more securely inhibit buckling of a rotor core in its axial direction when the rotor core is attached to a shaft by being baked and fitted thereon.SOLUTION: A rotor 7 comprises a shaft 6 and a rotor core 5 composed of a plurality of steel plates 11 arranged in layers in its axial direction, the rotor core 5 being attached to the shaft 6 by being baked and fitted thereon. A plurality of magnetic holding holes 14 for holding permanent magnets 13 are formed in the rotor core 5, near its outer periphery. The rotor core 5 is provided with a plurality of first coupling parts 15 and a plurality of second coupling parts 16 for coupling axially adjacent steel plates 11, closer to the inner periphery than the magnetic holding holes 14. Each first coupling part 15 is formed near the inner periphery 17 of the rotor core 5. Each second coupling part 16 is formed nearer to the outer periphery than each first coupling part 15. Each second coupling part 16 is formed D/2 or more apart from the inner periphery 17 of the rotor core 5.

Description

  The present invention relates to a rotor.

  Generally, the rotor is composed of a rotor core and a shaft. The rotor core is formed by laminating a plurality of steel plates in the axial direction in order to reduce eddy current loss. As a method for fastening the rotor core and the shaft, so-called shrink fitting is widely known in which the rotor core is heated to temporarily enlarge the inner diameter of the rotor core, and after inserting the shaft into the rotor core, the rotor core is cooled and contracted.

  In this method, when the rotor core is cooled and contracted, a high stress is generated on the rotor core in the radially outward direction. If this stress exceeds the elastic limit of the rotor core, the rotor core may buckle in the axial direction. If the rotor core buckles in the axial direction in this way, the rotor core cannot tighten the shaft with a desired pressure.

  Therefore, in Patent Document 1, steel plates adjacent in the axial direction are welded to each other on the inner peripheral surface of the rotor core. According to this, since the out-of-plane rigidity of the rotor core is increased, the axial buckling of the rotor core can be prevented. Here, the “out-of-plane rigidity” is the rigidity of the rotor core in the axial direction.

Japanese Patent Laid-Open No. 2001-259689

  By the way, the rotor core is formed with a plurality of magnet holding holes for holding the permanent magnets. The plurality of magnet holding holes are formed near the outer periphery of the rotor core. The reason why the plurality of magnet holding holes are formed near the outer periphery of the rotor core is to first bring the permanent magnet closer to the stator, and secondly, by separating the plurality of magnet holding holes from the inner peripheral surface of the rotor core. This is because a region having high in-plane rigidity is formed between the plurality of magnet holding holes and the inner peripheral surface of the rotor core, and the presence of this region realizes a strong clamping force for the shaft of the rotor core. The “in-plane rigidity” is the rigidity of the rotor core in the direction orthogonal to the axial direction.

  As a result of intensive studies by the inventors of the present application, even in a rotor core to which the technique of Patent Document 1 is applied, as shown in FIG. Sometimes it buckled in the axial direction.

  An object of the present invention is to provide a technique for more reliably suppressing buckling of the rotor core in the axial direction when the rotor core is attached to the shaft by shrink fitting.

According to an aspect of the present invention, there is provided a rotor comprising a shaft and a rotor core configured by laminating a plurality of steel plates in the axial direction, and the rotor core is attached to the shaft by shrink fitting. A plurality of magnet holding holes for holding a permanent magnet are formed near the outer periphery, and the steel plates adjacent in the axial direction are coupled to the rotor core on the inner peripheral side from the plurality of magnet holding holes. A first coupling portion and a second coupling portion are provided, wherein the first coupling portion is formed in the vicinity of an inner peripheral surface of the rotor core, and the second coupling portion is more than the first coupling portion. It is formed on the outer peripheral side, and when the distance in the radial direction from the inner peripheral surface of the rotor core to the plurality of magnet holding holes is D, it is formed at a position away from the inner peripheral surface of the rotor core by D / 2 or more. Has been A rotor is provided. According to the above configuration, the out-of-plane rigidity of the inner peripheral region of the rotor core is higher than that of the plurality of magnet holding holes. Accordingly, it is possible to more reliably suppress the axial buckling of the rotor core when the rotor core is attached to the shaft by shrink fitting.
The first coupling portion is formed by any one of caulking, welding on the inner peripheral surface of the rotor core, or welding on an inner peripheral surface of an inner welding through hole formed so as to penetrate in the axial direction. Yes.
The second coupling part is formed by either caulking or welding on the inner peripheral surface of the inner welding through hole formed so as to penetrate in the axial direction.
The first coupling portion and the second coupling portion are formed at a plurality of locations in the circumferential direction, and are formed at different positions in the circumferential direction.

  According to the present invention, the out-of-plane rigidity of the inner peripheral region of the rotor core is higher than that of the plurality of magnet holding holes. Accordingly, it is possible to more reliably suppress the axial buckling of the rotor core when the rotor core is attached to the shaft by shrink fitting.

It is sectional drawing of a motor. (First embodiment) It is a disassembled perspective view of a rotor. (First embodiment) It is a top view of a rotor core. (First embodiment) It is a partial enlarged plan view of a rotor core. (First embodiment) It is the VV sectional view taken on the line of FIG. (First embodiment) It is sectional drawing of a rotor for demonstrating the effect of this embodiment. It is a partial enlarged plan view of a rotor core. (Second Embodiment) It is the VIII-VIII sectional view taken on the line of FIG. (Second Embodiment) It is a partial enlarged plan view of a rotor core. (Third embodiment) It is a partial enlarged plan view of a rotor core. (Fourth embodiment) It is a partial enlarged plan view of a rotor core. (Fifth embodiment) It is a partial enlarged plan view of a rotor core. (Fifth embodiment) It is sectional drawing of a rotor for demonstrating the problem of patent document 1. FIG.

(First embodiment)
As shown in FIG. 1, a motor 1 (rotary electric machine) is used by being mounted on a vehicle such as a hybrid vehicle or an electric vehicle, for example, and has a stator core 2 and a three-phase stator coil 3 and an armature. A stator 4 (stator) that functions as a rotor, a rotor 7 (rotor) that has a rotor core 5 and a shaft 6 as a rotating shaft, and functions as a field, and a stator 4 and the rotor 7 that are housed and connected by fastening bolts A housing 8 and a rear housing 9 are included. The stator 4 is disposed on the outer peripheral side of the rotor 7.

  As shown in FIG. 2, a pair of key grooves 10 extending in the axial direction are formed on the outer peripheral surface 6 a of the shaft 6.

  The rotor core 5 is configured by laminating a plurality of annular steel plates 11 in the axial direction. As shown in FIGS. 2 and 3, the rotor core 5 includes a shaft insertion hole 12 into which the shaft 6 is inserted, a plurality of magnet holding holes 14 for holding a plurality of permanent magnets 13, and a plurality of first coupling portions. 15 and a plurality of second coupling portions 16. The rotor core 5 has an inner peripheral surface 17 and an outer peripheral surface 18. The inner peripheral surface 17 of the rotor core 5 corresponds to the inner peripheral surface of the shaft insertion hole 12.

  As shown in FIG. 2, a pair of keys 19 extending in the axial direction is formed on the inner peripheral surface 17 of the rotor core 5. The pair of keys 19 are inserted into the pair of key grooves 10 of the shaft 6 when the rotor core 5 is attached to the shaft 6.

  As shown in FIG. 3, the plurality of magnet holding holes 14 are formed near the outer periphery of the rotor core 5. The plurality of magnet holding holes 14 are formed in the vicinity of the outer peripheral surface 18 of the rotor core 5. In the plan view shown in FIG. 3, the plurality of magnet holding holes 14 are formed in a long hole shape. In the plan view shown in FIG. 3, the plurality of magnet holding holes 14 are formed to be inclined with respect to the radial direction of the rotor core 5. Specifically, in a plan view shown in FIG. 3, the pair of magnet holding holes 14 adjacent in the circumferential direction of the rotor core 5 are formed to be inclined with respect to the radial direction of the rotor core 5 so as to be opposite to each other. . In the present embodiment, the d-axis is set between the pair of magnet holding holes 14 that are inclined with respect to the radial direction of the rotor core 5 so as to be separated from each other toward the outer peripheral surface 18 of the rotor core 5. A q-axis is set between a pair of magnet holding holes 14 that are inclined with respect to the radial direction of the rotor core 5 so as to approach each other.

  As shown in FIG. 3, a high in-plane rigidity region 20 with high in-plane rigidity is formed between the inner peripheral surface 17 of the rotor core 5 and the plurality of magnet holding holes 14. On the outer peripheral side of the high in-plane rigidity region 20, a low in-plane rigidity region 21 with low in-plane rigidity is formed. The low in-plane rigidity region 21 has a plurality of magnet holding holes 14 so that the in-plane rigidity is low.

  As shown in FIG. 3, the plurality of first coupling portions 15 and the plurality of second coupling portions 16 are disposed between the inner peripheral surface 17 of the rotor core 5 and the plurality of magnet holding holes 14. That is, the plurality of first coupling portions 15 and the plurality of second coupling portions 16 are disposed in the high in-plane rigidity region 20.

  As shown in FIG. 3, the plurality of first coupling portions 15 are arranged on the same circle. The plurality of first coupling portions 15 are disposed in the vicinity of the inner peripheral surface 17 of the rotor core 5. The plurality of first coupling portions 15 are formed slightly away from the inner peripheral surface 17 of the rotor core 5 toward the outer peripheral side. The plurality of first coupling portions 15 are arranged at equal intervals in the circumferential direction of the rotor core 5. Each first coupling portion 15 is disposed on the d-axis.

  As shown in FIG. 3, the plurality of second coupling portions 16 are arranged on the same circle. The plurality of second coupling portions 16 are arranged on the outer peripheral side with respect to the plurality of first coupling portions 15. The plurality of second coupling portions 16 are arranged at equal intervals in the circumferential direction of the rotor core 5. Each second coupling portion 16 is disposed on the q axis. The second coupling portions 16 are arranged so as to approach each other toward the outer peripheral surface 18 of the rotor core 5 so as not to affect the magnetic flux formed by the plurality of permanent magnets 13 as much as possible, that is, not to increase the vortex loss. Arranged on the q axis between a pair of magnet holding holes 14 inclined with respect to the radial direction of the rotor core 5. The plurality of second coupling portions 16 are arranged on the inner peripheral side of the rotor core 5 with respect to the plurality of magnet holding holes 14.

  Here, as shown in FIG. 3, D is the distance in the radial direction from the inner peripheral surface 17 of the rotor core 5 to the plurality of magnet holding holes 14. Strictly speaking, the distance D is a distance in the radial direction from the inner peripheral surface 17 of the rotor core 5 to the inner peripheral ends 14 a of the plurality of magnet holding holes 14. The plurality of first coupling portions 15 are disposed at positions separated from the inner peripheral surface 17 of the rotor core 5 by less than D / 2. The plurality of second coupling portions 16 are disposed at positions separated from the inner peripheral surface 17 of the rotor core 5 by D / 2 or more.

  Each first coupling portion 15 is a portion that couples the steel plates 11 adjacent in the axial direction. Similarly, each 2nd coupling | bond part 16 is a part which couple | bonds the steel plates 11 adjacent to an axial direction.

  With reference to FIG.4 and FIG.5, each 1st coupling | bond part 15 is demonstrated concretely. As shown in FIGS. 4 and 5, the rotor core 5 has a perfect circular inner weld through hole 25 penetrating in the axial direction. And each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to the axial direction in the inner peripheral surface 25a of the inner side welding through-hole 25. As shown in FIG. Each first coupling portion 15 is formed by welding the steel plates 11 adjacent to each other in the axial direction on the side closer to the inner peripheral surface 17 of the rotor core 5 in the inner peripheral surface 25 a of the inner welding through hole 25. Each first coupling portion 15 is formed as a solidified product obtained by partially melting and solidifying a plurality of steel plates 11. As shown in FIG. 5, each 1st coupling | bond part 15 is extended in the axial direction, and is formed in the rod shape. As shown in FIG. 4, when the distance in the radial direction between the inner circumferential surface 17 of the rotor core 5 and each first coupling portion 15 is E, and the dimension in the radial direction of each first coupling portion 15 is F, each first The 1 coupling | bond part 15 is arrange | positioned so that E> F may be materialized.

  Next, each 2nd coupling | bond part 16 is demonstrated concretely. As shown in FIG. 3, the rotor core 5 has a perfect circular outer weld through hole 26 that penetrates in the axial direction. And each 2nd coupling | bond part 16 is formed by welding the steel plates 11 adjacent to an axial direction in the inner peripheral surface 26a of the outer side welding through-hole 26. As shown in FIG. Each second coupling portion 16 is formed as a solidified product obtained by partially melting and solidifying the plurality of steel plates 11. Each second coupling portion 16 extends in the axial direction and is formed in a rod shape.

  Although the first embodiment has been described above, the first embodiment has the following features.

  The rotor 7 includes a shaft 6 and a rotor core 5 configured by laminating a plurality of steel plates 11 in the axial direction, and the rotor core 5 is attached to the shaft 6 by shrink fitting. Near the outer periphery of the rotor core 5, a plurality of magnet holding holes 14 for holding the permanent magnets 13 are formed. The rotor core 5 is provided with a plurality of first coupling portions 15 and a plurality of second coupling portions 16 that couple the steel plates 11 adjacent in the axial direction on the inner peripheral side with respect to the plurality of magnet holding holes 14. Each first coupling portion 15 is formed in the vicinity of the inner peripheral surface 17 of the rotor core 5. Each second coupling portion 16 is formed on the outer peripheral side of each first coupling portion 15. Each second coupling portion 16 is formed at a position separated from the inner peripheral surface 17 of the rotor core 5 by D / 2 or more. According to the above configuration, the out-of-plane rigidity of the high in-plane rigidity region 20 is increased as shown in FIG. Therefore, when the rotor core 5 is attached to the shaft 6 by shrink fitting, the buckling in the axial direction of the high in-plane rigidity region 20 of the rotor core 5 can be more reliably suppressed.

  The rotor core 5 has a plurality of inner weld through holes 25 penetrating in the axial direction. Each first coupling portion 15 is formed by welding the steel plates 11 adjacent to each other in the axial direction on the inner peripheral surface 25 a of each inner welding through-hole 25. That is, when the rotor core 5 contracts, a circumferential tensile stress is generated on the inner peripheral surface 17 of the rotor core 5, and if this tensile stress acts on the first coupling portion 15, the first coupling portion 15 may be broken. is there. Therefore, according to the above configuration, since the first coupling portion 15 is formed at a position away from the inner circumferential surface 17 of the rotor core 5, the circumferential tensile stress acting on the first coupling portion 15 is reduced, Therefore, destruction of the 1st coupling | bond part 15 can be avoided.

  In the low in-plane rigidity region 21, since the in-plane rigidity is low, the rotor core 5 is easily deformed in the circumferential direction and the radial direction, and high stress is generated that causes the low in-plane rigidity region 21 to buckle in the axial direction. Never do.

  In the first embodiment, since the plurality of first coupling portions 15 and the plurality of second coupling portions 16 are arranged at equal intervals in the circumferential direction of the rotor core 5, the effect of suppressing the buckling is the circumference of the rotor core 5. Uniform in the direction.

  Moreover, as shown in FIG.1 and FIG.3, the 1st coupling | bond part 15 and the 2nd coupling | bond part 16 are each formed in multiple places in the circumferential direction. Moreover, the 1st coupling | bond part 15 and the 2nd coupling | bond part 16 are formed so that it may become a different position in the circumferential direction. Specifically, as shown in FIGS. 1 and 3, the first coupling portion 15 and the second coupling portion 16 are arranged in a staggered manner. When viewed from the central axis of the rotor core 5, the first coupling portion 15 and the second coupling portion 16 are located in different directions. According to the above configuration, it is possible to suppress the in-plane rigidity of the rotor core 5 from being reduced by forming the first coupling portion 15 and the second coupling portion 16.

  In the said 1st Embodiment, each 1st coupling | bond part 15 is formed so that E> F may be materialized. In this way, by separating each first coupling portion 15 from the inner peripheral surface 17 of the rotor core 5 to some extent, it is possible to avoid the occurrence of a large circumferential tensile stress in each first coupling portion 15.

  The first embodiment can be modified as follows.

  As shown in FIG. 4, in the first embodiment, the rotor core 5 has a perfect circular inner weld through hole 25 penetrating in the axial direction. And each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to the axial direction in the inner peripheral surface 25a of the inner side welding through-hole 25. As shown in FIG. However, instead of this, similarly to Patent Document 1, the first coupling portions 15 may be formed by welding the steel plates 11 adjacent in the axial direction on the inner peripheral surface 17 of the rotor core 5. According to the above configuration, since the procedure for forming the inner weld through hole 25 can be omitted, each first coupling portion 15 can be formed at a low cost. Even in this case, it can be said that each first coupling portion 15 is formed in the vicinity of the inner peripheral surface 17 of the rotor core 5.

  Moreover, in the said 1st Embodiment, each 1st coupling part 15 is formed by welding the steel plates 11 adjacent to an axial direction. However, instead of this, each first coupling portion 15 may be formed by caulking such as dowel caulking or eyelet. According to the above configuration, since the welding process can be omitted, each first coupling portion 15 can be formed at low cost. The same applies to each second coupling portion 16.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.

  As shown in FIG. 4, in the first embodiment, each of the first coupling portions 15 connects the steel plates 11 adjacent in the axial direction to the inner peripheral surface of the rotor core 5 out of the inner peripheral surface 25 a of the inner weld through hole 25. It is formed by welding on the side close to 17. Moreover, as shown in FIG. 5, each 1st coupling | bond part 15 is extended in the axial direction, and is formed in the rod shape.

  On the other hand, in this embodiment, as shown in FIG. 7, each first coupling portion 15 welds the steel plates 11 adjacent to each other in the axial direction on the entire circumference of the inner circumferential surface 25 a of the inner welding through-hole 25. It is formed by that. Moreover, as shown in FIG. 8, each 1st coupling | bond part 15 is extended in the axial direction, and is formed in the cylinder shape.

(Third embodiment)
Next, a third embodiment will be described with reference to FIG.

  As shown in FIG. 4, in the first embodiment, each of the first coupling portions 15 connects the steel plates 11 adjacent in the axial direction to the inner peripheral surface of the rotor core 5 out of the inner peripheral surface 25 a of the inner weld through hole 25. It is formed by welding on the side close to 17.

  On the other hand, in this embodiment, as shown in FIG. 9, each first coupling portion 15 connects the steel plates 11 adjacent to each other in the axial direction within the rotor core 5 of the inner peripheral surface 25 a of the inner welding through hole 25. It is formed by welding on the side far from the peripheral surface 17. According to the above structure, each 1st coupling part 15 is compared with the case where it forms in the side close | similar to the internal peripheral surface 17 of the rotor core 5 among the internal peripheral surfaces 25a of the inner side welding through-hole 25, respectively. 15 is formed at a position further away from the inner peripheral surface 17 of the rotor core 5, the circumferential tensile stress acting on each first coupling portion 15 is further reduced, thereby causing the destruction of each first coupling portion 15. This can be avoided more reliably. Further, since the inner weld through hole 25 exists on the inner peripheral surface 17 side of the rotor core 5 when viewed from each first coupling portion 15, the region on the inner peripheral surface 17 side of the rotor core 5 when viewed from each first coupling portion 15. The in-plane rigidity is locally reduced, so that the circumferential tensile stress acting on each first coupling portion 15 is further reduced, and the breakage of each first coupling portion 15 can be avoided more reliably.

(Fourth embodiment)
Next, a fourth embodiment will be described with reference to FIG.

  As shown in FIG. 4, in the first embodiment, the rotor core 5 has a perfect circular inner weld through hole 25 penetrating in the axial direction. And each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to the axial direction in the inner peripheral surface 25a of the inner side welding through-hole 25. As shown in FIG. Each first coupling portion 15 is formed by welding the steel plates 11 adjacent to each other in the axial direction on the side closer to the inner peripheral surface 17 of the rotor core 5 in the inner peripheral surface 25 a of the inner welding through hole 25.

  On the other hand, in this embodiment, as shown in FIG. 10, the rotor core 5 has an elliptical inner weld through hole 25 penetrating in the axial direction. The inner weld through hole 25 is formed elongated along the radial direction of the rotor core 5. The major axis of the inner weld through hole 25 is parallel to the radial direction of the rotor core 5. And each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to the axial direction in the inner peripheral surface 25a of the inner side welding through-hole 25. As shown in FIG. Each first coupling portion 15 is formed by welding the steel plates 11 adjacent in the axial direction on the side farther from the inner peripheral surface 17 of the rotor core 5 in the inner peripheral surface 25a of the inner welding through hole 25. According to the above configuration, the in-plane rigidity in the circumferential direction on the inner peripheral surface 17 side of the rotor core 5 as viewed from each first coupling portion 15 is further reduced, and thus the circumferential force acting on each first coupling portion 15 is reduced. The tensile stress in the direction is further reduced, and the breakage of each first coupling portion 15 can be avoided more reliably.

  In the fourth embodiment, the rotor core 5 has the elliptical inner weld through hole 25 penetrating in the axial direction. However, the inner weld through hole 25 may have a long hole shape.

(Fifth embodiment)
Next, a fifth embodiment will be described with reference to FIGS. 11 and 12.

  As shown in FIG. 4, in the first embodiment, the rotor core 5 has a perfect circular inner weld through hole 25 penetrating in the axial direction. And each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to the axial direction in the inner peripheral surface 25a of the inner side welding through-hole 25. As shown in FIG. Each first coupling portion 15 is formed by welding the steel plates 11 adjacent to each other in the axial direction on the side closer to the inner peripheral surface 17 of the rotor core 5 in the inner peripheral surface 25 a of the inner welding through hole 25.

  On the other hand, in the present embodiment, as shown in FIG. 11, the rotor core 5 has a perfect inner circular through hole 25 penetrating in the axial direction and an inner weld through hole from the inner peripheral surface 25 a of the inner weld through hole 25. And a welding protrusion 27 protruding toward the center of the hole 25. The welding protrusion 27 protrudes toward the outer peripheral side from a portion of the inner peripheral surface 25a of the inner welding through hole 25 that is closer to the inner peripheral surface 17 of the rotor core 5. And as shown in FIG. 12, each 1st coupling | bond part 15 is formed by welding the steel plates 11 adjacent to an axial direction in the welding protrusion part 27. As shown in FIG. According to the above structure, compared with the case where the inner peripheral surface 25a of the inner side welding through-hole 25 is welded, the energy required in the case of welding can be restrained low.

DESCRIPTION OF SYMBOLS 1 Motor 2 Stator core 3 Stator coil 4 Stator 5 Rotor core 6 Shaft 6a Outer peripheral surface 7 Rotor 8 Front housing 9 Rear housing 10 Key groove 11 Steel plate 12 Shaft insertion hole 13 Permanent magnet 14 Magnet holding hole 14a Inner peripheral end 15 First coupling part 16 Second connecting portion 17 Inner peripheral surface 18 Outer peripheral surface 19 Key 20 High in-plane rigidity region 21 Low in-plane rigidity region 25 Inner weld through hole 25a Inner peripheral surface 26 Outer weld through hole 26a Inner peripheral surface 27 Weld protrusion
D distance

Claims (4)

A shaft,
A rotor core configured by laminating a plurality of steel plates in the axial direction;
With
The rotor core was attached to the shaft by shrink fitting,
A rotor,
A plurality of magnet holding holes for holding permanent magnets are formed near the outer periphery of the rotor core,
The rotor core is provided with a first coupling portion and a second coupling portion that couple the steel plates adjacent in the axial direction on the inner peripheral side of the plurality of magnet holding holes,
The first coupling portion is formed in the vicinity of the inner peripheral surface of the rotor core,
The second coupling portion is formed on the outer peripheral side of the first coupling portion, and when the distance in the radial direction from the inner peripheral surface of the rotor core to the plurality of magnet holding holes is D, the rotor core It is formed at a position away from the inner peripheral surface by D / 2 or more,
Rotor. The rotor according to claim 1,
The first coupling portion is formed by any one of caulking, welding on the inner peripheral surface of the rotor core, or welding on an inner peripheral surface of an inner welding through hole formed so as to penetrate in the axial direction. Yes,
Rotor. The rotor according to claim 1 or 2,
The second coupling part is formed by either caulking or welding on the inner peripheral surface of the inner welding through hole formed so as to penetrate in the axial direction.
Rotor. The rotor according to any one of claims 1 to 3,
The first coupling portion and the second coupling portion are formed at a plurality of locations in the circumferential direction, and are formed at different positions in the circumferential direction.
Rotor.

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