JP2023161169A - Rotary electric machine, and rotor therefor - Google Patents

Abstract

To provide a rotary electric machine and a rotor therefor capable of suppressing reduction in assembly workability.SOLUTION: A rotor shaft 8 is provided with a pair of grooves 8a. Further, first end plates 14 each comprise a plurality of first protrusions 14b. Further, first front ends 14c each are inserted into the groove 8a. Then, the first protrusions 14b each are elastically deformed in a direction where the first front ends 14c each approach an end face 11c. Thus, a first plate primary part 14a is pushed in a direction of coming into contact with the end face 11c by each restoring force of the plurality of first protrusions 14b.SELECTED DRAWING: Figure 7

Description

The present disclosure relates to a rotating electric machine and its rotor.

In a conventional electric motor rotor, the end plate is fixed to the rotor shaft by caulking the rotor shaft (for example, see Patent Document 1).

JP2004-222348A

In the conventional electric motor rotor as described above, the rotor shaft must be caulked, which reduces assembly workability.

The present disclosure has been made to solve the above-mentioned problems, and aims to provide a rotating electric machine and its rotor that can suppress deterioration in assembly workability.

A rotor for a rotating electric machine according to the present disclosure includes a rotor core provided with a magnet insertion hole and a shaft insertion hole, a permanent magnet inserted in the magnet insertion hole, a rotor shaft inserted in the shaft insertion hole, and a rotor core provided with a magnet insertion hole and a shaft insertion hole. The end plate body is placed on the end face of the rotor core in the axial direction of the shaft and prevents the permanent magnet from coming out of the magnet insertion hole. is provided, and the end plate body has a first end plate, and the first end plate has an annular first plate main part and an inner side of the first plate main part from the first plate main part, respectively. The first protrusion has a plurality of first protrusions protruding from the end surface, and the first tip of each first protrusion is inserted into the groove, and the first tip of each first protrusion is inserted into the groove. The first plate main portion is elastically deformed in a direction approaching the end surface, and the first plate main portion is pushed in a direction toward contact with the end surface by the restoring force of each of the plurality of first protrusions.

According to the rotating electric machine and its rotor of the present disclosure, it is possible to suppress a decrease in assembly workability.

1 is a sectional view of a rotating electrical machine according to a first embodiment. FIG. 2 is a perspective view showing the rotor of FIG. 1; FIG. 3 is a cross-sectional view of the rotor of FIG. 2; 3 is a perspective view showing the rotor core and a plurality of permanent magnets of FIG. 2. FIG. FIG. 4 is a perspective view showing the first end plate of FIG. 3; FIG. 4 is a perspective view showing the second end plate of FIG. 3; FIG. 4 is a cross-sectional view showing an enlarged main part of FIG. 3;

Hereinafter, embodiments will be described with reference to the drawings.
Embodiment 1.
FIG. 1 is a sectional view of a rotating electric machine according to a first embodiment. In the figure, the rotating electric machine includes a housing 1, a first bearing 2, a second bearing 3, a stator 4, and a rotor 5.

The first bearing 2 and the second bearing 3 are held in the housing 1. The first bearing 2 and the second bearing 3 are opposed to each other.

The stator 4 has an annular stator core 6 and a plurality of stator coils 7. Stator core 6 is fixed within housing 1 . The plurality of stator coils 7 are each wound around the stator core 6.

The rotor 5 has a rotor shaft 8 and a rotor body 9. The rotor shaft 8 is rotatably held in the housing 1 via the first bearing 2 and the second bearing 3. FIG. 1 shows a cross section of the rotating electrical machine along the axis C of the rotor shaft 8. As shown in FIG.

The rotor body 9 is fixed to the rotor shaft 8 within the housing 1 and rotates together with the rotor shaft 8. The outer circumferential surface of the rotor body 9 faces the inner circumferential surface of the stator core 6 with a gap interposed therebetween.

FIG. 2 is a perspective view showing the rotor 5 of FIG. 1, with a part of the rotor main body 9 cut away. FIG. 3 is a cross-sectional view of the rotor 5 in FIG. 2, showing a cross section along the axis C of the rotor shaft 8.

The rotor body 9 has an annular rotor core 11, a plurality of permanent magnets 12, and a pair of end plate bodies 13.

The rotor core 11 is configured by laminating a plurality of annular magnetic steel plates in the axial direction of the rotor shaft 8. The axial direction of the rotor shaft 8 is parallel to the axis C. The plurality of magnetic steel plates are integrated at the plurality of caulked portions 11d.

FIG. 4 is a perspective view showing the rotor core 11 and a plurality of permanent magnets 12 in FIG. 2. A shaft insertion hole 11a is provided at the center of the rotor core 11. The rotor shaft 8 is inserted into the shaft insertion hole 11a. Further, the rotor shaft 8 passes through the rotor core 11.

A plurality of magnet insertion holes 11b are provided in the rotor core 11 at equal intervals in the circumferential direction of the rotor shaft 8. The plurality of magnet insertion holes 11b are located on the same circumference centered on the axis C. Further, each magnet insertion hole 11b is continuously provided throughout the rotor core 11 along the axial direction of the rotor shaft 8.

Each permanent magnet 12 is inserted into a corresponding magnet insertion hole 11b. The dimensions of each permanent magnet 12 in the axial direction of the rotor shaft 8 are the same as the dimensions of the rotor core 11 in the axial direction of the rotor shaft 8. Each permanent magnet 12 may be configured by arranging a plurality of divided magnets in the axial direction of the rotor shaft 8 .

Returning to FIG. 3, each end plate body 13 is in contact with the end surface 11c of the rotor core 11 in the axial direction of the rotor shaft 8. Thereby, each end plate body 13 covers the plurality of magnet insertion holes 11b, and prevents the plurality of permanent magnets 12 from coming off from the plurality of magnet insertion holes 11b.

Each end plate body 13 has an annular first end plate 14 and an annular second end plate 15. The second end plate 15 is in contact with the corresponding end surface 11c. The first end plate 14 is in contact with the second end plate 15. That is, the second end plate 15 is interposed between the end surface 11c and the first end plate 14.

A pair of grooves 8a are provided on the outer peripheral surface of the rotor shaft 8 at intervals in the axial direction of the rotor shaft 8. Each groove 8a is provided along the circumferential direction of the rotor shaft 8. Moreover, each groove 8a is provided continuously over the entire circumference of the rotor shaft 8. The circumferential direction of the rotor shaft 8 is a direction along the circumference around the axis C.

The rotor core 11 is arranged between the pair of grooves 8a in the axial direction of the rotor shaft 8.

FIG. 5 is a perspective view showing the first end plate 14 of FIG. 3. The first end plate 14 has an annular first plate main portion 14a and a plurality of first protrusions 14b.

The plurality of first protrusions 14b each protrude from the first plate main portion 14a toward the inside of the first plate main portion 14a. That is, each first protrusion 14b protrudes toward the rotor shaft 8. Furthermore, each first protrusion 14b is elastically deformable.

The dimensions of each first protrusion 14b in the circumferential direction of the rotor shaft 8 continuously decrease as the distance from the first plate main portion 14a increases.

FIG. 6 is a perspective view showing the second end plate 15 of FIG. 3. The second end plate 15 has an annular second plate main portion 15a and a plurality of second protrusions 15b.

The plurality of second protrusions 15b each protrude from the second plate main portion 15a toward the inside of the second plate main portion 15a. That is, each second protrusion 15b protrudes toward the rotor shaft 8. Furthermore, each second protrusion 15b is elastically deformable.

The dimensions of each of the second projections 15b in the circumferential direction of the rotor shaft 8 continuously become smaller as the distance from the second plate main portion 15a increases.

In the first embodiment, as shown in FIG. 2, a plurality of first protrusions 14b and a plurality of second protrusions 15b are arranged alternately in the circumferential direction of the rotor shaft 8.

FIG. 7 is an enlarged cross-sectional view of the main part of FIG. 3. A first tip 14c, which is a tip of each first protrusion 14b, is inserted into the groove 8a. Each first projection 14b is elastically deformed in a direction in which the first tip 14c approaches the end surface 11c. Each first tip 14c is in contact with a side surface of the groove 8a.

The first plate main portion 14a is pushed in the direction of contact with the end surface 11c by the restoring force of each of the plurality of first protrusions 14b. Thereby, the first plate main portion 14a presses the second plate main portion 15a against the end surface 11c.

A second tip 15c, which is a tip of each second protrusion 15b, is inserted into the groove 8a. Moreover, each second tip 15c is in contact with the bottom surface of the groove 8a.

Each second protrusion 15b is elastically deformed when the second end plate 15 is attached to the rotor shaft 8. Further, each second protrusion 15b restores its original state when the second tip 15c is inserted into the groove 8a. Therefore, after the rotor 5 is assembled, each second protrusion 15b is in contact with the end surface 11c together with the second plate main portion 15a.

In such a rotating electric machine and its rotor 5, the rotor shaft 8 is provided with a pair of grooves 8a. Further, each first end plate 14 has a plurality of first protrusions 14b. Further, each first tip 14c is inserted into the groove 8a. Each first protrusion 14b is elastically deformed in a direction in which the first tip 14c approaches the end surface 11c. As a result, the first plate main portion 14a is pushed in the direction of contact with the end surface 11c by the restoring force of each of the plurality of first protrusions 14b.

For this reason, each first end plate 14 is easily attached to the rotor shaft 8 by passing the rotor shaft 8 through each first end plate 14 and elastically deforming each first projection 14b and inserting it into the groove 8a. This makes it possible to suppress deterioration in assembly workability.

Further, by attaching each first end plate 14 to the rotor shaft 8, the rotor core 11 can be easily positioned.

Further, by elastically deforming the plurality of first protrusions 14b, stacking tolerances of the rotor core 11 can be absorbed. Further, it is possible to more reliably prevent the plurality of permanent magnets 12 from coming off from the plurality of magnet insertion holes 11b.

Further, by simply providing the pair of grooves 8a in the rotor shaft 8, the end plate bodies 13 can be easily arranged on both sides of the rotor core 11.

Further, a second end plate 15 is interposed between the end surface 11c and the first end plate 14. Therefore, the thickness dimension of the first end plate 14 and the thickness dimension of the second end plate 15 can be reduced, making it easier to attach the end plate body 13 to the rotor shaft 8. can.

Moreover, the plurality of second protrusions 15b are each in contact with the end surface 11c. Therefore, the rotor core 11 can be positioned more stably with respect to the rotor shaft 8.

Note that in a structure in which the rotor core 11 is sandwiched between a pair of end plate bodies 13, the plurality of caulking portions 11d may be omitted.

Further, two or more first end plates 14 may be used in one end plate body 13.

Further, two or more second end plates 15 may be used in one end plate body 13.

Moreover, each second protrusion 15b may be deformed in a direction in which the second tip 15c is separated from the end surface 11c in a state where the second plate main portion 15a is in contact with the end surface 11c.

Further, the second end plate 15 may be omitted. That is, the end plate body 13 may be composed of only the first end plate 14.

Furthermore, the grooves 8a may be provided intermittently along the circumferential direction of the rotor shaft 8.

Further, the end plate body 13 of the first embodiment may be applied only to one end of the rotor core 11 in the axial direction of the rotor shaft 8.

5 rotor, 8 rotor shaft, 8a groove, 11 rotor core, 11a shaft insertion hole, 11b magnet insertion hole, 11c end face, 12 permanent magnet, 13 end plate body, 14 first end plate, 14a first plate main part, 14b First protrusion, 14c first tip, 15 second end plate, 15a second plate main part, 15b second protrusion, 15c second tip.

Claims (4)

a rotor core provided with a magnet insertion hole and a shaft insertion hole;
a permanent magnet inserted into the magnet insertion hole;
A rotor shaft inserted into the shaft insertion hole; and an end plate body that is applied to an end surface of the rotor core in the axial direction of the rotor shaft and prevents the permanent magnet from coming out of the magnet insertion hole. ,
A groove is provided on the outer peripheral surface of the rotor shaft along the circumferential direction of the rotor shaft,
The end plate body has a first end plate,
The first end plate is
an annular first plate main part;
a plurality of first protrusions each protruding from the first plate main part to the inside of the first plate main part,
A first tip, which is a tip of each of the first protrusions, is inserted into the groove,
Each of the first projections is elastically deformed in a direction in which the first tip approaches the end surface,
The first plate main portion is a rotor of a rotating electric machine, in which the first plate main portion is pushed in a direction in contact with the end surface by the restoring force of each of the plurality of first protrusions. The end plate body further includes a second end plate interposed between the end surface and the first end plate,
The second end plate is
an annular second plate main part;
a plurality of second protrusions each protruding from the second plate main part to the inside of the second plate main part,
The rotor for a rotating electrical machine according to claim 1, wherein a second tip, which is a tip of each of the second protrusions, is inserted into the groove. The rotor for a rotating electric machine according to claim 2, wherein each of the second projections is in contact with the end surface. A rotating electrical machine comprising the rotor according to any one of claims 1 to 3.