JP2015204680A - Rotor for rotary electric machine, and rotary electric machine with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor for a rotary electric machine capable of reducing axial and circumferential movements of a magnet detachment prevention member, and the rotary electric machine with the same.SOLUTION: A rotor 4 for the rotary electric machine includes: a rotor core 7 that is formed by laminating cores of thin plates; a shaft 8 inserted into the rotor core; a magnet 9 inserted into a magnet insertion hole provided in the rotor core; and a receiving plate 10 and a pressing plate 11 which are disposed so as to hold the rotor core therebetween in an axial direction. The pressing plate includes a key 111, and the shaft includes a key groove 81 corresponding to the key. The key groove includes: an axial key groove part 811 which is formed in an axial direction of the shaft; a circumferential key groove part 812 which communicates to the axial key groove part and is formed in a circumferential direction; and a key groove return part 813 which communicates to the circumferential key groove part and regulates the key of the pressing plate axially and circumferentially.

Description

  The present invention relates to a rotor of a rotating electrical machine and a rotating electrical machine including the same.

  The rotor of the rotating electrical machine includes a rotor core formed by stacking thin cores, a shaft fitted to the rotor core inner diameter, a magnet accommodated in a magnet insertion hole provided in the rotor core, It comprises a member (magnet detachment prevention member) that sandwiches both axial end surfaces of the rotor core and prevents the detachment of the magnet.

  When the shaft is a solid shaft, it is common to restrict the movement of the rotor core in the axial direction by shrink fitting or press-fitting a magnet separation preventing member into the shaft. On the other hand, in order to restrict the movement of the rotor core in the circumferential direction, a key is provided on the rotor core and fitted into the key groove of the shaft, or the rotor core is shrink-fitted or press-fitted into the shaft. It has been known.

  However, when the magnet detachment preventing member is shrink-fitted onto the shaft, the time for heating the magnet detachment preventing member and the time for cooling after the shrink-fitting are required, so that the working time in the manufacturing process is deteriorated. Further, when the magnet detachment preventing member is shrink-fitted or press-fitted into the shaft, a radial stress is always applied to the fitting surface between the inner diameter of the magnet detachment preventing member and the outer diameter of the shaft.

  On the other hand, for example, in Patent Document 1, a key provided on a laminated rotor core is press-fitted into a shaft key groove, and a key provided on a magnet detachment preventing member is inserted into a key groove provided on a shaft. It is described that the shaft key groove provided in the direction orthogonal to the axial direction is rotated and fixed.

JP 2013-118803 A

  However, in Patent Document 1, although the point that the magnet detachment preventing member is closely attached in the axial direction using an elastic member is described, the idling of the magnet detachment preventing member in the circumferential direction due to the torque generated during the rotation operation is described. There is no mention of how to prevent it.

  Then, an object of this invention is to provide the rotor of a rotary electric machine which can reduce the movement to the axial direction and circumferential direction of a magnet detachment | leave prevention member, and a rotary electric machine provided with the same.

  In order to solve the above problems, for example, the configuration described in the claims is adopted.

  The present application includes a plurality of means for solving the above-described problems. For example, a rotor core formed by stacking thin cores, a shaft inserted into the rotor core, and the rotation A magnet inserted into a magnet insertion hole provided in the child core, and a receiving plate and a holding plate arranged so as to sandwich the rotor core in the axial direction, and a key is provided on the holding plate, In the rotor of the rotating electrical machine in which the shaft is provided with a key groove corresponding to the key, the key groove communicates with an axial key groove formed in the axial direction of the shaft and the axial key groove. And a circumferential key groove portion formed in the circumferential direction, and a key groove return portion communicating with the circumferential key groove portion and restricting the key of the holding plate in the axial direction and the circumferential direction.

  ADVANTAGE OF THE INVENTION According to this invention, the rotor of the rotary electric machine which can reduce the movement to the axial direction and the circumferential direction of a magnet detachment | leave prevention member, and a rotary electric machine provided with the same can be provided.

Sectional drawing which shows the structure of the rotary electric machine which concerns on the Example of this invention. The figure which shows the structure of the rotor in 1st Example of this invention. The figure which shows the structure of the rotor in 2nd Example of this invention.

Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, a vehicular rotating electrical machine is used as an example of the rotating electrical machine.
[First embodiment]
FIG. 1 is a cross-sectional view showing the overall configuration of the rotating electrical machine in the first embodiment.

  The rotating electrical machine 1 includes a center bracket 2, a stator 3, a rotor 4, a stator core 5, a stator coil 6, a rotor core 7, a shaft 8, a magnet 9, a receiving plate 10, a holding plate 11, and a front side bearing 12. , Rear side bearing 13, front cover 14, rear cover 15 and the like.

  The center bracket 2 holds a stator 3 on the inner diameter side, and a rotor 4 is rotatably held on the inner peripheral side of the stator 3 through a gap.

  The stator 3 is configured by winding a stator coil 6 around a stator core 5 formed by stacking thin cores.

  The rotor 4 includes a rotor core 7 formed by stacking thin cores, and a key provided on the rotor core 7 and a key groove provided on the shaft 8 are fitted to each other. The movement in the circumferential direction is fixed. In addition, a plurality of magnets 9 are inserted into the rotor 4 in magnet insertion holes provided in the rotor core 7, and are received on both end surfaces in the axial direction of the rotor core 7 to prevent the magnets from being detached. A plate 10 and a holding plate 11 are arranged.

  A front-side bearing 12 and a rear-side bearing 13 are fitted to the shaft 8 and are rotatably supported. The front-side bearing 12 is housed in the front cover 14 and the rear-side bearing 13 is housed in the rear cover 15. .

  FIG. 2 is a diagram showing the configuration of the rotor in the first embodiment.

  In order to increase the space factor of the laminated rotor core 7 after inserting the rotor core 7 into the shaft 8, and when filling the rotor core 7 with an insulating resin material for fixing the magnet, the laminated rotation In order to prevent leakage from between the child cores 7, a certain load is applied to the axial end surface of the rotor core 7.

  A plurality of magnets 9 are inserted while applying a constant load to the rotor core 7, and the key 111 provided on the holding plate 11 is inserted in alignment with the key groove 81 of the shaft.

  The key groove 81 communicates with the axial key groove portion 811 formed in the axial direction and the axial key groove portion 811, communicates with the circumferential key groove portion 812 formed in the circumferential direction, and the circumferential key groove portion 812, and is suppressed. The key 11 of the plate 11 is configured by a keyway return portion 813 for restricting the key 111 in the axial direction and the circumferential direction. After the key 111 of the holding plate 11 is inserted into the axial keyway portion 811 of the shaft 8, The holding plate 12 is rotated along the key groove return portion 813.

  By releasing the pressurized state of the rotor core 7 and using the spring back of the rotor core 7, the key 111 of the holding plate 11 is held down by the key groove return portion 813 of the shaft 8, and as a result, the holding plate 11. The movement in the axial direction and the circumferential direction can be restricted.

  The axial depth of the keyway return portion 813 of the shaft 8 (the depth toward the axially opposite rotor core side) is preferably shallower than the spring back of the rotor core 7.

Further, the number of the keys 111 of the holding plate 11 and the number of the key grooves 81 of the shaft 8 corresponding to the keys 111 are preferably two, but are not limited thereto.
[Second Embodiment]
FIG. 3 is a diagram showing the configuration of the rotor in the second embodiment.

  What is characteristic in the present embodiment is that there are a plurality of keyway return portions 813, 814, and 815 formed in the shaft 8. In addition, the same code | symbol is attached | subjected to the component similar to 1st Example, and detailed description is abbreviate | omitted.

  The keyway return portions 813, 814, and 815 are selectively used depending on the axial dimensional tolerance of the rotor core 7. When the axial dimension of the rotor core 7 is the smallest within the tolerance, there is a possibility that the force that holds the restraining plate 11 by the spring back of the rotor core 7 becomes weak. Further, when the axial dimension of the rotor core 7 is the maximum within the tolerance, the key 111 of the holding plate 11 may not be able to pass the circumferential key groove portion 812 of the shaft 9.

  Keyway return portions 813, 814, and 815 provided on the shaft 8 change the axial position of the restraining plate 11 in accordance with the axial dimensional tolerance of the rotor core 7. In the example shown in FIG. 3, the positions of the axial ends of the keyway return portions 813, 814, and 815 (the portion that restricts the movement of the holding plate 11 toward the axially opposite rotor core side) are the axial keyway portions 811. The axial end of the key groove return portion 813 closest to the circumferential direction is the farthest axially far from the rotor core, and the axial end of the key groove return portion 815 farthest from the axial key groove 811 in the circumferential direction is , It is formed so as to be closest to the rotor core in the axial direction. However, this positional relationship is not limited to this. For example, the axial ends of the keyway return portion 814 and the keyway return portion 815 may be formed so as to be farthest from the rotor core in the axial direction. Good.

  In the case of the example shown in FIG. 3, the key groove return portion 815 is used when the axial dimension tolerance of the rotor core 7 is the smallest, and the key groove return portion 814 is used when the dimension is the median value. In the case of a value, the keyway returning portion 813 is used.

  The axial depth of the keyway return portions 813, 814, and 815 of the shaft 8 is preferably shallower than the spring back of the rotor core 7.

  Moreover, although the present Example demonstrated in the example in which the keyway return part was provided in 3 steps | paragraphs in the circumferential direction, 2 steps | paragraphs or 4 steps | paragraphs or more may be provided.

  Further, the number of the keys 111 of the holding plate 11 and the number of the key grooves 81 of the shaft 8 corresponding to the keys 111 are preferably two, but are not limited thereto.

  By comprising as mentioned above, the rotor of the rotary electric machine which can reduce the movement to the axial direction and the circumferential direction of a magnet detachment prevention member, and a rotary electric machine provided with the same can be provided.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Rotary electric machine 2 ... Center bracket 3 ... Stator 4 ... Rotor 5 ... Stator coil 6 ... Stator core 7 ... Rotor core 8 ... Shaft 9 ... Magnet 10 ... Base plate 11 ... Holding plate 111 ... Key 12 ... Front side bearing 13 ... Rear side bearing 14 ... Front cover 15 ... Rear cover

Claims (5)

A rotor core formed by laminating thin cores;
A shaft inserted into the rotor core;
A magnet inserted into a magnet insertion hole provided in the rotor core;
Having a backing plate and a holding plate arranged so as to sandwich the rotor core in the axial direction;
The holding plate is provided with a key,
In the rotor of the rotating electrical machine in which the shaft is provided with a keyway corresponding to the key,
The key groove communicates with the axial key groove portion formed in the axial direction of the shaft, the axial key groove portion, the circumferential key groove portion formed in the circumferential direction, and the circumferential key groove portion, A rotor of a rotating electrical machine having a keyway returning portion that regulates a key of the holding plate in an axial direction and a circumferential direction. The rotor of the rotating electrical machine according to claim 1,
A rotor of a rotating electrical machine in which the keyway return portion is provided in a plurality of stages in the circumferential direction. In the rotor of the rotary electric machine according to claim 1 or 2,
A rotor of a rotating electrical machine in which an axial depth of the keyway return portion is shallower than an axial springback of the laminated rotor core. In the rotor of the rotary electric machine according to any one of claims 1 to 3,
A rotor of a rotating electrical machine having a plurality of keys of the holding plate and the key grooves corresponding to the keys.   The rotary electric machine provided with the rotor of the rotary electric machine in any one of Claims 1 thru | or 4.