JP2021125955A - Rotor for rotary electric machine - Google Patents

Abstract

To provide a rotor for a rotary electric machine which prevents the deformation of an electromagnetic steel sheet, arranged at the outermost end of a rotor core in an axial direction, while preventing the damage of a sleeve member.SOLUTION: A rotor 10 for a rotary electric machine includes a sleeve member 40 fixed to the outer peripheral surface 20a of a rotor core 20. The sleeve member 40 is arranged in such a manner that an end part 401 in the axial direction is positioned inside than an end face 201 of the rotor core 20 in the axial direction. A permanent magnet 50 inserted in a magnet insertion hole 22 of the rotor core 20 is arranged in such a manner that an end face 501 in the axial direction is positioned substantially coincident with the end face 201 of the rotor core 20 in the axial direction. A chamfering part 55 is formed on an outer diameter side end part 501a of the end face 501 of the permanent magnet 50 in the axial direction. A length L1 of the chamfering part 55 in the axial direction is longer than a thickness t of the electromagnetic steel sheet 200a in the axial direction, which is arranged at the outermost end of the rotor core 20 in the axial direction.SELECTED DRAWING: Figure 3

Description

The present invention relates to a rotor of a rotary electric machine mounted on an electric vehicle or the like.

In recent years, electric vehicles such as hybrid vehicles, battery-powered vehicles, and fuel cell vehicles have become widespread, and these electric vehicles are equipped with rotary electric machines such as electric motors and generators. As one of the rotary electric machines mounted on an electric vehicle, an IPM (Interior Permanent Magnet) type rotary electric machine in which a plurality of permanent magnets are arranged inside a rotor core at predetermined intervals in the circumferential direction is known.

With the widespread use of electric vehicles, rotary electric machines mounted on electric vehicles are further required to have improved output performance. In the case of an IPM type rotary electric machine, in order to improve the output performance, a plurality of permanent magnets arranged inside the rotor core are arranged as far as possible outside the rotor core in the radial direction, and the magnet insertion hole and the outer peripheral surface of the rotor core are arranged. It is effective to make the connecting ribs formed between the two thin. However, when the connecting ribs become thin, stress is concentrated on the connecting ribs when the rotor core receives a radial outward centrifugal load from the permanent magnets due to the centrifugal force of the permanent magnets during rotation of the rotor, and the rotor cores, especially the rotor cores, in particular. Since the connecting ribs are easily deformed radially outward, there is a limit to arranging the permanent magnets radially outward and making the connecting ribs thinner.

Therefore, for example, Patent Document 1 includes a rotor core in which a magnet insertion hole is formed, a permanent magnet inserted in the magnet insertion hole, and a substantially ring-shaped sleeve member surrounding the outer peripheral surface of the rotor core. Rotors are disclosed. In the rotor of the rotary electric machine described in Patent Document 1, since the outer peripheral surface of the rotor core is surrounded by a sleeve member, the rotor core is centrifugally outward from the permanent magnet by the centrifugal force of the permanent magnet when the rotor is rotated. Even when a load is applied, it is possible to prevent the rotor core, particularly the connecting ribs, from being deformed radially outward. As a result, in the rotor of the rotary electric machine described in Patent Document 1, a plurality of permanent magnets arranged inside the rotor core are arranged on the outer side in the radial direction of the rotor core as much as possible, and the connecting ribs are thinned to deform the rotor core. Can be prevented.

Japanese Unexamined Patent Publication No. 2016-100955

However, in the rotor of the rotary electric machine of Patent Document 1, if the axial end portion of the sleeve member protrudes outward in the axial direction from the axial end face of the rotor core due to a manufacturing error or the like, the sleeve member When a centrifugal load is applied from the rotor core in the radial outward direction due to the rotation of the rotor, the shear stress is concentrated on the portion of the rotor core that abuts on the axial end face. Therefore, there is a problem that the axial end portion of the sleeve member is easily damaged starting from the portion that comes into contact with the axial end surface of the rotor core. On the other hand, if the axial end of the sleeve member is located inward in the axial direction with respect to the axial end face of the rotor core, the sleeve member is placed at the outermost axial end of the rotor core. This means that only a part of the outer peripheral surface of the steel sheet is surrounded. Therefore, the electrical steel sheet arranged at the outermost end in the axial direction of the rotor core tends to be deformed to the outside in the radial direction when a centrifugal load in the radial outward direction is applied from the permanent magnet by the rotation of the rotor. There is a problem.

The present invention provides a rotor of a rotary electric machine that prevents deformation of an electromagnetic steel plate arranged at the outermost end in the axial direction of a rotor core while preventing the sleeve member from being damaged.

The present invention
A rotor core formed by laminating a plurality of substantially ring-shaped electrical steel sheets in the axial direction,
A plurality of magnetic pole portions formed on the rotor core at predetermined intervals in the circumferential direction,
A substantially ring-shaped sleeve member that surrounds the outer peripheral surface of the rotor core is provided.
Each magnetic pole portion is a rotor of a rotary electric machine having at least one magnet insertion hole penetrating the rotor core in the axial direction and a permanent magnet inserted into the magnet insertion hole.
The rotor core has an outer diameter side yoke portion formed on the outer side in the radial direction of the magnet insertion hole, an inner diameter side yoke portion formed on the inner side in the radial direction of the magnet insertion hole, and the outer diameter side yoke portion. It has a connecting rib that connects the inner diameter side yoke portion and the inner diameter side yoke portion on the outer peripheral surface of the rotor core.
The sleeve member is arranged so that the axial end portion is inside the axial end surface of the rotor core in the axial direction.
The permanent magnet is arranged so that the end face in the axial direction substantially coincides with the end face in the axial direction of the rotor core in the axial direction.
A chamfered portion is formed at the outer diameter side end portion of the end face in the axial direction of the permanent magnet.
The axial length of the chamfered portion is longer than the axial thickness of the electromagnetic steel sheet arranged at the outermost axial end of the rotor core.

According to the present invention, the sleeve member is arranged so that the axial end portion is inside the axial end surface of the rotor core in the axial direction. Therefore, when the rotor rotates, the sleeve member is displaced from the rotor core. It is possible to prevent the sleeve member from being damaged when a centrifugal load is applied in the radial outward direction.
Further, the axial length of the chamfer formed at the outer diameter side end of the axial end face of the permanent magnet is larger than the axial thickness of the electromagnetic steel plate arranged at the outermost axial end of the rotor core. Even if centrifugal force acts on the permanent magnet due to the rotation of the rotor, the outer diameter side end of the axial end face of the permanent magnet hits the electromagnetic steel plate arranged at the outermost end in the axial direction of the rotor core. Do not touch. As a result, even if a centrifugal force acts on the permanent magnet due to the rotation of the rotor, it is possible to prevent the electromagnetic steel plate arranged at the outermost end in the axial direction of the rotor core from being deformed.
Therefore, according to the present invention, it is possible to prevent the sleeve member from being damaged and to prevent the electromagnetic steel plate arranged at the outermost end in the axial direction of the rotor core from being deformed.

It is a front view which saw the rotor of the rotary electric machine of 1st Embodiment of this invention from the axial direction. It is an enlarged view around the magnetic pole part of the rotor of the rotary electric machine of FIG. FIG. 2 is a cross-sectional view taken along the line AA of FIG. This is a modified example of the chamfered portion of the rotor of the rotary electric machine according to the embodiment of the present invention. It is an enlarged view around the magnetic pole part of the rotor of the rotary electric machine of the 2nd Embodiment of this invention.

Hereinafter, embodiments of the rotor of the rotary electric machine of the present invention will be described with reference to the accompanying drawings.

[First Embodiment]
First, the rotor 10 of the rotary electric machine according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 4.

(Rotor)
As shown in FIG. 1, the rotor 10 of the rotary electric machine according to the first embodiment of the present invention has a substantially annular shape centered on the annular center CL. The rotor 10 of the rotary electric machine is attached to the outer peripheral portion of the rotor shaft (not shown), and is formed on the rotor core 20 having a substantially annular shape centered on the ring center CL and at predetermined intervals in the circumferential direction. A plurality of magnetic pole portions 30 (12 in this embodiment) and a sleeve member 40 having a substantially cylindrical shape surrounding the outer peripheral surface 20a of the rotor core 20 and centered on the ring center CL are provided. The rotor 10 is arranged on the inner peripheral side of the stator (not shown).

In the present specification and the like, the axial direction, the radial direction, and the circumferential direction refer to the directions based on the ring center CL of the rotor 10 without notice. Further, the inner side in the axial direction means the central side in the axial direction of the rotor 10, and the outer side in the axial direction means the side away from the center in the axial direction of the rotor 10.

The rotor core 20 is formed by laminating a plurality of electromagnetic steel sheets 200 having a substantially annular shape having the same shape in the axial direction (see FIG. 3). The rotor core 20 has a rotor shaft hole 21 at the same center as the ring center CL.

Each magnetic pole portion 30 formed in the rotor core 20 has a magnet insertion hole 22 that penetrates the rotor core 20 in the axial direction, and a permanent magnet 50 that is inserted into the magnet insertion hole 22.

As shown in FIG. 2, the central axis of each magnetic pole portion 30 connecting the ring center CL and the center of each magnetic pole portion 30 is separated by an electrical angle of 90 ° with respect to the d-axis (d-axis in the figure) and the d-axis. When the axis is the q-axis (q-axis in the figure), in the present embodiment, the magnet insertion hole 22 extends in a direction substantially orthogonal to the d-axis when viewed from the axial direction, and is substantially symmetrical with respect to the d-axis. Shape. The magnet insertion hole 22 has an outer diameter side wall surface 221 extending in a direction substantially orthogonal to the d axis and a direction inside the outer diameter side wall surface 221 in the radial direction, facing the outer diameter side wall surface 221 and substantially orthogonal to the d axis. It has an inner diameter side wall surface 222 extending to.

The permanent magnet 50 inserted into the magnet insertion hole 22 has a substantially rectangular shape when viewed from the axial direction. The permanent magnet 50 faces the outer diameter side wall surface 221 of the magnet insertion hole 22 and extends in a direction substantially orthogonal to the d axis, and faces the inner diameter side wall surface 222 of the magnet insertion hole 22 and faces the d axis. From the end of the inner diameter side end surface 52 extending in a direction substantially orthogonal to the outer diameter side end surface 51 and one end side of the outer diameter side end surface 51 in the circumferential direction (left side in FIG. 2) to one end side of the inner diameter side end surface 52 in the circumferential direction (left side in FIG. 2) From the end face 53 on the one end side in the circumferential direction extending substantially parallel to the d-axis to the end of the outer diameter side and the other end side (right side in FIG. It has an end surface 54 on the other end side in the circumferential direction extending substantially parallel to the d-axis toward the other end side (right side in FIG. 2). The magnet insertion hole 22 is formed with a gap portion 223 on the outer side in the circumferential direction of the end face 53 on one end side in the circumferential direction and on the outer side in the circumferential direction of the end face 54 on the other end side in the circumferential direction.

The magnet insertion hole 22 is filled with resin 60. The permanent magnet 50 inserted into the magnet insertion hole 22 is fixed in the magnet insertion hole 22 of the rotor core 20 by the resin 60.

The rotor core 20 has an outer diameter side yoke portion 23 formed on the outer side in the radial direction of the magnet insertion hole 22, an inner diameter side yoke portion 24 formed on the inner side in the radial direction of the magnet insertion hole 22, and an outer diameter side yoke portion. It has a connecting rib 25 for connecting the 23 and the inner diameter side yoke portion 24 on the outer peripheral surface 20a of the rotor core 20. The connecting rib 25 is formed between the gap portion 223 of the magnet insertion hole 22 and the outer peripheral surface 20a of the rotor core 20.

The sleeve member 40 is formed of, for example, a fiber reinforced resin in which carbon fibers are wound in the circumferential direction. The substantially cylindrical sleeve member 40 is fixed to the outer peripheral surface 20a of the rotor core 20, and the rotor core 20 is tightened inward in the radial direction.

When the rotor 10 rotates, centrifugal force is generated in the permanent magnet 50. The permanent magnet 50 is displaced outward in the radial direction by centrifugal force and abuts on the outer diameter side wall surface 221 of the magnet insertion hole 22, and the rotor core 20 receives a centrifugal load in the radial outward direction from the permanent magnet 50. .. When the rotor core 20 receives a centrifugal load in the radial outward direction from the permanent magnet 50, the rotor core 20 may be deformed radially outward. However, since the sleeve member 40 is fixed to the outer peripheral surface 20a of the rotor core 20, the rotor core 20 receives a radial outward centrifugal load from the permanent magnet 50 due to the centrifugal force of the permanent magnet 50 when the rotor 10 rotates. In this case, the sleeve member 40 can prevent the rotor core 20 from being deformed outward in the radial direction.

At this time, since the connecting rib 25 is formed between the gap portion 223 of the magnet insertion hole 22 and the outer peripheral surface 20a of the rotor core 20, the wall thickness in the radial direction is small. Therefore, when the rotor core 20 receives a radial outward centrifugal load from the permanent magnet 50 during rotation of the rotor 10, stress is likely to be concentrated on the connecting rib 25, and the smaller the radial wall thickness of the connecting rib 25, the smaller the radial wall thickness. It is easy to deform outward in the radial direction. However, since the sleeve member 40 is fixed to the outer peripheral surface 20a of the rotor core 20, even if the radial wall thickness of the connecting rib 25 is reduced, the rotor core 20 applies a centrifugal load in the radial outward direction from the permanent magnet 50. When received, the sleeve member 40 can prevent the connecting rib 25 from being deformed radially outward.

Therefore, since the wall thickness of the connecting rib 25 in the radial direction can be made smaller, the leakage flux of the permanent magnet 50 short-circuited through the connecting rib 25 can be reduced, and the output of the rotary electric machine can be increased.

As shown in FIG. 3, the sleeve member 40 is arranged so that the end portion 401 in the axial direction is inside the end surface 201 in the axial direction of the rotor core 20 in the axial direction.

When the rotor 10 rotates, centrifugal force is generated in the rotor core 20 together with the permanent magnet 50. Therefore, the sleeve member 40 receives a radial outward centrifugal load from the rotor core 20. When the axial end 401 of the sleeve member 40 protrudes outward in the axial direction from the axial end face 201 of the rotor core 20, the sleeve member 40 applies a radial outward centrifugal load from the rotor core 20. When this is received, shear stress is concentrated on the portion of the rotor core 20 that abuts on the axial end surface 201, and the axial end 401 of the sleeve member 40 is damaged starting from the portion that abuts on the axial end surface 201 of the rotor core 20. Or it is easy to break.

Since the axial end 401 of the sleeve member 40 is arranged so as to be inside the axial end surface 201 of the rotor core 20 in the axial direction, the axial end 401 of the sleeve member 40 is damaged. Alternatively, it can be prevented from breaking.

The permanent magnet 50 is arranged so that the end face 501 in the axial direction substantially coincides with the end face 201 in the axial direction of the rotor core 20 in the axial direction. As a result, the amount of magnets in the rotor 10 can be increased, and the output of the rotary electric machine can be increased.

A chamfered portion 55 is formed on the outer diameter side end portion 501a of the axial end surface 501 of the permanent magnet 50. In the present embodiment, the outer diameter side end portion 501a of the axial end surface 501 of the permanent magnet 50 is a portion connected to the outer diameter side end surface 51 of the permanent magnet 50 when viewed from the axial direction.

The chamfered portion 55 is a tapered surface that extends in the axial direction from the end surface 501 in the axial direction of the permanent magnet 50 and is inclined outward in the radial direction toward the inside in the axial direction. The axial length L1 of the chamfered portion 55 is longer than the axial thickness t of the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20.

As a result, even if a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10 and the permanent magnet 50 is displaced outward in the radial direction, the outer diameter side end portion 501a of the axial end surface 501 of the permanent magnet 50 remains. It does not come into contact with the electromagnetic steel plate 200a arranged at the outermost end in the axial direction of the rotor core 20.

Since the sleeve member 40 is arranged so that the axial end 401 is inside the axial end surface 201 of the rotor core 20 in the axial direction, the sleeve member 40 is the most axially maximum of the rotor core 20. It surrounds only a part of the outer peripheral surface of the electromagnetic steel sheet 200a arranged at the outer end. Therefore, in the electromagnetic steel plate 200a arranged at the outermost end in the axial direction of the rotor core 20, the permanent magnet 50 is displaced outward in the radial direction by the centrifugal force due to the rotation of the rotor 10, and the outer diameter of the magnet insertion hole 22 is formed. When it comes into contact with the side wall surface 221, it is likely to be deformed to the outside in the radial direction due to the centrifugal load in the radial direction received from the permanent magnet 50. In particular, the connecting rib 25 formed on the electromagnetic steel sheet 200a is easily deformed outward in the radial direction.

However, since the outer diameter side end portion 501a of the axial end surface 501 of the permanent magnet 50 does not abut on the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, the permanent magnet 50 is rotated by the rotation of the rotor 10. The electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20 is not subjected to the centrifugal load in the radial outward direction from the permanent magnet 50 even if the centrifugal force acts on the magnet. As a result, although the sleeve member 40 surrounds only a part of the outer peripheral surface of the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, centrifugal force is applied to the permanent magnet 50 by the rotation of the rotor 10. Is effective, it is possible to prevent the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, particularly the connecting rib 25 formed on the electrical steel sheet 200a, from being deformed outward in the radial direction.

The radial length L2 of the chamfered portion 55 is equal to or less than the axial length L1. As a result, while suppressing a decrease in the amount of magnets of the permanent magnet 50 due to the formation of the chamfered portion 55, the connection formed on the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, particularly the electromagnetic steel sheet 200a. It is possible to prevent the rib 25 from being deformed outward in the radial direction.

The axial end 601 of the resin 60 filled in the magnet insertion hole 22 is located inside the axial end 401 of the sleeve member 40 in the axial direction. As a result, when a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10, the centrifugal load received from the permanent magnet 50 is axially transmitted to the sleeve member 40 by the outer peripheral surface 20a of the rotor core 20 via the resin 60. It is possible to prevent transmission to the unenclosed area S.

Further, the axial end 601 of the resin 60 filled in the magnet insertion hole 22 is from the axial inner end surface 200a1 of the electromagnetic steel plate 200a arranged at the outermost axial end of the rotor core 20 in the axial direction. Is also located inside. As a result, when a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10, the centrifugal load received from the permanent magnet 50 is placed at the outermost axial end of the rotor core 20 via the resin 60. It is possible to prevent transmission to 200a.

In the axial direction, of the outer diameter side wall surface 221 of the magnet insertion hole 22 of the rotor core 20, the non-contact portion 221a facing the chamfered portion 55 of the permanent magnet 50 in the radial direction becomes a permanent magnet 50 by the rotation of the rotor 10. Even if the permanent magnet 50 is displaced outward in the radial direction due to the action of centrifugal force, the permanent magnet 50 does not come into contact with the permanent magnet 50. In the present embodiment, the axial end 601 of the resin 60 filled in the magnet insertion hole 22 coincides with the axial inner end 551 of the chamfer 55 in the axial direction. As a result, when a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10, the centrifugal load received from the permanent magnet 50 is axially transmitted to the outer diameter side of the magnet insertion hole 22 of the rotor core 20 via the resin 60. It is possible to prevent transmission to the non-contact portion 221a of the wall surface 221 that is radially opposed to the chamfered portion 55 of the permanent magnet 50.

As shown in FIG. 4, the chamfered portion 55 may be a so-called R surface in which the end surface 501 in the axial direction of the permanent magnet 50 is rounded with a predetermined curvature. At this time, the axial length L1 and the radial length L2 of the chamfered portion 55 are equal to each other, and the radius of curvature R of the chamfered portion 55 is obtained. Thereby, the chamfered portion 55 can be easily formed.

[Second Embodiment]
Subsequently, the rotor 10A of the rotary electric machine according to the second embodiment of the present invention will be described with reference to FIG. In the following description, the same components as the rotor 10 of the rotary electric machine of the first embodiment are designated by the same reference numerals, and the description thereof will be omitted or simplified. Hereinafter, the differences between the rotor 10 of the rotary electric machine of the first embodiment and the rotor 10A of the rotary electric machine of the second embodiment will be described in detail.

As shown in FIG. 5, each magnetic pole portion 30 formed in the rotor core 20 of the rotor 10A has a first magnet insertion hole 22A and a second magnet insertion hole 22B penetrating the rotor core 20 in the axial direction when viewed from the axial direction. , A first magnet insertion hole 22A, a first permanent magnet 50A, and a second permanent magnet 50B inserted into the second magnet insertion hole 22B.

The first magnet insertion hole 22A is formed on one side (left side in FIG. 5) in the circumferential direction with respect to the d-axis, and the second magnet insertion hole 22B is formed on the other side (in FIG. 5) in the circumferential direction with respect to the d-axis. It is formed on the right side). The first magnet insertion hole 22A and the second magnet insertion hole 22B have a shape symmetrical with respect to the d-axis, and spread outward in the radial direction so that the distance between them in the circumferential direction becomes longer. It is provided in an approximately C shape.

The first magnet insertion hole 22A is substantially straight so that the distance from the d-axis becomes longer toward the outside in the radial direction on one side (left side in FIG. 5) in the circumferential direction with respect to the d-axis when viewed from the axial direction. It has an outer diameter side wall surface 221A extending in a shape, and an inner diameter side wall surface 222A extending radially inside the outer diameter side wall surface 221A, facing the outer diameter side wall surface 221A and substantially parallel to the outer diameter side wall surface 221A.

The second magnet insertion hole 22B is substantially straight so that the distance from the d-axis becomes longer toward the outside in the radial direction on the other side (right side in FIG. 5) in the circumferential direction with respect to the d-axis when viewed from the axial direction. It has an outer diameter side wall surface 221B extending in a shape, and an inner diameter side wall surface 222B extending radially inside the outer diameter side wall surface 221B, facing the outer diameter side wall surface 221B and substantially parallel to the outer diameter side wall surface 221B.

The first permanent magnet 50A inserted into the first magnet insertion hole 22A has a substantially rectangular shape when viewed from the axial direction. The first permanent magnet 50A includes an outer diameter side end surface 51A facing the outer diameter side wall surface 221A of the first magnet insertion hole 22A, an inner diameter side end surface 52A facing the inner diameter side wall surface 222A of the first magnet insertion hole 22A, and an outer side. The q-axis side end surface 53A extending from the circumferential q-axis side end of the radial end surface 51A to the q-axis side end of the inner diameter side end surface 52A, and the d-axis side end of the outer diameter side end surface 51A in the circumferential direction. It has a d-axis side end surface 54A extending from the portion to the d-axis side end portion of the inner diameter side end surface 52A. In the first magnet insertion hole 22A, a q-axis side gap portion 224A is formed on the outer side in the circumferential direction of the q-axis side end surface 53A, and a d-axis side gap portion 225A is formed on the outer side in the circumferential direction of the d-axis side end face 54A.

The second permanent magnet 50B inserted into the second magnet insertion hole 22B has a substantially rectangular shape when viewed from the axial direction. The second permanent magnet 50B includes an outer diameter side end surface 51B facing the outer diameter side wall surface 221B of the second magnet insertion hole 22B, an inner diameter side end surface 52B facing the inner diameter side wall surface 222B of the second magnet insertion hole 22B, and an outer side. The q-axis side end surface 53B extending from the circumferential q-axis side end of the radial end surface 51B to the q-axis side end of the inner diameter side end surface 52B, and the d-axis side end of the outer diameter side end surface 51B in the circumferential direction. It has a d-axis side end surface 54B extending from the portion to the d-axis side end portion of the inner diameter side end surface 52B. In the second magnet insertion hole 22B, a q-axis side gap portion 224B is formed on the outer side in the circumferential direction of the q-axis side end surface 53B, and a d-axis side gap portion 225B is formed on the outer side in the circumferential direction of the d-axis side end face 54B.

The connecting rib 25 is provided between the q-axis side gap 224A of the first magnet insertion hole 22A and the outer peripheral surface 20a of the rotor core 20, the q-axis side gap 224B of the second magnet insertion hole 22B, and the outer circumference of the rotor core 20. It is formed between the surface 20a and the surface 20a.

The chamfering portion 55 is formed on the outer diameter side end portion 501Aa of the axial end surface 501A of the first permanent magnet 50A and the outer diameter side end portion 501Ba of the axial end surface 501B of the second permanent magnet 50B. In the present embodiment, the outer diameter side end portion 501Aa of the axial end surface 501A of the first permanent magnet 50A is connected to the outer diameter side end surface 51A and the q-axis side end surface 53A of the first permanent magnet 50A when viewed from the axial direction. It is the part to do. The outer diameter side end portion 501Ba of the axial end surface 501B of the second permanent magnet 50B is a portion connected to the outer diameter side end surface 51B and the q-axis side end surface 53B of the second permanent magnet 50B when viewed from the axial direction.

Therefore, even if a centrifugal force acts on the first permanent magnet 50A and the second permanent magnet 50B due to the rotation of the rotor 10 and the first permanent magnet 50A and the second permanent magnet 50B are displaced outward in the radial direction, the first permanent magnet is permanent. The outer diameter side end portion 501Aa of the axial end surface 501A of the magnet 50A and the outer diameter side end portion 501Ba of the axial end surface 501B of the second permanent magnet 50B were arranged at the outermost ends in the axial direction of the rotor core 20. Does not come into contact with the electromagnetic steel plate 200a.

As a result, even if centrifugal force acts on the first permanent magnet 50A and the second permanent magnet 50B due to the rotation of the rotor 10, the electromagnetic steel plate 200a arranged at the outermost end in the axial direction of the rotor core 20 is the first permanent magnet. It does not receive a radial outward centrifugal load from the 50A and the second permanent magnet 50B. As a result, although the sleeve member 40 surrounds only a part of the outer peripheral surface of the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, the rotation of the rotor 10 causes the first permanent magnet 50A and Even if a centrifugal force acts on the second permanent magnet 50B, the electromagnetic steel sheet 200a arranged at the outermost end in the axial direction of the rotor core 20, particularly the connecting rib 25 formed on the electrical steel sheet 200a, is radially outside. It can be prevented from being deformed.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be appropriately modified, improved, and the like.

For example, the axial end 601 of the resin 60 filled in the magnet insertion hole 22 is assumed to coincide with the axial inner end 551 of the chamfer 55 in the axial direction, but the magnet is inserted. The axial end 601 of the resin 60 filled in the hole 22 may coincide with the axial end 401 of the sleeve member 40 in the axial direction. Even in this way, when a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10, the centrifugal load received from the permanent magnet 50 is axially transmitted through the resin 60, and the outer peripheral surface 20a of the rotor core 20 is sleeved. It is possible to prevent transmission to the region S not surrounded by the member 40.

Further, the axial end portion 601 of the resin 60 filled in the magnet insertion hole 22 may be located inside the inner end portion 551 of the chamfered portion 55 in the axial direction in the axial direction. Even in this way, when a centrifugal force acts on the permanent magnet 50 due to the rotation of the rotor 10, the centrifugal load received from the permanent magnet 50 is transmitted through the resin 60 in the axial direction of the magnet insertion hole 22 of the rotor core 20. Of the outer diameter side wall surface 221, it is possible to prevent transmission to the non-contact portion 221a which faces the chamfered portion 55 of the permanent magnet 50 in the radial direction.

Further, for example, in the second embodiment, the outer diameter side end portion 501Aa of the axial end surface 501A of the first permanent magnet 50A on which the chamfering portion 55 is formed is the first permanent magnet 50A when viewed from the axial direction. The outer diameter side end portion 501Ba of the axial end surface 501B of the second permanent magnet 50B, which is a portion connected to the outer diameter side end surface 51A and the q-axis side end surface 53A and has the chamfered portion 55 formed therein, is in the axial direction. It is assumed that the second permanent magnet 50B is connected to the outer diameter side end surface 51B and the q-axis side end surface 53B, but the chamfered portion 55 is formed in the axial direction of the first permanent magnet 50A. The outer diameter side end portion 501Aa of the end surface 501A is a portion connected to the outer diameter side end surface 51A of the first permanent magnet 50A when viewed from the axial direction, and is a portion of the second permanent magnet 50B on which the chamfered portion 55 is formed. The outer diameter side end portion 501Ba of the axial end surface 501B may be a portion connected to the outer diameter side end surface 51B of the second permanent magnet 50B when viewed from the axial direction. That is, a surface is formed on a portion connected to the q-axis side end surface 53A of the axial end surface 501A of the first permanent magnet 50A and a portion connected to the q-axis side end surface 53B of the axial end surface 501B of the second permanent magnet 50B. The chamfer 55 may not be formed. The q-axis side gap portion 224A is formed in the first magnet insertion hole 22A on the outer side in the circumferential direction of the q-axis side end surface 53A of the first permanent magnet 50A, and the second permanent magnet is formed in the second magnet insertion hole 22B. Since the q-axis side gap 224B is formed on the outer side of the q-axis side end surface 53B of 50B in the circumferential direction, centrifugal force acts on the first permanent magnet 50A and the second permanent magnet 50B by the rotation of the rotor 10, and the first Even if the permanent magnets 50A and the second permanent magnets 50B are displaced outward in the radial direction, the q-axis side end faces 53A of the first permanent magnets 50A and the q-axis side end faces 53B of the second permanent magnets 50B come into contact with the rotor core 20. Is rare. Therefore, the portion of the first permanent magnet 50A connected to the q-axis side end surface 53A of the axial end surface 501A and the portion of the second permanent magnet 50B connected to the q-axis side end surface 53B of the axial end surface 501B have surfaces. Even if the take portion 55 is not formed, the electromagnetic steel plate 200a arranged at the outermost end in the axial direction of the rotor core 20 applies a centrifugal load in the radial outward direction from the first permanent magnet 50A and the second permanent magnet 50B. Since it is rarely received, the electromagnetic steel plate 200a arranged at the outermost end in the axial direction of the rotor core 20, particularly the connecting rib 25 formed on the electromagnetic steel plate 200a, is sufficiently deformed to the outside in the radial direction. Can be prevented.

In addition, at least the following matters are described in this specification. The components and the like corresponding to the above-described embodiments are shown in parentheses, but the present invention is not limited thereto.

(1) A rotor core (rotor core 20) formed by laminating a plurality of substantially ring-shaped electromagnetic steel sheets (electrical steel sheets 200) in the axial direction.
A plurality of magnetic pole portions (magnetic pole portions 30) formed on the rotor core at predetermined intervals in the circumferential direction,
A substantially cylindrical sleeve member (sleeve member 40) fixed to the outer peripheral surface (outer peripheral surface 20a) of the rotor core is provided.
Each magnetic pole portion has at least one magnet insertion hole (magnet insertion hole 22) penetrating the rotor core in the axial direction, and a permanent magnet (permanent magnet 50) inserted into the magnet insertion hole. Rotor (rotor 10)
The rotor core has an outer diameter side yoke portion (outer diameter side yoke portion 23) formed on the outer side in the radial direction of the magnet insertion hole and an inner diameter side yoke portion formed on the inner diameter side of the magnet insertion hole. It has (inner diameter side yoke portion 24) and a connecting rib (connecting rib 25) that connects the outer diameter side yoke portion and the inner diameter side yoke portion on the outer peripheral surface of the rotor core.
The sleeve member is arranged so that the axial end portion (end portion 401) is inside the axial end surface (end surface 201) of the rotor core.
The permanent magnet is arranged so that the end face (end face 501) in the axial direction substantially coincides with the end face in the axial direction of the rotor core in the axial direction.
A chamfered portion (chamfered portion 55) is formed at the outer diameter side end portion (outer diameter side end portion 501a) of the end face of the permanent magnet in the axial direction.
The axial length (axial length L1) of the chamfered portion is the axial thickness (thickness t) of the electromagnetic steel plate (electromagnetic steel plate 200a) arranged at the outermost end of the rotor core in the axial direction. ) Longer, rotary electric rotor.

According to (1), since a sleeve member having a substantially cylindrical shape is fixed to the outer peripheral surface of the rotor core, the rotor core is subjected to a centrifugal load in the radial direction from the permanent magnet due to the centrifugal force of the permanent magnet when the rotor is rotated. The sleeve member can prevent the rotor core, especially the connecting ribs, from being radially outwardly deformed when subjected to. As a result, the wall thickness in the radial direction of the connecting rib can be made smaller, so that the leakage flux of the permanent magnet short-circuited through the connecting rib can be reduced, and the output of the rotary electric machine can be increased.
Further, since the sleeve member is arranged so that the end portion in the axial direction is inside the axial end surface of the rotor core in the axial direction, the sleeve member is radially outside the rotor core when the rotor is rotated. It is possible to prevent the sleeve member from being damaged when a centrifugal load is applied in the direction.
Further, since the permanent magnets are arranged so that the end faces in the axial direction substantially coincide with the end faces in the axial direction of the rotor core in the axial direction, the amount of magnets in the rotor can be increased, and the rotary electric machine can be output at high output. Can be changed. In addition, the axial length of the chamfer formed at the outer diameter side end of the axial end face of the permanent magnet is the axial thickness of the electromagnetic steel plate arranged at the outermost axial end of the rotor core. Because it is longer than that, even if centrifugal force acts on the permanent magnet due to the rotation of the rotor, the outer diameter side end of the axial end face of the permanent magnet will be on the electromagnetic steel plate arranged at the outermost end in the axial direction of the rotor core. Does not contact. As a result, the sleeve member is arranged so that the end portion in the axial direction is inside the axial end surface of the rotor core in the axial direction, so that the sleeve member is arranged at the outermost end portion in the axial direction of the rotor core. Despite the fact that it surrounds only a part of the outer peripheral surface of the electrical steel sheet, even if centrifugal force acts on the permanent magnet due to the rotation of the rotor, the electrical steel sheet placed at the outermost end in the axial direction of the rotor core, especially , It is possible to prevent the connecting ribs formed on the electromagnetic steel sheet from being deformed outward in the radial direction.

(2) The rotor of the rotary electric machine according to (1).
A rotor of a rotary electric machine whose radial length (radial length L2) of the chamfered portion is equal to or less than the axial length of the chamfered portion.

According to (2), since the radial length of the chamfered portion is equal to or less than the axial length of the chamfered portion, the outermost end in the axial direction of the rotor core is suppressed while suppressing the decrease in the amount of the permanent magnet. It is possible to prevent the connecting ribs formed on the electromagnetic steel sheets arranged in the above from being deformed outward in the radial direction.

(3) The rotor of the rotary electric machine according to (1) or (2).
The magnet insertion hole is filled with a resin (resin 60).
The axial end (end 601) of the resin coincides with, in the axial direction, the axial end of the sleeve member, or more than the axial end of the sleeve member. Rotating electric rotor located inside.

According to (3), the magnet insertion hole is filled with resin, and the axial end of the resin coincides with the axial end of the sleeve member in the axial direction, or the sleeve member. It is located inside the axial end of. As a result, when centrifugal force acts on the permanent magnet due to the rotation of the rotor, the centrifugal load received from the permanent magnet is transmitted to the region where the outer peripheral surface of the rotor core is not surrounded by the sleeve member in the axial direction via the resin. Can be prevented.

(4) The rotor of the rotary electric machine according to (1) or (2).
The magnet insertion hole is filled with a resin (resin 60).
The axial end (end 601) of the resin is an axial inner end surface (inner end surface 200a1) of the electromagnetic steel sheet arranged at the outermost end of the rotor core in the axial direction in the axial direction. Rotor of rotary electric machine located inside.

According to (4), the magnet insertion hole is filled with resin, and the axial end of the resin is the axial direction of the electromagnetic steel sheet arranged at the outermost end in the axial direction of the rotor core in the axial direction. It is located inside the inner end face of. As a result, when a centrifugal force acts on the permanent magnet due to the rotation of the rotor, the centrifugal load received from the permanent magnet is transmitted to the electromagnetic steel plate arranged at the outermost end in the axial direction of the rotor core via the resin. Can be prevented.

(5) The rotor of the rotary electric machine according to (1) or (2).
The magnet insertion hole is filled with a resin (resin 60).
The axial end (end 601) of the resin coincides with the axial inner end (inner end 551) of the chamfer in the axial direction, or the chamfered portion. A rotor of a rotary electric machine located inside the inner end in the axial direction.

According to (5), the magnet insertion hole is filled with resin, and the axial end of the resin coincides with the axial inner end of the chamfered portion in the axial direction, or It is located inside the inner end of the chamfered portion in the axial direction. In the axial direction, of the magnet insertion holes of the rotor core, the portion that faces the chamfered portion of the permanent magnet in the radial direction does not come into contact with the permanent magnet even if centrifugal force acts on the permanent magnet due to the rotation of the rotor. Therefore, when a centrifugal force acts on the permanent magnet due to the rotation of the rotor, the centrifugal load received from the permanent magnet is applied to the chamfered portion and the diameter of the permanent magnet among the magnet insertion holes of the rotor core in the axial direction via the resin. It is possible to prevent transmission to the portions facing each other in the direction.

10 Rotor 20 Rotor core 20a Outer peripheral surface 200, 200a Electromagnetic steel plate 200a1 Inner end surface 201 End surface 22 Magnet insertion hole 23 Outer diameter side yoke part 24 Inner diameter side yoke part 25 Connection rib 30 Magnetic pole part 40 Sleeve member 401 End part 50 Permanent magnet 501 End face 501a Outer diameter side end 55 Chamfered part 551 Inner end 60 Resin 601 End L1 Axial length L2 Radial length t Thickness

Claims (5)

A rotor core formed by laminating a plurality of substantially ring-shaped electrical steel sheets in the axial direction,
A plurality of magnetic pole portions formed on the rotor core at predetermined intervals in the circumferential direction,
A substantially cylindrical sleeve member fixed to the outer peripheral surface of the rotor core is provided.
Each magnetic pole portion is a rotor of a rotary electric machine having at least one magnet insertion hole penetrating the rotor core in the axial direction and a permanent magnet inserted into the magnet insertion hole.
The rotor core has an outer diameter side yoke portion formed on the outer side in the radial direction of the magnet insertion hole, an inner diameter side yoke portion formed on the inner side in the radial direction of the magnet insertion hole, and the outer diameter side yoke portion. It has a connecting rib that connects the inner diameter side yoke portion and the inner diameter side yoke portion on the outer peripheral surface of the rotor core.
The sleeve member is arranged so that the axial end portion is inside the axial end surface of the rotor core in the axial direction.
The permanent magnet is arranged so that the end face in the axial direction substantially coincides with the end face in the axial direction of the rotor core in the axial direction.
A chamfered portion is formed at the outer diameter side end portion of the end face in the axial direction of the permanent magnet.
A rotor of a rotary electric machine whose axial length of the chamfered portion is longer than the axial thickness of the electromagnetic steel sheet arranged at the outermost end of the rotor core in the axial direction. The rotor of the rotary electric machine according to claim 1.
A rotor of a rotary electric machine whose radial length of the chamfered portion is equal to or less than the axial length of the chamfered portion. The rotor of the rotary electric machine according to claim 1 or 2.
The magnet insertion hole is filled with resin and
The axial end of the resin coincides with the axial end of the sleeve member in the axial direction, or is located inside the axial end of the sleeve member. Rotating electric rotor. The rotor of the rotary electric machine according to claim 1 or 2.
The magnet insertion hole is filled with resin and
The axial end of the resin is located inside the axial inner end face of the electrical steel sheet arranged at the axial outermost end of the rotor core in the axial direction. Rotor. The rotor of the rotary electric machine according to claim 1 or 2.
The magnet insertion hole is filled with resin and
The axial end of the resin coincides with the axial inner end of the chamfer in the axial direction, or is inward of the axial inner end of the chamfer. Located, the rotor of the rotary electric machine.

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