JP2002204540A - Permanent magnet rotor for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a permanent magnet rotor for a rotating electric machine capable of attaining high productivity. SOLUTION: In this permanent magnet rotor for a rotating electric machine, where a cylindrical permanent magnet 12 is fitted onto the outer peripheral surface of a stepped part 11a formed with a large diameter at a part in the axial direction of a rotor shaft 11, and adhesively fixed on the stepped part 11a, there is provided a cap 14 formed of a nonmagnetic member comprising a cylindrical part 15 and a pair of collar parts 16 formed by being extended inward from both ends of the cylindrical part 15, covering the outer-periphery surface of the permanent magnet 12 by the cylindrical part 15 and covering both end surfaces, respectively, in the axial direction of the stepped part 11a and the permanent magnet 12 of the rotor shaft 11 by both the collar parts 16, thereby forming a recessed part 16a at such a position as to face a fitting part between the permanent magnet 12 at the inner surfaces of both the collar parts 16 and the stepped part 11a of the rotor shaft 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a permanent magnet rotor of a rotary electric machine in which a cylindrical permanent magnet is mounted on an outer periphery of a rotor shaft of the rotary electric machine.

[0002]

2. Description of the Related Art As shown in FIG. 6, a conventional permanent magnet rotor of a general rotary electric machine of this kind has a stepped portion 1a having a large diameter at a part near the center in the axial direction. Axis 1;
The rotor shaft 1 includes a cylindrical permanent magnet 2 fitted to the outer peripheral portion of the step portion 1a. The stepped portion 1a of the rotor shaft 1 and the permanent magnet 2 are adhered by an adhesive 3 filled between their fitting surfaces, and are fixedly integrated.

[0003]

Since the conventional permanent magnet rotor of the rotating electric machine is constructed as described above, the step portion 1a of the rotor shaft 1 and the permanent magnet 2 are bonded together when the permanent magnet 2 is bonded. The applied adhesive 3 protrudes to the axial end as shown in FIG. The protruding portion 3a is scattered during rotation or generates local projections due to the scatter, so that stress is concentrated during operation and the fatigue strength of the adhesive 3 is reduced. .

For this reason, for example, Japanese Patent Application Laid-Open No. Hei 9-140078
In the gazette, although not shown, it is proposed that the protruding portion 3a is formed into a round shape by using a jig to reduce stress concentration and improve the fatigue strength of the adhesive 3. However, in this case, since the protruding adhesive 3 adheres to the jig, it is necessary to remove the adhered adhesive 3 from the jig and perform cleaning, etc., which lowers the assembling workability and, consequently, the productivity. However, there is a problem that the temperature decreases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and eliminates the need to remove and clean the adhesive protruding from the axial end, thereby improving productivity. It is an object of the present invention to provide a permanent magnet rotor for a rotating electric machine.

[0006]

According to a first aspect of the present invention, there is provided a permanent magnet rotor for a rotating electric machine, wherein an outer peripheral surface of a step portion formed to have a large diameter in a part of the rotor shaft in the axial direction. In a permanent magnet rotor of a rotating electrical machine in which a cylindrical permanent magnet is fitted and fixed to a step portion by bonding, a pair of cylindrical portions are formed extending inward from both ends of the cylindrical portion and the cylindrical portion. The outer peripheral surface of the permanent magnet is covered with the cylindrical portion, the stepped portion of the rotor shaft and both end surfaces in the axial direction of the permanent magnet are respectively covered with the two flange portions, and the permanent magnet and the rotor on the inner surface of both the flange portions are covered. A cap made of a non-magnetic member having a recess formed at a position facing a fitting portion with the step of the shaft is provided.

According to a second aspect of the present invention, there is provided a permanent magnet rotor for a rotary electric machine according to the first aspect, wherein the recess is formed so as to extend to the vicinity of the cylindrical portion.

According to a third aspect of the present invention, there is provided a permanent magnet rotor for a rotary electric machine according to the second aspect, wherein the concave portion is formed in a tapered shape such that the cylindrical portion gradually becomes deeper. .

According to a fourth aspect of the present invention, there is provided a permanent magnet rotor for a rotary electric machine according to any one of the first to third aspects, wherein the recessed portion is formed with a recessed portion and a recessed portion of a flange portion. The surface is formed with a predetermined number of small holes communicating with both sides different from each other.

According to a fifth aspect of the present invention, there is provided a permanent magnet rotor for a rotating electric machine according to any one of the first to third aspects, wherein a permanent magnet is provided at an end on an inner surface of the cylindrical portion facing the outer peripheral surface of the permanent magnet. Are formed to form a plurality of protruding portions which are in contact with the outer peripheral surface of the hologram.

According to a sixth aspect of the present invention, there is provided a permanent magnet rotor for a rotating electric machine, wherein the cap is formed of an aluminum member in any one of the first to fifth aspects.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a sectional view showing a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 1 of the present invention.
In the drawing, reference numeral 11 denotes a rotor shaft having a large diameter at a substantially central portion in the axial direction and having a step portion 11a formed thereon, and 12 denotes a length of the rotor shaft 11 substantially equal to the step portion 11a in the axial direction. The adhesive 13 is fitted to the outer peripheral surface of the step 11a and is filled in the gap between the step 13a and the cylindrical permanent magnet.
Is adhered and fixed.

Reference numeral 14 denotes a cylindrical portion 15 fitted to the outer peripheral surface of the permanent magnet 12, and formed inward from both ends of the cylindrical portion 15 so as to extend along the end surfaces of the permanent magnet 12 and the step portion 11a. The cap 16 is formed of a pair of flanges 16, and a recess 16 a is formed on the inner surface of both flanges 16 at a position facing the fitting portion between the permanent magnet 12 and the step 11 a of the rotor shaft 11. The adhesive 13 is formed so as to cover and store the protruding portions 13a. The cap 14 is formed of a non-magnetic member such as a resin molding member, an aluminum member, or the like, and is configured by integrating two members divided at the axial center of the cylindrical portion 15. I have.

As described above, according to the first embodiment, the outer peripheral surface of the permanent magnet 12 is formed by the cylindrical portion 15 of the cap 14, and the step 11 a of the rotor shaft 11 and both end surfaces of the permanent magnet 12 are formed by the two flange portions 16. Since the protruding portions 13a protruding from both ends in the axial direction of the adhesive 13 are stored in the recessed portions 16a formed on the inner surfaces of the both flange portions 16, respectively.
The adhesive 13 is prevented from being scattered during rotation and leaking to the outer surface, and the removal and cleaning work of the adhesive 13 is not required, so that the assembling workability is improved and the productivity can be improved. become.

The cap 14 needs to be non-magnetic in function. However, by using a light metal member such as an aluminum member as described above, the rotational inertia of the rotor shaft 11 can be reduced. The removal of the adhesive 13 and the cleaning operation can be made unnecessary without hindering the start-up characteristics and the like by minimizing the increase in the temperature.

Embodiment 2 FIG. 2 is a sectional view showing a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 2 of the present invention. In FIG. 2, the same portions as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 17
Is a cylindrical portion 18 fitted to the outer peripheral surface of the permanent magnet 12, and the permanent magnet 12
And a pair of flanges 19 formed extending along the end face of the step 11a of the rotor shaft 11. The permanent magnet 12 and the rotor shaft 11 on the inner surfaces of both flanges 19 are provided.
Of the cylindrical portion 1 from the position facing the fitting portion with the step portion 11a.
A concave portion 19a formed in a tapered shape such that the cylindrical portion 18 side becomes deeper in order to the vicinity of 8 is formed so as to cover and store the protruding portion 13a of the adhesive 13. Like the cap 14 in the first embodiment, the cap 17 is formed of, for example, an aluminum member, and is configured by integrating two members divided at the axial center of the cylindrical portion 18. I have.

As described above, according to the second embodiment, similarly to the first embodiment, the cylindrical portion 1 of the cap 17 is provided.
8, the outer peripheral surface of the permanent magnet 12
One end portion 11a and both end surfaces of the permanent magnet 12 are respectively covered, and a protruding portion 13b protruding from both ends in the axial direction of the adhesive 13 is stored in a concave portion 19a formed on the inner surface of both flange portions 19. The adhesive 13 is prevented from scattering during rotation and leaking to the outer surface,
Since the removal and cleaning work of the adhesive 13 becomes unnecessary, the assembling workability is improved, and the productivity can be improved.
Further, since the concave portion 19a is formed in a tapered shape so as to reach the vicinity of the cylindrical portion 18 and the cylindrical portion 18 side becomes gradually deeper, the adhesive 13 accumulated in the concave portion 19a is formed.
Can be easily wrapped around the outer peripheral surface side of the permanent magnet 12, and bonding between the outer peripheral surface of the permanent magnet 12 and the inner peripheral surface of the cap 17 becomes possible.

Embodiment 3 FIG. 3 is a sectional view showing a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 3 of the present invention. In the figure, the same components as those in the first and second embodiments are denoted by the same reference numerals, and description thereof is omitted.
Reference numeral 20 denotes a cylindrical portion 21 fitted to the outer peripheral surface of the permanent magnet 12 and the permanent magnet 1
2 and a pair of flanges 22 formed extending along the end face of the step 11a of the rotor shaft 11. The permanent magnet 12 on the inner surface of both flanges 22 and the rotor A recess 22a is formed at a position facing the fitting portion of the shaft 11 with the step portion 11a so as to cover and store the protruding portion 13a of the adhesive 13, and unlike the cap 14, the inner surface of the cylindrical portion 21 is formed. A plurality of protrusions 21a are formed, and the tips of the protrusions 21a are in contact with the outer peripheral surface of the permanent magnet 12. And, like the caps 14 and 17 in the first and second embodiments, the cap 20 is formed of, for example, an aluminum member and integrates two members divided at the axial center of the cylindrical portion 21. It is constituted by.

According to the third embodiment, as in the first embodiment, the cylindrical portion 2 of the cap 20 is formed.
1 and the outer circumferential surface of the permanent magnet 12
The two end faces of the step portion 11a and the permanent magnet 12 are respectively covered, and the protruding portions 13a protruding from both ends in the axial direction of the adhesive 13 are stored in the recessed portions 22a formed on the inner surfaces of the both flange portions 22. The adhesive 13 is prevented from scattering during rotation and leaking to the outer surface,
Since the removal and cleaning work of the adhesive 13 becomes unnecessary, the assembling workability is improved, and the productivity can be improved.
Furthermore, since the permanent magnet 12 is point-contacted and elastically held by the projection 21a formed on the inner peripheral surface of the cap 20, the permanent magnet 12 can be easily centered with respect to the rotor shaft 11. As a result, characteristics such as cogging torque and torque ripple can be improved.

Embodiment 4 FIG. 4 is a sectional view showing a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 4 of the present invention. In the figure, each of the first to third embodiments is described.
The same parts as those in are denoted by the same reference numerals and description thereof is omitted. Reference numeral 23 denotes a cylindrical portion 24 fitted on the outer peripheral surface of the permanent magnet 12, similarly to the cap 17 in the second embodiment.
A cap composed of the permanent magnet 12 and a pair of flanges 25 formed along the end face of the step portion 11a of the rotor shaft 11 inward from both ends of the cylindrical portion 24, respectively. The tapered shape is formed such that the cylindrical portion 24 side is gradually deepened from the position on the inner surface of both flange portions 25 facing the fitting portion between the permanent magnet 12 and the step portion 11a of the rotor shaft 11 to the vicinity of the cylindrical portion 24. The recessed portion 25 a is formed so as to cover and store the protruding portion 13 a of the adhesive 13, and unlike the cap 17, on the inner surface of the cylindrical portion 24,
A plurality of projections 24 a are formed, and the tips of the projections 21 a are in contact with the outer peripheral surface of the permanent magnet 12. And
The cap 23 is formed of, for example, an aluminum member, and integrates two members divided at the axial center of the cylindrical portion 24, similarly to the caps 14, 17, and 20 in the first to third embodiments. It is constituted by.

As described above, according to the fourth embodiment, similarly to the second embodiment, the cylindrical portion 2 of the cap 23 is formed.
4, the outer peripheral surface of the permanent magnet 12
The two end faces of the step portion 11a and the permanent magnet 12 are respectively covered, and the protruding portions 13b protruding from both ends in the axial direction of the adhesive 13 are stored in the recessed portions 25a formed on the inner surfaces of the both flange portions 25. The adhesive 13 is prevented from scattering during rotation and leaking to the outer surface,
Since the removal and cleaning work of the adhesive 13 becomes unnecessary, the assembling workability is improved, and the productivity can be improved.
Furthermore, since the concave portion 25a is formed in a tapered shape so as to reach the vicinity of the cylindrical portion 24 and the cylindrical portion 24 side becomes gradually deeper, the adhesive 1 accumulated in the concave portion 25a is formed.
3 can easily move around the outer peripheral surface side of the permanent magnet 12, so that the outer peripheral surface of the permanent magnet 12 and the inner peripheral surface of the cap 23 can be bonded together.
Are point-contacted and elastically held by the projections 24a formed on the inner peripheral surface of the cap 23.
Can be easily centered with respect to the rotor shaft 11, and characteristics such as cogging torque and torque ripple can be improved.

Embodiment 5 FIG. 5 shows a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 5 of the present invention,
(A) is a front view, (B) is a side sectional view. In the figure, the same parts as those in each of the first to fourth embodiments are denoted by the same reference numerals, and description thereof will be omitted. Reference numeral 26 denotes a cylindrical portion 27 fitted to the outer peripheral surface of the permanent magnet 12, similarly to the cap 20 in the third embodiment, and a permanent magnet 12 and a rotor shaft 11 inside from both ends of the cylindrical portion 27. And a pair of flanges 28 formed to extend along the end face of the step 11a.
The concave portion 28a is provided with the adhesive 13 at a position facing the fitting portion between the permanent magnet 12 and the step portion 11a of the rotor shaft 11 on the inner surface of the rotor shaft 8.
The protrusions 13a are formed so as to cover and protrude from the protrusions 13a.
a is formed, and the tip of the projection 27a is
Unlike the cap 20, the concave portion 28a communicates with the outer surface side of the concave portion 28a and the cap 26, that is, the surface side different from the surface where the concave portion 28a is formed. A predetermined number of small holes 29 are formed. The cap 26 is made of, for example, an aluminum member, similarly to the caps 14, 17, 20, and 23 in the first to fourth embodiments, and is divided into two members at the axial center of the cylindrical portion 27. Are integrated.

According to the fifth embodiment, as in the third embodiment, the cylindrical portion 2 of the cap 26 is formed.
7, the outer peripheral surface of the permanent magnet 12
The two end surfaces of the step portion 11a and the permanent magnet 12 are respectively covered, and the protruding portions 13a protruding from both ends in the axial direction of the adhesive 13 are stored in the concave portions 28a formed on the inner surfaces of the both flange portions 28. The adhesive 13 is prevented from scattering during rotation and leaking to the outer surface,
Since the removal and cleaning work of the adhesive 13 becomes unnecessary, the assembling workability is improved, and the productivity can be improved.
Furthermore, since the permanent magnet 12 is point-contacted and elastically held by the projection 21a formed on the inner peripheral surface of the cap 26, the permanent magnet 12 can be easily centered with respect to the rotor shaft 11. It is possible to improve characteristics such as cogging torque and torque ripple, and of course, since the narrow hole 29 communicating with the outer surface side of the cap 26 is formed in the recess 28a, air is released when the cap 26 is mounted. Therefore, the operation of assembling the cap is facilitated, and the adhesive 13 can be used as a discharge or injection hole for supplementing excess or deficiency.

In the fifth embodiment, the cap 2
6 has been described in the case where the small hole 29 is provided in the same configuration as the cap 20 in the third embodiment,
It is needless to say that the present invention is not limited to this, and the same effect as described above can be obtained by providing a small hole in the same configuration as each of the caps 14, 17, and 23 in each of the first, second, and fourth embodiments. Needless to say, it can be demonstrated.

[0025]

As described above, according to the first aspect of the present invention, a cylindrical permanent member is formed on the outer peripheral surface of the step portion having a large diameter in a part of the rotor shaft in the axial direction. In the permanent magnet rotor of the rotating electric machine in which the magnet is fitted and fixed to the step portion by bonding, the permanent magnet rotor includes a pair of flange portions formed to extend inward from both ends of the cylindrical portion and the cylindrical portion, respectively. The outer peripheral surface of the permanent magnet is covered by the cylindrical portion, the stepped portion of the rotor shaft and both end surfaces in the axial direction of the permanent magnet are respectively covered by both flange portions, and the permanent magnet on the inner surface of both flange portions and the stepped portion of the rotor shaft are covered. Equipped with a cap made of a non-magnetic member with a recess formed at the position facing the fitting, eliminating the need to remove and clean the adhesive protruding from the axial end, and improving productivity. It is possible to provide a permanent magnet rotor of a rotating electric machine that can perform the following.

According to a second aspect of the present invention, in the first aspect, the recess is formed so as to extend to the vicinity of the cylindrical portion, so that the adhesive protruding from the axial end is used. It is possible to provide a permanent magnet rotor of a rotating electric machine capable of bonding a permanent magnet and a cap.

According to a third aspect of the present invention, in the second aspect, the concave portion is formed in a tapered shape such that the cylindrical portion side is gradually deepened, so that the adhesive protruding from the axial end portion is formed. It is possible to provide a permanent magnet rotor of a rotating electric machine, which can better adhere a permanent magnet and a cap with an agent.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the indented portion includes:
Since a predetermined number of small holes communicating with both sides different from the surface on which the recessed portion of the flange portion is formed are formed, a rotating electric machine capable of easily adjusting excess and deficiency of the adhesive. Can be provided.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the inner surface of the cylindrical portion opposed to the outer peripheral surface of the permanent magnet has a plurality of tips that contact the outer peripheral surface of the permanent magnet at the tip. Is formed, so that it is possible to provide a permanent magnet rotor of a rotating electric machine that can easily center a permanent magnet with respect to a rotor axis.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the cap is formed of an aluminum member, so that an increase in the rotational inertia of the rotor shaft is suppressed as much as possible. It is possible to provide a permanent magnet rotor of a rotating electric machine which does not need to remove an adhesive and to perform a cleaning operation without impairing start-up characteristics and the like.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view illustrating a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view illustrating a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 3 of the present invention.

FIG. 4 is a cross-sectional view illustrating a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 4 of the present invention.

FIG. 5 shows a configuration of a permanent magnet rotor of a rotary electric machine according to Embodiment 5 of the present invention, where (A) is a front view and (B)
Is a side sectional view.

FIG. 6 is a sectional view showing a configuration of a permanent magnet rotor of a conventional rotating electric machine.

[Explanation of symbols]

11 rotor shaft, 11a step, 12 permanent magnet, 13
Adhesive, 13a, 13b protrusion, 14, 17,
20,23,26 caps, 15,18,21,2
4, 27 cylindrical portion, 16, 19, 22, 25, 28 flange portion, 16a, 19a, 22a, 25a, 28a depression portion, 21a, 24a, 27a projection portion, 29 narrow hole.

Continued on the front page (72) Inventor Yuji Nakahara 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Koichiro Kamei 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Co., Ltd. In-company (72) Inventor Shigeru Shiroyama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation F-term (reference) 5H622 CA01 CA05 PP03 PP11 PP17 PP18 PP19

Claims (6)

[Claims] A cylindrical permanent magnet is fitted on the outer peripheral surface of a step formed with a large diameter in a part of the rotor shaft in the axial direction, and is fixed to the step by bonding. In the permanent magnet rotor of the rotating electric machine, a cylindrical portion and a pair of flange portions formed to extend inward from both ends of the cylindrical portion, respectively, the outer peripheral surface of the permanent magnet in the cylindrical portion, Both flanges cover the stepped portion of the rotor shaft and both end surfaces in the axial direction of the permanent magnet, respectively, and face the fitting portion between the permanent magnet and the stepped portion of the rotor shaft on the inner surface of both flanges. A permanent magnet rotor for a rotating electric machine, comprising a cap made of a non-magnetic member having a recess formed at a position. 2. The permanent magnet rotor of a rotating electric machine according to claim 1, wherein the recess is formed so as to extend to the vicinity of the cylindrical portion. 3. The concave portion is formed in a tapered shape such that the cylindrical portion side is gradually deepened.
A permanent magnet rotor for the rotating electric machine according to the above. 4. A predetermined number of small holes are formed in the recessed portion for communicating the recessed portion with both sides of the flange different from the surface on which the recessed portion is formed. The permanent magnet rotor of a rotating electric machine according to any one of claims 1 to 3, wherein 5. A plurality of projections, each of which has a distal end abutting on the outer peripheral surface of the permanent magnet, is formed on an inner surface of the cylindrical portion facing the outer peripheral surface of the permanent magnet. A permanent magnet rotor for the rotating electric machine according to any one of the above. 6. The permanent magnet rotor for a rotating electric machine according to claim 1, wherein the cap is formed of an aluminum member.