JPH099539A - Rotor of permanent magnet rotating electric machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rotor of a permanent magnet rotating electric machine which is easy to manufacture and inexpensive, and which has sufficient mechanical strength. A groove 21a extending in the axial direction is formed on the outer peripheral surface of the yoke 21 at equal intervals in the circumferential direction, and a lower portion of a partition plate 24 made of a strip-shaped nonmagnetic material is fitted into the groove 21a. The upper part is projected in the centrifugal direction, the permanent magnet 23 is attached to the surface of the yoke 21 between the partition plates 24 adjacent in the circumferential direction, and the outer peripheral surface of the permanent magnet 23 is tightly bound with the resin bind 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor of a permanent magnet rotating electric machine, and is particularly useful when applied to a rotary field type synchronous motor in which a field is formed by permanent magnets.

[0002]

2. Description of the Related Art In a rotor of a rotary field type rotary electric machine in which a permanent magnet forms a field, a rotary shaft or a circle such as a yoke fixed to the rotary shaft and integrally rotated with the rotary shaft is provided by some means. It is necessary to fix the permanent magnet to the columnar member.

3 to 7 are explanatory views conceptually showing this type of rotor according to the prior art.

In the rotor shown in FIG. 3, convex portions 1a and 1b are provided at two opposing positions on the inner peripheral surface of the ring-shaped permanent magnet 1 shown in FIG. As shown in FIG. 1, the convex portion 1 is formed in the grooves 2a and 2b formed on the rotary shaft 2 in the axial direction.
The permanent magnet 1 is moved in the axial direction of the rotary shaft 2 by fitting together a and 1b, is fitted into the rotary shaft 2, and is fastened with a clamp 3.

In the rotor shown in FIG. 4, a groove 4a having a tab-tail cross section is formed on the surface of the rotary shaft 4 in the axial direction, and the groove 4 is formed on both side surfaces of a rod-shaped permanent magnet 5.
Tapered surfaces 5a and 5b matching the shape of a are formed, and the permanent magnet 5 is fitted into the groove 4a.

In the rotor shown in FIG. 5, a rod-shaped permanent magnet 7 formed so as to have an arcuate inner peripheral surface whose cross-sectional shape is the same as that of the rotating shaft 7 is attached to the surface of the rotating shaft 6 with an adhesive. It was done.

The rotor shown in FIG. 6 includes a permanent magnet 9 integrally molded with a molding resin 8 and a permanent magnet 9
It is also fixed to the rotating shaft 10.

The rotor shown in FIG. 7 is a rod-shaped permanent magnet 1 in which the outer peripheral surface is formed in an arc shape and the inner peripheral surface is formed in a flat surface on the surface of a rotating shaft 11 which is chamfered to have a square cross section.
1 is placed and a thin-walled circular tube 13 made of a non-magnetic material is wound around the outer peripheral surface of the permanent magnet 11.

[0009]

The rotor according to the prior art as described above has the following problems.

In the rotor shown in FIG. 3, since the expansion coefficient of the permanent magnet 1 is negative (the diameter decreases as the temperature rises),
If an iron-based material is used for the rotary shaft 2, the permanent magnet 1 may crack.

In the rotor shown in FIG. 4, it takes a lot of time to process the groove 4a of the rotary shaft 4 and the tapered surfaces 5a and 5b of the permanent magnet 5, and the cost also rises.

In the rotor shown in FIG. 5, the reliability of the adhesive is low. In particular, the adhesive is strong in the shearing direction, but weak in the tensile direction, and there are many variations. Therefore, it is anxious to rely solely on the adhesive to resist the centrifugal force.

The rotor shown in FIG. 6 is expensive except for the case where there are many lots, but the equipment and the like are expensive.

In the rotor shown in FIG. 7, it takes a lot of time to process the rotary shaft 11.

The present invention has been made in view of the above prior art, and an object thereof is to provide a rotor of a permanent magnet rotating electric machine which is easy to manufacture and inexpensive, and which can sufficiently secure mechanical strength.

[0016]

The structure of the present invention that achieves the above object has the following features.

(1) A cylindrical member, which is a rotary shaft or a yoke fixed to the rotary shaft and rotating integrally with the rotary shaft, and a cylindrical member extending axially at a plurality of circumferential positions of the cylindrical member. Partitioned by a plurality of grooves formed on the outer peripheral surface, a non-magnetic partition plate with a lower part fitted in each groove and an upper part protruding in the centrifugal direction of the cylindrical member, and a partition plate adjacent to the cylindrical member And a permanent magnet attached to each surface of the part.

(2) A cylindrical member which is a rotary shaft or a yoke fixed to the rotary shaft and rotating integrally with the rotary shaft, and a cylindrical member extending axially at a plurality of circumferential positions of the cylindrical member. A plurality of grooves formed on the outer peripheral surface, a partition plate made of a non-magnetic material, a lower part of which is fitted in each groove and an upper part of which projects in the centrifugal direction of the cylindrical member, and a partition plate which is adjacent to the cylindrical member in the circumferential direction. It has a permanent magnet attached to each surface of the part partitioned by, and a bind for binding each permanent magnet by winding around the outer peripheral surface of the permanent magnet.

(3) In (1) or (2), each permanent magnet is divided into a plurality in the axial direction.

[0020]

According to the present invention having the above-mentioned structure, the permanent magnets are attached by being placed on the surface of the cylindrical member through the space between the partition plates adjacent to each other in the circumferential direction of the cylindrical member.

At this time, each partition plate suppresses the interaction due to the magnetic force of the permanent magnet, and regulates the position of each permanent magnet. That is, when there is no partition plate, it is not easy to position the permanent magnet at a predetermined position by the repulsive force acting in the adjacent permanent magnets, and a special jig may be required in some cases.

Further, in the case of having a bind, since the centrifugal force is opposed by the bind, the permanent magnet can be stably fixed.

When the permanent magnet is divided into a plurality of pieces, the positioning as described above becomes easier, and by standardizing the permanent magnets, the permanent magnets can be commonly used for rotating electric machines having different capacities, and the rotor can be easily manufactured.

[0024]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a front view showing a rotor according to an embodiment of the present invention, and FIG. 2 is a perspective view thereof.

As shown in both figures, the yoke 21, which is a columnar member, has a rotating shaft 2 which penetrates the central portion thereof in the axial direction.
It is fixed to the rotary shaft 21 and is configured to rotate integrally with the rotary shaft 21. The grooves 21a are formed so as to extend in the axial direction at a plurality of positions (eight in this embodiment) in the circumferential direction of the yoke 21.

A strip-shaped partition plate 21 made of a non-magnetic material
Is formed so that the lower portions thereof are fitted into the respective grooves 21a and the upper portions thereof project in the centrifugal direction of the yoke 21. As a result, a plurality of (eight in this embodiment) spaces are formed between the partition plates 24 adjacent to each other in the circumferential direction of the yoke 21.

The permanent magnets 23 are adhered to the respective surfaces of the portions partitioned by the partition plates 24 which are adjacent to each other in the circumferential direction of the yoke 21 with an adhesive, and are tightly bound with the resin bind 25 wound around the outer peripheral surface thereof. is there. Further, the permanent magnet 23 in this embodiment is formed by arranging a plurality of magnet pieces 23a divided into a plurality of pieces in the axial direction.

In the present embodiment, the magnet pieces 23a are attached by being placed on the surface of the yoke 21 through the space between the partition plates 24 adjacent to each other in the circumferential direction of the yoke 21.

At this time, each partition plate 24 suppresses the interaction due to the magnetic force of the magnet pieces 24a and regulates the position of each magnet piece 24a to facilitate the bonding work.

The permanent magnet 23 is firmly fixed to the surface of the yoke 21 by the binding force of the adhesive and the resin binding.

The cylindrical member in the above embodiment is the yoke 2
It is not limited to 1. In some cases, the rotary shaft may be used as a cylindrical member, and the permanent magnet 23 may be directly attached to the surface of the rotary shaft. Further, the permanent magnet 23 does not necessarily have to be an assembly of the magnet pieces 23a, but when the magnet pieces 23a are formed in this way, handling at the time of work such as bonding work is easy, and by standardization, It is possible to appropriately select and combine the magnet pieces 23a in a number corresponding to the capacity of the rotating electric machine.

Further, the binding with the resin bind 25 can be omitted for the use in which the adhesive has sufficient strength.

[0034]

As described above in detail with reference to the embodiments, according to the present invention, a groove for inserting a partition plate is formed in a cylindrical member such as a yoke in order to fix a permanent magnet. It is only necessary to do so, and this cylindrical member can be easily processed. Further, since there is a partition plate made of a non-magnetic material between the permanent magnets adjacent in the circumferential direction of the cylindrical member, the influence of the repulsive force due to the magnetic force of the permanent magnet is reduced and the position of the permanent magnet is restricted. This permanent magnet sticking operation can be performed efficiently.

Further, in the case of having the binding, the centrifugal force effectively acting on the permanent magnet can be effectively countered, so that the reliability is improved.

When the permanent magnet is divided into a plurality of pieces, the positioning as described above is further facilitated, and by standardizing the permanent magnets, the permanent magnets can be commonly used for rotating electric machines of different capacities, and the manufacturing of the rotor is facilitated. Can also be reduced.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing the above embodiment.

FIG. 3 is an explanatory view conceptually showing a first conventional technique.

FIG. 4 is an explanatory view conceptually showing a second conventional technique.

FIG. 5 is an explanatory view conceptually showing a third conventional technique.

FIG. 6 is an explanatory view conceptually showing a fourth conventional technique.

FIG. 7 is an explanatory view conceptually showing a fifth conventional technique.

[Explanation of symbols]

 21 yoke 21a groove 22 rotary shaft 23 permanent magnet 23a magnet piece 24 partition plate 25 resin bind

Claims (3)

[Claims] 1. A cylindrical member, which is a rotary shaft or a yoke fixed to the rotary shaft and rotating integrally with the rotary shaft, and an outer periphery of the cylindrical member that extends in the axial direction at a plurality of circumferential positions of the cylindrical member. A plurality of grooves formed on the surface, a non-magnetic partition plate in which the lower part is fitted in each groove and the upper part projects in the centrifugal direction of the cylindrical member, and the part partitioned by the adjacent partition plate of the cylindrical member And a permanent magnet attached to each surface of the rotor of the permanent magnet rotating electric machine. 2. A cylindrical member, which is a rotary shaft or a yoke fixed to the rotary shaft and rotating integrally with the rotary shaft, and an outer periphery of the cylindrical member that extends in the axial direction at a plurality of circumferential positions of the cylindrical member. With a plurality of grooves formed on the surface, a non-magnetic partition plate with a lower part fitted in each groove and an upper part protruding in the centrifugal direction of the cylindrical member, and a partition plate adjacent in the circumferential direction of the cylindrical member. A rotor for a permanent magnet rotating electric machine, comprising: a permanent magnet attached to each surface of the partitioned portion; and a bind wound around the outer peripheral surface of the permanent magnet to bind each permanent magnet tightly. 3. The rotor of a permanent magnet rotating electric machine according to claim 1 or 2, wherein each permanent magnet is divided into a plurality in the axial direction.