JP2001119878A - Rotor for rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the rotor of a rotating electric machine where the magnetic pole of the rotor can be assembled, removed, and manufactured easily. SOLUTION: The magnetic pole of this rotor is composed of a permanent magnet that is integrated or is divided into a plurality of portions, and a base plate where plural permanent magnets are accommodated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a rotating electric machine, and more particularly, to a method of attaching a magnetic pole to a rotor having a structural magnetic pole.

[0002]

2. Description of the Related Art A conventional technique will be described with reference to FIGS. First, in FIG. 9, a general structure of the rotor will be described. In the rotor 1, a number of permanent magnets 3 corresponding to the number of poles are arranged and adhered to the surface of a cylindrical rotor yoke 2 in the circumferential direction. Further, the rotor yoke 2 to which the permanent magnet 3 is adhered is put into a resin fixing jig, and the resin 4 is poured into a gap between the jig and the permanent magnet 3, and cooled and solidified to form a permanent. The magnet 3 is fixed to the rotor yoke 2. The rotating shaft 1 thus configured is rotatably mounted on the inner diameter side of the fixed shaft 10 having the stator winding 13 via the gap 14.

[0003] Next, FIG.
In the rotor 21 described in Japanese Patent Publication No. 4 (1993), a hole 23 is provided in the permanent magnet 22 without using an adhesive, and the permanent magnet 22 is fixed to the rotor core 24 with bolts.

[0004] In a small rotating electric machine having a permanent magnet rotor of this kind as a field, a samarium-cobalt or iron-neodymium rare earth element having a high energy product is aimed at making the rotating electric machine compact and high power. Generally, permanent magnets are mainly used. These high energy product permanent magnets are difficult to handle because they have strong attraction and repulsion and are mechanically fragile. 3-106
In the case of performing a process of drilling a hole in a fragile permanent magnet as disclosed in Japanese Patent Publication No. 854, an extremely complicated process is required for the manufacturing process of the permanent magnet, which leads to an increase in the price and an increase in cost. The removed permanent magnet loses its magnetic energy.

[0005] Even if there is such an inconvenience, a small rotating electric machine uses a small permanent magnet, so that the magnetized permanent magnet can be relatively easily attached to the rotor surface. Since the power supply capacity for magnetization is small, a method is generally adopted in which a permanent magnet before magnetization is bonded and fixed to a rotor, and then the rotor is inserted into the stator and magnetized from the stator. . However, in a middle / large rotating electric machine having a permanent magnet as a field, the permanent magnet to be used is larger than a small rotating electric machine, so that the handling of the permanent magnet becomes difficult and workability is extremely deteriorated. Particularly, since the attraction force of the permanent magnet is large, when the permanent magnet is fixed to the rotor yoke, cracking or chipping often occurs in the permanent magnet.

Recently, there has been a tendency to take measures such as reducing the torque pulsation by performing a precise optimal design of the shape of the permanent magnet by a magnetic field analysis method such as a finite element method. In this case, to realize the rotating electric machine as designed,
The positioning of the permanent magnet is a very important factor.

[0007]

(1) In FIG.
When the permanent magnet 3 is bonded and positioned and fixed to the rotor yoke 2, the permanent magnet 3 is broken or chipped by the attractive force of the permanent magnet 3, and the plating of the permanent magnet 3 is peeled off, and the characteristics of the permanent magnet 3 are reduced. There is a risk of damage. (2) In FIG. 10, when the permanent magnet 22 is fixed to the rotor 21 with bolts, the permanent magnet 22 may be broken or chipped. (3) When the permanent magnet is divided into a plurality in the axial direction,
When the magnetic poles are formed, workability is remarkably deteriorated due to the repulsive force or attractive force between the permanent magnets. This tendency becomes more remarkable as the size of the permanent magnet increases. (4) If a hole is provided in the permanent magnet itself, the magnetic flux is reduced by the amount of the hole, which hinders miniaturization and high output of the device. (5) When the size of the rotor is increased, the size of equipment for thermally curing an adhesive for bonding the permanent magnet and the rotor yoke is increased, and productivity is deteriorated. (6) In FIG. 9, in the case of a rotor structure in which the permanent magnet 3 is bonded and fixed to the rotor yoke 2, the entire rotor must be heated in order to eliminate the adhesive force when replacing the magnetic poles. Maintenance is difficult.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems and to provide a rotor of a rotating electric machine which is easy to manufacture.

[0009]

The invention of claim 1 is characterized in that a rotor magnetic pole is constituted by an integral permanent magnet and a base plate in which the permanent magnet is housed.

A second aspect of the present invention is characterized in that a rotor magnetic pole is composed of a plurality of divided permanent magnets and a base plate on which the plurality of permanent magnets are stored.

According to a third aspect of the present invention, in the rotary electric machine of the second aspect, the divided permanent magnets are bonded to each other.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the rotor of the rotary electric machine according to any one of the above, the permanent magnet is bonded to the base plate.

[0013] The invention of claim 5 is the invention of claims 1 to 4.
In the rotor of the rotary electric machine according to any one of the above, the base plate is a rigid body.

The invention of claim 6 is the first to fifth aspects of the present invention.
In the rotor of the rotary electric machine according to any one of the above, the base plate is a magnetic material.

The invention of claim 7 is claim 1 to claim 6
Wherein the rotor magnetic pole is magnetized after the permanent magnet is bonded to the base plate.

The invention according to claim 8 is the invention according to claims 3 to 7.
Wherein the bonding is performed by thermosetting of the adhesive.

According to a ninth aspect of the present invention, there is provided an image processing apparatus comprising:
Wherein the rotating magnetic pole is detachably fixed to the rotor via a base plate.

According to a tenth aspect of the present invention, in the rotating electric machine rotor according to any one of the first to ninth aspects, the rotating magnetic pole is attached from an inner diameter side of the rotor mounted on the stator. Features.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Embodiment 1 will be described with reference to FIGS. Rotor 33 shown in the first embodiment forms a rotating electric machine in cooperation with stator 31 having winding 40 housed in a slot. In FIG. 1, a yoke 34 of a rotor 33 is mounted on a rotating shaft 39 with a radial spider. As shown in FIG. 2, on the outer peripheral surface side of the rotor yoke 34, magnetic pole positioning grooves 35 running in the direction of the rotating shaft 39 are formed in the circumferential direction in accordance with the number of magnetic poles.

On the other hand, as shown in FIGS. 3 and 4, the rotor magnetic pole 42 has a back plate to which a thermosetting adhesive is added in a state where the permanent magnet 36 before magnetization is divided into a plurality. The base plate 37 is formed of a rigid and integral magnetic material such as iron, which is called a base plate 37 of a rigid body. Further, the permanent magnet 36 before magnetization and the base plate 3
The magnetic pole 42 constituted by 7 is placed in a heating furnace, the adhesive is thermally cured, and the permanent magnet 36 is bonded and fixed to the base plate 37.
In this case, the divided permanent magnets are preferably formed so as to be bonded to each other with the adhesive. Thereafter, the permanent magnet 36 is magnetized by a magnetizing device (not shown). The base plate 37 to which the magnetized permanent magnet 36 is fixed, that is, the rotor magnetic pole 4
2 is from inside the rotor 33 after the rotor 33 before mounting the rotor magnetic pole 42 is mounted on the stator 31. Specifically, the rotor 33 is completed by being removably fixed to the magnetic pole positioning groove 35 from the inner diameter side of the rotor yoke 34 with an appropriate fastening member, for example, a bolt. Reference numeral 52 shown in FIGS. 2 and 4 is a hole for a bolt as a fastening member.

According to the first embodiment, the permanent magnet 36
Without being influenced by the size of the magnetic pole 42 composed of
When the magnetic pole 42 of the rotor 33 is formed, cracks in the permanent magnet 36
Chipping can be prevented, and the magnetic pole 42 can be formed on the rotor yoke 34 more easily than in the conventional case. In addition, even if the permanent magnet 36 is broken or chipped when the rotor 33 is assembled and a defect occurs in the portion of the magnetic pole 42, the magnetic pole 42 can be easily attached and detached by removing the bolt. Can be exchanged quickly,
It is also advantageous for maintenance.

Further, since the permanent magnet 36 before magnetization in an easily handled state can be accurately positioned and adhered to the precisely machined base plate 37, it can be fitted into the groove 35 of the accurately machined rotor yoke 34. And a rotating electric machine as designed can be manufactured. The thermal processing of the adhesive is performed using a permanent magnet 3.
6 and the base plate 37, it is sufficient to heat the magnetic pole 42. Therefore, compared with a conventional rotating electric machine in which the permanent magnet 36 is directly adhered to the rotor 33, the heating required for thermosetting the adhesive is required. Since a small furnace can be used as the furnace, energy efficiency is increased.

Further, the conventional permanent magnet type rotating electric machine is operated mainly with a converter represented by a PWM inverter, and an eddy current flows through the conventional permanent magnet due to harmonics contained in the power supply voltage. There is a disadvantage that the magnet generates heat and the characteristics of the magnet are often lost. However, the magnetic pole 42 according to the first embodiment is constituted by a plurality of divided permanent magnets, so that the eddy current loss is reduced. be able to. In this case, the plurality of permanent magnets 36 are directly connected to the yoke 3.
4, the permanent magnet 36 divided into plural parts is integrally fixed to the base plate 37 as shown in the first embodiment, and the magnetic pole 42 thus integrated through the base plate 37. The operation of attaching to the yoke 34 is extremely efficient and easy. In the first embodiment, the unmagnetized permanent magnet 36 is attached to the base plate 37 in a state of being divided into a plurality of pieces. The magnetic pole can also be formed by attaching the same in a similar manner. In this case, there is an advantage that the fragile permanent magnet can be attached via the base plate 37 without being directly shaken.

Embodiment 2 FIG. Embodiment 2 will be described with reference to FIGS. The rotor according to the second embodiment has a structure in which the mounting direction of the magnetic pole 42 of the rotor 33 in the above-described embodiment can be performed from the inner diameter side of the rotor 33, and is particularly suitable for a large-diameter permanent magnet type rotating electric machine. It is suitable. In FIG. 5, the rotor yoke 82 has a plurality of magnetic pole insertion holes 83 (see FIG. 7) machined according to the number of magnetic poles, and a plurality of magnetic pole fixing bolt holes 69 extending in the circumferential direction from the inner diameter side. .

On the other hand, as shown in FIG. 6, the permanent magnet 72 divided into a plurality of magnets before magnetizing is made of a rigid magnetic material such as iron called a back plate to which a thermosetting adhesive is added. It is housed in and attached to the base plate 73 molded with. Reference numeral 74 in the figure is a screw hole provided in the base plate 73. Further, the permanent magnet 72 and the base plate 73 before magnetization are provided.
Is placed in a heating furnace (not shown), and the adhesive is thermoset to bond and fix the permanent magnet 72 to the base plate 73. Thereafter, the permanent magnet 72 is magnetized by a magnetizing device (not shown).

In FIG. 8, the base plate 73 to which the magnetized permanent magnets 72 are fixed is inserted from the inner diameter side of the rotor yoke 82 and bolted from the inner diameter side to complete the rotor 33.

According to the second embodiment, in manufacturing a conventional rotor, especially in a large-diameter permanent magnet type rotating electric machine, when incorporating the rotor 33 into the stator, several tens of
The assembling work is very difficult due to the application of a ton of suction force, and it is also difficult to pull out the rotor 33 when the rotor 33 is defective, but this assembling and removing work is difficult. It is easier and more efficient. In other words, in assembling, first, the magnetic pole 71 that does not act on the attracting force incorporates the unmounted rotor 33 into the stator.
1 can be mounted on the rotor 33 from the inner diameter side of the rotor yoke 82 through the magnetic pole mounting holes 83. As described above, according to the first embodiment, the magnetic pole 71 can be freely attached and detached as compared with the related art, so that the assembly and maintenance of the rotating electric machine including the permanent magnet 72 is facilitated.

[0028]

According to the first to tenth aspects of the present invention, it is possible to provide a rotor of a rotating electric machine that is easy to assemble and remove a magnetic pole from a rotor and to manufacture.

According to the first aspect of the present invention, since the fragile permanent magnet is previously attached to the base plate to form the magnetic pole, it can be easily attached to the rotor via the base plate.

According to the second aspect of the present invention, since the plurality of divided permanent magnets are previously mounted on the base plate to form the magnetic poles,
Even if the size of the magnetic pole is large, the work of attaching to the rotor becomes easy.

According to the third and eighth aspects of the present invention, since the plurality of divided permanent magnets are bonded to each other,
Eddy currents can be reduced.

According to the fourth and eighth aspects of the present invention, the permanent magnet is fixed to the base plate in units of magnetic poles, for example, using a method of thermosetting the adhesive. A heating furnace can be used.

According to the fifth aspect of the present invention, since a rigid body is used for the base plate, a large force can be applied as compared with a case where the permanent magnet is directly attached to the rotor yoke, and the operation can be efficiently performed. I can do it.

According to the seventh aspect of the present invention, since the permanent magnets before magnetization are mounted on the base plate, no attractive force or repulsive force acts between the permanent magnets or between the permanent magnets and the base plate. The magnetic pole can be mounted at an accurate position, and the mounting work becomes easy. Also, the mounting damage of the relatively fragile permanent magnet can be greatly reduced.

According to the eighth aspect of the present invention, since a method called adhesive thermosetting is used, a heating furnace which is smaller than the conventional one can be used.

According to the ninth aspect of the present invention, since the rotor magnetic pole is detachably fixed to the rotor via the base plate, assembly and removal can be performed quickly, and manufacture and maintenance are facilitated. .

According to the tenth aspect of the present invention, since the magnetic pole is configured to be detachable from the inner diameter side of the rotor, the work of assembling and removing the magnetic pole can be performed quickly when a problem occurs in the magnetic pole. , Can be easily replaced.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rotating electric machine according to a first embodiment.

FIG. 2 is a partial perspective view of a rotor yoke according to the first embodiment.

FIG. 3 is a perspective view of a magnetic pole according to the first embodiment.

FIG. 4 is a sectional view of a magnetic pole according to the first embodiment.

FIG. 5 is a partial sectional view of a rotating electric machine according to a second embodiment.

FIG. 6 is a perspective view of a magnetic pole according to the second embodiment.

FIG. 7 is a partial perspective view of a rotor yoke according to a second embodiment.

FIG. 8 is a diagram showing a manufacturing process of the rotor according to the second embodiment.

FIG. 9 is a partial cross-sectional view of a conventional rotating electric machine.

FIG. 10 is a perspective view of a conventional rotor.

[Explanation of symbols]

31 stator, 33 rotor, 34 rotor yoke, 3
5 Magnetic pole positioning groove, 36 permanent magnet, 37 base plate,
42 rotor magnetic pole, 52 bolt hole, 71 magnetic pole, 72
Permanent magnet, 73 base plate, 82 rotor yoke, 83
Magnetic pole insertion hole.

Claims (10)

[Claims] 1. A rotor for a rotating electric machine, wherein a rotor magnetic pole is constituted by an integral permanent magnet and a base plate on which the permanent magnet is housed. 2. A rotor for a rotating electric machine, wherein a rotor magnetic pole is constituted by a plurality of divided permanent magnets and a base plate in which the plurality of permanent magnets are housed. 3. The rotor of a rotating electric machine according to claim 2, wherein the divided permanent magnets are adhered to each other. 4. The rotor for a rotating electric machine according to claim 1, wherein the permanent magnet is adhered to the base plate. 5. The rotor for a rotating electric machine according to claim 1, wherein the base plate is a rigid body. 6. The rotor for a rotating electric machine according to claim 1, wherein the base plate is made of a magnetic material. 7. The rotor for a rotary electric machine according to claim 1, wherein the rotor magnetic pole is magnetized after the permanent magnet is bonded to the base plate. 8. The rotor for a rotating electric machine according to claim 3, wherein the bonding is performed by thermosetting of the adhesive. 9. The rotating magnetic pole is detachably fixed to a rotor via a base plate.
The rotor of the rotary electric machine according to any one of the above. 10. The rotor for a rotating electric machine according to claim 1, wherein the rotating magnetic pole is mounted from an inner diameter side of the rotor mounted on the stator.