JPH08331782A - Rotor for permanent magnet rotary electric machine - Google Patents

Abstract

PURPOSE: To provide the rotor for a permanent magnet rotary electric machine capable of improving the assembling operability. CONSTITUTION: Permanent magnets 22a to 22f are fixed to cores 21a to 21c are unitized as core blocks I to III, and the number of the blocks I to III inserted to a rotary shaft 23 can be regulated in response to the capacity.

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.

[0002]

2. Description of the Related Art Some permanent magnet rotating electric machines, which are widely used in various applications as servo motors and synchronous motors, have a permanent magnet as a field magnet provided on the rotor side.

In this type of permanent magnet rotating electric machine, it is necessary to fix the permanent magnet to the rotor core, and various fixing structures have been proposed conventionally. 3 to 5 show a permanent magnet fixing structure in a permanent magnet rotating electric machine according to the related art.
Shown in

In the rotor shown in FIG. 3, the iron core 1 has four
Four equally divided blocks are formed, and rectangular parallelepiped permanent magnets 2a, 2b, 2c, 2 are formed between adjacent blocks in the circumferential direction.
These permanent magnets 2a to 2d are fixed by sandwiching d. In the rotor shown in FIG. 4, the permanent magnets 5a, 5b, 5 are provided at positions where the outer peripheral surface of the cylindrical iron core 4 is equally divided.
C and 5d are fixed. In the rotor shown in FIG. 5, permanent magnets 8a, 8b, 8c and 8d are fitted and fixed in grooves formed at positions where the outer peripheral surface of the cylindrical iron core 7 is divided into equal parts. In FIGS. 3 to 5, reference numerals 3, 6 and 9 are rotating shafts.

[0005]

Among the fixing structures as described above, in the case shown in FIG. 4, an adhesive is used for the permanent magnet 5a.
~ 5d is attached to the iron core 4. Therefore, when this fixed structure is adopted, the structural problem becomes remarkable as the rotating electric machine becomes larger, though not so much, when it is small. That is, as the size increases, permanent magnets 11c and 11d are required in addition to the permanent magnets 11a and 11b fixed to the iron core 10 that rotates integrally with the rotating shaft 12, as shown in FIG. The number of magnets 11a to 11d increases, and it takes a lot of time to apply an adhesive for sticking the permanent magnets 11a to 11d, to position the permanent magnets 11a to 11d, and to perform heat treatment (heat curing of the adhesive). However, there is a drawback in that workability is deteriorated and automation is hindered.

The present invention has been made in view of the above prior art, and an object of the present invention is to provide a rotor of a permanent magnet rotating electric machine capable of improving assembly workability.

[0007]

The structure of the present invention for achieving the above-mentioned object is a rotor of a permanent magnet rotating electric machine in which a permanent magnet is arranged on the outer peripheral surface of a cylindrical rotor core to form a field. In the above, there is provided an iron core block including a core having a step portion with which one end surface of the permanent magnet comes into contact, and configured to regulate the axial position of the permanent magnet by the step portion, and the permanent magnet fixed to the iron core. It is characterized in that a plurality of them are arranged in the axial direction and are attached to the rotary shaft.

In the above rotor, even when each iron core block is configured to be skewed by a predetermined angle with respect to the rotary shaft when mounted on the rotary shaft, each core block is further skewed with respect to the rotary shaft and mounted along the key. The iron core block may be attached to the rotary shaft.

[0009]

According to the present invention having the above-mentioned structure, when the permanent magnet is positioned with respect to the iron core in the assembling work of the rotor, this step is carried out by utilizing the stepped portion of the iron core, and thus, After integrating with the magnet, a required number of iron core blocks are inserted and fixed along the axial direction of the rotating shaft.

[0010]

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

FIG. 1 is a vertical sectional view showing an embodiment of the present invention, and FIG. 2 is a right side view thereof. As shown in both figures, the iron core 21
a, 21b, 21c are made by stacking silicon steel sheets, and the permanent magnets 22a, 22b, 22c, 2 are provided on the left side of each figure.
It has a step portion for positioning 2d, 22e, 22f in the axial direction. Further, as apparent from FIG. 2, the permanent magnets 22e, 22 are arranged in the circumferential direction of the iron core 21c.
It has steps for positioning f, 22g and 22h in the circumferential direction (only the iron core 22c is shown in the figure, but the iron cores 22a and 22b have the same structure).

Each of the permanent magnets 22a to 22h has an iron core 21 at one end face in the axial direction and both end faces in the circumferential direction.
The cores 21a to 21c are fixed to the cores 21a to 21c by abutting on the stepped portions of a to 21c in the axial direction and the circumferential direction. This fixing is performed by attaching the permanent magnets 22a to 22h to the iron core via an adhesive and then heating and curing the adhesive.

Thus, the iron cores 21a to 21c and the permanent magnet 2
Iron core blocks I, II, II in which 2a to 22h are integrated
Form I. Since each of the iron core blocks I, II, and III is an independent unit of field pole, a required number of iron core blocks I, II, and III are arranged in parallel along the rotary shaft 23 according to the capacity of the rotating electric machine.

The keyway 2 is formed on the rotary shaft 23 in this embodiment.
3a is provided skewed in the axial direction, and a key 24 is fitted in this key groove 23a. On the other hand, the iron core 21
Grooves to be fitted into the keys 24 are provided on the inner peripheral surfaces of a to 21c. Thus, by inserting the iron cores 21a to 21c into the rotary shaft 23, the iron cores 21a to 21c are skewed along the key 24 and fixed in this state. This fixing is performed via the clamps 25a and 25b that are in contact with the end faces of the iron cores 21a and 21c.

Skewing the iron cores 21a to 21c in this manner may be performed as necessary, but there is an advantage that the cogging torque can be reduced by skewing as described above. The specific structure for skewing is not limited to the above structure.

The iron cores 21a to 21c do not necessarily have to have a laminated structure. In principle, it may be a block. In this case, the characteristics are inferior, but there is an advantage that it is easy to manufacture, and therefore it may be determined in consideration of the both.

[0017]

As described above in detail with reference to the embodiments, according to the present invention, the field unit composed of the permanent magnet and the iron core is constituted as an iron core block to constitute one unit. According to the above, only by increasing or decreasing the number of iron core blocks and adjusting it, a rotary electric machine having a desired capacity can be obtained. Since the labor at this time only adds the labor at the time of assembling the iron core block to the labor at the time of forming the iron core block, the manufacturing can be easily performed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a rotor according to an embodiment of the present invention.

FIG. 2 is a right side view of FIG.

FIG. 3 is a front view showing a rotor according to a conventional technique.

FIG. 4 is a front view showing a conventional rotor.

FIG. 5 is a front view showing a rotor according to a conventional technique.

FIG. 6 is a perspective view showing a rotor according to a conventional technique.

[Explanation of symbols]

I, II, III iron core blocks 21a, 21b, 21c Iron cores 22a, 22b, 22c, 22d, 22e, 22f, 2
2g, 22h Permanent magnet 23 Rotating shaft 23a Keyway 24 Key

Claims (3)

[Claims] 1. A rotor of a permanent magnet rotating electric machine in which a permanent magnet is arranged on the outer peripheral surface of a cylindrical rotor core to form a field, and a step portion with which one end surface of the permanent magnet abuts, A plurality of iron core blocks composed of an iron core configured to regulate the axial position of the permanent magnet by the step portion and a permanent magnet fixed to the iron core are arranged in the axial direction and attached to the rotary shaft. Characteristic Permanent magnet rotating electric machine rotor. 2. The rotor of a permanent magnet rotating electric machine according to claim 1, wherein each iron core block is configured to be skewed by a predetermined angle with respect to the rotating shaft when attached to the rotating shaft. 3. The rotor of a permanent magnet rotating electric machine according to claim 2, wherein each iron core block is attached to the rotary shaft along a key that is skewly attached to the rotary shaft.