JPS60197149A - Permanent magnetic field rotor - Google Patents

Abstract

PURPOSE:To inexpensively manufacture a permanent magnet field rotor by inserting a cushion material into a gap between one of both plates secured on a shaft and the end of a permanent magnet, thereby preventing metallic powder from entering the gap. CONSTITUTION:A permanent magnet field rotor has a plurality of permanent magnets 11 radially disposed from the axis of the rotor, and a laminated pole 12 made of electromagnetic steel plates 13 disposed between the magnets. End plates 14, 15 are provided at both ends of the magnets 11 and the poles 12, clamped by clamping members 16, and secured on a shaft 17. A gap is formed between the plates 14 and 15 by the manufacturing tolerance of the magnets 11 in the rotor. Thus, a cushioning material 18 is inserted to bury the gap. The material 18 desirably has heat resistance and large compressibility. Thus, it can prevent metallic chips such as cutting chips of the poles 12 from entering the gap.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a permanent magnet field type synchronous rotating electrical machine, and more particularly to a permanent magnet field rotor of a permanent magnet field type synchronous rotating electrical machine.

PRIOR ART AND PROBLEMS Conventionally, as shown in FIGS. 1 and 2, a lamination system consisting of a large number of electromagnetic steel sheets 3 laminated between a plurality of permanent magnets 1 arranged radially around the rotor axis has been used. The permanent magnet I and the two end plates 4 and 5 disposed at both ends of the magnetic pole body 2 are fastened by a fastening portion 6 that passes through the magnetic pole body 2, and both end plates 4 and 5 are connected to the shaft. A permanent magnet field rotor fixed on 7 is used. In this type of permanent magnet field rotor, each electromagnetic steel plate 3 of the magnetic pole body 2 is separated from each other as shown in FIG. 81 materials
After being layered and assembled as shown in Figure 1, the connecting portions of the electromagnetic steel sheet materials are removed by cutting and the second layer is assembled.
It is separated into the shapes shown in the figure.

In this type of permanent magnet field rotor, it is desirable that the lengths of the permanent magnets 1 and the magnetic pole bodies 2 are the same. in this case,
Since the magnetic pole body 2 has a laminated structure of electromagnetic steel sheets 3,
The length of the magnetic pole body 2 can be kept within a slight tolerance similar to the thickness of the electromagnetic steel sheet 2. However, since the permanent magnet 1 is generally formed by sintering or the like, manufacturing tolerances of several percent usually occur.

If the manufacturing tolerance of the permanent magnet 1 is on the positive side, both ends of the permanent magnet 1 in the longitudinal direction must be machined, but machining of permanent magnets is generally extremely difficult, so it is expensive to manufacture. It's going to be up. For this reason, conventionally, the manufacturing tolerance range of the permanent magnet l is generally set to the minus side of the reference dimension. As a result, due to the manufacturing tolerance of the permanent magnet 1, a gap within the manufacturing tolerance range of the permanent magnet 1 is created between the end plates 4, 5 and the permanent magnet 1, and both end plates 4° 5
It was no longer possible to fix the permanent magnet 1 in between. In addition, metal powder such as a cutting layer easily enters the gap between the permanent magnet l and the end plates 4 and 5, and the metal powder comes out from the gap while the rotor is rotating and damages the inner surface of the stator. This caused the performance of the electric motor to deteriorate.

Purpose of the Invention In view of the problems of the permanent magnet field rotor having the above configuration, the present invention aims to prevent the movement of the permanent magnet between the two end plates and the intrusion of metal powder etc. into the gap between the permanent magnet and the end plate. It is an object of the present invention to provide a permanent magnet field rotor that can prevent deterioration in the performance of an electric motor and can be manufactured at low cost.

According to the present invention, a laminated magnetic pole body made of a large number of electromagnetic steel sheets laminated between a plurality of permanent magnets arranged radially with respect to the rotor axis is arranged, and the permanent magnets and In a permanent magnet field rotor in which two end plates arranged at both ends of a magnetic pole body are fastened by a fastening member passing through the magnetic pole body, and both end plates are fixed on a shaft, at least one of the both end plates and the permanent magnet This is achieved by a permanent magnet field rotor characterized in that a cushioning material is inserted into the gap between the end of the permanent magnet and the end of the permanent magnet to fill the gap.

Examples of the invention Hereinafter, the present invention will be described in detail with reference to the drawings.

3 to 7 show an embodiment of the present invention. First, referring to FIGS. 3 to 5, the permanent magnet field rotor is equipped with a plurality of (four in this case) permanent magnets 11 arranged radially around the rotor axis.
A laminated magnetic pole body 12 made of a large number of laminated electromagnetic steel plates 13 is disposed between two adjacent permanent magnets 11 . End plates 14 and 15 are provided at both ends of the permanent magnet 11 and the magnetic pole body 12, respectively, and both end plates 14 and 15 are firmly fastened by a fastening member 16 that passes through the magnetic pole body I2. The end plates 14,15 are fixed on the shaft 17 by means of press-fit caps.

In this permanent magnet field rotor, each electromagnetic steel sheet 13 of the magnetic pole body 12 is separated from each other as shown in FIG. (See Fig. 7) are stacked and assembled as shown in Fig. 3, then the 13° connecting portion 13a' of the electromagnetic steel sheet material is removed by cutting and separated into the shape shown in Fig. 4. be done.

Since the magnetic pole body 12 has a laminated structure of electromagnetic steel sheets 13, the length of the magnetic pole body 12 can be kept to a slight tolerance similar to the thickness of the electromagnetic steel sheet 12.

Referring to FIG. 5, the length a of the magnetic pole body 12 can be kept within a tolerance range of +0.5 to -0 with respect to the reference length 701A-, for example. - Since the permanent magnet 11 is usually formed by sintering or the like, manufacturing tolerances of several percent occur. For this reason, the permanent magnet 11 is formed so as to fall within a tolerance range on the minus side, for example, from -0.2 to -2.2 with respect to the reference length 70. As a result, due to the manufacturing tolerance of the permanent magnet 11, a gap of 0.2 to 2.7 ml is created between the end plates 14, 15 and the permanent magnet 11.

Therefore, a cushion +4' 18 is inserted between at least one end plate, here the end plate 15, and each permanent magnet 11 to fill the gap.

It is preferable that the cushioning material 18 has heat resistance sufficient to withstand heat generation within the rotating electric machine. As such a material, dense H-thermal rubber inside can be used, but it is preferable that the cushioning material 18 is made of a material with a high compressibility so that it can accommodate gaps of various dimensions within the above-mentioned manufacturing tolerance range. Therefore, it is desirable to use a soft material with internal gaps, such as urethane rubber foam, glass wool, or nonwoven fabric. In the case of the cushion JtA'l8 made of these materials, the thickness C can be set to, for example, about 3 ms, as shown in Fig. 6, and it can be compressed and inserted into the gaps of each dimension. I can do it. However, in the case of cushion JrA IB made of these urethane rubber foam materials, glass wool, nonwoven fabric, etc.
It does not have enough strength to fix the permanent magnet 1, and there is a risk that metal powder such as cutting waste from the magnetic pole body 12 may enter the gap inside the cushion material 18. Therefore, when using the cushion material 18 made of these urethane rubber foam materials, glass wool, nonwoven fabric, etc., the cushion + A
It is desirable to solidify the cushioning material 18 by filling the gap inside the cushioning material 18 with a resin impregnation treatment after inserting the cushioning material 18 between the end plate 15 and the permanent magnet 1. With this configuration, the material 18 that completely fills the gap between the permanent magnet 11 and the end plate 15 can prevent the permanent magnet 11 from moving, and also prevent metal powder from entering into the cushioning material 18. It becomes possible. Resin impregnation is also performed on the fully laminated magnetic pole body 12. Therefore, the resin impregnation treatment for the cushion +A' 18 may be performed at the same time as the resin impregnation treatment for the magnetic pole body 12.

In the permanent magnet field rotor having the above configuration, the permanent magnet 1
There is no need to precisely machine both end faces in the longitudinal direction of the permanent magnet 11 after forming the permanent magnet 11. Therefore, it can be manufactured at low cost.

Although one embodiment has been described above, the present invention is not limited to the embodiment described above, and, for example, the fastening means can take various forms.

Effects of the Invention As is clear from the above description, the present invention has a laminated magnetic pole body made of a large number of laminated magnetic steel sheets between a plurality of permanent magnets arranged radially with respect to the rotor axis, In a permanent magnet field rotor in which two end plates disposed at both ends of a permanent magnet and a magnetic pole body are fastened together by a fastening member passing through the magnetic pole body, and both end plates are fixed on a shaft, at least one of said both end plates and Since the present invention is characterized in that a cushioning material is inserted into the gap between the end of the permanent magnet and the end of the permanent magnet to fill the gap, the movement of the permanent magnet between the two end plates and the relationship between the permanent magnet and the end plate are prevented. It is possible to prevent metal powder, etc. from entering into the gap between the parts, thereby preventing deterioration in the performance of the electric motor, and
It becomes possible to provide a permanent magnet field rotor that can be manufactured at low cost.

[Brief explanation of drawings]

Fig. 1 is a half-sectional front view of a conventional permanent magnet field rotor without showing its structure; Fig. 2 is a sectional view of the rotor shown in Fig. 1 taken along line u-n in Fig. 1; Figure 4 is a front view of a permanent magnet field rotor showing an embodiment of the present invention; Figure 4 is a sectional view of the rotor shown in Figure 3 taken along line IV-IV in Figure 3; FIG. 3 is a vertical cross-sectional view showing the rotor in the middle of manufacturing, FIG. The figure is a front view showing the electromagnetic steel plates of the rotor shown in FIG. 3. 11 - Permanent magnet, 12 - Magnetic pole body, 13 - Electromagnetic steel plate, 14. 15 One end plate, 16 - Fastening member, 17 - Shaft, 18 - Cushion material.

Claims (1)

[Claims] 1. A laminated magnetic pole body made of a large number of laminated electromagnetic steel plates is arranged between a plurality of permanent magnets arranged radially with respect to the rotor axis, and the permanent magnets and the magnetic pole body are provided with In a permanent magnet field rotor in which two disposed end plates are fastened by a fastening member passing through the magnetic pole body and both end plates are fixed on a shaft, at least one of the two end plates and an end of the permanent magnet are connected to each other. A permanent magnet field rotor, characterized in that a cushioning material is inserted into the gap between the two to fill the gap. 2. The cushioning material is made of a mouth material having a gap inside, and the gap inside the cushioning material inserted into the gap between the permanent magnet and the end plate is filled with a resin-impregnated hole. A permanent magnet field rotor according to claim 1, characterized in that: 3. The permanent magnet field rotor according to claim 2, wherein the cushioning material is made of any one of urethane rubber foam, glass wool, and nonwoven fabric.