JPH089599A - Permanent magnet type rotor - Google Patents

Abstract

PURPOSE:To make a permanent magnet type rotor firm and compact by disposing fan-shaped cores consisting of a plurality of magnetic bodies and permanent magnets alternately in circumferential direction, and integrally providing connection parts which extend in diametrical direction from the periphery of a circular part consisting a magnetic body positioned inside the fan-shaped cores and are narrower than the inside width of the fan-shaped cores. CONSTITUTION:Eight fan-shaped cores 1 consisting of magnetic bodies are arranged apart in circumferential direction. A circular part consisting of a magnetic body is made inside the fan-shaped cores 1, and the circular part 11 and the fan-shaped core 1 are coupled integrally with each other by connections, and the width is made narrower than the inside width of the fan-shaped core 1. Permanent magnets 2 are set in the grooves between eight fan-shaped cores 1 and the circular part 11, and those are fixed, being bonded to the plane parts provided at the periphery of the circular part 11. Moreover, vacant spaces 14 are provided between both sides of the connection 12 and the corners of the permanent magnet 2. A shaft 3 is set and fixed at the center of the circular part 11. The magnetic resistance of the connection 12 is large, and a great part of the magnetic fluxes of the permanent magnet 2 flow in radially outward direction. Hereby, a firm and compact product can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor in which a permanent magnet is used to form a field pole of a rotary electric machine.

[0002]

2. Description of the Related Art Conventionally, a permanent magnet type rotor is, for example, a first type rotor.
As a conventional example, there is disclosed a structure in which a plurality of fan-shaped cores and permanent magnets are alternately bonded in the circumferential direction, and further, connecting pins are passed through the fan-shaped cores and fixed to a shaft via an end plate (for example, Japanese Patent Laid-Open No. Hei 10 (1999) -242242). 1-144337). Further, as a second conventional example, the inner diameter sides of several pole-shaped fan cores are connected to an annular portion with a gap and are integrated, and a permanent magnet is inserted between the fan-shaped cores and adhered to each other. A device that is fixed to a shaft is disclosed (for example, Japanese Patent Laid-Open No. 1-144337).
As a third conventional example, among the several pole-shaped fan cores, only one magnetic pole constitutes the same pole, only the inner diameter side is connected to the annular portion, and the outer diameter side of the fan-shaped core is connected by a small cross-sectional area. What is connected is disclosed (for example, the actual Kaihei 4-12
8056).

[0003]

However, in the first prior art, since the fan-shaped core is divided into several poles, the number of parts and the number of assembling steps increase. The second conventional technique has a problem that leakage flux from the inner diameter side of the fan-shaped core to the shaft side via the annular portion increases. In the third conventional technique, since the inner diameter side of the fan-shaped core is separated from the annular portion, the adhesive force between the permanent magnet and the fan-shaped core is adjacent to the centrifugal force of the fan-shaped core and the permanent magnet when rotating at high speed. The fan-shaped core is held only by the bending strength of the connecting portion with a small cross-sectional area that is connected on the outer diameter side. Therefore, it is difficult to have sufficient strength against the centrifugal force of the fan-shaped core and the permanent magnet. The present invention has a small number of parts,
Moreover, it is an object of the present invention to provide a strong and compact permanent magnet type rotor with less leakage flux to the shaft.

[0004]

In order to solve the above problems, the present invention provides a permanent magnet rotor in which a fan-shaped core made of a plurality of magnetic bodies and a plurality of permanent magnets are alternately arranged in the circumferential direction. In, the annular portion made of a magnetic material provided on the inner diameter side of the fan-shaped core, and having a width narrower than the width of the inner diameter side of the fan-shaped core extending in the outer radial direction from the outer periphery of the annular portion, and the annular portion. And a connecting portion made of a magnetic material that integrally joins the fan-shaped core. In particular, a space is provided between the joint and the corner of the permanent magnet, and the annular portion, the fan-shaped core, and the joint are integrally formed. Further, an annular portion made of a non-magnetic material provided on the inner diameter side of the fan-shaped core, a dovetail-shaped fixing groove provided on the inner diameter side of each fan-shaped core, and protruding to the outer periphery of the annular portion, and in the fixing groove. A plurality of dovetail-shaped connecting portions to be fitted are provided.

[0005]

By the above means, since the cross-sectional area of the connecting portion is extremely smaller than that of the fan-shaped core, the magnetic resistance of the magnetic flux passing from the permanent magnet through the connecting portion to the annular portion is extremely large, and the magnetic flux of the permanent magnet Most of them flow in the outer diameter direction of the fan-shaped core, and the leakage flux to the shaft side can be greatly reduced through the annular portion. In addition, the number of parts can be reduced by forming a laminated steel sheet as an integral iron core in which the fan-shaped core and the annular portion are connected by the connecting portion. Further, since each fan-shaped core is connected to the annular portion by the connecting portion extending in the radial direction, bending stress due to the centrifugal force of the fan-shaped core and the permanent magnet does not occur in the connecting portion. Therefore, even if the cross-sectional area is small, the connecting portion can sufficiently withstand the centrifugal force of the fan-shaped core and the permanent magnet. Further, when the annular portion is made of a non-magnetic material and the convex portion is provided on the outer periphery and is fitted into the fixing groove of the fan-shaped core to fix the fan-shaped core and the annular portion, the diameter of the shaft can be increased. It is possible to increase the rigidity and to form a coupling portion having a size that can sufficiently withstand the centrifugal force of the fan-shaped core and the permanent magnet during high-speed rotation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a first embodiment of the present invention. In the figure, 1 is a fan-shaped core made of a magnetic material, 11 is an annular portion provided inside eight fan-shaped cores 1 arranged at intervals in the circumferential direction, and 12 is a combination of the annular portion 11 and the fan-shaped core 1. The width of the connecting portion is narrower than the width of the fan-shaped core 1 on the inner diameter side. 2 is a permanent magnet, 8 fan-shaped cores 1
The permanent magnet 2 is inserted into a groove 13 formed between the ring portion 11 and the annular portion 11, and the permanent magnet 2 is fixed to the bottom surface of the groove portion 13 provided in a flat shape on the outer periphery of the annular portion 11 by adhesion. Connecting part 1
A space portion 14 is provided between both side surfaces of 2 and a corner portion of the permanent magnet 2 as shown in an enlarged view in FIG. Reference numeral 3 is a shaft fitted and fixed inside the annular portion 11. With such a configuration, the cross-sectional area of the connecting portion 12 is extremely smaller than the cross-sectional area of the fan-shaped core 1. Therefore, the magnetic resistance of the magnetic flux passing from the permanent magnet 2 through the connecting portion 12 to the annular portion 11 is extremely large, and the permanent magnet is Most of the magnetic flux of the magnet 2 flows in the radial direction of the fan-shaped core 1. Therefore, it is possible to greatly reduce the leakage magnetic flux to the shaft side through the annular portion 11, and by forming the fan-shaped core and the annular portion by the laminated steel sheets as an integral iron core connected by the connecting portion, the number of parts can be reduced. Can be reduced. Further, since each fan-shaped core is connected to the annular portion by the connecting portion extending in the radial direction, bending stress due to the centrifugal force of the fan-shaped core and the permanent magnet does not occur in the connecting portion. Therefore, even the connecting portion having a small cross-sectional area can sufficiently withstand the centrifugal force of the fan core and the permanent magnet during high-speed rotation.

FIG. 3 is a front view showing a second embodiment.
Reference numeral 1'denotes independently formed fan-shaped cores, and eight fan-shaped cores are arranged in an annular shape at equal intervals. Reference numeral 15 denotes a dovetail-shaped fixing groove provided on the inner diameter side of the fan-shaped core 1'and extending in the radial direction. Reference numeral 4 is an annular portion made of a non-magnetic material, which is formed by pressing and stacking austenitic stainless steel plates, and the shaft 3 is fitted and fixed inside. Provided on the outer periphery of the annular portion 4 at equal intervals by the number of the fan-shaped cores 1'and in a dovetail-shaped convex connecting portion 41 extending in the outer diameter direction and fitted in the fixing groove 15 provided in the fan-shaped core 1 '. Yes, the connecting portion between the annular portion 4 and the fan-shaped core 1'is formed. A groove portion 13 is formed on the outer peripheral side of the annular portion 4 between the adjacent fan-shaped cores 1 ′, and the permanent magnet 2 is inserted and fixed. In this way, since the annular portion made of a non-magnetic material is provided inside the permanent magnet 2, all the magnetic flux of the permanent magnet 2 flows toward the outer periphery through the fan-shaped core 1 ', and the shaft provided inside the annular portion No magnetic flux will flow through. Further, since the dovetail-shaped connecting portion 41 is extended from the outer diameter of the annular portion 4 in the outer diameter direction and further fitted into the fixing groove 15, the fan-shaped core 1 ′ and the annular portion 4 are joined, so that the shaft is The diameter can be increased and the rigidity can be increased without being affected by the connecting portion. In addition, it is possible to form a coupling portion having a size sufficient to withstand the centrifugal force of the fan-shaped core and the permanent magnet during high-speed rotation. Although the above embodiment has been described with respect to the case of 8 poles, it may be other than 8 poles such as 4 poles and 6 poles. Further, instead of forming the annular portion by the austenitic stainless steel laminated plate in the above-mentioned embodiment, an aluminum drawing material may be used.

[0008]

As described above, according to the present invention, since the fan-shaped core and the annular portion are connected by the connecting portion extending in the outer diameter direction, the rigidity is high and the centrifugal force at the time of high speed rotation is sufficient. There is an effect that it is possible to provide a permanent magnet type rotor that withstands and has little leakage magnetic flux.

[Brief description of drawings]

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

FIG. 2 is an enlarged front view of a main part of the embodiment of the present invention.

FIG. 3 is a front view showing a second embodiment of the present invention.

[Explanation of symbols]

1, 1'fan-shaped core, 11 annular parts, 12 connecting parts,
13 groove parts, 14 space parts, 15 fixing grooves, 3 shafts, 4 annular parts, 41 connecting parts

Claims (3)

[Claims] 1. A permanent magnet rotor in which a fan-shaped core made of a plurality of magnetic bodies and a plurality of permanent magnets are alternately arranged in a circumferential direction, the magnetic body being provided on the inner diameter side of the fan-shaped core. A connecting portion formed of an annular portion and a magnetic body extending from the outer periphery of the annular portion in the outer diameter direction and having a width narrower than the width on the inner diameter side of the fan-shaped core, and integrally coupling the annular portion and the fan-shaped core. And a permanent magnet rotor. 2. The permanent magnet type rotation according to claim 1, wherein a space portion is provided between the connecting portion and a corner portion of the permanent magnet, and the annular portion, the fan-shaped core and the connecting portion are integrally formed. Child. 3. A permanent magnet rotor in which a fan-shaped core made of a plurality of magnetic bodies and a plurality of permanent magnets are alternately arranged in a circumferential direction, wherein a non-magnetic body provided on the inner diameter side of the fan-shaped core is used. An annular portion, a dovetail-shaped fixing groove extending in the radial direction provided on the inner diameter side of each fan-shaped core, and a plurality of dovetail-shaped protrusions radially protruding from the outer periphery of the annular portion and fitted into the fixing groove. A permanent magnet type rotor characterized by having a connecting portion.