JP2001037121A - Permanent magnet type rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a permanent magnet type rotor, capable of simply forming a magnetic air gap between a permanent magnet and an annular portion and fixing a permanent magnet into a permanent magnet inserting space without fluctuations. SOLUTION: This permanent magnet type rotor comprises a plurality of rotor cores 4, each obtained by providing a plurality of sector-like cores 2 formed in a permanent magnet insertion space 8 between the respective cores 2, arranged in the circumferential direction, an annular portion 3 made of a magnetic material provided at the inner peripheral side of the core 2 and a slender coupling portion 6 extended radially to integrally connect a portion 3 to the core 2 on the outer periphery of the portion 3 are laminated to constitute a rotor laminated core 1. In this case, axially bendable protrusions 9 is provided on a plurality of positions of the outer periphery of the portion 3 of the axial direction of the core 1, and the magnet 10 is inserted fixedly by folding the protrusions 9 into a space 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor having a field pole of a rotating electric machine using permanent magnets.

[0002]

2. Description of the Related Art Conventionally, a plurality of fan-shaped cores are arranged in a circumferential direction by forming a permanent magnet insertion space between the respective cores, and a magnetic material is formed on the inner peripheral side of the fan-shaped core. In a permanent magnet type rotor having a rotor core provided with an annular portion and provided on the outer periphery of the annular portion, a narrow portion extending radially and integrally connecting the annular portion and the fan-shaped core is provided. When the permanent magnet is inserted into the permanent magnet insertion space, a non-contact is provided between the annular portion of the permanent magnet insertion space and the bottom of the permanent magnet so that the bottom of the permanent magnet does not contact the annular portion to leak magnetic flux. The outer periphery of the permanent magnet has been moved by inserting a magnetic spacer.

[0003]

However, in the prior art, in order to form a magnetic gap between the permanent magnet and the annular portion, the space between the annular portion and the bottom of the permanent magnet is inserted in all the permanent magnet insertion spaces. Since it is necessary to insert a non-magnetic spacer between them, not only the number of components increases, the cost increases, but also the operation is very troublesome. The present invention has been made to solve such a problem, and a magnetic gap can be easily formed between the permanent magnet and the annular portion, and the permanent magnet can be inserted into the permanent magnet insertion space without looseness. It is an object of the present invention to provide a permanent magnet type rotor that can be fixed to the rotor.

[0004]

In order to solve the above-mentioned problems, the present invention provides a plurality of fan-shaped cores which are arranged in a circumferential direction by forming a permanent magnet insertion space between the respective cores. On the inner peripheral side of the fan-shaped core, an annular portion made of a magnetic material is provided, and on the outer periphery of the annular portion, a thin connecting portion extending in the radial direction and integrally joining the annular portion and the fan-shaped core is provided. In the permanent magnet type rotor, a plurality of rotor cores are laminated to form a rotor laminated core.
An axially bendable protrusion is provided on the outer periphery of the annular portion at a plurality of positions in the axial direction of the rotor laminated core, and the permanent magnet is inserted and fixed in the permanent magnet insertion space by bending the protrusion. It was made.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of an upper half of a rotor core showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of the upper half taken along the line AA in FIG. 1, and FIG. FIG. 4 is a cross-sectional view of the upper half taken along line BB of FIG. 3 showing a state where the upper half is inserted and fixed. In the figure, a rotor laminated core 1 includes a plurality of fan-shaped cores 2 arranged at equal intervals,
A plurality of thin rotor cores 4 composed of the annular portion 3 are stacked using, for example, a V-shaped caulking projection 5. The fan-shaped core 2 and the annular portion 3 are both made of a magnetic material, and are connected to each other by a thin connecting portion 6 formed on the outer periphery of the annular portion 3 so as to extend in the radial direction. The fan-shaped core 2 has engaging portions 7 on the left and right sides of the outer peripheral portion. The fan-shaped core 2 and the annular portion 3 of the rotor core 4 having such a shape are manufactured by, for example, integrally punching a silicon steel plate with a press. Further, a permanent magnet insertion space 8 is formed between each fan-shaped core 2, and the rotor core 4 is configured such that the fan-shaped core 2 and the permanent magnet insertion space 8 are alternately arranged in the circumferential direction. Is done. The permanent magnet insertion space 8 is formed over the entire area of the rotor laminated core 1 in the axial direction, and the rotor laminated core 1 has protrusions 9 on the annular portions 3 of the rotor core 4 at a plurality of positions in the axial direction. Is provided. The protrusion 9 is formed on the outer periphery of the annular portion 3 facing the permanent magnet insertion space 8 so as to be axially bendable, and forms a magnetic gap between the bottom of the permanent magnet 10 and the annular portion 3. And serves to fix the permanent magnet 10 in the permanent magnet insertion space 8 without rattling. In addition,
The number of the rotor cores 4 forming the projections 9 is about 1 to 2 at each location in consideration of the easiness of bending (the figure shows the case of one rotor core). The rotor core 4 having the protrusions 9 is manufactured by a jumping cut method of a press. In such a configuration, the permanent magnet 10 is fixed to the rotor laminated core 1 by inserting the permanent magnet 10 into the permanent magnet insertion space 8 while advancing the permanent magnet 10 in the direction of the arrow and bending the protrusion 9 in the axial direction at the tip end surface. It is done by doing. The permanent magnet 10 is pushed up in the radial direction by bending the projection 9 and riding on the projection 9, and the upper end face is pressed and fixed to the engaging portion 7 of the fan-shaped core 2. As a result, a magnetic gap is formed between the bottom of the permanent magnet 10 and the annular portion 3 to prevent leakage of magnetic flux from the permanent magnet 10 to the annular portion 3 and to prevent the permanent magnet 6 from being inserted into the permanent magnet insertion space 8.
It is fixed without rattling inside. The rotor laminated core 1 configured as described above is fitted and fixed to, for example, a cylindrical portion of a cup-shaped rotor boss (not shown) or an outer peripheral surface of a rotating shaft.

[0006]

As described above, according to the present invention, the annular portions 3 are provided at a plurality of positions in the axial direction of the rotor laminated core 1.
Since the protrusion 9 that can be bent in the axial direction is provided on the outer periphery facing the permanent magnet insertion space 8, the permanent magnet 10 is inserted into the permanent magnet insertion space 8 when the permanent magnet 10 is inserted into the permanent magnet insertion space 8.
Can be fixed on the permanent magnet insertion space 8 by riding on the projection 9 while bending the projection 9.
A magnetic gap can be easily formed at a low cost between the bottom of the O and the annular portion 3. In addition, the permanent magnet 10
Can be fixed in the permanent magnet insertion space 8 without rattling.

[Brief description of the drawings]

FIG. 1 is a front view of an upper half of a rotor core showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the upper half taken along line AA of FIG.

FIG. 3 is a front view of an upper half showing a state in which a permanent magnet is inserted and fixed in a rotor core.

FIG. 4 is a cross-sectional view of the upper half along the line BB of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotor laminated core, 2 Fan-shaped core, 3 Annular part, 4 Rotor core, 5 Protrusion for caulking, 6 Connection part, 7 Engagement part, 8 Permanent magnet insertion space, 9 Protrusion, 10 Permanent magnet

Claims (1)

[Claims] 1. A plurality of fan-shaped cores are arranged in a circumferential direction by forming a permanent magnet insertion space between the respective cores, and an annular ring made of a magnetic material is provided on an inner peripheral side of the fan-shaped cores. A plurality of rotor cores provided on the outer periphery of the annular portion and provided with a thin connecting portion extending radially and integrally connecting the annular portion and the fan-shaped core. In the permanent magnet rotor constituting the laminated core, a plurality of axially bendable projections are provided on the outer periphery of a plurality of annular portions in the axial direction of the rotor laminated core, and the permanent magnet is provided by the permanent magnet. A permanent magnet type rotor, wherein the projection is bent and inserted and fixed in an insertion space.