JPH0562160U - Permanent magnet rotor of electric motor - Google Patents

Abstract

(57) [Abstract] [Purpose] It is possible to provide a permanent magnet rotor for an electric motor, which can improve the fixing force of a resin magnet provided on the outer periphery of a rotor main body, and can reduce man-hours and material costs. [Structure] A resin magnet 4 integrally formed in the outer peripheral ring shape of a rotor body 3 made of a laminated iron core having a plurality of small recesses 2 formed in the outer peripheral surface in the axial direction, and a shaft 5 inserted into the rotor body 3. And a small recess of the rotor body 3 is filled with a part of the resin magnet 4.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rotor of an industrial electric motor used as a rotary drive source for machine tools, industrial robots, and the like. In particular, it is a permanent magnet rotation formed by integrally molding a resin magnet on the outer circumference of the rotor body. Regarding the child.

[0002]

[Prior Art]

 In recent years, electric motors using a permanent magnet rotor formed by integrally molding a resin magnet on the outer circumference of the rotor body have become mainstream.

A permanent magnet rotor of this type of electric motor will be described below with reference to FIGS. 3 and 4. As shown in the figure, the permanent magnet rotor 11 is formed by integrally molding a resin magnet 12 on the outer periphery in a ring shape, and inserting a shaft 14 into a rotor body 13 which is heat-cured.

A small concave groove 15 is spirally formed on the outer periphery of the rotor body 13 for molding and fixing the resin magnet 12, and powder particles of the resin magnet 12 are integrally formed during the integral molding. The resin magnet 12 is also filled in 15 and is heat-cured to strengthen the fixing force of the resin magnet 12 to the rotor body 13 and to obtain the rotation-stop hardening.

[0005]

[Problems to be solved by the device]

 In such a conventional permanent magnet rotor of an electric motor, the spiral small groove 15 provided on the outer periphery of the rotor body 13 is formed by cutting, which results in high cost.

That is, when the rotor body 13 itself is formed by cutting and the rotor body 13 is elongated in the axial direction due to the difference in output of the electric motor, the spiral small concave groove 15 is machined. Not only is it difficult, but it also takes a lot of man-hours to secure the accuracy of the insertion portion of the shaft 14, which causes a problem of extremely high cost.

The present invention solves the above problems, and an object thereof is to provide an inexpensive permanent magnet rotor for an electric motor by a simple method.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a permanent magnet rotor of an electric motor according to the present invention comprises a rotor body composed of a laminated iron core in which a plurality of small recesses are formed in the axial direction of the outer peripheral surface, and a ring-shaped outer periphery of the rotor body. And a shaft to be inserted into the rotor body, and a small concave portion of the rotor body is filled with a part of the resin magnet.

[0009]

[Action]

 With the above-described structure, the present invention laminates the laminated core pieces by pressing, which is a well-known method, by the mutual crimping action of the raised protrusions, and at the same time when obtaining the rotor body of the desired laminated core, the small recesses are simultaneously formed. Since it can be done by punching, a small recess is provided on the outer circumference of the rotor body very easily, and the small recess is filled with a part of the resin magnet provided on the outer circumference of the rotor body, so that the resin magnet rotates firmly. It will be held by the child body.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. As shown in the figure, a plurality of cut-out projections 1 and a plurality of semicircular small recesses 2 are formed on the core piece by press working, and the core-pieces are laminated by the mutual caulking action of the cut-out projections 1. Then, the rotor main body 3 is formed, and the resin magnet 4 is integrally formed on the outer circumference of the rotor main body 3 in a ring shape, and a part of the resin magnet 4 is filled in the semicircular small concave portion 2. Is inserted to form the permanent magnet rotor 6.

According to the above configuration, even if the size of the electric motor is different and the length of the rotor body 3 is long, the small recesses 2 are freely formed by utilizing the mutual caulking actions of the cut-out projections 1. can do.

As described above, according to the embodiment of the present invention, the resin magnet 4 is firmly fixed to the rotor body 3 by the small concave portion 2 provided in the rotor body 3 to improve the fixing force and prevent the idling. In addition, the small recesses 2 formed on the outer circumference of the rotor body 3 can be easily formed by pressing. Further, it can be punched and formed in the same die as the stator laminated core piece (not shown) of the electric motor.

[0013]

[Effect of the device]

 As is clear from the above embodiments, according to the present invention, a plurality of small recesses are formed in the axial direction of the outer peripheral surface of the rotor main body, and a ring-shaped resin magnet is integrally formed on the outer peripheral surface of the rotor main body. Since the small recesses are partially filled, the fixing force of the resin magnet is improved, and the small recesses can be formed at the time of punching the laminated core pieces, and are the same as the laminated core pieces of the stator. It is possible to provide a permanent magnet rotor for an electric motor, which reduces the waste of material obtained from the material and reduces the man-hours and material cost by an extremely simple method.

[Brief description of drawings]

FIG. 1 is a perspective view of a permanent magnet rotor of an electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view of a rotor body of the permanent magnet rotor.

FIG. 3 is a perspective view of a permanent magnet rotor of a conventional electric motor.

FIG. 4 is a perspective view of a rotor body of the permanent magnet rotor.

[Explanation of symbols]

 2 Small recess 3 Rotor body 4 Resin magnet 5 Axis

Claims (1)

[Scope of utility model registration request] 1. A rotor body composed of a laminated iron core in which a plurality of small recesses are formed on the outer peripheral surface in the axial direction, a resin magnet integrally formed in a ring shape on the outer periphery of the rotor body, and the rotor body. A permanent magnet rotor for an electric motor, comprising: a shaft to be inserted; and a small recess of the rotor main body filled with a part of the resin magnet.