JPH0670494A - Field for cylindrical motor - Google Patents

Abstract

PURPOSE:To simply obtain a low-cost multi-polar field by bending flat platelike magnetic elements and permanent magnets in an involute curve state, and then laminating it to form a cylindrical field. CONSTITUTION:Magnetic elements 11 and permanent magnets 12 of flat plate shape bent along an involute curve are alternately laminated on a surface of a shaft 2 to form a field 1. Here, since a distance between two curves of the involute curves with one circle as a reference becomes constant even at any position, the elements 11 and the magnets 12 to be formed in the curve state can be made a flat plate state. Accordingly, since the elements 11 can be formed of conventional silicon steel plates and the magnets 12 can be formed of sheetlike flexible rubber magnets, etc., the field 1 can be formed simply at a low cost.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OA for an industrial robot.
The present invention relates to a field of a cylindrical motor used for applications.

[0002]

2. Description of the Related Art Conventionally, a field used in a cylindrical motor or the like has a magnetic body and a permanent magnet, or both of which are formed by alternately stacking magnetic bodies and permanent magnets on concentric circles at equal intervals. The cross section was fan-shaped when viewed from the axial direction of the motor, and was laminated in the circumferential direction.

[0003]

However, in the conventional field magnet, it is necessary to make the cross section of the magnetic material and / or the permanent magnet as viewed from the axial direction of the motor fan-shaped. The fabrication of this fan shape is difficult and time consuming. When the field is made to have multiple poles, a large number of such fan-shaped permanent magnets and magnetic bodies are required, and there is a problem that processing and assembly of parts become complicated. Therefore, it is an object of the present invention to provide a field magnet which is inexpensive and can easily be made into a multi-pole by improving the shape of parts.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is designed such that magnetic bodies and permanent magnets are alternately laminated at equal intervals in the circumferential direction, and the permanent magnets are magnetized in the laminating direction. In a cylindrical motor field constituted by using a body as a magnetic pole, the magnetic body and the permanent magnet as viewed from the axial direction are formed into an involute curve.

[0005]

With the above means, the involute curve based on one circle has a constant distance between the two curves regardless of which two curves are selected. Also, the permanent magnet can be a flat plate. Therefore, since a normal silicon steel plate can be used as the magnetic body and a sheet-shaped flexible rubber magnet or the like can be used as the permanent magnet, the field can be inexpensively and easily configured.

[0006]

Embodiments will be described below with reference to the drawings showing embodiments of the present invention. Figure 1 shows that after bending the magnetic body and the permanent magnet,
It is a fragmentary sectional view of the field magnets laminated | stacked by turns. 1 in the figure
Is a field, 11 is a permanent magnet made of a rubber plate, 12 is a magnetic body made of a silicon steel plate, and 2 is a shaft. In order to bend into an involute curve, the method shown in FIG. 2 is used.
FIG. 2 is a sectional view of a single body of the magnetic body 11 that is bent into an involute curve. The involute curve is a curve 15 drawn by moving the end of the virtual thread 14 as shown in FIG. Magnetic body 11 formed by bending a circular shape along the involute curve 15
The field magnet 1 is formed by alternately laminating the permanent magnets 12 on the surface of the shaft 2. The permanent magnet 12 sandwiched between the magnetic bodies 11 is similarly bent. FIG. 3 is a partially enlarged view in which a part of the field magnet thus manufactured on the inner diameter side is enlarged. The irregularities on the inner diameter side and outer diameter side surfaces of the field magnet 1 are later cut or polished. The magnetic body 11 is shown by a dotted line, and the permanent magnet 12 is shown by a solid line, but as shown in the figure, the permanent magnets 12 are parallel to the circumferential direction so that the adjacent magnets sandwiching the magnetic body 11 have opposite magnetic poles. The magnetic body 11 in between functions as a magnetic pole. The permanent magnet 12 can also be manufactured as a thin film magnet by a sputtering method. When the sputtering method is used, the desired thickness can be directly formed on the curved magnetic body 11. Therefore, since the permanent magnet 12 does not need to be bent, it is easy to manufacture, and since the permanent magnet 12 can be made thin, it is easy to make the field magnet 1 multipolar.

[0007]

As described above, according to the present invention,
Since the flat plate-shaped magnetic body and the permanent magnet are bent into an involute curve and then laminated to form a cylindrical field magnet, there is an effect that a multipolar field magnet can be obtained easily at low cost.

[Brief description of drawings]

FIG. 1 is a field for a cylindrical motor of the present invention.

FIG. 2 is a partially enlarged sectional view of FIG.

FIG. 3 is a cross-sectional view of a single magnetic body of the present invention.

[Explanation of symbols]

 1: Field 11: Magnetic substance 12: Permanent magnet 13: Virtual circle 14: Virtual thread 15: Involute curve 2: Shaft

Claims (1)

[Claims] 1. A magnetic field for a cylindrical motor, wherein magnetic bodies and permanent magnets are alternately laminated at equal intervals in the circumferential direction of a shaft, and the permanent magnets are magnetized in the laminating direction to use the magnetic bodies as magnetic poles. The cylindrical magnetic field for a motor according to claim 1, wherein the shape of the magnetic body and the permanent magnet when viewed from the axial direction of the motor is formed in an involute curve shape.