JP2001211573A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a simple structure and easy for making it with a thinned structure. SOLUTION: The motor is made of magnetic plate members laminated, and composed of a stator core 4 composed of a ring-shaped yoke 5 and a plurality of magnet pole teeth 6 projected from the surroundings of the yoke 5, a winding 7 winding on each magnet pole tooth 6, and a rotor core 9 borne at its center part so as to be capable of revolution and disposed of a rotor magnet 10 face- arranged at a given interval in a position on the periphery corresponding to the top end face 6a of each magnet pole tooth 6. Each magnet pole tooth 6 is folded to make slope to the lamination direction with a given angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor applied to, for example, a drive device for a magnetic disk or the like, and more particularly to a structure of a stator core thereof.

[0002]

2. Description of the Related Art Generally, a drive device such as a magnetic disk is required to be thin, so that a motor to be applied also needs to be thin. However, when attempting to reduce the thickness of the motor, the thickness of the stator yoke in the stacking direction cannot be increased, so that the area facing the rotor magnet is reduced, and the magnetic flux of the rotor magnet cannot be sufficiently captured. Can not be.
For this reason, for example, in Japanese Patent Application Laid-Open No. H7-245926, the opposing surfaces of the stator yoke and the rotor magnet are tapered, so that the length in the stacking direction is increased to increase the area of opposition to the rotor magnet. It is proposed to sufficiently capture the magnetic flux of the magnet to increase the driving torque of the motor.

[0003]

As described above, in the conventional motor, the facing surfaces of the stator yoke and the rotor magnet are tapered in order to increase the area facing the rotor magnet and obtain a desired driving force. Because it is formed, it is necessary to machine the magnetic pole surface of the rotor magnet, but in general, the permanent magnet that forms the magnetic pole is difficult to machine because the mechanical strength is small and easy to chip, and the structure becomes complicated. There were problems such as hindrance to thinning.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a motor having a simple structure and which can be easily made thin.

[0005]

A motor according to a first aspect of the present invention is formed by laminating plate-shaped magnetic members, and has an annular yoke portion and a plurality of radially protruding portions surrounding the yoke portion. A stator core composed of magnetic pole teeth, windings respectively wound around the magnetic pole teeth, and a rotor magnet which is rotatably supported at a central portion on a circumference corresponding to the tip end surface of each magnetic pole tooth at a predetermined interval. In a motor having a rotor core arranged, each magnetic pole taste is bent in a laminating direction and inclined at a predetermined angle.

[0006] A motor according to a second aspect of the present invention includes:
In the first aspect, the inclination angle is set in a range in which the tip end face of the magnetic pole taste is substantially parallel to the rotation center of the rotor core.

According to a third aspect of the present invention, there is provided a motor according to the first aspect, wherein the tip surface of the magnetic pole teeth is cut so as to be parallel to the rotation center of the rotor core.

Further, the motor according to claim 4 of the present invention is
In any one of the first to third aspects, the bent portion of the magnetic pole taste is formed wide.

Further, the motor according to claim 5 of the present invention comprises:
In any one of the first to third aspects, the base is formed integrally with the yoke portion of the stator core, and the wiring portion is arranged on the base.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view showing a configuration of a motor according to Embodiment 1 of the present invention, and FIG. 2 is a plan view showing a configuration of a stator core portion of the motor in FIG. In the drawing, reference numeral 1 denotes a base on which a wiring portion (not shown) and the like are disposed, and a notch 1a is formed at a predetermined position. Reference numeral 2 denotes a base disposed on the base 1 and a through hole 2a at the center.
The supporting member 3 formed with a shaft is a rotating shaft whose one end is rotatably fitted into the through hole 2a of the supporting member 2.

Reference numeral 4 denotes a stator core formed by laminating plate-like magnetic members. An annular yoke portion 5 is fixed to the outer peripheral portion of the support member 2, and a distal end surface 6a radially protruding from the periphery of the yoke portion 5. Each of the magnetic pole teeth 6 is bent at the root portion, and the tip end surface 6a is arranged to be inclined at an angle in a range that maintains substantially parallel to the rotation center of the rotation shaft 3. ing. 7 is a winding wound around each magnetic pole taste 6, and 8 is a rotating shaft 3.
A connecting member 9 connected to the other end of the connecting member 9 is a disk-shaped rotor core having a central portion fixed to the outer peripheral side of the connecting member 8, and the outer peripheral portion has a circle corresponding to the distal end surface 6 a of each magnetic pole tooth 6. Rotor magnets 10 are arranged on the circumference at predetermined intervals.

As described above, according to the first embodiment, each of the magnetic pole teeth 6 is bent at the root portion, and the tip end surface 6a is inclined by an angle within a range that is substantially parallel to the rotation center of the rotary shaft 3. Therefore, the area of the front end surface 6a facing the rotor magnet 10 can be increased by the amount of the inclination, so that a large amount of magnetic flux can be captured to increase the driving torque, and the length of the magnetic pole teeth 6 can be increased. Therefore, the number of windings of the winding 7 can be increased, the driving torque can be further increased, and the processing can be easily performed because the root of the magnetic pole teeth 6 can be merely bent. Becomes

The angle of inclination of the magnetic pole teeth 6 is 7 ° to 7 °.
By setting the angle up to about 15 °, it is possible to prevent the thinning from being hindered. Also, by bending and inclining the magnetic pole teeth 6, the opposing surfaces of the tip end surface 6a and the rotor magnet 10 are slightly inclined. 1/1 of the gap
It is permissible in terms of performance up to an inclination of about 0.
When the opposing surfaces are made parallel by cutting a, it is possible to eliminate the variation in the gap and further increase the driving torque.

Embodiment 2 FIG. FIG. 3 is a plan view showing a configuration of a main part of the motor according to Embodiment 2 of the present invention, and FIG. 4 is a side view showing a configuration of a main part of the motor in FIG.
In the figure, reference numeral 11 denotes a stator core formed by laminating plate-shaped magnetic members, and an annular yoke portion 12 fixed to an outer peripheral portion of a support member (not shown) similar to that in the first embodiment, It is formed of a plurality of magnetic pole teeth 13 formed radially protruding from the periphery of the yoke portion 12 and having a wide portion 13a at the base and a front end surface 13b at the front end, and each magnetic pole taste 13 is a portion of the wide portion 13a. And the front end surface 13b is inclined by an angle in a range that maintains substantially parallel to the rotation center of the rotation axis (not shown) of the rotor core, and the winding 7 is wound around the inclined portion. Have been.

As described above, according to the second embodiment, each magnetic pole tooth 13 is bent at the root, and the angle of the range in which the tip surface 13b is maintained substantially parallel to the rotation center of the rotation axis (not shown) of the rotor core. As described in the first embodiment, the magnetic pole teeth 13 are bent at the wide portion 13a as well as in the first embodiment. ,
It is possible to compensate for the decrease in the magnetic characteristics of the stator core 11 due to the stress generated at the time of bending, and to increase the driving torque.

Embodiment 3 FIG. 5 is a plan view showing a configuration of a main part of a motor according to Embodiment 3 of the present invention.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. 14 is a connecting portion 14a
A base 15, which is formed integrally with the stator core 4 through the base 14, is a wiring portion disposed on the base 14 for electrically connecting the winding 7 to an external circuit.

As described above, according to the third embodiment, the base 14 is formed integrally with the stator core 4 and the wiring portion 15 for electrically connecting the winding 7 and an external circuit is formed on the base. Since they are arranged, the number of parts can be reduced, and the configuration can be made inexpensively.

[0018]

As described above, according to the first aspect of the present invention, an annular yoke portion is formed by laminating plate-like magnetic members, and a plurality of yoke portions are projected radially from the periphery of the yoke portion. A stator core composed of magnetic pole teeth, windings respectively wound around the magnetic pole teeth, and a rotor magnet which is rotatably supported at a central portion on a circumference corresponding to the tip end surface of each magnetic pole tooth at a predetermined interval. In the motor having the arranged rotor cores, the magnetic pole teeth are bent in the laminating direction so as to be inclined at a predetermined angle, so that it is possible to provide a motor that has a simple structure and can be easily reduced in thickness.

According to a second aspect of the present invention, in the first aspect, the inclination angle is set to a range in which the tip end surface of the magnetic pole teeth is maintained substantially parallel to the rotation center of the rotor core. It is possible to provide a motor whose structure is easy to reduce the thickness and of which the driving torque can be increased.

According to a third aspect of the present invention, in the first aspect, the tip of the magnetic pole teeth is cut so as to be parallel to the rotation center of the rotor core.
It is possible to provide a motor that can be easily thinned with a simple structure and can further increase the driving torque.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the bent portion of the magnetic pole teeth is formed wide, so that the thickness can be easily reduced with a simple structure. Needless to say, it is possible to provide a motor capable of increasing the driving torque.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the base is formed integrally with the yoke portion of the stator core and the wiring portion is arranged on the base. Therefore, it is possible to provide a motor that can be easily formed into a thin structure with a simple structure and that can reduce the number of parts.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing a configuration of a motor according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a stator core portion of the motor in FIG.

FIG. 3 is a plan view showing a configuration of a main part of a motor according to a second embodiment of the present invention.

FIG. 4 is a side view showing a configuration of a main part of the motor in FIG. 3;

FIG. 5 is a plan view showing a configuration of a main part of a motor according to a third embodiment of the present invention.

[Description of Signs] 1,14 base, 3 rotating shafts, 4,11 stator core, 5,12 yoke, 6,13 magnetic pole taste, 6,
a, 13b Tip surface, 13a Wide part, 7 windings, 9
Rotor core, 10 rotor magnet, 15 wiring section.

Claims (5)

[Claims] A stator core formed by laminating plate-shaped magnetic members and comprising an annular yoke portion and a plurality of magnetic pole teeth radially protruding from the periphery of the yoke portion; And a rotor core having a center portion rotatably supported and a rotor magnet disposed at a predetermined interval on a circumference corresponding to a tip end surface of each of the magnetic pole teeth. A motor wherein a taste is bent in a stacking direction and inclined at a predetermined angle. 2. The motor according to claim 1, wherein the inclination angle is set in a range in which the tip end surface of the magnetic pole teeth is substantially parallel to the rotation center of the rotor core. 3. The motor according to claim 1, wherein a tip end surface of the magnetic pole teeth is cut so as to be parallel to a rotation center of the rotor core. 4. The motor according to claim 1, wherein the bent portion of the magnetic pole teeth is formed wide. 5. The motor according to claim 1, wherein the base is formed integrally with the yoke portion of the stator core, and a wiring portion is arranged on the base.