JPH07308055A - Periphery opposing type motor - Google Patents

Abstract

PURPOSE:To provide a definite configuration of a motor having a high output efficiency with a small loss due to leakage magnetic flux. CONSTITUTION:A first and a second ring-shaped magnets 6 and 8 having different diameters and being magnetized with alternately different magnetic poles respectively are formed to a rotor of one united body of a concentric circle in such a manner that opposing magnetic poles become different poles through a predetermined air gap, and a stator core 10 is so fixed to a substrate 1 that the stator core 10 provided with a winding 9 is positioned at the air gap portion of the rotor supported rotatably by a shaft 2 with the center of the concentric circle as the center.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a peripherally opposed electric motor, and more particularly to a concrete structure for improving its efficiency.

[0002]

2. Description of the Related Art In a circumferentially opposed electric motor, an annular magnet having a back yoke is arranged outside an annular stator core provided with windings thereof. And a means for making a magnetic path longer by using a polar anisotropic magnet as a material of the magnet.

[0003]

At present, the miniaturization and high output of electric motors have progressed, and the gap between the stator core and the magnet by the conventional method has already become very small, and there is a limit to further reduction. Since a very high precision is required even in the method of forming the gap, it is not possible to expect a great improvement in efficiency despite the large cost. Even when a polar anisotropic magnet is used, the magnetic path in the magnet itself can be long, so that a significant improvement in efficiency cannot be expected.

The present invention is intended to solve the above-mentioned conventional problems, and an object of the present invention is to provide a concrete structure capable of greatly improving the efficiency of a circumferentially opposed electric motor.

[0005]

In order to achieve this object, the circumferentially opposed electric motor according to the present invention has first and second annular magnets having different diameters which are alternately magnetized. Is a rotor that is concentrically integrated so that magnetic poles facing each other through a predetermined gap are different poles, and in the gap portion of the rotor rotatably supported around the center of the concentric circle, It is characterized in that the stator core is fixed to the substrate such that the annular stator core on which the winding is applied is positioned.

[0006]

According to this structure, since the magnetic flux passing through the stator core from the inside to the outside or from the outside to the inside is given a large directivity, it is stable as a magnetic circuit, and
Since the loss due to leakage or the like is reduced, the efficiency is greatly improved, and the output efficiency of the electric motor is greatly improved by improving the efficiency of the magnetic circuit that is the source of the force generation.

[0007]

Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the structure of a circumferentially opposed shaft fixed electric motor according to an embodiment of the present invention. In FIG. 1, reference numeral 1 is a motor base, and a shaft 2 is attached by press fitting.

The lower part 4 is open and has a cylindrical projection 4a at the center. The hub is a substantially cylindrical hub, and is rotatably held by the shaft 2 by a bearing 3.

Reference numerals 6 and 7 are annular magnets having different diameters, in which S poles and N poles are alternately magnetized at equal intervals, and have different diameters. The magnets 6 and 7 are provided inside the hub via the current back yokes 5 and 7, respectively. As shown in FIG. 2, the magnetic poles different from each other are fixed so as to face each other with a predetermined gap therebetween, and constitute a rotor of the motor.

Reference numeral 10 denotes a stator core, which is arranged between the cuts 10a of the disk-shaped core holding plate 10 in which the cuts 10a are formed at equal intervals as shown in FIG. The winding 9 is provided by using 10a to form the stator of the motor.

As shown in FIG. 1, the stator is fixed to the motor base 1 so as to be located in the space between the annular magnets 6 and 7.

According to the above structure, the magnetic flux emitted from the N pole having the outer ring-shaped magnet 6 during operation passes through the stator core 10 and reaches the S pole of the inner ring-shaped magnet 8. Since the magnetic poles that attract each other face each other, the magnetic flux emitted from one has a strong directionality. Therefore, the magnetic circuit in the electric motor is stable and the loss such as leakage of magnetic flux is minimized, and the efficiency of the output of the electric motor is improved.

[0013]

As described above, according to the present invention, since the magnetic flux passing through the stator core from the inside to the outside or from the outside to the inside is given a large directivity, it is stable as a magnetic circuit, and the loss due to leakage etc. It is possible to improve the efficiency as a peripherally opposed electric motor.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a circumferentially opposed type shaft fixed electric motor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a magnetized state and a polar arrangement state of the annular magnet in the embodiment.

FIG. 3 is a perspective view showing a structure of a stator core according to the embodiment.

[Explanation of symbols]

 1 Motor base 2 Shaft 3 Bearing 4 Hub 6,8 Ring magnet 9 Winding 10 Stator core 11 Core holding board

Claims (1)

[Claims] 1. A first annular magnet and a second annular magnet having different diameters, each having different magnetic poles alternately magnetized.
A rotor is formed by concentrically integrating them so that magnetic poles facing each other through a predetermined air gap are different poles, and the rotor is rotatably supported around the center of the concentric circle. A circumferentially opposed electric motor, wherein the stator core is fixed to a substrate so that the annular stator core provided with the above is positioned.