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DC brushless motor

A DC brushless and motor technology, applied in the direction of electrical components, electromechanical devices, magnetic circuit rotating parts, etc., to achieve the effect of reducing vibration and noise

Inactive Publication Date: 2005-02-02
SHINANO KENSHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problems of conventional DC brushless motors

Method used

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Embodiment Construction

[0022] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0023] In the DC brushless motor of the present invention, the magnetic poles of the magnetic rotor are oriented anisotropically in polarity, and the magnetic poles are skewed with respect to the axis of the magnetic rotor.

[0024] will refer to figure 1 The orientation of the polar anisotropy of the magnetic rotor is illustrated. Coils 12 for orientation are arranged around magnets 10 for the rotor. By applying electrical energy to the coil 12 , the poles are anisotropically oriented in the magnet 10 . The direction of the orientation of the magnetic field in the magnet 10 is formed like an arc between adjacent different magnetic poles.

[0025] figure 1 , the magnet 10 has four magnetic poles, and N poles and S poles are alternately arranged along the circumferential direction.

[0026] In this embodiment, the magnetic poles are respectiv...

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Abstract

The DC brushless motor is capable of increasing an output power and reducing vibrations and noise. The DC brushless motor comprises: a magnet rotor, in which magnetic poles are polar-anisotropically oriented, wherein the magnetic poles are skewed with respect to an axial line of the magnet rotor.

Description

Background of the invention [0001] The invention relates to a DC brushless motor, in particular to a DC brushless motor capable of increasing output power and reducing noise. [0002] Magnetic rotors composed of magnets with high magnetic flux density and magnetized in the radial direction are conventionally used to realize compact and high-power DC brushless motors. However, radial magnetization causes cogging, which increases noise. [0003] In order to solve the cogging problem, a DC brushless motor is disclosed in Japanese Patent Publication No. 11-18377. A polar anisotropic magnet is used as the rotor. In a polar anisotropic magnet rotor, the direction of magnetic field orientation is formed like an arc between different magnetic poles, and the magnetic flux density distribution in the circumferential direction resembles a sine wave. With this structure, cogging of the DC brushless motor can be suppressed. [0004] Another DC brushless motor is disclosed in Japanese P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K1/22H02K1/27H02K15/03H02K29/00H02K29/03
CPCH02K29/03
Inventor 山崎宽幸小野高男
Owner SHINANO KENSHI