Title:
薄型ハイブリッド着磁型リング磁石、ヨーク付き薄型ハイブリッド着磁型リング磁石、および、ブラシレスモータ
Document Type and Number:
Japanese Patent JP3864986
Kind Code:
B2
Abstract:
The present invention provides miniaturization of brushless motors and brush motors used in electric devices, a ring magnet which simultaneously achieves both high torque and a reduction in cogging torque, a ring magnet with yoke, and a brushless motor. The thin hybrid magnetized ring magnet of the present invention is structured of, in a ring magnet comprised of a plurality of magnetic poles, a radially magnetized main pole and an interface for which the interface of the adjoining main pole is polar anisotropic. When the thin hybrid magnetized ring magnet structured in this manner is applied to a brushless motor, in the case of radial magnetizing, the abrupt change in magnetic flux of the interface between the magnetic poles becomes smooth and cogging torque is greatly reduced due to polar anisotropic magnetization of the interface. At the same time, by polar anisotropically magnetizing the interface between the magnetic poles, magnetic flux is concentrated on the radially magnetized main pole, and in comparison to only radial magnetization, maximum surface magnetic flux improves and it is possible to attain high torque.
Inventors:
Yoshinobu Honzo
Hiroshi Matsuoka
Daisuke Nagaya
Hiroshi Matsuoka
Daisuke Nagaya
Application Number:
JP2005511899A
Publication Date:
January 10, 2007
Filing Date:
July 22, 2004
Export Citation:
Assignee:
Aichi Steel Co., Ltd.
International Classes:
H02K1/27; H01F7/02; H02K21/16; H02K29/00; H02K29/03; H01F13/00; H01F41/02
Domestic Patent References:
| JP2001037197A | ||||
| JP2003203818A | ||||
| JP2003009438A | ||||
| JP62140877U | ||||
| JP5101956A |
Attorney, Agent or Firm:
Osamu Fujitani