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Patent Searching and Data


Title:
BRUSHLESS MOTOR
Document Type and Number:
WIPO Patent Application WO/2005/091467
Kind Code:
A1
Abstract:
A brushless motor, comprising a rotor (6) having a magnet body (1) with magnetic poles of 2m in quantity to which N-pole and S-pole are alternately magnetized in the rotating direction and a core (3) radially opposed to the magnet body and having a salient pole section (4) with salient poles of 3n in quantity around which a coil is wrapped. In the magnet body, the magnetic flux generating part of each pole is reduced by an electrical angle &agr less than a magnetic pole pitch and the open angle Ѳ of the salient pole is set to a specified electrical angle. Thus, the cogging torque of the brushless motor can be reduced, and the rotating accuracy thereof can be increased.

Inventors:
Fujinaka, Hiroyasu
Application Number:
PCT/JP2005/005598
Publication Date:
September 29, 2005
Filing Date:
March 18, 2005
Export Citation:
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Assignee:
MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD. (1006, Oaza Kadoma Kadoma-sh, Osaka 01, 57185, JP)
Fujinaka, Hiroyasu
International Classes:
H02K1/16; H02K1/27; H02K21/22; H02K29/00; H02K29/03; (IPC1-7): H02K1/27; H02K1/16; H02K21/22; H02K29/00
Foreign References:
JP2001016806A
JPH08322167A
JP61788473A
JP2003061326A
JPH1014141A
Attorney, Agent or Firm:
Iwahashi, Fumio c/o Matsushita Electric Industrial Co. Ltd. (1006, Oaza Kadoma, Kadoma-sh, Osaka 01, 57185, JP)
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