Title:
永久磁石式電動機
Document Type and Number:
Japanese Patent JP4214998
Kind Code:
B2
Abstract:
A permanent magnet electric motor 10 comprises a rotor 30 provided with two stages of permanent magnets in the axial direction on an outer circumferential face of a rotor iron core, and having a shaft shifted by a stage skew angle thetar in electrical angle to decrease a first frequency component of cogging torque in the circumferential direction of the rotor iron core between two stages of the permanent magnets, a stator iron core 21 of cylindrical shape provided with the stator winding for producing a rotating magnetic field causing the rotor 30 to be rotated, and a stator 20 dividing the stator iron core 21 into plural blocks in the axial direction, and shifted by a stage skew angle thetas in electrical angle to decrease a second frequency component of the cogging torque in the circumferential direction of the stator iron core 21.
Inventors:
Takashi Miyazaki
Tomohiro Kikuchi
Haruyuki Yoneya
Shinichi Yamaguchi
Tomohiro Kikuchi
Haruyuki Yoneya
Shinichi Yamaguchi
Application Number:
JP2004570854A
Publication Date:
January 28, 2009
Filing Date:
April 11, 2003
Export Citation:
Assignee:
Mitsubishi Electric Corporation
International Classes:
H02K21/16; H02K1/12; H02K1/18; H02K1/22; H02K1/27; H02K1/28; H02K29/03
Domestic Patent References:
| JP2003032939A | ||||
| JP2003032930A | ||||
| JP2003032927A | ||||
| JP2000324768A | ||||
| JP2002512499A | ||||
| JP11136893A | ||||
| JP4021330A |
Attorney, Agent or Firm:
Shogo Takahashi
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka