The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 2008
Filed:
Apr. 11, 2003
Takashi Miyazaki, Tokyo, JP;
Tomohiro Kikuchi, Tokyo, JP;
Haruyuki Kometani, Tokyo, JP;
Shinichi Yamaguchi, Tokyo, JP;
Takashi Miyazaki, Tokyo, JP;
Tomohiro Kikuchi, Tokyo, JP;
Haruyuki Kometani, Tokyo, JP;
Shinichi Yamaguchi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A permanent magnet electric motorcomprises a rotorprovided 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 θr 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 coreof cylindrical shape provided with the stator winding for producing a rotating magnetic field causing the rotorto be rotated, and a statordividing the stator iron coreinto plural blocks in the axial direction, and shifted by a stage skew angle θs in electrical angle to decrease a second frequency component of the cogging torque in the circumferential direction of the stator iron core