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. 04, 2013
Filed:
Dec. 22, 2009
Fumio Tajima, Hitachi, JP;
Yutaka Matsunobu, Hitachinaka, JP;
Masashi Kitamura, Mito, JP;
Noriaki Hino, Mito, JP;
Takashi Kobayashi, Hitachiota, JP;
Shigeru Kakugawa, Hitachi, JP;
Takashi Yasuhara, Yotsukaido, JP;
Fumio Tajima, Hitachi, JP;
Yutaka Matsunobu, Hitachinaka, JP;
Masashi Kitamura, Mito, JP;
Noriaki Hino, Mito, JP;
Takashi Kobayashi, Hitachiota, JP;
Shigeru Kakugawa, Hitachi, JP;
Takashi Yasuhara, Yotsukaido, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A permanent magnet rotating electric machine comprises a stator having stator windings wound round a stator iron core and a permanent magnet rotor having a plurality of inserted permanent magnets in which the polarity is alternately arranged in the peripheral direction in the rotor iron core. The rotor iron core of the permanent magnets is composed of magnetic pole pieces, auxiliary magnetic poles, and a stator yoke, and furthermore has concavities formed on the air gap face of the magnetic pole pieces of the rotor iron core of the permanent magnets, gently tilting from the central part of the magnetic poles to the end thereof. In a permanent magnet rotating electric machine, effects of iron loss are reduced, and an electric car using highly efficient permanent magnet rotating electric machine are realized.