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:
Nov. 04, 2008
Filed:
Aug. 25, 2006
Fumio Tajima, Taga-gun, JP;
Yutaka Matsunobu, Hitachi, JP;
Shouichi Kawamata, Hitachi, JP;
Suetaro Shibukawa, Hitachinaka, JP;
Osamu Koizumi, Higashiibaraki-gun, JP;
Keiji Oda, Hitachinaka, JP;
Fumio Tajima, Taga-gun, JP;
Yutaka Matsunobu, Hitachi, JP;
Shouichi Kawamata, Hitachi, JP;
Suetaro Shibukawa, Hitachinaka, JP;
Osamu Koizumi, Higashiibaraki-gun, JP;
Keiji Oda, Hitachinaka, JP;
Hitachi, Ltd., Tokyo, JP;
Hitachi Car Engineering Co., Ltd., Hitachinaka-shi, JP;
Abstract
A magnetic gap is provided between a permanent magnet of a rotor and an auxiliary magnet pole portion which is arranged adjacent to the permanent magnet in a peripheral direction. A gradual change in a magnetic flux density distribution of a surface of the rotor is obtained and a cogging torque and a torque pulsation are restrained. By obtaining a reluctance torque according to the auxiliary magnetic pole, a permanent magnet electric rotating machine in which the cogging torque and the torque pulsation are restrained can be obtained and further an electromotive vehicle having the permanent magnet electric rotating machine can be provided.