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. 08, 2005
Filed:
Jun. 12, 2002
Yutaka Matsunobu, Hitachinaka, JP;
Fumio Tajima, Juoumachi, JP;
Shouichi Kawamata, Hitachi, JP;
Osamu Koizumi, Ibaraki, JP;
Sanshiro Obara, Tokai, JP;
Yutaka Matsunobu, Hitachinaka, JP;
Fumio Tajima, Juoumachi, JP;
Shouichi Kawamata, Hitachi, JP;
Osamu Koizumi, Ibaraki, JP;
Sanshiro Obara, Tokai, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A permanent magnet type electric rotating machine comprises a stator having a salient-pole concentrated winding, and a rotor disposed with a rotational gap, and having a plurality of permanent magnets arranged and fixed in a circumferential direction inside, and an auxiliary salient pole provided between the permanent magnets. A ratio of the number of poles for the rotor and the number of slots for the stator is 2:3 and, when a slot pitch of the stator is τs (electrical angle), an angle θ (electrical angle) made by a circumferential width of the permanent magnet in the surface of the stator side with an axis of the rotor is set at θ≈n×τs/2+8×m (n=1 or 2, and m=1, 2 or 3). Thus, pulsation torque, cogging torque or the waveform distortion of a no-load induced voltage is selectively reduced as occasion demands.