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:
Jan. 06, 2009
Filed:
Jan. 15, 2003
Tomohiro Kikuchi, Tokyo, JP;
Takashi Miyazaki, Tokyo, JP;
Haruyuki Kometani, Tokyo, JP;
Shinichi Yamaguchi, Tokyo, JP;
Tomohiro Kikuchi, Tokyo, JP;
Takashi Miyazaki, Tokyo, JP;
Haruyuki Kometani, Tokyo, JP;
Shinichi Yamaguchi, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A permanent magnet motorincludes a rotor in which permanent magnetsare fixed. In the rotorthe outer peripheral shape of rotor magnetic-pole portionsis formed so that, in the circumferentially central portion, the distance from the center of the rotor iron coreis longest, and, at the inter-polar space, the distance from the center of the rotor iron core is shortest, and so that the outermost surface of the rotor magnetic-pole portionsforms an arc, and given that sheath thickness tc formed by the outer-side surface of each permanent magnetand the outermost surface of each rotor magnetic-pole portionis practically constant, and letting the thickness of the permanent magnets be the magnet thickness tm, then the relation tc/tm≦0.25 is satisfied.