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. 01, 2013
Filed:
Mar. 06, 2009
Kiyomi Kawamura, Osaka, JP;
Takashi Ogawa, Osaka, JP;
Hiroshi Murakami, Osaka, JP;
Yuichi Yoshikawa, Osaka, JP;
Yasuyuki Yokouchi, Osaka, JP;
Kiyomi Kawamura, Osaka, JP;
Takashi Ogawa, Osaka, JP;
Hiroshi Murakami, Osaka, JP;
Yuichi Yoshikawa, Osaka, JP;
Yasuyuki Yokouchi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A rotor () is an interior permanent magnet rotor formed of a rotor core () in which a plurality of permanent magnets () are embedded at predetermined intervals. First protruding portions () and second protruding portions () are formed on an outer peripheral face of the rotor, the first protruding portions () each opposing the vicinity of a central portion of each of the permanent magnets and having a substantially arc-shaped cross section protruding outward and the second protruding portions () each opposing the vicinity of an end portion of each of the permanent magnets and protruding outward. One first protruding portion and two second protruding portions correspond to one permanent magnet. The formation of the first and second protruding portions as described above on the outer peripheral face of the rotor makes it possible to sufficiently reduce the torque ripple and the noise caused by the distortion of air-gap magnetic flux distribution.