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:
Apr. 06, 2004
Filed:
Jul. 24, 2001
Tsuneyoshi Tajima, Tokyo, JP;
Tomoaki Oikawa, Tokyo, JP;
Osamu Kazama, Tokyo, JP;
Koji Masumoto, Tokyo, JP;
Masaki Katou, Tokyo, JP;
Kazuhiko Baba, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To provide a permanent-magnet motor having a permanent magnet which can reduce the vibration and the noise without lowering the efficiency of the motor, the permanent-magnet motor according to, the present invention has a stator 1 having stator winding of plural phases, a rotor having a stator core facing to inside of the stator across a gap part and a permanent magnet provided to the rotor core. In the permanent-magnet motor, the permanent magnet is made to have both a convex part to the inner diameter side and a convex part to the outer diameter side in the cross section taken vertically to the rotation axis, and a focus of magnetic orientation of each magnetic pole of the permanent magnet is located outside of the rotor