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:
Feb. 07, 2012
Filed:
Dec. 30, 2009
Masanori Murakami, Kawasaki, JP;
Chanaporn Thanathihipong, Kawasaki, JP;
Wijittra Jabtanom, Kawasaki, JP;
Pairoj Patisonticharoen, Kawasaki, JP;
Masanori Murakami, Kawasaki, JP;
Chanaporn Thanathihipong, Kawasaki, JP;
Wijittra Jabtanom, Kawasaki, JP;
Pairoj Patisonticharoen, Kawasaki, JP;
Fujitsu General Limited, Kanagawa-Ken, JP;
Abstract
There is provided a permanent magnet motor capable of reducing cogging torque and torque ripple while suppressing a decrease in motor output. In a permanent magnet motorincluding a rotorin which a plurality of permanent magnetsare arranged in a ring shape as a magnetic field unit, the transverse cross section of the permanent magnethas an inside peripheryformed by a first archaving the center of curvature Oand the radius of curvature R, and an outside peripheryformed by a second archaving the center of curvature Oand the radius of curvature R, a third archaving the center of curvature Oand the radius of curvature Rand joined to one end of the second arc, and a fourth archaving the center of curvature Oand the radius of curvature Rand joined to the other end of the second arc. The above-described centers of curvature are disposed at different positions.