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. 27, 2007
Filed:
May. 17, 2005
Toshihito Miyashita, Nagano, JP;
Satoru Onodera, Nagano, JP;
Toshihito Miyashita, Nagano, JP;
Satoru Onodera, Nagano, JP;
Sanyo Denki Co., Ltd., Tokyo, JP;
Abstract
A permanent magnet rotary motor that can maintain higher torque density and reduce cogging torque more greatly than a conventional permanent magnet rotary motor. A pair of end surfaces of each of permanent magnets used for a rotor are substantially parallel to a virtual plane that extends in the radial direction of a rotor core while passing through the centers of a stator core and an arc surface. Then, the length of the arc surface in the peripheral direction of a rotor core and inclinations of inclined surfaces are so determined that a pole arc ratio Ψof the arc surface and a pole arc ratio Ψof a magnetic pole surface in each permanent magnet satisfy the relation of P/2N≦Ψ−Ψ≦1.38×P/2N.