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:
Oct. 25, 2011
Filed:
Nov. 15, 2007
Fumitoshi Yamashita, Nara, JP;
Hiroshi Murakami, Osaka, JP;
Yukihiro Okada, Osaka, JP;
Kiyomi Kawamura, Osaka, JP;
Fumitoshi Yamashita, Nara, JP;
Hiroshi Murakami, Osaka, JP;
Yukihiro Okada, Osaka, JP;
Kiyomi Kawamura, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
In a radial-direction gap type magnet motor, when an energy density increases, a direction change Mθ/φp of a static magnetic field with respect to a mechanic angle between different poles increases in an exponential manner and thus to decrease a cogging torque of the motor is not compatible to increase a torque density. In order to solve the problem, assuming that φt denotes a mechanic angle of a stator iron core teeth, φp denotes a mechanical angle of a magnetic pole, and Mθ denotes an angle of a static magnetic field with respect to a circumferential tangential line of a radial magnetic pole center, a radial-direction type magnet motor in which φt<φp, Mθ in a magnetic pole center region is 75 to 90°, and Mθ/φp≦7 is satisfied in the magnetic pole end region of φp×0.1°, and further, a static magnetic field generating source is configured as a magnetic anisotropic magnetic pole having an energy density (BH) max≧150 kJ/mis provided.