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:
Jul. 20, 2010
Filed:
Nov. 21, 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
A motor generally has a contradictory relation between decrease of cogging torque and increase of torque density. To overcome this problem, continuous direction control is provided for anisotropy with modification of magnetic poles so that the average absolute value of differences between Mθ and 90×sin [φ{2π/(360/p)}] is set to be 3° or less, where Mθ is a direction of anisotropy with respect to a radial tangent line of a magnetic pole plane, φ is a mechanical angle, and p is the number of pole pairs.