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. 19, 1991
Filed:
Jul. 20, 1990
Applicant:
Inventor:
Yoji Arita, Yokohama, JP;
Assignee:
Mitsubishi Kasei Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310254 ; 310154 ; 310261 ; 310 / ;
Abstract
A motor includes a field magnet system comprised of plural permanent magnetic poles arranged in a circle and an armature with plural poles each facing the magnetic poles of the field magnetic system. The widthwise length of a magnetic flux generating area of the permanent magnetic poles varies with the rotational angle to eliminate a cogging torque caused by higher harmonic wave components of the magnetic flux.