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:
Apr. 14, 1992
Filed:
Aug. 02, 1990
Applicant:
Inventors:
Hisatugu Ishikura, Katsuta, JP;
Seiji Yamashita, Katsuta, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Automotive Engineering, Ltd., Ibaraki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310154 ;
Abstract
A permanent-magnetic motor employs a skew structure in an armature iron core and an equal gap structure. A center line of a permanent magnet field pole is disposed to be shifted against a mechanical center line of the motor or a center line of the iron core. The magnet field pole is made to have an unequal pitch. A cogging torque generated at both end extending portions in the magnets is cancelled out. The cogging torque of the permanent-magnetic motor in power steering assistance such as for the automobile yields a smooth steering feeling sensitivity during the operation of the automobile.