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. 28, 1997
Filed:
Jan. 19, 1995
Applicant:
Inventor:
Minoru Takahashi, Tokyo, JP;
Assignee:
NSK Ltd., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310156 ;
Abstract
A three-phase brushless motor includes a rotary shaft, a rotor fixed to an outer surface of the rotary shaft, and a drive coil of three phases disposed around the rotor. An outer surface of the rotor is magnetized to have alternately and equidistantly arrayed S and N poles and a plural number of low flux density regions are provided in a gap between the outer surface of the rotor and an inner surface of the drive coil.