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:
Aug. 13, 1991
Filed:
May. 22, 1990
Applicant:
Inventors:
Noboru Iwamatsu, Hino, JP;
Yoshiyuki Hayashi, Hino, JP;
Assignee:
Fanuc Ltd., Yamanashi, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02K / ; H02K / ;
U.S. Cl.
CPC ...
310156 ; 310261 ; 310265 ;
Abstract
Provided is a rotor structure by which slot ripple is reduced so that an a.c. synchronous servo motor can achieve a smooth rotation. A rotor structure is provided in which two rotor elements (30, 30') are juxtaposed and brought out of registration in a circular position by an angle (.theta.) corresponding to a half wave length of a slot ripple wave caused in a rotor having a prior structure, thereby each slot ripple wave caused by each rotor element (30, 30') is cancelled out by the other.