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. 07, 1992
Filed:
Apr. 13, 1990
Applicant:
Inventors:
Yasuhiro Kondo, Hirakata, JP;
Satoshi Kawamura, Katano, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ;
Abstract
In a stepping motor having a plurality of phase windings, a phase-angle range of an electrifying signal for each of the phase windings is made smaller than 180.degree., and a counterelectromotive voltage generated in each of the phase windings is detected during an off time of the electrifying signal, to realize a closed-loop driving.