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:
Dec. 20, 1977
Filed:
Dec. 02, 1975
Applicant:
Inventors:
Isao Yamada, Chigasaki, JA;
Isamu Shibata, Musashino, JA;
Assignee:
Ricoh Co., Ltd., , JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318331 ; 318341 ; 318434 ;
Abstract
In the control system, the motor is supplied power in the form of a pulse train. The width of each pulse of the pulse train is modulated through the comparison between a reference voltage and the counter e.m.f. of the motor immediately prior to feeding of each pulse of the pulse train into the motor.