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:
May. 19, 1981
Filed:
Nov. 11, 1977
Applicant:
Inventors:
Shigeki Kawada, Hino, JP;
Shigeaki Oyama, Hachioji, JP;
Yoshiki Fujioka, Hino, JP;
Mitsuhiko Hirota, Setagaya, JP;
Toyohiko Nishimori, Hachioji, JP;
Assignee:
Fujitsu Fanuc Limited, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318434 ; 318332 ; 318432 ;
Abstract
An actual speed N of a DC motor and an armature current Ia are detected to detect the motor output N.times.Ia. The motor speed is changed so that the detected motor output may not exceed a predetermined value. The spark generation of the motor brush is prevented when an over load is applied to the motor.