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. 16, 1984
Filed:
Apr. 27, 1981
Applicant:
Inventor:
Katsumi Kanayama, Tokyo, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318280 ; 318293 ; 3183 / ; 3183 / ;
Abstract
A motor brake device comprises a plurality of transistors for shunting a circuit loop through which a back electromotive force current caused by an inertia rotation of the motor flows, in which some of these transistors are operated as an inversed transistor (a transistor operated in a state where the collector and the emitter are interchanged with each other). The brake current for the motor flows through the collector-emitter paths of the transistor and the reversed transistor, each of which exhibits a small voltage drop. Therefore, the electromagnetic brake may effectively be applied to the motor even at a considerably low back electromotive force of the motor.