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. 08, 1992
Filed:
Oct. 23, 1991
Applicant:
Inventor:
Hiromitsu Ogasawara, Akishima, JP;
Assignee:
TACHI-S Co., Ltd., Akishima, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
318434 ; 361 23 ;
Abstract
A method of protecting a motor against overload, wherein a voltage of the motor is transformed into a pulse in a manner avoiding influence from the toque of motor, and such pulse having a width is compared with a motor revolution number so as to output an overload detection signal. The overload detection signal in excess of a present value is detected to stop the motor. A motor control device is also provided for that purpose, which includes a chopping wave generator circuit, an operational amplifier and a gate circuit.