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:
Mar. 08, 1988
Filed:
Dec. 26, 1985
Applicant:
Inventors:
Toshihiko Daido, Osaka, JP;
Yoshikazu Ikegi, Nara, JP;
Assignee:
Koyo Seiko Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01R / ; G01R / ;
U.S. Cl.
CPC ...
324545 ; 3241 / ; 318650 ;
Abstract
In a device for detecting an abnormal condition in a stepping motor, a second phase coil is provided which is in the relation of mutual induction with a first phase coil of the stepping motor to be tested for an abnormal condition, and the application and non-application of the supply voltage to the first phase coil under test is compared with the variation of the terminal voltage of the second phase coil, to detect the breaking of the first phase coil.