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:
Jul. 12, 1988
Filed:
Apr. 22, 1987
Applicant:
Inventor:
Michael H Ranger, San Jose, CA (US);
Assignee:
NCR Corporation, Dayton, OH (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01P / ;
U.S. Cl.
CPC ...
318696 ; 318685 ; 318138 ;
Abstract
A nonoscillatory single step operation of a stepping motor is obtained by using normal driving circuitry and voltage to start the stepping operation in the desired stepping direction and by simultaneously starting a timer which is adjusted in duration to correspond to the time it takes for the rotor to almost reach the null position. At that time an increased voltage, of the same polarity as the normal stepping voltage, is applied, so as to strongly lock the rotor to the null position with minimum oscillation.