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:
Jun. 01, 1993
Filed:
May. 22, 1991
Toshikazu Ito, Tokyo, JP;
Oki Electric Industry Co., Ltd., Tokyo, JP;
Abstract
A method of controlling a stepping motor for supplying a drive current to each of the phase windings thereof in response to control signals. The control signals are formed by combining logically phase exciting signals and overdrive signals in synchronization with a clock pulse signal. Each of the overdrive signals also includes a pulse with a longer width at an earlier stage of a phase exciting duration during which a drive current flows in the stepping motor and a pulse with a shorter width at a later stage of the phase exciting duration. Hence, a small drive current flows in the phase windings after a later stage of the exciting duration, thus reducing power consumption.