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. 05, 1982
Filed:
Mar. 18, 1980
Kazuo Watanabe, Hachioji, JP;
Hachiro Makabe, Fussa, JP;
Janome Sewing Machine Co. Ltd., Tokyo, JP;
Abstract
A control circuit is disclosed for operating a pulse motor which contains a first winding and a second winding. A first bridge can connect the first winding to a power source in two directions and can also disconnect the first winding therefrom. Likewise, a second bridge can so connect and disconnect the second winding from the power source. A sequencer operates the bridges so that such connection and disconnection takes place according to a predetermined sequence, in order to allow the motor to be rotated in discrete steps. A comparator stage compares current flowing through the first and second windings with an adjustable voltage reference, and regulates the bridges so as to regulate such current in accordance with a value to which the adjustable voltage reference has been adjusted. A means adjusts the adjustable voltage reference in accordance with the predetermined sequence. The control circuit reduces power consumption by the pulse motor and thereby allows a smaller torque pulse motor and a smaller power source to be utilized.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile