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:
Sep. 22, 1992
Filed:
Dec. 07, 1990
Noriaki Ito, Yokohama, JP;
Soichi Hiramatsu, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A motor driving device for a motor having a rotor and a plurality of excitation coils includes a detector for detecting a rotation position of the rotor, a controller for performing closed-loop control of the switching timing for excitation currents applied to the excitation coils according to detection signals from the detector, and drive control circuits for controlling the current supplied to the excitation coils in accordance with an output from the controller. The drive control means includes a plurality of pulse-width modulation signal generators for controlling current passing through the excitation coils.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile