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:
Aug. 07, 2001
Filed:
Dec. 30, 1999
Masahiro Yasohara, Hyogo, JP;
Masakazu Senoh, Tottori, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A step-motor-driving device includes (a) a step-motor having driving-windings in plurality of phases, (b) an exciter for supplying power to excite driving-windings, (c) a position detector for detecting a position of a mover of the motor and outputs a position-detecting-signal, and (d) an excitation-timing-controller for receiving a driving-instruction-signal and a position-detecting-signal, and outputs an exciting signal to the exciter responsive to an input of one of the driving-instruction-signal and the position-detecting-signal. The excitation-timing-controller outputs the exciting signal responding an input of the driving-instruction-signal when an excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in a direction effective for the motor to rotate in a desirable direction, and the controller outputs the exciting signal responding an input of the position-detecting-signal when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs torque in an unfavorable direction for the motor to rotate in the desirable direction. This structure allows the step-motor-driving device to be free from jumping “out of sync”.