Patent ID: 6271641
Filing Date: 2001-08-07
Classification: H02P

Abstract:
A step-motor-driving device comprising:(a) a step-motor having a driving-winding for plurality of phases;(b) an exciter for supplying power to excite the driving-winding;(c) a position detector for detecting a mover of said step-motor and outputting a position-detecting-signal;(d) an excitation-timing-controller for receiving a driving-instruction-signal and the position-detecting-signal and outputting an exciting signal to said exciter responsive to an input of one of the driving-instruction-signal and the position-detecting signal,wherein said excitation-timing-controller outputs the exciting signal responding to the 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 said step-motor to rotate in a desirable direction, and outputs the exciting signal responding to the input of the position-detecting-signal when the excitation-switch of the driving-winding responsive to the driving-instruction-signal directs the torque in a direction reverse to the desirable direction for said step-motor to rotate in the desirable direction.