Speed control device for a stepping motor

摘要

A speed control device for a stepping motor comprises a timing detector (3,3') for producing timing pulses representative of the incremental advance of the stepping motor; a motor driving circuit (25), and a speed control circuit periodically actuating said motor driving circuit at least in part in response to said timing pulses during acceleration of the stepping motor. The speed control circuit includes a memory (43) for storing the time interval between respective actuations of the motor driving circuit during acceleration and actuates the motor driving circuit during deceleration of said stepping motor at intervals which are a function of the stored acceleration intervals, applied in reverse order.