METHOD AND APPARATUS FOR DRIVING STEPPING MOTOR

摘要

PURPOSE: To increase the output torque of a stepping motor by energizing the motor winding and then energizing the motor winding again with a higher voltage. CONSTITUTION: A low voltage is applied selectively to motor windings A, A' and B, B' by controlling transistor switches 3 through 6 using a logical signal group of phase A and phase B. After applying a low voltage, a transistor switch 7 is turned on by Ped logical signal and a high voltage is applied to an excited motor winding. According to the arrangement, a higher torque can be outputted from a stepping motor as compared with a conventional case.