CONTROL DEVICE FOR STEPPING MOTOR

摘要

PURPOSE:To prevent generation of position displacement of a rotor due to vibration or the like by applying voltage smaller than the rated voltage to an excitation coil at stopping time while contriving protection of a system previously by detecting a wire break and short-circuiting just before driving a stepping motor. CONSTITUTION:In a control device for a stepping motor wherein driving transistors Q1 to Q4 connected in series to driving coils L1 to L4 of the stepping motor are electrified so as to drive the driving coils L1 to L4 by exciting 1 phase or 1-2 phase, a parallel circuit of a control transistor Q5 and a resistor R is connected in series to each excitation coil.