Abstract: A pulse-width modulator is used to control the sequence generator of a stepping motor to stabilize the stepping motor. One input to the pulse-width modulator is a cyclic sequence of pulses. The other input to the pulse-width modulator is an error-correction signal. The error-correction signal is proportional to variations about an average of the sum of the currents produced by the sequence generator. The error-correction signal is used by the pulse-width modulator to modulate the duration of individual pulses in the cycle sequence of pulses to produce a sequence of pulses of variable duration. The pulses of variable duration serve to control the sequence generator and stabilize the stepping motor.