METHOD AND CIRCUIT FOR FEEDING A SINGLE-PHASE STEPPING MOTOR

摘要

The method and circuit are particularly suitable for use in timepieces and are adapted to supply the motor with chopped-voltage pulses of variable durations as a function of the load conditions of the motor. A chopped pulse of variable duration T7 is composed of a partial pulse T4 of fixed duration and of a constant number of partial pulses T6i of variable duration, spaced by intervals T5i which are themselves determined by the duration of current drop between the preceding peak and a reference value. The durations T6i are proportional to the intervals T5i.