| 摘要 |
PURPOSE:To allow quick and positive starting of a sensorless motor. CONSTITUTION:A controller 4 and a timer 5 control a time constant switching circuit 3 to switch the time constant of the starting circuit 15 for a motor drive circuit 10 thus switching the excitation switching frequency for the motor coils 1U, 1V, 1W in stepwise from low frequency to high frequency. |
