| 摘要 |
PURPOSE:To enable to select the optimum delay time with less torque shock in case of restarting by altering the delay time proportionally to a motor speed when an inverter restarts. CONSTITUTION:A motor speed signal 601 is applied through an inverter 96 to a converter 97, and a signal of a clock frequency inversely proportional to the motor speed is applied by a clock signal 971 to a counter 98. In this case, the clock signal 971 of the counter 98 is controlled to be inversely proportional to the motor speed so as to be higher at lower speed and lower at higher speed. The time from the stop of the inverter to the restart of the inverter is varied proportionally to the motor speed to feed an inverter drive signal 901' which varies at the restarting time of the inverter by an AND circuit 95''. |
