| 摘要 |
<p>PURPOSE:To rapidly stop a motor by switching the motor from a high speed operation to a low speed operation, then interrupting an input to a ring counter to stop the counter, and stopping a chopper by a delay of the prescribed period. CONSTITUTION:3-phase AC is supplied by an inverter I to a motor M. When the voltage of a speed setter 1 is reduced, the frequency of a V/F converter 3 increases, and the rotation of the motor M increases. When the set voltage of the setter 1 is raised, the output side of an operational amplifier 2 becomes negative voltage, and the collector of a tranistor TF becomes negative voltage through a diode D. Accordingly, a clock signal is not inputted to a ring counter RC, which is then stopped. As a result, only two transistors which form a current circuit of one phase in the inverter I are conducted, a DC current is flowed to the motor M, and the motor M is stopped.</p> |
