| 摘要 |
PURPOSE:To suppress the electric vibration by providing a reactive power detector, detecting the amount proportional to the reactive power, and varying a voltage applied to an AC motor in response to the variation in the amount. CONSTITUTION:A reactive power is detected by a reactive power detector 8, and if the reactive power increases, a command for decreasing the output voltage by a voltage controller 6 is applied to a pulse generator 4, and if the reactive power decreases, a command for increasing the output voltage is applied to the generator 4. Thus, the amount proportional to the reactive power is detected to control the output voltage, thereby stabilizing the operation of an induction motor by suppressing the unstable phenomenon. |
