| 摘要 |
PURPOSE:To reduce the vibration and noise of an inverter device by detecting the slip of a load motor and varying the output voltage in response to the slip. CONSTITUTION:A voltage instruction correcting circuit 15 inputs a slip signal omegaS from a slip frequency signal amplifier 9. Then, the output Vref of a voltage instruction circuit 11 is corrected in response to the value of the absolute value ¦omegaS¦ of the slip signal omegaS. The voltage and frequency applied to a motor 5 are controlled by the corrected output Vref. Thus, the voltage applied to the motor 5 is suppressed to a value smaller than the rated value at the light load time, and controlled to approach the rated value in response to the increase in the load, and torque ripple at the light load time can be reduced. |
