| 摘要 |
PROBLEM TO BE SOLVED: To enable a voltage inverter device to output the voltage of a commanded value, by detecting the voltage of the DC power source of the inverter device and the output voltage of an inverter, finding an error voltage from the difference between the detected voltage and the commanded output voltage value of the inverter, and then, finding a corrected voltage from the error voltage and the commanded voltage value. SOLUTION: When the output voltage of an inverter circuit 4 drops due to the load fluctuation, etc., of an induction motor 5, an error voltage ΔV produced by the detected output voltage V of a detection circuit 31 and a commanded voltage value V(*) from a commanded voltage value setting means 29 increases. As the error voltage V increases, a commanded voltage correction value V1(*), namely, (V-ΔV) becomes larger. An inverter 4 is controlled with the output of a PWM signal generator 12 so that the detected output voltage of the circuit 31 can become constant. An inverter device can be constituted variable with respect to both factors of voltage and frequency by establishing a prescribed relation between a commanded frequency value F(*) which is another input signal of the generator 12 and the value V(*). Therefore, the inverter device can output the voltage of a command value. |
