Patent ID: 8604731

Claim:
A control device for an AC rotating machine comprising: current detection means for detecting a current supplied to the AC rotating machine as a detected current value; frequency correction value arithmetic means for outputting a frequency correction value; inverter frequency arithmetic means for outputting an inverter frequency based on a frequency command value and the frequency correction value; voltage command means for computing a voltage command value in accordance with the inverter frequency; and voltage application means for applying a voltage to the AC rotating machine based on the voltage command value, wherein the frequency correction value arithmetic means comprises: current deviation computing element for outputting a current deviation based on the detected current value and a current limiting command value; a constant storage memory for storing an electrical constant of the AC rotating machine; an amplification gain computing element for computing an amplification gain by using the electrical constant of the AC rotating machine outputted from the constant storage memory and an arbitrary response set value; an amplifier for amplifying the current deviation outputted by the current deviation computing element based on the amplification gain computed by the amplification gain computing element to compute a frequency correction arithmetic value; and an output selector for outputting the frequency correction arithmetic value as the frequency correction value in a predetermined running state of the AC rotating machine.