DRIVE CONTROLLER OF AC MOTOR

PROBLEM TO BE SOLVED: To enhance response of current control while ensuring robustness for parameter variation, and to facilitate mounting on a controller.SOLUTION: A current controller 20 calculates a d-axis current follow-up command value ifor making a d-axis current command value ifollow up a d-axis current detection value iwith target value follow-up characteristics, and calculates a q-axis current follow-up command value ifor making a q-axis current command value ifollow up a q-axis current detection value iwith target value follow-up characteristics. A noninterference controller 50 has transfer characteristics obtained by integrating a reverse characteristic model representing the relationship of the d-axis and q-axis voltages v, vfor the d-axis and q-axis currents i, iof an AC motor, and calculates the d-axis and q-axis voltage command values v, vcorresponding to the d-axis and q-axis current follow-up command values i, icalculated by the current controller 20.