Synchronous machine control device, synchronous machine control method, and electric vehicle

Abstract

A synchronous machine control device drives and controls a synchronous machine, the synchronous machine control device including: a current command computation unit that calculates a difference between a current command value for the synchronous machine and an actual current flowing through the synchronous machine and generates a current command value by proportional-integral control; a voltage vector computation unit that generates a voltage command value including a coaxial voltage command value and an orthogonal axis voltage command value based on the current command value generated by the current command computation unit; a voltage limitation unit that limits the coaxial voltage command value in preference to the orthogonal axis voltage command value to prevent the voltage command value from exceeding a predetermined voltage limit value; and a correction amount calculation unit that calculates the amount of correction of a current command value for correcting the current command value based on limitation of voltage determined by the voltage limitation unit, the current command computation unit being configured to correct the current command value by the proportional-integral control based on the amount of correction of a current command value.