CONTROLLING METHOD FOR CONVERSION COMPENSATION OF INTERIOR PERMANET MAGNET SYNCHRONOUS MOTOR

摘要

The present invention relates to a method for controlling forward compensation of an interior permanent magnet synchronous motor (IPMSM) for an electric vehicle having a non-sinusoidal back electromotive force. The method includes the steps of: measuring d and q axis back electromotive forces of an IPMSM; generating a non-sinusoidal back electromotive force mathematical formula model including fundamental waves and odd harmonics through fast fourier transform (FFT) analysis of the measured back electromotive force; converting the non-sinusoidal back electromotive force mathematical formula model to d and q axis rotation coordinate systems by applying only 5^th and 7^th harmonics; and substituting the mathematical formula model converted to the d and q axis rotation coordinate systems for feedforward compensation voltage component of d and q axis voltage equations of the IPMSM, which is rotated at certain angular velocity, thereby reducing current pulsation and improving torque control.