Motor control for reducing high harmonic currents

A motor control apparatus comprises a fundamental current control means (2) for controlling a fundamental current in a 3-phase AC motor (M) in an orthogonal coordinate system constituted of a d-axis and a q-axis rotating in synchronization with the rotation of the 3-phase AC motor (M), a higher harmonic current control means (3) for controlling a higher harmonic current in the motor (M) in an orthogonal coordinate system constituted of a dh-axis and a qh-axis rotating at a frequency that is an integral multiple of the frequency of the fundamental component of the current flowing to the motor (M), an estimation means (35, 35A, 38) estimating the level of the harmonic speed electromotive force in the motor (M) in the dhqh-axis coordinate system and a compensation means (36) for compensates the harmonic speed electromotive force estimated by the estimation means.