AC Motor Control Device

An alternating-current (AC) motor control device that is capable of suppressing current harmonic components flowing through an AC motor and reducing a loss generated in the AC motor can be achieved. The AC motor control device includes a power converter that performs power conversion from direct current (DC) power to AC power, and a control unit that performs synchronous PWM control on the AC motor . The control unit includes carrier wave generation units , and that generate carrier waves, and PWM pulse generation units and that generate PWM pulses based on the carrier waves and a voltage command value A. The carrier wave generation units , and each change a cycle of the carrier wave so that harmonic components in d-q orthogonal coordinates of the AC motor are concentrated on a side of either a d axis or a q axis having a larger inductance, the harmonic components being included in the PWM pulse.