Abstract: An alternating current motor control method capable of preventing or reducing variations in motor output torque in a low speed motor operation.During a low speed operation of a motor (6), a combination of a second pulse coder (PC2) for detecting the rotational position of a motor (6) with high resolution and a second table (T2) storing therein current command determining sinusoidal data with high resolution is selected by a processor, serving as selection means (20) and switches (SW1, SW.sub.2), so that sinusoidal data of respective phases are read out from the second table in accordance with a primary phase angle (.theta.) of the motor, which is determined by an actual motor rotational speed detected in dependence on the number (FP2) of pulses supplied from the second pulse coder, and the drive of the motor is controlled in accordance with current commands of respective phases derived with high resolution on the basis of the sinusoidal data, thereby preventing variations in the motor output torque.