Electric motor control device

An electric motor control device, comprising:

• an electric motor control circuit that controls an inverter that supplies power to an alternating current electric motor, and into which a rotation angle signal for the alternating current electric motor output from an angle sensor and a current detection signal for the alternating current electric motor output from a detector are input;
• a rotation angle correction amount calculator that, based on the rotation angle signal and the current detection signal, calculates a rotation angle correction amount to correct a rotation angle error between the rotation angle signal and a magnetic pole position of the alternating current electric motor;
• and
• a rotation angle corrector that stores the rotation angle correction amount calculated by the rotation angle correction amount calculator, reads the stored rotation angle correction amount, and corrects the rotation angle signal, wherein
• the control device carries out a control of the alternating current electric motor based on the rotation angle signal corrected by the rotation angle calculator, and
• the rotation angle correction amount calculator, based on a current detection signal when a short circuit is caused between winding terminals of the alternating current electric motor, calculates at least either one rotation angle correction amount of a direct current component rotation angle correction amount and an alternating current component rotation angle correction amount.