| 摘要 |
A motor drive device (20) is provided which allows control to be performed depending on a position of magnetic poles of a rotor even when a motor rotor angle sensor (36) malfunctions. The device (20) controls a motor (6) for driving a wheel of an electric vehicle (1), depending on the position of the magnetic poles by using an angle sensed by the angle sensor (36) provided at the motor (6). The device (20) includes an estimator (50) estimating an angle of a rotor (75) of the motor (6) without using a rotation sensor; a sensor malfunction determiner (47a) determining a malfunction of the angle sensor (36); and a switcher (47b) causing control to be performed using a angle estimated by the estimator (50) instead of the angle sensed by the angle sensor (36) once the determiner (47a) determines that the angle sensor (36) malfunctions. |
