Patent ID: 9660561
Date: 2017-05-23
CPC Classifications: B60L,H02K,H02P,Y02T

Claim:
1. A motor drive device comprising: a general drive controller configured to control a motor unit for driving a wheel of an electric vehicle depending on a position of magnetic poles by using an angle detection value sensed by a motor angle sensor provided at the motor unit; a first motor angle estimator configured to estimate an angle of a motor rotor of the motor unit without using a rotation sensor; a sensor malfunction determiner configured to determine a malfunction of the motor angle sensor; a sensor switcher configured to cause the general drive controller to perform control using an estimation value of the motor rotor angle estimated by the first motor angle estimator instead of the angle detection value sensed by the motor angle sensor once the sensor malfunction determiner determines that the motor angle sensor malfunctions; and a start-up rotor angle calculator configured to calculate an angle of the motor rotor from a counter electromotive voltage of the motor unit and to cause the general drive controller to perform control using the calculated angle, when the motor unit is started up after stop of the motor unit in a state where the motor angle sensor is determined as malfunctioning by the sensor malfunction determiner.