MOTOR CONTROL DEVICE CAPABLE OF MEASURING TEMPERATURE OF ROTOR AND MOTOR PROVIDED THEREWITH

摘要

The motor control device of the present invention comprises a sensor gear expansion amount estimation part which estimates the amount of expansion of a sensor gear, a sensor mount expansion amount estimation part which estimates the amount of expansion of a sensor mount, a sensor gear expansion amount correction part which corrects the estimated amount of expansion of the sensor gear, and a rotor temperature estimation part which estimates the temperature of the rotor based on the corrected sensor gear expansion amount of the sensor gear.

主权项

1. A motor control device controlling a motor which comprises a sensor gear mounted to a rotor of the motor; a magnetic sensor which detects the presence/absence of each of a plurality of teeth provided successively at predetermined intervals on the outer periphery of the sensor gear as signals; a sensor mount to which the magnetic sensor is mounted; and a temperature detector which detects the temperature of the sensor mount;
wherein
the motor control device comprises:a sensor gear expansion amount estimation part which estimates the amount of expansion of the sensor gear based on the amount of change in the strength of the output signal of the magnetic sensor;a sensor mount expansion amount estimation part which estimates the amount of expansion of the sensor mount based on the temperature detected by the temperature detector;a sensor gear expansion amount correction part which corrects the estimated expansion of the sensor gear by subtracting the estimated expansion amount of the sensor mount from the estimated expansion amount of the sensor gear; anda rotor temperature estimation part which estimates the temperature of the rotor based on the corrected expansion amount of the sensor gear.