Patent ID: 8981694
Filing Date: 2015-03-17
Classification: H02P

Abstract:
1. A sensorless control apparatus of a motor, the apparatus comprising: a position estimator configured to compensate for a resistance of the motor and a magnetic flux of a permanent magnet of the motor according to a temperature of the motor, and configured to generate an estimated speed of a rotor of the motor based on the compensated resistance and the compensated magnetic flux of the permanent magnet; and a speed controller configured to generate a command current based on a command speed of the rotor and the estimated speed of the rotor; wherein the position estimator is further configured to measure a resistance value of the motor that changes according to the temperature of the motor, is further configured to estimate the temperature of the motor based on the measured resistance value, and is further configured to estimate a magnetic flux value of the permanent magnet based on the estimated temperature.