SYSTEM AND METHOD FOR CONTROLLING MOTOR WITHOUT SENSOR

摘要

Provided are a sensorless control method and system for a motor. The present invention relates to the sensorless control system for a motor in which a model considering an iron loss is added to a back electromotive force (EMF) observer and an electrical angle error considering the iron loss is obtained to stably operate a sensorless control at a high-speed range of the motor. To this end, according to an embodiment of the present invention, the sensorless control system for a permanent magnet motor includes: a back EMF observer for estimating a back EMF of the motor; an angle error calculator for calculating the electrical angle error by taking into consideration the iron loss of the permanent magnet motor based on the back EMF estimated by the back EMF observer; an angle error compensator for compensating for the electrical angle error calculated by the angle error calculator, in which an electrical angle for compensating for the calculated electrical angle error is obtained through simulation or experiment for the permanent magnet motor; and a phase-locked loop (PLL) controller for estimating an actual angle by reducing the electrical angle error due to the iron loss after receiving the compensated electrical angle, and outputting a sensorless control result signal as an estimated value of the angular velocity of the motor based on the estimated actual angle.