Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Sensorless Transition Algorithm of PM Synchronous Motor by Load Torque Estimation
Authors 김동현(Dong-Hyun Kim) ; 조관열(Kwan-Yuhl Cho) ; 김학원(Hag-Wone Kim)
DOI https://doi.org/10.6113/TKPE.2021.26.5.349
Page pp.349-356
ISSN 1229-2214
Keywords PMSM; I-F control; Extended EMF sensorless control
Abstract Permanent magnet synchronous motors are mainly used in the traction of electric vehicle and home application products including air-conditioners and refrigerators. For sensorless control without rotor position sensors, I-F control is applied for initial starting at low speeds, and mode is changed to sensorless control when the rotor speed is sufficiently accelerated for estimating rotor position. When the mode is changed to the sensorless control from the open-loop starting, the initial integral value of the speed controller should be considered by load condition; otherwise, the transition to sensorless control may fail. The sensorless transfer algorithm of PM synchronous motor based on load condition for smooth transition is proposed. The performance of the proposed sensorless transfer algorithm was verified by experiments.