关键词: 永磁同步电机, 自适应控制, 超螺旋滑模观测器, 龙伯格观测器

Abstract: An improved adaptive super-twisting sliding mode observer was introduced for the sensorless control of permanent magnet synchronous motor ( PMSM) . With the intention of improving the chattering phenomenon of sliding mode, the piecewise square root switching function was devised to substitute the sign function. An adaptive scheme was designed to dynamically adjust the sliding mode coefficient, which can simultaneously consider the convergence speed of the
observer and the degree of chattering. Adaptive back-EMF estimator was designed to eliminate the back electromotive force noise and improve the identification accuracy. The Luenberger observer was designed to calculate the rotor speed and position, which can effectively reduce the phase delay and error of the identification position. Through the comparison experiments under different motor speed, it was verified that the proposed adaptive super-twisting sliding mode sensorless control strategy has superior performance in position and speed identification accuracy as well as dynamic performance.

Key words:  , permanent magnet synchronous motor ( PMSM), adaptive control, super-twisting sliding mode observer ( ST-SMO), Luenberger observer