Sensorless Control of Permanent Magnet Synchronous Motor Based on Super-Twisting Sliding Mode Active Disturbance Rejection

Traditional active disturbance rejection control (ADRC) speed control systems for permanent magnet synchronous motors (PMSMs) often suffer from a large number of adjustable parameters and complex tuning. To address this issue, an improved super-twisting sliding mode algorithm is designed and combined with linear active disturbance rejection control (LADRC). This results in the development of a super-twisting sliding mode ADRC speed controller for PMSM speed control systems. The tracking differentiator and linear state error feedback control rate in ADRC are optimized to enhance the system's rapid performance and simplify parameter tuning. Second, in order to realize the position sensorless control, the back-electromotive force in the motor equation was incorporated into the unknown disturbance and estimated by a linear extended state observer (LESO), and finally, the speed and rotor position information were extracted from the estimated back-electromotive force. Simulation results validate the effectiveness of this method.