基于新型切换函数的改进型超螺旋滑模观测器OA

Objective To achieve high-efficiency vector control of permanent magnet synchronous motors(PMSMs),obtaining accurate rotor angle and speed information is essential,as these two parameters are critically important.However,sensor installation is often impractical,necessitating the use of sensorless algorithms to estimate these parameters.Methods A sliding mode observer(SMO),known for its robustness and insensitivity to motor parameter variations,was employed for angle and speed estimation.An improved SMO,building upon the super-twisting sliding mode observer(ST-SMO),was proposed.This improved version employed a novel switching function,sin(arctan(nx)),to replace the conventional switching function.The stability of the system was proven using the Lyapunov stability criterion.Results The proposed improved SMO was simulated and evaluated.Results indicate that when the desired speed is set to 1,200 rad/min,the steady-state speed oscillation range of the improved observer is confined between 1,199.7 rad/min and 1,200.2 rad/min.Conclusion The improved super-twisting sliding mode observer demonstrates faster response,more effective chattering suppression,and more accurate angle estimation.It offers a promising new approach for sensorless control strategies in PMSMs.