Research on Sensorless Control for PMSM Based on Improved SMO
A novel sliding mode observer was analyzed and designed to address the problem of high frequen-cy jitter in the estimation of the back electromotive force of permanent magnet synchronous motors(PMSM)using traditional sliding mode observers(SMO),which results in significant position and speed errors.First-ly,starting from the principle of sliding mode variable structure control,the shortcomings of traditional SMO control functions were analyzed.Secondly,a new control function was designed to improve the problem of excessive estimation jitter caused by the use of switch functions in traditional sliding mode observers;Simul-taneously using frequency adaptive complex coefficient filters to replace traditional low-pass filters improves the accuracy of estimating rotor position and speed.Finally,algorithm simulation was built on the Matlab/Simulink platform,and the simulation results showed that the observer can effectively observe and track the motor speed and rotor position,effectively suppress high-frequency chattering,improve the estimation accu-racy of the sliding mode observer,and improve the stability of the PMSM sensorless control system.
万方数据
维普
