Research on Sensorless Control of PMSLM Based on Improved Constant Speed Reaching Law
In sensorless control of permanent magnet synchronous linear motor(PMSLM),the chattering phenom-enon of sliding mode observer is obvious in the process of running.How to reduce chattering and improve control ac-curacy has become a hot issue to be solved in sliding mode control.In this paper,a sliding mode observer based on the improved isokinetic approaching law is proposed.The hyperbolic tangent function is used to replace the chattering sign function,and fuzzy PI is introduced into the orthogonal phase-locked loop to estimate the velocity and position of the linear electric motor.The sensorless control system model of a permanent magnet synchronous linear motor was built in Matlab/Simulink,and the operation effect of the designed sliding mode observer was simulated and verified.The results show that this method can effectively weaken the high-frequency chattering of the system and improve the control accuracy,and the control effect is good.
Linear motorSensorless controlNew sliding mode observerOrthogonal PLL
NETL
NSTL
万方数据
维普
