Permanent Magnet Synchronous Motor Control Based On Super-Twisting Positionless Sliding Mode Observer

Permanent magnet synchronous motor(PMSM)has the advantages of simple structure,small size,light weight,reliable operation,and high efficiency.In the closed-loop control of permanent magnet synchronous motors,the control performance is closely related to the accuracy of the feedback rotor position and speed.In the past,photoelectric or Hall position sensors were used to obtain rotor position and speed information.However,high-precision sensors have high costs,are greatly affected by the environment,and are not easy to install.Sensors with low accuracy have problems such as slow response speed and large error in obtaining values in practical engineering applications.Therefore,the development of no position control is very necessary for modern permanent magnet synchronous motor control systems and is also a hot research topic in the field of motor control.In order to improve the estimation accuracy of permanent magnet synchronous motor position free control,this paper studies a permanent magnet synchronous motor control method based on Super-Twisting position free sliding mode observer to overcome the inherent chattering problem of traditional sliding mode observer(SMO).Firstly,This article briefly introduced the design structure and working principle of permanent magnet synchronous motor.Through the analysis of rotating motor,derived the mathematical model of permanent magnet synchronous motor,and the frame and principle of coordinate transformation and vector control are introduced.Secondly,the sliding mode control theory is introduced in detail,and a position free vector control system for permanent magnet synchronous motors based on traditional sliding mode was designed.Then,to address the inherent chattering problem existing in the traditional sliding mode observer,this paper weakened the chattering from two aspects,such as generation and propagation chattering.At the generation stage of the chattering,a Super-Twisting algorithm was adopted to improve the traditional sliding mode observer and to achieve chattering suppression by hiding the high frequency switch in the integral term.In the Phase of chattering propagation,considering that the traditional arctangent function would amplify the chattering error when extracting the rotor position information,this paper adopted a rotor position estimation strategy based on Phase Locked Loop(PLL)to reduce the high-frequency chattering error when extracting the rotor position information,making the system position and speed estimation more accurate.Finally,in order to verify the effectiveness of using a Super-Twisting algorithm sliding mode observer(STA-SMO)to the permanent magnet synchronous motor,A twisting position-vector control system based on Super-Twisting was made to simulate with MATLAB/Simulink.At the same time,a d SPACE hemiphysical experimental platform was built,and conduct semi physical experimental verification on the position free vector control system of permanent magnet synchronous motor based on Super-Twisting algorithm sliding mode observer.By analyzing the simulation and experimental results,it was shown that the Super-Twisting algorithm was effective to restrain sliding mode buffeting and this algorithm had a certain practical engineering significance.