Research On Vector Control Of Permanent Magnet Synchronous Motor Based On Super-twisting Sliding Mode

PMSM has been widely used in aerospace,ship traction,industrial robots,electric vehicles and other fields due to its remarkable advantages such as high efficiency,small size and reliable operation.However,there is still a big gap between my country and developed countries in some high-performance motor control systems.Therefore,it is of great significance to study the permanent magnet synchronous motor control system with high dynamic performance,high precision and strong robustness.On the basis of traditional sliding mode control,this paper studies the PMSM vector control technology based on super helical sliding mode.The specific research contents of this paper are as follows:Firstly,the mathematical model of PMSM under each coordinate system and its stator voltage and current equation are introduced,the technical principle and algorithm implementation of spatial voltage vector pulse width modulation technology(SVPWM)are described in detail,and the simulation model of PMSM vector control system is constructed and verified by using the vector control method of_di(28)0.Then,the basic principle of sliding mode control and its controller design method are expounded,the causes of chattering in sliding mode control are analyzed,and the definition and properties of super helical sliding mode algorithm are introduced.,large overshoot and other problems,the super helical sliding mode speed controller(STSMC)is designed by using the super helical sliding mode algorithm,and the permanent magnet synchronous motor vector control system based on STSMC is built;in addition,the boundary layer variable speed controller is also designed.The piecewise function replaces the symbolic function,and it is verified by simulation that STSMC has the advantages of small overshoot,strong anti-disturbance ability,and good speed regulation performance.Finally,in view of the problems of large chattering and low observation accuracy of traditional sliding mode observers,this paper uses a non-singular fast terminal sliding mode surface instead of a linear sliding mode surface,and uses the super-helix algorithm as the control law to design a non-singular fast terminal super Helical Sliding Mode Observer(NFTSTSMO),and its stability is proved using the Lyapunov function.Finally,in the MATLAB environment,the simulation model of the permanent magnet synchronous motor sensorless control system based on NFTSTSMO is established,and the simulation verification and analysis are carried out.The simulation results show that,liken to SMO,NFTSTSMO can effectively reduce chattering and improve the observation accuracy.