Research On Novel Non-singular Terminal Sliding Mode Speed Control Of Permanent Magnet Synchronous Motor Introducing Load Disturbance Compensation

Permanent magnet synchronous motors are widely used in aerospace,electric vehicles and industrial automation because of their simple structure,high reliability and ease of maintenance.Due to the complex and non-linear model of permanent magnet synchronous motors,classical PI control is difficult to achieve high performance requirements.Sliding mode variable structure control is robust to internal and external disturbances in the system and is simple and easy to implement,so it has been widely used in motor control.In order to solve the problem of poor speed and inherent jitter in the sliding mode control strategy for non-singular terminal control of permanent magnet synchronous motors,a new non-singular terminal sliding mode control strategy based on a new power-exponential convergence law is proposed,which combines the characteristics of the power convergence law and the expo-nential convergence law and introduces a new adaptive coefficient to effectively suppress the inherent jitter of the sliding mode and improve the convergence speed.At the same time,in order to improve the problem of poor dynamic performance of the sliding modee variable structure con-trol under load disturbance,a sliding mode torque observer is designed to observe the load torque in real time and perform feedforward compensalion,which improves the dynamic performance of the system and increases the robustness of the system.In this paper,a simulation model of a new non-singular terminal sliding-mode speed control strategy for permanent magnet synchronous motor with load disturbance compensation is built on MATLAB simulation software,and simulation analysis is carried out,while experimental analysis is carried out on a two-level voltage source inverter experimental platform based on the TMS320F28335 from TI to verify the new non-singular terminal sliding-mode speed control strategy for permanent magnet synchronous motor with load disturbance compensation respec-tively.The dynamic performance,steady-state performance and immunity performance of the new non-singular terminal sliding-mode speed control strategy for permanent magnet synchro-nous motors with the introduction of load disturbance compensation are verified respectively.The simulation and experimental results show that the new non-singular terminal sliding mode control strategy has a faster response speed than the non-singular terminal sliding mode control strategy,and the dynamic performance of the motor is better than that of the non-singular terminal sliding mode control strategy.The new non-singular terminal sliding mode control strat-egy with the introduction of load disturbance compensation has better immunity than the previous two control strategies and improves the immunity of the system.