Prescribed-time Control Of Permanent Magnet Synchronous Motor Based On Super-Twisting Algorithm

Permanent magnet synchronous motor is famous for its high efficiency,high reliability,lightweight and other characteristics.It is widely used in industrial and agricultural production,transportation vehicles,aerospace and military industry and other fields.Permanent magnet synchronous motor(PMSM)is a typical multivariable nonlinear coupling system.There are many uncertain factors such as state saturation limitation,parameter perturbation and external disturbance,which directly affect the characteristics of the motor system.In order to meet the needs of more engineering applications,a permanent magnet synchronous motor system with better control performance is needed.With the development of automatic control system,the control strategy research for a single motor can not meet the requirements of rapid development of new technology in some specific scenarios,and multiple motors need to be controlled simultaneously.Therefore,it is of great significance to study the synchronous control of multi-motor system.Taking the permanent magnet synchronous motor system as the controlled object,this paper improved the super-twisting algorithm and studied the prescribed-time control strategy.Based on the vector control principle of permanent magnet synchronous motor(PMSM),a prescribed-time controller is designed to realize current decoupling control of the motor system and speed synchronization control of the multi-motor system.The main research results are as follows:1.The super-twisting algorithm for prescribed-time convergence was proposed.On the basis of the traditional super-twisting algorithm with finite-time convergence,a novel predetermined time super-twisting algorithm was designed by introducing time-varying gain function.Compared with the finite-time convergence results,the convergence time of the system can not be affected by the initial state value and other design parameters.By using the Lyapunov function method,the presupposition time stability of the system without or with disturbance term is proved.Finally,the effectiveness of the proposed algorithm is verified by Matlab simulation.2.A prescribed-time vector control strategy for PMSM was proposed based on the new super-twisting algorithm.The motor model is divided into two loops: the current loop and the speed loop.Using the inner and outer loop control idea,the prescribed-time controllers of PMSM are designed for the current loop and the speed loop respectively,and the current decoupling is realized.The current loop error and speed loop error can converge to zero within the prescribed-time under the control protocol of speed loop prescribed-time.Finally,the inner and outer loop Simulink simulation module based on vector control strategy is built to verify the effectiveness of the control strategy.3.A prescribed-time synchronization control strategy for multiple motors was proposed based on the new super-twisting algorithm.Aiming at the synchronous control problem of multimotor systems,a multi-motor synchronous controller based on super-twisting algorithm was designed to achieve the synchronization between the actual speed of the multi-motor and the expected speed in the prescribed-time.Finally,the effectiveness of the proposed synchronous control strategy is verified by simulating the speed of a multi-motor system.