Research of Sliding Mode Control with Integral Compensator for Permanent Magnet Linear Synchronous Machine

摘要

In order to solve the high-frequency chattering and low anti-disturbance in conventional variable structure control (VSC) method with sliding mode,a compensator scheme of introducing integral structure before control object is proposed.Firstly,the position loop VSC state equations and equivalent control model are established based on the analyses of the mathematical model of permanent magnet linear synchronous machine (PMLSM).Then it presents a more accurate and comprehensive method to determine the control parameters and the equivalent model parameters.Computer simulation with the motor parameters of a flat type PMLSM verifies the feasibility and effectiveness of the compensator structure.Compared with the conventional VSC,the proposed structure can solve the vibration caused by external disturbance and load variations,and attenuate the chattering effectively.It is concluded through further analyses that the proposed structure can overcome the system oscillations generated by mover mass and permanent magnet flux linkage,and improve the robustness and control precision of the system.