Sliding mode control with integral compensator structure for permanent magnet linear synchronous machine

LIU Ying-quan， LU Qin-fen， YE Yun-yue
（College of Electrical Engineering， Zhejiang University， Hangzhou 310027， China）

Abstract： Aiming at solving the high-frequency chattering and low anti-disturbance capacity in conventional variable structure control（VSC）method with sliding mode，a compensator scheme by introducing integral structure before control object was proposed. Based on the analysis of the permanent magnet linear synchronous machine（PMLSM）mathematical model，the position loop VSC state equations and equivalent control model were established and more accurate and comprehensive method for determining the control parameters and the equivalent model parameters was analyzed. Computer simulation with the motor parameters of a plate PMLSM verifies the feasibility and effectiveness of the compensator structure. The results indicate that the proposed structure，compared with the conventional VSC，can solve the vibration caused by external disturbance and load variations，and attenuate effectively the chattering. Through the analysis，the proposed structure can also overcome the system oscillations generated by mover mass and permanent magnet flux linkage，and improve the robustness and control precision of the system.
Key words： permanent magnet linear synchronous machine（PMLSM）； sliding mode control； integral compensator； servo control