关键词: 永磁同步直线电动机, 电流环, 比例积分控制, 滞环电流控制, 预测电流控制, 超螺旋滑模观测器

Abstract: The design of the current loop is a very important part of the permanent magnet synchronous linear motor (PMSLM) control system.All control strategies are ultimately the control of the output current of inverter.PI current control,hysteresis current control and predictive current control were used to achieve current closed-loop control of PMSLM,and the advantages and disadvantages of the above three current control methods were analyzed.Aiming at the delay and parameter disturbance in the prediction current control, the third-order super-twisting sliding mode observer was introduced to realize the observation and compensation of the disturbance,thus improving the robustness of the predictive current control.The experimental results show that the predictive current control method can satisfy both the accuracy and bandwidth requirements of the system. Compared with the former two methods,it has better control characteristics.

Key words: permanent magnet synchronous linear motor (PMSLM), current loop, PI control, hysteresis current control, predictive current control, super-twisting slide mode observer