中文摘要：

和矢量控制相比，永磁直线同步电动机直接推力控制具有快速和鲁棒性特点。由于经典直接推力控制在电机参数变化和负载扰动影响下会产生推力波动，严重影响系统性能，为改善系统性能，采用一种新颖的自适应变结构控制器控制动子磁链和推力。计算出动子电压矢量，根据空间矢量调制（SVM）控制逆变器的开关频率。整个控制系统经仿真验证，证明在动子参数变化和负载扰动的影响下，系统具有平滑、快速的动子速度和推力响应。

英文摘要：

Compared with field oriented control （FOC）, direct thrust control （DTC） is known to provide fast and robust response for permanent magnet linear synchronous motor （PMLSM）. However, classical DTC produces notable thrust ripples because parameters variation and load perturbation. A novel adaptive variable structure controller is presented. The mover flux and thrust are controlled directly by adaptive variable structure controller, and mover voltage vectors calculated by the adaptive variable structure controller are applied to the motor by means of space vector modulation. Simulation results are presented to illustrate performances of the proposed method. The system provides smooth, fast mover speed and thrust responses and is robust with respect to motor parameters variation and load perturbations.