A Direct Thrust Control Based on Space Vector Modulation Strategy for Linear Induction Motor

To reduce the influence of the end effect of linear induction motor (LIM) and improve the LIM control performance, this paper introduces a direct torque control based on space vector modulation (DTC-SVM) strategy for LIM. A continuous stator voltage vector is generated by two PI controllers and applied to LIM using SVM, which provides flexibility in stator voltage selection and accuracy in thrust and flux control. In the LIM control, the proposed strategy shows not only a better thrust control effect but also has a constant and controllable switching frequency. More important, it is completely robust to the parameter changes caused by the end effect of LIM. Results verify the superiority of the proposed strategy in the LIM control.