Research and Experimental Evaluation on the Control Strategy of the Linear Induction Motor for Maglev

Based on the analysis of the dynamic longitudinal edge effect of linear induction motor, a mathematical model considering the effect of edge effect on magnetization branch is established. The motor parameters are very important to improve controller performance, so the method to obtain motor parameters through finite element calculation is proposed and the parameters are queried online accurately. Then the calculation of command value considering thrust accuracy and the design of the sliding mode controller are proposed to enhance thrust accuracy and dynamic response of the system. Besides, a multi-mode modulation method is applied. A kind of synchronous modulation method based on the phase-locked loop is adopted, which reduces low-frequency harmonics and thrust ripples at high speed. Finally, the proposed control algorithm and modulation strategy are verified by experiments. The results show that the proposed control system has excellent control performance and robustness.