Vector Control for the Linear Induction Motor Based on the Position Closed-Loop

Linear induction motor (LIM) can move along a line rail directly, so it is necessary and feasible to use the position closed-loop method. A mathematical model centered on the synchronous d-q reference frame is presented to analyze the LIM. The position closed-loop method and the secondary field oriented vector control strategy are induced in detail based on the mathematical model. Simulation and experiment are used to verify the truth of the proposed approach. And the relative error of the position is less than the velocity and is within 1%. The experimental results indicate that the approach and the control strategy can satisfy the engineer performance of the position required for the LIM.