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Thrust Control of a Double-Sided Linear Induction Motor With Segmented Power Supply

Due to the dynamic longitudinal end effect, the motor flux is lagging and the thrust is fluctuated in a long-primary double-sided linear induction motor (DSLIM). In this paper, a thrust fluctuation reduction method is proposed for the DSLIM with segmented power supply. The mathematical model of the DSLIM module considering the dynamic longitudinal end effect is established first, and a new field orientation is presented by solving variation of the motor flux when the secondary enters or leaves a motor module. Then, the thrust expression is deduced based on the new field orientation, and a coefficient is proposed to present the thrust bias in a single module. The restraint of the thrust bias is implemented by increasing or changing the slip frequency according to the orientation in the movement. The proposed coefficient and the thrust control method are validated by simulation and experiment results.