The thrust fluctuation suppression of segmented double sided linear induction motor

The long primary double sided linear induction motor (DSLIM) with segmented power supply is often used to increase power factor in electromagnetic acceleration applications. Some researchers analyzed the influence of end effect to thrust, but few focused on the thrust fluctuation in the block feeding change process. This paper establishes the mathematical model of DSLIM module and indicates the thrust fluctuation when the secondary enters a primary region or exits a primary region. A new field orientation formulation and the thrust expression are deduced in this paper. It shows that the thrust fluctuation is effectively reduced by increasing the slip frequency or optimizing the orientation. The simulation and experiment results verify the validity of the thrust fluctuation elimination method.

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