In this paper, we propose a novel variable pole pitch (VPP) electromagnetic (EM) propulsion\ntechnique using a series of ladder-slot-secondary double-sided linear induction motors (LS-secondary\nDLIMs). An equivalent circuit is developed for the LS-secondary DLIM, which considers the\ndistribution of the eddy current in the ladders and the end effect. This equivalent circuit forms\nthe basis for the subsequent design, numerical analysis, and optimization. The primary purpose\nof the VPP EM propulsion system is to address several obstacles encountered in high-speed\nlarge-thrust applications of LIMs, such as power factor improvement, optimization considering\nsupply frequency constraint and operating kinetics, etc. The equivalent circuit of the LS-secondary\nDLIM, i.e., the theoretical foundation of the VPP EM propulsion, has been validated via simulation\nand experimentation on a small-scale platform, which proves that the numerical analysis of the VPP\nEM propulsion is effective.
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