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This paper presents the derivation and investigation of a practical model structure for a large-capacity WPT system capable of powering a railway system. Comparative analyses of the secondary pickup induced voltages and rail induced voltages for various WPT models are conducted to derivate the optimal WPT model which could be applied to railway vehicles. Through the analyses for various WPT models, a coreless-type WPT model structure, which has the same dimension and performance as the secondary pickup module of the conventional core-type WPT model, is derived. In order to verify the characteristic analysis results from the simulation method of the core-type and coreless-type WPT models, small-scaled proto-models are manufactured for both the conventional core-type WPT model and the coreless-type model which has the best performance. It is confirmed that the coreless-type WPT model could have similar performance with the core-type WPT model through performance tests.

A Study on the High-efficiency Coreless-typed Wireless Power Transfer System for Railway Transit