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A wireless power transfer system for electric vehicles is required to have high efficiency, a large air gap, and good tolerance for misalignment in the lateral direction and to be compact and lightweight. A new 3 kW transformer has been developed to satisfy these criteria using a novel H-shaped core and split primary capacitors. The design procedure based on the coupling factor k, the winding's Q,...
This paper describes evaluation of the characteristics of a small cloth transformer by considering the magnetic flux density distribution. We measured the flux density distribution in the magnetic core of a cloth transformer. Using the results, we calculated the coupling factors and ratios of the secondary to the primary voltage for cloth transformers under no load and with various types of winding,...
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