LAUSR

A recursive domain decomposition approach based on a 2-D time-harmonic finite element (FE) model with AVI formulation is used to model a wireless power transfer (WPT) unit with litz wires. Similar techniques exist in the literature, but they have not yet been applied to WPT units. The approach produces a model that is significantly faster to update and resolve than a traditional FE model, and hence, it is suitable for performing parametric sweeps where the positioning of the coils is varied. Using the technique, it is possible to study losses emerging in individual strands even with an extremely high number of strands. The loss distribution between the litz wire strands is studied, varying the number of strands from 7 to 925. The results and speed are compared with a traditional FE AVI model. The method yields the results up to a 1% relative error compared with the traditional model with significantly faster simulation time.