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.

中文翻译：

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考虑利兹线的二维时谐无线电力传输仿真中的递归域分解方法

基于具有 AVI 公式的二维时谐有限元 (FE) 模型的递归域分解方法用于对具有利兹线的无线电力传输 (WPT) 单元进行建模。类似的技术存在于文献中，但尚未应用于 WPT 单元。该方法生成的模型更新和解析速度明显快于传统 FE 模型，因此，它适用于执行线圈定位变化的参数化扫描。使用该技术，即使在股线数量非常多的情况下，也可以研究单个股线中出现的损耗。研究了绞合线绞合线之间的损耗分布，绞合线的数量从 7 到 925 不等。结果和速度与传统的 FE AVI 模型进行了比较。