Time-Domain Homogenisation of Windings in 2D FE Calculations

In this paper the authors propose an original time domain extension of the frequency domain homogenization of multi-turn windings in FE models. The approach is applicable to different types of wire cross-sections (round, rectangular, ...) and packings (hexagonal, rectangular, ...). For the winding type at hand, an elementary FE model is used for determining dimensionless frequency and time domain coefficients regarding skin and proximity effect. The method is applied to a 144-turn inductor considering different winding types. The results obtained agree very well with those produced by an accurate but very expensive FE model in which all wires are finely discretised