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Homogenization of foil windings with globally supported polynomial shape functions

Bundschuh Jonas, Späck-Leigsnering Yvonne, De Gersem Herbert

Archives of Electrical Engineering

2024

Vol. 73, nr 1

77--85

In conventional finite element simulations, foil windings with thin foils and with a large number of turns require many mesh elements. This renders models quickly computationally infeasible. This paper uses a homogenized foil winding model and approximates the voltage distribution in the foil winding domain by globally supported polynomials. This way, the small-scale structure in the foil winding domain does not have to be resolved by the finite element mesh. The method is validated successfully for a stand-alone foil winding example and for a pot inductor example. Moreover, a transformer equipped with a foil winding at its primary side is simulated using a field-circuit coupled model.