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Closed-form complex permeability expression for proximity-effect homogenisation of litz-wire windings

par Niyomsatian, Korawich ;Gyselinck, Johan ;Sabariego, R.V.
Référence I E T Science, Measurement and Technology, 14, 3, page (287-291)
Publication Publié, 2020-05

Article révisé par les pairs

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Résumé :

The eddy-current losses in litz-wire windings are mostly due to the proximity effect, which can be macroscopically modelled via a complex frequency-dependent permeability. In this study, the authors propose a new closed-form expression for this complex permeability. Results are compared with approximations found in the literature in a wide-frequency range. For the sake of validation, a two-dimensional)-axisymmetric gapped transformer with litz-wire primary and secondary coils is studied.