Open AccessClosed‐form complex permeability expression for proximity‐effect homogenisation of litz‐wire windings
Author(s) -
Niyomsatian Korawich,
Gyselinck Johan,
Sabariego Ruth V.
Publication year - 2020
Publication title -
iet science, measurement and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.418
H-Index - 49
eISSN - 1751-8830
pISSN - 1751-8822
DOI - 10.1049/iet-smt.2019.0377
Subject(s) - electromagnetic coil , eddy current , permeability (electromagnetism) , transformer , rotational symmetry , materials science , acoustics , mechanics , electrical engineering , nuclear magnetic resonance , physics , engineering , chemistry , voltage , biochemistry , membrane
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.