Closed‐form complex permeability expression for proximity‐effect homogenisation of litz‐wire windings. Issue 3 (1st May 2020)

• Record Type: Journal Article
• Authors: Niyomsatian, Korawich; Gyselinck, Johan; Sabariego, Ruth V.
• Is Part Of: IET science, measurement & technology. Volume 14:Issue 3(2020)
• Page Start: 287
• Page End: 291
• Publication Date: 2020-05-01
• Subjects: eddy current losses -- wires (electric) -- magnetic permeability -- approximation theory -- transformers -- coils -- transformer windings; complex frequency‐dependent permeability -- closed‐form expression -- secondary coils -- proximity‐effect homogenisation -- litz‐wire windings -- eddy‐current losses -- proximity effect -- complex permeability expression -- two‐dimensional‐axisymmetric gapped transformer -- litz‐wire primary coils; Measurement -- Periodicals; Electrical engineering -- Periodicals; Electronics -- Periodicals; Nanotechnology -- Periodicals; Electromagnetism -- Periodicals; Medical instruments and apparatus -- Periodicals; 621.3
• DOI: 10.1049/iet-smt.2019.0377
• Languages: English
• ISSNs: 1751-8822

Abstract

Abstract : 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.