Simple fully analytical copper loss model of litz wire made of strands twisted in multiple levels

Kazuhiro Umetani, Jesus Acero, Hector Sarnago, Oscar Lucia, Eiji Hiraki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The Litz wire has been widely utilized as a wire with a low copper loss under high-frequency operation. However, design optimization of the Litz wire is difficult because this wire generally has a complicated structure of thin strands twisted in multiple levels, which hinders both of the analytical and numerical prediction of the copper loss. To overcome this issue, recent studies have proposed the analytical models of the copper loss in the bundle of twisted strands, which is the basic components constituting the Litz wire. This paper constructs a simple analytical copper loss model of the Litz wire based on these preceding insights. In addition to these insights, the proposed model further considers the effect of the inclination angle of the strands to the Litz wire on the proximity effect loss. The proposed model was tested in comparison with the experimentally measured AC resistance of commercially available Litz wires. As a result, the predicted AC resistance showed good agreement with the measured ac resistance, suggesting the effectiveness of the proposed model.

Original languageEnglish
Title of host publication34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1257-1264
Number of pages8
ISBN (Electronic)9781538683309
DOIs
Publication statusPublished - May 24 2019
Event34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States
Duration: Mar 17 2019Mar 21 2019

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
Volume2019-March

Conference

Conference34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
CountryUnited States
CityAnaheim
Period3/17/193/21/19

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Keywords

  • AC resistance
  • Analytical model
  • Copper loss
  • Litz wire
  • Proximity effect

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Umetani, K., Acero, J., Sarnago, H., Lucia, O., & Hiraki, E. (2019). Simple fully analytical copper loss model of litz wire made of strands twisted in multiple levels. In 34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 (pp. 1257-1264). [8721827] (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC; Vol. 2019-March). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/APEC.2019.8721827