Contribution of End-Winding Proximity Losses to Temperature Variation in Electromagnetic Devices

Rafal Wrobel*, Adrian Mlot, Phil H. Mellor

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

89 Citations (Scopus)

Abstract

This paper presents an investigation into proximity losses in end-windings informed from 3-D finite-element analysis of an ac power inductor. The proximity effect in winding conductors is a result of circulating ac currents caused by magnetic fields generated by nearby conductors. The calculated results confirm that the effects within the end-winding while significant are lower compared to those with the active length of the conductors. The common approach of predicting proximity losses using 2-D field analyses accounts for active length of the conductors only, and therefore, an end-winding correction factor is needed to obtain a more accurate estimate of loss. The theoretical prediction of losses within the inductor has been validated experimentally on a prototype inductor. A simple method to account for the interdependence of ac loss and temperature is presented and is shown to differ significantly from the well-known dc variation of resistance with temperature.

Translated title of the contributionContribution of End-Winding Proximity Losses to Temperature Variation in Electromagnetic Devices
Original languageEnglish
Pages (from-to)848 - 857
Number of pages9
JournalIEEE Transactions on Industrial Electronics
Volume59
Issue number2
DOIs
Publication statusPublished - Feb 2012

Keywords

  • Electric machines
  • electrothermal effects
  • end-winding
  • inductor
  • loss
  • motor drives
  • proximity effect
  • thermal analysis
  • DISCONTINUOUS CONDUCTION MODE
  • DC-DC CONVERTERS
  • LITZ-WIRE
  • TRANSFORMERS
  • HARMONICS
  • INDUCTOR
  • STRANDS

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