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Contribution of end-winding proximity losses to temperature variation in electromagnetic devices

Lookup NU author(s): Dr Rafal Wrobel


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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. © 2011 IEEE.

Publication metadata

Author(s): Wrobel R, Mlot A, Mellor PH

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industrial Electronics

Year: 2012

Volume: 59

Issue: 2

Pages: 848-857

Print publication date: 01/02/2012

Online publication date: 02/05/2011

ISSN (print): 0278-0046

ISSN (electronic): 1557-9948

Publisher: IEEE


DOI: 10.1109/TIE.2011.2148686


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