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

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3 Author(s)
Wrobel, R. ; Dept. of Electr. & Electron. Eng., Univ. of Bristol, Bristol, UK ; Mlot, A. ; Mellor, P.H.

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.

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Industrial Electronics, IEEE Transactions on  (Volume:59 ,  Issue: 2 )