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Optimal air-gap design in high-frequency foil windings

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2 Author(s)
Kutkut, N.H. ; Power Designers, Middleton, WI, USA ; Divan, D.M.

High-frequency AC losses are normally induced in transformer and inductor windings due to skin, proximity, fringing and other AC effects. In addition, the winding structure greatly affects the distribution of losses within the windings. Air gaps are usually placed in the core of magnetic devices to support the high magnetomotive force (MMF). Fringing fields can cause additional AC winding losses, and care must be taken to minimize these losses. In this paper, the effect of air-gap design on the induced losses is investigated. In particular, three air-gap designs-lumped, discretely distributed and uniformly distributed-are investigated and evaluated. Both one-dimensional (1-D) and finite-element analyses (FEAs) are used to investigate the different design structures

Published in:

Power Electronics, IEEE Transactions on  (Volume:13 ,  Issue: 5 )

Date of Publication:

Sep 1998

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