Optimal air-gap design in high-frequency foil windings

Author

Kutkut, Nasser H. ; Divan, Deepak M.

Author_Institution

Power Designers, Middleton, WI, USA

Volume

13

Issue

5

fYear

1998

fDate

9/1/1998 12:00:00 AM

Firstpage

942

Lastpage

949

Abstract

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

Keywords

air gaps; finite element analysis; foils; inductors; losses; magnetic cores; optimisation; skin effect; transformers; windings; 1-D analyses; MMF; air-gap design optimisation; design structures; discretely distributed air gaps; finite-element analyses; fringing fields; high-frequency AC losses; high-frequency foil windings; losses distribution; lumped air gaps; magnetic device cores; uniformly distributed air gaps; winding structure; Air gaps; Conductors; Finite element methods; Inductors; Magnetic analysis; Magnetic cores; Magnetic devices; Permeability; Skin; Strips;

fLanguage

English

Journal_Title

Power Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0885-8993

Type

jour

DOI

10.1109/63.712317

Filename

712317