A Performance Evaluation of Shaped Planar Inductor Windings in Gapped Core Applications Utilizing Turns With Constant DC-Resistance

Author

Pentz, D.C. ; Hofsajer, I.W.

Author_Institution

Ind. Electron. Technol. Res. Group, Univ. of Johannesburg, Johannesburg

fYear

2007

fDate

16-20 July 2007

Firstpage

1

Lastpage

6

Abstract

AC-losses in gapped-core planar inductor windings seem to be dominated by eddy losses induced by the time varying fringing flux near the air gap. Shaping the windings in the region of the gap reduces AC-losses but the reduction in width of planar foil conductors causes the DC-resistance to increase. The winding shape can be optimized using FEM-tools but the process is very time consuming. If the DC-resistance of the conductors is however kept constant by increasing its thickness a reduction in the AC-losses occurs continuously as the conductor tips are moved away from the gap. The optimum notch radius can now be predicted easily and is governed mainly by the geometry of the winding stack and core window. The predicted results are verified for a specific inductor design using a calorimetric experiment.

Keywords

air gaps; finite element analysis; inductors; DC-resistance; FEM-tools; air gap; constant DC-resistance; gapped core applications; performance evaluation; planar foil conductors; shaped planar inductor windings; time varying fringing flux; Africa; Conductors; Geometry; Harmonic analysis; Inductors; Industrial electronics; Manufacturing; Shape; Strips; Wounds;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Engineering Society Conference and Exposition in Africa, 2007. PowerAfrica '07. IEEE

Conference_Location

Johannesburg

Print_ISBN

978-1-4244-1477-2

Electronic_ISBN

978-1-4244-1478-9

Type

conf

DOI

10.1109/PESAFR.2007.4498109

Filename

4498109