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Optimization, design, and modeling of ferrite core geometry for inductive wireless power transfer

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Article type: Research Article

Authors: Strauch, Ludvika; * | Pavlin, Mojcab | Bregar, Vladimir Boštjana; b

Affiliations: [a] Kolektor Group, Kolektor Sikom, Magma, Ljubljana, Slovenia | [b] Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia

Correspondence: [*] Corresponding author: Ludvik Strauch, Kolektor Group, Kolektor Sikom, Magma, Ljubljana, Stegne 29, SI-1000 Slovenia. Tel.: +386 1 5833 144; Fax: +386 1 58 33 231; E-mail:[email protected]

Keywords: Ferrite cores, optimization, finite element method, wireless power transfer

DOI: 10.3233/JAE-150029

Journal: International Journal of Applied Electromagnetics and Mechanics, vol. 49, no. 1, pp. 145-155, 2015

Published: 2015
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Abstract

This paper presents a new design of ferrite core made of ferrite bars positioned in radial geometry. New core design is used in inductive wireless power transfer where the optimal design of ferrite bars was analyzed. Numerical simulations of seven ferrite bars geometries were performed in 3D models using Comsol Multiphysics in terms of the coupling coefficient. Two optimal designs of three and nine ferrite bars geometries were used for parameterization of geometric parameters. Both simulations of three and nine ferrite bars geometries were verified by measurements. Optimal design of nine ferrite bars geometry is proposed for use in wireless power transfer because of low consumption of ferrite material.

Ferrite bars geometry was also used as a magnetic shield to reduce magnetic fields which may interfere with the electronics nearby. Magnetic flux density in ferrite bars is low enough that prevents ferrite bars from the saturation. The angular alignment of optimal design of nine ferrite bars on the transmitter and receiver side was negligible as the difference in the coupling coefficient was 0.13%. Advantages of using optimal design of nine ferrite bars geometry are: high value of the coupling coefficient, low consumption of ferrite material, and reduced weight.

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