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Reduction of eddy current losses in inductive transmission systems with ferrite sheets

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      Abstract

      Background

      Improvements in eddy current suppression are necessary to meet the demand for increasing miniaturization of inductively driven transmission systems in industrial and biomedical applications. The high magnetic permeability and the simultaneously low electrical conductivity of ferrite materials make them ideal candidates for shielding metallic surfaces. For systems like cochlear implants the transmission of data as well as energy over an inductive link is conducted within a well-defined parameter set. For these systems, the shielding can be of particular importance if the properties of the link can be preserved.

      Results

      In this work, we investigate the effect of single and double-layered substrates consisting of ferrite and/or copper on the inductance and coupling of planar spiral coils. The examined link systems represent realistic configurations for active implantable systems such as cochlear implants. Experimental measurements are complemented with analytical calculations and finite element simulations, which are in good agreement for all measured parameters. The results are then used to study the transfer efficiency of an inductive link in a series–parallel resonant topology as a function of substrate size, the number of coil turns and coil separation.

      Conclusions

      We find that ferrite sheets can be used to shield the system from unwanted metallic surfaces and to retain the inductive link parameters of the unperturbed system, particularly its transfer efficiency. The required size of the ferrite plates is comparable to the size of the coils, which makes the setup suitable for practical implementations. Since the sizes and geometries chosen for the studied inductive links are comparable to those of cochlear implants, our conclusions apply in particular to these systems.

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      Most cited references 16

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          Geometric approach for coupling enhancement of magnetically coupled coils.

          This paper presents a geometric approach for the enhancement of the coupling coefficient between two magnetically coupled coils. It is demonstrated that the coupling coefficient can be considerably enhanced, if the turns of the coils are not concentrated at the circumferences, but distributed across the diameters. For analysis, each of the two coils is assumed to be composed of concentric circular loops. The experimental results are in very good agreement with the theoretical results.
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            Author and article information

            Affiliations
            Institute of Mechatronics, University of Innsbruck, Technikerstrasse 13, 6020 Innsbruck, Austria
            Contributors
            Matthias.zangerl@uibk.ac.at
            ORCID: http://orcid.org/0000-0003-4628-3854, andreas.griessner@uibk.ac.at
            viktor.steixner@uibk.ac.at
            Clemens.zierhofer@uibk.ac.at
            Journal
            Biomed Eng Online
            Biomed Eng Online
            BioMedical Engineering OnLine
            BioMed Central (London )
            1475-925X
            5 January 2017
            5 January 2017
            2017
            : 16
            28086905
            5234259
            297
            10.1186/s12938-016-0297-4
            © The Author(s) 2017

            Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License ( http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver ( http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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            Research
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            © The Author(s) 2017

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