Magnetic design considerations to improve nonlinear characteristics of inductively coupled power transfer systems

• D. Kacprzak ^[1] ; J.K. Sykulski ^[2]
  1. [1] University of Auckland

     University of Auckland

     Nueva Zelanda

     
  2. [2] University of Southampton

     University of Southampton

     GB.ENG.M4.24UJ, Reino Unido

     
• Localización: Compel: International journal for computation and mathematics in electrical and electronic engineering, ISSN 0332-1649, Vol. 26, Nº 4 (Selected papers from the 19th Symposium on Electromagnetic Phenomena in Nonlinear Circuits 2006), 2007, págs. 965-973
• Idioma: inglés
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• Resumen

  • Purpose – This study seeks to apply finite element analysis to study the proximity effect in a multi‐pickup inductively coupled power transfer system, quantify the effect and propose improved pick‐up configurations.

    Design/methodology/approach – A mixture of approximate analytical formulae and accurate finite‐element simulations has been used as a tool for qualitative and quantitative analysis. Simplified consideration of magnetic flux paths aids understanding, whereas detailed numerical computation provides reliable performance prediction.

    Findings – It is shown that a multi‐pickup formation of conventional E‐pickups may lead to power loss due to negative coupling between neighbouring pickups and that the phenomenon is nonlinear. Thus, two novel configurations for multi‐pickup systems have been proposed, an alternately‐directed Z‐pickup and a spilt‐type E‐pickup, both showing improved linearity, increased total power and more efficient use of ferromagnetic material.

    Research limitations/implications – The investigation aimed mainly at the electromagnetic performance, while economic issues will still need to be addressed.

    Practical implications – The proposed pick‐up configurations may be very helpful in systems where improved performance is needed but space or configuration limitations restrict or eliminate the possibility of using other designs.

    Originality/value – The finite‐element aided magnetic field simulation has proved invaluable in achieving difficult design objectives. The combination of a simplified analytical approach and detailed numerical analysis has provided a reliable tool for accomplishing improved designs.