Finite Element Assisted Numerical Comparison of Single and Two Phase Inductively Coupled Power Transfer Systems

Pratik Raval, Dariusz Kacprzak, Aiguo Patrick Hu

Department of Electrical and Computer Engineering, The University of Auckland, Auckland, New Zealand.

DOI: 10.4236/jemaa.2013.57048                

Abstract

Inductively coupled power transfer systems (ICPT) are becoming ubiquitous in industry. Many such systems are excited with single or multi-phase input current. This leads to increased complexity in comparing such systems when solely using the magnetic frequency analysis. This paper utilizes modern finite element method analysis software to propose a novel software methodology for the numerical comparison of single and two phase ICPT systems as demonstrated on a three dimensional (3D) battery charging system. The sinusoidal magnetic frequency response of a single phase system is compared to the magnetic transient response of a multi-phase current system by use of a novel software methodology proposed in this paper. This consists of a transient response analysis to determine compute the resulting magnetic response over the duration of an input current period on the two phase system. The resulting non-sinusoidal response is then integrated over a whole period to extract the root-mean-square value for comparison with that of a single phase system across a 3D cubic power zone.

Keywords

Finite Element Method; Electromagnetics; Magnetics; Induction; Wireless-Power-Transfer

Conflicts of Interest

The authors declare no conflicts of interest.

References

[1]	E. Abel and S. Third, “Contactless Power Transfer—An Exercise in Topology,” IEEE Transactions on Magnetics, Vol. 20, No. 5, 1984, pp. 1813-1815. doi:10.1109/TMAG.1984.1063160
[2]	G. A. J. Elliott, G. A. Covic, D. Kacprzak and J. T. Boys, “A New Concept: Asymmetrical Pick-Ups for Inductively Coupled Power Transfer Monorail Systems,” IEEE Transactions on Magnetics, Vol. 42, No. 10, 2006, pp. 3389-3391.
[3]	D. Kacprzak, “A Novel S-Pickup for High Power Inductive Power Transfer Systems,” IEEE International Magnetics Conference, San Diego, 8-12 May 2006, p. 204.
[4]	H. Sakamoto, K. Harada, S. Washimiya, K. Takehara, Y. Matsuo and F. Nakao, “Large Air-Gap Coupler for Inductive Charger for Electric Vehicles,” IEEE Transactions on Magnetics, Vol. 35, No. 5, 1999, pp. 3526-3528. doi:10.1109/20.800578
[5]	J. M. Barnard, J. A. Ferreira and J. D. van Wyk, “Sliding Transformer for Linear Contactless Power Delivery,” IEEE Transactions on Magnetics, Vol. 44, No. 6, 1997, pp. 774-779.
[6]	D. Kacprzak, M. J. Gustafsson and M. P. Taylor, “A Finite Element Method Approach to the Design Process of an Aluminum Reduction Cell,” IEEE International Magnetics Conference, IEEE Transactions on Magnetics, San Diego, 8-12 May 2006, p. 668.
[7]	O. H. Stielau and G. A. Covic, “Design of Loosely Coupled Inductive Power Transfer Systems,” Proceedings of International Conference on Power Systems Technology, Perth, 4-7 December 2000, pp. 85-90.