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Finite element models of dynamic-WPTS: a field-circuit approach

Manuele Bertoluzzo (Department of Industrial Engineering, University of Padova School of Engineering, Padova, Italy)
Paolo Di Barba (Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy)
Michele Forzan (Department of Industrial Engineering, University of Padua, Padua, Italy)
Maria Evelina Mognaschi (Department of Electrical, Computer and Biomedical Engineering, University of Pavia, Pavia, Italy)
Elisabetta Sieni (Department of Theoretical and Applied Sciences, University of Insubria, Varese, Italy)

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering

ISSN: 0332-1649

Article publication date: 26 January 2022

Issue publication date: 5 August 2022

117

Abstract

Purpose

The paper aims to propose a a field-circuit method for investigating the magnetic behavior of a wireless power transfer system (WPTS) for the charge of batteries of electric vehicles. In particular, a 3D model for finite element analysis (FEA) for the field simulation of a WPTS is developed. Specifically, the effects of aluminum shield and steel layer, representing the car frame, on the self and mutual inductances are investigated. An equivalent electric circuit is then built, and the relevant lumped parameters are identified by means of the FEAs.

Design/methodology/approach

The finite element model is used to evaluate self and mutual inductances in several transmitting-receiving coil configurations and relative positions. In particular, the FEA simulates the aluminum and steel layers as shell elements in a 3D domain. The self and mutual inductance values in the aligned coil case are also used as input parameters in a circuit model to evaluate the onload current.

Findings

The use of shell elements in FEA substantially reduces the number of mesh elements needed to simulate the eddy currents in the steel and aluminum layer, so putting the ground for low-cost field analysis. Moreover, the FEA gives an accurate computation of the self and mutual inductance to be used in a circuit model, which, in turn, provides a fast update of the onload induced current.

Originality/value

To save computational time, the use of 2D shell elements to model thin conductive regions introduces a simplified FEA that could be used in the WPTS simulation. Moreover, the dynamic behavior of WPTS, i.e. the operation when the receiving coil is moving with respect to the transmitting one, is considered. Because of the lumped parameters’ dependence upon the relative positions of the two coils, the proposed method allows identifying the circuit parameters for several configurations so substantially reducing the computational burden.

Keywords

Acknowledgements

This work has been partially supported by ENEA (Italian National Agency for New Technologies, Energy and Sustainable Economic Development) [project no. RdS/PTR2020/055].

Citation

Bertoluzzo, M., Di Barba, P., Forzan, M., Mognaschi, M.E. and Sieni, E. (2022), "Finite element models of dynamic-WPTS: a field-circuit approach", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 41 No. 4, pp. 1146-1158. https://doi.org/10.1108/COMPEL-10-2021-0403

Publisher

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Emerald Publishing Limited

Copyright © 2022, Emerald Publishing Limited

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