Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Three-dimensional magnetic field analytical model-based electromagnetic environment assessment of WPT systems

  • Bo Wang (School of Automation and Electronic Information, Xiangtan University) ;
  • Pingan Tan (School of Automation and Electronic Information, Xiangtan University) ;
  • Xu Shangguan (School of Automation and Electronic Information, Xiangtan University) ;
  • Guang Tan (School of Automation and Electronic Information, Xiangtan University) ;
  • Xining Xu (School of Automation and Electronic Information, Xiangtan University) ;
  • Yanming Wu (School of Automation and Electronic Information, Xiangtan University)
  • Received : 2023.05.20
  • Accepted : 2023.10.11
  • Published : 2024.02.20
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Abstract

Electromagnetic environment assessment is an important step in the design process of a wireless power transfer (WPT) system to ensure that it complies with electromagnetic radiation standards. Electromagnetic environment assessment usually requires an effective magnetic field analytical model. However, the traditional magnetic field analytical model does not consider the impact of shielding media on the external electromagnetic environment of the WPT system. Therefore, based on subdomain analysis technology in the Cartesian coordinate system, this paper establishes a three-dimensional magnetic field analytical model that comprehensively considers coil parameters, passive shielding media, and active shielding coils. To solve the problem of re-dividing various regions when migrating, a misalignment parameter was introduced in the modeling analysis. In addition, an efficient active shielding coil modeling method is proposed based on electromagnetic theory, which reduces the analytical calculation time of the model. Finally, a 200 W WPT system electromagnetic environment assessment platform that includes both active and passive shielding is built. Under different misalignment and transmission distance conditions, the maximum error of the model calculation and finite element analysis (FEA) is less than 3%, and the maximum error of the model calculation and measurement values is less than 8%. Research results verify the accuracy of the proposed three-dimensional magnetic field analytical model and the effectiveness of the shielding measures. This paper lays a theoretical foundation for the electromagnetic environment assessment of WPT systems and the pre-design of shielding measures.

Keywords

Acknowledgement

This work was supported by the Special Funding Support for the Innovative Construction in Hunan Province of China (2020GK2073).

References

  1. Mi, C.C., Buja, G., Choi, S.Y., Rim, C.T.: Modern advances in wireless power transfer systems for roadway powered electric vehicles. IEEE Trans. Ind. Electron. 63(10), 6533-6545 (2016)  https://doi.org/10.1109/TIE.2016.2574993
  2. Hu, A.P., Boys, J.T., Covic, G.A.: Frequency analysis and computation of a current-fed resonant converter for ICPT power supplies. In: International Conference on Power System Technology (CPST), pp. 327-332 (2000) 
  3. Pavelek, M., Frivaldsky, M., Spanik, P.: Influence of the passive shielding on the optimal working point of the wireless power transfer systems. International Symposium on Power Electronics Electrical Drives Automation and Motion (SPEEDAM). 773-778 (2018) 
  4. Patil, D., Mcdonough, M.K., Miller, J.M., et al.: Wireless power transfer for vehicular applications: overview and challenges. IEEE Trans. Transp. Electr. 4(1), 3-37 (2018)  https://doi.org/10.1109/TTE.2017.2780627
  5. Dong, Z., Li, X., Liu, S., et al.: A novel all-direction anti-misalignment wireless power transfer system designed by truncated region eigenfunction expansion method. IEEE Trans. Power Electron. 36(11), 12456-12467 (2021)  https://doi.org/10.1109/TPEL.2021.3082777
  6. Liorni, I., Bottauscio, O., Guilizzoni, R., et al.: Assessment of exposure to electric vehicle inductive power transfer systems: experimental measurements and numerical dosimetry. Sustainability 12(11), 1-25 (2020)  https://doi.org/10.3390/su12114573
  7. Chakarothai, J., Wake, K., Arima, T., et al.: Exposure evaluation of an actual wireless power transfer system for an electric vehicle with near-field measurement. IEEE Trans. Microw. Theory Tech. 66(3), 1543-1552 (2017)  https://doi.org/10.1109/TMTT.2017.2748949
  8. Kim, M., Park, S.W., Jung, H.K.: Numerical method for exposure assessment of wireless power transmission under low frequency band. J. Magn. 21(3), 442-449 (2016)  https://doi.org/10.4283/JMAG.2016.21.3.442
  9. Smeets, J.P.C., Overboom, T.T., Jansen, J.W., Lomonova, E.A.: Three-dimensional magnetic field modeling for coupling calculation between air-cored rectangular coils. IEEE Trans. Magn. 47(10), 2935-2938 (2011)  https://doi.org/10.1109/TMAG.2011.2145365
  10. Rosskopf, A., Bar, E., Jofe, C., Bonse, C.: Calculation of power losses in Litz wire systems by coupling FEM and PEEC method. IEEE Trans. Power Electron. 31(9), 6442-6449 (2016)  https://doi.org/10.1109/TPEL.2015.2499793
  11. Zhu, Z.Q., Wu, L.J., Xia, Z.P.: An accurate subdomain model for magnetic field computation in slotted surface-mounted permanent-magnet machines. IEEE Trans. Magn. 46(4), 1100-1115 (2010)  https://doi.org/10.1109/TMAG.2009.2038153
  12. Lopez-Alcolea, F.J., Real, J.V.D., Roncero-Sanchez, P., Torres, A.P.: Modeling of a magnetic coupler based on single and double-layered rectangular planar coils with in-plane misalignment for wireless power transfer. IEEE Trans. Power Electron. 35(5), 5102-5121 (2020)  https://doi.org/10.1109/TPEL.2019.2944194
  13. Pingan, T., Tao, P., Xieping, G., et al.: Flexible combination and switching control for robust wireless power transfer system with hexagonal array Coil. IEEE Trans. Power Electron. 36(4), 3868-3882 (2021)  https://doi.org/10.1109/TPEL.2020.3018908
  14. Shangguan, X., Tan, P., Tan, T., et al.: Unified magnetic field model of regular polygonal coils for electromagnetic assessment in WPT systems. J. Power Electron. 22(3), 522-533 (2022)  https://doi.org/10.1007/s43236-021-00371-0
  15. Smeets, J., Overboom, T.T., Jansen, J.W., et al.: Mode-matching technique applied to three-dimensional magnetic field modeling. IEEE Trans. Magn. 48(11), 3383-3386 (2012)  https://doi.org/10.1109/TMAG.2012.2194478
  16. Joy, E.R., Dalal, A., Kumar, P.: Accurate computation of mutual inductance of two air core square coils with lateral and angular misalignments in a Flat planar surface. IEEE Trans. Magn. 50(1), 1-9 (2014)  https://doi.org/10.1109/TMAG.2013.2279130
  17. Chen, X., Luo, J., Lin, D.: Analysis and visualization of magnetic field for multi-dimensional helmholtz coils based on PEEC. In: International Power Electronics and Application Symposium (PEAS), pp. 1-7 (2021) 
  18. Kushwaha, B., Rituraj, G., Kumar, P.: 3-D analytical model for computation of mutual inductance for different misalignments with shielding in wireless power transfer system. IEEE Trans. Transp. Electr. 3(2), 332-342 (2017)  https://doi.org/10.1109/TTE.2017.2649881
  19. Luo, Z., Wei, X.: Analysis of square and circular planar spiral coils in wireless power transfer system for electric vehicles. IEEE Trans. Ind. Electron. 65(1), 331-341 (2018) 
  20. Kushwaha, B.K., Rituraj, G., Kumar, P., et al.: A Subdomain analytical model of coil system with magnetic shields of finite dimensions and finite permeability for wireless power transfer systems. IEEE Trans. Magn. 56(12), 1-11 (2020)  https://doi.org/10.1109/TMAG.2020.3028992
  21. Luo, Z., Nie, S., Pathmanathan, M., et al.: 3-D analytical model of bipolar coils with multiple finite magnetic shields for wireless electric vehicle charging systems. IEEE Trans. Ind. Electron. 69(8), 8231-8242 (2022)  https://doi.org/10.1109/TIE.2021.3109519
  22. Dubas, F., Boughrara, K.: New scientific contribution on the 2-D subdomain technique in Cartesian coordinates: taking into account of iron parts. Math. Comput. Appl. 22(1), 17 (2017) 
  23. Demenko, A., Wojciechowski, R.M., Sykulski, J.K.: 2-D versus 3-D electromagnetic field modeling in electromechanical energy converters. IEEE Trans. Magn. Mag. 50(2), 897-900 (2014)  https://doi.org/10.1109/TMAG.2013.2282415
  24. Cruciani, S., Campi, T., Maradei, F., et al.: Active shielding design for wireless power transfer systems. IEEE Trans. Electromagn. Compat. 61(6), 1953-1960 (2019)  https://doi.org/10.1109/TEMC.2019.2942264
  25. Deng, Q., Liu, J., Czarkowski, D., et al.: Frequency-dependent resistance of litz-wire square solenoid coils and quality factor optimization for wireless power transfer. IEEE Trans. Ind. Electron. 63(5), 2825-2837 (2016) https://doi.org/10.1109/TIE.2016.2518126