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A Numerical Method to Reduce the Stray Magnetic Field Around the Asymmetrical Wireless Power Transfer Coils for Electric Vehicle Charging

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Abstract

Wireless power transfer (WPT) is becoming increasingly popular in stationary electric vehicle charging. Unfortunately, the adverse health effects due to the stray magnetic field created by the WPT coils have increasingly caused concern. However, the traditional stray magnetic field optimization design method based on finite element simulation is time-consuming and resource intensive. In this paper, a numerical method to reduce the stray magnetic field around the asymmetrical wireless power transfer coils is proposed while maintaining the transmission power constant. The formulas of the stray magnetic field around the WPT coils are derived, and the distribution characteristics of the stray magnetic field are analyzed in detail. The stray magnetic field around the asymmetrical wireless power transfer coils is optimized by the numerical method, and the number of the turns for the WPT coils corresponding to the minimum stray magnetic field intensity is obtained. The effectiveness of the numerical method is verified via the finite element analysis tool JMAG, and it is proved that the numerical method require less computational time than the finite element simulation. The experiments have also been carried out to evaluate the validity of the theoretical analysis.

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Acknowledgements

Manuscript submitted in June 16, 2020. This work was supported in part by the National Natural Science Foundation of China under and Grant 51577123

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Authors and Affiliations

  1. National & Province Joint Engineering Laboratory of Intelligent Electrical Apparatus, Taiyuan University of Technology, No.18, Xinkuangyuan Road, Taiyuan, China

    Wenjie Zhang, Jiancheng Song, Lingyan Lin & Lijun Zheng

  2. College of Electronic Information Engineering, Taiyuan University of Science and Technology, No.66, Waliu Road, Taiyuan, China

    Wenjie Zhang & Yunguang Gao

  3. State Grid Shanxi Electric Power Company Taiyuan Power Supply Company, Taiyuan, China

    Hui Ren

  4. Electrical and Computer Engineering, University of Auckland, 314-390 Khyber Pass Road, New Market, Auckland, 1023, New Zealand

    Yuan Song

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  1. Wenjie Zhang
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  2. Jiancheng Song
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  3. Lingyan Lin
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  4. Hui Ren
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  5. Lijun Zheng
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  6. Yunguang Gao
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  7. Yuan Song
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Correspondence to Jiancheng Song.

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Zhang, W., Song, J., Lin, L. et al. A Numerical Method to Reduce the Stray Magnetic Field Around the Asymmetrical Wireless Power Transfer Coils for Electric Vehicle Charging. J. Electr. Eng. Technol. 17, 1859–1871 (2022). https://doi.org/10.1007/s42835-021-00948-6

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  • DOI: https://doi.org/10.1007/s42835-021-00948-6

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