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Core Structure and Electromagnetic Field Evaluation in WPT Systems for Charging Electric Vehicles

Author

Listed:
  • Kamal Eldin Idris Elnail

    (School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Xueliang Huang

    (School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Chen Xiao

    (Shanghai Aerospace Control Technology Institute, Shanghai 2100096, China)

  • Linlin Tan

    (School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

  • Xu Haozhe

    (School of Electrical Engineering, Southeast University, No. 2 Sipailou, Nanjing 210096, China)

Abstract

The electromagnetic field (EMF) in a wireless power transfer (WPT) system needs to couple inductively between the primary and the secondary coils through a large air gap, thus giving the system a loosely coupled characteristic. Therefore, magnetically permeable material must be employed to improve the coupling and reduce leakage magnetic flux. However, adding an iron core increases the weight and introduces core loss as a new factor. In this paper, a WPT system model using a lumped circuit model is introduced. Moreover, the relationship between the relative permeability and the coupling coefficient in addition to the core amount (core thickness) and core loss are discussed. Three cores structure named: pot, slotted, and shaped bars cores are investigated using finite element method (FEM) software. Inspired by the investigation results, a new core structure using optimum shaped bars is proposed, the EMF level for reducing core loss in high-power transfer systems and in order to mitigate the EMF exposure to humans is intensively evaluated. The proposed core succeeded in reducing EMF and core loss by about 44% and 30%, respectively. The FEM software and physical prototype were used to validate the proposed optimum core structure. Results showed that 3.5 kW power transferred through a 20 cm air gap with 96% system efficiency(coil–coil).

Suggested Citation

  • Kamal Eldin Idris Elnail & Xueliang Huang & Chen Xiao & Linlin Tan & Xu Haozhe, 2018. "Core Structure and Electromagnetic Field Evaluation in WPT Systems for Charging Electric Vehicles," Energies, MDPI, vol. 11(7), pages 1-17, July.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:7:p:1734-:d:155760
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    References listed on IDEAS

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    1. Villa, Juan Luis & Sallán, Jesús & Llombart, Andrés & Sanz, José Fco, 2009. "Design of a high frequency Inductively Coupled Power Transfer system for electric vehicle battery charge," Applied Energy, Elsevier, vol. 86(3), pages 355-363, March.
    2. Yan Lu & Dongsheng Brian Ma, 2016. "Wireless Power Transfer System Architectures for Portable or Implantable Applications," Energies, MDPI, vol. 9(12), pages 1-16, December.
    3. Kafeel Ahmed Kalwar & Saad Mekhilef & Mehdi Seyedmahmoudian & Ben Horan, 2016. "Coil Design for High Misalignment Tolerant Inductive Power Transfer System for EV Charging," Energies, MDPI, vol. 9(11), pages 1-13, November.
    4. Linlin Tan & Jinpeng Guo & Xueliang Huang & Han Liu & Changxin Yan & Wei Wang, 2016. "Power Control Strategies of On-Road Charging for Electric Vehicles," Energies, MDPI, vol. 9(7), pages 1-14, July.
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    Cited by:

    1. Aqeel Mahmood Jawad & Rosdiadee Nordin & Sadik Kamel Gharghan & Haider Mahmood Jawad & Mahamod Ismail & Mahmood Jawad Abu-AlShaeer, 2018. "Single-Tube and Multi-Turn Coil Near-Field Wireless Power Transfer for Low-Power Home Appliances," Energies, MDPI, vol. 11(8), pages 1-19, July.
    2. Jianfeng Hong & Mingjie Guan & Zaifa Lin & Qiu Fang & Wei Wu & Wenxiang Chen, 2019. "Series-Series/Series Compensated Inductive Power Transmission System with Symmetrical Half-Bridge Resonant Converter: Design, Analysis, and Experimental Assessment," Energies, MDPI, vol. 12(12), pages 1-17, June.
    3. Xian Zhang & Xuejing Ni & Bin Wei & Songcen Wang & Qingxin Yang, 2018. "Characteristic Analysis of Electromagnetic Force in a High-Power Wireless Power Transfer System," Energies, MDPI, vol. 11(11), pages 1-13, November.
    4. Linlin Tan & Kamal Eldin Idris Elnail & Minghao Ju & Xueliang Huang, 2019. "Comparative Analysis and Design of the Shielding Techniques in WPT Systems for Charging EVs," Energies, MDPI, vol. 12(11), pages 1-20, June.
    5. Heqi Xu & Chunfang Wang & Dongwei Xia & Yunrui Liu, 2019. "Design of Magnetic Coupler for Wireless Power Transfer," Energies, MDPI, vol. 12(15), pages 1-12, August.
    6. Young Jin Hwang & Jae Young Jang, 2020. "Design and Analysis of a Novel Magnetic Coupler of an In-Wheel Wireless Power Transfer System for Electric Vehicles," Energies, MDPI, vol. 13(2), pages 1-22, January.

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