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Related Experiment Videos

Poynting vector analysis for wireless power transfer between magnetically coupled coils with different loads.

Yunsheng Guo1, Jiansheng Li2, Xiaojuan Hou2

  • 1Department of Applied Physics, Inner Mongolia University of Science and Technology, Baotou, 014010, China. gys03018@imust.edu.cn.

Scientific Reports
|April 9, 2017
PubMed
Summary

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Wireless power transfer uses evanescent fields for energy transmission. A resistive load is essential for this nonradiative energy transfer, unlike capacitive or inductive loads.

Area of Science:

  • Physics
  • Electrical Engineering

Background:

  • Wireless power transfer (WPT) typically operates in the near-field using nonradiative techniques.
  • Evanescent fields, usually confined and non-radiative, are generated by transmitting and receiving coils in WPT.

Purpose of the Study:

  • To theoretically investigate the mechanism of energy transfer via evanescent fields in WPT.
  • To analyze the role of terminal loads in enabling or inhibiting energy transfer.

Main Methods:

  • Theoretical analysis of two evanescent field distributions under varying terminal loads.
  • Simulation of magnetic field distributions and time-domain current waveforms.

Main Results:

  • Energy transfer in WPT relies on the superposition of evanescent fields, mediated by the terminal load.

Related Experiment Videos

  • Resistive terminal loads facilitate energy transfer, while capacitive or inductive loads result in a zero Poynting vector, preventing energy transfer.
  • Simulation results validate the theoretical findings on field distributions and current waveforms.

    • Conclusions:

    • The study elucidates the fundamental principle of energy transfer in magnetic resonant coupling systems.
    • A resistive load is critical for enabling nonradiative energy transfer through superimposed evanescent fields.