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Energies 2018, 11(11), 3088; https://doi.org/10.3390/en11113088

Characteristic Analysis of Electromagnetic Force in a High-Power Wireless Power Transfer System

1
Tianjin Key Laboratory of Advanced Electrical Engineering and Energy Technology, Tianjin Polytechnic University, Tianjin 300387, China
2
China Electric Power Research Institute, Beijing 100085, China
*
Author to whom correspondence should be addressed.
Received: 15 October 2018 / Revised: 3 November 2018 / Accepted: 6 November 2018 / Published: 8 November 2018
(This article belongs to the Special Issue Wireless Power Transfer 2018)
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Abstract

In order to explore the influence of the electromagnetic force (EMF) on the coupling mechanism in a high-power wireless power transfer (WPT) system, the characteristics of the EMF are investigated by theoretical calculation and simulation. The expressions of the EMF on the WPT structure with magnetic shielding are derived in time domain and frequency domain, respectively. The EMF is divided into Lorentz force and Kelvin force. The distribution and changing regularity of the EMF on the coil and the magnetic shield under different exciting currents are solved by the finite element model, and the harmonic of the EMF is analyzed in detail. The results show that the coil is subjected to the EMF in both radial and axial directions. The EMF on the magnetic shield is opposite to the EMF on the coil, and the force between the transmitting coil and the receiving coil is repulsive. The frequency of the EMF is twice that of the system resonant frequency. An experimental prototype is built to prove the correctness of the predicted characteristics. It is shown that the EMF should be carefully considered in the application of high-power WPT systems. View Full-Text
Keywords: electromagnetic force (EMF); wireless power transfer (WPT); high-power; coupling mechanism; high-frequency current electromagnetic force (EMF); wireless power transfer (WPT); high-power; coupling mechanism; high-frequency current
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Zhang, X.; Ni, X.; Wei, B.; Wang, S.; Yang, Q. Characteristic Analysis of Electromagnetic Force in a High-Power Wireless Power Transfer System. Energies 2018, 11, 3088.

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