Effects of Electro-Magnetic Properties of Obstacles in Magnetic Resonant Wireless Power Transfer

Ho-Yeong Lee, Sang-Hyeon Im and Gwan-Soo Park
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Ho-Yeong Lee: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea
Sang-Hyeon Im: Department of Electrical Engineering, Dong Eui University, Busan 47340, Korea
Gwan-Soo Park: Department of Electrical Engineering, Pusan National University, Busan 46241, Korea

Energies, 2021, vol. 14, issue 22, 1-11

Abstract: Magnetic resonant wireless power transmission (MRWPT) is a method of transmitting power over a long distance at a specific frequency. Because this system uses an alternating magnetic field, if an object with electrical/magnetic properties is placed between the transmit and receive coils, this will have a significant impact on the power transfer. In this paper, the effect of an obstacle located between two coils on the resonance frequency and transmission power is analyzed. A wireless power transmission system with a resonant frequency of 20 kHz was designed, and ferrite, aluminum, and carbon steel were selected as obstacles with permeability or conductivity. After simulating the system with finite element analysis (FEA) with these obstacles, the results were verified through actual experiments. The results show that the permeability of the obstacle decreases the resonant frequency, and the conductivity increases the resonant frequency and greatly reduces the output power. In addition, part of reduced output could be recovered by adjusting the frequency.

Keywords: finite element analysis; magnetic resonance; obstacle; wireless power transmission (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
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