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학술대회 Modified Helical Coils Structure for Uniform Magnetic Flux Density
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김상원, 문정익, 김성민, 조인귀
Progress In Electromagnetics Research Symposium (PIERS) 2018: Toyama, pp.449-453
18ZR1200, 지능형 전파센서 및 무선 에너지 전송 원천기술 개발, 이호진
In this paper, we propose a coil structure with uniform magnetic field intensity and efficiency in the near field by using four helical coils with different turns ratio and diameter. In order to maintain a constant efficiency irrespective of the positional change of the receiving coil, the optimum number of required helical coils, turns ratio, and diameter can be determined by calculation through the proposed multiple helical coil modeling. Experimental results show that the conventional single helical coil generates a shadow region which cannot be charged near the center of the coil, and the magnetic field intensity at the coil edge is maximized, resulting in an uneven charging efficiency. However, the proposed structure has a very uniform charging efficiency.
KSP 제안 키워드
Charging efficiency, Constant Efficiency, Helical coils, Magnetic Flux Density, Magnetic field(MF), Magnetic field intensity, Optimum number, Uniform magnetic field, near-field, receiving coil