Abstract
AbstractThis paper presents the feasibility of technical fusion between wireless power transfer (WPT) based on resonance coupling system and superconducting technology to improve the transfer efficiency and spread the electromagnetic field widely in spite of small size coils. Until now, the various copper wires have generally been adopted in WPT system. From this reason, the transfer efficiency is limited since the copper wire keeps low Q intrinsically. On the other hand, as superconducting wires keep larger current density and higher Q value, the superconducting resonance coil can be expected as a reasonable option to deliver large transfer power as well as improve the transfer ratio since it exchanges energy at a much higher rate and keeps stronger magnetic fields out. In this study, we examined the transmission ratio using HTS and cooper wires in the antenna (Tx) or/and receiver (Rx) within input power of 500 W under various performances; copper Tx to copper Rx, HTS Tx to copper Rx, copper Tx to HTS Rx...
Highlights
Magnetically coupled resonators, each comprising a coil in series with a capacitor, were first used for wireless power transfer (WPT) by Nikola Tesla in the late 1800s
This paper presents the feasibility of technical fusion between wireless power transfer (WPT) based on resonance coupling system and superconducting technology to improve the transfer efficiency and spread the electromagnetic field widely in spite of small size coils
We achieved the technical fusion of WPT technology with HTS resonance coil in order to improve the delivery efficiency
Summary
Magnetically coupled resonators, each comprising a coil in series with a capacitor, were first used for wireless power transfer (WPT) by Nikola Tesla in the late 1800s. Marin Soljačić proposed resonance coils of the same resonant frequency to transfer wireless power over a distance of meters [3,4] This pioneer technique enables to transfer electric power at source power of 13.56 MHz with a power transfer efficiency of 40% within 2 m. The high Q factor resonators exchange energy at a much higher rate than they lose energy due to low damping ratio for each resonance coil as well as they are possible to keep much stronger magnetic fields out in the peripheral regions. From this reason, the WPT technology has been required for diffusion of various wires. Since HTS Tx and/or HTS Rx coils are cooled by different cooling vessels at the liquid nitrogen (77 K), separately, we estimate the cooling cost for HTS Tx and Rx coils under the proto-type experimental performance
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