Characteristic comparison of different resonators to extend transfer distance in superconducting wireless power transfer for electric vehicle using high temperature superconducting resonance coil

• Main Authors: Yoondo Chung, Taewoo Lee, Seok Yong Lee
• Format: Article
• Language: English
• Published: Taylor & Francis Group 2017-01-01
• Series: Journal of International Council on Electrical Engineering
• Subjects: Electromagnetic resonance coupling; HTS resonance antenna; large transfer power
• Online Access: http://dx.doi.org/10.1080/22348972.2017.1333483

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. 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, and HTS Tx to HTS Rx, respectively, with 370 kHz RF generator at 30 cm distance. We obtained the comparative order for four different tests and confirmed that the transfer power efficiency with HTS Tx and Rx coils is improved over three times compared with copper Tx and Rx coils.