Operating Characteristics for Different Resonance Frequency Ranges of Wireless Power Charging System in Superconducting MAGLEV Train

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Abstract
Our research team has been developed wireless pow-er charging (WPC) system for high speed superconducting mag-netic levitation (MAGLEV) train based on the strong resonance coupling method to improve the transfer efficiency and stability. Especially, the range of resonance frequency is one of main key design parameters to fabricate the system since the high reso-nance frequency can improve the transfer distance easily. On the other hand, since the sensitivity of impedance matching between antenna and receiver coils is increased in the range of higher fre-quency, the technique of stable impedance matching design in-cluding elaborated rectifying sub-circuit has been required to commercialize under high power transfer applications. From this reason, the various transfer characteristics under different rang-es for resonance frequency conditions should be evaluated to ac-complish improve the transfer efficiency. Thus, in this paper, the transfer efficiency of moving position of receiver coil (Rx) coil and consumption of liquid nitrogen were measured at of 100 and 370 kHz with 250 W, respectively. As well as, operating charac-teristics of cooled copper Rx and HTS Rx coil were evaluated un-der 100 and 370 kHz with 250 W, respectively.
Funding Information
  • Basic Science Research Program through the National Research Foundation of Korea
  • Ministry of Education (2017R1D1A1A09081100)

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