A Comparative study of transport current loss in HTS coils for superconducting wireless power transfer

Abstract

This paper focuses on the transport current loss modelling for HTS coated conductor coils under high-frequency AC current, which is essential when applying superconducting technology in wireless power transfer system (WPT). The pancake coil, spiral coil and solenoid coil designs were proposed, whose study were carried out based on the Finite Element Method in 2D using H-formulation. The transport current loss in each layer for each coil when applying high-frequency AC current were simulated in the FEM platform. The variation of the transport current loss distribution from different layers of the HTS coated conductor according to changing current input was simulated and compared for different operating frequencies. Finally, the frequency and current dependence of the transport current loss in different layers was shown and compared. The simulation demonstrates that the transport current loss in copper layer could be much higher than the transport current loss in the HTS layer at high current and frequency level due to the skin effect. The results also present that the pancake coil design and spiral coil design could be applied to relatively lower frequency WPT application while solenoid coil design can achieve lowest total loss in higher frequency application. These results are essential when designing HTS coils for WPT system.

Spatial Azimuthal Misalignment Characteristics of High-Temperature Superconducting Wireless Power Transmission Systems

“…In recent years, research has been conducted to establish magnetic resonance radio energy transmission systems using high-quality factor superconducting coils as resonant coils, which improves the energy transmission performance of the systems. The research on high-temperature superconducting WPT systems has mainly focused on coil structure design and transmission efficiency [5][6][7][8][9][10]. Ref.…”

“…In Ref. [7], the investigation of the effect of various HTS coil configurations on the transmission performance of WPT systems revealed that flat coil and spiral coil designs can be effectively applied to relatively low-frequency WPT systems. On the other hand, the solenoid coil design can achieve the lowest total loss in WPT system applications operating at higher frequencies.…”

Superconducting pancake coil FEM analysis for very low frequency levitated gravity accelerometers

“…The main technological applications range from superconducting fault current limiter for use in electric power system to wireless power transfer for use in electric vehicle. A plethora of features have been investigated such as transport current and magnetization losses [12,13]; charging, discharging and overcurrent [14][15][16]; turn-to-turn contact resistance [17]; interfacial stress and critical current degradation [18,19]; axial levitation force [20]; bifilar coil and transformer magnetic shield for superconducting fault current limiter [21,22]. Although there are many works on the subject, the study on the nonlinearity of the inductance is scarce.…”