Abstract
The superconducting cable for an electric propulsion system of an airplane was developed using coated conductors (CCs). To lighten the cable-weight, stacked conductors without the center core were employed, leading to the reduction of the diameter and effectively reducing the weight. The cable demonstrated reasonable high <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I<sub>c</sub></i> values for the DC current. Additionally, the cable was revised for loading the AC current. Gaps in the insulators of the craft-papers and spacers were added to separate each phase-conductor. Evaluation of the AC current loading confirmed no degradation at loads greater than 1900 Arms, which is sufficient for a 1 MW propulsion system. A low unit weight of 1.44 kg/kA/m of the cable was achieved. Considering the future goal of a 20 MW system, the performance of the coated conductors was developed to improve the infield values. The long CCs were successfully fabricated by the UTOC-MOD process, which is effective for refining the pinning centers. The pseudo-FFDS cable was confirmed to achieve a high <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">I<sub>c</sub></i> value of 304 A/cm-w at 70 K under 2.5 T. Finally, a light unit weight of 0.35 kg/kA/m for the future cable concept was proposed from the weight analysis.
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