Fully superconducting machines provide the high power density required for future electric aircraft propulsion. However, superconducting windings generate AC losses in AC electrical machine environments. These AC losses are difficult to remove at low temperatures and they add an extra burden to the aircraft cooling system. Due to heavy cooling penalty, AC losses in the HTS stator, is one of the key topics in HTS machine design. In order to evaluate the AC loss of superconducting stator windings in a rotational machine environment, we designed and built a novel axial-flux high temperature superconducting (HTS) machine platform. The AC loss measurement is based on calorimetrically boiling-off liquid nitrogen. Both total AC loss and magnetisation loss in HTS stator are measured in a rotational magnetic field condition. This platform is essential to study ways to minimise AC losses in HTS stator, in order to maximum the efficiency of fully HTS machines.

中文翻译：

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用于电动飞机推进的全超导电机：HTS 定子交流损耗的研究

全超导机器提供未来电动飞机推进所需的高功率密度。然而，超导绕组在交流电机环境中会产生交流损耗。这些交流损耗在低温下很难消除，并且会给飞机冷却系统增加额外的负担。由于严重的冷却惩罚，HTS 定子中的交流损耗是 HTS 机器设计中的关键主题之一。为了评估旋转电机环境中超导定子绕组的交流损耗，我们设计并构建了一种新型轴向磁通高温超导 (HTS) 电机平台。AC 损耗测量基于量热沸腾液氮。HTS 定子中的总交流损耗和磁化损耗都是在旋转磁场条件下测量的。