Loss characteristics of HTS coated conductors in field windings of electric aircraft propulsion motors

导电体 电磁线圈 导线 材料科学 磁场 超导电性 推进 铜损耗 核磁共振 电流密度 交流电 电压 电气工程 凝聚态物理 物理 复合材料 航空航天工程 工程类 量子力学
作者
Kevin Kails,Hongye Zhang,Markus Mueller,Quan Li
出处
期刊:Superconductor Science and Technology [IOP Publishing]
卷期号:33 (6): 064006-064006 被引量:23
标识
DOI:10.1088/1361-6668/ab89ed
摘要

Abstract High-temperature superconducting (HTS) coated conductors (CCs) are widely regarded as a promising candidate to enable very high power density motors. These machines operate at high rotational speeds, with some designs going up to 12 000 rpm. HTS CCs are applied to the field windings of these motors to increase the magnetic loading and hence the power density. Even though the superconducting field windings operate with a DC current, due to the magnetic field environment, losses are present. This paper examines the dynamic and total loss characteristics of YBCO-coated conductors in the frequency range relevant to high-speed motors for electric aircraft propulsion. A multi-layer model was created using the H -formulation and the losses for each layer were highlighted. For the first time, it was shown that the DC transport current region in the HTS layer shrinks as the frequency of the applied field increases due to the increased magnetisation current around the edges of the CC, which reduces the dynamic loss per cycle as the frequency increases. To fully understand the loss distribution in the HTS CC, the total loss in the conductor was investigated. For an applied magnetic field of 100 mT and 800 Hz, more than 30% of the total loss occurs in the copper layer due to the decreased penetration depth of the magnetic field and the skin effect. Results show that to accurately model and understand the losses in superconducting field windings, a multi-layer model should be used, since a significant proportion of loss shifts towards the copper stabilizers. Over all, it was shown that both the dynamic loss as well as magnetisation loss play a crucial role in the estimation of the loss in superconducting field windings.
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