The second-generation high-temperature superconducting tapes (2G-HTS) such as the REBCO coated conductors are known for their strong mechanical properties and high current carrying capacity with low ac losses compared with first-generation HTS tapes as well as low-temperature superconductors. Therefore, they seem to be good candidates to assemble coils for superconducting rotating electric machines (SuREMs). In this article, to investigate the influence of a soft magnetic composite (SMC) material on the dc and ac HTS coil performances at cryogenic temperatures, GdBCO- and YBCO-based commercial tapes from different manufactures were used to assemble ten HTS coils in double-pancake configuration. These tapes were wound using two different core structures, i.e., fixed and movable cores, having the same circular shape but different diameters as well as materials, i.e., fiberglass and SMC. Critical currents and ac transport current losses of these coils were measured using the electrical method. To evaluate the parallel and perpendicular components of the profile of magnetic flux density for each assembled HTS coil, a finite element model has been developed using Maxwell 2D. Eventually, the performance of different coils for SuREM application was discussed.

中文翻译：

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用于超导旋转电机应用的 HTS 线圈的表征：挑战、材料选择、绕组工艺和测试

与第一代 HTS 胶带和低温超导体相比，REBCO 涂层导体等第二代高温超导胶带 (2G-HTS) 以其强大的机械性能和高载流能力以及低交流损耗而闻名. 因此，它们似乎是组装超导旋转电机 (SuREM) 线圈的理想选择。在本文中，为了研究软磁复合材料 (SMC) 材料在低温下对直流和交流 HTS 线圈性能的影响，使用来自不同制造商的基于 GdBCO 和 YBCO 的商业胶带组装十个 HTS 线圈双煎饼配置。这些胶带使用两种不同的磁芯结构缠绕，即固定磁芯和活动磁芯，具有相同的圆形但不同的直径以及材料，即玻璃纤维和SMC。使用电气方法测量这些线圈的临界电流和交流传输电流损耗。为了评估每个组装的 HTS 线圈的磁通密度分布的平行和垂直分量，使用 Maxwell 2D 开发了一个有限元模型。最后，讨论了不同线圈在 SuREM 应用中的性能。