非均匀缠绕2G- HTS轨道线圈的局部电磁特性和磁滞损耗
Local electromagnetic properties and hysteresis losses in Non-Uniformly wound 2G-HTS Racetrack Coils
摘要：
一个值得注意的物理依赖性的磁滞损耗与轴向绕组的商业\textcolor{black}{Second Generation High Temperature Superconducting (2G-HTS)}磁带的超导跑道线圈的错位的报告。全面研究了匝间不对准因子对单个匝的局部电磁特性的影响，考虑了六种不同的线圈布置和十个施加的交变传输电流$I_{a}$的振幅，以及实验确定的临界电流密度$J_{c}(B,θ)$的磁角各向异性特性的函数。已经发现，对于中等到低的施加电流$I_{a} \leq 0.6~I_{c0}$，其中$I_{c0}$是各个带的自场临界电流，在极端绕组变形下所产生的滞后损耗可以导致能量损耗的增加高达由完美缠绕的线圈产生的损耗的$25\%$。高层次的网格的考虑已被应用，以获得一个现实的帐户的局部和全局的电磁性能的跑道线圈，…我们的研究结果可以作为一个实际的基准，以确定任何2G-HTS赛道线圈应用的相对损耗，揭示可能的线圈绕组错位可以推断的物理指纹。
英文摘要：
A noteworthy physical dependence of the hysteresis losses with the axial winding misalignment of superconducting racetrack coils made with commercial \textcolor{black}{Second Generation High Temperature Superconducting (2G-HTS)} tapes is reported. A comprehensive study on the influence of the turn-to-turn misalignment factor on the local electromagnetic properties of individual turns, is presented by considering six different coil arrangements and ten amplitudes for the applied alternating transport current, $I_{a}$, together with an experimentally determined function for the magneto-angular anisotropy properties of the critical current density, $J_{c}(B,θ)$, across the superconducting tape. It has been found that for moderate to low applied currents $I_{a} \leq 0.6~I_{c0}$, with $I_{c0}$ the self-field critical current of individual tapes, the resulting hysteretic losses under extreme winding deformations can lead to an increase in the energy losses of up to $25\%$ the losses generated by a perfectly wound coil. High level meshing considerations have been applied in order to get a realistic account of the local and global electromagnetic properties of racetrack coils, .... Our findings can be used as a practical benchmark to determine the relative losses for any 2G-HTS racetrack coil application, unveiling the physical fingerprints that possible coil winding misalignments could infer.
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