Field angle dependence of AC losses in stacked Bi-2223 Ag-sheathed tapes
Field angle dependence of AC losses in stacked Bi-2223 Ag-sheathed tapes
复制标题
堆叠 Bi-2223 Ag 护套带中交流损耗的场角依赖性
DOI：
10.1109/tasc.2003.812410
复制
发表时间：
2003
影响因子：
1.8
通讯作者：
K. Funaki
中科院分区：
文献类型：
--
作者：
Y. Fukuda;K. Toyota;K. Kajikawa;M. Iwakuma;K. Funaki
在将氧化物超导带应用于功率器件时，通常将它们面对面堆叠以形成平行导体以扩大电流容量。准确估计堆叠带中的交流损耗对于超导器件的基本设计非常重要。在本研究中，我们讨论了暴露于外部交流磁场的堆叠 Bi-2223 Ag 护套磁带中交流损耗的角度依赖性。首先，我们使用鞍形拾波线圈测量非绞合 Bi-2223 磁带中的交流损耗。实验结果表明，在横向磁场中观察到的交流损耗（其方向相对于磁带的宽面具有任意角度）可以通过平行场损耗和垂直场损耗的简单求和来很好地再现。接下来，我们将测量的交流损耗与理论损耗进行比较，理论损耗是根据在直流磁场中观察到的短样本的临界电流特性预测的。
In case of applying oxide superconducting tapes to power devices, they are usually stacked face-to-face to form a parallel conductor for the enlargement of current capacity. The accurate estimation of ac losses in the stacked tapes is very important for the basic design of the superconducting devices. In this study, we discuss the angular dependence of the ac losses in the stacked Bi-2223 Ag-sheathed tapes exposed to an external ac magnetic field. First we measure the ac losses in the nontwisted Bi-2223 tapes using a saddle-shaped pickup coil. The experimental results show that the ac losses observed in the transverse magnetic field, whose direction has any angle with respect to the wide face of the tapes, can be well reproduced by a simple summation of the parallel- and perpendicular-field losses. Next we compare the measured ac losses with theoretical ones, which were predicted from the critical current characteristics of a short sample observed in dc magnetic fields.