Numerical analysis of magnetization loss in finite-length multifilamentary YBCO coated conductors
Numerical analysis of magnetization loss in finite-length multifilamentary YBCO coated conductors
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DOI：
10.1109/tasc.2005.848247
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发表时间：
2005-06
影响因子：
1.8
通讯作者：
S. Kasai;N. Amemiya
中科院分区：
文献类型：
--
作者：
S. Kasai;N. Amemiya
在宽度为10 mm的典型YBCO涂层导体中，在垂直的横向磁场中会产生很大的交流损耗。降低交流损耗的方法之一是将YBCO薄膜分成细丝。采用有限元数值电磁分析方法，研究了有限长多芯YBCO涂层导体的交流损耗特性。我们忽略了垂直于导体宽面的电流分量，从而将问题归结为平行于导体宽面的平面上的二维问题。由幂函数E-J关系得到的等效非线性电阻率用来表示灯丝的超导特性。根据YBCO涂层导体中电流分布的时间演化，计算了磁化损耗。根据导体中电流分布的变化，讨论了计算的磁化损耗与频率的关系。为了研究它们对交流损耗特性的影响，改变了导线规格和运行条件。
In typical YBCO coated conductors with a width of 10 mm, a large AC loss is generated in a perpendicular transverse magnetic field. One of the means of reducing the AC loss is to divide the YBCO film into narrow filaments. The AC loss characteristics of multifilamentary YBCO coated conductors having a finite length were studied by numerical electromagnetic analysis using FEM. We neglected the current component perpendicular to the wide face of conductor; thus, the problem to be solved was reduced to a two-dimensional one on a plane parallel to the wide face of the conductor. An equivalent nonlinear resistivity obtained from a power law E-J relation was used to represent the superconducting property of filaments. The magnetization losses were calculated from the temporal evolution of current distribution in YBCO coated conductors. The frequency dependence of the calculated magnetization loss was discussed based on the change in the current distribution in the conductor. The conductor specifications as well as the operating conditions were varied in order to study their influence on AC loss characteristics.