高温超导体指数损耗的有限元数值分析及相关问题讨论  

FINITE ELEMENT METHOD ANALYSIS OF HIGH TEMPERATURE SUPERCONDUCTORS POWER LOSS AND THE RELEVANT PROBLEMS DISCUSSION

作　　者：张泉[1,2] 王秋良[1,2] 赵尚武[1,2] 王春忠[1,2] 

机构地区：[1]中国科学院研究生院 [2]中国科学院电工研究所,北京100190

出　　处：《低温物理学报》2010年第3期235-240,共6页Low Temperature Physical Letters

摘　　要：本文从高温超导体的非线性E～J指数关系式出发,分析了热致磁通蠕动模型下其等效电导率的特性,讨论如何建立针对这种非线性电导率的有限元计算模型,然后分别给出计算交流磁化损耗和传输损耗的二维数值仿真模型,模型针对银基Bi-2223带材,施加相应的边界条件可以计算不同物理条件下的交流损耗.分析此数值模型所得到的带材横截面中电流密度分布特点以及交流损耗热功率的值,并与利用相关解析式得到的结果作对比,证明此二维模型完全适用于分析多种复杂物理条件下超导体的交流损耗问题.This paper begins from the nonlinear E～J power low relationship of high temperature superconductor （HTS）,and analyzes the electric conductivity characteristics under thermally activated flux creep model.It discusses the method of how to build the finite element model（FEM） considering this nonlinear conductivity,then gives a two—dimensional model which can be used to calculate the AC los caused by time dependent transport current or external magnetic field.The model is based on transversal section of Ag/Bi-2223 tape,to calculate AC loss under different physics cases only needs to apply corresponding boundary conditions on the model.We studies the characteristics of current distribution over the tape＇s transversal section and the value of AC loss obtained by this model,and uses the results of related analytical formula as contrast,the results shows that the model is completely suitable for numerical analysis of different complex AC loss problems.

关 键 词：指数损耗 非线性电导率 有限元数值方法 

分 类 号：O511[理学—低温物理]