基于ANSYS的大电流高温超导线圈的环流分析  

Study on circulating current distributions for heavy current HTS windings based on ANSYS

作　　者：施方圆[1] 周羽生[1] 胡鑫[1] 陈佩瑶[1] 杨义[1] 高小刚[1] 

机构地区：[1]长沙理工大学电气与信息工程学院,长沙410004

出　　处：《低温与超导》2011年第12期21-24,共4页Cryogenics and Superconductivity

摘　　要：超导材料由于其零电阻特性,与常导线圈相比较,绕组各支路间漏电抗微小的不平衡将会引起很大的环流。环流的存在使磁场分布更加不均匀,从而影响交流损耗和临界电流。该文采用磁场与电路分析相结合的方法,应用有限元法分析漏磁场并计算电感系数矩阵的基础上得到电路方程,计算双饼超导线圈绕组的支路电流分布,并分析了支路电阻对环流的影响。计算结果表明:超导材料的零电阻特性所引起的环流是相当大的,不容忽略,并且支路电阻越大,支路电流越接近,支路电流趋向均匀,总的电流不平衡度逐渐减小,形成的环流逐渐减小。In high temperature superconducting windings a slight unbalance of the branch inductances of the windings might result in heavy circulating current because of zero resistance of HTS tapes compared with conventional ones. It is proverbial that the circulating current worsens the distribution of leakage magnetic filed and consequently does harm tO the ac loss and critical current in the tapes. In this paper, the influence of the subcircuit electric resistance on the circulating current was studied by the method of combining magnetic field calculation with circuit analysis. The analysis shows that the current caused by zero resistance of HTS tapes cannot be ignored. If the subcircuit electric resistance increases, circulating current will tend to uniformity. Gradually, circulating current caused by unbalance of the branch inductances will decrease in the wake of total current unbalance diminution by degrees.

关 键 词：高温超导线圈绕组 漏磁场 环流 ANSYS软件 

分 类 号：TM406[电气工程—电器]