【摘要】 铁基二硼化镁(MgB2/Fe)超导线带材有望在20K—30K、低场下得到广泛应用.本文考虑到铁的磁导率与磁场关系的非线性,结合J-A磁滞回线方程,构建了MgB2/Fe超导带材内超导芯的磁场与外加磁场的关系的模型.通过数字计算,研究了铁基截面尺寸及不同铁基底对外场的影响,计算了影响大小与外加磁场大小的关系.这对于解释MgB2/Fe超导带材的临界电流与外场的关系、进一步分析其应用中的低频交流损耗都将具有一定意义.更多还原

【Abstract】 MgB₂/Fe superconducting material looks promising for large-scale engineering applications at temperature（20K—30K） region and low magnetic field.In this paper,considering that magnetization curve of iron is non-linear,we incorporate the Jiles-Atherton ferromagnetic hysteresis model to construct the mathematical formulations of relation between the applied perpendicular magnetic field on MgB₂/Fe tapes surface and the magnetic field of MgB₂ core.The dependences of the magnetic relations on various cross section dimensions and various type iron-clad materials were digitally calculated based on the derived formulations.It was shown that an iron-clad shielding effect occurs within a certain range of external magnetic field.Our results will be helpful for understanding the effect of magnetic field on critical current of MgB₂/Fe tapes and further analyzing the alternating current losses in MgB₂/Fe tapes.更多还原