【摘要】 利用三种临界态模型 (Bean模型、Kim模型和指数模型 ) ,采用比较简单的方法 ,以Bi2 2 2 3高温超导体为例 ,给出了平板状超导体的初始磁化曲线和磁滞回线的解析表达式 .对不同温度和磁场下的磁化强度进行了编程计算 ,对计算结果进行讨论 .利用推导的公式 ,讨论了温度和外加磁场对高温超导体的磁滞损耗的影响 .更多还原

【Abstract】 Three kinds of critical state models, such as Bean’s model, Kim’s model and Power model, are selected to analyze numerically the initial magnetic curve and hysteresis loop of Bi2223 high-T c superconductor, as an example, with a simple method. Programs are made to calculate the magnetization as a function of applied magnetic field and temperature. The results are discussed compare the three kinds of critical state models. The hysteresis losses of superconductors at different temperatures and under different amplitudes of applied magnetic field are studied according to functions derived using these models.更多还原