不同环境下堆叠导体电磁特性分析

Analysis of electromagnetic characteristics of stacked conductors in different environments

采用H方程法计算交流损耗,在COMSOL Multiphysics有限元仿真软件PDE模块建立堆叠超导带材仿真模型,系统分析导体在自场、外场和复杂电磁环境下电流密度、电磁分布和交流损耗等不同特性。仿真结果显示:磁场主要集中在堆叠导体端部,并逐步向中间渗透,复杂环境下电磁特性变化最为明显。外部磁场从10~100 mT变化时,导体磁场特性展现为从电流占主导到外磁场占主导,出现单边消磁状态。交流损耗随着输入电流幅值的增加而增加,随着电流频率的增大而下降,随着外部磁场强度的增强而增加。

The H equation method was used to calculate the AC loss. A simulation model of stacked superconducting tapes was established in the COMSOL Multiphysics finite element simulation software PDE module. The current density, electromagnetic distribution and AC loss of conductors in the self-field, external field and complex electromagnetic environment were systematically analyzed. The simulation results show that the magnetic field is mainly concentrated at the end of the stacked conductor, and gradually infiltrates into the middle. The electromagnetic characteristics change most obviously in the complex environment. When the external magnetic field changes from 10 to 100 mT, the conductor magnetic field characteristics show from the current dominated to the external magnetic field dominated, with unilateral demagnetization. AC loss increases with the increase of input current amplitude, decreases with the increase of current frequency, and increases with the increase of external magnetic field strength.