超导感应加热器中铁芯结构对线圈特性的影响

The influence of iron core on pancake coils in HTS DC induction heater prototype

设计并制作了高温超导直流感应加热器样机。在液氮温度、自场环境下,分别对有无铁芯的带绝缘双饼线圈进行低温实验,测试其V-I特性曲线,并通过0.25Hz频率下的V-I曲线计算线圈电感。实验结果表明,有铁芯双饼线圈的临界电流值相较无铁芯的低,有铁芯的线圈电感约为无铁芯的6倍。同时还采用仿真软件COMSOL,对感应加热器模型的V-I特性进行了仿真,验证了实验测试的有效性。

In this study,we designed and built a HTS DC induction heater prototype with an iron core,and tested the insulated double pancake coils（ DPCs）. The results show that the critical current of the DPCs with the iron core somewhat is lower than its counterpart without the iron core. The V- I curve of the insulated coil is a standard one of the superconductor. The inductance of the coil with the iron core is about six times of that without the iron core. This paper used COMSOL to simulate the V- I curve of the DPCs,and the model was verified by comparing the results from simulation and experiment.