无绝缘高温超导线圈焊锡浸渍的可行性研究

Feasibility study of the impregnation of a non-insulation HTS coil using solder

无绝缘线圈在各种场合中被广泛地应用和研究。为让超导线圈能够应用于高机械强度负载的场合,超导线圈必须有稳定的机械特性。环氧树脂浸渍是保护超导线圈不受机械扰动的一种常用的增强机械稳定性的方法,但传统的环氧树脂是电绝缘的材料,这可能导致无绝缘线圈的匝间电阻(turn-to-turn contact resistance)变大。因此本文提出了一种新型的浸渍方法,利用导电材料焊锡来浸渍,研究了无绝缘(No-insulation)高温超导线圈焊锡浸渍的可行性。本实验制备了两个线圈来进行对比研究,一个是未浸渍的无绝缘线圈,另一个是用焊锡浸渍后的无绝缘线圈。充放电实验和突然放电实验都在77K的液氮下完成;最后基于集中等效电路,分析了焊锡浸渍对无绝缘线圈的特性电阻及时间延时的影响。

Non - insulation （NI） coils are widely studied and used in many situations. To utilize a HTS coil under high me- chanical loads, the HTS tapes must be stabilized mechanically. Epoxy impregnation is a common method to protect the HTS field from mechanical disturbances. Traditional epoxy resins are electrical insulating materials which might cause the turn - to - turn contact resistance of NI coils to increase. Therefore, this paper proposed a new kind of impregnation method using the electrically conductive material of solder, the feasibility of the impregnation of NI high -temperature superconducting （HTS） coils using solder was reported. Two coils were fabricated and tested for comparison. One was NI coil without impregnation and the other was the NI coil impregnated with solder. The charge - discharge and sudden - discharge tests were performed in liquid nitrogen at 77K. The experimental results were analyzed with equivalent circuit analysis.