高温超导线圈交流损耗测试研究

Study on measurement of AC loss of HTS coil

超导线圈交流损耗的测量,能为研究超导线圈交流损耗提供重要方法,并对应用中超导线圈的优化提供重要依据。通过测量电流电压得到功率、再对时间积分的方法,来计算交流损耗,实验中可采用电容补偿降低电源功率负荷,电感补偿降低采集信号噪音,调整采样周期进一步提高采集效率和信噪比等方法来进行。将超导单带在88 Hz及小线圈在90 Hz的实验结果,与理论公式、经典锁相放大器测试结果对比,实验结果中交流损耗从小电流到大电流的差别为17%~1%,证明用该方法测量超导线圈交流损耗,准确、合理。

The measurement of the AC loss of the high temperature superconducting coil can provide an important method and an important evidence for the optimization of the superconducting coil in practical applications. The AC loss was calculated by measuring the current and voltage of superconducting coil, the method of capacitor compensation was used to reduce power load of the power supply, and inductance compensation was adopted to reduce the acquisition noise of acquisition signal. By comparing the results of superconducting single band experiment at 88 Hz and small coil experiment at 90 Hz with the theoretical formula and the classical phase-locked amplifier test results, the difference of AC loss from small current to large current is from 17% to 1%, the accuracy and rationality of this method for the measurement of AC loss of superconducting coil were proved.