Study on Measurement Method of AC Loss of Armature Winding in Fully Superconducting Generator

最近在研制交流损耗极低的超导导线方面取得的成功，使我们有可能研制出一种由电枢绕组和励磁绕组组成的全超导发电机。然而，由于电枢绕组通常暴露在交流磁场中，电枢绕组交流损耗的评估是全超导发电机中最重要的项目之一，在本研究中，我们主要研究了全超导发电机电枢绕组交流损耗的测量方法。我们制作了两个测量交流损耗的电路。然后，利用液氮冷却的正常导电实验线圈对这些电路进行了测试，并对我们设计的1GVA全超导发电机电枢绕组的稳态交流损耗进行了理论研究。讨论了电机设计参数和运行条件对电枢绕组交流损耗的影响。

Recent success in developing superconductive wire with very low AC loss has been promising us a feasibility of a fully superconducting generator composed of both superconductive field and armature windings. However, since the armature winding is usually exposed to AC field, the evaluation of AC loss on the armature winding is one of the most important items in the fully superconducting generator.In this study, we mainly investigated the measurement method of the AC loss of the armature winding in a fully superconducting generator. We made two circuits for measurement of AC loss. Then, these circuits were tested by using normal-conductive experimental coils, which were cooled by liquid nitrogen.Moreover, we theoretically investigated the steady-state AC loss in the armature winding of an 1GVA fully superconducting generator conceptually designed by us. We discussed the influences of the machine design parameters and the operating conditions on the AC loss of the armature winding.