DC and AC Testing of HTS Coils for Magnetoelectric Generator

Application of high-temperature superconductors in electrical machines aims to achieve extremely high specific power. Recent research has shown that the maximum specific power could be obtained when both dc and ac windings are superconducting. This parameter is critically important for the implementation of projects such as electric aircraft. In addition, a systematic approach is important when several devices, for example, an electric machine, a cable, and an electronic converter are developed together. Such a system is currently being manufactured and tested at Moscow Aviation Institute. The main element is the superconducting electric 90 kW generator, with this particular article being devoted to the coils that make up its winding. Nowadays, application of high-temperature superconducting tapes for dc coils is well-known. Different projects demonstrate successful application of them. In order to successfully use ac high-temperature superconductors coils, it is necessary to characterize them in terms of critical current and losses. Results of dc and ac testing of high-temperature superconducting coils are provided in this article.