Investigation of AC Loss in an Impregnated 3-Parallel Strands HTS Coil for a Superconducting Armature of Electrical Machine for Aeronautics

The design of a superconducting armature is currently one of the major challenges for the development of a cryogenic turboelectric chain for aeronautics. To limit the voltage rise in aircraft, HTS coils are designed with parallel strands and must withstand both thermal constraints related to the presence of AC losses and mechanical constraints during operation. In this study, the AC losses of an impregnated 3-parallel strands racetrack double pancake HTS coil were investigated for currents and frequencies ranging from 30 to 150 A and from 40 to 440 Hz, respectively. Experimental results show that despite an overall hysteresis loss behavior, mechanical losses of vibrational origin seem to be part of the loss balance, particularly at low current and high frequency where they appear to be preponderant.