AC Loss Calculation of Synchronous Generators Made of HTS Superconducting Armature Windings and Permanent Magnet Rotor

International audiencein this study, a novel FEM calculation method based on A-Formulation of Maxwell Equations was proposed to evaluate the transient AC current losses of superconducting generators. The calculations are carried out in 2-Dimensions. The model generator under consideration is a three-phase synchronous generator with a 12-pole and 12-slot rotor made of permanent magnets and the stator windings made of high-temperature superconducting coils. Superconducting coils are wound with 2G HTS coated conductors and the critical current intensity is around 300 A at T = 77 K. Rotor magnets generate magnetic fields in the xy-plane and only current is induced in the z-direction inside the HTS coils. The Loss calculation of the superconducting generator were then repeated with the H-formulation and the A-H Hybrid model. AC loss was calculated for different rotor speeds using all three calculation approaches. The induced current distributions and magnetic field distributions in HTS coils for various time instants for 60 rpm rotor sped are presented