Simulation of Superconducting Machine With Stacks of Coated Conductors Using Hybrid A-H Formulation

This article consists on the first finite element analysis of quasi-static test of a superconducting machine with stacks of coated conductors arranged spirally around the rotor. The behavior of the machine as a generator is also investigated. Hybrid A-V-H 2D formulation and moving mesh were used as modeling framework. The stacks are represented with the homogenization technique. Quasi-static test is simulated considering a field cooling initial state and the generator simulation, a pulse field magnetization. Current density and magnetic flux density along the stack surface as well as speed and torque results are analyzed. When the machine is not moving, major current density loops are induced in the stack, following the magnetic poles. These loops are deformed by the current density induced by speed differences between stator and rotor. The quasi-static torque does not change with position. The simulation results prove the potential this topology has of operating as a generator. The quasi-static results are in agreement with measurements made with the prototype.