Electromagnetic Analysis of Fully Superconducting Synchronous Machines for Future Turbo Electric Propulsion Systems

This paper deals with the electromagnetic design of fully-superconducting machines (FSCMs) using two different kinds of superconducting wires. The field windings in the FSCMs are made of high-temperature superconducting (HTS) wires, which have good J C -B and mechanical characteristics. Also, MgB 2 superconducting wires are used as armature windings on the stator side; the MgB 2 -wire structure is expected to reduce AC losses at the armature winding because of its multi filament structure. The FSCMs will be applied to the future turbo electric engines using liquid hydrogen. We designed the FSCMs via analytical equations and the finite element method (FEM). The results showed that the12-MW FSCMs with the rotation speed of 10000 rpm reached the output density of nearly 50 kW/kg at maximum. Moreover, other designed FSCMs also achieved the output density of around 20 kW/kg. We conclude that the FSCMs can be applied to various types of electrified aircraft propulsion systems.