Electromagnetic Design Considerations on HTS Excited Homopolar Inductor Alternators

Fundamental electromagnetic design aspects of high temperature superconductor excited high-speed homopolar inductor alternators are discussed by means of an equivalent 2D FEM model. The proposed model is applied to an exemplary machine with rated power 120 kW at 30000 rpm and makes use of jump periodic boundary conditions in order to impress the homopolar excitation field. The covered design aspects comprise different stator winding topologies, the magnetisation characteristic of the solid rotor material and the pole count.