Study on Electric and Magnetic Loadings in Fully Superconducting Motor Design

Abstract

This paper provides the relations between the electric loadings and the magnetic loadings, for fully superconducting motor (FSCM) design; the FSCMs used both rare-earth barium copper oxide (REBCO) field windings and MgB2 armature windings. The authors adopted the FSCMs-electromagnetic design under the conditions of changing the electric loadings and the magnetic loadings as well as the rotation speeds with both the genetic algorithm and the finite element method (FEM). The results indicate that the FSCM design adopting the values of 500 kA/m and 0.49 T can provide higher output density like 28 kW/kg, while showing such efficiency and power factor as 95.3 % and 0.7, respectively. On the other hand, another design under the conditions of 250 kA/m and 0.72 T provided the values of 18.2 kW/kg, 96 %, and 0.96, respectively. From these results, the authors suspect that higher electric loading machines might have higher output density with lower efficiency and power factor.