Design of high-speed permanent magnet machines with anisotropic electromagnetic and structural continuum formulations

This paper presents electromagnetic and structural continuum formulations including anisotropic material properties that are then used in the coupled analysis of high-speed permanent magnet machines. The tooth/winding region of the machine is modelled by an anisotropic permeability and effective current density, and composite structural materials such as carbon-fiber epoxy rings are modelled with anisotropic compliances. These formulations are then used in the design of a motor/generator and inertial rim of a flywheel energy storage system. The continuum formulation results compare well with finite element analysis.