Performance Analysis of C-core and E-core Flux-Switching Permanent Magnet Machine With Airfoil-Shaped Rotor

Abstract

The goal of this paper is to investigate the performance of integrated E-core and C-core stator flux-switching permanent magnet machine with airfoil-shaped rotor by analytical equations and finite element analysis (FEA). The integrated flux-switching PM machine with airfoil-shaped rotor can provide electromagnetic torque and accelerate the flow at the same time. The motor mechanical output power is used to rotate and accelerate the flow as well as drive the additional compressor stages to achieve high pressure ratio. The topology of integrated motor-compressor based on E-core and C-core flux-switching permanent magnet machine has fewer magnets, but larger slot area and higher electrical loading compared to conventional flux-switching PM (FSPM) machine at same current density and dimension. Therefore, E-core and C-core machine can provide larger output power and drive more compressor stages to obtain higher pressure ratio with respect to conventional FSPM machine. The designs are compared with a conventional FSPM machine with the airfoil-shaped rotor on electromagnetic and thermodynamic aspects. The number of rotor pole is also analyzed as it has a significant effect on both the electromagnetic and thermodynamic performance of the integrated machine.