This paper compares two flux-switching machines, namely, one stator permanent-magnet flux-switching (SPM-FS) machine and one rotor permanent-magnet flux-switching (RPM-FS) machine, with the same overall dimensions, main material properties and current density. The characteristics comparison is conducted from two perspectives, i.e. electromagnetic torque production mechanisms and torque (power)-sizing equations. The harmonics contribution to average electromagnetic torque is analyzed based on the modulation principle and gearing effect, which reflects the similarities and differences between two FS machines in torque production mechanism. Moreover, torque performances are investigated from the viewpoints of magnetic parameters and electrical parameters. Then, electromagnetic performances including overload capability, flux-weakening capacity, and efficiency are analyzed and compared further. The predicted results indicate the RPM-FS machine exhibits larger torque capability, lower torque ripple, and improved flux-weakening capacity. The finite element analysis (FEA) predicted results are validated by experiments on two prototype machines.
- flux switching
- permanent magnet machine
- Rotor permanent magnet
- stator permanent magnet
ASJC Scopus subject areas
- Control and Systems Engineering
- Electrical and Electronic Engineering