Topologies of a Double Stator Flux Switching Motor with Ferrite Magnets

Flux Switching (FS) machines have recently received much attention because of their high torque density and their simple rotor structure. In these machines, the armature coil and excitation system are both mounted on the stator structure, and the rotor lacks any coils, Permanent Magnets (PMs) or cages. One of the drawbacks of the FS machines is employment of large quantity expensive Rare Earth Magnets (REM) in their stator structure. In order to tackle this problem, ferrite PMs can be replaced due to their low price. However, their energy-product is low proposed machine torque density is reduced. Double stator structure is considered to solve this problem. In this machine, as in the conventional FS machines, the rotor pole number has a significant effect on machine performance. Therefore, in this paper, the effect of rotor topologies on the performance of a ferrite-based Double-Stator Flux Switching Permanent Magnet (DSFSPM) machine is investigated. In this regard a DSFSPM is designed with several rotor pole numbers and their generated back-EMF waveform and developed electromagnetic torque are simulated and analyzed by Finite Element Method (FEM).