Harmonic analysis of low stator slot and rotor pole combination FSPM machine topology for high speed

Flux switching permanent magnet (FSPM) machines are innovative brushless machines that have magnets built into the stator instead of the rotor. Numerous studies were performed comparing the operational characteristics of FSPM machines with that of traditional PM machines as well as comparing the various design configurations of FSPM machines within themselves. The available literature is mostly focused on higher pole FSPM machines since low pole machines were found to have large harmonics and produce unbalanced back EMF. Although high pole machines such as 12/10 topology produce balanced response and achieve high torque densities relative to traditional PM machines, the principal difficulty in realizing them arises with the large fundamental frequency and hence large switching frequencies from the power electronic converters.