A new 12/11-pole dual three-phase flux-switching permanent magnet machine

A new dual 3-phase flux-switching permanent magnet (FSPM) machine having 12/11-stator/rotor-pole is proposed and analyzed in this paper. Compared with the conventional 12/11-pole 3-phase FSPM machine, it is analytically deduced that the proposed dual 3-phase machine has better torque characteristics, i.e. higher torque density due to larger distribution factor and smaller torque ripple due to 30 electrical degrees´ phase shift between the two sets of 3-phase windings. Finite-element (FE) results show that the dual 3-phase machine has 12.57% higher torque density and 54.74% smaller torque ripple than its single 3-phase counterpart, verifying the analytical analysis.