Investigation of Segmented Rotor FEFSSM with Non-Overlap Windings in Various Slot-Pole Configurations

Salient rotor field excitation flux switching synchronous motor (FEFSSM) could be considered as the most feasible candidate in high speed condition owing to their robustness and flux control ability. Nevertheless, the existing FEFSSM utilizes overlapped field excitation coil (FEC) and armature windings, the material cost, motor size and rise of copper loss should be overcome. Besides, deterioration in power and torque densities due to salient structure of rotor weight needs to be improved. In this research, the salient rotor and overlapped windings in conventional FEFSSM are replaced with segmented rotor and non-overlap winding configuration, respectively. Initially, design structures of four FEFSSM topologies i.e., 12S-3P, 12S-6P, 12S-9P and 12S-15P are conducted using 2D finite element analysis (FEA). Then, performances in term of flux linkage, induced voltage, flux enhancement, flux lines and distributions, allowable cogging torque, average torque and maximum power are analyzed. Preliminary results show that the proposed FEFSSM has produced shorter flux path and less copper usage, mainly from the effect of segmental rotor and non-overlap winding. Finally, 12S-6P stator rotor configurations has been selected as the best contenders which deliver the highest flux linkages, peak torque and maximum power of 4.12 mWb, 0.77 Nm and 260 W, respectively