Comparative Analysis of Novel Fractional Slot Non-overlapping Winding Hybrid Excited Machines Having Different Consequent Pole Rotor Topologies

This paper investigates novel fractional slot nonoverlapping winding hybrid excited (HE) machines with different consequent pole permanent magnet rotors. The HE machines with different rotor configurations are developed to retain the PMs and utilize the flux concentrating effect. They are comprehensively analyzed and compared by finite element (FE) method. The optimal current ratio between the field and armature windings is identified theoretically and the torque improvement ratio by hybrid excitation is demonstrated to show the benefits of the proposed topology. Finally, the prototypes with different rotor configurations are fabricated and tested to validate the analyses.