OPTIMAL PERFORMANCES OF SINGLE-PHASE FIELD EXCITATION FLUX-SWITCHING MACHINE USING SEGMENTAL ROTOR AND NON-OVERLAP WINDINGS

Field Excitation Flux Switching Machines (FEFSMs) in which, their torque performance generated by the interaction between armature and Field Excitation (FE) coils have been widely designed and developed for various applications. In this regard, FEFSM with the salient rotor is considered the most suitable candidate for high-speed applications because of their advantages of flux controllability, and robust due to a single piece of rotor structure. However, the salient rotor structure is found to produce low torque performance due to the longer flux path in stator and rotor yielding weak flux linkage. In this paper, a new FEFSM using a segmental rotor with advantages of shorter flux path is proposed. The segmental rotor has improved the flux flow and reduced flux leakage to produce higher torque. For comparison, both FEFSMs with salient and segmental rotors have been designed using JMAG Designer version 15 and the investigation process is done via 2D-FEA. As a result, the magnetic flux of the segmental rotor design is 11 times higher than the salient rotor structure mainly due to shorter magnetic flux linkage between two stator teeth and a single rotor segment. In addition, the optimization process of the proposed motor has been conducted by using deterministic optimization technique. The flux linkage, torque and power for the proposed motors have achieved optimum performances of 0.0714 Wb, 1.65 Nm, and 398.6 W, respectively. In conclusion, the proposed motor is considered as the best single-phase FEFSM candidates, with 85.4% and 43.6% improvement of torque and power, respectively.