Design studies and effect of various rotor pole number of field excitation flux switching motor for hybrid electric vehicle applications

A new structure of field excitation flux switching motor (FEFSM) as an alternative candidate of non-Permanent Magnet (PM) machine for HEV drives is presented in this paper. Design principles and initial performances of the proposed motor at various rotor pole numbers with 12 stator slots are demonstrated. Initially, the coil arrangement tests are examined to validate the operating principle of the motor and to certify the zero rotor position. Furthermore, the profile of flux linkage, induced voltage, cogging torque, torque and power characteristics are observed based on 2D-finite element analysis (FEA). The results obtained show that the appropriate combination of stator slotrotor pole configurations are 12S-10P and 12S-14P which initially provide lowest cogging torque, highest power and torque with sinusoidal back-emf waveforms. Therefore, by further design modification and optimization it is expected that the low cost motor will successfully achieved the target performances.