FEA-Based Design Study of 12-Slot 14-Pole Outer-Rotor Dual Excitation Flux Switching Machine for Direct Drive Electric Vehicle Applications

This paper presents an investigation into feasibilities design of 12-Slot 14-Pole outerrotor dual excitation flux switching machine (ORDEFSM) for direct drive electric vehicle (EV) applications. The stator of the proposed machine consists of iron core made of electromagnetic steels, armature coils, permanent magnet (PM) and field excitation coils (FECs). The FECs in this proposed machine is used as a secondary field mmf source to support the main flux source from PM. Therefore, the proposed machine has extra advantage of variable flux control capability as compared with the conventional flux switching machines (FSMs). The rotor is composed of only stack of iron and hence, it is robust and suitable for high speed operation. The design target for the maximum torque and power density, and the maximum speed are more than 333 Nm, 3.5 kW/kg, and 20,000 r/min, respectively. The results obtained from two-dimensional (2-D) FEA study show that the initial design of the proposed machine has achieved the maximum torque, power density and maximum speed of 244.76 Nm, 3.47 kW/kg, and 20,000 r/min, respectively. Thus, it is expected that the proposed machine potentially to achieve the target performances by implementing optimization process using deterministic optimization method.