Parameter sensitivity study for optimization of field-excitation flux switching synchronous machine for hybrid electric vehicles

This paper presents parameter sensitivity study and performance analysis of field-excitation flux switching synchronous machine (FEFSSM) for hybrid electric vehicle (HEV) applications. The proposed machine consists of 12 armature slots, 12 field-excitation coil (FEC) slots and 10 rotor poles. All active parts such as armature coil and FEC are located on the stator, while the rotor part consists of only single piece iron. This makes the machine becoming more robust and more suitable to be apply for high speed motor drive system application. The target performances of the motor are a maximum torque of 210Nm, a maximum power of 123kW, a power density of more than 3.5kW/kg, and a maximum speed of 20,000r/min. The deterministic design optimization approach is used to treat several design parameters defined in rotor, armature and FEC slot area until the target performances are achieved. Results based on 2D-FEA show that the final design has successfully achieved the target performances, achieved much higher power density of approximately 4.82kW/kg, and has good rotor mechanical strength at maximum speed compared to existing IPMSM installed on a commercial SUV-HEV.