Design of a Three-phase Outer Rotor Synchronous Motor for Hybrid Vehicle

Hybrid and electric vehicles have been widely proposed in recent years. Considering the limited capacity of the batteries, the most requirement is designing a motor with high torque density and reasonable efficiency. To enable the motor to operate efficiently, the most operational condition of the vehicle is considered. According to the dominant urban cycle of operation, the electric motor is designed to have optimal performance in this cycle. The outer rotor configuration is adopted to increase the power density of the motor without increasing the electrical loading. A novel outer rotor fractional slot permanent magnet motor with fractional slot winding is introduced and its performance is compared with the Prius 2004 motor a well-known motor. As one of the main challenges of SPM motors is its demagnetization and this is not studied in detail. This paper proposes a comprehensive study of the airgap flux and decreasing the negative effects of harmonics. The proposed motor has 12% more efficiency at rated load compared with the Prius motor.