A High Efficiency Hybrid Synchronous Motor for Electric Vehicle

A new high efficiency and high-speed Hybrid Synchronous motor (HSM) is developed for pure electric vehicle. The HSM employs multi-layer magnet layout with high salient rate and reluctance torque that lead to high safety, efficiency and power density. Based on topological optimization of rotor, the HSM provides high operation safety, by preventing demagnetization during field weakening and reducing back EMF. The HSM is designed to operate at the maximum of 18000 RPM, which increases power density to 4.8 kW/kg, with motor efficiency up to 97.5%, and 92.7% of efficiency map area greater than 85% achieved.