Comparative Study of Three-Phase and Dual Three-Phase Machines Considering PWM Effect

Recently, multiphase machines have drawn increased interest due to their inherit high fault-tolerant capability and high power density. With the popularity of vehicle electrification, high power traction drives are gaining more attention and multiphase machines are promising alternatives for the benefit of reducing the power rating of each phase leg. In this paper, a comprehensive comparison of three-phase and dual three-phase interior permanent magnet (IPM) machines is presented, in terms of bar winding design, control algorithm, electromagnetic performance, and fault analysis. In order to accurately predict the motor performance, the impact of pulsewidth modulation (PWM) switching effect is considered for the comparison of torque and motor losses. Short circuit analysis and demagnetization check both for three-phase or dual three-phase configurations are also discussed.