Design,Analysis And Efficiency Optimization Of Permanent Magnet Synchronous Motors For Electric Vehicles

Electric vehicles(EVs),powered by electric energy,provide a new choice in the field of transportation.Driving motor is the core component of an electric vehicle.Permanent magnet synchronous motors(PMSMs),due to their advantages of high power density,high efficiency and good control characteristics,have become a significant solution for electric vehicles.Reducing the loss of PMSMs and improving their efficiency over a driving cycle,are important technical ways to improve the driving range of EVs.Based on PMSMs for EVs,this paper presented the relationship between vehicle dynamic performance and motor performance index.An interior permanent magnet(IPM)motor for EV was designed according to the performance index.Then,the torque-speed characteristic of the motor was studied,and the torque-speed curve was solved by programming.Next,the influence of motor structure parameters on energy consumption of the motor,and the driving range of the EV,were analyzed based on driving cycles.In addition,a parameter optimization method based on the correlation between the parameter values of constraints and energy consumption,was proposed to optimize the structure parameters of the motor over two different driving cycles Considering the difference of the motor iron consumption caused by the manufacturing process,the difference of the optimization process and results caused by the difference of the iron energy consumption,were also analyzedThe result shows that the IPM motor can satisfy the requirement of vehicle dynamic performance.The program is accurate to calculate the torque-speed characteristic.Besides,the same parameters have different influence oin the energy consumption of the IPM motors over different driving cycles.Also,motors optimized for different driving cycles,are different.For low-speed and high-torque driving cycle,the optimal designs are different due to iron loss consumption difference.