The design principle of electric motors and drive systems for electric vehicles

The design principle of electric motors and drive systems for electric vehicles (EVs) is presented. Firstly, according to the EV demands on electric drive systems, the article discusses their effects on the vehicle performances covering acceleration, driving range and so on. Then it presents the design outline based on the experiences of four different EVs. Furthermore, some important design parameters of electric motors are listed and expatriated respectively, more design details are given. To minimise the effect of different driving cycles, a combined reference cycle, incorporating Japan 10.15 mode, US06 and UDDS, is derived for optimization. By employing the dynamic model and performing MATLAB simulation, the research work analyses the function of driving cycle, grade ability, and acceleration on EV electric motor parameters on the plots of torque-speed, and provides the detailed design process and method on how to decide the rated and maximum torque and power parameters. At last, the article presents some considerations for designing drive and control systems, such as control method and strategy, hardware and software EMC design. The conclusion is reached using a design flow chart of the whole design procedure.