Design Optimization of High-Speed PMSM for Electric Vehicles

In this article, a design methodology applied to the case of high speed permanent magnet machines for electric vehicles is presented. The case of small power urban use vehicles is discussed. After a presentation of the analytical model used, it will be shown that, from a driving cycle, it is possible to formulate analytically the solution that maximizes the power density of the machine. Some design rules will be presented in order to optimize magnetic materials, the frequency conversion and the gear ratio.