This book describes a motor-converter systemic design methodology improving electric vehicles performances (EVP) such as: autonomy, power to weight ratio and ripple torque. This methodology takes in account of several physical, thermal and technological constraints. It rests on the coupling of a parameterized analytical model of the all motor-converter to a software based on genetic algorithms method in order to optimize parameters influencing the EVP on circulation mission in respecting several physical and technological constraints of electric vehicles. The analytical model developed covering several motor configurations is validated by the finite elements and experimental methods.