Brushless motors for electric and hybrid vehicles

Possible electric and hybrid electric vehicle brushless motor drive concepts are compared concerning power to weight ratio, efficiency and manufacturing costs. The design and development of prototype permanent magnet synchronous and asynchronous motors as well as new developments are shown. FEM analysis and thermal calculations are used. Special control strategies are applied to obtain a wide speed range. Theoretical investigations are confirmed by measurements. Simulations of special conditions, like short circuit and load dump, show the dynamic behaviour of the drive. The optimisation of a complete drive system from mains to wheels shows an essential potential for energy savings which may extend the driving range