CHOICE OF DRIVES FOR ELECTRIC VEHICLES - A COMPARISON BETWEEN 2 PERMANENT-MAGNET AC MACHINES

Most motors for electric vehicles are based on the DC machine, neverth eless, the brushless surface mounted permanent magnet AC machine seems to be a good alternative. The authors propose a method of design and a comparison of two types of brushless machine that takes into account the requirements for the propulsion of electric vehicles. Two types o f AC machine are designed taking into account the limitations due to t he limited voltage power supply in terms of the airgap magnetic field shape and the corresponding stator current waveforms. Finally, a very simple analytical optimal design is proposed and verified both by nume rical simulations and prototypes realisation.