Optimal Design of Double Stator Permanent Magnet Motors Used in Electric Vehicle

The purpose of this paper is to propose a novel double stator permanent magnet machine (DSPMM) for in-wheel electric-vehicle situation. At first, the structure of in-wheel machine drive system and DSPMM are introduced which composes of inner stator, outer stator and cup rotor. Then the cooling water circuit are design, based on the inner size and its power. In addition, the proposed structure of rotor and its performance on mechanical property are analyzed in detail. Finally, the results of simulations and experiments, including back EMF, cogging torques, torques and flux density are given to verify the validity of the model.