A new drive system for electric vehicles is presented. An axial flux disc motor is used. The stator of the machine is attached to tlie chassis whilst the rotor directly drives the wheel. This arrangement reduces the unsprung mass compared with a conventional wheel drive and also because of tlie machine geometry permits movement of the wheel as it is perturbed by the road. The motor is modelled using 2D and 3D finite element techniques and estimates are given for the reduction in torque and induced enif when tlie rotor disc and stator are misaligned. Keywords: electric vehicle, drive system, perinanent magnet, disc mottors.

Finite element analysis is used to obtain the non-linear variation of axis and cross-axis fluxlinkages for a dq model of an interior magnet, brushless DC motor (BLDC). The model is used to compare competing designs of the conventional form of BLDC with designs of a novel type that has q-axis flux barriers. It is shiown that the flux-barrier motor will give (i) equal rated performance, and (ii) better over-rating performance.

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