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.

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The paper presents a new %Dimensional Finite Element Method (2D FEM) analysis of a double sided axial field, permanent magnet excited brushless DC motor. The rotor of the machine is free to move in a direction perpendicular to the axis of the shaft, Computed 2D results are compared with 3D FEM analysis and the new analysis method is shown to give close agreement.

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