A MODIFIED ANALYTICAL APPROACH IN MODELLING AND DESIGN OF AXIAL-FLUX PERMANENT MAGNET MACHINES

In this paper, a modified analytic approach to the calculation of magnetic field in a slot-less, two-rotor axial-flux permanent magnet machine is presented. The analytic-modelling is based on calculation of scalar and vector magnetic potentials which are produced by the armature windings and the magnets. The magnet and the armature windings are modelled by a magnetization vector and a two-dimensional current sheet, respectively. The effects of the armature reaction and the harmonics of field are also considered. The simulation of magnetic field by the analytic model is compared with that of a two-dimensional finite element analysis. The proposed analytic model predicts the magnetic field within 5% compared to the finite element method. Ultimately, by using the analytic model in a genetic algorithm method, which is a known method in optimization, an optimum design of an axial-flux permanent magnet machine is presented.

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