A two-dimensional analytical method for predicting the magnetic field in the airgap/magnet region of a permanent magnet (PM) disc-type machine is presented. The solutions of the governing field equations are given in both Cartesian and cylindrical coordinates. The expressions derived in this paper can be used con- veniently for optimal design of machine. The computed results using the proposed 2D analytical method are validated by the more accurate, though a lot more complicated, 3D finite element analyses.
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