Abstract
This paper deals with the prediction of magnetic fleld distribution and electromagnetic performances of parallel double excitation and spoke-type permanent magnet (PM) motors using simplifled (SM) and exact (EM) analytical models. The simplifled analytical model corresponds to a simplifled geometry of the studied machines where the rotor and stator tooth-tips and the shape of polar pieces are not taken into account. A 2D analytical solution of magnetic fleld distribution is established. It involves solution of Laplace's and Poisson's equations in stator and rotor slots, airgap, buried permanent magnets into rotor slots and non magnetic region under magnets. A comparison between the results issued from the simplifled model with those from exact model (EM) (which represents a more realistic geometry with stator and rotor tooth-tips and the shape of polar pieces) is done to show the accuracy of the simplifled geometry on magnetic fleld distribution and electromagnetic performances (cogging torque, electromagnetic torque, ∞ux linkage, back-EMF, self and mutual inductances). The analytical results are verifled with those issued from flnite element method (FEM).
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