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This paper deals with a new analytical method for determining the air-gap flux density of salient pole synchronous permanent-magnet (PM) machines including the stator slotting effect. The approach to analyze the air-gap flux density based on the new model is to determine the air-gap magnetomotive force (MMF) and the flux-path permeance function. We determine the flux-path permeance function, which includes the stator slotting effect, by using a simple magnetic reluctance network that takes into account the geometry of the machine and the material characteristics. Using the new model with stator slotting, we calculate the air-gap flux density distribution of different electric machines using finite-element methods to prove the accuracy of the new model.
Dajaku et al. (2010) studied this question.