High speed flux-switching permanent magnet (FSPM) machines have been identified as key technologies for aerospace and hybrid electric vehicle applications. The open slot geometry, high stator flux densities and high operating frequencies result in high variable cross slot leakage and proximity losses within the armature windings. The aim of this study is to reduce AC losses in the armature of a high speed FSPM machine by stranding the conductors. The influence of rotor movement across the slot opening is investigated using 2-D finite element analysis. A simple 1-D analytical model is developed and validated by the finite element analysis to accurately estimate the level of proximity losses and then used to determine the optimal number and diameter of conductors.
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Thomas et al. (2009) studied this question.
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