Abstract
Novel stator slot permanent magnet (SSPM) machines with doubly salient structure have attractive features, such as a robust rotor and fail-safe capability during faults due to their peculiar PM excitation characteristics. In this paper, average electromagnetic torque production in SSPM machines is investigated using the frozen permeability analysis for the 12/10 stator/rotor pole machine. The single layer (SL) and double layer (DL) winding SSPM machines with 12/10 stator/rotor poles are further investigated, accounting for the influence of stator tooth-tips. The key findings include that the average electromagnetic torque can be enhanced by 9%–10% at the rated current for the DL and SL winding machines with stator tooth-tips. The influence of design parameters, open-circuit characteristics, inductances, electromagnetic torque, torque ripple, and losses is studied. Finally, the 2-D finite-element analysis is experimentally validated.
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