In this paper, the authors present a comparison between different structures of axial flow electrical machines - dual rotor - surface mounted permanent magnets - yokeless stator and concentric winding. The comparison is made with iso-geometric dimensions (size and weight) and iso-electrical parameters (current and supply voltage) between different slots / poles combinations. The main objective is to classify these structures according to the torque density. A second classification based on electromagnetic performance (losses, power factor, demagnetization risk) is also performed, considering the specification of medium-size electric car. The study is performed using 3D-FEA calculations for better accuracy of the results.
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Butnariu et al. (2024) studied this question.
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