Abstract
In this paper, the torque production mechanisms of integral slot distributed, fractional slot concentrated winding (FSCW) and Vernier permanent magnet synchronous machines (PMSMs) are firstly investigated together from the perspective of magnetic gearing effect. The torque contribution and magnetic gearing effect in eight 12-slot PMSMs with different rotor pole numbers are analysed and compared. The study in this paper not only provides an insight into the torque production mechanism of the electrical machines of different types, but also a unified criterion for comparison between different kinds of PMSMs.
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