Design and Analysis of Permanent-Magnet Vernier Machine for Direct-Driven Wind Power Generator Considering Pole-Slot Combinations

Abstract Wind power turbines have increasingly attracted attention as a renewable energy source. Gearboxes in wind reduce their efficiency, require periodic maintenance, and result gearbox failure. Consequently, direct-driven generators with high torque density emerged an alternative because they transmit the of turbine directly. Permanent-magnet vernier machines (PMVMs) possess simple robust structure significantly at low speeds. Although various topologies pole-slot combinations PMVMs been considered to enhance performance, studies on fractional-slot distributed-winding (FSDW PMVMs) remain limited compared those concentrated-winding (FSCW PMVMs). In this study, we designed eight models, including permanent magnet synchronous (PMSMs), FSDW, FSCW for generators. Their performances terms density, ripple, losses, factor were verified using finite element analysis. The FSDW PMVM was proposed best model based possibility performance improvement.