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Design and optimization of a new dual-rotor Vernier machine for wind-turbine application

The present study proposed a novel method to design a direct-drive Dual-Rotor PM Vernier generator (DRPMV) for a high-power gearless lightweight wind turbine system. To benefit from the generator inner space, one needs to embed the inner rotor to generate further power. If the prices of magnet, steel, and copper equal $100/kg, $1.5/kg, and $7/kg in USA's market, respectively, the generators production costs meet a value of $425. Indeed, producing inner rotor costs about $7.24/Kg. On the other hand, one-watt power generation charges $0.53. The inner rotor has the annual of production of 7034 kwh with the mean cost per kwh in the USA of around $0.1, while it only imposes an extra charge of $425 on the construction process. Hence, it diminishes the annual costs by %0.39. ANSYS Maxwell 19 was used to optimize all of the parameters and back up them. Accordingly, the 2-D time stepping finite element method (TSFEM) was implemented to evaluate the impacts of geometrical dimensions and configuration of permanent magnets (PMs). All figures are modified by Origin. The inner and outer generators yield around 0.803 and 2.723 KVA power, respectively.