Design features of low speed permanent magnet generator direct driven by wind turbine

In order to achieve a gearless construction for the wind energy conversion system, a low speed multi-pole generator is required, and consequently, the large number of stator slots is needed to construct the multi-pole windings. How to design the multi-pole stator winding using the less number of slots in the limited size of the stator core is a big issue for the low speed generator design. A new winding structure with more poles and less slots is adopted to solve the problem that the number of slots is normally larger than the number of poles for the conventional machine design. This paper introduces the design features of a direct driven permanent magnet wind power generator (DPMWG) with the rated power in the region of 10-50 kW, which can be either grid connected or stand alone to provide AC power to the users