Double stator winding induction generator for wind and hydro applications: 2D-FEM analysis and optimal design

In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary optimal design aspects and FEM analysis of a 3kW, 250 rpm, dual stator winding asynchronous (DSWA) generator. At the first stage the single winding, three phase asynchronous rotor is optimally designed for low speed and low frequency considering the influence of the poles pairs on the main dimensions, weight, active material cost and efficiency. Than, the rated power and cost reduction of the inverter is analyzed considering dual stator winding asynchronous generators in two topologies: with the inverter placed on the excitation windings and with the inverter placed on the main winding. The analytical model used for optimal design and the model of the double stator winding is validated trough finite element method. Finally the proposed solutions are compared with the single winding induction generators.