A Parameter Selection Procedure for an Axial Flux Wind Power Generator

Abstract

Disk electromechanical energy converters are used as generators in wind power plants, microturbines, and electric vehicles. The article discusses a new design of a low-speed disk magnetoelectric three-phase axial flux synchronous machine for distributed power generation, which has improved weight–size parameters. In the proposed wind power generator design, the air gap is reduced due to the removal of all coil-to-coil connections and a concentrated winding with a large winding coefficient is applied. The two-rotor model that is created for this design (150 W, 83 V, 250 min–1) is described, as well as the features of its magnetic circuit and the location of the concentrated winding. The geometrical dimensions of the axial flux synchronous machine determine the inner stator diameter. A technique for balanced selection of the main machine dimensions and the parameters of its winding according to the rated data and the limitations of electromagnetic loads is presented. Comparison of the parameters and characteristics of the new disk design and the cylindrical design with tangential magnetization is carried out using the example of a 40-pole 5-kW synchronous wind generator. The proposed disk design is superior to the cylindrical one in efficiency and demands a smaller material cost. The limitations are the larger outer diameter of the machine and the required large mass of magnets.