Design of a 3MW Class Outer Rotor Type PMSG for Wind Turbine

Abstract

Direct drive permanent magnet synchronous generator (PMSG) is a becoming popular in the wind power industry for its inherent reliability and higher annual energy yield. In this study, 3MW class outer rotor type PMSG for wind turbine is designed. The generator features 2.6m stator outer radius, 1200mm stator length, 81 pole pairs, 14.0 rated rpm, and 94.2% efficiency. Design and analysis of the generator are carried out using commercial FEM program ANSYS. Various losses are calculated and thermal analysis is carried out to estimate the maximum stator temperature rise. The shear force density reached 42kN/m^2, and the specific torque was 73 kNm/m^3 and these are comparable to the state of art generator in the wind industry.