Design and Comparison of Direct-Drive Stator-PM Machines for Electric Power Generation

This paper presents three configurations of direct- drive stator permanent magnet generators (SPMGs) as potential candidates for electric power generation. The design principles are discussed with details, while the proposed configurations are analysed by using the finite element method (FEM). In particular, the no-load electromotive forces (EMFs), the steady torques, the cogging torques, the flux densities and the output powers can be analysed thoroughly. Consequently, the quantitative comparisons are concluded among three proposed generators.