HIGH SHEAR-STRESS DENSITY TRANSVERSE-FLUX MACHINE FOR LARGE DIRECT-DRIVEN WIND TURBINES, AND ELECTRIC SHIP PROPULSION SYSTEMS

This paper discusses a work on the high shear-stress density, high number of poles transverse-flux machine, for wind power generation, and electric ship propulsion systems. The main goal of this work is to design a transverse-flux machine with comparably high shear-stress density, high power factor, low cogging torque, low THD of induced voltage, and high power to mass ratio. Two configurations of the the transverse-flux machine, radial-and disk-type are investigated. Electro-magnetic characteristics of the machine such as cogging torque and induced voltage are calculated using 3D FEM software. Based on the results, the machine with the best trade off point between cogging torque and induced voltage is selected for further analysis. A parametric analysis of this machine with different number of poles at constant air-gap diameter is then performed to find the optimal configuration of the machine. The output power and power factor characteristics at different load conditions are calculated using the equivalent circuit of the machine. The results from the 3D FEM and circuit models led to the conclusions on the optimal configuration of the machine, and the future scope of study.