Design and analysis of an in-runner permanent magnet alternator for low-speed wind turbine

Abstract

The in-runner permanent magnet alternator (PMA) is adequately utilized as a part of wind power generation system specially for its robust and conventional structural configuration. In this research, the execution investigation of an in-runner outspread flux PMA intended for direct driven, extremely low-speed and small capacity wind power system has been examined with numerous modification shave taken into account e.g. changing some mechanical parameters such as use of effective and robust material, fractional slotting per pole, improving the slot fill factor and mounting of the magnets for reduction of cogging torque. The proposed configuration has been analyzed by finite element analysis (FEA) technique keeping in mind the end goal to observe the real time performance with several loss counting and cogging torque calculation. A good slot fill factor improves the thermal condition in the slot of the stator by reducing the copper losses. Considering all the point, an in-runner radial flux permanent magnet alternator (RFPMA) has been achieved with minimum losses and higher efficiency.