Permanent magnet structure design of outer rotor radial flux permanent magnet generator for reduction cogging torque with design of experiment

Radial flux permanent magnet generator have higher output voltage and torque capability than axial flux permanent magnet generator. The efficiency is also higher than axial flux permanent magnet due to the lack of rotor windings have high power density and torque per current ratio, but the large cogging torque can be generated. Cogging torque would be the source of acoustic noise and vibration. It reduce very important for initial activation of wind turbine. In this paper, we are designed of outer rotor radial flux permanent magnet generator which is integrated within blade and then the pole arc ratio and magnet structure was designed in order to reduce the cogging toque.