In wind turbine generating systems, Axial Flux Permanent Magnet Synchronous Generators (AFPMSG) are becoming increasingly popular due to many advantages they offer. Nevertheless, these machines suffer from the so-called cogging torque resulting from the interaction between the permanent magnets and the slotted armature. Not only it causes noise and vibration, this cogging torque affects the selfstart ability of wind turbines at low wind speed. Therefore, the aerodynamic torque •generated by the rotor blades should overcome the cogging torque anytime during the operation otherwise the wind ...