Experimental and 3D Finite Element Analysis of a Slotless Air-cored Axial Flux PMSG for Wind Turbine Application

This research work presents 3D FEM analysis and experimental test of an air-cored axial flux permanent magnetic synchronous generator for low speed, direct drive applications. The structure consists of double rotor and coreless stator. The presented topology results in the absence of core losses, reduction of stator weight and elimination of cogging torque. The flux leakage is reduced with proper rotor design of the proposed structure. In addition, the generator output voltage is improved and it becomes nearly sinusoidal waveform. The generator performance is confirmed by implementation analytical and three-dimensional finite-element numerical methods. The simulations results of the proposed generator coincide very well with the experimental results on a prototype system realized in the laboratory.