A Study of Static Angular and Axis Eccentricity in a Double-Sided Rotor AFPM Generator using 3D-FEM

This paper investigates the static angular and the static axis eccentricity faults in an Axial Flux Permanent Magnet (AFPM) Synchronous Generator using 3D-FEM. The machine has been constructed in the laboratory and it has a double-sided rotor and a coreless stator. The phase EMF waveforms, the corresponding spectra and the spectra of the stator current are investigated for the faulty cases. In addition, the spectrum of the phase EMF sum (Vs) is studied for fault diagnosis purposes. The novelty of the paper is that the Vs spectrum has not been used previously for fault identification in AFPM machines, as well as the stator current spectrum has not been analyzed before for a double-sided rotor, coreless stator topology with static axis eccentricity fault.