Demagnetization Fault Diagnosis of a PMSG Based on Instantaneous Power Signatures

In this paper a new method for the diagnosis of demagnetization faults in Axial Flux Permanent Magnet Synchronous Generators is presented. Demagnetization fault signatures are identical to eccentric ones, creating difficulties for separation of the different kind of faults. The proposed solution to overcome this problem is to track the fault signatures in the calculated instantaneous power, using a second order Goertzel Transform, combined with the estimation of the permanent magnet flux. The proposed method has been validated through experimental testing under different operating conditions, from which results are demonstrated.