Demagnetization Monitoring and Identification in PM Generators With Concentrated Windings During Transient Conditions

Direct drive permanent magnet machines used in renewables typically have high numbers of poles leading to low speeds. This poses a challenge for detection faults during transients, while few periods the operating waveforms can be captured. Moreover, it has been recently shown that and stator coils determine demagnetization harmonic generation mechanism consequently location fault signatures. leads different signatures every machine. Additionally, traditional may not clear spectrograms due rotor speed. Under such conditions, monitoring specific higher harmonics lead reliable identification fault. The authors prove reliably distinguished from other rotor-related faulty conditions with use current. Finally, computed are experimentally verified lab, under transient is achieved this paper, studies double axial flux PM generator as case subject.