Alternative Diagnostic Approaches for Various Single-Fault Conditions in Direct-Drive Low-Speed Coreless Permanent Magnet Generators

Alexandros Sergakis, Nikolaos Gkiolekas, Marios Salinas, Markus Mueller and Konstantinos N. Gyftakis ()
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Alexandros Sergakis: School of Electrical and Computer Engineering, Technical University of Crete, 73100 Chania, Greece
Nikolaos Gkiolekas: School of Electrical and Computer Engineering, Technical University of Crete, 73100 Chania, Greece
Marios Salinas: School of Electrical and Computer Engineering, Technical University of Crete, 73100 Chania, Greece
Markus Mueller: School of Engineering, University of Edinburgh, Edinburgh EH9 3FB, UK
Konstantinos N. Gyftakis: School of Electrical and Computer Engineering, Technical University of Crete, 73100 Chania, Greece

Energies, 2025, vol. 18, issue 22, 1-18

Abstract: A finite-element model of the direct-drive coreless permanent-magnet generator is used to simulate faults individually. Each fault case—rotor magnet demagnetization, a stator inter-turn short circuit, static eccentricity, and dynamic eccentricity—is introduced into the finite-element analysis (FEA) model separately, rather than in combination. For each isolated fault scenario, the stator current signals are processed using the Extended Park’s Vector Approach (EPVA) and the electromagnetic torque is examined in the frequency domain. The EPVA spectra and torque harmonics exhibit unique features for each fault type, allowing for clear discrimination among faults. These results demonstrate that modeling and analyzing faults one at a time yields distinct diagnostic signatures.

Keywords: condition monitoring; demagnetization; eccentricity; fault diagnosis; permanent magnet generators; inter-turn short circuit (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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