Work

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

Year: 2025

Type: article

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.

Source: Energies

DOI: 10.3390/en18225973

Authors: Alexandros Sergakis, Nikolaos Gkiolekas, Marios Salinas, Markus Mueller, Konstantinos N. Gyftakis

Institutions: Technical University of Crete, University of Edinburgh

Language: English

Topic: Machine Fault Diagnosis Techniques

Subfield: Control and Systems Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,137

Funder: UK Research and Innovation