Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 58, Issue 5, Pages 1606-1624Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2010.2087296
Keywords
Fault diagnosis; machine voltage analysis; rotor current analysis; rotor eccentricities; synchronous generator (SG)
Categories
Funding
- Italian Ministry of Defense-General Direction of Navy Armaments (NAVARM) [Rep. N. 19711]
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This paper shows that a static eccentricity makes rise a double fundamental frequency ripple in the rotor current of salient-pole synchronous machines. This ripple leads, under conditions ruled by the stator windings, to precise signatures in the no-load voltage spectrum. Both rotor current ripple and voltage harmonics can be used for diagnosis. The fault-related voltage harmonics are theoretically previewed in this paper through analysis of the windings. Simulations performed by using the winding function approach confirm the theoretical predictions. A four-pole 15-kVA generator was used for experiments, featuring an innovative flange with exact and easy regulation of mixed-type eccentricities. Rotor current monitoring has advantages of single-sensor measure and accentuate fault sensitivity. Experiments also showed an additional rotor-rotation frequency ripple in the rotor current, in case of mixed-type fault.
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