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Ship brushless-generator shaft misalignment simulation by using a complete mesh-model for machine voltage signature analysis (MVSA)

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5 Author(s)
Bruzzese, C. ; Dept. of Electr. Eng., Univ. of Rome "Sapienza", Rome ; Rossi, A. ; Santini, E. ; Benucci, V.
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In this paper a study about the different effects of static and dynamic rotor eccentricities on the external electric variables of a brushless salient-pole synchronous generator (SG) is presented. Air-gap irreularities and related monitoring techniques for synchronous machines have been studied in the past mainly about large vertical hydro-generators [1], but similar issues have been recently recognized as worthy of attention for on-board ship generators. Static and dynamic rotor eccentricities were simulated in this work, for a medium power ship brushless generator, by using a dynamic model including inductances computed by parametric 3D FEM and MWFA-based analyses of the faulty machine, and taking in account the damping effect of the parallel paths inside the machine. Currently voltage, and no-load e.m.f. sleady-state waveforms were analyzed by FFT. No-load vollage harmonics are sensitive fault indicators, whose harmonic content directly reflects level and type of eccentricity, and which can be used ror diagnostic purposes.

Published in:

Electric Ship Technologies Symposium, 2009. ESTS 2009. IEEE

Date of Conference:

20-22 April 2009