Spectral Analysis of Misalignment in Machines Using Sideband Components of Broken Rotor Bar, Shorted Turns and Eccentricity
نویسندگان
چکیده
This paper inspects the misaligned motors by using diagnostic medium such as current, flux and instantaneous power signal. Misalignments in machines can cause decrease in efficiency and in the long-run it may cause disastrous failure because of unnecessary vibration, stress on motor & bearings and short-circuiting in stator and rotor windings. The measurements have been performed at full-load to detect the misaligned motors and considered the fault frequencies characteristics of shorted turn, broken rotor bar (BRB) and eccentricity using current, flux and instantaneous power spectrums. Experimental study demonstrates that eccentricity fault frequency components (f1±fr) from the flux spectrum are more helpful for the purpose of detecting misalignment in machines as compared to any other side band components of shorted turn and broken rotor bar fault frequencies of current, flux and instantaneous power signals. Index Term-Misalignment, Shorted turn, broken rotor bar, Eccentricity, Spectrum
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