I have face a new vibration problem in 1600 kW AC motor which is associated with fan. in this equipment vibration is high in vertical & Axial direction in motor Drive End & Non Drive end vibration is more than 3.5 mm/sec in axial direction whereas horizontal vibration is 0.85 mm/sec. Motor has 8 pole , and that time running rpm is 337.5. Wondering is that we found a peak in vibration signature at 30337.5 cpm and amplitude value is 3.20 mm/sec . also find side band of 6.25Hz (337.5...
If my calculations are correct this time, the high amplitude is at a high frequency: 90x. The sourse of vibration might be related to rotor bars or stator slots. Can you check these specifications from your books? Have you done a shutdown test to observe the effect of cutting the electric power on the vibration? I guess the input from the forum members would more if you can post some vibration plots and more motor details. Regards- Ali M. Al-Shurafa
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