Tagged With "1600"

Topic

1600 kW 3 Phase AC motor axial vibration

Mukesh Chandrawanshi ·
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...
Reply

Re: 1600 kW 3 Phase AC motor axial vibration

Shurafa ·
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
Reply

Re: 1600 kW 3 Phase AC motor axial vibration

Ayaz Ahmed ·
Additionally, can you see 1- 2xLF sidebands across this 90x peak. 2- PPF sidebands around 1x and first few harmonics.
×
×
×
×