spectrum for AC motor 200KW?
spectrum for AC motor 200KW?
(OP)
hello all,
I wish you all an HAPPY NEW YEAR
I made one radial measurment on a motor and i found
in velocity spectrum 2 pics : 21,3Hz;4mm/s and 24,9Hz;4mm/s
and
in demodulated spectrum pics: 100,5Hz with 3 harmonics and 941Hz with side bands of 100,5Hz
What could we say ?
THANK YOU
I wish you all an HAPPY NEW YEAR
I made one radial measurment on a motor and i found
in velocity spectrum 2 pics : 21,3Hz;4mm/s and 24,9Hz;4mm/s
and
in demodulated spectrum pics: 100,5Hz with 3 harmonics and 941Hz with side bands of 100,5Hz
What could we say ?
THANK YOU





RE: spectrum for AC motor 200KW?
I tend to think your demod stuff is not a concern (although we usually don't go that high on demod spectrum).
Would be interested to determine whether your two velocity frequencies are non-sync or sidebands around a running speed.
Is it only shaking on one direction (h) or both (h and v)?
Is there axial vibration?
RE: spectrum for AC motor 200KW?
at the end of the motor, there is an hydraulic coupling
As you said, i have to look only on the velocity spectrum.
-So you think that i have to take horizontal radial measurment and axial ?
-but with this data, do you think something looks good or bad in this motor ?
RE: spectrum for AC motor 200KW?
Of even more concern, the frequencies are not yet understood. We need to know the motor speed to help judge the significance of those frequencies. Unless this is a variable speed machine I would have to think those are non-syncronous frequencies frequently associated with rolling bearing defect. Do you have information on the types of bearings?
Two radial measurements 90 degrees apart would be helpful. Often times vertical machines have resonant vibration and it shows up in only one orientation.
RE: spectrum for AC motor 200KW?
RE: spectrum for AC motor 200KW?
RE: spectrum for AC motor 200KW?
ISO limit is 11,2mm/s ?
but constructor tell 3,5mm/s ? (what does it mean, motor only without coupling ? or maximum limit with coupling ?)