Im investigating a motor with sleve bearings that has high axial vibration during uncoupled test.
I did a waterfall measurement (without tach, Fmax=1000Hz, Lines 400 for it to update fast enogh)
Right after shuting down the machine amplitud decreased 50% and the next practically disapeared.
Im leaning towards electrical faul, but how do you difirentiante from a excentric estator, lose iron or a shorted lamination?
attached the waterfall plots during shutdown and vibration trend of band from 115 to 125Hz.