Motor vibration problems
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There is a 37KW motor. During no-load testing, the axial vibration was 2.1 microns; once the water pump was connected, the axial vibration increased to 8.2 microns. The maintenance staff said that there is nothing wrong with the water pump. I would appreciate some advice from experts – where could the cause of this vibration lie?
Check how centered the coupling is; use a dial indicator attached to the equipment to check this.
It’s probably a problem with the water pump; the concentricity is fine, so the pump’s bearing should be checked.
A 37KW motor is not considered large, but its axial vibration alone is quite significant. Since you are majoring in electrical engineering, start by checking things related to your own field of study. Based on the information you provided, here are a few possible reasons: First, there might be vibration at the shaft end of the motor; check whether the level of vibration is excessive. Second, if the fluctuation value is high, there are two possible reasons: the shaft bends at the extended end or the bearing installation is misaligned. Third, there is no axial clearance in the shafting of the entire motor rotor, which causes the shaft to bend due to compression or thermal expansion.
The runout of the shafts of the motor and pump should be checked; it’s likely that the problem lies here
Inner and outer bearing fit, clearance. Foundation bolts, motor foundation.