Hi vibration problem of AC Motor

[PAP]

Dear all
Anyone can suggest about the problem of high vibration at high frequency (at aout 911 Hz ,Motor 50 HZ , 1000rpm) ,what are the possible causes of this problem ?. In vibration theory ,the cause may come from the stator or rotor defects , so how can we check the internal stator or rotor defect?
Your sincerely
PAP.

 

[PAP]

Dear all
Now I've repaired this motor into satisfactory condition , repair method is to re-VPI this motor and final result the vibration reduced to 3mm/s( peak).
Although this may not as low as other similar motor ,but this show that VPI technic can use to increase mechanical strength in coil of motor.

Regards
PAP

 

[jbartos]

Suggestion: Visit

http://www.coilwindingexpo.com/conferenceprogram.htm

for cited VPI electrical, thermal and mechanical effects on windings.

 

[GusD]

Hi PAP

I was rereading some of the posts and I notice your post telling us about how you solve the Vib problem.
As you mention, the reVPIing the motor ,solve the Vibration problems.Mechanically the VPI would stabilize the coils,bracings and possibly loose laminations.What I can't really understand, is the fact that your previous vibrations did not seem to indicate that you had any of the problems mentioned above.The problem is solved and it is great, but I still think that it might be other elements at play.Like I said, I don't doubt that your VPI would improve the motor electrical integrity as well as mechanical stability.But if the motor was so mechanically unstable you should have seen that on your previous vibrations.

GusD