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Pumpdesigner's comments are something of which to take note. If heat being transferred through the shaft is a significant source of heat or if the motor is located in a very high ambient temperature environment but the starter overloads are not then overload heaters sized from a table are not...

edison123, I have tried to get my hands on those drawings but the manufacturer won't give them up. They're claiming the drawings are proprietary and they don't want to give away their designs. Hmmmm..... I understand that PAM motors have an inherient imbalance in their flux patterns due to...

electricpete, The 1x vibration frequency is at running speed, not synchronous speed. The peak of the spectrum occurs at that frequency and not at the synchronous frequency. thanks for your interest!

edison123, I'll get the stator/rotor slots .... I'll need to lookup the drawings once I'm back in my office. The manufacturer doesn't really have a clue thus far but they claim that the electrical design has been thoroughly reviewed an should be fine. They are reluctant to share the details of...

UKpete, Sorry for my confusion. The primary frequency of vibration at low speed (515RPM) is 8.58 Hz and at high speed (600RPM)is 10.0Hz.

This post is to answer many of the questions that have been asked since the original post. Thank you very much for your interest and suggestions in this matter. I apologize for being so long in answering the questions. Further insights, questions, and comments are welcome. Q: How many...

The freq of the vibration was primarily at 1x of running speed 515 RPM, hence, 515 Hz. This is a 60 Hz machine. The vibration of the machine during coast down was primarily at 1x of running speed but when power was applied the 1x vibration was 2 to 3 times that during the unpowered state...

My organization is working on a problem with a 15,000 HP motor which exhibits two to three times the level of vibration when voltage is applied than when not. The rotor and rotor bearings have been test throughly and they are balanced and true. The vibration levels are very low when the rotor...