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Have been looking at the original photo posted by the OP. This is a warranty repair. The failure is hidden from view inside a tube. The end user didn't cause this. The manufacturer of the apparatus needs to explain why their product failed. John Edit: Yes, the connection nut locking devices...

Intriguing Connection Failure. There does not appear to be any means for inspecting the hidden damage. The entire rotating portion of the machine needs to be dismantled. It's a connection problem, not a slip ring failure. John

Agree with Edison, it's a novel and mostly destructive way to remove the field windings. It's understandable however because of the sequence in which the coils must be assembled during the rewinding process. Initial guess to the original problem: Obstructed or lack of cooling air flow. It...

Wait, Wait, wait. What is the purpose of a roller bearing in what appears to be an inline pump? Would love to see a print of this pump. The threaded portion of the shaft suggests a lock nut. John

Considering the post originated on April Fools day... Scrolling the OP's previous forum entries dating back to the early 2000's, it does not seem this post is a joke. "But"....Methods of measurement are highly suspect. It would be revealing to measure some other piece of equipment nearby...

There is no "Standard" related to carbon brush replacement. John

The diagram appears to illustrate a common 4 Pole, Wye Connected, Skip Pole, 2 Circuit winding connection. Leads in the OP's illustration identified as L1, L2, etc are shown outside the diagram suggesting a six lead motor. In this instance, the “L” leads would be connected internally and...

The OP states, "...vertical centrifugal solids handling pumps..." It's unclear to the reader if the Eddy Current units are also mounted vertically. Assuming they are, page 24 in the AT line PDF in the Final Mounting paragraph reads; "...make sure unit is level..." PDF Reference...

If the designer of a machine needs additional circuit length in a smaller space, skewed coils, or rotor bars, provide a means for gaining more circuit resistance. John

Having looked at this post more than a couple / three times, I'm convinced it's the first time I've read a comment, a question or an [idea concept] that simplistically describes what's been going on for a long time. "Isn't there a way to... solve this electrically rather than mechanically? John

Edge burning is a fairly common "text book" D.C. Motor issue. This PDF published directly from a carbon brush manufacturer is authentic: https://www.helwigcarbon.com/wp-content/uploads/2018/07/comm-condition-guide-broch-ta4-hi-res-web.pdf As Gr8blu suggests, the neutral setting likely needs...

This motor could be a collector's item Ha Ha ; ) I can't resist. That's a U.S. Motor that was actually made in the United States! (Have not seen one of those in a long time ; ) For a decade or longer... most of their name plates have been stamped, "U.S. Motors- Made in Mexico" Not a useful...

An electric motor reacts to its power supply, and to its load. If the motor runs fine decoupled, it is not a motor issue. It reads as though the refinery crew may pat their back when they get lucky, and point fingers when, when, when, the luck does not exist. Gotta find the "sweet spot" for...

The black line marked on the shaft... do we know if that line represents the rotor's magnetic center to the stator? Or asked another way... do you know where the shaft belongs when the motor is running decoupled and free to find magnetic center? John

Various types of "repulsion" motors have long been confused with one another. Noting that most saws typically start without a load, this motor would likely serve greater where its high starting torque attribute would be better utilized. Prohibiting debris from saw chips getting into the...

There is no, and there never has been, a "standardized" burnout temperature at 650 degrees F. It does not exist. Burnout temperatures are tweaked all the time depending on what's being burned out. Pete, your thermography imagines look pretty reasonable. Its as you wrote in your original...

It depends on the material integrity or temperature rating of the "plastic" tie. Some wire ties withstand considerable temperatures. Some melt like a candle. John

The photograph showing all three pieces of equipment mounted to a frame weldment suggests that it is not in its final operating location. It somewhat looks like a temporary setup for installation elsewhere. But here's some more to consider: Once the three items are zeroed to dead-on...

What is mounted to the output shaft of the motor? John

Very large tower indeed. Looks like it has two circuits on it.