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  1. dArsonval

    Slip ring failure of ABB AML 630L6A BAM

    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...
  2. dArsonval

    Slip ring failure of ABB AML 630L6A BAM

    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
  3. dArsonval

    DC 250KW motor Field overheating urgent!

    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...
  4. dArsonval

    Fire in bearing housing with roller bearings.

    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
  5. dArsonval

    3Ph, 1.5HP Inductor Motor Running at Low Speed

    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...
  6. dArsonval

    Carbon Brushes Replacement Standard

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

    Very odd motor windings

    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...
  8. dArsonval

    Eddy Current Drive Issues

    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...
  9. dArsonval

    skewed slots in AC generator´s stator

    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
  10. dArsonval

    VFD Driven Blower Motor Failure

    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
  11. dArsonval

    DC Motor commutator marking

    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...
  12. dArsonval

    Motor Swap

    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...
  13. dArsonval

    10P-1000HP - Shaft Hunting

    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...
  14. dArsonval

    10P-1000HP - Shaft Hunting

    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
  15. dArsonval

    AC repulsion-induction electric motor

    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...
  16. dArsonval

    evaluate core test thermography results

    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...
  17. dArsonval

    Identifying and then modifying 3phase motor windings

    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
  18. dArsonval

    Laser Shaft alignment Pump, gearbox input outputand motor

    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...
  19. dArsonval

    AC 1250kW 6000V 3 phases, Vibration 29 mm/s during the starting time (1-2 sec.) at full load

    What is mounted to the output shaft of the motor? John
  20. dArsonval

    Entergy New Orleans Transmission Tower Collapse and Resulting Blackout

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

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