What do you mean? Small motors are replaced rather than rebuilt. Big motors are rebuilt.
quote: Originally posted by Josh: What do you mean? Small motors are replaced rather than rebuilt. Big motors are rebuilt. Lets say to rewind/rebuild the motor it cost $4500. Motor is 20 years old. A replacement motor is $11,000. Compare the KW's used to see what you are saving by going with a newer more efficient motor. Also to find out how long it will take to pay yourself back on the new purchase. Validation that the right decision is made.
Why not ask the motor vendor to show the benefit to replace the old motor by buying a new one?
quote: Originally posted by Josh: Why not ask the motor vendor to show the benefit to replace the old motor by buying a new one? I did and he did. But I'd like to be able to do this myself for future reference.
Old motor - no capital cost, already depreciated? Just rebuild cost. Any PM costs? How many times rebuild over a period of time say 10 years? New motor - new acquisition cost of 11K. Any rebuild expected over the same period of 10 years? Any PM costs? Any energy savings over 10 years? When is payback? Can use ROI comparison here?
Walter, I have attached some SKF papers about replacement old motor and payback period. Good luck
Attachment: Procena_egikasnosti_motora_.pdf (451 KB)
EASA "Guidelines for Repair or Replace Decisions..." http://www.eemsco.com/Document...pair_Replacement.pdf
US Department of Energy Motor Repair Tech Brief http://www1.eere.energy.gov/ma...ech_brief_motors.pdf