Motors Shelf Life 1

[johndavid]

I have motors that have never been used and have been in storage for approximately 15 years and would like to use them. I am looking for information or standards that apply to testing for reliability of these.

 

[edison123]

If they are with anti-friction bearings, open the end bells/end shields, remove the old grease, check bearings and re-grease.

Measure IR and PI values of the windings to start with.

If PI>2, do an ac Hipot at 1.5 times the rated voltage.

If possible, do a surge comparison test.

Do a uncoupled, spin test with reduced or rated voltage.







* The shin is the device to find your furnitures in the dark *

 

[waross]

What horsepower are the motors? For smaller motors you may get by with a megger test. If the megger test is marginal, I would try drying the motors and then re-megger when the motors have cooled down.
I hadn't thought about the grease, but I think that edison123 has a very good suggestion there.
yours

 

[aolalde]

johndavid:

Test the insulation per IEEE Std 43. After 15 years on storage, replace the bearings to prevent expensive trial and error. Unless a storage program including controlled vibration, temperature, humidity and rotation of the shafts quaterly has been implemented.

 

[jraef]

aolalde is correct.
Do a search on the term "false brinelling" (also search with spelling "brinnelling" because a lot of places misspell it) to see the effect of not rotating a shaft on a regular basis.

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