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Thread: cleaning windings
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20th May 2020, 01:04 PM #1Senior Member
- Join Date
- Jul 2010
- Location
- Brisbane
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- 143
cleaning windings
Looking to get an old 1/2 HP motor back in service.. windings are covered in wood dust and oil... what i can see of the windings look OK except for a small patch that has lost its varnish.
the front bush is shot so it will need replacing... are these available ?
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20th May 2020, 02:39 PM #2Member: Blue and white apron brigade
- Join Date
- Feb 2006
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- Perth
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- 7,182
If the patch have really has lost their varnish the motor should not be used.
If you are referring to the shiny copper windings in that photo they look like they are OK and have not lost their varnish (they were probably covered with something that stopped them getting dirty.
************ the following is provided at your own risk ***********************
The right way to check this out is to use a compressor to blow out the loose crap and then use a Megger Tester to check the insulation resistance of the windings.
A paint brush or well used soft toothbrush can be used to loosen the dust.
If you have no Megger at least test the winding insulation using an Ohm meter. The test should be between either ends of the coils to earth. This should be at least 2 MΩ
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21st May 2020, 07:45 AM #3
CRC lectra-clean
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21st May 2020, 11:45 AM #4Member
- Join Date
- Jun 2016
- Location
- Batemans Bay
- Posts
- 75
When I was an apprentice, I was taught to never use compressed air on motor windings. The reasoning was that stuff that could otherwise be removed by hand/brush/vacuum, could easily be forced down into somewhere that it can't be removed from, which could damage the insulation. Secondly, the force of the compressed air itself can physically damage the windings and insulation if it's applied incorrectly.
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