cleaning stator slot 1

[uhpo]

Hi
I need to rewind a rotor, and after strip all the coils onto the slot there are a lot o nomex paper with varnish, and it´s a hard work to clean...manually... i don´t want to use fire ... so i´m thinking on using some kind of solvent or acid...does somebody guide me or tell me some manufacturer i could contact or reference?

thanks a lot for your time

 

[electricpete]

I'm not personally familiar with them, but there are products marketed for "cold strip" of windings.

For example (note also health warning):

http://www.spsx.com/uploadedFiles/D..._Brownell/Downloads/MR Supplies Catalog-s.pdf

VANGUARD COLD STRIP
Specially formulated to chemically strip electric motor windings.
Submerge stator completely in
cold strip solution. Allow to soak for several
hours to dissolve the varnish. Place 3 inches of water
on top of stripper in tank to prevent evaporation.
Works on most solvent based varnishes and polyester base solventless varnishes. Safe for aluminum frame motors. This product is a known carcinogen and extra care should be taken when using this product. Have adequate ventilation.

Part number VCS-5, VCS-30, VCS-55 for 5-gallon, 30-gallon, 55 gallon

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(2B)+(2B)' ?

 

[Skogsgurra]

Burn ovens, sometimes improvised with a blow-torch, are used to get rid of the organic material prior to removing windings. But beware not to hurt the inter-plate insulation.

Gunnar Englund

http://www.gke.org

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Half full - Half empty? I don't mind. It's what in it that counts.

 

[uhpo]

thanks a lot..... for this useful information

 

[uhpo]

thanks a lot

 

[ScottyUK]

ePete's suggestion sounds like a dichloromethane-based brew based on it being a carcinogen and denser than water. Nasty stuff, and it's one of the few chemicals will attack epoxy as well as the common materials. It is normally diluted with methanol and some gelling agent to make paint-stripper.


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If we learn from our mistakes I'm getting a great education!

 

[starkopete]

Have you considered dry ice blasting? We've had good luck with it cleaning cores that didn't completely clean-up after B.O. process.