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Old May 20, 2005, 02:53 PM
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Stator insulation


There is a liquid called "tool dip" I think, it is used to plastic coat the metal handles of tools, plyers for example, when this stuff cures it is a firm rubber like surface, one coat is about 1/32 thick not thick enough for a tool, but good enough for our needs. I'm going to get some tool dip and do some testing, I'll follow up with my findings... unless someone else had already done this?

Charlie F
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Old May 20, 2005, 04:10 PM
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Have not tried that stuff in particular, but I have not had good results using anything soft. The wire just mashed through it at the corner.

Good luck,

Kurt
Old May 20, 2005, 04:19 PM
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I had a chance today to examine a 12 pole stator from a drill motor, it was not insulated and the cornors of the slots were lightly ground smooth with a small radius, why wont this work for our needs too, I'm about to try it on a GB 12 tooth stator.
Old May 20, 2005, 05:02 PM
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I haven't used it on a motor as a dip due to obvious drawbacks. It will barely cover the corners where it's most needed, yet it will readily fill the area between the teeth and coat the ends. Less copper, same risk.
Old May 20, 2005, 06:16 PM
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Chamfer the corners.
Old May 31, 2005, 04:19 PM
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Just wrap 2 or 3 turns of teflon pipe threading tape around them. it is thin and very heat resistant. I have used this in motors and transformers for years with no bad results.

Dale
Old May 31, 2005, 06:17 PM
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After trying heat-cured epoxy coatings and quite a few different kinds of tape, the best I've found is this UHMW tape. The link is to leevalley.com, but I think the tape is a 3M product. This tape is very tough!

To use, simply apply two layers of tape to each 'flat side' of the stator, trim around the stator circumference, and then make slits in the tape between the stator teeth. The excess tape folds over into the stator slots when you wind the stator, forming very effective insulation. For the GB stators, chamfering the sharp edges before applying the tape is highly recommended.

Andrew
Old May 31, 2005, 08:30 PM
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Quote:
Originally Posted by dwentz
Just wrap 2 or 3 turns of teflon pipe threading tape around them. it is thin and very heat resistant. I have used this in motors and transformers for years with no bad results.
Dale, teflon is not a good idea, it flows under pressure, see item #7:
https://www.rcgroups.com/forums/showthread.php?t=240993
http://groups.yahoo.com/group/lrk-torquemax/message/153

Vriendelijke groeten Ron van Sommeren
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Old May 31, 2005, 09:20 PM
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It flies? I like it!
Gunkote baked PTFE/Moly. Chamfer the edges with a swiss file, spray it on, bake for an hour. Tough as nails! Just did two 25 mm GB stacks today. Never had it fail.
Old May 31, 2005, 10:30 PM
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Quote:
Originally Posted by Lomcevak
Gunkote baked PTFE/Moly. Chamfer the edges with a swiss file, spray it on, bake for an hour. Tough as nails! Just did two 25 mm GB stacks today. Never had it fail.
http://www.brownells.com/aspx/NS/Sto...20GUN%20FINISH
Old May 31, 2005, 10:44 PM
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Glass and epoxy, baking paper (pictures):
http://www.modellflug-hager.de/lrk.htm
Old May 31, 2005, 11:23 PM
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After many trys to rewind a PJS motor that had been stripped to bare metal and many, many shorts later I was able to rewind it actually twice (decided to go from Y connection to Delta) without a single short.
I used some stuff called Insulating Cambric cloth.
It's a yellow cloth, fairly thin and very flexible and will insulate up to something like 5000 volts.
I cut two circles slightly larger then the front and back of the stator, glued them on with CA, cut slits between the stator teeth and wound it.
I cut off the excess after it's wound.
I've been fying with that motor for a few months now.
If anyone wants some it's available from quite a few sources on the internet.
Old Jun 01, 2005, 12:00 AM
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Quote:
Originally Posted by mgdon
A
I've been fying with that motor for a few months now.
If anyone wants some it's available from quite a few sources on the internet.
Can you post us a link.
Thanks
Bill
Old Jun 02, 2005, 06:23 AM
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3M Cambric tape..


http://products3.3m.com/catalog/us/e...er/output_html

Can be found in smaller quantities too, I think.
Old Jan 21, 2006, 09:58 PM
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I thought I'd post to this older thread rather than opening a new one. Has anyone tried vacuum forming on their stators? I built a very simple vacuum box, and my 1st attempt is shown. Probably 3 stators at once was too much. I used .015 styrene. I've also attached a pic of the simple vacuum box made from a Radio Shack project box. I'll give this a few more tries before I pass judgement on the technique.

Tony Turley


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