Teflon insulated magnet wire? - diyAudio
Go Back   Home > Forums > Design & Build > Parts

Parts Where to get, and how to make the best bits. PCB's, caps, transformers, etc.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 30th May 2004, 07:07 PM   #1
diyAudio Member
 
serengetiplains's Avatar
 
Join Date: Feb 2004
Location: Canada
Default Teflon insulated magnet wire?

Has anyone any experience with transformers wound with teflon insulated magnet wire? Polypropylene insulated magnet wire? Seems to me either of these dielectrics should render an audible improvement to a transformer (lower capacitance, lower dielectric absorptive effects). Is teflon perhaps too difficult to handle for winding purposes?
  Reply With Quote
Old 30th May 2004, 07:28 PM   #2
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
Has anyone any experience with transformers wound with teflon insulated magnet wire?
No....but then I have a hard time believing such magnet wire even exists...

Cheers,
__________________
Frank
  Reply With Quote
Old 30th May 2004, 07:43 PM   #3
diyAudio Member
 
serengetiplains's Avatar
 
Join Date: Feb 2004
Location: Canada
Default sightings

Quote:
Originally posted by fdegrove
No....but then I have a hard time believe such magnet wire even exists...
Frank, I've researched the issue somewhat. A few wire manufacturers in the USA offer teflon enameling (not sure about polypropylene). I obtained a roll of PTFE enameled silver wire from one such manufacturer, California Fine Wire, and the enameling seems possibly sufficient for tranformer winding. The enamel is somewhat loose on the wire---slips around if you force it---is not too thick from measured specs (don't have them with me at the moment) and was hi-pot tested to 5000VDC (!). I sent an email to Tribute transformers asking their opinion on winding a transformer with this type of material. If you help me communicate with them, I'd be happy to send you some of the silver wire I had manufactured to inspect and test?

  Reply With Quote
Old 30th May 2004, 07:46 PM   #4
diyAudio Member
 
serengetiplains's Avatar
 
Join Date: Feb 2004
Location: Canada
Default Cal Fine Wire URL

Frank, here's an article perhaps of interest:

http://www.calfinewire.com/magazine/ptfe2.pdf
  Reply With Quote
Old 30th May 2004, 07:49 PM   #5
diyAudio Member
 
serengetiplains's Avatar
 
Join Date: Feb 2004
Location: Canada
Default Another

http://www.calfinewire.com/magazine/ptfe.pdf
  Reply With Quote
Old 30th May 2004, 07:54 PM   #6
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
If you help me communicate with them, I'd be happy to send you some of the silver wire I had manufactured to inspect and test?
Sure, no problem.

In the meantime I'll go through the documents...I'm really curious about this as it opens alot of perspectives.

Cheers,
__________________
Frank
  Reply With Quote
Old 30th May 2004, 08:16 PM   #7
diyAudio Member
 
Pjotr's Avatar
 
Join Date: Nov 2002
Location: Netherlands
Quote:
Originally posted by fdegrove
Hi,

No....but then I have a hard time believing such magnet wire even exists...

Cheers, [/B]
Hi,

Iíve used Tefzel isolated wire in switch mode PSUís for commercial purposes on recommendation of the transformer manufacturer. Due to the limited space in a small ferrite transformer it is difficult to comply with regulations for double isolation (4 kV test). The teflon isolation solved that. The wire used was 26 awg, original intended for wire-wrap purposes. Donít think it is of use for regular 50/60 Hz mains transformers. There are other ways to obtain low coupling capacitance between primary and secondary.

If it is for audio trannies, note that the teflon isolation is rather thick. It will waste valuable space in such a trannie (low fill factor). The result is higher copper resistance.

Cheers
  Reply With Quote
Old 30th May 2004, 08:32 PM   #8
diyAudio Senior Member
 
fdegrove's Avatar
 
Join Date: Aug 2002
Location: Belgium
Hi,

Quote:
If it is for audio trannies, note that the teflon isolation is rather thick. It will waste valuable space in such a trannie (low fill factor). The result is higher copper resistance.
That's indeed the major concern if the insulation is regular PTFE as in Tefzel wire.
However if it has the insulation thickness of a coating such as normal enamel then we're talking.

I know AudioNote prefers polyurethane over polyimide (ML?) for both the OPTS and their range of hook-up wire for sonic reasons but maybe they're as unaware of the existence of PTFE enamels as I am.

Cheers,
__________________
Frank
  Reply With Quote
Old 30th May 2004, 08:42 PM   #9
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Cooner Wire sells Teflon enameled wire (quad build) in a variety of gauges and metals. I priced their 30 gauge copper with Teflon (because of the enameling process, the copper doesn't have to be tin or silver plated) and they want $2.75 a foot for 100 feet.

http://www.coonerwire.com/Products/MEW.tml

se
  Reply With Quote
Old 30th May 2004, 08:44 PM   #10
diyAudio Member
 
Steve Eddy's Avatar
 
Join Date: Sep 2002
Location: Sacramento, CA
Quote:
Originally posted by fdegrove
I know AudioNote prefers polyurethane over polyimide (ML?) for both the OPTS and their range of hook-up wire for sonic reasons but maybe they're as unaware of the existence of PTFE enamels as I am.
And maybe they just don't like the sound of Teflon. It's been known to happen among those who don't worship techincal specs.

se
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Winding coil with Teflon insulated wire ? Bernhard Parts 1 1st June 2008 11:25 AM
why does teflon insulated wires need a very expensive wire stripper? jarthel Parts 7 30th April 2007 03:53 AM
For sale: Habia Silver plated teflon insulated copper wire Magura Swap Meet 29 8th December 2004 08:58 PM
Good place for Teflon insulated chassis wire?? Aerosol Parts 3 25th May 2002 08:15 AM


New To Site? Need Help?

All times are GMT. The time now is 05:32 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2