Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Permeability of transformator cores.
Permeability of transformator cores.
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
Thread Tools Search this Thread
Old 18th February 2003, 03:37 PM   #1
Gunders is offline Gunders  Norway
diyAudio Member
Join Date: Nov 2002
Location: Norway
Default Permeability of transformator cores.

Could somebody help me with this little problem?
I'm just wondering what the permeability of a toroid transformator core is..
I know there are some variation, but I need some realistic numbers to work with.

My plan is to wind a inductor, and I'm going to use a tranformator core as the core for the inductor.
But to calculate the windings I need to know the permeability of the core.
  Reply With Quote
Old 18th February 2003, 04:33 PM   #2
peranders is offline peranders  Sweden
Electrons are yellow and more is better!
diyAudio Member
peranders's Avatar
Join Date: Apr 2002
Location: Göteborg, Sweden
Permeability of transformator cores.
The core is soft iron with a small amount of silicone if I'm not wrong. Take the µr for soft iron, this will be a good start. You could also ask for example www.toroid.se and Mikael Gustafsson. mikael@toroid.se or mikael.gustafsson@toroid.se not sure about the email address though.
/Per-Anders (my first name) or P-A as my friends call me
Group buy: DCT03 DC trap for big toroidal transformers. Sign up for interest HERE. 55 pcb's in order. 49 paid.
  Reply With Quote
Old 18th February 2003, 04:49 PM   #3
tiroth is offline tiroth  United States
diyAudio Member
Join Date: Dec 2001
Location: Pittsburgh, PA, USA
It will depend on the core composition. If you don't know the composition the best way is probably empirical: wind enough turns around the core to some idea of the actual value.
  Reply With Quote
Old 18th February 2003, 05:16 PM   #4
pinkmouse is offline pinkmouse  Europe
diyAudio Moderator
pinkmouse's Avatar
Join Date: Apr 2002
Location: Rotherham, England
Permeability of transformator cores.

I merged your two threads into one, most people here read several areas so you should still get the answers you require

Now, handing back to the intelligent members....
Rick: Oh Cliff / Sometimes it must be difficult not to feel as if / You really are a cliff / when fascists keep trying to push you over it! / Are they the lemmings / Or are you, Cliff? / Or are you Cliff?
  Reply With Quote
Old 18th February 2003, 07:20 PM   #5
Jeff R is offline Jeff R  United States
diyAudio Member
Join Date: Nov 2002
Location: Florida
Typical permeabilities can range from 14 to 550, according to my Magnetics Inc. toroid catalog.

This is a very wide range and is fairly useless information for determining windings. As tiroth said, you may simple need to wind a few turns and see what results.
  Reply With Quote
Old 19th February 2003, 12:52 AM   #6
Circlotron is offline Circlotron  Australia
diyAudio Member
Circlotron's Avatar
Join Date: Jun 2002
Location: Melbourne, Australia
If the inductor is for DC like in a power supply filter then you must have an airgap in the magnetic circuit otherwise it will be practically useless for DC. Fine for AC as in a Xover choke though. Lots of inductance for not much turns = low resistance.
Best-ever T/S parameter spreadsheet.
  Reply With Quote


Permeability of transformator cores.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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Step-Up Transformator Silberlot Swap Meet 0 30th April 2006 01:15 PM
unknown permeability... wind or no? Stocker Parts 13 8th January 2005 03:55 PM
Permeability Anvil Parts 6 21st April 2004 05:09 PM
diy transformator JayV Parts 5 8th July 2003 12:19 AM

New To Site? Need Help?

All times are GMT. The time now is 04:17 PM.

Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 16.67%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio