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Author Topic: where to source toroid cores?  (Read 15331 times)

Offline walsh350

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where to source toroid cores?
« on: May 09, 2011, 11:51:00 AM »
Does anyone have any advice on where to get hold of large toroid cores?

Say around 4-6"? 

I want to try some experiments with magnetic fields.

I'm thinking about trying to get hold of something with a soft iron core? Any idea how much that might cost? I need three in total.

Should I just use a plastic toroid?

Suggestions and advice appreciated!






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Offline ElectricGoose

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Re: where to source toroid cores?
« Reply #1 on: May 09, 2011, 12:13:36 PM »
Youre pretty vague in your requirements so I guess that means youre unsure yourself.

You wont find that size core and certainly not in 'soft iron' unless you make it yourself.

If youre looking to make a big joule thief or anything that wants efficiency you will need a FERRITE CORE with HIGH PERMEABILITY (8000 - 15000 U).  W class ferrites are 10,000 and H class are 15,000 but the H class are becoming rarer and expensive.  J class is OK too and 5000U.

Here is a link and I have pasted the two biggest cores (3 inches OD) they stock)

http://www.cwsbytemark.com/index.php?main_page=index&cPath=206_221



F-290-W /16,280 /2.9 /1.530 inch/0.500 inch/W/10,000/$30.00

F-337-J/5520/3.375/2.187 inch/0.500 inch/J/5000$25.00


Offline walsh350

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Re: where to source toroid cores?
« Reply #2 on: May 09, 2011, 12:49:36 PM »
Yeah thanks. I'm just trying to create the strongest mag field possible with the limited resources I have. 

Apparently using a permeable core gives a huge increase in potential magnetic flux strength.

This is a brand new hobby of mine so I'm trying to research and learn as I go.  :)






Free Energy | searching for free energy and discussing free energy

Re: where to source toroid cores?
« Reply #2 on: May 09, 2011, 12:49:36 PM »
Sponsored links:




Offline SchubertReijiMaigo

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Re: where to source toroid cores?
« Reply #3 on: May 09, 2011, 01:42:23 PM »
Ohh... You want to experiment also magnetic field with toroid, maybe Heins effect ? Actually I work (in secret, with my one theory) about this effect...

So, I have several suppliers for this...

European region (my location...)

1) Magnetec: (high petremability "Nanoperm" core ) --> µ=30000, µ=100000 etc... http://www.magnetec.de/magnetec.htm

2) AirlinkTransforemer: core etc... for 50-60 Hz application... (Laminated steel) http://www.airlinktransformers.com/

3) HerosTechnology: "Micrometals cores" for RF, ballast application low permeability cores iron powder/ferrite core µ=10 --> 100,200
http://www.herostechnology.co.uk/pages/pages_comp/micrometals.html

USA/Canada:

1) Toroid Corporation of Maryland: 50-60 Hz Power trafos...
http://www.toroid.com

2) CWS Bytemark: RF, Ballast, low permeability toroid µ=10 --> 100,200 etc
http://www.cwsbytemark.com

3) Surplus sales of Nebraska: Toroid, ferrite, trafos, power trafos, electronics and many things...
http://www.surplussales.com

4) For large volume: Micrometals  http://www.micrometals.com
or Magnetics  http://www.mag-inc.com ...

I know actually only those above, hope it helps...

PS: No advertising or affiliation here, this is just some supplier that I know...

Offline walsh350

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Re: where to source toroid cores?
« Reply #4 on: May 09, 2011, 02:28:27 PM »
Thanks for the replies!

Free Energy | searching for free energy and discussing free energy

Re: where to source toroid cores?
« Reply #4 on: May 09, 2011, 02:28:27 PM »
Sponsored links:




Offline casman1969

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Re: where to source toroid cores?
« Reply #5 on: May 09, 2011, 04:27:45 PM »
High permeability such as the "Nanoperm" in 203mm X 2mm thickness is what many, including myself, are looking for. Magnetec will charge me $300.00 for theirs and that's just too steep for me. Anyone here in the states who could find such a torroid would be greatly appreciated.

Offline walsh350

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Re: where to source toroid cores?
« Reply #6 on: May 09, 2011, 04:47:13 PM »
I've heard it mentioned that its possible make your own cores..
Does anyone have any information on this or can someone point me in the right direction?

Obviously I'm willing to accept the overall design will be less efficient by doing this. I don't want to shell out lots of money before I've had a chance to test out my design...

Free Energy | searching for free energy and discussing free energy

Re: where to source toroid cores?
« Reply #6 on: May 09, 2011, 04:47:13 PM »
Sponsored links:




Offline SchubertReijiMaigo

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Re: where to source toroid cores?
« Reply #7 on: May 09, 2011, 11:46:22 PM »
Quote
High permeability such as the "Nanoperm" in 203mm X 2mm thickness is what many, including myself, are looking for. Magnetec will charge me $300.00 for theirs and that's just too steep for me. Anyone here in the states who could find such a torroid would be greatly appreciated.

Unfortunately I don't know "cheap" High permeability toroid...

Metglas, Nanoperm, and high µ low loss core are very expensive in nature...
So, if anyone have cheap "Nanoperm", I'am interested also, but I don't think it exist LOL...

Offline Magluvin

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Re: where to source toroid cores?
« Reply #8 on: May 10, 2011, 02:12:01 AM »
Check out Alibaba.com for cores. Alibaba is like a catalog of Chinese companies from this to that.

Like here is just 1 example

http://fskemaoyuan.en.alibaba.com/product/443082968-212419319/Ferrite_core.html

Looks to have up to 160 mm OD   ;]

There are thousands of companies.  Most will send samples. ;]
Free energy for free. =]

Mags

Free Energy | searching for free energy and discussing free energy

Re: where to source toroid cores?
« Reply #8 on: May 10, 2011, 02:12:01 AM »
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Offline walsh350

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Re: where to source toroid cores?
« Reply #9 on: May 10, 2011, 02:24:12 AM »
Ha, yeah. Registered with Ali earlier. I found one place that does min runs of 10.. asking for samples is kinda cheeky but its all for a good cause ; )

These guys make iron toroids Upto 800mm?!

http://fskemaoyuan.en.alibaba.com/product/451158765-210720609/Toroidal_transformer_iron_core.html

Scroll down on that page and have a look...
« Last Edit: May 10, 2011, 03:10:17 AM by walsh350 »

Offline Magluvin

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Re: where to source toroid cores?
« Reply #10 on: May 10, 2011, 03:52:09 AM »
no,  not cheeky.   lol

Especially in China, they want your business. Dont think of it as a handout. Its a real part of R&D.   Why order 10 or 1000 if they are not working for you. ;]  If it were an electric bike, ehh, samples not available. lol  But cores? 

Try to order samples from different companies. Even if they want you to pay for the sample, at least you wont end up with many that are not good for you. ;] Get several sizes. Find what works.

But at least we have these sources none the less.

Mags

Free Energy | searching for free energy and discussing free energy

Re: where to source toroid cores?
« Reply #10 on: May 10, 2011, 03:52:09 AM »
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Offline walsh350

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Re: where to source toroid cores?
« Reply #11 on: May 10, 2011, 04:00:17 AM »
Yeah, I see your point. Essentially what we are doing is R&D.

Have already mailed a couple of companies with some initial enquiries.

Cheers

Offline quantumtangles

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Re: where to source toroid cores?
« Reply #12 on: May 13, 2011, 01:57:51 AM »
I grabbed a couple of 4 inch circular composite ferrite toroid cores on ebay for about $12 dollars each.

I tried and failed to make torus shapes for my windings from papier mache (this took hours, ruined my bunker and they fell apart when I tried to peel them off the die/mould).

However there are cool videos about making your torus toroids on Youtube, and some interesting winding configurations.

They range from the mundane to the fabulously zany (mark rodin's coils being interesting mathematically in terms of the winding configuration which he calls vortex maths). www.markorodin.com

Offline triffid

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Re: where to source toroid cores?
« Reply #13 on: May 30, 2011, 03:04:06 PM »
I have two ideas for cheap sources of iron.Wire clothes hangers which may be in your closet. second magnetic black sand from the river mixed with a resin that hardens.You have to use a mold to pour the mixture in before it hardens.I had a friend who used black sand and resin.Wire clothes hangers would give you something to work with quickly.I have no data on numbers.Just two ideas on sources of cheap iron for your project.Of course a magnet should stick to your wire hangers.I have seen the magnetic black sand resin mixture after it hardens.A magnet sticks to it just fine. triffid

Offline triffid

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Re: where to source toroid cores?
« Reply #14 on: May 30, 2011, 03:20:00 PM »
If you have done any gold panning you should have seen black sand.Use a magnet to separate the sand that is magnetic from the nonmagnetic black sand.It is about half and half in my experience.triffid

 

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