Multi-gapped ferrite

infinia

Member
2005-05-15 9:51 am
SoCal
Pafi I couldn't see the exact link
But "multi gapped" toroid sounds like marketing speak for powdered iron toroids like the ones from Micrometals Inc. and Amidon. The multi gapped is simply non magnetic filler material added to the powdered ferrite to alter the BH curves. Nothing new.
 
But if you cut it with a numerical controlled cutter it should be ok.

I don't know what it is.

Pafi I couldn't see the exact link

I think you can. There is no specific link, it's a picture on the main page of Yageo portal. Look at the attachment!

But "multi gapped" toroid sounds like marketing speak for powdered iron toroids like the ones from Micrometals Inc. and Amidon.

It would be distributed air gap, but I don't search for this. I need MnZn ferrite, for example 3F3, 3C95, and many (at least 4) well defined, rectangular small gaps. Powdered metal has huge loss.
 

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Hi Pafi,

Here you can read about it....


Ferroxcube new products


cheers,

Tamas


I don't know what it is.



I think you can. There is no specific link, it's a picture on the main page of Yageo portal. Look at the attachment!



It would be distributed air gap, but I don't search for this. I need MnZn ferrite, for example 3F3, 3C95, and many (at least 4) well defined, rectangular small gaps. Powdered metal has huge loss.
 

infinia

Member
2005-05-15 9:51 am
SoCal
Structurally any more gaps than one will be problematic for the toroid. Also EMI will radiate worse, ie at each gap. What are the issues with having a larger single gap only?
Maybe there are new lower loss and higher temp powdered iron material mixes that can work, given relief of design constraints rather than smallest size and/or super efficiencies? Have you looked at the cores used on newer PC mother boards?
 
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Structurally any more gaps than one will be problematic for the toroid. Also EMI will radiate worse, ie at each gap.

This is false. With increasing number of gaps the EMI decreases.

What are the issues with having a larger single gap only?

Stronger stray field, wich induces strong eddy current in the wires.

Maybe there are new lower loss and higher temp powdered iron material mixes that can work,

I haven't found anything that is even close. And they are too expensive also.

Have you looked at the cores used on newer PC mother boards?

The requirements for this component are completely different. They work at very high freq, therefore with very low ripple, and they are cooled quite well. My application is the opposit.

Again:

I need ferrite toroid segments. If it is not commercially available, please let the topic to sink!
 
What does it cost? (Probably 10 times more then the ferrites I will machine with it in my whole life.) Can you buy a thin diamond blade for that machine? Who will make a fixing device for every size of toroids? At what cost? And what do you do with the ferrite dust? And will it be fast enough? Won't it break the ferrite instead of cutting? Cutting ferrite requires stable force! A rigid axis can produce very high force fluctuation if a very small excentricity is present!

I need a cost-effective solution, not a bunch of further problems!

And I don't want to produce components! I want to use them!

Sorry, but a half solution is worse then nothing for me.
 

savu

Member
2007-02-07 5:27 pm
Bern
Pafi,

I do not know the answers to you're questions but I have a friend that has a factory in my town that works with CNC machines and so on.

Will it be of any help for you if Give him some toroids to cut and see what is the result?

I only wanted to give you an ideea ...
Don't shoot the messenger :)

regards,
savu
 
I don't know what it is.



I think you can. There is no specific link, it's a picture on the main page of Yageo portal. Look at the attachment!



It would be distributed air gap, but I don't search for this. I need MnZn ferrite, for example 3F3, 3C95, and many (at least 4) well defined, rectangular small gaps. Powdered metal has huge loss.
If you want to have the best and sheap lpf contact me i test all toroidal material and i find the best