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Any time I've ever done that I've ended up with a bunch of small random size pieces. Kinda like powdered iron.
Biggest thing I can find now are T400-2D. Shouldn't need to airgap a 10u core 🙂. But I wonder just how physically large I can go before I run into resonances. Some 2.25 OD MPPs I've used never gave me any grief - but only up to about 50A.
Very nice!
Your gapped core seems to be better choice for lower EMI, than mine.
How did you do that?
I' back!
I'm back.
Today has arrived some Micrometals(USA) cores.
Those 20 are T225-2, and the big one (a sample request) is a 400-2 core.
Hope those will be OK for output coils, I think...
Also I saw the T200-2B, is bigger in volume than T225-2 but it has bigger AL=21,8, instead T225-2 wich have AL=12.
Wich will be the best from those 2?
I'm back.
Today has arrived some Micrometals(USA) cores.
Those 20 are T225-2, and the big one (a sample request) is a 400-2 core.
Hope those will be OK for output coils, I think...
Also I saw the T200-2B, is bigger in volume than T225-2 but it has bigger AL=21,8, instead T225-2 wich have AL=12.
Wich will be the best from those 2?
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Also
Also, winding 12 spires equally on those 2 cores, the inductance value obtained is huge different:
The Genalex core with 12 spires:
The Micrometal core with 12 spires:
So regarding his parameters given in catalog, can anyone aproximate the saturation current of a 30uH inductance on T225-2 Micrometal core?
Also, winding 12 spires equally on those 2 cores, the inductance value obtained is huge different:
The Genalex core with 12 spires:
An externally hosted image should be here but it was not working when we last tested it.
The Micrometal core with 12 spires:
An externally hosted image should be here but it was not working when we last tested it.
So regarding his parameters given in catalog, can anyone aproximate the saturation current of a 30uH inductance on T225-2 Micrometal core?
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Yeah
Yes the T400-2 is 100mm external diameter.
So, anyone tell about difference between T225-2 and T200-2B?
Amd for 30uH inductance on T225-2 core, at how amperes will saturate?
The amp will be a full bridge supplied at 125-150Vdc non simetrical, and will use 2 cores, 1 on each channel (2x30uH) on minimum 2 ohm impedance on 125 Khz triangle .
Yes the T400-2 is 100mm external diameter.
So, anyone tell about difference between T225-2 and T200-2B?
Amd for 30uH inductance on T225-2 core, at how amperes will saturate?
The amp will be a full bridge supplied at 125-150Vdc non simetrical, and will use 2 cores, 1 on each channel (2x30uH) on minimum 2 ohm impedance on 125 Khz triangle .
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DjLeco!
Practically infinite. 🙂 I don't know exactly, but more than 100 A.
2B is better because of the lower wire requirement.
Practically infinite. 🙂 I don't know exactly, but more than 100 A.
2B is better because of the lower wire requirement.
The core with lowest AL is an air core 😀
There always must be an tradeoff. With less wire you will get lower parasitic resistance.
I'm speaking seriously here, I own 20 pieces of Micrometals T225-2 toroids, and I intend to use it, in Output filter coils.
For 30uH, is aproximately 48-50 spires.
My question was WHY, T200-2B, with AL21, is better than T225-2 , wich have AL12?
Because I know the -2 material is the best for classD output coils(the material with lowest AL)...
Waiting for some little explanations, thanks to all wich has contribuite to this thread.
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81bas is (almost) right! Air has even lower permeability, zero core loss, and infinite saturation current, but there are other things to consider also (for example: wire loss).
This is a misunderstanding.
This is a misunderstanding.
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Both inductors, built on these cores (T200-2B or T225-2) at required inductance (30uH) will have the saturation current much higher, than you need (more than 100 amperes, said Pafi). So from these two cores it is better to use the one, where the serial resistance will be lower. So this will be the core, where it is needed to use a smaller piece of wire. So this will be the core with higher AL from these two. 🙂 And this is some kind of tradeoff: getting of a lower saturation current (100 amps instead of 120, freely speaking), to get a smaller serial resistance.
Practically both of these cores are perfect. You can use all of them. 😉
Comparation
Those are the real dimensions of reel and litz.
Comparation was made to an 3mm drill spiral
Price around 200 euros ,all included, delivered exactly at my door (it woked me up from sweet dreams
) , today al 11:30 Bucharest hour.
Check the parameters tabel and share your opinions.
It will be used for Class D Output Coils together with those T225-2 toroids from Micrometals, also for SMPS on trafo winding (ETD59 core) and PFC Core Coil too (T300-66).
Those are the real dimensions of reel and litz.
Comparation was made to an 3mm drill spiral
Price around 200 euros ,all included, delivered exactly at my door (it woked me up from sweet dreams
) , today al 11:30 Bucharest hour.Check the parameters tabel and share your opinions.
It will be used for Class D Output Coils together with those T225-2 toroids from Micrometals, also for SMPS on trafo winding (ETD59 core) and PFC Core Coil too (T300-66).
Attachments
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The
The last cores has arrived!
20 pieces of T200-2B and 50 pieces ot T130-2
The last cores has arrived!
20 pieces of T200-2B and 50 pieces ot T130-2
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
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