phase_accurate said:Looks as if noone reads my posts !!!😡
Regards
Charles
Where please?
Pafi said:
So If I have by example 20 turns for coil, it will saturate at 1000/20, so saturation it be around 50 amperes for mine G1W 88S540 core???
http://www.diyaudio.com/forums/showthread.php?postid=1895932#post1895932
If you leave away the term with the airgap data you can use the second formula to calculate the saturation current.
Regards
Charles
If you leave away the term with the airgap data you can use the second formula to calculate the saturation current.
Regards
Charles
phase_accurate said:
I'm not familiar with calculations, I will try to use 2xRM14 seried,10uH each,with 1mm airgap.
So final inductance will be 20uH realised by 2x10uH.
Can you approximate at how many amperes will saturate the 20uH coil?
And if I raise to 2mm airgap too?
Also for 20uH realised on G1W 88S540 R50 core?
The core parameters on penultim page of thread, mine post #169.
DjLeco said:
You will not succeed until you become familiar with calculatios, and building a test fixture to measure the actual saturation behaviour of coils is also recommended.
Eva said:
I will try that, but in need a start point...
Can anyone explains exactly what is all terms in equation described:
Basic equation: L= Al*turns*turns (in nH) ->
turns= suare root of (L/Al)
Current*turns=1000 A (approximately), you must divide it by turns to get the saturation current.
SO:
L (inductance) is resulted from AL (from core parameters) x Turns x Turns, and is measured in nH?
So the formula is simplified:
Incuctance (L) is 2x number of turns x AL?
Where x= multiply, or "Inmultire" in Romanian language.
And AL is taken from material properties?
DjLeco!
Please use '*' as the sign of multiplification! This is the usual form on internet.
10*10=2*10? No!
'turns*turns' in other words: 'square of turns', 'turns^2' or 'turns on second power'.
In the other questions you are right.
I misspelled:
Please use '*' as the sign of multiplification! This is the usual form on internet.
10*10=2*10? No!
'turns*turns' in other words: 'square of turns', 'turns^2' or 'turns on second power'.
In the other questions you are right.
I misspelled:
Pafi said:
Thank you, now I have understand.
Also I was wrong telling turns*turns =2x turns,, sorry about that.
Also I have received mail from seller of mine G1W 88S540 cores, it looks expensive...
From E-mail:
The cores we do not have in stock I have offered the nearest equivalent we have in stock. See attached table for details.
G1-W PRICE (GBP) 14.50 STOCK 10 PCS
G2B-93 PRICE (GBP) 14.74 STOCK 12 PCS
G2B-87 NO STOCK ALTERNATIVE G1A-87 PRICE (GBP) 8.95 STOCK 14 PCS
G2B-83 NO STOCK ALTERNATIVE G1A-83 PRICE (GBP) 9.69 STOCK 15 PCS
G1B-SH PRICE (GBP) 7.95 STOCK 56 PCS
G1-N NO STOCK ALTERNATIVE G8-N PRICE (GBP) 9.90 STOCK 10 PCS
Price are per item (one piece)
Why messing so much with strange manufacturers and materials and ridiculously high prices when you can get cheap T130-2 or T200-2 online (like 4 T130-2 for $5, 50 T130-2 for $50, 3 T200-2 for $12, 15 T200-2 for $55, plus shipping from US). I used to get T184-2 from that store too (which I'm not going to name but is linked in some of my posts), but they seem no longer available.
Eva said:
Hi Eva, beautiful eyes,,, can you tell me on private from where I can buy those cores?
For example the gapped E55 wich I suggested. I buy them in a local shop. International distributors are expensive, so everybody have to find his own special best buy. T184-14 is also better and cheaper, but now I don't know where to buy (I don't use them any more).
Pafi said:
I have some E55 and E65 cores with former too, but without airgap.
I saw one type having just one from the two E's shorter in center(forming airgap) and some with both centers shorted, forming airgap.
So airgap must been between 1 and 2 mm?
Wich is maximum airgap alowable, in mm?
Also , I have some R63 cores(63mm external diameter) ,K2004 and K2006 material from Kaschke manufacturer.
THOSE ARE CORE PARAMETERS (the one in red are mine R63)
An externally hosted image should be here but it was not working when we last tested it.
If I cut it, to make an airgap, it will be suitable?
ORIGINAL INDUCTANCE FOR 10 WINDINGS
An externally hosted image should be here but it was not working when we last tested it.
AIRGAP REALISED, APROX 2mm
An externally hosted image should be here but it was not working when we last tested it.
INDUCTANCE WITH AIRGAP
An externally hosted image should be here but it was not working when we last tested it.
So, what are your opinion, it's ok or not?
I can raise the airgap to aprox 4 mm, but I'm not sure wich is the best airgap dimension...
what a waste, I use that one for car smps!
well depends if they are the same, size sure looks like it is
well depends if they are the same, size sure looks like it is
luka said:
They are exactly I hope, also me too I have used for Car SMPS, around 1,5-2 Kw/core at 30-35 Khz.
So, what's your opinion?
The airgap I have done in less than 1 minute!
So, is enough 2mm, or is better 3mm airgap?
Share to me please!
I repeat, the core is R63 K2004 material from Kaschke, the parameters of core are in first printscreen above, taken from the next PDF.
http://www.kaschke.de/english/pdf/big_ferritecores_0208.pdf
R63 core parameters are on pages 3-4 from PDF.
A gapped toroid is a good idea, I use it too. You need 1.5 cm^3 of air gap approx.
In a bigger core the air gap can be higher too, and it's neccessary for this high power. Many small gaps are better then one big.
Where did you buy this core, for what price?
In a bigger core the air gap can be higher too, and it's neccessary for this high power. Many small gaps are better then one big.
Where did you buy this core, for what price?
Pafi said:
How "Many small gaps" on a toroid core?
I don't understand, can you make a small drawing?
How can I calculate the aprox 1,5 cm^3?
I have from a friend, I paid around 5 euros/one.
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