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rp181

Wed Aug 20 2008, 08:48PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
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Posts: 1529

so this core is basically useless? I w only going to use it only ~1000W. I meant 50kv after a cw, sorry for not explaining, output, im fine with 5kv.

EDIT: i just rea some articles, it just seems that there are tradeoffs with different caracteristics, but it should work.

Steve Ward

Wed Aug 20 2008, 10:14PM

Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055

Id suggest just buying the right ferrite type transformer core. You wont be able to run powdered iron at a high frequency, so at low frequencies you will need far more turns of wire to keep the core from saturating. Fitting all that wire on there will be quite a challenge, even for 5kV. I dont think that core is nearly big enough for 1kW given that its NOT ferrite.

Sulaiman

Wed Aug 20 2008, 10:39PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

These cores would be GREAT for a CFPR/Royer/Marzilli type of inverter.

Steve Ward

Thu Aug 21 2008, 06:20PM

Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055

These cores would be GREAT for a CFPR/Royer/Marzilli type of inverter.

You mean as the DC choke? :P.

I thought powdered iron sucks hard for hysteresis losses?

Sulaiman

Thu Aug 21 2008, 10:59PM

Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141

I think they're not too bad;
the type 66 material (per the cores above) at 25 kHz and 0.05T (500 Gauss) is about 120 mW/cm3
guessing at 80 cm3 for the above cores that's 10W core loss. (I think that should be ok for this size core)
in return you'd get 2Vrms per turn, (guessing at 1 sq.in. central limb cross-sectional area)
so quite a lot of power can be processed by these cores.
These cores would of course make an excellent dc inductor/choke for a 'royer' too.

rp181

Wed Aug 27 2008, 02:09AM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
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Well, i am getting a U126/91/20 OR a U100/57/25 core set from ferroxcube (not sure which yet). If there is anything wrong with these (i cant find anything) than i can still cancle, there is a 1 week lead time. Estimated power of these? im thinking atleast 2KW (i wont go higher then that)

Dr. Dark Current

Wed Aug 27 2008, 08:07AM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Sulaiman wrote ...

in return you'd get 2Vrms per turn, (guessing at 1 sq.in. central limb cross-sectional area)
so quite a lot of power can be processed by these cores.

2V per turn is not really anything great. Normal flyback cores can be run at ~5V/turn.

rp181 wrote ...

Well, i am getting a U126/91/20 OR a U100/57/25 core set from ferroxcube (not sure which yet). If there is anything wrong with these (i cant find anything) than i can still cancle, there is a 1 week lead time. Estimated power of these? im thinking atleast 2KW (i wont go higher then that)

The power is dependent on how much V/turn you'll run it at and how well you can fill the winding window with copper.
I think the cores could be good up to 4000-6000VA if you wind them properly, but remember that means much less W (<1500W) for a current-limited transformer (arc welder, jacobs ladder etc.)

rp181

Wed Aug 27 2008, 12:16PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

well the U126 core was shipped yesterday from poland. how firm do the cores need to be clamped together (like as in like me pressing the core together, or more force)?I wont be running current limited.

Thanks for the help.

Dr. Dark Current

Wed Aug 27 2008, 12:35PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

rp181 wrote ...

well the U126 core was shipped yesterday from poland. how firm do the cores need to be clamped together (like as in like me pressing the core together, or more force)?I wont be running current limited.

Thanks for the help.

Just firm enough so they dont move when you press on them. Also make sure there's no dirt between the cores to make the gap as small as possible. (assuming bridge drive.)

May I ask what is the intended application? We may then help you to better design the transformer. If it's for a voltage non-current limited supply, the best way do wind your transformer is this: first wind 1/2 primary, insulate, wind your secondary, insulate, and wind the other 1/2 primary. If this is not possible (because of high voltages etc.), wind your primary directly under secondary. The reason for this is to decrease leakage inductance so the output voltage drop under load is minimised.

rp181

Wed Aug 27 2008, 10:30PM

Registered Member #1062 Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529

app. is marx gen possiably, arc drawing, and A 800v secondary for cap charging (full auto coilgun O.O). I was thinking to wind 1/2 the secondary on the side, the other half on the other side (both xV for a 2x potential), and primary on the bottom of one of the halves. I also want easy acess to the primary, so ile probably do your second maethod if my idea is bad.

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