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Registered Member #3114
Joined: Sat Aug 14 2010, 08:33AM
Location:
Posts: 608
Arcingnoob wrote ...
Dude wolf. Your video is what inspired me in the first freaking place. I was trying to get results like yours D:
But i 'd make a more powerful secondary.. So just call it.. A improved version.. Also with a bulky transformer as the ZVS input..
Also i see no point why i can't melt ferrite cores from flybacks. cfl toroids and cfl transformers and a pc psu largest transformers google says i can physics says i can Chemistry says i can.
Its some solid iron with certain impurities in my opinion.. And in all matters. I can always give it enough heat to break the intermolecular force to turn it into a liquid then shape it then cool it to return that force. And what i get is supposed to be the same material with it's original properties
Also wolf what did you use as insulation.. I see some kind of tape..
But i was thinking about electrical tape + paper Then put it in oil to soak the paper in it Then put the oily secondary in wax.. So i just get a core with 2 wires coming out lol.. the wax 'd seal the oil inside so the core would stay oily inside
Also at you Did you wind Left right.insulate right left insulate left right right left Or right left insulate take wire to start point then right to left etc..
Arcingnoob wrote ...
Also please give me the full dimensions of the core you used
Awesome thats good to know thanks... Good luck with yours
I used "3m transparency films" Like from wall mart or any other store.
I have used wax paper potted with wax and it worked well, but Polypropylene sheets in oil or potted with wax i think is your best bet.
I wound from left to right, little piece of scotch tape, then a strip of insulation, tape and then another coil going from right to left.
Unfortunately i potted it in wax and sealed it with plastic and it arced on the end of the coil, its not ruined but the wire it so short that its to hard to solder and keep it insulated pretty much dead:(
I am going to make another though with like twice as many turns :0
Core dimensions: 7.5cm long 4.5cm wide 1.5cm thick
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
I today bought about 300 meters or 0.2 mm enamel RED wire
But the guide that was supposed to be with me when we will be trying to melt ferrite. Sadly had a car accident. What a tough luck So i couldn't go there.
So i am stuck with the largest core from my expensive flyback Here are the dimensions IT IS COMPOSED OF 2 U and that is the complete specs of the O 6 Cm long The ferrite is about 1.2 cm thick it is about 3.3 cm wide
The air gap is 4 cm long 1.5 cm wide.
3000 turns. Maybe more with the insulation as follows 120 turns left right
2 layers of electrical tape 2 layers of paper 2 layers of electrical tape
120 turns right left And the process goes on
'd the core be wide enough for 3000 turns
Alsoooo.
I thought of this method to keep the secondary coil oily for insulation's sake I will leave the coil in oil for a hour then once the paper is oily i will get some molten wax And seal the core once and for all And since the wax should seal the core's air. Then the oil should stay trapped inside.. FOREVER MUAHAHA Also vegetable oil or engine oil XD?
Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Arcingnoob wrote ...
Also i see no point why i can't melt ferrite cores from flybacks. cfl toroids and cfl transformers and a pc psu largest transformers google says i can physics says i can Chemistry says i can.
Ferrite cores are manufactured from POWDERED IRON, STUCK TOGETHER WITH GLUE, the reason for this is primarily to stop eddy currents (there are other reasons). If you melt it down, they won't work. Virtually all the power you put in will be lost as eddy currents heat up the core. It may even get hot enough to melt again. You will get virtually no power out. It will work at very low frequencies, but even 50Hz will probably be too high. Cores designed to work at 50-60Hz are usually laminated steel, to reduce eddy currents.
High frequency cores only work at high frequencies because they are made from very small particles stuch together with an insulating glue.
The smaller the particles, the higher the frequency they can handle.
(There are other factors too)
EDIT: Also, the carbon from the glue will turn your ferrite into steel.
Registered Member #3343
Joined: Thu Oct 21 2010, 04:06PM
Location: Toronto
Posts: 311
Arc; It is difficult to understand the dimentions and shape of your ferrite core. Why you do not post a sketch of your ferriite core ?? SOooo the people may help you preciselly.. Cheers !
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Ash Small wrote ...
Ferrite cores are manufactured from POWDERED IRON, STUCK TOGETHER WITH GLUE,
No, thats completely wrong. Soft ferrite is primarily iron(III) oxide, modified with zinc, manganese and or nickel, typically in a spinel structure. Powdered iron cores are a completely different beast.
Don't know how you'll get on trying to melt your cores, I'd expect the melting point to be pretty high, and you may not get ferrite back on cooling.
If you read through that wiki page you will see that fine milling (<2um particles!) and sintering seems to be crucial for good magnetic properties. If melt casting of ferrite were feasible it would be done industrially as it would result in a denser product and potentially higher mu.
Still, I wish you luck with your experiment.
edit: a quick look around the web suggests you will need temperatures in 1300C to 1600C range. Not trivial.
Registered Member #9252
Joined: Fri Jan 04 2013, 06:27AM
Location: Andromeda
Posts: 253
Atlast someone read what i read.
can anyone suggest any thing i can do to get a larger core? I have on CC and i found no one selling. and if i won't get a useable thing after melting. then what?
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Transformer ferrite core , questions
