DIY CNC electromagnet For the first time, make a video. Will improve the effect later! Machining centre electromagnetic suckers made from three microwave ovens transformers！ Power 12V current 3~6 A
It works well but it’s way over engineered. I’ve made a lot of these so I’m posting this information to help others. No disrespect meant. Three welds on each side and four on the bottom of the core was an unnecessary waste and actually made your magnet less efficient. Any welding of the laminated core should be kept to the absolute minimum as transformers use laminate metal pieces to reduce eddy currents that build up heat in the core which wastes power and reduces efficiency. That’s why the original welds are just enough to hold the laminates together. If you take more care removing the copper coils using a press you don’t need any welding as the core will stay in one piece. Welding the cores to the base is again a waste of time and effort and again interferes with the magnet’s performance. A drop of super glue to hold the cores in place is more than enough. Adding chopped mat fibreglass is unnecessary as the resin is more than strong enough. I add a thermal switch to the centre core to shut the power of if it gets too hot. Most microwave ovens have two of these so you can grab those as well when getting the transformer. An indicator light is also a good idea so you don’t leave it on when your finished. I’ve also added an original manual microwave timer ⏲ for one I made for a drill press so even if I do forget I can hear the ticking or it shuts off automatically when the timer goes off. None of this is rocket science and if using 12-24 volts is very safe and most of the parts are free. I hope this helps, cheers Stuart 🇦🇺
Did the switch on off work? If not what was the problem? Can you use just cables in resin and on off switch on outside 24v at 10 amps? Or 240 at 1 amp. What'd be too hot as saw different types and best voltage for 3 of these in series? Or 2 as 3 is bit too much but have 3 exact models that's meant to be good?. 12 volts 10 /20 amp or big 240 plug and full mains power to them in series?
much room for improvement, yes. A very interesting item to build which , appears to be reasonably sound in your effort. Does more coils not equal more strength of the magnetic response to a current? I give you the thumbs up, for the effort . I will be doing a lot of research and then try to build a very strong and dependable version.
You should not weld the transformer cores. Have you ever wondered why they are laminated (and insulated)? It is done to reduce the formation of eddy currents inside the core and reduce the losses and the heat created in the core.
Transformatori od mikrotalasnih pećnica su uglavnom zavareni u fabrici. Prilikom rastavljanja transformatora, brusio je var da bi rastavio transfomator.
Have you tried a higher voltage? Also is the power supply current limited, or is that just what it draws naturally? Are you using a battery or a plug in power supply? I'd be interested in testing this to see how much weight it can hold and then doing it with a variable power supply. on another note, I wonder what would happen if you used the high voltage side and connected it to rectified 120vac (which would be about 170vdc). I'm guessing it would work the same, IDK if magnetism has more to do with current or wattage.
Wait, by wielding the E-core are you not getting rid of the entire reason the core is laminated sheets? Does this not induce eddy currents in your setup? Or is this only in AC?
Is there more strength if chopped down to primary coil or putting smaller slits on the top and pushing primary up so more surface area. Or cutting them down to primary coil height so it very low? Less steel? Air gaps? Asked previously but no school teachers or electromagnet workers answered! Best way to get most magnetic power from mot? Cut in half to primary? Leave and push primary to top with 2/3 mm cuts in i bar for surface area or take off i use as is? Someone must be knowledgeable about this!
You need to retain the primary coil, the one connected to the mains supply, the secondary coil is the one that is used for the hv supply for the magnetron...
@@johnrudd9550 I asked my question in a manner in which I was hoping you would receive an answer it back to me in baby talk... as I do not understand which is the primary and whatever else you were saying. 1 coil is made from small wire and one coil is made from Big wire... which one do I keep the one made from the thick wire or the one made from the thin wire.....?
Hello. I used 12 volts and 12.5 currents. It got too hot after 20 minutes of operation. If I lower the current value, would I use it longer? Will I experience a decrease in my usage power? How much current should I use at most?
Bueno, esos transformadores de hornos micro-hondas, pra hacer un electroiman de potencia, tiene varias apricacones, en un modesto taller, aqui para levantar peso.
I hope that this build gave you what you wanted... but I would not recommend welding the laminated steel core (like you did multiple times).. you see there is a reason that laminated steel is used.... the lamination allows the magnetic flux to travel better.. so you get a stronger electro magnet.....
how many gauss,maxwell ,,,,or even Oersted's can help ,,,I need per square cm to left 1 kilogram ? ,give me the answer please,,, i need that to give to my student's on a science projects ,,i know the formulas but i"m to lazy to deal with math now ,
I was thinking that the transformer cores could be cut down a bit less than halfway in order to make a shorter profile and not use up valuable operating space.
I truely love the informational/instructional videos on RU-vid. THIS MAKES UP FOR THE FAILURE OF THE US EDUCATION'S INEPTITUDE AND LACK OF USEFUL INSTRUCTION/EDUCATION....
QUERIDO, MT GRATO E PARABÉNS! ME TIRE UMA DÚVIDA POR GENTILEZA... TENHO ALGUNS TRAFOS DE MICROONDAS, UNS RECEBEM A CARGA DE 12V E MANTEM O MAGNETISMO... OUTRAS RECEBEM A CARGA E O MAGNETISMO DURA APENAS 3 SEGUNDOS E DEPOIS PERDE O MAGNESTISMO... PODE ME EXPLICAR POR GENTILEZA? MT GRATO!
Why do all MOT to Electromagnet videos use the thicker gauge winding and toss the thinner one? Electromagnet power comes from the number of turns, not the wire gauge.
Magnetic field strength is determined by number of windings (turns) and current. Larger gauge wire can handle more current due to lower resistance. Not sure which is more efficient though.
@@charetjcMagnetomotive force is a direct result of turns times the amps. So each contributes the same. It depends on the max amps a given wire gauge can handle. Still, you'd think given the usual 10x difference in turns, would be a 10X magnet strength gain and and the fact the coils end up getting potted in epoxy, it ought to be able to withstand a little overdriving - All that tells me you ought to be able to get a decent electromagnet at the max amp value. I suppose it depends on the specific case.
Good job! But for best magnetic performance, I thing that the magnetic sheets steel must not be welded together, they must be pressed together but not electrically connected.
Not really. The reason that transformers use laminated cores is to reduce eddy current losses in the transformer. But for a simple electromagnet? Not needed. The biggest change he could do to increase the holding force on the electromagnet would be to use DC instead of AC by using a rectifier. And once he's using DC, eddy currents are not a concern.
@@jaspermcconnell6417 There are electromagnetic chucks that use either AC or DC. The main feature that is desired for either design is low retentivity for the core so that when power is removed, the chuck let's go. And, comparing both designs, the DC ones have a greater holding power than the AC varieties.
you are right, it would maybe run cooler if the power supply deliver pulsed DC (as opposed to DC from a battery f.ex.) In this video they use 12V 18Amp DC from a power supply I've never seen, so I don't know the specs on that one. It all depends on the width of the pulses etc. But if you use real DC it should not matter as others pointed out. In fact, then the field could be made 5-10% stronger with a massive, more pure iron core. The lamination he welds together(on the bottom) he takes away completely afterwards anyway, the ones on the sides stay and would produce more heat if use DC pulsed(like from a cheap switching transformer) or AC.
@@happyfox711 Isn't there a concern that the magnetic field lets go of the part with pulsed DC? I would think a constant current source would provide constant holding force, while AC and pulsed DC would have varying holding force.
You would have a lot better luck with that TIG torch if you were to lead with the electrode instead of trailing with it.TIG will not penetrate properly and your weld cosmetics will suffer when you trail the electrode.
Manufacture quality very good, you might get mor magnetic force (probably double) if you add copper in between the air gaps, it blocks B force in air gap, hence much stronger Field on top surface if you fill air gap with copper bars (no magnetic short, all exposed on top)
LOL. If it's a low quality speaker with bad shielding you could try to make a high power radio transmitter and by pointing a directional antenna to the speaker the interference could damage it. Just an idea.
Poor explaination of what is going on . Any new step should be explained and show the names of the materials used. Anyway, thanks gfor sharing knowledge. Regards.
"Self made" means that whatever is "self made" has been made or constructed by itself with no outside help or assistance by an outside agency. Generally speaking and as far as I am able to determine, there is no technology that enables something to make itself.... Just saying.
What you ought to do is find a way to redirect microwaves to make safe areas in our homes. In other words designated phone and wifi areas so we don't get the 5 and 6g. I think it's got something to do with waveguides? I'll be a subscriber for sure!!!
And why two wires green are connected to a yellow from one side and two yellow to a green one? Is a strange parallel? When tested they are all green with green and same with yellow, when welded no.
