DIY Super Electromagnet
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- Опубликовано: 10 сен 2024
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How to Make a BIG and Powerful Electromagnet with the Primary of the transformer of a microwave oven. Remove the Secondary. With Iron or Steel (ferromagnetic materials) it attracts with a really great strength. With non ferrous metals like aluminum and copper it repels them due to Eddy currents.
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This is dangerous. The real danger is in the secondary, the coil with lots of turns of very thin wire. Without that coil you are working with the mains voltage (230 V in Europe) and this, of course has risks, but it is not as dangerous as the hight voltage from the secondary.
From the two turns of very thick cable you will get a few volts that arent dangerous at all. The danger here is of high temperatures due to the high current. You can burn the cover of the cable if you arent careful.
Thx
But the secondary is removed?
1:02 Toast is done.
LOL
Apollo haha true
I was about to comment this
same
Thank you very much for your comment. Comments like yours give a lot of push and enthusiasm.
11 years ago and this was the only video that helped me
No this is not the point. All magnets and electromagnets attract ferric materials like iron or steels. They never repel them. What happens with aluminum or copper is different. Magnets or electromagnets dont attract them, but if you create a magnetic field it induces a current in a conductor. This is how dynamos and alternators work. This current also creates a magnetic field that opposes the first, this is why the plate is repeled. The same happens with the closed ring, but not with the open.
the buzzing sound is SO BEAUTIFUL!
Cool video. Every checked the resonate frequency of copper or gold? Put one on the top of a wooden sluice box to force the gold to stay at the bottom. Or hook it up sideways under the hopper of a high banker and shoot the gold into a separate section on the side to collect it.
How much current does it draw when it's on?
Yes, here is 230V 50 Hz.
Perhaps DC would be better if I needed to keep the polarity of the magnet (N/S) constant, but for iron is the same, Root mean square (RMS) is what counts.
Hello. Will you please take the time to explain how you did this?
To get a even stronger magnet take 2 primarys on i core and conect them in parallel
But you have to look that the windings are wound in the same direction !
But still great vid
Fokus
Wouldn't parallel OR Serial work, as long as the winding direction is correct?
Awesome!
But you shud try use the secondary instead (wich has more turns on it) and then use DC instead of AC (the voltage may have to be reduced so it doesn't overheat as there will be no inductance and the current will go up).
That way will probably make it even more powerful and you dont have to deal with the annoying vibrations and buzz caused by the AC
I am not sure that with low voltage and so many turns it would work. Perhaps the way to use with the secondary would be high voltage but with limited current. So for the experiment you would need 2 trafos. One complete to use as a power supply and the other only with the secondary (the electromagnet). BUT this is EXTREMELY DANGEROUS!!!!
*****
You're right as I forgot to count on the resistance in the windings and the limitation is (as in most cases) when they gets to hot.
If the secondary have for example 10 more turns means that only 10% of the current is needed to give the same strength of the magnet. But if the secondary have the same mass as the primary (wich it often has on this type of transformers) it also means that it will use 1/10 of the cross section area with 10 times the wire length
- that's 100 times higher resistance. The same will apply to other ratios of turns - for example 20 more turns only need 5% of the current but the resistance will be 400 times higher.
As the heat in the coil (P) is given by P = I^2*R - it most likely doesn't matter wich coil that's used (other than that the secondary can take higher voltage).
When using AC it's another thing because of the inductance. The inductance goes up with the squere of the turn number. As it's most likely higher than the resistance even in the primary - 10 times the turns will only allow 1/100 of the current to pass at the same voltage. So when using AC, the secondary is much weaker.
Also - it's not just bad to use AC as the inductance allow for a very simple design without the need for another transformer or DC/DC-converter.
Is there a load of anything to stop the wires burning out?
Is the switch the resistive?
@@wesleytaylor-rendal5648 No - but the resistance of the wire in the coil (or if AC is used, the inductance) will limit the current. The resistance of the winding is easy to measure with just a standard multimeter.
Then the heat in the coil can be calculated from the current (P = I^2 * R) or (if using DC) from the applied voltage over the coil (P = U^2 / R), to see how much current/voltage that can be applied - to make the magnet as strong as possible, without it overheating.
For continuous operation it shouldn't be more than maybe 30-40 W - but can be up like 50-100 W if a fan is added (depending on how much air is blown on the coils). But can be a lot higher in short bursts (if allowed to cool in between)
Since the coil and iron core has such a large mass, it will (unless it's extremely overpowered) heat up slowly and it's easy to see if it gets too hot and turn off or reduce power.
It's highly recommended to have a variable power source of some sort. Because the best performance for the magnet will most likely be on some arbitrary voltage and not the common DC standards, like 12 or 24 V or mains voltages such as 120 or 230. It's also nice to be able to vary the voltage/current for testing.
The fact it being a transformer for mains voltage from the beginning doesn't matter either, because the inductance goes way down when the core is taken apart. So even if AC is used, the voltage has to be much lower (unless you only plan to run it for very short "bursts" at a time)
For example a variac can be used (where a simple rectifier bridge can be used if DC is wanted), a bench power supply or (if using batteries or another fixed DC-source) an adjustable DC/DC-converter or simple PWM-regulator.
If using large batteries that consists of individual cells, the voltage can also be varied by adding and removing cells (they need to be quite a bit bigger than normal AA or similar though, haha)
You are a genius I will use this for metal detecting
I am too fascinated by this and the concept of electromagnetism. Most importantly the human related effects on a large scale and educating more people in this field. Would be interested in conducting an experiment using lab rats or guinea pigs unless someone has link to footage of such a test that would be great.
this is amazing, can u realize, with this kind a theory humankind can and able make a flying soucerse. thank u for the inspirying video man
You have to assume that the ferrous squares he repelled where simple unmagnetized pieces to begin with, then he clamped them down to the electromagnet temporarily to magnetize them to the SAME polarity, in the first moments the ferrous pieces attract as unpolarized, unmagnetized iron or steel, but soon enough they would be capable of repelling since like charges repel. You could do better by purchasing neo magnets and wrapping them in several layers of rubberized tape so they would be less likely to shatter when they fall. Maybe even epoxy/glass fiber wrap first layers of the wrap, then spongy, rubbery tape after that.
I know this is a dumb question but how do you connect the transformer directly to the plug. I have been working in a science fair project for the past few days but I didn't obtain the results I was expecting. The electromagnet turned out to be very weak. Was there something I missed? Thanks in advance, and forgive my English, I am still getting used to the language.
el problema es que no se que tipo de cable conectar y si debo conectar uninterructor
The metal piece is not a ferromagnetic metal like iron or steel. It is aluminum. Like copper Al is not attracted by magnets. But because it is a good electric conductor, the magnetic field induces a current in the Al plate. This current generates another magnetic field that opposes to the first one.
In my case the current is AC so the poles are alternating. If you used DC you could use a compass in order to determine the magnetic poles.
Oh yeah, this definitely gives me an idea for the cylinder on that marble/ steely cannon, to give it more power. I was hoping to avoid electricity, but, I will experiment. Thanks for this link!
This is the coolest DIY video I've ever seen...
Thanks for sharing
Thank you for commenting too! ʘ‿ʘ
Because is the primary the one that is suited for 230V. The secondary has a very thin wire that doesnt stand so much current.
Thought this was going to be a HowToBasic video at first lol
We tried making this, but when we hooked it up, it sparked and blew up. We understand the video up until about the 39 second mark. Which wires are hooking to which parts?
No. The impedance (internal resistance) is suited for 230 V, so with 12 V there will be a very low intensity.
Never realized how strong eddy currents can be. You try testing the force on ferromagnetic object though? Hook a scale onto that hammer, see how heavy it REALLY gets. ;)
It would be twice as powerful if you installed another primary from an identical microwave transformer and slid it over in unison with the first. Then energize it from another outlet on a separate breaker! Just make sure you have the windings running in the same direction or their 60 cycles fields will exactly cancel each other out and would most likely create a large amount of heat in the core between the two coils. That would be fun to experiment with!
I would like to see that!!
No capacitor. Directly to the plug. If it is too much current for your coil, you can put a stove or something high powered (iron, etc.) in SERIES. You then limit the current because the resistance of the element in series (i.e. a stove). With a low power element like a bulb you will get current too much limited so the electromagnet wont work.
Where did u get the transformer?
What is the duty cycle before it over heats ? which circuit breaker is suggested for safe operation ?
What voltage did you use ?
this is amazing!! I was wondering if this could be used with other magnets to create a super powerful motor?
Thats how they work👁👄👁👍
The 2 wires directly to the mains. Use the coil with the thick copper wires not the one with thin ones and too much turns.
Im looking for some insight and technical details on this setup. Im wanting help for a project in which i require a miniaturisation of a system similar to this, and use a multiple in an array to prototype a power generation system. Is the fact that the primary coil sits around the open laminates of the transformer core crucial, or just for convenience? I have read that it is eddy currents that allows the repelling of non-ferrous metals and that, the laminated transformer cores I'm referring to are designed to reduce these "eddy currents". My question is have you tested a solid block of ferrous metal versus the laminated transformer core your using here and, if there is anything of note, key technical details pertaining to its differences, then I would like to know. thank you. if you could get back to me on this it would be much appreciated.
Is there a capacitor involved? Did you just cut an extension cord and plug that directly into the wall?
I have a question, could this transformer levitate if the aluminum was attached to it or would it ground out. I mean if it wasnt touching the copper the whole thing could hop or maybe stabilize? been looking into ways of levitation.
How much current u supplied and how many turns. And.. thickness and which wire..which iron core plz plz plz sir..sir..plz tell me ..plz reply
I dont make it intentionally. The mains AC current is at 50 Hz, that current shakes the plates at that frequency.
arnt these trasnformers extremely dangerious.? Like can kill you with one wrong accidental touch? Cause i wanna do the same thing but from what ive been reading apparnetly these things kill.
What is the maximum weight it can pull or repel!
Sir..i am trying to separate granuels of plastic and copper wire with help of eddy current..why its not working..bcas of small size???
Hello, kindly, I recovered a transformer from an old welding machine, I removed the secondary and I made an exceptional magnet giving 12 volts. Now I have half of the reed valve left, can you tell me when you put the wire you need to make one, "other , 2 mm wire the reed valve is at least twice the size of the microwave one ... Thank you very much
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?
hello,i have an urgent question.
if i attach this electromagnet to one side of a 1 cm thick steel sheet will other metals stick to the other side of the sheet?
How much ampers need this coil? This second coil will not work better?
Your problem is that a lamp plug is perhaps too weak. Try a bigger one, like the one of a heater, washing machine, etc. With AC there is no polarity, so it doesnt matter. I think there is not difference not soldering the wires.
Can I just cut an extension cord and plug it in then connect the wires to the terminals? I kinda don't wanna burn my house down so please reply ASAP. Thanks
+Oliver Smithdeal Use a power bar, with a circuit breaker.
www.walmart.ca/en/ip/powerpro-6-outlet-powerbar-4ft/6000189478230
These $8 could save a lot of damage. If something goes wrong, and your device draws too much power, it'll shut it off for you. From there, use a short extension cord to get the project explosion-safe distance away from you, you can power it on with the switch on the power bar from a safe distance.
These transformers come from a microwave, which usually have well fitting connectors built into a grounded cable. Plug that into the power strip. Cheap, safe, reliable, fun!
+Oliver Smithdeal You can use a AA battery, or any battery for that matter (car, 9v) at the cost of slightly reduced strength of the magnetic field it creates
Martian63 A car battery will not reduce the field strength. While I can't measure the effective resistance of the magnet, I can tell you that a car battery outputs more current (in the order of 200X) and more voltage (12X). While not all of this potential will be used, it will give a stronger magnetic field.
When I said reduced strength, I was referring to the AA battery compared to simply using contacts from an extension cord that is presumably plugged into a 120v wall socket.
Cuthbert Nibbles My point being, that the amount of current going through coil means the stronger magnetic field that gets created.
how much current and frequency ?
Around 8 to 10 amps at 230 volts 50 Hz.
if i use a large neodynium magnet (40 x 20 x 5 cm) and wrap it in copper coil then run 24 volts through it what would be the pulling power?
why do the metals jumps away from the transformer when brought closer.
Explain.
it looks like the metal that is doing that is aluminium so its probably related to that
Just like a real magnet: it repels metal because of the magnetic field.
think of magnetism as flowing like a river and with currents/eddys in the flow; non-magnetic material can still get caught in that strong flow and be pushed/repelled
Hi, i'm thinking to use electromagnets in order to create linear motion to a block of metal, do you find this possible?..or maybe efficient?
Could you please tell.. is that a magnet or piece of metal repelled away
welche Volt Spannung hast du genommen (what voltage have you taken? )
what happen a normal DC electromagnet is kept in a high magnitude external magnetic field will it be able to maintain its polarity as before in a free space??
how do you keep the objects floating on top of the magnet ?
Eddy currents.
What is the voltage. Amps. And Hz. That is needed for it to work?
microwave oven transformers (mot) work at 230vac and get you an output power of 700-1550va. so you'll need 3-8 amps with closes EI Core. But here the Core is open, so the amps will be higher than usual
+mason beck i think any voltage above 5v dc will work, but you will have a very weak magnet. a car battery is save (unless you get your hand between the metal and magnet.) and because of the high current a car battery can deliver you will have a very strong magnet (a coil has little resistance)
+Gijs dc wont work for this experiment, you will need alternating magnetic field to cause induction in the aluminium
+testyakola yeah, alternaring field can be DC too (on/off)
Why do you remove the Secondary coil? Why can't we just NOT USE IT? OR (maybe better yet) re-wire it PROPERLY so it can ADD TO THE FIELD generated by the Primary coil?
Why do I have to remove the secondary coil and put the primary coil back into the transformer
Does it matter which side u cut the transformer to get the coil and what volt battery did u use to power it.
i wonder how if using smaller diameter wires and a lot of windings and using high voltage dc and less amperage, do we can build motor by using this method?.
Very nice
Damn i love your videos, they're so quiet!
Look for "Copper pipe and neodymium magnet" on RUclips. Enjoy the second video at the list, the one with the magnet that almost fits in the tube.
halo....could u please help me with ...how to calculate the inductance of MOT with 12V 10AH battery.
I tried it and the thing overheats in 5 seconds. is it supposed to be like that? or what am I doing wrong? how does it work in microwave without overheating? does it has to do with closing the top part?
+Artur Amirkhanyan Yes, it is normal because that is not designed to be an electromagnet but a transformer. You can try to limit the current, with some appliance connected in series. The less power the appliance (i.e. a light bulb) the less current will go to the trafo. With more powerful appliance like an electric stove you can give more power.
+Mopatin I made my electro magnet and it works great but I can't get it to repel. I tried reversion the currents and tried different metals but it won't repel any suggestions? Thanks
+CAMERON BROOKS Don't use ferromagnetic metals. You can use aluminum or copper. Try a squashed ball of aluminum paper or a ring of copper wire (closed)
How many Amp does it need to lift that hammer or something lighter than that?
how do you get it to push instead of pull I have made a few and I cant seem to get it to resist only attract.
+Daniel hernandez All magnets and electromagnets attract ferric materials like iron or steels. They never repel them. What happens with aluminum or copper is different. Magnets or electromagnets dont attract them, but if you create a magnetic field it induces a current in a conductor. This is how dynamos and alternators work. This current also creates a magnetic field that opposes the first, this is why the plate is repeled. The same happens with the closed ring, but not with the open.
Bonjour quelle sont Les branchement exac pour pourvoir un résultat comme ceci
Ciao cortesemente ho recuperato un trasformatore di un veccia saldatrice , ho rimosso i secondario ed ho fatto un calamita eccezionale dando 22 volt .adesso mi è rimasto i la metà del pacco lamellare ,mi puoi dire quando metti di filo occorre per realizzarne un,"atro ,filo da 2 mmm il pacco lamellare è almeno il doppio di grandezza rispetto quello del microonde ...Grazie mille
What
I noticed that the secondary has more windings than the primary (step up Xformer) why didn't you use the secondary for the magnet?
I was woundering how you set up your wires to get it to work, i pulled mine apart like yours but i need to see what the wires look like. I wanted to either make it have a power outet and a switch or a 9 volts power supply. I'm doing a project for my auto course at my school and need help.
can you use more then one of these to make a super levetaion device?...like 4 set up beside each other?
+MrCasperdj777 Perhaps connecting them in parallel, but you would need a lot of power, i.e. 2000 x 4 = 8000 W
what is yours hooked up to? a car battery? also how hot would this get? I have 3 of these set up & waiting on a 4th before I try anything.
+MrCasperdj777 To the mains. 230 volts. About 2000 to 2000 wats.
Wow!! Making an experiment with iron filings. Is there any way of making a longer rectangular contact surface...and if so would it have a North and South pole?
thank you....it is great......so i can get this from a broken microwave>>right??
Thanks so much! We've got it working now.
can a12v battery work on this? and how did you connected the primary
+Mopatin i made my magnet and it attracts great but it won't repel, what I tried is put closed loop of copper wire on the magnet while it ran on dc and the copper loop while it was running on ac I also tried the ball of aluminum and it didn't repel please help I'm trying to do a school project where I'm launching a piece of metal please respond A.S.AP!!! :)
so an electromagnet will repel non-ferrous metals, but how would you make an electromagnet repel a permanent magnet?
You would need DC for the electromagnet, and you also need to avoid the magnet spinning to the other pole so it would be attracted instead. i.e. put the magnet in a tube, like this: Magnetic Springs (second half of the video)
Question: I want to make a ferrofluid sculpture. With the iron particles suspended in a carrier fluid (think oelic acid and odour free kerosene), would this make a suitable electromagnet to magnetize a small iron mixer screw in the middle of the ferrofluid solution?
How long can u leave it on before the cord heats up? Have u tried 2 primaries in series? If so, did it become stronger?
Hello I would like to make a eletroimã for refoulement as you did at the end of the video.
How can I make a to have a force of 5 kg?
Thank you!
Hi! I've tried replicating this experiment and have been having trouble (as are others from reading the comments) getting the eddy current induced levitation to work with aluminum on a 120V AC 60Hz power outlet. Can anyone explain as to whether perhaps the problem is more attributed to power, frequency, or geometric configuration (or some combination of the three)? My personal end goal is to levitate a hallow aluminum shaft (if at all possible)
+carnotricecooker the aluminum isnt ferromagnetic, this is the problem
Try something else like iron, steel, and copper
sorry for my ignorance, but why do you remove the secondary? does it reduce the power?
supercrazy50000 Because an electromagnet has one coil and a transformer has two independent coils. The coil connected to the current is the primary. This primary generates an alternating magnetic field that is "absorbed" by the secondary and generates the transformed current, so you don´t have a magnetic field to play with. If you remove the secondary you have the magnetic field from the primary.
oh thanks ^^
supercrazy50000 Actually a coil is a coil.
You could do this with either coil, or probably both. But the primary coil always had thicker, heavier duty wires. The primary usually has less coils, unless it is a step down transformer.
If you program the switch to turn on and off rapidly. Then you add a magnetic piston attached to a flywheel, thus creating electricity, would that power up the battery and provide extra energy?
What if you attached a significant amount of the repelling metal to/above the magnet, would it levitate all together??
If you put another magnet of the same set up above the one on the ground in some sort of rig and put the metal on the bottom one like you did but when you turn the power on it powers both magnets at the same time will the object float inbetween the too?
I couldn't contact you so here is a short version of what I have to say. I made the magnet, but I seem to have one problem the plug I'm using tries to melt about 10 seconds after it is plugged in. do I need a different type of plug I'm using a lamp plug. Does the copper coil have to be all the way flush with the frame? Also is there polarity on the coil? It was a test run so the wires weren't solder down it was just bent through the holes would that make a difference?
Can this be attached to the back of a car and reversed to push? Thinking it could dampen an impact possibly...?
What is this being made out of? The block thingy that you're cutting?
Did it safe when you meet the probe of AC current? Did it not short?
Hi, i used a 450 turns primary coil transformer with an ac current of 10 amps but the aluminium plate did not repel, it's just vibrating a little bit. So what do you think is the problem?
how can you make this in a electromagnet for continously working times of around 5 minutes?
Chisco Garcia Gonzalez You would have to use low enough current that it could diffuse the heat. Either that or find a transformer with higher gauge wire.
Make a box and put a crystal in it and see what happens, I watched an old army video and that was the subject of the video and that has something to do with free energy
I did this with 120 V and the breaker trips. Are you using something to increase resistance ? What are you using ?
With the transformer cut like this, there isn't enough inductance to be be able to connect to the mains. Don't hurt yourself, use a battery, and use DC current.
after 0:41 seconds, what did you attach to the coil to power it ? I've seen people different power supplies, like a laptop charger, or connecting it to a AA battery.
A cable with a swith direct to the mains (230 volts)
Can anyone say me what happens if we increase the turns in the primary coil...and pass high voltage
Please what power is ? Is ac or dc and how much volts ? Thx
Thanks for the video. Very informative! Exactly what I was looking for!!!!
Is it work perfectly ?
man what would be the resistance, inductance of the primary winding .can it be on for long time continuously ?? like for 2 hours
How much weight was that you lifted? And how many volts? Thanks
Directly to the mains. 230 V
How to make an electromagnet with this power using DC current, car battery for example?
If you can help, I thank you
It is the same, but you need less number of turns and thicker wire, because you work with more current and less voltage.
Did you measure the Repulsion force when it lifted off. If so what is it?