Making a Powerful Electro Magnet from a Transformer
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- เผยแพร่เมื่อ 19 พ.ค. 2024
- Yet another use for an MOT transformer! In this video, I'll show you how to select the right transformer & converter it into a powerful electromagnet.
Thanks to Duroweld.co.nz for sponsoring this video! :)
Hugong Tig welder: duroweld.co.nz/collections/ti...
Information provided in this video is for educational purposes only.
If you attempt to recreate/replicate anything you’ve seen in this Or any other video, you’re doing so at your own risk.
Schematix
One main reason I keep enjoying your projects is that you do a great job explaining step by step process involved even in the most basic things. Great job sir.
Hi thanks for a very informative video. I do however do not agree with your indication of the magnetic path. The magnetic fields will split at the centre pole and flow the the other two faces generated by the cut you made. If you lay the magnet on its side on a piece of paper and energise it lightly and then sprinkle iron filings on the paper the filings will align with the field and you will be able to see where the magnetic path is.But none the less I think it was a cool video and was presented in a very logical manner. Thanks very much
Louis
Correct,, that's why I enjoyed that project.
Good job.
Gardening with electric and magnetic?
Thanks your information ❤
Grinding, drilling, clamping, mill work, dent pulling, project or heavy material transfer, lock and that is just off the top of my head. Great video
Not sure if someone has already pointed out this minor detail, but I will go ahead and do so: when he drew the magnetic field lines for the transformer after being cut in half, the field lines should have actually gone from the middle section out towards the two open ends of the transformer at the bottom, not towards the closed end of the transformer on top. The vast majority of the flux goes in and out of the open ends, not the sides or top. You will notice this if you try to stick some iron on the top of the transformer- it will not stick nearly as well as on the open ends at the bottom. Very cool video though, and nice way of illustrating things!
Magnet in middle> magnet on-under
Energy flows in the path of least resistance. Therefore the flux will take the straightest path from the copper the iron core because the air presents higher resistance to the flow or current produced by the power supply. Energies natural state is to 0.
@@buckaroundandfindout Yes, the magnetic field will avoid going through the air any time it can, but if you put a gap in the path of the magnetic flux like in this case here, it will go through the air. The two ends have one pole, and the center has the other. The magnetic field is trying to complete the circuit between those two poles in the most efficient way possible, therefore it will come off the ends like I described. Any other path would be longer than that.
@@HeyChickens constructive Central pedal divergence is what you are referring to. Yes some flux lines will flow through the air because there's no room for them in the path of least resistance. Especially in the case of an electromagnet where the force is being pushed into the dielectric field thereby forcing the internal forces to become external. Gaussian flux is introduced to a piece of steel in which it is changed fundamentally on the molecular scale therefore allowing a bypass of the flux fields in what is known as counter space. Where you see the flux in a feral cell is usually the path of least resistance ergo where the force is not located in the flux line. The force is in the space in between the flex lines, that is where you will locate the bulk of the energy that is being displaced via the lack of pathway in least resistance.
Furthermore magnetic attraction is a little bit of a misnomer as far as the words and language describe the actions. It would be more accurate to say that two pieces of metal rushed to a null point that is a convergence of flux lines in relation to the spin of electrons due to the polarization of rare earth metals. Ergo Force equal to attraction is acceleration to a null point.
Very impressed👍When testing heavy loads, make sure to insert safety link in both directions (use slightly loose rope), if the magnet fail at 300kg or more, the steel block will hit the car and the magnet can hit you with a great force, be careful!
Enjoyable video, I wish my Electrical Engineering tutor at college 60 years ago had, your interesting approach about magnetic flux.
Something about this dude just makes him enjoyable to listen to and learn from.
Very informative video and it gave me great info on which type of voltage/current to use. Here's a project that I'm starting to work on. I go prospecting for gold out here in Arizona and we have a lot of " black sand " in our good paydirt. I'm taking a 4" pvc pipe and going to tape/strap 2 of these on either side to pour the dirt through so the magnetic field will "stick" the magnatite ( black sand ) to the sides and let to paydirt fall through for further processing. Challenge is to build one of these and post a video. Thanks again and I'll post pics when I'm done.
Your experiments flow just as i would do them myself, thanks for the detours
Great and useful project. I'm a woodworker with a good quality cabinet saw. I use two electro magnets in a wooden feather board to guide my work through the saw instead of using my hand (for obvious reasons), I can position the feather board anywhere on the cast iron table to fit the work I am cutting. I wished I had seen your vid before I purchased the magnets from Aliexpress. Going to build your drill press vice next.
Excellent demonstration of exactly the kind of info on electro-magnets that I was looking for. Thank You! I will be watching if you decide to utilize AC power in demo and it will be interesting to see the pro's and con's of DC vs AC with powerful electro=magnets.
Great video, excellent descriptions! I'm wanting to build a trommel with an electromagnet Incorporated at some point to remove nails from wood ash.
Thank you for posting!!!
That really helps me understand how magnetic power works thanks for the great vid 👍🏼
I've watched two videos on magnetic vices. One created a "magnetic table" that holds the work with the vice mechanically attached to the table. The other used the magnet to hold a traditional type vice to the table. Both have advantages. If you want to get really creative you could try removing the other side of the core as well and see if the drill press table would work as one side of the core making a magnetically held magnetic table. 😎
Great ... The pulling power was truly amazing
Awesome video I enjoyed it… hopefully everything is cool down there in New Zealand looks like you guys are on lockdown over one single case! No deaths! Better days ahead ❤️
Put different sized nails into different types of soft and hard woods at different depths and see if you can devise a practical electromagnetic nail puller.
yooooooooooooooooooooooooo
This
Nails have so little surface area for the magnet to lock onto, it would be virtually impossible to devise an electromagnetic field (out of a microwave transformer anyways) capable of pulling a nail out of wood, especially hard wood...
Love the way you explain what your doing !
That's a surprising amount of holding strength for such a small magnet. Maybe it could be used with cart type frame for a rolling gantry to move things around.
You could make an electromagnetic door lock. Also, the reason I am studying magnetics is to make a large magnetic lift for scrap metal. I think you very much for the ideas I have taken from your videos. Great job.
Best electromagnet video ever!!!! Damn good work!
I’ve seen loads of videos on microwave transformers converted to spot welding transformers, but this is the first time I’ve seen a conversion into an electromagnet. Nice work! 👍 I’ll give it a try myself.
Yup, a storm's power surge took out my microzappr, I knew there was a good size transformer in it and cut two groves with an angle grinder. Having an old truck battery
with external cell connectors, I can use at 6 or 8 volts and not overheat the primary coil.
@@raymondgarafano8604 I could not find microzappr online. What is that?
@@headbanger1428 a microzapper is just another term I use for a microwave oven,
that's all, Maybe I should have called it a micro-doo-hickey, a micro thing-a-ma-jig.
There have been dozens of copies all the same for years.
Pathetic.
@@user-de8bu5es6f Replies little man to a comment of 3y ago when there wasn’t.
That is impressive. I will be building a few of these. Thank you for shareing your knowlege.
Woooow!!!!thats awesome!! That was completely counterintuitive for me.thank you sir.i want to try it with circle core.
Thanks for your lessons!!Congrats from Aussie! 👏👏
Best explanation on TH-cam! Love the Brit speak. Bob's your uncle!
wow, i had not expected that strength with only a bench power supply. I was thinking about making a big electromagnet from scratch but when you can just grind away the weld on an MOT to have a super good one at hand, that'll serve me a lot of work.
Good to see that I am not the only one obsessed with magnets!
I couldn't help myself - I made a video on my channel several years ago. You have given me a few more ideas......
I have several microwave transformers that might be taking on a little transformation themselves 😁
Next term I will be teaching night classes on automotive electrical subjects. I drag around a rolling trolley with heaps of wire and you guessed it.....lots of permanent magnets as well as electromagnets to show students how solenoids, motors, relays and other tricky electrical components work. I usually use a rotor out of an alternator as an electromagnet to show magnetic strength holding a solid shaft of steel, but your idea might be a good alternative (excuse the pun) option!
Keep up the good work! 👍
G'day from 'Across The Ditch'
MiracleMAX
Excellent video particularly on ease of selection of the transformer. A very cheap mag drill is in my mind I always wanted, and, what I really want to do is a cheap method to have a kill switch on my digger I need to be activated by trips for safety where the "real thing" dam near costs more than the machine. (the magnet will hold the fuel shut off open and another can similarly lock my hydraulics simultaneously on the same electric circuit). Thinking that much power would also work as a lock on the slew control (it's the real one that kills people tripping or catching clothing) in a circuit where if it's not locked the fuel and hydraulic one power off). Been trying to find a way to do this for ages.
Everyone else on the planet would've drawn the magnet on the whiteboard with North on top. Not a Kiwi!.. Great vid, long time sub. Keep 'em coming!
hmm.....like this is as if a great suggestion 😅
@@mvnar What?
I'll never look at an old microwave the same again, thanks.
Great video, good narration and not annoying like some. I came here with the same idea you had, of making an electromagnet vice :).
Amazingly well explained and demonstrated, thank you, many questions answered!!
Try magnet fishing!!
I will use it to load heavy pieces of steel Into my lathe and mill with my jib crane. Awesome video with how to and verification! New subscriber!!
Great video man! You clearly put a lot of effort in it, and it shows. It would be a great electronic lock for your workshop. Not at max current, that would be too harsh for the winding. Or if you make it waterproof, it could be a great magnet-fishing device. Power it up with a car battery. And I sure can use a scaled-down version to get the thousands of tiny screws and bolts out of my long fibre carpet.
Great stuff. Electro-Vise. Gonna Build One Thanks.
Magnifique Monsieur. Merci pour la vidéo.
+ 1 vote for next video to make a magnetic chuck or vise!
😃 he did it
I love your channel. You are good at explaining things. Also I love your accent and sense of humor. Keep up the good work!
The ideas are endless so many possibilities
Thanks ,guy. Thats a cool idea about an electric vice block,like a workbench that holds things still while you're working. You should patent it(fast)!!😉
Really...you do have very professional welding skill. Thank GOD ....yes you do have! 😇
This video must have million subscribers already... it is very informative!
Thanks for going thru the steps with a slow/easy understanding informativ learning 💪
Nice, use to lift megalithic blocks in chain out of a quarry the way Ed might have , seriously, it is amazing for the current used.
Love your videos. Today I started a project to build a tape demagnetiser for old Video8 tapes, audio cassettes and reel to reel tapes. I found a good looking design and tutorial online that repurposed a Microwave transformer. I found a 240 volt LG Microwave oven with a primary winding rated at about 9 amps and pulled out the transformer and micro-switches. After removing the secondary winding as you have done I was left with the primary winding intact which I tapped up to be flush with the top of the core face like your electromagnet. My question is, I cannot get any DC resistance reading on the coil, not even .01 ohms. I cannot see any damage to the coil causing a short. I wired the coil in series with a 40watt incandescent globe which turned on normally, (not a good sign I think) I'm nervous about putting 240V across the coil in case it is indeed shorted. I suppose I could put a variac in front of the coil as well as an isolating transformer (I have a 1KVA ISO transformer) to help upsetting other electronic equipment if it violently trips my RCD. My other option is to wind a new coil. What do you think?
Damn great video mate, I will now experiment on how to use this in my workshop and for teaching, many thanks, cheers.
Big with ups to you for this education , thanks heaps. Your education skills are great with your presentation with details the most important. thanks
Thanks for making this video! It's great to have these concepts explained in such an easy to understand way!
Very interesting - and lots of potential application. Much obliged 🤠
Wow, very impressive cuzzy bro!
Just one bit of feedback and maybe someone else has already pointed this out, don't have enough time to read through all the comments.
That is in your explanation of the magnetic field path in the cut core, you've got it going from the center limb to the back of the core when in reality it is the same path as in the uncut transformer, via the left and right limbs of the core. You can confirm this by checking the magnetic strength at the back of the core and you will see that it is just as weak or very close to that around the uncut core. 300kg plus, holly sh....t!
Keep 'em coming, great video and very enlightening.
Cheers and stay well from across the pond.
Very informative video .
Sir , thank you so much for sharing your knowledge .
I am from Sri Lanka .
Thank you for the great explanation and demonstration. Most helpful for me is your way of choosing the wire best suited for your requirements.
Amazing!👏👏 good job.
You explained very well.
Keep doing...your good job...
THANKS !! You are a big help and I sure appreciate your help.
Wow you are amazing, great channel for R&D
Great video! Very informative and helpful. 👍
good boy.....same as i use...angle grinder/chop off saw (homemade from furnace motor, and microswitches from microwave).....to re-create MOTs for chargers, welders, etc. made an 18 volt dc supply for cordless tools, converted to corded tools, ...mots rewound for 19 volts dc with capacitors and bridge rectifier.....all work wonderfull....good for you...
Been wanting to make a jig table & a magnetic drill press would work great. Also a surface grinder would be another thing I have been wanting. Been thinking about a magnetic brake. No surface wear. BTW good video. Going to see how much trouble I can get myself into.
Nicely explained, thanks for sharing :)
Thank you for the new numbers. I need to bend 4 meters .8mm stainless for a “Tinney” boat I’m building. My initial bender is angle iron with 40x100mm door hinges attached to a 100mm square x 4 meters wooden beam. The stainless sheet is clamped by wood screws through the angle strip, through the stainless and into the wood leaving holes every 200 mm to be filled in later. The design is now changing to have the stainless clamped between angle iron held with a series of microwave magnets and a heap of car batteries. The duration of the clamping will only be seconds during the actual bending process.
Your welds r awesome I loved the video thank u Sir
silicone or encapsulate it somehow to make it for under water magnet fishing. could be a cool product to sell on the cheap that works with portable powerful batteries like bike batteries or stronger. excellent work your doing!
Make a portable wheeled card electromagnet for wheeling over the yard to pick up miscellaneous screws and nails. It'd be cool to make one for separating black sand from the other sand.
very impressed!
I was getting worried that we were close to find out what the weakest link of this setup was rather than the electromagnet strength itself. it might have snapped and smashed the car or fly in the air at random.
great demonstration!
Hi Schematix, the reason magnet became so strong is the magnetic flux path. When you cut the E-core the side became free and magnetic was traveling through the air to complete its parth. Now when you placed the magnet on I-beam it became the bridge to that magnetic flux path and that is the reason it was so strong. Check the Permenant Magnet Holder of Lead Skalkin, he placed the two coils in each prong of U-shaped bar and then bridged it on the top, you energize it and remove the power, the magnetic flux will then run for ever in that loop and it can hold pretty good amount of magnetic. Good experiment. I liked your video.
But I have one Question: Why Australian put South pole on the top and North pole at the bottom?
You could use your microwave electromagnet for the base magnet in a mercury vortex drive; so, you can vary the field strength and direction giving you additional control over the vortexes rotation.
no
This TH-cam started with a warning about dealing with AC mains power supplies. I was more afraid for impending injury I saw developing as that chain fall was being used. Not very many years back, loggers in the Pacific Northwest of the United States lost limbs and lives from set ups just like that. Test they went home at night and toasted bread, heated their rooms, shaved their faces, and used all manner of AC devices with little or no knowledge of AC power danger, and survived till the next day. When a chain fall dragging tons of logs could break with no warning.
I love you videos, and I was greatly relieved when you chose to relax the strain on that set up. Honestly, I was more concerned about the webbing failing than the scale device. All that would have happened to that device, if you had kept pulling, would have been it’s internal sensor would have turned belly up. But if that webbing would have failed you would have had a whip moving at (likely) super-sonic speeds just looking for some appendage to separate from a body.
A common use of MOTs repurposed this way is to create a magnetic drill press base that can instantly be attached and detached from any ferrous / iron / steel workpiece of decent thickness at the flick of a switch. Retail units run pretty high up in the price range just for that functionality alone.
The second popular option is a machinist electromagnetic vise it chuck, more often than not is used with a surface grinder, followed by a milling machine for workpieces that can't be held down properly with any other means. While switchable permanent magnet versions do exist, they have their own drawbacks and quirks.
My primary problem is figuring out a decent rectified DC volt+amp combination for the MOT electromagnetic coil, preferably something that can be derived from outlet power, most likely from a switched mode DC power brick with current limiting.
Hindsight beats foresight by a darnsight! Good video BTW, thankyou
woow Bryman i really happy see all hobbyist engineers using over expensive flukes
Simple as that ! Thank you.
Very well explained.
This is the best and most detailed video I seen and was exactly what I was looking for you got yourself a new subscriber 👍👍
Keep reducing the power supply to the magnet ( volts and amps equally ) to see at what point it fails at 300 kg's, then find your wattage from that and divide it by 300 kg's to see your watt strength in Kk's lifting power. Great video, well made and informative, would never have guessed that a low resistance in the system would make such a difference.
In other words a transformer core contains all the field, as long as the core isn't saturated. Thus external iron doesnt interact with the magnetic fields inside the core. But where the field exits the transformer core, they can interact with external ferus metal.
The field lines are are in a close circuit.
The horse shoe magnets would be having pole pieces when stored for long time.
The torroid core design assures self shielding meaning any other torroid core transformer can be placed just beyond half the diameter distance of the bigger one.
In the case of a solenoid winding to minimize/ avoid interaction the coils would be placed perpendicular to each other and in the case of a third coil, it would be placed in the vertical plane.
You can observe this in the radio circuits.
@@subramanianr7206 if one rewatches the video 5:14 , the original core before being modified was expelling some magnetic fields. That's indicates over saturation that inturn indicats one should run fewer amps due to the fact that the rate of increase in the magnetic field drops due to drop in a decrease in permibility.
en.m.wikipedia.org/wiki/File:Permeability_of_ferromagnet_by_Zureks.svg
But, on rexamination of transformer design, i might be wrong on the saturation current after the core was modified. Transformer design sometimes introduce an air gap to increase the saturation current level. Cuting the core in half introduces a large air gap in the magnetic circuit. Presumptively, that will also increase the saturation current level, maybe well beyond 4 amps. The large air gap now allows for using the core as an electronagnet. But when a piece of metal closes the air gap, the saturating current level will drop.
Take away is that there are more things to consider what current one wants to run depending on the core and how one will use it.
Congratulations. Very useful idea.
Perfect for building a mag drill press. I’m thinking put it in the base of the drill press so you can stick it onto the surface you want to drill like on multiple holes in large iron plate.
I like the magnetic chuck idea. I've seen them on commercial machinery (e.g. milling machines, drill presses, surface grinders, etc) but never considered making one myself. My to-do list has another entry.
You could possibly make a child's toy with the E-magnet.
Electric trailer brakes would make a good magnet, too. I got 2 electric brakes from a floor scrubber I plan to utilize on my drill press.
This was an excellent lesson, thanks for taking the time to explain what's actually happening! New sub 👍👍
Wow Awesome power👏 thanks for sharing
Great test. Electromagnet,..thanks❤
very cool. so small yet so powerful. I made an electromagnet using a 65-pound steel bar and about two hundred feet of insulated copper wire. then hooked it up to a 12-volt deep cycle battery. it was strong, but not as strong as that little one you made. And it got hot quick. Thanks for the perspective. Ill change my design. ; )
Homemade mag drill. Perfect perpendicular holes on large things you can't fit in a press, even vertically or upside down.
We just had roofers replace the shingles on our roof and I was thinking of how I could pick up all the nails that where left behind. Something like this with a lite weight battery on wheels to go over the ground and rip all the nails and metal from the soil would be perfect.
Excellent video. Thanks
Excellent. This was fun. Two questions:
1. Why 0.5 to 2.0[ohms]? Is it ONLY about what resistance across the fixed DC source voltage which allows the desired peak current?
2. What type of supply was used in the second (car tow hitch vs. steel pole) test? Was this also an adjustable bench top supply, but with higher current capability?
3. What happens if you hook the coil leads to an AC source, eg. a 120[v] (rms) from the wall plug?
OK, that was three questions.
Thanks again. Very educational.
mag drill son . better still convert a drill to a mag drill. to save the cost of buying a mag drill .
E-magnets are better for reaping/tearing uses than for lateral/sheering. Just think of those permanent magnet pickup clamps; when you turn them off you basically rotating the load to short the poles...
A very nice presentation , thank you
A very good combination of theory and application, well done!
One thing though: with a cut up transformer, the vast majority of the magnetic field lines go from the center bar to the side poles, not around the transformer (9:32). That's what causes the field loops to be closed when an metal object goes across.
solid metal will be stronger the laments are there for AC current to eliminate eddy current. the more turns the stronger the magnet will be, to keep the voltage down you can rap the wire by double or more. because there is no magnetic field fluctuations you don't have to worry about eddy currents or induced back voltage so your wattage will remain low. great video.
Cool video, thanks, this was very helpful! Subscribed!
Your video is great, you don’t just explain things really well but you jump in with everyday practical experiments we could all do. That is really powerful and to think it came from an old microwave transformer too, I will use this on my own project, thanks
I'm from the future. Magnetic fields were used crack near speed of light travel. By creating a magnetic field around the craft. They are able to control the magnetic frequency and adjust it depending on the related force in proximity.
Very useful video. Thankfully
Awesome advice and well presented! I learned a lot. I do have one piece of advice. Next time don't heat the laminates in the core. They do have lacquer on them for a reason. Laminations perform better in a transformer core than solid iron or molded ferrite powder. It's important for the laminates to be separated from one another with the lacquer. If they touch one another conductively it reduces the efficiency of the core. Next Time start with a new core that will not be damaged by taking it apart or welding all the laminations together into a solid conductive core. In the least don't weld the laminates together. Perhaps put it into a vice while applying some two part resinous bonding glue.
كم من فولت
So how does the liquor get the laminations of those cores that are welded already
@@richardsellars8598 I used the term lacquer but I dont know what material engineers use to isolate the different laminations. I only know that it's a proven fact that isolated laminations create the least resistant transformation. You'd have to ask an engineer how they manage to retain isolation because i dont know.
Thank you for this informative video ! I surly could use the electromagnet that you demonstrated, to pull dents out in autobody applications ! The setup that you have would help me GREATLY in repairing my truck !
Won't work. It will saturate.
0:40 in 40 seconds you have just covered my main complaint with most EM videos
Awesome video again :) It would be really useful as a device for holding down steel work pieces when they are being machined on a miller or surface grinder, already ordered a power supply :P