Four weeks ago I was searching for an magnetizer that can revive my dead magnets (I killed them heating up at a high temperature, trying to encapsulate in a piece of glass), but I haven't found a instructable project that can help me, so with physics teacher's support I made one that works. With it's help you can revive dead or old magnets, or you can magnetize things like screwdrivers, nails, paperclips, or any metal which can be a good magnet. It looks like a game console, isn't it? This device is only a PROTOTYPE, so maybe I will try to make a big one that can magnetize your hammer. Now let's start the work. Step 1: Materials.
The materials you need for this project are: - a 1N4007 diode - a DPST switch (I get mine from an old computer) - a Push button switch (or how it is called) - a jack and a capacitor(230 uF and 400 V) from an old power supply unit - a plastic, wood, Plexiglas, or any material you found, but NO metals like iron, steel, aluminum, copper or any metal that are atracted by magnets. a 15 W, 220 V lamp - copper wire for making a coil (0.6 mm diameter for 800 turns) - something on you can spool your coil (I use a plastic support from solder with inner diameter 20 mm don't use something that have the inner diameter bigger than 20 mm because then your magnetizer will not work) - a cable for your jack (I use an ordinary cable for PC supply), why I use it? Because it can be removed.two plastic panels (I made them because my case needs panels ) - 20 cm of thick copper wire (2-3 mm diameter) Tips: Watch out how you handle the capacitor. If it is charged, and you touch it, you can die. Try to make the capacitor's links with push button switch and with coil as short as you can, Step 2: Make the Coil, the Panels, Paint Them and the Case.
I stick the coil with hot glue on the back of the front panel, and the capacitor on the bottom of the case. I drill a hole through the top of the case and stick a piece of blue transparent plastic to see the light. I stick a piece of plastic on a side of inner space from the coil because when you push the button of the switch, the magnet or the thing you use will be throw out, depends of the size of the thing. If you are touching the thing while you push the button, you will feel the pulse passing through the thing. Stick it as good as you can, because little things like nails can detach your plastic. I stick the DPST switch and the PC power supply jack of their panel putting hot glue among them.
I drill a hole through the top of the case for the push button switch. I stick of the bottom of the case four pieces of rubber which can be found on the bottom of a keyboard to increase the stability of my device.
Step 5: How It Works. The diode D1 rectifies mains voltage and charge the capacitor via the lamp (which limit the current). The lamp glows during the capacitor's charging. The light is diminishing as the capacitor is charging. When the capacitor is charged, the lamp is off. After few seconds the capacitor is charged and the light goes off. By pushing the S2 button, a pulse of high current (aprox 50 A) passes through the coil magnetizing the object placed inside the coil.
This process can be repeated. The magnetizer is simple, effective, made from salvanged parts. To understand better how it works look at the first two images, watch the video below and then view the other images.
You should really try it with a ferrite magnet, although I kindly doubt this setup can produce the H field required to fully magnetize it ( 900,000 A/m). Ferrite magnets are considered the easiest to magnetize among the generally available materials. There's a programm called FEMM (finite element method magnetics) which lets you simulate and calculate the minimum current, turns and solenoid size you need to produce the very strong field necessary to build a useful magnetizer that can revive ferrite magnets. Not that this device is useless, it's really a nice proof of concept, but any small magnet can successfully magnetize an iron nail. The real deal is to remagnetize high coercivity materials such as hard ferrite such as the common C5, C8 or Y30 grades. I am still angered at how many people have negatively criticised this project.
The author is a school student and this is only his second project. We all had to start somewhere.
Even if the capacitor is rated at 400V, it is never going to charge beyond the mains voltage of 220-240V. There are many un-earthed appliances that rely on plastic insulation to keep the electricity inside, among the most dangerous being hair dryers and hand-held kitchen mixers. Yet no one has mentioned just how dangerous my suggestion above would be! The capacitor, on average, is capable of holding 3kVDC maybe even as high as 5kVDC.
It would have to remain properly housed in the modified microwave oven just in case it exploded. The button to dump the capacitor into the magnetizing coil would have to be a very heavy industrial switch-if a 'domestic' switch did not start arcing almost immediately, the contacts would probably weld together into a short circuit on its very first use. If you must 'criticise', then please use the 'be nice' policy. Why would andreyeurope want to post a third project if it was only going to attract the same negative responses? Mr Treknology, please stop trying to teach when you obviously know very little about mains AC electricity. I have to be firm about this for everyone's safety, including yours.
Any home-built mains powered circuit should be checked by an electrician or properly qualified person for safety BEFORE it is connected to the mains supply. On 250 Volt AC mains, the capacitor will charge to 350 Volts. A capacitor must never be charged above its rated voltage. It is liable to explode.
But you are correct about the requirement for a high current switch. A fuse only protects the equipment, It surprises me that no one except me is saying just use an RCD, they trip with any earth leakage above 30mA (normally) General safely like make sure the wires you use are rated for the voltage, is just standard practice.
This protect (in my country) would run on 230V and CB's and fuses would be rated at 16amps, you would be dead many times over and they wouldn't even notice. At the end of the day most people on this site aren't electricians, we need to make sure these people are safe. RCD's is what you need.
Yes I saw the stirrer, great work there too, so I look forward to V2.0. Another covering idea for the magnet would be to smother it in bathroom sealant silicone - probably even more inert than hot glue? You could make a mould out of a biro tube or similar, pump it full of silicone, insert magnet, top up with more silicone and when set gently break out of the tube and trim. '.photos were taken with a smartphone camera.' Ah but if your video was taken using your smartphone too, then it's even easier to grab an image that captures that pulse spot-on. Just an idea if you need to capture a transient event.: ). The only 'Dangerous' thing I see here are all the comments putting down the Author.
I could point out MANY projects that have had a 'Teachers' insight and/or input. I should think that you've thrown out your cellphone, I-Pod/Pad and any other devices that require 5VDC chargers(as I've yet to see such a charger that has a fuse on/in it). And PLEASE don't tell me that you've NEVER replaced a burnt out lightbulb without making 100% sure that you've pulled the fuse from the MAINS panel or triped the Breaker on said MAINS panel! I couldn't POSSIBLY count the number projects that involve electricity and HOT GLUE; It holds fast when it returns to a Solid AND it does not conduct. 'fixed properly, items being thrown out'.the only thing I see being thrown out is your poor use of English; the word is 'Amend' not 'Amment'(please change the spelling of your criticism.' Before someone get hurt or worse'. The Author had a need and came to this site for help.
He/She was forced to look elsewhere and sought out a teacher who was able to assist. The Author then took that teaching and put it to use to complete the answer to the question asked. FIRST we get the Basic idea made into a working thing.THEN we see what can be done to make it Better. I don't see any Instructables under your Nick.lets see YOU do better.
The Instructable is simple, fairly safe(if ANYTHING is going to blow.it'll be the inline lamp!) and serves its task very well. I give the project 8/10! Actually, an insulated case can make things more dangerous. I know this sounds counter-intuitive.
Imagine if, somehow, electricity goes outside the box (a failure in one of the switches or a breakdown in your coil insulation, are two examples which come to mind). Then the electricity will sit there, waiting to choose the person as its path. A conductive housing which is connected to the mains ground is much safer. Of course, you should fuse the mains supply as well. Fuses are cheap and can be replaced.
There are no safety issues. The lamp limits the current through capacitor and coil. There are no shorts!
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No need for fuse. Even the capacitor fails, the lamp will glow normally. You can keep the device connected to mains indefinitely: the capacitor will stay charged until you push the discharge button. Ferromagnetic materials are in fact ATTRACTED to the center of the coil: they vibrate and stuck in the center.
Only magnets can be thrown outside or inside, regarding the alignment of the magnet poles.
This video has been labeled a 'Faux-To'. Commonly contested as bogus science, we believe this video to be a hoax. What's your opinion? Comment below. Regardless of what this is called, this free energy looks amazing when demonstrated. This video tutorial will show you how to make it. You can take a small electric motor from a children's toy and attach the wires to a battery to rotate the motor.
What you'll need to fire up a light bulb without a battery is the motor, a light bulb, a plastic lid, super glue, Scotch tape, three matches, magnets, and wire cutters. Never pay for electric again! Just imagine how much money you could save if you build a big version of the perpetual energy generator in this how-to video.
'magnets are more like storage capsules for electromagnetic energy' Not even close. Once an NdFeB 'rare earth' is produced, there is very little degradation of the magnetic force. It would take a very strong magnetic force, a good deal of heat, or a LOONNNGG time to demagnetize these magnets, and until then, they continually exert the same magnetic force. Very much unlike a battery. Electromagnets temporarily align the domains of a 'soft' ferromagnetic substance using a charged solenoid.
Actually he is correct. This will only last a few hundred hours. As opposed to the months you can get out of a AA battery. As the like poles exert force on one another they slowly start to align with one another.
The strength of the magnetic field drops off at an inverse logarithmic rate. Meaning for 75% of the magnets life you will see no change visible to human senses. After this point the field strength drops off at an ever increasing rate. Very much like a capacitor but for magnetism instead of electricity. I tried that, but it's really not as easy as this video makes it out to be. You must angle the magnets just so, or the magnet's opposite pole will attract the drive magnet( the car track magnet). I tried this for a science project this previous year, and very nearly didn't complete a project at all; it's catastrophic failure forced me to switch topics entirely.
I was extremely dissapointed with the way my version worked- or rather, failed to work. Perhaps I did it wrong; if so, I invite all who read this to correct me. Until then, it looks to me as though this video has been labeled a 'faux-to' for good reason.SIGH. I was not a doubter (indeed, I am a biology teacher) and as my physics is not too hot and since I thought it would be a great demonstration in class, I went out and bought a wide selection of magnets and motors of various sizes to test this out. All that happens is as people have said previously, the magnets rock a little back and fourth then they stop. Even if you spin the mechanism to give it power, it stops very quickly. I repeated this using different strength magnets and various motors and nothing happened.
I would love it to have worked and am pleased I tested it myself, rather than just nay saying. Another video would be great, or start selling the set up (with a guarantee) as I want to join the celebration, but otherwise. This would not work if the magnet was fixed in place rather than hand held, subtle, constant corrections of the proximity of magnets to one an other is required to keep this moving. You are converting muscular excretion to electricity. This is no big trick, I suspect a generator on a stationary bike would produce a better ratio of expended calories to watts generated. Wendy's handed out a toy with kids meals a few months ago that was essentially the same device; It was a toy monkey (Captain Huggy Face to be exact) with a round bottom that allowed it to spin like a top and a toy remote control. Each contained a small fixed magnet.
If you place Captain Huggy Face on a table and hold the remote near by, he spins in place. If you put the remote on table, nothing happens or they stick together. It is the subtle corrections made by your eye-brain-hand that keep the two parts of toy consistently the same distance apart which in turn keeps the monkey spinning.
You people are amusing. From 'China is mass producing them but big corporate bullies are keeping them down' (with no source mind you) to 'I built one years ago' (and yet didn't sell it despite the obvious fortune) this belief in perpetual motion is comical yet encouraging. This is a trick as the magnet would function more as a brake than anything else. The only way to possibly do this would be to move the handheld magnet to and from the wheel. Even then the proportional increase to make this a viable energy source is astronomical to an unrealistic degree. Don't stop dreaming though because, who knows, maybe one day you'll defy the Laws of Physics and the world will be a wonderful place.
Nice video and nice presentation, but com'on guys and gals. This is just not what it appears to be. No different than a magic trick, once you see how its done, then you get the 'duh' results.
The best observations above are the person(s) who said there is a coil or magnet pulsing source below the table. There are a few laws that are broken here. Conservation of Energy. Incredible claims deserve incredible proof. It is up to the presenter to prove it, not the observers.
Basic kindergarten science. This is cute and fun, but don't fall for it. This has been tried for centuries by some very smart peeps and all, ALL, have failed, even on a microscopic level. I don't want to discourage open thought, but please don't take this persons 'trick' video as science If you believe it, then prove it for your self before you proclaim this as real science breakthrough. Uhh under the table? Are you guys retarted?
Simple freehand magnet moving on a disc- like seriously, youre gonna tell me this person bothered creating another one powered by a battery and stuck it under that thick table and tell me that those other magnets are close enough to affect the ones on top? Yo that sounds like a poor explanation, besides the disc spun first clockwise before going counterclockwise in correspondance to how the magnet was held in his hand in the first place. Now unless you somehow prove to me that he intentionally made a 2nd one powered by battery and intentionally tweaked so it would turn clockwise first. Now we're going overboard. Do your friggin homework and google nikola tesla. Now if you wanna go into it deeper google torsion fields or hyperdimensional physics.
Electric Tool Magnetizer
Don't be so naiive as to think anyone who governs you would let you have hold of free energy ( thats way too optimistic and you know it). It's not as much as this 'new' science(actually its pretty damn old) has been avoiding us, but in fact kept from us on a global media scale(because whoever controls media controls group thought). Long story made short. Education and particularily life as we know was designed this way, it didnt evolve this way on its own. We are just human resource afterall.
Other fields you skepticals should examine: Cymatics, quantum physics and sacred geometry. Oh yeah, it's all a conspiracy. Tell you what genious. Make yourself a working model of this and be insanely rich. Torsion fields and hyperdimensional physics and nikola tesla?
Do you even have a clue on what you're talking about? Sacred geometry? LOL FFS you dolts, if you can make it work do it and win a huge fortune or are 'The Man' keeping you down? Torsion fields. A hoax exposed in the 90s. That has zero to do with this! Hyperdimensional physics by other no other than Richard C.
Hoagland, a retard who claims advanced civilizations exist or once existed on the moon. Plus you even fail at reading.
The guy here simply powered an electric engine with a battery and that created the motion, not the magnets. Look at the speed, it's exactly the speed of the engine he showed in the first place. He doesn't have to have a second set of magnets under the table. All the needs is to connect the wires to a power source, and that is why he doesn't take the wires of the engine.
They are there to hide the fact that the mechanism is externally powered. Now you cookoo heads can just prove you're right (and Physicists are wrong) just by making a commercial application of this. Just Patent a thing like this and you'll make billions. Instead you make silly videos?! Don't you think that it is a little bit 'retarded' to think that something like this would just go under the radar of big corporations? Start using your brain, no need to wrap it in tin foil either! Torsion fields are a hoax D:?
Dude there is even an official Torsion field GRID for our planet and VISIBLE evidence of it on every planet of our solar system (every huge detectabe anomaly 19.5 degrees either south or north from the center of the planet) Yo man you're out of date. Torsion fields is just another name for hyperdimensional physics (picked up first by nickola tesli, and from which einstein had commented on himself as the new newton revolution). And god, study some history, pull your head out of your ass and go research what I said. As for sacred geometry it goes hand in hand with cymatics which I assume you have no idea what it is. Oh another subject I suggest researching which is DMT and the Pineal gland.
I watched over 200 hours of documentaries in the last 4 months. I'm not about to say all of it is true and that I understand all of it from pure firsthand experience but I can certainly say this: A true researcher will look at everything, even if it seems balooney and bogus. The point is to have a bigger picture, not to select your information. So next time you watch those educational videos and conspiracy theorists that you dont like, how bout watching it fully and not stopping after 5 minutes, eh? OMG you're a complete utter tin foil lunatic. Nothing of what you said has actually been proven to exist and/or work. ' I watched over 200 hours of documentaries in the last 4 months.
' Imagine that, instead of wasting 200 hours seeing semi-retarded pseudo-science TV shows you'd actually studied a physics book and learn why all that BS is fake to lure in stupid people to buy #$%@. 'A true researcher will look at everything, even if it seems balooney and bogus.' Absolutely, and then a true researcher will be able to separate idiotic mumbo-jumbo from reality.
You only need to go a step further. 'So next time you watch those educational videos and conspiracy theorists that you dont like, how bout watching it fully and not stopping after 5 minutes, eh?' Dude, why do you think i'm here in this specific topic? I have as an hobby to cruise around and check out these stories and see if there is something i'm missing out on. Then i analyze their merits. All the stuff you mentioned has been done in to death. And quite honestly i could school you in sacred geometry.
I've studied that BS well beyond the point of seeing it was all BS just for the fun of it. And the only reason why you think cymatics and this go hand to hand is because you haven't really comprehended why those geometric connections exist. 'Torsion fields is just another name for hyperdimensional physics (picked up first by nickola tesli, and from which einstein had commented on himself as the new newton revolution).' Apparently we are still waiting for this revolution huh? And since You're talking about Einstein who was dead wrong on Quantum Mechanics and was himself outdated when he died and you call me 'outdated'? Have you even held a post 1950 physics book? Torsion fields, if you can comprehend what they are, do exist, but that's about it.
All the work done on them is BS. Torsion fields have basically zero interaction in our world.
I was talking about the crap you've certainly heard about it being Reply. 'I know I have the responsibility to share what I know ' Well, so far all you've shared was a visible vulnerability to hoaxes. ' I think you're just downright annoying for a human being.' Yeah, i know, reality really bites when you try so hard to believe in fairy tales. Guess what, i don't really care if you think i'm annoying because i don't believe in BS that has never been proven.
It's that easy. You think this contraption works? Build one, make electric power out of it forever and be a billionaire. Who is stopping you and everyone who says this works? Only one the thing i can remember. Cold hard reality and those damn physical laws.
'I just don't think you deserve to have your curiosity satied when you are trying to eliminate other people's argument's without having done a thorough research.' I've done physicis and chemistry at university level.
I'm a Biology teacher. I've done more research and been around labs for years, unlike half these mofos here supporting that this works.
I'm basically inside the scientific field. Which means that i know that if someone had something amazing to show the scientific community he would. All these people saying that somehow mainstream science are keeping them down don't have a clue.
Best obd2 performance chip. The only thing that keeps them down is the necessity to actually 'demonstrate' their work. Every one of these perpetual motion machines fail as soon as independent review is done. They are hoaxes in search for investment.
Now, i'm not saying that a new form of energy that is super efficient and will save us from oil will not come around. I hope it will. But these machines in violation of the conservation of energy aren't it. 'I know I have the responsibility to share what I know ' Well, so far all you've shared was a visible vulnerability to hoaxes. ' I think you're just downright annoying for a human being.'
Yeah, i know, reality really bites when you try so hard to believe in fairy tales. Guess what, i don't really care if you think i'm annoying because i don't believe in BS that has never been proven. It's that easy. You think this contraption works? Build one, make electric power out of it forever and be a billionaire.
Who is stopping you and everyone who says this works? Only one the thing i can remember.
Diy Magnetizer
Cold hard reality and those damn physical laws. 'I just don't think you deserve to have your curiosity satied when you are trying to eliminate other people's argument's without having done a thorough research.' I've done physicis and chemistry at university level. I'm a Biology teacher. I've done more research and been around labs for years, unlike half these mofos here supporting that this works.
I'm basically inside the scientific field. Which means that i know that if someone had something amazing to show the scientific community he would. All these people saying that somehow mainstream science are keeping them down don't have a clue. The only thing that keeps them down is the necessity to actually 'demonstrate' their work.
Every one of these perpetual motion machines fail as soon as independent review is done. They are hoaxes in search for investment. Now, i'm not saying that a new form of energy that is super efficient and will save us from oil will not come around. I hope it will.
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But these machines in violation of the conservation of energy aren't it. 'The good thing about this is how easy it is to build, so instead of saying how you know it doesn't work cause some law u where taught in some old book. Test things for urself. ' Ok, you build one of these then, in order to test it yourself. You call out on others to test, but if you had done it yourself you would have seen that this device cannot work like it is shown at all.
'how naive to belive things just cause you read them somewhere in school.' As opposed to believing in stuff you see on the internet on an anonymous video? ANSWER/SOLUTION: he's was performing WORK (force.distance=energy stored) when he brought the magnet (magnetic field) with his hand close to those small magnets that are repelling him as he brings it closer. Think of it like waterfall spinning turbines in a hydro-electric plant.
The potential energy was originally required to raise water to that height is then released as kinetic energy. Here he is using the force of his hand to create potential energy (like loading a SPRING). Because the repulsive force is small, it's not 'obvious.' But he won't be able to bring a huge magnet close like that to a replica x1000 scale:). I guess we can't blame Jack Stappers. Who knows what kind of psychological damage could be incurred from 200 hours of conspiracy theory.
Just a few things to point out though: -first law of thermodynamics says we can't create energy.second law of thermodynamics says we can never have a 100% efficient machine.Magnetic fields do no work.Einstein isn't on your side. He spent the first part of his scientific career debunking perpetual motion machines as a patent clerk in Switzerland.Really, why don't you build one of these and become the next Nobel prize for physics? Or does Sweden not have the correct fields for this machine to function?
-Sometimes the majority is right - and not because they're the majority of course, but because they believe in rationally proven concepts based on evidence and extensive (peer reviewed) mathematical proofs. I have an electrical generator which has a 15,000 WATT output.
It powers itself. It doesn't need any type of fuel such as gasoline, diesel, propane, natural gas, solar power, or aquatics.
All it needs is an AC battery to start it,? And once it is started it keeps itself running. Most small houses only need about 7,500 WATTS.
My invention will power a whole house. The applications are truly endless! I hope to one day to be able to give this device to the poor not living near an electrical grid.
Simple to build Magnet Charger.Two batteries in series May work evan better.Be careful if trying.I have only tried one 12V car battery so far & it used 25 Amps.Did the job OK on that.A welding machine can also be used.This was used on a Lucas ML CK1 1923 Magneto.It has two magnets in it & lost 50% of its power after I stripped it down to repair.Next video it gets a hand spun test.This is a ML CK1 rotating clockwise looking at it from the pionts end or anticlock wise from the drive end.Also I put the Stator in a spot like in the mud drawing as I think that may perhaps helps.
The magnet is in an aluminum casting bolted to the cast iron flywheel. Kohler will not sell the magnet without the flywheel.450.00!!!!!!!! How can I remagnitize the magnet?The simple answer is, you won't be able to remagnetize it. The more accurate answer is, you actually could, but the electromagnet you would have to build in order to supply the over 60,000 Amp-turns needed to remagnetize an alnico magnet would weigh about 250 lbs. Just the cost of the iron and copper in the magnet would be several hundred dollars. However, if you google shops that work on magnetos, one of them should have the necessary electromagnet (most won't, so you'll have to look around).
The actual process couldn't be simpler. They install your rotor, adjust the pole pieces, run the current up and back down, and a few seconds later it's ready to ship it back to you. Since you say the magnet is bolted on, for that kind of money I would unbolt it and try to replace the magnet. You may need to check for polarity (North South) on a replacement magnet. I don't know if this would make a difference but it could reverse the induced current flow and I suppose that could have an effect on you point capacitor or something.
I'm not sure where you might find a replacement magnet but it seems like most anything would work better then spending all that money for a whole new flywheel. You might be able to get one from a motor shop that has a junked engine. Some claim you can re-magnetize a magnet by rubbing it with a powerful neodymium magnet. Worth a shot.
If not, maybe you could machine a recess for a small neodymium, compared to old iron magnets they are immensely powerful so even a small one should work.Unfortunately, the 'B-H curve' of a magnet is such that it isn't possible to remagnetize an alnico magnet this way. However, the B-H curve isn't symmetric, which means it.is. possible to demagnetize it, so keep your neodymium magnets away from this. The original poster did just what he needed to do, and found someone with an appropriate electromagnet. I have magnetized many magnets, mostly field magnets in tachometer generators but on occasion outboard motor magnets similar to the one described and a few antique motorcycle magnetos. It doesn't require anything like 250 pounds of iron. You make a core that has a greater cross sectional area than the magnet so it will carry the magnetic lines of force to saturate the magnet and the minimum length required to join its poles.
The RFL magnetizer I used in the local GE shop just had a single buss bar that went through the space between the core and the center of the magnet. The magnetizer had a capacitor that was charged to 600V and discharged by an ignitron through the buss bar. Later I made my own using 66,000 mfd charged to 150V and discharged by a size 4 contactor. Both these systems generate a huge current pulse that only has to persist for milliseconds to align the magnetic domains.
The core I made for GE 5PY59 tach generators had three turns of 4 ga wire around it and a hole for the shaft on the armature. After I magnetized it, I used the armature to push the core out so that there was always a complete magnetic path, preserving the magnetism. By bumping the field up to near saturation, the output of the generator would too high. Then I ran it at a constant RPM and waved a magnetron magnet past it to bring the output down.
I was able to calibrate them closer than the GE factory. You can remagnetize an alnico magnet with a stronger one. Tapping it with the magnetism applied helps. You can also demagnetize or reverse ceramic magnets, but they don't like to be changed to to a different axis. I probably should not say this, because I wouldn't want anyone else to try it, but in an emergency I have run a jumper cable through the gap and banged it across a 12V car battery. Perhaps not very smart, but it worked. Bill Last edited by 9100; at 09:35 PM.
Reason: addition. The RFL magnetizer I used in the local GE shop just had a single buss bar that went through the space between the core and the center of the magnet. The magnetizer had a capacitor that was charged to 600V and discharged by an ignitron through the buss bar. Later I made my own using 66,000 mfd charged to 150V and discharged by a size 4 contactor. Both these systems generate a huge current pulse that only has to persist for milliseconds to align the magnetic domains.Yes, you can trade high voltage for smaller amounts of iron and steel.
But, instead of paying for the metal (which is relatively inexpensive), you pay for the 600 V power supply (which typically is more expensive). I agree that it only requies a very short pulse to accomplish the remagnetization, although there's no harm in applying a field for longer. You can remagnetize an alnico magnet with a stronger one.
Tapping it with the magnetism applied helps. We're just going to disagree on remagnetizing an alnico magnet with a stronger one. It's physically impossible (B-H curve). I should add, though, if the alnico you're working with has been largely demagnetized, you can recover some of the magnetism using a stronger magnet, so this is likely the effect you saw. You just won't be able to get to even half its properly magnetized value. Also, tapping it with a magnet does no good whatever.
The domains either have enough magnetic force on them to reverse, or they don't, and the mechanical force imparted by tapping is negligible compared to the forces required. Tapping the magnet while an old magneto was on the charger was something people were told to do in automotive books of a half-century ago, and the incorrect thought that it does some good persists with many people to this day. I just got back from the local UPS store.
I sent the magnet to McWhorter's antique Iron repair. They rebuild and restore about 25 brands of magnetos, mostly from old tractors and stationary engines and have the bit of kit to recharge my magnet. They will do it the same day and send it right back. I am told it will be as good or better than new and will last many years.
When it returns I will report back.Well I got the magnet back on Saturday and bolted it on. Cranked it over.
Nice hot bright blue spark on both plug wires. I put it all back together, runs great. 15.00 to re charge the magnet, or or over 400.00 for a new flywheel. Not a hard decision to make. It is very easy to re-energize a magnet. You need to make a coil of wire with about 1000 turns of #24 enamel coated copper wire.
Get 1 or 2 large electrolitic capacitors. I am using 2 capacitors 7400 mfd 200 vdc each in parallel. I have a bridge rectifier connected to 120 vac to get 170 vdc to charge the capacitors.
Manufacturing process by rs khurmi pdf viewer. When the capacitors are charged, I disc charge them into the coil. The tiny magnet in the picture will lift 1/2 lbs of steel. After recharging the magnet it will lift about 300 lbs for 2 seconds. Magnets have a half life of about 2.5 seconds.
After 2 seconds 300 lbs drops to 150 lbs, then 75, then 37, then 18, 9, 4, 2, 1, etc. It takes about 15 seconds for the magnet too loose the super charge and return to almost normal.
A magnet levels off and holds at a steady power rating for a long time but even then it is always loosing power that is why OLD magnets get weak. This device will restore a magnet as good as new. I have an old antique telephone generator I recharged the U magnets on it. I recharged the magnet on an old antique engine. I have a lot of fun experementing with things. I can reverse the magnet field on a magnet too. With a special set of coils I can put 2 to 6 North Poles and south poles on the same magnet or I can switch the poles from the ends to the sides of the magnet and back again.
It's interesting to read this thread and contrast the general technical opinion (which is correct) with the anecdotal (which is not incorrect). The OP wanted to fix his magneto so he sent the magnets it off to a place that had the right equipment to fix his magnets whereas the anecdotal references talk about ' did this magnet,' 'did that magnet' without the specifics about magnetic field strength attained. There are several interesting tutorials and descriptions of magnetic hysteresis that show distinctly the general problem of trying to remagnetize a previoulsy strong magnet with not enough juice.
The question will always revolve around how strong. Cheers, Rich. It's interesting to read this thread and contrast the general technical opinion (which is correct) with the anecdotal (which is not incorrect). The OP wanted to fix his magneto so he sent the magnets it off to a place that had the right equipment to fix his magnets whereas the anecdotal references talk about ' did this magnet,' 'did that magnet' without the specifics about magnetic field strength attained. There are several interesting tutorials and descriptions of magnetic hysteresis that show distinctly the general problem of trying to remagnetize a previoulsy strong magnet with not enough juice. The question will always revolve around how strong.
Cheers, Rich Very well said. Opscimc - lots of us appreciate good info like you provided. I had no gauss meter to check the magnet with so before I sent the magnet I tried to pick up different sizes of wrench. Before sending it to be recharged it would just pick up a 7/16 wrench, it will now pick up a 15/16. I have never seen a magnet on a small engine flywheel go bad before. I do have a dial indicator magnetic base that came with a piece of steel that was supposed to be kept on it to prevent loss of magnetism. If you buy a new rotor for the alternator on a 60s and 70s Triumph, BSA, or Norton motorcycle it comes with 2 steel bits, each wrapped half way around it.
The engine had no spark, and did not run. The only change was to recharge the magnet.
Now it has spark and runs. I have one question. I have worked with small engines that use flywheel magnets and magnetos for at least 40 years and have not run across a magnet that became weak and couldn't produce a spark for the ignition. Have I been lucky or is 40 years not long enough?
Most people don't have a magnetometer so have no way to determine if their magnets have lost strength, and by how much. Also, I'd wager the output of a stator on a British motorcycle could slowly drop over the years from 120 W to 60 W and most owners would never notice, nor have the knowledge and tools required to measure it. Heat and shock are the enemies of magnets. Although under typical conditions an alnico magnet will outlast whatever it is attached to, it is possible to defeat it by untypical methods, like pounding with a hammer to loosen it from a tapered shaft. Also, it's possible the OP's system uses the field to generate a trigger signal as well as the spark energy, and a reduced field fell below the threshold needed to trigger the spark.
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