It looks like that may have been the inspiration for this build, and the finished product appears to be a tad more useful this time. A shallow dish is fabricated out of steel and the magnets are welded in place. With the primaries wired together, the magnets are epoxy potted, the business end is faced off cleanly, and the whole thing put to the test. You can wind arbitrarily many turns in a coil and create ridiculous magnetic fields, but the series resistance grows to the point that adding more turns decreases the current and diminishes the field.
If I remember right Edmund sold a one ton lift magnet that would work with one dry cell. It was about 3 to 4 inches in diameter and half as thick with a single piece of iron with a circular groove for the coil. I saw a similar magnet lift a car at the Museum of Science and Industry in Chicago decades ago.
The trick is perfect flat coupling to a thick flat piece on the load. No electricity involved. The kg version has a bigger handle :. Colin Furze has made magnetic shoes using same transformers two years ago:.
Does matter since he runs it on DC, even so the lamination are already welded at the factory, its how the transformer is assembled. I love the concept and the build. But does potting with epoxy resin have enough strength to hold magnets in place? I did not see any mechanical fastners holding magnets in place. If epoxy cracks I see magnets pulling out of metal bracket and failure.
Over to someone with engineering experience please. He welded the base of the magnets to the plate that is hold directly to the crane with a hook. Look again. The sole purpose of the epoxy would be to keep the coils mounted to the cores as well as keeping them free of damaging debris that would short the coils.
The only force the epoxy sees is from the eddy currents trying to push the coils away from the core or vice-versa. Not impossible, but it would take a catastrophic failure. Dude routinely welds wearing shorts and flip flops. Not saying he should do any of this, but there it is. Anyone know a good source of information for dummies on electromagnet math? How do they work? One possibility on contactors is to have a split pole with a copper ring one one half.The ElectronCommander.
Search this site. How to wire up a Microwave transformer. Mains voltage arcs. Mains wiring. One thing about microwave transformers is that without a ballast, MOT's draw high amounts of current, in the 30 amperes range if using volt mains.
This can trip the breaker It happened to me. We will talk about how to fix that later. For now, to hook up the MOT, get a power cord and strip off the end, exposing the live and neutral wires. There is no polarity because this is alternating current. Solder the wires to the AC input terminals. Use a TON of solder, because we are dealing with high currents. This is how it should look like:.
As I said in the previous section, MOT's use a lot of current. To fix that problem, we use what is called a ballast. Of course, it is not as simple as putting a resistor in series with the input, it would burn out. Instead, we use something like a heater in series with the input. The ballast can be anything that runs on wall power. Here are some arcs with a watt heater as a ballast. They look decent.I need a replacement for my homebrew z single tube amp. I only used it for low power AM and I don't need "maximum voltage".
Are they center taped or just a single coil? You would have to switch the primary to prevent overheating when you aren't transmitting. Michael A. Regards, John -- I would like to point out, I do appreciate the "Been there--done that! Indeed, now your observations, comments and discourse should be filled with wisdom--I am listening!!! This has been discussed on the various sci. What are the problems? I would go down to the garage and chisel away at them every couple of day, but I finally gave up.
My intended use was a hi current Typically the magnetic shunt consists of two extra blocks of laminations between the primary and secondary bobbins.
This has been added to give the transformer a current-limiting characteristic, which is necessary to power a magnetron - but is exactly the opposite of what you need for normal vacuum tubes. In many oven transformers, the magnetic shunt blocks can be driven out with a large punch, to leave a more normal-looking transformer.
The not-so-good news is that you're still left with a transformer that has a very high secondary voltage and rather high secondary resistance, which will give poor voltage regulation in typical amateur use.
Also one end of the secondary winding is usually grounded to the core. Even if you can get to the grounded end to disconnect it, the insulation close to the core is not designed for typical full-wave bridge applications. Some people have had limited success with a pair of identical transformers connected as a "centre-tapped" winding It all seems like a lot of effort for rather poor results. I trust your move has been successful. Top Microwave Oven Transformers Specifications.
Well, not quite, not yet. Still in the process of selling up down south, and doing what work we can on the new place in Scotland.
Thank goodness for jet-lag, and an excuse to take it easy for a few days.Lichtenberg figures in wood are made through a fun, lethal process! Lichtenberg figure is a general term for such figures made by high power electricity passing through wood, grass, glass or whatever, where the electricity can leave an impression.
They look like a tree and its branches grown in hell! To make the figures on a wood:. Now to make high voltage, the easiest way is to use a transformer you can scavenge from old or broken microwave ovens.
How to Test a High Voltage Transformer
Quite dangerous and exposed, so be very careful. Transformers are in general used to change the voltage and current levels between the input and output. The active power is what does the actual work such as generating heat. Of course there are other factors in real life that waste power such as winding wire resistances, transformer core losses and such.
But at least at no load we have the following equation:. Also there is another useful equation to calculate the number of turns ratio if you can measure the inductance. Since the windings are both on the same core, the following equation provides relation between number of turns Nx and the inductance of primary and secondary Lx :. As mentioned in the video, any inductor results in a current lag, resulting in 90 degrees phase shift in an ideal inductor as shown in the picture below.
At any moment of time power is equal to voltage times current.
Red Wave Radio
But as you see in the following picture, in some areas the power would be positive and in others negative depending on the voltage and current direction. This means although when power is positive, the inductor pulls power from the supply, it puts the same amount of power back into the AC supply when the power is negative.
So in every transformer there is always some amount of current running into the primary depending on the impedance of primary and loading even if there is no load connected to the adapter. If there is any power drawn from the transformer, the phase shift is not 90 degrees any more and becomes less.
Rewind a Microwave Oven Transformer
So there is more power drawn from the source than the power returned to supply. Now all inductor windings and power line wires have some small resistance and the transformers have their core losses. This means that this amount of current would generate some heat over resistive elements and such.
So the sooner you switch to switch-mode wall adapters,the better! By any chance, could you possibly put it as a video on Twitter or something similar? I hope that you can read this and put a video on Twitter or Instagram. Hi I only want to know, how much voltage is need to make for lichtenberg figure Electron Tree on the plastic glass.
Thank you. Hi there. In the link below is a strange thing about fractal wood burning with a car battery. Hi, thank you very much for your good stuff. I have a question, what is the best wood for this art? Hi I build a burner out of a old neon sign transformer. I know my connections are good on the primary side. Because I put a light in series in the circuit. I also used old baking soda out of the fridge as well as plywood two different kinds.The microwave oven transformer is possibly one of the simplest methods of making some big high voltage arcs, mainly because they are robust, cheap, and easy to hook up.
To the bottom left I have a picture of an MOT. The mains input is two blade connectors on the primary coil thick wire. But where does the 2,V come out? Well, the HV output is a single blade connector on the secondary coil. It usually puts out around 2,V at 1 amp 2, watts ; certainly more than enough to kill you, so… DO NOT make contact with the high voltage!
MOTs are a mass produced item and these days quantity is more important than quality. Because of this, they are designed with as little iron as possible and drawing an arc often saturates the core. Once a transformer is saturated it starts to draw a lot of extra amps; amps that do not make it to the secondary coil, but instead are wasted as heat. To prevent excessive current draw MOTs are usually ballasted, and this can be accomplished a couple different ways.
By far the simplest method is just to use a long wire wrapped around some steel rods. An alternate ballasting option is to use another MOT an a series inductor. The one with the shorted secondary becomes a high current inductor, perfect for ballasting another MOT. It certainly adds a lot of weight though…. A third method of ballasting MOTs is to use a resistive ballast. Halogen lamps the big W work lamp kind make pretty good resistive ballasts. Of course if you have a 30 amp circuit you can always just hook the MOT directly to the mains and pull some mean unballasted arcs!BEST Microwave Oven Transformer-MOT Rewinding Tutorial
Since MOTs are nothing but copper and iron they can be modified a couple different ways. One such modification is to knock out the magnetic shunts. If you want more current out of the HV side for some reason you can knock out these shunts using a hammer and a chisel. Another possible modification is to turn the MOT into a nice low voltage high current transformer, and I discuss that in detail on this page. Some sites and videos found on You Tube seem to make it sound sooo difficult.
So it would be work for my amplifier plays some music for at least a couple of continuos hours? Hi Adam! I am a first timer at this website. I really am into electrical items of all types, but especially seeing arcs of all kinds come from high voltage wires.
The MOT transformer interested me here because of how simple it was to do your own custom high voltage with it. Some MOTs have different high amperages used through the outlet. Can this also have to do with the design of the MOT too? And lastly, what does in electrical terms un ballasted and ballasted mean?A typical output voltage is 2kVeff, at around W power. This is equivalent to about 0. The short-circuit current is even higher. Transformer from microwave oven. Primary winding lower, thick wire V, secondary winding upper, thin wire 2kV.
The few turns of very thick wire wound on top of the secondary supply about 3V at a few A to the magnetron filament.
And as an arc is pretty much a short-circuit for the secondary winding, the output current should be externally limited for the purpose of drawing arcs. This can be done by inserting a resistive or inductive load into the primary or secondary circuit, see figure. When using a transformer e. Without current limiting, chances are good that the mains fuse will blow when drawing an arc.
With or without current limiting, the secondary will probably overheat when arcing takes place over long time. In spite of not being noticeably current limited, with all MOTs I've tested so far I could draw an arc without the fuse blowing, but the winding heats up within seconds!
When connecting a MOT to the mains i. This may be enough to blow the fuse. This problem can be avoided by using a so-called switch-on current limiting circuit, see figure. Such a circuit is used in all microwave ovens and should be saved as well when cannibalizing such a device. After switch-on, the resistor limits the current to a sensible value for the short time the relay needs to switch.
Correct grounding is important with MOTs.
The inner end of the secondary, which is near to the core, should be connected to the iron core. In many MOTs, this is already the case. The reason is that the insulation between core and winding is usually insufficient to withstand the full output voltage. Only two MOTs can be used for double output voltage, when the cores are connected and the primaries anti-parallel, see figure below.A new clean ubiquitous renewable energy model indirectly microwave oven transformers how to turn a microwave oven transformer into high microwave oven parts w transformer for product on alibaba opening a winsson 62 transformer r x seger hv.
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