Mot inductor

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Mot inductor

Hello everyone, I am looking to get some advise. I am building a Tesla coil and cant really get any transformers other than MOT. I have four MOT with all their other components Capacitors. If anyone out there can give me some detailed advise it will be great. I just started the build so pictures are coming soon. Thanks in advance to you all.

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Thats about it. You can get even more bang for your buck by using all four of your transformers or jus make a voltage quadrupler with the MOT capacitors and the diodes four mots will give you total of 8kv ,more than enough for a 4"-6" coil. You could use just one mot to make the tesla coil. I know because 3 days ago I made my first tesla coil and it used a mot. The mot was powered with 12 volts. My coil is only 8 cm high and 4 cm around. You could pull an arc like 1. It's really cool.

First off, if you want to use all 4 mots, make sure they all have similar ratings. This meathod is very inefficient. Typically people use a MOT that has the secondary HV removed and hook up the primary in series with all of the other transformers. Lastly, make sure that you will be able to power this thing!

The average household circuit can power a max of watts, this can usually only power 1 maybe 2 mots. So keep this in mind. Needless to say, careful with those things, they can kill you 10x over!

Reply 10 years ago. Thanks for the info, I guess the MOT idea is not going to work after all. Well guess I gotta look for something else to power this up. Ignition coils!In the video below, it only takes a few seconds to heat a screwdriver up to a temperature that will melt solder. The actual solder pot is made out of steel conduit wrapped with aerogel-infused fiberglass insulation.

mot inductor

Compared to his old solder pot, this machine heats up instantly, and is more than capable of wetting a few wire connections. The future plan for this inductive heater is to make a few more attachments for different metals, and a [Proto G] has a few aerogel blankets he could use to make some small metal castings. However, to give [Proto G] some credit, he has been building the heating vessels himself.

He provides the link to Amazon where he bought the thing, why is this presented as him building it? The point of the youtube series is to show others the many practical uses for inductive heat. I am making all of the attachments myself and explaining how they work. The coils that come with the unit are inefficient and I explained why in the second video.

What is you level of understading of this board, how difficult would it be to control the out put of it based on temperature, or wattage? The ZVS driver is actually the least expensive part of the whole setup.

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How so? If you saw my other videos you would see that coil design plays more of an important role in this heater than the ZVS driver does. I design antennas professionally and have worked at NASA. The ZVS driver consists of 4 different components. It requires no knowledge or skill to build one from scratch, unlike a digital clock. How am I like Ahmed again? It draws 6A at 48V.

Nope, it draws 6A with no load. I have ran it up to 23A at 48V. The power supply is pulling Watts from the VAC outlet when a large load is introduced. I have it hooked up to a power meter. My bad. Or not.

mot inductor

Those two toroids provide magnetic containment for the self-sustaining fusion reaction that enables this thing to put out 1kW with only W in. What look like capacitors are actually hydrogen fuel cells. Perhaps these were rejects from the Shanghai maglev train.

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It draws a lower current with no load and when he adds a load inside the primary coil e. The machine will only run for about 1 minutes at a time anyway because the insulation is effectively keeping the solder in a liquid state for up to an hour after the power has been removed. Says Rod, whilst polishing his mirror. Great story but Who changed the pronunciation from solder to souder?!? I have happened to build a couple of powerful ZVS circuits and used some of them for induction heating.

mot inductor

The capacitors that were used were the ones that came with the pre-made board. Actually, if you look closely at some of the AliExpress photos, you can see that the capacitors are standard 0. You could also use the coil for induction reflow soldering, though perhaps only for sturdy stuff like connectors rather than delicate components that it might fry.

Has anyone here tried it?Use the advanced search below. An inductor is a current filtering device. By resisting change in current, the filter inductor essentially accumulates stored energy as an AC current crests each cycle, and releases that energy as it minimizes. Power inductors require the presence of an air gap within the core structure. The purpose of the gap is to store the energy, and to prevent the core from saturating under load. Another way to express the function of the air gap is to say that it reduces and controls the effective permeability of the magnetic structure.

One envelope constraint is that Bsat is not widely variable. The physics of soft magnetic materials result in the case that commericially useful materials range from about 0. The power inductor gap may be realized in one of two fashions, discrete or distributed.

At a microscopic level, magnetic alloy powder grains are separated from one another by binder insulation or by high temperature insulation coating each grain. This is not at the magnetic domain level; domains are vastly smaller than powder core grains.

Distributing the gap throughout the powder core structure serves two main purposes: 1 eliminating the disadvantages of a discrete gap structure, which are sharp saturation, fringing loss,and EMI, and 2 controlling eddy current losses so that higher Bsat alloys may be used at relatively high frequencies, despite comparatively low bulk resistivity in the alloy.

The main performance advantage of ferrite is low AC core loss at high frequency, due to high material resistivity in the ceramic material, compared with metal alloys.

mot inductor

Ferrites are at the low end of the available range for Bsat, and they shift down in Bsat significantly with increasing temperature.

The discrete gap structure results in an inductor that reaches a sharp saturation point, requiring lots of headroom in the design. Discrete gaps also result in inductors that are vulnerable to eddy current losses in the coil due to fringing, and to generating EMI. Discrete gaps are also used in amorphous and nanocrystalline tape wound cut cores, which have improved AC loss performance compared with powder cores, but often at a cost disadvantage.

The inductor designer must meet the energy storage inductance requirement, as well as requirements for total loss, space, cost, EMI, fault-tolerance, temperature performance, and reliability. In the many cases powder cores have the clear advantage.

Then the designer has a variety of options in choosing among the powder cores. MPP toroids are available from 3. In other words, higher Bsat translates into best inductance stability least shift under high DC bias or high AC peak current. It is designed to be a practical alternative when iron powder is too lossy, typically because the frequency is moderate or high, but MPP is too expensive. It is designed to be an alternative when iron powder is too lossy or lacking DC Bias, or where the nickel alloys are too expensive or lack DC bias.

In addition to toroids, XFlux is available in E-core, U core and block shapes, so that winding costs may be minimized as well. Iron powder is often the best choice for a power inductor when the highest efficiency and smallest size are not required, but cost is critical; or when the frequency is quite low; or when the amplitude of the AC ripple current is very low resulting in very low AC flux, and thus reasonably low AC losses.Learn something new every day More Info An induction motor is a motor that provides power.

It owes its name to the way it operates. Alternating current AC voltages are induced by the magnetic and rotating field of the stator in the rotor circuit. An induction motor is constructed with elements of coppersteel, and aluminum. While this makes them more expensive than universal motors, it also increases their quality and durability. The construction of an induction motor is almost identical to the construction of a three-phase synchronous motor.

It consists of a rotor that is manufactured from a laminate cylinder with a slotted surface. The windings in these slots can be one of three types: a squirrel-cage winding, a slip ring rotor, or a solid core rotor. A squirrel-cage winding is made of copper bars that span the length of the rotor.

They are connected at each end through a ring. The rotor bars are skewed and not straight in order to reduce noise. Slip-ring rotors do not contain the bars found in squirrel-cage rotors.

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Instead, they contain windings that are connected to slip rings. If the slip rings are shortened, it causes the rotor to behave much in the same way as squirrel-cage rotors. Solid-core rotors induce the current needed to rotate and are made from solid steel. Inductor motors are slower than universal motors and have a lower start-up torque.

The speed of the motor is controlled by the number of windings in their stator and by the supply of voltage. In order to induce voltage, the speeds of the rotor and the rotating magnetic field in the stator must differ; otherwise, the magnetic field will not move relative to the rotor and no voltage or current will be induced.

Their slower speed contributes to their longevity as well as their consistent and reliable use. They are not prone to out as universal motors are.

Induction motors also are usually very quiet. Almost all table saws are fitted with an induction motor. The appropriate size motor depends on the saw. While smaller saws would use a motor between 1 and 5 horsepowerlarger saws need fan-cooled induction motors.Three coils A, B and C wound on a common magnetic circuit are shown in Figure 1.

The sense of winding is shown in the figure. The terminals are marked, arbitrarily on the coils. Let us consider that a current I A enters terminal A 1.

Looking from top, the current encircles the core counter-clockwise. According to corkscrew rule the flux is directed upwards through the coil. The flux through the core is directed clockwise through the core. A dot is placed quite arbitrarily at terminal A 1. This can be done for any coil. Once the dot is placed on one coil, dots on the terminals of other remaining coils cannot be placed arbitrarily now.

Dots on other coils are now automatically decided according to the sense of the winding. Now we are to determine the position of dots on the terminals of the remaining windings corresponding to the dot placed at one of the terminals of winding A, which is at A 1. Dot on the other winding is placed on such a terminal that a current entering through the dotted terminal magnetizes the core in the same direction as the flux created by current entering the dot on the first coil A.

Thus, if the dot were placed at B 2a current entering this terminal would produce a flux in opposition to the flux produced by current I A. Thus, B 2 is not the dotted terminal corresponding to the dot at terminal A 1. While, if the current enters terminal B 1the magnetization of the core is also clockwise. Thus, terminal B 1 is the dotted terminal on coil B. Similarly, C 1 is the dotted terminal on coil C. Thus, A 1B 1 and C 1 are dotted terminals on the three coils which are mutually coupled.

This also means, that due to rate of change of the common flux emfs are induced in all the coils which have similar polarity at all the dotted terminals. The self-inductance of a circuit is intimately associated with the magnetic field linking the circuit.

The self-inductance emf may be thought of as the emf induced in the circuit by a magnetic field produced by the circuit current. Since a magnetic field exists in the region around the current that develops it, there is also may a possibility that an emf be induced in the other circuits linked by the field. Two circuits linked by the same magnetic field are said to be coupled to each other.

The circuit element used to represent magnetic coupling is shown in Figure 2 and is called mutual inductance. It is represented by symbol M and is measured in henrys. The volt-ampere relationship is one which gives the induced emf in one circuit by a current in another and is given as. A similar equation can, of course, be written giving an emf e 1 induced by a current i 2.

The two dots, called polarity markings, in Figure 2 are used for indicating the direction of the magnetic coupling between the two coils: note from the figure and from equation given above that by matching the dots, the directions of currents and voltage drops are made to correspond with those of Figure 3 for self-inductance. If currents are present in both coupled circuits, emfs of self-inductance and mutual inductance are induced in each circuit.

The self-induced emf, have the directions shown in Figure 4 the mutually induced emfs, follow the pattern of Figure 2.The primary resistance was measured at 0. Is the voltage being drawn away from the primary to the ballast? What is this current limit you are using? Do you realize when you limit current you imply reduction in voltage. I gather you want to reach 10KV how are you measuring your KVs?

What is your limiting device? A circuit would be of some help. Answer 8 years ago. The MOT is current limited in series on the primary side with an inductor. I do realise if I current limit I will imply reduction in voltage and I think that may be the problem.

I am measuring my kVs by the millimetre 1. Even with the inductor it still blows the fuses. So what value fuses are you evaporating the metal from? You are using an inductor of unknown inductance, to me, to limit current. That implies you are using AC power. You mention Tesla coil power supply. And that means you could try resonating with the primary which should increase the voltage substantially at no extra current.

I am limited to guessing on the skimpy information you provide no circuit It is your historical way of asking :- But I can tell you are not resonating with your primary.

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Perhaps you should replace the inductor with a high voltage AC capacitor to limit your current and when you hit the correct reactance it may resonate for you. I can estimate the inductance of the inductor to be H. Sorry that I've been unspecific I might try that capacitor idea. Tags: MOT high voltage current limiting.

Reply Upvote. The MadScientist iceng Answer 8 years ago.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.

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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.

What is an Induction Motor?

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! 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.

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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?

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And lastly, what does in electrical terms un ballasted and ballasted mean? Or, can a 30 amp breaker, 10 gauge wire, and 30 amp receptacle, wired to my existing breaker handle the amps on the MOT along with a 30 amp custom short extension cord work?


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