» Fixtures "Powerful do-it-yourself electromagnet from microwave transformers

Do-it-yourself powerful electromagnet from microwave transformers

Good day, dear the inhabitants of our site!
This article will be of interest to everyone who works with heavy metal products, such as sheet metal, steel channels and beams. The author of the channel "Make it Extreme" made a powerful electromagnet for lifting and moving ferrous metal products.

And for this, from the materials he needed:
1. Three transformers from the microwave
2. Steel sheet
3. Steel strip
4. Epoxy
5. A few wires and terminals
6. Eye bolt with nut M12
7. Power supply 24 V 100 watts, preferably redundant battery.

Instruments.
1. Welding machine
2. Bending machine
3. Drill or drilling machine
4. Milling machine
5. Power saw.

So, as usual, in order to do something, you need to break something. The author approached several old microwave ovens. Not in a very barbaric way, but takes them apart for parts.




It extracts the most valuable and necessary for this homemade product - a transformer.


With the help of a grinder and a screwdriver, it separates the sole, this must be done carefully so as not to damage the winding.





It should be like this.


Knocks out a winding with a hammer.


He takes out the most necessary - the primary.


And removes the secondary.


Now the primary winding needs to be installed on the remaining W-shaped core.



To do this, the author uses a vise, inserting a square profile pipe between the winding and the vise, presses in the primary.


Now you need a base, in the end it will become a cover.

Approximately selects the location of the transformers.




And he drills the holes for the wire and the eye bolt at the base. It starts with a small diameter drill, and ends with the 12th.




That’s the basis.


Inserts an eye bolt and tightens the nut.


On a bending machine makes a "skirt" or rim from a steel strip.




It turns out this kind of blank.


Boil the rim joint.


Assembles a casing together.




Boils a seam between the base and the rim.




Here's a seam from the author.

Cleans the seam and surface with a grinder.


Inserts an eye bolt and tightens the nut. Yes, the puck is not needed here, the effort will be directed towards the base.




Welds the nut to the base.


The bolt unscrews the eye, it will interfere with further assembly.

Arranges transformers in their places.


And it very well welds them to the base, so that they would not be torn off.



Proceeds to the electrical part.Stripping wires.

He puts on crimp terminals, clamps the stripped ends of the wire in them.



It turns out four connecting jumpers, crimped on both sides.

In addition puts on a thermoshrinkable tube.



Connects transformers.


Through the previously made hole, the lead-in wire passes.


An outlet is installed at the end of the wire, not a plug. This is done so that no one would plug in 220, because the device’s power supply is only 24 Volts DC.

Having sealed all the holes, mixes the components of the epoxy resin and, having thoroughly mixed, fills it into the body.



It turns out here is such an almost finished product, it remains a little refine.


Cuts the protruding edges of the cores.




Levels the working surface on the milling machine.



Appearance after stripping and milling. The work surface has become smooth.



The final painting, the wire the author protected with masking tape.


Suspends the finished electromagnet by the hook of the elevator and connects the power connector.




On the electromagnet control panel there are two toggle switches - one from the mains power supply, the second from the backup battery. This is done in case of a power outage, the author in this case turns on the siren.

Checks on a small steel plate. The magnet works!


Starts more serious tests. For a start - a larger sheet.


Withstands even two men.

Even with partial contact with the surface of a steel beam, it confidently holds it.

Well, or just like that, you can indulge.

So, the power consumption of the electromagnet is 86.4 watts. Supply voltage 24 V DC at 3.6 A.

Thanks to the author for the great idea and its implementation!
Observe safety precautions!

Good ideas to all!
9.9
9
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35 comments
Windings must be connected in parallel.
Not sure if the current consumption may be too large, I agree with the rest.
D.C. What stars and triangles are there?
Windings must be connected in parallel.
I was embarrassed by something else! Who taught the welder to cook to the base with installed windings ???
About the inter-turn circuit is unknown? Taking into account the heating temperature of transformer iron and the expansion of metal spatter, what is the probability of damage to the insulation of the windings?
Yes, almost one hundred percent!
Such a malfunction can be immediately imperceptible. But over time, a local overheating of the damaged winding will occur and it will fail.
About the technique of repairing the product, you can not even stutter.
Having experience in the production of radio components, I dare to assume that the author was unlikely to select a compound according to the properties of thermal expansion and hardness after complete polymerization.
When heating the coils, a hard compound can also damage the insulation or even break the winding wire.
Tested on thousands of lower case television transformers. With an unsuitable compound and insufficient insulation of the wires from the compound, the windings were torn at a time.
Author
Here you are right, I agree! But probably the boys did not have a soldering iron, only a milling cutter and a lathe =)))
And here's another thing - is it possible to fill knife clamps with a compound? Asks for soldering.
as well as seat thermobots lighter. Yes, I’ll add to the above - the eye bolt would also be welded from the inside.But done beautifully, and carefully, we must pay tribute.
Author
But such things are sooooo good.
Author
Wait for the article on the electromagnetic table. I hope to write today.
And also on the assembly technology:
1. It is easy to damage the windings during welding.
2. Filling with resin must be done after checking the product.
But this does not exclude a malfunction after pouring.
I had to "hammer the resin" to replace one diode on the board.
And peck the foam to replace one capacitor.
That's just nothing is said about it, but the following is said:
On the electromagnet control panel there are two toggle switches - one from the mains power supply, the second from the backup battery.
And more - not a word.
Author
The author has a button on the remote control. yeah.
To release the load as you will?

It is necessary to break the power supply circuit of the electromagnet after the rectifier and the battery connected in parallel to it. And by the way, I’m not only eating in my head, I wear a hat on it in winter! smile
Quote: Korolev
The battery must be connected constantly, and not through two toggle switches
To release the load as you will?
Leobrynn,
you can reserve by battery

Not possible, but necessary, and the battery must be connected constantly, and not through
two toggle switches - one from the network power supply, the second from the backup battery
Even a very short power outage is fraught with trouble!
parallel connection. it’s logical.

I do not see the logic, my trance has a resistance of 1.5 Ohms!
I went to the author’s page

Come again, take an interest in phasing of windings! smile
Gentlemen, everything is easier! He prepared FOUR connecting wires.

For parallel connection you need six wires, crimped from one end!
Author
It is better to immediately rail onto three input buses.
That's the right decision. Moreover, it should be a plug, and there should also be a device that prevents accidental opening of the connector.
Quote: LeoBrynn
Otherwise, 220 were chopped off - and a suspended piece along the head or leg ..
A head has been given to a person not only in order to eat it, but also in order to think and not substitute wherever it falls. But the equipment over which the cargo is moving without damage can really be damaged and even very large.
Author
What a horror. Of course, on these windings and 120 can be shy, but this is already superfluous. The main thing here is that you can reserve the battery. Otherwise, 220 were chopped off - and a suspended piece along the head or leg ..
On the page where, as the author pointed out, the details of the electromagnet are painted, he writes
The electromagnet should usually be electrically equipped with a 48v 12A transformer, but because of its impossibility, because of its high cost, we used the transformer that we already had.

By the way, there he also does not answer questions about the connection.
In general, I liked the homemade. For small workshops, a great thing. And money is not expensive.
Afftor does not know the difference between serial and parallel connections.
That does not answer.
He is a welder, grinder, sawfly, but never an electrician.
They blinded him, and he was glad.
But the total resistance should be 5 - 7 Ohms when powered from 24 V.
Well, to cut magnetic cores, I think, perverted.
But the main thing is to paint beautifully and make a "logo"!
Author
I would have made a connector right in the case.
A power supply would be good to make bolts. The design is not detachable. If the wire breaks, then adios amigo.
Author
Many answered there, the connection is parallel. it’s logical.
winding resistance, based on the parameters specified by the author 24 Volts / 3.6 Amperes = 6.7 Ohms
I went to the author’s page. For some reason, it stubbornly ignores connection questions. Praise will answer "Thank you", but how it connects is silent-))) A strange master.
Author
pogranec,
Gentlemen, everything is easier! He prepared FOUR connecting wires.
With serial - you need two connections.
Although, FIG knows him, he could be pink and put wherever he was.
1. This is no longer transformers.
2. The resistance of the winding is approximately 2-3 ohms, so that they are connected in series.
Well, look at 3:11, he already has wires on the terminals of the second trance, and by the third he holds out the pink wire.
It seems so. But you still have to watch of course.
As you can see from the video slice

I did not see, if possible, check by time.
the last two options disappear automatically
Naturally, I threw them for fun! smile
Since DC power supply, the last two options disappear automatically.
As you can see from the video slice, the connection is parallel.
Connects transformers

How? Consistently, in parallel, a "star", a "triangle"?

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