Gallery, Projects and General > How to's

Electrical Demagnetizer

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John Stevenson:
OK, it's just that the torroid already has a big hole in the middle so I thought............ and thought...... OK forget it  :wave:

John s.

Bluechip:

Hi Troops

Mine was made from a defunct pistol drill. The armatures usually go Pfttt. leaving the stator OK.

They often have two screws holding 'em together, just cut one out to make the air gap as per attached C-O C.

(Yes, I know it's not very convincing Mr. Stevenson, to professional Electric Motor Consultants, look upon it as a 'Generic Artists Impression' ..   :scratch:)

Put a bit of U-shaped plastic to make a trough, draw the driver/whatever through a few times.



Used to work, I used it with a Variac, but just stick a 60/100W filament lamp in series with the contraption to limit the current.

Bernd.. good scheme using lamps to limit current, specially made ones were used on the 80-0-80 VDC telegraph signalling supplies, called Baretters.

Darren.. didn't think Microwave Trannies went that high, about 2kV?, unless they wind up off load? No matter, you're dead anyway .. rare or bien cuit, it's curtains.

Dave BC

John Stevenson:

--- Quote from: Bluechip on March 21, 2010, 07:38:53 PM ---

(Yes, I know it's not very convincing Mr. Stevenson, to professional Electric Motor Consultants, look upon it as a 'Generic Artists Impression' ..   :scratch:)


Dave BC

--- End quote ---

I much prefer 'Bodger extraordiniar ' instead of Electric Motor Consultant :wave:

Darren, I thought the microwave idea was to gut the tranny and just use the mains input coil and dump the nasty singed bollocks bits ?

John S.

Darren:
Dave, you are right ... I missed the point.... decimal that is  :doh:

John, I suppose if the laminations are removed then there can be no secondary voltage? So Bernd, sorry, you are prob quite ok with what you have done. If I remember rightly (it's been quite a while since I looked at a micro tranny)  are the two coils are side by side and not one on top of the other as in normal windings. Therefore you could separate the HV coil.

Is that what you did Bernd?

Edit, went back and had another look, yes I can see you have only used the primary coil. 110v or 220V ? Forget what I said earlier about the HV coil. Except that anyone playing around with one of these should realise that before they pull it apart the secondary coil can kill you in an instant if you power it up and get a Zap  :zap: :thumbup:

Last time I was playing with these I was powering some old radio valves, now I have a nice 4.3KV transformer with a 3.2Kv tap that weighs 57Kg (decimal correct this time  :) )

Bernd:
Nice thought Darren. Will have to run it through my auto-transformer (variable voltage transformer) to see. As long as it's AC voltage.

Added after reading your message: If you take a look at the original picture you'll see that the transformer on the left is what comes out of the micro-wave oven. The top coil is the primary or mains. It has the larger dia. wire. The secondary has the smaller wirer. As you'll notice in the second picture that all I have is the secondary coil. The one with the finer gage wire. I tried the primary/mains with the lamp in series and the bulb lite up brightly and almost no magnetism in the coil.

Yes, you do need to seperate them. The reason I seperated them was I had to prove to a neighbor who does scrapping he can get about 4 pounds of clean copper out of them. You need to grind out the weld that holds them together.

Bernd

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