any transformer experts here ?

Technical discussion on converting internal combustion to electric
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HeadsUp
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any transformer experts here ?

Post by HeadsUp »

anyone got opinions what this might be ?

it has no markings for input or output voltage

looks like 2 mm and 3.5 mm thick copper strip windings , the 3.5 mm thick winding has 3 taps , the other thinner one has 2 taps

probably ex navy

45 kg all up , measures about 28 cm long x 15 cm wide

how can i test it ?

just stick an adjustable power supply on one end and see what jumps out the other ?


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Post by HeadsUp »

only found this from googlisation

web page without much info :(

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lithbattboss
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Post by lithbattboss »

Could be some kind of welding transformer by the looks of it. With such heavy windings it is probably a low voltage , high current output transformer which would be typical of a welding transformer.
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Squiggles
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Post by Squiggles »

My guess is it has a centre tapped high current secondary winding.

If you use a variac as your adjustable supply you should have no trouble working out the turns ratio. If you put 24V in you might get something like 5V - 0V - 5V out.



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acmotor
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Post by acmotor »

Just thinking... at 45kg did you say ? and an auto transformer it would be maybe 20+kVA rated. If it were a typical mains auto transformer voltage range of say 230 to 110V then the 110V would be at 20,000/110 = 180A thus the large copper strap wiring.

Auto transformers are roughly 1/3 the weight of isolating transformers.
I would not expect this item to be anything to do with voltages <100V. Even then, consider the CSA of the copper, allow maybe <5A/mmsq in a transformer, possible kVA rating and go from there.

No harm in putting AC at some low voltage (24V?) into it and having a poke around. Remember the iron losses may require you to supply several Amps just to get things going.

A way I have used to establish the voltage of a winding is to use a variac with current monitoring in line and raise the voltage looking for a knee (current rises sharply). That will be magnetic saturation of the iron core and working voltage will be less than that depending on transformer design. Typically 75% of the knee voltage. You can also look at the output voltage and see it reach a top knee.
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acmotor
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Post by acmotor »

Did I see reference to 400Hz ? That puts the power rating up by a factor of 8 !
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Post by EClubman »

Definitely a Decepticon.
(sorry :-)

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Post by HeadsUp »

acmotor wrote: Did I see reference to 400Hz ? That puts the power rating up by a factor of 8 !
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thankyou peepil


yes

400 Hz

so possibly airforce equipment for its light weight , will let people know if i get a reply on specs from the USA

i have found references to them on US websites which specialise in aeronautical surplus but no other specs yet



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Richo
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Post by Richo »

Might I ask what you want to do with it?

At 45kg I doubt you'll be putting it in an eV for charging...
So the short answer is NO but the long answer is YES.
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Post by Peter C in Canberra »

It does say autotransformer on the label. Is there continuity between all terminals? That would mean one long winding. Maybe it is for transforming mains voltage at modest current (on the two smaller terminals) down to very low voltage at very high current (on the two large terminals)?
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Post by HeadsUp »

Richo wrote: Might I ask what you want to do with it?

At 45kg I doubt you'll be putting it in an eV for charging...
i have a constantly open mind always looking for ways to use what i find around me.

its worth $ 65 in scrap value , so thats what i paid for it , hoping that might obligate the risk of me not finding a use for it in an EV or a mini hydroelectric inverter on the farm i am looking at buying

thanks for help

i will stick 40 - 240 VAC on it when i get a chance and see if a naked genie pops out the other end

optimism never hurts !


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