I'm on the lookout for a meaty transformer as the basis of a single to 3 phase converter for 3 to 4 HP This could be an auto transformer 230 in -415 out or a 230in 115 out isolating transformer with some taps on the 230 volt winding enabling me to connect mains into a lower voltage tap designed for say 210v and put the secondary in series with the primary to get around 400-440 volts out.
Anyone got anything lying around to swap for beer vouchers or eternal gratitude etc??
If you find a source tell us! My homebrew version is running two large 415v to 55-0-55 transformers "in reverse" with series input and parallel outputs (a Pentagrid Jim suggestion). Works OK Transwave will sell you a bare tranny as a start point.
I had a transformer built for my converter by JMS transformers in Peterborough a couple of years ago, they did an 8KVA unit in a floor standing case for £155; they can be contacted by email at snipped-for-privacy@transformers.gb.com (usual disclaimers apply). Martin
A few years ago someone here contacted one of the converter companies ("Boost"?) and persuaded them to sell a couple of transformers for a sensible (but not cheap) price - it might be worth a few calls.
Ive been in touch with both a transformer manufacturer (Douglas) and
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The latter seem completely happy to sell the transformers that they use in their products. As an example, the tranny from this model
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they will sell for £108 plus 10.50 carriage all plus vat total 'bout £139
This is cheaper than Douglas.
I guess this is not too bad a price although more beer vouchers than I currently have to spare for the project. Maybe I could sell the excesses of Christmas socks, handkerchiefs, slippers etc on Fleabay to raise funds?
Ive been in touch with both a transformer manufacturer (Douglas) and
formatting link
The latter seem completely happy to sell the transformers that they use in their products. As an example, the tranny from this model
formatting link
they will sell for £108 plus 10.50 carriage all plus vat total 'bout £139
This is cheaper than Douglas.
I guess this is not too bad a price although more beer vouchers than I currently have to spare for the project. Maybe I could sell the excesses of Christmas socks, handkerchiefs, slippers etc on Fleabay to raise funds?
Regards
Bob
Bob,
I bought a transformer direct from Transwave a few years back when I made a 10KW converter (I think it's the one Tim Leech now has) - they were excellent to deal with, brought it to the ME show at Wembley (that dates it!) and the chap even lugged it into my car boot as I had a dicky back at the time. I'd done a lot of searching arround and they were the best deal I could find.
Hang on until we move the factory. We used to have some 230/415 trannies for some spot welders that we sold, and I think the transformers may well be lurking under benches in the factory, covered in 20+ years of dead spiders and dust.
I'll have a tentative poke around after Xmas when we move out the coilwinding gear and have a bit of free space.
Peter
-- Peter A Forbes Prepair Ltd, Luton, UK snipped-for-privacy@easynet.co.uk
No promises! but they should still be there, somewhere....
Because the spot welders were 415V single-phase input, we had to have the trannies made to run them off 240V 13A sockets, and when the welders went I am sure we didn't let the transformers go with them.
We've been in the factory since it was new, 23 years this coming Xmas....
Seems like yesterday....
Peter
-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:
Andrew, would that have been the converter that I gave you a whole load of capacitors in exchange for a 3 phase motor for my compressor a good few years ago? Your post just stirred my memory Bob
I guess if we actually had a horde, we'd be looking for two new factories, not one!
New place is just round the corner from where we live, so a minute or so to walk to work each morning rather than hour and a half or more and the same at night.
Also nearly twice as big, so room for yet more junk.... :-))
Peter
-- Peter & Rita Forbes Email: snipped-for-privacy@easynet.co.uk Web:
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