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Thread: Single to Three phase converter
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10th Sep 2012, 11:13 PM #1Most Valued Member
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Single to Three phase converter
I spotted this on Ebay Single to Three phase converter, Lathe, Mill, Bandsaw & Press | eBay
It is being sold from somewhere near me but I don't know who it is and have no affiliation what so ever with the seller.
I assume that inside that blue box is a single phase motor that is coupled to a 3 phase motor that then acts as a generator to provide 3 phase power.
I am thinking that no matter how many 3 phase motors are running the maximum power obtained for use would only be about 3 hp, or am I missing something ?
Also can somebody legally build and sell these ?
and......I thought that this type of converter was a bit of a backyard job
shed
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10th Sep 2012, 11:21 PM #2
Yep check this site out.
Phase Change Converters - converting single phase power into 3 phaseCheers
DJ
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10th Sep 2012, 11:37 PM #3Diamond Member
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This sounds like it is a rotary phase converter, and as such, they can be very effective. It will not however run one 10 HP motor which is fully loaded and actually developing 10HP, from a 10 Amp power point, let alone run 3 of them. 30 HP is around 22.5 Kw, which at 240 volt input is over 93 Amps. The current surge on startup would multiply this several times over, so there is no way a 10 Amp outlet will go anywhere near powering this RPC for 30 HP. Having said that if the power input is up to scratch, then it may well run 3 X10 HP motors, but even if this is outside its capability, a 10 Amp supply would probably run a 2 H.P. motor, especially if it was not a heavy load on start-up, A fan rather than an air compressor for example. R.P.C.s have the advantage over inverter supplies (VFDs or VSDs) that the one power unit can run several motors at the same time, which the others generally can't. There is lots of info about them on the Practical Machinist Website, including a build from one of the forum members here. I hope that this helps,
Rob.
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10th Sep 2012, 11:39 PM #4Most Valued Member
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10th Sep 2012, 11:53 PM #5Most Valued Member
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