pugwash Posted January 28, 2008 Share Posted January 28, 2008 I have access to a free 3-phase fairly meaty hydrovane air compressor. Is there anyway of powering it from a single phase supply (presume the supply has enough amps) without spending an arm and a leg on an horrifically expensive converter? Quote Link to comment Share on other sites More sharing options...
Astro_Al Posted January 28, 2008 Share Posted January 28, 2008 TOOLS AND FAB!!! GRRRRRR How many amps is 'enough'?!?! A lot, methinks. Any idea of the spec? Al. Quote Link to comment Share on other sites More sharing options...
pugwash Posted January 28, 2008 Author Share Posted January 28, 2008 TOOLS AND FAB!!! GRRRRRR How many amps is 'enough'?!?! A lot, methinks. Any idea of the spec? Al. ALRIGHT big boy don't get your knickers in a twist. Can one of the mods move this please before Al has a fit ta ignore the meaty comment- in some odd freudian way i type that by accident it's only a piddling 2.2kw that supplies around 8cfm- just enough to run air tools i hope Quote Link to comment Share on other sites More sharing options...
jimfoo Posted January 28, 2008 Share Posted January 28, 2008 Your only choices are buy an equivalent single phase motor, buy a rotary converter or an electronic converter. There is no other way to run a 3 phase on single phase power. Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 28, 2008 Share Posted January 28, 2008 Probably easiest to source a single-phase motor from eBlag and bolt that on. Power conversion isn't cheap however you slice it. Quote Link to comment Share on other sites More sharing options...
Happyoldgit Posted January 28, 2008 Share Posted January 28, 2008 Moved Quote Link to comment Share on other sites More sharing options...
Astro_Al Posted January 28, 2008 Share Posted January 28, 2008 ALRIGHT big boy don't get your knickers in a twist. Can one of the mods move this please before Al has a fit tait's only a piddling 2.2kw that supplies around 8cfm Pants officially un-wadded. Ok, cool, just a tiddler really. Defo swap the motor. Al. Undercover, unpaid, unrequired Mod. Quote Link to comment Share on other sites More sharing options...
Superpants Posted January 28, 2008 Share Posted January 28, 2008 It is possible to run three phase motors on single phase by using capacitors to effectively create the three phases, however this will require quite an investment in parts, and isn't particularly efficient- My dad has used this to run his lathe, but he had the parts already, and the motor is relatively small (sub horsepower IIRC). For the price of the parts I'd be inclined to either change the motor or buy an invertor or convertor- they do turn up from time to time secondhand. Quote Link to comment Share on other sites More sharing options...
miketomcat Posted January 28, 2008 Share Posted January 28, 2008 my old man has a transwave converter which he runs a 3 phase mill and lathe on might be worth a google mike Quote Link to comment Share on other sites More sharing options...
Mark Posted January 28, 2008 Share Posted January 28, 2008 Have a look on http://www.homeworkshop.org.uk/ as there is a guy who regularly advertises inverters on there for sensible money. I run my milling machine form an inverter purchased though the guy on there. You would likely spend less by getting a single phase motor, or even a complete compressor though. 2.2kw is nigh on 3HP which you should be able to find an inverter for for sensible money... enjoy Mark Quote Link to comment Share on other sites More sharing options...
Night Train Posted January 28, 2008 Share Posted January 28, 2008 Unless you are thinking of having other three phase kit then you would be better off just getting a replacement single phase motor. Machine Mart will have something off the shelf but you can probably find cheaper. Quote Link to comment Share on other sites More sharing options...
carl hurst Posted January 28, 2008 Share Posted January 28, 2008 I had to invest in one for my old unit and i got one from transwave i had to tell them all the info on the machines and welders and had one built(rotary type) it wasnt cheep (around 2k) it had a switch on so as the weler could be used which was a pig as then you couldnt use anything else,and it needed a dedicated 80amp supply to run and a forklift to move it. Quote Link to comment Share on other sites More sharing options...
integerspin Posted January 30, 2008 Share Posted January 30, 2008 I don't think inverters are suitable for compressors, I know static converters don't like them, mine used to go into start up mode every compression;-) maybe a hydrovane would be OK though. If it's just one thing you want to run a single phase motor is the easiest way. Rotary converters don't cost a lot to make, I spent about 200 squid on mine. That was a custom wound transformer, new capacitors and all the other bit's were new[except the motor]. Once the converter is turned on any of my three phase kit, polisher, grinder, mill, lathe, saws, plasma and compressor can be used. You can just use a three phase motor as a converter. Wire your single phase to a three phase motor, spin the motor with a bit of string and switch the mains on when the motor is spinning, if it comes to a dead stop try again and spin the motor the other way. it should accelerate up to speed. You can take three phase off the motor terminals, the voltage on the 'wild' phase will be low but motors happily run off it.. If you do a search you will find people in the states running CNC workshops off converters like this... If you want to test your compressor and have a 5hp or so 3 phase motor try it.. First time I did this it freaked me out all those years of turning down three phase kit and it was so easy to get it running, I tried this when I needed to run a grinder on single phase. Quote Link to comment Share on other sites More sharing options...
redben101 Posted January 30, 2008 Share Posted January 30, 2008 CEF in Taunton can probably help you and are rammed with product catalogues which they would prob dig out for you. If you do find anything u need from them i have an account so can prob get you a favourable price Quote Link to comment Share on other sites More sharing options...
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