Popular Post kempy Posted March 18, 2017 Popular Post Share Posted March 18, 2017 I ended up with this air pump from the shed tour. It's a Siemens 3 phase industrial pump and it caught my eye for the purpose of an extraction fan for my bead blaster. Initially I had thoughts of swapping the motor for a single phase 230v or even a DC motor with a controller so I can adjust the speed, I need the flow rate high enough to keep the cabinet free of dust but not too high so it starts sucking out all the media. Was just about to dismantle it for a clean up when wiped the dust off the top cap which showed the connection options and this is when it got a little more interesting, this motor can be wired in 3 Phase Star or 3 Phase Delta. (Obligatory warning, Dont ever try this unless you are qualified to do this as there's a chance of electrocution, explosion, fire, pestilence, flood and other nastiness) As you can see, in delta the windings are configured in a 240v config, but however if you did hook up a 230v source to say L1 and L2 the motor wont start, it'll just sit there and him and get hot! as there's no air moving to cool it down, you can get the motor running by spinning the shaft and eventually it will start but at a lesser power output and of course wont restart. Remembering a bit of my NZCE done years ago I know that adding a capacitor can have the effect of a phase shift or delay which is similar to adding another phase, there's a few calculations you need to do which I wont go into here in the interest of safety as things can go horribly wrong if you mess it up End result is a very use able 3 phase air pump on single phase, I have a Variac that can make this variable speed, win! 13 Quote Link to comment Share on other sites More sharing options...
hmmmnz Posted March 19, 2017 Share Posted March 19, 2017 and as a bonus when you burn out a phase you have 2 more spare 6 Quote Link to comment Share on other sites More sharing options...
xsspeed Posted March 19, 2017 Share Posted March 19, 2017 iirc theres a way to wire a capacitor or two to lag to get more power/smoother running from motor. i started looking at it for potential hoist Bat signal to @UTERUS Quote Link to comment Share on other sites More sharing options...
Mr Burns Posted March 19, 2017 Share Posted March 19, 2017 And if anyone needs an identical motor/pump to try this on, there may still be one or 3 left. 4 Quote Link to comment Share on other sites More sharing options...
UTERUS Posted March 20, 2017 Share Posted March 20, 2017 3 hours ago, xsspeed said: iirc theres a way to wire a capacitor or two to lag to get more power/smoother running from motor. i started looking at it for potential hoist Bat signal to @UTERUS That's exactly what he did bruh 2 Quote Link to comment Share on other sites More sharing options...
xsspeed Posted March 20, 2017 Share Posted March 20, 2017 Oh lols skim read fail Quote Link to comment Share on other sites More sharing options...
anglia4 Posted March 20, 2017 Share Posted March 20, 2017 One of my mates built a single to three phase converter to run his lathe and mill in his car shed. It runs on mostly black magic with a bit of your run of the mill wizardry thrown in for good measure. I'll try and remember how it works... its mind blowing. 2 Quote Link to comment Share on other sites More sharing options...
ProZac Posted March 25, 2017 Share Posted March 25, 2017 Most 3 phase VSD/VFD's out there will run with only a single phase input (however, you need to de-rate them to about half their stated power) and output a happy three phase for your motorvation needs. 1 Quote Link to comment Share on other sites More sharing options...
taiparacer Posted March 26, 2017 Share Posted March 26, 2017 makes that 3 phase lathe look interesting Quote Link to comment Share on other sites More sharing options...
SOHC Posted March 26, 2017 Share Posted March 26, 2017 I have a 15HP 3 phase motor running on single phase with capacitor start to get it going and it generates the missing phase to run another smaller 3 phase motor witch needs to start under load and then work hard. Quote Link to comment Share on other sites More sharing options...
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