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6 comments
Participant

Join Date: May 2008
Posts: 1

Electrical

05/13/2008 3:43 PM

Can i run a 3 phase electric motor on a 220 single phase?

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Guru

Join Date: Sep 2006
Location: California, USA
Posts: 640
Good Answers: 43
#1

Re: Electrical

05/13/2008 7:55 PM

Sure. It will not start and it will eventually burn up if you load it more than about 1/3 of it's rating, but if you give it a kick start it will keep turning for a while with that reduced load.

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Associate

Join Date: Apr 2008
Posts: 33
#2

Re: Electrical

05/13/2008 8:35 PM

Is it 480V or 208V and how many horsepower?--either way I wouldn't unless you get a VFD or some kind of phase converter.

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Join Date: Jan 2008
Posts: 5
#3

Re: Electrical

05/13/2008 9:44 PM

3 phase electric motor will run 220 single phase by using capacitor for starting

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Posts: 33
#5
In reply to #3

Re: Electrical

05/18/2008 2:33 AM

I'm not so sure about that--I will be finding out tomorrow as I have 208V A/C unit and will be looking into wiring it for 240V.

208V has two legs that are 120v to ground--exactly the same as 240V, except that 240V legs are polar opposites(180 degrees apart) and 208V are 120 degrees out of phase.--We'll see.

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#4

Re: Electrical

05/14/2008 7:52 AM

Quite happily, if a correctly-sized 1Φ to 3Φ inverter is used.

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#6

Re: Electrical

05/19/2008 11:19 PM

--If it is 208v single phase, yes(which is two of three 480v legs, but still single phase). I cleaned and examined my 208V A/C unit and found it to be labeled for 240V also, without any wiring changes, so I tried it with a widow maker and it ran slightly imbalanced, but had low amps and performed well.--

A three phase motor can be wired Y or Delta and either way it has even coils between the three T leads.

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