three phase motor

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charlieroper

Junior Member
Apr 29, 2015
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I have a ¼ hp coolant pump I want to get operative. The problem is, the motor is 440 v three phase and I've only got 220 three phase coming out of my rotary phase converter; three legs of 110v. The pump motor has only three wires coming out of the stator windings. I took it to a motor rewind place and the guy there told me it can't be wired for low voltage, and these little motors are not worth rewinding.

Small inexpensive transformers are available which double the output voltage, or halve it according to which direction current enters and exits. They're cheap, about $25 I believe.

I’m wondering, my little 1/4hp 440 v pump won’t pull but about one amp at full load,(by my reckoning). Would it be possible for me to step up each 110 v leg individually from my phase converter to produce 220 v per leg with each leg going through its own little transformer? I can see it coming out pretty well through the real legs, but would the manufactured leg cause me too big of problems? Am I overlooking something fundamental?
 

franksta

Golden Member
Jun 6, 2001
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Have you considered a variable frequency drive (VFD)? I've never personally used one but it may be worth considering. Or how about replacing the motor with a 220V one? You can get a 1/4HP for under $100. The plus side would be not needing to worry about cobbling anything together.
 
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Mandres

Senior member
Jun 8, 2011
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I'm no electrician, but it seems like rather than buying 3 transformers it would be much more cost effective to replace the motor assuming you can find one that fits.

I'd bet you can find a good 1/4hp 220v 3-phase for dirt cheap. Not many garage/workshop guys have access to 3-phase power at all so there isn't much demand for orphaned motors.
 
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