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Tool Talk Discussion Forum

Re: Faking 3 ph power?

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10-05-2012 21:20:35

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google home made phase converters. I made mine with a 5hp 3 phase and a 220V half horse spinner motor. Basically hook L1, L2, and L3 to the input side of a 3 phase switchbox. Hook 220V single phase to two of the poles in the switchbox to the motor side, using L1 and L2. On the load side of the switchbox, run L1, L2, and L3 to the motor you want to run. The half horse motor gets hinged to the 3 phase motor, belted to it, and is wired to a little switchbox that is wired to the 220V input of the big box. Start the spinner motor, when the 3 phase is up to speed, turn on the big box, and shut off the little on, flip the hinge so the belt loosens. L3 is generated by the 3 phase motor. No capacitors needed....Voila! 3 phase power.

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10-06-2012 06:48:29

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 Re: Faking 3 ph power? in reply to JMS/.MN, 10-05-2012 21:20:35  
You can also use a capacitor to start your inverter motor and eliminate the little pony motor. I've got a small one i built this way and also a larger one that was factory built.

The nice thing about about a rotary converter as opposed to a VFD is that you can also run other 3 phase motors from it. A VFD is set up for only 1 motor.

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Bud in WV

10-06-2012 05:22:17

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 Re: Faking 3 ph power? in reply to JMS/.MN, 10-05-2012 21:20:35  
Thanks for the info guys! The VFD sounds like it'd be great but I can't afford $1k for what I'd need. The lathe motor is 3hp so it'd take a 5hp rated VFD.

I have a friend who's an *old* electrician - 85 & still working...he enjoys it. I hope he can determine which lead is which.

I have several 1/2hp & 1hp motors I can use to kick start this one...or use a pull rope. Basically I can build what I need with parts I have on hand or spend $1k to go the easy route.

Thanks for all the info! I never heard of a VFD - I was mechanical - not a sparky....

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