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What exactly does a phase converter do?

Toolhorder

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Nov 9, 2009
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Location
Montana
Just curious what a phase convertor does, how it's wired so you can use 3 phase machines with it, etc.. Thanks
 
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Norcal

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Mar 16, 2008
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13,792
Just curious what a phase converter does, how it's wired so you can use 3 phase machines with it, etc.. Thanks

Depends on what type, a static uses caps to start a 3Ø motor & then it single phases the motor, losing 1/3 of the rated HP.

A single phase input VFD up to 3 HP can take 240V 1Ø & convert it to 208 or 240V 3Ø & 1 HP units can be bought w/ a 120V input. Above 3 HP, in most cases a 3Ø VFD would have to be derated 50%.

The 3rd option is a RPC, rotary phase converter which can be bought from numerous vendors or self built, this will enable more 3Ø equipment to be ran & be most likely cheaper for more 3Ø tools.


A couple of places to search for more info is the Practical Machinist or Old Woodworking websites

PM has a forum for this: http://www.practicalmachinist.com/vb/transformers-phase-converters-vfd/

OWWM has a electrical forum that is visible to registered users, there are limits as to what is allowed to be discussed, but those subjects out of bounds can be brought over to the electrical forum here.

www.owwm.org

This is just a small amount of the info avail. on the web.
 
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pugs

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Apr 16, 2011
Messages
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4th option, and best if running cnc, is a digital converter. I have two 20hp Phase perfects in my shop. A bit pricey for home shop type use but by far the best if no 3ph available.
 
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