[TheForge] Variable Speed Motors and Beaumont Metalworks

Wed Sep 11 18:00:01 2002

I don't think so Tim.
I don't know of a VFD designed for 2 phase to three phase conversion. 
They will work. and you can run a 2 hp motor with a 2hp vfd but not as  
long.
Think about it. You have two legs of current comming in and three legs 
of current going out. This is on a vfd that was designed for 3 legs in 
and 3 legs out. Don't you think the 2 legs or wires are going to have 
to be beefier?
P=IE
2 legs in I = I1+I2
3 legs in I = I1+I2+I3
You also lose some power because 3 phase is more efficient than 2 phase.
3 phase is closer to DC constant current

----- Original Message -----
From: Darrell <[email protected]>
Date: Wednesday, September 11, 2002 1:12 pm
Subject: Re: RE: [TheForge] Variable Speed Motors and Beaumont 
Metalworks

> http://www.dealerselectric.com sells a 2HP package that is a 2HP 3 
> phase motor
> and a 2HP VFD that takes 220 volt single phase in 220 volt 3 phase 
> out.Where you need to double the HP rating of the VFD is when 
> using a 3 phase in 3
> phase out unit. If the VFD is designed for single phase in, then 
> it will work
> with a motor that it is rated for.
> 
> Darrell
> 
> http://www.machinemaster.com
> 
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> ----- Original Message -----
> From: "MARC DAVIS" <[email protected]>
> To: <[email protected]>
> Sent: Wednesday, September 11, 2002 5:36 AM
> Subject: Re: RE: [TheForge] Variable Speed Motors and Beaumont 
> Metalworks
> 
> >
> >
> >
> > Yes it will convert 220v single phase to 3 phase but remember 
> you need
> > a VFD
> > rated double what you would normally use with 3 phase in.
> > Marc
> > Marc of the Hammer
> > >
> > >
> > > I have a 2 hp 3 phase unit with a VFD (variable frequency)
> > > controller. It
> > > inverts single phase to 3 phase and acts as a variable speed drive
> > > as well.
> > > I would recommend this/or a DC unit as opposed to the pulley
> > > drives ANY
> > > DAY!! The VFD has some many parameters that you can set it is
> > > silly!! Go
> > > here:
> > >
> > > http://www.dealerselectric.com/
> > >
> > > These are the people that I have gotten my VFD's/Motors from on
> > > occasion. 3
> > > phase motors are cheaper/more efficient in the long run. You can
> > > also find 3
> > > phase motors on e-bay all day long.
> > >
> > > Good Luck
> > > Mark
> > >
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