[TheForge] Variable Speed Motors and Beaumont Metalworks

Wed Sep 11 22:20:01 2002

The TECO/Westinghouse VFD units from 1/2 HP to 3 HP are rated single phase/three
phase input with out put at the units rating. Over 3 HP they are three phase
only rated, these are the ones that will work on single phase derated by about
50%. The way they work is the 60 cycle power in is rectified to DC voltage and
then the electronics in the box convert the DC voltage into three phase at what
ever frequency that you have the box set at which is what gives you the speed
control.
Any way, don't argue this with me, I am just quoting Westinghouse the maker.

Darrell

http://www.machinemaster.com

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----- Original Message -----
From: "MARC DAVIS" <[email protected]>
To: <[email protected]>
Sent: Wednesday, September 11, 2002 2:51 PM
Subject: Re: RE: [TheForge] Variable Speed Motors and Beaumont Metalworks

>
> 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
> >
> > Exciting offer! You won't believe it! FREE INTERNET SUPER STORES!
> > Earn Big
> > Income! How? By giving away SUPER STORES for FREE! Try it FREE!
> > www.freestoreclub.com/go/MoneyMaster
> >
> >
> > ----- 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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