[TheForge] 3 Phase Converter DIY

Sun Dec 8 16:29:01 2002

If your idler motor is not at least as large as the load you are trying to
start, you will stall the idler.
On the other hand, if you have a 5 HP idler and you start a 5 HP motor with
it you can now start another motor that is 10 HP. Then if you have enough
amperage available from your 220 circuit, you could start another motor that
is 20 HP. Each running motor adds capacity to the system.
This is from personal experience. I have a 5 HP phase converter. I can not
start a 7.5 HP motor even with no load unless I have other motors running.
On the other hand transformers in the 3 phase circuit do not add anything to
the capacity and may not need as big of idler motor to work.

Darrell

----- Original Message -----
From: "T.L.Tallman" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 08, 2002 5:42 AM
Subject: Re: [TheForge] 3 Phase Converter DIY

> i have friend who has a 30 hp 3 phase motor for sale
> terry
> ----- Original Message -----
> From: "Ed F" <[email protected]>
> To: <[email protected]>
> Sent: Sunday, December 08, 2002 7:20 AM
> Subject: Re: [TheForge] 3 Phase Converter DIY
>
>
> > Hi Steve,
> >
> > Thanks.  I have a few.
> >
> > 1). Everyone says that the generator motor has to be rated for the HP
you
> > will drive plus some, except a friend who is sending me something out of
a
> > text book on it.  He says that only one set of windings are doing much
> work
> > so you can use a motor about 1/3 the rating of your consumption.
> >
> > By that, a 1 HP generator would have the current running through one set
> of
> > windings that your 3 HP driven motor uses.  He argued that the windings
> are
> > rated for heat not current, and the one working leg is wound together
with
> > the 2 low current legs so it's fine.
> >
> > It's not really a big deal for my press motor which takes about 5hp, but
> if
> > I make one for my welder at 1 to 1 I would need a 30 HP motor!  Quite a
> > difference from 10.
> >
> > 2). Did you do anything for fusing?
> >
> > 3). What precautions did you take with your capacitors to keep from
> getting
> > zapped?
> >
> > 4). Did you have to play much with your capacitors to get the motor
> > balanced?  Did you balance the current or voltage?
> >
> > 5). Did you start the generator with a capacitor?  I have heard of some
> > people using a small single phase motor or even a pull start.
> >
> > Thanks again,
> >
> > Ed
> >
> >
> > ----- Original Message -----
> > From: "Steve Smith" <[email protected]>
> > To: <[email protected]>
> > Sent: Friday, December 06, 2002 7:52 PM
> > Subject: Re: [TheForge] 3 Phase Converter DIY
> >
> >
> > > I've built several converters, I'll be happy to help if you have
> > > questions (as will several others, I'm sure).
> > >
> > > Steve Smith
> > >
> > > Ed F wrote:
> > > > I want to look into making a 3 Phase converter to run a 3 phase
> forging
> > > > press motor off of 220 single phase.  I can get away with a 5 hp but
I
> > will
> > > > probably go to a 7.5 hp.  I ordered the plans from ABANA way back
and
> > lost
> > > > them.  I remember them  being about 3 pages and on the minimal side.
> > I'm
> > > > thinking that by now someone probably has better directions on the
web
> > > > somewhere, or maybe someone here is willing to share experience?
> > > >
> > > > Ed
> > > >
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