[TheForge] 3 Phase Converter DIY

Sun Dec 8 16:35:00 2002

The circuit breaker on the 220 volt line is what I have for fusing on the
power side. The mill and lathe have there own fuses.
On the capacitors I have a 10,000 ohm 10 watt resistor that bleeds the
capacitors off when not running.

Darrell

----- Original Message -----
From: "Ed F" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 08, 2002 5:20 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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