[TheForge] 3 Phase Converter DIY

Sun Dec 8 08:23:00 2002

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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