[TheForge] Fwd: Shop tools & layount (3-phase converter)

Tue Jan 20 22:50:01 2004

When you get the rebuilding done Ralph, you should send the hammer up here till
they get three phase closer to you : ) I have three phase in the new shop and
can take care of the hammert for you till you get the three phase.

John

Ralph Sproul wrote:

>         Well, Maybe I ought to fess up as to what I'm really thinking!
>
>         The Nazel 3B I'm rebuilding has a 575 volt, 3 phase motor that runs
> at 875 RPM.  So, I was thinking of making a 10 Hp phase converter that would
> make 240 - then going with transformers to boost the voltage to the motors
> correct plate requirements.  I have a 10 Hp idler motor available to me, and
> the transformers off a really large industrial control panel with high
> voltage ratings.........so I was wondering if that might be an option as
> compared to taking a tractor PTO to run the pinion gear to the hammer, or if
> it came right down to it......... maybe a chevy Cavelier front wheel drive
> friction unit developed a few miles north of here.        (Oh, Hi Mike)
> :-)
>
> Ralph
>
>         PS, 3 phase is not an option - the nearest line is miles from here.
>
> ----- Original Message -----
> From: <[email protected]>
> To: <[email protected]>
> Sent: Monday, January 19, 2004 10:47 AM
> Subject: Re: [TheForge] Fwd: Shop tools & layount (3-phase converter)
>
> > Yes, to get optimum performance you should add run capacitors,
> > especially if you are only running a single motor off of the
> > converter.   I expect that your unit has both run and start.    The run
> > capacitors are there to balance the current, rather than voltage.
> > For the average  home shop where you just want to be able to run that
> > single bargain industrial machine I would just wire up a second motor of
> > same or larger size as a rotary converter, use a rope to start  it.   If
> > your machine motor gets hot with your usage, then I would go to the
> > trouble of balancing the current with capacitors, otherwise just keep it
> > simple and be happy.    The power company doesn't measure power factor
> > for residentials.    For your situation Ralph,  it would be worth
> > monitoring the current with an amp meter and adding capacitors as needed.
> >
> > Charles
> >
> >
> > Ralph Sproul wrote:
> >
> > >Charles,  Thanks for writing this reply to the converter topic.
> > >
> > >I have one question.  On the Static converters your mentioning the size
> of
> > >the capacitors for starting and running loads.  Does one have to "tune"
> the
> > >third leg of a rotary phase converter with capacitors?
> > >
> > >I'm asking as the store bought 7 1/2 HP  rotary phase converter that was
> > >included in my Iron worker package deal has a bank of capacitors in
> > >it.........is this just for starting? or is this to bring the
> manufactured
> > >leg up to acceptable voltages?.......or both?
> > >
> > >
> > >
> >
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