[TheForge] that tired old phase converter question again

Wed Jun 26 02:27:00 2002

Do you have a rule of thumb for how much capacitance to start with for a given
idler motor HP?

Darrell

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----- Original Message -----
From: "Steve Smith" <[email protected]>
To: <[email protected]>
Sent: Tuesday, June 25, 2002 9:29 PM
Subject: Re: [TheForge] that tired old phase converter question again

> Exactly. The idler motor goes in parallel with your load motor (with
> appropriate switching). You have a very simple means to put together a
> rotary converter (or two). Just adding an idler should improve your
> chain fall quite a bit (but check it...). Adding capacitors (rule of
> thumb given in article previously mentioned) will improve things even
> more. Not so much a matter of efficiency as balancing the current in the
> motor windings. You basically want to add capacitors until the voltages
> from each side of the single phase to the third leg are about 10% higher
> than the single phase itself. This gets you pretty close to balanced
> under load.
>
> It is looking like our move will be next summer. I'll keep you (and
> others) posted.
>
> Steve
>
> Ralph Sproul wrote:
> >         Steve, So your saying you just put this idler motor between the
> > static unit and the load you are trying to supply??   Just curious as I have
> > two of those static units and don't really hvae a need for them.   Wondering
> > if this would improve the efficiency of them as I used a static on a chain
> > falls once, and it would heat the motor to the point I stopped using it for
> > fear of destroying a nice electric chain falls.
> >         Nice to meet you in Wisconsin, let me know when your heading east
> > some time, or if you move.
> >
> > Ralph Sproul - Bear Hill Blacksmith
> > Webster, NH
> >
> >
> >
> > ----- Original Message -----
> > From: "Steve Smith" <[email protected]>
> > To: <[email protected]>
> > Sent: Monday, June 24, 2002 10:17 PM
> > Subject: Re: [TheForge] that tired old phase converter question again
> >
> >
> >
> >>If you want a rotary converter but don't want to build it, all you need
> >>to do is get a static phase converter and use it to start an idler
> >>motor. Now you have a rotary converter.
> >>
> >>Steve Smith
> >>
> >>Mark A. Pesetsky wrote:
> >>
> >>>I did a search to see how much a purchased phase converter would be
> >>
> > because
> >
> >>>I
> >>>may need one in the near future as well.  I found that they are
> >>
> > expensive
> >
> >>>but
> >>>I also found a company that builds a panel that you hook up to your own
> >>>idler
> >>>motor.  The $325 for the panel sized for a 10hp motor might not be that
> >>>much
> >>>more than all the componnents you would need  to buy.
> >>
> > http://www.n-e-m.com
> >
> >>>John Newman
> >>>
> >>>Gladish Family wrote:
> >>>
> >>>Been buying motors and inverters from these people for a while
> >>
> > now...GREAT
> >
> >>>people to work with.
> >>>Look under the "Inverter Drives" section...If you don't see what you
> >>
> > need,
> >
> >>>give them a call. They don't always list all that they have in stock..
> >>>
> >>>Good Luck
> >>>Mark
> >>>
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> >>
> >>
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