Pot-less servos

[John Ferrell]

Steppers are available in a wide range. There are small ones in disk drives
and printers. The problem is that if there is no closed loop feedback to
assure that the commanded movement really happened, it could easily adopt a
new center position in a servo. Currently optics seem to provide the most
popular feed back in computer applications.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"



----- Original Message -----
From: "Michael Ramsey" <michaelr at flying-models.com>
To: <discussion at nsrca.org>
Sent: Thursday, March 27, 2003 9:31 AM
Subject: Re: Pot-less servos


> It's just a motor right? But a step motor moves in increments of measure.
Is
> that technology "pot-less". I've only heard about them, but have wondered
> how they might work for R/C use.
>
> Michael...
>
>
> ----- Original Message -----
> From: "Dean Pappas" <d.pappas at kodeos.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, March 26, 2003 5:05 PM
> Subject: RE: Pot-less servos
>
>
> What about stepper motors?
>
> -----Original Message-----
> From: Michael Ramsey [mailto:michaelr at flying-models.com]
> Sent: Wednesday, March 26, 2003 5:03 PM
> To: discussion at nsrca.org
> Subject: Re: Pot-less servos
>
>
> Does anyone know anything about "step" motors?
>
> Michael...
>
>
> ----- Original Message -----
> From: "Bill Glaze" <billglaze at triad.rr.com>
> To: <discussion at nsrca.org>
> Sent: Wednesday, March 26, 2003 5:40 PM
> Subject: Re: Pot-less servos
>
>
> > Remember the Bonner Mailbox?  Didn't have a potentiomenter; didn't need
> one!
> > Bill Glaze
> >
> > Dean Pappas wrote:
> >
> > > Hi John,
> > > Pot-less servos are our history! The old KPS-9 had a variable cap, and
> F&M sold a servo back in the same time period with a variable L-R
> multivibrator, called the Magnevac. But you remember that, don't you!
> > > Back as a fresh-out I wedged an optical unit into the variable cap
> housing of a KPS-9.
> > > I have no idea where it is, but I don't think I tossed it.
> > > Dean
> > >
> > > -----Original Message-----
> > > From: John Ferrell [mailto:johnferrell at earthlink.net]
> > > Sent: Tuesday, March 25, 2003 6:19 PM
> > > To: discussion at nsrca.org
> > > Subject: Re: New Futaba wc?
> > >
> > > Pot-less servos may be nearer than you think. Clarostat has rotary
hall
> > > effect devices available now.
> > >
> > > John Ferrell
> > > 6241 Phillippi Rd
> > > Julian NC 27283
> > > Phone: (336)685-9606
> > > Dixie Competition Products
> > > NSRCA 479 AMA 4190  W8CCW
> > > "My Competition is Not My Enemy"
> > >
> > > ----- Original Message -----
> > > From: "Koenig, Tom" <Tom.Koenig at actewagl.com.au>
> > > To: <discussion at nsrca.org>
> > > Sent: Tuesday, March 25, 2003 5:52 PM
> > > Subject: RE: New Futaba wc?
> > >
> > > >
> > > > Thanks Dean...now I'll be disappointed for a while. Maybe they will
do
> it
> > > > when they introduce their 'potless' servo's.<G> I too have been
> waiting
> > > for
> > > > these! I guess I'll keep dreaming.
> > > >
> > > > -----Original Message-----
> > > > From: Dean Pappas [mailto:d.pappas at kodeos.com]
> > > >
> > >
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