Pot-less servos

[STEVE HOSNER]

Stepper motors.
Great holding power if driven correctly. Really suck up the power.
I have a few .1 degree stepper motors but they are pretty large about 3/4"
dia.
Each time the coils are energized the motor will rotate in steps. The ones I
have been working with move .1 degree with each input pulse. If geared
properly they might work fairly well. I have seen several driver chips for
the motors that might provide the basics
of control that we would need but much more external circuitry would have to
be developed.
Another drawback is cost. The ones I have used sell for about $60 or so.

Steve


----- Original Message -----
From: "Michael Ramsey" <michaelr at flying-models.com>
To: <discussion at nsrca.org>
Sent: Wednesday, March 26, 2003 3:02 PM
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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