rad and coolant,

[Clare Snyder]

Jeffrey Engel wrote:
> 
> I don't think your control would have to be that precise.  How about
> using a PM motor geared down to give the torque required and a
> potentiometer as a position feedback.  You could either use an 'H'
> bridge to reverse directions or regulate one side of the motor to 6
> volts and use only two transistors on the other.  It shouldn't have
> to move often, so effiency shouldn't be a big factor.
> 
> =====================================
> > Date:          Thu, 23 Oct 1997 08:26:00 -0500
> > From:          dave.williams at chaos.lrk.ar.us (Dave Williams)
> > Subject:       Re: rad and coolant,
> > To:            DIY_EFI at coulomb.eng.ohio-state.edu
> > Organization:  The Courts of Chaos * Jacksonville AR USA * 501-985-0059
> > Reply-to:      diy_efi at coulomb.eng.ohio-state.edu
> 
> >
> > -> Well you could do that, but I was kinda thinking of a ball valve and
> > -> a stepper motor, there's gotta be some out there already. It's also a
> > -> lot easier from the packaging/plumbing standpoint, and I would think
> > -> would afford infinite control within system capabilities.
> >
> >  I'd love to find something like that.  All of the commercial valves
> > I've seen take more torque than a reasonably-sized stepper can give, so
> > it didn't look practical to cobble something up from pieces.
> >
> >
> >
> je
> jengel at fastlane.net
> 
>      "I can resist anything but temptation"
>                                   Mark Twain
Just get a good R/C type servo unit, or the trim tab servo ftom a lite
plane and connect it to a valve of your choice. Feedback pot tells
controller valve position - use a Digi-Prop control.
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