RE: [CAD_CAM_EDM_DRO] Re: servo driver on a chip ?

Hi Dave, Dennis,

How about the PIC-SERVO?

http://www.jrkerr.com/

It has encoder and Hall-effect sensor inputs.

HP had a motor control chip out a long time ago. HP1000?

Alan KM6VV

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Dennis Schmitz"
> <denschmitz@...> wrote:
> >
> > It might be totally different inside, but it still performs the same
> > function, taking command input and controlling something based on it.
>
>
> I think the general concept of a close loop would fit both. the
> difference being the type of sensors. Although I don't think there is
> a specific requirement for any type of sensor, the R/C servos would
> not require anything that might be unlimited. whereas a
> MotionControl Servo certainly would find it hard to use a fixed range
> device like a pot. The main difference being that the R/C unit might
> not have to make a full revolution, whereas the MC applicion offen has
> many hundreds of revolutions.
>
> But the concept of monitoring the error and correcting for that would
> be common to both.
>
> I think the whole concept of a serial command vs. parrallel commands
> is being used in more than a few devices.
>
> The idea is to be able to use a driver with something like Mach3 that
> does output a step and direction signal.
>
> As I understand, allegro and Sanken as well as some others put
> complete circutis on a chip. Allegro puts a stepper driver on a chip.
>
> At some point someone should put a quadrature interface on a chip as
> well as a motor controller to make a single chip device that would run
> the items necessary to make a MC servo on a chip.
>
> MicroChip does have an application bulletin that gives all the details
> to put all the bits together to make a stepper drive on a PIC.
>
> And, putting the whole thing in software would be fine as well.
>
> So, I guess that is the real question. Is there a means of putting
> together a motion control servo driver ?
>
> Dave
>