Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor

Thanks... that first link is nice.. I just wish I could find the docs for that chip... google-ing didn't find anything.. I should be able to determine power and ground by looking at the circuit board, etc.. but as to the signal... it may be harder to figure out... could be drivers, could be OC, etc. oh well, if I burn this one up, I can buy something else.

- jim

On Tue, 28 Nov 2006 12:50:33 EST
cnc002@... wrote:

>
> In a message dated 11/28/2006 12:16:48 P.M. Eastern Standard Time,
> mattison20@... writes:
>
> The gizmo is probably a quadrature encoder. See:
>
> http://www.sxlist.com/techref/io/sensor/pos/enc/quadrature.htm
>
> http://en.wikipedia.org/wiki/Rotary_encoder
>
> To figure the pinout you first need an idea how it works.
> --
> Phil Mattison
> http://www.ohmikron.com/
>
> ----- Original Message -----
> From: James Washer <washer@...>
> To: <CAD_CAM_EDM_DRO@yahoogroups.com>
> Sent: Monday, November 27, 2006 10:56 PM
> Subject: [CAD_CAM_EDM_DRO] Help understanding servo motor
>
>
> > I have a couple of small servo motor pulls from a big plotter. On one end
> of the motor is a "gizmo" that has a few electronic components (mostly
> resisters, an LED, and clear plastic disk attached to the motor shaft, a
> couple of pots, and an 8pin chip marked with the Mitsubishi logo and the
> designation M393)
> >
> > So.. I'm guessing this is the rotational positional counter gizmo (forgive
> me for not knowing the correct terms).
> >
> > Anyway, can I use this? any tricks to figure out the pinout (looks like
> about 5 pins of a 10 pin ribbon cable are connected)
> >
> > - jim
>
>
>
> Jim:
>
> If the clear disk that is attached to the shaft has marks or "slots" on it
> then the "gizmo" is almost certainly an encoder. Most likely it is a
> quadrature incremental encoder.
>
>
> Randy Abernathy
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