Re: [CAD_CAM_EDM_DRO] Re: Help understanding servo motor

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
4626 Old Stilesboro Road NW
Acworth, GA 30101-4066
E-mail: cnc002@...

I furnish technical support, repair, and other related services for your
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