----- Original Message -----
> You sure it's a stepper? Are you sure it's not burnt out?
>
I agree the results are strange.  I rechecked them just to make sure, and
still the 2.00 ohms for all 3 connections as stated earlier.  It was
definitely marketed as a "stepper motor".  The only thing I can figure is
that maybe there is some sort of control circuit built in.  I'm also pretty
sure it's not burnt out since I haven't run it yet, and both the ones I have
exhibit identical readings.


> With nine wire I'd think brushless three phase. Or maybe somthing with a
> tach, or encoder of some kind.


> Looking at your ohmmeter results I have to wonder. If a->b = 2 ohms and
> b->c = 2 ohms shouldn't a->c = 4 ohms? Might there a diode in there? Did
> you just leave it out?

It would be that way if its center tapped, but since they're all 2 ohms I'd
guess it indicates 3 separate and independent coils.

I'd rather not have to open one up, but if it comes down to it then I guess
it's a good thing I have 2 ;->

D

>
>
> ----- Original Message -----
> From: "D Yates" <piclist@NERDULATOR.NET>
> To: <PICLIST@MITVMA.MIT.EDU>
> Sent: Wednesday, December 03, 2003 12:17 PM
> Subject: [EE:] Another Stepper Motor question
>
>
> > I recently picked up a stepper motor with 9 wires, but can't find any
> > documentation about a 9-wire stepper motor!  An attack with the
ohm-meter
> > revealed 3 wires (a,b,c - see below) with a 2.00 ohm resistance between
> each
> > pair of wires, and the rest have either infinite resistance or 5-10
Mohms
> > resistance.  Any ideas what's going on here or how to control it?
> >
> > a -> b = 2.00 ohms
> > a -> c = 2.00 ohms
> > b -> c = 2.00 ohms
> >
> > If it helps, the wire colors are:
> >
> > a: brown
> > b: yellow
> > c: orange
> >
> > and the rest are black, red, purple, blue, white, and green.

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