Well, thinking about it, you have three wires in a classic "delta" config, like so: A / \ / \ 2 ohms 2 ohms / \ / \ B--2 Ohms --C That's what I'd expect to see for a three phase brushless, the other wires make me wonder though... Are all the wires the same size (diameter)? What kind of plug on the wire (if any)? I'm thinking that if you can tell that some were meant to carry more current than the others... Maybe the other 6 wires are for somthing else. Do you have any other specs for the motor? Volts? Amps? Manufacturer info? -Denny > ----- 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" > > To: > > 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. > > -- > http://www.piclist.com hint: PICList Posts must start with ONE topic: > [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads