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Topic: Old six wire stepper motor... Seagate -- Not sure what I have (Read 1 time) previous topic - next topic

capitali

Mar 13, 2013, 01:23 am Last Edit: Mar 14, 2013, 04:03 am by capitali Reason: 1
I have an old seagate stepper motor... I have have not been able to decide on the wiring.. I'm betting someone else already knows...

I've attached a PDF with a photo.. the below resistance pinnout table, and the multimeter doing the test.
























*******RedBlueGreenYellowBrownOrange
Red*******0.030.030.0150.030.03
Blue0.03*******0.030.0150.030.03
Green0.030.03*******0.0150.030.03
Yellow0.0150.0150.015*******0.0150.015
Brown0.030.030.030.015*******0.03
Orange0.030.030.030.0150.03*******




I am interested both in what I have here and also how it would, and if it could, work with a http://www.seeedstudio.com/wiki/Motor_Shield_V1.0

Chagrin

Sounds like you have a five phase unipolar stepper. Would work just like a typical, four phase unipolar motor but with one extra phase to deal with.

Your PDF is missing btw.

MarkT

Well you could also view it as a five-phase AC motor with windings in a star arrangement and the common
point brought out as the yellow wire.  You next need to establish the order of phases and look up ways to
drive a five-phase motor (unipolar will be the simplest, but not the best).

Are those values really ohms?  0.015 ohms?
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retrolefty

#3
Mar 14, 2013, 02:30 am Last Edit: Mar 14, 2013, 02:34 am by retrolefty Reason: 1
Couldn't it also be a four phase stepper using two center-tapped windings, thus 6 wires?
An ohm meter should help you prove how many winding you have and if center-tapped or not.
Lefty

capitali

Hey thanks for all the replies... the PDF is now attached -- thanks for making me realize that hadn't gone as well.
Capital I

michinyon

Quote
Couldn't it also be a four phase stepper using two center-tapped windings, thus 6 wires?


If that was right,  why would only the yellow wire have a unique resistance to the other wires ?

kf2qd

His meter is probably reading 15 Ohms per phase with yellow as the common.

MarkT


Couldn't it also be a four phase stepper using two center-tapped windings, thus 6 wires?
An ohm meter should help you prove how many winding you have and if center-tapped or not.
Lefty



Not with those measured resistances.
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capitali

So could I use a pair of ULN2004AN darlington arrays to achieve all five phases?
4 through the first ULN2004AN and 1 through a second? -- seems like that would work?

MarkT

Well the 2004 has 7 darlingtons, so one package would suffice.
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