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Author Topic: Old six wire stepper motor... Seagate -- Not sure what I have  (Read 945 times)
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Chandler
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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


* Seagate stepper.pdf (812.38 KB, 612x792 - viewed 62 times.)
« Last Edit: March 13, 2013, 10:03:53 pm by capitali » Logged

Dubuque, Iowa, USA
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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.
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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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Left Coast, CA (USA)
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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
« Last Edit: March 13, 2013, 08:34:10 pm by retrolefty » Logged

Chandler
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Hey thanks for all the replies... the PDF is now attached -- thanks for making me realize that hadn't gone as well.
Capital I
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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 ?
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South Texas
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His meter is probably reading 15 Ohms per phase with yellow as the common.
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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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Chandler
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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?
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Well the 2004 has 7 darlingtons, so one package would suffice.
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