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Using Arduino => Motors, Mechanics, Power and CNC => Topic started by: capitali on Mar 13, 2013, 01:23 am

Title: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: capitali on Mar 13, 2013, 01:23 am
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 (http://www.seeedstudio.com/wiki/Motor_Shield_V1.0)
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: Chagrin on Mar 13, 2013, 04:34 pm
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.
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: MarkT on Mar 14, 2013, 01:46 am
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?
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: retrolefty on Mar 14, 2013, 02:30 am
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
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: capitali on Mar 14, 2013, 04:06 am
Hey thanks for all the replies... the PDF is now attached -- thanks for making me realize that hadn't gone as well.
Capital I
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: michinyon on Mar 14, 2013, 08:22 am
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 ?
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: kf2qd on Mar 14, 2013, 04:26 pm
His meter is probably reading 15 Ohms per phase with yellow as the common.
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: MarkT on Mar 14, 2013, 05:41 pm

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.
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: capitali on Mar 15, 2013, 11:07 pm
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?
Title: Re: Old six wire stepper motor... Seagate -- Not sure what I have
Post by: MarkT on Mar 16, 2013, 02:52 am
Well the 2004 has 7 darlingtons, so one package would suffice.