Rikard,

 If you take resistance readings between each of the wires, put the
values in a matrix, you'll  be able to 
 see the commonlead of each winding pair from those readings.  Then
write down the color code for that motor
 along side the resistance readings.  Do this for each motor.  Not
really quick, but it will be accurate.   
 I've done this on several motors I acquired, and all have worked fine.
Most of them are still working to 
 this day.  The ones that aren't didn't fail.  They were just taken out
of service because the fixture they 
 were in was no longer needed. They are now waiting to be reused in
another test fixture.


	
Regards,

	
Jim
 

-----Original Message-----
From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf
Of Rikard Bosnjakovic
Sent: Thursday, March 06, 2008 12:17 PM
To: Microcontroller discussion list - Public.
Subject: [EE] Finding stepper-motor pin configurations

So, I got a bunch of stepper motors (unipolar I think, six cables).
None of the motors have the same color schemes of the cables, and I have
no datasheets.

Is there an empirical method to find out which of the six cables is
which?


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