I purchased surplus Vexta, 8 wire unipolar motors and the supplier
claims that they can be configured for unipolar or bipolar operation.
Their bipolar documentation suggests that the center taps are connected
(8 wire case) and ignored.   I am using the motors in unipolar mode so I
can't validate the suppliers claim.  Hope to hear from others on
performance issues.

George


-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU] On Behalf Of Jim Tellier
Sent: Wednesday, December 03, 2003 10:48 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: [EE:] Stepper Motor question

Can anyone tell me if it's OK to use a "unipolar" stepper (i.e. one that
has center-tapped coils) *as* a "bipolar"?   i.e., just ignore the
center tap and use the two series-connected coils as one.  I realize
that this might not be as low of a resistance value as what I might see
with an actual "bipolar" single-coil device, but the question is... will
it work?   My instinct is that it should, but perhaps with less startup
torque.  What say you all ?
Thanks!
Jim

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