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Hi Fred,
The explanation at the start of the attached re bi and unipolar motors may help.
It sounds as if your unipolar motors are 5 wire with the "centre taps" of each pair of coils connected internally. I am not sure if you can drive these with a bipolar driver due to this internal connection. If you have 6 or 8 wire unipolar motors though that is different and you just need to connect them so you effectively have one coil on each side.
Hope this helps as I am no great expert.
Neale
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