It is a unipolar stepper motor with 5 wires:red: power connector, I have it at 5V and works fineorange and black: coil 1brown and yellow: coil 2
There's another recent thread on this - in brief with care you can cope with 5 wire and bipolar drive, but you have to be careful. The insight is that the centre of each winding is common,but if each winding is energized then the centre will be at V/2 so commoning them isn't a problem.In fact each winding can either be energized or completely open-circuit, no where inbetween.
If you treat a 5-wire motor as bipolar but always energize both coils, the centre of each coil must be atV/2 whichever way round you energize it. This is not the normal way of driving bipolar motors though.Of course to treat a 5-wire as bipolar you have to identify the phases correctly.
do you mean that supply voltage of 'V/2' volts needs to be applied to the centre of each coil?
No. If you apply "V" to one end of the coil and ground the other end, the center tap is at potential V/2. It also doesn't matter which end is at "V".5-wire steppers work fine with bipolar motor drivers, but use full step mode only.
Yes, but it requires non-standard drive mode - so no-one does it.