You may be confusing 0.72 degree per step 5-phase step motors with 1.8 degree 2-phase step motors having a common center tap.
2-phase step motors require 2 coils, so that's 4 wires. If each winding is center-tapped and these taps are brought out, you have a 6-wire stepper.
If, sadly, these center-taps are internally connected and the resulting common is brought out, you have a 5-wire 2-phase motor that is usable only with an L/R drive.
It cannot be used with any high performance drive because of the interconnection between windings. A manufacturer that does this to a motor just to save the cost of a single wire should be covered with honey and be staked out over an anthill.
Mariss |