Stepper Motor Windings

• From [1] and elsewhere, it says that to reverse bipolar stepper motor direction, you switch only one winding. However, in RAMPS OSE work - reversing (flipping) the entire plug means you are reversing both pairs of coils, no? So in practice, it seems that reversing BOTH windings makes for opposite direction spin.

Links

• How to reverse direction of a stepper motor by wiring - [2]
• Stepper Motors on Wikipedia - [3]
• Different types of steppers explained at All About Circuits - [4]