AN3208

Winding arrangement in two-phase stepper motors

Doc ID 17411 Rev 1

5/19

1

Winding arrangement in two-phase stepper motors

There are two basic winding arrangements for the electromagnetic coils in a two-phase

stepper motor: bipolar and unipolar.

The unipolar stepper motor has two identical coils which are not connected electrically and

each coil has a centre tap.

Figure 1.

Unipolar winding arrangement

The bipolar stepper motor is the same as the unipolar stepper except the motor coils do not

have the center taps. Bipolar motor can produce higher torque in comparison to the unipolar

motor as the entire coil is energized and not just half-coils.

Figure 2.

Bipolar winding arrangement