The Step Motor is an electromagnetic device that converts digital pulses into mechanical shaft rotation. The following schematic shows the 4 Wire Series/Parallel Stepper Motor Wiring Configuration. The driver will typically feature 4 connections to connect the motor: a + and – connection for each of the 2 phases. Wiring up a 4 lead motor is therefore straightforward. When using bifilar motors with 8 leads, the coils can either be connected in series or in parallel as shown in the diagrams.
A series connection provides a high inductance and therefore greater performance at low speeds. While parallel connection will lower the inductance but increase the torque at faster speeds.