Chapter 15

Stepper Motors

15.1  Description and Operation

A simple DC motor rotates when a voltage is applied to its terminals; therefore its control is quite simple. Stepper motors, on the other hand, convert electrical pulses into discrete units of rotational movement, which can be controlled independently and without a feedback mechanism. Typically, the shaft or rotor is toothed, while the stator contains several windings that are energized in a specific order. The electro-magnetic attraction of the windings force the alignment of the toothed rotor thus producing rotation. Figure 15-1 is a diagram of a stepper motor with eight windings and six teeth on the rotor.

Figure 15-1  Cross-Section of a Typical Stepper Motor.

The motor of Figure 15-1 ...

Get Embedded Systems Circuits and Programming now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.