Stepping motors are electromagnetic incremental-motion actuators, which, when energized by a voltage and current input, index in given angular increments. Their inherent positional accuracy makes them suitable for a wide range of motion control and industrial positioning applications, especially when slow and precise movement is required. However, their speed is limited by their torque which diminishes when the applied pulse train becomes too fast. To be more adequate to the necessities of higher speed applications their behavior can be improved through better electrical controller and motor designs.
Neves, M. F. D. S. V., Valtchev, S. S., DEE Group Author, & Sousa, P. A. D. C. (2009). A New Open-Loop Control Method for Stepping Motor Driving. In - (pp. 605-610) https://doi.org/10.1109/POWERENG.2009.4915220