The major factor in this trend towards the stepper motor is the prevalence of digital control, the emergence of the microprocessor, improved designed, i.e. Note: For this discussion, stepper, stepping and step motor(s) are used interchangeably.Īlthough the stepper motor has been overshadowed in the past by servo systems for motion control, it has emerged as the preferred technology in more and more areas. The count automatically represents how much movement has been achieved, without the need for feedback information, as would be the case in servo systems, and other technologies.Īlthough not required, most stepper motors can accommodate an encoder when desired. Therefore, counting pulses can be applied in the stepper motor to achieve a desired amount of shaft rotation. Inherent in this concept is open-loop control, wherein a train of pulses translates into so many shaft revolutions, with each revolution requiring a given number of pulses.Įach pulse equals one rotary increment, or step (hence named, stepper, stepping, or step motor), which is only a portion of one complete rotation. The stepper motor is an electrical motor that is driven by digital pulses rather than a continuously applied voltage. This is the distinguishing feature of a stepper motor. One may assume that a stepper motor will dependably follow digital instructions, just as a computer is expected. Digital information is processed by the stepper motor to accomplish an end result, in this case, controlled motion.
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