Otherwise, the default is the stepper due to simple drive electronics, good accuracy, good torque, moderate speed, and low cost.Ī stepper motor positions the read-write heads in a floppy drive. High acceleration or unusually high accuracy still requires a servo motor. The expense and complexity of a servomotor are due to the additional system components: position sensor and error amplifier) It is still the way to position heavy loads beyond the grasp of lower power steppers. Today this is a higher cost solution to high-performance motion control applications. And, microprocessors readily interface to stepper motor driver circuits.Īpplication-wise, the predecessor of the stepper motor was the servo motor. Modern solid-state driver electronics was a key to its success. The widespread acceptance of the stepper motor within the last two decades was driven by the rise of digital electronics. When stopped but energized, a stepper (short for stepper motor) holds its load steady with a holding torque. The rotor moves in discrete steps as commanded, rather than rotating continuously like a conventional motor. A stepper motor is a “digital” version of the electric motor.
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January 2023
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