Why stepper motors are popular in digital automation Stepper motors have become popular in digital automation systems because ________.

Introduction / Context:
Stepper motors bridge digital control and mechanical motion. They move in discrete steps when coils are energized in a sequence, making them ideal for printers, CNC axes, and robotics where repeatable positioning is required.

Given Data / Assumptions:

• Digital controllers can output timed sequences easily.
• Applications need repeatable, incremental motion.
• Feedbackless (open-loop) operation is often sufficient due to step quantization.

Concept / Approach:

Sequential digital drive (full-step, half-step, microstepping) energizes phases to produce controlled rotor increments. Because each pulse advances the motor by a known angle, repetitive movements are straightforward to generate and repeat.

Step-by-Step Solution:

Verification / Alternative check:

Common drive ICs and microcontroller libraries implement phase sequences; applications like 3D printers rely on precise repetitive movements without encoders at moderate loads.

Why Other Options Are Wrong:

• Low cost alone is not the main reason.
• Only sequential drive or only repetitive motion is incomplete; popularity stems from both features together.

Common Pitfalls:

• Assuming stepper speed/torque equals servo performance; steppers excel mainly in controlled, repetitive positioning.

Final Answer:

they are driven by sequential digital signals and can be used to provide repetitive mechanical movement