Why stepper motors are popular in digital automation Stepper motors have become popular in digital automation systems because ________.
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Aof their low cost
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Bthey are driven by sequential digital signals
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Cthey can be used to provide repetitive mechanical movement
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Dthey are driven by sequential digital signals and can be used to provide repetitive mechanical movement
Answer
Correct Answer: they are driven by sequential digital signals and can be used to provide repetitive mechanical movement
Explanation
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:
Identify key benefit 1: digital sequencing directly drives motion.Identify key benefit 2: inherent stepwise motion yields repeatability.Combine both for the most complete explanation of popularity.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