Definition
A stepper motor moves in discrete, fixed-angle steps rather than continuous rotation, with its position determined by counting the number of steps commanded, often without requiring a feedback device, unlike a servo motor's closed-loop design. It suits applications needing moderate precision positioning at lower cost and complexity than a full servo system.
Key facts
- Moves in discrete, fixed-size steps, distinct from a servo motor's continuous, closed-loop-controlled rotation.
- Position is often tracked simply by counting commanded steps (open-loop), without a feedback device, though this risks losing track if a step is missed under excessive load.
- Generally lower cost and complexity than a servo system, suited to applications with moderate precision and dynamic-response requirements.
- Risk of "missed steps" under excessive load or speed is a key limitation absent in closed-loop servo control.
How does Stepper motor work or appear?
A stepper motor works by energizing its windings in a specific sequence, each step advancing the rotor by a fixed, precise angle; a controller counts the number of steps commanded to track position, without necessarily needing feedback confirmation, as long as the motor does not lose synchronization under excessive load.
What should technicians inspect for Stepper motor?
A servo motor uses closed-loop feedback to continuously verify and correct actual position against command, tolerating disturbance and higher dynamic loads. A stepper motor typically runs open-loop, tracking position by counting commanded steps alone: simpler and often less expensive, but vulnerable to losing accurate position tracking if a step is missed under excessive load or speed.
FAQ
Frequently asked questions
How does a stepper motor produce step-by-step movement?
It energizes its windings in sequence, each step advancing the rotor a fixed angle, with position tracked by counting commanded steps, typically without the closed-loop feedback a servo motor uses.
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