Discussion
Consider the following statements about stepper motors.
1. They are usually run open loop.
2. A lost step is not corrected.
3. Microstepping increases the resolution available.
Which of the statements are correct?
Answer: B
Correct answer: 1, 2 and 3
All three are correct and the first two go together: because a stepper is normally run open loop, nothing detects a lost step and the position error persists until the axis is re-homed. Microstepping subdivides each full step by proportioning the phase currents, improving resolution and smoothness - though the accuracy of an individual microstep is much poorer than that of a full step.
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