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Why is the stepper control system commonly used in the open-loop form?

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Why is the stepper control system commonly used in the open-loop form? What are the drawbacks?

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Key points of the answer:

1) The angular displacement of the stepper motor is precisely synchronized with the control pulse.

2) There is no accumulation error in stepper motor.

Disadvantages: often caused by high frequency or other reasons caused by step loss, no closed-loop system has strong anti-interference ability.

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