Cho mình hỏi phát:
- servo mode khác với step mode ở chổ nào? Trong clip không thấy sự khác biệt.
- step chạy êm ở tốc độ chậm thì rất nhiều driver có thể làm việc này. Theo mình biết thì có thể nâng vi bước để bước mịn hơn khi chạy chậm. Mô phỏng sin chính xác hơn giúp motor mượt hơn.

Định nghĩa servo trích từ https://en.m.wikipedia.org/wiki/Servomechanism
A servomechanism, sometimes shortened to servo, is an automatic device that uses error-sensing negative feedback to correct the performance of a mechanism and is defined by its function.[1] It usually includes a built-in encoder.[2] A servomechanism is sometimes called a heterostat since it controls a system's behavior by means of heterostasis.

The term correctly applies only to systems where the feedback or error-correction signals help control mechanical position, speed or other parameters.[3] For example, an automotive power window control is not a servomechanism, as there is no automatic feedback that controls position—the operator does this by observation. By contrast a car's cruise control uses closed loop feedback, which classifies it as a servomechanism.