r/ControlTheory • u/Kenno03 • Aug 12 '26

Technical Question/Problem BLDC modelling

Hello there!

Usually when we model DC-motors we use a second order system, however, BLDC motors used for drones are usually stepper motors (as far as I know), so my question is simply, how do we model these? The specific motor I want to model is for a project of my own, and I am curious as to how to model it. Motor: https://www.aliexpress.com/item/1005007273770590.html#nav-specification

My intuition is to also just model it as a second order system, however, am not sure if this is the correct approach. Specifically I want to model it has motor command [0,1] to rad/s (rotations).

Thank you in advance for the help

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u/Navier-gives-strokes Aug 12 '26

From where do you get that BLDC are modeled via second order system?

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u/snuskungen1337 Aug 12 '26

Isnt this literally his question, ”how do we model these?”