Model-Free Observer for Speed and Acceleration Estimations for Speed Servo System Applications

Seok Kyoon Kim, Kwan Soo Kim, Sun Lim, Choon Ki Ahn

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


This brief presents a speed and acceleration estimation mechanism combining a Luenberger-Type observer and a nonlinear second-order disturbance observer (DOB) using servo system angle measurements without system parameters and load information. The resultant observer has the following two contributions: (a) the inclusion of a system parameter information-free nonlinear DOB as a subsystem to ensure improved robustness and (b) the capability of performance assignment by tuning the scalar design factor without involving any matrix calculation processes. An experimental study validates the practical advantage of the proposed solution using a prototype 500 W dynamo system as a speed servo system.

Original languageEnglish
Pages (from-to)4944-4948
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number12
Publication statusPublished - 2022 Dec 1

Bibliographical note

Publisher Copyright:
© 2004-2012 IEEE.


  • State estimation
  • disturbance estimation
  • nonlinear filtering
  • servo systems

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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