Variable-Performance Proportional-Type Angle-Filtering System for Motor Drives

Yonghun Kim, Seok Kyoon Kim, Choon Ki Ahn

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


This brief proposes a proportional-type angle filter with the variable feedback gain mechanism for motor drives using the encoder for angle feedback. In this case, the angle measurement suffers from discontinuity that has to be made continuous through low-pass filters and observers. There are three features. The first designs a real-time feedback gain update rule to improve the closed-loop filtering performance by magnifying the feedback gain in transient periods. The second introduces the disturbance observer (DOB) in the resultant proportional-type feedback filter for enhanced disturbance attenuation against the speed variations. The third proves the useful properties of the filtering error convergence and performance recovery by investigating the filtering error dynamics. A prototype 500-W permanent-magnet synchronous motor (PMSM) drive system validates the practical advantages of the proposed technique.

Original languageEnglish
Article number9126867
Pages (from-to)511-515
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Issue number1
Publication statusPublished - 2021 Jan

Bibliographical note

Funding Information:
Manuscript received April 24, 2020; accepted June 23, 2020. Date of publication June 26, 2020; date of current version December 21, 2020. This work was supported in part by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education under Grant 2018R1A6A1A03026005, and in part by the NRF of Korea Grant funded by the Korea Government (Ministry of Science and ICT) under Grant NRF-2020R1A2C1005449. This brief was recommended by Associate Editor Y. Qin. (Corresponding authors: Seok-Kyoon Kim; Choon Ki Ahn.) Yonghun Kim is with the Center of Echo-Friendly and Smart Vehicles, Korea Advanced Institute of Science and Technology, Daejeon 34051, South Korea (e-mail:

Publisher Copyright:
© 2004-2012 IEEE.


  • Angle filtering
  • disturbance observer
  • performance recovery
  • variable feedback gain

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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