Robust sensorless control for brushless DC motor against sudden disturbance and validation under change of back electromotive force constant

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Sensorless control of brushless DC motors (BLDCMs) by detecting back electromotive force (back-EMF) is widely used because of ease of equipment. As conventional method, back-EMF detecting method by using phase lock loop (PLL) is used. This method uses the nature that back-EMF of γ-axis is related to estimated angular error. As usual, back-EMF of d-axis is zero in the case of using position sensor. To compensate estimated angular error becomes zero, PLL is used. However, this method assumes that estimated angular error is very small so that PLL is not able to deal with sudden disturbance. In this paper, back-EMF detection method by using back-EMF estimation observer (BEOB) is proposed. Proposed method is able to derive not only estimated angle error but also estimated angular velocity directly. To estimate angular velocity correctly, disturbance observer (DOB) is able to be applied, and robust angular velocity control can be achieved. Then, validation under change of back-EMF constant is conducted with experiments. Back-EMF constant changes due to parameter error and environmental temperature. Therefore, comparison of PLL, method and proposed method under change of back-EMF constant is conducted. Validity of proposed method was confirmed by experiments.

Original languageEnglish
Title of host publicationProceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society
PublisherIEEE Computer Society
Pages2892-2897
Number of pages6
ISBN (Electronic)9781509034741
DOIs
Publication statusPublished - 2016 Dec 21
Event42nd Conference of the Industrial Electronics Society, IECON 2016 - Florence, Italy
Duration: 2016 Oct 242016 Oct 27

Other

Other42nd Conference of the Industrial Electronics Society, IECON 2016
CountryItaly
CityFlorence
Period16/10/2416/10/27

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Keywords

  • Back-EMF
  • Back-EMF Estimation Observer
  • BLDCM
  • Brushless DC Motor
  • Disturbance Observer
  • Periodical Inertial Load
  • Position Sensorless Control

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Electrical and Electronic Engineering

Cite this

Nakai, K., Nozaki, T., & Murakami, T. (2016). Robust sensorless control for brushless DC motor against sudden disturbance and validation under change of back electromotive force constant. In Proceedings of the IECON 2016 - 42nd Annual Conference of the Industrial Electronics Society (pp. 2892-2897). [7793463] IEEE Computer Society. https://doi.org/10.1109/IECON.2016.7793463