General Information
    • ISSN: 1793-8201 (Print), 2972-4511 (Online)
    • Abbreviated Title: Int. J. Comput. Theory Eng.
    • Frequency: Quarterly
    • DOI: 10.7763/IJCTE
    • Editor-in-Chief: Prof. Mehmet Sahinoglu
    • Associate Editor-in-Chief: Assoc. Prof. Alberto Arteta, Assoc. Prof. Engin Maşazade
    • Managing Editor: Ms. Mia Hu
    • Abstracting/Indexing: Scopus (Since 2022), INSPEC (IET), CNKI,  Google Scholar, EBSCO, etc.
    • Average Days from Submission to Acceptance: 192 days
    • APC: 800 USD
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Prof. Mehmet Sahinoglu
Computer Science Department, Troy University, USA
I'm happy to take on the position of editor in chief of IJCTE. We encourage authors to submit papers concerning any branch of computer theory and engineering.

IJCTE 2015 Vol.7(2): 92-96 ISSN: 1793-8201
DOI: 10.7763/IJCTE.2015.V7.937

Disturbance Observer Structure Applied to Sensorless Brushless DC Motors Drive

Samuel Wang, Chin-Hsuan Lu, and An-Chen Lee

Abstract—In a permanent magnet (PM) brushless dc motor (BLDC), the performance of Hall effect sensors are not reliable in some applications. The back electromotive force (back-EMF) signal is used instead since the zero-crossing points of back-EMF can be used to provide the rotor position information. In this paper, a new back-EMF difference detection method based on disturbance observer is proposed. The proposed structure can detect the back-EMF as well as back-EMF difference signal. The zero-crossing points of the back-EMF difference can be used directly for commutation, requiring no phase shift. Simulation and experiment results are provided to show the feasibility of the proposed method.

Index Terms—Back electromotive force (EMF), brushless DC motor, disturbance observer, sensorless.

Samuel Wang and An-Chen Lee are with the National Chiao Tung University, Hsinchu, Taiwan (e-mail: samuel6113@,
Chin-Hsuan Lu was with National Chiao Tung University, Hsinchu, Taiwan. He is with the DELTA, Taoyuan, Taiwan (e-mail:


Cite: Samuel Wang, Chin-Hsuan Lu, and An-Chen Lee, "Disturbance Observer Structure Applied to Sensorless Brushless DC Motors Drive," International Journal of Computer Theory and Engineering vol. 7, no. 2, pp. 92-96, 2015.

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