JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2017, Vol. 47 ›› Issue (3): 96-101.doi: 10.6040/j.issn.1672-3961.0.2016.298

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A position sensorless control strategy for BLDCM based on a fractional order sliding mode observer

LIANG Qiushi, ZHAO Zhicheng*   

  1. School of Electronic Information Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China
  • Received:2016-08-01 Online:2017-06-20 Published:2016-08-01

Abstract: In order to solve the problem of chattering and the phase delay in traditional sliding mode observer, the fractional order mode was introduced to the sliding mode observer design procedure. Combined with brushless DC motor(BLDCM)line voltage equation, the proposed sliding mode observer was designed by utilizing the slower energy transferring property of fractional order, which avoided observed phase delay in traditional integral order observer as a result of low pass filter existence. At the same time, the smooth assessment curve of line back electromotive force could be obtained, and the real-time and accurate rotor position signal and speed assessment value in this scenario could further be obtained. The simulation result indicated that the proposed sliding mode observer was able to observe the line back electromotive force of BLDCM accurately and achieve its position sensorless control.

Key words: brushless DC motors, position sensorless, sliding mode observer, fractional order, line back electromotive force

CLC Number: 

  • TP273
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