Electronic Science and Technology ›› 2021, Vol. 34 ›› Issue (12): 1-6.doi: 10.16180/j.cnki.issn1007-7820.2021.12.001

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A Novel Sliding Mode Observer for Position Sensorless Control of Permanent Magnet Synchronous Motor

TONG Zhaojing1,ZHENG Quan1,HAN Yaofei2,HE Guofeng2,QIN Zini1   

  1. 1. School of Electrical Engineering and Automation,Henan Polytechnic University,Jiaozuo 454000,China
    2. School of Electrical and Control Engineering,Henan University of Urban Construction,Pingdingshan 467036,China
  • Received:2020-07-30 Online:2021-12-15 Published:2021-12-06
  • Supported by:
    National Natural Science Foundation of China(U1504623)


In this study, a novel variable gain sliding mode observer is proposed to eliminate the chattering of traditional sliding mode observer and the phase delay of rotor position estimation. The designed sliding mode gain can vary with the back EMF value, and the back EMF observer, instead of the low-pass filter, is used to reduce the high frequency signal and chattering of the back EMF estimation value. The mathematical model of position sensorless control system is established, and the novel sliding mode observer is compared with the traditional sliding mode observer. The results show that the error of the new sliding film observer speed in steady state, acceleration and loading conditions is significantly reduced, which proves that the proposed new sliding mode observer has smaller chattering and higher accuracy.

Key words: permanent magnet synchronous motor, sliding mode observer, back EMF, sliding mode gain, back EMF observer, Lyapunov function, the rotational speed observation, vector control

CLC Number: 

  • TP202