Journal of Xidian University ›› 2023, Vol. 50 ›› Issue (1): 93-101.doi: 10.19665/j.issn1001-2400.2023.01.011

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System delay compensation method for PMSM sensorless control

LI Wenzhen(),LIU Jinglin()   

  1. School of Automation,Northwestern Polytechnical University,Xi’an 710129,China
  • Received:2022-03-21 Online:2023-02-20 Published:2023-03-21

Abstract:

A position observation strategy considering system delay compensation is presented to avoid the position estimation error caused by analog and digital delay of the permanent magnet synchronous motor drive.First,a typical sliding-mode observer is established and the accessibility of sliding mode motion is analyzed.Second,the influence of analog circuits on the stator current is studied,and the transfer functions of analog circuits are derived.The total delay phase caused by the sampling circuit on the stator current is calculated.Third,the current error from digital implementation of the sliding-mode observer is analyzed.Fourth,a direct signal compensation method used for eliminating the influences of the current error is presented.The proposed strategy lowers the detection error of the sliding-mode observer and the transient process time in closed-loop control.Finally,the proposed strategy is experimentally verified to confirm its merits on system delay effect elimination and system control performance improvement.

Key words: sensorless control, digital implementation, system delay

CLC Number: 

  • TM351