Improved sensorless vector control system for permanent magnet synchronous motors based on hyperbolic tangent functions

被引：0
作者：
Zhang P. [1 ]
Shi Z. [1 ]
Lin J. [1 ]
Yu B. [1 ]
Sun Y. [1 ]
Ding H. [1 ]
机构：
[1] Beijing Engineering Research Center of Precision Measurement Technology and Instruments, Beijing University of Technology, Beijing
来源：
Harbin Gongcheng Daxue Xuebao/Journal of Harbin Engineering University | 2021年 / 42卷 / 05期
关键词：
Chattering; Hyperbolic tangent function; Kalman filter; Permanent magnet synchronous motor; Sensorless control; Sliding mode observer; Vector control;
D O I：
10.11990/jheu.202001021
中图分类号：
学科分类号：
摘要：
This study proposes an improved sensorless control method for sliding mode observers to solve the problems of high-frequency chattering and poor observation accuracy in the sensorless control systems of permanent magnet synchronous motors. The hyperbolic tangent function is used to replace the traditional switching function. The estimation algorithm of the rotor position of the sliding mode observer is derived from the hyperbolic tangent function. The Lyapunov stability analysis method is used to analyze the stability of the system, and sufficient conditions for entering the sliding mode surface are obtained. A Kalman filter is utilized to filter the back electromotive force, and a phase-locked loop is used to obtain the rotor position. Results reflect the great improvement of observation accuracy in terms of speed and position. The simulation model of the improved sliding mode observer is built on the Simulink platform, and the results are compared with those of the switching and saturation functions. Results indicate that the starting process of the improved sliding mode observer is stable and that the high-frequency chattering in the steady-state operation process is obviously weakened. The improved sliding mode observer achieves high observation accuracy, strong anti-interference ability, and stability. Copyright ©2021 Journal of Harbin Engineering University.
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页码：710 / 718
页数：8
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