Double-stage back electromotive force observer of permanent magnet synchronous motor considering sliding mode chattering
WEI Hai-feng
WEI Han-pei
ZHANG Yi
Abstract：Since position detection and speed estimation of permanent magnet synchronous rotor based on traditional back electromotive force (EMF) sliding mode observer are not accurate because of chattering, a new kind of double-stage back EMF observer is proposed based on traditional primary sliding mode observation. In order to obtain the more smooth and accurate back EMF optimal value, the state observation equation of back EMF is constructed to filter out the high frequency ripple component outputted from primary observer, and Lyapunov stability theory is used to prove the convergence. Meanwhile, the given of observer gain coefficient and low pass cutoff frequency are considered. The observation coefficient is selected according to real-time speed feedback, and this makes it follow the speed change to get the optimal observation. Variable cutoff frequency is designed to reduce phase compensation calculation of low pass filter by processor. Contrast simulation and experiment results verify improved double-stage observer algorithm is effective and practical.
Keywords：permanent magnet synchronous motorsliding mode chatteringdouble-stage observeroptimal back EMF
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 738-745 )