Sensorless control of permanent magnet synchronous motor based on nonsingular terminal sliding mode observer
In the sensorless control of permanent magnet synchronous motor based on sliding mode observer(SMO),both the convergence speed and the inherent chattering of SMO can affect the control performance of the system.For this case,a nonsingular terminal sliding mode observer(NTSMO)is designed to realize sensorless control of permanent magnet synchronous motor.First-ly,the integral nonsingular fast terminal sliding mode surface is constructed to make the current observation error converge to zero quickly in a finite time to avoid the singularity problem.Second-ly,the phase locked loop method is utilized to obtain the position and speed of the rotor from the observed back electromotive force,which can not only simplify the system,but also get a smoother estimation of the rotor position and speed.Finally,the stability of the observer is proved by Lya-punov function and verified by Simulink software.The results show that NTSMO can accurately estimate the speed of permanent magnet synchronous motor,the rotor position error is small and the static response is good.Compared with the traditional SMO,NTSMO has faster convergence speed,smaller back electromotive force chattering and better system control performance.
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