Speed control for the lateral swing of aerial cameras based on an improved extended state observer

2018 ◽  
Vol 41 (2) ◽  
pp. 124-131 ◽  
Author(s):  
Bingyou Liu ◽  
Chang’an Zhu ◽  
Yi Jin
Keyword(s):  
Speed Control ◽  
State Observer ◽  
Extended State Observer ◽  
Extended State

scholarly journals An Adaptive Nonlinear Extended State Observer for the Sensorless Speed Control of a PMSM

2015 ◽  
Vol 2015 ◽  
pp. 1-14 ◽  
Author(s):  
Minggang Gan ◽  
Chenyi Wang
Keyword(s):  
Electromotive Force ◽  
Estimation Error ◽  
Permanent Magnet Synchronous Motor ◽  
Speed Control ◽  
State Observer ◽  
Lyapunov Theory ◽  
Extended State Observer ◽  
Rotor Speed ◽  
Extended State ◽  
Nonlinear Extended State Observer

This paper presents a sensorless speed control strategy for a permanent-magnet synchronous motor (PMSM) based on an adaptive nonlinear extended state observer (ANLESO). In this paper, an extended state observer (ESO), which takes back-EMF (back electromotive force) as an extended state, is used to estimate the rotor position and the rotor speed because of its simpler structure and higher accuracy. Both linear ESO (LESO) and nonlinear ESO (NLESO) are considered to estimate the back-EMF of PMSM, and NLESO is finally implemented due to its obvious advantage in convergence. The convergence characteristics of the estimation error of the observer are analyzed by the Lyapunov theory. In order to take both stability and steady-state error into consideration, an adaptive NLESO is proposed, which adaptively adjusts the parameters of NLESO to a compromised value. The performance of the proposed method was demonstrated by simulations and experiments.

scholarly journals Speed control for permanent magnet synchronous motor based on an improved extended state observer

2018 ◽  
Vol 10 (1) ◽  
pp. 168781401774766 ◽  
Author(s):  
Bingyou Liu
Keyword(s):  
Control System ◽  
Permanent Magnet ◽  
Permanent Magnet Synchronous Motor ◽  
Speed Control ◽  
Synchronous Motor ◽  
State Observer ◽  
Extended State Observer ◽  
Motor Speed ◽  
Extended State ◽  
Speed Control System

An improved extended state observer is designed to eliminate the influences of speed control for a permanent magnet synchronous motor. The improved extended state observer is designed based on a new nonlinear function. This function exhibits better continuity and derivability than previously available functions and can effectively reduce the high-frequency flutter phenomenon. The nonlinear dynamics, model uncertainty, and external disturbances of the permanent magnet synchronous motor speed control system are extended to a new state. The improved extended state observer is utilized to observe this state. The overtime variation of the permanent magnet synchronous motor speed control system can be predicted and compensated in real time by the improved extended state observer. Therefore, the improved extended state observer, which is designed based on the new nonlinear function, can eliminate the disturbances on the permanent magnet synchronous motor speed control system. Finally, simulation experiments are performed and results show that the permanent magnet synchronous motor speed control system with improved extended state observer exhibits better performances.

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