Rejecting high frequency disturbances with disturbance observer and phase stabilized control

High-Order Mismatched Disturbance Compensation for Motion Control Systems Via a Continuous Dynamic Sliding-Mode Approach

“…For example, see robot manipulator [2], [3], magnetic balance beam [4], MAGnetic LEViation (MAGLEV) suspension vehicle [5], [6], permanent magnet synchronous motor (PMSM) [7], [8], harddisk drive [9]. Due to the growing interest in smart and high-precision motion devices, the development of disturbance rejection technique has received more and more attentions in motion controller design.…”

“…As a practical alternative approach, disturbance observer based control (DOBC) has been proved to be effective in compensating the effects of unknown external disturbances and model uncertainties in motion control systems [2], [7], [9], [23]. The major merit of the DOBC is that the robustness of the closed-loop system is obtained without sacrificing its nominal control performance [19], [20].…”

Reducing the Peaking Phenomenon in Luenberger Observers in Presence of Quasi-Static Disturbances for Linear Time Invariant Systems

“…In [3] a cascade Kalman Filter is proposed as an observer to estimate the state in sensorless control for an actuator. Other studies as in [4] and in [5] consider extended observers to estimate state variables and disturbances in real applications. In this sense, observers are widely used in many applications to save sensors and also to filter data.…”

Rejecting multi-stage and low-frequency resonance with disturbance observer and feedforward control for engine servo

“…There are considerable number of existing literature using disturbance observer to reject high frequency disturbances in the field of disk drives tracking and positioning control [1,2]. A disturbance observer without using additional sensors to attenuate the effects of disturbances in the low frequency range from 10 Hz up to 500 Hz is designed in [3].…”