Unknown disturbance estimation by sliding mode observer and compensation control for a dual-stage actuator system

2010 ◽  
Vol 43 (18) ◽  
pp. 55-62
Author(s):  
Yoshihito Kinoshita ◽  
Yuichi Chida ◽  
Yuichi Ikeda ◽  
Syota Ohyachi
Keyword(s):  
Sliding Mode ◽  
Sliding Mode Observer ◽  
Disturbance Estimation ◽  
Compensation Control ◽  
Dual Stage ◽  
Actuator System ◽  
Unknown Disturbance ◽  
Dual Stage Actuator

scholarly journals Unknown Disturbance Estimation for a PMSM with a Hybrid Sliding Mode Observer

2015 ◽  
Vol 2015 ◽  
pp. 1-7
Author(s):  
Gang Chen ◽  
Yong Zhou ◽  
TingTing Gao ◽  
Qicai Zhou
Keyword(s):  
Permanent Magnet ◽  
Digital Filter ◽  
Sliding Mode ◽  
Permanent Magnet Synchronous Motor ◽  
High Gain ◽  
Sliding Mode Observer ◽  
Time Varying ◽  
Disturbance Estimation ◽  
Simulation Results ◽  
Unknown Disturbance

A hybrid sliding mode observer that combines high gain feedback and a high-order sliding mode term is developed to identify the time-varying disturbance for a permanent-magnet synchronous motor (PMSM). Based on the measurable current and the position, the unknown disturbance can be identified from the sliding mode term without digital filter effect. It is then used to enhance the robustness of the speed control dynamics. For ease of implementation in real applications, such as DSP and FPGA, the proposed observer is properly designed to avoid complex mathematical operators. Simulation results are given to illustrate the performance of the proposed observer.

Sliding Mode and PID Control of a Dual Stage Actuator for Precision Positioning

2014 ◽  
Vol 47 (3) ◽  
pp. 6550-6555 ◽  
Author(s):  
Shingo Ito ◽  
Juergen Steininger ◽  
Georg Schitter
Keyword(s):  
Pid Control ◽  
Sliding Mode ◽  
Precision Positioning ◽  
Dual Stage ◽  
Dual Stage Actuator

High-bandwidth controller design for dual-stage actuator system in hard disk drives

2022 ◽  
pp. 107754632110623
Author(s):  
Shota Yabui ◽  
Takenori Atsumi
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Voice Coil Motor ◽  
Hard Disk ◽  
Disk Drives ◽  
Positioning Accuracy ◽  
Micro Actuator ◽  
Dual Stage ◽  
Actuator System ◽  
Dual Stage Actuator

Large-capacity hard disk drives are important for the development of an information society. The capacities of hard disk drives depend on the positioning accuracy of magnetic heads, which read and write digital data, in disk-positioning control systems. Therefore, it is necessary to improve positioning accuracy to develop hard disk drives with large capacities. Hard disk drives employ dual-stage actuator systems to accurately control the magnetic heads. A dual-stage actuator system consists of a voice coil motor and micro-actuator. In micro-actuators, there is a trade-off between head-positioning accuracy and stroke limitation. In particular, in a conventional controller design, the micro-actuator is required to actuate such that it compensates for low-frequency vibration. To overcome this trade-off, this study proposes a high-bandwidth controller design for the micro-actuator in a dual-stage actuator system. The proposed method can reduce the required stroke of the micro-actuator by increasing the gain of the feedback controller of the voice coil motor at low frequencies. Although the voice coil motor control loop becomes unstable, the micro-actuator stabilizes the entire feedback loop at high frequencies. As a result, the control system improves the positioning accuracy compared to that achieved by conventional control methods, and the required micro-actuator stroke is reduced.

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