A Data-based Controller Design and Analysis Method for External Disturbances in Head Positioning Systems of Hard Disk Drives

2017 ◽  
Vol 2017 (0) ◽  
pp. C-02
Author(s):  
Shota Yabui
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Analysis Method ◽  
External Disturbances ◽  
Positioning Systems ◽  
Head Positioning

Event-triggered optimal reset control of hard disk drive head-positioning servo systems

2018 ◽  
Vol 233 (5) ◽  
pp. 582-590 ◽  
Author(s):  
Haoping Wang ◽  
Feinan Zhu ◽  
Yang Tian
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drive ◽  
Linear Matrix ◽  
Disk Drives ◽  
Servo Systems ◽  
Positioning Systems ◽  
Head Positioning ◽  
Reset Control ◽  
Event Triggered

This article proposes a state-feedback-based optimal law with reset control for two typical kinds of head-positioning systems with nonlinearities of hard disk drives which combine the improved event-triggering reset condition and an optimal reset law design problem. First, a reset control law is proposed to reset the state of the system at the instants or some reset surfaces which have been proved can overcome the linear limitations. The reset surface is considered as a function of event or it can be defined as an event-triggered system, in which some states of the controller are subjected to impulsive actions. Second, a model predictive optimal law is proposed to the design of the after-reset value which was finally calculated through series linear matrix inequalities. Finally, in comparison with recent linear or nonlinear control methods applied to hard disk drives, our proposed approach shows the simplicity in design process and the robustness to nonlinear uncertainties in plant.

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.

Robust time optimal controller design for hard disk drives

1999 ◽  
Vol 35 (5) ◽  
pp. 3598-3600 ◽  
Author(s):  
Bong Keun Kim ◽  
Wan Kyun Chung ◽  
Ho Seong Lee ◽  
Hyun-Taek Choi ◽  
Il Hong Suh ◽  
...  
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Optimal Controller ◽  
Disk Drives ◽  
Time Optimal

Triple-Stage-Actuator System of Head-Positioning Control in Hard Disk Drives

2013 ◽  
Vol 49 (6) ◽  
pp. 2738-2743 ◽  
Author(s):  
Takenori Atsumi ◽  
Shigeo Nakamura ◽  
Masaru Furukawa ◽  
Irizo Naniwa ◽  
Junguo Xu
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Positioning Control ◽  
Head Positioning ◽  
Actuator System
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