scholarly journals Multiple robust track-following controller design in hard disk drives

2008 ◽  
Vol 22 (4) ◽  
pp. 359-373 ◽  
Author(s):  
Jongeun Choi ◽  
Ryozo Nagamune ◽  
Roberto Horowitz
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives

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

Sequential vs. Parallel Synthesis for Dual-Stage Hard Disk Drives

2012 ◽  
Author(s):  
Craig E. Stensland ◽  
Mark Bedillion
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Voice Coil Motor ◽  
Hard Disk ◽  
Parallel Synthesis ◽  
Disk Drives ◽  
Parallel Design ◽  
High Bandwidth ◽  
Dual Stage ◽  
Single Input

Modern hard disk drives (HDDs) use single-input, dual-output (SIDO) controllers to control a dual-stage plant consisting of a large-stroke voice coil motor (VCM) and a short-stroke, high-bandwidth piezoelectric microactuator (PZT). Various methods have been proposed to perform the SIDO controller design; among the most commonly used approaches is μ-synthesis. While μ-synthesis generates stable controllers for the overall system, it does not guarantee stability of the VCM-only loop in the presence of microactuator saturation or failure. One approach to the DISO design that maintains VCM-only stability is the sequential design of VCM and PZT controllers. This paper presents a systematic study of sequential vs. parallel design. Designs are evaluated by comparing values of μ obtained for equivalent designs between the sequential and parallel approaches. The circle criterion is used to test stability of the system under saturation. Performance of sequential and parallel designs in shock events are tested in simulation.

Parametric Uncertainty Modeling and Multiple Controller Design for Hard Disk Drives

2010 ◽  
Author(s):  
Ehsan Azadi Yazdi ◽  
Mohammad Sepasi ◽  
Farrokh Sassani ◽  
Ryozo Nagamune
Keyword(s):  
Transfer Function ◽  
Controller Design ◽  
Hard Disk Drives ◽  
Design Procedure ◽  
Parametric Uncertainty ◽  
Uncertainty Modeling ◽  
Hard Disk ◽  
Disk Drives ◽  
Experimental Frequency ◽  
Multiple Controller

This paper proposes a new design procedure for track-following control systems in hard disk drives. The procedure is automated, in the sense that, for given experimental frequency response data of the suspension arm dynamics and a model structure, it automatically derives a transfer function set with uncorrelated parametric uncertainties. Subsequently, for the transfer function set, a given controller structure, and closed-loop performance specifications in the frequency domain, it automatically designs a partition of the uncertainties and corresponding multiple robust controllers. Experiments on actual hard disk drives demonstrate the usefulness and efficiency of the proposed procedure.

scholarly journals Robust Track-Following Controller Design for Hard Disk Drives With Irregular Sampling

2013 ◽  
Vol 49 (6) ◽  
pp. 2798-2804 ◽  
Author(s):  
Behrooz Shahsavari ◽  
Richard Conway ◽  
Ehsan Keikha ◽  
Fu Zhang ◽  
Roberto Horowitz
Keyword(s):  
Controller Design ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Irregular Sampling ◽  
Disk Drives
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