An electrostatic micro actuator for a magnetic head tracking system of hard disk drives

2002 ◽  
Author(s):  
S. Nakamura ◽  
K. Suzuki ◽  
M. Ataka ◽  
H. Fujita
Keyword(s):  
Tracking System ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Head Tracking ◽  
Disk Drives ◽  
Magnetic Head ◽  
Micro Actuator

An electrostatic microactuator using LIGA process for a magnetic head tracking system of hard disk drives

1998 ◽  
Vol 5 (2) ◽  
pp. 69-71 ◽  
Author(s):  
S. Nakamura ◽  
K. Suzuki ◽  
M. Ataka ◽  
H. Fujita ◽  
S. Basrour ◽  
...  
Keyword(s):  
Tracking System ◽  
Hard Disk Drives ◽  
Hard Disk ◽  
Head Tracking ◽  
Disk Drives ◽  
Magnetic Head

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.

Suppression of cross-track vibrations using a self-sensing micro-actuator in hard disk drives

2012 ◽  
Vol 18 (9-10) ◽  
pp. 1309-1317 ◽  
Author(s):  
Uwe Boettcher ◽  
Liane Matthes ◽  
Bernhard Knigge ◽  
Raymond A. de Callafon ◽  
Frank E. Talke
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Micro Actuator ◽  
Cross Track

Stochastic Evaluation of Magnetic Head Wears in Hard Disk Drives

2014 ◽  
Vol 50 (5) ◽  
pp. 1-7 ◽  
Author(s):  
Yu Wang ◽  
Zhi-Sheng Ye ◽  
Kwok-Leung Tsui
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Magnetic Head

scholarly journals Improved design of polymeric composite electrothermal micro-actuator for high track density hard disk drives

2013 ◽  
Vol 19 (9-10) ◽  
pp. 1697-1704 ◽  
Author(s):  
J. P. Yang ◽  
G. K. Lau ◽  
C. P. Tan ◽  
N. B. Chong ◽  
B. Thubthimthong ◽  
...  
Keyword(s):  
Hard Disk Drives ◽  
Polymeric Composite ◽  
Hard Disk ◽  
Track Density ◽  
Disk Drives ◽  
Micro Actuator ◽  
Improved Design ◽  
High Track

Vibro-loading of magnetic head assemblies for hard disk drives

1994 ◽  
Vol 30 (6) ◽  
pp. 4161-4163 ◽  
Author(s):  
K. Aruga ◽  
S. Yoneoka ◽  
T. Ohwe
Keyword(s):  
Hard Disk Drives ◽  
Hard Disk ◽  
Disk Drives ◽  
Magnetic Head
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