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

In this paper, we propose a triple-stage actuator system with a thermal actuator to increase a servo bandwidth of a head-positioning control system in hard disk drives. The thermal actuator is good for control in high frequency range because it has little negative impact caused by mechanical resonan...

Full description

Saved in:
Bibliographic Details
Published in:IEEE transactions on magnetics 2013-06, Vol.49 (6), p.2738-2743
Main Authors: Atsumi, T., Nakamura, S., Furukawa, M., Naniwa, I., Junguo Xu
Format: Article
Language:English
Subjects:
Actuators
Adaptive control
Bandwidth
Control systems
Cross-disciplinary physics: materials science
rheology
Disk drives
Exact sciences and technology
Frequency response
Hard disks
Magnetism
Materials science
Mathematical model
microactuators
Other topics in materials science
Physics
positioning control
Servomotors
servosystems
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this paper, we propose a triple-stage actuator system with a thermal actuator to increase a servo bandwidth of a head-positioning control system in hard disk drives. The thermal actuator is good for control in high frequency range because it has little negative impact caused by mechanical resonances. Therefore, the proposed system with a thermal actuator can control the head position beyond the major mechanical resonances caused by a voice coil motor (VCM) or piezoelectric (PZT) actuator. As a result, the servo bandwidth of the proposed triple-stage actuator system can be higher than that of the conventional dual-stage actuator system which consists of the VCM and the PZT actuators. Simulation results of sensitivity functions showed that the disturbance-compensation performance below 2 kHz will be improved by 6 dB with proposed control system.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2013.2260136