Dual-stage actuator system for magnetic disk drives using a shear mode piezoelectric microactuator

1999 ◽  
Vol 35 (2) ◽  
pp. 988-992 ◽  
Author(s):  
S. Koganezawa ◽  
Y. Uematsu ◽  
T. Yamada ◽  
H. Nakano ◽  
J. Inoue ◽  
...  
Keyword(s):  
Shear Mode ◽  
Disk Drives ◽  
Magnetic Disk ◽  
Dual Stage ◽  
Actuator System ◽  
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.

Effect of dual-stage actuator on positioning accuracy in 10 k rpm magnetic disk drives

2001 ◽  
Vol 37 (2) ◽  
pp. 955-958 ◽  
Author(s):  
S. Koganezawa ◽  
T. Hara ◽  
Y. Uematsu ◽  
T. Yamada
Keyword(s):  
Disk Drives ◽  
Positioning Accuracy ◽  
Magnetic Disk ◽  
Dual Stage ◽  
Dual Stage Actuator
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