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Title: Self-sensing actuation for nanopositioning and active-mode damping in dual-stage HDDs
Authors: Pang, C.K.
Guo, G.
Chen, B.M. 
Lee, T.H. 
Keywords: Active-mode damping (AMD)
Dual-stage servo systems
Self-sensing actuation (SSA)
Issue Date: 2006
Citation: Pang, C.K., Guo, G., Chen, B.M., Lee, T.H. (2006). Self-sensing actuation for nanopositioning and active-mode damping in dual-stage HDDs. IEEE/ASME Transactions on Mechatronics 11 (3) : 328-338. ScholarBank@NUS Repository.
Abstract: Position sensors other than the R/W heads are not embedded into current hard-disk drives (HDDs) due to cost, resolution, and signal-to-noise ratio (SNR) issues. Moreover, the "optimal" location for placing these sensors is still unknown. In this paper, the Pb-Zr-Ti (PZT) elements in the PZT suspension-based microactuator are used as a secondary actuator and a displacement sensor simultaneously with self-sensing actuation. The proposed displacement estimation circuit produces an estimated PZT microactuator's displacement with high SNR and nanometer resolution comparable to that measured from the laser doppler vibrometer (LDV). A robust active mode damping controller is then designed to damp the PZT microactuator suspension's torsion modes and sway mode, as well as decoupling the HDD dual-stage servo into two distinct loops for individual sensitivity optimization. Our results show attenuation of PZT microactuator's suspension modes by 5 dB and sway mode by 30 dB with low sensitivity. A reduction of up to 20% in 3σ position error signal is also observed. © 2006 IEEE.
Source Title: IEEE/ASME Transactions on Mechatronics
ISSN: 10834435
DOI: 10.1109/TMECH.2006.875560
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