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Sensors and Materials
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Sensors and Materials, Volume 30, Number 10(1) (2018)
Copyright(C) MYU K.K.
pp. 2183-2197
S&M1668 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2018.1848
Published: October 12, 2018

Performance Evaluation Using Laser Doppler Vibrometer Sensing Technique on Advanced Lead Magnesium Niobate-lead Titanate Piezoelectric-material-based Microactuator for Hard Drive Head [PDF]

Parinya Wattananukulchai and Don Isarakorn

(Received December 15, 2017; Accepted February 13, 2018)

Keywords: PZT, PMN-PT, HDD, HGA, TPI, resonance, stroke, DSA

This paper presents a microactuator for a dual-stage actuator (DSA) of hard disk drive (HDD) based on a lead magnesium niobate-lead titanate (PMN-PT) piezoelectric material and a comparative evaluation of its performance versus that of a traditional lead zirconate titanate (PZT) microactuator using the laser Doppler vibrometer (LDV) sensing technique. PZT microactuator technology has commonly been implemented in the read/write (R/W) magnetic head of HDD. It has a significant function, that is, it moves the magnetic head rapidly and accurately. In order to achieve both accurate positioning control on data tracks and high-speed access across another data track, advanced high-performance actuators and servo control technologies are necessary. An actuator with a wide stroke travel range is essential for HDD as it gives a high-speed access performance. In this study, we focused on comparing the proposed dual-stage PMN-PT head-based actuator with the existing PZT actuator that were mounted on a commercial head gimbal assembly (HGA) using an LDV to determine whether the proposed device could be a worthy replacement of the traditional PZT microactuator. Our experimental results show that the proposed PMN-PT microactuator provided more than twofold improvement in the stroke travel of the R/W magnetic head. Moreover, its dynamic behavior was suitable for assembling a high-density HDD in the future for big data storage without any needs to redesign the HGA nor to costly invest in new assembling machines in a production line. The comparative data of dynamic and static behaviors of PMN-PT versus PZT obtained in this study may be put to good use by sensor designers. Moreover, for many cyber-physical system designers, our data may make them take interest in PMN-PT as a better-performing sensor and an actuator for their systems.

Corresponding author: Don Isarakorn


Cite this article
Parinya Wattananukulchai and Don Isarakorn, Performance Evaluation Using Laser Doppler Vibrometer Sensing Technique on Advanced Lead Magnesium Niobate-lead Titanate Piezoelectric-material-based Microactuator for Hard Drive Head, Sens. Mater., Vol. 30, No. 10, 2018, p. 2183-2197.



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