Title :
Lifetime prediction method for piggyback PZT actuator
Author :
Nakamura, Shigeo ; Naniwa, Irizo ; Sato, Kazutaka ; Yasuna, Kei ; Saegusa, Shozo
Author_Institution :
Data Storage & Retrieval Syst. Div., Hitachi Ltd., Kanagawa, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
The experimental lifetime predictive equation for a piggyback PZT actuator was derived. A piggyback actuator is a fine actuator of a dual-stage servo system that is essential to increase the recording density of hard disk drives (HDD´s). The obtained equation agrees with Arrhenius´ equation. The lifetime of our developed actuator was estimated to be longer than 5 years under heavy use conditions. This lifetime prediction method is useful for designing piggyback PZT actuators for high-performance HDD´s
Keywords :
disc drives; fatigue testing; hard discs; lead compounds; life testing; piezoelectric actuators; servomechanisms; PZT; PbZrO3TiO3; dual-stage servo system; fine actuator; hard disk drives; lifetime predictive equation; piggyback PZT actuator; Actuators; Bandwidth; Equations; Hard disks; Magnetic heads; Memory; Prediction methods; Servomechanisms; Suspensions; Voltage;
Journal_Title :
Magnetics, IEEE Transactions on
