Abstract
In modern times, the design and optimization of different actuator systems for controlling a high-precision position control system represent a popular interdisciplinary research area. Initially, only single-stage actuator systems were used to control most of the motion control applications. Currently, dual-stage actuation systems are widely applied to high-precision position control systems such as hard disk drive (HDD) servo systems. In the dual-stage system, a voice coil motor (VCM) actuator is used as the primary stage and a piezoelectric micro-actuator is applied as the secondary stage. However, a dual-stage control architecture does not show significant performance improvements to achieve the next-generation high-capacity HDD servo system. Research continues on how to fabricate a tertiary actuator for a triple-stage HDD servo system. A thermal positioning controller (TPC) actuator is considered promising as the tertiary stage. The triple-stage system aims to achieve greater bandwidth, track density, and disk speed, with minimum sensitivity and greater error minimization. In this work, these three actuation systems with different combinations of proportional plus integral (PI), proportional plus derivative (PD), and proportional plus integral plus derivative (PID) controller, lag-lead controller, lag filter, and inverse lead plus a PI controller were designed and analyzed through simulation to achieve high-precision positioning. The comparative analyses were done on the MATLAB/Simulink simulation platform.
Highlights
High precision is an essential part of every positioning control system
In the dual-stage hard disk drive (HDD) servo system, voice coil motor (VCM) was used as the primary and PZT was used as the secondary actuator
From the different combinations of plus is derivative (PID) controller, the system gives the optimized performance when the plus derivative (PD) controller was used as the secondary controller
Summary
High precision is an essential part of every positioning control system. To achieve this goal, different actuator stages can be applied to enhance the performances. A hard disk drive (HDD) is a magnetic storage device used to record and retrieve digital information. It is the most important medium for data storage in computers and in data processing systems, where a high-precision control system is a must. The storage capacity of the HDD servo system has been increased tremendously, being almost eight times more than the previous capacity [1], and it will increase in the near future. Dual-stage actuator systems of HDDs available on the market have a maximum capacity of 10 TB. Many scientists and researchers have already started to propose a modern
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