Iterative Feedback Tuning (IFT) of Head Positioning Servomechanism in Hard Disk Drive

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International Journal on Smart Sensing and Intelligent Systems

Professor Subhas Chandra Mukhopadhyay

Exeley Inc. (New York)

Subject: Computational Science & Engineering, Engineering, Electrical & Electronic

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VOLUME 1 , ISSUE 1 (March 2008) > List of articles

Iterative Feedback Tuning (IFT) of Head Positioning Servomechanism in Hard Disk Drive

A. Al Mamun * / K.C. Tan * / W.E. Wong *

Keywords : HDD Servomechanism, Iterative Feedback Tuning, PID controller, Voice Coil Motor

Citation Information : International Journal on Smart Sensing and Intelligent Systems. Volume 1, Issue 1, Pages 1-16, DOI: https://doi.org/10.21307/ijssis-2017-290

License : (CC BY-NC-ND 4.0)

Published Online: 13-December-2017

ARTICLE

ABSTRACT

Actuators used in hard disk drives (HDD) are produced en mass and therefore their dynamic properties vary within a given tolerance bound. A nominal model representing the batch of actuators is used to design the head positioning servomechanism. Equal performance can not be expected for all actuators when such controller is used. Disk drive servomechanism is expected to provide performance with increasingly tighter tolerance as the demand for higher storage capacity continues. Moreover, physical properties of any actuator may change over time causing the degradation of performance. All these issues demand for good on-line tuning of controller. This paper explores the usage of Iterative Feedback Tuning (IFT) in HDD servomechanism. Improved performance of the tuned controller is demonstrated using simulation and experimental results.

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REFERENCES

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