Short and long-span track seek control for hard disk drive dual-stage servo actuators

B Hredzak, Guido Herrmann, G Guo

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

9 Citations (Scopus)


A novel strategy for design of a control system for a dual-stage servo actuator used in hard disk drives is proposed. The control system enables track-following, and both short-span and long-span track seeking. For this, a well-known decoupling structure is employed to disconnect the control of the primary voice coil motor (VCM) actuator from the loop for a secondary high-bandwidth actuator. The design procedure can be summarised in four steps: (i) design of an established non-linear seek-settle-track following controller for the VCM, (ii) design of a linear track following controller for the secondary actuator, (iii) observer design and (iv) design of a compensator to retain global stability and to improve performance. The compensator used in the secondary control loop is suitably combined with a saturation non-linearity to obtain actuator signal boundedness for the secondary actuator. The performance and robustness of the proposed control system is analyzed and demonstrated through simulation. Presented results show good track-following/seeking performance with negligible overshoot, fast settling time and smooth transition between short and long-span track seeking.
Translated title of the contributionShort and Long-Span Track Seek Control for Hard Disk Drive Dual-Stage Servo Actuators
Original languageEnglish
Title of host publication31st Annual Conference of IEEE Industrial Electronics Society, 2005. IECON 2005
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages6
ISBN (Print)0780392523
Publication statusPublished - Mar 2006

Bibliographical note

Conference Organiser: IEEE
Other identifier: 10.1109/IECON.2005.1569199


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