Track-following control with active vibration damping and compensation of a dual-stage servo system

Authors:
Xinghui Huang;Roberto Horowitz;Yunfeng Li
Affiliations:
Department of Mechanical Engineering, University of California at Berkeley, 94720, Berkeley, CA, USA;Department of Mechanical Engineering, University of California at Berkeley, 94720, Berkeley, CA, USA;Department of Mechanical Engineering, University of California at Berkeley, 94720, Berkeley, CA, USA and Maxtor Corporation, 500 McCarthy Blvd, 95035, Milpitas, CA, USA
Venue:
Microsystem Technologies
Year:
2005

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Abstract

This paper proposes a vibration control scheme for an actuated-slider dual-stage servo system. The control scheme consists of three components: a basic track-following servo loop, a feedback vibration damping loop around the main actuator, the voice coil motor (VCM), and a feedforward vibration compensation loop around the secondary microactuator (MA). A strain gauge sensor fabricated on the surface of the suspension detects airflow-excited structural vibrations and its output is fed to the feedback damping and feedforward compensation loops simultaneously. A higher sampling rate can be utilized for both the feedback damping and feedforward compensation controllers to achieve better performance. Simulation results show that the track-misregistration (TMR) resulting from the airflow-excited structural vibrations can be greatly attenuated, achieving a total reduction in TMR by 27% over the conventional dual-stage actuation without dedicated vibration control. Based on this control scheme and simulation results, projection of the system performance to the target of 500k tracks per inch (TPI) is performed, yielding some guidelines on how to improve disk drive’s operational conditions and control effect in order to approach the targeted areal density, 3σ TMR budget of 5 nm.