Affiliations: [a] Graduate School of Engineering, Gifu University, 1-1
Yanagido, Gifu, Gifu, 501-1193, Japan. Tel.: +81 58 293 2542; Fax: +81 58 230
1892; E-mail: [email protected]
| [b] Department of Human and Infomation Systems
Engineering, Gifu University, 1-1 Yanagido, Gifu, Gifu, 501-1193, Japan.
Tel.: +81 58 293 2541; Fax: +81 58 230 1892; E-mail:
[email protected]
| [c] Department of Mechanical Engineering, Kangwon National
University, 192-1 Hyoja2dong, Chunchon, Kangwon-Do, 200-701, Korea. Tel.: +82
33 250 6376; Fax: +82 033 257 4190; E-mail: [email protected]
Abstract: This paper describes vibration control and position control of a
micro-actuator for hard disk drives using self-sensing actuator. A stabilizing
feedback control low is designed by using Lyapunov's direct method. The
feedback control law depends only on the time derivative of tip slope in the
micro-actuator. The self-sensing actuation using the electrical RC bridge
circuit can measure strain rate in the micro-actuator. This sensing signals
correspond to the time rate of tip slope in the micro-actuator. The feedback
controller derived from Lyapunov's direct method can realize by using the
self-sensing signal. A two-degree-of-freedom control system consists of a
feedforward and the feedback controller. The feedforward controller is designed
by using inverse dynamic system, while the stabilized feedback controller is
designed by Lyapunov's direct method. Numerical simulation and experimental
results confirm the feasibility of the proposed control system.
Keywords: Micro-actuator, self-sensing actuator, two-degree-of-freedom control, Lyapunov's direct method
