Swing-arm-type PZT dual actuator with fast seeking for optical disk drive |
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Authors: | W-I Cho N-C Park H Yang Y-P Park |
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Affiliation: | (1) Center for Information Storage Device (CISD), Mechanical Engineering, Yonsei University, Shinchon-dong 134, Sudaemoon-ku, Seoul 120-749, Korea e-mail: knight88@cisd.yonsei.ac.kr, KR |
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Abstract: | In this paper, a swing-arm-type dual positioning mechanism using a voice coil motor (VCM) and bimorph PZT actuators is proposed
for the possible application to the future optical disc drive actuator. A VCM is used as a coarse motion actuator, and a set
of piezoelectric actuators is used for fine motion. The two pairs of PZT actuators are arranged in parallel and are carefully
designed to deflect in `S' shape such that tension and compression forces are generated simultaneously and thus the hysteresis
is minimized. The static and dynamic analyses are performed and the parameter studies on the key dimensions of the set of
PZT actuators are investigated. For fast seeking motion, time optimal control scheme combined with PD algorithm is adopted
for the fast seeking motion of VCM. Positive position feedback (PPF) control is used to suppress residual vibration for the
PZT actuator beams by activating it at the end of VCM swing motion. The feasibility of the suggested actuator system and the
control scheme is demonstrated through simulations and experiments.
Received: 5 July 2001/Accepted: 21 December 2001 |
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Keywords: | |
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