스윙암 타입 광디스크 드라이브의 탐색제어와 추적제어

This paper proposes a new positioning mechanism with a dual parallel type actuator using piezoelectric material for an optical disc drive. A VCM(Voice Coil Motor) works as a coarse motion actuator with a wide range of operation while a piezoelectric actuator achieves fine motion, high precision and high bandwidth tasks. The dynamic model of the proposed dual parallel type actuator consisting of piezoelectric bimorph PZT is derived from Hamilton's principle. A PD controller is designed for seek control of the VCM and a lead-lag controller is designed for tracking control of the piezoelectric actuator and the VCM actuator. A parallel loop control is used for trucking control of the dual actuator composed with the piezoelectric actuator and the VCM. The performance of the proposed system is verified through simulation and experiment.