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정동하(Dongha Jung),박노철(No-Chol Park),양현석(Hyunseok Yang),박영필(Young-Pil Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
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.
신호처리용 IC 칩 부착 서스펜션의 열 및 동특성 해석
류인욱(In-Uk Ryu),김동운(Dong- Woon Kim),박노철(No-Chol Park),박영필(Young-Pil Park) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
In order to increase a write frequency in hard disk drive, suspension designers have introduced that the improvement of the write driver and read/write head. Another choice is the selection of the location of the driver IC chip. This paper is about the change of the resonant frequency of the chip-on-suspension both by moving the location and varying the mass. During operation the IC chip generates heat which causes the thermal deformation. Also the effect on variation of the head loading force resulted from the thermal stress and thermal deformation is investigated. The simulation is performed by using Ansys program which can analyze both the temperature distribution and the thermal-stress analysis.