425 ハードディスクドライブ用二段サーボ方式ヘッドアームの制御

概要

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This paper describes a new type of dual stage servo system for magnetic disk drives. The following and seeking motions of a head are controlled by a voice coil motor (VCM) and four PZT actuators. The four PZT actuators are bonded to the metallic head arm with conductive bond. The VCM is used as an actuator for seeking and the PZT actuators are used for accurate following of the track. The PZT actuators also control some vibration modes of the head arm and the servo system has a bandwidth of over 10kHz. The μ synthesis control theory was used in the design of controllers for vibration control of the arm and the control of the motion to follow the displacement of the disk surface induced by precession during rotation The characteristics of a prototype were measured and the effectiveness of the new type of the servo system was verified by experiment.
一般社団法人日本機械学会の論文
2000-09-01