303 磁気ディスク装置のヘッド位置決め制御系開発(精密・情報機器の制御I)(OS 精密・情報機器の制御)

概要

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In Hard Disk Drive, a digital control system is usually applied because of the dispersively recorded positioning signal on a disc. Therefore, to improve a head positioning accuracy, it is necessary to make a sampling frequency high in conventional method. However, it is very difficult to increase a sampling frequency, because of the decrease in Hard Disk Drive capacity. So, to solve this problem, the method of improving a head positioning accuracy without making a sampling frequency high is proposed in this paper. In proposed method, a control signal to Voice Coil Motor is changed in sampling period. Furthermore, by setting the changing time allocation and gain of the control signal to the optimum, a phase delay by discretization is recovered and stimulating a resonance mode of Voice Coil Motor over Nyquist frequency is avoided. Proposed method does not require an alteration to hardware at all, and this method is easily applicable to a mass-production only by changing a control program. The validity of the proposed method is confirmed by the numerical and experimental results with a miniature 2.5-inch Hard Disk Drive.
2001-04-20