Seek control system for magnetic disk device

Abstract

Abstract PURPOSE:To reduce the settling time after the end of seek even when the sampling frequency is low by calculating the rate of change of an input signal to an actuator positioning a head depending on the speed deviation and that of preceding and succeeding input signals and limiting the rate of change when the permissible value is exceeded. CONSTITUTION:A signal resulting from the rate of change in the speed deviation limited is obtained at the output of a saturation circuit 20 and the speed deviation is corrected into the limited rate of change in the speed deviation at the point of current sample time by adding the output of the saturation circuit 20 and a speed deviation DELTAvm(k-1) of one preceding sample by an adder 21. The corrected speed deviation is converted into an analog quantity by a D/A converter 22 and subjected to voltage/current conversion with a current amplifier 23, the current drives the actuator 24 to apply the seek control (speed control) of a magnetic head 2. Since the fluctuation of a manipulation variable is controlled, even when the sampling frequency is low, the setting time of seek control is shortened.

Inventors

• 👤 Jun Isozaki
• 👤 磯崎　純
• 👤 Yozo Hibino
• 👤 日比野　陽三
• 👤 Kazuhisa Shishida
• 👤 宍田　和久
• 👤 Yoshiyuki Tate
• 👤 楯　善幸
• 👤 Takashi Yamaguchi
• 👤 高司 山口
• 👤 Marutomo Gotou
• 👤 丸朋 後藤
• 👤 Fukuo Yoneda
• 👤 米田　福男
• 👤 Masahiko Sato
• 👤 雅彦 佐藤
• 👤 Akira Ishibashi
• 👤 石橋　耀

Bibliographic Details