Magnetic disk apparatus and method for controlling magnetic...

Details Magnetic disk apparatus and method for controlling magnetic... Magnetic disk apparatus and method for controlling magnetic...

2011-04-19

2011-04-19

Wong, K. (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040, C360S078090

Reexamination Certificate

active

07929242

ABSTRACT:
A magnetic disk apparatus includes: a driving section for moving a magnetic head recoding and reproducing information in a magnetic disk; and a controller for controlling the driving section. The controller includes: a position-error feedback control system having an integrator and a phase lead compensator and obtaining a position command based on difference between target position and detection position of the magnetic head to perform feedback control of the driving section; and a two-freedom-degree control system inputting a target move distance of the magnetic head and outputting a current command to the driving section by using a mathematic model of the driving section. The controller providing the driving section with an output of the integrator and therewith updating the mathematical model by using an output of the phase lead compensator, in each of the times of positioning control and seek of the magnetic head.

REFERENCES:
patent: 7031099 (2006-04-01), Kohso et al.
patent: 7619850 (2009-11-01), Takakura
patent: 7636605 (2009-12-01), Takakura
patent: 2009/0040647 (2009-02-01), Takakura
patent: 09-073618 (1997-03-01), None
Yatsu, et al. Seek Control Method of Hard Disk Drives Using Model Following Control, The 74th JSME Spring Annual Meeting, vol. 4, pp. 410-411, 1997.

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