Magnetic disk apparatus and magnetic head control method

Details Magnetic disk apparatus and magnetic head control method Magnetic disk apparatus and magnetic head control method

2008-03-20

2009-11-17

Sniezek, Andrew L (Department: 2627)

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

C360S078040

Reexamination Certificate

active

07619850

ABSTRACT:
A magnetic disk apparatus includes: a driving unit; and control part configured to control the driving unit. The control part includes: a position error feedback control system and a two-degree-of-freedom control system. The position error feedback control system has an integrator and a phase-lead compensator and is operative to determine a position command based on a target position and a sensed position of the magnetic head, thereby performs feedback control on the driving unit. The two-degree-of-freedom control system receives as input a target moving distance of the magnetic head and outputs a current command to the driving unit by using a mathematical model of the driving unit. The control part updates the mathematical model, and has a first update mode in which the mathematical model is updated using the output of the phase-lead compensator while the output of the integrator is provided to the driving unit.

REFERENCES:
patent: 6347018 (2002-02-01), Kadlec et al.
patent: 7394613 (2008-07-01), Takaishi
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 No. 4, pp. 410-411, 1997.

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