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Method and apparatus for head positioning control in a disk drive

A technology for disk drives, positioning control, applied in motor generator control, aligning tracks on disks, driving/moving recording heads, etc., to solve problems such as differences in actuators

Inactive Publication Date: 2005-02-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method requires a large-capacity memory that stores table information or a complicated operation to obtain table information
Furthermore, even identical actuation devices can exhibit differences in
Fixed table information can't handle this situation, which is disadvantageous

Method used

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  • Method and apparatus for head positioning control in a disk drive
  • Method and apparatus for head positioning control in a disk drive
  • Method and apparatus for head positioning control in a disk drive

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Experimental program
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Embodiment Construction

[0022] Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a conceptual configuration of a head positioning control system according to the present embodiment. figure 2 is a block diagram showing essential components of the magnetic disk drive according to this embodiment.

[0023] (disk drive configuration)

[0024] The magnetic disk drive has a magnetic disk 1, which is a magnetic recording medium, and a magnetic head (hereinafter simply referred to as "head") that performs data reading or writing operations on the magnetic disk 1, such as figure 2 shown. The magnetic disk 1 is rotated by a spindle motor (SPM) 3 .

[0025] The magnetic head 2 is mounted on an actuator 4 including a voice coil motor (VCM) 5 . The VCM driver 60 included in the motor driver IC 6 supplies drive current to the VCM 5 . The motor driver IC 6 includes an SPM driver 61 and a VCM driver 60 and is controlled by the CPU 10 ....

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PUM

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Abstract

A head positioning control system applied to a disk drive is disclosed. The head positioning control system includes a combination of a feedback control unit and a feedforward control unit. During a maximum seek operation, the system uses a saturated value estimating unit to estimate a saturated value for an actuator. The system then sets the saturated value in a variable limiter of the feedforward control unit.

Description

technical field [0001] Generally, the present invention relates to a magnetic disk drive and, more particularly, to head positioning control including a combination of feedback control and feedforward control. Background technique [0002] Generally, a head positioning control system is included in a magnetic disk drive typified by a hard disk drive. The head positioning control system controls an actuator including a voice coil motor (VCM) to position a head on a magnetic disk medium (hereinafter simply referred to as a magnetic disk). [0003] Due to its structure and the like, a motor such as a VCM of an actuator cannot output torque of infinite magnitude. That is, the actuator device (VCM in a narrow sense), the control object (device) of the head positioning control system has limitation (saturation) in its output. [0004] In a conventional system, the saturation value of a control object is considered to be fixed, and a limiter using the fixed saturation value is in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B21/08G11B5/55G11B5/58G11B5/596G11B7/00
CPCG11B5/5547G11B5/59605
Inventor 竹内谦司
Owner KK TOSHIBA