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Adaptive H-infinity hardware controller for disc drive actuator control

A disk drive, adjuster technology applied to aligning tracks on a disk, driving/moving recording heads, instrumentation, etc., capable of solving unsatisfactory problems, etc.

Inactive Publication Date: 2002-04-10
SEAGATE TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The implementation of servo control electronics provides the necessary control signals to the main and auxiliary motors, however, this technology is not yet satisfactory

Method used

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  • Adaptive H-infinity hardware controller for disc drive actuator control
  • Adaptive H-infinity hardware controller for disc drive actuator control
  • Adaptive H-infinity hardware controller for disc drive actuator control

Examples

Experimental program
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Effect test

Embodiment Construction

[0024] refer to figure 1 , shows a top view of a disk drive 100 for storing computerized data. Disk drive 100 includes a head disk assembly (HDA) 101 within which the various drive mechanics are located. A printed circuit board (PCB, not shown) is placed on the lower side of the HDA 101 to constitute the disk drive 100 together with the PCB support circuit for controlling the operation of the HDA 101 .

[0025] The HAD 101 includes a base 102 and an upper cover 104 (shown in partial cutaway), which together form a working platform enclosure for controlling the internal environment of the disk drive 100 . During operation, a spindle motor 106 rotates a disk stack 107 comprising a plurality of magnetic recording disks 108 axially aligned in an angular direction as indicated by arrow 109 . For reference, disk drive 100 has overall dimensions of approximately 15 centimeters, cm (5.75 feet, in) by 10 cm (4 in) by 2.5 cm (1 in), so as to have what is commonly referred to in the in...

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PUM

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Abstract

Apparatus and method for providing servo control in a disc drive (100). An actuator (110) supports an array of heads adjacent a corresponding array of discs (108). A voice coil motor, VCM (124) provides coarse actuator positional control and a microactuator, MA (125) provides fine positional control. A servo engine 154, characterized as an H-infinity hardware input / output controller, generates control signals Y1(K) and Y2(K) for the respective VCM, MA to cause a selected head to follow a desired track on the corresponding disc surface. The servo engine utilizes coefficients adapted for each head / disc combination, and which are selected by obtaining an output response for each head (216), selecting the coefficients in relation to the output response for each head (218), and storing the coefficients in nonvolatile memory (220). The appropriate coefficients are thereafter loaded into volatile memory (176, 194) of the servo engine as each head is selected in turn (238).

Description

(1) Technical field [0001] The present invention relates to magnetic data storage devices, and in particular, but not limited to, an H-type infinite controller for providing control input to disk drive regulators to maintain heads adjacent selected tracks on rotating disks. (2) Background technology [0002] Disk drives are the primary storage devices in modern computer systems and networks. A typical disk drive includes a head disk assembly (HDA), which houses the mechanical parts of the drive; and a printed circuit board (PCB), which is placed on the outer surface of the HAD and supports the electronic circuitry that controls the HAD. [0003] A typical HAD consists of one or more fixed magnetic storage platters mounted on the rotating journal of a spindle motor to form a rotating disk assembly; The magnetic head array of the track. A modulating motor, such as a voice coil motor, rotates the actuator assembly, thereby moving the head across the disk surface. The control...

Claims

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Application Information

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IPC IPC(8): G11B21/10G11B5/55G11B5/596
CPCG11B5/5552G11B5/596
Inventor T·E·埃尔V·塔恩特拉卡尔
Owner SEAGATE TECH LLC