JPS6329380A - Magnetic disk device - Google Patents

Magnetic disk device

Info

Publication number
JPS6329380A
JPS6329380A JP61172111A JP17211186A JPS6329380A JP S6329380 A JPS6329380 A JP S6329380A JP 61172111 A JP61172111 A JP 61172111A JP 17211186 A JP17211186 A JP 17211186A JP S6329380 A JPS6329380 A JP S6329380A
Authority
JP
Japan
Prior art keywords
voice coil
current
coil motor
positioner
circuit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP61172111A
Other languages
Japanese (ja)
Inventor
Seiji Takahashi
高橋 精治
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to JP61172111A priority Critical patent/JPS6329380A/en
Publication of JPS6329380A publication Critical patent/JPS6329380A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To attain proper grasp of check period by providing a comparison decision circuit detecting a faulty current in a voice coil motor from the comparison with a current stored in a voice coil motor current storage circuit and giving an output to a control circuit. CONSTITUTION:Just after positioning of a positioner 6, a voice coil motor current detection circuit 4 detects a current of a voice coil motor 7, and a comparison decision circuit 2 decides the presence of a fault of the current of the voice coil motor 7 depending on said current and an output signal of a voice coil motor current storage circuit 5 storing a current before the positioner 6 is positioned and the result is fed to a control circuit 1. If the positioner hold current is changed by a specified value or over before and after the positioner positioning, it is detected by a comparison decision circuit 2, its signal is fed to the control circuit 1, which receives it to inform a fault externally. Thus, mechanical wear of the positioner or the like is detected earlier, the check period of the magnetic disk device is grasped properly to improve the efficiency of maintenance.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、磁気ディスク装置に関し、特にポジショナの
機械的摩耗等を検出することができる磁気ディスク装f
K関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic disk device, and particularly to a magnetic disk device capable of detecting mechanical wear, etc. of a positioner.
Regarding K.

(従来の技術) 従来の磁気ディスク装置は、ポジ7ヨナを高速、かつ安
定に目標のシリンダ上に位置決めするために、ポジショ
ナの走行速度やポジショナが目標のシリンダ上に停止す
る直前の行過ぎ量を規定の範囲内になるよう調整してい
た。
(Prior art) In order to position the positioner 7 positioner on the target cylinder at high speed and stably, the conventional magnetic disk device uses the running speed of the positioner and the amount of overtravel just before the positioner stops on the target cylinder. was adjusted to be within the specified range.

(発明が解決しようとする問題点) 上述した従来の磁気ディスク装置では、ポジショナの走
行が機械的な動作を伴うため、機械部品o摩耗等により
ボジショナの行過ぎ量(オフセット量)が増大し、正規
の位置からのずれが長時間にわたって生じる。
(Problems to be Solved by the Invention) In the above-described conventional magnetic disk device, since the movement of the positioner involves mechanical operation, the amount of overtravel (offset amount) of the positioner increases due to wear of mechanical parts, etc. A deviation from the normal position occurs over a long period of time.

しかし、前述のようなずれが生じても、リードエラーま
たはシークエラーとして表われてくるまで、磁気ディス
ク装置全体としては正常に動作していることになシ、固
定的なエラーが生じるまでリード/ライトしており、リ
ードマージンを極端に悪くするという問題点があった。
However, even if the above-mentioned deviation occurs, the magnetic disk drive as a whole is still operating normally until it appears as a read error or seek error. There was a problem in that the read margin was extremely poor.

本発明の目的は、ポジショナの機械的摩耗等を早期に検
出し、リードマージンの低下を防ぎ、点検時期を適確に
把握できる磁気ディスク装置を提供することにある。
SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic disk device that can detect mechanical wear of a positioner at an early stage, prevent a decrease in read margin, and accurately determine the timing of inspection.

(問題点を解決するための手段) 前記目的を達成するために、本発明による磁気ディスク
装置は、制御回路からの信号によりボジショナ駆動回路
を介してボイスコイルモータでポジショナを駆動する磁
気ディスク装置において、前記ボイスコイルモータの1
直流を検出するボイスコイルモータ電流検出回路と、前
記ボイスコイルモータ電流検出回路からの信号により前
記ポジショナの位置決め前の前記ボイスコイルモータの
電流を記憶するボイスコイルモータ電流記憶回路と、前
記ボイスコイルモータ電流記憶回路に記憶されている電
流と前記ボイスコイルモータ電流検出回路で検出される
前記ポジショナの位置決め後の前記ボイスコイルモータ
の電流とを比較することにより前記ボイスコイルモータ
に流れる電流の異常を検出して前記制御回路に出力する
比較判定回路とから構成されている。
(Means for Solving the Problems) In order to achieve the above object, a magnetic disk device according to the present invention is a magnetic disk device in which a positioner is driven by a voice coil motor via a positioner drive circuit in response to a signal from a control circuit. , one of the voice coil motors
a voice coil motor current detection circuit that detects direct current; a voice coil motor current storage circuit that stores the current of the voice coil motor before positioning the positioner based on a signal from the voice coil motor current detection circuit; Detecting an abnormality in the current flowing through the voice coil motor by comparing the current stored in the current storage circuit and the current of the voice coil motor after positioning the positioner detected by the voice coil motor current detection circuit. and a comparison/judgment circuit that outputs the results to the control circuit.

(実施例) 次に、本発明の実施例について図面を参照して説明する
(Example) Next, an example of the present invention will be described with reference to the drawings.

第1図は、本発明の一実施例を示すブロック図である。FIG. 1 is a block diagram showing one embodiment of the present invention.

第1図に示すように1本発明による磁気ディスク装置は
、制御信号およびデータ信号の授受を行う制御回路1と
、この制御回路】の指令によってボジクヨナ6を目的の
位置に位置決めするポジショナ駆動回路3と、このポジ
ショナ駆動回路3の出力を受けてポジショナ6を駆動す
るボイスコイルモータ7と、ポジショナ位置決め後のボ
・fスコイルモータフの電流を検出するボイスコイルモ
ータ電流検出回路4と、ポジショナ位置決め前のボイス
コイルモータ7の電流を記憶しておくボイスコイルモー
タ電流記憶回路Sと、前記ボイスコイルモータt 置換
出回路4と前記ボイスコイルモ−タ電流記憶回路Sから
の出力信号を受けて、ボイスコイルモータフに流れるポ
ジショナホールド電流の異常の有無を判定して、その結
果を制御回路1に送出する比較判定回路2とを備えて構
成されている。
As shown in FIG. 1, a magnetic disk drive according to the present invention includes a control circuit 1 for transmitting and receiving control signals and data signals, and a positioner drive circuit 3 for positioning a positioner 6 at a target position according to commands from the control circuit. , a voice coil motor 7 that receives the output of the positioner drive circuit 3 and drives the positioner 6, a voice coil motor current detection circuit 4 that detects the current of the voice coil motor after positioning the positioner, and a voice coil motor current detection circuit 4 that detects the current of the voice coil motor after positioning the positioner. A voice coil motor current memory circuit S for storing the current of the coil motor 7, the voice coil motor t replacement output circuit 4, and the voice coil motor current memory circuit S receive output signals from the voice coil motor current memory circuit S and the voice coil motor current memory circuit S stores the current of the coil motor 7. It is configured to include a comparison and determination circuit 2 that determines whether or not there is an abnormality in the flowing positioner hold current and sends the result to the control circuit 1.

上記構成を有する磁気ディスク装置は、制御回路1の指
令により、ポジショナ、駆動回路3によってボイスコイ
ルモータ7を駆動させ、磁気ヘッド8を搭載したポジシ
ョナ6を目的の位置に位置決めする。
The magnetic disk drive having the above configuration causes the positioner and drive circuit 3 to drive the voice coil motor 7 in response to commands from the control circuit 1, and positions the positioner 6 on which the magnetic head 8 is mounted at a target position.

ポジショナ6を目的の位置に位置決めした直後にボイス
コイルモータ電流検出回路4によってボイスフィルモー
タフの電流を検出し、この電流とポジショナ6を位置決
めする前の電流を記憶しているボイスコイルモータ電流
記憶回路5の出力信号により、ポジショナホールド’F
!tIkの異常の有無を判定する比較判定回路2によっ
てボイスコイルモータ7の電流の異常の有無を判定し、
その結果を制御回路1に送出する。
Immediately after positioning the positioner 6 at the target position, the voice coil motor current detection circuit 4 detects the current of the voice fill motor, and this current and the current before positioning the positioner 6 are stored in a voice coil motor current memory. Positioner hold 'F' is activated by the output signal of circuit 5.
! A comparison and determination circuit 2 that determines whether there is an abnormality in tIk determines whether or not there is an abnormality in the current of the voice coil motor 7,
The result is sent to the control circuit 1.

もし、ポジショナ6のグリースの劣化もしくはベアリン
グの摩耗等によって、ボイスコイルモータフに流れる電
流が変化した場合、つま)、ポジショナ位置決め前と彼
でポジショナホールド電流が規定値以上に変化した場合
には、それが比較判定回路2によって検出され、その信
号が制御回路】に送られるので、制御回路1はこれを受
けて異常を外部に知らせる。
If the current flowing to the voice coil motor changes due to deterioration of the grease in the positioner 6 or wear of the bearings, etc., or if the positioner hold current changes beyond the specified value before positioning the positioner, This is detected by the comparison/judgment circuit 2, and the signal is sent to the control circuit.The control circuit 1 receives this and notifies the outside of the abnormality.

すなわち、本発明の磁気ディスク装置は、ポジショナ6
の機械部品の摩耗等によってポジショナ6の行過ぎ量(
オフセット量)が増大し、正規の位置からのずれが生じ
、リードマージンを悪化することを防ぎ、磁気ディスク
装置の点検時期を適確に把握し、保守作業の効率を向上
させることができる。
That is, the magnetic disk device of the present invention has the positioner 6
The amount of overtravel of the positioner 6 (
It is possible to prevent an increase in the amount of offset (amount of offset) from the normal position and a deterioration of the read margin, and to accurately determine when to inspect the magnetic disk device, thereby improving the efficiency of maintenance work.

(発明の効果) 以上説明したようK、本発明の磁気ディスク装置を用い
ることにより、ポジショナの機械的摩耗等を早期に検出
し、リードマージンの低下を防ぎ、磁気ディスク装置の
点検時期を適確に把握し、保守作業の効率を向上させる
ことができるという効果がある。
(Effects of the Invention) As explained above, by using the magnetic disk drive of the present invention, mechanical wear of the positioner, etc. can be detected early, the read margin can be prevented from decreasing, and the inspection timing of the magnetic disk drive can be determined appropriately. This has the effect of improving the efficiency of maintenance work.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は、本発明の一実施例を示すブロック図である。 1・・・制御回路 2・・・比較判定回路 3−φ・ポジショナ駆動回路 4・・・ボイスコイルモータ電流検出回路S・・・ボイ
スコイルモータ電流記憶回路S−・・ポジショナ 71・ボイスコイルモータ 8・・・磁気ヘッド 特許出題人 日本電気株式会社
FIG. 1 is a block diagram showing one embodiment of the present invention. 1...Control circuit 2...Comparison/judgment circuit 3-φ/Positioner drive circuit 4...Voice coil motor current detection circuit S...Voice coil motor current storage circuit S-...Positioner 71/Voice coil motor 8...Magnetic head patent questioner NEC Corporation

Claims (1)

【特許請求の範囲】[Claims] 制御回路からの信号によりポジシヨナ駆動回路を介して
ボイスコイルモータでポジシヨナを駆動する磁気ディス
ク装置において、前記ボイスコイルモータの電流を検出
するボイスコイルモータ電流検出回路と、前記ボイスコ
イルモータ電流検出回路からの信号により前記ポジシヨ
ナの位置決め前の前記ボイスコイルモータの電流を記憶
するボイスコイルモータ電流記憶回路と、前記ボイスコ
イルモータ電流記憶回路に記憶されている電流と前記ボ
イスコイルモータ電流検出回路で検出される前記ポジシ
ヨナの位置決め後の前記ボイスコイルモータの電流とを
比較することにより前記ボイスコイルモータに流れる電
流の異常を検出して前記制御回路に出力する比較判定回
路とから構成したことを特徴とする磁気ディスク装置。
In a magnetic disk drive in which a positioner is driven by a voice coil motor via a positioner drive circuit in response to a signal from a control circuit, a voice coil motor current detection circuit detects a current of the voice coil motor; A voice coil motor current storage circuit stores the current of the voice coil motor before positioning the positioner based on the signal, and the current stored in the voice coil motor current storage circuit is detected by the voice coil motor current detection circuit. and a comparison/judgment circuit that detects an abnormality in the current flowing through the voice coil motor by comparing the current of the voice coil motor after the positioner is positioned, and outputs the detected abnormality to the control circuit. Magnetic disk device.
JP61172111A 1986-07-22 1986-07-22 Magnetic disk device Pending JPS6329380A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61172111A JPS6329380A (en) 1986-07-22 1986-07-22 Magnetic disk device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61172111A JPS6329380A (en) 1986-07-22 1986-07-22 Magnetic disk device

Publications (1)

Publication Number Publication Date
JPS6329380A true JPS6329380A (en) 1988-02-08

Family

ID=15935757

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61172111A Pending JPS6329380A (en) 1986-07-22 1986-07-22 Magnetic disk device

Country Status (1)

Country Link
JP (1) JPS6329380A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699917A3 (en) * 1994-09-01 1997-05-07 Read Rite Corp A system for testing the voice coil element of a disk drive rotary actuator
US5808975A (en) * 1996-08-19 1998-09-15 Fujitsu Limited Optical storage apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0699917A3 (en) * 1994-09-01 1997-05-07 Read Rite Corp A system for testing the voice coil element of a disk drive rotary actuator
US5808975A (en) * 1996-08-19 1998-09-15 Fujitsu Limited Optical storage apparatus

Similar Documents

Publication Publication Date Title
US5723858A (en) Position encoder with fault indicator
JPH09329009A (en) Control system of multi-degree-of-freedom valve system
JPS6329380A (en) Magnetic disk device
US5617339A (en) Method and apparatus for detecting degradation in data storage system spindle motor performance
JPH0814950B2 (en) Head positioning method for magnetic disk drive
JPH09245419A (en) Magnetic disk apparatus
US5148415A (en) Magneto-optical disc apparatus having head-disc distance control
JPS63127460A (en) Magnetic disk device
JPS63160002A (en) System for impressing external magnetic field to magneto-optical disk device
KR100257776B1 (en) Sensorless motor driver
JPH01138470A (en) Inspection system for magnetic disk device
JPH05303851A (en) Disk-shaped recording carrier scanning device
JPS6233375A (en) Carrying control device for recording disk signal detecting means
JP2780442B2 (en) Stepping motor drive for head
JPH06119730A (en) Magnetic disk device
JPH08308276A (en) Rotation stop controller for motor
JP2740953B2 (en) Spindle fixed position stop control device
JPS6247884A (en) Detecting system for servo information
JPS6226677A (en) Disk storage device
JPS61216154A (en) Control mechanism for cartridge handling
JPS613379A (en) Magnetic disk device
JPS62202367A (en) Magnetic disk device
JPH03290880A (en) Control system for magnetic disk device
JPH07301655A (en) Disconnection diagnostic device for duty control solenoid
JPH02246059A (en) Initial seek system