JPH0193644A - Viscosity damper device - Google Patents

Viscosity damper device

Info

Publication number
JPH0193644A
JPH0193644A JP24845787A JP24845787A JPH0193644A JP H0193644 A JPH0193644 A JP H0193644A JP 24845787 A JP24845787 A JP 24845787A JP 24845787 A JP24845787 A JP 24845787A JP H0193644 A JPH0193644 A JP H0193644A
Authority
JP
Japan
Prior art keywords
magnetic
viscosity
magnetic fluid
step motor
electromagnet
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
JP24845787A
Other languages
Japanese (ja)
Inventor
Koji Soda
曽田　孝治
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP24845787A priority Critical patent/JPH0193644A/en
Publication of JPH0193644A publication Critical patent/JPH0193644A/en
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/32—Details
    • F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
    • F16F9/535—Magnetorheological [MR] fluid dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/16—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material
    • F16F15/167—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material having an inertia member, e.g. ring
    • F16F15/173—Suppression of vibrations in rotating systems by making use of members moving with the system using a fluid or pasty material having an inertia member, e.g. ring provided within a closed housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/10—Suppression of vibrations in rotating systems by making use of members moving with the system
    • F16F15/18—Suppression of vibrations in rotating systems by making use of members moving with the system using electric, magnetic or electromagnetic means

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Electromagnetism (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

PURPOSE:To make braking possible only when a rotary shaft is going to stop and when it is stopping by constituting a device so as to act braking in cooperation of magnetic fluid's viscosity increased by magnetic force on an electromagnetic with an inertia body. CONSTITUTION:A damper case 6, an inertia body 4 like a circular ring in shape, magnetic fluid 10 and an electromagnet 8 are provided, and they are constituted in such way that braking on the damper case 6, still more on a shaft, can be acted in working of the inertia body 4 together with magnetic fluid's 10 viscosity increased by magnetic force on the electromagnet 8. As a result, if this viscosity damper device is used, for instance, for a step motor 1 for driving a magnetic head, it is possible that moving time of magnetic head is made short through weak generation of braking force in working of the viscosity together with the inertia body 4 while keeping magnetic fluid 10 in low viscosity without supplying magnetic force to the same by de-energizing the electromagnet 8, in a case of acceleration. When it is going to be stopped, stopping time can be shortened while making braking force strong through increasing viscosity of magnetic fluid 10 by magnetic force of the energized electromagnet 8.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は粘性ダンパー装置に関し、さらに詳し・くはス
テップモータ等の軸に取付けられる粘性ダンパー装置に
関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a viscous damper device, and more particularly to a viscous damper device that is attached to a shaft of a step motor or the like.

〔従来の技術〕[Conventional technology]

第３図及び第４図ｄ、例えば実公昭６１−３３３１４号
公報に示された従来の粘性ダンパーが取付けられ几ステ
ップモータの構成図、及び粘性ダンパーの正面図（第４
図Ａ）と断面図Ｃ第４図Ｂ）である。図にＪＰ％Ａて、
（１）はステップモータ、（２）はステップモータの回
転軸の出力側で、プーリー又はギヤ等を設けることによ
ってベルト又はギヤを介し負荷に動力を伝達する。１３
）は粘性ダンパーで第４回出）に断面で示すように鉛ま
たは鋼等を材質とする慣性体（４）と、シリコンオイル
を用いた粘性体（５）と、慣性体（４）と粘性体（５）
を気密性を保って収納するポリカーボネイト等軽い材質
より成るダンパーケース（６）とにより構成され、ステ
ップモータ１１）の回転軸に装着されている。Figures 3 and 4 d are a block diagram of a step motor equipped with a conventional viscous damper as shown in, for example, Japanese Utility Model Publication No. 61-33314, and a front view of the viscous damper (Figure 4).
Figure A) and cross-sectional view C and Figure 4B). In the figure, JP%A,
(1) is a step motor, and (2) is the output side of the rotating shaft of the step motor, and by providing a pulley or gear, power is transmitted to the load via a belt or gear. 13
) is a viscous damper.As shown in the cross section in Part 4), there is an inertial body (4) made of lead or steel, a viscous body (5) made of silicone oil, and an inertial body (4) and a viscous damper. body (5)
The damper case (6) is made of a light material such as polycarbonate, and is mounted on the rotating shaft of the step motor 11).

第５図はステップモータ（１）で負荷（図示せず）を角
変位量の小さい駆動を行つ次時のイナーシャ（ＩＮＥＲ
ＴＩＡ）の減衰の一例を示す図で％（１１）は粘性ダン
パー　ｔａ）　ｋ使用しない場合、（ロ）は粘性ダンパ
ーｔ１１！用し几場合の上記イナーシャの減衰曲線であ
る。即ちステップモータ（１）　ｔｒｉ文献「ステッピ
ング・モータの基礎と応用」Ｃ見城、新村著）の第３章
４．３項に説明されているように一般にイナーシャの減
衰が悪く、粘性ダンパー（３）ラステンプモータの回転
軸に装着しない場合は第５図の０１に示すような減衰曲
線となる。又、粘性ダンパー（３）全ステップモータ（
１）に装着した場合ｒｉ、ステップモータロ）の回転軸
の回転時間が短いとダンパーケース（６）は共動して動
くが慣性体（４）はほとんど動かないので、ステップモ
ータ（１）の回転軸の回転停止時には、慣性体（４）と
慣性体（４）ヲ取り囲む粘性体１５）の粘性との協動に
よりダンパーケース（６）ひいては、ステップモータ（
１）の回転軸に制動がかかシ、Ｑ諺のようなイナーシャ
の減衰曲線となる。Figure 5 shows the inertia (INER) when the step motor (1) drives a load (not shown) with a small angular displacement.
In the figure showing an example of damping of TIA), % (11) is the viscous damper ta) k When not used, (b) is the viscous damper t11! This is the attenuation curve of the above inertia when used. In other words, step motors (1) As explained in Chapter 3, Section 4.3 of the TRI document "Basics and Applications of Stepping Motors" (written by C. Kenshiro and Niimura), inertia damping is generally poor, and viscous dampers (3 ) If it is not attached to the rotating shaft of the last temp motor, the attenuation curve will be as shown at 01 in FIG. In addition, viscous damper (3) all step motors (
If the rotation time of the rotating shaft of the step motor (1) is short, the damper case (6) will move together, but the inertial body (4) will hardly move, so the step motor (1) will When the rotating shaft stops rotating, the damper case (6) and the step motor (
1) Braking is applied to the rotation axis, resulting in an inertia decay curve similar to the Q proverb.

即ち、ステップモータ（１）の回転軸の所定位置への停
止時間は粘性ダンパー（３）を用いた方が短い。That is, the stopping time of the rotating shaft of the step motor (1) at a predetermined position is shorter when the viscous damper (3) is used.

従って、磁気ディスクの磁気ヘンド會駆動するのにステ
ップモータ（１）　ｔ−使用する場合は、磁気記録５体
への書き込み及び読み出しをはやくするｔめに、所定位
置への停止時間の短い粘性ダンパー＋３３　ｋ　！する
ステップモータロ】を−船釣には使用する０ 一方、粘性ダｙ　バー　＋３１　ｆ有するステップモー
タ１１）で負荷（図示せず）を角変位量の大きい駆動を
行った時は、ステップモータロ）の回転軸の回転時間が
長いため、ステップモータ（１）の回転軸に共動するダ
ンパーケース（６）と粘性体（５）との協動により慣性
体（４）は回転するようになる。Therefore, if a step motor (1) is used to drive the magnetic disk, a viscous damper with a short stopping time to a predetermined position is required to speed up writing and reading to and from the magnetic recording body. +33k! On the other hand, when driving a load (not shown) with a large angular displacement using a step motor 11) with a viscous diameter of +31 f, the step motor ), the inertial body (4) rotates due to the cooperation between the damper case (6) and the viscous body (5), which move together with the rotation axis of the step motor (1). .

従って、ステップモータ（１）の角変位量の大きい駆動
の停止段階にさしかかったと＠、上記慣性体（４）の回
転と粘性体（５）の粘性との協動により、ダンパーケー
ス（６）　０いてはステップモータ（１）の回転軸に回
転し読けさせようとする刀が働くという悪影響が出る。Therefore, when the step motor (1) reaches the stop stage of driving with a large amount of angular displacement, due to the cooperation of the rotation of the inertial body (4) and the viscosity of the viscous body (5), the damper case (6) 0 In this case, the rotating shaft of the step motor (1) has the negative effect of causing a blade to rotate and make it readable.

この悪影響はステップモータ（１）の税調の可能性を持
つ。This negative effect has the possibility of tax adjustment of the step motor (1).

上記慣性体（４）がステップモータ（１）の＠Ｊ転軸に
共動するダンパーケース（６）と粘性体（５）の協動に
より回転する回転量Ｃ二角速度）は同一粘性ダンバー（
３）を有する同一ステップモータロ）では、ステップモ
ータ（１）が駆動される時の角変位量と角速度に比例す
る。The amount of rotation (C2 angular velocity) at which the inertial body (4) rotates due to the cooperation of the damper case (6) and the viscous body (5) which move together with the @J rotation axis of the step motor (1) is the same viscous damper (
3), the angular displacement amount and angular velocity are proportional to the angular velocity when the step motor (1) is driven.

従って、粘性ダンパー（３）を有するステップモータロ
）を磁気ディスクの磁気ヘッドを駆動するのに使用する
場合は、最大角変位量を記録媒体の大きさにより決め、
その角変位量の範囲で税調が起こらないように最大角速
Ｆｆｔ−抑制し次構成にしてｉる０ 〔発明が解決しようとする問題点〕 従来の粘性タンバーを有するステップモータは以上のよ
うに構成されているので１例えば、磁気ティスフの磁気
ヘッドの駆動はこの粘性ダンパーを有するステップモー
タを使用する場合に、磁気記録媒体への書き込み及び読
出し時間のスピードアンプｒｓｐｇＥｌ）ＵＰ）即ち性
能向上を計るためには、粘性体の粘度を下げて大きい角
変位量の駆動時の角速ｒｔｔあげることが必要だが、そ
うすると、小さい角変位量の駆動を行うときに慣性体と
粘性体の協動によるステップモータの回転軸への制動が
栃くなって停止時間が長くなり１結果としてスピードア
ンプが計れなくなるという問題があった。Therefore, when using a step motor having a viscous damper (3) to drive a magnetic head of a magnetic disk, the maximum angular displacement amount is determined depending on the size of the recording medium.
The maximum angular velocity Fft is suppressed to prevent tax adjustment within the range of the angular displacement amount, and the following configuration is used. For example, when a step motor with a viscous damper is used to drive a magnetic head of a magnetic disk, a speed amplifier rspgEl)UP) for writing and reading time to a magnetic recording medium is used to improve performance. In order to achieve this, it is necessary to lower the viscosity of the viscous body and increase the angular velocity rtt when driving a large angular displacement, but in this case, when driving a small angular displacement, the step due to the cooperation of the inertial body and the viscous body There was a problem in that the braking on the rotating shaft of the motor was insufficient, resulting in a longer stopping time, and as a result, the speed amplifier could not be measured.

この発明は上記のような問題点を解決するためになされ
たもので、ステップモータ等の回転軸が停止しようとす
る時及び停止中にのみ慣性体と粘性体の粘性との協動に
よる制動を行うことができる粘性ダンパー装置を得るこ
とを目的とする。This invention was made in order to solve the above-mentioned problems, and only when the rotating shaft of a step motor, etc. is about to stop, and while it is stopped, braking is performed by the cooperation of the inertial body and the viscosity of the viscous body. The purpose is to obtain a viscous damper device that can perform

〔問題点を解決するための手段〕[Means for solving problems]

この発明に係る粘性ダンパー装置ｒｉ、駆動される軸に
装着され共動するダンパーケース、このダンパーケース
の内面壁と隙間を介して収容される円形りング状の慣性
体、上記隙間に収容される磁性流体及び付勢されること
により上記磁性流体に磁力を供給してその粘性を増加さ
せる電磁石を備えたものである。A viscous damper device ri according to the present invention, a damper case that is attached to a driven shaft and moves together, a circular ring-shaped inertia body that is housed in the inner wall of the damper case through a gap, and a circular ring-shaped inertia body that is housed in the gap. It is equipped with a magnetic fluid and an electromagnet that, when energized, supplies magnetic force to the magnetic fluid to increase its viscosity.

〔作用］ この発明における粘性ダンパー装置は、例えば駆動され
る軸の停止直前及び停止中は電磁石により磁力が供給さ
れて粘性の高くなった磁性流体の粘性と慣性体との協動
により上記軸の制動を行って上記軸の停止時間を短かく
し、停止直前を除いた上記軸の駆動中は磁性流体に磁力
が供給されないようにして粘性を落し、磁性流体の粘性
と慣性体との協動にＬａ制動を抑制して上記軸の角速度
を上げるようにする。[Function] In the viscous damper device of the present invention, for example, immediately before and during the stop of the driven shaft, magnetic force is supplied by an electromagnet, and the viscosity of the magnetic fluid, which has become high in viscosity, cooperates with the inertial body to cause the shaft to move. Braking is performed to shorten the stopping time of the above-mentioned shaft, and while the above-mentioned shaft is being driven except immediately before stopping, magnetic force is not supplied to the magnetic fluid to reduce the viscosity, and the viscosity of the magnetic fluid and the cooperation with the inertial body are reduced. La braking is suppressed to increase the angular velocity of the shaft.

〔実施例〕〔Example〕

以下、この発明を磁気ディスク装置の磁気ヘッド駆動用
のステップモータに適用し九−実施例を図について説明
する。第１図はこの発明の一実施例の構成図、第２図は
第１図の部分拡大の正面図（第２図Ａ）及び断面図（第
２図Ｂ）である。Hereinafter, a ninth embodiment in which the present invention is applied to a step motor for driving a magnetic head of a magnetic disk device will be described with reference to the drawings. FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a partially enlarged front view (FIG. 2A) and cross-sectional view (FIG. 2B) of FIG. 1.

第１図及び第２図において、　（１）、　１２＋、（４
）及び（６）は従来の装置と全く同じである。In Figures 1 and 2, (1), 12+, (4
) and (6) are exactly the same as in the conventional device.

αＧはダンパーケース（６）と慣性体（４）の隙間に充
填され、磁力が供給されｔ時は強い粘性を有し、磁力が
供給されない時は弱い粘性を有する磁性流体、（７）は
慣性体（４）、ダンパーケース（６）及び磁性流体（７
）により構成される粘性ダンパー、（８）は粘性ダンパ
ー（１）に磁力を供給する電磁石、（９）はステップモ
ータ（１）の回転軸の停止直前及び停止中にのみ電磁石
（８）に磁力を発生させる電流を流す粘性ダンパー制御
装置である。なお、ステップモータ（１）及びダンパー
制御装置（９）は図示しない磁気ディスク装置のモータ
駆動装置と接続され、ま友、ステップモータ（１）の出
力軸は図示しない磁気ディスクの磁気ヘッドと連結され
、この磁気ヘッドの移動上行って磁気ディスクに対する
位置決めをしている。αG is a magnetic fluid filled in the gap between the damper case (6) and the inertial body (4), and has strong viscosity at time t when magnetic force is supplied, and weak viscosity when no magnetic force is supplied, and (7) is a magnetic fluid that is inertial. body (4), damper case (6) and magnetic fluid (7)
), (8) is an electromagnet that supplies magnetic force to the viscous damper (1), and (9) is an electromagnet that applies magnetic force to the electromagnet (8) only immediately before and during the stop of the rotating shaft of the step motor (1). This is a viscous damper control device that sends a current that generates . The step motor (1) and damper control device (9) are connected to a motor drive device of a magnetic disk device (not shown), and the output shaft of the step motor (1) is connected to a magnetic head of a magnetic disk (not shown). , the magnetic head is moved and positioned relative to the magnetic disk.

次に動作について説明する。図示しない磁気ディスク装
置のモータ駆動装置の駆動信号によシステップモータ（
１）は駆動される。それと同時に粘性ダンパー制御装置
（９）は図示しない磁気ディスク装置のモータ駆動装置
により駆動開始信号を受信し、その駆動開始信号により
電磁石（８）へ電流を流すのを停止し粘性ダンパー（７
）への磁力の供給を断つ。Next, the operation will be explained. The step motor (
1) is driven. At the same time, the viscous damper control device (9) receives a drive start signal from the motor drive device of the magnetic disk device (not shown), stops the current flowing to the electromagnet (8) based on the drive start signal, and stops flowing the current to the viscous damper (7).
) cut off the supply of magnetic force to the

次に図示しない磁気ディスク装置のモータ駆動装置より
、ステップモータ（１）の回転軸の所定の角変位量の駆
動の完了直前の信号を粘性ダンパー制御装置（９）が受
信すると、粘性ダンパー制御装置（９）は電磁石（８）
へ電ａｋ供給し粘性ダンパー！７）へ磁力を供給する。Next, when the viscous damper control device (9) receives a signal immediately before the completion of driving the rotary shaft of the step motor (1) by a predetermined angular displacement amount from the motor drive device of the magnetic disk device (not shown), the viscous damper control device (9) is an electromagnet (8)
Supply electricity to the viscous damper! 7) Supply magnetic force to.

粘性ダンパー（１）の磁性流体四は文献「日本機械学会
論文集（Ｂ編）５２巻４８４号（昭６ｌ−１２）論’５
１：Ｎ０．８６０１１ＯＡ　磁性流体のレオロジー特性
に関する研究」の水ベース（Ｗ−３５）の磁性流体の特
性に示されるように、磁力全供給されない時に粘性はあ
まシ有せず、供給される磁力が強くなるほど粘性が増加
する。The magnetic fluid 4 of the viscous damper (1) is described in the literature ``Proceedings of the Japan Society of Mechanical Engineers (B edition), Vol. 52, No. 484 (Sho 6l-12) Theory'5.
As shown in the characteristics of water-based (W-35) magnetic fluid in ``Study on Rheological Properties of Magnetic Fluids'', the viscosity does not remain when the magnetic force is not fully supplied, and the supplied magnetic force is The stronger it is, the more viscous it becomes.

従って、ステップモータ（１）の駆動開始から駆動終了
直前迄磁性流体α０は粘性をほとんど有しないので、ス
テップモータ（１）の回７＠軸は慣性体（４）と磁性流
体Ｏ０の粘性との協動により制動をはとんど受けない。Therefore, since the magnetic fluid α0 has almost no viscosity from the start of driving the step motor (1) until just before the end of driving, the rotation 7 @ axis of the step motor (1) is due to the viscosity of the inertial body (4) and the magnetic fluid O0. Due to cooperation, it is hardly affected by braking.

従って、ステップモータロ）の回転軸の角加速はステッ
プモータ（１，）が有する能カー杯迄上げることができ
る。Therefore, the angular acceleration of the rotating shaft of the step motor (1,) can be increased to the maximum capacity of the step motor (1,).

又、この時慣性体（４）はステップモータ（１）の回転
軸と磁性流体α０の粘性との協動による回転力をほとん
ど受けないのでほぼ停止した状態でいる。Further, at this time, the inertial body (4) receives almost no rotational force due to the cooperation between the rotating shaft of the step motor (1) and the viscosity of the magnetic fluid α0, and therefore remains in a substantially stopped state.

一方、ステップモータ（１）の回転軸の駆動路ｒ直前か
ら停止中にわたって、磁性流体叫には磁力が供給される
ので、はぼ停止している慣性体（４）と磁性流体αＱの
粘性との協動に工９ダンパーケース（６）ひいてはステ
ップモータ＋１）の回転軸は制動を受け。On the other hand, since magnetic force is supplied to the magnetic fluid from just before the drive path r of the rotating shaft of the step motor (1) until it is stopped, the viscosity of the inertial body (4) and the magnetic fluid αQ, which are at a standstill, is Due to this cooperation, the rotary shaft of the damper case (6) and the step motor +1) is braked.

その友めにステップモータ（１）の回転軸は急速に所定
位置に停止するようになる。As a result, the rotating shaft of the step motor (1) rapidly stops at a predetermined position.

即チ、ステップ七−タ（１）に連結されている磁気ヘッ
ドの移動時間を短かくすることができる。こ。That is, it is possible to shorten the moving time of the magnetic head connected to the step seventer (1). child.

の粘性ダンパー　ｔａ）の動作は磁気ディスク装置に限
らず負荷を移動させて位置決めするものについては同じ
ように行わしめることができる。The operation of the viscous damper ta) is not limited to magnetic disk devices, but can be performed in the same way for devices that move and position a load.

ま九、磁性流体αＱに加える電磁石（８）の磁力を強く
しかつ慣性体（４）の重量も重くして、磁性流体α０と
慣性体（４）の協動による制動力がステップモータ１１
）の駆動力を上回るようにすれば、電磁石（８）の制御
のみで任意の位置にステップモータ（１）　ｉ停止させ
ることができる。Ninth, by increasing the magnetic force of the electromagnet (8) applied to the magnetic fluid αQ and increasing the weight of the inertial body (4), the braking force due to the cooperation of the magnetic fluid α0 and the inertial body (4) is applied to the step motor 11.
), it is possible to stop the step motor (1) at any position simply by controlling the electromagnet (8).

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明によれば、粘性ダンパー装置は
駆動される軸に装着され共動するダンパーケース、この
ダンパーケースの内面壁と隙間を介して収容される円形
リング状の慣性体、上記隙間に収容され九磁性流体及び
付勢される仁とにより上記磁性流体に磁力を供給してそ
の粘性を増加させる電磁石を備え、上記電磁石の磁力に
より増加した上記磁性流体の粘性と上記慣性体との協動
により上記ダンパーケースひいては上記軸の制動を行い
得るようにし友ので、この粘性ダンパー装置を１例えば
磁気ディスク装置の磁気ヘッド駆動用のステップモータ
に用いると、加速時には電磁石全消勢して磁性流体へ磁
力を供給せず、従って磁性流体の粘度を低く保ち、この
粘性と慣性体の協動により生じる制動力を弱くして磁気
ヘッドの移動時間を短かくすることができ、停止時には
電磁石を付勢してその磁力により粘性体の粘度を高くし
、この粘性と慣性体との協動により生じる制動力を強く
して停止時間を短かくすることができる。その結果、磁
気ディスク装置の書き込与速度及び読出し速度をはやく
することができ心とすう効果がある。As described above, according to the present invention, the viscous damper device includes a damper case that is attached to a driven shaft and moves together, a circular ring-shaped inertial body that is accommodated through a gap with the inner wall of the damper case, and the above-described components. An electromagnet is provided that is housed in the gap and increases the viscosity of the magnetic fluid by supplying magnetic force to the magnetic fluid using a magnetic fluid and an energized member, and the viscosity of the magnetic fluid increased by the magnetic force of the electromagnet and the inertial body Therefore, when this viscous damper device is used in, for example, a step motor for driving a magnetic head of a magnetic disk device, the electromagnet is completely deenergized during acceleration. By not supplying magnetic force to the magnetic fluid, the viscosity of the magnetic fluid is kept low, and the braking force generated by the cooperation between this viscosity and the inertial body is weakened, making it possible to shorten the travel time of the magnetic head. It is possible to increase the viscosity of the viscous body by energizing it and increase the viscosity of the viscous body by its magnetic force, and to strengthen the braking force generated by the cooperation of this viscosity and the inertial body, thereby shortening the stopping time. As a result, the write speed and read speed of the magnetic disk device can be increased, resulting in a speedy effect.

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

８ｇ１図はこの発明の一実施例の構成図、第２図は第１
図の一部分を示し、（転）は正面図、（Ｂ）は第２図ｔ
Ａｌの＃１Ｂ−Ｂに沿う断１図である。第３図は従来の
装置の構成図、第４図は第３図の一部分を示し、囚は正
面図、田）は第４図人）の線Ｂ−Ｈに沿う断面図である
。第５図はステップモータのイナーシャの減衰を示す特
性図である。 図において、（４）は慣性体、（６）はダンパーケース
。 （８）は電磁石、（９）は粘性ダンパー制御装置、αｑ
は磁性流体。 なお１図中同一符号は同一、又は相当部分を示す０Figure 8g1 is a configuration diagram of one embodiment of this invention, and Figure 2 is the first embodiment.
Part of the figure is shown, (roll) is the front view, (B) is the second figure t.
It is a cross-sectional view along #1B-B of Al. FIG. 3 is a block diagram of a conventional device, and FIG. 4 shows a part of the device shown in FIG. FIG. 5 is a characteristic diagram showing attenuation of inertia of the step motor. In the figure, (4) is an inertial body, and (6) is a damper case. (8) is an electromagnet, (9) is a viscous damper control device, αq
is a magnetic fluid. In addition, the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

【特許請求の範囲】[Claims] 駆動される軸に装着され共動するダンパーケース、この
ダンパーケースの内面壁と隙間を介して収容される円形
リング状の慣性体、上記隙間に収容される磁性流体及び
付勢されることにより上記磁性流体に磁力を供給してそ
の粘性を増加させる電磁石を備えた粘性ダンパー装置。A damper case that is attached to the driven shaft and moves together, a circular ring-shaped inertial body that is housed through a gap with the inner wall of the damper case, a magnetic fluid that is housed in the gap, and a magnetic fluid that is energized. A viscous damper device equipped with an electromagnet that supplies magnetic force to a magnetic fluid to increase its viscosity.
JP24845787A 1987-10-01 1987-10-01 Viscosity damper device Pending JPH0193644A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP24845787A JPH0193644A (en) 1987-10-01 1987-10-01 Viscosity damper device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP24845787A JPH0193644A (en) 1987-10-01 1987-10-01 Viscosity damper device

Publications (1)

Publication Number Publication Date
JPH0193644A true JPH0193644A (en) 1989-04-12

Family

ID=17178419

Family Applications (1)

Application Number Title Priority Date Filing Date
JP24845787A Pending JPH0193644A (en) 1987-10-01 1987-10-01 Viscosity damper device

Country Status (1)

Country Link
JP (1) JPH0193644A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0344593A (en) * 1989-07-12 1991-02-26 Toshiba Corp Positioning apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0344593A (en) * 1989-07-12 1991-02-26 Toshiba Corp Positioning apparatus

Similar Documents

Publication Publication Date Title
CN114800455B (en) Controllable joint driver based on magnetorheological
JPH1158181A (en) Dividing device and driving method thereof
JP7161844B2 (en) rotary braking device
JPH0676014B2 (en) Rotational fluctuation reducing device for engine power transmission system
US4703242A (en) Control method and apparatus for positioning servo system
JP2000243045A (en) Positioning stop device, positioning stop method, and disk drive device
JPH0136343B2 (en)
JPH0643039B2 (en) Arm drive device for articulated robot
JP2710226B2 (en) Carriage body structure of optical disk device
JP3032418B2 (en) Magnetic recording / reproducing device
JPH01206898A (en) converter
JPS61172277A (en) carriage drive
JPH02309046A (en) Ball screw rotation stopping mechanism
JPS61246967A (en) Positioning mechanism for magnetic head carriage
JPH0525088Y2 (en)
JPH0380474A (en) Actuator for magnetic disk device
JPS62256271A (en) Magnetic disk device
JPS628377A (en) Head moving damper device
JPS6044957B2 (en) sewing machine control device
CN120460910A (en) A laser marking device for energy storage battery production
JPH05141425A (en) Bearing structure
JPH0525087Y2 (en)
JPH0139112Y2 (en)
JPS61121113A (en) Position control mechanism of automatic analyzer
JPH0344593A (en) Positioning apparatus