JPH02273063A - Actuator - Google Patents

Actuator

Info

Publication number
JPH02273063A
JPH02273063A JP9081589A JP9081589A JPH02273063A JP H02273063 A JPH02273063 A JP H02273063A JP 9081589 A JP9081589 A JP 9081589A JP 9081589 A JP9081589 A JP 9081589A JP H02273063 A JPH02273063 A JP H02273063A
Authority
JP
Japan
Prior art keywords
permanent magnet
actuator
movable armature
movable
poles
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
JP9081589A
Other languages
Japanese (ja)
Inventor
Yoji Arita
陽二 有田
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 Kasei Corp
Original Assignee
Mitsubishi Kasei 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 Kasei Corp filed Critical Mitsubishi Kasei Corp
Priority to JP9081589A priority Critical patent/JPH02273063A/en
Publication of JPH02273063A publication Critical patent/JPH02273063A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To obtain an energy-saving type actuator, simple in constitution and capable of being driven smoothly, by a method wherein the actuator is formed of a coil, separated from a movable armature consisting of a soft magnetic body and fixed, a permanent magnet, having two poles magnetized uniformly, and a magnetic yoke. CONSTITUTION:A movable armature 1 is provided with an I-shape in plan and is constituted of the laminated body of a soft magnetic material such as soft iron or the like while the armature 1 is movable along the permanent magnet 3 of two poles. A coil 2 and a magnetic yoke 4 are provided around the movable armature 1. Respective magnetic poles of the permanent magnet 3 are magnetized uniformly substantially while an actuator without generating any thrust ripple may be obtained by a method wherein the distance H1 in the direction of the height of a boundary L between the N-pole and the S-pole is maximized and the distance is elongated sequentially toward both ends of the movable range of said movable armature 1. According to this method, the actuator, high in the operating point of the permanent magnet, saving energy and constant in the thrust thereof, may be obtained.

Description

【発明の詳細な説明】 (産業上の利用分野) この発明は、アクチュエータ、特に光磁気記録配置やハ
ードディスクドライブ配置等の記録再生ヘッドのシーク
機構等、高速精密穆動用のアクチュエータに関するもの
である。
DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an actuator, and particularly to an actuator for high-speed precision movement such as a seek mechanism of a recording/reproducing head in a magneto-optical recording arrangement or a hard disk drive arrangement.

(従来の技術) 第9図は従来例に係るボイスコイル型(以下VCMと記
す)アクチュエータを示している。このVCMアクチュ
エータは永久磁石11が発生する磁束が磁気ヨーク12
に入るようになっており、磁気ヨーク12の周囲に巻か
れた可動用空心コイル13は前記磁束を横切るように前
記磁気ヨーク12に沿って移動する。
(Prior Art) FIG. 9 shows a voice coil type (hereinafter referred to as VCM) actuator according to a conventional example. In this VCM actuator, the magnetic flux generated by the permanent magnet 11 is connected to the magnetic yoke 12.
The movable air-core coil 13 wound around the magnetic yoke 12 moves along the magnetic yoke 12 so as to cross the magnetic flux.

(発明が解決しようとする課題〕 しかし、70Mアクチュエータにおいては可動用空心コ
イル13が前記永久磁石11と前記磁気ヨーク12の間
に存在するため磁極間のギャップが大きく、したがって
、永久磁石11の動作点としては低くならざるを得ない
という欠点があった。つまり、永久磁石11が発生する
磁束密度は永久磁石11のエネルギー積の割には小さく
、効率の低いアクチュエータとならざるを得す、所望の
推力を得るためには可動用空心コイル13に大電流を流
すといった方法が取られてきた。しかし、こうした方法
はジュール熱によって記録配置内の各部品の熱膨張差を
引き起し、時により書き込まれた情報の読み出しを困難
にするといった問題点があった。
(Problem to be Solved by the Invention) However, in the 70M actuator, since the movable air-core coil 13 exists between the permanent magnet 11 and the magnetic yoke 12, the gap between the magnetic poles is large, and therefore the operation of the permanent magnet 11 is In other words, the magnetic flux density generated by the permanent magnet 11 is small compared to the energy product of the permanent magnet 11, resulting in an actuator with low efficiency. In order to obtain this thrust, a method has been used in which a large current is passed through the movable air-core coil 13.However, these methods cause differences in thermal expansion of each component in the recording arrangement due to Joule heat, and sometimes There was a problem in that it was difficult to read the written information.

この発明は、上記の点に鑑みなされたものであり、構成
が簡単で円滑な駆動を可能とする省エネルギー型のアク
チュエータを提供することを目的とする。
The present invention has been made in view of the above points, and an object of the present invention is to provide an energy-saving actuator that has a simple configuration and enables smooth driving.

(課題を解決するための手段) この発明にかかるアクチュエータは、軟磁性体からなる
可動アーマチュアから分離固定されているコイルと、こ
の可動アーマチュアの進行方向に沿い、片側または両側
に配置された2極の永久磁石と、可動アーマチュアおよ
び永久磁石を取り囲むように配設された磁気ヨークとか
らなり、さらに永久磁石はN極とS極の両磁極が均一に
磁化されており、また、これらN極とS極の境界部の高
さ方向の距離が最も短く、その境界部から可動アーマチ
ュアの可動範囲の両端に向い順次長く形成したものであ
る。
(Means for Solving the Problems) An actuator according to the present invention includes a coil that is separated and fixed from a movable armature made of a soft magnetic material, and two poles arranged on one or both sides along the direction of movement of the movable armature. It consists of a permanent magnet, and a magnetic yoke arranged so as to surround a movable armature and the permanent magnet.Furthermore, the permanent magnet has both N and S poles magnetized uniformly. The distance in the height direction of the boundary part of the S pole is the shortest, and the distance from the boundary part to both ends of the movable armature is gradually increased.

(作用) この発明においては、コイルに通電することによって、
可動アーマチュアが所定方向に移動する。
(Function) In this invention, by energizing the coil,
A movable armature moves in a predetermined direction.

(実施例) 第1図はこの発明によるアクチュエータの一実施例を示
す斜視図である。
(Embodiment) FIG. 1 is a perspective view showing an embodiment of an actuator according to the present invention.

第1図において、移動方向のガイドは省略しであるが、
1は可動アーマチュアで、平面がI形をしており、軟鉄
のような軟磁性材の積層体からなり、2極の永久磁石3
に沿って穆勤するようになっている。2はコイル、4は
磁気ヨークである。
In Fig. 1, the guide in the direction of movement is omitted, but
1 is a movable armature, which has an I-shaped plane, is made of a laminated body of soft magnetic material such as soft iron, and has a two-pole permanent magnet 3.
I am supposed to work hard according to this. 2 is a coil, and 4 is a magnetic yoke.

この永久磁石3の形状は第2図のようにN極とS極の境
界部りの高さ方向の距離H8が最も短く、可動アーマチ
ュア1の可動範囲の両端に向い順次長くなっている。H
2は端部における高さ方向の距離である。また、コイル
5は可動アーマチュア1から分離独立しており、第1図
のように可動アーマチュア1を囲むか、あるいは外側の
磁気ヨーク4を囲むようにしてもよい。
As shown in FIG. 2, the permanent magnet 3 has the shortest distance H8 in the height direction at the boundary between the N and S poles, and gradually becomes longer toward both ends of the movable range of the movable armature 1. H
2 is the distance in the height direction at the end. Further, the coil 5 is separate and independent from the movable armature 1, and may surround the movable armature 1 as shown in FIG. 1, or may surround the outer magnetic yoke 4.

コイル2に電流を流したととの推力と無通電状態でのレ
ラクタンス力を第3図に示す。この第3図から明らかな
ように、レラクタンスカはほとんど発生せず、推力も端
部を除いてほぼ一定の値が得られる。
Figure 3 shows the thrust force when current is applied to the coil 2 and the reluctance force when no current is applied. As is clear from FIG. 3, almost no reluctance is generated, and the thrust is approximately constant except at the ends.

このように、移動子を可動アーマチュア1としたため永
久磁石3と可動アーマチュア1とのエアーギャップは、
例えば0.5mm以下と非常に小さくすることができ、
永久磁石3の動作点が高く、大きな磁束密度が得られ、
高出力のアクチュエータが構成できる。また、コイルが
分離独立しているため、大きな電流が流せ、かつ可動部
の重量を減少させることができる。
In this way, since the mover is the movable armature 1, the air gap between the permanent magnet 3 and the movable armature 1 is
For example, it can be made very small, less than 0.5 mm.
The operating point of the permanent magnet 3 is high, and a large magnetic flux density can be obtained.
High output actuators can be configured. Furthermore, since the coils are separate and independent, a large current can flow and the weight of the movable parts can be reduced.

しかし、この構成で永久磁石3が均一の高さをもち各N
極およびS極を均一に完全に着磁を施したとすると、レ
ラクタンスカによる推力リップルが発生する。この場合
N極−5極の境界部りを可動アーマチュア1の中央が向
い合った位置で可動アーマチュア1が最も安定する。
However, with this configuration, the permanent magnet 3 has a uniform height and each N
If the poles and S poles are uniformly and completely magnetized, thrust ripples will occur due to reluctance. In this case, the movable armature 1 is most stable at a position where the center of the movable armature 1 faces the boundary between the N and 5 poles.

、第4図はこの状態でコイル2に電流を流したときの推
力と無通電状態でのレラクタンスカを可動アーマチュア
1の各位置に対して示したものである。なお、原点は可
動アーマチュア1の中央が永久磁石3のN極とS極の境
界部りに一致した点とする。第4図から明らかなように
推力はアーマチュアの位置に依存し一定にはならない。
FIG. 4 shows the thrust when current is applied to the coil 2 in this state and the reluctance in the non-energized state for each position of the movable armature 1. The origin is the point where the center of the movable armature 1 coincides with the boundary between the N and S poles of the permanent magnet 3. As is clear from FIG. 4, the thrust depends on the position of the armature and is not constant.

この発明では、レラクタンス力を無視できる程度まで減
少させ、かつ各位置における推力を一定に保つために種
々検討した結果、上述したように永久磁石3は実質的に
各磁極が均一に磁化されており、N極とS極の境界部り
の高さ方向距離H1を最も長く、また、その境界部りか
ら前記可動アーマチュア1の可動範囲の両端に向い順次
長くすることにより推力リップルが発生しないアクチュ
エータが得られた。
In this invention, as a result of various studies in order to reduce the reluctance force to a negligible level and to keep the thrust force constant at each position, the permanent magnet 3 is substantially uniformly magnetized at each magnetic pole, as described above. , the distance H1 in the height direction at the boundary between the N and S poles is the longest, and by increasing the distance H1 in the height direction from the boundary toward both ends of the movable range of the movable armature 1, an actuator that does not generate thrust ripples can be obtained. Obtained.

第5図は永久磁石3A、3Bを磁気ヨーク4の内側の両
端にも配置したアクチュエータであり、こうすることに
よって両端部における推力の低下を防ぐことができ、ス
トロークを長く取ることがで籾る。
Fig. 5 shows an actuator in which permanent magnets 3A and 3B are also arranged at both ends inside the magnetic yoke 4. By doing so, it is possible to prevent the thrust force from decreasing at both ends, and by taking a long stroke, it is possible to .

第6図は、第5図に示すアクチュエータの特性図であり
、第3図の特性図に比較して端部まで推力が一定である
ことがわかる。
FIG. 6 is a characteristic diagram of the actuator shown in FIG. 5, and compared to the characteristic diagram of FIG. 3, it can be seen that the thrust force is constant up to the end.

第7図は永久磁石3を可動アーマチュア1の両側に配置
した実施例であり、こうすることによってさらに高出力
のアクチュエータが構成できる。
FIG. 7 shows an embodiment in which permanent magnets 3 are arranged on both sides of the movable armature 1, and by doing so, an actuator with even higher output can be constructed.

第8図はこの発明のさらに他の実施例を示す斜視図であ
り、磁気ヨーク4の平面形状を円弧状として可動アーマ
チュア1の動きが円弧を描くように駆動し、かつ電流の
向きが互いに逆のコイル5A、5Bを磁気ヨーク4を囲
むように構成したアクチュエータの斜視図である。
FIG. 8 is a perspective view showing still another embodiment of the present invention, in which the planar shape of the magnetic yoke 4 is arc-shaped, the movement of the movable armature 1 is driven in a circular arc, and the directions of the currents are opposite to each other. FIG. 2 is a perspective view of an actuator in which coils 5A and 5B are configured to surround a magnetic yoke 4.

このように構成すると、アクチュエータは積層した板状
の単純な形状でよく慣性質量も小さくなる。
With this configuration, the actuator may have a simple stacked plate shape and its inertial mass can be reduced.

この場合でも、原理は上記第1図、第5図、第7図の実
施例の直線駆動型のものと全く同じである。
Even in this case, the principle is exactly the same as that of the linear drive type embodiments shown in FIGS. 1, 5, and 7.

〔発明の効果〕〔Effect of the invention〕

この発明は以上詳細に説明したように、軟磁性体にから
なる可動アーマチュアと、この可動アーマチュアから分
離固定されているコイルと、この可動アーマチュアの進
行方向に沿い、片側または両側に配置された2極の永久
磁石と、可動アーマチュアおよび永久磁石を取り囲むよ
うに配設された磁気ヨークとからなり、さらに永久磁石
はN81とS極の両磁極が均一に磁化されており、また
、これらN極とS極の境界部の高さ方向の距離が最も短
くその境界部とから可動アーマチュアの可動範囲の両端
に向い順次長く形成したので、永久磁石の動作点が高く
、省エネルギー型で、かつ推力が一定のアクチュエータ
が得られる利点がある。
As described in detail above, the present invention includes a movable armature made of a soft magnetic material, a coil separated and fixed from the movable armature, and two coils arranged on one or both sides along the direction of movement of the movable armature. It consists of a permanent magnet as a pole, and a magnetic yoke arranged to surround the movable armature and the permanent magnet.The permanent magnet has both N81 and S poles uniformly magnetized, and these N and S poles are uniformly magnetized. The distance in the height direction at the boundary of the S pole is the shortest, and the length is gradually increased from the boundary to both ends of the movable armature's movable range, so the operating point of the permanent magnet is high, energy saving, and thrust is constant. This has the advantage of providing an actuator of

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

第1図はこの発明の一実施例を示す斜視図、第2図は、
第1図の実施例の永久磁石の形状を示す斜視図、第3図
は同じくこの発明におけるアーマチェア位置と推力との
関係を示す図、第4図は永久磁石の厚みが均一な場合の
アクチュエータ位置と推力との関係を示す図、第5図は
この発明の他の実施例を示す斜視図、第6図は、第5図
の実施例におけるアクチエエータ位置と推力との関係を
示す図、第7図はこの発明のさらに他の実施例を示す斜
視図、第8図はこの発明のさらに他の実施例を示す斜視
図、第9図は従来のアクチュエータの一例を示す斜視図
である。 図中、1は可動アーマチュア、2はコイル、3は永久磁
石、4は磁気ヨークでる。 第1図 第 図 第 図 −7−マチニア&!(狙勾A直) 第 図 第 図 第 図 第 図 第 図 第 図
FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a perspective view showing an embodiment of the present invention.
FIG. 1 is a perspective view showing the shape of the permanent magnet in the embodiment, FIG. 3 is a diagram showing the relationship between armchair position and thrust force in the present invention, and FIG. 4 is the actuator position when the thickness of the permanent magnet is uniform. FIG. 5 is a perspective view showing another embodiment of the present invention. FIG. 6 is a diagram showing the relationship between actuator position and thrust in the embodiment of FIG. 5. FIG. 8 is a perspective view showing still another embodiment of the invention, FIG. 9 is a perspective view showing an example of a conventional actuator. In the figure, 1 is a movable armature, 2 is a coil, 3 is a permanent magnet, and 4 is a magnetic yoke. Figure 1 Figure Figure -7-Matineer &! (Aiming angle A straight) Figure Figure Figure Figure Figure Figure

Claims (1)

【特許請求の範囲】[Claims] 軟磁性体から成る可動アーマチュアと、この可動アーマ
チュアから分離固定されているコイルと、前記可動アー
マチュアの進行方向に沿い、片側または両側に配置され
た2極の永久磁石と、前記可動アーマチュアおよび前記
永久磁石を取り囲むように配設された磁気ヨークとから
なり、さらに前記永久磁石はN極とS極の両磁極が均一
に磁化されており、また、これらN極とS極の境界部の
高さ方向の距離が最も短く、その境界部から前記可動ア
ーマチュアの可動範囲の両端に向い順次長く形成したこ
とを特徴とするアクチュエータ。
a movable armature made of a soft magnetic material; a coil separated and fixed from the movable armature; a two-pole permanent magnet disposed on one side or both sides along the traveling direction of the movable armature; It consists of a magnetic yoke arranged so as to surround a magnet, and the permanent magnet has both N and S poles uniformly magnetized, and the height of the boundary between these N and S poles is An actuator characterized in that the distance in the direction is the shortest, and the distance in the direction is the shortest, and the distance in the direction is the shortest, and the distance is gradually increased from the boundary toward both ends of the movable range of the movable armature.
JP9081589A 1989-04-12 1989-04-12 Actuator Pending JPH02273063A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9081589A JPH02273063A (en) 1989-04-12 1989-04-12 Actuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9081589A JPH02273063A (en) 1989-04-12 1989-04-12 Actuator

Publications (1)

Publication Number Publication Date
JPH02273063A true JPH02273063A (en) 1990-11-07

Family

ID=14009093

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9081589A Pending JPH02273063A (en) 1989-04-12 1989-04-12 Actuator

Country Status (1)

Country Link
JP (1) JPH02273063A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006035239A (en) * 2004-07-22 2006-02-09 Hitachi Via Mechanics Ltd Oscillating actuator and laser beam machining apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006035239A (en) * 2004-07-22 2006-02-09 Hitachi Via Mechanics Ltd Oscillating actuator and laser beam machining apparatus

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