JPH07274468A - Movable magnet type actuator - Google Patents
Movable magnet type actuatorInfo
- Publication number
- JPH07274468A JPH07274468A JP7996194A JP7996194A JPH07274468A JP H07274468 A JPH07274468 A JP H07274468A JP 7996194 A JP7996194 A JP 7996194A JP 7996194 A JP7996194 A JP 7996194A JP H07274468 A JPH07274468 A JP H07274468A
- Authority
- JP
- Japan
- Prior art keywords
- magnet
- rare earth
- permanent magnet
- earth permanent
- movable
- 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.)
- Granted
Links
Landscapes
- Electromagnets (AREA)
- Reciprocating, Oscillating Or Vibrating Motors (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、制御機器、電子機器、
工作機械等において電気エネルギーを電磁作用により往
復運動エネルギー等に変換させる可動磁石式アクチュエ
ータに関する。The present invention relates to a control device, an electronic device,
The present invention relates to a movable magnet actuator that converts electric energy into reciprocating kinetic energy and the like by electromagnetic action in machine tools and the like.
【０００２】[0002]
【従来の技術】従来、この種の可動磁石式アクチュエー
タとしては、本出願人が実願平５−３５５１９号で提案
しているものがある。この実願平５−３５５１９号の可
動磁石式アクチュエータは、貫通軸体を一体化した磁石
可動体を用い、駆動コイルを配置したボビンの内側に前
記磁石可動体を配置するとともに、ボビン外側に固定の
軸受部材で前記貫通軸体を摺動自在に支える構造となっ
ている。2. Description of the Related Art Conventionally, as a movable magnet type actuator of this type, there is one proposed by the present applicant in Japanese Patent Application No. 5-35519. The movable magnet type actuator of Japanese Patent Application No. 5-35519 uses a magnet movable body in which a penetrating shaft body is integrated, and arranges the magnet movable body inside a bobbin in which a drive coil is arranged and fixes it outside the bobbin. The bearing member has a structure that slidably supports the through shaft.
【０００３】[0003]
【発明が解決しようとする課題】ところで、上記したよ
うな貫通軸体を軸受部材で支持する可動磁石式アクチュ
エータの構造の場合、以下に述べる問題点がある。The structure of the movable magnet type actuator which supports the penetrating shaft body by the bearing member as described above has the following problems.
【０００４】(1) 貫通軸体を支えるための軸受部材
と、該軸受部材をボビン又は外装ケース等に保持するた
めの保持部材が必要となり、全長が長くなる嫌いがあ
る。(1) A bearing member for supporting the penetrating shaft and a holding member for holding the bearing member on a bobbin or an outer case are required, and there is a tendency that the total length becomes long.
【０００５】(2) 出力軸となる貫通軸体の一端部の反
対側にデッドスペースが生じる。すなわち、貫通軸体の
反対側端部が動作時に突出することを考慮して余分なス
ペースをあけておく必要がある。(2) A dead space is formed on the opposite side of the one end of the through shaft serving as the output shaft. That is, it is necessary to leave an extra space in consideration of the fact that the opposite end of the penetrating shaft projects during operation.
【０００６】(3) 軸受部材と保持部材が必要となるた
め、部品点数が多くなり、組立にもそれだけ手間がかか
る。(3) Since the bearing member and the holding member are required, the number of parts is increased, and the assembling is time-consuming.
【０００７】本発明の第１の目的は、全長を短くして小
型化を図ることのできる可動磁石式アクチュエータを提
供することにある。A first object of the present invention is to provide a movable magnet type actuator which can be reduced in size by shortening its overall length.
【０００８】本発明の第２の目的は、部品点数を削減し
て構造の簡略化を図りあわせて組立を容易にすることが
できる可動磁石式アクチュエータを提供することにあ
る。A second object of the present invention is to provide a movable magnet type actuator which can reduce the number of parts and simplify the structure to facilitate the assembly.
【０００９】本発明のその他の目的や新規な特徴は後述
の実施例において明らかにする。Other objects and novel features of the present invention will be clarified in Examples described later.
【００１０】[0010]
【課題を解決するための手段】上記目的を達成するため
に、本発明の可動磁石式アクチュエータは、希土類永久
磁石の端部又は外周の少なくとも一部分に摺動部材を一
体化し、かつ当該摺動部材が最大径部となるように磁石
可動体を構成し、駆動コイルを配置したボビンの内側に
前記磁石可動体を移動自在に設けた構成としている。In order to achieve the above object, a movable magnet type actuator of the present invention has a sliding member integrated with at least a part of an end or an outer periphery of a rare earth permanent magnet, and the sliding member. Is the maximum diameter portion, and the magnet movable body is movably provided inside the bobbin in which the drive coil is arranged.
【００１１】また、前記ボビンの内周に非磁性パイプを
配置し、該非磁性パイプの内側に前記磁石可動体を移動
自在に設けてもよい。A non-magnetic pipe may be arranged on the inner circumference of the bobbin, and the magnet movable body may be movably provided inside the non-magnetic pipe.
【００１２】前記希土類永久磁石と摺動部材のうち少な
くとも前記希土類永久磁石を穴あき構造とし、前記希土
類永久磁石を貫通する貫通軸体に前記希土類永久磁石を
固定して前記磁石可動体を構成してもよい。その際、前
記貫通軸体に係合する止め輪で少なくとも前記希土類永
久磁石を当該貫通軸体に固定することができる。At least the rare earth permanent magnet of the rare earth permanent magnet and the sliding member has a holed structure, and the rare earth permanent magnet is fixed to a penetrating shaft that penetrates the rare earth permanent magnet to form the movable magnet body. May be. At that time, at least the rare earth permanent magnet can be fixed to the through shaft by a retaining ring that engages with the through shaft.
【００１３】前記磁石可動体が前記希土類永久磁石の外
周に前記摺動部材を被せて一体化したものであってもよ
い。The magnet movable body may be one in which the outer circumference of the rare earth permanent magnet is covered with the sliding member and integrated.
【００１４】前記希土類永久磁石の少なくとも外周部を
金属又は樹脂でコーティングした構成としてもよい。At least the outer peripheral portion of the rare earth permanent magnet may be coated with a metal or a resin.
【００１５】前記ボビンに検出コイルを設けて、前記磁
石可動体の移動に伴う誘起電圧を検出する構成とするこ
ともできる。A detection coil may be provided on the bobbin to detect an induced voltage associated with the movement of the movable magnet body.
【００１６】[0016]
【作用】本発明の可動磁石式アクチュエータにおいて、
磁石可動体に発生する推力は、当該磁石可動体による磁
界が、通電時の駆動コイルに作用するフレミングの左手
の法則に基づいて与えられる推力に準ずるものである
（フレミングの左手の法則はコイルに対して適用される
が、ここでは駆動コイルが固定のため、磁石可動体にコ
イルに作用する力の反力としての推力が発生する。）。
したがって、推力に寄与するのは、磁石可動体が有する
希土類永久磁石の磁束の垂直成分（希土類永久磁石の軸
方向に直交する成分）である。また、磁石可動体が、駆
動コイルの巻かれたボビン内を移動する際、該磁石可動
体の最大径部が樹脂又は金属等の摺動部材となっている
ため、該摺動部材が前記ボビン内周部を直接接触しなが
ら摺動することができる。In the movable magnet type actuator of the present invention,
The thrust generated in the magnet moving body is similar to the thrust given to the magnetic field by the magnet moving body based on Fleming's left-hand rule that acts on the drive coil when energized (Fleming's left-hand rule applies to the coil. However, since the drive coil is fixed here, thrust is generated as a reaction force of the force acting on the coil on the movable magnet body.)
Therefore, it is the vertical component of the magnetic flux of the rare earth permanent magnet of the magnet movable body (the component orthogonal to the axial direction of the rare earth permanent magnet) that contributes to the thrust. Further, when the magnet movable body moves inside the bobbin around which the drive coil is wound, since the maximum diameter portion of the magnet movable body is a sliding member such as resin or metal, the sliding member is the bobbin. It is possible to slide while directly contacting the inner peripheral portion.
【００１７】また、前記ボビンの内周に非磁性パイプを
配置し、該非磁性パイプの内側に前記磁石可動体を移動
自在に設けた場合、耐摩耗性を改善して長寿命化を図る
ことができる。Further, when a non-magnetic pipe is arranged on the inner circumference of the bobbin and the magnet movable body is movably provided inside the non-magnetic pipe, wear resistance can be improved to prolong the service life. it can.
【００１８】前記希土類永久磁石と摺動部材のうち少な
くとも前記希土類永久磁石を穴あき構造とし、前記希土
類永久磁石を貫通する貫通軸体に前記希土類永久磁石を
固定して前記磁石可動体を構成した場合、前記貫通軸体
に前記希土類永久磁石を確実に固定できしかも前記貫通
軸体の端部を出力軸として利用することができる。ま
た、前記貫通軸体に係合する止め輪で少なくとも前記希
土類永久磁石を当該貫通軸体に容易に固定することが可
能となる。Of the rare earth permanent magnet and the sliding member, at least the rare earth permanent magnet has a perforated structure, and the rare earth permanent magnet is fixed to a penetrating shaft that penetrates the rare earth permanent magnet to form the magnet movable body. In this case, the rare earth permanent magnet can be securely fixed to the through shaft, and the end of the through shaft can be used as the output shaft. Moreover, it becomes possible to easily fix at least the rare earth permanent magnet to the through shaft with the retaining ring that engages with the through shaft.
【００１９】前記磁石可動体が前記希土類永久磁石の外
周に前記摺動部材を被せて一体化したものである場合、
当該磁石可動体の部品点数を削減することができる。In the case where the movable magnet body is formed by covering the outer circumference of the rare earth permanent magnet with the sliding member,
The number of parts of the magnet movable body can be reduced.
【００２０】前記希土類永久磁石の少なくとも外周部を
金属又は樹脂でコーティングした構成とした場合、前記
希土類永久磁石の腐食、劣化等を防止することができ
る。When at least the outer peripheral portion of the rare earth permanent magnet is coated with a metal or a resin, it is possible to prevent corrosion and deterioration of the rare earth permanent magnet.
【００２１】前記ボビンに検出コイルを設けて、前記磁
石可動体の移動に伴う誘起電圧を検出する構成として、
前記磁石可動体の移動速度やその位置を検出することが
できる。A detection coil is provided on the bobbin to detect an induced voltage caused by the movement of the movable magnet body.
The moving speed of the magnet movable body and its position can be detected.
【００２２】[0022]
【実施例】以下、本発明に係る可動磁石式アクチュエー
タの実施例を図面に従って説明する。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a movable magnet type actuator according to the present invention will be described below with reference to the drawings.
【００２３】図１乃至図３は本発明の第１実施例を示
す。これらの図において、１は内周部が円周面となった
ガイド円筒体を兼ねた絶縁樹脂製ボビンであり、両端部
に鍔部１ａ，１ｂを有するとともに中間部にも中間鍔部
１ｃを有している。中間鍔部１ｃの一部は端子台１ｄと
なっており、図３のようにここに４本の端子ピン２ａ，
２ｂ，２ｃ，２ｄが植設されている。中間鍔部１ｃで２
分されたボビン１の外周部には、２連の駆動コイル３
ａ，３ｂがそれぞれ巻回されている。この２連の駆動コ
イル３ａ，３ｂは、相互に異なる向きに電流が流れるよ
うに結線され、その両端の巻線引き出し端が、例えば前
記端子ピン２ａ，２ｂに接続されている。また、ボビン
１には、２連の駆動コイル３ａ，３ｂの外側に対し検出
コイル４が巻回され、その巻線引き出し端が、例えば前
記端子ピン２ｃ，２ｄに接続されている。そして、ボビ
ン１の周囲に駆動コイル３ａ，３ｂ及び検出コイル４の
周囲を囲む如く軟磁性体の円筒状ヨーク５が装着されて
いる。但し、円筒状ヨーク５には切り欠きが設けてあ
り、前記端子台１ｄは円筒状ヨーク５外部に露出するよ
うになっている。1 to 3 show a first embodiment of the present invention. In these figures, reference numeral 1 denotes an insulating resin bobbin which also serves as a guide cylinder whose inner peripheral portion is a circumferential surface, and which has flange portions 1a and 1b at both ends and an intermediate flange portion 1c at the intermediate portion. Have A part of the intermediate collar portion 1c serves as a terminal block 1d, and as shown in FIG. 3, four terminal pins 2a,
2b, 2c, 2d are planted. 2 in the intermediate collar part 1c
Two drive coils 3 are provided on the outer periphery of the divided bobbin 1.
A and 3b are respectively wound. The two drive coils 3a and 3b are connected so that currents flow in mutually different directions, and the winding lead-out ends at both ends thereof are connected to the terminal pins 2a and 2b, for example. A detection coil 4 is wound around the bobbin 1 around the outside of the two drive coils 3a and 3b, and the winding lead-out end is connected to the terminal pins 2c and 2d, for example. A soft magnetic cylindrical yoke 5 is mounted around the bobbin 1 so as to surround the drive coils 3a and 3b and the detection coil 4. However, the cylindrical yoke 5 is provided with a notch so that the terminal block 1d is exposed to the outside of the cylindrical yoke 5.
【００２４】一方、磁石可動体１０は、例えば軸方向に
着磁された穴あき円柱状希土類永久磁石１１、この永久
磁石１１の両端に配置された穴あき円板状摺動部材１２
ａ，１２ｂ及び一方の円板状摺動部材１２ａの外側位置
に配置された穴あき円板状クッション板１３に金属貫通
軸体１４を挿通し、該金属貫通軸体１４の係合溝１５に
止め具（金属製Ｅリング）１６を嵌め込み係止して、当
該金属貫通軸体１４に永久磁石１１、摺動部材１２ａ，
１２ｂ及びクッション板１３を固定したものである。こ
こで、貫通軸体１４は非磁性又は磁性金属であり、クッ
ション板１３はシリコンゴム等の弾性材であり、多少圧
縮状態で一対の止め具１６間に挟持されている。この結
果、クッション板１３は永久磁石１１及び摺動部材１２
ａ，１２ｂの厚みのばらつきを吸収してがたつきを防止
することができる。前記穴あき円板状摺動部材１２ａ，
１２ｂは、穴あき円柱状希土類永久磁石１１及びクッシ
ョン板１３の外径よりも大きな外径寸法を有するもの
で、摩擦係数の小さな耐摩耗性の金属又は樹脂で形成さ
れている。例えば、金属（磁性又は非磁性のいずれでも
よい）であればステンレス等であり、樹脂であればフッ
素樹脂、ポリアセタール等であり、さらにステンレス等
の金属表面に摩擦係数の小さなフッ素樹脂加工等を施し
たものを使用することができる。このような摺動部材１
２ａ，１２ｂは、磁石可動体１０を移動自在に案内する
ガイド円筒体としてのボビン１の内周部に配置したとき
に、該ボビン１の内周面１ｅに直接接触しながら摺動す
る。On the other hand, the magnet movable body 10 is, for example, a perforated cylindrical rare earth permanent magnet 11 magnetized in the axial direction, and perforated disc-shaped sliding members 12 arranged at both ends of the permanent magnet 11.
a, 12b and the perforated disc-shaped cushion plate 13 arranged outside the disc-shaped sliding member 12a, the metal penetrating shaft body 14 is inserted into the engaging groove 15 of the metal penetrating shaft body 14. A stopper (metal E ring) 16 is fitted and locked, and the metal through shaft body 14 is fitted with a permanent magnet 11, a sliding member 12a,
12b and the cushion plate 13 are fixed. Here, the penetrating shaft body 14 is a non-magnetic or magnetic metal, the cushion plate 13 is an elastic material such as silicon rubber, and is sandwiched between the pair of stoppers 16 in a slightly compressed state. As a result, the cushion plate 13 has the permanent magnet 11 and the sliding member 12
It is possible to absorb the variation in the thicknesses of a and 12b and prevent rattling. The perforated disc-shaped sliding member 12a,
12b has an outer diameter larger than the outer diameter of the perforated columnar rare earth permanent magnet 11 and the cushion plate 13, and is formed of wear-resistant metal or resin having a small friction coefficient. For example, metal (either magnetic or non-magnetic) may be stainless steel or the like, and resin may be fluororesin, polyacetal or the like, and metal surface such as stainless steel may be treated with fluororesin having a small friction coefficient. It is possible to use the one that has been made. Such a sliding member 1
When arranged on the inner peripheral portion of the bobbin 1 serving as a guide cylinder for movably guiding the magnet movable body 10, the reference numerals 2a and 12b slide while directly contacting the inner peripheral surface 1e of the bobbin 1.
【００２５】なお、前記金属貫通軸体１４に永久磁石１
１や摺動部材１２ａ，１２ｂ等を一体化する際に接着剤
を併用してもよい。The permanent magnet 1 is attached to the metal through shaft 14.
An adhesive may be used together when the 1 and the sliding members 12a and 12b are integrated.
【００２６】前記磁石可動体１０をボビン１の内周部に
配置した状態で、ボビン１及び円筒状ヨーク５の外側に
断面コ字状保持枠体２０が固着されている。この保持枠
体２０の両側の折り曲げ部２０ａ，２０ｂは、前記ボビ
ン１の両端面に当接乃至圧接しており、前記金属貫通軸
体１４の端部が衝突するのを回避するために図３の如く
切り欠き（又は穴）２１が形成されている。そして、金
属貫通軸体１４の一方の端部は保持枠体２０の外部に出
力軸として延長している。この保持枠体２０の両側の折
り曲げ部２０ａ，２０ｂは、それぞれ磁石可動体１０の
端面（クッション板１３、摺動部材１２ｂ）に当接して
磁石可動体１０の移動範囲を規定するストッパとしても
機能する。この保持枠体２０は、非磁性でも磁性体であ
ってもよい。A holding frame body 20 having a U-shaped cross section is fixed to the outside of the bobbin 1 and the cylindrical yoke 5 in a state where the movable magnet body 10 is arranged on the inner peripheral portion of the bobbin 1. The bent portions 20a, 20b on both sides of the holding frame body 20 are in contact with or pressed against both end surfaces of the bobbin 1, and in order to avoid the end portion of the metal penetrating shaft body 14 from colliding, FIG. The notch (or hole) 21 is formed as shown in FIG. Then, one end of the metal penetrating shaft body 14 extends to the outside of the holding frame body 20 as an output shaft. The bent portions 20a and 20b on both sides of the holding frame body 20 also function as stoppers that come into contact with the end surfaces (cushion plate 13 and sliding member 12b) of the magnet movable body 10 to define the moving range of the magnet movable body 10. To do. The holding frame body 20 may be non-magnetic or magnetic.
【００２７】なお、前記２連の駆動コイル３ａ，３ｂの
うち、例えば駆動コイル３ａは永久磁石１１のＮ極を含
む端部を囲み、駆動コイル３ｂは、永久磁石１１のＳ極
を含む端部をそれぞれ囲むことができるように円環状に
巻回されており、かつ駆動コイル３ａに流れる電流の向
きと、コイル３ｂの電流の向きとは逆向きである（図１
の各コイルに付したＮ，Ｓを参照）。Of the two drive coils 3a and 3b, for example, the drive coil 3a surrounds the end of the permanent magnet 11 including the N pole, and the drive coil 3b includes the end of the permanent magnet 11 including the S pole. Are wound in an annular shape so that they can be respectively surrounded, and the direction of the current flowing through the drive coil 3a is opposite to the direction of the current flowing through the coil 3b (FIG. 1).
Refer to N and S attached to each coil of).
【００２８】この第１実施例では、２連の駆動コイル３
ａ，３ｂに電流を流すことにより、磁石可動体１０によ
る磁界と駆動コイル３ａ，３ｂの電流との相互作用で、
フレミングの左手の法則に基づく力に準ずる推力がその
磁石可動体１０に発生する。この推力は、図１の極性で
は、磁石可動体１０が右方向に移動する向きであり、各
コイルの電流を反転させれば磁石可動体１０の推力の向
きも反転する。なお、その際、軟磁性体円筒状ヨーク５
は駆動コイル３ａ，３ｂの電流の向きに直交する磁界成
分を増加させてフレミングの左手の法則に基づく力に準
ずる推力を大きくできる作用がある。また、強力な磁界
を発生可能な希土類磁石１１を用いたことも推力向上に
有効である。In this first embodiment, two drive coils 3 are connected in series.
By passing a current through a and 3b, the interaction between the magnetic field of the magnet movable body 10 and the current in the drive coils 3a and 3b causes
A thrust force corresponding to the force based on Fleming's left-hand rule is generated in the magnet movable body 10. In the polarity of FIG. 1, this thrust is the direction in which the magnet movable body 10 moves to the right, and if the current of each coil is reversed, the direction of the thrust of the magnet movable body 10 is also reversed. At that time, the soft magnetic material cylindrical yoke 5
Has the effect of increasing the magnetic field component orthogonal to the direction of the current in the drive coils 3a and 3b to increase the thrust force that is based on Fleming's left-hand rule. Further, the use of the rare earth magnet 11 capable of generating a strong magnetic field is also effective in improving thrust.
【００２９】また、前記保持枠体２０が非磁性の場合、
駆動コイル３ａ，３ｂに交流電流を流すことにより、一
定周期で振動を繰り返すバイブレータとして働く。If the holding frame 20 is non-magnetic,
By supplying an alternating current to the drive coils 3a and 3b, it works as a vibrator that repeats vibration at a constant cycle.
【００３０】この第１実施例によれば、次の通りの効果
を得ることができる。According to the first embodiment, the following effects can be obtained.
【００３１】(1) 穴あき円柱状希土類永久磁石１１よ
りも大きな外径の穴あき円板状摺動部材１２ａ，１２ｂ
が、ガイド円筒体を兼ねたボビン１の内周面１ｅに直接
接触しながら摺動するため、金属貫通軸体１４を摺動自
在に支持する軸受やこれを固定するための部材が不要と
なる。このため、部品点数が少なく、簡単な構造のリニ
アアクチュエータを実現できる。(1) Perforated cylindrical rare-earth permanent magnets 11 Perforated disc-shaped sliding members 12a, 12b having an outer diameter larger than that of the permanent magnet 11.
However, since it slides while directly contacting the inner peripheral surface 1e of the bobbin 1 which also serves as a guide cylinder, a bearing for slidably supporting the metal penetrating shaft body 14 and a member for fixing this are unnecessary. . Therefore, it is possible to realize a linear actuator having a simple structure with a small number of parts.
【００３２】(2) 金属貫通軸体１４の一方の端部であ
る出力軸以外は全てボビン１内に収まるため、全長が短
くなり、全ストローク移動時も出力軸と反対側に金属貫
通軸体１４が突出することがないため、省スペース化が
可能である。(2) The entire length of the metal penetrating shaft 14 except for the output shaft, which is one end of the metal penetrating shaft 14, is set within the bobbin 1. Therefore, the total length is shortened, and the metal penetrating shaft is provided on the side opposite to the output shaft even during the entire stroke movement. Since 14 does not project, it is possible to save space.
【００３３】(3) 前記ボビン１に検出コイル４を設け
たので、前記磁石可動体１０の移動に伴う誘起電圧を出
力でき、その誘起電圧から前記磁石可動体１０の移動速
度やその位置を検出することができる。なお、一対の駆
動コイル３ａ，３ｂは相互に逆向きに電流を流すため、
検出コイル４への影響は実質的に無い（無視できる）。(3) Since the bobbin 1 is provided with the detection coil 4, an induced voltage accompanying the movement of the magnet movable body 10 can be output, and the moving speed and position of the magnet movable body 10 can be detected from the induced voltage. can do. Since the pair of drive coils 3a and 3b flow currents in opposite directions,
There is substantially no influence on the detection coil 4 (which can be ignored).
【００３４】なお、上記第１実施例の構成において、断
面コ字状保持枠体２０を軟磁性体とすれば、駆動コイル
３ａ，３ｂの非通電時に両端部の折り曲げ部２０ａ，２
０ｂのいずれか一方に磁石可動体１０を吸着しておくこ
とができる。すなわち、折り曲げ部２０ａ，２０ｂを磁
性吸着体として機能させることができ、例えば、駆動コ
イル３ａ，３ｂに通電されていない状態では磁石可動体
１０はどちらかの折り曲げ部２０ａ，２０ｂに吸着保持
され、現在吸着している折り曲げ部２０ａ，２０ｂから
磁石可動体１０が離脱する向きに駆動コイル３ａ，３ｂ
で推力を発生させれば、反対側の折り曲げ部２０ａ，２
０ｂに磁石可動体１０が移動して吸着停止する。In the construction of the first embodiment, if the holding frame 20 having a U-shaped cross section is made of a soft magnetic material, the bent portions 20a, 2 at both ends when the drive coils 3a, 3b are not energized.
The magnet movable body 10 can be adsorbed to either one of 0b. That is, the bent portions 20a, 20b can be made to function as a magnetic attracting body. For example, when the drive coils 3a, 3b are not energized, the magnet movable body 10 is attracted and held by one of the bent portions 20a, 20b. The drive coils 3a and 3b are oriented in a direction in which the movable magnet body 10 is separated from the bent portions 20a and 20b that are currently attracted.
If a thrust is generated at, the bending portions 20a, 2 on the opposite side
The magnet movable body 10 moves to 0b and the attraction is stopped.
【００３５】図４は本発明の第２実施例を示す。この図
において、駆動コイル３ａ，３ｂ及び検出コイル４を巻
装した絶縁樹脂製の円筒状ボビン１の内周部にステンレ
ス等の非磁性金属製の円筒パイプ３０が固着されてお
り、この円筒パイプ３０の内側に磁石可動体１０が移動
自在に配置されている。その他の構成部分は前述した第
１実施例と同様であり、同一又は相当部分に同一符号を
付して説明を省略する。FIG. 4 shows a second embodiment of the present invention. In this figure, a cylindrical pipe 30 made of non-magnetic metal such as stainless steel is fixed to the inner peripheral portion of a cylindrical bobbin 1 made of insulating resin around which the drive coils 3a and 3b and the detection coil 4 are wound. Inside the magnet 30, the movable magnet body 10 is movably arranged. The other components are the same as those in the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals and description thereof will be omitted.
【００３６】この第２実施例の場合、非磁性金属の円筒
パイプ３０は、磁石可動体１０の摺動部材１２ａ，１２
ｂが直接接触してこれを摺動自在に案内する円筒状ガイ
ド部材として働き、円筒パイプ３０として摩擦係数の少
なく耐摩耗性の良好な材質を選ぶことで、長寿命化を図
ることができる。その他の作用効果は前述した第１実施
例と同様である。In the case of the second embodiment, the cylindrical pipe 30 made of non-magnetic metal is used as the sliding members 12a, 12 of the movable magnet body 10.
b serves as a cylindrical guide member that directly contacts and guides this slidably, and by selecting a material having a small friction coefficient and good wear resistance as the cylindrical pipe 30, it is possible to prolong the service life. Other functions and effects are similar to those of the first embodiment described above.
【００３７】図５は第１又は第２実施例で磁石可動体１
０の代わりに使用可能な磁石可動体の変形例である。こ
の場合の磁石可動体４０は、穴あき円柱状希土類永久磁
石１１と、円板状頭部付き貫通軸体４４と、ステンレス
等の非磁性金属製の円筒状摺動部材４２とからなってい
る。円板状頭部付き貫通軸体４４の円板状頭部４４ａ
は、希土類永久磁石１１と略同径である。そして磁石可
動体４０は、円板状頭部付き貫通軸体４４の軸部４４ｂ
を穴あき円柱状希土類永久磁石１１の貫通穴に挿通後、
円筒状摺動部材４２を希土類永久磁石１１及び円板状頭
部４４ａの外周に被せ、当該円筒状摺動部材４２の両端
部をかしめて（折り曲げて）相互に固定一体化すること
で組み立てられている。FIG. 5 shows a magnet movable body 1 according to the first or second embodiment.
It is a modification of the magnet movable body that can be used instead of 0. The magnet movable body 40 in this case is composed of a cylindrical rare earth metal permanent magnet 11 with a hole, a through shaft 44 with a disk-shaped head, and a cylindrical sliding member 42 made of nonmagnetic metal such as stainless steel. . Disk-shaped head 44a of penetrating shaft body 44 with disk-shaped head
Has approximately the same diameter as the rare earth permanent magnet 11. The magnet movable body 40 includes the shaft portion 44b of the through shaft member 44 with a disk-shaped head.
After inserting into the through hole of the perforated cylindrical rare earth permanent magnet 11,
The cylindrical sliding member 42 is assembled by covering the rare earth permanent magnet 11 and the outer circumference of the disk-shaped head 44a, and crimping (bending) both ends of the cylindrical sliding member 42 to fix and integrate each other. ing.
【００３８】この図５の磁石可動体４０の最大径部は円
筒状摺動部材４２であり、これがボビンの内周部又はボ
ビン内周の非磁性パイプの内側に直接接して円滑に摺動
できる。また円板状頭部付き貫通軸体４４は、樹脂等で
簡単に形成でき、このような円板状頭部付き貫通軸体４
４を用いることで磁石可動体４０の部品点数が希土類永
久磁石１１、貫通軸体４４及び摺動部材４２の３点に削
減でき、構造の簡略化を図るとともに組立容易とするこ
とができる。The maximum diameter portion of the magnet movable body 40 in FIG. 5 is a cylindrical sliding member 42, which directly contacts the inner peripheral portion of the bobbin or the inner side of the non-magnetic pipe on the inner peripheral surface of the bobbin for smooth sliding. . Further, the disk-shaped headed through shaft body 44 can be easily formed of resin or the like.
By using 4, the number of parts of the magnet movable body 40 can be reduced to three points of the rare earth permanent magnet 11, the penetrating shaft body 44, and the sliding member 42, and the structure can be simplified and the assembly can be facilitated.
【００３９】図６は第１又は第２実施例で磁石可動体１
０の代わりに使用可能な磁石可動体の他の変形例であ
る。この場合の磁石可動体５０は、穴あき円柱状希土類
永久磁石１１と、頭部付き貫通軸体５４と、頭部付き貫
通軸体５４の頭部５４ａが嵌まる凹部５５ａを持つ樹脂
製等の円板状押さえ部材５５と、ステンレス等の非磁性
金属製の円筒状摺動部材４２とからなっている。円板状
押さえ部材５５は、希土類永久磁石１１と略同径であ
る。この磁石可動体５０は、頭部付き貫通軸体５４の軸
部５４ｂを穴あき円柱状希土類永久磁石１１の貫通穴に
挿通後、円板状押さえ部材５５を頭部５４ａに被せ、さ
らに円筒状摺動部材４２を希土類永久磁石１１及び円板
状押さえ部材５５の外周に被せ、当該円筒状摺動部材４
２の両端部をかしめて相互に固定一体化することにより
組み立てられる。FIG. 6 shows a magnet movable body 1 according to the first or second embodiment.
It is another modification of the magnet movable body which can be used instead of 0. The magnet movable body 50 in this case is made of resin or the like having a cylindrical rare earth element permanent magnet 11 with a hole, a through shaft 54 with a head, and a recess 55a into which the head 54a of the through shaft 54 with a head fits. The disc-shaped pressing member 55 and the cylindrical sliding member 42 made of non-magnetic metal such as stainless steel are included. The disk-shaped pressing member 55 has substantially the same diameter as the rare earth permanent magnet 11. In this magnet movable body 50, the shaft portion 54b of the through shaft 54 with a head is inserted into the through hole of the columnar rare earth permanent magnet 11 with a hole, and then the disk-shaped pressing member 55 is covered on the head 54a to form a cylindrical shape. The sliding member 42 is placed on the outer circumferences of the rare earth permanent magnet 11 and the disc-shaped pressing member 55, and the cylindrical sliding member 4
It is assembled by caulking both ends of 2 and fixing and integrating with each other.
【００４０】この図６の磁石可動体５０の最大径部は円
筒状摺動部材４２であり、これがボビンの内周部又はボ
ビン内周の非磁性パイプの内側に直接接して円滑に摺動
できる。また、樹脂製等の円板状押さえ部材５５を用い
たことで、頭部付き貫通軸体５４の頭部５４ａは、比較
的小径でもよく、頭部付き貫通軸体５４を金属等で容易
に作製することができる。また、図５に比べると部品点
数が１つ増えるが、やはり、部品点数が少なく、構造が
簡単で、組立容易であるといえる。The maximum diameter portion of the magnet movable body 50 in FIG. 6 is a cylindrical sliding member 42, which directly contacts the inner peripheral portion of the bobbin or the inner side of the non-magnetic pipe on the inner peripheral surface of the bobbin for smooth sliding. . Further, by using the disc-shaped pressing member 55 made of resin or the like, the head portion 54a of the headed through shaft body 54 may have a relatively small diameter, and the headed through shaft body 54 can be easily made of metal or the like. Can be made. Although the number of parts is increased by one as compared with FIG. 5, it can be said that the number of parts is small, the structure is simple, and the assembly is easy.
【００４１】なお、図１、図４、図５及び図６に示した
磁石可動体の希土類永久磁石１１の少なくとも外周面を
含む表面に金属又は樹脂のコーティング層を設けておく
ことが希土類永久磁石１１の寿命や劣化を防止して信頼
性を高める上で望ましい。以上本発明の実施例について
説明してきたが、本発明はこれに限定されることなく請
求項の記載の範囲内において各種の変形、変更が可能な
ことは当業者には自明であろう。The rare earth permanent magnet is preferably provided with a metal or resin coating layer on the surface including at least the outer peripheral surface of the rare earth permanent magnet 11 of the magnet movable body shown in FIGS. 1, 4, 5, and 6. It is desirable to prevent the life and deterioration of the No. 11 and to improve the reliability. Although the embodiment of the present invention has been described above, it will be apparent to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims.
【００４２】[0042]
【発明の効果】以上説明したように、本発明の可動磁石
式アクチュエータによれば、希土類永久磁石の端部又は
外周の少なくとも一部分に摺動部材を一体化し、かつ当
該摺動部材が最大径部となるように磁石可動体を構成
し、駆動コイルを配置したボビンの内側に前記磁石可動
体を移動自在に設けたので、前記摺動部材が、ボビン内
周側を摺動するため、従来構造で必要であった貫通軸体
を摺動自在に支持する軸受やこれを固定するための部材
が不要となり、部品点数の削減及び構造の簡略化を図る
ことができ、さらには組立容易とすることができる。ま
た、出力軸以外は全てボビン内に収まるため、全長が短
くなり、全ストローク移動時も出力軸と反対側に突出す
る軸体がないため、省スペース化が可能である。As described above, according to the movable magnet type actuator of the present invention, the sliding member is integrated with at least a part of the end portion or the outer circumference of the rare earth permanent magnet, and the sliding member has the maximum diameter portion. Since the magnet movable body is configured so as to be movable and the magnet movable body is movably provided inside the bobbin in which the drive coil is arranged, the sliding member slides on the inner peripheral side of the bobbin. The bearing for slidably supporting the through shaft and the member for fixing it, which were required in the above, are no longer required, so the number of parts can be reduced, the structure can be simplified, and the assembly is easy. You can Further, since all but the output shaft are accommodated in the bobbin, the total length is shortened, and there is no shaft body projecting to the side opposite to the output shaft even during the entire stroke movement, so that space can be saved.
【図１】本発明に係る可動磁石式アクチュエータの第１
実施例を示す正断面図である。FIG. 1 is a first part of a movable magnet type actuator according to the present invention.
It is a right sectional view showing an example.
【図２】同正面図である。FIG. 2 is a front view of the same.
【図３】同側面図である。FIG. 3 is a side view of the same.
【図４】本発明の第２実施例を示す正断面図である。FIG. 4 is a front sectional view showing a second embodiment of the present invention.
【図５】本発明において使用可能な磁石可動体の変形例
を示す正断面図である。FIG. 5 is a front sectional view showing a modified example of a movable magnet body usable in the present invention.
【図６】本発明において使用可能な磁石可動体の他の変
形例を示す正断面図である。FIG. 6 is a front cross-sectional view showing another modification of the movable magnet body that can be used in the present invention.
１ ボビン ２ａ，２ｂ，２ｃ，２ｄ 端子ピン ３ａ，３ｂ 駆動コイル ４ 検出コイル ５ 円筒状ヨーク １０，４０，５０ 磁石可動体 １１ 希土類永久磁石 １２ａ，１２ｂ，４２ 摺動部材 １３ クッシヨン板 １４，４４，５４ 貫通軸体 １６ 止め具 ２０ 保持枠体 ３０ 円筒パイプ ５５ 円板状押え部材 1 bobbin 2a, 2b, 2c, 2d terminal pin 3a, 3b drive coil 4 detection coil 5 cylindrical yoke 10, 40, 50 magnet movable body 11 rare earth permanent magnets 12a, 12b, 42 sliding member 13 cushion plate 14, 44, 54 Penetration shaft body 16 Stopper 20 Holding frame body 30 Cylindrical pipe 55 Disc-shaped pressing member
Claims (7)
とも一部分に摺動部材を一体化し、かつ当該摺動部材が
最大径部となるように磁石可動体を構成し、駆動コイル
を配置したボビンの内側に前記磁石可動体を移動自在に
設けたことを特徴とする可動磁石式アクチュエータ。1. A bobbin in which a sliding member is integrated with at least a part of an end portion or an outer periphery of a rare earth permanent magnet, and a movable magnet body is configured so that the sliding member has a maximum diameter portion, and a drive coil is arranged. A movable magnet type actuator, characterized in that the movable magnet body is movably provided inside.
し、該非磁性パイプの内側に前記磁石可動体を移動自在
に設けた請求項１記載の可動磁石式アクチュエータ。2. The movable magnet type actuator according to claim 1, wherein a non-magnetic pipe is arranged on the inner circumference of the bobbin, and the movable magnet body is movably provided inside the non-magnetic pipe.
なくとも前記希土類永久磁石が穴あき構造であり、前記
希土類永久磁石を貫通する貫通軸体に前記希土類永久磁
石を固定して前記磁石可動体を構成した請求項１又は２
記載の可動磁石式アクチュエータ。3. The magnet movable body, wherein at least the rare earth permanent magnet of the rare earth permanent magnet and the sliding member has a holed structure, and the rare earth permanent magnet is fixed to a penetrating shaft that penetrates the rare earth permanent magnet. Claim 1 or 2 which constituted
The movable magnet type actuator described.
とも前記希土類永久磁石を当該貫通軸体に固定した請求
項３記載の可動磁石式アクチュエータ。4. The movable magnet type actuator according to claim 3, wherein at least the rare earth permanent magnet is fixed to the through shaft by a retaining ring that engages with the through shaft.
外周に前記摺動部材を被せて一体化したものである請求
項１又は２記載の可動磁石式アクチュエータ。5. The movable magnet type actuator according to claim 1 or 2, wherein the movable magnet body is formed by covering the outer circumference of the rare earth permanent magnet with the sliding member so as to be integrated therewith.
を金属又は樹脂でコーティングした請求項１，２，３，
４又は５記載の可動磁石式アクチュエータ。6. The rare earth permanent magnet having at least an outer peripheral portion coated with a metal or a resin.
4. The movable magnet type actuator according to 4 or 5.
１，２，３，４，５又は６記載の可動磁石式アクチュエ
ータ。7. The movable magnet type actuator according to claim 1, wherein the bobbin is provided with a detection coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07996194A JP3348124B2 (en) | 1994-03-25 | 1994-03-25 | Moving magnet type actuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07996194A JP3348124B2 (en) | 1994-03-25 | 1994-03-25 | Moving magnet type actuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07274468A true JPH07274468A (en) | 1995-10-20 |
| JP3348124B2 JP3348124B2 (en) | 2002-11-20 |
Family
ID=13704911
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07996194A Expired - Fee Related JP3348124B2 (en) | 1994-03-25 | 1994-03-25 | Moving magnet type actuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3348124B2 (en) |
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| JP2007123470A (en) * | 2005-10-27 | 2007-05-17 | Fujitsu Component Ltd | Solenoid actuator and biaxial actuator |
| US7665510B2 (en) | 2003-02-28 | 2010-02-23 | Denso Corporation | Fluid drive unit and heat transport system |
| JP2011203074A (en) * | 2010-03-25 | 2011-10-13 | Yamaha Corp | Apparatus for detecting displacement position of electromagnetic actuator |
| WO2011136259A1 (en) * | 2010-04-28 | 2011-11-03 | 日本電産サンキョー株式会社 | Method for controllably driving positive-displacement pump, and positive-displacement pump |
| WO2011145359A1 (en) * | 2010-05-20 | 2011-11-24 | 株式会社コガネイ | Linear motor |
| JP2011247249A (en) * | 2010-04-28 | 2011-12-08 | Nidec Sankyo Corp | Positive-displacement pump |
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1994
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| JP2011247249A (en) * | 2010-04-28 | 2011-12-08 | Nidec Sankyo Corp | Positive-displacement pump |
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