JP2937709B2 - Electromagnetic drive - Google Patents
Electromagnetic driveInfo
- Publication number
- JP2937709B2 JP2937709B2 JP25699593A JP25699593A JP2937709B2 JP 2937709 B2 JP2937709 B2 JP 2937709B2 JP 25699593 A JP25699593 A JP 25699593A JP 25699593 A JP25699593 A JP 25699593A JP 2937709 B2 JP2937709 B2 JP 2937709B2
- Authority
- JP
- Japan
- Prior art keywords
- coil
- yoke
- inner diameter
- bobbinless
- electromagnetic drive
- 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.)
- Expired - Fee Related
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Description
【０００１】[0001]
【産業上の利用分野】本発明はコイルとヨークとを有す
る電磁駆動装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electromagnetic drive having a coil and a yoke.
【０００２】[0002]
【従来の技術】コイルと該コイルに対して相対移動する
ヨークとを有する電磁駆動装置においては、該コイルが
樹脂製のボビンに嵌装されたボビン付きコイルとして構
成されているものが一般的である。ボビンがあると、該
コイル内にヨークを挿入する時に該ヨークとコイル素線
との摺接が起こらないため該素線の絶縁被覆が剥される
恐れがない上、該電磁駆動装置を他の部材に取付ける時
に該ボビンを位置決め部材としても利用できる、という
利点がある。2. Description of the Related Art In an electromagnetic drive device having a coil and a yoke which moves relatively to the coil, it is general that the coil is configured as a coil with a bobbin fitted on a resin bobbin. is there. With the bobbin, when the yoke is inserted into the coil, the sliding contact between the yoke and the coil wire does not occur, so that there is no danger that the insulating coating of the wire will be peeled off. There is an advantage that the bobbin can be used also as a positioning member when attached to a member.
【０００３】しかしながら、ボビン付きコイルの場合、
ボビンを要するためにコストが高くなり、また、ボビン
があるためにコイルの外径（電磁駆動装置の外径）が大
きくなって該装置の小型化を妨げる、という欠点もあ
る。However, in the case of a coil with a bobbin,
There is also a disadvantage that the cost is increased due to the necessity of the bobbin, and the outer diameter of the coil (the outer diameter of the electromagnetic drive device) is increased due to the presence of the bobbin, which hinders miniaturization of the device.
【０００４】そこで、最近では、ボビンを使用しないボ
ビンレスコイルを電磁駆動装置のコイルとして使用する
ようになってきているが、ボビンレスコイルを使用する
電磁駆動装置ではヨークを該コイル内に挿入する時の該
ヨークとコイル素線との擦過を防止するために、図８に
示すようにヨーク４２の外周に非導電性材料から成る熱
収縮チューブ４３を被覆していた。図９において、４１
はボビンレスコイルであり、該コイル４１にはコイル巻
線機の巻芯から該コイルを抜き出すための抜きテーパー
が設けられているので該コイル４１には大径部と小径部
とがある。Therefore, recently, a bobbin-less coil that does not use a bobbin has been used as a coil of an electromagnetic drive device. In an electromagnetic drive device that uses a bobbin-less coil, a yoke is inserted into the coil. In order to prevent friction between the yoke and the coil wire at the time, a heat-shrinkable tube 43 made of a non-conductive material is coated on the outer periphery of the yoke 42 as shown in FIG. In FIG. 9, 41
Is a bobbinless coil, and the coil 41 has a large diameter portion and a small diameter portion because a taper for extracting the coil from the core of the coil winding machine is provided in the coil 41.
【０００５】[0005]
【発明が解決しようとする課題】前述のように、コイル
としてボビンレスコイルを使用するとともにヨークの外
周を熱収縮チューブで被覆した構成の従来の電磁駆動装
置では、次のような理由のため、ボビンレスコイルを使
用したことによる小型化効果が少ない、という問題点が
あった。すなわち、ヨークの外周を該チューブで被覆す
る場合、該チューブの収縮前には該チューブの厚さは約
０．０５ｍｍであるが、熱収縮後は約０．１５ｍｍとな
って厚みが増してしまうため、ヨークの外径は該チュー
ブを被覆しない状態に比べて０．３ｍｍも増大してしま
い、しかも、該ヨークの外径の増大に対応して該コイル
の内径も増大させる必要があるため、結果的にはボビン
付きコイルを使用して構成された電磁駆動装置に比べて
顕著な小型化効果は望めない。しかも、該ヨークを該ボ
ビンレスコイルに挿入する時には該ヨークの外周を被覆
している該チューブが該コイルの内径部の全長に渡って
摺接且つ擦過するため、駆動力発生に大きく寄与する部
分のコイル素線の絶縁被覆が破壊される可能性が高く、
従って、ボビンレスコイルを使用した従来の電磁駆動装
置では、駆動力が著るしく小さい不良品の発生率も高
く、その結果、コストもボビン付きコイル使用の装置に
比べて顕著に安価なものとはならなかった。As described above, in a conventional electromagnetic drive device in which a bobbinless coil is used as a coil and the outer periphery of the yoke is covered with a heat-shrinkable tube, for the following reasons, There is a problem that the use of the bobbinless coil has a small effect of miniaturization. That is, when the outer periphery of the yoke is covered with the tube, the thickness of the tube is about 0.05 mm before the tube shrinks, but becomes about 0.15 mm after the heat shrinkage, and the thickness increases. Therefore, the outer diameter of the yoke is increased by 0.3 mm as compared with a state where the tube is not covered, and the inner diameter of the coil needs to be increased in accordance with the increase in the outer diameter of the yoke. As a result, a remarkable size reduction effect cannot be expected as compared with an electromagnetic drive device configured using a coil with a bobbin. Moreover, when the yoke is inserted into the bobbinless coil, the tube covering the outer periphery of the yoke slides and rubs over the entire length of the inner diameter portion of the coil, so that a portion that greatly contributes to driving force generation There is a high possibility that the insulation coating of the coil strand will be destroyed,
Therefore, in the conventional electromagnetic drive device using the bobbin-less coil, the driving force is remarkable, the occurrence rate of small defective products is high, and as a result, the cost is remarkably lower than that of the device using the coil with the bobbin. Did not become.
【０００６】本発明の目的は前述した従来技術の問題点
を解決し、ボビン付きコイルを使用する従来の電磁駆動
装置に比べて明らかな小型化効果とコスト低減効果を実
現できる、改善された電磁駆動装置を提供することであ
る。SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art, and to provide an improved electromagnetic device capable of realizing a clear miniaturization effect and cost reduction effect as compared with a conventional electromagnetic drive device using a coil with a bobbin. It is to provide a driving device.
【０００７】[0007]
【課題を解決するための手段】該電磁駆動装置の小径化
を図るためには、ヨークの大径化を招く熱収縮チューブ
被覆部分をできるだけ減らし、ヨークをボビンレスコイ
ル中に挿入する時に該ヨークと該コイル内径部との擦過
によって生じるコイル素線の絶縁被覆破壊の可能性のあ
る部分（コイル素線の短絡の可能性のある部分）を駆動
力発生の小さい部分のみに設け、ヨークの大部分には熱
収縮チューブ等を被覆せずに該ヨークの外周と該コイル
の内径部との間に適切なクリアランスを設けておくこと
により該電磁駆動装置の小径化を実現でき、ボビンレス
コイルを使用したことによる効果を顕著なものとするこ
とができる。In order to reduce the diameter of the electromagnetic drive device, the portion of the heat shrinkable tube that causes the diameter of the yoke to be increased is reduced as much as possible, and the yoke is inserted when the yoke is inserted into the bobbinless coil. A portion where the insulation of the coil wire may be broken (a portion where the coil wire may be short-circuited) due to friction between the coil yoke and the inner diameter portion of the coil is provided only in a portion where the driving force is small and the yoke is large. By providing an appropriate clearance between the outer periphery of the yoke and the inner diameter of the coil without covering the portion with a heat shrink tube or the like, it is possible to reduce the diameter of the electromagnetic drive device, and realize a bobbinless coil. The effect of the use can be remarkable.
【０００８】本出願に係る発明の目的を実現する構成
は、ボビンレスコイルと、該コイルの内径部に挿入され
るヨークと、を有する電磁駆動装置において、前記コイ
ルは、第一の端面部近傍に位置する第一内径部と、該第
一内径部とは軸方向に離れた第二の端面部近傍に位置す
る第二内径部とを有し、該第一内径部よりも該第二内径
部の方が内径が大であり、該第二内径部と該ヨークとの
間には非動電部材が介在されているようにしたものであ
る。[0008] A configuration for realizing the object of the invention according to the present application.
Is inserted into the bobbin-less coil and the inner diameter of the coil.
And a yoke,
A first inner diameter portion located near the first end face portion;
Located near the second end face that is axially separated from the inner diameter
A second inner diameter portion, the second inner diameter portion being larger than the first inner diameter portion.
Part has a larger inner diameter, and the second inner diameter part and the yoke
A non-electrodynamic member is interposed between them.
You .
【０００９】[0009]
【実施例】以下に本発明の実施例を説明する。Embodiments of the present invention will be described below.
【００１０】〈実施例１〉図１に本発明の第１の実施例
の長さ方向の断面模式図を示す。同図において、１はボ
ビンレスコイルで、巻き始め部１ａの端面の内径の寸法
ｒ1 に比べて巻き終わり部１ｂ端面の内径の寸法ｒ2 の
方が大きくなっている。２はヨークで、ボビンレスコイ
ル１に通電することによって発生する磁束を多くさせか
つ磁束を伝える役割をしている。３は非導電部材で、従
来からあるような熱収縮チューブでもよい。<Embodiment 1> FIG. 1 is a schematic cross-sectional view in the longitudinal direction of a first embodiment of the present invention. In the figure, 1 is a bobbin-less coil, towards the winding start portion 1a of the end face of the inner diameter dimension r winding end portion 1b end face of the inner diameter dimension r 2 compared to 1 is increased. Numeral 2 denotes a yoke that increases the magnetic flux generated when the bobbinless coil 1 is energized and transmits the magnetic flux. Reference numeral 3 denotes a non-conductive member, which may be a conventional heat-shrinkable tube.
【００１１】図２に非導電部材を用いない場合のボビン
レスコイルとヨークの長さ方向の断面模式図を示し、図
１及び図２を用いて、本実施例の効果を以下に説明す
る。FIG. 2 is a schematic cross-sectional view of the bobbin-less coil and the yoke in the longitudinal direction when no non-conductive member is used. The effects of the present embodiment will be described below with reference to FIGS.
【００１２】図２に示すように非導電部材３をボビンレ
スコイル１とヨーク２の間に介在させない場合はボビン
レスコイル１の素線が短絡する可能性は場所Ａ〜Ｚまで
どこでも等しい。仮に場所Ａと場所Ｚで素線が短絡した
とすると、通常ヨーク２は鉄材なので、ボビンレスコイ
ル１に通電すると電流が場所Ａから直接、場所Ｚに流れ
てしまう。この時、一層目のコイルには実質上電流が流
れていないことになるので、一層分の磁気エネルギーを
損失する結果となる。As shown in FIG. 2, when the non-conductive member 3 is not interposed between the bobbinless coil 1 and the yoke 2, the possibility of short-circuiting of the wire of the bobbinless coil 1 is equal everywhere from A to Z. If the element wires are short-circuited at the location A and the location Z, the current flows from the location A directly to the location Z when the bobbin-less coil 1 is energized because the yoke 2 is usually made of an iron material. At this time, since substantially no current flows through the first coil, the magnetic energy of the first layer is lost.
【００１３】ところが図１に示したようにボビンレスコ
イル１とヨーク２の間の大径部のみに非導電部材３を介
在させた場合、巻き終わり部１ｂの端面近傍の一層目の
コイルは、非導電部材３によって絶縁されているので、
上述のようなことは起こらない。また、非導電部材３に
よってボビンレスコイル１はヨーク２と略平行に設置さ
れるので、ボビンレスコイル１の素線が短絡する可能性
のある箇所は限られており、（例えば図１の場所Ａ〜Ｃ
まで）、仮にその両端（つまり場所Ａと場所Ｃ）で短絡
したとしても、従来に比べて磁気的エネルギー損失を大
幅に小さくすることができる。すなわち、発生駆動力が
著るしく小さい不良品の発生を抑えることができる。However, as shown in FIG. 1, when the nonconductive member 3 is interposed only in the large diameter portion between the bobbinless coil 1 and the yoke 2, the first coil near the end face of the winding end portion 1b is Since it is insulated by the non-conductive member 3,
The above does not happen. In addition, since the bobbinless coil 1 is installed substantially parallel to the yoke 2 by the non-conductive member 3, the locations where the wires of the bobbinless coil 1 are likely to be short-circuited are limited. AC
Up to this point, even if short-circuits occur at both ends (that is, at the location A and the location C), the magnetic energy loss can be significantly reduced as compared with the related art. That is, it is possible to suppress the occurrence of defective products having a remarkably small driving force.
【００１４】また、図８に示す従来例では大径部と小径
部に非導電部材４３を介在させるのに対して本実施例で
は大径部のみに非導電部材３を介在させることで、２個
必要だったものを１個にすることができるのでコストダ
ウンとなる。In the conventional example shown in FIG. 8, the non-conductive member 43 is interposed between the large-diameter portion and the small-diameter portion, whereas in the present embodiment, the non-conductive member 3 is interposed only in the large-diameter portion. The cost can be reduced because the required number can be reduced to one.
【００１５】また、図８に示す従来品では非導電部材４
３があるために小径部のスペースにコイル素線を巻けな
かった空間が存在していたが、本実施例では、その空間
にもコイルが巻けるようになったので、スペース効率が
向上するとともに駆動力が大きくなるので、単位出力当
りの小型化が顕著となる。Further, in the conventional product shown in FIG.
3, there was a space in which the coil wire could not be wound in the space of the small diameter portion. However, in this embodiment, the coil can be wound in that space as well, so that the space efficiency is improved and the drive is improved. Since the power becomes large, the size reduction per unit output becomes remarkable.
【００１６】なお、ボビンレスコイルの内径の形状は円
形でも角形でもよく、コイルの穴形状にかかわらず同じ
効果が期待できることは言うまでもない。The shape of the inner diameter of the bobbinless coil may be circular or square, and it goes without saying that the same effect can be expected regardless of the shape of the coil hole.
【００１７】〈実施例２〉図３に本発明の第２の実施例
を示す。<Embodiment 2> FIG. 3 shows a second embodiment of the present invention.
【００１８】同図において、１１はボビンレスコイル
で、巻き始め部１１ａと巻き終わり部１１ｂとの間に段
部１１ｃが設けられている。巻き始め部１１ａと段部１
１ｃの間の区間Ｌ1 では一層あたり５ターンほどのコイ
ルが２ｎ層分（ｎは自然数）形成されており、その次の
（２ｎ＋１）層目からは一層当たり該コイル１の長さＬ
分だけのターン数となって、所定ターン数まで素線が巻
かれている。In FIG. 1, reference numeral 11 denotes a bobbinless coil, and a step portion 11c is provided between a winding start portion 11a and a winding end portion 11b. Winding start part 11a and step part 1
Coil 2n layer content of about interval L 1 in 5 turns per layer between 1c (n is a natural number) is formed, the next (2n + 1) the length of the coil 1 per layer from th layer L
The number of turns is equal to the number of turns, and the strand is wound up to the predetermined number of turns.
【００１９】区間Ｌ1 の役割は磁気的なものはほとんど
なく、磁気的エネルギーロスを少なくすることにある。The role of the section L 1 is magnetically ones little is to reduce the magnetic energy loss.
【００２０】１２はヨークで、ボビンレスコイル１１の
段部１１ｃと対応するようにヨーク１２にも端面１２
ａ，１２ｂの間に段部１２ｃが設けられている。ボビン
レスコイル１１とヨーク１２の寸法関係は、該コイル１
１の巻き始め部１１ａ端面の内径寸法Ｄ1 、巻き終わり
部１１ｂ端面の内径寸法Ｄ2 、該コイル１１の巻き始め
部１１ａ端面の内径に対応するヨーク１２の寸法をｄ1
該コイル１１の巻き終わり部１１ｂ端面の内径に対応す
るヨーク１２の寸法をｄ2 とすると、例えばｄ1 ≒Ｄ1
＋０．１（ｍｍ）、ｄ2 ≒Ｄ2 ＋０．２（ｍｍ）となっ
ている。すなり、区間Ｌ1 の一層目のコイルはヨーク１
２の挿入時に短絡する可能性が他の区間よりも高くな
る。しかし、この区間Ｌ1 の両端で短絡したとしても、
該コイル１１に通電した時の磁気的エネルギーロスは前
出の５ターン分のみであって従来のボビンレスコイル使
用の装置に比べてロスを小さくできることは明らかであ
る。Reference numeral 12 denotes a yoke, and the yoke 12 has an end surface 12 corresponding to the step 11c of the bobbinless coil 11.
A step 12c is provided between a and 12b. The dimensional relationship between the bobbinless coil 11 and the yoke 12
The dimensions of the yoke 12 corresponding to the inner diameter D 1 of the end surface of the winding start portion 11a, the inner diameter D 2 of the end surface of the winding end portion 11b, and the inner diameter of the end surface of the winding start portion 11a of the coil 11 are represented by d 1.
Assuming that the dimension of the yoke 12 corresponding to the inner diameter of the end face of the winding end portion 11b of the coil 11 is d 2 , for example, d 1 ≒ D 1
+0.1 (mm) and d 2 ≒ D 2 +0.2 (mm). In other words, the first coil of the section L1 is the yoke 1
The possibility of a short circuit when inserting 2 is higher than in other sections. However, even if a short circuit at both ends of the segment L 1,
The magnetic energy loss when the coil 11 is energized is only for the above-mentioned five turns, and it is clear that the loss can be reduced as compared with a conventional device using a bobbinless coil.
【００２１】よって、本実施例のように、ボビンレスコ
イルの内部に段部を設けても第１実施例と同様の効果が
得られる。Therefore, even if a step is provided inside the bobbinless coil as in the present embodiment, the same effect as in the first embodiment can be obtained.
【００２２】また、第１実施例のようにボビンレスコイ
ル１１の巻き終わり部１１ｂとヨーク１２の間に非導電
部材を介在させて、ボビンレスコイル１１の出来上がり
によって巻き終わり部１１ｂで短絡するのを完全に防止
すれば、効果が確実に得られることは言うまでもない。Further, as in the first embodiment, a non-conductive member is interposed between the winding end portion 11b of the bobbinless coil 11 and the yoke 12, and short-circuiting occurs at the winding end portion 11b due to the completion of the bobbinless coil 11. It is needless to say that the effect can be surely obtained by completely preventing.
【００２３】〈実施例３〉図４に本発明の第３の実施例
を示す。<Embodiment 3> FIG. 4 shows a third embodiment of the present invention.
【００２４】同図は、長さ方向の断面模式図であり、２
１はボビンレスコイル、２２はヨーク、である。FIG. 3 is a schematic cross-sectional view in the length direction.
1 is a bobbinless coil, 22 is a yoke.
【００２５】ボビンレスコイル２１の内径部の形状はそ
の少なくとも一部が両端を結ぶ直線よりもヨーク２２側
へ凸形状となっている。すなわち、本実施例のボビンレ
スコイル２１は鼓（つづみ）形の外形を有しており、該
コイル２１の内径は以下のように設計されている。すな
わち、第１の端面部の内径寸法をＤ1 、第２の端面部の
内径寸法をＤ2 、ボビンレスコイル２１の軸方向の長さ
をＬ、第１及び第２の端面部の間にある第１の端面部か
ら軸方向距離がＸの点での内径寸法をＤとすると、Ｄは
次式で表わされる。The shape of the inner diameter of the bobbinless coil 21 is at least partly convex toward the yoke 22 from a straight line connecting both ends. That is, the bobbinless coil 21 of this embodiment has a drum-shaped (consecutive) outer shape, and the inner diameter of the coil 21 is designed as follows. That is, the inside diameter of the first end face is D 1 , the inside diameter of the second end face is D 2 , the axial length of the bobbinless coil 21 is L, and the distance between the first and second end faces is L. Assuming that the inner diameter at a point where the axial distance is X from a certain first end portion is D, D is represented by the following equation.
【００２６】Ｄ＜Ｄ1 ＋（Ｄ2 −Ｄ1 ）／Ｌ 上記構成の場合、ボビンレスコイル２１にヨーク２２を
挿入した時、短絡する可能性があるのは該コイルの最小
内径部の場所Ａ〜Ｅであり、仮りにこの場所の両端で短
絡したとしても数ターン分の磁気エネルギー損失となる
だけなので、電磁駆動装置の駆動力が著るしく小さくな
る恐れはなく、駆動力が著るしく小さい不良品の生ずる
危険性は全くない。D <D 1 + (D 2 −D 1 ) / L In the above configuration, when the yoke 22 is inserted into the bobbin-less coil 21, there is a possibility that a short circuit occurs at the location of the minimum inner diameter portion of the coil. A to E, and even if a short circuit occurs at both ends of this location, only a few turns of magnetic energy are lost. Therefore, the driving force of the electromagnetic drive device does not significantly decrease, and the driving force is significant. There is no danger of small and defective products.
【００２７】また、ボビンレスコイル２１とヨーク２２
との間に非導電部材を介在させなくても良いので、コス
トダウンとなる。The bobbinless coil 21 and the yoke 22
It is not necessary to intervene a non-conductive member between the first and second members, thereby reducing the cost.
【００２８】なお、本実施例のボビンレスコイルは両端
の直径が大きくて中央部の直径が小さい鼓形であるが、
図５及び図６のように一端側の直径が最大で他端側の直
径が最小となるラッパ形の形状であってもよい。この例
ではボビンレスコイル２１の巻き始め部２１ａの近傍も
しくは巻き終わり部２１ｂの近傍でボビンレスコイル２
１とヨーク２２を接触させても磁気的エネルギー損失は
前述のように小さいので、組立ての自由度を向上させる
ことが可能となる。また、著るしく駆動力の小さな不良
品の発生も非常に少なくなるため、製造コストも安価に
なる。The bobbinless coil of this embodiment has a drum shape with a large diameter at both ends and a small diameter at the center.
As shown in FIGS. 5 and 6, a trumpet shape may be adopted in which the diameter at one end is maximum and the diameter at the other end is minimum. In this example, the bobbinless coil 2 is disposed near the winding start portion 21a or near the winding end portion 21b of the bobbinless coil 21.
Since the magnetic energy loss is small even if the yoke 22 is brought into contact with the yoke 22, the degree of freedom in assembly can be improved. In addition, the occurrence of remarkably small defective products having a small driving force is extremely reduced, so that the manufacturing cost is reduced.
【００２９】〈実施例４〉図７に本発明の第４の実施例
を示す。<Embodiment 4> FIG. 7 shows a fourth embodiment of the present invention.
【００３０】図７は長さ方向の断面模式図であり、同図
において３１はボビンレスコイル、３２はヨーク、であ
る。本実施例では、該コイル３１は全長に渡って外径及
び内径が一定な円筒体であるが、ヨーク３２はクラウン
形状（ｃｒｏｗｎ）もしくはバレル形の外形形状に構成
されて両端で最小径となり、中央で最大径となってい
る。FIG. 7 is a schematic cross-sectional view in the length direction. In FIG. 7, reference numeral 31 denotes a bobbinless coil, and 32 denotes a yoke. In this embodiment, the coil 31 is a cylindrical body having a constant outer diameter and inner diameter over the entire length, but the yoke 32 is formed in a crown-shaped or barrel-shaped outer shape, and has a minimum diameter at both ends. It has the largest diameter at the center.
【００３１】第１端面部の寸法をｄ1 、第１端面部とは
軸方向に関して他端面にある第２端面部の寸法をｄ2 、
ヨーク３２の軸方向の長さをＬ、第１及び第２端面部の
間にある第１端面部からの軸方向距離がｘの点でのヨー
ク３２の外径寸法をｄ，とすると、ｄは次式で表わされ
る。The dimension of the first end face is d 1 , the dimension of the second end face at the other end face in the axial direction is d 2 ,
Assuming that the axial length of the yoke 32 is L and the outer diameter of the yoke 32 at a point where the axial distance from the first end face between the first and second end faces is x is d, d Is represented by the following equation.
【００３２】 ｄ＞ｄ1 ＋ｘ（ｄ2 −ｄ1 ）／Ｌ 上記構成の場合、ボビンレスコイル３１にヨーク３２を
挿入した時にボビンレスコイル３１が短絡する可能性が
あるのは、ヨーク３２の最大径部と接触している場合Ａ
〜Ｄまでであり、仮にこの場所の両端で短絡したとして
も数ターン分だけの磁気エネルギー損失となるだけで、
大きな駆動力損失は生じない。つまり、先述の各実施例
と同様に、電磁駆動装置の駆動力への影響は従来に比べ
て小さくすることができる。また、ボビンレスコイル３
１とヨーク３２との間に非動電部材を介在させなくても
良いのでコストダウンとなる。（発明と実施例との対応） 以上の実施例において、ボビンレスコイル１が本発明の
ボビンレスコイルに相当し、ヨーク２が本発明のヨーク
に相当し、巻き始め部１ａの端面の内径寸法ｒ 1 に比べ
て巻き終り部１ｂの端面の内径寸法ｒ 2 の方が大きくな
っている関係が本発明の第一内径部よりも該第二内径部
の方が内径が大に相当する。また、非動電部材３が本発
明の非動電部材に相当する。 D> d 1 + x (d 2 −d 1 ) / L In the above configuration, when the yoke 32 is inserted into the bobbin-less coil 31, there is a possibility that the bobbin-less coil 31 is short-circuited. When in contact with the largest diameter part A
~ D, and even if a short circuit occurs at both ends of this location, only a few turns of magnetic energy loss will result.
No significant driving force loss occurs. That is, similarly to the above-described embodiments, the influence on the driving force of the electromagnetic driving device can be reduced as compared with the related art. In addition, bobbinless coil 3
Since there is no need to interpose a non-electrodynamic member between 1 and the yoke 32, the cost is reduced. (Correspondence between Invention and Embodiment) In the above embodiment, the bobbinless coil 1 is
The yoke 2 corresponds to a bobbinless coil, and the yoke 2
Corresponds to, compared to the inner diameter r 1 of the end face of the winding start portion 1a
The inner diameter r 2 of the end face of the winding end portion 1b is larger.
The relationship between the first inner diameter portion and the second inner diameter portion of the present invention.
Has a larger inner diameter. In addition, the non-electrodynamic member 3
It corresponds to a light non-electrodynamic member.
【００３３】[0033]
【発明の効果】以上に説明したように、本発明の電磁駆
動装置では、ヨークをボビンレスコイル中に挿入する時
に相互に摺接する可能性のある部分を該コイル及び該ヨ
ークの限られた一部のみに形成し、該部分以外では該コ
イルと該ヨークとが相互接触しないようにしたので、該
ヨークを該コイル中に挿入した時に該コイルの極く一部
で短絡が生じても駆動力が著しく小さくなる恐れがな
く、従って、所定の基準よりも著しく駆動力の小さい不
良品が発生する恐れがなくなり、従来品よりも信頼性が
高く、また、製造コストの安価な電磁駆動装置を実現で
きる。また、ボビンレスコイルやヨークの寸法精度を従
来品よりもゆるやかにすることができるので、組み立て
も容易となり、組み立て能率もよくなるので製造コスト
低減もできる。また、従来装置のようにボビンレスコイ
ルの内径を大きくする必要がないので、従来装置よりも
小径化した電磁駆動装置を実現できる。As described above, in the electromagnetic driving device according to the present invention, when the yoke is inserted into the bobbinless coil, portions which may be in sliding contact with each other are limited by the coil and the yoke. Since the coil and the yoke do not come into contact with each other except at the portion, even if a short-circuit occurs at a very small portion of the coil when the yoke is inserted into the coil, the driving force is reduced. Is not significantly reduced, and therefore, there is no possibility that defective products having a driving force significantly smaller than a predetermined standard will be generated, thereby realizing an electromagnetic drive device which is higher in reliability than the conventional product and inexpensive in manufacturing cost. it can. In addition, since the dimensional accuracy of the bobbinless coil and the yoke can be made gentler than that of the conventional product, the assembling becomes easier and the assembling efficiency is improved, so that the manufacturing cost can be reduced. Also, unlike the conventional device, it is not necessary to increase the inner diameter of the bobbinless coil, so that an electromagnetic drive device having a smaller diameter than the conventional device can be realized.
【図１】本発明の第一実施例の電磁駆動装置の概略縦断
面図。FIG. 1 is a schematic longitudinal sectional view of an electromagnetic drive device according to a first embodiment of the present invention.
【図２】図１の構成における機能及び効果を説明するた
めの図。FIG. 2 is a view for explaining functions and effects in the configuration of FIG. 1;
【図３】本発明の第二実施例の電磁駆動装置の概略縦断
面図。FIG. 3 is a schematic longitudinal sectional view of an electromagnetic drive device according to a second embodiment of the present invention.
【図４】本発明の第三実施例の電磁駆動装置の概略縦断
面図。FIG. 4 is a schematic longitudinal sectional view of an electromagnetic drive device according to a third embodiment of the present invention.
【図５】図４の実施例の変形実施例を示した図。FIG. 5 is a diagram showing a modification of the embodiment of FIG. 4;
【図６】図４の実施例の別の変形実施例を示した図。FIG. 6 is a diagram showing another modified embodiment of the embodiment of FIG. 4;
【図７】本発明の第四実施例の電磁駆動装置の概略縦断
面図。FIG. 7 is a schematic longitudinal sectional view of an electromagnetic drive device according to a fourth embodiment of the present invention.
【図８】ボビンレスコイルを使用して構成された従来の
電磁駆動装置の概略縦断面図。FIG. 8 is a schematic longitudinal sectional view of a conventional electromagnetic drive device configured using a bobbinless coil.
【図９】従来装置で使用されているボビンレスコイルの
斜視図及び縦断面図。FIG. 9 is a perspective view and a longitudinal sectional view of a bobbinless coil used in a conventional device.
１，１１，２１，３１…ボビンレスコイル ２，１２，２２，３２…ヨーク ３３…非導電部
材1, 11, 21, 31 ... bobbinless coil 2, 12, 22, 32 ... yoke 33 ... non-conductive member
Claims (1)
に挿入されるヨークと、を有する電磁駆動装置におい
て、 前記コイルは、第一の端面部近傍に位置する第一内径部
と、該第一内径部とは軸方向に離れた第二の端面部近傍
に位置する第二内径部とを有し、該第一内径部よりも該
第二内径部の方が内径が大であり、該第二内径部と該ヨ
ークとの間には非動電部材が介在されていることを特徴
とする電磁駆動装置。1. An electromagnetic drive device comprising: a bobbinless coil; and a yoke inserted into an inner diameter portion of the coil, wherein the coil has a first inner diameter portion located near a first end surface, one is the inner diameter portion and a second inner diameter portion located on a second end face neighborhood of axially spaced, the inner diameter direction of said second inner diameter portion than the first inner diameter portion is large, the An electromagnetic drive device, wherein a non-electrodynamic member is interposed between the second inner diameter portion and the yoke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25699593A JP2937709B2 (en) | 1993-10-14 | 1993-10-14 | Electromagnetic drive |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25699593A JP2937709B2 (en) | 1993-10-14 | 1993-10-14 | Electromagnetic drive |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07111215A JPH07111215A (en) | 1995-04-25 |
| JP2937709B2 true JP2937709B2 (en) | 1999-08-23 |
Family
ID=17300261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25699593A Expired - Fee Related JP2937709B2 (en) | 1993-10-14 | 1993-10-14 | Electromagnetic drive |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2937709B2 (en) |
-
1993
- 1993-10-14 JP JP25699593A patent/JP2937709B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07111215A (en) | 1995-04-25 |
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