JPS6379306A - Manufacture of inductor - Google Patents
Manufacture of inductorInfo
- Publication number
- JPS6379306A JPS6379306A JP15380487A JP15380487A JPS6379306A JP S6379306 A JPS6379306 A JP S6379306A JP 15380487 A JP15380487 A JP 15380487A JP 15380487 A JP15380487 A JP 15380487A JP S6379306 A JPS6379306 A JP S6379306A
- Authority
- JP
- Japan
- Prior art keywords
- coil
- resin
- inductor
- magnetic powder
- powder
- 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
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000011347 resin Substances 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 28
- 239000006247 magnetic powder Substances 0.000 claims abstract description 16
- 238000009503 electrostatic coating Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 abstract description 7
- 229910000859 α-Fe Inorganic materials 0.000 abstract description 4
- 239000003822 epoxy resin Substances 0.000 abstract description 3
- 229920000647 polyepoxide Polymers 0.000 abstract description 3
- 238000007747 plating Methods 0.000 abstract 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 239000004850 liquid epoxy resins (LERs) Substances 0.000 description 2
- 238000007665 sagging Methods 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Landscapes
- Coils Or Transformers For Communication (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、インダクタの製造方法に関し、小型で大きな
インダクタンス値を有するインダクタを得るための、イ
ンダクタの！Ｆ！ｊ造方法に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a method for manufacturing an inductor, and a method for manufacturing an inductor to obtain an inductor that is small and has a large inductance value. F! Concerning the construction method.
（従来の技術）
従来のインダクタには、線材を所定数巻回してなる空芯
コイルを液状のエポキシ樹脂等に浸漬して引き上げ、そ
の後乾燥して熱硬化することにより得られたものがある
。ところが、このようにして得られたインダクタは、空
芯コイルであることから小型化という点では満足できて
も、大きいインダクタンス値を有するものが得にくいと
いう問題がある。このような問題を解決するには、コイ
ルを閉磁路コアに巻装するようにすればよいが、このよ
うにすると大型化してしまうという別の問題が生じる。(Prior Art) Some conventional inductors are obtained by immersing an air-core coil made of a predetermined number of turns of a wire in liquid epoxy resin, pulling it up, and then drying and thermosetting it. However, since the inductor thus obtained is an air-core coil, although it is satisfactory in terms of miniaturization, there is a problem in that it is difficult to obtain one with a large inductance value. In order to solve this problem, the coil may be wound around a closed magnetic circuit core, but this causes another problem of increasing the size.
そのため、小型で大きなインダクタンス値を有するイン
ダクタを得る方法として磁性粉を混在させた樹脂中にコ
イルを浸漬し、その被覆された樹脂により閉磁路を形成
させるということが考えられる。Therefore, one possible method for obtaining a small inductor with a large inductance value is to immerse a coil in a resin mixed with magnetic powder, and form a closed magnetic circuit with the coated resin.
〈発明が解決しようとする問題点〉
ところが、上記のように磁性粉を混在させた樹脂中にコ
イルを浸漬する場合には、次のようなさらに別の、問題
が生じる。つまり、磁性粉の混在された樹脂は粘度が高
く、しかもコイルが小型の場合にはコイルを形成してい
る線材間のすき間が狭いため、磁性粉の混在された樹脂
を気泡等を存在させることなくコイル全体に均一に被覆
することが困難となる。また、液状の樹脂中からフィル
を引き上げるとき、コイルの引き上げ方向と反対側であ
るコイル下部に、いわゆるタレ現象が生じてコイルを被
覆する樹脂厚みが不均一になるとともに、硬化するまで
に樹脂中の磁性粉が比重のちがいによってコイル下部側
に移動し、その結果、磁性粉が偏在することになってイ
ンダクタンス値のバラツキが不可避的に大きくなってし
まう。<Problems to be Solved by the Invention> However, when a coil is immersed in a resin mixed with magnetic powder as described above, the following problem arises. In other words, the resin mixed with magnetic powder has a high viscosity, and when the coil is small, the gaps between the wires forming the coil are narrow, so it is difficult to make the resin mixed with magnetic powder have air bubbles, etc. This makes it difficult to coat the entire coil uniformly. In addition, when pulling up the fill from the liquid resin, a so-called sagging phenomenon occurs at the bottom of the coil, which is the opposite side to the direction in which the coil is pulled up, making the thickness of the resin covering the coil uneven. The magnetic powder moves toward the lower part of the coil due to the difference in specific gravity, and as a result, the magnetic powder becomes unevenly distributed, which inevitably increases the variation in the inductance value.
本発明は、このような点に鑑みてなされたもので、磁性
粉の混在された樹脂によりコイルを被覆するようにした
場合でも、樹脂をコイル全体に均一に被覆することがで
きて、インダクタンス値が大きく、製品間のインダクタ
ンス値のバラツキの小さな品質の安定したインダクタを
得ることのできる、インダクタの製造方法を提供するこ
とを目的とする。The present invention has been made in view of these points, and even when a coil is coated with a resin mixed with magnetic powder, the resin can be coated uniformly over the entire coil, and the inductance value can be reduced. An object of the present invention is to provide a method for manufacturing an inductor that can obtain a stable quality inductor with a large inductance value and a small variation in inductance value between products.
（問題点を解決するための手段）
本発明は、このような目的を達成するために、磁性粉の
混在された樹脂を静電塗装によりコイルに被覆するよう
にしたことを特徴としている。(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized in that the coil is coated with a resin mixed with magnetic powder by electrostatic coating.
（実施例） 以下に本発明の一実施例を図面を参照して説明する。(Example) An embodiment of the present invention will be described below with reference to the drawings.
図において、１は銅線等の線材を所要数巻回してなる空
芯コイル、２はこの空芯コイル１の全体を被覆した樹脂
で、エポキシ系等の樹脂に焼結されたフェライト粉末を
微粉状にした磁性粉を混在させたものである。このよう
な磁性粉の混在された樹脂２は、静電塗装により空芯コ
イル１に付着され、その後、加熱溶融されて空芯コイル
１を被覆したものである。In the figure, 1 is an air-core coil made by winding a required number of wires such as copper wire, and 2 is a resin that covers the entire air-core coil 1, which is a fine powder of ferrite powder sintered with epoxy resin or other resin. It is a mixture of shaped magnetic powder. The resin 2 mixed with magnetic powder is applied to the air-core coil 1 by electrostatic coating, and then heated and melted to cover the air-core coil 1.
本発明は、上記のように磁性粉の混在された樹脂を静電
塗装によりコイルに被覆するようにした点に特徴を有す
るものであるが、本発明の製造方法により１りられたイ
ンダクタと、従来の製造方法により得られたインダクタ
につき、それらのインダクタンス値とそのバラツキを下
表に示す。The present invention is characterized in that the resin mixed with magnetic powder is coated on the coil by electrostatic coating as described above. The table below shows the inductance values and variations thereof for inductors obtained by conventional manufacturing methods.
ここで、本発明の製造方法により得られたインダクタは
、焼結されたフェライト微粉末を重量比で５０％混在さ
せた粉末状のエポキシ樹脂を静電塗装により空芯コイル
に付着させたのち、加熱溶融し、その後硬化させたもの
である。これに対し、従来の製造方法により得られたイ
ンダクタは、焼結されたフェライト微粉末をｆｆ１ｆｆ
ｉ比で５０％混在させた液状のエポキシ樹脂中に空芯コ
イルを浸漬して引き上げたのち、熱硬化して得たもので
ある。Here, the inductor obtained by the manufacturing method of the present invention is produced by attaching a powdered epoxy resin containing 50% by weight of sintered fine ferrite powder to an air-core coil by electrostatic coating. It is heated and melted and then hardened. On the other hand, the inductor obtained by the conventional manufacturing method uses sintered ferrite fine powder as ff1ff.
It was obtained by immersing an air-core coil in a liquid epoxy resin mixed with an i ratio of 50%, pulling it up, and then thermosetting it.
なお、空芯コイルは、線径０，２３ｍｍφのウレタン被
覆銅線を７．６ｍｍφの外径で５０タ一ン巻回したもの
で、上表の値は、空芯コイルの同じ母集団からランダム
に２０個づつ抜き取り、それらの測定値から１９たもの
である。上記空芯コイルの母集団のインダクタンスの平
均値７は１６，８μＨであり、標準偏差へは０．３μＨ
である。上表から明らかなように、静電塗装により樹脂
被覆をおこなった本発明により得られたインダクタは、
従来のものよりもすぐれていることが理解できる。The air-core coil is made by winding a urethane-coated copper wire with a wire diameter of 0.23 mmφ in 50 turns with an outer diameter of 7.6 mmφ.The values in the above table are randomly selected from the same population of air-core coils. 20 samples were taken from each sample, and 19 samples were obtained from those measurements. The average value 7 of the inductance of the population of the above air-core coil is 16.8 μH, and the standard deviation is 0.3 μH.
It is. As is clear from the above table, the inductor obtained by the present invention coated with resin by electrostatic coating has the following properties:
It can be seen that it is superior to the conventional one.
なお、上記の実施例においては、空芯コイルに樹脂を被
覆するものについて説明したが、空芯コイルに棒状コア
を挿通したものについても同様に実施することができる
ことはいうまでもない。In the above embodiments, an air-core coil coated with resin has been described, but it goes without saying that the same can be applied to an air-core coil with a rod-shaped core inserted therethrough.
（発明の効果）
本発明のインダクタの製造方法は、以上説明したように
、磁性粉の混在された樹脂を静電塗装によりコイルに被
覆するようにしたものであるため、樹脂も磁性粉も同時
に静電吸引力によりコイルに付着されて、いわゆるタレ
現象が生じず、コイル全体に均一に樹脂を被覆すること
ができる。しかも、樹脂は粉末状であるため、磁性粉の
比重が樹脂と異なっていても樹脂中で偏在しにくく、そ
のためインダクタンス値が大きく、バラツキの小さな品
質の安定したインダクタを得ることができる。(Effects of the Invention) As explained above, in the method for manufacturing an inductor of the present invention, the resin mixed with magnetic powder is coated on the coil by electrostatic coating. The resin is attached to the coil by electrostatic attraction, so that the so-called sagging phenomenon does not occur, and the entire coil can be uniformly coated with the resin. Moreover, since the resin is in powder form, even if the specific gravity of the magnetic powder is different from that of the resin, it is unlikely to be unevenly distributed in the resin, and therefore an inductor with a high inductance value and stable quality with small variations can be obtained.
図は本発明により得られたインダクタの縦断面図である
。
１・・・空芯コイル、２・・・樹脂。The figure is a longitudinal cross-sectional view of an inductor obtained according to the present invention. 1...Air core coil, 2...Resin.
Claims (1)
したことを特徴とする、インダクタの製造方法。A method for manufacturing an inductor, characterized in that a coil is coated with a resin mixed with magnetic powder by electrostatic coating.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15380487A JPS6379306A (en) | 1987-06-19 | 1987-06-19 | Manufacture of inductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15380487A JPS6379306A (en) | 1987-06-19 | 1987-06-19 | Manufacture of inductor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6379306A true JPS6379306A (en) | 1988-04-09 |
| JPS6337484B2 JPS6337484B2 (en) | 1988-07-26 |
Family
ID=15570485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15380487A Granted JPS6379306A (en) | 1987-06-19 | 1987-06-19 | Manufacture of inductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6379306A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6204744B1 (en) * | 1995-07-18 | 2001-03-20 | Vishay Dale Electronics, Inc. | High current, low profile inductor |
| US6377152B1 (en) * | 1998-06-23 | 2002-04-23 | Murata Manufacturing Co., Ltd. | Bead inductor and method of manufacturing same |
| US6529109B1 (en) * | 1998-06-23 | 2003-03-04 | Murata Manufacturing Co., Ltd. | Bead inductor |
| US6950006B1 (en) * | 1998-09-29 | 2005-09-27 | Murata Manufacturing Co., Ltd. | Composite inductor element |
| US7034645B2 (en) | 1999-03-16 | 2006-04-25 | Vishay Dale Electronics, Inc. | Inductor coil and method for making same |
| US7263761B1 (en) | 1995-07-18 | 2007-09-04 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US7921546B2 (en) | 1995-07-18 | 2011-04-12 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| CN107871589A (en) * | 2017-05-31 | 2018-04-03 | 洪豪立 | Electrodeless formula graphene smoothing choke and preparation method thereof |
| US10319507B2 (en) | 2006-08-09 | 2019-06-11 | Coilcraft, Incorporated | Method of manufacturing an electronic component |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52367A (en) * | 1975-06-20 | 1977-01-05 | Matsushita Electric Ind Co Ltd | Electromagnetic coil |
| JPS54163354A (en) * | 1978-06-16 | 1979-12-25 | Daido Steel Co Ltd | Coil and method of producing same |
-
1987
- 1987-06-19 JP JP15380487A patent/JPS6379306A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52367A (en) * | 1975-06-20 | 1977-01-05 | Matsushita Electric Ind Co Ltd | Electromagnetic coil |
| JPS54163354A (en) * | 1978-06-16 | 1979-12-25 | Daido Steel Co Ltd | Coil and method of producing same |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7921546B2 (en) | 1995-07-18 | 2011-04-12 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US7345562B2 (en) | 1995-07-18 | 2008-03-18 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US6460244B1 (en) | 1995-07-18 | 2002-10-08 | Vishay Dale Electronics, Inc. | Method for making a high current, low profile inductor |
| US7263761B1 (en) | 1995-07-18 | 2007-09-04 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US6204744B1 (en) * | 1995-07-18 | 2001-03-20 | Vishay Dale Electronics, Inc. | High current, low profile inductor |
| US7986207B2 (en) | 1995-07-18 | 2011-07-26 | Vishay Dale Electronics, Inc. | Method for making a high current low profile inductor |
| US7221249B2 (en) | 1995-07-18 | 2007-05-22 | Vishay Dale Electronics, Inc. | Inductor coil |
| US6377152B1 (en) * | 1998-06-23 | 2002-04-23 | Murata Manufacturing Co., Ltd. | Bead inductor and method of manufacturing same |
| US6529109B1 (en) * | 1998-06-23 | 2003-03-04 | Murata Manufacturing Co., Ltd. | Bead inductor |
| US6950006B1 (en) * | 1998-09-29 | 2005-09-27 | Murata Manufacturing Co., Ltd. | Composite inductor element |
| US7034645B2 (en) | 1999-03-16 | 2006-04-25 | Vishay Dale Electronics, Inc. | Inductor coil and method for making same |
| US10319507B2 (en) | 2006-08-09 | 2019-06-11 | Coilcraft, Incorporated | Method of manufacturing an electronic component |
| US11869696B2 (en) | 2006-08-09 | 2024-01-09 | Coilcraft, Incorporated | Electronic component |
| CN107871589A (en) * | 2017-05-31 | 2018-04-03 | 洪豪立 | Electrodeless formula graphene smoothing choke and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6337484B2 (en) | 1988-07-26 |
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