JPH10144515A - Magnetic paste - Google Patents
Magnetic pasteInfo
- Publication number
- JPH10144515A JPH10144515A JP35338596A JP35338596A JPH10144515A JP H10144515 A JPH10144515 A JP H10144515A JP 35338596 A JP35338596 A JP 35338596A JP 35338596 A JP35338596 A JP 35338596A JP H10144515 A JPH10144515 A JP H10144515A
- Authority
- JP
- Japan
- Prior art keywords
- magnetic
- paste
- magnetic flux
- ferromagnetic
- leakage
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/14—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates
- H01F41/16—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for applying magnetic films to substrates the magnetic material being applied in the form of particles, e.g. by serigraphy, to form thick magnetic films or precursors therefor
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Soft Magnetic Materials (AREA)
- Insulating Of Coils (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、磁界が生じる各種
の電磁界において使用される磁性ペーストに関するもの
である。The present invention relates to a magnetic paste used in various electromagnetic fields in which a magnetic field is generated.
【０００２】[0002]
【従来の技術】電磁界に使用されるたわみ性を有する磁
性板等は、従来から優れた磁芯等から発生する磁気漏洩
の遮断機として利用されていた。また、磁性粉末をセメ
ントに混合した磁性モルタル等も電磁波吸収体として活
用されていることは、周知の所である。前者において
は、単品毎の磁芯から発生する磁気漏洩を防止するに
は、コイルの隙間まで充填することができず近傍の電子
部材に磁気漏洩の影響を皆無とすることはできないとい
う欠陥がある。後者磁性モルタルにおいては、ポータブ
ル型の電子機器の耐振性或は耐衝撃性、更には、電子部
品の熱膨張係数の差によるクラック等の発生を防止する
策がなく、信頼性に欠けるという重大な欠陥があった。2. Description of the Related Art A flexible magnetic plate or the like used for an electromagnetic field has conventionally been used as a circuit breaker for magnetic leakage generated from an excellent magnetic core or the like. It is well known that a magnetic mortar obtained by mixing a magnetic powder with cement is also used as an electromagnetic wave absorber. In the former, there is a defect that in order to prevent magnetic leakage generated from the magnetic core of each product, it is not possible to fill up the gap between the coils, and it is not possible to eliminate the influence of magnetic leakage on the nearby electronic members. . In the latter magnetic mortar, there is no measure to prevent the vibration resistance or shock resistance of portable electronic equipment, and the occurrence of cracks due to the difference in the thermal expansion coefficient of electronic parts, and this is a serious lack of reliability. There were defects.
【０００３】[0003]
【発明が解決しようとする課題】本発明では前述の二つ
の欠陥、すなはち、充填性に秀れることと、キュア完了
後も適度なる充填性を有し、被電磁部材の熱膨張係数の
差による亀裂等を防止することを目的とする。According to the present invention, the above-mentioned two defects, namely, excellent filling properties and adequate filling properties even after completion of curing, have a small thermal expansion coefficient of the electromagnetic member. The purpose is to prevent cracks and the like due to differences.
【０００４】[0004]
【課題を解決するための手段】以上の課題を解決するた
め、本発明では、キュア完了後も適度なる型状を有する
高分子系樹脂を接合剤として重量比で、１％〜８０％の
範囲で残分は強磁性体粉末を充当して強磁性を有するペ
ーストを作る。これらの接着剤と強磁性体粉の割合は使
用するそれぞれの固有の性質、例えば、比重の重い合金
性の粉末とフェライトの様な酸化物からなる比重の軽い
もの、或は、その用途から特に大きなたわみ性を有する
場合、逆に、磁気導磁率を必要とする場合に等によっ
て、それぞれの範囲は選定されるが、本発明の請求の範
囲以外の領域では、そのペーストの柔軟性並びに磁気導
磁率が本発明の特徴とする機能を発揮するに至らず目的
に従うことができない。磁性粉末の割合を多くすれば、
柔軟性が損なわれ、逆に少なくすれば磁気漏洩の遮断機
能に大きく関与する磁気導磁率を高くすることができな
いというそれ等の効果は互いに相反する関係にあるため
に、それ等の混合割合の範囲が決定される。In order to solve the above problems, in the present invention, a high molecular weight resin having an appropriate shape even after completion of curing is used as a bonding agent in a weight ratio of 1% to 80%. The remainder is applied with ferromagnetic powder to produce a ferromagnetic paste. The ratio of these adhesives and ferromagnetic powders depends on the specific properties of each used, for example, those having a low specific gravity consisting of an alloying powder having a high specific gravity and an oxide such as ferrite, or a material having a low specific gravity. The respective ranges are selected depending on the case where the material has great flexibility, or conversely, the case where the magnetic permeability is required. However, in regions other than the scope of the claims of the present invention, the flexibility of the paste and the magnetic conductivity are determined. The magnetic susceptibility does not fulfill the function characteristic of the present invention and cannot be used for the purpose. By increasing the proportion of magnetic powder,
Flexibility is impaired, and conversely, if it is reduced, it is not possible to increase the magnetic permeability, which greatly contributes to the function of blocking magnetic leakage, and these effects are in conflict with each other. The range is determined.
【０００５】[0005]
【発明の実施の形態】従来から用いられている柔軟性を
備えた磁性体を含む板状の成型物では、漏洩磁界を発生
する磁芯等のコイルそのものに充填され、密着をした状
態での磁気遮断の作用は不可能であり、本発明の磁気ペ
ースト状で所定の所に充填した後に、キュアにより硬化
するものでなければ本発明の目的の作用は図れない。
又、従来の磁性粉を含有したモルタル状のものでは、漏
洩磁界を発生する磁芯の温度は時には、１００℃以上に
もなり、モルタルとの熱膨張係数の差によって、クラッ
クを発生する。又、これらの電子装置は多くの場合、ポ
ータブル型で使用されるために、耐衝撃性は、必要条件
として要求されるが、モルタル質では、脆弱であるため
にその目的に応えることが不可能である。本発明の接着
剤として、高分子系の素材を使用する。例えば、ケイ素
樹脂或は、合成ゴム系であるとかキュア完了後も適度な
る柔軟性を有するものを活用し、目的に応じて、一種類
のみならずそれ以上の磁性材料からなる粉末を混合し、
練り合わせて完成したペースト状の磁性体でなければ本
発明の目的に従うことはない。DESCRIPTION OF THE PREFERRED EMBODIMENTS A plate-like molded product containing a magnetic material having flexibility, which has been conventionally used, is filled in a coil itself such as a magnetic core that generates a leakage magnetic field, and is in a state of being in close contact with the coil. The effect of magnetic interruption is not possible, and the intended effect of the present invention cannot be achieved unless the magnetic paste of the present invention is filled in a predetermined place and cured by curing.
In the case of a conventional mortar containing magnetic powder, the temperature of the magnetic core that generates a leakage magnetic field sometimes reaches 100 ° C. or more, and cracks occur due to the difference in the coefficient of thermal expansion from the mortar. In addition, since these electronic devices are often used in a portable type, impact resistance is required as a necessary condition, but mortar material is fragile and cannot meet its purpose. It is. A polymer material is used as the adhesive of the present invention. For example, a silicon resin or a synthetic rubber-based material or a material having moderate flexibility even after completion of curing is utilized, and according to the purpose, powder of not only one kind but also more magnetic materials is mixed,
The purpose of the present invention is not followed unless the paste-like magnetic material is completed by kneading.
【０００６】[0006]
【実施例】本発明の原理を具体化するために、最も関係
業界で多く利用されているＥＩとリング型の磁芯コイル
の２種を漏洩磁束の源として選んだ。最初に、実施例の
材料として選んだＥＩ型の磁芯は、幅、高さ、厚みがそ
れぞれ２８、３２、６m/mの磁芯に直径０．７mmのコイ
ルをＤＣバイアス０（Ａ）で１，２００μＨになる様に
捲いたチョークコイルに２ＡのＤＣ電流を流した場合の
０．５ガウスの漏洩磁束密度の等値線は、第２図ｂに見
受けられる様にコイルの中心が軸の延長線方向で前面側
はチョークコイルの中心から５cmにも及び又、開口部を
有さない背面側にも４cmに達している。これらのチョー
クコイルに粉砕前の導磁率が７０００であった粉末の強
磁性体からなる粒子に、高分子系のキュア完了後も柔軟
性を残すシリコン樹脂からなる接着剤を７０：３０の割
合で添加し、充分に分散混合させたペーストを、その外
周部にコーキング剤の注入の様な手法で約７mm厚に被覆
することにより漏洩磁束を遮断した結果、ガウスメータ
ーでの検知が殆ど零であった。次に形状的には、最も磁
気漏洩磁束の少ないと考えられるリング状で、外径、内
径、厚みがそれぞれ２４、８、１４m/mの磁芯に直径
０．８mmのコイルを捲き３００μＨのインダクタンスが
生じるチョークコイルを作り外部に漏洩する磁束密度を
測定する為に直流電源を２．０Ａ流した場合の側面図は
第２図ａに見られる様に０．５ガウス以上の漏洩の範囲
は外径が約３０mmで、換言すれば、磁芯の外周辺より約
３．０mm以内に限定されているが、現実に磁束の漏洩は
皆無ではない。リング状磁芯が露出したコイルの外周部
分の磁束流は大部分の磁束を隣接するコイルにより発生
した磁束Ｆ1、Ｆ2の極性が相反する為に、相殺し合う
が、その一部がすなはち磁芯の中心から放射線方向並び
にその中心軸に直交する前後の面には有害な磁束が相互
に充分相殺できない為に、使用に際してはその磁束がノ
イズとなる。第３図ａ、ｂにそれぞれ正面図と側面図を
磁性素材から構成されるリング状の磁芯３１に半田メッ
キ部分３２−１を設けポリウレタン等の絶縁性の被覆を
施したワイヤー３２を、コイル状に図の如く捲き、その
各捲線から発生する矢印状の磁束Ｆ1、Ｆ2（他のコイル
からもそれぞれ発生するが図面上は割愛した）の有害な
る磁束密度の強度が及ぶ範囲の目安として０．５ガウス
の場合、第２図ａの如く、その周辺３m/m程度である。
磁束密度を何ガウス以下に抑制すればよいかは、目的と
するノイズレベルの規格値によって適正に選択する訳で
あるが、一つの簡単な漏洩磁束の状況を知る為には、磁
性流体を、電流を流したコイルに被覆させることによっ
て、その磁性流体が構成する磁束流に従じた模様から知
ることが可能である。この磁束流から判明した漏洩磁束
流を完全に吸収する様に微粉なる強磁性粉体と高分子系
の樹脂からなる接合剤を混合した「磁性ペースト」をも
って被覆する。この漏洩磁束流をコイルの小さな空隙に
充填ができるペースト状の磁性体で包み込み、外部にノ
イズの原因となる漏洩磁束を完全に遮断させる。注型方
式、或は、コーキング方式で前述の磁性ペーストを磁芯
リングの外径は約２０％大きく、内径は２０％小さく、
厚みは３０％大きい寸法になる様にコーティングした。
すなはち、外径ｄ0内径ｄi厚さｈの磁芯コイルに対し
て、コーティング後の寸法を、外径Ｄ：１．２ｄ0、内
径ｄ：０．８ｄi、厚さＨ：１．３ｈ、のコーティング
完成品ができた。その状態をモデル的に示したものが第
１図ａ、ｂにそれぞれ正面と側面図で示され、磁性ペー
スト１１が磁芯３１とコイル３２の小さな空隙にまでも
浸透し、各コイルの周辺部に密着して外部に磁束流を漏
洩することは殆どなく、高感度のガウスメーターでもっ
ても検出することが困難であり、この程度であれば、電
子部材としてノイズを発生し他に影響与えることはは皆
無であると予想される。本発明の実施例としては、磁芯
の型をリングとＥＩ型についてのみ説明したが、電磁シ
ールドルーム等の電磁遮蔽タイルの目地の埋め合わせ等
の磁気吸収剤としての用途も見込めるが、それ等は本発
明の応用される利用分野であり、当然本発明の範囲に含
まれる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to embody the principle of the present invention, two types of EI and ring-shaped magnetic core coils, which are used most in related industries, were selected as sources of magnetic flux leakage. First, the EI type magnetic core selected as the material of the embodiment has a width, height, and thickness of 28, 32, and 6 m / m, respectively, and a 0.7 mm diameter coil with a DC bias of 0 (A). When a DC current of 2 A is applied to a choke coil wound to 1,200 μH, a contour line of a leakage magnetic flux density of 0.5 Gauss is obtained, as shown in FIG. In the extension direction, the front side extends 5 cm from the center of the choke coil, and also reaches 4 cm from the back side having no opening. A powdery ferromagnetic particle having a magnetic permeability of 7000 before pulverization in these choke coils was coated with a silicone resin adhesive in a ratio of 70:30, which remained flexible even after completion of the polymer curing. As a result of blocking the leakage magnetic flux by coating the added and thoroughly dispersed and mixed paste to a thickness of about 7 mm on the outer periphery thereof by a method such as injection of a caulking agent, detection by a Gauss meter was almost zero. Was. Next, in terms of shape, it is a ring shape that is considered to have the least magnetic leakage flux, and a coil with a diameter of 0.8 mm is wound around a magnetic core with outer diameter, inner diameter and thickness of 24, 8, and 14 m / m, respectively, and an inductance of 300 μH. Fig. 2a shows a side view when a DC power supply of 2.0 A is applied to measure the magnetic flux density leaking to the outside by making a choke coil in which the leakage occurs. Although the diameter is limited to about 30 mm, in other words, limited to about 3.0 mm from the outer periphery of the magnetic core, there is actually no leakage of magnetic flux. The magnetic flux flow in the outer peripheral portion of the coil where the ring-shaped magnetic core is exposed cancels out most of the magnetic flux because the polarities of the magnetic fluxes F 1 and F 2 generated by the adjacent coils are opposite to each other. In other words, harmful magnetic fluxes cannot sufficiently cancel each other on the front and rear surfaces perpendicular to the direction of radiation and the central axis from the center of the magnetic core. FIGS. 3a and 3b show a front view and a side view, respectively, of a wire 32 having a ring-shaped magnetic core 31 made of a magnetic material provided with a solder plating portion 32-1 and coated with an insulating material such as polyurethane. As shown in the figure, the magnetic fluxes F 1 and F 2 in the form of arrows generated from each of the windings (each generated from other coils but omitted from the drawing) are indicative of the range over which the intensity of the harmful magnetic flux density reaches. In the case of 0.5 gauss, as shown in FIG. 2a, it is around 3 m / m.
How to suppress the magnetic flux density to less than Gauss is appropriately selected according to the standard value of the target noise level, but in order to know the situation of one simple leakage magnetic flux, the magnetic fluid must be By covering the coil through which the current flows, it is possible to know from the pattern according to the magnetic flux flow constituted by the magnetic fluid. It is covered with a "magnetic paste" in which a ferromagnetic powder, which is a fine powder, and a bonding agent made of a polymer resin are mixed so as to completely absorb the leakage magnetic flux flow found from the magnetic flux flow. This leakage magnetic flux flow is wrapped in a paste-like magnetic material that can be filled in a small gap of the coil, and the leakage magnetic flux causing noise is completely shut off to the outside. The outer diameter of the magnetic core ring is about 20% larger and the inner diameter is 20% smaller, using the casting method or the caulking method.
The coating was applied so that the thickness was 30% larger.
That is, for the magnetic core coil having the outer diameter d 0 and the inner diameter d i and the thickness h, the dimensions after coating are as follows: outer diameter D: 1.2 d 0 , inner diameter d: 0.8 d i , and thickness H: 1 .3h, a finished coating product was obtained. FIGS. 1A and 1B are front and side views respectively showing a model of this state. The magnetic paste 11 penetrates even into a small gap between the magnetic core 31 and the coil 32, and the peripheral portion of each coil. It hardly leaks magnetic flux to the outside in close contact with it, and it is difficult to detect it even with a high-sensitivity Gauss meter. Is expected to be completely absent. As an embodiment of the present invention, the type of the magnetic core has been described only for the ring and the EI type. This is an application field to which the present invention is applied, and is naturally included in the scope of the present invention.
【０００７】[0007]
【発明の効果】本発明の磁性ペーストは、多くの磁場を
発生する磁芯の漏洩磁束の防止のみならず、磁気の吸収
遮蔽効果を活用した広い分野での利用が見込め、工業的
に価値がある。Industrial Applicability The magnetic paste of the present invention is expected to be used not only in preventing magnetic flux leakage from a magnetic core that generates a large amount of magnetic field but also in a wide range of fields utilizing a magnetic absorption / shielding effect. is there.
図１は、本考案の磁芯の一例を正面図と側面図で示す。
図２は、従来型の磁芯のトロイダル型ＥＩ型のものが
０．５ガウス漏洩磁束密度を発生させる範囲を示したも
のである。図３は、従来のトロイダル型磁芯を正面図と
側面図で示す。FIG. 1 shows an example of a magnetic core of the present invention in a front view and a side view.
FIG. 2 shows a range in which a conventional magnetic core of a toroidal type EI type generates a 0.5 gauss leakage magnetic flux density. FIG. 3 shows a conventional toroidal magnetic core in a front view and a side view.
数字１１は強磁性微粉体と高分子系樹脂からなる磁気ペ
ーストのコーティング ３１は磁芯 ３２はコイル ３２−１はコイルの半田あげ部分 Ｆ1、Ｆ2は磁束流のモデル Ｓは磁芯の外周端と半田あげまでの間隙、をそれぞれ示
す。Numeral 11 is a magnetic paste coating composed of ferromagnetic fine powder and a polymer resin 31 is a magnetic core 32 is a coil 32-1 is a soldered portion of the coil F 1 and F 2 are magnetic flux models S is an outer periphery of the magnetic core The gap from the end to the soldering is shown.
Claims (1)
れる高分子系接合剤に、強磁性体粉末を重量比において
２０％から９９％まで充填したことを特徴とする磁性ペ
ースト。A magnetic paste characterized in that a ferromagnetic powder is filled from 20% to 99% by weight in a polymer bonding agent cured by maintaining temperature and time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35338596A JPH10144515A (en) | 1996-11-12 | 1996-11-12 | Magnetic paste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP35338596A JPH10144515A (en) | 1996-11-12 | 1996-11-12 | Magnetic paste |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10144515A true JPH10144515A (en) | 1998-05-29 |
Family
ID=18430485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP35338596A Pending JPH10144515A (en) | 1996-11-12 | 1996-11-12 | Magnetic paste |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10144515A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100487625B1 (en) * | 2002-06-12 | 2005-05-03 | 정환명 | Manufacture method for making Magnetic Paste |
| WO2011036335A1 (en) * | 2009-09-25 | 2011-03-31 | Kone Corporation / Patent Departmemt | Machinery brake |
-
1996
- 1996-11-12 JP JP35338596A patent/JPH10144515A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100487625B1 (en) * | 2002-06-12 | 2005-05-03 | 정환명 | Manufacture method for making Magnetic Paste |
| WO2011036335A1 (en) * | 2009-09-25 | 2011-03-31 | Kone Corporation / Patent Departmemt | Machinery brake |
| EP2480488A1 (en) * | 2009-09-25 | 2012-08-01 | Kone Corporation / Patent Departmemt | Machinery brake |
| EP2480488A4 (en) * | 2009-09-25 | 2013-05-15 | Kone Corp | Machinery brake |
| US9834420B2 (en) | 2009-09-25 | 2017-12-05 | Kone Corporation | Machinery brake |
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