JPS59198705A - Induction coil - Google Patents

Induction coil

Info

Publication number
JPS59198705A
JPS59198705A JP58074252A JP7425283A JPS59198705A JP S59198705 A JPS59198705 A JP S59198705A JP 58074252 A JP58074252 A JP 58074252A JP 7425283 A JP7425283 A JP 7425283A JP S59198705 A JPS59198705 A JP S59198705A
Authority
JP
Japan
Prior art keywords
induction coil
coil
distributed capacitance
metal foil
coil according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP58074252A
Other languages
Japanese (ja)
Inventor
Nobumasa Amagasa
天笠　信正
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP58074252A priority Critical patent/JPS59198705A/en
Priority to EP84301355A priority patent/EP0117764A1/en
Publication of JPS59198705A publication Critical patent/JPS59198705A/en
Priority to US06/816,957 priority patent/US4750077A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K19/00—Synchronous motors or generators
    • H02K19/16—Synchronous generators
    • H02K19/36—Structural association of synchronous generators with auxiliary electric devices influencing the characteristic of the generator or controlling the generator, e.g. with impedances or switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/006—Details of transformers or inductances, in general with special arrangement or spacing of turns of the winding(s), e.g. to produce desired self-resonance
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/28—Coils; Windings; Conductive connections
    • H01F27/32—Insulating of coils, windings, or parts thereof
    • H01F27/323—Insulation between winding turns, between winding layers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F27/00—Details of transformers or inductances, in general
    • H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
    • H01F27/343—Preventing or reducing surge voltages; oscillations
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/26—Devices for sensing voltage, or actuated thereby, e.g. overvoltage protection devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Coils Of Transformers For General Uses (AREA)
  • Electromagnets (AREA)

Abstract

PURPOSE:To reduce a high-frequency overvoltage such as a switching surge to be generated in a circuit according to existence of inductance by a method wherein a means to generate large distributed capacity is provided to an induction coil itself to bestow the prescribed frequency characteristic. CONSTITUTION:An equivalent circuit as shown in the figure is formed to an induction coil 10 according to a film tape 12 containing metal foil and a wound conductor 11. The equivalent circuit thereof is constructed of coil inductance 13 and distributed capacity 14, accordingly the inductance coil 10 itself has a frequency characteristic, and moreover forms a kind of low-pass filter. By increasing distributed capacity between the coil turns like this to bestow the frequency characteristic to the induction coil, a surge voltage to be generated according to existence of inductance thereof can be reduced effectively by addition of a little cost. Moreover in addition thereto, to provide a specially protective device to a switching circuit is made unnecessarily, for example, and as a result, a low cost equipment can be obtained even when the equipment is formed in large capacity.

Description

【発明の詳細な説明】 本発明は、誘導コイル、すなわち、各種リアクトル電磁
石等に用いられる誘導コイルの改善に関するものである
。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in induction coils, that is, induction coils used in various reactor electromagnets and the like.

この誘導コイルが血み込まれている装置の一例として、
直流電源設備を結線図により示すと、添付図面第１図の
とおりである。As an example of a device in which this induction coil is incorporated,
The wiring diagram of the DC power supply equipment is shown in Figure 1 of the attached drawings.

図において、符号／は変圧器、コはサイリスク整流装置
、３は直流リアクトル、グは遮断器、Ｓは負荷装置を示
すものであって、この直流電源設備は、受電後、変圧器
／で電圧を落とし、サイリスク整流装置−によって直流
に変換し、誘導コイルによって構成される直流リアクト
ル３により平滑にし、負荷装置りに直流を供給する設備
である。In the figure, the symbol / is a transformer, C is a silice rectifier, 3 is a DC reactor, G is a circuit breaker, and S is a load device. This is equipment that supplies direct current to a load device by converting it into direct current using a silice rectifier, smoothing it using a direct current reactor 3 made up of an induction coil, and supplying direct current to a load device.

なお、電源の開閉は、遮断器グや負荷装置の中の遮断装
置によって行なう。Note that the power supply is opened and closed by a circuit breaker or a circuit breaker in the load device.

また、誘導コイルが組み込まれた他の例を、サイリスタ
レオナード装置等に使用されるサイリスク回路の回路図
を示した添付図面第２図に基づいて、次に説明する。Another example in which an induction coil is incorporated will be described below with reference to FIG. 2 of the accompanying drawings, which shows a circuit diagram of a thyrisk circuit used in a thyristor Leonard device or the like.

図において、符号６は誘導コイルより成る交流リアクト
ル、７はサイリスタ素子、ｇはヒユーズ、ｔはアームス
ナバ回路である。In the figure, numeral 6 is an AC reactor made of an induction coil, 7 is a thyristor element, g is a fuse, and t is an arm snubber circuit.

このような回路においては、交流はサイリスク素子７に
よって整流されて直流となるが、サイリスタ素子の電流
保護のためにヒユーズざが、また、電圧保護のためにス
ナバ回路デが設けられており、更に、交流リアクトル６
は一般に共通電源間の相互干渉や事故電流の抑制を行な
うために設けられている。In such a circuit, alternating current is rectified by the thyristor element 7 to become direct current, but a fuse is provided to protect the current of the thyristor element, and a snubber circuit is provided to protect the voltage. , AC reactor 6
is generally provided to suppress mutual interference between common power supplies and fault current.

このような誘導コイル、これら以外にも、例えば、消弧
リアクトルや、あるいは、電磁石等、多くの目的のため
に、使用され、そして、回路にインダクタンスとして、
存在している。In addition to these, such induction coils are used for many other purposes, such as arc-extinguishing reactors or electromagnets, and are used as inductance in circuits.
Existing.

このように種々の目的のために設けられる誘導コイルは
、その目的のためには有効であるが、第１図に示す界磁
遮断器りの遮断時や第２図に示すサイリスク素子７０転
流時等に電流が瞬時に変化する場合には、誘導コイルに
大きな過電圧が生ずる。このために、上記過電圧に対応
した保護装置が必要になる。特に、最近のように、）備
が大容量化される場合においては、この大容量化に従っ
て、上記過電圧の保護装置が大形化する。その結果、従
来の誘導コイルが組み込まれた設備は一経済的に高価に
なるという欠点を有していた。Although the induction coils provided for various purposes are effective for those purposes, they are used when shutting off the field circuit breaker shown in FIG. When the current changes instantaneously, a large overvoltage occurs in the induction coil. For this reason, a protection device corresponding to the above-mentioned overvoltage is required. Particularly, as has been the case recently, when the capacity of the overvoltage protection device is increased, the overvoltage protection device becomes larger as the capacity increases. As a result, equipment incorporating conventional induction coils has the drawback of being economically expensive.

本発明は、従来の誘導コイルにおける上記のような欠点
を解消し、回路上に発生するスイッチングサージのよう
な、インダクタンスの存在により発生する高周波過電圧
を低減させることを目的とするものである。The present invention aims to eliminate the above-mentioned drawbacks of conventional induction coils and reduce high-frequency overvoltage caused by the presence of inductance, such as switching surges that occur on a circuit.

本発明は、この目的を達成するために、誘導コイル自身
に大きな分布容量を生ずる手段を設けて所定の周波数特
性を付与し、これによって、上記高周波過電圧を低減す
ることを特徴とするものである。In order to achieve this object, the present invention is characterized in that the induction coil itself is provided with a means for generating a large distributed capacitance to impart a predetermined frequency characteristic, thereby reducing the above-mentioned high frequency overvoltage. .

以下１本発明をその一実施例を示す添付図面第３図及び
第を図に基づいて説明する。The present invention will be explained below with reference to the accompanying drawings 3 and 3 showing one embodiment thereof.

第３図において、符号ｌθは誘導コイルであり、第４図
はこの誘導コイル１０の一部の詳細図である。この誘導
コイルＩＯは、その導体／／の周囲に、コイルターン間
の分布容量を増加させる手段としての高い分布容量を発
生する部材、例えば。In FIG. 3, the symbol lθ is an induction coil, and FIG. 4 is a detailed view of a part of this induction coil 10. This induction coil IO has a member, e.g., which generates a high distributed capacitance around its conductor // as a means of increasing the distributed capacitance between the coil turns.

図示されていない金属箔が包み込まれている金属箔入り
フィルム／コがデープ状に形成゛されて巻回されている
。この金属箔入りフィルムテープ１２のフィルムは、例
えば、厚さ数１０μｍのボリイミよ ドフイルムに１９構成され、その中に前記のように金属
箔が包み込まれている。このように構成された金属箔入
９にムテープ／λが導体／／に複数回巻回されている。A metal foil-containing film, in which a metal foil (not shown) is wrapped, is formed into a deep shape and wound. The film of this metal foil-containing film tape 12 is, for example, composed of a polyimide film 19 having a thickness of several tens of micrometers, and the metal foil is wrapped therein as described above. Mutape /λ is wound around the conductor // a plurality of times around the metal foil insert 9 constructed as described above.

従って、金属箔入りフィルムテープ１２中の金属箔は、
導体／／とは直接っながるごとはなく、従って、誘導コ
イルとは別の回路を形成することになる。このような金
属箔入りフィルムテープ／２は、誘導コイルＩＱ全体に
連続した１個の金属箔入りフィルムテープとする必要は
ない。しかし、各個の金属箔入りフィルムテープは、少
なくとも、複数のコイルターンにまたがって、回巻され
ていることが望ましい。すなわち、金属箔入りフィルム
テープ／２は、誘導コイルｎに対して、複数の金属箔入
りフィルムテープ１２を使用して構成しても、なんら差
し支えない。Therefore, the metal foil in the metal foil-containing film tape 12 is
It is not directly connected to the conductor //, and therefore forms a circuit separate from the induction coil. Such metal foil-containing film tape/2 does not need to be one continuous metal foil-containing film tape over the entire induction coil IQ. However, it is desirable that each metal foil-containing film tape be wound at least over a plurality of coil turns. That is, the metal foil-containing film tape/2 may be configured by using a plurality of metal foil-containing film tapes 12 for the induction coil n without any problem.

このように構成された誘導コイルＩθは、金属箔入りフ
ィルムテープ／、２．と、巻回された導体／ｌとによっ
て、添付図面第り図に示すような等価回路が形成される
ことになる。この等価回路は、コイルインダククンス／
３と分布容量ｌりとにヨリ構成され、このために、誘導
コイル／θ自身で周波数特性を有し、且つ、この誘導コ
イル自身で、一種の低域フィルターを形成することにな
る。The induction coil Iθ configured in this way is made of a metal foil-containing film tape/2. and the wound conductor /l form an equivalent circuit as shown in Figure 2 of the attached drawings. This equivalent circuit is the coil inductance/
Therefore, the induction coil /θ itself has a frequency characteristic, and this induction coil itself forms a kind of low-pass filter.

上記の説明は、一般的な誘導コイルを使用するりアクド
ルを例にとって説明したが、上記の例に限らず、コイル
そのものに周波数特性を持たせることにより、本来の役
目は維持しながら、サージ電圧等の低減を図ると云う目
的に対応するものでるものである。The above explanation uses a general induction coil and uses an accelerator as an example, but it is not limited to the above example. By giving the coil itself a frequency characteristic, it can suppress surge voltage while maintaining its original role. This corresponds to the purpose of reducing the

また、コイルターン間が密着しているものにおいては、
コイルターン間の分布秤量を増加する手段として、誘導
コイルの導体表面に被色される絶縁物を、高比誘電率を
有する絶、続物とすること（ｆこより、本発明を構成す
ることもできる。In addition, for coil turns that are in close contact with each other,
As a means of increasing the distributed weight between coil turns, the insulating material coated on the conductor surface of the induction coil is made of an insulating material having a high dielectric constant (this also constitutes the present invention). can.

以下に、例をとって、これを説明する。This will be explained below using an example.

いま、フィルターン間の絶縁物として、高比誘電率を有
する絶縁物、例えば、強誘電性セラミックスヲ充当する
ことにより、コイルクーン間ノキャパシタンスを増加す
ることが可能である。Now, it is possible to increase the capacitance between the coil coils by using an insulator having a high dielectric constant, for example, ferroelectric ceramic, as the insulator between the filter rings.

一般にフィルターン間の単位面積小たりのキャパシタン
ス番ま次式で表わさ第１．る。In general, the capacitance per unit area between filter bands is expressed by the following equation: 1. Ru.

／ Ｃ−一・ε・６０　　ファラッド δ ただし、Ｃ−フィルターン間のノー′Ｌ位面積当たりの
キャパシタンス、 δエコイルターフ間の絶ｔｆＭ物の１７さ。/ C-1・ε・60 Farad δ However, the capacitance per no'L area between C and filtern, δ is 17 of absolute tfM between echo coil turf.

εＣ−空気中の誘電率 ε＝絶縁物の比誘電率、 通常の絶縁物においては、その誘電率は１０程度以下で
ある。また、キャパシタンスを増加する手段どしては、
絶縁物の厚さを薄くする方法もあるが、フィルターン間
電圧の大きさによって、絶縁物の厚さは制限を受けろ。εC - Dielectric constant in air ε = Relative dielectric constant of an insulator In a normal insulator, the dielectric constant is about 10 or less. Also, as a means of increasing capacitance,
There is a way to reduce the thickness of the insulator, but the thickness of the insulator is limited by the magnitude of the voltage between the filters.

これに対して、強誘電性セラミックスを絶縁物に使用し
た場合には、その誘電率を１通常のＰ続物の誘電率に対
して７０倍から／θθ倍程度にまで上げることができる
。On the other hand, when ferroelectric ceramics are used as an insulator, the dielectric constant can be increased to about 70 times to /θθ times the dielectric constant of a normal P-conductor.

従って、コイルターン間のキャパシタ／メモ太キ（」−
列し、そゐ結果、コイルターン間の分布容量を増太さぜ
ることかできろ。Therefore, the capacitor/memory key (''-
As a result, the distributed capacitance between the coil turns can be increased.

また、第１／図に示した実施例に帖いては、コイルター
ン間の分布容量を増加させる手段とｌ〜ての高い分布容
量を発生する部材として、誘導コイルの置体にテープ状
の金属箔入りフィルムを巻装した例について説、明した
が、テープ状に限る必要はなく、シート状やラッパ状の
金属箔入りフィルムを部分的に設けてイ）よく、また、
高い分布容量を発生する部材として、金属溶着フィルム
を当ててもよく、更には、誘導コイルの一部をその表面
が絶縁性の酸化物によって構成されているコイルに変え
ることによっても、上記実施例と同様な効果を奏するこ
とができる。In addition, in the embodiment shown in Figure 1, a tape-shaped metal tape is used as a means for increasing the distributed capacitance between the coil turns and as a member for generating a high distributed capacitance. Although we have described and explained an example in which a foil-filled film is wrapped, it is not necessary to limit it to a tape-like shape, and a sheet-like or wrapper-like metal foil-filled film may be partially provided.
A metal welded film may be applied as a member that generates a high distributed capacitance, or a part of the induction coil may be replaced with a coil whose surface is made of an insulating oxide. The same effect can be achieved.

本発明の誘導コイルは、以上のように、誘導コイルのコ
イルターン間の分布容量を増大させて誘導コイルに周波
数特性を持たせたために、わずかす費用の付加によって
、このインダクタンスの存在により発生するエネルギー
の蓄積の結果であるサージ電圧を有効に低減することが
できる効果が得られ、また、これと合わせて、例えば、
スイッチング回路に特別な保護装置を設ける必要もなく
なり、その結果、設備の大容量化に際しても、低廉な設
備が得られるなどの多くの効果が得られる。As described above, the induction coil of the present invention increases the distributed capacitance between the coil turns of the induction coil and gives the induction coil a frequency characteristic. The effect of effectively reducing surge voltage that is a result of energy accumulation is obtained, and in conjunction with this, for example,
There is no need to provide a special protection device to the switching circuit, and as a result, many effects such as inexpensive equipment can be obtained even when the capacity of the equipment is increased.

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

第１図は直流電源設備を示す結線図、第一図はサイリス
ク回路図、第３図は本発明の一実施例である誘導コイル
の斜視図、第弘図は第３図に示した誘導コイルの一部拡
大説明斜視図、第５図は第３図の誘導コイルの等価回路
図である。 １０・・誘導コイル、ｌ／・・導体、／、２・・高い分
布容量を発生する部材（金属箔入りフィルムチーブ）。 なお、各図中、同一符号は同−又は相当部分を示す。 代理人　　大　岩　増　雄 幣１図 ゝ５ 尾２図Fig. 1 is a wiring diagram showing the DC power supply equipment, Fig. 1 is a SIRISC circuit diagram, Fig. 3 is a perspective view of an induction coil which is an embodiment of the present invention, and Fig. 3 is a diagram showing the induction coil shown in Fig. 3. FIG. 5 is an equivalent circuit diagram of the induction coil shown in FIG. 3. 10...Induction coil, l/...Conductor, /, 2...Member that generates high distributed capacitance (film chip containing metal foil). In each figure, the same reference numerals indicate the same or corresponding parts. Agent Masu Oiwa Yuhei Figure 1, Figure 5, Figure 2

Claims (1)

【特許請求の範囲】 （１）　　コイルターン間の分布容量を増加する手段を
施して所定の周波性特性を持たせたことを特徴とする誘
導コイル。 （，２）　　フィルターン間の分布容量を増加する手段
が、誘導コイルの導体の周囲に高い分布容量を発生する
部材を配設して成る特許請求の範囲第１項記載の誘導コ
イル。 （３）　　高い分布容量を発生する部材が、金属箔入り
フィルムであり、配設が巻装である特許請求の範囲第コ
項記載の誘導コイル。 （り）　　金属箔入りフィルムが、少なくとも一部がテ
ープ状に形成されている特許請求の範囲第３項記載の誘
導コイル。 （り）金属箔入りフィルムが、少なくとも一部がシート
状に形成されている特許請求の範囲第３項記載の誘導コ
イル。 （＆）　　金属箔入りフィルムが、少なくとも一部がラ
ッパ状に形成されている特許請求の範囲第３項記載の誘
導コイル。 （７）高い分布容量を発生する部材が、金属溶着フィル
ムであり、配設が巻装である特許請求の範囲第２項記載
の誘導コイル。 （ざ）　高い分布容量を発生する部材が、誘導コイル全
体にわたって１個の部利から構成されている特許請求の
範囲第３項ないし第７項のいずれかに記載の該導コイル
。 （９）高い分布、容量を発生する部材が、複数個から成
り、且つ、その各個の部材の＠装が、少なくともコイル
ターン間にまたがって巻装されている特許請求の範囲第
３項ないし第７項のいずれかに記載の誘導コイル。 （凋　コイルターン間の分布容量を増加する手段が、誘
導コイルの導体表面に被ωされる絶縁物を、高比誘電率
を有する絶縁物により構成することにより成る特許請求
の範囲第１項記載の誘導コイル。 （〃）高比誘電率を有する絶縁物が、強誘電性セラミッ
クスである特許請求の範囲第１θ項記載の誘導コイル。 （／２）　　コイルターン間の分布容量を増加する手段
が、コイルの一部を、その表面が絶縁性の酸化物から成
るコイルによって構成することにより成る特許請求の範
囲第′１項記載の誘導コイル。[Scope of Claims] (1) An induction coil characterized in that it has a predetermined frequency characteristic by applying means for increasing distributed capacitance between coil turns. (, 2) The induction coil according to claim 1, wherein the means for increasing the distributed capacitance between the filters comprises a member that generates a high distributed capacitance around the conductor of the induction coil. (3) The induction coil according to claim 1, wherein the member that generates a high distributed capacitance is a metal foil-containing film, and the induction coil is wound. (i) The induction coil according to claim 3, wherein at least a portion of the metal foil-containing film is formed into a tape shape. (i) The induction coil according to claim 3, wherein at least a portion of the metal foil-containing film is formed in a sheet shape. (&) The induction coil according to claim 3, wherein at least a portion of the metal foil-containing film is formed in a trumpet shape. (7) The induction coil according to claim 2, wherein the member that generates a high distributed capacity is a metal welded film and is arranged in a winding manner. (1) The induction coil according to any one of claims 3 to 7, wherein the member generating high distributed capacitance is constituted by a single part over the entire induction coil. (9) Claims 3 through 3, wherein the member that generates high distribution and capacity is composed of a plurality of members, and each member is wound at least between coil turns. The induction coil according to any one of Item 7. ((凋) The means for increasing the distributed capacitance between the coil turns is characterized in that the insulating material coated on the conductor surface of the induction coil is made of an insulating material having a high relative permittivity. An induction coil according to claim 1θ, wherein the insulator having a high dielectric constant is a ferroelectric ceramic. (/2) The means for increasing the distributed capacitance between the coil turns is 2. An induction coil according to claim 1, wherein a part of the coil is constituted by a coil whose surface is made of an insulating oxide.
JP58074252A 1983-03-01 1983-04-25 Induction coil Pending JPS59198705A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP58074252A JPS59198705A (en) 1983-04-25 1983-04-25 Induction coil
EP84301355A EP0117764A1 (en) 1983-03-01 1984-03-01 Coil device
US06/816,957 US4750077A (en) 1983-03-01 1986-01-06 Coil device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP58074252A JPS59198705A (en) 1983-04-25 1983-04-25 Induction coil

Publications (1)

Publication Number Publication Date
JPS59198705A true JPS59198705A (en) 1984-11-10

Family

ID=13541776

Family Applications (1)

Application Number Title Priority Date Filing Date
JP58074252A Pending JPS59198705A (en) 1983-03-01 1983-04-25 Induction coil

Country Status (1)

Country Link
JP (1) JPS59198705A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101079823B1 (en) 2011-08-25 2011-11-03 썬덴코리아 주식회사 Transformer for protecting from thunderbolt and electromagnetic noise using metal-tape with directional magnetic pole of molecular magnet

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5671914A (en) * 1979-11-19 1981-06-15 Toshiba Corp Induction apparatus winding
JPS5740812A (en) * 1980-08-25 1982-03-06 Ngk Spark Plug Co Noise suppressing wire wound resistance wire

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5671914A (en) * 1979-11-19 1981-06-15 Toshiba Corp Induction apparatus winding
JPS5740812A (en) * 1980-08-25 1982-03-06 Ngk Spark Plug Co Noise suppressing wire wound resistance wire

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101079823B1 (en) 2011-08-25 2011-11-03 썬덴코리아 주식회사 Transformer for protecting from thunderbolt and electromagnetic noise using metal-tape with directional magnetic pole of molecular magnet

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