JP3826318B2 - Saturable inductor with open magnetic circuit - Google Patents
Saturable inductor with open magnetic circuit Download PDFInfo
- Publication number
- JP3826318B2 JP3826318B2 JP06920898A JP6920898A JP3826318B2 JP 3826318 B2 JP3826318 B2 JP 3826318B2 JP 06920898 A JP06920898 A JP 06920898A JP 6920898 A JP6920898 A JP 6920898A JP 3826318 B2 JP3826318 B2 JP 3826318B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic core
- magnetic
- saturable inductor
- winding
- magnetic circuit
- 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 - Lifetime
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- 230000005291 magnetic effect Effects 0.000 title claims description 46
- 238000004804 winding Methods 0.000 claims description 15
- 230000035699 permeability Effects 0.000 claims description 6
- 239000000696 magnetic material Substances 0.000 claims description 3
- 230000004907 flux Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 229920000742 Cotton Polymers 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Images
Landscapes
- Coils Or Transformers For Communication (AREA)
Description
【０００１】
【産業上の利用分野】
本発明は、インダクタに関し、より具体的には可飽和インダクタに関する。
【０００２】
【従来の技術】
可飽和インダクタは、飽和するまでは無限に大きいインダクタンスを持ち、飽和後はゼロオームに近い特性を示すのが理想である。この理想に近づけるために透磁率と飽和磁束密度の値がいずれも高く、角型比が１に近く、そして保磁力の小さい磁性材を用いて、なるべく磁路長が短く断面積の大きい形にした磁心が用いられている。
【０００３】
その理由は、透磁率が高い程、断面積が大きい程、また、磁路長が短い程大きいインダクタンスが得られるということと、飽和磁束密度が高くて角型比が１に近い程電圧時間積が大きいからである。
【０００４】
電圧時間積とは、可飽和インダクタにパルスを印加するとき、印加直後から飽和するまでのパルスの電圧の値を時間積分したものである。この電圧時間積ＶＳ（ボルト秒）は飽和磁束密度をＢｍ（テスラ）、巻数をｎ（回）、磁心の断面積をＡ（ｍ２）、角型比をｂとすると、次の数１で表すことができる。式が示しているように飽和磁束密度が高くて角型比が１に近い程電圧時間積が大きくなる。
【０００５】
【数１】
また、数１が示しているように電圧時間積は巻数と断面積の積に比例するので巻数が多ければ断面積が小さくて済み、断面積が大きければ巻数は少なくて済む。
【０００７】
また、透磁率と角型比は磁心の磁路に空気によるギャップが存在すると特性が悪くなるため、磁心はギャップのないリング状に加工されている。
【０００８】
【発明が解決しようとする課題】
ギャップのないリンク状の磁心の巻線加工は、ボビンを回転させて巻く方法に比べて時間がかかる。そこで、断面積の大きいコアを用いることによって巻線の巻数を減らす方が生産性が良い。
【０００９】
しかし、可飽和インダクタの磁心にはアモルファス構造や微細結晶化された強磁性体の合金が用いられているので、断面積の大きい磁心を使うと材料コストが高くなる。
【００１０】
そこで本発明は、巻線の加工コストと材料コストの両方を削減することができ、かつ、従来の可飽和インダクタと同じレベルの特性が得られる方法を提供することを目的としている。
【００１１】
【課題を解決するための手段】
上記目的を達成するため本発明は、繊維状でその直径に対して長さの割合が、ある値を越えた磁心はまっすぐのばして用いても、又リング状にして用いても、巻線の巻数が同じであればインダクタンスがそれ程変わらないことに着目し、磁心を断面積が小さくて細長い形状に加工し、その一方の端から他方の端まで電線を巻き付けてこれを巻線とした。
【００１２】
【作用】
磁心の比透磁率をμ１、断面積をＡ（ｍ２）、長さをｌ１（ｍ）とし、空気によるギャップの長さをｌ０（ｍ）、空気の透磁率をμ０（Ｈ／ｍ）、ギャップにおける磁束の漏洩率をαとし、巻線の巻数をｎ（回）とすると、この巻線のインダクタンスＬ（Ｈ）は次の数２で表すことができる。
【００１３】
【数２】
数２において、ｌ０をゼロにしたとき、インダクタンスはギャップのないリング状の磁心の値になる。
【００１５】
漏洩率αは、磁心の形状が細長い程小さくなるので、断面積に対する長さの割合がある値を越えると、α・μ・ｌ０がｌ１に対して十分小さくなり、インダクタンスを求める式は、ｌ０がゼロのときに求める式とほぼ一致する。すなわち、磁心を細長い形状にし、その磁心の一方の端から他方の端に巻線を巻くと、等価的に磁路長が等しいリング状の磁心に巻いたときと同じ結果が得られる。
【００１６】
従来の閉磁路の可飽和インダクタにおいて磁路に小さなギャップが存在すると角形比が小さくなるが、本発明の可飽和インダクタは開磁路であるにもかかわらず、ギャップがゼロのときの角型比に近い値が得られる。
【００１７】
【実施例】
図１は、本発明の一実施例に係る開磁路の可飽和インダクタを示す図である。図において、磁心１は直径が０．１２５ｍｍ、長さが１００ｍｍのコバルトを主原料としたアモルファス合金であり、巻線は磁心の両端より５ｍｍ内側に入ったところから直径が０．１ｍｍのウレタン被膜導線が密巻きされている。
【００１８】
図１の実施例の可飽和インダクタは、角型比が０．７７、インダクタンスが２３０μＨの特性を示した。これらの特性は同じ材料を用いた体積比にして５０倍に近いリング状の磁心に巻線を４回巻いたものに近い結果であった。
【００１９】
【発明の効果】
細長い繊維状の磁心に巻線を行う技術はナイロン繊維に木綿繊維を巻き付ける、織物工場でよく用いられている技術の応用が可能であり、高速でしかも低コストで行うことができる。また、磁心に用いる材料が少なくて済むので材料コストを減らすことができる。
【図面の簡単な説明】
【図１】本発明の一実施例に係る可飽和インダクタを示す図である。
【図２】従来の可飽和インダクタの一例を示す回路図である。
【符号の説明】
１ 磁心
２ 巻き線[0001]
[Industrial application fields]
The present invention relates to inductors, and more particularly to saturable inductors.
[0002]
[Prior art]
Ideally, a saturable inductor has an infinitely large inductance until saturation, and exhibits characteristics close to zero ohms after saturation. In order to approach this ideal, the magnetic permeability and saturation magnetic flux density are both high, the squareness ratio is close to 1, and a magnetic material with a small coercive force is used so that the magnetic path length is as short as possible and the cross-sectional area is large. Magnetic cores are used.
[0003]
The reason is that the higher the magnetic permeability, the larger the cross-sectional area, and the shorter the magnetic path length, the larger the inductance, and the higher the saturation magnetic flux density and the closer the squareness ratio is to 1, the voltage-time product. Because is big.
[0004]
The voltage-time product is obtained by time integration of the voltage value of a pulse from when it is applied to the saturable inductor to when it is saturated. This voltage time product VS (volt second) is expressed by the following
[0005]
[Expression 1]
Further, as shown in
[0007]
Further, the magnetic permeability and the squareness ratio are deteriorated when a gap due to air exists in the magnetic path of the magnetic core. Therefore, the magnetic core is processed into a ring shape without a gap.
[0008]
[Problems to be solved by the invention]
Winding a link-like magnetic core without a gap takes time compared to a method of winding a bobbin by rotating it. Therefore, productivity is better when the number of windings is reduced by using a core having a large cross-sectional area.
[0009]
However, the magnetic core of the saturable inductor uses an amorphous structure or a finely crystallized ferromagnetic alloy. Therefore, the use of a magnetic core having a large cross-sectional area increases the material cost.
[0010]
Accordingly, an object of the present invention is to provide a method that can reduce both the machining cost and the material cost of the winding and can obtain the same level of characteristics as a conventional saturable inductor.
[0011]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a magnetic core whose length ratio with respect to its diameter exceeds a certain value . Focusing on the fact that the inductance does not change much if the number of turns is the same, the magnetic core is processed into a long and narrow shape with a small cross-sectional area, and an electric wire is wound from one end to the other end to form a winding.
[0012]
[Action]
The relative permeability of the magnetic core is μ1, the cross-sectional area is A (m 2 ), the length is 11 (m), the length of the air gap is 10 (m), the air permeability is μ0 (H / m), If the leakage rate of magnetic flux in the gap is α and the number of turns of the winding is n (times), the inductance L (H) of this winding can be expressed by the following
[0013]
[Expression 2]
In
[0015]
Since the leakage rate α becomes smaller as the shape of the magnetic core becomes elongated, when the ratio of the length to the cross-sectional area exceeds a certain value, α · μ · l0 becomes sufficiently smaller than l1, and the equation for obtaining the inductance is l0. This is almost the same as the equation obtained when is zero. That is, when the magnetic core is formed into an elongated shape and a winding is wound from one end of the magnetic core to the other end, the same result as that obtained when the magnetic core is wound around a ring-shaped magnetic core having an equivalent magnetic path length is obtained.
[0016]
In a conventional saturable inductor having a closed magnetic circuit, the squareness ratio is reduced when a small gap exists in the magnetic path. However, the saturable inductor of the present invention has a squareness ratio when the gap is zero even though the saturable inductor is an open magnetic circuit. A value close to is obtained.
[0017]
【Example】
FIG. 1 is a diagram illustrating a saturable inductor having an open magnetic circuit according to an embodiment of the present invention. In the figure, the
[0018]
The saturable inductor of the example of FIG. 1 exhibited characteristics with a squareness ratio of 0.77 and an inductance of 230 μH. These characteristics were close to those obtained by winding the winding four times on a ring-shaped magnetic core nearly 50 times in volume ratio using the same material.
[0019]
【The invention's effect】
As a technique for winding an elongated fiber-shaped magnetic core, a technique often used in a textile factory, in which a cotton fiber is wound around a nylon fiber, can be applied, and it can be performed at a high speed and at a low cost. Further, since the material used for the magnetic core is small, the material cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a saturable inductor according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing an example of a conventional saturable inductor.
[Explanation of symbols]
1
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06920898A JP3826318B2 (en) | 1998-02-12 | 1998-02-12 | Saturable inductor with open magnetic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP06920898A JP3826318B2 (en) | 1998-02-12 | 1998-02-12 | Saturable inductor with open magnetic circuit |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| JPH11233346A JPH11233346A (en) | 1999-08-27 |
| JPH11233346A5 JPH11233346A5 (en) | 2004-08-26 |
| JP3826318B2 true JP3826318B2 (en) | 2006-09-27 |
Family
ID=13396087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP06920898A Expired - Lifetime JP3826318B2 (en) | 1998-02-12 | 1998-02-12 | Saturable inductor with open magnetic circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3826318B2 (en) |
-
1998
- 1998-02-12 JP JP06920898A patent/JP3826318B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11233346A (en) | 1999-08-27 |
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