JP5930455B2 - Sample table for core loss measuring device, core loss measuring device - Google Patents
Sample table for core loss measuring device, core loss measuring device Download PDFInfo
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- 238000004804 winding Methods 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 19
- 230000005284 excitation Effects 0.000 claims description 12
- 239000011810 insulating material Substances 0.000 claims description 5
- 239000011162 core material Substances 0.000 description 126
- 238000002474 experimental method Methods 0.000 description 39
- 238000005259 measurement Methods 0.000 description 30
- 230000004907 flux Effects 0.000 description 18
- 230000003071 parasitic effect Effects 0.000 description 18
- 239000000696 magnetic material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005670 electromagnetic radiation Effects 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 240000001973 Ficus microcarpa Species 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Description
本発明は、コイル部品のコア材のコアロスを測定するコアロス測定装置、該コアロス測定装置に用いられる試料台に関する。 The present invention relates to a core loss measuring device for measuring a core loss of a core material of a coil component, and a sample table used in the core loss measuring device.
産業機器や家電機器の基幹部品である電源トランス、モーター、チョークコイルなどのコイル部品は、コア材として軟磁性体等の磁性体が用いられている（例えば特許文献１を参照）。このようなコイル部品においては、電力損失であるコアロスが問題となる場合がある。ここでコアロスとは、磁性材料からなるコア材そのもので失われる電気エネルギーであり、ヒステリシス損、渦電流損、残留損を含む。したがって上記のようなコイル部品においてコアロスは、可能な限り小さい方が良いのは言うまでもない。そして近年は、軟磁性体コア材のコアロスを低減する技術が進歩するのに伴い、微小なコアロスを高精度に測定可能なコアロス測定装置のニーズが高まりつつある。 Coil parts such as power transformers, motors, and choke coils, which are basic parts of industrial equipment and home appliances, use a magnetic material such as a soft magnetic material as a core material (see, for example, Patent Document 1). In such a coil component, a core loss that is a power loss may be a problem. Here, the core loss is electric energy lost in the core material itself made of a magnetic material, and includes hysteresis loss, eddy current loss, and residual loss. Therefore, it goes without saying that the core loss in the coil component as described above should be as small as possible. In recent years, the need for a core loss measuring apparatus capable of measuring a minute core loss with high accuracy is increasing as the technology for reducing the core loss of the soft magnetic core material advances.
以下、コアロス測定装置の従来技術の一例とその課題について、図１１、図１２を参照しながら説明する。
図１１は、従来技術のコアロス測定装置１００の試料台１０Ｐの斜視図である。図１２は、従来技術のコアロス測定装置１００の要部を図示した概略構成図である。
Hereinafter, an example of the prior art of the core loss measuring apparatus and its problems will be described with reference to FIGS. 11 and 12.
FIG. 11 is a perspective view of the sample stage 10P of the core loss measuring apparatus 100 of the prior art. FIG. 12 is a schematic configuration diagram illustrating the main part of the core loss measuring apparatus 100 of the prior art.
コアロスの被測定対象である公知のトロイダルコイル５０は、軟磁性体コア５１、一次巻線５２及び二次巻線５３を含む。測定試料としての軟磁性体コア５１は、軟磁性材料を所謂トロイダル形状に加工して形成したものである。一次巻線５２は巻線数Ｎ１で軟磁性体コア５１に巻かれている。二次巻線５３は巻線数Ｎ２で軟磁性体コア５１に巻かれている。 A known toroidal coil 50 that is an object to be measured for core loss includes a soft magnetic core 51, a primary winding 52, and a secondary winding 53. The soft magnetic core 51 as a measurement sample is formed by processing a soft magnetic material into a so-called toroidal shape. The primary winding 52 is wound around the soft magnetic core 51 with the number of windings N1. The secondary winding 53 is wound around the soft magnetic core 51 with the number of windings N2.
コアロス測定装置１００は、試料台１０Ｐ、信号発生器２０、第１電圧測定回路３０、第２電圧測定回路４０及びシャント抵抗３１を備える。 The core loss measuring apparatus 100 includes a sample stage 10P, a signal generator 20, a first voltage measuring circuit 30, a second voltage measuring circuit 40, and a shunt resistor 31.
コアロス測定装置１００の試料台１０Ｐは、トロイダルコイル５０を支持する台であり、筐体１１、試料テーブル１２、４つの端子１３〜１６を含む。筐体１１は、略直方体形状をなし、電磁放射及び磁化による測定値への影響を防止するため非磁性金属で形成されている。筐体１１の上面に配置される試料テーブル１２は、トロイダルコイル５０を載置する薄板状の部材であり、トロイダルコイル５０の巻線と筐体１１との電気的絶縁を確実にするため樹脂等の絶縁性を有する材料で形成されている。４つの端子１３〜１６は、トロイダルコイル５０の一次巻線５２及び二次巻線５３の端部を信号発生器２０、第１電圧測定回路３０及び第２電圧測定回路４０に電気的に接続するために設けられている。より具体的には端子１３、１４には、一次巻線５２の両端が接続され、端子１５、１６には、二次巻線５３の両端が接続される。 The sample table 10P of the core loss measuring apparatus 100 is a table that supports the toroidal coil 50, and includes a housing 11, a sample table 12, and four terminals 13 to 16. The casing 11 has a substantially rectangular parallelepiped shape, and is formed of a nonmagnetic metal in order to prevent influence on measurement values due to electromagnetic radiation and magnetization. The sample table 12 disposed on the upper surface of the housing 11 is a thin plate-like member on which the toroidal coil 50 is placed, and a resin or the like is used to ensure electrical insulation between the winding of the toroidal coil 50 and the housing 11. It is formed with the material which has the insulating property. The four terminals 13 to 16 electrically connect the ends of the primary winding 52 and the secondary winding 53 of the toroidal coil 50 to the signal generator 20, the first voltage measurement circuit 30, and the second voltage measurement circuit 40. It is provided for. More specifically, both ends of the primary winding 52 are connected to the terminals 13 and 14, and both ends of the secondary winding 53 are connected to the terminals 15 and 16.
信号発生器２０は、シャント抵抗３１を介して端子１３、１４に接続されており、トロイダルコイル５０の一次巻線５２に周期Ｔの正弦波の励磁電流（交流電流）Ｉ１を流す。シャント抵抗３１は、抵抗値Ｒｓの抵抗器であり、一次巻線５２に流れる励磁電流Ｉ１を電圧Ｖｓに変換する。第１電圧測定回路３０は、その電圧Ｖｓ（シャント抵抗３１の両端の電位差）を測定する回路であり、シャント抵抗３１の両端に接続されている。第２電圧測定回路４０は、端子１５、１６に接続されており、トロイダルコイル５０の二次巻線５３に生ずる誘起電圧Ｖ２を測定する回路である。 The signal generator 20 is connected to the terminals 13 and 14 via the shunt resistor 31, and causes a sinusoidal excitation current (alternating current) I 1 having a period T to flow through the primary winding 52 of the toroidal coil 50. The shunt resistor 31 is a resistor having a resistance value Rs, and converts the exciting current I1 flowing through the primary winding 52 into a voltage Vs. The first voltage measurement circuit 30 is a circuit that measures the voltage Vs (potential difference between both ends of the shunt resistor 31), and is connected to both ends of the shunt resistor 31. The second voltage measurement circuit 40 is connected to the terminals 15 and 16 and is a circuit that measures the induced voltage V <b> 2 generated in the secondary winding 53 of the toroidal coil 50.
上記説明した構成のコアロス測定装置１００において、トロイダルコイル５０のコアロスは以下のようにして測定することができる。 In the core loss measuring apparatus 100 having the above-described configuration, the core loss of the toroidal coil 50 can be measured as follows.
まず信号発生器２０から周期Ｔの正弦波の励磁信号を発生させる。そして電圧Ｖｓを第１電圧測定回路３０で測定し、測定した電圧Ｖｓから以下の式（１）により、一次巻線５２に流れる励磁電流Ｉ１を算出する。
Ｉ１＝Ｖｓ／Ｒｓ …（１）
また二次巻線５３の両端に生じる誘起電圧Ｖ２を第２電圧測定回路４０で測定し、測定した誘起電圧Ｖ２、一次巻線５２の巻線数Ｎ１、二次巻線５３の巻線数Ｎ２から以下の式（２）により、一次巻線５２のインダクタンス分に加わる電圧Ｖ１を算出する。
Ｖ１＝（Ｎ１／Ｎ２）Ｖ２ …（２）
トロイダルコイル５０のコアロスＰｃは、軟磁性体コア５１の電力損失であるから、上記の電圧Ｖ１、励磁電流Ｉ１及び励磁電流Ｉ１の周期Ｔを用いて以下の式（３）により算出することができる。
I1 = Vs / Rs (1)
The induced voltage V2 generated at both ends of the secondary winding 53 is measured by the second voltage measuring circuit 40, and the measured induced voltage V2, the number N1 of the primary winding 52, and the number N2 of the secondary winding 53 are measured. From the following equation (2), the voltage V1 applied to the inductance of the primary winding 52 is calculated.
V1 = (N1 / N2) V2 (2)
Since the core loss Pc of the toroidal coil 50 is a power loss of the soft magnetic core 51, it can be calculated by the following equation (3) using the voltage V1, the excitation current I1, and the period T of the excitation current I1. .
出願人は、コアロス測定装置の研究開発を鋭意行う過程で、従来技術のコアロス測定装置は、試料テーブルに対するコイル部品の配置が僅かに異なるだけでコアロスの測定値が大きく変動してしまう場合があるという課題を発見した。さらに出願人は、このコアロスの測定値の変動は、特にコアロスが小さいコイル部品において顕著となることも突き止めた。このようなコアロスの測定値の変動は、コアロス測定装置の測定精度を低下させる要因となり、特にコアロスが小さいコイル部品においては無視できない測定誤差を生じさせることになる。 In the course of earnestly conducting research and development of a core loss measuring device, the applicant may experience a large change in the measured value of the core loss even if the arrangement of the coil components on the sample table is slightly different. I found a problem. Furthermore, the applicant has also found that the fluctuation of the measured value of the core loss becomes remarkable particularly in a coil component having a small core loss. Such fluctuations in the measured value of the core loss cause a decrease in the measurement accuracy of the core loss measuring device, and in particular cause a measurement error that cannot be ignored in a coil component having a small core loss.
このような状況に鑑み本発明はなされたものであり、その目的は、試料テーブルに対するコイル部品の配置に左右されることなくコイル部品のコアロスを高精度に測定可能なコアロス測定装置を提供することにある。 The present invention has been made in view of such circumstances, and an object thereof is to provide a core loss measuring device capable of measuring the core loss of a coil component with high accuracy without being influenced by the arrangement of the coil component with respect to a sample table. It is in.
＜本発明の第１の態様＞
本発明の第１の態様は、非磁性金属で形成された筐体と、絶縁性を有する材料で形成され、前記筐体の上面に配置される試料テーブルと、を備え、前記筐体は、前記試料テーブルが配置される領域に凹部が形成されている、ことを特徴とするコアロス測定装置の試料台である。
このような特徴によれば、非磁性金属の筐体で発生する寄生渦電流損（後述）を低減することができるので、試料テーブルに対するコイル部品の配置に左右されることなくコイル部品のコアロスを高精度に測定することができる。
<First Aspect of the Present Invention>
A first aspect of the present invention includes a housing formed of a nonmagnetic metal, and a sample table formed of an insulating material and disposed on an upper surface of the housing. The sample table of the core loss measuring apparatus is characterized in that a recess is formed in a region where the sample table is arranged.
According to such a feature, since the parasitic eddy current loss (described later) generated in the nonmagnetic metal casing can be reduced, the core loss of the coil component can be reduced without being influenced by the arrangement of the coil component with respect to the sample table. It can be measured with high accuracy.
＜本発明の第２の態様＞
本発明の第２の態様は、前述した本発明の第１の態様において、前記筐体の凹部は、試料となるトロイダルコイルの直径より２０ｍｍ以上長い直径の円を包含する大きさで、かつ前記試料テーブルの上面から底面までの長さが１５ｍｍ以上となる深さで形成されている、ことを特徴とするコアロス測定装置の試料台である。
このような特徴によれば、非磁性金属の筐体で発生する寄生渦電流損（後述）をさらに低減することができるので、試料テーブルに対するコイル部品の配置に左右されることなくコイル部品のコアロスをより高精度に測定することができる。
<Second Aspect of the Present Invention>
According to a second aspect of the present invention, in the first aspect of the present invention described above, the recess of the housing has a size including a circle having a diameter that is 20 mm or more longer than the diameter of the toroidal coil serving as a sample, and The sample table of the core loss measuring apparatus is characterized in that the length from the upper surface to the bottom surface of the sample table is formed to a depth of 15 mm or more.
According to such a feature, the parasitic eddy current loss (described later) generated in the non-magnetic metal casing can be further reduced, so that the core loss of the coil component is not affected by the arrangement of the coil component with respect to the sample table. Can be measured with higher accuracy.
＜本発明の第３の態様＞
本発明の第３の態様は、絶縁性を有する材料で形成された筐体と、絶縁性を有する材料で形成され、前記筐体の上面に配置される試料テーブルと、を備えるコアロス測定装置の試料台である。
本発明の第３の態様によれば、筐体で発生する寄生渦電流損（後述）を低減することができるので、試料テーブルに対するコイル部品の配置に左右されることなくコイル部品のコアロスを高精度に測定することができる。
<Third Aspect of the Present Invention>
According to a third aspect of the present invention, there is provided a core loss measuring apparatus including: a housing formed of an insulating material; and a sample table formed of an insulating material and disposed on an upper surface of the housing. It is a sample stage.
According to the third aspect of the present invention, the parasitic eddy current loss (described later) generated in the housing can be reduced, so that the core loss of the coil component is increased without being influenced by the arrangement of the coil component with respect to the sample table. It can be measured with high accuracy.
＜本発明の第４の態様＞
本発明の第４の態様は、前述した本発明の第１〜第３の態様のいずれかにおいて、前記筐体に設けられた四つの端子をさらに備える、ことを特徴とするコアロス測定装置の試料台である。
このような特徴によれば、試料台に載置された試料とコアロス測定装置との電気的接続を容易に行うことができるので、コアロス測定装置の操作性を向上させることができる。
<Fourth aspect of the present invention>
A fourth aspect of the present invention is the core loss measuring apparatus sample according to any one of the first to third aspects of the present invention described above, further comprising four terminals provided on the casing. It is a stand.
According to such a feature, since the electrical connection between the sample placed on the sample stage and the core loss measuring device can be easily performed, the operability of the core loss measuring device can be improved.
＜本発明の第５の態様＞
本発明の第５の態様は、前述した本発明の第１〜第４の態様のいずれかに記載のコアロス測定装置の試料台と、試料となるトロイダルコイルの一次巻線にシャント抵抗を介して正弦波の励磁電流を流す信号発生器と、前記シャント抵抗の両端の電位差を測定する第１電圧測定回路と、試料となるトロイダルコイルの二次巻線に生ずる誘起電圧を測定する第２電圧測定回路と、を備えるコアロス測定装置である。
本発明の第５の態様によれば、コアロス測定装置において、前述した本発明の第１〜第４の態様のいずれかに記載の発明による作用効果を得ることができる。
<Fifth aspect of the present invention>
According to a fifth aspect of the present invention, there is provided a sample stage of the core loss measuring device according to any one of the first to fourth aspects of the present invention described above, and a primary winding of the toroidal coil as a sample via a shunt resistor. A signal generator for passing a sinusoidal excitation current, a first voltage measurement circuit for measuring a potential difference between both ends of the shunt resistor, and a second voltage measurement for measuring an induced voltage generated in a secondary winding of a toroidal coil as a sample. And a core loss measuring device.
According to the fifth aspect of the present invention, in the core loss measuring apparatus, it is possible to obtain the operational effects of the invention according to any one of the first to fourth aspects of the present invention described above.
本発明によれば、試料テーブルに対するコイル部品の配置に左右されることなくコイル部品のコアロスを高精度に測定可能なコアロス測定装置を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the core loss measuring apparatus which can measure the core loss of a coil component with high precision can be provided, without being influenced by arrangement | positioning of the coil component with respect to a sample table.
以下、本発明の実施の形態について図面を参照しながら説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
＜コアロス測定装置の試料台の構成＞
本発明に係るコアロス測定装置の試料台の構成について、図１、図２を参照しながら説明する。
図１は、本発明に係るコアロス測定装置の試料台１０の外観斜視図である。図２は、本発明に係るコアロス測定装置の試料台１０の筐体１１の側面図である。
<Configuration of sample stand of core loss measuring device>
The configuration of the sample stage of the core loss measuring apparatus according to the present invention will be described with reference to FIGS.
FIG. 1 is an external perspective view of a sample stage 10 of a core loss measuring apparatus according to the present invention. FIG. 2 is a side view of the housing 11 of the sample stage 10 of the core loss measuring apparatus according to the present invention.
本発明に係るコアロス測定装置の試料台１０（以下、単に「試料台１０」という。）は、「コイル部品」としてのトロイダルコイル５０を支持する台であり、筐体１１、試料テーブル１２、４つの端子１３〜１６を含む。ここで試料テーブル１２、４つの端子１３〜１６については、図１１に図示した従来技術のコアロス測定装置の試料台１０Ｐと同じ構成であるため、同じ符号を付して詳細な説明を省略する。 The sample table 10 (hereinafter simply referred to as “sample table 10”) of the core loss measuring apparatus according to the present invention is a table that supports a toroidal coil 50 as a “coil component”. Two terminals 13 to 16 are included. Here, since the sample table 12 and the four terminals 13 to 16 have the same configuration as the sample table 10P of the conventional core loss measuring apparatus shown in FIG. 11, the same reference numerals are given and detailed description is omitted.
本発明に係る試料台１０の筐体１１は、略直方体形状をなし、電磁放射及び磁化による測定値への影響を防止するため非磁性金属で形成されている点は、従来と同様である。そして本発明に係る試料台１０の筐体１１は、試料テーブル１２が配置される領域に凹部１７が形成されている点に従来にない特徴がある。凹部１７は、直径Ｄの大きさの円形開口を有する円形凹部である。また凹部１７は、筐体１１の上面から底面までの長さ（深さ）がＨに設定されている（以下、「深さＨ」という。）。
尚、コアロス測定装置の全体構成については、試料台１０の構成以外は図１２に図示した従来技術のコアロス測定装置１００と同じであるため、図示及び説明を省略する。
The case 11 of the sample stage 10 according to the present invention has a substantially rectangular parallelepiped shape and is formed of a nonmagnetic metal in order to prevent the influence of electromagnetic radiation and magnetization on the measured value, which is the same as in the past. And the housing | casing 11 of the sample stand 10 which concerns on this invention has the characteristics which are not in the past in the recessed part 17 being formed in the area | region where the sample table 12 is arrange | positioned. The recess 17 is a circular recess having a circular opening having a diameter D. The recess 17 has a length (depth) from the top surface to the bottom surface of the housing 11 set to H (hereinafter referred to as “depth H”).
The overall configuration of the core loss measuring apparatus is the same as that of the prior art core loss measuring apparatus 100 shown in FIG.
以下、本発明の技術的意義について、図３〜図９を参照しながら説明する。
図３は、トロイダルコイル５０の巻線方向の磁束を図示した斜視図である。図４は、トロイダルコイル５０の巻線方向に直交する方向の磁束を図示した斜視図である。図５は、１ターンコイルＬの巻線方向に直交する方向の磁束を図示した斜視図である。
The technical significance of the present invention will be described below with reference to FIGS.
FIG. 3 is a perspective view illustrating the magnetic flux in the winding direction of the toroidal coil 50. FIG. 4 is a perspective view illustrating the magnetic flux in the direction orthogonal to the winding direction of the toroidal coil 50. FIG. 5 is a perspective view illustrating the magnetic flux in the direction orthogonal to the winding direction of the one-turn coil L. FIG.
出願人は、鋭意研究を重ねた結果、試料テーブル１２に対するトロイダルコイル５０の配置が僅かに異なるだけでコアロスの測定値が大きく変動してしまう原因を解明した。以下、詳細に説明する。 As a result of intensive studies, the applicant has clarified the reason why the measured value of the core loss greatly fluctuates even if the arrangement of the toroidal coil 50 with respect to the sample table 12 is slightly different. Details will be described below.
コアロス測定装置１００（図１２）は、コアロス測定時にコイル部品から漏れ磁束があると、コアロス測定装置１００を含む周辺の金属に渦電流を発生させ、その渦電流損がコアロスに含まれて測定されてしまう。この渦電流損（以下、「寄生渦電流損」という。）は、コアの渦電流損ではないから、コアロスの測定値に含まれてはならない。そのためコアロス測定装置１００で測定する試料として一般的にトロイダルコイル５０が採用されている。トロイダルコイル５０は、磁路が閉じているため、一次巻線５２に流れる電流によって巻線方向の磁束Ａが生じ、漏れ磁束はほとんど生じないと従来考えられていたからである（図３）。 The core loss measuring device 100 (FIG. 12) generates an eddy current in the surrounding metal including the core loss measuring device 100 when there is a leakage magnetic flux from the coil component during the core loss measurement, and the eddy current loss is included in the core loss and measured. End up. This eddy current loss (hereinafter referred to as “parasitic eddy current loss”) is not the eddy current loss of the core, and therefore should not be included in the measured value of the core loss. Therefore, the toroidal coil 50 is generally employed as a sample to be measured by the core loss measuring apparatus 100. This is because, since the magnetic path of the toroidal coil 50 is closed, it has been conventionally considered that the magnetic flux A in the winding direction is generated by the current flowing through the primary winding 52 and that almost no leakage magnetic flux is generated (FIG. 3).
ところが漏れ磁束が生じないと従来考えられていたトロイダルコイルにおいて、出願人は、巻線方向と直交する方向の漏れ磁束Ｂ（以下、「垂直漏れ磁束Ｂ」という。）が発生する可能性があるとの知見を得るに至った（図４）。トロイダルコイル５０は、巻線方向に対して直交する方向から見ると、一次巻線５２及び二次巻線５３がそれぞれ１ターンだけ巻かれたコイルＬ（以下、「１ターンコイルＬ」という。）とみなすことができるからである（図５）。これは例えば軟磁性体コア５１の断面を無限小にしていくことを考えると理解しやすい。つまり従来技術の試料台１０Ｐ（図１１）を用いたコアロス測定装置１００は、トロイダルコイル５０の一次巻線５２に電流が流れた時にトロイダルコイル５０に発生する垂直漏れ磁束Ｂによって、試料テーブル１２の直下の非磁性金属の筐体１１で寄生渦電流損が生じ、この寄生渦電流損も含めてコアロスとして測定されてしまうことになる。 However, in a toroidal coil that has been conventionally considered that no leakage magnetic flux occurs, the applicant may generate a leakage magnetic flux B (hereinafter referred to as “vertical leakage magnetic flux B”) in a direction orthogonal to the winding direction. It came to obtain the knowledge (FIG. 4). When viewed from a direction orthogonal to the winding direction, the toroidal coil 50 is a coil L in which the primary winding 52 and the secondary winding 53 are each wound by one turn (hereinafter referred to as “one-turn coil L”). This is because (FIG. 5). This can be easily understood when considering, for example, making the cross section of the soft magnetic core 51 infinitely small. That is, the core loss measuring apparatus 100 using the prior art sample stage 10P (FIG. 11) uses the vertical leakage magnetic flux B generated in the toroidal coil 50 when a current flows through the primary winding 52 of the toroidal coil 50, so that the sample table 12 Parasitic eddy current loss occurs in the nonmagnetic metal casing 11 directly below, and this parasitic eddy current loss is also measured as core loss.
上記の仮説を検証するため、出願人は、平均直径（外径と内径の和の１／２の長さ。以下、同じ。）を３９ｍｍとし、コアロスＰｃが極めて小さいトロイダルコイル５０（具体的には、後述する実験用のトロイダルコイルＴＣ）及び１ターンコイルＬをそれぞれ作製した。そして従来技術の試料台１０Ｐとコアロス測定装置１００を用いて、両者のコアロスＰｃをそれぞれ測定して対比する実験を行った。具体的には、信号発生器２０から一次巻線５２に周波数１００ＫＨｚの正弦波の励磁電流０．５Ａを流してトロイダルコイル５０と１ターンコイルＬのコアロスＰｃをそれぞれ測定した。また両者の測定条件を同じにするため、１ターンコイルＬのコアロスＰｃの測定は、トロイダルコイル５０の平均高さ（高さの１／２の長さ。以下、同じ。）である５ｍｍだけ、試料テーブル１２から浮かせた状態で行った。 In order to verify the above hypothesis, the applicant made the toroidal coil 50 (specifically, the average diameter (the length of the sum of the outer diameter and the inner diameter ½, hereinafter the same)) 39 mm and the core loss Pc being extremely small. Produced a toroidal coil TC for experiments and a one-turn coil L, which will be described later. Then, using the sample stage 10P and the core loss measuring apparatus 100 of the prior art, an experiment for measuring and comparing the core loss Pc of both was performed. Specifically, the core loss Pc of the toroidal coil 50 and the one-turn coil L was measured by passing a sine wave excitation current of 0.5 A at a frequency of 100 KHz from the signal generator 20 to the primary winding 52. Moreover, in order to make both measurement conditions the same, the measurement of the core loss Pc of the one-turn coil L is only 5 mm, which is the average height of the toroidal coil 50 (1/2 the height, the same applies hereinafter). The test was performed while floating from the sample table 12.
測定結果は、トロイダルコイル５０のコアロスＰｃは1.30×10-4 Wであり、１ターンコイルＬのコアロスＰｃは1.35×10-4Wであった。つまり両者のコアロスＰｃは略同じ値であった。この測定結果は、垂直漏れ磁束Ｂだけに注目すれば、トロイダルコイル５０は１ターンコイルＬとみなせるという上記仮説が正しいことを意味する。つまり前記の通り、漏れ磁束がないと従来考えられていたトロイダルコイル５０においても実は垂直漏れ磁束Ｂが発生しているということである。 As a result of the measurement, the core loss Pc of the toroidal coil 50 was 1.30 × 10 −4 W, and the core loss Pc of the one-turn coil L was 1.35 × 10 −4 W. That is, both core losses Pc were substantially the same value. This measurement result means that the hypothesis that the toroidal coil 50 can be regarded as a one-turn coil L is correct if attention is paid only to the vertical leakage magnetic flux B. That is, as described above, the vertical leakage magnetic flux B is actually generated even in the toroidal coil 50 that has been conventionally considered to have no leakage magnetic flux.
このようなことから従来技術の試料台１０Ｐにおいては、試料テーブル１２に対するコイル部品の配置が異なると、トロイダルコイル５０から試料テーブル１２直下の非磁性金属の筐体１１までの距離が変わるため、筐体１１を貫く垂直漏れ磁束Ｂの大きさが変化し、それに従って寄生渦電流損も変化することになる。すなわち試料テーブル１２に対するトロイダルコイル５０の配置が僅かに異なるだけでコアロスＰｃの測定値が大きく変動するという従来技術の試料台１０Ｐの課題は、そのトロイダルコイル５０の配置が異なることによって筐体１１を貫く垂直漏れ磁束Ｂに起因する寄生渦電流損が変化するために生ずるという結論に至る。また寄生渦電流損は、コアロスが大きいトロイダルコイル５０であるほど、トロイダルコイル５０のコアロスに対して相対的に小さくなる。したがって上記結論は、試料テーブル１２に対するコイル部品の配置が異なることによるコアロスの測定値の変動が、特にコアロスが小さいコイル部品において顕著になるという現象とも整合することになる。 For this reason, in the sample stage 10P of the prior art, if the arrangement of the coil parts with respect to the sample table 12 is different, the distance from the toroidal coil 50 to the nonmagnetic metal case 11 directly under the sample table 12 changes. The magnitude of the vertical leakage flux B penetrating the body 11 changes, and the parasitic eddy current loss changes accordingly. That is, the problem of the prior art sample table 10P that the measured value of the core loss Pc varies greatly only by slightly different arrangement of the toroidal coil 50 with respect to the sample table 12 is that the casing 11 is made different by the arrangement of the toroidal coil 50 being different. The conclusion is reached that the parasitic eddy current loss due to the penetrating vertical leakage flux B occurs due to the change. Further, the parasitic eddy current loss becomes relatively smaller with respect to the core loss of the toroidal coil 50 as the core loss of the toroidal coil 50 is larger. Therefore, the above conclusion is consistent with the phenomenon that the variation of the measured value of the core loss due to the difference in the arrangement of the coil parts with respect to the sample table 12 becomes remarkable particularly in the coil parts having a small core loss.
本発明に係る試料台１０は、筐体１１の試料テーブル１２が配置される領域に凹部１７が形成されているので、非磁性金属の筐体１１から一定以上の間隔をもって離れた位置にトロイダルコイル５０を支持することができる。それによって非磁性金属の筐体１１で発生する寄生渦電流損を大幅に低減することができる。すなわち本発明に係る試料台１０によれば、非磁性金属の筐体１１で発生する寄生渦電流損を低減することができるので、試料テーブル１２に対するトロイダルコイル５０の配置に左右されることなくトロイダルコイル５０のコアロスを高精度に測定することができる。 In the sample table 10 according to the present invention, since the recess 17 is formed in the region of the housing 11 where the sample table 12 is disposed, the toroidal coil is located at a position spaced apart from the nonmagnetic metal housing 11 by a certain distance or more. 50 can be supported. Thereby, the parasitic eddy current loss generated in the nonmagnetic metal casing 11 can be greatly reduced. That is, according to the sample stage 10 according to the present invention, the parasitic eddy current loss generated in the nonmagnetic metal casing 11 can be reduced, so that the toroidal is not affected by the arrangement of the toroidal coil 50 with respect to the sample table 12. The core loss of the coil 50 can be measured with high accuracy.
本発明の効果を検証するため出願人は、以下説明する第１実験及び第２実験を行った。 In order to verify the effect of the present invention, the applicant conducted a first experiment and a second experiment described below.
以下、第１実験について説明する。
実験用の試料としては、平均直径、高さ、コア材質及び巻線の巻数が異なる三種類のトロイダルコイルＴＡ、ＴＢ、ＴＣを作製した（表１）。
As samples for experiments, three types of toroidal coils TA, TB, and TC having different average diameters, heights, core materials, and winding numbers were prepared (Table 1).
表２は、第１実験の測定結果である。
以下、第２実験について説明する。
実験用の試料としては、上記のトロイダルコイルＴＣを用いた。第２実験では、まず信号発生器２０から一次巻線５２に周波数１００ＫＨｚの正弦波の励磁電流０．５Ａを流した状態で、本発明に係る試料台１０（図１）の試料テーブル１２の上にトロイダルコイルＴＣを載置し、コアロス測定装置１００でコアロスを測定した。つづいて本発明に係る試料台１０において試料テーブル１２から２０ｍｍだけ上方へトロイダルコイルＴＣを浮かせた状態でコアロスを測定した。また同じ条件で、従来技術の試料台１０Ｐ（図１１）の試料テーブル１２の上にトロイダルコイルＴＣを載置し、コアロス測定装置１００でコアロスを測定した。つづいて従来技術の試料台１０Ｐにおいて試料テーブル１２から２０ｍｍだけ上方へトロイダルコイルＴＣを浮かせた状態でコアロスを測定した。
Hereinafter, the second experiment will be described.
The toroidal coil TC described above was used as an experimental sample. In the second experiment, first, on the sample table 12 of the sample stage 10 (FIG. 1) according to the present invention, a sine wave excitation current of 0.5 A having a frequency of 100 KHz is passed through the primary winding 52 from the signal generator 20. The toroidal coil TC was placed on the core, and the core loss was measured with the core loss measuring apparatus 100. Subsequently, the core loss was measured in a state where the toroidal coil TC was floated upward by 20 mm from the sample table 12 in the sample table 10 according to the present invention. Under the same conditions, the toroidal coil TC was placed on the sample table 12 of the conventional sample stage 10P (FIG. 11), and the core loss was measured by the core loss measuring apparatus 100. Subsequently, the core loss was measured in a state where the toroidal coil TC was floated upward by 20 mm from the sample table 12 on the sample table 10P of the prior art.
表３は、第２実験の測定結果である。
本発明に係る試料台１０の筐体１１の凹部１７は、試料となるトロイダルコイル５０の直径より２０ｍｍ以上長い直径の円を包含する大きさで、かつ試料テーブル１２の上面から底面までの長さが１５ｍｍ以上となる深さで形成されているのが好ましい。例えば当該実施例において、トロイダルコイル５０の平均直径は３９ｍｍであり、筐体１１の凹部１７は、直径Ｄが５９ｍｍ、深さＨが１５ｍｍに設定されている。このような特徴によれば、非磁性金属の筐体１１で発生する寄生渦電流損をさらに低減することができるので、試料テーブル１２に対するトロイダルコイル５０の配置に左右されることなくトロイダルコイル５０のコアロスをより高精度に測定することができる。これは以下説明する出願人が行った第３実験及び第４実験の結果に基づくものである。 The concave portion 17 of the housing 11 of the sample stage 10 according to the present invention has a size including a circle having a diameter that is 20 mm or more longer than the diameter of the toroidal coil 50 serving as a sample, and the length from the top surface to the bottom surface of the sample table 12. Is preferably formed to a depth of 15 mm or more. For example, in this embodiment, the average diameter of the toroidal coil 50 is 39 mm, and the recess 17 of the housing 11 is set to have a diameter D of 59 mm and a depth H of 15 mm. According to such a feature, the parasitic eddy current loss generated in the nonmagnetic metal casing 11 can be further reduced, so that the toroidal coil 50 is not affected by the arrangement of the toroidal coil 50 with respect to the sample table 12. Core loss can be measured with higher accuracy. This is based on the results of the third and fourth experiments conducted by the applicant described below.
以下、第３実験について図６及び図７を参照しながら説明する。
図６は、第３実験に用いたコアロス測定装置の試料台１０Ａの外観斜視図である。
出願人は、従来技術の試料台１０Ｐの試料テーブル１２を非磁性金属からなる第３実験用の試料テーブル１２Ａに置き換えた第３実験用の試料台１０Ａを用いて第３実験を行った（図６）。試料としては、前記の実験用のトロイダルコイルＴＡ、ＴＢ、ＴＣを用いた。具体的には、試料テーブル１２Ａの上にトロイダルコイルを載置し、信号発生器２０から一次巻線５２に周波数１００ＫＨｚの正弦波の励磁電流０．５Ａを流した状態で、試料テーブル１２Ａの上面（導体面）からトロイダルコイルの平均高さまでの距離ｈを変えながらコアロス測定装置１００でコアロスを順次測定していった。
Hereinafter, the third experiment will be described with reference to FIGS. 6 and 7.
FIG. 6 is an external perspective view of the sample stage 10A of the core loss measuring apparatus used in the third experiment.
The applicant conducted a third experiment using a sample table 10A for the third experiment in which the sample table 12 of the sample table 10P of the prior art was replaced with a sample table 12A for the third experiment made of nonmagnetic metal (FIG. 6). As the sample, the above-described experimental toroidal coils TA, TB, and TC were used. Specifically, a toroidal coil is placed on the sample table 12A, and a top surface of the sample table 12A is passed with a sine wave excitation current 0.5A having a frequency of 100 KHz flowing from the signal generator 20 to the primary winding 52. The core loss was sequentially measured by the core loss measuring device 100 while changing the distance h from the (conductor surface) to the average height of the toroidal coil.
図７は、第３実験の測定結果のグラフであり、縦軸が相対コアロス、横軸が距離ｈである。ここで相対コアロスは、上記の距離ｈが最も短いときのコアロスを１として相対換算したものであり、以下、同様とする。
第３実験の測定結果のグラフからは、トロイダルコイルＴＡ、ＴＢ、ＴＣ、いずれにおいても距離ｈが１５ｍｍ以上で相対コアロスＰｃが０．１以下になることを容易に読み取ることできる。そして第３実験における距離ｈは、本発明に係る試料台１０における筐体１１の凹部１７の深さＨに相当する。よって第３実験の測定結果からは、本発明に係る試料台１０において筐体１１の凹部１７の深さＨを１５ｍｍ以上に設定することによって、非磁性金属の筐体１１で発生する寄生渦電流損を効果的に低減できることが理解できる。
FIG. 7 is a graph of measurement results of the third experiment, in which the vertical axis represents relative core loss and the horizontal axis represents distance h. Here, the relative core loss is a relative conversion assuming that the core loss when the distance h is the shortest is 1, and the same applies hereinafter.
From the graph of the measurement results of the third experiment, it can be easily read that the distance h is 15 mm or more and the relative core loss Pc is 0.1 or less in any of the toroidal coils TA, TB, and TC. The distance h in the third experiment corresponds to the depth H of the concave portion 17 of the housing 11 in the sample stage 10 according to the present invention. Therefore, from the measurement result of the third experiment, the parasitic eddy current generated in the nonmagnetic metal casing 11 is set by setting the depth H of the concave portion 17 of the casing 11 to 15 mm or more in the sample stage 10 according to the present invention. It can be understood that the loss can be effectively reduced.
以下、第４実験について図８及び図９を参照しながら説明する。
図８は、第４実験に用いたコアロス測定装置の試料台１０Ｂの外観斜視図である。
さらに出願人は、上記の第３実験用の試料テーブル１２Ａ（非磁性金属）の中央にさらに円形開口部１８を形成した第４実験用の試料テーブル１２Ｂを作製した。また従来技術の試料台１０Ｐの筐体１１の上面には、充分な大きさで深さが約４０ｍｍの凹部を形成した（図示省略）。そして上記の実験用の三種類のトロイダルコイルＴＡ、ＴＢ、ＴＣを用いて、上記の筐体１１と試料テーブル１２Ｂで第４実験用の試料台１０Ｂを構成して第４実験を行った（図８）。具体的には、第４実験用の試料テーブル１２Ｂの上に、図示の如くトロイダルコイルの中心に円形開口部１８が位置するようにトロイダルコイルを載置する。そして信号発生器２０から一次巻線５２に周波数１００ＫＨｚの正弦波の励磁電流０．５Ａを流した状態で、第４実験用の試料テーブル１２Ｂの円形開口部１８の直径を変更しながらコアロス測定装置１００でコアロスを順次測定していった。
Hereinafter, the fourth experiment will be described with reference to FIGS.
FIG. 8 is an external perspective view of the sample stage 10B of the core loss measuring apparatus used in the fourth experiment.
Further, the applicant produced a sample table 12B for the fourth experiment in which a circular opening 18 was further formed in the center of the sample table 12A (nonmagnetic metal) for the third experiment. Further, a recess having a sufficient size and a depth of about 40 mm was formed on the upper surface of the casing 11 of the sample stage 10P of the prior art (not shown). Then, using the three types of toroidal coils TA, TB, and TC for the experiment described above, the fourth experiment was performed by configuring the sample stage 10B for the fourth experiment with the casing 11 and the sample table 12B (see FIG. 8). Specifically, the toroidal coil is placed on the sample table 12B for the fourth experiment so that the circular opening 18 is positioned at the center of the toroidal coil as shown in the figure. Then, the core loss measuring device is changed while changing the diameter of the circular opening 18 of the sample table 12B for the fourth experiment in a state where the excitation current 0.5A of a sine wave having a frequency of 100 KHz is supplied from the signal generator 20 to the primary winding 52. At 100, the core loss was measured sequentially.
図９は、第４実験の測定結果のグラフであり、縦軸が相対コアロス、横軸が直径差ΔＤである。ここで直径差ΔＤは、円形開口部１８の直径からトロイダルコイルの平均直径を減算した値であり、以下、同様とする。
第４実験の測定結果のグラフからは、トロイダルコイルＴＡ、ＴＢ、ＴＣ、いずれにおいても直径差ΔＤ２０ｍｍ以上で相対コアロスＰｃが０．１以下になることを容易に読み取ることできる。そして第４実験における直径差ΔＤは、本発明に係る試料台１０（図１）における筐体１１の凹部１７の直径Ｄとトロイダルコイル５０の平均直径との差に相当する。よって第４実験の測定結果からは、本発明に係る試料台１０において筐体１１の凹部１７をトロイダルコイル５０の平均直径より２０ｍｍ以上長い直径の円を包含する大きさとすることによって、非磁性金属の筐体１１で発生する寄生渦電流損を効果的に低減できることが理解できる。
FIG. 9 is a graph of the measurement results of the fourth experiment, where the vertical axis represents the relative core loss and the horizontal axis represents the diameter difference ΔD. Here, the diameter difference ΔD is a value obtained by subtracting the average diameter of the toroidal coil from the diameter of the circular opening 18, and the same applies hereinafter.
From the graph of the measurement results of the fourth experiment, it can be easily read that the relative core loss Pc is 0.1 or less with a diameter difference ΔD of 20 mm or more in any of the toroidal coils TA, TB, and TC. The diameter difference ΔD in the fourth experiment corresponds to the difference between the diameter D of the concave portion 17 of the housing 11 and the average diameter of the toroidal coil 50 in the sample stage 10 (FIG. 1) according to the present invention. Therefore, from the measurement result of the fourth experiment, in the sample stage 10 according to the present invention, the concave portion 17 of the housing 11 has a size including a circle having a diameter 20 mm or more longer than the average diameter of the toroidal coil 50, so that the nonmagnetic metal It can be understood that the parasitic eddy current loss generated in the casing 11 can be effectively reduced.
＜他の実施例、変形例＞
本発明は、上記説明した実施例に特に限定されるものではなく、特許請求の範囲に記載された発明の範囲内で種々の変形が可能であること言うまでもない。
<Other embodiments and modifications>
The present invention is not particularly limited to the embodiments described above, and it goes without saying that various modifications are possible within the scope of the invention described in the claims.
図１０は、本発明に係るコアロス測定装置の試料台１０の変形例を図示した外観斜視図である。
この変形例の試料台１０は、凹部１７が略矩形の開口形状を有している以外は、前述した実施例（図１）と同じ構成である。すなわち本発明に係る試料台１０の凹部１７は、特に前述した実施のように円形の開口形状を有するものに限定されないのであり、どのような形状であってもよい。
FIG. 10 is an external perspective view illustrating a modified example of the sample stage 10 of the core loss measuring apparatus according to the present invention.
The sample stage 10 of this modification has the same configuration as that of the above-described embodiment (FIG. 1) except that the concave portion 17 has a substantially rectangular opening shape. That is, the concave portion 17 of the sample stage 10 according to the present invention is not particularly limited to one having a circular opening shape as described above, and may have any shape.
また本発明に係る試料台１０は、コアロスの測定において寄生渦電流損を無視できる程に低減できればよいので、例えば筐体１１を非磁性金属ではなく樹脂等の絶縁性を有する材料で形成することによっても目的を達成することができる。この場合は、筐体１１の上面に凹部１７を設けなくてよい。 Further, the sample stage 10 according to the present invention only needs to be able to reduce the parasitic eddy current loss so that it can be ignored in the measurement of the core loss. For example, the housing 11 is formed of an insulating material such as a resin instead of a nonmagnetic metal. The purpose can also be achieved. In this case, the concave portion 17 may not be provided on the upper surface of the housing 11.
１０ 試料台
１１ 筐体
１２ 試料テーブル
１３〜１６ 端子
１７ 凹部
２０ 信号発生器
３０ 第１電圧測定回路
３１ シャント抵抗
４０ 第２電圧測定回路
５０ トロイダルコイル
１００ コアロス測定装置
DESCRIPTION OF SYMBOLS 10 Sample stand 11 Case 12 Sample table 13-16 Terminal 17 Recess 20 Signal generator 30 1st voltage measurement circuit 31 Shunt resistance 40 2nd voltage measurement circuit 50 Toroidal coil 100 Core loss measurement apparatus
Claims (3)
絶縁性を有する材料で形成され、前記筐体の上面に配置される試料テーブルと、を備え、
前記筐体の上面には、前記試料テーブル上に試料が配置される領域に対応する部分に凹部が形成され、
前記筐体の凹部は、試料となるトロイダルコイルの直径より２０ｍｍ以上長い直径の円を包含する大きさで、かつ前記試料テーブルの上面から前記凹部の底面までの長さが１５ｍｍ以上となる深さで形成されている、ことを特徴とするコアロス測定装置の試料台。 A housing made of non-magnetic metal;
A sample table formed of an insulating material and disposed on the upper surface of the housing,
On the upper surface of the housing, a recess is formed in a portion corresponding to a region where the sample is arranged on the sample table ,
The recess of the housing has a size including a circle having a diameter 20 mm or more longer than the diameter of the toroidal coil as a sample, and a depth from the top surface of the sample table to the bottom surface of the recess is 15 mm or more. A sample stage of a core loss measuring device, characterized in that it is formed by:
試料となるトロイダルコイルの一次巻線にシャント抵抗を介して正弦波の励磁電流を流す信号発生器と、
前記シャント抵抗の両端の電位差を測定する第１電圧測定回路と、
試料となるトロイダルコイルの二次巻線に生ずる誘起電圧を測定する第２電圧測定回路と、を備えるコアロス測定装置。 A sample stage of the core loss measuring device according to claim 1 or 2 ,
A signal generator for supplying a sinusoidal excitation current to the primary winding of the toroidal coil as a sample via a shunt resistor;
A first voltage measuring circuit for measuring a potential difference between both ends of the shunt resistor;
A core loss measuring device comprising: a second voltage measuring circuit that measures an induced voltage generated in a secondary winding of a toroidal coil that is a sample.
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