JP2996351B2 - Demagnetization coefficient measurement method for magnetic materials - Google Patents
Demagnetization coefficient measurement method for magnetic materialsInfo
- Publication number
- JP2996351B2 JP2996351B2 JP2241828A JP24182890A JP2996351B2 JP 2996351 B2 JP2996351 B2 JP 2996351B2 JP 2241828 A JP2241828 A JP 2241828A JP 24182890 A JP24182890 A JP 24182890A JP 2996351 B2 JP2996351 B2 JP 2996351B2
- Authority
- JP
- Japan
- Prior art keywords
- magnetic material
- demagnetization coefficient
- demagnetization
- measuring
- measured
- 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 - Fee Related
Links
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- Measuring Magnetic Variables (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は磁性材料の減磁係数測定方法の改良に関する
ものである。Description: TECHNICAL FIELD The present invention relates to an improvement in a method for measuring a demagnetization coefficient of a magnetic material.
［従来の技術］ 磁性材料を一様磁界（磁界H0）中において磁化する
と、磁界方向に対し磁性材料の両端に現われる反磁極が
磁性材料の内部に作用し、磁性材料の内部磁界Hiが、上
記の外部磁界H0よりも小さくなる。この場合、Hi/H0を
減磁率と定義している。When the prior art] magnetic material magnetized in a uniform magnetic field (magnetic field H 0), anti-poles with respect to the magnetic field direction appears across the magnetic material is applied to the inside of the magnetic material, the internal magnetic field H i of the magnetic material It is smaller than the external magnetic field H 0 above. In this case, it is defined as a reduced permeability of the H i / H 0.
従来、磁性材料の減磁率を測定する場合、磁性材料を
所定の形状に標準化し、この標準化試料について減磁率
を測定している。Conventionally, when measuring the demagnetization rate of a magnetic material, the magnetic material is standardized into a predetermined shape, and the demagnetization rate of this standardized sample is measured.
［発明が解決しようとする課題］ ところで、電力ケーブル線路においては、アングル材
等、断面形状の複雑な鉄・鋼材を使用しており、電力ケ
ーブルから誘起される磁界のためにこれらの鉄・鋼材に
鉄損が発生し、その鉄損の評価には正確な減磁率の把握
が必要である。[Problems to be Solved by the Invention] By the way, in power cable lines, iron and steel materials having complicated cross-sectional shapes such as angle materials are used. Due to the magnetic field induced from the power cable, these iron and steel materials are used. Iron loss occurs, and it is necessary to accurately grasp the demagnetization rate to evaluate the iron loss.
而して、上記アングル材のような複雑な断面形状を有
する磁性材料においては、その形状が減磁率に複雑な関
係で関与してくるから、減磁率の測定には、実際の断面
形状の試料を使用することが有利であり、この場合、試
料の長さが２〜3mもの長尺体となる。Thus, in a magnetic material having a complicated cross-sectional shape such as the above-described angle material, the shape is involved in a complicated relationship with the demagnetization rate. Is advantageous, and in this case, the length of the sample is as long as 2 to 3 m.
従って、従来のような標準化試料についての減磁率の
測定方法では正確な減磁率を把握し難い。Therefore, it is difficult to accurately determine the demagnetization rate by the conventional method of measuring the demagnetization rate of the standardized sample.
本発明の目的は、断面形状が複雑で、かつ長尺の磁性
材料試料であっても減磁率（この減磁率は断面形状をも
含めて評価するものであるため、以下、減磁係数とい
う）を容易かつ正確に測定できる方法を提供することに
ある。An object of the present invention is to provide a demagnetization rate even for a magnetic material sample having a complicated cross-sectional shape and a long length. Is to provide a method that can easily and accurately measure.
［課題を解決するための手段］ 本発明に係る磁性材料の減磁係数測定方法は、電力ケ
ーブル線路に使用するアングル，ロッド，パイプ状の鉄
・鋼材からなる磁性材料部材の鉄損を評価するための減
磁係数測定方法であって、被測定物となる前記磁性材料
部材の、その長手方向の一端から中心までの等間隔とし
た数箇所に、それぞれサーチコイルを巻付け、このサー
チコイル巻付け被測定物を、非磁性材料製のパイプ上に
絶縁電線を螺旋状に巻付けてなる一様磁界を発生させる
構成とした円筒ソレノイドの筒内に挿入し、前記サーチ
コイルのそれぞれに誘起される誘起電圧の平均値から減
磁係数を測定することを特徴とする磁性材料の減磁係数
測定方法。[Means for Solving the Problems] The method for measuring the demagnetization coefficient of a magnetic material according to the present invention evaluates the iron loss of a magnetic material member made of an iron / steel material in the form of an angle, a rod, or a pipe used for a power cable line. In the method for measuring the demagnetization coefficient, a search coil is wound around several places at equal intervals from one end in the longitudinal direction to the center of the magnetic material member to be measured. The object to be measured is inserted into a cylinder of a cylindrical solenoid configured to generate a uniform magnetic field formed by spirally winding an insulated wire on a pipe made of a non-magnetic material, and induced in each of the search coils. A method of measuring a demagnetization coefficient of a magnetic material from an average value of induced voltages.
［作用］ 上記したように本発明方法においては、サーチコイル
が被測定物の長手方向数箇所に亙り設けてあり、これら
のサーチコイルから当該箇所の誘起電圧ならびにそれら
の平均値が測定できる。而して、斯かる誘起電圧平均値
を基に所定の算定式に当て嵌めれば被測定物の減磁係数
が容易に求められる。[Operation] As described above, in the method of the present invention, the search coils are provided at several locations in the longitudinal direction of the device under test, and the induced voltages at those locations and their average values can be measured from these search coils. Thus, the demagnetization coefficient of the measured object can be easily obtained by applying a predetermined calculation formula based on the induced voltage average value.
従って、被測定物の寸法が大きくて各所における内部
磁界に差があっても、被測定物全体の減磁係数を簡易か
つ迅速に測定することができる。Therefore, even if the size of the device under test is large and there is a difference in the internal magnetic field at each location, the demagnetization coefficient of the entire device under test can be measured easily and quickly.
［実施例］ 以下、図面により本発明を説明する。図において、１
は一様磁界を発生させるための円筒ソレノイドであり、
非磁性材料のパイプ11（例えばPVCパイプ）上に絶縁電
線12を螺旋状に巻き付けてある。２は電源、３は変成
器、４は電流計である。５は減磁係数を測定すべき被測
定物例えば鉄鋼アングル材，ロッド，パイプ等であり、
その長さは数10cm〜数ｍである。Hereinafter, the present invention will be described with reference to the drawings. In the figure, 1
Is a cylindrical solenoid for generating a uniform magnetic field,
An insulated wire 12 is spirally wound around a pipe 11 made of a non-magnetic material (for example, a PVC pipe). 2 is a power supply, 3 is a transformer, and 4 is an ammeter. Reference numeral 5 denotes an object to be measured whose demagnetization coefficient is to be measured, for example, a steel angle material, a rod, a pipe, or the like.
Its length is several tens cm to several meters.
61,62・・・は被測定物の数箇所に巻付けたサーチコ
イルでありその巻付け箇所は被測定物の長手方向の対称
性を考慮して一端部から中心までの等間隔の数箇所とす
ることが望ましい。61, 62 ... are search coils wound around several points on the object to be measured, and the winding points are several places at equal intervals from one end to the center in consideration of the symmetry in the longitudinal direction of the object to be measured. It is desirable.
７は各サーチコイル61,62・・・に対する電圧計であ
り、切換スイッチ71を備えている。Reference numeral 7 denotes a voltmeter for each of the search coils 61, 62,.
本発明によって、被測定物５の減磁係数を測定するに
は、円筒ソレノイド１を通電して、円筒ソレノイド内に
一様磁界H0を発生させる。The present invention, to measure the磁係number reduction of the object to be measured 5 is energized cylindrical solenoid 1, to generate a uniform magnetic field H 0 in the cylindrical solenoid.
いま、ソレノイド巻数をＮ、ソレノイド長さを、ソ
レノイド半径をａ、通電電流をＩとすれば、 である。Now, assuming that the number of solenoid turns is N, the solenoid length is a, the solenoid radius is a, and the energizing current is I, It is.
このようにして、ソレノイド１内に一様な磁界H0を発
生させれば、被測定物５をソレノイド１内に挿入し、各
サーチコイル61,62・・・における誘起電圧を測定し、
その平均値を求める。When a uniform magnetic field H 0 is generated in the solenoid 1 in this manner, the device under test 5 is inserted into the solenoid 1 and the induced voltages in the respective search coils 61, 62.
Find the average value.
この誘起電圧と被測定物の内部磁界Hiとの間には、
周波数をｆ、サーチコイル巻数をｎ、真空の透磁率をμ
０、被測定物材料の比透磁率をμｓ、被測定物の磁界通
過断面積（Skin depth理論により算定）をＳとすれ
ば、 の関係がある。Between the internal magnetic field H i of the induced voltage and the measured object,
The frequency is f, the number of turns of the search coil is n, and the magnetic permeability of vacuum is μ.
0 , the relative magnetic permeability of the DUT material is μ s , and the magnetic field cross-sectional area of the DUT (calculated by Skin depth theory) is S, There is a relationship.
従って、第１式、第２式からH0、Hiを求めHi/H0より
被測定物の減磁係数を測定できる。Accordingly, H 0 and H i are obtained from the first and second equations, and the demagnetization coefficient of the device under test can be measured from H i / H 0 .
［発明の効果］ 本発明に係る磁性材料の減磁係数測定方法において
は、上述した通り、被測定物の数箇所における内部磁界
の平均値を測定し得るように被測定物の数箇所にサーチ
コイルを巻付けているから、被測定物の寸法が大きくて
各所における内部磁界に差があっても、被測定物全体の
減磁係数を簡易かつ迅速に把握できる。[Effects of the Invention] In the method for measuring the demagnetization coefficient of a magnetic material according to the present invention, as described above, a search coil is wound around several points on an object to be measured so that the average value of the internal magnetic field at several points on the object can be measured. Therefore, even if the size of the device under test is large and there is a difference in the internal magnetic field at each location, the demagnetization coefficient of the entire device under test can be easily and quickly grasped.
図面は本発明において使用する減磁係数測定装置の概要
を示す斜視図である。 図において、１は円筒形ソレノイド、２は電源、３は変
成器、４は電流計、５は被測定物、61,62・・・はサー
チコイル、７は電圧計、71は切換スイッチである。The drawing is a perspective view showing an outline of a demagnetization coefficient measuring device used in the present invention. In the figure, 1 is a cylindrical solenoid, 2 is a power supply, 3 is a transformer, 4 is an ammeter, 5 is an object to be measured, 61, 62 ... are search coils, 7 is a voltmeter, and 71 is a changeover switch. .
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭64−3556（ＪＰ，Ａ) 特開 昭47−37677（ＪＰ，Ａ) 実開 昭47−36373（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) G01R 33/12 - 33/18 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-64-3556 (JP, A) JP-A-47-37677 (JP, A) Jpn. Field (Int.Cl. 6 , DB name) G01R 33/12-33/18
Claims (1)
ッド，パイプ状の鉄・鋼材からなる磁性材料部材の鉄損
を評価するための減磁係数測定方法であって、被測定物
となる前記磁性材料部材の、その長手方向の一端から中
心までの等間隔とした数箇所に、それぞれサーチコイル
を巻付け、このサーチコイル巻付け被測定物を、非磁性
材料製のパイプ上に絶縁電線を螺旋状に巻付けてなる一
様磁界を発生させる構成とした円筒ソレノイドの筒内に
挿入し、前記サーチコイルのそれぞれに誘起される誘起
電圧の平均値から減磁係数を測定することを特徴とする
磁性材料の減磁係数測定方法。A demagnetization coefficient measuring method for evaluating iron loss of a magnetic material member made of an angle, a rod, or a pipe, which is used for an electric power cable line, wherein the magnetic material serving as an object to be measured is provided. A search coil is wound around each of several places of the material member at equal intervals from one end in the longitudinal direction to the center, and the object to be wound with the search coil is spirally wound on an insulated wire on a non-magnetic material pipe. And inserted into a cylinder of a cylindrical solenoid configured to generate a uniform magnetic field wound in a shape, and measuring a demagnetization coefficient from an average value of an induced voltage induced in each of the search coils. A method for measuring the demagnetization coefficient of a magnetic material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2241828A JP2996351B2 (en) | 1990-09-12 | 1990-09-12 | Demagnetization coefficient measurement method for magnetic materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2241828A JP2996351B2 (en) | 1990-09-12 | 1990-09-12 | Demagnetization coefficient measurement method for magnetic materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04120485A JPH04120485A (en) | 1992-04-21 |
| JP2996351B2 true JP2996351B2 (en) | 1999-12-27 |
Family
ID=17080101
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2241828A Expired - Fee Related JP2996351B2 (en) | 1990-09-12 | 1990-09-12 | Demagnetization coefficient measurement method for magnetic materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2996351B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107918107B (en) * | 2017-12-14 | 2023-09-08 | 安徽大学 | Demagnetization detection device and detection method of permanent magnet synchronous linear motor |
-
1990
- 1990-09-12 JP JP2241828A patent/JP2996351B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04120485A (en) | 1992-04-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |