JPH06337260A - Internal diagnostic method for conductor - Google Patents
Internal diagnostic method for conductorInfo
- Publication number
- JPH06337260A JPH06337260A JP5148288A JP14828893A JPH06337260A JP H06337260 A JPH06337260 A JP H06337260A JP 5148288 A JP5148288 A JP 5148288A JP 14828893 A JP14828893 A JP 14828893A JP H06337260 A JPH06337260 A JP H06337260A
- Authority
- JP
- Japan
- Prior art keywords
- conductor
- liquid phase
- coil
- current
- steel material
- 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.)
- Withdrawn
Links
Landscapes
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、金属パイプ、鋼材等の
導電体の組成等を電気的に評価するための導電体の内部
診断方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for internally diagnosing an electric conductor for electrically evaluating the composition of the electric conductor such as a metal pipe and a steel material.
【０００２】[0002]
【従来の技術】例えば、鋼材等の鋳造工程での高温状態
（例えば１５００℃）においては、製品の品質を向上さ
せるため、内部状態（外側は固相、内側は液相）に依存
して圧延ロールの位置や負荷を適切に設定する必要があ
る（なお、固相とは溶鉱から鋼材を加工した際の表層部
が固化した状態を示し、液相は中心部が溶鉱のままの液
化している状態を言っている）。2. Description of the Related Art For example, in a high temperature state (for example, 1500 ° C.) in a casting process of steel or the like, rolling is performed depending on an internal state (a solid phase on the outside and a liquid phase on the inside) in order to improve product quality. It is necessary to set the position and load of the rolls appropriately (the solid phase indicates the state where the surface layer is solidified when processing the steel from the molten ore, and the liquid phase is the liquefaction with the molten ore in the center) I'm saying that I'm doing).
【０００３】従来、上記の設定手段としては、本発明者
らの場合、表面温度を接触状態または近似的に非接触で
計測し、この結果に基づいて何らかの推定（または仮
定）をし、或いは目的とする温度を融点にもつ物質（具
体的には金属）を内部に打ち込んで溶けた時点でその温
度とし、その位置から内部を推定（または仮定）してい
た。Conventionally, as the setting means, in the case of the present inventors, the surface temperature is measured in a contact state or approximately non-contact, and some estimation (or assumption) is made based on this result, or the purpose is A substance (specifically, a metal) having a melting point at a temperature of is used as the temperature at the time when the substance is melted and melted, and the inside is estimated (or assumed) from the position.
【０００４】[0004]
【発明が解決しようとする課題】しかし、上記した従来
技術にあっては、固相と液相の変化点を知りたい場合、
製品の表面状態（温度）の情報のみに基づいて内部の仮
定、及び異種材の打ち込みによる表面近傍温度からの内
部仮定を行なっている。このため、接触作用を伴う作業
を必要とするとともに、表面状態と内部状態の相関が定
かでない状態における内部仮定を不正確な状態で行なわ
ねばならないという問題がある。However, in the above-mentioned prior art, when it is desired to know the change point between the solid phase and the liquid phase,
The internal assumption is made based only on the surface condition (temperature) of the product, and the internal assumption is made from the temperature near the surface due to the implantation of different materials. For this reason, there is a problem that a work involving contact action is required and an internal assumption must be made in an inaccurate state when the correlation between the surface state and the internal state is not clear.
【０００５】本発明の目的は、導電体の内部状態の評価
を外部から非接触で評価できるようにする導電体の内部
診断方法を提供することにある。It is an object of the present invention to provide a method for diagnosing the internal state of a conductor, which enables evaluation of the internal state of the conductor from the outside in a non-contact manner.
【０００６】[0006]
【課題を解決するための手段】上記の目的を達成するた
めに、この発明は、固相部分と液相部分が生じている導
電体の周囲に配設したコイルによって前記導電体に移動
磁界を付与し、この移動磁界に応じて前記導電体内に生
じる誘導電流に基づいて前記液相部分に対する回転力を
生じさせ、その際の前記コイルに流れる電流に基づいて
前記導電体の内部状態を判定するようにしている。In order to achieve the above object, the present invention provides a moving magnetic field to a conductor by a coil arranged around the conductor in which a solid phase portion and a liquid phase portion are formed. A rotating force is applied to the liquid phase portion based on the induced current generated in the conductor according to the moving magnetic field, and the internal state of the conductor is determined based on the current flowing in the coil at that time. I am trying.
【０００７】[0007]
【作用】上記した手段によれば、連続鋳造過程の鋼材の
ように部分的に固相（固相部分）と液相（液相部分）を
有する導電体に対し、外部から３相交流などの変動磁場
を与えると、導電体の内部にはその円周方向に液相部分
を回転させようとするトルクが発生する。これは誘導電
動機の原理そのものであり、各相に流れる負荷電流を計
測することによって、その値から固相部分と液相部分の
割合（内部構成）を判定することができる。すなわち、
従来判定困難であった固、液２相構成の内部状態を非接
触で判定することが可能になる。According to the above-mentioned means, a conductor having a solid phase (solid phase portion) and a liquid phase (liquid phase portion), such as a steel material in a continuous casting process, is externally exposed to a three-phase alternating current or the like. When a fluctuating magnetic field is applied, a torque is generated inside the conductor to rotate the liquid phase portion in the circumferential direction. This is the principle of the induction motor itself, and by measuring the load current flowing in each phase, the ratio (internal configuration) of the solid phase portion and the liquid phase portion can be determined from the value. That is,
It is possible to make a non-contact determination of the internal state of a solid-liquid two-phase configuration, which was difficult to determine in the past.
【０００８】[0008]
【実施例】以下、本発明の実施例について図面を参照し
ながら説明する。なお、以下においては、円柱状の鋼材
に対する表面部（固相）と内部（液相）の評価を例に説
明する。Embodiments of the present invention will be described below with reference to the drawings. In the following, the evaluation of the surface portion (solid phase) and the inside (liquid phase) of a cylindrical steel material will be described as an example.
【０００９】図１は本発明による導電体の内部診断方法
の実施例を示す平面図であり、図２は図１に示すコイル
配置をした鋼材の全体図である。FIG. 1 is a plan view showing an embodiment of a method for diagnosing the inside of a conductor according to the present invention, and FIG. 2 is an overall view of a steel material having the coil arrangement shown in FIG.
【００１０】まず、本発明の原理について説明する。図
３に示すように、連続鋳造過程にあるような鋼材１（円
形断面を有する長い鋼材）は、図４（図３のＩＩ−ＩＩ
断面図）に示すように固相部分２と液相部分３を有して
いる。First, the principle of the present invention will be described. As shown in FIG. 3, the steel material 1 (long steel material having a circular cross section) as in the continuous casting process is shown in FIG. 4 (II-II in FIG. 3).
As shown in the sectional view), it has a solid phase portion 2 and a liquid phase portion 3.
【００１１】鋼材１に対し、図５に示すように鋼材１の
外周部に近接させてコイル４を配設し、これに電流ＪD
を流した場合、図６（図５のＩＩＩ−ＩＩＩ断面図）に
示すように、電流ＪDの変化に応じ、軸方向磁場ＨD（ｒ
ｏｔＨD＝ＪD）９が生じる。この状態で図７に示すよう
にコイル４を円周方向に移動させると、鋼材１の軸方向
磁場ＨDは変動磁場となり、ファラデーの電磁誘導の法
則により誘導電流（渦電流）ｉeが発生する。磁場内に
電流が流れると、フレミングの左手の法則により、図８
（図７におけるＩＶ−ＩＶ断面図）に示すような力Ｆが
生じる。（Ｆ＝ｉｅ1×Ｂ、Ｂ＝μ0ＨD：ただしＢは磁
束密度であり、μ0は透磁率である）。As shown in FIG. 5, with respect to the steel material 1, a coil 4 is arranged close to the outer peripheral portion of the steel material 1, and a current J D is applied to the coil 4.
If shed, as shown in FIG. 6 (III-III sectional view of FIG. 5), depending on the change in current J D, axial magnetic field H D (r
otH D = J D ) 9 occurs. In this state, when the coil 4 is moved in the circumferential direction as shown in FIG. 7, the axial magnetic field H D of the steel material 1 becomes a fluctuating magnetic field, and an induced current (eddy current) i e is generated according to Faraday's law of electromagnetic induction. To do. When a current flows in the magnetic field, Fleming's left-hand rule causes
A force F as shown in (IV-IV sectional view in FIG. 7) is generated. (F = ie 1 × B, B = μ 0 H D: which B is a magnetic flux density, mu 0 is the permeability).
【００１２】力Ｆは、渦電流ｉeと磁場ＨDの大きさに比
例した分布になるため、それらの合力はコイル４の移動
方向と同じになる。この結果、図９に示すように、コイ
ル４に引かれて鋼材１の円周方向へ動くことになる。こ
の現象は、“アラゴの円板”として知られているもの
で、誘導電動機の動作原理でもある。この原理を用い
て、コイル４を動かすことなく、図１０のように鋼材１
の円周方向に複数のコイル（例えばコイル４，５，６の
３個）を配設し、これらに３相交流を印加することによ
り、移動磁界を得ることができる。コイルの極数は、３
個に限らず任意に決めることができる。Since the force F has a distribution proportional to the magnitudes of the eddy current i e and the magnetic field H D , the resultant force is the same as the moving direction of the coil 4. As a result, as shown in FIG. 9, the steel material 1 is pulled by the coil 4 and moves in the circumferential direction of the steel material 1. This phenomenon is known as the "Arago disk" and is also the principle of operation of the induction motor. Using this principle, as shown in FIG.
A moving magnetic field can be obtained by disposing a plurality of coils (for example, three coils 4, 5, and 6) in the circumferential direction and applying a three-phase alternating current to them. The number of poles of the coil is 3
It is not limited to individual pieces and can be determined arbitrarily.
【００１３】コイル４，５，６の結線は、図１１に示す
ように、交流電源７のｕ，ｖ，ｗの３相の出力をコイル
相互の接点につなぐようにすればよい。そして、ｕ，
ｖ，ｗの各ラインに電流計８ａ，８ｂ，８ｃの各々を接
続し、各相の負荷電流を測定する。The coils 4, 5 and 6 may be connected by connecting the outputs of the three phases u, v and w of the AC power supply 7 to the mutual contacts of the coils as shown in FIG. And u,
The ammeters 8a, 8b and 8c are connected to the v and w lines, and the load current of each phase is measured.
【００１４】次に、図１及び図２を参照して本発明方法
の適用例について説明する。Next, an application example of the method of the present invention will be described with reference to FIGS.
【００１５】図２に示すように、鋼材１の周囲にコイル
４，５，６を鋼材１の中心に対し１２０°間隔で配置
し、図１に示すように各コイル間に交流電源７の出力
ｕ，ｖ，ｗを接続する。これにより鋼材１の内部には図
９で説明したような力Ｆ（トルクＴ）が生じる。液相部
分３が示す割合に応じてコイル４〜６の各負荷が変動す
る。そこで、コイル負荷を電流計８ａ，８ｂ，８ｃで計
測する。鋼材１の軸方向に所定間隔づつ移動させなが
ら、その都度電流計８ａ，８ｂ，８ｃで計測することに
より、各計測位置における電流値を位置に対応させて特
性図を作成することにより、鋼材１の内部状態（固相部
分２と液相部分３の割合）を知ることができる。As shown in FIG. 2, coils 4, 5 and 6 are arranged around the steel material 1 at intervals of 120 ° with respect to the center of the steel material 1, and as shown in FIG. Connect u, v, w. As a result, the force F (torque T) described in FIG. 9 is generated inside the steel material 1. Each load of the coils 4 to 6 changes according to the ratio indicated by the liquid phase portion 3. Therefore, the coil load is measured by the ammeters 8a, 8b, 8c. While moving the steel material 1 in the axial direction by a predetermined interval, each time the ammeter 8a, 8b, 8c measures the current value at each measurement position to create a characteristic diagram corresponding to the position, The internal state (ratio of the solid phase portion 2 and the liquid phase portion 3) can be known.
【００１６】なお、上記実施例においては、変動磁場を
形成するために交流電源７に３相交流を用いたが、３相
交流に限定されるものではなく、６相などの３相以外の
多相交流を用いてもよい。In the above embodiment, the three-phase alternating current is used as the alternating-current power supply 7 to form the fluctuating magnetic field, but the present invention is not limited to the three-phase alternating current, and many other than three phases such as six phases. Phase alternating current may be used.
【００１７】[0017]
【発明の効果】以上説明した通り、この発明は、固相部
分と液相部分が生じている導電体の周囲に配設したコイ
ルによって前記導電体に移動磁界を付与し、この移動磁
界に応じて前記導電体内に生じる誘導電流に基づいて前
記液相部分に対する回転力を生じさせ、その際の前記コ
イルに流れる電流に基づいて前記導電体の内部状態を判
定するようにしたので、変動磁場を形成している負荷電
流を計測することによって、その値から固相部分と液相
部分の割合（内部構成）を判定することができる。すな
わち、従来判定困難であった固、液２相構成の内部状態
を非接触で判定することが可能になる。As described above, according to the present invention, a moving magnetic field is applied to a conductor by a coil arranged around the conductor in which a solid phase portion and a liquid phase portion are generated, and the moving magnetic field is generated according to the moving magnetic field. As a result, a rotational force for the liquid phase portion is generated based on the induced current generated in the conductor, and the internal state of the conductor is determined based on the current flowing in the coil at that time. By measuring the formed load current, the ratio (internal constitution) of the solid phase portion and the liquid phase portion can be determined from the value. That is, it becomes possible to make a non-contact determination of the internal state of a solid-liquid two-phase structure, which has been difficult to determine in the past.
【図１】本発明による導電体の内部診断方法の実施例を
示す平面図である。FIG. 1 is a plan view showing an embodiment of a method for diagnosing the inside of a conductor according to the present invention.
【図２】図１に示すコイル配置をした鋼材の全体図であ
る。FIG. 2 is an overall view of a steel material having the coil arrangement shown in FIG.
【図３】連続鋳造過程における鋼材の内部状態を示す説
明図である。FIG. 3 is an explanatory diagram showing an internal state of a steel material in a continuous casting process.
【図４】図３のＩＩ−ＩＩ断面における磁界の付与及び
渦電流発生を説明する説明図である。FIG. 4 is an explanatory diagram illustrating application of a magnetic field and generation of an eddy current in a II-II cross section of FIG.
【図５】鋼材に近接させてコイルを配置した様子を示す
説明図である。FIG. 5 is an explanatory view showing a state in which a coil is arranged close to a steel material.
【図６】図５におけるＩＩＩ−ＩＩＩ断面図である。6 is a sectional view taken along line III-III in FIG.
【図７】図５の状態からコイルを円周方向に移動させた
場合の鋼材内における渦電流の発生を示す説明図であ
る。FIG. 7 is an explanatory diagram showing the generation of eddy currents in the steel material when the coil is moved in the circumferential direction from the state of FIG.
【図８】図７のＩＶ−ＩＶ断面図である。8 is a sectional view taken along line IV-IV in FIG.
【図９】力Ｆがコイルの移動方向と同じになる様子を示
す説明図である。FIG. 9 is an explanatory diagram showing a state in which the force F becomes the same as the moving direction of the coil.
【図１０】鋼材の周辺に３つのコイルを配設した様子を
示す説明図である。FIG. 10 is an explanatory diagram showing a state in which three coils are arranged around a steel material.
【図１１】図１０の各コイルに３相交流を印加した様子
を示す説明図である。11 is an explanatory diagram showing a state in which a three-phase alternating current is applied to each coil in FIG.
１ 鋼材 ２ 固相部分 ３ 液相部分 ４，５，６ コイル ７ 交流電源 ８ａ，８ｂ，８ｃ 電流計 1 Steel Material 2 Solid Phase Part 3 Liquid Phase Part 4, 5, 6 Coil 7 AC Power Supply 8a, 8b, 8c Ammeter
Claims (1)
の周囲に配設したコイルによって前記導電体に移動磁界
を付与し、この移動磁界に応じて前記導電体内に生じる
誘導電流に基づいて前記液相部分に対する回転力を生じ
させ、その際の前記コイルに流れる電流に基づいて前記
導電体の内部状態を判定することを特徴とする導電体の
内部診断方法。1. A moving magnetic field is applied to the electric conductor by a coil disposed around the electric conductor in which a solid phase portion and a liquid phase portion are generated, and an induced current is generated in the electric conductor according to the moving magnetic field. A method for diagnosing the inside of a conductor is characterized in that a rotational force is generated on the liquid phase portion based on the current, and an internal state of the conductor is determined based on a current flowing through the coil at that time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5148288A JPH06337260A (en) | 1993-05-28 | 1993-05-28 | Internal diagnostic method for conductor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5148288A JPH06337260A (en) | 1993-05-28 | 1993-05-28 | Internal diagnostic method for conductor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06337260A true JPH06337260A (en) | 1994-12-06 |
Family
ID=15449424
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5148288A Withdrawn JPH06337260A (en) | 1993-05-28 | 1993-05-28 | Internal diagnostic method for conductor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06337260A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858463A (en) * | 2021-01-06 | 2021-05-28 | 西华大学 | Device for measuring solid-phase medium concentration in solid-liquid two-phase fluid |
-
1993
- 1993-05-28 JP JP5148288A patent/JPH06337260A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858463A (en) * | 2021-01-06 | 2021-05-28 | 西华大学 | Device for measuring solid-phase medium concentration in solid-liquid two-phase fluid |
| CN112858463B (en) * | 2021-01-06 | 2023-11-24 | 西华大学 | Device for measuring concentration of solid medium in solid-liquid two-phase fluid |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Guo et al. | Measurement and modeling of rotational core losses of soft magnetic materials used in electrical machines: A review | |
| US4528856A (en) | Eddy current stress-strain gauge | |
| Atallah et al. | Calculation of the rotational power loss in electrical steel laminations from measured H and B | |
| Meyer et al. | A comprehensive study of the induced current, the electromagnetic force field, and the velocity field in a complex electromagnetically driven flow system | |
| Enokizono et al. | Measurement of dynamic magnetostriction under rotating magnetic field | |
| Findlay et al. | Losses due to rotational flux in three phase induction motors | |
| Varghese et al. | Design and development of rotor quality test system for die-cast copper rotors | |
| US6815957B2 (en) | Method and device for inspecting laminated iron cores of electrical machines for interlamination shorts | |
| Mallard et al. | Increasing the energy efficiency of induction machines by the use of grain-oriented magnetic materials and die casting copper squirrel cage in the rotor | |
| Fukuoka et al. | Consideration of multi-coil type magnetizer for detection of omnidirectional crack in magnetic particle testing | |
| JPH06337260A (en) | Internal diagnostic method for conductor | |
| Moses et al. | Measurement of rotating flux in silicon iron laminations | |
| JPH06337259A (en) | Internal diagnostic method for conductor | |
| Karmaker | Open circuit tooth ripple losses in slotted laminated poles of electrical machines with amortisseur windings | |
| JP2008057990A (en) | Flow rate estimation method and flow rate control method for molten steel | |
| JPH06337258A (en) | Internal diagnostic method for conductor | |
| Reinlein et al. | Influence of Villari Effect on the magnetizing current of Induction Machines by shrink fitting of rotor cores | |
| JPS6125312B2 (en) | ||
| Mashiko et al. | Evaluation of joint interface of friction stir welding between dissimilar metals using HTS-SQUID gradiometer | |
| JP3243402B2 (en) | Conductor flaw detection device | |
| Takahashi et al. | Improvement of unbalanced current capability of large turbine generators | |
| Salz et al. | Power loss in electrical steel under elliptically rotating flux conditions | |
| JPH06337253A (en) | Internal diagnostic method for conductor | |
| Zurek | Rotational magnetisation | |
| JPH08105860A (en) | Flaw detector for conductor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20000801 |