JPH10183326A - Control method for induction heating device - Google Patents
Control method for induction heating deviceInfo
- Publication number
- JPH10183326A JPH10183326A JP34168096A JP34168096A JPH10183326A JP H10183326 A JPH10183326 A JP H10183326A JP 34168096 A JP34168096 A JP 34168096A JP 34168096 A JP34168096 A JP 34168096A JP H10183326 A JPH10183326 A JP H10183326A
- Authority
- JP
- Japan
- Prior art keywords
- induction heating
- heating device
- inverter
- heated
- temperature
- 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
Links
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- Coating With Molten Metal (AREA)
- Furnace Details (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、自励式のインバー
タを有し、被加熱体を移送しながら誘導加熱する複数の
加熱コイルからなる誘導加熱装置の制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an induction heating apparatus having a self-excited inverter and comprising a plurality of heating coils for performing induction heating while transferring a heated object.
【０００２】[0002]
【従来の技術】従来、被加熱体を移送しながら誘導加熱
する複数のコイルからなる誘導加熱装置において、この
誘導加熱装置の出側における被加熱体の温度を目標値と
なるように制御する方法としては、例えば特開昭59-598
24号公報、特開昭61−249621号公報、特開昭61−201302
号公報、特開平4-221027号公報、特開昭63-68282号公報
などに種々のものが提案されている。2. Description of the Related Art Conventionally, in an induction heating apparatus comprising a plurality of coils for performing induction heating while transferring an object to be heated, a method for controlling the temperature of the object to be heated on the outlet side of the induction heating apparatus to a target value. As, for example, JP-A-59-598
No. 24, JP-A-61-249621, JP-A-61-201302
Various proposals have been made in Japanese Patent Application Laid-Open No. Hei. 4-21027, Japanese Patent Application Laid-Open No. Sho 63-68282, and the like.
【０００３】これらのすべてに共通しているのは、誘導
加熱炉の出側で温度検出器により材料温度を実測するこ
とであり、この測定結果と目標温度との偏差に基づいて
誘導加熱炉の電圧、電流、あるいは電力などの設定値を
決定するやり方である。ところが、例えば鋼板の表面に
めっきをする工程において、溶融金属が付着した鋼板を
加熱し、それを合金化するために誘導加熱装置を使用す
る場合に、誘導加熱装置の出側ではまだ合金化が進行中
であることが多い。この段階では鋼板表面の放射率が急
激に変動するため、放射温度計等の温度検出器による鋼
板の温度測定が困難であり、したがって前記の各種の制
御方法を採用することができないという問題点がある。[0003] Common to all of these is that the material temperature is actually measured by a temperature detector at the outlet side of the induction heating furnace. Based on the deviation between the measurement result and the target temperature, the temperature of the induction heating furnace is measured. This is a method of determining a set value such as voltage, current, or power. However, for example, in the process of plating the surface of a steel sheet, when the steel sheet to which the molten metal adheres is heated and an induction heating device is used to alloy the steel sheet, alloying is still performed on the exit side of the induction heating device. Often ongoing. At this stage, since the emissivity of the steel sheet surface fluctuates rapidly, it is difficult to measure the temperature of the steel sheet by using a temperature detector such as a radiation thermometer, and therefore, the above-described various control methods cannot be adopted. is there.
【０００４】[0004]
【発明が解決しようとする課題】本発明は、誘導加熱装
置出側において温度検出器による材料温度の実測を行う
ことなく材料温度を目標値に制御することを可能とする
誘導加熱装置の制御方法を実現することを目的とする。SUMMARY OF THE INVENTION The present invention relates to a method for controlling an induction heating apparatus, which makes it possible to control a material temperature to a target value without actually measuring the material temperature by a temperature detector at the exit side of the induction heating apparatus. The purpose is to realize.
【０００５】[0005]
【課題を解決するための手段】本発明の誘導加熱装置の
制御方法は、自励式のインバータを有し、被加熱体を移
送しながら誘導加熱する複数の加熱コイルからなる誘導
加熱装置において、前記インバータの出力電流、出力端
子間電圧、各コイルでの発振周波数のそれぞれの測定値
と、被加熱体の材料寸法および材質から、この誘導加熱
装置の出側における被加熱体の温度を推定し、この推定
値と予め定めておいた目標値との偏差に基づいて各コイ
ルの入力を決定することを特徴とする。According to the present invention, there is provided a method for controlling an induction heating apparatus, comprising: a self-excited inverter, wherein the induction heating apparatus comprises a plurality of heating coils for performing induction heating while transferring an object to be heated. From the measured values of the output current of the inverter, the voltage between the output terminals, the oscillation frequency of each coil, and the material dimensions and material of the heated object, the temperature of the heated object at the output side of the induction heating device is estimated, The input of each coil is determined based on a deviation between the estimated value and a predetermined target value.
【０００６】また、本発明の誘導加熱装置の出側におけ
る被加熱体の温度の推定は、前記インバータの出力電
流、出力端子間電圧、各コイルでの発振周波数のそれぞ
れの測定値からインバータ出側のインピーダンスを算出
し、この算出結果から加熱コイルの抵抗分およびワーク
を求め、一方被加熱体の材料寸法および材質から、加熱
コイルの抵抗分およびワークとこの誘導加熱装置の出側
における被加熱体の温度の関係を予め実測により把握し
ておき、算出した加熱コイルの抵抗分およびワークの値
から推定することを特徴とする。The temperature of the object to be heated at the output side of the induction heating apparatus of the present invention is estimated from the measured values of the output current of the inverter, the voltage between output terminals, and the oscillation frequency of each coil. And the resistance of the heating coil and the work are obtained from the calculation result. On the other hand, the resistance of the heating coil and the work and the object to be heated at the exit side of the induction heating device are obtained from the material dimensions and the material of the object to be heated. The temperature relationship is previously grasped by actual measurement, and is estimated from the calculated resistance of the heating coil and the value of the work.
【０００７】[0007]
【発明の実施の形態】本発明の一実施例を詳細に説明す
る。図１は本発明に係わる誘導加熱装置の加熱コイル部
分の回路の一例を示す構成図で、１はコンバータ出力電
圧、２はインバータ回路、３は整合装置コンデンサ、４
は加熱コイル、５は加熱コイルのリアクタンス、６は加
熱コイルの抵抗分およびワーク、７はインバータ出力電
流、８はインバータ端子間電圧である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described in detail. FIG. 1 is a configuration diagram showing an example of a circuit of a heating coil portion of an induction heating device according to the present invention, wherein 1 is a converter output voltage, 2 is an inverter circuit, 3 is a matching device capacitor,
Is a heating coil, 5 is a reactance of the heating coil, 6 is a resistance component and a work of the heating coil, 7 is an inverter output current, and 8 is a voltage between inverter terminals.
【０００８】まず、インバータ出力電流７およびインバ
ータ端子間電圧８を測定し、これらからインバータ出側
のインピーダンスを算出する。この回路構成の場合、イ
ンバータ出側のインピーダンスＺは以下の式で表され
る。 Ｚ＝Ｌ／（Ｒ・Ｃ） ・・・（１） Ｚ：インバータ出側のインピーダンス Ｌ：加熱コイルのインダクタンス Ｒ：加熱コイルの抵抗分およびワーク Ｃ：整合装置のキャパシタンス 自励式インバータの場合、インバータ発振はインバータ
出側の回路で決定される共振周波数で動作する。インバ
ータの発振周波数ｆは次式で表される。First, the inverter output current 7 and the inverter terminal voltage 8 are measured, and the output impedance of the inverter is calculated from these. In the case of this circuit configuration, the impedance Z on the output side of the inverter is expressed by the following equation. Z = L / (RC) (1) Z: Impedance on the output side of inverter L: Inductance of heating coil R: Resistance of heating coil and work C: Capacitance of matching device In case of self-excited inverter, inverter Oscillation operates at the resonance frequency determined by the circuit on the output side of the inverter. The oscillation frequency f of the inverter is expressed by the following equation.
【０００９】 ｆ＝１／２π・（１／（Ｌ・Ｃ）−Ｒ2 ／Ｌ2 ）-1/2 ・・・（２） （１）、（２）式から加熱コイルの抵抗分およびワーク
Ｒを算出する。 Ｒ＝１／（Ｚ・Ｃ2 ＋１） ・・・（３） このＲは、被加熱材の寸法、材質および被加熱材温度に
依存する。いま被加熱材を鋼板とし、板厚、板幅、鋼中
成分を限定した場合、鋼板温度が高いとＲは大きくな
り、鋼板温度が低いとＲは小さくなる。被加熱材の種類
毎に予めＲの値と誘導加熱装置出側の鋼板温度との関係
を定量的に把握しておくことにより、Ｒが算出されれば
誘導加熱装置出側の鋼板温度の推定が可能となる。F = 1 / 2π · (1 / ( LC ) −R 2 / L 2 ) −1/2 (2) From the equations (1) and (2), the resistance of the heating coil and the work Calculate R. R = 1 / (Z · C 2 +1) (3) This R depends on the size and material of the material to be heated and the temperature of the material to be heated. Now, when the material to be heated is a steel sheet and the thickness, width and components in the steel are limited, R increases when the steel sheet temperature is high, and R decreases when the steel sheet temperature is low. By quantitatively grasping in advance the relationship between the value of R and the temperature of the steel sheet at the exit of the induction heating device for each type of material to be heated, if R is calculated, the temperature of the steel sheet at the exit of the induction heating device is estimated. Becomes possible.
【００１０】よって誘導加熱装置運転中にインバータ出
力電流７とインバータ端子間電圧８を測定することでイ
ンバータ出側インピーダンスＺを求め、（３）式により
Ｒを算出してＲと誘導加熱装置出側の鋼板温度との関係
から当該温度の推定を行う。そしてこの推定温度と目標
温度との偏差から、インバータの出力電圧を決定し、各
コイルの入力を操作することにより、誘導加熱装置出側
の鋼板温度の制御を行うのである。Therefore, the inverter output current 7 and the inverter terminal voltage 8 are measured during the operation of the induction heating device to obtain the inverter output impedance Z, and R is calculated by equation (3) to calculate R and the induction heating device output. The temperature is estimated from the relationship with the steel sheet temperature. Then, the output voltage of the inverter is determined from the deviation between the estimated temperature and the target temperature, and the input of each coil is operated to control the temperature of the steel sheet on the exit side of the induction heating device.
【００１１】図２は、本発明の一実施例である溶融亜鉛
めっき鋼板の合金化炉における誘導加熱装置の制御シス
テム構成図で、９は鋼板、10は溶融亜鉛ポット、11はシ
ンクロール、12はワイピングノズル、13は誘導加熱装
置、14は誘導加熱装置の電源、15は上位の計算機、16は
演算装置、17は誘導加熱装置の加熱コイル、18は整合装
置、19は電流測定器、20は電圧測定器である。FIG. 2 is a block diagram showing a control system of an induction heating apparatus in a galvanizing steel sheet galvanizing furnace according to one embodiment of the present invention, wherein 9 is a steel sheet, 10 is a molten zinc pot, 11 is a sink roll, and 12 is a sink roll. Is a wiping nozzle, 13 is an induction heating device, 14 is a power supply of the induction heating device, 15 is a higher-order computer, 16 is a computing device, 17 is a heating coil of the induction heating device, 18 is a matching device, 19 is a current measuring device, 20 Is a voltmeter.
【００１２】鋼板９は、溶融亜鉛ポット10内のシンクロ
ール11を経てポット鉛直上方にある亜鉛目付量を制御す
るためのワイピングノズル12および誘導加熱装置13に進
入する。ここに誘導加熱装置13は電源14、加熱コイル17
および整合装置18から構成される。誘導加熱装置13の出
側における鋼板９の板温を制御するには、まず上位の計
算機15から鋼板の寸法、規格等の被加熱材の情報、目標
温度、誘導加熱装置の初期設定電圧などを演算装置16に
送信する。演算装置16は、上位の計算機15の情報をもと
に設定電圧を誘導加熱装置の電源14に送信する。誘導加
熱装置13は、演算装置16からの設定電圧どおりに図１に
示したインバータ端子間電圧８を出力するインバータを
発振する。このときのインバータ出側電流、インバータ
出力電圧をそれぞれ電流測定器19、電圧測定器20で測定
し、この測定値を演算装置16に送信する。演算装置16
は、これらの測定値からインバータ出側のインピーダン
スＺを算出し、このＺから（３）式によりＲを算出す
る。The steel sheet 9 passes through a sink roll 11 in a molten zinc pot 10 and enters a wiping nozzle 12 and an induction heating device 13 for controlling the basis weight of zinc vertically above the pot. Here, the induction heating device 13 includes a power supply 14, a heating coil 17
And a matching device 18. In order to control the sheet temperature of the steel sheet 9 on the outlet side of the induction heating device 13, first, information of the material to be heated such as the size of the steel sheet, the standard, the target temperature, the initial setting voltage of the induction heating device, etc. This is transmitted to the arithmetic unit 16. The arithmetic unit 16 transmits the set voltage to the power supply 14 of the induction heating device based on the information of the host computer 15. The induction heating device 13 oscillates an inverter that outputs the inverter terminal voltage 8 shown in FIG. 1 according to the set voltage from the arithmetic device 16. At this time, the output current of the inverter and the output voltage of the inverter are measured by the current measuring device 19 and the voltage measuring device 20, respectively, and the measured values are transmitted to the arithmetic device 16. Arithmetic unit 16
Calculates the impedance Z on the output side of the inverter from these measured values, and calculates R from this Z according to equation (3).
【００１３】一方、予め実験によりＲと誘導加熱装置出
側板温との関係を求めておく。一例を図３に示す。算出
したＲと図３のグラフから誘導加熱装置出側板温を推定
し、目標温度との偏差により誘導加熱装置の電源14に送
信する設定電圧を変更する。電圧変更には例えばＰＩＤ
制御を用いる。図４は誘導加熱装置出側における鋼板の
板温の推移を示す。目標温度に精度よく追随しているこ
とがわかる。On the other hand, the relationship between R and the temperature of the sheet on the outlet side of the induction heating device is determined in advance by an experiment. An example is shown in FIG. The outlet plate temperature of the induction heating device is estimated from the calculated R and the graph of FIG. For example, PID
Use control. FIG. 4 shows the transition of the sheet temperature of the steel sheet on the exit side of the induction heating device. It can be seen that the target temperature is accurately followed.
【００１４】[0014]
【発明の効果】本発明によれば、被加熱材温度の測定困
難な場合においても精度よく温度制御をおこなうことが
できるという、すぐれた効果を奏する。According to the present invention, there is an excellent effect that the temperature can be accurately controlled even when the temperature of the material to be heated is difficult to measure.
【図１】本発明の誘導加熱装置の回路の一例を示す構成
図である。FIG. 1 is a configuration diagram showing an example of a circuit of an induction heating device according to the present invention.
【図２】本発明の一実施例である溶融亜鉛めっき鋼板の
合金化炉における誘導加熱装置の制御システム構成図で
ある。FIG. 2 is a control system configuration diagram of an induction heating device in a galvanizing steel sheet galvanizing steel sheet according to an embodiment of the present invention.
【図３】実施例におけるＲと誘導加熱装置出側板温との
関係を示すグラフである。FIG. 3 is a graph showing a relationship between R and an outlet plate temperature of an induction heating device in an example.
【図４】実施例における誘導加熱装置出側における鋼板
の板温の推移を示すグラフである。FIG. 4 is a graph showing changes in the sheet temperature of the steel sheet on the exit side of the induction heating device in the example.
１ コンバータ出力電圧 ２ インバータ回路 ３ 整合装置コンデンサ ４ 加熱コイル ５ 加熱コイルのリアクタンス ６ 加熱コイルの抵抗分およびワーク ７ インバータ出力電流 ８ インバータ端子間電圧 ９ 鋼板 10 溶融亜鉛ポット 11 シンクロール 12 ワイピングノズル 13 誘導加熱装置 14 誘導加熱装置の電源 15 上位の計算機 16 演算装置 17 誘導加熱装置の加熱コイル 18 整合装置 19 電流測定器 20 電圧測定器 DESCRIPTION OF SYMBOLS 1 Converter output voltage 2 Inverter circuit 3 Matching device capacitor 4 Heating coil 5 Heating coil reactance 6 Heating coil resistance and work 7 Inverter output current 8 Inverter terminal voltage 9 Steel plate 10 Molten zinc pot 11 Sink roll 12 Wiping nozzle 13 Induction Heating device 14 Power supply for induction heating device 15 Host computer 16 Computing device 17 Heating coil of induction heating device 18 Matching device 19 Current measuring device 20 Voltage measuring device
Claims (2)
移送しながら誘導加熱する複数の加熱コイルからなる誘
導加熱装置において、前記インバータの出力電流、出力
端子間電圧、各コイルでの発振周波数のそれぞれの測定
値と、被加熱体の材料寸法および材質から、この誘導加
熱装置の出側における被加熱体の温度を推定し、この推
定値と予め定めておいた目標値との偏差に基づいて各コ
イルの入力を決定することを特徴とする誘導加熱装置の
制御方法。1. An induction heating apparatus having a self-excited inverter and a plurality of heating coils for performing induction heating while transferring an object to be heated, comprising: an output current of the inverter, a voltage between output terminals, and oscillation of each coil. From the measured values of the frequency and the material dimensions and material of the object to be heated, the temperature of the object to be heated at the outlet side of the induction heating device is estimated, and the deviation between the estimated value and a predetermined target value is calculated. A method for controlling an induction heating apparatus, comprising: determining an input of each coil based on the input signal.
バータの出力電流、出力端子間電圧、各コイルでの発振
周波数のそれぞれの測定値からインバータ出側のインピ
ーダンスを算出し、この算出結果から加熱コイルの抵抗
分およびワークを求め、一方被加熱体の材料寸法および
材質から、加熱コイルの抵抗分およびワークとこの誘導
加熱装置の出側における被加熱体の温度の関係を予め実
測により把握しておき、算出した加熱コイルの抵抗分お
よびワークの値から推定することを特徴とする請求項１
に記載の誘導加熱装置の制御方法。2. The estimation of the temperature of the object to be heated includes calculating an impedance at an output side of the inverter from measured values of an output current of the inverter, a voltage between output terminals, and an oscillation frequency of each coil. The resistance of the heating coil and the workpiece are determined from the data, and the relationship between the resistance of the heating coil and the temperature of the workpiece and the temperature of the heated body at the exit side of the induction heating device is grasped in advance from the material dimensions and material of the heated body. 2. The method according to claim 1, wherein the estimation is performed based on the calculated resistance of the heating coil and the value of the workpiece.
3. The method for controlling an induction heating device according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34168096A JPH10183326A (en) | 1996-12-20 | 1996-12-20 | Control method for induction heating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP34168096A JPH10183326A (en) | 1996-12-20 | 1996-12-20 | Control method for induction heating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10183326A true JPH10183326A (en) | 1998-07-14 |
Family
ID=18347958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP34168096A Pending JPH10183326A (en) | 1996-12-20 | 1996-12-20 | Control method for induction heating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10183326A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100590832B1 (en) | 2004-09-02 | 2006-06-19 | 재단법인 포항산업과학연구원 | An Apparatus and A Method for Uniforming the Temperature at Edge of Plating Strip in Cold Mill line |
| WO2013167686A2 (en) | 2012-05-10 | 2013-11-14 | Behr-Hella Thermocontrol Gmbh | Device for inductively heating a heating element |
| WO2015170462A1 (en) * | 2014-05-06 | 2015-11-12 | 株式会社デンソー | Blower unit for air conditioner |
-
1996
- 1996-12-20 JP JP34168096A patent/JPH10183326A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100590832B1 (en) | 2004-09-02 | 2006-06-19 | 재단법인 포항산업과학연구원 | An Apparatus and A Method for Uniforming the Temperature at Edge of Plating Strip in Cold Mill line |
| WO2013167686A2 (en) | 2012-05-10 | 2013-11-14 | Behr-Hella Thermocontrol Gmbh | Device for inductively heating a heating element |
| CN104272863A (en) * | 2012-05-10 | 2015-01-07 | 贝洱海拉温控系统公司 | Device for inductively heating a heating element |
| EP2848088A2 (en) * | 2012-05-10 | 2015-03-18 | Behr-Hella Thermocontrol GmbH | Device for inductively heating a heating element |
| JP2015517715A (en) * | 2012-05-10 | 2015-06-22 | ベール−ヘラ サモコントロール ゲーエムベーハー | Device for induction heating of a heating element |
| US9615407B2 (en) | 2012-05-10 | 2017-04-04 | Behr-Hella Thermocontrol Gmbh | Device for inductively heating a heating element |
| WO2015170462A1 (en) * | 2014-05-06 | 2015-11-12 | 株式会社デンソー | Blower unit for air conditioner |
| JP2015212597A (en) * | 2014-05-06 | 2015-11-26 | 株式会社日本自動車部品総合研究所 | Blower unit for air-conditioning device |
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