JPH1129827A - Direct electric heating device of traveling material to be heated - Google Patents

Direct electric heating device of traveling material to be heated

Info

Publication number
JPH1129827A
JPH1129827A JP20099297A JP20099297A JPH1129827A JP H1129827 A JPH1129827 A JP H1129827A JP 20099297 A JP20099297 A JP 20099297A JP 20099297 A JP20099297 A JP 20099297A JP H1129827 A JPH1129827 A JP H1129827A
Authority
JP
Japan
Prior art keywords
heated
choke
current
winding
iron core
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.)
Granted
Application number
JP20099297A
Other languages
Japanese (ja)
Other versions
JP3497352B2 (en
Inventor
Masaru Fukuyama
勝 福山
Yuugo Yao
祐吾 八尾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Neturen Co Ltd
Original Assignee
Neturen Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Neturen Co Ltd filed Critical Neturen Co Ltd
Priority to JP20099297A priority Critical patent/JP3497352B2/en
Publication of JPH1129827A publication Critical patent/JPH1129827A/en
Application granted granted Critical
Publication of JP3497352B2 publication Critical patent/JP3497352B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Control Of Resistance Heating (AREA)
  • Heat Treatment Of Strip Materials And Filament Materials (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a device, in which it is no fear that excess current is conducted in a ground circuit even in the case of grounding a material to be heated at a position apart from a heating device, in the in-line transformer system electric heating device. SOLUTION: In the direct electric heating device, in which the material 1 to be heated continuously taveled, is passed through an iron core set in the transformer 2 and conductive roll sets 3, 4 are arranged at both sides of the transformer and electrically connected, the one side of conductive roll set 4 is grounded, and the first choke 9 wound by a coil having one turn to an iron core having an opening hole for passing through the material to be heated 1, is arranged at the opposite side of the transformer 2 to the other side of conductive roll set 3. Both end parts of the coil are connected with the one side of conductive roll set and the other side of conductive roll set, respectively and further, desirably, the second choke 11 composed of an iron core having an opening hole for passing through the material to be heated is arranged at the opposite side of the other side of conductive roll set 3 to the first choke 9.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は連続的に走行する鋼
線や鋼板などの被加熱材を熱処理などするために直接通
電して加熱する装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for heating a material to be heated such as a steel wire or a steel sheet which is continuously running, by directly applying a current to the material for heat treatment.

【0002】[0002]

【従来の技術】連続的に走行する被加熱材を加熱して焼
鈍などの熱処理を行なう工程は多数実施されているが、
トンネル式の加熱炉を通過させて加熱するごく一般的な
方式のほかに直接通電加熱が用いられることがある。直
接通電加熱は図6に示すように走行する被加熱材1の少
なくとも2箇所に通電ロール32、33を接触させ、そ
の間に電源31を接続することにより被加熱材1自体を
電気抵抗により発熱させるものである。直接通電加熱は
輻射や対流に伝熱を依存する加熱炉に比較して熱効率が
著しく高く、またきわめて急速に材料を昇温でき、設備
も比較的安価であるという利点を有する。
2. Description of the Related Art There are many processes for heating a continuously running material to be subjected to heat treatment such as annealing.
In addition to the very common method of heating by passing through a tunnel type heating furnace, direct current heating may be used. As shown in FIG. 6, the direct current heating causes the current-carrying rolls 32 and 33 to come into contact with at least two places on the running material 1 to be heated, and the power supply 31 is connected between the rollers, thereby causing the material 1 itself to generate heat by electric resistance. Things. Direct current heating has the advantages of significantly higher thermal efficiency than a heating furnace that relies on heat transfer to radiation and convection, the ability to heat materials very quickly, and relatively inexpensive equipment.

【0003】直接通電加熱は上記のように原理的には最
低限電源と2個の通電ロールがあれば行なえるものの実
際の設備としてはそれだけでは不十分である。すなわち
通電ロール間には、被加熱材の加熱に必要な電圧がかか
っており、通電ロールより外側で被加熱材を接地するロ
ーラーなどがあると接地を通して電流が流れてしまい、
通電ロール間以外の部分も加熱されてしまう。また図6
に示すように電源31の変圧器の2次巻線の中点を接地
34して電圧を振り分けても通電ロール32、33の部
分の対地電位はたとえば100Vといった電圧になるこ
ともあり、なんらかの対策を講じないと通電加熱装置か
らずっと離れたところで被加熱材に接触しても感電する
といったことになる。
As mentioned above, direct energization heating can be performed in principle with at least a power source and two energization rolls, but it is not sufficient for actual equipment. That is, the voltage required for heating the material to be heated is applied between the energizing rolls, and if there is a roller or the like that grounds the material to be heated outside the energizing roll, a current flows through the ground,
Parts other than between the energizing rolls are also heated. FIG.
As shown in the above, even if the voltage is distributed by grounding the middle point of the secondary winding of the transformer of the power supply 31 and the voltage is distributed, the ground potential of the portions of the energizing rolls 32 and 33 may be a voltage of 100 V, for example. If this is not done, an electric shock will be caused even if the member comes into contact with the material to be heated far away from the electric heating device.

【0004】上記のようなことを防止するため実際の設
備においては図6に示すように対地電位が高い通電ロー
ル32、33の外側の部分に接地ロール35、36を設
け、これより外側の部分の被加熱材には通電加熱の電圧
が及ばないようにすることが行なわれる。そしてこのま
までは通電ロール32、33と接地ロール35、36間
の被加熱材1に大電流が流れてしまうので、その間にチ
ョーク37、38すなわち限流リアクトルを設けて電流
を制限している。このチョークは被加熱材1を取り巻く
磁路を有し、被加熱材が貫通する窓が開いた鉄心そのも
のである。
In order to prevent the above-mentioned problems, in actual equipment, as shown in FIG. 6, grounding rolls 35, 36 are provided outside the energizing rolls 32, 33 having a high ground potential, and the outer rolls are provided. The material to be heated is made so that the voltage of the electric heating does not reach it. In this state, a large current flows through the material 1 to be heated between the energizing rolls 32 and 33 and the grounding rolls 35 and 36. Therefore, chokes 37 and 38, that is, current limiting reactors are provided therebetween to limit the current. The choke has a magnetic path surrounding the material 1 to be heated, and is an iron core having an open window through which the material to be heated passes.

【0005】ところで特開昭63−128125号およ
び特開平1−142032号には連続的に走行する線材
または帯材の直接通電加熱装置の別の方式のものが開示
されている。それは図7に示すように電源に接続する巻
線を設けた変圧器2の鉄心の窓に被加熱材1を貫通さ
せ、この変圧器の上流・下流両側にそれぞれ被加熱材に
接触する通電ロール3、4を設けてその間をブスバー5
など低抵抗の回路で結線したものである。この装置にお
いては被加熱材1自体が変圧器2の2次コイルを形成す
ることになり、被加熱材1に発生した起電力により通電
ロール間のブスバー5を通して電流が流れて加熱される
ことになる。このように通電加熱装置の本体に変圧器が
形成されているとみなせるので、以下においてはこれを
インライン変圧器方式と称することにする。これに対し
先に説明した従来からの通電加熱装置を区別するときに
は外部電源方式ということにする。このインライン変圧
器方式の装置においては両方の通電ロール3、4を接地
39、40することができるので、前記の外部電源方式
においては必要な接地ロールが本質的に不要となる。し
たがって設備が簡単になり、また通電ロールの部分に触
れても感電するおそれがなく安全であり優れた方法であ
る。
Japanese Unexamined Patent Publications Nos. 63-128125 and 1-142032 disclose another type of direct current heating apparatus for continuously running wires or strips. As shown in FIG. 7, a heated material 1 is passed through a window of an iron core of a transformer 2 provided with a winding connected to a power supply, and an energizing roll contacting the heated material on both the upstream and downstream sides of the transformer. 3 and 4, with a busbar 5 between them
These are connected by a low-resistance circuit. In this device, the material to be heated 1 itself forms the secondary coil of the transformer 2, and the electromotive force generated in the material to be heated 1 causes the current to flow through the bus bar 5 between the energizing rolls to be heated. Become. Since it can be considered that a transformer is formed in the main body of the current-carrying heating device, this is hereinafter referred to as an in-line transformer system. On the other hand, the external power supply system is used to distinguish the conventional energization heating device described above. In this in-line transformer type device, both of the energizing rolls 3 and 4 can be grounded 39 and 40, so that the necessary grounding roll is essentially unnecessary in the aforementioned external power supply type. Therefore, the equipment is simplified, and there is no danger of electric shock even when the electric roll is touched. This is a safe and excellent method.

【0006】[0006]

【発明が解決しようとする課題】ところでインライン変
圧器方式においては上記のように原理的には両方の通電
ロール3、4の箇所でそれぞれ接地39、40して不都
合ないのであるが、接地の状態によっては両方の通電ロ
ール間を結合するブスバー5のほかにかなりの接地電流
41がバイパスすることがある。これはそれぞれの接地
39、40の接地抵抗が低いとき、たとえば両方の通電
ロールとも建屋構造物に接触した場合に構造物の鉄骨を
通じて低抵抗の回路が形成されているときなどに顕著に
なる。ブスバーの電流自体がたとえば数千アンペアとい
った大電流なのでその一部が分流してもかなりの大電流
になり、ロール類のベアリングの寿命に悪影響を及ぼし
たり、場合によっては構造物の継手のボルトが過熱した
りすることも考えられる。したがって一方の通電ロー
ル、たとえば出側の通電ロール4の位置でのみ接地する
のが好ましい。
As described above, in the in-line transformer system, there is no problem in principle because the grounds 39 and 40 are provided at both the energizing rolls 3 and 4 as described above. In some cases, a considerable ground current 41 may be bypassed in addition to the bus bar 5 connecting between the two current-carrying rolls. This becomes remarkable when the ground resistance of each of the grounds 39 and 40 is low, for example, when a low-resistance circuit is formed through the steel frame of the building when both of the energizing rolls come into contact with the building structure. Since the busbar current itself is a large current of, for example, several thousand amperes, even if a part of the current is shunted, the current becomes considerably large, adversely affecting the life of the roll bearings, and in some cases, the bolts of the joints of the structure may be damaged. Overheating is also conceivable. Therefore, it is preferable to ground only at the position of one energizing roll, for example, the position of the energizing roll 4 on the exit side.

【0007】このような理由でたとえば図7において一
方の通電ロール4だけを接地40した場合、他方の通電
ロール3の部分の被加熱材には数V程度の低電圧ではあ
るが対地電位が現われる。これはブスバーに大電流が流
れることによる電圧降下にさらに他方の通電ロール3の
ブラシの電圧降下が加わったものである。この場合、ブ
ラシの電圧降下は抵抗分、ブスバーの電圧降下はリアク
タンス分が主なのでこれらのベクトル和ということにな
る。なお前記一方の通電ロール4の部分の接地40はブ
スバー5の一端で行なうのが普通なので、この場合こち
ら側の被加熱材にも通電ロール4のブラシの電圧降下分
の対地電位が現われるがこれは小さいので無視できる。
For this reason, for example, in FIG. 7, when only one energizing roll 4 is grounded 40, the material to be heated in the other energizing roll 3 has a low potential of about several volts, but a ground potential appears. . This is obtained by adding a voltage drop caused by a large current flowing through the bus bar to a voltage drop of the brush of the other energizing roll 3. In this case, the voltage drop of the brush is a resistance component, and the voltage drop of the bus bar is a reactance component. Since the grounding 40 of the one energizing roll 4 is normally performed at one end of the bus bar 5, the ground potential corresponding to the voltage drop of the brush of the energizing roll 4 also appears on the material to be heated in this case. Is small and can be ignored.

【0008】上記の他方の通電ロール3の対地電位をそ
のままにしておくと、他方の通電ロール側の別の場所で
被加熱材1が低抵抗で接地されたとき、前記の両方の通
電ロールを接地した場合と同じ状況になってブスバー5
の電流と並行にかなりの接地電流が流れることが考えら
れる。この対策としては図7の接地してない通電ロール
より上流側の被加熱材と接するたとえばキャリヤロー
ル、デフレクタロール、ピンチロール、巻き取り機等の
プロセス機器を電気絶縁することが考えられる。しかし
ながら連続走行する被加熱材と接しながらこれを搬送あ
るいは何らかの処理を行なう機器の数は非常に多いのが
普通である。したがって電気絶縁によって対処しようと
すると建設費の増大を招くと共に絶縁を維持するための
保全作業のコストも必要となる。
If the ground potential of the other energizing roll 3 is left as it is, when the material to be heated 1 is grounded with low resistance at another place on the other energizing roll side, both of the energizing rolls are connected. Busbar 5
It is conceivable that a considerable ground current flows in parallel with this current. As a countermeasure, it is conceivable to electrically insulate process equipment such as a carrier roll, a deflector roll, a pinch roll, and a winding machine that are in contact with the material to be heated upstream of the ungrounded current-carrying roll in FIG. However, the number of devices that transport or perform some processing while being in contact with the continuously heated material is usually very large. Therefore, if the measures are taken by electric insulation, the construction cost is increased and the cost of maintenance work for maintaining the insulation is also required.

【0009】上記のようなことから本発明は図7に示し
たようなインライン変圧器方式の通電加熱装置におい
て、被加熱材が加熱装置から離れた位置で接地された場
合でも接地回路に過大な電流が流れるおそれのないもの
を提供することを課題とする。特に通電加熱装置はそれ
だけで単独使用されることは少なく、一連のプロセスを
実行する中の一つの装置として設けられることが多いの
で、これに隣接する他の装置におけるロール類の接地状
況などがどのようになっていても不都合が生ずることが
ないように当初から設計しておくことが接地電流による
ベアリング等の焼損事故防止等のため好ましい。このよ
うにして置かないと、初めに設備を設置したときには前
後の装置の状況を確認できて不都合が生じなくても、後
日隣接する装置を改造したときに不測の問題を生ずる場
合もあるからである。本発明はこのような状況に鑑みて
前後の他の装置を含めて接地状況がどのようにあっても
確実に対処できるものを低コストで提供する。
In view of the above, the present invention provides an in-line transformer-type current-carrying heating apparatus as shown in FIG. 7 which has an excessively large grounding circuit even when the material to be heated is grounded at a position distant from the heating apparatus. It is an object to provide a device in which current does not flow. In particular, the electric heating device is rarely used alone, and is often provided as one device for executing a series of processes. It is preferable to design from the beginning so as not to cause any inconvenience even if it is as described above, for example, to prevent the bearings and the like from burning due to ground current. If not installed in this way, even when the equipment is first installed, the situation of the surrounding devices can be checked and no inconvenience will occur, but unexpected problems may occur when the adjacent equipment is modified at a later date. is there. In view of such a situation, the present invention provides a low-cost device that can reliably cope with any grounding situation including other devices before and after.

【0010】[0010]

【課題を解決するための手段】インライン変圧器方式に
おいて上記のような問題の発生を防止する手段として
は、先に図6によって説明した外部電源方式の場合と同
様に接地されていない側の通電ロールの外側には接地ロ
ールを設け、これと通電ロールとの間にチョークを設け
ればよい。しかしこのようにすることによってインライ
ン変圧器方式においても片側の通電ロール側では接地ロ
ールとチョークが必要となり、外部電源方式に比較して
の利点が一部失われることになる。ただインライン変圧
器方式ではチョークが負担しなければならない電圧はた
とえば5Vといった値で、外部電源方式の場合のたとえ
ば250V程度よりはるかに小さいので、これの鉄心は
ずっと小さいもので済む。したがってこのように接地ロ
ール等が必要になってもインライン変圧器方式の利益は
かなり大きいことは事実である。
As means for preventing the above-mentioned problems from occurring in the in-line transformer system, the same method as in the case of the external power supply system described with reference to FIG. A grounding roll may be provided outside the roll, and a choke may be provided between the ground roll and the energizing roll. However, in this way, even in the in-line transformer system, a grounding roll and a choke are required on one energizing roll side, and some of the advantages as compared with the external power supply system are lost. However, in the in-line transformer system, the voltage that the choke must bear is, for example, 5 V, which is much smaller than, for example, about 250 V in the case of the external power supply system, so that the iron core of the transformer is much smaller. Therefore, it is a fact that the benefit of the in-line transformer system is considerably large even if such a ground roll is required.

【0011】本発明は上記の被加熱材に現われる対地電
位の問題ひいては接地されていない通電ロール側の被加
熱材と接するプロセスライン機器に流れる電流による問
題を低コストで解決するものであって、連続的に走行す
る被加熱材を電源に接続する巻線を設けた変圧器の鉄心
に貫通させ、前記変圧器の両側においてそれぞれ被加熱
材に接触する通電ロールを設けてその間を導電材で結線
した直接通電加熱装置において、前記通電ロールのうち
の一方の通電ロールを接地するとともに、前記被加熱材
が貫通する窓を有する鉄心に巻回数1回の巻線が巻かれ
たチョークを他方の通電ロールの前記変圧器と反対側に
設け、前記巻線に流れる電流によりチョークに発生した
磁束によって被加熱材に誘起される電圧が被加熱材の対
地電位を相殺する極性に巻線の両端を前記一方の通電ロ
ールと他方の通電ロールとに接続したことを特徴とする
走行する被加熱材の直接通電加熱装置である。
The present invention solves the above-mentioned problem of the ground potential which appears in the material to be heated and the problem caused by the current flowing in the process line equipment in contact with the material to be heated on the side of the current-carrying roll which is not grounded, at low cost. A continuously heated material to be heated is passed through an iron core of a transformer provided with a winding for connecting to a power supply, and energizing rolls are provided on both sides of the transformer, which are in contact with the material to be heated, respectively, and a conductive material is connected therebetween. In the direct current heating device described above, one of the current-carrying rolls is grounded, and the other of the current-carrying coils is wound on a core having a window through which the material to be heated is wound by one turn and the other of the current-carrying rolls is energized. The voltage induced on the material to be heated by the magnetic flux generated in the choke by the current flowing through the winding is provided on the opposite side of the transformer from the roll, and cancels the ground potential of the material to be heated. It is a direct resistance heating apparatus of the heated material to travel, characterized in that the ends of the windings connected to the said one current supply roll and the other conductive rolls sexual.

【0012】また、連続的に走行する被加熱材を電源に
接続する巻線を設けた変圧器の鉄心に貫通させ、前記変
圧器の両側においてそれぞれ被加熱材に接触する通電ロ
ールを設けてその間を導電材で結線した直接通電加熱装
置において、前記通電ロールのうちの一方の通電ロール
を接地するとともに、前記被加熱材が貫通する窓を有す
る鉄心に巻回数1回の巻線が巻かれた第1のチョークを
他方の通電ロールの前記変圧器と反対側に設け、前記巻
線に流れる電流によりチョークに発生した磁束によって
被加熱材に誘起される電圧が被加熱材の対地電位を相殺
する極性に巻線の両端を前記一方の通電ロールと他方の
通電ロールとに接続し、さらに前記被加熱材が貫通する
窓を有する鉄心よりなる第2のチョークを第1のチョー
クの前記他方の通電ロールと反対側に設けたことを特徴
とする走行する被加熱材の直接通電加熱装置である。ま
たここにおいて、第1のチョークと第2のチョークと
は、貫通する被加熱材の走行方向に積層された鉄心の積
層厚さの一部分に巻線を設けて第1のチョークの部分と
し、残りの積層厚さの部分を第2のチョークの部分とす
ることにより、一体になったものであることも特徴とす
る。
[0012] Further, a continuously running material to be heated is passed through an iron core of a transformer provided with a winding for connecting to a power supply, and energizing rolls are provided on both sides of the transformer, respectively, in contact with the material to be heated. In the direct current heating device in which the conductive material is connected, one of the current-carrying rolls is grounded, and one turn is wound around an iron core having a window through which the material to be heated passes. A first choke is provided on the other side of the current-carrying roll opposite to the transformer, and a voltage induced in the material to be heated by magnetic flux generated in the choke due to a current flowing through the winding cancels a ground potential of the material to be heated. The opposite ends of the winding are connected to the one energizing roll and the other energizing roll, and a second choke made of an iron core having a window through which the material to be heated penetrates is connected to the other end of the first choke. It is a direct resistance heating apparatus of the heated material to travel, characterized in that provided on the roll opposite. Further, here, the first choke and the second choke are defined as a first choke portion by providing a winding on a part of a laminated thickness of an iron core laminated in a traveling direction of a material to be penetrated and forming a remaining portion. It is also characterized in that they are integrated by making the portion of the lamination thickness of the second choke portion.

【0013】[0013]

【発明の実施の形態】図1は本発明の直接通電加熱装置
の例を示すものである。1は連続的に走行する被加熱材
であって、電源に接続する1次巻線を設けた変圧器2の
鉄心を貫通している。この変圧器の上流・下流両側には
それぞれ被加熱材に接触する通電ロール3、4が設けら
れ、その間を低電気抵抗のブスバー5で結線して直接通
電加熱装置が構成されている。そして本発明の装置にお
いては前記通電ロールのうちの一方の通電ロール4を接
地8するとともに、他方の接地しない通電ロール3の変
圧器2と反対側には、被加熱材1が貫通する窓を有する
鉄心に巻回数1回の巻線7が巻かれたチョーク6を設け
る。この巻線の両端は一方の通電ロール3と他方の通電
ロール4とに巻線に流れる電流によりチョークに発生し
た磁束によって被加熱材に誘起される電圧が被加熱材の
対地電位を相殺する極性に接続する。以下においては便
宜上、下流側すなわち高温側の通電ロール4の部分が接
地されて、上流側すなわち低温側の通電ロール3に隣接
してチョーク6が設けられているとして説明するが、そ
の逆でも本発明の本質には関係なく、差し支えない。
FIG. 1 shows an example of a direct current heating apparatus according to the present invention. Reference numeral 1 denotes a continuously running material to be heated, which passes through an iron core of a transformer 2 provided with a primary winding connected to a power supply. On both the upstream and downstream sides of the transformer, there are provided energizing rolls 3 and 4 which are in contact with the material to be heated, respectively, and are connected by a bus bar 5 having a low electric resistance to constitute a direct energizing heating device. In the apparatus of the present invention, one energizing roll 4 of the energizing rolls is grounded 8, and the other side of the energizing roll 3, which is not grounded, is provided with a window through which the material 1 to be heated penetrates. A choke 6 in which a winding 7 with one turn is wound around the iron core is provided. Both ends of this winding have polarities such that the voltage induced in the material to be heated by the magnetic flux generated in the choke by the current flowing through the windings of the current-carrying roll 3 and the other current-carrying roll 4 cancels the ground potential of the material to be heated. Connect to In the following, for convenience, it is assumed that the portion of the energizing roll 4 on the downstream side, that is, the high-temperature side, is grounded, and the choke 6 is provided adjacent to the energizing roll 3 on the upstream side, that is, the low-temperature side. Irrespective of the essence of the invention, it does not matter.

【0014】このように構成することにより上流側の通
電ロール3の位置における被加熱材1の対地電位VC
相殺する誘起電圧を被加熱材のチョーク6を貫通する部
分に発生させることができる。すなわちこの場合、チョ
ーク6は巻線7に流れる電流により励磁され、チョーク
鉄心内に磁束が発生する。この磁束は巻線と同じくチョ
ーク窓内を貫通している被加熱材1とも鎖交するため、
被加熱材には巻線7の両端の電圧に等しい電圧を誘起す
る。これにより前述の従来技術においては必要であった
接地ロールを設けることなしに被加熱材の対地電位VC
を相殺することができる。
With this configuration, an induced voltage that cancels the ground potential V C of the material to be heated 1 at the position of the current-carrying roll 3 on the upstream side can be generated in a portion of the material to be heated that penetrates the choke 6. . That is, in this case, the choke 6 is excited by the current flowing through the winding 7, and a magnetic flux is generated in the choke core. Since this magnetic flux links with the heated material 1 penetrating through the choke window as well as the winding,
A voltage equal to the voltage across the winding 7 is induced in the material to be heated. As a result, the ground potential V C of the material to be heated can be provided without providing a grounding roll which is necessary in the above-described prior art.
Can be offset.

【0015】チョーク6の巻線7に流れる電流I1 はチ
ョークの鉄心の励磁電流そのものであり、これによって
発生した磁束を微分した逆起電力が上流側通電ロール3
における対地電位VC に対抗することになる。実際の設
計の順序としてはまずチョークが発生すべき逆起電力E
[V](実効値)が与えられ、これに見合う磁束Φ[W
b]が下記(1)式で計算できるので、鉄心の材料に応
じて設計磁束密度B[T]を定めれば鉄心の断面積S
[m2 ]が下記(2)式で求まる。 21/2 E=2πfNΦ ・・・・・・(1) S=Φ/B ・・・・・・(2) ただしfは周波数、Nはコイルの巻数(=1)
The current I 1 flowing through the winding 7 of the choke 6 is the exciting current itself of the iron core of the choke.
It will counter the ground potential V C at. As an actual design sequence, first, the back electromotive force E at which choke should occur
[V] (effective value), and the corresponding magnetic flux Φ [W
b] can be calculated by the following equation (1), and if the design magnetic flux density B [T] is determined according to the material of the iron core, the sectional area S of the iron core
[M 2 ] is obtained by the following equation (2). 2 1/2 E = 2πfNΦ (1) S = Φ / B (2) where f is the frequency and N is the number of turns of the coil (= 1)

【0016】一方、被加熱材が貫通すべき鉄心の窓の寸
法により磁路長L[m]が決まるから、これと透磁率の
データにより設計磁束密度Bを得るための励磁電流I
[A](実効値)が下記(3)式で計算できる。 I=L・B/(μ0 μr N・21/2 ) ・・・・・(3) ただしμ0 は真空の透磁率(=4π×10-7[H/
m])、μr は鉄心の比透磁率
On the other hand, since the magnetic path length L [m] is determined by the size of the window of the iron core through which the material to be heated penetrates, the exciting current I to obtain the design magnetic flux density B is obtained from this and the data of the magnetic permeability.
[A] (effective value) can be calculated by the following equation (3). I = L · B / (μ 0 μ r N · 2 1/2) ····· (3) However mu 0 is the permeability of vacuum (= 4π × 10 -7 [H /
m]), μ r is the relative permeability of the iron core

【0017】本発明に使用するチョークは巻線の巻数は
1回しかあり得ないから励磁アンペア・ターンそのもの
が励磁電流になる。したがって一般の変圧器の設計のよ
うに巻線の巻数で励磁電流を調節することはできないか
ら、巻線7の電流I1 はたとえば30Aといったかなり
大きな値になるように設計される。インライン変圧器方
式の場合の通電ロールの部位の対地電位は先にも述べた
ようにたとえば5Vと、外部電源方式の場合のたとえば
250Vといった値よりずっと低いので、チョークはは
るかに少ない磁束、言い換えればはるかに小断面積の鉄
心ですむことになる。
Since the choke used in the present invention can have only one winding, the exciting ampere turn itself becomes the exciting current. Therefore can not be possible to adjust the exciting current by the turns of the winding, as a general transformer design, current I 1 of the winding 7 is designed to be considerably large value, e.g. 30A. Since the ground potential at the portion of the energizing roll in the case of the in-line transformer system is, for example, 5 V as described above, which is much lower than the value of, for example, 250 V in the case of the external power system, the choke has much less magnetic flux, in other words, An iron core with a much smaller cross-sectional area will suffice.

【0018】図2は図1の装置における等価回路である
が、チョーク6のリアクタンス13と巻線7に接続され
る線路のインピーダンス14とが直列に接続され、これ
に上流側の通電ロール3の対地電位VC が掛かり、電流
1 が流れることになる。チョーク6によって被加熱材
1に誘起される電圧はリアクタンス13に掛かっている
電圧と同じである。すなわち図1中に記載したようにチ
ョーク6の入り側における巻線の回路の電位と被加熱材
の電位は常に同じV1 である。したがって図2のごとく
リアクタンス13は1つのものとして表現され、図2中
に記載した点の電位がV1 となる。またこのときの電流
1 は巻線の回路だけでなく被加熱材にも電流が流れて
いるときにはこれらの合計である。また図2中に記載し
た以外の線路のインピーダンスは距離が短いことから無
視している。このように巻線7に接続される線路のイン
ピーダンス14による電圧降下があるので、チョーク6
の上流位置での被加熱材の対地電位V1 は完全にゼロに
はならずわずかの電圧が残ることになる。この電圧V1
は通電ロールの部位の対地電位VC がたとえば5Vの場
合において、0.3Vといった値である。なおこのイン
ピーダンス14は抵抗分は小さく、ほとんどがリアクタ
ンス分である。
FIG. 2 shows an equivalent circuit of the apparatus shown in FIG. 1. The reactance 13 of the choke 6 and the impedance 14 of the line connected to the winding 7 are connected in series. The ground potential V C is applied, and the current I 1 flows. The voltage induced in the material to be heated 1 by the choke 6 is the same as the voltage applied to the reactance 13. That potential and the potential of the material to be heated the circuit of the windings in the inlet side of the choke 6 as described in Figure 1 is always the same V 1. Therefore reactance 13 as in FIG. 2 are represented as one, the potential of the point described in Figure 2 becomes V 1. The current I 1 at this time is their sum when the current in the material to be heated not only circuit winding is flowing. The impedances of the lines other than those described in FIG. 2 are neglected because the distance is short. Since there is a voltage drop due to the impedance 14 of the line connected to the winding 7, the choke 6
Ground potential V 1 of the material to be heated at a position upstream of the completely so that only the voltage remains not become zero. This voltage V 1
Is 0.3 V when the ground potential V C at the portion of the energizing roll is 5 V, for example. The impedance 14 has a small resistance, and is mostly a reactance.

【0019】上記の場合にチョーク6の上流側で被加熱
材1が接地されたとき、図2に示すようにこの被加熱材
の接地16と下流側の通電ロールの接地15との間で電
流Ie が流れる。この場合巻線に接続される線路のイン
ピーダンス14との並列の回路となるので、電流はこれ
と接地回路のインピーダンスとの比に依存して分配され
る。このため接地回路の抵抗が比較的大きければ電流I
e はさほど大きくならず問題ない。したがって通電加熱
装置に付帯する設備などにおいて予想される接地回路の
抵抗があまり低くなければ図1のような装置でよいこと
になる。
In the above case, when the material 1 to be heated is grounded on the upstream side of the choke 6, a current flows between the grounding 16 of the material to be heated and the grounding 15 of the current-carrying roll as shown in FIG. I e flows. In this case, the current is distributed depending on the ratio between the impedance of the ground circuit and the impedance of the line connected to the winding. Therefore, if the resistance of the ground circuit is relatively large, the current I
e is not so large and there is no problem. Therefore, if the resistance of the ground circuit expected in the equipment attached to the electric heating device is not very low, the device as shown in FIG. 1 can be used.

【0020】ところで図1の装置においてこれの上流位
置での被加熱材の接地回路の抵抗が低い場合、たとえば
チョークの巻線に接続される線路のインピーダンスと同
じであれば1対1に分配される。チョークの巻線の電流
は先に述べたように通常たとえば30Aといった値に設
計されるので、この場合接地回路の電流は15Aという
ことになる。このような電流になるとベアリングの寿命
への悪影響も考えられるので、通電加熱装置に付帯する
設備が複雑でまた将来これの改造が予想されるような場
合などにおいては、接地抵抗が低くなっても接地回路の
電流を十分に低くするようにしておくことが好ましいと
いえる。
In the apparatus shown in FIG. 1, when the resistance of the grounding circuit of the material to be heated at the upstream position thereof is low, for example, if the impedance of the line connected to the winding of the choke is the same, distribution is made on a one-to-one basis. You. As described above, the current of the winding of the choke is usually designed to have a value of, for example, 30 A. In this case, the current of the ground circuit is 15 A. Such a current may have an adverse effect on the life of the bearing, so if the equipment attached to the current-carrying heating device is complicated and if it is expected to be modified in the future, even if the ground resistance becomes low, It can be said that it is preferable to make the current of the ground circuit sufficiently low.

【0021】図1の通電加熱装置の場合、接地回路の電
流を制限するにはチョークの鉄心の断面積を大にすれば
よいが、電流を十分に下げるには大きな鉄心が必要にな
る。たとえば図2において、接地16の回路のインピー
ダンスがチョークの巻線に接続される線路のインピーダ
ンス14と同じの場合、先の例で接地回路の電流Ie
15Aとなるところ、3Aに制限することを想定する。
先に例として述べたように通電ロールの対地電位VC
5Vでチョークの巻線に接続される線路のインピーダン
ス14に掛かる電圧V1 が0.3Vの場合、位相が同じ
とすればチョークによる逆起電力は4.7Vになる。こ
の場合に接地回路の電流Ie を3Aにするには、巻線の
方にも同じ3Aの電流が分流するとすると6A、すなわ
ち先の状態の5分の1の電流で対地電位VC を負担しな
ければならない。巻線回路の電流I1 が小さくなればこ
れによって発生する線路のインピーダンス14両端の電
圧V1 は小さくなって無視できるから、チョークは対地
電位VC である5Vの逆起電力を発生させる必要があ
る。つまり先の5分の1の電流で先の4.7Vより大き
い5Vの逆起電力を発生させる必要があり、(5V÷
4.7V)×5=5.3で約5倍の鉄心が必要になる。
In the case of the current-carrying heating apparatus shown in FIG. 1, the current in the grounding circuit is limited by increasing the cross-sectional area of the iron core of the choke, but a large iron core is required to sufficiently reduce the current. For example, in FIG. 2, when the impedance of the circuit of the ground 16 is the same as the impedance 14 of the line connected to the winding of the choke, the current I e of the ground circuit is 15 A in the above example, and is limited to 3 A. Is assumed.
As described above as an example, when the ground potential V C of the energizing roll is 5 V and the voltage V 1 applied to the impedance 14 of the line connected to the winding of the choke is 0.3 V, if the phase is the same, the choke is used. The back electromotive force is 4.7V. To the 3A current I e of the ground circuit in this case, when a current of the same 3A towards windings shunts 6A, i.e. bears the potential to ground V C at one-fifth of the current of the previous state Must. Since the voltage V 1 of the impedance 14 across the line current I 1 winding circuit occurs due to this the smaller is negligibly smaller, chokes is necessary to generate a counter electromotive force of 5V is ground potential V C is there. In other words, it is necessary to generate a back electromotive force of 5 V which is larger than the previous 4.7 V by the current of 1/5, (5 V ÷
(4.7V) × 5 = 5.3 and about 5 times the iron core is required.

【0022】このように図1の装置で被加熱材が上流の
どこかで低い接地抵抗で接地したときのことを想定して
チョークを設計するとかなり大きなものが必要になる。
そこで図3はこのような問題を解決した本発明の直接通
電加熱装置の例をを示したものである。被加熱材1、変
圧器2、通電ロール3、4およびブスバー5に係る構成
は先に示した図1の場合と同じである。そして前記通電
ロールのうちの一方の通電ロール4を接地8するととも
に、他方の接地しない通電ロール3の変圧器2と反対側
には、被加熱材1が貫通する窓を有する鉄心に巻回数1
回の巻線10が巻かれた第1のチョーク9を設ける。こ
の巻線の両端は一方の通電ロール3と他方の通電ロール
4とに被加熱材の対地電位を相殺する極性に接続する。
この第1のチョーク9は図1に示した装置におけるチョ
ーク6と構成、機能とも同じであり、鉄心の寸法の設計
なども同じ考え方で行なえる。図3の装置においてはさ
らに被加熱材1が貫通する窓を有する鉄心よりなる第2
のチョーク11を第1のチョーク9の前記他方の通電ロ
ール4と反対側、すなわちこの例では上流側に設ける。
この第2のチョーク11は通常第1のチョーク9に隣接
してか、後に説明するように第1のチョークと一体のも
のとして設けられる。第2のチョーク11は第1のチョ
ーク9と異なり巻線は有さず、単に被加熱材が貫通する
だけである。
As described above, if the choke is designed on the assumption that the material to be heated is grounded somewhere upstream with a low grounding resistance, a considerably large choke is required.
Therefore, FIG. 3 shows an example of the direct current heating device of the present invention which solves such a problem. The configuration relating to the material 1 to be heated, the transformer 2, the current-carrying rolls 3, 4 and the bus bar 5 is the same as in the case of FIG. One of the current-carrying rolls 4 is grounded 8, and the other of the current-carrying rolls 3, which is not grounded, on the side opposite to the transformer 2, is wound around an iron core having a window through which a material 1 to be heated passes.
A first choke 9 on which the winding 10 is wound is provided. Both ends of this winding are connected to one energizing roll 3 and the other energizing roll 4 with polarities that cancel the ground potential of the material to be heated.
This first choke 9 has the same configuration and function as the choke 6 in the device shown in FIG. 1, and the design of the dimensions of the iron core can be performed in the same way. The apparatus shown in FIG. 3 further comprises a second core made of an iron core having a window through which the material to be heated 1 passes.
Is provided on the opposite side of the first choke 9 from the other energizing roll 4, that is, on the upstream side in this example.
This second choke 11 is usually provided adjacent to the first choke 9 or as integral with the first choke, as will be explained later. Unlike the first choke 9, the second choke 11 does not have a winding, and simply penetrates the material to be heated.

【0023】図4は図3の装置の等価回路を示す図であ
る。先の図2と同様に第1のチョーク9のリアクタンス
17と巻線10に接続される線路のインピーダンス18
とが直列に接続され、これに上流側の通電ロール3の対
地電位VC が掛かり、電流I1 が流れることになる。第
1のチョーク9によって被加熱材1に誘起される電圧は
リアクタンス17に掛かっている電圧と同じで、チョー
ク9の上流位置での被加熱材の対地電位はV1 となり、
完全にゼロにはならないことなど回路の原理は先の図2
の場合と同じである。先の例でいうと上流側の通電ロー
ル3の対地電位VC は5V、第1のチョーク9の上流位
置での被加熱材の対地電位はV1 は0.3V、巻線10
に流れる電流I1 は30Aといった値になる。この場合
において第2のチョーク11の上流側で被加熱材1が接
地されたとき、図4に示すように第2のチョークのリア
クタンス19を介して被加熱材の接地16と下流側の通
電ロールの接地15との間で電流I2 が流れる。このリ
アクタンス19は第1のチョークの巻線回路のインピー
ダンス18より容易に大きな値にできるので、接地回路
の電流I2 を巻線回路の電流I1 よりずっと小さな値に
できることになる。
FIG. 4 is a diagram showing an equivalent circuit of the device of FIG. 2, the reactance 17 of the first choke 9 and the impedance 18 of the line connected to the winding 10
Are connected in series, and the ground potential V C of the current-carrying roll 3 on the upstream side is applied to this, so that the current I 1 flows. The voltage induced in the material 1 to be heated by the first choke 9 is the same as the voltage applied to the reactance 17, and the ground potential of the material to be heated at the upstream position of the choke 9 is V 1 ,
The principle of the circuit, such as not being completely zero, is shown in FIG.
Is the same as In terms of the previous example ground potential V C of the conductive rolls 3 on the upstream side is 5V, ground potential V 1 of the material to be heated at an upstream position of the first choke 9 0.3V, winding 10
Current I 1 flowing in the a value such 30A. In this case, when the material to be heated 1 is grounded on the upstream side of the second choke 11, as shown in FIG. 4, the grounding 16 of the material to be heated and the current-carrying roll on the downstream side via the reactance 19 of the second choke. current I 2 flows between the ground 15 of the. This reactance 19 can to a large value more easily than the impedance 18 of the winding circuit of the first choke, becomes possible to current I 2 of the grounding circuit to the much smaller value than the current I 1 of the winding circuit.

【0024】図4の等価回路について先の例と同様に具
体的な数値をいうと、上流側の通電ロール3の対地電位
C が5Vの場合において、第1のチョーク9の上流位
置での被加熱材の対地電位V1 の0.3Vが第2のチョ
ークのリアクタンス19が負担すべき電圧ということに
なる。そしてこのときの第2のチョークの電流、すなわ
ち接地回路の電流I2 を先の例のように3Aとすると、
この電流は第1のチョークの電流I1 の30Aの10分
の1である。したがって第2のチョークの鉄心の断面積
は第1のチョークの(0.3V÷4.7V)×10=
0.6倍あれば良い。つまり第1と第2のチョークを加
えても、単一のチョークで同じように接地電流を制限す
る場合より小さい鉄心で済むことになる。しかも先の単
一のチョークの場合の例では接地回路のインピーダンス
とチョークの巻線に接続される線路のインピーダンスと
が同じで電流が1対1に分配されるとして計算したもの
で、接地回路のインピーダンスがこれより低ければ接地
回路の電流はさらに増える。一方図3の装置においては
接地回路のインピーダンスに影響されることなく同じよ
うに接地電流を制限できる。
Referring to the specific values of the equivalent circuit of FIG. 4 in the same manner as in the previous example, when the ground potential V C of the upstream energizing roll 3 is 5 V, the value at the upstream position of the first choke 9 0.3V of ground potential V 1 of the material to be heated is that the second choke reactance 19 voltage to be borne. Then, assuming that the current of the second choke, that is, the current I 2 of the ground circuit at this time is 3 A as in the above example,
This current is one tenth of 30 A of the current I1 of the first choke. Therefore, the sectional area of the iron core of the second choke is (0.3 V ÷ 4.7 V) × 10 =
0.6 times is sufficient. In other words, even if the first and second chokes are added, a smaller core is required when the ground current is similarly limited by a single choke. Moreover, in the above example of a single choke, the calculation was made on the assumption that the impedance of the ground circuit and the impedance of the line connected to the winding of the choke were the same and the current was distributed one-to-one. If the impedance is lower than this, the current of the ground circuit further increases. On the other hand, in the device of FIG. 3, the ground current can be similarly limited without being affected by the impedance of the ground circuit.

【0025】本発明に使用するチョークは透磁率が高い
ことが要求されるので鉄心の材料は方向性珪素鋼板を使
用するのがよい。線材や幅の狭い帯材の通電加熱に使用
するときにはトロイダルやレーストラックの形状の巻鉄
心が使用できるが、広幅の帯材用など大型のものは貫通
する被加熱材の走行方向に積層された積鉄心を使用すれ
ばよい。第1と第2のチョークを配置する場合、別個の
ものを隣接して配置して当然差し支えないが、積鉄心の
場合一体のものとして設置のスペースと手間の削減を図
ることができる。これは図5に示すように鉄心21の積
層厚さの一部分23に巻線22を設けて第1のチョーク
の部分とし、残りの積層厚さの部分24を第2のチョー
クの部分とすれば良い。なお図5において25は巻線2
2の端子部分であり、26は巻線を形成する銅板の厚み
の分だけ鉄心に隙間を開けるための鉄製などのスペーサ
である。
Since the choke used in the present invention is required to have a high magnetic permeability, it is preferable to use a grain-oriented silicon steel plate as the material of the iron core. When used for electrical heating of wires and narrow strips, wound cores in the form of toroids or race tracks can be used, but large ones such as wide strips are stacked in the running direction of the material to be penetrated. It is sufficient to use a stacked iron core. When arranging the first and second chokes, separate ones may be arranged adjacent to each other. However, in the case of a laminated iron core, the installation space and labor can be reduced as an integrated one. This can be achieved by providing a winding 22 on a portion 23 of the laminated thickness of the iron core 21 as a first choke portion as shown in FIG. 5 and a portion 24 of the remaining laminated thickness as a second choke portion. good. Note that in FIG.
Reference numeral 2 denotes a terminal portion, and reference numeral 26 denotes a spacer made of iron or the like for providing a gap in the iron core by the thickness of the copper plate forming the winding.

【0026】[0026]

【発明の効果】本発明の通電加熱装置によれば、加熱装
置の外部において被加熱材に電圧が現われるのを接地ロ
ールを用いることなしに簡易な設備で防止することがで
きる。また被加熱材が他の設備など通電加熱装置の外に
おいて接地されたとき、接地回路に流れる電流をきわめ
て小さな値に抑制できるのでベアリングの損傷などの事
故を防止できる。
According to the electric heating device of the present invention, it is possible to prevent a voltage from appearing on the material to be heated outside the heating device with simple equipment without using a grounding roll. Further, when the material to be heated is grounded outside the current-carrying heating device such as another facility, the current flowing through the grounding circuit can be suppressed to an extremely small value, so that accidents such as damage to bearings can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の通電加熱装置の例を示す図FIG. 1 is a diagram showing an example of an electric heating device according to the present invention.

【図2】図1の装置の等価回路を示す図FIG. 2 shows an equivalent circuit of the device of FIG.

【図3】本発明の通電加熱装置の例を示す図FIG. 3 is a diagram showing an example of an electric heating device according to the present invention.

【図4】図3の装置の等価回路を示す図4 shows an equivalent circuit of the device of FIG.

【図5】本発明に使用するチョークの例を示す図FIG. 5 is a diagram showing an example of a choke used in the present invention.

【図6】従来の外部電源方式の通電加熱装置を示す図FIG. 6 is a diagram showing a conventional energization heating device using an external power supply system.

【図7】従来のインライン変圧器方式の通電加熱装置を
示す図
FIG. 7 is a diagram showing a conventional in-line transformer type current-carrying heating apparatus;

【符号の説明】[Explanation of symbols]

1 被加熱材 2 変圧器 3、4 通電ロール 5 ブスバー 6 チョーク 7 巻線 8 接地 9 第1のチョーク 10 巻線 11 第2のチョーク 13 チョークのリアクタンス 14 巻線に接続される線路のインピーダンス 15 通電ロールの接地 16 被加熱材の接地 17 第1のチョークのリアクタンス 18 巻線に接続される線路のインピーダンス 19 第2のチョークのリアクタンス 21 鉄心 22 巻線 25 端子部分 26 スペーサ REFERENCE SIGNS LIST 1 heated material 2 transformer 3, 4 energizing roll 5 bus bar 6 choke 7 winding 8 ground 9 first choke 10 winding 11 second choke 13 choke reactance 14 impedance of line connected to winding 15 energization Grounding of roll 16 Grounding of material to be heated 17 Reactance of first choke 18 Impedance of line connected to winding 19 Reactance of second choke 21 Iron core 22 Winding 25 Terminal part 26 Spacer

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 連続的に走行する被加熱材を電源に接続
する巻線を設けた変圧器の鉄心に貫通させ、前記変圧器
の両側においてそれぞれ被加熱材に接触する通電ロール
を設けてその間を導電材で結線した直接通電加熱装置に
おいて、前記通電ロールのうちの一方の通電ロールを接
地するとともに、前記被加熱材が貫通する窓を有する鉄
心に巻回数1回の巻線が巻かれたチョークを他方の通電
ロールの前記変圧器と反対側に設け、前記巻線に流れる
電流によりチョークに発生した磁束によって被加熱材に
誘起される電圧が被加熱材の対地電位を相殺する極性に
巻線の両端を前記一方の通電ロールと他方の通電ロール
とに接続したことを特徴とする走行する被加熱材の直接
通電加熱装置。
1. A continuously running material to be heated is passed through an iron core of a transformer provided with a winding for connecting to a power source, and energizing rolls are provided on both sides of the transformer, respectively, in contact with the material to be heated. In the direct current heating device in which the conductive material is connected, one of the current-carrying rolls is grounded, and one turn is wound around an iron core having a window through which the material to be heated passes. A choke is provided on the other side of the current-carrying roll opposite to the transformer, and a voltage induced in the material to be heated by magnetic flux generated in the choke by a current flowing through the winding has a polarity that cancels a ground potential of the material to be heated. A direct current heating device for a running material to be heated, wherein both ends of a wire are connected to the one energizing roll and the other energizing roll.
【請求項2】 連続的に走行する被加熱材を電源に接続
する巻線を設けた変圧器の鉄心に貫通させ、前記変圧器
の両側においてそれぞれ被加熱材に接触する通電ロール
を設けてその間を導電材で結線した直接通電加熱装置に
おいて、前記通電ロールのうちの一方の通電ロールを接
地するとともに、前記被加熱材が貫通する窓を有する鉄
心に巻回数1回の巻線が巻かれた第1のチョークを他方
の通電ロールの前記変圧器と反対側に設け、前記巻線に
流れる電流によりチョークに発生した磁束によって被加
熱材に誘起される電圧が被加熱材の対地電位を相殺する
極性に巻線の両端を前記一方の通電ロールと他方の通電
ロールとに接続し、さらに前記被加熱材が貫通する窓を
有する鉄心よりなる第2のチョークを第1のチョークの
前記他方の通電ロールと反対側に設けたことを特徴とす
る走行する被加熱材の直接通電加熱装置。
2. A continuously running material to be heated is passed through an iron core of a transformer provided with a winding for connecting to a power source, and energizing rolls are provided on both sides of the transformer, respectively, in contact with the material to be heated. In the direct current heating device in which the conductive material is connected, one of the current-carrying rolls is grounded, and one turn is wound around an iron core having a window through which the material to be heated passes. A first choke is provided on the other side of the current-carrying roll opposite to the transformer, and a voltage induced in the material to be heated by magnetic flux generated in the choke due to a current flowing through the winding cancels a ground potential of the material to be heated. Both ends of the winding are connected to the one energizing roll and the other energizing roll in polarity, and a second choke made of an iron core having a window through which the material to be heated penetrates is connected to the other of the first choke by the other energizing. Low A direct current heating device for a running material to be heated, the heating device being provided on the opposite side of the heating device.
【請求項3】 第1のチョークと第2のチョークとは、
貫通する被加熱材の走行方向に積層された鉄心の積層厚
さの一部分に巻線を設けて第1のチョークの部分とし、
残りの積層厚さの部分を第2のチョークの部分とするこ
とにより、一体になったものであることを特徴とする請
求項2に記載の走行する被加熱材の直接通電加熱装置。
3. The first choke and the second choke,
A winding is provided on a part of the lamination thickness of the iron core laminated in the running direction of the material to be penetrated to form a first choke part,
3. The apparatus according to claim 2, wherein the remaining lamination thickness portion is formed as a second choke portion so as to be integrated.
JP20099297A 1997-07-11 1997-07-11 Direct current heating device for running material to be heated Expired - Lifetime JP3497352B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP20099297A JP3497352B2 (en) 1997-07-11 1997-07-11 Direct current heating device for running material to be heated

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP20099297A JP3497352B2 (en) 1997-07-11 1997-07-11 Direct current heating device for running material to be heated

Publications (2)

Publication Number Publication Date
JPH1129827A true JPH1129827A (en) 1999-02-02
JP3497352B2 JP3497352B2 (en) 2004-02-16

Family

ID=16433715

Family Applications (1)

Application Number Title Priority Date Filing Date
JP20099297A Expired - Lifetime JP3497352B2 (en) 1997-07-11 1997-07-11 Direct current heating device for running material to be heated

Country Status (1)

Country Link
JP (1) JP3497352B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006286248A (en) * 2005-03-31 2006-10-19 Toshiba Mitsubishi-Electric Industrial System Corp Induction heating device and arc spot suppression method therefor
JP2021068595A (en) * 2019-10-24 2021-04-30 株式会社豊田中央研究所 Induction heating device and induction heating method for rotating electric machine stator core

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006286248A (en) * 2005-03-31 2006-10-19 Toshiba Mitsubishi-Electric Industrial System Corp Induction heating device and arc spot suppression method therefor
JP2021068595A (en) * 2019-10-24 2021-04-30 株式会社豊田中央研究所 Induction heating device and induction heating method for rotating electric machine stator core

Also Published As

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