JP3936240B2

JP3936240B2 - Induction heating roller equipment

Info

Publication number: JP3936240B2
Application number: JP2002147117A
Authority: JP
Inventors: 徹外村
Original assignee: Tokuden Co Ltd Kyoto
Current assignee: Tokuden Co Ltd Kyoto
Priority date: 2002-05-22
Filing date: 2002-05-22
Publication date: 2007-06-27
Anticipated expiration: 2022-05-22
Also published as: JP2003338364A

Description

【０００１】
【発明の属する技術分野】
本発明は誘導発熱ローラ設備に関する。
【０００２】
【従来の技術】
回転する中空のローラの内部に、鉄心と、その外周に巻装された誘導コイルとからなる誘導発熱機構を配置し、これによってローラの周壁を誘導発熱させる誘導発熱ローラ装置は既に知られている。誘導コイルは単相電源で励磁するのが好ましいので、手近にある三相電源から単相電圧を取りだし、これを利用すればよく、具体的には三相電源の各線間に誘導発熱ローラ装置の各誘導コイルを接続して励磁することが考えられる。この場合容量が等しい３台の誘導コイルを、三相電源の各線路間にそれぞれ接続する配線構成とすれば、三相電源の相電流は平衡するので、特に問題はない。
【０００３】
しかしこの配線構成では、前記のように各相の線路間に、同容量の誘導コイルを３台接続すれば電源電流は平衡するとしても、誘導コイルが２台または１台であって、誘導コイルが接続されない線路間が存在するようなときは、三相電源電流は不平衡となり、三相電源構成に支障をきたすことは明らかである。
【０００４】
たとえば三相電源線路Ｕ，Ｖ，Ｗにおいて、線路ＵＶ間およびＶＷ間にそれぞれ１台の誘導コイルを接続したとする。両誘導コイルの容量が同じであるとし、各相の電源電流をＩすると、線路Ｕ，Ｖ，Ｗに流れる電流Ｉu，Ｉv，ＩwはそれぞれＩ，√（３）Ｉ，Ｉとなり、その比は、１：√（３）：１となる。また線路ＵＶ間のみに誘導コイルを接続し、線路ＶＷ間を無負荷とした場合は、電流ＩWは０となるので、各線路電流の比は、１：１：０となる。いずれも電流が不平衡となる傾向は大きい。
【０００５】
このように三相電源線路のＵ，Ｖ，Ｗにおいて、線路ＵＶ間およびＶＷ間または線路ＵＶ間のみに誘導コイルを接続した場合でも、各線路電流が平衡するように、あるいは不平衡傾向が少なくなるようにした構成は、本発明者によって既に提案されているところである。すなわちこれは三相電源の各線路にそれぞれ一端が接続され、他端が一括して接続されて中性点とされてあって、かつ同じ巻数の第１乃至第３の巻線からなり、第１の巻線にまたがって第１の誘導発熱ローラ装置に属している誘導コイルを接続し、第２の巻線および第３の巻線の、一括されている端部とは反対側の端部間にまたがって、第２の誘導発熱ローラ装置に属している誘導コイルを接続した構成である。しかしこの構成によれば、中性点とひとつの巻線の端部との間に誘導コイルを接続しているので、中性点の電位が移動するようなことがあると、誘導コイルの入力電圧が負荷電流によって変動してしまう。そのためこのようなことがあると、誘導発熱ローラの温度を安定して制御できなくなってしまう恐れがでてくる。
【０００６】
【発明が解決しようとする課題】
本発明は、三相電源から単相電圧を取りだして、これを２台または１台の誘導コイルの励磁電圧とすることにより、三相電源電流が可及的に平衡となるようにした構成において、３個の巻線を一括接続してある中性点の電位移動をなくして安定させるとともに、各巻線における高調波の発生の抑制を目的とする。
【０００７】
【課題を解決するための手段】
請求項１ないし請求項７に係る本発明は、三相電源の各線路にそれぞれ一端が接続されてある、同巻数の第１乃至第３の巻線と、一端が一括して中性点に接続されてあり、第１乃至第３の巻線と同相かつ同巻数である第４乃至第６の巻線とを備え、各第１乃至第３の巻線の各他端を、隣の相の前記各第４乃至第６の巻線の各他端に順次千鳥状に結線し、第１の巻線の一端と前記中性点と間にまたがって第１の誘導発熱ローラ装置に属している誘導コイルを接続し、第２の巻線と第３の巻線の各一端同志の間にまたがって、第２の誘導発熱ローラ装置に属している誘導コイルを接続した構成を基本構成として備える。
【０００８】
【発明の実施の形態】
本発明の実施の形態を図によって説明する。図１〜図５は、本発明の実施の形態における基本構成を説明する図で、本発明では複数の誘導発熱ローラ装置を二群に分け、そのうちの一方の第１の誘導発熱ローラ装置１に属している誘導コイルと、他方の第２の誘導発熱ローラ装置２に属している誘導コイルとにそれぞれ、三相電源線路から得た単相電圧を印加して励磁する構成である。各誘導発熱ローラ装置１，２はともに図１に示すように構成されている。
【０００９】
１１はローラシェル、１２はその両側に一体的に取り付けられているジャーナルで、軸受１３を介して機台１４に回転自在に支持されている。なお必要に応じてローラシェル１１の周壁の内部にジャケット室が設けられてあり、その内部に気液二相の熱媒体が減圧密封されている。１５は誘導発熱機構で、支持ロッド１６によって支持されている。支持ロッド１６はジャーナル２内に挿通され、軸受１７を介してジャーナル１２に支持されている。誘導発熱機構１５は、筒状の鉄心１８とその外周に巻装されている誘導コイル１９とによって構成されている。２０は誘導コイル１９のリード線で、支持ロッド１６の内部を通って外部に引き出されている。
【００１０】
本発明の実施の形態における基本構成では、図１および図２に示すように、巻数がそれぞれｎの巻線ａ1，ｂ1，ｃ1が用意される。各巻線ａ1，ｂ1，ｃ1の各一方の端部は三相電源線路の各線路Ｕ，Ｖ，Ｗにそれぞれ接続されている。また巻数が同じｎである巻線ａ2，ｂ2，ｃ2が用意される。各巻線ａ2，ｂ2，ｃ2の各一方の端部は一括して接続されている。この接続点を中性点Ｎとする。巻線ａ1，ａ2同志，巻線ｂ1，ｂ2同志，ならびに巻線ｃ1、ｃ2同志は共通の鉄心に重ね巻きされるなどして、同相の電圧が印加されるようにしてある。
【００１１】
巻線ａ1，ｂ1，ｃ1のそれぞれは、隣の相に属している巻線ａ2，ｂ2，ｃ2にそれぞれ直列に接続され、これにより千鳥状の結線とされる。巻線ａ1，ｂ1，ｃ1のうちの一つの巻線ａ1の一端と中性点Ｎとの間にまたがって、第１の誘導発熱ローラ装置１に属している誘導コイルＡ（図１の誘導発熱ローラ装置１の誘導コイル１９）を接続する。また他の二つの巻線ｂ1，ｃ1の各一端同志の間にまたがり、第２の誘導発熱ローラ装置２に属している誘導コイルＢ（図１の誘導発熱ローラ装置２の誘導コイル１９）をそれぞれ接続する。
【００１２】
次に図示する構成が三相電源に対して平衡する理由を説明する。三相電源の電圧をＥ、各巻線の巻数をｎ、各誘導発熱ローラ装置の誘導コイルＡ，Ｂは同容量とし、これに流れる電流をＩ1，Ｉ2とする。また各相電流をＩu、Ｉv，Ｉwとすると、誘導コイルＡの入力電圧はＥ／｛√(３)｝、誘導コイルＢの入力電圧はＥであるから、
｜Ｉ1｜＝｛√(３)｝×Ｉ2 （１式）
お本明細書では、電流、電圧の各値の上に表示するベクトルを意味するドットは省略してある。
【００１３】
電源に対して各相のインピーダンスは同じであるから、巻線ａ1，ｂ2を流れる電流、巻線ｂ1，ｃ2を流れる電流、巻線ｃ1，ａ2を流れる電流をそれぞれＩun，Ｉvn，Ｉwn，とすれば、
|Ｉun|＝|Ｉvn|＝|Ｉwn| （２式）
中性点Ｎにおいて、
Ｉun＋Ｉvn＋Ｉwn＝Ｉ1 （３式）
（１式）乃至（３式）から
|Ｉun|＝|Ｉvn|＝|Ｉwn|＝｜Ｉ1｜／３＝｜Ｉ2｜／｛√(３)｝（４式）
【００１４】
巻線ａ1の一端において
|Ｉu|＋｜Ｉ1｜／３＝｜Ｉ1｜（５式）
（５式）に（１式）を代入して整理すれば、

巻線ｂ1の一端において
|Ｉv|＝−｜Ｉ1｜／３＋｜Ｉ2｜（６式）
【００１５】
（４式）と（６式）から

巻線ｃ1の一端において

（４式）と（７式）とから

【００１６】
故に
|Ｉu|＝｜Ｉv｜＝｜Ｉw｜＝｜Ｉ2｜×２／｛√(３)｝
したがって、電源電流Ｉu，Ｉv，Ｉwは互いに等しくなり、平衡三相電流となる。そして各巻線は千鳥結線とされているので、高調波が発生することはないし、また中性点の電位の移動もなく安定する。図３は図２における各巻線のベクトル図を示す。なお各巻線は独立した３個の鉄心に巻回してもよいし、あるいは３脚鉄心の各脚に巻回してもよい。前者の場合の配線図を示したのが図４であり、後者の場合の配線図を示したのが図５である。
【００１７】
図６に示す第１の実施形態は、誘導コイルＡ，Ｂの入力電圧がともに電源電圧Ｅとなるようにしたものである。そのために巻線ｂ2に直列に、かつ重ね巻きされた巻線ｂ3を接続し、また巻線ｂ3に直列に、かつ巻線ａ1に重ね巻きされた巻線ａ3を接続する。他の巻線の巻数を図２と同様にｎとした場合、巻線ｂ3の巻数を｛√(３)−１｝×ｎとし、巻線ａ3の巻数を√(３)×ｎとする。なお巻数がｎである部分に印加される電圧はＥ／３となる。巻線ａ3の端部と中性点Ｎとにまたがって誘導コイルＡを接続する。
【００１８】
中性点Ｎから巻線ａ3の端部までの巻数は
ｎ＋｛√(３)−１｝×ｎ＋√(３)×ｎ＝２×√(３)×ｎであるから、誘導コイルＡに入力される電圧Ｖtは
Ｖt＝Ｅ×｛２×√(３)×ｎ｝×cos30°／３ｎ＝Ｅ
誘導コイルＢの入力電圧はＥであるから、したがって両誘導コイルＡ，Ｂの入力電圧は互いに同じ値となる。
【００１９】
このように両誘導コイルＡ，Ｂの入力電圧は互いに同じ値となることにより、
｜Ｉ1｜＝｜Ｉ2｜（８式）
両誘導コイルＡ，Ｂの容量を同じとすれば、
Ｉu＝２×Ｉ1／√（３）（９式）
となり、巻線ａ3，ｂ3に流れる電流はＩ1、巻線ａ1に流れる電流は
２×Ｉ1／√（３）となる。
【００２０】
巻線ｂ2に流れる電流をＩbとすれば、巻線ｂ2，ｂ3，ａ1の接続点において
Ｉ1−Ｉu−Ｉb＝０
上式に（９式）を代入して
Ｉ1−｛２×Ｉ1／√（３）｝−Ｉb＝０
よって
Ｉb＝〔１−｛２／√（３）｝〕×Ｉ1 （１０式）
【００２１】
中性点Ｎにおいて、
Ｉb＋Ｉvn＋Ｉwn＝Ｉ１（１１式）
１０式を１１式に代入すれば、

巻線ｂ1，ｃ2と、巻線ｃ1，ａ2のインピーダンスは同じであるから、
Ｉvn＝Ｉwn＝｛１／√（３）｝×Ｉ１
【００２２】
巻線ｂ1と誘導コイルＢとの接続点において、
Ｉv＝−〔｛１／√（３）｝×Ｉ１〕＋Ｉ2 （１２式）
上式と８式から

巻線ｃ1と誘導コイルＢとの接続点において、

上式と８式から

【００２３】
これらの結果から理解されるように、電源電流Ｉu，Ｉv，Ｉwは互いに等しくなり、平衡三相電流となる。高調波が発生しないこと、中性点の電位が安定することはさきの実施形態と同様である。なお各巻線は独立した３個の鉄心に巻回してもよいし、あるいは３脚鉄心の各脚に巻回してもよい。前者の場合の配線図を示したのが図７であり、後者の場合の配線図を示したのが図８である。
【００２４】
図９に示す第２の実施形態は、誘導コイルＡの入力電圧を任意に設定自在としたものである。この構成は、巻線ｂ2に延長して巻線ｂ4を設け、この巻線ｂ4に直列に、かつ巻線ａ1，ａ2と同相の巻線ａ4を接続してある。そして巻線ｂ2と巻線ｂ4との巻数の和をｎ1とする。巻線ｂ2の巻数を図２の場合と同様にｎとすれば、巻線ｂ4の巻数は（ｎ1−ｎ）となる。また巻線ａ4の巻数もｎ1とする。なお電源電圧をＥとすれば、巻数がｎである部分に印加される電圧はＥ／３となる。ここでは巻数ｎ1を任意に設定することにより、誘導コイルＡの入力電圧を自在に調整する。
【００２５】
各誘導コイルＡ，Ｂに流れる電流を、Ｉ1，Ｉ2とすれば、
|Ｉ2|＝ｎ1／｛√（３）×ｎ｝×|Ｉ１| （１４式）
誘導コイルＡ，Ｂの容量を図２の場合と同様に同容量とすれば、
Ｉu＝（２ｎ1／３ｎ）×Ｉ1 （１５式）
巻線ａ4，ｂ4に流れる電流はＩ1，巻線ａ1に流れる電流はＩuすなわち
（２ｎ1／３ｎ）×Ｉ1であるから、巻線ｂ2に流れる電流をＩbとすれば、巻線ｂ4，ａ1，ｂ2の接続点においては
Ｉ1−Ｉu−Ｉb＝０
【００２６】
上式に１５式を代入して電流Ｉbを求めると、
Ｉb＝｛１−（２ｎ1／３ｎ）｝×Ｉ1 （１６式）
中性点Ｎにおいて、
Ｉb＋Ｉvn＋Ｉwn＝Ｉ１（１７式）
上式に１７式に代入すれば、
Ｉvn＋Ｉwn＝（２ｎ1／３ｎ）×Ｉ1
巻線ｂ1，ｃ2と、巻線ｃ1，ａ2のインピーダンスは同じであるから、
Ｉvn＝Ｉwn＝(ｎ1／３ｎ)×Ｉ1 （１８式）
【００２７】
巻線ｂ1と誘導コイルＢとの接続点において、
Ｉv＝−｛（ｎ1／３ｎ）×Ｉ１｝＋Ｉ2 （１９式）
上式と１４式から

巻線ｃ1と誘導コイルＢとの接続点において、
Ｉw＝−（ｎ1／３n）×Ｉ１−Ｉ2 （２０式）
上式と１４式から

【００２８】
これらの結果から理解されるように、電源電流Ｉu，Ｉv，Ｉwは互いに等しくなり、平衡三相電流となる。高調波が発生しないこと、中性点の電位が安定することはさきの実施形態と同様である。なお各巻線は独立した３個の鉄心に巻回してもよいし、あるいは３脚鉄心の各脚に巻回してもよい。前者の場合の配線図を示したのが図１０であり、後者の場合の配線図を示したのが図１１である。図では巻線ｂ4を巻線ｂ2より延長して設けているが、これに代えて、巻線ｂ2の一部を利用してもよい。
【００２９】
図１２に示す第３の実施形態は、誘導コイルＢの入力電圧を任意に設定自在としたものである。この構成は、巻線ｃ2に延長して巻線ｃ3を設け、この巻線ｃ4に直列に、かつ巻線ｂ1，ｂ2と同相の巻線ｂ5を接続してある。そして巻線ｃ2と巻線ｃ5との巻数の和をｎ2とする。巻線ｃ2の巻数を図２の場合と同様にｎとすれば、巻線ｃ3の巻数は（ｎ2−ｎ）となる。また巻線ｂ5の巻数もｎ2とする。
【００３０】
さらに巻線ａ2に延長して巻線ａ5を設け、この巻線ａ5に直列に、かつ巻線ｃ2，ｃ3と同相の巻線ｃ5を接続してある。そして巻線ａ2と巻線ａ5との巻数の和をｎ2とする。巻線ａ2の巻数を図２の場合と同様にｎとすれば、巻線ａ5の巻数は（ｎ2−ｎ）となる。また巻線ｃ5の巻数もｎ2とする。ここでは巻数ｎ2を任意に設定することにより、誘導コイＢの入力電圧を自在に調整する。
【００３１】
ここでも各誘導コイルＡ，Ｂは同容量とし、それぞれに流れる電流をＩ1，Ｉ2とする。電流Ｉ1と電流Ｉ2の位相角差は９０度である。中性点Ｎから線路Ｕ，Ｖ，Ｗに至る各巻線のインピーダンスは等しいので、電流Ｉ1は中性点Ｎで３等分し、Ｉun＝Ｉvn＝Ｉwn （２１式）
巻線ａ1と誘導コイルＡとの接続点においては
Ｉu＝Ｉ1−Ｉun （２２式）
【００３２】
上式に２１式を代入して電流Ｉuを求めると、
Ｉu＝（２／３）×Ｉ1 （２３式）
巻線ｂ5，ｃ3，ｃ2，ａ2，ａ5，ｃ5に至る回路と、巻線ｂ1と巻線ｃ1とにおいて、
２ｎ×cos30°×（Ｉv−Ｉw）＝４×ｎ2×cos30°×Ｉ2
故に
Ｉv−Ｉw＝２×（ｎ2／ｎ）×Ｉ2 （２４式）
誘導コイルＡ，Ｂは同容量であるから、
|Ｉ2|＝ｎ／{√（３）×ｎ2}×|Ｉ1| （２５式）
【００３３】
中性点Ｎにおいて、
Ｉu＋Ｉv＋Ｉw＝０（２６式）
２４式と２６式とを加えると、
Ｉu＋２Ｉv＝２×（ｎ2／ｎ）×Ｉ2 （２７式）
上式と２３式から
２Ｉv＝２×（ｎ2／ｎ）×Ｉ2−（２／３）×Ｉ1
故に
Ｉv＝（ｎ2／ｎ）×Ｉ2−（１／３）×Ｉ1 （２８式）
２５式に２８式を代入して整理すれば、
|Ｉv|＝（２／３）×|Ｉ1|
次に２４式に２８式を代入して整理すれば、
Ｉw＝（−ｎ2／ｎ）×Ｉ2−（１／３）×Ｉ1 （２９式）
２５式と２９式から
|Ｉw|＝（２／３）×|Ｉ1|
【００３４】
これらの結果から理解されるように、電源電流Ｉu，Ｉv，Ｉwは互いに等しくなり、平衡三相電流となる。高調波が発生しないこと、中性点の電位が安定することはさきの実施形態と同様である。なお各巻線は独立した３個の鉄心に巻回してもよいし、あるいは三脚鉄心の各脚に巻回してもよい。前者の場合の配置図を示したのが図１３であり、後者の場合の配置図を示したのが図１４である。図では巻線ｃ3，ａ5を巻線ｃ2，ａ2より延長して設けているが、これに代えて、巻線ｃ2，ａ2の一部を利用してもよい。
【００３５】
図１５に示す第４の実施形態は、図９に示す第２の実施形態と、図１２に示す第３の実施形態とを合体させ、誘導コイルＡ，Ｂの入力電圧をともに独立して任意に設定自在としたものである。この構成は、図９および図１２と同様に、巻線ａ1，ａ2乃至巻線ｃ1,ｃ2の巻数をｎ、巻線ｂ4の巻数を（n1−ｎ）、巻線ｃ3、巻線ａ5の巻数を（n2−ｎ）、巻線ａ4の巻数をｎ1、巻線ｂ5および巻線ｃ5の巻数をｎ2とする。各巻線の位相関係は図９，図１２と同じである。巻数ｎ1およびｎ2を調整することによって、誘導コイルＡ，Ｂの入力電圧が調整される。
【００３６】
この構成においても、三相電流が平衡することを以下に説明する。２７式に１５式を代入して電流Ｉvを求めると、
Ｉv＝（ｎ2／ｎ）×Ｉ2−（ｎ1／３ｎ）×Ｉ1 （３０式）
上式と２５式からＩ2を消去してＩvの絶対値を求めると、
|Ｉv|＝（２／３）×（ｎ1／ｎ）×|Ｉ1|
２４式に３０式を代入して電流Ｉwを求めると、
Ｉw＝（−ｎ2／ｎ）×Ｉ2−（ｎ1／３ｎ）×Ｉ1 （３１式）
上式と２５式からＩ2を消去してＩwの絶対値を求めると、
|Ｉw|＝（２／３）×（ｎ1／ｎ）×|Ｉ1|
【００３７】
これらの結果から理解されるように、電源電流Ｉu，Ｉv，Ｉwは互いに等しくなり、平衡三相電流となる。高調波が発生しないこと、中性点の電位が安定することはさきの実施形態と同様である。なお各巻線は独立した３個の鉄心に巻回してもよいし、あるいは三脚鉄心の各脚に巻回してもよい。前者の場合の配置図を示したのが図１６であり、後者の場合の配置図を示したのが図１７である。図では巻線ｃ3，ａ5，ｂ4を巻線ｃ2，ａ2，ｂ2より延長して設けているが、これに代えて、巻線ｃ2，ａ2，ｂ2の一部を利用してもよいことは図９，図１４の場合と同様である。
【００３８】
以上の各実施態様は、いずれも誘導コイルＡ，Ｂをともに用いた構成であったが、これらの構成において誘導コイルＢに代えて、誘導コイルＢに匹敵する負荷として、リアクトルを接続するようにしてもよい。誘導コイルＡ，Ｂは同容量であるので、ここに使用するリアクトルは誘導コイルＡと同容量のものを用いる。このようなリアクトルを利用することにより、三相電源の各相電流が平衡することは、これまでの説明から容易に理解されるところである。
【００３９】
たとえば図１８に示す第５の実施形態では、第１の実施形態における誘導コイルＢに代えてリアクトルＬを、また図２１に示す第６の実施形態では、図１５に示す第４の実施形態における誘導コイルＢに代えて、リアクトルＬを接続している。他の実施形態においても同様である。
【００４０】
なお図１９，図２２は、図１８，図２１に示す構成を互いに独立した鉄心に、それぞれ同相の巻線を巻回して構成した配置図、図２０，図２３は図１８，図２１に示す構成を、三脚鉄心の各脚にそれぞれ同相の巻線を巻回して構成した配置図である。
【００４１】
以上述べたすべての実施形態における誘導コイルＢ（前記したリアクトルＬを含めて）を省略し、誘導コイルＡのみを負荷としてもよい。たとえば基本構成における誘導コイルＢを省略した図２４の構成（第７の実施形態）では、誘導コイルＡの入力電圧はＥ／√３となり、また三相電源に対して各相のインピーダンスは同じであるから、
|Ｉun|＝|Ｉvn|＝|Ｉwn|
中性点Ｎにおいて
Ｉun＋Ｉvn＋Ｉwn＝Ｉ1
上記両式から
|Ｉun|＝|Ｉvn|＝|Ｉwn|＝|Ｉ1|×１／３
【００４２】
巻線ａ1と誘導コイルＡとの接続点において、
|Ｉu|＋|Ｉ1|×１／３＝|Ｉ1|
したがって
|Ｉu|＝|Ｉ1|−|Ｉ1|×１／３＝|Ｉ1|×２／３
|Ｉv|＝|Ｉvn|＝|Ｉ1|×１／３
|Ｉw|＝|Ｉwn|＝|Ｉ1|×１／３
故に
|Ｉu|：|Ｉv|：|Ｉw|＝２：１：１
となる。
【００４３】
因みに三相交流電源の一つの線路間にのみ誘導コイルを接続した場合の三相電源電流の比は、冒頭に述べたように１：１：０となる。これに比較して図２４のように構成した場合のほうが、電源電流の不平衡を緩和することができる。なお図２５は、図２４に示す構成を、互いに独立した鉄心にそれぞれ同相の巻線を巻回して構成した配置図、図２６は図２４に示す構成を、三脚鉄心の各脚にそれぞれ同相の巻線を巻回して構成した配置図である。
【００４４】
また図９に示す第２の実施形態における誘導コイルＢを省略した図２７の構成（第８の実施形態）では、１９式，２０式における電流Ｉ1を０としたときの電流Ｉv，Ｉｗと１５式の電流Ｉuの各絶対値の比は、２：１：１となる。すなわち第８の実施形態と同じ電流比となり、三相電源電流の不平衡を緩和することができる。図２８は、図２７に示す構成を、互いに独立した鉄心に同相の巻線を巻回して構成した配置図、図２９は図２７に示す構成を、三脚鉄心の各脚にそれぞれ同相の巻線を巻回して構成した配置図である。
【００４５】
【発明の効果】
以上説明したように本発明によれば、三相電源から単相電圧を取り出して、誘導発熱ローラ装置の誘導コイルの励磁電圧とするにあたり、三相電源電流を平衡させることができ、または不平衡を緩和することができるとともに、高調波の発生は抑制され、かつ中性点の電位が安定するといった効果を奏する。
【図面の簡単な説明】
【図１】本発明の実施態様の基本構成を示す断面図である。
【図２】図１の結線図である。
【図３】図１のベクトル図である。
【図４】図１の配線図である。
【図５】図１の他の配線図である。
【図６】本発明の第１の実施態様を示す結線図である。
【図７】図６の配線図である。
【図８】図６の他の配線図である。
【図９】本発明の第２の実施態様を示す結線図である。
【図１０】図９の配線図である。
【図１１】図９の他の配線図である。
【図１２】本発明の第３の実施態様を示す結線図である。
【図１３】図１２の配線図である。
【図１４】図１２の他の配線図である。
【図１５】本発明の第４の実施態様を示す結線図である。
【図１６】図１５の配線図である。
【図１７】図１５の他の配線図である。
【図１８】本発明の第５の実施態様を示す結線図である。
【図１９】図１８の配線図である。
【図２０】図１８の他の配線図である。
【図２１】本発明の第６の実施態様を示す結線図である。
【図２２】図２１の配線図である。
【図２３】図２１の他の配線図である。
【図２４】本発明の第７の実施態様を示す結線図である。
【図２５】図２４の配線図である。
【図２６】図２４の他の配線図である。
【図２７】本発明の第８の実施態様を示す結線図である。
【図２８】図２７の配線図である。
【図２９】図２７の他の配線図である。
【符号の説明】
１，２誘導発熱ローラ装置
Ａ，Ｂ誘導コイル
ａ1〜ａ5 巻線
ｂ1〜ｂ5 巻線
ｃ1〜ｃ5 巻線
Ｌリアクトル[0001]
BACKGROUND OF THE INVENTION
The present invention relates to induction heating roller equipment.
[0002]
[Prior art]
There is already known an induction heating roller device in which an induction heating mechanism including an iron core and an induction coil wound around the outer periphery of a rotating hollow roller is arranged so that the peripheral wall of the roller is induced to generate heat. . Since the induction coil is preferably excited by a single-phase power supply, a single-phase voltage is taken from a nearby three-phase power supply, and this can be used. Specifically, the induction heating roller device is connected between each line of the three-phase power supply. It can be considered that each induction coil is connected and excited. In this case, if three induction coils having the same capacity are connected to each line of the three-phase power source, the phase current of the three-phase power source is balanced, so that there is no particular problem.
[0003]
However, in this wiring configuration, if three induction coils of the same capacity are connected between the lines of each phase as described above, the power supply current is balanced, but there are two or one induction coil. Obviously, when there is a line between which the two are not connected, the three-phase power supply current becomes unbalanced, which causes a problem in the three-phase power supply configuration.
[0004]
For example, in the three-phase power supply lines U, V, and W, one induction coil is connected between the lines UV and VW. Assuming that the capacity of both induction coils is the same and the power supply current of each phase is I, the currents Iu, Iv, Iw flowing in the lines U, V, W are I, √ (3) I, I, respectively, and the ratio is 1: √ (3): 1. Further, when an induction coil is connected only between the lines UV and no load is applied between the lines VW, the current IW is 0, so that the ratio of each line current is 1: 1: 0. In either case, the current tends to be unbalanced.
[0005]
As described above, in the U, V, and W of the three-phase power supply line, even when the induction coil is connected between the lines UV and VW or only between the lines UV, each line current is balanced or the tendency of unbalance is small. Such a configuration has already been proposed by the present inventors. That is, one end is connected to each line of the three-phase power source, the other end is collectively connected to be a neutral point, and is composed of first to third windings having the same number of turns. An induction coil belonging to the first induction heating roller device is connected across one winding, and ends of the second winding and the third winding on the side opposite to the bundled ends It is the structure which connected the induction coil which belongs to the 2nd induction heat-generating roller apparatus in between. However, according to this configuration, since the induction coil is connected between the neutral point and the end of one winding, if the potential of the neutral point moves, the input of the induction coil The voltage fluctuates depending on the load current. For this reason, there is a risk that the temperature of the induction heating roller cannot be stably controlled.
[0006]
[Problems to be solved by the invention]
In the present invention, a single-phase voltage is taken from a three-phase power source and used as an excitation voltage for two or one induction coil so that the three-phase power source current is balanced as much as possible. The purpose is to eliminate the potential shift at the neutral point where the three windings are connected at once, to stabilize the winding, and to suppress the generation of harmonics in each winding.
[0007]
[Means for Solving the Problems]
In the present invention according to claims 1 to 7, the first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end collectively to a neutral point And fourth to sixth windings having the same phase and the same number of turns as the first to third windings, and the other ends of the first to third windings are connected to the adjacent phases. Are connected to each other end of each of the fourth to sixth windings in a staggered manner, and belong to the first induction heating roller device across one end of the first winding and the neutral point. an induction coil are connected, provided across between each end comrades second winding and the third winding, the arrangement of connecting the induction coil belonging to the second induction heating roller apparatus as a basic structure .
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 5 are diagrams for explaining a basic configuration in an embodiment of the present invention . In the present invention, a plurality of induction heat roller devices are divided into two groups, and one of the first induction heat roller devices 1 is divided into two groups. In this configuration, a single-phase voltage obtained from a three-phase power supply line is applied to the induction coil belonging to the other induction coil belonging to the other second induction heating roller device 2 and excited. Each induction

heating roller device

1, 2 is configured as shown in FIG.
[0009]
11 is a roller shell, 12 is a journal integrally attached to both sides thereof, and is rotatably supported by a machine base 14 via a bearing 13. A jacket chamber is provided inside the peripheral wall of the roller shell 11 as necessary, and a gas-liquid two-phase heat medium is sealed under reduced pressure. An induction heating mechanism 15 is supported by a support rod 16. The support rod 16 is inserted into the journal 2 and supported by the journal 12 via a bearing 17. The induction heating mechanism 15 includes a cylindrical iron core 18 and an induction coil 19 wound around the outer periphery thereof. Reference numeral 20 denotes a lead wire of the induction coil 19 which is led out through the inside of the support rod 16.
[0010]
In the basic configuration of the embodiment of the present invention, as shown in FIGS. 1 and 2, windings a1, b1, and c1 each having n turns are prepared. One end of each winding a1, b1, c1 is connected to each line U, V, W of the three-phase power line. In addition, windings a2, b2, and c2 having the same number of turns n are prepared. One end of each of the windings a2, b2, c2 is connected together. This connection point is defined as a neutral point N. The windings a1 and a2, the windings b1 and b2, and the windings c1 and c2 are wound around a common iron core so that a common-phase voltage is applied.
[0011]
Each of the windings a1, b1, and c1 is connected in series to the windings a2, b2, and c2 belonging to the adjacent phases, thereby forming a staggered connection. An induction coil A belonging to the first induction heat roller device 1 (inductive heat generation in FIG. 1) spans between one end of one of the windings a1, b1, and c1 and the neutral point N. The induction coil 19) of the roller device 1 is connected. In addition, the induction coil B (the induction coil 19 of the induction heating roller device 2 in FIG. 1) that spans between the other ends of the other two windings b1 and c1 and belongs to the second induction heating roller device 2 respectively. Connecting.
[0012]
Next, the reason why the illustrated configuration is balanced with respect to the three-phase power source will be described. The voltage of the three-phase power supply is E, the number of turns of each winding is n, the induction coils A and B of each induction heating roller device have the same capacity, and the currents flowing through these coils are I1 and I2. If each phase current is Iu, Iv and Iw, the input voltage of the induction coil A is E / {√ (3)}, and the input voltage of the induction coil B is E.
| I1 | = {√ (3)} × I2 (1 set)
In the present specification, dots representing vectors displayed on the current and voltage values are omitted.
[0013]
Since the impedance of each phase with respect to the power supply is the same, the current flowing through the windings a1 and b2, the current flowing through the windings b1 and c2, and the current flowing through the windings c1 and a2 are respectively represented as Iun, Ivn, and Iwn. If
| Iun | = | Ivn | = | Iwn | (2 formulas)
At neutral point N,
Iun + Ivn + Iwn = I1 (3 formulas)
From (1 set) to (3 set)
| Iun | = | Ivn | = | Iwn | = | I1 | / 3 = | I2 | / {√ (3)} (Formula 4)
[0014]
At one end of winding a1
| Iu | + | I1 | / 3 = | I1 | (Formula 5)
Substituting (1) into (5) and rearranging

At one end of winding b1
| Iv | =-| I1 | / 3 + | I2 |
[0015]
From (Formula 4) and (Formula 6)

At one end of winding c1

From (Formula 4) and (Formula 7)

[0016]
Therefore
| Iu | = | Iv | = | Iw | = | I2 | × 2 / {√ (3)}
Accordingly, the power supply currents Iu, Iv, and Iw are equal to each other, and a balanced three-phase current is obtained. Since the windings are staggered, no harmonics are generated and the potential at the neutral point does not move and stabilizes. FIG. 3 shows a vector diagram of each winding in FIG. Each winding may be wound around three independent iron cores, or may be wound around each leg of a three-legged iron core. FIG. 4 shows a wiring diagram in the former case, and FIG. 5 shows a wiring diagram in the latter case.
[0017]
In the first embodiment shown in FIG. 6, the input voltages of the induction coils A and B are both set to the power supply voltage E. For this purpose, the winding b3 is connected in series with the winding b2, and the winding a3 wound in series with the winding b3 is connected to the winding b3. When the number of turns of the other winding is n as in FIG. 2, the number of turns of the winding b3 is {√ (3) -1} × n, and the number of turns of the winding a3 is √ (3) × n. The voltage applied to the portion with n turns is E / 3. The induction coil A is connected across the end of the winding a3 and the neutral point N.
[0018]
Since the number of turns from the neutral point N to the end of the winding a3 is n + {√ (3) -1} × n + √ (3) × n = 2 × √ (3) × n, input to the induction coil A The voltage Vt is Vt = E * {2 * √ (3) * n} * cos30 [deg.] / 3n = E
Since the input voltage of the induction coil B is E, therefore, the input voltages of both induction coils A and B have the same value.
[0019]
Thus, the input voltages of both induction coils A and B have the same value,
| I1 | = | I2 | (8 formulas)
If the capacity of both induction coils A and B is the same,
Iu = 2 × I1 / √ (3) (9 formulas)
Thus, the current flowing through the windings a3 and b3 is I1, and the current flowing through the winding a1 is 2 × I1 / √ (3).
[0020]
If the current flowing through the winding b2 is Ib, I1-Iu-Ib = 0 at the connection point of the windings b2, b3, a1.
Substituting (Equation 9) into the above equation, I1− {2 × I1 / √ (3)} − Ib = 0
Therefore, Ib = [1- {2 / √ (3)}] × I1 (10 equations)
[0021]
At neutral point N,
Ib + Ivn + Iwn = I1 (11 formulas)
Substituting equation 10 into equation 11,

Since the impedances of the windings b1 and c2 and the windings c1 and a2 are the same,
Ivn = Iwn = {1 / √ (3)} × I1
[0022]
At the connection point between the winding b1 and the induction coil B,
Iv =-[{1 / √ (3)} * I1] + I2 (12 formulas)
From the above formula and formula 8

At the connection point between the winding c1 and the induction coil B,

From the above formula and formula 8

[0023]
As can be understood from these results, the power supply currents Iu, Iv, and Iw are equal to each other, resulting in a balanced three-phase current. As in the previous embodiment, no harmonics are generated and the neutral point potential is stabilized. Each winding may be wound around three independent iron cores, or may be wound around each leg of a three-legged iron core. FIG. 7 shows a wiring diagram in the former case, and FIG. 8 shows a wiring diagram in the latter case.
[0024]
In the second embodiment shown in FIG. 9, the input voltage of the induction coil A can be arbitrarily set. In this configuration, a winding b4 is provided extending to the winding b2, and a winding a4 in phase with the windings a1 and a2 is connected in series with the winding b4. The sum of the number of turns of the winding b2 and the winding b4 is n1. If the number of turns of the winding b2 is n as in FIG. 2, the number of turns of the winding b4 is (n1-n). The number of turns of the winding a4 is also n1. If the power supply voltage is E, the voltage applied to the portion where the number of turns is n is E / 3. Here, the input voltage of the induction coil A is freely adjusted by arbitrarily setting the number of turns n1.
[0025]
If the currents flowing through the induction coils A and B are I1 and I2,
| I2 | = n1 / {√ (3) × n} × | I1 |
If the capacities of the induction coils A and B are the same as in the case of FIG.
Iu = (2n1 / 3n) × I1 (15 formulas)
Since the current flowing through the windings a4 and b4 is I1 and the current flowing through the winding a1 is Iu, that is, (2n1 / 3n) × I1, if the current flowing through the winding b2 is Ib, the windings b4, a1 and b2 I1-Iu-Ib = 0 at the connection point
[0026]
Substituting equation (15) into the above equation, the current Ib is obtained.
Ib = {1- (2n1 / 3n)} × I1 (16 formulas)
At neutral point N,
Ib + Ivn + Iwn = I1 (17 formulas)
Substituting 17 into the above equation,
Ivn + Iwn = (2n1 / 3n) × I1
Since the impedances of the windings b1 and c2 and the windings c1 and a2 are the same,
Ivn = Iwn = (n1 / 3n) × I1 (18 formulas)
[0027]
At the connection point between the winding b1 and the induction coil B,
Iv =-{(n1 / 3n) * I1} + I2 (Equation 19)
From above and 14

At the connection point between the winding c1 and the induction coil B,
Iw =-(n1 / 3n) * I1-I2 (20 formulas)
From above and 14

[0028]
As can be understood from these results, the power supply currents Iu, Iv, and Iw are equal to each other, resulting in a balanced three-phase current. As in the previous embodiment, no harmonics are generated and the neutral point potential is stabilized. Each winding may be wound around three independent iron cores, or may be wound around each leg of a three-legged iron core. FIG. 10 shows a wiring diagram in the former case, and FIG. 11 shows a wiring diagram in the latter case. In the figure, the winding b4 is extended from the winding b2, but a part of the winding b2 may be used instead.
[0029]
In the third embodiment shown in FIG. 12, the input voltage of the induction coil B can be arbitrarily set. In this configuration, a winding c3 is provided extending to the winding c2, and a winding b5 in phase with the windings b1 and b2 is connected in series with the winding c4. The sum of the number of turns of the winding c2 and the winding c5 is n2. If the number of turns of the winding c2 is n as in the case of FIG. 2, the number of turns of the winding c3 is (n2-n). The number of turns of the winding b5 is also n2.
[0030]
Further, a winding a5 is provided extending to the winding a2, and a winding c5 in phase with the windings c2 and c3 is connected in series with the winding a5. The sum of the number of turns of the windings a2 and a5 is n2. If the number of turns of the winding a2 is n as in the case of FIG. 2, the number of turns of the winding a5 is (n2-n). The number of turns of the winding c5 is also n2. Here, the input voltage of the induction carp B can be freely adjusted by arbitrarily setting the number of turns n2.
[0031]
Again, the induction coils A and B have the same capacity, and the currents flowing through them are I1 and I2, respectively. The phase angle difference between the current I1 and the current I2 is 90 degrees. Since the impedance of each winding from the neutral point N to the lines U, V, and W is equal, the current I1 is divided into three equal parts at the neutral point N, and Iun = Ivn = Iwn (Formula 21)
At the connection point between the winding a1 and the induction coil A, Iu = I1-Iun (Equation 22)
[0032]
Substituting equation (21) into the above equation, the current Iu is obtained.
Iu = (2/3) × I1 (23 formulas)
In the circuit extending to the windings b5, c3, c2, a2, a5, c5, and the windings b1 and c1,
2n × cos30 ° × (Iv−Iw) = 4 × n2 × cos30 ° × I2
Therefore, Iv-Iw = 2 * (n2 / n) * I2 (24 formulas)
Since induction coils A and B have the same capacity,
| I2 | = n / {√ (3) × n2} × | I1 | (Equation 25)
[0033]
At neutral point N,
Iu + Iv + Iw = 0 (Formula 26)
Adding formulas 24 and 26,
Iu + 2Iv = 2 × (n 2 / n) × I 2 (Equation 27)
From the above equation and equation 23, 2Iv = 2 × (n2 / n) × I2− (2/3) × I1
Therefore, Iv = (n2 / n) × I2− (1/3) × I1 (Equation 28)
Substituting 28 into 25 and rearranging,
| Iv | = (2/3) × | I1 |
Next, substituting 28 formulas into 24 formulates,
Iw = (-n2 / n) * I2- (1/3) * I1 (formula 29)
From formula 25 and formula 29
| Iw | = (2/3) × | I1 |
[0034]
As can be understood from these results, the power supply currents Iu, Iv, and Iw are equal to each other, resulting in a balanced three-phase current. As in the previous embodiment, no harmonics are generated and the neutral point potential is stabilized. Each winding may be wound around three independent iron cores, or may be wound around each leg of a tripod iron core. FIG. 13 shows the layout in the former case, and FIG. 14 shows the layout in the latter case. In the figure, the windings c3 and a5 are provided extending from the windings c2 and a2, but instead, a part of the windings c2 and a2 may be used.
[0035]
In the fourth embodiment shown in FIG. 15, the second embodiment shown in FIG. 9 and the third embodiment shown in FIG. 12 are combined, and the input voltages of the induction coils A and B are both arbitrarily determined. Can be set freely. In this configuration, as in FIGS. 9 and 12, the number of turns of the windings a1, a2 to c1, c2 is n, the number of turns of the winding b4 is (n1-n), the number of turns of the winding c3, and the winding a5. (N2−n), the number of turns of the winding a4 is n1, and the number of turns of the winding b5 and the winding c5 is n2. The phase relationship of each winding is the same as in FIGS. By adjusting the turns n1 and n2, the input voltages of the induction coils A and B are adjusted.
[0036]
It will be described below that the three-phase current is balanced even in this configuration. Substituting equation 15 into equation 27 to obtain current Iv,
Iv = (n2 / n) × I2− (n1 / 3n) × I1 (30 formulas)
When I2 is eliminated from the above equation and equation 25 and the absolute value of Iv is obtained,
| Iv | = (2/3) × (n1 / n) × | I1 |
Substituting equation 30 into equation 24 to obtain current Iw,
Iw = (-n2 / n) * I2- (n1 / 3n) * I1 (31 formulas)
If I2 is eliminated from the above equation and equation 25 and the absolute value of Iw is obtained,
| Iw | = (2/3) × (n1 / n) × | I1 |
[0037]
As can be understood from these results, the power supply currents Iu, Iv, and Iw are equal to each other, resulting in a balanced three-phase current. As in the previous embodiment, no harmonics are generated and the neutral point potential is stabilized. Each winding may be wound around three independent iron cores, or may be wound around each leg of a tripod iron core. FIG. 16 shows the layout in the former case, and FIG. 17 shows the layout in the latter case. In the figure, the windings c3, a5, and b4 are provided extending from the windings c2, a2, and b2. However, instead of this, a part of the windings c2, a2, and b2 may be used. 9. The same as in the case of FIG.
[0038]
In each of the above embodiments, the induction coils A and B are both used. However, instead of the induction coil B in these configurations, a reactor is connected as a load comparable to the induction coil B. May be. Since the induction coils A and B have the same capacity, the reactor used here has the same capacity as the induction coil A. It can be easily understood from the above description that the phase currents of the three-phase power supply are balanced by using such a reactor.
[0039]
For example, in the fifth embodiment shown in FIG. 18, a reactor L is used instead of the induction coil B in the first embodiment, and in the sixth embodiment shown in FIG. 21, in the fourth embodiment shown in FIG. Instead of the induction coil B, a reactor L is connected. The same applies to other embodiments.
[0040]
19 and 22 are layout diagrams in which the configurations shown in FIGS. 18 and 21 are formed by winding the same-phase windings around the independent iron cores, and FIGS. 20 and 23 are shown in FIGS. FIG. 3 is a layout diagram in which the same phase winding is wound around each leg of a tripod iron core.
[0041]
The induction coil B (including the reactor L described above) in all the embodiments described above may be omitted, and only the induction coil A may be used as a load. For example, in the configuration of FIG. 24 in which the induction coil B in the basic configuration is omitted ( seventh embodiment), the input voltage of the induction coil A is E / √3, and the impedance of each phase is the same as that of the three-phase power source. because there is,
| Iun | = | Ivn | = | Iwn |
At neutral point N Iun + Ivn + Iwn = I1
From both of the above formulas
| Iun | = | Ivn | = | Iwn | = | I1 | × 1/3
[0042]
At the connection point between winding a1 and induction coil A,
| Iu | + | I1 | × 1/3 = | I1 |
Therefore
| Iu | = | I1 |-| I1 | × 1/3 = | I1 | × 2/3
| Iv | = | Ivn | = | I1 | × 1/3
| Iw | = | Iwn | = | I1 | × 1/3
Therefore
| Iu |: | Iv |: | Iw | = 2: 1: 1
It becomes.
[0043]
Incidentally, the ratio of the three-phase power supply current when the induction coil is connected only between one line of the three-phase AC power supply is 1: 1: 0 as described at the beginning. Compared to this, the configuration shown in FIG. 24 can alleviate the unbalance of the power supply current. FIG. 25 is a layout diagram in which the configuration shown in FIG. 24 is configured by winding the same-phase windings around independent iron cores, and FIG. 26 shows the configuration shown in FIG. 24 in the same phase on each leg of the tripod core. It is the arrangement figure constituted by winding a winding.
[0044]
Further, in the configuration of FIG. 27 ( the eighth embodiment) in which the induction coil B in the second embodiment shown in FIG. 9 is omitted, currents Iv, Iw and 15 when the current I1 in

equations

19 and 20 is set to 0 are shown in FIG. The ratio of the absolute values of the current Iu in the equation is 2: 1: 1. That is, the current ratio is the same as in the eighth embodiment, and the unbalance of the three-phase power supply current can be alleviated. FIG. 28 is a layout diagram in which the configuration shown in FIG. 27 is formed by winding the same-phase windings around the independent iron cores, and FIG. 29 is the same-phase winding on each leg of the tripod iron core as shown in FIG. FIG.
[0045]
【The invention's effect】
As described above, according to the present invention, when the single-phase voltage is taken out from the three-phase power source and used as the excitation voltage of the induction coil of the induction heating roller device, the three-phase power source current can be balanced or unbalanced. Can be mitigated, the generation of harmonics is suppressed, and the neutral point potential is stabilized.
[Brief description of the drawings]
1 is a sectional view showing a basic structure of the actual embodiments with the present invention.
FIG. 2 is a connection diagram of FIG.
FIG. 3 is a vector diagram of FIG. 1;
4 is a wiring diagram of FIG. 1. FIG.
FIG. 5 is another wiring diagram of FIG. 1;
FIG. 6 is a connection diagram showing a first embodiment of the present invention.
7 is a wiring diagram of FIG. 6;
FIG. 8 is another wiring diagram of FIG. 6;
FIG. 9 is a connection diagram showing a second embodiment of the present invention.
10 is a wiring diagram of FIG. 9;
FIG. 11 is another wiring diagram of FIG. 9;
FIG. 12 is a connection diagram illustrating a third embodiment of the present invention.
13 is a wiring diagram of FIG.
FIG. 14 is another wiring diagram of FIG.
FIG. 15 is a connection diagram showing a fourth embodiment of the present invention.
16 is a wiring diagram of FIG.
FIG. 17 is another wiring diagram of FIG. 15;
FIG. 18 is a connection diagram showing a fifth embodiment of the present invention.
FIG. 19 is a wiring diagram of FIG. 18;
FIG. 20 is another wiring diagram of FIG.
FIG. 21 is a connection diagram showing a sixth embodiment of the present invention.
22 is a wiring diagram of FIG. 21. FIG.
23 is another wiring diagram of FIG. 21. FIG.
FIG. 24 is a connection diagram showing a seventh embodiment of the present invention.
25 is a wiring diagram of FIG. 24. FIG.
FIG. 26 is another wiring diagram of FIG. 24.
FIG. 27 is a connection diagram illustrating an eighth embodiment of the present invention.
28 is a wiring diagram of FIG. 27. FIG.
FIG. 29 is another wiring diagram of FIG. 27;
[Explanation of symbols]
1, 2 induction heating roller device A, B induction coil a1 to a5 winding b1 to b5 winding c1 to c5 winding L reactor

Claims

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. The other ends of the first winding are connected in a zigzag pattern and extended to the fourth winding, and the number of turns is {√ (3) -1} times the number of turns of the first winding. An eighth winding connected to the seventh winding and having the same phase as the first winding and having a number of turns √ (3) times the number of turns of the first winding; An induction coil belonging to the first induction heating roller device is connected across the end of the eighth winding and the neutral point, and the second winding and Straddling the end of the third winding Then, the induction coil belonging to the second induction heat roller device is connected, and the applied voltage of each induction coil belonging to the first and second induction heat roller devices is equal to the voltage of the three-phase power source. Induction heating roller equipment.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. Are connected to each other end in a staggered manner, and a ninth winding having an arbitrary number of turns is provided in the fourth winding or an extension winding thereof, and the ninth winding is further provided. A tenth winding having the same phase as the first winding and having the same number of turns as the ninth winding, and an end of the tenth winding and the middle The induction coil belonging to the first induction heating roller device is connected across the sex point, and the second coil and the third winding are connected between the ends of the second coil and the second coil. Invitation Heating roller device an induction coil connected belonging to the ninth have the number of turns of the winding, the first roller device arbitrarily set the induction heating roller equipment comprising an induction coil applied voltage belongs to.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. The other ends of the windings are sequentially connected in a staggered manner, and the eleventh and twelfth windings having the same number of turns are further provided in the fifth and sixth windings or in the extension windings thereof. Thirteenth and fourteenth windings connected to each of the eleventh and twelfth windings, having the same phase as the second and third windings and having the same number of turns, are provided. An induction coil belonging to the first induction heating roller device is connected across the end of the winding of the winding and the neutral point, and the thirteenth winding and the An induction coil belonging to the second induction heating roller device is connected across the ends of the 14 windings, and the number of turns of the 13th winding belongs to the second roller device. The induction heating roller equipment is configured by arbitrarily setting the induction coil applied voltage.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. Are connected to each other end in a staggered manner, and a ninth winding having an arbitrary number of turns is provided in the fourth winding or an extension winding thereof, and the ninth winding is further provided. A tenth winding having the same phase as the first winding and having the same number of turns as the ninth winding, and an end of the tenth winding and the middle The induction coil belonging to the first induction heating roller device is connected across the sex point, and the induction coil mark belonging to the first roller device is connected with the number of turns of the ninth winding. The voltage is arbitrarily set, and the eleventh and twelfth windings having the same number of turns are provided in the fifth and sixth windings or an extension winding thereof, and the eleventh and twelfth windings are further provided. Thirteenth and fourteenth windings connected to each of the windings and in phase with the second and third windings and having the same number of turns are provided, and the thirteenth winding and the first winding are provided. An induction coil belonging to the second induction heating roller device is connected across the ends of the 14 windings, and the number of turns of the 13th winding belongs to the second roller device. The induction heating roller equipment is configured by arbitrarily setting the induction coil applied voltage.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. The other end of each of the first winding is connected in a staggered manner, and an induction coil belonging to the induction heating roller device is connected across one end of the first winding and the neutral point, and the second An induction heating roller facility in which a reactor for balancing each phase current of the three-phase power source is connected between one end of each of the winding and the third winding.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. Are connected to the other ends of the windings in a staggered manner, and in the fourth winding or its extension winding, a ninth winding having an arbitrary number of turns is further connected to the ninth winding. A tenth winding connected and having the same phase as the first winding and having the same number of turns as the ninth winding, and the end of the tenth winding and the neutral Connecting the induction coil belonging to the induction heating roller device across the points, and arbitrarily applying the induction coil applied voltage belonging to the roller device with the number of turns of the ninth winding. And the eleventh and twelfth windings having the same number of turns in the fifth and sixth windings or their extension windings, and the eleventh and twelfth windings, respectively. The thirteenth and fourteenth windings having the same number of turns and the same phase as the second and third windings are provided, and the thirteenth winding and the fourteenth windings are provided. Induction heating roller equipment formed by connecting a reactor for balancing the phase currents of the three-phase power source across the ends.

The first to third windings having the same number of turns, each having one end connected to each line of the three-phase power source, and one end being collectively connected to the neutral point, the first to third windings 4th to 6th windings having the same phase and the same number of turns as the wire, and the other ends of the 1st to 3rd windings are connected to the 4th to 6th windings of the adjacent phase. Are connected to each other end in a staggered manner, and a ninth winding having an arbitrary number of turns is provided in the fourth winding or an extension winding thereof, and the ninth winding is further provided. A tenth winding having the same phase as the first winding and having the same number of turns as the ninth winding, and an end of the tenth winding and the middle The induction coil belonging to the induction heating roller device is connected across the sex point, and the induction coil applied voltage belonging to the roller device is arbitrarily determined by the number of turns of the ninth winding. Set, the induction heating roller equipment between the end comrades said second winding and the third winding becomes as unloaded.