JP4667664B2

JP4667664B2 - Power switchgear

Info

Publication number: JP4667664B2
Application number: JP2001212014A
Authority: JP
Inventors: 満月間; 行盛岸田; 健一小山; 敏惠竹内; 隆文中川
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2001-07-12
Filing date: 2001-07-12
Publication date: 2011-04-13
Anticipated expiration: 2021-07-12
Also published as: JP2003031087A

Description

【０００１】
【発明の属する技術分野】
この発明は、電磁力を利用して固定電極に対して可動電極を接離する電力用開閉装置に関するものである。
【０００２】
【従来の技術】
図１４は、電磁力を利用して固定電極５６に対して可動電極５５を接離する電力開閉装置の概略構成図であり、図１４（ａ）はその閉極状態、図１４（ｂ）はその開極状態を示す。
この電力用開閉装置は、接離自在な固定電極５６と可動電極５５とを有するスイッチ部５１と、可動電極５５に接続された可動軸５４の中間部に固定された可動部材である反発板５２と、この反発板５２の軸線方向で可動電極５５側に配置され反発板５２に電流を誘起させる開極用コイル５３ａと、反発板５２を介して開極用コイル５３ａと対向して配置され反発板５２に電流を誘起させる閉極用コイル５３ｂとを備えている。開極用コイル５３ａ及び閉極用コイル５３ｂは、図示しない磁界発生用電流源に接続されている。
【０００３】
可動電極５５及び固定電極５６にはそれぞれ電路に接続される端子５７、５７が接続されている。また、可動電極５５と反対側の可動軸５４の端部には、閉極時に可動電極５５と固定電極５６との間で接圧力を得るための皿バネ５８が設けられている。
【０００４】
次に、上記構成の電力用開閉装置の開極動作について説明する。
図１４（ａ）の閉極状態において、パルス電流を開極用コイル５３ａに流すと磁界が発生する。これによって開極用コイル５３ａが発生する磁界を打ち消す方向の磁界が発生するように反発板５２に誘導電流が発生する。開極用コイル５３ａが発生する磁界と反発板５２が発生する磁界の相互作用によって、反発板５２はコイル５３ａに対して電磁反発力を受ける。この電磁反発力によって、反発板５２に固着されている可動軸５４及び可動電極５５は反発方向に動作する。そして、図４のイで示すように、可動軸５４及び可動電極５５は、閉極位置から開極位置に移動する途中までは、皿バネ５８の弾性力に逆らって移動し、その後は皿バネ５の弾性力も反発板５２が受ける反発力と同じ方向に付勢して、スイッチ部５１は図１４（ｂ）に示す開極状態を得ることができる。その後、開極用コイル５３ａに流されるパルス電流は遮断され、その後は可動電極５５が皿バネ５８の弾性力で固定電極５６から離れた状態が保持される。
【０００５】
次に、電力用開閉装置の閉極動作について説明する。
図１４（ｂ）の開極状態において、パルス電流を閉極用コイル５３ｂにパルス電流を流すと磁界が発生する。これによって反発板５２に誘導電流が発生し、反発板５２は閉極用コイル５３ｂに対して電磁反発力を受ける。この電磁反発力によって、反発板５２に固着されている可動軸５４及び可動電極５５は反発方向に動作する。そして、図１４に示すように、可動軸５４及び可動電極５５は、閉極位置から開極位置に移動する途中までは、皿バネ５８の弾性力に逆らって移動し、その後は皿バネ５８の弾性力も反発板５２が受ける反発力と同じ方向に付勢して、スイッチ部５１は図１４（ａ）に示す開極状態を得ることができる。その後、閉極用コイル５３ｂに流されるパルス電流は遮断され、その後は固定電極５６に可動電極５５が皿バネ５８の弾性力で押圧された状態が保持される。
【０００６】
【発明が解決しようとする課題】
上記構成の電力用開閉装置では、固定電極５６および可動電極５５の開極状態、閉極状態を保持するのに皿バネ５８の弾性力を利用しているが、下記の問題点があった。
イ．開極動作時には、皿バネ５８の弾性力に逆らって可動軸５４を作動させなければならず、それだけ高速遮断が困難であり、また可動電極５５を固定電極５６から開離するのに大きなエネルギが必要となり、開極用コイル５３ａに流れる電流値が大きくならざるを得ない。また、同様に、閉極動作時にも、皿バネ５８の弾性力に逆らって可動軸５４を作動させなければならず、高速投入が困難であり、また可動電極５５を固定電極５６に当接するのに、大きなエネルギが必要となり、閉極用コイル５３ｂに流れる電流値が大きくならざるを得ない。
ロ．高電圧の開閉装置では、閉極状態を保持するために固定電極５６に対する可動電極５５の押圧力を大きくしなければならないが、そのために皿バネ５８の径方向の寸法を大きくしなければならない。
ハ．また、高電圧の開閉装置では、開極時において固定電極５６と可動電極５５との間のギャップを大きくしなければならないが、可動軸５４の長ギャップ駆動に耐え得る皿バネ５８の設計が困難である。
【０００７】
この発明は、上記のような問題点を解決することを課題とするものであって、高効率で、高速遮断および高速投入が可能で、かつ小型化できる電力用開閉装置を得ることを目的とする。
【０００８】
【課題を解決するための手段】
この発明に係る電力用開閉装置は、可動電極および固定電極を有するスイッチ部と、
一端部に前記可動電極が固定された可動軸と、
この可動軸に固定された可動部材、この可動部材を間に挟んで対向し可動軸に対して摺動自在の開極用コイルおよび閉極用コイルを有し、開極用コイルにパルス電流を通電することで開極用コイルと可動部材との間に作用する電磁反発力で前記固定電極から前記可動電極を開離させ、閉極用コイルにパルス電流を通電することで閉極用コイルと可動部材との間に作用する電磁反発力で前記固定電極に前記可動電極を当接させるようになっている駆動機構と、
前記可動軸が摺動自在に貫通したヨーク、このヨークの内側に設けられ前記可動軸の他端部に固定されたアマチュア、およびアマチュアと対向して前記ヨークの内側に固定された永久磁石を有し、この永久磁石、アマチュアおよびヨークの前記スイッチ部側の片側で構成された一方の磁気回路による磁気力でヨークの一方の側にアマチュアを吸着して閉極状態を保持し、また同永久磁石、アマチュアおよびヨークの反前記スイッチ部側の片側で構成された他方の磁気回路による磁気力でヨークの他方の側にアマチュアを吸着して開極状態を保持するようになっている磁気ラッチ機構とを備えている。
【０００９】
この発明に係る電力用開閉装置では、可動部材は、コイルである。
【００１０】
この発明に係る電力用開閉装置では、可動部材は、渦電流が生じる非磁性の導体板である。
【００１１】
この発明に係る電力用開閉装置では、ヨーク内の永久磁石は、駆動機構側に片寄って固定され、閉極状態における保持力が開極状態における保持力よりも大きくなるように、２つの磁気回路のパーミアンスが異なるようになっている。
【００１２】
この発明に係る電力用開閉装置は、ヨークは、断面コ字形状の第１のヨーク部と、この第１のヨーク部に距離をおいて対向した断面コ字形状の第２のヨーク部とから構成され、永久磁石は前記第１のヨークの開口端部に固定された第１の永久磁石部と、前記第２のヨークの開口端部に固定された第２の永久磁石部とから構成されている。
【００１３】
この発明に係る電力用開閉装置は、ヨーク、永久磁石およびアマチュアにより形成される二つの磁気回路の一方の内側に、一方の磁気回路に形成された磁束と同一方向に磁束を形成しヨークとアマチュアとの間の吸着力を増大させる吸着力増大コイルが設けられている。
【００１４】
この発明に係る電力用開閉装置は、ヨーク、永久磁石およびアマチュアにより形成される二つの磁気回路の他方の内側に、他方の磁気回路に形成された磁束と反対方向に磁束を形成しヨークとアマチュアとの間の吸着力を減少させる吸着力減少コイルが設けられている。
【００１５】
この発明に係る電力用開閉装置は、ヨークは、板状の第１のヨーク部と、この第１のヨークに距離をおいて対向した板状の第２のヨーク部とから構成され、永久磁石は、前記第１のヨーク部に固定された第１の永久磁石部と、前記第２のヨーク部に固定された第２の永久磁石部とから構成され、アマチュアは、前記第１の永久磁石部と前記第２の永久磁石部との間に設けられている。
【００１６】
この発明に係る電力用開閉装置は、アマチュアは、第１の永久磁石部を挟んで第１のヨーク部に対向した第１のアマチュア部と、第２の永久磁石部を挟んで第２のヨーク部に対向した第２のアマチュア部とから構成されている。
【００１７】
【発明の実施の形態】
以下、この発明の各実施の形態について図に基づいて説明するが、各実施の形態において、同一または同等部材、部位については、同一符号を付して説明する。
実施の形態１．
図１は、この発明の実施の形態１の電力用開閉装置の構成図であり、この電力用開閉装置は、可動電極１０ｂおよび固定電極１０ａを有するスイッチ部１００と、一端部に可動電極１０ｂが固定された可動軸１３と、可動軸１３の中間部に設けられ固定電極１０ａおよび可動電極１０ｂを接離する駆動機構１０１と、固定電極１０ａおよび可動電極１０ｂの開極状態、閉極状態を保持する磁気ラッチ機構１０２とを備えている。
【００１８】
上記スイッチ部１００は、可動電極１０ｂおよび固定電極１０ａを囲った真空容器１１と、真空容器１１内に設けられたベローズ１２とを備えている。
上記駆動機構１０１は、枠体２３に固定されているとともに可動軸１３に対して摺動自在の開極用コイル２１および閉極用コイル２２と、開極用コイル２１と閉極用コイル２２との間で可動軸１３に固定された可動部材である可動コイル２０とを備えている。
上記磁気ラッチ機構１０２は、可動軸１３が摺動自在に貫通した断面口の字形状のヨーク１と、ヨーク１の内側に設けられ可動軸１３の他端部に固定された直方体状のアマチュア２と、このアマチュア２の両側面にそれぞれ対向して設けられヨーク１の内側側面に固定された直方体状の永久磁石３とを備えている。
【００１９】
図２は、磁気ラッチ機構１０２の動作原理を説明するための説明図である。
図２では、可動軸１３に固定されたアマチュア２は、ヨーク１の上部１ａに当接している。このとき、永久磁石３の作る磁気回路は、Ｓ１およびＳ２である。しかし、磁気回路Ｓ２は、磁気回路Ｓ１と比較して空気ギャップ４が形成されるため、その磁気抵抗は大きくなり、パーミアンスは小さい。永久磁石３は両磁気回路で共通であるので、両磁気回路Ｓ１、Ｓ２を通過する磁束は、
【００２０】
（磁気回路Ｓ１を通過する磁束Φ１）＞（磁気回路Ｓ２を通過する磁束Φ２）
【００２１】
となる。従って、アマチュア２がヨーク１の上部１ａに吸引される力をＦ１、ヨーク１の下部１ｂに吸引される力をＦ２とすると、
【００２２】
Ｆ１＞Ｆ２
【００２３】
となるので、結果的にアマチュア２は上方に吸引されることになる。
【００２４】
次に、外部から強制的に、（Ｆ１―Ｆ２）よりも大きい力でアマチュア２を下方に移動させて、図３に示すような状態にしたとする。このとき、磁気回路Ｓ１は、磁気回路Ｓ２と比較して空気ギャップ４が形成されるため、磁気回路S２は磁気回路Ｓ１よりも磁気抵抗が小さく（パーミアンスが大きい）、先と同様の理論から、
【００２５】
Ｆ１＜Ｆ２
【００２６】
となり、アマチュア２はヨーク１の下部１ｂに吸引される。
【００２７】
図４のロは、アマチュア２に作用する磁気吸引力を、アマチュア２の位置に対してプロットしたものである。磁気吸引力は、磁気回路Ｓ１、Ｓ２の途中に空気ギャップ４が存在すると磁気抵抗の増大により急激に減衰するので、図４から分かるように、アマチュア２とヨーク１の上部１ａとの間、およびアマチュア２とヨーク１の下部１ｂとの間に空気ギャップ４が存在する、アマチュア２がヨーク１内の中間に位置するときは、Ｆ１、Ｆ２の力は小さく、両者間の力の差はほぼゼロに均しい。
【００２８】
図５は図１における開極用コイル２１、閉極用コイル２２、可動コイル２０とそれらにパルス電流を供給する電源とを電気的に接続した結線回路図である。
この結線回路では、開極用コイル２１に対してパルス電流を流す電源を構成する開極用電力貯蔵器６１ａと、閉極用コイル２２に対してパルス電流を流す電源を構成する閉極用電力貯蔵器６１ｂと、スイッチ部１００を開閉極時に可動コイル２０と、開極用コイル２１および閉極用コイル２２との間に磁界の相互作用を発生するように開極用電力貯蔵器６１ａ、閉極用電力貯蔵器６１ｂから各コイル２０、２１、２２に対するパルス電流の通電方向を設定する通電方向設定手段とを備えている。この通電方向設定手段は、開極用放電スイッチ６２ａ、閉極用放電スイッチ６２ｂ及びコイル間接続ダイオード６３ａ、６３ｂを備えている。
【００２９】
開極用コイル２１及び可動コイル２０はコイル間接続ダイオード６３ａを介して並列に接続され、開極用電力貯蔵器６１ａから開極用放電スイッチ６２ａを経てパルス電流が開極用コイル２１及び可動コイル２０に供給されるようになっている。また、閉極用コイル２２及び可動コイル２０もコイル間接続ダイオード６３ｂを介して並列に接続され、閉極用電力貯蔵器６１ｂから閉極用放電スイッチ６２ｂを経てパルス電流が閉極用コイル２２及び可動コイル２０に供給されるようになっている。コイル間接続ダイオード６３ａは開極用放電スイッチ６２ａと可動コイル２０との間に接続されている。コイル間接続ダイオード６３ｂは閉極用放電スイッチ６２ｂと可動コイル２０との間に接続されている。この例では開極用電力貯蔵器６１ａ、閉極用電力貯蔵器６１ｂはコンデンサであるが、電力を貯蔵する電池であってもよい。
【００３０】
なお、Ｄ１は開極用コイル２１に並列に接続され開極用コイル２１に蓄積された電磁エネルギを放出するダイオード、Ｄ２は可動コイル２０に並列に接続され可動コイル２０に蓄積された電磁エネルギを放出するダイオード、Ｄ３は閉極用コイル２２に並列に接続され閉極用コイル２２に蓄積された電磁エネルギを放出するダイオードである。
【００３１】
次に、上記構成の電力用開閉装置の動作について説明する。
先ず、電力用開閉装置の開極動作について説明する。図１の閉極状態では、永久磁石３の磁気力でアマチュア２はヨーク１の上部１ａに吸引しており、弾性部材１６は圧縮された状態で固定電極１０ａに可動電極１０ｂが一定の押圧力で接触している。
いま、開極用コイル２１および可動コイル２０に数secのパルス電流を通電することで、開極用コイル２１と可動コイル２０との間に、瞬時に反発力が発生する。
【００３２】
瞬間的な反発力によって固定電極１０ａから可動電極１０ｂが開離した後、アマチュア２がヨークの下部１ｂに接近すると、アマチュア２には、下方に永久磁石３による磁気吸引力が作用し、アマチュア２がヨークの下部１ｂに吸着して開閉装置の開状態は保持される。
【００３３】
図４のイに示すように、従来の皿バネの場合には開極動作の最初は、可動電極１０ｂが開離する方向と反対方向に大きな荷重Ｆが作用する。
それに対して、この実施の形態では、図４のロに示すように可動電極１０ｂが開離する方向と反対方向に作用する、アマチュア２とヨーク１の上部１ａとの間の磁気吸引力は、急激に減衰するため、開極動作は高速に行われる。従って、開極用コイル２１と可動コイル２０間との間で生じた小さな電磁反発力で大きな開極速度を得ることができ、効率的である。
【００３４】
次に、電力用開閉装置の閉極動作について説明する。開極状態では、永久磁石３の磁気力でアマチュア２はヨーク１の下部１ｂに吸引しており、固定電極１０ａから可動電極１０ｂが開離している。
いま、閉極用コイル２２および可動コイル２０に数secのパルス電流を通電することで、閉極用コイル２２と可動コイル２０との間に、瞬時に反発力が発生する。
瞬間的な反発力によってアマチュア２がヨーク１の下部１ｂから離れた後、アマチュア２がヨーク１の上部１ａに接近すると、アマチュア２には、上方向に永久磁石３による磁気吸引力が作用し、アマチュア２がヨーク１の上部１ａに吸着して開閉装置の閉状態は保持される。
【００３５】
実施の形態２．
図６はこの発明の実施の形態２の電力用開閉装置の構成図である。この実施の形態では、可動部材として可動コイル２０の代わりに、非磁性の導体板１２０を用いてもよい。
この場合には、開極用コイル２１から発生するパルス磁界により、導体板１２０に渦電流が発生し、この渦電流と開極用コイル２１に流れるコイル電流との反発力が駆動源となり、固定電極１０ａから可動電極１０ｂが開離し、電路は遮断される。
また、閉極用コイル２２から発生するパルス磁界により、導体板１２０に渦電流が発生し、この渦電流と閉極用コイル２２に流れるコイル電流との反発力が駆動源となり、固定電極１０ａに可動電極１０ｂが当接する。
【００３６】
実施の形態３．
図７はこの発明の実施の形態３の電力用開閉装置の磁気ラッチ機構１０２の説明図で、図１における永久磁石３の位置を駆動機構１０１側に片寄らせたものである。
このように構成することにより、２つの磁気回路Ｓ１と磁気回路Ｓ２の磁気抵抗が変わり、閉極状態におけるアマチュア２に作用する上向きの吸引力と、開極状態におけるアマチュア２に作用する下向きの吸引力とを比較したときに、閉極状態のときの吸引力の方を大きくすることができる。
電力用開閉装置では、一般に開極状態ではその状態が保持さえすればよいのに対して、閉極状態では、特に大電流が固定電極１０ａ、可動電極１０ｂに流れているときには接触圧力を大きくする必要がある。つまり、（閉極保持力）＞（開極保持力）にする必要がある。
従って、永久磁石３を駆動機構１０１側に片寄らせてヨーク１に固定するだけで、磁気ラッチ機構１０２の全体の大きさを変えないで、閉極時の接触圧力を大きくできる。
【００３７】
実施の形態４．
図８はこの発明の実施の形態４の電力用開閉装置の磁気ラッチ機構１０２の説明図で、ヨーク１、永久磁石３およびアマチュア２により形成される磁気回路Ｓ２の内側に、磁気回路Ｓ２に形成された磁束と同方向に磁束を形成する吸着力増大コイル５が配置されている。
開極用コイル２１に流れる電磁力パルスは、短時間で消失するため、アマチュア２の運動は、慣性的である。アマチュア２が開極動作時に途中まで移動した後、吸着力増大コイル５に電流を流して、アマチュア２のヨーク１の下部１ｂに対する吸引力を発生させることで、アマチュア２の速度を加速することができる。特に、アマチュア２の移動距離が長い場合に、アマチュア２、可動軸１３は、摺動摩擦力等の抗力により、駆動速度が低下する可能性があるので、開極時間の短縮化に有効である。
【００３８】
図９は実施の形態４の結線回路図であり、図５に示した結線回路に、吸着力増大コイル５に接続されたスイッチ６４ａが追加されている。吸着力増大コイル５への電流供給は、開極用放電スイッチ６２ａのＯＮと同期してスイッチ６４ａをＯＮとすることにより、電磁反発力と同期した駆動力をアマチュア２に発生させることができる。
【００３９】
実施の形態５．
図１０はこの発明の実施の形態５の電力用開閉装置の磁気ラッチ機構１０２の説明図で、ヨーク１、永久磁石３およびアマチュア２により形成される二つの磁気回路Ｓ１の内側にも、磁気回路に形成された磁束と反対方向に磁束を形成する吸着力低減コイル５Ａを追加した例である。
このように構成すれば、固定電極１０ａから可動電極１０ｂが開離するときに、永久磁石３によるアマチュア２のヨーク１の上部１ａに対する保持力が低減されるため、開極用コイル２１に通電する電流値は低減される。
なお、この場合の結線回路は、吸着力増大コイル５と吸着力低減コイル５Ａが並列に接続されている点を除いては、図９に示した結線回路と同じである。
【００４０】
実施の形態６．
図１１はこの発明の実施の形態６の電力用開閉装置の磁気ラッチ機構１０２の説明図で、ヨーク１は、断面コ字形状の第１のヨーク部１Ａと、この第１のヨーク部１Ａに距離をおいて対向した断面コ字形状の第２のヨーク部１Ｂとから構成されている。また、永久磁石は第１のヨーク部１Ａの開口端部に固定された第１の永久磁石部３ａと、第２のヨーク部１Ｂの開口端部に固定された第２の永久磁石部３ｂとから構成されている。
このような構成により、磁気回路Ｓ１と磁気回路Ｓ２とは二つに分離しており、それぞれの磁気回路の抵抗を小さくすることができる。
【００４１】
実施の形態７．
図１２はこの発明の実施の形態７の電力用開閉装置の磁気ラッチ機構１０２の説明図で、ヨークは、板状の第１のヨーク部１Ａと、この第１のヨーク１Ａに距離をおいて対向した板状の第２のヨーク部１Ｂとから構成されている。永久磁石は、第１のヨーク部１Ａに固定された第１の永久磁石部３ａと、第２のヨーク部１Ｂに固定された第２の永久磁石部３ｂとから構成されている。
このような構成により、ヨーク１Ａ、１Ｂの形状が単純化され、加工が容易で、制作コストが低減される。
【００４２】
実施の形態８．
図１３はこの発明の実施の形態８の電力用開閉装置の磁気ラッチ機構１０２の説明図で、アマチュアは、第１の永久磁石部３ａを挟んで第１のヨーク部１Ａに対向した第１のアマチュア部２ａと、第２の永久磁石部３ｂを挟んで第２のヨーク部１Ｂに対向した第２のアマチュア部２ｂとから構成されている。
このように、アマチュアを二つに分割することで、アマチュアの重量を軽くすることができ、小さなコイル電流で、高速駆動を実施することができる。
【００４３】
なお、上記の各実施の形態では、可動コイル２０に電流を流すことで、開極用コイル２１、閉極用コイル２２との間に反発力を生じさせたが、可動コイルに電流を流すことで、開極用コイル、閉極用コイルとの間に吸引力を生じさせるようにしてもよい。
【００４４】
【発明の効果】
以上説明したように、この発明の電力用開閉装置によれば、可動電極および固定電極を有するスイッチ部と、一端部に前記可動電極が固定された可動軸と、この可動軸に固定された可動部材、この可動部材を間に挟んで対向し可動軸に対して摺動自在の開極用コイルおよび閉極用コイルを有し、開極用コイルにパルス電流を通電することで開極用コイルと可動部材との間に作用する電磁反発力で前記固定電極から前記可動電極を開離させ、閉極用コイルにパルス電流を通電することで閉極用コイルと可動部材との間に作用する電磁反発力で前記固定電極に前記可動電極を当接させるようになっている駆動機構と、前記可動軸が摺動自在に貫通したヨーク、このヨークの内側に設けられ前記可動軸の他端部に固定されたアマチュア、およびアマチュアと対向して前記ヨークの内側に固定された永久磁石を有し、この永久磁石、アマチュアおよびヨークの前記スイッチ部側の片側で構成された一方の磁気回路による磁気力でヨークの一方の側にアマチュアを吸着して閉極状態を保持し、また同永久磁石、アマチュアおよびヨークの反前記スイッチ部側の片側で構成された他方の磁気回路による磁気力でヨークの他方の側にアマチュアを吸着して開極状態を保持するようになっている磁気ラッチ機構とを備えているので、小さなコイル電流値で開極動作および閉極動作を高速で行うことができる。
【００４５】
また、この発明に係る電力用開閉装置によれば、可動部材は、コイルであるので、コイルに電流を流すことで、開極用コイル、閉極用コイルとの間に簡単に反発力、吸引力を得ることができる。
【００４６】
また、この発明に係る電力用開閉装置によれば、可動部材は、渦電流が生じる非磁性の導体板であるので、簡単な構成で可動部材を得ることができ、製作コストが低減される。
【００４７】
また、この発明に係る電力用開閉装置によれば、ヨーク内の永久磁石は、駆動機構側に片寄って固定され、閉極状態における保持力が開極状態における保持力よりも大きくなるように、２つの磁気回路のパーミアンスが異なるようになっているので、磁気ラッチ機構の全体の大きさを変えることなく、閉極時の固定電極に対する可動電極の接触圧力を大きく設定することができる。
【００４８】
また、この発明に係る電力用開閉装置によれば、ヨークは、断面コ字形状の第１のヨーク部と、この第１のヨーク部に距離をおいて対向した断面コ字形状の第２のヨーク部とから構成され、永久磁石は前記第１のヨークの開口端部に固定された第１の永久磁石部と、前記第２のヨークの開口端部に固定された第２の永久磁石部とから構成されているので、二つの磁気回路の抵抗を小さくすることができ、永久磁石の電磁力保持効率が向上する。
【００４９】
また、この発明に係る電力用開閉装置によれば、ヨーク、永久磁石およびアマチュアにより形成される二つの磁気回路の一方の内側に、一方の磁気回路に形成された磁束と同一方向に磁束を形成しヨークとアマチュアとの間の吸着力を増大させる吸着力増大コイルが設けられているので、アマチュアの移動途中で速度を加速させることができ、アマチュアの移動距離が長い場合に、アマチュア、可動軸は、摺動摩擦力等の抗力により、駆動速度が低下する可能性が高いが、その場合に特に駆動時間の短縮化に有効である。
【００５０】
また、この発明に係る電力用開閉装置よれば、ヨーク、永久磁石およびアマチュアにより形成される二つの磁気回路の他方の内側に、他方の磁気回路に形成された磁束と反対方向に磁束を形成しヨークとアマチュアとの間の吸着力を減少させる吸着力減少コイルが設けられているので、永久磁石によるアマチュアのヨークに対する保持力が低減でき、開極用コイルに通電する電流値を低減することができる。
【００５１】
また、この発明に係る電力用開閉装置によれば、ヨークは、板状の第１のヨーク部と、この第１のヨークに距離をおいて対向した板状の第２のヨーク部とから構成され、永久磁石は、前記第１のヨーク部に固定された第１の永久磁石部と、前記第２のヨーク部に固定された第２の永久磁石部とから構成され、アマチュアは、前記第１の永久磁石部と前記第２の永久磁石部との間に設けられているので、ヨークの形状が単純化され、加工が容易で、制作コストが低減される。
【００５２】
また、この発明に係る電力用開閉装置によれば、アマチュアは、第１の永久磁石部を挟んで第１のヨーク部に対向した第１のアマチュア部と、第２の永久磁石部を挟んで第２のヨーク部に対向した第２のアマチュア部とから構成されているので、アマチュアの重量を軽くすることができ、小さなコイル電流で、高速駆動を実施することができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１の電力用開閉装置の構成図である。
【図２】図１の磁気ラッチ機構の閉極状態での原理説明図である。
【図３】図１の磁気ラッチ機構の開極状態での原理説明図である。
【図４】アマチュアと、アマチュアに作用する保持力との関係図である。
【図５】実施の形態１の駆動機構の電気結線図である。
【図６】この発明の実施の形態２の電力用開閉装置の構成図である。
【図７】この発明の実施の形態３の電力用開閉装置の磁気ラッチ機構の構成図である。
【図８】この発明の実施の形態４の電力用開閉装置の磁気ラッチ機構の構成図である。
【図９】実施の形態４の駆動機構の電気結線図である。
【図１０】この発明の実施の形態５の電力用開閉装置の磁気ラッチ機構の構成図である。
【図１１】この発明の実施の形態６の電力用開閉装置の磁気ラッチ機構の構成図である。
【図１２】この発明の実施の形態７の電力用開閉装置の磁気ラッチ機構の構成図である。
【図１３】この発明の実施の形態８の電力用開閉装置の磁気ラッチ機構の構成図である。
【図１４】従来の電力用開閉装置の構成図で、図１４（ａ）は閉極状態の図、図１４（ｂ）は開極状態の図である。
【符号の説明】
１ヨーク、１Ａ第１のヨーク部、１Ｂ第２のヨーク部、２アマチュア、２ａ第１のアマチュア部、２ｂ第２のアマチュア部、３永久磁石、３ａ第１の永久磁石部、３ｂ第２の永久磁石部、５吸着力増大コイル、５Ａ吸着力低減コイル、１０a 固定電極、１０ｂ可動電極、１３可動軸、２０可動コイル、２１開極用コイル、２２閉極用コイル、１００スイッチ部、１０１駆動機構、１０２磁気ラッチ機構、１２０導体板。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power switchgear that uses an electromagnetic force to move a movable electrode toward and away from a fixed electrode.
[0002]
[Prior art]
FIG. 14 is a schematic configuration diagram of a power switching device that contacts and separates the movable electrode 55 with respect to the fixed electrode 56 using electromagnetic force. FIG. 14A is a closed state, and FIG. The open state is shown.
This power switchgear includes a switch unit 51 having a fixed electrode 56 and a movable electrode 55 that can be contacted and separated, and a repulsion plate 52 that is a movable member fixed to an intermediate portion of a movable shaft 54 connected to the movable electrode 55. And an opening coil 53a that is arranged on the movable electrode 55 side in the axial direction of the repulsion plate 52 and induces a current in the repulsion plate 52, and is opposed to the opening coil 53a via the repulsion plate 52. A closing coil 53b for inducing current in the plate 52 is provided. The opening coil 53a and the closing coil 53b are connected to a magnetic field generating current source (not shown).
[0003]
Terminals 57 and 57 connected to the electric circuit are connected to the movable electrode 55 and the fixed electrode 56, respectively. A disc spring 58 is provided at the end of the movable shaft 54 opposite to the movable electrode 55 for obtaining a contact pressure between the movable electrode 55 and the fixed electrode 56 when the pole is closed.
[0004]
Next, the opening operation of the power switchgear having the above configuration will be described.
In the closed state of FIG. 14A, a magnetic field is generated when a pulse current is passed through the opening coil 53a. As a result, an induced current is generated in the repulsion plate 52 so that a magnetic field is generated in a direction that cancels the magnetic field generated by the opening coil 53a. Due to the interaction between the magnetic field generated by the opening coil 53a and the magnetic field generated by the repulsion plate 52, the repulsion plate 52 receives an electromagnetic repulsive force on the coil 53a. Due to this electromagnetic repulsive force, the movable shaft 54 and the movable electrode 55 fixed to the repulsion plate 52 operate in the repulsion direction. 4, the movable shaft 54 and the movable electrode 55 are moved against the elastic force of the disc spring 58 until moving from the closed position to the open position, and thereafter the disc spring. The elastic force 5 is also urged in the same direction as the repulsive force received by the repulsive plate 52, so that the switch portion 51 can obtain the open state shown in FIG. Thereafter, the pulse current flowing through the opening coil 53a is interrupted, and thereafter, the movable electrode 55 is kept away from the fixed electrode 56 by the elastic force of the disc spring 58.
[0005]
Next, the closing operation of the power switch will be described.
In the open state of FIG. 14B, a magnetic field is generated when a pulse current is passed through the closing coil 53b. As a result, an induced current is generated in the repulsion plate 52, and the repulsion plate 52 receives an electromagnetic repulsive force on the closing coil 53b. Due to this electromagnetic repulsive force, the movable shaft 54 and the movable electrode 55 fixed to the repulsion plate 52 operate in the repulsion direction. And figure 14 As shown in FIG. 2, the movable shaft 54 and the movable electrode 55 move against the elastic force of the disc spring 58 until moving from the closed position to the open position, and thereafter, the elastic force of the disc spring 58 is also repelled. By energizing in the same direction as the repulsive force received by the switch 52, the switch unit 51 can obtain the open state shown in FIG. Thereafter, the pulse current flowing through the closing coil 53b is interrupted, and thereafter, the state where the movable electrode 55 is pressed against the fixed electrode 56 by the elastic force of the disc spring 58 is maintained.
[0006]
[Problems to be solved by the invention]
In the power switchgear having the above-described configuration, the elastic force of the disc spring 58 is used to maintain the open and closed states of the fixed electrode 56 and the movable electrode 55. However, there are the following problems.
I. During the opening operation, the movable shaft 54 must be operated against the elastic force of the disc spring 58, and thus it is difficult to cut off at high speed, and a large amount of energy is required to separate the movable electrode 55 from the fixed electrode 56. The current value flowing through the opening coil 53a is inevitably increased. Similarly, even during the closing operation, the movable shaft 54 must be operated against the elastic force of the disc spring 58, so that it is difficult to perform high-speed input, and the movable electrode 55 is brought into contact with the fixed electrode 56. In addition, a large amount of energy is required, and the value of the current flowing through the closing coil 53b must be large.
B. In the high-voltage switchgear, the pressing force of the movable electrode 55 against the fixed electrode 56 must be increased in order to maintain the closed state, and for this purpose, the radial dimension of the disc spring 58 must be increased.
C. Further, in the high-voltage switchgear, the gap between the fixed electrode 56 and the movable electrode 55 must be increased at the time of opening, but it is difficult to design the disc spring 58 that can withstand the long gap driving of the movable shaft 54. It is.
[0007]
An object of the present invention is to provide a power switchgear that is capable of solving the above-described problems and that is highly efficient, capable of high-speed shut-off and high-speed input, and that can be downsized. To do.
[0008]
[Means for Solving the Problems]
A power switchgear according to the present invention includes a switch unit having a movable electrode and a fixed electrode;
A movable shaft having the movable electrode fixed to one end thereof;
A movable member fixed to this movable shaft, this movable Element Between the opening coil and the movable member by passing a pulse current through the opening coil. Electromagnetic acting between Repulsion The fixed electrode with force From The movable electrode Separation Electromagnetic force acting between the closing coil and the movable member by applying a pulse current to the closing coil Repulsion The fixed electrode with force In The movable electrode Contact A drive mechanism adapted to cause
There is provided a yoke through which the movable shaft slidably passes, an arm provided inside the yoke and fixed to the other end of the movable shaft, and a permanent magnet fixed to the inside of the yoke so as to face the armature. And This permanent magnet, armature and yoke are composed of one side on the switch part side The armature is attracted to one side of the yoke by the magnetic force of one magnetic circuit, and the closed state is maintained. The permanent magnet, armature, and yoke are composed of one side on the opposite side of the switch part. A magnetic latch mechanism configured to hold an open state by attracting an armature to the other side of the yoke by the magnetic force of the other magnetic circuit.
[0009]
In the power switchgear according to the present invention, the movable member is a coil.
[0010]
In the power switchgear according to the present invention, the movable member is a nonmagnetic conductor plate in which an eddy current is generated.
[0011]
In the power switchgear according to the present invention, the permanent magnet in the yoke is fixed to the drive mechanism side so that the holding force in the closed state is larger than the holding force in the open state. The permeance is different.
[0012]
In the power switchgear according to the present invention, the yoke includes a first yoke portion having a U-shaped cross section and a second yoke portion having a U-shaped cross section facing the first yoke portion at a distance. The permanent magnet includes a first permanent magnet portion fixed to the opening end portion of the first yoke, and a second permanent magnet portion fixed to the opening end portion of the second yoke. ing.
[0013]
A power switchgear according to the present invention forms a magnetic flux in the same direction as the magnetic flux formed in one magnetic circuit inside one of two magnetic circuits formed by a yoke, a permanent magnet, and an armature. An adsorption force increasing coil for increasing the adsorption force between the two is provided.
[0014]
The power switchgear according to the present invention forms a magnetic flux in the opposite direction to the magnetic flux formed in the other magnetic circuit inside the other of the two magnetic circuits formed by the yoke, the permanent magnet, and the armature. An adsorption force reducing coil for reducing the adsorption force between the two is provided.
[0015]
In the power switchgear according to the present invention, the yoke includes a plate-shaped first yoke portion and a plate-shaped second yoke portion facing the first yoke at a distance from each other, and a permanent magnet. Is composed of a first permanent magnet portion fixed to the first yoke portion and a second permanent magnet portion fixed to the second yoke portion, and an amateur is the first permanent magnet portion. Part and the second permanent magnet part.
[0016]
In the power switchgear according to the present invention, the amateur has a first armature portion facing the first yoke portion with the first permanent magnet portion interposed therebetween, and a second yoke sandwiching the second permanent magnet portion. And a second amateur part facing the part.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each embodiment of the present invention will be described with reference to the drawings. In each embodiment, the same or equivalent members and parts will be described with the same reference numerals.
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a power switchgear according to Embodiment 1 of the present invention. This power switchgear includes a switch unit 100 having a movable electrode 10b and a fixed electrode 10a, and a movable electrode 10b at one end. A fixed movable shaft 13, a drive mechanism 101 provided at an intermediate portion of the movable shaft 13 that contacts and separates the fixed electrode 10 a and the movable electrode 10 b, and the fixed electrode 10 a and Movable electrode 10b And a magnetic latch mechanism 102 for holding the open state and the closed state.
[0018]
The switch unit 100 includes a vacuum vessel 11 surrounding the movable electrode 10b and the fixed electrode 10a, and a bellows 12 provided in the vacuum vessel 11.
The driving mechanism 101 is fixed to the frame body 23 and is slidable with respect to the movable shaft 13. The driving coil 101 and the closing coil 22, and the opening coil 21 and the closing coil 22. And a movable coil 20 which is a movable member fixed to the movable shaft 13.
The magnetic latch mechanism 102 includes a yoke 1 having a cross-sectional shape in which a movable shaft 13 is slidably penetrated, and a rectangular parallelepiped armature 2 provided inside the yoke 1 and fixed to the other end of the movable shaft 13. And a rectangular parallelepiped permanent magnet 3 provided opposite to both side surfaces of the armature 2 and fixed to the inner side surface of the yoke 1.
[0019]
FIG. 2 is an explanatory diagram for explaining the operating principle of the magnetic latch mechanism 102.
In FIG. 2, the armature 2 fixed to the movable shaft 13 is in contact with the upper portion 1 a of the yoke 1. At this time, the magnetic circuit made by the permanent magnet 3 is S1 and S2. However, since the air gap 4 is formed in the magnetic circuit S2 compared to the magnetic circuit S1, the magnetic resistance is increased and the permeance is small. Since the permanent magnet 3 is common to both magnetic circuits, the magnetic flux passing through both magnetic circuits S1, S2 is
[0020]
(Magnetic flux Φ1 passing through magnetic circuit S1)> (Flux Φ2 passing through magnetic circuit S2)
[0021]
It becomes. Therefore, if the force that the armature 2 is attracted to the upper portion 1a of the yoke 1 is F1, and the force that is attracted to the lower portion 1b of the yoke 1 is F2,
[0022]
F1> F2
[0023]
As a result, the amateur 2 is sucked upward.
[0024]
Next, it is assumed that the armature 2 is forcibly moved from the outside by a force larger than (F1-F2) to be in a state as shown in FIG. At this time, since the air gap 4 is formed in the magnetic circuit S1 compared to the magnetic circuit S2, the magnetic circuit S2 has a smaller magnetic resistance (larger permeance) than the magnetic circuit S1, and from the same theory as above,
[0025]
F1 <F2
[0026]
Thus, the armature 2 is attracted to the lower portion 1b of the yoke 1.
[0027]
In FIG. 4B, the magnetic attractive force acting on the amateur 2 is plotted with respect to the position of the amateur 2. Magnetic attraction force is in the middle of the magnetic circuit S1, S2. Air gap 4 4 is abruptly attenuated due to an increase in magnetic resistance, and as can be seen from FIG. 4, between the armature 2 and the upper portion 1a of the yoke 1, and between the armature 2 and the lower portion 1b of the yoke 1. Air gap 4 When the armature 2 is located in the middle of the yoke 1, the forces of F1 and F2 are small, and the difference in force between them is almost zero.
[0028]
FIG. 5 is a connection circuit diagram in which the opening coil 21, the closing coil 22, and the movable coil 20 in FIG. 1 are electrically connected to a power source for supplying a pulse current thereto.
In this connection circuit, the opening power storage 61a that constitutes a power source for supplying a pulse current to the opening coil 21 and the closing power that constitutes a power source for supplying a pulse current to the closing coil 22 are provided. The opening power storage 61a and the closing circuit 61b and the switching unit 100 are closed so as to generate a magnetic field interaction between the movable coil 20, the opening coil 21, and the closing coil 22 when the switch unit 100 is opened and closed. And an energization direction setting means for setting the energization direction of the pulse current from the pole power storage 61b to the coils 20, 21, and 22. This energization direction setting means includes an opening discharge switch 62a, a closing discharge switch 62b, and inter-coil connection diodes 63a and 63b.
[0029]
The opening coil 21 and the movable coil 20 are connected in parallel via an inter-coil connection diode 63a, and a pulse current is transmitted from the opening power storage 61a via the opening discharge switch 62a to the opening coil 21 and the movable coil. 20 is supplied. The closing coil 22 and the movable coil 20 are also connected in parallel via the inter-coil connecting diode 63b, and the pulse current is passed from the closing power storage 61b via the closing discharge switch 62b to the closing coil 22 and The movable coil 20 is supplied. The inter-coil connecting diode 63a is connected between the opening discharge switch 62a and the movable coil 20. The inter-coil connecting diode 63 b is connected between the closing discharge switch 62 b and the movable coil 20. In this example, the opening power storage 61a and the closing power storage 61b are capacitors, but may be batteries that store power.
[0030]
D1 is a diode that is connected in parallel to the opening coil 21 and emits electromagnetic energy accumulated in the opening coil 21, and D2 is an electromagnetic energy that is connected in parallel to the movable coil 20 and accumulated in the movable coil 20. A diode D3 is a diode that is connected in parallel to the closing coil 22 and emits electromagnetic energy accumulated in the closing coil 22.
[0031]
Next, the operation of the power switchgear having the above configuration will be described.
First, the opening operation of the power switch will be described. In the closed state of FIG. 1, the armature 2 is attracted to the upper part 1a of the yoke 1 by the magnetic force of the permanent magnet 3, and the elastic member 16 is compressed and the movable electrode 10b is pressed against the fixed electrode 10a with a constant pressing force. In contact.
Now, by applying a pulse current of several seconds to the opening coil 21 and the movable coil 20, a repulsive force is instantaneously generated between the opening coil 21 and the movable coil 20.
[0032]
After the movable electrode 10b is separated from the fixed electrode 10a by an instantaneous repulsive force, when the armature 2 approaches the lower part 1b of the yoke, a magnetic attraction force by the permanent magnet 3 acts on the armature 2 downward. Is attracted to the lower portion 1b of the yoke, and the open state of the switchgear is maintained.
[0033]
As shown in FIG. 4A, in the case of the conventional disc spring, at the beginning of the opening operation, a large load F acts in a direction opposite to the direction in which the movable electrode 10b is separated.
On the other hand, in this embodiment, the magnetic attraction force between the armature 2 and the upper portion 1a of the yoke 1 acting in the direction opposite to the direction in which the movable electrode 10b separates as shown in FIG. Because of the rapid decay, the opening operation is performed at high speed. Therefore, a large opening speed can be obtained with a small electromagnetic repulsive force generated between the opening coil 21 and the movable coil 20, which is efficient.
[0034]
Next, the closing operation of the power switch will be described. In the open state, the armature 2 is attracted to the lower part 1b of the yoke 1 by the magnetic force of the permanent magnet 3, and the movable electrode 10b is separated from the fixed electrode 10a.
Now, by applying a pulse current of several seconds to the closing coil 22 and the movable coil 20, a repulsive force is instantaneously generated between the closing coil 22 and the movable coil 20.
After the armature 2 moves away from the lower portion 1b of the yoke 1 by an instantaneous repulsive force, when the armature 2 approaches the upper portion 1a of the yoke 1, a magnetic attraction force by the permanent magnet 3 acts on the armature 2 upward. The amateur 2 is attracted to the upper portion 1a of the yoke 1, and the closed state of the switchgear is maintained.
[0035]
Embodiment 2. FIG.
6 is a block diagram of a power switchgear according to Embodiment 2 of the present invention. In this embodiment, a nonmagnetic conductor plate 120 may be used as the movable member instead of the movable coil 20.
In this case, an eddy current is generated in the conductor plate 120 by the pulse magnetic field generated from the opening coil 21, and the repulsive force between the eddy current and the coil current flowing in the opening coil 21 serves as a driving source and is fixed. The movable electrode 10b is separated from the electrode 10a, and the electric circuit is interrupted.
Further, an eddy current is generated in the conductor plate 120 by the pulse magnetic field generated from the closing coil 22, and the repulsive force between the eddy current and the coil current flowing in the closing coil 22 serves as a driving source, and the fixed electrode 10a The movable electrode 10b contacts.
[0036]
Embodiment 3 FIG.
FIG. 7 is an explanatory view of the magnetic latch mechanism 102 of the power switch according to the third embodiment of the present invention, in which the position of the permanent magnet 3 in FIG. 1 is shifted toward the drive mechanism 101 side.
With this configuration, the magnetic resistances of the two magnetic circuits S1 and S2 change, and the upward attractive force acting on the amateur 2 in the closed state and the downward attractive force acting on the amateur 2 in the opened state. When the force is compared, the attractive force in the closed state can be increased.
In the power switchgear, it is generally only necessary to maintain the state in the open state, whereas in the closed state, the contact pressure is increased particularly when a large current flows through the fixed electrode 10a and the movable electrode 10b. There is a need. That is, it is necessary to satisfy (closed contact holding force)> (open contact holding force).
Accordingly, the contact pressure at the time of closing can be increased without changing the overall size of the magnetic latch mechanism 102 simply by shifting the permanent magnet 3 toward the drive mechanism 101 and fixing it to the yoke 1.
[0037]
Embodiment 4 FIG.
FIG. 8 is an explanatory diagram of the magnetic latch mechanism 102 of the power switchgear according to Embodiment 4 of the present invention. The magnetic latch mechanism 102 is formed inside the magnetic circuit S2 formed by the yoke 1, the permanent magnet 3, and the armature 2. An attractive force increasing coil 5 that forms a magnetic flux in the same direction as the generated magnetic flux is disposed.
Since the electromagnetic force pulse flowing in the opening coil 21 disappears in a short time, the movement of the amateur 2 is inertial. After the amateur 2 has moved halfway during the opening operation, the speed of the amateur 2 can be accelerated by causing a current to flow through the attraction force increasing coil 5 and generating an attractive force to the lower portion 1b of the yoke 1 of the armature 2. it can. In particular, when the moving distance of the amateur 2 is long, the driving speed of the armature 2 and the movable shaft 13 may decrease due to a drag such as a sliding frictional force, which is effective in shortening the opening time.
[0038]
FIG. 9 is a connection circuit diagram according to the fourth embodiment. A switch 64a connected to the attractive force increasing coil 5 is added to the connection circuit shown in FIG. Current supply to the attractive force increasing coil 5 can cause the armature 2 to generate a driving force synchronized with the electromagnetic repulsive force by turning on the switch 64a in synchronization with the opening of the opening discharge switch 62a.
[0039]
Embodiment 5. FIG.
FIG. 10 is an explanatory diagram of the magnetic latch mechanism 102 of the power switchgear according to the fifth embodiment of the present invention. The magnetic circuit is also formed inside the two magnetic circuits S1 formed by the yoke 1, the permanent magnet 3 and the armature 2. This is an example in which an attraction force reducing coil 5 </ b> A that forms a magnetic flux in the opposite direction to the magnetic flux formed on is added.
With this configuration, when the movable electrode 10b is separated from the fixed electrode 10a, the holding force of the permanent magnet 3 to the upper portion 1a of the yoke 1 is reduced, so that the opening coil 21 is energized. The current value is reduced.
The connection circuit in this case is the same as the connection circuit shown in FIG. 9 except that the suction force increasing coil 5 and the suction force reducing coil 5A are connected in parallel.
[0040]
Embodiment 6 FIG.
FIG. 11 is an explanatory diagram of the magnetic latch mechanism 102 of the power switchgear according to Embodiment 6 of the present invention. The yoke 1 includes a first yoke portion 1A having a U-shaped cross section, and the first yoke portion 1A. It is composed of a second yoke portion 1B having a U-shaped cross-section facing each other at a distance. The permanent magnet is the first Yoke part 1A A first permanent magnet portion 3a fixed to the opening end of the second Yoke part 1B And a second permanent magnet portion 3b fixed to the opening end of the first permanent magnet.
With such a configuration, the magnetic circuit S1 and the magnetic circuit S2 are separated into two, and the resistance of each magnetic circuit can be reduced.
[0041]
Embodiment 7 FIG.
FIG. 12 is an explanatory view of the magnetic latch mechanism 102 of the power switchgear according to Embodiment 7 of the present invention. The yoke is spaced apart from the plate-like first yoke portion 1A and the first yoke 1A. It is composed of a plate-like second yoke portion 1B facing each other. The permanent magnet is composed of a first permanent magnet part 3a fixed to the first yoke part 1A and a second permanent magnet part 3b fixed to the second yoke part 1B.
With such a configuration, the shapes of the yokes 1A and 1B are simplified, processing is easy, and production costs are reduced.
[0042]
Embodiment 8 FIG.
FIG. 13 is an explanatory view of the magnetic latch mechanism 102 of the power switchgear according to Embodiment 8 of the present invention, in which the amateur has a first yoke 1A facing the first yoke part 1A across the first permanent magnet part 3a. An amateur portion 2a and a second amateur portion 2b opposed to the second yoke portion 1B with the second permanent magnet portion 3b interposed therebetween.
Thus, by dividing the amateur into two, the weight of the amateur can be reduced, and high-speed driving can be performed with a small coil current.
[0043]
In each of the above embodiments, a repulsive force is generated between the opening coil 21 and the closing coil 22 by flowing a current through the movable coil 20, but a current is flowed through the movable coil. Thus, an attractive force may be generated between the opening coil and the closing coil.
[0044]
【The invention's effect】
As described above, according to the power switchgear of the present invention, the switch portion having the movable electrode and the fixed electrode, the movable shaft having the movable electrode fixed to one end, and the movable shaft fixed to the movable shaft. Member, this movable Element Between the opening coil and the movable member by passing a pulse current through the opening coil. Electromagnetic acting between Repulsion The fixed electrode with force From The movable electrode Separation Electromagnetic force acting between the closing coil and the movable member by applying a pulse current to the closing coil Repulsion The fixed electrode with force In The movable electrode Contact A drive mechanism adapted to be moved, a yoke through which the movable shaft slidably passes, an armature provided inside the yoke and fixed to the other end of the movable shaft, and the yoke facing the armature A permanent magnet fixed inside, This permanent magnet, armature and yoke are composed of one side on the switch part side The armature is attracted to one side of the yoke by the magnetic force of one magnetic circuit, and the closed state is maintained. The permanent magnet, armature, and yoke are composed of one side on the opposite side of the switch part. It has a magnetic latch mechanism that holds the open state by attracting the armature to the other side of the yoke by the magnetic force of the other magnetic circuit, so that the opening operation and closing can be performed with a small coil current value. Polar operation can be performed at high speed.
[0045]
According to the power switchgear according to the present invention, since the movable member is a coil, a repulsive force and a suction can be easily generated between the opening coil and the closing coil by passing a current through the coil. You can gain power.
[0046]
Further, according to the power switchgear according to the present invention, since the movable member is a non-magnetic conductor plate in which eddy current is generated, the movable member can be obtained with a simple configuration, and the manufacturing cost is reduced.
[0047]
Further, according to the power switchgear according to the present invention, the permanent magnet in the yoke is offset toward the drive mechanism side so that the holding force in the closed state is larger than the holding force in the open state. Since the permeances of the two magnetic circuits are different, the contact pressure of the movable electrode with respect to the fixed electrode at the time of closing can be set large without changing the overall size of the magnetic latch mechanism.
[0048]
According to the power switchgear according to the present invention, the yoke includes a first yoke portion having a U-shaped cross section and a second U shape having a U-shaped cross section facing the first yoke portion at a distance. The permanent magnet includes a first permanent magnet portion fixed to the opening end portion of the first yoke, and a second permanent magnet portion fixed to the opening end portion of the second yoke. Therefore, the resistance of the two magnetic circuits can be reduced, and the electromagnetic force retention efficiency of the permanent magnet is improved.
[0049]
Further, according to the power switchgear according to the present invention, the magnetic flux is formed in the same direction as the magnetic flux formed in one magnetic circuit inside one of the two magnetic circuits formed by the yoke, the permanent magnet and the armature. Since an attractive force increasing coil that increases the attractive force between the yoke and the amateur is provided, the speed can be accelerated during the movement of the amateur, and if the distance of the amateur is long, the armature and the movable shaft Is likely to decrease the driving speed due to a drag such as a sliding frictional force. In this case, the driving time is particularly effective.
[0050]
Further, according to the power switchgear according to the present invention, the magnetic flux is formed inside the other of the two magnetic circuits formed by the yoke, the permanent magnet and the armature in the opposite direction to the magnetic flux formed in the other magnetic circuit. Since the attraction force reducing coil for reducing the attraction force between the yoke and the armature is provided, the holding force of the permanent magnet to the armature yoke can be reduced, and the current value supplied to the opening coil can be reduced. it can.
[0051]
According to the power switchgear according to the present invention, the yoke is composed of a plate-shaped first yoke portion and a plate-shaped second yoke portion facing the first yoke at a distance. The permanent magnet is composed of a first permanent magnet portion fixed to the first yoke portion and a second permanent magnet portion fixed to the second yoke portion. Since it is provided between the first permanent magnet portion and the second permanent magnet portion, the shape of the yoke is simplified, the processing is easy, and the production cost is reduced.
[0052]
Further, according to the power switchgear according to the present invention, the amateur sandwiches the first permanent magnet portion, the first amateur portion facing the first yoke portion, and the second permanent magnet portion. Since the second armature portion is opposed to the second yoke portion, the weight of the armature can be reduced, and high-speed driving can be performed with a small coil current.
[Brief description of the drawings]
1 is a configuration diagram of a power switchgear according to Embodiment 1 of the present invention;
FIG. 2 is an explanatory diagram of the principle of the magnetic latch mechanism of FIG. 1 in a closed state.
FIG. 3 is a diagram illustrating the principle of the magnetic latch mechanism of FIG. 1 in an open state.
FIG. 4 is a relationship diagram between an amateur and a holding force acting on an amateur.
FIG. 5 is an electrical connection diagram of the drive mechanism according to the first embodiment.
FIG. 6 is a configuration diagram of a power switchgear according to Embodiment 2 of the present invention.
FIG. 7 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 3 of the present invention.
FIG. 8 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 4 of the present invention.
FIG. 9 is an electrical connection diagram of the drive mechanism of the fourth embodiment.
FIG. 10 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 5 of the present invention.
FIG. 11 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 6 of the present invention.
FIG. 12 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 7 of the present invention;
FIG. 13 is a configuration diagram of a magnetic latch mechanism of a power switchgear according to Embodiment 8 of the present invention.
14A and 14B are configuration diagrams of a conventional power switchgear, in which FIG. 14A is a diagram showing a closed state, and FIG. 14B is a diagram showing a opened state.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Yoke, 1A 1st yoke part, 1B 2nd yoke part, 2 amateur, 2a 1st amateur part, 2b 2nd amateur part, 3 permanent magnet, 3a 1st permanent magnet part, 3b 2nd Permanent magnet unit, 5 adsorption force increasing coil, 5A adsorption force reducing coil, 10a fixed electrode, 10b movable electrode, 13 movable shaft, 20 movable coil, 21 opening coil, 22 closing coil, 100 switch unit, 101 drive Mechanism, 102 Magnetic latch mechanism, 120 Conductor plate.

Claims

A switch unit having a movable electrode and a fixed electrode;
A movable shaft having the movable electrode fixed to one end thereof;
A movable member fixed to the movable shaft, and an opening coil and a closing coil that are opposed to each other with the movable member interposed therebetween and are slidable with respect to the movable shaft. A pulse current is applied to the opening coil. is separable said movable electrode from the fixed electrode by electromagnetic repulsive force acting between the coil and the movable member for opening poles by energizing the closing coil by energizing the pulse current to the closing coil a drive mechanism which is the movable electrode to the fixed electrode in an electromagnetic repulsive force so as to abut acting between the movable member,
There is provided a yoke through which the movable shaft slidably passes, an arm provided inside the yoke and fixed to the other end of the movable shaft, and a permanent magnet fixed to the inside of the yoke so as to face the armature. The permanent magnet, the armature, and the yoke are attracted to one side of the yoke by a magnetic force generated by one magnetic circuit formed on one side of the switch portion , and the permanent magnet is maintained. A magnetic latch mechanism configured to hold the open state by attracting the armature to the other side of the yoke by the magnetic force of the other magnetic circuit configured on one side of the switch portion side of the armature and the yoke ; Power switchgear provided with.

The power switchgear according to claim 1, wherein the movable member is a coil.

The power switchgear according to claim 1, wherein the movable member is a nonmagnetic conductor plate in which an eddy current is generated.

The permanent magnet in the yoke is fixed to the drive mechanism side, and the permeance of the two magnetic circuits is different so that the holding force in the closed state is larger than the holding force in the open state. The power switchgear according to any one of claims 1 to 3.

The yoke is composed of a first yoke portion having a U-shaped cross section and a second yoke portion having a U-shaped cross section facing the first yoke portion at a distance, and the permanent magnet is the first magnet. 5. The method according to claim 1, further comprising: a first permanent magnet portion fixed to the opening end portion of the yoke; and a second permanent magnet portion fixed to the opening end portion of the second yoke. A power switchgear according to claim 1.

Adsorption that increases the attractive force between the yoke and the amateur by forming a magnetic flux in the same direction as the magnetic flux formed in one magnetic circuit inside one of the two magnetic circuits formed by the yoke, permanent magnet and amateur The power switchgear according to any one of claims 1 to 5, wherein a force increasing coil is provided.

Adsorption that reduces the attractive force between the yoke and the amateur by forming a magnetic flux in the opposite direction to the magnetic flux formed in the other magnetic circuit inside the other of the two magnetic circuits formed by the yoke, permanent magnet and amateur The power switchgear according to claim 6, wherein a force reducing coil is provided.

The yoke is composed of a plate-shaped first yoke portion and a plate-shaped second yoke portion facing the first yoke at a distance, and the permanent magnet is fixed to the first yoke portion. The first permanent magnet portion and the second permanent magnet portion fixed to the second yoke portion, and the armature includes the first permanent magnet portion and the second permanent magnet portion. The switchgear for electric power in any one of Claims 1 thru | or 4 provided between these.

The amateur has a first amateur part that faces the first yoke part across the first permanent magnet part, and a second amateur part that faces the second yoke part across the second permanent magnet part, The switchgear for electric power according to claim 8 constituted from.