JP3672556B2

JP3672556B2 - Non-contact power supply device

Info

Publication number: JP3672556B2
Application number: JP2003014016A
Authority: JP
Inventors: 晋吾小山; 眞植平; 聡 ▲高▼繁
Original assignee: Tsubakimoto Chain Co
Current assignee: Tsubakimoto Chain Co
Priority date: 2003-01-22
Filing date: 2003-01-22
Publication date: 2005-07-20
Anticipated expiration: 2023-01-22
Also published as: JP2004224179A

Description

【０００１】
【発明の属する技術分野】
本発明は、交流電流が流れる給電線に近接して誘導起電力を発生させるピックアップを用いて負荷へ電力を供給する非接触給電装置に関する。
【０００２】
【従来の技術】
定められた経路を走行する移動体を用いて荷物を搬送する搬送設備は、工場内又は倉庫内において広く用いられており、移動体に搭載した走行用のモータ又は荷物の積み下ろし装置などの負荷への電力は、前記経路に沿って付設された給電線を介して供給される。電力を供給する装置の一つとして、移動体側に設けたピックアップを給電線から非接触の状態で該給電線に近接させ、該給電線に流れる交流電流により発生する誘導起電力を負荷へ供給する非接触給電装置がある。
【０００３】
図６は、従来の非接触給電装置の例を示す平面図であり、特許文献１に開示された非接触給電装置の例を示している。図中１は移動体であり、移動体１は軌道６，６に従って移動する構成となっている。軌道６に沿って、交流電流が流れる一対の給電線３が備えられており、給電線３には、給電線３へ交流電流を供給する交流電源５が接続されている。移動体１は、給電線３に近接させたピックアップ２を備えており、ピックアップ２を介して給電線３から電力を得て、図示しない走行用のモータへ供給して、軌道６，６に従って移動する。対になった給電線３は、軌道６に沿って略平行に折り返して敷設されており、夫々一本の給電線３にピックアップ２を近接させた複数の移動体１が互いに略平行に移動する構成となっている。図中の矢印は、電流が流れる方向の例を示しており、給電線３の配置は、軌道６に略平行に、電流の流れる向きが交互に逆向きになった複数の給電線３が並んだ配置となっている。
【０００４】
図７は、従来のピックアップ２の例を示す斜視図であり、特許文献２に開示されたピックアップ２の例を示している。ピックアップ２は、平面視および側面視で矩形、正面視で略Ｃ字状に形成された磁性材製のコア２０１と、コア２０１の非開放側の背部に巻回されたコイル２０２とを用いて構成されており、コイル２０２の両端は、移動体１の走行用モータ等の図示しない負荷へ接続されている。ピックアップ２は、コア２０１のＣ字形状の中に給電線３を位置させて、非接触の状態で給電線３に近接している。給電線３に流れる交流電流により給電線３の周囲には時間的に変化する磁束が発生し、該磁束がコイル２０２に鎖交して誘導起電力が発生し、発生した誘導起電力は移動体の負荷へ供給される。
【０００５】
【特許文献１】
特開２００２−１６５３０１号公報
【特許文献２】
特開平５−２０７６０５号公報
【０００６】
【発明が解決しようとする課題】
特許文献１に開示された非接触給電装置では、交流電流が流れる一対の給電線３が並んだままで折り返して配置されており、並行している複数の給電線３は、外側に位置する給電線３同士、又は内側に位置する給電線３同士に流れる電流が互いに逆向きになるため、給電線３の周囲に発生する電磁界が互いに打ち消されにくく、非接触給電装置を構成する機器又は外部の機器が、電磁界によってノイズの受信または誤作動などの電磁的な影響を受け、安全性が低くなるおそれがある。また、特許文献２に開示された如きピックアップ２を、特許文献１に開示された如く一本の給電線３に近接させて移動体へ電力を供給する場合は、受電容量を大きくするために複数のピックアップ２を備えたときに、複数のピックアップ２が占める長さが長大になるという問題がある。また、ピックアップ２を構成するコイル２０２から電磁界が漏れ、非接触給電装置を構成する機器又は外部の機器へ電磁的な影響を及ぼす恐れがある。
【０００７】
本発明は、斯かる事情に鑑みてなされたものであって、その目的とするところは、給電線の両脇に逆方向の電流が流れる他の給電線を配置し、電流の流れ方が同軸ケーブルでの流れ方に近くなる構成とすることによって、給電線の周囲に発生する電磁界の強度を減少させる非接触給電装置を提供することにある。
【０００８】
また、本発明の他の目的とするところは、略平行で互いに逆方向に電流が流れる複数の給電線の夫々にピックアップを近接させることにより、ピックアップが占める長さの長大化を抑制し、しかもピックアップから漏れる電磁界の強度を減少させる非接触給電装置を提供することにある。
【０００９】
【課題を解決するための手段】
第１発明に係る非接触給電装置は、交流電源と、該交流電源に接続され、該交流電源から供給される交流電流が流れる給電線と、該給電線に近接して誘導起電力を発生させるピックアップとを備える非接触給電装置において、三本以上の複数の給電線が並行的に配置され、最外側の二本を含む外側に位置する複数の第１給電線と、複数の第１給電線の内側に位置する一又は複数の第２給電線とには、合計の電流値が同じで互いに逆向きの電流が流れるべくなしてあることを特徴とする。
【００１０】
第１発明においては、三本以上の複数の給電線を並行的に配置し、外側に位置する第１給電線と内側に位置する第２給電線とには、同じ電流値で互いに逆方向の電流が流れるようにしてあるため、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界の強度が減少する。
【００１１】
第２発明に係る非接触給電装置は、交流電源と、該交流電源に接続され、該交流電源から供給される交流電流が流れる給電線と、該給電線に近接して誘導起電力を発生させるピックアップとを備える非接触給電装置において、ループ状に互いに接続された一対の給電線が並行的に折り返し、しかも折り返した部分で給電線がクロスして配置され、外側に位置する二本の第１給電線と内側に位置する二本の第２給電線とには互いに逆向きに電流が流れるべく配置されてあることを特徴とする。
【００１２】
第２発明においては、対になった給電線を並行して折り返し、折り返した部分で給電線をクロスさせることにより、四本並んだ給電線について、外側の二本の第１給電線と内側の二本の第２給電線とには互いに逆方向に電流が流れるように配置するため、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界の強度が減少する。
【００１３】
第３発明に係る非接触給電装置は、第１給電線に近接した第１ピックアップと、第２給電線に近接した第２ピックアップとを備えることを特徴とする。
【００１４】
第３発明においては、第１給電線に近接した第１ピックアップと、第２給電線に近接した第２ピックアップとを備えることにより、ピックアップが占める長さが短縮され、更に、第１ピックアップ及び第２ピックアップから漏れる電磁界が互いに逆位相となって、互いに打ち消し合って電磁界の強度が減少する。
【００１５】
第４発明に係る非接触給電装置は、交流電流が流れる給電線と、該給電線に近接して誘導起電力を発生させるピックアップとを備える非接触給電装置において、三本の給電線が並行的に配置され、三本の給電線のうち外側に位置する二本の第１給電線の夫々と、内側に位置する第２給電線との間で交流電流がループ状に流れるべくなしてあることを特徴とする。
【００１６】
第４発明においては、並行的な三本の給電線を一組とし、外側の二本の第１給電線の夫々と内側の第２給電線との間でループ状に交流電流が流れるように配置することにより、第１給電線と第２給電線とには互いに逆方向に電流が流れ、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界の強度が減少する。
【００１７】
第５発明に係る非接触給電装置は、二本の前記第１給電線及び前記第２給電線を一組とする複数組の給電線と、複数のピックアップとを備え、複数組の給電線は、互いに並行的に配置され、各組の第２給電線には、交互に逆向きに電流が流れるべくなしてあり、複数のピックアップの夫々を各組の第２給電線に近接させてあることを特徴とする。
【００１８】
第５発明においては、二本の前記第１給電線及び前記第２給電線からなる給電線の組を複数組備え、各組の第２給電線には互い違いに電流が流れるように配置し、各組の第２給電線の夫々にピックアップを近接させることにより、ピックアップが占める長さが短縮され、更に、複数のピックアップから漏れる電磁界が互いに逆位相となって、互いに打ち消し合って電磁界の強度が減少する。
【００１９】
第６発明に係る非接触給電装置は、二本の前記第１給電線及び前記第２給電線の組が並行的に複数回折り返して配置され、複数のピックアップを備え、複数のピックアップの夫々を、並行する複数の第２給電線の夫々に近接させてあることを特徴とする。
【００２０】
第６発明においては、二本の第１給電線および第２給電線の組を並行的に複数回折り返して配置し、並行する複数の第２給電線の夫々にピックアップを近接させることにより、ピックアップが占める長さが短縮され、更に、複数のピックアップから漏れる電磁界が互いに逆位相となって、互いに打ち消し合って電磁界の強度が減少する。
【００２１】
第７発明に係る非接触給電装置は、前記第１給電線の直径は、前記第２給電線の直径よりも大きいことを特徴とする。
【００２２】
第７発明においては、第１給電線の直径を第２給電線の直径よりも大きくすることにより、給電線の周囲に発生する電磁界の強度がより減少し、また、給電線での電力の損失が減少する。
【００２３】
【発明の実施の形態】
以下本発明をその実施の形態を示す図面に基づき具体的に説明する。
（実施の形態１）
図１は、本発明の非接触給電装置を示す模式的平面図である。図中１は、移動体であり、移動体１は、軌道６，６に沿って移動する構成となっている。互いに略平行な二本の軌道６，６の間には、交流電源に接続されループ状に互いに接続された一対の給電線が平行的に折り返して配置されており、このため、移動体１の移動経路には四本の給電線が略平行に位置している。四本の給電線のうちの外側の二本である第１給電線３１，３１と、四本の給電線のうちの内側の二本である第２給電線３２，３２とは、全体でループ状になるように接続線４，４，４を介して互いに接続されており、折り返し部分の接続線４，４はクロスして配置され、交流電源５から交流電流が供給されて第１給電線３１，３１と第２給電線３２，３２とには互いに逆向きに電流が流れるべくなしてある。図中の矢印は、電流が流れる方向の例を示している。移動体１は、一方の第１給電線３１に近接させた第１ピックアップ２１と、一方の第２給電線３２に近接させた第２ピックアップ２２とを備えている。第１ピックアップ２１及び第２ピックアップ２２の構成は、図７に示した従来のピックアップの構成と同様であり、正面視で略Ｃ字状に形成された磁性材製のコアと、コアの非開放側の背部に巻回されたコイルとを用いて構成されており、給電線の周囲に発生する磁束がコイルに鎖交して、コイルに誘導起電力が発生する。第１ピックアップ２１及び第２ピックアップ２２の夫々が備えるコイルの両端は、互いに直列または並列に、移動体１の走行用モータ等の図示しない負荷に接続されており、第１ピックアップ２１及び第２ピックアップ２２は、第１給電線３１及び第２給電線３２に流れる交流電流によって発生した誘導起電力を負荷へ供給する。移動体１は、第１ピックアップ２１及び第２ピックアップ２２から負荷へ電力を供給されて、軌道６，６に従って移動する。
【００２４】
図２は、交流電流の往路と復路とを備える給電線の周囲の電界強度の測定結果を示す図表であり、平行な給電線が作る平面に垂直な方向である縦方向から測定した電界強度と、平行な給電線が作る平面で給電線から離れる方向である横方向から測定した電界強度とを示している。図表の（１）は、給電線の往路と復路とが対になっている場合であり、図表には、その他の夫々の場合について［ｄＢμＶ／ｍ］の単位および［Ｖ／ｍ］の単位で測定した電界強度を、（１）の場合に測定した電界強度に対する比で示している。図表中の（２）は、給電線の復路が往路の両脇の夫々に配置され、往路および復路が同一平面上に位置している場合の電界強度を示している。また、図表中の（３）及び（４）は、往路の給電線と復路の給電線とは、並行的ではあるが、復路の給電線が作る平面上に往路の給電線が位置していない場合の電界強度を示しており、（４）の場合は、（３）の場合に比べて復路の給電線が往路の給電線からより離れている場合を示している。また、図表中の（５）は、（２）の場合に更に別平面上に位置する復路の給電線が加わった場合の電界強度を示しており、図表中の（６）は、往路の両脇の夫々に配置されている復路の給電線が、夫々二本束ねられた形になっている場合の電界強度を示している。交流電流の復路が往路の両脇の夫々に配置されている場合は、交流電流の往路と復路とが対になっている図表中の（１）の場合に比べて、縦方向に離れた位置の電界強度が小さくなっており、給電線の周囲に発生する電磁界が減少していることがわかる。
【００２５】
本発明においては、４本の給電線が並行的に配置され、外側の第１給電線３１，３１と内側の第２給電線３２，３２とは、合計の電流値が同じで互いに逆方向に電流が流れる配置としたため、図２に示した（２）と同様の配置となり、電流の流れ方が同軸ケーブルでの流れ方に近くなって、給電線の周囲に発生する電磁界の強度が小さくなる。これにより、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００２６】
また、本発明においては、第１給電線３１に近接させた第１ピックアップ２１、及び第２給電線３２に近接させた第２ピックアップ２２を備えているため、一本の給電線にピックアップを近接させている従来の非接触給電装置に比べて、ピックアップ全体の長さが短縮される。また、第１ピックアップ２１と第２ピックアップとでは、近接している給電線に流れる電流が互いに逆方向であり、ピックアップを構成するコイルから漏れる電磁界が互いに逆位相となるため、互いに打ち消し合って前記電磁界の強度が小さくなる。これにより、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００２７】
第１給電線３１，３１及び第２給電線３２，３２のうちの第１ピックアップ２１及び第２ピックアップ２２が近接しない他方の第１給電線３１及び第２給電線３２、並びに接続線４には、安価なケーブルを用いてもよく、又、径を大きくしたケーブルを用いてもよい。安価なケーブルを用いた場合には、非接触給電装置のコストが抑制され、又、径を大きくしたケーブルを用いた場合は、交流電流の損失を少なくすることができる。
【００２８】
なお、本実施の形態においては、対になった給電線を折り返して配置することにより、電流の流れ方が同軸ケーブルでの流れ方に近くなるような構成となる形態を示したが、これに限るものではなく、他の配置で本発明の構成を実現する形態としてもよい。図３は、実施の形態１に係る給電線の他の配置を示す模式的平面図である。図３（ａ）に示した配置では、ループ状に交流電源５に接続された給電線が、並行的に二往復して配置され、二往復目が始まる部分と終わる部分とで給電線がクロスする配置とすることにより、外側の第１給電線３１，３１と内側の第２給電線３２，３２とで逆方向の電流が流れる構成としている。また、図３（ｂ）に示した配置では、第１給電線３１と第２給電線３２とを対とした二対の給電線が並列に交流電源５に接続され、並列に接続された第１給電線３１，３１を外側、並列に接続された第２給電線３２，３２を内側にした配置としている。これらの形態においても、外側の第１給電線３１，３１と内側の第２給電線３２，３２とで、合計の電流値が同じで逆方向の電流が流れ、電流の流れ方が同軸ケーブルでの流れ方に近くなって、本発明が実現される。
【００２９】
また、本実施の形態においては、第１給電線３１を二本、第２給電線３２を二本とした形態を示したが、これに限るものではなく、並行的な複数の給電線のうち、第１給電線３１が外側に位置し、第１給電線３１の内側に第２給電線３２が位置している形態であれば、二本以上の第１給電線３１、又は二本以上の第２給電線３２を備える形態としてもよい。また、本実施の形態においては、第１給電線３１，３１及び第２給電線３２，３２を略同一平面上に配置する形態を示したが、給電線が並行的に配置されてあれば、図２に示した（３）〜（５）の如く、立体的に配置してある形態としてもよい。
【００３０】
また、本実施の形態においては、第１ピックアップ２１及び第２ピックアップ２２のコアは、正面視で略Ｃ型のコアとしているが、これに限るものではなく、略コ型などの他の形状のコアを用いてもよい。また、コイルは、コアの非開放側の背部に巻回された形態ではなく、脚部に巻回される等、他の巻回態様により巻回された形態であってもよい。
【００３１】
（実施の形態２）
図４は、本発明の実施の形態２に係る非接触給電装置を示す模式的平面図である。本実施の形態に係る非接触給電装置は、二本の第１給電線３１，３１と、第１給電線３１，３１の間に位置する第２給電線とを互いに並行的に配置しており、第１給電線３１，３１の夫々と第２給電線３２との間で電流がループ状に流れるように、第１給電線３１，３１の一端と第２給電線３２の一端とが接続され、第１給電線３１，３１の他端と第２給電線３２の他端とは交流電源５に接続されている。第１給電線３１，３１の夫々と第２給電線３２との間で交流電流がループ状に流れるため、第１給電線３１，３１と第２給電線３２とでは逆方向に電流が流れる。図中の矢印は、交流電流が流れる方向の例を示している。また、第１給電線３１，３１の直径は、第２給電線３２の直径に比べて大きくなっている。第１給電線３１，３１及び第２給電線３２の組は、移動体１が沿って移動する略平行な二本の軌道６，６の間の位置に、並行的に折り返して配置されている。このため、移動体１の移動経路には、第１給電線３１，３１及び第２給電線３２からなる給電線の組が二組配置されており、並行する第２給電線３２，３２には互いに逆方向に電流が流れる。移動体１は、２個のピックアップ２，２を備えており、ピックアップ２，２の夫々は、給電線の各組の第２給電線３２，３２の夫々に近接している。ピックアップ２，２の夫々が備えるコイルの両端は、互いに直列または並列に、移動体１の走行用モータ等の図示しない負荷に接続されており、ピックアップ２，２は、第２給電線３２，３２に流れる交流電流によって発生した誘導起電力を負荷へ供給する。移動体１は、ピックアップ２，２から負荷へ電力を供給されて、軌道６，６に従って移動する。
【００３２】
本発明においては、並行的な三本の給電線を一組とし、外側の二本の第１給電線３１，３１と中央の一本の第２給電線３２とで互いに逆方向に電流が流れるべくなし、更に、第１給電線３１，３１の直径は、第２給電線３２の直径に比べて大きくなっているため、図２に示した（６）の場合と同様の配置となる。この場合は、図２に示す如く、縦方向および横方向に離れた位置での電界強度が、従来に比べて２割程度まで小さくなっている。従って、本発明の構成により、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界による悪影響を可及的に小さくすることができる。また、第１給電線３１，３１の直径が太くなっていることで、給電線での電力の損失が減少する。
【００３３】
また、本発明においては、互いに逆方向に電流が流れる第２給電線３２，３２の夫々に、ピックアップ２，２の夫々を近接させているため、実施の形態１と同様に、ピックアップ２，２の夫々を構成するコイルから漏れる電磁界が互いに逆位相となるため、互いに打ち消し合って前記電磁界の強度が小さくなる。従って、本発明の構成により、ピックアップ２，２から漏れる電磁界による悪影響を可及的に小さくすることができる。更に、実施の形態１と同様に、ピックアップ全体の長さが短縮される。
【００３４】
なお、本実施の形態においては、二本の第１給電線３１，３１と一本の第２給電線３２とを組にした給電線を折り返して配置することにより、並行的な第２給電線３２，３２に互いに逆方向の電流が流れるような構成とした形態を示したが、これに限るものではなく、他の配置で本発明の構成を実現する形態としてもよい。図５は、実施の形態２に係る給電線の他の配置を示す模式的平面図である。二本の第１給電線３１，３１と一本の第２給電線３２とを一組とする並行的な二組の給電線が並列的に交流電源に接続されており、一組目の第１給電線３１，３１と二組目の第２給電線３２とが並列に接続され、一組目の第２給電線と二組目の第１給電線３１，３１とが並列に接続された配置となっている。この形態においても、各組では第１給電線３１，３１の夫々と第２給電線３２との間で電流がループ状に流れ、更に、並行する第２給電線３２，３２には互いに逆方向の電流が流れるため、本発明が実現される。
【００３５】
また、本実施の形態においては、二本の第１給電線３１，３１と一本の第２給電線３２とを一組とした形態を示したが、第２給電線３２の両脇の夫々に二本束ねた第１給電線３１を配するなどしてより多くの第１給電線３１又は第２給電線３２を一組として配置する形態としてもよい。また、給電線の組を二組配置した形態を示したが、第２給電線３２に流れる電流が交互に逆向きになるようにより多くの給電線の組を配置し、各組の第２給電線３２にピックアップ２を近接させた形態としてもよい。また、本実施の形態においては、全ての給電線を略同一平面上に配置する形態を示したが、給電線が並行的に配置されてあれば、一本の第２給電線３２と二本の第１給電線３１，３１とを立体的に配置した形態としてもよく、給電線の各組を立体的に配置した形態としてもよい。
【００３６】
【発明の効果】
第１発明においては、三本以上の複数の給電線を並行的に配置し、外側に位置する第１給電線と内側に位置する第２給電線とには、同じ電流値で互いに逆方向の電流が流れるようにしてあるため、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界の強度が減少し、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００３７】
第２発明においては、対になった給電線を並行して折り返し、折り返した部分で給電線をクロスさせることにより、四本並んだ給電線について、外側の二本の第１給電線と内側の二本の第２給電線とには互いに逆方向に電流が流れるように配置するため、電流の流れ方が同軸ケーブルでの流れ方に近くなり、給電線の周囲に発生する電磁界の強度が減少し、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００３８】
第３発明においては、第１給電線に近接した第１ピックアップと、第２給電線に近接した第２ピックアップとを備えることにより、ピックアップが占める長さが短縮される。更に、第１ピックアップ及び第２ピックアップから漏れる電磁界が互いに逆位相となって互いに打ち消し合い、前記電磁界の強度が小さくなるため、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００３９】
第４発明においては、並行的な三本の給電線を一組とし、外側の二本の第１給電線の夫々と内側の第２給電線との間でループ状に交流電流が流れるように配置することにより、第１給電線と第２給電線とには互いに逆方向に電流が流れ、電流の流れ方が同軸ケーブルでの流れ方に近くなって給電線の周囲に発生する電磁界の強度が小さくなり、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００４０】
第５発明においては、給電線の組を複数組備え、各組の第２給電線には互い違いに電流が流れるように配置し、各組の第２給電線の夫々にピックアップを近接させることにより、ピックアップが占める長さが短縮される。更に、複数のピックアップから漏れる電磁界が互いに逆位相となって互いに打ち消し合い、前記電磁界の強度が小さくなるため、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００４１】
第６発明においては、二本の第１給電線および第２給電線の組を並行的に複数回折り返して配置し、並行する複数の第２給電線の夫々にピックアップを近接させることにより、ピックアップが占める長さが短縮される。更に、複数のピックアップから漏れる電磁界が互いに逆位相となって互いに打ち消し合い、前記電磁界の強度が小さくなるため、非接触給電装置を構成する機器又は外部の機器が前記電磁界によって受けるノイズの受信または誤作動などの電磁的な悪影響を抑制することができ、非接触給電装置の安全性が向上される。
【００４２】
第７発明においては、第１給電線の直径を第２給電線の直径よりも大きくすることにより、給電線の周囲に発生する電磁界の強度が可及的に小さくなって非接触給電装置の安全性が向上し、また、給電線での電力の損失が減少する等、本発明は優れた効果を奏する。
【図面の簡単な説明】
【図１】本発明の非接触給電装置を示す模式的平面図である。
【図２】交流電流の往路と復路とを備える給電線の周囲の電界強度の測定結果を示す図表である。
【図３】実施の形態１に係る給電線の他の配置を示す模式的平面図である。
【図４】本発明の実施の形態２に係る非接触給電装置を示す模式的平面図である。
【図５】実施の形態２に係る給電線の他の配置を示す模式的平面図である。
【図６】従来の非接触給電装置の例を示す平面図である。
【図７】従来のピックアップの例を示す斜視図である。
【符号の説明】
１移動体
２ピックアップ
２１第１ピックアップ
２２第２ピックアップ
３１第１給電線
３２第２給電線
５交流電源[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a non-contact power supply apparatus that supplies power to a load using a pickup that generates an induced electromotive force in the vicinity of a power supply line through which an alternating current flows.
[0002]
[Prior art]
Transport equipment that transports goods using a moving body that travels on a predetermined route is widely used in factories or warehouses, and is used for loads such as traveling motors mounted on the moving body or load-unloading devices. Is supplied via a feeder line attached along the path. As one of the devices for supplying power, a pickup provided on the moving body side is brought close to the power supply line in a non-contact state from the power supply line, and an induced electromotive force generated by an alternating current flowing through the power supply line is supplied to the load. There is a non-contact power feeding device.
[0003]
FIG. 6 is a plan view illustrating an example of a conventional non-contact power supply apparatus, and illustrates an example of the non-contact power supply apparatus disclosed in Patent Document 1. In the figure, reference numeral 1 denotes a moving body, and the moving body 1 is configured to move according to the tracks 6 and 6. A pair of power supply lines 3 through which an alternating current flows are provided along the track 6, and an AC power supply 5 that supplies an alternating current to the power supply line 3 is connected to the power supply line 3. The moving body 1 includes a pickup 2 close to the power supply line 3, obtains electric power from the power supply line 3 through the pickup 2, supplies it to a motor for travel (not shown), and moves along the tracks 6 and 6. To do. The paired power supply lines 3 are laid back in a substantially parallel manner along the track 6, and a plurality of moving bodies 1 each having a pickup 2 in proximity to one power supply line 3 move substantially parallel to each other. It has a configuration. The arrows in the figure show examples of the direction in which the current flows, and the arrangement of the feeder lines 3 is substantially parallel to the track 6 and a plurality of feeder lines 3 in which the directions in which the current flows are alternately reversed are arranged. It is an arrangement.
[0004]
FIG. 7 is a perspective view showing an example of a conventional pickup 2 and shows an example of the pickup 2 disclosed in Patent Document 2. As shown in FIG. The pickup 2 uses a magnetic material core 201 formed in a rectangular shape in a plan view and a side view and in a substantially C shape in a front view, and a coil 202 wound around a back portion of the core 201 on the non-open side. The both ends of the coil 202 are connected to a load (not shown) such as a traveling motor of the moving body 1. The pickup 2 has the power supply line 3 positioned in the C-shape of the core 201 and is close to the power supply line 3 in a non-contact state. A time-varying magnetic flux is generated around the power supply line 3 by an alternating current flowing through the power supply line 3, and the magnetic flux is linked to the coil 202 to generate an induced electromotive force. Supplied to the load.
[0005]
[Patent Document 1]
JP 2002-165301 A
[Patent Document 2]
JP-A-5-207605
[0006]
[Problems to be solved by the invention]
In the non-contact power supply device disclosed in Patent Document 1, a pair of power supply lines 3 through which an alternating current flows are arranged in a folded state, and a plurality of parallel power supply lines 3 are located outside. 3, or the currents flowing between the feed lines 3 located inside are opposite to each other, so that the electromagnetic fields generated around the feed lines 3 are not easily canceled out, and the devices constituting the non-contact power feed device or external The device may be affected by electromagnetic fields such as reception of noise or malfunction due to electromagnetic fields, which may reduce safety. In addition, when power is supplied to a moving body by bringing the pickup 2 as disclosed in Patent Document 2 close to a single feeder line 3 as disclosed in Patent Document 1, a plurality of pickups 2 are used to increase the power receiving capacity. When the two pickups 2 are provided, there is a problem that the length occupied by the plurality of pickups 2 is long. In addition, an electromagnetic field leaks from the coil 202 constituting the pickup 2, and there is a risk of electromagnetically affecting the equipment constituting the non-contact power feeding device or external equipment.
[0007]
The present invention has been made in view of such circumstances, and the object of the present invention is to arrange another feed line through which a current in the reverse direction flows on both sides of the feed line, and the current flow is coaxial. It is an object of the present invention to provide a non-contact power feeding device that reduces the strength of an electromagnetic field generated around a power feeding line by adopting a configuration that is close to the flow in a cable.
[0008]
Another object of the present invention is to suppress the length of the pickup from being increased by bringing the pickup close to each of a plurality of power supply lines that are substantially parallel and in which currents flow in opposite directions. An object of the present invention is to provide a non-contact power feeding device that reduces the strength of an electromagnetic field leaking from a pickup.
[0009]
[Means for Solving the Problems]
A contactless power supply device according to a first aspect of the invention generates an induced electromotive force in the vicinity of an AC power supply, a power supply line connected to the AC power supply, through which an AC current supplied from the AC power supply flows, and the power supply line. In a non-contact power feeding device including a pickup, a plurality of power feed lines of three or more are arranged in parallel, a plurality of first power feed lines located outside including the outermost two, and a plurality of first power feed lines The one or the plurality of second power supply lines located inside is characterized in that currents having the same total current value and flowing in opposite directions are allowed to flow.
[0010]
In the first invention, three or more power supply lines are arranged in parallel, and the first power supply line located outside and the second power supply line located inside are opposite to each other with the same current value. Since the current flows, the current flows in a manner close to that of the coaxial cable, and the intensity of the electromagnetic field generated around the feeder line decreases.
[0011]
A contactless power supply device according to a second aspect of the invention generates an induced electromotive force in the vicinity of an AC power supply, a power supply line connected to the AC power supply, through which an AC current supplied from the AC power supply flows, and the power supply line. In a non-contact power supply apparatus including a pickup, a pair of power supply lines connected to each other in a loop shape is folded back in parallel, and the power feed lines are arranged so as to cross each other at the folded-back portion, and the two first The feed line and the two second feed lines located inside are arranged so that currents flow in opposite directions to each other.
[0012]
In the second invention, the paired feeder lines are folded in parallel, and the feeder lines are crossed at the folded portion, so that the four arranged feeder lines are arranged on the outer two first feeder lines and the inner one. Since the current flows in the opposite direction to the two second feeders, the current flow is close to that of the coaxial cable, and the strength of the electromagnetic field generated around the feeder is reduced. Decrease.
[0013]
A non-contact power feeding device according to a third aspect of the present invention includes a first pickup close to the first power feed line and a second pickup close to the second power feed line.
[0014]
In the third aspect of the invention, by providing the first pickup close to the first power supply line and the second pickup close to the second power supply line, the length occupied by the pickup is shortened. The electromagnetic fields leaking from the two pickups are in opposite phases and cancel each other, reducing the strength of the electromagnetic field.
[0015]
A contactless power supply device according to a fourth aspect of the present invention is a contactless power supply device including a power supply line through which an alternating current flows and a pickup that generates an induced electromotive force in the vicinity of the power supply line, wherein the three power supply lines are parallel to each other. The AC current is designed to flow in a loop between each of the two first power supply lines located outside of the three power supply lines and the second power supply line located inside. It is characterized by.
[0016]
In the fourth invention, a set of three parallel feed lines is set so that an alternating current flows in a loop between each of the two outside first feed lines and the inside second feed line. As a result of the arrangement, current flows in the opposite direction to the first feed line and the second feed line, and the current flow is close to that of the coaxial cable, and the electromagnetic field generated around the feed line is reduced. Strength decreases.
[0017]
A contactless power supply device according to a fifth aspect of the present invention includes a plurality of sets of power supply lines including a pair of the two first power supply lines and the second power supply line, and a plurality of pickups. Are arranged in parallel to each other, and each pair of second feed lines is designed to allow current to flow alternately in the opposite direction, and each of the plurality of pickups is placed close to each set of second feed lines. It is characterized by.
[0018]
In the fifth invention, a plurality of sets of feed lines composed of the two first feed lines and the second feed lines are provided, and the second feed lines of each set are arranged so that a current flows alternately, By bringing the pickup close to each of the second feeders of each set, the length occupied by the pickup is shortened, and furthermore, the electromagnetic fields leaking from the plurality of pickups are in opposite phases and cancel each other out. Strength decreases.
[0019]
A contactless power supply device according to a sixth aspect of the present invention includes a set of two first power supply lines and a second power supply line that are arranged in a plurality of folds in parallel, includes a plurality of pickups, and each of the plurality of pickups. The plurality of second feeders in parallel are close to each other.
[0020]
In the sixth invention, a set of two first power supply lines and second power supply lines are arranged in a plurality of folded portions in parallel, and the pickup is brought close to each of the plurality of second power supply lines in parallel. Further, the electromagnetic fields leaking from the plurality of pickups are in opposite phases and cancel each other, thereby reducing the strength of the electromagnetic field.
[0021]
The contactless power supply device according to a seventh aspect is characterized in that the diameter of the first power supply line is larger than the diameter of the second power supply line.
[0022]
In the seventh invention, by making the diameter of the first feeder line larger than the diameter of the second feeder line, the strength of the electromagnetic field generated around the feeder line is further reduced, and the electric power in the feeder line is reduced. Loss is reduced.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a schematic plan view showing a non-contact power feeding device of the present invention. In the figure, reference numeral 1 denotes a moving body, and the moving body 1 is configured to move along the tracks 6 and 6. Between the two tracks 6 and 6 that are substantially parallel to each other, a pair of feed lines connected to the AC power source and connected to each other in a loop shape are arranged in parallel and folded. Four feeding lines are positioned substantially parallel to the movement path. The first feed lines 31 and 31 that are the outer two of the four feed lines and the second feed lines 32 and 32 that are the inner two of the four feed lines are looped as a whole. Are connected to each other via connection lines 4, 4, 4, and the connection lines 4, 4 in the folded portion are arranged to cross each other, and an AC current is supplied from the AC power supply 5, so that 31 and 31 and the second feeders 32 and 32 are designed to allow currents to flow in opposite directions. The arrows in the figure show examples of the direction of current flow. The moving body 1 includes a first pickup 21 that is close to one first power supply line 31 and a second pickup 22 that is close to one second power supply line 32. The configuration of the first pickup 21 and the second pickup 22 is the same as the configuration of the conventional pickup shown in FIG. 7, and is a magnetic material core formed in a substantially C shape in front view, and the core is not opened. The coil is wound around the back portion of the side, and the magnetic flux generated around the power supply line is linked to the coil to generate an induced electromotive force in the coil. Both ends of the coils included in each of the first pickup 21 and the second pickup 22 are connected to a load (not shown) such as a traveling motor of the moving body 1 in series or in parallel with each other, and the first pickup 21 and the second pickup 22 supplies an induced electromotive force generated by an alternating current flowing through the first power supply line 31 and the second power supply line 32 to the load. The moving body 1 is supplied with electric power from the first pickup 21 and the second pickup 22 to the load, and moves according to the tracks 6 and 6.
[0024]
FIG. 2 is a chart showing the measurement results of the electric field strength around the feed line including the forward path and the return path of the alternating current, and the electric field intensity measured from the vertical direction, which is the direction perpendicular to the plane formed by the parallel feed lines. The electric field strength measured from the lateral direction, which is the direction away from the feeder line, is a plane formed by the parallel feeder lines. (1) in the chart is the case where the forward path and the return path of the feeder line are paired, and the chart shows the units in [dBμV / m] and [V / m] in the other cases. The measured electric field strength is shown as a ratio to the electric field strength measured in the case of (1). (2) in the chart indicates the electric field strength when the return path of the feeder line is arranged on both sides of the forward path, and the forward path and the return path are located on the same plane. In (3) and (4) in the chart, the forward feed line and the return feed line are parallel, but the forward feed line is not located on the plane formed by the return feed line. In the case of (4), the case where the return power supply line is further away from the forward power supply line than in the case of (3) is shown. In addition, (5) in the chart shows the electric field strength when a return power supply line located on another plane is added in the case of (2), and (6) in the chart shows both of the forward paths. The electric field strength is shown in the case where the return power supply lines arranged on the sides are bundled in two. When the return path of the alternating current is arranged on both sides of the forward path, the position is longer in the vertical direction than in the case of (1) in the diagram in which the forward path and the return path of the alternating current are paired. It can be seen that the electric field strength of the electric field is small, and the electromagnetic field generated around the feeder line is reduced.
[0025]
In the present invention, four feed lines are arranged in parallel, and the outer first feed lines 31 and 31 and the inner second feed lines 32 and 32 have the same total current value and are opposite to each other. Since the arrangement is such that the current flows, the arrangement is the same as (2) shown in FIG. 2, the current flow is close to that of the coaxial cable, and the strength of the electromagnetic field generated around the feeder line is small. Become. As a result, it is possible to suppress electromagnetic adverse effects such as reception of noise or malfunction caused by the electromagnetic field received by the devices constituting the contactless power supply device or external devices, and the safety of the contactless power supply device is improved. The
[0026]
In the present invention, since the first pickup 21 close to the first power supply line 31 and the second pickup 22 close to the second power supply line 32 are provided, the pickup is close to one power supply line. Compared with the conventional non-contact power feeding apparatus, the entire length of the pickup is shortened. In addition, in the first pickup 21 and the second pickup, the currents flowing through the adjacent feeder lines are in opposite directions, and the electromagnetic fields leaking from the coils constituting the pickup are in opposite phases, so they cancel each other out. The intensity of the electromagnetic field is reduced. As a result, it is possible to suppress electromagnetic adverse effects such as reception of noise or malfunction caused by the electromagnetic field received by the devices constituting the contactless power supply device or external devices, and the safety of the contactless power supply device is improved. The
[0027]
Of the first feed lines 31, 31 and the second feed lines 32, 32, the first feed line 31, the second feed line 32, and the connection line 4, which are not close to each other, are not connected to the first pickup 21 and the second pickup 22. An inexpensive cable may be used, or a cable having a larger diameter may be used. When an inexpensive cable is used, the cost of the non-contact power feeding device is suppressed, and when a cable having a large diameter is used, the loss of alternating current can be reduced.
[0028]
In the present embodiment, a configuration has been shown in which a pair of feeder lines are folded and arranged so that the current flow is close to that of the coaxial cable. However, the present invention is not limited thereto, and the configuration of the present invention may be realized in other arrangements. FIG. 3 is a schematic plan view showing another arrangement of the feeder line according to the first embodiment. In the arrangement shown in FIG. 3A, the feed line connected to the AC power supply 5 in a loop shape is arranged to reciprocate twice in parallel, and the feed line crosses between the portion where the second round trip starts and the end portion. By adopting such an arrangement, a current in the reverse direction flows between the outer first feeder lines 31 and 31 and the inner second feeder lines 32 and 32. Further, in the arrangement shown in FIG. 3B, two pairs of power supply lines, each paired with the first power supply line 31 and the second power supply line 32, are connected in parallel to the AC power source 5, and are connected in parallel. The arrangement is such that one feed line 31, 31 is on the outside, and the second feed line 32, 32 connected in parallel is on the inside. Also in these forms, the outer first feed lines 31 and 31 and the inner second feed lines 32 and 32 have the same total current value and the reverse current flows, and the current flows in the coaxial cable. The present invention is realized close to the flow of the above.
[0029]
In the present embodiment, the first power supply line 31 and the second power supply line 32 are shown as two. However, the present invention is not limited to this. As long as the first power supply line 31 is positioned outside and the second power supply line 32 is positioned inside the first power supply line 31, two or more first power supply lines 31, or two or more The second power supply line 32 may be provided. Moreover, in this Embodiment, although the form which arrange | positions the 1st electric power feeding lines 31 and 31 and the 2nd electric power feeding lines 32 and 32 on substantially the same plane was shown, if an electric power feeding line is arrange | positioned in parallel, It is good also as a form arrange | positioned in three dimensions like (3)-(5) shown in FIG.
[0030]
In the present embodiment, the cores of the first pickup 21 and the second pickup 22 are substantially C-shaped cores when viewed from the front. However, the present invention is not limited to this. A core may be used. In addition, the coil may not be wound around the back portion on the non-open side of the core, but may be wound around other winding modes such as being wound around the leg portion.
[0031]
(Embodiment 2)
FIG. 4 is a schematic plan view showing a non-contact power feeding apparatus according to Embodiment 2 of the present invention. In the non-contact power feeding device according to the present embodiment, two first power feeding lines 31 and 31 and a second power feeding line located between the first power feeding lines 31 and 31 are arranged in parallel to each other. The one end of the first power supply lines 31 and 31 and the one end of the second power supply line 32 are connected so that a current flows in a loop between each of the first power supply lines 31 and 31 and the second power supply line 32. The other end of the first power supply lines 31 and 31 and the other end of the second power supply line 32 are connected to the AC power supply 5. Since an alternating current flows in a loop between each of the first power supply lines 31 and 31 and the second power supply line 32, a current flows in the opposite direction between the first power supply lines 31 and 31 and the second power supply line 32. The arrows in the figure show examples of directions in which alternating current flows. The diameters of the first power supply lines 31 and 31 are larger than the diameter of the second power supply line 32. The set of the first power supply lines 31 and 31 and the second power supply line 32 is folded back in parallel at a position between two substantially parallel tracks 6 and 6 along which the moving body 1 moves. . For this reason, two sets of feed lines made up of the first feed lines 31 and 31 and the second feed line 32 are arranged on the moving path of the moving body 1, and the second feed lines 32 and 32 in parallel are arranged in parallel. Currents flow in opposite directions. The moving body 1 includes two pickups 2 and 2, and each of the pickups 2 and 2 is close to each of the second feed lines 32 and 32 of each set of feed lines. Both ends of the coils included in each of the pickups 2 and 2 are connected in series or in parallel to a load (not shown) such as a traveling motor of the moving body 1, and the pickups 2 and 2 are connected to the second feed lines 32 and 32. The induced electromotive force generated by the alternating current flowing in the is supplied to the load. The moving body 1 is supplied with electric power from the pickups 2 and 2 to the load, and moves along the tracks 6 and 6.
[0032]
In the present invention, a set of three parallel feed lines is used as a set, and currents flow in opposite directions between the two outer first feed lines 31 and 31 and the central second feed line 32. As a matter of course, since the diameters of the first power supply lines 31 and 31 are larger than the diameter of the second power supply line 32, the arrangement is the same as in the case of (6) shown in FIG. In this case, as shown in FIG. 2, the electric field strength at positions separated in the vertical and horizontal directions is reduced to about 20% compared to the conventional case. Therefore, according to the configuration of the present invention, the flow of current is close to that of the coaxial cable, and the adverse effect of the electromagnetic field generated around the feeder line can be minimized. Moreover, the loss of the electric power in a feeder line reduces because the diameter of the 1st feeder lines 31 and 31 is thick.
[0033]
In the present invention, since the pickups 2 and 2 are close to the second feeders 32 and 32 through which currents flow in opposite directions, the pickups 2 and 2 are the same as in the first embodiment. Since the electromagnetic fields leaking from the coils constituting each of them are in opposite phases with each other, they cancel each other and the intensity of the electromagnetic field decreases. Therefore, the configuration of the present invention can minimize the adverse effect caused by the electromagnetic field leaking from the pickups 2 and 2 as much as possible. Further, the length of the entire pickup is reduced as in the first embodiment.
[0034]
In the present embodiment, the parallel second power supply lines are formed by folding and arranging the power supply lines in which two first power supply lines 31, 31 and one second power supply line 32 are paired. Although a configuration in which currents in opposite directions flow through 32 and 32 is shown, the present invention is not limited to this, and a configuration in which the configuration of the present invention is realized in other arrangements may be used. FIG. 5 is a schematic plan view showing another arrangement of the feeder line according to the second embodiment. Two sets of parallel feed lines, each of which includes two first feed lines 31 and 31 and one second feed line 32, are connected in parallel to the AC power source, and the first set The first power supply lines 31 and 31 and the second set of second power supply lines 32 are connected in parallel, and the first set of second power supply lines and the second set of first power supply lines 31 and 31 are connected in parallel. It is an arrangement. Also in this form, in each set, current flows in a loop between each of the first feed lines 31 and 31 and the second feed line 32, and the parallel second feed lines 32 and 32 are opposite to each other. Therefore, the present invention is realized.
[0035]
Further, in the present embodiment, the configuration in which the two first power supply lines 31 and 31 and the one second power supply line 32 are set as one set is shown. It is also possible to arrange a larger number of first power supply lines 31 or second power supply lines 32 as a set by arranging two first power supply lines 31 bundled together. Moreover, although the form which has arrange | positioned two sets of feeder lines was shown, more pairs of feeder lines are arrange | positioned so that the electric current which flows into the 2nd feeder line 32 may become reverse direction alternately, and the 2nd feed of each group It is good also as a form which made pickup 2 adjoin to electric wire 32. FIG. Moreover, in this Embodiment, although the form which arrange | positions all the electric power feeding lines on a substantially identical plane was shown, if the electric power feeding lines are arrange | positioned in parallel, one 2nd electric power feeding line 32 and two The first power supply lines 31 and 31 may be arranged in a three-dimensional manner, or each set of power supply lines may be arranged in a three-dimensional manner.
[0036]
【The invention's effect】
In the first invention, three or more power supply lines are arranged in parallel, and the first power supply line located outside and the second power supply line located inside are opposite to each other with the same current value. Since the current flows, the current flow is close to that of the coaxial cable, the intensity of the electromagnetic field generated around the power supply line is reduced, and the equipment constituting the non-contact power supply device or the external Electromagnetic adverse effects such as reception or malfunction of noise received by the electromagnetic field of the device can be suppressed, and the safety of the non-contact power feeding device is improved.
[0037]
In the second invention, the paired feeder lines are folded in parallel, and the feeder lines are crossed at the folded portion, so that the four arranged feeder lines are arranged on the outer two first feeder lines and the inner one. Since the current flows in the opposite direction to the two second feeders, the current flow is close to that of the coaxial cable, and the strength of the electromagnetic field generated around the feeder is reduced. It is possible to reduce the electromagnetic adverse effects such as noise reception or malfunction that the devices constituting the contactless power supply device or external devices receive by the electromagnetic field, and the safety of the contactless power supply device is improved. The
[0038]
In the third aspect of the invention, the length occupied by the pickup is shortened by providing the first pickup close to the first power supply line and the second pickup close to the second power supply line. Furthermore, the electromagnetic fields leaking from the first pickup and the second pickup are in opposite phases and cancel each other, so that the intensity of the electromagnetic field is reduced. Electromagnetic adverse effects such as reception of noise or malfunction caused by the above can be suppressed, and the safety of the non-contact power feeding device is improved.
[0039]
In the fourth invention, a set of three parallel feed lines is set so that an alternating current flows in a loop between each of the two outside first feed lines and the inside second feed line. As a result of the arrangement, current flows in the opposite direction to the first feed line and the second feed line, and the flow of current is close to that of the coaxial cable so that the electromagnetic field generated around the feed line is reduced. The strength of the contactless power supply device can be reduced, and electromagnetic adverse effects such as noise reception or malfunction caused by the electromagnetic field received by the devices constituting the contactless power supply device or external devices can be suppressed. Be improved.
[0040]
In the fifth invention, by providing a plurality of sets of feed lines, arranging the second feed lines of each set so that current flows alternately, and bringing the pickup close to each of the second feed lines of each set The length occupied by the pickup is reduced. Furthermore, the electromagnetic fields leaking from the plurality of pickups are in opposite phases and cancel each other, and the strength of the electromagnetic field is reduced. Therefore, the noise that the devices constituting the non-contact power feeding device or external devices receive by the electromagnetic field is reduced. Electromagnetic adverse effects such as reception or malfunction can be suppressed, and the safety of the non-contact power feeding device is improved.
[0041]
In the sixth invention, a set of two first power supply lines and a second power supply line is arranged in a plurality of times in parallel, and the pickup is brought close to each of the plurality of parallel second power supply lines. The length occupied by is reduced. Furthermore, the electromagnetic fields leaking from a plurality of pickups are mutually opposite in phase and cancel each other, and the intensity of the electromagnetic field is reduced, so that the noise constituting the non-contact power feeding device or the external device is affected by the electromagnetic field. Electromagnetic adverse effects such as reception or malfunction can be suppressed, and the safety of the non-contact power feeding device is improved.
[0042]
In the seventh invention, by making the diameter of the first feed line larger than the diameter of the second feed line, the strength of the electromagnetic field generated around the feed line becomes as small as possible, and the contactless power supply device The present invention has excellent effects such as improved safety and reduced power loss in the feeder line.
[Brief description of the drawings]
FIG. 1 is a schematic plan view showing a non-contact power feeding device of the present invention.
FIG. 2 is a chart showing measurement results of electric field strength around a feeder line having an AC current forward path and a return path.
FIG. 3 is a schematic plan view showing another arrangement of the feeder line according to the first embodiment.
FIG. 4 is a schematic plan view showing a non-contact power feeding apparatus according to Embodiment 2 of the present invention.
FIG. 5 is a schematic plan view showing another arrangement of the feeder line according to the second embodiment.
FIG. 6 is a plan view showing an example of a conventional non-contact power feeding device.
FIG. 7 is a perspective view showing an example of a conventional pickup.
[Explanation of symbols]
1 Mobile object
2 Pickup
21 First pickup
22 Second pickup
31 First feeder
32 Second feeder
5 AC power supply

Claims

In a non-contact power supply device including an AC power supply, a power supply line connected to the AC power supply and through which an AC current supplied from the AC power supply flows, and a pickup that generates an induced electromotive force in the vicinity of the power supply line,
A plurality of three or more feeders are arranged in parallel, and a plurality of first feeders located outside including the outermost two, and one or a plurality of first feeders located inside the plurality of first feeders The non-contact power feeding device, wherein the two power lines have the same total current value and are intended to allow currents in opposite directions to flow.

In a non-contact power supply device including an AC power supply, a power supply line connected to the AC power supply and through which an AC current supplied from the AC power supply flows, and a pickup that generates an induced electromotive force in the vicinity of the power supply line,
A pair of feed lines connected to each other in a loop shape are folded back in parallel, and the feed lines are arranged so as to cross each other at the folded portion, and the two first feed lines located on the outside and the two feed lines located on the inside A non-contact power feeding device, wherein the second power feeding line is arranged so that currents flow in opposite directions to each other.

The non-contact power feeding apparatus according to claim 1, comprising a first pickup close to the first power feed line and a second pickup close to the second power feed line.

In a non-contact power supply apparatus including a power supply line through which an alternating current flows and a pickup that generates an induced electromotive force in the vicinity of the power supply line,
Three feed lines are arranged in parallel, and an alternating current loops between each of the two first feed lines located on the outside of the three feed lines and the second feed line located on the inside A non-contact power feeding device, wherein the non-contact power feeding device is configured to flow in a shape.

A plurality of power supply lines each including two first power supply lines and the second power supply line, and a plurality of pickups, and the plurality of power supply lines are arranged in parallel to each other. 5. The non-feed according to claim 4, wherein an electric current flows alternately in the opposite direction to the second feeder, and each of the plurality of pickups is brought close to the second feeder of each set. Contact power supply device.

A set of two first power supply lines and a second power supply line are arranged in a plurality of folded portions in parallel, and are provided with a plurality of pickups. The non-contact power feeding device according to claim 4, wherein the non-contact power feeding device is adjacent to the power source.

The non-contact power feeding device according to claim 4, wherein a diameter of the first power feeding line is larger than a diameter of the second power feeding line.