JP2004014897A

JP2004014897A - Transformer and manufacturing method thereof

Info

Publication number: JP2004014897A
Application number: JP2002168132A
Authority: JP
Inventors: Akira Hashimoto; 橋本　昭; Hitoshi Ota; 太田　斎; Yuji Nakahara; 中原　裕治; Hiroyuki Akita; 秋田　裕之; Masafumi Uenushi; 植主　雅史
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-06-10
Filing date: 2002-06-10
Publication date: 2004-01-15

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transformer that can reduce its cost by saving the material. <P>SOLUTION: A plurality of core pieces 11 are formed by dividing thereinto longitudinally a strip-form member 12 having a predetermined width. A core member 14 is formed by laminating the core pieces 11 integrally with each other and by coupling each other in succession the plurality of laminated core pieces 11 via thin portions 13 of bendable coupling portions. The transformer has a core formed annularly by bending the thin portions 13 of the core member 14 and has a secondary winding wound on the core pieces 11. Further, positioning notches 11a are so formed in the symmetric positions of both the latitudinal side-surfaces of each core piece 11 having the secondary winding wound thereon as to regulate the winding position of the secondary winding by the positioning notches 11a. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
この発明は、例えば遮断器に内蔵され一次導体を流れる電流を検出する変成器の構成およびその製造方法に関するものである。
【０００２】
【従来の技術】
図１９は例えば特開２０００−９１１４５号公報に開示されたこの種従来の変成器の構成を示す平面図、図２０は図１９における変成器の製造工程を示す平面図である。
図において、１は図２０（Ａ）に示すように磁性材料でなるヨーク片で、一端側裏表面に連結部としての凹部１ａおよび凸部１ｂが形成されるとともに、その端面１ｃはこれら凹、凸部１ａ、１ｂの中心を中心とした円弧状に形成され、他端側には相隣なるヨーク片１の端面１ｃと嵌合可能な端面１ｄが形成されている。２は複数のヨーク片１が各端面１ｃ、１ｄを介して配列された第１のコア部材である。
【０００３】
３は図２０（Ａ）に示すように各ヨーク片１が第１のコア部材２とは長手方向に互い違いに配列された第２のコア部材で、図２０（Ｂ）に示すように第１のコア部材２と交互に積層され抜きかしめにより一体化されている。そして、図示はしないが積層方向に相隣なるコア片１同士の凹部１ａおよび凸部１ｂが嵌合されることにより回転自在に連結されており、第１のコア部材２と共にコア４を構成している。５はコア４が内部を貫通して嵌挿される絶縁ボビン、６はこの絶縁ボビン５に巻回された二次巻線、７は二次巻線６を巻回後、凹、凸部１ａ、１ｂの嵌合部を回転させることによりコア４を屈曲させ、環状に形成して構成される変成器である。
【０００４】
【発明が解決しようとする課題】
従来の変成器は以上のように構成され、金型（図示せず）により板状部材から図２０（Ａ）に示すような配置で、第１および第２のコア部材２、３を打ち抜き加工し、図２０（Ｂ）に示すように交互に積層一体化することによりコア４を形成しているので、図からも明らかなように第１および第２のコア部材２、３間にはスペースが存在し、又、図示はしないが抜きかしめの際に位置決めの基準となるパイロット穴等を明けるためのスペースが必要となるため、材料の歩留りが悪くコストの増大を招くという問題点があった。
【０００５】
この発明は上記のような問題点を解消するためになされたもので、材料の歩留りを向上させてコストの低減を図ることが可能な変成器およびその製造方法を提供することを目的とするものである。
【０００６】
【課題を解決するための手段】
この発明の請求項１に係る変成器は、所定の幅を有する帯状部材を長手方向に分割して形成される複数のコア片を積層して一体化し、屈曲可能な連結部を介して順次連結することにより形成されたコア部材の連結部を屈曲させることにより環状に形成されたコア、およびコア片に巻回された二次巻線とを備え、二次巻線が巻回されたコア片の幅方向両側面の対称位置に位置決め用切り欠きが形成され、二次巻線は位置決め用切り欠きにより巻回位置が規制されているものである。
【０００７】
又、この発明の請求項２に係る変成器は、請求項１において、位置決め用切り欠きは、コア片の連結方向に二次巻線の巻回高さと等しい長さに形成されているものである。
【０００８】
又、この発明の請求項３に係る変成器は、請求項２において、位置決め用切り欠きの深さは、下記式に基づく寸法に形成されているものである。
ｄ／２≦Ｄ＜ｄ
但し、　Ｄ：位置決め用切り欠きの深さ
ｄ：二次巻線の線径
【０００９】
又、この発明の請求項４に係る変成器は、請求項１において、位置決め用切り欠きは、コア片の連結方向に二次巻線の巻回高さと等しい間隔を介し、短尺長さで且つ一対ずつ位置決め部材が係合可能に形成されているものである。
【００１０】
又、この発明の請求項５に係る変成器は、請求項１ないし４のいずれかにおいて、コア片を積層して一体化する手段は、位置決め用切り欠きの近傍に配置されているものである。
【００１１】
又、この発明の請求項６に係る変成器は、請求項１ないし５のいずれかにおいて、位置決め用切り欠きは、各コア片で同じ形状に形成されているものである。
【００１２】
又、この発明の請求項７に係る変成器の製造方法は、所定の幅を有する帯状部材の幅方向両側面の対称位置に位置決め用切り欠きを形成する工程と、帯状部材を長手方向に分割してコア片を形成し連結部を介して連結するとともに所定の枚数積層し位置決め用切り欠きを基準に一体化してコア部材を形成する工程と、コア片に位置決め用切り欠きにより位置を規制して二次巻線を巻回する工程と、連結部を屈曲させることによりコアを環状に形成する工程とを包含したものである。
【００１３】
又、この発明の請求項８に係る変成器の製造方法は、所定の幅を有する帯状部材の幅方向両側面の対称位置に位置決め用切り欠きを形成する工程と、帯状部材を長手方向に分割してコア片を形成し所定の枚数積層し位置決め用切り欠きを基準に一体化する工程と、積層して一体化されたコア片を連結部を介して連結することによりコア部材を形成する工程と、コア片に位置決め用切り欠きにより位置を規制して二次巻線を巻回する工程と、連結部を屈曲させることによりコアを環状に形成する工程とを包含したものである。
【００１４】
【発明の実施の形態】
以下、この発明の実施の形態を図に基づいて説明する。
実施の形態１．
図１はこの発明の実施の形態１における変成器の構成を示す正面図、図２は図１における変成器のコアを形成するコア部材の構成を示す平面図、図３は図２におけるコア部材の要部の構成を示す平面図、図４は図１における変成器のかしめ部の構成を示す断面図、図５は図２におけるコア部材に二次巻線を巻回した状態を示す一部断面平面図、図６は図２におけるコア部材の製造工程を示す斜視図、図７は図１における変成器のかしめ部の図４とは異なる構成を示す断面図である。
【００１５】
図において、１１は所定の幅を有する帯状部材１２を長手方向に分割（図示では４分割）して形成されるコア片で、連結部としての薄肉部１３を介して連結されており、所定のコア片１１の幅方向両側面の対称の位置に位置決め用切り欠き１１ａが形成されている。そして、この位置決め用切り欠き１１ａは図３に示すように連結方向に後述の二次巻線の巻回高さと等しい長さＬで、深さＤは二次巻線の線径をｄとすると、ｄ／２≦Ｄ＜ｄの範囲の寸法に形成されており、位置決め用切り欠き１１ａの近傍の裏表面には、嵌合可能な凹部１１ｂおよび凸部１１ｃがそれぞれ形成されている。
【００１６】
１４は薄肉部１３を介して連結されたコア片１１を、図４に示すように所定の枚数（図示では７枚）積層し、積層方向に隣接する各凹、凸部１１ｂ、１１ｃ同士を嵌合させて抜きかしめることにより固着一体化して形成されるコア部材、１５はこのコア部材１４の所定のコア片１１に巻回された二次巻線で、位置決め用切り欠き１１ａにより巻回位置が規制されている。１６は二次巻線１５が巻回されたコア部材１４の薄肉部１３を屈曲させることにより環状に形成されるコアであり、コア部材１４の当接された端部同士を例えば溶接等で固着させることにより変成器が構成されている。
【００１７】
次に、上記のように構成される実施の形態１における変成器の製造方法を図に基づいて説明する。
まず、図６に示すように所定の幅を有する帯状部材１２の幅方向両側面の対称位置に、位置決め用切り欠き１１ａを形成する。次いで、帯状部材１２を長手方向に４分割して薄肉部１３を介して連結されるコア片１１を形成する。この時、位置決め用切り欠き１１ａが形成されるコア片１１の裏表面に、凹、凸部１１ｂ、１１ｃが同時に形成される。
【００１８】
次いで、上記のようにして形成された４片のコア片１１を順次積層し、積層方向に相隣なる凹、凸部１１ｂ、１１ｃ同士を嵌合させて抜きかしめることにより固着一体化してコア部材１４を形成する。次いで、図５に示すように位置決め用切り欠き１１ａに二次巻線１５を巻回する。その後、薄肉部１３を屈曲させてコア部材１４を環状にしてコア１６を形成するとともに、当接された端部同士を例えば溶接等で固着することにより変成器が完成する。
なお、上記工程における各コア片１１、各凹、凸部１１ｂ、１１ｃ等の形成は、位置決め用切り欠き１１ａを基準にして行われることは言うまでもない。
【００１９】
このように上記実施の形態１によれば、所定の幅を有する帯状部材１２の幅方向両側面の対称位置に、位置決め用切り欠き１１ａを形成し、この位置決め用切り欠き１１ａを基準にして、帯状部材１２を長手方向に分割してコア片１１を形成するようにしているので、切り落とされて廃材となる部分を大幅に少なく抑えることができるため、材料の歩留りを向上させることができ、コストの低減を図ることが可能になる。
【００２０】
又、位置決め用切り欠き１１ａを二次巻線１５の巻回高さと等しい長さＬに形成しているので、二次巻線１５の巻回が容易となり組立作業性の向上を図ることが可能になる。
又、位置決め用切り欠き１１ａの深さＤを、ｄ／２≦Ｄ＜ｄの範囲の寸法で形成するようにしているので、磁路への影響を最小限に抑えて組立作業性の向上を図ることが可能になる。
又、抜きかしめのための凹、凸部１１ｂ、１１ｃを、位置決め用切り欠き１１ａの近傍に配置しているので、コア片１１を積層する際のずれを抑えることができ、組立精度を上げて信頼性の向上を図ることが可能になる。
【００２１】
なお、上記構成では二次巻線１５が巻回されるコア片１１にのみ、位置決め用切り欠き１１ａが形成された場合について説明したが、残りのコア片１１にも位置決め用切り欠き１１ａを形成しても良く、各コア片１１の位置決め用切り欠き１１ａを同一の形状とすることにより、金型を簡素化することができ、さらにコストの低減を図ることが可能になる。
又、上記構成ではコア片１１を積層して一体化する手段として、お互いに嵌合する凹、凸部１１ｂ、１１ｃを用いた場合について説明したが、図７に示すように各コア片１１に位置決め用切り欠き１１ａを基準として穴１１ｄをそれぞれ形成し、これら各穴１１ｄにかしめ用ピン１７を貫通させて固定し一体化するようにしても良く、図４に示すように抜きかしめをする場合と比較し、穴１１ｄの位置精度をゆるめることができるため、加工が容易となりさらにコストの低減を図ることが可能になる。
【００２２】
実施の形態２．
図８はこの発明の実施の形態２における変成器の構成を一部を断面にして示す正面図、図９は図８における変成器のコアを形成するコア部材の構成を示す平面図、図１０は図９におけるコア部材に二次巻線を巻回した状態を一部を断面にして示す平面図である。
図において、上記実施の形態１におけると同様な部分は同一符号を付して説明を省略する。
【００２３】
２１は所定の幅を有する帯状部材１２を長手方向に分割（図示では４分割）して形成されるコア片で、連結部としての薄肉部２２を介して連結されている。そして、幅方向両側面の対称位置には、連結方向に二次巻線１５の巻回高さと等しい間隔Ｌ_１を介して、それぞれ一対ずつ短尺の位置決め用切り欠き２１ａが形成されており、これら各位置決め用切り欠き２１ａの近傍の裏表面には、嵌合可能な凹部２１ｂおよび凸部２１ｃがそれぞれ形成されている。
【００２４】
２３は薄肉部２２を介して連結されたコア片２１を所定の枚数積層し、積層方向に隣接する各凹、凸部２１ｂ、２１ｃ同士を嵌合させて抜きかしめることにより固着一体化して形成されるコア部材、２４は各位置決め用切り欠き２１ａに係合可能な板状の位置決め部材で、二次巻線１５を巻回する時にそれぞれ各位置決め用切り欠き２１ａに係合され、二次巻線１５の巻回位置を規制する。２５は二次巻線１５が巻回されたコア部材２３の薄肉部２２を、屈曲させることにより環状に形成されるコアであり、コア部材２３の当接された端部同士を、例えば溶接等で固着させることにより変成器が構成されている。
【００２５】
このように上記実施の形態２によれば、コア片２１の幅方向両側面の対称位置に、連結方向に二次巻線１５の巻回高さと等しい間隔Ｌ_１を介して、一対ずつ短尺の位置決め用切り欠き２１ａを形成し、これら各位置決め用切り欠き２１ａに係合する位置決め部材２４により二次巻線１５の巻回位置を規制するようにしているので、位置決め用切り欠き２１ａが短尺になった分だけ、材料の歩留りをさらに向上させるとともに、磁路への影響を最小限に抑え得ることは勿論のこと、位置決め部材２４を用いたことにより二次巻線１５の巻回が容易となり、組立作業性の向上を図ることが可能になる。
【００２６】
なお、上記構成では二次巻線１５が巻回されるコア片２１にのみ、位置決め用切り欠き２１ａが形成された場合について説明したが、上記実施の形態１におけると同様に残りのコア片２１にも位置決め用切り欠き２１ａを形成しても良く、各コア片２１の位置決め用切り欠き２１ａを同一の形状とすることにより、金型を簡素化することができ、さらにコストの低減を図ることが可能になる。
又、抜きかしめのための凹、凸部２１ｂ、２１ｃを、位置決め用切り欠き２１ａの近傍に配置しているので、コア片２１を積層する際のずれを抑えることができ、組立精度を上げて信頼性の向上を図ることが可能になる。
【００２７】
実施の形態３．
図１１はこの発明の実施の形態３における変成器の構成を示す正面図、図１２は図１１における変成器のコア部材の構成を示す平面図、図１３は図１２におけるコア部材の要部の構成を示す平面図、図１４は図１３におけるコア部材の要部の構成を示す側面図、図１５は図１３における線ＸＶ−ＸＶに沿った断面を示す断面図、図１６は図１３におけるコア部材の要部を展開して示す平面図、図１７は図１２におけるコア部材の組立方法を示し、（Ａ）は平面図、（Ｂ）は側断面図、図１８は図１２におけるコア部材に二次巻線を巻回した状態を示す一部断面平面図である。
【００２８】
図において、上記各実施の形態１、２におけると同様な部分は同一符号を付して説明を省略する。３１は所定の幅を有する帯状部材１２を長手方向に分割して形成されるコア片で、図１３に示すように幅方向両側面の対称の位置には、上記実施の形態１におけると同様に、二次巻線１５の巻回高さと等しい長さＬで、深さＤが二次巻線１５の線径をｄとすると、ｄ／２≦Ｄ＜ｄの範囲の寸法の位置決め用切り欠き３１ａが形成されている。そして、一端側には後述の連結ピンが貫通されるピン穴３１ｂが形成されるとともに、その端面３１ｃはこのピン穴３１ｂの中心を中心とした円弧状に形成され、他端側には相隣なるヨーク片３１の端面３１ｃと嵌合可能な端面３１ｄが形成されている。又、位置決め用切り欠き３１ａの近傍の裏表面には、嵌合可能な凹部３１ｅおよび凸部３１ｆがそれぞれ形成されている。
【００２９】
３２はコア部材で、コア片３１を図１６に示すように長手方向に両端面３１ｃ、３１ｄが互い違いとなるように配置し、図１４に示すように積層するとともに、図１５に示すように積層方向に相隣なる凹、凸部３１ｅ、３１ｆ同士を嵌合させて抜きかしめることにより固着一体化してコア片ブロック３３を形成し、コア片ブロック３３の両端のピン穴３１ｂ同士に連結手段としての連結ピン３４を貫通させることにより連結一体化して構成されている。３５は図１８に示すように二次巻線１５が巻回されたコア部材３２を、各コア片ブロック３３を連結ピン３４を中心として回動させることにより屈曲させて環状に形成されるコアであり、コア部材３２の両端のピン穴３１ｂ同士にも連結ピン３４を貫通させて環状を拘束することにより変成器が構成されている。
【００３０】
次に、上記のように構成される実施の形態３における変成器の製造方法を図に基づいて説明する。
まず、図示はしないが所定の幅を有する帯状部材１２の幅方向両側面の対称位置に、長手方向に所定の間隔を介して位置決め用切り欠き３１ａを順次形成する。次いで、帯状部材１２をこれら各位置決め用切り欠き３１ａを基準にして所定の長さに分割しコア片３１を形成する。この時、コア片３１の位置決め用切り欠き３１ａの近傍の裏表面に、凹、凸部３１ｅ、３１ｆを同時に形成する。
【００３１】
次いで、上記のようにして形成されるコア片３１を、図１６に示すように長手方向に両端面３１ｃ、３１ｄが互い違いとなるように配置し、この順序で図１５に示すように積層し、積層方向に相隣なる凹、凸部３１ｅ、３１ｆ同士を嵌合させて、抜きかしめることにより固着一体化してコア片ブロック３３を形成する。次いで、図１７に示すように各コア片ブロック３３の端面３１ｃが形成された側同士が重なるように噛み合わせ、ピン穴３１ｂに連結ピン３４を貫通させることにより連結一体化してコア部材３２を形成する。次いで、図１８に示すように所定のコア片ブロック３３の位置決め用切り欠き３１ａに二次巻線１５を巻回する。そして、各コア片ブロック３３を連結ピン３４を中心として回動させて屈曲し、環状とすることによりコア３５を形成する。最後に、コア部材３２の両端のピン穴３１ｂ同士にも連結ピン３４を貫通させて環状を拘束することにより変成器が完成する。
【００３２】
このように上記実施の形態３によれば、上記実施の形態１におけると同様に、所定の幅を有する帯状部材１２の幅方向両側面の対称位置に、位置決め用切り欠き３１ａを形成し、この位置決め用切り欠き３１ａを基準にして、帯状部材１２を長手方向に分割してコア片３１を形成するようにしているので、切り落とされて廃材となる部分を大幅に少なく抑えることができるため、材料の歩留りを向上させることができ、コストの低減を図ることが可能になる。
【００３３】
又、位置決め用切り欠き３１ａを二次巻線１５の巻回高さと等しい長さＬに形成しているので、二次巻線１５の巻回が容易となり組立作業性の向上を図ることが可能になる。
又、位置決め用切り欠き３１ａの深さＤを、ｄ／２≦Ｄ＜ｄの範囲の寸法で形成するようにしているので、磁路への影響を最小限に抑えて組立作業性の向上を図ることが可能になる。
又、抜きかしめのための凹、凸部３１ｅ、３１ｆを、位置決め用切り欠き３１ａの近傍に配置しているので、コア片３１を積層する際のずれを抑えることができ、組立精度を上げて信頼性の向上を図ることが可能になる。
【００３４】
又、位置決め用切り欠き３１ａを全てのコア片３１に形成し、同一の形状としているので、金型を簡素化することができ、さらにコストの低減を図ることが可能になる。
なお、上記構成では位置決め用切り欠き３１ａを、上記実施の形態１における位置決め用切り欠き１１ａと同様の形状とした場合について説明したが、上記実施の形態２における位置決め用切り欠き２１ａと同様に、一対ずつ短尺に形成しても上記と同様の効果を発揮することができる。
【００３５】
【発明の効果】
以上のように、この発明の請求項１によれば、所定の幅を有する帯状部材を長手方向に分割して形成される複数のコア片を積層して一体化し、屈曲可能な連結部を介して順次連結することにより形成されたコア部材の連結部を屈曲させることにより環状に形成されたコア、およびコア片に巻回された二次巻線とを備え、二次巻線が巻回されたコア片の幅方向両側面の対称位置に位置決め用切り欠きが形成され、二次巻線は位置決め用切り欠きにより巻回位置が規制されているので、材料の歩留りを向上させてコストの低減を図ることが可能な変成器を提供することができる。
【００３６】
又、この発明の請求項２によれば、請求項１において、位置決め用切り欠きは、コア片の連結方向に二次巻線の巻回高さと等しい長さに形成されているので、二次巻線の巻回が容易となり組立作業性の向上を図ることが可能な変成器を提供することができる。
【００３７】
又、この発明の請求項３によれば、請求項２において、位置決め用切り欠きの深さは、下記式
ｄ／２≦Ｄ＜ｄ
但し、　Ｄ：位置決め用切り欠きの深さ
ｄ：二次巻線の線径
に基づく寸法に形成されているので、磁路への影響を最小限に抑えて組立作業性の向上を図ることが可能な変成器を提供することができる。
【００３８】
又、この発明の請求項４によれば、請求項１において、位置決め用切り欠きは、コア片の連結方向に二次巻線の巻回高さと等しい間隔を介し、短尺長さで且つ一対ずつ位置決め部材が係合可能に形成されているので、二次巻線の巻回が容易となり組立作業性の向上を図ることが可能な変成器を提供することができる。
【００３９】
又、この発明の請求項５によれば、請求項１ないし４のいずれかにおいて、コア片を積層して一体化する手段は、位置決め用切り欠きの近傍に配置されているので、組立精度を上げて信頼性の向上を図ることが可能な変成器を提供することができる。
【００４０】
又、この発明の請求項６によれば、請求項１ないし５のいずれかにおいて、位置決め用切り欠きは、各コア片で同じ形状に形成されているので、金型を簡素化してさらにコストの低減を図ることが可能な変成器を提供することができる。
【００４１】
又、この発明の請求項７によれば、所定の幅を有する帯状部材の幅方向両側面の対称位置に位置決め用切り欠きを形成する工程と、帯状部材を長手方向に分割してコア片を形成し連結部を介して連結するとともに所定の枚数積層し位置決め用切り欠きを基準に一体化してコア部材を形成する工程と、コア片に位置決め用切り欠きにより位置を規制して二次巻線を巻回する工程と、連結部を屈曲させることによりコアを環状に形成する工程とを包含したので、材料の歩留りを向上させてコストの低減を図ることが可能な変成器の製造方法を提供することができる。
【００４２】
又、この発明の請求項８によれば、所定の幅を有する帯状部材の幅方向両側面の対称位置に位置決め用切り欠きを形成する工程と、帯状部材を長手方向に分割してコア片を形成し所定の枚数積層し位置決め用切り欠きを基準に一体化する工程と、積層して一体化されたコア片を連結部を介して連結することによりコア部材を形成する工程と、コア片に位置決め用切り欠きにより位置を規制して二次巻線を巻回する工程と、連結部を屈曲させることによりコアを環状に形成する工程とを包含したので、材料の歩留りを向上させてコストの低減を図ることが可能な変成器の製造方法を提供することができる。
【図面の簡単な説明】
【図１】この発明の実施の形態１における変成器の構成を示す正面図である。
【図２】図１における変成器のコア部材の構成を示す平面図である。
【図３】図２におけるコア部材の要部の構成を示す平面図である。
【図４】図１における変成器のかしめ部の構成を示す断面図である。
【図５】図２におけるコア部材に二次巻線を巻回した状態を示す一部断面平面図である。
【図６】図２におけるコア部材の製造工程を示す斜視図である。
【図７】図１における変成器のかしめ部の図４とは異なる構成を示す断面図である。
【図８】この発明の実施の形態２における変成器の構成を一部を断面にして示す正面図である。
【図９】図８における変成器のコアを形成するコア部材の構成を示す平面図である。
【図１０】図９におけるコア部材に二次巻線を巻回した状態を一部を断面にして示す平面図である。
【図１１】この発明の実施の形態３における変成器の構成を示す正面図である。
【図１２】図１１における変成器のコア部材の構成を示す平面図である。
【図１３】図１２におけるコア部材の要部の構成を示す平面図である。
【図１４】図１３におけるコア部材の要部の構成を示す側面図である。
【図１５】図１３における線ＸＶ−ＸＶに沿った断面を示す断面図である。
【図１６】図１３におけるコア部材の要部を展開して示す平面図である。
【図１７】図１２におけるコア部材の組立方法を示し、（Ａ）は平面図、（Ｂ）は側断面図である。
【図１８】図１２におけるコア部材に二次巻線を巻回した状態を示す一部断面平面図である。
【図１９】従来の変成器の構成を示す平面図である。
【図２０】図１９における変成器の製造工程を示す平面図である。
【符号の説明】
１１，２１，３１　コア片、１１ａ，２１ａ，３１ａ　位置決め用切り欠き、
１１ｂ，２１ｂ，３１ｅ　凹部、１１ｃ，２１ｃ，３１ｆ　凸部、
１２　帯状部材、１３　薄肉部、１４，２３，３２　コア部材、
１５　二次巻線、１６，２５，３５　コア、３３　コア片ブロック、
３４　連結ピン。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a configuration of a transformer incorporated in a circuit breaker for detecting a current flowing through a primary conductor and a method of manufacturing the same.
[0002]
[Prior art]
FIG. 19 is a plan view showing a configuration of a conventional transformer disclosed in Japanese Patent Application Laid-Open No. 2000-91145, for example, and FIG. 20 is a plan view showing a manufacturing process of the transformer in FIG.
In the figure, reference numeral 1 denotes a yoke piece made of a magnetic material as shown in FIG. 20 (A), in which a concave portion 1a and a convex portion 1b as a connecting portion are formed on the back surface on one end side, and the end surface 1c has An end face 1d is formed in an arc shape centered on the centers of the protrusions 1a and 1b, and an end face 1d that can be fitted to the end face 1c of the adjacent yoke piece 1 is formed on the other end side. Reference numeral 2 denotes a first core member in which a plurality of yoke pieces 1 are arranged via respective end faces 1c and 1d.
[0003]
Reference numeral 3 denotes a second core member in which the yoke pieces 1 are alternately arranged in the longitudinal direction with respect to the first core member 2 as shown in FIG. 20 (A), and as shown in FIG. Are alternately laminated with the core member 2 and integrated by crimping. Although not shown, the concave portions 1a and the convex portions 1b of the core pieces 1 adjacent to each other in the laminating direction are rotatably connected by being fitted together, and constitute the core 4 together with the first core member 2. ing. Reference numeral 5 denotes an insulating bobbin in which the core 4 is inserted through the inside, 6 denotes a secondary winding wound around the insulating bobbin 5, 7 denotes a concave and convex portion 1a after the secondary winding 6 is wound. This transformer is formed by bending the core 4 by rotating the fitting portion 1b to form an annular shape.
[0004]
[Problems to be solved by the invention]
The conventional transformer is configured as described above, and the first and second core members 2 and 3 are punched from a plate-like member by a mold (not shown) in an arrangement as shown in FIG. Since the core 4 is formed by alternately stacking and integrating as shown in FIG. 20B, a space is provided between the first and second core members 2 and 3 as is apparent from the drawing. Further, although not shown, a space for drilling a pilot hole or the like serving as a reference for positioning at the time of swaging is required, so that there is a problem that the material yield is poor and the cost is increased. .
[0005]
The present invention has been made in order to solve the above-described problems, and an object of the present invention is to provide a transformer capable of improving the yield of materials and reducing costs, and a method of manufacturing the transformer. It is.
[0006]
[Means for Solving the Problems]
A transformer according to claim 1 of the present invention is configured such that a plurality of core pieces formed by dividing a belt-shaped member having a predetermined width in the longitudinal direction are laminated and integrated, and sequentially connected via a bendable connection portion. A core piece having a core formed in an annular shape by bending a connecting portion of a core member formed by performing the above, and a secondary winding wound on the core piece, Positioning notches are formed at symmetrical positions on both side surfaces in the width direction, and the winding position of the secondary winding is regulated by the positioning notches.
[0007]
In the transformer according to a second aspect of the present invention, in the first aspect, the positioning notch is formed to have a length equal to a winding height of the secondary winding in a connecting direction of the core pieces. is there.
[0008]
In the transformer according to a third aspect of the present invention, in the second aspect, the depth of the positioning notch is formed to have a dimension based on the following equation.
d / 2 ≦ D <d
Here, D: depth of positioning notch d: wire diameter of secondary winding
In the transformer according to a fourth aspect of the present invention, in the first aspect, the positioning notch has a short length through an interval equal to a winding height of the secondary winding in a connecting direction of the core pieces. A pair of positioning members are formed so as to be engageable.
[0010]
In the transformer according to a fifth aspect of the present invention, in any one of the first to fourth aspects, the means for laminating and integrating the core pieces is disposed near the notch for positioning. .
[0011]
According to a sixth aspect of the present invention, in the transformer according to any one of the first to fifth aspects, the positioning notch is formed in the same shape in each core piece.
[0012]
Further, in the method for manufacturing a transformer according to claim 7 of the present invention, a step of forming positioning notches at symmetrical positions on both side surfaces in the width direction of a band-shaped member having a predetermined width; Forming a core piece, connecting through a connecting portion, laminating a predetermined number of sheets, integrating the core member based on the positioning notch, and regulating the position by the positioning notch on the core piece. And winding the secondary winding, and bending the connecting portion to form a core in an annular shape.
[0013]
In the method for manufacturing a transformer according to claim 8 of the present invention, a step of forming positioning notches at symmetrical positions on both side surfaces in a width direction of a band-shaped member having a predetermined width; Forming a core piece, laminating a predetermined number of pieces, and integrating them based on the positioning notch, and forming a core member by connecting the laminated and integrated core pieces via a connecting portion. And a step of winding the secondary winding while regulating the position of the core piece with the positioning notch, and a step of forming the core in an annular shape by bending the connecting portion.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
1 is a front view showing a configuration of a transformer according to Embodiment 1 of the present invention, FIG. 2 is a plan view showing a configuration of a core member forming a core of the transformer in FIG. 1, and FIG. 3 is a core member in FIG. FIG. 4 is a cross-sectional view showing the configuration of the caulked portion of the transformer in FIG. 1, and FIG. 5 is a partial view showing a state in which a secondary winding is wound around a core member in FIG. FIG. 6 is a perspective view showing a manufacturing process of the core member in FIG. 2, and FIG. 7 is a sectional view showing a configuration different from FIG. 4 of a caulking portion of the transformer in FIG.
[0015]
In the drawing, reference numeral 11 denotes a core piece formed by dividing a belt-shaped member 12 having a predetermined width in the longitudinal direction (divided into four in the drawing), and connected by a thin portion 13 as a connecting portion. Positioning notches 11a are formed at symmetrical positions on both side surfaces of the core piece 11 in the width direction. As shown in FIG. 3, the positioning notch 11a has a length L equal to a winding height of a secondary winding described later in the connection direction, and a depth D is a wire diameter of the secondary winding. , D / 2 ≦ D <d, and a concave portion 11b and a convex portion 11c that can be fitted are formed on the back surface near the positioning notch 11a.
[0016]
As shown in FIG. 4, a predetermined number 14 (seven in the drawing) of the core pieces 11 connected via the thin portion 13 is laminated, and the concave and convex portions 11b and 11c adjacent to each other in the laminating direction are fitted together. A core member 15, which is formed by being fixed and integrated by being pulled together, is a secondary winding wound around a predetermined core piece 11 of the core member 14, and is wound by a positioning notch 11a. Is regulated. Reference numeral 16 denotes a core formed in an annular shape by bending the thin portion 13 of the core member 14 around which the secondary winding 15 is wound. The contacted ends of the core member 14 are fixed to each other by, for example, welding. By doing so, a transformer is configured.
[0017]
Next, a method of manufacturing the transformer according to the first embodiment configured as described above will be described with reference to the drawings.
First, as shown in FIG. 6, positioning notches 11a are formed at symmetrical positions on both side surfaces in the width direction of the belt-shaped member 12 having a predetermined width. Next, the band-shaped member 12 is divided into four in the longitudinal direction to form the core pieces 11 connected via the thin-walled portions 13. At this time, concave and convex portions 11b and 11c are simultaneously formed on the back surface of the core piece 11 where the positioning notch 11a is formed.
[0018]
Next, the four core pieces 11 formed as described above are sequentially laminated, and the concave and convex portions 11b and 11c adjacent to each other in the laminating direction are fitted together and pulled together to fix and integrate the core. The member 14 is formed. Next, as shown in FIG. 5, the secondary winding 15 is wound around the positioning notch 11a. Thereafter, the core 16 is formed by bending the thin portion 13 to make the core member 14 annular, and the abutted ends are fixed to each other by welding or the like, thereby completing the transformer.
It is needless to say that the formation of the core pieces 11, the concave portions, the convex portions 11b, 11c, and the like in the above steps is performed with the positioning notch 11a as a reference.
[0019]
As described above, according to the first embodiment, positioning notches 11a are formed at symmetrical positions on both side surfaces in the width direction of the band-shaped member 12 having a predetermined width, and based on the positioning notches 11a, Since the band-shaped member 12 is divided in the longitudinal direction to form the core piece 11, the portion that is cut off and becomes waste material can be greatly reduced, so that the material yield can be improved and the cost can be improved. Can be reduced.
[0020]
Further, since the positioning notch 11a is formed to have a length L equal to the winding height of the secondary winding 15, the winding of the secondary winding 15 is facilitated, and the assembling workability can be improved. become.
In addition, since the depth D of the positioning notch 11a is formed to have a dimension in the range of d / 2 ≦ D <d, the influence on the magnetic path is minimized and the improvement of the assembling workability is improved. It becomes possible to plan.
Further, since the concave and convex portions 11b and 11c for punching and caulking are arranged in the vicinity of the positioning notch 11a, it is possible to suppress the displacement when the core pieces 11 are stacked, and to increase the assembly accuracy. It is possible to improve the reliability.
[0021]
In the above configuration, the case where the positioning notch 11a is formed only in the core piece 11 around which the secondary winding 15 is wound has been described, but the positioning notch 11a is also formed in the remaining core piece 11. The positioning notch 11a of each core piece 11 may have the same shape, so that the mold can be simplified and the cost can be further reduced.
Further, in the above configuration, as a means for laminating and integrating the core pieces 11, the case where the concave and convex parts 11 b and 11 c fitted to each other are used has been described. However, as shown in FIG. Holes 11d may be formed on the basis of the positioning notches 11a, and the caulking pins 17 may be passed through these holes 11d to be fixed and integrated. In the case where the caulking is performed as shown in FIG. Since the positional accuracy of the hole 11d can be loosened as compared with the case described above, the processing can be facilitated and the cost can be further reduced.
[0022]
Embodiment 2 FIG.
FIG. 8 is a front view partially showing a structure of a transformer according to Embodiment 2 of the present invention, FIG. 9 is a plan view showing a structure of a core member forming a core of the transformer in FIG. FIG. 10 is a plan view partially showing a state in which a secondary winding is wound around a core member in FIG. 9.
In the figure, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0023]
Reference numeral 21 denotes a core piece formed by dividing the belt-shaped member 12 having a predetermined width in the longitudinal direction (divided into four in the drawing), and is connected via a thin portion 22 as a connecting portion. And, the symmetrical position of the both widthwise side surfaces, through the winding height and equal distance L ₁ of the connecting direction to the secondary winding 15, and the positioning notches 21a of the short respectively in pairs are formed, these A concave portion 21b and a convex portion 21c that can be fitted are formed on the back surface near each positioning notch 21a.
[0024]
23 is formed by laminating a predetermined number of core pieces 21 connected via the thin portion 22 and fixing and integrating the concave and convex portions 21b and 21c which are adjacent to each other in the laminating direction by fitting and crimping. The core member 24 is a plate-shaped positioning member that can be engaged with each of the positioning notches 21a, and is engaged with each of the positioning notches 21a when the secondary winding 15 is wound. The winding position of the wire 15 is regulated. Reference numeral 25 denotes a core formed in an annular shape by bending the thin portion 22 of the core member 23 around which the secondary winding 15 is wound. The contacted ends of the core member 23 are welded, for example, by welding or the like. The transformer is formed by fixing the transformer.
[0025]
According to the second embodiment, the symmetrical position of the both widthwise side surfaces of the core pieces 21, via the winding height and equal distance L ₁ of the secondary winding 15 in the connecting direction, the pair by short Since the positioning notch 21a is formed and the winding position of the secondary winding 15 is regulated by the positioning member 24 which engages with each of the positioning notches 21a, the positioning notch 21a is short. As a result, the yield of the material can be further improved, and the influence on the magnetic path can be minimized. In addition, the use of the positioning member 24 facilitates the winding of the secondary winding 15. In addition, it is possible to improve the assembly workability.
[0026]
In the above configuration, the case where the positioning notch 21a is formed only in the core piece 21 around which the secondary winding 15 is wound has been described, but the remaining core piece 21 is formed in the same manner as in the first embodiment. The positioning notches 21a may be formed on the core pieces 21. By making the positioning notches 21a of each core piece 21 have the same shape, the mold can be simplified, and the cost can be further reduced. Becomes possible.
In addition, since the concave and convex portions 21b and 21c for punching and caulking are arranged near the positioning notch 21a, it is possible to suppress displacement when the core pieces 21 are stacked, and to increase assembly accuracy. It is possible to improve the reliability.
[0027]
Embodiment 3 FIG.
FIG. 11 is a front view showing a configuration of a transformer according to Embodiment 3 of the present invention, FIG. 12 is a plan view showing a configuration of a core member of the transformer in FIG. 11, and FIG. 13 is a side view showing a configuration of a main part of the core member in FIG. 13, FIG. 15 is a cross-sectional view showing a cross section taken along line XV-XV in FIG. 13, and FIG. 16 is a core view in FIG. FIG. 17 shows a method of assembling the core member in FIG. 12 in which main parts of the member are developed. FIG. 17A is a plan view, FIG. FIG. 4 is a partial cross-sectional plan view showing a state where a secondary winding is wound.
[0028]
In the figure, the same parts as those in the first and second embodiments are denoted by the same reference numerals, and the description is omitted. Reference numeral 31 denotes a core piece formed by dividing the band-shaped member 12 having a predetermined width in the longitudinal direction. As shown in FIG. When the length L is equal to the winding height of the secondary winding 15 and the depth D is the wire diameter of the secondary winding 15, the notch for positioning has a dimension in the range of d / 2 ≦ D <d. 31a are formed. A pin hole 31b through which a connecting pin described later is penetrated is formed on one end side, and an end face 31c is formed in an arc shape centered on the center of the pin hole 31b, and is adjacent to the other end side. An end surface 31d that can be fitted to the end surface 31c of the yoke piece 31 is formed. On the back surface near the positioning notch 31a, a recess 31e and a projection 31f that can be fitted are formed respectively.
[0029]
Reference numeral 32 denotes a core member, in which core pieces 31 are arranged so that both end faces 31c and 31d are alternately arranged in the longitudinal direction as shown in FIG. 16 and laminated as shown in FIG. 14 and laminated as shown in FIG. The concave and convex portions 31e and 31f that are adjacent to each other in the direction are fitted and pulled together and fixedly integrated to form the core piece block 33, and the pin holes 31b at both ends of the core piece block 33 are connected as connecting means. Are connected and integrated by penetrating the connecting pin 34 of FIG. Numeral 35 denotes a core formed by bending the core member 32 around which the secondary winding 15 is wound as shown in FIG. 18 by rotating each core piece block 33 about the connection pin 34 as a ring. In addition, a transformer is constituted by penetrating the connecting pin 34 between the pin holes 31b at both ends of the core member 32 and restraining the annular shape.
[0030]
Next, a method of manufacturing the transformer according to the third embodiment configured as described above will be described with reference to the drawings.
First, although not shown, positioning notches 31a are sequentially formed at predetermined positions in the longitudinal direction at symmetrical positions on both widthwise side surfaces of the band-shaped member 12 having a predetermined width. Next, the belt-shaped member 12 is divided into predetermined lengths based on the positioning notches 31a to form the core pieces 31. At this time, the concave and convex portions 31e and 31f are simultaneously formed on the back surface of the core piece 31 near the positioning notch 31a.
[0031]
Next, the core pieces 31 formed as described above are arranged so that both end faces 31c and 31d are alternately arranged in the longitudinal direction as shown in FIG. 16, and stacked in this order as shown in FIG. The concave and convex portions 31e and 31f adjacent to each other in the laminating direction are fitted to each other, and are firmly integrated by being pulled out to form the core piece block 33. Next, as shown in FIG. 17, the sides on which the end faces 31c of the core piece blocks 33 are formed are engaged with each other so as to overlap with each other, and the connecting pins 34 are passed through the pin holes 31b to be connected and integrated to form the core member 32. I do. Next, as shown in FIG. 18, the secondary winding 15 is wound around the positioning notch 31a of the predetermined core piece block 33. Then, each core piece block 33 is rotated around the connecting pin 34 and bent to form an annular shape, thereby forming the core 35. Finally, the transformer is completed by penetrating the connecting pin 34 between the pin holes 31b at both ends of the core member 32 to restrain the ring.
[0032]
As described above, according to the third embodiment, similarly to the first embodiment, the positioning notches 31a are formed at symmetrical positions on both side surfaces in the width direction of the band-shaped member 12 having the predetermined width. Since the band-shaped member 12 is divided in the longitudinal direction to form the core piece 31 with reference to the positioning notch 31a, a portion that is cut off and becomes waste material can be significantly reduced. Yield can be improved, and costs can be reduced.
[0033]
Further, since the positioning notch 31a is formed to have a length L equal to the winding height of the secondary winding 15, the winding of the secondary winding 15 is facilitated, and the assembling workability can be improved. become.
Further, since the depth D of the positioning notch 31a is formed to have a dimension in the range of d / 2 ≦ D <d, the influence on the magnetic path is minimized, and the improvement of the assembling workability is improved. It becomes possible to plan.
Further, since the concave and convex portions 31e and 31f for punching and caulking are arranged near the positioning notch 31a, it is possible to suppress the displacement when laminating the core pieces 31 and increase the assembly accuracy. It is possible to improve the reliability.
[0034]
Further, since the positioning notches 31a are formed in all the core pieces 31 and have the same shape, the mold can be simplified, and the cost can be further reduced.
In the above configuration, the case where the positioning notch 31a has the same shape as the positioning notch 11a in the first embodiment has been described. However, similar to the positioning notch 21a in the second embodiment, The same effect as described above can be exerted even if the pair is formed short.
[0035]
【The invention's effect】
As described above, according to the first aspect of the present invention, a plurality of core pieces formed by dividing a belt-shaped member having a predetermined width in the longitudinal direction are laminated and integrated, and are connected via a bendable connecting portion. A core formed in an annular shape by bending a connecting portion of a core member formed by sequentially connecting the core member, and a secondary winding wound on a core piece, and the secondary winding is wound. Notches for positioning are formed at symmetrical positions on both sides in the width direction of the core piece, and the winding position of the secondary winding is regulated by the notches for positioning, thus improving material yield and reducing costs. It is possible to provide a transformer capable of achieving the following.
[0036]
According to the second aspect of the present invention, in the first aspect, the positioning notch is formed to have a length equal to the winding height of the secondary winding in the connecting direction of the core pieces. It is possible to provide a transformer in which winding of the winding is facilitated and the assembling workability can be improved.
[0037]
According to a third aspect of the present invention, in the second aspect, the depth of the positioning notch is determined by the following equation: d / 2 ≦ D <d
However, D: depth of positioning notch d: dimension formed based on the wire diameter of the secondary winding, it is possible to minimize the influence on the magnetic path and to improve the assembly workability. A possible transformer can be provided.
[0038]
According to a fourth aspect of the present invention, in the first aspect, the positioning notch is provided in a short length and in pairs at intervals equal to the winding height of the secondary winding in the connecting direction of the core pieces. Since the positioning member is formed so as to be engageable, it is possible to provide a transformer capable of easily winding the secondary winding and improving the assembling workability.
[0039]
According to the fifth aspect of the present invention, in any one of the first to fourth aspects, the means for laminating and integrating the core pieces is disposed near the positioning notch, so that the assembling accuracy can be reduced. It is possible to provide a transformer capable of increasing the reliability of the transformer.
[0040]
According to the sixth aspect of the present invention, in any one of the first to fifth aspects, the positioning notch is formed in the same shape in each core piece, so that the mold is simplified and the cost is further reduced. It is possible to provide a transformer capable of achieving reduction.
[0041]
According to claim 7 of the present invention, a step of forming positioning notches at symmetrical positions on both side surfaces in the width direction of the band-shaped member having a predetermined width, and dividing the band-shaped member in the longitudinal direction to form a core piece. Forming and connecting via a connecting portion, laminating a predetermined number of sheets, integrating the core member based on the positioning notch, and controlling the position of the core piece with the positioning notch and secondary winding And a step of forming a core in an annular shape by bending the connecting portion, thereby providing a method of manufacturing a transformer capable of improving the material yield and reducing the cost. can do.
[0042]
According to the eighth aspect of the present invention, a step of forming positioning notches at symmetrical positions on both side surfaces in the width direction of a band-shaped member having a predetermined width, and dividing the band-shaped member in a longitudinal direction to form a core piece. A step of forming and laminating a predetermined number of sheets and integrating them based on the positioning notch, a step of forming a core member by connecting the laminated and integrated core pieces through a connecting portion, The method includes a step of winding the secondary winding while regulating the position by the positioning notch, and a step of forming the core in an annular shape by bending the connecting portion, thereby improving the material yield and reducing the cost. It is possible to provide a method for manufacturing a transformer capable of reducing the number of transformers.
[Brief description of the drawings]
FIG. 1 is a front view showing a configuration of a transformer according to Embodiment 1 of the present invention.
FIG. 2 is a plan view showing a configuration of a core member of the transformer in FIG.
FIG. 3 is a plan view showing a configuration of a main part of a core member in FIG. 2;
FIG. 4 is a cross-sectional view showing a configuration of a caulking portion of the transformer shown in FIG.
FIG. 5 is a partial cross-sectional plan view showing a state where a secondary winding is wound around a core member in FIG. 2;
FIG. 6 is a perspective view illustrating a manufacturing process of the core member in FIG. 2;
FIG. 7 is a cross-sectional view showing a configuration different from FIG. 4 of a caulking portion of the transformer in FIG. 1;
FIG. 8 is a front view, partially in section, of a configuration of a transformer according to a second embodiment of the present invention.
FIG. 9 is a plan view showing a configuration of a core member forming a core of the transformer in FIG. 8;
10 is a plan view partially showing a state in which a secondary winding is wound around a core member in FIG. 9;
FIG. 11 is a front view showing a configuration of a transformer according to a third embodiment of the present invention.
FIG. 12 is a plan view showing a configuration of a core member of the transformer in FIG. 11;
FIG. 13 is a plan view showing a configuration of a main part of a core member in FIG.
FIG. 14 is a side view showing a configuration of a main part of the core member in FIG. 13;
FIG. 15 is a sectional view showing a section taken along line XV-XV in FIG. 13;
FIG. 16 is a plan view showing an expanded main part of the core member in FIG.
17A and 17B show a method of assembling the core member in FIG. 12, wherein FIG. 17A is a plan view and FIG.
18 is a partial cross-sectional plan view showing a state where a secondary winding is wound around a core member in FIG.
FIG. 19 is a plan view showing a configuration of a conventional transformer.
FIG. 20 is a plan view showing a step of manufacturing the transformer in FIG. 19;
[Explanation of symbols]
11, 21, 31 core pieces, 11a, 21a, 31a positioning notches,
11b, 21b, 31e concave portion, 11c, 21c, 31f convex portion,
12 band member, 13 thin portion, 14, 23, 32 core member,
15 Secondary winding, 16, 25, 35 core, 33 core piece block,
34 connecting pin.

Claims

A plurality of core pieces formed by dividing a band-shaped member having a predetermined width in the longitudinal direction are laminated and integrated, and the connecting portion of the core member formed by sequentially connecting via a bendable connecting portion. A core formed in an annular shape by bending the core piece, and a secondary winding wound around the core piece, and at a symmetrical position on both widthwise side surfaces of the core piece around which the secondary winding is wound. A transformer, wherein a positioning notch is formed, and a winding position of the secondary winding is regulated by the positioning notch.

2. The transformer according to claim 1, wherein the positioning notch is formed to have a length equal to a winding height of the secondary winding in a connecting direction of the core pieces. 3.

The transformer according to claim 2, wherein the depth of the positioning notch is formed to have a dimension based on the following equation.
d / 2 ≦ D <d
Here, D: depth of positioning notch d: wire diameter of secondary winding

The positioning notch is formed in a short length and a pair of positioning members can be engaged with each other at intervals equal to a winding height of the secondary winding in a connecting direction of the core pieces. The transformer according to claim 1, wherein

The transformer according to any one of claims 1 to 4, wherein the means for stacking and integrating the core pieces is arranged near the positioning notch.

The transformer according to any one of claims 1 to 5, wherein the positioning notch is formed in the same shape in each of the core pieces.

Forming a notch for positioning at symmetrical positions on both side surfaces in the width direction of the band-shaped member having a predetermined width; A step of forming a core member by laminating the number of sheets and integrating the positioning notch as a reference, and a step of winding a secondary winding on the core piece by regulating the position by the positioning notch, Forming the core in an annular shape by bending the connecting portion.

Forming a positioning notch at symmetrical positions on both side surfaces in the width direction of the band-shaped member having a predetermined width; dividing the band-shaped member in the longitudinal direction to form a core piece; A step of integrating the core pieces based on the notch, a step of forming a core member by connecting the laminated and integrated core pieces through a connecting portion, and a position of the core piece by the positioning notch. A method for manufacturing a transformer, comprising: a step of restricting and winding a secondary winding; and a step of forming the core in an annular shape by bending the connecting portion.