JP4031893B2 - Rotating electric machine stator core - Google Patents

Description

しかしながら、上記従来の場合、展開コア６を環状化すると、図１８における実際の直線寸法Ｌａ′が上記設定された寸法Ｌａより僅かに伸び、この結果、実際の半径寸法が、得ようとする半径寸法ｒより僅かに大きくなってしまうという不具合があった。
【０００７】
本発明は上記事情に鑑みてなされたものであり、その目的は、磁極ティースを有する複数の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成され回転電機のステータコアにおいて、半径方向の成形精度が高い回転電機のステータコアを提供するにある。
【０００８】
【課題を解決するための手段】
請求項１の発明は、磁極ティースを有する複数の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成された回転電機のステータコアにおいて、
単位ヨークの個数をｎとし、ステータコアの半径をｒ［mm］とし、前記繋ぎ部の径方向の長さをＨ［mm］としたとき、前記単位ヨークの展開方向の直線長さを、下記式
Ｌ＝２ｒsin（１８０°／ｎ）−Ｈπ／ｎ
で求められる長さＬ［mm］となるように設定したところに特徴を有する。
【０００９】
本発明者において、調査したところによると、展開コアを環状化するときに単位ヨークが僅かに伸びる原因は次のようなことであった。すなわち、展開コアを環状化するときには、繋ぎ部において伸縮が発生し、特にその繋ぎ部外縁での伸びが単位ヨークの伸びとなってあらわれる。この伸びは、繋ぎ部の径方向の長さと、単位ヨークの個数とに関係することが判った。つまり、単位ヨークの個数をｎとし、繋ぎ部の径方向の長さをＨ［mm］としたとき、ほぼＨπ／ｎ［mm］が伸びの長さとなることが判った。ここで、ステータコアの半径をｒ［mm］としたときの、単位ヨークの展開方向の理論的な直線長さは、２ｒsin （１８０°／ｎ）［mm］であり、従って、この理論的な直線長さ２ｒsin （１８０°／ｎ）から上記Ｈπ／ｎを予め差し引いておけば、展開コアを環状化したときに単位ヨークの実際の長さＬｇは、
Ｌｇ＝２ｒsin （１８０°／ｎ）
となり、この結果、環状化されたステータコアは半径寸法ｒに成形されたものとなり、半径方向の成形精度が向上する。
【００１０】
請求項２の発明は、磁極ティースを有する複数の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成された回転電機のステータコアにおいて、
単位ヨークの個数をｎとし、ステータコアの半径をｒ［mm］とし、前記繋ぎ部の径方向の長さをＨ［mm］としたとき、前記単位ヨークの展開方向の円弧長さを、下記式
Ｌ＝２πｒ／ｎ−Ｈπ／ｎ
で求められる長さＬ［mm］となるように設定したところに特徴を有する。
【００１１】
単位ヨークの大きさを指定する場合、上述のように展開コアにおける単位ヨークの展開方向の直線長さで指定するやり方の他に、単位ヨークの展開方向の円弧長さで指定するやり方が考えられる。しかして、ステータコアの半径をｒ［mm］としたとき、上記単位ヨークの円弧長さは理論的には、２πｒ／ｎ［mm］となるが、前述した繋ぎ部での伸びがほぼＨπ／ｎであるから、単位ヨークの展開方向の円弧長さを、２πｒ／ｎ−Ｈπ／ｎ［mm］となるように設定することにより、環状化されたステータコアは半径寸法ｒに成形されたものとなり、半径方向の成形精度が向上する。
【００１２】
請求項３の発明は、磁極ティースを有する少なくとも３個以上の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成された回転電機のステータコアにおいて、
前記単位ヨークの全個数をｎとし、ステータコアの半径をｒ［mm］とし、前記繋ぎ部の径方向の長さをＨ［mm］としたとき、前記単位ヨークのうち両端以外の単位ヨークの展開方向の直線長さを、ほぼ下記式で求められる長さＬ［mm］となるように設定し、
Ｌ＝２ｒsin （３６０°／２ｎ）−Ｈπ／ｎ
前記単位ヨークのうち、両端の単位ヨークの展開方向の長さを、両端以外の単位ヨークの展開方向の長さより所定値短く設定したところに特徴を有する。
展開コアとしては、３個以上の単位ヨークを一体の繋ぎ部を介して連続させる形態とすることが多い。この場合、この展開コアが環状化されると、両端の単位ヨークは繋ぎ部を介さずに接合されることになる。しかるに、各単位ヨークの展開方向の直線的長さを上述のように設定しても、この接合部分での接合精度が悪いと、環状化されたステータコアの半径寸法がずれてくる。特に半径寸法が大きくなる傾向が強い。
【００１３】
展開コアとしては、３個以上の単位ヨークを一体の繋ぎ部を介して連続させる形態とすることが多い。この場合、この展開コアが環状化されると、両端の単位ヨークは繋ぎ部を介さずに接合されることになる。しかるに、各単位ヨークの展開方向の直線的長さを上述のように設定しても、この接合部分での接合精度が悪いと、環状化されたステータコアの半径寸法がずれてくる。特に半径寸法が大きくなる傾向が強い。
【００１４】
しかるに、この請求項３の発明においては、単位ヨークのうち両端以外の単位ヨークの展開方向の直線長さを、
Ｌ＝２ｒsin （３６０°／２ｎ）−Ｈπ／ｎ
となるように設定し、前記単位ヨークのうち、両端の単位ヨークの展開方向の長さを、両端以外の単位ヨークの展開方向の長さより所定値短く設定したから、両端の単位ヨークの接合代を調整することが可能となり、半径寸法を、得ようとする寸法に合致させることができるようになる。
【００１５】
請求項４の発明は、磁極ティースを有する少なくとも３個以上の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成された回転電機のステータコアにおいて、
前記単位ヨークの全個数をｎとし、ステータコアの半径をｒ［mm］とし、前記繋ぎ部の径方向の長さをＨ［mm］としたとき、前記単位ヨークのうち両端以外の単位ヨークの展開方向の円弧長さを、ほぼ下記式で求められる長さＬ［mm］となるように設定し、
Ｌ＝２πｒ／ｎ−Ｈπ／ｎ
前記単位ヨークのうち、両端の単位ヨークの展開方向の長さを、両端以外の単位ヨークの展開方向の長さより所定値短く設定したところに特徴を有する。
【００１６】
この請求項４の発明は、請求項３と同様の考え方によるものであり、単位ヨークのうち両端以外の単位ヨークの展開方向の円弧長さを、
Ｌ＝２πｒ／ｎ−Ｈπ／ｎ
となるように設定し、単位ヨークのうち、両端の単位ヨークの展開方向の長さを、両端以外の単位ヨークの展開方向の長さより所定値短く設定したから、両端の単位ヨークの接合代を調整することが可能となり、半径寸法を、得ようとする寸法に合致させることができるようになる。
【００１７】
請求項５の発明は、 磁極ティース片部を有する複数の単位ヨーク片部を繋ぎ片部にて繋いだ形態の第１の鉄心板と、磁極ティース片部を有する複数の単位ヨーク片部を繋ぎ片部にて繋いだ形態で且つこの単位ヨーク片部の両端部分の形状が第１の鉄心板と異なる第２の鉄心板とを積層することにより、磁極ティースを有する複数の単位ヨークが一体の繋ぎ部を介して連続する展開コアを構成すると共に、
この展開コアを環状化し、その両端部分を嵌合し連結することにより、第１の鉄心板の各単位ヨークの端部分と第２の鉄心板の各単位ヨークの端部分とが周方向にずれる形態とされ、
前記単位ヨークの両端部分の周方向にずれた部分を他の部分より軸方向に薄くなるように形成したところに特徴を有する。
【００１８】
この請求項５の発明においては、単位ヨークの両端部分の周方向にずれた部分を他の部分より軸方向に薄くなるように形成したから、展開コアを環状化し、その両端部分を嵌合し連結する際に、嵌合しやすくなり、成形が容易となる。
【００１９】
請求項６の発明は、前記単位ヨークの個数をｎとしたとき、前記展開コアの単位ヨーク間の開き角度を、（３６０°／ｎ）［ｄｅｇ］より所定値小さくなるように設定したところに特徴を有する。
【００２０】
単位ヨークの個数をｎとしたとき、展開コアの単位ヨーク間の開き角度を（３６０°／ｎ）［ｄｅｇ］とするのが理想的である。すなわち、開き角度が（３６０°／ｎ）［ｄｅｇ］であると、展開コアを環状化したときに隣合う単位ヨーク同士が良好に突き合わせ状態に接触すると考えられるが、実際には、隣合う単位ヨーク同士間には繋ぎ部が存在することにより、単位ヨーク同士は接触しないことが多い。接触しない場合には、ステータコアの剛性が低下すると共に、磁気特性も低下しモータ性能の低下につながる。
【００２１】
しかるに請求項６の発明においては、展開コアの単位ヨーク間の開き角度を、（３６０°／ｎ）［ｄｅｇ］より所定値小さくなるように設定しているから、単位ヨーク同士が接触するようになる。この結果、ステータコアの剛性が強くなると共に、磁気特性も向上する。これにて、モータの振動低下およびモータ特性の向上に寄与できるようになる。
【００２２】
【発明の実施の形態】
以下、本発明の第１の実施例につき図１ないし図１０を参照しながら説明する。まず図２には、回転電機（インナーロータ形）のステータ１１が示されている。このステータ１１は、ステータコア１２の磁極ティース１５ｃに巻線１６を装着して構成されている。このステータコア１２は、半径寸法ｒ［mm］この場合例えば４５mmとなるように形成されている。以下、このステータコア１２について述べる。
【００２３】
図３（ａ）には、第１の鉄心板１３が示され、同図（ｂ）には第２の鉄心板１４が示されている。まず、第１の鉄心板１３について述べると、これは、後述する打ち抜き加工によって鉄心板用素材である鉄心用鋼板から構成されている。この第１の鉄心板１３は、６個の単位ヨーク片部１３ａを繋ぎ片部１３ｂにより繋いだ形態に形成されており、各単位ヨーク片部１３ａは磁極ティース片部１３ｃを有してなる。そして、図４（ａ）に示すように各単位ヨーク片部１３ａの左端１３ａＬ（単位ヨーク片部１３ａ中心部からみて左側の端）は、ほぼ垂直状をなし、右端１３ａＲは左端１３ａＬに対して所定の角度θａ［ｄｅｇ］をなすように傾斜している。この角度θａは、単位ヨーク辺部１３ａがこの場合６個存することから３６０°／６つまり６０°に設定されている。
【００２４】
第２の鉄心板１４も第１の鉄心板１３と同様に打ち抜き加工（後述する）により形成されており、図３の（ｂ）に示すように、６個の単位ヨーク片部１４ａを繋ぎ片部１４ｂにより繋いだ形態に形成されており、各単位ヨーク片部１４ａは磁極ティース片部１４ｃを有してなる。そして、図４（ｂ）に示すように各単位ヨーク片部１４ａの右端１４ａＲは、ほぼ垂直状をなし、左端１４ａＬは右端１４ａＲに対して所定の角度θｂ［ｄｅｇ］をなすように傾斜している。この場合、角度θｂと前記角度θａとは大きさとしては同じ６０°であるが、傾斜方向が異なる。
【００２５】
上述の第１の鉄心板１３及び第２の鉄心板１４が、交互に積層されることにより図５に示すように展開コア１５が構成される。この展開コア１５において、各鉄心板１３及び１４の各単位ヨーク片部１３ａ及び１４ａにより単位ヨーク１５ａが形成され、同様に、繋ぎ片部１３ｂ及び１４ｂにより繋ぎ部１５ｂが形成され、磁極ティース片部１３ｃ及び１４ｃにより磁極ティース１５ｃが形成されている。そして、上記各繋ぎ片部１３ｂ及び１４ｂは積層方向に順次ずれなく重ねられている。
この展開コア１５において、図６に示すように、左端１３ａＬ及び１４ａＬ群が凹凸状となり、また、右端１３ａＲ及び１４ａＲ群も逆の関係で凹凸状（相手側凹に対して凸、相手側凸に対して凹）となっている。
【００２６】
展開コア１５が上述のようにして構成された後、磁極ティース１５ｃに巻線１６（図１参照）を装着し、この展開コア１５を繋ぎ部１５ｂにて屈曲して全体を環状化する（図１にはこの環状化の途中状態が示されている）。この環状化のときには、図６において、各端１３ａＬ及び１４ａＬ群による凹凸と、１３ａＲ及び１４ａＲ群による凹凸とが嵌合する。この嵌合状態を図９（これは図１の矢印Ｂ−Ｂ線断面である）に示す。そして、この図９から判るように、第１の鉄心板１３の端１３ａＲ部分と、第２の鉄心板１４の端１４ａＬ部分とが相対的に周方向（図９で左右方向）にずれ、積層方向からみるとラップしている。
【００２７】
環状化最終状態は既述の図２に示されており、この状態において、展開コア１５の再右側の端１３ａＲ及び１４ａＲ部分（この部分を図５、図１、図２に符号１５Ｒで示す）と、再左側の端１３ａＬ及び１４ａＬ部分（この部分を図５、図７、図２に符号１５Ｌで示す）とにより、積層方向からみて例えばほぼＶ字形の凹状となる連結部溶接用凹部１７が形成される。そして、この端部溶接用凹部１７部分を積層方向に例えばアーク溶接する。
上記展開コア１５の環状化によりステータコア１２が形成されると共にステータ１１が形成される。
【００２８】
なお、上記第１の鉄心板１３及び第２の鉄心板１４の打ち抜き加工について、図７及び図８を参照して述べる。図７（ａ）には打ち抜き加工のためのプレス装置１８の概略構成を側面から見て示しており、同図（ｂ）には同装置１８のポンチ部分での横断平面を示している。このプレス装置１８は、ポンチホルダ１８ａと、これに設けられた種々のポンチ１９ないし３２と、ガイド３３と、ダイ３４とを有して構成されている。上記ポンチ１９ないし３２は適宜のタイミングで選択的に降下されるようになっている。
【００２９】
このプレス装置１８を用いての打ち抜き加工について述べる。第１の鉄心板１３及び第２の鉄心板１４の素材である鉄心用鋼板３５は、図７（ａ）に示すように矢印Ｃで示す方向へ順送りされる。その送りピッチを符号Ｐにて示し、この送りピッチＰについては後述する。そして、同図（ｃ）、（ｄ）及び（ｅ）に示すように、鉄心用鋼板３５に、各鉄心板１３及び１４が連なって交互に形成されるもので、これが２列状態で形成される。このとき、図７における下側の一列を見た場合、図８のようになる。なお、ポンチ３１は空間Ｓ１４′形成用であり、以下、ポンチ３２は空間Ｓ１３形成用、ポンチ３０は空間Ｓ１４形成用、ポンチ２９と３１とで空間Ｓｋ′形成用、ポンチ３０と３２とで空間Ｓｋ形成用となっている。
【００３０】
さて、前述の送りピッチＰは、単位ヨーク１５ａの展開方向の直線長さＬ（図１参照）に相当するものであり、この直線長さＬは、単位ヨーク１５ａの個数をｎ（この場合６個）とし、ステータコアの半径をｒ［mm］（この場合４５mm）とし、前記繋ぎ部の径方向の長さをＨ［mm］（図１０参照）としたとき、下記式
Ｌ＝２ｒsin（１８０°／ｎ）−Ｈπ／ｎ
で求められている。
【００３１】
本発明者において、調査したところによると、展開コア１５を環状化するときに単位ヨーク１５ａが僅かに伸びる原因は次のようなことであった。すなわち、展開コア１５を環状化するときには、繋ぎ部１５ｂにおいて伸縮が発生する。特に、その繋ぎ部１５ｂ（単位ヨーク辺部１３ｂ、１４ｂ）外縁での伸びが単位ヨーク１５ａの伸びとなってあらわれる。つまり、図１０に示したように、繋ぎ部１５ｂを構成する単位ヨーク片部１４ｂ（１３ｂ）をみた場合、その厚みの中心点Ｃ（Ｈ／２の部分）の外側では、環状化のときに、角度θａ分伸びる作用がある。この伸びは、中心点Ｃからの半径が（Ｈ／２）で示されることから、
２π（Ｈ／２）・（θａ／３６０°）
で概略示される。
【００３２】
この場合θａは３６０°／ｎ
であるから、２π（Ｈ／２）・（θａ／３６０°）＝Ｈπ／ｎ
となる。このＨπ／ｎは円弧長さであるが、直線長さに変換しても良い。しかし両者は近似した値を示すので、実質的にこの円弧長さＨπ／ｎで良い。なお、上述の繋ぎ部１５ｂでの伸びは、鉄心板の材料成分特に珪素の含有量が少ないほど大となる方向に変動するものであり、珪素含有量が重量比３〜４％のとき上述の式が好適する。
【００３３】
一方、伸びがないと仮定したとき計算上求められる理論的な直線長さＬａは、図２１に示したように、
Ｌａ＝２ｒsin （１８０°／ｎ）
となる。
【００３４】
従って、この理論的な直線長さ２ｒsin（１８０°／ｎ）から上記Ｈπ／ｎを予め差し引いた値Ｌ
Ｌ＝２ｒsin （１８０°／ｎ）−Ｈπ／ｎ
を設定しておけば、展開コア１５を環状化したときに、繋ぎ部１５ｂにて伸びがあっても単位ヨーク１５ａの実際の長さＬｇ（図２参照）は、
Ｌｇ＝２ｒsin （１８０°／ｎ）
となり（この場合４５ｍｍ）、この結果、環状化されたステータコア１２は半径寸法ｒ（４５ｍｍ）に成形されたものとなり、半径方向の成形精度が向上する。
【００３５】
なお、表１には、実験によって得られたデータを示しており、上記Ｈがほぼ０．６［ｍｍ］であるときにおいて、単位ヨーク１５ａの展開方向の直線長さＬを、各値に定めたときの環状化されたステータコア１２の直径寸法を示している。これから判るように、上記Ｌが４５［ｍｍ］のときには直径寸法が所期寸法（９０ｍｍ）より大きくなるが、Ｌが４４．６〜４４．７［ｍｍ］に定めれば、ほぼ所期の直径寸法を得ることができる。
【００３６】
【表１】

【００３７】
図１１は本発明の第２の実施例を示しており、この実施例においては、次の点が第１の実施例と異なる。すなわち、第１の実施例では、単位ヨーク１５ａの展開方向の直線長さを、
Ｌ＝２ｒsin （１８０°／ｎ）−Ｈπ／ｎ
に設定したが、この第２の実施例においては、展開コア１５における単位ヨーク１５ａの展開方向の長さを、下記式で求められる円弧長さＬｅに設定している。
【００３８】
Ｌｅ＝２πｒ／ｎ−Ｈπ／ｎ［mm］
ここで、単位ヨーク１５ａの円弧長さは理論的には、２πｒ／ｎ［mm］となるが、前述した繋ぎ部１５ｂでの伸びがほぼＨπ／ｎであるから、単位ヨーク１５ａの展開方向の円弧長さＬｅを、２πｒ／ｎ−Ｈπ／ｎ［mm］となるように設定することにより、環状化されたステータコア１２は半径寸法ｒに成形されたものとなり、半径方向の成形精度が向上する。
【００３９】
図１２は本発明の第３の実施例を示しており、この実施例では次の点が第１の実施例と異なる。すなわち、第１の実施例では、単位ヨーク１５ａの全部について、直線長さを既述のＬに設定したが、この第３の実施例では、両端の単位ヨークについては、直線長さを所定値α［mm］短く設定したところに特徴がある。上記所定値αは、この場合０．５mmに設定されている。
【００４０】
このように設定した趣旨は次にある。展開コア１５が環状化されると、両端の単位ヨーク１５ａ、１５ａは繋ぎ部１５ｂを介さずに接合されることになる。しかるに、全ての単位ヨーク１５ａの展開方向の直線的長さを前述のＬに設定しても、この接合部分での接合精度が悪いと、環状化されたステータコア１２の半径寸法がずれてくる。特に半径寸法が大きくなる傾向が強い。
【００４１】
しかるに、この第３の実施例においては、単位ヨーク１５ａのうち両端以外の単位ヨーク１５ａの展開方向の直線長さを、前述の長さＬ
Ｌ＝２ｒsin （３６０°／２ｎ）−Ｈπ／ｎ
に設定し、単位ヨーク１５ａのうち、両端の単位ヨーク１５ａの展開方向の長さを、両端以外の単位ヨーク１５ａの展開方向の直線長さＬより所定値α短く設定したから、両端の単位ヨーク１５ａ，１５ａの接合代を調整することが可能となり、半径寸法を、得ようとする寸法に合致させることができる。
【００４２】
なお、この第３の実施例では、直線長さＬの場合について述べたが、これは、円弧長さＬｅの場合についても同様であり、単位ヨーク１５ａのうち両端以外の単位ヨーク１５ａの展開方向の円弧長さＬｅ［mm］を、
Ｌｅ＝２πｒ／ｎ−Ｈπ／ｎ
となるように設定し、両端の単位ヨーク１５ａ、１５ａの展開方向の長さを、両端以外の単位ヨーク１５ａの展開方向の長さより所定値α短く設定するようにしても良い。
【００４３】
図１３は本発明の第４の実施例を示し、この第４の実施例では、単位ヨーク１５ａの両端部分の周方向にずれた部分（第１の鉄心板１３の左端１３ａＬ部分、第２の鉄心板１４の右端１４ａＲ部分）を他の部分より軸方向に薄くなるように形成したところに特徴を有する。
この第４の実施例においては、単位ヨーク１５ａの両端部分の周方向にずれた部分を他の部分より軸方向に薄くなるように形成したから、展開コア１５を環状化し、その両端部分を嵌合し連結する際に、嵌合しやすくなり、成形が容易となる。
【００４４】
図１４は本発明の第５の実施例を示しており、この実施例においては、第１の鉄心板１３を２枚一組とすると共に、第２の鉄心板１４を２枚一組として、交互に積層し、且つ、その２枚一組の周方向にずれた部分を他の部分より軸方向に薄くなるように形成している。この実施例においても、展開コア１５を環状化し、その両端部分を嵌合し連結する際に、嵌合しやすくなり、成形が容易となる。
【００４５】
図１５ないし図１７は本発明の第６の実施例を示しており、この実施例においては、単位ヨーク１５ａの個数をｎとしたとき、展開コア１５の単位ヨーク１５ａ間の開き角度βを、（３６０°／ｎ）［ｄｅｇ］より所定値この場合βａ小さくなるように設定したところに特徴を有する。この実施例においては、上記ｎは６であり、従って、上記開き角度βは
β＝６０°−βａ
となる。この場合βａは、（３６０°／ｎ）のほぼ５％程度が好ましい。従って、βａはほぼ３°、βはほぼ５７°が好ましい。
【００４６】
上述のようにβ、βａを設定した趣旨は次にある。
すなわち、単位ヨーク１５ａの個数をｎとしたとき、展開コア１５の単位ヨーク１５ａ間の開き角度を（３６０°／ｎ）［ｄｅｇ］とするのが理想的である。すなわち、開き角度が（３６０°／ｎ）［ｄｅｇ］であると、展開コア１５ａを環状化したときに隣合う単位ヨーク１５ａ同士が良好に突き合わせ状態に接触すると考えられるが、実際には、隣合う単位ヨーク１５ａ同士間には繋ぎ部１５ｂが存在することにより、単位ヨーク１５ａ同士は接触しないことが多い。接触しない場合には、ステータコア１２の剛性が低下すると共に、磁気特性も低下しモータ性能の低下につながる。
【００４７】
しかるにこの第６の実施例においては、展開コア１５の単位ヨーク１５ａ間の開き角度βを、（３６０°／ｎ）［ｄｅｇ］より所定値βａ小さくなるように設定しているから、単位ヨーク１５ａ同士が接触するようになる。この結果、ステータコア１２の剛性が強くなると共に、磁気特性も向上する。これにて、モータの振動低下およびモータ特性の向上に寄与できるようになる。
【００４８】
【発明の効果】
本発明は以上の説明から明らかなように、磁極ティースを有する複数の単位ヨークが一体の繋ぎ部を介して連続する展開コアを備え、この展開コアを環状化して構成された回転電機のステータコアにおいて、半径方向の成形精度が高い回転電機のステータコアを提供できる。
【図面の簡単な説明】
【図１】本発明の第１の実施例に関わり、環状化の途中状態を示す展開コアの平面図
【図２】ステータの平面図
【図３】（ａ）は第１の鉄心板の平面図、（ｂ）は第２の鉄心板の平面図
【図４】（ａ）は第１の鉄心板の端部分の平面図、（ｂ）は第２の鉄心板の端部分の平面図
【図５】展開コアの平面図
【図６】図５のＡ−Ａ線断面図
【図７】鉄心板の製造の様子を示す図
【図８】第１の鉄心板の製造の様子を示す図
【図９】図１のＢ−Ｂ線断面図
【図１０】繋ぎ部部分の平面図
【図１１】本発明の第２の実施例を示す図１相当図
【図１２】本発明の第３の実施例を示す図５相当図
【図１３】本発明の第４の実施例を示す図６相当図
【図１４】本発明の第５の実施例を示す図６相当図
【図１５】本発明の第６の実施例を示す第２の鉄心板の繋ぎ部部分の平面図
【図１６】第２の鉄心板を環状化した状態での繋ぎ部部分の平面図
【図１７】展開コアを環状化した状態での繋ぎ部部分の平面図
【図１８】従来例を示す図２相当図
【図１９】図１相当図
【図２０】図３相当図
【図２１】展開方向の直線長さの算出を説明するための図
【符号の説明】
１１はステータ、１２はステータコア、１３は第１の鉄心板、１３ａは単位ヨーク片部、１３ｂは繋ぎ片部、１３ｃは磁極ティース片部、１４は第２の鉄心板、１４ａは単位ヨーク片部、１４ｂは繋ぎ片部、１４ｃは磁極ティース片部、１５は展開コア、１５ａは単位ヨーク、１５ｂは繋ぎ部、１５ｃは磁極ティースを示す。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stator core of a rotating electrical machine formed by annularizing a developed core and connecting both ends thereof.
[0002]
[Problems to be solved by the invention]
A conventional stator 1 of a rotating electrical machine is shown in FIGS. The stator 1 is configured by winding a winding 3 around a stator core 2, and the stator core 2 is configured as follows. That is, first, the first core plate 4 and the second core plate 5 shown in FIGS. 20A and 20B are alternately laminated to form the development core 6 shown in FIG. As shown in FIG. 20A, the first iron core plate 4 is formed in a form in which six unit yoke pieces 4a are connected by connecting pieces 4b, and each unit yoke piece 4a has a magnetic teeth. It has a piece 4c. In this case, the angle is different between the right end portion and the left end portion of each unit yoke piece 4a. Further, as shown in FIG. 20 (b), the second iron core plate 5 has the same configuration, and has a unit yoke piece portion 5a, a connecting piece portion 5b, and a magnetic pole tooth piece portion 5c. The right and left end portions of the yoke piece 5a have different angles.
[0003]
Furthermore, the right end portion of the unit yoke piece portion 4a of the first iron core plate 4 and the right end portion of the unit yoke piece portion 5a of the second iron core plate 5 have different angles (different shapes), and the first iron core plate 4 has a different angle. The left end portion of the unit yoke piece portion 4a and the left end portion of the unit yoke piece portion 5a of the second iron core plate 5 also have different angles (different shapes).
[0004]
Accordingly, when the developed core 6 shown in FIG. 19 is configured by alternately laminating these iron core plates 4 and 5, a unit yoke 6a having magnetic teeth 6c is integrated with the developed core 6 through the connecting portion 6b. It will be formed. The winding core 3 is wound around the magnetic pole teeth 6a of the expanded core 6, and the expanded core 6 is bent at the connecting portion 6b to form an annular shape, and both ends thereof are welded and connected to form the stator core 2. In addition, the stator 1 is configured.
[0005]
  In FIG. 18, when the radial dimension of the stator core 2 is r [mm] and the number of the unit yokes 6a is n, the linear length La (see FIGS. 19 and 20) of each unit yoke 6a in the developing direction is obtained. It is theoretically determined and set as follows.
  That is, as shown in FIG.
  La = 2Lb
  Lb = rsin ((360 ° / n) / 2)
        = Rsin (180 ° / n)
  Therefore, La = 2rsin (180 ° / n)
  However, in the conventional case, when the development core 6 is circularized, the actual linear dimension La ′ in FIG. 18 slightly extends from the set dimension La, and as a result, the actual radial dimension is the radius to be obtained. There was a problem that it was slightly larger than the dimension r.
[0006]
That is, as shown in FIG.

However, in the conventional case, when the development core 6 is circularized, the actual linear dimension La ′ in FIG. 18 slightly extends from the set dimension La, and as a result, the actual radial dimension is the radius to be obtained. There was a problem that it was slightly larger than the dimension r.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a deployment core in which a plurality of unit yokes having magnetic teeth are continuous via an integral connecting portion, and this deployment core is formed into an annular shape. In the stator core of a rotary electric machine, it is providing the stator core of a rotary electric machine with the high shaping precision of radial direction.
[0008]
[Means for Solving the Problems]
  The invention of claim 1 is a stator core of a rotating electrical machine comprising a development core in which a plurality of unit yokes having magnetic pole teeth are continuous via an integral connecting portion, and the development core is formed into an annular shape.
  When the number of unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the linear length of the unit yoke in the deploying direction is expressed by the following formula:
      L = 2rsin(180 ° / n) -Hπ / n
It is characterized in that it is set so as to be the length L [mm] required in (1).
[0009]
  According to an investigation by the present inventor, the reason why the unit yoke slightly extends when the development core is circularized is as follows. That is, when the development core is formed into an annular shape, expansion and contraction occurs at the joint, and in particular, the elongation at the outer edge of the joint appears as the elongation of the unit yoke. This elongation was found to be related to the radial length of the joint and the number of unit yokes. That is, it was found that when the number of unit yokes is n and the length of the connecting portion in the radial direction is H [mm], the length of extension is approximately Hπ / n [mm]. Here, when the radius of the stator core is r [mm], the theoretical linear length in the developing direction of the unit yoke is 2r.sin (180 ° / n) [mm], so this theoretical linear length 2rsin If the above-mentioned Hπ / n is subtracted from (180 ° / n) in advance, the actual length Lg of the unit yoke when the development core is circularized is:
  Lg = 2rsin (180 ° / n)
As a result, the annular stator core is molded into the radial dimension r, and the molding accuracy in the radial direction is improved.
[0010]
The invention of claim 2 is a stator core of a rotating electrical machine comprising a development core in which a plurality of unit yokes having magnetic teeth are continuous via an integral connecting portion, and the development core is formed into an annular shape.
When the number of unit yokes is n, the radius of the stator core is r [mm], and the length of the connecting portion in the radial direction is H [mm], the arc length of the unit yoke in the developing direction is
L = 2πr / n−Hπ / n
It is characterized in that it is set so as to be the length L [mm] required in (1).
[0011]
When specifying the size of the unit yoke, in addition to the method of specifying by the linear length of the unit yoke in the expanding direction as described above, the method of specifying by the arc length of the unit yoke in the expanding direction can be considered. . Thus, when the radius of the stator core is r [mm], the arc length of the unit yoke is theoretically 2πr / n [mm], but the elongation at the connecting portion is almost Hπ / n. Therefore, by setting the arc length in the developing direction of the unit yoke to be 2πr / n−Hπ / n [mm], the annular stator core is formed into the radial dimension r, The molding accuracy in the radial direction is improved.
[0012]
    According to a third aspect of the present invention, there is provided a stator core of a rotating electrical machine including a deployment core in which at least three unit yokes having magnetic teeth are continuous through an integral connecting portion, and the deployment core is formed into an annular shape.
  When the total number of the unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the unit yokes other than both ends of the unit yoke are developed. Set the straight line length in the direction to be approximately the length L [mm] calculated by the following formula,
    L = 2rsin (360 ° / 2n) -Hπ / n
  Among the unit yokes, the length in the deploying direction of the unit yokes at both ends is set to be shorter by a predetermined value than the length in the deploying direction of the unit yokes other than both ends.
  In many cases, the development core has a configuration in which three or more unit yokes are connected via an integral connecting portion. In this case, when the developed core is formed into an annular shape, the unit yokes at both ends are joined without going through the connecting portion. However, even if the linear length of each unit yoke in the developing direction is set as described above, the radial dimension of the annular stator core is shifted if the joining accuracy at this joining portion is poor. In particular, the radial dimension tends to increase.
[0013]
In many cases, the development core has a configuration in which three or more unit yokes are connected via an integral connecting portion. In this case, when the developed core is formed into an annular shape, the unit yokes at both ends are joined without going through the connecting portion. However, even if the linear length of each unit yoke in the developing direction is set as described above, the radial dimension of the annular stator core is shifted if the joining accuracy at this joining portion is poor. In particular, the radial dimension tends to increase.
[0014]
  However, in the invention of claim 3, the linear length in the developing direction of the unit yokes other than both ends of the unit yokes is set as follows:
    L = 2rsin (360 ° / 2n) -Hπ / n
Among the unit yokes, the length of the unit yokes at both ends in the deployment direction is set shorter than the length of the unit yokes other than both ends by a predetermined value. Can be adjusted, and the radial dimension can be matched with the dimension to be obtained.
[0015]
According to a fourth aspect of the present invention, there is provided a stator core of a rotating electrical machine comprising a deployment core in which at least three unit yokes having magnetic teeth are continuous via an integral connecting portion, and the development core is formed into an annular shape.
When the total number of the unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the unit yokes other than both ends of the unit yoke are developed. Set the arc length in the direction to be the length L [mm] calculated by the following formula,
L = 2πr / n−Hπ / n
Among the unit yokes, the length in the deploying direction of the unit yokes at both ends is set to be shorter by a predetermined value than the length in the deploying direction of the unit yokes other than both ends.
[0016]
The invention of claim 4 is based on the same concept as that of claim 3, and the arc length in the developing direction of the unit yokes other than both ends of the unit yokes is defined as follows:
L = 2πr / n−Hπ / n
And the length of the unit yokes at both ends of the unit yoke in the deploying direction is set shorter than the length of the unit yokes other than both ends by a predetermined value. It is possible to adjust and the radius dimension can be matched to the dimension to be obtained.
[0017]
  According to a fifth aspect of the present invention, a plurality of unit yoke pieces having a magnetic tooth piece portion are connected to a first iron core plate in which a plurality of unit yoke piece portions having a magnetic tooth piece portion are connected by a connecting piece portion. A plurality of unit yokes having magnetic teeth are integrated by laminating a second core plate that is different from the first iron core plate in the form of connecting at one part and the both end portions of this unit yoke piece part. While constituting a continuous deployment core through the connecting part,
  By circularizing the developed core and fitting and connecting both end portions thereof, the end portions of the unit yokes of the first iron core plate and the end portions of the unit yokes of the second iron core plate are shifted in the circumferential direction. FormAnd
  The unit yoke is characterized in that a portion shifted in the circumferential direction at both end portions of the unit yoke is formed so as to be thinner in the axial direction than the other portions.
[0018]
In the fifth aspect of the present invention, since the circumferentially shifted portions of both end portions of the unit yoke are formed so as to be thinner in the axial direction than the other portions, the development core is circularized and the both end portions are fitted. When connecting, it becomes easy to fit and molding becomes easy.
[0019]
  The invention of claim 6The unit yokeIt is characterized in that the opening angle between the unit yokes of the development core is set to be smaller than (360 ° / n) [deg] by a predetermined value, where n is the number of.
[0020]
Ideally, the opening angle between the unit yokes of the developed core is (360 ° / n) [deg], where n is the number of unit yokes. That is, when the opening angle is (360 ° / n) [deg], it is considered that the adjacent unit yokes are in good contact with each other when the development core is circularized. In many cases, the unit yokes do not contact each other due to the presence of a connecting portion between the yokes. When not in contact, the rigidity of the stator core is reduced, and the magnetic characteristics are also reduced, leading to a reduction in motor performance.
[0021]
In the invention of claim 6, however, the opening angle between the unit yokes of the development core is set to be smaller than (360 ° / n) [deg] by a predetermined value, so that the unit yokes come into contact with each other. Become. As a result, the rigidity of the stator core is increased and the magnetic characteristics are also improved. Thus, it is possible to contribute to a reduction in motor vibration and an improvement in motor characteristics.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 2 shows a stator 11 of a rotating electric machine (inner rotor type). The stator 11 is configured by mounting a winding 16 on a magnetic pole tooth 15 c of a stator core 12. The stator core 12 is formed to have a radial dimension r [mm], for example, 45 mm in this case. Hereinafter, the stator core 12 will be described.
[0023]
FIG. 3A shows the first iron core plate 13, and FIG. 3B shows the second iron core plate 14. First, the first iron core plate 13 will be described. The first iron core plate 13 is composed of a steel sheet for iron core, which is a material for iron core plates, by punching to be described later. The first iron core plate 13 is formed in a form in which six unit yoke pieces 13a are connected by connecting pieces 13b, and each unit yoke piece 13a has a magnetic tooth piece 13c. As shown in FIG. 4A, the left end 13aL of each unit yoke piece 13a (the left end when viewed from the center of the unit yoke piece 13a) is substantially vertical, and the right end 13aR is in relation to the left end 13aL. It is inclined so as to form a predetermined angle θa [deg]. The angle θa is set to 360 ° / 6, that is, 60 ° because there are six unit yoke side portions 13a in this case.
[0024]
Similarly to the first iron core plate 13, the second iron core plate 14 is formed by punching (described later). As shown in FIG. 3B, the six unit yoke pieces 14a are connected to each other. Each unit yoke piece portion 14a has a magnetic teeth piece portion 14c. As shown in FIG. 4B, the right end 14aR of each unit yoke piece 14a is substantially vertical, and the left end 14aL is inclined to form a predetermined angle θb [deg] with respect to the right end 14aR. Yes. In this case, the angle θb and the angle θa have the same magnitude of 60 °, but the inclination directions are different.
[0025]
The above-described first iron core plate 13 and second iron core plate 14 are alternately laminated to form a deployment core 15 as shown in FIG. In the developed core 15, a unit yoke 15a is formed by the unit yoke pieces 13a and 14a of the iron core plates 13 and 14, and similarly, a connecting portion 15b is formed by the connecting pieces 13b and 14b, and the magnetic teeth piece portion. Magnetic pole teeth 15c are formed by 13c and 14c. And each said connection piece part 13b and 14b is piled up sequentially without shifting in the lamination direction.
In the expanded core 15, as shown in FIG. 6, the left ends 13aL and 14aL groups are concave and convex, and the right ends 13aR and 14aR groups are also concave and convex in a reverse relationship (convex to the counterpart concave, convex to the counterpart It is concave).
[0026]
After the development core 15 is configured as described above, the winding 16 (see FIG. 1) is attached to the magnetic teeth 15c, and the development core 15 is bent at the connecting portion 15b to form an overall shape (FIG. 1 shows the intermediate state of this cyclization). At the time of this circularization, in FIG. 6, the unevenness due to each end 13aL and 14aL group and the unevenness due to 13aR and 14aR group are fitted. This fitting state is shown in FIG. 9 (this is a cross section taken along line BB in FIG. 1). Then, as can be seen from FIG. 9, the end 13aR portion of the first iron core plate 13 and the end 14aL portion of the second iron core plate 14 are relatively displaced in the circumferential direction (left-right direction in FIG. 9). Wrapping from the direction.
[0027]
The final state of the circularization is shown in FIG. 2 described above, and in this state, the ends 13aR and 14aR on the right side of the deployment core 15 (this portion is indicated by reference numeral 15R in FIGS. 5, 1 and 2). And the left end portions 13aL and 14aL (this portion is indicated by reference numeral 15L in FIGS. 5, 7, and 2), the connecting portion welding concave portion 17 is formed into, for example, a substantially V-shaped concave shape when viewed from the stacking direction. It is formed. Then, for example, arc welding is performed on the end welding concave portion 17 in the stacking direction.
The stator core 12 is formed and the stator 11 is formed by forming the developed core 15 into an annular shape.
[0028]
The punching of the first iron core plate 13 and the second iron core plate 14 will be described with reference to FIGS. FIG. 7A shows a schematic configuration of the press device 18 for punching when viewed from the side, and FIG. 7B shows a transverse plane at the punch portion of the device 18. The pressing device 18 includes a punch holder 18a, various punches 19 to 32 provided on the punch holder 18a, a guide 33, and a die 34. The punches 19 to 32 are selectively lowered at an appropriate timing.
[0029]
The punching process using the press device 18 will be described. The steel sheet 35 for the iron core, which is the material of the first iron core plate 13 and the second iron core plate 14, is sequentially fed in the direction indicated by the arrow C as shown in FIG. The feed pitch is indicated by symbol P, and this feed pitch P will be described later. And as shown to the same figure (c), (d), and (e), each iron core board 13 and 14 is formed by turns in the steel plate 35 for iron cores, and this is formed in a 2 row state. The At this time, when the lower row in FIG. 7 is viewed, FIG. 8 is obtained. The punch 31 is used for forming the space S14 ′. Hereinafter, the punch 32 is used for forming the space S13, the punch 30 is used for forming the space S14, the punches 29 and 31 are used for forming the space Sk ′, and the punches 30 and 32 are used as the space. It is for Sk formation.
[0030]
  The above-mentioned feed pitch P corresponds to the linear length L (see FIG. 1) of the unit yoke 15a in the developing direction, and this linear length L indicates the number of unit yokes 15a as n (in this case 6). ), The radius of the stator core is r [mm] (45 mm in this case), and the radial length of the connecting portion is H [mm] (see FIG. 10).
    L = 2rsin(180 ° / n) -Hπ / n
It is demanded by.
[0031]
According to an investigation by the present inventor, the cause of the unit yoke 15a slightly extending when the development core 15 is circularized is as follows. That is, when the development core 15 is circularized, expansion and contraction occurs at the connecting portion 15b. In particular, the elongation at the outer edge of the connecting portion 15b (unit yoke side portions 13b, 14b) appears as the elongation of the unit yoke 15a. That is, as shown in FIG. 10, when the unit yoke piece portion 14b (13b) constituting the connecting portion 15b is viewed, outside the center point C (H / 2 portion) of the thickness, Has an effect of extending the angle θa. This elongation is indicated by (H / 2) as the radius from the center point C.
2π (H / 2) · (θa / 360 °)
Is schematically shown.
[0032]
In this case, θa is 360 ° / n
Therefore, 2π (H / 2) · (θa / 360 °) = Hπ / n
It becomes. This Hπ / n is the arc length, but it may be converted into a linear length. However, since both show approximate values, the arc length Hπ / n may be substantially used. The elongation at the connecting portion 15b changes in a direction that increases as the material component of the iron core plate, in particular, the silicon content decreases, and when the silicon content is 3 to 4% by weight, the elongation is as described above. The formula is preferred.
[0033]
  On the other hand, when it is assumed that there is no elongation, the theoretical straight line length La obtained by calculation is as shown in FIG.
    La = 2rsin (180 ° / n)
It becomes.
[0034]
  Therefore, this theoretical straight line length 2rsinValue L obtained by previously subtracting Hπ / n from (180 ° / n)
  L = 2rsin (180 ° / n) -Hπ / n
Is set, the actual length Lg (see FIG. 2) of the unit yoke 15a when the expanded core 15 is circularized, even if the connecting portion 15b extends.
    Lg = 2rsin (180 ° / n)
(In this case, 45 mm), and as a result, the annular stator core 12 is molded to a radial dimension r (45 mm), and the molding accuracy in the radial direction is improved.
[0035]
Table 1 shows data obtained through experiments. When H is approximately 0.6 [mm], the linear length L in the developing direction of the unit yoke 15a is set to each value. The diameter dimension of the annular stator core 12 is shown. As can be seen from the above, when L is 45 [mm], the diameter is larger than the expected dimension (90 mm). However, when L is set to 44.6 to 44.7 [mm], the diameter is almost the desired diameter. Dimensions can be obtained.
[0036]
[Table 1]

[0037]
  FIG. 11 shows a second embodiment of the present invention. This embodiment differs from the first embodiment in the following points. That is, in the first embodiment, the linear length of the unit yoke 15a in the developing direction is
    L = 2rsin (180 ° / n) -Hπ / n
However, in the second embodiment, the length of the unit yoke 15a in the deployment core 15 in the deployment direction is set to the arc length Le obtained by the following equation.
[0038]
Le = 2πr / n−Hπ / n [mm]
Here, the arc length of the unit yoke 15a is theoretically 2πr / n [mm]. However, since the elongation at the connecting portion 15b is approximately Hπ / n, the unit yoke 15a is expanded in the developing direction. By setting the arc length Le to be 2πr / n−Hπ / n [mm], the annular stator core 12 is formed into the radial dimension r, and the forming accuracy in the radial direction is improved. .
[0039]
FIG. 12 shows a third embodiment of the present invention. This embodiment is different from the first embodiment in the following points. That is, in the first embodiment, the linear length is set to the above-described L for all the unit yokes 15a. However, in this third embodiment, the linear length is set to a predetermined value for the unit yokes at both ends. It is characterized in that α [mm] is set short. The predetermined value α is set to 0.5 mm in this case.
[0040]
The purpose thus set is as follows. When the development core 15 is annularized, the unit yokes 15a and 15a at both ends are joined without using the connecting portion 15b. However, even if the linear lengths in the developing direction of all the unit yokes 15a are set to the above-described L, the radial dimension of the annular stator core 12 is shifted if the joining accuracy at this joined portion is poor. In particular, the radial dimension tends to increase.
[0041]
  However, in the third embodiment, the linear length in the developing direction of the unit yoke 15a other than both ends of the unit yoke 15a is set to the length L described above.
    L = 2rsin (360 ° / 2n) -Hπ / n
In the unit yoke 15a, the length in the deploying direction of the unit yokes 15a at both ends is set shorter than the linear length L in the deploying direction of the unit yokes 15a other than both ends by a predetermined value α. It becomes possible to adjust the joining margin of 15a and 15a, and can make a radial dimension correspond to the dimension to obtain.
[0042]
In the third embodiment, the case of the straight line length L has been described, but the same applies to the case of the arc length Le, and the unit yoke 15a other than the both ends of the unit yoke 15a is expanded. Arc length Le [mm] of
Le = 2πr / n−Hπ / n
The length of the unit yokes 15a, 15a at both ends in the deployment direction may be set to be shorter by a predetermined value α than the length of the unit yokes 15a other than both ends in the deployment direction.
[0043]
FIG. 13 shows a fourth embodiment of the present invention. In this fourth embodiment, the portions of the both ends of the unit yoke 15a that are shifted in the circumferential direction (the left end portion 13aL of the first iron core plate 13, the second portion It is characterized in that the right end 14aR portion of the iron core plate 14) is formed so as to be thinner in the axial direction than the other portions.
In the fourth embodiment, since the portions of the unit yoke 15a that are displaced in the circumferential direction are formed so as to be thinner in the axial direction than the other portions, the development core 15 is annularized and the both end portions are fitted. When connecting and joining, it becomes easy to fit and molding becomes easy.
[0044]
FIG. 14 shows a fifth embodiment of the present invention. In this embodiment, the first iron core plate 13 is a set of two sheets, and the second iron core plate 14 is a set of two sheets. The portions that are alternately stacked and that are displaced in the circumferential direction of the set of two sheets are formed so as to be thinner in the axial direction than the other portions. Also in this embodiment, when the development core 15 is formed into an annular shape and both end portions thereof are fitted and connected, it becomes easy to fit and molding becomes easy.
[0045]
15 to 17 show a sixth embodiment of the present invention. In this embodiment, when the number of unit yokes 15a is n, the opening angle β between the unit yokes 15a of the development core 15 is set as follows. It is characterized in that it is set to be a predetermined value smaller than (360 ° / n) [deg], in this case βa. In this embodiment, n is 6 and therefore the opening angle β is
β = 60 ° −βa
It becomes. In this case, βa is preferably about 5% of (360 ° / n). Accordingly, βa is preferably approximately 3 ° and β is preferably approximately 57 °.
[0046]
The purpose of setting β and βa as described above is as follows.
That is, when the number of unit yokes 15a is n, it is ideal that the opening angle between the unit yokes 15a of the development core 15 is (360 ° / n) [deg]. That is, when the opening angle is (360 ° / n) [deg], it is considered that the adjacent unit yokes 15a are in good contact with each other when the development core 15a is circularized. In many cases, the unit yokes 15a are not in contact with each other because the connecting portion 15b exists between the unit yokes 15a. In the case of no contact, the rigidity of the stator core 12 is reduced and the magnetic characteristics are also reduced, leading to a reduction in motor performance.
[0047]
In the sixth embodiment, however, the opening angle β between the unit yokes 15a of the development core 15 is set to be smaller than (360 ° / n) [deg] by a predetermined value βa. They come into contact with each other. As a result, the rigidity of the stator core 12 is increased and the magnetic characteristics are also improved. Thus, it is possible to contribute to a reduction in motor vibration and an improvement in motor characteristics.
[0048]
【The invention's effect】
As is apparent from the above description, the present invention provides a stator core for a rotating electrical machine having a deployment core in which a plurality of unit yokes having magnetic teeth are continuous via an integral connecting portion, and the deployment core is formed into an annular shape. It is possible to provide a stator core for a rotating electrical machine with high radial precision.
[Brief description of the drawings]
FIG. 1 is a plan view of a development core according to a first embodiment of the present invention, showing an intermediate state of circularization.
FIG. 2 is a plan view of a stator
3A is a plan view of a first iron core plate, and FIG. 3B is a plan view of a second iron core plate.
4A is a plan view of an end portion of a first iron core plate, and FIG. 4B is a plan view of an end portion of a second iron core plate.
FIG. 5 is a plan view of a deployment core
6 is a cross-sectional view taken along line AA in FIG.
FIG. 7 is a view showing a state of manufacturing an iron core plate
FIG. 8 is a diagram showing a state of manufacturing the first iron core plate
9 is a sectional view taken along line BB in FIG.
FIG. 10 is a plan view of a connecting portion.
FIG. 11 is a view corresponding to FIG. 1 showing a second embodiment of the present invention.
FIG. 12 is a view corresponding to FIG. 5 showing a third embodiment of the present invention.
FIG. 13 is a diagram corresponding to FIG. 6 showing a fourth embodiment of the present invention.
FIG. 14 is a diagram corresponding to FIG. 6 showing a fifth embodiment of the present invention.
FIG. 15 is a plan view of a connecting portion of a second iron core plate showing a sixth embodiment of the present invention.
FIG. 16 is a plan view of a joint portion in a state where the second iron core plate is annularized;
FIG. 17 is a plan view of a connecting portion in a state where the development core is annularized;
18 is a view corresponding to FIG. 2 showing a conventional example.
FIG. 19 is equivalent to FIG.
20 is equivalent to FIG.
FIG. 21 is a diagram for explaining the calculation of the straight line length in the development direction.
[Explanation of symbols]
11 is a stator, 12 is a stator core, 13 is a first iron core plate, 13a is a unit yoke piece, 13b is a connecting piece, 13c is a magnetic tooth piece, 14 is a second iron plate, and 14a is a unit yoke piece. , 14b is a connecting piece portion, 14c is a magnetic tooth piece portion, 15 is a developed core, 15a is a unit yoke, 15b is a connecting portion, and 15c is a magnetic pole tooth.

Claims (6)

In a stator core of a rotating electric machine comprising a development core in which a plurality of unit yokes having magnetic pole teeth are continuous via an integral connecting portion, and configured by annularizing the development core,
When the number of unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the linear length of the unit yoke in the deploying direction is expressed by the following formula: L = 2r sin (180 ° / n) −Hπ / n
A stator core for a rotating electrical machine, wherein the stator core is set so as to have a length L [mm] required by the above. In a stator core of a rotating electric machine comprising a development core in which a plurality of unit yokes having magnetic pole teeth are continuous via an integral connecting portion, and configured by annularizing the development core,
When the number of unit yokes is n, the radius of the stator core is r [mm], and the length of the connecting portion in the radial direction is H [mm], the arc length of the unit yoke in the developing direction is L = 2πr / n−Hπ / n
A stator core for a rotating electrical machine, wherein the stator core is set so as to have a length L [mm] required by the above. In a stator core of a rotating electrical machine that includes a deployment core in which at least three unit yokes having magnetic teeth are continuous through an integral connecting portion, and the deployment core is formed into an annular shape.
When the total number of the unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the unit yokes other than both ends of the unit yoke are developed. Set the straight line length in the direction to be approximately the length L [mm] calculated by the following formula,
L = 2r sin (360 ° / 2n) −Hπ / n
A stator core for a rotating electrical machine, wherein, in the unit yoke, the length of the unit yokes at both ends is set shorter than the length of the unit yokes at both ends by a predetermined value. In a stator core of a rotating electrical machine that includes a deployment core in which at least three unit yokes having magnetic teeth are continuous through an integral connecting portion, and the deployment core is formed into an annular shape.
When the total number of the unit yokes is n, the radius of the stator core is r [mm], and the radial length of the connecting portion is H [mm], the unit yokes other than both ends of the unit yoke are developed. Set the arc length in the direction to be the length L [mm] calculated by the following formula,
L = 2πr / n−Hπ / n
A stator core for a rotating electrical machine, wherein, in the unit yoke, the length of the unit yokes at both ends is set shorter than the length of the unit yokes at both ends by a predetermined value. A first iron core plate in which a plurality of unit yoke pieces having magnetic teeth pieces are connected by connecting pieces, and a plurality of unit yoke pieces having magnetic teeth pieces are connected by connecting pieces. In addition, by laminating a second iron core plate having a shape different from the first iron core plate in the both end portions of the unit yoke piece, a plurality of unit yokes having magnetic pole teeth are continued via an integral connecting portion. While configuring the deployment core,
By circularizing the developed core and fitting and connecting both end portions thereof, the end portions of the unit yokes of the first iron core plate and the end portions of the unit yokes of the second iron core plate are shifted in the circumferential direction. is the form,
The stator core for a rotating electrical machine according to any one of claims 1 to 4, wherein portions of the unit yoke that are shifted in the circumferential direction are formed so as to be thinner in the axial direction than other portions. When the number of the unit yoke is n, the opening angle between the unit yokes deployment core claims 1, characterized in that set to a predetermined value smaller than (360 ° / n) [deg ] the stator core of a rotating electrical machine according to any one of 4.

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