JP4566319B2 - Permanent magnet embedded rotor for permanent magnet motor - Google Patents

Permanent magnet embedded rotor for permanent magnet motor Download PDF

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Publication number
JP4566319B2
JP4566319B2 JP2000067525A JP2000067525A JP4566319B2 JP 4566319 B2 JP4566319 B2 JP 4566319B2 JP 2000067525 A JP2000067525 A JP 2000067525A JP 2000067525 A JP2000067525 A JP 2000067525A JP 4566319 B2 JP4566319 B2 JP 4566319B2
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permanent magnet
rotor
embedded
projection piece
positioning
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JP2001258187A (en
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浩樹 松原
義光 大川
裕治 中原
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Description

【０００１】
【発明の属する技術分野】
この発明は、永久磁石型モータで使用される回転子に関し、特に、回転子鉄心の内部に複数個の永久磁石を備えた永久磁石埋め込み型回転子に関する。
【０００２】
【従来の技術】
一般的な永久磁石埋め込み型回転子は、図１０に示されているように、回転軸１０１と、鉄心１０２と、永久磁石１０３によって構成されている。鉄心１０２の中心部には回転軸１０１が嵌入されている。鉄心１０２の外周近傍には永久磁石埋め込み用穴１０４が形成されており、永久磁石埋め込み用穴１０４に永久磁石１０３が埋め込まれている。
【０００３】
永久磁石１０３は、永久磁石埋め込み用穴１０４に収容可能な大きさに形成されている。永久磁石１０３を永久磁石埋め込み用穴１０４に埋め込む際には、永久磁石１０３の表面に接着剤が塗布され、接着剤によって永久磁石埋め込み用穴１０４に永久磁石が接着固定される。永久磁石１０３の固定に接着剤が使用できない場合には、永久磁石１０３は永久磁石埋め込み用穴１０４と隙間なく形成され、永久磁石１０３を永久磁石埋め込み用穴１０４に埋め込む際には、永久磁石１０３を空圧装置等により加圧し、永久磁石埋め込み用穴１０４に強制的に圧入することが行われる。
【０００４】
この他、たとえば、特開平９−３０８１４９号公報に開示されているように、別部品を、磁石端面に圧入し、永久磁石の固定を行う永久磁石埋め込み型回転子が知られている。図１１はその永久磁石埋め込み型回転子を示している。この永久磁石埋め込み型回転子では、鉄心２０２の永久磁石埋め込み用穴２０４に永久磁石２０３を挿入した後、磁石固定部材２０５によって永久磁石２０３を鉄心２０２に固定している。この磁石固定部材２０５による永久磁石２０３の固定は、磁石固定部材２０５に形成されたテーパ状のピン２０６を永久磁石２０３の片側の端面に圧入することにより、永久磁石２０３を押し当て部２０７に押し付けることにより固定している。
【０００５】
また、特開平９−２００９８２号公報に開示されているような永久磁石埋め込み型回転子も知られている。図１２はその永久磁石埋め込み型回転子を示している。この永久磁石埋め込み型回転子では、積層された鉄心３０２の永久磁石埋め込み用穴３０４部分に突起３０７を有する突起付鉄心３０２ａを１枚加えて積層構造の回転子コア３０１を形成し、永久磁石埋め込み用穴３０４における半径方向外側壁面３０５を永久磁石３０３に圧接させるように、少なくとも１枚の鉄心３０２を半径方向内側に変形することで、永久磁石３０３を回転子コア３０１に固定している。
【０００６】
【発明が解決しようとする課題】
上述したような従来の永久磁石埋め込み型回転子では、永久磁石１０３が永久磁石埋め込み用穴１０４に収容可能な大きさに形成されているため、永久磁石の固定位置が一定に定まらず、回転子のアンバランス量が増加するという問題があった。また、永久磁石１０３が、永久磁石埋め込み用穴１０４に埋め込む際に、接着剤が削ぎ取られるなどして接着層の厚さを安定的に確保できず、永久磁石１０３が剥がれる等の信頼性の欠如につながるという問題があった。
【０００７】
接着剤を介さずに永久磁石１０３を永久磁石埋め込み用穴１０４に強制的に圧入するような従来の永久磁石埋め込み型回転子では、永久磁石１０３が焼結物であって脆いために、永久磁石１０３の圧入時に永久磁石埋め込み用穴１０４の壁面との接触により永久磁石１０３に欠けや傷が生じ易い。また、永久磁石１０３の表面に防錆等のためにコーティングが施されている場合には、そのコーティングが剥がれ易い。また、永久磁石１０３と永久磁石埋め込み用穴１０４の寸法上の整合性を得るため、永久磁石１０３の寸法精度の向上が必要であるなどの問題があった。
【０００８】
特開平９−３０８１４９号公報に示されているように従来の永久磁石埋め込み型回転子では、永久磁石２０３は半径方向には固定されないため、実際には接着剤との併用が必要となり、しかも永久磁石２０３の周方向の固定は永久磁石２０３を一方向に押し付けるため、特性ばらつき及びアンバランス量の増加原因となるという問題がある。
【０００９】
また、特開平９−２００９８２号公報に示されているように従来の永久磁石埋め込み型回転子では、永久磁石３０３は周方向には確実に固定されないため、接着剤との併用が必要であり、永久磁石３０３の半径方向の固定は、鉄心３０２で永久磁石３０３を一方向に押し付け、鉄心３０２が変形する事による固定であるが、鉄心３０２を変形させるために加えられた圧力が開放されると、スプリングバックにより、鉄心３０２の変形量が減少し、永久磁石３０３を完全に固定できないという問題がある。
【００１０】
この発明は、上述の問題点を解消するためになされたものであり、回転子のアンバランス量を抑制し、接着剤を使用することなく、永久磁石の欠けや傷、コーティングの剥がれ無しに、永久磁石が安定的に固定される構造の永久磁石モータの永久磁石埋め込み型回転子を得ることを目的としている。
【００１１】
【課題を解決するための手段】
上述の目的を達成するために、この発明による永久磁石埋め込みモータの回転子は、回転子積層鉄心の円周方向に回転子の極数分等間隔に設けられ、鉄心周方向に長く軸方向に貫通する矩形の永久磁石埋め込み用穴を有し、前記永久磁石埋め込み用穴のそれぞれに、磁極面を鉄心径方向とする永久磁石が、隣接するもの同士の磁極の向きが逆になるように装着される永久磁石モータの永久磁石埋め込み型回転子において、前記永久磁石埋め込み用穴の周方向両端部の径方向内側又は外側のいずれかに、周方向外側に傾斜する永久磁石位置決め用突起片が形成され、当該永久磁石位置決め用突起片の、前記永久磁石端部方向への折り曲げによって前記永久磁石が前記回転子積層鉄心に固定されるものである。
【００１２】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石位置決め用突起片の折り曲げ側の根元部分の回転子積層鉄心に切欠け部が形成されているものである。
【００１３】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石位置決め用突起片の周方向の巾をＡとした場合、巾Ａが０．３ｍｍ＜Ａ＜１．５ｍｍの関係になるように形成されているものである。
【００１４】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石位置決め用突起片と永久磁石埋め込み用穴の長辺との角度をθとした場合、９５°＜θ＜１８０°の関係になるように形成されているものである。
【００１５】
つぎの発明による永久磁石埋め込みモータの回転子は、軸方向端部の少なくとも１枚の回転子積層鉄心の永久磁石位置決め用突起片が、永久磁石挿入前に、永久磁石の軸方向端面に重なるように、予め折り曲げられているものである。
【００１６】
つぎの発明による永久磁石埋め込みモータの回転子は、永久磁石埋め込み用穴に永久磁石が挿入されて永久磁石位置決め用突起片の折り曲げが行われた後、軸方向端部の永久磁石がない部分に位置する永久磁石位置決め用突起片が、永久磁石の軸方向端面に重なるように、さらに深く折り曲げられているものである。
【００１７】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石位置決め用突起片は少なくとも永久磁石を固定可能な強度が得られる枚数の回転子積層鉄心にのみに形成されているものである。
【００１８】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石に接着剤が塗布されているものである。
【００１９】
つぎの発明による永久磁石埋め込みモータの回転子は、前記永久磁石がネオジウム系希土類磁石であるものである。
【００２０】
【発明の実施の形態】
以下に添付の図を参照して、この発明にかかる永久磁石モータの永久磁石埋め込み型回転子の実施の形態を詳細に説明する。
【００２１】
実施の形態１．
図１、図２は、この発明による永久磁石埋め込み型回転子の実施の形態１および永久磁石埋め込み型モータを示している。永久磁石埋め込み型モータは、固定子１０と、永久磁石埋め込み型回転子２０と、永久磁石埋め込み型回転子２０を支持する回転軸４０と、軸受部材４１と、外側構造体４２とで構成されている。
【００２２】
固定子１０は、珪素鋼板を所定の形状、たとえば、内周面に３６個のスロット開口部１１を備えた形状に打ち抜いて積層した固定子積層鉄心１２に、三相巻線１３を施されており、リード線１４により電源ユニットに接続されるように構成されている。固定子鉄心１２のスロット開口部１１の個数と極数は、特性を考慮して適宜決定される。
【００２３】
永久磁石埋め込み型回転子２０は、所定の形状に打ち抜かれた珪素鋼板の積層体よりなる回転子積層鉄心２２と、回転子積層鉄心２２に極数分、形成された磁石埋め込み用穴２４に埋め込み装着された極数分の永久磁石２３とで構成される。永久磁石２３はネオジウム系希土類磁石で構成することができる。
【００２４】
図３は、４極の場合の永久磁石埋め込み型回転子２０を示している。永久磁石埋め込み型回転子２０は回転子積層鉄心２２と永久磁石２３とで構成されている。回転子積層鉄心２２は、円周方向に回転子の極数４つ分、等間隔に設けた周方向に長く径方向に短く軸方向に貫通する矩形の磁石埋め込み用穴２４を４個形成され、この磁石埋め込み用穴２４のそれぞれに、磁極面を鉄心径方向とする永久磁石が、隣接するもの同士の磁極の向きが逆になるように装着されている。
【００２５】
永久磁石２３は、永久磁石埋め込み用穴２４に収容可能な大きさに形成されており、磁石埋め込み用穴２４の周方向両端部の径方向内側に、周方向外側に傾斜する永久磁石位置決め用切欠け付き突起片２５が一体成形されている。永久磁石位置決め用切欠け付き突起片２５が容易に折り曲げ可能なように、突起片２５の折り曲げ側の根元部分の回転子積層鉄心には切欠け部２６が形成されている（図４参照）。
【００２６】
永久磁石２３の位置決め固定は、図４に示されているように、永久磁石埋め込み用穴２４に永久磁石２３を嵌め込んだ後に、永久磁石位置決め用切欠け付き突起片２５を工具で永久磁石２３の端面側に折り曲げることにより、接着剤を用いずに行われる。特に、永久磁石位置決め用切欠け付き突起片２５を折り曲げる際、両側を同じように折り曲げれば、永久磁石埋め込み用穴２４の中央および径方向外側に永久磁石２３が固定されるようになり、永久磁石組み付けによる回転子２０のアンバランス量を低減できる。
【００２７】
永久磁石位置決め用切欠け付き突起片２５を折り曲げる場合、当該突起片２５を永久磁石２３に全面が接触するまで折り曲げるのではなく、突起片２５を永久磁石２３に接触させる部分は、図４に示されているように、永久磁石２３の角部分２３ａのみとする。こうすることで、永久磁石２３の大きさにばらつきがある場合でも、スプリングバックによる固定強度の低下が発生せず、安定的に固定強度を得ることができ、また折り曲げ過ぎによる永久磁石２３の破損等を防止できる。
【００２８】
永久磁石位置決め用切欠け付き突起片２５の周方向の巾をＡとした場合、０．３ｍｍ＜Ａ＜１．５ｍｍの関係になるように突起片２５が形成されていることが望ましい。突起片２５の周方向の巾Ａが、０．３ｍｍ以下であると、必要とされる永久磁石２３の固定強度を得ることができず、これに対し、周方向の巾Ａが１．５ｍｍ以であると、突起片２５を折り曲げるために必要となる力が大きくなり、永久磁石２３に傷を付ける原因となる。
【００２９】
根元部分に切欠け部２６を有した永久磁石位置決め用突起片２５と永久磁石埋め込み用穴２４の長辺とがなす角度をθとした場合、９５°＜θ＜１８０°の関係になるように形成されていることが望ましい。角度θが、９５°以下であると、必要な永久磁石２３の固定強度を得ることができず、また折り曲げ過ぎによる永久磁石２３の破損等が問題となる。これに対し、角度θが１８０°以上であると、永久磁石位置決め用切欠け付き突起片２５の変形量が大きくなりすぎ、当該突起片２５の破損が問題となる。
【００３０】
なお、上述の実施の形態では、回転子の外径形状を真円を適用したが、この発明による永久磁石埋め込み型回転子はそれに限らず、如何なる外径形状の永久磁石埋め込み型回転子にも有効である。
【００３１】
なお、上述の実施の形態では、永久磁石位置決め用切欠け付き突起片２５を永久磁石埋め込み用穴２４の径方向内側に形成したが、この発明による永久磁石埋め込み型回転子は、それに限らず、永久磁石位置決め用切欠け付き突起片２５を永久磁石埋め込み用穴２４の径方向外側に形成した永久磁石埋め込み型回転子にも有効である。
【００３２】
また、図５に示されているように、永久磁石２３を永久磁石埋め込み用穴２４に挿入する前に、永久磁石２３が通過できない巾、換言すれば、永久磁石２３の軸方向端面に重なるように、端部の数枚の回転子積層鉄心２２の永久磁石位置決め用切欠け付き突起片２５を予め折り曲げておくことにより、永久磁石２３の軸方向の位置決めが可能となる。
【００３３】
また、図６に示されているように、永久磁石２３を永久磁石埋め込み用穴２４に挿入し、永久磁石位置決め用切欠け付き突起片２５を折り曲げた後、軸方向端部の永久磁石２３が存在しない数枚の回転子積層鉄心２２の永久磁石位置決め用切欠け付き突起片２５を、永久磁石２３の軸方向端面に重なるように、さらに深く折り曲げることにより、永久磁石２３の軸方向の固定を行うことができる。
【００３４】
実施の形態２．
図７、図８は、この発明による永久磁石埋め込み型回転子の実施の形態２を示している。この実施の形態では、上述の実施の形態に加えて、永久磁石位置決め用切欠け付き突起片２５が、すべての回転子積層鉄心２２にではなく、少なくとも永久磁石２３の固定強度が確保できる最小限の回転子積層鉄心２２のみに設けられている。これにより、永久磁石位置決め用切欠け付き突起片２５の折り曲げに必要となる力を軽減でき、折り曲げ設備を安価に得ることが可能となる。
【００３５】
実施の形態３．
図９は、この発明による永久磁石埋め込み型回転子の実施の形態３を示している。この実施の形態では、上述の実施の形態に加えて、永久磁石２３に接着剤２７が塗布され、この永久磁石２３を永久磁石埋め込み用穴２４に埋め込むことにより、永久磁石２３が固定されている。この場合には、永久磁石２３を、さらに強固に固定することが可能となり、また、永久磁石位置決め用切欠け付き突起片２５の折り曲げ後に形成される永久磁石２３と永久磁石位置決め用切欠け付き突起片２５との間に生じる空間２８および永久磁石位置決め用切欠け付き突起片２５の切欠け部２６に接着剤２６が溜まることで、さらに強固に永久磁石２３を固定することが可能となる。
【００３６】
【発明の効果】
以上の説明から理解される如く、この発明による永久磁石埋め込み型回転子によれば、永久磁石位置決め用切欠け付き突起片を折り曲げることにより、接着剤を用いず、永久磁石の欠けや傷、コーティング剥がれを生じることなく、永久磁石の固定が行われ、しかも永久磁石埋め込み用穴の中央および径方向外側又は径方向内側に永久磁石を固定できるから、アンバランス量を低減することができる。また、この発明による永久磁石埋め込み型回転子によれば、新たに部品を設けず、容易に永久磁石を強固に固定でき、アンバランス量も少ないことから、製造が容易で、自動化に適した安価な永久磁石埋め込み型回転子を得ることができる。
【００３７】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石位置決め用突起片の折り曲げ側の根元部分の回転子積層鉄心に切欠け部が形成されているから、永久磁石固定のための永久磁石位置決め用突起片の折り曲げが容易に行われる。
【００３８】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石位置決め用突起片は、周方向の巾Ａが０．３ｍｍ＜Ａ＜１．５ｍｍの関係になるように形成されているから、所要の固定強度を得ることができ、しかも突起片の折り曲げに大きな力が必要でなく、永久磁石に傷を付けることがない。
【００３９】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石位置決め用突起片と永久磁石埋め込み用穴の長辺との角度をθとした場合、９５°＜θ＜１８０°の関係になるように形成されているから、必要な永久磁石の固定強度を得ることができ、しかも永久磁石位置決め用切欠け付き突起片の変形量が大きくなりすぎることがなく、当該突起片の破損が問題となることがない。
【００４０】
つぎの発明による永久磁石埋め込みモータの回転子は、軸方向端部の少なくとも１枚の回転子積層鉄心の永久磁石位置決め用突起片が、永久磁石挿入前に、永久磁石の軸方向端部に重なるように、予め折り曲げられているから、永久磁石の軸方向の位置決めが行われる。
【００４１】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石埋め込み用穴に永久磁石が挿入されて永久磁石位置決め用突起片の折り曲げが行われた後、軸方向端部の永久磁石がない部分に位置する永久磁石位置決め用突起片が、永久磁石の軸方向端部に重なるように、さらに深く折り曲げられているから、永久磁石の軸方向の固定が行われる。
【００４２】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石位置決め用突起片は少なくとも永久磁石を固定可能な強度が得られる枚数の回転子積層鉄心にのみに形成されているから、永久磁石位置決め用切欠け付き突起片の折り曲げに必要となる力を軽減でき、折り曲げ設備を安価に得ることができる。
【００４３】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石に接着剤が塗布されているから、さらに強固な永久磁石の固定強度を得ることができる。
【００４４】
つぎの発明による永久磁石埋め込みモータの回転子によれば、永久磁石がネオジウム系希土類磁石であるから、所要の永久磁石特性が得られる。
【図面の簡単な説明】
【図１】 この発明による永久磁石埋め込み型回転子を組み込んだ永久磁石モータの実施の形態１を示す軸方向断面側面図である。
【図２】 この発明による永久磁石埋め込み型回転子を組み込んだ永久磁石モータの実施の形態１を示す軸に対して垂直方向の断面図である。
【図３】 この発明による永久磁石埋め込み型回転子の実施の形態１を示す正面図である。
【図４】 この発明による永久磁石埋め込み型回転子の実施の形態１を示す永久磁石位置決め用切欠け付き突起部の部分拡大正面図である。
【図５】 この発明による永久磁石埋め込み型回転子の実施の形態１を示す永久磁石位置決め用切欠け付き突起部の部分拡大斜視図である。
【図６】 この発明による永久磁石埋め込み型回転子の実施の形態１を示す永久磁石位置決め用切欠け付き突起部の部分拡大斜視図である。
【図７】 この発明による永久磁石埋め込み型回転子の実施の形態２を示す永久磁石位置決め用切欠け付き突起部の部分拡大正面図である。
【図８】 図７に示したＸ−Ｘ断面図である。
【図９】 この発明による永久磁石埋め込み型回転子の実施の形態３を示す永久磁石位置決め用切欠け付き突起部の部分拡大正面図である。
【図１０】 従来における永久磁石埋め込み型回転子の構造を示す正面図である。
【図１１】 従来における永久磁石埋め込み型回転子の構造を示す正面図である。
【図１２】 従来における永久磁石埋め込み型回転子の構造を示す正面図である。
【符号の説明】
１０ 固定子、１１ スロット開口部、１２ 固定子積層鉄心、１３ 三相巻線、１４ リード線、２０ 永久磁石埋め込み型回転子、２２ 回転子積層鉄心、２３ 永久磁石、２４ 永久磁石埋め込み用穴、２５ 永久磁石位置決め用切欠け付き突起片、２６ 切欠け部、２７ 接着剤。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor used in a permanent magnet type motor, and more particularly to a permanent magnet embedded type rotor having a plurality of permanent magnets inside a rotor core.
[0002]
[Prior art]
As shown in FIG. 10, a general embedded permanent magnet rotor includes a rotating shaft 101, an iron core 102, and a permanent magnet 103. A rotating shaft 101 is fitted in the center of the iron core 102. A permanent magnet embedding hole 104 is formed in the vicinity of the outer periphery of the iron core 102, and the permanent magnet 103 is embedded in the permanent magnet embedding hole 104.
[0003]
The permanent magnet 103 is formed in a size that can be accommodated in the permanent magnet embedding hole 104. When embedding the permanent magnet 103 in the permanent magnet embedding hole 104, an adhesive is applied to the surface of the permanent magnet 103, and the permanent magnet is bonded and fixed to the permanent magnet embedding hole 104 by the adhesive. When an adhesive cannot be used for fixing the permanent magnet 103, the permanent magnet 103 is formed without a gap from the permanent magnet embedding hole 104, and when the permanent magnet 103 is embedded in the permanent magnet embedding hole 104, the permanent magnet 103 is formed. Is pressed by a pneumatic device or the like and forcedly inserted into the permanent magnet embedding hole 104.
[0004]
In addition, as disclosed in, for example, Japanese Patent Laid-Open No. 9-308149, there is known a permanent magnet embedded rotor in which another part is press-fitted into a magnet end face to fix the permanent magnet. FIG. 11 shows the permanent magnet embedded rotor. In this permanent magnet embedded rotor, after the permanent magnet 203 is inserted into the permanent magnet embedding hole 204 of the iron core 202, the permanent magnet 203 is fixed to the iron core 202 by the magnet fixing member 205. The permanent magnet 203 is fixed by the magnet fixing member 205 by pressing the permanent magnet 203 against the pressing portion 207 by press-fitting a tapered pin 206 formed on the magnet fixing member 205 into one end face of the permanent magnet 203. It is fixed by.
[0005]
A permanent magnet embedded rotor disclosed in Japanese Patent Laid-Open No. 9-200802 is also known. FIG. 12 shows the permanent magnet embedded rotor. In this permanent magnet embedded rotor, one core with protrusion 302a having a protrusion 307 is added to the permanent magnet embedding hole 304 portion of the laminated iron core 302 to form a rotor core 301 having a laminated structure, and the permanent magnet is embedded. The permanent magnet 303 is fixed to the rotor core 301 by deforming at least one iron core 302 inward in the radial direction so that the radially outer wall surface 305 in the working hole 304 is pressed against the permanent magnet 303.
[0006]
[Problems to be solved by the invention]
In the conventional permanent magnet embedded rotor as described above, since the permanent magnet 103 is formed in a size that can be accommodated in the permanent magnet embedding hole 104, the fixed position of the permanent magnet is not fixed, and the rotor is fixed. There was a problem that the amount of unbalance increased. In addition, when the permanent magnet 103 is embedded in the permanent magnet embedding hole 104, the adhesive is scraped away, so that the thickness of the adhesive layer cannot be stably secured, and the permanent magnet 103 is peeled off. There was a problem that led to lack.
[0007]
In the conventional permanent magnet embedded rotor in which the permanent magnet 103 is forcibly press-fitted into the permanent magnet embedding hole 104 without using an adhesive, the permanent magnet 103 is a sintered product and is brittle. The permanent magnet 103 is likely to be chipped or scratched by contact with the wall surface of the permanent magnet embedding hole 104 when the 103 is press-fitted. Further, when the surface of the permanent magnet 103 is coated for rust prevention or the like, the coating is easily peeled off. Moreover, in order to obtain the dimensional consistency between the permanent magnet 103 and the permanent magnet embedding hole 104, there is a problem that the dimensional accuracy of the permanent magnet 103 needs to be improved.
[0008]
As shown in Japanese Patent Laid-Open No. 9-308149, in the conventional permanent magnet embedded rotor, the permanent magnet 203 is not fixed in the radial direction. Fixing the magnet 203 in the circumferential direction presses the permanent magnet 203 in one direction, which causes a problem of variation in characteristics and an increase in the amount of unbalance.
[0009]
In addition, in the conventional permanent magnet embedded rotor as shown in Japanese Patent Application Laid-Open No. 9-200982, the permanent magnet 303 is not securely fixed in the circumferential direction, and therefore needs to be used in combination with an adhesive. The permanent magnet 303 is fixed in the radial direction by pressing the permanent magnet 303 in one direction with the iron core 302 and deforming the iron core 302, but the pressure applied to deform the iron core 302 is released. Then, there is a problem that the amount of deformation of the iron core 302 is reduced by the spring back, and the permanent magnet 303 cannot be completely fixed.
[0010]
This invention was made to solve the above-mentioned problems, suppresses the amount of rotor imbalance, and without using an adhesive, without permanent magnet chipping or scratching, and peeling of the coating. An object of the present invention is to obtain a permanent magnet embedded rotor of a permanent magnet motor having a structure in which a permanent magnet is stably fixed.
[0011]
[Means for Solving the Problems]
In order to achieve the above-described object, the rotor of the permanent magnet embedded motor according to the present invention is provided at equal intervals in the circumferential direction of the rotor laminated iron core by the number of poles of the rotor, and is long in the circumferential direction of the iron core and in the axial direction. has a rectangular permanent magnet embedding holes through each of the holes for embedding permanent magnets, the permanent magnets of the pole face and the core radially, mounted so that the direction of the magnetic poles of the adjacent ones is reversed In the permanent magnet embedded rotor of the permanent magnet motor, a permanent magnet positioning protrusion that is inclined outward in the circumferential direction is formed on either the radially inner side or the outer circumferential end of the permanent magnet embedding hole. The permanent magnet is fixed to the rotor laminated core by bending the protrusion for positioning the permanent magnet toward the end of the permanent magnet.
[0012]
In the rotor of the permanent magnet embedded motor according to the next invention, a notch portion is formed in the rotor laminated core of the root portion on the bent side of the permanent magnet positioning projection piece.
[0013]
The rotor of the permanent magnet embedded motor according to the next invention is formed such that the width A is 0.3 mm <A <1.5 mm, where A is the circumferential width of the permanent magnet positioning protrusion. It is what has been.
[0014]
The rotor of the permanent magnet embedded motor according to the next invention has a relationship of 95 ° <θ <180 °, where θ is the angle between the permanent magnet positioning protrusion and the long side of the permanent magnet embedding hole. Is formed.
[0015]
A permanent magnet embedded motor rotor according to the invention of the following at least one laminated rotor core of the permanent magnet positioning projections piece axial end, before the permanent magnet insertion, so as to overlap in the axial end face of the permanent magnet In addition, it is bent in advance.
[0016]
In the rotor of the permanent magnet embedded motor according to the next invention, after the permanent magnet is inserted into the permanent magnet embedding hole and the permanent magnet positioning projection piece is bent, the rotor does not have a permanent magnet at the axial end. The positioned permanent magnet positioning protrusion is bent deeper so as to overlap the axial end surface of the permanent magnet .
[0017]
In the rotor of the permanent magnet embedded motor according to the next invention, the permanent magnet positioning protrusion is formed only on at least the number of rotor laminated iron cores capable of obtaining the strength capable of fixing the permanent magnet.
[0018]
In the rotor of the permanent magnet embedded motor according to the next invention, an adhesive is applied to the permanent magnet.
[0019]
In the rotor of the permanent magnet embedded motor according to the next invention, the permanent magnet is a neodymium rare earth magnet.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a permanent magnet embedded rotor of a permanent magnet motor according to the present invention will be described below in detail with reference to the accompanying drawings.
[0021]
Embodiment 1 FIG.
1 and 2 show Embodiment 1 of an embedded permanent magnet rotor and an embedded permanent magnet motor according to the present invention. The permanent magnet embedded motor includes a stator 10, a permanent magnet embedded rotor 20, a rotating shaft 40 that supports the permanent magnet embedded rotor 20, a bearing member 41, and an outer structure 42. Yes.
[0022]
The stator 10 is obtained by applying a three-phase winding 13 to a stator laminated core 12 obtained by punching and laminating a silicon steel plate into a predetermined shape, for example, a shape having 36 slot openings 11 on an inner peripheral surface. The lead wire 14 is connected to the power supply unit. The number of the slot openings 11 and the number of poles of the stator core 12 are appropriately determined in consideration of characteristics.
[0023]
The embedded permanent magnet rotor 20 is embedded in a rotor laminated core 22 made of a laminated body of silicon steel plates punched into a predetermined shape, and embedded in magnet embedding holes 24 formed in the rotor laminated iron core 22 by the number of poles. It is comprised with the permanent magnet 23 for the pole number with which it was mounted | worn. The permanent magnet 23 can be composed of a neodymium rare earth magnet.
[0024]
FIG. 3 shows the embedded permanent magnet rotor 20 in the case of four poles. The permanent magnet embedded rotor 20 includes a rotor laminated core 22 and a permanent magnet 23. The rotor laminated iron core 22 is formed with four rectangular magnet embedding holes 24 that extend in the circumferential direction and are short in the radial direction and penetrated in the axial direction by four poles of the rotor in the circumferential direction. In each of the magnet embedding holes 24, a permanent magnet having a magnetic pole surface in the iron core radial direction is mounted so that the magnetic poles of adjacent ones are opposite in direction .
[0025]
The permanent magnet 23 is formed in a size that can be accommodated in the permanent magnet embedding hole 24, and is a permanent magnet positioning cut inclined radially inward at both circumferential ends of the magnet embedding hole 24. The chipped protrusion piece 25 is integrally formed. A cutout portion 26 is formed in the rotor laminated core of the root portion of the projection piece 25 on the bent side so that the cutout piece 25 with a cutout for positioning the permanent magnet can be easily bent (see FIG. 4).
[0026]
As shown in FIG. 4, the permanent magnet 23 is positioned and fixed. After the permanent magnet 23 is fitted into the permanent magnet embedding hole 24, the notched protrusion 25 for positioning the permanent magnet 23 is used with the tool. It is performed without using an adhesive by bending the end face side of the sheet. In particular, when bending the notched protruding piece 25 for positioning the permanent magnet, if both sides are bent in the same way, the permanent magnet 23 is fixed to the center and the radially outer side of the permanent magnet embedding hole 24. The unbalance amount of the rotor 20 by magnet assembly can be reduced.
[0027]
When the protrusion 25 with notch for positioning the permanent magnet is bent, the protrusion 25 is not bent until the entire surface comes into contact with the permanent magnet 23, but the portion where the protrusion 25 is brought into contact with the permanent magnet 23 is shown in FIG. As shown, only the corner portion 23a of the permanent magnet 23 is used. By doing so, even if there is a variation in the size of the permanent magnet 23, the fixing strength does not decrease due to the spring back, the fixing strength can be stably obtained, and the permanent magnet 23 is damaged due to excessive bending. Etc. can be prevented.
[0028]
When the circumferential width of the notched protruding piece 25 for positioning the permanent magnet is A, it is desirable that the protruding piece 25 is formed so as to satisfy a relationship of 0.3 mm <A <1.5 mm. If the circumferential width A of the protruding piece 25 is 0.3 mm or less, the required fixing strength of the permanent magnet 23 cannot be obtained, whereas the circumferential width A is 1.5 mm or less. If this is the case, the force required to bend the protruding piece 25 will increase, causing damage to the permanent magnet 23.
[0029]
When the angle between the permanent magnet positioning projection piece 25 having the notch 26 at the root portion and the long side of the permanent magnet embedding hole 24 is θ, the relationship is 95 ° <θ <180 °. It is desirable that it be formed. When the angle θ is 95 ° or less, the necessary fixing strength of the permanent magnet 23 cannot be obtained, and the permanent magnet 23 is damaged due to excessive bending. On the other hand, when the angle θ is 180 ° or more, the amount of deformation of the notched protruding piece 25 for positioning the permanent magnet becomes too large, and the damage of the protruding piece 25 becomes a problem.
[0030]
In the above-described embodiment, a perfect circle is applied to the outer diameter shape of the rotor. However, the permanent magnet embedded rotor according to the present invention is not limited to this, and any outer diameter embedded permanent magnet embedded rotor may be used. It is valid.
[0031]
In the embodiment described above, the notched protrusion 25 for positioning the permanent magnet is formed on the radially inner side of the permanent magnet embedding hole 24. However, the permanent magnet embedded rotor according to the present invention is not limited thereto. This is also effective for a permanent magnet embedded rotor in which the notched protrusion 25 for positioning the permanent magnet is formed on the radially outer side of the permanent magnet embedding hole 24.
[0032]
Further, as shown in FIG. 5, before the permanent magnet 23 is inserted into the permanent magnet embedding hole 24, the width that the permanent magnet 23 cannot pass through, in other words, it overlaps with the axial end surface of the permanent magnet 23. Further, the permanent magnets 23 can be positioned in the axial direction by bending in advance the notched protrusions 25 for positioning the permanent magnets of the several laminated rotor cores 22 at the end.
[0033]
Further, as shown in FIG. 6, after inserting the permanent magnet 23 into the permanent magnet embedding hole 24 and bending the notched protrusion 25 for positioning the permanent magnet, the permanent magnet 23 at the end in the axial direction is The permanent magnets 23 are fixed in the axial direction by bending the notched protrusions 25 for positioning the permanent magnets of several non-existing rotor laminated cores 22 so as to overlap the axial end surfaces of the permanent magnets 23. It can be carried out.
[0034]
Embodiment 2. FIG.
7 and 8 show Embodiment 2 of a permanent magnet embedded rotor according to the present invention. In this embodiment, in addition to the above-described embodiment, the notched protrusions 25 for positioning the permanent magnets are the minimum that can secure at least the fixing strength of the permanent magnets 23 rather than all the rotor laminated cores 22. The rotor laminated core 22 is provided only. Thereby, it is possible to reduce the force required for bending the notched protruding piece 25 for positioning the permanent magnet, and it is possible to obtain a bending facility at a low cost.
[0035]
Embodiment 3 FIG.
FIG. 9 shows Embodiment 3 of an embedded permanent magnet rotor according to the present invention. In this embodiment, in addition to the above-described embodiment, an adhesive 27 is applied to the permanent magnet 23, and the permanent magnet 23 is fixed by embedding the permanent magnet 23 in the permanent magnet embedding hole 24. . In this case, the permanent magnet 23 can be more firmly fixed, and the permanent magnet 23 and the notched protrusion for positioning the permanent magnet formed after the notched protrusion 25 for positioning the permanent magnet are bent. Since the adhesive 26 accumulates in the space 28 formed between the piece 25 and the notched portion 26 of the notched protrusion 25 for positioning the permanent magnet, the permanent magnet 23 can be more firmly fixed.
[0036]
【The invention's effect】
As will be understood from the above description, according to the embedded permanent magnet rotor of the present invention, the permanent magnet positioning notched protrusions with a notch are used without bending by coating the notched protrusions for positioning the permanent magnet. Since permanent magnets are fixed without causing peeling, and the permanent magnets can be fixed to the center and radially outer side or radially inner side of the permanent magnet embedding hole, the unbalance amount can be reduced. Also, according to the permanent magnet embedded rotor according to the present invention, since no permanent parts can be provided, the permanent magnet can be easily firmly fixed and the amount of unbalance is small. A permanent magnet embedded rotor can be obtained.
[0037]
According to the rotor of the permanent magnet embedded motor according to the next invention, since the notched portion is formed in the rotor laminated iron core at the base portion on the folding side of the permanent magnet positioning projection piece, the permanent magnet fixing permanent magnet is fixed. The magnet positioning projection piece can be easily bent.
[0038]
According to the rotor of the permanent magnet embedded motor according to the next invention, the permanent magnet positioning projection piece is formed so that the circumferential width A has a relationship of 0.3 mm <A <1.5 mm. The required fixing strength can be obtained, and a large force is not required for bending the protruding piece, and the permanent magnet is not damaged.
[0039]
According to the rotor of the permanent magnet embedded motor according to the next invention, when the angle between the permanent magnet positioning protrusion and the long side of the permanent magnet embedded hole is θ, the relationship is 95 ° <θ <180 °. Therefore, the required permanent magnet fixing strength can be obtained, and the deformation amount of the notched protrusion for positioning the permanent magnet does not become too large, and the damage to the protrusion is a problem. Never become.
[0040]
A permanent magnet embedded motor rotor according to the invention of the following at least one laminated rotor core of the permanent magnet positioning projections piece axial end, before the permanent magnet insertion overlaps the axial end of the permanent magnet Thus, since it is bent in advance, the axial positioning of the permanent magnet is performed.
[0041]
According to the rotor of the permanent magnet embedded motor according to the next invention, after the permanent magnet is inserted into the permanent magnet embedding hole and the permanent magnet positioning projection piece is bent, there is no permanent magnet at the end in the axial direction. Since the permanent magnet positioning projection piece located at the portion is bent further deeply so as to overlap the axial end portion of the permanent magnet, the permanent magnet is fixed in the axial direction.
[0042]
According to the permanent magnet buried motor rotor according to another aspect of the present invention, since the permanent magnet positioning projections pieces are formed only on the laminated rotor core of the number of least securable strength permanent magnets are obtained, a permanent magnet It is possible to reduce the force required for bending the positioning notched projection piece and to obtain a bending facility at a low cost.
[0043]
According to the rotor of the permanent magnet embedded motor according to the next invention, since the adhesive is applied to the permanent magnet, a stronger fixing strength of the permanent magnet can be obtained.
[0044]
According to the rotor of the permanent magnet embedded motor according to the next invention, since the permanent magnet is a neodymium rare earth magnet, required permanent magnet characteristics can be obtained.
[Brief description of the drawings]
FIG. 1 is an axial cross-sectional side view showing a first embodiment of a permanent magnet motor incorporating an embedded permanent magnet rotor according to the present invention.
FIG. 2 is a cross-sectional view perpendicular to an axis showing a first embodiment of a permanent magnet motor incorporating a permanent magnet embedded rotor according to the present invention;
FIG. 3 is a front view showing a first embodiment of a permanent magnet embedded rotor according to the present invention;
FIG. 4 is a partially enlarged front view of a notched protrusion for positioning a permanent magnet showing a first embodiment of an embedded permanent magnet rotor according to the present invention.
FIG. 5 is a partially enlarged perspective view of a notched protrusion for positioning a permanent magnet showing a first embodiment of an embedded permanent magnet rotor according to the present invention.
6 is a partially enlarged perspective view of a notched protrusion for positioning a permanent magnet showing a first embodiment of an embedded permanent magnet rotor according to the present invention. FIG.
FIG. 7 is a partially enlarged front view of a notched protrusion for positioning a permanent magnet showing a second embodiment of an embedded permanent magnet rotor according to the present invention.
8 is a cross-sectional view taken along the line XX shown in FIG.
FIG. 9 is a partially enlarged front view of a notched protrusion for positioning a permanent magnet showing a third embodiment of an embedded permanent magnet rotor according to the present invention.
FIG. 10 is a front view showing a structure of a conventional permanent magnet embedded rotor.
FIG. 11 is a front view showing a structure of a conventional permanent magnet embedded rotor.
FIG. 12 is a front view showing a structure of a conventional permanent magnet embedded rotor.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Stator, 11 Slot opening part, 12 Stator laminated iron core, 13 Three-phase winding, 14 Lead wire, 20 Permanent magnet embedded type rotor, 22 Rotor laminated iron core, 23 Permanent magnet, 24 Permanent magnet embedding hole, 25 Perforated piece with notch for positioning permanent magnet, 26 Notched portion, 27 Adhesive.

Claims (9)

回転子積層鉄心の円周方向に回転子の極数分等間隔に設けられ、鉄心周方向に長く軸方向に貫通する矩形の永久磁石埋め込み用穴を有し、前記永久磁石埋め込み用穴のそれぞれに、磁極面を鉄心径方向とする永久磁石が、隣接するもの同士の磁極の向きが逆になるように装着される永久磁石モータの永久磁石埋め込み型回転子において、
前記永久磁石埋め込み用穴の周方向両端部の径方向内側又は外側のいずれかに、周方向外側に傾斜する永久磁石位置決め用突起片が形成され、当該永久磁石位置決め用突起片の、前記永久磁石端部方向への折り曲げによって前記永久磁石が前記回転子積層鉄心に固定されることを特徴とする永久磁石モータの永久磁石埋め込み型回転子。Provided minutes equidistant poles of the rotor in the circumferential direction of the rotor laminated core has a rectangular permanent magnet embedding hole through the long axis direction in the core circumferential direction, each of the holes for embedding permanent magnet In addition, in the permanent magnet embedded rotor of the permanent magnet motor that is mounted so that the direction of the magnetic pole between adjacent ones of the permanent magnet having the magnetic pole surface in the iron core radial direction is reversed ,
Permanent magnet positioning projections inclined outward in the circumferential direction are formed on either the radially inner side or outer side of both ends in the circumferential direction of the permanent magnet embedding hole, and the permanent magnet positioning projection piece is the permanent magnet. A permanent magnet embedded rotor of a permanent magnet motor, wherein the permanent magnet is fixed to the rotor laminated core by bending in an end direction . 前記永久磁石位置決め用突起片の折り曲げ側の根元部分の回転子積層鉄心に切欠け部が形成されていることを特徴とする請求項１に記載の永久磁石モータの永久磁石埋め込み型回転子。2. The permanent magnet embedded rotor of a permanent magnet motor according to claim 1, wherein a notch portion is formed in a rotor laminated iron core at a base portion on the bent side of the permanent magnet positioning projection piece. 前記永久磁石位置決め用突起片の周方向の巾をＡとした場合、巾Ａが０．３ｍｍ＜Ａ＜１．５ｍｍの関係になるように形成されていることを特徴とする請求項１または２に記載の永久磁石モータの永久磁石埋め込み型回転子。3. The width A of the permanent magnet positioning projection piece is formed so that a relation of 0.3 mm <A <1.5 mm is established, where A is a circumferential width. A permanent magnet embedded rotor of the permanent magnet motor described in 1. 前記永久磁石位置決め用突起片と永久磁石埋め込み用穴の長辺との角度をθとした場合、９５°＜θ＜１８０°の関係になるように形成されていることを特徴とする請求項１〜３のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。  2. The permanent magnet positioning projection piece and the long side of the permanent magnet embedding hole are formed so as to have a relationship of 95 ° <θ <180 °, where θ is an angle. The permanent magnet embedded rotor of the permanent magnet motor as described in any one of -3. 軸方向端部の少なくとも１枚の回転子積層鉄心の永久磁石位置決め用突起片が、永久磁石挿入前に、永久磁石の軸方向端面に重なるように、予め折り曲げられていることを特徴とする請求項１〜４のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。 Claims axial ends of the at least one laminated rotor core of the permanent magnet positioning projections pieces, before the permanent magnet insertion, so as to overlap in the axial end surface of the permanent magnet, characterized in that the bent beforehand Item 5. A permanent magnet embedded rotor of a permanent magnet motor according to any one of Items 1 to 4. 永久磁石埋め込み用穴に永久磁石が挿入されて永久磁石位置決め用突起片の折り曲げが行われた後、軸方向端部の永久磁石がない部分に位置する永久磁石位置決め用突起片が、永久磁石の軸方向端面に重なるように、さらに深く折り曲げられていることを特徴とする請求項１〜４のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。After the permanent magnet is inserted into the permanent magnet embedding hole and the permanent magnet positioning projection piece is bent, the permanent magnet positioning projection piece positioned at the portion where the permanent magnet is not located at the end in the axial direction is The embedded permanent magnet rotor for a permanent magnet motor according to any one of claims 1 to 4 , wherein the rotor is further bent deeply so as to overlap the end face in the axial direction . 前記永久磁石位置決め用突起片は少なくとも永久磁石を固定可能な強度が得られる枚数の回転子積層鉄心にのみに形成されていることを特徴とする請求項１〜６のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。7. The permanent magnet positioning projection piece is formed only on at least a number of rotor laminated iron cores capable of obtaining a strength capable of fixing a permanent magnet. 8. A permanent magnet embedded rotor for a permanent magnet motor. 前記永久磁石に接着剤が塗布されていることを特徴とする請求項１〜７のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。  The permanent magnet embedded rotor of a permanent magnet motor according to any one of claims 1 to 7, wherein an adhesive is applied to the permanent magnet. 前記永久磁石がネオジウム系希土類磁石であることを特徴とする請求項１〜８のいずれか一つに記載の永久磁石モータの永久磁石埋め込み型回転子。  The permanent magnet embedded rotor of a permanent magnet motor according to any one of claims 1 to 8, wherein the permanent magnet is a neodymium rare earth magnet.
JP2000067525A 2000-03-10 2000-03-10 Permanent magnet embedded rotor for permanent magnet motor Expired - Lifetime JP4566319B2 (en)

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