JP2004064993A

JP2004064993A - Open type pm motor

Info

Publication number: JP2004064993A
Application number: JP2003140009A
Authority: JP
Inventors: Hiroshi Sato; 佐藤　寛
Original assignee: Meidensha Corp; Meidensha Electric Manufacturing Co Ltd
Current assignee: Meidensha Corp; Meidensha Electric Manufacturing Co Ltd
Priority date: 2002-06-04
Filing date: 2003-05-19
Publication date: 2004-02-26

Abstract

<P>PROBLEM TO BE SOLVED: To provide an open type PM motor in which it is possible to prevent the entry of foreign matters. <P>SOLUTION: The base end part of a first shielded object 16 is fixed on the inner face of a frame 1 closer to one end from a first open hole 14. Its tip part is made closer to a rotator 3 from a coil end 10 and to reach one end face of a stator 2. The base end part of a second shielded object 17 is fixed on the inner face of the frame 1 closer to the other end from a second open hole 15. Its tip part is made closer to the rotator 3 from a coil end 11 and to reach the other end face of the stator 2. Each gap among the first shielded object 16, the frame 1, and the stator 2 and each gap among the second shielded object 17, the frame 1, and the stator 2 are sealed by a sealing member 32 such as an adhesive and a compound. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明はＰＭモータ（回転子に永久磁石（ＰＭ）を使用したモータ）の構造、特に開放形の構造に関する。
【０００２】
【従来の技術】
従来のＰＭモータは、全閉構造とされている。その理由は、回転子に永久磁石を使用しているため、内部（特にギャップ面）に鉄粉等の異物が入った場合、不良（回転不能や、異音、特性のバラツキ等）の原因となるからである。
【０００３】
【発明が解決しようとする課題】
ＰＭモータは、ＩＭモータに比べ高トルク出力が可能となり、同じ定格であれば枠下げ（モータの大きさを小さく作製すること）ができる。しかし、ＰＭモータはＩＭモータに比べ効率が高いため発生損失が小さくなるが、それ以上にトルクアップによる枠下げの効果が大きいため、熱的には不利な状態となる。前述のようにＰＭモータは全閉構造を採らざるをえないため、冷却に限度があり、温度上昇のためだけに枠下げができないことがある。つまり、トルクは出せるが、温度上昇が規格に入らないため、１枠大きい外形にすることがある。
【０００４】
そこで本発明の課題は、開放形で、かつ、異物の侵入が阻止可能なＰＭモータを提供することを目的とする。
【０００５】
【課題を解決するための手段】
第１発明は上記課題を解決する開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームのうち第１開放穴よりも一端寄りの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの一端面に達する円筒形状の第１遮蔽物と、前記フレームのうち第２開放穴よりも他端寄りの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの他端面に達する円筒形状の第２遮蔽物と、第１遮蔽物とフレーム間の隙間、第１遮蔽物と固定子間の隙間、第２遮蔽物とフレーム間の隙間及び第２遮蔽物と固定子間の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【０００６】
第２発明は上記課題を解決する別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、第１ブラケットの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの一端面に達する円筒形状の第１遮蔽物と、第２ブラケットの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの他端面に達する円筒形状の第２遮蔽物と、第１遮蔽物と第１ブラケット間の隙間、第１遮蔽物と固定子間の隙間、第２遮蔽物と第２ブラケット間の隙間及び第２遮蔽物と固定子間の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【０００７】
第３発明は上記課題を解決する更に別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、第１ブラケットの内面に基端部が固定され、固定子と回転子とのギャップ面を貫通する円筒形状の第１遮蔽物と、第２ブラケットの内面に基端部が固定され、第１遮蔽物と先端部どうしが嵌まり合う円筒形状の第２遮蔽物と、第１遮蔽物と第１ブラケット間の隙間、第１遮蔽物と第２遮蔽物とが嵌まり合った部分の隙間及び第２遮蔽物と第２ブラケット間の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【０００８】
第４発明は上記課題を解決する別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、前記フレーム及び第１ブラケットに基端部が共締めされ、固定子と回転子とのギャップ面を貫通する円筒形状の第１遮蔽物と、前記フレーム及び第２ブラケットに基端部が共締めされ、第１遮蔽物と先端部どうしが嵌まり合う円筒形状の第２遮蔽物と、第１遮蔽物と第２遮蔽物とが嵌まり合った部分の隙間を封止する封止部材とを具備することを特徴とする。
【０００９】
第５発明は上記課題を解決する更に別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、前記フレームのうち第１の開放穴よりも一端寄りの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの一端面に達する円筒形状の第１遮蔽物と、第２ブラケットの内面に基端部が固定され、先端部が固定子のうちコイルエンドよりも回転子寄りの他端面に達する円筒形状の第２遮蔽物と、第１遮蔽物とフレーム間の隙間、第１遮蔽物と固定子間の隙間、第２遮蔽物と第２ブラケット間の隙間及び第２遮蔽物と固定子間の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【００１０】
第６発明は上記課題を解決する別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、第１ブラケットの内面に基端部が共締めされ、固定子と回転子とのギャップ面を貫通する円筒形状の第１遮蔽物と、第２ブラケットの内面に基端部が固定され、第１遮蔽物と先端部どうしが嵌まり合う円筒形状の第２遮蔽物と、第１遮蔽物と第２遮蔽物とが嵌まり合った部分の隙間及び第２遮蔽物と第２ブラケット間の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【００１１】
第７発明は上記課題を解決する更に別の開放形ＰＭモータであり、一端側に第１開放穴が、他端側に第２開放穴が形成されたフレームと、前記フレームの一端に取り付けられた第１ブラケットと、前記フレームの他端に取り付けられた第２ブラケットと、第１ブラケットの内面に基端部が固定され、固定子と回転子とのギャップ面を貫通する円筒形状の第１遮蔽物と、第２ブラケットの内面に基端部が共締めされ、第１遮蔽物と先端部どうしが嵌まり合う円筒形状の第２遮蔽物と、第１遮蔽物と第１ブラケット間の隙間及び第１遮蔽物と第２遮蔽物とが嵌まり合った部分の隙間をそれぞれ封止する封止部材とを具備することを特徴とする。
【００１２】
第８発明の開放形ＰＭモータは、第３発明または第４発明または第６発明または第７発明において、第１遮蔽物と第２遮蔽物とが嵌まり合った部分の隙間を封止する封止部材がＯリングであることを特徴とする。
【００１３】
第９発明の開放形ＰＭモータは、第３発明または第４発明または第６発明または第７発明または第８発明において、固定子の溝に隣接させて外気通風路を設けたことを特徴とする。
【００１４】
第１０発明の開放形ＰＭモータは、第３発明または第４発明または第６発明または第７発明または第８発明または第９発明において、固定子を構成している積層鉄板を複数に分割し、分割された積層鉄板をスペーサを介して積層したことを特徴とする。
【００１５】
第１１発明の開放形ＰＭモータは、第１０発明において、積層鉄板における、前記外気通風路間の内周部に第２外気通風路を設けたことを特徴とする。
【００１６】
【発明の実施の形態】
以下、図１〜図８を参照して、本発明の実施形態を説明する。
【００１７】
［第１実施例］
図１に本発明の第１実施例に係る開放形ＰＭモータの断面構造を示し、この開放形ＰＭモータに使用される第１遮蔽物１６及び第２遮蔽物１７の外観を図２に示す。
【００１８】
図１において、フレーム１内に固定子２が取り付けられ、永久磁石を使用した回転子３は円筒形状のギャップ４を介して固定子２の内側に配置されている。フレーム１の一端には第１ブラケット５が取り付けられ、フレーム１の他端には第２ブラケット６が取り付けられている。回転子３のシャフト７は、第１ブラケット５に装着した軸受８と第２ブラケット６に装着した軸受９により、支承されている。１０と１１は固定子２の両端面に突出したコイルエンドである。フレーム１の両端と第１ブラケット５及び第２ブラケット６との接続部１２、１３はそれぞれ、一体構造となっている。
【００１９】
フレーム１には、ＰＭモータを開放形構造とするために、その一端側にて第１開放穴１４が形成され、他端側にて第２開放穴１５が形成されている。
【００２０】
これらの第１開放穴１４及び第２開放穴１５から異物がギャップ４に侵入するのを阻止するために、第１遮蔽物１６と第２遮蔽物１７がフレーム１に固定されている。
【００２１】
図１、図２に示すように、第１遮蔽物１６及び第２遮蔽物１７はともに円筒形状をなし、それぞれ、円筒本体１８と、円筒本体１８の基端に連続して形成されたフランジ１９と、フランジ１９の先端に連続して形成されたが円筒部を有している。
【００２２】
第１遮蔽物１６の基端部は、フランジ１９先端の円筒部２０を利用して、フレーム１のうち第１開放穴１４よりも一端寄り（図１では右寄り）の内面に固定されている。第１遮蔽物１６がフレーム１の内面に固定された状態で、第１遮蔽物１６の先端部は、固定子２のうちコイルエンド１０よりも回転子３寄りの一端面（図１ではコイルエンド１０よりも下側の右側端面）に達している。同様に、第２遮蔽物１７の基端部は、フランジ１９先端の円筒部２０を利用して、フレーム１のうち第２開放穴１５よりも他端寄り（図１では左寄り）の内面に固定されている。第２遮蔽物１７がフレーム１の内面に固定された状態で、第２遮蔽物１７の先端部は、固定子２のうちコイルエンド１１よりも回転子３寄りの他端面（図１ではコイルエンド１１よりも下側の左側端面）に達している。
【００２３】
これにより、フレーム１の内面と第１遮蔽物１６の円筒部２０間の隙間、第１遮蔽物１６の円筒本体１８の先端と固定子２の右側端面間の隙間、固定子２の左側端面と第２遮蔽物１７の円筒本体１８の先端間の隙間及び第２遮蔽物１７の円筒部２０とフレーム１の内面間の隙間を除いて、ギャップ４とフレーム１の第１開放穴１４及び第２開放穴１５との間が遮蔽される。コイルエンド１０、１１は第１遮蔽物１６及び第２遮蔽物１７に対し、第１開放穴１４及び第２開放穴１５と同じ側に位置する。
【００２４】
ここで、第１遮蔽物１６及び第２遮蔽物１７について、フランジ１９先端の円筒部２０は、それがフレーム１の内面に丁度入るような太さにされている。また、円筒本体１８は、それの先端が固定子２の端面のうちコイルエンド１０や１１よりも回転子３寄りの端面に丁度装設するような長さ及び太さにされている。
【００２５】
第１遮蔽物１６及び第２遮蔽物１７の固定には、例えば、ボルト締めや焼きバメ等を適用することができる。ボルト締め方式の場合、フランジ１９先端の円筒部２０の周囲にボルト穴２１を明け、ボルト２２で第１遮蔽物１６及び第２遮蔽物１７をフレーム１に締め付ける。図示の例では、円筒部２０がフランジ１９を挟んで円筒本体１８とは反対側に存在しているが、円筒部２０が円筒本体１８と同じ側に存在する場合でも、フレーム１に開いている第１開放穴１６及び第２開放穴１７を利用することで、ボルト締めを容易に行うことができる。焼きバメ方式で第１遮蔽物１６及び第２遮蔽物１７を固定する場合は、ボルト穴２１の穴明け加工が不要である。
【００２６】
フレーム１と第１遮蔽物１６間の隙間、第１遮蔽物１６と固定子２間の隙間、固定子２と第２遮蔽物１７間の隙間及び第２遮蔽物１７とフレーム１間の隙間は、それぞれ封止部材２３により封止されている。封止部材２３としては、接着剤やコンパウンド等を用いることができ、これら接着剤やコンパウンド等を隙間に埋め込むことで、ギャップ４への異物の侵入を防止することができる。
【００２７】
これらの隙間を封止部材２３で埋め込む作業は、フレーム１に開いている第１開放穴１６及び第２開放穴１７を利用して容易に行うことができる。
【００２８】
このような第１実施例の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、ギャップ４を第１遮蔽物１６と第２遮蔽物１７により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良発生を防止することができる。
（３）　第１遮蔽物１６と第２遮蔽物１７を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
【００２９】
［第２実施例］
図３に本発明の第２実施例に係る開放形ＰＭモータの断面構造を示し、この開放形ＰＭモータに使用される第１遮蔽物２４及び第２遮蔽物２６の外観を図４に示す。
【００３０】
第２実施例を第１実施例と比べると、第１遮蔽物２４及び第２遮蔽物２６の取付相手がフレーム１ではなく、第１ブラケット５及び第２ブラケットである点が異なる。
【００３１】
ＰＭモータの基本的な構造は図１と同じであり、図３において、フレーム１内に固定子２が取り付けられ、永久磁石使用の回転子３がギャップ４を介して固定子２の内側に配置されている。フレーム１の一端には第１ブラケット５が、他端には第２ブラケット６が取り付けられている。回転子３のシャフト７は、第１ブラケット５の軸受８と第２ブラケット６の軸受９によって支承されている。１０と１１は固定子２のコイルエンドである。フレーム１には、ＰＭモータを開放形構造とするために、その一端側にて第１開放穴１４が形成され、他端側にて第２開放穴１５が形成されている。
【００３２】
これらの第１開放穴１４及び第２開放穴１５から異物がギャップ４に侵入するのを阻止するために、第１遮蔽物２４が第１ブラケット５に、第２遮蔽物２５が第２ブラケット６にそれぞれ固定されている。
【００３３】
図３、図４に示すように、第１遮蔽物２４及び第２遮蔽物２５はともに円筒形状をなし、それぞれ、円筒本体１８と、円筒本体１８の基端に連続して形成されたフランジ１９を有している。
【００３４】
第１遮蔽物２４の基端部は、フランジ１９を利用して、第１ブラケット５の内面に固定されている。第１遮蔽物２４が固定された状態で、第１遮蔽物２４の先端部は、固定子２のうちコイルエンド１０よりも回転子３寄りの一端面（図３ではコイルエンド１０よりも下側の右側端面）に達している。同様に、第２遮蔽物２５の基端部は、フランジ１９を利用して、第２ブラケット６の内面に固定されている。第２遮蔽物２５が固定された状態で、第２遮蔽物２５の先端部は、固定子２のうちコイルエンド１１よりも回転子３寄りの他端面（図３ではコイルエンド１１よりも下側の左側端面）に達している。
【００３５】
これにより、第１ブラケット５の内面と第１遮蔽物２４のフランジ１９間の隙間、第１遮蔽物２４の円筒本体１８の先端と固定子２の右側端面間の隙間、固定子２の左側端面と第２遮蔽物２５の円筒本体１８の先端間の隙間及び第２遮蔽物２４のフランジ１９と第２ブラケット６の内面間の隙間を除いて、ギャップ４とフレーム１の第１開放穴１４及び第２開放穴１５との間が遮蔽される。コイルエンド１０、１１は第１遮蔽物２４及び第２遮蔽物２５に対し、第１開放穴１４及び第２開放穴１５と同じ側に位置する。
【００３６】
ここで、第１遮蔽物２４及び第２遮蔽物２５について、円筒本体１８は、それの先端が固定子２の端面のうちコイルエンド１０や１１よりも回転子３寄りの端面に丁度当接するような長さ及び太さにされている。
【００３７】
第１遮蔽物２４及び第２遮蔽物２５の固定は、フランジ１９にボルト穴２１を明け、ボルト２２で第１遮蔽物２４及び第２遮蔽物２５を第１ブラケット５及び第１ブラケット６にそれぞれ締め付けることで実現している。
【００３８】
第１ブラケット５と第１遮蔽物２４間の隙間、第１遮蔽物２４と固定子２間の隙間、固定子２と第２遮蔽物２５間の隙間及び第２遮蔽物２５と第２ブラケット６間の隙間は、それぞれ接着剤やコンパウンド等の封止部材２３により封止されている。これら接着剤やコンパウンド等を隙間に埋め込むことで、ギャップ４への異物の侵入を防止することができる。隙間を封止部材２３で埋め込む作業は、フレーム１に開いている第１開放穴１４及び第２開放穴１５を利用して容易に行うことができる。
【００３９】
本例においては、第１遮蔽物２４の基端部が第１ブラケット５に、第２遮蔽物２５の基端部が第２ブラケット６にそれぞれ固定されることから、第１開放穴１４及び第２開放穴１５を、フレーム１の一端側及び他端側に代え、第１ブラケット５及び第２ブラケット６それぞれにて、フランジ１９の周囲に開けることで、所期の目的を達成することができる。また、フレーム１と第１ブラケット５及び第２ブラケット６の両方にそれぞれ第１開放穴１４及び第２開放穴１５を開けても良い。
【００４０】
このような第２実施例の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１実施例と同様、ギャップ４を第１遮蔽物２４と第２遮蔽物２５により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１実施例と同様、第１遮蔽物２４と第２遮蔽物２５を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
【００４１】
［第３実施例］
図５に本発明の第３実施例に係る開放形ＰＭモータの断面構造を示し、この開放形ＰＭモータに使用される第１遮蔽物２６及び第２遮蔽物２７の外観を図６に示す。
【００４２】
第３実施例を第１実施例及び第２実施例と比べると、第１遮蔽物２６と第２遮蔽物２７が先端部どうしで嵌まり合っている点が異なる。
【００４３】
ＰＭモータの基本的な構造は図１、図３と同じであり、図５において、フレーム１内に固定子２が取り付けられ、永久磁石使用の回転子３がギャップ４を介して固定子２の内側に配置されている。フレーム１の一端には第１ブラケット５が、他端には第２ブラケット６が取り付けられている。回転子３のシャフト７は、第１ブラケット５の軸受８と第２ブラケット６の軸受９によって支承されている。符号１０と１１は固定子２のコイルエンドである。フレーム１には、ＰＭモータを開放形構造とするために、その一端側にて第１開放穴１４が形成され、他端側にて第２開放穴１５が形成されている。
【００４４】
これらの第１開放穴１４及び第２開放穴１５からギャップ４に異物が侵入するのを阻止するために、第１遮蔽物２６が第１ブラケット５に、第２遮蔽物２７が第２ブラケット６にそれぞれ固定されている。
【００４５】
図５、図６に示すように、第１遮蔽物２６及び第２遮蔽物２７はともに円筒形状をなすが、第１遮蔽物２６の円筒本体１８と第２遮蔽物２７の円筒本体１８ａの径は互いに異なり、先端部どうしが嵌まり合う大きさになっている。各円筒本体１８、１８ａの基端にはフランジ１９が連続して形成されている。
【００４６】
第１遮蔽物２６の基端部は、フランジ１９を利用して、第１ブラケット５の内面に固定されており、その円筒本体１８が固定子２と回転子３とのギャップ４を貫通している。同様に第２遮蔽物２７の基端部は、フランジ１９を利用して、第２ブラケット６の内面に固定されているが、その円筒本体１８ａはギャップ４外にある。第１遮蔽物２６の先端部と第２遮蔽物２７の先端部とは互いに嵌まり合わさっている。
【００４７】
これにより、第１ブラケット５の内面と第１遮蔽物２６のフランジ１９間の隙間、第１遮蔽物２６の先端部（円筒本体１８）と第２遮蔽物２７の先端部（円筒本体１８ａ）が嵌まり合った部分の隙間及び第２遮蔽物２７のフランジ１９と第２ブラケット６の内面間の隙間を除いて、ギャップ４とフレーム１の第１開放穴１４及び第２開放穴１５との間が遮蔽される。コイルエンド１０、１１は第１遮蔽物２６及び第２遮蔽物２７に対し、第１開放穴１４及び第２開放穴１５と同じ側に位置する。
【００４８】
ここで、第１遮蔽物２６について、円筒本体１８は固定子２と回転子３間のギャップ４を貫通する長さと太さにされている。第２遮蔽物２７については、円筒本体１８ａが円筒本体１８と嵌まり合う長さと太さにされている。図５、図６では円筒本体１８ａが円筒本体１８よりも大径であるが、その逆でも良い。
【００４９】
円筒本体１８の太さはその内周が回転子３と接触しない範囲で任意で良いが、本例では、円筒本体１８の外径を固定子２の内径になるべく近くして、円筒本体１８と回転子３間のギャップを大きく確保している。
【００５０】
第１遮蔽物２６及び第２遮蔽物２７の固定は、フランジ１９にボルト穴２１を明け、ボルト２２で第１遮蔽物２６及び第２遮蔽物２７を第１ブラケット５及び第２ブラケット６に締め付けることで実現している。
【００５１】
第１ブラケット５と第１遮蔽物２６間の隙間及び第２遮蔽物２５と第２ブラケット６間の隙間は、それぞれ接着剤やコンパウンド等の封止部材２３により封止されている。これら接着剤やコンパウンド等を隙間に埋め込むことで、ギャップ４への異物の侵入を防止することができるので回転子３へ異物の侵入を防止できる。これらの隙間を封止部材２３で埋め込む作業は、フレーム１に開いている第１開放穴１４及び第２開放穴１５を利用して容易に行うことができる。
【００５２】
第１遮蔽物２６と第２遮蔽物２７の先端部どうしが嵌まり合った部分の隙間は、接着剤やコンパウンド等の封止部材２３で封止しても良いが、本例では、隙間にＯリング（封止部材）２４を装着することで、隙間の封止を行っている。Ｏリング２８で封止する場合は、封止作業が容易であるとともに、第１遮蔽物２６と第２遮蔽物２７を摺動させて嵌まり合う部分の長さを容易に調節できる。従って、第１遮蔽物２９及び第２遮蔽物３０の先端部と固定子２の端部との隙間を封止する必要がない。
【００５３】
本例においては、第１遮蔽物２６の基端部が第１ブラケット５に、第２遮蔽物２７の基端部が第２ブラケット６にそれぞれ固定されることから、第１開放穴１４及び第２開放穴１５を、フレーム１の一端側及び他端側に代え、第１ブラケット５及び第２ブラケット６それぞれにて、フランジ１９の周囲に開けることで、所期の目的を達成することができる。また、フレーム１と第１ブラケット及び第２ブラケットに第１開放穴１４及び第２開放穴１５を開口しても同様の効果が得られる。
【００５４】
このような第３実施例の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１、第２実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１、第２実施例と同様、ギャップ４を第１遮蔽物２６と第２遮蔽物２７により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１、第２実施例と同様、第１遮蔽物２４と第２遮蔽物２５を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第１遮蔽物２６及び第２遮蔽物２７は、モータの軸方向長さ（積代）が変化しても使用可能である。つまり、モータの積代に応じて第１遮蔽物２６と第２遮蔽物２７を摺動させ、嵌まり合う部分の長さを調節すれば対処できる。
（５）　第１遮蔽物２６がギャップ４を貫通していることから、第１、第２実施例とは異なり、第１遮蔽物２６及び第２遮蔽物２７の先端部と固定子２の端面との隙間を封止する必要がない。
【００５５】
［第４実施例］
図７に本発明の第４実施例に係る開放形ＰＭモータの断面構造を示し、この開放形ＰＭモータに使用される第１遮蔽物２９及び第２遮蔽物３０の外観を図８に示す。
【００５６】
第４実施例を第３実施例と比べると、第１遮蔽物２９及び第２遮蔽物３０の固定方法が異なる。
【００５７】
ＰＭモータの基本的な構造は図１、図３、図５と同じであり、図７において、フレーム１内に固定子２が取り付けられ、永久磁石使用の回転子３がギャップ４を介して固定子２の内側に配置されている。フレーム１の一端には第１ブラケット５が、他端には第２ブラケット６が取り付けられている。回転子３のシャフト７は、第１ブラケット５の軸受８と第２ブラケット６の軸受９によって支承されている。符号１０と１１は固定子２のコイルエンドである。フレーム１には、ＰＭ開放形構造とするために、その一端側にて第１開放穴１４が形成され、他端側にて第２開放穴１５が形成されている。外気の流れを図中矢印で示す。
【００５８】
これらの第１開放穴１４及び第２開放穴１５からギャップ４に異物が侵入するのを阻止するために、第１遮蔽物２９がフレーム１と第１ブラケット５と同時に共締めされ、第２遮蔽物３０もフレーム１と第２ブラケット６に同時に共締めされている。
【００５９】
図７、図８に示すように、第１遮蔽物２９及び第２遮蔽物３０はともに円筒形状をなすが、第１遮蔽物２９の円筒本体１８と第２遮蔽物３０の円筒本体１８ａの径は互いに異なり、先端部どうしが嵌まり合う大きさになっている。各円筒本体１８、１８ａの基端にはフランジ１９が連続して形成されている。但し、フランジ１９にはボルト穴が明けられていない。
【００６０】
第１遮蔽物２９の基端部は、フランジ１９をフレーム１と第１ブラケット５の接合面間に挿入することにより、フレーム１と第１ブラケット５と同時に共締めされて固定されており、その円筒本体１８は固定子２と回転子３とのギャップ４を貫通している。同様に、第２遮蔽物３０の基端部は、フランジ１９をフレーム１と第２ブラケット６の接合面間に挿入することにより、フレーム１と第２ブラケット６と同時に共締めされて固定されているが、その円筒本体１８ａはギャップ４外にある。第１遮蔽物２９の先端部と第２遮蔽物３０の先端部とは互いに嵌まり合わさっている。
【００６１】
これにより、第１遮蔽物２９の先端部（円筒本体１８）と第２遮蔽物３０の先端部（円筒本体１８ａ）が嵌まり合った部分の隙間を除いて、ギャップ４とフレーム１の第１開放穴１４及び第２開放穴１５との間が遮蔽される。コイルエンド１０、１１は第１遮蔽物２９及び第２遮蔽物３０に対し、第１開放穴１４及び第２開放穴１５と同じ側に位置する。
【００６２】
ここで、第３実施例と同様、第１遮蔽物２９については、円筒本体１８は固定子２と回転子３間のギャップ４を貫通する長さと太さにされている。また、第２遮蔽物３０については、円筒本体１８ａが円筒本体１８と嵌まり合う長さと太さにされている。図７、図８では円筒本体１８ａが円筒本体１８よりも大径であるが、その逆でも良い。
【００６３】
第１遮蔽物２９と第２遮蔽物３０の先端部どうしが嵌まり合った部分の隙間は、接着剤やコンパウンド等の封止部材２３で封止しても良いが、本例では、第３実施例と同様の理由で、隙間にＯリング（封止部材）２８を装着することで、隙間の封止を行っている。
【００６４】
このような第４実施例の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１、第２、第３実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１、第２、第３実施例と同様、ギャップ４を第１遮蔽物２９と第２遮蔽物３０により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１、第２、第３実施例と同様、第１遮蔽物２９と第２遮蔽物３０を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第３実施例と同様、第１遮蔽物２９及び第２遮蔽物３０は、モータの軸方向長さ（積代）が変化しても使用可能である。つまり、モータの積代に応じて第１遮蔽物２９と第２遮蔽物３０を摺動させ、嵌まり合う部分の長さを調節すれば対処できる。
（５）　第１遮蔽物２９がギャップ４を貫通していることから、第３実施例と同様、第１遮蔽物２９及び第２遮蔽物３０の先端部と固定子２の端面との隙間を封止する必要がない。
（６）　第１遮蔽物２９がフレーム１と第１ブラケット５に同時に共締めされ、第２遮蔽物３０がフレーム１と第２ブラケット６に同時に共締めされていることから、第３実施例とは異なり、第１遮蔽物２９と第１ブラケット５間の隙間及び第２遮蔽物３０と第２ブラケット６間の隙間を封止する必要がない。
【００６５】
［第５実施例：第１実施例と第２実施例の組み合わせ］
図示しないが、図１（第１実施例）中の第１遮蔽物１６を図３（第２実施例）中の第１遮蔽物２４に置き換え、フレーム１に代えて第１ブラケット５にボルト２２で固定したり、あるいは、図１（第１実施例）中の第２遮蔽物１７を図３（第２実施例）中の第２遮蔽物２５に置き換え、フレーム１に代えて第２ブラケット６にボルト２２で固定するように構成することができる。これは、図３（第２実施例）中の第１遮蔽物２４を図１（第１実施例）中の第１遮蔽物１６に置き換え、第１ブラケット５に代えてフレーム１にボルト２２や焼きバメで固定したり、あるいは、図３（第２実施例）中の第２遮蔽物２５を図１（第１実施例）中の第２遮蔽物１７に置き換え、第２ブラケット６に代えてフレーム１にボルト２２や焼きバメで固定することと等価である。
【００６６】
［第６実施例：第３実施例と第４実施例の組み合わせ（その１）］
図示しないが、図５（第３実施例）中の第１遮蔽物２６を図７（第４実施例）中の第１遮蔽物２９に置き換え、第１ブラケット５にボルト２２で固定する代りに、フレーム１と第１ブラケット５に同時に共締めして固定するように構成することができる。これは、図７（第４実施例）中の第２遮蔽物３０を図５（第３実施例）中の第２遮蔽物２７に置き換え、フレーム１と第２ブラケット６に同時に共締めする代りに、第２ブラケット６にボルト２２で固定することと等価である。
【００６７】
［第７実施例：第３実施例と第４実施例の組み合わせ（その２）］
図示しないが、第６実施例とは逆に、図５（第３実施例）中の第２遮蔽物２７を図７（第４実施例）中の第２遮蔽物３０に置き換え、第２ブラケット６にボルト２２で固定する代りに、フレーム１と第２ブラケット６に同時に共締めして固定するように構成することができる。これは、図７（第４実施例）中の第１遮蔽物２９を図５（第３実施例）中の第１遮蔽物２６に置き換え、フレーム１と第１ブラケット５に同時に共締めする代りに、第１ブラケット５にボルト２２で固定することと等価である。
【００６８】
［第８実施例］
図９に本発明の第８実施例に係る開放形ＰＭモータの断面構造を示し、図１０に固定子の断面図を示す。
【００６９】
ＰＭモータの基本的な構造は、図５の第３実施例と同じである。固定子２の内周部には多数の溝部３１が放射状に加工されている。溝部３１内の半径方向外側寄りにコイル３２が設けられ仕切り板３３にて保持されている。コイル３２が納められている溝部３１内の空間をコイル通路３４と呼ぶ。このコイル通路３４と隣接するように、仕切り板３３と第１遮蔽２６と溝部３１に挟まれた部分（以下、固定子歯部２ａ）に囲まれた部分が外気を通す外気通風路３５とされ、第１開放穴１４から入った外気は、フレーム１と固定子２の間のギャップ３６を通過するものと、外気通風路３５の中を通過するものに分かれる。この２つの外気の流れは、最終的に第２開放穴１５から流出する。図９中、外気の流れを矢印で示す。
【００７０】
このような第８実施形態の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１乃至第７実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１乃至第７実施例と同様、ギャップ４を第１遮蔽物２６と第２遮蔽物２７により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１乃至第７実施例と同様、第１遮蔽物２４と第２遮蔽物２５を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第１遮蔽物２６及び第２遮蔽物２７は、モータの軸方向長さ（積代）が変化しても使用可能である。つまり、モータの積代に応じて第１遮蔽物２６と第２遮蔽物２７を摺動させ、嵌まり合う部分の長さを調節すれば対処できる。
（５）　第１遮蔽物２６がギャップ４を貫通していることから、第１、第２、第５実施例とは異なり、第１遮蔽物２６及び第２遮蔽物２７の先端部と固定子２の端面との隙間を封止する必要がない。
（６）外気通風路３５を設けたことにより、固定子２及びコイル３２を直接に冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができる。
【００７１】
［第９実施例］
図１１に本発明の第９実施例に係る開放形ＰＭモータの断面構造を示し、図１２に固定子の断面図を示す。
【００７２】
ＰＭモータの基本的な構造は、図７の第４実施例と同じである。固定子２における隣り合う固定子溝部３１間の部分、つまり、固定子歯部２ａの先端に軸方向に沿って溝を加工する。固定子歯部２ａと第１遮蔽物２９に囲まれたこの溝を外気が通る外気通風路３７とする。固定子２は積層された鉄板２ｂより構成されている。この積層鉄板２ｂをいくつかに分割し、各分割された積層鉄板２ｂ間にスペーサ３８を配置する。２つの積層鉄板２ｂとその間のスペーサ３８に囲まれた部分が外気を通す第２外気通風路３９となる。このスペーサ３８は、積層鉄板２ｂ間に隙間を設け外気を流すためであるため、積層鉄板２ｂと同様にリング状にする必要はない。第１開放穴１４から入った外気は、フレーム１と固定子２の間のギャップ３６を通過するものと、外気通風路３７を通過するものとに分かれる。この２つの外気の流れは、最終的に第２開放穴１５から流出する。また、ギャップ３６を通過した外気は、外気通風路３９を通り外気通風路３７へ合流するものもある。図１１中、外気の流れを矢印で示す。
【００７３】
このような第９実施形態の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１乃至第８実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１乃至第８実施例と同様、ギャップ４を第１遮蔽物２９と第２遮蔽物３０により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１乃至第８実施例と同様、第１遮蔽物２９と第２遮蔽物３０を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第３、第４、第６、第７、第８実施例と同様、第１遮蔽物２９及び第２遮蔽物３０は、モータの軸方向長さ（積代）が変化しても使用可能である。つまり、モータの積代に応じて第１遮蔽物２９と第２遮蔽物３０を摺動させ、嵌まり合う部分の長さを調節すれば対処できる。
（５）　第１遮蔽物２９がギャップ４を貫通していることから、第３、第４、第６、第７、第８実施例と同様、第１遮蔽物２９及び第２遮蔽物３０の先端部と固定子２の端面との隙間を封止する必要がない。
（６）　第１遮蔽物２９がフレーム１と第１ブラケット５に同時に共締めされ、第２遮蔽物３０がフレーム１と第２ブラケット６に同時に共締めされていることから、第３、第８実施例とは異なり、第１遮蔽物２９と第１ブラケット５間の隙間及び第２遮蔽物３０と第２ブラケット６間の隙間を封止する必要がない。
（７）　外気通風路３７，３９を具備したことにより、固定子２及びコイル３２を直接に冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができる。
【００７４】
［第１０実施例：第８実施例と第９実施例の組み合わせ］
図１３に本発明の第１０実施例に係る開放形ＰＭモータの断面構造を示し、図１４に固定子の断面図を示す。本実施例は、第８実施例と第９実施例を組み合わせたものである。
【００７５】
ＰＭモータの基本的な構造は、図７の第４実施例と同じである。固定子溝部３１は第８実施例と固定子歯部２ａは実施例９と構造は同じである。固定子２の内周部には多数の溝部３１が放射状に加工されている。溝部３１内の半径方向外側寄りにコイル３２が設けられ、仕切り板３３にて保持されている。コイル３２が納められている溝部３１内の空間をコイル通路３４と呼ぶ。このコイル通路３４と隣接するように、仕切り板３３と第１遮蔽２９と固定子歯部２ａに囲まれた部分が外気を通す外気通風路３５とする。固定子２における隣り合う固定子溝部３１間の部分、つまり、固定子歯部２ａの先端に軸方向に沿って溝を加工する。固定子歯部２ａと第１遮蔽物２９に囲まれたこの溝を外気が通る外気通風路３７とする。固定子２は積層された鉄板２ｂより構成されている。この積層鉄板２ｂをいくつかに分割し、各分割された積層鉄板２ｂ間にスペーサ３８を配置する。２つの積層鉄板２ｂとその間のスペーサ３８に囲まれた部分を外気が通る第２外気通風路３９とする。
【００７６】
第１開放穴１４から入った外気は、フレーム１と固定子２の間のギャップ３６を通過するものと、外気通風路３５を通過するものと、外気通風路３７を通過にするものに分かれる。これらは最終的に第２開放穴１５から流出する。また、ギャップ３６を通過した外気は、外気通風路３９を通り外気通風路３５及び外気通風路３７へ合流するものもある。図１３中、外気の流れを矢印で示す。
【００７７】
このような第９実施形態の開放形ＰＭモータにあっては、以下の効果がある。
（１）　第１乃至第８実施例と同様、第１開放穴１４と第２開放穴１５を通して外気で直接コイルエンド１０、１１を冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができ、枠下げが可能となる。
（２）　開放形ＰＭモータであっても、第１乃至第８実施例と同様、ギャップ４を第１遮蔽物２９と第２遮蔽物３０により第１開放穴１４及び第２開放穴１５から遮蔽するので、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良を防止することができる。
（３）　第１乃至第８実施例と同様、第１遮蔽物２９と第２遮蔽物３０を備えることにより、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第３、第４、第６、第７、第８実施例と同様、第１遮蔽物２９及び第２遮蔽物３０は、モータの軸方向長さ（積代）が変化しても使用可能である。つまり、モータの積代に応じて第１遮蔽物２９と第２遮蔽物３０を摺動させ、嵌まり合う部分の長さを調節すれば対処できる。
（５）　第１遮蔽物２９がギャップ４を貫通していることから、第３、第４、第６、第７、第８実施例と同様、第１遮蔽物２９及び第２遮蔽物３０の先端部と固定子２の端面との隙間を封止する必要がない。
（６）　第１遮蔽物２９がフレーム１と第１ブラケット５に同時に共締めされ、第２遮蔽物３０がフレーム１と第２ブラケット６に同時に共締めされていることから、第３、第８実施例とは異なり、第１遮蔽物２９と第１ブラケット５間の隙間及び第２遮蔽物３０と第２ブラケット６間の隙間を封止する必要がない。
（７）　外気通風路３５，３７，３９を具備したことにより、固定子２及びコイル３２を直接に冷却することができるため、従来の全閉形のものに比べ、温度低減を図ることができる。
【００７８】
【発明の効果】
以上詳細に説明したように、本発明によれば、以下の効果がある。
（１）　第１発明〜第１１発明ともに、ＰＭモータをフレームに第１開放穴と第２開放穴が形成された開放形にしたことにより、第１開放穴と第２開放穴を通して外気で直接コイルエンドを冷却することができるため、従来の全閉形ＰＭモータに比べ、温度低減を図ることができ、枠下げが可能となった。ＰＭモータをフレームに第１開放穴と第２開放穴が開放形にしたことにより、第１開放穴と第２開放穴を通して外気で直接コイルエンドを冷却することができるため、従来の全閉形ＰＭモータに比べ、温度低減を図ることができる。
（２）　開放形ＰＭモータであっても、第１発明〜第１１発明ともに、ギャップを第１遮蔽物と第２遮蔽物で第１開放穴及び第２開放穴から遮蔽するので、全閉形と同様、モータ内部への異物の侵入を防ぐことができ、異物侵入に伴う不良発生を防止することができる。
（３）　第１発明〜第１１発明ともに、第１遮蔽物と第２遮蔽物を備えるので、冷却面積が増加し、温度上昇を抑えることができる。
（４）　第３発明〜第４発明、第６発明〜第１１発明では、第１遮蔽物と第２遮蔽物とが先端部どうしで嵌まり合うので、モータの軸方向長さ（積代）が変化しても使用可能である。
（５）　第３発明〜第４発明、第６発明〜第１１発明では、第１遮蔽物がギャップ４を貫通するので、第１遮蔽物及び第２遮蔽物の先端部と固定子の端面との隙間を封止する必要がない。
（６）　第４発明では、第１遮蔽物がフレームと第１ブラケットに同時に共締めされ、第２遮蔽物がフレームと第２ブラケットに同時に共締めされるので、第１遮蔽物と第１ブラケット間の隙間及び第２遮蔽物と第２ブラケット間の隙間を封止する必要がない。この効果は、第６発明〜第１１発明における同等部分にもいえることである。
（７）　第８発明では、第１遮蔽物と第２遮蔽物の先端部どうしが嵌まり合った部分の隙間をＯリングで封止するので、封止作業が容易である。また、第１遮蔽物と第２遮蔽物の嵌まり合う部分の長さを容易に調節することができ、モータの軸方向長さ（積代）の変化に対して容易に対処することができる。
（８）　第９発明では、固定子溝部に外気通風路を設けることにより。固定子及びコイルを直接冷却することができる。冷却面積が増大し、従来の全閉形のものに比べ、温度低減を図ることができる。
（９）　第１０発明では、積層鉄板の間にスペーサを挟み外気通風路を形成させたことにより、固定子の内部とコイルを直接冷却できる。また、従来の全閉形のものに比べ冷却性能が改善されるのでモータの小型化が可能である。
（１０）　第１１発明では、固定子歯部先端に外気通風路を形成させたことにより、固定子を直接冷却ができる。
【図面の簡単な説明】
【図１】本発明の第１実施例に係る開放形ＰＭモータの上半分の断面図。
【図２】第１実施例で使用した第１遮蔽物及び第２遮蔽物の外観図。
【図３】本発明の第２実施例に係る開放形ＰＭモータの上半分の断面図。
【図４】第２実施例で使用した第１遮蔽物及び第２遮蔽物の外観図。
【図５】本発明の第３実施例に係る開放形ＰＭモータの上半分の断面図。
【図６】第３実施例で使用した第１遮蔽物及び第２遮蔽物の外観図。
【図７】本発明の第４実施例に係る開放形ＰＭモータの上半分の断面図。
【図８】第４実施例で使用した第１遮蔽物及び第２遮蔽物の外観図。
【図９】本発明の第８実施例に係る開放形ＰＭモータの上半分の断面図。
【図１０】第８実施例で使用した固定子の断面図。
【図１１】本発明の第９実施例に係る開放形ＰＭモータの上半分の断面図。
【図１２】第９実施例で使用した固定子の断面図。
【図１３】本発明の第１０実施例に係る開放形ＰＭモータの上半分の断面図。
【図１４】第１０実施例で使用した固定子の断面図。
【符号の説明】
１　フレーム
２　固定子
２ａ　固定子歯部
２ｂ　積層鉄板
３　永久磁石（ＰＭ）を使用した回転子
４　ギャップ
５　第１ブラケット
６　第２ブラケット
７　回転子のシャフト
８、９　軸受
１０、１１　コイルエンド
１２　フレームと第１ブラケットとの接続部
１３　フレームと第２ブラケットとの接続部
１４　第１開放穴
１５　第２開放穴
１６　第１遮蔽物（第１実施例）
１７　第２遮蔽物（第１実施例）
１８　円筒本体
１８ａ　円筒本体
１９　フランジ
２０　円筒部
２１　ボルト穴
２２　ボルト
２３　封止部材（接着剤やコンパウンド等）
２４　第１遮蔽物（第２実施例）
２５　第２遮蔽物（第２実施例）
２６　第１遮蔽物（第３実施例）
２７　第２遮蔽物（第３実施例）
２８　Ｏリング
２９　第１遮蔽物（第４実施例）
３０　第２遮蔽物（第４実施例）
３１　固定子溝部
３２　コイル
３３　仕切り板
３４　コイル通路
３５　外気通風路
３６　ギャップ
３７　外気通風路
３８　スペーサ
３９　外気通風路[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a structure of a PM motor (motor using a permanent magnet (PM) for a rotor), and particularly to an open type structure.
[0002]
[Prior art]
The conventional PM motor has a fully closed structure. The reason is that since permanent magnets are used for the rotor, if foreign matter such as iron powder enters inside (especially the gap surface), it may cause failure (rotation impossible, abnormal noise, characteristic variation, etc.). Because it becomes.
[0003]
[Problems to be solved by the invention]
The PM motor can output a higher torque than the IM motor, and can be framed down (made smaller in size) with the same rating. However, the PM motor has a higher efficiency than the IM motor, so that the generated loss is small. However, since the effect of lowering the frame by increasing the torque is greater, the PM motor is disadvantageously thermally disadvantageous. As described above, since the PM motor is forced to adopt a fully-closed structure, there is a limit to cooling, and the frame cannot be lowered only due to a rise in temperature. That is, although the torque can be generated, the outer shape may be larger by one frame because the temperature rise does not meet the standard.
[0004]
Therefore, an object of the present invention is to provide a PM motor that is open and capable of preventing foreign matter from entering.
[0005]
[Means for Solving the Problems]
A first aspect of the present invention is an open-type PM motor that solves the above-mentioned problems, and includes a frame having a first open hole formed at one end and a second open hole formed at the other end, and a frame having a first open hole formed at the other end. A base end portion is fixed to an inner surface near one end, and a distal end portion reaches a first end surface closer to the rotor than the coil end of the stator. A second cylindrical shield having a base end fixed to the inner surface near the other end and a distal end reaching the other end of the stator closer to the rotor than the coil end, and a gap between the first shield and the frame; And a sealing member for sealing the gap between the first shield and the stator, the gap between the second shield and the frame, and the gap between the second shield and the stator.
[0006]
A second invention is another open type PM motor which solves the above-mentioned problem, and is provided with a frame having a first open hole on one end side and a second open hole on the other end side, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a base end portion fixed to an inner surface of the first bracket, and a distal end portion is provided on one end surface of the stator closer to the rotor than the coil end. A first cylindrical shield reaching the inner end of the second bracket, and a second shield reaching the other end of the stator closer to the rotor than the coil end of the stator. The gap between the first shield and the first bracket, the gap between the first shield and the stator, the gap between the second shield and the second bracket, and the gap between the second shield and the stator, respectively. And a sealing member to be used.
[0007]
The third invention is still another open-type PM motor that solves the above-mentioned problems, and is attached to a frame having a first open hole formed on one end and a second open hole formed on the other end, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a first cylindrical member having a base end portion fixed to an inner surface of the first bracket and penetrating a gap surface between the stator and the rotor. A shield, a cylindrical second shield in which a base end is fixed to an inner surface of the second bracket, and the first shield and the distal end are fitted to each other; a gap between the first shield and the first bracket; It is characterized by including a sealing member for sealing a gap between a portion where the first shield and the second shield are fitted and a gap between the second shield and the second bracket.
[0008]
A fourth invention is another open-type PM motor that solves the above-mentioned problem, and is attached to a frame having a first open hole at one end and a second open hole at the other end, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a cylindrical shaped second end having a base end fastened to the frame and the first bracket and penetrating a gap surface between the stator and the rotor. 1 shield, a cylindrical second shield in which a base end is fastened to the frame and the second bracket together, and the first shield and the distal end are fitted together, a first shield, and a second shield And a sealing member for sealing a gap in a portion where the fitting is performed.
[0009]
A fifth invention is still another open-type PM motor that solves the above-mentioned problem, and is attached to a frame having a first open hole formed at one end and a second open hole formed at the other end, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a base end portion fixed to an inner surface of the frame closer to one end than the first open hole, and a tip end portion of the stator. A first cylindrical shield that reaches one end face closer to the rotor than the coil end; and a base end portion fixed to the inner surface of the second bracket, and a tip end portion of the stator closer to the rotor than the coil end. A cylindrical second shield reaching the end face, a gap between the first shield and the frame, a gap between the first shield and the stator, a gap between the second shield and the second bracket, and a second shield. A sealing member for sealing the gap between the stators. Characterized in that it Bei.
[0010]
A sixth aspect of the present invention is another open-type PM motor that solves the above-mentioned problems, and is provided with a frame having a first open hole at one end and a second open hole at the other end, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a first cylindrical member having a base end fastened to an inner surface of the first bracket and penetrating a gap surface between the stator and the rotor. A shield, a cylindrical second shield in which a base end portion is fixed to the inner surface of the second bracket, and the first shield and the distal end are fitted to each other, and the first shield and the second shield are fitted. It is characterized by comprising a sealing member for sealing the gap between the fitted portions and the gap between the second shield and the second bracket.
[0011]
A seventh invention is still another open-type PM motor that solves the above-mentioned problem, and is attached to a frame having a first open hole at one end and a second open hole at the other end, and attached to one end of the frame. A first bracket, a second bracket attached to the other end of the frame, and a first cylindrical member having a base end portion fixed to an inner surface of the first bracket and penetrating a gap surface between the stator and the rotor. A shield, a cylindrical second shield in which a base end portion is fastened to an inner surface of the second bracket together and the first shield and the distal end fit together, and a gap between the first shield and the first bracket And a sealing member that seals a gap between portions where the first shield and the second shield are fitted.
[0012]
An open-type PM motor according to an eighth aspect of the present invention, in the third aspect, the fourth aspect, the sixth aspect, or the seventh aspect, is a seal that seals a gap between portions where the first shield and the second shield are fitted. The stop member is an O-ring.
[0013]
An open-type PM motor according to a ninth invention is characterized in that, in the third invention, the fourth invention, the sixth invention, the seventh invention, or the eighth invention, an outside air passage is provided adjacent to the groove of the stator. .
[0014]
An open-type PM motor according to a tenth aspect of the present invention provides the open-type PM motor according to the third aspect, the fourth aspect, the sixth aspect, the seventh aspect, the eighth aspect, or the ninth aspect, wherein the laminated iron plate forming the stator is divided into a plurality of pieces. It is characterized in that the divided laminated iron plates are laminated via a spacer.
[0015]
An open-type PM motor according to an eleventh invention is characterized in that, in the tenth invention, a second outside air passage is provided in an inner peripheral portion of the laminated iron plate between the outside air passages.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0017]
[First embodiment]
FIG. 1 shows a cross-sectional structure of an open-type PM motor according to a first embodiment of the present invention, and FIG. 2 shows the appearance of a first shield 16 and a second shield 17 used in the open-type PM motor.
[0018]
In FIG. 1, a stator 2 is mounted in a frame 1, and a rotor 3 using a permanent magnet is arranged inside the stator 2 via a cylindrical gap 4. A first bracket 5 is attached to one end of the frame 1, and a second bracket 6 is attached to the other end of the frame 1. The shaft 7 of the rotor 3 is supported by a bearing 8 mounted on the first bracket 5 and a bearing 9 mounted on the second bracket 6. Reference numerals 10 and 11 denote coil ends protruding from both end surfaces of the stator 2. The connecting portions 12 and 13 between the both ends of the frame 1 and the first bracket 5 and the second bracket 6 have an integral structure.
[0019]
The frame 1 has a first open hole 14 at one end and a second open hole 15 at the other end in order to make the PM motor open.
[0020]
A first shield 16 and a second shield 17 are fixed to the frame 1 in order to prevent foreign matter from entering the gap 4 from the first open hole 14 and the second open hole 15.
[0021]
As shown in FIGS. 1 and 2, the first shield 16 and the second shield 17 are both cylindrical, and each has a cylindrical body 18 and a flange 19 formed continuously with the base end of the cylindrical body 18. And a cylindrical portion formed continuously at the tip of the flange 19.
[0022]
The base end of the first shield 16 is fixed to the inner surface of the frame 1 closer to one end (to the right in FIG. 1) than the first open hole 14 using the cylindrical portion 20 at the tip of the flange 19. In a state where the first shield 16 is fixed to the inner surface of the frame 1, one end face of the stator 2 closer to the rotor 3 than the coil end 10 of the stator 2 (the coil end in FIG. 1). 10 (right end face below 10). Similarly, the base end of the second shield 17 is fixed to the inner surface of the frame 1 closer to the other end (to the left in FIG. 1) than the second open hole 15 using the cylindrical portion 20 at the tip of the flange 19. Have been. In a state where the second shield 17 is fixed to the inner surface of the frame 1, the tip of the second shield 17 is connected to the other end face of the stator 2 closer to the rotor 3 than the coil end 11 (in FIG. 1, the coil end). 11 (left end face below 11).
[0023]
Thereby, the gap between the inner surface of the frame 1 and the cylindrical portion 20 of the first shield 16, the gap between the tip of the cylindrical body 18 of the first shield 16 and the right end face of the stator 2, and the left end face of the stator 2 Except for the gap between the distal end of the cylindrical body 18 of the second shield 17 and the gap between the cylindrical portion 20 of the second shield 17 and the inner surface of the frame 1, the gap 4 and the first open hole 14 and the second The space between the opening 15 is shielded. The coil ends 10 and 11 are located on the same side as the first opening 14 and the second opening 15 with respect to the first shield 16 and the second shield 17.
[0024]
Here, regarding the first shield 16 and the second shield 17, the cylindrical portion 20 at the tip of the flange 19 is so thick that it just fits into the inner surface of the frame 1. Further, the cylindrical body 18 has a length and a thickness such that the tip thereof is just installed on the end face of the stator 2 closer to the rotor 3 than the coil ends 10 and 11.
[0025]
For fixing the first shield 16 and the second shield 17, for example, bolting or shrink fitting can be applied. In the case of the bolting method, a bolt hole 21 is formed around the cylindrical portion 20 at the tip of the flange 19, and the first shield 16 and the second shield 17 are fastened to the frame 1 with the bolt 22. In the illustrated example, the cylindrical portion 20 exists on the opposite side of the cylindrical body 18 with the flange 19 interposed therebetween. However, even when the cylindrical portion 20 exists on the same side as the cylindrical body 18, the cylindrical portion 20 is open to the frame 1. By using the first open hole 16 and the second open hole 17, bolt fastening can be easily performed. When fixing the first shield 16 and the second shield 17 by the shrink fit method, it is not necessary to drill the bolt holes 21.
[0026]
The gap between the frame 1 and the first shield 16, the gap between the first shield 16 and the stator 2, the gap between the stator 2 and the second shield 17, and the gap between the second shield 17 and the frame 1 , Respectively, are sealed by a sealing member 23. As the sealing member 23, an adhesive, a compound, or the like can be used. By embedding the adhesive, the compound, or the like in the gap, entry of foreign matter into the gap 4 can be prevented.
[0027]
The work of filling these gaps with the sealing member 23 can be easily performed using the first open hole 16 and the second open hole 17 opened in the frame 1.
[0028]
The open type PM motor according to the first embodiment has the following effects.
(1) Since the coil ends 10, 11 can be directly cooled by the outside air through the first opening hole 14 and the second opening hole 15, the temperature can be reduced as compared with the conventional fully closed type, and the frame can be lowered. Becomes possible.
(2) Even in the case of an open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 16 and the second shield 17, so that foreign matter enters the motor. Can be prevented, and the occurrence of defects due to foreign matter intrusion can be prevented.
(3) By providing the first shield 16 and the second shield 17, the cooling area increases, and the temperature rise can be suppressed.
[0029]
[Second embodiment]
FIG. 3 shows a cross-sectional structure of an open-type PM motor according to a second embodiment of the present invention, and FIG. 4 shows the appearance of a first shield 24 and a second shield 26 used in the open-type PM motor.
[0030]
The second embodiment is different from the first embodiment in that the first shield 24 and the second shield 26 are attached not to the frame 1 but to the first bracket 5 and the second bracket.
[0031]
The basic structure of the PM motor is the same as that of FIG. 1. In FIG. 3, a stator 2 is mounted in a frame 1, and a rotor 3 using a permanent magnet is arranged inside the stator 2 via a gap 4. Have been. A first bracket 5 is attached to one end of the frame 1 and a second bracket 6 is attached to the other end. The shaft 7 of the rotor 3 is supported by a bearing 8 of the first bracket 5 and a bearing 9 of the second bracket 6. 10 and 11 are coil ends of the stator 2. The frame 1 has a first open hole 14 at one end and a second open hole 15 at the other end in order to make the PM motor open.
[0032]
In order to prevent foreign matter from entering the gap 4 from the first opening hole 14 and the second opening hole 15, the first shield 24 is attached to the first bracket 5, and the second shield 25 is attached to the second bracket 6. Are fixed respectively.
[0033]
As shown in FIGS. 3 and 4, the first shield 24 and the second shield 25 are both cylindrical, and each has a cylindrical body 18 and a flange 19 formed continuously at the base end of the cylindrical body 18. have.
[0034]
The base end of the first shield 24 is fixed to the inner surface of the first bracket 5 using the flange 19. In a state where the first shield 24 is fixed, one end face of the stator 2 closer to the rotor 3 than the coil end 10 of the stator 2 (the lower side than the coil end 10 in FIG. 3). Right end face). Similarly, the base end of the second shield 25 is fixed to the inner surface of the second bracket 6 using the flange 19. In a state where the second shield 25 is fixed, the tip end of the second shield 25 is the other end face of the stator 2 closer to the rotor 3 than the coil end 11 (the lower side of the coil end 11 in FIG. 3). Left end face).
[0035]
Thereby, the gap between the inner surface of the first bracket 5 and the flange 19 of the first shield 24, the gap between the tip of the cylindrical body 18 of the first shield 24 and the right end face of the stator 2, the left end face of the stator 2 The gap 4 and the first open hole 14 of the frame 1 except for the gap between the tip of the cylindrical body 18 of the second shield 25 and the gap between the flange 19 of the second shield 24 and the inner surface of the second bracket 6. The space between the second opening hole 15 is shielded. The coil ends 10 and 11 are located on the same side as the first open hole 14 and the second open hole 15 with respect to the first shield 24 and the second shield 25.
[0036]
Here, with respect to the first shield 24 and the second shield 25, the tip of the cylindrical body 18 is in contact with the end face of the stator 2 closer to the rotor 3 than the coil end 10 or 11 among the end faces of the stator 2. Length and thickness.
[0037]
To fix the first shield 24 and the second shield 25, a bolt hole 21 is made in the flange 19, and the first shield 24 and the second shield 25 are bolted to the first bracket 5 and the first bracket 6, respectively. This is achieved by tightening.
[0038]
The gap between the first bracket 5 and the first shield 24, the gap between the first shield 24 and the stator 2, the gap between the stator 2 and the second shield 25, and the second shield 25 and the second bracket 6 The gaps between them are sealed by a sealing member 23 such as an adhesive or a compound. By embedding these adhesives or compounds in the gaps, it is possible to prevent foreign substances from entering the gap 4. The operation of filling the gap with the sealing member 23 can be easily performed using the first open hole 14 and the second open hole 15 opened in the frame 1.
[0039]
In this example, the base end of the first shield 24 is fixed to the first bracket 5 and the base end of the second shield 25 is fixed to the second bracket 6, respectively. The intended purpose can be achieved by forming the two opening holes 15 around the flange 19 with the first bracket 5 and the second bracket 6 instead of the one end and the other end of the frame 1. . Further, the first open hole 14 and the second open hole 15 may be formed in the frame 1 and both the first bracket 5 and the second bracket 6, respectively.
[0040]
The following effects are obtained in the open type PM motor of the second embodiment.
(1) As in the first embodiment, since the coil ends 10 and 11 can be directly cooled by the outside air through the first open hole 14 and the second open hole 15, the temperature can be reduced as compared with the conventional fully closed type. Can be planned and the frame can be lowered.
(2) Even in the open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 24 and the second shield 25 as in the first embodiment. Foreign matter can be prevented from entering the inside of the motor, and defects due to foreign matter can be prevented.
(3) As in the first embodiment, the provision of the first shield 24 and the second shield 25 increases the cooling area and suppresses the temperature rise.
[0041]
[Third embodiment]
FIG. 5 shows a cross-sectional structure of an open-type PM motor according to a third embodiment of the present invention, and FIG. 6 shows the appearance of a first shield 26 and a second shield 27 used in the open-type PM motor.
[0042]
The third embodiment is different from the first and second embodiments in that the first shield 26 and the second shield 27 are fitted together at the ends.
[0043]
The basic structure of the PM motor is the same as in FIGS. 1 and 3. In FIG. 5, a stator 2 is mounted in a frame 1, and a rotor 3 using a permanent magnet is connected to the stator 2 through a gap 4. It is located inside. A first bracket 5 is attached to one end of the frame 1 and a second bracket 6 is attached to the other end. The shaft 7 of the rotor 3 is supported by a bearing 8 of the first bracket 5 and a bearing 9 of the second bracket 6. Reference numerals 10 and 11 are coil ends of the stator 2. The frame 1 has a first open hole 14 formed at one end thereof and a second open hole 15 formed at the other end thereof so that the PM motor has an open structure.
[0044]
In order to prevent foreign matter from entering the gap 4 from the first opening hole 14 and the second opening hole 15, the first shield 26 is attached to the first bracket 5, and the second shield 27 is attached to the second bracket 6. Are fixed respectively.
[0045]
As shown in FIGS. 5 and 6, both the first shield 26 and the second shield 27 have a cylindrical shape, and the diameter of the cylindrical body 18 of the first shield 26 and the diameter of the cylindrical body 18 a of the second shield 27 are both different. Are different from each other, and are sized so that the tip portions fit together. A flange 19 is formed continuously at the base end of each of the cylindrical bodies 18, 18a.
[0046]
The base end of the first shield 26 is fixed to the inner surface of the first bracket 5 using the flange 19, and the cylindrical body 18 passes through the gap 4 between the stator 2 and the rotor 3. I have. Similarly, the base end of the second shield 27 is fixed to the inner surface of the second bracket 6 using the flange 19, but the cylindrical body 18 a is outside the gap 4. The tip of the first shield 26 and the tip of the second shield 27 are fitted with each other.
[0047]
As a result, the gap between the inner surface of the first bracket 5 and the flange 19 of the first shield 26, the tip of the first shield 26 (cylindrical body 18) and the tip of the second shield 27 (cylindrical body 18a) are formed. Except for the gap between the fitted portions and the gap between the flange 19 of the second shield 27 and the inner surface of the second bracket 6, the gap 4 is between the first opening 14 and the second opening 15 of the frame 1. Is shielded. The coil ends 10 and 11 are located on the same side as the first open hole 14 and the second open hole 15 with respect to the first shield 26 and the second shield 27.
[0048]
Here, the cylindrical body 18 of the first shield 26 has a length and a thickness that penetrate the gap 4 between the stator 2 and the rotor 3. The second shield 27 has a length and thickness that allow the cylindrical main body 18a to be fitted with the cylindrical main body 18. 5 and 6, the cylindrical body 18a has a larger diameter than the cylindrical body 18, but the reverse is also possible.
[0049]
The thickness of the cylindrical body 18 may be arbitrarily set as long as its inner periphery does not contact the rotor 3. In this example, the outer diameter of the cylindrical body 18 is made as close to the inner diameter of the stator 2 as A large gap between the rotors 3 is ensured.
[0050]
To fix the first shield 26 and the second shield 27, a bolt hole 21 is formed in the flange 19, and the first shield 26 and the second shield 27 are fastened to the first bracket 5 and the second bracket 6 with the bolt 22. It is realized by.
[0051]
The gap between the first bracket 5 and the first shield 26 and the gap between the second shield 25 and the second bracket 6 are respectively sealed by a sealing member 23 such as an adhesive or a compound. By embedding these adhesives, compounds, and the like in the gaps, it is possible to prevent foreign substances from entering the gap 4, so that foreign substances can be prevented from entering the rotor 3. The work of filling these gaps with the sealing member 23 can be easily performed using the first open hole 14 and the second open hole 15 opened in the frame 1.
[0052]
The gap between the portions where the distal ends of the first shield 26 and the second shield 27 are fitted may be sealed with a sealing member 23 such as an adhesive or a compound. By attaching an O-ring (sealing member) 24, the gap is sealed. When sealing with the O-ring 28, the sealing operation is easy, and the length of the portion where the first shield 26 and the second shield 27 are fitted by sliding can be easily adjusted. Therefore, it is not necessary to seal the gap between the tip of the first shield 29 and the second shield 30 and the end of the stator 2.
[0053]
In this example, the base end of the first shield 26 is fixed to the first bracket 5 and the base end of the second shield 27 is fixed to the second bracket 6, respectively. The intended purpose can be achieved by forming the two opening holes 15 around the flange 19 with the first bracket 5 and the second bracket 6 instead of the one end and the other end of the frame 1. . The same effect can be obtained by opening the first open hole 14 and the second open hole 15 in the frame 1, the first bracket, and the second bracket.
[0054]
The following effects are obtained in the open-type PM motor according to the third embodiment.
(1) As in the first and second embodiments, the coil ends 10 and 11 can be directly cooled by the outside air through the first open hole 14 and the second open hole 15, so that the coil ends 10 and 11 can be compared with the conventional fully closed type. The temperature can be reduced, and the frame can be lowered.
(2) Even in the open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 26 and the second shield 27 as in the first and second embodiments. Therefore, it is possible to prevent foreign matter from entering the inside of the motor, and prevent a defect due to foreign matter entry.
(3) As in the first and second embodiments, the provision of the first shield 24 and the second shield 25 increases the cooling area and suppresses the temperature rise.
(4) The first shield 26 and the second shield 27 can be used even if the axial length of the motor (product allowance) changes. In other words, the first shield 26 and the second shield 27 are slid according to the stock of the motor, and the length of the fitting portion can be adjusted.
(5) Unlike the first and second embodiments, since the first shield 26 penetrates through the gap 4, the tip of the first shield 26 and the second shield 27 and the end face of the stator 2 are different. There is no need to seal the gap between the two.
[0055]
[Fourth embodiment]
FIG. 7 shows a cross-sectional structure of an open-type PM motor according to a fourth embodiment of the present invention, and FIG. 8 shows the appearance of a first shield 29 and a second shield 30 used in this open-type PM motor.
[0056]
The fourth embodiment is different from the third embodiment in the method of fixing the first shield 29 and the second shield 30.
[0057]
The basic structure of the PM motor is the same as that shown in FIGS. 1, 3, and 5. In FIG. 7, a stator 2 is mounted in a frame 1, and a rotor 3 using a permanent magnet is fixed via a gap 4. It is arranged inside the child 2. A first bracket 5 is attached to one end of the frame 1 and a second bracket 6 is attached to the other end. The shaft 7 of the rotor 3 is supported by a bearing 8 of the first bracket 5 and a bearing 9 of the second bracket 6. Reference numerals 10 and 11 are coil ends of the stator 2. The frame 1 has a first open hole 14 at one end thereof and a second open hole 15 at the other end thereof in order to form a PM open structure. The flow of outside air is indicated by arrows in the figure.
[0058]
In order to prevent foreign matter from entering the gap 4 from the first opening hole 14 and the second opening hole 15, the first shield 29 is fastened together with the frame 1 and the first bracket 5, and the second shield 29. The object 30 is also fastened to the frame 1 and the second bracket 6 simultaneously.
[0059]
As shown in FIGS. 7 and 8, the first shield 29 and the second shield 30 are both cylindrical, but the diameter of the cylindrical body 18 of the first shield 29 and the diameter of the cylindrical body 18 a of the second shield 30 are both different. Are different from each other, and are sized so that the tip portions fit together. A flange 19 is formed continuously at the base end of each of the cylindrical bodies 18, 18a. However, no bolt hole is formed in the flange 19.
[0060]
The base end of the first shield 29 is fastened and fixed simultaneously with the frame 1 and the first bracket 5 by inserting the flange 19 between the joining surfaces of the frame 1 and the first bracket 5. The cylindrical body 18 passes through the gap 4 between the stator 2 and the rotor 3. Similarly, the base end of the second shield 30 is fastened and fixed together with the frame 1 and the second bracket 6 by inserting the flange 19 between the joining surfaces of the frame 1 and the second bracket 6. However, the cylindrical body 18a is outside the gap 4. The tip of the first shield 29 and the tip of the second shield 30 are fitted to each other.
[0061]
As a result, the gap 4 and the first portion of the frame 1 are removed except for the gap between the tip of the first shield 29 (cylindrical body 18) and the tip of the second shield 30 (cylindrical body 18a). The space between the opening 14 and the second opening 15 is shielded. The coil ends 10 and 11 are located on the same side as the first open hole 14 and the second open hole 15 with respect to the first shield 29 and the second shield 30.
[0062]
Here, as in the third embodiment, the cylindrical body 18 of the first shield 29 has a length and a thickness that penetrate the gap 4 between the stator 2 and the rotor 3. Further, the second shield 30 has a length and a thickness that allow the cylindrical main body 18a to fit into the cylindrical main body 18. 7 and 8, the cylindrical body 18a has a larger diameter than the cylindrical body 18, but the reverse is also possible.
[0063]
The gap between the portions where the distal end portions of the first shield 29 and the second shield 30 are fitted may be sealed with a sealing member 23 such as an adhesive or a compound. For the same reason as in the embodiment, the gap is sealed by attaching an O-ring (sealing member) 28 to the gap.
[0064]
The open PM motor according to the fourth embodiment has the following effects.
(1) Similar to the first, second and third embodiments, since the coil ends 10 and 11 can be directly cooled by the outside air through the first opening hole 14 and the second opening hole 15, the conventional fully closed type is used. The temperature can be reduced and the frame can be lowered.
(2) Even in the case of the open type PM motor, the gap 4 is formed by the first shield hole 29 and the second shield member 30 as in the first, second and third embodiments. Since it is shielded from 15, it is possible to prevent foreign matter from entering the inside of the motor, and it is possible to prevent defects due to foreign matter entry.
(3) As in the first, second, and third embodiments, the provision of the first shield 29 and the second shield 30 increases the cooling area and suppresses the temperature rise.
(4) As in the third embodiment, the first shield 29 and the second shield 30 can be used even if the axial length (product allowance) of the motor changes. That is, the first shield 29 and the second shield 30 are slid according to the stock of the motor, and the length of the fitting portion can be adjusted.
(5) Since the first shield 29 penetrates through the gap 4, the gap between the distal end portions of the first shield 29 and the second shield 30 and the end face of the stator 2 is made similar to the third embodiment. There is no need to seal.
(6) Since the first shield 29 is fastened to the frame 1 and the first bracket 5 at the same time and the second shield 30 is fastened to the frame 1 and the second bracket 6 at the same time. In contrast, there is no need to seal the gap between the first shield 29 and the first bracket 5 and the gap between the second shield 30 and the second bracket 6.
[0065]
[Fifth Embodiment: Combination of First Embodiment and Second Embodiment]
Although not shown, the first shield 16 in FIG. 1 (first embodiment) is replaced with the first shield 24 in FIG. 3 (second embodiment), and the bolts 22 are attached to the first bracket 5 instead of the frame 1. 1 or the second shield 17 in FIG. 1 (first embodiment) is replaced with the second shield 25 in FIG. 3 (second embodiment), and the second bracket 6 is replaced with the frame 1. Can be configured to be fixed with bolts 22. This is achieved by replacing the first shield 24 in FIG. 3 (second embodiment) with the first shield 16 in FIG. 1 (first embodiment), and replacing the first bracket 5 with the bolt 22 or the bolt 1 on the frame 1. It is fixed by shrink fitting, or the second shield 25 in FIG. 3 (second embodiment) is replaced with the second shield 17 in FIG. 1 (first embodiment), and the second bracket 6 is replaced. This is equivalent to fixing to the frame 1 with bolts 22 or shrink fits.
[0066]
[Sixth Embodiment: Combination of Third Embodiment and Fourth Embodiment (Part 1)]
Although not shown, instead of replacing the first shield 26 in FIG. 5 (third embodiment) with the first shield 29 in FIG. 7 (fourth embodiment), the first shield 26 is fixed to the first bracket 5 with the bolts 22. , The frame 1 and the first bracket 5 can be simultaneously tightened and fixed. This is an alternative to replacing the second shield 30 in FIG. 7 (fourth embodiment) with the second shield 27 in FIG. 5 (third embodiment) and simultaneously fastening the frame 1 and the second bracket 6 together. In addition, it is equivalent to fixing to the second bracket 6 with the bolt 22.
[0067]
[Seventh Embodiment: Combination of Third and Fourth Embodiments (Part 2)]
Although not shown, contrary to the sixth embodiment, the second shield 27 in FIG. 5 (third embodiment) is replaced with the second shield 30 in FIG. 7 (fourth embodiment), and the second bracket Instead of fixing to the frame 6 with the bolts 22, the frame 1 and the second bracket 6 can be simultaneously fastened and fixed together. This is an alternative to replacing the first shield 29 in FIG. 7 (fourth embodiment) with the first shield 26 in FIG. 5 (third embodiment) and simultaneously fastening the frame 1 and the first bracket 5 together. In addition, it is equivalent to fixing to the first bracket 5 with the bolt 22.
[0068]
[Eighth embodiment]
FIG. 9 shows a sectional structure of an open-type PM motor according to an eighth embodiment of the present invention, and FIG. 10 shows a sectional view of a stator.
[0069]
The basic structure of the PM motor is the same as that of the third embodiment shown in FIG. A large number of grooves 31 are radially formed on the inner periphery of the stator 2. A coil 32 is provided on the radially outer side in the groove 31 and is held by a partition plate 33. The space in the groove 31 in which the coil 32 is accommodated is called a coil passage 34. A portion surrounded by the partition plate 33, the first shield 26, and the groove portion 31 (hereinafter, the stator tooth portion 2a) is adjacent to the coil passage 34 to form an outside air passage 35 through which outside air passes. The outside air entering through the first opening hole 14 is divided into one that passes through the gap 36 between the frame 1 and the stator 2 and one that passes through the outside air passage 35. These two flows of outside air finally flow out of the second opening hole 15. In FIG. 9, the flow of outside air is indicated by arrows.
[0070]
Such an open PM motor according to the eighth embodiment has the following effects.
(1) As in the first to seventh embodiments, the coil ends 10 and 11 can be directly cooled by the outside air through the first open hole 14 and the second open hole 15, so that the coil ends 10 and 11 can be compared with the conventional fully closed type. The temperature can be reduced, and the frame can be lowered.
(2) Even in the open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 26 and the second shield 27 as in the first to seventh embodiments. Therefore, it is possible to prevent foreign matter from entering the inside of the motor, and prevent a defect due to foreign matter entry.
(3) As in the first to seventh embodiments, the provision of the first shield 24 and the second shield 25 increases the cooling area and suppresses the temperature rise.
(4) The first shield 26 and the second shield 27 can be used even if the axial length of the motor (product allowance) changes. In other words, the first shield 26 and the second shield 27 are slid according to the stock of the motor, and the length of the fitting portion can be adjusted.
(5) Unlike the first, second, and fifth embodiments, since the first shield 26 penetrates the gap 4, the tip of the first shield 26 and the second shield 27 and the stator There is no need to seal the gap with the end face of the second.
(6) Since the outside air ventilation passage 35 is provided, the stator 2 and the coil 32 can be directly cooled, so that the temperature can be reduced as compared with the conventional fully closed type.
[0071]
[Ninth embodiment]
FIG. 11 shows a sectional structure of an open-type PM motor according to a ninth embodiment of the present invention, and FIG. 12 shows a sectional view of a stator.
[0072]
The basic structure of the PM motor is the same as that of the fourth embodiment shown in FIG. A groove is machined along the axial direction at the portion between the adjacent stator grooves 31 in the stator 2, that is, at the tip of the stator teeth 2a. This groove surrounded by the stator teeth 2a and the first shield 29 is defined as an outside air passage 37 through which outside air passes. The stator 2 is composed of laminated iron plates 2b. This laminated iron plate 2b is divided into several parts, and a spacer 38 is arranged between each divided laminated iron plate 2b. A portion surrounded by the two laminated iron plates 2b and the spacer 38 therebetween serves as a second outside air passage 39 through which outside air passes. Since the spacer 38 is provided to provide a gap between the laminated iron plates 2b and allow the outside air to flow, it is not necessary to form the spacer into a ring shape like the laminated iron plate 2b. The outside air entering through the first opening hole 14 is divided into one that passes through the gap 36 between the frame 1 and the stator 2 and one that passes through the outside air passage 37. These two flows of outside air finally flow out of the second opening hole 15. In some cases, the outside air that has passed through the gap 36 passes through the outside air passage 39 and joins the outside air passage 37. In FIG. 11, the flow of outside air is indicated by arrows.
[0073]
The following effects are obtained in the open type PM motor according to the ninth embodiment.
(1) As in the first to eighth embodiments, the coil ends 10 and 11 can be directly cooled by the outside air through the first open hole 14 and the second open hole 15, so that the coil ends 10 and 11 can be cooled as compared with the conventional fully closed type. The temperature can be reduced, and the frame can be lowered.
(2) Even in the case of the open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 29 and the second shield 30 as in the first to eighth embodiments. Therefore, it is possible to prevent foreign matter from entering the inside of the motor, and prevent a defect due to foreign matter entry.
(3) As in the first to eighth embodiments, the provision of the first shield 29 and the second shield 30 increases the cooling area and suppresses the temperature rise.
(4) As in the third, fourth, sixth, seventh, and eighth embodiments, the first shield 29 and the second shield 30 may change even if the axial length of the motor (product allowance) changes. Can be used. That is, the first shield 29 and the second shield 30 are slid according to the stock of the motor, and the length of the fitting portion can be adjusted.
(5) Since the first shield 29 penetrates through the gap 4, the first shield 29 and the second shield 30 are similar to the third, fourth, sixth, seventh, and eighth embodiments. There is no need to seal the gap between the tip and the end face of the stator 2.
(6) Since the first shield 29 is fastened to the frame 1 and the first bracket 5 at the same time and the second shield 30 is fastened to the frame 1 and the second bracket 6 at the same time, the third and the eighth are used. Unlike the embodiment, there is no need to seal the gap between the first shield 29 and the first bracket 5 and the gap between the second shield 30 and the second bracket 6.
(7) Since the stator 2 and the coil 32 can be directly cooled by providing the outside air passages 37 and 39, the temperature can be reduced as compared with the conventional fully closed type.
[0074]
[Tenth Embodiment: Combination of Eighth and Ninth Embodiments]
FIG. 13 shows a sectional structure of an open-type PM motor according to a tenth embodiment of the present invention, and FIG. 14 shows a sectional view of a stator. This embodiment is a combination of the eighth and ninth embodiments.
[0075]
The basic structure of the PM motor is the same as that of the fourth embodiment shown in FIG. The stator groove 31 has the same structure as the eighth embodiment, and the stator teeth 2a have the same structure as the ninth embodiment. A large number of grooves 31 are radially formed on the inner periphery of the stator 2. A coil 32 is provided on the radially outer side in the groove 31, and is held by a partition plate 33. The space in the groove 31 in which the coil 32 is accommodated is called a coil passage 34. A portion surrounded by the partition plate 33, the first shield 29, and the stator teeth 2a is an outside air passage 35 through which outside air passes so as to be adjacent to the coil passage 34. A groove is machined along the axial direction at the portion between the adjacent stator grooves 31 in the stator 2, that is, at the tip of the stator teeth 2a. This groove surrounded by the stator teeth 2a and the first shield 29 is defined as an outside air passage 37 through which outside air passes. The stator 2 is composed of laminated iron plates 2b. This laminated iron plate 2b is divided into several parts, and a spacer 38 is arranged between each divided laminated iron plate 2b. A portion surrounded by the two laminated iron plates 2b and the spacer 38 therebetween is defined as a second outside air passage 39 through which outside air passes.
[0076]
The outside air entering through the first opening hole 14 is divided into one that passes through the gap 36 between the frame 1 and the stator 2, one that passes through the outside air passage 35, and one that passes through the outside air passage 37. These finally flow out of the second opening hole 15. In some cases, the outside air that has passed through the gap 36 passes through the outside air passage 39 and joins the outside air passage 35 and the outside air passage 37. In FIG. 13, the flow of outside air is indicated by arrows.
[0077]
The following effects are obtained in the open type PM motor according to the ninth embodiment.
(1) As in the first to eighth embodiments, the coil ends 10 and 11 can be directly cooled by the outside air through the first open hole 14 and the second open hole 15, so that the coil ends 10 and 11 can be cooled as compared with the conventional fully closed type. The temperature can be reduced, and the frame can be lowered.
(2) Even in the case of the open type PM motor, the gap 4 is shielded from the first open hole 14 and the second open hole 15 by the first shield 29 and the second shield 30 as in the first to eighth embodiments. Therefore, it is possible to prevent foreign matter from entering the inside of the motor, and prevent a defect due to foreign matter entry.
(3) As in the first to eighth embodiments, the provision of the first shield 29 and the second shield 30 increases the cooling area and suppresses the temperature rise.
(4) As in the third, fourth, sixth, seventh, and eighth embodiments, the first shield 29 and the second shield 30 may change even if the axial length of the motor (product allowance) changes. Can be used. That is, the first shield 29 and the second shield 30 are slid according to the stock of the motor, and the length of the fitting portion can be adjusted.
(5) Since the first shield 29 penetrates through the gap 4, the first shield 29 and the second shield 30 are similar to the third, fourth, sixth, seventh, and eighth embodiments. There is no need to seal the gap between the tip and the end face of the stator 2.
(6) Since the first shield 29 is fastened to the frame 1 and the first bracket 5 at the same time and the second shield 30 is fastened to the frame 1 and the second bracket 6 at the same time, the third and the eighth are used. Unlike the embodiment, there is no need to seal the gap between the first shield 29 and the first bracket 5 and the gap between the second shield 30 and the second bracket 6.
(7) Since the stator 2 and the coil 32 can be directly cooled by providing the outside air passages 35, 37, and 39, the temperature can be reduced as compared with the conventional fully closed type.
[0078]
【The invention's effect】
As described in detail above, the present invention has the following effects.
(1) In both the first invention to the eleventh invention, the PM motor is formed into an open shape in which the first open hole and the second open hole are formed in the frame, so that the PM motor is directly exposed to outside air through the first open hole and the second open hole. Since the coil end can be cooled, the temperature can be reduced and the frame can be lowered as compared with the conventional fully-closed PM motor. Since the first open hole and the second open hole are open in the frame of the PM motor, the coil end can be directly cooled by outside air through the first open hole and the second open hole. The temperature can be reduced as compared with the motor.
(2) Even in the case of the open type PM motor, the gap is shielded from the first open hole and the second open hole by the first shield and the second shield in all of the first to eleventh inventions. Similarly, foreign matter can be prevented from entering the inside of the motor, and the occurrence of a defect due to foreign matter can be prevented.
(3) Since both the first invention to the eleventh invention include the first shield and the second shield, the cooling area increases, and the temperature rise can be suppressed.
(4) In the third invention to the fourth invention and the sixth invention to the eleventh invention, since the first shield and the second shield are fitted together at the tips, the axial length of the motor (product allowance). It can be used even if changes.
(5) In the third invention to the fourth invention and the sixth invention to the eleventh invention, since the first shield penetrates through the gap 4, the end portions of the first shield and the second shield and the end face of the stator are disposed. There is no need to seal the gap.
(6) In the fourth aspect, the first shield is fastened to the frame and the first bracket at the same time, and the second shield is fastened to the frame and the second bracket at the same time. There is no need to seal the gap between them and the gap between the second shield and the second bracket. This effect can be applied to the equivalent parts in the sixth to eleventh inventions.
(7) In the eighth aspect, the gap between the portions where the distal ends of the first shield and the second shield are fitted with each other is sealed with the O-ring, so that the sealing operation is easy. Further, the length of the portion where the first shield and the second shield are fitted can be easily adjusted, so that it is possible to easily cope with a change in the axial length (stock allowance) of the motor. .
(8) In the ninth invention, by providing an outside air ventilation passage in the stator groove. The stator and coil can be cooled directly. The cooling area increases, and the temperature can be reduced as compared with the conventional fully closed type.
(9) In the tenth invention, the inside of the stator and the coil can be directly cooled by forming the outside air ventilation path by sandwiching the spacer between the laminated iron plates. Further, since the cooling performance is improved as compared with the conventional fully closed type, the motor can be downsized.
(10) In the eleventh invention, the stator can be directly cooled by forming the outside air ventilation passage at the tip of the stator tooth portion.
[Brief description of the drawings]
FIG. 1 is a sectional view of the upper half of an open-type PM motor according to a first embodiment of the present invention.
FIG. 2 is an external view of a first shield and a second shield used in the first embodiment.
FIG. 3 is a sectional view of an upper half of an open type PM motor according to a second embodiment of the present invention.
FIG. 4 is an external view of a first shield and a second shield used in the second embodiment.
FIG. 5 is a sectional view of an upper half of an open-type PM motor according to a third embodiment of the present invention.
FIG. 6 is an external view of a first shield and a second shield used in the third embodiment.
FIG. 7 is a sectional view of an upper half of an open-type PM motor according to a fourth embodiment of the present invention.
FIG. 8 is an external view of a first shield and a second shield used in the fourth embodiment.
FIG. 9 is a sectional view of the upper half of an open-type PM motor according to an eighth embodiment of the present invention.
FIG. 10 is a sectional view of a stator used in an eighth embodiment.
FIG. 11 is a sectional view of the upper half of an open-type PM motor according to a ninth embodiment of the present invention.
FIG. 12 is a sectional view of a stator used in the ninth embodiment.
FIG. 13 is a sectional view of an upper half of an open-type PM motor according to a tenth embodiment of the present invention.
FIG. 14 is a sectional view of a stator used in the tenth embodiment.
[Explanation of symbols]
One frame
2 Stator
2a Stator teeth
2b laminated iron plate
3 Rotor using permanent magnet (PM)
4 gap
5 First bracket
6 Second bracket
7 Rotor shaft
8, 9 Bearing
10, 11 Coil end
12 Connection between frame and first bracket
13 Connection between frame and second bracket
14 First open hole
15 Second open hole
16 First shield (first embodiment)
17 Second shield (first embodiment)
18 Cylindrical body
18a cylindrical body
19 Flange
20 cylindrical part
21 bolt holes
22 volts
23 Sealing members (adhesives, compounds, etc.)
24 First Shield (Second Embodiment)
25 Second shield (second embodiment)
26 First Shield (Third Embodiment)
27 Second shield (third embodiment)
28 O-ring
29 First Shield (Fourth Embodiment)
30 Second shield (fourth embodiment)
31 Stator groove
32 coils
33 Partition plate
34 Coil passage
35 Outside air passage
36 gap
37 Outside air passage
38 Spacer
39 Open air passage

Claims

A frame having a first open hole formed on one end side and a second open hole formed on the other end side; and a base end fixed to an inner surface of the frame closer to one end than the first open hole, and a distal end fixed. A first cylindrical shield reaching one end face closer to the rotor than the coil end of the child, and a base end portion is fixed to an inner surface of the frame closer to the other end than the second open hole, and a distal end portion is fixed. A cylindrical second shield reaching the other end face closer to the rotor than the coil end of the stator, a gap between the first shield and the frame, a gap between the first shield and the stator, a second shield And a sealing member that seals a gap between the frame and a gap between the second shield and the stator.

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A first shield having a cylindrical end fixed to the inner surface of the first bracket, a distal end reaching one end of the stator closer to the rotor than the coil end, and a proximal end attached to the inner surface of the second bracket. A second cylindrical shield having a fixed end and a distal end reaching the other end of the stator closer to the rotor than the coil end; a gap between the first shield and the first bracket; An open-type PM motor, comprising: a sealing member that seals a gap between the stator, a gap between the second shield and the second bracket, and a gap between the second shield and the stator.

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A base end portion fixed to an inner surface of the first bracket, a cylindrical first shield penetrating a gap surface between the stator and the rotor, and a base end portion fixed to an inner surface of the second bracket; A second shield having a cylindrical shape in which the shield and the tip end are fitted to each other; a gap between the first shield and the first bracket; a gap in a portion where the first shield and the second shield are fitted; An open-type PM motor, comprising: a sealing member that seals a gap between the second shield and the second bracket.

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A base end portion fastened to the frame and the first bracket, a cylindrical first shield penetrating a gap surface between the stator and the rotor, and a base end portion fastened to the frame and the second bracket; A second shield having a cylindrical shape in which the first shield and the tip end are fitted to each other; and a sealing member for sealing a gap between a portion where the first shield and the second shield are fitted. An open-type PM motor, comprising:

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A cylindrical first shielding member having a base end fixed to an inner surface of the frame closer to one end than the first open hole, and a distal end reaching one end of the stator closer to the rotor than the coil end; A cylindrical second shield having a base end portion fixed to the inner surface of the second bracket and a distal end portion reaching the other end surface of the stator closer to the rotor than the coil end, and between the first shield and the frame. A sealing member for sealing the gap, the gap between the first shield and the stator, the gap between the second shield and the second bracket, and the gap between the second shield and the stator, respectively. Open PM motor.

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A base end portion fastened to an inner surface of the first bracket, a first cylindrical shield penetrating a gap surface between the stator and the rotor, and a base end portion fixed to an inner surface of the second bracket; (1) a cylindrical second shield in which the distal end portion is fitted with the first shield, a gap between a portion where the first shield and the second shield are fitted, and a gap between the second shield and the second bracket And an encapsulating member for enclosing the PM motor.

A frame having a first opening on one end and a second opening on the other end; a first bracket attached to one end of the frame; and a second bracket attached to the other end of the frame. A base end portion fixed to the inner surface of the first bracket, a cylindrical first shield that penetrates a gap surface between the stator and the rotor, and a base end portion fastened to the inner surface of the second bracket, (1) a cylindrical second shield in which the first shield and the tip end are fitted to each other; a gap between the first shield and the first bracket; and a gap in a portion where the first shield and the second shield are fitted. And an encapsulating member for enclosing the PM motor.

8. The open-type PM motor according to claim 3, wherein a sealing member for sealing a gap between a portion where the first shield and the second shield are fitted is an O-ring. .

The open-type PM motor according to claim 3, wherein an outside air passage is provided adjacent to the groove of the stator.

The open type PM according to claim 3, wherein the laminated iron plate constituting the stator is divided into a plurality of parts, and the divided laminated iron plates are laminated via a spacer. motor.

The open-type PM motor according to claim 10, wherein a second external air passage is provided in an inner peripheral portion between the external air passages in the laminated iron plate.