JP3960220B2

JP3960220B2 - Assembling method of the magnetic stator of the rotating electrical machine

Info

Publication number: JP3960220B2
Application number: JP2002364066A
Authority: JP
Inventors: 誠司渡辺
Original assignee: Denso Corp
Current assignee: Denso Corp
Priority date: 2002-12-16
Filing date: 2002-12-16
Publication date: 2007-08-15
Anticipated expiration: 2022-12-16
Also published as: JP2004201370A

Description

【０００１】
【発明の属する技術分野】
本発明は、回転電機における磁石式固定子の組付け方法に関する。
【０００２】
【従来の技術】
従来技術として、磁石式固定子を有する回転電機では、図２に示す様に、周方向に隣合う磁石３同士の間に、金属板を略コの字状に折り曲げて形成された固定部材４を配置し、この固定部材４の弾力を利用してヨーク２に磁石３を固定する方法が知られている（例えば、特許文献１参照）。
この固定部材４を用いた磁石３の組付け方法を図１０〜図１３に基づいて説明する。
ａ）先ず、図１０（ａ）に示す様に、所定数の固定部材４をダミー治具100 にセットし、更に所定数の磁石３を周方向に隣合う固定部材４間にセットする。この時、固定部材４は、一組の側片部４ｂを内側に押し縮めた状態でダミー治具100 にセットされる。
【０００３】
ｂ）続いて、図１１に示す様に、ヨーク２の内側にダミー治具100 を挿入して所定位置にセットする。
ｃ）続いて、図１２に示す様に、ダミー治具100 に設けられた押し出し部110 を径方向外側へ押し出して、固定部材４をヨーク２の所定位置に組み付ける。これにより、固定部材４の側片部４ｂが弾力を有して磁石３の側面に押し当てられることにより、ヨーク２の内周面に磁石３が押し付けられた状態で固定される。ｄ）最後に、図１３に示す様に、ヨーク２からダミー治具100 を取り出して、磁石３の組み付けを完了する。
【０００４】
【特許文献１】
特願2002-10591
【０００５】
【発明が解決しようとする課題】
ところが、上記のダミー治具100 を用いた組付け方法では、ダミー治具100 に仮組みした固定部材４を径方向外側へ押し出してヨーク２に組み付けているため、ダミー治具100 に仮組みされた固定部材４は、実際にヨーク２へ組み付けられた状態より、固定部材４の側片部４ｂを必要以上に押し縮める必要がある。その結果、図１０（ｂ）に示す様に、固定部材４の背板部４ａが変形する虞があり、この状態でダミー治具100 から押し出された場合、固定部材４の弾力が大幅に低減するため、磁石３を強固に固定することができなくなる。
【０００６】
また、ダミー治具100 にセットした状態で固定部材４の側片部４ｂを必要以上に押し縮めるため、側片部４ｂに付与される弾力が必要以上に増大し、固定部材４をダミー治具100 から押し出した時に、側片部４ｂが磁石３に強く当たり、更にヨーク２の内周面に磁石３が強く押し付けられる。このため、側片部４ｂが磁石３に当たった時の衝撃、あるいは磁石３がヨーク２の内周面に押し付けられた時の衝撃により、磁石３に割れや欠け等の損傷を生じる虞があった。
本発明は、上記事情に基づいて成されたもので、その目的は、固定部材の変形および磁石の損傷を防止できる回転電機の磁石式固定子の組付け方法を提供することにある。
【０００７】
【課題を解決するための手段】
（請求項１の発明）
本発明は、磁性材料から成る円筒状のヨークと、このヨークの内側周方向に等間隔に配置される複数の磁石と、周方向に隣合う磁石同士の間にそれぞれ配置され、自身の両隣りに配置される磁石の側面に当接する一組の側片部を有し、この側片部に弾力を持たせて磁石を周方向および径方向外側へ押し付けることにより、磁石をヨークに固定する複数の固定部材とを備えた回転電機の磁石式固定子の組付け方法であって、ヨーク内周面の所定位置に固定部材をセットする第１工程と、周方向に隣合う固定部材間に治具を挿入し、その治具により固定部材の側片部を周方向に押圧して弾性変形させる（押し縮める）ことにより、周方向に隣合う固定部材間に磁石を挿入できる寸法を確保する第２工程と、周方向に隣合う固定部材間に磁石を挿入すると共に、その磁石の挿入動作に同調して治具をヨーク内から後退させる第３工程とを有することを特徴とする。このようにして、ヨーク内周面の所定位置に複数の固定部材をセットした後、周方向に隣合う固定部材間に磁石を挿入して所定位置に組み付けることを特徴とする。
【０００８】
この方法によれば、ヨークの内周面に固定部材をセットしてから磁石を組み付けるので、周方向に隣合う固定部材間に磁石を挿入する際に、その周方向に隣合う固定部材間の寸法を必要以上に大きくする必要がない。つまり、周方向に隣合う固定部材間（側片部同士の間）には、磁石を挿入できる最小限の寸法（磁石の周方向幅と略同等）が確保されれば良いので、治具により固定部材の側片部を周方向に押圧する際に、必要以上に側片部を押し縮める必要がない。つまり、第２工程にて、側片部を周方向に押圧して弾性変形させる変形量は、磁石を組み付けた後の変形量と同程度で良いため、必要最小限の変形量で良い。
この結果、固定部材の変形を防止できるだけでなく、磁石を挿入する際に、固定部材の側片部が磁石に衝撃を与えることはなく、且つ磁石がヨークの内周面に過大な力で押し付けられることもないので、磁石の割れ、欠け等の損傷を防止できる。
【００１１】
（請求項２の発明）
請求項１に記載した回転電機の磁石式固定子の組付け方法において、
第２工程では、磁石を挿入する固定部材間の入口付近のみ、治具により側片部を周方向に押圧して、磁石を挿入できる寸法を確保することを特徴とする。
磁石を挿入する固定部材間の入口付近から離れた位置で側片部を押圧した場合には、入口付近で側片部を押圧した場合と同程度の力で側片部を押圧しても、入口付近では磁石を挿入できる寸法を確保することができない。このため、固定部材間の入口で磁石を挿入できる寸法を確保しようとすると、入口付近で側片部を押圧した場合より大きな押圧力が必要となり、側片部の弾性変形量が大きくなるため、固定部材が変形する虞がある。
【００１２】
これに対し、本発明では、磁石を挿入する固定部材間の入口付近のみ側片部を周方向に押圧するので、固定部材間の入口付近のみ磁石を挿入できる寸法を確保できる。その結果、必要最低限の押圧力で良く、側片部の弾性変形量を必要最小限に抑えることができるので、固定部材の変形を防止できる。
【００１３】
（請求項３の発明）
請求項１または２に記載した回転電機の磁石式固定子の組付け方法において、
治具は、第２工程で固定部材の側片部を押圧する際に固定部材の側片部に当接する当接面を有する治具頭部と、この治具頭部を支持するアーム部とを備え、治具頭部がアーム部と分割して設けられ、且つアーム部に着脱可能に取り付けられていることを特徴とする。
【００１４】
本発明に用いられる治具は、固定部材の側片部に当接する当接面が、繰り返しの使用により摩耗すると、側片部を押圧して押し縮める量（弾性変形量）が不十分となり、磁石の挿入が困難になるため、定期的な交換が必要となる。
これに対し、当接面を有する治具頭部と、この治具頭部を支持するアーム部とを分割構造とし、且つ治具頭部をアーム部に着脱可能とすることにより、当接面が摩耗した時には、治具頭部のみをアーム部から取り外して交換することができる。この場合、治具頭部がアーム部と一体構造を有するものと比較すると、交換に必要な部品代が安価であり、且つ交換作業も容易で短時間に終えることができるため、生産性の向上を図ることが可能である。
【００１５】
（請求項４の発明）
請求項１に記載した回転電機の磁石式固定子の組付け方法において、
第３工程では、周方向に隣合う固定部材間に磁石を挿入する際に、その磁石の挿入方向先端面を治具に押し当てながら挿入動作を実施することにより、磁石の挿入方向に治具が押し出されることを特徴とする。
この構造では、磁石の挿入動作に同調して治具を押し出すことができるので、治具を押し出すための専用の機構が不要であり、簡単且つ安価な治具を提供することが可能である。
【００１６】
（請求項５の発明）
請求項１に記載した回転電機の磁石式固定子の組付け方法において、
周方向に隣合う固定部材間に磁石を挿入する際に、ヨークおよび固定部材と最初に接触する磁石の角部に面取りまたはＲ形状を設けたことを特徴とする。
この構成によれば、磁石を挿入する際に、磁石とヨークおよび固定部材との接触抵抗が減少するため、磁石の挿入動作を容易に行うことができる。また、磁石の挿入位置がヨークの径方向および周方向に多少ずれていても、磁石の角部に設けられた面取りまたはＲ形状によって磁石の位置が矯正されるので、磁石がヨークおよび固定部材に乗り上げたり、引っ掛かったりすることを防止できる。その結果、滑らかな磁石の挿入が可能となり、磁石の割れや欠け等を防止できる。
【００１７】
（請求項６の発明）
請求項４に記載した回転電機の磁石式固定子の組付け方法において、
治具は、磁石の挿入方向先端面が押し当てられる磁石受け面を有し、この磁石受け面に磁石より軟らかい部材が取り付けられていることを特徴とする。
この構成によれば、磁石の先端面（挿入方向先端面）を治具に押し当てながら挿入動作を実施する際に、磁石の先端面と治具の磁石受け面との間に磁石より軟らかい部材が介在されるため、磁石の先端面と治具の磁石受け面とが直接的に強く当たることがなく、磁石の先端面を治具の磁石受け面に押し当てた時の衝撃を抑えることができる。その結果、衝撃による磁石の割れや欠け等の損傷を防止できる。
【００１８】
【発明の実施の形態】
次に、本発明の実施形態を図面に基づいて説明する。
図１は磁石式固定子の組付け方法を示す斜視図である。
本実施形態の回転電機は、例えば内燃機関を始動するためのスタータに用いられる始動用モータであり、界磁を形成する磁石式固定子（以下、固定子１と呼ぶ）を備える。
その固定子１は、図２に示す様に、磁性材料から成る円筒状のヨーク２と、このヨーク２の内側周方向に等間隔に配置される６個の磁石３と、周方向に隣合う磁石３間に配置されて、個々の磁石３をヨーク２に固定する６個の固定部材４とで構成される。
【００１９】
磁石３は、図２に示す様に、ヨーク２の半径方向にＳ極とＮ極が現れる様に着磁され、且つ周方向に隣合う磁石３同士の磁極が異なる様に着磁されている。
固定部材４は、図３に示す様に、弾性を有する金属板（例えばステンレス板）を略コの字状に折り曲げて形成された背板部４ａと一組の側片部４ｂとを有し、この側片部４ｂに弾力を持たせて、隣接する磁石３を周方向および径方向外側へ押圧することにより、ヨーク２の内周面に磁石３を押し付けて固定するものである。
【００２０】
次に、固定子１の組付け方法を説明する。
（第１実施例）
第１工程…６個の固定部材４をヨーク２の内周面の所定位置に押し付けた状態で保持する。この時、ヨーク２の内周面には、位置決め用の突起（図示しない）が設けられており、一方、固定部材４の背板部４ａには、嵌合穴（図示しない）が形成され、この嵌合穴をヨーク２の突起に嵌め合わせることで、ヨーク２の周方向および軸方向に対する固定部材４の位置決めが行われる。
【００２１】
第２工程…周方向に隣合う固定部材４間に治具５が挿入され、その治具５を周方向にスライドさせて固定部材４の側片部４ｂを押圧することにより、側片部４ｂを周方向に弾性変形させて、隣合う固定部材４間に磁石３を挿入できる寸法を確保する。
第３工程…図１に示す様に、ヨーク２の上方側から周方向に隣合う固定部材４間に磁石３を挿入すると共に、その磁石３の挿入動作に同調して治具５をヨーク２内から後退させる。この時、治具５は、周方向に隣合う固定部材４間に磁石３を挿入できる寸法を確保しながら、磁石３の挿入動作に同調して下方へ押し下げられる。
【００２２】
（第１実施例の効果）
本実施例によれば、ヨーク２の内周面に固定部材４をセットした状態で磁石３を組み付けるので、周方向に隣合う固定部材４間に磁石３を挿入する際に、その隣合う固定部材４間に磁石３を挿入できる寸法を確保できれば良い。従って、治具５により固定部材４の側片部４ｂを押圧して弾性変形させる際に、その変形量は、磁石３をヨーク２に組み付けた後の変形量と同程度で良いため、側片部４ｂの変形量を必要最小限に抑えることができる。その結果、固定部材４の変形を防止できるだけでなく、磁石３を挿入する際に、固定部材４の側片部４ｂが磁石３に衝撃を与えることはなく、且つ磁石３がヨーク２の内周面に過大な力で押し付けられることもないので、磁石３の割れ、欠け等の損傷を防止できる。
【００２３】
（第２実施例）
図４は第１実施例に記載した第２工程の説明図である。
第２工程で使用される治具５は、図４に示す様に、固定部材４の側片部４ｂを押圧する治具頭部５ａが段付き状に突出して設けられ、その治具頭部５ａにより、側片部４ｂの図示上端部（周方向に隣合う固定部材４間に磁石３を挿入する時の入口付近）のみを押圧する様に構成されている。
【００２４】
この場合、周方向に隣合う固定部材４間に磁石３を挿入できる寸法を確保するために、固定部材４の側片部４ｂを弾性変形させるための押圧力を必要最低限に抑えることができる。言い換えると、磁石３を挿入する固定部材４間の入口付近のみ固定部材４の側片部４ｂを押圧して弾性変形させれば良いので、側片部４ｂの変形量を必要最小限（磁石３を組み付けた後の変形量と同程度）に抑えることができ、固定部材４の変形を防止できる。
【００２５】
これに対し、例えば図５に示す様に、磁石３を挿入する固定部材４間の入口付近から離れた位置で側片部４ｂを押圧した場合には、入口付近で側片部４ｂを押圧した場合と同程度の力で側片部４ｂを押圧しても、入口付近では磁石３を挿入できる寸法を確保することができない。このため、固定部材４間の入口で磁石３を挿入できる寸法を確保しようとすると、入口付近で側片部４ｂを押圧した場合より大きな押圧力が必要となり、側片部４ｂの弾性変形量が大きくなるため、固定部材４が変形する虞がある。
【００２６】
（第３実施例）
図６は第１実施例に記載した第２工程で使用される治具５の斜視図である。
本実施例の治具５は、図６に示す様に、第２工程で固定部材４の側片部４ｂを押圧する際に、その側片部４ｂに当接する当接面を有する治具頭部５ａと、この治具頭部５ａを支持するアーム部５ｂとを備え、治具頭部５ａがアーム部５ｂと分割して設けられ、且つアーム部５ｂに対し螺子６等により着脱可能に取り付けられている。
【００２７】
第２工程で使用される治具５は、固定部材４の側片部４ｂに当接する当接面が繰り返しの使用により摩耗してくると、側片部４ｂを押圧して押し縮める量（弾性変形量）が不十分となり、磁石３の挿入が困難になるため、定期的な交換が必要となる。
これに対し、治具頭部５ａとアーム部５ｂとを分割構造とし、且つ治具頭部５ａをアーム部５ｂに着脱可能とすることにより、当接面が摩耗した時には、治具頭部５ａのみをアーム部５ｂから取り外して交換することができる。この場合、治具頭部５ａがアーム部５ｂと一体構造を有する治具と比較すると、交換に必要な部品代が安価であり、且つ交換作業も容易で短時間に終えることができるため、生産性の向上を図ることが可能である。
【００２８】
（第４実施例）
図７は第１実施例に記載した第３工程の説明図である。
固定部材４の側片部４ｂを押圧するための治具５は、図７に示す様に、スプリング７により図示上方へ押し上げられており、磁石３の挿入時に、磁石３の下端面が治具頭部５ａの上端面に当接する。この後、スプリング７の反力より大きい荷重で磁石３を押し込むことにより、図示矢印で示す様に、磁石３の挿入動作に同調して治具５が押し出され、磁石３が所定位置まで挿入された時点で、固定部材４から治具５が離脱する。
この構成によれば、磁石３の挿入動作に同調して治具５を押し出すことができるので、治具５を押し出すための専用の機構が不要であり、簡単且つ安価な治具５を提供することが可能である。
【００２９】
（第５実施例）
図８は磁石３の端面を示す平面図（ａ）、及び内径側から見た平面図（ｂ）である。
本実施例では、図８に示す様に、磁石３の角部に面取りまたはＲ形状を設けたことを特徴とする。この構成によれば、第３工程にて磁石３を挿入する際に、磁石３とヨーク２および固定部材４との接触抵抗が減少するため、磁石３の挿入動作を容易に行うことができる。
【００３０】
また、磁石３の挿入位置がヨーク２の径方向および周方向に多少ずれていても、磁石３の角部に設けられた面取りまたはＲ形状によって磁石３の位置が矯正されるので、磁石３がヨーク２および固定部材４に乗り上げたり、引っ掛かったりすることを防止できる。その結果、滑らかな磁石３の挿入が可能となり、磁石３の割れや欠け等を防止できる。なお、磁石３の全ての角部に面取りまたはＲ形状を設けても良いが、磁石３の挿入時にヨーク２および固定部材４と最初に接触する角部のみに面取りまたはＲ形状を設けても良い。
【００３１】
（第６実施例）
図９は治具５の斜視図である。
本実施例では、第３工程にて磁石３を挿入する際に、その磁石３の下端面が当接する治具５の磁石受け面に、磁石３より軟らかい部材８（例えば樹脂板）を取り付けたことを特徴とする。
この構成によれば、磁石３の下端面（挿入方向先端面）を治具５に押し当てながら挿入動作を実施する際に、磁石３の下端面と治具５の磁石受け面との間に磁石３より軟らかい部材８が介在されるため、磁石３の下端端面と治具５の磁石受け面とが直接的に強く当たることがなく、磁石３の下端面を治具５の磁石受け面に押し当てた時の衝撃を抑えることができる。その結果、衝撃による磁石３の割れや欠け等の損傷を防止できる。
【図面の簡単な説明】
【図１】磁石式固定子の組付け方法を示す斜視図である。
【図２】磁石式固定子の軸方向正面図である。
【図３】固定部材の斜視図である。
【図４】第２工程の説明図である。
【図５】第２工程の比較例を示す図面である。
【図６】治具の斜視図である。
【図７】第３工程の説明図である。
【図８】磁石の端面を示す平面図（ａ）と、内径側から見た平面図（ｂ）である。
【図９】治具の斜視図である。
【図１０】磁石式固定子の組付け方法を示す説明図である（従来技術）。
【図１１】磁石式固定子の組付け方法を示す説明図である（従来技術）。
【図１２】磁石式固定子の組付け方法を示す説明図である（従来技術）。
【図１３】磁石式固定子の組付け方法を示す説明図である（従来技術）。
【符号の説明】
１固定子（磁石式固定子）
２ヨーク
３磁石
４固定部材
４ｂ固定部材の側片部
５治具
５ａ治具頭部
５ｂアーム部
８磁石より軟らかい部材[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for assembling a magnetic stator in a rotating electrical machine.
[0002]
[Prior art]
As a conventional technique, in a rotating electric machine having a magnet-type stator, as shown in FIG. 2, a fixing member 4 formed by bending a metal plate into a substantially U-shape between magnets 3 adjacent in the circumferential direction. And a method of fixing the magnet 3 to the yoke 2 using the elasticity of the fixing member 4 is known (see, for example, Patent Document 1).
A method for assembling the magnet 3 using the fixing member 4 will be described with reference to FIGS.
a) First, as shown in FIG. 10A, a predetermined number of fixing members 4 are set on the dummy jig 100, and a predetermined number of magnets 3 are set between the fixing members 4 adjacent in the circumferential direction. At this time, the fixing member 4 is set on the dummy jig 100 in a state in which the pair of side piece portions 4b is compressed inward.
[0003]
b) Subsequently, as shown in FIG. 11, a dummy jig 100 is inserted inside the yoke 2 and set at a predetermined position.
c) Subsequently, as shown in FIG. 12, the pushing portion 110 provided on the dummy jig 100 is pushed outward in the radial direction, and the fixing member 4 is assembled at a predetermined position of the yoke 2. Thereby, the side piece 4b of the fixing member 4 is elastically pressed against the side surface of the magnet 3, so that the magnet 3 is fixed in a state of being pressed against the inner peripheral surface of the yoke 2. d) Finally, as shown in FIG. 13, the dummy jig 100 is taken out of the yoke 2 and the assembly of the magnet 3 is completed.
[0004]
[Patent Document 1]
Japanese Patent Application 2002-10591
[0005]
[Problems to be solved by the invention]
However, in the above assembling method using the dummy jig 100, the fixing member 4 temporarily assembled to the dummy jig 100 is pushed outward in the radial direction and assembled to the yoke 2, so that the dummy jig 100 is temporarily assembled to the dummy jig 100. Further, the fixing member 4 needs to compress the side piece 4b of the fixing member 4 more than necessary from the state where it is actually assembled to the yoke 2. As a result, as shown in FIG. 10 (b), the back plate portion 4a of the fixing member 4 may be deformed, and when pushed out from the dummy jig 100 in this state, the elasticity of the fixing member 4 is greatly reduced. Therefore, the magnet 3 cannot be firmly fixed.
[0006]
Further, since the side piece 4b of the fixing member 4 is compressed more than necessary in the state of being set on the dummy jig 100, the elasticity applied to the side piece 4b is increased more than necessary, and the fixing member 4 is fixed to the dummy jig. When pushed out from 100, the side piece 4b hits the magnet 3 strongly, and the magnet 3 is strongly pressed against the inner peripheral surface of the yoke 2. For this reason, there is a possibility that damage such as cracking or chipping may occur in the magnet 3 due to an impact when the side piece 4b hits the magnet 3 or an impact when the magnet 3 is pressed against the inner peripheral surface of the yoke 2. It was.
The present invention has been made based on the above circumstances, and an object of the present invention is to provide a method of assembling a magnetic stator for a rotating electrical machine that can prevent deformation of a fixing member and damage to a magnet.
[0007]
[Means for Solving the Problems]
(Invention of Claim 1)
The present invention is arranged between a cylindrical yoke made of a magnetic material, a plurality of magnets arranged at equal intervals in the inner circumferential direction of the yoke, and magnets adjacent to each other in the circumferential direction. A plurality of side pieces that abut against the side surfaces of the magnets arranged on the magnet, and elastically press the magnets in the circumferential direction and in the radial direction so that the side pieces are elastic. A fixing method of a magnet type stator of a rotating electrical machine comprising a first fixing member and a first step of setting the fixing member at a predetermined position on the inner peripheral surface of the yoke, and a fixing between adjacent fixing members in the circumferential direction. By inserting a tool and pressing the side piece portion of the fixing member in the circumferential direction with the jig to elastically deform (shrink), a dimension that can insert a magnet between the fixing members adjacent in the circumferential direction is secured. Insert the magnet between two steps and the circumferentially adjacent fixing member Rutotomoni, and having a third step of retracting the jig tunes to insertion operation of the magnet from the yoke. Thus, after setting a some fixing member to the predetermined position of the yoke internal peripheral surface, a magnet is inserted between the fixing members adjacent to the circumferential direction, and it is assembled to a predetermined position.
[0008]
According to this method, since the magnet is assembled after setting the fixing member on the inner peripheral surface of the yoke, when the magnet is inserted between the fixing members adjacent in the circumferential direction, the fixing members adjacent in the circumferential direction are arranged. There is no need to make the dimensions larger than necessary. That is, between the fixing member adjacent in the circumferential direction (between the adjacent side piece portion), since the minimum dimension that can be inserted a magnet (circumferential width of the magnets substantially equal) need be secured by a jig When pressing the side piece of the fixing member in the circumferential direction, it is not necessary to compress the side piece more than necessary. That is, in the second step, the amount of deformation that is elastically deformed by pressing the side piece in the circumferential direction may be the same as the amount of deformation after the magnets are assembled, and thus the necessary minimum amount of deformation may be sufficient.
As a result, not only can the deformation of the fixing member be prevented, but also when the magnet is inserted, the side piece of the fixing member does not impact the magnet, and the magnet presses against the inner peripheral surface of the yoke with an excessive force. Therefore, damage such as breakage or chipping of the magnet can be prevented.
[0011]
(Invention of Claim 2 )
In the assembly method of the magnet type stator of the rotary electric machine according to claim 1 ,
In the second step, only the vicinity of the entrance between the fixing members into which the magnet is inserted is pressed in the circumferential direction by the jig in the circumferential direction to ensure a dimension capable of inserting the magnet.
When pressing the side piece at a position away from the vicinity of the entrance between the fixing members for inserting the magnets, even if the side piece is pressed with the same force as when pressing the side piece near the entrance, In the vicinity of the entrance, it is not possible to secure a dimension capable of inserting a magnet. For this reason, when trying to secure a dimension capable of inserting a magnet at the entrance between the fixed members, a larger pressing force is required than when the side piece is pressed near the entrance, and the amount of elastic deformation of the side piece increases. There is a possibility that the fixing member is deformed.
[0012]
On the other hand, in the present invention, the side piece is pressed in the circumferential direction only in the vicinity of the entrance between the fixing members for inserting the magnets, so that a dimension capable of inserting the magnet only in the vicinity of the entrance between the fixing members can be secured. As a result, the necessary minimum pressing force is sufficient, and the amount of elastic deformation of the side piece portion can be minimized, so that deformation of the fixing member can be prevented.
[0013]
(Invention of Claim 3 )
In the assembly method of the magnetic stator of the rotating electrical machine according to claim 1 or 2 ,
The jig includes a jig head having a contact surface that comes into contact with the side piece of the fixing member when the side piece of the fixing member is pressed in the second step, and an arm part that supports the jig head. The jig head is provided separately from the arm portion, and is detachably attached to the arm portion.
[0014]
In the jig used in the present invention, when the contact surface that comes into contact with the side piece portion of the fixing member is worn by repeated use, the amount of pressing and compressing the side piece portion (elastic deformation amount) becomes insufficient. Since it becomes difficult to insert the magnet, periodic replacement is required.
On the other hand, by making the jig head having the contact surface and the arm part supporting the jig head into a split structure and making the jig head detachable from the arm part, the contact surface When wears out, only the jig head can be removed from the arm and replaced. In this case, compared to the jig head having an integral structure with the arm portion, the cost of parts required for replacement is low, and the replacement work can be easily completed in a short time, thus improving productivity. Can be achieved.
[0015]
(Invention of Claim 4 )
In the assembly method of the magnet type stator of the rotary electric machine according to claim 1 ,
In the third step, when the magnet is inserted between the fixing members adjacent in the circumferential direction, the insertion operation is performed while pressing the tip end surface of the magnet in the insertion direction to the jig in the magnet insertion direction. Is extruded.
In this structure, since the jig can be pushed out in synchronization with the magnet insertion operation, a dedicated mechanism for pushing out the jig is unnecessary, and a simple and inexpensive jig can be provided.
[0016]
(Invention of Claim 5 )
In the assembly method of the magnet type stator of the rotary electric machine according to claim 1 ,
When the magnet is inserted between the fixing members adjacent in the circumferential direction, the corners of the magnet that first contact the yoke and the fixing member are chamfered or rounded.
According to this configuration, when the magnet is inserted, the contact resistance between the magnet, the yoke, and the fixing member is reduced, so that the magnet can be easily inserted. Even if the insertion position of the magnet is slightly deviated in the radial direction and circumferential direction of the yoke, the position of the magnet is corrected by chamfering or R-shape provided at the corners of the magnet, so that the magnet is attached to the yoke and the fixing member. It is possible to prevent getting on or getting caught. As a result, a smooth magnet can be inserted, and the cracking and chipping of the magnet can be prevented.
[0017]
(Invention of Claim 6 )
In the assembly method of the magnet type stator of the rotating electrical machine according to claim 4 ,
The jig has a magnet receiving surface against which the front end surface of the magnet in the insertion direction is pressed, and a member softer than the magnet is attached to the magnet receiving surface.
According to this configuration, when the insertion operation is performed while pressing the front end surface of the magnet (front end surface in the insertion direction) against the jig, the member is softer than the magnet between the front end surface of the magnet and the magnet receiving surface of the jig. Therefore, the tip of the magnet and the magnet receiving surface of the jig do not directly hit each other, and the impact when the tip of the magnet is pressed against the magnet receiving surface of the jig can be suppressed. it can. As a result, damage such as breakage or chipping of the magnet due to impact can be prevented.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a method of assembling a magnetic stator.
The rotating electrical machine according to the present embodiment is a starting motor used for a starter for starting an internal combustion engine, for example, and includes a magnetic stator (hereinafter referred to as a stator 1) that forms a field.
As shown in FIG. 2, the stator 1 is adjacent to a cylindrical yoke 2 made of a magnetic material and six magnets 3 arranged at equal intervals in the inner circumferential direction of the yoke 2 in the circumferential direction. It is comprised by the six fixing members 4 which are arrange | positioned between the magnets 3 and fix each magnet 3 to the yoke 2. As shown in FIG.
[0019]
As shown in FIG. 2, the magnet 3 is magnetized so that the south pole and the north pole appear in the radial direction of the yoke 2, and is magnetized so that the magnetic poles of the adjacent magnets 3 in the circumferential direction are different. .
As shown in FIG. 3, the fixing member 4 has a back plate portion 4a formed by bending an elastic metal plate (for example, a stainless steel plate) into a substantially U-shape and a pair of side piece portions 4b. The magnet 3 is pressed against the inner peripheral surface of the yoke 2 and fixed by giving elasticity to the side piece 4b and pressing the adjacent magnet 3 outward in the circumferential direction and the radial direction.
[0020]
Next, a method for assembling the stator 1 will be described.
(First embodiment)
First step: Six fixing members 4 are held in a state where they are pressed against predetermined positions on the inner peripheral surface of the yoke 2. At this time, positioning projections (not shown) are provided on the inner peripheral surface of the yoke 2, while a fitting hole (not shown) is formed in the back plate portion 4 a of the fixing member 4. The fixing member 4 is positioned with respect to the circumferential direction and the axial direction of the yoke 2 by fitting the fitting hole into the protrusion of the yoke 2.
[0021]
Second Step: A jig 5 is inserted between the fixing members 4 adjacent in the circumferential direction, and the side piece 4b is pressed by sliding the jig 5 in the circumferential direction and pressing the side piece 4b of the fixing member 4. Is elastically deformed in the circumferential direction to secure a dimension capable of inserting the magnet 3 between the adjacent fixing members 4.
Third Step: As shown in FIG. 1, the magnet 3 is inserted between the fixing members 4 adjacent in the circumferential direction from the upper side of the yoke 2, and the jig 5 is moved to the yoke 2 in synchronization with the insertion operation of the magnet 3. Retreat from inside. At this time, the jig 5 is pushed downward in synchronization with the insertion operation of the magnet 3 while ensuring a dimension capable of inserting the magnet 3 between the fixing members 4 adjacent in the circumferential direction.
[0022]
(Effects of the first embodiment)
According to the present embodiment, since the magnet 3 is assembled with the fixing member 4 set on the inner peripheral surface of the yoke 2, when the magnet 3 is inserted between the fixing members 4 adjacent in the circumferential direction, the adjacent fixing is performed. What is necessary is just to ensure the dimension which can insert the magnet 3 between the members 4. FIG. Accordingly, when the side piece 4b of the fixing member 4 is pressed and elastically deformed by the jig 5, the amount of deformation may be the same as the amount of deformation after the magnet 3 is assembled to the yoke 2. The amount of deformation of the portion 4b can be minimized. As a result, not only the deformation of the fixing member 4 can be prevented, but also when the magnet 3 is inserted, the side piece 4 b of the fixing member 4 does not give an impact to the magnet 3, and the magnet 3 has an inner circumference of the yoke 2. Since it is not pressed against the surface with an excessive force, it is possible to prevent damage such as cracking or chipping of the magnet 3.
[0023]
(Second embodiment)
FIG. 4 is an explanatory diagram of the second step described in the first embodiment.
As shown in FIG. 4, the jig 5 used in the second step is provided with a jig head 5 a that presses the side piece 4 b of the fixing member 4 protruding in a stepped shape. 5a is configured to press only the upper end of the side piece 4b in the figure (near the entrance when the magnet 3 is inserted between the fixing members 4 adjacent in the circumferential direction).
[0024]
In this case, in order to secure the dimension that allows the magnet 3 to be inserted between the fixing members 4 adjacent in the circumferential direction, the pressing force for elastically deforming the side piece 4b of the fixing member 4 can be suppressed to the minimum necessary. . In other words, the side piece 4b of the fixing member 4 only needs to be pressed and elastically deformed only in the vicinity of the entrance between the fixing members 4 into which the magnet 3 is inserted. Can be suppressed to the same extent as the deformation amount after assembling, and the deformation of the fixing member 4 can be prevented.
[0025]
On the other hand, for example, as shown in FIG. 5, when the side piece 4b is pressed at a position away from the vicinity of the entrance between the fixing members 4 for inserting the magnet 3, the side piece 4b is pressed near the entrance. Even if the side piece 4b is pressed with the same level of force as in the case, it is not possible to secure a dimension capable of inserting the magnet 3 in the vicinity of the entrance. For this reason, if it is going to ensure the dimension which can insert the magnet 3 in the entrance between the fixing members 4, larger pressing force will be needed rather than the case where the side piece part 4b is pressed near the entrance, and the amount of elastic deformation of the side piece part 4b is large. Since it becomes large, there exists a possibility that the fixing member 4 may deform | transform.
[0026]
(Third embodiment)
FIG. 6 is a perspective view of the jig 5 used in the second step described in the first embodiment.
As shown in FIG. 6, the jig 5 of this embodiment has a contact surface that comes into contact with the side piece 4 b when the side piece 4 b of the fixing member 4 is pressed in the second step. 5a and an arm portion 5b for supporting the jig head portion 5a. The jig head portion 5a is provided separately from the arm portion 5b, and is detachably attached to the arm portion 5b with screws 6 or the like. It has been.
[0027]
In the jig 5 used in the second step, when the abutting surface that abuts the side piece 4b of the fixing member 4 is worn due to repeated use, the side piece 4b is pressed and shrunk (elasticity). The amount of deformation) becomes insufficient and it becomes difficult to insert the magnet 3, so that periodic replacement is required.
On the other hand, when the jig head 5a and the arm part 5b are divided and the jig head 5a is detachable from the arm part 5b, the jig head 5a can be removed when the contact surface is worn. Can be removed from the arm portion 5b and replaced. In this case, as compared with a jig in which the jig head 5a is integrated with the arm part 5b, the cost of parts required for replacement is low, and the replacement work can be completed easily and in a short time. It is possible to improve the performance.
[0028]
(Fourth embodiment)
FIG. 7 is an explanatory diagram of the third step described in the first embodiment.
As shown in FIG. 7, the jig 5 for pressing the side piece 4 b of the fixing member 4 is pushed upward by the spring 7, and when the magnet 3 is inserted, the lower end surface of the magnet 3 is the jig. It contacts the upper end surface of the head 5a. Thereafter, by pushing the magnet 3 with a load larger than the reaction force of the spring 7, the jig 5 is pushed out in synchronism with the insertion operation of the magnet 3 as shown by the arrow in the figure, and the magnet 3 is inserted to a predetermined position. At this point, the jig 5 is detached from the fixing member 4.
According to this configuration, since the jig 5 can be pushed out in synchronization with the insertion operation of the magnet 3, a dedicated mechanism for pushing out the jig 5 is not required, and a simple and inexpensive jig 5 is provided. It is possible.
[0029]
(5th Example)
FIG. 8 is a plan view (a) showing an end face of the magnet 3 and a plan view (b) viewed from the inner diameter side.
In this embodiment, as shown in FIG. 8, the corners of the magnet 3 are provided with chamfers or R shapes. According to this configuration, when the magnet 3 is inserted in the third step, the contact resistance between the magnet 3 and the yoke 2 and the fixing member 4 is reduced, so that the insertion operation of the magnet 3 can be easily performed.
[0030]
Even if the insertion position of the magnet 3 is slightly shifted in the radial direction and the circumferential direction of the yoke 2, the position of the magnet 3 is corrected by the chamfering or the R shape provided at the corner of the magnet 3, so that the magnet 3 It is possible to prevent the yoke 2 and the fixing member 4 from getting on or being caught. As a result, the smooth magnet 3 can be inserted, and the magnet 3 can be prevented from being cracked or chipped. It should be noted that all corners of the magnet 3 may be chamfered or rounded, but only the corner that first contacts the yoke 2 and the fixing member 4 when the magnet 3 is inserted may be chamfered or rounded. .
[0031]
(Sixth embodiment)
FIG. 9 is a perspective view of the jig 5.
In this embodiment, when the magnet 3 is inserted in the third step, a member 8 (for example, a resin plate) softer than the magnet 3 is attached to the magnet receiving surface of the jig 5 with which the lower end surface of the magnet 3 abuts. It is characterized by that.
According to this configuration, when an insertion operation is performed while pressing the lower end surface (tip surface in the insertion direction) of the magnet 3 against the jig 5, the magnet 3 is interposed between the lower end surface of the magnet 3 and the magnet receiving surface of the jig 5. Since the member 8 softer than the magnet 3 is interposed, the lower end surface of the magnet 3 and the magnet receiving surface of the jig 5 do not directly and strongly contact each other, and the lower end surface of the magnet 3 is brought into contact with the magnet receiving surface of the jig 5. The impact when pressed can be suppressed. As a result, damage such as breakage or chipping of the magnet 3 due to impact can be prevented.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a method of assembling a magnetic stator.
FIG. 2 is an axial front view of a magnetic stator.
FIG. 3 is a perspective view of a fixing member.
FIG. 4 is an explanatory diagram of a second step.
FIG. 5 is a drawing showing a comparative example of the second step.
FIG. 6 is a perspective view of a jig.
FIG. 7 is an explanatory diagram of a third step.
FIG. 8A is a plan view showing an end face of a magnet, and FIG. 8B is a plan view seen from the inner diameter side.
FIG. 9 is a perspective view of a jig.
FIG. 10 is an explanatory view showing a method of assembling a magnet type stator (prior art).
FIG. 11 is an explanatory view showing a method of assembling a magnet type stator (prior art).
FIG. 12 is an explanatory view showing a method of assembling a magnet type stator (prior art).
FIG. 13 is an explanatory view showing a method of assembling a magnet type stator (prior art).
[Explanation of symbols]
1 Stator (Magnet type stator)
2 Yoke 3 Magnet 4 Fixing member 4b Side piece part 5 of fixing member Jig 5a Jig head part 5b Arm part 8 Member softer than magnet

Claims

A cylindrical yoke made of magnetic material;
A plurality of magnets arranged at equal intervals in the inner circumferential direction of the yoke;
It is arranged between the magnets adjacent to each other in the circumferential direction, and has a pair of side piece parts that contact the side surfaces of the magnets arranged on both sides of the magnet. A method of assembling a magnetic stator of a rotating electrical machine comprising a plurality of fixing members for fixing the magnet to the yoke by pressing the magnet outward in a circumferential direction and a radial direction,
A first step of setting the fixing member at a predetermined position on the inner circumferential surface of the yoke;
A jig is inserted between the fixing members adjacent in the circumferential direction, and the side pieces of the fixing member are pressed and elastically deformed by the jig in the circumferential direction. A second step of ensuring a dimension capable of inserting the magnet;
And a third step of inserting the magnet between the fixing members adjacent in the circumferential direction and retreating the jig from the yoke in synchronism with the magnet insertion operation . Assembling method of magnetic stator.

In the assembly method of the magnet type stator of the rotary electric machine according to claim 1,
In the second step, the side piece portion is pressed in the circumferential direction by the jig only in the vicinity of the entrance between the fixing members into which the magnet is inserted, and a dimension capable of inserting the magnet is ensured. A method of assembling a magnetic stator of a rotating electrical machine.

In the assembly method of the magnetic stator of the rotating electrical machine according to claim 1 or 2,
The jig has a jig head having a contact surface that comes into contact with the side piece of the fixing member when the side piece of the fixing member is pressed in the second step, and supports the jig head. Assembly of the magnetic stator of the rotating electrical machine , wherein the jig head is provided separately from the arm portion and is detachably attached to the arm portion Method.

In the assembly method of the magnet type stator of the rotary electric machine according to claim 1 ,
In the third step, when the magnet is inserted between the fixing members adjacent to each other in the circumferential direction, an insertion operation is performed while pressing a front end surface of the magnet in the insertion direction against the jig. A method of assembling a magnetic stator of a rotating electrical machine , wherein the jig is pushed out in an insertion direction .

In the assembly method of the magnet type stator of the rotary electric machine according to claim 1 ,
A chamfering or R shape is provided at a corner of the magnet that first contacts the yoke and the fixing member when the magnet is inserted between the fixing members adjacent in the circumferential direction. Assembling method of magnetic stator.

In the assembly method of the magnet type stator of the rotating electrical machine according to claim 4 ,
The jig has a magnet receiving surface against which a front end surface of the magnet in the insertion direction is pressed, and a member that is softer than the magnet is attached to the magnet receiving surface. Assembly method.