JP2015159674A - Stator of rotary electric machine - Google Patents

Stator of rotary electric machine Download PDF

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JP2015159674A
JP2015159674A JP2014033593A JP2014033593A JP2015159674A JP 2015159674 A JP2015159674 A JP 2015159674A JP 2014033593 A JP2014033593 A JP 2014033593A JP 2014033593 A JP2014033593 A JP 2014033593A JP 2015159674 A JP2015159674 A JP 2015159674A
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ring core
stator
inner ring
end plate
outer ring
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JP6157379B2 (en
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尚史 苗村
Hisafumi Naemura
尚史 苗村
川村　浩司
Koji Kawamura
浩司 川村
伊藤　慎一
Shinichi Ito
慎一 伊藤
豊秋 有働
Toyoaki Arido
豊秋 有働
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To make it possible to reduce a variation of electromagnetic characteristics and reduce a variation of assembly caused by a contact part of an inner ring core and an outer ring core by correctly combining the inner ring core and the outer ring core.SOLUTION: When forming a stator by press fitting an inner ring core from an axial direction to an outer ring core, a notch for recognizing a circumferential directional position of the outer ring core is provided, an end plate is mounted at one end part in an axial direction of the inner ring core, and, at the end plate, a projection for determining a circumferential directional position of the inner ring core by referencing the notch when press fitting the inner ring core to the outer ring core is provided.

Description

この発明は、回転電機のステータの構造に関するものである。   The present invention relates to the structure of a stator of a rotating electrical machine.

従来のステータにおいて、ティース部とヨーク部が別体の部品として構成され、ティース部にコイルが巻線された後にティース部とヨーク部が圧入嵌合にて組みつけられる構造のステータが知られている。例えば特許文献１には、磁束路となるヨークは、内周面の周方向に並ぶ複数の圧入溝を有し、それぞれの圧入溝にティースが圧入により組み付けられているステータが開示されている。   In a conventional stator, a stator having a structure in which a tooth portion and a yoke portion are configured as separate parts, and the tooth portion and the yoke portion are assembled by press-fitting after the coil is wound around the tooth portion is known. Yes. For example, Patent Document 1 discloses a stator in which a yoke serving as a magnetic flux path has a plurality of press-fitting grooves arranged in the circumferential direction of the inner peripheral surface, and teeth are assembled into the press-fitting grooves by press-fitting.

また特許文献２において、ティース部は各ティースごとに分割されており、ティース部の軸方向両端部にティース部と同形状の端板が設けられ、端板を介してティース部は連結されており、ティース部の外周はモータケーシング内周に当接しているステータが開示されている。   Moreover, in patent document 2, the teeth part is divided | segmented for every tooth, the end plate of the same shape as a teeth part is provided in the axial direction both ends of the teeth part, and the teeth part is connected via the end plate. A stator is disclosed in which the outer periphery of the tooth portion is in contact with the inner periphery of the motor casing.

特開２０１２−１１５１２４号公報JP2012-115124A 特開２００９−２６８１６８号公報JP 2009-268168 A

上記のようなティース部とヨーク部が別体であるステータは、ティース部とヨーク部を製造するにあたり、ティース部とヨーク部が一体となった状態からティース部とヨーク部を分離するようにプレスで打ち抜いて製造することが一般的に行われている。この場合ティース部とヨーク部を組立てるに際して、以下に示す理由により、ティース部とヨーク部の周方向の位置が分離前と同じとなるように組立てることが重要である。   The stator having the teeth portion and the yoke portion as separate members is pressed to separate the teeth portion and the yoke portion from the state in which the teeth portion and the yoke portion are integrated in manufacturing the teeth portion and the yoke portion. It is generally carried out by punching out with. In this case, when assembling the teeth portion and the yoke portion, it is important to assemble so that the circumferential positions of the teeth portion and the yoke portion are the same as before separation for the following reasons.

すなわち一般的にステータに用いられる電磁鋼板は長手方向と幅方向において電磁特性の異方性を有していることが多く、そのためティース部とヨーク部も異方性を有する。ティース部とヨーク部の周方向の位置の組合せが合わないと、ステータの電磁特性がばらつくことになり、回転電機の性能に問題が生じてしまう。   That is, in general, the electromagnetic steel sheet used for the stator often has anisotropy of electromagnetic characteristics in the longitudinal direction and the width direction, and therefore the teeth portion and the yoke portion also have anisotropy. If the combination of the positions in the circumferential direction of the teeth portion and the yoke portion is not matched, the electromagnetic characteristics of the stator will vary, causing problems in the performance of the rotating electrical machine.

更に複数のティース部を同形状にするとともに、ヨーク部外周に対して同軸に構成するための金型を作製することが考えられるが、当然金型ごとにばらつきが生じる。このためティース部とヨーク部の周方向の位置が合わない場合に、ティース部とヨーク部の当接部間に微小な隙間が生じたり、ティース部に周方向における傾きが生じたり、更にはヨーク部外周とティース部内周の間の同軸性が損なわれることがあり、組立精度の低下が生じることがある。その結果、回転電機の性能に問題が生じることがある。   Further, it is conceivable to make a plurality of teeth portions in the same shape and to manufacture a mold for forming the same coaxially with the outer periphery of the yoke portion. For this reason, when the circumferential positions of the teeth portion and the yoke portion do not match, a minute gap is generated between the contact portions of the teeth portion and the yoke portion, the teeth portion is inclined in the circumferential direction, and further the yoke The coaxiality between the outer periphery of the part and the inner periphery of the tooth part may be impaired, and assembly accuracy may be reduced. As a result, a problem may occur in the performance of the rotating electrical machine.

またティース部とヨーク部が別体であるステータの場合、上記特許文献１のようにティース部はティースごとに別体に構成したり、あるいは特許文献２のように端板を介して連結される構造が考えられる。この場合ティース部はステータ内周で連結される構造となるが、上記特許文献１及び特許文献２のどちらの場合も構造体としての剛性は低いものとなり、ヨーク部との組立においてティースの位置決めに課題を有している。   Further, in the case of a stator in which the teeth part and the yoke part are separate bodies, the tooth parts are configured separately for each tooth as in Patent Document 1, or are connected via an end plate as in Patent Document 2. A structure is conceivable. In this case, the teeth portion is connected to the inner periphery of the stator. However, in both cases of Patent Document 1 and Patent Document 2, the rigidity of the structure is low, and the teeth are positioned in the assembly with the yoke portion. Has a problem.

例えば特許文献１においては、ヨーク部内周は圧入溝を有し、ティース部が圧入溝に嵌合することで組立てられることにより、ヨーク部に対してティース部の位置決めがなされる。しかしながら、どの圧入溝にどのティースを圧入組立するかは規定できないため、ステータの電磁特性がばらついてしまう等の問題が生じ、モータの性能に問題が生じることがある。また特許文献２においては、端板によって各ティースの位置決めがなされる。しかしながら、ヨーク部に対して各ティースを周方向に位置決めする手段がないため、ステータの電磁特性がばらついてしまう等の問題が生じ、モータの性能に問題が生じることがある。   For example, in Patent Document 1, the inner periphery of the yoke portion has a press-fit groove, and the tooth portion is positioned with respect to the yoke portion by being assembled by fitting the tooth portion into the press-fit groove. However, since it is not possible to define which teeth are press-fitted and assembled in which press-fitting groove, problems such as variations in the electromagnetic characteristics of the stator may occur, which may cause problems in motor performance. In Patent Document 2, each tooth is positioned by an end plate. However, since there is no means for positioning the teeth in the circumferential direction with respect to the yoke portion, problems such as variations in the electromagnetic characteristics of the stator may occur, which may cause problems in motor performance.

この発明は、上記のような問題点を解決するためになされたものであり、ティース部とヨーク部を嵌合組立する際にティース部とヨーク部を正しく組み合わせ、電磁特性のばらつきや、ティース部とヨーク部の当接部に起因する組立ばらつきを低減することを目的としている。   The present invention has been made to solve the above-described problems. When the teeth portion and the yoke portion are assembled and assembled, the teeth portion and the yoke portion are correctly combined, so that variations in electromagnetic characteristics and the teeth portion can be achieved. It is an object to reduce assembly variation caused by the contact portion of the yoke portion.

この発明に係る回転電機のステータは、１つの電磁鋼板から打ち抜かれることによって形成された内輪コアと外輪コアとを有し、内輪コアを軸方向から外輪コアに圧入することにより形成されるものであって、外輪コアには周方向の位置を認識するための指標を設け、内輪コアの軸方向一端部には端板を取り付けると共に端板には内輪コアを外輪コアに圧入する際に指標を基準に内輪コアの周方向の位置を決めるための目印を設けたものである。   The stator of the rotating electrical machine according to the present invention has an inner ring core and an outer ring core formed by being punched from one electromagnetic steel sheet, and is formed by press-fitting the inner ring core into the outer ring core from the axial direction. The outer ring core is provided with an index for recognizing the circumferential position, and an end plate is attached to one end of the inner ring core in the axial direction, and the end plate is indexed when the inner ring core is press-fitted into the outer ring core. A mark for determining the circumferential position of the inner ring core is provided as a reference.

上記のように構成された回転電機のステータにおいては、内輪コアと外輪コアを正しく組み合わせることができ、電磁特性のばらつきを低減できるとともに、内輪コアと外輪コアの当接部に起因する組立のばらつきを低減することができる。   In the stator of the rotating electrical machine configured as described above, the inner ring core and the outer ring core can be correctly combined, the variation in electromagnetic characteristics can be reduced, and the variation in assembly caused by the contact portion between the inner ring core and the outer ring core. Can be reduced.

実施の形態１による回転電機を示す断面図である。1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1. FIG. ステータ部を示す平面図である。It is a top view which shows a stator part. ステータに巻回されるコイルを示す斜視図である。It is a perspective view which shows the coil wound around a stator. ステータコアを形成する内輪コアを示す斜視図である。It is a perspective view which shows the inner ring | wheel core which forms a stator core. ステータコアを形成する外輪コアを示す斜視図である。It is a perspective view which shows the outer ring | wheel core which forms a stator core. 端板を示す斜視図である。It is a perspective view which shows an end plate. 内輪コアに端板を取り付けた状態を示す斜視図である。It is a perspective view which shows the state which attached the end plate to the inner ring core. 端板を示す斜視図である。It is a perspective view which shows an end plate. 端板を示す斜視図である。It is a perspective view which shows an end plate. 内輪コアの１つのティースについて、端板を取り付けた状態を示す斜視図である。It is a perspective view which shows the state which attached the end plate about one teeth of the inner ring core. 図１０における正面図である。It is a front view in FIG. 内輪コアに外輪コアを圧入した後のステータコアを示す平面図である。It is a top view which shows the stator core after press-fitting an outer ring core in an inner ring core. １つの電磁鋼板から内輪コアと外輪コアを形成する過程を示す平面図である。It is a top view which shows the process in which an inner ring core and an outer ring core are formed from one electromagnetic steel plate. ティースと外輪コアとの当接部を示す拡大平面図である。It is an enlarged plan view which shows the contact part of a tooth | gear and an outer ring core. 端板を示す斜視図である。It is a perspective view which shows an end plate. 端板を示す斜視図である。It is a perspective view which shows an end plate. 実施の形態２によるステータにおける端板を示す斜視図である。FIG. 6 is a perspective view showing an end plate in a stator according to a second embodiment.

実施の形態１．
以下この発明の実施形態を図に基づいて説明する。図１は実施の形態１による回転電機を示す断面図である。図１においては、回転電機１の一例として３相交流モータが示されており、回転電機１は回転磁界を発生させるステータ２、ステータ２の内周側に配置されて回転磁界により回転するロータ３、ロータ３の回転に伴って回転する出力軸４、出力軸４を軸支するベアリング５及びベアリング６、ステータ２とベアリング５を保持するハウジング７、ベアリング６を保持するブラケット８、出力軸４の回転角度を検出するセンサ９、パワーＭＯＳＦＥＴなどからなるパワー素子（半導体スイッチング素子）１０、制御基板１１から構成される。 Embodiment 1 FIG.
Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1. FIG. In FIG. 1, a three-phase AC motor is shown as an example of a rotating electrical machine 1. The rotating electrical machine 1 is a stator 2 that generates a rotating magnetic field, and a rotor 3 that is disposed on the inner peripheral side of the stator 2 and rotates by the rotating magnetic field. The output shaft 4 that rotates as the rotor 3 rotates, the bearing 5 and the bearing 6 that support the output shaft 4, the housing 7 that holds the stator 2 and the bearing 5, the bracket 8 that holds the bearing 6, and the output shaft 4 A sensor 9 that detects a rotation angle, a power element (semiconductor switching element) 10 including a power MOSFET, and a control board 11 are included.

本実施の形態においては、センサ９、パワー素子１０及び制御基板１１といったモータを駆動制御する装置が一体となった構成例を示したが、駆動制御装置が別体となって構成される回転電機であってもよい。図２はステータ部を示す平面図、図３はステータに巻回されるコイルを示す斜視図である。尚図２においては、コイルを省略して図示されている。   In the present embodiment, the configuration example is shown in which the motor 9, such as the sensor 9, the power element 10, and the control board 11, are integrated. However, the rotating electrical machine is configured with the drive control device as a separate body. It may be. FIG. 2 is a plan view showing a stator portion, and FIG. 3 is a perspective view showing a coil wound around the stator. In FIG. 2, the coil is not shown.

ステータ２はステータコア２１とステータコア２１に巻線されたコイル２２とを有し、コイル２２に３相交流電流を流すことにより回転磁界を形成し、回転磁界内に配置されるロータ３を回転させる。コイル２２は３相のコイル（Ｕ相コイル、Ｖ相コイル、Ｗ相コイル）を有している。ロータ３はたとえば表面磁石型（ＳＰＭ）で構成されている。他にもロータ３は埋込磁石型（ＩＰＭ）、電磁石型、鉄心型など様々な態様を取りえる。   The stator 2 has a stator core 21 and a coil 22 wound around the stator core 21, a rotating magnetic field is formed by flowing a three-phase alternating current through the coil 22, and the rotor 3 disposed in the rotating magnetic field is rotated. The coil 22 has three-phase coils (U-phase coil, V-phase coil, and W-phase coil). The rotor 3 is constituted by, for example, a surface magnet type (SPM). In addition, the rotor 3 can take various forms such as an embedded magnet type (IPM), an electromagnet type, and an iron core type.

図４はステータコアを形成する内輪コアを示す斜視図、図５は外輪コアを示す斜視図である。ステータコア２１、内輪コア２５及び外輪コア２６は薄板の積層体から構成されているが、図においては判りやすくするため、薄板の一枚一枚は図示していない。ステータコア２１は周方向に略一定間隔で複数配置されるティース２３、及びティース２３の内周部を連結する連結部２４から構成される内輪コア２５と、ステータ２のコアバックを構成する筒状の外輪コア２６から構成される。   FIG. 4 is a perspective view showing an inner ring core forming a stator core, and FIG. 5 is a perspective view showing an outer ring core. The stator core 21, the inner ring core 25, and the outer ring core 26 are formed of a laminated body of thin plates, but each of the thin plates is not shown in the drawing for easy understanding. The stator core 21 includes a plurality of teeth 23 arranged at substantially constant intervals in the circumferential direction, an inner ring core 25 composed of a connecting portion 24 that connects inner peripheral portions of the teeth 23, and a cylindrical shape that constitutes a core back of the stator 2. The outer ring core 26 is configured.

内輪コア２５と外輪コア２６はそれぞれ電磁鋼板をプレスで打ち抜かれた後、電磁鋼板を積層してかしめなどの手段によってそれぞれ一体化されて構成される。内輪コア２５と外輪コア２６はプレスで打ち抜かれる過程において、初期は一体であるが、プレス工程内で金型によって分離され別々の部品となる。   The inner ring core 25 and the outer ring core 26 are each formed by punching out electromagnetic steel sheets with a press, and then laminating the electromagnetic steel sheets and integrating them by means such as caulking. The inner ring core 25 and the outer ring core 26 are initially integrated in the process of being punched out by a press, but are separated by a mold in the pressing process into separate parts.

外輪コア２６の外周には指標となる３か所の切欠き１０１、１０２、１０３が設けられる。３か所の切欠きは周方向に等間隔に設けられており、切欠き１０１の幅寸法が他の切欠き１０２、１０３の幅寸法とわずかに相違させることで、外輪コア２６の外周に設けられた切欠きを基準にして、外輪コア２６の周方向の位置を一義的に決めることができる。外輪コア２６の外周の切欠きの数は３個に限るものではなく、周方向に略等間隔に複数設けてもよい。あるいは積層かしめの形状やかしめの寸法を変えることによって周方向の位置決め基準としてもよい。   Three notches 101, 102, 103 serving as indices are provided on the outer periphery of the outer ring core 26. The three notches are provided at equal intervals in the circumferential direction, and are provided on the outer periphery of the outer ring core 26 by making the width dimension of the notches 101 slightly different from the width dimensions of the other notches 102 and 103. The position in the circumferential direction of the outer ring core 26 can be uniquely determined based on the cutouts made. The number of cutouts on the outer periphery of the outer ring core 26 is not limited to three, and a plurality of cutouts may be provided at substantially equal intervals in the circumferential direction. Or it is good also as the positioning reference of the circumferential direction by changing the shape of lamination | stacking crimping, or the dimension of crimping.

内輪コア２５の軸方向の両端部には図６に示すように突起部４１を有する形状の端板２７と突起部を有さない端板２８が取り付けられる。図７は内輪コア２５に端板２７及び端板２８を取り付けた状態を示す斜視図、図８は端板２７を示す斜視図、図９は端板２８を示す斜視図である。又図１０は内輪コア２５の１つのティース２３について、端板２７及び端板２８を取り付けた状態を示す斜視図、図１１は図１０における正面図である。端板２７及び端板２８は例えば板金で形成される。そして板金を曲げることにより突起部４１は軸方向において凸部を形成することが出来るようになる。   As shown in FIG. 6, an end plate 27 having a projection 41 and an end plate 28 having no projection are attached to both ends of the inner ring core 25 in the axial direction. 7 is a perspective view showing a state in which the end plate 27 and the end plate 28 are attached to the inner ring core 25, FIG. 8 is a perspective view showing the end plate 27, and FIG. 9 is a perspective view showing the end plate 28. 10 is a perspective view showing a state in which the end plate 27 and the end plate 28 are attached to one tooth 23 of the inner ring core 25, and FIG. 11 is a front view of FIG. The end plate 27 and the end plate 28 are made of sheet metal, for example. And the protrusion 41 can form a convex part in an axial direction by bending a sheet metal.

端板２７及び端板２８は例えばプレスによってエッジ部を丸める。エッジ部の丸めはプレスによるものだけでなく、例えば切削やバレルなどによってもよい。端板２７及び端板２８はエッジ部が丸められた面１２０、１２１が、内輪コア２５の軸方向外側になるように、内輪コア２５に例えばレーザー溶接によって取り付けられる。内輪コア２５と端板２７、端板２８の固定はレーザー溶接に限るものではなく、例えば抵抗溶接やかしめ、更には接着などの方法が考えられる。   The end plate 27 and the end plate 28 have their edges rounded, for example, by pressing. The rounding of the edge portion may be performed not only by pressing but also by cutting or barreling, for example. The end plate 27 and the end plate 28 are attached to the inner ring core 25 by, for example, laser welding so that the surfaces 120 and 121 having rounded edges are on the outer side in the axial direction of the inner ring core 25. The fixing of the inner ring core 25, the end plate 27, and the end plate 28 is not limited to laser welding, and for example, resistance welding, caulking, and further bonding methods are conceivable.

端板２８はモータ組立時にロータ３を挿通する側のステータ２端面に取り付け、端板２７はその反対側に取り付ける。図１の回転電機１は組立工程において、コイル２２の結線側の反対側からロータ３を挿通する構造であるため、端板２７をコイル２２の結線側に取り付け、端板２８がコイル２２の結線側とは反対側に取り付ける。そのため、端板２８の内径はロータ３の外径よりも大きく、端板２７の内径はベアリング５の外径より大きい寸法であれば、回転電機１を組み立てることができる。   The end plate 28 is attached to the end face of the stator 2 on the side through which the rotor 3 is inserted during motor assembly, and the end plate 27 is attached to the opposite side. 1 has a structure in which the rotor 3 is inserted from the side opposite to the connection side of the coil 22 in the assembly process, the end plate 27 is attached to the connection side of the coil 22, and the end plate 28 is connected to the coil 22. Attach to the opposite side. Therefore, the rotating electrical machine 1 can be assembled if the inner diameter of the end plate 28 is larger than the outer diameter of the rotor 3 and the inner diameter of the end plate 27 is larger than the outer diameter of the bearing 5.

端板２７の内周側には突起部４１が１つ構成されている。突起部４１の数は１つとは限らず、等間隔とならないように複数配置してもよい。さらに突起部４１は軸方向に略直角に曲げられている。内輪コア２５が電磁鋼板の長手方向に対してどの角度であったかを記録しておき、端板２７を内輪コア２５に組み付けるときに突起部４１を周方向の特定の角度になるように端板２７を内輪コア２５に組み付ける。   One protrusion 41 is formed on the inner peripheral side of the end plate 27. The number of protrusions 41 is not limited to one, and a plurality of protrusions 41 may be arranged so as not to be equally spaced. Further, the protrusion 41 is bent substantially at right angles to the axial direction. The angle of the inner ring core 25 with respect to the longitudinal direction of the magnetic steel sheet is recorded, and when the end plate 27 is assembled to the inner ring core 25, the end plate 27 is set so that the protrusion 41 has a specific angle in the circumferential direction. Is assembled to the inner ring core 25.

内輪コア２５には絶縁部材（図示せず）を介してコイル２２が巻線される。コイル２２は図３に示すような形状のコイルを溶接などにより複数接続したセグメントコイルである。コイル２２は内輪コア２５の外周側の開口部からティース２３の間に挿入され、いわゆる分布巻と呼ばれる巻き方で内輪コア２５に巻線される。分布巻で構成することにより、トルク性能が向上し、振動騒音を低減することが出来る。内輪コア２５にコイル２２が巻線された後、内輪コア２５を軸方向から外輪コア２６に圧入する。図１２は内輪コア２５に外輪コア２６を圧入した後のステータコアを示す平面図である。但しコイルの図示は省略されている。
本例ではコイル２２はセグメントコイルの分布巻の例を示したが、コイルが複数に分割されていないようなコイルであってもよいし、分布巻ではなく集中巻であってもよい。 A coil 22 is wound around the inner ring core 25 via an insulating member (not shown). The coil 22 is a segment coil in which a plurality of coils having a shape as shown in FIG. 3 are connected by welding or the like. The coil 22 is inserted between the teeth 23 through the opening on the outer peripheral side of the inner ring core 25 and wound around the inner ring core 25 by a so-called distributed winding method. By configuring with distributed winding, torque performance can be improved and vibration noise can be reduced. After the coil 22 is wound around the inner ring core 25, the inner ring core 25 is press-fitted into the outer ring core 26 from the axial direction. FIG. 12 is a plan view showing the stator core after the outer ring core 26 is press-fitted into the inner ring core 25. However, the illustration of the coil is omitted.
In this example, the coil 22 is an example of distributed winding of segment coils, but the coil may be a coil that is not divided into a plurality of coils, or concentrated winding instead of distributed winding.

圧入時には突起部４１を基準に内輪コア２５の周方向の位置決めを行い、外輪コア２６の外周の切欠きを基準に内輪コア２５に対する外輪コア２６の周方向の位置決めを行う。図１２においては、外輪コア２６の切欠き１０１と端板２７の突起部４１が同じ周方向位置となるように組み立てられている。上述のように、内輪コア２５と外輪コア２６は元々は一体であったものが、プレスで打ち抜かれる過程で分離されており、圧入工程において再び組み合わされる。そのため内輪コア２５を外輪コア２６に圧入するにあたり、内輪コア２５と外輪コア２６の電磁鋼板の長手方向に対する方向を正しく合わせることが重要である。   At the time of press-fitting, the inner ring core 25 is positioned in the circumferential direction with reference to the protrusion 41, and the outer ring core 26 is positioned in the circumferential direction with respect to the inner ring core 25 based on the notch on the outer periphery of the outer ring core 26. In FIG. 12, the outer ring core 26 is assembled so that the notch 101 and the protrusion 41 of the end plate 27 are at the same circumferential position. As described above, the inner ring core 25 and the outer ring core 26 which were originally integrated are separated in the process of being punched out by a press, and are combined again in the press-fitting process. Therefore, when the inner ring core 25 is press-fitted into the outer ring core 26, it is important to correctly match the directions of the inner ring core 25 and the outer ring core 26 with respect to the longitudinal direction of the electromagnetic steel sheet.

図１３は１つの電磁鋼板から内輪コア２５と外輪コア２６を形成する過程を示す平面図である。例えば外輪コア２６の外周の切欠き１０１と外輪コア２６の中心とを結ぶ線が電磁鋼板の長手方向Ａと一致している。この状態では内輪コア２５の方向を確認できる目印がないため、内輪コア２５の方向を決めた状態でプレス機から内輪コア２５を取り出し、端板２７を内輪コア２５に取り付け、目印となる突起部４１が指標となる切欠き１０１と一致するよう調整する。これにより図１２に示すように、後の行程で正しく外輪コア２６に対して内輪コア２５を取り付けることが出来る。   FIG. 13 is a plan view showing a process of forming the inner ring core 25 and the outer ring core 26 from one electromagnetic steel plate. For example, a line connecting the notch 101 on the outer periphery of the outer ring core 26 and the center of the outer ring core 26 coincides with the longitudinal direction A of the electromagnetic steel sheet. In this state, since there is no mark for confirming the direction of the inner ring core 25, the inner ring core 25 is taken out from the press with the direction of the inner ring core 25 determined, and the end plate 27 is attached to the inner ring core 25. 41 is adjusted to match the notch 101 serving as an index. As a result, as shown in FIG. 12, the inner ring core 25 can be correctly attached to the outer ring core 26 in the subsequent stroke.

電磁鋼板には長手方向と幅方向で異方性があるため、内輪コア２５と外輪コア２６はそれぞれ周方向の角度によって電磁的特性が異なる。内輪コア２５と外輪コア２６の圧入において、周方向に正しく位置を合わせることでステータ２の電磁的特性のばらつきを生じさせることなく、組み立てることができる。また内輪コア２５と外輪コア２６は元々一体であったものをプレスによって分離したものであり、当然ティースごとにわずかな形状のばらつきが生じる。形状ばらつきとしては、例えば内輪コア２５と外輪コア２６の当接部の形状が考えられる。又同一の電磁鋼板から形成する場合に元の位置においてティース２３と外輪コア２６の当接部１０４が一致しない場合、ティース２３が外輪コア２６に対して傾いてしまうことにより形状がばらついてしまうことがある（後の説明における図１４参照）。更にはティースの長さのばらつき等も考えられる。   Since the magnetic steel sheet has anisotropy in the longitudinal direction and the width direction, the inner ring core 25 and the outer ring core 26 have different electromagnetic characteristics depending on the angle in the circumferential direction. In the press-fitting of the inner ring core 25 and the outer ring core 26, assembly can be performed without causing variations in the electromagnetic characteristics of the stator 2 by properly aligning the positions in the circumferential direction. Further, the inner ring core 25 and the outer ring core 26 are originally integrated and separated by a press, and naturally, slight variations in shape occur for each tooth. As the shape variation, for example, the shape of the contact portion between the inner ring core 25 and the outer ring core 26 can be considered. If the contact portions 104 of the teeth 23 and the outer ring core 26 do not coincide with each other in the original position when they are formed from the same electromagnetic steel sheet, the shape of the teeth 23 varies due to the inclination of the teeth 23 with respect to the outer ring core 26. (See FIG. 14 in the later description). Furthermore, variation in the length of the teeth can be considered.

内輪コア２５と外輪コア２６の当接部の形状がばらついた場合、内輪コア２５と外輪コア２６の電磁鋼板の長手方向に対する方向（図１３におけるＡ方向）が正しく合わせられないことが生じ、内輪コア２５と外輪コア２６の当接部において微小な隙間が生じることがある。これによりティース２３ごとに外輪コア２６に流れる磁束の流れがばらつくため、ステータ２の電磁特性のばらつきの原因となる。またティース２３の外輪コア２６との当接部１０４（図１２参照）の形状がばらつくと、内輪コア２５と外輪コア２６の電磁鋼板の長手方向に対する方向が正しく合わせられない場合が生じ、ティース２３は内輪コア２５の中心線からずれた形で外輪コア２６と固定される。そのためティース２３ごとに磁束の流れがばらつくため、ステータ２の電磁特性のばらつきの原因となる。   When the shape of the contact portion between the inner ring core 25 and the outer ring core 26 varies, the direction of the inner ring core 25 and the outer ring core 26 relative to the longitudinal direction of the electromagnetic steel sheet (direction A in FIG. 13) may not be correctly aligned. A minute gap may occur at the contact portion between the core 25 and the outer ring core 26. As a result, the flow of magnetic flux flowing through the outer ring core 26 varies from one tooth 23 to another, which causes variations in electromagnetic characteristics of the stator 2. Further, if the shape of the contact portion 104 (see FIG. 12) of the teeth 23 with the outer ring core 26 varies, the directions of the inner ring core 25 and the outer ring core 26 with respect to the longitudinal direction of the electromagnetic steel sheet may not be correctly aligned. Is fixed to the outer ring core 26 so as to be offset from the center line of the inner ring core 25. For this reason, the flow of magnetic flux varies from one tooth 23 to another, which causes variations in electromagnetic characteristics of the stator 2.

図１４はティースと外輪コアとの当接部を示す拡大平面図であり、図１４（Ａ）は当接部の形状が理想的な場合、図１４（Ｂ）、（Ｃ）は当接部の形状がばらついた場合であり、図１４（Ｂ）は内輪コア２５と外輪コア２６の組み合わせが正しい場合、図１４（Ｃ）は内輪コア２５と外輪コア２６の組み合わせが正しくない場合である。図１４（Ｂ）の場合、当接部１０４がステータの半径方向に対して傾いているが、内輪コア２５と外輪コア２６が正しく組み合わされているため、内輪コア２５と外輪コア２６を組み立てるとその傾きの影響は小さい。一方、図１４（Ｃ）の場合、当接部１０４がステータの半径方向に対して傾いており、さらに内輪コア２５と外輪コア２６の組み合わせが正しくないため、内輪コア２５と外輪コア２６を組み立てると当接部１０４の形状にならってティース２３が曲がったり、あるいは当接部１０４に隙間が生じることとなり、ステータ２の電磁特性のばらつきの原因となる。またティース２３の長さがばらついた場合、内輪コア２５の内周と外輪コア２６の外周の同軸度が悪化し、ステータ２とロータ３の間のエアギャップがばらつき、回転電機１が発生させるトルクの低下、振動及び騒音が生じる場合がある。   FIG. 14 is an enlarged plan view showing the contact portion between the teeth and the outer ring core. FIG. 14A shows an ideal shape of the contact portion, and FIGS. 14B and 14C show the contact portion. 14B shows a case where the combination of the inner ring core 25 and the outer ring core 26 is correct, and FIG. 14C shows a case where the combination of the inner ring core 25 and the outer ring core 26 is incorrect. In the case of FIG. 14B, the contact portion 104 is inclined with respect to the radial direction of the stator. However, since the inner ring core 25 and the outer ring core 26 are correctly combined, the inner ring core 25 and the outer ring core 26 are assembled. The influence of the inclination is small. On the other hand, in the case of FIG. 14C, the contact portion 104 is inclined with respect to the radial direction of the stator, and the combination of the inner ring core 25 and the outer ring core 26 is not correct, so the inner ring core 25 and the outer ring core 26 are assembled. Then, the teeth 23 bend in accordance with the shape of the abutting portion 104, or a gap is generated in the abutting portion 104, which causes variations in electromagnetic characteristics of the stator 2. If the length of the teeth 23 varies, the coaxiality between the inner periphery of the inner ring core 25 and the outer periphery of the outer ring core 26 deteriorates, the air gap between the stator 2 and the rotor 3 varies, and the torque generated by the rotating electrical machine 1 Decrease, vibration and noise may occur.

本実施形態においては、以上のような形状のばらつきが生じても、内輪コア２５と外輪コア２６を電磁鋼板の長手方向に対する方向に対して正しく合わせて組立を行うことができるので、上記のばらつきの影響をキャンセルしてステータ２を組み立てることができる。   In the present embodiment, even when the above-described variation in shape occurs, the inner ring core 25 and the outer ring core 26 can be correctly aligned with respect to the direction of the longitudinal direction of the electromagnetic steel sheet. The stator 2 can be assembled by canceling the influence of the above.

また端板２７に周方向の位置決め基準の機能を持たせることによって次のような利点が生じる。即ち本実施形態のような構成を有するステータ２の場合、外輪コア２６に周方向の磁束を流す必要があり、外輪コア２６は径方向に一定の幅を設ける必要がある。従って周方向の位置決め基準を設けるのは容易である。しかし内輪コア２５の場合はティース２３において径方向に磁束を流す必要があるが、ティース２３の本数が多くなるとティース一本一本の幅は小さくならざるをえず、周方向の位置決め基準をティース２３に設けるのは困難である。   Further, by providing the end plate 27 with the function of the positioning reference in the circumferential direction, the following advantages arise. That is, in the case of the stator 2 having the configuration as in the present embodiment, it is necessary to flow a magnetic flux in the circumferential direction through the outer ring core 26, and the outer ring core 26 needs to have a certain width in the radial direction. Therefore, it is easy to provide a circumferential positioning reference. However, in the case of the inner ring core 25, it is necessary to flow a magnetic flux in the radial direction in the teeth 23. However, as the number of the teeth 23 increases, the width of each tooth must be reduced, and the circumferential positioning reference is determined by the teeth. 23 is difficult to provide.

また一部のティースの長さを変えたり、内輪コア２５と外輪コア２６の当接部の形状を変えるといった方法で周方向の位置決め基準を設けることもできるが、ティース２３ごとの磁束の流れにばらつきが生じてしまう。また各ティース２３を連結する内輪コア２５の内周の連結部２４に磁束が流れるとトルクが低下するため、連結部２４の幅は極力小さくする必要がある。さらに連結部２４の内周はロータ３と対向するため、形状にばらつきがあるとコギングトルクの増加などにつながる。以上より連結部２４の内周に周方向の位置決め基準を設けることは困難である。以上のように内輪コア２５においては、組立途中の状態において剛性が低く、電磁特性を低下させずに周方向の位置決め基準を設けることは非常に困難である。   In addition, it is possible to provide a circumferential positioning reference by changing the length of a part of the teeth or changing the shape of the contact portion between the inner ring core 25 and the outer ring core 26. Variation will occur. Further, since the torque is reduced when the magnetic flux flows through the connecting portion 24 on the inner periphery of the inner ring core 25 that connects the teeth 23, the width of the connecting portion 24 needs to be made as small as possible. Furthermore, since the inner periphery of the connecting portion 24 faces the rotor 3, variations in shape lead to an increase in cogging torque. As described above, it is difficult to provide a positioning reference in the circumferential direction on the inner periphery of the connecting portion 24. As described above, the inner ring core 25 has low rigidity in the middle of assembly, and it is very difficult to provide a circumferential positioning reference without deteriorating electromagnetic characteristics.

更に突起部４１を軸方向に曲げることで次のような効果がある。即ち通常端板２７はステータ２の電磁特性の向上に寄与しないため、ステータ２の軸方向の長さを小さくし、更にコイル２２の抵抗を低減するためにもなるべく薄肉とすることが好ましい。一方端板２７に設けた突起部４１をステータ２の組立の際の位置決め基準とするためには、軸方向における一定の寸法と剛性が必要であり、端板２７が薄板であった場合にはこの観点からは位置決め基準とすることは困難である。そこで本実施形態に示すように突起部４１を軸方向に曲げて構成することで、位置決め基準として必要な軸方向の寸法と剛性を確保できる。更にこれと同時に端板２７を薄板で形成することができ、従ってステータ２の軸方向の長さを短くして、コイル２２の抵抗を低減できる。   Furthermore, the following effects can be obtained by bending the protrusion 41 in the axial direction. That is, since the normal end plate 27 does not contribute to the improvement of the electromagnetic characteristics of the stator 2, it is preferable that the end plate 27 be as thin as possible in order to reduce the axial length of the stator 2 and further to reduce the resistance of the coil 22. On the other hand, in order to use the protrusion 41 provided on the end plate 27 as a positioning reference when the stator 2 is assembled, a certain size and rigidity in the axial direction are required. When the end plate 27 is a thin plate, From this point of view, it is difficult to use the positioning reference. Therefore, as shown in the present embodiment, the projection 41 is bent in the axial direction, whereby the axial dimension and rigidity necessary as a positioning reference can be secured. At the same time, the end plate 27 can be formed of a thin plate. Therefore, the axial length of the stator 2 can be shortened and the resistance of the coil 22 can be reduced.

また突起部の軸方向の折り曲げ角度は略直角に限らず、例えば図１５に示すように、略１８０度の折り曲げ角度にして突起部１０６を設けても良い。これにより突起部の剛性を確保することができる。更にはわずかであるが、突起部の軸方向寸法も平坦な場合に比べると確保することができる。尚上記においては、略１８０度の折り曲げ角度にした場合を示したが、他の角度、例えば１６０度等の角度であっても良い。   Further, the bending angle of the protruding portion in the axial direction is not limited to a substantially right angle, and the protruding portion 106 may be provided with a bending angle of approximately 180 degrees as shown in FIG. 15, for example. Thereby, the rigidity of a projection part is securable. Furthermore, although slightly, the axial dimension of the protrusion can be ensured as compared with a flat case. In the above description, the bending angle of about 180 degrees is shown, but other angles, such as an angle of 160 degrees, may be used.

以上の説明において、端板２７と端板２８は板金にて形成した例を示したが、端板２７と端板２８を樹脂等の絶縁部材で形成してもよい。端板２７と端板２８を樹脂で形成することにより、端板２７と端板２８を様々な形状で構成することができ、さらに端板２７と端板２８を絶縁部材とすることができるので、コイル２２と内輪コア２５間の絶縁を確保することができる。このように端板２７を樹脂で形成した場合、図１６に示すように、単なるブロック形状の突起部１０７を形成することが出来る。このようにブロック形状に形成することにより、折り曲げた場合よりも回転電機を組み立てる際の目印にし易く、組み立てやすいという利点がある。また端板２８を省略し、端板２７のみ用いることもできる。この場合、ステータ２の軸方向の長さをさらに短縮でき、コイル２２の抵抗を低減できる。   In the above description, the end plate 27 and the end plate 28 are formed of sheet metal, but the end plate 27 and the end plate 28 may be formed of an insulating member such as resin. By forming the end plate 27 and the end plate 28 from resin, the end plate 27 and the end plate 28 can be formed in various shapes, and the end plate 27 and the end plate 28 can be used as insulating members. Insulation between the coil 22 and the inner ring core 25 can be ensured. When the end plate 27 is formed of resin in this way, a simple block-shaped protrusion 107 can be formed as shown in FIG. By forming the block shape in this way, there is an advantage that it is easier to make a mark when assembling the rotating electrical machine than when it is bent, and it is easy to assemble. Further, the end plate 28 can be omitted and only the end plate 27 can be used. In this case, the axial length of the stator 2 can be further shortened, and the resistance of the coil 22 can be reduced.

実施の形態２．
図１７は実施の形態２によるステータにおける端板を示す斜視図である。本実施の形態においては、端板２７は凸形状の突起部を有するのではなく、内周側に凹形状の切欠き１１０を有する。端板２７はロータ３の挿入方向と反対側に位置するため、端板２７の内径は内輪コア２５の内径よりも小さくできる。そこで端板２７の内径を内輪コア２５の内径よりも小さくして連結部１１１の幅を大きくとり、更に連結部１１１の周方向の一部に凹形状の切欠き１１０を設ける。 Embodiment 2. FIG.
FIG. 17 is a perspective view showing an end plate in the stator according to the second embodiment. In the present embodiment, the end plate 27 does not have a convex protrusion, but has a concave notch 110 on the inner peripheral side. Since the end plate 27 is located on the side opposite to the insertion direction of the rotor 3, the inner diameter of the end plate 27 can be made smaller than the inner diameter of the inner ring core 25. Therefore, the inner diameter of the end plate 27 is made smaller than the inner diameter of the inner ring core 25 to increase the width of the connecting portion 111, and a concave notch 110 is provided in a part of the connecting portion 111 in the circumferential direction.

凹形状の切欠き１１０を設けることにより、内輪コア２５と外輪コア２６を組み合わせる際に、凹形状の切欠き１１０と外輪コア２６の外周の切欠き１０１に対して組立治具の位置決め基準を当てて両者を組立てることができる。これにより内輪コア２５と外輪コア２６の方向を正確に合わせて組み立てることができる。よって電磁鋼板における電磁特性のばらつきをなくし、更に形状のばらつきをキャンセルすることができ、性能のよい回転電機を得ることができる。   By providing the concave notch 110, when the inner ring core 25 and the outer ring core 26 are combined, the positioning reference of the assembly jig is applied to the notch 101 on the outer periphery of the concave notch 110 and the outer ring core 26. Can be assembled together. As a result, the inner ring core 25 and the outer ring core 26 can be assembled with the directions thereof accurately aligned. Therefore, variation in electromagnetic characteristics in the electromagnetic steel sheet can be eliminated, variation in shape can be canceled, and a rotating electrical machine with good performance can be obtained.

上記実施の形態１においては凸形状の突起部４１を目印にして内輪コア２５と外輪コア２６を正しく組み合わせた例を示したが、本実施形態においては、凹形状の切欠き１１０を目印にして内輪コア２５と外輪コア２６を正しく組み合わせるものである。
尚本発明は、その発明の範囲内において、各実施の形態を自由に組み合わせたり、各実施の形態を適宜、変形、省略したりすることが可能である。 In the first embodiment, the example in which the inner ring core 25 and the outer ring core 26 are correctly combined with the convex protrusion 41 as a mark is shown. However, in this embodiment, the concave notch 110 is used as a mark. The inner ring core 25 and the outer ring core 26 are correctly combined.
It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

１ 回転電機、２ ステータ、２２ コイル、２５ 内輪コア、２６ 外輪コア、
２７ 端板、４１ 突起部、１０１ 切欠き、１１０ 切欠き。 1 rotating electrical machine, 2 stator, 22 coil, 25 inner ring core, 26 outer ring core,
27 end plates, 41 protrusions, 101 notches, 110 notches.

Claims (7)

１つの電磁鋼板から打ち抜かれることによって形成された内輪コアと外輪コアとを有し、上記内輪コアを軸方向から上記外輪コアに圧入することにより形成される回転電機のステータであって、上記外輪コアには周方向の位置を認識するための指標を設け、上記内輪コアの軸方向一端部には端板を取り付けると共に上記端板には上記内輪コアを上記外輪コアに圧入する際に上記指標を基準に上記内輪コアの周方向の位置を決めるための目印を設けたことを特徴とする回転電機のステータ。 A stator of a rotating electrical machine having an inner ring core and an outer ring core formed by punching from one electromagnetic steel sheet, the inner ring core being press-fitted into the outer ring core from an axial direction, wherein the outer ring The core is provided with an index for recognizing the position in the circumferential direction, and an end plate is attached to one end of the inner ring core in the axial direction, and the end ring is pressed when the inner ring core is press-fitted into the outer ring core. A stator for a rotating electrical machine provided with a mark for determining a circumferential position of the inner ring core with reference to 上記目印は上記端板の内周側に設けられた突起部であることを特徴とする請求項１記載の回転電機のステータ。 The stator for a rotating electrical machine according to claim 1, wherein the mark is a protrusion provided on an inner peripheral side of the end plate. 上記突起部は軸方向に凸部を有することを特徴とする請求項２記載の回転電機のステータ。 The stator of a rotating electrical machine according to claim 2, wherein the protrusion has a protrusion in the axial direction. 上記目印は上記端板の内周側に設けられた凹形状の切欠きであることを特徴とする請求項１記載の回転電機のステータ。 2. A stator for a rotating electrical machine according to claim 1, wherein the mark is a concave notch provided on the inner peripheral side of the end plate. 上記端板を板金で形成したことを特徴とする請求項１から請求項４のいずれか１項に記載の回転電機のステータ。 The stator for a rotating electrical machine according to any one of claims 1 to 4, wherein the end plate is made of sheet metal. 上記端板を絶縁部材で形成したことを特徴とする請求項１から請求項４のいずれか１項に記載の回転電機のステータ。 The stator for a rotating electrical machine according to any one of claims 1 to 4, wherein the end plate is formed of an insulating member. 上記内輪コアに対して分布巻によりコイルを巻回したことを特徴とする請求項１から請求項６のいずれか１項に記載の回転電機のステータ。 The stator of the rotating electrical machine according to any one of claims 1 to 6, wherein a coil is wound around the inner ring core by distributed winding.
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