JP2007159300A - Stator of rotary electric machine - Google Patents

Stator of rotary electric machine Download PDF

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JP2007159300A
JP2007159300A JP2005352851A JP2005352851A JP2007159300A JP 2007159300 A JP2007159300 A JP 2007159300A JP 2005352851 A JP2005352851 A JP 2005352851A JP 2005352851 A JP2005352851 A JP 2005352851A JP 2007159300 A JP2007159300 A JP 2007159300A
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stator
laminated
stator core
welding
laminating
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Shinya Sano
新也 佐野
Hiroshi Aihara
浩 相原
Keiji Takizawa
敬次 滝澤
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Toyota Motor Corp
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator core fastening structure exhibiting good productivity in which planarity of the end face of a stator coil is ensured and electric loss is reduced, while sustaining sufficient precision of lamination thickness and inside diameter. <P>SOLUTION: A plurality of steel plates 11 are laminated and caulked in the laminating direction and a plurality of laminate blocks 10 are stacked, and then the surface of the side face is line welded in the laminating direction, or the laminate blocks are spot welded and integrated. Alternatively, surface of the side face is welded in the laminating direction and a plurality of laminate blocks are stacked, and then the laminate blocks 10 are caulked in the laminating direction and integrated. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、電動機の固定子コアの締結構造に関する。   The present invention relates to a fastening structure for a stator core of an electric motor.

近年、エンジンと電動機を組み合わせたハイブリッド自動車が多く製作されるようになってきている。このようなハイブリッド自動車に搭載されている駆動用の電動機は、磁界を発生される固定子２０と出力を取り出す可動子３とこれらを収納するケース２から構成されている。図４に示すように、電動機の固定子２０の固定子コア１は固定子コア１を通る磁界による誘導電流を低減させるために、電磁鋼板１１を積層して形成されている。   In recent years, many hybrid cars combining an engine and an electric motor have been manufactured. The electric motor for driving mounted in such a hybrid vehicle includes a stator 20 that generates a magnetic field, a mover 3 that extracts an output, and a case 2 that houses these. As shown in FIG. 4, the stator core 1 of the stator 20 of the electric motor is formed by laminating electromagnetic steel plates 11 in order to reduce the induced current caused by the magnetic field passing through the stator core 1.

従来、このような固定子２０は、次のようにして製作される。まず、定尺サイズの電磁鋼板を打ち抜き機構によって、コイルのスロット１５、ボルト孔１４のあいた耳金１２を有する固定子コア１の形状に打ち抜く。次に、打ち抜いた１００〜１５０枚の固定子形状の電磁鋼板１１を順次積層する。このとき、打ち抜きによる返りなどが同一方向に偏って、全体が傾いた形状に積層されないように、何枚かおきに電磁鋼板を固定子コアの周方向に一定角度ずつ回して積層していく。これを転積という。そして、カシメ部１３をプレス機でカシメて電磁鋼板１１を固定して固定子コア1を製作する（例えば、特許文献１参照）。出来上がった固定子コア１のスロット１５の中に絶縁紙を挿入してからコイルを巻く。コイルを巻くと固定子２０の両端面にはコイルエンド４が形成される。コイルエンドはコイル入れが終わった後のレーシング工程で、糸で縛って成形、固定される。コイル巻きが終了したら、固定子２０の全体にワニスを含浸させて、コイルをスロットに固定すると共に絶縁の強化を図る。組み立てられた固定子２０は図５に示すように電動機ケース２に固定ボルト５によって固定され、中心には可動子３が取り付けられる。このように、固定子コア１を構成する電磁鋼板はカシメによって固定された後、固定ボルト５によってケース２に固定されることによって全体形状が保持、固定されている。上記のカシメ固定を使わずに転積した後、図６に示すように固定子コア１の上下に取り付けた端面板２５にて固定子コア１を挟持し、積層鋼板の側面を溶接機２６によって溶接することによって固定子コア１を製作する場合もある（例えば、特許文献２参照）。   Conventionally, such a stator 20 is manufactured as follows. First, an electromagnetic steel plate of a standard size is punched out by a punching mechanism into the shape of the stator core 1 having the ear metal 12 with the coil slot 15 and the bolt hole 14 therebetween. Next, the punched 100 to 150 stator-shaped electromagnetic steel plates 11 are sequentially laminated. At this time, every several sheets are laminated by rotating the magnetic steel sheets by a certain angle in the circumferential direction of the stator core so that the return due to punching is biased in the same direction and the whole is not laminated in an inclined shape. This is called transversion. And the crimping part 13 is crimped with a press machine, the electromagnetic steel plate 11 is fixed, and the stator core 1 is manufactured (for example, refer patent document 1). The insulating paper is inserted into the slot 15 of the finished stator core 1 and then the coil is wound. When the coil is wound, coil ends 4 are formed on both end faces of the stator 20. The coil end is formed and fixed by tying with a thread in the lacing process after coiling is completed. When the coil winding is completed, the entire stator 20 is impregnated with varnish to fix the coil in the slot and to enhance insulation. As shown in FIG. 5, the assembled stator 20 is fixed to the motor case 2 with fixing bolts 5, and the movable element 3 is attached to the center. As described above, the magnetic steel sheet constituting the stator core 1 is fixed by caulking and then fixed to the case 2 by the fixing bolt 5 so that the entire shape is held and fixed. After rolling without using the caulking, the stator core 1 is sandwiched between end plates 25 attached to the top and bottom of the stator core 1 as shown in FIG. The stator core 1 may be manufactured by welding (see, for example, Patent Document 2).

特開２００３−２１９５８５号公報JP 2003-219585 A 特許２００３−１３６２８３号公報Japanese Patent No. 2003-136283

上記のように、電磁鋼板をカシメによって積層していく場合には、スプリングバック（積層戻り量）が大きく固定子コア１の厚さ精度、内径精度が悪くなることから、モーターの寸法が大きくなるいう問題があった。また、打ち抜き鋼板の返りなどが同一方向に偏って、全体が傾いた形状に積層されないように、何枚かおきに電磁鋼板を固定子コアの周方向に転積していく必要があるが、カシメ固定をしながら転積していく場合には、プレス機の型内で転積を行っていくことが必要になり製造効率が悪くなるという問題があった。一方、図６に示すように固定子コア１を溶接して製作する場合には、固定子コア１の厚さ誤差は、カシメにより製作する場合の半分程度になるが、溶接による縮み変形が発生するために、固定子端面の平面度が悪くなるという問題がある。固定子端面の平面度が悪くなると、コイル巻きの時に固定子２０の両端面に形成されるコイルエンド４と固定子端面の隙間にばらつきが生じ、規定よりも隙間が少ない部分が形成される。一方先に述べたように、コイルエンドはコイル入れが終わった後のレーシング工程において糸で縛って成形、固定する。この時、糸をつけた針を固定子コア１の表面とコイルの間に入れるために、この隙間が狭くなっていると、針かコイルに干渉して絶縁破壊などを起こしてしまうという問題や、隙間が少ないと、針自体が固定子コア１にぶつかって損傷を受けるという問題があった。更に、溶接を行うと溶接部において各鋼板の間を伝わった渦電流が発生するため、損失が大きくなり、燃費が悪くなるという問題があった。   As described above, when magnetic steel sheets are laminated by caulking, the spring back (stacking return amount) is large, and the thickness accuracy and inner diameter accuracy of the stator core 1 are deteriorated. There was a problem. In addition, it is necessary to roll the magnetic steel sheet in the circumferential direction of the stator core every other number so that the return of the punched steel sheet is biased in the same direction and the whole is not stacked in a tilted shape, In the case of rolling while fixing with caulking, there is a problem that it is necessary to carry out the rolling in the mold of the press machine and the production efficiency is deteriorated. On the other hand, when the stator core 1 is manufactured by welding as shown in FIG. 6, the thickness error of the stator core 1 is about half that of the case of manufacturing by caulking, but shrinkage deformation due to welding occurs. Therefore, there is a problem that the flatness of the end face of the stator is deteriorated. When the flatness of the stator end face is deteriorated, the gap between the coil end 4 formed on both end faces of the stator 20 and the stator end face is varied during coil winding, and a portion having a smaller gap than the standard is formed. On the other hand, as described above, the coil end is formed and fixed by tying with a thread in the lacing process after the coil insertion is completed. At this time, in order to put the needle with the thread between the surface of the stator core 1 and the coil, if this gap is narrow, there is a problem that the needle or coil interferes with it and causes dielectric breakdown or the like. When the gap is small, there is a problem that the needle itself collides with the stator core 1 and is damaged. Further, when welding is performed, eddy currents transmitted between the respective steel plates are generated in the welded portion, so that there is a problem that loss is increased and fuel consumption is deteriorated.

そこで、本発明の目的は、固定子コイル端面の平面度を確保し、積層厚さ精度、内径精度を十分に保持しつつ電気損失が少なく生産性が良い固定子コア締結構造を提供することにある。   Accordingly, an object of the present invention is to provide a stator core fastening structure that ensures the flatness of the end face of the stator coil, maintains the laminated thickness accuracy and the inner diameter accuracy sufficiently, and has low electrical loss and good productivity. is there.

本発明の目的は、ボルトによって支持部に取り付けられる回転電機の固定子において、固定子は、周方向に等間隔に配置された耳金を有する複数の鋼板を積層し、積層方向にカシメて積層固定した複数の積層ブロックを、耳金の位置を合わせて転積し、積層方向に対して側面の表面を溶接して積層一体化されたことによって達成することができる。また、各積層ブロック間を溶接することでも達成することができる。   It is an object of the present invention to provide a stator for a rotating electrical machine that is attached to a support portion by bolts. The stator is formed by laminating a plurality of steel plates having ear bars arranged at equal intervals in the circumferential direction and caulking in the laminating direction. A plurality of fixed laminated blocks can be achieved by rolling and aligning the positions of the metal ears, and by laminating and integrating the surfaces of the side surfaces in the laminating direction. It can also be achieved by welding the respective laminated blocks.

また、本発明の目的は、ボルトによって支持部に取り付けられる回転電機の固定子において、固定子は、周方向に等間隔に配置された耳金を有する複数の鋼板を積層し、積層方向に対して側面の表面を溶接して積層固定した複数の積層ブロックを、前記耳金の位置を合わせて転積し、各積層ブロックの間を積層方向にカシメて積層一体化されたことによっても達成することができる。   Another object of the present invention is to provide a stator for a rotating electrical machine that is attached to a support portion with bolts, and the stator is formed by laminating a plurality of steel plates having metal ears arranged at equal intervals in the circumferential direction. A plurality of laminated blocks which are laminated and fixed by welding the surface of the side surface are rolled up by aligning the positions of the metal ears, and the laminated blocks are caulked in the laminating direction to be laminated and integrated. be able to.

本発明による固定子コア１の構造は、生産性が良く、また、電気損失が少ないので燃費を高めることができるという効果を奏する。   The structure of the stator core 1 according to the present invention is advantageous in that the productivity is good and the fuel consumption can be improved because the electric loss is small.

以下に図面を用いて本発明に係る実施の形態につき、詳細に説明する。   Embodiments according to the present invention will be described below in detail with reference to the drawings.

図１は本発明の第１の実施形態における固定子コア１の製造過程を示す図である。固定子コア１は３つの積層ブロック１０を転積することによって構成されている。各積層ブロック１０は、従来技術で説明したのと同様、まず、定尺サイズの電磁鋼板を打ち抜き機構によって、コイル用のスロット１５、ボルト孔１４のあいた耳金１２を有する積層ブロック１０の形状に打ち抜き、打ち抜いた５０〜６０枚の固定子形状の電磁鋼板１１を順次積層してカシメ部１３をプレス機でカシメ固定して製作する。このようにして出来上がった積層ブロック１０を積層する。このとき、打ち抜きによる返りなどが同一方向に偏って、全体が傾いた形状に積層されないように、各ブロックを固定子コアの周方向に一定角度ずつ回して転積していく。転積は、各積層ブロックに構成されているボルト固定部１９の位置がそろうように回転させていく。第１の実施形態のようにボルト固定部１９が周方向に等分に３箇所ある場合には、各ブロックを１２０度ずつ回転させて積層していく方法がとられる。   FIG. 1 is a diagram showing a manufacturing process of the stator core 1 according to the first embodiment of the present invention. The stator core 1 is configured by rolling three laminated blocks 10. In the same manner as described in the prior art, each laminated block 10 is first formed into a shape of a laminated block 10 having a metal alloy plate of a fixed size by a punching mechanism and having an ear metal 12 having a coil slot 15 and a bolt hole 14. The punched and punched 50 to 60 stator-shaped electromagnetic steel plates 11 are sequentially laminated and the crimped portion 13 is crimped and fixed by a press. The laminated block 10 thus completed is laminated. At this time, each block is rolled by a certain angle in the circumferential direction of the stator core so that the return due to punching is biased in the same direction and the whole is not stacked in an inclined shape. The rolling is rotated so that the positions of the bolt fixing portions 19 formed in the respective laminated blocks are aligned. When there are three bolt fixing portions 19 equally in the circumferential direction as in the first embodiment, a method of rotating and stacking each block 120 degrees is used.

転積した各ブロックはその外面を線溶接１７によって固定される。溶接は、図６に示すように、固定子コア１の上下に取り付けた端面板２５にて固定子コア１を挟持し、積層鋼板の側面を積層方向に対し側面の表面にＴｉＧ溶接などによって溶接する。溶接は、表面のごく薄い部分を溶接し、溶接部における渦電流の発生、鉄損の増加を最小限に抑えるようにしている。また、固定子端面の平面度を確保するために、固定子コア１の端面を構成する鋼板の一部である固定子端部６は溶接しないようにして組みたてる。   The outer surface of each rolled block is fixed by wire welding 17. As shown in FIG. 6, welding is performed by sandwiching the stator core 1 with end plates 25 attached to the top and bottom of the stator core 1, and welding the side surfaces of the laminated steel plates to the side surfaces with respect to the lamination direction by TiG welding or the like. To do. In welding, a very thin portion of the surface is welded to minimize generation of eddy currents and increase in iron loss in the weld. Further, in order to ensure the flatness of the stator end surface, the stator end 6 which is a part of the steel plate constituting the end surface of the stator core 1 is assembled without being welded.

上記のように、各積層ブロック１０をカシメによって固定した後、転積組み立てすることによってプレス機械の型内において転積をする必要がなくなることにより、生産効率を大きく向上させることができる。また、固定子コア１は固定子コア１の端面を構成する鋼板の一部６を除く部分を線溶接によって溶接して全体の組み立てを行うことにより、固定子コア１の端面の平面度を損なうことなく全体組み立てが可能となることから、固定子コア１の端面とコイルエンドの隙間に狭隘部分ができないため、レーシング工程において、針がコイルに干渉して絶縁破壊などを起こしたり、針自体が固定子コア１にぶつかって損傷を受けたりするということがなくなり品質、生産効率が向上する効果を奏する。更に、最終組み立て段階において、図６に示すように、全体を固定、保持して溶接固定することから、この保持、固定のときに内径の最終調整が可能となり、完成時の内径精度が全体をカシメ固定で製作する場合に比較して向上させることができ、回転電機全体の寸法を抑えることが可能となる。本発明の第１の実施形態では、固定子コア１を複数の同一形状のブロックを転積して組み立てることから、組み立てたブロックに汎用性があり、使いまわすことによって製造効率を向上させることができる。以上のように、本発明の第１の実施形態は、生産性、品質の向上、寸法を抑えられるという多くの効果を奏する一方、固定子コア１の側面を溶接することによる渦電損失が若干発生することがある。従って、本発明の第１の実施形態の固定子コアは、電動機の出力に対して渦電流損失があまり問題にならない場合に最適のものとなる。   As described above, after each laminated block 10 is fixed by caulking, it is not necessary to carry out the rolling in the die of the press machine by rolling and assembling, so that the production efficiency can be greatly improved. Moreover, the stator core 1 impairs the flatness of the end face of the stator core 1 by performing overall assembly by welding the portions excluding the part 6 of the steel plate constituting the end face of the stator core 1 by wire welding. Since the entire assembly is possible without a narrow portion between the end face of the stator core 1 and the coil end, the needle interferes with the coil in the racing process, causing dielectric breakdown, etc. The stator core 1 will not be damaged by being damaged, and the quality and production efficiency will be improved. Further, in the final assembly stage, as shown in FIG. 6, since the whole is fixed, held and fixed by welding, the final adjustment of the inner diameter becomes possible at the time of holding and fixing, and the accuracy of the inner diameter at the time of completion is improved. This can be improved as compared with the case of manufacturing by caulking, and the overall size of the rotating electrical machine can be suppressed. In the first embodiment of the present invention, since the stator core 1 is assembled by rolling a plurality of blocks having the same shape, the assembled blocks have versatility and can be used to improve manufacturing efficiency. it can. As described above, the first embodiment of the present invention has many effects that productivity, quality, and size can be suppressed, while eddy current loss due to welding of the side surface of the stator core 1 is slightly increased. May occur. Therefore, the stator core according to the first embodiment of the present invention is optimal when eddy current loss is not a problem with respect to the output of the motor.

本発明の第２の実施形態は、図２に示すように、固定子コアの外面の各ブロック間を点溶接し固定子全体を組み立てることとしたものである。このようにすることによって、第１の実施形態のような線溶接１７によって発生する渦電流損失を低減することができるという効果を奏する。そして、回転電機の容量が大きくなる場合には、点溶接の個所数を増加させて、接続強度を確保することができる。   In the second embodiment of the present invention, as shown in FIG. 2, the entire stator is assembled by spot welding between the blocks on the outer surface of the stator core. By doing in this way, there exists an effect that the eddy current loss which generate | occur | produces by the wire welding 17 like 1st Embodiment can be reduced. And when the capacity | capacitance of a rotary electric machine becomes large, the number of points of spot welding can be increased and connection strength can be ensured.

図３に示すように、本発明の第３の実施形態は、各ブロックの組み立てを線溶接１７によって行い、各ブロック間の固定接をカシメによって行うものである。各ブロックは、第１の実施形態と同様に、定尺サイズの電磁鋼板を打ち抜き機構によって、コイル用のスロット１５、ボルト孔１４のあいた耳金１２を有する積層ブロック１０の形状に打ち抜き、打ち抜いた５０〜６０枚の固定子形状の電磁鋼板１１を順次積層した後、各ブロックの側面を溶接１７によって固定する。このようにして出来上がった積層ブロック１０を第１の実施形態と同様に転積し、各ブロックの間のブロックあわせ面２１をカシメによって固定することによって、全体を組み立てる。本発明の第３の実施形態は、各ブロックを線溶接によって組み立てるため、固定子コア１の内径精度、真直度を確保することができ、積層が容易であるという効果がある。また、組み立て工程全体にわたってプレス機によるカシメを行うことが少ないことからこれによって生産性が向上するという効果も有する。   As shown in FIG. 3, in the third embodiment of the present invention, each block is assembled by wire welding 17 and fixed contact between each block is performed by caulking. As in the first embodiment, each block is punched by punching a steel sheet of a standard size into the shape of the laminated block 10 having the ear metal 12 with the coil slot 15 and the bolt hole 14 by the punching mechanism. After sequentially stacking 50 to 60 stator-shaped electromagnetic steel plates 11, the side surfaces of each block are fixed by welding 17. The laminated block 10 thus completed is rolled up in the same manner as in the first embodiment, and the entire block is assembled by fixing the block alignment surface 21 between the blocks by caulking. In the third embodiment of the present invention, since the blocks are assembled by wire welding, the inner diameter accuracy and straightness of the stator core 1 can be ensured, and the lamination is easy. Moreover, since there is little caulking with a press machine throughout the assembly process, this also has the effect of improving productivity.

本発明は、固定子を有する回転電機であれば、電動機に限らず適用することができる。   The present invention can be applied not only to an electric motor, but also to a rotating electric machine having a stator.

本発明の第１の実施形態における固定子コアの製造過程を示す図である。It is a figure which shows the manufacturing process of the stator core in the 1st Embodiment of this invention. 本発明の第２の実施形態における固定子コアの斜視図である。It is a perspective view of the stator core in the 2nd Embodiment of this invention. 本発明の第３の実施形態における固定子コアの製造過程を示す図である。It is a figure which shows the manufacturing process of the stator core in the 3rd Embodiment of this invention. 従来技術による固定子コアの斜視図である。It is a perspective view of the stator core by a prior art. 従来技術による電動機の断面図である。It is sectional drawing of the electric motor by a prior art. 従来技術による固定子コアの溶接を示す説明図である。It is explanatory drawing which shows welding of the stator core by a prior art.

符号の説明Explanation of symbols

１ 固定子コア、２ ケース、３ 可動子、４ コイルエンド、５ 固定ボルト、６ 固定子端部、１０ 積層ブロック、１１、１１ａ、１１ｂ 電磁鋼板、１２ 耳金、１３ カシメ部、１４ ボルト孔、１５ スロット、１６ 第１の積層ブロック、１７ 線溶接、１８ 点溶接、１９ ボルト固定部、２０ 固定子、２１ ブロックあわせ面、２５ 端面板、２６ 溶接機、３０ 着座面。   DESCRIPTION OF SYMBOLS 1 Stator core, 2 Case, 3 Mover, 4 Coil end, 5 Fixing bolt, 6 End of stator, 10 Laminated block, 11, 11a, 11b Electrical steel plate, 12 Ear metal, 13 Caulking part, 14 Bolt hole, 15 slots, 16 first laminated block, 17-wire welding, 18-point welding, 19 bolt fixing part, 20 stator, 21 block mating surface, 25 end face plate, 26 welding machine, 30 seating surface.

Claims (3)

ボルトによって支持部に取り付けられる回転電機の固定子において、
前記固定子は、周方向に等間隔に配置された耳金を有する複数の鋼板を積層し、積層方向にカシメて積層固定した複数の積層ブロックを、前記耳金の位置を合わせて転積し、積層方向に対して側面の表面を溶接して積層一体化されたこと
を特徴とする回転電機の固定子。 In the stator of the rotating electrical machine attached to the support portion by bolts,
The stator is formed by laminating a plurality of steel plates having metal bars arranged at equal intervals in the circumferential direction and caulking in the laminating direction and fixing a plurality of laminated blocks by aligning the positions of the metal ears. A stator for a rotating electric machine, wherein the side surfaces are welded to the stacking direction to be stacked and integrated. 各積層ブロックは、各積層ブロックの間の積層方向に対して側面の表面を溶接して積層一体化されたこと
を特徴とする請求項１に記載の回転電機の固定子。 The stator of a rotating electrical machine according to claim 1, wherein each of the laminated blocks is laminated and integrated by welding the surface of the side surface with respect to the lamination direction between the laminated blocks. ボルトによって支持部に取り付けられる回転電機の固定子において、
前記固定子は、周方向に等間隔に配置された耳金を有する複数の鋼板を積層し、積層方向に対して側面の表面を溶接して積層固定した複数の積層ブロックを、前記耳金の位置を合わせて転積し、各積層ブロックの間を積層方向にカシメて積層一体化されたこと
を特徴とする回転電機の固定子。 In the stator of the rotating electrical machine attached to the support portion by bolts,
The stator is formed by laminating a plurality of steel plates having metal bars arranged at equal intervals in the circumferential direction, and welding a plurality of laminated blocks fixed by laminating and fixing the surface of the side surface in the laminating direction. A stator for a rotating electrical machine characterized by being rolled and rolled in alignment, and being laminated and integrated by caulking between the stacked blocks in the stacking direction.
JP2005352851A 2005-12-07 2005-12-07 Stator of rotary electric machine Withdrawn JP2007159300A (en)

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CN107404201A (en) * 2016-05-19 2017-11-28 株式会社三井高科技 The manufacture method of laminate core
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CN111064294A (en) * 2018-10-17 2020-04-24 日本电产株式会社 Stator core and motor
US11201518B2 (en) 2018-10-17 2021-12-14 Nidec Corporation Stator core including recessed portion, projecting portion, and welded portion, and motor including same
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