JP2010178598A - Rotary electric machine - Google Patents

Rotary electric machine Download PDF

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JP2010178598A
JP2010178598A JP2009021724A JP2009021724A JP2010178598A JP 2010178598 A JP2010178598 A JP 2010178598A JP 2009021724 A JP2009021724 A JP 2009021724A JP 2009021724 A JP2009021724 A JP 2009021724A JP 2010178598 A JP2010178598 A JP 2010178598A
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stator core
metal case
electrical machine
rotating electrical
groove
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Nobuo Sakate
宣夫 坂手
Toshiyuki Gendo
俊行 玄道
Hisayuki Momijishima
寿行 椛嶌
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Mazda Motor Corp
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Mazda Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To enhance thermal conductivity between a stator core and a metal case, without making the magnetic properties of a magnetic steel sheet deteriorate greatly in a joined part, when joining the stator core and the metal case. <P>SOLUTION: A rotary electric machine includes the stator core with a plurality of magnetic steel sheets laminated in the axial direction of a rotor, and a cylindrical metal case where the stator core is inserted. The joined part is formed by friction-stir welding the stator core and the metal case. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、電動機、発電機といった回転電機に関する。   The present invention relates to a rotating electrical machine such as an electric motor and a generator.

回転電機のステータコアは複数枚の電磁鋼板を積層して形成される。電磁鋼板の積層工程では、通常、１枚積層する毎に電磁鋼板表面の所定位置にプレスによって微小な凹部を形成する（裏面では凸部となる）、所謂、カシメにより電磁鋼板間を係合する方法が採用されることが多い。このカシメによる係合は、電磁鋼板間の位置ズレを防止する効果がある。また、電磁鋼板間をより強固に固定する方法としては、ステータコア外周面を溶接することも提案されている（特許文献１）。   A stator core of a rotating electrical machine is formed by laminating a plurality of electromagnetic steel plates. In the process of laminating electromagnetic steel sheets, each time one sheet is laminated, a minute concave portion is formed by pressing at a predetermined position on the surface of the electromagnetic steel plate (becomes a convex portion on the back surface). The method is often adopted. This engagement by caulking has the effect of preventing misalignment between the electromagnetic steel sheets. In addition, as a method for more firmly fixing the magnetic steel sheets, it is also proposed to weld the outer peripheral surface of the stator core (Patent Document 1).

上記のカシメ等により電磁鋼板間を係合した場合には、更に、ステータコア全体を固定する必要がある。ステータコア全体を固定する方法として、筒状の金属ケースにステータコアを圧入、焼嵌めすることが提案されている（特許文献２及び３）。   When the electromagnetic steel plates are engaged by the above-described caulking or the like, it is further necessary to fix the entire stator core. As a method of fixing the entire stator core, it has been proposed to press-fit and shrink-fit the stator core in a cylindrical metal case (Patent Documents 2 and 3).

特開平２−２２０７９０号公報JP-A-2-220790 特開平７−６７２９２号公報Japanese Patent Laid-Open No. 7-67292 特開２００８−８６１７２号公報JP 2008-86172 A

しかし、筒状の金属ケースにステータコアを圧入、焼嵌めすると、ステータコアにはロータ中心方向に向かう圧縮応力が残留する。電磁鋼板の性質上、このような圧縮応力は電磁鋼板の磁気特性を悪化させる場合がある。また、回転電機の放熱性を考慮すると、圧入や焼嵌めを行った場合のように、ステータコアと金属ケースとが機械的に接触しているよりも、溶接した場合のように、冶金的に接合されている方がステータコアと金属ケースとの間の熱伝導性の点で有利である。しかし、ステータコアと金属ケースとを溶接すると、溶接部位においては電磁鋼板の溶融によって、大きな熱歪に伴う残留応力が発生して、その磁気特性が悪化する場合があり、これを回復させるためには焼鈍処理が必要となる。   However, when the stator core is press-fitted and shrink-fitted into the cylindrical metal case, a compressive stress toward the rotor center remains in the stator core. Due to the properties of the electrical steel sheet, such compressive stress may deteriorate the magnetic properties of the electrical steel sheet. In addition, considering the heat dissipation of the rotating electrical machine, it is metallurgically bonded as in the case of welding rather than in mechanical contact between the stator core and the metal case as in press fitting or shrink fitting. This is advantageous in terms of thermal conductivity between the stator core and the metal case. However, when the stator core and the metal case are welded, there is a case where residual stress accompanying large thermal strain is generated due to melting of the magnetic steel sheet at the welded portion, and the magnetic properties thereof may be deteriorated. An annealing treatment is required.

本発明の目的は、ステータコアと金属ケースとを接合するにあたり、接合部において電磁鋼板の磁気特性を大きく悪化させることなく、ステータコアと金属ケースとの間の熱伝導性を向上することにある。   An object of the present invention is to improve the thermal conductivity between the stator core and the metal case without greatly deteriorating the magnetic properties of the electromagnetic steel sheet at the joint when joining the stator core and the metal case.

本発明によれば、ロータの軸方向に積層された複数の電磁鋼板を備えたステータコアと、前記ステータコアが挿入される筒状の金属ケースと、を備えた回転電機において、前記ステータコアと前記金属ケースとを摩擦攪拌接合した接合部を備えたことを特徴とする回転電機が提供される。   According to the present invention, in a rotating electrical machine including a stator core including a plurality of electromagnetic steel plates stacked in the axial direction of a rotor, and a cylindrical metal case into which the stator core is inserted, the stator core and the metal case There is provided a rotating electrical machine including a joint portion obtained by friction stir welding.

摩擦攪拌接合は材料を塑性流動させて練り混ぜることで部材間を接合するので、溶接の場合のように電磁鋼板を溶融することがなく、したがって、接合部において大きな熱歪が発生しないので電磁鋼板の磁気特性を大きく悪化させることがない。また、ステータコアと金属ケースの各部材が冶金的に接合されているので、これらが単に機械的に接触している場合よりも熱伝導性を向上でき、ひいて回転電機の冷却性能を向上できる。   Friction stir welding joins members by plastic mixing and kneading materials, so it does not melt magnetic steel sheets as in the case of welding, and therefore, large thermal strain does not occur at the joints. The magnetic properties are not greatly deteriorated. In addition, since each member of the stator core and the metal case is joined metallurgically, the thermal conductivity can be improved as compared with the case where they are merely mechanically contacted, thereby improving the cooling performance of the rotating electrical machine.

また、本発明においては、前記金属ケースが、その外周面に、深さ方向が前記ロータの径方向である溝を備え、前記接合部が前記溝の底部と前記ステータコアとを接合していてもよい。この構成によれば、前記溝により前記金属ケースの表面積が増すことに伴って放熱性が向上でき、回転電機の冷却性能を更に向上できる。また、相対的に薄肉となる前記溝の底部を接合部とすることで、摩擦攪拌接合を、より容易にかつ確実に行うことができる。   In the present invention, the metal case may include a groove on the outer peripheral surface thereof whose depth direction is the radial direction of the rotor, and the joint portion joins the bottom portion of the groove and the stator core. Good. According to this configuration, the heat dissipation can be improved as the surface area of the metal case is increased by the groove, and the cooling performance of the rotating electrical machine can be further improved. Further, by using the bottom portion of the groove, which is relatively thin, as the joint portion, the friction stir welding can be performed more easily and reliably.

また、本発明においては、前記溝を液密に覆い、冷却水通路を形成する通路形成部材を備えてもよい。この構成によれば、回転電機を水冷で冷却できる。   Moreover, in this invention, you may provide the channel | path formation member which covers the said groove | channel liquid-tightly and forms a cooling water channel | path. According to this configuration, the rotating electrical machine can be cooled by water cooling.

また、本発明においては、前記金属ケースの内径は、前記ステータコアが遊嵌される大きさを有し、前記摩擦攪拌接合は、前記ステータコアが加熱されてその外周面が前記金属ケースの内周面に接触した状態で行われたものであってもよい。この構成によれば、前記ステータコアに引張応力を残留させることができ、電磁鋼板の磁気特性を向上できる。   In the present invention, the inner diameter of the metal case has such a size that the stator core is loosely fitted, and the friction stir welding is performed by heating the stator core so that the outer peripheral surface thereof is the inner peripheral surface of the metal case. It may be performed in a state in contact with. According to this configuration, tensile stress can remain in the stator core, and the magnetic properties of the electrical steel sheet can be improved.

以上述べた通り、本発明によれば、ステータコアと金属ケースとを接合するにあたり、接合部において電磁鋼板の磁気特性を大きく悪化させることなく、ステータコアと金属ケースとの間の熱伝導性を向上することができる。   As described above, according to the present invention, when the stator core and the metal case are joined, the thermal conductivity between the stator core and the metal case is improved without greatly deteriorating the magnetic properties of the electromagnetic steel sheet at the joint. be able to.

（ａ）は本発明の一実施形態に係る回転電機Ａの断面図、（ｂ）は図１（ａ）の線Ｘ−Ｘに沿う回転電機Ａの断面図である。(A) is sectional drawing of the rotary electric machine A which concerns on one Embodiment of this invention, (b) is sectional drawing of the rotary electric machine A which follows the line XX of Fig.1 (a). （ａ）は電磁鋼板２３の斜視図、（ｂ）は電磁鋼板２３'の斜視図、（ｃ）は金属ケース４０の斜視図である。(A) is a perspective view of the electromagnetic steel plate 23, (b) is a perspective view of the electromagnetic steel plate 23 ′, and (c) is a perspective view of the metal case 40. （ａ）は金属ケース４０の外周面の展開図、（ｂ）は摩擦攪拌接合の説明図である。(A) is an expanded view of the outer peripheral surface of the metal case 40, (b) is explanatory drawing of friction stir welding. ステータコア２０の残留応力の説明図である。FIG. 6 is an explanatory diagram of residual stress of the stator core 20. 別の実施形態である金属ケース４０'の外周面の展開図である。It is an expanded view of the outer peripheral surface of metal case 40 'which is another embodiment.

図１（ａ）は本発明の一実施形態に係る回転電機Ａの断面図、図１（ｂ）は図１（ａ）の線Ｘ−Ｘに沿う回転電機Ａの断面図である。回転電機Ａは、電動機又は発電機であって、ロータ１０と、ステータコア２０と、金属ケース４０と、通路形成部材５０と、を備える。ロータ１０は、ロータ軸１１とロータ軸の周囲に配設された複数個の永久磁石（不図示）と、を備える。以下、軸方向、周方向、径方向と言うときは、特に断らない限り、ロータ１０の軸方向、周方向、径方向を指すものとする。   FIG. 1A is a cross-sectional view of a rotating electrical machine A according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view of the rotating electrical machine A along line XX of FIG. The rotating electrical machine A is an electric motor or a generator, and includes a rotor 10, a stator core 20, a metal case 40, and a passage forming member 50. The rotor 10 includes a rotor shaft 11 and a plurality of permanent magnets (not shown) disposed around the rotor shaft. Hereinafter, the axial direction, the circumferential direction, and the radial direction refer to the axial direction, the circumferential direction, and the radial direction of the rotor 10 unless otherwise specified.

ステータコア２０は、ロータ１０と同心円筒状のヨーク部２２と、ヨーク部２２から径方向内方に突出し、ヨーク部２２の周方向に等間隔で複数（本実施形態では８つ）設けられたティース部２１と、を備え、各ティース部２１にはコイル３０が巻き回されている。ステータコア２０は、軸方向に積層された複数の電磁鋼板２３の積層体である。図２（ａ）は電磁鋼板２３の斜視図であり、ティース部２１を構成する部分とヨーク部２２を構成する部分とが一体に形成され、常温におけるその外径はＤ１である。   The stator core 20 has a cylindrical yoke portion 22 concentric with the rotor 10 and teeth that protrude radially inward from the yoke portion 22 and are provided at equal intervals in the circumferential direction of the yoke portion 22 (eight in this embodiment). And a coil 30 is wound around each tooth portion 21. The stator core 20 is a laminate of a plurality of electromagnetic steel plates 23 laminated in the axial direction. FIG. 2A is a perspective view of the electromagnetic steel sheet 23, in which the portion constituting the tooth portion 21 and the portion constituting the yoke portion 22 are integrally formed, and the outer diameter thereof at room temperature is D1.

本実施形態では、周方向には１つの電磁鋼板２３を軸方向に積層してステータコア２０を形成したが、周方向に均等に分割された電磁鋼板を用いてもよい。図２（ｂ）は周方向に均等に分割された電磁鋼板の例を示す斜視図であり、電磁鋼板２３'は複数の要素２３ａ'乃至２３ｄ'を環状に配置してなる。   In the present embodiment, one electromagnetic steel plate 23 is laminated in the circumferential direction in the circumferential direction to form the stator core 20, but electromagnetic steel plates that are equally divided in the circumferential direction may be used. FIG. 2B is a perspective view showing an example of an electromagnetic steel plate equally divided in the circumferential direction. The electromagnetic steel plate 23 ′ is formed by arranging a plurality of elements 23a ′ to 23d ′ in an annular shape.

図１（ａ）及び（ｂ）を参照して、金属ケース４０は例えばアルミ合金製であり、ステータコア２０が挿入される筒状体をなしている。図１（ａ）及び（ｂ）においては、ステータコア２０の軸方向の両端部が開放されているが、各端部にはロータ軸１１を軸支する端部部材（不図示）が設けられる。端部部材は金属ケース４０と別体で金属ケース４０に固定することで構成できるが、端部部材の一方は金属ケース４０と一体であってもよい。   1A and 1B, the metal case 40 is made of, for example, an aluminum alloy, and forms a cylindrical body into which the stator core 20 is inserted. In FIGS. 1A and 1B, both end portions of the stator core 20 in the axial direction are open, but end members (not shown) for supporting the rotor shaft 11 are provided at the respective end portions. The end member can be configured by being fixed to the metal case 40 separately from the metal case 40, but one of the end members may be integrated with the metal case 40.

図２（ｃ）は金属ケース４０の斜視図である。金属ケース４０は、常温におけるその内径がＤ２である内部空間と、複数の溝４１及び４２が形成された外周面と、を備える。溝４１及び溝４２は、いずれもその深さ方向が径方向であり、溝４１は軸方向と平行に形成され、溝４２は周方向に形成されている。本実施形態の場合、溝４１はティース部２１と同数（ここでは８つ）形成されている。図３（ａ）は金属ケース４０の外周面を周方向に展開した展開図である。溝４２は溝４１の一方端部同士又は他方端部同士と交互に連結されており、複数の溝４１及び４２で一本の通路を形成している。   FIG. 2C is a perspective view of the metal case 40. The metal case 40 includes an internal space whose inner diameter is D2 at room temperature, and an outer peripheral surface on which a plurality of grooves 41 and 42 are formed. The groove 41 and the groove 42 both have a radial direction in the depth direction, the groove 41 is formed in parallel with the axial direction, and the groove 42 is formed in the circumferential direction. In the case of this embodiment, the grooves 41 are formed in the same number (eight here) as the teeth portions 21. FIG. 3A is a development view in which the outer peripheral surface of the metal case 40 is developed in the circumferential direction. The grooves 42 are alternately connected to one end portions or the other end portions of the grooves 41, and a plurality of grooves 41 and 42 form a single passage.

図１（ａ）及び（ｂ）を参照して、ステータコア２０と、金属ケース４０と、は接合部６０において互いに接合されている。接合部６０はステータコア２０と金属ケース４０とを摩擦攪拌接合により接合した部分である。本実施形態の場合、接合部６０は、溝４１の底部４１ａとステータコア２０の外周面とを接合しており、溝４１の長手方向に直線状に連続した状態で、周方向に複数個が形成されている。図３（ａ）において破線で囲む部分は接合部６０となる部分を示す。   With reference to FIGS. 1A and 1B, the stator core 20 and the metal case 40 are joined to each other at a joint 60. The joint portion 60 is a portion where the stator core 20 and the metal case 40 are joined by friction stir welding. In the case of this embodiment, the joint portion 60 joins the bottom 41a of the groove 41 and the outer peripheral surface of the stator core 20, and a plurality of joint portions 60 are formed in the circumferential direction in a state of being linearly continuous in the longitudinal direction of the groove 41. Has been. In FIG. 3A, a portion surrounded by a broken line indicates a portion that becomes the joint portion 60.

図１（ａ）及び（ｂ）を参照して、通路形成部材５０は、本実施形態の場合、金属ケース４０が挿入される円筒状をなし、金属製である。通路形成部材５０は、金属ケース４０の外周面のうち、溝４１及び４２を形成していない部分に接合され、これにより溝４１及び４２を液密に覆い、冷却水通路を形成する。金属ケース４０と通路形成部材５０との接合は、圧入、溶接が挙げられるが、本実施形態ではステータコア２０と金属ケース４０とを摩擦攪拌接合するので、金属ケース４０と通路形成部材５０との接合も摩擦攪拌接合とすることが好ましい。通路形成部材５０のうち、溝４１及び４２で形成される通路の各端部に対峙する部分には、不図示の開口が形成され、ここに配管を接続することで、溝４１及び４２並びに通路形成部材５０で囲まれた冷却水通路に冷却水を循環することができる。   Referring to FIGS. 1A and 1B, in the case of this embodiment, the passage forming member 50 has a cylindrical shape into which the metal case 40 is inserted, and is made of metal. The passage forming member 50 is joined to a portion of the outer peripheral surface of the metal case 40 where the grooves 41 and 42 are not formed, thereby covering the grooves 41 and 42 in a liquid-tight manner to form a cooling water passage. The metal case 40 and the passage forming member 50 may be joined by press-fitting or welding. However, in the present embodiment, the stator core 20 and the metal case 40 are friction stir welded, so the metal case 40 and the passage forming member 50 are joined. Is also preferably friction stir welding. An opening (not shown) is formed in a portion of the passage forming member 50 that faces each end of the passage formed by the grooves 41 and 42, and a pipe is connected to the opening to connect the grooves 41 and 42 and the passage. Cooling water can be circulated through the cooling water passage surrounded by the forming member 50.

次に、回転電機Ａの製造手順の例について説明する。回転電機Ａは、例えば、ステータコア２０の作成、ステータコア２０と金属ケース４０との摩擦攪拌接合、金属ケース４０と通路形成部材５０との接合、コイル３０の組み付け、ロータ１０の組み付け、という手順で製造できる。   Next, an example of the manufacturing procedure of the rotating electrical machine A will be described. The rotating electrical machine A is manufactured by, for example, the following steps: creation of the stator core 20, friction stir welding between the stator core 20 and the metal case 40, joining between the metal case 40 and the passage forming member 50, assembly of the coil 30, and assembly of the rotor 10. it can.

ステータコア２０と金属ケース４０との摩擦攪拌接合の例について説明する。図３（ｂ）は摩擦攪拌接合の説明図であり、ステータコア２０と金属ケース４０との摩擦攪拌接合方法の一例を示す。同図の例では、工具７０を金属ケース４０の外周側から溝４１の底部４１ａに工具７０を回転させながら押し当て、溝４１の長手方向に移動させている。工具７０は円柱状の本体部分７１と、本端部分７１から突起した円柱状の突起部分７２と、を備える。金属ケース４０をアルミ合金製とし、底部４１ａの厚みを６ｍｍとした場合、工具７０としては、例えば、ＳＫＤ６１からなり、本体部分７１の直径が２０ｍｍ、突起部分７２の直径が５ｍｍ、突出長さが５ｍｍのものを利用できる。この場合、工具７０の回転数は例えば８００ｒｐｍ、移動速度は例えば２００ｍｍ／ｍｉｎ、底部４１ａの表面からの押し込み深さは５．５ｍｍとすることができる。   An example of friction stir welding between the stator core 20 and the metal case 40 will be described. FIG. 3B is an explanatory diagram of the friction stir welding, and shows an example of the friction stir welding method between the stator core 20 and the metal case 40. In the example of the figure, the tool 70 is pressed from the outer peripheral side of the metal case 40 to the bottom 41 a of the groove 41 while rotating the tool 70 and moved in the longitudinal direction of the groove 41. The tool 70 includes a columnar main body portion 71 and a columnar protruding portion 72 protruding from the main end portion 71. When the metal case 40 is made of an aluminum alloy and the thickness of the bottom portion 41a is 6 mm, the tool 70 is made of, for example, SKD61, the diameter of the main body portion 71 is 20 mm, the diameter of the protruding portion 72 is 5 mm, and the protruding length is 5 mm can be used. In this case, the rotational speed of the tool 70 can be set to, for example, 800 rpm, the moving speed can be set to, for example, 200 mm / min, and the indentation depth from the surface of the bottom 41a can be set to 5.5 mm.

ここで、常温における金属ケース４０の内径Ｄ２は、常温におけるステータコア２０の外径Ｄ１よりも大きくしてステータコア２０が遊嵌される大きさを有することが好ましい。この遊嵌される大きさ（外径Ｄ１と内径Ｄ２との寸法差）は、例えば１００μｍ〜２００μｍが好ましい。この場合、両者の摩擦攪拌接合の際に、ステータコア２０が金属ケース４０に挿入された状態で、ステータコア２０を加熱して外径Ｄ１が内径Ｄ２に略一致するように、つまり、ステータコア２０の外周面が金属ケース４０の内周面に全体的に接触するように膨張させる。そして、この状態で、ステータコア２０と金属ケース４０との摩擦攪拌接合を行う。   Here, the inner diameter D2 of the metal case 40 at normal temperature is preferably larger than the outer diameter D1 of the stator core 20 at normal temperature so that the stator core 20 is loosely fitted. The loosely fitted size (the dimensional difference between the outer diameter D1 and the inner diameter D2) is preferably, for example, 100 μm to 200 μm. In this case, the stator core 20 is heated in the state in which the stator core 20 is inserted into the metal case 40 during the friction stir welding, so that the outer diameter D1 substantially matches the inner diameter D2, that is, the outer periphery of the stator core 20 The surface is inflated so that the entire surface contacts the inner peripheral surface of the metal case 40. In this state, the friction stir welding between the stator core 20 and the metal case 40 is performed.

このようにして摩擦攪拌接合を行うと、ステータコア２０が常温に戻ったとき、ステータコア２０の収縮が接合部６０を介して金属ケース４０によって妨げられ、ステータコア２０に内部応力が残留する。図４はステータコア２０の残留応力の説明図である。ステータコア２０には接合部６０において矢印ｄ１で示すように径方向外方の応力が作用し、ステータコア２０を拡径させる応力が常時作用する。この結果、ヨーク部２２には、矢印ｄ２で示すように周方向の引張応力が作用し、この力の方向は磁束が流れる方向と平行であることから、電磁鋼板２３の磁気特性を向上できる。   When friction stir welding is performed in this way, when the stator core 20 returns to room temperature, the shrinkage of the stator core 20 is hindered by the metal case 40 through the joint portion 60, and internal stress remains in the stator core 20. FIG. 4 is an explanatory diagram of the residual stress of the stator core 20. The stator core 20 is subjected to a radially outward stress at the joint 60 as indicated by an arrow d1, and a stress that expands the diameter of the stator core 20 is always applied. As a result, the tensile stress in the circumferential direction acts on the yoke portion 22 as indicated by the arrow d2, and the direction of this force is parallel to the direction in which the magnetic flux flows, so that the magnetic properties of the electromagnetic steel sheet 23 can be improved.

係る構成からなる回転電機Ａでは、ステータコア２０と金属ケース４０とを接合するにあたり、接合部６０において電磁鋼板の磁気特性を大きく悪化させることなく、ステータコア２０と金属ケース４０との間の熱伝導性を向上することができる。つまり、摩擦攪拌接合は金属ケース４０を塑性流動させて練り混ぜ、その際、ステータコア２０を構成する電磁鋼板２３の表面に存在する酸化層が除去され、接合に有利な表面を露出させて両部材間を接合するので、溶接の場合のように電磁鋼板をその径方向深くまで溶融することがなく、したがって、接合部６０において電磁鋼板２３の磁気特性を大きく悪化させることがない。また、ステータコア２０と金属ケース４０の各部材が冶金的に接合されているので、これらが単に機械的に接触している場合よりも熱伝導性を向上でき、ひいて回転電機Ａの冷却性能を向上できる。ステータコア２０と金属ケース４０との接合は、摩擦攪拌接合による接合のみが望ましいが、他の接合方式との併用であってもよい。   In the rotating electrical machine A having such a configuration, when the stator core 20 and the metal case 40 are joined, the thermal conductivity between the stator core 20 and the metal case 40 is not greatly deteriorated in the joining portion 60 without greatly deteriorating the magnetic properties of the electromagnetic steel sheet. Can be improved. That is, in the friction stir welding, the metal case 40 is plastically flowed and kneaded, and at that time, the oxide layer present on the surface of the electromagnetic steel plate 23 constituting the stator core 20 is removed, and the surface advantageous for joining is exposed to expose both members. Since the gaps are joined, the electromagnetic steel sheet is not melted deeply in the radial direction as in the case of welding, and therefore the magnetic properties of the electromagnetic steel sheet 23 are not greatly deteriorated at the joint 60. Further, since each member of the stator core 20 and the metal case 40 is metallurgically joined, the thermal conductivity can be improved as compared with the case where they are merely mechanically contacted, and the cooling performance of the rotating electrical machine A is improved. It can be improved. The stator core 20 and the metal case 40 are preferably joined only by friction stir welding, but may be used in combination with other joining methods.

また、溝４１及び４２を形成したので、金属ケース４０の放熱性が向上でき、回転電機Ａの冷却性能を更に向上できる。また、相対的に薄肉となる溝４１の底部４１ａを接合部６０とすることで、摩擦攪拌接合を、より容易にかつ確実に行うことができ、加えて、金属ケース４０全体が薄肉とならずに、厚肉の部位が存することで、その剛性の確保が要求される場合に好適である。   Moreover, since the grooves 41 and 42 are formed, the heat dissipation of the metal case 40 can be improved, and the cooling performance of the rotating electrical machine A can be further improved. Further, by using the bottom portion 41a of the relatively thin groove 41 as the joint portion 60, the friction stir welding can be performed more easily and reliably, and in addition, the entire metal case 40 does not become thin. In addition, the presence of a thick portion is suitable when it is required to ensure its rigidity.

更に、軸方向と平行な方向の溝４１の底部４１ａに接合部６０を形成したことで、積層された複数の電磁鋼板２３のうちの多数を金属ケース４０と接合することができ、特に、図４に示したように引張応力を残留させる構成の場合に有利である。なお、本実施形態では接合部６０をティース部２１に対応するヨーク部２２の外周面部に設けているが、各ティース部２１間のヨーク部２２の外周面部に設けてもよい。   Furthermore, by forming the joint portion 60 at the bottom 41a of the groove 41 in a direction parallel to the axial direction, a large number of the laminated plurality of electromagnetic steel plates 23 can be joined to the metal case 40. This is advantageous in the case of a configuration in which a tensile stress remains as shown in FIG. In addition, in this embodiment, although the junction part 60 is provided in the outer peripheral surface part of the yoke part 22 corresponding to the teeth part 21, you may provide in the outer peripheral surface part of the yoke part 22 between each teeth part 21. FIG.

また、通路形成部材５０を設けて冷却水通路を形成したことで、回転電機Ａを水冷で冷却できる。尤も、通路形成部材５０を設けずに、空冷としてもよく、更に、冷却性能が大きく要求されない場合には溝４１、４２を設けない構成も採用可能である。   Moreover, the rotary electric machine A can be cooled by water cooling by providing the passage forming member 50 and forming the cooling water passage. However, air cooling may be performed without providing the passage forming member 50, and a configuration in which the grooves 41 and 42 are not provided when cooling performance is not required greatly can be employed.

なお、本実施形態では、溝４１、４２によって金属ケース４０の外周面に、全体としてジグザグ状の溝を形成したが、溝の形状はこれに限られず、種々の形状のものを採用でき、例えば、螺旋状に形成してもよい。図５は、金属ケース４０に代わる金属ケース４０'の外周面の展開図であり、螺旋状の溝４３を形成したものである。ここで、図面上の端部４３ａ、４３ａ及び端部４３ｂ、４３ｂは実際には連続しており、溝４３は一本の溝である。また、破線で囲む部分は接合部６０となる部分の例を示し、同図の例では、溝４３の底部において、溝４３に沿って螺旋状に接合部６０を形成している。   In the present embodiment, the zigzag groove as a whole is formed on the outer peripheral surface of the metal case 40 by the grooves 41 and 42. However, the shape of the groove is not limited to this, and various shapes can be adopted. Alternatively, it may be formed in a spiral shape. FIG. 5 is a developed view of the outer peripheral surface of a metal case 40 ′ instead of the metal case 40, in which a spiral groove 43 is formed. Here, the end portions 43a and 43a and the end portions 43b and 43b in the drawing are actually continuous, and the groove 43 is a single groove. A portion surrounded by a broken line shows an example of a portion that becomes the joint portion 60. In the example of the figure, the joint portion 60 is spirally formed along the groove 43 at the bottom of the groove 43.

Ａ 回転電機
１０ ロータ
２０ ステータコア
２３ 電磁鋼板
４０、４０’ 金属ケース
６０ 接合部 A Rotating electrical machine 10 Rotor 20 Stator core 23 Electrical steel sheet 40, 40 'Metal case 60 Joint

Claims (4)

ロータの軸方向に積層された複数の電磁鋼板を備えたステータコアと、
前記ステータコアが挿入される筒状の金属ケースと、を備えた回転電機において、
前記ステータコアと前記金属ケースとを摩擦攪拌接合した接合部を備えたことを特徴とする回転電機。 A stator core comprising a plurality of electromagnetic steel sheets laminated in the axial direction of the rotor;
In a rotating electrical machine comprising a cylindrical metal case into which the stator core is inserted,
A rotating electrical machine comprising a joint portion obtained by friction stir welding the stator core and the metal case. 前記金属ケースが、
その外周面に、深さ方向が前記ロータの径方向である溝を備え、
前記接合部が前記溝の底部と前記ステータコアとを接合していることを特徴とする請求項１に記載の回転電機。 The metal case is
The outer peripheral surface is provided with a groove whose depth direction is the radial direction of the rotor,
The rotating electrical machine according to claim 1, wherein the joint portion joins the bottom portion of the groove and the stator core. 前記溝を液密に覆い、冷却水通路を形成する通路形成部材を備えたことを特徴とする請求項２に記載の回転電機。   The rotating electrical machine according to claim 2, further comprising a passage forming member that liquid-tightly covers the groove and forms a cooling water passage. 前記金属ケースの内径は、前記ステータコアが遊嵌される大きさを有し、
前記摩擦攪拌接合は、前記ステータコアが加熱されてその外周面が前記金属ケースの内周面に接触した状態で行われたものであることを特徴とする請求項１乃至３のいずれか１項に記載の回転電機。 The inner diameter of the metal case has a size in which the stator core is loosely fitted,
The friction stir welding is performed in a state where the stator core is heated and an outer peripheral surface thereof is in contact with an inner peripheral surface of the metal case. The rotating electrical machine described.
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