JP2010178589A - Rotating electrical machine - Google Patents

Rotating electrical machine Download PDF

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JP2010178589A
JP2010178589A JP2009021550A JP2009021550A JP2010178589A JP 2010178589 A JP2010178589 A JP 2010178589A JP 2009021550 A JP2009021550 A JP 2009021550A JP 2009021550 A JP2009021550 A JP 2009021550A JP 2010178589 A JP2010178589 A JP 2010178589A
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stator core
case member
press
electrical machine
rotating electrical
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JP5282592B2 (en
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Hisayuki Momijishima
寿行 椛嶌
Nobuo Sakate
宣夫 坂手
Yukihiro Sugimoto
幸弘 杉本
Toshiyuki Gendo
俊行 玄道
Tatsuto Fukushima
立人 福島
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Mazda Motor Corp
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Mazda Motor Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

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  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotating electric machine capable of effectively improving energy efficiency thereof, by making a uniform tensile strength act on a stator core. <P>SOLUTION: The rotating electric machine has an annular stator core 2, formed by laminating a plurality of electromagnetic steel plates 15 in a rotor shaft direction, and a case member 1 for holding the stator core 2. The rotating electric machine includes a fixing portion for fixing at least part of the outer circumferential portion of the stator core 2 to the case member; protruding portions 4, 4 for allowing at least part of the case member 1 to protrude from a rotor shaft direction end surface of the stator core 2; and a press-inserting member 5 to be press-inserted from the inside of a radial direction of the stator core 2 for the protruding portions 4, 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、ロータ軸方向に複数枚の電磁鋼板が積層されてなるステータコアを備えた電動機または発電機からなる回転電機に関するものである。   The present invention relates to a rotating electrical machine including an electric motor or a generator provided with a stator core in which a plurality of electromagnetic steel plates are laminated in the rotor axial direction.

上記電動機または発電機からなる回転電機は、電気エネルギーを回転力に変換し、あるいは回転力を電気エネルギーに変換するものであって、その変換効率を効果的に向上させることにより、省エネルギーに寄与することが望まれている。例えば、電動機を駆動源とする電気自動車や、エンジンと電動機とを組み合わせて駆動力を得るハイブリッド自動車では、その軽負荷領域から高負荷領域に至る幅広い負荷領域で、電気エネルギーと回転力との変換効率を向上させることにより電気エネルギーや燃料の消費を抑制することが求められている。   The rotating electrical machine composed of the electric motor or the generator converts electrical energy into rotational force, or converts rotational force into electrical energy, and contributes to energy saving by effectively improving the conversion efficiency. It is hoped that. For example, in an electric vehicle using an electric motor as a drive source or a hybrid vehicle that obtains driving force by combining an engine and an electric motor, conversion of electric energy and rotational force in a wide load region from light load region to high load region There is a need to reduce the consumption of electrical energy and fuel by improving efficiency.

上記回転電機の性能を向上させることを目的として、一方向の磁化容易軸を有する一方向性電磁鋼板、互いに直交する二方向の磁化容易軸を有する二方向性電磁鋼板、または磁化容易軸が特定の方向性を有していない無方向性電磁鋼板の何れかを所定形状に打ち抜き成形し、この打ち抜いた複数枚の電磁鋼板を積層して一体化させることにより回転電機のステータコアを形成することが行われている。例えば、特定の方向に優れた磁気特性を有する一方向性電磁鋼板により上記ステータコアを形成する場合において、ステータコアの径方向に優れた磁気特性が発揮されるように形成されたティース部材と、ステータコアの周方向に優れた磁気特性が発揮される形成されたヨーク部材とを組み合わせるようにすれば、理論的にはステータコアの鉄損を効果的に低減することが可能である。   For the purpose of improving the performance of the rotating electrical machine, a unidirectional electrical steel sheet having an easy magnetization axis in one direction, a bidirectional electrical steel sheet having easy magnetization axes in two directions orthogonal to each other, or an easy magnetization axis is specified. Forming a stator core of a rotating electrical machine by stamping and forming any of the non-oriented electrical steel sheets that do not have the directionality to a predetermined shape, and stacking and integrating the plurality of punched electrical steel sheets Has been done. For example, when the stator core is formed of a unidirectional electrical steel sheet having excellent magnetic properties in a specific direction, a tooth member formed so as to exhibit excellent magnetic properties in the radial direction of the stator core, Theoretically, the iron loss of the stator core can be effectively reduced by combining with the formed yoke member that exhibits excellent magnetic properties in the circumferential direction.

しかし、一方向性電磁鋼板により形成されたステータコアのティース部材とヨーク部材との当接部に、磁気抵抗の大きいエアギャップが生じることが避けられず、この部分において磁気の流れが阻害されるという問題がある。また、上記一方向性電磁鋼板または二方向性電磁鋼板は、無方向性電磁鋼板に比べて高価であるため、上記ステータコアを無方向性電磁鋼板により形成するとともに、その鉄損低減を目的としてステータコアのヨーク部に円周方向の引張応力を付加することが提案されている。   However, it is inevitable that an air gap with a large magnetic resistance is generated at the contact portion between the teeth member and the yoke member of the stator core formed of the unidirectional electrical steel sheet, and the magnetic flow is inhibited in this portion. There's a problem. In addition, since the unidirectional electrical steel sheet or the bi-directional electrical steel sheet is more expensive than the non-oriented electrical steel sheet, the stator core is formed of the non-oriented electrical steel sheet and the stator core is used for the purpose of reducing the iron loss. It has been proposed to apply a circumferential tensile stress to the yoke portion.

例えば、下記特許文献１には、モータケースとステータコア（固定子）とを有するインナーロータ型のモータにおいて、上記モータケースおよびステータコアに熱膨張差を生じさせた状態で両者を固定し、あるいはステータコアの内周面に保持部材を当接させて外方側に押圧力を作用させることによりステータコアに引張応力を付与し、これによってある程度の鉄損低減効果が得られるようにした構成が示唆されている。   For example, in Patent Document 1 below, in an inner rotor type motor having a motor case and a stator core (stator), both of the motor case and the stator core are fixed in a state in which a difference in thermal expansion occurs, or the stator core A structure is suggested in which a tensile stress is applied to the stator core by bringing a holding member into contact with the inner peripheral surface and applying a pressing force to the outer side, thereby obtaining a certain degree of iron loss reduction effect. .

特開２００６−２２３０１５号公報JP 2006-223015 A

上記特許文献１に開示された第１実施形態では、モータケースの内径をステータコアの外周よりもやや大きめとなるように作製し、ステータコアを加熱して膨張させ、あるいはモータケースを冷却して収縮させることにより、両者の直径および嵌合部が適正に嵌め合う寸法となった時点でステータコアをモータケースに挿入して両者を固定した後、常温に戻すことにより上記ステータコアのヨーク部（継鉄部）に径方向の引張応力を作用させるように構成している。   In the first embodiment disclosed in Patent Document 1, the inner diameter of the motor case is made to be slightly larger than the outer periphery of the stator core, and the stator core is heated to expand, or the motor case is cooled to contract. As a result, when the diameters and the fitting parts of both of them are properly fitted, the stator core is inserted into the motor case and fixed, and then returned to room temperature to return the yoke part (relay part) of the stator core. It is comprised so that the tensile stress of radial direction may act on this.

しかし、上記特許文献１の第１実施形態に示すように、モータケースの内周部およびステータコアの外周部に相対応して設けられたテーパ状の嵌合部を、それぞれ適正状態で嵌め合わせるとともに、上記ステータコアのヨーク部に所定の引張応力を作用させ得るように、上記ステータコアまたはモータケースの寸法および温度を管理するように構成した場合には、これらの寸法および温度の両方を適正に管理することが極めて困難であり、実用的でないという問題がある。   However, as shown in the first embodiment of Patent Document 1, the tapered fitting portions provided corresponding to the inner peripheral portion of the motor case and the outer peripheral portion of the stator core are fitted in an appropriate state, respectively. In the case where the size and temperature of the stator core or the motor case are controlled so that a predetermined tensile stress can be applied to the yoke portion of the stator core, both the size and the temperature are appropriately managed. This is extremely difficult and impractical.

また、上記特許文献１の第２実施形態には、モータケースの底部と一体となった複数個の保持部材をスロット内部からステータコアにそれぞれ接触させ、ステータコア外方側へ押圧してそのヨーク部に引張応力を作用させることにより、ステータコアの保持と磁気特性の改善とを同時に達成可能とした構成が開示されている。さらに、上記保持部材の強度を高めるためには、モータケースの上面部取付ボルトで上記保持部材を上面側から固定することが好ましいと、上記特許文献１に記載されている。   Further, in the second embodiment of Patent Document 1, a plurality of holding members integrated with the bottom of the motor case are brought into contact with the stator core from the inside of the slot and pressed outwardly of the stator core to the yoke portion. A configuration is disclosed in which the holding of the stator core and the improvement of the magnetic properties can be achieved simultaneously by applying a tensile stress. Furthermore, Patent Document 1 describes that in order to increase the strength of the holding member, it is preferable to fix the holding member from the upper surface side with an upper surface portion mounting bolt of the motor case.

しかし、上記特許文献１の図５および図６に開示されているように、ステータコアに設けられた複数のスロット毎に保持部材を配設してこれをボルトで固定した場合には、ロータ軸の中心からボルト孔位置までの寸法誤差に起因して上記保持部材からステータコアに付与される押圧力にバラツキが生じ易く、結果としてステータコアの周方向に不均一な引張応力が付与されることが避けられない。さらに、上記各保持部材は、モータケースの上面部側からのみ取付ボルトで固定されているので、上記ロータ軸方向に積層された各電磁鋼板のそれぞれに均一な引張応力を付与することができないという問題があった。   However, as disclosed in FIG. 5 and FIG. 6 of the above-mentioned Patent Document 1, when a holding member is arranged for each of a plurality of slots provided in the stator core and fixed with bolts, the rotor shaft Due to the dimensional error from the center to the bolt hole position, the pressing force applied from the holding member to the stator core is likely to vary, and as a result, it is possible to avoid applying an uneven tensile stress in the circumferential direction of the stator core. Absent. Furthermore, since each said holding member is being fixed only with the attachment volt | bolt only from the upper surface part side of the motor case, it cannot be given uniform tensile stress to each of each electromagnetic steel plate laminated | stacked on the said rotor axial direction. There was a problem.

本発明は、上記の問題点に鑑みてなされたものであり、ステータコアに均一な引張応力を作用させることにより、その鉄損の低減効果および磁束密度の増大効果を向上させることができる回転電機を提供することを目的としている。   The present invention has been made in view of the above problems, and a rotating electric machine that can improve the effect of reducing the iron loss and the effect of increasing the magnetic flux density by applying a uniform tensile stress to the stator core. It is intended to provide.

請求項１に係る発明は、複数枚の電磁鋼板をロータ軸方向に積層されることにより形成された円環状のステータコアと、このステータコアを保持するケース部材とを有する回転電機であって、上記ステータコアの外周部の少なくとも一部をケース部材に固定した固定部と、ケース部材の少なくとも一部を上記ステータコアのロータ軸方向端面よりも突出させた突出部と、この突出部に対して径方向内方側から圧挿される圧挿部材とを備えたものである。   The invention according to claim 1 is a rotating electrical machine having an annular stator core formed by laminating a plurality of electromagnetic steel plates in the rotor axial direction, and a case member for holding the stator core, the stator core A fixed part in which at least a part of the outer peripheral part of the stator member is fixed to the case member, a protruding part in which at least a part of the case member protrudes from the end surface in the rotor axial direction of the stator core, and a radially inward direction relative to the protruding part A press-fitting member that is press-fitted from the side.

請求項２に係る発明は、上記請求項１に記載の回転電機において、上記ステータコアの外周部には、ロータの軸方向に延びる溝部が設けられ、この溝部の幅寸法は、ステータコアの外周側よりも内周側の方が大きく形成されるとともに、この溝部と、この溝部内に侵入させた上記ケース部材の一部とにより上記固定部が形成されたものである。   According to a second aspect of the present invention, in the rotating electrical machine according to the first aspect, a groove portion extending in the axial direction of the rotor is provided in the outer peripheral portion of the stator core, and the width dimension of the groove portion is determined from the outer peripheral side of the stator core. Further, the inner peripheral side is formed larger, and the fixing portion is formed by the groove portion and a part of the case member that has entered the groove portion.

請求項３に係る発明は、上記請求項２に記載の回転電機において、上記ケース部材の外周面部を摩擦撹拌して上記溝部内に侵入させることにより上記固定部が形成されたものである。   According to a third aspect of the present invention, in the rotating electric machine according to the second aspect, the fixed portion is formed by frictionally stirring the outer peripheral surface portion of the case member and entering the groove portion.

請求項４に係る発明は、上記請求項１〜３のいずれか１項に記載の回転電機において、上記圧挿部材は、ロータ軸の挿通孔が形成された円形基板と、その外周部から上記突出部内周面に沿ってロータ軸方向に延びるフランジ部とを備えるとともに、このフランジ部が上記ケース部材の突出部に対して径方向内方側から圧挿されるように構成されたものである。   According to a fourth aspect of the present invention, in the rotating electrical machine according to any one of the first to third aspects, the press-fitting member includes a circular substrate having a rotor shaft insertion hole and an outer peripheral portion thereof. And a flange portion extending in the rotor axial direction along the inner peripheral surface of the protruding portion, and the flange portion is configured to be press-fitted from the radially inner side with respect to the protruding portion of the case member.

請求項５に係る発明は、上記請求項１〜４のいずれか１項に記載の回転電機において、上記圧挿部材には、ステータコアのヨーク部のロータ軸方向端面に当接する補助コアが設けられたものである。   According to a fifth aspect of the present invention, in the rotating electrical machine according to any one of the first to fourth aspects, the press-inserting member is provided with an auxiliary core that contacts the end surface in the rotor axial direction of the yoke portion of the stator core. It is a thing.

請求項６に係る発明は、上記請求項１〜５のいずれか１項に記載の回転電機において、上記圧挿部材は、ステータコアのロータ軸方向端面を覆う蓋部材の一部として一体的に設けられたものである。   According to a sixth aspect of the present invention, in the rotating electrical machine according to any one of the first to fifth aspects, the press-fitting member is integrally provided as a part of a lid member that covers a rotor axial end surface of the stator core. It is what was done.

請求項１に係る発明では、上記ステータコアの外周部の少なくとも一部をケース部材に固定した状態で、ケース部材の少なくとも一部を上記ステータコアのロータ軸方向端面よりも突出させた突出部に対して圧挿部材を径方向内方側から圧挿するように構成したため、この圧挿部材から上記ケース部材を介してステータコアのヨーク部に周方向へと向かう均一な引張応力を作用させることにより、優れた鉄損の低減効果および磁束密度の増大効果が得られるという利点がある。   In the invention which concerns on Claim 1, in the state which fixed at least one part of the outer peripheral part of the said stator core to the case member, with respect to the protrusion part which protruded at least one part of the case member rather than the rotor axial direction end surface of the said stator core Since the press-insertion member is configured to be press-inserted from the radially inward side, it is excellent by applying a uniform tensile stress from the press-insert member to the yoke portion of the stator core in the circumferential direction via the case member. Further, there is an advantage that an effect of reducing the iron loss and an effect of increasing the magnetic flux density can be obtained.

請求項２に係る発明では、ロータの軸方向に延びる溝部をステータコアの外周部に設け、この溝部における内周側の幅寸法をステータコアの外周側よりも大きく形成したため、上記溝部内にケース部材の一部を侵入させることにより、このケー部材と上記ステータコアとを強固に一体化できるという利点がある。   In the invention according to claim 2, since the groove portion extending in the axial direction of the rotor is provided in the outer peripheral portion of the stator core, and the width of the inner peripheral side of the groove portion is formed larger than that of the outer peripheral side of the stator core, the case member is formed in the groove portion. There is an advantage that the case member and the stator core can be firmly integrated by invading a part thereof.

請求項３に係る発明では、上記ケース部材の外周面部を摩擦撹拌して上記溝部内に侵入させることにより上記固定部を形成したため、焼き嵌めまたは冷やし嵌め等の手段で上記ケー部材とステータコアとを一体化するように構成した場合のように、ステータコアがその外周面全体に発生する圧縮応力の影響を受けて上記鉄損の低減効果および磁束密度の増大効果が損なわれるのを効果的に防止することができる。   In the invention according to claim 3, since the fixed portion is formed by frictionally stirring the outer peripheral surface portion of the case member and entering the groove portion, the case member and the stator core are connected by means such as shrink fitting or cold fitting. As in the case of being configured to be integrated, the stator core is effectively prevented from being damaged by the effect of compressive stress generated on the entire outer peripheral surface thereof to reduce the iron loss reducing effect and the magnetic flux density increasing effect. be able to.

請求項４に係る発明では、上記圧挿部材を、ロータ軸の挿通孔が形成された円形基板と、その外周部から上記ケース部材の突出部内周面に沿ってロータ軸方向に延びるフランジ部とにより構成し、このフランジ部を上記ケース部材の突出部に対して径方向内方側から圧挿するように構成したため、旋盤等を使用した切削加工により高い精度で上記フランジ部の外径寸法を設定することができる。したがって、上記ケース部材の突出部に対して径方向内方側から上記圧挿部材のフランジ部を圧接させることにより、ステータコアのヨーク部に周方向へと向かう均一な引張応力を簡単かつ適正に作用させることができる。   In the invention which concerns on Claim 4, the said press-insertion member is a circular board | substrate with which the penetration hole of the rotor shaft was formed, and the flange part extended in a rotor axial direction along the protrusion internal peripheral surface of the said case member from the outer peripheral part. Since this flange portion is configured to be press-fitted from the radially inner side to the protruding portion of the case member, the outer diameter dimension of the flange portion can be increased with high accuracy by cutting using a lathe or the like. Can be set. Therefore, by pressing the flange portion of the press-fitting member from the radially inner side to the protruding portion of the case member, uniform tensile stress in the circumferential direction is easily and appropriately applied to the yoke portion of the stator core. Can be made.

請求項５に係る発明では、ステータコアのロータ回転軸方向両端部に形成されたスペース、つまりステータコアのティース部に巻回されたコイルの高さに対応して形成されたスペースを有効に利用して上記補助コアを配設し、これによって回転電機に所望のトルクを生じさせるための磁束を流すのに必要なバックヨーク部の断面積を効果的に増大させることができ、上記バックヨーク部の径方向の厚みを薄くして回転電機の小型化を実現できるという利点がある。   In the invention which concerns on Claim 5, the space formed corresponding to the height of the coil wound around the teeth part of the stator core, ie, the space formed in the rotor rotational axis direction both ends of the stator core, is effectively utilized. By providing the auxiliary core, it is possible to effectively increase the cross-sectional area of the back yoke portion necessary for flowing a magnetic flux for generating a desired torque in the rotating electrical machine. There is an advantage that the size of the rotating electrical machine can be reduced by reducing the thickness in the direction.

請求項６に係る発明では、ケース部材の突出部に対して径方向内方側から圧挿される圧挿部材を、ステータコアのロータ軸方向端面を覆うカバー部材の一部として一体的に設けたため、部品点数を増加させることなく上記ステータコアのヨーク部に周方向へと向かう均一な引張応力を作用させることができるとともに、回転電機の組立作業を効果的に簡略化できるという利点がある。   In the invention according to claim 6, since the press-fitting member that is press-fitted from the radially inner side with respect to the protruding portion of the case member is integrally provided as a part of the cover member that covers the rotor axial end surface of the stator core, There is an advantage that uniform tensile stress in the circumferential direction can be applied to the yoke portion of the stator core without increasing the number of parts, and the assembly work of the rotating electrical machine can be simplified effectively.

本発明に係る回転電機の実施形態を示す断面図である。It is sectional drawing which shows embodiment of the rotary electric machine which concerns on this invention. 上記回転電機を分解した状態を示す断面図である。It is sectional drawing which shows the state which decomposed | disassembled the said rotary electric machine. 図１のＩＩＩ−ＩＩＩ線断面図である。It is the III-III sectional view taken on the line of FIG. ステータコアの具体的構成を示す斜視図である。It is a perspective view which shows the specific structure of a stator core. 圧挿部材の具体的構成を示す平面図である。It is a top view which shows the specific structure of a press-insertion member. 図１のＶＩ−ＶＩ線断面図である。It is the VI-VI sectional view taken on the line of FIG. 圧挿部材の変形例を示す図２相当図である。FIG. 3 is a view corresponding to FIG. 2 showing a modification of the press-fitting member. 本発明に係る回転電機の別の実施形態を示す図２相当図である。FIG. 3 is a view corresponding to FIG. 2 showing another embodiment of the rotating electrical machine according to the present invention. 本発明に係る回転電機のさらに別の実施形態を示す図１相当図である。FIG. 3 is a view corresponding to FIG. 1 showing still another embodiment of the rotating electrical machine according to the present invention. 本発明に係る回転電機のさらに別の実施形態を示す図３相当図である。FIG. 6 is a view corresponding to FIG. 3 showing still another embodiment of the rotating electrical machine according to the present invention.

図１〜図４は、本発明に係る回転電機の実施形態を示している。この回転電機は、アルミニウム合金材またはオーステナイト系ＳＵＳ材等の非磁性体からなる円筒状のケース部材１と、このケース部材１に保持されたステータコア（固定子）２と、上記ケース部材１のロータ回転軸方向の両端部に設けられた図外のカバー部材に固定されたベアリングにより回転自在に支持されたロータ（回転子）３とを備えている。   1 to 4 show an embodiment of a rotating electrical machine according to the present invention. The rotating electrical machine includes a cylindrical case member 1 made of a nonmagnetic material such as an aluminum alloy material or an austenitic SUS material, a stator core (stator) 2 held by the case member 1, and a rotor of the case member 1. And a rotor (rotor) 3 rotatably supported by bearings fixed to cover members (not shown) provided at both ends of the rotation axis direction.

上記ケース部材１は、その内径がステータコア２の外径と略等しい値に設定されることにより、上記ケース部材１内にステータコア２を挿入し得るように構成されている。また、上記ケース部材１は、その軸方向寸法がステータコア２よりも長く設定されることにより、その一部がステータコア２のロータ軸方向端面よりも突出した状態で設置され、かつ上記ケース部材１内には、その突出部４，４に対してステータコア２の径方向内方側から一対の圧挿部材５，５が圧挿されるように構成されている。   The case member 1 is configured such that the stator core 2 can be inserted into the case member 1 by setting the inner diameter thereof to a value substantially equal to the outer diameter of the stator core 2. Further, the case member 1 is set so that its axial dimension is longer than that of the stator core 2, so that a part of the case member 1 protrudes from the end surface in the rotor axial direction of the stator core 2. Is configured such that a pair of press-fitting members 5 and 5 are press-fitted into the protrusions 4 and 4 from the radially inner side of the stator core 2.

上記ステータコア２は、円環状に形成されたヨーク部（胴部）６と、その内周面から回転中心に向けて突出する複数個のティース部（歯部）７とを有し、このティース部７にコイル（電機子巻線）８が巻掛けられるように構成されている。また、上記ヨーク部６の外周部には、ロータ３の軸方向に延びる複数個の溝部９がロータの周方向に一定間隔で配設されている。上記溝部９は、その幅寸法がステータコア２の外周側よりも内周側の方が大きくなった所謂蟻溝状に形成されている。当実施形態では、ステータコア２の内周部に６個のティース部７が突設されるとともに、このティース部７の設置位置に対応するステータ２の外周部に上記溝部９がそれぞれ設けられている。そして、後述するように上記ケース部材１が摩擦撹拌されることにより、上記ケース部材１の壁面部を上記溝部９内に侵入させた固定部が形成されるようになっている。   The stator core 2 has a yoke portion (body portion) 6 formed in an annular shape, and a plurality of teeth portions (tooth portions) 7 projecting from the inner peripheral surface thereof toward the center of rotation. A coil (armature winding) 8 is wound around 7. A plurality of grooves 9 extending in the axial direction of the rotor 3 are arranged on the outer peripheral portion of the yoke portion 6 at regular intervals in the circumferential direction of the rotor. The groove portion 9 is formed in a so-called dovetail shape whose width is larger on the inner peripheral side than on the outer peripheral side of the stator core 2. In the present embodiment, six tooth portions 7 project from the inner peripheral portion of the stator core 2, and the groove portions 9 are provided in the outer peripheral portion of the stator 2 corresponding to the installation position of the tooth portions 7. . Then, as will be described later, the case member 1 is friction-stirred to form a fixed portion in which the wall surface portion of the case member 1 is inserted into the groove portion 9.

上記圧挿部材５は、図２および図５に示すように、所定の剛性を有するアルミニウム合金材を削り加工する等により形成された円形基板１０と、その外周部から円形基板１０の厚さ方向に突設されたフランジ部１１とからなり、円形基板１０の中心部にはロータ軸１２，１３の挿通孔１４が形成されている。また、上記フランジ部１１の外径Ｄは、ステータコア２の端面から突出したケース部材１の突出部４の内径ｄよりも、１００μｍ〜３００μｍ程度大きく設定されている。これにより、後述するように上記圧挿部材５をケース部材１のロータ軸方向両端部に組み付ける際に、その突出部４，４に対してステータコア２の径方向内方側から上記圧挿部材５のフランジ部１１が圧挿されるように構成されている。   As shown in FIGS. 2 and 5, the press-fitting member 5 includes a circular substrate 10 formed by cutting an aluminum alloy material having a predetermined rigidity, and the thickness direction of the circular substrate 10 from the outer periphery. An insertion hole 14 for the rotor shafts 12 and 13 is formed at the center of the circular substrate 10. The outer diameter D of the flange portion 11 is set to be about 100 μm to 300 μm larger than the inner diameter d of the protruding portion 4 of the case member 1 protruding from the end face of the stator core 2. Thus, as will be described later, when the press-inserting member 5 is assembled to both ends of the case member 1 in the rotor axial direction, the press-inserting member 5 from the radially inner side of the stator core 2 with respect to the protrusions 4, 4. The flange portion 11 is configured to be press-fitted.

上記ステータコア２を作製するには、まず０．１〜１．０ｍｍ程度の厚さを有する磁性鋼板を打ち抜くことにより、上記ティース部７を構成する複数の突部が内周面に設けられるとともに、外周面に上記溝部９が設けられた円環状板からなる複数枚の電磁鋼板１５を形成する。次いで、上記ティース部７および溝部９の位置を一致させるように各電磁鋼板１５を位置決めしつつ、電磁鋼板１５を一枚積層する毎に、この積層した電磁鋼板１５の表面所定位置にその裏面に向かって微小凸部が突出するような微小凹部を設けることで、各電磁鋼板１５をカシメ処理して仮接合するとともに、その外周面部を溶接する等により、複数枚の電磁鋼板１５がロータ回転軸方向に積層されて一体化されたステータコア２を作製する。   In order to produce the stator core 2, first, a plurality of protrusions constituting the teeth portion 7 are provided on the inner peripheral surface by punching out a magnetic steel plate having a thickness of about 0.1 to 1.0 mm. A plurality of electromagnetic steel plates 15 made of an annular plate provided with the groove 9 on the outer peripheral surface are formed. Next, each time the magnetic steel sheets 15 are laminated while positioning the magnetic steel sheets 15 so that the positions of the teeth 7 and the grooves 9 are matched, the surface of the laminated electromagnetic steel sheets 15 is placed on the back surface at a predetermined position. By providing the minute recesses such that the minute projections protrude toward the surface, each of the electromagnetic steel plates 15 is caulked and temporarily joined, and the outer peripheral surface portions thereof are welded. The stator core 2 laminated in the direction and integrated is produced.

そして、上記ステータコア２のティース部７にコイル８を巻掛けるとともに、上記ケース部材１内にステータコア２を挿入し、ケース部材１の軸方向中央部にステータコア２を配設するように位置決めした状態で、図２に示すように、回転ツール１６を用いた摩擦撹拌により、上記ケース部材１の壁面部を上記溝部９内に侵入させてステータコア２の外周部をケース部材１に固定する。すなわち、先端部に円柱状の突部１６ａを有する回転ツール１６を、電動モータ等からなる図外の駆動源により回転駆動しつつ、上記溝部９の設置部に対応したケース部材１の外周面部の部位に、上記回転ツール１６の突部１６ａを押し当てることにより、ケース部材１の壁面部を摩擦熱で塑性流動させて上記溝部９内に侵入させる。ここで、塑性流動とは、ケース部材１をその融点よりも低い温度で軟化させることを意味している。   The coil 8 is wound around the tooth portion 7 of the stator core 2, the stator core 2 is inserted into the case member 1, and the stator core 2 is positioned so as to be disposed at the axial center portion of the case member 1. As shown in FIG. 2, the wall surface of the case member 1 enters the groove 9 by frictional stirring using the rotary tool 16, and the outer peripheral portion of the stator core 2 is fixed to the case member 1. That is, while rotating the rotary tool 16 having a cylindrical protrusion 16a at the tip by an unillustrated driving source such as an electric motor, the outer peripheral surface portion of the case member 1 corresponding to the installation portion of the groove 9 is provided. By pressing the projecting portion 16a of the rotating tool 16 against the portion, the wall surface portion of the case member 1 is plastically flowed by frictional heat to enter the groove portion 9. Here, the plastic flow means that the case member 1 is softened at a temperature lower than its melting point.

上記回転ツール１６を回転させつつ、図２の矢印に示すように、上記溝部９に沿ってその一端部側から他端部側に一定速度で移動させながらケース部材１を摩擦撹拌することにより、上記溝部９の全長に亘りケース部材１の壁面部を侵入させてステータコア２とケース部材１との固定部を形成する。当該固定部を形成する上記摩擦撹拌操作を、ステータコア２の外周面部に形成された溝部９の個数に対応した回数だけ繰り返すことにより、上記ステータコア２の外周部をその複数個所においてケース部材１に固定する。図３において示すように、溝部９に対応するケース部材１の外周面には、ケース部材１が上記溝部９に侵入した量に応じた窪みが形成される。   While rotating the rotary tool 16, as shown by the arrow in FIG. 2, by frictionally stirring the case member 1 while moving at a constant speed from one end side to the other end side along the groove portion 9, A wall portion of the case member 1 is intruded over the entire length of the groove portion 9 to form a fixed portion between the stator core 2 and the case member 1. The outer periphery of the stator core 2 is fixed to the case member 1 at a plurality of locations by repeating the friction stir operation for forming the fixing portion a number of times corresponding to the number of grooves 9 formed on the outer peripheral surface portion of the stator core 2. To do. As shown in FIG. 3, a recess corresponding to the amount of the case member 1 entering the groove portion 9 is formed on the outer peripheral surface of the case member 1 corresponding to the groove portion 9.

なお、上記回転ツール１６は、例えばＳＫＤ１６等の工具鋼よりなり、突部１６ａの突出量長さが５ｍｍ、直径が５ｍｍの円柱状であり、ケース部材１がアルミニウム合金の場合には回転速度が８００ｒｐｍ、移動速度が２００ｍｍ／ｍｉｎ、押し込み深さが５．５ｍｍ程度の条件で摩擦撹拌が行われることが望ましい。また、上記摩擦撹拌において、押し込み深さや回転速度を変更してケース部材１の材料とステータコア２の材料とがともに塑性流動することで両材料が接合状態となるようにされてもよい。   The rotary tool 16 is made of, for example, tool steel such as SKD16. The protrusion 16a has a columnar shape with a protrusion amount length of 5 mm and a diameter of 5 mm. When the case member 1 is an aluminum alloy, the rotation speed is high. Friction stirring is desirably performed under the conditions of 800 rpm, a moving speed of 200 mm / min, and an indentation depth of about 5.5 mm. Further, in the friction agitation, the indentation depth and the rotation speed may be changed so that the material of the case member 1 and the material of the stator core 2 are plastically flowed together so that both materials are in a joined state.

次いで、上記ステータコア２内にロータ３を配設した状態で、図６に示すように、ステータ２のロータ軸方向の両端部側に上記圧挿部材５をそれぞれ設置し、そのフランジ部１１を上記ケース部材１の突出部４に対してステータコア２の径方向内方側から圧挿する。具体的には、上記ケース部材１を加熱して膨張させ、あるいは上記圧挿部材５を冷却して収縮させることにより、上記フランジ部１１の外径Ｄを、ケース部材１の内径ｄよりも小さくした状態で、上記フランジ部１１をケース部材１の突出部４内に設置する。このようにして上記圧挿部材５をステータコア２に組み付けた状態で常温に戻すことにより、圧挿部材５のフランジ部１１を上記突出部４に対してステータコア２の径方向内方側から圧接させるようにする。   Next, with the rotor 3 disposed in the stator core 2, as shown in FIG. 6, the press-fitting members 5 are respectively installed on both ends of the stator 2 in the rotor axial direction, and the flange portions 11 are connected to the flange portions 11 described above. The case member 1 is press-fitted into the projecting portion 4 from the radially inner side of the stator core 2. Specifically, the outer diameter D of the flange portion 11 is made smaller than the inner diameter d of the case member 1 by heating and expanding the case member 1 or cooling and compressing the press-fitting member 5. In this state, the flange portion 11 is installed in the protruding portion 4 of the case member 1. In this way, the flange portion 11 of the press-inserting member 5 is brought into pressure contact with the protruding portion 4 from the radially inner side of the stator core 2 by returning the press-inserting member 5 to the normal temperature in a state where the press-inserting member 5 is assembled to the stator core 2. Like that.

なお、図７に示すように、上記フランジ部１１をケース部材１の突出部４の内周面に機械的に圧入するように構成してもよく、この場合には、上記フランジ部１６の先端部外面に先窄まりのテーパ面１７を形成しておくと圧入が容易になる。この構成によれば、上記ステータコア２を加熱膨張させ、あるいは上記圧挿部材５を冷却収縮させることなく、フランジ部１１を上記ケース部材１の突出部４に対してステータコア２の径方向内方側から圧挿することが可能である。   As shown in FIG. 7, the flange portion 11 may be mechanically press-fitted into the inner peripheral surface of the protruding portion 4 of the case member 1. In this case, the tip of the flange portion 16 may be configured. If a tapered surface 17 having a tapered shape is formed on the outer surface of the part, press-fitting becomes easy. According to this configuration, the flange portion 11 is radially inward of the stator core 2 with respect to the protruding portion 4 of the case member 1 without heating and expanding the stator core 2 or cooling and shrinking the press-fitting member 5. It is possible to press-fit.

上記のように複数枚の電磁鋼板１５をロータ軸方向に積層されることにより形成された円環状のステータコア２と、このステータコア２を保持するケース部材１とを有する回転電機において、上記ステータコア２の外周部の少なくとも一部をケース部材１に固定した固定部と、ケース部材１の少なくとも一部を上記ステータコア２のロータ軸方向端面よりも突出させた突出部４，４と、この突出部４，４に対してステータコアの径方向内方側から圧挿される圧挿部材５，５とを設けたため、優れたモータ効率を有する回転電機を容易かつ適正に製造することができる。   In a rotating electrical machine having an annular stator core 2 formed by laminating a plurality of electromagnetic steel plates 15 in the rotor axial direction and a case member 1 that holds the stator core 2 as described above, A fixed part in which at least a part of the outer peripheral part is fixed to the case member 1, a protruding part 4, 4 in which at least a part of the case member 1 protrudes from the end surface in the rotor axial direction of the stator core 2, 4 is provided with press-fitting members 5 and 5 that are press-fitted from the radially inner side of the stator core. Therefore, a rotating electrical machine having excellent motor efficiency can be manufactured easily and appropriately.

すなわち、上記実施形態では、ケース部材１の軸方向寸法をステータコア２よりも長く設定し、その一部（突出部４，４）をステータコア２のロータ軸方向両端面よりもそれぞれ突出させるように設置した状態で、回転ツール１６を用いた摩擦撹拌により、上記ケース部材１の壁面部を上記溝部９内に侵入させてステータコア２の外周部をケース部材１に固定したため、図６に示すように、ケース部材１の突出部４，４に対してステータコア２の径方向内方側から圧挿部材５をそれぞれ圧挿することにより上記突出部４介してケース部材１に付与される押圧力Ｐに応じ、図３に示すように、上記ステータコア２には、その直径を増大させる方向に均一な圧力Ｑが付与され、ステータコア３のヨーク部６には、周方向への引張応力が付与されることになる。   That is, in the above-described embodiment, the axial dimension of the case member 1 is set longer than that of the stator core 2, and a part thereof (projecting portions 4, 4) is installed so as to project from both end surfaces in the rotor axial direction of the stator core 2. In this state, the outer wall of the stator core 2 is fixed to the case member 1 by causing the wall surface of the case member 1 to enter the groove 9 by frictional stirring using the rotary tool 16, as shown in FIG. Depending on the pressing force P applied to the case member 1 through the protruding portion 4 by press-fitting the pressing member 5 from the radially inner side of the stator core 2 to the protruding portions 4 and 4 of the case member 1. As shown in FIG. 3, the stator core 2 is given a uniform pressure Q in the direction of increasing its diameter, and the yoke portion 6 of the stator core 3 is given a tensile stress in the circumferential direction. It becomes door.

このようにしてステータコア２のヨーク部６には、上記圧挿部材５からケース部材１を介して間接的に付与される圧力Ｑに対応した周方向への均一な引張応力を作用させることができるため、無方向性電磁鋼板を使用して上記ステータコア２を構成した場合においても、優れた鉄損の低減効果および磁束密度の増大効果が得られるという利点がある。しかも、上記ケース部材１に対する固定部を構成する上記溝部９をステータコア２の外周部に設けたため、上記固定部の存在に起因してステータコア２のヨーク部６に生じる磁束の流れが阻害されるのを効果的に抑制できるという利点がある。   In this way, uniform tensile stress in the circumferential direction corresponding to the pressure Q indirectly applied from the press-fitting member 5 through the case member 1 can be applied to the yoke portion 6 of the stator core 2. Therefore, even when the stator core 2 is configured using a non-oriented electrical steel sheet, there is an advantage that an excellent effect of reducing the iron loss and an effect of increasing the magnetic flux density can be obtained. Moreover, since the groove portion 9 constituting the fixing portion for the case member 1 is provided in the outer peripheral portion of the stator core 2, the flow of magnetic flux generated in the yoke portion 6 of the stator core 2 due to the presence of the fixing portion is hindered. There is an advantage that can be effectively suppressed.

特に、上記実施形態では、ロータの軸方向に延びる溝部９をステータコア２の外周部に設け、この溝部９における内周側の幅寸法をステータコアの外周側よりも大きく形成したため、上記溝部９内にケース部材１の一部を摩擦撹拌等の手段で侵入させることにより、この溝部９内からケース部材１の結合部が離脱するのを確実に防止できるという利点がある。したがって、上記ケース部材１とステータコア２とを、より強固に一体化することができる。   In particular, in the above-described embodiment, the groove portion 9 extending in the axial direction of the rotor is provided in the outer peripheral portion of the stator core 2 and the width of the inner peripheral side of the groove portion 9 is larger than that of the outer peripheral side of the stator core. By allowing a part of the case member 1 to enter by means of friction stirring or the like, there is an advantage that it is possible to reliably prevent the coupling portion of the case member 1 from separating from the inside of the groove portion 9. Therefore, the case member 1 and the stator core 2 can be integrated more firmly.

また、上記実施形態に示すように、円形基板１０の外周部にフランジ部１１を突設することにより上記圧挿部材５を構成した場合には、旋盤等を使用した切削加工により高い精度で上記フランジ部１１の外径寸法を設定することができるため、上記ケース部材１の突出部４，４に対してステータコア２の径方向内方側から上記圧挿部材５のフランジ部１１をそれぞれ圧接させることにより、ステータコア２のヨーク部６にその周方向へ向かう均一な引張応力を簡単かつ適正に作用させることができる。   Moreover, as shown in the said embodiment, when the said press-fitting member 5 is comprised by protrudingly providing the flange part 11 in the outer peripheral part of the circular board | substrate 10, it is highly accurate by the cutting process using a lathe etc. Since the outer diameter dimension of the flange portion 11 can be set, the flange portion 11 of the press-fitting member 5 is pressed against the projecting portions 4 and 4 of the case member 1 from the radially inner side of the stator core 2. Thus, uniform tensile stress in the circumferential direction can be easily and appropriately applied to the yoke portion 6 of the stator core 2.

図８は、本発明に係る回転電機の別の実施形態を示している。この実施形態は、上記圧挿部材５のフランジ部１１に凹溝１８が形成され、この凹溝１８内に配設された補助コア１９がステータコア２のヨーク部６のロータ軸方向端面に当接した状態となるように構成されたものである。上記補助コア１９は、電磁鋼板からなる帯状体がロータ軸の周方向に巻回され、その始端部および終端部がそれぞれ点溶接等で固定される等により、上記電磁鋼板がロータ半径方向に積層された状態で、上記フランジ部１１の凹溝１８内に保持されるよう構成されている。   FIG. 8 shows another embodiment of the rotating electrical machine according to the present invention. In this embodiment, a concave groove 18 is formed in the flange portion 11 of the press-fitting member 5, and the auxiliary core 19 disposed in the concave groove 18 abuts on the rotor axial end surface of the yoke portion 6 of the stator core 2. It is comprised so that it may be in the state. The auxiliary core 19 is formed by laminating the electromagnetic steel plates in the radial direction of the rotor by, for example, winding a belt-shaped body made of electromagnetic steel plates in the circumferential direction of the rotor shaft and fixing the start and end portions by spot welding or the like. In this state, it is configured to be held in the concave groove 18 of the flange portion 11.

上記のようにステータコア２のヨーク部６のロータ軸方向端面に当接する補助コア１９を上記圧挿部材５に設けた構造とした場合には、上記ステータコア２のティース部７にコイル８が巻掛けられることにより、ステータコア２のロータ回転軸方向両端部に形成されたスペースを有効に利用して上記補助コア１９を配設することができる。これによって回転電機に所望のトルクを生じさせるための磁束を流すのに必要なバックヨーク部の断面積を効果的に増大させることができ、当該バックヨーク部の径方向の厚みを薄くして回転電機の小型化を実現できるという利点がある。   When the auxiliary core 19 that contacts the end surface in the rotor axial direction of the yoke portion 6 of the stator core 2 is provided in the press-fitting member 5 as described above, the coil 8 is wound around the tooth portion 7 of the stator core 2. As a result, the auxiliary core 19 can be disposed by effectively utilizing the spaces formed at both ends of the stator core 2 in the rotor rotational axis direction. As a result, it is possible to effectively increase the cross-sectional area of the back yoke portion required to flow a magnetic flux for generating a desired torque in the rotating electrical machine, and to rotate the back yoke portion with a reduced radial thickness. There is an advantage that downsizing of the electric machine can be realized.

また、図９に示すように、ステータコア２のロータ軸方向端面を覆うように設置されるとともに、ロータ軸１２，１３を回転自在に支持するベアリング２０が設けられた蓋部材２１，２２の壁面に、上記圧挿部材として機能する円筒状の突部２３を一体的に設けた構造とし、かつ上記蓋部材２１，２２の壁面に設けられた円筒状の突部２３に形成された凹溝内に、電磁鋼板からなる帯状体がロータ軸の周方向に巻回されてなる補助コア２４を配設した構造ともよい。このようにケース部材１の突出部４，４に対してステータコア２の径方向内方側から圧挿される圧挿部材となる突部２３を、ステータコア２のロータ軸方向端面を覆う蓋部材２１，２２の一部として一体的に設けた構成によれば、部品点数を増加させることなく上記ステータコア２のヨーク部６に均一な引張応力を作用させることができるとともに、回転電機の組立作業を効果的に簡略化できる等の利点がある。   Moreover, as shown in FIG. 9, while being installed so that the rotor axial direction end surface of the stator core 2 may be covered, the wall surface of the cover members 21 and 22 provided with the bearing 20 which supports the rotor shafts 12 and 13 rotatably is provided. In the concave groove formed in the cylindrical projection 23 provided on the wall surface of the lid members 21 and 22, the cylindrical projection 23 functioning as the press-inserting member is integrally provided. A structure in which an auxiliary core 24 formed by winding a belt-like body made of an electromagnetic steel plate in the circumferential direction of the rotor shaft may be used. In this way, the protrusion 23 serving as a press-fitting member that is press-fitted from the radially inner side of the stator core 2 to the protrusions 4 and 4 of the case member 1 is covered with the lid member 21 that covers the rotor axial end surface of the stator core 2. According to the configuration provided integrally as a part of 22, uniform tensile stress can be applied to the yoke portion 6 of the stator core 2 without increasing the number of parts, and the assembly work of the rotating electrical machine can be effectively performed. There are advantages such as simplification.

上記実施形態では、円環状に形成された複数枚の電磁鋼板１５をロータ回転軸方向に積層一体化することにより上記ステータコア２を作製した例について説明したが、図１０に示すように、複数枚の電磁鋼板製の分割ピースをロータ回転軸方向に積層して一体化した所定数のブロック体２５を周方向に併設することにより円環状のステータコア２を作製した構造としてもよい。上記各ブロック体２５の外周面側方部には、それぞれ一対の溝部２６を形成し、この溝部２６にケース部材１の一部を侵入させることによりステータコア２とケース部材１とを一体化するように構成されている。   In the above embodiment, the example in which the stator core 2 is manufactured by stacking and integrating a plurality of electromagnetic steel plates 15 formed in an annular shape in the rotor rotation axis direction has been described. However, as illustrated in FIG. The annular stator core 2 may be produced by arranging a predetermined number of block bodies 25 in which the divided pieces made of electromagnetic steel sheets are laminated and integrated in the rotor rotation axis direction in the circumferential direction. A pair of groove portions 26 are formed on the outer peripheral surface side portions of the respective block bodies 25, and the stator core 2 and the case member 1 are integrated by allowing a part of the case member 1 to enter the groove portions 26. It is configured.

そして、上記ステータコア２のロータ軸方向両端面よりも突出させたケース部材１の突出部に対してステータコア２の径方向内方側から圧挿部材５を圧挿して上記ステータコア２の直径を増大させる方向に付勢することにより、ステータコア２のヨーク部６に均一な引張応力を作用させることができる。したがって、無方向性電磁鋼板を使用して上記ステータコア２を構成した場合においても、優れた鉄損の低減効果および磁束密度の増大効果が得られるという利点がある。しかも、上記のように複数枚の分割ピースをロータ回転軸方向に積層して一体化した所定数のブロック体２５を周方向に併設することにより上記円環状のステータコア２を構成した場合には、上記実施形態に示すように円環状に打ち抜いた複数枚の電磁鋼板１５を積層することによりステータコア２を構成する場合に比べて、材料の無駄を抑制して製造コストを低廉化できるという利点がある。   Then, the press-fitting member 5 is press-fitted from the radially inner side of the stator core 2 into the protruding portion of the case member 1 that protrudes from both end surfaces in the rotor axial direction of the stator core 2 to increase the diameter of the stator core 2. By biasing in the direction, a uniform tensile stress can be applied to the yoke portion 6 of the stator core 2. Therefore, even when the stator core 2 is configured using a non-oriented electrical steel sheet, there is an advantage that an excellent effect of reducing the iron loss and an effect of increasing the magnetic flux density can be obtained. Moreover, when the annular stator core 2 is configured by arranging a predetermined number of block bodies 25 that are laminated and integrated in the rotor rotation axis direction as described above in the circumferential direction as described above, Compared to the case where the stator core 2 is configured by laminating a plurality of electromagnetic steel plates 15 punched in an annular shape as shown in the above embodiment, there is an advantage that waste of materials can be suppressed and manufacturing costs can be reduced. .

１ ケース部材
２ ステータコア
３ ロータ
４ 突出部
５ 圧挿部材
６ ヨーク部
９ 溝部
１０ 円形基板
１１ フランジ部
１９ 補助コア
２１，２２ 蓋部材 DESCRIPTION OF SYMBOLS 1 Case member 2 Stator core 3 Rotor 4 Protrusion part 5 Press-insertion member 6 Yoke part 9 Groove part 10 Circular substrate 11 Flange part 19 Auxiliary cores 21 and 22 Cover member

Claims (6)

複数枚の電磁鋼板をロータ軸方向に積層されることにより形成された円環状のステータコアと、このステータコアを保持するケース部材とを有する回転電機であって、上記ステータコアの外周部の少なくとも一部をケース部材に固定した固定部と、ケース部材の少なくとも一部を上記ステータコアのロータ軸方向端面よりも突出させた突出部と、この突出部に対して径方向内方側から圧挿される圧挿部材とを備えたことを特徴とする回転電機。   A rotating electrical machine having an annular stator core formed by laminating a plurality of electromagnetic steel plates in the rotor axial direction and a case member for holding the stator core, wherein at least a part of the outer periphery of the stator core A fixed portion fixed to the case member, a protruding portion in which at least a part of the case member protrudes from the end surface in the rotor axial direction of the stator core, and a press-fitting member that is press-fitted from the radially inner side to the protruding portion. And a rotating electrical machine. 上記ステータコアの外周部には、ロータの軸方向に延びる溝部が設けられ、この溝部の幅寸法は、ステータコアの外周側よりも内周側の方が大きく形成されるとともに、この溝部と、この溝部内に侵入させた上記ケース部材の一部とにより上記固定部が形成されたことを特徴とする請求項１に記載の回転電機。   A groove portion extending in the axial direction of the rotor is provided in the outer peripheral portion of the stator core, and the width dimension of the groove portion is formed larger on the inner peripheral side than on the outer peripheral side of the stator core. The rotating electrical machine according to claim 1, wherein the fixing portion is formed by a part of the case member that has entered the inside. 上記ケース部材の外周面部を摩擦撹拌して上記溝部内に侵入させることにより上記固定部が形成され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, wherein the fixing portion is formed by frictionally stirring the outer peripheral surface portion of the case member to enter the groove portion. 上記圧挿部材は、ロータ軸の挿通孔が形成された円形基板と、その外周部からケース部材の突出部内周面に沿ってロータ軸方向に延びるフランジ部とを備えるとともに、このフランジ部が上記ケース部材の突出部に対して径方向内方側から圧挿されるように構成されたことを特徴とする請求項１〜３のいずれか１項に記載の回転電機。   The press-inserting member includes a circular substrate in which a rotor shaft insertion hole is formed, and a flange portion extending in the rotor axial direction from the outer peripheral portion along the inner peripheral surface of the protruding portion of the case member. The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is configured to be press-fitted from a radially inner side with respect to the protruding portion of the case member. 上記圧挿部材には、ステータコアのヨーク部のロータ軸方向端面に当接する補助コアが設けられたことを特徴とする請求項１〜４のいずれか１項に記載の回転電機。   The rotating electrical machine according to any one of claims 1 to 4, wherein the press-inserting member is provided with an auxiliary core that abuts against a rotor axial end surface of a yoke portion of the stator core. 上記圧挿部材は、ステータコアのロータ軸方向端面を覆う蓋部材の一部として一体的に設けられたことを特徴とする請求項１〜５のいずれか１項に記載の回転電機。   The rotating electrical machine according to any one of claims 1 to 5, wherein the press-inserting member is integrally provided as a part of a lid member that covers an end surface of the stator core in the rotor axial direction.
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