JP4879708B2

JP4879708B2 - Rotating electric machine

Info

Publication number: JP4879708B2
Application number: JP2006302907A
Authority: JP
Inventors: 良浩谷; 正哉井上
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2006-11-08
Filing date: 2006-11-08
Publication date: 2012-02-22
Anticipated expiration: 2026-11-08
Also published as: JP2008125153A

Description

この発明は、車両用交流発電機などの回転電機に関し、特に固定子巻線の冷却性および固定子鉄心の磁気特性を高める固定子構造に関する。 The present invention relates to a rotating electrical machine such as a vehicular AC generator, and more particularly to a stator structure that improves the cooling performance of a stator winding and the magnetic characteristics of a stator core.

車両用交流発電機などの回転電機においては、回転子の界磁鉄心で発生した磁束は、界磁鉄心からエアギャップを介して固定子鉄心のティースに入り、固定子鉄心のコアバックを流れ、ティースからエアギャップを介して界磁鉄心に戻る。この時、固定子巻線に鎖交する磁束の変化に応じた起電力が発生し、整流器を介した直流電流が固定子巻線に流れる。そこで、発電量が多くなると、固定子巻線での発熱量が多くなるので、固定子巻線での発熱を効果的に冷却する必要がある。発電量を多くするには、固定子鉄心での磁気抵抗を小さくし、磁気飽和を抑制する必要がある。 In a rotating electrical machine such as an AC generator for a vehicle, the magnetic flux generated in the field core of the rotor enters the teeth of the stator core through the air gap from the field core, flows through the core back of the stator core, Return from the teeth to the field core through the air gap. At this time, an electromotive force is generated according to a change in magnetic flux interlinked with the stator winding, and a direct current flows through the stator winding through the rectifier. Therefore, when the amount of power generation increases, the amount of heat generated in the stator windings increases, so it is necessary to effectively cool the heat generated in the stator windings. In order to increase the amount of power generation, it is necessary to reduce the magnetic resistance in the stator core and suppress the magnetic saturation.

従来の固定子鉄心は、長尺の鋼板シートを螺旋状に所定回巻回して円筒状に積層する方法（例えば、特許文献１参照）、所定長さの鋼板シートを所定枚積層して直方体の積層体を作製し、その積層体を円環状に曲げ、曲げられた積層体の両端面を突き合わせて接合一体化する方法（例えば、特許文献２参照）などにより作製されていた。
鋼板シートを積層してなる従来の固定子鉄心では、スロット内に収納されている固定子巻線の部位での発熱は、鋼板シートを径方向に流れ、鉄心外周面から放熱される。そこで、鋼板シートの積層方向である軸方向の熱伝達が少ない分、固定子巻線の冷却効率が低下していた。また、磁束は、鋼板シート内のみならず、鋼板シートの積層方向にも流れる。鋼板シートの積層方向の実効比透磁率は、鋼板シートの面内での比透磁率に比較して１桁以上小さい。そこで、従来の固定子鉄心では、積層方向の磁気抵抗が大きくなり、発電効率が低く抑えられていた。 A conventional stator iron core is a method of laminating a long steel sheet sheet in a spiral manner and laminating it into a cylindrical shape (see, for example, Patent Document 1), laminating a predetermined number of steel sheet sheets of a predetermined length, A laminate was produced, and the laminate was bent into an annular shape, and both end surfaces of the bent laminate were brought into contact with each other to be joined and integrated (for example, see Patent Document 2).
In a conventional stator iron core formed by laminating steel sheet, heat generated at a portion of the stator winding housed in the slot flows radially through the steel sheet and is radiated from the outer peripheral surface of the iron core. Therefore, the cooling efficiency of the stator windings has been reduced by the amount of heat transfer in the axial direction, which is the stacking direction of the steel sheet. Further, the magnetic flux flows not only in the steel sheet but also in the stacking direction of the steel sheets. The effective relative permeability in the stacking direction of the steel sheet is one digit or more smaller than the relative permeability in the plane of the steel sheet. Therefore, in the conventional stator core, the magnetic resistance in the stacking direction is increased, and the power generation efficiency is kept low.

このような状況に鑑み、鉄粉などの金属磁性粉末と樹脂との混合物を加圧成型して、固定子巻線のコイルエンドを覆う補助ティース（放熱部材）と、固定子巻線を収納する円筒状の鉄心本体部とを一体に構成して、固定子鉄心の軸方向の熱伝達性を高め、かつ軸方向の磁気抵抗を小さくするようにした第１の従来の固定子が提案されている（例えば、特許文献３参照）。
また、鉄粉などの磁性体の粒子を成型、焼結して作製された磁性体を、固定子巻線とスロット底部との間に挿入して、固定子鉄心全体としての軸方向の磁気抵抗を小さくし、かつ固定子巻線の占積率を高めるようにした第２の従来の固定子が提案されている（例えば、特許文献４参照）。 In view of such a situation, a mixture of a metal magnetic powder such as iron powder and a resin is pressure-molded, and auxiliary teeth (heat radiating members) that cover the coil ends of the stator windings and the stator windings are accommodated. A first conventional stator has been proposed in which a cylindrical iron core main body is integrally formed to increase the axial heat transfer of the stator core and reduce the axial magnetic resistance. (For example, see Patent Document 3).
In addition, a magnetic material produced by molding and sintering magnetic particles such as iron powder is inserted between the stator winding and the bottom of the slot, so that the axial magnetic resistance of the entire stator core is reduced. A second conventional stator is proposed in which the space factor of the stator winding is increased and the space factor of the stator winding is increased (see, for example, Patent Document 4).

特開２００１−１１２１９７号公報JP 2001-112197 A 特開平０９−１０３０５２号公報JP 09-103052 A 特開２００５−１７６４７１号公報JP 2005-176471 A 特開２００４−３１２９２８号公報JP 2004-312928 A

第１の従来の固定子では、補助ティースと鉄心本体部とを金属磁性粉末と樹脂との混合物を加圧成型して一体物に作製しているので、鋼板シートを積層した鉄心に比較して、機械的強度が小さい。そこで、この固定子鉄心は、車両の内燃機関が発生する振動や走行時の衝撃が加わる回転電機の構成部材としての耐久性を確保できないという問題がある。 In the first conventional stator, the auxiliary teeth and the iron core main body are integrally formed by press-molding a mixture of metal magnetic powder and resin, so that compared to an iron core laminated with steel sheet sheets The mechanical strength is small. Therefore, this stator core has a problem that durability as a constituent member of a rotating electrical machine to which vibration generated by an internal combustion engine of a vehicle or impact during traveling is applied cannot be ensured.

また、第２の従来の固定子では、スロット内に収納されている固定子巻線の部位での発熱が磁性体内を軸方向に伝達され、磁性体の軸方向端面から放熱される。しかし、構造上、磁性体の軸方向端面の面積（放熱面積）を大きくすることができないので、冷媒を流す冷媒通路を磁性体内に形成して、固定子巻線の冷却性を高めていた。そこで、冷媒循環機構が必要となり、さらに冷媒のシール性を確保する必要があり、構成が複雑となるとともに、コストアップするという問題があった。 Further, in the second conventional stator, heat generated at the portion of the stator winding housed in the slot is transmitted in the axial direction through the magnetic body and is radiated from the axial end surface of the magnetic body. However, because of the structure, the area of the end face in the axial direction (heat radiation area) of the magnetic body cannot be increased, so that a cooling medium passage through which the refrigerant flows is formed in the magnetic body to improve the cooling performance of the stator winding. Therefore, it is necessary to provide a refrigerant circulation mechanism, and further, it is necessary to ensure the sealing performance of the refrigerant, which causes a problem that the configuration is complicated and the cost is increased.

この発明は、このような課題を解決するためになされたものであり、車両の内燃機関が発生する振動や走行時の衝撃に対する耐久性を確保できるとともに、かつ冷媒通路や冷媒循環機構を不要として、構成の簡略化および低コスト化が図られる固定子を有する回転電機を得ることを目的とする。 The present invention has been made to solve such a problem, and can ensure durability against vibration generated by an internal combustion engine of a vehicle and impact during travel, and eliminates the need for a refrigerant passage and a refrigerant circulation mechanism. An object of the present invention is to obtain a rotating electrical machine having a stator that can be simplified in structure and reduced in cost.

この発明による回転電機は、それぞれ椀状に成形され、開口を対向させて配設された第１および第２ブラケットと、上記第１および第２ブラケットの軸心位置に回転自在に支持されたシャフトに固着されて、上記第１および第２ブラケット内に配設された回転子と、磁性鋼板を積層して作製され、スロットが内周側に開口して周方向に配列され、軸方向両端部を上記第１および第２ブラケットの開口縁部に加圧挟持されて、上記回転子を囲繞して配設された円筒状の固定子鉄心、およびスロット収納部と該スロット収納部の端部間を連結するコイルエンドとからなり、上記スロット収納部を上記スロット内に収納させて上記固定子鉄心に巻装された固定子巻線を有する固定子と、上記回転子の回転に連動して上記第１および第２ブラケット内に冷却風を送風させて上記固定子巻線を冷却する送風手段と、を備えている。上記固定子は、上記スロットの底部と上記スロット収納部との間に形成された空間に挿入され、該スロット収納部に第１絶縁部材を介して接触する棒状鉄心部、および上記固定子鉄心の少なくとも一方の軸方向端部に、かつ上記コイルエンドの径方向外側に、上記コイルエンドに沿って互いに接触して周方向に円筒状に配列されて補助磁路を構成する複数の放熱部を備えている。そして、対応する上記放熱部と上記棒状鉄心部とが、絶縁被膜処理された金属磁性粉末を圧縮成型して一体に形成されている。
A rotating electrical machine according to the present invention includes first and second brackets that are each formed in a bowl shape and are arranged with their openings facing each other, and a shaft that is rotatably supported at the axial center positions of the first and second brackets. The rotor disposed in the first and second brackets and the magnetic steel plate are laminated, and the slots are opened in the inner peripheral side and arranged in the circumferential direction. Is pressed between the opening edges of the first and second brackets, and the cylindrical stator core is disposed so as to surround the rotor, and between the slot storage portion and the end of the slot storage portion. A stator having a stator winding wound around the stator core with the slot accommodating portion being accommodated in the slot, and interlocking with the rotation of the rotor, In first and second brackets The cooling air is blown and a, a blowing means for cooling the stator winding. The stator is inserted into a space formed between the bottom of the slot and the slot housing portion, and is in contact with the slot housing portion via a first insulating member, and the stator core Provided with at least one axial end and on the radially outer side of the coil end in contact with each other along the coil end and arranged in a cylindrical shape in the circumferential direction to form an auxiliary magnetic path ing. And the corresponding said thermal radiation part and the said rod-shaped iron core part are integrally formed by compression-molding the metal magnetic powder by which the insulating film process was carried out.

この発明によれば、放熱部が互いに接して円筒状に配列されて補助磁路を構成する。磁束の一部がスロット内に挿入された棒状鉄心部を軸方向に流れて放熱部に至り、補助磁路を周方向に流れる。そこで、鉄心全体としての磁気抵抗が低減される。
棒状鉄心部がスロット内に収納されているので、棒状鉄心部および放熱部の圧縮成型体は磁性鋼板を積層してなる高強度の固定子鉄心に保護され、圧縮成型体には過度のストレスが加わらない。そこで、この圧縮成型体を内燃機関の振動や走行時の衝撃が直接加わる回転電機に適用しても、十分な耐久性が得られる。
固定子巻線のスロット収納部での発熱は第１絶縁部材を介して棒状鉄心部に伝達され、棒状鉄心部内を軸方向に伝達して放熱面積の大きな放熱部に至り、放熱部から放熱される。一方、固定子巻線のコイルエンドでの発熱は直接、あるいは空気を介して放熱部に伝達され、放熱部から放熱される。そこで、冷媒通路や冷媒循環機構を用いることなく、固定子巻線での発熱を効率的に放熱でき、固定子の温度上昇を抑えることができる。 According to the present invention, the heat radiating portions are in contact with each other and arranged in a cylindrical shape to constitute the auxiliary magnetic path. A part of the magnetic flux flows in the axial direction through the rod-shaped iron core portion inserted in the slot, reaches the heat radiating portion, and flows in the circumferential direction through the auxiliary magnetic path. Therefore, the magnetic resistance of the entire iron core is reduced.
Since the rod-shaped iron core is housed in the slot, the compression-molded body of the rod-shaped iron core and the heat dissipating part is protected by a high-strength stator iron core made by laminating magnetic steel plates, and the compression-molded body is subjected to excessive stress. Don't join. Therefore, even when this compression molded body is applied to a rotating electric machine to which vibrations of an internal combustion engine and impact during traveling are directly applied, sufficient durability can be obtained.
The heat generated in the slot housing portion of the stator winding is transmitted to the rod-shaped iron core through the first insulating member, is transmitted in the axial direction through the rod-shaped iron core, reaches the heat radiating portion having a large heat radiation area, and is radiated from the heat radiating portion. The On the other hand, heat generated at the coil end of the stator winding is transmitted to the heat radiating portion directly or via air and is radiated from the heat radiating portion. Therefore, heat generated in the stator winding can be efficiently radiated without using a refrigerant passage or a refrigerant circulation mechanism, and an increase in the temperature of the stator can be suppressed.

実施の形態１．
図１はこの発明の実施の形態１に係る固定子が実装された車両用交流発電機を模式的に示す断面図、図２はこの発明の実施の形態１に係る補助鉄心が装着された固定子鉄心の要部を示す斜視図、図３はこの発明の実施の形態１に係る補助鉄心を示す斜視図、図４はこの発明の実施の形態１に係る固定子鉄心の製造方法を説明する平面図である。なお、図２では、固定子巻線２５は省略されている。 Embodiment 1 FIG.
1 is a cross-sectional view schematically showing an automotive alternator on which a stator according to Embodiment 1 of the present invention is mounted, and FIG. 2 is a view in which an auxiliary iron core according to Embodiment 1 of the present invention is mounted. FIG. 3 is a perspective view showing an auxiliary iron core according to Embodiment 1 of the present invention, and FIG. 4 explains a method for manufacturing the stator core according to Embodiment 1 of the present invention. It is a top view. In FIG. 2, the stator winding 25 is omitted.

図１乃至図３において、車両用交流発電機１は、それぞれ略椀形状に成形され、開口を対向させて配設されたアルミ製の第１ブラケットとしてのフロントブラケット２と第２ブラケットとしてのリヤブラケット３とからなるケース４と、シャフト５をケース４の軸心位置に軸受を介して支持されて、ケース４内に回転自在に配設された回転子６と、ケース４のフロント側に延出するシャフト５の端部に固着されたプーリ９と、回転子６の軸方向の両端面に固定された送風手段としてのファン１０と、回転子６に対して一定のエアギャップを有して、回転子６の外周を囲繞してケース４に固定された固定子２０と、シャフト５のリヤ側に固定され、回転子６に電流を供給する一対のスリップリング１１と、各スリップリング１１に摺接するようにケース４内に配設された一対のブラシ１２と、を備えている。なお、図示していないが、固定子２０で生じた交流を直流に整流する整流器、固定子２０で生じた交流電圧の大きさを調整する電圧調整器などがケース４内のリヤ側に配設されている。 1 to 3, an automotive alternator 1 is formed in a substantially bowl shape, and is a front bracket 2 as a first aluminum bracket and a rear as a second bracket, which are arranged with their openings facing each other. A case 4 comprising a bracket 3, a shaft 5 supported at the axial center of the case 4 via a bearing, a rotor 6 disposed rotatably in the case 4, and extending to the front side of the case 4. A pulley 9 fixed to the end of the shaft 5 to be taken out, a fan 10 as a blowing means fixed to both end surfaces of the rotor 6 in the axial direction, and a constant air gap with respect to the rotor 6 A stator 20 surrounding the outer periphery of the rotor 6 and fixed to the case 4; a pair of slip rings 11 fixed to the rear side of the shaft 5 for supplying current to the rotor 6; To make sliding contact A pair of brushes 12 disposed in casing 4, and a. Although not shown, a rectifier that rectifies alternating current generated in the stator 20 into direct current, a voltage regulator that adjusts the magnitude of the alternating voltage generated in the stator 20, and the like are disposed on the rear side in the case 4. Has been.

回転子６は、励磁電流が流されて磁束を発生する界磁コイル７と、界磁コイル７を覆うように設けられ、その磁束によって磁極が形成されるポールコア８と、シャフト５と、を備えている。そして、ポールコア８はその軸心位置に貫装されたシャフト５に固着されている。 The rotor 6 includes a field coil 7 that generates a magnetic flux when an excitation current is passed, a pole core 8 that is provided so as to cover the field coil 7, and a magnetic pole is formed by the magnetic flux, and a shaft 5. ing. The pole core 8 is fixed to a shaft 5 penetrating at the axial center position.

固定子２０は、円筒状の固定子鉄心２１と、固定子鉄心２１に巻装され、回転子６の回転に伴い、界磁コイル７からの磁束の変化で交流が生じる固定子巻線２５と、補助鉄心２６と、を備えている。
固定子鉄心２１は、円環状のコアバック２２と、コアバック２２の内周側に周方向に所定ピッチで配列されて、それぞれコアバック２２の内周側から一体に径方向内方に延出された複数のティース２３と、コアバック２２と隣り合うティース２３とで構成される内周側に開口する複数のスロット２４と、を備えている。
固定子巻線２５は、スロット２４内に収納されるスロット収納部２５ａと、固定子鉄心２１の軸方向端部側でスロット収納部２５ａ同士を連結するコイルエンド２５ｂと、を備えている。 The stator 20 has a cylindrical stator core 21 and a stator winding 25 that is wound around the stator core 21 and generates an alternating current due to a change in magnetic flux from the field coil 7 as the rotor 6 rotates. The auxiliary iron core 26 is provided.
The stator core 21 is arranged in an annular core back 22 and a predetermined pitch in the circumferential direction on the inner peripheral side of the core back 22, and extends radially inward from the inner peripheral side of the core back 22. And a plurality of slots 24 opened to the inner peripheral side, which are constituted by the core back 22 and the adjacent teeth 23.
The stator winding 25 includes a slot accommodating portion 25 a accommodated in the slot 24, and a coil end 25 b that connects the slot accommodating portions 25 a on the axial end side of the stator core 21.

補助鉄心２６は、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部２７と、棒状鉄心部２７の一端に一体に形成された放熱部２８と、を備えている。棒状鉄心部２７は、スロット２４の長さ（固定子鉄心２１の軸方向の長さ）に等しい長さを有し、固定子巻線２５のスロット収納部２５ａがスロット２４内に収納された際に、スロット収納部２５ａとスロット２４の底部との間に形成されるスペースに対応する断面形状を有している。放熱部２８は、２スロットピッチに相当する長さの幅、固定子巻線２５のコイルエンド２５ｂの高さ（固定子鉄心２１の端面からコイルエンド２５ｂの頂部までの高さ）に相当する高さ、かつ棒状鉄心部２７の厚みに相当する厚みを有する円弧状板に作製され、棒状鉄心部２７の一端に、棒状鉄心部２７の幅方向両側に均等に延出するように形成されている。切り欠き２９が、放熱部２８の他端面の棒状鉄心部２７の幅方向両側の部位に、放熱部２８の厚み方向に貫通して設けられている。なお、放熱部２８の円弧状板の内周面の曲率は、固定子鉄心２１に巻装された固定子巻線２５のコイルエンド２５ｂ（コイルエンド群）の外径面の曲率に一致している。 The auxiliary iron core 26 is produced by compression-molding a pure iron-based powder that has been treated with an insulating coating, and includes a rod-shaped iron core portion 27 and a heat radiating portion 28 that is integrally formed at one end of the rod-shaped iron core portion 27. The rod-shaped iron core portion 27 has a length equal to the length of the slot 24 (the axial length of the stator iron core 21), and the slot accommodating portion 25a of the stator winding 25 is accommodated in the slot 24. Further, it has a cross-sectional shape corresponding to a space formed between the slot storage portion 25 a and the bottom portion of the slot 24. The heat dissipating part 28 has a width corresponding to a two-slot pitch and a height corresponding to the height of the coil end 25b of the stator winding 25 (height from the end surface of the stator core 21 to the top of the coil end 25b). And it is produced in the circular-arc-shaped board which has the thickness equivalent to the thickness of the rod-shaped iron core part 27, and is formed in the end of the rod-shaped iron core part 27 so that it may extend equally to the width direction both sides of the rod-shaped iron core part 27. . Cutouts 29 are provided in portions on both sides in the width direction of the rod-shaped core portion 27 on the other end surface of the heat dissipation portion 28 so as to penetrate in the thickness direction of the heat dissipation portion 28. The curvature of the inner peripheral surface of the arc-shaped plate of the heat radiating portion 28 matches the curvature of the outer diameter surface of the coil end 25b (coil end group) of the stator winding 25 wound around the stator core 21. Yes.

このように構成された固定子２０を組み立てるには、まず、図４に示されるように、帯状の磁性鋼板１５を螺旋状に所定回巻回して円筒状に積層して固定子鉄心２１を作製する。ついで、固定子巻線２５のスロット収納部２５ａをスロット２４に収納して、固定子巻線２５を固定子鉄心２１に巻装する。このとき、コイルエンド２５ｂは、固定子鉄心２１の軸方向両端部に周方向に配列され、円環状のコイルエンド群を構成する。ついで、スロット２４内に収納された固定子巻線２５のスロット収納部２５ａを径方向内方に押圧し、スロット収納部２５ａとスロット２４の底部との間にスペースを形成する。そして、補助鉄心２６の棒状鉄心部２７および放熱部２８の幅方向を周方向に一致させ、放熱部２８の内周面を径方向内方に向けて、棒状鉄心部２７を上述のスペースに挿入し、放熱部２８をティース２３の端面に当接させる。 In order to assemble the stator 20 configured as described above, first, as shown in FIG. 4, a belt-shaped magnetic steel plate 15 is spirally wound a predetermined number of times to form a stator core 21 by stacking in a cylindrical shape. To do. Next, the slot accommodating portion 25 a of the stator winding 25 is accommodated in the slot 24, and the stator winding 25 is wound around the stator core 21. At this time, the coil ends 25b are circumferentially arranged at both ends in the axial direction of the stator core 21, and constitute an annular coil end group. Next, the slot accommodating portion 25 a of the stator winding 25 accommodated in the slot 24 is pressed radially inward to form a space between the slot accommodating portion 25 a and the bottom of the slot 24. Then, the rod-shaped core part 27 and the heat dissipating part 28 of the auxiliary iron core 26 are aligned in the circumferential direction, the inner peripheral surface of the heat dissipating part 28 is directed radially inward, and the bar-shaped iron core part 27 is inserted into the above-described space. Then, the heat radiating portion 28 is brought into contact with the end surface of the tooth 23.

ここで、補助鉄心２６は、固定子鉄心２１のフロント側から１スロットおきの各スロット２４に挿入され、その後、補助鉄心２６は、固定子鉄心２１のリヤ側から残るスロット２４に挿入される。これにより、補助鉄心２６の放熱部２８は、固定子鉄心２１のフロント側およびリヤ側のそれぞれの端面上に、周方向に互いに接して円筒状に配列される。そして、円筒状に配列された放熱部２８の内周面は、円環状のコイルエンド群の最外径部に位置するコイルエンド２５ｂの外径面に接している。各切り欠き２９が固定子鉄心２１のティース２３と協働して径方向に延びる通風路を構成している。スロット収納部２５ａが、スプリングバックにより、棒状鉄心部２７に接している。 Here, the auxiliary iron core 26 is inserted into every other slot 24 from the front side of the stator iron core 21, and then the auxiliary iron core 26 is inserted into the remaining slot 24 from the rear side of the stator iron core 21. Thereby, the heat radiating portion 28 of the auxiliary iron core 26 is arranged in a cylindrical shape on the front and rear end faces of the stator iron core 21 in contact with each other in the circumferential direction. And the internal peripheral surface of the thermal radiation part 28 arranged in the cylindrical form is in contact with the outer diameter surface of the coil end 25b located in the outermost diameter part of an annular | circular shaped coil end group. Each notch 29 forms a ventilation path extending in the radial direction in cooperation with the teeth 23 of the stator core 21. The slot accommodating portion 25a is in contact with the rod-shaped iron core portion 27 by a spring back.

ついで、エポキシ樹脂などの絶縁性樹脂（図示せず）をコイルエンド２５ｂに塗布、硬化し、コイルエンド２５ｂと放熱部２８とを固着し、固定子２０を得る。なお、補助鉄心２６の棒状鉄心部２７とスロット収納部２５ａとの間には、第１絶縁部材１６が介装され、放熱部２８とコイルエンド２５ｂとの間には、第２絶縁部材１７が介装され、補助鉄心２６と固定子巻線２５との電気的絶縁性が確保されている。第１絶縁部材１６および第２絶縁部材１７は、例えば棒状鉄心部２７および放熱部２８にワニスなどの絶縁性樹脂を塗布して形成される。 Next, an insulating resin (not shown) such as an epoxy resin is applied to the coil end 25b and cured, and the coil end 25b and the heat radiation portion 28 are fixed to obtain the stator 20. The first insulating member 16 is interposed between the rod-shaped iron core portion 27 of the auxiliary iron core 26 and the slot housing portion 25a, and the second insulating member 17 is interposed between the heat radiating portion 28 and the coil end 25b. The electrical insulation between the auxiliary iron core 26 and the stator winding 25 is ensured. The first insulating member 16 and the second insulating member 17 are formed, for example, by applying an insulating resin such as varnish to the rod-shaped iron core portion 27 and the heat radiating portion 28.

このように組み立てられた固定子２０は、固定子鉄心２１のコアバック２２の軸方向両端面を軸方向両側からフロントブラケット２およびリヤブラケット３の開口縁部に加圧挟持されて、回転子６の外周を囲繞してケース４に取り付けられる。この時、放熱部２８の外周面がフロントブラケット２およびリヤブラケット３の内周面に密接している。 In the stator 20 assembled in this manner, both end surfaces in the axial direction of the core back 22 of the stator core 21 are pressure-clamped from both sides in the axial direction to the opening edges of the front bracket 2 and the rear bracket 3, so that the rotor 6 Is attached to the case 4 so as to surround the outer periphery thereof. At this time, the outer peripheral surface of the heat radiating portion 28 is in close contact with the inner peripheral surfaces of the front bracket 2 and the rear bracket 3.

つぎに、このように構成された車両用交流発電機１の動作について説明する。
まず、電流がバッテリ（図示せず）からブラシ１２およびスリップリング１１を介して回転子６の界磁コイル７に供給され、磁束が発生される。この磁束により、ポールコア８の爪状磁極部が着磁される。
一方、エンジンの回転トルクがベルト（図示せず）およびプーリ９を介してシャフト５に伝達され、回転子６が回転される。そこで、回転磁界が固定子２０の固定子巻線２５に与えられ、起電力が固定子巻線２５に発生する。この交流の起電力が整流器で直流電流に整流され、バッテリが充電され、或いは、電気負荷に供給される。 Next, the operation of the vehicular AC generator 1 configured as described above will be described.
First, a current is supplied from a battery (not shown) to the field coil 7 of the rotor 6 through the brush 12 and the slip ring 11, and a magnetic flux is generated. By this magnetic flux, the claw-shaped magnetic pole portion of the pole core 8 is magnetized.
On the other hand, the rotational torque of the engine is transmitted to the shaft 5 via a belt (not shown) and a pulley 9, and the rotor 6 is rotated. Therefore, a rotating magnetic field is applied to the stator winding 25 of the stator 20, and an electromotive force is generated in the stator winding 25. The AC electromotive force is rectified into a DC current by a rectifier, and the battery is charged or supplied to an electric load.

この実施の形態１によれば、補助鉄心２６が絶縁被膜処理された純鉄系粉末を圧縮成形して作製されているので、補助鉄心２６の密度を７．６Ｋｇ／ｄｍ^３以上とすることができ、溶鉄製の鉄心に極めて近い熱伝導性および磁気特性を得ることができる。このように作製された補助鉄心２６は、等方性の熱伝導性および磁気特性を有する。 According to the first embodiment, since the auxiliary iron core 26 is produced by compression molding the pure iron-based powder with the insulating coating treatment, the density of the auxiliary iron core 26 can be set to 7.6 kg / dm ³ or more. It is possible to obtain thermal conductivity and magnetic properties very close to those of a molten iron core. The auxiliary iron core 26 produced in this way has isotropic thermal conductivity and magnetic properties.

補助鉄心２６の放熱部２８が互いに接して周方向に円筒状に配列されている。そこで、ポールコア８からエアギャップを介してティース２３に入った磁束の一部が、スロット２４内に挿入されている棒状鉄心部２７を介して軸方向に流れて放熱部２８に至り、放熱部２８で構成される円筒体を周方向に流れる。一方、ティース２３に入った磁束の残部が、コアバック２２を通って周方向に流れる。このように、周方向に配列された放熱部２８の円筒体がコアバック２２の補助磁路を構成するので、固定子鉄心２１のみの場合に比べ、固定子２０の全磁路における磁気抵抗が小さくなり、磁気飽和が抑制され、発電効率を高めることができる。 The heat dissipation portions 28 of the auxiliary iron core 26 are in contact with each other and are arranged in a cylindrical shape in the circumferential direction. Therefore, a part of the magnetic flux that has entered the teeth 23 from the pole core 8 through the air gap flows in the axial direction through the rod-shaped iron core portion 27 inserted into the slot 24 to reach the heat radiating portion 28. Flows in the circumferential direction. On the other hand, the remainder of the magnetic flux that has entered the teeth 23 flows in the circumferential direction through the core back 22. Thus, since the cylindrical bodies of the heat radiating portions 28 arranged in the circumferential direction constitute the auxiliary magnetic path of the core back 22, the magnetic resistance in the entire magnetic path of the stator 20 is smaller than in the case of only the stator core 21. It becomes smaller, magnetic saturation is suppressed, and power generation efficiency can be increased.

棒状鉄心部２７がスロット２４内に挿入されているので、棒状鉄心部２７が磁性鋼板１５を積層して構成された機械的強度の大きい固定子鉄心２１により保護され、過度のストレスが棒状鉄心部２７に加わることがない。そこで、絶縁被膜処理された純鉄系粉末を圧縮成型して作製された補助鉄心２６は、車両の内燃機関が発生する振動や走行時の衝撃が加わる車両用交流発電機１の構成部材としての耐久性を確保できる。 Since the rod-shaped iron core portion 27 is inserted into the slot 24, the rod-shaped iron core portion 27 is protected by the stator core 21 having a high mechanical strength formed by laminating the magnetic steel plates 15, and excessive stress is applied to the rod-shaped iron core portion. 27 will not join. Therefore, the auxiliary iron core 26 produced by compression molding the pure iron-based powder treated with the insulating coating is used as a constituent member of the vehicle alternator 1 to which vibration generated by the internal combustion engine of the vehicle and impact during traveling are applied. Durability can be secured.

補助鉄心２６が絶縁被膜処理された純鉄系粉末を圧縮成型して作製されているので、渦電流損を大幅に抑えることができる。
棒状鉄心部２７がスロット２４内に挿入されているので、固定子巻線２５の占積率が高められ、スロット２４の底部における不要な漏洩磁束を低減できる。
固定子鉄心２１は、磁性鋼板１５を螺旋状に巻回して作製されているので、スロット２４の底部付近のコアバック２２の磁気特性は、曲げ加工に伴う塑性変形や残留応力により大きく劣化している。そこで、純鉄系粉末を圧縮成型してなる棒状鉄心部２７でコアバック２２の磁気特性の劣化部分を置き換えても、回転軸に垂直な平面内を通る磁路としての磁気的影響は問題とならない。 Since the auxiliary iron core 26 is produced by compression molding a pure iron-based powder that has been treated with an insulating coating, eddy current loss can be greatly suppressed.
Since the rod-shaped iron core portion 27 is inserted into the slot 24, the space factor of the stator winding 25 is increased, and unnecessary leakage magnetic flux at the bottom of the slot 24 can be reduced.
Since the stator core 21 is produced by spirally winding the magnetic steel plate 15, the magnetic properties of the core back 22 near the bottom of the slot 24 are greatly degraded by plastic deformation and residual stress accompanying bending. Yes. Therefore, even when the deteriorated portion of the magnetic properties of the core back 22 is replaced with a rod-shaped core 27 formed by compression molding pure iron powder, the magnetic influence as a magnetic path passing through a plane perpendicular to the rotation axis is a problem. Don't be.

固定子巻線２５のスロット収納部２５ａおよびコイルエンド２５ｂは、それぞれ補助鉄心２６の棒状鉄心部２７および放熱部２８に密接している。そこで、固定子巻線２５のコイルエンド２５ｂで発生した熱は放熱部２８に伝達され、放熱部２８から放熱される。また、固定子巻線２５のスロット収納部２５ａで発生した熱は、棒状鉄心部２７に伝達され、棒状鉄心部２７内を軸方向に伝達されて放熱部２８に至り、棒状鉄心部２７より放熱面積の大きな放熱部２８から放熱される。これにより、固定子巻線２５での発熱が効率的に放熱され、固定子２０の過度の温度上昇が抑えられる。そこで、冷媒通路や冷媒循環機構が不要となり、簡素な、安価な構成で、固定子２０の冷却性を向上させることができる。 The slot accommodating portion 25a and the coil end 25b of the stator winding 25 are in close contact with the rod-shaped iron core portion 27 and the heat radiating portion 28 of the auxiliary iron core 26, respectively. Therefore, the heat generated at the coil end 25 b of the stator winding 25 is transmitted to the heat radiating portion 28 and radiated from the heat radiating portion 28. Further, the heat generated in the slot accommodating portion 25 a of the stator winding 25 is transmitted to the rod-shaped core portion 27, is transmitted in the axial direction through the rod-shaped core portion 27, reaches the heat radiating portion 28, and radiates heat from the rod-shaped core portion 27. Heat is radiated from the heat radiating section 28 having a large area. Thereby, the heat generated in the stator winding 25 is efficiently radiated and an excessive temperature rise of the stator 20 is suppressed. Therefore, the refrigerant passage and the refrigerant circulation mechanism are not required, and the cooling performance of the stator 20 can be improved with a simple and inexpensive configuration.

補助鉄心２６は絶縁被膜処理された純鉄系粉末を圧縮成型して作製されているので、補助鉄心２６の熱伝導率は空気より大きい。そこで、固定子巻線２５のスロット収納部２５ａおよびコイルエンド２５ｂが補助鉄心２６に接触しているので、固定子巻線２５で発生した熱はより効果的に放熱される。さらに、放熱部２８が絶縁部材を介してケース４の内壁面に密接しているので、放熱部２８に伝達された熱が効率的にケース４に伝達され、放熱面積の大きなケース４から放熱され、固定子２０の冷却性が一層向上される。 Since the auxiliary iron core 26 is made by compression-molding pure iron-based powder treated with an insulating coating, the heat conductivity of the auxiliary iron core 26 is larger than that of air. Therefore, since the slot accommodating portion 25a and the coil end 25b of the stator winding 25 are in contact with the auxiliary iron core 26, the heat generated in the stator winding 25 is radiated more effectively. Further, since the heat radiating portion 28 is in close contact with the inner wall surface of the case 4 via the insulating member, the heat transmitted to the heat radiating portion 28 is efficiently transmitted to the case 4 and radiated from the case 4 having a large heat radiating area. The cooling performance of the stator 20 is further improved.

補助鉄心２６が絶縁被膜処理された純鉄系粉末を圧縮成形して作製されているので、補助鉄心２６は磁性鋼板１５に比べて著しく大きな電気抵抗を有する。そこで、ワニスなどの絶縁性樹脂を補助鉄心２６に塗布して形成したものを第１および第２絶縁部材１６，１７に用いても、従来の樹脂製のインシュレータを介装した場合と同等のレベルの電気絶縁性を確保することができる。この場合、補助鉄心２６と固定子巻線２５との間の第１および第２絶縁部材１６，１７を薄くすることができ、第１および第２絶縁部材１６，１７を介しての熱伝達がし易くなり、固定子２０の冷却性が向上される。 Since the auxiliary iron core 26 is produced by compression-molding pure iron-based powder that has been treated with an insulating coating, the auxiliary iron core 26 has a significantly larger electric resistance than the magnetic steel plate 15. Therefore, even if an insulating resin such as varnish is applied to the auxiliary iron core 26 and used for the first and second insulating members 16 and 17, the same level as when a conventional resin insulator is interposed. The electrical insulation can be ensured. In this case, the first and second insulating members 16 and 17 between the auxiliary iron core 26 and the stator winding 25 can be thinned, and heat transfer via the first and second insulating members 16 and 17 can be performed. This improves the cooling performance of the stator 20.

切り欠き２９が放熱部２８の他端面の棒状鉄心部２７の両側に形成されているので、切り欠き２９がティース２３と協働して通風路を構成する。ファン１０により遠心方向に曲げられた冷却風は、コイルエンド２５ｂと固定子鉄心２１の端面との間に形成された隙間および上述の通風路を通って径方向外方に流れ、ケース４に形成された排気孔から排気される。そこで、補助鉄心２６を配設することに起因する冷却性能の低下が抑制される。 Since the notches 29 are formed on both sides of the rod-shaped core portion 27 on the other end surface of the heat radiating portion 28, the notches 29 cooperate with the teeth 23 to form a ventilation path. The cooling air bent in the centrifugal direction by the fan 10 flows radially outward through the gap formed between the coil end 25 b and the end surface of the stator core 21 and the above-described ventilation path, and is formed in the case 4. The air is exhausted from the exhaust holes. Therefore, a decrease in cooling performance due to the provision of the auxiliary iron core 26 is suppressed.

実施の形態２．
図５はこの発明の実施の形態２に係る固定子における補助鉄心が装着された固定子鉄心の要部を示す斜視図、図６はこの発明の実施の形態２に係る固定子に適用される補助鉄心を示す斜視図である。なお、図５では、固定子巻線２５は省略されている。 Embodiment 2. FIG.
5 is a perspective view showing a main part of a stator core on which an auxiliary iron core is mounted in a stator according to Embodiment 2 of the present invention, and FIG. 6 is applied to the stator according to Embodiment 2 of the present invention. It is a perspective view which shows an auxiliary iron core. In FIG. 5, the stator winding 25 is omitted.

図６において、補助鉄心３０は、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部３１と、棒状鉄心部３１の一端に一体に形成された放熱部３２と、を備えている。棒状鉄心部３１は、スロット２４の長さより長い長さを有し、固定子巻線２５のスロット収納部２５ａがスロット２４内に収納された際に、スロット収納部２５ａとスロット２４の底部との間に形成されるスペースに対応する断面形状を有している。放熱部３２は、１スロットピッチに相当する長さの幅、固定子巻線２５のコイルエンド２５ｂの高さに相当する高さ、かつ棒状鉄心部３１の厚みに相当する厚みを有する円弧状板に作製され、棒状鉄心部３１の一端に、棒状鉄心部３１の幅方向両側に均等に延出するように形成されている。切り欠き３３が、放熱部３２の他端面の幅方向両端部を、放熱部３２の厚み方向全域に渡って除去して設けられている。放熱部３２の円弧状板の内周面の曲率は、固定子鉄心２１に巻装された固定子巻線２５のコイルエンド２５ｂの外径面の曲率に一致している。 In FIG. 6, the auxiliary iron core 30 is produced by compression molding a pure iron-based powder that has been subjected to an insulating coating, and includes a rod-shaped iron core portion 31 and a heat radiating portion 32 integrally formed at one end of the rod-shaped iron core portion 31. I have. The rod-shaped iron core portion 31 has a length longer than the length of the slot 24, and when the slot accommodating portion 25 a of the stator winding 25 is accommodated in the slot 24, the slot-like iron core portion 31 is formed between the slot accommodating portion 25 a and the bottom portion of the slot 24. It has a cross-sectional shape corresponding to a space formed therebetween. The heat radiating portion 32 has an arc-shaped plate having a width corresponding to one slot pitch, a height corresponding to the height of the coil end 25 b of the stator winding 25, and a thickness corresponding to the thickness of the rod-shaped core portion 31. And is formed at one end of the rod-shaped iron core portion 31 so as to extend evenly on both sides in the width direction of the rod-shaped iron core portion 31. The notches 33 are provided by removing both end portions in the width direction of the other end face of the heat radiating portion 32 over the entire thickness direction of the heat radiating portion 32. The curvature of the inner peripheral surface of the arc-shaped plate of the heat radiating portion 32 matches the curvature of the outer diameter surface of the coil end 25 b of the stator winding 25 wound around the stator core 21.

このように構成された補助鉄心３０は、固定子巻線２５を固定子鉄心２１に巻装し、スロット２４内に収納された固定子巻線２５のスロット収納部２５ａを径方向内方に押圧し、スロット収納部２５ａとスロット２４の底部との間にスペースを形成した後、固定子鉄心２１のフロント側から各スロット２４に挿入される。この時、図５に示されるように、補助鉄心３０の棒状鉄心部３１および放熱部３２の幅方向を周方向に一致させ、放熱部３２の内周面を径方向内方に向けて、棒状鉄心部２７を上述のスペースに挿入し、放熱部３２の他端面をティース２３の端面に当接させる。 The auxiliary iron core 30 configured in this manner winds the stator winding 25 around the stator iron core 21 and presses the slot housing portion 25a of the stator winding 25 housed in the slot 24 radially inward. Then, after forming a space between the slot accommodating portion 25 a and the bottom of the slot 24, the space is inserted into each slot 24 from the front side of the stator core 21. At this time, as shown in FIG. 5, the rod-shaped core part 31 of the auxiliary iron core 30 and the heat dissipating part 32 are aligned in the circumferential direction so that the inner peripheral surface of the heat dissipating part 32 faces radially inward. The core part 27 is inserted into the above-described space, and the other end face of the heat radiating part 32 is brought into contact with the end face of the tooth 23.

補助鉄心３０の放熱部３２は、固定子鉄心２１のフロント側の端面上に、周方向に互いに接して円筒状に配列される。そして、円筒状に配列された放熱部３２の内周面は固定子巻線２５のコイルエンド２５ｂの外径面に第２絶縁部材１７を介して接している。各切り欠き３３が固定子鉄心２１のティース２３と協働して径方向に延びる通風路を構成している。スロット収納部２５ａが、スプリングバックにより、棒状鉄心部３１に第１絶縁部材１６を介して接している。
なお、エポキシ樹脂などの絶縁性樹脂がコイルエンド２５ｂに塗布、硬化され、放熱部３２がコイルエンド２５ｂに固着されている。 The heat radiating portions 32 of the auxiliary iron core 30 are arranged in a cylindrical shape on the front end surface of the stator iron core 21 in contact with each other in the circumferential direction. The inner peripheral surface of the heat radiating portion 32 arranged in a cylindrical shape is in contact with the outer diameter surface of the coil end 25 b of the stator winding 25 via the second insulating member 17. Each notch 33 forms a ventilation path extending in the radial direction in cooperation with the teeth 23 of the stator core 21. The slot housing portion 25a is in contact with the rod-shaped iron core portion 31 via the first insulating member 16 by a spring back.
Insulating resin such as epoxy resin is applied to the coil end 25b and cured, and the heat radiating portion 32 is fixed to the coil end 25b.

この実施の形態２によれば、実施の形態１の効果に加えて、下記の効果が得られる。
補助鉄心３０が固定子鉄心２１のフロント側から各スロット２４に挿入されているので、補助鉄心３０の挿入方向が一方向となり、補助鉄心３０の装着作業性が向上される。
固定子鉄心２１のフロント側端部には、放熱部３２を互いに接して周方向に連設して構成された円筒体が配設され、固定子鉄心２１のリヤ側端部には、棒状鉄心部３１の延出部が所定の隙間を持って１スロットピッチで周方向に配列されている。これにより、整流器や電圧調整器などの発熱部品が配設されるリヤ側における通風抵抗を小さくすることができる。そこで、ファン１０により送風されるリヤ側の冷却風の流量を多くすることができ、リヤ側に配設されている発熱部品を効果的に冷却することができる。一方、固定子巻線２５で発生する熱は、主に、フロント側に位置する放熱面積の大きな放熱部３２から放熱され、固定子巻線２５の過度の温度上昇が抑制される。 According to the second embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.
Since the auxiliary iron core 30 is inserted into each slot 24 from the front side of the stator iron core 21, the insertion direction of the auxiliary iron core 30 becomes one direction, and the workability of attaching the auxiliary iron core 30 is improved.
At the front side end of the stator core 21, a cylindrical body constituted by connecting the heat radiating portions 32 to each other in a circumferential direction is disposed, and at the rear side end of the stator core 21, a rod-shaped core is provided. The extending portions of the portions 31 are arranged in the circumferential direction at a one-slot pitch with a predetermined gap. Thereby, the ventilation resistance in the rear side by which heat-emitting components, such as a rectifier and a voltage regulator, are arrange | positioned can be made small. Therefore, the flow rate of the cooling air on the rear side blown by the fan 10 can be increased, and the heat generating component disposed on the rear side can be effectively cooled. On the other hand, the heat generated in the stator winding 25 is mainly radiated from the heat radiating portion 32 having a large heat radiating area located on the front side, and an excessive temperature rise of the stator winding 25 is suppressed.

実施の形態３．
図７はこの発明の実施の形態３に係る固定子に適用される補助鉄心を示す斜視図である。 Embodiment 3 FIG.
FIG. 7 is a perspective view showing an auxiliary iron core applied to a stator according to Embodiment 3 of the present invention.

図７において、補助鉄心３０Ａは、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部３１と、棒状鉄心部３１の一端に一体に形成された放熱部３４と、を備えている。放熱部３４は、１スロットピッチに相当する長さの幅、固定子巻線２５のコイルエンド２５ｂの高さに相当する高さ、かつ棒状鉄心部３１の厚みに相当する厚みを有する円弧状板に作製され、棒状鉄心部３１の一端に、棒状鉄心部３１の幅方向一側に大きく延出するように形成されている。切り欠き３５が、放熱部３４の他端面の幅方向一端部を、放熱部３４の厚み方向全域に渡って除去して設けられている。放熱部３４の円弧状板の内周面の曲率は、固定子鉄心２１に巻装された固定子巻線２５のコイルエンド２５ｂの外径面の曲率に一致している。なお、実施の形態３は、補助鉄心３０に代えて補助鉄心３０Ａを用いている点を除いて、上記実施の形態２と同様に構成されている。 In FIG. 7, the auxiliary iron core 30 A is produced by compression-molding a pure iron-based powder that has been treated with an insulating coating, and includes a rod-shaped iron core portion 31 and a heat radiating portion 34 that is integrally formed at one end of the rod-shaped iron core portion 31. I have. The heat dissipating part 34 is an arc-shaped plate having a width corresponding to one slot pitch, a height corresponding to the height of the coil end 25b of the stator winding 25, and a thickness corresponding to the thickness of the rod-shaped core part 31. And is formed at one end of the rod-shaped iron core portion 31 so as to extend greatly to one side in the width direction of the rod-shaped iron core portion 31. A notch 35 is provided by removing one end in the width direction of the other end surface of the heat radiating portion 34 over the entire thickness direction of the heat radiating portion 34. The curvature of the inner peripheral surface of the arc-shaped plate of the heat radiating portion 34 matches the curvature of the outer diameter surface of the coil end 25 b of the stator winding 25 wound around the stator core 21. The third embodiment is configured in the same manner as in the second embodiment except that an auxiliary iron core 30A is used instead of the auxiliary iron core 30.

このように構成された補助鉄心３０Ａは、固定子巻線２５のスロット収納部２５ａと固定子鉄心２１のスロット２４の底部との間にスペースに固定子鉄心２１のフロント側から挿入される。補助鉄心３０Ａの放熱部３４は、固定子鉄心２１のフロント側の端面上に、周方向に互いに接して円筒状に配列される。そして、棒状鉄心部３１が第１絶縁部材を介して固定子巻線２５のスロット収納部２５ａに接し、放熱部３４の内周面は固定子巻線２５のコイルエンド２５ｂの外径面に第２絶縁部材を介して接している。切り欠き３５が固定子鉄心２１のティース２３と協働して径方向に延びる通風路を構成している。
従って、この実施の形態３においても、上記実施の形態２と同様の効果が得られる。 The auxiliary iron core 30 A configured in this way is inserted from the front side of the stator iron core 21 into a space between the slot housing portion 25 a of the stator winding 25 and the bottom of the slot 24 of the stator iron core 21. The heat radiating portion 34 of the auxiliary iron core 30 A is arranged in a cylindrical shape on the front end surface of the stator iron core 21 in contact with each other in the circumferential direction. The rod-shaped iron core portion 31 is in contact with the slot accommodating portion 25a of the stator winding 25 via the first insulating member, and the inner peripheral surface of the heat radiating portion 34 is connected to the outer diameter surface of the coil end 25b of the stator winding 25. 2 are in contact via an insulating member. The notch 35 forms a ventilation path extending in the radial direction in cooperation with the teeth 23 of the stator core 21.
Therefore, also in the third embodiment, the same effect as in the second embodiment can be obtained.

実施の形態４．
図８はこの発明の実施の形態４に係る固定子に適用される補助鉄心を示す斜視図、図９はこの発明の実施の形態４に係る固定子における固定子鉄心を作製する方法を説明する要部斜視図である。 Embodiment 4 FIG.
FIG. 8 is a perspective view showing an auxiliary iron core applied to a stator according to Embodiment 4 of the present invention, and FIG. 9 explains a method for producing the stator iron core in the stator according to Embodiment 4 of the present invention. It is a principal part perspective view.

図８において、補助鉄心４０は、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部４１と、棒状鉄心部４１の一端に一体に形成された放熱部４２と、棒状鉄心部４１の他端に一体に形成された係止部４４とを備えている。棒状鉄心部４１は、スロット２４の長さと等しい長さを有し、固定子巻線のスロット収納部がスロット内に収納された際に、スロット収納部とスロットの底部との間に形成されるスペースに対応する断面形状を有している。放熱部４２は、１スロットピッチに相当する長さの幅、固定子巻線のコイルエンドの高さに相当する高さ、かつ棒状鉄心部３１の厚みに相当する厚みを有する円弧状板に作製され、棒状鉄心部４１の一端に、棒状鉄心部４１の幅方向両側に均等に延出するように形成されている。切り欠き４３が、放熱部４２の他端面の幅方向両端部を、放熱部４２の厚み方向全域に渡って除去して設けられている。係止部４４は、スロットの周方向幅より広く、かつ１スロットピッチ以下の幅に形成されている。放熱部４２の円弧状板の内周面の曲率は、固定子鉄心に巻装された固定子巻線のコイルエンドの外径面の曲率に一致している。 In FIG. 8, the auxiliary iron core 40 is produced by compression-molding a pure iron-based powder that has been treated with an insulating coating, and includes a rod-shaped iron core portion 41, a heat radiation portion 42 that is integrally formed at one end of the rod-shaped iron core portion 41, and a rod-like shape. The other end of the iron core part 41 is provided with a locking part 44 formed integrally. The rod-shaped iron core portion 41 has a length equal to the length of the slot 24, and is formed between the slot accommodating portion and the bottom portion of the slot when the slot accommodating portion of the stator winding is accommodated in the slot. It has a cross-sectional shape corresponding to the space. The heat dissipating part 42 is formed as an arc-shaped plate having a width corresponding to one slot pitch, a height corresponding to the height of the coil end of the stator winding, and a thickness corresponding to the thickness of the rod-shaped core part 31. It is formed at one end of the rod-shaped iron core portion 41 so as to extend uniformly on both sides in the width direction of the rod-shaped iron core portion 41. The notches 43 are provided by removing both end portions in the width direction of the other end surface of the heat radiating portion 42 over the entire thickness direction of the heat radiating portion 42. The locking portion 44 is formed to have a width that is wider than the circumferential width of the slot and is equal to or less than one slot pitch. The curvature of the inner peripheral surface of the arc-shaped plate of the heat radiating portion 42 matches the curvature of the outer diameter surface of the coil end of the stator winding wound around the stator core.

この実施の形態４による固定子を組み立てるには、まず、所定枚の所定長さの磁性鋼板を積層して直方体の積層鉄心１８を作製する。ついで、図９に示されるように、棒状鉄心部４１を積層鉄心１８のスロット１９の開口側からスロット１９の底部に挿入し、放熱部４２および係止部４４を積層鉄心１８の積層方向の両端に位置させて、補助鉄心４０を積層鉄心１８に装着する。ついで、図示していないが、固定子巻線のスロット収納部をスロット１９に収納して、固定子巻線を積層鉄心１８に装着する。そして、積層鉄心１８を円筒状に曲げ加工し、円筒状に曲げられた積層鉄心１８の両端面を突き合わせ、突き合わせ部を溶接して、円筒状の固定子鉄心を作製する。このように作製された固定子鉄心は、上記実施の形態１〜３における固定子鉄心２１と同一の形状である。これにより、固定子巻線および補助鉄心４０を固定子鉄心に装着した状態の固定子が組み立てられる。 In order to assemble the stator according to the fourth embodiment, first, a predetermined number of magnetic steel plates having a predetermined length are stacked to produce a rectangular parallelepiped laminated core 18. Next, as shown in FIG. 9, the rod-shaped iron core portion 41 is inserted into the bottom of the slot 19 from the opening side of the slot 19 of the laminated iron core 18, and the heat radiating portion 42 and the locking portion 44 are arranged at both ends in the lamination direction of the laminated iron core 18. Then, the auxiliary iron core 40 is mounted on the laminated iron core 18. Next, although not shown, the slot accommodating portion of the stator winding is accommodated in the slot 19, and the stator winding is mounted on the laminated core 18. Then, the laminated iron core 18 is bent into a cylindrical shape, both end faces of the laminated iron core 18 bent into a cylindrical shape are butted together, and the butted portions are welded to produce a cylindrical stator core. The stator core produced in this way has the same shape as the stator core 21 in the first to third embodiments. Thereby, the stator in a state where the stator winding and the auxiliary iron core 40 are mounted on the stator iron core is assembled.

この時、補助鉄心４０の放熱部４２は、固定子鉄心の軸方向一端面上に、周方向に互いに接して円筒状に配列される。そして、円筒状に配列された放熱部４２の内周面は固定子巻線のコイルエンドの外径面に第２絶縁部材を介して接している。各切り欠き４３が固定子鉄心のティースと協働して径方向に延びる通風路を構成している。棒状鉄心部４１が第１絶縁部材を介して固定子巻線のスロット収納部に接している。
このように組み立てられた固定子は、放熱部４２がフロント側に位置するようにケースに組み付けられる。従って、この実施の形態４においても、上記実施の形態２と同様の効果を奏する。 At this time, the heat radiating portions 42 of the auxiliary iron core 40 are arranged in a cylindrical shape on the one axial end surface of the stator iron core in contact with each other in the circumferential direction. The inner peripheral surface of the heat radiating portion 42 arranged in a cylindrical shape is in contact with the outer diameter surface of the coil end of the stator winding via the second insulating member. Each notch 43 forms a ventilation path extending in the radial direction in cooperation with the teeth of the stator core. The rod-shaped iron core portion 41 is in contact with the slot accommodating portion of the stator winding through the first insulating member.
The stator assembled in this way is assembled to the case so that the heat radiation part 42 is located on the front side. Therefore, the fourth embodiment also has the same effect as the second embodiment.

この実施の形態４によれば、係止部４４が棒状鉄心部４１の他端に一体に形成されているので、補助鉄心４０の抜けが防止される。そこで、上記実施の形態２では、絶縁性樹脂を用いて補助鉄心３０の放熱部３２を固定子巻線２５のコイルエンド２５ｂに固着していたが、この実施の形態４では、補助鉄心４０を固着する手段が不要となり、固定子の組立性が向上される。
また、この実施の形態４では、直方体の積層鉄心１８を作製し、補助鉄心４０および固定子巻線を積層鉄心１８に装着した後、積層鉄心１８を円筒状に曲げ、円筒状に曲げられた積層鉄心１８の両端面を突き合わせて溶接している。そこで、上記実施の形態２におけるスロット収納部２５ａを径方向内方に押圧してスペースを形成し、補助鉄心３０の棒状鉄心部２７，３１を該スペースに挿入する作業が不要となり、固定子の組立性が向上される。 According to the fourth embodiment, the locking portion 44 is formed integrally with the other end of the rod-shaped iron core portion 41, so that the auxiliary iron core 40 is prevented from coming off. Therefore, in the second embodiment, the heat radiating portion 32 of the auxiliary iron core 30 is fixed to the coil end 25b of the stator winding 25 using an insulating resin. However, in the fourth embodiment, the auxiliary iron core 40 is attached to the coil end 25b. The means for fixing becomes unnecessary, and the assemblability of the stator is improved.
In the fourth embodiment, a rectangular parallelepiped laminated core 18 is manufactured, and after the auxiliary iron core 40 and the stator winding are mounted on the laminated iron core 18, the laminated iron core 18 is bent into a cylindrical shape and bent into a cylindrical shape. Both end surfaces of the laminated iron core 18 are butted and welded. Therefore, the slot housing portion 25a in the second embodiment is pressed inward in the radial direction to form a space, and the operation of inserting the rod-shaped core portions 27 and 31 of the auxiliary iron core 30 into the space becomes unnecessary. Assemblability is improved.

また、補助鉄心４０の他端に形成された幅広の係止部４４が放熱部として機能するので、固定子の冷却性が一層向上される。ここで、係止部４４の放熱面積を変えることで、固定子巻線で発生する熱の棒状鉄心部４１を介しての伝達方向と量を制御することができる。 Moreover, since the wide locking part 44 formed at the other end of the auxiliary iron core 40 functions as a heat radiating part, the cooling performance of the stator is further improved. Here, by changing the heat radiation area of the locking portion 44, the direction and amount of heat generated in the stator winding through the rod-shaped core portion 41 can be controlled.

実施の形態５．
図１０はこの発明の実施の形態５に係る固定子に適用される補助鉄心を示す斜視図である。 Embodiment 5 FIG.
FIG. 10 is a perspective view showing an auxiliary iron core applied to a stator according to Embodiment 5 of the present invention.

図１０において、補助鉄心４０Ａは、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部４１と、棒状鉄心部４１の一端に一体に形成された放熱部４５と、棒状鉄心部４１の他端に一体に形成された係止部４４とを備えている。放熱部４５は、１スロットピッチに相当する長さの幅、固定子巻線のコイルエンドの高さに相当する高さ、かつ棒状鉄心部４１の厚みに相当する厚みを有する円弧状板に作製され、棒状鉄心部４１の一端に、棒状鉄心部４１の幅方向一側に大きく延出するように形成されている。切り欠き４３が、放熱部４５の他端面の幅方向一端部を、放熱部４５の厚み方向全域に渡って除去して設けられている。放熱部４５の円弧状板の内周面の曲率は、固定子鉄心に巻装された固定子巻線のコイルエンドの外径面の曲率に一致している。 In FIG. 10, the auxiliary iron core 40 A is produced by compression-molding a pure iron-based powder that has been treated with an insulating coating, and has a rod-shaped iron core portion 41, a heat radiation portion 45 that is integrally formed at one end of the rod-shaped iron core portion 41, The other end of the iron core part 41 is provided with a locking part 44 formed integrally. The heat dissipating part 45 is formed as an arc-shaped plate having a width corresponding to the pitch of one slot, a height corresponding to the height of the coil end of the stator winding, and a thickness corresponding to the thickness of the rod-shaped core part 41. It is formed at one end of the rod-shaped core part 41 so as to extend greatly to one side in the width direction of the rod-shaped core part 41. A notch 43 is provided by removing one end in the width direction of the other end surface of the heat radiating portion 45 over the entire thickness direction of the heat radiating portion 45. The curvature of the inner peripheral surface of the arc-shaped plate of the heat radiating portion 45 coincides with the curvature of the outer diameter surface of the coil end of the stator winding wound around the stator core.

このように構成された補助鉄心４０Ａは、上記補助鉄心４０と同様に、固定子巻線とともに積層鉄心１８に装着され、積層鉄心１８を円筒状の曲げ、積層鉄心１８の両端面と突き合わせて溶接して、固定子鉄心に組み付けられる。
そして、補助鉄心４０Ａの放熱部４５は、固定子鉄心の軸方向一端面上に、周方向に互いに接して円筒状に配列される。そして、棒状鉄心部４１が第１絶縁部材を介して固定子巻線のスロット収納部に接し、放熱部４５の内周面は固定子巻線のコイルエンドの外径面に第２絶縁部材を介して接している。切り欠き４３が固定子鉄心のティースと協働して径方向に延びる通風路を構成している。さらに、係止部４４が固定子鉄心の軸方向他端面上に、１スロットピッチで周方向に配列されている。
このように組み立てられた固定子は、放熱部４５がフロント側に位置するようにケースに組み付けられる。
従って、この実施の形態５においても、上記実施の形態４と同様の効果が得られる。 The auxiliary iron core 40 A configured in this way is attached to the laminated iron core 18 together with the stator winding, like the auxiliary iron core 40, and the laminated iron core 18 is bent in a cylindrical shape and is brought into contact with both end faces of the laminated iron core 18 and welded. And assembled to the stator core.
The heat radiating portions 45 of the auxiliary iron core 40A are arranged in a cylindrical shape in contact with each other in the circumferential direction on one axial end surface of the stator iron core. The rod-shaped iron core portion 41 is in contact with the slot housing portion of the stator winding through the first insulating member, and the inner peripheral surface of the heat radiating portion 45 is connected to the outer diameter surface of the coil end of the stator winding. Is touching through. The notch 43 forms a ventilation path extending in the radial direction in cooperation with the teeth of the stator core. Further, the locking portions 44 are arranged in the circumferential direction at a one-slot pitch on the other axial end surface of the stator core.
The stator assembled in this way is assembled to the case so that the heat radiation part 45 is located on the front side.
Therefore, also in the fifth embodiment, the same effect as in the fourth embodiment can be obtained.

実施の形態６．
図１１はこの発明の実施の形態６に係る固定子に適用される補助鉄心を示す斜視図である。 Embodiment 6 FIG.
FIG. 11 is a perspective view showing an auxiliary iron core applied to a stator according to Embodiment 6 of the present invention.

図１１において、補助鉄心４０Ｂは、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部４１と、棒状鉄心部４１の一端に一体に形成された放熱部４２と、棒状鉄心部４１の他端に一体に形成された係止部４６とを備えている。係止部４６は、放熱部４２と同一形状に形成されている。つまり、補助鉄心４０Ｂを棒状鉄心部４１の長さ方向および幅方向の中心を厚み方向に通る軸周りに１８０°回転させた際に、係止部４６は回転前の放熱部４２に合致する外形形状に形成されている。 In FIG. 11, the auxiliary iron core 40 B is made by compression molding pure iron-based powder that has been subjected to an insulating coating treatment, and has a rod-shaped iron core portion 41, a heat radiation portion 42 integrally formed at one end of the rod-shaped iron core portion 41, and a rod-like shape. The other end of the iron core part 41 is provided with a locking part 46 formed integrally. The locking part 46 is formed in the same shape as the heat dissipation part 42. That is, when the auxiliary iron core 40B is rotated 180 ° around the axis passing through the center in the length direction and the width direction of the rod-shaped iron core portion 41 in the thickness direction, the locking portion 46 has an outer shape that matches the heat dissipation portion 42 before rotation. It is formed into a shape.

このように構成された補助鉄心４０Ｂは、上記補助鉄心４０と同様に、固定子巻線２５とともに積層鉄心１８に装着され、積層鉄心１８を円筒状の曲げ、積層鉄心１８の両端面と突き合わせて溶接して、固定子鉄心に組み付けられる。
そして、補助鉄心４０Ｂの放熱部４１が、固定子鉄心の軸方向一端面上に、周方向に互いに接して円筒状に配列され、係止部４６が、固定子鉄心の軸方向他端面上に、周方向に互いに接して円筒状に配列される。
このように組み立てられた固定子は、放熱部４２がフロント側に位置するようにケースに組み付けられる。 The auxiliary iron core 40 B configured as described above is mounted on the laminated iron core 18 together with the stator winding 25, and the laminated iron core 18 is cylindrically bent and abutted with both end faces of the laminated iron core 18 in the same manner as the auxiliary iron core 40. It is welded and assembled to the stator core.
And the heat radiating part 41 of the auxiliary iron core 40B is arranged in a cylindrical shape in contact with each other in the circumferential direction on one axial end surface of the stator core, and the locking part 46 is arranged on the other axial end surface of the stator core. Are arranged in a cylindrical shape in contact with each other in the circumferential direction.
The stator assembled in this way is assembled to the case so that the heat radiation part 42 is located on the front side.

従って、この実施の形態６においても、抜け防止に関しては上記実施の形態４と同様の、固定子の冷却性と磁気抵抗の低減に関しては上記実施の形態１と同様の効果が得られる。
この実施の形態６によれば、係止部４６が放熱部４２と同形状に形成されているので、固定子巻線での発熱が固定子鉄心のフロント側およびリヤ側から均等に放熱される。
係止部４６が互いに接して周方向に配列された円筒体に構成されているので、コアバックの補助磁路が固定子鉄心のリヤ側にも形成され、固定子の全磁路における磁気抵抗が一層小さくなる。
係止部４６が放熱部４２と同じ形状に形成されているので、補助鉄心４０Ｂの向きに関わらず積層鉄心１８に装着でき、固定子の組立性が向上される。 Therefore, also in the sixth embodiment, the same effects as those of the first embodiment can be obtained with respect to the prevention of disconnection, as with the fourth embodiment, and the cooling performance and the magnetic resistance of the stator.
According to the sixth embodiment, since the locking portion 46 is formed in the same shape as the heat radiating portion 42, the heat generated in the stator winding is evenly radiated from the front side and the rear side of the stator core. .
Since the engaging portions 46 are formed in cylindrical bodies arranged in contact with each other in the circumferential direction, an auxiliary magnetic path for the core back is also formed on the rear side of the stator core, and the magnetoresistance in all the magnetic paths of the stator Becomes even smaller.
Since the locking portion 46 is formed in the same shape as the heat radiating portion 42, it can be mounted on the laminated core 18 regardless of the orientation of the auxiliary iron core 40 B, and the assemblability of the stator is improved.

実施の形態７．
図１２はこの発明の実施の形態７に係る固定子に適用される補助鉄心を示す斜視図である。 Embodiment 7 FIG.
FIG. 12 is a perspective view showing an auxiliary iron core applied to a stator according to Embodiment 7 of the present invention.

図１２において、補助鉄心４０Ｃは、絶縁被膜処理された純鉄系粉末を圧縮成型して作製され、棒状鉄心部４１と、棒状鉄心部４１の一端に一体に形成された放熱部４５と、棒状鉄心部４１の他端に一体に形成された係止部４７とを備えている。係止部４７は、放熱部４５と同一形状に形成されている。つまり、補助鉄心４０Ｃを棒状鉄心部４１の長さ方向および幅方向の中心を厚み方向に通る軸周りに１８０°回転させた際に、係止部４７は回転前の放熱部４５に合致する外形形状に形成されている。 In FIG. 12, the auxiliary iron core 40 C is produced by compression-molding a pure iron-based powder that has been subjected to an insulating coating, and has a rod-shaped iron core portion 41, a heat radiation portion 45 integrally formed at one end of the rod-shaped iron core portion 41, The other end of the iron core part 41 is provided with a locking part 47 formed integrally. The locking portion 47 is formed in the same shape as the heat radiating portion 45. That is, when the auxiliary iron core 40C is rotated 180 ° around the axis passing through the center in the length direction and the width direction of the rod-shaped iron core portion 41 in the thickness direction, the locking portion 47 has an outer shape that matches the heat radiating portion 45 before rotation. It is formed into a shape.

このように構成された補助鉄心４０Ｃは、上記補助鉄心４０Ａと同様に、固定子巻線とともに積層鉄心１８に装着され、積層鉄心１８を円筒状の曲げ、積層鉄心１８の両端面と突き合わせて溶接して、固定子鉄心に組み付けられる。
そして、補助鉄心４０Ｃの放熱部４５が、固定子鉄心の軸方向一端面上に、周方向に互いに接して円筒状に配列され、係止部４７が、固定子鉄心の軸方向他端面上に、周方向に互いに接して円筒状に配列される。
このように組み立てられた固定子は、放熱部４５がフロント側に位置するようにケースに組み付けられる。 The auxiliary iron core 40C configured as described above is attached to the laminated iron core 18 together with the stator winding, similarly to the auxiliary iron core 40A, and the laminated iron core 18 is bent in a cylindrical shape and is brought into contact with both end faces of the laminated iron core 18 for welding. And assembled to the stator core.
The heat radiating portion 45 of the auxiliary iron core 40C is arranged in a cylindrical shape in contact with each other in the circumferential direction on one axial end surface of the stator core, and the locking portion 47 is arranged on the other axial end surface of the stator core. Are arranged in a cylindrical shape in contact with each other in the circumferential direction.
The stator assembled in this way is assembled to the case so that the heat radiation part 45 is located on the front side.

従って、この実施の形態７においても、上記実施の形態６と同様の効果が得られる。
この実施の形態７によれば、係止部４７が放熱部４５と同形状に形成されているので、固定子巻線での発熱が固定子鉄心のフロント側およびリヤ側から均等に放熱される。
係止部４７が互いに接して周方向に配列された円筒体に構成されているので、コアバックの補助磁路が固定子鉄心のリヤ側にも形成され、固定子の全磁路における磁気抵抗が一層小さくなる。
係止部４７が放熱部４５と同じ形状に形成されているので、補助鉄心４０Ｃの向きに関わらず積層鉄心１８に装着でき、固定子の組立性が向上される。 Therefore, also in the seventh embodiment, the same effect as in the sixth embodiment can be obtained.
According to the seventh embodiment, since the locking portion 47 is formed in the same shape as the heat radiating portion 45, the heat generated in the stator winding is evenly radiated from the front side and the rear side of the stator core. .
Since the engaging portions 47 are formed in cylindrical bodies that are in contact with each other and arranged in the circumferential direction, an auxiliary magnetic path for the core back is also formed on the rear side of the stator core, and the magnetoresistance in all the magnetic paths of the stator Becomes even smaller.
Since the engaging portion 47 is formed in the same shape as the heat radiating portion 45, it can be attached to the laminated iron core 18 regardless of the orientation of the auxiliary iron core 40C, and the assembly of the stator is improved.

なお、上記各実施の形態では、車両用交流発電機の固定子に適用するものとして説明しているが、この発明は、車両用交流発電機に限らず、車両用電動機や車両用発電電動機などの回転電機の固定子に適用しても、同様の効果を奏する。
また、上記各実施の形態では、補助鉄心が絶縁被膜処理された純鉄系粉末を圧縮成型して作製されているものとしているが、金属磁性粉末は純鉄系粉末に限定されるものではなく、例えばＮｉ或いはＭｏパーマロイ粉末、Ｆｅ−Ｓｉ−Ａｌ系粉末、Ｆｅ−Ｓｉ系粉末、Ｆｅ系アモルファス粉末などを用いることができる。また、金属磁性粉末の絶縁被膜処理には、例えばリン酸塩系、ＭｇＯなどの絶縁材料が用いられる。
また、上記各実施の形態では、異なる形状の補助鉄心を用いているが、補助鉄心の形状はこれらの形状に限定されるものではなく、棒状鉄心部がスロット内に収納され、かつ放熱部が互いに接して周方向に円筒状に配列されるものであればよい。 In each of the above-described embodiments, description is made assuming that the present invention is applied to a stator of a vehicle alternator. However, the present invention is not limited to a vehicle alternator, and includes a vehicle motor, a vehicle generator motor, and the like. Even when applied to the stator of a rotating electric machine, the same effect is obtained.
In each of the above embodiments, the auxiliary iron core is manufactured by compression molding a pure iron-based powder that has been treated with an insulating coating, but the metal magnetic powder is not limited to the pure iron-based powder. For example, Ni or Mo permalloy powder, Fe—Si—Al powder, Fe—Si powder, Fe amorphous powder, etc. can be used. In addition, for the insulating coating treatment of the metal magnetic powder, for example, an insulating material such as phosphate or MgO is used.
Moreover, in each said embodiment, although the auxiliary iron core of a different shape is used, the shape of an auxiliary iron core is not limited to these shapes, A rod-shaped iron core part is accommodated in a slot, and a heat radiating part is provided. What is necessary is just to be arranged in a cylindrical shape in the circumferential direction in contact with each other.

この発明の実施の形態１に係る固定子が実装された車両用交流発電機を模式的に示す断面図である。It is sectional drawing which shows typically the vehicle AC generator by which the stator which concerns on Embodiment 1 of this invention was mounted. この発明の実施の形態１に係る補助鉄心が装着された固定子鉄心の要部を示す斜視図である。It is a perspective view which shows the principal part of the stator core with which the auxiliary iron core which concerns on Embodiment 1 of this invention was mounted | worn. この発明の実施の形態１に係る補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core which concerns on Embodiment 1 of this invention. この発明の実施の形態１に係る固定子鉄心の製造方法を説明する平面図である。It is a top view explaining the manufacturing method of the stator core which concerns on Embodiment 1 of this invention. この発明の実施の形態２に係る固定子における補助鉄心が装着された固定子鉄心の要部を示す斜視図である。It is a perspective view which shows the principal part of the stator core with which the auxiliary iron core in the stator which concerns on Embodiment 2 of this invention was mounted | worn. この発明の実施の形態２に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 2 of this invention. この発明の実施の形態３に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 3 of this invention. この発明の実施の形態４に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 4 of this invention. この発明の実施の形態４に係る固定子における固定子鉄心を作製する方法を説明する要部斜視図である。It is a principal part perspective view explaining the method to produce the stator core in the stator which concerns on Embodiment 4 of this invention. この発明の実施の形態５に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 5 of this invention. この発明の実施の形態６に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 6 of this invention. この発明の実施の形態７に係る固定子に適用される補助鉄心を示す斜視図である。It is a perspective view which shows the auxiliary iron core applied to the stator which concerns on Embodiment 7 of this invention.

Explanation of symbols

２フロント側ブラケット（第１ブラケット）、３リヤ側ブラケット（第２ブラケット）、５シャフト、６回転子、１０ファン（送風手段）、１５磁性鋼板、１６第１絶縁性部材、１７第２絶縁性部材、２０固定子、２１固定子鉄心、２４スロット、２５固定子巻線、２５ａスロット収納部、２５ｂコイルエンド、２６補助鉄心、２７棒状鉄心部、２８放熱部、２９切り欠き（通風路）、３０，３０Ａ補助鉄心、３１棒状鉄心部、３２，３４放熱部、３３，３５切り欠き（通風路）、４０，４０Ａ，４０Ｂ，４０Ｃ補助鉄心、４１棒状鉄心部、４２，４５放熱部、４３切り欠き（通風路）、４４，４６，４７係止部。 2 front bracket (first bracket), 3 rear bracket (second bracket), 5 shaft, 6 rotor, 10 fan (air blowing means), 15 magnetic steel plate, 16 first insulating member, 17 second insulating property Member, 20 Stator, 21 Stator core, 24 slots, 25 Stator winding, 25a Slot housing part, 25b Coil end, 26 Auxiliary core, 27 Bar-shaped core part, 28 Heat radiation part, 29 Notch (ventilation path), 30, 30A Auxiliary iron core, 31 Bar-shaped iron core, 32, 34 Heat sink, 33, 35 Notch (ventilation path), 40, 40A, 40B, 40C Auxiliary iron core, 41 Bar-shaped iron core, 42, 45 Heat sink, 43 Cut Notch (ventilation path), 44, 46, 47 Locking part.

Claims

A first bracket and a second bracket, each of which is shaped like a bowl and disposed with the openings facing each other;
A rotor fixed to a shaft rotatably supported at axial positions of the first and second brackets, and disposed in the first and second brackets;
The rotor is manufactured by laminating magnetic steel plates, the slots are opened on the inner peripheral side and arranged in the circumferential direction, and both axial ends are pressed and held between the opening edges of the first and second brackets. And a coil end that connects between the slot storage portion and the end of the slot storage portion, and the slot storage portion is stored in the slot. A stator having a stator winding wound around the stator core;
A rotating electrical machine comprising: air blowing means that cools the stator windings by blowing cooling air into the first and second brackets in conjunction with rotation of the rotor;
The stator is inserted into a space formed between the bottom of the slot and the slot housing portion, and is in contact with the slot housing portion via a first insulating member, and the stator core Provided with at least one axial end and on the radially outer side of the coil end in contact with each other along the coil end and arranged in a cylindrical shape in the circumferential direction to form an auxiliary magnetic path ,
The rotating electric machine according to claim 1, wherein the corresponding heat dissipating part and the rod-shaped iron core part are integrally formed by compression molding metal magnetic powder that has been subjected to an insulating coating.

A first bracket and a second bracket, each of which is shaped like a bowl and disposed with the openings facing each other;
A rotor fixed to a shaft rotatably supported at axial positions of the first and second brackets, and disposed in the first and second brackets;
The rotor is manufactured by laminating magnetic steel plates, the slots are opened on the inner peripheral side and arranged in the circumferential direction, and both axial ends are pressed and held between the opening edges of the first and second brackets. And a coil end that connects between the slot storage portion and the end of the slot storage portion, and the slot storage portion is stored in the slot. A stator having a stator winding wound around the stator core;
A rotating electrical machine comprising: air blowing means that cools the stator windings by blowing cooling air into the first and second brackets in conjunction with rotation of the rotor;
The stator is inserted into a space formed between the bottom of the slot and the slot housing portion, and is in contact with the slot housing portion via a first insulating member, and the stator core A plurality of heat dissipating portions arranged in a cylindrical shape in the circumferential direction in contact with each other along the coil end, on at least one axial end portion and radially outside the coil end;
The corresponding heat radiating portion and the rod-shaped iron core portion are integrally formed by compression molding metal magnetic powder that has been treated with an insulating coating,
A rotating electrical machine characterized in that an air passage is formed in a radial direction through a portion of the heat dissipating part facing the axial end of the stator core .

The rotating electrical machine according to claim 1 or 2, wherein the heat radiating portion is in contact with the coil end via a second insulating member.

The rotating electrical machine according to any one of claims 1 to 3, wherein the heat dissipating part is in contact with inner wall surfaces of the first and second brackets facing the heat dissipating part.

The rod-shaped iron core portion is formed such that an end opposite to the heat radiating portion extends from the slot, and an extension portion of the rod-shaped iron core portion from the slot is formed wider than the width of the slot. The rotating electrical machine according to any one of claims 1 to 4, wherein the rotating electrical machine is provided.

6. The rotating electrical machine according to claim 1, wherein the metal magnetic powder is a pure iron-based powder.