JP2016146715A - Squirrel-cage rotary electric machine and rotor thereof, and rotor manufacturing method - Google Patents

Squirrel-cage rotary electric machine and rotor thereof, and rotor manufacturing method Download PDF

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JP2016146715A
JP2016146715A JP2015023257A JP2015023257A JP2016146715A JP 2016146715 A JP2016146715 A JP 2016146715A JP 2015023257 A JP2015023257 A JP 2015023257A JP 2015023257 A JP2015023257 A JP 2015023257A JP 2016146715 A JP2016146715 A JP 2016146715A
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rotor
axial
rotor core
axial direction
hole
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JP2016146715A5 (en
JP6383677B2 (en
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直 若杉
Nao Wakasugi
直 若杉
真琴 松下
Makoto Matsushita
真琴 松下
大輔 三須
Daisuke Misu
大輔 三須
活徳 竹内
Katsunori Takeuchi
活徳 竹内
寿郎 長谷部
Toshiro Hasebe
寿郎 長谷部
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Toshiba Corp
Toshiba Mitsubishi Electric Industrial Systems Corp
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Toshiba Corp
Toshiba Mitsubishi Electric Industrial Systems Corp
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Priority to CN201580075748.0A priority patent/CN107251383B/en
Priority to PCT/JP2015/003801 priority patent/WO2016129017A1/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Induction Machinery (AREA)
  • Manufacture Of Motors, Generators (AREA)

Abstract

PROBLEM TO BE SOLVED: To improve the efficiency of a squirrel-cage rotary electric machine having a rotor bar.SOLUTION: A squirrel-cage rotary electric machine has a rotor and a stator. The rotor has: a rotor shaft; a rotor core 12, fixed to the rotor shaft, which is provided with axial through-holes spaced apart from each other in the circumferential direction; a plurality of rotor bars 13 which is arranged to fill a space located in the vicinity of a surface in the radial direction of the rotor core 12 and inside the axial through-holes 50 with their radial tips 50b left unfilled, and which has ends on both sides, except the rotor core, electrically coupled to each other; and two annular short-circuit rings, arranged outside of both sides in the axial direction of the rotor core 12, which are electrically coupled to both ends of the plurality of rotor bars 13. The stator has a stator core and a stator coil.SELECTED DRAWING: Figure 2

Description

本発明は、かご型回転電機およびその回転子、ならびに回転子の製造方法に関する。   The present invention relates to a squirrel-cage electric rotating machine, its rotor, and a method for manufacturing the rotor.

かご型回転電機のうち、特に小容量のものについては、アルミダイキャストにより製造したものが多く用いられている。アルミダイキャストは、回転子バーが設けられる部分を空洞として、この空洞にアルミニウムを注入し鋳造によって、アルミニウム製のかごを形成する方法である。この際、通常、短絡環も一体で鋳造される。   Of the cage-type rotating electrical machines, especially those having a small capacity are often manufactured by aluminum die casting. Aluminum die casting is a method in which a portion where a rotor bar is provided is a cavity, aluminum is poured into the cavity, and an aluminum cage is formed by casting. At this time, usually, the short-circuit ring is also integrally cast.

また、回転子鉄心のかご型巻線用の孔およびエンドリング成形金型内に銅製の微粉末をそれぞれ加圧充填して燒結することによりかご型巻線とエンドリングを一体で形成する技術が知られている（特許文献１）。   In addition, there is a technology for integrally forming the cage winding and end ring by pressurizing and filling copper fine powder into the hole for the rotor core cage winding and the end ring molding die. Known (Patent Document 1).

特開平８−６５９３４号公報JP-A-8-65934

回転子バーのブリッジ部すなわち、回転子バーの径方向外側端部と回転子鉄心の径方向外側との間の部分の径方向の幅を狭めることによって漏れインダクタンスが低減される。したがって、この間隔をできるだけ狭めることによって励磁電流を低減し、効率の向上を図っている。   Leakage inductance is reduced by reducing the radial width of the bridge portion of the rotor bar, that is, the portion between the radially outer end of the rotor bar and the radially outer end of the rotor core. Therefore, the excitation current is reduced by narrowing this interval as much as possible to improve the efficiency.

一方、ロータ表面の周方向にこの回転子バーの領域が広がることによって回転子バーと鎖交する高調波磁束が増加する。高調波磁束によって渦電流が流れ、高調波２次銅損が増加する。この結果、全体としての効率改善効果が低減してしまう。   On the other hand, when the area of the rotor bar expands in the circumferential direction of the rotor surface, the harmonic magnetic flux interlinking with the rotor bar increases. Eddy current flows due to the harmonic magnetic flux, and the harmonic secondary copper loss increases. As a result, the efficiency improvement effect as a whole is reduced.

そこで、本発明は、回転子バーを有するかご型回転電機の効率の向上を図ることを目的とする。   Accordingly, an object of the present invention is to improve the efficiency of a cage rotating electric machine having a rotor bar.

上述の目的を達成するため、本発明に係るかご型回転電機は、回転可能に軸支されて回転軸中心で軸方向に延びるロータシャフトと、前記ロータシャフトに固定されて、周方向に互いに間隔をあけて軸方向貫通孔が形成され前記軸方向に延びる回転子鉄心と、前記回転子鉄心の径方向表面近傍であって前記軸方向に延びて前記軸方向貫通孔内に当該軸方向貫通孔の径方向先端部を残した空間を満たすように設けられ、前記回転子鉄心外の両側の端部は互いに電気的に結合している複数の回転子バーと、前記回転子鉄心の前記軸方向の両側の外部にあって前記複数の回転子バーの端部のいずれとも電気的に結合する２つの環状の短絡環と、を有する回転子と、前記回転子鉄心の外周に前記回転子鉄心と間隔をあけて配設されて互いに周方向に間隔をあけて配列されて前記軸方向に延びて半径方向の内側に向かって突出する複数のティースが形成された固定子鉄心と、前記複数のティースに巻回された固定子コイルと、を有する固定子と、を備えることを特徴とする。   In order to achieve the above-described object, a squirrel-cage rotating electrical machine according to the present invention includes a rotor shaft that is rotatably supported and extends in the axial direction about the rotation axis, and is fixed to the rotor shaft and spaced apart from each other in the circumferential direction. A rotor core that is formed with an axial through hole and extends in the axial direction, and that extends in the axial direction near the radial surface of the rotor core and extends in the axial through hole. A plurality of rotor bars that are provided so as to fill a space that leaves a tip portion in the radial direction, and ends on both sides outside the rotor core are electrically coupled to each other, and the axial direction of the rotor core A rotor having two annular short-circuit rings that are electrically connected to any one of the ends of the plurality of rotor bars, and the rotor core on the outer periphery of the rotor core. Spaced apart and circumferentially spaced from each other A stator core having a plurality of teeth that are arranged with gaps extending in the axial direction and projecting radially inward, and a stator coil wound around the plurality of teeth. And a child.

また、本発明に係るかご型回転電機の回転子は、回転可能に軸支されて回転軸中心で軸方向に延びるロータシャフトと、前記ロータシャフトに固定されて、周方向に互いに間隔をあけて軸方向貫通孔が形成され前記軸方向に延びる回転子鉄心と、前記回転子鉄心の径方向表面近傍であって前記軸方向に延びて前記軸方向貫通孔内に当該軸方向貫通孔の径方向先端部を残した空間を満たすように設けられ、前記回転子鉄心外の両側の端部は互いに電気的に結合している複数の回転子バーと、前記回転子鉄心の前記軸方向の両側の外部にあって前記複数の回転子バーの端部のいずれとも電気的に結合する２つの環状の短絡環と、を有することを特徴とする。   Further, the rotor of the squirrel-cage electric machine according to the present invention includes a rotor shaft that is rotatably supported and extends in the axial direction about the rotation axis, and is fixed to the rotor shaft and spaced apart from each other in the circumferential direction. A rotor core formed with an axial through-hole and extending in the axial direction, and a radial direction of the axial through-hole in the axial through-hole in the vicinity of the radial surface of the rotor core and extending in the axial direction A plurality of rotor bars provided on both sides of the rotor core are provided so as to fill a space leaving the tip, and the ends on both sides outside the rotor core are electrically coupled to each other, and on both sides in the axial direction of the rotor core. And two annular short-circuit rings that are external and electrically coupled to any of the ends of the plurality of rotor bars.

また、本発明は、かご型回転電機の回転子の製造方法であって、回転子鉄心に形成された軸方向貫通孔の径方向先端部に軸方向に延びた先端部挿入部材を設定する先端部挿入部材設定ステップと、前記先端部挿入部材設定ステップの後に、前記軸方向貫通孔が形成され前記先端部挿入部材が設定された前記回転子鉄心と端部の鋳型とを組み立て一体化した鋳型を形成する鋳型組立てステップと、前記鋳型組立てステップの後に、前記一体化した鋳型に回転子バー用の熔解した金属を流し込む充填ステップと、前記一体化した鋳型から、前記回転子鉄心と短絡環部分の鋳型を取り外す鋳型解体ステップと、を有することを特徴とする。   The present invention also relates to a method of manufacturing a rotor of a squirrel-cage electric machine, wherein a tip end insertion member extending in the axial direction is set at a radial tip portion of an axial through hole formed in the rotor core. A mold obtained by assembling and integrating the rotor iron core in which the axial through-hole is formed and the tip insertion member is set, and the mold at the end after the part insertion member setting step and the tip insertion member setting step A mold assembling step, a filling step of pouring molten metal for a rotor bar into the integrated mold after the mold assembling step, and the rotor core and the short-circuited ring portion from the integrated mold. And a mold dismantling step for removing the mold.

本発明によれば、回転子バーを有するかご型回転電機の効率の向上を図ることができる。   ADVANTAGE OF THE INVENTION According to this invention, the improvement of the efficiency of the cage type rotary electric machine which has a rotor bar can be aimed at.

実施形態に係るかご型回転電機の構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the structure of the cage type rotary electric machine which concerns on embodiment. 図１のＩＩ−ＩＩ線矢視横部分断面図である。FIG. 2 is a horizontal partial cross-sectional view taken along line II-II in FIG. 1. 実施形態に係る回転子製造方法の手順を示すフロー図である。It is a flowchart which shows the procedure of the rotor manufacturing method which concerns on embodiment. 実施形態に係るかご型回転電機と従来のかご型回転電機のそれぞれの周波数ごとのジュール損失を比較したグラフである。It is the graph which compared the Joule loss for every frequency of the cage type rotary electric machine which concerns on embodiment, and the conventional cage type rotary electric machine. 実施形態に係るかご型回転電機と従来のかご型回転電機のそれぞれの合計のジュール損失を比較したグラフである。It is the graph which compared each total joule loss of the cage type rotary electric machine which concerns on embodiment, and the conventional cage type rotary electric machine.

以下、図面を参照して、本発明の実施形態に係るかご型回転電機について説明する。   Hereinafter, a squirrel-cage electric rotating machine according to an embodiment of the present invention will be described with reference to the drawings.

図１は、実施形態に係るかご型回転電機の構成を示す縦断面図である。かご型回転電機１００は、回転子１０、固定子２０、軸受３１およびフレーム３２を有する。   FIG. 1 is a longitudinal sectional view showing a configuration of a squirrel-cage electric rotating machine according to an embodiment. The cage rotating electric machine 100 includes a rotor 10, a stator 20, a bearing 31 and a frame 32.

回転子１０は、ロータシャフト１１、回転子鉄心１２、回転子バー１３、短絡環（エンドリング）１４、エンドリングファン１５を有する。ロータシャフト１１は、軸まわりを回転可能に軸支され、軸方向に延びている。回転子鉄心１２は、中央にロータシャフト１１を貫通させる中心開口が形成され、たとえば強磁性体のケイ素鋼鋼板を軸方向に積層した円筒形状である。また、回転子鉄心１２には、中心開口の径方向外側であって回転子鉄心１２の径方向外側近傍に周方向に互いに間隔をあけて軸方向貫通孔５０（図２）が形成されている。   The rotor 10 includes a rotor shaft 11, a rotor core 12, a rotor bar 13, a short-circuit ring (end ring) 14, and an end ring fan 15. The rotor shaft 11 is rotatably supported around the axis and extends in the axial direction. The rotor core 12 has a central opening formed through the rotor shaft 11 in the center, and has a cylindrical shape in which, for example, ferromagnetic silicon steel plates are laminated in the axial direction. Further, the rotor core 12 is formed with axial through holes 50 (FIG. 2) spaced from each other in the circumferential direction in the radial outside of the central opening and in the vicinity of the radially outer side of the rotor core 12. .

回転子バー１３は、導電体であり、回転子鉄心１２に形成された軸方向貫通孔５０のそれぞれに設けられている。短絡環１４は、回転子鉄心１２の軸方向の両端から突出する回転子バー１３同士を電気的に接続する環状の導電体である。   The rotor bar 13 is a conductor and is provided in each of the axial through holes 50 formed in the rotor core 12. The short-circuit ring 14 is an annular conductor that electrically connects the rotor bars 13 protruding from both axial ends of the rotor core 12.

固定子２０は、固定子鉄心２１および固定子コイル２２を有する。固定子鉄心２１は、主に強磁性体材料製であり、回転子鉄心１２の径方向外側に設けられ、間隙をあけて回転子鉄心１２に対向している。固定子コイル２２は、固定子鉄心２１に形成され軸方向に延びた図示しないスロット内に収納された導体と固定子鉄心２１外の接続部を有する。   The stator 20 has a stator core 21 and a stator coil 22. The stator core 21 is mainly made of a ferromagnetic material, is provided on the radially outer side of the rotor core 12, and faces the rotor core 12 with a gap. The stator coil 22 includes a conductor housed in a slot (not shown) formed in the stator core 21 and extending in the axial direction, and a connection portion outside the stator core 21.

フレーム３２は、回転子鉄心１２、および固定子２０を収納する。軸受３１は、ロータシャフト１１の軸方向の両側を回転可能に軸支する。軸受３１は、フレーム３２により静止固定されている。   The frame 32 accommodates the rotor core 12 and the stator 20. The bearing 31 rotatably supports both axial sides of the rotor shaft 11. The bearing 31 is stationary and fixed by a frame 32.

エンドリングファン１５は、短絡環１４と一体に成形されたファンであり、フレーム３２内の冷却用気体を撹拌する。フレーム３２内で生じた熱は、エンドリングファン１５により撹拌された冷却用気体によりフレーム３２に至り、フレーム３２外の外扇３５により駆動され外気に放出される。   The end ring fan 15 is a fan formed integrally with the short-circuit ring 14, and agitates the cooling gas in the frame 32. The heat generated in the frame 32 reaches the frame 32 by the cooling gas stirred by the end ring fan 15 and is driven by the external fan 35 outside the frame 32 to be released to the outside air.

図２は、図１のＩＩ−ＩＩ線矢視横部分断面図である。回転子鉄心１２に形成された軸方向貫通孔５０は、径方向に延びた段付きでほぼ長方形の断面形状の矩形部分５０ａおよび径方向先端の径方向先端部５０ｂを有する。径方向先端部５０ｂは、周方向の中央において回転子鉄心１２の外周との距離が最も小さく、ほぼ径方向外側に頂点を有する三角形の断面形状である。なお、径方向先端部５０ｂを中心にした形状は三角形には限定されない。回転子鉄心１２内の漏れ磁束をできるだけ制限するために径方向外周との間隔を極力小さくすることと、この部分の回転子鉄心の構造強度を確保することの両者を考慮して設定すればよい。したがって、この両方の目的が達成できれば、たとえば、この部分の断面形状は円弧を有する形状でもよい。   2 is a horizontal partial cross-sectional view taken along the line II-II in FIG. The axial through-hole 50 formed in the rotor core 12 has a stepped portion extending in the radial direction and a rectangular portion 50a having a substantially rectangular cross-sectional shape and a radial tip portion 50b at the radial tip. The radial front end portion 50b has a triangular cross-sectional shape that has the smallest distance from the outer periphery of the rotor core 12 at the center in the circumferential direction and has a vertex substantially on the outside in the radial direction. In addition, the shape centering on the radial direction front-end | tip part 50b is not limited to a triangle. In order to limit the leakage magnetic flux in the rotor core 12 as much as possible, the distance from the outer periphery in the radial direction should be set as small as possible and the structural strength of the rotor core in this portion should be ensured. . Therefore, if both of these objectives can be achieved, for example, the cross-sectional shape of this portion may be a shape having an arc.

矩形部分５０ａには、回転子バー１３が収納されている。具体的には、矩形部分５０ａを鋳型として導電性のある金属が鋳造により充填されている。また、径方向先端部５０ｂには、非導電性かつ非磁性体である先端部挿入部材５１が設けられている。回転子バー１３の鋳造の際は、先端部挿入部材５１を径方向先端部５０ｂに取り付けた状態で行う。   The rotor bar 13 is accommodated in the rectangular portion 50a. Specifically, a conductive metal is filled by casting using the rectangular portion 50a as a mold. Further, the distal end portion 50b is provided with a distal end insertion member 51 that is non-conductive and non-magnetic. When the rotor bar 13 is cast, the tip insertion member 51 is attached to the radial tip 50b.

鋳造の際は、回転子バー１３の回転子鉄心１２外の部分、短絡環１４およびエンドリングファン１５などの端部の鋳型を回転子鉄心１２と接合させて、回転子鉄心１２内の回転子バー１３、短絡環１４およびエンドリングファン１５を一体で行う。   At the time of casting, a portion of the rotor bar 13 outside the rotor core 12, a mold at an end such as the short ring 14 and the end ring fan 15 is joined to the rotor core 12, and the rotor in the rotor core 12 is joined. The bar 13, the short ring 14 and the end ring fan 15 are integrated.

なお、回転子バー１３は、鋳造によるものに限定されない。すなわち、矩形部分５０ａの形状に合わせた断面形状を有する導電性金属の棒を矩形部分に挿入することにより組み立ててもよい。この場合は、先端部分に先端部挿入部材５１を取り付けずに、空間のままとしてもよい。   In addition, the rotor bar 13 is not limited to that by casting. That is, you may assemble by inserting the conductive metal stick | rod which has the cross-sectional shape matched with the shape of the rectangular part 50a in a rectangular part. In this case, the space may be left without attaching the distal end portion insertion member 51 to the distal end portion.

図３は、回転子製造方法の手順を示すフロー図である。まず、回転子鉄心１２の軸方向貫通孔５０の径方向外側に向かっての先端の部分である径方向先端部５０ｂに先端部挿入部材５１を配置する（ステップＳ０１）。次に、径方向先端部５０ｂに先端部挿入部材５１が配置され、回転子バー１３形成用の空洞部分が形成された回転子鉄心１２と、両方の端部の鋳型、すなわち短絡環１４およびエンドリングファン１５の鋳型とを組み立てる（ステップＳ０２）。   FIG. 3 is a flowchart showing the procedure of the rotor manufacturing method. First, the distal end insertion member 51 is disposed at the radial distal end portion 50b that is the distal end portion of the rotor core 12 toward the radially outer side of the axial through hole 50 (step S01). Next, the distal end insertion member 51 is disposed at the radial distal end portion 50b, and the rotor core 12 in which the cavity for forming the rotor bar 13 is formed, and the molds at both ends, that is, the short-circuit ring 14 and the end The mold of the ring fan 15 is assembled (step S02).

次に、回転子鉄心１２の軸方向貫通孔５０の矩形部分５０ａおよび両端部の鋳型に、導体バー用金属を流し込む（ステップＳ０３）。この結果、端部に短絡環１４およびエンドリングファン１５が形成されるとともに、回転子鉄心１２の軸方向貫通孔５０内は径方向先端部５０ｂが設けられている部分を除く空間が導体バー用金属で満たされる。ここで、導体バー用金属は導電滞在量であり、たとえばアルミニウムである。あるいは、銅でもよい。所定の時間経過後に、両端の鋳型を取り外し、鋳造部分の表面仕上げを行う（ステップＳ０４）。次に、回転子１０以外の部分の製作およびかご型回転電機への組み立てを行う（ステップＳ０５）。   Next, the conductor bar metal is poured into the rectangular portion 50a of the axial through hole 50 of the rotor core 12 and the molds at both ends (step S03). As a result, the short-circuit ring 14 and the end ring fan 15 are formed at the end, and the space other than the portion where the radial tip 50b is provided in the axial through hole 50 of the rotor core 12 is for the conductor bar. Filled with metal. Here, the conductor bar metal is the amount of stay in the conductive material, for example, aluminum. Alternatively, copper may be used. After a predetermined time has elapsed, the molds at both ends are removed, and the surface of the cast part is finished (step S04). Next, parts other than the rotor 10 are manufactured and assembled into a squirrel-cage rotating electric machine (step S05).

従来は、回転子バーのブリッジ、すなわち回転子バーの先端から回転子鉄心の径方向外側表面までの距離を小さくすることにより、この部分を通過する磁力線を制限して漏れインダクタンスを低減していた。一方、ロータ表面近傍に回転子バーの領域が広がることは、高調波磁束が多く鎖交することになり、これによって渦電流が流れ高調波の２次銅損が増加してしまう。この結果、トータルとしての効率改善効果が薄かった。   Conventionally, by reducing the distance from the bridge of the rotor bar, that is, from the tip of the rotor bar to the radially outer surface of the rotor core, the magnetic field lines passing through this portion are limited to reduce the leakage inductance. . On the other hand, when the rotor bar region is expanded in the vicinity of the rotor surface, a large amount of harmonic magnetic flux is interlinked, thereby causing an eddy current to flow and increasing the secondary copper loss of the harmonic. As a result, the efficiency improvement effect as a whole was weak.

本実施形態においては、軸方向貫通孔５０の径方向先端部５０ｂに非磁性かつ非導電性の先端部挿入部材５１を設けることによって、ロータ表面近傍に回転子バー１３の領域が広がることを抑制している。また、漏れ磁束の通過する径方向先端部５０ｂは先端部挿入部材５１から回転子鉄心１２の径方向外側表面までの距離を制限している。この結果、トータルとしての効率の改善を図ることができる。   In this embodiment, the nonmagnetic and nonconductive tip insertion member 51 is provided at the radial tip 50b of the axial through hole 50, thereby suppressing the area of the rotor bar 13 from spreading near the rotor surface. doing. Further, the radial tip 50b through which the leakage magnetic flux passes restricts the distance from the tip insertion member 51 to the radially outer surface of the rotor core 12. As a result, the total efficiency can be improved.

図４は、実施形態に係るかご型回転電機と従来のかご型回転電機のそれぞれの周波数ごとのジュール損失を比較したグラフである。横軸は、周波数の次数である。次数が１は基本周波数すなわち電源周波数である。縦軸は、解析結果による損失であり、単位はジュール（Ｊ）である。それぞれの次数において、左は従来型試作機のジュール損失、右は改良機のジュール損失である。   FIG. 4 is a graph comparing Joule losses for each frequency of the car-type rotating electric machine according to the embodiment and the conventional car-type rotating electric machine. The horizontal axis is the frequency order. The order 1 is the fundamental frequency, that is, the power supply frequency. The vertical axis is the loss due to the analysis result, and the unit is Joule (J). In each order, the left is the Joule loss of the conventional prototype, and the right is the Joule loss of the improved machine.

ここで、従来型試作機とあるのは、従来方式、すなわち、軸方向貫通孔５０の径方向先端部５０ｂにも回転子バー１３が存在するかご型回転電機の試作品である。また、改良機とあるのは、本実施形態による軸方向貫通孔５０の径方向先端部５０ｂに先端部挿入部材５１を有するかご型回転電機１００である。なお、それぞれの試作機についての解析結果は、４Ｐ−１３２ｋＷ−４００Ｖ−５０Ｈｚの定格仕様について示している。   Here, the conventional prototype is a prototype of a squirrel-cage electric machine in which the rotor bar 13 is also present at the radial tip 50b of the axial through-hole 50, that is, the conventional prototype. Further, the improved machine is a squirrel-cage electric machine 100 having a tip insertion member 51 at a radial tip 50b of the axial through hole 50 according to the present embodiment. In addition, the analysis result about each prototype has shown about the rated specification of 4P-132kW-400V-50Hz.

従来型試作機と改良機の各周波数の次数でのジュール損失を比較すると、図４に示すように、特に１次周波数において、改良機は従来型試作機に比べて約８８％と、１０％以上ジュール損失が低下している。   When comparing the Joule loss at the order of each frequency of the conventional prototype and the improved machine, as shown in FIG. 4, the improved machine is about 88% and 10% compared to the conventional prototype, especially at the primary frequency. The Joule loss has been reduced.

図５は、実施形態に係るかご型回転電機と従来のかご型回転電機のそれぞれの合計のジュール損失を比較したグラフである。従来型試作機と改良機のそれぞれの全ジュール損失を比較すると、図５に示すように、改良機は従来型試作機に比べて約７６％、すなわち約３／４へとジュール損失が大幅に低下している。   FIG. 5 is a graph comparing the total joule loss of the car-type rotating electric machine according to the embodiment and the conventional car-type rotating electric machine. Comparing the total joule loss of the conventional prototype and the improved machine, as shown in FIG. 5, the improved machine has a joule loss of about 76%, that is, about 3/4 compared to the conventional prototype. It is falling.

以上のように、本発明によれば、回転子バーを有するかご型回転電機の効率の向上を図ることができる。   As described above, according to the present invention, the efficiency of a squirrel-cage electric machine having a rotor bar can be improved.

以上、本発明の実施形態を説明したが、実施形態は、例として提示したものであり、発明の範囲を限定することは意図していない。たとえば、実施形態では、径方向先端部５０ｂに先端部挿入部材５１を設けている場合を示したが、磁場が弱い場合等は、空間は基本的には非導電性、非磁性であるので、鋳造の場合を含め、径方向先端部５０ｂに先端部挿入部材５１を設けずに空間のままとしてもよい。   As mentioned above, although embodiment of this invention was described, embodiment is shown as an example and is not intending limiting the range of invention. For example, in the embodiment, the case where the distal end insertion member 51 is provided in the radial distal end portion 50b is shown. However, when the magnetic field is weak, the space is basically non-conductive and non-magnetic. Including the case of casting, the distal end insertion member 51 may not be provided in the radial distal end portion 50b and the space may be left as it is.

また、実施形態は、その他の様々な形態で実施されることが可能であり、発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更を行うことができる。   The embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

たとえば、実施形態では、導体バー用金属を注入し鋳造によって回転子バー１３および短絡環１４を一体で形成する場合を示したが、これに限定されない。たとえば、鋳造と同様の体系に導体バー用金属の微粉末を加圧充填して燒結することにより回転子バー１３および短絡環１４を一体で形成する方法であってもよい。実施形態やその変形は、発明の範囲や要旨に含まれると同様に、特許請求の範囲に記載された発明とその均等の範囲に含まれるものである。   For example, in the embodiment, the case where the rotor bar 13 and the short-circuit ring 14 are integrally formed by injecting the metal for the conductor bar and casting is shown, but the present invention is not limited to this. For example, the rotor bar 13 and the short-circuit ring 14 may be integrally formed by pressurizing and compacting a metal powder for a conductor bar in a system similar to casting. The embodiments and the modifications thereof are included in the scope of the invention and the scope of the invention, and are also included in the invention described in the claims and the equivalents thereof.

１０…回転子、１１…ロータシャフト、１２…回転子鉄心、１３…回転子バー、１４…短絡環、１５…エンドリングファン、２０…固定子、２１…固定子鉄心、２２…固定子コイル、３１…軸受、３２…フレーム、３５…外扇、５０…軸方向貫通孔、５０ａ…矩形部分、５０ｂ…径方向先端部、５１…先端部挿入部材、１００…かご型回転電機   DESCRIPTION OF SYMBOLS 10 ... Rotor, 11 ... Rotor shaft, 12 ... Rotor core, 13 ... Rotor bar, 14 ... Short-circuit ring, 15 ... End ring fan, 20 ... Stator, 21 ... Stator iron core, 22 ... Stator coil, DESCRIPTION OF SYMBOLS 31 ... Bearing, 32 ... Frame, 35 ... Outer fan, 50 ... Axial through-hole, 50a ... Rectangular part, 50b ... Radial tip part, 51 ... Tip part insertion member, 100 ... Cage type rotary electric machine

Claims (7)

回転可能に軸支されて回転軸中心で軸方向に延びるロータシャフトと、
前記ロータシャフトに固定されて、周方向に互いに間隔をあけて軸方向貫通孔が形成され前記軸方向に延びる回転子鉄心と、
前記回転子鉄心の径方向表面近傍であって前記軸方向に延びて前記軸方向貫通孔内に当該軸方向貫通孔の径方向先端部を残した空間を満たすように設けられ、前記回転子鉄心外の両側の端部は互いに電気的に結合している複数の回転子バーと、
前記回転子鉄心の前記軸方向の両側の外部にあって前記複数の回転子バーの端部のいずれとも電気的に結合する２つの環状の短絡環と、
を有する回転子と、
前記回転子鉄心の外周に前記回転子鉄心と間隔をあけて配設されて互いに周方向に間隔をあけて配列されて前記軸方向に延びて半径方向の内側に向かって突出する複数のティースが形成された固定子鉄心と、前記複数のティースに巻回された固定子コイルと、を有する固定子と、
を備えることを特徴とするかご型回転電機。 A rotor shaft that is rotatably supported and extends in the axial direction about the rotation axis;
A rotor core fixed to the rotor shaft and spaced apart from each other in the circumferential direction to form an axial through hole extending in the axial direction;
The rotor core is provided so as to fill a space near the radial surface of the rotor core, extending in the axial direction, and leaving a radial tip portion of the axial through hole in the axial through hole. A plurality of rotor bars whose ends on the outer sides are electrically coupled to each other;
Two annular short-circuit rings that are external to both sides of the rotor core in the axial direction and are electrically coupled to any of the ends of the plurality of rotor bars;
A rotor having
A plurality of teeth that are arranged on the outer periphery of the rotor core with a space from the rotor core, are arranged at intervals in the circumferential direction, extend in the axial direction, and project inward in the radial direction. A stator having a formed stator core and a stator coil wound around the plurality of teeth;
A squirrel-cage electric machine characterized by comprising: 前記軸方向貫通孔内の径方向先端部に設けられ軸方向に延びた非磁性かつ非導電性の先端部挿入部材をさらに有することを特徴とする請求項１に記載のかご型回転電機。   The squirrel-cage electric rotating machine according to claim 1, further comprising a non-magnetic and non-conductive tip insertion member provided at a radial tip in the axial through hole and extending in the axial direction. 前記回転子バーおよび前記短絡環は鋳造または金属製紛体充填後の焼結により一体に形成されていることを特徴とする請求項１または請求項２に記載のかご型回転電機。   The squirrel-cage rotating electric machine according to claim 1 or 2, wherein the rotor bar and the short-circuit ring are integrally formed by casting or sintering after filling with a metal powder body. 前記軸方向貫通孔の断面形状の径方向先端部は、中央が突出していることを特徴とする請求項１ないし請求項３のいずれか一項に記載のかご型回転電機。   4. The squirrel-cage rotating electric machine according to claim 1, wherein a center of the radial front end portion of the cross-sectional shape of the axial through hole protrudes. 5. 回転可能に軸支されて回転軸中心で軸方向に延びるロータシャフトと、
前記ロータシャフトに固定されて、周方向に互いに間隔をあけて軸方向貫通孔が形成され前記軸方向に延びる回転子鉄心と、
前記回転子鉄心の径方向表面近傍であって前記軸方向に延びて前記軸方向貫通孔内に当該軸方向貫通孔の径方向先端部を残した空間を満たすように設けられ、前記回転子鉄心外の両側の端部は互いに電気的に結合している複数の回転子バーと、
前記回転子鉄心の前記軸方向の両側の外部にあって前記複数の回転子バーの端部のいずれとも電気的に結合する２つの環状の短絡環と、
を有することを特徴とするかご型回転電機の回転子。 A rotor shaft that is rotatably supported and extends in the axial direction about the rotation axis;
A rotor core fixed to the rotor shaft and spaced apart from each other in the circumferential direction to form an axial through hole extending in the axial direction;
The rotor core is provided so as to fill a space near the radial surface of the rotor core, extending in the axial direction, and leaving a radial tip portion of the axial through hole in the axial through hole. A plurality of rotor bars whose ends on the outer sides are electrically coupled to each other;
Two annular short-circuit rings that are external to both sides of the rotor core in the axial direction and are electrically coupled to any of the ends of the plurality of rotor bars;
A squirrel-cage rotating machine rotor comprising: 前記軸方向貫通孔内の径方向先端部に設けられ軸方向に延びた非磁性かつ非導電性の先端部挿入部材をさらに有することを特徴とする請求項５に記載のかご型回転電機の回転子。   The rotation of the squirrel-cage rotating electric machine according to claim 5, further comprising a non-magnetic and non-conductive tip insertion member provided at a radial tip in the axial through hole and extending in the axial direction. Child. かご型回転電機の回転子の製造方法であって、
回転子鉄心に形成された軸方向貫通孔の径方向先端部に軸方向に延びた先端部挿入部材を設定する先端部挿入部材設定ステップと、
前記先端部挿入部材設定ステップの後に、前記軸方向貫通孔が形成され前記先端部挿入部材が設定された前記回転子鉄心と端部の鋳型とを組み立て一体化した鋳型を形成する鋳型組立てステップと、
前記鋳型組立てステップの後に、前記一体化した鋳型に回転子バー用の熔解した金属を流し込む充填ステップと、
前記一体化した鋳型から、前記回転子鉄心と短絡環部分の鋳型を取り外す鋳型解体ステップと、
を有することを特徴とする回転子製造方法。 A method of manufacturing a rotor of a cage rotating electric machine,
A tip insertion member setting step for setting a tip insertion member extending in the axial direction at the radial tip of the axial through hole formed in the rotor core;
A mold assembling step for forming a mold obtained by assembling and integrating the rotor core having the axial through-hole formed therein and the distal end insertion member set and an end mold, after the leading end insertion member setting step; ,
After the mold assembly step, a filling step of pouring molten metal for a rotor bar into the integrated mold,
A mold dismantling step for removing the rotor core and the mold of the short-circuited ring portion from the integrated mold,
A rotor manufacturing method characterized by comprising:
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