JP5994491B2 - Cooling fin structure for air-cooled rotary electric machine - Google Patents

Cooling fin structure for air-cooled rotary electric machine Download PDF

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JP5994491B2
JP5994491B2 JP2012189856A JP2012189856A JP5994491B2 JP 5994491 B2 JP5994491 B2 JP 5994491B2 JP 2012189856 A JP2012189856 A JP 2012189856A JP 2012189856 A JP2012189856 A JP 2012189856A JP 5994491 B2 JP5994491 B2 JP 5994491B2
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cooling
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cooling fin
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frame
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JP2014050173A (en
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昌博 星
昌博 星
明秀 真下
明秀 真下
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Fuji Electric Co Ltd
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Description

本発明は、空冷式回転電機のフレーム周面に布設して冷却風と熱交換させる冷却フィンの構造に関する。   The present invention relates to a structure of a cooling fin that is laid on a frame peripheral surface of an air-cooled rotary electric machine and exchanges heat with cooling air.

まず、全閉外扇形電動機を例に、従来における回転電機(インナーロータ形)の一般的な組立構造を図３（ａ），（ｂ）に示す。図において、１はフレーム（外枠）２とその両端に配したエンドブラケット３との組立体になるケーシング、４はフレーム２の内周側に収容配置した固定子コア、５は固定子コイル、６は回転子(例えば、永久磁石形の回転子)、７は軸受、８は回転子６の軸端（反駆動側）に取付けた外部ファン（外扇）、９はファンカバーである。前記フレーム２の周面上には、ラジアル方向に張り出して軸方向に延在する多数枚の冷却フィン１０が周方向に配列して形成されている。   First, a typical assembly structure of a conventional rotating electric machine (inner rotor type) is shown in FIGS. In the figure, 1 is a casing which is an assembly of a frame (outer frame) 2 and end brackets 3 arranged at both ends thereof, 4 is a stator core accommodated and disposed on the inner peripheral side of the frame 2, 5 is a stator coil, 6 is a rotor (for example, a permanent magnet type rotor), 7 is a bearing, 8 is an external fan (outer fan) attached to the shaft end (reverse drive side) of the rotor 6, and 9 is a fan cover. On the peripheral surface of the frame 2, a large number of cooling fins 10 that extend in the radial direction and extend in the axial direction are arranged in the circumferential direction.

上記構成で回転電機は次記のように冷却される。すなわち、回転電機の運転時に回転子６に設けた外部ファン８が回転すると、図示矢印で表すように軸端から取り込んだ外気の冷却風がファンカバー９を通じて冷却フィン１０の相互間の通風路１１に沿ってフレーム２の外周面上を軸方向に通流し、この通風過程で冷却風とフレーム２の外表面および冷却フィン１０との熱交換により、フレーム２に伝熱した回転電機本体の発生熱（固定子、回転子の銅損、鉄損及び機械損に伴う発熱等）が外方に熱放散される。   With the above configuration, the rotating electrical machine is cooled as follows. That is, when the external fan 8 provided on the rotor 6 rotates during operation of the rotating electrical machine, the cooling air of the outside air taken in from the shaft end as shown by the arrow in the drawing passes through the fan cover 9 and the ventilation path 11 between the cooling fins 10. Along the outer peripheral surface of the frame 2 in the axial direction, and heat generated by the rotating electrical machine body that is transferred to the frame 2 by heat exchange between the cooling air and the outer surface of the frame 2 and the cooling fins 10 in this ventilation process. (Heat generation due to copper loss, iron loss and mechanical loss of the stator and rotor) is dissipated to the outside.

なお、前記の冷却フィン１０は、鋳造、アルミダイキャスト法、あるいは押出成形法などによりケーシング１のフレーム２と一体成形するか、あるいはフレーム２の周面に冷却フィン１０を各枚ごとに溶接するなどして形成している。   The cooling fin 10 is integrally formed with the frame 2 of the casing 1 by casting, an aluminum die casting method, an extrusion molding method, or the like, or the cooling fin 10 is welded to the peripheral surface of the frame 2 for each sheet. And so on.

また、回転電機の外被冷却効果を高めるために、前記冷却フィン１０に送流する冷却風量を増加する、あるいは冷却フィンの枚数を増やし放熱面積を増加させて外被冷却性能を高める方法のほか、冷却フィン１０をフレーム２の長手方向（冷却風の通流方向）に沿って前後複数列に分割した上で、各列の間で冷却フィン１０同士が前後に重ならないように周方向にオフセットして千鳥状に配列し、冷却フィンと冷却気流との間の熱温度境界層を分断および生成して熱交換効率を高めるようにした千鳥配置の冷却フィン構造が知られている（例えば、特許文献１参照）。   In addition to increasing the jacket cooling effect of the rotating electrical machine, there is a method of increasing the jacket cooling performance by increasing the amount of cooling air sent to the cooling fin 10 or increasing the number of cooling fins to increase the heat radiation area. The cooling fins 10 are divided into a plurality of front and rear rows along the longitudinal direction of the frame 2 (the flow direction of the cooling air), and offset in the circumferential direction so that the cooling fins 10 do not overlap each other between the rows. A staggered cooling fin structure is known in which the heat temperature boundary layer between the cooling fins and the cooling airflow is divided and generated to enhance the heat exchange efficiency (for example, patents). Reference 1).

特開２００２−１３４６７号公報（請求項４、段落００３９〜００４１、図５）JP 2002-13467 (Claim 4, paragraphs 0039 to 0041, FIG. 5)

前記のようにフレーム２の外周面上に布設して軸方向に沿い前後列に分割した冷却フィン１０を千鳥状に配列することで冷却フィン１０と冷却風との熱交換効率を向上できるものの、冷却フィン１０をケーシング１のフレーム２と一体に鋳造するなどして形成した従来構造では、冷却フィン１０の千鳥配置により鋳造金型が複雑となって製作コストが増大するほか、回転電機のモデルチェンジあるいは新機種開発に伴い冷却フィン１０の形状および配列を変更する場合には、フレーム全体の構造および鋳造用金型を新たに設計するなど製品の製作に多大なコストと時間を要する問題がある。   Although it is possible to improve the heat exchange efficiency between the cooling fins 10 and the cooling air by arranging the cooling fins 10 laid on the outer peripheral surface of the frame 2 as described above and arranged in a staggered manner along the axial direction, In the conventional structure formed by casting the cooling fins 10 integrally with the frame 2 of the casing 1, the casting mold becomes complicated due to the staggered arrangement of the cooling fins 10 and the manufacturing cost increases. Alternatively, when the shape and arrangement of the cooling fins 10 are changed along with the development of a new model, there is a problem that a great deal of cost and time are required for manufacturing the product, such as newly designing the structure of the entire frame and the casting mold.

本発明は上記の点に鑑みなされたものであり、その目的は前記問題を解決してフレームの周面に布設する冷却フィンの配列および仕様の変更にも柔軟に対応して大幅なコストの低減と併せて、外被冷却性能の向上化が図れるように改良した空冷式回転電機の冷却フィン構造を提供することにある。   The present invention has been made in view of the above points, and its object is to solve the above problems and flexibly cope with changes in the arrangement and specifications of cooling fins laid on the peripheral surface of the frame, thereby significantly reducing costs. In addition, an object of the present invention is to provide a cooling fin structure for an air-cooled rotary electric machine that is improved so as to improve the jacket cooling performance.

上記目的を達成するために、本発明によれば、固定子および回転子を内蔵したケーシングの軸方向に沿ってそのフレーム周面に多数枚の冷却フィンを布設し、冷却風を前記冷却フィンに沿いフレームの周面に送風して固定子および回転子を冷却するようにした外被冷却式の回転電機において、
所定ピッチ間隔で平行に並ぶ複数枚のフィンを取付座板に一体に形成したフィンの集合体により別置冷却フィンの単位ブロックを構成し、
前記冷却フィンの単位ブロックは、前記各枚のフィンを前記取付座板にその中心軸に対して周方向にずらしてオフセット配列した構成とし、該冷却フィンの単位ブロックを前記フレームの周面上にその向きを交互に１８０°反転して前後列に配置し、前記前後の冷却フィンの単位ブロックの各枚のフィンを冷却風の流れ方向に沿って前記フレームの周面に千鳥配置したことを特徴とする（請求項１）。 In order to achieve the above object, according to the present invention, a plurality of cooling fins are installed on the peripheral surface of the frame along the axial direction of a casing containing a stator and a rotor, and cooling air is supplied to the cooling fins. In a jacket-cooled rotary electric machine that cools the stator and the rotor by blowing air to the peripheral surface of the along-frame,
A unit block of separate cooling fins is constituted by an assembly of fins integrally formed on a mounting seat plate with a plurality of fins arranged in parallel at a predetermined pitch interval,
The cooling fin unit block has a structure in which the fins of the respective sheets are offset from the mounting seat plate in the circumferential direction with respect to the central axis thereof, and the cooling fin unit blocks are arranged on the peripheral surface of the frame. The direction is alternately inverted by 180 ° and arranged in the front and rear rows, and the fins of each unit block of the front and rear cooling fins are staggered on the peripheral surface of the frame along the flow direction of the cooling air. (Claim 1).

ここで、前記冷却フィンの単位ブロックは、その配置および組立性を簡便化するために次記のような態様で構成することができる。
（１）前記冷却フィンの単位ブロックは、その取付座板の中心軸に対して各枚のフィンを周方向に１／４ピッチずらしてオフセット配列した構造になり、該冷却フィンの単位ブロックをフレームの周面上に布設する際に、その向きを交互に１８０°反転して前後列に配置する（請求項２）。
（２）前記冷却フィンの単位ブロックは、締結ボルトを介して取付座板をフレームの周面に締結するものとし、ここで前記締結ボルトを取付座板の中心に対して対称位置に配置する（請求項３）。 Here, the unit block of the cooling fin can be configured in the following manner in order to simplify the arrangement and assembly.
(1) The unit block of the cooling fin has a structure in which each fin is offset from the central axis of the mounting seat plate by a quarter pitch shift in the circumferential direction. When laying on the peripheral surface, the direction is alternately inverted by 180 ° and arranged in the front and rear rows (Claim 2).
(2) The unit block of the cooling fin fastens the mounting seat plate to the peripheral surface of the frame via a fastening bolt, and the fastening bolt is disposed at a symmetrical position with respect to the center of the mounting seat plate ( Claim 3).

前記構成のように、冷却フィンの単位ブロックを別置部品として回転電機のフレームとは別に製作しておき、この単位ブロックを共通部品としてフレームの周面に千鳥配置することにより、外被冷却性能の向上と併せて、冷却フィンの配列変更、あるいは固定子および回転子の軸長が異なる別機種の回転電機に対しても、冷却フィン単位ブロックの取付け個数および配置位置を適宜選定することで柔軟に対応できる。また、単位ブロック自体は小形な構造物であり、その成形金型に高いコストをかけずに低コストで製作できる。そのほか、冷却フィンの形状を特殊な形状（例えば筒形，Ｔ字形）に変更する場合でも、回転電機のフレーム構造は従前のまま、冷却フィン単位ブロックのフィン形状を変更するだけで簡単に対応できるなど、フレームと冷却フィンが一体構造になる従来構造と比べて大幅なコスト低減化が図れる。   As in the above configuration, the cooling fin unit block is manufactured separately from the rotating electrical machine frame as a separate part, and the unit block is arranged in a staggered manner on the peripheral surface of the frame as a common part. In addition to improvements in cooling fins, it is possible to flexibly change the number of cooling fin unit blocks to be installed and the arrangement position for different types of rotating electrical machines with different stator and rotor shaft lengths. It can correspond to. In addition, the unit block itself is a small structure, and can be manufactured at a low cost without incurring a high cost for the molding die. In addition, even when the shape of the cooling fin is changed to a special shape (for example, a cylindrical shape or a T-shape), it can be easily dealt with by simply changing the fin shape of the cooling fin unit block while maintaining the frame structure of the rotating electrical machine. Thus, the cost can be greatly reduced as compared with the conventional structure in which the frame and the cooling fin are integrated.

また、共通部品である別置冷却フィンの単位ブロックについて、その取付座板の中心軸に対して各枚のフィンを周方向に１／４ピッチずらしてオフセット配列した構造（請求項２）とすることで、該単位ブロックを前後列に並べてフレームの周面上に布設する際にはその向きを交互に１８０°反転して取付けるだけで各単位ブロックの間で冷却フィンを簡単に千鳥配置でき、これにより製作する単位ブロックを一種類で済む。   Moreover, about the unit block of the separate cooling fin which is a common component, it is set as the structure (Claim 2) which each fin was shifted by 1/4 pitch with respect to the central axis of the mounting seat plate, and was offset-arranged. Thus, when arranging the unit blocks in the front and rear rows and laying them on the peripheral surface of the frame, it is possible to easily arrange the cooling fins between the unit blocks simply by reversing the direction by 180 ° and attaching them. As a result, only one type of unit block is required.

さらに、この単位ブロックをフレーム周面に固着する締結ボルトを取付座板の中心に対して対称位置に配置する（請求項３）ことで、フレームの周面上に穿設するボルト穴を軸方向に揃えて簡単に位置決め，穴加工することができる。   Further, the fastening bolt for fixing the unit block to the frame peripheral surface is arranged at a symmetrical position with respect to the center of the mounting seat plate (Claim 3), whereby the bolt hole drilled on the peripheral surface of the frame is axially arranged. Can be easily positioned and drilled.

本発明の実施例による冷却フィンの組立構造図であって、（ａ）は冷却フィンの単位ブロックを前後列に並べて回転電機のフレーム周面に布設した状態を表す正面図、（ｂ）は（ａ）の模式平面図である。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an assembly structure diagram of cooling fins according to an embodiment of the present invention, in which (a) is a front view showing a state in which cooling fin unit blocks are arranged in front and rear rows and laid on a frame peripheral surface of a rotating electrical machine; It is a schematic plan view of a). 図１（ａ）に対応する単位ブロックの形状を表す模式図である。It is a schematic diagram showing the shape of the unit block corresponding to Fig.1 (a). 全閉外扇形回転電の従来における組立構造図であって、（ａ）はその上半部を断面した側面図、（ｂ）は（ａ）におけるＡ部の拡大断面図である。It is the assembly structure figure in the past of a fully-closed outer fan-shaped rotary electric power, Comprising: (a) is the side view which cut the upper half part, (b) is an expanded sectional view of the A section in (a).

以下、この発明による冷却フィン構造の実施の形態を図１（ａ），（ｂ）、および図２に示す実施例に基づいて説明する。   Hereinafter, an embodiment of a cooling fin structure according to the present invention will be described with reference to FIGS. 1 (a) and 1 (b) and an example shown in FIG.

図示実施例においては、回転電機のフレーム２と別個に作製した次記構成になる別置形冷却フィンの単位ブロック１２を共通部品として、この単位ブロック１２をフレーム２の周面上に分散配列して図３に示した空冷式回転電機の冷却フィンを構成している。   In the illustrated embodiment, the unit blocks 12 of separately mounted cooling fins that are manufactured separately from the frame 2 of the rotating electrical machine are used as common parts, and the unit blocks 12 are distributed and arranged on the peripheral surface of the frame 2. The cooling fin of the air-cooled rotary electric machine shown in FIG. 3 is configured.

すなわち、冷却フィンの単位ブロック１２は、円筒形フレーム２の外径に対応する曲率半径を有する断面円弧状の取付座板１２ａに所定ピッチ間隔（フィンピッチ）Ｐを隔てて平行に並ぶ複数枚のフィン１２ｂ（図示例ではフィン枚数が５枚）を起立形成して一体的な集合体となる。該単位ブロック１２は締結ボルト１３を介してフレーム２の周面に密着して固着される。なお、この単位ブロック１２の諸元（取付座板１２ａの円弧長、奥行き長さ、およびフィン１２ｂの枚数、板厚、高さ、フィンピッチＰ）は適用する回転電機の仕様に合わせて設計し、アルミダイキャスト法、押出成形法などにより製作する。   In other words, the cooling fin unit block 12 has a plurality of sheets arranged in parallel with a predetermined pitch interval (fin pitch) P on the mounting seat plate 12a having an arc cross section having a radius of curvature corresponding to the outer diameter of the cylindrical frame 2. The fins 12b (in the illustrated example, the number of fins is 5) are formed upright to form an integral assembly. The unit block 12 is fixed in close contact with the peripheral surface of the frame 2 via fastening bolts 13. The specifications of the unit block 12 (the arc length and depth length of the mounting seat 12a, the number of fins 12b, the plate thickness, the height, and the fin pitch P) are designed according to the specifications of the rotating electric machine to be applied. Manufactured by aluminum die casting method, extrusion molding method, etc.

ここで、前記冷却フィンの単位ブロック１２について、その取付座板１２ａの板面上に形成したフィン１２ｂは、図２のように取付座板１２ａの中心Ｏに対して各枚のフィン１２ｂが周方向にＰ／４ピッチだけオフセット配列して形成している。また、図示例では取付座板１２ａを４本の締結ボルト１３（図１（ｂ）参照）でフレーム２に固定するようにし、その締結ボルト１３のボルト通し穴１２ｃは取付座板１２ａの中心Ｏに対して等距離Ｌの対称位置に穿設している。   Here, with respect to the unit block 12 of the cooling fin, the fins 12b formed on the surface of the mounting seat plate 12a have the fins 12b around the center O of the mounting seat plate 12a as shown in FIG. It is formed by offset arrangement by P / 4 pitch in the direction. Further, in the illustrated example, the mounting seat plate 12a is fixed to the frame 2 with four fastening bolts 13 (see FIG. 1B), and the bolt through holes 12c of the fastening bolts 13 are the center O of the mounting seat plate 12a. Are drilled at symmetrical positions at an equal distance L.

そして、前記の冷却フィン単位ブロック１２をフレーム２の周面に分散して布設する際には、図１（ｂ）で示すように姿勢を交互に１８０°反転して前後列に並べて配置する。これにより、前列の単位ブロック１２と後列の単位ブロック１２の間で各枚のフィン１２ａの間が周方向にＰ／２ピッチずれて千鳥状の配置となる。   When the cooling fin unit blocks 12 are distributed and installed on the peripheral surface of the frame 2, the postures are alternately inverted by 180 ° and arranged in the front and rear rows as shown in FIG. Thereby, between the unit blocks 12 in the front row and the unit blocks 12 in the back row, the spaces between the fins 12a are shifted by P / 2 pitch in the circumferential direction to form a staggered arrangement.

また、前記のように締結ボルト１３は取付座板１２ａの中心に対して対称位置に配置しているので、図１（ｂ）のように単位ブロック１２の姿勢を１８０°反転してもボルト１３の位置は変わらない。したがって、フレーム２の周面に穿設するボルト穴をフレームの軸方向に揃えて簡単に位置決めして、加工することができる。   Further, as described above, since the fastening bolts 13 are arranged at symmetrical positions with respect to the center of the mounting seat plate 12a, even if the posture of the unit block 12 is reversed by 180 ° as shown in FIG. The position of does not change. Accordingly, the bolt holes drilled in the peripheral surface of the frame 2 can be easily positioned and processed by aligning them in the axial direction of the frame.

前記の構成で、例えば図３における外部ファン８等の送風手段を経て供給される冷却風をフレーム２の周面に沿って軸方向に送風すると、図１（ｂ）の矢印（ａｉｒ）で表すように、冷却風は前後列に並ぶ単位ブロック１２の間で各単位ブロック１２に形成した千鳥配置のフィン１２ｂの間を縫うように流れる。これにより、先記の特許文献１と同様に冷却風の通風方向に沿って前後に並ぶフィン間の温度境界層を分断して各列における冷却フィンと冷却風との熱交換効率を高めて回転電機の外被冷却性能を向上できる。   With the above configuration, for example, when the cooling air supplied through the blowing means such as the external fan 8 in FIG. 3 is blown in the axial direction along the peripheral surface of the frame 2, it is represented by an arrow (air) in FIG. As described above, the cooling air flows so as to sew between the staggered fins 12 b formed in each unit block 12 between the unit blocks 12 arranged in the front and rear rows. Thereby, similarly to the above-mentioned Patent Document 1, the temperature boundary layer between the fins arranged in the front and rear along the ventilation direction of the cooling air is divided to increase the heat exchange efficiency between the cooling fins and the cooling air in each row and rotate. The jacket cooling performance of the electric machine can be improved.

しかも、冷却フィンの単位ブロック１２を共通部品として回転電機のフレーム２の周面上に配列したことにより、冷却フィンをフレームと一体に形成した従来の冷却フィン構造と比べて大幅なコスト低減が図れる。また、回転電機の仕様に合わせて冷却フレーム単位ブロック１２の配置個数あるいは配列を変更する場合でも柔軟に対応できる。   In addition, by arranging the cooling fin unit blocks 12 as common parts on the peripheral surface of the frame 2 of the rotating electrical machine, a significant cost reduction can be achieved compared to the conventional cooling fin structure in which the cooling fins are formed integrally with the frame. . Further, even when the number or arrangement of the cooling frame unit blocks 12 is changed in accordance with the specifications of the rotating electrical machine, it can be flexibly handled.

なお、冷却フィン単位ブロック１２の取付座板１２ａは、フレーム２を介して伝熱する回転電機の発生熱をフィン１２ｂに伝えるヒートスプレッダとして機能するものであり、その組み付け時には取付座板１２ａとフレームの周面との間に伝熱グリースを塗布するか、伝熱シートあるいは伝熱コンパウンドを介在するなどしてフレームと取付座板との間の伝熱抵抗を低く抑えることができる。   The mounting seat plate 12a of the cooling fin unit block 12 functions as a heat spreader that transmits the heat generated by the rotating electrical machine that transfers heat through the frame 2 to the fins 12b. At the time of assembly, the mounting seat plate 12a and the frame The heat transfer resistance between the frame and the mounting seat plate can be kept low by applying heat transfer grease between the peripheral surface and a heat transfer sheet or a heat transfer compound.

１：回転電機のケーシング
２：フレーム
４：固定子
６：回転子
１２：冷却フィンの単位ブロック
１２ａ：取付座板
１２ｂ：フィン
１２ｃ：締結ボルトの通し穴
１３：締結ボルト
Ｐ：フィンピッチ 1: Casing of rotating electrical machine 2: Frame 4: Stator 6: Rotor 12: Cooling fin unit block 12a: Mounting seat 12b: Fin 12c: Fastening bolt through hole 13: Fastening bolt P: Fin pitch

Claims (3)

固定子および回転子を内蔵したケーシングの軸方向に沿ってそのフレーム周面に多数枚の冷却フィンを布設し、冷却風を前記冷却フィンに沿いフレームの周面に送風して固定子および回転子を冷却するようにした外被冷却式の回転電機において、
所定ピッチ間隔で平行に並ぶ複数枚のフィンを取付座板に一体に形成したフィンの集合体により別置冷却フィンの単位ブロックを構成し、
前記冷却フィンの単位ブロックは、前記各枚のフィンを前記取付座板にその中心軸に対して周方向にずらしてオフセット配列した構成とし、該冷却フィンの単位ブロックを前記フレームの周面上にその向きを交互に１８０°反転して前後列に配置し、前記前後の冷却フィンの単位ブロックの各枚のフィンを冷却風の流れ方向に沿って前記フレームの周面に千鳥配置したことを特徴とする空冷式回転電機の冷却フィン構造。 A large number of cooling fins are installed on the peripheral surface of the frame along the axial direction of the casing containing the stator and rotor, and the cooling air is blown to the peripheral surface of the frame along the cooling fins. In a jacket-cooled rotating electrical machine that cools
A unit block of separate cooling fins is constituted by an assembly of fins integrally formed on a mounting seat plate with a plurality of fins arranged in parallel at a predetermined pitch interval,
The cooling fin unit block has a structure in which the fins of the respective sheets are offset from the mounting seat plate in the circumferential direction with respect to the central axis thereof, and the cooling fin unit blocks are arranged on the peripheral surface of the frame. The direction is alternately inverted by 180 ° and arranged in the front and rear rows, and the fins of each unit block of the front and rear cooling fins are staggered on the peripheral surface of the frame along the flow direction of the cooling air. A cooling fin structure for an air-cooled rotary electric machine. 請求項１に記載の冷式回転電機の冷却フィン構造において、前記冷却フィンの単位ブロックの各枚のフィンを周方向に１／４ピッチずらしてオフセット配列したことを特徴とする空冷式回転電機の冷却フィン構造。 In the cooling fin structure of the cold-type rotating electrical machine according to claim 1, air-cooled rotary electric machine characterized by a kite and offset array are shifted 1/4 pitch of each of fins in the circumferential direction of the unit block of the cooling fins Cooling fin structure. 請求項１または２に記載の空冷式回転電機の冷却フィン構造において、冷却フィンの単位ブロックは、締結ボルトを介して取付座板をフレームの周面に締結するものとし、ここで前記締結ボルトを取付座板の中心に対して対称位置に配置したことを特徴とする空冷式回転電機の冷却フィン構造。 3. A cooling fin structure for an air-cooled rotating electrical machine according to claim 1, wherein the unit block of the cooling fin fastens the mounting seat plate to the peripheral surface of the frame via a fastening bolt, wherein the fastening bolt is A cooling fin structure for an air-cooled rotary electric machine, wherein the cooling fin structure is arranged in a symmetrical position with respect to the center of the mounting seat plate.
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