JP2021052445A - Coil end cooling structure - Google Patents

Coil end cooling structure Download PDF

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JP2021052445A
JP2021052445A JP2019172025A JP2019172025A JP2021052445A JP 2021052445 A JP2021052445 A JP 2021052445A JP 2019172025 A JP2019172025 A JP 2019172025A JP 2019172025 A JP2019172025 A JP 2019172025A JP 2021052445 A JP2021052445 A JP 2021052445A
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oil
coil end
cooling
end cover
stator
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JP7298415B2 (en
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佐藤　潤一
Junichi Sato
潤一 佐藤
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Meidensha Corp
Meidensha Electric Manufacturing Co Ltd
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Meidensha Electric Manufacturing Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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    • Y02T10/64—Electric machine technologies in electromobility

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Abstract

To efficiently cool a coil end by cooling oil supplied from between a stator and a frame of an oil cooling type rotary machine.SOLUTION: A coil end cooling structure 1 of a rotary machine 2 includes oil cooling ducts 10a, 10b and 10c for supplying cooling oil to a body part 40 of a coil end cover 4 from between a stator 3 and a frame. The oil cooling ducts 10a and 10b in the oil cooling ducts 10a, 10b and 10c project to the body part 40 side of the coil end cover 4 along an axial direction of the stator 3 (coil end cover 4, rotor 5 and shaft 6) from between the stator 3 and the frame to be arranged.SELECTED DRAWING: Figure 1

Description

本発明は、油冷式の回転機のコイルエンド冷却構造に関する。 The present invention relates to a coil end cooling structure for an oil-cooled rotary machine.

図４に示された油冷式の回転機のコイルエンド冷却構造としては、例えば、冷却油を固定子の軸方向の中間部位から導入して固定子とフレームとの間に流通させてから固定子の端部からコイルエンドに流出させる方式が知られている（特許文献１〜３）。 As the coil end cooling structure of the oil-cooled rotary machine shown in FIG. 4, for example, cooling oil is introduced from an intermediate portion in the axial direction of the stator, circulated between the stator and the frame, and then fixed. A method of flowing out from the end of the child to the coil end is known (Patent Documents 1 to 3).

特開２０１６−５２３００９号公報Japanese Unexamined Patent Publication No. 2016-52309 特開２０１５−２１１５４３号公報Japanese Unexamined Patent Publication No. 2015-211543 特開２０１９−４１４８７号公報JP-A-2019-41487

図４に例示された従来のコイルエンドカバー４の冷却構造は、固定子３の軸方向の中間部位から導入された冷却油が固定子３とフレーム７との間に介在する油冷ダクト１０ｃに供される。油冷ダクト１０ｃは固定子３の外周部に複数配置形成されている。この油冷ダクト１０ｃを介して固定子３の端部に達した冷却油は、固定子３（回転子５，シャフト６）の軸方向に直交する同一平面に在る複数の油冷ダクト１０ｃからコイルエンドカバー４の本体部４０の外周面に流れ出る。ここで、図５の冷却油の流れの解析結果によると、隣接する油冷ダクト１０ｃから流出された冷却油が干渉するので、冷却油の流速が低下する傾向にある。このことから、コイルエンドカバー４の冷却効率を高めるには、この干渉を可能な限り少なくすることが必要となる。 In the conventional cooling structure of the coil end cover 4 illustrated in FIG. 4, the cooling oil introduced from the axial intermediate portion of the stator 3 is interposed in the oil cooling duct 10c between the stator 3 and the frame 7. Served. A plurality of oil cooling ducts 10c are arranged and formed on the outer peripheral portion of the stator 3. The cooling oil that has reached the end of the stator 3 through the oil cooling duct 10c is supplied from a plurality of oil cooling ducts 10c located on the same plane orthogonal to the axial direction of the stator 3 (rotor 5, shaft 6). It flows out to the outer peripheral surface of the main body 40 of the coil end cover 4. Here, according to the analysis result of the flow of the cooling oil in FIG. 5, the flow velocity of the cooling oil tends to decrease because the cooling oil flowing out from the adjacent oil cooling duct 10c interferes. Therefore, in order to increase the cooling efficiency of the coil end cover 4, it is necessary to reduce this interference as much as possible.

本発明は、以上の事情を鑑み、油冷式の回転機の固定子とフレームとの間から供される冷却油によりコイルエンドを効率よく冷却することを課題とする。 In view of the above circumstances, it is an object of the present invention to efficiently cool the coil end with the cooling oil provided between the stator of the oil-cooled rotary machine and the frame.

そこで、本発明の一態様は、油冷式の回転機のコイルエンド冷却構造であって、前記回転機の固定子とフレームとの間から冷却油をコイルエンドカバーの本体部に供する複数の油冷ダクトを有し、前記複数の油冷ダクトのうち、いくつかの油冷ダクトは、前記固定子と前記フレームとの間から前記本体部側に張り出して設けられ、前記いくつかの油冷ダクトのうち、一方のいくつかの油冷ダクトは、他方のいくつかの油冷ダクトとは張り出し長さが異なる。 Therefore, one aspect of the present invention is a coil end cooling structure of an oil-cooled rotary machine, and a plurality of oils that supply cooling oil to the main body of the coil end cover from between the stator and the frame of the rotary machine. It has a cooling duct, and among the plurality of oil cooling ducts, some oil cooling ducts are provided so as to project from between the stator and the frame toward the main body portion, and some of the oil cooling ducts are provided. Of these, some oil-cooled ducts on one side have different overhang lengths from some oil-cooled ducts on the other side.

本発明の一態様は、前記コイルエンド冷却構造において、前記複数の油冷ダクトは、前記固定子の軸方向及び重力方向に沿う断面を対称に配置される。 In one aspect of the present invention, in the coil end cooling structure, the plurality of oil cooling ducts are arranged symmetrically in cross sections along the axial direction and the gravity direction of the stator.

本発明の一態様は、前記コイルエンド冷却構造において、前記一方のいくつかの油冷ダクトは、前記他方のいくつかの油冷ダクトよりも前記断面に近い位置において前記対称に配置される。 In one aspect of the present invention, in the coil end cooling structure, the one oil-cooled duct is arranged symmetrically at a position closer to the cross section than the other oil-cooled duct.

本発明の一態様は、前記コイルエンド冷却構造において、前記一方のいくつかの油冷ダクトは、その張り出し長さが前記コイルエンドカバーの軸方向長さの半分未満である。 In one aspect of the present invention, in the coil end cooling structure, the overhang length of some of the oil cooling ducts is less than half of the axial length of the coil end cover.

本発明の一態様は、前記コイルエンド冷却構造において、前記冷却油は、前記コイルエンドカバーの外周面に達した冷却油が当該コイルエンドカバーの端部からはみ出ない程度の流速で供される。 In one aspect of the present invention, in the coil end cooling structure, the cooling oil is provided at a flow velocity such that the cooling oil that has reached the outer peripheral surface of the coil end cover does not protrude from the end portion of the coil end cover.

以上の本発明によれば、油冷式の回転機の固定子とフレームとの間から供される冷却油によりコイルエンドを効率よく冷却できる。 According to the above invention, the coil end can be efficiently cooled by the cooling oil provided between the stator of the oil-cooled rotary machine and the frame.

（ａ）は本発明のコイルエンド冷却構造の態様例を示した斜視図、（ｂ）は当該態様例の平面図。(A) is a perspective view showing a mode example of the coil end cooling structure of the present invention, and (b) is a plan view of the mode example. 図１の態様例における冷却油の流れを示す解析結果。The analysis result which shows the flow of the cooling oil in the example of the aspect of FIG. （ａ）は従来のコイルエンド冷却構造の態様例における熱伝達率の分布の解析結果、（ｂ）は図１の態様例における熱伝達率の分布を示す解析結果。(A) is an analysis result of the distribution of heat transfer coefficient in the embodiment of the conventional coil end cooling structure, and (b) is an analysis result showing the distribution of heat transfer coefficient in the example of the embodiment of FIG. （ａ）は従来のコイルエンド冷却構造の態様例を示した正面図、（ｂ）は当該態様例の油冷ダクトを示した拡大正面図、（ｃ）は当該態様例の斜視図、（ｄ）は当該態様例の正面図。(A) is a front view showing an embodiment of a conventional coil end cooling structure, (b) is an enlarged front view showing an oil cooling duct of the embodiment, and (c) is a perspective view of the embodiment, (d). ) Is a front view of the example. 図４の態様例における冷却油の流れを示す解析結果。The analysis result which shows the flow of the cooling oil in the example of the aspect of FIG.

以下に図面を参照しながら本発明の実施形態について説明する。 An embodiment of the present invention will be described below with reference to the drawings.

図１に示された本発明の一態様であるコイルエンド冷却構造１は、例えば、図４に示された油冷式の回転機２に適用される。すなわち、コイルエンド冷却構造１は、同図の回転機２において、固定子３とフレーム７との間から冷却油をコイルエンドカバー４の本体部４０に供する油冷ダクト１０ａ，１０ｂ，１０ｃを有する。 The coil end cooling structure 1 which is one aspect of the present invention shown in FIG. 1 is applied to, for example, the oil-cooled rotary machine 2 shown in FIG. That is, the coil end cooling structure 1 has oil cooling ducts 10a, 10b, 10c for supplying cooling oil from between the stator 3 and the frame 7 to the main body 40 of the coil end cover 4 in the rotating machine 2 shown in the figure. ..

油冷ダクト１０ａ，１０ｂ，１０ｃは、固定子３の外周部１４において固定子３（コイルエンドカバー４、回転子５、シャフト６）の軸方向に沿って形成されている。特に、油冷ダクト１０ａ，１０ｂは、図４の固定子３とフレーム７との間から、固定子３の軸方向に沿ってコイルエンドカバー４の本体部４０側に張り出して設けられている。 The oil cooling ducts 10a, 10b, and 10c are formed on the outer peripheral portion 14 of the stator 3 along the axial direction of the stator 3 (coil end cover 4, rotor 5, shaft 6). In particular, the oil cooling ducts 10a and 10b are provided so as to project from between the stator 3 and the frame 7 in FIG. 4 toward the main body 40 side of the coil end cover 4 along the axial direction of the stator 3.

また、油冷ダクト１０ａは、油冷ダクト１０ｂとは張り出し長さが異なる。例えば、油冷ダクト１０ａの張り出し長さＬａは、油冷ダクト１０ｂの張り出し長さＬｂよりも長く且つコイルエンドカバー４の軸方向長さＬｃの半分未満に設定される。 Further, the oil cooling duct 10a has a different overhang length from the oil cooling duct 10b. For example, the overhang length La of the oil cooling duct 10a is set to be longer than the overhang length Lb of the oil cooling duct 10b and less than half of the axial length Lc of the coil end cover 4.

以上の油冷ダクト１０ａ，１０ｂ，１０ｃは、固定子３の軸方向及び重力方向に沿う断面を対称に配置される。特に、図示の態様において、油冷ダクト１０ａは、油冷ダクト１０ｂよりも前記断面に近い位置において前記対称に配置形成されている。また、油冷ダクト１０ｃは、油冷ダクト１０ａ，１０ａ間、油冷ダクト１０ａ，１０ｂ間に配置形成されている。さらに、油冷ダクト１０ａ，１０ｂ，１０ｃの設置数及び油冷ダクト１０ａ，１０ｂの張り出し長さＬａ，Ｌｂは、コイルエンドカバー４の寸法に応じて適宜に設定される。 The oil cooling ducts 10a, 10b, and 10c described above are symmetrically arranged in cross sections along the axial direction and the gravity direction of the stator 3. In particular, in the illustrated embodiment, the oil-cooled ducts 10a are arranged and formed symmetrically at positions closer to the cross section than the oil-cooled ducts 10b. Further, the oil cooling ducts 10c are arranged and formed between the oil cooling ducts 10a and 10a and between the oil cooling ducts 10a and 10b. Further, the number of oil-cooled ducts 10a, 10b, 10c installed and the overhang lengths La, Lb of the oil-cooled ducts 10a, 10b are appropriately set according to the dimensions of the coil end cover 4.

以下、図１，２を参照してコイルエンド冷却構造１の作用とその効果について説明する。 Hereinafter, the operation of the coil end cooling structure 1 and its effect will be described with reference to FIGS. 1 and 2.

固定子３の軸方向の中間部位から導入された冷却油は、油冷ダクト１０ａ，１０ｂ，１０ｃから放物線状にコイルエンドカバー４の本体部４０側に流下する。前記冷却油は、例えば、コイルエンドカバー４の本体部４０の外周面に達した当該冷却油がコイルエンドカバー４の本体部４０の端部からはみ出ない程度の流速で供される。 The cooling oil introduced from the axially intermediate portion of the stator 3 flows down from the oil cooling ducts 10a, 10b, 10c in a parabolic shape to the main body 40 side of the coil end cover 4. The cooling oil is provided, for example, at a flow velocity such that the cooling oil that has reached the outer peripheral surface of the main body portion 40 of the coil end cover 4 does not protrude from the end portion of the main body portion 40 of the coil end cover 4.

本態様のコイルエンドカバー４における冷却油の流れの解析した結果を図２に示した。 The result of the analysis of the flow of the cooling oil in the coil end cover 4 of this embodiment is shown in FIG.

本解析に供したコイルエンドカバー４は、内径２８０ｍｍのフレーム７に対し、コイルエンドカバー４の外径は２２０ｍｍ、固定子３の端部からのコイルエンドカバー４の張り出し長さは１５０ｍｍとした。油冷ダクト１０ａは口径が１ｍｍ×１５ｍｍ及び張り出し長さＬａが２５ｍｍ、油冷ダクト１０ｂは口径が１ｍｍ×１５ｍｍ及び張り出し長さＬｂが２０ｍｍ、油冷ダクト１０ｃは口径が１ｍｍ×１５ｍｍである。冷却油は通常の工業油を用いた。冷却油の流速は０．５６［ｍ／ｓ］に設定された。本解析においては、コイルエンドカバー４の上方から片側５つの油冷ダクト（上流側から油冷ダクト１０ｃ，１０ａ，１０ｃ，１０ｂ，１０ｃ）からの流れを解析した。同図の結果から明らかなように、油冷ダクト１０ａ，１０ｂ，１０ｃから各々流れ出た冷却油は互いに干渉しないことがわかる。特に、冷却油が上流側から流れと大きく干渉していないことがわかる。さらに、冷却油のかかる領域がコイルエンドカバー４の端部まで及んでおり、図５に示された油冷ダクト１０ｃのみが形成された従来の冷却構造における冷却油のかかる領域よりも拡大することがわかる（尚、同図の解析条件は、コイルエンドカバー４に油冷ダクト１０ａ，１０ｂが設けられていないこと以外は、図２の解析条件と同じである）。 In the coil end cover 4 used in this analysis, the outer diameter of the coil end cover 4 was 220 mm and the overhang length of the coil end cover 4 from the end of the stator 3 was 150 mm with respect to the frame 7 having an inner diameter of 280 mm. The oil-cooled duct 10a has a diameter of 1 mm × 15 mm and an overhang length La of 25 mm, the oil-cooled duct 10b has a diameter of 1 mm × 15 mm and an overhang length Lb of 20 mm, and the oil-cooled duct 10c has a diameter of 1 mm × 15 mm. As the cooling oil, ordinary industrial oil was used. The flow rate of the cooling oil was set to 0.56 [m / s]. In this analysis, the flow from five oil-cooled ducts on one side (oil-cooled ducts 10c, 10a, 10c, 10b, 10c from the upstream side) from above the coil end cover 4 was analyzed. As is clear from the results in the figure, it can be seen that the cooling oils flowing out from the oil cooling ducts 10a, 10b, and 10c do not interfere with each other. In particular, it can be seen that the cooling oil does not significantly interfere with the flow from the upstream side. Further, the area where the cooling oil is applied extends to the end of the coil end cover 4, and is larger than the area where the cooling oil is applied in the conventional cooling structure in which only the oil cooling duct 10c shown in FIG. 5 is formed. (Note that the analysis conditions in the figure are the same as the analysis conditions in FIG. 2 except that the oil cooling ducts 10a and 10b are not provided in the coil end cover 4).

また、上述の冷却油の流れの解析結果から得られたコイルエンドの表面の熱伝達率をマッピングした結果を図３に示した。同図（ａ）は、従来技術のコイルエンドカバー４のマッピング結果を示す。同図（ｂ）は、本態様のコイルエンドカバー４のマッピング結果を示す。両者の結果において、局所的な熱伝達率熱に大きな違いは見られないが、本態様のコイルエンドカバー４のように、油冷ダクト１０ａ，１０ｂを有することで、熱伝達率がゼロ以上の範囲が広くなっていることがわかる。 Further, FIG. 3 shows the result of mapping the heat transfer coefficient on the surface of the coil end obtained from the above-mentioned analysis result of the cooling oil flow. FIG. (A) shows the mapping result of the coil end cover 4 of the prior art. FIG. 3B shows the mapping result of the coil end cover 4 of this embodiment. Although there is no significant difference in the local heat transfer coefficient heat between the two results, the heat transfer coefficient is zero or more by having the oil-cooled ducts 10a and 10b as in the coil end cover 4 of this embodiment. It can be seen that the range is wide.

さらに、両者の定量的な比較のために、コイルエンドカバー４の表面における熱伝達率の平均値を同図に示した。同図（ａ）の従来のコイルエンドカバー４における平均熱伝達率は１８．９［Ｗ／（ｍ2・Ｋ）］であった。一方、同図（ｂ）の本態様のコイルエンドカバー４における平均熱伝達率は２３．２［Ｗ／（ｍ2・Ｋ）］であった（尚、カッコ内の値は前記従来の平均熱伝達率との差である）。本態様のコイルエンドカバー４の平均熱伝達率は、従来のコイルエンドカバー４に比べて２３％大きいことがわかる。したがって、油冷ダクト１０ａ，１０ｂを適切に延長することでコイルエンドカバー４の冷却効率を任意に上げられることがわかる。 Further, for a quantitative comparison between the two, the average value of the heat transfer coefficient on the surface of the coil end cover 4 is shown in the figure. The average heat transfer coefficient of the conventional coil end cover 4 in FIG. 4A was 18.9 [W / (m 2 · K)]. On the other hand, the average heat transfer coefficient of the coil end cover 4 of the present embodiment in FIG. 6B was 23.2 [W / (m 2 · K)] (note that the values in parentheses are the conventional average heat). The difference from the transmission rate). It can be seen that the average heat transfer coefficient of the coil end cover 4 of this embodiment is 23% higher than that of the conventional coil end cover 4. Therefore, it can be seen that the cooling efficiency of the coil end cover 4 can be arbitrarily increased by appropriately extending the oil cooling ducts 10a and 10b.

以上のように、本態様のコイルエンド冷却構造１によれば、固定子３とフレーム７との間から供される冷却油によりコイルエンドカバー４を効率よく冷却できる。 As described above, according to the coil end cooling structure 1 of this embodiment, the coil end cover 4 can be efficiently cooled by the cooling oil provided between the stator 3 and the frame 7.

特に、固定子３の軸方向に沿ってコイルエンドカバー４の本体部４０側に張り出した複数の油冷ダクト１０ａ，１０ｂのうち、一方のいくつかの油冷ダクト１０ａは、他方のいくつかの油冷ダクト１０ｂとは張り出し長さが異なる。したがって、コイルエンドカバー４の周方向に隣り合う油冷ダクト１０ａ，１０ｂ，１０ｃから供された冷却油が、互いに干渉しなくなると共に、コイルエンドカバー４の軸方向に拡充して供されるので、コイルエンドカバー４が効率的に冷却される。 In particular, among the plurality of oil cooling ducts 10a and 10b protruding toward the main body 40 side of the coil end cover 4 along the axial direction of the stator 3, some of the oil cooling ducts 10a on one side are several on the other side. The overhang length is different from that of the oil cooling duct 10b. Therefore, the cooling oils provided from the oil cooling ducts 10a, 10b, and 10c adjacent to each other in the circumferential direction of the coil end cover 4 do not interfere with each other, and are expanded and provided in the axial direction of the coil end cover 4. The coil end cover 4 is efficiently cooled.

また、複数の油冷ダクト１０ａ，１０ｂは、固定子３の軸方向及び重力方向に沿う断面を対称に配置されることで、上記の効果に加えて、冷却油をコイルエンドカバー４の上半分側の外周部に均等に供給できる。 Further, the plurality of oil cooling ducts 10a and 10b are arranged symmetrically in cross sections along the axial direction and the gravity direction of the stator 3, so that in addition to the above effects, the cooling oil is applied to the upper half of the coil end cover 4. It can be evenly supplied to the outer peripheral portion on the side.

さらに、複数の油冷ダクト１０ａが前記断面寄りの位置において前記対称に配置されることで、上記の効果に加えて、特に、コイルエンドカバー４の端部寄りの上半分側の外周部に均等に供給できる。 Further, by arranging the plurality of oil cooling ducts 10a symmetrically at the positions near the cross section, in addition to the above effects, in particular, the coil end cover 4 is evenly distributed on the outer peripheral portion on the upper half side near the end portion. Can be supplied to.

そして、油冷ダクト１０ａは、その張り出し長さがコイルエンドカバー４の軸方向長さの半分未満に設定されることで、上記の効果に加えて、冷却油の供給制御により、油冷ダクト１０ａから放物線状に供される冷却油の流れを任意に調整できる。 Then, the overhang length of the oil cooling duct 10a is set to less than half of the axial length of the coil end cover 4, and in addition to the above effects, the oil cooling duct 10a is controlled by the supply control of the cooling oil. The flow of the cooling oil supplied in a parabolic shape can be adjusted arbitrarily.

また、冷却油は、コイルエンドカバー４の外周面に達した冷却油がコイルエンドカバー４の端部からはみ出ない程度の流速で供されることで、上記の効果に加えて、コイルエンドカバー４に対して冷却油を無駄なく供給できる。 Further, the cooling oil is provided at a flow velocity such that the cooling oil that has reached the outer peripheral surface of the coil end cover 4 does not protrude from the end portion of the coil end cover 4, so that in addition to the above effects, the coil end cover 4 Cooling oil can be supplied without waste.

１…冷却構造
２…回転機
３…固定子
４…コイルエンドカバー、４０…本体部
５…回転子
６…シャフト
７…フレーム
１０ａ，１０ｂ，１０ｃ…油冷ダクト
Ｌａ…油冷ダクト１０ａの張り出し長さ
Ｌｂ…油冷ダクト１０ｂの張り出し長さ
Ｌｃ…コイルエンドカバー４の軸方向長さ 1 ... Cooling structure 2 ... Rotor 3 ... Stator 4 ... Coil end cover, 40 ... Main body 5 ... Rotor 6 ... Shaft 7 ... Frames 10a, 10b, 10c ... Oil cooling duct La ... Oil cooling duct 10a overhang length Lb ... Overhang length of the oil cooling duct 10b Lc ... Axial length of the coil end cover 4

Claims (5)

油冷式の回転機のコイルエンド冷却構造であって、
前記回転機の固定子とフレームとの間から冷却油をコイルエンドカバーの本体部に供する複数の油冷ダクトを有し、
前記複数の油冷ダクトのうち、いくつかの油冷ダクトは、前記固定子と前記フレームと間から前記固定子の軸方向に沿って前記本体部側に張り出して設けられ、
前記いくつかの油冷ダクトのうち、一方のいくつかの油冷ダクトは、他方のいくつかの油冷ダクトとは張り出し長さが異なること
を特徴とするコイルエンド冷却構造。 It is a coil end cooling structure of an oil-cooled rotary machine.
It has a plurality of oil cooling ducts that supply cooling oil to the main body of the coil end cover from between the stator of the rotary machine and the frame.
Among the plurality of oil cooling ducts, some oil cooling ducts are provided so as to project from between the stator and the frame toward the main body along the axial direction of the stator.
A coil end cooling structure, wherein some of the several oil cooling ducts have a different overhang length from some of the other oil cooling ducts. 前記複数の油冷ダクトは、前記固定子の軸方向及び重力方向に沿う断面を対称に配置されることを特徴とする請求項１に記載のコイルエンド冷却構造。 The coil end cooling structure according to claim 1, wherein the plurality of oil cooling ducts are symmetrically arranged in cross sections along the axial direction and the gravity direction of the stator. 前記一方のいくつかの油冷ダクトは、前記他方のいくつかの油冷ダクトよりも前記断面に近い位置において前記対称に配置されることを特徴とする請求項２に記載のコイルエンド冷却構造。 The coil end cooling structure according to claim 2, wherein the one oil-cooled duct is arranged symmetrically at a position closer to the cross section than the other oil-cooled duct. 前記一方のいくつかの油冷ダクトは、その張り出し長さが前記コイルエンドカバーの軸方向長さの半分未満であることを特徴とする請求項３に記載のコイルエンド冷却構造。 The coil end cooling structure according to claim 3, wherein some of the oil cooling ducts have an overhang length of less than half the axial length of the coil end cover. 前記冷却油は、前記コイルエンドカバーの外周面に達した当該冷却油が当該コイルエンドカバーの端部からはみ出ない程度の流速で供されることを特徴とする請求項１から４のいずれか１項に記載のコイルエンド冷却構造。 The cooling oil is any one of claims 1 to 4, wherein the cooling oil that has reached the outer peripheral surface of the coil end cover is provided at a flow velocity such that the cooling oil does not protrude from the end portion of the coil end cover. The coil end cooling structure described in the section.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012222904A (en) * 2011-04-06 2012-11-12 Toyota Motor Corp Distributed winding rotary electric machine
JP2019030098A (en) * 2017-07-28 2019-02-21 トヨタ自動車株式会社 Stator
JP2019088116A (en) * 2017-11-08 2019-06-06 タイガースポリマー株式会社 Refrigeration structure of dynamo-electric machine
JP2019161948A (en) * 2018-03-15 2019-09-19 本田技研工業株式会社 Rotary electric machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012222904A (en) * 2011-04-06 2012-11-12 Toyota Motor Corp Distributed winding rotary electric machine
JP2019030098A (en) * 2017-07-28 2019-02-21 トヨタ自動車株式会社 Stator
JP2019088116A (en) * 2017-11-08 2019-06-06 タイガースポリマー株式会社 Refrigeration structure of dynamo-electric machine
JP2019161948A (en) * 2018-03-15 2019-09-19 本田技研工業株式会社 Rotary electric machine

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