WO2021131182A1 - Cooling structure of rotary electric machine - Google Patents

Cooling structure of rotary electric machine Download PDF

Info

Publication number
WO2021131182A1
WO2021131182A1 PCT/JP2020/035498 JP2020035498W WO2021131182A1 WO 2021131182 A1 WO2021131182 A1 WO 2021131182A1 JP 2020035498 W JP2020035498 W JP 2020035498W WO 2021131182 A1 WO2021131182 A1 WO 2021131182A1
Authority
WO
WIPO (PCT)
Prior art keywords
refrigerant
electric machine
guide
rotary electric
bracket
Prior art date
Application number
PCT/JP2020/035498
Other languages
French (fr)
Japanese (ja)
Inventor
拓 植松
洸太 塩谷
Original Assignee
株式会社明電舎
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 株式会社明電舎 filed Critical 株式会社明電舎
Priority to JP2020554923A priority Critical patent/JP6881692B1/en
Priority to CN202080085886.8A priority patent/CN114788147B/en
Publication of WO2021131182A1 publication Critical patent/WO2021131182A1/en

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil

Definitions

  • the present invention relates to a cooling structure of a rotary electric machine.
  • the rotary electric machine is equipped with a cooling structure that uses a refrigerant such as cooling oil as a measure against heat generation.
  • a cooling structure for example, a method of injecting a refrigerant from above the coil end of the stator from the outer diameter direction of the coil end (Patent Document 1), or a method of injecting the refrigerant in the axial direction of the rotary electric machine from a position corresponding to the coil end.
  • Patent Document 2 A method using a spraying oil guide
  • the refrigerant is injected from above the coil end, and the refrigerant is supplied downward using the coil end as a transmission path.
  • the refrigerant flows down by gravity, a short-circuit flow is likely to occur and the coil end. Oil may not be transmitted to the bottom of the coil, resulting in poor cooling efficiency.
  • a cooling structure equipped with an oil guide as in Patent Document 2 requires securing a space for arranging the oil guide, which leads to an increase in the size of the motor and an increase in the number of parts, resulting in an increase in manufacturing cost.
  • one aspect of the present invention is a bracket having a cooling structure for a rotary electric machine, which can seal an opening of a frame accommodating a stator of the rotary electric machine and supply a refrigerant to the coil end of the stator. It has a refrigerant guide member capable of guiding the refrigerant provided from the bracket to the coil end below the rotation shaft of the rotary electric machine.
  • the refrigerant guide member is a long plate-shaped guide main body that guides the refrigerant provided along the inner surface portion of the bracket to the lower side of the rotary shaft. Has a part.
  • the first guide in the cooling structure of the rotary electric machine, the first guide assist that guides the refrigerant from one end side of the guide main body portion downward to the edge portion along the longitudinal direction of the guide main body portion.
  • the department is further erected.
  • the refrigerant provided in the vicinity of the rotary shaft along the inner surface portion is further applied to the upper surface portion of the guide main body portion from the rotary shaft.
  • a second guide auxiliary portion that guides the lower coil end is further erected.
  • the upper surface portion of the guide main body portion provided with the second guide auxiliary portion is the upper surface portion of the guide main body portion provided with the first guide auxiliary portion.
  • the overhang length from the inner surface portion is larger than that of the inner surface portion.
  • the upper surface portion of the guide main body portion is inclined toward the coil end below the guide body portion.
  • the refrigerant guide member is attached to the inner surface portion of the bracket.
  • the cooling effect of the coil end in the rotary electric machine can be improved at low cost.
  • FIG. 1 is a perspective view of the bracket of FIG.
  • FIG. 4 is a perspective view from the directly connected side of the rotary electric machine of FIG. Top view of the refrigerant guide member according to the embodiment of the present invention.
  • the rotary electric machine 1 of the present embodiment to which the cooling mechanism according to one aspect of the present invention is applied is mounted on a vehicle, for example, and has a rotary shaft 2, a rotor 3, a stator 4, and a refrigerant shown in FIGS. 1 to 6. It includes a guide member 5 and a casing 6.
  • the rotating shaft 2 is rotatably supported in the casing 6 of the rotating electric machine 1 via bearings 7 and 8.
  • the rotor 3 is fixed to the outer peripheral portion of the rotating shaft 2 in the casing 6.
  • the stator 4 is fixed in the casing 6 coaxially with the rotating shaft 2 and the rotor 3 so that an air gap with the outer peripheral portion of the rotor 3 is secured.
  • the stator 4 includes a stator core 41 and a stator coil 42.
  • the stator coil 42 is composed of a plurality of segment coils (not shown) wound around the stator core 41. A part of the stator coil 42 projects as coil ends 42A and 42B from the ends of the stator core 41 on the anti-direct connection side and the direct connection side of the rotary electric machine 1. Further, a bus bar (not shown) is connected to the stator coil 42.
  • the refrigerant guide member 5 can guide the refrigerant (for example, cooling oil) provided from the bracket 61 of the casing 6 to the coil end 42A below the rotation shaft 2 of the rotary electric machine 1.
  • refrigerant for example, cooling oil
  • the refrigerant guide member 5 has a guide main body portion 50, a first guide auxiliary portion 51, a second guide auxiliary portion 52, and a mounting portion 53.
  • the guide main body 50 is composed of a long plate-shaped member that guides the refrigerant provided along the inner surface 61a of the bracket 61 facing the coil end 42A downward.
  • the upper surface portion 54 of the guide main body portion 50 is inclined toward the lower coil end 42A.
  • the first guide auxiliary portion 51 is erected at an edge portion along the longitudinal direction of the guide main body portion 50, and guides the refrigerant from one end side of the guide main body portion 50 to the lower side.
  • a plurality of pairs of the second guide auxiliary portions 52 are erected diagonally with respect to the longitudinal direction of the upper surface portion 54 of the guide main body portion 50, and rotate along the inner surface portion 61a of the bracket 61 as shown in FIGS.
  • the refrigerant provided in the vicinity of the shaft 2 is further guided from the rotating shaft 2 to the lowermost coil end 42A.
  • the upper surface portion 54 of the guide main body portion 50 provided with the second guide auxiliary portion 52 is larger than the upper surface portion 54 of the guide main body portion 50 provided with the first guide auxiliary portion 51.
  • the overhang length from the inner surface portion 61a is set large (D2> D1).
  • the mounting portion 53 is fixed to a position below the bearing support portion 66 on the inner surface portion 61a of the bracket 61 by fasteners (not shown) such as bolts and nuts.
  • the casing 6 includes a frame 60, a bracket 61 on the anti-direct connection side of the rotary electric machine 1, and a bracket (not shown) on the direct connection side of the rotary electric machine 1.
  • the frame 60 accommodates the rotating shaft 2, the rotor 3, and the stator 4.
  • a refrigerant introduction path 62a is formed on the outer surface of the frame 60 substantially parallel to the axial direction of the rotary electric machine 1 (rotary shaft 2, rotor 3 and stator 4).
  • the refrigerant introduction path 62a introduces the refrigerant from the outside and provides the refrigerant introduction path 62b of the bracket 61 and the refrigerant introduction path (not shown) of the bracket on the directly connected side.
  • a discharge port 62c for discharging the refrigerant used for cooling the coil ends 42A and 42B is formed on the side surface portion of the frame 60 near the lower end on the directly connected side.
  • the bracket 61 is made of, for example, a die-cast aluminum alloy product, and seals the opening of the frame 60 on the anti-direct connection side.
  • the bracket 61 is formed with a refrigerant introduction path 62b, a first inflow hole 63, and a second inflow hole 64.
  • the refrigerant introduction path 62b is formed parallel to the axial direction of the rotary electric machine 1 and communicates with the refrigerant introduction path 62a of the frame 60.
  • the first inflow hole 63 allows the refrigerant in the refrigerant introduction path 62b to flow into the bracket 61 along the radial direction of the coil end 42A.
  • the second inflow holes 64 are formed in pairs symmetrically with the first inflow holes 63, and the refrigerant in the refrigerant introduction path 62b flows into the bracket 61 along the outer peripheral direction of the coil end 42A.
  • the bus bar of the stator 4 projecting from the anti-direct connection side is projected and pulled out from the back surface portion 61b of the bracket 61.
  • the bracket 61 is formed with a connection port 65 from which an electric wire for connecting the stator 4 and a drive control system (not shown) is drawn out.
  • a bearing support portion 66 for supporting the bearing 7 on the anti-direct connection side of the rotating shaft 2 is provided on the peripheral edge of the central opening portion 61c in the inner surface portion 61a of the bracket 61.
  • the bearing support portion 66 is formed with a refrigerant introduction groove 67 that introduces the refrigerant from the first inflow hole 63 and supplies it to the bearing 7.
  • the inner surface portion 61a is provided with a pair of guide portions 68 for guiding the refrigerant to the refrigerant introduction groove 67.
  • an outlet 69 for cooling the back surface portion 61b of the bracket 61 is formed between the bearing support portion 66 and the refrigerant guide member 5.
  • the back surface portion 61b of the bracket 61 is provided with a rotation angle sensor 9 at one end 21 of the rotation shaft 2 protruding from the bearing support portion 66.
  • the bracket on the direct connection side seals the opening of the frame 60 on the direct connection side shown in FIG.
  • the bracket has the same mode as the bracket 61 except that it does not have the connection port 65 and the rotation angle sensor 9. Further, the other end 22 of the rotating shaft 2 on the directly connected side protrudes from the central portion of the bracket on the directly connected side.
  • the bracket also includes a refrigerant guide member (not shown) having the same aspect as the refrigerant guide member 5 capable of guiding the refrigerant supplied from the frame 60 to the coil end 42B below the rotary shaft 2 of the rotary electric machine 1. Will be done.
  • the refrigerant introduced into the refrigerant introduction path 62b of the bracket 61 via the refrigerant introduction path 62a of the frame 60 by pumping flows into the bracket 61 through the first inflow hole 63 and the second inflow hole 64.
  • the refrigerant that has flowed in from the first inflow hole 63 flows down by gravity along the inner surface portion 61a of the bracket 61.
  • the refrigerant flowing down along the inner surface portion 61a is guided by the guide portion 68, shifts to the refrigerant introduction groove 67, and is provided to the bearing 7.
  • the refrigerant flowing in from the second inflow hole 64 flows down by gravity along the inner peripheral direction of the inner surface portion 61a.
  • a part of the refrigerant flowing down in the inner peripheral direction is used for cooling the coil end 42A of the stator 4 above the rotating shaft 2. Further, the other part of the refrigerant flows down to the refrigerant guide member 5 side along the inner surface portion 61a. Further, the refrigerant that has flowed down to the first guide auxiliary portion 51 side of the refrigerant guide member 5 flows down toward the second guide auxiliary portion 52 along the longitudinal direction of the guide main body portion 50 by the guidance of the first guide auxiliary portion 51. To do.
  • the refrigerant flowing down from the vicinity of the bearing support portion 66 (rotary shaft 2, bearing 7) to the second guide auxiliary portion 52 side is guided from the rotary shaft 2 to the lowermost coil end 42A by the guidance of the second guide auxiliary portion 52. Served towards.
  • the coil end 42A is uniformly cooled.
  • a part of the refrigerant flowing down from the bearing support portion 66 side to the refrigerant guide member 5 moves to the back surface portion 61b side of the bracket 61 via the outflow port 69 and is used for cooling the back surface portion 61b.
  • the coil end 42B in the bracket on the directly connected side is also uniformly cooled by receiving the same supply of the refrigerant as the coil end 42A in the bracket 61. Then, the refrigerant used for cooling the coil ends 42A and 42B is discharged from the discharge port 62c of the frame 60.
  • the refrigerant introduced into the frame 60 is supplied to the predetermined portions of the coil ends 42A and 42B in the frame 60 by the guidance of the refrigerant guide member 5.
  • the refrigerant guide member 5 it is possible to supply the refrigerant to a portion below the rotating shaft 2, which has been insufficiently cooled in the past, particularly to the lowermost portion of the coil ends 42A and 42B.
  • a margin can be provided in the current density, so that the rotary electric machine 1 can be miniaturized. Therefore, the cooling effect of the coil ends 42A and 42B in the rotary electric machine 1 can be improved at low cost.
  • brackets on the anti-direct connection side and the direct connection side to which the refrigerant guide member 5 is attached are made of an alloy having high heat dissipation, for example, an aluminum alloy, the refrigerant is cooled in the process of being supplied to the refrigerant guide member 5. , The cooling effect is further enhanced.
  • the refrigerant guide member 5 since the refrigerant provided along the inner surface portion of the bracket is guided downward by the long plate-shaped guide main body portion 50, the refrigerant is transferred to the lower side of the rotation shaft 2. it can.
  • the first guide auxiliary portion 51 is further erected at the edge portion along the longitudinal direction of the guide main body portion 50, so that the refrigerant is guided downward from one end side of the guide main body portion 50. Can be reliably moved downward.
  • the second guide auxiliary portion 52 is further erected on the upper surface portion of the guide main body portion 50, the refrigerant provided in the vicinity of the rotation shaft 2 along the inner surface portion is placed at the lowermost position from the rotation shaft 2. It can be supplied toward the coil ends 42A and 42B.
  • the upper surface portion of the guide main body 50 provided with the second guide auxiliary portion 52 has a larger overhang length from the inner surface portion than the upper surface portion of the guide main body 50 provided with the first guide auxiliary portion 51.
  • the upper surface portion of the guide main body portion 50 is arranged so as to be inclined toward the lower coil ends 42A and 42B, so that the second guide auxiliary portion 52 projects toward the lowermost coil ends 42A and 42B. Is done. Therefore, the effect of supplying the refrigerant to the lowermost coil ends 42A and 42B is further enhanced.
  • the refrigerant guide member 5 is attached to the inner surface portion 61a of the bracket 61, the cooling effect of the refrigerant guide member 5 is enhanced by heat conduction between the bracket 61 and the refrigerant guide member 5, so that the lower coil end 42A , 42B cooling effect is further enhanced.

Abstract

In a cooling structure of a rotary electric machine 1, a bracket 61 seals the opening of a frame 60 accommodating a stator 4 of the rotary electric machine 1 and can supply a refrigerant to the coil end of the stator 4. A refrigerant guide member 5 can guide the refrigerant provided from the bracket 61 to the coil end below the rotating shaft of the rotary electric machine 1. In the refrigerant guide member 5, a guide main body 50 guides the refrigerant provided along an inner surface portion 61a of the bracket 61 downward.

Description

回転電機の冷却構造Cooling structure of rotary electric machine
　本発明は、回転電機の冷却構造に関する。 The present invention relates to a cooling structure of a rotary electric machine.
　回転電機においては発熱対策として冷却油等の冷媒を用いた冷却構造が備えられている。冷却構造としては、例えば、固定子のコイルエンドの上方から当該コイルエンドの外径方向から冷媒を噴射する方式（特許文献１）や、コイルエンドに対応した位置から回転電機の軸方向に冷媒を噴射するオイルガイドを用いた方式（特許文献２）が採用されている。 The rotary electric machine is equipped with a cooling structure that uses a refrigerant such as cooling oil as a measure against heat generation. As a cooling structure, for example, a method of injecting a refrigerant from above the coil end of the stator from the outer diameter direction of the coil end (Patent Document 1), or a method of injecting the refrigerant in the axial direction of the rotary electric machine from a position corresponding to the coil end. A method using a spraying oil guide (Patent Document 2) is adopted.
特開２００６－１１５６５１号公報Japanese Unexamined Patent Publication No. 2006-115651 特許第６４３６２００号公報Japanese Patent No. 6436200
　特許文献１のような冷却構造は、コイルエンドの上方から冷媒が噴射され、コイルエンドを伝達経路として下方に冷媒が供されるが、冷媒が重力流下するので、短絡流が生じやすく、コイルエンドの最下部に油が伝達されないことがあり、冷却効率が悪くなる。 In a cooling structure as in Patent Document 1, the refrigerant is injected from above the coil end, and the refrigerant is supplied downward using the coil end as a transmission path. However, since the refrigerant flows down by gravity, a short-circuit flow is likely to occur and the coil end. Oil may not be transmitted to the bottom of the coil, resulting in poor cooling efficiency.
　また、特許文献２のようなオイルガイドを備えた冷却構造は、オイルガイドの配置空間の確保を要し、モータサイズの大型化や部品点数の増加を招き、製造コストが高くなる。 In addition, a cooling structure equipped with an oil guide as in Patent Document 2 requires securing a space for arranging the oil guide, which leads to an increase in the size of the motor and an increase in the number of parts, resulting in an increase in manufacturing cost.
　本発明は、以上の事情を鑑み、低コストに回転電機におけるコイルエンドの冷却効果の向上を図ることを課題とする。 In view of the above circumstances, it is an object of the present invention to improve the cooling effect of the coil end in the rotary electric machine at low cost.
　そこで、本発明の一態様は、回転電機の冷却構造であって、回転電機の固定子を収容するフレームの開口部を密閉すると共に当該固定子のコイルエンドに冷媒を供給可能なブラケットと、このブラケットから供された前記冷媒を前記回転電機の回転軸よりも下方の前記コイルエンドに案内可能な冷媒案内部材とを有する。 Therefore, one aspect of the present invention is a bracket having a cooling structure for a rotary electric machine, which can seal an opening of a frame accommodating a stator of the rotary electric machine and supply a refrigerant to the coil end of the stator. It has a refrigerant guide member capable of guiding the refrigerant provided from the bracket to the coil end below the rotation shaft of the rotary electric machine.
　本発明の他の態様は、前記回転電機の冷却構造において、前記冷媒案内部材は、前記ブラケットの内面部に沿って供された前記冷媒を前記回転軸の下方に案内する長板状の案内本体部を有する。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the refrigerant guide member is a long plate-shaped guide main body that guides the refrigerant provided along the inner surface portion of the bracket to the lower side of the rotary shaft. Has a part.
　本発明の他の態様は、前記回転電機の冷却構造において、前記案内本体部の長手方向に沿う縁部には、前記冷媒を当該案内本体部の一端側から前記下方に案内する第一案内補助部がさらに立設される。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the first guide assist that guides the refrigerant from one end side of the guide main body portion downward to the edge portion along the longitudinal direction of the guide main body portion. The department is further erected.
　本発明の他の態様は、前記回転電機の冷却構造において、前記案内本体部の上面部には、前記内面部に沿って前記回転軸の付近に供された前記冷媒をさらに当該回転軸から最下方の前記コイルエンドに案内する第二案内補助部がさらに立設される。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the refrigerant provided in the vicinity of the rotary shaft along the inner surface portion is further applied to the upper surface portion of the guide main body portion from the rotary shaft. A second guide auxiliary portion that guides the lower coil end is further erected.
　本発明の他の態様は、前記回転電機の冷却構造において、前記第二案内補助部が設けられる前記案内本体部の上面部は、前記第一案内補助部が設けられる前記案内本体部の上面部よりも、前記内面部からの張り出し長さが大きい。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the upper surface portion of the guide main body portion provided with the second guide auxiliary portion is the upper surface portion of the guide main body portion provided with the first guide auxiliary portion. The overhang length from the inner surface portion is larger than that of the inner surface portion.
　本発明の他の態様は、前記回転電機の冷却構造において、前記案内本体部の上面部は、前記下方の前記コイルエンドに向けて傾斜する。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the upper surface portion of the guide main body portion is inclined toward the coil end below the guide body portion.
　本発明の他の態様は、前記回転電機の冷却構造において、前記冷媒案内部材は、前記ブラケットの内面部に取り付けられる。 In another aspect of the present invention, in the cooling structure of the rotary electric machine, the refrigerant guide member is attached to the inner surface portion of the bracket.
　以上の本発明によれば、低コストに回転電機におけるコイルエンドの冷却効果の向上が図られる。 According to the above invention, the cooling effect of the coil end in the rotary electric machine can be improved at low cost.
本発明の実施形態における冷媒案内部材が取り付けられたブラケットの正面図。The front view of the bracket to which the refrigerant guide member in embodiment of this invention is attached. 図１のブラケットの斜視図。FIG. 1 is a perspective view of the bracket of FIG. 本発明の実施形態における冷媒案内部材と回転電機の回転軸、回転子、固定子、コイルエンド及びフレームとの位置関係を示した斜視図。The perspective view which showed the positional relationship between the refrigerant guide member and the rotary shaft, the rotor, the stator, the coil end and the frame of the rotary electric machine in embodiment of this invention. 本発明の実施形態における回転電機の反直結側からの斜視図。The perspective view from the anti-direct connection side of the rotary electric machine in embodiment of this invention. 図４の回転電機の直結側からの斜視図。FIG. 4 is a perspective view from the directly connected side of the rotary electric machine of FIG. 本発明の実施形態における冷媒案内部材の上面図。Top view of the refrigerant guide member according to the embodiment of the present invention.
　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.
　本発明の一態様である冷却機構が適用された本実施形態の回転電機１は、例えば、車両に搭載され、図１～６に示された回転軸２、回転子３、固定子４、冷媒案内部材５及びケーシング６を備える。 The rotary electric machine 1 of the present embodiment to which the cooling mechanism according to one aspect of the present invention is applied is mounted on a vehicle, for example, and has a rotary shaft 2, a rotor 3, a stator 4, and a refrigerant shown in FIGS. 1 to 6. It includes a guide member 5 and a casing 6.
　回転軸２は、図３，５に示されたように、回転電機１のケーシング６内にて軸受７，８を介して回転自在に支持される。回転子３は、ケーシング６内にて回転軸２の外周部に固定される。 As shown in FIGS. 3 and 5, the rotating shaft 2 is rotatably supported in the casing 6 of the rotating electric machine 1 via bearings 7 and 8. The rotor 3 is fixed to the outer peripheral portion of the rotating shaft 2 in the casing 6.
　固定子４は、同図に示したように、回転子３の外周部とのエアギャップが確保されて回転軸２及び回転子３と同軸にケーシング６内に固定される。固定子４は、固定子鉄心４１及び固定子コイル４２を備える。固定子コイル４２は、固定子鉄心４１に巻着される図示省略した複数のセグメントコイルからなる。そして、回転電機１の反直結側，直結側における固定子鉄心４１の端部からは、固定子コイル４２の一部がコイルエンド４２Ａ，４２Ｂとして各々突出している。また、固定子コイル４２には、図示省略のバスバーが接続されている。 As shown in the figure, the stator 4 is fixed in the casing 6 coaxially with the rotating shaft 2 and the rotor 3 so that an air gap with the outer peripheral portion of the rotor 3 is secured. The stator 4 includes a stator core 41 and a stator coil 42. The stator coil 42 is composed of a plurality of segment coils (not shown) wound around the stator core 41. A part of the stator coil 42 projects as coil ends 42A and 42B from the ends of the stator core 41 on the anti-direct connection side and the direct connection side of the rotary electric machine 1. Further, a bus bar (not shown) is connected to the stator coil 42.
　冷媒案内部材５は、ケーシング６のブラケット６１から供された冷媒（例えば、冷却油）を回転電機１の回転軸２よりも下方のコイルエンド４２Ａに案内可能となっている。 The refrigerant guide member 5 can guide the refrigerant (for example, cooling oil) provided from the bracket 61 of the casing 6 to the coil end 42A below the rotation shaft 2 of the rotary electric machine 1.
　冷媒案内部材５は、具体的な態様として、案内本体部５０、第一案内補助部５１及び第二案内補助部５２と取り付け部５３とを有する。 As a specific embodiment, the refrigerant guide member 5 has a guide main body portion 50, a first guide auxiliary portion 51, a second guide auxiliary portion 52, and a mounting portion 53.
　案内本体部５０は、コイルエンド４２Ａと対向するブラケット６１の内面部６１ａに沿って供された前記冷媒を前記下方に案内する長板状の部材から成る。案内本体部５０の上面部５４は、前記下方のコイルエンド４２Ａに向けて傾斜している。 The guide main body 50 is composed of a long plate-shaped member that guides the refrigerant provided along the inner surface 61a of the bracket 61 facing the coil end 42A downward. The upper surface portion 54 of the guide main body portion 50 is inclined toward the lower coil end 42A.
　第一案内補助部５１は、案内本体部５０の長手方向に沿う縁部にて立設され、前記冷媒を案内本体部５０の一端側から前記下方に案内する。 The first guide auxiliary portion 51 is erected at an edge portion along the longitudinal direction of the guide main body portion 50, and guides the refrigerant from one end side of the guide main body portion 50 to the lower side.
　第二案内補助部５２は、案内本体部５０の上面部５４の長手方向に対して斜めに複数一対に立設され、図２，３に示したようにブラケット６１の内面部６１ａに沿って回転軸２の付近に供された前記冷媒をさらに回転軸２から最下方のコイルエンド４２Ａに案内する。また、図６に示されたように、第二案内補助部５２が設けられる案内本体部５０の上面部５４は、第一案内補助部５１が設けられる案内本体部５０の上面部５４よりも、内面部６１ａからの張り出し長さが大きく設定される（Ｄ２＞Ｄ１）。 A plurality of pairs of the second guide auxiliary portions 52 are erected diagonally with respect to the longitudinal direction of the upper surface portion 54 of the guide main body portion 50, and rotate along the inner surface portion 61a of the bracket 61 as shown in FIGS. The refrigerant provided in the vicinity of the shaft 2 is further guided from the rotating shaft 2 to the lowermost coil end 42A. Further, as shown in FIG. 6, the upper surface portion 54 of the guide main body portion 50 provided with the second guide auxiliary portion 52 is larger than the upper surface portion 54 of the guide main body portion 50 provided with the first guide auxiliary portion 51. The overhang length from the inner surface portion 61a is set large (D2> D1).
　取り付け部５３は、図２に示したように、ボルト，ナット等の締結具（図示省略）によりブラケット６１の内面部６１ａにおける軸受支持部６６の下方の位置に固定される。 As shown in FIG. 2, the mounting portion 53 is fixed to a position below the bearing support portion 66 on the inner surface portion 61a of the bracket 61 by fasteners (not shown) such as bolts and nuts.
　ケーシング６は、図４，５に示したように、フレーム６０と、回転電機１の反直結側のブラケット６１と、回転電機１の直結側のブラケット（図示省略）とを備える。 As shown in FIGS. 4 and 5, the casing 6 includes a frame 60, a bracket 61 on the anti-direct connection side of the rotary electric machine 1, and a bracket (not shown) on the direct connection side of the rotary electric machine 1.
　フレーム６０は、回転軸２、回転子３及び固定子４を収容する。フレーム６０の外面部には、冷媒導入路６２ａが回転電機１（回転軸２、回転子３及び固定子４）の軸方向と略平行に形成されている。冷媒導入路６２ａは外部から前記冷媒を導入してブラケット６１の冷媒導入路６２ｂ及び前記直結側のブラケットの冷媒導入路（図示省略）に供する。また、フレーム６０の前記直結側の下端付近における側面部には、コイルエンド４２Ａ，４２Ｂの冷却に供された冷媒が排出される排出口６２ｃが形成されている。 The frame 60 accommodates the rotating shaft 2, the rotor 3, and the stator 4. A refrigerant introduction path 62a is formed on the outer surface of the frame 60 substantially parallel to the axial direction of the rotary electric machine 1 (rotary shaft 2, rotor 3 and stator 4). The refrigerant introduction path 62a introduces the refrigerant from the outside and provides the refrigerant introduction path 62b of the bracket 61 and the refrigerant introduction path (not shown) of the bracket on the directly connected side. Further, a discharge port 62c for discharging the refrigerant used for cooling the coil ends 42A and 42B is formed on the side surface portion of the frame 60 near the lower end on the directly connected side.
　ブラケット６１は、図４，５に示されたように、例えば、アルミ合金のダイカスト成形品から成り、前記反直結側のフレーム６０の開口部を密閉する。 As shown in FIGS. 4 and 5, the bracket 61 is made of, for example, a die-cast aluminum alloy product, and seals the opening of the frame 60 on the anti-direct connection side.
　図１，２に示したように、ブラケット６１には、冷媒導入路６２ｂ、第一流入孔６３、第二流入孔６４が形成されている。冷媒導入路６２ｂは、回転電機１の軸方向と平行に形成され、フレーム６０の冷媒導入路６２ａと連通する。第一流入孔６３は、冷媒導入路６２ｂ内の冷媒をコイルエンド４２Ａの径方向に沿ってブラケット６１内に流入させる。第二流入孔６４は、第一流入孔６３を対称に一対に形成され、冷媒導入路６２ｂ内の冷媒をコイルエンド４２Ａの外周方向に沿ってブラケット６１内に流入させる。また、ブラケット６１の背面部６１ｂからは、前記反直結側に突設された固定子４のバスバーが突出して引き出される。さらに、ブラケット６１には、固定子４と図示省略の駆動制御系とを接続する電線が引き出される接続口６５が形成されている。 As shown in FIGS. 1 and 2, the bracket 61 is formed with a refrigerant introduction path 62b, a first inflow hole 63, and a second inflow hole 64. The refrigerant introduction path 62b is formed parallel to the axial direction of the rotary electric machine 1 and communicates with the refrigerant introduction path 62a of the frame 60. The first inflow hole 63 allows the refrigerant in the refrigerant introduction path 62b to flow into the bracket 61 along the radial direction of the coil end 42A. The second inflow holes 64 are formed in pairs symmetrically with the first inflow holes 63, and the refrigerant in the refrigerant introduction path 62b flows into the bracket 61 along the outer peripheral direction of the coil end 42A. Further, the bus bar of the stator 4 projecting from the anti-direct connection side is projected and pulled out from the back surface portion 61b of the bracket 61. Further, the bracket 61 is formed with a connection port 65 from which an electric wire for connecting the stator 4 and a drive control system (not shown) is drawn out.
　また、ブラケット６１の内面部６１ａにおける中央開口部６１ｃの周縁には、回転軸２の前記反直結側の軸受７を支持する軸受支持部６６が設けられている。軸受支持部６６には、第一流入孔６３からの冷媒を導入して軸受７に供する冷媒導入溝６７が形成されている。さらに、内面部６１ａには、前記冷媒を冷媒導入溝６７に案内する一対の案内部６８が設けられている。また、軸受支持部６６と冷媒案内部材５との間には、前記冷媒をブラケット６１の背面部６１ｂの冷却に供する流出口６９が形成されている。 Further, a bearing support portion 66 for supporting the bearing 7 on the anti-direct connection side of the rotating shaft 2 is provided on the peripheral edge of the central opening portion 61c in the inner surface portion 61a of the bracket 61. The bearing support portion 66 is formed with a refrigerant introduction groove 67 that introduces the refrigerant from the first inflow hole 63 and supplies it to the bearing 7. Further, the inner surface portion 61a is provided with a pair of guide portions 68 for guiding the refrigerant to the refrigerant introduction groove 67. Further, an outlet 69 for cooling the back surface portion 61b of the bracket 61 is formed between the bearing support portion 66 and the refrigerant guide member 5.
　そして、図４に示されたように、ブラケット６１の背面部６１ｂには、軸受支持部６６から突出した回転軸２の一端２１に回転角センサ９が具備される。 Then, as shown in FIG. 4, the back surface portion 61b of the bracket 61 is provided with a rotation angle sensor 9 at one end 21 of the rotation shaft 2 protruding from the bearing support portion 66.
　前記直結側のブラケットは、図５に示された直結側のフレーム６０の開口部を密閉する。当該ブラケットは、接続口６５及び回転角センサ９を有しないこと以外は、ブラケット６１と同態様を成す。また、この直結側のブラケットの中央部からは、前記直結側の回転軸２の他端２２が突出している。尚、当該ブラケットにおいても、フレーム６０から供された冷媒を回転電機１の回転軸２よりも下方のコイルエンド４２Ｂに案内可能な冷媒案内部材５と同態様の冷媒案内部材（図示省略）が具備される。 The bracket on the direct connection side seals the opening of the frame 60 on the direct connection side shown in FIG. The bracket has the same mode as the bracket 61 except that it does not have the connection port 65 and the rotation angle sensor 9. Further, the other end 22 of the rotating shaft 2 on the directly connected side protrudes from the central portion of the bracket on the directly connected side. The bracket also includes a refrigerant guide member (not shown) having the same aspect as the refrigerant guide member 5 capable of guiding the refrigerant supplied from the frame 60 to the coil end 42B below the rotary shaft 2 of the rotary electric machine 1. Will be done.
　以下、図１～６を参照して回転電機１の冷却作用の一例について説明する。 Hereinafter, an example of the cooling action of the rotary electric machine 1 will be described with reference to FIGS. 1 to 6.
　ポンプ圧送によりフレーム６０の冷媒導入路６２ａを介してブラケット６１の冷媒導入路６２ｂに導入された前記冷媒は第一流入孔６３及び第二流入孔６４を介してブラケット６１内に流入する。第一流入孔６３から流入した前記冷媒はブラケット６１の内面部６１ａに沿って重力流下する。この内面部６１ａに沿って流下した冷媒は、案内部６８に案内されて冷媒導入溝６７に移行し、軸受７に供される。一方、第二流入孔６４から流入した前記冷媒は内面部６１ａの内周方向に沿って重力流下する。この内周方向に流下した冷媒の一部は回転軸２の上方の固定子４のコイルエンド４２Ａの冷却に供される。また、前記冷媒の他の一部は内面部６１ａに沿って冷媒案内部材５側に流下する。さらに、冷媒案内部材５の第一案内補助部５１側に流下した前記冷媒は、第一案内補助部５１の案内により案内本体部５０の長手方向に沿って第二案内補助部５２に向かって流下する。また、軸受支持部６６（回転軸２、軸受７）の近傍から第二案内補助部５２側に流下した前記冷媒は第二案内補助部５２の案内により回転軸２から最下方のコイルエンド４２Ａに向けて供される。以上のように、前記冷媒がコイルエンド４２Ａの周方向に沿って均一に供されるので、コイルエンド４２Ａが均等に冷却される。また、軸受支持部６６側から冷媒案内部材５に流下する冷媒の一部は流出口６９を介してブラケット６１の背面部６１ｂ側に移行して背面部６１ｂの冷却に供される。さらに、前記直結側のブラケット内のコイルエンド４２Ｂもブラケット６１内のコイルエンド４２Ａと同様の前記冷媒の供給を受けて均等に冷却される。そして、コイルエンド４２Ａ，４２Ｂの冷却に供された冷媒はフレーム６０の排出口６２ｃから排出される。 The refrigerant introduced into the refrigerant introduction path 62b of the bracket 61 via the refrigerant introduction path 62a of the frame 60 by pumping flows into the bracket 61 through the first inflow hole 63 and the second inflow hole 64. The refrigerant that has flowed in from the first inflow hole 63 flows down by gravity along the inner surface portion 61a of the bracket 61. The refrigerant flowing down along the inner surface portion 61a is guided by the guide portion 68, shifts to the refrigerant introduction groove 67, and is provided to the bearing 7. On the other hand, the refrigerant flowing in from the second inflow hole 64 flows down by gravity along the inner peripheral direction of the inner surface portion 61a. A part of the refrigerant flowing down in the inner peripheral direction is used for cooling the coil end 42A of the stator 4 above the rotating shaft 2. Further, the other part of the refrigerant flows down to the refrigerant guide member 5 side along the inner surface portion 61a. Further, the refrigerant that has flowed down to the first guide auxiliary portion 51 side of the refrigerant guide member 5 flows down toward the second guide auxiliary portion 52 along the longitudinal direction of the guide main body portion 50 by the guidance of the first guide auxiliary portion 51. To do. Further, the refrigerant flowing down from the vicinity of the bearing support portion 66 (rotary shaft 2, bearing 7) to the second guide auxiliary portion 52 side is guided from the rotary shaft 2 to the lowermost coil end 42A by the guidance of the second guide auxiliary portion 52. Served towards. As described above, since the refrigerant is uniformly supplied along the circumferential direction of the coil end 42A, the coil end 42A is uniformly cooled. Further, a part of the refrigerant flowing down from the bearing support portion 66 side to the refrigerant guide member 5 moves to the back surface portion 61b side of the bracket 61 via the outflow port 69 and is used for cooling the back surface portion 61b. Further, the coil end 42B in the bracket on the directly connected side is also uniformly cooled by receiving the same supply of the refrigerant as the coil end 42A in the bracket 61. Then, the refrigerant used for cooling the coil ends 42A and 42B is discharged from the discharge port 62c of the frame 60.
　以上のように、回転電機１の冷却機構によれば、フレーム６０内に導入された冷媒が、冷媒案内部材５の案内により、フレーム６０内のコイルエンド４２Ａ，４２Ｂの所定部位に供給される。特に、従来において冷却が不充分であった回転軸２よりも下方の部位、特に、コイルエンド４２Ａ，４２Ｂの最下位への冷媒の供給が可能となる。そして、この冷却効果の向上により、電流密度に余裕ができるので、回転電機１の小型化も可能となる。よって、低コストに回転電機１におけるコイルエンド４２Ａ，４２Ｂの冷却効果の向上が図られる。 As described above, according to the cooling mechanism of the rotary electric machine 1, the refrigerant introduced into the frame 60 is supplied to the predetermined portions of the coil ends 42A and 42B in the frame 60 by the guidance of the refrigerant guide member 5. In particular, it is possible to supply the refrigerant to a portion below the rotating shaft 2, which has been insufficiently cooled in the past, particularly to the lowermost portion of the coil ends 42A and 42B. Further, by improving the cooling effect, a margin can be provided in the current density, so that the rotary electric machine 1 can be miniaturized. Therefore, the cooling effect of the coil ends 42A and 42B in the rotary electric machine 1 can be improved at low cost.
　また、冷媒案内部材５が取り付けられる反直結側及び直結側のブラケットが放熱性の高い合金、例えば、アルミ合金から構成されることで、冷媒が冷媒案内部材５に供される過程で冷やされるので、冷却効果がさらに高まる。 Further, since the brackets on the anti-direct connection side and the direct connection side to which the refrigerant guide member 5 is attached are made of an alloy having high heat dissipation, for example, an aluminum alloy, the refrigerant is cooled in the process of being supplied to the refrigerant guide member 5. , The cooling effect is further enhanced.
　さらに、冷媒案内部材５においては、長板状の案内本体部５０により前記ブラケットの内面部に沿って供された前記冷媒が前記下方に案内されるので、当該冷媒を回転軸２の下方に移行できる。 Further, in the refrigerant guide member 5, since the refrigerant provided along the inner surface portion of the bracket is guided downward by the long plate-shaped guide main body portion 50, the refrigerant is transferred to the lower side of the rotation shaft 2. it can.
　そして、案内本体部５０の長手方向に沿う縁部において第一案内補助部５１がさらに立設されることで、前記冷媒が案内本体部５０の一端側から前記下方に案内されるので、当該冷媒を確実に前記下方に移行できる。 Then, the first guide auxiliary portion 51 is further erected at the edge portion along the longitudinal direction of the guide main body portion 50, so that the refrigerant is guided downward from one end side of the guide main body portion 50. Can be reliably moved downward.
　また、案内本体部５０の上面部において第二案内補助部５２がさらに立設されたことで、前記内面部に沿って回転軸２の付近に供された前記冷媒を回転軸２から最下方のコイルエンド４２Ａ，４２Ｂに向けて供給できる。 Further, since the second guide auxiliary portion 52 is further erected on the upper surface portion of the guide main body portion 50, the refrigerant provided in the vicinity of the rotation shaft 2 along the inner surface portion is placed at the lowermost position from the rotation shaft 2. It can be supplied toward the coil ends 42A and 42B.
　さらに、第二案内補助部５２が設けられる案内本体部５０の上面部は、第一案内補助部５１が設けられる案内本体部５０の上面部よりも、前記内面部からの張り出し長さを大きくすることで、前記最下方のコイルエンド４２Ａ，４２Ｂへの前記冷媒の供給効果がさらに高まる。 Further, the upper surface portion of the guide main body 50 provided with the second guide auxiliary portion 52 has a larger overhang length from the inner surface portion than the upper surface portion of the guide main body 50 provided with the first guide auxiliary portion 51. As a result, the effect of supplying the refrigerant to the lowermost coil ends 42A and 42B is further enhanced.
　そして、案内本体部５０の上面部が前記下方のコイルエンド４２Ａ，４２Ｂに向けて傾斜に配置されることで、第二案内補助部５２が前記最下方のコイルエンド４２Ａ，４２Ｂに向けて張り出される。よって、前記最下方のコイルエンド４２Ａ，４２Ｂへの前記冷媒の供給効果がさらに一層高まる。 Then, the upper surface portion of the guide main body portion 50 is arranged so as to be inclined toward the lower coil ends 42A and 42B, so that the second guide auxiliary portion 52 projects toward the lowermost coil ends 42A and 42B. Is done. Therefore, the effect of supplying the refrigerant to the lowermost coil ends 42A and 42B is further enhanced.
　また、冷媒案内部材５がブラケット６１の内面部６１ａに取り付けられることで、ブラケット６１と冷媒案内部材５との間の熱伝導により冷媒案内部材５の冷却効果が高まるので、前記下方のコイルエンド４２Ａ，４２Ｂの冷却効果がさらに高まる。 Further, since the refrigerant guide member 5 is attached to the inner surface portion 61a of the bracket 61, the cooling effect of the refrigerant guide member 5 is enhanced by heat conduction between the bracket 61 and the refrigerant guide member 5, so that the lower coil end 42A , 42B cooling effect is further enhanced.

Claims (7)

  1. 　回転電機の固定子を収容するフレームの開口部を密閉すると共に当該固定子のコイルエンドに冷媒を供給可能なブラケットと、
    　このブラケットから供された前記冷媒を前記回転電機の回転軸よりも下方の前記コイルエンドに案内可能な冷媒案内部材と
    を有する回転電機の冷却構造。     A bracket that can seal the opening of the frame that houses the stator of the rotary electric machine and supply refrigerant to the coil end of the stator.
    A cooling structure of a rotating electric machine having a refrigerant guiding member capable of guiding the refrigerant provided from the bracket to the coil end below the rotating shaft of the rotating electric machine.
  2. 　前記冷媒案内部材は、前記ブラケットの内面部に沿って供された前記冷媒を前記下方に案内する長板状の案内本体部を有する請求項１に記載の回転電機の冷却構造。 The cooling structure for a rotary electric machine according to claim 1, wherein the refrigerant guide member has a long plate-shaped guide main body portion that guides the refrigerant provided along the inner surface portion of the bracket downward.
  3. 　前記案内本体部の長手方向に沿う縁部には、前記冷媒を当該案内本体部の一端側から前記下方に案内する第一案内補助部がさらに立設された請求項２に記載の回転電機の冷却構造。 The rotary electric machine according to claim 2, wherein a first guide auxiliary portion for guiding the refrigerant from one end side of the guide main body portion to the lower portion is further installed at an edge portion along the longitudinal direction of the guide main body portion. Cooling structure.
  4. 　前記案内本体部の上面部には、前記内面部に沿って前記回転軸の付近に供された前記冷媒をさらに当該回転軸から最下方のコイルエンドに案内する第二案内補助部がさらに立設された請求項３に記載の回転電機の冷却構造。 On the upper surface portion of the guide main body portion, a second guide auxiliary portion that further guides the refrigerant provided in the vicinity of the rotation shaft along the inner surface portion from the rotation shaft to the lowermost coil end is further erected. The cooling structure for a rotary electric machine according to claim 3.
  5. 　前記第二案内補助部が設けられる前記案内本体部の上面部は、前記第一案内補助部が設けられる前記案内本体部の上面部よりも、前記内面部からの張り出し長さが大きい請求項４に記載の回転電機の冷却構造。 4. The overhang length from the inner surface portion of the upper surface portion of the guide main body portion provided with the second guide auxiliary portion is larger than that of the upper surface portion of the guide main body portion provided with the first guide auxiliary portion. The cooling structure of the rotary electric machine described in.
  6. 　前記案内本体部の上面部は、前記下方の前記コイルエンドに向けて傾斜する請求項２から５のいずれか１項に記載の回転電機の冷却構造。 The cooling structure for a rotary electric machine according to any one of claims 2 to 5, wherein the upper surface portion of the guide main body portion is inclined toward the lower coil end.
  7. 　前記冷媒案内部材は、前記ブラケットの内面部に取り付けられる請求項１から６のいずれか１項に記載の回転電機の冷却構造。 The cooling structure for a rotary electric machine according to any one of claims 1 to 6, wherein the refrigerant guide member is attached to an inner surface portion of the bracket.
PCT/JP2020/035498 2019-12-24 2020-09-18 Cooling structure of rotary electric machine WO2021131182A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2020554923A JP6881692B1 (en) 2019-12-24 2020-09-18 Cooling structure of rotary electric machine
CN202080085886.8A CN114788147B (en) 2019-12-24 2020-09-18 Cooling structure of rotating electric machine

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019232185 2019-12-24
JP2019-232185 2019-12-24

Publications (1)

Publication Number Publication Date
WO2021131182A1 true WO2021131182A1 (en) 2021-07-01

Family

ID=76575882

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2020/035498 WO2021131182A1 (en) 2019-12-24 2020-09-18 Cooling structure of rotary electric machine

Country Status (1)

Country Link
WO (1) WO2021131182A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010028958A (en) * 2008-07-17 2010-02-04 Toyota Motor Corp Rotating electrical machine and cooling system of rotating electrical machine
JP2010213495A (en) * 2009-03-11 2010-09-24 Honda Motor Co Ltd Toroidal winding motor
JP2013135577A (en) * 2011-12-27 2013-07-08 Toyota Industries Corp Cooling structure of rotary electric machine
JP2019013101A (en) * 2017-06-30 2019-01-24 Ntn株式会社 Rotating motor and in-wheel motor driving device with rotating motor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010028958A (en) * 2008-07-17 2010-02-04 Toyota Motor Corp Rotating electrical machine and cooling system of rotating electrical machine
JP2010213495A (en) * 2009-03-11 2010-09-24 Honda Motor Co Ltd Toroidal winding motor
JP2013135577A (en) * 2011-12-27 2013-07-08 Toyota Industries Corp Cooling structure of rotary electric machine
JP2019013101A (en) * 2017-06-30 2019-01-24 Ntn株式会社 Rotating motor and in-wheel motor driving device with rotating motor

Similar Documents

Publication Publication Date Title
US9071099B2 (en) Fan unit
JP5879116B2 (en) Rotating electric machine, railway vehicle including the same, and electric vehicle
EP2602917B1 (en) Dynamo-electric machine
US20080020696A1 (en) Air-cooled motor
JPS58201559A (en) Heat insulating device for spindle stock
CN103580380B (en) Electrically powered machine for motor vehicle driven by mixed power or electric vehicle
JP2010196478A (en) Cooling structure of electric-motor assisted supercharger
CN115242031A (en) Magnetic suspension high-speed motor with air cooling structure and capable of preventing sleeve from shifting
WO2021131182A1 (en) Cooling structure of rotary electric machine
JP6881692B1 (en) Cooling structure of rotary electric machine
JP2008312364A (en) Cooling system for electric vehicle
JP2000102221A (en) Control device one-piece-type dynamo-electric machine
CN114268193B (en) Vehicle, electric drive system and processing method thereof
CN215378647U (en) Cooling structure of permanent magnet synchronous motor
US11909269B2 (en) Combined fixed fan for disc-type motor
CN115088164B (en) Cooling structure of rotating electric machine
JP2005168204A (en) Rotary electric machine
JP2018182981A (en) Outward rotation type rotary electric machine and hoist for elevator using the same
CN113224887A (en) Composite material permanent magnet synchronous motor
JP5723855B2 (en) Rotating electric machine
US10348152B2 (en) Dynamo for an internal combustion engine
JP2017200354A (en) Brushless rotary electric machine
CN113711473A (en) Drive unit with cooling unit
CN216564756U (en) Direct current motor with uniform speed control mechanism
CN216981684U (en) Self-cooling magnetic suspension high-speed motor with heat dissipation impeller

Legal Events

Date Code Title Description
ENP Entry into the national phase

Ref document number: 2020554923

Country of ref document: JP

Kind code of ref document: A

121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20907963

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20907963

Country of ref document: EP

Kind code of ref document: A1