TWI782944B - Motor cooling structure, power motor and electric drive system - Google Patents

Motor cooling structure, power motor and electric drive system Download PDF

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Publication number
TWI782944B
TWI782944B TW107101656A TW107101656A TWI782944B TW I782944 B TWI782944 B TW I782944B TW 107101656 A TW107101656 A TW 107101656A TW 107101656 A TW107101656 A TW 107101656A TW I782944 B TWI782944 B TW I782944B
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Taiwan
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motor
cooling structure
liquid cooling
liquid
rotor
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TW107101656A
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Chinese (zh)
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TW201832452A (en
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張勝川
蘭紅玉
張詩香
李鵬
張敬才
朱駕先
力文 許
莊朝暉
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大陸商蔚來（安徽）控股有限公司
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
    • 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
    • H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator

Abstract

本發明涉及電機冷卻結構及包括其的動力電機和電驅動系統。所述電機冷卻結構包括轉子液冷結構，並且，所述轉子液冷結構包括位於轉子轉軸內的空心盲孔，在所述空心盲孔內設置有液冷管道，所述液冷管道的第一端開口伸出到所述空心盲孔的盲端，所述液冷管道的第二端開口伸出到所述空心盲孔的開口端，所述空心盲孔和所述液冷管道構成所述轉子液冷結構的液冷流路。The invention relates to a motor cooling structure and a power motor and an electric drive system including the same. The motor cooling structure includes a rotor liquid cooling structure, and the rotor liquid cooling structure includes a hollow blind hole located in the rotor shaft, a liquid cooling pipe is arranged in the hollow blind hole, and the first of the liquid cooling pipe The end opening protrudes to the blind end of the hollow blind hole, the second end opening of the liquid cooling pipe protrudes to the open end of the hollow blind hole, and the hollow blind hole and the liquid cooling pipe constitute the The liquid cooling flow path of the rotor liquid cooling structure.

Description

電機冷卻結構、動力電機及電驅動系統Motor cooling structure, power motor and electric drive system

[0001] 本發明涉及動力電機技術領域；具體地說，本發明涉及電機冷卻結構、動力電機及電驅動系統。The present invention relates to power motor technical field; Specifically, the present invention relates to motor cooling structure, power motor and electric drive system. Background technology

[0002] 以電動汽車為例，其動力電機極力追求高功率/轉矩密度、高效率、高可靠性。在設計時，電機電磁負荷和熱負荷的選取趨於極限，導致單位體積的損耗和發熱量明顯增大，對電機的功率和轉矩密度、效率、絕緣材料的性能以及壽命和可靠性產生顯著的影響。 　　[0003] 為此，必須改善動力電機的冷卻散熱、合理選取和佈置冷卻系統，避免局部過熱點，設法將電機內的熱量充分排出。在確保電機安全可靠運行的前提下，充分挖掘電機的潛力，使電機性能發揮到極致。 　　[0004] 對於感應電機來講，由於在轉子上感應電流，使得轉子上產生較大的熱量，而通常轉子的散熱較困難，轉子的溫升較高；同時，動力電機的轉速通常很高，高達15000rpm，高速運行條件下，軸承的自身損耗增加，考慮到轉子本身溫升的熱傳導，使得軸承的溫度過高，極易產生軸承過溫，嚴重影響軸承的壽命。 　　[0005] 當前，動力電機大多採用機殼液冷的方式進行電機的冷卻，機殼通常為外殼和內殼通過熱套安裝在一起，形成內置的螺旋型或者S型或其它形狀的冷卻回路；電機的定子繞組普遍採用真空浸漆技術。Taking electric vehicle as example, its power motor pursues high power/torque density, high efficiency, high reliability to the utmost. When designing, the selection of the electromagnetic load and thermal load of the motor tends to the limit, resulting in a significant increase in the loss and calorific value per unit volume, which has a significant impact on the power and torque density, efficiency, insulation material performance, life and reliability of the motor. Impact. [0003] For this reason, it is necessary to improve the cooling and heat dissipation of the power motor, reasonably select and arrange the cooling system, avoid local hot spots, and try to fully discharge the heat in the motor. On the premise of ensuring the safe and reliable operation of the motor, the potential of the motor is fully tapped to maximize the performance of the motor. For the induction motor, due to the induction current on the rotor, larger heat is produced on the rotor, and the heat dissipation of the rotor is usually difficult, and the temperature rise of the rotor is higher; meanwhile, the rotating speed of the power motor is usually very high, As high as 15000rpm, under high-speed operating conditions, the loss of the bearing itself increases. Considering the heat conduction of the temperature rise of the rotor itself, the temperature of the bearing is too high, which is easy to cause overheating of the bearing and seriously affects the life of the bearing. At present, power motor adopts the mode of casing liquid cooling to carry out the cooling of motor mostly, and casing is usually that casing and inner casing are installed together by shrinking sleeve, forms the cooling circuit of built-in spiral type or S type or other shapes; The stator winding of the motor generally adopts vacuum impregnation technology.

[0006] 本發明的目的是提供一種能夠克服前述現有技術缺陷的電機冷卻結構。 　　[0007] 進一步地，本發明的目的還在於提供一種包括前述電機冷卻結構的動力電機及電驅動系統。 　　[0008] 為了實現前述目的，本發明的第一方面提供了一種電機冷卻結構，其中，所述電機冷卻結構包括轉子液冷結構，並且，所述轉子液冷結構包括位於轉子轉軸內的空心盲孔，在所述空心盲孔內設置有液冷管道，所述液冷管道的第一端開口伸出到所述空心盲孔的盲端，所述液冷管道的第二端開口伸出到所述空心盲孔的開口端，所述空心盲孔和所述液冷管道構成所述轉子液冷結構的液冷流路。 　　[0009] 可選地，在如前所述的電機冷卻結構中，所述液冷管道上具有所述第二端開口的一端固定至電機機殼或電機端蓋上。 　　[0010] 可選地，在如前所述的電機冷卻結構中，所述電機冷卻結構還包括定子液冷結構，所述定子液冷結構與所述轉子液冷結構流體連通。 　　[0011] 可選地，在如前所述的電機冷卻結構中，所述定子液冷結構包括電機機殼處的雙螺旋液冷回路。 　　[0012] 可選地，在如前所述的電機冷卻結構中，所述雙螺旋液冷回路一體式壓鑄於所述電機機殼中。 　　[0013] 可選地，在如前所述的電機冷卻結構中，所述電機機殼包括嵌套的外殼和內殼，所述雙螺旋液冷回路由嵌套的所述外殼和所述內殼配合形成。 　　[0014] 可選地，在如前所述的電機冷卻結構中，所述雙螺旋液冷回路具有兩個並聯的單螺旋流路，並且所述單螺旋流路具有共用的進液口和不同的排液口。 　　[0015] 可選地，在如前所述的電機冷卻結構中，所述液冷管道的第二端開口經由所述轉子液冷結構的入液口連接至兩個所述單螺旋流路之一的排液口。 　　[0016] 可選地，在如前所述的電機冷卻結構中，所述空心盲孔的開口端經由所述轉子液冷結構的入液口連接至兩個所述單螺旋流路之一的排液口。 　　[0017] 可選地，在如前所述的電機冷卻結構中，所述電機冷卻結構還包括塑封於電機的定子端部繞組處的環氧樹脂，所述環氧樹脂位於所述定子端部繞組和電機機殼之間。 　　[0018] 為了實現前述目的，本發明的第二方面提供了一種動力電機，其中，所述動力電機包括如前述第一方面中任一項所述的電機冷卻結構。 　　[0019] 為了實現前述目的，本發明的協力廠商面提供了一種電驅動系統，其中，所述電驅動系統包括如前述第二方面中所述的電機。Summary of the invention The object of the present invention is to provide a kind of motor cooling structure that can overcome aforementioned prior art defect. [0007] Further, the object of the present invention is also to provide a power motor and an electric drive system comprising the aforementioned motor cooling structure. [0008] In order to achieve the aforementioned object, the first aspect of the present invention provides a motor cooling structure, wherein the motor cooling structure includes a rotor liquid cooling structure, and the rotor liquid cooling structure includes a hollow blind located in the rotor shaft Hole, a liquid cooling pipe is arranged in the hollow blind hole, the first end opening of the liquid cooling pipe protrudes to the blind end of the hollow blind hole, and the second end opening of the liquid cooling pipe protrudes to The open end of the hollow blind hole, the hollow blind hole and the liquid cooling pipe form a liquid cooling flow path of the liquid cooling structure of the rotor. [0009] Optionally, in the aforementioned motor cooling structure, one end of the liquid cooling pipeline having the second end opening is fixed to the motor casing or the motor end cover. [0010] Optionally, in the aforementioned motor cooling structure, the motor cooling structure further includes a stator liquid cooling structure, and the stator liquid cooling structure is in fluid communication with the rotor liquid cooling structure. [0011] Optionally, in the aforementioned motor cooling structure, the stator liquid cooling structure includes a double-helix liquid cooling circuit at the motor casing. [0012] Optionally, in the aforementioned motor cooling structure, the double-helix liquid cooling circuit is integrally die-cast in the motor casing. Optionally, in the motor cooling structure as described above, the motor casing includes a nested outer shell and an inner shell, and the double-helix liquid cooling circuit is composed of the nested outer shell and the inner shell. The shell is formed together. Optionally, in the aforementioned motor cooling structure, the double helix liquid cooling circuit has two parallel single helix flow paths, and the single helix flow path has a shared liquid inlet and different drain port. Optionally, in the motor cooling structure as described above, the second end opening of the liquid cooling pipeline is connected to one of the two single helical flow paths via the liquid inlet of the rotor liquid cooling structure. One drain port. Optionally, in the aforementioned motor cooling structure, the open end of the hollow blind hole is connected to one of the two single helical flow paths via the liquid inlet of the rotor liquid cooling structure. Drain. Optionally, in the motor cooling structure as described above, the motor cooling structure also includes epoxy resin plastic-encapsulated at the stator end winding of the motor, and the epoxy resin is located at the stator end between the windings and the motor housing. [0018] In order to achieve the aforementioned object, a second aspect of the present invention provides a power motor, wherein the power motor includes a motor cooling structure as described in any one of the aforementioned first aspects. [0019] In order to achieve the aforementioned object, the third party of the present invention provides an electric drive system, wherein the electric drive system includes a motor as described in the aforementioned second aspect.

[0021] 下面參照附圖詳細地說明本發明的具體實施方式。在各附圖中，相同的附圖標記表示相同或相應的技術特徵。 　　[0022] 圖1為根據本發明的動力電機的一種實施方式的截面示意圖。從圖中可以看出，該動力電機包括電機機殼1、定子繞組2、定子鐵芯3、電機端蓋5、轉子鐵芯6等。 　　[0023] 圖中，定子繞組2嵌繞在定子鐵芯3內，定子鐵芯3通過熱套裝配於電機機殼1上，電機端蓋5與電機機殼1通過螺栓連接在一起。電機機殼1可內置定子液冷結構。在電機運行時，冷卻液在定子液冷結構內迴圈流動，將電機定子處的熱量帶走。此處的冷卻液可以是冷卻水或其它常用的液體冷卻介質。 　　[0024] 另外，定子鐵芯3的端部繞組可以採用真空澆注環氧樹脂4進行塑封。如圖所示，環氧樹脂4可以處於定子端部繞組和電機機殼之間，在保證定子繞組的絕緣性能的同時，顯著改善了電機定子端部繞組的散熱性能。 　　[0025] 圖中轉子鐵芯6可以通過過盈配合安裝於轉子轉軸8上，轉子端環7a、7b位於轉子鐵芯6的兩側。轉子轉軸8通過兩端的第一軸承9a和第二軸承9b支撐在電機機殼1和端蓋5上。第一軸承9a、第二軸承9b外側分別設置有O型圈10a和10b。轉子轉軸8內設置有空心盲孔18，在空心盲孔18內設置有液冷管道11，可以瞭解，冷卻液可以從液冷管道11流入、從空心盲孔18流出，也可以從空心盲孔18流入、從液冷管道11流出，實現電機轉子的冷卻。 　　[0026] 依據圖1中，液冷管道11上具有第一端開口11a的一端懸置於空心盲孔18內；而具有第二端開口11b的一端則固定於電機機殼1或電機端蓋。為了保證轉子液冷結構的冷卻液不進入電機內部，在轉子轉軸8的端部可以設有動態密封件12。 　　[0027] 圖2為圖1中動力電機的帶一體式定子液冷結構的電機機殼1。該電機機殼1可以具有通過一體壓鑄成型的U型結構。可以瞭解，一體成型式液冷機殼結構更簡單、可靠。 　　[0028] 動力電機的定子液冷結構可以位於該電機機殼處。在圖示實施方式中的定子液冷結構具有雙螺旋液冷回路。可以瞭解，該雙螺旋液冷回路可以形成在電機機殼內側、外側或內置於所述電機一體式機殼中。例如，在可選的實施方式中，雙螺旋液冷結構可以直接鑄造在電機機殼內；或者電機機殼可以包括嵌套的外殼和內殼，雙螺旋液冷回路則可以由該嵌套的外殼和內殼配合形成。具體地，外殼和內殼可以採用熱套安裝並在兩端進行焊接固定。優選地，定子液冷結構可以與轉子液冷結構流體連通；下文中會結合定子液冷結構和轉子液冷結構進行具體描述。 　　[0029] 圖3為圖2中電機機殼處的雙螺旋液冷回路。 　　[0030] 從圖中可以看出，該雙螺旋液冷回路可以具有兩個並聯的單螺旋流路，並且單螺旋流路具有共用的進液口13和不同的排液口14、15。可見，雙螺旋液冷回路中的冷卻液將由進液口13流入，而後分兩路分別沿著兩個單螺旋流路流動，進行電機定子的冷卻，然後從第一單螺旋流路的排液口15和第二單螺旋流路的排液口14流出。 　　[0031] 如前文中所述，定子液冷結構可以與轉子液冷結構流體連通。在可選的實施方式中，定子液冷結構的雙螺旋液冷回路的排液口15可以與轉子液冷結構的入液口直接相連，進行轉子的冷卻；而排液口14則可以直接經電機機殼1向外流出。相應地，也可以使排液口14與轉子液冷結構的入液口直接相連，進行轉子的冷卻、排液口15則直接經電機機殼1向外流出。 　　[0032] 圖4為圖1中動力電機的轉子液冷結構的示意圖。 　　[0033] 從圖中可以看出，該轉子液冷結構包括位於轉子轉軸8內的空心盲孔18，在空心盲孔18內設置有液冷管道11，二者之間形成了環形腔室適於冷卻液流過。液冷管道11的第一端開口11a伸出到空心盲孔18的盲端，而液冷管道11的第二端開口11b伸出到空心盲孔18的開口端。空心盲孔18和液冷管道11構成轉子液冷結構的液冷流路。另外，轉子液冷結構還包括分別連接到液冷管道的第一端開口11a和空心盲孔18的開口端的入液口16和出液口17。 　　[0034] 如前文中所述，轉子液冷結構可以與定子液冷結構流體連通。例如，液冷管道11的第二端開口11b可以經由轉子液冷結構的入液口16連接至兩個單螺旋流路之一的排液口14或15。在這種情況下，冷卻液可以經由電機機殼1上的第一單螺旋流路的排液口14或15經轉子轉軸8中的液冷管道11的入液口16進入轉子轉軸8中的液冷管道11內，而後經液冷管道11與轉子轉軸8內的環形腔室流出，最後經轉子液冷結構11的出液口17流出。再例如，空心盲孔18的開口端可以經由轉子液冷結構的入液口16連接至兩個單螺旋流路之一的排液口14或15。在這種情況下，冷卻液也可以經由電機機殼1上的第一單螺旋流路的排液口14或15經轉子轉軸8中的液冷管道11的入液口16進入轉子轉軸8中的環形腔室內，而後經環形腔室與液冷管道11流出，最後經轉子液冷結構的出液口17流出。可以瞭解，上述兩種不同的連接方式可以實現轉子液冷結構中不同的冷卻液流向。 　　[0035] 通過以上描述，所屬領域的技術人員可以獲得包括如前所述的電機冷卻結構的動力電機和電驅動系統。可以想到，這種電機和電驅動系統可以用於驅動例如新能源汽車等新能源車輛。 　　[0036] 所屬領域的技術人員可以瞭解，本發明採用雙螺旋結構的電機機殼液冷的方式對電機的定子進行冷卻散熱，並在定子端部繞組處澆注環氧樹脂進行塑封，進一步改善定子端部繞組的散熱，使得電機定子上的熱量得到很好的擴散，對於改善電機的絕緣材料的壽命具有重要的意義；同時，為了統籌設計分析，避免電機轉子過溫或軸承過溫，本發明採用了轉子液冷結構，協同電機的電磁和熱設計，避免局部薄弱環節，有助於提高電機的功率和轉矩密度、壽命和可靠性，具有非常重要的意義。 　　[0037] 本發明的技術範圍不僅僅局限於上述說明中的內容，本領域技術人員可以在不脫離本發明技術思想的前提下，對上述實施方式進行多種變形和修改，而這些變形和修改均應當屬於本發明的範圍內。Embodiment The specific embodiment of the present invention is described in detail below with reference to accompanying drawing. In the drawings, the same reference numerals represent the same or corresponding technical features. Fig. 1 is a schematic cross-sectional view of an embodiment of a power motor according to the present invention. It can be seen from the figure that the power motor includes a motor casing 1, a stator winding 2, a stator core 3, a motor end cover 5, a rotor core 6, and the like. [0023] In the figure, the stator winding 2 is embedded in the stator core 3, the stator core 3 is fitted on the motor casing 1 by shrink fitting, and the motor end cover 5 and the motor casing 1 are connected together by bolts. The motor casing 1 may have a built-in stator liquid cooling structure. When the motor is running, the coolant circulates in the stator liquid cooling structure to take away the heat from the motor stator. The cooling liquid here can be cooling water or other commonly used liquid cooling media. [0024] In addition, the end winding of the stator core 3 can be plastic-encapsulated by vacuum casting epoxy resin 4. As shown in the figure, the epoxy resin 4 can be placed between the stator end winding and the motor casing, which can significantly improve the heat dissipation performance of the motor stator end winding while ensuring the insulation performance of the stator winding. [0025] In the figure, the rotor core 6 can be installed on the rotor shaft 8 through interference fit, and the rotor end rings 7a, 7b are located on both sides of the rotor core 6. The rotor shaft 8 is supported on the motor casing 1 and the end cover 5 through the first bearing 9a and the second bearing 9b at both ends. O-rings 10a and 10b are arranged on the outer sides of the first bearing 9a and the second bearing 9b respectively. A hollow blind hole 18 is arranged in the rotor rotating shaft 8, and a liquid cooling pipe 11 is arranged in the hollow blind hole 18. It can be understood that the cooling liquid can flow in from the liquid cooling pipe 11, flow out from the hollow blind hole 18, or flow from the hollow blind hole. 18 flows into and flows out from the liquid cooling pipe 11 to realize the cooling of the motor rotor. According to Fig. 1, one end with the first end opening 11a on the liquid cooling pipeline 11 is suspended in the hollow blind hole 18; and the end with the second end opening 11b is then fixed to the motor casing 1 or the motor end cover . In order to ensure that the coolant in the liquid cooling structure of the rotor does not enter the interior of the motor, a dynamic seal 12 may be provided at the end of the rotor shaft 8 . [0027] Fig. 2 is a motor housing 1 with an integrated stator liquid cooling structure of the power motor in Fig. 1. The motor casing 1 may have a U-shaped structure formed by integral die-casting. It can be understood that the one-piece liquid-cooled casing has a simpler and more reliable structure. [0028] The stator liquid cooling structure of the power motor can be located at the motor casing. The stator liquid cooling structure in the illustrated embodiment has a double-helix liquid cooling circuit. It can be understood that the double-helix liquid cooling circuit can be formed inside or outside the motor casing or built in the integrated motor casing. For example, in an alternative embodiment, the double-helix liquid cooling structure can be directly cast in the motor casing; or the motor casing can include nested outer and inner casings, and the double-helix liquid cooling circuit can be formed by The outer shell and the inner shell are cooperatively formed. Specifically, the outer shell and the inner shell can be mounted by shrink fitting and fixed by welding at both ends. Preferably, the liquid cooling structure of the stator can be in fluid communication with the liquid cooling structure of the rotor; the following will describe in detail in conjunction with the liquid cooling structure of the stator and the liquid cooling structure of the rotor. [0029] Fig. 3 is a double-helix liquid cooling circuit at the motor casing in Fig. 2. [0030] As can be seen from the figure, the double helix liquid cooling circuit can have two parallel single helix flow paths, and the single helix flow path has a common liquid inlet 13 and different liquid outlets 14,15. It can be seen that the coolant in the double-helix liquid cooling circuit will flow in from the liquid inlet 13, and then flow along the two single-helix flow paths in two paths to cool the motor stator, and then drain liquid from the first single-helix flow path Port 15 and the drain port 14 of the second single spiral flow path flow out. [0031] As mentioned above, the stator liquid cooling structure may be in fluid communication with the rotor liquid cooling structure. In an optional embodiment, the liquid outlet 15 of the double-helix liquid cooling circuit of the stator liquid cooling structure can be directly connected with the liquid inlet of the rotor liquid cooling structure to cool the rotor; while the liquid outlet 14 can be directly passed through The motor casing 1 flows out. Correspondingly, the liquid discharge port 14 can also be directly connected with the liquid inlet port of the rotor liquid cooling structure to cool the rotor, and the liquid discharge port 15 flows out directly through the motor casing 1 . [0032] Fig. 4 is a schematic diagram of the rotor liquid cooling structure of the power motor in Fig. 1. As can be seen from the figure, the rotor liquid cooling structure includes a hollow blind hole 18 located in the rotor shaft 8, a liquid cooling pipeline 11 is arranged in the hollow blind hole 18, and an annular chamber is formed between the two. through the coolant. The first end opening 11 a of the liquid cooling pipe 11 protrudes to the blind end of the hollow blind hole 18 , and the second end opening 11 b of the liquid cooling pipe 11 protrudes to the open end of the hollow blind hole 18 . The hollow blind hole 18 and the liquid cooling pipe 11 constitute the liquid cooling flow path of the rotor liquid cooling structure. In addition, the rotor liquid cooling structure further includes a liquid inlet 16 and a liquid outlet 17 respectively connected to the first end opening 11 a of the liquid cooling pipe and the open end of the hollow blind hole 18 . [0034] As mentioned above, the rotor liquid cooling structure may be in fluid communication with the stator liquid cooling structure. For example, the second end opening 11b of the liquid cooling pipe 11 may be connected to the liquid outlet 14 or 15 of one of the two single spiral flow paths via the liquid inlet 16 of the rotor liquid cooling structure. In this case, the coolant can enter the rotor shaft 8 through the liquid outlet 14 or 15 of the first single spiral flow path on the motor casing 1 through the liquid inlet 16 of the liquid cooling pipe 11 in the rotor shaft 8 inside the liquid cooling pipe 11 , then flow out through the liquid cooling pipe 11 and the annular chamber inside the rotor shaft 8 , and finally flow out through the liquid outlet 17 of the rotor liquid cooling structure 11 . For another example, the open end of the hollow blind hole 18 may be connected to the liquid outlet 14 or 15 of one of the two single spiral flow paths via the liquid inlet 16 of the rotor liquid cooling structure. In this case, the coolant can also enter the rotor shaft 8 through the liquid outlet 14 or 15 of the first single spiral flow path on the motor casing 1 and through the liquid inlet 16 of the liquid cooling pipe 11 in the rotor shaft 8 In the annular chamber, then flow out through the annular chamber and the liquid cooling pipe 11, and finally flow out through the liquid outlet 17 of the rotor liquid cooling structure. It can be understood that the above two different connection modes can realize different flow directions of cooling liquid in the liquid cooling structure of the rotor. [0035] Through the above description, those skilled in the art can obtain a power motor and an electric drive system including the aforementioned motor cooling structure. It is conceivable that this motor and electric drive system can be used to drive new energy vehicles such as new energy vehicles. Those skilled in the art can understand that the present invention adopts the motor casing liquid cooling mode of double helix structure to carry out cooling and heat dissipation to the stator of the motor, and cast epoxy resin at the stator end winding place to carry out plastic sealing, further improve the stator The heat dissipation of the end windings makes the heat on the motor stator well diffused, which is of great significance for improving the life of the insulation material of the motor; at the same time, in order to coordinate design analysis and avoid overheating of the motor rotor or bearing, the present invention The liquid-cooled structure of the rotor is adopted, which cooperates with the electromagnetic and thermal design of the motor to avoid local weak links, which helps to improve the power and torque density, life and reliability of the motor, which is of great significance. The technical scope of the present invention is not only limited to the content in the above description, those skilled in the art can carry out multiple deformations and modifications to the above-mentioned embodiment without departing from the technical thought of the present invention, and these deformations and modifications all should belong to the scope of the present invention.

[0038]1‧‧‧電機機殼2‧‧‧定子繞組3‧‧‧定子鐵芯4‧‧‧環氧樹脂5‧‧‧電機端蓋6‧‧‧轉子鐵芯7a‧‧‧轉子端環7b‧‧‧轉子端環8‧‧‧轉子轉軸9a‧‧‧第一軸承9b‧‧‧第二軸承10a‧‧‧O型圈10b‧‧‧O型圈11‧‧‧液冷管道11a‧‧‧第一端開口11b‧‧‧第二端開口12‧‧‧動態密封件13‧‧‧進液口14‧‧‧排液口15‧‧‧排液口16‧‧‧入液口17‧‧‧出液口18‧‧‧空心盲孔1‧‧‧motor casing 2‧‧‧stator winding 3‧‧‧stator iron core 4‧‧‧epoxy resin 5‧‧‧motor end cover 6‧‧‧rotor iron core 7a‧‧‧rotor end Ring 7b‧‧‧rotor end ring 8‧‧‧rotor shaft 9a‧‧‧first bearing 9b‧‧‧second bearing 10a‧‧‧O-ring 10b‧‧‧O-ring 11‧‧‧liquid cooling pipe 11a ‧‧‧First end opening 11b‧‧‧Second end opening 12‧‧‧Dynamic seal 13‧‧‧Inlet port 14‧‧‧Drain port 15‧‧‧Drain port 16‧‧‧Inlet port 17‧‧‧liquid outlet 18‧‧‧hollow blind hole

[0020] 參照附圖，本發明的公開內容將更加顯然。應當瞭解，這些附圖僅僅用於說明的目的，而並非意在對本發明的保護範圍構成限制。圖中： 　　圖1為根據本發明的動力電機的一種實施方式的截面示意圖； 　　圖2為圖1中動力電機的帶一體式雙螺旋液冷回路的U型電機機殼； 　　圖3為圖2中電機機殼處的雙螺旋液冷回路；以及 　　圖4為圖1中動力電機的轉子液冷結構的示意圖。[0020] The disclosure of the present invention will be more apparent with reference to the accompanying drawings. It should be understood that these drawings are only for the purpose of illustration, and are not intended to limit the protection scope of the present invention. In the drawings: FIG. 1 is a schematic cross-sectional view of an embodiment of a power motor according to the present invention; FIG. 2 is a U-shaped motor casing with an integrated double-helix liquid cooling circuit of the power motor in FIG. 1; A double-helix liquid cooling circuit at the motor casing; and FIG. 4 is a schematic diagram of the rotor liquid cooling structure of the power motor in FIG. 1 .

1‧‧‧電機機殼 1‧‧‧Motor casing

2‧‧‧定子繞組 2‧‧‧Stator winding

3‧‧‧定子鐵芯 3‧‧‧Stator core

4‧‧‧環氧樹脂 4‧‧‧Epoxy resin

5‧‧‧電機端蓋 5‧‧‧Motor cover

6‧‧‧轉子鐵芯 6‧‧‧rotor core

7a‧‧‧轉子端環 7a‧‧‧rotor end ring

7b‧‧‧轉子端環 7b‧‧‧rotor end ring

8‧‧‧轉子轉軸 8‧‧‧rotor shaft

9a‧‧‧第一軸承 9a‧‧‧The first bearing

9b‧‧‧第二軸承 9b‧‧‧Second bearing

10a‧‧‧O型圈 10a‧‧‧O-ring

10b‧‧‧O型圈 10b‧‧‧O-ring

11‧‧‧液冷管道 11‧‧‧Liquid cooling pipeline

11a‧‧‧第一端開口 11a‧‧‧opening at the first end

11b‧‧‧第二端開口 11b‧‧‧Second end opening

12‧‧‧動態密封件 12‧‧‧Dynamic seal

18‧‧‧空心盲孔 18‧‧‧Hollow blind hole

Claims (13)

一種電機冷卻結構，其特徵在於，所述電機冷卻結構包括轉子液冷結構，並且，所述轉子液冷結構包括位於轉子轉軸內的空心盲孔，在所述空心盲孔內設置有液冷管道，所述液冷管道的第一端開口伸出到所述空心盲孔的盲端，所述液冷管道的第二端開口伸出到所述空心盲孔的開口端，所述空心盲孔和所述液冷管道構成所述轉子液冷結構的液冷流路。 A motor cooling structure, characterized in that the motor cooling structure includes a rotor liquid cooling structure, and the rotor liquid cooling structure includes a hollow blind hole located in the rotor shaft, and a liquid cooling pipeline is arranged in the hollow blind hole , the opening of the first end of the liquid cooling pipe protrudes to the blind end of the hollow blind hole, the opening of the second end of the liquid cooling pipe protrudes to the open end of the hollow blind hole, and the hollow blind hole and the liquid cooling pipeline form a liquid cooling flow path of the rotor liquid cooling structure. 如申請專利範圍第1項所述的電機冷卻結構，其中，所述液冷管道上具有所述第二端開口的一端固定至電機機殼或電機端蓋上。 The motor cooling structure described in item 1 of the patent scope of the application, wherein, the end of the liquid cooling pipe having the second end opening is fixed to the motor casing or the motor end cover. 如申請專利範圍第1項所述的電機冷卻結構，其中，所述電機冷卻結構還包括定子液冷結構，所述定子液冷結構與所述轉子液冷結構流體連通。 The motor cooling structure described in item 1 of the patent scope of the application, wherein the motor cooling structure further includes a stator liquid cooling structure, and the stator liquid cooling structure is in fluid communication with the rotor liquid cooling structure. 如申請專利範圍第2項所述的電機冷卻結構，其中，所述電機冷卻結構還包括定子液冷結構，所述定子液冷結構與所述轉子液冷結構流體連通。 The motor cooling structure described in item 2 of the scope of the patent application, wherein the motor cooling structure further includes a stator liquid cooling structure, and the stator liquid cooling structure is in fluid communication with the rotor liquid cooling structure. 如申請專利範圍第3項所述的電機冷卻結構，其中，所述定子液冷結構包括電機機殼處的雙螺旋液冷回路。 The motor cooling structure described in item 3 of the scope of the patent application, wherein the stator liquid cooling structure includes a double-helix liquid cooling circuit at the motor casing. 如申請專利範圍第5項所述的電機冷卻結構，其中，所述雙螺旋液冷回路一體式壓鑄於所述電機機殼中。 The motor cooling structure described in item 5 of the scope of the patent application, wherein the double-screw liquid cooling circuit is integrally die-cast in the motor casing. 如申請專利範圍第6項所述的電機冷卻結構，其中，所述電機機殼包括嵌套的外殼和內殼，所述雙螺旋液冷回路由嵌套的所述外殼和所述內殼配合形成。 The motor cooling structure described in item 6 of the patent scope of the application, wherein the motor housing includes a nested outer shell and an inner shell, and the double-helix liquid cooling circuit is matched by the nested outer shell and the inner shell form. 如申請專利範圍第5項所述的電機冷卻結構，其中，所述雙螺旋液冷回路具有兩個並聯的單螺旋流路，並且所述單螺旋流路具有共用的進液口和不同的排液口。 The motor cooling structure described in item 5 of the scope of the patent application, wherein the double-screw liquid cooling circuit has two parallel single-screw flow paths, and the single-screw flow paths have a common liquid inlet and different drains. liquid mouth. 如申請專利範圍第8項所述的電機冷卻結構，其中，所述液冷管道的第二端開口經由所述轉子液冷結構的入液口連接至兩個所述單螺旋流路之一的排液口。 The motor cooling structure described in item 8 of the patent scope of the application, wherein the second end opening of the liquid cooling pipe is connected to one of the two single spiral flow paths through the liquid inlet of the rotor liquid cooling structure Drain. 如申請專利範圍第8項所述的電機冷卻結構，其中，所述空心盲孔的開口端經由所述轉子液冷結構的入液口連接至兩個所述單螺旋流路之一的排液口。 The motor cooling structure described in item 8 of the scope of the patent application, wherein the open end of the hollow blind hole is connected to the liquid discharge of one of the two single spiral flow paths through the liquid inlet of the rotor liquid cooling structure mouth. 如申請專利範圍第1至10項中任一項所述的電機冷卻結構，其中，所述電機冷卻結構還包括塑封於電機的定子端部繞組處的環氧樹脂，所述環氧樹脂位於所述定子端部繞組和電機機殼之間。 The motor cooling structure as described in any one of items 1 to 10 in the scope of the patent application, wherein the motor cooling structure further includes epoxy resin plastic-sealed at the stator end winding of the motor, and the epoxy resin is located at the between the stator end windings and the motor casing. 一種動力電機，其特徵在於，所述動力電機包括如申請專利範圍第1至11項中任一項所述的電機冷卻結構。 A power motor, characterized in that the power motor includes the motor cooling structure described in any one of items 1 to 11 of the scope of patent application. 一種電驅動系統，其特徵在於，所述電驅動系統包括如申請專利範圍第12項所述的電機。An electric drive system, characterized in that the electric drive system includes the motor described in item 12 of the patent application.
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