Electric engine, electric propulsion device and aircraft

Abstract

The utility model provides an electric engine, an electric propulsion device and an aircraft, and relates to the technical field of aircrafts. The electric engine includes: a power motor; a liquid outlet pipeline; a liquid inlet pipeline; the radiator is used for conducting heat dissipation on the power motor, the outlet end of the radiator communicates with the inlet end of the liquid outlet pipeline, and the inlet end of the radiator communicates with the outlet end of the liquid inlet pipeline; and the radiator is rigidly connected with the power motor through at least one of the liquid outlet pipeline and the liquid inlet pipeline, so that the radiator is fixedly supported on the power motor through the liquid outlet pipeline and / or the liquid inlet pipeline. In this way, the weight of the electric engine can be reduced, and light weight of the electric engine can be achieved.

Description

Technical Field

[0001] The present application relates to the field of aircraft technology, and in particular to an electric engine, an electric propulsion device, and an aircraft. Background Art

[0002] The electric propulsion system is the direct power source for electric vertical take-off and landing (eVTOL) vehicles. It consists of propellers and an electric engine. The electric engine includes a power motor, a motor controller, and a cooling system. The power motor is connected to the propeller and drives it. The cooling system dissipates heat from the power motor and motor controller to ensure the reliability of the electric engine. However, existing electric engines are complex in design and have a large number of components, which increases their weight and limits their lightweighting. Utility Model Content

[0003] The present application aims to provide an electric engine, an electric propulsion device and an aircraft, which can simplify the weight of the electric engine and help the electric engine achieve lightweight.

[0004] According to a first aspect of an embodiment of the present application, an electric engine is provided, comprising:

[0005] Power motor;

[0006] Liquid outlet pipeline;

[0007] Liquid inlet pipeline;

[0008] The radiator is used to dissipate heat from the power motor. The outlet end of the radiator is connected to the inlet end of the liquid outlet pipeline, and the inlet end of the radiator is connected to the outlet end of the liquid inlet pipeline. The radiator is rigidly connected to the power motor through at least one of the liquid outlet pipeline and the liquid inlet pipeline, so that the radiator is fixedly supported on the power motor through the liquid outlet pipeline and / or the liquid inlet pipeline.

[0009] In this embodiment, at least one of the liquid outlet and liquid inlet lines can serve as a support structure. While connecting the radiator to the liquid flow path within the power motor, at least one of the liquid outlet and liquid inlet lines can also be used to securely connect the radiator to the power motor housing. That is, the radiator is rigidly connected to the power motor housing via the liquid outlet and / or liquid inlet lines. For example, the radiator is securely connected to the motor rear cover via the liquid outlet and liquid inlet lines. This eliminates the need for additional support structures or connecting structures to connect the radiator to the power motor, simplifying the structure of the electric motor and reducing its manufacturing cost. Furthermore, this can reduce the weight of the electric motor, contributing to its lightweight design.

[0010] In a possible implementation, there are multiple liquid inlet pipelines and multiple liquid outlet pipelines, and the liquid inlet pipelines and the liquid outlet pipelines are spaced apart in the circumferential direction of the power motor.

[0011] In a possible implementation, the number of the liquid inlet pipelines and the liquid outlet pipelines is the same, and the liquid inlet pipelines and the liquid outlet pipelines are alternately and spaced apart along the circumference of the power motor.

[0012] In one possible implementation, the power motor includes a stator and a motor rear cover, wherein the motor rear cover is connected to the stator and forms a receiving cavity with the stator; wherein:

[0013] One end of the liquid inlet pipe is fixedly connected to the radiator, and the other end of the liquid inlet pipe is fixedly connected to the stator or the rear cover of the motor;

[0014] One end of the liquid outlet pipeline is fixedly connected to the radiator, and the other end of the liquid outlet pipeline is fixedly connected to the stator or the rear cover of the motor.

[0015] In one possible implementation, a liquid inlet channel and a liquid outlet channel are provided on the rear cover of the motor. The inlet end of the liquid inlet channel is connected to the outlet end of the liquid outlet pipeline, and the outlet end of the liquid outlet channel is connected to the inlet end of the liquid inlet pipeline.

[0016] In one possible implementation, a liquid cooling channel is provided on the stator, and the electric engine further includes a motor controller and a cooling plate, the cooling plate being used to dissipate heat from the motor controller, wherein:

[0017] The outlet of the liquid inlet channel is connected to the inlet of the cooling plate, the outlet of the cooling plate is connected to the inlet of the liquid cooling channel, and the outlet of the liquid cooling channel is connected to the inlet of the liquid outlet channel; or,

[0018] The inlet end of the liquid cooling channel and the inlet end of the cooling plate are both connected to the outlet end of the liquid inlet channel, and the outlet end of the liquid cooling channel and the outlet end of the cooling plate are both connected to the inlet end of the liquid outlet channel.

[0019] In one possible implementation, the stator includes:

[0020] The stator frame is provided with a liquid cooling cavity and a flow balancing channel, the flow balancing channel is connected to the liquid inlet channel, the liquid cooling cavity is connected to the flow balancing channel and the liquid outlet channel, and the liquid cooling cavity and the flow balancing channel form a liquid cooling channel;

[0021] The stator winding is located inside the liquid cooling chamber.

[0022] In one possible implementation, the flow equalization channel includes:

[0023] an annular flow channel, the annular flow channel being connected to the liquid inlet flow channel;

[0024] A plurality of branch flow channels are arranged at intervals along the circumference of the annular flow channel, and the branch flow channels connect the annular flow channel and the liquid cooling cavity.

[0025] In one possible implementation, a liquid supply channel is further provided on the rear cover of the motor, and the electric motor further comprises a liquid pump, which is connected to the liquid inlet channel and the liquid supply channel;

[0026] The cooling plate is connected to the liquid supply channel and the liquid cooling channel, or the cooling plate and the liquid cooling channel are both connected to the outlet end of the liquid supply channel.

[0027] In a possible implementation, the rear cover of the motor has a rear cover groove, and a portion of the liquid pump is located inside the rear cover groove.

[0028] In a possible implementation, the bottom of the groove of the rear cover has a first opening and a second opening, the first opening connects the liquid inlet channel and the inlet end of the liquid pump, and the second opening connects the liquid supply channel and the outlet end of the liquid pump.

[0029] In one possible implementation, the liquid pump includes a pump housing and a pump rotor, the pump housing having a pump cavity, and the pump rotor is disposed in the pump cavity;

[0030] The pump casing includes a pump cover and a pump body. The pump cover and the pump body form a pump chamber. At least part of the pump body is located outside the groove of the rear cover and is fixedly connected to the rear cover of the motor. The pump cover is provided with an inlet joint and an outlet joint. The inlet joint is inserted into the first opening to connect the pump chamber with the liquid inlet channel. The outlet joint is inserted into the second opening to connect the pump chamber with the liquid supply channel.

[0031] In one possible implementation, the electric engine further includes:

[0032] a first sealing ring, which is sleeved on the outer wall of the inlet joint and abuts against the bottoms of the grooves of the pump cover and the rear cover respectively along the axial direction of the power motor; and / or,

[0033] The second sealing ring is sleeved on the outer wall of the outlet joint portion and abuts against the bottoms of the grooves of the pump cover and the rear cover respectively along the axial direction of the power motor.

[0034] In a possible implementation, the liquid pump includes a pump body and a pump rotor. The pump body and the motor rear cover form a pump cavity, and the pump rotor is disposed in the pump cavity.

[0035] In a possible implementation, the motor rear cover has a rear cover groove, and the pump body and the rear cover groove form a pump cavity.

[0036] In a possible implementation, the method includes: a fan, which is located between the radiator and the power motor along the axial direction of the power motor, and is used to dissipate heat from the radiator.

[0037] In one possible implementation, the liquid pump includes:

[0038] A drive motor, wherein a first output end of the drive motor is transmission-connected to the fan, and a second output end of the drive motor is transmission-connected to a pump rotor inside the liquid pump. The drive motor serves as a pump motor of the liquid pump and is used to drive the fan to rotate.

[0039] In a possible implementation, the electric engine further includes a fan motor, which is fixedly connected to the motor rear cover and is transmission-connected to the fan, and is used to drive the fan to rotate.

[0040] A second aspect of an embodiment of the present application provides an electric propulsion device, which includes a propeller and an electric engine as described in any one of the first aspects. The propeller is transmission-connected to a power motor of the electric engine, and the power motor is used to drive the propeller to rotate.

[0041] A third aspect of an embodiment of the present application provides an aircraft, which includes a fuselage, wings, a tail and an electric propulsion device as in the second aspect, wherein the electric propulsion device is arranged on the wings and / or the fuselage and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0043] Figure 1 A schematic diagram of the three-dimensional structure of an aircraft provided in an embodiment of the present application;

[0044] Figure 2 A schematic diagram of the architecture of an electric propulsion device provided in an embodiment of the present application;

[0045] Figure 3 A schematic diagram of the operation of the heat dissipation system of the electric engine provided in an embodiment of the present application;

[0046] Figure 4 A schematic diagram of the structure of an electric engine provided in an embodiment of the present application;

[0047] Figure 5 A schematic diagram of the structure of the motor rear cover provided in an embodiment of the present application;

[0048] Figure 6a for Figure 4 a schematic cross-sectional view of the electric engine shown;

[0049] Figure 6bA schematic diagram of a partial structure in which a liquid pump provided in an embodiment of the present application is integrated into a rear cover of a motor;

[0050] Figure 7a A schematic diagram of the structure of the cooling plate provided in an embodiment of the present application;

[0051] Figure 7b for Figure 7a A schematic diagram of the three-dimensional structure of the cooling plate and the motor controller shown;

[0052] Figure 8 A schematic diagram of the planar structure of the stator provided in an embodiment of the present application;

[0053] Figure 9 A schematic diagram of the partial structure of the power motor provided in an embodiment of the present application.

[0054] Description of reference numerals:

[0055] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0056] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0057] 100. Power motor;

[0058] 110. Stator; 111. Stator bracket; 112. Stator winding; 113. Bracket assembly; 114. Liquid cooling channel; 115. Liquid cooling chamber; 116. Flow-distributing channel; 1161. Annular channel; 1162. Diverter channel; 117. Winding channel; 118. Winding liquid inlet; 119. Stator core assembly;

[0059] 120, rotor; 121, rotor housing; 122, magnet;

[0060] 130, motor rear cover; 131, liquid inlet channel; 132, liquid supply channel; 133, liquid outlet channel; 1331, first liquid outlet sub-channel; 1332, second liquid outlet sub-channel; 134, low-temperature liquid inlet; 135, low-temperature liquid outlet; 136, high-temperature liquid outlet; 137, high-temperature liquid inlet; 138, rear cover groove; 1381, first opening; 1382, second opening; 139, mounting hole;

[0061] 140, containing cavity;

[0062] 150, first sealing ring;

[0063] 160, second sealing ring;

[0064] 170, third sealing ring;

[0065] 200, liquid pump;

[0066] 210, pump housing; 2111, pump cover; 211, main body; 212, outlet connector; 213, inlet connector; 2112, pump body;

[0067] 220, pump rotor;

[0068] 230, pump chamber;

[0069] 240, drive motor;

[0070] 300, radiator;

[0071] 400, fan;

[0072] 500, liquid inlet pipeline;

[0073] 600, liquid outlet pipeline;

[0074] 700, motor controller; 710, bus capacitor; 720, power motor power module; 730, drive motor power module; 740, drive board; 750, main control board;

[0075] 800, cooling plate; 810, main cooling zone; 810A, first main cooling zone; 810B, second main cooling zone; 811, first cooling cavity; 812, second cooling cavity; 820, auxiliary cooling zone; 820A, first auxiliary cooling zone; 820B, second auxiliary cooling zone; 821, first cooling pipe; 822, second cooling pipe; 830, liquid inlet; 840, liquid outlet. DETAILED DESCRIPTION

[0076] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0077] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0078] In this application, unless otherwise specified or limited, the terms "mounted," "connected," and "fixed" should be understood broadly. For example, they can refer to fixed connections, detachable connections, or integration; direct connections, indirect connections through an intermediate medium, or internal connections between two components or interactions between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0079] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0080] In the above description, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0081] An embodiment of the present application provides an aircraft, which may be an electric vertical take-off and landing (eVTOL) aircraft or other types of aircraft.

[0082] Figure 1 This is a schematic diagram of the three-dimensional structure of an aircraft provided in an embodiment of the present application. Figure 1 The aircraft shown is for illustration only and does not constitute a limitation to the specific structure and shape of the aircraft.

[0083] like Figure 1As shown, the aircraft includes a fuselage 11, wings 12 and a tail 13. Among them, the fuselage 11 is a symmetrical structure, and the remaining structure and shape of the fuselage 11 are not limited and can refer to the fuselage structure of an existing aircraft. The wings 12 are fixedly connected to the fuselage 11 and extend along both sides of the fuselage 11. The wings 12 on both sides are symmetrical with respect to the symmetry plane of the fuselage 11. The structure of the wings 12 can also refer to the fixed wing structure of the existing aircraft, and will not be repeated here. The tail 13 is arranged at the tail of the fuselage 11. The tail 13 is integrally formed with the fuselage 11 or mechanically connected, and has a symmetrical structure. The structure of the tail 13 can also refer to the tail structure of the existing aircraft, and will not be repeated here.

[0084] It should be noted that, in some scenarios, the aircraft may also include a fuselage 11 and wings 12 , that is, the aircraft does not include a tail 13 .

[0085] like Figure 1 As shown, the aircraft further includes an electric propulsion device 20, which can be used to provide power for the aircraft. The number of the electric propulsion device 20 is one or more electric propulsion devices 20, for example Figure 1 As shown, the aircraft includes eight electric propulsion devices 20 .

[0086] The electric propulsion device 20 is arranged on the fuselage 11 and / or the wings 12 and / or the tail 13, for example Figure 1 As shown, electric propulsion devices 20 are symmetrically provided on the wings 12 and the tail 13. Of course, in some scenarios, the electric propulsion devices 20 are provided on the fuselage 11, and the wings 12 and tail 13 are not provided with electric propulsion devices 20. In other scenarios, the electric propulsion devices 20 are provided on the wings 12, and the fuselage 11 and tail 13 are not provided with electric propulsion devices 20. In still other scenarios, the electric propulsion devices 20 are provided on the tail 13, and the fuselage 11 and wings 12 are not provided with electric propulsion devices 20.

[0087] Continue to see Figure 1 As shown, the aircraft further includes an arm 14 and a nacelle 15, both of which are used to connect to an electric propulsion device 20, so as to set the electric propulsion device 20 on the fuselage 11, the wing 12, or the tail 13. Of course, in some scenarios, the aircraft may also include either the arm 14 or the nacelle 15.

[0088] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is disposed on the wing 12 via the arm 14. In other embodiments, the electric propulsion device 20 may also be disposed on the wing 12 via a nacelle 15 (not shown in the figure).

[0089] In some embodiments, as Figure 1As shown, the electric propulsion device 20 is disposed on the tail 13 via the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 via the machine arm 14 (not shown in the figure).

[0090] In some examples, the electric propulsion device 20 provided on the aircraft may include a fixed electric propulsion device 20 a , which is fixedly connected to any one of the fuselage 11 , the wings 12 , and the tail 13 .

[0091] In some examples, the electric propulsion device 20 provided on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is provided between the tilting electric propulsion device 20b and any one of the fuselage 11, wings 12 and tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0092] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20 a.

[0093] In other examples, all electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0094] In some other examples, some of the electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a, and some of the electric propulsion devices 20 are tilting electric propulsion devices 20b, for example. Figure 1 As shown, four of the electric propulsion devices 20 are fixed electric propulsion devices 20a, and the remaining four electric propulsion devices 20 are tilting electric propulsion devices 20b. The fixed electric propulsion devices 20a are arranged on the outside of the tilting electric propulsion devices 20b.

[0095] In this embodiment, the electric propulsion device 20 is composed of a power battery (not shown), an electric motor 21, a propeller 22, and their accessories. The electric motor 21 is a system consisting of a power motor 100, a motor controller 700, cables, and their accessories, which converts electrical energy into mechanical energy. In actual implementation, the electric motor 21 can also be referred to as an electric propulsion system.

[0096] Among them, such as Figure 1 As shown, the electric engine 21 is arranged on the arm 14 or the nacelle 15, and the propeller 22 is arranged on one side of the electric engine 21. The electric engine 21 is transmission-connected to the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate.

[0097] Figure 2 This is a schematic diagram of the structure of an electric propulsion device provided in an embodiment of the present application. Figure 2As shown, the electric engine 21 includes a power motor 100 and a motor controller 700, and the power motor 100 is in transmission connection with the propeller 22. The motor controller 700 is electrically connected to the power motor 100, and the motor controller 700 is used to control the power motor 100 to operate so that the power motor 100 drives the propeller 22 to rotate.

[0098] It should be noted that, in addition to controlling the power motor 100 that drives the propeller 22 to rotate, the motor controller 700 can also be used to control the drive motor 240 and / or the variable pitch motor and / or the fan motor mentioned below.

[0099] like Figure 2 As shown, the motor controller 700 can be disposed inside the stator 110 of the power motor 100 , so as to facilitate fixing the motor controller 700 and facilitate electrical connection between the motor controller 700 and the power motor 100 .

[0100] During operation, the power motor 100 continuously accumulates heat, causing the temperature inside the power motor 100 to continuously increase. Therefore, the electric motor 21 may also be configured with a heat dissipation system to dissipate heat from the electric motor 21 and ensure stable and reliable operation of the electric motor 21.

[0101] The heat dissipation system may include a radiator 300, a liquid pump 200, a fan 400 and a fan motor. The radiator 300 is connected to the power motor 100, and a cooling channel is arranged inside the power motor 100. The cooling channel is communicated with the radiator 300, and the radiator 300 and the cooling channel together form a coolant circulation loop for supplying coolant. The liquid pump 200 can be installed in the housing of the power motor 100, and the liquid pump 200 is used to drive the coolant to circulate in the coolant circulation loop. The fan motor is connected to the fan 400 in a transmission manner, and the fan motor can be installed in the housing of the power motor 100. The fan motor drives the fan 400 to rotate to accelerate the flow of air and blow the air flow toward the radiator 300 to dissipate heat to the radiator 300.

[0102] The liquid pump 200 delivers low-temperature coolant into the cooling channel within the power motor 100. The low-temperature coolant flows along the cooling channel, absorbs heat from the power motor 100 (e.g., heat generated by the stator winding 112), and is converted into high-temperature coolant. The high-temperature coolant flows into the radiator 300 to exchange heat with the air. After the heat exchange, the coolant is converted back into low-temperature coolant. The low-temperature coolant then enters the cooling channel within the power motor 100 through the liquid pump 200, again dissipating heat and cooling the power motor 100. This cycle repeats in a timely manner, thereby removing the heat generated within the power motor 100, keeping the temperature within the power motor 100 within an appropriate range, and ensuring the output power of the power motor 100.

[0103] However, existing cooling systems for electric motors 21 are complex in design, with long cooling pipes, increasing the weight of the coolant in the system and taking up a large amount of space. This limits the lightweighting of electric motors 21, making it difficult to deploy them on an aircraft and impacting the aircraft's aerodynamic design. Furthermore, these cooling systems suffer from low heat dissipation efficiency and poor heat dissipation.

[0104] In view of this, an embodiment of the present application provides an electric engine 21, and designs a heat dissipation system for the electric engine 21. By integrating the structures of the power motor 100, the motor controller 700, the liquid pump 200 and the radiator 300, the space is effectively utilized, making the electric engine 21 more compact. By integrating the cooling channel in the power motor 100, the structural strength of the power motor 100 can be improved while reducing the volume of the power motor 100. By rationalizing the structure of the cooling channel, the heat dissipation efficiency and heat dissipation effect of the heat dissipation system can be improved. The radiator 300 can also be supported and fixed on the power motor 100 using a liquid pipeline.

[0105] The electric motor 21 according to the embodiment of the present application is described in detail below.

[0106] Figure 3 This is a schematic diagram of the working of the heat dissipation system of the electric engine 21 provided in the embodiment of the present application. Figure 3 As shown, the electric engine 21 may include a power motor 100 and a motor controller 700. The motor controller 700 is electrically connected to the power motor 100 to control the operation of the power motor 100. The power motor 100 has a receiving cavity 140, and the motor controller 700 may be located in the receiving cavity 140.

[0107] Among them, the power motor 100 may include a stator 110, a rotor 120 and a motor back cover 130. The stator 110 is fixedly connected to the motor back cover 130. The stator 110 and the motor back cover 130 together form a accommodating cavity 140. The rotor 120 can be arranged on the side of the stator 110 away from the motor back cover 130. For example, the rotor 120 can be arranged outside the stator 110.

[0108] The rotor 120 includes a rotor housing 121 and a magnet 122 connected to the inside of the rotor housing 121 . The rotor housing 121 is fixedly connected to the hub of the propeller 22 , thereby realizing a transmission connection between the power motor 100 and the propeller 22 .

[0109] The electric motor 21 may further include a radiator 300 and a liquid pump 200. The radiator 300 is connected to the power motor 100, for example, the radiator 300 is connected to the motor rear cover 130 of the power motor 100. A liquid pipeline is connected between the radiator 300 and the power motor 100, and a liquid flow channel is arranged inside the power motor 100. The liquid pump 200 is installed on the power motor 100, for example, the liquid pump 200 is installed on the motor rear cover 130 of the power motor 100. The liquid pump 200 is connected to the liquid pipeline between the radiator 300 and the power motor 100, and the liquid pump 200 is used to drive the coolant in the liquid pipeline to circulate between the radiator 300 and the power motor 100.

[0110] The electric engine 21 further includes a fan 400, and the liquid pump 200 includes a drive motor 240. The drive motor 240 serves as the pump motor of the liquid pump 200 itself. The fan 400 is in transmission connection with the drive motor 240. The drive motor 240 is used as the power source of the liquid pump 200 itself and is also used to drive the fan 400 to rotate. In other words, the fan 400 uses the drive motor 240 of the liquid pump 200. Of course, in some scenarios, the electric engine 21 may further include a fan motor. The fan motor may be fixedly connected to the housing of the power motor 100 (e.g., the motor rear cover 130). The fan motor is in transmission connection with the fan 400. The fan motor is used to drive the fan 400 to rotate. In this case, the fan 400 is not in transmission connection with the drive motor 240 of the liquid pump 200.

[0111] The fan 400 rotates to accelerate the flow of ambient air, blow air toward the radiator 300, and accelerate the heat exchange between the radiator 300 and the outside air. Exemplarily, the fan 400 is connected to the side of the drive motor 240 facing the radiator 300 so that the fan 400 blows air directly toward the radiator 300.

[0112] The power motor 100, motor controller 700, radiator 300, liquid pump 200, fan 400, and the liquid pipelines connected between the radiator 300 and the power motor 100 together constitute the cooling system of the electric motor 21. The liquid pump 200 drives the coolant to circulate between the radiator 300 and the power motor 100 to dissipate heat and cool the components within the power motor 100. The fan 400 blows air into the radiator 300, quickly removing heat from the radiator 300 and cooling the coolant within the radiator 300, allowing the coolant to continuously cool the power motor 100.

[0113] In this embodiment, a cooling plate 800 is disposed within the housing cavity 140 of the power motor 100, and some components of the motor controller 700 can be mounted on the surface of the cooling plate 800. Liquid flow channels are formed within the cooling plate 800, and the liquid flow channels within the cooling plate 800 communicate with the radiator 300, allowing coolant to flow along the liquid flow channels within the cooling plate 800. The coolant within the cooling plate 800 exchanges heat with the components mounted on its surface, thereby cooling these components.

[0114] Furthermore, a liquid flow channel is formed in the stator 110 of the power motor 100. The liquid flow channel in the stator 110 is used to cool the stator winding 112 provided in the stator 110. This maintains the stator winding 112 at a suitable ambient temperature, thereby ensuring the operating stability and reliability of the power motor 100 and improving the operating performance of the power motor 100.

[0115] On this basis, a liquid flow channel is also integrated on the motor rear cover 130 of the power motor 100. The liquid flow channel on the motor rear cover 130 is also connected to the radiator 300, and the coolant can flow along the liquid flow channel on the motor rear cover 130. The coolant in the motor rear cover 130 also exchanges heat with the components in the power motor 100 to cool the components in the power motor 100.

[0116] With this arrangement, the radiator 300 communicates with the liquid flow channels within the cooling plate 800, the liquid flow channels within the stator 110, and the liquid flow channels on the motor rear cover 130. This allows the coolant in the liquid pipeline to flow through the cooling plate 800, the stator 110, and the motor rear cover 130, increasing the flow rate of the coolant flowing through the power motor 100 and the flow area of ​​the coolant within the power motor 100, thereby improving the heat dissipation efficiency and effect of the power motor 100.

[0117] like Figure 3 As shown in the direction of the black arrow in the figure, in some examples, the liquid flow channel on the motor back cover 130, the liquid flow channel in the cooling plate 800, and the liquid flow channel in the stator 110 can be connected in series in sequence. After the coolant in the radiator 300 flows out from the liquid pipeline, it flows through the motor back cover 130, the cooling plate 800 and the stator 110 in sequence, and then returns from the stator 110 to the motor back cover 130, and finally flows back from the motor back cover 130 to the radiator 300. In this way, the cooling system has a lower demand on the total flow rate of the coolant, which can reduce the cooling cost. In addition, the pressure generated by the coolant in the liquid flow channel of the power motor 100 is relatively small, and the sealing strength requirement for the liquid flow channel is relatively low. In addition, the demand for the heat dissipation power of the radiator 300 is relatively low, which is conducive to saving the efficiency of the radiator 300.

[0118] In other examples, the liquid flow channel in the cooling plate 800 can also be connected in parallel with the liquid flow channel in the stator 110. After the coolant in the radiator 300 flows through the motor rear cover 130, it is divided into two paths, flowing through the cooling plate 800 and the stator 110 respectively. After merging and returning to the motor rear cover 130, it flows back to the radiator 300 through the liquid pipeline. Alternatively, the liquid flow channel on the motor rear cover 130 can also be connected in parallel with the liquid flow channel in the cooling plate 800. After the coolant in the radiator 300 flows out of the liquid pipeline, it is divided into two paths, flowing through the motor rear cover 130 and the cooling plate 800 respectively. After merging again, it enters the stator 110 and then returns to the radiator 300 from the stator 110. Alternatively, the liquid flow channel on the motor rear cover 130, the liquid flow channel in the cooling plate 800, and the liquid flow channel in the stator 110 are all connected in parallel. After the coolant in the radiator 300 flows out from the liquid pipeline, it is divided into three paths and flows through the motor rear cover 130, the cooling plate 800 and the stator 110 respectively, and then merges from the liquid pipeline and returns to the radiator 300.

[0119] Thus, when the output power is the same, compared to the method in which the motor rear cover 130, cooling plate 800, and stator 110 are connected in series, when the power motor 100 has parallel liquid flow channels, the coolant flows through the parallel liquid flow channels simultaneously, and the cooling system has a higher cooling efficiency for the power motor 100. At the same time, the cooling system requires a greater total flow rate of coolant, and the heat dissipation cost is relatively high. The coolant exerts greater pressure on the liquid flow channels, and the sealing strength requirements of the liquid flow channels are higher. The heat dissipation power requirements of the radiator 300 are also higher.

[0120] The following are all Figure 3 The liquid flow channels of the motor rear cover 130, the liquid flow channels of the cooling plate 800 and the liquid flow channels of the stator 110 are connected in series in sequence. The coolant flows through the motor rear cover 130, the cooling plate 800 and the stator 110 in sequence and then flows back from the motor rear cover 130 to the radiator 300 as an example for explanation.

[0121] Specifically, a liquid outlet pipe 600 and a liquid inlet pipe 500 are connected between the radiator 300 and the power motor 100. The radiator 300 has an outlet end and an inlet end. The inlet end of the liquid outlet pipe 600 is connected to the outlet end of the radiator 300, and the outlet end of the liquid outlet pipe 600 is connected to the liquid flow path of the power motor 100. The inlet end of the liquid inlet pipe 500 is connected to the power motor 100, and the outlet end of the liquid inlet pipe 500 is connected to the inlet end of the radiator 300. The coolant in the radiator 300 flows out from its outlet end, flows into the liquid flow path of the power motor 100 through the liquid outlet pipe 600, exchanges heat with the components in the power motor 100, and then flows back into the radiator 300 from the liquid inlet pipe 500 through the inlet end of the radiator 300.

[0122] When the liquid flow channels of the motor rear cover 130, the cooling plate 800, and the stator 110 are sequentially connected in series, the outlet end of the liquid outlet pipe 600 communicates with the liquid flow channel on the motor rear cover 130, and the inlet end of the liquid inlet pipe 500 also communicates with the liquid flow channel on the motor rear cover 130. At this point, the coolant in the radiator 300 flows into the motor rear cover 130 through the liquid outlet pipe 600. Driven by the liquid pump 200, the coolant flows from the motor rear cover 130, sequentially through the cooling plate 800 and the stator 110, then flows out of the stator 110 and back into the motor rear cover 130, finally flowing back into the radiator 300 through the liquid inlet pipe 500.

[0123] Continue to refer to Figure 3 As shown, the motor controller 700, located in the accommodating cavity 140 surrounded by the stator 110 and the motor rear cover 130, may include a main control board 750, a power module, and a bus capacitor 710. The power module and the bus capacitor 710 are both integrated on the main control board 750. The motor controller 700 may also include a driver board 740, which is integrated on the main control board 750. The power module is disposed on the driver board 740. The main control board 750 controls the driver board 740, and the driver board 740 drives the power module.

[0124] The cooling plate 800 can be used to cool the power module and the bus capacitor 710. For example, the cooling plate 800 can be arranged between the power module and the bus capacitor 710, with at least the power module attached to one side of the cooling plate 800 and the bus capacitor 710 attached to the other side of the cooling plate 800. In this way, the space within the accommodating cavity 140 can be fully and reasonably utilized, and the size of the power motor 100 can be reduced while fully cooling and dissipating heat for the motor controller 700.

[0125] The power module may include a power motor power module 720 and a drive motor power module 730. The power motor power module 720 is used to control the output power of the power motor 100, and the drive motor 240 module is used to control the output power of the drive motor 240. For example, Figure 3 As shown in , the power motor power module 720 and the drive motor power module 730 can be arranged side by side, for example, their side walls can be close together to reduce the space occupied by the power modules. Of course, the drive motor power module 730 can also be arranged on the side where the bus capacitor 710 is located, and this embodiment of the application is not limited to this.

[0126] It should be noted that, in the present embodiment, the drive motor 240 is the pump motor of the liquid pump 200 and also drives the fan 400, that is, the liquid pump 200 and the fan 400 share one motor. At this time, by controlling the output power of the drive motor 240 through the drive motor power module 730, the operation of the fan 400 and the liquid pump 200 can be controlled simultaneously. In some embodiments, the drive motor 240 can also be used only as the pump motor of the liquid pump 200, and a fan motor can be additionally provided to drive the fan 400 through the fan motor. At this time, the power module integrated on the motor controller 700 can also include a fan motor power module, and the output power of the fan motor is controlled by the fan motor power module. The fan motor power module can be set on the same side as the power electric power module, or the fan motor power module and the bus capacitor 710 can be set on the same side.

[0127] In addition, the power module integrated into the motor controller 700 may further include a variable pitch motor power module, which is used to drive a variable pitch mechanism, which is used to control the pitch angle of the blades of the propeller 22. The variable pitch motor power module may be provided on the same side as the power motor power module 720, or the variable pitch motor power module may be provided on the same side as the bus capacitor 710.

[0128] For example, there are two bus capacitors 710 and two power modules. The bus capacitors 710 and the power modules can be arranged in a one-to-one correspondence, and the components on the motor controller 700 are divided into two groups. In this way, when the motor controller 700 is in operation, the two groups of components can operate simultaneously. When one group of components fails to operate normally, the other group of components can still operate normally. Alternatively, one of the two groups of components can be used as a normal group and the other group as a backup group. Normally, the normal group operates, and when the normal group fails to operate normally, the backup group switches to operation.

[0129] In this way, by providing two groups of components, a redundant design is implemented for the motor controller 700. The motor controller 700 has a more flexible working mode and a higher reliability, which can improve the working performance of the electric motor 21.

[0130] Take the power module including the power motor power module 720 and the drive motor power module 730 as an example. Figure 3 As shown in the figure, the two bus capacitors 710 are arranged side by side on both sides of one side of the cooling plate 800, the two power motor power modules 720 can correspond to the two bus capacitors 710 and be arranged side by side on both sides of the other side of the cooling plate 800, and the two drive motor power modules 730 can be respectively arranged on the outside of the two power motor power modules 720.

[0131] Of course, when the power module also includes a variable pitch motor power module, the number of the variable pitch motor power modules can also be two, and the two variable pitch motor power modules can be symmetrically arranged. When the power module also includes a fan motor power module, the number of the fan motor power modules can also be two, and the two fan motor power modules can also be symmetrically arranged.

[0132] Figure 4 This is a schematic diagram of the structure of the electric engine 21 provided in the embodiment of the present application. Figure 4 As shown, the figure shows the liquid outlet pipe 600 and the liquid inlet pipe 500 connected between the radiator 300 and the power motor 100. Among them, the liquid outlet pipe 600 can be connected between the outlet end of the radiator 300 and the motor rear cover 130, and the low-temperature coolant in the radiator 300 flows into the liquid flow channel of the motor rear cover 130 through the liquid outlet pipe 600. The liquid inlet pipe 500 is connected between the inlet end of the radiator 300 and the motor rear cover 130. The high-temperature coolant in the liquid flow channel of the motor rear cover 130 flows back into the radiator 300 through the liquid inlet pipe 500.

[0133] Of course, if the coolant in the power motor 100 does not flow back into the radiator 300 through the motor rear cover 130, the liquid inlet pipe 500 can also be connected to other components in the power motor 100. For example, the inlet end of the liquid inlet pipe 500 is connected to the outlet end of the liquid flow channel of the stator 110.

[0134] Alternatively, when the liquid flow channels on the motor rear cover 130, the liquid flow channels in the cooling plate 800, and the liquid flow channels in the stator 110 are all connected in parallel, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can both serve as main pipelines, and the liquid outlet pipeline 600 can be respectively connected to the motor rear cover 130, the cooling plate 800 and the stator 110 through each liquid outlet branch pipe, and the liquid inlet pipeline 500 can be respectively connected to the motor rear cover 130, the cooling plate 800 and the stator 110 through each liquid inlet branch pipe.

[0135] In this embodiment, at least one of the liquid outlet pipe 600 and the liquid inlet pipe 500 can serve as a support structure. While connecting the radiator 300 to the liquid flow path within the power motor 100, at least one of the liquid outlet pipe 600 and the liquid inlet pipe 500 can also be used to fixedly connect the radiator 300 to the housing of the power motor 100. In other words, the radiator 300 is rigidly connected to the housing of the power motor 100 via the liquid outlet pipe 600 and / or the liquid inlet pipe 500. For example, the radiator 300 is fixedly connected to the motor rear cover 130 via the liquid outlet pipe 600 and the liquid inlet pipe 500, or the radiator 300 is fixedly connected to the stator 110 via the liquid outlet pipe 600 and the liquid inlet pipe 500. In this way, there is no need to provide additional support structures or connection structures to connect the radiator 300 to the power motor 100, which can simplify the structure of the electric motor 21 and reduce the manufacturing cost of the electric motor 21.

[0136] The liquid outlet pipe 600 and / or the liquid inlet pipe 500, which serve as support structures, can be made of metal or hard plastic. The liquid outlet pipe 600 and / or the liquid inlet pipe 500 are rigid pipes. In other words, the liquid outlet pipe 600 and / or the liquid inlet pipe 500 are rigid pipes. This provides high structural strength for the liquid outlet pipe 600 and / or the liquid inlet pipe 500, meeting the support requirements between the radiator 300 and the power motor 100. For example, both the liquid outlet pipe 600 and the liquid inlet pipe 500 can be rigid pipes.

[0137] Continue to refer to Figure 4 The number of the liquid outlet pipes 600 and the number of the liquid inlet pipes 500 can both be at least two, and the number of the liquid outlet pipes 600 and the number of the liquid inlet pipes 500 can be the same. The liquid outlet pipes 600 and the liquid inlet pipes 500 can be spaced apart along the circumference of the power motor 100. In this arrangement, a larger number of liquid outlet pipes 600 and liquid inlet pipes 500 are connected between the radiator 300 and the power motor 100, and the flow rate of the coolant circulating between the radiator 300 and the power motor 100 can be larger, thereby improving the cooling effect of the power motor 100. Moreover, when the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 can also play a supporting role, by increasing the number of the liquid outlet pipeline 600 and the liquid inlet pipeline 500, and arranging the liquid outlet pipeline 600 and the liquid inlet pipeline 500 at intervals along the circumference of the power motor 100, the support of the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 to the radiator 300 can be enhanced, ensuring that the radiator 300 is firmly and stably connected to the power motor 100.

[0138] Furthermore, the liquid outlet pipes 600 and the liquid inlet pipes 500 can be arranged alternately around the circumference of the power motor 100. This facilitates the design of the liquid flow channel on the motor rear cover 130, increases the extension length of the liquid flow channel on the motor rear cover 130, and makes the liquid flow channel more evenly distributed on the motor rear cover 130. This can make the temperature of the motor rear cover 130 more balanced, improving the cooling effect of the power motor 100. Furthermore, the coolant in the liquid flow channel exerts a more uniform force on the motor rear cover 130, which can improve the stability and reliability of the motor rear cover 130.

[0139] In addition, if Figure 4 As shown in , along the axial direction of the power motor 100, the fan 400 can be located between the power motor 100 and the radiator 300. The fan 400 may include a hub (not shown), a hood and blades (not shown). A plurality of blades are arranged around the hub, one end of the blade is fixedly connected to the hub, and the other end of the blade serves as a free end. The hub and the blade are both located inside the hood, and the hub is used to be connected to the drive motor 240 or the fan motor in a transmission manner. The hood of the fan 400 can be connected to the radiator 300, and the hood of the fan 400 is fixed by the radiator 300. Wherein, when the drive motor 240 drives the fan 400 and the liquid pump 200 at the same time, the first output end of the drive motor 240 in the axial direction can be fixedly connected to the hub of the fan 400, and the second output end of the drive motor 240 in the axial direction can be connected in a transmission manner to the pump rotor 220 of the liquid pump 200.

[0140] Figure 5 This is a schematic diagram of the structure of the motor rear cover 130 provided in the embodiment of the present application. Figure 5 As shown, the motor rear cover 130 is integrated with a liquid inlet channel 131 and a liquid supply channel 132. The motor rear cover 130 is also provided with a low-temperature liquid inlet 134 and a low-temperature liquid outlet 135. The liquid outlet pipeline 600 connected to the radiator 300 is in communication with the low-temperature liquid inlet 134 on the motor rear cover 130. The low-temperature liquid inlet 134 is in communication with the liquid inlet channel 131, and the outlet of the liquid inlet channel 131 is in communication with the inlet of the liquid pump 200. The outlet of the liquid pump 200 is in communication with the inlet of the liquid supply channel 132, and the low-temperature liquid outlet 135 is in communication with the liquid supply channel 132. The low-temperature liquid outlet 135 can serve as the outlet of the liquid supply channel 132, and the inlet of the cooling plate 800 can be in communication with the low-temperature liquid outlet 135.

[0141] After the low-temperature coolant flows out of the radiator 300 through the liquid outlet pipe 600, it flows into the liquid inlet channel 131 through the low-temperature liquid inlet on the motor rear cover 130. Figure 5 As shown by the black arrow in the liquid inlet channel 131, under the driving action of the liquid pump 200, the low-temperature coolant flows along the liquid inlet channel 131 and enters the liquid pump 200 from the inlet end of the liquid pump 200. Figure 5As indicated by the black arrows in the liquid supply channel 132, the coolant flows from the outlet of the liquid pump 200, enters the inlet of the liquid supply channel 132, flows along the liquid supply channel 132, and then flows out of the low-temperature liquid outlet 135. The low-temperature coolant flowing out of the low-temperature liquid outlet 135 flows into the cooling plate 800, cooling heat-generating components such as the busbar capacitor 710 and the power module. The low-temperature coolant then flows into the stator 110, cooling components such as the stator winding 112.

[0142] It is understood that the above description describes a method in which the liquid flow channels within the cooling plate 800 and the liquid flow channels within the stator 110 are connected in series. When the liquid flow channels within the cooling plate 800 and the liquid flow channels within the stator 110 are connected in parallel, the inlet end of the cooling plate 800 and the inlet end of the stator 110 can be connected to the low-temperature liquid outlet 135 on the motor rear cover 130, respectively. At this time, the low-temperature coolant flowing out of the low-temperature liquid outlet 135 flows into the cooling plate 800 and the stator 110, respectively, cooling heat-generating components such as the busbar capacitor 710, the power module, and the stator winding 112.

[0143] Continue to refer to Figure 5 As shown, the motor rear cover 130 also integrates a liquid outlet channel 133. The motor rear cover 130 also includes a high-temperature liquid inlet 137 and a high-temperature liquid outlet 136. The high-temperature liquid inlet 137 can communicate with the outlet end of the stator 110 and is also connected to the liquid outlet channel 133, serving as the inlet end of the liquid outlet channel 133. The high-temperature liquid outlet 136 is also connected to the liquid outlet channel 133, serving as the outlet end of the liquid outlet channel 133. The liquid inlet line 500 connected to the radiator 300 can communicate with the high-temperature liquid outlet 136.

[0144] After cooling the heat-generating components such as the busbar capacitor 710, the power module, and the stator winding 112, the high-temperature coolant flows out from the outlet end of the stator 110 and enters the liquid outlet channel 133 of the motor rear cover 130 through the high-temperature liquid inlet 137. Figure 5 As shown by the black arrow in the middle liquid outlet channel 133, the high-temperature coolant flows along the liquid outlet channel 133, then flows out from the high-temperature liquid outlet 136, and flows back to the radiator 300 through the liquid inlet pipe 500. The radiator 300 cools the high-temperature coolant into low-temperature coolant.

[0145] Similarly, the above description also describes a method in which the liquid flow channels within the cooling plate 800 and the liquid flow channels within the stator 110 are connected in series, and the coolant then flows back to the motor rear cover 130. When the liquid flow channels within the cooling plate 800 and the liquid flow channels within the stator 110 are connected in parallel, the coolant flowing out of the cooling plate 800 and the coolant flowing out of the stator 110 can mix and then enter the liquid outlet channel 133 through the high-temperature liquid inlet 137.

[0146] Continue to refer to Figure 5 As shown, as an example, the motor rear cover 130 may be integrated with a liquid inlet channel 131, which may extend from the middle of the motor rear cover 130 to opposite edges of the motor rear cover 130. In this way, the liquid inlet channel 131 has a longer extension length and occupies a larger radial area of ​​the motor rear cover 130, thereby achieving a better cooling effect on the motor rear cover 130.

[0147] On this basis, the liquid inlet channel 131 can be disposed near the middle area of ​​the motor rear cover 130 to reduce the distance between the liquid inlet channel 131 and the liquid pump 200 installed in the center of the motor rear cover 130, thereby facilitating communication between the outlet end of the liquid inlet channel 131 and the inlet end of the liquid pump 200. For example, the liquid inlet channel 131 can extend along an arc, with both ends of the liquid inlet channel 131 approximately located on the same radial line of the motor rear cover 130, and the middle portion of the liquid inlet channel 131 avoiding the liquid pump 200 located in the center of the motor rear cover 130.

[0148] At this time, the low-temperature liquid inlet 134 can be opened at both ends of the liquid inlet channel 131 in the longitudinal direction, and an opening is opened in the middle of the liquid inlet channel 131, which serves as the outlet end of the liquid inlet channel 131 and is connected to the inlet end of the liquid pump 200. In this way, coolant is simultaneously transported into the liquid inlet channel 131 from the low-temperature liquid inlets 134 at both ends. The flow rate and flow rate of the coolant in the liquid inlet channel 131 are large, and the flow rate is fast, which can improve the cooling efficiency and cooling effect of the power motor 100. In addition, the distance between the middle of the liquid inlet channel 131 and the liquid pump 200 is the smallest, and the liquid pump 200 has a better driving effect on the coolant in the liquid inlet channel 131, so that the coolant can quickly pass through the liquid pump 200 and enter the liquid supply channel 132. In addition, the liquid outlet pipe 600 connected to the radiator 300 can be connected to the low-temperature liquid inlet 134 near the edge of the motor rear cover 130. When the liquid outlet pipe 600 is a rigid pipe, the liquid outlet pipe 600 can provide better support between the radiator 300 and the power motor 100.

[0149] The motor rear cover 130 may also be integrated with a liquid supply channel 132, which may extend approximately in a straight line. One end of the liquid supply channel 132 may be located near the center of the motor rear cover 130, with this end serving as its inlet and communicating with the outlet of the liquid pump 200. The other end of the liquid supply channel 132 may be located away from the center of the motor rear cover 130, with this end serving as its outlet and communicating with the cooling plate 800.

[0150] Two liquid outlet channels 133 may be integrated on the motor back cover 130, and the two liquid outlet channels 133 may be located on either side of the liquid inlet channel 131. The extension trend of the liquid outlet channel 133 may be consistent with the extension trend of the liquid inlet channel 131, and the liquid outlet channel 133 also extends from the middle of the motor back cover 130 to the two side edges of the motor back cover 130. The liquid outlet channel 133 may be arranged biased toward the two side edges of the motor back cover 130, and the liquid inlet channel 131 and the liquid supply channel 132 are both located between the two liquid outlet channels 133. In this way, the high-temperature coolant flowing back into the motor back cover 130 is concentrated in the edge area of ​​the motor back cover 130, which has less impact on the overall cooling level of the motor back cover 130.

[0151] Exemplarily, the liquid outlet channel 133 may include a first liquid outlet sub-channel 1331 and a second liquid outlet sub-channel 1332. The first liquid outlet sub-channel 1331 may serve as the liquid outlet section of the liquid outlet channel 133, and the second liquid outlet sub-channel 1332 may serve as the confluence section of the liquid outlet channel 133. One end of the first liquid outlet sub-channel 1331 is connected to the middle of the second liquid outlet sub-channel 1332, and the other end of the first liquid outlet sub-channel 1331 is away from the second liquid outlet sub-channel 1332. Both ends of the second liquid outlet sub-channel 1332 extend toward the side edges of the motor rear cover 130. In addition, the first liquid outlet sub-channel 1331 can be connected to the side of the second liquid outlet sub-channel 1332 close to the edge of the motor back cover 130, the second liquid outlet sub-channel 1332 can extend along an arc shape, and the middle part of the second liquid outlet sub-channel 1332 can protrude toward the center of the motor back cover 130 to reserve sufficient extension space for the first liquid outlet sub-channel 1331.

[0152] At this time, the high-temperature liquid inlet 137 can be opened at both ends of the extension direction of the second liquid outlet sub-channel 1332, and the high-temperature liquid inlet 137 is connected to both ends of the second liquid outlet sub-channel 1332. The high-temperature liquid outlet 136 can be opened at one end of the first liquid outlet sub-channel 1331 away from the second liquid outlet sub-channel 1332, and the high-temperature liquid outlet 136 is connected to the end of the first liquid outlet sub-channel 1331. In this way, the high-temperature coolant flowing out of the stator 110 enters the liquid outlet channel 133 simultaneously from the high-temperature liquid inlets 137 at both ends. The coolant in the liquid outlet channel 133 has a large flow rate and a fast flow rate, which can accelerate the circulation of the coolant in the power motor 100 and improve the cooling efficiency of the power motor 100. In addition, the high-temperature liquid outlet 136 is closer to the edge of the motor rear cover 130, and the liquid inlet pipe 500 connected to the radiator 300 is connected to the high-temperature liquid outlet 136. When the liquid inlet pipe 500 is a rigid pipe, the liquid inlet pipe 500 can provide better support between the radiator 300 and the power motor 100.

[0153] As previously mentioned, the motor rear cover 130 is provided with a liquid inlet channel 131, which is located in the middle of the motor rear cover 130. Low-temperature liquid inlets 134 are provided at both ends of the liquid inlet channel 131. In addition, the motor rear cover 130 is provided with two liquid outlet channels 133, which are located on both sides of the liquid inlet channel 131 and close to the edge of the motor rear cover 130. High-temperature liquid inlets 137 are provided at both ends of the two liquid outlet channels 133, and high-temperature liquid outlets 136 are provided in the middle. At this time, the motor rear cover 130 is provided with two low-temperature liquid inlets 134, four high-temperature liquid inlets 137, and two high-temperature liquid outlets 136. The two low-temperature liquid inlets 134 are approximately located on one radial line, and the two high-temperature liquid outlets 136 are approximately located on another radial line, and the two radial lines are approximately perpendicular. Correspondingly, two liquid outlet pipes 600 and two liquid inlet pipes 500 are connected between the radiator 300 and the power motor 100. The two liquid outlet pipes 600 and the two liquid inlet pipes 500 are arranged at approximately uniform intervals along the circumference of the power motor 100, and the liquid outlet pipes 600 and the liquid inlet pipes 500 alternate in sequence.

[0154] Of course, provided that there is sufficient space on the motor rear cover 130, two, three, or even more liquid inlet channels 131 may be provided on the motor rear cover 130, and three, four, or even more liquid outlet channels 133 may be provided on the motor rear cover 130. The number of low-temperature liquid inlets 134 provided on the motor rear cover 130 may also be three, four, or even more, the number of high-temperature liquid inlets 137 may also be five, six, or even more, and the number of high-temperature liquid outlets 136 may also be three, four, or even more. Alternatively, only one liquid outlet channel 133 may be provided on the motor rear cover 130, and the number of low-temperature liquid inlets 134, high-temperature liquid inlets 137, and high-temperature liquid outlets 136 provided on the motor rear cover 130 may also be fewer. This embodiment does not impose any specific restrictions on this.

[0155] As for the formation of the liquid flow channel on the motor back cover 130, a main board body can be set as the main support structure of the motor back cover 130, and one or more sub-board bodies can be set on one side surface of the main board body. The sub-board bodies and the main board body together form a liquid inlet channel 131, a liquid supply channel 132 and a liquid outlet channel 133.

[0156] Since the liquid flow channel is integrated into the motor back cover 130, the liquid flow channel can form a raised reinforcement structure on the motor back cover 130, which can enhance the structural strength of the motor back cover 130. In addition, the liquid flow channel is sealed by plate-to-plate bonding, which can simplify the sealing structure of the liquid flow channel and enhance the sealing performance of the liquid flow channel. In addition, the layout of additional liquid pipelines inside the power motor 100 is avoided, which can simplify the internal structure of the power motor 100, make the internal layout structure of the power motor 100 more reasonable, and help reduce the volume of the power motor 100 and improve the reliability of the power motor 100.

[0157] Figure 6a for Figure 4 A schematic cross-sectional view of the electric engine shown, Figure 6b This is a partial structural diagram of the liquid pump 200 provided in the embodiment of the present application integrated into the motor rear cover 130. Figures 5 to 6b As shown, the motor rear cover 130 is provided with a mounting hole 139, through which the liquid pump 200 can be connected to the motor rear cover 130, thereby integrating the liquid pump 200 with the motor rear cover 130. In this way, the liquid pump 200 is directly fixed to the motor rear cover 130, eliminating the need for other structures within the power motor 100 to support and fix the liquid pump 200. This can reduce the number of components in the electric motor 21 and achieve a lighter electric motor 21. Furthermore, the integration of the liquid pump 200 on the motor rear cover 130 can reduce the space occupied by the liquid pump 200 and reduce the overall volume of the electric motor 21.

[0158] Specifically, refer to Figure 6a and Figure 6b As shown, the liquid pump 200 may include a pump housing 210 and a pump rotor 220. The pump housing 210 is fixedly connected to the motor rear cover 130. For example, the pump housing 210 is connected to the motor rear cover 130 through the mounting hole 139 on the motor rear cover 130. The pump rotor 220 is located in the pump housing 210. The aforementioned drive motor 240 (or pump motor) is in transmission connection with the pump rotor 220. The drive motor 240 (or pump motor) drives the pump rotor 220 to rotate, thereby enabling the liquid pump 200 to drive the coolant to flow in the liquid flow channel of the motor rear cover 130.

[0159] The liquid pump 200, integrated into the motor rear cover 130, has a pump chamber 230. The inlet of the pump chamber 230 communicates with the outlet of the liquid inlet channel 131 on the motor rear cover 130, and the outlet of the pump chamber 230 communicates with the inlet of the liquid supply channel 132 on the motor rear cover 130. The pump rotor 220 of the liquid pump 200 rotates, driving the coolant in the liquid inlet channel 131 into the liquid pump 200 through the inlet of the pump chamber 230. The coolant then flows into the liquid supply channel 132 through the outlet of the pump chamber 230.

[0160] Continue to refer to Figure 6a and Figure 6b In this embodiment, the motor back cover 130 has a back cover groove 138, which is arranged corresponding to the liquid pump 200. For example, the back cover groove 138 is located in the central area of ​​the motor back cover 130. The back cover groove 138 is recessed toward the side of the motor back cover 130 that faces away from the stator 110 (or the side of the motor back cover 130 that faces the radiator 300), and part of the structure of the liquid pump 200 is located within the back cover groove 138. In this way, the liquid pump 200 is integrated into the motor back cover 130 in an embedded manner. The liquid pump 200 does not completely occupy the height space of the power motor 100 alone, but shares part of the height space of the power motor 100 with the motor back cover 130. As a result, the height space of the power motor 100 can be saved, and the structural layout of the power motor 100 is more compact, which is conducive to the miniaturization of the electric engine 21.

[0161] Two hollow flow channels are formed within the bottom of the rear cover groove 138, and the two hollow flow channels are separated from each other. For example, a recessed portion (not shown) is formed in the middle area of ​​the bottom of the rear cover groove 138. The recessed portion is recessed from the outer wall of the motor rear cover 130 toward the inner wall of the motor rear cover 130, and the recessed portion separates the two hollow flow channels formed within the bottom of the rear cover groove 138. One of the hollow flow channels is connected to the liquid inlet channel 131, or in other words, it serves as a part of the liquid inlet channel 131. The other hollow flow channel is connected to the liquid supply channel 132, or in other words, it serves as a part of the liquid supply channel 132.

[0162] And, refer to Figure 6a and Figure 6b As shown, the bottom of the rear cover groove 138 has a first opening 1381 and a second opening 1382, which are open toward the inner wall of the motor rear cover 130. The first opening 1381 is connected to a hollow channel, and the first opening 1381 is connected to the liquid inlet channel 131 through the hollow channel. For example, the first opening 1381 serves as the outlet of the liquid inlet channel 131. The second opening 1382 is connected to another hollow channel, and the second opening 1382 is connected to the liquid supply channel 132 through the hollow channel. For example, the second opening 1382 serves as the inlet of the liquid supply channel 132. The first opening 1381 is connected to the inlet of the pump chamber 230, and the second opening 1382 is connected to the outlet of the pump chamber 230. This allows the coolant in the liquid inlet channel 131 to enter the liquid pump 200 through the first opening 1381, and the coolant in the liquid pump 200 to enter the liquid supply channel 132 through the second opening 1382.

[0163] As for the pump chamber 230 formed by the liquid pump 200, refer to Figure 6a and Figure 6bAs shown, as an embodiment, the liquid pump 200 itself forms a pump chamber 230. Specifically, the pump housing 210 may include a pump body 2112 and a pump cover 2111, and the pump body 2112 and the pump cover 2111 enclose the pump chamber 230. For example, except for the opening that needs to be connected to the motor back cover 130, the pump housing 210 itself is formed into a relatively complete enveloping structure, enclosing the pump rotor 220. At this time, the pump cover 2111 is formed with an inlet end and an outlet end of the pump chamber 230. The pump cover 2111 can be placed against the bottom of the back cover groove 138. The inlet end of the pump cover 2111 is correspondingly connected to the first opening 1381 of the back cover groove 138, and the outlet end of the pump cover 2111 can be correspondingly connected to the second opening 1382 of the back cover groove 138.

[0164] As another embodiment, the liquid pump 200 and the motor rear cover 130 jointly form a pump cavity 230. Specifically, the pump body 2112 of the liquid pump 200 and the motor rear cover 130 form the pump cavity 230. For example, the end of the pump body 2112 facing the motor rear cover 130 can be an open end, and the pump body 2112 abuts against the inner wall surface of the motor rear cover 130 located outside the rear cover groove 138. Alternatively, the pump body 2112 extends into the rear cover groove 138, and the outer wall of the pump body 2112 abuts against the inner wall of the rear cover groove 138. Alternatively, the end surface of the pump body 2112 abuts against the bottom of the rear cover groove 138. The pump body 2112 covers the notch of the rear cover groove 138, and the pump rotor 220 at least partially extends into the rear cover groove 138. The pump body 2112 and the rear cover groove 138 of the motor rear cover 130 (or the portion of the inner wall surface outside the rear cover groove 138) together form a pump chamber 230. In this case, the first opening 1381 at the bottom of the rear cover groove 138 can directly serve as the inlet end of the pump chamber 230, and the second opening 1382 can directly serve as the outlet end of the pump chamber 230.

[0165] As for the specific structure of the pump housing 210, in some embodiments, as Figure 6a and Figure 6b As shown, the pump housing 210 may include a pump body 2112 and a pump cover 2111. The pump body 2112 is open at one end facing the motor rear cover 130, and the pump cover 2111 is connected to the end of the pump body 2112, covering the open end of the pump body 2112. Together, the pump body 2112 and the pump cover 2111 form a pump chamber 230 of the pump housing 210, facilitating the installation of the pump rotor 220 into the pump housing 210.

[0166] The pump body 2112 partially extends into the rear cover groove 138, and in the axial direction of the power motor 100, the pump body 2112 abuts against the bottom of the rear cover groove 138. The portion of the outer wall of the pump body 2112 located within the rear cover groove 138 can abut against the inner wall of the rear cover groove 138. Of course, in some scenarios, the pump body 2112 can also be extended into the rear cover groove 138.

[0167] like Figure 6a and Figure 6b As shown, the pump cover 2111 includes a main body 211, an inlet connector 213, and an outlet connector 212. The inlet connector 213 and the outlet connector 212 can be disposed on one end surface of the main body 211 facing the bottom of the rear cover groove 138. The inlet connector 213 is provided with an opening that communicates with the first opening 1381 on the bottom of the rear cover groove 138. The opening on the inlet connector 213 serves as the inlet end of the pump chamber 230. The outlet connector 212 is provided with an opening that communicates with the second opening 1382 on the bottom of the rear cover groove 138. The opening on the outlet connector 212 serves as the outlet end of the pump chamber 230.

[0168] It should be noted that Figure 6b As a reference, in this embodiment, the first opening 1381 is located on the left side of the rear cover groove 138 and the second opening 1382 is located on the right side of the rear cover groove 138. Correspondingly, the inlet joint portion 213 is located on the left side of the pump cover 2111 and the outlet joint portion 212 is located on the right side of the pump cover 2111. Of course, the first opening 1381 can also be located on the right side of the rear cover groove 138 and the second opening 1382 is located on the left side of the rear cover groove 138. Correspondingly, the inlet joint portion 213 is located on the right side of the pump cover 2111 and the outlet joint portion 212 is located on the left side of the pump cover 2111.

[0169] For example, the outer contour of the inlet connector 213 can be smaller than the opening size of the first opening 1381. The inlet connector 213 is inserted into the first opening 1381 to achieve communication between the inlet end of the pump chamber 230 and the liquid inlet channel 131. Similarly, the outer contour of the outlet connector 212 can also be smaller than the opening size of the second opening 1382. The outlet connector 212 is inserted into the second opening 1382 to achieve communication between the outlet end of the pump chamber 230 and the liquid supply channel 132.

[0170] The inlet joint portion 213 and the outlet joint portion 212 may be integrally formed on the main body portion 211 , or the inlet joint portion 213 and the outlet joint portion 212 may be independently formed and mounted on the main body portion 211 .

[0171] In order to improve the sealing between the liquid pump 200 and the motor rear cover 130, a first sealing ring 150 can be sleeved on the outer wall of the inlet joint portion 213. Along the axial direction of the power motor 100, the first sealing ring 150 abuts between the end face of the main body portion 211 and the bottom of the rear cover groove 138 to seal the connection between the inlet end of the pump chamber 230 and the first opening 1381. Similarly, a second sealing ring 160 can be sleeved on the outer wall of the outlet joint portion 212. Along the axial direction of the power motor 100, the second sealing ring 160 abuts between the end face of the main body portion 211 and the bottom of the rear cover groove 138 to seal the connection between the outlet end of the pump chamber 230 and the second opening 1382.

[0172] In addition, the connection between the pump body 2112 and the pump cover 2111 can also be sealed. A third sealing ring 170 can be abutted between the end faces of the pump body 2112 and the pump cover 2111. The third sealing ring 170 seals the gap between the pump body 2112 and the pump cover 2111, thereby sealing the pump cavity 230 formed in the pump housing 210.

[0173] Figure 7a This is a schematic diagram of the structure of the cooling plate 800 provided in an embodiment of the present application. Figure 7b for Figure 7a The three-dimensional structure diagram of the cooling plate and the motor controller is shown. Figure 7a As shown, in this embodiment, the cooling plate 800 for cooling the components of the motor controller 700 may be an integrated structure. Figure 7b As shown, the motor controller 700 is cooled by a cooling plate 800, which has a simple structure, facilitates the assembly and disassembly of the power motor 100 as a whole, and also facilitates the piping design of the heat dissipation system. It can improve the production efficiency of the electric motor 21 and reduce the production cost of the electric motor 21.

[0174] The cooling plate 800 can be made of metal material, which can improve the structural strength of the cooling plate 800 while ensuring the thermal conductivity of the cooling plate 800, thereby meeting the overall reliability requirements of the power motor 100.

[0175] Reference Figure 7a As shown, the cooling plate 800 includes a main cooling zone 810 and a secondary cooling zone 820. The main cooling zone 810 is connected to the secondary cooling zone 820, and the secondary cooling zone 820 is connected to the peripheral side of the main cooling zone 810. Figure 7a As shown, the shape of the main cooling zone 810 is a rectangle. Of course, the shape of the main cooling zone 810 can also be other shapes, such as a pentagon. Figure 7aAs shown, the auxiliary cooling zone 820 is curved. Of course, the auxiliary cooling zone 820 may also be in other shapes, such as a wave shape, etc. Therefore, the shapes of the primary cooling zone 810 and the auxiliary cooling zone 820 are not specifically limited here.

[0176] Reference Figure 7a As shown, the cooling plate 800 has a liquid inlet 830 and a liquid outlet 840. The liquid inlet 830 is used to allow coolant to enter the interior of the cooling plate 800, and the liquid outlet 840 is used to allow coolant to flow out of the cooling plate 800. The liquid inlet 830 can be located in the auxiliary cooling zone 820 or the main cooling zone 810, and the liquid outlet 840 can be located in the main cooling zone 810 or the auxiliary cooling zone 820. The coolant entering the cooling plate 800 through the liquid inlet 830 flows through the main cooling zone 810 and the auxiliary cooling zone 820 and then flows out of the cooling plate 800 through the liquid outlet 840.

[0177] There is no limitation on the number of primary cooling zones 810 and secondary cooling zones 820. Figure 7a As shown, there are two primary cooling zones 810 and two secondary cooling zones 820. For ease of description, in this embodiment, the two primary cooling zones 810 are defined as a first primary cooling zone 810A and a second primary cooling zone 810B, and the two secondary cooling zones 820 are defined as a first secondary cooling zone 820A and a second secondary cooling zone 820B.

[0178] Specifically, the first main cooling zone 810A and the second main cooling zone 810B can be separated, for example, the first main cooling zone 810A and the second main cooling zone 810B are spaced apart along the length direction of the cooling plate 800. The first auxiliary cooling zone 820A and the second auxiliary cooling zone 820B can be connected to the sides of the two main cooling zones 810, for example, the first auxiliary cooling zone 820A and the second auxiliary cooling zone 820B are respectively located on opposite sides of the width direction of the cooling plate 800. Figure 7a Taking the paper direction shown in as a reference, the first main cooling zone 810A is located on the upper side of the cooling plate 800 in the length direction, the second main cooling zone 810B is located on the lower side of the cooling plate 800 in the length direction, the first auxiliary cooling zone 820A is located on the left side of the cooling plate 800 in the width direction, and the second auxiliary cooling zone 820B is located on the right side of the cooling plate 800 in the width direction.

[0179] The power motor power module 720 in the motor controller 700 is attached to one side of the cooling plate 800. When the motor controller 700 is configured with two power motor power modules 720, the two power motor power modules 720 are respectively provided to correspond to the two main cooling zones 810. For example, the main cooling zone 810 can completely cover the surface of the power motor power module 720, and the two power motor power modules 720 are respectively attached to the two main cooling zones 810.

[0180] On this basis, a side surface of the cooling plate 800 for fitting the power motor power module 720 can be formed with a receiving groove (not shown in the figure), and at least part of the thickness of the power motor power module 720 is located in the receiving groove. For example, the two main cooling zones 810 each have a receiving groove, and the two power motor power modules 720 are respectively arranged in the two receiving grooves. In this way, the position of the power motor power module 720 on the cooling plate 800 can be positioned. In addition, the overall height of the power motor power module 720 after assembly with the cooling plate 800 can be reduced, and the overall height of the power motor 100 can be reduced, which is conducive to the lightweight design of the electric engine 21.

[0181] like Figure 7b As shown, the bus capacitor 710 in the electric controller is attached to the other side of the cooling plate 800. When the motor controller 700 is configured with two bus capacitors 710, the two bus capacitors 710 are respectively provided for the two main cooling zones 810. It can be seen that the bus capacitor 710 and the power motor power module 720 are respectively located on both sides of the main cooling zone 810, and the main cooling zone 810 is used to dissipate heat from the bus capacitor 710 and the power motor power module 720.

[0182] Figure 7a FIG3 shows a case where the surface area of ​​the busbar capacitor 710 is large, and the edges of the two busbar capacitors 710 extend beyond the ends of the length direction of the cooling plate 800. In other words, the busbar capacitor 710 can completely cover the main cooling zone 810, and the busbar capacitor 710 extends beyond the main cooling zone 810. In this case, the surface of the cooling plate 800 on one side for fitting the busbar capacitor 710 can be an integral planar structure, so that the busbar capacitor 710 extending outside the cooling plate 800 can fit as much as possible on the surface of the cooling plate 800, thereby increasing the contact area between the busbar capacitor 710 and the cooling plate 800.

[0183] When the surface area of ​​the bus capacitor 710 is small, the two bus capacitors 710 can also be completely located in the coverage area of ​​the cooling plate 800. For example, the main cooling zone 810 can completely cover the bus capacitor 710, and the bus capacitor 710 can be completely located in the main cooling zone 810. At this time, a storage groove can also be formed on one side of the plate surface of the cooling plate 800 for fitting the bus capacitor 710, and at least part of the thickness of the bus capacitor 710 is located in the storage groove. For example, both main cooling zones 810 have a storage groove, and the two bus capacitors 710 are respectively arranged in the two storage grooves. No further details will be given here.

[0184] The drive motor power module 730 in the electric controller can be arranged corresponding to the auxiliary cooling zone 820 of the cooling plate 800, and the drive motor power module 730 is attached to the auxiliary cooling zone 820. Therefore, it can be seen that along the thickness direction of the cooling plate 800, the drive motor power module 730 is located on one side of the auxiliary cooling zone 820, and the auxiliary cooling zone 820 is used to dissipate heat from the drive motor power module 730.

[0185] When the motor controller 700 is configured with two drive motor power modules 730, the two drive motor power modules 730 can be respectively attached to the two auxiliary cooling zones 820. The drive motor power modules 730 are generally small in size and generate less heat. The area of ​​the auxiliary cooling zone 820 is sufficient to cool the drive motor power modules 730 and make the internal layout structure of the power motor 100 more compact.

[0186] In addition, a first heat-conducting layer (not shown) may be provided between the drive motor power module 730 and the cooling plate 800, through which the heat of the drive motor power module 730 is quickly transferred to the cooling plate 800. In particular, when the drive motor power module 730 is attached to the auxiliary cooling zone 820, due to the shape and structure of the auxiliary cooling zone 820, the surface flatness of the auxiliary cooling zone 820 is relatively low. The first heat-conducting layer can compensate for surface defects such as pits and protrusions in the auxiliary cooling zone 820, so that the drive motor power module 730 is tightly attached to the auxiliary cooling zone 820, thereby improving the heat dissipation effect of the cooling plate 800 on the drive motor power module 730.

[0187] Similarly, thermally conductive layers may be provided between other components of the motor controller 700 and the cooling plate 800. For example, a second thermally conductive layer may be provided between the bus capacitor 710 and the cooling plate 800, and a third thermally conductive layer may be provided between the power motor power module 720 and the cooling plate 800. These details will not be repeated here.

[0188] like Figure 7aAs shown by the black arrows in the figure, as an embodiment, the liquid flow channels in the cooling plate 800 are connected in series. For example, the inlet of the first auxiliary cooling zone 820A serves as the liquid inlet 830 of the cooling plate 800. The inlet of the first auxiliary cooling zone 820A can be connected to the low-temperature liquid outlet 135 of the motor rear cover 130. The outlet of the first auxiliary cooling zone 820A is connected to the inlet of the first main cooling zone 810A, the outlet of the first main cooling zone 810A is connected to the inlet of the second auxiliary cooling zone 820B, and the outlet of the second auxiliary cooling zone 820B is connected to the inlet of the second main cooling zone 810B. The first auxiliary cooling zone 820A, the first main cooling zone 810A, the second auxiliary cooling zone 820B, and the second main cooling zone 810B are connected in sequence. The outlet end of the second main cooling zone 810B serves as the liquid outlet 840 of the cooling plate 800. The outlet end of the second main cooling zone 810B can be connected to the inlet end of the liquid flow channel of the stator 110, or the outlet end of the second main cooling zone 810B is connected to the high-temperature liquid inlet 137 of the motor rear cover 130, or the outlet end of the second main cooling zone 810B is directly connected to the liquid inlet pipe 500 connected to the radiator 300.

[0189] At this point, the coolant enters the cooling plate 800 at the inlet of the first auxiliary cooling zone 820A, flows sequentially through the first auxiliary cooling zone 820A, the first main cooling zone 810A, the second auxiliary cooling zone 820B, and the second main cooling zone 810B, and ultimately exits the cooling plate 800 at the outlet of the second main cooling zone 810B. This simplifies the layout of the liquid cooling channels 114 within the cooling plate 800, facilitating the design and manufacture of the cooling plate 800. Furthermore, when the output power of the various components of the motor controller 700 is constant, the required coolant flow rate within the cooling plate 800 is relatively low.

[0190] It should be noted that the cooling liquid has the following flow directions on the cooling plate 800: Figure 7a As shown, in some scenarios, the flow direction of the coolant can also be Figure 7a . At this point, the second primary cooling zone 810B can be connected to the liquid inlet 830 of the cooling plate 800, and the first secondary cooling zone 820A can be connected to the liquid outlet 840 of the cooling plate 800. The coolant enters the cooling plate 800 from the inlet of the second primary cooling zone 810B, flows sequentially along the second primary cooling zone 810B, the second secondary cooling zone 820B, the first primary cooling zone 810A, and the first secondary cooling zone 820A, and finally flows out of the cooling plate 800 from the outlet of the first secondary cooling zone 820A.

[0191] As another embodiment, the liquid flow channels in the cooling plate 800 can also be connected in parallel (not shown in the figure). Still taking the inlet end of the first auxiliary cooling zone 820A as the liquid inlet of the cooling plate 800 as an example, the inlet end of the first auxiliary cooling zone 820A can be connected to the low-temperature liquid outlet 135 of the motor rear cover 130. The liquid outlet end of the first auxiliary cooling zone 820A can be divided into two branches, and the outlet ends of the two branches of the first auxiliary cooling zone 820A are respectively connected to the inlet end of the first main cooling zone 810A and the inlet end of the second main cooling zone 810B. The liquid inlet end of the second auxiliary cooling zone 820B can be divided into two branches, and the inlet ends of the two branches of the second auxiliary cooling zone 820B are respectively connected to the outlet end of the first main cooling zone 810A and the outlet end of the second main cooling zone 810B. The outlet end of the second auxiliary cooling zone 820B serves as the liquid outlet of the cooling plate 800. The outlet end of the second auxiliary cooling zone 820B can be connected to the inlet end of the stator 110, or the outlet end of the second auxiliary cooling zone 820B is connected to the high-temperature liquid inlet 137 of the motor rear cover 130, or the outlet end of the second auxiliary cooling zone 820B is directly connected to the liquid inlet pipe 500 connected to the radiator 300.

[0192] At this point, the coolant enters the cooling plate 800 from the inlet of the first auxiliary cooling zone 820A, flows along the first auxiliary cooling zone 820A, and enters the first and second main cooling zones 810A, 810B, respectively. After flowing out of the first and second main cooling zones 810A, the coolant merges in the second auxiliary cooling zone 820B, ultimately exiting the cooling plate 800 from the outlet of the second auxiliary cooling zone 820B. This ensures that the coolant flow rates in the first and second main cooling zones 810A, 810B are the same, providing essentially the same cooling conditions across all regions of the cooling plate 800 and providing a better cooling effect on the motor controller 700. Compared to a system where the liquid flow channels within the cooling plate 800 are connected in series, the cooling plate 800 requires a higher coolant flow rate when the output power of the various components of the motor controller 700 is constant. This results in a greater coolant force acting on the cooling plate 800, requiring increased sealing strength for the liquid flow channels, and requiring a higher-power drive motor 240.

[0193] Of course, when the liquid flow channels in the cooling plate 800 are connected in parallel, the second auxiliary cooling zone 820B can also be connected to the liquid inlet 830 of the cooling plate 800, while the first auxiliary cooling zone 820A can be connected to the liquid outlet 840 of the cooling plate 800. In this case, the coolant enters the cooling plate 800 from the inlet end of the second auxiliary cooling zone 820B, flows along the second auxiliary cooling zone 820B, and enters the first main cooling zone 810A and the second main cooling zone 810B respectively. After the coolant flows out of the first main cooling zone 810A and the second main cooling zone 810B, it merges in the first auxiliary cooling zone 820A and finally flows out of the cooling plate 800 from the outlet end of the first auxiliary cooling zone 820A. No further details will be given here.

[0194] In the cooling plate 800, the primary cooling zone 810 occupies the main portion of the cooling plate 800. The liquid flow channels within the primary cooling zone 810 are relatively large, and the liquid flow channels formed within the primary cooling zone 810 can be defined as cooling cavities. For example, the first primary cooling zone 810A has a first cooling cavity 811, and the second primary cooling zone 810B has a second cooling cavity 812. The secondary cooling zones 820 occupy the edges of the cooling plate 800. The liquid flow channels within the secondary cooling zones 820 are relatively small, and the liquid flow channels formed within the secondary cooling zones 820 can be defined as cooling tubes. For example, the first secondary cooling zone 820A has a first cooling tube 821, and the second secondary cooling zone 820B has a second cooling tube 822.

[0195] Figure 8 This is a schematic diagram of the planar structure of the stator 110 provided in an embodiment of the present application. Figure 9 A schematic diagram of the partial structure of the power motor 100 provided in an embodiment of the present application.

[0196] Combine Figure 8 and Figure 9 As shown, stator 110 may include a stator frame, a stator core assembly 119, and stator windings 112. The stator frame serves as the basic supporting component of stator 110 and may be annular. The stator frame may be configured as a hollow structure to facilitate assembly of stator 110 and rotor 120 and reduce the weight of stator 110. The stator core assembly 119 is fixedly connected to the stator frame, and the stator windings 112 are mounted on the stator core assembly 119.

[0197] The liquid flow channel arranged within the stator 110 can be referred to as a liquid cooling channel 114. The stator winding 112 is located within the liquid cooling channel 114 to dissipate heat from the stator winding 112. The liquid cooling channel 114 can include a flow-distributing channel 116 and a liquid cooling chamber 115. The outlet of the flow-distributing channel 116 is connected to the inlet of the liquid cooling chamber 115. As shown in the figure, the stator frame includes a stator bracket 111 and a bracket assembly 113. The bracket assembly 113 is sleeved around the outer periphery of the stator bracket 111 and fixedly connected to the stator bracket 111. The stator core assembly 119 is located outside the stator bracket 111 and between the bracket assembly 113 and the stator bracket 111. In this case, a flow-balancing channel 116 may be formed within the stator support 111. The support assembly 113 and the stator support 111 may enclose a liquid-cooling chamber 115. The stator windings 112 are located within the liquid-cooling chamber 115. The stator windings 112 are evenly distributed, for example, along the circumference of the liquid-cooling chamber 115. Coolant enters the stator support 111 from the inlet of the flow-balancing channel 116 and flows along the flow-balancing channel 116 formed within the stator support 111. The coolant flows into the liquid-cooling chamber 115 from the outlet of the flow-balancing channel 116 to cool the stator windings 112 within the liquid-cooling chamber 115.

[0198] It should be noted that, in addition to being enclosed by the bracket assembly 113 and the stator bracket 111, in some embodiments, the stator frame is the stator bracket 111. In this case, the liquid cooling chamber 115 and the flow equalizing channel 116 are both arranged on the stator bracket 111. The liquid cooling chamber 115 can be understood as a cavity formed by hollowing out the stator bracket 111.

[0199] By integrating the flow-balancing channel 116 into the stator frame, there is no need to add a separate liquid flow path. In this way, the heat dissipation structure design of the stator 110 is simpler, the overall volume of the stator 110 is smaller, and the weight of the stator 110 can be reduced, which is beneficial to the lightweighting of the power motor 100. In addition, the flow-balancing channel 116 can form a raised reinforcement structure on the stator frame, which can enhance the structural strength of the stator frame and improve the tensile strength, torque resistance, and overturning moment resistance of the power motor 100. In addition, the design of the flow-balancing channel 116 using the structure of the stator frame itself also facilitates the distribution and equalization of the coolant in the stator 110, which is beneficial to improving the cooling effect of the stator 110.

[0200] As previously described, when the cooling plate 800 and the stator 110 are connected in series, the inlet end of the flow-balancing channel 116 in the stator 110 can communicate with the outlet end of the liquid flow channel in the cooling plate 800, and the outlet end of the liquid cooling chamber 115 in the stator 110 can communicate with the liquid outlet channel 133 on the motor rear cover 130. At this point, the coolant flows through the liquid supply channel 132 in the motor rear cover 130, then flows from the low-temperature liquid outlet 135 on the motor rear cover 130 into the liquid flow channel of the cooling plate 800. After circulating within the cooling plate 800, it flows out of the outlet end of the cooling plate 800. It then enters the stator 110 through the inlet end of the flow-balancing channel 116 of the stator 110, enters the liquid cooling chamber 115 through the flow-balancing channel 116, and flows out of the stator 110 through the outlet end of the liquid cooling chamber 115. Afterwards, the liquid flows into the liquid outlet channel 133 in the motor rear cover 130 through the high-temperature liquid inlet 137 on the motor rear cover 130 , and then flows into the radiator 300 from the motor rear cover 130 , and the cycle continues.

[0201] Of course, the stator 110 can also be connected in parallel with the cooling plate 800. The inlet end of the flow equalization channel 116 in the stator 110 and the inlet end of the liquid flow channel in the cooling plate 800 are both connected to the liquid supply channel 132 in the motor back cover 130, and the outlet end of the liquid cooling cavity 115 in the stator 110 and the outlet end of the liquid flow channel in the cooling plate 800 are both connected to the liquid outlet channel 133 in the motor back cover 130. At this time, the coolant flows through the liquid supply channel 132 in the motor rear cover 130, flows out from the low-temperature liquid outlet 135 on the motor rear cover 130 and is divided into two paths, one path enters the cooling plate 800, and the other path enters the stator 110 through the inlet end of the flow-balancing channel 116. The coolant entering the stator 110 enters the liquid cooling chamber 115 through the flow-balancing channel 116, and then flows out of the stator 110 from the outlet end of the liquid cooling chamber 115. The coolant flowing out of the stator 110 merges with the coolant flowing out of the cooling plate 800, flows into the liquid outlet channel 133 in the motor rear cover 130 through the high-temperature liquid inlet 137 on the motor rear cover 130, and then flows into the radiator 300 from the motor rear cover 130, and the cycle continues.

[0202] Among them, the flow-balancing channel 116 arranged in the stator frame has multiple outlet ends, and the multiple outlet ends are arranged at intervals along the circumference of the power motor 100. For example, the outlet ends of the flow-balancing channel 116 can be evenly spaced along the circumference of the stator frame. Each outlet end of the flow-balancing channel 116 is connected to the interior of the liquid-cooling cavity 115. In this way, the coolant entering the flow-balancing channel 116 from the inlet end of the flow-balancing channel 116 can be distributed to the outlet ends of the flow-balancing channel 116 at a relatively uniform flow rate, so that the flow rate of the coolant flowing into the liquid-cooling cavity 115 from each outlet end of the flow-balancing channel 116 is within a preset range, or in other words, the flow rate of the coolant flowing into the liquid-cooling cavity 115 from each outlet end of the flow-balancing channel 116 is uniform.

[0203] With such an arrangement, the coolant in the equalizing flow channel 116 can be diverted from its multiple outlet ends and simultaneously flow into various areas in the circumferential direction of the liquid cooling chamber 115. In this way, the coolant can cool various areas in the circumferential direction of the liquid cooling chamber 115 at the same time, and the temperature of the coolant in various areas in the circumferential direction of the liquid cooling chamber 115 is basically consistent, which can improve the cooling uniformity of the coolant on each stator winding 112. In addition, the flow rate of the coolant flowing out of each outlet end of the equalizing flow channel 116 can also be basically consistent, so that the flow rate of the coolant allocated to each stator winding 112 is basically consistent, and the cooling efficiency of the coolant on each stator winding 112 is basically the same. As a result, the cooling uniformity of the coolant on the stator 110 is improved, and the cooling efficiency and cooling effect of the stator 110 are higher.

[0204] Specifically, such as Figure 8 As shown, the flow-distributing channel 116 disposed within the stator frame may include an annular channel 1161 and a plurality of diverter channels 1162. Each diverter channel 1162 surrounds the outer circumference of the annular channel 1161 and may be spaced apart along the circumference of the annular channel 1161. One end of each diverter channel 1162 communicates with the annular channel 1161, and this end may serve as the inlet end of the diverter channel 1162. The other end of each diverter channel 1162 communicates with a different circumferential portion of the liquid-cooling chamber 115, and this end may serve as the outlet end of the diverter channel 1162 (i.e., each outlet end of the aforementioned flow-distributing channel 116).

[0205] The annular flow channel 1161 is equivalent to the liquid inlet flow channel of the stator 110, and the inlet end of the stator 110 can be connected to the annular flow channel 1161. For example, a liquid inlet 1163 is provided on the annular flow channel 1161, and the liquid inlet 1163 can be located at any position on the circumference of the annular flow channel 1161. The liquid inlet 1163 of the annular flow channel 1161 can be connected to the outlet end of the cooling plate 800 (or the low-temperature liquid outlet 135 of the motor rear cover 130), and the coolant enters the stator 110 from the liquid inlet 1163 of the annular flow channel 1161. After the coolant enters the annular flow channel 1161 from the liquid inlet 1163, it flows along the annular flow channel 1161 and is divided into each branch flow channel 1162. The coolant in each branch flow channel 1162 then flows into the liquid cooling chamber 115.

[0206] Each of the diverter channels 1162 can extend radially along the annular channel 1161, and each of the diverter channels 1162 is evenly spaced along the circumference of the annular channel 1161. That is, along the circumference of the annular channel 1161, the angles between each two adjacent diverter channels 1162 are the same. In this way, the diverter channels 1162 are evenly spaced along the circumference of the annular channel 1161, and the flow rate of the coolant diverted from the annular channel 1161 to each of the diverter channels 1162 can be kept consistent. Furthermore, the coolant flowing out of each of the diverter channels 1162 is evenly distributed to various circumferential regions of the liquid-cooling chamber 115, thereby improving the uniformity of cooling of each stator winding 112.

[0207] For example, Figure 8 As shown in the figure, the flow-distributing channel 116 includes four diverter channels 1162. The four diverter channels 1162 extend radially along the annular channel 1161 and are evenly spaced along the circumference of the annular channel 1161. In this case, the four diverter channels 1162 are opposed to each other in pairs, and the two opposing diverter channels 1162 are located on the same radial line of the annular channel 1161. The four diverter channels 1162 are distributed in a "cross" shape.

[0208] Of course, in other examples, the flow-distributing channel 116 may also include five, six, seven, eight, or even more diverter channels 1162, each of which may extend radially along the annular channel 1161, and each of which may be evenly spaced along the circumference of the annular channel 1161. This embodiment is not limited thereto.

[0209] Combine Figure 8 and Figure 9 As shown, in some embodiments, the liquid flow channel arranged in the stator 110 may further include a winding flow channel 117, that is, the liquid cooling flow channel 114 may further include a winding flow channel 117, and the winding flow channel 117 surrounds the outer circumference of the annular flow channel 1161. For example, the overall structure of the winding flow channel 117 can be annular, and the center of the circle enclosed by the winding flow channel 117 can coincide with the center of the circle enclosed by the annular flow channel 1161, and the diameter of the circle enclosed by the winding flow channel 117 is larger than the diameter of the circle enclosed by the annular flow channel 1161. Each branch flow channel 1162 is connected between the annular flow channel 1161 and the winding flow channel 117, and the inlet end of the branch flow channel 1162 is connected to the annular flow channel 1161, and the outlet end of the branch flow channel 1162 is connected to the inlet end of the winding flow channel 117. When the center of the circle formed by the winding flow channel 117 coincides with the center of the circle formed by the annular flow channel 1161 , the extension direction of the diversion flow channel 1162 may also be the radial direction of the winding flow channel 117 .

[0210] At this time, multiple winding liquid inlets 118 can be arranged between the winding flow channel 117 and the liquid cooling chamber 115. The winding flow channel 117 and the liquid cooling chamber 115 are connected through the winding liquid inlets 118, and the connection between each winding liquid inlet 118 is between the outlet end of the winding flow channel 117 and the inlet end of the liquid cooling chamber 115. In this way, on the basis of evenly distributing the coolant to each area of ​​the liquid cooling chamber 115 through each branch flow channel 1162, each area of ​​the liquid cooling chamber 115 can be correspondingly provided with multiple winding liquid inlets 118, and the coolant in each part of the liquid cooling chamber 115 is further evenly distributed through the winding liquid inlets 118. As a result, the uniformity of the coolant flow in each part of the liquid cooling chamber 115 is further improved, and the liquid cooling consistency of each part of the liquid cooling chamber 115 is higher. The cooling uniformity of each stator winding 112 is better, the consistency of the stator winding 112 is high, and the working performance of the power motor 100 is further improved.

[0211] In some embodiments, the winding flow channel 117 and the winding liquid inlet 118 can be provided on the stator support 111. In other embodiments, the stator support 111 and the support assembly 113 can jointly form the winding flow channel 117 and the winding liquid inlet 118. In still other embodiments, the stator support 111, the stator core assembly 119, and the support assembly 113 can jointly form the winding flow channel 117 and the winding liquid inlet 118.

[0212] In other examples, the liquid flow channel disposed within the stator 110 may not include the winding flow channel 117, but may instead be directly connected to the inlet of the liquid cooling chamber 115 via the outlet of the diverter channel 1162. For example, if a large number of diverter channels 1162 are disposed within the flow-distributing channel 116, each diverter channel 1162 can form a plurality of evenly distributed inlet ports within the liquid cooling chamber 115, resulting in a high consistency in the flow rate and temperature of the coolant in each area of ​​the liquid cooling chamber 115. In this case, simply by connecting each diverter channel 1162 to the liquid cooling chamber 115, a highly consistent cooling effect can be ensured for each stator winding 112.

[0213] Taking the liquid flow channel arranged in the stator 110 including the winding flow channel 117 as an example, as an example, the winding flow channel 117 can be set as an integral annular flow channel, that is, the number of the winding flow channel 117 is one. In this case, each branch flow channel 1162 is connected to the corresponding position of the winding flow channel 117. As another example, the winding flow channel 117 can also be a segmented intermittent annular flow channel, that is, the number of the winding flow channels 117 can be multiple, and each winding flow channel 117 is arranged at intervals along the circumference of the power motor 100. In this case, each winding flow channel 117 should be connected to at least one branch flow channel 1162 so that the coolant can flow into each winding flow channel 117.

[0214] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric motor (21), characterized in that include: Power motor (100); Liquid outlet pipeline (600); Liquid inlet pipeline (500); A radiator (300) is provided, wherein the radiator (300) is used to dissipate heat for the power motor (100); the outlet end of the radiator (300) is in communication with the inlet end of the liquid outlet pipeline (600), and the inlet end of the radiator (300) is in communication with the outlet end of the liquid inlet pipeline (500); the radiator (300) is rigidly connected to the power motor (100) via at least one of the liquid outlet pipeline (600) and the liquid inlet pipeline (500), so as to fix the radiator (300) on the power motor (100) via the liquid outlet pipeline (600) and / or the liquid inlet pipeline (500).

2. The electric motor (21) according to claim 1, characterized in that The number of the liquid inlet pipeline (500) and the liquid outlet pipeline (600) is plural, and the liquid inlet pipeline (500) and the liquid outlet pipeline (600) are arranged at intervals in the circumferential direction of the power motor (100).

3. The electric motor (21) according to claim 2, characterized in that The number of the liquid inlet pipelines (500) and the liquid outlet pipelines (600) is the same, and the liquid inlet pipelines (500) and the liquid outlet pipelines (600) are alternately and spaced apart along the circumference of the power motor (100).

4. The electric motor (21) according to claim 1, characterized in that The power motor (100) comprises a stator (110) and a motor rear cover (130), wherein the motor rear cover (130) is connected to the stator (110), wherein: One end of the liquid inlet pipeline (500) is fixedly connected to the radiator (300), and the other end of the liquid inlet pipeline (500) is fixedly connected to the stator (110) or the motor rear cover (130); One end of the liquid outlet pipeline (600) is fixedly connected to the radiator (300), and the other end of the liquid outlet pipeline (600) is fixedly connected to the stator (110) or the motor rear cover (130).

5. The electric motor (21) according to claim 4, characterized in that The motor rear cover (130) is provided with a liquid inlet channel (131) and a liquid outlet channel (133); the inlet end of the liquid inlet channel (131) is communicated with the outlet end of the liquid outlet pipeline (600); and the outlet end of the liquid outlet channel (133) is communicated with the inlet end of the liquid inlet pipeline (500).

6. The electric motor (21) according to claim 5, characterized in that The stator (110) is provided with a liquid cooling channel (114). The electric engine (21) further comprises a motor controller (700) and a cooling plate (800). The cooling plate (800) is used to dissipate heat from the motor controller (700), wherein: The outlet end of the liquid inlet channel (131) is in communication with the inlet end of the cooling plate (800), the outlet end of the cooling plate (800) is in communication with the inlet end of the liquid cooling channel (114), and the outlet end of the liquid cooling channel (114) is in communication with the inlet end of the liquid outlet channel (133); or, The inlet end of the liquid cooling channel (114) and the inlet end of the cooling plate (800) are both connected to the outlet end of the liquid inlet channel (131), and the outlet end of the liquid cooling channel (114) and the outlet end of the cooling plate (800) are both connected to the inlet end of the liquid outlet channel (133).

7. The electric motor (21) according to claim 6, characterized in that The stator (110) comprises: A stator frame, wherein a liquid cooling cavity (115) and a flow balancing channel (116) are provided on the stator frame, the flow balancing channel (116) is connected to the liquid inlet channel (131), the liquid cooling cavity (115) is connected to the flow balancing channel (116) and the liquid outlet channel (133), and the liquid cooling cavity (115) and the flow balancing channel (116) form the liquid cooling channel (114); The stator winding (112) is located inside the liquid cooling cavity (115).

8. The electric motor (21) according to claim 7, characterized in that The flow balancing channel (116) includes: an annular flow channel (1161), the annular flow channel (1161) being in communication with the liquid inlet flow channel (131); A plurality of diversion channels (1162) are arranged at intervals along the circumference of the annular channel (1161), and the diversion channels (1162) connect the annular channel (1161) and the liquid cooling chamber (115).

9. The electric motor (21) according to claim 6, characterized in that The motor rear cover (130) is further provided with a liquid supply channel (132), and the electric engine (21) further comprises a liquid pump (200), wherein the liquid pump (200) is connected to the liquid inlet channel (131) and the liquid supply channel (132); The cooling plate (800) is connected to the liquid supply channel (132) and the liquid cooling channel (114), or the cooling plate (800) and the liquid cooling channel (114) are both connected to the outlet end of the liquid supply channel (132).

10. The electric motor (21) according to claim 9, characterized in that The motor rear cover (130) has a rear cover groove (138), and a portion of the liquid pump (200) is located inside the rear cover groove (138).

11. The electric motor (21) according to claim 10, characterized in that The bottom of the rear cover groove (138) has a first opening (1381) and a second opening (1382), wherein the first opening (1381) connects the liquid inlet channel (131) and the inlet end of the liquid pump (200), and the second opening (1382) connects the liquid supply channel (132) and the outlet end of the liquid pump (200).

12. The electric motor (21) according to claim 11, characterized in that The liquid pump (200) comprises a pump housing (210) and a pump rotor (220), wherein the pump housing (210) has a pump cavity (230), and the pump rotor (220) is disposed in the pump cavity (230); The pump housing (210) includes a pump cover (2111) and a pump body (2112), wherein the pump cover (2111) and the pump body (2112) enclose the pump chamber (230), and at least a portion of the pump body (2112) is located outside the rear cover groove (138) and is fixedly connected to the motor rear cover (130); an inlet joint portion (213) and an outlet joint portion (212) are provided on the pump cover (2111); the inlet joint portion (213) is inserted into the first opening (1381) to enable the pump chamber (230) to communicate with the liquid inlet channel (131); and the outlet joint portion (212) is inserted into the second opening (1382) to enable the pump chamber (230) to communicate with the liquid supply channel (132).

13. The electric motor (21) according to claim 12, characterized in that The electric engine (21) further comprises: a first sealing ring (150), the first sealing ring (150) being sleeved on the outer wall of the inlet joint portion (213) and respectively abutting against the pump cover (2111) and the bottom of the rear cover groove (138) along the axial direction of the power motor (100); and / or, The second sealing ring (160) is sleeved on the outer wall of the outlet joint portion (212) and abuts against the pump cover (2111) and the bottom of the rear cover groove (138) along the axial direction of the power motor (100).

14. The electric motor (21) according to claim 9, characterized in that The liquid pump (200) comprises a pump body (2112) and a pump rotor (220); the pump body (2112) and the motor rear cover (130) enclose a pump cavity (230); and the pump rotor (220) is disposed in the pump cavity (230).

15. The electric motor (21) according to claim 14, characterized in that The motor rear cover (130) has a rear cover groove (138), and the pump body (2112) and the rear cover groove (138) enclose the pump chamber (230).

16. The electric generator (21) according to any one of claims 9 to 15, characterized in that The electric engine (21) further comprises a fan (400), wherein the fan (400) is located between the radiator (300) and the power motor (100) along the axial direction of the power motor (100), and the fan (400) is used to dissipate heat from the radiator (300).

17. The electric motor (21) according to claim 16, characterized in that The liquid pump (200) comprises: A drive motor (240) is provided, wherein a first output end of the drive motor (240) is in transmission connection with the fan (400), and a second output end of the drive motor (240) is in transmission connection with a pump rotor (220) inside the liquid pump (200). The drive motor (240) serves as a pump motor of the liquid pump (200) and is used to drive the fan (400) to rotate.

18. The electric motor (21) according to claim 16, characterized in that The electric engine (21) further comprises a fan motor, wherein the fan motor is fixedly connected to the motor rear cover (130), the fan motor is transmission-connected to the fan (400), and the fan motor is used to drive the fan (400) to rotate.

19. An electric propulsion device (20), characterized in that The invention comprises a propeller (22) and an electric engine (21) according to any one of claims 1 to 18, wherein the propeller (22) is transmission-connected to a power motor (100) of the electric engine (21), and the power motor (100) is used to drive the propeller (22) to rotate.

20. An aircraft, characterized in that: The invention comprises a fuselage (11), wings (12), a tail wing (13) and an electric propulsion device (20) as claimed in claim 19, wherein the electric propulsion device (20) is arranged on the fuselage (11) and / or the wings (12) and / or the tail wing (13).

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