Power motor, electric engine, electric propulsion device and aircraft

Abstract

The embodiments of the present application provide a power motor, an electric engine, an electric propulsion device and an aircraft, and relate to the field of aircraft technology. The power motor includes a stator, and the stator includes a stator frame and a stator winding. A liquid cooling chamber and a flow balancing channel are provided on the stator frame, and the stator winding is arranged inside the liquid cooling chamber; the flow balancing channel has a plurality of outlet ends arranged at intervals along the circumference of the stator frame, and the plurality of outlet ends of the flow balancing channel are respectively connected to the liquid cooling chamber, and the flow balancing channel is used to make the flow of the coolant flowing into the liquid cooling chamber from each outlet end of the flow balancing channel uniform. In this way, the temperature of the power motor can be controlled within the allowable range to ensure the working performance of the power motor.

Description

Technical Field

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

[0002] The electric propulsion device is the direct power source of the electric vertical take-off and landing (eVTOL) aircraft. The electric propulsion device includes a propeller and an electric engine. The electric engine includes a power motor, which is connected to the propeller and is used to drive the propeller to rotate. Among them, the power motor is a high-power heat-generating motion device. If the temperature of the power motor cannot be controlled within a reasonable range, the output performance of the power motor will be reduced.

[0003] Currently, for high-power heat-generating moving devices, such as the drive motors of new energy vehicles, heat dissipation channels are usually arranged outside the stator of the drive motor. The coolant passing through the heat dissipation channels indirectly exchanges heat with the stator housing and stator winding of the stator, so as to keep the temperature of the drive motor within a reasonable range.

[0004] However, in order to meet the requirements of weight and layout space, electric vertical take-off and landing aircraft usually require the design of products to be small and precise, while ensuring the performance. If the heat dissipation flow channel in the related field is used to dissipate heat from the power motor, the electric engine will be larger in size and cannot meet the heat dissipation requirements of the power motor.

[0005] Therefore, how to achieve miniaturization of the power motor while dissipating the heat of the power motor has become a problem that needs to be solved urgently. Summary of the invention

[0006] The embodiments of the present application provide a power motor, an electric engine, an electric propulsion device and an aircraft, which can control the temperature of the power motor within an allowable range, ensure the working performance of the power motor and realize the miniaturized design of the power motor.

[0007] A first aspect of an embodiment of the present application provides a power motor, the power motor includes a stator, the stator includes a stator frame and a stator winding;

[0008] A liquid cooling cavity and a flow balancing channel are provided on the stator frame, and the stator winding is arranged inside the liquid cooling cavity; the flow balancing channel has a plurality of outlet ends arranged at intervals along the circumference of the stator frame, and the plurality of outlet ends of the flow balancing channel are respectively connected to the liquid cooling cavity, and the flow balancing channel is used to make the flow rate of the coolant flowing into the liquid cooling cavity from each outlet end of the flow balancing channel uniform.

[0009] The coolant in the flow-equalizing flow channel can be split from its multiple outlet ends and flow into each area on the circumference of the liquid cooling chamber at the same time. In this way, the coolant can cool each area on the circumference of the liquid cooling chamber at the same time, and the temperature of the coolant in each area on the circumference of the liquid cooling chamber is basically consistent, which can improve the cooling uniformity of the coolant on each stator winding. In addition, the flow rate of the coolant flowing out from each outlet end of the flow-equalizing flow channel can also be basically consistent, so that the flow rate of the coolant allocated to each stator winding is basically consistent, and the cooling efficiency of the coolant on each stator winding is basically the same. Thereby, the cooling uniformity of the coolant on the stator is improved, and the cooling efficiency of the stator is higher and the cooling effect is better. Therefore, the temperature of the power motor can be controlled within the allowable range to ensure the working performance of the power motor.

[0010] In addition, the stator frame is integrated with a flow-equalizing channel and a liquid cooling cavity, which can reduce the radial size of the stator, help reduce the volume and weight of the stator, so that the power motor is smaller in size and lighter in weight, thereby realizing a miniaturized design of the power motor.

[0011] In some possible implementations, the flow equalization channel includes:

[0012] Annular flow channel;

[0013] A plurality of branch flow channels are arranged at intervals along the circumference of the annular flow channel, an inlet end of the branch flow channel is communicated with the annular flow channel, and an outlet end of the branch flow channel is communicated with the liquid cooling chamber.

[0014] In some possible implementations, along the circumference of the annular flow channel, the angles between each two adjacent branch flow channels are the same.

[0015] In some possible implementations, the number of the branch flow channels is four.

[0016] In some possible implementations, the stator frame is further provided with:

[0017] The winding flow channel surrounds the outer side of the annular flow channel, and the two ends of the branch flow channel are respectively connected to the winding flow channel and the annular flow channel;

[0018] A plurality of winding liquid inlets are arranged at intervals along the circumference of the winding flow channel, and each of the winding liquid inlets is connected to the winding flow channel and the liquid cooling cavity.

[0019] In some possible implementations, the stator frame is further provided with:

[0020] Multiple winding flow channels are arranged in sequence along the circumferential direction of the annular flow channel at intervals, each winding flow channel is connected to the annular flow channel through at least one branch flow channel, and each winding flow channel is connected to the liquid cooling cavity through multiple winding liquid inlets.

[0021] In some possible implementations, the stator frame includes a stator bracket and a bracket assembly. The stator bracket is provided with a flow-equalizing channel. The bracket assembly is sleeved on the stator bracket and forms a liquid cooling chamber with the stator bracket.

[0022] A second aspect of the embodiment of the present application provides an electric engine, the electric engine comprising a liquid pump and a power motor as described in any one of the first aspects;

[0023] The power motor also includes a motor rear cover, which is fixedly connected to the stator, and is provided with a liquid inlet channel and a liquid supply channel, and the liquid supply channel is connected to the flow balancing channel;

[0024] The liquid pump is fixedly connected to the rear cover of the motor, and the liquid pump is connected to the liquid inlet flow channel and the liquid supply flow channel. The liquid pump is used to make the coolant circulate in sequence among the liquid inlet flow channel, the liquid supply flow channel, and the flow equalization flow channel.

[0025] In some possible implementations, 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.

[0026] In some possible implementations, 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.

[0027] In some possible implementations, the liquid pump includes a pump housing and a pump rotor, a pump cavity is disposed in the pump housing, and the pump rotor is disposed in the pump cavity;

[0028] The pump housing includes a pump cover and a pump body, and the pump body and the pump body form a pump cavity. 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 includes an outlet joint part and an inlet joint part, and the outlet joint part is inserted into the second opening to connect the pump cavity with the liquid supply channel; the inlet joint part is inserted into the first opening to connect the pump cavity with the liquid inlet channel.

[0029] In some possible implementations, the electric engine further comprises:

[0030] A first sealing ring, which is sleeved on the outer wall of the inlet joint portion and abuts against the bottom of the grooves of the pump cover and the rear cover respectively along the axial direction of the power motor; and / or,

[0031] The second sealing ring is sleeved on the outer wall of the outlet joint part and abuts against the bottom of the groove of the pump cover and the groove of the rear cover respectively along the axial direction of the power motor.

[0032] In some possible implementations, the liquid pump includes a pump body and a pump rotor. The pump body is fixedly connected to a rear cover of a motor. The pump body and the rear cover of the motor form a pump cavity. The pump rotor is disposed in the pump cavity.

[0033] In some possible implementations, the rear cover of the motor has a rear cover groove, and the pump body and the rear cover groove form a pump cavity.

[0034] In some possible implementations, the electric engine further includes a radiator, the radiator is fixedly connected to the rear cover of the motor, and the inlet end of the radiator is connected to the liquid inlet channel;

[0035] A liquid outlet channel is also provided on the rear cover of the motor, and the liquid outlet channel is connected with the liquid cooling cavity and the inlet end of the radiator.

[0036] In some possible implementations, the electric engine further includes a motor controller and a cooling plate for dissipating heat from the motor controller, the cooling plate having a liquid inlet and a liquid outlet, wherein:

[0037] The liquid inlet of the cooling plate is connected to the liquid supply channel, and the liquid outlet of the cooling plate is connected to the flow equalization channel; or,

[0038] The liquid outlet of the cooling plate and the outlet end of the liquid cooling cavity are both connected to the liquid outlet channel, and the liquid inlet of the cooling plate and the inlet end of the flow equalization channel are both connected to the liquid supply channel.

[0039] In some possible implementations, the cooling plate includes:

[0040] Main cooling zone;

[0041] The auxiliary cooling zone is connected to the peripheral side of the main cooling zone and communicated with the main cooling zone, so that the coolant flowing into the cooling plate through the liquid inlet flows through the main cooling zone and the auxiliary cooling zone and then flows out from the liquid outlet.

[0042] In some possible implementations, the number of the main cooling zone and the number of the auxiliary cooling zone are both two, the main cooling zone includes a first main cooling zone and a second main cooling zone, the first main cooling zone and the second main cooling zone are separated; the auxiliary cooling zone includes a first auxiliary cooling zone and a second auxiliary cooling zone, the first auxiliary cooling zone and the second auxiliary cooling zone are respectively arranged on both sides of the main cooling zone; wherein,

[0043] The first auxiliary cooling zone, the first main cooling zone, the second auxiliary cooling zone, and the second main cooling zone are connected in series in sequence, one of the first auxiliary cooling zone and the second main cooling zone is connected to the liquid inlet, and the other is connected to the liquid outlet; or

[0044] The first main cooling zone and the second main cooling zone are connected in parallel through the first auxiliary cooling zone and the second auxiliary cooling zone. One of the first auxiliary cooling zone and the second auxiliary cooling zone is connected to the liquid outlet, and the other is connected to the liquid outlet.

[0045] In some possible implementations, the first secondary cooling zone includes a first cooling pipe, the second secondary cooling zone includes a second cooling pipe, the first main cooling zone includes a first cooling cavity, and the second main cooling zone includes a second cooling cavity.

[0046] In some possible implementations, the motor controller includes a power module and a bus capacitor, and the power module includes a power motor power module and a drive motor power module;

[0047] The bus capacitor and the power motor power module are located in the main cooling zone, and the drive motor power module is located in the auxiliary cooling zone. The main cooling zone is used to dissipate heat for the power motor power module and the bus capacitor, and the auxiliary cooling zone is used to dissipate heat for the drive motor power module.

[0048] In some possible implementations, the electric engine further comprises:

[0049] A liquid outlet pipeline, the liquid outlet pipeline is connected to the liquid inlet channel and the outlet end of the radiator;

[0050] The liquid inlet pipeline is connected with the liquid outlet channel and the inlet end of the radiator.

[0051] In some possible implementations, the liquid outlet pipeline and the liquid inlet pipeline are both rigid pipes, and the radiator is rigidly connected to the rear cover of the motor through the liquid outlet pipeline and the liquid inlet pipeline.

[0052] In some possible implementations, the electric engine further includes: a fan, the fan is located between the radiator and the power motor along the axial direction of the power motor, and the fan is used to dissipate heat from the radiator.

[0053] In some possible implementations, the liquid pump includes: a drive motor, a first output end of the drive motor is transmission-connected to the fan, a second output end of the drive motor is transmission-connected to a pump rotor inside the liquid pump, and the drive motor serves as a pump motor of the liquid pump and is used to drive the fan to rotate.

[0054] In some possible implementations, 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 the fan motor is used to drive the fan to rotate.

[0055] A third 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, wherein 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.

[0056] A fourth 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 third aspect, wherein the electric propulsion device is arranged on the wings and / or the fuselage and / or the tail. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0058] Figure 1 A schematic diagram of the three-dimensional structure of an aircraft provided in an embodiment of the present application;

[0059] Figure 2 A schematic diagram of the architecture of an electric propulsion device provided in an embodiment of the present application;

[0060] 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;

[0061] Figure 4 A schematic diagram of the structure of an electric engine provided in an embodiment of the present application;

[0062] Figure 5 A schematic diagram of the structure of the motor rear cover provided in an embodiment of the present application;

[0063] Figure 6a for Figure 4 A schematic cross-sectional view of the electric engine shown;

[0064] Figure 6b A 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;

[0065] Figure 7a A schematic diagram of the structure of a cooling plate provided in an embodiment of the present application;

[0066] Figure 7b for Figure 7a A schematic diagram of the three-dimensional structure of the cooling plate and the motor controller shown;

[0067] Figure 8 A schematic diagram of the planar structure of a stator provided in an embodiment of the present application;

[0068] Fig. 9 A schematic diagram of the partial structure of the power motor provided in an embodiment of the present application.

[0069] Description of reference numerals:

[0070] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0071] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0072] 100. Power motor;

[0073] 110, stator; 111, stator bracket; 112, stator winding; 113, bracket assembly; 114, liquid cooling channel; 115, liquid cooling chamber; 116, uniform flow channel; 1161, annular flow channel; 1162, split flow channel; 1163, liquid inlet; 117, winding flow channel; 118, winding liquid inlet; 119, stator core assembly;

[0074] 120, rotor; 121, rotor housing; 122, magnetic steel;

[0075] 130, motor back 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, back cover groove; 1381, first opening; 1382, second opening; 139, mounting hole;

[0076] 140, containing cavity;

[0077] 150, first sealing ring;

[0078] 160, second sealing ring;

[0079] 170, third sealing ring;

[0080] 200, liquid pump;

[0081] 210, pump housing; 2111, pump cover; 211, main body; 212, outlet joint; 213, inlet joint; 2112, pump body;

[0082] 220, pump rotor;

[0083] 230, pump chamber;

[0084] 240, driving motor;

[0085] 300, radiator;

[0086] 400, fan;

[0087] 500, liquid inlet pipeline;

[0088] 600, liquid outlet pipeline;

[0089] 700, motor controller; 710, bus capacitor; 720, power motor power module; 730, drive motor power module; 740, drive board; 750, main control board;

[0090] 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;

[0091] 820, auxiliary cooling zone; 820A, first auxiliary cooling zone; 820B, second auxiliary cooling zone; 821, first cooling pipe; 822, second cooling pipe;

[0092] 830, liquid inlet; 840, liquid outlet.

[0093] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0094] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0095] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0096] In this application, unless otherwise clearly specified and limited, the terms "installation", "connection", "fixation" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, it can be a connection between two elements or an interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0097] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature 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. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0098] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means 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 the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0099] 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.

[0100] Figure 1 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 on the specific structure and shape of the aircraft.

[0101] like Figure 1 As 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 or mechanically connected to the fuselage 11 and is 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.

[0102] 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 .

[0103] 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 comprises eight electric propulsion devices 20 .

[0104] The electric propulsion device 20 is arranged on the fuselage 11 and / or the wing 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 device 20 is provided on the fuselage 11, and the wing 12 and the tail 13 are not provided with electric propulsion devices 20. In other scenarios, the electric propulsion device 20 is provided on the wing 12, and the fuselage 11 and the tail 13 are not provided with electric propulsion devices 20. In still other scenarios, the electric propulsion device 20 is provided on the tail 13, and the fuselage 11 and the wing 12 are not provided with electric propulsion devices 20.

[0105] 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 the 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 one of the arm 14 and the nacelle 15.

[0106] In some embodiments, 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 the nacelle 15 (not shown in the figure).

[0107] In some embodiments, Figure 1 As shown, the electric propulsion device 20 is disposed on the tail 13 through the nacelle 15. In other embodiments, the electric propulsion device 20 may also be disposed on the tail 13 through the machine arm 14 (not shown in the figure).

[0108] 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 wing 12 , and the tail 13 .

[0109] In some examples, the electric propulsion device 20 installed on the aircraft may include a tilting electric propulsion device 20b, and a tilting mechanism is arranged between the tilting electric propulsion device 20b and any one of the fuselage 11, the wing 12 and the tail 13, and the tilting mechanism is used to adjust the tilt angle of the tilting electric propulsion device 20b.

[0110] In some examples, all electric propulsion devices 20 provided on the aircraft are fixed electric propulsion devices 20a.

[0111] In other examples, all the electric propulsion devices 20 provided on the aircraft are tilting electric propulsion devices 20b.

[0112] 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.

[0113] In the embodiment of the present application, the electric propulsion device 20 is composed of a power battery (not shown in the figure), an electric engine 21, a propeller 22, etc. and their accessories. Among them, the electric engine 21 is a system composed of a power motor 100, a motor controller 700, cables, etc. and their accessories, which can convert electrical energy into mechanical energy. In actual implementation, the electric engine 21 can also be called an electric propulsion system.

[0114] Among them, Figure 1 As shown, the electric engine 21 is arranged on the machine arm 14 or the nacelle 15, the propeller 22 is arranged on one side of the electric engine 21, the electric engine 21 is transmission-connected with the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate.

[0115] Figure 2 This is a schematic diagram of the structure of an electric propulsion device provided in an embodiment of the present application. Figure 2 As shown, the electric engine 21 includes a power motor 100 and a motor controller 700, and the power motor 100 is drivingly connected to 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 work so that the power motor 100 drives the propeller 22 to rotate.

[0116] 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.

[0117] like Figure 2 As shown, the motor controller 700 can be disposed inside the stator 110 of the power motor 100 to facilitate fixing of the motor controller 700 and facilitate electrical connection between the motor controller 700 and the power motor 100 .

[0118] During operation, the power motor 100 continuously accumulates heat inside, 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 through the heat dissipation system to ensure that the electric motor 21 operates stably and reliably.

[0119] 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, and the cooling channel is communicated with the radiator 300, and the radiator 300 and the cooling channel together form a coolant circulation loop for the flow of 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 by transmission, and the fan motor can be installed in the housing of the power motor 100, and the fan motor drives the fan 400 to rotate to accelerate the air flow and blow the airflow to the radiator 300 to dissipate heat to the radiator 300.

[0120] The liquid pump 200 delivers low-temperature coolant into the cooling channel in the power motor 100. The low-temperature coolant flows along the cooling channel, absorbs the heat inside the power motor 100 (for example, the 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. The coolant after heat exchange is converted into low-temperature coolant again. The low-temperature coolant enters the cooling channel in the power motor 100 through the liquid pump 200 again to dissipate heat and cool the power motor 100. This cycle is repeated, and the heat generated inside the power motor 100 can be taken away in time, so that the temperature inside the power motor 100 is within an appropriate range, and the output power of the power motor 100 is guaranteed.

[0121] However, the existing heat dissipation system of the electric engine 21 is complex in design, the cooling pipe of the heat dissipation system is long, the weight of the coolant in the heat dissipation system is increased, and the heat dissipation system occupies a large space. This limits the lightness of the electric engine 21, making it difficult to arrange the electric engine 21 on the aircraft, and also affects the aerodynamic design of the aircraft. In addition, the heat dissipation system also has problems such as low heat dissipation efficiency and poor heat dissipation effect.

[0122] 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 by using a liquid pipeline.

[0123] The electric motor 21 according to the embodiment of the present application is described in detail below.

[0124] Figure 3 This is a schematic diagram of the operation 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, wherein 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.

[0125] 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 may be arranged on the side of the stator 110 away from the motor back cover 130, and the rotor 120 may, for example, be sleeved outside the stator 110.

[0126] 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 .

[0127] The electric engine 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 in 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.

[0128] 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, which may be fixedly connected to the housing of the power motor 100 (e.g., the motor rear cover 130), and the fan motor is in transmission connection with the fan 400. The fan motor is used to drive the fan 400 to rotate. At this time, the fan 400 is not in transmission connection with the drive motor 240 of the liquid pump 200.

[0129] The fan 400 rotates to speed up the flow of surrounding air, blows air to the radiator 300, and speeds up 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 to the radiator 300.

[0130] The power motor 100, the motor controller 700, the radiator 300, the liquid pump 200, the fan 400 and the liquid pipeline connected between the radiator 300 and the power motor 100 together constitute the heat dissipation system of the electric engine 21. The liquid pump 200 drives the coolant to circulate between the radiator 300 and the power motor 100 to dissipate heat and cool down the components in the power motor 100. The fan 400 blows air to the radiator 300 to quickly take away the heat in the radiator 300, cool down the coolant in the radiator 300, and enable the coolant to continuously cool the power motor 100.

[0131] In this embodiment, a cooling plate 800 is disposed in the accommodating cavity 140 of the power motor 100, and some components of the motor controller 700 can be attached to the surface of the cooling plate 800. A liquid flow channel is formed in the cooling plate 800, and the liquid flow channel in the cooling plate 800 is connected to the radiator 300, and the coolant can flow along the liquid flow channel in the cooling plate 800. The coolant in the cooling plate 800 performs heat exchange with the components attached to its surface to cool these components.

[0132] In addition, a liquid flow channel is formed in the stator 110 of the power motor 100, and the liquid flow channel in the stator 110 is used to cool the stator winding 112 provided in the stator 110. The stator winding 112 is maintained at a suitable ambient temperature to ensure the working stability and reliability of the power motor 100 and improve the working performance of the power motor 100.

[0133] On this basis, a liquid flow channel is also integrated on the motor rear cover 130 of the power motor 100, and 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 performs heat exchange with the components in the power motor 100 to cool the components in the power motor 100.

[0134] In this configuration, the radiator 300 is connected to the liquid flow channel in the cooling plate 800, the liquid flow channel in the stator 110, and the liquid flow channel on the motor rear cover 130. In this way, the coolant in the liquid pipeline can flow through the cooling plate 800, the stator 110, and the motor rear cover 130, which increases the flow rate of the coolant flowing through the power motor 100 and the flow area of ​​the coolant in the power motor 100, thereby improving the heat dissipation efficiency and heat dissipation effect of the power motor 100.

[0135] like Figure 3 As shown in the direction of the black arrow in , 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 for the total flow of 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.

[0136] 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 and flows through the cooling plate 800 and the stator 110 respectively, then merges and returns to the motor rear cover 130, and then flows back to the radiator 300 from 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 from the liquid pipeline, it is divided into two paths and flows through the motor rear cover 130 and the cooling plate 800 respectively, then merges and 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.

[0137] In this way, when the output power is the same, compared with the method in which the motor rear cover 130, the cooling plate 800 and the stator 110 are connected in series in sequence, when there are parallel liquid flow channels in the power motor 100, the coolant flows through the parallel liquid flow channels at the same time, and the cooling efficiency of the heat dissipation system for the power motor 100 is higher. At the same time, the heat dissipation system has a greater demand for the total flow rate of the coolant, and the heat dissipation cost is relatively high. The coolant exerts a greater pressure on the liquid flow channel, and the sealing strength requirement for the liquid flow channel is higher. The heat dissipation power requirement for the radiator 300 is also higher.

[0138] The following are Figure 3 The liquid flow channel of the motor rear cover 130, the liquid flow channel of the cooling plate 800 and the liquid flow channel of the stator 110 are connected in series in sequence, and 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.

[0139] Specifically, a liquid outlet pipeline 600 and a liquid inlet pipeline 500 are connected between the radiator 300 and the power motor 100, and the radiator 300 has an outlet end and an inlet end. The inlet end of the liquid outlet pipeline 600 is in communication with the outlet end of the radiator 300, and the outlet end of the liquid outlet pipeline 600 is in communication with the liquid flow path of the power motor 100. The inlet end of the liquid inlet pipeline 500 is in communication with the power motor 100, and the outlet end of the liquid inlet pipeline 500 is in communication with 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 pipeline 600, and after heat exchange with the components in the power motor 100, flows back into the radiator 300 from the liquid inlet pipeline 500 through the inlet end of the radiator 300.

[0140] When the liquid flow channel of the motor rear cover 130, the liquid flow channel of the cooling plate 800 and the liquid flow channel of the stator 110 are connected in series in sequence, the outlet end of the liquid outlet pipeline 600 is connected to the liquid flow channel on the motor rear cover 130, and the inlet end of the liquid inlet pipeline 500 is also connected to the liquid flow channel on the motor rear cover 130. At this time, the coolant in the radiator 300 flows into the motor rear cover 130 through the liquid outlet pipeline 600, and under the driving action of the liquid pump 200, the coolant flows from the motor rear cover 130 through the cooling plate 800 and the stator 110 in sequence, flows out of the stator 110 and then returns to the motor rear cover 130, and finally flows back into the radiator 300 through the liquid inlet pipeline 500.

[0141] Continue to refer to Figure 3As 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, and the power module and the bus capacitor 710 are integrated on the main control board 750. The motor controller 700 may also include a drive board 740, which is integrated on the main control board 750, the power module is arranged on the drive board 740, the main control board 750 controls the drive board 740, and the drive board 740 drives the power module.

[0142] 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 in the accommodating cavity 140 can be fully and reasonably utilized, and the volume of the power motor 100 can be reduced on the basis of fully cooling and dissipating the heat of the motor controller 700.

[0143] 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, the side walls of the two can be close to each other to reduce the occupied space of 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 the embodiment of the present application does not limit this.

[0144] 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 a motor. At this time, the output power of the drive motor 240 is controlled by the drive motor power module 730, and the fan 400 and the liquid pump 200 can be controlled to work at the same time. In some embodiments, the drive motor 240 can also be used only as a 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 are set on the same side.

[0145] In addition, the power module integrated on the motor controller 700 may also include a variable pitch motor power module, which is used to drive a variable pitch mechanism, and the variable pitch mechanism is used to control the pitch angle of the blades of the propeller 22. The variable pitch motor power module can be arranged on the same side as the power motor power module 720, or the variable pitch motor power module and the bus capacitor 710 are arranged on the same side.

[0146] Exemplarily, the number of bus capacitors 710 is two, the number of each power module can also be two, the bus capacitors 710 and each power module can be set one by one, and the devices on the motor controller 700 are divided into two groups. In this way, when the motor controller 700 is working, the two groups of devices can work at the same time. When one group of devices fails to work normally, the other group of devices still works normally. Alternatively, one group of devices in the two groups of devices is used as a common group and the other group of devices is used as a standby group. Normally, the common group works, and when the common group fails to work normally, it switches to the standby group to work.

[0147] In this way, by setting two groups of components, a redundant design is performed on the motor controller 700. The working mode of the motor controller 700 is more flexible and more reliable, and the working performance of the electric motor 21 can be improved.

[0148] 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, two bus capacitors 710 are arranged side by side on both sides of one side of the cooling plate 800, 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 two drive motor power modules 730 can be respectively arranged on the outside of the two power motor power modules 720.

[0149] 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.

[0150] Figure 4 This is a schematic diagram of the structure of the electric engine 21 provided in the embodiment of the present application. Figure 4As shown, the figure shows the liquid outlet pipeline 600 and the liquid inlet pipeline 500 connected between the radiator 300 and the power motor 100. Among them, the liquid outlet pipeline 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 pipeline 600. The liquid inlet pipeline 500 is connected between the inlet end of the radiator 300 and the motor rear cover 130, and the high-temperature coolant in the liquid flow channel of the motor rear cover 130 flows back to the radiator 300 through the liquid inlet pipeline 500.

[0151] 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.

[0152] Alternatively, when 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, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can both be used as main pipelines, and the liquid outlet pipeline 600 can be connected to the motor rear cover 130, the cooling plate 800 and the stator 110 respectively through each liquid outlet branch pipe, and the liquid inlet pipeline 500 can be connected to the motor rear cover 130, the cooling plate 800 and the stator 110 respectively through each liquid inlet branch pipe.

[0153] In this embodiment, at least one of the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can be used as a supporting structure. While connecting the radiator 300 and the liquid flow channel in the power motor 100, the radiator 300 can also be fixedly connected to the housing of the power motor 100 through at least one of the liquid outlet pipeline 600 and the liquid inlet pipeline 500. That is, the radiator 300 is rigidly connected to the housing of the power motor 100 through the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500. For example, the radiator 300 is fixedly connected to the motor rear cover 130 through the liquid outlet pipeline 600 and the liquid inlet pipeline 500, or the radiator 300 is fixedly connected to the stator 110 through the liquid outlet pipeline 600 and the liquid inlet pipeline 500. In this way, there is no need to set up other additional supporting structures or connecting structures to connect the radiator 300 and the power motor 100, which can simplify the structure of the electric engine 21 and reduce the manufacturing cost of the electric engine 21.

[0154] The liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 as the supporting structure can be made of metal material or hard plastic, and the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 are rigid pipelines, or in other words, the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 are rigid pipes. In this way, the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 have high structural strength and can meet the support requirements between the radiator 300 and the power motor 100. Exemplarily, both the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can be rigid pipelines.

[0155] Continue to refer to Figure 4 , the number of the liquid outlet pipelines 600 and the number of the liquid inlet pipelines 500 can both be at least two, and the number of the liquid outlet pipelines 600 and the number of the liquid inlet pipelines 500 can be the same, and the liquid outlet pipelines 600 and the liquid inlet pipelines 500 can be arranged at intervals along the circumference of the power motor 100. In this way, the number of the liquid outlet pipelines 600 and the liquid inlet pipelines 500 connected between the radiator 300 and the power motor 100 is large, and the flow rate of the coolant circulating between the radiator 300 and the power motor 100 can be large, which can improve 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, thereby ensuring that the radiator 300 is firmly and stably connected to the power motor 100.

[0156] Furthermore, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can be arranged alternately in the circumferential direction of the power motor 100. In this way, the design of the liquid flow channel on the motor rear cover 130 is facilitated, the extension length of the liquid flow channel on the motor rear cover 130 can be increased, and the distribution of the liquid flow channel on the motor rear cover 130 is more uniform. The temperature of the motor rear cover 130 can be made more balanced, and the cooling effect of the power motor 100 can be improved. In addition, the coolant in the liquid flow channel has a more uniform force on the motor rear cover 130, which can improve the stability and reliability of the motor rear cover 130.

[0157] In addition, if Figure 4As 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 in the figure), a hood and blades (not shown in the figure). 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 is used 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. Among them, 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 to the pump rotor 220 of the liquid pump 200 in a transmission manner.

[0158] 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, and the motor rear cover 130 is also provided with a low-temperature liquid inlet port 134 and a low-temperature liquid outlet port 135. The liquid outlet pipeline 600 connected to the radiator 300 is in communication with the low-temperature liquid inlet port 134 on the motor rear cover 130, and the low-temperature liquid inlet port 134 is in communication with the liquid inlet channel 131, and the outlet end of the liquid inlet channel 131 is in communication with the inlet end of the liquid pump 200. The outlet end of the liquid pump 200 is in communication with the inlet end of the liquid supply channel 132, and the low-temperature liquid outlet port 135 is in communication with the liquid supply channel 132, and the low-temperature liquid outlet port 135 can serve as the outlet end of the liquid supply channel 132, and the inlet end of the cooling plate 800 can be in communication with the low-temperature liquid outlet port 135.

[0159] 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 5 As shown in the direction of the black arrow in the liquid supply channel 132, the coolant flows out 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 flows out from 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 to cool the bus capacitor 710 and the power module and other heat-generating components. After that, the low-temperature coolant flows into the stator 110 to cool the stator winding 112 and other components.

[0160] It is understandable that the above description is a manner in which the liquid flow channel in the cooling plate 800 and the liquid flow channel in the stator 110 are connected in series in sequence. When the liquid flow channel in the cooling plate 800 and the liquid flow channel in 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, to cool the heat-generating components such as the bus capacitor 710, the power module, and the stator winding 112.

[0161] Continue to refer to Figure 5 As shown, the motor rear cover 130 is also integrated with a liquid outlet channel 133, and the motor rear cover 130 is also provided with a high-temperature liquid inlet 137 and a high-temperature liquid outlet 136. The high-temperature liquid inlet 137 can be connected to the outlet end of the stator 110, and the high-temperature liquid inlet 137 is connected to the liquid outlet channel 133, and the high-temperature liquid inlet 137 serves 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, and the high-temperature liquid outlet 136 serves as the outlet end of the liquid outlet channel 133. The liquid inlet pipeline 500 connected to the radiator 300 can be connected to the high-temperature liquid outlet 136.

[0162] After cooling the heat generating components such as the bus 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 direction of 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 pipeline 500, and the radiator 300 cools the high-temperature coolant into low-temperature coolant.

[0163] Similarly, the above description is also a way that the liquid flow channel in the cooling plate 800 and the liquid flow channel in the stator 110 are connected in series, and then the coolant flows back to the motor rear cover 130. When the liquid flow channel in the cooling plate 800 and the liquid flow channel in 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 be mixed and enter the liquid outlet channel 133 through the high-temperature liquid inlet 137.

[0164] Continue to refer to Figure 5 As shown, as an example, a liquid inlet channel 131 may be integrated on the motor rear cover 130, and the liquid inlet channel 131 may extend from the middle of the motor rear cover 130 to the opposite side edges of the motor rear cover 130. In this way, the extension length of the liquid inlet channel 131 is relatively large, and the radial area of ​​the motor rear cover 130 occupied by the liquid inlet channel 131 is relatively large, which has a better cooling effect on the motor rear cover 130.

[0165] On this basis, the liquid inlet channel 131 can be arranged close to 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 at the center of the motor rear cover 130, so as to facilitate the 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 shape, 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 of the liquid inlet channel 131 avoiding the liquid pump 200 located at the center of the motor rear cover 130.

[0166] At this time, the low-temperature liquid inlet 134 can be opened at both ends of the length direction of the liquid inlet channel 131, 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, the coolant is transported into the liquid inlet channel 131 from the low-temperature liquid inlets 134 at both ends at the same time, and the flow rate of the coolant in the liquid inlet channel 131 is large and the flow rate is fast, which can improve the cooling efficiency of the power motor 100 and enhance the 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 into 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.

[0167] A liquid supply channel 132 may also be integrated on the motor rear cover 130, and the liquid supply channel 132 may extend approximately in a straight line. One end of the liquid supply channel 132 may be arranged near the center of the motor rear cover 130, and the end of the liquid supply channel 132 is connected to the outlet end of the liquid pump 200 as its inlet end. The other end of the liquid supply channel 132 may be away from the center of the motor rear cover 130, and the end of the liquid supply channel 132 is connected to the cooling plate 800 as its outlet end.

[0168] Two liquid outlet channels 133 may be integrated on the motor back cover 130, and the two liquid outlet channels 133 may be respectively located on both sides 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 that flows 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 degree of the motor back cover 130.

[0169] Exemplarily, the liquid outlet channel 133 may include a first liquid outlet sub-channel 1331 and a second liquid outlet sub-channel 1332, wherein the first liquid outlet sub-channel 1331 may serve as a liquid outlet section of the liquid outlet channel 133, and the second liquid outlet sub-channel 1332 may serve as a 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, and both ends of the second liquid outlet sub-channel 1332 extend toward the two side edges of the motor rear cover 130. Furthermore, the first liquid outlet sub-channel 1331 can be connected to one 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.

[0170] 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 from the high-temperature liquid inlets 137 at both ends at the same time. 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.

[0171] As mentioned above, 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, and 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, and 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. Among them, 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 vertical. Correspondingly, two liquid outlet pipelines 600 and two liquid inlet pipelines 500 are connected between the radiator 300 and the power motor 100. The two liquid outlet pipelines 600 and the two liquid inlet pipelines 500 are arranged at approximately uniform intervals along the circumference of the power motor 100, and the liquid outlet pipelines 600 and the liquid inlet pipelines 500 are alternated in sequence.

[0172] Of course, under the premise that there is enough 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 less, and this embodiment does not impose any specific restrictions on this.

[0173] 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 body and the main board body together form a liquid inlet channel 131, a liquid supply channel 132 and a liquid outlet channel 133.

[0174] Since the liquid flow channel is integrated on 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 bonding the plates to the plates, which can simplify the sealing structure of the liquid flow channel and enhance the sealing performance of the liquid flow channel. In addition, it avoids laying additional liquid pipelines inside the power motor 100, 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.

[0175] Figure 6a for Figure 4 A schematic cross-sectional view of an electric motor is 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. Figure 5 , Figure 6a and Figure 6b As shown, the motor rear cover 130 is provided with a mounting hole 139, and the liquid pump 200 can be connected to the motor rear cover 130 through the mounting hole 139, so that the liquid pump 200 is integrated on the motor rear cover 130. In this way, the liquid pump 200 is directly fixed by the motor rear cover 130, and there is no need to set other structures in the power motor 100 to support and fix the liquid pump 200, which can reduce the number of components of the electric engine 21 and achieve lightweight electric engine 21. In addition, the liquid pump 200 is integrated on the motor rear cover 130, which can reduce the space occupied by the liquid pump 200 and reduce the overall volume of the electric engine 21.

[0176] 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, and the aforementioned drive motor 240 (or pump motor) is transmission-connected to the pump rotor 220. The drive motor 240 (or pump motor) drives the pump rotor 220 to rotate, so that the liquid pump 200 drives the coolant to flow in the liquid flow channel of the motor rear cover 130.

[0177] The liquid pump 200 integrated in the motor rear cover 130 has a pump chamber 230, the inlet end of the pump chamber 230 is connected to the outlet end of the liquid inlet channel 131 on the motor rear cover 130, and the outlet end of the pump chamber 230 is connected to the inlet end 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 to enter the liquid pump 200 from the inlet end of the pump chamber 230, and the coolant entering the liquid pump 200 then flows into the liquid supply channel 132 from the outlet end of the pump chamber 230.

[0178] Continue to refer to Figure 6a and Figure 6b In this embodiment, the motor rear cover 130 has a rear cover groove 138, and the rear cover groove 138 is arranged corresponding to the liquid pump 200. For example, the rear cover groove 138 is located in the central area of ​​the motor rear cover 130. The rear cover groove 138 is recessed toward the side of the motor rear cover 130 away from the stator 110 (or the side of the motor rear cover 130 facing the radiator 300), and part of the structure of the liquid pump 200 is located in the rear cover groove 138. In this way, the liquid pump 200 is integrated on the motor rear cover 130 in an embedded manner, and 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 rear cover 130. Thereby, 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.

[0179] Two hollow channels are formed inside the bottom of the rear cover groove 138, and the two hollow channels are separated from each other. For example, a recessed portion (not shown in the figure) is formed in the middle area of ​​the bottom of the rear cover groove 138, and the recessed portion is recessed from the outer wall of the motor rear cover 130 to the inner wall of the motor rear cover 130, and the recessed portion separates the two hollow channels formed in the bottom of the rear cover groove 138. Among them, one hollow channel is connected to the liquid inlet channel 131, or in other words, the hollow channel serves as a part of the liquid inlet channel 131. The other hollow channel is connected to the liquid supply channel 132, or in other words, the hollow channel serves as a part of the liquid supply channel 132.

[0180] And, refer to Figure 6a and Figure 6b As shown, the bottom of the groove of the rear cover groove 138 has a first opening 1381 and a second opening 1382 opened toward the inner wall surface of the motor rear cover 130. The first opening 1381 is connected to a hollow flow channel, and the first opening 1381 is connected to the liquid inlet flow channel 131 through the hollow flow channel. For example, the first opening 1381 serves as the outlet end of the liquid inlet flow channel 131. The second opening 1382 is connected to another hollow flow channel, and the second opening 1382 is connected to the liquid supply flow channel 132 through the hollow flow channel. For example, the second opening 1382 serves as the inlet end of the liquid supply flow channel 132. The first opening 1381 is connected to the inlet end of the pump chamber 230, and the second opening 1382 is connected to the outlet end of the pump chamber 230, so that the coolant in the liquid inlet flow channel 131 enters the liquid pump 200 through the first opening 1381, and the coolant in the liquid pump 200 enters the liquid supply flow channel 132 through the second opening 1382.

[0181] 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 surround the pump chamber 230. For example, except for the opening that needs to be connected to the motor rear cover 130, the pump housing 210 itself is formed into a relatively complete covering structure, covering 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 set against the bottom of the groove 138 of the rear cover. The inlet end on the pump cover 2111 is correspondingly connected to the first opening 1381 on the rear cover groove 138, and the outlet end on the pump cover 2111 can be correspondingly connected to the second opening 1382 on the rear cover groove 138.

[0182] As another embodiment, the liquid pump 200 and the motor rear cover 130 together form a pump cavity 230. Specifically, the pump body 2112 of the liquid pump 200 and the motor rear cover 130 form a pump cavity 230. For example, one 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, or the pump body 2112 extends into the rear cover groove 138, and the outer side wall of the pump body 2112 abuts against the inner side wall of the rear cover groove 138, or the end face of the pump body 2112 abuts against the groove 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 a portion of the inner wall surface outside the rear cover groove 138) together form a pump cavity 230. At this time, the first opening 1381 of the groove bottom of the rear cover groove 138 can be directly used as the inlet end of the pump cavity 230, and the second opening 1382 can be directly used as the outlet end of the pump cavity 230.

[0183] 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, and the pump cover 2111 covers the open end of the pump body 2112. In this way, the pump body 2112 and the pump cover 2111 together enclose a pump cavity 230 of the pump housing 210, which facilitates the installation of the pump rotor 220 into the pump housing 210.

[0184] Part of the pump body 2112 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 part of the outer wall of the pump body 2112 located in 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.

[0185] like Figure 6a and Figure 6b As shown, the pump cover 2111 includes a body 211, an inlet joint 213 and an outlet joint 212. The inlet joint 213 and the outlet joint 212 can be arranged on one side end surface of the body 211 facing the groove bottom of the rear cover groove 138. The inlet joint 213 is provided with an opening corresponding to the first opening 1381 on the groove bottom of the rear cover groove 138, and the opening on the inlet joint 213 serves as the inlet end of the pump chamber 230. The outlet joint 212 is provided with an opening corresponding to the second opening 1382 on the groove bottom of the rear cover groove 138, and the opening on the outlet joint 212 serves as the outlet end of the pump chamber 230.

[0186] 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.

[0187] Exemplarily, the outer contour of the inlet joint portion 213 may be smaller than the opening size of the first opening 1381, and the inlet joint portion 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 joint portion 212 may also be smaller than the opening size of the second opening 1382, and the outlet joint portion 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.

[0188] 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 .

[0189] In order to improve the sealing performance between the liquid pump 200 and the motor rear cover 130, a first sealing ring 150 may 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 body portion 211 and the bottom of the groove 138 of the rear cover to seal the connection between the inlet end of the pump chamber 230 and the first opening 1381. Similarly, a second sealing ring 160 may 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 body portion 211 and the bottom of the groove 138 of the rear cover to seal the connection between the outlet end of the pump chamber 230 and the second opening 1382.

[0190] In addition, the connection between the pump body 2112 and the pump cover 2111 can be sealed. A third sealing ring 170 can be abutted between the end surface of the pump body 2112 and the end surface of the pump cover 2111, and the gap between the pump body 2112 and the pump cover 2111 is sealed by the third sealing ring 170 to seal the pump cavity 230 formed in the pump housing 210.

[0191] Figure 7a 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 shown in the figure. Figure 7a As shown, in this embodiment, the cooling plate 800 used to cool 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, is convenient for the assembly and disassembly of the power motor 100 as a whole, and is also convenient for the piping design of the heat dissipation system. The production efficiency of the electric engine 21 can be improved, and the production cost of the electric engine 21 can be reduced.

[0192] The cooling plate 800 may 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 .

[0193] 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, and of course, the auxiliary cooling zone 820 may also be in other shapes, such as a wave shape, etc. Therefore, the shapes of the main cooling zone 810 and the auxiliary cooling zone 820 are not specifically limited here.

[0194] 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 the coolant to enter the interior of the cooling plate 800, and the liquid outlet 840 is used to allow the coolant inside the cooling plate 800 to flow out. The liquid inlet 830 can be set in the auxiliary cooling zone 820 or the main cooling zone 810, and the liquid outlet 840 can be set 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 from the liquid outlet 840 of the cooling plate 800.

[0195] There is no limitation on the number of primary cooling zones 810 and secondary cooling zones 820. Figure 7a As shown, there are two main cooling zones 810 and two auxiliary cooling zones 820. For ease of description, in this embodiment, the two main cooling zones 810 are respectively defined as a first main cooling zone 810A and a second main cooling zone 810B, and the two auxiliary cooling zones 820 are respectively defined as a first auxiliary cooling zone 820A and a second auxiliary cooling zone 820B.

[0196] Specifically, the first main cooling zone 810A and the second main cooling zone 810B may 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 may 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 length direction of the cooling plate 800, the second main cooling zone 810B is located on the lower side of the length direction of the cooling plate 800, the first auxiliary cooling zone 820A is located on the left side of the width direction of the cooling plate 800, and the second auxiliary cooling zone 820B is located on the right side of the width direction of the cooling plate 800.

[0197] 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 arranged corresponding 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.

[0198] On this basis, a side plate surface of the cooling plate 800 used to fit the power motor power module 720 can be formed with a storage groove (not shown in the figure), and at least part of the thickness of the power motor power module 720 is located in the storage groove. For example, the two main cooling zones 810 each have a storage groove, and the two power motor power modules 720 are respectively arranged in the two storage 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.

[0199] 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 arranged corresponding to 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.

[0200] Figure 7b , the case where the surface area of ​​the bus capacitor 710 is large is shown, and the edges of the two bus capacitors 710 extend beyond the two ends of the length direction of the cooling plate 800. In other words, the bus capacitor 710 can completely cover the main cooling zone 810, and the bus capacitor 710 extends beyond the main cooling zone 810. At this time, the surface of one side of the cooling plate 800 used to fit the bus capacitor 710 can be an integral planar structure, so that the bus capacitor 710 extending outside the cooling plate 800 can be as much as possible. Attached to the surface of the cooling plate 800, increase the contact area between the bus capacitor 710 and the cooling plate 800.

[0201] 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 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 storage grooves, and the two bus capacitors 710 are respectively arranged in the two storage grooves. It will not be repeated here.

[0202] 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. 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 for the drive motor power module 730.

[0203] 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 two auxiliary cooling zones 820. The drive motor power module 730 is usually small in size and generates less heat. The area of ​​the auxiliary cooling zone 820 is sufficient to cool the drive motor power module 730 and make the internal layout structure of the power motor 100 more compact.

[0204] In addition, a first heat-conducting layer (not shown in the figure) may be provided between the drive motor power module 730 and the cooling plate 800, and the heat of the drive motor power module 730 is quickly transferred to the cooling plate 800 through the first heat-conducting layer. In particular, when the drive motor power module 730 is attached to the auxiliary cooling zone 820, the surface flatness of the auxiliary cooling zone 820 is relatively not very high due to the shape and structure of the auxiliary cooling zone 820. The first heat-conducting layer can compensate for surface defects such as pits and protrusions of the auxiliary cooling zone 820, so that the drive motor power module 730 is closely attached to the auxiliary cooling zone 820, and the heat dissipation effect of the cooling plate 800 on the drive motor power module 730 is improved.

[0205] Similarly, a heat conducting layer may be provided between other components of the motor controller 700 and the cooling plate 800. For example, a second heat conducting layer is provided between the bus capacitor 710 and the cooling plate 800, and a third heat conducting layer is provided between the power motor power module 720 and the cooling plate 800. This will not be described in detail here.

[0206] like Figure 7aAs shown in the direction of the black arrow in , as an implementation method, the liquid flow channels in the cooling plate 800 are connected in series in sequence. Taking the inlet end of the first auxiliary cooling zone 820A as the liquid inlet 830 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 outlet end of the first auxiliary cooling zone 820A is connected to the inlet end of the first main cooling zone 810A, the outlet end of the first main cooling zone 810A is connected to the inlet end of the second auxiliary cooling zone 820B, the outlet end of the second auxiliary cooling zone 820B is connected to the inlet end of the second main cooling zone 810B, and 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 pipeline 500 connected to the radiator 300.

[0207] At this time, the coolant enters the cooling plate 800 from the inlet end of the first auxiliary cooling zone 820A, flows in sequence along 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 finally flows out of the cooling plate 800 from the outlet end of the second main cooling zone 810B. In this way, the layout of the liquid cooling channel 114 in the cooling plate 800 is simpler, which is convenient for the design and manufacture of the cooling plate 800. In addition, when the output power of each component of the motor controller 700 is constant, the flow rate of the coolant required in the cooling plate 800 is small.

[0208] It should be noted that the coolant has a flow direction on the cooling plate 800 other than Figure 7a As shown, in some scenarios, the flow direction of the coolant can also be Figure 7a At this time, the second main cooling zone 810B can be connected to the liquid inlet 830 of the cooling plate 800, and the first auxiliary 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 end of the second main cooling zone 810B, flows along the second main cooling zone 810B, the second auxiliary cooling zone 820B, the first main cooling zone 810A and the first auxiliary cooling zone 820A in sequence, and finally flows out of the cooling plate 800 from the outlet end of the first auxiliary cooling zone 820A.

[0209] 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 sub-cooling zone 820B serves as the liquid outlet of the cooling plate 800. The outlet end of the second sub-cooling zone 820B can be connected to the inlet end of the stator 110, or the outlet end of the second sub-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 sub-cooling zone 820B is directly connected to the liquid inlet pipeline 500 connected to the radiator 300.

[0210] At this time, the coolant enters the cooling plate 800 from the inlet end of the first auxiliary cooling zone 820A, flows along the first auxiliary cooling zone 820A, and enters the first main cooling zone 810A and the second main cooling zone 810B respectively. After the coolant flows out from the first main cooling zone 810A and the second main cooling zone 810B, it merges in the second auxiliary cooling zone 820B, and finally flows out of the cooling plate 800 from the outlet end of the second auxiliary cooling zone 820B. In this way, the flow rate of the coolant in the first main cooling zone 810A and the second main cooling zone 810B is the same, the cooling conditions of each area of ​​the cooling plate 800 are basically the same, and the cooling effect on the motor controller 700 is better. Compared with the method in which the liquid flow channels in the cooling plate 800 are connected in series in sequence, when the output power of each component of the motor controller 700 is constant, the cooling plate 800 has a higher demand for the flow rate of the coolant, the coolant has a greater force on the cooling plate 800, the sealing strength of the liquid flow channel needs to be increased, and a higher power drive motor 240 needs to be configured.

[0211] 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. At this time, 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.

[0212] Among them, in the cooling plate 800, the main cooling zone 810 occupies the main part of the cooling plate 800, the space of the liquid flow channel in the main cooling zone 810 is relatively large, and the liquid flow channel formed in the main cooling zone 810 can be defined as a cooling cavity. For example, the first main cooling zone 810A has a first cooling cavity 811, and the second main cooling zone 810B has a second cooling cavity 812. The auxiliary cooling zone 820 occupies the edge of the cooling plate 800, the space of the liquid flow channel in the auxiliary cooling zone 820 is relatively small, and the liquid flow channel formed in the auxiliary cooling zone 820 can be defined as a cooling pipe. For example, the first auxiliary cooling zone 820A has a first cooling pipe 821, and the second auxiliary cooling zone 820B has a second cooling pipe 822.

[0213] Figure 8 This is a schematic diagram of the planar structure of the stator 110 provided in an embodiment of the present application. Fig. 9 A schematic diagram of the partial structure of the power motor 100 provided in an embodiment of the present application.

[0214] Combination Figure 8 and Fig. 9 As shown, the stator 110 may include a stator frame, a stator core assembly 119 and a stator winding 112. The stator frame is a basic supporting component of the stator 110 as a whole, and the stator frame may be annular. The stator frame may be set as a hollow structure to facilitate the assembly of the stator 110 and the rotor 120, and also to reduce the weight of the stator 110. The stator core assembly 119 is fixedly connected to the stator frame, and the stator winding 112 is installed on the stator core assembly 119.

[0215] The liquid flow channel arranged in the stator 110 can be called a liquid cooling channel 114, and the stator winding 112 is located inside the liquid cooling channel 114 to dissipate heat for the stator winding 112. The liquid cooling channel 114 may include a flow-equalizing channel 116 and a liquid cooling chamber 115, and the outlet end of the flow-equalizing channel 116 is connected to the inlet end of the liquid cooling chamber 115. The stator frame includes a stator bracket 111 and a bracket assembly 113, the bracket assembly 113 is sleeved on the outer periphery of the stator bracket 111 and fixedly connected to the stator bracket 111, and the stator core assembly 119 is located outside the stator bracket 111 and between the bracket assembly 113 and the stator bracket 111. At this time, the flow-equalizing channel 116 may be formed in the stator support 111, the support assembly 113 and the stator support 111 may enclose a liquid cooling chamber 115, the stator winding 112 is located inside the liquid cooling chamber 115, and the stator winding 112 is, for example, evenly arranged along the circumference of the liquid cooling chamber 115. The coolant enters the stator support 111 from the inlet end of the flow-equalizing channel 116, and flows along the flow-equalizing channel 116 formed in the stator support 111, and the coolant flows into the liquid cooling chamber 115 from the outlet end of the flow-equalizing channel 116 to cool the stator winding 112 in the liquid cooling chamber 115.

[0216] It should be noted that, in addition to being surrounded 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, and the liquid cooling chamber 115 can be understood as a cavity formed by hollowing out the stator bracket 111.

[0217] 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 lightweight 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 resistance, 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.

[0218] As mentioned above, when the cooling plate 800 and the stator 110 are connected in series, the inlet end of the flow-equalizing channel 116 in the stator 110 can be connected to 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 be connected to the liquid outlet channel 133 on the motor rear cover 130. At this time, after the coolant flows through the liquid supply channel 132 in the motor rear cover 130, it flows into the liquid flow channel of the cooling plate 800 from the low-temperature liquid outlet 135 on the motor rear cover 130, circulates in the cooling plate 800, and flows out from the outlet end of the cooling plate 800. Then, it enters the stator 110 from the inlet end of the flow-equalizing channel 116 of the stator 110, enters the liquid cooling chamber 115 from the flow-equalizing channel 116, and flows out of the stator 110 from 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.

[0219] 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 channel in the cooling plate 800 are both connected to the liquid supply channel 132 in the motor rear cover 130, and the outlet end of the liquid cooling cavity 115 in the stator 110 and the outlet end of the liquid channel in the cooling plate 800 are both connected to the liquid outlet channel 133 in the motor rear cover 130. At this time, after the coolant flows through the liquid supply channel 132 in the motor rear cover 130, it 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 from the inlet end of the flow-equalizing channel 116. The coolant entering the stator 110 enters the liquid cooling chamber 115 through the flow-equalizing 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.

[0220] Among them, the flow-equalizing channel 116 arranged in the stator frame has a plurality of outlet ends, and the plurality of outlet ends are arranged at intervals along the circumference of the power motor 100. For example, the outlet ends of the flow-equalizing channel 116 can be arranged at even intervals along the circumference of the stator frame. The outlet ends of the flow-equalizing channel 116 are all connected to the interior of the liquid-cooling cavity 115. In this way, the coolant entering the flow-equalizing channel 116 from the inlet end of the flow-equalizing channel 116 can be distributed to the outlet ends of the flow-equalizing channel 116 at a relatively uniform flow rate, so that the flow rate of the coolant flowing into the liquid-cooling cavity 115 from the outlet ends of the flow-equalizing 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 the outlet ends of the flow-equalizing channel 116 is uniform.

[0221] With such a configuration, the coolant in the flow-equalizing channel 116 can be split from its multiple outlet ends and flow into each area in the circumferential direction of the liquid-cooling chamber 115 at the same time. In this way, the coolant can cool each area in the circumferential direction of the liquid-cooling chamber 115 at the same time, and the temperature of the coolant in each area 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 flow-equalizing 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. Thereby, 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.

[0222] Specifically, Figure 8 As shown, the flow-balancing channel 116 disposed in the stator frame may include an annular channel 1161 and a plurality of flow-dividing channels 1162. Each flow-dividing channel 1162 surrounds the outer circumference of the annular channel 1161, and each flow-dividing channel 1162 may be arranged at intervals along the circumference of the annular channel 1161. One end of each flow-dividing channel 1162 is connected to the annular channel 1161, and this end may serve as the inlet end of the flow-dividing channel 1162. The other end of each flow-dividing channel 1162 is respectively connected to different parts of the circumference of the liquid-cooling chamber 115, and this end may serve as the outlet end of the flow-dividing channel 1162 (i.e., each outlet end of the aforementioned flow-balancing channel 116).

[0223] 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 flows into each branch flow channel 1162 in a branch flow channel 1162. The coolant in each branch flow channel 1162 flows into the liquid cooling chamber 115.

[0224] Among them, each branch flow channel 1162 can extend along the radial direction of the annular flow channel 1161, and each branch flow channel 1162 is evenly spaced along the circumference of the annular flow channel 1161. That is to say, along the circumference of the annular flow channel 1161, the angle between each adjacent two branch flow channels 1162 is the same. In this way, the branch flow channels 1162 are evenly spaced in the circumference of the annular flow channel 1161, and the flow rate of the coolant diverted from the annular flow channel 1161 to each branch flow channel 1162 can be kept consistent. In addition, the coolant flowing out of each branch flow channel 1162 is evenly distributed to each area on the circumference of the liquid cooling chamber 115 to improve the cooling uniformity of each stator winding 112.

[0225] For example, Figure 8 As shown in the figure, the flow-averaging channel 116 includes four flow-dividing channels 1162, and the four flow-dividing channels 1162 all extend along the radial direction of the annular channel 1161, and the four flow-dividing channels 1162 are evenly spaced along the circumference of the annular channel 1161. At this time, among the four flow-dividing channels 1162, the flow-dividing channels 1162 are opposite to each other, and the two opposite flow-dividing channels 1162 are located on the same radial line of the annular channel 1161, and the four flow-dividing channels 1162 are distributed in a "cross" shape.

[0226] Of course, in other examples, the flow-averaging channel 116 may also include five, six, seven, eight or even more flow-dividing 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 to this.

[0227] Combination Figure 8 and Fig. 9 As shown, in some embodiments, the liquid flow channel arranged in the stator 110 may also include a winding flow channel 117, that is, the liquid cooling flow channel 114 may also include a winding flow channel 117, and the winding flow channel 117 surrounds the outer periphery of the annular flow channel 1161. For example, the overall structure of the winding flow channel 117 may be annular, the center of the circle surrounded by the winding flow channel 117 may coincide with the center of the circle surrounded by the annular flow channel 1161, and the diameter of the circle surrounded by the winding flow channel 117 is greater than the diameter of the circle surrounded 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, 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 branch flow channel 1162 may also be the radial direction of the winding flow channel 117 .

[0228] At this time, a plurality of winding liquid inlets 118 may be arranged between the winding flow channel 117 and the liquid cooling chamber 115, and the winding flow channel 117 and the liquid cooling chamber 115 are connected through the winding liquid inlets 118, and the connection of 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 may be correspondingly provided with a plurality of 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. Thereby, 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.

[0229] In some embodiments, the winding flow channel 117 and the winding liquid inlet 118 may be disposed on the stator support 111. In other embodiments, the stator support 111 and the support assembly 113 may 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 may jointly form the winding flow channel 117 and the winding liquid inlet 118.

[0230] In other examples, the liquid flow channel arranged in the stator 110 may not include the winding flow channel 117, but directly connects to the inlet end of the liquid cooling chamber 115 through the outlet end of the shunt flow channel 1162. For example, the number of shunt flow channels 1162 arranged in the uniform flow channel 116 is relatively large, and each shunt flow channel 1162 can form a plurality of evenly distributed inlet ends in the liquid cooling chamber 115, and the flow rate and temperature of the coolant in each area of ​​the liquid cooling chamber 115 are highly consistent. At this time, only by connecting each shunt flow channel 1162 with the liquid cooling chamber 115 can it be ensured that each stator winding 112 has a highly consistent cooling effect.

[0231] Taking the example that the liquid flow channel arranged in the stator 110 includes the winding flow channel 117, 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. At this time, 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. At this time, 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.

[0232] 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 it. 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 replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A power motor, characterized in that: The stator (110) comprises a stator frame and a stator winding (112); The stator frame is provided with a liquid cooling cavity (115) and a flow balancing channel (116); the stator winding (112) is arranged inside the liquid cooling cavity (115); the flow balancing channel (116) has a plurality of outlet ends arranged at intervals along the circumference of the stator frame; the plurality of outlet ends of the flow balancing channel (116) are respectively connected to the liquid cooling cavity (115); the flow balancing channel (116) is used to make the flow rate of the cooling liquid flowing from each outlet end of the flow balancing channel (116) into the liquid cooling cavity (115) uniform; Wherein, the flow equalizing channel (116) comprises: Annular flow channel (1161); A plurality of branch flow channels (1162), wherein the plurality of branch flow channels (1162) are arranged at intervals along the circumference of the annular flow channel (1161), an inlet end of the branch flow channel (1162) is connected to the annular flow channel (1161), and an outlet end of the branch flow channel (1162) is connected to the liquid cooling chamber (115).

2. The power motor according to claim 1, characterized in that: Along the circumference of the annular flow channel (1161), the angles between each two adjacent flow branching flow channels (1162) are the same.

3. The power motor according to claim 2, characterized in that: The number of the branch flow channels (1162) is four.

4. The power motor according to claim 1, characterized in that: The stator frame is also provided with: A winding flow channel (117), the winding flow channel (117) surrounding the outside of the annular flow channel (1161), and two ends of the flow-dividing flow channel (1162) respectively connecting the winding flow channel (117) and the annular flow channel (1161); A plurality of winding liquid inlets (118), wherein the plurality of winding liquid inlets (118) are arranged at intervals along the circumference of the winding flow channel (117), and each of the plurality of winding liquid inlets (118) is connected to the winding flow channel (117) and the liquid cooling cavity (115).

5. The power motor according to claim 1, characterized in that: The stator frame is also provided with: A plurality of winding flow channels (117), wherein the plurality of winding flow channels (117) are sequentially arranged at intervals along the circumference of the annular flow channel (1161), each of the winding flow channels (117) is connected to the annular flow channel (1161) via at least one of the branch flow channels (1162), and each of the winding flow channels (117) is connected to the liquid cooling chamber (115) via a plurality of winding liquid inlets (118).

6. The power motor according to any one of claims 1 to 5, characterized in that: The stator frame comprises a stator support (111) and a support assembly (113); the stator support (111) is provided with the flow balancing channel (116); the support assembly (113) is sleeved on the stator support (111) and forms the liquid cooling cavity (115) together with the stator support (111).

7. An electric motor, characterized in that: It comprises a liquid pump (200) and a power motor (100) as claimed in any one of claims 1 to 6; The power motor (100) further comprises a motor rear cover (130), the motor rear cover (130) being fixedly connected to the stator (110), the motor rear cover (130) being provided with a liquid inlet channel (131) and a liquid supply channel (132), the liquid supply channel (132) being in communication with the flow balancing channel (116); The liquid pump (200) is fixedly connected to the motor rear cover (130), the liquid pump (200) is connected to the liquid inlet channel (131) and the liquid supply channel (132), and the liquid pump (200) is used to allow the coolant to circulate in sequence between the liquid inlet channel (131), the liquid supply channel (132), and the flow balancing channel (116).

8. The electric motor according to claim 7, 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).

9. The electric motor according to claim 8, 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).

10. The electric motor according to claim 9, characterized in that The liquid pump (200) comprises a pump housing (210) and a pump rotor (220); a pump chamber (230) is provided in the pump housing (210); and the pump rotor (220) is disposed in the pump chamber (230); The pump housing (210) comprises a pump cover (2111) and a pump body (2112), wherein the pump body (2112) 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); the pump cover (2111) comprises an outlet joint portion (212) and an inlet joint portion (213), wherein the outlet joint portion (212) is inserted into the second opening (1382) so that the pump chamber (230) is in communication with the liquid supply channel (132); and the inlet joint portion (213) is inserted into the first opening (1381) so that the pump chamber (230) is in communication with the liquid inlet channel (131).

11. The electric motor according to claim 7, characterized in that The electric engine (21) further comprises a radiator (300), the radiator (300) being fixedly connected to the motor rear cover (130), and the inlet end of the radiator (300) being in communication with the liquid inlet channel (131); The motor rear cover (130) is also provided with a liquid outlet channel (133), and the liquid outlet channel (133) is connected to the liquid cooling cavity (115) and the inlet end of the radiator (300).

12. The electric motor according to claim 11, characterized in that The electric engine (21) further comprises a motor controller (700) and a cooling plate (800) for dissipating heat from the motor controller (700), wherein the cooling plate (800) has a liquid inlet (830) and a liquid outlet (840), wherein: The liquid inlet (830) of the cooling plate (800) is connected to the liquid supply channel (132), and the liquid outlet (840) of the cooling plate (800) is connected to the flow equalization channel (116); or, The liquid outlet (840) of the cooling plate (800) and the outlet end of the liquid cooling chamber (115) are both in communication with the liquid outlet channel (133), and the liquid inlet (830) of the cooling plate (800) and the inlet end of the flow equalization channel (116) are both in communication with the liquid supply channel (132).

13. An electric propulsion device, characterized in that: It comprises a propeller (22) and an electric engine (21) as claimed in any one of claims 7 to 12, wherein the propeller (22) is drivingly 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.

14. 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 13, wherein the electric propulsion device (20) is arranged on the wings (12) and / or the fuselage (11) and / or the tail wing (13).

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