Electric engine, electric propulsion device and aircraft

Abstract

The utility model provides an electric engine, an electric propulsion device and an aircraft, and relates to the technical field of aircrafts. The electric engine comprises a power motor, and a containing cavity is formed in the power motor; the motor controller is used for controlling the power motor, the motor controller is located in the containing cavity, and the motor controller comprises a bus capacitor and a power module; and the cooling plate is located in the accommodating cavity, and the cooling plate is used for carrying out liquid cooling heat dissipation on the bus capacitor and the power module. In this way, the difficulty of lightweight design of the electric engine can be reduced.

Description

TECHNICAL FIELD

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

[0002] The electric propulsion device is a direct source of power for an electric vertical take-off and landing (eVTOL) aircraft. The electric propulsion device includes a propeller and an electric motor. The electric motor includes a power motor, a motor controller and a heat dissipation system. The motor controller controls the power motor to drive the propeller to rotate. The heat dissipation system dissipates heat of the motor controller and the power motor to ensure normal operation of the electric motor. However, the existing electric motor has a complex design and a large weight, which increases the difficulty of lightweight design of the electric motor. UTILITY MODEL CONTENT

[0003] The present application aims to provide an electric motor, an electric propulsion device and an aircraft, which can reduce the difficulty of lightweight design of the electric motor.

[0004] In a first aspect, an electric motor is provided, which includes:

[0005] A power motor, the power motor is provided with a containing cavity;

[0006] A motor controller, the motor controller is used to control the power motor, the motor controller is located inside the containing cavity, and the motor controller includes a bus capacitor and a power module;

[0007] A cooling plate, the cooling plate is located inside the containing cavity, and the cooling plate is used to perform liquid cooling heat dissipation on the bus capacitor and the power module.

[0008] According to the present application, the power module and the bus capacitor are cooled by a single cooling plate. For example, the cooling plate can be arranged between the power module and the bus capacitor. At least the power module is attached to one side of the cooling plate, and the bus capacitor is attached to the other side of the cooling plate. In this way, the space in the containing cavity can be fully and reasonably utilized. On the basis of sufficient cooling and heat dissipation of the motor controller, the volume of the power motor can be reduced, the weight of the electric motor can be reduced, and the difficulty of lightweight design of the electric motor can be reduced.

[0009] In a possible implementation manner, the cooling plate includes:

[0010] A liquid inlet;

[0011] A liquid outlet;

[0012] A main cooling area;

[0013] The sub-cooling area is connected to the circumferential side of the main cooling area and communicates with the main cooling area, so that the cooling liquid flowing into the cooling plate through the liquid inlet flows through the main cooling area and the sub-cooling area and then flows out from the liquid outlet.

[0014] In some possible implementation manners, the number of the main cooling areas and the number of the sub-cooling areas are both two, the main cooling areas include a first main cooling area and a second main cooling area, and the first main cooling area and the second main cooling area are arranged separately; the sub-cooling areas include a first sub-cooling area and a second sub-cooling area, and the first sub-cooling area and the second sub-cooling area are arranged on the two sides of the main cooling area respectively; wherein,

[0015] The first sub-cooling area, the first main cooling area, the second sub-cooling area and the second main cooling area are sequentially connected in series, one of the first sub-cooling area and the second main cooling area is connected to the liquid inlet, and the other is connected to the liquid outlet; or

[0016] The first main cooling area and the second main cooling area are connected in parallel through the first sub-cooling area and the second sub-cooling area, one of the first sub-cooling area and the second sub-cooling area is connected to the liquid outlet, and the other is connected to the liquid outlet.

[0017] In some possible implementation manners, the first sub-cooling area includes a first cooling pipe, the second sub-cooling area includes a second cooling pipe, the first main cooling area includes a first cooling cavity, and the second main cooling area includes a second cooling cavity.

[0018] In a possible implementation manner, the power module includes a power motor power module and a drive motor power module.

[0019] Along the thickness direction of the cooling plate, the bus capacitor and the power motor power module are located on the two sides of the main cooling area respectively, and the drive motor power module is located on one side of the sub-cooling area, the main cooling area is used for heat dissipation of the bus capacitor and the power motor power module, and the sub-cooling area is used for heat dissipation of the drive motor power module.

[0020] In a possible implementation manner, the cooling plate has a receiving groove, and at least part of the power motor power module is located inside the receiving groove.

[0021] In a possible implementation manner, the motor controller further includes a first heat-conducting layer arranged between the drive motor power module and the cooling plate; and / or,

[0022] The motor controller further includes a second heat-conducting layer arranged between the bus capacitor and the cooling plate.

[0023] In a possible implementation manner, the power module further includes a variable-pitch motor power module; and / or,

[0024] The power module further includes a fan motor power module.

[0025] In a possible implementation, the power motor comprises a stator and a motor rear cover, the motor rear cover is connected to the stator and surrounds a receiving cavity with the stator; wherein the motor rear cover is provided with a liquid inlet flow channel and a liquid supply flow channel;

[0026] The electric motor further comprises a liquid pump, the liquid pump is communicated with the liquid inlet flow channel and the liquid supply flow channel;

[0027] The liquid inlet of the cooling plate is communicated with the outlet end of the liquid supply flow channel, and the liquid pump is used for making the cooling liquid flow through the liquid inlet flow channel, the liquid supply flow channel and the cooling plate in sequence.

[0028] In a possible implementation, the motor rear cover has a rear cover recess, and a part of the liquid pump is located inside the rear cover recess.

[0029] In a possible implementation, the groove bottom of the rear cover recess has a first opening and a second opening, the first opening is communicated with the liquid inlet flow channel and the inlet end of the liquid pump, and the second opening is communicated with the liquid supply flow channel and the outlet end of the liquid pump.

[0030] In a possible implementation, the liquid pump comprises a pump shell and a pump rotor, the pump shell has a pump cavity, and the pump rotor is arranged in the pump cavity;

[0031] The pump shell comprises a pump cover and a pump body, the pump cover and the pump body surround the pump cavity, at least a part of the pump body is located outside the rear cover recess and is fixedly connected with the motor rear cover, the pump cover is provided with an inlet joint part and an outlet joint part, the inlet joint part is inserted into the first opening so as to make the pump cavity communicated with the liquid inlet flow channel, and the outlet joint part is inserted into the second opening so as to make the pump cavity communicated with the liquid supply flow channel.

[0032] In a possible implementation, the electric motor further comprises:

[0033] a first sealing ring, the first sealing ring is sleeved on the outer wall of the inlet joint part and abuts against the pump cover and the groove bottom of the rear cover recess along the axial direction of the power motor; and / or,

[0034] a second sealing ring, the second sealing ring is sleeved on the outer wall of the outlet joint part and abuts against the pump cover and the groove bottom of the rear cover recess along the axial direction of the power motor.

[0035] In a possible implementation, the liquid pump comprises a pump body and a pump rotor, the pump body surrounds a pump cavity with the motor rear cover, and the pump rotor is arranged in the pump cavity.

[0036] In a possible implementation, the motor rear cover has a rear cover recess, and the pump body surrounds the pump cavity with the rear cover recess.

[0037] In a possible implementation, the stator comprises a stator frame body and a stator winding, the stator frame body is provided with a liquid cooling cavity and a flow equalization flow channel, and the stator winding is located inside the liquid cooling cavity;

[0038] The inlet end of the flow equalization channel is communicated with the liquid outlet of the cooling plate, or the inlet end of the flow equalization channel is communicated with the outlet end of the liquid supply channel; the flow equalization channel has a plurality of outlet ends arranged at intervals along the circumference of the stator frame body, and each outlet end of the flow equalization channel is communicated with the liquid cooling cavity.

[0039] In a possible implementation, the electric motor further comprises a radiator fixedly connected with the motor rear cover, and an outlet end of the radiator is communicated with the liquid inlet channel;

[0040] The motor rear cover is further provided with a liquid outlet channel, an inlet end of the liquid outlet channel is communicated with an outlet end of the liquid cooling cavity, or the outlet end of the liquid cooling cavity and the liquid outlet of the cooling plate are both communicated with the inlet end of the liquid outlet channel, and an outlet end of the liquid outlet channel is communicated with an inlet end of the radiator.

[0041] In a possible implementation, the electric motor further comprises:

[0042] A liquid outlet pipeline, the liquid outlet pipeline is communicated with the liquid inlet channel and the outlet end of the radiator;

[0043] A liquid inlet pipeline, the liquid inlet pipeline is communicated with the liquid outlet channel and the inlet end of the radiator.

[0044] In a possible implementation, the electric motor further comprises:

[0045] 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 for dissipating heat of the radiator.

[0046] In a possible implementation, the liquid pump comprises:

[0047] A driving motor, a first output end of the driving motor is drivingly connected with the fan, and a second output end of the driving motor is drivingly connected with a pump rotor inside the liquid pump, and the driving motor is used as a pump motor of the liquid pump and is used for driving the fan to rotate.

[0048] In a possible implementation, the electric motor further comprises a fan motor fixedly connected with the motor rear cover, the fan motor is drivingly connected with the fan, and the fan motor is used for driving the fan to rotate.

[0049] The second aspect of the embodiment of the application provides an electric propulsion device, the electric propulsion device comprising a propeller and the electric motor according to any one of the first aspect, the propeller being drivingly connected with the power motor of the electric motor, and the power motor being used for driving the propeller to rotate.

[0050] The third aspect of the embodiment of the application provides an aircraft, the aircraft comprising a fuselage, a wing, a tail wing and the electric propulsion device according to the second aspect, the electric propulsion device being arranged on the wing and / or the fuselage and / or the tail wing. BRIEF DESCRIPTION OF DRAWINGS

[0051] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0052] Figure 1 A schematic diagram of the three-dimensional structure of an aircraft provided in an embodiment of the present application;

[0053] Figure 2 A schematic diagram of the architecture of an electric propulsion device provided in an embodiment of the present application;

[0054] 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;

[0055] Figure 4 A schematic diagram of the structure of an electric engine provided in an embodiment of the present application;

[0056] Figure 5 A schematic diagram of the structure of the motor rear cover provided in an embodiment of the present application;

[0057] Figure 6a for Figure 4 a schematic cross-sectional view of the electric engine shown;

[0058] 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;

[0059] Figure 7a A schematic diagram of the structure of the cooling plate provided in an embodiment of the present application;

[0060] Figure 7b for Figure 7a A schematic diagram of the three-dimensional structure of the cooling plate and the motor controller shown;

[0061] Figure 8 A schematic diagram of the planar structure of the stator provided in an embodiment of the present application;

[0062] Figure 9 A schematic diagram of the partial structure of the power motor provided in an embodiment of the present application.

[0063] Description of reference numerals:

[0064] 11. Fuselage; 12. Wings; 13. Tail; 14. Arms; 15. Nacelle;

[0065] 20. Electric propulsion device; 20a. Fixed electric propulsion device; 20b. Tilting electric propulsion device; 21. Electric engine; 22. Propeller;

[0066] 100, power motor;

[0067] 110, stator; 111, stator support; 112, stator winding; 113, support assembly; 114, liquid cooling flow channel; 115, liquid cooling cavity; 116, flow equalization channel; 1161, annular flow channel; 1162, branch flow channel; 117, winding flow channel; 118, winding liquid inlet; 119, stator core assembly;

[0068] 120, rotor; 121, rotor housing; 122, magnetic steel;

[0069] 130, motor rear cover; 131, liquid inlet flow channel; 132, liquid supply flow channel; 133, liquid outlet flow channel; 1331, first liquid outlet sub-flow channel; 1332, second liquid outlet sub-flow channel; 134, low-temperature liquid inlet; 135, low-temperature liquid outlet; 136, high-temperature liquid outlet; 137, high-temperature liquid inlet; 138, rear cover groove; 1381, first opening; 1382, second opening; 139, mounting hole;

[0070] 140, containing cavity;

[0071] 150, first sealing ring;

[0072] 160, second sealing ring;

[0073] 170, third sealing ring;

[0074] 200, liquid pump;

[0075] 210, pump shell; 2111, pump cover; 211, body part; 212, outlet joint part; 213, inlet joint part; 2112, pump body;

[0076] 220, pump rotor;

[0077] 230, pump cavity;

[0078] 240, drive motor;

[0079] 300, heat sink;

[0080] 400, fan;

[0081] 500, liquid inlet pipeline;

[0082] 600, liquid outlet pipeline;

[0083] 700, motor controller; 710, bus capacitor; 720, power motor power module; 730, drive motor power module; 740, drive board; 750, main control board;

[0084] 800, cooling plate; 810, main cooling area; 810A, first main cooling area; 810B, second main cooling area; 811, first cooling cavity; 812, second cooling cavity;

[0085] 820, sub-cooling area; 820A, first sub-cooling area; 820B, second sub-cooling area; 821, first cooling pipe; 822, second cooling pipe; 830, liquid inlet; 840, liquid outlet. DETAILED DESCRIPTION

[0086] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0087] It should be noted that the terms "first", "second" are used only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0088] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, or detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be the connection or interaction relationship between two elements, unless otherwise explicitly limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0089] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0090] In the above description, the description with reference to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the present specification and the features of the different embodiments or examples, without contradiction.

[0091] The embodiments of the present application provide a kind of aircraft, which can be electric vertical take-off and landing aircraft (electric vertical take-off and landing, eVTOL), can also be other types of aircraft.

[0092] Figure 1 A kind of aircraft provided by the embodiments of the present application is shown in the perspective structure schematic diagram. Among them, Figure 1 The aircraft shown is only for illustration, and does not constitute the specific structure and shape of the aircraft.

[0093] As Figure 1 Indicated, the aircraft includes fuselage 11, wing 12 and tail 13. Among them, fuselage 11 is symmetrical structure, the rest of the structure and shape of fuselage 11 is not limited, can refer to the fuselage structure of existing aircraft. Wing 12 is fixedly connected on fuselage 11, and extends along the both sides of fuselage 11, the wing 12 on both sides is symmetrical relative to the symmetry plane of fuselage 11, the structure of wing 12 can also refer to the fixed wing structure of existing aircraft, hereinafter will not be repeated. Tail 13 is arranged at the tail of fuselage 11, tail 13 is integrally formed or mechanically connected with fuselage 11, and is symmetrical structure. The structure of tail 13 can also refer to the tail structure of existing aircraft, hereinafter will not be repeated.

[0094] It should be noted that in some scenarios, the aircraft can also include fuselage 11 and wing 12, i.e. the aircraft does not include tail 13.

[0095] As Figure 1 Indicated, the aircraft further includes electric propulsion device 20, which can be used to provide power for the aircraft. The number of electric propulsion device 20 is one or more electric propulsion device 20, for example Figure 1 Indicated, the aircraft includes eight electric propulsion devices 20.

[0096] Electric propulsion device 20 is arranged on fuselage 11 and / or wing 12 and / or tail 13, for example Figure 1As shown, the wing 12 and the tail 13 are each symmetrically provided with the electric propulsion device 20. 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 the electric propulsion device 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 the electric propulsion device 20. In yet 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 the electric propulsion device 20.

[0097] With continued reference to Figure 1 As shown, the aircraft further includes a boom 14 and a nacelle 15, which are each used to connect the electric propulsion device 20 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 can also include one of the boom 14 and the nacelle 15.

[0098] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is set on the wing 12 through the boom 14. In other embodiments, the electric propulsion device 20 can also be set on the wing 12 through the nacelle 15 (not shown in the figure).

[0099] In some embodiments, as Figure 1 As shown, the electric propulsion device 20 is set on the tail 13 through the nacelle 15. In other embodiments, the electric propulsion device 20 can also be set on the tail 13 through the boom 14 (not shown in the figure).

[0100] In some examples, the electric propulsion device 20 set on the aircraft can include a fixed electric propulsion device 20a, which is fixedly connected to any one of the fuselage 11, the wing 12, and the tail 13.

[0101] In some examples, the electric propulsion device 20 set on the aircraft can include a tilting electric propulsion device 20b, which is provided with a tilting mechanism between any one of the fuselage 11, the wing 12, and the tail 13, and the tilting mechanism is used to adjust the tilting angle of the tilting electric propulsion device 20b.

[0102] In some examples, all the electric propulsion devices 20 set on the aircraft are fixed electric propulsion devices 20a.

[0103] In other examples, all the electric propulsion devices 20 set on the aircraft are tilting electric propulsion devices 20b.

[0104] In yet other examples, part of the electric propulsion devices 20 set on the aircraft are fixed electric propulsion devices 20a, and part of the electric propulsion devices 20 are tilting electric propulsion devices 20b, for example Figure 1As 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.

[0105] In this embodiment, the electric propulsion device 20 is composed of a power battery (not shown), an electric motor 21, a propeller 22, and their accessories. The electric motor 21 is a system consisting of a power motor 100, a motor controller 700, cables, and their accessories, which converts electrical energy into mechanical energy. In actual implementation, the electric motor 21 can also be referred to as an electric propulsion system.

[0106] Among them, such as Figure 1 As shown, the electric engine 21 is arranged on the arm 14 or the nacelle 15, and the propeller 22 is arranged on one side of the electric engine 21. The electric engine 21 is transmission-connected to the propeller 22, and the electric engine 21 is used to drive the propeller 22 to rotate.

[0107] 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 in transmission connection with the propeller 22. The motor controller 700 is electrically connected to the power motor 100, and the motor controller 700 is used to control the power motor 100 to operate so that the power motor 100 drives the propeller 22 to rotate.

[0108] 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.

[0109] like Figure 2 As shown, the motor controller 700 can be disposed inside the stator 110 of the power motor 100 , so as to facilitate fixing the motor controller 700 and facilitate electrical connection between the motor controller 700 and the power motor 100 .

[0110] During operation, the power motor 100 continuously accumulates heat, causing the temperature inside the power motor 100 to continuously increase. Therefore, the electric motor 21 may also be configured with a heat dissipation system to dissipate heat from the electric motor 21 and ensure stable and reliable operation of the electric motor 21.

[0111] The heat dissipation system can 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, the power motor 100 is internally arranged with a cooling flow channel, the cooling flow channel is in communication with the radiator 300, and the radiator 300 and the cooling flow channel jointly form a cooling liquid circulation loop for the cooling liquid to flow. The liquid pump 200 can be installed on the shell of the power motor 100, and the liquid pump 200 is used to drive the cooling liquid to circulate and flow in the cooling liquid circulation loop. The fan motor is in transmission connection with the fan 400, the fan motor can be installed on the shell of the power motor 100, and the fan motor drives the fan 400 to rotate to accelerate the air flow and blow the air flow to the radiator 300 to dissipate heat for the radiator 300.

[0112] The liquid pump 200 sends the low-temperature cooling liquid into the cooling flow channel in the power motor 100, the low-temperature cooling liquid flows along the cooling flow channel, absorbs the heat (for example, the heat generated by the stator winding 112) in the power motor 100, and is converted into high-temperature cooling liquid. The high-temperature cooling liquid flows into the radiator 300 to exchange heat with the air, and the cooled cooling liquid is converted into low-temperature cooling liquid again, which enters the cooling flow channel in the power motor 100 through the liquid pump 200 again to dissipate heat and cool the power motor 100. Such circulation can timely take away the heat generated in the power motor 100, so that the temperature in the power motor 100 is within a suitable range, and the output power of the power motor 100 is ensured.

[0113] However, the existing electric motor 21 configured heat dissipation system has a complex design, a long cooling pipeline of the heat dissipation system, an increased weight of the cooling liquid in the heat dissipation system, and a large space occupied by the heat dissipation system. The light weight of the electric motor 21 is limited, which makes it difficult to arrange the electric motor 21 on the aircraft and affects the aerodynamic design of the aircraft. In addition, the heat dissipation system also has problems of low heat dissipation efficiency and poor heat dissipation effect.

[0114] Therefore, the electric motor 21 is provided in the embodiments of the present application, and the heat dissipation system of the electric motor 21 is designed. The structures of the power motor 100, the motor controller 700, the liquid pump 200, and the radiator 300 are designed to be integrated, the space is effectively utilized, and the electric motor 21 is more compact. The cooling flow channel in the power motor 100 is designed to be integrated, the volume of the power motor 100 is reduced, and the structural strength of the power motor 100 is improved. The structure of the cooling flow channel is designed to be reasonable, the heat dissipation efficiency and the heat dissipation effect of the heat dissipation system are improved. The radiator 300 can be supported and fixed on the power motor 100 by using the liquid pipeline.

[0115] The electric motor 21 of the embodiments of the present application is described in detail below.

[0116] Figure 3 The working schematic diagram of the heat dissipation system of the electric engine 21 is provided for the embodiments of the present application. Referring to Figure 3 As shown in the figure, the electric engine 21 can include a power motor 100 and a motor controller 700, the motor controller 700 is electrically connected with the power motor 100 to control the power motor 100 to work. The power motor 100 has a containing cavity 140, and the motor controller 700 can be located in the containing cavity 140.

[0117] Among them, the power motor 100 can include a stator 110, a rotor 120 and a motor rear cover 130, the stator 110 is fixedly connected with the motor rear cover 130, and the stator 110 and the motor rear cover 130 jointly enclose the containing cavity 140, and the rotor 120 can be arranged on the side of the stator 110 away from the motor rear cover 130, for example, the rotor 120 can be sleeved outside the stator 110.

[0118] Among them, the rotor 120 includes a rotor shell 121 and a magnetic steel 122 connected inside the rotor shell 121, and the rotor shell 121 is fixedly connected with the hub of the propeller 22, so as to realize the transmission connection between the power motor 100 and the propeller 22.

[0119] The electric engine 21 can further include a radiator 300 and a liquid pump 200. The radiator 300 is connected with the power motor 100, for example, the radiator 300 is connected with the motor rear cover 130 of the power motor 100. The liquid pipeline is connected between the radiator 300 and the power motor 100, and the 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 on the liquid pipeline between the radiator 300 and the power motor 100, and the liquid pump 200 is used to drive the cooling liquid in the liquid pipeline to circulate between the radiator 300 and the power motor 100.

[0120] The electric engine 21 further includes a fan 400, and the liquid pump 200 includes a driving motor 240, which is a pump motor of the liquid pump 200 itself. The fan 400 is in transmission connection with the driving motor 240, and the driving 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, that is, the fan 400 borrows the driving motor 240 of the liquid pump 200. Of course, in some scenarios, the electric engine 21 can further include a fan motor, which can be fixedly connected with the shell (for example, the motor rear cover 130) of the power motor 100, and the fan motor is in transmission connection with the fan 400, and 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 driving motor 240 of the liquid pump 200.

[0121] The fan 400 is driven to rotate to accelerate the flow of ambient air, and the air flow is blown to the radiator 300 to accelerate the heat exchange between the radiator 300 and the ambient air. For example, the fan 400 is connected to the side of the driving motor 240 facing the radiator 300, so that the fan 400 blows air directly to the radiator 300.

[0122] 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 form a heat dissipation system of the electric engine 21. The liquid pump 200 drives the cooling liquid to circulate between the radiator 300 and the power motor 100 to cool 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, and cools the cooling liquid in the radiator 300, so that the cooling liquid can continuously cool the power motor 100.

[0123] In this embodiment, the cooling plate 800 is arranged 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. The cooling plate 800 is formed with a liquid flow channel, and the liquid flow channel in the cooling plate 800 is in communication with the radiator 300, and the cooling liquid can flow along the liquid flow channel in the cooling plate 800. The cooling liquid in the cooling plate 800 exchanges heat with the components attached to the surface of the cooling plate 800 to cool the components.

[0124] In addition, the stator 110 of the power motor 100 is also formed with a liquid flow channel, and the liquid flow channel in the stator 110 is used to cool the stator winding 112 arranged in the stator 110. In this way, the stator winding 112 can be maintained at a suitable ambient temperature, so as to ensure the stability and reliability of the power motor 100 and improve the working performance of the power motor 100.

[0125] On this basis, the motor rear cover 130 of the power motor 100 is also integrated with a liquid flow channel, and the liquid flow channel on the motor rear cover 130 is also in communication with the radiator 300, and the cooling liquid can flow along the liquid flow channel on the motor rear cover 130. The cooling liquid in the motor rear cover 130 also exchanges heat with the components in the power motor 100 to cool the components in the power motor 100.

[0126] In this way, the radiator 300 is in communication with 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 cooling liquid in the liquid pipeline can flow through the cooling plate 800, the stator 110, and the motor rear cover 130, thereby increasing the flow of the cooling liquid in the power motor 100, and increasing the flow area of the cooling liquid in the power motor 100, so as to improve the heat dissipation efficiency and effect of the power motor 100.

[0127] like Figure 3 As shown in the direction of the black arrow in the figure, in some examples, the liquid flow channel on the motor back cover 130, the liquid flow channel in the cooling plate 800, and the liquid flow channel in the stator 110 can be connected in series in sequence. After the coolant in the radiator 300 flows out from the liquid pipeline, it flows through the motor back cover 130, the cooling plate 800 and the stator 110 in sequence, and then returns from the stator 110 to the motor back cover 130, and finally flows back from the motor back cover 130 to the radiator 300. In this way, the cooling system has a lower demand on the total flow rate of the coolant, which can reduce the cooling cost. In addition, the pressure generated by the coolant in the liquid flow channel of the power motor 100 is relatively small, and the sealing strength requirement for the liquid flow channel is relatively low. In addition, the demand for the heat dissipation power of the radiator 300 is relatively low, which is conducive to saving the efficiency of the radiator 300.

[0128] In other examples, the liquid flow channel in the cooling plate 800 can also be connected in parallel with the liquid flow channel in the stator 110. After the coolant in the radiator 300 flows through the motor rear cover 130, it is divided into two paths, flowing through the cooling plate 800 and the stator 110 respectively. After merging and returning to the motor rear cover 130, it flows back to the radiator 300 through the liquid pipeline. Alternatively, the liquid flow channel on the motor rear cover 130 can also be connected in parallel with the liquid flow channel in the cooling plate 800. After the coolant in the radiator 300 flows out of the liquid pipeline, it is divided into two paths, flowing through the motor rear cover 130 and the cooling plate 800 respectively. After merging again, it enters the stator 110 and then returns to the radiator 300 from the stator 110. Alternatively, the liquid flow channel on the motor rear cover 130, the liquid flow channel in the cooling plate 800, and the liquid flow channel in the stator 110 are all connected in parallel. After the coolant in the radiator 300 flows out from the liquid pipeline, it is divided into three paths and flows through the motor rear cover 130, the cooling plate 800 and the stator 110 respectively, and then merges from the liquid pipeline and returns to the radiator 300.

[0129] Thus, when the output power is the same, compared to the method in which the motor rear cover 130, cooling plate 800, and stator 110 are connected in series, when the power motor 100 has parallel liquid flow channels, the coolant flows through the parallel liquid flow channels simultaneously, and the cooling system has a higher cooling efficiency for the power motor 100. At the same time, the cooling system requires a greater total flow rate of coolant, and the heat dissipation cost is relatively high. The coolant exerts greater pressure on the liquid flow channels, and the sealing strength requirements of the liquid flow channels are higher. The heat dissipation power requirements of the radiator 300 are also higher.

[0130] The following are all Figure 3 The liquid flow channels of the motor rear cover 130, the liquid flow channels of the cooling plate 800 and the liquid flow channels of the stator 110 are connected in series in sequence. The coolant flows through the motor rear cover 130, the cooling plate 800 and the stator 110 in sequence and then flows back from the motor rear cover 130 to the radiator 300 as an example for explanation.

[0131] Specifically, the heat sink 300 and the motor 100 are connected with the liquid outlet pipeline 600 and the liquid inlet pipeline 500, and the heat sink 300 has an outlet end and an inlet end. The inlet end of the liquid outlet pipeline 600 is communicated with the outlet end of the heat sink 300, and the outlet end of the liquid outlet pipeline 600 is communicated with the liquid flow channel of the motor 100. The inlet end of the liquid inlet pipeline 500 is communicated with the motor 100, and the outlet end of the liquid inlet pipeline 500 is communicated with the inlet end of the heat sink 300. The cooling liquid in the heat sink 300 flows out from the outlet end, flows into the liquid flow channel of the motor 100 through the liquid outlet pipeline 600, exchanges heat with the components in the motor 100, and then flows back into the heat sink 300 through the liquid inlet pipeline 500 and the inlet end of the heat sink 300.

[0132] 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 sequentially connected, the outlet end of the liquid outlet pipeline 600 is communicated with the liquid flow channel on the motor rear cover 130, and the inlet end of the liquid inlet pipeline 500 is also communicated with the liquid flow channel on the motor rear cover 130. At this time, the cooling liquid in the heat sink 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 cooling liquid flows through the cooling plate 800 and the stator 110 from the motor rear cover 130 in turn, flows out from the stator 110 and then flows back into the motor rear cover 130, and finally flows back into the heat sink 300 through the liquid inlet pipeline 500.

[0133] Continuing to refer to Figure 3 As shown, the motor controller 700 located in the accommodating cavity 140 surrounded by the stator 110 and the motor rear cover 130 can 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 can also include a drive board 740, the drive board 740 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.

[0134] 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, at least the power module is attached to one side of the cooling plate 800, and the bus capacitor 710 is 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 motor 100 can be reduced on the basis of fully cooling and dissipating heat of the motor controller 700.

[0135] The power modules can include a power motor power module 720 and a drive motor power module 730. The power motor power module 720 is configured to control the output power of the power motor 100, and the drive motor power module 730 is configured to control the output power of the drive motor 240. For example, as shown in FIG. 7, 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 space occupied by the power modules. Of course, the drive motor power module 730 can also be arranged on the side where the bus capacitor 710 is located, and the embodiments of the present application do not limit this. Figure 3

[0136] It should be noted that in the present embodiment, the drive motor 240 is not only the pump motor of the liquid pump 200 but also drives the fan 400, that is, the liquid pump 200 and the fan 400 share one motor. At this time, by controlling the output power of the drive motor 240 through the drive motor power module 730, the fan 400 and the liquid pump 200 can be controlled to work simultaneously. In some embodiments, the drive motor 240 can also be used only as the pump motor of the liquid pump 200, and a fan motor can be additionally arranged to drive the fan 400. At this time, the power module integrated on the motor controller 700 can also include a fan motor power module for controlling the output power of the fan motor. The fan motor power module can be arranged on the same side as the power motor power module, or the fan motor power module can be arranged on the same side as the bus capacitor 710.

[0137] In addition, the power module integrated on the motor controller 700 can also include a variable pitch motor power module for driving a variable pitch mechanism for controlling 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 can be arranged on the same side as the bus capacitor 710.

[0138] For example, the number of bus capacitors 710 is two, and the number of power modules can also be two. The bus capacitors 710 and the power modules can be arranged one by one, and the devices on the motor controller 700 can be divided into two groups. In this way, when the motor controller 700 is working, the two groups of devices can work simultaneously, and when one group of devices cannot work normally, the other group of devices can still work normally. Alternatively, one group of devices in the two groups of devices serves as a commonly used group, and the other group of devices serves as a backup group. Normally, the commonly used group works, and when the commonly used group cannot work normally, the backup group is switched to work.

[0139] In this way, by arranging two groups of devices, the motor controller 700 is redundantly designed. The working mode of the motor controller 700 is more flexible, the reliability is higher, and the working performance of the electric motor 21 can be improved. ​

[0140] For example, as shown in FIG. 7, the power module includes a power motor power module 720 and a drive motor power module 730. Two bus capacitors 710 are arranged side by side on two sides of a plate surface of a cooling plate 800, two power motor power modules 720 can be arranged side by side on two sides of another plate surface of the cooling plate 800 corresponding to the two bus capacitors 710, and two drive motor power modules 730 can be arranged outside the two power motor power modules 720, respectively. Figure 3

[0141] Of course, when the power module further includes a variable pitch motor power module, the number of the variable pitch motor power module can also be two, and the two variable pitch motor power modules can be symmetrically arranged. When the power module further includes a fan motor power module, the number of the fan motor power module can also be two, and the two fan motor power modules can also be symmetrically arranged.

[0142] Figure 4 A structure schematic diagram of the electric motor 21 is provided for the embodiments of the present application. Referring to FIG. 8, the diagram shows a liquid outlet pipeline 600 and a liquid inlet pipeline 500 connected between the radiator 300 and the power motor 100. The liquid outlet pipeline 600 can be connected between an outlet end of the radiator 300 and the motor rear cover 130, and the low-temperature cooling liquid in the radiator 300 flows into the liquid flow channel in the motor rear cover 130 through the liquid outlet pipeline 600. The liquid inlet pipeline 500 is connected between an inlet end of the radiator 300 and the motor rear cover 130, and the high-temperature cooling liquid in the liquid flow channel of the motor rear cover 130 flows back to the radiator 300 through the liquid inlet pipeline 500. Figure 4

[0143] Of course, if the cooling liquid in the power motor 100 does not flow back into the radiator 300 through the motor rear cover 130, the liquid inlet pipeline 500 can also be connected with other components in the power motor 100. For example, an inlet end of the liquid inlet pipeline 500 is connected with an outlet end of the liquid flow channel of the stator 110.

[0144] 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 in parallel, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can both be used as a main pipeline. The liquid outlet pipeline 600 can be in communication with the motor rear cover 130, the cooling plate 800, and the stator 110 through respective liquid outlet branch pipelines, and the liquid inlet pipeline 500 can be in communication with the motor rear cover 130, the cooling plate 800, and the stator 110 through respective liquid inlet branch pipelines.

[0145] ​​In the embodiment, at least one of the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can serve as a support structure, and can connect the radiator 300 and the liquid flow channel in the power motor 100, and can also fix the radiator 300 and the shell of the power motor 100 through the at least one of the liquid outlet pipeline 600 and the liquid inlet pipeline 500, that is, the radiator 300 is rigidly connected with the shell 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 with the motor rear cover 130 through the liquid outlet pipeline 600 and the liquid inlet pipeline 500, or the radiator 300 is fixedly connected with the stator 110 through the liquid outlet pipeline 600 and the liquid inlet pipeline 500. In this way, without additional support structure or connecting structure to connect the radiator 300 and the power motor 100, the structure of the electric motor 21 can be simplified, and the manufacturing cost of the electric motor 21 can be reduced.

[0146] The liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 serving as the support structure can be made of a metal material or a hard plastic, and the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 is a rigid pipeline, that is, the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 is a rigid pipe. In this way, the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 has high structural strength, and can meet the support requirement between the radiator 300 and the power motor 100. For example, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can both be rigid pipelines.

[0147] Continuing 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 of the cooling liquid circulating between the radiator 300 and the power motor 100 can be large, and the cooling effect of the power motor 100 can be improved. Moreover, when the liquid outlet pipeline 600 and / or the liquid inlet pipeline 500 can also serve as a support structure, by increasing the number of the liquid outlet pipelines 600 and the liquid inlet pipelines 500, and arranging the liquid outlet pipelines 600 and the liquid inlet pipelines 500 at intervals along the circumference of the power motor 100, the support of the radiator 300 by the liquid outlet pipelines 600 and / or the liquid inlet pipelines 500 can be enhanced, and the radiator 300 can be firmly and stably connected to the power motor 100.

[0148] And, in the circumferential direction of the power motor 100, the liquid outlet pipeline 600 and the liquid inlet pipeline 500 can be arranged alternately. In this way, the design of the liquid flow channel on the motor rear cover 130 can be 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 more balanced, and the cooling effect of the power motor 100 can be improved. Moreover, the force of the cooling liquid in the liquid flow channel on the motor rear cover 130 is more uniform, and the stability and reliability of the motor rear cover 130 can be improved.

[0149] In addition, as shown in Figure 4 In 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 can include a hub (not shown in the figure), a shroud, and fan blades (not shown in the figure). A plurality of fan blades are arranged around the hub, one end of the fan blade is fixedly connected with the hub, the other end of the fan blade is a free end, the hub and the fan blades are located inside the shroud, and the hub is used for transmission connection with the driving motor 240 or the fan motor. The shroud of the fan 400 can be connected with the radiator 300, and the shroud of the fan 400 is fixed by the radiator 300. When the driving motor 240 drives the fan 400 and the liquid pump 200 at the same time, the first output end in the axial direction of the driving motor 240 can be fixedly connected with the hub of the fan 400, and the second output end in the axial direction of the driving motor 240 can be transmission connected with the pump rotor 220 of the liquid pump 200.

[0150] Figure 5 The structure schematic diagram of the motor rear cover 130 provided by the embodiment of the present application is shown. Referring to Figure 5 As shown, the liquid inlet flow channel 131 and the liquid supply flow channel 132 are integrated on the motor rear cover 130, and the low-temperature liquid inlet port 134 and the low-temperature liquid outlet port 135 are also provided on the motor rear cover 130. The liquid outlet pipeline 600 connected with the radiator 300 is in communication with the low-temperature liquid inlet port 134 on the motor rear cover 130, the low-temperature liquid inlet port 134 is in communication with the liquid inlet flow channel 131, and the outlet end of the liquid inlet flow 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 flow channel 132, the low-temperature liquid outlet port 135 is in communication with the liquid supply flow channel 132, the low-temperature liquid outlet port 135 can be used as the outlet end of the liquid supply flow channel 132, and the inlet end of the cooling plate 800 can be in communication with the low-temperature liquid outlet port 135.

[0151] The low-temperature cooling liquid flows out from the radiator 300 through the liquid outlet pipeline 600, and then flows into the liquid inlet flow channel 131 through the low-temperature liquid inlet port on the motor rear cover 130. As shown by the black arrow direction in Figure 5 The low-temperature cooling liquid flows along the liquid inlet flow channel 131 under the driving action of the liquid pump 200, and enters the liquid pump 200 from the inlet end of the liquid pump 200. As shown by the black arrow direction in Figure 5As shown by the black arrow direction in the liquid supply passage 132, the cooling liquid flows out of the outlet end of the liquid pump 200, enters the inlet end of the liquid supply passage 132, flows along the liquid supply passage 132, and then flows out of the low-temperature liquid outlet 135. The low-temperature cooling liquid flowing out of the low-temperature liquid outlet 135 flows into the cooling plate 800 to cool the bus capacitor 710, the power module, and other heat generating components. Then, the low-temperature cooling liquid flows into the stator 110 to cool the stator winding 112 and other components.

[0152] It can be understood that the above describes a mode in which the liquid passage in the cooling plate 800 and the liquid passage in the stator 110 are sequentially connected in series. When the liquid passage in the cooling plate 800 and the liquid passage 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 respectively communicated with the low-temperature liquid outlet 135 on the motor rear cover 130. At this time, the low-temperature cooling liquid flowing out of the low-temperature liquid outlet 135 flows into the cooling plate 800 and the stator 110 respectively to cool the bus capacitor 710, the power module, the stator winding 112, and other heat generating components.

[0153] Continuing to refer to Figure 5 As shown in the figure, the motor rear cover 130 also integrates a liquid outlet passage 133, and the motor rear cover 130 also has a high-temperature liquid inlet 137 and a high-temperature liquid outlet 136. The high-temperature liquid inlet 137 can be communicated with the outlet end of the stator 110, and the high-temperature liquid inlet 137 is communicated with the liquid outlet passage 133, and the high-temperature liquid inlet 137 serves as the inlet end of the liquid outlet passage 133. The high-temperature liquid outlet 136 is also communicated with the liquid outlet passage 133, and the high-temperature liquid outlet 136 serves as the outlet end of the liquid outlet passage 133, and the liquid inlet pipeline 500 connected to the radiator 300 can be communicated with the high-temperature liquid outlet 136.

[0154] After cooling the bus capacitor 710, the power module, the stator winding 112, and other heat generating components, the high-temperature cooling liquid flows out of the outlet end of the stator 110, enters the liquid outlet passage 133 of the motor rear cover 130 through the high-temperature liquid inlet 137. As Figure 5 As shown by the black arrow direction in the liquid outlet passage 133, the high-temperature cooling liquid flows along the liquid outlet passage 133, and then flows out of the high-temperature liquid outlet 136 and returns to the radiator 300 through the liquid inlet pipeline 500, and the radiator 300 cools the high-temperature cooling liquid into low-temperature cooling liquid.

[0155] Similarly, the above also describes a mode in which the liquid passage in the cooling plate 800 and the liquid passage in the stator 110 are sequentially connected in series, and then the cooling liquid returns to the motor rear cover 130. When the liquid passage in the cooling plate 800 and the liquid passage in the stator 110 are connected in parallel, the cooling liquid flowing out of the cooling plate 800 and the cooling liquid flowing out of the stator 110 can be mixed and then enter the liquid outlet passage 133 through the high-temperature liquid inlet 137.

[0156] With reference to the foregoing Figure 5 As shown, as an example, the motor rear cover 130 can be integrated with a liquid inlet channel 131, which can extend from the middle of the motor rear cover 130 to the opposite two side edges of the motor rear cover 130. In this way, the liquid inlet channel 131 has a large extension length, and occupies a large radial area of the motor rear cover 130, thus having a good cooling effect on the motor rear cover 130.

[0157] On this basis, the liquid inlet channel 131 can be arranged close to the middle area of the motor rear cover 130, so as to reduce the distance between the liquid inlet channel 131 and the liquid pump 200 arranged at the center of the motor rear cover 130, and 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 line, and the two ends of the liquid inlet channel 131 are approximately located on the same radial line of the motor rear cover 130, and the middle part of the liquid inlet channel 131 avoids the liquid pump 200 arranged at the center of the motor rear cover 130.

[0158] At this time, the low-temperature liquid inlet 134 can be arranged at the two ends of the liquid inlet channel 131 in the length direction, and the middle part of the liquid inlet channel 131 is provided with an opening, which serves as the outlet end of the liquid inlet channel 131 and communicates with the inlet end of the liquid pump 200. In this way, the cooling liquid is simultaneously delivered into the liquid inlet channel 131 from the two low-temperature liquid inlets 134, and the flow rate of the cooling liquid in the liquid inlet channel 131 is large and fast, which can improve the cooling efficiency of the power motor 100 and enhance the cooling effect of the power motor 100. Moreover, the distance between the middle part of the liquid inlet channel 131 and the liquid pump 200 is the smallest, and the driving effect of the liquid pump 200 on the cooling liquid in the liquid inlet channel 131 is good, so that the cooling liquid can quickly pass through the liquid pump 200 and enter the liquid supply channel 132. In addition, the liquid outlet pipeline 600 connected to the radiator 300 can communicate with the low-temperature liquid inlet 134 close to the edge of the motor rear cover 130, and when the liquid outlet pipeline 600 is a rigid pipeline, the liquid outlet pipeline 600 can have a better supporting effect between the radiator 300 and the power motor 100.

[0159] The motor rear cover 130 can also be integrated with a liquid supply channel 132, which can approximately extend along a straight line. One end of the liquid supply channel 132 can be arranged close to the center of the motor rear cover 130, and this end of the liquid supply channel 132 communicates with the outlet end of the liquid pump 200 as its inlet end. The other end of the liquid supply channel 132 can be away from the center of the motor rear cover 130, and this end of the liquid supply channel 132 communicates with the cooling plate 800 as its outlet end.

[0160] The motor rear cover 130 can be integrated with two liquid outlet channels 133, which can be located on both sides of the liquid inlet channel 131. The extension trend of the liquid outlet channel 133 can 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 rear cover 130 to the two side edges of the motor rear cover 130. The liquid outlet channel 133 can be arranged to be biased to the two side edges of the motor rear cover 130, and the liquid inlet channel 131 and the liquid supply channel 132 are located between the two liquid outlet channels 133. In this way, the high-temperature cooling liquid flowing back into the motor rear cover 130 is concentrated in the edge area of the motor rear cover 130, and the influence on the overall cooling degree of the motor rear cover 130 is smaller.

[0161] For example, the liquid outlet channel 133 can include a first liquid outlet sub-channel 1331 and a second liquid outlet sub-channel 1332. The first liquid outlet sub-channel 1331 can serve as a liquid outlet section of the liquid outlet channel 133, and the second liquid outlet sub-channel 1332 can 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. The two ends of the second liquid outlet sub-channel 1332 extend to the two side edges of the motor rear cover 130. In addition, 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 rear cover 130, the second liquid outlet sub-channel 1332 can extend along an arc line, and the middle of the second liquid outlet sub-channel 1332 can be convex toward the center of the motor rear cover 130 to reserve sufficient extension space for the first liquid outlet sub-channel 1331.

[0162] At this time, the high-temperature liquid inlet 137 can be provided at the two ends of the extension direction of the second liquid outlet sub-channel 1332, and the high-temperature liquid inlet 137 communicates with the two ends of the second liquid outlet sub-channel 1332. The high-temperature liquid outlet 136 can be provided at the 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 communicates with the end of the first liquid outlet sub-channel 1331. In this way, the high-temperature cooling liquid flowing out of the stator 110 enters the liquid outlet channel 133 from the two high-temperature liquid inlets 137 at the same time, and the flow rate of the cooling liquid in the liquid outlet channel 133 is large and fast, which can accelerate the circulation of the cooling liquid in the motor 100 and improve the cooling efficiency of the 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 pipeline 500 connected to the radiator 300 communicates with the high-temperature liquid outlet 136. When the liquid inlet pipeline 500 is a rigid pipeline, the liquid inlet pipeline 500 can provide better support between the radiator 300 and the motor 100.

[0163] As described 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 both ends of the liquid inlet channel 131 are provided with low-temperature liquid inlets 134. 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 edges of the motor rear cover 130, and both ends of the two liquid outlet channels 133 are provided with high-temperature liquid inlets 137, and the middle part is provided with high-temperature liquid outlets 136. 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 a radial line, and the two high-temperature liquid outlets 136 are approximately located on another radial line, and the two radial lines are approximately perpendicular. Correspondingly, the radiator 300 and the motor 100 are connected with two liquid outlet pipes 600 and two liquid inlet pipes 500, and the two liquid outlet pipes 600 and the two liquid inlet pipes 500 are approximately uniformly spaced along the circumference of the motor 100, and the liquid outlet pipe 600 and the liquid inlet pipe 500 are alternately arranged in sequence.

[0164] Of course, under the premise that the space on the motor rear cover 130 is sufficient, the motor rear cover 130 can also be provided with two, three or even more liquid inlet channels 131, and the motor rear cover 130 can also be provided with three, four or even more liquid outlet channels 133. The number of low-temperature liquid inlets 134 provided on the motor rear cover 130 can also be three, four or even more, the number of high-temperature liquid inlets 137 can also be five, six or even more, and the number of high-temperature liquid outlets 136 can also be three, four or even more. Alternatively, the motor rear cover 130 can also be provided with only one liquid outlet channel 133, 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 can also be less, and the present embodiment does not make specific limitation on this.

[0165] As for the formation of the liquid channel on the motor rear cover 130, a main plate body can be provided as the main support structure of the motor rear cover 130, and one or more than two auxiliary plate bodies are arranged on one side surface of the main plate body, and the auxiliary plate body and the main plate body jointly form the liquid inlet channel 131, the liquid supply channel 132 and the liquid outlet channel 133.

[0166] Since the liquid flow channel is integrated on the motor rear cover 130, the liquid flow channel can form a protruding reinforcing structure on the motor rear cover 130, which can enhance the structural strength of the motor rear cover 130. Moreover, the liquid flow channel is sealed by the plate-to-plate bonding manner, which can simplify the sealing structure of the liquid flow channel and enhance the sealing performance of the liquid flow channel. In addition, the additional liquid pipeline inside the power motor 100 is avoided, which can simplify the internal structure of the power motor 100, the internal layout structure of the power motor 100 is more reasonable, and it is beneficial to reduce the volume of the power motor 100 and improve the reliability of the power motor 100.

[0167] Figure 6a For Figure 4 a cross-sectional view of the electric motor engine, Figure 6b A partial structure diagram of the liquid pump 200 integrated on the motor rear cover 130 is provided in the embodiment of the present application. As shown in Figure 5 to Figure 6b 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 as to integrate the liquid pump 200 on the motor rear cover 130. In this way, the liquid pump 200 is directly fixed by the motor rear cover 130, and other structures for supporting and fixing the liquid pump 200 in the power motor 100 are not needed, which can reduce the number of components of the electric motor engine 21 and realize the lightweight of the electric motor engine 21. Moreover, 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 motor engine 21.

[0168] Specifically, referring to Figure 6a and Figure 6b As shown, the liquid pump 200 can include a pump shell 210 and a pump rotor 220. The pump shell 210 is fixedly connected with the motor rear cover 130, for example, the pump shell 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 shell 210, and the aforementioned drive motor 240 (or pump motor) is in transmission connection with the pump rotor 220. The drive motor 240 (or pump motor) drives the pump rotor 220 to rotate, so as to realize the flow of the cooling liquid in the liquid flow channel of the motor rear cover 130 by the liquid pump 200.

[0169] The liquid pump 200 integrated on the motor rear cover 130 has a pump cavity 230, the inlet end of the pump cavity 230 is in communication with the outlet end of the liquid inlet flow channel 131 on the motor rear cover 130, and the outlet end of the pump cavity 230 is in communication with the inlet end of the liquid supply flow channel 132 on the motor rear cover 130. The pump rotor 220 of the liquid pump 200 rotates to drive the cooling liquid in the liquid inlet flow channel 131 to enter the liquid pump 200 from the inlet end of the pump cavity 230, and the cooling liquid entering the liquid pump 200 flows into the liquid supply flow channel 132 from the outlet end of the pump cavity 230.

[0170] Continuing to refer toFigure 6a And Figure 6b In this embodiment, the motor rear cover 130 has a rear cover recess 138, which is arranged corresponding to the liquid pump 200, for example, the rear cover recess 138 is located in the central region of the motor rear cover 130. The rear cover recess 138 is recessed to 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 recess 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. Thus, 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 motor 21.

[0171] The inside of the groove bottom of the rear cover recess 138 is formed with two hollow flow channels, which are separated from each other. For example, the middle region of the groove bottom of the rear cover recess 138 is formed with a recessed part (not shown in the figure), which is recessed from the outer wall surface of the motor rear cover 130 to the inner wall surface of the motor rear cover 130, and separates the two hollow flow channels formed in the groove bottom of the rear cover recess 138. One of the two hollow flow channels communicates with the liquid inlet flow channel 131, or said one of the two hollow flow channels is part of the liquid inlet flow channel 131. The other of the two hollow flow channels communicates with the liquid supply flow channel 132, or said other of the two hollow flow channels is part of the liquid supply flow channel 132.

[0172] And, referring to Figure 6a And Figure 6b It is shown that the groove bottom of the rear cover recess 138 has a first opening 1381 and a second opening 1382 which are opened towards the inner wall surface of the motor rear cover 130. The first opening 1381 communicates with one of the two hollow flow channels, and the first opening 1381 communicates with the liquid inlet flow channel 131 through the hollow flow channel, for example, the first opening 1381 is the outlet end of the liquid inlet flow channel 131. The second opening 1382 communicates with the other of the two hollow flow channels, and the second opening 1382 communicates with the liquid supply flow channel 132 through the hollow flow channel, for example, the second opening 1382 is the inlet end of the liquid supply flow channel 132. The first opening 1381 communicates with the inlet end of the pump cavity 230, and the second opening 1382 communicates with the outlet end of the pump cavity 230, so as to realize that the cooling liquid in the liquid inlet flow channel 131 enters the liquid pump 200 through the first opening 1381, and the cooling liquid in the liquid pump 200 enters the liquid supply flow channel 132 through the second opening 1382.

[0173] As for the pump cavity 230 formed by the liquid pump 200, referring to Figure 6a And Figure 6bAs shown, as an embodiment, the liquid pump 200 itself forms the pump cavity 230, specifically, the pump shell 210 can include a pump body 2112 and a pump cover 2111, the pump body 2112 and the pump cover 2111 enclose the pump cavity 230. For example, in addition to the opening required to communicate with the motor rear cover 130, the pump shell 210 itself is formed into a relatively complete cladding structure, enclosing the pump rotor 220 inside. At this time, the pump cover 2111 is formed with an inlet end and an outlet end of the pump cavity 230, the pump cover 2111 can abut against the groove bottom of the rear cover groove 138, the inlet end on the pump cover 2111 corresponds to the first opening 1381 on the rear cover groove 138 to communicate, and the outlet end on the pump cover 2111 can correspond to the second opening 1382 on the rear cover groove 138 to communicate.

[0174] As another embodiment, the liquid pump 200 and the motor rear cover 130 jointly enclose the pump cavity 230, specifically, the pump body 2112 of the liquid pump 200 and the motor rear cover 130 enclose the pump cavity 230. For example, one end of the pump body 2112 towards the motor rear cover 130 can be an open end, the pump body 2112 abuts against the inner wall surface of the motor rear cover 130 outside the periphery of 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 surface of the pump body 2112 abuts against the groove bottom of the rear cover groove 138. The pump body 2112 covers the slot of the rear cover groove 138, the pump rotor 220 at least partially extends into the rear cover groove 138, and the pump body 2112, the rear cover groove 138 of the motor rear cover 130 (or the additional part of the inner wall surface outside the periphery of the rear cover groove 138) jointly enclose the pump cavity 230. At this time, the first opening 1381 of the groove bottom of the rear cover groove 138 can directly serve as the inlet end of the pump cavity 230, and the second opening 1382 can directly serve as the outlet end of the pump cavity 230.

[0175] As to the specific structure of the pump shell 210, in some embodiments, as shown in Figure 6a and Figure 6b The pump shell 210 can include a pump body 2112 and a pump cover 2111. One end of the pump body 2112 towards the motor rear cover 130 is open, and the pump cover 2111 is connected to the end of the pump body 2112, and the pump cover 2111 covers the opening of the pump body 2112. In this way, the pump body 2112 and the pump cover 2111 jointly enclose the pump cavity 230 of the pump shell 210, facilitating the pump rotor 220 to be installed into the pump shell 210.

[0176] 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 groove bottom of the rear cover groove 138. The part of the outer side wall of the pump body 2112 located in the rear cover groove 138 can abut against the inner side wall of the rear cover groove 138. Of course, in some scenarios, the pump body 2112 can also extend into the rear cover groove 138.

[0177] As shown in Figure 6a and Figure 6b , the pump cover 2111 includes a body part 211, an inlet joint part 213 and an outlet joint part 212. The inlet joint part 213 and the outlet joint part 212 can be arranged on the side end face of the body part 211 towards the groove bottom of the rear cover groove 138. The inlet joint part 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 part 213 serves as the inlet end of the pump cavity 230. The outlet joint part 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 part 212 serves as the outlet end of the pump cavity 230.

[0178] It should be noted that, with the paper direction shown in 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, and correspondingly, the inlet joint part 213 is located on the left side of the pump cover 2111, and the outlet joint part 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 can be located on the left side of the rear cover groove 138, and correspondingly, the inlet joint part 213 can be located on the right side of the pump cover 2111, and the outlet joint part 212 can be located on the left side of the pump cover 2111.

[0179] For example, the outer contour size of the inlet joint part 213 can be smaller than the opening size of the first opening 1381, and the inlet joint part 213 is inserted into the first opening 1381 to realize the communication between the inlet end of the pump cavity 230 and the liquid inlet flow channel 131. Similarly, the outer contour of the outlet joint part 212 can also be smaller than the opening size of the second opening 1382, and the outlet joint part 212 is inserted into the second opening 1382 to realize the communication between the outlet end of the pump cavity 230 and the liquid supply flow channel 132.

[0180] The inlet joint part 213 and the outlet joint part 212 can be integrally formed on the body part 211, or the inlet joint part 213 and the outlet joint part 212 can be independently formed and installed on the body part 211.

[0181] In order to improve the sealing between the liquid pump 200 and the motor rear cover 130, a first sealing ring 150 can be sleeved on the outer wall of the inlet joint part 213. Along the axial direction of the motor 100, the first sealing ring 150 abuts between the end face of the body part 211 and the groove bottom of the rear cover groove 138, so as to seal the connection part between the inlet end of the pump cavity 230 and the first opening 1381. Similarly, a second sealing ring 160 can be sleeved on the outer wall of the outlet joint part 212. Along the axial direction of the motor 100, the second sealing ring 160 abuts between the end face of the body part 211 and the groove bottom of the rear cover groove 138, so as to seal the connection part between the outlet end of the pump cavity 230 and the second opening 1382.

[0182] In addition, the connection part between the pump body 2112 and the pump cover 2111 can also be sealed. The end face of the pump body 2112 and the end face of the pump cover 2111 can abut against a third sealing ring 170, and the third sealing ring 170 seals the gap between the pump body 2112 and the pump cover 2111, so as to seal the pump cavity 230 formed in the pump shell 210.

[0183] Figure 7a A structural schematic diagram of the cooling plate 800 provided in the embodiments of the present application is shown in Figure 7b A three-dimensional structural schematic diagram of the cooling plate cooperating with the motor controller is shown in Figure 7a As shown in Figure 7a In the embodiments, the cooling plate 800 for cooling each component of the motor controller 700 can be an integrated structure. As shown in Figure 7b The cooling plate 800 is used to cool the motor controller 700, which has a simple structure, is convenient for the assembly and disassembly of the motor 100 as a whole, and is also convenient for the pipeline design of the heat dissipation system. The production efficiency of the motor 21 can be improved, and the production cost of the motor 21 can be reduced.

[0184] The cooling plate 800 can be made of a metal material, which can improve the structural strength of the cooling plate 800 while ensuring the heat dissipation performance of the cooling plate 800, and meet the reliability requirements of the motor 100 as a whole.

[0185] As shown in Figure 7a The cooling plate 800 includes a main cooling area 810 and a secondary cooling area 820, the main cooling area 810 and the secondary cooling area 820 are in communication, and the secondary cooling area 820 is connected to the circumferential side of the main cooling area 810. For example Figure 7a As shown in Figure 7aAs shown, the shape of the sub-cooling area 820 is curved, of course, the shape of the sub-cooling area 820 can also be other shapes, such as wavy, etc. Therefore, the shape of the main cooling area 810 and the sub-cooling area 820 is not specifically limited here.

[0186] Referring to Figure 7a As shown, the cooling plate 800 has a liquid inlet 830 for the cooling liquid to enter the inside of the cooling plate 800, and a liquid outlet 840 for the cooling liquid in the inside of the cooling plate 800 to flow out. Wherein, the liquid inlet 830 can be arranged in the sub-cooling area 820 or the main cooling area 810, and the liquid outlet 840 can be arranged in the main cooling area 810 or the sub-cooling area 820, the cooling liquid entering the cooling plate 800 through the liquid inlet 830, after flowing through the main cooling area 810 and the sub-cooling area 820, flows out from the liquid outlet 840 of the cooling plate 800.

[0187] The number of main cooling areas 810 and sub-cooling areas 820 is not limited here. For example Figure 7a As shown, the number of main cooling areas 810 and sub-cooling areas 820 is two. For ease of description, the two main cooling areas 810 are defined as a first main cooling area 810A and a second main cooling area 810B, and the two sub-cooling areas 820 are defined as a first sub-cooling area 820A and a second sub-cooling area 820B.

[0188] Specifically, the first main cooling area 810A and the second main cooling area 810B can be arranged separately, for example, the first main cooling area 810A and the second main cooling area 810B are arranged separately along the length direction of the cooling plate 800. The first sub-cooling area 820A and the second sub-cooling area 820B can be connected on the side of the two main cooling areas 810, for example, the first sub-cooling area 820A and the second sub-cooling area 820B are located on the opposite sides of the width direction of the cooling plate 800. For example Figure 7a As shown in the middle, taking the paper surface direction as a reference, the first main cooling area 810A is located on the upper side of the length direction of the cooling plate 800, the second main cooling area 810B is located on the lower side of the length direction of the cooling plate 800, the first sub-cooling area 820A is located on the left side of the width direction of the cooling plate 800, and the second sub-cooling area 820B is located on the right side of the width direction of the cooling plate 800.

[0189] Wherein, 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 provided with two power motor power modules 720, the two power motor power modules 720 are arranged corresponding to the two main cooling areas 810 respectively. For example, the main cooling area 810 can completely cover the surface of the power motor power module 720, and the two power motor power modules 720 are respectively attached in the two main cooling areas 810.

[0190] On this basis, the side surface of the cooling plate 800 for attaching the motor power module 720 can be formed with a receiving groove (not shown in the figure), and at least part of the thickness of the motor power module 720 is located in the receiving groove. For example, the two main cooling areas 810 each have a receiving groove, and the two motor power modules 720 are respectively arranged in the two receiving grooves. In this way, the position of the motor power module 720 on the cooling plate 800 can be positioned. Moreover, the overall height of the motor power module 720 and the cooling plate 800 after assembly can be reduced, and the overall height of the motor 100 can be reduced, which is beneficial to the lightweight design of the electric motor 21.

[0191] As shown in Figure 7b The bus capacitor 710 in the electric controller is attached to the other side surface of the cooling plate 800. When the motor controller 700 is provided with two bus capacitors 710, the two bus capacitors 710 are respectively arranged corresponding to the two main cooling areas 810. As can be seen, the bus capacitor 710 and the motor power module 720 are respectively located on both sides of the main cooling area 810, and the main cooling area 810 is used for heat dissipation of the bus capacitor 710 and the motor power module 720.

[0192] Figure 7b The case where the surface area of the bus capacitor 710 is large is shown in the middle of the figure. The edges of the two bus capacitors 710 respectively extend beyond the two ends of the length direction of the cooling plate 800. That is, the bus capacitor 710 can completely cover the main cooling area 810, and the bus capacitor 710 extends beyond the main cooling area 810. At this time, the side surface of the cooling plate 800 for attaching the bus capacitor 710 can be an overall flat structure, so that the bus capacitor 710 extending out of the cooling plate 800 can be attached to the surface of the cooling plate 800 as much as possible, and the contact area of the bus capacitor 710 and the cooling plate 800 is increased.

[0193] 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 area 810 can completely cover the bus capacitor 710, and the bus capacitor 710 can be completely located in the main cooling area 810. At this time, a receiving groove can also be formed on the side surface of the cooling plate 800 for attaching the bus capacitor 710, and at least part of the thickness of the bus capacitor 710 is located in the receiving groove. For example, the two main cooling areas 810 each have a receiving groove, and the two bus capacitors 710 are respectively arranged in the two receiving grooves. Here, no longer be described.

[0194] The drive motor power module 730 in the electric controller can be arranged corresponding to the sub-cooling area 820 of the cooling plate 800, and the drive motor power module 730 is attached to the sub-cooling area 820. Therefore, along the thickness direction of the cooling plate 800, the drive motor power module 730 is located on one side of the sub-cooling area 820, and the sub-cooling area 820 is used for cooling the drive motor power module 730.

[0195] 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 sub-cooling areas 820. The volume of the drive motor power module 730 is usually small, and the heat generation is also small, the area of the sub-cooling area 820 satisfies the cooling of the drive motor power module 730, and the layout structure inside the motor 100 is more compact.

[0196] In addition, a first heat-conducting layer (not shown in the figure) can be arranged between the drive motor power module 730 and the cooling plate 800, and the heat of the drive motor power module 730 is quickly conducted to the cooling plate 800 through the first heat-conducting layer. Especially when the drive motor power module 730 is attached to the sub-cooling area 820, the flatness of the surface of the sub-cooling area 820 is relatively not high due to the shape structure of the sub-cooling area 820. The first heat-conducting layer can compensate for the surface defects such as pits and protrusions of the sub-cooling area 820, so that the drive motor power module 730 is tightly attached to the sub-cooling area 820, and the cooling effect of the cooling plate 800 on the drive motor power module 730 is improved.

[0197] Similarly, a heat-conducting layer can also be arranged between other components of the motor controller 700 and the cooling plate 800. For example, a second heat-conducting layer is arranged between the bus capacitor 710 and the cooling plate 800, and a third heat-conducting layer is arranged between the motor power module 720 and the cooling plate 800. Here, no longer be described.

[0198] As Figure 7aAs an embodiment, the liquid flow channels in the cooling plate 800 are connected in series in sequence as indicated by the black arrow direction. Taking the inlet end of the first sub-cooling area 820A as the liquid inlet 830 of the cooling plate 800 as an example, the inlet end of the first sub-cooling area 820A can be in communication with the low-temperature liquid outlet 135 of the motor rear cover 130. The outlet end of the first sub-cooling area 820A is in communication with the inlet end of the first main-cooling area 810A, the outlet end of the first main-cooling area 810A is in communication with the inlet end of the second sub-cooling area 820B, the outlet end of the second sub-cooling area 820B is in communication with the inlet end of the second main-cooling area 810B, and the first sub-cooling area 820A, the first main-cooling area 810A, the second sub-cooling area 820B and the second main-cooling area 810B are connected in sequence. The outlet end of the second main-cooling area 810B is the liquid outlet 840 of the cooling plate 800, and the outlet end of the second main-cooling area 810B can be in communication with the inlet end of the liquid flow channel of the stator 110, or the outlet end of the second main-cooling area 810B is in communication with the high-temperature liquid inlet 137 of the motor rear cover 130, or the outlet end of the second main-cooling area 810B is directly in communication with the liquid inlet pipeline 500 connected to the radiator 300.

[0199] At this time, the cooling liquid enters the cooling plate 800 from the inlet end of the first sub-cooling area 820A, and flows in sequence along the first sub-cooling area 820A, the first main-cooling area 810A, the second sub-cooling area 820B and the second main-cooling area 810B, and finally flows out of the cooling plate 800 from the outlet end of the second main-cooling area 810B. In this way, the layout of the liquid cooling flow channel 114 in the cooling plate 800 is simpler, and the design and manufacture of the cooling plate 800 are facilitated. Moreover, when the output power of each component of the motor controller 700 is constant, the required flow rate of the cooling liquid in the cooling plate 800 is smaller.

[0200] It should be noted that, in addition to the flow direction of the cooling liquid on the cooling plate 800 as shown in Figure 7a , in some scenarios, the flow direction of the cooling liquid can also be opposite to the direction shown in Figure 7a . At this time, the second main-cooling area 810B can be in communication with the liquid inlet 830 of the cooling plate 800, and the first sub-cooling area 820A can be in communication with the liquid outlet 840 of the cooling plate 800. The cooling liquid enters the cooling plate 800 from the inlet end of the second main-cooling area 810B, and flows in sequence along the second main-cooling area 810B, the second sub-cooling area 820B, the first main-cooling area 810A and the first sub-cooling area 820A, and finally flows out of the cooling plate 800 from the outlet end of the first sub-cooling area 820A.

[0201] As another embodiment, the liquid flow channels in the cooling plate 800 can also be in parallel (not shown in the figure). Still taking the inlet end of the first sub-cooling area 820A as the liquid inlet of the cooling plate 800 as an example, the inlet end of the first sub-cooling area 820A can be in communication with the low-temperature liquid outlet 135 of the motor rear cover 130. The liquid outlet end of the first sub-cooling area 820A can be divided into two branches, and the outlet ends of the two branches of the first sub-cooling area 820A are in communication with the inlet ends of the first main cooling area 810A and the second main cooling area 810B, respectively. The liquid inlet end of the second sub-cooling area 820B can be divided into two branches, and the inlet ends of the two branches of the second sub-cooling area 820B are in communication with the outlet ends of the first main cooling area 810A and the second main cooling area 810B, respectively. The outlet end of the second sub-cooling area 820B serves as the liquid outlet of the cooling plate 800, and the outlet end of the second sub-cooling area 820B can be in communication with the inlet end of the stator 110, or the outlet end of the second sub-cooling area 820B is in communication with the high-temperature liquid inlet 137 of the motor rear cover 130, or the outlet end of the second sub-cooling area 820B is directly in communication with the liquid inlet pipeline 500 connected to the radiator 300.

[0202] At this time, the cooling liquid enters the cooling plate 800 from the inlet end of the first sub-cooling area 820A, flows along the first sub-cooling area 820A, and enters the first main cooling area 810A and the second main cooling area 810B, respectively. After flowing out of the first main cooling area 810A and the second main cooling area 810B, the cooling liquid converges in the second sub-cooling area 820B and finally flows out of the cooling plate 800 from the outlet end of the second sub-cooling area 820B. In this way, the flow rates of the cooling liquid in the first main cooling area 810A and the second main cooling area 810B are the same, and the cooling conditions of the various regions of the cooling plate 800 are basically equivalent, which is better for the cooling effect of the motor controller 700. Compared with the way in which the liquid flow channels in the cooling plate 800 are connected in series, when the output power of each component of the motor controller 700 is certain, the cooling plate 800 has a higher demand for the flow rate of the cooling liquid, the cooling liquid has a greater force on the cooling plate 800, the sealing strength of the liquid flow channels needs to be increased, and a higher-power driving motor 240 needs to be configured.

[0203] Of course, the liquid flow channels in the cooling plate 800 are in parallel, and the second sub-cooling area 820B is in communication with the liquid inlet 830 of the cooling plate 800, and the first sub-cooling area 820A is in communication with the liquid outlet 840 of the cooling plate 800. At this time, the cooling liquid enters the cooling plate 800 from the inlet end of the second sub-cooling area 820B, flows along the second sub-cooling area 820B, and enters the first main cooling area 810A and the second main cooling area 810B respectively. After the cooling liquid flows out of the first main cooling area 810A and the second main cooling area 810B, it converges in the first sub-cooling area 820A and finally flows out of the cooling plate 800 from the outlet end of the first sub-cooling area 820A. Here, no longer.

[0204] In the cooling plate 800, the main cooling area 810 occupies the main part of the cooling plate 800, the space of the liquid flow channel in the main cooling area 810 is larger, and the liquid flow channel formed in the main cooling area 810 can be defined as a cooling cavity. For example, the first main cooling area 810A has a first cooling cavity 811, and the second main cooling area 810B has a second cooling cavity 812. The sub-cooling area 820 occupies the edge part of the cooling plate 800, the space of the liquid flow channel in the sub-cooling area 820 is smaller, and the liquid flow channel formed in the sub-cooling area 820 can be defined as a cooling pipe. For example, the first sub-cooling area 820A has a first cooling pipe 821, and the second sub-cooling area 820B has a second cooling pipe 822.

[0205] Figure 8 A planar structure schematic diagram of the stator 110 provided by the embodiment of the present application is shown in Figure 9 A partial structure schematic diagram of the power motor 100 provided by the embodiment of the present application is shown in

[0206] Combined with Figure 8 and Figure 9 As shown, the stator 110 can include a stator frame body, a stator core assembly 119, and a stator winding 112. The stator frame body serves as the basic support component of the stator 110 as a whole, and can be annular. The stator frame body can be provided as a hollow structure, which facilitates the assembly of the stator 110 and the rotor 120, and also reduces the weight of the stator 110. The stator core assembly 119 is fixedly connected with the stator frame body, and the stator winding 112 is installed on the stator core assembly 119.

[0207] The liquid flow channel arranged in the stator 110 can be referred to as a liquid cooling flow channel 114, and the stator winding 112 is located inside the liquid cooling flow channel 114 to dissipate heat from the stator winding 112. The liquid cooling flow channel 114 can include a flow equalization channel 116 and a liquid cooling cavity 115, and the outlet end of the flow equalization channel 116 is in communication with the inlet end of the liquid cooling cavity 115. As shown, the stator frame body includes a stator support 111 and a support assembly 113, the support assembly 113 is sleeved on the outer periphery of the stator support 111 and is fixedly connected with the stator support 111, and a stator core assembly 119 is located outside the stator support 111 and between the support assembly 113 and the stator support 111. At this time, the flow equalization channel 116 can be formed in the stator support 111, the support assembly 113 and the stator support 111 can surround the liquid cooling cavity 115, the stator winding 112 is located inside the liquid cooling cavity 115, and the stator winding 112 is uniformly arranged, for example, along the circumference of the liquid cooling cavity 115. The cooling liquid enters the stator support 111 from the inlet end of the flow equalization channel 116, flows along the flow equalization channel 116 formed in the stator support 111, and flows into the liquid cooling cavity 115 from the outlet end of the flow equalization channel 116 to cool the stator winding 112 in the liquid cooling cavity 115.

[0208] It should be noted that in addition to being surrounded by the support assembly 113 and the stator support 111, in some embodiments, the stator frame body is the stator support 111, at this time, the liquid cooling cavity 115 and the flow equalization channel 116 are both arranged on the stator support 111, and the liquid cooling cavity 115 can be understood as a cavity formed by hollowing out the stator support 111.

[0209] By integrating the flow equalization channel 116 in the stator frame body, there is no need to additionally 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 motor 100. Moreover, the flow equalization channel 116 can form a protruding reinforcing structure on the stator frame body, which can enhance the structural strength of the stator frame body and improve the performance of the motor 100, such as tensile, torque resistance, and overturning torque resistance. In addition, using the structure of the stator frame body to design the flow equalization channel 116 also facilitates the distribution and flow equalization of the cooling liquid in the stator 110, which is beneficial to improving the cooling effect of the stator 110.

[0210] As mentioned above, when the cooling plate 800 and the stator 110 are connected in series, the inlet end of the flow equalization channel 116 in the stator 110 can be in communication with the outlet end of the liquid flow channel in the cooling plate 800, and the outlet end of the liquid cooling cavity 115 in the stator 110 can be in communication with the liquid outlet channel 133 on the motor rear cover 130. At this time, the cooling liquid flows into the liquid flow channel of the cooling plate 800 from the low-temperature liquid outlet 135 on the motor rear cover 130 after flowing through the liquid supply channel 132 in the motor rear cover 130, circulates in the cooling plate 800, and then flows out from the outlet end of the cooling plate 800. Then, the cooling liquid enters the stator 110 from the inlet end of the flow equalization channel 116 of the stator 110, enters the liquid cooling cavity 115 from the flow equalization channel 116, and then flows out from the outlet end of the liquid cooling cavity 115 of the stator 110. Subsequently, the cooling liquid flows into the liquid outlet channel 133 in the motor rear cover 130 from 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.

[0211] Of course, the stator 110 can also be connected in parallel with the cooling plate 800. The inlet end of the flow equalization channel 116 in the stator 110 and the inlet end of the liquid flow channel in the cooling plate 800 are both in communication with 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 flow channel in the cooling plate 800 are both in communication with the liquid outlet channel 133 in the motor rear cover 130. At this time, the cooling liquid flows out from the low-temperature liquid outlet 135 on the motor rear cover 130 after flowing through the liquid supply channel 132 in the motor rear cover 130, and then divides 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 equalization channel 116. The cooling liquid in the stator 110 enters the liquid cooling cavity 115 from the flow equalization channel 116, and then flows out from the outlet end of the liquid cooling cavity 115 of the stator 110. The cooling liquid that flows out of the stator 110 and the cooling liquid that flows out of the cooling plate 800 are combined, and then flow into the liquid outlet channel 133 in the motor rear cover 130 from the high-temperature liquid inlet 137 on the motor rear cover 130. The cycle continues as the cooling liquid flows into the radiator 300 from the motor rear cover 130.

[0212] The flow equalization channel 116 arranged in the stator frame body 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 equalization channel 116 can be uniformly and evenly arranged along the circumference of the stator frame body. Each outlet end of the flow equalization channel 116 is in communication with the inside of the liquid cooling cavity 115. In this way, the cooling liquid that enters the flow equalization channel 116 from the inlet end of the flow equalization channel 116 can be distributed to each outlet end of the flow equalization channel 116 at a relatively uniform flow rate. The flow rate of the cooling liquid that flows into the liquid cooling cavity 115 from each outlet end of the flow equalization channel 116 is within a predetermined range, or the flow rate of the cooling liquid that flows into the liquid cooling cavity 115 from each outlet end of the flow equalization channel 116 is uniform.

[0213] With such an arrangement, the coolant in the equalizing flow channel 116 can be diverted from its multiple outlet ends and simultaneously flow into various areas in the circumferential direction of the liquid cooling chamber 115. In this way, the coolant can cool various areas in the circumferential direction of the liquid cooling chamber 115 at the same time, and the temperature of the coolant in various areas in the circumferential direction of the liquid cooling chamber 115 is basically consistent, which can improve the cooling uniformity of the coolant on each stator winding 112. In addition, the flow rate of the coolant flowing out of each outlet end of the equalizing flow channel 116 can also be basically consistent, so that the flow rate of the coolant allocated to each stator winding 112 is basically consistent, and the cooling efficiency of the coolant on each stator winding 112 is basically the same. As a result, the cooling uniformity of the coolant on the stator 110 is improved, and the cooling efficiency and cooling effect of the stator 110 are higher.

[0214] Specifically, such as Figure 8 As shown, the flow-distributing channel 116 disposed within the stator frame may include an annular channel 1161 and a plurality of diverter channels 1162. Each diverter channel 1162 surrounds the outer circumference of the annular channel 1161 and may be spaced apart along the circumference of the annular channel 1161. One end of each diverter channel 1162 communicates with the annular channel 1161, and this end may serve as the inlet end of the diverter channel 1162. The other end of each diverter channel 1162 communicates with a different circumferential portion of the liquid-cooling chamber 115, and this end may serve as the outlet end of the diverter channel 1162 (i.e., each outlet end of the aforementioned flow-distributing channel 116).

[0215] The annular flow channel 1161 is equivalent to the liquid inlet flow channel of the stator 110, and the inlet end of the stator 110 can be connected to the annular flow channel 1161. For example, a liquid inlet 1163 is provided on the annular flow channel 1161, and the liquid inlet 1163 can be located at any position on the circumference of the annular flow channel 1161. The liquid inlet 1163 of the annular flow channel 1161 can be connected to the outlet end of the cooling plate 800 (or the low-temperature liquid outlet 135 of the motor rear cover 130), and the coolant enters the stator 110 from the liquid inlet 1163 of the annular flow channel 1161. After the coolant enters the annular flow channel 1161 from the liquid inlet 1163, it flows along the annular flow channel 1161 and is divided into each branch flow channel 1162. The coolant in each branch flow channel 1162 then flows into the liquid cooling chamber 115.

[0216] Each of the sub-flow channels 1162 can extend along the radial direction of the annular flow channel 1161, and each of the sub-flow channels 1162 is uniformly spaced along the circumferential direction of the annular flow channel 1161. That is, along the circumferential direction of the annular flow channel 1161, the included angle between each adjacent two sub-flow channels 1162 is the same. In this way, the sub-flow channels 1162 are uniformly spaced along the circumferential direction of the annular flow channel 1161, and the flow rate of the cooling liquid flowing from the annular flow channel 1161 into each of the sub-flow channels 1162 can be kept consistent. Moreover, the cooling liquid flowing out of each of the sub-flow channels 1162 is uniformly distributed to each region along the circumferential direction of the liquid cooling cavity 115, so as to improve the uniformity of cooling each of the stator windings 112.

[0217] For example, as shown in FIG. 11, the flow equalization channel 116 includes four sub-flow channels 1162, each of which extends along the radial direction of the annular flow channel 1161, and each of which is uniformly spaced along the circumferential direction of the annular flow channel 1161. Figure 8 In this case, among the four sub-flow channels 1162, each two of the sub-flow channels 1162 are opposite to each other, and the opposite two sub-flow channels 1162 are located on the same radial line of the annular flow channel 1161, and the four sub-flow channels 1162 are arranged in a “cross” shape.

[0218] Of course, in other examples, the flow equalization channel 116 can also include five, six, seven, eight or even more sub-flow channels 1162, each of which can extend along the radial direction of the annular flow channel 1161, and each of which can be uniformly spaced along the circumferential direction of the annular flow channel 1161. The present embodiment is not limited in this regard.

[0219] For example, as shown in FIG. 11, the flow equalization channel 116 includes four sub-flow channels 1162, each of which extends along the radial direction of the annular flow channel 1161, and each of which is uniformly spaced along the circumferential direction of the annular flow channel 1161. Figure 8 and Figure 9 In some embodiments, the liquid flow channel arranged in the stator 110 can also include a winding flow channel 117, that is, the liquid cooling flow channel 114 can also include the 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 can be annular, the center of the circle surrounded by the winding flow channel 117 can 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 can be greater than the diameter of the circle surrounded by the annular flow channel 1161. Each of the sub-flow channels 1162 is connected between the annular flow channel 1161 and the winding flow channel 117, the inlet end of the sub-flow channel 1162 communicates with the annular flow channel 1161, and the outlet end of the sub-flow channel 1162 communicates with the inlet end of the winding flow channel 117. When the center of the circle surrounded by the winding flow channel 117 coincides with the center of the circle surrounded by the annular flow channel 1161, the extension direction of the sub-flow channel 1162 can also be the radial direction of the winding flow channel 117.

[0220] At this time, a plurality of winding liquid inlets 118 can be arranged between the winding flow channel 117 and the liquid cooling cavity 115, and the winding flow channel 117 and the liquid cooling cavity 115 are communicated through the winding liquid inlets 118. The communication 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 cavity 115. In this way, on the basis of uniformly distributing the cooling liquid to each area of the liquid cooling cavity 115 through each sub-flow channel 1162, a plurality of winding liquid inlets 118 can be correspondingly arranged in each area of the liquid cooling cavity 115, and the cooling liquid in each partial area of the liquid cooling cavity 115 is further uniformly distributed through the winding liquid inlets 118. Thus, the uniformity of the cooling liquid flow in each part of the liquid cooling cavity 115 is further improved, and the liquid cooling consistency of each part in the liquid cooling cavity 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 motor 100 is further improved.

[0221] In some embodiments, the winding flow channel 117 and the winding liquid inlet 118 can be arranged on the stator support 111. In other embodiments, the stator support 111 and the support assembly 113 can jointly form the winding flow channel 117 and the winding liquid inlet 118. In yet other embodiments, the stator support 111, the stator core assembly 119, and the support assembly 113 can jointly form the winding flow channel 117 and the winding liquid inlet 118.

[0222] In other examples, the liquid flow channel arranged in the stator 110 can also not include the winding flow channel 117, but directly communicate with the inlet end of the liquid cooling cavity 115 through the outlet end of the sub-flow channel 1162. For example, the number of sub-flow channels 1162 arranged in the flow channel 116 is large, and each sub-flow channel 1162 can form a plurality of uniformly distributed inlet ends in the liquid cooling cavity 115. The consistency of the flow and temperature of the cooling liquid in each area of the liquid cooling cavity 115 is very high. At this time, only by communicating each sub-flow channel 1162 with the liquid cooling cavity 115, a high consistency cooling effect on each stator winding 112 can be ensured.

[0223] Taking the liquid flow channel arranged in the stator 110 as an example, as an example, the winding flow channel 117 can be arranged as an integral circular flow channel, that is, the number of winding flow channels 117 is one. At this time, each sub-flow channel 1162 communicates with 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 winding flow channels 117 can be multiple, and each winding flow channel 117 is arranged along the circumference of the motor 100. At this time, each winding flow channel 117 should be communicated with at least one sub-flow channel 1162, so that the cooling liquid can flow into each winding flow channel 117.

[0224] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric motor (21), characterized in that include: A power motor (100), wherein a receiving cavity (140) is provided in the power motor (100); a motor controller (700), the motor controller (700) being used to control the power motor (100), the motor controller (700) being located inside the accommodating cavity (140), and the motor controller (700) comprising a bus capacitor (710) and a power module; A cooling plate (800) is located inside the accommodating cavity (140), and the cooling plate (800) is used to perform liquid cooling on the bus capacitor (710) and the power module.

2. The electric motor (21) according to claim 1, characterized in that The cooling plate (800) comprises: Liquid inlet (830); Liquid outlet(840); Main cooling zone (810); The auxiliary cooling zone (820) is connected to the peripheral side of the main cooling zone (810) and communicates with the main cooling zone (810) so that the coolant flowing into 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).

3. The electric motor (21) according to claim 2, characterized in that The number of the main cooling zone (810) and the number of the auxiliary cooling zone (820) are both two, the main cooling zone (810) includes a first main cooling zone (810A) and a second main cooling zone (810B), and the first main cooling zone (810A) and the second main cooling zone (810B) are separated and arranged; the auxiliary cooling zone includes a first auxiliary cooling zone (820A) and a second auxiliary cooling zone (820B), and the first auxiliary cooling zone (820A) and the second auxiliary cooling zone (820B) are respectively arranged on both sides of the main cooling zone (810); wherein: 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 sequentially connected in series, one of the first auxiliary cooling zone (820A) and the second main cooling zone (810B) is connected to the liquid inlet (830), and the other is connected to the liquid outlet (840); or The first main cooling zone (810A) and the second main cooling zone (810B) are connected in parallel through the first auxiliary cooling zone (820A) and the second auxiliary cooling zone (820B); one of the first auxiliary cooling zone (820A) and the second auxiliary cooling zone (820B) is connected to the liquid inlet (830), and the other is connected to the liquid outlet (840).

4. The electric motor (21) according to claim 3, characterized in that The first auxiliary cooling zone (820A) includes a first cooling pipe (821), the second auxiliary cooling zone (820B) includes a second cooling pipe (822), the first main cooling zone (810A) includes a first cooling cavity (811), and the second main cooling zone (810B) includes a second cooling cavity (812).

5. The electric motor (21) according to any one of claims 2 to 4, characterized in that The power module includes a power motor power module (720) and a drive motor power module (730); The bus capacitor (710) and the power motor power module (720) are located in the main cooling zone (810), and the drive motor power module (730) is located in the auxiliary cooling zone (820). The main cooling zone (810) is used to dissipate heat for the power motor power module (720) and the bus capacitor (710), and the auxiliary cooling zone (820) is used to dissipate heat for the drive motor power module (730).

6. The electric motor (21) according to claim 5, characterized in that The cooling plate (800) has a receiving groove, and at least a portion of the power motor power module (720) is located inside the receiving groove; and / or, The motor controller (700) further comprises a first heat-conducting layer, wherein the first heat-conducting layer is arranged between the drive motor power module (730) and the cooling plate (800); and / or, The motor controller (700) further comprises a second heat-conducting layer, the second heat-conducting layer being arranged between the bus capacitor (710) and the cooling plate (800); and / or, The power module further includes a variable pitch motor power module; and / or, The power module also includes a fan motor power module.

7. The electric generator (21) according to any one of claims 1 to 4, characterized in that The power motor (100) comprises a stator (110) and a motor rear cover (130), wherein the motor rear cover (130) is connected to the stator (110) and forms the accommodating cavity (140) with the stator (110); wherein the motor rear cover (130) is provided with a liquid inlet channel (131) and a liquid supply channel (132); The electric engine (21) further includes a liquid pump (200), wherein the liquid pump (200) is connected to the liquid inlet channel (131) and the liquid supply channel (132); The liquid inlet (830) of the cooling plate (800) is connected to the outlet end of the liquid supply channel (132), and the liquid pump (200) is used to allow the cooling liquid to flow through the liquid inlet channel (131), the liquid supply channel (132) and the cooling plate (800) in sequence.

8. The electric motor (21) 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 (21) 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 (21) according to claim 9, characterized in that The liquid pump (200) comprises a pump housing (210) and a pump rotor (220), wherein the pump housing (210) has a pump cavity (230), and the pump rotor (220) is disposed in the pump cavity (230); The pump housing (210) includes a pump cover (2111) and a pump body (2112), wherein the pump cover (2111) and the pump body (2112) enclose the pump chamber (230), and at least a portion of the pump body (2112) is located outside the rear cover groove (138) and is fixedly connected to the motor rear cover (130); an inlet joint portion (213) and an outlet joint portion (212) are provided on the pump cover (2111); the inlet joint portion (213) is inserted into the first opening (1381) to enable the pump chamber (230) to communicate with the liquid inlet channel (131); and the outlet joint portion (212) is inserted into the second opening (1382) to enable the pump chamber (230) to communicate with the liquid supply channel (132).

11. The electric motor (21) according to claim 10, characterized in that The electric engine (21) further comprises: a first sealing ring (150), the first sealing ring (150) being sleeved on the outer wall of the inlet joint portion (213) and respectively abutting against the pump cover (2111) and the bottom of the rear cover groove (138) along the axial direction of the power motor (100); and / or, The second sealing ring (160) is sleeved on the outer wall of the outlet joint portion (212) and abuts against the pump cover (2111) and the bottom of the rear cover groove (138) along the axial direction of the power motor (100).

12. The electric motor (21) according to claim 7, characterized in that The liquid pump (200) comprises a pump body (2112) and a pump rotor (220); the pump body (2112) and the motor rear cover (130) enclose a pump cavity (230); and the pump rotor (220) is disposed in the pump cavity (230).

13. The electric motor (21) according to claim 12, characterized in that The motor rear cover (130) has a rear cover groove (138), and the pump body (2112) and the rear cover groove (138) enclose the pump chamber (230).

14. The electric motor (21) according to claim 7, characterized in that The stator (110) comprises a stator frame and a stator winding (112); a liquid cooling cavity (115) and a flow balancing channel (116) are provided on the stator frame; and the stator winding (112) is located inside the liquid cooling cavity (115); The inlet end of the flow balancing channel (116) is connected to the liquid outlet (840) of the cooling plate (800), or the inlet end of the flow balancing channel (116) is connected to the outlet end of the liquid supply channel (132); the flow balancing channel (116) has a plurality of outlet ends arranged at intervals along the circumference of the stator frame, and each outlet end of the flow balancing channel (116) is connected to the liquid cooling cavity (115).

15. The electric motor (21) according to claim 14, characterized in that The electric motor (21) further comprises a radiator (300), wherein the radiator (300) is fixedly connected to the motor rear cover (130), and an outlet end of the radiator (300) is in communication with the liquid inlet channel (131); The motor rear cover (130) is further provided with a liquid outlet channel (133), the inlet end of the liquid outlet channel (133) is connected to the outlet end of the liquid cooling chamber (115), or the outlet end of the liquid cooling chamber (115) and the liquid outlet (840) of the cooling plate (800) are both connected to the inlet end of the liquid outlet channel (133), and the outlet end of the liquid outlet channel (133) is connected to the inlet end of the radiator (300).

16. The electric motor (21) according to claim 15, characterized in that The electric engine (21) further comprises a fan (400), wherein the fan (400) is located between the radiator (300) and the power motor (100) along the axial direction of the power motor (100), and the fan (400) is used to dissipate heat from the radiator (300), wherein: The liquid pump (200) comprises a drive motor (240), a first output end of the drive motor (240) is in transmission connection with the fan (400), a second output end of the drive motor (240) is in transmission connection with a pump rotor (220) inside the liquid pump (200), and the drive motor (240) serves as a pump motor of the liquid pump (200) and is used to drive the fan (400) to rotate; or, The electric engine (21) further comprises a fan motor, wherein the fan motor is fixedly connected to the motor rear cover (130), the fan motor is transmission-connected to the fan (400), and the fan motor is used to drive the fan (400) to rotate.

17. An electric propulsion device (20), characterized in that The invention comprises a propeller (22) and an electric engine (21) according to any one of claims 1 to 16, wherein the propeller (22) is transmission-connected to a power motor (100) of the electric engine (21), and the power motor (100) is used to drive the propeller (22) to rotate.

18. 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 17, wherein the electric propulsion device (20) is arranged on the fuselage (11) and / or the wings (12) and / or the tail wing (13).

Images