Winding-immersed liquid-cooled electric motor, power assembly, and vehicle

Abstract

The present application relates to the technical field of electric motors, and particularly relates to a winding-immersed liquid-cooled electric motor, a power assembly, and a vehicle. The electric motor comprises a stator core, a stator winding, an annular cover plate and an injection-molded part formed by means of integrated injection molding, wherein a plurality of winding slots of the stator core are configured to fix the injection-molded part and the stator winding, and the injection molded part comprises a plurality of embedded sections and an exposed section. Each embedded section is embedded into one winding slot in the axial direction of the electric motor; the exposed section covers an axial end face of the stator core, and comprises an annular boss; one end of the stator winding passes through the exposed section in the axial direction of the electric motor and surrounds the annular boss in the circumferential direction of the electric motor; and the annular boss is configured to enclose the annular cover plate to form an accommodating cavity, which is configured to accommodate the end of the stator winding immersed in a coolant. In the electric motor, the accommodating cavity, in which an end winding can be immersed, is defined at an end portion of a stator, thereby enhancing the cooling effect on the stator winding and thus improving the power of the electric motor.

Description

A liquid-cooled motor with immersed windings, powertrain and vehicle

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411589850.X, filed on November 7, 2024, entitled “A motor, powertrain and vehicle with winding immersion liquid cooling”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of motor technology, and more particularly to a motor, powertrain, and vehicle with windings immersed in liquid cooling. Background Technology

[0004] The losses in the stator windings of a motor are a significant source of heat and affect motor efficiency. Circulating oil or water through the stator can lower the winding temperature, thereby reducing heat loss and improving motor efficiency.

[0005] However, current motor cooling methods cannot meet the demands of motor miniaturization and high continuous power requirements. Summary of the Invention

[0006] This application provides a motor, powertrain, and vehicle with winding immersion liquid cooling. The motor is formed by injection molding the stator core and injection molded parts to create a structure that allows direct immersion cooling of the windings, which can enhance the cooling effect of the motor and meet the power requirements of the motor.

[0007] In a first aspect, embodiments of this application provide a motor with a winding immersed in liquid cooling. The motor includes a stator core, stator windings, an annular cover plate, and an integrally injection-molded part. The stator core includes a central hole and multiple winding slots. Each winding slot and the central hole penetrate two axial end faces of the stator core along the motor's axial direction. The multiple winding slots are arranged at intervals along the motor's circumference. The multiple winding slots are used to fix the injection-molded part and the stator windings. The injection-molded part includes multiple embedded sections and one exposed section. In the manufacturing of the motor, the injection-molded part can be fixed to the stator core by an injection molding process. Each embedded section of the injection-molded part is embedded in a winding slot along the motor's axial direction. The exposed section covers the axial end face of the stator core and includes an annular boss. The orientation of the annular boss is away from the axial end face of the stator core along the motor's axial direction. The inner diameter of the annular boss is greater than or equal to the inner diameter of the central hole. An annular boss surrounds the central hole and does not extend into the central hole radially along the motor, thus not affecting rotor installation. One end of the stator winding passes through the exposed section axially along the motor and surrounds the annular boss circumferentially along the motor. The annular boss encloses an annular cover plate to form a receiving cavity for accommodating coolant that submerges the aforementioned end of the stator winding.

[0008] The motor provided in this application embodiment uses an annular cover plate in conjunction with an exposed section of the injection-molded part to form a receiving cavity. The portion of the stator winding extending beyond this exposed section can extend into the receiving cavity. Coolant is filled into the receiving cavity, providing immersion cooling of the portion of the stator winding housed within the cavity, thus achieving direct cooling of the end winding of the electronic winding. This annular boss acts as a barrier between the stator winding and the central hole, reducing the creepage distance between the central hole of the stator core and the stator winding along the motor axial direction. This shortens the end height of the stator winding, facilitating motor miniaturization. Compared to the existing oil-injection ring end winding cooling scheme, this method has a simpler structure, better cooling effect, reduced production costs, and increased continuous power of the motor.

[0009] In one embodiment, the annular cover plate includes an annular flange. After the annular cover plate surrounds the annular boss, the annular flange is arranged radially between the annular boss and one end of the stator winding. During the assembly of the annular cover plate and the injection-molded part, the annular flange and the annular boss can be positioned and fixed along the axial direction of the motor, improving installation convenience. The radial arrangement of the annular boss and the annular flange along the motor can also increase the contact area between the annular cover plate and the exposed section, enhancing the fixing and sealing effect.

[0010] In one embodiment, along the motor axis, the length of the stator winding passing through an exposed section is greater than the length of the annular boss but less than the length of the annular flange. The stator winding routing is not affected by the annular boss, and the annular cover plate will not contact the ends of the stator winding, thus not affecting the function of the stator winding.

[0011] In one embodiment, the inner diameter of the annular flange is larger than the outer diameter of the annular boss along the radial direction of the motor. The gap between the annular flange and the exposed section is used to fill with a sealing material. This sealing material may include materials such as sealant, and the addition of sealing material ensures a secure and sealed connection between the annular cover and the exposed section.

[0012] In one embodiment, the annular cover includes one or more outlets for discharging coolant from a receiving cavity. The distance between each outlet and the axis of the annular cover along the radial direction of the motor is greater than the outer diameter of the annular flange. The axis of the annular cover is also the axis of the motor, and the outlets avoid the annular flange.

[0013] In one embodiment, the above-mentioned one or more outlets penetrate the annular cover plate along the axial direction of the motor, enabling the coolant to be discharged along the axial direction of the motor.

[0014] In one embodiment, the exposed section further includes another annular boss, and an annular cover plate is used to enclose the other annular boss. The other annular boss surrounds the first annular boss circumferentially around the first annular boss, and an annular groove is formed between the first and second annular bosses. The opening of the annular groove faces away from an axial end face along the axial direction of the motor. Specifically, along the radial direction of the motor, the outer diameter of the other annular boss is less than or equal to the outer diameter of the stator core, and the inner diameter of the other annular boss is greater than or equal to the length of each winding slot. The exposed section is equivalent to including two annular bosses. When the annular cover plate mates with the exposed section, the two annular bosses can be more precisely installed and positioned with the annular cover plate, achieving a more stable fixing effect and improving the sealing of the receiving cavity.

[0015] In one embodiment, the annular cover plate includes another annular flange. After the annular cover plate surrounds another annular boss, the other annular flange is arranged radially along the motor between the other annular boss and one end of the stator winding. The gap between the other annular flange and an exposed section is used to fill sealing material. During the assembly of the annular cover plate and the injection molded part, the other annular flange and the other annular boss can be positioned and fixed along the axial direction of the motor, improving installation convenience, increasing the contact area between the annular cover plate and the exposed section, and enhancing the fixing and sealing effect.

[0016] In one embodiment, along the motor's axial direction, the length of one annular boss is greater than the length of another annular boss but less than the length of the portion of the stator winding that passes through an exposed section. This one annular boss also serves to ensure creepage distance and needs to maintain a certain length along the motor's axial direction. The other annular boss primarily serves to mate with an annular cover plate; therefore, the length of the other annular boss along the motor's axial direction can be less than that of the first annular boss.

[0017] In one embodiment, the motor includes multiple axial flow channels, each for transporting coolant to cool the stator windings embedded in corresponding winding slots. The motor also includes multiple radial flow channels, each communicating radially with one of the axial flow channels. The axial flow channels of the motor can directly cool the stator windings housed in the winding slots, further improving the cooling effect.

[0018] In one embodiment, the stator winding includes multiple flat wires, each embedded segment forming an axial flow channel. Multiple flat wires in each winding slot are arranged radially within the axial flow channel. Each axial channel is used to deliver coolant to directly cool the multiple flat wires in the embedded winding slot. Each embedded segment can form an axial flow channel, and cooling within the axial flow channel can also immerse the multiple flat wires in each winding slot for cooling.

[0019] In one embodiment, each axial flow channel connects to at least one radial flow channel in a receiving cavity or stator core, and each radial flow channel receives coolant through an internal flow channel in the motor housing. The outer diameter of an exposed section along the radial direction of the motor is greater than the length of each winding slot. An exposed section includes multiple through-holes, each through-hole extending axially through the exposed section. One end of the stator winding received by each winding slot passes through a through-hole, and each axial flow channel connects to the receiving cavity through a through-hole.

[0020] In one embodiment, along the radial direction of the motor, the outer diameter of each embedded segment is less than or equal to the outer diameter of an exposed segment. This exposed segment can be more tightly bonded and fixed to the stator core.

[0021] In one embodiment, the motor housing includes a motor end cover and a stator sleeve. The stator sleeve is used to accommodate and fix the stator core. The motor end cover is used to enclose the stator sleeve and includes an annular cover plate. After the motor end cover encloses the stator sleeve, the annular cover plate and the exposed section together form the aforementioned receiving cavity. In this structure, the annular cover plate is equivalent to a part of the motor housing, which simplifies the motor structure.

[0022] Secondly, embodiments of this application provide a powertrain that includes a reducer or a transmission and any of the motors provided in the first aspect above, wherein the output shaft of the motor is coaxially connected to the input shaft of the reducer or the transmission.

[0023] Thirdly, embodiments of this application provide a vehicle including wheels, a transmission mechanism, and a powertrain as described in the second aspect above. The powertrain drives the wheels through the transmission mechanism. This vehicle can be an electric vehicle or a hybrid vehicle. The application of the aforementioned powertrain helps ensure the smooth and safe operation of the vehicle. Attached Figure Description

[0024] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application;

[0025] Figure 2 is a structural schematic diagram of a powertrain provided in an embodiment of this application;

[0026] Figure 3a is a partial structural schematic diagram of a motor provided in an embodiment of this application;

[0027] Figure 3b is a partial structural schematic diagram of a motor provided in an embodiment of this application;

[0028] Figure 3c is an exploded view of a partial structure of an electric motor provided in an embodiment of this application;

[0029] Figure 4 is a partial cross-sectional view of a motor provided in an embodiment of this application;

[0030] Figure 5 is a schematic diagram of the structure of a stator core of an electric motor provided in an embodiment of this application;

[0031] Figure 6a is a schematic diagram of the structure of an injection-molded motor according to an embodiment of this application;

[0032] Figure 6b is a partial cross-sectional view of the injection molded part of an electric motor and the winding slot provided in an embodiment of this application;

[0033] Figure 7a is a schematic diagram of the structure of the injection molded part of the motor and the stator core according to an embodiment of this application;

[0034] Figure 7b is a magnified view of the details at point V1 in Figure 7a;

[0035] Figure 8a is a partial cross-sectional view of the structure of the injection molded part of the motor and the stator core provided in an embodiment of this application;

[0036] Figure 8b is a partial cross-sectional view of the structure of the injection molded part of the motor and the stator core provided in an embodiment of this application;

[0037] Figure 9 is a schematic diagram of the stator structure of an electric motor provided in an embodiment of this application;

[0038] Figure 10 is a partial cross-sectional view of the stator of an electric motor provided in an embodiment of this application;

[0039] Figure 11a is a partial cross-sectional view of the stator of an electric motor provided in an embodiment of this application;

[0040] Figure 11b is a simplified cross-sectional view of a stator of an electric motor according to an embodiment of this application;

[0041] Figure 12a is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0042] Figure 12b is a magnified view of the details at V2 in Figure 12a;

[0043] Figure 13a is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0044] Figure 13b is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0045] Figure 13c is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0046] Figure 14a is a partial cross-sectional structural diagram of an electric motor provided in an embodiment of this application;

[0047] Figure 14b is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0048] Figure 15a is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0049] Figure 15b is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0050] Figure 15c is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0051] Figure 15d is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0052] Figure 16a is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0053] Figure 16b is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0054] Figure 17 is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0055] Figure 18 is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0056] Figure 19 is a structural schematic diagram of an injection-molded part of an electric motor provided in an embodiment of this application;

[0057] Figure 20a is an exploded view of the stator core of an electric motor provided in an embodiment of this application;

[0058] Figure 20b is a partial structural diagram of two first stator laminations of an electric motor provided in an embodiment of this application;

[0059] Figure 20c is a partial structural diagram of two first stator laminations of an electric motor provided in an embodiment of this application;

[0060] Figure 20d is a partial structural diagram of the stator core of an electric motor provided in an embodiment of this application;

[0061] Figure 20e is a partial structural diagram of the stator core of an electric motor provided in an embodiment of this application;

[0062] Figure 21 is a partial structural diagram of a motor stator core and an injection molded part provided in an embodiment of this application;

[0063] Figure 22 is a schematic diagram of the liquid cooling principle of an electric motor provided in an embodiment of this application;

[0064] Figure 23 is a partial cross-sectional view of the injection molded part of an electric motor and the winding slot provided in an embodiment of this application;

[0065] Figure 24a is a partial cross-sectional structural diagram of an electric motor provided in an embodiment of this application;

[0066] Figure 24b is a partial cross-sectional structural diagram of a motor provided in an embodiment of this application;

[0067] Figure 24c is a partial cross-sectional structural diagram of an electric motor provided in an embodiment of this application.

[0068] Reference numerals: 1000-Powertrain; 2000-Transmission mechanism; 3000-Wheel; 100-Motor; 200-Motor controller; 300-Reducer; 10-Stator; 20-Annular cover plate; 201-First annular flange; 202-Base plate; 203-Second annular flange; 1-Stator core; 11-Center hole; 12-Winding slot; 121-Opening; 101, 101a, 101b-First stator laminations; 1011, 1011a, 1011b, 1011m, 1011n-First central through hole; 1012-First groove; 1013, 1013a, 1013b, 1013m, 1013n-Connecting hole; 1014, 1014a, 1014b, 1014m, 1014n-Axial through hole; 1015, 1015a, 1015b, 1015m, 1015n-Second groove; 102-Second stator lamination; 1021-Second central through hole; 1022-Third groove; 1023-Guide hole; 2-Stator winding; 21-Flat wire; 3-Injection molded part; 31-Embedded section; 32-Exposed section; 321-First annular boss; 322-Second annular boss; 33-Connecting section; 41-Motor end cover; 42-Stator sleeve; J-Beveled surface; K-Liquid outlet; M-Sealing material; S-Receiving cavity; d-Axial end face; g-Through hole; p-Through hole; t1-Axial liquid cooling channel; t2-Circumferential liquid cooling channel; q1-Axial flow channel; q2-Radial flow channel; w-Notch. Detailed Implementation

[0069] In recent years, electric vehicles have become increasingly popular with users due to their advantages such as low pollution, low noise, and high energy efficiency, and their market share has been increasing year by year. The stator windings of the drive motor, when energized with three-phase electricity, generate a rotating magnetic field, which interacts with the rotor magnetic field to produce torque, thus driving the electric vehicle. Currently, the cooling method for the flat wire windings of flat wire motors cannot meet the efficiency requirements of the motor.

[0070] Based on this, embodiments of this application provide a motor, powertrain, and vehicle with windings immersed in liquid cooling, wherein the stator windings of the motor can be better cooled, thereby improving the efficiency of the motor.

[0071] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0072] Figure 1 is a structural schematic diagram of a vehicle provided in an embodiment of this application. As shown in Figure 1, the vehicle is a wheeled device driven or towed by a power unit. Specifically, it can be a pure electric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), or a plug-in hybrid electric vehicle (PHEV), etc. The vehicle includes a powertrain 1000, a transmission mechanism 2000, and wheels 3000. The powertrain 1000 drives the wheels 3000 through the transmission mechanism 2000. The powertrain 1000 converts electrical energy into mechanical energy. The transmission mechanism 2000 connects the powertrain 1000 and the wheels 3000. The vehicle also includes a frame to withstand the loads of the internal and external environment and a battery for supplying power to the powertrain 1000.

[0073] Figure 2 is a schematic diagram of the powertrain 1000 provided in an embodiment of this application. As shown in Figure 2, the powertrain 1000 includes a motor 100 and a motor controller 200, wherein the motor 100 is a flat-wire motor. The motor controller 200 is used to convert the DC power supplied by the battery into AC power and deliver the AC power to the motor 100. In one embodiment, the powertrain 1000 also includes a reducer 300, and the power output end of the motor 100 is connected to the vehicle wheels 3000 through the reducer 300. The reducer 300 can also be a transmission. The motor 100 of an electric vehicle is typically a permanent magnet synchronous or AC asynchronous motor.

[0074] During motor operation, the resistance generated by the current flowing through the flat wire winding of the motor causes energy loss, which is converted into heat, causing the temperature of the flat wire winding to rise continuously. If the flat wire winding cannot be cooled in time, it will not only damage the service life of the flat wire winding and reduce the working efficiency of the motor, but also pose a risk of electrical failure and safety accidents.

[0075] Figures 3a and 3b show partial structures of the motor 100 provided in the embodiments of this application, and Figure 3c is an exploded view of a partial structure of the motor 100. The motor 100 includes a stator 10 and an annular cover plate 20, which is fixed to one axial end of the stator 10 along the motor's axial direction. In some embodiments, the motor 100 may also include another annular cover plate 20, which is fixed to another circumferential end face of the stator 10 along the motor's axial direction. The two annular cover plates 20 form a space between themselves and the stator 10 that can accommodate coolant to immerse and cool the flat wire windings, thereby providing good cooling to the flat wire windings of the motor 100, improving the efficiency of the motor 100, and enhancing the safety performance of equipment using the motor 100. In one embodiment, the coolant is any one of ethylene glycol-based cooling oil, synthetic oil, and mineral oil. For ease of illustration, the axial direction of the motor 100 is abbreviated as A.

[0076] In this embodiment, the axial direction of the stator, the axial direction of the stator core, and the axial direction of the motor refer to the same direction; the circumferential direction of the stator, the circumferential direction of the stator core, and the circumferential direction of the motor refer to the same direction; and the radial direction of the stator, the radial direction of the stator core, and the radial direction of the motor refer to the same direction.

[0077] As shown in the exploded view of the motor 100 in Figure 3c, the stator 10 includes a stator core 1, a stator winding 2, and an injection-molded part 3. The stator winding 2 is a flat wire winding, and the injection-molded part 3 is an integral injection-molded structure. The stator winding 2 and the injection-molded part 3 are fixed to the stator core 1. The injection-molded part 3 can cooperate with at least one of the aforementioned annular cover plates 20 to form a structure capable of containing coolant to immerse and cool the stator winding 2. In some embodiments, along the axial direction of the motor, one end of the stator winding 2 is a welding end, and the other end is a lead-out end, used for current collection and routing. To adapt to the different structures at both ends of the stator winding 2, the shapes of the annular cover plates 20 at both ends of the stator 10 need to be adjusted accordingly, which will not be specifically described here.

[0078] It should be understood that the structure of one annular cover plate 20 cooperating with the stator 10 is similar to the structure of another annular cover plate 20 cooperating with the stator 10. The purpose of both is to form a space for containing coolant to immerse the stator winding 2. The following embodiments will be described by way of example using one annular cover plate 20 and the stator 10.

[0079] In one embodiment, FIG4 illustrates a partial cross-sectional view of the stator 10 of the motor 100 cooperating with an annular cover plate 20. As shown in FIG4, the stator core 1 includes a central hole 11 and a plurality of winding slots 12. The central hole 11 is used to accommodate the rotor of the motor 100. The plurality of winding slots 12 are used to fix the injection molded part 3 and the stator winding 2. Along the axial direction of the motor, the injection molded part 3 includes a plurality of embedded sections 31 fixed to the winding slots 12 and an exposed section 32. Each embedded section 31 is used to be embedded in a winding slot 12 along the axial direction of the motor, and the exposed section 32 is exposed on an axial end face d of the stator core 1 along the axial direction of the motor. Along the axial direction of the motor 100, the exposed section 32 and the plurality of embedded sections 31 are arranged adjacent to each other, and the structural division of the exposed section 32 and the plurality of embedded sections 31 is shown by dashed lines. In the manufacturing of the motor 100, the annular injection-molded body 3 is integrally injection molded. The exposed section 32 and the multiple embedded sections 31 are an integral structure; the structural division here is only for illustrative purposes. An example of a winding slot 12 is provided, and correspondingly, an embedded section 31 is embedded in the winding slot 12. In one embodiment, the exposed section 32 includes a first annular boss 321. The orientation of the first annular boss 321 is away from the axial end face d of the stator core 1 along the motor's axial direction. One end of the stator winding 2 passes through the exposed section 32 along the motor's axial direction. The end of the stator winding 2 exposed above the axial end face d can be considered as the end winding of the stator winding 2. The end winding of the stator winding 2 surrounds the first annular boss 321 circumferentially around the motor. The first annular boss 321 encloses the annular cover plate 20 to form a receiving cavity S, within which the end winding of the stator winding 2 is received. The cavity S can be used to contain coolant, thereby immersing and cooling the end windings of the stator winding 2 housed in the cavity S. The shape of the cross-section of the first annular boss 321 is not limited; here it is exemplified as rectangular, but it can also be trapezoidal, triangular, or other shapes.

[0080] In the motor 100 provided in this embodiment, a first annular boss 321 of the injection-molded part 3 can act as a barrier between the stator winding 2 and the central hole 11, increasing the creepage distance along the motor axis between the central hole 11 and the stator winding 2. This can shorten the end height of the stator winding 2, which is beneficial for miniaturizing the motor 100. Compared with the oil injection ring end winding cooling scheme in the prior art, the structure is simpler, the cooling effect is better, production costs can be reduced, and the continuous power of the motor 100 can be increased. Furthermore, by using the injection-molded part 3 to ensure the creepage distance, the copper loss and copper usage of the motor 100 can be reduced, motor efficiency can be improved, and production costs can be reduced.

[0081] In one embodiment, the inner diameter of the first annular boss 321 is greater than or equal to the inner diameter of a central hole 11. The first annular boss 321 will not extend radially into the region corresponding to the central hole 11 of the stator core 1 along the axial direction of the motor, and will not affect the assembly of the stator 10 and the rotor.

[0082] Figure 5 illustrates the structure of a stator core 1 according to an embodiment of this application. As shown in Figure 5, taking the overall structure of the stator core 1 as a reference, the stator core 1 includes a central hole 11 and multiple winding slots 12. Along the axial direction of the motor, the stator core 1 includes two axial end faces d. The central hole 11 penetrates the stator core 1 along the axial direction of the motor, meaning that both ends of the central hole 11 are connected to the two axial end faces d respectively. Each winding slot 12 penetrates the stator core 1 along the axial direction of the motor, meaning that both ends of each winding slot 12 are connected to the two axial end faces d respectively. The multiple winding slots 12 are arranged at intervals along the circumference of the motor, and a stator tooth is formed between any two adjacent winding slots 12. The portion between the bottom of each winding slot 12 and the outer circumferential surface of the stator core 1 is the yoke of the stator. In one embodiment, the distance between any two winding slots 12 is approximately equal along the circumference of the motor, and the structure of the stator core 1 is centrally symmetrical along the circumference of the motor. In one embodiment, each winding slot 12 is connected to the center hole 11 along the radial direction of the motor.

[0083] In one embodiment, the stator core 1 provided in this application embodiment can be circulated with oil or water for cooling. Referring again to Figure 5, the stator core 1 includes a plurality of stator laminations arranged adjacent to each other along the axial direction of the motor. These stator laminations can form liquid cooling channels in the stator core 1. The plurality of stator laminations includes at least one first stator lamination 101 and a plurality of second stator laminations 102, which are arranged adjacent to each other along the axial direction of the motor. One or more stacked second stator laminations 102 can form one or more axial liquid cooling channels t1, each axial liquid cooling channel t1 extending along the axial direction of the motor to two axial end faces d of the stator core 1. The at least one first stator lamination 101 can form a circumferential liquid cooling channel t2, which is connected to the outer circumferential surface of the stator core 1 and extends along the circumferential direction of the motor. The one or more axial liquid cooling channels t1 are all connected to the circumferential liquid cooling channel t2. By introducing coolant into the circumferential liquid cooling channel t2, the coolant can be guided to the one or more axial liquid cooling channels t1. The one or more axial liquid cooling channels t1 can guide the coolant to the two axial end faces d of the stator core 1.

[0084] The aforementioned circumferential liquid cooling channel t2 can be formed by a single first stator lamination 101 or by a combination of multiple first stator laminations 101. When the stator core 1 includes multiple first stator laminations 101, the structures of the multiple first stator laminations 101 can be the same or different, as long as they can form a circumferential liquid cooling channel t2 that is connected to the axial liquid cooling channel t1.

[0085] In some embodiments, multiple second stator laminations 102 are stacked and arranged between two sets of first stator laminations 101 along the axial direction of the motor. Each set of second stator laminations 102 includes one second stator lamination 102 or multiple stacked first stator laminations 101. Each set of second stator laminations 102 forms one or more axial liquid cooling channels t1. One axial liquid cooling channel t1 formed by one set of second stator laminations 102 communicates with another axial liquid cooling channel t1 formed by another set of second stator laminations 102 through holes on multiple second stator laminations 102. When the coolant enters any one of the axial liquid cooling channels t1 along the circumferential liquid cooling channel t2, the coolant will be divided into two parts along the axial direction of the motor. One part flows along the axial liquid cooling channel t1 formed by one set of second stator laminations 102 to one axial end face d of the stator core 1, and the other part flows along the axial liquid cooling channel t1 formed by another set of second stator laminations 102 to the other axial end face d of the stator core 1.

[0086] Figure 6a illustrates the structure of an injection-molded part 3 for a motor 100 according to an embodiment of this application. As shown in Figure 6a, the injection-molded part 3 is annular. In one embodiment, taking one end of the injection-molded part 3 along the axial direction of the motor as a reference, the injection-molded part 3 includes an exposed section 32 and multiple embedded sections 31. The exposed section 32 is annular, and the multiple embedded sections 31 are formed on one side of the exposed section 32 along the axial direction of the motor. The multiple embedded sections 31 included in the injection-molded part 3 are arranged at intervals along the circumference of the motor. Each embedded section 31 is used to be embedded in a winding slot 12 of the stator core 1 along the axial direction of the motor. The exposed section 32 included in the injection-molded part 3 is used to expose an axial end face d of the stator core 1 along the axial direction of the motor. Along the radial direction of the motor, the outer diameter of the exposed section 32 is larger than the outer diameter of any embedded section 31. The exposed section 32 includes multiple through holes g, which are arranged at intervals along the circumference of the motor. Each through hole g penetrates the exposed section 32 along the axial direction of the motor.

[0087] In one embodiment, each embedded section 31 is pipe-shaped, and each embedded section 31 encloses an axial flow channel q1 extending along the axial direction of the motor. Each embedded section 31 also includes at least one radial flow channel q2, and each radial flow channel q2 communicates with an axial flow channel q1 radially along the motor. The exposed section 32 also includes a plurality of through holes p, each through hole p extending through the exposed section 32 along the axial direction of the motor to communicate with an axial flow channel q1.

[0088] In one embodiment, along the radial direction of the motor, the size of each through-hole p is greater than or equal to the size of each winding slot 12, and the distance between two adjacent through-holes p along the circumferential direction of the motor is less than or equal to the distance between two corresponding adjacent winding slots 12. The larger through-hole p, while connecting the axial flow channel q, can avoid the stator winding 2 extending into the winding slot 12.

[0089] As shown in Figure 6b, when an embedded segment 31 of the injection molded part 3 is embedded into a winding slot 12 of the corresponding stator core 1, the embedded segment 31 extends along the slot wall of the winding slot 12, covering the inner wall of the winding slot 12 and filling the opening 121 of the winding slot 12 for connecting the center hole 11. The axial flow channel q1 formed by the embedded segment 31 is isolated from the center hole 11. Due to the obstruction of the embedded segment 31, current cannot flow from the stator winding 2 to the stator core 1, thereby avoiding short circuits and motor damage. In addition, the injection molded part 3 itself can prevent external moisture and impurities from corroding the flat wire winding, improving the reliability and safety of the motor 100. For ease of illustration, the circumferential direction of the motor 100 is referred to by the abbreviation C.

[0090] In one embodiment, after an embedded segment 31 is embedded in a winding slot 12 and covers the slot wall of the winding slot 12, the cross-sectional dimension of the space enclosed by the embedded segment 31 is smaller than the cross-sectional dimension of the winding slot 12. Here, the size of the through hole p of the exposed segment 32 along the radial direction of the motor can be greater than or equal to the size of the embedded segment 31, and the distance between two adjacent through holes p along the circumferential direction of the motor can be less than or equal to the distance between two corresponding adjacent embedded segments 31, which can also meet the requirement of avoiding the stator winding 2 protruding from the winding slot 12.

[0091] In one embodiment, the embedded section 31 of the injection molded part 3 does not protrude from the center hole 11 of the stator core 1 along the radial direction of the motor. Each embedded section 31 is embedded in the winding slot 12 along the axial direction of the motor during injection molding. The embedded section 31 will not extend into the center hole 11 and affect the assembly of the stator 10 and the rotor.

[0092] Figure 7a shows the structure of a stator core 1 and injection molded part 3 of a motor 100 according to an embodiment of this application, and Figure 7b is a detailed enlarged view of V1 in Figure 7a. Referring to Figures 7a and 7b together, during the manufacturing process of the motor 100, the structure shown in Figure 7a can be obtained by integrally injection molding the injection molded part 3 to the stator core 1 through an in-mold injection molding process. The injection molded part 3 includes multiple embedded segments 31 that are respectively embedded into multiple winding slots 12 of the stator core 1 along the axial direction of the motor, with one embedded segment 31 embedded in each winding slot 12. In one embodiment, each embedded segment 31 extends along the inner wall of the corresponding winding slot 12 and covers the inner wall of the winding slot 12, and the embedded segment 31 covers the winding slot 12. The labels of the winding slots 12 shown in Figures 7a and 7b indicate the location of the winding slots 12. The injection-molded part 3 includes an exposed section 32 that exposes an axial end face d of the stator core 1 along the axial direction of the motor, covering the axial end face d of the stator core 1. A first annular boss 321 is formed on the inner edge of the exposed section 32, and its inner diameter along the radial direction of the motor is greater than or equal to the inner diameter of a central hole 11 in the stator core 1. A plurality of through holes g of the exposed section 32 are arranged at intervals along the circumferential direction of the motor. Each through hole g communicates along the axial direction of the motor with one or more axial liquid cooling channels t1 of the stator core 1. A circumferential liquid cooling channel t2 can communicate with a through hole g through one or more axial liquid cooling channels t1. In one embodiment, each through hole g communicates with an axial liquid cooling channel t1, and the diameter of the through hole g is greater than or equal to the diameter of the port of the corresponding axial liquid cooling channel t1 located on the axial end face d. In another embodiment, each through hole p of the exposed section 32 communicates along the axial direction of the motor with an axial flow channel q1.

[0093] In one embodiment, the outer diameter of the exposed section 32 is less than or equal to the outer peripheral surface of the stator core 1. As shown in FIG7b, the outer edge of the exposed section 32 is exemplarily located at the yoke of the stator core 1, and the outer diameter of the exposed section 32 is less than the outer diameter of the stator core 1 and greater than the distance between the bottom of the winding slot 12 and the center of the stator core 1.

[0094] Referring to Figure 7b, a partial cross-sectional view of the stator core 1 and the injection molded part 3 can be obtained by cutting along the radial direction of the motor at position P1, as shown in Figure 8a. This cross-section passes through a winding slot 12 of the stator core 1 and an embedded section 31 embedded in the winding slot 12. As shown in Figure 8a, each embedded section 31 is embedded in a winding slot 12. The embedded section 31 extends around the inner wall of the winding slot 12. The stator winding 2 contained in the winding slot 12 is enclosed by the embedded section 31. That is, the part of the stator winding 2 contained in the winding slot 12 is contained in the space enclosed by the embedded section 31. The embedded section 31 can act as an insulating material to separate the stator winding 2 from the winding slot 12 of the stator core 1, without the need for additional insulating materials such as insulating paper.

[0095] The axial flow channel q1 enclosed by the embedded section 31 is isolated from the central hole 11 by a portion of the embedded section 31. The axial flow channel q1 extends axially along the motor to the two axial end faces d of the stator core 1. Each embedded section 31 also includes a radial flow channel q2, which can connect the circumferential liquid cooling channel t2 of the stator core 1 to one or more axial flow channels q2 along the radial direction of the motor. The axial flow channel q1 enclosed by the embedded section 31 surrounds the stator winding 2 housed in the winding slot 12. When the coolant in the circumferential liquid cooling channel t2 enters the axial flow channel q1 enclosed by the embedded section 31 along the radial flow channel q2, the coolant can immerse and cool the stator winding 2 housed in the winding slot 12 in the axial flow channel q1.

[0096] In one embodiment, each axial flow channel q1 extends along the axial direction of the motor to the exposed section 32 and communicates with a through hole p of the exposed section 32. The axial flow channel q1 can communicate with the space on the side of the exposed section 32 away from the axial end face d through the through hole p. The coolant can flow along the axial flow channel q1 to the side of the exposed section 32 away from the axial end face d.

[0097] Referring to Figure 7b, a partial cross-sectional view of the stator core 1 and the injection molded part 3 can be obtained by cutting along the radial direction of the motor at position P2, as shown in Figure 8b. This cross-section passes through an axial liquid cooling channel t1 of the stator core 1 and a through hole g of the injection molded part 3. As shown in Figure 8b, the axial liquid cooling channel t1 extends along the axial direction of the motor to the two axial end faces d of the stator core 1, and the axial liquid cooling channel t1 is connected to the through hole g along the axial direction of the motor. Along the radial direction of the motor, a circumferential liquid cooling channel t2 extends to communicate with the axial liquid cooling channel t1.

[0098] Figure 9 illustrates the structure of a stator core 1, stator winding 2, and injection molded part 3 of a motor 100 according to an embodiment of this application. As shown in Figure 9, the stator winding 2 is wound in the winding slots 12 of the stator core 1. The stator winding 2 accommodated in each winding slot 12 passes through the embedded section 31 embedded in the winding slot 12 and extends out to the exposed section 32, such that the end winding of the stator winding 2 is exposed on the exposed section 32 away from one axial end face d of the stator core 1. In some embodiments, the structure of the stator winding 2 and injection molded part 3 on the other axial end face d of the stator core 1 can be similar to the structure shown in Figure 9.

[0099] Referring to Figure 9, a partial cross-sectional view of the stator core 1, stator winding 2, and injection molded part 3 can be obtained by cutting along the radial direction of the motor at position Q, as shown in Figure 10. This cross-section passes through a winding slot 12 of the stator core 1 and an embedded section 31 embedded in the winding slot 12. As shown in Figure 10, in one embodiment, the stator winding 2 includes multiple flat wires 21, and each winding slot 12 of the stator core 1 contains multiple flat wires. The multiple flat wires contained in each winding slot 12 are arranged radially along the motor. The portion of the stator winding 2 exposed on the axial end face d of the stator core 1 can be considered as the end winding of the stator winding 2. The end winding of the stator winding 2 is exposed along the axial direction of the motor through the exposed section 32 of the injection molded part 3. Taking a winding slot 12 as an example, the embedded section 31 embedded in the winding slot 12 extends along the slot wall of the winding slot 12 and covers the winding slot 12. Multiple flat wires 21, housed in the winding slot 12, are arranged radially within the space enclosed by the embedded section 31. Each flat wire 21 extends axially from an exposed section 32 of the injection-molded part 3. Specifically, the multiple flat wires 21 housed in the winding slot 12 are located within the axial flow channel q1 formed by the embedded section 31. These multiple flat wires 21 extend through a through hole p onto the side of the exposed section 32 opposite to the axial end face d. The axial flow channel q1 can receive coolant from the circumferential liquid cooling channel t2 of the stator core 1 via the radial flow channel q2 as shown by the dashed arrow in the figure. The coolant in the axial flow channel q1 can immerse and cool the multiple flat wires 21 housed in the winding slot 12.

[0100] Figure 11a is an enlarged view of the partial structural details of the stator core 1, stator winding 2, and injection molded part 3 of a motor 100 provided in an embodiment of this application. As shown in Figure 11a, taking a winding slot 12 as an example, the portions of multiple flat wires 21 housed in the winding slot 12 that expose the axial end face d are arranged radially along the first annular boss 321 on the side away from the central hole 11, that is, the end windings of the stator winding 2 are wrapped around the outside of the first annular boss 321. It can also be considered that, along the radial direction of the motor, the outer diameter of the first annular boss 321 is less than or equal to the inner diameter of the portion of the stator winding 2 that exposes the axial end face d.

[0101] Figure 11b is a simplified cross-sectional view of the stator core 1, stator winding 2, and injection-molded part 3. As shown in Figure 11b, along the axial direction of the motor, the first annular boss 321 protrudes from the surface of the exposed section 32 away from the axial end face d. Along the radial direction of the motor, the first annular boss 321 acts as a barrier between the central hole 11 and the stator winding 2. The creepage distance from the inner wall of the central hole 11 to the stator winding 2 is the sum of the radial thickness of the first annular boss 321, the height of the first annular boss 321 protruding from the surface of the exposed section 32, and the distance between the first annular boss 321 and the stator winding 2. The spacing between the first annular boss 321 and the stator winding 2 along the radial direction of the motor meets the creepage distance requirement between the center hole 11 and the stator winding 2. This reduces the creepage distance requirement between the center hole 11 and the stator winding 2 along the axial direction of the motor, thereby reducing the height of the injection molded part 3 along the axial direction of the motor. This helps to reduce the height of the stator winding 2 exposed on the axial end face d of the stator core 1, and further reduces the axial dimension of the motor 100, thus meeting the miniaturization requirements of the motor 100.

[0102] In one embodiment, Figure 12a shows a schematic diagram of the assembly structure of the stator core 1, stator winding 2, injection molded part 3, and an annular cover plate 20. Figure 12b is a detailed enlarged view of V2 in Figure 12a. The stator winding 2 and the injection molded part 3 are fixed to multiple winding slots 12 of the stator core 1. Each embedded segment 31 of the injection molded part 3 is embedded into a winding slot 12 along the axial direction of the motor. An exposed segment 32 of the injection molded part 3, which is exposed on an axial end face d of the stator core 1, covers the axial end face d. An annular cover plate 20, along the axial direction of the motor, cooperates with the exposed segment 32 to form a space for accommodating coolant. The circumferential liquid cooling channel t2 of the stator core 1 is connected to multiple axial liquid cooling channels t1. In one embodiment, another annular cover plate 20 is also disposed at the other end of the stator core 1 along the circumference of the motor.

[0103] Referring to Figure 12a, and continuing to Figure 12b, the axial flow channel q1 formed by each embedded section 31 communicates with the receiving cavity S through a through hole p in the exposed section 32. The end of the stator winding 2 contained in each axial flow channel q1 can extend into the receiving cavity S through the corresponding through hole p. The coolant in the axial flow channel q1 can immerse and liquid cool the stator winding 2 contained therein, and the coolant in the receiving cavity S can immerse and liquid cool the end of the stator winding 2.

[0104] The annular cover plate 20 includes a first annular flange 201. After the annular cover plate 20 surrounds the first annular boss 321 of the injection molded part 3, the first annular flange 201 is arranged radially along the motor between the first annular boss 321 and the end of the protruding section 32 of the stator winding 2. When the annular cover plate 20 is assembled with the injection molded part 3, the first annular flange 201 and the first annular boss 321 can be positioned and fixed along the axial direction of the motor, improving the ease of installation. The radial arrangement of the first annular flange 201 and the first annular boss 321 also increases the contact area between the annular cover plate 20 and the protruding section 32, enhancing the fixing and sealing effect.

[0105] In one embodiment, the annular cover plate 20 further includes one or more outlets K for discharging coolant from a receiving cavity S. Along the radial direction of the motor, the distance between each outlet K and the axis of the annular cover plate 20 is greater than the outer diameter of the first annular flange 201. Specifically, as shown in FIG12a, the annular cover plate 20 includes a base plate 202 facing away from an axial end face d of the stator core 1. The outlets K are formed on the base plate 202 and penetrate the base plate 202 along the axial direction of the motor to communicate with the receiving cavity S.

[0106] Figure 13a shows a simplified cross-sectional view of the annular cover plate 20 and the stator 10. As shown in Figure 13a, the annular cover plate 20 is connected to the exposed section 32 of the injection molded part 3 along the axial direction of the motor and towards one axial end face d of the stator core 1, forming a receiving cavity S between the annular cover plate 20 and the exposed section 32. The end of the stator winding 2 extends out of the winding slot 12 along the axial direction of the motor and then passes through the exposed section 32 into the receiving cavity S. The first annular boss 321 of the exposed section 32 and the first annular flange 201 of the annular cover plate 20 are arranged radially along the motor, with the first annular flange 201 located between the first annular boss 321 and the stator winding 2. Along the axial direction of the motor, the end of the first annular flange 201 facing the axial end face d abuts against the surface of the exposed section 32 opposite to the axial end face d. The length of the portion of the stator winding 2 that passes through the exposed section 32 is greater than the length of the first annular boss 321 and less than the length of the first annular flange 201. The wiring at the end of the stator winding 2 will not be affected by the first annular boss 321, and the bottom plate 202 of the annular cover plate 20 will not contact the end of the stator winding 2, thereby ensuring the function of the stator winding 2.

[0107] In one embodiment, the inner diameter of the annular cover plate 20 is substantially the same as the inner diameter of the exposed section 32, and the inner diameter of the first annular boss 321 is the same as the inner diameter of the exposed section 32. The inner diameter of the first annular flange 201 is larger than the inner diameter of the annular cover plate 20, and the inner circumferential surface of the annular cover plate 20 and the first annular flange 201 are stepped. After the annular cover plate 20 and the exposed section 32 are engaged, the first annular flange 201 is arranged radially along the motor between the first annular boss 321 and the end of the stator winding 2.

[0108] In one embodiment, the inner diameter of the first annular flange 201 is larger than the outer diameter of the first annular boss 321 along the radial direction of the motor. Sealing materials such as sealant can be filled into the gap between the first annular flange 201 and the exposed section 32 to enhance the tightness of the fit between them. Specifically, sealing materials such as sealant can be filled into the area indicated by the dashed circle in Figure 13a to enhance the fixing and sealing effect between the annular cover plate 20 and the exposed section 32.

[0109] Figure 13b illustrates a structure for filling the gap between the first annular flange 201 and the exposed section 32 with a sealing material M such as sealant. As shown in Figure 13b, a portion of the sealing material M is distributed along the axial direction of the motor between the first annular flange 201 and the exposed section 32, and a portion of the sealing material M is distributed along the radial direction of the motor between the first annular flange 201 and the first annular boss 321 of the exposed section 32.

[0110] In one embodiment, to facilitate the mating of the annular cover plate 20 with the exposed section 32, the first annular flange 201 is fitted radially to the outer periphery of the first annular boss 321, as shown in FIG13c. An inclined surface J can be formed between the end face of the first annular boss 321 facing away from the axial end face d and the outer peripheral surface. When the first annular flange 201 of the annular cover plate 20 mates with the first annular boss 321 along the axial direction of the motor, the inclined surface J can guide the first annular flange 201 along the axial direction of the motor, making it easier for the first annular flange 201 to be assembled onto the first annular boss 321.

[0111] In the motor 100 provided in this application embodiment, the structure in which the annular cover plate 20 and the exposed section 32 of the stator 10 cooperate to form the receiving cavity S may also have various structural variations.

[0112] Figure 14a shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 13a, the difference lies in that the inner diameter of the annular cover plate 20 in Figure 14a is the same as the inner diameter of the first annular flange 201, and the inner diameter of the annular cover plate 20 is greater than or equal to the outer diameter of the first annular boss 321. After the annular cover plate 20 mates with the exposed section 32, the first annular flange 201 is arranged radially along the motor between the first annular boss 321 and the end of the stator winding 2.

[0113] In one embodiment, the annular cover plate 20 further includes a second annular flange 203 that surrounds the first annular flange 201 along the circumference of the motor. The second annular flange 203 is used to cooperate with the exposed section 32, so that the annular cover plate 20 and the exposed section 32 can be closed to form a receiving cavity S. The first annular flange 201 and the second annular flange 203 can be considered as two annular flanges included in the annular cover plate 20, with the first annular flange 201 being one annular flange and the second annular flange 203 being the other annular flange. In Figure 14a, the second annular flange 203 is connected along the axial direction of the motor to the surface of the exposed section 32 opposite to the axial end face d, and the two can be sealed by bonding with a material such as sealant.

[0114] Figure 14b illustrates a simplified cross-sectional view of a portion of the annular cover plate 20 of a motor 100 that mates with the stator 10. The difference between the motor 100 shown in Figure 14a and the one shown is that the second annular flange 203 is connected to the outer peripheral surface of the exposed section 32 along the radial direction of the motor, and the two can be sealed together using materials such as sealant.

[0115] Figure 15a shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 14a, the difference lies in that the exposed section 32 shown in Figure 15a further includes a second annular boss 322, which surrounds the first annular boss 321 circumferentially around the motor. Radially, the outer diameter of the second annular boss 322 is less than or equal to the outer diameter of the stator core 1, and the inner diameter is greater than or equal to the length of each winding slot 12. An annular groove is formed between the second annular boss 322 and the first annular boss 321, and the opening of this groove is axially away from the axial end face d of the stator core 1. Correspondingly, the annular cover plate 20 also serves to enclose the second annular boss 322. The first annular boss 321 and the second annular boss 322 can be considered as two annular bosses included in the exposed section 32, with the first annular boss 321 being one annular boss and the second annular boss 322 being the other annular boss. When the annular cover plate 20 mates with the exposed section 32, the two annular bosses can be more precisely installed and positioned with the annular cover plate 20, achieving a more stable fixing effect, which is beneficial to improving the sealing performance of the receiving cavity S and the stability of the structure.

[0116] Along the motor's axial direction, the heights of both the first annular boss 321 and the second annular boss 322 are less than the height of the stator winding 2 protruding from the exposed section 32. The creepage distance between the first annular boss 321 and the center hole 11 and the stator winding 2 is related, therefore the length of the first annular boss 321 along the motor's axial direction needs to meet certain conditions. The second annular boss 322 is used to mate with the annular cover plate 20, and its length along the motor's axial direction is not limited. In some embodiments, the length of the first annular boss 321 is greater than the length of the second annular boss 322 along the motor's axial direction, which is beneficial for reducing the end height of the stator winding 2.

[0117] In the motor example shown in Figure 15a, the second annular flange 203 is arranged radially between the second annular boss 322 and the stator winding 2, increasing the contact area between the annular cover plate and the exposed section, thus enhancing the fixing and sealing effect. In one embodiment, as shown in Figure 15b, the space between the second annular flange 203 and the exposed section 32 can also be filled with sealing materials such as sealant to improve the sealing effect.

[0118] In one embodiment, as shown in FIG15c, an inclined surface J is formed between the end face of the second annular boss 322 facing away from the axial end face d and the outer peripheral surface. When the second annular flange 203 of the annular cover plate 20 mates with the second annular boss 322 along the axial direction of the motor, the inclined surface J can guide the second annular flange 203 along the axial direction of the motor, making it easier for the second annular flange 203 to be assembled onto the second annular boss 322.

[0119] Figure 15d shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 15a, the difference lies in that the inner diameter of the first annular flange 201 is larger than the inner diameter of the annular cover plate 20, and the inner circumferential surface of the annular cover plate 20 and the first annular flange 201 form a step. The outer diameter of the second annular flange 203 is smaller than the outer diameter of the annular cover plate 20, and the outer circumferential surface of the annular cover plate 20 and the second annular flange 203 form a step.

[0120] Figure 16a shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 15a, the difference lies in that the second annular flange 203 is arranged radially between the second annular boss 322 and the outer circumferential surface of the stator core 1, and the inner diameter of the second annular flange 203 is greater than or equal to the outer diameter of the second annular boss 322. Of course, the space between the second annular flange 203 and the second annular boss 322 can also be filled with sealing materials such as sealant to improve the sealing effect.

[0121] Figure 16b shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 16a, the difference lies in that the inner diameter of the first annular flange 201 is larger than the inner diameter of the annular cover plate 20, and the inner circumferential surface of the annular cover plate 20 and the first annular flange 201 form a step. Similarly, the inner diameter of the second annular flange 203 is larger than the inner diameter of the annular cover plate 20, and the inner circumferential surface of the annular cover plate 20 and the second annular flange 203 form a step.

[0122] Figure 17 shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. A portion of the second annular flange 203 is arranged radially between the second annular boss 322 and the stator winding 2, and another portion of the second annular flange 203 is arranged radially between the second annular boss 322 and the outer peripheral surface of the stator core 1. These two portions of the second annular flange 203 form a groove that can accommodate the second annular boss 322.

[0123] Figure 18 shows a simplified cross-sectional view of the annular cover plate 20 of a motor 100 that mates with the stator 10. Compared to the motor 100 shown in Figure 14a, the difference lies in the fact that the exposed section 32 in Figure 18 has a notch w formed at its edge along the radial direction of the motor, near the outer peripheral surface of the stator core 1. The connection between the annular cover plate 20 and the exposed section 32 at this point can be achieved using a sealing material M, such as sealant. The notch w can accommodate this sealing material M, preventing it from overflowing and affecting the assembly of the stator 10 and the rotor.

[0124] An embodiment of this application provides a motor 100 comprising two injection-molded parts 3, as shown in FIG19. The two injection-molded parts 3 are respectively injection-molded with the stator core 1 along the axial direction of the motor, which can reduce the difficulty of the process. The two injection-molded parts 3 have similar structures, each injection-molded part 3 including an exposed section 32 and multiple embedded sections 31. The two injection-molded parts 3 can be symmetrically connected along the axial direction of the motor, such that the multiple embedded sections 31 of one injection-molded part 3 are respectively connected to the multiple embedded sections 31 of the other injection-molded part 3. In one embodiment, each injection-molded part 3 further includes a connecting section 33, which, along the axial direction of the motor, is connected to both ends of the multiple embedded sections 31 along with the exposed section 32. Along the radial direction of the motor, the outer diameter of the connecting section 33 is approximately equal to the outer diameter of each embedded section 31 and smaller than the outer diameter of the exposed section 32.

[0125] In one embodiment, the connecting segment 33 of each injection molded part 3 connects multiple embedded segments 31 away from the exposed segment 32 along the circumference of the motor, and any two adjacent embedded segments 31 are connected by a portion of the connecting segment 33. When the injection molded part 3 and a portion of the stator core 1 are injection molded, the connecting segment 33 can at least partially cover the end face between any two adjacent winding slots 12 along the circumference of the motor, which can strengthen the connection and fixation between the injection molded part 3 and the stator core 1.

[0126] In one embodiment, the plurality of radial flow channels q2 included in the injection molded part 3 can be formed by a connecting section 33. Specifically, the connecting section 33 is formed with a plurality of through slots, each through slot connecting the outer peripheral surface of the connecting section 33 to an embedded section 31 along the radial direction of the motor, and the through slot can form a radial flow channel q2.

[0127] In one embodiment, the stator core 1 includes a plurality of first stator laminations 101 and at least one second stator lamination 102. As shown in FIG20a, the plurality of first stator laminations 101 include laminations with two different structures, namely first stator lamination 101a and first stator lamination 101b. Specifically, there are two first stator laminations 101b, which are arranged adjacent to each other along the axial direction of the motor. There are also two first stator laminations 101a, which are arranged on both sides of the two first stator laminations 101b along the axial direction of the motor. There are at least two second stator laminations 102, with one second stator lamination 102 arranged on the side of each first stator lamination 101a away from the first stator lamination 101a along the axial direction of the motor.

[0128] In one embodiment, each first stator lamination 101a includes a first central through hole 1011, a plurality of first grooves 1012, a plurality of connecting holes 1013, a plurality of axial through holes 1014, and a plurality of second grooves 1015. The first central through hole 1011, the plurality of first grooves 1012, the plurality of connecting holes 1013, the plurality of axial through holes 1014, and the plurality of second grooves 1015 respectively penetrate the first stator lamination 101a along the axial direction of the motor. The plurality of first grooves 1012 are arranged at intervals along the circumference of the motor, the plurality of connecting holes 1013 are arranged at intervals along the circumference of the motor, the plurality of axial through holes 1014 are arranged at intervals along the circumference of the motor, and the plurality of second grooves 1015 are arranged at intervals along the circumference of the motor. Multiple first grooves 1012 are respectively connected to the first central through hole 1011 along the radial direction of the motor. Each connecting hole 1013 is connected to the bottom of the groove of one of the first grooves 1012 along the radial direction of the motor. The second groove 1015 is connected to the outer peripheral surface of the first stator lamination 101a along the radial direction of the motor. Along the radial direction of the motor, the distance between the side of the connecting hole 1013 away from the first central through hole 1011 and the first central through hole 1011 is greater than the distance between the axial through hole 1014 and the first central through hole 1011. The length of the second groove 1015 is greater than the distance between the axial through hole 1014 and the outer peripheral surface of the first stator lamination 101a.

[0129] In one embodiment, each first stator lamination 101b includes a first central through hole 1011, a plurality of connecting holes 1013, a plurality of axial through holes 1014, and a plurality of second grooves 1015. The first central through hole 1011, the plurality of connecting holes 1013, the plurality of axial through holes 1014, and the plurality of second grooves 1015 respectively penetrate the first stator lamination 101a along the axial direction of the motor. The plurality of connecting holes 1013 are arranged at intervals along the circumference of the motor, the plurality of axial through holes 1014 are arranged at intervals along the circumference of the motor, and the plurality of second grooves 1015 are arranged at intervals along the circumference of the motor. Each connecting hole 1013 communicates with the first central through hole 1011 along the radial direction of the motor, and the second groove 1015 communicates with the outer peripheral surface of the first stator lamination 101a along the radial direction of the motor. Along the radial direction of the motor, the distance between the side of the connecting hole 1013 away from the first central through hole 1011 and the first central through hole 1011 is greater than the distance between the axial through hole 1014 and the first central through hole 1011, and the length of the second groove 1015 is greater than the distance between the axial through hole 1014 and the outer peripheral surface of the first stator lamination 101a.

[0130] In one embodiment, each second stator lamination 102 includes a second central through-hole 1021, a plurality of third grooves 1022, and a plurality of guide holes 1023. A first central through-hole 1011 and the plurality of guide holes 1023 respectively penetrate the first stator lamination 101a along the axial direction of the motor. The plurality of third grooves 1022 are arranged at intervals along the circumference of the motor, and the plurality of guide holes 1023 are also arranged at intervals along the circumference of the motor. Each third groove 1022 communicates with the second central through-hole 1021 along the radial direction of the motor. Along the circumference of the motor, each guide hole 1023 is arranged between two adjacent third grooves 1022. Along the radial direction of the motor, the distance between each guide hole 1023 and the second central through-hole 1021 is greater than the length of each third groove 1022. Each guide hole 1023 can form part of the circumferential liquid cooling channel t1 of the stator core 1.

[0131] It should be understood that the first central through hole 1011 of the first stator lamination 101 and the plurality of second central through holes 1021 of the at least one second stator lamination 102 connected along the axial direction of the motor can form part of the central hole 11 of the stator core 1, and the plurality of first grooves 1012 of the first stator lamination 101 and the plurality of third grooves 1022 of the at least one second stator lamination 102 connected along the axial direction of the motor can form part of the plurality of winding slots 12 of the stator core 1.

[0132] In one embodiment, in the first stator lamination 101, a plurality of connecting holes 1013 and a plurality of axial through holes 1014 are alternately distributed along the circumference of the motor. Each axial through hole 1014 is adjacent to one connecting hole 1013 on each side, and each connecting hole 1013 is arranged with one axial through hole 1014 on each side. Along the radial direction of the motor, each second groove 1015 is spaced apart from one connecting hole 1013. Along the circumference of the motor, the arrangement of the plurality of second grooves 1015 is not uniform; in some cases, two axial through holes 1014 are spaced apart between two adjacent second grooves 1015, and in some cases, one axial through hole 1014 is spaced apart between two adjacent second grooves 1015.

[0133] The structure of the first stator lamination 101b is similar to that of the first stator lamination 101a. The number and spacing of the connecting holes 1013, the number and spacing of the axial through holes 1014, and the number and spacing of the second grooves 1015 are all the same. Among them, along the circumference of the motor, the arrangement of the multiple second grooves 1015 is uneven. In some cases, two axial through holes 1014 are arranged between two adjacent second grooves 1015, and in some cases, one axial through hole 1014 is arranged between two adjacent second grooves 1015.

[0134] In one embodiment, the stator core 1 provided in this application includes two first stator laminations 101b that are rotated by a set angle along the circumference of the motor and then stacked along the axial direction of the motor. As shown in FIG20b, the first central through hole 1011m of one first stator lamination 101b coincides with the first central through hole 1011n of the other first stator lamination 101b along the axial direction of the motor. A plurality of axial through holes 1014m of one first stator lamination 101b and a plurality of axial through holes 1014n of the other first stator lamination 101b are misaligned along the circumference of the motor. Each axial through hole 1014m connects to two axial through holes 1014n along the circumference of the motor, and each axial through hole 1014n connects to two axial through holes 1014m along the circumference of the motor. The plurality of axial through holes 1014 can connect to form a circumferential channel extending along the circumference of the motor. This circumferential channel can serve as part of the circumferential liquid cooling channel t2 of the stator core 1. When there is coolant in any axial through hole 1014, the coolant can flow along the circumference of the motor in the circumferential channel.

[0135] In one embodiment, referring to Figure 20b, an axial through hole 1014m connects to a second groove 1015n and a connecting hole 1013n along the radial direction of the motor. The axial through hole 1014n also connects to the second groove 1015m and the connecting hole 1013m along the radial direction of the motor. Coolant at the outer peripheral surface of the first stator lamination 101b can flow through the second groove 1015m and the axial through hole 1014n to the connecting hole 1013m, or vice versa. The second groove 1015, the axial through hole 1014, and the connecting hole 1013 can connect to form a radial channel extending radially along the motor. This radial channel can serve as part of the circumferential liquid cooling channel t2 of the stator core 1, allowing coolant to flow radially along the motor.

[0136] In one embodiment, a first stator lamination 101b and a first stator lamination 101a are coaxially stacked along the axial direction of the motor, as shown in FIG20c. The orthographic projection of the first central through hole 1011a of the first stator lamination 101a onto the first stator lamination 101b falls within the range of the first central through hole 1011b of the first stator lamination 101b. A plurality of connecting holes 1013a of the first stator lamination 101a are connected one-to-one with a plurality of connecting holes 1013b of the first stator lamination 101b along the axial direction of the motor. In one embodiment, the shape and size of one connecting hole 1013a of the first stator lamination 101a are approximately the same as the shape and size of one connecting hole 1013a of the corresponding connected first stator lamination 101b. The plurality of axial through holes 1014a of the first stator lamination 101a are connected one-to-one with the plurality of axial through holes 1014b of the first stator lamination 101b along the axial direction of the motor. In one embodiment, the shape and size of one axial through hole 1014a of the first stator lamination 101a are approximately the same as the shape and size of one axial through hole 1014b of the corresponding connected first stator lamination 101b. The plurality of second grooves 1015a of the first stator lamination 101a are connected one-to-one with the plurality of second grooves 1015b of the first stator lamination 101b along the axial direction of the motor. In one embodiment, the shape and size of one second groove 1015a of the first stator lamination 101a are approximately the same as the shape and size of one second groove 1015b of the corresponding connected first stator lamination 101b.

[0137] The structure of the first stator lamination 101b differs from that of the first stator lamination 101a in that the first stator lamination 101b does not include the first groove 1012, and the inner diameter of the first central through hole 1011 of the first stator lamination 101b is larger than the inner diameter of the first central through hole 1011 of the first stator lamination 101a. When one first stator lamination 101b and one first stator lamination 101a are coaxially stacked along the axial direction of the motor, referring to Figure 20c, in one embodiment, each first groove 1012 of the first stator lamination 101a communicates with the first central through hole 1011 of the first stator lamination 101b along the axial direction of the motor.

[0138] In one embodiment, as shown in FIG20d, the first stator laminations 101a and 101b are stacked and then stacked with the second stator lamination 102. Each guide hole 1023 of the second stator lamination 102 is connected along the axial direction of the motor to an axial through hole 1014 of the first stator lamination 101a and an axial through hole 1014 of the first stator lamination 101b. Each third groove 1022 of the second stator lamination 102 is connected along the axial direction of the motor to a first groove 1012 of the first stator lamination 101a and a first central through hole 1011 of the first stator lamination 101b. In another embodiment, the axial through hole 1014 of the first stator lamination 101a is connected to two circumferentially adjacent guide holes 1023 of the second stator lamination 102.

[0139] In one embodiment, Figure 20e shows the mating structure of two second stator laminations 102, one first stator lamination 101a, and two first stator laminations 101b. The two first stator laminations 101b are stacked as shown in Figure 20b. Each axial through hole 1014 is connected to two axial through holes 1014 of the other first stator lamination 101b on both sides of the motor circumferential direction. The multiple axial through holes 1014 of the two first stator laminations 101b can be sequentially connected along the motor circumferential direction to form a circumferential channel. This circumferential channel can be considered as part of the circumferential liquid cooling channel t2 of the stator core 1. Each second groove 1015 of the first stator lamination 101b communicates along the axial direction of the motor with an axial through hole 1014 of another first stator lamination 101b. Each axial through hole 1014 of the first stator lamination 101b communicates with a circumferential through hole 1014 of an adjacent first stator lamination 101a. Each axial through hole 1014 of the first stator lamination 101a communicates with two adjacent guide holes 1023 of the second stator lamination 102. Each guide hole 1023 can be considered as part of the axial liquid cooling channel t1 of the stator core 1. With the structure shown in FIG20e, an interconnected axial liquid cooling channel t1 and a circumferential liquid cooling channel t2 can be formed in the stator core 1.

[0140] Figure 21 illustrates a schematic diagram of the mating structure between a molded part 3 shown in Figure 19 and a portion of the stator core 1 shown in Figure 20e. As shown in Figure 21, this portion of the stator core 1 includes at least one second stator lamination 102, a first stator lamination 101a, and a first stator lamination 101b. Along the radial direction of the motor, a connecting segment 33 of the molded part 3 is arranged adjacent to the first stator lamination 101b, and the connecting segment 33 is accommodated within the central through-hole 1011 of the first stator lamination 101b. Along the axial direction of the motor, the surface of the molded part 3 facing the second stator lamination 102 is arranged adjacent to the first stator lamination 101a. In one embodiment, the connecting segment 33 of the molded part 3 and the first stator lamination 101b are arranged in the same layer, and their thicknesses along the axial direction of the motor can be approximately equal.

[0141] In this process, each connecting hole 1013 of the first stator lamination 101b is connected to a radial flow channel q2 formed by a through groove of the connecting section 33 along the radial direction of the motor, so that the coolant in the connecting hole 1013 can be guided into the axial flow channel q1 enclosed by the embedded section 31.

[0142] In summary, a first stator lamination 101b, configured with a first stator lamination 101a, at least one second stator lamination 102, and an injection molded part 3, provides a partial structure of the stator core 1 along the axial direction of the motor. The exposed section 32 of the injection molded part 3 exposes the end face of the at least one second stator lamination 102 opposite to that of the first stator lamination 101a. The connecting section 33 of the injection molded part 3 exposes the end face of the first stator lamination 101a opposite to that of the at least one second stator lamination 102 and engages with the first central through hole 1011 of the first stator lamination 101b radially with respect to the motor. By engaging another first stator lamination 101b that is circumferentially offset from the first stator lamination 101b, coolant at the outer circumferential surface of the stator core 1 can be guided into each embedded section 31.

[0143] In one embodiment, the first stator lamination 101a can be omitted. That is, a first stator lamination 101b, configured with at least one second stator lamination 102 and an injection-molded part 3, can form a partial structure of the stator core 1 along the motor's axial direction. By using another first stator lamination 101b circumferentially offset from the first stator lamination 101b, coolant at the outer circumferential surface of the stator core 1 can be guided into each embedded section 31. The configuration of the first stator lamination 101a can increase the capacity of the flow channels for coolant flow.

[0144] In summary, the motor 100 provided in this application embodiment has a stator core 1 with two first stator laminations 101b offset circumferentially along the motor. Each first stator lamination 101b is provided with a first stator lamination 101a, at least one second stator lamination 102, and an injection molded part 3 along the motor axis to form a portion of the motor 100. The exposed sections 32 of the two injection molded parts 3 are exposed on the two axial end faces d of the stator core 1, and the two exposed sections 32 can be fitted with an annular end cap 20 to form a receiving cavity S.

[0145] In one embodiment, FIG22 illustrates a cross-section of a portion of the structure of the stator 10. As shown in FIG22, with reference to the structure at one of the axial end faces d of the stator core 1, the stator core 1 includes two first stator laminations 101b that are circumferentially offset along the motor. Multiple axial through holes 1014 of the two first stator laminations 101b can be connected to form at least a portion of a circumferential liquid cooling channel t2 extending circumferentially along the motor. Each guide hole 1023 of the second stator lamination 102 of the stator core 1 can connect the axial end face d with an axial through hole 1014. The guide hole 1023 is at least a portion of the axial liquid cooling channel t1, which connects the circumferential liquid cooling channel t2 with the axial end face d. The through hole g included in the exposed section 32 of the injection molded part 3 is connected to the axial liquid cooling channel t1. The stator core 1 includes two first stator laminations 101b and two first stator laminations 101a, which can connect the outer peripheral surface of the stator core 1 with the connecting hole 1013 to form part of the circumferential liquid cooling channel t2. The circumferential liquid cooling channel t2 can receive coolant from the internal flow channel of the motor housing 100 through the second groove 1015. The connecting hole 1013 is connected to the axial flow channel q1 formed by the radial flow channel q2 of the injection molded part 3 and the embedded section 31. The axial flow channel q1 connects the radial flow channel q2 with the surface of the exposed section 32 of the injection molded part 3 away from the axial end face d. The receiving cavity S formed by the annular cover plate 20 and the exposed section 32 can be connected to the axial liquid cooling channel t1 and the axial flow channel q1. The liquid outlet K on the annular cover plate 20 is connected to the receiving cavity S. Of course, the motor 100 includes a liquid cooling channel on the other side of another axial end face d, similar to the liquid cooling channel shown in Figure 22. This allows for the formation of a sealed liquid cooling cavity where liquid enters radially from the outer periphery of the electronic core 1 and exits through the outlets K of the annular cover plates 20 distributed at both ends along the axial direction of the motor. The coolant in the axial flow channel q1 can immerse and cool the stator winding 2 it contains, and the receiving cavity S can immerse and cool the ends of the stator winding 2, thereby achieving a good cooling effect. In this motor 100, the outer periphery of the stator core 1 does not require an additional liquid cooling channel, which enhances the anti-rotation effect of the stator 10.

[0146] In some embodiments, as shown in FIG23, after the insert section 31 of the injection molded part 3 is inserted into the winding slot 12 along the axial direction of the motor, the insert section 31 may only fill the opening 121 of the winding slot 12 for connecting the center hole 11, and the insert section 31 and the winding slot 12 enclose an axial flow channel q1. When the axial flow channel q1 accommodates the stator winding 2, insulating material such as insulating paper needs to be disposed between the stator winding 2 and the inner wall of the winding slot 12.

[0147] In some embodiments, the annular cover plate 20 can be a structure independent of the stator 10. As shown in Figure 24a, a simplified cross-sectional view of a motor 100 shows the stator core 1, stator winding 2, and injection-molded part 3 of the motor 100, which are then fitted with the annular cover plate 20 and installed within the housing of the motor 100. The housing of the motor 100 includes a motor end cover 41 and a stator sleeve 42. The motor end cover 41 encloses the stator sleeve 42 to form the internal space of the housing. The stator sleeve 42 is used to accommodate and fix the stator core 1; specifically, the outer circumferential surface of the stator core 1 is connected and fixed to the housing 40. The annular cover plate 20 is independent of the housing of the motor 100.

[0148] In some embodiments, the annular cover 20 may be part of the housing of the motor 100. As shown in FIG24b, the annular cover 20 is part of a motor end cover 41, and the annular cover 20 protrudes from the motor end cover 41 along the axial direction of the motor. After the motor end cover 41 surrounds the stator sleeve 42, the annular cover 20 surrounds the outer edge of the inner edge of the exposed section 32 along the radial direction of the motor, thereby forming a receiving cavity S.

[0149] In some embodiments, the annular cover plate 20 may also be part of the housing 40 of the motor 100. As shown in FIG24c, after the motor end cover 41 surrounds the stator sleeve 42, the annular cover plate 20 can mate with the first annular boss 321 of the injection molded part 3. Specifically, the stator sleeve 42, the motor end cover 41, the annular cover plate 20, the exposed section 32, and the axial end face d of the stator core 1 form a receiving cavity.

[0150] In summary, the motor 100 provided in this embodiment of the application, through the cooperation of an annular cover plate 20 and the stator 10, can form a sealed cavity capable of immersing and cooling the stator winding 2, thereby achieving good cooling of the stator winding 2 and improving the continuous power of the motor 100. The injection molded part 3 and the stator core 1 are integrally injection molded. The first annular boss 321 of the injection molded part 3 can increase the creepage distance along the radial direction of the motor between the center hole 11 of the stator core 1 and the stator winding 2, and reduce the creepage distance along the axial direction of the motor, thereby reducing the end height of the stator 10, which is beneficial for miniaturizing the motor 100.

[0151] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A motor with windings immersed in liquid cooling, characterized in that, The motor includes a stator core, stator windings, an annular cover plate, and an integrally injection-molded part; The stator core includes a central hole and multiple winding slots. Each winding slot and the central hole penetrates two axial end faces of the stator core along the axial direction of the motor. The multiple winding slots are arranged at intervals along the circumference of the motor. The multiple winding slots are used to fix the injection molded part and the stator windings. The injection molded part includes multiple embedded sections and one exposed section, wherein: Each of the embedded segments is embedded in a winding slot along the axial direction of the motor, and an exposed segment covers an axial end face of the stator core. The exposed segment includes an annular boss facing away from an axial end face of the stator core along the axial direction of the motor, and the inner diameter of the annular boss is greater than or equal to the inner diameter of the central hole. One end of the stator winding passes through the exposed section along the axial direction of the motor, and the one end of the stator winding surrounds the annular boss along the circumference of the motor. The annular boss is used to enclose the annular cover plate to form a receiving cavity, and the receiving cavity is used to contain coolant that submerges the one end of the stator winding.

2. The motor as described in claim 1, characterized in that, The annular cover plate includes an annular flange. After the annular cover plate surrounds the annular boss, the annular flange is arranged radially between the annular boss and one end of the stator winding.

3. The motor as described in claim 2, characterized in that, Along the axial direction of the motor, the length of the portion of the stator winding passing through the exposed section is greater than the length of the annular boss but less than the length of the annular flange.

4. The motor as described in claim 2 or 3, characterized in that, Along the radial direction of the motor, the inner diameter of one annular flange is larger than the outer diameter of the one annular boss, wherein: The gap between the annular flange and the exposed section is used to fill the sealant.

5. The motor as described in any one of claims 1-4, characterized in that, The annular cover includes one or more outlets for discharging coolant from the receiving cavity. The distance between each outlet and the axis of the annular cover along the radial direction of the motor is greater than the outer diameter of the annular flange.

6. The motor as described in any one of claims 1-5, characterized in that, The exposed section further includes another annular boss, and the annular cover plate is also used to enclose the other annular boss. The other annular boss surrounds the first annular boss along the circumference of the motor. An annular groove is formed between the first annular boss and the other annular boss. The opening of the annular groove faces away from the first axial end face along the axial direction of the motor, wherein: Along the radial direction of the motor, the outer diameter of the other annular boss is less than or equal to the outer diameter of the stator core, and the inner diameter of the other annular boss is greater than or equal to the length of each winding slot.

7. The motor as described in claim 6, characterized in that, The annular cover plate includes another annular flange. After the annular cover plate surrounds the other annular boss, the other annular flange is arranged radially along the motor between the other annular boss and one end of the stator winding. The gap between the other annular flange and the exposed section is used to fill the gap with sealing material.

8. The motor as described in claim 6 or 7, characterized in that, Along the axial direction of the motor, the length of one annular boss is greater than the length of the other annular boss, but less than the length of the portion of the stator winding that passes through the exposed section.

9. The motor according to any one of claims 1-8, characterized in that, The motor includes multiple axial flow channels, each of which is used to transport coolant to cool the stator windings embedded in the winding slots; The motor includes a plurality of radial flow channels, each of which communicates with an axial flow channel along the radial direction of the motor.

10. The motor as described in claim 9, characterized in that, The stator winding includes multiple flat wires, each embedded section is used to form an axial flow channel, and the multiple flat wires contained in each winding slot are arranged radially in the axial flow channel. Each axial channel is used to deliver coolant to directly cool the multiple flat wires contained in the winding slot into which it is embedded.

11. The motor as described in claim 9 or 10, characterized in that, Each of the axial flow channels is used to connect to at least one radial flow channel in one of the receiving cavities or the stator core, and each of the radial flow channels receives coolant through an internal flow channel in the motor housing; The outer diameter of an exposed section along the radial direction of the motor is greater than the length of each winding slot. The exposed section includes a plurality of through holes, each of which extends through the exposed section along the axial direction of the motor, wherein: One end of the stator winding accommodated in each of the winding slots passes through one of the through holes, and each of the axial flow channels connects to the accommodating cavity through one of the through holes.

12. The motor according to any one of claims 1-11, characterized in that, Along the radial direction of the motor, the outer diameter of each of the embedded segments is less than or equal to the outer diameter of the exposed segment.

13. The motor according to any one of claims 1-12, characterized in that, The motor housing includes a motor end cover and a stator sleeve. The stator sleeve is used to accommodate and fix the stator core. The motor end cover is used to enclose the stator sleeve. The motor end cover includes an annular cover plate, wherein: After the motor end cover surrounds the stator sleeve, the annular cover plate and the exposed section surround the receiving cavity.

14. A powertrain, characterized in that, The powertrain includes a reducer or a transmission and an electric motor as described in any one of claims 1-13, wherein the output shaft of the electric motor is coaxially connected to the input shaft of the reducer or the transmission.

15. A vehicle, characterized in that, The vehicle includes wheels, a transmission mechanism, and a powertrain as described in claim 14, the powertrain driving the wheels via the transmission mechanism.

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