Immersion liquid cooling motor, power assembly and vehicle

Abstract

The invention relates to the technical field of motors, in particular to an immersion liquid cooling motor, a power assembly and a vehicle. A stator of the motor comprises a stator iron core, a stator winding and an annular injection molding body which is integrally formed through injection molding, the annular injection molding body comprises a plurality of embedded sections and an exposed section, the exposed section and the embedded sections are adjacently arranged in the axial direction of the motor, each embedded section is used for being embedded into a winding groove in the radial direction of the motor, and the exposed section is used for being embedded into the winding groove in the radial direction of the motor. One exposed section is exposed out of one axial end face in the axial direction of the motor, one exposed section is used for surrounding one motor end cover, one stator sleeve and one axial end face form one containing cavity, and one containing cavity is used for containing cooling liquid to immerse one end of the stator winding. The annular injection molding body is fixedly connected with the motor end cover of the motor shell, so that the accommodating cavity can be formed between one end part of the stator and the shell, the end winding of the stator winding is subjected to immersion liquid cooling, the cooling effect on the stator winding is enhanced, and the power of the motor is improved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to an immersion liquid-cooled motor, a powertrain, and a vehicle. Background Art

[0002] The loss of the motor stator winding is an important source of heat in the motor, which will affect the motor efficiency. Passing oil or water through the motor stator can reduce the temperature of the winding, thereby reducing the heat loss of the motor and improving the motor efficiency.

[0003] However, the current heat dissipation method of the motor cannot meet the needs of motor miniaturization and high continuous power requirements. Summary of the invention

[0004] The present application provides an immersion liquid-cooled motor, a powertrain and a vehicle. The motor is formed by injection molding a stator core and an annular injection molding body to form a structure that can directly immerse the winding in liquid for cooling, thereby enhancing the cooling effect of the motor and meeting the power requirements of the motor.

[0005] In a first aspect, an embodiment of the present application provides an immersion liquid-cooled motor, the housing of the motor comprising a stator sleeve and a motor end cover, the stator sleeve being used to fix the stator of the motor, the motor end cover being used to enclose a stator sleeve to form a motor cavity, and the motor cavity being used to accommodate the stator and rotor of the motor; the stator comprising a stator core, a stator winding and an integrally injection-molded annular injection molding body, the stator core comprising a center hole and a plurality of winding slots, the center hole penetrating the stator core along the axial direction of the motor, the plurality of winding slots being arranged at intervals along the circumferential direction of the motor stator, and each winding slot being radially spaced from the center of the motor stator. The holes are connected, wherein: a plurality of winding slots are used to fix the stator winding and the annular injection molding body, one end of the stator winding is exposed at an axial end face of the stator core along the axial direction of the motor; the annular injection molding body includes a plurality of embedded sections and an exposed section, an exposed section and the plurality of embedded sections are arranged adjacently along the axial direction of the motor, each embedded section is used to embed a winding slot along the radial direction of the motor, an exposed section is exposed at an axial end face along the axial direction of the motor, an exposed section is used to enclose a motor end cover, a stator sleeve and an axial end face to form an accommodating cavity, and an accommodating cavity is used to accommodate one end of the stator winding immersed in coolant.

[0006] In the motor provided in the embodiment of the present application, the annular injection molding body is connected and fixed to the motor end cover of the motor housing, so that a receiving cavity can be formed between one end of the stator and the housing, and the end of the stator winding can extend into the receiving cavity. The receiving cavity is filled with coolant, and the coolant can immerse the stator winding accommodated in the receiving cavity to achieve direct cooling of the stator winding end winding. The exposed section of the annular injection molding body is directly connected and fixed to the housing, which can shorten the end height of the stator, which is conducive to miniaturization of the motor. Compared with the spray ring end winding cooling scheme in the prior art, the structure is simpler and the cooling effect is better, which can reduce production costs and increase the continuous power of the motor.

[0007] In one embodiment, along the circumferential direction of the motor, the inner width of each winding slot is greater than the slot width of the slot for connecting the winding slot to the center hole, and the embedded segment embedded in each winding slot fills the slot of each winding slot. The embedded end is fixed in a manner of filling the slot of the winding slot, which can strengthen the connection and fixation between the annular injection molding body and the stator core.

[0008] In one embodiment, along the radial direction of the motor, the length of an embedded segment embedded in each winding slot is less than or equal to the length of the slot, which can save materials, reduce production costs, and reduce the weight of the motor while ensuring the bonding strength between the embedded segment and the winding slot.

[0009] In one embodiment, along the radial direction of the motor, an embedded segment embedded in each winding slot surrounds the stator winding accommodated in the winding slot along the inner wall of the winding slot, which can strengthen the connection and fixation between the embedded segment and the winding slot.

[0010] In one embodiment, an exposed segment is used to cover a portion of the axial end face, and the outer diameter of the portion of the exposed segment covering an axial end face is greater than the diameter of a center hole, which can strengthen the connection and fixation between the annular injection molded body and the stator core along the radial direction of the motor.

[0011] In one embodiment, along the radial direction of the motor, the outer diameter of a portion of an exposed segment covering an axial end surface is smaller than the distance between the stator winding in each winding slot and the axis of the motor. The exposed segment is arranged along the radial direction of the motor between the stator winding and the center hole, which can increase the creepage distance of the stator winding.

[0012] In one embodiment, the outer diameter of a portion where an exposed section covers an axial end face is greater than the distance between the bottom of each winding slot and the axis of the motor, and one end of the stator winding passes through a portion where an exposed section covers an axial end face along the axial direction of the motor and is exposed to an axial end face of the stator core. The exposed section can cover a larger range of the axial end face of the stator core, so that the annular injection molding body and the stator core are more tightly combined and fixed.

[0013] In one embodiment, a portion of an exposed section covering an axial end face includes a plurality of through holes, the plurality of through holes are arranged at intervals along the circumference of the motor, each through hole penetrates an exposed section along the axial direction of the motor and is connected to a winding slot, wherein: the size of each through hole along the radial direction of the motor is greater than or equal to the size of each winding slot, and the distance between two adjacent through holes along the circumference of the motor is less than or equal to the distance between two corresponding adjacent winding slots. The through hole can connect the winding slot with the space on the side of the exposed section away from the stator core, so that the accommodating cavity is connected to the winding slot, and the coolant in the accommodating cavity can enter the winding slot to cool the stator winding.

[0014] In one embodiment, along the radial direction of the motor, a portion of an exposed section covering an axial end surface includes a plurality of through holes, each through hole penetrates a portion of an exposed section covering an axial end surface along the axial direction of the motor, and each through hole is arranged between two winding slots. The provision of the through holes can reduce the amount and weight of the annular injection molding body.

[0015] In one embodiment, the exposed section of the annular injection molding may have only through holes. Alternatively, the exposed section of the annular injection molding may have both through holes and through holes. Alternatively, the exposed section of the annular injection molding covers the portion between the winding slots on the axial end surface of the stator core, in which case the exposed section may only include through holes.

[0016] In one embodiment, along the radial direction of the motor, each through hole includes a notch, and the notch of each through hole faces away from a center hole along the radial direction of the motor. The width of each notch along the circumferential direction of the motor is greater than the width of each winding slot, so that circumferentially adjacent notches can be connected to form an exposed section with a smaller radial dimension.

[0017] In one embodiment, the stator core includes one or more liquid cooling channels, and a portion of an exposed section covering an axial end surface includes a plurality of liquid cooling holes, each liquid cooling hole is used to connect a accommodating cavity and at least one liquid cooling channel, so that the accommodating cavity can be connected to the at least one liquid cooling channel to form a liquid cooling system for the motor.

[0018] In one embodiment, an exposed section further includes an annular section, a motor end cover includes an annular protrusion and a bearing groove, an annular protrusion surrounds a bearing groove, wherein: an annular protrusion is used to extend into the center hole of an annular section along the axial direction of the motor, a gap between the outer circumference of an annular boss and the inner circumference of an annular section is used to accommodate a sealing ring; a bearing groove is used to fix the outer ring of a bearing, and the inner ring of a bearing is used to drive the motor shaft connected to the motor. The annular section of the exposed section can be positioned and matched with the annular protrusion to realize the connection and fixation of the annular injection molding body and the motor end cover, thereby reducing the axial size of the motor.

[0019] In one embodiment, along the axial direction of the motor, the length of an annular segment exposed from an axial end surface is greater than the length of an annular protrusion protruding from a motor end cover. The end of the annular segment can abut against the motor end cover, and a structure such as adhesive can be added between the two to achieve an axial sealing connection between the motor end cover and the annular injection molding body.

[0020] In a second aspect, an embodiment of the present application provides a power assembly, which includes a reducer or a transmission and any one of the motors provided in the first aspect above, and the output shaft of the motor is coaxially connected to the input shaft of the reducer or the transmission.

[0021] In a third aspect, an embodiment of the present application provides a vehicle, the vehicle comprising wheels, a transmission mechanism, and a powertrain as provided in the second aspect above, wherein the powertrain drives the wheels through the transmission mechanism. The vehicle may be an electric vehicle or a hybrid vehicle, and the application of the powertrain is conducive to ensuring the smooth and safe driving of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0024] Figure 3a A schematic diagram of the structure of a motor provided in an embodiment of the present application;

[0025] Figure 3b An exploded diagram of a motor provided in an embodiment of the present application;

[0026] Figure 3c A schematic cross-sectional structure diagram of a motor provided in an embodiment of the present application;

[0027] Figure 4 A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0028] Figure 5a A schematic structural diagram of an annular injection molded body and a stator core of a motor provided in an embodiment of the present application;

[0029] Figure 5b A schematic diagram of a partial cross-sectional structure of a ring-shaped injection molded body and a winding slot of a motor provided in an embodiment of the present application;

[0030] Figure 6 A schematic diagram of the structure of a stator of a motor provided in an embodiment of the present application;

[0031] Figure 7A schematic cross-sectional diagram of a portion of the structure of a stator and a housing of a motor provided in an embodiment of the present application;

[0032] Figure 8a An exploded diagram of a motor provided in an embodiment of the present application;

[0033] Figure 8b A schematic cross-sectional structure diagram of a motor provided in an embodiment of the present application;

[0034] Fig. 9 A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0035] Fig.10a A schematic structural diagram of an annular injection molded body and a stator core of a motor provided in an embodiment of the present application;

[0036] Fig.10b A schematic diagram of a partial cross-sectional structure of a ring-shaped injection molded body and a winding slot of a motor provided in an embodiment of the present application;

[0037] Fig.11 A schematic diagram of the structure of a stator of a motor provided in an embodiment of the present application;

[0038] Fig.12 A schematic cross-sectional diagram of a portion of the structure of a stator and a housing of a motor provided in an embodiment of the present application;

[0039] Fig.13a A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0040] Fig.13b A schematic cross-sectional diagram of a portion of the structure of a stator and a housing of a motor provided in an embodiment of the present application;

[0041] Fig.14a A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0042] Fig.14b A schematic cross-sectional diagram of a portion of the structure of a stator and a housing of a motor provided in an embodiment of the present application;

[0043] Fig.15 A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0044] Fig.16 A schematic diagram of the structure of a stator core of a motor provided in an embodiment of the present application;

[0045] Fig.17 A schematic structural diagram of an annular injection molded body of a motor provided in an embodiment of the present application;

[0046] Fig.18aA schematic diagram of the structure of the cooperation between the annular injection molded body and the stator core of a motor provided in an embodiment of the present application;

[0047] Fig.18b for Fig.18a A magnified view of the details at the middle V;

[0048] Fig.19a A schematic diagram of a partial cross-sectional structure of a ring-shaped injection molded body and a stator core of a motor provided in an embodiment of the present application;

[0049] Fig.19b A schematic diagram of a partial cross-sectional structure of a ring-shaped injection molded body and a stator core of a motor provided in an embodiment of the present application;

[0050] Fig. 20 A schematic cross-sectional diagram of the partial structure of a stator and a housing of a motor provided in an embodiment of the present application.

[0051] Reference numerals:

[0052] 1000-powertrain; 2000-transmission mechanism; 3000-wheel;

[0053] 100-motor; 200-motor controller; 300-reducer;

[0054] 10-stator; 20-housing; 201-stator sleeve; 202-motor end cover; 2021-annular protrusion; 2022-bearing groove; 30-rotor; 301-bearing;

[0055] 1- stator core; 11- center hole; 12- winding slot; 121- slot; 101- first stator punching sheet; 102- second stator punching sheet; 2- stator winding;

[0056] 3-annular injection molding body; 31-embedded section; 32-exposed section; 321-annular section; 322-extended section;

[0057] K-liquid outlet; S-accommodating cavity; d-axial end face; g-through hole; j-liquid inlet; n-liquid cooling hole; t1-axial liquid cooling channel; t2-circumferential liquid cooling channel; p-through hole; q1-axial flow channel; q2-radial flow channel. DETAILED DESCRIPTION

[0058] In recent years, environmental pollution and energy shortages have accelerated the development and utilization of green renewable energy. Electric vehicles are becoming more and more popular with users due to their advantages of low pollution, low noise, and high energy efficiency, and their market share is also increasing year by year. The stator winding of the drive motor is energized to generate a rotating magnetic field, which interacts with the rotor magnetic field to generate torque and drive the electric vehicle to move. The stator winding of the existing drive motor is generally a round wire winding or a flat wire winding, and its cooling methods include casing water cooling and oil spray cooling. Specifically, casing water cooling is to arrange a water channel in the casing outside the stator, and the heat of the stator winding is transferred to the casing radially through the stator core after the insulation of the winding slot for cooling, which is an indirect cooling method. Oil spray cooling is to arrange oil spray rings or oil pipes at the ends of both sides of the motor stator winding, spray oil to cool the end winding and take away the heat of the stator winding, which is a direct cooling method. Compared with casing water cooling, the end oil spray method reduces the thermal resistance between the winding and the coolant, which can improve the cooling effect and continuous power. With the miniaturization of motors and the increasing demand for continuous power, the heat dissipation and cooling effect of motors needs to be further improved.

[0059] Based on this, the embodiments of the present application provide an immersion liquid-cooled motor, powertrain and vehicle, in which the stator winding of the motor can be immersed in liquid cooling, thereby achieving a better liquid cooling effect, which is beneficial to the miniaturization of the motor and the improvement of continuous power.

[0060] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0061] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, the vehicle is a wheeled device driven or towed by a power device, such as a pure electric vehicle / batteryelectric vehicle (pure EV / battery EV), a hybrid electric vehicle (HEV), a range extended electric vehicle (REEV) or a plug-in hybrid electric vehicle (PHEV). The vehicle includes a powertrain 1000, a transmission mechanism 2000 and a wheel 3000. The powertrain 1000 drives the wheel 3000 through the transmission mechanism 2000. The powertrain 1000 is used to convert electrical energy into mechanical energy. The transmission mechanism 2000 is used to transmit and connect the powertrain 1000 and the wheel 3000. Of course, the vehicle also includes a frame that withstands the environmental loads inside and outside the vehicle and a battery for supplying power to the powertrain 1000.

[0062] Figure 2 This is a schematic diagram of the structure of the powertrain 1000 provided in the embodiment of the present application. Figure 2 As shown, 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 direct current provided by the battery into alternating current, and transmit the alternating current 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 wheel 3000 of the vehicle through the reducer 300. The reducer 300 can also be called a transmission. The motor 100 of the electric vehicle is usually a permanent magnet synchronous or AC asynchronous motor.

[0063] During the operation of the motor, the resistance generated by the current flowing through the flat wire winding of the motor 100 will cause energy loss, and the lost energy will be converted into heat, causing the temperature of the flat wire winding to continue to rise. If the flat wire winding cannot be cooled in time, it will not only shorten the service life of the flat wire winding, but also reduce the working efficiency of the motor, and there is a risk of causing electrical failures and safety accidents.

[0064] Figure 3a The motor 100 provided in the embodiment of the present application includes a housing 20 and a stator 10 and a rotor 30 accommodated in the housing 20. Parts of the stator 10 and the rotor 30 are accommodated in the housing 20 and are hidden and not shown. The rotor shaft of the rotor 30 extends out of the housing 20 along the axial direction of the motor for outputting power. It can be understood that the rotor shaft of the rotor 30 is also equivalent to the motor shaft of the motor 100. For the convenience of illustration, the axial direction of the motor 100 is referred to by the abbreviation A.

[0065] Figure 3b FIG. 1 is an exploded view of the motor 100. Figure 3b As shown, the housing 20 of the motor 100 includes a stator sleeve 201 and a motor end cover 202. In one embodiment, the stator sleeve 201 is a cylindrical structure with one end open, and the motor end cover 202 is similar to a circular plate. The motor end cover 202 is used to cooperate and fix with the open end of the stator sleeve 201 to enclose and form a motor cavity. In some embodiments, the housing 20 may include a stator sleeve 201 and two motor end covers 202. The stator sleeve 201 is a cylindrical structure with two ends open, and the two motor end covers 202 may also be respectively cooperated and fixed at the two end openings of the stator sleeve 201 to enclose and form a motor cavity.

[0066] based on Figure 3bAs shown, a part of the stator 10 and the rotor 30 can be accommodated in the motor cavity of the housing 20. The stator 10 includes a stator core 1, a stator winding 2 and an annular injection molding body 3. The stator winding 2 can be a flat wire winding or a round wire winding. The present application does not limit the specific structural form of the stator winding 2. The stator winding 2 is simplified here. The annular injection molding body 3 is an integrated injection molding structure. Among them, the stator winding 2 and the annular injection molding body 3 are fixed to the stator core 1. The rotor 30 can be rotatably mounted on the housing 20 at both ends along the axial direction of the motor around the axis of the motor 100, and the stator 10 can form a magnetic field that can drive the rotor 30 to rotate.

[0067] In the embodiments of the present application, 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.

[0068] In one embodiment, the surface of the motor end cover 202 facing the stator sleeve 201 includes an annular protrusion 2021 and a bearing groove 2022, and the annular protrusion 2021 surrounds the bearing groove 2022. The annular protrusion 2021 is used to cooperate with the stator 10 along the axial direction of the motor, and the bearing groove 2022 is used to drive and connect the rotor shaft of the rotor 30 through a bearing 301. Specifically, the outer ring of the bearing 301 is fixed in the bearing groove 2022, and the inner ring of the bearing 301 is driven and connected to the rotor shaft of the rotor 30.

[0069] When the motor 100 is assembled, Figure 3c The cross-sectional structure diagram of a motor 100 is shown, in which the outer peripheral surface of the stator core 1 of the stator 10 is fixed to the inner wall of the stator sleeve 201 by gluing or the like, and the axial ends of the rotor 30 are rotatably mounted on the motor end cover 202 and the stator sleeve 201 through bearings 301 respectively. The housing 20 can provide certain protection for the stator 10 and the rotor 30, and also provide positioning and support for the installation of the stator 10 and the rotor 30. Along the axial direction of the motor, one axial end of the stator 10 is adjacent to a motor end cover 202 along the axial direction of the motor, and the other axial end of the stator 10 is adjacent to one end of the stator sleeve 201 away from the motor end cover 202 along the axial direction of the motor. Among them, one end of the annular injection molding body 3 of the stator 10 is connected to the annular protrusion 2021 of the motor end cover 202, so that one end of the stator 10 and the motor end cover 202 can enclose a receiving chamber R, and the receiving chamber R can contain cooling liquid to immerse the end of the liquid-cooled stator winding 2 on this side. The accommodating cavity R can immerse the end of the stator winding 2 in liquid cooling, thereby improving the winding cooling effect of the motor 100, improving the efficiency of the motor 100 and the safety performance of the equipment using the motor 100. In one embodiment, the coolant is any one of ethylene glycol cooling oil, synthetic oil and mineral oil.

[0070] In some embodiments, the other end of the annular injection molded body 3 of the stator 10 is connected to the stator sleeve 201, so that the other end of the stator 10 and the motor end cover 202 can be enclosed to form another accommodating cavity R, and the accommodating cavity R can contain coolant to immerse the end of the other side of the liquid-cooled stator winding 2, thereby immersing the two ends of the stator winding 2 in liquid cooling respectively.

[0071] The motor 100 provided in the embodiment of the present application forms a space at the end of the stator 10 for immersing the end of the stator winding 2 in liquid cooling, eliminating the structure of the end cooling such as the oil spray ring, and can shorten the end height of the stator 10, which is conducive to miniaturization of the motor 100. Compared with the prior art, the structure is simpler, the cooling effect is better, the manufacturing cost can be reduced, and the continuous power of the motor 100 can be increased.

[0072] It should be understood that along the axial direction of the motor, one end of the stator winding 2 is a welding end and the other end is a cross-line end, and the welding end of the stator winding 2 is generally used for current collection and routing. In order to adapt to the different structures at both ends of the stator winding 2, the shapes of the corresponding motor end cover 202 and the stator sleeve 201 need to be adjusted accordingly, which will not be described in detail here.

[0073] The following embodiments will take a motor end cover 202 and a stator 10 that cooperate to form a receiving cavity S as an example to exemplarily introduce the technical solution provided in the embodiment of the present application that the motor 100 can immerse the end of the stator winding 2.

[0074] Figure 4 The structure of the annular injection molded body 3 of the stator 10 provided in the embodiment of the present application is as follows. Figure 4 As shown, the annular injection molding body 3 is an annular structure that can be adapted to the stator core 1. In one embodiment, the annular injection molding body 3 includes two exposed segments 32 and multiple embedded segments 31 connected between the two exposed segments 32. With reference to one end of the annular injection molding body 3 along the axial direction of the motor, the annular injection molding body 3 includes an exposed segment 32 and multiple embedded segments 31 arranged adjacent to each other along the axial direction of the motor, the exposed segment 32 is cylindrical, and multiple embedded segments 31 are formed on one side of the exposed segment 32 along the axial direction of the motor. The multiple embedded segments 31 included in the annular injection molding body 3 are arranged at intervals along the circumference of the motor. Along the radial direction of the motor, the outer diameter of each embedded segment 31 is substantially consistent with the outer diameter of the exposed segment 32. In the production and manufacturing of the motor 100, the annular injection molding body 3 is formed by integral injection molding, and the exposed segment 32 and the multiple embedded segments 31 are an integral structure, and the structural division here is only for structural description. Among them, the exposed segment 32 is annular, and the exposed segment 32 can be considered as an annular segment.

[0075] Figure 5a for Figure 4The schematic diagram of the matching structure of the annular injection molding body 3 and the stator core 1 is shown in FIG. Figure 5a As shown, the stator core 1 includes a center hole 11 and a plurality of winding slots 12, and the center hole 11 is used to accommodate the rotor of the motor 100. Along the axial direction of the motor, the center hole 11 and each winding slot 12 penetrate the stator core 1, and the plurality of winding slots 12 are arranged at intervals along the circumference of the motor, and the plurality of winding slots 12 are used to fix the annular injection molding body 3 and the stator winding 2. During the preparation process of the motor 100, the annular injection molding body 3 is integrally injection-molded and fixed to the stator core 1 through an in-mold injection molding process. Each embedded section 31 of the annular injection molding body 3 is embedded in a winding slot 12 along the axial direction of the motor and fixed, and an exposed section 32 is exposed to an axial end face d of the stator core 1 along the axial direction of the motor. Along the axial direction of the motor, the exposed section 32 protrudes from the axial end face d of the stator core 1. Along the radial direction of the motor, the outer diameter of the exposed section 32 is larger than the diameter of the central hole 11 of the stator core 1 . The exposed section 32 can partially cover the axial end surface d of the stator core 1 , thereby strengthening the connection and fixation between the annular injection molding body 3 and the stator core 1 .

[0076] Figure 5b It is a partial cross-sectional structure of the embedded section 31 of the annular injection molding body 3 after being embedded in the winding slot 12 along the radial direction of the motor. Figure 5b As shown, the slot width of each winding slot 12 is greater than the slot width of the slot 121 of the winding slot 12 for connecting to the center hole 11, and the embedded section 31 can only be filled in the opening 121 of the winding slot 12 for connecting to the center hole 11 to achieve fixation, and the embedded section 31 and the winding slot 12 can be enclosed to form a space for accommodating the stator winding 2. When the stator winding 2 is accommodated in the winding slot 12, insulating materials such as insulating paper need to be arranged between the stator winding 2 and the inner wall of the winding slot 12. The embedded section 31 fills the slot 121 of the winding slot 12 along the radial direction of the motor. On the premise of isolating the winding slot 12 from the center hole 11, it can save materials and reduce the weight of the motor 100, which is conducive to the miniaturization of the motor 100. For the convenience of illustration, the circumferential direction of the motor 100 is referred to by the abbreviation C.

[0077] In one embodiment, the embedded section 31 of the annular injection molding body 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 to affect the assembly of the stator 10 and the rotor.

[0078] Figure 6 The structure of the stator 10 is illustrated as follows. Figure 6As shown, the stator winding 2 is wound on the stator core 1 and then extends out of an axial end face d of the stator core 1. Along the axial direction of the motor, the height at which the end winding of the stator winding 2 is exposed on the one axial end face d is lower than the height at which the exposed section 32 is exposed on the axial end face d. Along the radial direction of the motor, the outer diameter of the portion of the exposed section 32 covering the axial end face d of the stator core 1 is smaller than the distance between the stator winding 2 and the axis of the motor 100 in each winding slot 12. When the exposed section 32 is mated and connected to the housing 20, it will not affect the stator winding 2. In some embodiments, the structure of the stator winding 2 and the annular injection molding body 3 at the other axial end face d of the stator core 1 can be the same as that of the housing 20. Figure 6 The structure shown is similar.

[0079] Figure 7 This is a schematic cross-sectional view of a portion of the structure of the motor 100 provided in the embodiment of the present application. The cross-section passes through a winding slot 12 of a stator core 1 and an embedded section 31 embedded in the winding slot 12 along the radial direction of the motor. The rotor 30 is not shown here. Figure 7 As shown, taking a winding slot 12 as an example, an embedded section 31 of the annular injection molding body 3 is embedded in the notch of the winding slot 12 along the radial direction of the motor to enclose a space for accommodating the stator winding 2, and the exposed section 32 exposes the axial end face d of the stator core 1, and the division between the embedded section 31 and the exposed section 32 is shown by a dotted line. The stator winding 2 is partially accommodated in the winding slot 12 and extends out of an axial end d of the stator core 1 along the axial direction of the motor. The part of the stator winding 2 exposed from the axial end face d of the stator core 1 can be considered as the end winding of the stator winding 2, and the stator winding 2 is isolated from the winding slot 12 and the embedded section 31 by the insulating paper 4. Along the radial direction of the motor, the exposed section 32 is arranged between the stator winding 2 and the center hole 11, and the outer diameter of the exposed section 32 is smaller than the distance between the stator winding 2 and the axis of the motor 100, and the exposed section 32 will not affect the end of the stator winding 2 extending out of the stator core 1. The exposed section 32 is used to isolate the stator winding 2 and the center hole 11. The exposed section 32 extends a certain height along the axial direction of the motor, which can increase the creepage distance between the center hole 11 and the stator winding 2, thereby improving the safety of the motor 100. Along the axial direction of the motor, the height of the exposed section 32 protruding from the axial end surface d of the stator core 1 is greater than the height of the axial end surface d of the stator winding 2 exposed from the stator core 1. When the exposed section 32 cooperates with the motor end cover 202, the motor end cover 202 will not contact the end of the stator winding 2.

[0080] Please continue to refer to Figure 7As shown, an annular protrusion 2021 of the motor end cover 202 extends into the inner ring of an exposed section 32 along the axial direction of the motor, and the exposed section 32 and the annular protrusion 2021 are arranged adjacent to each other along the radial direction of the motor. The inner circumference of the exposed section 32 is used to cooperate and fix with the outer circumference of the annular protrusion 2021 along the radial direction of the motor. In some embodiments, the distance between the outer circumference of the annular boss 2021 and the axis of the motor 100 is smaller than the distance between the inner circumference of the exposed section 32 and the axis of the motor 100, and the gap between the outer circumference of the annular boss 2021 and the inner circumference of the annular section 321 is used to accommodate a sealing ring to enhance the sealing and fixing effect between the two. An accommodating cavity S is formed between the motor end cover 202 and an axial end face d of the stator core 1, and 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 and extends into the accommodating cavity S.

[0081] In some embodiments, along the axial direction of the motor, the length of the exposed section 32 exposed from an axial end face d is greater than the length of an annular protrusion 2021 protruding from a motor end cover 202. The end of the exposed section 32 facing the motor end cover 202 abuts against the motor end cover 202, thereby realizing the axial connection between the annular injection molding body 3 and the motor end cover 202. The length of the portion of the stator winding 2 passing through the exposed section 32 is less than the length of the annular protrusion 321, and the motor end cover 202 will not contact the end of the stator winding 2, thereby ensuring the function of the stator winding 2. In some embodiments, materials such as adhesives can be filled between the motor end cover 202 and the end of the exposed section 32 facing the motor end cover 202 to enhance the sealing and fixation between the two along the axial direction of the motor.

[0082] Figure 8a The exploded view of another motor 100 is shown in FIG. Figure 3b The annular injection-molded body 3 of the electric motor 100 shown is designed differently.

[0083] When the motor 100 is assembled, Figure 8b The schematic diagram of the cross-sectional structure of a motor 100 is shown, in which, along the axial direction of the motor, one end of the annular injection molding body 3 of the stator 10 that is exposed to the axial end face d of the stator core 1 is connected to the annular protrusion 2021 of the motor end cover 202, so that one end of the stator 10 and the motor end cover 202 can enclose a receiving cavity S, and the receiving cavity S can contain coolant to immerse the end of the liquid-cooled stator winding 2 on this side. In one embodiment, the portion of the annular injection molding body 3 that is exposed to the axial end face d of the stator core 1 along the axial direction of the motor extends along the radial direction of the motor, so that the annular injection molding body 3 can partially cover the axial end face d of the stator core 1. The portion of the stator winding 2 that is exposed to the stator core 1 passes through the annular injection molding body 3 and enters the receiving cavity S.

[0084] Fig. 9The structure of the annular injection molded body 3 of the stator 10 provided in the embodiment of the present application is as follows. Fig. 9 As shown, the annular injection molding body 3 includes two exposed sections 32 and a plurality of embedded sections 31 connected between the two exposed sections 32. The multiple embedded sections 31 included in the annular injection molding body 3 are arranged at intervals along the circumference of the motor, and 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. In one embodiment, each embedded section 31 is in the shape of a pipe. With reference to one end of the annular injection molding body 3 along the axial direction of the motor, the exposed section 32 includes an annular section 321 and an extension section 322, the extension section 322 extends along the radial direction of the motor and is connected to each embedded section 31, the annular section 321 extends along the axial direction of the motor, and a step is formed between the outer peripheral surface of the annular section 321 and the surface of the extension section 322 away from the multiple embedded sections 31. Along the circumference of the motor, the channel formed by the enclosure of each embedded section 31 is connected to one side of the outer peripheral surface of the annular section 321.

[0085] In one embodiment, the extension section 322 of the exposed section 32 includes a plurality of through holes g, which are arranged at intervals along the circumference of the motor, and each through hole g penetrates the extension section 322 along the axial direction of the motor to communicate with the internal space of an embedded section 31 .

[0086] Fig.10a for Fig. 9 The schematic diagram of the matching structure of the annular injection molding body 3 and the stator core 1 is shown in FIG. Fig.10a As shown, the annular injection molding body 3 is integrally injection-molded and fixed to the stator core 1 through an in-mold injection molding process, and each embedded section 31 of the annular injection molding body 3 is embedded and fixed in a winding slot 12 along the axial direction of the motor, and an exposed section 32 is exposed at an axial end face d of the stator core 1 along the axial direction of the motor. Taking an axial end face d of the stator core 1 as an example, the annular section 321 of the exposed section 32 extends along the axial direction of the motor to expose the axial end face d of the stator core 1, and the extended section 322 of the exposed section 32 extends along the radial direction of the motor and partially covers the axial end face d of the stator core 1. Along the axial direction of the motor, the height of the annular section 321 exposed at the axial end face d of the stator core 1 is greater than the height of the extended section 322 exposed at the axial end face d of the stator core 1. Along the radial direction of the motor, the outer diameter of the extension section 322 is greater than the distance between the bottom of the winding slot 12 and the axis of the motor 100 and is less than or equal to the radial dimension of the outer circumference of the stator core 1. It can also be considered that the outer circumference of the extension section 322 is located between the outer circumference of the stator core 1 and the bottom of the winding slot 12. Fig.10b It is a partial cross-sectional structure of the embedded section 31 of the annular injection molding body 3 after being embedded in the winding slot 12 along the radial direction of the motor. Fig.10bAs shown, when an embedding section 31 of the annular injection molding body 3 is embedded in a corresponding winding slot 12 of the stator core 1, the embedding section 31 extends along the slot wall of the winding slot 12 to cover the inner wall of the winding slot 12 and fill the opening 121 of the winding slot 12 for connecting to the center hole 11. The channel enclosed by the embedding section 31 is isolated from the center hole 11, and the space enclosed by the embedding section 31 is used to accommodate the stator winding 2.

[0087] In one embodiment, in combination with reference Fig.10a and Fig.10b In the radial direction of the motor, the size of each through hole g is greater than or equal to the size of each winding slot 12, and the distance between two adjacent through holes g in the circumferential direction of the motor is less than or equal to the distance between two corresponding adjacent winding slots 12. The through hole g with a larger size can avoid the stator winding 2 protruding from the winding slot 12 while connecting the internal space of an embedded section 31.

[0088] 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 size of the space enclosed by the embedded segment 31 is smaller than the cross-sectional size 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 is 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.

[0089] Fig.11 The structure of the stator 10 is illustrated as follows. Figure 1 As shown, when the stator winding 2 is wound on the stator core 1, the stator winding 2 extends out of an axial end face d of the stator core 1 through the embedded section 31, and the end of the stator winding 2 is exposed through the through hole g of the extension section 322. Along the radial direction of the motor, the size of each through hole g is greater than or equal to the size of each winding slot 12, and the through hole g will not hinder the extension of the stator winding 2. Along the circumferential direction of the motor, the distance between two adjacent through holes g is less than or equal to the distance between two corresponding adjacent winding slots 12. Along the axial direction of the motor, the height at which the end winding of the stator winding 2 is exposed on the one axial end face d is lower than the height at which the annular section 321 of the exposed section 32 is exposed on the axial end face d. In some embodiments, the structure of the stator winding 2 and the annular injection molding body 3 at the other axial end face d of the stator core 1 can be the same as that of the annular injection molding body 3 at the other axial end face d of the stator core 1. Fig.11 In the stator 10 , the embedded segment 31 can act as an insulating material barrier between the stator winding 2 and the winding slot 12 of the stator core 1 , without the need for additional insulating material such as insulating paper.

[0090] Fig.12This is a schematic cross-sectional view of a portion of the structure of the motor 100 provided in the embodiment of the present application. The cross-section passes through a winding slot 12 of a stator core 1 and an embedded section 31 embedded in the winding slot 12 along the radial direction of the motor. The rotor 30 is not shown here. Fig.12 As shown, taking a winding slot 12 as an example, an embedded section 31 of the annular injection molding body 3 is embedded in the winding slot 12 along the radial direction of the motor and covers the inner wall of the winding slot 12, and the inner wall of the embedded section 31 encloses a space for accommodating the stator winding 2. The stator winding 2 is exposed through the embedded section 31 and the extended section 322 of the exposed section 32 along the axial direction of the motor. The portion of the stator winding 2 exposed from the axial end face d of the stator core 1 can be considered as the end winding of the stator winding 2. Along the radial direction of the motor, the annular section 321 of the exposed section 32 is arranged between the stator winding 2 and the center hole 11, and the outer diameter of the annular section 321 is smaller than the distance between the stator winding 2 and the axis of the motor 100, and the exposed section 32 will not affect the end of the stator winding 2 extending out of the stator core 1. Along the axial direction of the motor, the height of the exposed section 32 protruding from the axial end surface d of the stator core 1 is greater than the height of the axial end surface d of the stator winding 2 exposed from the stator core 1. When the exposed section 32 cooperates with the motor end cover 202, the motor end cover 202 will not contact the end of the stator winding 2. The distance between the outer circumferential surface of the extension section 322 and the axis of the motor 100 is greater than the slot bottom of the winding slot 12. The extension section 322 can cover a portion of the axial end surface d of the stator core 1 along the axial direction of the motor.

[0091] Please continue to refer to Fig.12 As shown, an annular protrusion 2021 of the motor end cover 202 extends into the inner ring of an exposed section 32 along the axial direction of the motor, and the exposed section 32 and the annular protrusion 2021 are arranged adjacent to each other along the radial direction of the motor. The inner circumference of the exposed section 32 is used to cooperate and fix with the outer circumference of the annular protrusion 2021 along the radial direction of the motor. An accommodating cavity S is formed between the motor end cover 202 and an axial end face d of the stator core 1, and 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 and extends into the accommodating cavity S. When the accommodating cavity S is filled with coolant, the coolant can immerse the end winding of the stator winding 2 in liquid cooling.

[0092] Taking into account the manufacturing process and production cost, the annular injection molded body 3 may also have other structural forms.

[0093] In one embodiment, Fig.13a The annular injection molding body 3 shown in the figure has a plurality of embedded sections 31 as in the above-mentioned embodiment. Fig. 9 The annular injection molding body 3 shown in the figure has multiple embedded sections 31, each embedded section 31 is used to embed a winding slot 12 along the radial direction of the motor and cover the inner wall of the winding slot 12. The exposed section 32 included in the annular injection molding body 3 is the exposed section 32 of the above embodiment. Figure 4The exposed section 32 shown is equivalent to an annular section. In the radial direction of the motor, the outer diameter of each embedded section 31 is larger than the outer diameter of the annular section 321. In the axial direction of the motor, the space enclosed by each embedded section 31 is connected to the space on one side of the outer peripheral surface of each exposed section 32.

[0094] Fig.13b The schematic cross-sectional view of the partial structure of the motor 100 including the annular injection molding body 3. When the annular injection molding body 3 and the stator core 1 are injection molded, each embedded segment 31 is embedded in a winding slot 12 along the radial direction of the motor and covers the inner wall of the winding slot 12 to be fixed, and the stator winding 2 accommodated in the winding slot 12 is specifically accommodated in the space enclosed by the embedded segment 31. The exposed segment 32 is connected and fixed to the motor end cover 202, and a receiving cavity S is formed between the motor end cover 202, the stator sleeve 201 and the axial end face d of the stator core 1, and the end of the stator winding 2 passes through the embedded segment 31 along the axial direction of the motor and enters the receiving cavity S.

[0095] In one embodiment, Fig.14a The annular injection molding body 3 shown in the figure has a plurality of embedded sections 31 as in the above-mentioned embodiment. Figure 4 The annular injection molding body 3 shown in the figure has a plurality of embedded sections 31, each of which is used to be embedded in the notch 121 of a winding slot 12 along the radial direction of the motor. The exposed section 32 included in the annular injection molding body 3 is the exposed section 32 of the above-mentioned embodiment. Fig. 9 The exposed section 32 shown in the figure includes an annular section 321 and an extension section 322. The extension section 322 includes a plurality of through holes g arranged at intervals along the circumferential direction of the motor, and each through hole g penetrates the annular section 321 along the axial direction of the motor. In the radial direction of the motor, the outer diameter of each embedded section 31 is equivalent to the outer diameter of the annular section 321, and the outer diameter of the extension section 322 is larger than the outer diameter of the embedded section 31 and the outer diameter of the annular section 321. In the axial direction of the motor, the through holes g are connected to the space on one side of the outer circumference of the annular section 321 and the space on one side of the outer circumference of the embedded section 31.

[0096] Fig.14b The schematic cross-sectional diagram of the partial structure of the motor 100 including the annular injection molding body 3. When the annular injection molding body 3 and the stator core 1 are injection molded, each embedded section 31 is embedded in the notch 121 of a winding slot 12 along the radial direction of the motor and fixed, and the extended section 322 of the exposed section 32 covers the axial end face d of the stator core 1 along the radial direction of the motor, and each through hole g is connected with a winding slot 12 along the axial direction of the motor. The exposed section 32 is connected and fixed to the motor end cover 202, and a receiving cavity S is formed between the motor end cover 202, the stator sleeve 201 and the axial end face d of the stator core 1, and the stator winding 2 contained in a winding slot 12 can pass through the through hole g of the extended section 322 and extend into the receiving cavity S.

[0097] In some embodiments, an exposed section 32 of the annular injection molding body 3 covers an axial end surface d of the stator core 1. In order to reduce the amount and weight of the annular injection molding body 3, as shown in FIG. Fig.15 As shown, the exposed section 32 of the annular injection molding body 3 covering the axial end face d of the stator core 1 may include one or more through holes p, each through hole p passing through the exposed section 32 covering the axial end face along the axial direction of the motor. Different from the through hole g of the annular injection molding body 3, when the annular injection molding body 3 and the stator core 1 are injection molded, each through hole p here can be arranged between two winding slots 12. Fig.15 In FIG. 1 , only one through hole p is illustrated.

[0098] It should be understood that there is no necessary relationship between the through hole p and the through hole g, and the exposed section 32 of the annular injection molded body 3 may only have the through hole g. Fig. 9 Alternatively, the exposed section 32 of the annular injection molding body 3 may also have both a through hole p and a through hole g, such as Fig.15 shown.

[0099] In some embodiments, the exposed section 32 of the annular injection molding body 3 covers the portion between the winding slots 12 of the axial end face d of the stator core 1. In this case, the exposed section 32 may only include a through hole p. Based on this annular injection molding body 3, in one embodiment, along the radial direction of the motor, each through hole p includes a notch, and the notch of each through hole p faces away from a center hole 11 along the radial direction of the motor, and the notch may be connected to the outer peripheral surface of the exposed section 32 along the radial direction of the motor. Along the circumference of the motor, the width of each notch is greater than the width of each winding slot 12, and the circumferentially adjacent notches may be connected to form an exposed section 32 with a smaller radial dimension. When the adjacent notches along the circumference of the motor are connected, the structure of the exposed section 32 of the annular injection molding body 3 is similar to Figure 4 It can be considered that this is Figure 4 One way in which the exposed section 32 is formed is shown.

[0100] In one embodiment, the stator core 1 provided in the embodiment of the present application can pass oil or water to cool the stator 10, and the stator core 1 is formed with one or more liquid cooling channels, and the one or more liquid cooling channels can be connected to the accommodating cavity S formed between the above-mentioned motor end cover 202 and the stator 10.

[0101] Fig.16 The structure of a stator core 1 provided in an embodiment of the present application. Fig.16As shown, with the overall structure of the stator core 1 as a reference, the stator core 1 includes a center hole 11 and a plurality of winding slots 12. Along the axial direction of the motor, the center hole 11 penetrates the stator core 1 along the axial direction of the motor, that is, the two ends of the center hole 11 are respectively connected to the two axial end faces d. Each winding slot 12 penetrates the stator core 1 along the axial direction of the motor, that is, the two ends of each winding slot 12 are respectively connected to the two axial end faces d. A plurality of winding slots 12 are arranged at intervals along the circumference of the motor, and a stator tooth portion is formed between any two adjacent winding slots 12, and the portion between the bottom of each winding slot 12 and the outer peripheral surface of the stator core 1 is the yoke of the stator. In one embodiment, along the circumference of the motor, the distance between any two winding slots 12 is approximately equal, and the structure of the stator core 1 is symmetrical along the circumferential center of the motor. In one embodiment, each winding slot 12 is connected to the center hole 11 along the radial direction of the motor.

[0102] Please continue to refer to Fig.16 The stator core 1 includes a plurality of stator punching sheets 101 arranged adjacent to each other in the axial direction of the motor, and the plurality of stator punching sheets 101 can form a liquid cooling channel in the stator core 1. The plurality of stator punching sheets 101 include at least one first stator punching sheet 101 and a plurality of second stator punching sheets 102, and the at least one first stator punching sheet 101 and the at least one second stator punching sheet 102 are arranged adjacent to each other in the axial direction of the motor. The one second stator punching sheet 102 or the plurality of stacked second stator punching sheets 102 can form one or more axial liquid cooling channels t1, and each 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. The at least one first stator punching sheet 101 can form a circumferential liquid cooling channel t2, which is connected to the outer peripheral surface of the stator core 1 and extends along the circumference of the motor. The one or more axial liquid cooling channels t1 are all connected to the circumferential liquid cooling channel t2. By passing the 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 surfaces d of the stator core 1. The multiple axial liquid cooling channels t1 and the circumferential liquid cooling channel t2 here form the liquid cooling channel of the stator core 1.

[0103] The circumferential liquid cooling channel t2 may be formed by one first stator punching sheet 101, or may be formed by a combination of a plurality of first stator punching sheets 101. When the stator core 1 includes a plurality of first stator punching sheets 101, the structures of the plurality of first stator punching sheets 101 may be the same or different, as long as the circumferential liquid cooling channel t2 connected to the axial liquid cooling channel t1 can be formed.

[0104] In some embodiments, along the axial direction of the motor, a plurality of second stator punching sheets 102 are stacked and arranged between two groups of first stator punching sheets 101, and each group of second stator punching sheets 102 includes one second stator punching sheet 102 or a plurality of stacked first stator punching sheets 101. Each group of second stator punching sheets 102 forms one or more axial liquid cooling channels t1, and an axial liquid cooling channel t1 formed by one group of second stator punching sheets 102 is connected to an axial liquid cooling channel t1 formed by another group of second stator punching sheets 102 through holes on a plurality of second stator punching sheets 102. When the coolant enters any axial liquid cooling channel 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 group of second stator punching sheets 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 group of second stator punching sheets 102 to another axial end face d of the stator core 1.

[0105] When the annular injection molding body 3 and Fig.16 When the stator core 1 is injection molded, the exposed section 32 of the annular injection molding body 3 has a hole connected to the axial liquid cooling channel t1 of the stator core 1, so as to guide the coolant to the accommodation cavity S at one axial end surface d of the stator core 1 to immerse the end of the stator winding 2 in liquid cooling. In some embodiments, the channel formed after the embedded section 31 of the annular injection molding body 3 is embedded in the winding slot 12 can be connected to the circumferential liquid cooling channel t2 of the stator core 1, so as to guide the coolant into the winding slot 12 to immerse the part of the stator winding 2 accommodated in the winding slot 12 in liquid cooling.

[0106] In some embodiments, Fig.17 The structure of the annular injection molded body 3 of the stator 10 provided in the embodiment of the present application is as follows. Fig.17 As shown, the annular injection molding body 3 is Fig. 9The annular injection molding body 3 shown in the figure has a similar structure. The annular injection molding body 3 includes a plurality of embedded sections 31 arranged at intervals along the circumference of the motor. Each embedded section 31 is used to embed a winding slot 12 of the stator core 1 along the axial direction of the motor and cover the inner wall of the winding slot 12. Each embedded section 31 is in the shape of a pipe. 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 is connected to an axial flow channel q1 along the radial direction of the motor. An exposed section 32 of the annular injection molding body 3 includes an annular section 321 and an extension section 322. The annular section 321 is used to cooperate with the motor end cover 202 or the stator sleeve 201 to enclose and form a accommodating cavity S. The outer diameter of the extension section 322 is larger than the outer diameter of any one of the embedded sections 31. The extension section 322 includes a plurality of through holes g, which are arranged at intervals along the circumferential direction of the motor, and each through hole g penetrates the extension section 322 along the axial direction of the motor to communicate with an axial flow channel q1. The extension section 322 also includes a plurality of liquid cooling holes n, and each liquid cooling hole n penetrates the extension section 322 along the axial direction of the motor to communicate with an axial cooling channel t1 of the stator core 1.

[0107] Fig.18a The structure of the stator core 1 and the annular injection molding body 3 of a motor 100 provided in an embodiment of the present application is as follows: Fig.18b for Fig.18a A detailed enlarged view of the V in the middle. Fig.18a and Fig.18b In the process of manufacturing the motor 100, the annular injection molding body 3 is integrally injection-molded and fixed to the stator core 1 through the in-mold injection molding process to obtain Fig.18a The structure shown.

[0108] Refer to Fig.18a and Fig.18b As shown, the annular injection molding body 3 includes a plurality of embedded segments 31 which are respectively embedded in the plurality of winding slots 12 of the stator core 1 along the axial direction of the motor, and one embedded segment 31 is 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 shields the winding slot 12. Fig.18aThe number of the winding slot 12 shown indicates the position of the winding slot 12. An exposed section 32 included in the annular injection molding body 3 exposes an axial end face d of the stator core 1 along the axial direction of the motor, and an extension section 322 of the exposed section 32 covers the axial end face d of the stator core 1. In the radial direction of the motor, the inner diameter of the exposed section 32 is greater than or equal to the inner diameter of a center hole 11 of the stator core 1, and the outer diameter of the extension section 322 is greater than the distance between the bottom of the winding slot 12 and the axis of the motor 100 and less than the outer diameter of the stator core 1. The multiple liquid cooling holes n are arranged at intervals along the circumference of the motor, and each liquid cooling hole n is connected to one or more axial liquid cooling channels t1 of the stator core 1 along the axial direction of the motor, and the circumferential liquid cooling channel t2 can be connected to a liquid cooling hole n through one or more axial liquid cooling channels t1. In one embodiment, each liquid cooling hole n is connected to an axial liquid cooling channel t1, and the aperture of the liquid cooling hole n is greater than or equal to the aperture of the port of the corresponding axial liquid cooling channel t1 located at the one axial end surface d. In one embodiment, the extension section 322 of the exposed section 32 further includes a plurality of through holes g, and each through hole g is connected to an axial flow channel q1 formed by the embedded section 31.

[0109] Combination Fig.18b , by cutting the stator core 1 and the annular injection molding body 3 along the radial direction of the motor at the position shown in P1, we can obtain Fig.19a The schematic diagram of the partial cross-section structure shown in FIG. 1 passes through a winding slot 12 of a stator core 1 and an embedded section 31 embedded in the winding slot 12. Figure 8a As shown, each embedded segment 31 is embedded in a winding slot 12, and the embedded segment 31 extends around the inner wall of the winding slot 12. The axial flow channel q1 enclosed by the embedded segment 31 is isolated from the center hole 11 by a part of the structure of the embedded segment 31. The axial flow channel q1 extends along the axial direction of the motor to the two axial end faces d of the stator core 1. Each embedded segment 31 also includes a radial flow channel q2, which can connect the circumferential liquid cooling channel t2 of the stator core 1 with one or more axial flow channels q2 along the radial direction of the motor. The axial flow channel q1 enclosed by the embedded segment 31 is arranged outside the stator winding 2 accommodated in the winding slot 12. When the coolant in the circumferential liquid cooling channel t2 enters the axial flow channel q1 enclosed by an embedded segment 31 along the radial flow channel q2, the coolant can immerse the stator winding 2 accommodated in the winding slot 12 in the axial flow channel q1.

[0110] In one embodiment, each axial flow channel q1 extends along the axial direction of the motor to an exposed section 32 and is connected to a through hole g of the extension section 322. The axial flow channel q1 can be connected to the space on the side of the surface of the extension section 322 away from the axial end face d through the through hole g, and the coolant can flow along the axial flow channel q1 to the side of the surface of the extension section 322 away from the axial end face d.

[0111] Combination Fig.18b , by cutting the stator core 1 and the annular injection molding body 3 along the radial direction of the motor at the position shown in P2, we can obtain Fig.19b The schematic diagram of the partial cross-section structure shown in FIG. 1 passes through an axial liquid cooling channel t1 of a stator core 1 and a liquid cooling hole n of an annular injection molding body 3. Fig.19b As shown, an 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 an axial liquid cooling channel t1 is connected to a liquid cooling hole n 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.

[0112] Further references Fig. 20 A partial cross-sectional structural diagram of a motor 100 is shown. In one embodiment, the stator sleeve 201 includes a liquid inlet j that penetrates the stator sleeve 201 in the radial direction of the motor, and the liquid inlet j is connected to the circumferential liquid cooling channel t2 of the stator core 1 in the radial direction of the motor. The coolant entering from the liquid inlet j can enter the axial liquid cooling channel t1 of the stator core 1 along the circumferential liquid cooling channel t2, and enter the axial flow channel q1 through the radial flow channel p2 of the annular injection molding body 3. The coolant in the axial liquid cooling channel t1 and the axial flow channel q1 can enter the accommodating cavity S to immerse the end winding of the stator winding 2 in liquid cooling, and the coolant in the axial flow channel q1 can immerse the stator winding 2 accommodated in the axial flow channel q1 in liquid cooling.

[0113] In one embodiment, the motor end cover 202 further includes one or more liquid outlets K, which are used to discharge the coolant in an accommodating cavity S. In the radial direction of the motor, the axial distance between each liquid outlet K and the motor end cover 202 is greater than the outer diameter of the annular protrusion 2021. The coolant in the accommodating cavity S can be sprayed out through the liquid outlet K on the motor end cover 202.

[0114] Depend on Fig. 20 It can be seen that in the motor 100, a relatively closed chamber can be enclosed between the stator 10 and the housing 20 to immerse the stator winding 2 in liquid cooling. Specifically, each embedded section 31 of the annular injection molding body 3 can be embedded in a winding slot 12 to enclose an axial flow channel q1, and the axial flow channel q1 can immerse the stator winding 2 accommodated in the winding slot 12 in liquid cooling. The exposed section 32 of the annular injection molding body 3 can be connected and fixed to the motor end cover 202 of the housing 20, so as to form a receiving chamber S between the stator sleeve 201, the motor end cover 202, the exposed section 32 and an axial end face d of the stator core 1, and the receiving chamber S can immerse the end of the stator winding 2 exposed from the stator core 1 in liquid cooling.

[0115] It should be understood that in the actual structure, the axial flow channel q1 and the axial liquid cooling channel t2 are offset along the circumference of the motor, so Fig. 20The axial liquid-cooling channel t2 and the liquid-cooling hole n connected to the axial liquid-cooling channel t2 are shown with dotted lines only for illustrating the flow direction of the coolant of the motor 100 .

[0116] In summary, the motor 100 provided in the embodiment of the present application can form a sealed chamber that can immerse the stator winding 2 in liquid cooling through the cooperation of the housing 20 of the motor 100 and the stator 10, so as to achieve good cooling of the stator winding 2, thereby improving the continuous power of the motor 100. Among them, the annular injection molding body 3 and the stator core 1 are integrally injection molded, and the exposed section 32 of the annular injection molding body 3 is directly connected and fixed to the housing 20, which can shorten the end height of the stator and is conducive to miniaturization of the motor. Compared with the spray ring end winding cooling solution in the prior art, the structure is simpler and the cooling effect is better, which can reduce the production cost and improve the continuous power of the motor.

[0117] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An immersion liquid-cooled motor, characterized in that: The housing of the motor includes a stator sleeve and a motor end cover, wherein the stator sleeve is used to fix the stator of the motor, and the motor end cover is used to enclose the stator sleeve to form a motor cavity, and the motor cavity is used to accommodate the stator and rotor of the motor; The stator comprises a stator core, a stator winding and an integrally injection-molded annular injection molding body, wherein the stator core comprises a central hole and a plurality of winding slots, wherein the central hole penetrates the stator core along the axial direction of the motor, and the plurality of winding slots are arranged at intervals along the circumferential direction of the motor stator, and each winding slot is connected to the central hole along the radial direction of the motor stator, wherein: The plurality of winding slots are used to fix the stator winding and the annular injection molding body, and one end of the stator winding is exposed at an axial end surface of the stator core along the axial direction of the motor; The annular injection molding body includes an embedded section and an exposed section, wherein the exposed section and the embedded section are arranged adjacent to each other along the axial direction of the motor, the embedded section is used to be embedded in the plurality of winding slots along the radial direction of the motor, the exposed section is exposed at the axial end face along the axial direction of the motor, the exposed section is used to enclose the motor end cover, the stator sleeve and the axial end face to form an accommodating cavity, and the accommodating cavity is used to accommodate coolant to immerse the one end of the stator winding.

2. The motor according to claim 1, characterized in that Along the circumference of the motor, the inner width of each winding slot is greater than the slot width of the slot of the winding slot for connecting to the central hole, and the embedded segment embedded in each winding slot fills the slot of each winding slot.

3. The motor according to claim 2, characterized in that Along the radial direction of the motor, the length of the embedded segment embedded in each winding slot is less than or equal to the length of the slot.

4. The motor according to claim 2, characterized in that In the radial direction of the motor, the one embedded segment embedded in each winding slot surrounds the stator winding accommodated in the winding slot along the inner wall of the winding slot.

5. The motor according to any one of claims 1 to 4, characterized in that: The exposed section is used to cover a portion of the axial end surface, and an outer diameter of the portion of the exposed section covering the axial end surface is greater than a diameter of the central hole.

6. The motor according to claim 5, characterized in that In the radial direction of the motor, an outer diameter of a portion of the exposed segment covering the axial end surface is smaller than a distance between the stator winding in each winding slot and an axis of the motor.

7. The motor according to claim 5, characterized in that The outer diameter of the portion where the exposed segment covers the axial end surface is greater than the distance between the bottom of each winding slot and the axis of the motor, and one end of the stator winding passes through the portion where the exposed segment covers the axial end surface along the axial direction of the motor and is exposed at an axial end surface of the stator core.

8. The motor according to claim 7, characterized in that The portion of the exposed section covering the axial end surface includes a plurality of through holes, the plurality of through holes are arranged at intervals along the circumferential direction of the motor, each of the through holes penetrates the exposed section along the axial direction of the motor and is connected to one of the winding slots, wherein: The size of each through hole along the radial direction of the motor is greater than or equal to the size of each winding slot, and the distance between two adjacent through holes along the circumferential direction of the motor is less than or equal to the distance between two corresponding adjacent winding slots.

9. The motor according to claim 7, characterized in that Along the radial direction of the motor, the portion of the exposed section covering the axial end surface includes a plurality of through holes, each of the through holes penetrates the portion of the exposed section covering the axial end surface along the axial direction of the motor, and each of the through holes is arranged between two of the winding slots.

10. The motor according to claim 9, characterized in that Along the radial direction of the motor, each through hole includes a notch, the notch of each through hole faces away from the one central hole along the radial direction of the motor, and the width of each notch along the circumferential direction of the motor is greater than the width of each winding slot.

11. The motor according to any one of claims 1 to 10, characterized in that: The stator core includes one or more liquid cooling channels, and the portion of the exposed section covering the axial end surface includes a plurality of liquid cooling holes, each of the liquid cooling holes being used to connect the accommodating cavity and at least one of the liquid cooling channels.

12. The motor according to any one of claims 1 to 11, characterized in that: The exposed section further comprises an annular section, the motor end cover comprises an annular protrusion and a bearing groove, the annular protrusion surrounds the bearing groove, wherein: The annular protrusion is used to extend into the central hole of the annular segment along the axial direction of the motor, and the gap between the outer circumferential surface of the annular boss and the inner circumferential surface of the annular segment is used to accommodate a sealing ring; The bearing groove is used to fix the outer ring of a bearing, and the inner ring of the bearing is used to drive and connect the motor shaft of the motor.

13. The motor according to claim 12, characterized in that Along the axial direction of the motor, the length of the annular segment exposed from the axial end surface is greater than the length of the annular boss protruding from the motor end cover.

14. A powertrain, characterized in that: The powertrain comprises a reducer or a transmission and a motor as claimed in any one of claims 1 to 13; The output shaft of the motor is coaxially connected to the input shaft of the reducer or the transmission.

15. A vehicle, characterized in that: The vehicle comprises wheels, a transmission mechanism and the powertrain as claimed in claim 14, wherein the powertrain drives the wheels via the transmission mechanism.

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