Driving motor, power assembly and electric vehicle

Abstract

The invention provides a driving motor, a power assembly and an electric vehicle. A stator winding of a stator of the drive motor is wound around a stator core. And the two special-shaped iron cores of the stator iron core are arranged adjacently along the axial direction of the driving motor. And each special-shaped iron core comprises a plurality of groups of runners which are distributed along the circumferential direction of the driving motor at intervals. Each group of flow channels comprises an outer-layer flow channel, an inner-layer short flow channel and an inner-layer long flow channel, the inner-layer short flow channel and the outer-layer flow channel in each group of flow channels are distributed on the same side of the inner-layer long flow channel in the circumferential direction of the driving motor, and the inner-layer short flow channel and the outer-layer flow channel in each group of flow channels are distributed at intervals in the radial direction of the driving motor. And the maximum width of the inner-layer long flow channel in each group of flow channels along the circumferential direction of the driving motor is greater than the interval between the inner-layer short flow channel and the inner-layer long flow channel. And the length of the inner-layer long flow channel in each group of flow channels along the radial direction of the driving motor is greater than the interval between the inner-layer short flow channel and the outer-layer flow channel. Through the special-shaped iron core of one type, the heat dissipation effect of the motor stator can be ensured, and the complexity of a cooling oil path of the motor stator can be reduced.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a drive motor, a powertrain, and an electric vehicle. Background Art

[0002] The drive motor in an electric vehicle includes a motor rotor and a motor stator. The motor stator includes a stator core and a stator winding. The stator winding is wound around the stator core. When the stator winding is energized, it can generate a magnetic field to drive the motor rotor to rotate and output power.

[0003] The heat generated by the motor stator is the primary heat source for the drive motor. The motor's heat dissipation performance affects its performance, which in turn affects the range of the electric vehicle. However, existing motor stator cooling oil circuits are relatively complex. Summary of the Invention

[0004] The present application provides a drive motor, powertrain, and electric vehicle. Using a special-shaped iron core, this design not only enables oil flow through the inner and outer double-layer flow channels of the stator core, but also enables oil flow between the inner and outer double-layer flow channels of the stator core. This ensures effective heat dissipation of the motor stator while reducing the complexity of the stator's cooling oil circuit, thereby improving the performance of the drive motor. Furthermore, this contributes to improving the performance of the powertrain and the range of the electric vehicle.

[0005] In a first aspect, a drive motor is provided, wherein the motor stator of the drive motor includes a stator core and a stator winding, wherein the stator winding is wound around the stator core. The stator core includes two special-shaped cores, which are arranged adjacent to each other along the axial direction of the drive motor. Each special-shaped core includes multiple groups of flow channels, and the multiple groups of flow channels are spaced apart along the circumference of the drive motor. Each group of flow channels includes a first outer layer flow channel, a first inner layer short flow channel, and a first inner layer long flow channel. The first inner layer short flow channel and the first outer layer flow channel in each group of flow channels are spaced apart along the circumference of the drive motor. The first inner layer short flow channel and the first outer layer flow channel in each group of flow channels are spaced apart along the radial direction of the drive motor. The maximum width of the first inner layer long flow channel in each group of flow channels along the circumference of the drive motor is greater than the spacing between the first inner layer short flow channel and the first inner layer long flow channel. The length of the first inner layer long flow channel in each group of flow channels along the radial direction of the drive motor is greater than the spacing between the first inner layer short flow channel and the first outer layer flow channel.

[0006] In the drive motor provided by the embodiment of the present application, since the maximum width of the first inner long runner in each group of runners along the circumference of the drive motor is greater than the spacing between the first inner short runner and the first inner long runner, after one of the two special-shaped iron cores is rotated by a certain angle relative to the other special-shaped iron core, one first inner long runner of one special-shaped iron core can connect to the two first inner long runners and one first inner short runner of the other special-shaped iron core. In addition, since the length of the first inner long runner along the radial direction of the drive motor is greater than the spacing between the first inner short runner and the first outer runner, after one of the two special-shaped iron cores is rotated by a certain angle relative to the other special-shaped iron core, the first inner long runner of one special-shaped iron core can also connect to each first outer runner of the other special-shaped iron core.

[0007] A first outer layer flow channel of another special-shaped iron core, a first inner layer long flow channel of one special-shaped iron core, and two first inner layer long flow channels of another special-shaped iron core form a cooling oil circuit of the stator iron core, and a first outer layer flow channel of another special-shaped iron core, a first inner layer long flow channel of one special-shaped iron core, and a first inner layer short flow channel of another special-shaped iron core form another cooling oil circuit of the stator iron core. Thus, through a single type of special-shaped iron core, the two special-shaped iron cores can form two parallel cooling oil circuits, ensuring the heat dissipation effect of the motor stator. In addition, through a single type of special-shaped iron core, the cooling oil in the outer layer flow channel of the other special-shaped iron core is respectively introduced into each inner layer flow channel of each special-shaped iron core through two cooling oil circuits, thereby achieving oil flow between the inner and outer double-layer flow channels of the stator iron core, reducing the complexity of the cooling oil circuit of the motor stator. Furthermore, this helps to improve the performance of the drive motor. Among them, the performance of the drive motor includes the efficiency, power density, torque density, life, etc. of the drive motor.

[0008] In one implementation, the two special-shaped cores are staggered along the circumference of the drive motor. The first outer runners in the two special-shaped cores are staggered along the circumference of the drive motor. The first inner short runners in the two special-shaped cores are staggered along the circumference of the drive motor. The first inner long runners in the two special-shaped cores are staggered along the circumference of the drive motor. The first inner short runners and the first inner long runners in the two special-shaped cores are aligned axially along the drive motor. Consequently, after the two special-shaped cores are folded together circumferentially, two parallel cooling oil paths are formed for the stator core, simplifying the assembly process of the two special-shaped cores.

[0009] In one implementation, each first outer runner of one shaped iron core partially connects to a first inner long runner of the other shaped iron core. Each first inner long runner of the other shaped iron core partially connects to a first inner short runner of one shaped iron core and to two first inner long runners of two adjacent sets of runners. Thus, after the two shaped iron cores are folded circumferentially around the drive motor, the two parallel cooling oil circuits of the stator core can be interconnected, simplifying the assembly process of the two shaped iron cores.

[0010] In one implementation, the width of the stator winding along the circumferential direction of the drive motor is respectively smaller than the minimum width of each first inner layer long flow channel and the width of each first inner layer short flow channel.

[0011] When the stator winding passes through the first inner long channel and the first inner short channel and is wound around the stator core, gaps exist between the stator winding and the first inner long channel and the first inner short channel along the circumference of the drive motor. These gaps can serve as dedicated cooling oil paths. Thus, the first inner long channel and the first inner short channel not only serve as winding slots to accommodate the stator winding, but also form dedicated cooling oil paths with the stator winding. Furthermore, the cooling oil not only cools the stator core but also immerses the stator winding, helping to improve the heat dissipation of the motor stator.

[0012] In one implementation, the plurality of special-shaped punchings of each special-shaped iron core are arranged sequentially along the axial direction of the drive motor. The outer circumferential surface of each special-shaped punching includes a plurality of grooves, which are spaced apart along the circumference of the drive motor, with each groove being recessed away from the outer circumferential surface of each special-shaped punching. The plurality of grooves of the plurality of special-shaped punchings are connected along the axial direction of the drive motor to form a first outer layer of flow channels in the plurality of flow channels. The inner circumferential surface of each special-shaped punching includes a plurality of short winding slots and a plurality of long winding slots. Each short winding slot is arranged adjacent to a long winding slot along the circumference of the drive motor, and each short winding slot and a groove are spaced apart along the radial direction of the drive motor. The slot depth of each long winding slot is greater than the sum of the slot depth of each short winding slot and the spacing between the short winding slot and the groove. The maximum slot width of each long winding slot along the circumference of the drive motor is greater than or equal to the spacing between the long winding slot and the adjacent short winding slot. Among them, multiple short winding slots of multiple special-shaped punching sheets are respectively connected along the axial direction of the driving motor to form the first inner layer long flow channel among multiple groups of flow channels, and multiple long winding slots of multiple special-shaped punching sheets are respectively connected along the axial direction of the driving motor to form the first inner layer short flow channel among multiple groups of flow channels.

[0013] Each special-shaped punching sheet is machined on its outer circumference to form the outer runner structure of each special-shaped iron core, and two winding slots are machined on its inner circumference to form the two inner runner structures of each special-shaped iron core. Thus, by simply machining a single groove on the outer circumference of each special-shaped punching sheet and reusing the winding slots of each special-shaped punching sheet, the layout of the inner and outer runners of each special-shaped iron core can be achieved, which helps reduce the number and area of openings in each special-shaped punching sheet and increases the contact area between two adjacent special-shaped punching sheets. Furthermore, by utilizing gluing or welding processes to achieve a firm connection between two adjacent special-shaped punching sheets, the reliability of the stator core can be improved.

[0014] In addition, the winding slots of each special-shaped punching sheet are reused as the structure of two inner layer flow channels of each special-shaped iron core, so that the stator winding can be immersed in cooling, which helps to improve the heat dissipation effect of the motor stator.

[0015] In one implementation, the outer circumference of each shaped iron core includes multiple oil collecting grooves, which are spaced apart along the circumference of the drive motor, with each groove recessed away from the outer circumference of the shaped iron core. Each oil collecting groove of each shaped iron core is connected to the first outer layer of the multiple flow channels. This allows the oil collecting grooves of each shaped iron core to collect a large amount of cooling oil, ensuring sufficient cooling oil is supplied to the outer axial flow channels of the shaped iron core.

[0016] In one implementation, the stator core also includes a conventional core, and two special-shaped cores are arranged on the same side of the conventional core along the axial direction of the drive motor. Among them, a conventional core includes multiple second outer layer runners and multiple second inner layer runners, multiple second outer layer runners are distributed at intervals along the circumference of the drive motor, and multiple second inner layer runners are distributed at intervals along the circumference of the drive motor. Each first outer layer runner is used to connect one or more second outer layer runners, each first inner layer short runner is used to connect one second inner layer runner of two adjacently arranged second inner layer runners, and each first inner layer long runner is used to connect the other second inner layer runner of the two second inner layer runners. Therefore, the coolant in the inner and outer layers of the special-shaped core can also flow into the inner and outer layers of the adjacent conventional core respectively, so as to perform inner and outer double-layer cooling of the conventional core, thereby improving the heat dissipation effect of the stator core.

[0017] In one implementation, each special-shaped iron core includes a plurality of special-shaped punchings, which are arranged in sequence along the axial direction of the drive motor. A conventional iron core includes a plurality of conventional punchings, which are arranged in sequence along the axial direction of the drive motor. The number of special-shaped punchings in each special-shaped iron core is less than the number of conventional punchings in a conventional iron core.

[0018] The outer runners and inner long and short runners in each special-shaped core are primarily designed to direct the cooling oil in the outer runners into each inner runner of each special-shaped core via two cooling oil circuits. That is, the runners in the two special-shaped cores function as drainage and shunt oil circuits. The inner and outer runners on a conventional core are connected to the inner and outer runners of an adjacent special-shaped core, respectively. That is, the runners in the conventional core function as cooling oil circuits. Therefore, compared to conventional cores, by making the special-shaped core thinner, i.e., by having fewer special-shaped punchings in the special-shaped core, the drainage and shunt oil circuits in the stator core can be shortened, and the cooling oil circuits in the stator core can be lengthened. Furthermore, by rationally arranging the lengths of the various oil circuits in the stator core, the heat dissipation effect of the stator core can be improved.

[0019] In one implementation, the width of each second inner flow channel along the radial direction of the drive motor and along the circumferential direction of the drive motor is a variable value, and the width of the stator winding along the circumferential direction of the drive motor is equal to the minimum width of each second inner flow channel.

[0020] When the stator winding passes through the second inner channel and winds around the stator core, a gap forms between the stator winding and the second inner channel along the circumference of the drive motor, which serves as a dedicated cooling oil path. Thus, the second inner channel not only serves as a winding slot to accommodate the stator winding but also forms a dedicated cooling oil path between the stator winding and the stator winding. Furthermore, the cooling oil not only cools the stator core but also immerses the stator winding, helping to improve the heat dissipation of the motor stator.

[0021] In one implementation, each conventional punching sheet of a conventional iron core includes a plurality of oil holes, and the plurality of oil holes are spaced apart along the circumference of the drive motor. The plurality of oil holes of the plurality of conventional punching sheets are connected along the axial direction of the drive motor to form a plurality of second outer flow channels.

[0022] The oil hole of each conventional punching sheet serves as a structure for forming the outer layer flow channel of the conventional iron core. Thus, the cooling oil in the outer layer flow channel of the conventional iron core can also be sprayed onto the stator winding wound on the stator iron core to cool the stator iron core, thereby improving the heat dissipation effect of the stator iron core.

[0023] In one implementation, the outer peripheral surface of each conventional punching sheet of a conventional iron core includes multiple grooves, and the multiple grooves are distributed at intervals along the circumference of the drive motor. The concave direction of each groove is away from the outer peripheral surface of each conventional punching sheet, and the multiple grooves of the multiple conventional punching sheets are respectively connected along the axial direction of the drive motor to form multiple second outer layer flow channels.

[0024] A groove is processed on the outer peripheral surface of each conventional punching sheet as a structure for forming the outer layer flow channel of the conventional iron core. Therefore, it is only necessary to process a groove separately on the outer peripheral surface of each conventional punching sheet to realize the layout of the outer layer flow channel of the conventional iron core, thereby simplifying the processing technology of each conventional punching sheet.

[0025] In one implementation, the inner circumferential surface of each conventional punching sheet of a conventional iron core includes multiple winding slots, which are spaced apart along the circumference of the drive motor. A slot wall of each winding slot includes a groove, and the groove in each winding slot is recessed away from the slot wall. The multiple winding slots of the multiple conventional punching sheets and the grooves in the multiple winding slots are connected along the axial direction of the drive motor to form multiple second inner flow channels.

[0026] A groove is separately machined on the wall of the winding slot of each conventional punching sheet to form a dedicated cooling oil path for the conventional iron core, thereby enabling immersion cooling of the stator winding and helping to improve the heat dissipation effect of the motor stator.

[0027] Furthermore, by simply machining a groove in the wall of the winding slot of each conventional punching sheet and reusing the winding slots of each conventional punching sheet, the layout of the inner flow channel of the conventional iron core can be realized, which helps to reduce the number and area of openings in each conventional punching sheet and increase the contact area between two adjacent conventional punching sheets. Furthermore, it is possible to achieve a firm connection between two adjacent conventional punching sheets through gluing or welding processes, which helps to improve the reliability of the stator iron core.

[0028] In one implementation, the stator core further includes another conventional core, arranged adjacent to the first conventional core along the axial direction of the drive motor. The outer circumference of the second conventional core includes multiple oil reservoirs, which are spaced apart along the circumference of the drive motor. Each reservoir is recessed away from the outer circumference of the second conventional core, and each reservoir is connected to multiple second outer-layer flow channels. Thus, the oil reservoirs of the second conventional core can store cooling oil, avoiding waste of cooling oil.

[0029] In a second aspect, a power assembly is provided, which includes a reducer and a drive motor as described in any one of the first aspect and any possible implementation of the first aspect, wherein the motor shaft of the drive motor is used for transmission connection to the input shaft of the reducer.

[0030] The performance of the drive motor provided in the embodiment of the present application is improved, thereby helping to improve the performance of the powertrain provided in the second aspect.

[0031] In a third aspect, an electric vehicle is provided, comprising wheels, a transmission mechanism, and the powertrain as described in the second aspect, wherein the powertrain is configured to drive the wheels through the transmission mechanism.

[0032] The performance of the powertrain provided by the embodiments of the present application is improved, thereby helping to increase the cruising range of electric vehicles and improving the driving experience of electric vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application.

[0034] Figure 2 A schematic diagram of a drive motor provided in an embodiment of the present application.

[0035] Figure 3 and Figure 4 Each of them is a schematic diagram of the stator core provided in an embodiment of the present application.

[0036] Figure 5 A schematic diagram of a special-shaped iron core or special-shaped punching sheet provided in an embodiment of the present application.

[0037] Figure 6 Another schematic diagram of a drive motor provided in an embodiment of the present application.

[0038] Figure 7 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0039] Figure 8 for Figure 7 An enlarged schematic diagram of part A of the stator core is shown.

[0040] Figure 9 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0041] Figure 10 A schematic diagram of a conventional punching sheet provided in an embodiment of the present application.

[0042] Figure 11 for Figure 10 An enlarged schematic diagram of portion B of a conventional punch is shown.

[0043] Figure 12 for Figure 9 A schematic diagram of the fit between a conventional core and a special-shaped core in a stator core is shown.

[0044] Figure 13 and Figure 14 Each of them is another schematic diagram of the stator core provided in an embodiment of the present application.

[0045] Figure 15 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0046] Figure 16 Another schematic diagram of a conventional punching sheet provided in an embodiment of the present application.

[0047] Figure 17 for Figure 15 A schematic diagram of the cooperation between two conventional iron cores in the stator core shown.

[0048] Figure 18 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0049] Figure 19 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0050] Figure 20 A schematic diagram of a conventional punching sheet provided in an embodiment of the present application.

[0051] Figure 21 for Figure 20 An enlarged schematic diagram of portion C of a conventional punch is shown.

[0052] Figure 22 for Figure 19 A schematic diagram of the fit between a conventional core and a special-shaped core in a stator core is shown.

[0053] Figure 23 and Figure 24 Each of them is another schematic diagram of the stator core provided in an embodiment of the present application.

[0054] Figure 25 Another schematic diagram of the stator core provided in an embodiment of the present application.

[0055] Figure 26 for Figure 25 Another schematic diagram of the stator core is shown.

[0056] Figure 27 for Figure 26 An enlarged schematic diagram of portion D of the stator core is shown in FIG.

[0057] Figure 28 and Figure 29 Each of them is another schematic diagram of the stator core provided in an embodiment of the present application.

[0058] Figure 30 and Figure 31 Each of them is another schematic diagram of the stator core provided in an embodiment of the present application.

[0059] Figure 32 and Figure 33 Each of them is another schematic diagram of the stator core provided in an embodiment of the present application. DETAILED DESCRIPTION

[0060] The technical solution in this application will be described below with reference to the accompanying drawings.

[0061] The terms "equal" and "equal to" used in this application are not strictly equal, but rather fall within an acceptable error range. The terms "parallel" and "perpendicular" are not strictly parallel, but rather fall within an acceptable error range. The terms "perpendicular" and "perpendicular" are not strictly perpendicular, but rather fall within an acceptable error range.

[0062] In the embodiments of this application, the same reference numerals represent the same component or part. In the embodiments of this application, for multiple identical parts, only one of the parts may be labeled with a reference numeral in the drawings as an example. The same reference numerals apply to other identical parts or components. In addition, the sizes and dimensions of the parts shown in the drawings are for illustrative purposes only.

[0063] Figure 1 A schematic diagram of an electric vehicle provided in an embodiment of the present application. The electric vehicles provided in an embodiment of the present application include pure electric vehicles, hybrid electric vehicles, extended-range electric vehicles, plug-in hybrid electric vehicles or new energy vehicles, etc. Among them, pure electric vehicles are also called pure electric vehicle / battery electric vehicle, or simply pure EV / battery EV. Hybrid electric vehicles are also called hybrid electric vehicles, or simply HEV. Extended-range electric vehicles are also called range extended electric vehicles, or simply REEV. Plug-in hybrid electric vehicles are also called plug-in hybrid electric vehicles, or simply PHEV. New energy vehicles are also called newenergy vehicles, or simply NEV.

[0064] like Figure 1 As shown, the electric vehicle 1 includes a powertrain 10 and a power battery 20. The powertrain 10 is used to receive power from the power battery 20 and to convert electrical energy into mechanical energy to power the wheels of the electric vehicle 1.

[0065] In one embodiment, the electric vehicle 1 includes two powertrains 10, one of which is used to drive the two front wheels of the electric vehicle 1, and the other of which is used to drive the two rear wheels of the electric vehicle 1. In one embodiment, the electric vehicle 1 includes four powertrains 10, each of which is used to drive the four wheels of the electric vehicle 1.

[0066] like Figure 1As shown, the electric vehicle 1 also includes a power module 30. The power module 30 is configured to receive power from an external power source 40 to charge the power battery 20. In one embodiment, the external power source 40 is an AC power grid, an AC charging station, or a DC charging station. The power module 30 includes at least one of a DC charger and an AC charger.

[0067] The present application also provides a powertrain. Figure 1 As shown, the powertrain 10 provided in the embodiment of the present application includes a drive motor 100 , which is used to drive the wheels of the electric vehicle 1 .

[0068] In one embodiment, Figure 1 As shown, the powertrain 10 provided in the embodiment of the present application further includes a reducer 1001 , and the drive motor 100 is used to drive the wheels of the electric vehicle 1 through the reducer 1001 .

[0069] In one embodiment, Figure 1 As shown, the powertrain 10 provided in the embodiment of the present application also includes a motor controller 1002, which is used to receive the direct current output by the power battery 20, convert the direct current output by the power battery 20 into alternating current and control the drive motor 100 to drive the wheels of the electric vehicle 1 through the reducer 1001.

[0070] Figure 2 A schematic diagram of a drive motor provided in an embodiment of the present application. Figure 2 As shown, the drive motor 100 includes a motor stator 110, a motor rotor 120, and a motor shaft 130. The motor stator 110 is used to accommodate the motor rotor 120, and the motor rotor 120 is used for transmission connection to the motor shaft 130. When the motor controller 1002 controls the operation of the drive motor 100, the motor rotor 120 in the drive motor 100 rotates relative to the motor stator 110, and the motor rotor 120 drives the motor shaft 130 to rotate.

[0071] In the embodiment of this application, Figure 2 As shown, the motor stator 110 of the drive motor 100 includes a stator core 111 and a stator winding 112. The stator core 111 is used to wind the stator winding 112. The stator winding 112 is used to receive the alternating current provided by the motor controller 1002 to generate a magnetic field to drive the motor rotor 120, so that the motor rotor 120 rotates relative to the motor stator 110, and the motor rotor 120 drives the motor shaft 130 to rotate.

[0072] In one embodiment, Figure 2 As shown, the stator winding 112 is exposed from the stator core 111 along the axial direction of the drive motor 100 .

[0073] In the embodiment of the present application, the axial direction of the drive motor 100 can be understood as the axial direction of the stator core 111, the axial direction of the special-shaped iron core 200, the axial direction of the special-shaped punching sheet 210, the axial direction of the conventional iron core 300, the axial direction of the conventional punching sheet 310, the axial direction of the conventional iron core 400, the axial direction of the conventional punching sheet 410, the axial direction of the conventional iron core 500, the axial direction of the conventional punching sheet 510, the axial direction of the motor shaft 130, the axial direction of the motor stator 110, and the axial direction of the motor rotor 120.

[0074] Figure 3 and Figure 4 Each of them is a schematic diagram of the stator core provided in the embodiment of the present application. Figure 3 and Figure 4 As shown, the stator core 111 includes two special-shaped cores 200, the two special-shaped cores 200 are arranged adjacent to each other along the axial direction of the drive motor 100, and the two special-shaped cores 200 are arranged staggered along the circumferential direction of the drive motor 100. In other words, Figure 4 As shown, relative to one of the two special-shaped cores 200 a , the other special-shaped core 200 b rotates along the circumferential direction of the drive motor 100 by an angle θ and is stacked with the other special-shaped core 200 a .

[0075] In one embodiment, the rotation angle θ is the angle between the central axis of the first inner short flow channel 222 and the central axis of the first inner long flow channel 223 along the circumference of the drive motor 100 .

[0076] In the embodiment of the present application, the circumferential direction of the drive motor 100 can be understood as the circumferential direction of the stator core 111, the circumferential direction of the special-shaped iron core 200, the circumferential direction of the special-shaped punching sheet 210, the circumferential direction of the conventional iron core 300, the circumferential direction of the conventional punching sheet 310, the circumferential direction of the conventional iron core 400, the circumferential direction of the conventional punching sheet 410, the circumferential direction of the conventional iron core 500, the circumferential direction of the conventional punching sheet 510, the circumferential direction of the motor shaft 130, the circumferential direction of the motor stator 110, and the circumferential direction of the motor rotor 120.

[0077] like Figure 4 As shown, each special-shaped iron core 200 includes a center hole O1. The center holes O1 of the two special-shaped iron cores 200 are connected along the axial direction of the drive motor 100 to form the center hole O of the stator iron core 111. The center hole O of the stator iron core 111 is used to accommodate the motor rotor 120. In the embodiment of the present application, the hole wall of the center hole O1 of each special-shaped iron core 200 is the inner circumferential surface S1 of each special-shaped iron core 200.

[0078] Figure 5A schematic diagram of a special-shaped iron core or special-shaped punching provided in an embodiment of the present application. Each special-shaped iron core 200 includes one or more special-shaped punchings 210, and the multiple special-shaped punchings 210 are arranged in sequence along the axial direction of the drive motor 100. Each special-shaped punching 210 includes a center hole O11, and the center hole O11 of each special-shaped punching 210 is the inner circumference S11 of each special-shaped punching 210. When the number of special-shaped punchings 210 in each special-shaped iron core 200 is one, such as Figure 5 As shown, the center hole O11 of the special-shaped punching piece 210 is the center hole O1 of each special-shaped iron core 200, and the hole wall of the center hole O11 of the special-shaped punching piece 210 is the inner circumferential surface S1 of the special-shaped iron core 200. When there are multiple special-shaped punching pieces 210 in each special-shaped iron core 200, the center holes O11 of the multiple special-shaped punching pieces 210 in each special-shaped iron core 200 are connected along the axial direction of the drive motor 100 to form the center hole O1 of each special-shaped iron core 200, and the hole wall of the center hole O11 of the multiple special-shaped punching pieces 210 in each special-shaped iron core 200 forms the inner circumferential surface S1 of each special-shaped iron core 200.

[0079] like Figure 5 As shown, each shaped iron core 200 includes multiple groups of flow channels 220, which are spaced apart along the circumference of the drive motor 100. Each group of flow channels 220 includes outer and inner flow channels. The outer flow channels of each of the two shaped iron cores 200 are used to direct the received cooling oil into the inner flow channels of the adjacent shaped iron core 200. In other words, each group of flow channels 220 in each shaped iron core 200 functions as an oil diversion channel and an oil shunt channel.

[0080] When the number of special-shaped punching sheets 210 in each special-shaped iron core 200 is one, the function of each set of flow channels 220 in each special-shaped iron core 200 can be completed, thereby simplifying the assembly process of each special-shaped iron core 200. When the number of special-shaped punching sheets 210 in each special-shaped iron core 200 is multiple, not only can the function of each set of flow channels 220 in each special-shaped iron core 200 be completed, but each special-shaped iron core 200 can also be sufficiently heat-dissipated, thereby improving the heat dissipation effect of the stator core 111.

[0081] like Figure 5 As shown, each group of flow channels 220 includes a first outer layer flow channel 221 , and the first outer layer flow channel 221 is used to receive cooling oil.

[0082] like Figure 5 As shown, each special-shaped punching sheet 210 includes an outer peripheral surface S21, and the outer peripheral surface S21 and the inner peripheral surface S11 of each special-shaped punching sheet 210 are arranged opposite to each other along the radial direction of the drive motor 100. If the number of special-shaped punching sheets 210 in each special-shaped iron core 200 is one, as shown in FIG. Figure 5As shown, the outer circumferential surface S21 of the special-shaped punching piece 210 is the outer circumferential surface S2 of the special-shaped iron core 200. If each special-shaped iron core 200 has multiple special-shaped punching pieces 210, the outer circumferential surfaces S21 of the multiple special-shaped punching pieces 210 of each special-shaped iron core 200 form the outer circumferential surface S2 of each special-shaped iron core 200.

[0083] In the embodiment of the present application, the radial direction of the drive motor 100 can be understood as the radial direction of the stator core 111, the radial direction of the special-shaped iron core 200, the radial direction of the special-shaped punching 210, the radial direction of the conventional iron core 300, the radial direction of the conventional punching 310, the radial direction of the conventional iron core 400, the radial direction of the conventional punching 410, the radial direction of the conventional iron core 500, the radial direction of the conventional punching 510, the radial direction of the motor shaft 130, the radial direction of the motor stator 110, and the radial direction of the motor rotor 120.

[0084] In one embodiment, Figure 5 As shown, the outer circumferential surface S21 of each special-shaped punching sheet 210 includes a plurality of grooves G11, and the plurality of grooves G11 are spaced apart along the circumference of the drive motor 100, and the concave direction of each groove G11 is away from the outer circumferential surface S21 of each special-shaped punching sheet 210. If the number of special-shaped punching sheets 210 of each special-shaped iron core 200 is one, as shown in FIG. Figure 5 As shown, the multiple grooves G11 of the shaped punching sheet 210 form the first outer runner 221 of the multiple groups of runners 220 of each shaped iron core 200. If there are multiple shaped punching sheets 210 in each shaped iron core 200, the multiple grooves G11 of the multiple shaped punching sheets 210 of each shaped iron core 200 are connected along the axial direction of the drive motor 100 to form the first outer runner 221 of the multiple groups of runners 220 of each shaped iron core 200. Therefore, the outer peripheral surface S21 of each shaped punching sheet 210 is processed with a groove G11 as the structure forming the outer runner of each shaped iron core 200, which simplifies the processing technology of the outer runner of each shaped iron core 200.

[0085] Figure 6 Another schematic diagram of a drive motor provided in an embodiment of the present application. In one embodiment, as Figure 6 As shown, the drive motor 100 further includes a housing 140, which is used to secure the stator core 111. The inner wall of the housing 140 includes a plurality of oil outlets 141, which are spaced apart along the circumference of the drive motor 100. Each oil outlet 141 faces the first outer flow channel 221 of each shaped core 200. The first outer flow channel 221 of each set of flow channels 220 is used to receive cooling oil output from one of the oil outlets 141 of the housing 140.

[0086] In one embodiment, the multiple oil outlets 141 of the housing 140 are connected along the circumference of the drive motor 100 to form an annular oil outlet. Thus, the multiple oil outlets 141 of the housing 140 can evenly output cooling oil along the circumference of the drive motor 100. Furthermore, during assembly of the housing 140 and the stator core 111, there is no need to align each oil outlet 141 with the first outer layer of flow channels 221 of the set of flow channels 220, thereby simplifying the assembly process of the housing 140 and the stator core 111.

[0087] like Figure 5 As shown, each group of flow channels 220 further includes a first inner short flow channel 222 and a first inner long flow channel 223. The first inner short flow channel 222 and the first outer flow channel 221 in each group of flow channels 220 are distributed on the same side of the first inner long flow channel 223 along the circumference of the drive motor 100. In addition, the first inner short flow channel 222 and the first outer flow channel 221 in each group of flow channels 220 are distributed at intervals along the radial direction of the drive motor 100. Figure 5 As shown, along the radial direction of the drive motor 100 , the first inner short flow channels 222 in each group of flow channels 220 are distributed between the first outer flow channels 221 and the central hole O1 of each special-shaped iron core 200 .

[0088] Figure 7 Another schematic diagram of the stator core provided in an embodiment of the present application. Figure 8 for Figure 7 The enlarged schematic diagram of part A of the stator core is shown in FIG. Figure 5 As shown, the maximum width W of the first inner long flow channel 223 in each group of flow channels 220 along the circumference of the drive motor 100 is max is greater than the interval J1 between the first inner short channel 222 and the first inner long channel 223. Figure 7 and Figure 8 As shown, after one of the two special-shaped iron cores 200a is rotated relative to the other special-shaped iron core 200b along the circumference of the drive motor 100 by an angle θ, a first inner layer long flow channel 223a of one special-shaped iron core 200a can connect to two first inner layer long flow channels 223b and a first inner layer short flow channel 222b of the other special-shaped iron core 200b.

[0089] In one embodiment, the width of each first inner layer long flow channel 223 along the circumference of the drive motor 100 increases along the radial direction of the drive motor 100. For example, Figure 5As shown, each first inner long runner 223 includes a narrow runner 2231 and a wide runner 2232. The narrow runner 2231 and the wide runner 2232 of each first inner long runner 223 are connected in the radial direction of the drive motor 100. The narrow runners 2231 along the radial direction of the drive motor 100 are distributed between the wide runner 2232 and the center hole O1 of each special-shaped iron core 200. The width of the wide runner 2232 of the first inner long runner 223 along the circumference of the drive motor 100 is greater than the width of the narrow runner 2231 of the first inner long runner 223. The maximum width W of the first inner long runner 223 along the circumference of the drive motor 100 is max is the width of the wide channel 2232 of the first inner long channel 223. In addition, the width of the narrow channel 2231 of the first inner long channel 223 along the circumference of the drive motor 100 is approximately equal to the minimum width W of the first inner long channel 223. min .

[0090] In one embodiment, the width of each first inner long channel 223 along the circumference of the drive motor 100 is constant along the radial direction of the drive motor 100. The maximum width W of the first inner long channel 223 along the circumference of the drive motor 100 is max is the width of the first inner long channel 223 along the circumference of the drive motor 100. In addition, the minimum width W of each first inner long channel 223 is min It is also the width of the first inner long channel 223 along the circumferential direction of the drive motor 100 .

[0091] like Figure 5 As shown, the length L of the first inner long channel 223 in each group of channels 220 along the radial direction of the drive motor 100 is greater than the interval J2 between the first inner short channel 222 and the first outer channel 221. Figure 7 and Figure 8 As shown, after one of the two special-shaped iron cores 200a rotates relative to the other special-shaped iron core 200b along the circumference of the drive motor 100 by an angle θ, the first inner layer long flow channel 223a of one special-shaped iron core 200a can also be connected to each first outer layer flow channel 221b of the other special-shaped iron core 200b.

[0092] Continue to refer Figure 7 and Figure 8 After the two special-shaped iron cores 200 are staggered along the circumference of the drive motor 100, the first outer layer runners 221 in the two special-shaped iron cores 200 are staggered along the circumference of the drive motor 100, the first inner layer short runners 222 in the two special-shaped iron cores 200 are staggered along the circumference of the drive motor 100, and the first inner layer long runners 223 in the two special-shaped iron cores 200 are staggered along the circumference of the drive motor 100. The first inner layer short runners 222 and the first inner layer long runners 223 in the two special-shaped iron cores 200 are aligned along the axial direction of the drive motor 100.

[0093] Continue to refer Figure 7 and Figure 8 Each first outer layer flow channel 221a of one special-shaped iron core 200a is used to partially connect to a first inner layer long flow channel 223b of another special-shaped iron core 200b. Each first inner layer long flow channel 223b of another special-shaped iron core 200b is used to partially connect to a first inner layer short flow channel 222a of one special-shaped iron core 200a and to partially connect to two first inner layer long flow channels 223a of two adjacent groups of flow channels 220. Thus, as Figure 7 and Figure 8 As shown, a first outer layer flow channel 221b of the other special-shaped core 200b, a first inner layer long flow channel 223a of one special-shaped core 200a, and two first inner layer long flow channels 223a of the other special-shaped core 200b are interconnected to form a cooling oil circuit C1 of the stator core. A first outer layer flow channel 221b of the other special-shaped core 200b, a first inner layer long flow channel 223a of one special-shaped core 200a, and a first inner layer short flow channel 222b of the other special-shaped core 200b are interconnected to form another cooling oil circuit C2 of the stator core. Furthermore, by using a single type of special-shaped core 200, the two special-shaped cores 200 can form two parallel cooling oil circuits C1 and C2, ensuring effective heat dissipation of the motor stator 110.

[0094] In addition, by using one type of special-shaped iron core 200, the cooling oil in the outer layer flow channel 221b of the other special-shaped iron core 200b is respectively introduced into each inner layer flow channel of each special-shaped iron core 200 through two cooling oil circuits C1 and C2, namely the first inner layer short flow channel 222 and the first inner layer long flow channel 223, so that the oil flow between the inner and outer double-layer flow channels of the stator core 111 can be achieved, which not only reduces the complexity of the cooling oil circuit of the motor stator 110, but also simplifies the processing process of the stator core 111. Furthermore, it helps to improve the performance of the drive motor 100. Among them, the performance of the drive motor 100 includes the efficiency, power density, torque density, life, etc. of the drive motor 100.

[0095] In one embodiment, Figure 5As shown, the inner circumference S11 of each special-shaped punching sheet 210 includes a plurality of short winding slots G12 and a plurality of long winding slots G13, and each short winding slot G12 and each long winding slot G13 are respectively used to accommodate the stator winding 112. Each short winding slot G12 is arranged adjacent to a long winding slot G13 along the circumference of the drive motor 100, and each short winding slot G12 is arranged spaced apart from a groove G11 along the radial direction of the drive motor 100. The slot depth L of each long winding slot G13 is greater than the sum of the slot depth M of each short winding slot G12 and the interval J2 between the short winding slot G12 and the groove G11, that is, L>(M+J2). The maximum slot width W of each long winding slot G13 along the circumference of the drive motor 100 is max Greater than or equal to the interval J1 between the long winding slot G13 and the adjacent short winding slot G12.

[0096] When the number of the special-shaped punching sheet 210 of each special-shaped iron core 200 is one, as shown in FIG. Figure 5 As shown, the multiple short winding slots G12 of the shaped punching sheet 210 form the first inner long runner 223 in the multiple groups of runners 220 of each shaped iron core 200, and the multiple short winding slots G13 of the shaped punching sheet 210 form the first inner short runner 222 in the multiple groups of runners 220 of each shaped iron core 200.

[0097] When there are multiple shaped punching sheets 210 in each shaped iron core 200, the multiple short winding slots G12 of the multiple shaped punching sheets 210 of each shaped iron core 200 are respectively connected along the axial direction of the drive motor 100 to form the first inner long flow channel 223 in the multiple groups of flow channels 220 of each shaped iron core 200, and the multiple long winding slots G13 of the multiple shaped punching sheets 210 of each shaped iron core 200 are respectively connected along the axial direction of the drive motor 100 to form the first inner short flow channel 222 in the multiple groups of flow channels 220 of each shaped iron core 200.

[0098] Two types of winding slots G12 and G13 are machined on the inner circumference of each special-shaped punching sheet 210 to form the structure of two inner-layer flow channels for each special-shaped iron core 200. Therefore, by only machining a single groove G11 on the outer circumference of each special-shaped punching sheet 210 and reusing the winding slots G12 and G13 of each special-shaped punching sheet 210, it is possible to achieve a layout of two inner and outer layers of flow channels for each special-shaped iron core 200, which helps to reduce the number and area of openings in each special-shaped punching sheet 210 and increase the contact area between two adjacent special-shaped punching sheets 210. Furthermore, it is possible to achieve a firm connection between two adjacent special-shaped punching sheets 210 through gluing or welding processes, which helps to improve the reliability of the stator core 111.

[0099] In addition, the winding slots of each special-shaped punching sheet 210 are reused as the structure of two inner layer flow channels of each special-shaped iron core 200, so that the stator winding 112 can be immersed in cooling, which helps to improve the heat dissipation effect of the motor stator 110.

[0100] In one embodiment, Figure 8 As shown, the width W3 of the stator winding 112 along the circumferential direction of the drive motor 100 is respectively smaller than the minimum width W of each first inner layer long flow channel 223. min The width W of each first inner short channel 222 min .

[0101] The stator winding 112 passes through the first inner long channel 223 and the first inner short channel 222, respectively, and is wound around the stator core 111. Along the circumference of the drive motor 100, there are gaps between the stator winding 112 and the first inner long channel 223 and the first inner short channel 222, respectively. These gaps can serve as dedicated cooling oil circuits. Thus, the first inner long channel 223 and the first inner short channel 222 not only serve as winding slots for accommodating the stator winding 112, but also form dedicated cooling oil circuits with the stator winding 112. Furthermore, the cooling oil can not only cool the stator core 111, but also immerse the stator winding 112, helping to improve the heat dissipation of the motor stator 110.

[0102] In one embodiment, Figure 5 As shown, the outer circumferential surface S2 of each special-shaped iron core 200 includes a plurality of oil collecting grooves 230, and the plurality of oil collecting grooves 230 are arranged at intervals along the circumference of the drive motor 100. The concave direction of each oil collecting groove 230 is away from the outer circumferential surface S2 of each special-shaped iron core 200, that is, the direction of the notch of each oil collecting groove 230 is away from the outer circumferential surface S2 of each special-shaped iron core 200. In addition, each oil collecting groove 230 of each special-shaped iron core 200 is used to connect the first outer layer flow channel 221 of the multiple groups of flow channels 220. For example, Figure 5 As shown, the bottom of each oil collecting groove 230 includes the first outer layer flow channels 221 of the multiple groups of flow channels 220. In other words, the first outer layer flow channels 221 of the multiple groups of flow channels 220 are connected to the oil collecting groove 230 through the bottom of the oil collecting groove 230. Therefore, the oil collecting groove 230 of each special-shaped iron core 200 can collect a large amount of cooling oil, ensuring that sufficient cooling oil is provided to the outer axial flow channels of the special-shaped iron core 200.

[0103] In one embodiment, Figure 5As shown, the outer circumferential surface S12 of each special-shaped punching sheet 210 includes multiple wide grooves G14. The multiple wide grooves G14 are spaced apart along the circumference of the drive motor 100. The concave direction of each groove G14 points away from the outer circumferential surface S12 of each special-shaped punching sheet 210. Multiple grooves G11 are distributed at the bottom of each wide groove G14. When there is only one special-shaped punching sheet 210 in each special-shaped iron core 200, the multiple wide grooves G14 of the special-shaped punching sheet 210 form multiple oil collecting grooves 230 in each special-shaped iron core 200. When there are multiple special-shaped punching sheets 210 in each special-shaped iron core 200, the multiple wide grooves G14 of the multiple special-shaped punching sheets 210 in each special-shaped iron core 200 are connected along the axial direction of the drive motor 100 to form multiple oil collecting grooves 230 in the multiple groups of flow channels 220 in each special-shaped iron core 200. A wide groove G14 is machined on the outer peripheral surface S12 of each special-shaped punching sheet 210 as a structure for forming the oil collecting groove 230 of each special-shaped iron core 200 , thereby simplifying the machining process of the oil collecting groove 230 of each special-shaped iron core 200 .

[0104] In one embodiment, Figure 7 As shown, the multiple oil collecting grooves 230 on the outer circumferential surfaces S2 of the two special-shaped iron cores 200 are staggered along the circumference of the drive motor 100, and the multiple oil collecting grooves 230 on the outer circumferential surfaces S2 of the two special-shaped iron cores 200 are partially connected along the axial direction of the drive motor 100. Therefore, in addition to the inner and outer layers of flow channels, the multiple oil collecting grooves 230 on the outer circumferential surfaces S2 of the two special-shaped iron cores 200 can also form multiple axial flow channels to cool the stator core 111, thereby improving the heat dissipation effect of the stator core 111.

[0105] Figure 9 Another schematic diagram of the stator core provided in the embodiment of the present application. In one embodiment, as Figure 9 As shown, the stator core 111 further includes a conventional core 300, and two special-shaped cores 200 are arranged on the same side of the conventional core 300 along the axial direction of the drive motor 100. Figure 9 As shown, the conventional iron core 300 includes a center hole O2. Along the axial direction of the drive motor 100, the center hole O2 of the conventional iron core 300 is connected to the center holes O1 of the two special-shaped iron cores 200 to form the center hole O of the stator iron core 111. In the embodiment of the present application, the hole wall of the center hole O2 of the conventional iron core 300 is the inner circumferential surface S3 of the conventional iron core 300.

[0106] Figure 10 A schematic diagram of a conventional punching sheet provided in an embodiment of the present application. The conventional iron core 300 includes a plurality of conventional punching sheets 310, which are arranged in sequence along the axial direction of the drive motor 100. Figure 10As shown, each conventional punching sheet 310 includes a center hole O22. The center holes O22 of the plurality of conventional punching sheets 310 of the conventional iron core 300 are connected along the axial direction of the drive motor 100 to form the center hole O2 of the conventional iron core 300. The hole walls of the center holes O22 of the plurality of conventional punching sheets 310 of the conventional iron core 300 form the inner circumferential surface S3 of the conventional iron core 300. The hole walls of the center hole O22 of each conventional punching sheet 310 form the inner circumferential surface S31 of each conventional punching sheet 310.

[0107] The conventional core 300 includes an outer flow channel and an inner flow channel. The outer flow channel of the conventional core 300 receives cooling oil from the outer flow channel of the shaped core 200, while the inner flow channel of the conventional core 300 receives cooling oil from the inner flow channel of the shaped core 200. In other words, the flow channels in the conventional core 300 function as cooling oil circuits. Consequently, the coolant in the inner and outer flow channels of the shaped core 200 can also flow into the inner and outer flow channels of the adjacent conventional core 300, achieving dual cooling of the conventional core 300, thereby improving the heat dissipation of the stator core 111.

[0108] like Figure 9 As shown, the conventional iron core 300 includes a plurality of second outer runners 320 , which are spaced apart along the circumference of the drive motor 100 , and each first outer runner 221 is used to connect to one or more second outer runners 320 .

[0109] like Figure 10 As shown, each conventional punching sheet 310 also includes an outer peripheral surface S41, and the outer peripheral surface S41 of each conventional punching sheet 310 is arranged opposite to the inner peripheral surface S31 along the radial direction of the drive motor 100. The outer peripheral surfaces S41 of the multiple conventional punching sheets 310 of the conventional iron core 300 form the outer peripheral surface S4 of the conventional iron core 300. In one embodiment, the outer peripheral surface S41 of each conventional punching sheet 310 includes a plurality of grooves G21, and the plurality of grooves G21 are spaced apart along the circumference of the drive motor 100, and the concave direction of each groove G21 is away from the outer peripheral surface S41 of the conventional punching sheet 310. The plurality of grooves G21 of the plurality of conventional punching sheets 310 of the conventional iron core 300 are respectively connected along the axial direction of the drive motor 100 to form a plurality of second outer layer flow channels 320 of the conventional iron core 300.

[0110] A groove G21 is processed on the outer peripheral surface S41 of each conventional punching sheet 310 as a structure for forming the outer layer flow channel of the conventional iron core 300. Therefore, it is only necessary to process a groove G21 separately on the outer peripheral surface S41 of each conventional punching sheet 310 to realize the layout of the outer layer flow channel of the conventional iron core 300, thereby simplifying the processing technology of each conventional punching sheet 310.

[0111] In one embodiment, the plurality of second outer runners 320 of the conventional iron core 300 are divided into multiple groups. Each group of second outer runners 320 includes multiple second outer runners 320. The spacing between two adjacent groups of second outer runners 320 along the circumference of the drive motor 100 is greater than the spacing between two adjacent second outer runners 320 in the same group. This simplifies the manufacturing process of the second outer runners 320 of the conventional iron core 300 and ensures uniform cooling of the conventional iron core 300 along the circumference of the drive motor 100.

[0112] like Figure 9 As shown, the conventional iron core 300 includes a plurality of second inner runners 330, which are spaced apart along the circumference of the drive motor 100. Each first inner short runner 222 of one of the two special-shaped iron cores 200a is used to connect to one of the two second inner runners 330 of the conventional iron core 300, and each first inner long runner 223 is used to connect to the other of the two second inner runners 330.

[0113] Figure 11 for Figure 10 FIG. 1 is an enlarged schematic diagram of part B of a conventional punching sheet. Figure 10 and Figure 11 As shown, the inner circumferential surface S31 of each conventional punching sheet 310 includes a plurality of winding slots G22, which are spaced apart along the circumference of the drive motor 100. Each winding slot G22 is used to accommodate the stator winding 112. A slot wall G221 of each winding slot G22 includes a groove G23, and the groove G23 in each winding slot G22 is recessed away from the slot wall G221 of each winding slot G22. The plurality of winding slots G22 of the plurality of conventional punching sheets 310 and the grooves G23 in the plurality of winding slots G22 are connected along the axial direction of the drive motor 100 to form a plurality of second inner layer flow channels 330.

[0114] A groove G23 is separately machined in the slot wall G221 of the winding slot G22 of each conventional punching sheet 310 to form a dedicated cooling oil path for the conventional iron core 300 , thereby enabling immersion cooling of the stator winding 112 and helping to improve the heat dissipation effect of the motor stator 110 .

[0115] Furthermore, by only machining a groove G23 in the slot wall G221 of the winding slot G22 of each conventional punching sheet 310 and reusing the winding slot G22 of each conventional punching sheet 310, the layout of the inner flow channel of the conventional iron core 300 can be realized, which helps to reduce the number and area of openings in each conventional punching sheet 310 and increase the contact area between two adjacent conventional punching sheets 310. Furthermore, it is possible to achieve a firm connection between two adjacent conventional punching sheets 310 through gluing or welding, which helps to improve the reliability of the stator iron core 111.

[0116] In one embodiment, the width W4 of each second inner flow channel 330 along the circumference of the drive motor 100 is variable along the radial direction of the drive motor 100. For example, Figure 11 As shown, the minimum value W4 of the width W4 of the second inner channel 330 along the circumference of the drive motor 100 is min is the width of the winding slot G22 along the circumferential direction of the drive motor 100, and the maximum value W4 of the width W4 of each second inner layer flow channel 330 along the circumferential direction of the drive motor 100 is max It is the sum of the width of the winding slot G22 and the depth of the groove G23.

[0117] In one embodiment, the width W3 of the stator winding 112 along the circumference of the drive motor 100 is approximately equal to the minimum width W4 of each second inner layer flow channel 330. min When the stator winding 112 passes through the second inner channel 330 and is wound around the stator core 111, a gap exists between the stator winding 112 and the second inner channel 330 along the circumference of the drive motor 100, as shown in FIG. Figure 11 As shown, a gap can be formed between the stator winding 112 and the bottom of the groove G23, which can serve as a dedicated cooling oil path. Thus, the second inner flow channel 330 not only serves as a winding slot to accommodate the stator winding 112, but also forms a dedicated cooling oil path between the stator winding 112. Furthermore, the cooling oil not only cools the stator core 111 but also immerses the stator winding 112, helping to improve the heat dissipation of the motor stator 110.

[0118] Figure 12 for Figure 9 A schematic diagram of the cooperation between a conventional iron core and a special-shaped iron core in the stator iron core shown. In one embodiment, along the axial direction of the drive motor 100, the projected area of each second outer layer flow channel 320 is less than or equal to the projected area of each first outer layer flow channel 221. Figure 12As shown, the width of each second outer flow channel 320 along the circumference of the drive motor 100 is smaller than the width of each first outer flow channel 221, and the length of each second outer flow channel 320 along the radial direction of the drive motor 100 is smaller than the length of each first outer flow channel 221. Compared to the first outer flow channels 221, the second outer flow channels 320 have a smaller projected area, thereby increasing the flow rate of the cooling oil in the second outer flow channels 320, thereby improving the heat dissipation effect of the stator core 111.

[0119] In one embodiment, the projected area of each second inner flow channel 330 along the axial direction of the drive motor 100 is less than or equal to the projected area of each first inner short flow channel 222 and the projected area of each first inner long flow channel 223. Figure 12 As shown, the maximum width W4max of each second inner layer flow channel 330 along the circumference of the drive motor 100 is approximately equal to the width W of each first inner layer short flow channel 222. min , the minimum width W of each first inner layer long flow channel 223 min , and along the radial direction of the drive motor 100, the length of each second inner runner 330 is less than the length of each first inner long runner 223 and approximately equal to the length of each first inner short runner 222. Compared to the first inner short runners 222 and the first inner long runners 223, the second inner runners 330 have a smaller projected area, thereby increasing the flow rate of the cooling oil in the second inner runners 330, thereby improving the heat dissipation effect of the stator core 111.

[0120] In one embodiment, the number of special-shaped punching sheets 210 in each special-shaped iron core 200 is less than the number of regular punching sheets 310 in the regular iron core 300 .

[0121] Each set of flow channels 220 in each special-shaped iron core 200 functions as a drainage oil circuit and a shunt oil circuit. The inner and outer layers of flow channels in the conventional iron core 300 are connected to the inner and outer layers of flow channels of the adjacent special-shaped iron core 200, respectively. That is, the flow channels in the conventional iron core 300 function as cooling oil circuits. Therefore, compared to the conventional iron core 300, by making the special-shaped iron core 200 thinner, that is, by making the number of special-shaped punchings 210 in the special-shaped iron core 200 smaller, the drainage oil circuit and the shunt oil circuit in the stator core 111 can be shortened, and the cooling oil circuit in the stator core 111 can be lengthened. Furthermore, by rationally arranging the lengths of the various oil circuits in the stator core 111, the heat dissipation effect of the stator core 111 can be improved.

[0122] Figure 13 and Figure 14 Another schematic diagram of the stator core provided in the embodiment of the present application is shown in FIG. Figure 13As shown, the stator core 111 also includes two conventional cores 300. The two special-shaped cores 200 are arranged between the two conventional cores 300 along the axial direction of the drive motor 100. Each first outer runner 221 of each special-shaped core 200 is used to connect to one or more second outer runners 320 of an adjacent conventional core 300. Each first inner short runner 222 of each special-shaped core 200 is used to connect to one of two adjacent second inner runners 330 in an adjacent conventional core 300, and each first inner long runner 223 of each special-shaped core 200 is used to connect to the other of two adjacent second inner runners 330 in an adjacent conventional core 300.

[0123] like Figure 14 As shown, the first outer layer flow channel 221b of each special-shaped core 200 and the second outer layer flow channel 320 of the adjacent conventional core 300 form two oil circuits OC1 and OC2 on the outer layer of the stator core 111. The cooling oil in the two oil circuits OC1 and OC2 on the outer layer of the stator core 111 flows in opposite directions. Therefore, the cooling oil in the first outer layer flow channel 221b of each special-shaped core 200 is divided and flows into the two oil circuits OC1 and OC2 on the outer layer of the stator core 111, cooling the outer layers of the two conventional cores 300 of the stator core 111 respectively. Figure 14 The first inner layer long flow channel 223a of one of the two special-shaped iron cores 200a and the second inner layer flow channel 330 of the adjacent conventional iron core 300 form an oil circuit IC1 in the inner layer of the stator core 111, and the first inner layer short flow channel 222b of the other special-shaped iron core 200b of the two special-shaped iron cores 200 and the second inner layer flow channel 330 of the adjacent conventional iron core 300 form another oil circuit IC2 in the inner layer of the stator core 111. The flow directions of the cooling oil in the two oil circuits IC1 and IC2 in the inner layer of the stator core 111 are opposite. Consequently, cooling oil flows along the first outer flow channel 221b of the special-shaped core 200b into the first inner long flow channel 223a of the special-shaped core 200a. The cooling oil flowing into the first inner long flow channel 223a of the special-shaped core 200a is then divided and flows into the two inner oil circuits IC1 and IC2 of the stator core 111, respectively cooling the inner layers of the two conventional cores 300 of the stator core 111. Consequently, the cooling oil can cool both conventional cores 300, both inside and outside, improving the heat dissipation of the stator core 111. Furthermore, the cooling oil in the two inner oil circuits IC1 and IC2 of the stator core 111 can also cool the stator winding 112 of the stator core 111, further improving the heat dissipation of the stator winding 112.

[0124] about Figure 13 and Figure 14For matters not described in the stator core shown, such as the structure of the conventional core 300, the structure of the special-shaped core 200, and the relationship between the inner and outer oil channels between the conventional core 300 and the adjacent special-shaped core 200, please refer to the relevant description above and will not be repeated here.

[0125] Figure 15 Another schematic diagram of the stator core provided in an embodiment of the present application. In one embodiment, the stator core 111 further includes a conventional core 300 and a conventional core 500. The conventional sub-core 500 is arranged on the side of the conventional core 300 away from the two special-shaped cores 200 along the axial direction of the drive motor 100. The conventional core 500 includes a center hole O4. Along the axial direction of the drive motor 100, the center hole O4 of the conventional core 500, the center hole O2 of the conventional core 300, and the center holes O1 of the two special-shaped cores 200 are sequentially connected to form the center hole O of the stator core 111. In the embodiment of the present application, the hole wall of the center hole O4 of the conventional core 500 is the inner circumferential surface S6 of the conventional core 500.

[0126] Figure 16 Another schematic diagram of conventional punching sheets provided in an embodiment of the present application. The conventional iron core 500 includes one or more conventional punching sheets 510, and the plurality of conventional punching sheets 510 are arranged in sequence along the axial direction of the drive motor 100. Figure 16 As shown, each conventional punching sheet 510 includes a center hole O44. When the number of conventional punching sheets 510 in the conventional iron core 500 is one, as shown in FIG. Figure 16 As shown, the center hole O44 of the conventional punching sheet 510 is the center hole O4 of the conventional iron core 500, and the hole wall of the center hole O44 of the conventional punching sheet 510 is the inner circumferential surface S6 of the conventional iron core 500. When the conventional iron core 500 has multiple conventional punching sheets 510, the center holes O44 of the multiple conventional punching sheets 510 of the conventional iron core 500 are connected along the axial direction of the drive motor 100 to form the center hole O4 of the conventional iron core 500, and the hole wall of the center hole O44 of the multiple conventional punching sheets 510 of the conventional iron core 500 forms the inner circumferential surface S6 of the conventional iron core 200.

[0127] like Figure 15 and Figure 16 As shown, the conventional iron core 500 includes a plurality of third outer flow channels 520, which are spaced apart along the circumference of the drive motor 100. Each third outer flow channel 520 is used to communicate with one or more second outer flow channels 320. Thus, each third outer flow channel 520 is used to receive cooling oil transmitted by one or more second outer flow channels 320, thereby improving the heat dissipation effect of the conventional iron core 500.

[0128] like Figure 16As shown, the conventional punching sheet 510 includes an outer peripheral surface S71, and the outer peripheral surface S71 and the inner peripheral surface S61 of the conventional punching sheet 510 are arranged opposite to each other along the radial direction of the drive motor. Figure 16 As shown, the outer circumferential surface S71 of the conventional punching sheet 510 is the outer circumferential surface S7 of the conventional core 500. If the conventional core 500 has multiple conventional punching sheets 510, the outer circumferential surfaces S71 of the multiple conventional punching sheets 510 form the outer circumferential surface S7 of the conventional core 500.

[0129] In one embodiment, Figure 16 As shown, the outer circumferential surface S71 of the conventional punching sheet 510 includes a plurality of grooves G41, which are spaced apart along the circumference of the drive motor 100, and the concave direction of each groove G41 is away from the outer circumferential surface S71 of each conventional punching sheet 510. When the number of conventional punching sheets 510 of the conventional iron core 500 is one, as shown in FIG. Figure 16 As shown, the multiple grooves G41 of the conventional punching sheet 510 form multiple third outer runners 520 of the conventional iron core 500. When the conventional iron core 500 has multiple conventional punching sheets 510, the multiple grooves G41 of the multiple conventional punching sheets 510 of the conventional iron core 500 are connected along the axial direction of the drive motor 100 to form multiple third outer runners 520 of the conventional iron core 500. Thus, the outer peripheral surface S71 of each conventional punching sheet 510 is processed with a groove G41 as the structure forming the outer runner of the conventional iron core 500, simplifying the processing technology of the outer runner of the conventional iron core 500.

[0130] like Figure 15 and Figure 16 As shown, the conventional iron core 500 further includes a plurality of third inner flow channels 530, which are spaced apart along the circumference of the drive motor 100. Each third inner flow channel 530 is connected to a second inner flow channel 330. Thus, each third inner flow channel 530 is used to receive cooling oil transmitted by a second inner flow channel 330, thereby improving the heat dissipation effect of the conventional iron core 500.

[0131] In one embodiment, the plurality of third inner runners 530 are divided into two groups, one group of third inner runners 530 includes a plurality of third inner short runners 530a, and the other group of third inner runners 530 includes a plurality of third inner long runners 530b. Each third inner short runner 530a is arranged adjacent to a third inner long runner 530b along the circumference of the drive motor 100, and the length of each third inner long runner 530b is greater than the length of each third inner short runner 530a along the radial direction of the drive motor 100. In this embodiment, the runners of the conventional core 500 are similar to those of the special-shaped core 200. The conventional punchings 510 of the conventional core 500 can be further processed based on the special-shaped punchings 210 of the special-shaped core 200, thereby simplifying the processing process of the stator core 111.

[0132] In addition, the third inner layer short flow channel 530a is used to connect to one second inner layer flow channel 330, and the third inner layer long flow channel 530b is used to connect to another second inner layer flow channel 330. Thus, each third inner layer short flow channel 530a is used to receive cooling oil transmitted by one second inner layer flow channel 330, and each third inner layer long flow channel 530b is used to receive cooling oil transmitted by another second inner layer flow channel 330, thereby improving the heat dissipation effect of the conventional iron core 500.

[0133] In one embodiment, each third inner short flow channel 530a is spaced apart from one third outer flow channel 520 along the radial direction of the drive motor 100. Figure 15 As shown, along the radial direction of the drive motor 100 , the third inner short flow channel 530 a is distributed between the third outer flow channel 520 and the central hole O4 of the conventional iron core 500 .

[0134] In one embodiment, Figure 16 As shown, the inner circumferential surface S61 of each conventional punching sheet 510 includes a plurality of short winding slots G42 and a plurality of long winding slots G43. Each short winding slot G42 and each long winding slot G43 are respectively used to accommodate the stator winding 112. Each short winding slot G42 is adjacent to a long winding slot G43 along the circumference of the drive motor 100, and each short winding slot G42 is spaced apart from a groove G41 along the radial direction of the drive motor 100. The slot depth of each long winding slot G43 is greater than the slot depth of each short winding slot G42.

[0135] When the number of conventional punching sheets 510 of each conventional iron core 500 is one, as shown in FIG. Figure 16 As shown, the multiple short winding slots G42 of the conventional punching sheet 510 form multiple third inner short runners 530 a of the conventional iron core 500 , and the multiple short winding slots G43 of the conventional punching sheet 510 form multiple third inner long runners 530 b of the conventional iron core 500 .

[0136] When the number of conventional punching sheets 510 of each conventional iron core 500 is multiple, the multiple short winding slots G42 of the multiple conventional punching sheets 510 of the conventional iron core 500 are respectively connected along the axial direction of the drive motor 100 to form multiple third inner layer short flow channels 530a of the conventional iron core 500, and the multiple long winding slots G43 of the multiple conventional punching sheets 510 of the conventional iron core 500 are respectively connected along the axial direction of the drive motor 100 to form multiple third inner layer long flow channels 530b of the conventional iron core 500.

[0137] In one embodiment, Figure 16 As shown, the outer circumferential surface of the conventional iron core 500 includes a plurality of oil storage grooves 540. The plurality of oil storage grooves 540 are arranged at intervals along the circumference of the drive motor 100. The recessed direction of each oil storage groove 540 is away from the outer circumferential surface S7 of the conventional iron core 500. Each oil storage groove 540 of the conventional iron core 500 is used to communicate with the plurality of second outer layer flow channels 320. Thus, the oil storage grooves 540 of the conventional iron core 500 can store cooling oil, thereby avoiding waste of cooling oil.

[0138] Figure 17 for Figure 15 A schematic diagram of the coordination between two conventional cores in the stator core shown in FIG. Figure 17 As shown, along the axial direction of the drive motor 100, the projected area of each third outer layer flow channel 520 is larger than the projected area of each second outer layer flow channel 320. Figure 17 As shown, the width of each third outer layer flow channel 520 along the circumference of the drive motor 100 is greater than the width of each second outer layer flow channel 320, and the length of each third outer layer flow channel 520 along the radial direction of the drive motor 100 is greater than the length of each second outer layer flow channel 320. Compared with the second outer layer flow channels 320, the second outer layer flow channels 320 have a larger projected area, thereby reducing the flow rate of the cooling oil in the third outer layer flow channels 520, thereby ensuring sufficient coolant to cool the conventional iron core 300.

[0139] In one embodiment, Figure 17 As shown, the projected area of each third inner flow channel 530 along the axial direction of the drive motor 100 is larger than the projected area of each second inner flow channel 330. Compared to the second inner flow channels 330, the larger projected area of the third inner flow channels 530 reduces the flow rate of the cooling oil in the third inner flow channels 530, thereby ensuring sufficient coolant to cool the conventional iron core 300.

[0140] Figure 18Another schematic diagram of a stator core provided in an embodiment of the present application. In one embodiment, the stator core 111 further includes two conventional cores 300 and two conventional cores 500. Each conventional core 500 is arranged on the side of a conventional core 300 away from the two special-shaped cores 200 along the axial direction of the drive motor 100. Each third outer layer flow channel 520 of each conventional core 500 is used to connect one or more second outer layer flow channels 320 of an adjacent conventional core 300. Each third inner layer flow channel 530 of each conventional core 500 is used to connect one second inner layer flow channel 330 in an adjacent conventional core 300.

[0141] The first outer flow channel 221b of each special-shaped core 200, the second outer flow channel 320 of a conventional core 300, and the third outer flow channel 520 of a conventional core 500 form two oil paths for the outer layer of the stator core 111. The cooling oil in the two outer oil paths of the stator core 111 flows in opposite directions. Consequently, the cooling oil in the first outer flow channel 221b of each special-shaped core 200 is divided and flows into the two outer oil paths of the stator core 111, cooling the outer layers of the two conventional cores 300 and the outer layers of the two conventional cores 500 of the stator core 111, respectively.

[0142] The first inner layer long flow channel 223a of one of the two special-shaped iron cores 200a and the second inner layer flow channel 330 of the adjacent conventional iron core 300, and the third inner layer flow channel 530 of one conventional iron core 500 form an oil circuit in the inner layer of the stator iron core 111. The first inner layer short flow channel 222b of the other special-shaped iron core 200b of the two special-shaped iron cores 200 and the second inner layer flow channel 330 of the adjacent conventional iron core 300, and the third inner layer flow channel 530 of the other conventional iron core 500 form another oil circuit in the inner layer of the stator iron core 111. The cooling oil in the two oil circuits in the inner layer of the stator iron core 111 flows in opposite directions. As a result, cooling oil flows along the first outer flow channel 221b of the special-shaped iron core 200b into the first inner long flow channel 223a of the special-shaped iron core 200a. The cooling oil flowing into the first inner long flow channel 223a of the special-shaped iron core 200a is then divided into two oil paths within the inner layer of the stator core 111, cooling the inner layers of the two conventional iron cores 300 of the stator core 111 separately. Furthermore, the cooling oil can cool both the two conventional iron cores 300 and the two conventional iron cores 500, respectively, both inside and outside, improving the heat dissipation of the stator core 111. Furthermore, the cooling oil in the two inner oil paths of the stator core 111 can also cool the stator winding 112 of the stator core 111, improving the heat dissipation of the stator winding 112.

[0143] about Figure 18For matters not described in the stator core shown, such as the structure of the conventional core 300, the structure of the special-shaped core 200, the relationship between the inner and outer oil channels between the conventional core 300 and the adjacent special-shaped core 200, and the relationship between the inner and outer oil channels between the conventional core 300 and the adjacent conventional core 500, please refer to the relevant description above and will not be repeated here.

[0144] Figure 19 Another schematic diagram of the stator core provided in the embodiment of the present application. Figure 19 As shown, the stator core 111 further includes a conventional core 400, and two special-shaped cores 200 are arranged on the same side of the conventional core 400 along the axial direction of the drive motor 100. Figure 19 As shown, the conventional iron core 400 includes a center hole O3. Along the axial direction of the drive motor 100, the center hole O3 of the conventional iron core 400 is connected to the center holes O1 of the two special-shaped iron cores 200 to form the center hole O of the stator iron core 111. In the embodiment of the present application, the hole wall of the center hole O3 of the conventional iron core 400 is the inner circumferential surface S5 of the conventional iron core 300.

[0145] Figure 20 A schematic diagram of a conventional punching sheet provided in an embodiment of the present application. The conventional iron core 400 includes a plurality of conventional punching sheets 410, which are arranged in sequence along the axial direction of the drive motor 100. Figure 20 As shown, each conventional punching sheet 410 includes a center hole O33. The center holes O33 of the plurality of conventional punching sheets 410 of the conventional iron core 400 are connected along the axial direction of the drive motor 100 to form the center hole O3 of the conventional iron core 400. The hole walls of the center holes O33 of the plurality of conventional punching sheets 410 of the conventional iron core 400 form the inner circumferential surface S5 of the conventional iron core 300. The hole walls of the center hole O33 of each conventional punching sheet 410 form the inner circumferential surface S51 of each conventional punching sheet 310.

[0146] like Figure 19 As shown, the conventional iron core 400 includes a plurality of second outer runners 420 , which are spaced apart along the circumference of the drive motor 100 , and each first outer runner 221 is used to connect to one or more second outer runners 420 .

[0147] In one embodiment, Figure 20 As shown, each conventional punching sheet 410 includes a plurality of oil holes T, which are spaced apart along the circumference of the drive motor 100. Each oil hole T of each conventional punching sheet 410 passes through two end surfaces of each conventional punching sheet 410 that are arranged opposite to each other along the axial direction of the drive motor 100. The plurality of oil holes T of the plurality of conventional punching sheets 410 of the conventional iron core 400 are connected along the axial direction of the drive motor 100 to form a plurality of second outer layer flow channels 420 of the conventional iron core 400.

[0148] The oil hole T of each conventional punching sheet 410 serves as a structure for forming the outer flow channel of the conventional iron core 400. Thus, the cooling oil in the outer flow channel of the conventional iron core 400 can also be sprayed on the stator winding 112 wound around the stator iron core 111 to cool the stator iron core 111, thereby improving the heat dissipation effect of the stator iron core 111.

[0149] like Figure 19 As shown, the conventional iron core 400 includes a plurality of second inner runners 430, which are spaced apart along the circumference of the drive motor 100. Each first inner short runner 222 of one of the two special-shaped iron cores 200a is used to connect to one of the two second inner runners 430 of the conventional iron core 400, and each first inner long runner 223 is used to connect to the other of the two second inner runners 430.

[0150] Figure 21 for Figure 20 FIG. 1 is an enlarged schematic diagram of a conventional punching sheet shown in FIG. Figure 20 and Figure 21 As shown, the inner circumferential surface S51 of each conventional punching sheet 410 includes a plurality of winding slots G31, which are spaced apart along the circumference of the drive motor 100. Each winding slot G31 is used to accommodate the stator winding 112. A slot wall G311 of each winding slot G31 includes a groove G32, and the recessed direction of the groove G32 in each winding slot G31 is away from the slot wall G311 of each winding slot G31. The plurality of winding slots G31 of the plurality of conventional punching sheets 410 of the conventional iron core 400 and the grooves G32 in the plurality of winding slots G31 are respectively connected along the axial direction of the drive motor 100 to form a plurality of second inner layer flow channels 430 of the conventional iron core 400.

[0151] A groove G32 is separately machined in the slot wall G311 of the winding slot G31 of each conventional punching sheet 410 to form a dedicated cooling oil path for the conventional iron core 400 , thereby enabling immersion cooling of the stator winding 112 and helping to improve the heat dissipation effect of the motor stator 110 .

[0152] Furthermore, by only machining a groove G32 on the wall G311 of the winding slot G31 of each conventional punching sheet 410 and reusing the winding slot G31 of each conventional punching sheet 410, the layout of the inner flow channel of the conventional iron core 400 can be realized, which helps to reduce the number and area of openings in each conventional punching sheet 410 and increase the contact area between two adjacent conventional punching sheets 410. Furthermore, it is possible to achieve a firm connection between two adjacent conventional punching sheets 410 through gluing or welding, which helps to improve the reliability of the stator iron core 111.

[0153] In one embodiment, the width W5 of each second inner flow channel 430 along the circumference of the drive motor 100 is variable along the radial direction of the drive motor 100. For example, Figure 21 As shown, the minimum value W5 of the width W5 of the second inner channel 430 along the circumference of the drive motor 100 is min is the width of the winding slot G31 along the circumferential direction of the drive motor 100, and the maximum value W5 of the width W5 of each second inner layer flow channel 430 along the circumferential direction of the drive motor 100 is max It is the sum of the width of the winding slot G31 and the depth of the groove G32.

[0154] In one embodiment, the width W3 of the stator winding 112 along the circumference of the drive motor 100 is approximately equal to the minimum width W5 of each second inner layer flow channel 430. min When the stator winding 112 passes through the second inner layer flow channel 430 and is wound around the stator core 111, a gap exists between the stator winding 112 and the second inner layer flow channel 430 along the circumference of the drive motor 100, as shown in FIG. Figure 21 As shown, a gap exists between the stator winding 112 and the bottom of the groove G32, which can serve as a dedicated cooling oil path. Thus, the second inner flow channel 430 not only serves as a winding slot to accommodate the stator winding 112, but also forms a dedicated cooling oil path with the stator winding 112. Furthermore, the cooling oil not only cools the stator core 111 but also immerses the stator winding 112, helping to improve the heat dissipation of the motor stator 110.

[0155] Figure 22 for Figure 19 A schematic diagram of the cooperation between a conventional iron core and a special-shaped iron core in the stator iron core is shown. In one embodiment, as Figure 22 As shown, along the axial direction of the drive motor 100, the projected area of each second outer flow channel 420 is less than or equal to the projected area of each first outer flow channel 221. Compared to the first outer flow channels 221, the projected area of the second outer flow channels 420 is smaller, thereby increasing the flow rate of the cooling oil in the second outer flow channels 420, thereby improving the heat dissipation effect of the stator core 111.

[0156] In one embodiment, the projected area of each second inner flow channel 430 along the axial direction of the drive motor 100 is less than or equal to the projected area of each first inner short flow channel 222 and the projected area of each first inner long flow channel 223. Figure 22 As shown, the maximum width W5 of each second inner channel 430 along the circumference of the drive motor 100 is max are approximately equal to the width W of each first inner short channel 222 min The minimum width W5 of each first inner layer long flow channel 223 min, and along the radial direction of the drive motor 100, the length of each second inner runner 430 is less than the length of each first inner long runner 223 and approximately equal to the length of each first inner short runner 222. Compared to the first inner short runners 222 and the first inner long runners 223, the second inner runners 430 have a smaller projected area, thereby increasing the flow rate of the cooling oil in the second inner runners 430, thereby improving the heat dissipation effect of the stator core 111.

[0157] In one embodiment, the number of special-shaped punching sheets 210 in each special-shaped iron core 200 is less than the number of regular punching sheets 410 in the regular iron core 400 .

[0158] Each set of flow channels 220 in each special-shaped iron core 200 functions as a drainage oil circuit and a shunt oil circuit. The inner and outer layers of flow channels on the conventional iron core 400 are respectively connected to the inner and outer layers of flow channels of the adjacent special-shaped iron core 200, that is, the flow channels in the conventional iron core 400 function as cooling oil circuits. Therefore, compared to the conventional iron core 400, by making the special-shaped iron core 200 thinner, that is, by making the number of special-shaped punchings 210 of the special-shaped iron core 200 smaller, the drainage oil circuit and the shunt oil circuit in the stator core 111 can be shortened, and the cooling oil circuit in the stator core 111 can be lengthened. Furthermore, by rationally arranging the lengths of the various oil circuits in the stator core 111, the heat dissipation effect of the stator core 111 can be improved.

[0159] Figure 23 and Figure 24 Another schematic diagram of the stator core provided in the embodiment of the present application is shown in FIG. Figure 23 As shown, the stator core 111 further includes two conventional cores 400. The two special-shaped cores 200 are arranged between the two conventional cores 400 along the axial direction of the drive motor 100. Figure 24 As shown, the first outer layer flow channel 221b of each special-shaped iron core 200 is connected to the second outer layer flow channel 420 of the adjacent conventional iron core 400 to form two oil paths of the outer layer of the stator core 111. The cooling oil of the two oil paths of the outer layer of the stator core 111 flows in opposite directions. Therefore, the cooling oil of the first outer layer flow channel 221b of each special-shaped iron core 200 is divided into the two oil paths of the outer layer of the stator core 111, cooling the outer layers of the two conventional iron cores 300 of the stator core 111 respectively. Figure 24The first inner layer long flow channel 223a of one of the two special-shaped iron cores 200a and the second inner layer flow channel 430 of the adjacent conventional iron core 400 are connected to form an oil circuit IC3 in the inner layer of the stator core 111. The first inner layer short flow channel 222b of the other special-shaped iron core 200b of the two special-shaped iron cores 200 and the second inner layer flow channel 430 of the adjacent conventional iron core 400 are connected to form another oil circuit IC4 in the inner layer of the stator core 111. The flow directions of the cooling oil in the two oil circuits IC3 and IC4 in the inner layer of the stator core 111 are opposite. As a result, cooling oil flows along the first outer flow channel 221b of the special-shaped iron core 200b into the first inner long flow channel 223a of the special-shaped iron core 200a. The cooling oil flowing into the first inner long flow channel 223a of the special-shaped iron core 200a is then divided and flows into the two inner oil circuits IC3 and IC4 of the stator core 111, respectively cooling the inner layers of the two conventional iron cores 400 of the stator core 111. This allows for dual cooling of the two conventional iron cores 300, both inside and outside, improving the heat dissipation of the stator core 111. Furthermore, the cooling oil in the two inner oil circuits IC3 and IC4 of the stator core 111 can also cool the stator winding 112 of the stator core 111, further improving the heat dissipation of the stator winding 112.

[0160] about Figure 23 and Figure 24 For matters not described in the stator core shown, such as the structure of the conventional core 400, the structure of the special-shaped core 200, and the relationship between the inner and outer oil channels between the conventional core 400 and the adjacent special-shaped core 200, please refer to the relevant description above and will not be repeated here.

[0161] Figure 25 Another schematic diagram of the stator core provided in the embodiment of the present application. In one embodiment, as Figure 25As shown, the stator core 111 further includes a conventional core 300 and a conventional core 400. The conventional core 400, the conventional core 300, the special-shaped core 200a, and the special-shaped core 200b are arranged in sequence along the axial direction of the drive motor 100. Each second outer runner 420 of the conventional core 400 communicates with one or more second outer runners 320 of the conventional core 300, and the plurality of second inner runners 330 of the conventional core 300 communicate with the plurality of second inner runners 430 of the conventional core 400. In addition, each first outer layer runner 221a of the special-shaped iron core 200a is used to connect one or more second outer layer runners 320 of the conventional iron core 300, each first inner layer short runner 222 of the special-shaped iron core 200a is used to connect one second inner layer runner 330 of two adjacently arranged second inner layer runners 330 in the conventional iron core 300, and each first inner layer long runner 223 of the special-shaped iron core 200a is used to connect the other second inner layer runner 330 of two adjacently arranged second inner layer runners 330 in the conventional iron core 300.

[0162] Figure 26 for Figure 25 Another schematic diagram of the stator core is shown. Figure 27 for Figure 26 In one embodiment, the projected area of each second inner flow channel 430 of the conventional core 400 along the axial direction of the drive motor 100 is less than or equal to the projected area of each first inner flow channel 330 of the conventional core 300. Figure 26 and Figure 27 As shown, the projected area of each second inner flow channel 430 of the conventional iron core 400 along the axial direction of the drive motor 100 is smaller than the projected area of each first inner flow channel 330 of the conventional iron core 300. Compared to the first inner flow channels 330 of the conventional iron core 300, the projected area of the second inner flow channels 430 of the conventional iron core 400 is smaller, thereby increasing the flow rate of the cooling oil in the second inner flow channels 430 of the conventional iron core 400, thereby improving the heat dissipation effect of the stator core 111.

[0163] about Figure 25 and Figure 26 For matters not described in the stator core shown, such as the structure of the conventional core 300, the structure of the conventional core 400, the structure of the special-shaped core 200, and the relationship between the inner and outer oil channels between the conventional core 300 and the adjacent special-shaped core 200, please refer to the relevant description above and will not be repeated here.

[0164] Figure 28 and Figure 29 Another schematic diagram of the stator core provided in the embodiment of the present application is shown in FIG. Figure 28As shown, the stator core 111 further includes two conventional cores 300 and two conventional cores 400. Along the axial direction of the drive motor 100, one conventional core 400, one conventional core 300, a special-shaped core 200a, a special-shaped core 200b, another conventional core 300, and another conventional core 400 are arranged in sequence.

[0165] like Figure 29 As shown, the first outer layer flow channel 221a of the special-shaped iron core 200a is respectively connected with the second outer layer flow channel 320 of a conventional iron core 300 and the second outer layer flow channel 420 of a conventional iron core 400 to form an oil circuit OC4 of the outer layer of the stator core 111. The first outer layer flow channel 221b of the special-shaped iron core 200b is respectively connected with the second outer layer flow channel 320 of another conventional iron core 300 and the second outer layer flow channel 420 of another conventional iron core 400 to form an oil circuit OC5 of the outer layer of the stator core 111. Thus, the cooling oil in the first outer layer flow channel 221b of each special-shaped iron core 200 is divided into the two oil circuits OC4 and OC5 of the outer layer of the stator core 111, cooling the outer layers of the two conventional iron cores 300 and the two conventional iron cores 400 of the stator core 111 respectively. Continue to refer to Figure 29 The first inner layer long flow channel 223a of the special-shaped iron core 200a is connected to the second inner layer flow channel 330 of one conventional iron core 300 and the second inner layer flow channel 430 of one conventional iron core 400, respectively, to form an oil circuit IC6 in the inner layer of the stator core 111. The first inner layer short flow channel 222b of the special-shaped iron core 200b is connected to the second inner layer flow channel 330 of another conventional iron core 300 and the second inner layer flow channel 430 of another conventional iron core 400, respectively, to form another oil circuit IC7 in the inner layer of the stator core 111. As a result, cooling oil flows along the first outer flow channel 221b of the special-shaped iron core 200b into the first inner long flow channel 223a of the special-shaped iron core 200a. The cooling oil flowing into the first inner long flow channel 223a of the special-shaped iron core 200a is then divided and flows into the two inner oil circuits IC6 and IC7 of the stator core 111, respectively cooling the inner layers of the two conventional iron cores 300 and the two conventional iron cores 400 of the stator core 111. Furthermore, the two conventional iron cores 300 and the two conventional iron cores 400 can be cooled both inside and outside, improving the heat dissipation of the stator core 111. Furthermore, the cooling oil in the two inner oil circuits IC3 and IC4 of the stator core 111 can also cool the stator winding 112 of the stator core 111, improving the heat dissipation of the stator winding 112.

[0166] about Figure 32 and Figure 33For matters not described in the stator core shown, such as the structure of the conventional core 300, the structure of the conventional core 400, the structure of the special-shaped core 200, the structure of the conventional core 300, the structure of the conventional core 400, and the relationship between the inner and outer oil channels of the special-shaped core 200, please refer to the relevant description above and will not be repeated here.

[0167] Figure 30 and Figure 31 Another schematic diagram of the stator core provided in the embodiment of the present application is shown in FIG. Figure 30 As shown, the stator core 111 further includes a conventional core 300, a conventional core 400, and a conventional core 500. Along the axial direction of the drive motor 100, the conventional core 400, the conventional core 500, the conventional core 300, the special-shaped core 200a, and the special-shaped core 200b are arranged in sequence.

[0168] like Figure 31 As shown, the first outer layer flow channel 221b of each special-shaped core 200 is connected to the second outer layer flow channel 320 of the conventional core 300, the third outer layer flow channel 520 of the conventional core 500, and the second outer layer flow channel 420 of the conventional core 400, respectively, to form an oil path for the outer layer of the stator core 111. Thus, the cooling oil in the first outer layer flow channel 221b of each special-shaped core 200 flows into the oil path for the outer layer of the stator core 111, cooling the outer layers of one conventional core 300, one conventional core 500, and one conventional core 400 of the stator core 111, respectively. Figure 31 The first inner long flow channel 223a of one of the two special-shaped cores 200a is connected to the second inner flow channel 330 of the conventional core 300, the third inner flow channel 530 of the conventional core 500, and the second inner flow channel 430 of the conventional core 400, respectively, to form an oil circuit IC8 in the inner layer of the stator core 111. Consequently, cooling oil flows along the first outer flow channel 221b of the special-shaped core 200b into the first inner long flow channel 223a of the special-shaped core 200a. The cooling oil in the first inner long flow channel 223a of the special-shaped core 200a then flows into the oil circuit IC8 in the inner layer of the stator core 111, cooling the inner layers of the conventional cores 300, 500, and 400 of the stator core 111, respectively. Furthermore, conventional core 300, conventional core 500, and conventional core 400 can each be cooled internally and externally, thereby improving the heat dissipation effect of stator core 111. Furthermore, the cooling oil in oil circuit IC8 within the inner layer of stator core 111 can also cool stator winding 112 of stator core 111, thereby improving the heat dissipation effect of stator winding 112.

[0169] about Figure 30 and Figure 31For matters not described in the stator core shown, such as the structure of the conventional core 300, the structure of the conventional core 400, the structure of the conventional core 500, the structure of the special-shaped core 200, the relationship between the inner and outer oil channels between the conventional core 300 and the special-shaped core 200, the relationship between the inner and outer oil channels between the conventional core 300 and the conventional core 500, and the relationship between the inner and outer oil channels between the conventional core 500 and the conventional core 400, please refer to the relevant description above and will not be repeated here.

[0170] Figure 32 and Figure 33 Another schematic diagram of the stator core provided in the embodiment of the present application is shown in FIG. Figure 32 As shown, the stator core 111 further includes two conventional cores 300, two conventional cores 400, and two conventional cores 500. Along the axial direction of the drive motor 100, one conventional core 400, one conventional core 500, one conventional core 300, the special-shaped core 200a, the special-shaped core 200b, another conventional core 300, another conventional core 500, and another conventional core 400 are arranged in sequence.

[0171] like Figure 33 As shown, the first outer layer flow channel 221a of the special-shaped core 200a is connected to the second outer layer flow channel 320 of a conventional core 300, the third outer layer flow channel 520 of a conventional core 500, and the second outer layer flow channel 420 of a conventional core 400, respectively, to form an oil circuit OC41 on the outer layer of the stator core 111. The first outer layer flow channel 221b of the special-shaped core 200b is connected to the second outer layer flow channel 320 of another conventional core 300, the third outer layer flow channel 520 of another conventional core 500, and the second outer layer flow channel 420 of another conventional core 400, respectively, to form an oil circuit OC51 on the outer layer of the stator core 111. Thus, the cooling oil in the first outer layer flow channel 221b of each special-shaped core 200 is divided into two oil paths OC41 and OC51 of the outer layer of the stator core 111, cooling the outer layers of the two conventional cores 300, two conventional cores 500 and two conventional cores 400 of the stator core 111 respectively. Figure 33The first inner long runner 223a of the special-shaped core 200a is connected to the second inner runner 330 of a conventional core 300, the third inner runner 530 of a conventional core 500, and the second inner runner 430 of a conventional core 400, respectively, to form an oil circuit IC61 in the inner layer of the stator core 111. The first inner short runner 222b of the special-shaped core 200b is connected to the second inner runner 330 of another conventional core 300, the third inner runner 530 of another conventional core 500, and the second inner runner 430 of another conventional core 400, respectively, to form another oil circuit IC71 in the inner layer of the stator core 111. As a result, cooling oil flows along the first outer flow channel 221b of the special-shaped core 200b into the first inner long flow channel 223a of the special-shaped core 200a. The cooling oil flowing into the first inner long flow channel 223a of the special-shaped core 200a is then divided and flows into the two inner oil circuits IC61 and IC71 of the stator core 111, respectively cooling the inner layers of the two conventional cores 300, the two conventional cores 500, and the two conventional cores 400 of the stator core 111. Furthermore, the two conventional cores 300, the two conventional cores 500, and the two conventional cores 400 can each be cooled from both inside and outside, improving the heat dissipation of the stator core 111. Furthermore, the cooling oil in the two inner oil circuits IC61 and IC71 of the stator core 111 can also cool the stator winding 112 of the stator core 111, improving the heat dissipation of the stator winding 112.

[0172] about Figure 32 and Figure 33 For the contents not described in the shown stator core, such as the structure of the conventional core 300, the structure of the conventional core 400, the structure of the conventional core 500, the structure of the special-shaped core 200, the relationship between the inner and outer oil channels between the conventional core 300 and the special-shaped core 200, the relationship between the inner and outer oil channels between the conventional core 300 and the conventional core 500, and the relationship between the inner and outer oil channels between the conventional core 500 and the conventional core 400, please refer to the relevant description above and will not be repeated here.

[0173] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A drive motor, characterized in that: The motor stator of the drive motor includes a stator core and a stator winding, the stator winding is wound around the stator core, the stator core includes two special-shaped cores, the two special-shaped cores are arranged adjacent to each other along the axial direction of the drive motor, each of the special-shaped cores includes multiple groups of flow channels, the multiple groups of flow channels are distributed at intervals along the circumference of the drive motor, each group of flow channels includes a first outer layer flow channel, a first inner layer short flow channel and a first inner layer long flow channel, the first inner layer short flow channel and the first outer layer flow channel in each group of flow channels are distributed on the same side of the first inner layer long flow channel along the circumference of the drive motor, and the first inner layer short flow channel and the first outer layer flow channel in each group of flow channels are distributed at intervals along the radial direction of the drive motor, wherein: The maximum width of the first inner long flow channel in each group of the flow channels along the circumference of the drive motor is greater than the interval between the first inner short flow channel and the first inner long flow channel; In each group of the flow channels, a length of the first inner long flow channel along the radial direction of the drive motor is greater than a distance between the first inner short flow channel and the first outer flow channel.

2. The drive motor according to claim 1, wherein: The two special-shaped iron cores are staggered along the circumference of the drive motor, the first outer layer flow channels in the two special-shaped iron cores are staggered along the circumference of the drive motor, the first inner layer short flow channels in the two special-shaped iron cores are staggered along the circumference of the drive motor, the first inner layer long flow channels in the two special-shaped iron cores are staggered along the circumference of the drive motor, and the first inner layer short flow channels and the first inner layer long flow channels in the two special-shaped iron cores are aligned along the axial direction of the drive motor.

3. The drive motor according to claim 1 or 2, characterized in that: Each of the first outer layer flow channels of one of the special-shaped iron cores is used to partially connect with one of the first inner layer long flow channels of another special-shaped iron core; Each of the first inner layer long flow channels of the other special-shaped iron core is used to partially connect one of the first inner layer short flow channels of the one special-shaped iron core and to partially connect two of the first inner layer long flow channels of two adjacent groups of flow channels.

4. The drive motor according to any one of claims 1 to 3, characterized in that: The width of the stator winding along the circumferential direction of the drive motor is respectively smaller than the minimum width of each of the first inner layer long flow channels and the width of each of the first inner layer short flow channels.

5. The drive motor according to any one of claims 1 to 4, characterized in that: The multiple special-shaped punchings of each special-shaped iron core are arranged in sequence along the axial direction of the drive motor, wherein: The outer circumferential surface of each of the special-shaped punching sheets includes a plurality of grooves, the plurality of grooves are spaced apart along the circumference of the drive motor, the concave direction of each of the grooves is away from the outer circumferential surface of each of the special-shaped punching sheets, and the plurality of grooves of the plurality of special-shaped punching sheets are respectively connected along the axial direction of the drive motor to form the first outer layer flow channels in the plurality of flow channels; The inner circumferential surface of each of the special-shaped punching sheets includes a plurality of short winding slots and a plurality of long winding slots. Each of the short winding slots is arranged adjacent to one of the long winding slots along the circumferential direction of the drive motor. Each of the short winding slots and one of the grooves are arranged spaced apart along the radial direction of the drive motor. The slot depth of each of the long winding slots is greater than the sum of the slot depth of each of the short winding slots and the spacing between the short winding slot and the groove. The maximum slot width of each of the long winding slots along the circumferential direction of the drive motor is greater than or equal to the spacing between the long winding slot and the adjacent short winding slot, wherein: The multiple short winding slots of the multiple special-shaped punching sheets are respectively connected along the axial direction of the drive motor to form the first inner layer long flow channel among the multiple groups of flow channels, and the multiple long winding slots of the multiple special-shaped punching sheets are respectively connected along the axial direction of the drive motor to form the first inner layer short flow channel among the multiple groups of flow channels.

6. The drive motor according to any one of claims 1 to 5, characterized in that: The outer circumferential surface of each of the special-shaped iron cores includes a plurality of oil collecting grooves, and the plurality of oil collecting grooves are arranged at intervals along the circumference of the drive motor, and the concave direction of each of the oil collecting grooves is away from the outer circumferential surface of each of the special-shaped iron cores, wherein: Each of the oil collecting grooves of each of the special-shaped iron cores is used to connect the first outer layer flow channels in the plurality of groups of flow channels.

7. The drive motor according to any one of claims 1 to 6, characterized in that: The stator core further includes a conventional core, and the two special-shaped cores are arranged on the same side of the conventional core along the axial direction of the drive motor, wherein: The conventional iron core comprises a plurality of second outer runners and a plurality of second inner runners, wherein the plurality of second outer runners are spaced apart along the circumference of the drive motor, and the plurality of second inner runners are spaced apart along the circumference of the drive motor; Each of the first outer layer flow channels is used to connect one or more of the second outer layer flow channels, each of the first inner layer short flow channels is used to connect one of the two adjacently arranged second inner layer flow channels, and each of the first inner layer long flow channels is used to connect the other of the two second inner layer flow channels.

8. The driving motor according to claim 7, characterized in that: Each of the special-shaped iron cores includes a plurality of special-shaped punchings, which are arranged in sequence along the axial direction of the drive motor; the conventional iron core includes a plurality of conventional punchings, which are arranged in sequence along the axial direction of the drive motor, wherein: The number of the special-shaped punching sheets in each of the special-shaped iron cores is less than the number of the regular punching sheets in the one regular iron core.

9. The drive motor according to claim 7 or 8, characterized in that: The width of each second inner layer flow channel along the radial direction of the drive motor and along the circumferential direction of the drive motor is a variable value, and the width of the stator winding along the circumferential direction of the drive motor is equal to the minimum width of each second inner layer flow channel.

10. The drive motor according to any one of claims 7 to 9, characterized in that: Each conventional punching sheet of the conventional iron core includes a plurality of oil holes, and the plurality of oil holes are arranged at intervals along the circumference of the drive motor, wherein: The multiple oil holes of the multiple conventional punching sheets of the one conventional iron core are respectively connected along the axial direction of the drive motor to form the multiple second outer layer flow channels.

11. The drive motor according to any one of claims 7 to 9, characterized in that: The outer peripheral surface of each conventional punching sheet of the conventional iron core includes a plurality of grooves, and the plurality of grooves are distributed at intervals along the circumference of the drive motor. The concave direction of each groove is away from the outer peripheral surface of each conventional punching sheet, and the plurality of grooves of the plurality of conventional punching sheets of the conventional iron core are respectively connected along the axial direction of the drive motor to form the plurality of second outer layer flow channels.

12. The drive motor according to any one of claims 7 to 11, characterized in that: The inner circumferential surface of each conventional punching sheet of the conventional iron core includes a plurality of winding slots, the plurality of winding slots are arranged at intervals along the circumferential direction of the drive motor, a slot wall of each winding slot includes a groove, and the recessed direction of the groove in each winding slot is away from the slot wall, wherein: The multiple winding slots of the multiple conventional punching sheets of the conventional iron core and the grooves in the multiple winding slots are respectively connected along the axial direction of the drive motor to form the multiple second inner layer flow channels.

13. The drive motor according to any one of claims 7 to 12, characterized in that: The stator core further includes another conventional core, which is arranged adjacent to the one conventional core along the axial direction of the drive motor, wherein: The outer peripheral surface of the other conventional iron core includes a plurality of oil storage tanks, which are arranged at intervals along the circumference of the drive motor. The recessed direction of each oil storage tank is away from the outer peripheral surface of the other conventional iron core, and each oil storage tank of the other conventional iron core is used to connect multiple second outer layer flow channels.

14. A powertrain, characterized in that: The power assembly includes a reducer and a drive motor according to any one of claims 1 to 13, wherein a motor shaft of the drive motor is used for transmission connection with an input shaft of the reducer.

15. An electric vehicle, characterized in that: The electric vehicle comprises wheels, a transmission mechanism, and the powertrain according to claim 14, wherein the powertrain is configured to drive the wheels via the transmission mechanism.

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