Stator assembly, motor, driving assembly and assembling method of stator assembly

Abstract

The invention discloses a stator assembly, a motor, a driving assembly and an assembling method of the stator assembly, and relates to the technical field of stator heat dissipation, and the stator assembly comprises a stator punching sheet group and a cooling pipe; the stator punching sheet group comprises a plurality of laminated stator punching sheets and is provided with a first through hole and a second through hole; the cooling pipe comprises a first cooling pipe and a second cooling pipe, the first cooling pipe penetrates through the first through hole, the second cooling pipe penetrates through the second through hole, the first cooling pipe and the second cooling pipe are connected to form a connecting part, the connecting part is located in the second through hole, and the cooling pipe further comprises a liquid inlet pipe and a liquid outlet pipe; and the liquid inlet pipe and the liquid outlet pipe are connected with the first cooling pipe and the second cooling pipe to form a communicating liquid path. According to the technical scheme provided by the invention, a complicated structure designed on the end cover can be canceled, and the leakage risk can be effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of stator heat dissipation technology, and in particular to a stator assembly, a motor, a drive assembly, and a method for assembling the stator assembly. Background Technology

[0002] With the increasing performance requirements of permanent magnet synchronous motors, stators with exposed iron cores have been widely used. Compared with the casing design, the exposed iron core design has certain performance advantages: larger electromagnetic coils can increase the motor's power density, better cooling can further reduce temperature rise, and higher radial stiffness can effectively reduce motor noise.

[0003] In related technologies, stator water cooling solutions with exposed iron cores usually require complex structures to be designed on the end caps to install coolant pipes, and there is a high risk of leakage. Summary of the Invention

[0004] The main objective of this invention is to provide an assembly method for a stator assembly, a motor, a drive assembly, and a stator assembly, which aims to eliminate the need for complex structures on the end caps and effectively reduce the risk of leakage.

[0005] To achieve the above objectives, the present invention provides a stator assembly comprising:

[0006] A stator lamination assembly, wherein the stator lamination assembly comprises a plurality of stator laminations stacked together, and is provided with a first through hole and a second through hole;

[0007] The cooling pipe includes a first cooling pipe and a second cooling pipe. The first cooling pipe passes through a first through hole, and the second cooling pipe passes through a second through hole. The first cooling pipe and the second cooling pipe are connected to form a connecting part, which is located inside the second through hole. The cooling pipe also includes an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are connected to the first cooling pipe and the second cooling pipe to form a continuous loop.

[0008] In one embodiment, the stator assembly includes a first perforation and a second perforation of different sizes.

[0009] In one embodiment, the stator assembly includes: the stator lamination group includes a first stator lamination group and a second stator lamination group, the first stator lamination group includes a plurality of stator laminations stacked together and having the first through hole, and the second stator lamination group includes a plurality of stator laminations stacked together and having the second through hole.

[0010] In one embodiment, the stator assembly includes: the end of the first cooling pipe passing through the first perforation extends out of the end face of the first stator lamination assembly and is connected to the second cooling pipe.

[0011] In one embodiment, the first cooling pipe and the second cooling pipe are welded together to form the connection.

[0012] In one embodiment, the inlet pipe and the outlet pipe pass through the first perforation and / or through the second perforation.

[0013] In one embodiment, the inlet pipe is provided with an inlet, and the outlet pipe is provided with an outlet. When the inlet pipe and the outlet pipe pass through the first perforation, the end of the inlet pipe and the outlet pipe away from the inlet is connected to the second cooling pipe. When the inlet pipe and the outlet pipe pass through the second perforation, the end of the inlet pipe and the outlet pipe away from the inlet is connected to the first cooling pipe.

[0014] In one embodiment, the inlet pipe and the outlet pipe are further connected to a cold liquid pipe disposed around the end cap.

[0015] In one embodiment, the first cooling pipe and / or the second cooling pipe are U-shaped pipes, with two straight cooling pipes of the U-shaped pipe passing through the first through hole and / or the second through hole.

[0016] In one embodiment, the first stator lamination group has multiple sets of first through holes, each set having two first through holes. The liquid inlet pipe and the liquid outlet pipe are respectively inserted through the two first through holes of one set of first through holes. The two straight cooling pipes of each set of first cooling pipes are respectively inserted through the two first through holes of the remaining sets of first through holes. The second stator lamination group has multiple sets of second through holes, each set having one second through hole. The two straight cooling pipes of each set of second cooling pipes are inserted through the one second through hole. Or,

[0017] The second stator lamination group has multiple sets of second through holes, each set having two second through holes. The liquid inlet pipe and the liquid outlet pipe respectively pass through the two second through holes of one set of second through holes. The two straight pipe sections of each set of second cooling pipes respectively pass through the two second through holes of the remaining sets of second through holes. The first stator lamination group has multiple sets of first through holes, each set having one first through hole. The two straight pipe sections of each set of first cooling pipes pass through the one first through hole. Or,

[0018] The first stator lamination group has multiple sets of first through holes, each set of first through holes having two first through holes. The liquid inlet pipe and the liquid outlet pipe are respectively inserted through the two first through holes of one set of first through holes. The two straight cooling pipes of each set of first cooling pipes are respectively inserted through the two first through holes of the remaining sets of first through holes. The second stator lamination group has multiple sets of second through holes, one set of second through holes having two second through holes. The liquid inlet pipe and the liquid outlet pipe are inserted through the two second through holes. The remaining sets of second through holes have one second through hole. The two straight cooling pipes of each set of second cooling pipes are inserted through the one second through hole.

[0019] In one embodiment, the inlet pipe and the outlet pipe are respectively connected to an auxiliary inlet pipe and an auxiliary outlet pipe, and the auxiliary inlet pipe and the auxiliary outlet pipe are also connected to a cold liquid pipe arranged around the end cap.

[0020] In one embodiment, the radially outer portion of the first stator lamination group is provided with a first corner and a first side, and the first through hole is provided at the first corner or at the first side. The radially outer portion of the second stator lamination group is provided with a second corner and a second side, and the second through hole is correspondingly provided at the second corner or at the second side.

[0021] In one embodiment, the first stator lamination group is provided with a first air duct hole, and the second stator lamination group is provided with a second air duct hole, the second air duct hole being connected to the first air duct hole.

[0022] In one embodiment, the first air duct hole is disposed between two adjacent first through holes, and the second air duct hole is disposed between two adjacent second through holes.

[0023] In one embodiment, the first air duct hole includes a first sub-air duct hole and a second sub-air duct hole, which are alternately distributed on the radial outer side of the first stator lamination group.

[0024] In one embodiment, the second air duct hole is connected to the second sub-air duct hole.

[0025] In one embodiment, a partition is provided between the first stator lamination group and the second stator lamination group, the partition is provided with a third through hole, the third through hole is connected to the first through hole and the second through hole, and the first cooling pipe is also provided through the third through hole;

[0026] The partition is used to cover the first sub-ventilation hole.

[0027] In one embodiment, the first cooling pipe extends from the end of the first perforation to the end face of the spacer away from the first stator lamination group.

[0028] In one embodiment, a first toothed pressure plate is provided on the side of the first stator lamination group away from the second stator lamination group. The first toothed pressure plate is provided with a fourth through hole, which communicates with the first through hole. The first cooling pipe is also provided through the fourth through hole.

[0029] And / or, the second stator lamination group is provided with a second tooth pressure plate on the side away from the first stator lamination group, the second tooth pressure plate is provided with a fifth through hole, the fifth through hole is connected to the second through hole, and the second cooling pipe is also provided through the fifth through hole.

[0030] In one embodiment, a first end plate is provided on the side of the first stator lamination group away from the second stator lamination group. The first end plate is provided with a sixth through hole, which communicates with the first through hole. The first cooling pipe is also provided through the sixth through hole. The first cooling pipe is welded to the first end plate.

[0031] And / or, the second stator lamination group is further provided with a second end plate on the side away from the first stator lamination group, the second end plate is provided with a seventh through hole, the seventh through hole is connected to the second through hole, and the second cooling pipe is also provided through the seventh through hole; the second cooling pipe is welded to the second end plate.

[0032] In one embodiment, the stator assembly further includes a connector that connects the first stator lamination group and the second stator lamination group.

[0033] In one embodiment, potting compound is used to fill the space between the first cooling pipe and the wall of the first perforation.

[0034] And / or, the space between the second cooling pipe and the wall of the second perforation is filled with potting compound.

[0035] To achieve the objectives of this invention, the present invention also provides an electric motor, comprising: a stator assembly as described in any one of claims 1 to 22; and a rotor, the rotor being disposed within the stator assembly.

[0036] In one embodiment, the motor includes a stator assembly exposed in an installation environment outside the motor.

[0037] To achieve the objectives of this invention, a drive assembly is also proposed, which includes the motor described above.

[0038] To achieve the objectives of this invention, a method for assembling a stator assembly is also proposed, comprising the following steps:

[0039] A plurality of stator laminations are provided, and the stator laminations are stacked to form a stator lamination group, wherein the stator lamination group is provided with a first through hole and a second through hole;

[0040] The first cooling pipe is inserted into the first through hole;

[0041] The first cooling pipe and the second cooling pipe are connected to form a connection part;

[0042] The second cooling pipe is inserted into the second through hole, and the connecting part is located inside the second through hole;

[0043] The inlet pipe and outlet pipe are connected to the first cooling pipe and / or the second cooling pipe, respectively, to form a continuous loop.

[0044] In one embodiment, the assembly method includes the following steps:

[0045] Set up the first stator lamination group;

[0046] The first cooling pipe is passed through the first perforation of the first stator lamination group;

[0047] The first cooling pipe and the second cooling pipe are connected to form a connection part;

[0048] Set up a second stator lamination group;

[0049] The second cooling pipe is passed through the second through hole of the second stator lamination assembly so that the connection portion is located within the second through hole of the second stator lamination assembly.

[0050] In one embodiment, the assembly method further includes: passing the inlet pipe and the outlet pipe through a first through hole in the first stator lamination assembly, and connecting the ends of the inlet pipe and the outlet pipe away from the inlet to the second cooling pipe; or, passing the inlet pipe and the outlet pipe through a second through hole in the second stator lamination assembly, and connecting the ends of the inlet pipe and the outlet pipe away from the inlet to the first cooling pipe, wherein the inlet pipe has an inlet and the outlet pipe has an outlet.

[0051] In one embodiment, before the step of "connecting the first cooling pipe and the second cooling pipe to form a connection portion", the method further includes:

[0052] Spacers are stacked on the side of the first stator lamination group closest to the second stator lamination group.

[0053] In one embodiment, prior to the step of "stabilizing multiple stator laminations to form a first stator lamination group", the method further includes:

[0054] Place the first end plate and / or the first tooth pressure plate;

[0055] After the step of "passing the second cooling pipe through the second through hole of the second stator lamination group so that the connecting portion is located within the second through hole of the second stator lamination group", the method further includes:

[0056] A second tooth pressure plate and / or a second end plate are placed on the side of the second stator lamination group away from the first stator lamination group.

[0057] In one embodiment, after the step of "passing the second cooling pipe through the second through hole of the second stator lamination group so that the connecting portion is located within the second through hole of the second stator lamination group", the method further includes:

[0058] Fill the space between the first cooling pipe and the wall of the first perforation with potting compound;

[0059] And / or, fill the space between the second cooling pipe and the wall of the second perforation with potting compound.

[0060] The technical solution of this invention involves setting a first and a second through hole in the stator lamination assembly, inserting a first cooling pipe through the first through hole in the stator lamination assembly, connecting a second cooling pipe to the first cooling pipe to form a connecting part, inserting the second cooling pipe through the second through hole, and placing the connecting part inside the second through hole. The inlet and outlet pipes are then connected to the first and second cooling pipes to form a continuous circuit. This method allows for the positioning and connection of the first and second cooling pipes during the assembly of the stator lamination assembly, forming an integral cooling pipe within the stator lamination assembly. This eliminates the need for complex structures on the end caps to install the various coolant pipes, and can even eliminate the use of end caps altogether. It also eliminates the need for O-rings between the end caps and the stator laminations, reducing the risk of leakage. Furthermore, since each coolant pipe is built into the stator assembly, it is not visible from the outside of the stator assembly, protecting the cooling pipes and improving reliability. Additionally, the stator assembly does not require complex cooling pipe avoidance structures on its exterior, improving aesthetics and providing good mass production manufacturability. Attached Figure Description

[0061] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0062] Figure 1 An exploded view of an embodiment of the stator assembly provided by the present invention;

[0063] Figure 2A schematic diagram of the structure of the cooling pipe before connection in one embodiment of the stator assembly provided by the present invention;

[0064] Figure 3 A side view of a first stator lamination assembly in one embodiment of the stator assembly provided by the present invention;

[0065] Figure 4 A side view of a second stator lamination assembly in one embodiment of the stator assembly provided by the present invention;

[0066] Figure 5 A schematic diagram of the cooling pipe structure in another embodiment of the stator assembly provided by the present invention;

[0067] Figure 6 A flowchart illustrating the steps of the stator assembly method provided by the present invention.

[0068] Explanation of icon numbers:

[0069]

[0070]

[0071] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0072] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0073] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0074] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0075] With the increasing performance requirements of permanent magnet synchronous motors, stators with exposed iron cores have been widely used. Compared with the casing design, the exposed iron core design has certain performance advantages: larger electromagnetic coils can increase the motor's power density, better cooling can further reduce temperature rise, and higher radial stiffness can effectively reduce motor noise.

[0076] In related technologies, stator water cooling solutions with exposed iron cores usually require complex structures to be designed on the end caps to install coolant pipes, and there is a high risk of leakage.

[0077] To address the aforementioned issues, this invention proposes a stator assembly 100 that eliminates the need for complex structures on the end caps and effectively reduces the risk of leakage. The stator assembly is exposed in the installation environment outside the motor, and no external housing is provided for the stator assembly.

[0078] Please see Figures 1 to 4 In one embodiment of the present invention, the stator assembly 100 includes a stator lamination group 1 and a cooling pipe 30; the stator lamination group 1 includes a plurality of stator laminations stacked on top of each other, and is provided with a first through hole 11 and a second through hole 21; the cooling pipe 30 includes a first cooling pipe 31 and a second cooling pipe 32, the first cooling pipe 31 is inserted through the first through hole 11, the second cooling pipe 32 is inserted through the second through hole 21, the first cooling pipe 31 and the second cooling pipe 32 are connected to form a connecting part 315, the connecting part 315 is located in the second through hole 21, the cooling pipe 30 also includes a liquid inlet pipe 311 and a liquid outlet pipe 312, the liquid inlet pipe 311 and the liquid outlet pipe 312 are connected to the first cooling pipe 31 and the second cooling pipe 32 to form a connecting loop.

[0079] Understandably, the form of coolant is not limited; for example, it can be water, ethylene glycol-water mixture, or any other liquid suitable for motor cooling.

[0080] The technical solution of the present invention is to provide a first through hole and a second through hole in the stator lamination assembly, pass a first cooling pipe through the first through hole in the stator lamination assembly, then connect the second cooling pipe to the first cooling pipe to form a connecting part 315, pass the second cooling pipe through the second through hole, and place the connecting part 315 inside the second through hole, and connect the liquid inlet pipe and the liquid outlet pipe to the first cooling pipe and the second cooling pipe to form a connected circuit. For example, some stator laminations are stacked to form stator lamination group 1, and some stator laminations are stacked to form stator lamination group 2. Then, a first cooling pipe 31 is inserted through a first through hole 11 on stator lamination group 1. Then, a second cooling pipe 32 is connected to the first cooling pipe 31 outside stator lamination group 1 to form a connecting part 315. Then, stator lamination group 2 is fitted over the second cooling pipe 32, with the second cooling pipe 32 and the connecting part 315 located in the second through hole 21. Then, an inlet pipe 311 and an outlet pipe 312 are used to connect to the first cooling pipe 31 and the second cooling pipe 32 to form a continuous circuit. Finally, stator lamination group 1 and stator lamination group 2 are fixed. This method allows for the positioning and connection of the first cooling pipe 31 and the second cooling pipe 32 during the assembly of the stator lamination group 1, forming an integral cooling pipe 30 within the stator lamination group. This eliminates the need for complex structures on the end caps to install the coolant pipes, and also eliminates the use of O-rings between the end caps and the stator laminations, reducing the risk of leakage. Furthermore, it eliminates the need for structures such as end plates on the outside of the stator assembly to avoid the coolant pipes. Since the cooling pipe 30 is located inside the stator assembly, it can be effectively protected, resulting in better reliability, improved aesthetics, and good mass production manufacturability.

[0081] The number of stator laminations in stator lamination group 1 is not specifically limited. The stator laminations in stator lamination group 1 corresponding to the first perforation 11 and the stator laminations in stator lamination group 1 corresponding to the second perforation 21 may have the same or different shapes and sizes.

[0082] The first cooling pipe 31 and the second cooling pipe 32 of the cooling pipe 30 can be connected by welding, insertion, bonding, or other methods, as long as a sealed connection is ensured between the first cooling pipe 31 and the second cooling pipe 32. The first cooling pipe 31 and the second cooling pipe 32 can be stainless steel liquid pipes, or pipes made of other materials such as copper. In some embodiments, when the first cooling pipe 31 and the second cooling pipe 32 are made of stainless steel liquid pipes, the rust resistance of the first cooling pipe 31 and the second cooling pipe 32 is enhanced, extending the service life of the cooling pipe 30.

[0083] In practical applications, the liquid inlet pipe 311 and the liquid outlet pipe 312 can be connected to the first cooling pipe 31 or the second cooling pipe 32.

[0084] Please see Figure 1 , Figure 3 , Figure 4 In one embodiment of the present invention, the first perforation 11 and the second perforation 21 have different sizes. In a specific embodiment, the first perforation 11 accommodates part of the first cooling pipe, for example, a straight section of the first cooling pipe. After the first cooling pipe is connected to the second cooling pipe, the second perforation 21 is fitted onto the second cooling pipe. Therefore, the space of the second perforation 21 needs to accommodate two straight sections of the second cooling pipe, and the size of the second perforation 21 is larger than the size of the first perforation 11.

[0085] Please see Figure 1 , Figure 3 , Figure 4 In one embodiment of the present invention, the stator lamination group 1 includes a first stator lamination group 10 and a second stator lamination group 20. The first stator lamination group 10 includes a plurality of stator laminations stacked together and is provided with a first through hole 11. The second stator lamination group 20 includes a plurality of stator laminations stacked together and is provided with a second through hole 21.

[0086] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the end of the first cooling pipe 31 passes through the first through hole 11, extends out of the end face of the first stator lamination group 10, and is connected to the second cooling pipe 32.

[0087] This configuration, by having the end of the first cooling pipe 31 extend to the end face of the first stator lamination group 10, makes it easier to connect the second cooling pipe 32 to the first cooling pipe 31, avoiding blind connection.

[0088] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the first cooling pipe and the second cooling pipe are welded to form a connection portion 315.

[0089] This configuration, which uses welding to connect the first cooling pipe 31 and the second cooling pipe 32, can effectively improve the reliability of the connection between the first cooling pipe 31 and the second cooling pipe 32.

[0090] In some embodiments, a positioning stop can be provided at the end of the second cooling pipe 32. When the end of the second cooling pipe 32 is inserted into the end of the first cooling pipe 31, the positioning stop can be used to position the insertion position of the first cooling pipe 31 and the second cooling pipe 32. Then, the second cooling pipe 32 can be further fixed to the first cooling pipe 31 by welding. This combination of welding and insertion can improve the connection reliability between the first cooling pipe 31 and the second cooling pipe 32. Alternatively, the positioning stop can also be provided on the first cooling pipe 31.

[0091] In practical applications, the welding methods between the first cooling pipe 31 and the second cooling pipe 32 include, but are not limited to, brazing, argon arc welding, gas shielded welding, etc.

[0092] Please see Figures 1 to 4 In one embodiment of the present invention, the inlet pipe 311 and the outlet pipe 312 are disposed in the first through hole 11 and / or in the second through hole 21.

[0093] With this configuration, by also inserting the liquid inlet pipe 311 and the liquid outlet pipe 312 into the first through hole 11 of the first stator lamination group 10 and / or into the second through hole 21 of the second stator lamination group 20, not only are the first cooling pipe 31 and the second cooling pipe 32 respectively accommodated in the first through hole 11 and the second through hole 21, but the liquid inlet pipe 311 and the liquid outlet pipe 312 are also accommodated in the first through hole 11 and / or the second through hole 21, so that the cooling pipe 30 as a whole is not exposed, further improving the aesthetics of the stator assembly 100 and enhancing the protection of the cooling pipe 30.

[0094] Optionally, the inlet pipe 311 and the outlet pipe 312 are both inserted into the first perforation 11; or, the inlet pipe 311 and the outlet pipe 312 are both inserted into the second perforation 21; or, the inlet pipe 11 and the outlet pipe 12 are partially inserted into the first perforation 11 and partially inserted into the second perforation 21.

[0095] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the liquid inlet pipe 311 is provided with a liquid inlet 3111, and the liquid outlet pipe 312 is provided with a liquid outlet 3121. When the liquid inlet pipe 311 and the liquid outlet pipe 312 pass through the first through hole 11, the side of the liquid inlet pipe 311 and the liquid outlet pipe 312 away from the liquid inlet 3111 is connected to the second cooling pipe 32. When the liquid inlet pipe 311 and the liquid outlet pipe 312 pass through the second through hole 21, the side of the liquid inlet pipe 311 and the liquid outlet pipe 312 away from the liquid inlet 3121 is connected to the first cooling pipe 311.

[0096] With this configuration, when the inlet pipe 311 and the outlet pipe 312 pass through the first through hole 11, the side of the inlet pipe 311 and the outlet pipe 312 away from the inlet port 3111 can be connected to the second cooling pipe 32. In this way, after the coolant enters the inlet pipe 311 from the inlet port 3111, it enters the second cooling pipe 32 from the inlet pipe 311, then flows in the second cooling pipe 32 and the first cooling pipe 31, and then enters the outlet pipe 312 from the second cooling pipe 32. Finally, it flows outward from the outlet port 3121 of the outlet pipe 312 and is discharged outward. With the flow of coolant, the stator assembly 100 is cooled and dissipated.

[0097] When the inlet pipe 311 and the outlet pipe 312 are inserted through the second through hole 21, the side of the inlet pipe 311 and the outlet pipe 312 away from the inlet port 3121 can be connected to the first cooling pipe 311. In this way, after the coolant enters the inlet pipe 311 from the inlet port 3111, it enters the first cooling pipe 311 from the inlet pipe 311, then flows in the first cooling pipe 31 and the second cooling pipe 32, and then enters the outlet pipe 312 from the first cooling pipe 31. Finally, it flows outward from the outlet port 3121 of the outlet pipe 312 and is discharged outward. With the flow of coolant, the stator assembly 100 is cooled and dissipated.

[0098] In one specific embodiment, the inlet pipe 311 and the outlet pipe 312 are connected to an external water inlet / outlet structure. They can also be connected to cooling pipes inside the end cover, forming a continuous loop with the cooling pipe structure of the stator assembly, thereby dissipating heat from the motor. Understandably, the inlet and outlet pipes can be connected to the cooling pipe structure of the end cover on one side, or they can be connected to the cooling pipe structure of the end cover on both sides respectively.

[0099] Please see Figure 1 , Figure 2 In one embodiment of the present invention, the first cooling pipe 31 and / or the second cooling pipe 32 are U-shaped pipes, and the two straight cooling pipes of the U-shaped pipe are inserted through the first through hole 11 and / or the second through hole 21.

[0100] With this configuration, during the assembly process, it is easier to assemble the first cooling pipe 31 by passing the two straight cooling pipes of the first cooling pipe 31 through the first through hole 11, and it is also easier to assemble the second cooling pipe 32 by passing the two straight cooling pipes of the second cooling pipe 32 through the second through hole 21.

[0101] Please see Figures 1 to 4 In one embodiment of the present invention, the first stator lamination group 10 is provided with multiple sets of first through holes, each set of first through holes having two first through holes 11, the liquid inlet pipe 311 and the liquid outlet pipe 312 respectively passing through the two first through holes 11 of one set of first through holes, and the two straight cooling pipes of each set of first cooling pipes 31 respectively passing through the two first through holes 11 of the other sets of first through holes; the second stator lamination group 20 is provided with multiple sets of second through holes, each set of second through holes having one second through hole 21, and the two straight cooling pipes of each set of second cooling pipes 32 passing through one second through hole 21.

[0102] With this configuration, the liquid inlet pipe 311, the liquid outlet pipe 312, and the two straight cooling pipes of the first cooling pipe 31 can be passed through the first through hole 11 corresponding to the first stator lamination group 10, and the two straight cooling pipes of the second cooling pipe 32 can be passed through the second through hole 21 corresponding to the second stator lamination group 20, so as to facilitate the assembly of the liquid inlet pipe 311, the liquid outlet pipe 312, the first cooling pipe 31, and the second cooling pipe 32 with the stator lamination group 1.

[0103] Alternatively, in another embodiment of the present invention, the second stator lamination group 20 is provided with multiple sets of second through holes, each set of second through holes having two second through holes 21, the liquid inlet pipe 311 and the liquid outlet pipe 312 respectively passing through the two second through holes 21 of one set of second through holes, and the two straight pipe sections of each set of second cooling pipes 32 respectively passing through the two second through holes 21 of the remaining sets of second through holes; the first stator lamination group 10 is provided with multiple sets of first through holes, each set of first through holes having one first through hole 11, and the two straight pipe sections of each set of first cooling pipes 31 passing through one first through hole 11.

[0104] With this configuration, the two straight cooling pipes of the inlet pipe 311, the outlet pipe 312, and the second cooling pipe 32 can be passed through the second through hole 12 corresponding to the second stator lamination group 20, and the two straight cooling pipes of the first cooling pipe 31 can be passed through the first through hole 11 corresponding to the first stator lamination group 10. This also facilitates the assembly of the inlet pipe 311, the outlet pipe 312, the first cooling pipe 31, and the second cooling pipe 32 with the stator lamination group 1.

[0105] Or, please see Figure 5 In another embodiment of the present invention, the first stator lamination group 10 is provided with multiple sets of first through holes, each set of first through holes having two first through holes 11. The liquid inlet pipe 311 and the liquid outlet pipe 312 are respectively inserted through the two first through holes 11 of one set of first through holes, and the two straight cooling pipes of each set of first cooling pipes 31 are respectively inserted through the two first through holes 11 of the remaining sets of first through holes; the second stator lamination group 20 is provided with multiple sets of second through holes, one set of second through holes having two second through holes 21. A second connecting pipe 314 and a first connecting pipe 313 are inserted through the two second through holes 21. The second connecting pipe 314 is connected to the auxiliary liquid inlet pipe 34, and the first connecting pipe 313 is connected to the auxiliary liquid outlet pipe 33. The remaining sets of second through holes have one second through hole 21, and the two straight cooling pipes of each set of second cooling pipes 32 are inserted through one second through hole 21.

[0106] With this configuration, the liquid inlet pipe 311, the liquid outlet pipe 312, and the two straight cooling pipes of the first cooling pipe 31 can be passed through the second through hole 11 corresponding to the first stator lamination group 10, and the two straight cooling pipes of the second cooling pipe 32, the second connecting pipe 314, and the first connecting pipe 313 can be passed through the second through hole 21 corresponding to the second stator lamination group 20. This also facilitates the assembly of the liquid inlet pipe 311, the liquid outlet pipe 312, the first cooling pipe 31, the second cooling pipe 32, the second connecting pipe 314, and the first connecting pipe 313 with the stator lamination group 1.

[0107] Please see Figure 5 In one embodiment of the present invention, the auxiliary liquid inlet pipe 34 and the auxiliary liquid outlet pipe 33 are further connected to a cold liquid pipe 35 arranged around the end cap.

[0108] With this configuration, the coolant enters the inlet pipe 311 from the inlet port 3111, then enters the first connecting pipe 313, and then the auxiliary outlet pipe 33. It then flows through the cold liquid pipe 35 surrounding the end cover, allowing the coolant flowing through the cold liquid pipe 35 to dissipate heat from the bearing in the end cover. The coolant then enters the auxiliary inlet pipe 34 from the cold liquid pipe 35, and then enters the first cooling pipe 31 and the second cooling pipe 32 from the auxiliary outlet pipe 34. Finally, it is discharged outward from the outlet port 3121 of the outlet pipe 312. With the continuous flow of coolant, the stator assembly 100 and the bearing are cooled and dissipated.

[0109] The embodiments of the present invention do not limit the various combinations of inlet pipes and outlet pipes. There can be multiple sets of inlet pipes and multiple sets of outlet pipes. The number of first cooling pipes and second cooling pipes is also not limited, as long as the coolant can circulate within the stator assembly.

[0110] The second connecting pipe 314 and the first connecting pipe 313 are also connected to the first cooling pipe 31 by welding to form a connecting part 315, which is also located in the second through hole of the second stator lamination assembly. In a modified embodiment, if the first cooling pipe 31 is longer, the second connecting pipe 314 and the first connecting pipe 313 may not be provided, and the first cooling pipe 31 may be directly connected to the auxiliary liquid outlet pipe 34 and the auxiliary liquid inlet pipe 33.

[0111] Please see Figure 5 In one embodiment of the present invention, the radial outer side of the first stator lamination group 10 is provided with a first corner and a first side, and the first through hole 11 is provided at the first corner or at the first side. The radial outer side of the second stator lamination group 20 is provided with a second corner and a second side, and the second through hole 21 is correspondingly provided at the second corner or at the second side.

[0112] With this configuration, by placing the first through hole 11 at the first corner or the first side of the first stator lamination group 10, it is easier to process the first through hole 11 on the first stator lamination group 10. Similarly, by placing the second through hole 21 at the second corner or the second side of the second stator lamination group 20, it is also easier to process the second through hole 21 on the second stator lamination group 20.

[0113] Please see Figure 1 , Figure 3 , Figure 4 In one embodiment of the present invention, the first stator lamination group 10 is provided with a first air duct hole 12, and the second stator lamination group 20 is provided with a second air duct hole 22, the second air duct hole 22 being connected to the first air duct hole 12.

[0114] This configuration allows the stator assembly 100 to be compatible with both water cooling and air cooling, thereby further improving the cooling and heat dissipation effect of the stator assembly 100. Therefore, the motor using this stator assembly 100 can also be compatible with both water cooling and air cooling.

[0115] In practical applications, the air intake and exhaust methods of the first air duct hole 12 and the second air duct hole 22 are not specifically limited, as long as cooling air can flow into the first air duct hole 12 and the second air duct hole 22 and the cooled air after absorbing heat can flow out of the first air duct hole 12 and the second air duct hole 22.

[0116] In one embodiment, a plurality of stator laminations in the first stator lamination group 10 can be stacked sequentially along the first direction a, and a plurality of stator laminations in the second stator lamination group 20 can also be stacked sequentially along the first direction a. A first through hole 11 is disposed in the first stator lamination group 10 along the first direction a, a second through hole 21 is disposed in the second stator lamination group 20 along the first direction a, and a first air duct hole 12 and a second air duct hole 22 also extend along the first direction a, which makes it easier to assemble the cooling pipe 30.

[0117] Please see Figure 1 , Figure 3 , Figure 4 In one embodiment of the present invention, the first air duct hole 12 is disposed between two adjacent first through holes 11, and the second air duct hole 22 is disposed between two adjacent second through holes 21.

[0118] This configuration allows air cooling and water cooling to be alternately distributed on the stator assembly 100, which can improve the heat dissipation effect of the stator assembly 100.

[0119] Please see Figure 1 , Figure 3 , Figure 4In one embodiment of the present invention, the first air duct hole 12 includes a first sub-air duct hole 121 and a second sub-air duct hole 122, which are alternately distributed on the radial outer side of the first stator lamination group 10.

[0120] With this configuration, more first air duct holes 12 can be provided on the first stator lamination group 10 to extend the path of airflow through the first air duct holes 12, thereby further improving the heat dissipation effect on the stator assembly 100.

[0121] Please see Figure 1 , Figure 3 , Figure 4 In one embodiment of the present invention, the second air duct hole 22 is connected to the second sub-air duct hole 122.

[0122] With this configuration, by connecting the second air duct hole 22 with the second sub-air duct hole 122 of the first air duct hole 12, airflow can flow from the second sub-air duct hole 122 to the second air duct hole 22, so that the airflow can fully flow through the first stator lamination group 10 and the second stator lamination group 20, thereby improving the air cooling effect on the stator assembly 100 and further improving the heat dissipation effect on the stator assembly 100.

[0123] In one embodiment, at least two first perforations 11 can be respectively disposed on both sides of the first sub-air duct, which can make full use of the space at the corner of the first stator lamination group 10 to improve space utilization and increase the heat dissipation area of ​​the stator assembly 100 to improve the heat dissipation effect of the stator assembly 100. In addition, the second perforation 21 can be arranged in an arc shape along the circumference of the second stator lamination group 20, which makes it easier to install the second cooling pipe 32 and avoid interference between the second cooling pipe 32 and the second stator lamination group 20 during the installation process.

[0124] In some embodiments, the stator laminations of the first stator lamination group 10 and the stator laminations of the second stator lamination group 20 differ only in the shape of the first through hole 11 and the second through hole 21, as well as the shape of the first air duct hole 12 and the second air duct hole 22. Based on the stator laminations of the first stator lamination group 10, a hole can be punched between the two first through holes 11 located at the same corner to form a second through hole 21 extending in an arc shape, thereby obtaining stator laminations for stacking the second stator lamination group 20.

[0125] Please see Figure 1 In one embodiment of the present invention, a partition 40 is provided between the first stator lamination group 10 and the second stator lamination group 20. The partition 40 is provided with a third through hole 41, which communicates with the first through hole 11 and the second through hole 21. The first cooling pipe 31 is also provided through the third through hole 41. The partition 40 is used to cover the first sub-air duct hole 121.

[0126] This configuration, by placing a spacer 40 between the first stator lamination group 10 and the second stator lamination group 20 to cover the first sub-air duct hole 121, prevents the potting compound from flowing into and blocking the first sub-air duct hole 121 when filling the second through hole 21. Furthermore, by providing a third through hole 41 on the spacer 40, the first cooling pipe 31 can pass through the first through hole 11 and the third through hole 41 sequentially, allowing the second cooling pipe 32 to connect smoothly to the first cooling pipe 31.

[0127] Please see Figure 1 In one embodiment of the present invention, the first cooling pipe 31 extends through the end of the first through hole 11 to the end face of the partition 40 away from the first stator lamination group 10.

[0128] With this configuration, by extending the end of the first cooling pipe 31 to the end face of the spacer 40 away from the first stator lamination group 10, it is easier to connect the second cooling pipe 32 to the first cooling pipe 31, avoiding blind connection.

[0129] Please see Figure 1 In one embodiment of the present invention, a first tooth pressure plate 50 is provided on the side of the first stator lamination group 10 away from the second stator lamination group 20. The first tooth pressure plate 50 is provided with a fourth through hole 51, which is connected to the first through hole 11. The first cooling pipe 31 is also provided through the fourth through hole 51.

[0130] And / or, the second stator lamination group 20 is provided with a second tooth pressure plate 60 on the side away from the first stator lamination group 10, the second tooth pressure plate 60 is provided with a fifth through hole 61, the fifth through hole 61 is connected to the second through hole 21, and the second cooling pipe 32 is also provided through the fifth through hole 61.

[0131] With this configuration, the first tooth pressure plate 50 can press firmly against the first stator lamination group 10 to compress the teeth of the first stator lamination group 10, thereby preventing the teeth of the first stator lamination group 10 from springing open. Similarly, the second tooth pressure plate 60 can press firmly against the second stator lamination group 20 to compress the teeth of the second stator lamination group 20, thereby preventing the teeth of the second stator lamination group 20 from springing open.

[0132] Please see Figure 1 In one embodiment of the present invention, a first end plate 70 is provided on the side of the first stator lamination group 10 away from the second stator lamination group 20. The first end plate 70 is provided with a sixth through hole 71, which communicates with the first through hole 11. A first cooling pipe 31 is also provided through the sixth through hole 71. The first cooling pipe 31 is welded to the first end plate 70.

[0133] And / or, the second stator lamination group 20 is provided with a second end plate 80 on the side away from the first stator lamination group 10. The second end plate 80 is provided with a seventh through hole 81, which is connected to the second through hole 21. The second cooling pipe 32 is also provided through the seventh through hole 81. The second cooling pipe 32 is welded to the second end plate 80.

[0134] With this configuration, the first end plate 70 and the second end plate 80 can press and fix the first stator lamination group 10 and the second stator lamination group 20, thereby improving the assembly reliability of the first stator lamination group 10 and the second stator lamination group 20.

[0135] Please see Figure 1 In one embodiment of the present invention, the stator assembly 100 further includes a connector 90, which connects the first stator lamination group 10 and the second stator lamination group 20.

[0136] This configuration, using connector 90 to connect the first stator lamination group 10 and the second stator lamination group 20, improves the reliability of the connection between them.

[0137] In practical applications, the connector 90 can be a connecting rod (such as a steel rod, copper rod, etc.), or a screw, adhesive, or other structural component, as long as it can achieve the connection between the first stator lamination group 10 and the second stator lamination group 20.

[0138] Please see Figure 1 , Figure 3 In some embodiments, a spacer 40 is provided between the first stator lamination group 10 and the second stator lamination group 20. A first tooth pressure plate 50 and a first end plate 70 are sequentially provided on the side of the first stator lamination group 10 away from the second stator lamination group 20. A second tooth pressure plate 60 and a second end plate 80 are sequentially provided on the side of the second stator lamination group 20 away from the first stator lamination group 10, so that the first end plate 70, the first tooth pressure plate 50, the first stator lamination group 10, the spacer 40, the second stator lamination group 20, the second tooth pressure plate 60, and the second end plate 80 are combined into an assembly. The first end plate 70, the first tooth pressure plate 50, the first stator lamination group 10, the spacer 40, the second stator lamination group 20, the second tooth pressure plate 60, and the second end plate 80 are all provided with through holes 110 at their corners. After the above components are pre-pressed, steel rods are inserted into the through holes 110, and the steel rods are welded and fixed to the above components under a preset holding pressure, so that the above components can be fixed by steel rods.

[0139] Please see Figure 1 In one embodiment of the present invention, potting compound is filled between the first cooling pipe 31 and the wall of the first perforation 11; and / or, potting compound is filled between the second cooling pipe 32 and the wall of the second perforation 21.

[0140] With this configuration, after the tubes are inserted, potting compound is filled between the first cooling tube 31 and the wall of the first perforation 11, and between the second cooling tube 32 and the wall of the second perforation 21. The gap between the cooling tubes and the perforation walls is filled with potting compound, which can improve the heat exchange efficiency and enhance the cooling effect on the stator assembly 100.

[0141] The present invention also proposes an electric motor, which includes a stator assembly 100 and a rotor. The specific structure of the stator assembly 100 is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The rotor passes through the stator assembly 100.

[0142] In one embodiment of the present invention, the stator assembly 100 is exposed in the installation environment outside the motor. That is, the motor has an exposed stator core structure, i.e., the stator assembly 100 has no outer casing design, which makes water and air cooling methods inside the stator assembly 100 suitable for effective heat dissipation of the motor without an outer casing.

[0143] The present invention also proposes a drive assembly, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since the drive assembly adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0144] Please see Figure 6 The present invention also proposes an assembly method for a stator assembly 100. The specific structure of the stator assembly 100 is as described in the above embodiments. Since the assembly method of the stator assembly 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0145] The assembly method of the stator assembly 100 includes the following steps:

[0146] A plurality of stator laminations are provided, and the stator laminations are stacked to form a stator lamination group, wherein the stator lamination group is provided with a first through hole and a second through hole;

[0147] The first cooling pipe is inserted into the first through hole;

[0148] The first cooling pipe and the second cooling pipe are connected to form a connection part 315;

[0149] The second cooling pipe is inserted into the second through hole, and the connecting part 315 is located inside the second through hole;

[0150] The inlet pipe and outlet pipe are connected to the first cooling pipe and / or the second cooling pipe, respectively, to form a continuous loop.

[0151] In one specific embodiment, the assembly method of the stator assembly 100 includes the following steps:

[0152] S20. Set up a first stator lamination group 10, for example, by stacking multiple stator laminations to form a first stator lamination group 10;

[0153] S30. Pass the first cooling pipe 31 through the first through hole 11 of the first stator lamination group 10;

[0154] S60. Connect the second cooling pipe 32 to the first cooling pipe 31 so that the first cooling pipe 31 and the second cooling pipe 32 are connected to form a connection part 315.

[0155] S70. A second stator lamination group 20 is provided, for example, by stacking multiple stator laminations on the side of the first stator lamination group 10 near the second cooling pipe 32 to form a second stator lamination group 20, and by allowing the second cooling pipe 32 and the connecting portion 315 to pass through the second through hole 21 of the second stator lamination group 20.

[0156] With this configuration, during assembly, multiple stator laminations are first stacked to form a first stator lamination group 10. Then, a first cooling pipe 31 is inserted into the first through hole 11 of the first stator lamination group 10. Next, a second cooling pipe 32 is connected to the first cooling pipe 31 to form a connecting part 315. After the connection is completed, multiple stator laminations are stacked on the side of the first stator lamination group 10 near the second cooling pipe 32 to form a second stator lamination group 20, so that the second cooling pipe 32 is inserted into the second through hole 21 of the second stator lamination group 20. This method can complete the positioning and connection of the first cooling pipe 31 and the second cooling pipe 32 in the lamination process of the first stator lamination group 10 and the second stator lamination group 20, so as to form an integral cooling pipe 30 within the first stator lamination group 10 and the second stator lamination group 20.

[0157] Understandably, the first stator lamination group 10 and the second stator lamination group can be configured in the following ways: multiple stator laminations can be directly stacked on-site. For example, multiple stator laminations can be stacked to form the first stator lamination group 10, and then the first cooling pipe and the second cooling pipe can be threaded through and connected to form the connecting part 315 before stacking multiple stator laminations to form the second stator lamination group. Alternatively, multiple stator laminations can be stacked separately to form the first stator lamination group 10 and the second stator lamination group 20, and then the first cooling pipe and the second cooling pipe can be threaded through and welded.

[0158] Please see Figure 6In one embodiment of the present invention, before the step of "setting a second stator lamination group 20, for example, stacking multiple stator laminations on the side of the first stator lamination group 10 near the second cooling pipe 32 to form the second stator lamination group 20", the method further includes:

[0159] S40. Pass the liquid inlet pipe 311 and the liquid outlet pipe 312 through the first through hole 11 of the first stator lamination group 10, and connect the side of the liquid inlet pipe 311 and the liquid outlet pipe 312 away from the liquid inlet 3111 to the second cooling pipe 32.

[0160] Alternatively, the side of the inlet pipe 311 and the outlet pipe 312 away from the inlet 3111 can be connected to the first cooling pipe 31, so that the inlet pipe 31 and the outlet pipe 32 pass through the second perforation 21 of the second stator lamination group 20.

[0161] With this configuration, when the inlet pipe 311 and the outlet pipe 312 pass through the first through hole 11, the side of the inlet pipe 311 and the outlet pipe 312 away from the inlet port 3111 can be connected to the second cooling pipe 32. In this way, after the coolant enters the inlet pipe 311 from the inlet port 3111, it enters the second cooling pipe 32 from the inlet pipe 311, then flows in the second cooling pipe 32 and the first cooling pipe 31, and then enters the outlet pipe 312 from the second cooling pipe 32. Finally, it flows outward from the outlet port 3121 of the outlet pipe 312 and is discharged outward. With the continuous flow of coolant, the stator assembly 100 is cooled and dissipated.

[0162] When the inlet pipe 311 and the outlet pipe 312 are inserted through the second through hole 21, the side of the inlet pipe 311 and the outlet pipe 312 away from the inlet port 3121 can be connected to the first cooling pipe 311. In this way, after the coolant enters the inlet pipe 311 from the inlet port 3111, it enters the first cooling pipe 311 from the inlet pipe 311, then flows in the first cooling pipe 31 and the second cooling pipe 32, and then enters the outlet pipe 312 from the first cooling pipe 31. Finally, it flows outward from the outlet port 3121 of the outlet pipe 312 and is discharged outward. With the continuous flow of coolant, the stator assembly 100 is cooled and dissipated.

[0163] Please see Figure 6 In one embodiment of the present invention, before the step of "connecting the second cooling pipe 32 to the first cooling pipe 31", the method further includes:

[0164] S50, stack spacers 40 on the first stator lamination group 10.

[0165] This configuration, by placing a spacer 40 between the first stator lamination group 10 and the second stator lamination group 20 to cover the first sub-air duct hole 121, prevents the potting compound from flowing into and blocking the first sub-air duct hole 121 when filling the second through hole 21. Furthermore, by providing a third through hole 41 on the spacer 40, the first cooling pipe 31 can pass through the first through hole 11 and the third through hole 41 sequentially, allowing the second cooling pipe 32 to connect smoothly to the first cooling pipe 31.

[0166] Please see Figure 6 In one embodiment of the present invention, before the step of "setting the first stator lamination group 10, for example, stacking multiple stator laminations to form the first stator lamination group 10", the method further includes:

[0167] S10, Place the first end plate 70 and / or the first tooth pressure plate 50.

[0168] After the step of “setting up a second stator lamination group 20, for example, stacking multiple stator laminations on the side of the first stator lamination group 10 near the second cooling pipe 32 to form a second stator lamination group 20, and allowing the second cooling pipe 32 to pass through the second through hole 21 of the second stator lamination group 20”, the method further includes:

[0169] S80, a second tooth pressure plate 60 and / or a second end plate 80 are placed on the side of the second stator lamination group 20 away from the first stator lamination group 10.

[0170] With this configuration, the first tooth pressure plate 50 can press firmly onto the first stator lamination group 10 to compress the teeth of the first stator lamination group 10, thereby preventing the teeth of the first stator lamination group 10 from springing out. Similarly, the second tooth pressure plate 60 can press firmly onto the second stator lamination group 20 to compress the teeth of the second stator lamination group 20, thereby preventing the teeth of the second stator lamination group 20 from springing out. In addition, the first end plate 70 and the second end plate 80 can press and fix the first stator lamination group 10 and the second stator lamination group 20, thereby improving the assembly reliability of the first stator lamination group 10 and the second stator lamination group 20.

[0171] Please see Figure 6 In one embodiment of the present invention, after the step of "setting a second stator lamination group 20, for example, stacking multiple stator laminations on the side of the first stator lamination group 10 near the second cooling pipe 32 to form a second stator lamination group 20, and allowing the second cooling pipe 32 to pass through the second through hole 21 of the second stator lamination group 20", the method further includes:

[0172] S90. Fill the space between the first cooling pipe 31 and the hole wall of the first perforation 11 with potting compound;

[0173] And / or, fill the space between the second cooling pipe 32 and the hole wall of the second perforation 32 with potting compound.

[0174] This configuration, by filling the gap between the cooling pipe 31 and the hole wall of the first perforation 11 with potting compound, and filling the gap between the cooling pipe 32 and the hole wall of the second perforation 21 with potting compound, can improve heat exchange efficiency and enhance the cooling effect on the stator assembly 100.

[0175] In some embodiments, the specific assembly process of the stator assembly 100 proposed in this invention is as follows:

[0176] First, place the first end plate 70 and the first tooth pressure plate 50 in sequence;

[0177] Second, stator laminations are stacked on the first toothed plate 50. After stacking to a preset height, the above stator laminations can be combined to form the first stator lamination group 10.

[0178] Third, the liquid inlet pipe 311, liquid outlet pipe 312 and the first cooling pipe 31 are respectively inserted into the first through holes 11 of the first stator lamination group 10. The liquid inlet pipe 311, liquid outlet pipe 312 and the first cooling pipe 31 can be axially positioned by the bottom tooling support.

[0179] Fourth, spacers 40 are stacked on the first stator lamination group 10 to complete the preparation of the first cooling pipe 31 before welding. At this time, the ends of the liquid inlet pipe 311, the liquid outlet pipe 312 and the first cooling pipe 31 are all higher than the spacers 40 and away from the end face of the first stator lamination group 10.

[0180] Fifth, an end cap is provided on the second cooling pipe 32. After fitting a brazing ring, the ends of multiple second cooling pipes 32 are respectively inserted into the openings of the corresponding first cooling pipe 31, inlet pipe, and outlet pipe. Then, a special coil is used to sequentially perform induction brazing to complete the welding and fixing. During the process, the airtightness of the cooling pipes needs to be tested. In another embodiment, an end cap can also be provided on the first cooling pipe 31, inlet pipe, and outlet pipe. After fitting a brazing ring, the ends of multiple first cooling pipes 32, inlet pipe, and outlet pipe are respectively inserted into the openings of the corresponding second cooling pipes. Understandably, this embodiment does not limit the specific arrangement method.

[0181] Sixth, after the cooling pipe welding is completed, the stator laminations are stacked on the side of the spacer 40 away from the first stator lamination group 10. After stacking to a preset height, the above multiple stator laminations can be combined to form the second stator lamination group 20.

[0182] Seventh, the second tooth pressure plate 60 and the second end plate 80 are stacked sequentially on the side of the second stator lamination group 20 away from the spacer 40, so that the first end plate 70, the first tooth pressure plate 50, the first stator lamination group 10, the spacer 40, the second stator lamination group 20, the second tooth pressure plate 60, and the second end plate 80 are combined into an assembly.

[0183] Eighth, pre-press the above-mentioned components, then insert four steel rods into the through holes at the four corners of the above-mentioned components respectively, and weld and fix the steel rods to the above-mentioned components under the preset holding pressure, so that the above-mentioned components can be fixed by steel rods; in another embodiment, the step of connecting steel rods can also be done first, as long as the connection and fixation can be achieved.

[0184] Ninth, a bevel is provided at the through hole on the first end plate 70 to fill the bevel with solder, so that the inlet pipe 311 and outlet pipe 312 are welded and sealed with the first end plate 70, and finally an airtightness test is performed. If there are also inlet and outlet pipes at the second end plate 80, a bevel is also required at the through hole on the first end plate 80 to fill the bevel with solder, so that the inlet and outlet pipes are welded and sealed with the first end plate 80.

[0185] Tenth, fill the gap between the wall of the sixth perforation 71 of the first end plate 70 and the inlet pipe 311 with potting compound, so that the potting compound flows into the gap between the wall of the fourth perforation 51 of the first toothed pressure plate 50 and the inlet pipe 311, then into the gap between the wall of the first perforation 11 of the first stator lamination assembly 10 and the inlet pipe 311, and then into the gap between the wall of the third perforation 41 of the spacer 40 and the inlet pipe 311; and fill the gap between the wall of the sixth perforation 71 of the first end plate 70 and the outlet pipe 312 with potting compound, so that the potting compound flows into the gap between the wall of the fourth perforation 51 of the first toothed pressure plate 50 and the outlet pipe 312. Then it flows into the gap between the wall of the first perforation 11 of the first stator lamination group 10 and the outlet pipe 312, and then into the gap between the wall of the third perforation 41 of the partition 40 and the outlet pipe 312; and fills the gap between the wall of the sixth perforation 71 of the first end plate 70 and the first cooling pipe with potting compound, so that the potting compound flows into the gap between the wall of the fourth perforation 51 of the first tooth pressure plate 50 and the first cooling pipe 31, the gap between the wall of the first perforation 11 of the first stator lamination group 10 and the first cooling pipe 31, and then into the gap between the wall of the third perforation 41 of the partition 40 and the first cooling pipe 31, so as to complete the filling of the gap;

[0186] Eleventh, fill the gap between the wall of the seventh through hole 81 of the second end plate 80 and the second cooling pipe 32 with potting compound, so that the potting compound flows into the gap between the wall of the fifth through hole 61 of the second tooth pressure plate 60 and the second cooling pipe 32, and then flows into the gap between the wall of the second through hole 21 of the second stator lamination group 20 and the second cooling pipe 32 to complete the gap filling; wherein, steps ten and eleventh can be interchanged.

[0187] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, include: A stator lamination assembly, wherein the stator lamination assembly comprises a plurality of stator laminations stacked together, and is provided with a first through hole and a second through hole; The cooling pipe includes a first cooling pipe and a second cooling pipe. The first cooling pipe passes through a first through hole, and the second cooling pipe passes through a second through hole. The first cooling pipe and the second cooling pipe are connected to form a connecting part, which is located inside the second through hole. The cooling pipe also includes an inlet pipe and an outlet pipe. The inlet pipe and the outlet pipe are connected to the first cooling pipe and the second cooling pipe to form a continuous loop.

2. The stator assembly as claimed in claim 1, characterized in that, include: The first perforation and the second perforation are different in size.

3. The stator assembly as claimed in claim 1, characterized in that, include: The stator lamination group includes a first stator lamination group and a second stator lamination group. The first stator lamination group includes a plurality of stator laminations stacked together and is provided with the first through hole. The second stator lamination group includes a plurality of stator laminations stacked together and is provided with the second through hole.

4. The stator assembly as claimed in claim 3, characterized in that, include: The first cooling pipe passes through the end of the first perforation, extends out of the end face of the first stator lamination assembly, and connects to the second cooling pipe.

5. The stator assembly as claimed in claim 4, characterized in that, The first cooling pipe and the second cooling pipe are welded together to form the connection.

6. The stator assembly as claimed in claim 3, characterized in that, The inlet pipe and the outlet pipe are inserted through the first perforation and / or through the second perforation.

7. The stator assembly as claimed in claim 6, characterized in that, The inlet pipe is provided with an inlet, and the outlet pipe is provided with an outlet. When the inlet pipe and the outlet pipe pass through the first perforation, the end of the inlet pipe and the outlet pipe away from the inlet is connected to the second cooling pipe. When the inlet pipe and the outlet pipe pass through the second perforation, the end of the inlet pipe and the outlet pipe away from the inlet is connected to the first cooling pipe.

8. The stator assembly as claimed in claim 1, characterized in that, The inlet pipe and the outlet pipe are also connected to a cold liquid pipe arranged around the end cap.

9. The stator assembly as claimed in claim 3, characterized in that, The first cooling pipe and / or the second cooling pipe are U-shaped pipes, and the two straight cooling pipes of the U-shaped pipe are inserted through the first through hole and / or the second through hole.

10. The stator assembly as claimed in claim 9, characterized in that, The first stator lamination group has multiple sets of first through holes, each set having two first through holes. The liquid inlet pipe and the liquid outlet pipe are respectively inserted through the two first through holes of one set of first through holes. The two straight cooling pipes of each set of first cooling pipes are respectively inserted through the two first through holes of the remaining sets of first through holes. The second stator lamination group has multiple sets of second through holes, each set having one second through hole. The two straight cooling pipes of each set of second cooling pipes are inserted through the one second through hole. Or, The second stator lamination group has multiple sets of second through holes, each set having two second through holes. The liquid inlet pipe and the liquid outlet pipe respectively pass through the two second through holes of one set of second through holes. The two straight pipe sections of each set of second cooling pipes respectively pass through the two second through holes of the remaining sets of second through holes. The first stator lamination group has multiple sets of first through holes, each set having one first through hole. The two straight pipe sections of each set of first cooling pipes pass through the one first through hole. Or, The first stator lamination group has multiple sets of first through holes, each set of first through holes having two first through holes. The liquid inlet pipe and the liquid outlet pipe are respectively inserted through the two first through holes of one set of first through holes. The two straight cooling pipes of each set of first cooling pipes are respectively inserted through the two first through holes of the remaining sets of first through holes. The second stator lamination group has multiple sets of second through holes, one set of second through holes having two second through holes. The liquid inlet pipe and the liquid outlet pipe are inserted through the two second through holes. The remaining sets of second through holes have one second through hole. The two straight cooling pipes of each set of second cooling pipes are inserted through the one second through hole.

11. The stator assembly as claimed in claim 10, characterized in that, The inlet pipe and the outlet pipe are respectively connected to the auxiliary inlet pipe and the auxiliary outlet pipe. The auxiliary inlet pipe and the auxiliary outlet pipe are also connected to a cold liquid pipe arranged around the end cap.

12. The stator assembly as described in claims 3 to 9, characterized in that, The first stator lamination group has a first corner and a first side on its radially outer side, and the first through hole is located at the first corner or the first side. The second stator lamination group has a second corner and a second side on its radially outer side, and the second through hole is located at the second corner or the second side.

13. The stator assembly as claimed in any one of claims 3 to 9, characterized in that, The first stator lamination group is provided with a first air duct hole, and the second stator lamination group is provided with a second air duct hole, which is connected to the first air duct hole.

14. The stator assembly as claimed in claim 13, characterized in that, The first air duct hole is located between two adjacent first through holes, and the second air duct hole is located between two adjacent second through holes.

15. The stator assembly as claimed in claim 13, characterized in that, The first air duct hole includes a first sub-air duct hole and a second sub-air duct hole, which are alternately distributed on the radial outer side of the first stator lamination group.

16. The stator assembly as claimed in claim 15, characterized in that, The second air duct hole is connected to the second sub-air duct hole.

17. The stator assembly as claimed in claim 15, characterized in that, A partition is provided between the first stator lamination group and the second stator lamination group. The partition is provided with a third through hole. The third through hole is connected to the first through hole and the second through hole. The first cooling pipe is also provided through the third through hole. The partition is used to cover the first sub-ventilation hole.

18. The stator assembly as claimed in claim 17, characterized in that, The first cooling pipe passes through the end of the first perforation and extends to the end face of the spacer away from the first stator lamination group.

19. The stator assembly as claimed in any one of claims 3 to 8, characterized in that, The first stator lamination group is provided with a first tooth pressure plate on the side away from the second stator lamination group. The first tooth pressure plate is provided with a fourth through hole, which communicates with the first through hole. The first cooling pipe is also provided through the fourth through hole. And / or, the second stator lamination group is provided with a second tooth pressure plate on the side away from the first stator lamination group, the second tooth pressure plate is provided with a fifth through hole, the fifth through hole is connected to the second through hole, and the second cooling pipe is also provided through the fifth through hole.

20. The stator assembly as claimed in any one of claims 3 to 9, characterized in that, The first stator lamination group is further provided with a first end plate on the side away from the second stator lamination group. The first end plate is provided with a sixth through hole, which communicates with the first through hole. The first cooling pipe is also provided through the sixth through hole. The first cooling pipe is welded to the first end plate. And / or, the second stator lamination group is further provided with a second end plate on the side away from the first stator lamination group, the second end plate is provided with a seventh through hole, the seventh through hole is connected to the second through hole, and the second cooling pipe is also provided through the seventh through hole; the second cooling pipe is welded to the second end plate.

21. The stator assembly as claimed in any one of claims 3 to 9, characterized in that, The stator assembly further includes a connector that connects the first stator lamination group and the second stator lamination group.

22. The stator assembly as claimed in any one of claims 3 to 9, characterized in that, The space between the first cooling pipe and the wall of the first perforation is filled with potting compound; And / or, the space between the second cooling pipe and the wall of the second perforation is filled with potting compound.

23. An electric motor, characterized in that, include: Stator assembly as described in any one of claims 1 to 22; The rotor is disposed within the stator assembly.

24. The motor as described in claim 23, characterized in that, include: The stator assembly is exposed in the installation environment outside the motor.

25. A drive assembly, characterized in that, Including the motor as described in claim 23 or 24.

26. A method for assembling a stator assembly as described in any one of claims 1 to 22, characterized in that, Includes the following steps: A plurality of stator laminations are provided, and the stator laminations are stacked to form a stator lamination group, wherein the stator lamination group is provided with a first through hole and a second through hole; The first cooling pipe is inserted into the first through hole; The first cooling pipe and the second cooling pipe are connected to form a connection part; The second cooling pipe is inserted into the second through hole, and the connecting part is located inside the second through hole; The inlet pipe and outlet pipe are connected to the first cooling pipe and / or the second cooling pipe, respectively, to form a continuous loop.

27. The method for assembling a stator assembly according to claim 26, characterized in that, Includes the following steps: Set up the first stator lamination group; The first cooling pipe is passed through the first perforation of the first stator lamination group; The first cooling pipe and the second cooling pipe are connected to form a connection part; Set up a second stator lamination group; The second cooling pipe is passed through the second through hole of the second stator lamination assembly so that the connection portion is located within the second through hole of the second stator lamination assembly.

28. The method for assembling a stator assembly as described in claim 27, characterized in that, The assembly method further includes: Pass the inlet pipe and outlet pipe through the first through hole of the first stator lamination assembly, and connect the end of the inlet pipe and outlet pipe away from the inlet to the second cooling pipe; Alternatively, the inlet pipe and the outlet pipe can be passed through the second perforation of the second stator lamination assembly, and the ends of the inlet pipe and the outlet pipe away from the inlet can be connected to the first cooling pipe, wherein the inlet pipe has an inlet and the outlet pipe has an outlet.

29. The method for assembling a stator assembly as described in claim 27, characterized in that, Before the step of "connecting the first cooling pipe and the second cooling pipe to form a connection", the method further includes: Spacers are stacked on the side of the first stator lamination group closest to the second stator lamination group.

30. The method for assembling a stator assembly as described in claim 27, characterized in that, Before the step of "setting up the first stator lamination group", the following is also included: Place the first end plate and / or the first tooth pressure plate; After the step of "passing the second cooling pipe through the second through hole of the second stator lamination assembly so that the connecting portion is located within the second through hole of the second stator lamination assembly", the method further includes: A second tooth pressure plate and / or a second end plate are placed on the side of the second stator lamination group away from the first stator lamination group.

31. The method for assembling a stator assembly as described in claim 27, characterized in that, After the step of "passing the second cooling pipe through the second through hole of the second stator lamination assembly so that the connecting portion is located within the second through hole of the second stator lamination assembly", the method further includes: Fill the space between the first cooling pipe and the wall of the first perforation with potting compound; And / or, fill the space between the second cooling pipe and the wall of the second perforation with potting compound.

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