Stator assembly

Abstract

The invention provides a stator assembly, which comprises a plurality of winding assemblies and a shell, and is characterized in that the plurality of winding assemblies are arranged in an annular array, and each winding assembly comprises stator teeth and a winding coil sleeving the stator teeth; the shell comprises two end plates and a side wall arranged between the two end plates, and the stator teeth are installed between the two end plates; the stator assembly further comprises a first cooling part and a second cooling part, the first cooling part comprises a liquid inlet and a liquid outlet which are formed in the shell, a flowing gap is formed between the adjacent winding assemblies or between the winding assemblies and the shell, and the liquid inlet is communicated with the liquid outlet through the flowing gap; a portion of the second cooling member is proximate to the winding assembly and disposed within the flow gap. On the basis of oil cooling, the second cooling component is additionally arranged, and the part with poor cooling effect or special cooling requirement in the oil cooling channel is subjected to supplementary cooling, so that the cooling effect is more excellent than that in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly. Background Art

[0002] With the continuous innovation in the field of motor design and manufacturing, motors are rapidly developing towards miniaturization, high power and high utilization. The improvement of motor efficiency has also brought about problems such as high load and high heat of the motor. Therefore, improving the heat dissipation and cooling capacity of the motor has become one of the important issues to improve the working performance of the motor.

[0003] In the prior art, heat dissipation capacity is an important factor restricting the further improvement of motor power density. As the stator plate is an important component constituting the closed cavity of the axial magnetic field motor stator assembly, its temperature resistance is particularly important. In order to ensure the temperature resistance of the stator plate, people usually use stator plates with high temperature resistance grades, but this undoubtedly greatly increases the material cost, thereby increasing the cost and manufacturing difficulty. Summary of the invention

[0004] Based on this, an object of the present invention is to provide a stator assembly to reduce the requirements of the motor on the temperature resistance level of the stator plate, thereby reducing the material cost of the stator plate.

[0005] The present invention provides a stator assembly, comprising:

[0006] A winding assembly, wherein there are a plurality of winding assemblies, the plurality of winding assemblies are arranged in a ring array, and the winding assembly comprises stator teeth and a winding coil sleeved on the stator teeth;

[0007] A housing, the housing comprising two end plates and a side wall arranged between the two end plates, the stator teeth being installed between the two end plates; the stator assembly further comprising a first cooling component and a second cooling component, the first cooling component comprising a liquid inlet and a liquid outlet arranged on the housing, a flow gap being arranged between adjacent winding assemblies or between the winding assemblies and the housing, the liquid inlet being communicated with the liquid outlet through the flow gap;

[0008] A portion of the second cooling member is adjacent to the winding assembly and is disposed within the flow gap.

[0009] Furthermore, in the stator assembly, the second cooling component is a cooling pipe, and the space inside the cooling pipe is isolated from the flow gap by a pipe wall and is not connected.

[0010] Furthermore, in the stator assembly, a portion of the second cooling component is arranged between the end plate and the end surface of the winding coil, and is located between two adjacent stator teeth.

[0011] Furthermore, in the stator assembly, the liquid inlet, the liquid outlet and the flow gap are connected with cooling oil, and the cooling pipe is connected with cooling water.

[0012] Furthermore, in the stator assembly, the number of the cooling tubes is two, a portion of one of the cooling tubes is arranged between the end plate and the upper end surface of the winding coil, and a portion of the other cooling tube is arranged between the end plate and the lower end surface of the winding coil.

[0013] Furthermore, in the stator assembly, a bridge wire is connected between the two winding coils, and the bridge wire is located outside the winding coil and between the two cooling tubes.

[0014] Furthermore, in the stator assembly, at least two winding coils are provided on the stator teeth, and the cooling pipe is provided between two adjacent winding coils along the axial direction of the shell and is located between two adjacent stator teeth.

[0015] Furthermore, in the stator assembly, two winding coils are arranged on the stator teeth, the number of the cooling tube is one, and the cooling tube is arranged between the two winding coils along the axial direction of the shell.

[0016] Furthermore, in the stator assembly, the cooling pipe is a non-closed loop, so that an inlet and outlet for cooling water are formed at the head and tail ends of the cooling pipe, and a plurality of openings are provided on the end plate, and the openings are used for the inlet and outlet of the head and tail ends of the cooling pipe to pass through.

[0017] Furthermore, the stator assembly, wherein, starting from one of the inlet and outlet of the cooling pipe, the cooling pipe is wound around each of the stator teeth in an S-shape, having a first portion fitting the outer edge of the stator tooth, a second portion fitting the inner edge of the stator tooth, and a third portion located between two adjacent stator teeth.

[0018] Furthermore, in the stator assembly, the shell also includes an inner wall, and the inner wall is sleeved on the inside of the two end plates, so that a closed stator cavity is formed between the side wall and the inner wall, and the winding assembly is arranged in the stator cavity.

[0019] Furthermore, in the stator assembly, an outer ring flow channel is formed between the side wall and the winding assembly, an inner ring flow channel is formed between the inner wall and the winding assembly, and an inter-tooth flow channel is formed between two adjacent winding assemblies, and the outer ring flow channel is connected to the inner ring flow channel through the inter-tooth flow channel to form the flow gap.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. On the basis of oil cooling, a second cooling component is added to provide supplementary cooling for parts in the oil cooling channel with poor cooling effect or with special cooling needs, thereby achieving a better cooling effect than the prior art.

[0022] 2. The second cooling component is arranged close to the winding assembly, so as to directly take away the heat generated by the winding assembly and greatly reduce the heat transferred from the winding assembly to the stator plate, thereby improving the thermal environment of the stator plate, reducing the motor's requirements for the temperature resistance level of the stator plate, saving the material cost of the stator plate, and further improving the power density of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of a stator assembly in the first embodiment of the present invention;

[0024] Figure 2 It is an assembly diagram of the winding and the cooling tube in the first embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the specific structure of the cooling tube in the first embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the specific structure of an end plate in the first embodiment of the present invention;

[0027] Figure 5 It is a schematic diagram of the specific structure of another end plate in the first embodiment of the present invention;

[0028] Figure 6 It is an assembly diagram of the winding coil and the cooling tube in the second embodiment of the present invention;

[0029] Description of main component symbols:

[0030] 11. End plate; 12. Side wall; 13. Inner wall; 21. Stator teeth; 22. Winding coil; 23. Bridge wire; 30. Cooling pipe; 31. First part; 32. Second part; 33. Third part; 34. Inlet and outlet; 41. Outer ring flow channel; 42. Inner ring flow channel; 43. Inter-tooth flow channel; 44. Liquid inlet; 45. Liquid outlet; 51. Limiting groove; 52. Outer retaining ring; 53. Inner retaining ring; 61. First mounting hole; 62. Second mounting hole; 63. First threaded hole; 64. Second threaded hole; 65. Screw; 70. Opening; 80. Reinforcement rib; 91. Wire outlet hole; 92. Terminal.

[0031] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. Several embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0033] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0035] See also Figure 1 and Figure 2 The stator assembly in the first embodiment of the present invention is mainly used in an axial magnetic field motor, wherein the stator assembly includes a shell and a winding assembly, and the winding assembly has multiple winding assemblies, and the multiple winding assemblies are arranged in a ring array. The winding assembly includes stator teeth 21 and winding coils 22 sleeved on the stator teeth 21. The shell includes two end plates 11 and a side wall 12 arranged between the two end plates 11. The end plate 11 is the stator plate of the stator assembly, and the stator teeth 21 are installed between the two end plates 11.

[0036] In this embodiment, the stator assembly also includes a first cooling component and a second cooling component, the first cooling component includes a liquid inlet 44 and a liquid outlet 45 provided on the shell, a flow gap is provided between adjacent winding assemblies or between the winding assemblies and the shell, and cooling oil is passed through the liquid inlet 44, the liquid outlet 45 and the flow gap, so that the winding coil 22 and the stator teeth 21 serving as heat sources are directly immersed in the cooling oil, and heat is taken away by the flow of the cooling oil.

[0037] A portion of the second cooling component is close to the winding assembly and placed in the flow gap. Specifically, the second cooling component is a cooling pipe 30. The space inside the cooling pipe 30 is isolated from the flow gap by the pipe wall. Cooling water flows into the cooling pipe 30 to directly take away the heat of the winding assembly and greatly reduce the heat transferred from the winding coil 22 to the stator plate, thereby improving the heating environment of the stator plate, reducing the motor's requirements on the temperature resistance level of the stator plate, saving the material cost of the stator plate, and further improving the motor power density.

[0038] It can be seen that in this embodiment, two cooling methods exist simultaneously inside the closed shell, namely, a mixture of oil cooling and water cooling. It can be understood that, on the basis of oil cooling, water cooling is additionally provided to supplement cooling of the parts in the oil cooling channel with poor cooling effect or with special cooling needs, thereby achieving a better cooling effect than the prior art.

[0039] It should be noted that, in this embodiment, the cooling medium introduced into the cooling pipe 30 and the flow gap is not limited to cooling water and cooling oil, and can be adjusted according to actual conditions. The cooling medium can be recycled, for example, by cooling the cooling medium that absorbs heat for recycling again. The cooling pipe 30 can also be made of a material with good thermal conductivity, absorb heat and transfer it to the outside of the shell.

[0040] like Figure 2 and Figure 3 As shown, a portion of the second cooling component is arranged between the end plate 11 and the end surface of the winding coil 22, and is located between two adjacent stator teeth 21. Specifically, in this embodiment, each of the stator teeth 21 is provided with a winding coil 22, and the winding coils 22 on each of the stator teeth 21 are connected by a bridge line 23 to form a three-phase winding. Of course, it can also be two-phase or six-phase. This embodiment is only an example and not a limitation. There are two cooling tubes 30, a portion of one of the cooling tubes 30 is arranged between the end plate 11 and the upper end surface of the winding coil 22, and a portion of the other cooling tube 30 is arranged between the end plate 11 and the lower end surface of the winding coil 22, and is in close contact with it.

[0041] It can be understood that since the winding coil 22 is formed by winding the wire layer by layer around the stator teeth 21 in a certain winding direction, the two layers of wires near the ends of the stator teeth 21 on both sides of the axial direction, namely the upper end face and the lower end face of the winding coil 22, have more severe eddy current effects due to the more drastic change of the magnetic field at this position, and greater eddy current losses will be generated inside the two layers of wires. If there is no cooling tube 30, the two layers of wires will directly contact the end plate 11, which will cause the end plate 11 to be heated more severely. Therefore, in this embodiment, a cooling tube 30 is provided between the end plate 11 and the upper end face of the winding coil 22, and between the end plate 11 and the lower end face of the winding coil 22. On the one hand, it blocks the heat from being directly transferred to the end plate 11, and on the other hand, cooling water is passed into the cooling tube 30, which can directly take away the heat of the two layers of conductors, thereby greatly improving the heating environment of the stator plate.

[0042] Further, such as Figure 3 As shown, a bridge wire 23 is connected between the two winding coils 22. The bridge wire 23 is located on the outside of the winding coil 22 and between the two cooling tubes 30, further increasing the contact area between the cooling tube 30 and the winding assembly, and further improving the cooling efficiency.

[0043] It should be noted that the bridge wire 23 adopts an outer circle bridge structure, and the tail end of the previous coil is connected to the head end of the next coil through the bridge wire 23, so that the bridge wire 23 is arranged in a spiral form. Of course, an inner circle bridge structure can also be used in other embodiments.

[0044] For details, see Figure 1 , Figure 3 and Figure 4 As shown, the cooling pipe 30 is a non-closed loop, so that an inlet and outlet 34 for cooling water is formed at the head and tail ends of the cooling pipe 30, and a plurality of openings 70 are provided on the end plate 11, and the openings 70 are used for the inlet and outlet 34 at the head and tail ends of the cooling pipe 30 to pass through. Secondly, after the cooling pipe 30 passes through the openings 70, the gap between the cooling pipe 30 and the openings 70 needs to be sealed to prevent the cooling oil in the housing from leaking out from the gap between the cooling pipe 30 and the openings 70.

[0045] Continue reading Figure 3, starting from one of the inlets and outlets 34 of the cooling pipe 30, the cooling pipe 30 winds through each of the stator teeth 21 in an S-shaped form, and has a first portion 31 that fits the outer edge of the stator tooth 21, a second portion 32 that fits the inner edge of the stator tooth 21, and a third portion 33 located between two adjacent stator teeth 21. The cooling pipe 30 is located in the open slot between two adjacent stator teeth 21, and is arranged in an S-shaped manner to pass through two adjacent stator teeth 21 in sequence, effectively avoiding the axial dimension of the stator assembly from becoming longer, thereby increasing the installation space of the motor and reducing the use efficiency of the motor.

[0046] In addition, the cooling tube 30 is attached to the axial surface of the winding coil 22 and the circumferential surface of the stator tooth 21 and arranged in an S shape, which increases the contact area between the cooling tube 30 and the winding assembly and effectively improves the cooling efficiency.

[0047] When the motor is working, cooling water can be introduced from the inlet and outlet 34 at one end of the cooling pipe 30, so that the cooling water circulates through the first part 31, the third part 33 and the second part 32 in sequence, and is finally discharged from the inlet and outlet 34 at the other end. The discharged cooling water is returned to the cooling pipe 30 after cooling down. This cycle can not only directly take away the heat generated by the winding assembly, but also block the path of heat transfer from the winding coil 22 to the end plate 11, thereby greatly improving the heating environment of the stator plate.

[0048] Specifically, Figure 2 , Figure 4 and Figure 5 As shown, the housing also includes an inner wall 13, and the inner wall 13 is sleeved inside the two end plates 11, so that a closed stator cavity is formed between the side wall 12 and the inner wall 13, and the winding assembly is arranged in the stator cavity. Specifically, the housing is annular and has a short dimension in the axial direction, so as to avoid the axial dimension of the stator assembly structure being too long and increase the motor installation space. Among them, the end plate 11 can be made of a composite material with high strength and good insulation performance to improve the structural strength of the stator assembly.

[0049] The side wall 12 is connected to the corresponding outer edge between the two end plates 11, and the inner wall 13 is connected to the corresponding inner edge between the two end plates 11. The side wall 12 surrounds the outer circle position of the stator tooth 21 and forms an outer circle flow channel 41 between the stator tooth 21. The inner wall 13 is set at the inner circle position of the stator tooth 21 and forms an inner circle flow channel 42 between the stator tooth 21. An inter-tooth flow channel 43 is formed between two adjacent stator teeth 21. The inner circle flow channel 42 is connected to the outer circle flow channel 41 through the inter-tooth flow channel 43 to form a flow gap.

[0050] Further, such as Figure 1 , Figure 2 and Figure 4 As shown, in this embodiment, one of the end plates 11 is a stator plate for outlet, and a liquid inlet 44 and a liquid outlet 45 are arranged on the end surface thereof, wherein the liquid inlet 44 is used to introduce cooling oil into the flow gap, and the liquid outlet 45 is used to lead the cooling oil in the flow gap outward. It can be understood that when the motor is running, cooling oil is introduced into the flow gap through one of the liquid inlets 44, and the other liquid outlet 45 is used to lead the cooling oil in the flow gap out after heat exchange, and the cooling oil after being led out is returned to the housing after cooling down, and this cycle is repeated, which can greatly reduce the heat generated by the stator teeth 21 and the winding coil 22.

[0051] Among them, the liquid inlet 44 and the liquid outlet 45 can be flexibly arranged on the end plate 11, and the flow rate of cooling oil and cooling water can be adjusted as needed. The flow rate depends on the size of each inlet / outlet 45 and the diameter of the cooling pipe 30 to achieve the best comprehensive heat dissipation effect.

[0052] Further, such as Figure 4 and Figure 5 As shown, a limiting groove 51 matching the profile of the stator teeth 21, an outer retaining ring 52 engaging with the side wall 12, and an inner retaining ring 53 engaging with the inner wall 13 are respectively provided on the adjacent surfaces of the two end plates 11. A reinforcing rib 80 is provided between two adjacent limiting grooves 51 to ensure the structural strength of the stator plate, and the provision of the outer retaining ring 52 and the inner retaining ring 53 is used to accurately position the side wall 12 and the inner wall 13 on the end plate 11 when assembling the stator assembly. Specifically, the outer retaining ring 52 engages with the inner edge of the side wall 12, and the inner retaining ring 53 engages with the inner edge of the inner wall 13, so as to effectively avoid displacement during installation.

[0053] Furthermore, high-strength structural adhesive can be used on the basis of the engagement between the outer retaining ring 52 and the side wall 12, and the engagement between the inner retaining ring 53 and the inner wall 13, so as to further enhance the sealing of the connection and prevent the cooling oil from leaking out.

[0054] In this embodiment, the end plate 11, the inner wall 13 and the side wall 12 are connected and fixed by screws 65. Figure 1 , Figure 2 and Figure 4, a plurality of first mounting holes 61 surrounding its own outer retaining ring 52 and a plurality of second mounting holes 62 provided in the inner retaining ring 53 are provided on the end plate 11, a first threaded hole 63 corresponding to the first mounting hole 61 is provided on the end surface of the side wall 12, a screw 65 can be inserted from the first mounting hole 61 and threadedly connected to the first threaded hole 63, thereby fixing the side wall 12 on the end plate 11, a second threaded hole 64 corresponding to the second mounting hole 62 is provided on the end surface of the inner wall 13, a screw 65 can be inserted from the second mounting hole 62 and threadedly connected to the second threaded hole 64, thereby fixing the inner wall 13 on the end plate 11, and the other end plate 11 opposite to this is assembled on the side wall 12 and the inner wall 13 in the same way, and the two end plates 11 after assembly are respectively located on the left and right sides of the side wall 12.

[0055] In addition, since a three-phase winding is used in this embodiment, three wire outlet holes 91 are provided on one of the end plates 11 to correspond to the lead-out of the terminal posts 92 of the U, V, and W phases in the winding assembly. Similarly, this part needs to be sealed after the terminal posts 92 of the three-phase winding are led out to ensure the sealing of the shell.

[0056] Furthermore, in the embodiment of the present invention, in order to ensure the heat transfer efficiency, the cooling tube 30 is made of a non-magnetic material with high thermal conductivity. Currently, the more common materials with high thermal conductivity are metals and ceramics, and the thermal conductivity is between 30 and 200 W / mK. Therefore, the cooling tube 30 can be made of metal or ceramics. However, considering that the cooling tube 30 is a hollow pipe with a complex shape, the cooling tube 30 made of ceramic material can only be sintered as a whole using a mold and a sand core. The process is complex and the yield is low, and the cost is high. Therefore, in the embodiment of the present invention, the cooling tube 30 is preferably made of a metal material with both toughness and ductility, such as copper or aluminum. A metal hollow tube can be bent as required to form a cooling tube 30. The process is relatively simple and the yield is relatively high. Compared with ceramic materials, the cooling tube 30 made of metal materials has better strength and impact resistance. In addition, copper and aluminum also have high corrosion resistance and can resist corrosion and oxidation in the cooling medium.

[0057] It should be noted that, since metal materials are conductive, eddy current losses will be generated when the motor is running. In order to control the eddy current losses within an acceptable range, the metal cooling tube 30 used is required to have a resistivity as high as possible and a wall thickness as small as possible, that is, the cooling tube 30 is preferably made of a metal with a high resistivity. However, too thin a wall thickness is not suitable, and it is easy to crack during the bending process. Therefore, the selection of wall thickness needs to balance these two aspects, and it should be calculated and selected based on the specific motor design parameters and the tube diameter.

[0058] Of course, in other embodiments, superconducting heat pipes and other high thermal conductivity materials may also be used, such as copper oxide superconductors, caoutchouc superconductors, etc.

[0059] Furthermore, the cross-section of the cooling tube 30 can be one of circular, rectangular, elliptical, and waist-shaped, and in this embodiment, it is preferably rectangular. The cross-sectional shapes of the cooling tubes 30 in the pipeline structure of the axial magnetic field motor can be the same or different, or some of the cooling tubes 30 can adopt one cross-sectional shape, and the remaining cooling tubes 30 can adopt another shape.

[0060] In summary, the stator assembly in the above embodiment of the present invention, on the basis of oil cooling, is additionally provided with a second cooling component to supplement cooling of the parts in the oil cooling channel with poor cooling effect or with special cooling needs, thereby achieving a better cooling effect than the prior art. Secondly, the second cooling component is arranged close to the winding assembly, so as to directly take away the heat generated by the winding assembly and greatly reduce the heat transferred from the winding assembly to the stator plate, thereby improving the heating environment of the stator plate, reducing the motor's requirements for the temperature resistance level of the stator plate, saving the material cost of the stator plate, and further improving the power density of the motor.

[0061] Please refer to Figure 6 , which shows a stator assembly in a second embodiment of the present invention. The difference between the stator assembly in this embodiment and the stator assembly in the first embodiment is that at least two winding coils 22 are arranged on the stator teeth 21, and the cooling pipe 30 is arranged between two adjacent winding coils 22 along the axial direction of the shell, and is located between two adjacent stator teeth 21. Specifically, in this embodiment, two winding coils 22 are arranged on the stator teeth 21, and the number of the cooling pipe 30 is one, and the cooling pipe 30 is arranged between the two winding coils 22 along the axial direction of the shell. A bridge wire 23 is connected between the two winding coils 22 on the same layer, and the bridge wire 23 is located outside the winding coil 22, and the cooling pipe 30 is located between the two bridge wires 23 in the axial direction.

[0062] In this embodiment, the cooling tube 30 between the two winding coils 22 can cool the winding coils 22 on the upper and lower sides at the same time, indirectly reducing the heat transfer from the winding to the end plate 11. Compared with the structure of the double cooling tube 30 in the first embodiment, the single cooling tube 30 structure used in this embodiment has lower cost and can also improve the heating environment of the stator plate.

[0063] The third embodiment of the present invention further provides an axial magnetic field motor, comprising the stator assembly described in the above technical solution.

[0064] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A stator assembly, comprising: A winding assembly, wherein there are a plurality of winding assemblies, the plurality of winding assemblies are arranged in a ring array, and the winding assembly comprises stator teeth and a winding coil sleeved on the stator teeth; A housing, the housing comprising two end plates and a side wall arranged between the two end plates, the stator teeth being installed between the two end plates; characterized in that the stator assembly further comprises a first cooling component and a second cooling component, the first cooling component comprising a liquid inlet and a liquid outlet arranged on the housing, a flow gap is arranged between adjacent winding assemblies or between the winding assembly and the housing, the liquid inlet and the liquid outlet are connected through the flow gap; A portion of the second cooling member is adjacent to the winding assembly and is disposed within the flow gap.

2. The stator assembly according to claim 1, characterized in that: The second cooling component is a cooling pipe, and the space inside the cooling pipe is isolated from the flow gap by a pipe wall and is not connected.

3. The stator assembly according to claim 1, characterized in that: A portion of the second cooling member is arranged between the end plate and an end surface of the winding coil and is located between two adjacent stator teeth.

4. The stator assembly according to claim 2, characterized in that: The liquid inlet, the liquid outlet and the flow gap are connected with cooling oil, and the cooling pipe is connected with cooling water.

5. The stator assembly according to claim 3, characterized in that: There are two cooling tubes, a portion of one cooling tube is disposed between the end plate and the upper end surface of the winding coil, and a portion of the other cooling tube is disposed between the end plate and the lower end surface of the winding coil.

6. The stator assembly according to claim 5, characterized in that: A bridge wire is connected between the two winding coils. The bridge wire is located outside the winding coils and between the two cooling tubes.

7. The stator assembly according to claim 2, characterized in that: At least two winding coils are arranged on the stator teeth, and the cooling pipe is arranged between two adjacent winding coils along the axial direction of the shell and is located between two adjacent stator teeth.

8. The stator assembly according to claim 7, characterized in that: Two winding coils are arranged on the stator teeth, the number of the cooling tube is one, and the cooling tube is arranged between the two winding coils along the axial direction of the shell.

9. The stator assembly according to any one of claims 2, 4 to 8, characterized in that: The cooling pipe is a non-closed loop, so that an inlet and outlet for cooling water are formed at the head and tail ends of the cooling pipe, and a plurality of openings are arranged on the end plate, and the openings are used for the inlet and outlet of the head and tail ends of the cooling pipe to pass through.

10. The stator assembly according to claim 9, characterized in that: Starting from one of the inlets and outlets of the cooling pipe, the cooling pipe winds around each of the stator teeth in an S-shape, and has a first portion fitting the outer edge of the stator tooth, a second portion fitting the inner edge of the stator tooth, and a third portion located between two adjacent stator teeth.

11. The stator assembly according to claim 1, characterized in that: The shell also includes an inner wall, which is sleeved on the inside of the two end plates, so that a closed stator cavity is formed between the side wall and the inner wall, and the winding assembly is arranged in the stator cavity.

12. The stator assembly according to claim 11, characterized in that: An outer circle flow channel is formed between the side wall and the winding assembly, an inner circle flow channel is formed between the inner wall and the winding assembly, and an inter-tooth flow channel is formed between two adjacent winding assemblies. The outer circle flow channel is connected to the inner circle flow channel through the inter-tooth flow channel to form the flow gap.

Images