Stator and method for assembling the same, assembly aid, electric machine and vehicle

Abstract

This disclosure relates to a stator and its assembly method, assembly auxiliary tooling, motor, and vehicle, belonging to the field of motor technology. The stator includes a stator core, windings, and multiple insulating components. The stator core is provided with at least one oil inlet passage, at least one oil outlet passage, and multiple stator slots. The windings are wound around the stator core through the multiple stator slots. The insulating components include connecting sections and two supporting sections. The connecting section includes two sealing portions, both distributed in the gap between the slot wall of the stator slot and the corresponding slot section of the winding. The two supporting sections are located at opposite ends of the stator slot along the axial direction. Each supporting section includes at least an annular portion located within the stator slot and connected to both sealing portions; the annular portion of the supporting section surrounds the corresponding slot section. The slot wall, the slot section, the two sealing portions, and the two supporting sections together form an in-slot oil passage, which communicates with the oil inlet and outlet passages. The stator of this disclosure is beneficial for improving the cooling efficiency of the motor.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, and in particular to a stator and its assembly method, assembly auxiliary tooling, motor and vehicle. Background Technology

[0002] During motor operation, the windings generate a large amount of heat. Since the components of the motor insulation system (enameled wire, insulating paper, insulating varnish, etc.) are mostly made of polymer materials, they will age after heating, leading to a decrease in mechanical and insulation performance. If heat dissipation is not timely or the heat dissipation performance is insufficient, the temperature of the motor insulation system components will be too high for a long time, which will accelerate the aging of the insulation system, thereby reducing the insulation performance, causing insulation failure, and thus causing motor failure, or even easily causing electrical safety accidents.

[0003] In related technologies, oil cooling solutions for motors allow the cooling oil to directly contact the components inside the motor and carry away heat. However, due to limitations in the oil circuit layout, it is difficult to directly and efficiently cool heat-generating components such as the stator windings. Heat dissipation is usually only achieved through conduction by cooling components such as the iron core and insulating paper, which limits the cooling efficiency of motor oil cooling solutions. Summary of the Invention

[0004] Therefore, this disclosure provides a stator and its assembly method, assembly auxiliary tooling, a motor, and a vehicle, which can help improve the cooling efficiency of the motor. The technical solution is as follows:

[0005] In a first aspect, a stator is provided, the stator comprising a stator core, windings and a plurality of insulating components; The stator core is provided with at least one oil inlet passage, at least one oil outlet passage, and multiple stator slots. The stator slots extend through the stator core axially, and the multiple stator slots are distributed at intervals along the circumference of the stator core. The winding passes through the plurality of stator slots and is wound on the stator core; The insulating component corresponds one-to-one with the stator slot, and the insulating component includes a connecting section and two supporting sections; The connecting section includes two sealing parts, which are distributed circumferentially in the gap between the slot wall of the stator slot and the slot section corresponding to the winding, and both sealing parts extend axially. The two support sections are located at opposite ends of the stator slot along the axial direction. At least a portion of the support section is located in the corresponding stator slot and is connected to one end of each of the two sealing portions. The portion of the support section located in the stator slot is annular, and the annular portion of the support section surrounds the corresponding slot section. The stator slot wall, together with the slot section, the two sealing parts and the two supporting sections located in the corresponding stator slot, form an in-slot oil passage. The in-slot oil passage is connected to at least one inlet oil passage and at least one outlet oil passage.

[0006] In some possible implementations, the stator core is provided with multiple oil inlet passages and multiple oil outlet passages, wherein one oil inlet passage and at least two oil outlet passages constitute a group of oil passages; Each set of oil inlet and oil outlet passages is distributed circumferentially along the stator core, and the two oil outlet passages are located on opposite sides of the oil inlet passage along the axial direction. The oil inlet and oil outlet of the same oil circuit group are both connected to the same oil passage in the tank.

[0007] In some possible implementations, the stator core is annular, and the plurality of stator slots are disposed on the radial inner side of the stator core.

[0008] In some possible implementations, the first end of the oil inlet passage is located radially outside the stator core, and the second end of the oil inlet passage is inclined along the radial direction of the stator core and axially connected to the corresponding oil passage in the slot. And / or, The oil outlet path includes a turning section and a spraying section; The first end of the turning section is connected to the oil passage in the groove, and the second end of the turning section extends radially outward from the stator core and inclined along the axial direction. The first end of the ejection section is connected to the second end of the turning section, and the second end of the ejection section extends axially toward the radially inner side of the stator core to the axial end face of the stator core. Preferably, when the oil outlet passage includes a bend, the second end of the bend extends radially outward toward the stator core and axially toward the end of the stator core facing the oil inlet passage.

[0009] In some possible implementations, the two blocking portions are located on opposite sides of the corresponding stator slot opening along the circumferential direction of the stator slot; Preferably, the two sealing portions are at least partially located on opposite sides of the corresponding groove sections.

[0010] In some possible implementations, the connecting section further includes a reinforcing portion located on the side of the corresponding slot section facing the corresponding stator slot opening, and the reinforcing portion and the two sealing portions are connected circumferentially to the corresponding stator slot.

[0011] In a second aspect, a method for assembling a stator is provided, the method being used to assemble the stator as described in any of the first aspects, and comprising the following steps: The insulating components of the stator are assembled onto the slotted section of the winding to form an assembly. The insulating component and the inner section of the groove are wrapped with wax; The assembly coated with solid wax is assembled into the stator slot of the stator core of the stator until all the assemblies are assembled on the stator core. The stator core on which the assembly is assembled is heated, causing the solid wax outside the assembly to melt into liquid wax, which is then discharged from each of the stator slots. Preferably, the insulating component comprises a foamed material.

[0012] Thirdly, an assembly auxiliary tooling is provided, which is used to obtain an assembly containing solid wax in the assembly method described in the second aspect, and includes a mold. The mold has a shaping hole, the radial section of which is consistent with the radial section of the stator slot of the stator, so as to facilitate the insertion of the assembly into the shaping hole along the axial direction of the shaping hole; Preferably, the shaped hole has a shoulder, wherein the winding can pass through the inside of the shoulder, and the shoulder can prevent the insulator from passing through.

[0013] Fourthly, an electric motor is provided, the electric motor comprising the stator described in any of the first aspects.

[0014] Fifthly, a vehicle is provided, the vehicle including the motor described in the fourth aspect.

[0015] In the scheme disclosed herein, the two sealing portions of the insulating component extend axially and are circumferentially spaced along the corresponding stator slots. Therefore, a channel extending axially along the stator slot can exist between the slot wall and the slot section of the winding. Furthermore, two support sections can respectively block both ends of this channel, supporting both ends of the slot section and preventing direct contact between the winding and the stator core, which could lead to short circuits or insulation failure to ground, resulting in localized overheating, efficiency reduction, or even motor damage. Thus, the slot wall, the slot section within the corresponding stator slot, the two sealing portions, and the two support sections can together form an in-slot oil passage extending axially along the stator slot. Cooling oil can enter the in-slot oil passage via the inlet oil passage and flow out via the outlet oil passage. Since the cooling oil can directly contact the winding within the in-slot oil passage, it is beneficial to improve the motor's cooling efficiency. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a stator provided in an embodiment of this disclosure; Figure 2 This is a front view structural diagram of a stator provided in an embodiment of this disclosure; Figure 3 This is one of the embodiments provided in this disclosure. Figure 2 Schematic diagram of cross-sectional structure AA; Figure 4 This is a schematic diagram of the structure of an assembly provided in an embodiment of this disclosure; Figure 5 This is one of the embodiments provided in this disclosure. Figure 3 Schematic diagram B of the enlarged local structure; Figure 6 This is one of the embodiments provided in this disclosure. Figure 2 Cross-sectional structural schematic diagram CC; Figure 7 This is one of the embodiments provided in this disclosure. Figure 6 A partially enlarged structural diagram, D; Figure 8 This is one of the embodiments provided in this disclosure. Figure 3 A partially enlarged structural diagram E; Figure 9 This is a schematic diagram of the structure of an insulating component provided in an embodiment of this disclosure; Figure 10 This is a schematic diagram of the structure of a mold and assembly provided in an embodiment of this disclosure; Figure 11 This is a front view structural diagram of a mold and assembly provided in an embodiment of this disclosure; Figure 12 This is a right-side view of a mold and assembly provided in an embodiment of this disclosure; Figure 13 This is one of the embodiments provided in this disclosure. Figure 12 FF, a schematic diagram of the cross-sectional structure; Figure 14 This is one of the embodiments provided in this disclosure. Figure 13 A partially enlarged structural diagram G; Figure 15 This is a schematic diagram of the left-side structure of a mold and assembly provided in an embodiment of this disclosure; Figure 16This is a schematic diagram of the assembly method provided in an embodiment of the present disclosure.

[0018] Explanation of reference numerals in the attached figures 100. Stator; 101. Assembly; 1. Stator core; 11. Oil inlet passage; 12. Oil outlet passage; 121. Turning section; 122. Ejection section; 13. Stator slot; 14. Oil passage in slot; 2. Winding; 21. Slot section; 3. Insulating component; 31. Connecting section; 311. Sealing part; 312. Reinforcing part; 32. Support section; 4. Mold; 41. Shaping hole; 411. Hole shoulder; 5. Electrical connection assembly. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in further detail below with reference to the accompanying drawings.

[0020] Firstly, this embodiment relates to a stator, as shown in the reference... Figure 1 As shown, the stator includes a stator core 1, windings 2, and multiple insulating components 3.

[0021] Combination Figure 2 , Figure 3 and Figure 6 As shown, the stator core 1 is provided with at least one oil inlet passage 11, at least one oil outlet passage 12, and multiple stator slots 13. Figure 6 As shown, the stator slot 13 extends through the stator core 1 along the axial direction, and multiple stator slots 13 are distributed at intervals along the circumference of the stator core 1. Here, the axial direction refers to the direction of the extension of the axis of the stator core 1.

[0022] Continue to refer to Figure 1 As shown, the winding 2 is wound around the stator core 1 through multiple stator slots 13. The insulating component 3 corresponds one-to-one with the stator slot 13.

[0023] refer to Figure 4 As shown, the insulating component 3 includes a connecting section 31 and two supporting sections 32.

[0024] Among them, reference Figure 7 and Figure 9As shown, the connecting section 31 includes two sealing portions 311. The two sealing portions 311 are distributed circumferentially in the gap between the slot wall of the stator slot 13 and the slot section 21 corresponding to the winding 2, and both sealing portions 311 extend axially. Because there is a circumferential gap between the two sealing portions 311, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Each stator slot 13 accommodates a portion of the winding 2, and the portion of the winding 2 located within each stator slot 13 is the slot section 21. The circumferential direction of the stator slot 13 refers to the circumferential direction around the axis of the stator slot 13. The axis of the stator slot 13 refers to the centerline of the section perpendicular to the extending direction of the stator slot 13.

[0025] The two support sections 32 are located at opposite ends of the stator slot 13 along the axial direction. Figure 1 As shown, at least a portion of the support section 32 is located within the corresponding stator slot 13. For example, the support section 32 may have only a portion near the sealing part 311 located within the corresponding stator slot 13, with the other portion located outside the stator slot 13; or the entire support section 32 may be located within the corresponding stator slot 13. Thus, the two support sections 32 can be supported around both ends of the slot section 21. Since the winding 2 is generally made of copper or aluminum wire, which has sufficient rigidity, the two support sections 32 supporting both ends of the slot section 21 can prevent the winding 2 from directly contacting the stator core 1, thus avoiding short circuits or insulation failure to ground, which could lead to localized overheating, reduced efficiency, or even motor damage.

[0026] like Figure 9 As shown, the support section 32 is connected to one end of each of the two sealing portions 311. At least the portion of the support section 32 located within the stator slot 13 is annular; for example, only the portion of the support section 32 located within the stator slot 13 may be annular, or the entire support section 32 may be annular. Figure 4 As shown, the annular portion of the support section 32 surrounds the corresponding groove section 21.

[0027] Combination Figure 3 , Figure 5 and Figure 7 As shown, the stator slot 13 wall, together with the slot section 21, two sealing parts 311, and two support sections 32 located within the corresponding stator slot 13, forms an in-slot oil passage 14. The in-slot oil passage 14 can extend axially, allowing the cooling oil to fully contact the slot section 21 after entering the in-slot oil passage 14, thus achieving sufficient cooling. Combined with... Figure 8 As shown, the oil passage 14 in the tank is connected to at least one oil inlet passage 11 and at least one oil outlet passage 12.

[0028] As described above, the two sealing portions 311 of the insulating component 3 extend axially and are circumferentially spaced along the corresponding stator slots 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, the two supporting sections 32 can respectively block both ends of this channel, supporting both ends of the slot section 21 to prevent the winding 2 from directly contacting the stator core 1, causing a short circuit or ground insulation failure, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located within the corresponding stator slot 13, the two sealing portions 311, and the two supporting sections 32 can together form an in-slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the in-slot oil passage 14 via the oil inlet passage 11 and flow out from the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 inside the slot, it can help improve the cooling efficiency of the motor.

[0029] In some examples, reference Figure 1 and Figure 3 As shown, the stator core 1 is provided with multiple oil inlet passages 11 and multiple oil outlet passages 12. One oil inlet passage 11 and at least two oil outlet passages 12 constitute a group of oil passages.

[0030] Among them, such as Figure 1 As shown, each set of oil inlet passages 11 and oil outlet passages 12 are distributed at intervals along the circumference of the stator core 1, and as... Figure 3 As shown, the two oil outlet passages 12 are located on both sides of the oil inlet passage 11 along the axial direction.

[0031] For example, each oil circuit group may include one inlet oil circuit 11 and two outlet oil circuits 12. The two outlet oil circuits 12 may be located on opposite sides of the inlet oil circuit 11. As another example, each oil circuit group may include one inlet oil circuit 11 and four outlet oil circuits 12. The four outlet oil circuits 12 may be located in pairs on opposite sides of the inlet oil circuit 11.

[0032] Combination Figure 5 and Figure 8 As shown, the inlet oil passage 11 and outlet oil passage 12 of the same oil circuit group are both connected to the same tank oil passage 14. Figure 5 and Figure 8 The straight arrows indicate the flow direction of the cooling oil in the inlet oil passage 11, the outlet oil passage 12, and the oil channel 14 in the tank.

[0033] In this way, the cooling oil can enter the slot oil passage 14 from the axial middle of the stator core 1 through the oil passage 11 in the middle of the axial direction, and preferentially contact the middle part of the slot section 21 where the heat is more concentrated and the heat dissipation is more difficult, and dissipate the heat, thereby improving the heat dissipation efficiency of the middle part of the slot section 21.

[0034] Subsequently, the oil in the slot 14 is divided into two streams along the axial middle, flowing to the oil outlet 12 located at both ends of the stator core 1, and finally exiting from the oil outlet 12. During this process, the cooling oil, which experiences a temperature rise due to heat exchange with the middle section 21, can dissipate heat at the two ends of the slot 21, where heat is relatively dispersed and heat dissipation is less difficult. After heat dissipation, the temperatures in the middle and both ends of the slot 21 can be more similar, which helps avoid uneven heat dissipation of the winding 2, thus improving the heat dissipation effect on the winding 2. Simultaneously, compared to the method of cooling oil flowing from one end of the stator core 1 to the other axially, the travel path of each stream of cooling oil inside the stator core 1 is shortened, but the total path traveled by the two streams of cooling oil remains unchanged, thus effectively improving heat dissipation efficiency.

[0035] In some examples, reference Figure 6 As shown, the stator core 1 is annular, and multiple stator slots 13 are arranged on the radial inner side of the stator core 1. In this way, the stator core 1 can be directly fixed to the motor housing by bolts or other means, and the radial outer side of the stator core 1 can directly contact the housing. Therefore, the oil inlet of the oil inlet 11 can be directly connected to the oil passage provided on the housing, eliminating the need for additional components for oil supply and simplifying the motor layout.

[0036] In this embodiment, the radial direction of the stator core 1 is the diameter direction of a circle centered on the axis of the stator core 1.

[0037] In some examples, the stator core 1 is generally made of several stacked silicon steel sheets. If the silicon steel sheets are radially penetrated, it will cause the silicon steel sheet to be cut with a crack, which will seriously damage the overall rigidity of the stator core 1. This may not only cause the stacked sheets of the stator core 1 to become loose, and increase vibration and noise, but for the core 1 that requires a press-fitted shell, it may also cause it to deform due to stress concentration during press-fitting.

[0038] refer to Figure 8 and combined Figure 3 and Figure 1 As shown, the first end of the oil inlet passage 11 is located on the radial outer side of the stator core 1, and the second end of the oil inlet passage 11 is connected to the corresponding oil passage 14 in the slot along the radial direction of the stator core 1 and along the axial direction.

[0039] Thus, by setting the oil inlet passage 11 at an angle, multiple interconnected punches can be sequentially opened on adjacent silicon steel sheets to achieve connection with the oil channel 14 in the slot, avoiding the radial penetration of a single silicon steel sheet, which is beneficial to improving the overall rigidity of the stator core 1.

[0040] In some examples, reference Figure 5 As shown, the oil outlet path 12 includes a turning section 121 and an injection section 122.

[0041] The first end of the turning section 121 is connected to the oil passage 14 in the groove, and the second end of the turning section 121 extends radially outward toward the stator core 1 and inclined along the axial direction.

[0042] In this way, the requirement to radially penetrate a single silicon steel sheet for the oil outlet passage 12 can be avoided, which is beneficial to improving the overall rigidity of the stator core 1. At the same time, since the bend section 121 and the oil channel 14 in the slot are set at approximately 90°, the cooling oil will encounter some resistance when entering the bend section 121 from the oil channel 14 in the slot. This can prevent the cooling oil from being mostly sprayed directly from the oil outlet end of the oil outlet passage 12 due to the fluid characteristics of "seeking the easy way out," which would make it difficult for the cooling oil to fully exchange heat with the slot section 21.

[0043] Continue to refer to Figure 5 As shown, the first end of the ejection section 122 is connected to the second end of the turning section 121, and the second end of the ejection section 122 extends radially inward toward the stator core 1 to the axial end face of the stator core 1. This allows the outlet of the oil passage 12 to be directed toward the end of the winding 2 wound on the stator core 1, cooling the end of the winding 2 and further improving the cooling efficiency of the winding 2.

[0044] In some examples, reference Figure 5 As shown, when the oil outlet passage 12 includes a bend section 121, the second end of the bend section 121 extends radially outward from the stator core 1 and axially towards the end of the oil inlet passage 11 facing the stator core 1. This increases the resistance encountered by the cooling oil when it enters the bend section 121 from the oil channel 14 in the slot, which is beneficial for increasing the heat exchange effect between the slot section 21 and the cooling oil, thereby further improving the efficiency of heat dissipation for the winding 2.

[0045] In some examples, reference Figure 7 As shown, the two sealing parts 311 are located on opposite sides of the stator slot 13 opening along the circumference of the stator slot 13. Thus, when the oil inlet passage 11 and the oil outlet passage 12 connect to the oil passage 14 within the slot through the wall of the stator slot 13, the sealing of the two sealing parts 311 prevents most of the cooling oil from flowing directly away from the center of the stator slot 13 opening after entering the oil passage 14, thus avoiding poor cooling effect and uneven cooling.

[0046] In some examples, reference Figure 7As shown, the two sealing portions 311 are at least partially located on opposite sides of the corresponding slot section 21. In this way, the two sealing portions 311 can support and clamp the opposite sides of the slot section 21, preventing possible shaking or displacement of the slot section 21, which could lead to direct contact between the slot section 21 and the stator core 1, resulting in a short circuit or insulation failure to ground, thereby causing localized overheating, efficiency reduction, or even motor damage. The radial direction of the slot section 21 refers to the circumferential direction around the axis of the stator slot 13.

[0047] In some examples, reference Figure 7 and Figure 9 As shown, the connecting section 31 also includes a reinforcing part 312, which is located on the side of the corresponding slot section 21 facing the opening of the corresponding stator slot 13. The reinforcing part 312 and the two sealing parts 311 are connected circumferentially along the corresponding stator slot 11. In this way, the connection between the reinforcing part 312 and the two sealing parts 311 can improve the strength of the connecting section 31, thereby helping to prevent damage to the insulating part 3.

[0048] In some examples, reference Figure 9 As shown, the reinforcing part 312 is also axially connected to both support sections 31. This helps to improve the strength of the connection between the connecting section 31 and the two support sections 31, thereby helping to prevent damage to the insulating part 3.

[0049] In some examples, the reinforcing part 312 is integrally formed with the two support sections 31 and the two sealing parts 311. Thus, the insulating part 3 can have high strength and avoid damage.

[0050] In some examples, reference Figure 9 As shown, insulating component 3 can be obtained by cutting and folding one-piece molded insulating paper. For example, in Figure 9 In this process, the insulating paper can be rectangular. The middle of both sides of the rectangular insulating paper can be cut to obtain two equal horizontal sections resembling an I-shape. The two horizontal sections of this I-shape can be folded to form a ring that wraps around the slot section 21 of the winding 2, becoming the two support sections 32 of the insulating component 3. One vertical section of the I-shape can be folded into a C-shape, partially wrapping around the slot section 21 of the winding 2, becoming the connecting section 31 of the insulating component 3. For example... Figure 7 As shown, one sealing section 311, one reinforcing section 312, and another sealing section 311 can be connected in sequence to form a C-shape and partially surround the inner section 21 of the groove. In this way, the insulating element 3 of the stator 100 of this embodiment can be formed by modifying existing insulating paper.

[0051] In some examples, reference Figure 1 As shown, the stator also includes an electrical connection assembly 5. The electrical connection assembly 5 is electrically connected to the winding 2. The electrical connection assembly 5 allows for electrical connection to a high-voltage power supply.

[0052] For example, the electrical connection assembly 5 may include a busbar and electrical connection wires. The busbar may be electrically connected to the neutral and phase lines of the winding 2, and then electrically connected to the high-voltage power supply through the electrical connection wires.

[0053] In this embodiment, the two sealing portions 311 of the insulating member 3 extend axially and are circumferentially spaced along the corresponding stator slots 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, the two supporting sections 32 can respectively block both ends of this channel, supporting both ends of the slot section 21 to prevent the winding 2 from directly contacting the stator core 1 and causing a short circuit or insulation failure to ground, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located within the corresponding stator slot 13, the two sealing portions 311, and the two supporting sections 32 can together form an in-slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the in-slot oil passage 14 via the oil inlet passage 11 and flow out from the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 inside the slot, it can help improve the cooling efficiency of the motor.

[0054] Secondly, this embodiment also provides a method for assembling a stator, referring to... Figure 16 As shown, the assembly method is used to assemble any one of the stators 100 in the first aspect, and includes the following steps: refer to Figure 16 As shown, the first step 001 includes: assembling the insulating component 3 of the stator 100 onto the slot section 21 of the winding 2 to form a structure. Figure 4 The assembly 101 shown.

[0055] For example, the two support sections 32 of the insulating member 3 can be arranged to surround the inner section 21 of the groove, while the connecting section 31 of the insulating member 3 can partially surround the inner section 21 of the groove.

[0056] The second step 002 includes: wrapping the insulating component 3 and the inner section 21 in the groove with wax. In this way, the wax can fix the relative position between the insulating component 3 and the inner section 21 in the groove, and at the same time protect the insulating component 3.

[0057] The third step 003 includes: assembling the assembly 101 wrapped with solid wax into the stator slot 13 of the stator core 1 of the stator 100, until all assemblies 101 are assembled on the stator core 1.

[0058] When assembly 101 is installed in stator slot 13, the solid wax coating on the outside of the insulating component 3 prevents friction between the insulating component 3 and the slot wall of stator slot 13, thus avoiding damage or tearing to the outer surface of the insulating component 3. Furthermore, when assembly 101 is installed in stator slot 13, the solid wax coating on the outside of the insulating component 3 and the slot section 21 can form a certain positioning with the slot wall of stator slot 13 due to friction, thereby improving the accuracy of the installation position of the insulating component 3 and the slot section 21 within stator slot 13.

[0059] Step 404 includes: heating the stator core 1 with the assembly 101, so that the solid wax outside the assembly 101 melts into liquid wax and is discharged from each stator slot 13. After the solid wax is melted into liquid wax, the liquid wax can be discharged from each stator slot 13 by standing or shaking through the oil passage 14, the oil outlet passage 12 and the oil inlet passage 11 in the slot.

[0060] The stator 100 obtained using the assembly method of this embodiment has two sealing portions 311 of the insulating component 3 extending axially and distributed circumferentially along the corresponding stator slots 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, two support sections 32 can respectively block both ends of this channel, supporting both ends of the slot section 21 to prevent the winding 2 from directly contacting the stator core 1 and causing a short circuit or insulation failure to ground, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located within the corresponding stator slot 13, the two sealing portions 311, and the two support sections 32 can together form an in-slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the in-slot oil passage 14 via the oil inlet passage 11 and flow out from the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 inside the slot, it can help improve the cooling efficiency of the motor.

[0061] In some examples, the insulating element 3 comprises a foamed material. For example, the insulating element 3 can be obtained by cutting and folding foamed insulating paper. Thus, the thickness of the insulating element 3 before assembly into the slot section 21 is less than the gap width between the slot section 21 and the wall of the stator slot 13. Therefore, after the assembly 101 is wrapped with solid wax, the wax-wrapped assembly 101 can be precisely fitted into the stator slot 13. Furthermore, when the solid wax is melted by heating, since the expansion temperature of the foamed material is higher than the melting point of the wax, the solid wax can be melted first during heating, and the temperature can be further increased to ensure complete melting. Until the heating temperature reaches the expansion temperature of the foamed material, the insulating element 3 made of foamed material can expand to fill the gap left by the wax discharge between the wall of the stator slot 13 and the insulating element 3. The expansion of the insulating element 3 can be completed simultaneously with the wax discharge.

[0062] Thirdly, this embodiment also provides an assembly auxiliary tooling, as shown in the reference. Figures 10 to 13 As shown, the assembly auxiliary tooling is used to obtain the assembly 101 wrapped with solid wax in the assembly method of the second aspect, and includes a mold 4.

[0063] like Figure 10 As shown, the mold 4 has a shaping hole 41 into which wax liquid can be injected. The radial cross-section of the shaping hole 41 is consistent with the radial cross-section of the stator slot 13 of the stator, so as to facilitate the insertion of the assembly 101 into the shaping hole 41 along the axial direction of the shaping hole 41. In this way, after obtaining the assembly 101 coated with solid wax, the assembly 101 coated with solid wax can be accurately assembled in the stator slot 13.

[0064] For example Figure 4 As shown, the insulating component 3 can be assembled onto the slot section 21 of the winding 2. Combined with... Figures 11 to 13 As shown, the winding 2 can pass through the shaped hole 41, so that the slot section 21 of the winding 2 and the insulating member 3 can be located inside the shaped hole 41.

[0065] Therefore, refer to Figure 16 As shown, the second step 002 of the assembly method may include: The second step 002a includes: injecting wax liquid into the shaping hole 41 of the assembly auxiliary tooling.

[0066] The second step 002b includes: inserting the assembly 101 into the shaping hole 41, and immersing the insulating part 3 and the groove section 21 into the wax liquid in the shaping hole 41 until the wax liquid solidifies into solid wax.

[0067] Furthermore, the third step 003 may also include: removing the assembly 101 wrapped with solid wax from the shaping hole 41 and assembling it into the stator slot 13 of the stator core 1 of the stator 100.

[0068] Thus, the assembly 101 wrapped with solid wax obtained by the assembly auxiliary tooling in this embodiment can be assembled onto the stator core 1. In the resulting stator 100, the two sealing portions 311 of the insulating member 3 extend axially and are distributed circumferentially along the corresponding stator slot 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, the two support sections 32 can respectively block the two ends of the channel, and the two support sections 32 can support the two ends of the slot section 21, preventing the winding 2 from directly contacting the stator core 1 and causing a short circuit or insulation failure to ground, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located in the corresponding stator slot 13, the two sealing portions 311, and the two support sections 32 can together form a slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the oil passage 14 in the slot through the oil inlet passage 11 and flow out through the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 in the slot, it can help improve the cooling efficiency of the motor.

[0069] In some examples, reference Figures 13 to 15 As shown, the shaped hole 41 has a shoulder 411, through which the winding 2 can pass. The shoulder 411 also prevents the insulator 3 from passing through. When the assembly 101 is inserted into the shaped hole 41, the shoulder 411 prevents the insulator 3 from protruding out of the shaped hole 41, thus preventing the insulator 3 from being completely coated with wax. This helps to avoid damage to the insulator 3 when it is assembled into the stator slot 13.

[0070] In some examples, when the insulating element 3 contains foamed material, its thickness before assembly into the slot section 21 is less than the gap width between the slot section 21 and the stator slot 13 wall. Therefore, the thickness of the insulating element 3 before assembly into the slot section 21 is also less than the gap width between the slot section 21 and the hole wall of the shaping hole 41. This helps to prevent damage to the insulating element 3 due to friction with the hole wall of the shaping hole 41 during insertion.

[0071] Fourthly, an electric motor is provided, the motor including any of the stators in the first aspect.

[0072] In this embodiment, the two sealing portions 311 of the insulating member 3 extend axially and are circumferentially spaced along the corresponding stator slots 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, the two supporting sections 32 can respectively block both ends of this channel, supporting both ends of the slot section 21 to prevent the winding 2 from directly contacting the stator core 1 and causing a short circuit or insulation failure to ground, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located within the corresponding stator slot 13, the two sealing portions 311, and the two supporting sections 32 can together form an in-slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the in-slot oil passage 14 via the oil inlet passage 11 and flow out from the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 inside the slot, it can help improve the cooling efficiency of the motor.

[0073] Fifthly, a vehicle is provided, the vehicle including the motor of the fourth aspect.

[0074] In this embodiment, the two sealing portions 311 of the insulating member 3 extend axially and are circumferentially spaced along the corresponding stator slots 13. Therefore, a channel extending axially along the stator slot 13 can exist between the slot wall of the stator slot 13 and the slot section 21 of the winding 2. Furthermore, the two supporting sections 32 can respectively block both ends of this channel, supporting both ends of the slot section 21 to prevent the winding 2 from directly contacting the stator core 1 and causing a short circuit or insulation failure to ground, which could lead to local overheating, efficiency reduction, or even motor damage. Thus, the slot wall of the stator slot 13, the slot section 21 located within the corresponding stator slot 13, the two sealing portions 311, and the two supporting sections 32 can together form an in-slot oil passage 14 extending axially along the stator slot 13. Cooling oil can enter the in-slot oil passage 14 via the oil inlet passage 11 and flow out from the oil outlet passage 12. Since the cooling oil can directly contact the winding 2 in the oil passage 14 inside the slot, it can help improve the cooling efficiency of the motor.

[0075] It should be noted that, in the description of this application, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0077] In the description of this specification, the references to the terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" refer to specific features, structures, materials, or characteristics described in connection with the embodiments or examples that are included in at least one embodiment or example of this application.

[0078] The above are merely embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A stator, characterized in that, The stator includes a stator core (1), windings (2) and multiple insulating components (3); The stator core (1) is provided with at least one oil inlet passage (11), at least one oil outlet passage (12) and multiple stator slots (13). The stator slots (13) penetrate the stator core (1) axially, and the multiple stator slots (13) are distributed at intervals along the circumference of the stator core (1). The winding (2) passes through the plurality of stator slots (13) and is wound on the stator core (1); The insulating component (3) corresponds one-to-one with the stator slot (13), and the insulating component (3) includes a connecting section (31) and two supporting sections (32). The connecting section (31) includes two sealing parts (311), which are distributed circumferentially in the gap between the slot wall of the stator slot (13) and the slot section (21) corresponding to the winding (2), and both sealing parts (311) extend axially. The two support sections (32) are located at opposite ends of the stator slot (13) along the axial direction. At least a portion of the support section (32) is located in the corresponding stator slot (13) and is connected to one end of each of the two sealing parts (311). The portion of the support section (32) located in the stator slot (13) is annular, and the annular portion of the support section (32) surrounds the corresponding slot section (21). The stator slot (13) wall, together with the slot section (21), the two sealing parts (311) and the two supporting sections (32) located in the corresponding stator slot (13), form a slot oil passage (14), which is connected to at least one inlet oil passage (11) and at least one outlet oil passage (12).

2. The stator according to claim 1, characterized in that, The stator core (1) is provided with multiple oil inlet passages (11) and multiple oil outlet passages (12), wherein one oil inlet passage (11) and at least two oil outlet passages (12) constitute a group of oil passages; Each set of oil inlet passages (11) and oil outlet passages (12) are distributed circumferentially along the stator core (1), and the two oil outlet passages (12) are located on both sides of the oil inlet passages (11) along the axial direction. The oil inlet passage (11) and the oil outlet passage (12) of the same oil circuit group are both connected to the same oil channel (14) in the tank.

3. The stator according to claim 1 or 2, characterized in that, The stator core (1) is annular, and the multiple stator slots (13) are all arranged on the radial inner side of the stator core (1).

4. The stator according to claim 3, characterized in that, The first end of the oil inlet passage (11) is located on the radial outer side of the stator core (1), and the second end of the oil inlet passage (11) is connected to the corresponding oil passage (14) in the groove along the radial direction of the stator core (1) and along the axial direction. And / or, The oil outlet path (12) includes a turning section (121) and an ejection section (122). The first end of the turning section (121) is connected to the oil passage (14) in the groove, and the second end of the turning section (121) extends radially outward toward the stator core (1) and inclined along the axial direction. The first end of the ejection section (122) is connected to the second end of the turning section (121), and the second end of the ejection section (122) extends radially inward toward the stator core (1) to the axial end face of the stator core (1). Preferably, when the oil outlet passage (12) includes a bend section (121), the second end of the bend section (121) extends radially outward toward the stator core (1) and axially toward the end of the stator core (1) facing the oil inlet passage (11).

5. The stator according to claim 1, characterized in that, The two sealing parts (311) are respectively located on opposite sides of the corresponding stator slot (13) opening along the circumferential direction of the stator slot (13); Preferably, the two sealing portions (311) are at least partially located on opposite sides of the corresponding groove section (21).

6. The stator according to claim 5, characterized in that, The connecting section (31) further includes a reinforcing part (312), which is located on the side of the corresponding slot section (21) facing the opening of the corresponding stator slot (13). The reinforcing part (312) and the two sealing parts (311) are connected circumferentially along the corresponding stator slot (11).

7. A method for assembling a stator, characterized in that, The assembly method is used to assemble the stator (100) according to any one of claims 1 to 6, and includes the following steps: The insulating part (3) of the stator (100) is assembled on the slot section (21) of the winding (2) to form an assembly (101). The insulating component (3) and the groove section (21) are wrapped with wax; The assembly (101) wrapped with solid wax is assembled into the stator slot (13) of the stator core (1) of the stator (100) until all the assemblies (101) are assembled on the stator core (1). The stator core (1) on which the assembly (101) is assembled is heated so that the solid wax outside the assembly (101) melts into liquid wax and is discharged from each of the stator slots (13); Preferably, the insulating element (3) comprises a foamed material.

8. An assembly auxiliary tooling, characterized in that, The assembly auxiliary tooling is used to obtain the assembly (101) wrapped with solid wax in the assembly method of claim 7, and includes a mold (4). The mold (4) has a shaping hole (41) with a radial cross section that is consistent with the radial cross section of the stator slot (13) of the stator, so as to facilitate the insertion of the assembly (101) into the shaping hole (41) along the axial direction of the shaping hole (41). Preferably, the shaped hole (41) has a shoulder (411) inside, wherein the winding (2) can pass through the inside of the shoulder (411), and the shoulder (411) can block the insulator (3) from passing through.

9. An electric motor, characterized in that, The motor includes the stator as described in any one of claims 1 to 6.

10. A vehicle, characterized in that, The vehicle includes the motor as described in claim 9.

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