Stator core lamination, stator assembly, motor, electric drive assembly, and vehicle

Abstract

A kind of stator core punching sheet, stator assembly, motor, electric assembly and vehicle, stator core punching sheet has flow channel and first stator slot for accommodating stator winding, first stator slot has in-slot winding area, flow channel is communicated to in-slot winding area.Flow channel is communicated to in-slot winding area, rather than slot opening area, cooling medium can be directly guided to the in-slot winding area of first stator slot, directly contact with stator winding, greatly reduce heat transfer thermal resistance, improve the cooling effect of stator winding.

Description

Technical Field

[0001] This disclosure relates to the field of motor technology, specifically to a stator core lamination, a stator assembly, a motor, an electric powertrain, and a vehicle. Background Technology

[0002] With the continuous development of new energy vehicles, the requirements for drive motors are becoming increasingly stringent. The higher the speed, torque density, and power density of the drive motor, the higher the heat generated. Therefore, the heat dissipation and cooling structure of the motor is essential for the reliable, stable, and efficient operation of the motor.

[0003] In related technologies, a cooling structure is set up to cool the stator core. However, the heat dissipation effect is not good for the stator windings in the stator slots, and it cannot meet the heat dissipation requirements of the motor. Summary of the Invention

[0004] The purpose of this disclosure is to provide a stator core lamination, stator assembly, motor, electric motor assembly, and vehicle to solve the heat dissipation problem of stator windings in stator slots.

[0005] To achieve the above objectives, this disclosure provides a stator core lamination, wherein the stator core lamination has the following characteristics: The first stator slot is used to accommodate the stator winding, and the first stator slot has an in-slot winding area; The flow channel connects to the winding area within the slot.

[0006] Optionally, the drainage channel includes microchannels located on both sides of the first stator slot in the circumferential direction, and the microchannels are multiple and arranged at radial intervals.

[0007] Optionally, the first stator slots are a plurality of slots arranged at intervals along the circumference. The flow channel includes a first flow channel and a plurality of micro-flow channels connected to the first flow channel. The first flow channel extends in the radial direction and is arranged between two adjacent first stator slots. A plurality of micro-flow channels are respectively provided on both sides of the first flow channel in the circumference direction. The plurality of micro-flow channels on the same side are respectively connected to the adjacent first stator slots.

[0008] Optionally, the stator winding includes multiple layers of conductors arranged radially, each layer of conductors having a chamfered outer contour, and an in-slot channel being formed between the chamfer of two adjacent layers of conductors and the inner wall of the first stator slot, with multiple microchannels and multiple in-slot channels arranged correspondingly.

[0009] Optionally, the first flow channel is a plurality of channels arranged at intervals along the circumference, and the stator core lamination has an annular flow channel arranged along the circumference and a second flow channel extending along the axial direction. The annular flow channel is connected to the plurality of first flow channels, and the second flow channel is connected to the annular flow channel.

[0010] Optionally, the second flow channel is a plurality of channels arranged at circumferential intervals along the annular flow channel.

[0011] Optionally, the axial projection of the plurality of second channels lies within the annular channel.

[0012] Optionally, the stator core laminations also have third channels for cooling the stator core yoke, wherein there are multiple third channels extending axially and the multiple third channels are arranged at intervals in the circumferential direction.

[0013] Optionally, in the radial direction, the annular flow channel is located between the first stator slot and the third flow channel.

[0014] According to a second aspect of this disclosure, a stator assembly is provided, comprising the stator core laminations described above.

[0015] Optionally, the stator assembly includes a stator core and a first end plate disposed at one axial end of the stator core. The first end plate is constructed as a stator core lamination, and the drainage channel is disposed on the first end face of the first end plate facing the stator core.

[0016] Optionally, the stator core is provided with an axial flow channel that runs through the axis, and the first end plate is provided with a third flow channel that runs through the axis. The stator assembly also includes a second end plate located at the other end of the stator core along the axis, and the second end plate is provided with a fourth flow channel that runs through the axis. The fourth flow channel, the axial flow channel, and the third flow channel are connected in sequence.

[0017] Optionally, the inner peripheral walls of the first end plate and the second end plate are provided with isolation portions that extend axially and protrude in a direction away from the stator core.

[0018] Optionally, the stator core is provided with a second stator slot that extends through the axial direction, the first end plate is provided with a first stator slot that extends through the axial direction, and the second end plate is provided with a third stator slot that extends through the axial direction. The third stator slot, the second stator slot and the first stator slot are connected in sequence.

[0019] Optionally, the stator winding includes multiple layers of conductors arranged radially, and the second stator slot is provided with insulating paper located between the second stator slot and the conductors.

[0020] Optionally, the insulating paper includes a first foamed insulating paper disposed between the conductor and the slot opening and / or the bottom of the second stator slot.

[0021] Optionally, the insulating paper includes aramid insulating paper disposed between the sidewall of the second stator slot between the slot bottom and the slot opening and the conductor.

[0022] Optionally, a second foamed insulating paper is provided around the first stator slot and / or the third stator slot, respectively, located between the corresponding stator slot and the conductor.

[0023] Optionally, the second foamed insulating paper has a first boss and a second boss located at both radial ends, the first boss and the second boss being able to axially abut against the insulating paper at the bottom and opening of the second stator slot, respectively.

[0024] According to a third aspect of this disclosure, an electric motor is provided, including the stator assembly described above.

[0025] Optionally, the motor includes a housing, the stator assembly is disposed inside the housing, and a first oil inlet is provided on the outer peripheral wall of the housing near the first end, the first oil inlet being able to communicate with the drainage channel.

[0026] Optionally, the motor includes a first oil ring disposed at a first end plate, the first oil ring having an annular oil cavity, the annular oil cavity having an inlet for communicating with the first oil inlet, the first end plate having a first oil inlet portion communicating with the drainage channel, and the annular oil cavity and the first oil inlet portion communicating with each other.

[0027] Optionally, the first end plate has a first end face facing the stator core, and the first oil inlet includes an annular flow channel disposed on the first end face and a plurality of second flow channels extending axially, the second flow channels communicating with the annular flow channel, and the annular oil cavity communicating with the annular flow channel through the second flow channels.

[0028] Optionally, the motor includes a second oil ring disposed at the second end plate, the outer peripheral wall of the second oil ring and the housing are spaced apart to form a second oil inlet, and a second oil inlet is provided on the outer peripheral wall of the housing near the second end, the second oil inlet being connected to the second oil inlet.

[0029] According to a fourth aspect of this disclosure, an electric powertrain is provided, including the motor described above.

[0030] According to a fifth aspect of this disclosure, a vehicle is provided, including the aforementioned motor or the aforementioned electric assembly.

[0031] Through the above technical solution, in the stator core provided in this disclosure, the flow channel is connected to the winding area inside the slot, rather than the slot opening area. The cooling medium can be directly guided to the winding area inside the first stator slot, making direct contact with the stator winding. The cooling medium flows axially to cool the stator winding, directly contacting the heat source, greatly reducing the thermal resistance of heat transfer, and effectively improving the cooling effect on the stator winding inside the first stator slot, thereby increasing the continuous running time and continuous rated power of the motor.

[0032] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0033] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 and Figure 2 This is a schematic diagram of the structure of an electric motor provided in an exemplary embodiment of this disclosure.

[0034] Figure 3 This is an exploded view of a stator assembly provided in an exemplary embodiment of this disclosure.

[0035] Figure 4 This is a schematic diagram of the structure of the first end plate in a stator assembly provided in an exemplary embodiment of the present disclosure.

[0036] Figure 5 yes Figure 4 A magnified view of part A in the middle.

[0037] Figure 6 This is a partially enlarged view of the first end plate in a stator assembly provided in an exemplary embodiment of this disclosure.

[0038] Figure 7 This is a schematic diagram of the location of the first oil ring in a stator assembly provided in an exemplary embodiment of this disclosure.

[0039] Figure 8 and Figure 9 This is a schematic diagram of the structure of the stator slot inside the stator core provided in an exemplary embodiment of the present disclosure, which shows the arrangement of the insulating paper.

[0040] Figure 10 and Figure 11 This is a schematic diagram of the structure of a stator core provided in an exemplary embodiment of the present disclosure, showing the arrangement of insulating paper in the stator slot of the first end plate.

[0041] Explanation of reference numerals in the attached figures 111-First stator slot; 112-Second stator slot; 113-Third stator slot; 1101-Slot winding area; 1102-Slot opening area; 12-First oil inlet; 121-Annular flow channel; 122-Second flow channel; 13-Drainage channel; 131-First flow channel; 132-Microflow channel; 14-Third flow channel; 15-Axial flow channel; 21-Conductor; 210-Chamfer; 211-Slot channel; 100-Stator core; 101-First end plate; 1011-First... 1012 - Second end face; 102 - Second end plate; 103 - First oil ring; 1031 - Annular oil cavity; 1032 - Inlet; 104 - Second oil ring; 1040 - Second oil inlet; 105 - Oil spraying ring; 3 - Insulating paper; 301 - First foamed insulating paper; 302 - Second foamed insulating paper; 311 - First boss; 312 - Second boss; 32 - Aramid insulating paper; 1000 - Isolation part; 4 - Shell; 41 - First oil inlet; 42 - Second oil inlet. Detailed Implementation

[0042] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0043] In this disclosure, unless otherwise stated, directional terms such as "axial," "circumferential," and "radial" generally refer to the axis of rotation of the motor provided in this disclosure, and "inner" and "outer" may refer to the inner and outer contours of the corresponding component or its location within or outside its environment, depending on the specific context. Furthermore, when the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The terms "first," "second," etc., used in this disclosure are for distinguishing one element from another and do not have sequential or material significance.

[0044] To address the heat dissipation problem of stator windings within the stator slots, related technologies have incorporated in-slot cooling oil pipes. However, this method is structurally complex, and assembling the cooling oil pipes into the slots is extremely difficult, posing a risk of breakage and making it unsuitable for mass production. Furthermore, placing the cooling oil pipes radially inside the windings significantly increases the difficulty of rotor assembly. Additionally, axial coolant flow creates dead zones, drastically reducing heat dissipation efficiency.

[0045] To solve the above problems, such as Figures 4 to 6 As shown, this disclosure provides a stator core lamination having a flow channel 13 and a first stator slot 111 for accommodating stator windings. The first stator slot 111 has an in-slot winding region 1101, and the flow channel 13 is connected to the in-slot winding region 1101.

[0046] It should be noted that the stator core 100 is typically formed by stacking multiple stator core laminations arranged axially. The stator core lamination located in the middle position can be designed as follows: Figures 4 to 6 The stator core laminations shown are suitable for embodiments where oil enters from the middle of the stator core and flows axially to both ends to cool the stator core and stator windings. The axial diameter of the stator core lamination located in the middle can be designed to be smaller to form an annular oil inlet groove in the middle of the stator core. The annular oil inlet groove is connected to the drainage channel 13, thereby realizing oil entry from the middle and flow out from the middle to both ends, cooling the stator windings in the stator slots along the way. Of course, this disclosure also includes the possibility that the first end plate 101 and the second end plate 102 at both axial ends of the stator core 100 can be designed as follows: Figures 4 to 6 The stator core laminations shown are applicable to embodiments where oil enters from one end and flows axially to the other end, and all fall within the scope of this disclosure. The structure of the stator core lamination will be described in detail below using the latter as an example. In the latter embodiment, the first end plate 101 and the second end plate 102 can be designed with the same structure or different structures. In embodiments with the same structure, the types of laminations forming the stator core can be reduced, the types of molds can be reduced, and costs can be lowered. Furthermore, the cooling medium here is typically cooling oil, coolant, or water, etc., and this disclosure does not impose specific limitations.

[0047] In addition, such as Figure 3 and Figure 9 As shown, the stator core 100 has a second stator slot 112 that extends axially, the first end plate 101 has a first stator slot 111 that extends axially, and the second end plate 102 has a third stator slot (not shown in the figure) that extends axially. The third stator slot, the second stator slot 112, and the first stator slot 111 are connected in sequence to accommodate the stator winding. Figure 9 As shown, the second stator slot 112 has an in-slot winding region 1101 and a slot opening region 1102. The multilayer conductor 21 of the stator winding is located in the in-slot winding region 1101, as shown in the figure. Figure 6 As shown, similar to the second stator slot 112, the first stator slot 111 has an in-slot winding region 1101. The difference is that it is enclosed at the position corresponding to the slot opening region 1102, and the flow channel 13 is connected to the in-slot winding region 1101 instead of the slot opening region 1102.

[0048] In the stator core laminations provided in this disclosure, the flow channel 13 is connected to the in-slot winding region 1101, rather than the slot opening region 1102, so that the cooling medium can be directly guided to the in-slot winding region 1101 of the first stator slot 111, and directly contact the stator winding. The cooling medium flows axially to cool the stator winding, directly contacting the heat source, greatly reducing the thermal resistance of heat transfer, and improving the cooling effect on the stator winding.

[0049] For example, such as Figure 5 and Figure 6 As shown, the drainage channel 13 includes microchannels 132 located on both sides of the first stator slot 111 in the circumferential direction. There can be multiple microchannels 132 arranged at radial intervals.

[0050] The cooling medium can enter the corresponding first stator slot 111 through the microchannels 132 on both sides. By setting multiple microchannels 132, the cooling of each part of the stator winding can be more uniform and efficient, effectively improving the cooling effect of the stator winding in the first stator slot 111, thereby increasing the continuous running time and continuous rated power of the motor.

[0051] For example, such as Figure 5 and Figure 6 As shown, the first stator slots 111 can be multiple ones arranged at intervals along the circumference. The flow channel 13 includes a first flow channel 131 and multiple micro-flow channels 132 connected to the first flow channel 131. The first flow channel 131 extends in the radial direction and is arranged between two adjacent first stator slots 111. Multiple micro-flow channels 132 are provided on both sides of the circumference of the first flow channel 131. Multiple micro-flow channels 132 on the same side are connected to the adjacent first stator slots 111.

[0052] The cooling medium flows into the first flow channel 131 and enters the first stator slots 111 on both sides through multiple micro-flow channels 132, so that the cooling medium can be evenly distributed in the first stator slots 111. Multiple micro-flow channels 132 of two adjacent first stator slots 111 can share the same first flow channel 131, which can save on the arrangement of flow channels and simplify the structural design of stator core laminations.

[0053] Regarding the source of the cooling medium in the first flow channel 131, for example, the first flow channel 131 can be multiple channels arranged circumferentially. The stator core lamination has an annular flow channel 121 arranged circumferentially and a second flow channel 122 extending axially. The annular flow channel 121 is connected to the multiple first flow channels 131, and the second flow channel 122 is connected to the annular flow channel 121.

[0054] Cooling medium enters the annular flow channel 121 from the second flow channel 122. Multiple first flow channels 131 are connected through the annular flow channel 121. Cooling medium enters multiple first flow channels 131 sequentially from the annular flow channel 121, which can provide cooling medium to multiple first flow channels 131 at the same time.

[0055] For example, such as Figure 8As shown, the stator winding includes multiple layers of conductors 21 arranged radially. The outer contour of each conductor layer 21 has a chamfer 210. A slot channel 211 is formed between the chamfer 210 of two adjacent conductor layers 21 and the inner wall of the first stator slot 111. The slot channel 211 is formed by the gap between the chamfers 210 of each conductor layer 21 in the first stator slot 111. The microchannel 132 is connected to the slot channel 211. Coolant is injected and fills the slot channel 211. The coolant flows along the axial channel to achieve direct cooling inside the slot. The slot channel 211 has little effect on the slot fill factor of the motor.

[0056] like Figure 5 and Figure 6 As shown, multiple microchannels 132 are provided on both sides of the first flow channel 131. The multiple microchannels 132 are arranged radially at intervals, and the multiple microchannels 132 and the multiple slot channels 211 are arranged in a one-to-one correspondence. In the slot direct cooling scheme provided in this embodiment, the cooling medium enters the first flow channel 131, flows radially and branches into multiple tree-like microchannels 132, which enter the first stator slots 111 on both sides and enter the corresponding slot channels 211 to cool the stator windings in the first stator slots 111, improve the convective heat transfer coefficient, and the cooling medium directly adheres to the conductors 21 in the first stator slots 111, which greatly shortens the thermal resistance and can cool various parts of the stator windings, avoid local overheating, and ensure the temperature uniformity of various parts of the stator windings.

[0057] like Figure 5 The first flow channel 131 extends from one end to the annular flow channel 121 and from the other end to the closed end near the first stator slot 111. From the bottom of the first stator slot 111 to the closed end, all parts of the stator winding can come into contact with the coolant, thereby improving the cooling effect on the stator winding.

[0058] For example, such as Figure 6 As shown, there can be multiple second flow channels 122 arranged circumferentially along the annular flow channel 121. Multiple second flow channels 122 can simultaneously provide cooling medium to the annular flow channel 121. The number of second flow channels 122 determines the speed at which the cooling medium fills the annular flow channel 121, and can be designed according to specific needs.

[0059] For example, the projection of multiple second flow channels 122 in the axial direction is located within the annular flow channel 121, which can realize the connection between multiple axially extended second flow channels 122 and the annular flow channel 121, so that the annular flow channel 121 can be quickly filled with cooling medium.

[0060] According to a second aspect of this disclosure, a stator assembly is provided, which includes the stator core laminations described above. This stator assembly possesses all the beneficial effects of the aforementioned stator core laminations, which will not be elaborated upon here. Here, the stator assembly may be an embodiment comprising only a stator core 100, in which the stator core 100 is formed by stacking multiple stator core laminations, with the middle stator core lamination designed as the stator core laminations described above. Alternatively, the stator assembly may be an embodiment including a stator core and stator windings. Alternatively, the stator assembly may include a stator core, stator windings, and a first end plate 101 and a second end plate 102 located at both axial ends of the stator core, in which the first end plate 101 and the second end plate 102 are designed as the stator core laminations described above; all of these fall within the protection scope of this disclosure.

[0061] In the embodiments provided in this disclosure, where oil enters at one end and exits at the other, such as Figure 1 and Figure 2 As shown, a direct cooling channel in the slot was designed to cool the stator winding; an outer cooling channel was designed to cool the stator core yoke. The design of two parallel oil circuits (inner and outer layers) makes the heat dissipation of the stator core more uniform and avoids the problem of thermal islands.

[0062] Regarding the outer cooling channel of the yoke, in this disclosure, the stator core 100 is provided with an axial flow channel 15 that runs through the axial direction, the first end plate 101 is provided with a third flow channel 14 that runs through the axial direction, and the second end plate 102 is provided with a fourth flow channel (not shown in the figure) that runs through the axial direction. The fourth flow channel, the axial flow channel 15 and the third flow channel 14 are connected in sequence to form the outer cooling channel of the yoke.

[0063] For example, there can be multiple third flow channels 14, which are arranged at intervals in the circumferential direction and are basically on the same circular trajectory, so as to achieve uniform cooling of all parts of the stator core 100 in the circumferential direction. Axial flow channels 15 can be designed on each layer of stator core laminations forming the stator core 100. The axial flow channels 15 of the multi-layer laminations are axially continuous to form flow channels for cooling the stator core yoke. The positions of multiple axial flow channels 15, multiple third flow channels 14 and multiple fifth flow channels can be completely aligned to form a straight outer layer cooling channel of the yoke, or they can be slightly staggered to form an inclined outer layer cooling channel of the yoke, both of which are within the protection scope of this disclosure.

[0064] In this disclosure, such as Figure 6As shown, in the radial direction, the annular flow channel 121 is located between the bottom of the first stator slot 111 and the third flow channel 14. The annular flow channel 121 is located inside the third flow channel 14 and outside the bottom of the first stator slot 111 in the radial direction. The inner and outer parallel oil circuits do not affect each other and respectively realize the cooling of the stator core and the stator winding.

[0065] For direct cooling channels within the tank, such as Figure 3 As shown, the stator assembly includes a stator core 100 and a first end plate 101 disposed at one axial end of the stator core 100. The first end plate 101 is provided with the drainage channel 13 described above and a plurality of first stator slots 111, and the drainage channel 13 is disposed on the first end face 1011 of the first end plate 101 facing the stator core 100. A first flow channel 131 and a micro-flow channel 132 are designed on the first end face 1011 of the first end plate 101 to realize the diversion of the cooling medium, so that each layer of conductors 21 in the first stator slots 111 are in contact with the cooling medium, and to avoid local overheating of the conductors in the first stator slots 111.

[0066] Utilizing the design of the flow channel 13 on the first end plate 101, several second flow channels 122 are arranged axially through the first end plate 101 and circumferentially. An annular flow channel 121 is opened on the side of the first end plate 101 facing the stator core, such as... Figure 6 As shown by the middle arrow, the cooling medium enters the annular flow channel 121 from the second flow channel 122, and then enters multiple first flow channels 131 in sequence. The cooling medium in the first flow channel 131 enters multiple micro-flow channels 132 in sequence, and then enters the corresponding in-slot channel 211 to achieve cooling of different conductors 21 in the slot.

[0067] like Figure 2 As shown, for the direct cooling channel in the slot, oil enters at the first end (right end) and exits at the second end (left end). The first end plate 101 is set at the first end. For the outer cooling channel of the yoke, oil enters at the second end (left end) and exits at the first end (right end). The first end can be the hairpin end and the second end can be the star point side. Both parallel channels allow low-temperature coolant to pass through preferentially, which can effectively reduce the temperature of the stator core and stator winding.

[0068] The stator assembly provided in this disclosure also includes a second end plate 102 disposed at the other axial end of the stator core 100. The inner peripheral walls of the first end plate 101 and the second end plate 102 are provided with an isolation portion 1000 extending axially and protruding away from the stator core 100. For example... Figure 3 As shown, the isolation portion 1000 of the first end plate 101 is provided on the second end face 1012, which can prevent cooling oil from splashing into the stator-rotor air gap.

[0069] Furthermore, in this disclosure, insulating paper 3 is respectively provided in the first stator slot 111 of the first end plate 101, the second stator slot 112 of the stator core 100, and the third stator slot of the second end plate 102 to ensure electrical insulation between the conductor 21 and the stator core 100, thereby ensuring the safety and stability of motor operation.

[0070] Exemplarily, the insulating paper 3 within the second stator slot 112 includes a first foamed insulating paper 301 disposed between the conductor 21 and the bottom and / or opening of the second stator slot 112. In this embodiment, as... Figure 8 and Figure 9 As shown, the second stator slot 112 has a first foamed insulating paper 301 at the bottom of the slot, located between the second stator slot 112 and the conductor 21. The first foamed insulating paper 301 can compress the conductor 21 within the slot when heated, reducing the gap between the conductors 21, thereby increasing the motor stiffness and reducing NVH risks, and providing a fixing effect on the conductor 21 within the stator slot. In other embodiments, the first foamed insulating paper 301 can also be arranged at the slot opening, and aramid insulating paper 32 can be arranged at other locations besides the slot opening. In embodiments where the first foamed insulating paper 301 is arranged at the bottom of the slot, aramid insulating paper 32 can be arranged at other locations besides the slot bottom. Of course, this disclosure also includes embodiments where the first foamed insulating paper 301 is arranged at both the slot bottom and the slot opening, all of which fall within the protection scope of this disclosure.

[0071] For example, aramid insulating paper 32 is provided between the side wall between the bottom and the opening of the second stator slot 112 and the conductor 21. The first foamed insulating paper 301 is avoided here, mainly because the first foamed insulating paper 301 will block the slot channel 211 described above when heated, affecting the flow of the cooling medium in the slot channel 211.

[0072] For example, such as Figure 10 As shown, a second foamed insulating paper 302 is respectively provided around the first stator slot 111, located between the first stator slot 111 and the conductor 21. Figure 11 As shown, the second foamed insulating paper 302 at this location has a first boss 311 at the bottom of the slot and a second boss 312 at the opening of the slot. The second foamed insulating paper 302 has two bosses, inner and outer, in the radial direction, for axially abutting against the insulating paper 3 at the bottom and opening of the second stator slot 112. Exemplarily, the first boss 311 and the second boss 312 can respectively engage with… Figure 9The first foamed insulating paper 301 located at the bottom of the slot and the aramid insulating paper 32 located at the opening of the slot are axially abutted. In other embodiments, the first foamed insulating paper 301 can also be axially abutted with the bottom and opening of the slot respectively, all of which are within the protection scope of this disclosure. After being heated, the second foamed insulating paper 302 fills the gap formed by the chamfer 210 between the conductors 21, which can prevent coolant from overflowing and play a role in end sealing. Of course, the insulating paper in the third stator slot of the second end plate 102 can also adopt a similar design to the insulating paper in the first stator slot 111, and this disclosure does not limit it.

[0073] By designing the insulating paper 3 in the first stator slot 111 of the first end plate 101, the second stator slot 112 of the stator core 100, and the third stator slot of the second end plate 102, it is possible not only to fix the conductor 21 in the corresponding stator slot and increase the stator insulation effect, but also to achieve the end coolant sealing effect.

[0074] According to a third aspect of this disclosure, an electric motor is provided that includes the stator assembly described above, and the motor has all the beneficial effects of the stator assembly described above, which will not be repeated here.

[0075] like Figure 2 As shown, the motor includes a housing 4 and a stator assembly disposed within the housing 4. A first oil inlet 41 is provided on the outer peripheral wall of the housing 4 near the first end. The first oil inlet 41 can be connected to the flow channel 13 to continuously supply oil to the flow channel 13.

[0076] For example, the stator assembly includes a stator core 100 and a first end plate 101 disposed at the end of the stator core 100. The motor includes a first oil ring 103 disposed at the first end plate 101. The first oil ring 103 has an annular oil cavity 1031, and the annular oil cavity 1031 has an inlet 1032 communicating with a first oil inlet 41. The first end plate 101 is provided with a first oil inlet portion 12 communicating with a drainage channel 13. The annular oil cavity 1031 and the first oil inlet portion 12 are connected. Here, the first end plate 101 can be an oil guide plate, and the first oil ring 103 can be an oil guide ring or an oil collecting ring. The coolant at the first oil inlet 41 on the housing 4 can be guided to the annular oil cavity 1031 through the inlet 1032, and then flow into the drainage channel 13 through the first oil inlet portion 12, thereby realizing the oil supply of the direct cooling channel in the tank.

[0077] For example, such as Figure 7As shown, the first oil inlet 12 includes an annular flow channel 121 and a plurality of axially extending second flow channels 122 disposed on the first end face 1011 of the first end plate 101. The second flow channels 122 are connected to the annular flow channel 121, and the annular oil cavity 1031 is connected to the annular flow channel 121 through the second flow channels 122. The first oil ring 103 can be fixed on the second end face 1012 of the first end plate 101, and the annular oil cavity 1031 of the first oil ring 103 is radially positioned to ensure communication with the second flow channels 122. Thus, as Figure 2 and Figure 6 As shown, for the direct cooling channel in the tank, the flow path is as follows: first oil inlet 41 - inlet 1032 - annular oil chamber 1031 - second flow channel 122 - annular flow channel 121 - first flow channel 131 - micro channel 132 - tank channel 211.

[0078] For example, the motor includes a second oil ring 104 disposed at the second end plate 102. The outer peripheral wall of the second oil ring 104 and the housing 4 are spaced apart to form a second oil inlet 1040. A second oil inlet 42 is provided on the outer peripheral wall of the housing 4 near the second end. The second oil inlet 42 is connected to the second oil inlet 1040 to realize the oil inlet of the outer cooling channel of the yoke described above. The direct cooling channel in the groove and the outer cooling channel of the yoke can coexist, and the two are designed in parallel without affecting each other, or only one of them can exist, both of which are within the protection scope of this disclosure. The second end plate 102 can be an oil baffle plate, and the second oil ring 104 can be an oil collecting ring. By designing the second oil ring 104, a second oil inlet 1040 connected to the third flow channel 14 can be formed between the housing 4 and the second oil ring 104.

[0079] In this disclosure, such as Figure 2 As shown, for the direct cooling channel in the tank, the coolant passes sequentially through the shell 4, the first oil ring 103, the drainage channel 13 on the first end plate 101, the channel 211 in the tank, and the microchannel 132 on the second end plate 102, and finally sprays onto the end winding of the second end; for the outer cooling channel of the yoke, the coolant passes through the shell 4, the second oil ring 104, the fourth flow channel on the second end plate 102, the axial flow channel of the stator core 100, the third flow channel 14 of the first end plate 101, and the oil spray ring 105, and finally sprays onto the end winding of the first end.

[0080] According to a fourth aspect of this disclosure, an electric power assembly is provided, which includes the motor described above and has all the beneficial effects of the motor described above, which will not be elaborated further here.

[0081] According to a fifth aspect of this disclosure, a vehicle is provided that includes the aforementioned motor or electric assembly. The motor may be a drive motor or a generator, and the vehicle may be a pure electric vehicle or a hybrid electric vehicle. The vehicle possesses all the beneficial effects of the aforementioned stator core laminations, stator assembly, motor, and electric assembly, which will not be repeated here.

[0082] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0083] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0084] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A stator core lamination, characterized in that, The stator core laminations have the following characteristics: The first stator slot is used to accommodate the stator winding, and the first stator slot has an in-slot winding area; The flow channel connects to the winding area within the slot.

2. The stator core lamination according to claim 1, characterized in that, The drainage channel includes microchannels located on both sides of the first stator slot in the circumferential direction, and the microchannels are multiple and arranged at radial intervals.

3. The stator core lamination according to claim 1, characterized in that, The first stator slots are multiple slots arranged at intervals along the circumference. The flow channel includes a first flow channel and multiple micro-flow channels connected to the first flow channel. The first flow channel extends in the radial direction and is arranged between two adjacent first stator slots. Multiple micro-flow channels are respectively provided on both sides of the first flow channel in the circumference direction. Multiple micro-flow channels on the same side are respectively connected to the adjacent first stator slots.

4. The stator core lamination according to any one of claims 2 or 3, characterized in that, The stator winding includes multiple layers of conductors arranged radially. The outer contour of each layer of conductors has a chamfer. An in-slot channel is formed between the chamfer of two adjacent layers of conductors and the inner wall of the first stator slot. Multiple microchannels and multiple in-slot channels are arranged correspondingly.

5. The stator core lamination according to claim 3, characterized in that, The first flow channel consists of multiple channels arranged at intervals along the circumference. The stator core lamination has an annular flow channel arranged along the circumference and a second flow channel extending along the axial direction. The annular flow channel is connected to the multiple first flow channels, and the second flow channel is connected to the annular flow channel.

6. The stator core lamination according to claim 5, characterized in that, The second flow channel is a plurality of channels arranged at intervals along the circumference of the annular flow channel.

7. The stator core lamination according to claim 6, characterized in that, The axial projections of the plurality of second channels lie within the annular channel.

8. The stator core lamination according to claim 5, characterized in that, The stator core lamination also has a third flow channel for cooling the stator core yoke, and the third flow channel is multiple and extends axially, with the multiple third flow channels arranged at intervals in the circumferential direction.

9. The stator core lamination according to claim 8, characterized in that, In the radial direction, the annular flow channel is located between the first stator slot and the third flow channel.

10. A stator assembly, characterized in that, Including the stator core laminations as described in any one of claims 1 to 9.

11. The stator assembly according to claim 10, characterized in that, The stator assembly includes a stator core and a first end plate disposed at one axial end of the stator core. The first end plate is constructed as a stator core lamination, and the drainage channel is disposed on the first end face of the first end plate facing the stator core.

12. The stator assembly according to claim 11, characterized in that, The stator core is provided with an axial flow channel that runs through the axis, and the first end plate is provided with a third flow channel that runs through the axis. The stator assembly also includes a second end plate located at the other end of the stator core along the axis. The second end plate is provided with a fourth flow channel that runs through the axis. The fourth flow channel, the axial flow channel, and the third flow channel are connected in sequence.

13. The stator assembly according to claim 12, characterized in that, The inner peripheral walls of the first end plate and the second end plate are provided with isolation portions that extend axially and protrude away from the stator core.

14. The stator assembly according to claim 12, characterized in that, The stator core is provided with a second stator slot that runs through the axis, the first end plate is provided with a first stator slot that runs through the axis, and the second end plate is provided with a third stator slot that runs through the axis. The third stator slot, the second stator slot and the first stator slot are connected in sequence.

15. The stator assembly according to claim 14, characterized in that, The stator winding includes multiple layers of conductors arranged radially, and the second stator slot is provided with insulating paper located between the second stator slot and the conductors.

16. The stator assembly according to claim 15, characterized in that, The insulating paper includes a first foamed insulating paper disposed between the conductor and the slot opening and / or the bottom of the second stator slot.

17. The stator assembly according to claim 16, characterized in that, The insulating paper includes aramid insulating paper disposed between the sidewall between the bottom and the opening of the second stator slot and the conductor.

18. The stator assembly according to claim 16, characterized in that, The first stator slot and / or the third stator slot are respectively provided with a second foamed insulating paper located between the corresponding stator slot and the conductor.

19. The stator assembly according to claim 18, characterized in that, The second foamed insulating paper has a first protrusion and a second protrusion located at both radial ends, and the first protrusion and the second protrusion can respectively abut against the insulating paper at the bottom and the opening of the second stator slot.

20. An electric motor, characterized in that, Includes the stator assembly according to any one of claims 10-19.

21. The motor according to claim 20, characterized in that, The motor includes a housing, the stator assembly is disposed inside the housing, and a first oil inlet is provided on the outer peripheral wall of the housing near the first end, the first oil inlet being able to communicate with the drainage channel.

22. The motor according to claim 21, characterized in that, The motor includes a first oil ring disposed at a first end plate. The first oil ring has an annular oil cavity. The annular oil cavity has an inlet that communicates with the first oil inlet. The first end plate has a first oil inlet that communicates with the drainage channel. The annular oil cavity and the first oil inlet are connected.

23. The motor according to claim 22, characterized in that, The first end plate has a first end face facing the stator core. The first oil inlet includes an annular flow channel disposed on the first end face and a plurality of second flow channels extending axially. The second flow channels are connected to the annular flow channel. The annular oil cavity is connected to the annular flow channel through the second flow channels.

24. The motor according to claim 21, characterized in that, The motor includes a second oil ring located at the second end plate. The outer peripheral wall of the second oil ring and the housing are spaced apart to form a second oil inlet. A second oil inlet is provided on the outer peripheral wall of the housing near the second end. The second oil inlet is connected to the second oil inlet.

25. An electric powertrain, characterized in that, The motor included in any one of claims 20-24.

26. A vehicle, characterized in that, Includes the motor according to any one of claims 20-24 or the electric assembly according to claim 25.

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