Stator assembly and electric machine

Abstract

The application provides a stator assembly and a motor. The stator assembly comprises a shell and a plurality of stator laminations which are stacked along an axial direction. The shell is configured to mount the stator laminations. The stator laminations comprise first stator laminations and second stator laminations. The first stator laminations form an intermediate stack. The intermediate stack is provided with the second stator laminations at one end in the axial direction. The outer circumferential surface of the first stator laminations is circumferentially provided with first recessed areas. The first recessed areas of adjacent first stator laminations are circumferentially connected to each other to form a continuous oil channel at the outer periphery of the intermediate stack. The second stator laminations are provided with first oil holes which are connected to the oil channel. The oil channel formed by the first recessed areas which are connected to each other allows the oil to directly enter the stator laminations through the oil channel without being guided or transferred through the annular oil channel of the shell. The heat loss of the oil during transmission is reduced, and the cooling response speed is improved.

Description

Technical Field

[0001] This application relates to the field of motor technology, and more particularly to a stator assembly and a motor. Background Technology

[0002] During motor operation, the stator core generates a large amount of heat due to factors such as electromagnetic induction. If this heat cannot be dissipated in time, the motor temperature will rise, affecting the motor's operating efficiency, lifespan, and reliability. Therefore, effective cooling of the stator core is crucial.

[0003] Currently, to cool the stator core, related technologies often employ an annular oil groove on the casing. Oil from the groove enters the oil holes of the stator laminations through the recesses, thus cooling the stator core. However, this design, relying on the annular oil groove in the casing, has certain limitations.

[0004] On the one hand, adding annular oil grooves to the housing increases the complexity of housing processing, raising manufacturing difficulty and production costs. Especially for housings with compact structures or special materials, machining annular oil grooves may be difficult due to space or process limitations. On the other hand, the presence of annular oil grooves may affect the structural strength of the housing. During motor operation, the housing needs to withstand certain stresses; the addition of annular oil grooves may lead to stress concentration, reducing the overall load-bearing capacity of the housing.

[0005] In view of the above, this application is hereby submitted. Utility Model Content

[0006] This application provides a stator assembly and motor that enables oil to enter the stator laminations to effectively cool the stator core without the need for an annular oil groove in the housing.

[0007] In a first aspect, embodiments of this application provide a stator assembly, which includes at least a housing and a plurality of stator laminations stacked sequentially along an axial direction, wherein the housing is configured to mount the stator laminations;

[0008] The stator lamination includes a first stator lamination and a second stator lamination. Multiple first stator laminations form an intermediate stacking section. The outer circumferential surface of the first stator lamination has a first concave area distributed therein. The first concave areas of adjacent first stator laminations are interconnected in the circumferential direction to form a continuous oil passage on the outer periphery of the intermediate stacking section.

[0009] The second stator lamination is located at the axial end of the intermediate stacking section. The second stator lamination is provided with a first oil hole, which is connected to an oil passage.

[0010] By setting up interconnected oil channels in the first concave area, the oil can directly enter the stator laminations without needing to be diverted or transferred through the annular oil channel in the housing, thus reducing heat loss during oil transmission and improving cooling response speed.

[0011] The oil passages are formed by the first recessed area of ​​the stator laminations themselves. During assembly, there is no need to align the oil passages on the housing with the lamination structure; only the stacking accuracy of the stator laminations needs to be ensured. This reduces the positioning requirements during assembly, minimizes assembly errors, and improves production efficiency.

[0012] In one possible embodiment, the stator lamination includes a third stator lamination disposed between the first stator lamination and the second stator lamination. The outer circumferential surface of the third stator lamination has a second concave region distributed therein, wherein the arc length of the second concave region is smaller than the arc length of the first concave region.

[0013] In one possible embodiment, the second recess of the third stator lamination adjacent to the first stator lamination is connected to the corresponding first recess of the first stator lamination.

[0014] In one possible embodiment, the stator lamination further includes a fourth stator lamination disposed between the first stator lamination and the second stator lamination, and the outer periphery of the fourth stator lamination is circular.

[0015] The fourth stator lamination has a third oil hole. The distance between the third oil hole and the center is greater than the distance between the first oil hole and the center, or the diameters of the first oil hole and the third oil hole are different.

[0016] In one possible embodiment, the stator lamination further includes a fourth stator lamination disposed between the second stator lamination and the third stator lamination, the fourth stator lamination having a circular outer periphery.

[0017] In one possible embodiment, the stack height of the intermediate stacking section accounts for 5%-30% of the total stack height of the stator laminations.

[0018] In one possible embodiment, a boss is provided on the outer periphery of the first stator lamination, the boss being located in a first recessed area, and the boss is configured to distribute adhesive to achieve bonding between the first stator laminations.

[0019] In one possible embodiment, the stator laminations are stacked using segmented welding, self-adhesive sheets, or integral injection molding.

[0020] In one possible embodiment, multiple first stator laminations are stacked along the axial direction to form multiple sets of intermediate stacked sections. Along the axial direction of the stator laminations, adjacent intermediate stacked sections are rotated by a certain angle around the axial central axis in a first direction. The total height of the first stator laminations at different rotation angles is the same.

[0021] Secondly, embodiments of this application provide an electric motor, which includes a stator assembly and a rotor assembly as described in the first aspect, with the stator assembly sleeved around the rotor assembly.

[0022] The stator assembly and motor provided in this application embodiment include a plurality of first stator laminations and second stator laminations disposed at both ends of the first stator laminations along the axial direction. By providing interconnected first recessed areas on the outer periphery of the first stator laminations, oil can be accommodated to flow in, thereby achieving oil inlet in the middle of the stator laminations, so as to meet the cooling requirements of the stator core without providing an annular oil groove in the housing. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This is a partial structural diagram of the assembly of the housing and stator laminations in related technologies.

[0025] Figure 2 This is a schematic diagram of the stator lamination structure in related technologies;

[0026] Figure 3 A partial structural diagram of the assembly of the housing and stator laminations provided in an embodiment of this application;

[0027] Figure 4 This is a schematic diagram of the stator lamination structure provided in the embodiments of this application;

[0028] Figure 5 A three-dimensional structural schematic diagram of another stator lamination provided in an embodiment of this application;

[0029] Figure 6 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0030] Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment;

[0031] Figure 8 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0032] Figure 9 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0033] Figure 10 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0034] Figure 11 This is a schematic diagram of the structure of the first stator lamination provided in an embodiment of this application;

[0035] Figure 12 This is a schematic diagram of the structure of another first stator lamination provided in an embodiment of this application;

[0036] Figure 13 This is a schematic diagram of the structure of the second stator lamination provided in an embodiment of this application;

[0037] Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in an embodiment of this application;

[0038] Figure 15 This is a schematic diagram of the structure of the fourth stator lamination provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached figures:

[0040] 1-Stator lamination; 10-First stator lamination; 20-Second stator lamination;

[0041] 101 - Stator slot; 30 - Third stator lamination; 40 - Fourth stator lamination;

[0042] 11-First concave area; 12-Protrusion; 31-Second concave area;

[0043] 21 - First oil hole; 32 - Second oil hole; 41 - Third oil hole;

[0044] 2-Housing; 201-Annular oil passage.

[0045] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0046] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of this application and are not intended to limit this application.

[0047] It should be noted that if the embodiments of this application involve directional indications (such as up, down, left, right, front, back, etc.), these directional indications are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly. If the embodiments of this application involve descriptions such as "first" or "second," these descriptions are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" can explicitly or implicitly include at least one of those features. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0048] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0049] Stator assemblies can be used in motors, such as motors for new energy vehicles and motors for mechanical equipment; this is not a limitation.

[0050] Understandably, an electric motor includes a stator assembly and a rotor assembly. The rotor assembly includes a rotor core and a shaft; the stator assembly includes a stator core and stator windings.

[0051] The stator core comprises multiple stator laminations stacked sequentially along the axial direction. Stator slots are evenly distributed on the inner circumference of the stator laminations for embedding stator windings to form an electromagnetic circuit. The stator windings can be wound into multi-layered structures to meet different practical needs, which are not limited here.

[0052] In related technologies, refer to Figure 1 , Figure 2 , Figure 1 This is a partial structural diagram of the assembly of the housing and stator laminations in related technologies. Figure 2 This is a schematic diagram of the stator lamination structure in related technologies.

[0053] The stator assembly includes a housing 2 and stator laminations 1. The housing 2 has an annular oil passage 201 inside. The stator laminations 1 include first stator laminations 10 and second stator laminations 20. Multiple first stator laminations 10 are arranged, and these multiple first stator laminations 10 are tightly stacked axially to form an intermediate stacked section, which serves as the main structure of the stator assembly. Second stator laminations 20 are provided at both ends of the intermediate stacked section along its axial direction.

[0054] A recessed area is provided on the outer peripheral surface of the first stator lamination 10 to receive oil from the annular oil channel 201. However, this structural design that relies on the annular oil channel 201 of the housing 2 has limitations. On the one hand, the annular oil channel 201 inside the housing 2 increases the processing complexity of the housing 2, and the opening of the annular oil channel 201 on the housing 2 will affect the structural strength of the housing 2 and reduce the overall load-bearing capacity of the housing 2.

[0055] Based on the above, this application proposes a stator assembly, referring to... Figure 3 , Figure 3 This is a partial structural diagram of the assembly of the housing and stator laminations provided in the embodiment of this application. The housing 2 of the stator assembly does not have an annular oil passage 201 inside, and a first recess 11 is provided on the outer periphery of the first stator lamination 10. The first recesses 11 of adjacent first stator laminations 10 are circumferentially connected, so that oil can enter the stator lamination 1 without the annular oil passage 201 of the housing 2.

[0056] Based on the above, referring to Figure 3 As shown in the figure, it is a partial schematic diagram of the installation of the housing 2 and the stator lamination 1. The stator assembly includes the housing 2, and the housing 2 does not have an annular oil passage 201.

[0057] The stator assembly also includes an oil injection component, which is used to deliver oil to the oil channels of the stator lamination 1. The core of the oil injection component lies in its structural design (including at least the shape, position, and flow rate of the oil nozzle) to guide external oil into the oil channels formed by the stator lamination 1.

[0058] It should be noted that those skilled in the art can select either pressure-type or splash-type oil injection components based on motor power and cooling requirements, taking into account cooling efficiency, cost, and reliability.

[0059] Reference Figure 4 , Figure 11 As shown, Figure 4 This is a schematic diagram of the structure of a stator lamination provided in an embodiment of this application. Figure 11 This is a schematic diagram of the structure of the first stator lamination provided in an embodiment of this application.

[0060] The stator assembly includes a first stator lamination 10 and a second stator lamination 20. Multiple first stator laminations 10 form an intermediate stacked section, and the second stator laminations 20 are disposed at the axial ends of the intermediate stacked section. The second stator laminations 20 can be disposed on one side or both sides.

[0061] The outer circular surface of the first stator lamination 10 has a first recessed area 11 distributed in the circumferential direction. The first recessed areas 11 of adjacent first stator laminations 10 are interconnected in the circumferential direction to form a continuous circumferential oil passage on the outer periphery of the middle stacked section.

[0062] Reference Figure 13 , Figure 13 This is a schematic diagram of the structure of a second stator lamination provided in an embodiment of this application. The second stator lamination 20 is provided with a first oil hole 21, which is connected to the oil passage formed by the first stator lamination 10.

[0063] By connecting the first recesses 11 in the circumferential direction, the spatial connection of adjacent first recesses 11 is achieved, so that the first recesses 11 dispersed on each stator lamination 1 are combined to form oil channels continuously distributed along the outer periphery of the middle stacking section, providing a path basis for the oil to flow in the circumferential and axial directions. In conjunction with the first oil hole 21 of the second stator lamination 20, the oil can achieve efficient circulation and cooling in the stator assembly.

[0064] Reference Figure 4 , Figure 4 This is a schematic diagram of the stator lamination provided in the embodiment of this application. The direction of the dashed arrow in the figure is a schematic diagram of the oil transmission path. The oil channel runs through the outer periphery of the intermediate stacking section. The oil can flow in from one end in the axial direction and flow in both the circumferential and axial directions at the same time, eventually covering the entire outer periphery area of ​​the intermediate stacking section.

[0065] By setting up oil channels formed by interconnected first recessed areas 11, the oil can directly enter the stator lamination 1 through the oil channels without having to pass through the annular oil channels of the housing 2 for diversion or transfer, which reduces the heat loss of the oil during the transmission process and improves the cooling response speed.

[0066] The oil passage is formed by the first recess 11 of the stator lamination 1 itself. During assembly, it is not necessary to align the annular oil passage of the housing 2 with the lamination structure; only the stacking accuracy of the stator lamination 1 needs to be ensured. This reduces the positioning requirements during assembly, reduces assembly errors, and improves production efficiency.

[0067] In some possible implementations, refer to Figure 5 , Figure 5 This is a three-dimensional structural diagram of another stator lamination provided in an embodiment of this application. The stator lamination 1 includes a third stator lamination 30, which is disposed between the first stator lamination 10 and the second stator lamination 20.

[0068] Reference Figure 14 , Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in the embodiment of this application. The outer circular surface of the third stator lamination 30 has a second concave region 31 distributed in the circumferential direction, wherein the arc length of the second concave region 31 is smaller than the arc length of the first concave region 11.

[0069] The third stator lamination 30 serves as a transition piece between the first stator lamination 10 and the second stator lamination 20. Its outer circular surface has a shorter second recess 31, meaning the solid portion of the non-recessed area is longer. This structure provides a wider solid support surface between the first recess 11 and the first oil hole 21 of the second stator lamination 20, reducing the problem of weak lamination edges caused by the longer arc length of the first recess 11, and reducing deformation problems during stacking.

[0070] When the motor is running, the stator lamination 1 will generate axial stress due to electromagnetic force. The solid part of the third stator lamination 30 can disperse the contact stress between the first stator lamination 10 and the second stator lamination 20, avoid stress concentration at the edge of the first concave area 11, and improve the fatigue resistance of the overall stacked structure.

[0071] The first concave region 11 has a longer arc length (larger main oil passage cross-section), while the second concave region 31 has a shorter arc length (smaller transition section cross-section), forming a gradually narrowing channel. When oil flows from the main oil passage of the first concave region 11 into the second concave region 31 of the third stator lamination 30, the local reduction in cross-section will cause moderate throttling, increasing the oil pressure and making it easier to evenly distribute the oil to the first oil hole 21 of the second stator lamination 20, avoiding insufficient local oil supply due to insufficient pressure.

[0072] After the arc length of the second concave region 31 is shortened relative to the arc length of the first concave region 11, its circumferential position can be more accurately aligned with the first oil hole 21 of the second stator lamination 20, guiding the oil from the main oil channel through the second concave region 31 into the first oil hole 21, reducing oil leakage or eddy current loss in the transition section, and improving cooling efficiency.

[0073] Reference Figure 14 , Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in the embodiment of this application. The third stator lamination 30 also includes a second oil hole 32, which is connected to the oil channel formed by the first recess 11 to receive oil from the first recess 11.

[0074] The second oil hole 32 is connected to the first oil hole 21 so that the oil passes through the first concave area 11, enters the first oil hole 21 through the second oil hole 32, and is sprayed.

[0075] In this embodiment, refer to Figure 5 , Figure 5This is a three-dimensional structural diagram of another stator lamination provided in an embodiment of this application. The second recess 31 of the third stator lamination 30, which is adjacent to the first stator lamination 10, is connected to the corresponding first recess 11 of the first stator lamination 10.

[0076] The first recess 11 of the first stator lamination 10 forms the main oil channel of the intermediate stacking section, and the second recess 31 of the third stator lamination 30 serves as a transition channel. After the two are connected, the oil can flow smoothly from the main oil channel into the second recess 31, and then enter the first oil hole 21 through the cooperation of the third stator lamination 30 and the second stator lamination 20. This realizes the continuous delivery of oil from the intermediate stacking section to the end, avoids the situation of flow blockage or leakage of oil between the first and third stator laminations 30, and ensures that the oil can fully cover the area that needs to be cooled.

[0077] In some possible implementations, refer to Figure 6 , Figure 6 This is a schematic diagram of another stator lamination provided in an embodiment of this application. The stator lamination 1 further includes a fourth stator lamination 40, which is disposed between the second stator lamination 20 and the third stator lamination 30. The outer periphery of the fourth stator lamination 40 is circular. That is, the fourth stator lamination 40 has no recessed area.

[0078] The fourth stator lamination 40 is provided with a third oil hole 41. The minimum distance between the third oil hole 41 and the center is different from the minimum distance between the first oil hole 21 and the center.

[0079] It can be known that the minimum distance mentioned above is the minimum straight-line distance between the oil hole and the center of the circle.

[0080] Alternatively, in some embodiments, the diameters of the first oil hole 21 and the third oil hole 41 are different.

[0081] It should be noted that the outer periphery of both the fourth stator lamination 40 and the second stator lamination 20 is circular.

[0082] Refer to 13 and Figure 15 , Figure 13 This is a schematic diagram of the structure of the second stator lamination provided in an embodiment of this application. Figure 15 This is a schematic diagram of the structure of the fourth stator lamination provided in the embodiment of this application. The outer circles of the second stator lamination 20 and the fourth stator lamination 40 have grooves, which are process mark grooves, mainly used to check whether the stator rotation is correct.

[0083] Therefore, the outer contours of the second stator lamination 20 and the fourth stator lamination 40 being complete circles or having the aforementioned process mark grooves are both within the scope of the circular outer contours of the second stator lamination 20 and the fourth stator lamination 40 disclosed in the embodiments of this application.

[0084] By setting a fourth stator lamination 40 on the third stator lamination 30 and the second stator lamination 20, and setting the outer peripheral surface of the fourth stator lamination 40 to a circumferentially continuous and flat structure, a rigid transition support surface can be formed, which can provide stable support for the second stator lamination 20. This support effectively constrains the deformation tendency of the second stator lamination 20. When the second stator lamination 20 is subjected to stress and tends to warp, the fourth stator lamination 40 can constrain its deformation through surface contact, prevent warping, and ensure the stability of the end structure.

[0085] Reference Figure 15 , Figure 7 , Figure 15 This is a schematic diagram of the structure of the fourth stator lamination provided in an embodiment of this application. Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment. The fourth stator lamination 40 includes a third oil hole 41, which is connected to the second recess 31 to form an oil transport path of the first recess 11, the second recess 31, the second oil hole 32, the third oil hole 41, and the first oil hole 21.

[0086] In some possible implementations, refer to Figure 8 , Figure 9 , Figure 8 This is a schematic diagram of another stator lamination provided in an embodiment of this application. Figure 9 This is a schematic diagram of another stator lamination provided in an embodiment of this application. The stator lamination 1 includes a fourth stator lamination 40, which is disposed between the first stator lamination 10 and the second stator lamination 20. The outer circumference of the fourth stator lamination 40 is continuously flat. That is, the fourth stator lamination 40 has no recessed areas.

[0087] By setting a fourth stator lamination 40 on the first stator lamination 10 and the second stator lamination 20, and setting the outer peripheral surface of the fourth stator lamination 40 to a circumferentially continuous and flat structure, a rigid transition support surface can be formed, which can provide stable support for the second stator lamination 20. This support effectively constrains the deformation tendency of the second stator lamination 20. When the second stator lamination 20 is subjected to stress and tends to warp, the fourth stator lamination 40 can constrain its deformation through surface contact, prevent warping, and ensure the stability of the end structure.

[0088] Reference Figure 15 , Figure 9 , Figure 15 This is a schematic diagram of the structure of the fourth stator lamination provided in an embodiment of this application. Figure 9 This is a schematic diagram of another stator lamination provided in an embodiment of this application. The fourth stator lamination 40 includes a third oil hole 41, which is connected to the first recess 11 to form an oil transmission path between the first recess 11, the third oil hole 41, and the first oil hole 21.

[0089] In some possible implementations, the stack height of the intermediate stacking section accounts for 5%-30% of the total stack height of the stator lamination 1.

[0090] When the stack height of the intermediate stacking section accounts for more than 30% of the total stack height, the concave area of ​​the first stator lamination 10 is large, the contact area between the first stator lamination 10 and the housing 2 is small, and the torque transmission requirement between the stator lamination 1 and the housing 2 cannot be guaranteed.

[0091] When the stack height of the intermediate stacking section accounts for less than 5% of the total stack height, the oil pressure in the oil passage of stator lamination 1 becomes too high, resulting in poor uniformity.

[0092] In some possible implementations, refer to Figure 12 , Figure 12 This is a schematic diagram of another first stator lamination provided in an embodiment of this application. A boss 12 is provided on the outer periphery of the first stator lamination 10. The boss 12 is located in the first recess 11. The boss 12 is configured to be used to place adhesive to achieve bonding between the first stator laminations 10.

[0093] The height of the boss 12 is 0.1-0.9 times the difference in outer diameter between the first concave area 11 and the convex area of ​​the first stator lamination 10. The height of the boss 12 is less than the height of the convex area of ​​the first stator lamination 10.

[0094] The first stator laminations 10 are axially bonded together using a dispensing process to ensure the structural stability after stacking.

[0095] In this embodiment, the stator lamination 1 cannot be welded to its outer circumference. When using a dispensing method... Figure 11 The outer circumference of the first stator lamination 10 shown has only a few solid areas where glue can be applied, which may result in a less secure bond when the outer diameter of the stator lamination 1 is large.

[0096] Figure 12 This is a schematic diagram of the structure of another first stator lamination provided in an embodiment of this application. Figure 12 The first stator lamination 10 shown has a boss 12 added at the first recess 11 position to provide a solid for dispensing adhesive and enhance structural strength.

[0097] In some embodiments, two bosses 12 are provided within the same first recessed area 11. It should be noted that the arrangement of the bosses 12 will affect the oil pressure, and those skilled in the art can set different numbers of bosses 12 according to the application scenario.

[0098] Those skilled in the art can select according to different application scenarios. Figure 11 or Figure 12 The structure of the first stator lamination 10 in the middle.

[0099] In some possible implementations, the stator laminations 1 are stacked by segmented welding, dispensing, self-adhesive sheets, and integral injection molding.

[0100] Segmented welding involves setting welding points in specific areas of the stator lamination 1 (exemplary, the outer edge of the outer circle, the outside of the slot), and performing local welding along the axial direction at certain intervals to form a segmented rigid connection of the stator lamination 1.

[0101] Dispensing and stacking involves applying a specific adhesive to the contact surfaces (typically the outer edge or the bottom of the inner groove) of the stator laminations 1, and then bonding the laminations together through pressing and curing. For example, the adhesive is set as epoxy resin.

[0102] Self-adhesive sheet stacking utilizes a pre-coated self-adhesive layer on the surface of the sheet. During the stacking process, heating or pressurizing melts and solidifies the coating, forming an overall bond.

[0103] Integral injection molding stacking involves placing the stacked stator laminations 1 into a special mold, and then injecting molten plastic into the gaps between the laminations and the preset injection channels using an injection molding machine. After solidification, it forms an encapsulated connection.

[0104] Reference Figure 7 , Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment. The first stator lamination 10 is stacked along the axial direction to form multiple sets of intermediate stacked sections. The recessed area of ​​the intermediate stacked section is composed of the first recessed area 11 of the first stator lamination 10 that makes up the intermediate stacked section.

[0105] Figure 7 The number of intermediate stacked segments relative to Figure 6 The middle stacking segment is set to twice the size.

[0106] Along the axial direction of the stator lamination 1, the second set of intermediate stacked sections rotates by a set angle relative to the first set of intermediate stacked sections in the first direction; the third set of intermediate stacked sections rotates by the same set angle relative to the second set of intermediate stacked sections in the first direction; the fourth set of intermediate stacked sections 10 does not rotate relative to the third set of intermediate stacked sections; the fifth set of intermediate stacked sections rotates by the same set angle relative to the fourth set of intermediate stacked sections in the opposite direction to the first direction; and the sixth set of intermediate stacked sections rotates by the same set angle relative to the fifth set of intermediate stacked sections in the opposite direction to the first direction.

[0107] Reference Figure 10 , Figure 10 This is a schematic diagram of another stator lamination provided in an embodiment of this application. Figure 10 The number of intermediate stacked segments relative to Figure 9 The middle stacking segment is set to twice the size.

[0108] Along the axial direction of stator lamination 1, the second set of intermediate stacked sections rotates by a set angle relative to the first set of intermediate stacked sections in the first direction; the third set of intermediate stacked sections rotates by the same set angle relative to the second set of intermediate stacked sections in the first direction; the fourth set of intermediate stacked sections does not rotate relative to the third set of intermediate stacked sections; the fifth set of intermediate stacked sections rotates by the same set angle relative to the fourth set of intermediate stacked sections in the opposite direction to the first direction; and the sixth set of intermediate stacked sections rotates by the same set angle relative to the fifth set of intermediate stacked sections in the opposite direction to the first direction.

[0109] The rotating stacking arrangement of the first stator lamination 10 (which cycles according to the pattern of "forward rotation, forward rotation, no rotation, reverse rotation, reverse rotation") balances the directional loss of the magnetic circuit, disperses structural stress, optimizes the oil flow path, and suppresses resonance and noise through the periodic design of angle changes.

[0110] In some possible implementations, refer to Figure 7 , Figure 10 As shown, Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment. Figure 10 This is a schematic diagram of another stator lamination provided in an embodiment of this application.

[0111] Along the axial direction of stator lamination 1, adjacent intermediate stacked sections are rotated at a certain angle around the axial central axis in the first direction, and the total height of the first stator lamination 10 at different rotation angles is the same.

[0112] The statement above, that the total height of the first stator laminations 10 at each rotation angle is the same in the axial direction, means that in the intermediate stacking section formed by stacking multiple first stator laminations 10, the total height (i.e., the sum of the thickness) of all the first stator laminations 10 at the same rotation angle is equal in the axial direction.

[0113] By setting the total height of the first stator lamination 10 at each rotation angle in all intermediate stacked sections to be the same, the axial force on the overall structure is balanced, preventing the warping of the second stator lamination 20 caused by the deformation of the intermediate section to the end, thus forming a global anti-deformation capability.

[0114] By utilizing the stator slots 101 evenly distributed on the inner circumference of the stator lamination 1 and the symmetrical concave area distribution on the outer circumference in synergy, magnetic circuit distortion is reduced, making the air gap magnetic field closer to a sine wave, reducing harmonic losses, improving motor efficiency, and enhancing magnetic field uniformity.

[0115] The symmetrical design and axial height balance of the intermediate stacking section reduce electromagnetic force pulsation during motor operation, thus reducing vibration and noise; the tight fit between the housing 2 and the stator lamination 1 further enhances the overall rigidity and adapts to high-speed operating conditions.

[0116] During motor operation, the air gap magnetic field between the stator and rotor assemblies generates periodically changing electromagnetic forces. If the intermediate stacked sections suffer from structural asymmetry due to inconsistent lamination heights, this asymmetry will cause differences in the radial component of the electromagnetic force's circumferential distribution, creating an eccentric force (i.e., additional torque) around the axial central axis. This eccentric force causes periodic radial vibration in the stator assembly. This vibration not only accelerates bearing wear and shortens motor lifespan but also generates high-frequency noise, affecting the motor's operational quality.

[0117] In this embodiment, the first stator laminations 10 at each rotation angle have the same height, ensuring that the mass distribution and structural stiffness of the intermediate stacked section are uniform and symmetrical in all circumferential directions. This allows the radial components of the electromagnetic force to be balanced, effectively counteracting the generation of eccentric forces. Simultaneously, the uniform axial force reduces air gap unevenness caused by local deformation of the stator core, preventing air gap deviation from further amplifying the asymmetry of the electromagnetic force. This creates a virtuous cycle of "structural symmetry—force balance—eccentric force suppression," significantly improving the stability and reliability of the motor operation.

[0118] In the stator assembly proposed in this application, the housing 2 does not have an annular oil channel inside. The outer circumferential surface of the first stator lamination 10 has a first recess 11 distributed therein, and the first recesses 11 of adjacent first stator laminations 10 are interconnected in the circumferential direction to form a continuous oil channel on the outer periphery of the intermediate stacking section. The second stator lamination 20 is provided with a first oil hole 21, which is connected to the oil channel. By setting the oil channel formed by the interconnected first recesses 11, the oil can directly enter the stator lamination 1 through the oil channel without the need for diversion or transfer through the annular oil channel of the housing 2, reducing heat loss of the oil during the transmission process and improving the cooling response speed.

[0119] This application provides an electric motor, which includes a stator assembly and a rotor assembly. The stator assembly is sleeved around the rotor assembly, and a uniform air gap is formed between the two. Energy conversion is achieved through electromagnetic induction.

[0120] It should be noted that the stator assembly may include a stator core and stator windings. The stator windings are wound in the stator slots 101 of the stator core to form a multi-layer winding structure. The specific structure of the stator core in the stator assembly can be referred to the above embodiments. Contents that are the same as or similar to those in the above embodiments can be referred to the above description and will not be repeated hereafter.

[0121] Based on this, the rotor assembly includes a rotor core and a shaft;

[0122] The rotor core includes at least two rotor core segments distributed along the axial direction, and the stator core includes at least two stator core segments distributed along the axial direction. The number of rotor core segments is greater than or equal to the number of stator core segments.

[0123] Understandably, the rotor core can be made of stacked silicon steel sheets.

[0124] The motor provided in this application adopts all the technical solutions of all the above-described stator assembly embodiments, and therefore has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here.

[0125] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the stator assembly or motor of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0126] The above are only some embodiments of this application and do not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A stator assembly, characterized in that, It includes at least a housing and stator laminations stacked sequentially along an axial direction, the housing being configured to mount the stator laminations, the stator laminations comprising: The first stator lamination has a first recessed area distributed circumferentially on its outer peripheral surface. Multiple first stator laminations form an intermediate stacked section. The first recessed areas of adjacent first stator laminations are interconnected circumferentially to form a continuous oil passage on the outer periphery of the intermediate stacked section. The second stator lamination is disposed at the axial end of the intermediate stacking section, and the second stator lamination is provided with a first oil hole, which is connected to the oil passage.

2. The stator assembly according to claim 1, characterized in that, The stator lamination further includes a third stator lamination, which is disposed between the first stator lamination and the second stator lamination, and the outer circumferential surface of the third stator lamination has a second concave area distributed therein; The arc length of the second concave region is less than the arc length of the first concave region.

3. The stator assembly according to claim 2, characterized in that, The second recess of the third stator lamination adjacent to the first stator lamination is connected to the corresponding first recess of the first stator lamination.

4. The stator assembly according to claim 1, characterized in that, The stator lamination further includes a fourth stator lamination, which is disposed between the first stator lamination and the second stator lamination, and the outer periphery of the fourth stator lamination is circular. The fourth stator lamination is provided with a third oil hole. The minimum distance between the third oil hole and the center of the circle is different from the minimum distance between the first oil hole and the center of the circle, or the diameters of the first oil hole and the third oil hole are different.

5. The stator assembly according to claim 2 or 3, characterized in that, The stator lamination also includes a fourth stator lamination, which is disposed between the second stator lamination and the third stator lamination, and the outer periphery of the fourth stator lamination is circular.

6. The stator assembly according to any one of claims 1-4, characterized in that, The stacking height of the intermediate stacking section accounts for 5%-30% of the total stacking height of the stator laminations.

7. The stator assembly according to claim 1, characterized in that, A boss is provided on the outer periphery of the first stator lamination. The boss is located in the first recessed area and is configured to be used for dispensing adhesive to achieve bonding between the first stator laminations.

8. The stator assembly according to any one of claims 1-4, characterized in that, The stator laminations are stacked and formed by segmented welding, self-adhesive sheets, or integral injection molding.

9. The stator assembly according to any one of claims 1-4, characterized in that, Multiple first stator laminations are stacked along the axial direction to form multiple sets of intermediate stacked sections. Along the axial direction of the stator laminations, adjacent intermediate stacked sections are rotated by a certain angle around the axial central axis in a first direction. The total height of the first stator laminations at different rotation angles is the same.

10. An electric motor, characterized in that, It includes a stator assembly and a rotor assembly as described in any one of claims 1 to 8, wherein the stator assembly is sleeved around the rotor assembly.

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