Stator assembly and electric machine

Abstract

The embodiment of the application provides a kind of stator assembly and motor, the stator assembly includes the multiple stator lamination of sequentially laminated along the axial direction, and the inner periphery of stator lamination is uniformly distributed with stator slot, wherein, stator lamination includes first stator lamination, second stator lamination and third stator lamination, multiple first stator laminations constitute middle stack section, and the axial one end of which is equipped with second stator lamination, and the second stator lamination of same end is sequentially stacked along the circumferential direction, and third stator lamination is clamped between first stator lamination and second stator lamination, and the outer circular surface of first stator lamination is circumferentially distributed with first recess area, and the outer periphery profile of third stator lamination is circular, by increasing third stator lamination to provide support for second stator lamination, effectively constrain the deformation trend of second stator lamination, prevent second stator lamination from warping.

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] Currently, in the power systems used in new energy electric vehicles, the stator cores of the motors typically employ open-slot laminations. Stator cores composed of open-slot laminations can provide better electromagnetic performance.

[0003] In existing technology, the stator of a motor is usually connected to the housing (frame) with an interference fit. When a large torque is required, the interference fit must be increased, which increases the possibility of lamination warping and deformation in the open slot structure. If the lamination warps and scratches the copper wire, it can lead to accidents such as motor burnout and property damage. Utility Model Content

[0004] This application provides a stator assembly and a motor. By adding a lamination to the stator assembly, the problem of easy deformation of the oil-sprayed lamination during stator manufacturing and the warping of the end laminations when the stator assembly is installed in the housing are solved by adding a lamination to the stator assembly with only one additional stamping step.

[0005] In a first aspect, embodiments of this application provide a stator assembly, including a plurality of stator laminations stacked sequentially along an axial direction, wherein stator slots are uniformly distributed on the inner circumference of the stator laminations;

[0006] The stator lamination includes a first stator lamination, a second stator lamination, and a third stator lamination. Multiple first stator laminations form an intermediate stacking section. Second stator laminations are disposed at the axial end of the intermediate stacking section. Second stator laminations at the same end are stacked sequentially along the axial direction. The third stator lamination is sandwiched between the first stator laminations and the second stator laminations.

[0007] The outer circumferential surface of the first stator lamination has a uniformly distributed first concave area, and the outer circumferential outline of the third stator lamination is circular.

[0008] The second stator lamination has a second oil hole circumferentially through it, and the third stator lamination has a third oil hole circumferentially through it. The minimum distance between the third oil hole and the center of the circle is different from the minimum distance between the center of the second oil hole, or the diameter of the third oil hole is different from the diameter of the second oil hole.

[0009] In one possible embodiment, the stator assembly further includes a housing configured to mount stator laminations, and an annular oil passage is provided inside the housing, which communicates with a first recessed area so that oil can flow into the first recessed area through the annular oil passage.

[0010] The first stator lamination has a first oil hole circumferentially through it, the second stator lamination has a second oil hole circumferentially through it, and the third stator lamination has a third oil hole circumferentially through it.

[0011] In the axial direction of the stator assembly, part of the third oil hole is connected to the second oil hole and the first oil hole, and part of the third oil hole is connected to the first recessed area, so as to guide the oil in the first recessed area to the third oil hole.

[0012] In one possible implementation, in the circumferential direction, the minimum distance between the edge of the third oil hole communicating with the first recess and the edge of the first recess is greater than 0.2 mm.

[0013] This design allows the first and third stator laminations to be processed using a process of "first uniformly stamping the middle oil hole, and then stamping the first stator lamination a second time to form the first concave area", avoiding the processing defects caused by interference between the edge of the first concave area and the third oil hole during the first stamping.

[0014] In one possible implementation, each first stator lamination has a first recessed area evenly distributed along the circumferential direction on its outer peripheral surface. Multiple first stator laminations are stacked along the axial direction to form multiple sets of intermediate stacked sections. The first recessed areas of two adjacent sets of intermediate stacked sections are rotated by a certain angle around the axial central axis along a first direction to form a spiral recessed area layout on the outer periphery of the intermediate stacked sections.

[0015] In one possible implementation, each first stator lamination has a first recessed area evenly distributed along the circumferential direction on its outer peripheral surface. Multiple first stator laminations are stacked along the axial direction to form multiple sets of intermediate stacked sections. The first recessed areas of two adjacent sets of intermediate stacked sections are rotated by a certain angle around the axial central axis along the first direction, and then rotated by the same angle in the opposite direction of the first direction to form a circumferentially symmetrical distribution of recessed areas on the outer periphery of the intermediate stacked sections.

[0016] In one possible implementation, the rotation angle of two adjacent sets of intermediate stacked sections is adapted to the number of first recessed areas of the first stator lamination. Within a certain range, the smaller the rotation angle, the larger the number of first recessed areas.

[0017] In one possible implementation, the total height of the first stator laminations at each rotation angle is the same in the axial direction.

[0018] In one possible implementation, the distance between the center of the different second oil holes and the center of the second stator lamination is different.

[0019] In one possible implementation, the second oil hole is configured as a rectangle, circle, polygon, or irregular shape.

[0020] 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.

[0021] The stator assembly and motor provided in this application embodiment provide stable support for the second stator lamination by setting a third stator lamination on the first and second stator laminations and making the outer peripheral surface of the third stator lamination continuously flat along the circumferential direction. This support effectively constrains the deformation tendency of the second stator lamination. When the second stator lamination is subjected to stress and tends to warp, the third stator lamination can play a good suppressing effect and prevent warping. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the stator lamination structure in related technologies;

[0024] Figure 2 This is a schematic diagram of the stator lamination structure provided in the embodiments of this application;

[0025] Figure 3 A three-dimensional structural schematic diagram of the stator lamination provided in the embodiments of this application;

[0026] Figure 4 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0027] Figure 5 A three-dimensional structural schematic diagram of another stator lamination provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment;

[0030] Figure 8 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of another stator lamination provided in an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of the structure of the stator assembly provided in an embodiment of this application;

[0033] Figure 11 This is a schematic diagram of the structure of the first stator lamination provided in an embodiment of this application;

[0034] Figure 12 This is a schematic diagram of the structure of the second stator lamination provided in an embodiment of this application;

[0035] Figure 13 This is a schematic diagram of the structure of a second stator lamination provided in another embodiment of this application;

[0036] Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in an embodiment of this application;

[0037] Figure 15 A schematic diagram of the structure of the first stator lamination provided in an embodiment of this application from another perspective;

[0038] Figure 16 A partially enlarged view of the first stator lamination provided in an embodiment of this application;

[0039] Figure 17 Another enlarged view of the first stator lamination provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 1-Stator assembly; 10-First stator lamination; 20-Second stator lamination; 101-Stator slot;

[0042] 30 - Third stator lamination; 11 - First recessed area; 12 - First oil hole;

[0043] 21-Second oil hole; 31-Third oil hole; 40-Machine housing; 41-Annular oil passage;

[0044] 50 - Weld bead; 311 - First sub-oil hole; 312 - Second sub-oil hole.

[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] This application provides a stator assembly 1, which can be applied to motors, such as new energy vehicle motors and mechanical equipment motors, and is not limited thereto. Its core improvement lies in solving the end lamination warping problem by adding a third stator lamination 30.

[0050] Understandably, the motor includes a stator assembly 1 and a rotor assembly. The rotor assembly includes a rotor core and a shaft. The stator assembly 1 includes a stator core and stator windings.

[0051] The stator core of stator assembly 1 includes multiple stator laminations stacked sequentially along the axial direction. Stator slots 101 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-layer windings to adapt to different practical needs, which is not limited here.

[0052] In related technologies, refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a stator lamination in the related art. The stator lamination includes a first stator lamination 10 and a second stator lamination 20. Multiple first stator laminations 10 are configured, and these multiple first stator laminations 10 are tightly stacked along the axial direction to form an intermediate stacked section, which serves as the main structure of the stator assembly 1. Second stator laminations 20 are provided at both ends of the intermediate stacked section along the axial direction.

[0053] Since the second stator lamination 20 at the end may encroach on the electromagnetic space, resulting in a decrease in torque, the number of second stator laminations 20 is usually small and the stack height is low. Generally speaking, the stack height of the second stator laminations 20 at each end does not exceed 8mm. Multiple second stator laminations 20 at the same end are stacked sequentially along the axial direction to form an end structure.

[0054] Reference Figure 11 , Figure 11 This is a schematic diagram of the structure of the first stator lamination provided in the embodiment of this application. In order to reduce the types of laminations and the number of stamping stations, the first stator lamination 10 is usually partially open, that is, the outer circle of the first stator lamination 10 is not a complete circle, and a part of the area is smaller than the maximum outer diameter of the first stator lamination 10 to form a first recessed area 11. The first recessed area 11 is evenly distributed circumferentially along the outer circle surface of the first stator lamination 10. The first recessed area 11 is used to guide the flow of oil.

[0055] Stator laminations are prone to impact and deformation during mass production. The edge of the second stator lamination 20 may warp at the point where it overlaps with the first recess 11 of the first stator lamination 10 in the circumferential direction, which may lead to oil leakage.

[0056] Based on the above, referring to Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the stator lamination structure provided in an embodiment of this application. Figure 3 This is a three-dimensional structural diagram of the stator lamination provided in the embodiment of this application. The stator lamination includes a third stator lamination 30, which is sandwiched between the first stator lamination 10 and the second stator lamination 20. The outer periphery of the third stator lamination 30 is circular.

[0057] In other words, the outer peripheral surface of the third stator lamination 30 is continuously flat in the circumferential direction, or the third stator lamination 30 has no recessed areas.

[0058] It should be noted that the outer periphery of both the second stator lamination 20 and the third stator lamination 30 is circular.

[0059] Refer to 12 and Figure 14 , Figure 12 This is a schematic diagram of the structure of the second stator lamination provided in an embodiment of this application. Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in the embodiment of this application. The outer circles of the second stator lamination 20 and the third stator lamination 30 have grooves, which are process mark grooves, mainly used to check whether the stator rotation is correct.

[0060] Therefore, the outer contours of the second stator lamination 20 and the third stator lamination 30 being complete circles or having the aforementioned process marking grooves are both within the scope of the circular outer contours of the second stator lamination 20 and the third stator lamination 30 disclosed in the embodiments of this application.

[0061] By setting a third stator lamination 30 on the first stator lamination 10 and the second stator lamination 20, and setting the outer peripheral surface of the third stator lamination 30 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 third stator lamination 30 can constrain its deformation through surface contact, prevent warping, and ensure the stability of the end structure.

[0062] The third stator lamination 30 has a third oil hole 31 circumferentially through it, and the second stator lamination 20 has a second oil hole 21 circumferentially through it. The diameters of the second oil hole 21 and the third oil hole 31 are different.

[0063] The third stator lamination 30 and the second stator lamination 20 are concentrically arranged, and the minimum distance between the third oil hole 31 and the center is different from the minimum distance between the second oil hole 21 and the center.

[0064] The minimum distance is the minimum straight-line distance between the oil hole and the center of the circle.

[0065] Reference Figure 2 , Figure 2 This is a schematic diagram of the stator lamination structure provided in an embodiment of this application. In some embodiments, welding can be performed on the outer surface of the stator lamination to achieve the installation between the stator laminations. In some embodiments, welding may not be used between the stator laminations. For example, an adhesive dispensing process can be used to achieve axial bonding to ensure the structural stability after stacking.

[0066] In some possible implementations, the stator laminations may be mostly applied to the first stator lamination 10, with the third stator lamination 30 used only at the ends.

[0067] Reference Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the stator lamination structure provided in the embodiments of this application. Figure 3 This is a three-dimensional structural diagram of the stator lamination provided in an embodiment of this application. The stator lamination includes eleven first stator laminations 10, with second stator laminations 20 connected to both ends of each first stator lamination 10. A third stator lamination 30 is disposed between the first stator laminations 10 and the second stator laminations 20. Multiple weld beads 50 are arranged axially between the multiple laminations, and the multiple weld beads 50 are arranged circumferentially along the laminations.

[0068] In some implementations, the stator laminations may mostly use the third stator lamination 30, with the first stator lamination 10 used only at the oil inlet position.

[0069] Reference Figure 4and Figure 5 , Figure 4 This is a schematic diagram of the structure of another stator lamination provided in an embodiment of this application. Figure 5 This is a three-dimensional structural diagram of another stator lamination provided in an embodiment of this application. The stator lamination includes three first stator laminations 10, with second stator laminations 20 connected to both ends of the first stator laminations 10 respectively, and a plurality of third stator laminations 30 disposed between the first stator laminations 10 and the second stator laminations 20.

[0070] Reference Figure 14 , Figure 15 and Figure 16 , Figure 14 This is a schematic diagram of the structure of the third stator lamination provided in the embodiments of this application. Figure 15 This is a structural schematic diagram of the first stator lamination provided in an embodiment of this application from another perspective. Figure 16 This is a partial enlarged view of the first stator lamination provided in the embodiment of this application. The third stator lamination 30 is provided with a plurality of third oil holes 31 in the circumferential direction. The third oil holes 31 include a first sub-oil hole 311 and a second sub-oil hole 312. The first sub-oil hole 311 is connected to the first oil hole 12 and the second oil hole 21. The second sub-oil hole 312 is correspondingly provided with the first recessed area 11.

[0071] In some possible implementations, refer to Figure 10 , Figure 10 This is a schematic diagram of the stator assembly provided in an embodiment of this application. The stator assembly 1 also includes a housing 40, which is configured to mount stator laminations. The internal contour of the housing 40 is adapted to the outer periphery of the stator laminations to fix the entire stator assembly.

[0072] The housing 40 has an annular oil passage 41 inside, which is connected to the first recessed area 11 so that oil can flow into the first recessed area 11 through the annular oil passage 41 to form a preliminary heat dissipation path.

[0073] In order to achieve axial circulation of oil, the first stator lamination 10 is provided with a first oil hole 12 through the circumference, the second stator lamination 20 is provided with a second oil hole 21 through the circumference, and the third stator lamination 30 is provided with a third oil hole 31 through the circumference.

[0074] In the axial direction of the stator assembly 1, a portion of the third oil hole 31 is aligned and connected with the second oil hole 21 and the first oil hole 12 to form an axially continuous main oil channel. A portion of the third oil hole 31 is directly connected to the first recessed area 11 to guide the oil in the first recessed area 11 to the third oil hole 31, and then flows through the axial main oil channel formed by the first sub-oil hole 311 and the first oil hole 12 / second oil hole 21, finally spraying and cooling the stator winding coil, forming a complete cycle of "annular oil channel 41 → first recessed area 11 → third oil hole 31 → main oil channel → winding".

[0075] In one possible implementation, refer to Figure 6 , Figure 6 This is a schematic diagram of another stator lamination provided in an embodiment of this application.

[0076] Each first stator lamination 10 has a first recess 11 evenly distributed along the circumferential direction on its outer peripheral surface, and multiple first stator laminations 10 are stacked along the axial direction to form multiple sets of intermediate stacked sections. Figure 6 The first recess 11 of the middle stacked section is composed of the first recess 11 of a plurality of first stator laminations 10.

[0077] The first recess 11 of two adjacent sets of intermediate stacked sections are rotated sequentially around the axial central axis along a first direction by a certain angle to form a spiral recess layout on the outer periphery of the stator lamination. It should be noted that the first direction is... Figure 6 The direction indicated by X in the middle.

[0078] Reference Figure 6 , Figure 6 This is a schematic diagram of another stator lamination provided in an embodiment of this application. Figure 6 The structure of the middle stator lamination is as follows Figure 2 The structure of the middle stator lamination is obtained by rotation. Along the axial direction of the stator assembly 1, the second intermediate stacked segment is rotated 60° relative to the first intermediate stacked segment in the first direction, the third intermediate stacked segment is rotated 60° relative to the second intermediate stacked segment in the first direction, the fourth intermediate stacked segment is rotated 60° relative to the third intermediate stacked segment in the first direction, the fifth intermediate stacked segment is rotated 60° relative to the fourth intermediate stacked segment in the first direction, and the sixth intermediate stacked segment is rotated 60° relative to the fifth intermediate stacked segment in the first direction.

[0079] Reference Figure 7 , Figure 7 This is a schematic diagram of another stator lamination provided in this embodiment. Figure 7 The structure of the middle stator lamination is as follows Figure 4 The structure of the middle stator lamination is obtained by rotation. Along the axial direction of stator assembly 1, the second intermediate stacked section is rotated 120° relative to the first intermediate stacked section in the first direction, and the third intermediate stacked section is rotated 120° relative to the second intermediate stacked section in the first direction.

[0080] It should be noted that the first recess 11 of the two adjacent intermediate stacked sections rotates by a certain angle around the axial central axis in the opposite direction of the first direction to form a spiral recess layout on the outer periphery of the intermediate stacked section, which can accommodate different numbers of recesses.

[0081] In one possible implementation, refer to Figure 8 , Figure 8This is a schematic diagram of another stator lamination provided in an embodiment of this application. Each first stator lamination 10 has a first recessed area 11 evenly distributed along the circumferential direction on its outer peripheral surface. Multiple first stator laminations 10 are stacked and installed along the axial direction to form multiple sets of intermediate stacked sections. Figure 8 The first recess 11 of the middle stacked section is composed of the first recess 11 of a plurality of first stator laminations 10.

[0082] After the first concave area 11 of two adjacent intermediate stacked sections is rotated by a certain angle around the axial central axis along the first direction, it is then rotated by the same angle in the opposite direction of the first direction to form a circumferentially symmetrical concave area distribution on the outer periphery of the intermediate stacked section.

[0083] The circumferentially symmetrical concave area distribution of the intermediate stacking section, in conjunction with the annular oil passage 41 of the housing 40, ensures that the oil is evenly distributed circumferentially, avoids local oil stagnation, and improves heat dissipation efficiency. The periodic layout of forward and reverse rotation can also form a spiral oil flow path, extending the heat exchange time between the oil and the stator laminations.

[0084] Reference Figure 8 , Figure 8 This is a schematic diagram of another stator lamination provided in an embodiment of this application. Figure 8 The structure of the middle stator lamination is as follows Figure 2 The structure of the middle stator lamination is obtained by rotation. Along the axial direction of the stator assembly 1, adjacent intermediate stacked segments are first rotated and stacked along a first direction, and then rotated and stacked in the opposite direction of the first direction.

[0085] Reference Figure 9 , Figure 9 This is a schematic diagram of another stator lamination provided in an embodiment of this application. Figure 9 The structure of the middle stator lamination is as follows Figure 4 The structure of the middle stator lamination is obtained by rotation. Along the axial direction of the stator assembly 1, adjacent intermediate stacked segments are first rotated and stacked along a first direction, and then rotated and stacked in the opposite direction of the first direction.

[0086] In one possible implementation, the rotation angle between two adjacent sets of intermediate stacked sections is adapted to the number of first recessed areas 11 of the first stator lamination 10. Within a certain range, the smaller the rotation angle, the larger the number of first recessed areas 11.

[0087] In one possible implementation, the total height of the first stator laminations 10 at each rotation angle is the same in the axial direction to ensure uniform axial force on the intermediate stacked sections.

[0088] 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.

[0089] By setting the total height of the first stator lamination 10 at each rotation angle in the intermediate stacking section to be the same, the axial force of the overall structure is balanced, avoiding the warping of the second stator lamination 20 caused by the deformation of the intermediate section transmitted to the end, thus forming a global anti-deformation capability.

[0090] By utilizing the stator slots 101 that are evenly distributed on the inner circumference of the stator laminations and the symmetrical concave areas 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.

[0091] 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 40 and the stator laminations further enhances the overall rigidity, making it suitable for high-speed operation.

[0092] During motor operation, the air gap magnetic field between the stator assembly 1 and the rotor assembly generates a periodically changing electromagnetic force. If the intermediate stacked section suffers from structural asymmetry due to inconsistent lamination heights, this asymmetry will cause differences in the circumferential distribution of the radial component of the electromagnetic force, forming an eccentric force (i.e., additional torque) around the axial central axis. This eccentric force will cause the stator assembly to produce periodic radial vibrations. These vibrations will not only accelerate bearing wear and shorten the motor's service life, but also generate high-frequency noise, affecting the motor's operating quality.

[0093] 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.

[0094] In one possible implementation, this is to adapt to the pressurization process. (See reference...) Figure 17 , Figure 17This is another partially enlarged view of the first stator lamination provided in an embodiment of this application. In the circumferential direction, the minimum distance 'a' between the edge of the third oil hole 31, which communicates with the first recess 11, and the edge of the first recess 11 is greater than 0.2 mm. This ensures that the two types of laminations can first fill the intermediate oil groove during stamping, and then form the recess on the required lamination during a second stamping. This adds one stamping action, but does not increase the number of stamping stations or the length of the die.

[0095] The outer peripheral surface of the first stator lamination 10 is provided with a first recess 11, and the outer peripheral surface of the third stator lamination 30 is positioned corresponding to the first recess 11, maintaining a continuous and flat outer circular contour. This provides circumferential closure for the first recess 11 of the first stator lamination 10, preventing oil leakage from the mating gap between the third stator lamination 30 and the first stator lamination 10 during flow, ensuring the integrity of the support surface of the third stator lamination 30 for the second stator laminations 20 at both ends, and enhancing structural rigidity.

[0096] Stator laminations typically employ a process where oil grooves are first uniformly stamped, followed by a secondary stamping of recessed areas on the first stator lamination 10. If the distance between the edge of the third oil hole 31 and the edge of the first recessed area 11 is too close, the secondary stamping of the recessed area may cause interference between the edge of the recessed area of ​​the first stator lamination 10 and the edge of the third oil hole 31 of the third stator lamination 30, resulting in burrs, deformation, or material tearing. Sufficient spacing ensures that the first recessed area 11 of the first stator lamination 10 and the third oil hole 31 of the third stator lamination 30 are structurally independent, preventing cracks in the oil groove due to stamping stress in the recessed area, while also ensuring the sealing of the recessed area.

[0097] In one possible implementation, refer to Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of the structure of the second stator lamination provided in the embodiments of this application. Figure 13 This is a schematic diagram of the structure of the second stator lamination provided in another embodiment of this application. The distance between the center of the different second oil holes 21 and the center of the second stator lamination 20 is different.

[0098] The distances between the second oil holes 21 and the center of the second stator lamination 20 are different (i.e., they are distributed on different radial circumferences), and the cross-section of the second oil holes 21 is set to a rectangular, circular, polygonal or irregular shape to adapt to the complex oil diversion requirements at the end.

[0099] In one possible implementation, refer to Figure 12 and Figure 13 , Figure 12 This is a schematic diagram of the structure of the second stator lamination provided in the embodiments of this application. Figure 13 This is a schematic diagram of the structure of the second stator lamination provided in another embodiment of this application. The second oil hole 21 is set as a rectangular or irregular shape.

[0100] The radially differentiated distribution of the second oil hole 21 (different distances from the center) enables the layered flow of oil at the end. Combined with rectangular, circular, polygonal, or irregularly shaped channel structures, it can adapt to different flow requirements. The precise connection between the third oil hole 31 and the first recess 11 and the first / second oil hole 21 ensures seamless connection of oil in the axial and circumferential directions, reducing pressure drop loss.

[0101] Reference Figure 12 , Figure 12 This is a schematic diagram of the structure of the second stator lamination provided in an embodiment of this application. The second oil hole 21 is set as a rectangular hole with different heights from the center. In actual production, in order to ensure that the oil passage of the finished product is not blocked, an airtightness test process needs to be added during the production process.

[0102] The second stator lamination 20 has oil holes at various locations and heights, but only some of these holes are actually connected to the internal oil passages. Therefore, during airtightness testing, it is necessary to identify the oil holes at different locations. Because of their similar shapes, this process is quite complex and prone to errors.

[0103] To address the aforementioned issues, different distinguishing features are added to the second oil hole 21. (Refer to...) Figure 13 As shown, different additional features are added to the second oil hole 21 at various locations. These features do not affect oil pressure or injection performance. Oil holes requiring inspection can be quickly identified during airtightness testing.

[0104] Furthermore, during the stamping process, the positional accuracy between the oil holes cannot be set to 0, meaning that the positional relationship between the oil holes deviates to a certain extent from the ideal design.

[0105] Therefore, the radial and circumferential offsets between oil holes need to be considered during the design process. The radial offset needs to be calculated through simulation, while the circumferential offset can be achieved by appropriately increasing the width of certain oil holes so that the overlap width remains at the design value after the oil holes are offset.

[0106] The stator assembly 1 proposed in this application embodiment, by adding a new lamination form, ensures that oil can enter the internal cooling oil channel of the stator lamination from the axial center region of the stator assembly 1 with only one additional stamping step, and after filling the internal oil channel along the circumferential direction, it forms a confluence and sprays cooling to the stator winding coil.

[0107] This application provides an electric motor, which includes a stator assembly 1 and a rotor assembly. The stator assembly 1 is sleeved on the periphery of the rotor assembly, and a uniform air gap is formed between the two. Energy conversion is achieved through electromagnetic induction.

[0108] It should be noted that the stator assembly 1 may include a stator core and a stator winding. The stator winding is 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 1 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.

[0109] Based on this, the rotor assembly includes a rotor core and a shaft;

[0110] 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.

[0111] Understandably, the rotor core can be made of stacked silicon steel sheets.

[0112] In this embodiment, taking the number of rotor core segments as the same as the number of stator core segments as an example, the rotor core of the motor may include four rotor core segments distributed along the axial direction, and the stator core correspondingly includes four stator core segments distributed along the axial direction. The number of rotor core segments and stator core segments is the same, which is four.

[0113] By adopting a process design of "unified stamping + secondary forming", the processing difficulty of complex stampings is reduced and the consistency of mass production is improved. The number of end stampings is small and the structure is simple, which facilitates quality inspection and rework during assembly and reduces production costs.

[0114] The motor provided in this application adopts all the technical solutions of all embodiments of the stator assembly 1 described above, 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.

[0115] 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.

[0116] 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, The stator includes multiple stator laminations stacked sequentially along the axial direction, wherein stator slots (101) are uniformly distributed on the inner circumference of each stator lamination, and the stator laminations include: The first stator lamination has a first recessed area (11) evenly distributed on its outer peripheral surface, and multiple first stator laminations (10) form an intermediate stacked section; The second stator lamination (20) is disposed at the axial end of the intermediate stacking section, and the second stator laminations (20) at the same end are stacked sequentially in the circumferential direction; the second stator lamination (20) is provided with a second oil hole (21) in the circumferential direction. The third stator lamination (30) is sandwiched between the first stator lamination (10) and the second stator lamination (20), and the outer periphery of the third stator lamination (30) is circular; The third stator lamination (30) is provided with a third oil hole (31) circumferentially. The minimum distance between the third oil hole (31) and the center of the circle is different from the minimum distance between the second oil hole (21) and the center of the circle, or the diameter of the third oil hole (31) is different from the diameter of the second oil hole (21).

2. The stator assembly according to claim 1, characterized in that, It also includes a housing (40) configured to mount the stator laminations, and an annular oil passage (41) is provided inside the housing (40). The annular oil passage (41) communicates with the first recess (11) so that oil flows from the annular oil passage (41) into the first recess (11). The first stator lamination (10) is provided with a first oil hole (12) through the circumference, the second stator lamination (20) is provided with a second oil hole (21) through the circumference, and the third stator lamination (30) is provided with a third oil hole (31) through the circumference. In the axial direction of the stator assembly, part of the third oil hole (31) is connected to the first oil hole (12) and the second oil hole (21), and part of the third oil hole (31) is connected to the first recessed area, so that oil flows from the first recessed area (11) into the third oil hole (31).

3. The stator assembly according to claim 2, characterized in that, In the circumferential direction, the minimum distance between the edge of the third oil hole (31) that communicates with the first recess (11) and the edge of the first recess (11) is greater than 0.2 mm.

4. The stator assembly according to any one of claims 1-3, characterized in that, Each of the first stator laminations (10) has a first recess (11) evenly distributed along the circumferential direction on its outer peripheral surface. Multiple first stator laminations (10) are stacked along the axial direction to form multiple sets of intermediate stacking sections. The first recess (11) of two adjacent sets of intermediate stacking sections are rotated by a certain angle around the axial central axis along the first direction to form a spiral recess layout on the outer periphery of the intermediate stacking section.

5. The stator assembly according to any one of claims 1-3, characterized in that, Each of the first stator laminations (10) has a first recess (11) evenly distributed along the circumferential direction on its outer peripheral surface. Multiple first stator laminations (10) are stacked along the axial direction to form multiple sets of intermediate stacking sections. The first recess (11) of two adjacent sets of intermediate stacking sections are rotated by a certain angle along the first direction around the axial central axis, and then rotated by the same angle in the opposite direction of the first direction to form a circumferentially symmetrical recess distribution on the outer periphery of the intermediate stacking section.

6. The stator assembly according to claim 4, characterized in that, The rotation angle of the two adjacent sets of intermediate stacked sections is adapted to the number of the first recesses (11) of the first stator lamination (10). Within a certain range, the smaller the rotation angle, the larger the number of the first recesses (11).

7. The stator assembly according to claim 4, characterized in that, In the axial direction, the total height of the first stator lamination (10) at each rotation angle is the same.

8. The stator assembly according to any one of claims 1-3, characterized in that, The distance between the centers of the second oil hole (21) and the second stator lamination (20) is different.

9. The stator assembly according to claim 8, characterized in that, The second oil hole (21) is set to a rectangular, circular, polygonal or irregular shape.

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.

Images