Stator assembly and electric motor

Abstract

Disclosed in the present invention are a stator assembly and an electric motor. The stator assembly comprises a mounting plate, iron core segments and slot wedge segments, wherein the mounting plate is provided with a plurality of mounting holes, a support rib being defined between every two circumferentially adjacent mounting holes; the plurality of iron core segments are inserted into the plurality of mounting holes on a one-to-one basis, and are in limiting fit with the circumferentially adjacent slot wedge segments; and each slot wedge segment is stacked on the outer side of the corresponding support rib. In the present invention, the stator assembly is formed by mutual engagement of the iron core segments, slot wedge segments and mounting plate, effectively enhancing the overall structural strength and stability. In addition, there is no need for an external covering or adhesive on the magnetic surfaces of the iron core segments facing an air gap, enabling a smaller effective air gap of the electric motor, and thereby facilitating an improvement to the performance of the electric motor.

Description

Stator assembly and motor Technical Field

[0001] This invention relates to the field of motor technology, specifically to a stator assembly and a motor. Background Technology

[0002] Axial field motors (also known as disc motors) have advantages such as compact structure, light weight, high torque density, short axial dimension, and high power density, and are widely used in many fields. However, the stator structure of axial field motors currently has many problems.

[0003] Existing axial magnetic field motors consist of multiple stator cores. To assemble these cores into a single unit, adhesives are typically used to bond the cores to adjacent connectors during the stator assembly process. This structure has the following drawbacks: Firstly, the adhesive force of the adhesive is required to directly fix multiple cores, compromising the overall strength and reliability of the stator structure. Secondly, a covering or adhesive layer needs to be added to the magnetically conductive side of the stator core (the side facing the air gap), resulting in an excessively large air gap and adversely affecting motor performance. Technical issues

[0004] The main objective of this invention is to provide a stator assembly and motor with higher strength, more reliable structure, and the ability to reduce air gap and improve motor performance. Technical solutions

[0005] To achieve the above objectives, the present invention provides a stator assembly comprising:

[0006] The mounting plate has an inner side and an outer side that are axially opposite to each other. The mounting plate has a plurality of mounting holes that pass through the mounting plate along the axial direction. The plurality of mounting holes are spaced apart in the circumferential direction. A support rib is defined between every two adjacent mounting holes in the circumferential direction. The mounting plate is used to connect and fix to the housing.

[0007] The system comprises multiple segmented iron cores, each inserted into a corresponding mounting hole. Each segmented iron core has a mounting portion, and each segmented iron core protrudes from the outer surface of the mounting plate to face the air gap.

[0008] Multiple segmented slot wedges are provided, and the multiple segmented slot wedges are stacked one-to-one on the outside of the multiple supporting ribs. Each segmented slot wedge is provided with an installation mating part, and the installation mating part cooperates with the adjacent segmented iron core in the circumferential direction to limit the movement.

[0009] Optionally, the segmented slot wedge includes an insulating part and a magnetically conductive part, the magnetically conductive part is disposed on both sides of the insulating part in the circumferential direction, and the mounting mating part is disposed on each of the magnetically conductive parts.

[0010] Optionally, the mounting portion is a guide groove formed on the two side walls of the segmented iron core in the circumferential direction, and the mounting mating portion is a flange protruding on each of the magnetic conductive portions. Each of the guide grooves and each of the flanges extends radially, and each of the flanges is correspondingly embedded in the corresponding guide grooves.

[0011] Optionally, the flange extends obliquely from the outside to the inside in the protruding direction.

[0012] Optionally, the mounting plate includes an inner ring portion and an outer ring portion arranged sequentially along the inner and outer rings. The inner ring portion and the outer ring portion are connected by a plurality of support ribs. The outer side of the inner ring portion is not higher than the support ribs, and the outer side of the outer ring portion is higher than the support ribs.

[0013] Optionally, the inner ring portion has the same thickness as the support rib and is flush with it, while the outer ring portion has a greater thickness than the support rib and its inner side is flush with the support rib.

[0014] Optionally, the outer ring portion has an annular wall facing the inner ring in the radial direction, and the annular wall is recessed with a plurality of limiting grooves, which are distributed at intervals in the circumferential direction and correspond one-to-one to accommodate the outer ends of the plurality of segmented groove wedges in the radial direction.

[0015] Optionally, each of the limiting grooves extends through the outer side of the outer ring portion on one side in the axial direction, and is flush with the outer side of the support rib on the other side in the axial direction.

[0016] Optionally, each of the segmented groove wedges is bonded and fixed to the outside of the corresponding support rib.

[0017] Optionally, two mounting plates are provided, with the inner sides of the two mounting plates arranged opposite each other in the axial direction, and the two ends of each segmented iron core are respectively inserted into the mounting holes on the two mounting plates.

[0018] The present invention also provides an electric motor, comprising:

[0019] chassis;

[0020] The stator assembly as described above is mounted on the housing; and...

[0021] The rotor is rotatably mounted on the housing and disposed on at least one side of the stator assembly in the axial direction, and an air gap is defined between the rotor and the stator assembly.

[0022] Optionally, the housing includes an inner shell and an outer shell arranged sequentially along the inner and outer rings;

[0023] The mounting plate has an inner ring portion and an outer ring portion arranged sequentially along the inner and outer rings. The inner ring portion and the outer ring portion are connected by a plurality of support ribs. The inner ring portion is connected and fixed to the inner shell, and the outer ring portion is connected and fixed to the outer shell. Beneficial effects

[0024] The stator assembly provided by this invention includes a mounting plate, segmented iron cores, and segmented slot wedges. The mounting plate is used to connect and fix to the housing and has multiple mounting holes arranged at intervals in the circumferential direction. A support rib is defined between every two adjacent mounting holes in the circumferential direction. Multiple segmented iron cores are inserted into the multiple mounting holes one by one and are matched with adjacent segmented slot wedges in the circumferential direction. Each segmented slot wedge is stacked on the outside of the corresponding support rib. In this way, the stator assembly is formed by the interlocking and cooperation of the segmented iron cores, segmented slot wedges, and mounting plate. In particular, the axial force on the segmented iron cores is transmitted to the support ribs through the slot wedges, so that each segmented iron core can be reliably supported by the mounting plate. This design effectively enhances the overall strength and stability of the structure. In addition, the magnetic conductive surface of the segmented iron cores facing the air gap does not require an external covering structure or adhesive, resulting in a smaller effective air gap for the motor and improving motor performance. The structure of components such as segmented iron cores, segmented slot wedges, and mounting plates is relatively simple, and the manufacturing process is less difficult. Furthermore, there is no need to pre-assemble mounting plates and slot wedges, which simplifies the assembly process of stator assemblies and reduces production costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 is a partial three-dimensional structural schematic diagram of an embodiment of the motor provided by the present invention;

[0027] Figure 2 is a partial three-dimensional structural diagram of the motor in Figure 1 from another perspective;

[0028] Figure 3 is a three-dimensional structural diagram of the mounting plate in Figure 1;

[0029] Figure 4 is a three-dimensional structural diagram of the segmented iron core and segmented slot wedges in Figure 1;

[0030] Figure 5 is a three-dimensional structural diagram of the segmented iron core in Figure 4;

[0031] Figure 6 is a three-dimensional structural diagram of the segmented slot wedge in Figure 4;

[0032] Figure 7 is a partial cross-sectional view of the motor in Figure 1.

[0033] Explanation of icon numbers:

[0034] 100-Stator assembly; 10-Mounting plate; 11-Mounting hole; 12-Support rib; 13-Inner ring; 14-Outer ring; 141-Annular wall; 142-Limiting groove; 20-Segmented core; 21-Guide groove; 30-Segmented groove wedge; 31-Insulation part; 32-Magnetic part; 33-Flange; 40-Winding; 200-Housing; 201-Outer shell; 202-Inner shell.

[0035] The realization of the objective of this invention, its functional characteristics and excellent effects will be further explained below in conjunction with specific embodiments and accompanying drawings. Embodiments of the present invention

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that if the embodiments of the present invention involve directional indication, the directional indication is only used to explain the relative positional relationship and movement of the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0038] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0039] This invention provides a stator assembly 100 and a motor having therein. Referring to Figures 1 and 2, the motor provided by this invention includes a housing 200, the aforementioned stator assembly 100, and a rotor. This motor is an axial magnetic field motor, wherein the stator assembly 100 is mounted on the housing 200, the rotor is rotatably mounted on the housing 200, the rotor is disposed on at least one side of the stator assembly 100 in the axial direction, and an air gap is defined between the rotor and the stator assembly 100.

[0040] In this embodiment, the housing 200 provides protection and support for the stator assembly 100 and the rotor. The magnetic field generated by the stator assembly 100 interacts with the rotor to achieve the conversion of electrical energy into mechanical energy. The material of the housing 200 can be selected according to the operating environment and performance requirements of the motor. For example, aluminum alloy can be used in applications requiring good heat dissipation, and materials with electromagnetic shielding properties can be used in environments requiring electromagnetic shielding. The shape and structure of the housing 200 can be designed as needed. In an optional embodiment, the housing 200 includes an inner shell 202 and an outer shell 201 arranged sequentially along the inner and outer rings, thereby reliably mounting the stator assembly 100 and providing limiting measures during installation to improve installation efficiency. In this embodiment, the presence of an air gap ensures that the rotor can rotate freely in the magnetic field. It is understood that the size and uniformity of the air gap have a significant impact on the performance of the motor.

[0041] Preferably, the motor in this embodiment is a single-stator dual-rotor motor, that is, the stator assembly 100 has a rotor on each side in the axial direction. In this case, the connection and fixation between the stator assembly 100 and the housing 200 need to be optimized to ensure that the air gap size on both sides of the stator assembly 100 is within the optimal range, while ensuring that the installation of the stator assembly 100 has sufficient strength and reliability.

[0042] Please refer to Figures 3 to 7. The stator assembly 100 provided by this invention includes a mounting plate 10, multiple segmented iron cores 20, and multiple segmented slot wedges 30. The mounting plate 10 has inner and outer sides arranged axially opposite to each other, and has multiple mounting holes 11 that are axially continuous and spaced apart in the circumferential direction. Support ribs 12 are formed between adjacent mounting holes 11. The mounting plate 10 is used to connect and fix to the housing 200. The material of the mounting plate 10 can be selected according to the operating environment and performance requirements of the motor. It should have sufficient strength and insulation performance to meet the installation and magnetic conduction requirements of the segmented iron cores 20. Preferably, the mounting plate 10 is made of insulating composite material. The mounting plate 10 is also provided with a mounting structure adapted to the housing 200 so that the stator assembly 100 can be installed on the housing 200 through the mounting structure, providing stable support for each segmented iron core 20. The specific structure of the mounting structure can be selected and designed as needed, such as studs, screw holes, or snap-fit ​​structures.

[0043] Multiple segmented iron cores 20 are inserted one-to-one into the mounting holes 11. Each segmented iron core 20 has a mounting part, the end face of which protrudes from the outer side of the mounting plate 10 and faces the air gap. Each segmented iron core 20 is wound with a winding 40. Multiple segmented slot wedges 30 are stacked one-to-one on the outer side of the support rib 12. Each segmented slot wedge 30 has a mounting mating part, which, through mating with the mounting part, achieves a limiting fit with the adjacent segmented iron core 20.

[0044] In this embodiment, the mounting plate 10 serves as the basic support structure of the stator assembly 100. The shape of its mounting holes 11 is adapted to the corresponding segmented iron cores 20. The design of the support ribs 12 provides precise positioning and stable support for the segmented iron cores 20 and the segmented slot wedges 30. During installation, the segmented iron cores 20 are first inserted into the mounting holes 11, thereby achieving effective pre-positioning of the segmented iron cores 20 in the radial and circumferential directions. Then, the segmented slot wedges 30 are inserted between two adjacent segmented iron cores 20 in the circumferential direction through the mounting mating parts. This restricts the axial movement of the segmented iron cores 20. Through the above structure, the segmented iron cores 20, the segmented slot wedges 30, and the mounting plate 10 are interlocked and assembled to form the stator assembly 100. In particular, the axial force on the segmented iron cores 20 is transmitted to the support ribs 12 through the slot wedges, so that each segmented iron core 20 can be reliably supported by the mounting plate 10. This design effectively enhances the overall strength and stability of the structure. Furthermore, the magnetically conductive surface of the segmented iron core 20 facing the air gap does not require an external covering structure or adhesive, resulting in a smaller working air gap for the motor and improving motor performance. The structures of components such as the segmented iron core 20, the segmented slot wedges 30, and the mounting plate 10 are relatively simple, with lower manufacturing difficulty. Moreover, the mounting plate 10 and slot wedges do not need to be pre-assembled, simplifying the assembly process of the stator assembly 100 and reducing production costs.

[0045] Ideally, each segmented slot wedge 30 is bonded and fixed to the outer side of its corresponding support rib 12. The adhesive can be selected according to the motor's operating environment. For example, in high-temperature environments, a high-temperature resistant epoxy resin adhesive can be used; in humid environments, an adhesive with good waterproof properties can be selected. This bonding and fixing method further enhances the connection strength between the segmented slot wedge 30 and the support rib 12, reduces the risk of loosening of the segmented slot wedge 30, and improves the structural stability of the stator assembly 100.

[0046] Based on the previous embodiment, referring to Figure 6, the segmented slot wedge 30 includes an insulating portion 31 and a magnetically conductive portion 32. The magnetically conductive portions 32 are disposed on both sides of the insulating portion 31 in the circumferential direction, and the mounting fitting portion is disposed on each of the magnetically conductive portions 32. The insulating portion 31 can be made of different types of high-performance insulating materials, such as polyimide, to improve the insulation performance and high-temperature resistance of the segmented slot wedge 30. The shape and size of the magnetically conductive portion 32 can be optimized according to the magnetic circuit design of the motor, for example, by increasing the thickness of the magnetically conductive portion 32 or changing its cross-sectional shape to improve its magnetic conductivity.

[0047] In this embodiment, the insulating part 31 effectively isolates the current conduction between the segmented slot wedge 30 and other components, preventing short circuits. The magnetic guiding part 32 guides the distribution of the magnetic field, making the magnetic field more concentrated and uniform, thus improving the electromagnetic performance of the motor. The mounting mating part is located on the magnetic guiding part 32, ensuring an effective connection between the segmented slot wedge 30 and the segmented iron core 20, and forming a complete magnetic guiding structure with the stator iron core without affecting the conduction of the magnetic field. This structural design enhances the magnetic permeability of the motor, contributing to improved motor performance.

[0048] Further, referring to Figures 4 to 6, the mounting portion consists of guide grooves 21 formed on the two circumferential side walls of the segmented iron core 20, and the mounting mating portion consists of flanges 33 protruding from each magnetically conductive part 32. Each guide groove 21 and each flange 33 extends radially, and each flange 33 is correspondingly embedded in the corresponding guide groove 21. Specifically, the shapes of the guide grooves 21 and flanges 33 are mutually adapted to achieve a good fitting effect. Their specific shape design can be diversified; for example, the guide grooves 21 can be designed as trapezoids, dovetails, etc., and the shapes of the flanges 33 can also be adjusted accordingly to increase the stability and reliability of the connection. Preferably, the flange 33 has a chamfer at the section inserted into the guide groove 21 to facilitate the insertion of the slot wedge between the corresponding two segmented iron cores 20, improving assembly efficiency. In terms of machining accuracy, high-precision machining equipment and processes can be used to ensure the dimensional accuracy and surface quality of the guide grooves 21 and flanges 33, reducing assembly gaps and improving assembly accuracy.

[0049] Preferably, the flange 33 extends obliquely from the outside to the inside in the protruding direction. Specifically, the downward tilt angle of the flange 33 can be adjusted according to the magnetic field and structural requirements of the motor. The optimal angle can be determined through experiments or simulation analysis for different motors. During the manufacturing process, mold forming or machining can be used to ensure the tilt accuracy of the flange 33.

[0050] In this embodiment, the inclined design of the flange 33 makes it easier for the segmented slot wedge 30 to be inserted into the guide slot 21 of the segmented iron core 20 during installation, providing a certain guiding effect and reducing assembly difficulty. More importantly, it makes the slotted position of the segmented iron core 20 relatively close to its magnetic surface, improving the magnetic conductivity of the assembled segmented iron core 20. In addition, during motor operation, the inclined flange 33 can better distribute the force it bears, enhancing the connection stability between the segmented slot wedge 30 and the segmented iron core 20 and reducing the risk of loosening.

[0051] Based on the above embodiments, please continue to refer to Figures 1 to 3 and Figure 7. The mounting plate 10 includes an inner ring portion 13 and an outer ring portion 14 arranged sequentially along the inner and outer rings. The inner ring portion 13 and the outer ring portion 14 are connected by a plurality of support ribs 12. Preferably, the outer ring portion 14, the inner ring portion 13, and the plurality of support ribs 12 are integrally formed. The outer side of the inner ring portion 13 is not higher than the support ribs 12, and the outer side of the outer ring portion 14 is higher than the support ribs 12. Preferably, the inner ring portion 13 and the outer ring portion 14 are respectively provided with mounting structures, so that the inner ring portion 13 is connected and fixed to the inner shell 202 of the housing 200 through the mounting structure, and the outer ring portion 14 is connected and fixed to the outer shell 201 of the housing 200 through the mounting structure. In an optional embodiment, as shown in Figure 3, the mounting structure is a plurality of screw holes arranged circumferentially on the mounting plate 10.

[0052] In this embodiment, the inner ring portion 13 and the outer ring portion 14 are connected by the support rib 12, forming a stable frame structure that provides reliable support for the segmented iron core 20 and the segmented slot wedge 30. The design that the outer side of the inner ring portion 13 is not higher than the support rib 12, while the outer side of the outer ring portion 14 is higher than the support rib 12, allows the segmented slot wedge 30 to be inserted from the inner ring position between two adjacent segmented iron cores 20 in the circumferential direction during installation. Furthermore, the outer ring portion 14 can prevent the segmented slot wedge 30 from moving outward in the radial direction, thus limiting the installation of the segmented slot wedge 30. This makes the assembly and positioning of the segmented slot wedge 30 more convenient and enhances the structural stability of the stator assembly 100.

[0053] It is understood that the thicknesses of the inner ring portion 13, the outer ring portion 14, and the support rib 12 can be adjusted according to the motor's load and structural strength requirements. For example, in a high-load motor, the thickness of the outer ring portion 14 can be appropriately increased to improve its load-bearing capacity. In this embodiment, the inner ring portion 13 and the support rib 12 have the same thickness and are flush, while the outer ring portion 14 is thicker than the support rib 12 and its inner side is flush with the support rib 12. This achieves a structure where the outer side of the outer ring portion 14 is higher than the support rib 12, which strengthens the load-bearing capacity of the mounting plate 10 while facilitating its manufacturing.

[0054] Further, referring to Figure 3, the outer ring portion 14 has an annular wall 141 facing the inner ring in the radial direction. Multiple limiting grooves 142 are recessed on the annular wall 141, spaced apart circumferentially, and correspondingly accommodate the outer ends of multiple segmented wedges 30 in the radial direction. In this embodiment, the shape and size of the limiting grooves 142 can be precisely designed according to the outer end shape of the segmented wedges 30, matching the outer end shape of the segmented wedges 30. Preferably, a chamfer is provided at the opening of the limiting groove 142 facing the segmented wedges 30 to facilitate the assembly of the segmented wedges 30. High-precision machining processes, such as CNC machining, can be used when manufacturing the limiting grooves 142 to ensure the accuracy and consistency of the limiting grooves 142. To increase the friction and sealing between the segmented wedges 30 and the limiting grooves 142, some elastic material or sealing gaskets can be placed between them.

[0055] In this embodiment, the limiting groove 142 on the annular wall 141 provides additional radial limiting for the segmented slot wedge 30, further enhancing the stability of the segmented slot wedge 30 and preventing radial displacement during motor operation. This design improves the structural robustness of the stator assembly 100, contributes to the stable distribution of the motor's magnetic field, and enhances the motor's performance and reliability.

[0056] Preferably, each limiting groove 142 extends through the outer side of the outer ring portion 14 on one side in the axial direction, and is flush with the outer side of the support rib 12 on the other side in the axial direction. This design simplifies the molding of the mounting plate 10 and facilitates demolding, while ensuring the ease of installation of the segmented slot wedge 30 and its axial positioning accuracy. In this embodiment, the design of the limiting groove 142 extending through the outer side of the outer ring portion 14 facilitates the installation of the segmented slot wedge 30, and the design of the bottom wall of the limiting groove 142 being flush with the outer side of the support rib 12 ensures a tight fit between the segmented slot wedge 30 and the support rib 12, enhancing the overall stability of the stator assembly 100 and improving the assembly efficiency and ease of use and maintenance of the motor.

[0057] In an optional embodiment, when the motor is a single-stator dual-rotor motor, two mounting plates 10 are provided, with their inner sides facing each other axially. The two ends of each segmented iron core 20 are respectively inserted into the mounting holes 11 on the two mounting plates 10. The distance between the two mounting plates 10 can be adjusted according to the axial dimension requirements of the segmented iron core 20 to accommodate the needs of different types of motors.

[0058] After assembly, the two mounting plates 10 axially clamp multiple segmented iron cores 20, providing support points at both ends of the segmented iron cores 20, improving their stability and reducing vibration and noise during motor operation. This structural design helps to achieve a uniform distribution of the motor's magnetic field, thus improving motor performance.

[0059] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structure made using the contents of the present invention specification and drawings, or any direct or indirect application in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A stator assembly, characterized in that, include: The mounting plate has an inner side and an outer side that are axially opposite to each other. The mounting plate has a plurality of mounting holes that pass through the mounting plate along the axial direction. The plurality of mounting holes are spaced apart in the circumferential direction. A support rib is defined between every two adjacent mounting holes in the circumferential direction. The mounting plate is used to connect and fix to the housing. The system comprises multiple segmented iron cores, each inserted into a corresponding mounting hole. Each segmented iron core has a mounting portion, and each segmented iron core protrudes from the outer surface of the mounting plate to face the air gap. Multiple segmented slot wedges are provided, and the multiple segmented slot wedges are stacked one-to-one on the outside of the multiple supporting ribs. Each segmented slot wedge is provided with an installation mating part, and the installation mating part cooperates with the adjacent segmented iron core in the circumferential direction to limit the movement.

2. The stator assembly as claimed in claim 1, characterized in that, The segmented slot wedge includes an insulating part and a magnetically conductive part. The magnetically conductive part is disposed on both sides of the insulating part in the circumferential direction, and the mounting and fitting part is disposed on each of the magnetically conductive parts.

3. The stator assembly as described in claim 2, characterized in that, The mounting portion is a guide groove formed on the two side walls of the segmented iron core in the circumferential direction, and the mounting mating portion is a flange protruding on each of the magnetic conductive portions. Each of the guide grooves and each of the flanges extends radially, and each of the flanges is correspondingly embedded in the corresponding guide grooves.

4. The stator assembly as claimed in claim 3, characterized in that, The flange extends obliquely from the outside to the inside in the protruding direction.

5. The stator assembly as claimed in claim 1, characterized in that, The mounting plate includes an inner ring portion and an outer ring portion arranged sequentially along the inner and outer rings. The inner ring portion and the outer ring portion are connected by a plurality of support ribs. The outer side of the inner ring portion is not higher than the support ribs, and the outer side of the outer ring portion is higher than the support ribs.

6. The stator assembly as claimed in claim 5, characterized in that, The inner ring portion has the same thickness as the support rib and is flush with it, while the outer ring portion has a greater thickness than the support rib and its inner side is flush with the support rib.

7. The stator assembly as claimed in claim 5, characterized in that, The outer ring portion has an annular wall facing the inner ring in the radial direction. The annular wall is recessed with a plurality of limiting grooves. The plurality of limiting grooves are distributed at intervals in the circumferential direction and correspond one-to-one to accommodate the outer ends of the plurality of segmented groove wedges in the radial direction.

8. The stator assembly as claimed in claim 7, characterized in that, Each of the aforementioned limiting grooves extends through the outer side of the outer ring portion on one side in the axial direction, and is flush with the outer side of the supporting rib on the other side in the axial direction.

9. The stator assembly as claimed in claim 1, characterized in that, Each of the segmented groove wedges is bonded and fixed to the outside of the corresponding support rib.

10. The stator assembly as claimed in any one of claims 1 to 9, characterized in that, The mounting plate is provided in two parts, with the inner sides of the two mounting plates facing each other in the axial direction. The two ends of each segmented iron core are respectively inserted into the mounting holes on the two mounting plates in the axial direction.

11. An electric motor, characterized in that, include: chassis; The stator assembly as described in any one of claims 1 to 10 is mounted on the housing; as well as, The rotor is rotatably mounted on the housing and disposed on at least one side of the stator assembly in the axial direction, and an air gap is defined between the rotor and the stator assembly.

12. The motor as described in claim 11, characterized in that, The housing includes an inner shell and an outer shell arranged sequentially along the inner and outer rings; The mounting plate has an inner ring portion and an outer ring portion arranged sequentially along the inner and outer rings. The inner ring portion and the outer ring portion are connected by a plurality of support ribs. The inner ring portion is connected and fixed to the inner shell, and the outer ring portion is connected and fixed to the outer shell.

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