Stator assembly and electric machine

Abstract

The application discloses a kind of stator assembly and motor.The stator assembly includes: multiple stator windings, the stator winding includes insulating frame and coil wound on the insulating frame, the insulating frame has insulating frame mounting hole;Multiple stator cores, each stator core is installed in corresponding insulating frame mounting hole;Winding positioning sleeve, the winding positioning sleeve is used to position multiple stator windings;Injection body, the stator core, the stator winding and the winding positioning sleeve are integrally injection molded by the injection body, and motor mounting fixing hole is formed on the injection body.According to the stator assembly of the application, by integrally injection molding the stator core, the stator winding and the winding positioning sleeve through the injection body, the axial dimension of the stator assembly can be reduced, and when the stator assembly is applied to the motor, the axial dimension of the motor can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator assembly and an electric machine having the stator assembly. BACKGROUND

[0002] In the related art, the axial dimension of the stator core is large, and when the stator core is applied to an electric machine, the axial dimension of the electric machine is also large, the electric machine occupies a large space, and is not conducive to the design of small-sized products. SUMMARY

[0003] The present application aims to at least solve one of the above technical problems in the prior art to some extent. To this end, the present application provides a stator assembly with a small axial dimension.

[0004] The present application also provides an electric machine having the above stator assembly.

[0005] The stator assembly according to an embodiment of the present application comprises: a plurality of stator windings, the stator windings comprising an insulating frame and a coil wound on the insulating frame, the insulating frame having an insulating frame mounting hole; a plurality of stator cores, each of the stator cores being mounted in a corresponding insulating frame mounting hole; a winding positioning sleeve for positioning the plurality of stator windings; and an injection molded body, the stator cores, the stator windings and the winding positioning sleeve being integrally injection molded by the injection molded body, the injection molded body having a motor mounting fixing hole.

[0006] The stator assembly according to an embodiment of the present application, by integrally injection molding the stator core, the stator winding and the winding positioning sleeve by the injection molded body, can reduce the axial dimension of the stator assembly, and when the stator assembly is applied to an electric machine, is conducive to reducing the axial dimension of the electric machine.

[0007] According to some embodiments of the present application, two adjacent stator cores form a stator slot, each stator core has a leading end and a trailing end, the trailing end is opposite to the leading end, in the axial direction of the stator assembly, the offset angle of the trailing end relative to the leading end is α, and in the circumferential direction of the stator assembly, the offset angle of the trailing end relative to the leading end is β, wherein α and β satisfy the relationship: 0.1×(360° / slot number)≤α≤2×(360° / slot number), 1°≤β≤20°.

[0008] According to some embodiments of the present application, the trailing end is a sector face, the outer end of the sector face is a large-diameter end, and the inner end of the sector face is a small-diameter end.

[0009] According to some embodiments of the present application, the inner end of the stator core is an arc-shaped end, the outer end of the stator core is a chamfered end, and the included angle of the chamfer is θ, which satisfies the relationship: 120°≤θ≤170°.

[0010] According to some embodiments of the present application, the inner end and the outer end of the stator core are both arc-shaped ends.

[0011] According to some embodiments of the present application, the plurality of stator cores are separated from each other and uniformly distributed along the circumference of the stator assembly, and the plurality of stator cores have the same offset angle.

[0012] According to some embodiments of the present application, one end of the insulation bracket facing the winding positioning sleeve has an insulation bracket positioning structure, the surface of the winding positioning sleeve facing the insulation bracket has a positioning sleeve positioning structure, and the insulation bracket positioning structure and the positioning sleeve positioning structure are positioned and matched.

[0013] According to another aspect of the present application, a motor comprises:

[0014] The stator assembly described above;

[0015] A first end cover is located at one axial end of the stator assembly;

[0016] A second end cover is located at the other axial end of the stator assembly;

[0017] A first rotor disc is arranged between the first end cover and the stator assembly;

[0018] A second rotor disc is arranged between the second end cover and the stator assembly;

[0019] A rotating shaft passes through the first end cover, the first rotor disc, the stator assembly, the second rotor disc, and the second end cover, and a first bearing is arranged at the joint of the rotating shaft and the first end cover, and a second bearing is arranged at the joint of the rotating shaft and the second end cover.

[0020] The motor according to the embodiments of the present application is a double-rotor axial motor, which has a smaller axial dimension, and the production process of the second stator assembly is simplified, which is conducive to promoting the batch production of axial motors.

[0021] According to some embodiments of the present application, the first rotor disc and the second rotor disc each comprise a rotor disc body and a permanent magnet arranged on the rotor disc body, and a rotor positioning structure is further arranged on the rotor disc body, a shaft sleeve is arranged on the rotating shaft, a shaft sleeve positioning structure is arranged on the shaft sleeve, and the rotor positioning structure is adapted to be positioned and matched with the shaft sleeve positioning structure.

[0022] According to some embodiments of the present application, the permanent magnets are sintered permanent magnets, which are fixedly bonded to the rotor disc body.

[0023] According to some embodiments of the present application, the permanent magnets are magnetic powder permanent magnets, which are formed in the rotor disc body by die casting.

[0024] According to some embodiments of the present application, the magnetic poles of the permanent magnets are arranged in sequence of N pole, S pole or arranged in Halbach array.

[0025] Additional aspects and advantages of the present application will be given in part in the following description, become apparent from the following description, or be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective view of a stator core according to an embodiment of the present application;

[0027] Figure 2 is a front view of a stator core according to an embodiment of the present application;

[0028] Figure 3 is a top view of a stator core according to an embodiment of the present application;

[0029] Figure 4 is a sectional view of a stator assembly according to an embodiment of the present application;

[0030] Figure 5 is a top view of a stator assembly according to an embodiment of the present application;

[0031] Figure 6 is a perspective view of a stator assembly according to an embodiment of the present application;

[0032] Figure 7 is a front view of a stator assembly according to an embodiment of the present application;

[0033] Figure 8 is a perspective view of a stator winding;

[0034] Figure 9 is a perspective view of a winding positioning sleeve;

[0035] Figure 10 is a perspective view of a motor according to an embodiment of the present application;

[0036] Figure 11 is a sectional view of a motor according to an embodiment of the present application;

[0037] Figure 12 is a front view of a motor according to an embodiment of the present application;

[0038] Figure 13is a top view of the motor according to an embodiment of the present application;

[0039] Figure 14 is a perspective view of the first rotor disc, the first end cover, the rotating shaft, the first stop ring and the first bearing;

[0040] Figure 15 is a top view of the first rotor disc, the first end cover, the rotating shaft, the first stop ring and the first bearing;

[0041] Figure 16 is a perspective view of the rotor disc body and the permanent magnet.

[0042] Reference signs:

[0043] motor 100, stator assembly 10, stator core 1, first end 121, last end 122, outer end A, inner end B, insulation frame positioning structure 211, positioning sleeve positioning structure 601, assembly avoiding hole 15, stator winding 2, insulation frame 21, insulation frame positioning structure 211, coil 22, insulation frame mounting hole 23, injection molding body 4, mounting lug 41, motor mounting fixing hole 42, rotor disc body 201, permanent magnet 202, rotor avoiding hole 203, first rotor disc 205, second rotor disc 206, rotating shaft 30, first stop ring 301, second stop ring 302, shaft sleeve 303, first bearing 40, second bearing 50, winding positioning sleeve 60, positioning sleeve positioning structure 601, first end cover 70, second end cover 80. DETAILED DESCRIPTION

[0044] Embodiments of the present application are described in detail below with reference to the accompanying drawings, in which examples of the embodiments are shown, wherein the same or similar notations are used to denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0045] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0046] In addition, the terms "first", "second", "third", etc. are used herein only to describe different instances, and are not used to denote or imply relative importance or a number of indications of the technical features indicated. Thus, the technical features defined with "first", "second", etc. can explicitly or implicitly include one or more of the technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0047] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0048] The following will be described in detail Figures 1-16 The stator assembly 10 according to the embodiments of the present application and the motor 100 having the above stator assembly 10 will be described in detail.

[0049] Referring to Figures 4-7 As shown, the stator assembly 10 according to the embodiments of the present application can include a stator winding 2, a stator core 1, a winding positioning sleeve 60, and an injection molded body 4.

[0050] The stator winding 2 is a plurality of stator windings 2, and each stator winding 2 includes an insulating frame 21 and a coil 22. The coil 22 can be an enameled wire, and the insulating frame 21 has a winding groove. The coil 22 is wound on the winding groove of the insulating frame 21. Specifically, the insulating frame 21 can include two parallel plate structures, and the two plate structures are connected by a connecting arm. The connecting arm and the two plate structures are configured as a "H" shaped structure. The coil 22 is adapted to be wound on the connecting arm, that is, the winding groove is formed between the two plate structures.

[0051] The insulating frame 21 has an insulating frame mounting hole 23, and the stator core 1 is a plurality of stator cores 1. Each stator core 1 is mounted in the corresponding insulating frame mounting hole 23. Specifically, the insulating frame 21 has an insulating frame mounting hole 23 adapted to the corresponding stator core 1. When the stator winding 2 and the stator core 1 are assembled, the stator core 1 is inserted into the corresponding insulating frame mounting hole 23. In some embodiments of the present application, the number of stator cores 1 is equal to the number of stator windings 2, so that the stator core 1 corresponds to the insulating frame mounting hole 23 one by one. The stator core 1 can be press molded by soft magnetic composite material (such as BMC material), or can be punched by silicon steel, or can be processed by coiled material.

[0052] The winding positioning sleeve 60 is used for positioning the plurality of stator windings 2, and the winding positioning sleeve 60 can be configured as a circular ring structure, so that the winding positioning sleeve 60 has a simple shape and the manufacturing process is relatively easy. In some embodiments, the plurality of stator windings 2 can be arranged around the outer periphery of the winding positioning sleeve 60. In other embodiments, the winding positioning sleeve 60 can be arranged around the outer periphery of the plurality of stator windings 2.

[0053] Referring to Figures 4-7 As shown, the stator core 1, the stator winding 2 and the winding positioning sleeve 60 are integrally injection molded by the injection body 4, that is, the stator assembly 10 according to the embodiment of the present application is configured as an injection molded stator assembly, the injection molding process is simple, and the assembly step is omitted, which is beneficial to improve the production efficiency of the stator assembly 10, while reducing the use of traditional fasteners, which is beneficial to reduce the weight of the stator assembly 10. In addition, the injection body 4 occupies the axial space of the split structure in the related art, which is beneficial to reduce the overall axial size of the stator assembly 10.

[0054] The injection body 4 is provided with a motor mounting fixing hole 42. That is, the injection body 4 serves as a housing, so that when the stator assembly 10 is applied to the motor 100, a separate housing does not need to be additionally provided. The number of motor mounting fixing holes 42 can be multiple, for example, three, four, etc., and the plurality of motor mounting fixing holes 42 are uniformly distributed in the circumferential direction. The injection body 4 can form an outwardly protruding mounting lug 41, and the motor mounting fixing hole 42 is formed on the mounting lug 41.

[0055] In some embodiments, the injection body 4 is a BMC material (Bulk Molding Compound), which has excellent flow characteristics, insulation, corrosion resistance, heat resistance and flame retardance. For example, the BMC material can withstand a temperature of 150-280°C, and has a small shrinkage rate (only three to five ten-thousandths), and can be injection molded at a low molding temperature (120-160°C). Thus, the BMC material is suitable for various molding processes, and the injection body 4 made of the BMC material can have various shapes, which is beneficial to meet different shape requirements.

[0056] In some embodiments, the injection body 4 is a resin material, which has a low cost and is beneficial to reduce the overall cost of the stator assembly 10.

[0057] In the processing of the stator assembly 10, the stator winding 2 with the pre-wound coil is first positioned and matched with the winding positioning sleeve 60, then the stator core 1 is installed in the corresponding insulation frame mounting hole 23 of the stator winding 2, and then the stator core 1, the stator winding 2 and the winding positioning sleeve 60 are injection molded with an injection material, so that the production process of the stator assembly 10 is simplified, which is beneficial to promote the mass production of the motor 100.

[0058] According to the stator assembly 10 of the embodiment of the present application, by integrally injecting the stator core 1, the stator winding 2 and the winding positioning sleeve 60 through the injection body 4, the axial dimension of the stator assembly 10 can be reduced, which is beneficial to reduce the axial dimension of the motor 100 when the stator assembly 10 is applied to the motor 100.

[0059] In some embodiments of the present application, in combination with Figures 1-6 As shown, the stator slot is formed between the two adjacent stator cores 1, each stator core 1 has a first end 121 and a second end 122 opposite to the first end 121, in the axial direction of the stator assembly 10, the offset angle of the second end 122 relative to the first end 121 is α, which satisfies the relationship: 0.1×(360° / slot number)≤α≤2×(360° / slot number), for example, α can be 3.6°, 10°, 20°, 30°, 35°, etc. In the circumferential direction of the stator assembly 10, the offset angle of the second end 122 relative to the first end 121 is β, which satisfies the relationship: 1°≤β≤20°. For example, β=1°, 5°, 10°, 15°, 20°, etc. The existence of α and β makes the distance between the second end 122 and the first end 121 smaller, thereby the axial dimension of the stator core 1 can be reduced. At the same time, when the stator core 1 is applied to the motor 100, the back electromotive force harmonic can be effectively reduced, thereby the torque ripple and vibration noise of the motor 100 can be reduced.

[0060] Referring to Figures 2-3 As shown, in the axial direction of the stator assembly 10, the second end 122 is offset by α angle relative to the first end 121; in the circumferential direction of the stator assembly 10, the inner end B of the second end 122 is offset by β angle relative to the outer end A in the counterclockwise direction.

[0061] It can be understood that in the present application, the "outer end" refers to the end away from the center of the stator assembly 10, that is, the A end, and the "inner end" refers to the end towards the center of the stator assembly 10, that is, the B end. In the radial direction, the "outer end" is located on the outer side of the "inner end".

[0062] In one embodiment, the number of stator cores 1 is 18, and the number of stator slots is also 18, at this time, 0.1×(360° / slot number)≤α≤2×(360° / slot number) is 2°≤α≤40°, that is, in the axial direction of the stator assembly 10, the offset angle of the second end 122 relative to the first end 121 is less than 2° and not more than 40°.

[0063] Optionally, in a specific example, α=20° and β=10°.

[0064] According to the stator core 1 of the embodiment of the present application, by setting the end 122 to be offset in the axial direction and the circumferential direction of the stator assembly 10, the axial dimension of the stator core 1 can be reduced, and when the stator core 1 is applied to the motor 100, axial space can be saved, thereby facilitating reduction of the axial dimension of the motor 100. Meanwhile, by setting the end 122 of the stator core 1 to be offset in the axial direction and the circumferential direction of the stator assembly 10, back electromotive force harmonics can be effectively reduced, and when the stator core 1 is applied to the motor 100, torque ripple and vibration noise of the motor 100 can be reduced.

[0065] In some embodiments of the present application, as shown in Figure 1 , Figure 3 , the end 122 is a sector face, and the outer end A of the sector face is a large-diameter end, and the inner end B of the sector face is a small-diameter end, so that the large-diameter end of the sector face is located on a circle with a larger diameter, and the small-diameter end of the sector face is located on a circle with a smaller diameter, thereby making the structure of the stator assembly 10 more stable.

[0066] In some embodiments of the present application, as shown in Figure 1 , Figure 3 , the inner end B of the stator core 1 is an arc-shaped end, for example, the inner end B of the stator core 1 is a circular arc end, and the outer end A of the stator core 1 is a chamfered end, thereby improving the utilization rate of materials and reducing the weight of the stator core 1. The included angle of the chamfer is θ, and θ satisfies the relationship: 120°≤θ≤170°. For example, θ can be 120°, 130°, 140°, 150°, 160°, 170°, etc.

[0067] In some embodiments of the present application, the inner end B and the outer end A of the stator core 1 are both arc-shaped ends, for example, the inner end B and the outer end A of the stator core 1 are both circular arc ends.

[0068] In some embodiments of the present application, as shown in Figures 5-6 , the plurality of stator cores 1 are separated from each other, and the plurality of stator cores 1 are uniformly distributed along the circumferential direction of the stator assembly 10, the offset directions of the plurality of stator cores 1 are consistent and have the same offset angle, thereby facilitating simplification of the structure of the stator core 1, and further facilitating simplification of the manufacturing and processing process of the stator core 1.

[0069] In some embodiments of the present application, as shown in Figure 4 , Figures 8-9 , one end of the insulation bracket 21 facing the winding positioning sleeve 60 has an insulation bracket positioning structure 211, and the surface of the winding positioning sleeve 60 facing the insulation bracket 21 has a positioning sleeve positioning structure 601, the insulation bracket positioning structure 211 and the positioning sleeve positioning structure 601 are positioned and matched to realize the positioning and matching of the insulation bracket 21 and the winding positioning sleeve 60.

[0070] In some embodiments, one of the insulating frame positioning structure 211 and the positioning sleeve positioning structure 601 is a positioning groove and the other is a positioning protrusion. The positioning groove and the positioning protrusion are inserted and engaged to achieve the positioning function.

[0071] exist Figure 4 , Figures 8-9 In a specific example, the insulating frame positioning structure 211 is a positioning protrusion, the positioning sleeve positioning structure 601 is a positioning groove, and the positioning sleeve positioning structure 601 is set on the outer peripheral surface of the winding positioning sleeve 60. The extension direction of the positioning sleeve positioning structure 601 is not parallel to the axial direction of the winding positioning sleeve 60, which helps to improve the positioning reliability of the positioning sleeve positioning structure 601 on the insulating frame positioning structure 211.

[0072] Reference Figures 4-6 , Figures 10-16 As shown, the motor 100 according to another embodiment of the present invention may include: a first end cover 70, a second end cover 80, a first rotor disk 205, a second rotor disk 206, a rotating shaft 30, and the stator assembly 10 described above.

[0073] Among them, reference Figures 4-6 , Figures 10-15 As shown, a component clearance hole 15 is formed at the center of the stator assembly 10. The component clearance hole 15 is used for the shaft 30 to pass through. That is, when the stator assembly 10 is applied to the motor 100, the shaft 30 passes through the component clearance hole 15.

[0074] The first end cover 70 is located at one axial end of the stator assembly 10, and the second end cover 80 is located at the other axial end of the stator assembly 10. The first rotor disk 205 is disposed between the first end cover 70 and the stator assembly 10, and the second rotor disk 206 is disposed between the second end cover 80 and the stator assembly 10. The rotating shaft 30 passes through the first end cover 70, the first rotor disk 205, the stator assembly 10, the second rotor disk 206, and the second end cover 80. A first bearing 40 is provided at the mating point between the rotating shaft 30 and the first end cover 70, and a second bearing 50 is provided at the mating point between the rotating shaft 30 and the second end cover 80.

[0075] In some embodiments of the present invention, reference is made to... Figures 11-12 , Figure 14 As shown, the rotating shaft 30 is provided with a first retaining ring 301 and a second retaining ring 302. The first retaining ring 301 is used to axially limit the lower side of the first bearing 40, and the second retaining ring 302 is used to axially limit the upper side of the second bearing 50.

[0076] According to an embodiment of the present invention, the motor 100 is constructed as a dual-rotor axial motor 100, which has a small axial dimension and simplifies the manufacturing process of the second stator assembly 10, which is conducive to promoting the mass production of the axial motor 100.

[0077] In some embodiments of the present application, referring to Figures 14-16 As shown in the figure, the first rotor disc 205 and the second rotor disc 206 each include a rotor disc body 201, also known as rotor back iron, and permanent magnets 202, which are arranged on the rotor disc body 201. The permanent magnets 202 can be multiple, and the multiple permanent magnets 202 are uniformly arranged along the circumference of the rotor disc body 201.

[0078] The rotor disc body 201 is further provided with a rotor positioning structure, and the shaft 30 is provided with a shaft sleeve 303, and the shaft sleeve 303 is provided with a shaft sleeve 303 positioning structure. The rotor positioning structure is adapted to be positioned and matched with the shaft sleeve 303 positioning structure.

[0079] Referring to Figures 14-16 As shown in the figure, the center of the rotor disc body 201 is formed with a rotor avoiding hole 203 for the shaft 30 to pass through. The rotor disc body 201 is configured as a disc structure, which is beneficial to further reduce the axial size of the motor 100.

[0080] The rotor disc body 201 is further provided with a recess for avoiding the bearing, as Figure 11 As shown in the figure, the first rotor disc 205 and the second rotor disc 206 each have a recess recessed towards the stator assembly 10 to avoid the first bearing 40 and the second bearing 50, which can further reduce the axial size of the motor 100.

[0081] In some embodiments of the present application, the permanent magnet 202 is a sintered permanent magnet, which is adhesively fixed to the rotor disc body 201. The adhesive process can be realized by using glue.

[0082] In some other embodiments of the present application, the permanent magnet 202 is a magnetic powder permanent magnet, which is formed on the rotor disc body 201 by die casting.

[0083] In some embodiments of the present application, the magnetic poles of the permanent magnet 202 are arranged in sequence of N poles and S poles.

[0084] In some embodiments of the present application, the magnetic poles of the permanent magnet 202 are arranged in Halbach array.

[0085] The motor 100 of one specific example of the present application will be described in detail below. Figures 1-11

[0086] ​The motor 100 comprises a first end cover 70, a second end cover 80, a first rotor disc 205, a second rotor disc 206, a rotating shaft 30 and a stator assembly 10. The stator assembly 10 is that the stator winding 2 is pre-wound independently, and the winding positioning sleeve 60 is positioned and matched, then the stator core 1 is installed in the insulating frame mounting hole 23 corresponding to the stator winding 2, and then the stator core 1, the stator winding 2 and the winding positioning sleeve 60 are together injected by using BMC material, and the shell is formed by injection molding, so that the production process of the stator assembly 10 is simplified, which is beneficial to promote the batch production of the axial motor 100, and is beneficial to reduce the axial size of the stator assembly 10. Wherein, the stator core 1 is offset by an angle α in the axial direction and an angle β in the circumferential direction, which can greatly reduce the torque ripple and further reduce the axial size.

[0087] The installation process of the motor 100 can be: first, the first rotor disc 205 is installed and fixed to the rotating shaft 30, then the rotating shaft 30 is assembled with the first end cover 70 through the first bearing 40, at this time, the bearing inner ring of the first bearing 40 is in interference fit with the rotating shaft 30, the bearing outer ring of the first bearing 40 can be in interference fit, clearance fit or transition fit with the first end cover 70; then the stator assembly 10 is installed and matched with the rotating shaft 30, and then the rotating shaft 30 is assembled with the second end cover 80 through the second bearing 50, at this time, the bearing inner ring of the second bearing 50 is in interference fit with the rotating shaft 30, and the bearing outer ring of the second bearing 50 can be in interference fit, clearance fit or transition fit with the second end cover 80.

[0088] The axial magnetic field motor 100 according to the embodiment of the application has the advantages of thin axial thickness, small space volume, light weight, high efficiency and the like, provides a solution for miniaturization of household appliances, greatly reduces the torque ripple, and is beneficial to reduce the vibration noise of the motor 100. The motor 100 has superior performance and simple production process.

[0089] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In the specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0090] Although the embodiments of the present application have been shown and described above, it is understood that the above-described embodiments are exemplary and are not to be construed as limiting the present application, and that changes, modifications, substitutions and variations can be made by those skilled in the art without departing from the scope of the present application.

Claims

1. A stator assembly characterized by, The application relates to a stator assembly. The stator assembly comprises: a plurality of stator windings, each of which comprises an insulating frame and a coil wound on the insulating frame, and the insulating frame is provided with an insulating frame mounting hole; a plurality of stator cores, each of which is mounted in a corresponding insulating frame mounting hole; a winding positioning sleeve for positioning the plurality of stator windings; an injection molded body, the stator cores, the stator windings and the winding positioning sleeve being integrally injection molded by the injection molded body, and the injection molded body is provided with a motor mounting fixing hole; a stator slot is formed between two adjacent stator cores, each stator core has a first end and a second end opposite to the first end, and the offset angle of the second end relative to the first end in the axial direction of the stator assembly is alpha, and the offset angle of the second end relative to the first end in the circumferential direction of the stator assembly is beta, wherein alpha and beta satisfy the relationship: 0.1* (360° / slot number) <= alpha <= 2* (360° / slot number), and 1° <= beta <= 20°. The second end is a fan-shaped surface, the outer end of the fan-shaped surface is a large-diameter end, and the inner end of the fan-shaped surface is a small-diameter end. The inner end of the stator core is an arc-shaped end, and the outer end of the stator core is a chamfered end with a chamfered angle of theta, and theta satisfies the relationship: 120° <= theta <= 170°. The inner end and the outer end of the stator core are both arc-shaped ends. The plurality of stator cores are mutually separated and uniformly distributed along the circumferential direction of the stator assembly, and the plurality of stator cores have the same offset angle.

2. The stator assembly of claim 1, wherein, The end of the insulating frame facing the winding positioning sleeve is provided with an insulating frame positioning structure, the surface of the winding positioning sleeve facing the insulating frame is provided with a winding positioning sleeve positioning structure, and the insulating frame positioning structure and the winding positioning sleeve positioning structure are positioned and matched.

3. The stator assembly of any one of claims 1-2, wherein, The application also relates to a motor comprising the stator assembly.

4. The stator assembly of any one of claims 1-2, wherein, The motor comprises: the stator assembly; a first end cover located at one axial end of the stator assembly; a second end cover located at the other axial end of the stator assembly; a first rotor disc arranged between the first end cover and the stator assembly; a second rotor disc arranged between the second end cover and the stator assembly; and a rotating shaft penetrating through the first end cover, the first rotor disc, the stator assembly, the second rotor disc and the second end cover, and provided with a first bearing at the position where the rotating shaft is matched with the first end cover and a second bearing at the position where the rotating shaft is matched with the second end cover.

5. The stator assembly of claim 1, wherein, The first rotor disc and the second rotor disc each comprise a rotor disc body and a permanent magnet arranged on the rotor disc body, and the rotor disc body is further provided with a rotor positioning structure, the rotating shaft is provided with a shaft sleeve, the shaft sleeve is provided with a shaft sleeve positioning structure, and the rotor positioning structure is adapted to be positioned and matched with the shaft sleeve positioning structure.

6. The stator assembly of claim 1, wherein, The permanent magnet is a sintered permanent magnet, and the sintered permanent magnet is adhesively fixed to the rotor disc body.

7. An electric machine characterized by The permanent magnet is a magnetic powder permanent magnet, and the magnetic powder permanent magnet is formed on the rotor disc body by die casting. The magnetic poles of the permanent magnet are arranged in the order of N poles and S poles or in a Halbach array. ​ ​ ​ ​ ​ 8. The electric machine of claim 7, wherein, ​ 9. The electric machine of claim 8, wherein, ​ 10. The electric machine of claim 8, wherein, ​ 11. The electric machine of claim 8, wherein, ​

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