Stator assembly, motor and household appliance

Abstract

The invention discloses a stator assembly, a motor and a household appliance, and relates to the technical field of motors. The stator assembly comprises a stator iron core and a plastic coating part, the stator iron core is coated with the plastic coating part, and the plastic coating part is provided with a spigot boss on the end face of the opening part. The height of the stator core is h0, the distance between the first end face of the opening part and the second end face of the stator core is h, when h0 is larger than or equal to 20 mm, h = h0 * 0.85 + S1, and S3 is larger than or equal to 3 mm and smaller than or equal to 5 mm. When h0 is smaller than 20 mm, h = h0 + S2, and S2 is larger than or equal to 3 mm and smaller than or equal to 5 mm. Under the condition that the axial size of the motor is not changed, the axial size is substituted into a corresponding formula to calculate the distance h from the first end face to the second end face, the strength and rigidity of the rear end of the plastic coating part are increased, the noise of the motor meets the requirement, meanwhile, the material consumption of the plastic coating part is within a proper range, the production cost is reduced, and the production efficiency is improved. And the relationship between the material consumption of the plastic coating part and the motor noise can be balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a stator assembly, a motor and a household appliance. Background Art

[0002] The stator core of the plastic-encapsulated motor is encapsulated by the plastic-encapsulated part to improve production efficiency and the overall stability and reliability of the motor. However, the strength and rigidity of the plastic-encapsulated part at the rear end are weaker, and the rear end of the plastic-encapsulated part is the end away from the output end of the motor. When the motor is running, the noise of the plastic-encapsulated part at the rear end increases, and the user experience is poor. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a stator assembly that can improve the overall strength and rigidity of the plastic-coated part to reduce the noise during the operation of the motor, and can reasonably control the material usage of the plastic-coated part to reduce the production cost.

[0004] The present invention also provides a motor and a household appliance having the stator assembly.

[0005] According to a stator assembly of an embodiment of the first aspect of the present invention, applied to a motor with an end cover, the stator assembly comprises: a stator core; a plastic-coated portion, which is plastic-coated on the stator core, one end of the plastic-coated portion having an opening portion, the end face of the opening portion being provided with a stop boss arranged around the central axis of the stator core, the stop boss being used to abut and cooperate with the end cover; wherein, the opening portion is provided with a first end face located outside the stop boss, the end face of the stator core facing one end of the opening portion is a second end face, along the axial direction of the stator assembly, the height of the stator core is h0, the shortest distance between the first end face and the second end face is h, satisfying: when h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm; when h0<20mm, h=h0+S2, 3mm≤S2≤5mm.

[0006] The stator assembly according to the embodiment of the present invention has at least the following beneficial effects: By setting the plastic-coated part to be coated on the stator core, the plastic-coated part is provided with a stop boss on the end face of the opening, and the stop boss and the end cover are in abutment with each other, and the end cover plays a role of dustproof and waterproof. The height of the stator core is h0, and the distance between the first end face of the opening and the second end face of the stator core is h. When h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm. When h0<20mm, h=h0+S2, 3mm≤S2≤5mm. Therefore, when the axial size of the motor remains unchanged, the distance h from the first end face to the second end face is calculated by substituting the corresponding formula. According to the result calculated by the above formula, the height of the plastic-coated part protruding from the stator core is designed, which can increase the strength and rigidity of the rear end of the plastic-coated part, so that the noise level of the motor meets the requirements, and the material consumption of the plastic-coated part is within a suitable range, so as to reduce the production cost, which is conducive to balancing the relationship between the material consumption of the plastic-coated part and the motor noise.

[0007] According to some embodiments of the present invention, the distance h between the first end surface and the second end surface satisfies: 16 mm ≤ h ≤ 20 mm.

[0008] According to some embodiments of the present invention, the stator core includes: a plurality of punch segments arranged along the circumference of the stator core, the punch segments including magnetic conductive segments and stator teeth, the stator teeth connected to the inner side of the magnetic conductive segments, the magnetic conductive segments of adjacent punch segments are connected in sequence, a joint extending along the radial direction of the stator core is formed between two adjacent magnetic conductive segments, and the magnetic conductive segments of the plurality of punch segments are enclosed to form a yoke; a plurality of first reinforcement portions arranged at intervals along the circumference of the stator core on the outer side of the yoke, the plurality of first reinforcement portions are extended along the axial direction of the stator core, and the plurality of first reinforcement portions are respectively located on the extension lines of the corresponding joints.

[0009] According to some embodiments of the present invention, the stator core includes a plurality of axially stacked stator punching sheets, the outer walls of the stator punching sheets are provided with convex pieces, and the convex pieces of the plurality of stator punching sheets are stacked axially of the stator core to form the first reinforcement portion.

[0010] According to some embodiments of the present invention, the stator core includes a plurality of stator punching sheets stacked along the axial direction, and the stator punching sheets are configured to be made of long prefabricated punching sheets. The prefabricated punching sheets include a yoke sheet and a plurality of stator sheets. The plurality of stator sheets are connected to the same side of the yoke sheet and are arranged at intervals along the length direction of the yoke sheet. A plurality of clearance grooves are provided on the side where the yoke sheet and the stator sheet are connected. The clearance grooves are located between adjacent stator sheets. Along the length direction of the yoke sheet, the clearance grooves have two inclined surfaces arranged opposite to each other, and the angle between the two inclined surfaces is α. The maximum thickness of the yoke sheet is L, and the first reinforcement portion is configured as a protrusion protruding radially along the stator core. The maximum protrusion height of the protrusion is D, satisfying: D=L×tan(α / 2)+S3, 0.05mm≤S3≤0.5mm.

[0011] According to some embodiments of the present invention, the inner wall of the stop boss is configured as a continuous annular surface, and the annular surface is used for abutting and cooperating with the abutting portion of the end cover.

[0012] According to some embodiments of the present invention, a plurality of first mounting seats are provided on the side wall of the overmolded portion, the plurality of first mounting seats are arranged at intervals along the circumference of the stator assembly, and a first connecting hole for connecting to the end cover is provided at one end of the first mounting seat facing the stop boss.

[0013] According to some embodiments of the present invention, the first mounting seat is extended along the axial direction of the stator assembly, the first connecting hole passes through both ends of the first mounting seat along the axial direction of the stator assembly, and the first connecting hole is used to connect with the end cover and the leg of the motor.

[0014] The motor according to the second aspect of the present invention comprises the stator assembly described in the above embodiment.

[0015] The motor according to the embodiment of the present invention has at least the following beneficial effects: By adopting the stator assembly of the first aspect embodiment, the stator assembly is plastic-coated on the stator core by setting a plastic-coating part, and the plastic-coating part is provided with a stop boss on the end face of the opening, and the stop boss and the end cover are abutted and matched, and the end cover plays a role of dustproof and waterproof. The height of the stator core is h0, and the distance between the first end face of the opening and the second end face of the stator core is h. When h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm. When h0<20mm, h=h0+S2, 3mm≤S2≤5mm. Therefore, when the axial size of the motor remains unchanged, the distance h from the first end face to the second end face is calculated by substituting the corresponding formula. According to the result calculated by the above formula, the height of the plastic-coating part protruding from the stator core is designed, which can increase the strength and rigidity of the rear end of the plastic-coating part, so that the noise level of the motor meets the requirements, and the material amount of the plastic-coating part is within a suitable range to reduce production costs, which is conducive to balancing the relationship between the material amount of the plastic-coating part and the motor noise.

[0016] According to some embodiments of the present invention, the motor further comprises an end cover, wherein the end cover comprises: A bearing portion, forming a bearing chamber; An abutment portion, connected to the bearing portion and arranged around the bearing chamber, the abutment portion abuttingly matching with the inner wall of the stop boss; A positioning flange connected to the abutment portion and arranged around the abutment portion, wherein the positioning flange is positioned and matched with the end surface of the stop boss; The second reinforcement portion is provided at at least one of the bearing portion, the abutment portion and the positioning flange.

[0017] According to some embodiments of the present invention, the second reinforcement portion includes reinforcement ribs, convex ribs and reinforcement flanges, the reinforcement ribs are arranged on the end surface of the bearing portion, the convex ribs are arranged on the abutment portion, the convex ribs are provided in plurality and are arranged at intervals around the bearing chamber, and the reinforcement flange is connected to the edge of the positioning flange.

[0018] A household appliance according to an embodiment of the third aspect of the present invention comprises the motor described in the above embodiment.

[0019] The household appliance according to the embodiment of the present invention has at least the following beneficial effects: By adopting the motor of the second embodiment, the stator assembly of the motor is plastic-coated on the stator core by setting a plastic-coated part, and the plastic-coated part is provided with a stop boss on the end face of the opening, and the stop boss and the end cover are abutted and matched, and the end cover plays a role of dustproof and waterproof. The height of the stator core is h0, and the distance between the first end face of the opening and the second end face of the stator core is h. When h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm. When h0<20mm, h=h0+S2, 3mm≤S2≤5mm. Therefore, when the axial size of the motor remains unchanged, the distance h from the first end face to the second end face is calculated by substituting the corresponding formula. According to the result calculated by the above formula, the height of the plastic-coated part protruding from the stator core is designed, which can increase the strength and rigidity of the rear end of the plastic-coated part, so that the noise level of the motor meets the requirements, and the material amount of the plastic-coated part is within a suitable range to reduce production costs, which is conducive to balancing the relationship between the material amount of the plastic-coated part and the motor noise.

[0020] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 is a structural schematic diagram of a stator assembly according to an embodiment of the present invention; Figure 2 is a cross-sectional view of a stator assembly according to an embodiment of the present invention; Figure 3 It is a structural schematic diagram of the connection between the stator assembly and the legs according to an embodiment of the present invention; Figure 4 is a structural cross-sectional view of a motor according to an embodiment of the present invention; Figure 5 It is a schematic structural diagram of a prefabricated punching sheet according to an embodiment of the present invention; Figure 6 yes Figure 5 The enlarged view of point A in the middle; Figure 7 It is a structural schematic diagram of a stator punching sheet according to an embodiment of the present invention; Figure 8 yes Figure 7 The enlarged view of point B in the middle; Fig. 9 is a schematic structural diagram of a stator core according to an embodiment of the present invention; Fig.10 It is a structural schematic diagram of a stator punching sheet of another embodiment of the present invention; Fig.11 is a schematic structural diagram of a stator core according to another embodiment of the present invention; Fig.12 This is a schematic diagram of the structure of an embodiment of the present invention after the motor hides the legs; Fig.13 is a schematic structural diagram of an end cover according to an embodiment of the present invention; Fig.14 It is a cross-sectional view of an end cover of an embodiment of the present invention.

[0022] Reference numerals: Stator assembly 1000; stator core 100; second end surface 101; punching segment 110; magnetic conductive segment 111; stator tooth 112; yoke 120; joint 121; first reinforcement portion 130; protrusion 131; weld 132; stator punching sheet 150; winding 160; insulation frame 170; Prefabricated punching sheet 200; clearance groove 210; inclined surface 211; yoke sheet 220; stator sheet 230; convex sheet 240; Plastic-coated portion 300; opening portion 301; first end surface 302; stop boss 310; positioning column 311; mounting groove 320; boss 321; first mounting seat 330; first connecting hole 331; second mounting seat 340; second connecting hole 341; mounting portion 350; End cover 400; body 410; bearing portion 411; bearing chamber 412; abutment portion 413; first annular sheet 414; second annular sheet 415; positioning flange 416; second reinforcement portion 420; reinforcement rib 421; convex rib 422; reinforcement flange 423; connection portion 430; third connection hole 431; positioning hole 432; Support leg 500; positioning slot 510; fastener 520. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0024] In the description of the present invention, it is necessary to understand that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] Reference Figure 1 and Figure 2 As shown, a stator assembly 1000 of an embodiment of the present invention can be used for a motor, such as a plastic-coated motor or a drum motor. The stator assembly 1000 of the embodiment of the present invention includes a stator core 100 and a plastic-coated portion 300, the stator core 100 is sleeved with an insulating frame 170, and the winding 160 is wound on the insulating frame 170. The plastic-coated portion 300 is plastic-coated on the stator core 100, the insulating frame 170 and the winding 160, which can reduce the production and assembly steps of the stator assembly 1000 and improve production efficiency. At the same time, the plastic-coated portion 300 and the stator core 100, the insulating frame 170 and the winding 160 form a whole, which helps to reduce the mechanical vibration of the motor and reduce noise. One end of the plastic-coated portion 300 is an opening portion 301, for example, the rear end of the plastic-coated portion 300 is an opening portion 301. It can be understood that one end of the motor shaft extends out, and the other end of the shaft is still located inside the motor. Therefore, the end of the shaft extending out is the front end of the plastic-coated part 300, and the other end of the plastic-coated part 300 is the rear end. The end surface of the opening part 301 is provided with a stop boss 310 arranged around the central axis of the stator core 100, the stop boss 310 and the end cover 400 are in abutment with each other, and the inner side surface of the stop boss 310 and the inner side surface of the plastic-coated part 300 are arranged at intervals along the radial direction of the stator core 100, so the opening part 301 has an end surface on the inner side of the stop boss 310.

[0028] The opening portion 301 is provided with a first end face 302 located outside the stop boss 310, and the end face of the stator core 100 facing the opening portion 301 is the second end face 101. Along the axial direction of the stator assembly 1000, the height of the stator core 100 is h0, and the shortest distance between the first end face 302 and the second end face 101 is h, which satisfies: When h0≥20mm, h=h0×0.85+S1,3mm≤S1≤5mm; When h0<20mm, h=h0+S2, 3mm≤S2≤5mm.

[0029] By using the above formula, according to the different heights of the stator core 100, the distance h from the first end face 302 to the second end face 101 is calculated by substituting into the corresponding formula, where h reflects the height of the first end face 302 of the plastic-coated portion 300 protruding from the stator core 100. The larger h is, the higher the height of the plastic-coated portion 300 is, the more material is used in the plastic-coated portion 300, and the higher the cost is, but the overall strength and rigidity of the stator assembly 1000 are improved, which can reduce the noise during the operation of the motor. The smaller h is, the less material is used in the plastic-coated portion 300, and the lower the cost is, but the overall strength and rigidity of the stator assembly 1000 are reduced, and the noise during the operation of the motor is increased. The size of h is designed according to the result calculated by the above formula, so that the noise level of the motor meets the requirements, and the material amount of the plastic-coated portion 300 can be within a suitable range to reduce the production cost, and the relationship between the material amount of the plastic-coated portion 300 and the noise of the motor can be balanced. Since the first end surface 302 is located outside the stop boss 310 , in order to ensure the compactness of the overall structure of the motor, the height from the stop boss 310 to the first end surface 302 can be shortened to ensure that the overall height h1 of the overmolded portion 300 meets the requirements.

[0030] It should be noted that, in the motor that has not been optimized by the above formula, for example, the height h0 of the stator core 100 is 13 mm, the distance between the first end face 302 and the second end face 101 is 12 mm, and the distance between the end face of the stop boss 310 and the first end face 302 is 12.5 mm. In the motor that has been optimized by the above formula, by substituting the formula h=h0+S2, it is calculated that the value of h is between 16 mm and 18 mm, and 18 mm is taken for design. It can be seen that the height is increased by 6 mm compared to the unoptimized motor. In order not to increase the overall height h1 of the motor, the distance between the end face of the stop boss 310 and the first end face 302 can be shortened to 6.5 mm, thereby ensuring the compactness of the motor structure while increasing the strength and rigidity of the motor.

[0031] Therefore, when the height h0 of the stator core 100 is 13 mm, the following data are obtained according to the simulation experiment: Table 1: Comparison of natural frequency and rear end noise of the overmolding portion 300 at different heights

[0032] From Table 1 above, it can be seen that when the distance h between the first end face 302 and the second end face 101 is 12 mm, the natural frequency of the plastic-coated portion 300 is 1740 Hz and the noise is 48 dB. When the distance h between the first end face 302 and the second end face 101 is 16 mm, the natural frequency of the plastic-coated portion 300 is 1950 Hz and the noise is reduced to 42 dB, which is reduced by 6 decibels. It can be seen that it has a significant effect on reducing noise. When the distance h between the first end face 302 and the second end face 101 is further increased to 18 mm, the natural frequency of the plastic-coated portion 300 is 2060 Hz and the noise is reduced to 41.2 dB. Compared with the solution with h being 16 mm, the noise is reduced by 0.8 dB. When the distance h between the first end face 302 and the second end face 101 is further increased to 22 mm, the natural frequency of the plastic-coated part 300 is 2225 Hz, and the noise is reduced to 41.1 dB. Compared with the solution with h being 18 mm, the noise is reduced by 0.1 dB. It can be seen from the above data that the degree of noise reduction is greatly reduced by continuing to increase the distance h between the first end face 302 and the second end face 101. Therefore, using the above formula to calculate the height of the plastic-coated part 300 can improve the overall strength and rigidity of the plastic-coated part 300 to reduce noise; at the same time, reducing the material consumption of the plastic-coated part 300 can provide better guidance in the structural design stage of the plastic-coated part 300.

[0033] Reference Figure 2 As shown, in the embodiment of the present invention, the distance h between the first end face 302 and the second end face 101 satisfies: 16mm≤h≤20mm, for example, the value of h can be 16mm, 16.5mm, 17mm, 18mm, 19mm, 20mm, etc. When h is less than 16mm, the overall strength and rigidity of the plastic-coated part 300 are weak, and the noise at the rear end of the plastic-coated part 300 is relatively large. When h is greater than 20mm, although the overall strength and rigidity of the plastic-coated part 300 are relatively high, which can reduce the noise, the material consumption of the plastic-coated part 300 increases, and the cost is relatively high. Therefore, the reasonable design of the distance h between the first end face 302 and the second end face 101 in the range of 16mm to 20mm can balance the relationship between the material consumption of the plastic-coated part 300 and the noise of the motor, so that the noise level of the motor meets the requirements, and the material consumption of the plastic-coated part 300 can be within a suitable range to reduce the production cost.

[0034] Reference Figure 1 , Figure 3 and Figure 4As shown, in an embodiment of the present invention, the outer wall of the stop boss 310 is provided with a mounting portion 350, and the mounting portion 350 is used to mount the leg 500 of the motor. The end face of the opening portion 301 is provided with a stop boss 310, and the stop boss 310 is arranged around the central axis of the stator core 100. The inner wall of the stop boss 310 is constructed as a continuous annular surface. The motor includes an end cover 400, and the abutment portion 413 of the end cover 400 abuts and cooperates with the annular surface of the stop boss 310. Since the annular surface of the stop boss 310 is a continuous annular structure, and the abutment portion 413 of the end cover 400 abuts and cooperates with the stop boss 310, it plays a role in dustproof and waterproofing, and can also effectively block the noise inside the motor from being transmitted to the outside of the motor, further reduce the noise when the motor is running, and improve the user experience.

[0035] Reference Figure 1 As shown, in the embodiment of the present invention, the side wall of the plastic-coated part 300 is provided with a plurality of first mounting seats 330, and the plurality of first mounting seats 330 are arranged at intervals along the circumference of the stator assembly 1000, and the first mounting seat 330 is provided with a first connection hole 331 at one end facing the stop boss 310. For example, two first mounting seats 330 are provided and are integrally injection molded with the plastic-coated part 300, which can improve the stability and reliability of the connection between the first mounting seat 330 and the plastic-coated part 300. Of course, the first mounting seats 330 can also be other numbers, such as three, four, etc., and the appropriate number is selected according to the actual situation. The end cover 400 includes a connecting part 430, and the connecting part 430 is provided with a third connection hole 431. The motor also includes a fastener 520, which can be a screw, a bolt, etc. Taking a bolt as an example, the bolt is inserted into the third connection hole 431 and the first connection hole 331, and is threadedly connected by a nut and a bolt, so that the end cover 400 is fixedly connected to the plastic-coated part 300.

[0036] Reference Figure 1 and Figure 3 As shown, in an embodiment of the present invention, the mounting portion 350 is provided with a mounting groove 320, and the mounting groove 320 extends to the rear end of the stop boss 310 and the first mounting seat 330, and the mounting groove 320 is used to install the leg 500 of the motor. It is understandable that when the motor is installed in a household appliance such as a washing machine and an air conditioner, it needs to be connected to the washing machine through the leg 500. By providing the mounting groove 320, the leg 500 can be easily installed. Since the mounting groove 320 extends to the stop boss 310, the leg 500 is closer to the center of the motor, and the overall structure of the motor is more compact and occupies a small volume. At the same time, when the connecting portion 430 of the end cover 400 is connected to the plastic-coated portion 300, the same fastener 520 can be simultaneously penetrated through the first connecting hole 331, the leg 500 and the third connecting hole 431, so that the leg 500 can be fixed while the end cover 400 is installed, reducing the number of components used and improving the compactness of the motor.

[0037] Reference Figure 1 and Figure 4 As shown, in the embodiment of the present invention, the first mounting seat 330 is extended along the axial direction of the stator assembly 1000, and the first connecting hole 331 passes through both ends of the first mounting seat 330 along the axial direction of the stator assembly 1000. Figure 1 The front-to-back direction. It is understandable that when the motor is installed in the washing machine, since the motor needs to drive the drum to rotate and a large amount of water is contained in the drum, the strength and stability of the motor are required to be relatively high. To this end, by providing the first mounting seat 330 extending axially and the first connecting hole 331 axially passing through both ends of the first mounting seat 330, the stability and reliability of the connection between the leg 500 and the plastic-coated portion 300 can be effectively improved, the leg 500 can be prevented from loosening and falling off, and the safety of the motor can be improved.

[0038] Reference Figure 1 and Figure 3 As shown, in the embodiment of the present invention, the mounting portion 350 includes a boss 321, which is disposed on the bottom wall of the mounting groove 320, and the boss 321 is used to position and cooperate with the leg 500. It can be understood that in order to facilitate the relative position of the positioning leg 500 and the mounting groove 320, the leg 500 is provided with a positioning groove 510, and the boss 321 is inserted into the positioning groove 510 to determine the relative position of the leg 500 and the mounting groove 320, so as to facilitate the positioning and installation of the leg 500 and improve the installation efficiency.

[0039] Reference Figure 1 and Figure 4 As shown, in the embodiment of the present invention, the side wall of the overmolding portion 300 is provided with a second mounting seat 340, the second mounting seat 340 is extended along the axial direction of the stator assembly 1000, one end of the second mounting seat 340 is flush with the end surface of the stop boss 310 and connected to the stop boss 310, and the end of the second mounting seat 340 flush with the stop boss 310 is provided with a second connecting hole 341. For example, two first mounting seats 330 are provided, and one second mounting seat 340 is provided, and the two first mounting seats 330 and one second mounting seat 340 are spaced apart along the circumference of the overmolding portion 300, and the first mounting seat 330 and the second mounting seat 340 are both integrally formed on the overmolding portion 300. Since there are usually two legs 500, the second mounting seat 340 does not need to install the legs 500, so that one end of the second mounting seat 340 can be flush with the end surface of the stop boss 310 and connected to the stop boss 310, which can improve the overall strength and rigidity of the stop boss 310 and the plastic-coated part 300, effectively reduce the vibration of the motor, and reduce the noise generated by the motor.

[0040] Reference Figure 5 and Figure 6As shown, a prefabricated punching sheet 200 of an embodiment of the present invention is in the shape of an elongated strip. The prefabricated punching sheet 200 includes a yoke sheet 220 and a plurality of stator sheets 230, and the yoke sheet 220 is also in the shape of an elongated strip. The plurality of stator sheets 230 are connected to the same side of the yoke sheet 220, and are spaced apart along the length direction of the yoke sheet 220. A plurality of clearance grooves 210 are provided on one side of the yoke sheet 220 connected to the stator sheet 230, and the clearance grooves 210 are located between adjacent stator sheets 230. For example, a clearance groove 210 is provided between each two adjacent stator sheets 230, and the clearance groove 210 is V-shaped. It can be understood that the prefabricated punching sheet 200 needs to be bent and the two ends are connected to form Figure 7 The stator punching sheet 150 shown in FIG. 1 is stacked in the axial direction to form a plurality of stator punching sheets 150. Figure 8 Therefore, the clearance groove 210 provided on the prefabricated punching sheet 200 can make the prefabricated punching sheet 200 bend smoothly, and improve the fluency of the prefabricated punching sheet 200 when bending.

[0041] Since the connection strength of the prefabricated punching sheet 200 at the clearance groove 210 is weak and the rigidity is weak, the stator core 100 is easy to vibrate under the excitation of electromagnetic force when used in the motor, resulting in increased noise of the whole machine. Figure 7 and Figure 8 As shown, a stator core 100 of an embodiment of the present invention includes a punch segment 110 and a first reinforcement portion 130. The punch segment 110 includes a magnetic conductive segment 111 and a stator tooth 112. The magnetic conductive segment 111 can be in the shape of a straight bar or a curved arc segment. The stator tooth 112 is connected to the inner side of the magnetic conductive segment 111. The inner side of the magnetic conductive segment 111 is the side of the magnetic conductive segment 111 facing the central axis of the stator core 100. A plurality of punch segments 110 are arranged along the circumference of the stator core 100, and the magnetic conductive segments 111 of adjacent punch segments 110 are sequentially connected along the circumference of the stator core 100. A seam 121 is formed between two adjacent magnetic conductive segments 111. The seam 121 is formed by bending the clearance groove 210, and the seam 121 is extended along the radial direction of the stator core 100. The magnetic conductive segments 111 of the plurality of punch segments 110 enclose a yoke 120 , that is, the yoke 120 is ring-shaped.

[0042] The first reinforcement part 130 is connected to the outer side of the yoke part 120 and is extended along the axial direction of the stator core 100. A plurality of first reinforcement parts 130 are arranged at intervals along the circumferential direction of the stator core 100. The plurality of first reinforcement parts 130 are respectively located on the extension lines of the corresponding joints 121, that is, the first reinforcement part 130 is arranged between two adjacent magnetic conductive segments 111 and close to the joints 121, so as to increase the overall rigidity and strength of the stator core 100. Figure 8The dotted line in is an example of the extension line of the seam 121. It should be noted that the extension line of the seam 121 passes through the first reinforcement part 130, and all the extension lines of the seams 121 may pass through the corresponding first reinforcement part 130, that is, the number of seams 121 is the same as the number of first reinforcement parts 130. When the number of first reinforcement parts 130 is less than the number of seams 121, the extension lines of some seams 121 pass through the first reinforcement parts 130 at corresponding positions.

[0043] It can be understood that, by adopting the above scheme, since the first reinforcement part 130 is provided in plurality and is arranged at intervals along the circumference of the stator core 100, the first reinforcement part 130 can increase the structural strength of the stator core 100 at the joint 121 to improve the stiffness of the stator core 100, thereby reducing the noise generated by the stator core 100 due to the excitation of electromagnetic force, which can improve the user experience.

[0044] Reference Figure 6 and Fig. 9 As shown, in the embodiment of the present invention, a convex piece 240 is provided on the side of the yoke 120 of the prefabricated punching sheet 200 away from the stator sheet 230, and the convex piece 240 is located near the clearance groove 210. After the prefabricated punching sheet 200 is made into a stator punching sheet 150, a plurality of stator punching sheets 150 are stacked in the axial direction, and the convex pieces 240 are also stacked in the axial direction to form Fig. 9 The protrusion 131 shown in . Therefore, when the protrusion 131 is provided, the rigidity and strength of the yoke 120 at the joint 121 can be improved, and at the same time, the overall rigidity and strength of the stator core 100 can also be improved, so as to reduce the noise generated by the stator core 100 due to the excitation of the electromagnetic force. It should be noted that an insulating layer is provided between adjacent stator punchings 150, so as to reduce the eddy current loss of the stator core 100 and improve the overall mechanical strength and stability of the stator core 100. Therefore, adjacent convex pieces 240 are not directly connected, but are connected through an insulating layer, which reduces energy loss while improving the overall strength and rigidity of the stator core 100.

[0045] Reference Figure 7As shown, in an embodiment of the present invention, a plurality of first reinforcement parts 130 are evenly spaced along the circumference of the stator core 100. For example, the first reinforcement part 130 includes a protrusion 131, and the number of the seams 121 of the stator core 100 is 12, and a seam 121 is formed between each two adjacent stator teeth 112. The number of protrusions 131 is 6, and a protrusion 131 is provided for each seam 121. That is, the protrusion 131 and the seam 121 are provided correspondingly, and the seam 121 between each two adjacent protrusions 131 is not provided with a protrusion 131. It can be understood that the provision of the protrusion 131 will increase the force required to bend the prefabricated punching sheet 200, increase the difficulty of bending, and be unfavorable for the production of the stator punching sheet 150. Therefore, the number of protrusions 131 is reasonably designed, for example, only six are provided, to ensure that the force required to bend the prefabricated punching sheet 200 will not increase too much, and at the same time, the overall strength and rigidity of the stator core 100 can be improved. In other embodiments, the number of the protrusions 131 may be two, three, four, etc., and a suitable solution is selected according to actual conditions.

[0046] Table 2: Effect of different numbers of protrusions 131 on the natural frequency noise of the stator core 100

[0047] It should be noted that, since the stator core 100 is cylindrical, the use of the second-order elliptical mode can better reflect the natural frequency of the stator core 100. The motor tested is an 8-pole 12-slot motor, so the use of the 8th-order electromagnetic noise can more accurately reflect the size of the motor noise. As can be seen from Table 2, when the stator core 100 is not provided with a protrusion 131, the natural frequency under the second-order elliptical mode is 181Hz, and when 4 protrusions 131 are provided, the natural frequency is increased to 540Hz, and the increase is about 198.34%. At the same time, the noise is also reduced from 43dB to 41dB. When 6 protrusions 131 and 12 protrusions 131 are provided, the natural frequency of the stator core 100 can also be increased. Among them, the increase of the natural frequency when six protrusions 131 are provided is 14.8% relative to the natural frequency when four protrusions 131 are provided, and the increase of the natural frequency when 12 protrusions 131 is 19.4% relative to the natural frequency when six protrusions 131 are provided. It can be seen that the increase of the natural frequency and the decrease of the noise are slowed down. Therefore, considering the cost, manufacturing difficulty, noise level and other issues comprehensively, the number of protrusions 131 is reasonably designed, which can reduce the noise while ensuring that the manufacturing difficulty and cost of the stator core 100 will not be greatly increased.

[0048] Since the height of the protrusion 131 will affect the magnitude of the force required to bend the prefabricated punching sheet 200, in order to reasonably design the height of the protrusion 131, refer to Figure 6As shown, in the embodiment of the present invention, along the length direction of the yoke 220, the clearance groove 210 has two inclined surfaces 211 arranged opposite to each other, the angle between the two inclined surfaces 211 is α, the maximum thickness of the yoke 220 is L, and the maximum protruding height of the protrusion 131 is D, which satisfies: D=L×tan(α / 2)+S3, 0.05mm≤S3≤0.5mm, for example, the value of S3 can be 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm. It should be noted that when the yoke 220 is in the shape of multiple arcs, that is, the structure after bending is Figure 7 When the yoke 220 is in an arc shape, the maximum thickness of the yoke 220 refers to the maximum thickness along the radial direction of the stator core 100. When the yoke 220 is in a straight strip shape, that is, the yoke 120 is constructed into a polygonal structure after bending, the maximum thickness of the yoke 220 refers to the maximum thickness along the direction perpendicular to the outer wall of the yoke 220.

[0049] It is understandable that the maximum height of the protrusion 131 can be calculated by adding S3 to the value calculated based on the angle of the give way groove 210 and the maximum thickness of the yoke 220. When D is less than L×tan (α / 2) + S3, that is, the protruding height of the protrusion 131 is relatively short, it is difficult to increase the strength and rigidity of the stator core 100, and there is no obvious improvement on the noise problem. When D is greater than L×tan (α / 2) + S3, the force required to bend the prefabricated punching sheet 200 increases, the bending difficulty increases, and it is not conducive to the production of the stator punching sheet 150. Therefore, by designing D=L×tan (α / 2) + S3, it is possible to increase the strength and rigidity of the stator core 100 while ensuring that the force required to bend the prefabricated punching sheet 200 is at an appropriate size, which is conducive to the production of the stator punching sheet 150.

[0050] In an embodiment of the present invention, the maximum width W1 of the protrusion 131 can be about twice the maximum height D of the protrusion 131, for example, 1.8≤W1 / D≤2.2. When D remains unchanged, when W1 / D is less than 1.8, the maximum width of the protrusion 131 is small, and it is difficult to increase the strength and rigidity of the stator core 100, and there is no obvious improvement on the noise problem. When W1 / D is greater than 2.2, the force required to bend the prefabricated punching sheet 200 increases, and the bending difficulty increases, which is not conducive to the production of the stator punching sheet 150. Therefore, by designing the value of W1 / D to be within the range of 1.8 to 2.2, it is possible to increase the strength and rigidity of the stator core 100 while ensuring that the force required to bend the prefabricated punching sheet 200 is of an appropriate size, which is conducive to the production of the stator punching sheet 150.

[0051] Reference Figure 8As shown, in the embodiment of the present invention, along the radial direction of the stator core 100, the maximum protruding height of the protrusion 131 is D, which satisfies: 3mm≤D≤6mm, for example, the value of D is 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 6mm. It can be understood that the protruding height of the protrusion 131 will affect the magnitude of the force required to bend the prefabricated punching sheet 200. When D is less than 3mm, the protruding height of the protrusion 131 is relatively short, and it is difficult to increase the strength and rigidity of the stator core 100, and there is no obvious improvement on the noise problem. When D is greater than 6mm, the force required to bend the prefabricated punching sheet 200 increases, the bending difficulty increases, and it is not conducive to the production of the stator punching sheet 150. Therefore, by designing D in the range of 3mm to 6mm, it is possible to increase the strength and rigidity of the stator core 100 while ensuring that the force required to bend the prefabricated punching sheet 200 is at an appropriate size, which is conducive to the production of the stator punching sheet 150.

[0052] Reference Figure 8 As shown, in the embodiment of the present invention, along the circumference of the stator core 100, the maximum width of the protrusion 131 is W, which satisfies: 6mm≤W1≤12mm, for example, the value of W1 is 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm. The maximum width of the protrusion 131 will also affect the magnitude of the force required to bend the prefabricated punching sheet 200. When W1 is less than 6mm, the maximum width of the protrusion 131 is small, and it is difficult to increase the strength and rigidity of the stator core 100, and there is no obvious improvement on the noise problem. When W1 is greater than 12mm, the force required to bend the prefabricated punching sheet 200 increases, the bending difficulty increases, and it is not conducive to the production of the stator punching sheet 150. Therefore, by designing W1 within the range of 6mm to 12mm, it is possible to increase the strength and rigidity of the stator core 100 while ensuring that the force required to bend the prefabricated punching sheet 200 is at an appropriate size, which is conducive to the production of the stator punching sheet 150.

[0053] Reference Figure 7 and Figure 8 As shown, in an embodiment of the present invention, the protrusion 131 is symmetrically arranged along the extension line of the joint 121. For example, the protrusion 131 is semi-cylindrical and symmetrically arranged relative to the extension line of the joint 121, or the protrusion 131 is square columnar, triangular columnar, etc., and a suitable shape is selected according to actual conditions. By arranging the protrusion 131 symmetrically along the extension line of the joint 121, it is possible to ensure that the strength and rigidity of the stator core 100 at the joint 121 are improved, and the structural design of the protrusion 131 is reasonable, and the production is simple and convenient.

[0054] Reference Fig.10 and Fig.11As shown, in an embodiment of the present invention, the first reinforcement portion 130 can also be a weld 132. It is understandable that the stator punching sheet 150 is bent and then clamped and fixed, and then further fixed by welding. The weld 132 is usually formed during welding, and the weld 132 is located on the outside of the yoke 120 and is extended along the axial direction of the stator core 100 to improve the stability and reliability of the connection between the stator punching sheets 150. In this embodiment, a stator core 100 has a plurality of welds 132, and the plurality of welds 132 are arranged at intervals along the circumference of the stator core 100, and the weld 132 is located on the outside of the yoke 120 corresponding to the joint 121, and the extension line of the joint 121 also passes through the weld 132. It is understandable that by providing a plurality of welds 132, the overall stiffness and strength of the stator core 100 can be effectively improved, and the noise during the operation of the motor can be reduced. It should be noted that when the first reinforcement portion 130 is a weld 132, the stator core 100 can also be a block stator. It should also be noted that the solution of setting the weld 132 and the solution of setting the protrusion 131 can be applied to the same stator core 100 , for example, the weld 132 and the protrusion 131 are alternately set on the peripheral wall of the yoke 120 .

[0055] Reference Fig.10 As shown, in an embodiment of the present invention, a plurality of welds 132 are evenly spaced along the circumference of the stator core 100. For example, four welds 132 are provided, and the four welds 132 are evenly spaced on the peripheral wall of the stator core 100. Of course, there can also be three, six, etc. welds 132. It should be noted that it is not necessary for each joint 121 to be provided with a corresponding weld 132, and some joints 121 can be provided with corresponding welds 132. Of course, it is also feasible for each joint 121 to be provided with a corresponding weld 132. The appropriate solution is selected according to the actual situation. It is understandable that the more welds 132 there are, the easier it is for adjacent stator punchings 150 to be connected to each other, resulting in more magnetic leakage, and the production cost increases. At the same time, a specific number of welds 132 may cause the natural frequency of the stator core 100 to be close to the frequency when the motor is running, which worsens the noise situation. Therefore, a reasonable design of the number of welds 132 can ensure that the production cost is controlled within an appropriate range, while also improving the strength and rigidity of the stator core 100 and reducing noise.

[0056] Reference Fig.10 and Fig.11As shown, in the embodiment of the present invention, along the circumference of the stator core 100, the maximum width of the weld 132 is W2, which satisfies: 1mm≤W2≤2mm, for example, the value of W2 can be 1mm, 1.1mm, 1.3mm, 1.4mm, 1.6mm, 1.8mm, 2mm. It can be understood that the weld 132 is usually welded by a round bending welding machine, and the welding current is 70A, which easily leads to a larger width of the weld 132, usually greater than 2mm, resulting in an increase in the leakage flux of the stator core 100. Therefore, by changing the welding current to 50A, the width of the weld 132 can be reduced to stabilize it at a width of 1mm to 2mm, reducing the leakage flux and achieving a better welding effect.

[0057] An electric motor according to an embodiment of the present invention comprises the stator assembly 1000 of the above embodiment. The electric motor according to the embodiment of the present invention adopts the stator assembly 1000 of the above embodiment, and the stator core 100 is overmolded by providing the overmolding portion 300, and the overmolding portion 300 is provided with a stop boss 310 at the end face of the opening portion 301, and the stop boss 310 is abutted with the end cover 400. The height of the stator core 100 is h0, and the distance between the first end face 302 of the opening portion 301 and the second end face 101 of the stator core 100 is h. When h0≥20mm, h=h0×0.5+S1, 6mm≤S1≤10mm. When h0<20mm, h=h0×0.65+S2, 5mm≤S2≤8mm. Therefore, according to the height of the stator core 100, the distance h from the first end face 302 to the second end face 101 is calculated by substituting the corresponding formula, where h reflects the height of the plastic-coated portion 300 protruding from the stator core 100. The larger h is, the higher the height of the plastic-coated portion 300 is, the more material is used in the plastic-coated portion 300, and the cost is higher, but the overall strength and rigidity of the stator assembly 1000 are improved, which can reduce the noise during the operation of the motor. The smaller h is, the less material is used in the plastic-coated portion 300, and the cost is lower, but the overall strength and rigidity of the stator assembly 1000 are reduced, and the noise during the operation of the motor increases. Designing the size of h according to the result calculated by the above formula can balance the relationship between the material usage of the plastic-coated portion 300 and the noise of the motor, so that the noise level of the motor meets the requirements, and the material usage of the plastic-coated portion 300 is within a suitable range to reduce production costs.

[0058] Reference Fig.12 and Fig.13As shown, in the embodiment of the present invention, the motor further includes an end cover 400, the end cover 400 includes a body 410 and a second reinforcement portion 420, the body 410 includes a bearing portion 411, an abutment portion 413, a positioning flange 416 and a connection portion 430, the inner side of the bearing portion 411 is recessed to form a bearing chamber 412, the bearing chamber 412 is used to install the bearing, and one end of the motor shaft is matched with the bearing. The abutment portion 413 is connected to the edge of the bearing portion 411 and is arranged around the bearing chamber 412, and the abutment portion 413 is used to abut and cooperate with the inner side wall of the stop boss 310, so as to prevent dust, water, etc. from entering the motor through the gap between the abutment portion 413 and the stop boss 310, so as to improve the safety and stability of the motor during operation. The positioning flange 416 is connected to the edge of the abutment portion 413 and is disposed around the abutment portion 413. The positioning flange 416 is used to position and cooperate with the end surface of the stop boss 310, thereby determining the axial position between the end cover 400 and the motor. The connecting portion 430 is connected to the positioning flange 416. The connecting portion 430 is used to be fixedly connected to the overmolding portion 300, thereby fixing the relative position between the end cover 400 and the overmolding portion 300.

[0059] The second reinforcing portion 420 is provided at least one of the bearing portion 411, the abutting portion 413 and the positioning flange 416. For example, the second reinforcing portion 420 is only provided at the bearing portion 411; or the second reinforcing portion 420 is only provided at the abutting portion 413; or the second reinforcing portion 420 is only provided at the positioning flange 416; or the second reinforcing portion 420 is provided at the bearing portion 411, the abutting portion 413 and the positioning flange 416 at the same time. It can be understood that the second reinforcing portion 420 is provided at at least one of the bearing portion 411, the abutting portion 413 and the positioning flange 416, which can improve the overall strength and rigidity of the end cover 400 and reduce the noise of the motor operation.

[0060] Reference Fig.13 As shown, in an embodiment of the present invention, the second reinforcing portion 420 includes a reinforcing rib 421, and the reinforcing rib 421 is arranged on the outer end surface of the bearing portion 411. The outer end surface of the bearing portion 411 is the end surface of the bearing portion 411 that is away from the bearing chamber 412. It can be understood that since the bearing chamber 412 needs to be formed in the bearing portion 411 to install the bearing, the reinforcing rib 421 is arranged on the outer end surface of the bearing portion 411, which can avoid the reinforcing rib 421 occupying the space of the bearing chamber 412, so that the overall structure of the end cover 400 is more compact and the design is more reasonable. At the same time, the reinforcing rib 421 is arranged on the outer end surface of the bearing portion 411, which is also convenient for the stamping forming of the reinforcing rib 421 and improves the production efficiency. It should be noted that, as an alternative embodiment, the reinforcing rib 421 can also be arranged on the inner end surface, inner side surface or outer side surface of the bearing portion 411, which can also increase the overall rigidity and strength of the end cover 400 and reduce the noise when the motor is running.

[0061] Reference Fig.13and Fig.14 As shown, in the embodiment of the present invention, the outer end surface of the bearing part 411 protrudes outward to form a reinforcing rib 421, and the reinforcing rib 421 is annular and arranged around the central axis of the bearing chamber 412. For example, through a stamping process, the inner end surface of the bearing part 411 is concave, and the outer end surface is convex to form the reinforcing rib 421. Therefore, the reinforcing rib 421 and the bearing part 411 are integrally formed, which can improve the stability and reliability of the connection between the reinforcing rib 421 and the bearing part 411, and reduce the risk of the reinforcing rib 421 and the bearing part 411 loosening and falling off. It can be understood that by setting the reinforcing rib 421 on the outer end surface of the bearing part 411, the reinforcing rib 421 can be prevented from occupying the space of the bearing chamber 412, so that the overall structure of the end cover 400 is more compact and the design is more reasonable. Among them, a through hole is provided in the middle of the outer end surface of the bearing part 411, and the through hole is connected to the bearing chamber 412 and is coaxially arranged. The reinforcing rib 421 is arranged around the edge of the through hole, which is conducive to the stamping of the reinforcing rib 421 and has high production efficiency.

[0062] Reference Fig.13 As shown, in an embodiment of the present invention, the second reinforcing portion 420 includes a convex rib 422, which is arranged on the abutting portion 413, and a plurality of convex ribs 422 are provided and are arranged at intervals around the bearing chamber 412. For example, the convex rib 422 is provided on the outer wall of the abutting portion 413 to avoid occupying the space inside the motor. As an alternative embodiment, the convex rib 422 can also be provided on the inner wall of the abutting portion 413, and a suitable setting position is selected according to actual conditions. It should be noted that the inner wall of the abutting portion 413 refers to the side facing the inside of the motor, and the outer wall of the abutting portion 413 refers to the side away from the inside of the motor. The convex rib 422 can be provided with six, and the six convex ribs 422 are evenly spaced along the circumference of the bearing chamber 412. Of course, the convex rib 422 can also be other numbers, such as one, two, three, four, etc., and a suitable number is selected according to actual conditions. By providing the rib 422 on the abutting portion 413, the overall rigidity and strength of the abutting portion 413 can be enhanced, and providing multiple ribs 422 can further improve the strength of the abutting portion 413, effectively preventing the abutting portion 413 from deforming and bending. At the same time, it can also reduce the resonance with the motor, thereby reducing the noise when the motor is running.

[0063] Reference Fig.13 and Fig.14 As shown, in the embodiment of the present invention, the inner wall of the abutment portion 413 is concave, and the outer wall at the corresponding position of the abutment portion 413 protrudes outward to form a convex rib 422. Therefore, the convex rib 422 can be formed on the abutment portion 413 through a stamping process, which can improve production efficiency. Since a stamping process is adopted, the convex rib 422 is designed as a plurality of solutions, which is conducive to the molding of each convex rib 422 and improves the rationality of the structural design of the end cover 400.

[0064] Reference Fig.13As shown, in the embodiment of the present invention, the second reinforcement part 420 includes a reinforcement flange 423, and the reinforcement flange 423 is arranged at the edge of the positioning flange 416. For example, the reinforcement flange 423 is arranged around the positioning flange 416, and the reinforcement flange 423 and the positioning flange 416 are integrally formed, and the integral forming can improve the stability and reliability of the connection between the reinforcement flange 423 and the positioning flange 416. After the reinforcement flange 423 is arranged, the overall strength and rigidity of the positioning flange 416 can be improved, the resonance between the end cover 400 and the motor can be effectively reduced, and the noise when the motor is running can be reduced.

[0065] Reference Fig.13 and Fig.14 As shown, in an embodiment of the present invention, the edge of the positioning flange 416 is bent outward and extended to form a reinforcing flange 423, and the outward bending refers to the direction away from the motor, that is, bending backward. For example, during processing, the edge of the positioning flange 416 can be bent outward through a bending process to form a reinforcing flange 423. With the above scheme, the reinforcing flange 423 has low difficulty in production and manufacturing, high production efficiency, and can effectively improve the overall strength and rigidity of the positioning flange 416, and reduce the noise during motor operation. It should be noted that in another embodiment, the edge of the positioning flange 416 is bent inward to form a reinforcing flange 423, which can also improve the overall strength and rigidity of the positioning flange 416.

[0066] Reference Fig.13 As shown, in the embodiment of the present invention, the end cover 400 further includes a connecting portion 430 connected to the positioning flange 416, a plurality of connecting portions 430 are provided and arranged at intervals along the circumference of the positioning flange 416, the connecting portion 430 is used to be fixedly connected to the plastic-encapsulated stator, the reinforcing flange 423 is connected to the edge of the positioning flange 416 and to the edge of the connecting portion 430, and the reinforcing flange 423 is constructed as a continuous annular structure. Therefore, the strength and rigidity of the connecting portion 430 and the positioning flange 416 can be increased at the same time.

[0067] Reference Fig.13 and Fig.14 As shown, in the embodiment of the present invention, the inner side of the body 410 is concave, and the outer side is convex to form a bearing portion 411, and the bearing portion 411 and the abutment portion 413 are integrally formed. It should be noted that the inner side of the body 410 is the side facing the plastic-coated portion 300, and the outer side is the side away from the plastic-coated portion 300. For example, through the stamping process, one side of the middle part of the body 410 is concave, and the other side is convex to form the bearing portion 411. It can improve processing efficiency and reduce production costs.

[0068] Reference Fig.14As shown, in the embodiment of the present invention, the abutment portion 413 includes a first annular piece 414 and a second annular piece 415, the first annular piece 414 is connected to the edge of the bearing portion 411 and extends in the radial direction of the bearing chamber 412, and the second annular piece 415 is connected to the edge of the first annular piece 414 and extends in a direction away from the inner side of the first annular piece 414. The first annular piece 414 is provided with a rib 422, and the second annular piece 415 is used to abut and cooperate with the side wall of the stop boss 310. With the above solution, the abutment portion 413 has a simple structure and is easy to manufacture.

[0069] Reference Fig.13 As shown, in the embodiment of the present invention, a plurality of connecting parts 430 are provided and are arranged at intervals along the circumference of the positioning flange 416. For example, three connecting parts 430 are provided, and the three connecting parts 430 are all connected to the positioning flange 416. Of course, the connecting parts 430 can also be other quantities, such as one, two, four, five, etc. Figure 2 and Figure 3 As shown, the connecting portion 430 is provided with a first connecting hole 331, and the overmolding portion 300 includes a mounting seat, which is extended along the axial direction of the motor. The number of the mounting seats is the same as the number of the connecting portion 430, and the rear end of the mounting seat is provided with a second connecting hole 341. When installing the end cover 400, the first connecting hole 331 and the second connecting hole 341 are aligned, and then screws or bolts are inserted into the first connecting hole 331 and the second connecting hole 341, so as to fix the relative positions of the end cover 400 and the overmolding portion 300.

[0070] Reference Fig.12 and Fig.13 As shown, in the embodiment of the present invention, in order to facilitate the positioning and alignment of the first connecting hole 331 and the second connecting hole 341, a positioning hole 432 is further provided in one of the connecting parts 430, and a positioning column 311 is provided on the end face of the stop boss 310, and the positioning column 311 is inserted into the positioning hole 432, so as to determine the connection between the corresponding connecting part 430 and the corresponding mounting seat, so as to improve the assembly efficiency of the end cover 400.

[0071] Since the motor adopts all the technical solutions of the stator assembly 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0072] A household appliance of one embodiment of the present invention comprises the motor of the above embodiment, and the household appliance may be a washing machine, an air conditioner, a dehumidifier, etc. The household appliance of the embodiment of the present invention adopts the motor of the above embodiment, and the stator assembly 1000 of the motor is overmolded on the stator core 100 by setting the overmolding part 300, and the overmolding part 300 is provided with a stop boss 310 on the end face of the opening 301, and the stop boss 310 and the end cover 400 are in abutment with each other. The height of the stator core 100 is h0, and the distance between the first end face 302 of the opening 301 and the second end face 101 of the stator core 100 is h. When h0≥20mm, h=h0×0.5+S1, 6mm≤S1≤10mm. When h0<20mm, h=h0×0.65+S2, 5mm≤S2≤8mm. Therefore, according to the height of the stator core 100, the distance h from the first end face 302 to the second end face 101 is calculated by substituting the corresponding formula, where h reflects the height of the plastic-coated portion 300 protruding from the stator core 100. The larger h is, the higher the height of the plastic-coated portion 300 is, the more material is used in the plastic-coated portion 300, and the cost is higher, but the overall strength and rigidity of the stator assembly 1000 are improved, which can reduce the noise during the operation of the motor. The smaller h is, the less material is used in the plastic-coated portion 300, and the cost is lower, but the overall strength and rigidity of the stator assembly 1000 are reduced, and the noise during the operation of the motor increases. Designing the size of h according to the result calculated by the above formula can balance the relationship between the material usage of the plastic-coated portion 300 and the noise of the motor, so that the noise level of the motor meets the requirements, and the material usage of the plastic-coated portion 300 is within a suitable range to reduce production costs.

[0073] Since the household appliance adopts all the technical solutions of the motor of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0074] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A stator assembly, applied to a motor with an end cover, characterized in that: The stator assembly comprises: stator core; A plastic-coated portion, which is coated on the stator core, wherein one end of the plastic-coated portion has an opening, and an end surface of the opening is provided with a stop boss arranged around the central axis of the stator core, wherein the stop boss is used to abut and cooperate with the end cover; The opening portion is provided with a first end face located outside the stop boss, the end face of the stator core facing the opening portion is the second end face, along the axial direction of the stator assembly, the height of the stator core is h0, the shortest distance between the first end face and the second end face is h, and the following conditions are satisfied: When h0≥20mm, h=h0×0.85+S1,3mm≤S1≤5mm; When h0<20mm, h=h0+S2, 3mm≤S2≤5mm.

2. The stator assembly according to claim 1, characterized in that: A distance h between the first end surface and the second end surface satisfies: 16 mm ≤ h ≤ 20 mm.

3. The stator assembly according to claim 1, characterized in that: The stator core comprises: A plurality of punch segments are arranged along the circumference of the stator core, the punch segments include magnetic conductive segments and stator teeth, the stator teeth are connected to the inner side of the magnetic conductive segments, the magnetic conductive segments of adjacent punch segments are connected in sequence, a seam extending along the radial direction of the stator core is formed between two adjacent magnetic conductive segments, and the magnetic conductive segments of the plurality of punch segments are enclosed to form a yoke; A plurality of first reinforcement parts are arranged at intervals along the circumferential direction of the stator core on the outer side of the yoke part, the plurality of first reinforcement parts are extended along the axial direction of the stator core, and the plurality of first reinforcement parts are respectively located on the extension lines of the corresponding joints.

4. The stator assembly according to claim 3, characterized in that: The stator core includes a plurality of stator punching sheets stacked in the axial direction, and the outer walls of the stator punching sheets are provided with convex pieces. The convex pieces of the plurality of stator punching sheets are stacked in the axial direction of the stator core to form the first reinforcement portion.

5. The stator assembly according to claim 3, characterized in that: The stator core includes a plurality of stator punching sheets stacked along the axial direction, and the stator punching sheets are configured to be made of long prefabricated punching sheets. The prefabricated punching sheets include a yoke sheet and a plurality of stator sheets. The plurality of stator sheets are connected to the same side of the yoke sheet and are arranged at intervals along the length direction of the yoke sheet. A plurality of clearance grooves are provided on the side where the yoke sheet and the stator sheet are connected. The clearance grooves are located between adjacent stator sheets. Along the length direction of the yoke sheet, the clearance grooves have two inclined surfaces arranged opposite to each other, and the angle between the two inclined surfaces is α. The maximum thickness of the yoke sheet is L, and the first reinforcement portion is configured as a protrusion protruding radially along the stator core. The maximum protrusion height of the protrusion is D, satisfying: D=L×tan(α / 2)+S3, 0.05mm≤S3≤0.5mm.

6. The stator assembly according to claim 1, characterized in that: The inner wall of the stop boss is configured as a continuous annular surface, and the annular surface is used for abutting and cooperating with the abutting portion of the end cover.

7. The stator assembly according to claim 1, characterized in that: A plurality of first mounting seats are provided on the side wall of the overmolded portion, and the plurality of first mounting seats are arranged at intervals along the circumference of the stator assembly. One end of the first mounting seat facing the stop boss is provided with a first connecting hole for connecting with the end cover.

8. The stator assembly according to claim 7, characterized in that: The first mounting seat is extended along the axial direction of the stator assembly, the first connecting hole passes through both ends of the first mounting seat along the axial direction of the stator assembly, and the first connecting hole is used to connect with the end cover and the legs of the motor.

9. The motor is characterized by: The invention comprises an end cover and the stator assembly according to any one of claims 1 to 8, wherein the end cover is installed at the opening portion.

10. The motor according to claim 9, characterized in that The motor further comprises an end cover, wherein the end cover comprises: A bearing portion, forming a bearing chamber; An abutment portion, connected to the bearing portion and arranged around the bearing chamber, the abutment portion abuttingly matching with the inner wall of the stop boss; A positioning flange connected to the abutment portion and arranged around the abutment portion, wherein the positioning flange is positioned and matched with the end surface of the stop boss; The second reinforcement portion is provided at at least one of the bearing portion, the abutment portion and the positioning flange.

11. The motor according to claim 10, characterized in that The second reinforcement portion includes reinforcement ribs, convex ribs and reinforcement flanges. The reinforcement ribs are arranged on the end surface of the bearing portion, the convex ribs are arranged on the abutment portion, a plurality of convex ribs are provided and are arranged at intervals around the bearing chamber, and the reinforcement flange is connected to the edge of the positioning flange.

12. A household appliance, characterized in that: A motor comprising the motor according to any one of claims 9 to 11.

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