Stator assembly, motor and household appliance

Abstract

The utility model discloses a stator assembly, a motor and a household electrical 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 utility model relates to motor technical field, in particular to a kind of stator assembly, motor and household appliance. BACKGROUND

[0002] The stator core of plastic package motor is plastic-wrapped by plastic wrapping part to improve production efficiency, and the stability and reliability of the whole motor can be improved. However, the strength and rigidity of the plastic wrapping part at the rear end are weak, and the rear end of the plastic wrapping part is the end away from the output end of the motor. When the motor is running, the noise of the plastic wrapping part at the rear end increases, and the user experience is poor. SUMMARY

[0003] The utility model at least solves one of the technical problems existing in the prior art. To this end, the utility model provides a stator assembly, which can improve the overall strength and rigidity of the plastic wrapping part to reduce the noise when the motor is running, and can reasonably control the material consumption of the plastic wrapping part to reduce the production cost.

[0004] The utility model further provides a motor and household appliance with the above stator assembly.

[0005] According to the stator assembly of the first aspect of the utility model, the stator assembly is applied to a motor with an end cover, and the stator assembly comprises a stator core, a plastic wrapping part wrapped around the stator core, one end of the plastic wrapping part having an opening part, the end face of the opening part being provided with a stop flange around the central axis of the stator core, and the stop flange being used for abutting and cooperating with the end cover. The opening part is provided with a first end face outside the stop flange, the end face of one end of the stator core facing the opening part is a second end face, the height of the stator core is h0 along the axial direction of the stator assembly, the shortest distance between the first end face and the second end face is h, and the following conditions are met: 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 utility model embodiment has at least the following beneficial effects:

[0007] The plastic wrapping part is arranged on the stator core, the plastic wrapping part is provided with a stop boss on the end face of the opening part, the stop boss is in abutting fit with the end cover, and the end cover plays a role of dustproof and waterproof. 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 greater than or equal to 20 mm, h = h0*0.85 + S1, 3 mm ≤ S1 ≤ 5 mm. When h0 is less than 20 mm, h = h0 + S2, 3 mm ≤ S2 ≤ 5 mm. Therefore, the distance h between the first end face and the second end face is calculated according to the corresponding formula under the condition that the axial dimension of the motor is unchanged. According to the calculation result of the formula, the height of the plastic wrapping part protruding from the stator core is designed, the strength and rigidity of the rear end of the plastic wrapping part are increased, the noise of the motor meets the requirements, the material consumption of the plastic wrapping part is in a proper range, the production cost is reduced, and the relationship between the material consumption of the plastic wrapping part and the noise of the motor is balanced.

[0008] According to some embodiments of the present application, the distance h between the first end face and the second end face satisfies: 16 mm ≤ h ≤ 20 mm.

[0009] According to some embodiments of the present application, the stator core comprises: a plurality of punching segments arranged along the circumference of the stator core, the punching segment comprising a magnetic conducting segment and a stator tooth, the stator tooth being connected to the inner side of the magnetic conducting segment, the magnetic conducting segments of adjacent punching segments being sequentially connected, a joint extending along the radial direction of the stator core being formed between two adjacent magnetic conducting segments, and the magnetic conducting segments of a plurality of punching segments enclosing a yoke portion; a plurality of first reinforcing portions being arranged on the outer side of the yoke portion along the circumference of the stator core, the plurality of first reinforcing portions being arranged along the axial direction of the stator core, and the plurality of first reinforcing portions being respectively located on the extension lines of the corresponding joints.

[0010] According to some embodiments of the present application, the stator core comprises a plurality of stator punching segments stacked along the axial direction, the outer wall of the stator punching segment being provided with a tab, and the tabs of the plurality of stator punching segments being stacked along the axial direction of the stator core to form the first reinforcing portion.

[0011] According to some embodiments of the utility model, the stator core includes a plurality of axially stacked stator laminations, the stator laminations are configured to be made of long strip-shaped prefabricated laminations, the prefabricated laminations include a yoke and a plurality of stator sheets, the plurality of stator sheets are connected to the same side of the yoke and are arranged at intervals along the length direction of the yoke, the side where the yoke and the stator sheets are connected is provided with a plurality of accommodation grooves, the accommodation grooves are located between adjacent stator sheets, along the length direction of the yoke, the accommodation grooves have two oppositely arranged inclined surfaces, the included angle between the two inclined surfaces is α, the maximum thickness of the yoke is L, the first reinforcing part is configured as a protrusion protruding in the radial direction of the stator core, the maximum protrusion height of the protrusion is D, and the following conditions are met: D = L * tan (α / 2) + S3, 0.05mm ≤ S3 ≤ 0.5mm.

[0012] According to some embodiments of the utility model, the inner wall of the stop protrusion is configured as a continuous annular surface, and the annular surface is used for abutting connection with the abutting part of the end cover.

[0013] According to some embodiments of the utility model, the side wall of the plastic-coated part is provided with a plurality of first mounting seats, the plurality of first mounting seats are arranged at intervals along the circumferential direction of the stator assembly, and one end of the first mounting seat towards the stop protrusion is provided with a first connecting hole used for connecting with the end cover.

[0014] According to some embodiments of the utility model, the first mounting seat extends along the axial direction of the stator assembly, the first connecting hole penetrates through both ends of the first mounting seat along the axial direction of the stator assembly, and the first connecting hole is used for connecting with the end cover and the leg of the motor.

[0015] The motor according to the second aspect of the utility model comprises the stator assembly according to the above embodiments.

[0016] The motor according to the embodiments of the utility model has at least the following beneficial effects:

[0017] By adopting the stator assembly of the first aspect embodiment, the stator assembly is wrapped in the stator core by the wrapping part, the wrapping part is provided with the stopper boss on the end face of the opening part, the stopper boss and the end cover are in abutting fit, and the end cover plays a role of dustproof and waterproof. 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 greater than or equal to 20 mm, h = h0 x 0.85 + S1, 3 mm ≤ S1 ≤ 5 mm. When h0 is less than 20 mm, h = h0 + S2, 3 mm ≤ S2 ≤ 5 mm. Therefore, in the case that the axial dimension of the motor is unchanged, the distance h from the first end face to the second end face is calculated according to the corresponding formula. According to the calculation result of the formula, the height of the wrapping part protruding from the stator core is designed, the strength and rigidity of the rear end of the wrapping part are increased, the noise of the motor meets the requirements, the material consumption of the wrapping part is in a proper range, the production cost is reduced, and the relationship between the material consumption of the wrapping part and the noise of the motor is balanced.

[0018] According to some embodiments of the present application, the motor further comprises an end cover, the end cover comprises:

[0019] a bearing part forming a bearing chamber;

[0020] an abutting part connected to the bearing part and arranged around the bearing chamber, the abutting part and the inner wall of the stopper boss are in abutting fit;

[0021] a positioning flange connected to the abutting part and arranged around the abutting part, the positioning flange and the end face of the stopper boss are in positioning fit;

[0022] a second reinforcing part arranged at least one of the bearing part, the abutting part and the positioning flange.

[0023] According to some embodiments of the present application, the second reinforcing part comprises a reinforcing rib, a protruding rib and a reinforcing flange, the reinforcing rib is arranged on the end face of the bearing part, the protruding rib is arranged on the abutting part, the protruding rib is provided with a plurality of and is arranged around the bearing chamber, and the reinforcing flange is connected to the edge of the positioning flange.

[0024] The household appliance according to the third aspect embodiment of the present application comprises the motor according to the above embodiments.

[0025] The household appliance according to the embodiments of the present application has at least the following beneficial effects:

[0026] By adopting the motor of the second aspect embodiment, the stator assembly of the motor is plasticized in the stator core through the plastic wrapping part, the plastic wrapping part is provided with a stop boss at the end face of the opening part, the stop boss and the end cover are in abutting fit, and the end cover plays a role of dustproof and waterproof. 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≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm. When h0<20mm, h=h0+S2, 3mm≤S2≤5mm. Therefore, in the case that the axial dimension of the motor is unchanged, the distance h from the first end face to the second end face is calculated according to the corresponding formula. According to the calculation result of the formula, the height of the plastic wrapping part protruding from the stator core is designed, the strength and rigidity of the rear end of the plastic wrapping part are increased, the noise size of the motor meets the requirements, and meanwhile, the material consumption of the plastic wrapping part is in a proper range, so that the production cost is reduced, and the relationship between the material consumption of the plastic wrapping part and the noise of the motor is balanced.

[0027] Additional aspects and advantages of the present application will be made apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings and embodiments, wherein:

[0029] Figure 1 is a structural schematic view of a stator assembly of an embodiment of the present application;

[0030] Figure 2 is a sectional view of the stator assembly of an embodiment of the present application;

[0031] Figure 3 is a structural schematic view of the connection of the stator assembly and the supporting leg of an embodiment of the present application;

[0032] Figure 4 is a structural sectional view of a motor of an embodiment of the present application;

[0033] Figure 5 is a structural schematic view of a prefabricated punching sheet of an embodiment of the present application;

[0034] Figure 6 is Figure 5 is an enlarged view of A in FIG. 8;

[0035] Figure 7 is a structural schematic view of a stator punching sheet of an embodiment of the present application;

[0036] Figure 8 is Figure 7 is an enlarged view of B in FIG. 8;

[0037] Figure 9 is a structure schematic view of a stator core of an embodiment of the utility model;

[0038] Figure 10 is a structure schematic view of a stator lamination of another embodiment of the utility model;

[0039] Figure 11 is a structure schematic view of a stator core of another embodiment of the utility model;

[0040] Figure 12 is a structure schematic view of a motor after a supporting leg of an embodiment of the utility model is hidden;

[0041] Figure 13 is a structure schematic view of an end cover of an embodiment of the utility model;

[0042] Figure 14 is a sectional view of an end cover of an embodiment of the utility model.

[0043] Reference signs:

[0044] Stator assembly 1000;

[0045] Stator core 100;Second end surface 101;Lamination segment 110;Magnetic conducting segment 111;Stator tooth 112;Yoke portion 120;Joint 121;First reinforcing portion 130;Protrusion 131;Weld 132;Stator lamination 150;Winding 160;Insulating frame 170;

[0046] Prefabricated lamination 200;Let go of groove 210;Bevel 211;Yoke piece 220;Stator piece 230;Tab 240;

[0047] Plastic-coated portion 300;Opening portion 301;First end surface 302;Stop opening boss 310;Positioning column 311;Mounting groove 320;Protruding column 321;First mounting seat 330;First connecting hole 331;Second mounting seat 340;Second connecting hole 341;Mounting portion 350;

[0048] End cover 400;Body 410;Bearing portion 411;Bearing chamber 412;Butt joint portion 413;First annular piece 414;Second annular piece 415;Positioning flange 416;Second reinforcing portion 420;Reinforcing rib 421;Protruding rib 422;Reinforcing flange 423;Connecting portion 430;Third connecting hole 431;Positioning hole 432;

[0049] Supporting leg 500;Positioning groove 510;Fastener 520. Specific implementation

[0050] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent 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 only, are for the purpose of explanation only and are not to be construed as limiting the present application.

[0051] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by the upper, lower, front, rear, left, right and the like is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated 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.

[0052] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than and the like are understood as not including the number, above, below, within and the like are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the order of indicated technical features.

[0053] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting and the like should be broadly understood, and the skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0054] Referring to Figure 1 and Figure 2As shown, the stator assembly 1000 of the embodiment of the utility model can be used for motor, such as plastic package motor or drum motor. The stator assembly 1000 of the embodiment of the utility model comprises stator core 100 and plastic package part 300, the stator core 100 is sleeved with insulation frame 170, and winding 160 is wound on insulation frame 170. The plastic package part 300 is plastic packaged on stator core 100, insulation frame 170 and winding 160, which can reduce the production and assembly steps of stator assembly 1000 and improve production efficiency. At the same time, plastic package part 300 and stator core 100, insulation frame 170 and winding 160 constitute an integral whole, which helps to reduce mechanical vibration of motor and reduce noise. One end of plastic package part 300 is open part 301, for example, the rear end of plastic package part 300 is open part 301. It can be understood that one end of the rotating shaft of the motor protrudes, and the other end of the rotating shaft is still located in the motor. Therefore, the end of the rotating shaft protruding is the front end of the plastic package part 300, and the other end of the plastic package part 300 is the rear end. The end face of open part 301 is provided with a stop boss 310 arranged around the central axis of stator core 100, the stop boss 310 and the end cover 400 abut and cooperate, and the inner side surface of the stop boss 310 and the inner side surface of the plastic package part 300 are arranged along the radial direction of the stator core 100, so that the open part 301 has an end face on the inner side of the stop boss 310.

[0055] Wherein, the open part 301 is provided with a first end face 302 located outside the stop boss 310, the end face of one end of the stator core 100 towards the open part 301 is a second end face 101, along the axial direction of the stator assembly 1000, the height of the stator core 100 is h0, the shortest distance between the first end face 302 and the second end face 101 is h, and the following conditions are met:

[0056] When h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm;

[0057] When h0<20mm, h=h0+S2, 3mm≤S2≤5mm.

[0058] According to the above formula, the distance h from the first end surface 302 to the second end surface 101 is calculated according to the height of the stator core 100, and h reflects the height of the first end surface 302 of the plastic-coated portion 300 protruding from the stator core 100. The greater h is, the higher the plastic-coated portion 300 is, the more material is used for the plastic-coated portion 300, and the higher the cost is, but the overall strength and rigidity of the stator assembly 1000 are improved, and the noise of the motor during operation is reduced. The smaller h is, the less material is used for 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 of the motor during operation is increased. According to the calculation result of the above formula, the size of h is designed so that the noise of the motor meets the requirements, and at the same time, the material usage of the plastic-coated portion 300 is within an appropriate range to reduce production costs, and the relationship between the material usage of the plastic-coated portion 300 and the noise of the motor is 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 overall height h1 of the plastic-coated portion 300 can be ensured to meet the requirements by shortening the height from the stop boss 310 to the first end surface 302.

[0059] It should be noted that in the motor that is not optimized by the above formula, for example, the height h0 of the stator core 100 is 13 mm, the distance between the first end surface 302 and the second end surface 101 is 12 mm, and the distance between the end surface of the stop boss 310 and the first end surface 302 is 12.5 mm. In the motor optimized by the above formula, the value of h is calculated to be between 16 mm and 18 mm by substituting the formula h = h0 + S2, and 18 mm is designed, which increases the height of the motor by 6 mm compared to the motor that is not optimized. In order to not increase the overall height h1 of the motor, the distance between the end surface of the stop boss 310 and the first end surface 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.

[0060] Therefore, in the case where the height h0 of the stator core 100 is 13 mm, the following data is obtained according to the simulation experiment:

[0061] Table 1: Comparison of inherent frequency and rear-end noise of plastic-coated portion 300 with different heights

[0062]

[0063] From the above table 1, the distance h between the first end surface 302 and the second end surface 101 is 12mm, the inherent frequency of the plastic coated part 300 is 1740Hz, and the noise is 48dB. When the distance h between the first end surface 302 and the second end surface 101 is 16mm, the inherent frequency of the plastic coated part 300 is 1950Hz, and the noise is reduced to 42dB, which is reduced by 6dB. It can be known that it has a significant effect on reducing noise. When the distance h between the first end surface 302 and the second end surface 101 is continuously increased to 18mm, the inherent frequency of the plastic coated part 300 is 2060Hz, and the noise is reduced to 41.2dB, which is reduced by 0.8dB compared with the scheme of h being 16mm. When the distance h between the first end surface 302 and the second end surface 101 is continuously increased to 22mm, the inherent frequency of the plastic coated part 300 is 2225Hz, and the noise is reduced to 41.1dB, which is reduced by 0.1dB compared with the scheme of h being 18mm. From the above data, it can be known that the increase of the distance h between the first end surface 302 and the second end surface 101 has a great reduction in the degree of noise reduction. Therefore, the height of the plastic coated part 300 is calculated by using the above formula, which can improve the overall strength and rigidity of the plastic coated part 300 to reduce noise; at the same time, the material consumption of the plastic coated part 300 is reduced, which can provide better guidance in the structural design stage of the plastic coated part 300.

[0064] With reference to Figure 2 In the embodiment of the utility model, the distance h between the first end surface 302 and the second end surface 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 large. When h is greater than 20mm, although the overall strength and rigidity of the plastic coated part 300 are high, which can reduce noise, the material consumption of the plastic coated part 300 is increased, and the cost is high. Therefore, the distance h between the first end surface 302 and the second end surface 101 is reasonably designed in 16mm to 20mm, which can balance the relationship between the material consumption of the plastic coated part 300 and the motor noise, so that the noise of the motor meets the requirements, and at the same time, the material consumption of the plastic coated part 300 is in a suitable range, so as to reduce the production cost.

[0065] With reference to Figure 1 , Figure 3 and Figure 4As shown, in the embodiment of the utility model, the outer wall of the stop protrusion 310 is provided with a mounting portion 350, and the mounting portion 350 is used for mounting the leg 500 of the motor. The end surface of the opening portion 301 is provided with the stop protrusion 310, and the stop protrusion 310 is arranged around the central axis of the stator core 100. The inner wall of the stop protrusion 310 is configured as a continuous annular surface. The motor comprises an end cover 400, and the abutting portion 413 of the end cover 400 and the annular surface of the stop protrusion 310 are in abutting cooperation. Since the annular surface of the stop protrusion 310 is a continuous annular structure, and the abutting portion 413 of the end cover 400 and the stop protrusion 310 are in abutting cooperation, the dustproof and waterproof effect is achieved, and the noise in the motor can be effectively blocked from being transmitted to the outside of the motor, further reducing the noise during the operation of the motor and improving the user experience.

[0066] Referring to Figure 1 As shown, in the embodiment of the utility model, the side wall of the plastic-coated part 300 is provided with a plurality of first mounting seats 330, the plurality of first mounting seats 330 are arranged at intervals along the circumference of the stator assembly 1000, and the end of the first mounting seat 330 towards the stop protrusion 310 is provided with a first connecting hole 331. For example, the first mounting seat 330 is provided with two and is 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 seat 330 can also be other quantities, such as three, four, etc., and the appropriate number is selected according to the actual situation. The end cover 400 comprises a connecting portion 430, and the connecting portion 430 is provided with a third connecting hole 431. The motor further comprises a fastener 520, which can be a screw, a bolt, etc. Taking the bolt as an example, the bolt is arranged in the third connecting hole 431 and the first connecting hole 331, and is threadedly connected through a nut and the bolt, so as to fixedly connect the end cover 400 to the plastic-coated part 300.

[0067] Referring to Figure 1 and Figure 3 As shown, in the embodiment of the utility model, the mounting portion 350 is provided with a mounting groove 320, and the mounting groove 320 extends to the rear end of the stop protrusion 310 and the first mounting seat 330, and the mounting groove 320 is used for mounting the leg 500 of the motor. It can be understood that when the motor is installed in a household appliance such as a washing machine or an air conditioner, the leg 500 needs to be connected to the washing machine. By arranging the mounting groove 320, the leg 500 can be conveniently installed. Since the mounting groove 320 extends to the stop protrusion 310, the leg 500 is closer to the center of the motor, the overall structure of the motor is more compact, and the occupied volume is small. At the same time, when the connecting portion 430 of the end cover 400 is connected to the plastic-coated part 300, the same fastener 520 can be arranged in the first connecting hole 331, the leg 500 and the third connecting hole 431 at the same time, so that the end cover 400 can be installed while the leg 500 is fixed, reducing the number of parts used and improving the compactness of the motor.

[0068] With reference to Figure 1 and Figure 4 shown, in the embodiment of the utility model, first mounting seat 330 along the axial extension of stator assembly 1000 setting, first connecting hole 331 along the axial direction of stator assembly 1000 through the both ends of first mounting seat 330. The axial direction of stator assembly 1000 is also the front-back direction in Figure 1 It can be understood that when the motor is installed in the washing machine, because the motor needs to drive the drum to rotate, the drum contains a large amount of water, so the strength and stability of the motor are required to be higher. Therefore, by setting the first mounting seat 330 to extend in the axial direction, and the axial direction of the first connecting hole 331 through the both ends of the first mounting seat 330, the stability and reliability of the connection between the supporting leg 500 and the plastic-coated part 300 can be effectively improved, the supporting leg 500 is prevented from loosening and falling off, and the safety of the motor is improved.

[0069] With reference to Figure 1 and Figure 3 shown, in the embodiment of the utility model, mounting part 350 includes convex column 321, convex column 321 is located in the bottom wall of mounting groove 320, convex column 321 is used for positioning cooperation with supporting leg 500. It can be understood that in order to facilitate the relative position of the supporting leg 500 and the mounting groove 320, the supporting leg 500 is provided with a positioning groove 510, and the convex column 321 is inserted into the positioning groove 510 to determine the relative position of the supporting leg 500 and the mounting groove 320, so as to facilitate the positioning and installation of the supporting leg 500 and improve the installation efficiency.

[0070] With reference to Figure 1 and Figure 4 shown, in the embodiment of the utility model, the side wall of plastic-coated part 300 is provided with second mounting seat 340, second mounting seat 340 along the axial extension of stator assembly 1000 setting, one end of second mounting seat 340 and the end face of stop flange 310 flush and connected with stop flange 310, second mounting seat 340 and stop flange 310 flush one end is equipped with second connecting hole 341. For example, the first mounting seat 330 is provided with two, the second mounting seat 340 is provided with one, the two first mounting seats 330 and the second mounting seat 340 are arranged along the circumference of the plastic-coated part 300, and the first mounting seat 330 and the second mounting seat 340 are integrally formed on the plastic-coated part 300. Since the supporting leg 500 is usually two, the second mounting seat 340 does not need to install the supporting leg 500, so that one end of the second mounting seat 340 can be flush with the end face of the stop flange 310 and connected with the stop flange 310, the overall strength and rigidity of the stop flange 310 and the plastic-coated part 300 can be improved, the vibration of the motor can be effectively reduced, and the noise generated by the motor can be reduced.

[0071] With reference to Figure 5 and Figure 6As shown in the utility model, the prefabricated punching sheet 200 is in a strip shape. The prefabricated punching sheet 200 comprises a yoke sheet 220 and a plurality of stator sheets 230, and the yoke sheet 220 is also in a strip shape. The plurality of stator sheets 230 are connected to the same side of the yoke sheet 220 and are arranged at intervals along the length direction of the yoke sheet 220. The side of the yoke sheet 220, to which the stator sheets 230 are connected, is provided with a plurality of accommodation grooves 210, and the accommodation grooves 210 are located between adjacent stator sheets 230. For example, one accommodation groove 210 is arranged between every two adjacent stator sheets 230, and the accommodation groove 210 is in a V shape. It can be understood that the prefabricated punching sheet 200 needs to be bent and connected at both ends, so as to form the stator punching sheet 150 shown in Figure 7 and the plurality of stator punching sheets 150 are stacked along the axial direction, so as to form the stator core 100 shown in Figure 8 . Therefore, the accommodation grooves 210 arranged on the prefabricated punching sheet 200 can make the prefabricated punching sheet 200 bend smoothly, and improve the smoothness when the prefabricated punching sheet 200 is bent.

[0072] Since the connection strength of the prefabricated punching sheet 200 at the accommodation groove 210 is weak and the rigidity is weak, the stator core 100 is easy to vibrate under the excitation of electromagnetic force when the prefabricated punching sheet 200 is applied to a motor, which leads to the increase of the noise of the whole machine. In order to solve the problem of large noise, referring to Figure 7 and Figure 8 , the utility model discloses a stator core 100, which comprises a punching sheet segment 110 and a first reinforcing part 130. The punching sheet segment 110 comprises a magnetic conduction segment 111 and a stator tooth 112. The magnetic conduction segment 111 can be in a straight strip shape or a curved arc segment. The stator tooth 112 is connected to the inner side of the magnetic conduction segment 111, and the inner side of the magnetic conduction segment 111 is the side of the magnetic conduction segment 111 facing the central axis of the stator core 100. A plurality of punching sheet segments 110 are arranged in the circumferential direction of the stator core 100, and the magnetic conduction segments 111 of adjacent punching sheet segments 110 are sequentially connected in the circumferential direction of the stator core 100. A joint 121 is formed between two adjacent magnetic conduction segments 111, and the joint 121 is formed after the accommodation groove 210 is bent and is arranged in the radial direction of the stator core 100. The magnetic conduction segments 111 of the plurality of punching sheet segments 110 enclose a yoke part 120, i.e., the yoke part 120 is in a ring shape.

[0073] The first reinforcing part 130 is connected to the outer side of the yoke part 120 and is arranged in the axial direction of the stator core 100. A plurality of first reinforcing parts 130 are arranged at intervals in the circumferential direction of the stator core 100. Among them, the plurality of first reinforcing parts 130 are located on the extension lines of the corresponding joints 121, i.e., the first reinforcing part 130 is arranged at the position between two adjacent magnetic conduction segments 111 close to the joint 121, so as to increase the overall rigidity and strength of the stator core 100. Figure 8The dashed line in the figure is an example of the extension line of the joint 121. It should be noted that the extension line of the joint 121 passes through the first reinforcing portion 130. The extension line of all the joints 121 can pass through the corresponding first reinforcing portion 130, that is, the number of joints 121 is the same as the number of first reinforcing portions 130. When the number of first reinforcing portions 130 is less than the number of joints 121, the extension line of part of the joints 121 passes through the first reinforcing portion 130 at the corresponding position.

[0074] It can be understood that, by using the above scheme, since the first reinforcing portion 130 is provided in plurality and is arranged at intervals in the circumferential direction of the stator core 100, the first reinforcing portion 130 can increase the structural strength of the stator core 100 at the joint 121, so as to improve the rigidity of the stator core 100, thereby reducing the noise generated by the excitation of the electromagnetic force of the stator core 100, and the user experience can be improved.

[0075] Referring to FIGS. 1, 2 and 3, Figure 6 and Figure 9 In the embodiment of the utility model, the yoke portion 120 of the prefabricated punching sheet 200 is provided with a tab 240 on the side away from the stator sheet 230, and the tab 240 is located near the accommodation groove 210. After the prefabricated punching sheet 200 is made into the stator punching sheet 150, a plurality of stator punching sheets 150 are stacked in the axial direction, and the tabs 240 are also stacked in the axial direction to form the protrusion 131 shown in FIG. 1. Figure 9 Therefore, the protrusion 131 can improve the rigidity and strength of the yoke portion 120 at the joint 121, and the overall rigidity and strength of the stator core 100 can also be improved, so as to reduce the noise generated by the excitation of the electromagnetic force of the stator core 100. It should be noted that an insulating layer is arranged between the adjacent stator punching sheets 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, the adjacent tabs 240 are not directly connected, but are connected through the insulating layer, which can improve the overall strength and rigidity of the stator core 100 while reducing energy loss.

[0076] Referring to FIGS. 1, 2 and 3, Figure 7As shown, in the embodiment of the utility model, multiple first reinforcing portions 130 are evenly spaced along the circumference of the stator core 100. For example, the first reinforcing portion 130 includes a protrusion 131, and the number of joints 121 of the stator core 100 is 12, and a joint 121 is formed between every two adjacent stator teeth 112. The number of protrusions 131 is 6, and a protrusion 131 is provided every other joint 121. That is, the protrusion 131 and the joint 121 are correspondingly arranged, and no protrusion 131 is arranged between every two adjacent protrusions 131. It can be understood that the setting of the protrusion 131 will increase the force required for bending the preformed stamping 200 and increase the bending difficulty, which is not conducive to the production of the stator stamping 150. Therefore, the number of protrusions 131 is reasonably designed, for example, only six are provided, to ensure that the force required for bending the preformed stamping 200 will not increase too much, while the overall strength and rigidity of the stator core 100 can be improved. In other embodiments, the number of protrusions 131 can also be two, three, four, etc., and the appropriate scheme is selected according to the actual situation.

[0077] Table 2: Effect of different numbers of protrusions 131 on the natural frequency noise of the stator core 100

[0078]

[0079] It should be noted that since the stator core 100 is in the form of a cylinder, the second-order elliptical mode can better reflect the natural frequency of the stator core 100. The tested motor is an 8-pole 12-slot motor, so 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 181 Hz, and when four protrusions 131 are provided, the natural frequency is increased to 540 Hz, with an increase of about 198.34%, and the noise is also reduced from 43 dB to 41 dB. When six protrusions 131 and twelve 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 relative to the natural frequency when four protrusions 131 are provided is 14.8%, and the increase of the natural frequency when twelve protrusions 131 are provided relative to the natural frequency when six protrusions 131 are provided is 19.4%, and 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 size and other problems, 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.

[0080] Since the height of the protrusion 131 affects the size of the force required for bending the preformed stamping 200, in order to reasonably design the height of the protrusion 131, refer to Figure 6As shown in the embodiment of the utility model, along the length direction of the yoke piece 220, the yielding slot 210 has two oppositely arranged inclined surfaces 211, the included angle between the two inclined surfaces 211 is alpha, the maximum thickness of the yoke piece 220 is L, the maximum protruding height of the protrusion 131 is D, and the following is satisfied: D = L x tan (alpha / 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 piece 220 is in a multi-arc shape, that is, after being bent, the yoke part 120 is configured as Figure 7 An arc shape, the maximum thickness of the yoke piece 220 refers to the maximum thickness in the radial direction of the stator core 100. When the yoke piece 220 is in a straight strip shape, that is, after being bent, the yoke part 120 is configured as a polygonal structure, the maximum thickness of the yoke piece 220 refers to the maximum thickness in the direction perpendicular to the outer side wall of the yoke piece 220.

[0081] It can be understood that the maximum height of the protrusion 131 can be calculated by adding S3 to the value calculated according to the included angle of the yielding slot 210 and the maximum thickness of the yoke piece 220. When D is less than L x tan (alpha / 2) + S3, that is, the protruding height of the protrusion 131 is relatively low, 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 x tan (alpha / 2) + S3, the force required for bending the prefabricated punching sheet 200 increases, the bending difficulty increases, which is not conducive to the production of the stator punching sheet 150. Therefore, by designing D = L x tan (alpha / 2) + S3, the strength and rigidity of the stator core 100 can be increased, and at the same time, the force required for bending the prefabricated punching sheet 200 is ensured to be of an appropriate size, which is conducive to the production and manufacturing of the stator punching sheet 150.

[0082] In the embodiment of the utility model, 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. In the case where D is constant, when W1 / D is less than 1.8, the maximum width of the protrusion 131 is relatively small, 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 for bending the prefabricated punching sheet 200 increases, 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, the strength and rigidity of the stator core 100 can be increased, and at the same time, the force required for bending the prefabricated punching sheet 200 is ensured to be of an appropriate size, which is conducive to the production and manufacturing of the stator punching sheet 150.

[0083] Referring to Figure 8As shown in the embodiment of the utility model, 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 height of the protrusion 131 will affect the force required for bending the prefabricated punching sheet 200. When D is less than 3mm, the protrusion 131 is low, 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 for bending 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 D in the range of 3mm to 6mm, the strength and rigidity of the stator core 100 can be increased, and the force required for bending the prefabricated punching sheet 200 can be ensured to be appropriate, which is conducive to the production and manufacture of the stator punching sheet 150.

[0084] Referring to Figure 8 As shown in the embodiment of the utility model, along the circumferential direction of the stator core 100, the maximum width of the protrusion 131 is W1, 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 size of the force required for bending 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 for bending 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 W1 in the range of 6mm to 12mm, the strength and rigidity of the stator core 100 can be increased, and the force required for bending the prefabricated punching sheet 200 can be ensured to be appropriate, which is conducive to the production and manufacture of the stator punching sheet 150.

[0085] Referring to Figure 7 And Figure 8 As shown in the embodiment of the utility model, the protrusion 131 is symmetrically arranged along the extension line of the joint 121. For example, the protrusion 131 is in the shape of a semicircular column and is symmetrically arranged relative to the extension line of the joint 121, or the protrusion 131 is in the shape of a square column, a triangular column, etc., and the appropriate shape is selected according to the actual situation. By arranging the protrusion 131 symmetrically along the extension line of the joint 121, the strength and rigidity of the stator core 100 at the joint 121 can be improved, and the structure design of the protrusion 131 is reasonable and simple and convenient to produce.

[0086] Referring to Figure 10 And Figure 11As shown, in the embodiment of the utility model, first reinforcing portion 130 can also be weld 132. It can be understood that the stator lamination 150 is clamped and fixed after being bent, and then further fixed by welding. Weld 132 is usually formed during welding, and weld 132 is located on the outside of yoke portion 120 and is arranged along the axial direction of stator core 100 to improve the stability and reliability of the connection between stator laminations 150. In this embodiment, one stator core 100 has multiple welds 132, and the multiple welds 132 are arranged at intervals along the circumferential direction of stator core 100, and weld 132 is located on the outside of the yoke portion 120 corresponding to joint 121, and the extension line of joint 121 also passes through weld 132. It can be understood that the overall stiffness and strength of stator core 100 can be effectively improved by arranging multiple welds 132, and the noise during motor operation can be reduced. It should be noted that when first reinforcing portion 130 is weld 132, stator core 100 can also be a segmented stator. It should also be noted that the scheme of arranging weld 132 can be applied to the same stator core 100 as the scheme of arranging protrusion 131, for example, weld 132 and protrusion 131 are arranged alternately on the peripheral wall of yoke portion 120.

[0087] Referring to Figure 10 As shown, in the embodiment of the utility model, multiple welds 132 are arranged at intervals along the circumferential direction of stator core 100. For example, four welds 132 are arranged at intervals on the peripheral wall of stator core 100. Of course, weld 132 can also be three, six, etc. It should be noted that it is not necessary to arrange one weld 132 for each joint 121, and some joints 121 can be arranged with weld 132, of course, it is also feasible to arrange one weld 132 for each joint 121, and the specific scheme can be selected according to the actual situation. It can be understood that the more the number of welds 132, the easier it is for adjacent stator laminations 150 to communicate with each other, resulting in more magnetic flux leakage, and the production cost increases. At the same time, a specific number of welds 132 can cause the natural frequency of stator core 100 and the frequency during motor operation to be close, which can worsen the noise. Therefore, reasonable design of the number of welds 132 can ensure that the production cost is controlled within a reasonable range, while improving the strength and stiffness of stator core 100 and reducing noise.

[0088] Referring to Figure 10 and Figure 11As shown, in the embodiment of the utility model, 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 current for welding is 70A, which is easy to cause the width of the weld 132 to be too large, usually greater than 2mm, resulting in an increase in the magnetic leakage of the stator core 100. Therefore, by changing the welding current to 50A, the width of the weld 132 can be reduced to stabilize at a width of 1mm to 2mm, reducing the magnetic leakage, and the welding effect is better.

[0089] The motor of one embodiment of the utility model includes the stator assembly 1000 of the above embodiment. The motor of the embodiment of the utility model adopts the stator assembly 1000 of the above embodiment, and the plastic wrapping part 300 is arranged on the stator core 100, the end face of the opening part 301 is provided with the stop opening boss 310, and the stop opening boss 310 and the end cover 400 are in abutting cooperation. The height of the stator core 100 is h0, the distance between the first end face 302 of the opening part 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 different height of the stator core 100, the distance h between the first end face 302 and the second end face 101 is calculated according to the corresponding formula, and h reflects the height of the plastic wrapping part 300 protruding from the stator core 100. The greater h is, the higher the height of the plastic wrapping part 300 is, the more the material of the plastic wrapping part 300 is used, and the higher the cost is, but the overall strength and rigidity of the stator assembly 1000 are improved, and the noise during the operation of the motor can be reduced. The smaller h is, the less the material of the plastic wrapping part 300 is used, 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. According to the calculation result of the above formula, the size of h can be designed, the relationship between the material of the plastic wrapping part 300 and the noise of the motor can be balanced, the noise of the motor can meet the requirements, and the material of the plastic wrapping part 300 can be in a suitable range, so that the production cost is reduced.

[0090] Referring to Figure 12 And Figure 13As shown, in the embodiment of the utility model, motor still include end cover 400, end cover 400 includes body 410 and second reinforcing portion 420, body 410 includes bearing portion 411, abutment portion 413, positioning flange 416 and connecting portion 430, the inside recess of bearing portion 411 forms bearing chamber 412, bearing chamber 412 is used to install bearing, and the one end of the shaft of motor is matched with bearing.Abutment portion 413 is connected to the edge of bearing portion 411 and is arranged around bearing chamber 412, and abutment portion 413 is used to abut with the inside wall of stop boss 310, thereby avoiding that dust, water and the like enter the inside of motor through the gap between abutment portion 413 and stop boss 310, to improve the safety and stability when motor operates.Positioning flange 416 is connected to the edge of abutment portion 413 and is arranged around abutment portion 413, and positioning flange 416 is used to position with the end face of stop boss 310, thereby determining the axial position between end cover 400 and motor.Connecting portion 430 is connected to positioning flange 416, and connecting portion 430 is used to be fixedly connected with plastic-coated portion 300, thereby fixing the relative position between end cover 400 and plastic-coated portion 300.

[0091] Second reinforcing portion 420 is arranged at least one of bearing portion 411, abutment portion 413 and positioning flange 416.For example, second reinforcing portion 420 is only arranged at bearing portion 411, or second reinforcing portion 420 is only arranged at abutment portion 413, or second reinforcing portion 420 is only arranged at positioning flange 416, or second reinforcing portion 420 is arranged at bearing portion 411, abutment portion 413 and positioning flange 416 simultaneously.It can be understood that second reinforcing portion 420 is arranged at least one of bearing portion 411, abutment portion 413 and positioning flange 416, which can improve the overall strength and rigidity of end cover 400, and can reduce the noise during motor operation.

[0092] Referring to Figure 13 As shown, in the embodiment of the utility model, second reinforcing portion 420 includes reinforcing rib 421, and reinforcing rib 421 is arranged at the outer end face of bearing portion 411.The outer end face of bearing portion 411 is the end face of the one end of bearing portion 411 away from bearing chamber 412.It can be understood that, since bearing chamber 412 needs to be formed in bearing portion 411 to install bearing, arranging reinforcing rib 421 at the outer end face of bearing portion 411 can avoid reinforcing rib 421 occupying the space of bearing chamber 412, so that the overall structure of end cover 400 is more compact, and the design is more reasonable.Meanwhile, arranging reinforcing rib 421 at the outer end face of bearing portion 411 also facilitates the stamping forming of reinforcing rib 421, and improves the production efficiency.It should be noted that, as an alternative embodiment, reinforcing rib 421 can also be arranged at the inner end face, the inner side face or the outer side face of bearing portion 411, which can also increase the overall rigidity and strength of end cover 400 and reduce the noise during motor operation.

[0093] Referring toFigure 13 and Figure 14 As shown in FIGS. 11 and 12, in the embodiment of the utility model, the outer end surface of the bearing part 411 is outwardly convex 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 loosening and falling off of the reinforcing rib 421 and the bearing part 411. It can be understood that arranging the reinforcing rib 421 on the outer end surface of the bearing part 411 can avoid 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. The middle part of the outer end surface of the bearing part 411 is provided with a through hole, the through hole is coaxially arranged and communicated with the bearing chamber 412, and the reinforcing rib 421 is arranged around the edge of the through hole, which is beneficial to the stamping forming of the reinforcing rib 421 and has high production efficiency.

[0094] Referring to Figure 13 As shown in FIGS. 11 and 12, in the embodiment of the utility model, the second reinforcing part 420 includes a convex rib 422, which is arranged on the abutting part 413, and the convex rib 422 is provided with a plurality of convex ribs 422 and is arranged around the bearing chamber 412. For example, the convex rib 422 is arranged on the outer wall of the abutting part 413 to avoid occupying the space inside the motor. As an alternative embodiment, the convex rib 422 can also be arranged on the inner wall of the abutting part 413, and the appropriate arrangement position is selected according to the actual situation. It should be noted that the inner wall of the abutting part 413 refers to the side facing the inside of the motor, and the outer wall of the abutting part 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 uniformly and spacedly arranged along the circumference of the bearing chamber 412. Of course, the convex rib 422 can also be other quantities, for example, one, two, three, four, etc., and the appropriate quantity is selected according to the actual situation. By arranging the convex rib 422 on the abutting part 413, the overall rigidity and strength of the abutting part 413 can be enhanced, and arranging a plurality of convex ribs 422 can further improve the strength of the abutting part 413, effectively avoiding the deformation and bending of the abutting part 413. At the same time, it can also reduce the resonance with the motor to reduce the noise during the operation of the motor.

[0095] Referring to Figure 13 and Figure 14 As shown in FIGS. 11 and 12, in the embodiment of the utility model, the inner wall of the abutting part 413 is concave, and the outer wall of the abutting part 413 corresponding position is outwardly convex to form the convex rib 422. Therefore, the convex rib 422 can be formed on the abutting part 413 through a stamping process, which can improve the production efficiency. Since the stamping process is adopted, the design of the plurality of convex ribs 422 is beneficial to the forming of each convex rib 422 and improves the rationality of the structure design of the end cover 400.

[0096] With reference to Figure 13 As shown in FIG. 4, in an embodiment of the utility model, the second reinforcing part 420 comprises a reinforcing flange 423, the reinforcing flange 423 is arranged at the edge of the positioning flange 416. For example, the reinforcing flange 423 is arranged around the positioning flange 416, and the reinforcing flange 423 and the positioning flange 416 are integrally formed, which can improve the stability and reliability of the connection between the reinforcing flange 423 and the positioning flange 416. The overall strength and rigidity of the positioning flange 416 can be improved after the reinforcing flange 423 is arranged, which effectively reduces the resonance of the end cover 400 and the motor and reduces the noise during the operation of the motor.

[0097] With reference to Figure 13 And Figure 14 As shown in FIG. 4, in an embodiment of the utility model, the edge of the positioning flange 416 is outwardly bent to form the reinforcing flange 423, and the outward bending refers to the direction away from the motor, that is, the backward bending. For example, the edge of the positioning flange 416 can be outwardly bent through a press bending process during processing to form the reinforcing flange 423. By using 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 the operation of the motor. It should be noted that in another embodiment, the edge of the positioning flange 416 is inwardly bent to form the reinforcing flange 423, which also improves the overall strength and rigidity of the positioning flange 416.

[0098] With reference to Figure 13 As shown in FIG. 4, in an embodiment of the utility model, the end cover 400 further comprises a connecting part 430 connected to the positioning flange 416, the connecting part 430 is provided with a plurality of connecting parts 430 and is arranged at intervals along the circumference of the positioning flange 416, the connecting part 430 is used for fixedly connecting the plastic-encapsulated stator, the reinforcing flange 423 is connected to the edge of the positioning flange 416 and is connected to the edge of the connecting part 430, and the reinforcing flange 423 is configured as a continuous annular structure. Therefore, the strength and rigidity of the connecting part 430 and the positioning flange 416 can be simultaneously improved.

[0099] With reference to Figure 13 And Figure 14 As shown in FIG. 4, in an embodiment of the utility model, the inner side of the body 410 is recessed, the outer side is protruded to form a bearing part 411, and the bearing part 411 and the abutting part 413 are integrally formed. It should be noted that the inner side of the body 410 is the side facing the plastic-encapsulated part 300, and the outer side is the side away from the plastic-encapsulated part 300. For example, through a stamping process, one side of the middle part of the body 410 is recessed, and the other side is protruded to form the bearing part 411. The processing efficiency can be improved, and the production cost can be reduced.

[0100] With reference to Figure 14As shown, in the embodiment of the utility model, the abutting part 413 includes a first annular sheet 414 and a second annular sheet 415, the first annular sheet 414 is connected to the edge of the bearing part 411 and extends along the radial direction of the bearing chamber 412, and the second annular sheet 415 is connected to the edge of the first annular sheet 414 and is arranged in the direction away from the inner side of the first annular sheet 414. The first annular sheet 414 is provided with a convex rib 422, and the second annular sheet 415 is used for abutting and matching with the side wall of the stop flange boss 310. By adopting the above scheme, the abutting part 413 has a simple structure and is convenient to manufacture.

[0101] Referring to Figure 13 As shown, in the embodiment of the utility model, the connecting part 430 is provided with a plurality of connecting parts and is arranged at intervals along the circumferential direction of the positioning flange 416. For example, the connecting part 430 is provided with three connecting parts, and the three connecting parts 430 are all connected to the positioning flange 416. Of course, the connecting part 430 can also be other quantities, for example, one, two, four, five, etc. Among them, referring to Figure 2 and Figure 3 As shown, the connecting part 430 is provided with a first connecting hole 331, and the plastic-coated part 300 includes a mounting seat, and the mounting seat is arranged along the axial direction of the motor. The number of mounting seats is the same as the number of connecting parts 430, and the rear end of the mounting seat is provided with a second connecting hole 341. When the end cover 400 is installed, the first connecting hole 331 and the second connecting hole 341 are aligned, and then the screw or bolt is arranged in the first connecting hole 331 and the second connecting hole 341, so as to fix the relative position of the end cover 400 and the plastic-coated part 300.

[0102] Referring to Figure 12 and Figure 13 As shown, in the embodiment of the utility model, 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 arranged in one of the connecting parts 430, and a positioning column 311 is arranged on the end face of the stop flange 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, thereby improving the assembly efficiency of the end cover 400.

[0103] Since the motor adopts all the technical solutions of the stator assembly 1000 in the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0104] The household appliance of the embodiment of the utility model, including above embodiment's motor, the household appliance can be washing machine, air conditioner, dehumidifier etc. The household appliance of the embodiment of the utility model adopts the motor of the above embodiment, and the stator assembly 1000 of the motor is plastic-coated in the stator core 100 by setting the plastic-coated part 300, the plastic-coated part 300 is provided with the stop boss 310 on the end face of the opening part 301, and the stop boss 310 and the end cover 400 are abutted and matched. The height of the stator core 100 is h0, the distance between the first end face 302 of the opening part 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 different 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, and h reflects the height of the plastic-coated part 300 protruding from the stator core 100. The greater h is, the higher the plastic-coated part 300 is, the more the material of the plastic-coated part 300 is used, and the higher the cost is, but the overall strength and rigidity of the stator assembly 1000 are improved, and the noise during the operation of the motor can be reduced. The smaller h is, the less the material of the plastic-coated part 300 is used, 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. According to the result of the calculation of the above formula, the size of h is designed, the relationship between the material of the plastic-coated part 300 and the noise of the motor can be balanced, so that the noise of the motor meets the requirements, and the material of the plastic-coated part 300 is also in a suitable range, so as to reduce the production cost.

[0105] 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 repeated here.

[0106] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above embodiments, and various changes can be made within the scope of the knowledge possessed by those skilled in the art without departing from the purpose of the utility model.

Claims

1. A stator assembly for use in a motor with end caps, characterized in that, The stator assembly includes: Stator core; The plastic-coated part is coated on the stator core. One end of the plastic-coated part has an opening. The end face of the opening is provided with a stop boss arranged around the central axis of the stator core. The stop boss is used to abut and cooperate with the end cover. The opening has a first end face located outside the stop boss, and the end face of the stator core facing the opening is a second end face. Along the axial direction of the stator assembly, the height of the stator core is h0, and the shortest distance between the first and second end faces is h, satisfying the following: When h0≥20mm, h=h0×0.85+S1, 3mm≤S1≤5mm; When h0 < 20 mm, h = h0 + S2, 3 mm ≤ S2 ≤ 5 mm.

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

3. The stator assembly according to claim 1, characterized in that: The stator core includes: Multiple punch segments are arranged circumferentially along the stator core. Each punch segment includes a magnetic guide segment and stator teeth. The stator teeth are connected to the inner side of the magnetic guide segment. The magnetic guide segments of adjacent punch segments are connected sequentially. A joint extending radially along the stator core is formed between two adjacent magnetic guide segments. The magnetic guide segments of multiple punch segments enclose each other to form a yoke. Multiple first reinforcing portions are spaced apart on the outer side of the yoke along the circumferential direction of the stator core, and the multiple first reinforcing portions extend along the axial direction of the stator core, and the multiple first reinforcing portions are respectively located on the extension line of the corresponding joint.

4. The stator assembly according to claim 3, characterized in that: The stator core includes a plurality of stator laminations stacked along the axial direction. The outer wall of each stator lamination is provided with a protrusion. The protrusions of the plurality of stator laminations are stacked along the axial direction of the stator core to form the first reinforcing part.

5. The stator assembly according to claim 3, characterized in that: The stator core includes a plurality of stator laminations stacked axially. The stator laminations are configured to be made of elongated prefabricated laminations, each prefabricated lamination including a yoke lamination and a plurality of stator laminations. The plurality of stator laminations are connected to the same side of the yoke lamination and are spaced apart along the length direction of the yoke lamination. The side where the yoke lamination and the stator laminations are connected is provided with a plurality of clearance grooves. The clearance grooves are located between adjacent stator laminations. Along the length direction of the yoke lamination, the clearance grooves have two oppositely arranged inclined surfaces with an included angle α between the two inclined surfaces. The maximum thickness of the yoke lamination is L. The first reinforcing part 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 a continuous annular surface, which is used to abut and cooperate with the abutment part of the end cap.

7. The stator assembly according to claim 1, characterized in that: The sidewall of the plastic-coated part is provided with a plurality of first mounting seats, which are spaced apart along the circumference of the stator assembly. The 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 base extends along the axial direction of the stator assembly, and the first connecting hole passes through both ends of the first mounting base along the axial direction of the stator assembly. The first connecting hole is used to connect with the end cover and the support leg of the motor.

9. An electric motor, characterized in that: It includes an end cap and a stator assembly according to any one of claims 1 to 8, wherein the end cap is mounted on the opening.

10. The motor according to claim 9, characterized in that, The motor further includes an end cover, the end cover comprising: The bearing section forms the bearing housing; An abutting part is connected to the bearing part and arranged around the bearing chamber, and the abutting part abuts against the inner wall of the stop boss; A positioning flange is connected to and surrounds the abutment portion, and the end face of the positioning flange and the stop boss are positioned and engaged. The second reinforcing part is disposed at at least one of the bearing part, the abutting part, and the positioning flange.

11. The motor according to claim 10, characterized in that, The second reinforcing part includes reinforcing ribs, raised ribs, and reinforcing flanges. The reinforcing ribs are disposed on the end face of the bearing part, the raised ribs are disposed on the abutting part, and multiple raised ribs are provided and spaced around the bearing chamber. The reinforcing flanges are connected to the edge of the positioning flanges.

12. A household appliance, characterized in that: The motor included in any one of claims 9 to 11.

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