Motor and household appliance

Abstract

The utility model discloses a motor and a household electrical appliance, and relates to the technical field of motors. The motor comprises a shell, a bearing assembly, a rotating shaft, a stator assembly and a rotor assembly, the rotating shaft is installed on the bearing assembly, one end of the rotating shaft penetrates out of an installation cavity of the shell, the stator assembly is located in the installation cavity and fixedly connected with the shell, and a first rotor and a second rotor of the rotor assembly are located at the two ends of the stator assembly respectively and fixedly connected with the rotating shaft. The plurality of coils of the stator assembly are arranged on the substrate, so that a stator core does not need to be arranged, and iron loss basically does not exist. By adopting the scheme that the substrate is connected with the coil, the axial size of the stator assembly can be greatly reduced. The first rotor and the second rotor are located on the two sides of the stator assembly in the axial direction respectively, a magnetic field loop can be built, and the radial size of the motor is small. Therefore, the size of the motor can be reduced, and miniaturization design of the motor is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a motor and a household appliance. Background Art

[0002] The blower of an air conditioner is usually driven by a motor. For example, in an inner rotor motor, the stator of the motor is sleeved outside the rotor, so the motor has a relatively large radial dimension; and the axial length of the winding of the stator affects the performance of the motor, so the motor also requires a certain length in the axial direction, resulting in a relatively large axial dimension of the motor, making it difficult to carry out miniaturized design. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a motor, which can reduce the volume of the motor and is beneficial to the miniaturized design of the motor.

[0004] The utility model also provides a household appliance having the above motor.

[0005] The motor according to the first aspect embodiment of the utility model includes: a housing, which forms an installation cavity inside;

[0006] a bearing assembly, fixedly connected to the housing;

[0007] a rotating shaft, installed on the bearing assembly and capable of rotating relative to the housing, and one end of the rotating shaft extends out of the installation cavity;

[0008] a stator assembly, located inside the installation cavity and fixedly connected to the housing, the stator assembly includes a substrate and a plurality of coils, the substrate is provided with a central hole for the rotating shaft to pass through, and the plurality of coils are arranged on the substrate and surround the rotating shaft;

[0009] a rotor assembly, including a first rotor and a second rotor, the first rotor and the second rotor are respectively located at two ends of the stator assembly along the axial direction of the rotating shaft, the first rotor and the second rotor are respectively arranged at intervals with the stator assembly, and the first rotor and the second rotor are respectively fixedly connected to the rotating shaft.

[0010] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0011] By setting a rotating shaft installed on the bearing assembly and one end passing through the mounting cavity of the housing, the stator assembly is located in the mounting cavity and fixedly connected to the housing, and the first rotor and the second rotor of the rotor assembly are respectively located at both ends of the stator assembly and fixedly connected to the rotating shaft. The magnetic field direction of the first rotor and the second rotor is along the axial direction of the rotating shaft. The magnetic field of the first rotor enters the second rotor after passing through the stator assembly, and then returns to the first rotor after passing through the stator assembly from the second rotor, so that the first rotor and the second rotor drive the rotating shaft to rotate. Among them, the multiple coils of the stator assembly are arranged on the substrate, so there is no need to set the stator core, and there is basically no iron loss. The axial size of the stator assembly can be greatly reduced by adopting the scheme of connecting the substrate and the coil. By setting the first rotor and the second rotor to be located on both sides of the stator assembly along the axial direction, it is conducive to constructing a magnetic field loop, and the radial size of the motor is small. Therefore, the volume of the motor can be reduced, which is conducive to the miniaturization design of the motor.

[0012] According to some embodiments of the utility model, the bearing assembly includes a first bearing and a second bearing, the housing includes an outer shell, a first end cover and a second end cover, the first end cover and the second end cover are respectively connected to the two ends of the outer shell along the axial direction, the first end cover is provided with a first mounting groove, the first mounting groove is fixedly provided with the first bearing sleeved on the rotating shaft, the second end cover is provided with a second mounting groove, the second mounting groove is fixedly provided with the second bearing sleeved on the rotating shaft.

[0013] According to some embodiments of the utility model, the motor further comprises an elastic member, which is arranged in the first mounting groove and located on the side of the first bearing facing away from the second bearing, and the elastic member is used to make the inner ring of the first bearing abut against the rotor assembly.

[0014] According to some embodiments of the present utility model, the motor further comprises a shaft sleeve, wherein the shaft sleeve is fixedly connected to the rotating shaft, and along the axial direction of the rotating shaft, two ends of the shaft sleeve are respectively fixedly connected to the first rotor and the second rotor.

[0015] According to some embodiments of the utility model, the inner wall of the shell is provided with a fixing portion, and the motor further comprises an insulating sheet, wherein the insulating sheet is located between the fixing portion and the stator assembly, and the stator assembly and the fixing portion are fixedly connected.

[0016] According to some embodiments of the present invention, the first rotor includes a first back iron and a plurality of first permanent magnets, wherein the plurality of first permanent magnets are connected to a side of the first back iron facing the stator assembly and are spaced around the rotating shaft; and / or,

[0017] The second rotor includes a second back iron and a plurality of second permanent magnets. The plurality of second permanent magnets are connected to a side of the second back iron facing the stator assembly and are arranged at intervals around the rotating shaft.

[0018] According to some embodiments of the present invention, the first back iron includes a first connecting portion and a first annular portion. The first annular portion is connected around the edge of the first connecting portion. The first annular portion is connected with the first permanent magnet. The first connecting portion is provided with a first positioning mark. The polarity of the first permanent magnet closest to the first positioning mark is the first polarity.

[0019] The second back iron includes a second connecting portion and a second annular portion. The second annular portion is connected around the edge of the second connecting portion. The second annular portion is connected with the second permanent magnet. The second connecting portion is provided with a second positioning mark. The polarity of the second permanent magnet closest to the second positioning mark is the second polarity, and the second polarity is opposite to the first polarity.

[0020] According to some embodiments of the present invention, the motor further includes a shaft sleeve. The shaft sleeve is fixedly connected to the rotating shaft. The first connecting portion is provided with a plurality of mounting holes. The plurality of mounting holes are arranged at intervals along the circumferential direction of the rotating shaft. The first connecting portion is fixedly connected to one end of the shaft sleeve by a fastener passing through the mounting holes.

[0021] According to some embodiments of the present invention, the first connecting portion is provided with a plurality of positioning holes. The plurality of positioning holes and the plurality of mounting holes are alternately arranged along the circumferential direction of the rotating shaft. The shaft sleeve is provided with a plurality of positioning posts. The plurality of positioning posts and the plurality of positioning holes are in one-to-one correspondence and cooperation.

[0022] According to some embodiments of the present invention, the outer wall of the housing is provided with support feet. The motor further includes a damping sleeve wound around the support feet; and / or,

[0023] The outer wall of the housing is provided with mounting feet. The mounting feet are provided with slots. The motor further includes a damping member. The damping member includes a connecting column and two damping pieces. The two damping pieces are connected to both ends of the connecting column. The connecting column is clamped in the slot. The two damping pieces are respectively located on both sides of the mounting feet along the circumferential direction of the housing.

[0024] According to some embodiments of the present utility model, the stator assembly further includes a multi-layer winding. The multi-layer windings are sequentially arranged along the axial direction of the stator assembly and are connected to the substrate. An insulating layer is provided between adjacent windings. The winding includes a plurality of coils, and the number of coils in each layer of the winding is the same. The plurality of coils in each layer of the winding are spaced apart along the circumferential direction of the stator assembly. The multi-layer windings include a plurality of coil stacking layers arranged along the circumferential direction of the stator assembly, and all the coils of each coil stacking layer are sequentially connected.

[0025] According to some embodiments of the present utility model, the number of coils in each layer of the winding is twelve, and all the coil stacking layers are connected by a star connection method.

[0026] The household appliance according to the embodiment of the second aspect of the present utility model includes the motor described in the above embodiment.

[0027] The household appliance according to the embodiment of the present utility model has at least the following beneficial effects:

[0028] By adopting the motor of the first aspect embodiment, the motor is installed on the bearing assembly through the rotating shaft and one end extends out of the installation cavity of the housing. The stator assembly is located in the installation cavity and is fixedly connected to the housing. The first rotor and the second rotor of the rotor assembly are respectively located at both ends of the stator assembly and are fixedly connected to the rotating shaft. The magnetic field directions of the first rotor and the second rotor are along the axial direction of the rotating shaft. The magnetic field of the first rotor enters the second rotor after passing through the stator assembly, and then returns to the first rotor after passing through the stator assembly from the second rotor, thereby causing the first rotor and the second rotor to drive the rotating shaft to rotate. Among them, the multiple coils of the stator assembly are arranged on the substrate, so there is no need to set a stator core, and there is basically no iron loss. By adopting the scheme of connecting the substrate and the coil, the axial dimension of the stator assembly can be greatly reduced. By setting the first rotor and the second rotor respectively on both sides of the stator assembly along the axial direction, it is beneficial to construct a magnetic field circuit, and the radial dimension of the motor is small. Therefore, the volume of the motor can be reduced, which is beneficial to the miniaturization design of the motor.

[0029] The additional aspects and advantages of the present utility model will be partially given in the following description, partially will become obvious from the following description, or will be understood through the practice of the present utility model. Description of the Drawings

[0030] The following will further illustrate the present utility model in conjunction with the drawings and embodiments, where:

[0031] Figure 1 is a schematic structural diagram of a motor according to an embodiment of the present utility model;

[0032] Figure 2 is a cross-sectional view of a motor according to an embodiment of the present utility model;

[0033] Figure 3 is an exploded view of the motor according to an embodiment of the present utility model;

[0034] Figure 4 is a simplified schematic diagram of the magnetic circuit path of the stator assembly and the rotor assembly according to an embodiment of the present utility model;

[0035] Figure 5 is a partial structural schematic diagram of the motor according to an embodiment of the present utility model;

[0036] Figure 6 is a structural schematic diagram of the first rotor according to an embodiment of the present utility model;

[0037] Figure 7 is a structural schematic diagram of the second rotor according to an embodiment of the present utility model;

[0038] Figure 8 is an exploded view of the stator assembly according to an embodiment of the present utility model;

[0039] Figure 9 is an exploded view of the coil stacking layer according to an embodiment of the present utility model;

[0040] Figure 10 is a simplified schematic diagram of the winding wire unwinding according to an embodiment of the present utility model;

[0041] Figure 11 is a structural schematic diagram of the coil according to an embodiment of the present utility model;

[0042] Figure 12 is a structural schematic diagram of the first layer winding according to an embodiment of the present utility model;

[0043] Figure 13 is a structural schematic diagram of the second layer winding according to an embodiment of the present utility model;

[0044] Figure 14 is a structural schematic diagram of the third layer winding according to an embodiment of the present utility model;

[0045] Figure 15 is a structural schematic diagram of the fourth layer winding according to an embodiment of the present utility model;

[0046] Figure 16 is a structural schematic diagram of the fifth layer winding according to an embodiment of the present utility model;

[0047] Figure 17 is a structural schematic diagram of the sixth layer winding according to an embodiment of the present utility model;

[0048] Figure 18 is a structural schematic diagram of the seventh layer winding according to an embodiment of the present utility model;

[0049] Figure 19 It is a schematic structural diagram of the eighth-layer winding of an embodiment of the present utility model.

[0050] Reference numerals:

[0051] Motor 1000;

[0052] Housing 100; Installation cavity 110; Outer shell 120; Fixing part 121; Insulating sheet 122; Support feet 123; Vibration damping sleeve 124; Installation feet 125; Card slot 1251; Vibration damping member 126; Connecting column 1261; Vibration damping sheet 1262; First end cover 130; First installation groove 131; First bearing 132; Elastic member 133; Second end cover 140; Second installation groove 141; Second bearing 142;

[0053] Rotating shaft 200; Bush 210;

[0054] Stator assembly 300; Substrate 310; Central hole 311; Winding 320; First-layer winding 321; Second-layer winding 322; Third-layer winding 323; Fourth-layer winding 324; Fifth-layer winding 325; Sixth-layer winding 326; Seventh-layer winding 327; Eighth-layer winding 328; Coil 329; Conducting wire 330; Inner end 331; Outer end 332; Coil stacking layer 340;

[0055] Rotor assembly 400; First rotor 410; First back iron 411; First connecting part 4111; First annular part 4112; First positioning mark 4113; First permanent magnet 412; Installation hole 413; Positioning hole 414; Second rotor 420; Second back iron 421; Second connecting part 4211; Second annular part 4212; Second positioning mark 4213; Second permanent magnet 422. Detailed implementation manners

[0056] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation to the present utility model.

[0057] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0058] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the corresponding number, and understandings such as "above", "below", "within", etc. include the corresponding number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0059] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0060] Refer to Figure 1 、 Figure 2 and Figure 3 As shown in Figure 5 , a motor 1000 according to an embodiment of the present utility model can be used in household appliances such as air conditioners, refrigerators, fans, humidifiers, etc. The motor 1000 according to the embodiment of the present utility model includes a housing 100, a bearing assembly, a rotating shaft 200, a stator assembly 300, and a rotor assembly 400. An installation cavity 110 is formed inside the housing 100. The bearing assembly is fixedly connected to the housing 100. The rotating shaft 200 is installed in the bearing assembly and one end extends out of the installation cavity 110. The rotating shaft 200 can rotate relative to the housing 100. Refer to

[0061] Refer to Figure 4As shown, the magnetic field directions of the first rotor 410 and the second rotor 420 are along the axial direction of the rotating shaft 200. The magnetic field of the first rotor 410 enters the second rotor 420 after passing through the stator assembly 300, and then returns to the first rotor 410 after passing through the stator assembly 300 from the second rotor 420, thereby causing the first rotor 410 and the second rotor 420 to drive the rotating shaft 200 to rotate. Among them, multiple coils 329 of the stator assembly 300 are arranged on the substrate 310, so there is no need to arrange a stator iron core, and there is basically no iron loss. By adopting the scheme of connecting the substrate 310 and the coils 329, the axial dimension of the stator assembly 300 can be greatly reduced. By arranging the first rotor 410 and the second rotor 420 on both sides of the stator assembly 300 along the axial direction respectively, it is beneficial to construct a magnetic field circuit, and the radial dimension of the motor 1000 is small. Therefore, the volume of the motor 1000 can be reduced, which is beneficial to the miniaturized design of the motor 1000.

[0062] Referring to Figure 2 and Figure 3 As shown, in the embodiment of the present invention, the bearing assembly includes a first bearing 132 and a second bearing 142, and the housing 100 includes a housing 120, a first end cover 130 and a second end cover 140. The housing 120 is annular, and the first end cover 130 and the second end cover 140 are respectively connected to both ends of the housing 120 along the axial direction. Therefore, an installation cavity 110 is formed between the inner wall of the housing 120, the inner wall of the first end cover 130 and the inner wall of the second end cover 140. A first installation groove 131 is provided on the side of the first end cover 130 facing the second end cover 140. For example, a sleeve is provided in the middle of the first end cover 130, and the first installation groove 131 is formed inside the sleeve. The first bearing 132 is provided in the first installation groove 131. The first bearing 132 is sleeved on the rotating shaft 200, and the inner ring of the first bearing 132 is fixedly connected to the rotating shaft 200, and the outer ring of the first bearing 132 is fixedly connected to the inner wall of the first installation groove 131. A second installation groove 141 is provided on the side of the second end cover 140 facing the first end cover 130. For example, a sleeve is provided in the middle of the second end cover 140, and the second installation groove 141 is formed inside the sleeve. The second bearing 142 is provided in the second installation groove 141. The second bearing 142 is sleeved on the rotating shaft 200, and the inner ring of the second bearing 142 is fixedly connected to the rotating shaft 200, and the outer ring of the second bearing 142 is fixedly connected to the inner wall of the second installation groove 141.

[0063] By adopting the above scheme, the first bearing 132 and the second bearing 142 play a role in supporting the rotating shaft 200, and at the same time can ensure the smoothness of the rotation of the rotating shaft 200. By respectively arranging the first bearing 132 and the second bearing 142 on the first end cover 130 and the second end cover 140, the space inside the housing 100 can be reasonably utilized, making the overall structure of the motor 1000 compact, which is beneficial to the miniaturized design of the motor 1000.

[0064] Continuing to refer toFigure 2 and Figure 3 As shown, in the embodiment of the utility model, the motor 1000 further includes an elastic member 133, which is arranged in the first installation groove 131 and located on the side of the first bearing 132 away from the second bearing 142, and the elastic member 133 is used to make the inner ring of the first bearing 132 abut against the rotor assembly 400. For example, the elastic member 133 can be a wave washer, a spring washer, a disc washer, a spring, a rubber member, a silicone member, etc., which can provide a certain pre-tightening force to the inner ring of the first bearing 132, so that the inner ring of the first bearing 132 can abut against the first rotor 410 to prevent the first bearing 132 from loosening. The second bearing 142 can be limited by abutting against the second rotor 420, so the elastic member 133 can be not arranged in the second installation groove 141, so as to reduce the installation steps, improve the production efficiency and reduce the production cost. Of course, as an alternative embodiment, it is also feasible to dispose an elastic member 133 in the second installation groove 141 to keep the second bearing 142 and the second rotor 420 in abutment with each other. A suitable solution can be selected according to actual conditions.

[0065] Reference Figure 2 As shown, in the embodiment of the utility model, the motor 1000 also includes a sleeve 210, which is sleeved on the rotating shaft 200 and fixedly connected to the rotating shaft 200. The fixed connection method can be interference fit, fastener connection, welding, glue bonding, etc. Along the axial direction of the rotating shaft 200, the two ends of the sleeve 210 are respectively fixedly connected to the first rotor 410 and the second rotor 420, so that the first rotor 410 and the second rotor 420 can drive the rotating shaft 200 to rotate synchronously through the sleeve 210 during the rotation process. At the same time, the sleeve 210 is also penetrated through the center hole 311 of the base plate 310, and the sleeve 210 and the base plate 310 are arranged at intervals to avoid friction and wear caused by the sleeve 210 contacting with the base plate 310 during the rotation process, so as to improve the rationality of the internal structure design of the motor 1000. The sleeve 210 is used to connect the rotor assembly 400 and the rotating shaft 200, so it plays a role in transmitting motion, so that the first rotor 410 and the second rotor 420 can smoothly drive the rotating shaft 200 to rotate to output torque.

[0066] Reference Figure 2 and Figure 3As shown, in an embodiment of the present utility model, a fixing portion 121 is provided on the inner wall of the housing 100, and the fixing portion 121 protrudes towards the direction of the rotating shaft 200. Among them, the fixing portion 121 can be annular and disposed around the inner wall of the outer shell 120, or the fixing portion 121 can also be a structure formed by a plurality of protrusions arranged at intervals along the inner wall of the outer shell 120. The motor 1000 further includes an insulating sheet 122, and the insulating sheet 122 is located between the fixing portion 121 and the stator assembly 300, and the stator assembly 300 is fixedly connected to the fixing portion 121. For example, the substrate 310 of the stator assembly 300 is connected to the fixing portion 121 through fasteners such as screws and bolts, which can improve the connection stability and reliability of the stator assembly 300. Setting the insulating sheet 122 between the stator assembly 300 and the fixing portion 121 can play a role in electrical isolation, preventing the stator assembly 300 from guiding current to the housing 100 and causing the housing 100 to be charged, so as to improve the safety of the motor 1000 during operation.

[0067] Referring to Figure 6 As shown, in an embodiment of the present utility model, the first rotor 410 includes a first back iron 411 and a plurality of first permanent magnets 412. The first permanent magnets 412 are disposed on one side of the first back iron 411 facing the stator assembly 300, and the plurality of first permanent magnets 412 are arranged at intervals along the circumferential direction of the rotating shaft 200. The polarities of the ends of adjacent first permanent magnets 412 facing away from the first back iron 411 are opposite. Referring to Figure 7 As shown, the second rotor 420 includes a second back iron 421 and a plurality of second permanent magnets 422. The second permanent magnets 422 are disposed on one side of the second back iron 421 facing the stator assembly 300, and the plurality of second permanent magnets 422 are arranged at intervals along the circumferential direction of the rotating shaft 200. The polarities of the ends of adjacent second permanent magnets 422 facing away from the second back iron 421 are opposite. The number of the second permanent magnets 422 is the same as that of the first permanent magnets 412, and the polarities of the second permanent magnets 422 axially opposite to the first permanent magnets 412 are opposite. Therefore, the magnetic field of the first permanent magnets 412 can enter the second permanent magnets 422 after passing through the stator assembly 300, and then return to the first permanent magnets 412 after passing through the stator assembly 300 from the second permanent magnets 422, which is beneficial to constructing a magnetic field loop and improving the working efficiency of the motor 1000.

[0068] Referring to Figure 5 、 Figure 6 and Figure 7As shown, in the embodiment of the present utility model, the number of windings 320 is set to twelve, and the number of the first permanent magnets 412 and the second permanent magnets 422 is ten each. That is, the motor 1000 adopts a 12-slot 10-pole scheme, and the winding factor reaches 0.933. Therefore, the electromagnetic field distribution inside the motor 1000 can be optimized, making the magnetic field more uniform and stable, and reducing the copper loss during the operation of the motor 1000. This helps to reduce electromagnetic interference and energy loss, improve the power factor of the motor 1000, and further improve the overall performance of the motor 1000.

[0069] Referring to Figure 6 As shown, in the embodiment of the present utility model, the first back iron 411 includes a first connecting portion 4111 and a first annular portion 4112. The first connecting portion 4111 protrudes towards the shaft sleeve 210. Therefore, a groove is formed on the side of the first connecting portion 4111 facing the first bearing 132, such that a part of the structure of the first bearing 132 is located in the groove. Therefore, the compactness of the motor 1000 is better, which is beneficial to the miniaturization design of the motor 1000. The first annular portion 4112 is circumferentially connected to the edge of the first connecting portion 4111. The first annular portion 4112 is connected with the first permanent magnet 412. The first connecting portion 4111 is provided with a first positioning mark 4113, and the polarity of the first permanent magnet 412 closest to the first positioning mark 4113 is the first polarity. The first positioning mark 4113 can be a bump, a hole, a text mark, etc., to prompt the assembly worker of the polarity of the first permanent magnet 412 here and reduce the situation of installation errors.

[0070] Referring to Figure 7 As shown, the second back iron 421 includes a second connecting portion 4211 and a second annular portion 4212. The second annular portion 4212 is circumferentially connected to the edge of the second connecting portion 4211. The second annular portion 4212 is connected with the second permanent magnet 422. The second connecting portion 4211 is provided with a second positioning mark 4213, and the polarity of the second permanent magnet 422 closest to the second positioning mark 4213 is the second polarity. The second positioning mark 4213 can be a bump, a hole, a text mark, etc., to prompt the assembly worker of the polarity of the second permanent magnet 422 here. Among them, the second polarity is opposite to the first polarity. Since the polarities of the first permanent magnet 412 and the second permanent magnet 422 opposite to each other axially should be opposite, the first positioning mark 4113 and the second positioning mark 4213 are used for prompting, such that the first positioning mark 4113 and the second positioning mark 4213 are opposite to each other axially during installation, so as to ensure that the polarities of the first permanent magnet 412 and the second permanent magnet 422 opposite to each other axially are opposite, thereby improving the assembly accuracy.

[0071] Referring to Figure 6As shown, in the embodiment of the present utility model, the first connecting portion 4111 is provided with a plurality of mounting holes 413. The plurality of mounting holes 413 are arranged at intervals along the circumferential direction of the rotating shaft 200. The first connecting portion 4111 is fixedly connected to one end of the shaft sleeve 210 by a fastener passing through the mounting holes 413. By providing the plurality of mounting holes 413, the stability and reliability of the connection of the first connecting portion 4111 can be improved. Among them, the fastener can be a screw, a bolt, a pin shaft, etc. Refer to Figure 7 As shown, the second connecting portion 4211 is also provided with a plurality of mounting holes 413. The arrangement position and effect are similar to those of the first connecting portion 4111, and will not be elaborated here.

[0072] Refer to Figure 6 As shown, in the embodiment of the present utility model, the first connecting portion 4111 is provided with a plurality of positioning holes 414. The plurality of positioning holes 414 and the plurality of mounting holes 413 are alternately arranged along the circumferential direction of the rotating shaft 200. The shaft sleeve 210 is provided with a plurality of positioning posts (not shown in the figure). The plurality of positioning posts and the plurality of positioning holes 414 are in one-to-one correspondence and cooperation. By arranging the positioning holes 414 and the mounting holes 413 alternately along the circumferential direction of the rotating shaft 200, it is convenient to determine the relative positions of the first rotor 410 and the second rotor 420 on the shaft sleeve 210, so that the first positioning mark 4113 and the second positioning mark 4213 are axially aligned, thereby ensuring that the polarities of the first permanent magnet 412 and the second permanent magnet 422 opposite to each other in the axial direction, and further improving the assembly accuracy.

[0073] Refer to Figure 1 and Figure 3 As shown, in the embodiment of the present utility model, the outer wall of the housing 100 is provided with mounting feet 125. The mounting feet 125 are provided with card slots 1251. The motor 1000 further includes a vibration damping member 126. The vibration damping member 126 includes a connecting column 1261 and two vibration damping sheets 1262. The two vibration damping sheets 1262 are connected to both ends of the connecting column 1261. The connecting column 1261 is clamped in the card slot 1251. The two vibration damping sheets 1262 are respectively located on both sides of the mounting feet 125 along the circumferential direction of the housing 100. The outer wall of the housing 100 is provided with support feet 123. The motor 1000 further includes a vibration damping sleeve 124. The vibration damping sleeve 124 is wound around the support feet 123. It can be understood that the mounting feet 125 are used to fixedly connect the motor 1000 to the mounting plate (not shown in the figure) of the household appliance to determine the position of the motor 1000, and the vibration damping member 126 is provided to reduce the situation where the vibration of the motor 1000 is transmitted to the mounting plate; at the same time, the support feet 123 are used to abut against the bottom plate (not shown in the figure) of the household appliance, and the vibration damping sleeve 124 is used to reduce the situation where the vibration of the motor 1000 is transmitted to the bottom plate, thereby reducing the noise generated by the motor 1000 and improving the user experience.

[0074] Refer to Figure 5 and Figure 8As shown, in the embodiment of the present utility model, the stator assembly 300 further includes a multi-layer winding 320. The multi-layer winding 320 is arranged axially along the stator assembly 300 in sequence and is connected to the substrate 310. An insulating layer is provided between adjacent windings 320. The winding 320 includes a plurality of coils 329, and the number of coils 329 in each layer of the winding 320 is the same. The plurality of coils 329 in each layer of the winding 320 are arranged at intervals along the circumferential direction of the stator assembly 300. Refer to Figure 9 As shown, the multi-layer winding 320 includes a plurality of coil stacking layers 340 arranged along the circumferential direction of the stator assembly 300. All the coils 329 of each coil stacking layer 340 are connected in sequence. Any set of stacked coils 329 of the multi-layer winding 320 in the axial direction is a coil stacking layer 340, and the coils 329 in the coil stacking layer 340 are connected in sequence along the axial direction.

[0075] For example, refer to Figure 8 and Figure 10 As shown, the winding 320 has eight layers, namely the first-layer winding 321, the second-layer winding 322, the third-layer winding 323, the fourth-layer winding 324, the fifth-layer winding 325, the sixth-layer winding 326, the seventh-layer winding 327, and the eighth-layer winding 328. Each layer of the winding 320 includes twelve coils 329. Along the circumferential direction of the stator assembly 300, the twelve coils 329 in the same layer of the winding 320 are in sequence: coil PA1, coil RA2, coil PC2, coil RC2, coil RB2, coil PB2, coil PA2, coil RA1, coil PC1, coil RC1, coil RB1, coil PB1. The coil PA1 of the first-layer winding 321, the coil PA1 of the second-layer winding 322, the coil PA1 of the third-layer winding 323, the coil PA1 of the fourth-layer winding 324, the coil PA1 of the fifth-layer winding 325, the coil PA1 of the sixth-layer winding 326, the coil PA1 of the seventh-layer winding 327, and the coil PA1 of the eighth-layer winding 328 are stacked axially and form a set of coil stacking layers 340. The same applies to other coils such as coil RA2 and coil PC2, which will not be elaborated here. It should be noted that the number of windings 320 can also be four layers, five layers, six layers, etc., and the number of coils 329 can also be eight, ten, fourteen, etc. The specific number is selected according to the actual situation. For the convenience of explanation, in the subsequent embodiments, it is taken as an example that there are twelve coils 329 in one layer of the winding 320 for illustration.

[0076] Adopting the above solution, by arranging the windings 320 to be stacked axially, the magnetic field intensity can be increased, thereby improving the power density of the motor 1000. And the coils 329 in the coil stacking layer 340 are connected in sequence along the axial direction, which enables the stator assembly 300 to be miniaturized while reducing the end losses of the winding 320. Therefore, the wiring of the winding 320 is more reasonable, which is beneficial to improving the output performance of the motor 1000.

[0077] Referring to Figure 12 As shown, in the embodiment of the present utility model, the number of coils 329 in each layer of winding 320 is twelve, and the coils 329 of the multi-layer windings 320 are connected by a star connection. The mechanical angle between adjacent coils 329 in the circumferential direction differs by 30°. When the number of pole pairs of the rotor assembly 400 is 5, the difference in electrical angle = 360° / (12×5)=150°. Figure 10 One of the hexagonal boxes in can be understood as a coil stack layer 340. It can be understood that by designing the number of coils 329 of the winding 320 to be twelve, the winding coefficient can be improved.

[0078] Adopting the above scheme, the coils 329 of the multi-layer windings 320 are connected by a star connection. When the impedance values of each coil 329 are equal, the currents on the three phase lines will remain equal, which helps to achieve the balance of the three-phase load and reduce the vibration and noise during the operation of the motor 1000. The star connection has a certain fault tolerance. When one of the windings 320 or the load fails, since the other windings 320 still remain in the normal working state, the entire motor 1000 system will not fail immediately, thereby improving the reliability and stability of the system.

[0079] Referring to Figure 11 As shown, in the embodiment of the present utility model, the coil 329 is configured as a structure formed by a strip-shaped wire 330 extending around the inner end portion 331 of the wire 330. The wire 330 is flat, so the wire 330 has better heat conduction performance and lower temperature rise, is more reliable and stable in a high-temperature environment, and has less mechanical noise and electromagnetic noise. It should be noted that the two ends of the wire 330 are respectively the inner end portion 331 and the outer end portion 332. The end located inside the coil 329 is the inner end portion 331, and the end located outside the coil 329 is the outer end portion 332. The wire 330 continuously extends outward around the inner end portion 331, similar to a spiral winding. The winding directions of adjacent coils 329 in the coil stack layer 340 are opposite, and the inner end portions 331 of adjacent coils 329 in the coil stack layer 340 are connected by a conductive member.

[0080] For example, referring to Figures 12 to 19 As shown, starting from the inner end portion 331, in Figure 12 the coil RC1 of the first-layer winding 321, the coil RC1 is wound around in the counterclockwise direction; Figure 13 in the coil RC1 of the second-layer winding 322 in, the coil RC1 is wound around in the clockwise direction. The same applies to the coils 329 of other layers and will not be elaborated here. It can be understood that Figures 12 to 19The arrow on the coil 329 indicates the direction of the current. By setting the winding directions of adjacent coils 329 in the coil stack layer 340 to be opposite, the current directions of adjacent coils 329 in the coil stack layer 340 are the same. For example, the current directions of the coils RC1 are all counterclockwise, thus preventing the magnetic fields generated by adjacent coils 329 from canceling each other out, effectively increasing the magnetic field intensity and improving the performance of the motor 1000.

[0081] Referring to Figure 11 As shown, in the embodiment of the present invention, the number of turns S of the wire 330 wound is such that 3 ≤ S ≤ 4. For example, the number of turns S is three or four. Along the radial direction of the stator assembly 300, the wire width H of the wire 330 is such that 0.8 mm ≤ H ≤ 1.6 mm. For example, the value of H can be 0.8 mm, 0.9 mm, 1 mm, 1.3 mm, or 1.6 mm. It can be understood that, with the number of coils 329 fixed, the number of turns is affected by the wire width. The larger the wire width, the smaller the resistance, but the number of turns will decrease, resulting in a decrease in the electromotive force generated when cutting the magnetic induction line. Therefore, the wire width and the number of turns affect each other, and it is necessary to balance the relationship between the resistance and the induced electromotive force. By setting the number of turns S to 3 or 4 and the wire width H between 0.8 mm and 1.6 mm, the working efficiency of the motor 1000 can be maximally improved.

[0082] In the embodiment of the present invention, adjacent coils 329 in the coil stack layer 340 are connected by a conductive member (the conductive member is not shown in the figure). For example, the inner ends 331 of adjacent coils 329 are connected by a conductive member. It can be understood that adjacent coils 329 in the coil stack layer 340 can be connected by a blind hole process. For example, the blind hole process is as follows: drill blind holes in the substrate 310, then deburr, and then perform electroless copper plating on the blind holes to metallize the blind holes, so that copper is deposited on the surface of the original insulating substrate, and the deposited copper layer forms a conductive member, thus achieving the effect of electrical connection between layers.

[0083] Referring to Figure 10 As shown, in the embodiment of the present invention, the stator assembly 300 further includes an input terminal A, an input terminal B, and an input terminal C. The input terminal A is connected to any layer of the coil PA1, the input terminal C is connected to any layer of the coil PC1, and the input terminal B is connected to any layer of the coil PB1. It can be understood that the positions of the coil PA1 and the coil PB1 are adjacent, and the coil PC1 is also relatively close to the coil PB1, that is, the positions of the coil PA1, the coil PB1, and the coil PC1 are relatively concentrated, facilitating the routing of the input terminal A, the input terminal B, and the input terminal C, that is, reducing the routing distance and the routing difficulty, simplifying the assembly process, and improving the assembly efficiency.

[0084] Referring to Figure 12 and Figure 19As shown, in the embodiment of the present utility model, along the axial direction of the stator assembly 300, among the multi-layer windings 320, the winding 320 at the uppermost layer is the first-layer winding 320, and the winding 320 at the lowermost layer is the last-layer winding 320. For the convenience of explanation, it is described with the winding 320 having eight layers, the first-layer winding 321 at the uppermost layer, and the eighth-layer winding 328 at the lowermost layer. Two of the input terminals A, B, and C are connected to the corresponding coils 329 in the first-layer winding 321, and the other one of the input terminals A, B, and C is connected to the corresponding coil 329 in the eighth-layer winding 328. For example, the input terminal A is connected to the coil PA1 of the first-layer winding 321, the input terminal C is connected to the coil PC1 of the first-layer winding 321, and the input terminal B is connected to the PB1 of the eighth-layer winding 328. Or, the input terminal A is connected to the coil PA1 of the eighth layer, the input terminal B is connected to the PB1 of the eighth-layer winding 328, and the input terminal C is connected to the coil PC1 of the first-layer winding 321. Specifically, select a suitable solution according to the actual situation.

[0085] Adopting the above solution, since the input terminals A, B, and C are located in the first-layer winding 320 or the last-layer winding 320, it is convenient to lead the input terminals A, B, and C to the connection terminals of the substrate 310, and it is beneficial to control the current flow direction, increase the superposition effect of the magnetomotive force, thereby improving the torque and efficiency of the motor 1000, and reducing the heat concentration and performance degradation caused by uneven current distribution. At the same time, it can also reduce the adverse conditions such as increased vibration, increased noise, and excessive temperature rise caused by voltage imbalance. The connection and wiring between the coils 329 are relatively simple and convenient, which can improve the assembly efficiency of the stator assembly 300.

[0086] As an alternative embodiment, it can also be that one of the input terminals A, B, and C is connected to the corresponding coil 329 in the first-layer winding 321, and the other two of the input terminals A, B, and C are connected to the corresponding coils 329 in the eighth-layer winding 328. Specifically, select a suitable solution according to the actual situation.

[0087] In the embodiment of the present utility model, referring to Figure 12 As shown, the coil RB1 is connected to the coil PB1, and the coil RB2 is connected to the coil PB2, that is, the outer end 332 of the coil RB1 is connected to the outer end 332 of the coil PB1, and the outer end 332 of the coil RB2 is connected to the outer end 332 of the coil PB2. Referring to Figure 19As shown, in the last layer winding 320, for example, in the eighth layer winding 328, coil PA1 and coil RA2 are connected, coil PA2 and coil RA1 are connected, and coil PC1 and coil RC1 are connected. It can be understood that by adopting the above scheme, the current at input terminal A can flow from coil PA1 of the first layer winding 321 to coil PA1 of the eighth layer winding 328, then to coil RA2 of the eighth layer winding 328, and then to coil RA2 of the first layer winding 321. The current flow directions of input terminals B and C are the same and will not be elaborated here. Since each layer winding 320 generates a magnetomotive force after being energized, by reasonably designing the connection mode of coils 329, the magnetomotive forces are superimposed on each other inside the motor 1000, thereby generating a stronger magnetic field and improving the performance of the motor 1000.

[0088] Referring to Figure 12 As shown, in the embodiment of the present utility model, in the first layer winding 321, coil RA2 and coil PA2 are connected; Referring to Figure 13 As shown, in the next layer winding 320 of the first layer winding 321, that is, in the second layer winding 322, coil RC1 and coil RC2 are connected; Referring to Figure 19 As shown, in the last layer winding 320, for example, in the eighth layer winding 328, coil PB2 and coil RB1 are connected. It can be understood that coil RA2 and coil PA2 are connected in the first layer winding 321. Therefore, the current in input terminal A flows from coil PA1 to coil RA2, then through coil RA2 to coil PA2, and finally to coil RA1. The current flow directions of other coils 329 are similar and will not be elaborated here. This enables the current to flow from the first layer winding 321 to the eighth layer winding 328, or from the eighth layer winding 328 to the first layer winding 321, thereby more effectively controlling the current flow direction and increasing the superposition effect of the magnetomotive force, thus improving the torque and efficiency of the motor 1000.

[0089] It should be noted that coil RC1 and coil RC2 are connected in the second layer winding 322 instead of in the first layer winding 321 because when connected in the first layer winding 321, it is easy to contact input terminal C or input terminal A, resulting in adverse effects such as short circuits. Therefore, coil RC1 and coil RC2 are connected in the second layer winding 322 to avoid contacting input terminal C and input terminal A, thereby improving the safety of wire routing and the production efficiency. As an alternative embodiment, it can also be that coil RC1 and coil RC2 of the first layer winding 321 are connected, and an insulating sheet 122 is provided at the position where it contacts input terminal C or input terminal A.

[0090] Referring to Figure 10 As shown, in the embodiment of the present utility model, the stator assembly 300 further includes a common terminal a, a common terminal b, and a common terminal c that are connected, Referring to Figure 12As shown, in the first-layer winding 321, the common terminal a is connected to the coil RA1. Refer to Figure 19 As shown, in the eighth-layer winding 328, the common terminal b is connected to the coil RB2, and the common terminal c is connected to the coil RC2. It can be understood that with the above connection method, the current can pass through most of the coils 329 and finally output from the common terminal a, the common terminal b, and the common terminal c, thereby increasing the superposition effect of the magnetomotive force and improving the torque and efficiency of the motor 1000. It should be noted that as an alternative embodiment, it can also be: in the first-layer winding 321, the common terminal a is connected to the coil RA1, and the common terminal c is connected to the coil RC2. In the eighth-layer winding 328, the common terminal b is connected to the coil RB2. Or, in the first-layer winding 321, the common terminal c is connected to the coil RC2. In the eighth-layer winding 328, the common terminal a is connected to the coil RA1, and the common terminal b is connected to the coil RB2. Specifically, select a suitable solution according to the actual situation.

[0091] An embodiment of a household appliance of the present utility model includes the motor 1000 of the above embodiment. In the household appliance of the embodiment of the present utility model, the motor 1000 of the above embodiment is adopted. By setting the rotating shaft 200 to pass through the installation cavity 110 of the housing 100 and be rotatably connected to the bearing assembly, the stator assembly 300 is located in the installation cavity 110 and fixedly connected to the housing 100, and the first rotor 410 and the second rotor 420 of the rotor assembly 400 are respectively located at both ends of the stator assembly 300 and fixedly connected to the rotating shaft 200. The magnetic field directions of the first rotor 410 and the second rotor 420 are along the axial direction of the rotating shaft 200. The magnetic field of the first rotor 410 enters the second rotor 420 after passing through the stator assembly 300, and then returns to the first rotor 410 after passing through the stator assembly 300 from the second rotor 420, thereby enabling the first rotor 410 and the second rotor 420 to drive the rotating shaft 200 to rotate. Among them, a plurality of coils 329 of the stator assembly 300 are arranged on the substrate 310, so there is no need to set a stator iron core, and there is basically no iron loss. Adopting the scheme of connecting the substrate 310 and the coil 329 can greatly reduce the axial dimension of the stator assembly 300. By setting the first rotor 410 and the second rotor 420 on both sides of the stator assembly 300 along the axial direction respectively, it is beneficial to construct a magnetic field circuit, and the radial dimension of the motor 1000 is small. Therefore, the volume of the motor 1000 can be reduced, which is beneficial to the miniaturization design of the motor 1000.

[0092] Since the household appliance adopts all the technical solutions of the motor 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 elaborated here.

[0093] The embodiments of the present utility model have been described in detail above in conjunction with the accompanying drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the gist of the present utility model within the scope of knowledge possessed by those of ordinary skill in the relevant art.

Claims

1. A motor, characterized in that include: A housing having a mounting cavity formed therein; A bearing assembly, fixedly connected to the housing; A rotating shaft, mounted on the bearing assembly and capable of rotating relative to the housing, one end of the rotating shaft passing through the mounting cavity; A stator assembly is located in the mounting cavity and fixedly connected to the housing, the stator assembly comprising a substrate and a plurality of coils, the substrate being provided with a central hole for the shaft to pass through, and the plurality of coils being provided on the substrate and surrounding the shaft; The rotor assembly includes a first rotor and a second rotor, wherein the first rotor and the second rotor are respectively located at two ends of the stator assembly along the axial direction of the rotating shaft, the first rotor and the second rotor are respectively spaced apart from the stator assembly, and the first rotor and the second rotor are respectively fixedly connected to the rotating shaft.

2. The motor according to claim 1, characterized in that: The bearing assembly includes a first bearing and a second bearing, and the housing includes an outer shell, a first end cover and a second end cover, the first end cover and the second end cover are respectively connected to the two ends of the outer shell along the axial direction, the first end cover is provided with a first mounting groove, the first mounting groove is fixedly provided with the first bearing sleeved on the rotating shaft, and the second end cover is provided with a second mounting groove, the second mounting groove is fixedly provided with the second bearing sleeved on the rotating shaft.

3. The motor according to claim 2, characterized in that: The motor further comprises an elastic member, which is arranged in the first installation groove and located on a side of the first bearing away from the second bearing, and is used to make the inner ring of the first bearing abut against the rotor assembly.

4. The motor according to claim 1, characterized in that: The motor further comprises a shaft sleeve, which is fixedly connected to the rotating shaft. Along the axial direction of the rotating shaft, two ends of the shaft sleeve are respectively fixedly connected to the first rotor and the second rotor.

5. The motor according to claim 1, characterized in that: The inner wall of the shell is provided with a fixing part, and the motor further comprises an insulating sheet, wherein the insulating sheet is located between the fixing part and the stator assembly, and the stator assembly and the fixing part are fixedly connected.

6. The motor according to claim 1, characterized in that: The first rotor comprises a first back iron and a plurality of first permanent magnets, wherein the plurality of first permanent magnets are connected to a side of the first back iron facing the stator assembly and are spaced around the rotating shaft; and / or, The second rotor includes a second back iron and a plurality of second permanent magnets. The plurality of second permanent magnets are connected to a side of the second back iron facing the stator assembly and are spaced around the rotating shaft.

7. The motor according to claim 6, characterized in that: The first back iron comprises a first connecting portion and a first annular portion, the first annular portion is connected to an edge of the first connecting portion, the first annular portion is connected to the first permanent magnet, the first connecting portion is provided with a first positioning mark, and the polarity of the first permanent magnet closest to the first positioning mark is the first polarity; The second back iron includes a second connecting portion and a second annular portion, the second annular portion is connected to the edge of the second connecting portion, the second annular portion is connected to the second permanent magnet, the second connecting portion is provided with a second positioning mark, the polarity of the second permanent magnet closest to the second positioning mark is the second polarity, and the second polarity is opposite to the first polarity.

8. The motor according to claim 7, characterized in that: The motor also includes a sleeve, which is fixedly connected to the rotating shaft. The first connecting portion is provided with a plurality of mounting holes, which are arranged at intervals along the circumference of the rotating shaft. The first connecting portion is passed through the mounting holes by a fastener and is fixedly connected to one end of the sleeve.

9. The motor according to claim 8, characterized in that: The first connecting portion is provided with a plurality of positioning holes, and the plurality of positioning holes and the plurality of mounting holes are alternately arranged along the circumference of the rotating shaft. The sleeve is provided with a plurality of positioning columns, and the plurality of positioning columns and the plurality of positioning holes are matched one-to-one.

10. The motor according to claim 1, characterized in that: The outer wall of the housing is provided with supporting feet, the motor further comprises a vibration-damping sleeve, and the vibration-damping sleeve is wound around the supporting feet; and / or, The outer wall of the shell is provided with a mounting foot, and the mounting foot is provided with a slot. The motor also includes a vibration damper, and the vibration damper includes a connecting column and two vibration damping plates. The two vibration damping plates are connected to the two ends of the connecting column, and the connecting column is clamped in the slot. The two vibration damping plates are respectively located on both sides of the mounting foot along the circumference of the shell.

11. The motor according to claim 1, characterized in that: The stator assembly also includes multiple layers of windings, which are arranged in sequence along the axial direction of the stator assembly and connected to the substrate, and an insulating layer is provided between adjacent windings. The winding includes a plurality of coils and the number of coils in each layer of the winding is the same. The plurality of coils in each layer of the winding are arranged at intervals along the circumferential direction of the stator assembly. The multiple layers of the winding include a plurality of coil stacking layers arranged along the circumferential direction of the stator assembly, and all the coils in each coil stacking layer are connected in sequence.

12. The motor according to claim 11, characterized in that: The number of coils in each layer of the winding is twelve, and all the coil stacking layers are connected via a star connection.

13. A household appliance, characterized in that: Comprising the electric machine as claimed in any one of claims 1 to 12.

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