Rotor assembly, motor and household appliance

Abstract

The embodiment of the invention provides a rotor assembly, a motor and a household appliance. The rotor assembly comprises a rotating shaft and a rotor core, the rotating shaft comprises an assembling part, a plurality of adjusting grooves are formed in the assembling part in the radial direction, and protruding parts are formed among the adjusting grooves; the rotor core is sleeved on the assembling part and abuts against the protruding part. According to the rotor assembly, the motor and the household appliance, the rotating shaft is connected with the rotor core by arranging the assembling part, the multiple adjusting grooves are formed in the assembling part in the radial direction, the protruding parts are formed among the multiple adjusting grooves, the rotor core abuts against the protruding parts, and the resonant frequency of the rotating shaft and the rotor core is adjusted by arranging the multiple adjusting grooves, namely, the rotating shaft is connected with the rotating shaft. The resonant frequency between the rotor assembly and the transmission part is adjusted, so that the resonant rotating speed of the rotor assembly is out of the use rotating speed section of the rotor assembly, the rotor assembly is free of noise within the use rotating speed, the noise of the whole machine is reduced, and the sound quality of the whole machine is improved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a rotor assembly, a motor and a household appliance. Background Art

[0002] After the implementation of the new energy efficiency standard for air conditioners, the development and promotion of new air conditioner DC motors have been accelerated. With the application of extreme design, the motor structure of the new platform has gradually become smaller, the energy density has increased, and the noise problem has become more serious. At the same time, as the product strength has been improved, the air conditioner is required to have no abnormal sound at all speed ranges. In the later stage of motor development and the matching stage of air conditioner adjustment, the resonance phenomenon between the motor and the fan blade of the whole machine often occurs, resulting in noise problems in specific speed ranges, affecting the development progress. Summary of the invention

[0003] The present application provides a rotor assembly, a motor and a household appliance.

[0004] The rotor assembly of the embodiment of the present application includes:

[0005] A rotating shaft, the rotating shaft comprising an assembly portion, a plurality of adjustment grooves are radially provided on the assembly portion, and a convex portion is formed between the plurality of adjustment grooves;

[0006] The rotor core is sleeved on the assembling portion and abuts against the raised portion.

[0007] In some embodiments, the protrusion includes an external surface, the external surface is an arc surface, and the rotor assembly also includes a bearing, and the external surface cooperates with the bearing.

[0008] In some embodiments, the ratio of the moment of inertia of the cross-section of the shaft segment where the assembly portion is provided with the adjustment groove to the moment of inertia of the cross-section of the shaft segment where the assembly portion is not provided with the adjustment groove is less than 1.

[0009] In some embodiments, the ratio of the moment of inertia of the cross section of the shaft section where the adjusting groove is formed in the assembly portion to the moment of inertia of the cross section of the shaft section where the adjusting groove is not formed in the assembly portion is less than 0.7.

[0010] In certain embodiments, the adjustment groove is filled with an injection molding material.

[0011] In some embodiments, the mounting portion is in the shape of a blade.

[0012] In some embodiments, the mounting portion is in a strip shape.

[0013] In some embodiments, the rotating shaft further includes a flat portion, and the flat portion is located at an end of the rotating shaft away from the assembly portion.

[0014] In certain embodiments, the rotor core comprises:

[0015] A plurality of iron cores, wherein the plurality of iron cores are circumferentially arranged, and a receiving groove is formed between two adjacent iron cores;

[0016] A plurality of magnetic tiles, each of which is embedded in one of the receiving grooves;

[0017] The plastic-coated part covers the iron core.

[0018] The motor according to the embodiment of the present application includes the rotor assembly described above.

[0019] The household appliance according to the embodiment of the present application includes the above-mentioned motor.

[0020] In the rotor assembly, motor and household appliance of the embodiments of the present application, the rotating shaft is connected to the rotor core by setting an assembly part, and a plurality of adjustment grooves are radially provided on the assembly part, and a protrusion is formed between the plurality of adjustment grooves, and the rotor core abuts against the protrusion. The resonance frequency of the rotating shaft and the rotor core is adjusted by setting a plurality of adjustment grooves, that is, the resonance frequency between the rotor assembly and the transmission component is adjusted, so that the resonant speed of the rotor assembly is outside the operating speed range of the rotor assembly, thereby ensuring that the rotor assembly is noise-free within the operating speed range, improving the noise of the whole machine, and enhancing the sound quality of the whole machine.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0024] Figure 2 is a schematic structural diagram of a rotating shaft according to an embodiment of the present application;

[0025] Figure 3 is a schematic structural diagram of a rotating shaft according to an embodiment of the present application;

[0026] Figure 4 is a schematic structural diagram of a rotor assembly according to an embodiment of the present application;

[0027] Figure 5 It is a schematic diagram of the structure of a household appliance according to an embodiment of the present application.

[0028] Description of main component symbols:

[0029] Household appliance 1000 , motor 1001 , rotor assembly 100 , rotating shaft 10 , assembly portion 11 , adjustment groove 111 , protrusion 112 , external surface 1121 , flat portion 12 , rotor core 20 , iron core 21 , receiving groove 211 , magnetic tile 22 , overmolded part 23 , bearing 30 . DETAILED DESCRIPTION

[0030] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0031] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0032] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0035] Please combine Figure 1-5 An embodiment of the present application provides a motor 1001 , wherein the motor 1001 includes a rotor assembly 100 , and the rotor assembly 100 includes a rotating shaft 10 and a rotor core 20 .

[0036] Specifically, the rotating shaft 10 and the rotor core 20 are assembled to output power through the rotating shaft 10. The rotating shaft 10 can be connected to a transmission component. The power generated by the rotor core 20 is transmitted to the transmission component through the rotating shaft 10. For example, the transmission component can be a fan impeller, a piston, or other equipment driven by the rotating shaft 10. The rotating shaft 10 includes an assembly portion 11, and the assembly portion 11 includes an adjustment groove 111 and a protrusion 112. The adjustment groove 111 is opened along the radial direction of the assembly portion 11. There can be multiple adjustment grooves 111. When there are multiple adjustment grooves 111, the protrusion 112 is arranged between the multiple adjustment grooves 111. The rotor core 20 is sleeved on the assembly portion 11 and abuts against the protrusion 112. By setting multiple adjustment grooves 111, the torsion height between the rotating shaft 10 and the rotor core 20 can be adjusted, thereby adjusting the resonance frequency between the rotor core 20 and the rotating shaft 10, so as to adjust the resonance frequency between the transmission component connected to the rotor core 20 and the rotating shaft 10, reduce the resonance between the rotor core 20 and the transmission component, and reduce noise.

[0037] In the rotor assembly 100 of the present application, the rotating shaft 10 is connected to the rotor core 20 by setting an assembly part 11, and the assembly part 11 radially opens a plurality of adjustment grooves 111, and a protrusion 112 is formed between the plurality of adjustment grooves 111, and the rotor core 20 abuts against the protrusion 112. By setting a plurality of adjustment grooves 111, the resonance frequency of the rotating shaft 10 and the rotor core 20 is adjusted, that is, the resonance frequency between the rotor assembly 100 and the transmission component is adjusted, so that the resonant speed of the rotor assembly 100 is outside the operating speed range of the rotor assembly 100, thereby ensuring that the rotor assembly 100 is noise-free within the operating speed range, improving the noise of the whole machine, and enhancing the sound quality of the whole machine.

[0038] Further, the rotor core 20 may be provided with an axial hole, which is arranged along the axial direction of the rotor core 20, and the rotating shaft 10 is assembled with the rotor core 20 through the axial hole. The shape of the axial hole is the same as the radial cross-sectional shape of the assembly portion 11, and the radial cross-sectional shape of the assembly portion 11 can be configured according to the plurality of adjustment slots 111. For example, please combine Figure 2 In the case where there are two adjusting grooves 111, the assembly portion 11 is strip-shaped, that is, the protrusion 112 is arranged between the two adjusting grooves 111 in a strip shape, the radial cross-section of the assembly portion 11 is substantially rectangular, and the shaft hole can be arranged as a rectangular hole; please combine Figure 3 In the case where there are three adjustment slots 111, the assembly portion 11 is in the shape of a fan blade, that is, there can be three protrusions 112, and the three adjustment slots 111 are arranged between the three protrusions 112 at intervals. The radial cross section of the assembly portion 11 is basically triangular, and the shaft hole can be arranged as a triangular hole. The number of the adjustment slots 111 can also be four, five, six, etc. The number of the adjustment slots 111 can be configured according to actual conditions and is not limited here.

[0039] In some examples, combine Figure 1 and Figure 3The raised portion 112 includes an outer surface 1121, which may be an arc surface. The outer surface 1121 abuts against the rotor core 20. The rotor assembly 100 also includes a bearing 30. The bearing 30 is used to convert the sliding friction of the rotating shaft 10 into rolling friction, thereby reducing the friction loss of the rotating shaft 10. There may be two bearings 30, which are respectively arranged at the axial ends of the rotor core 20. The assembly portion 11 of the rotating shaft 10 is arranged through the rotor core 20, and the bearing 30 is sleeved on the rotating shaft 10, that is, the bearing 30 is connected to the raised portion 112, and the curvature of the outer surface 1121 is matched with the curvature of the bearing 30, so that the bearing 30 can fit the outer surface 1121. When the rotating shaft 10 rotates, the rotating shaft 10 drives the inner ring of the bearing 30 to rotate. It should be noted that the bearing 30 may also be provided with oil holes and oil grooves. The oil grooves may be used to store lubricating oil for the bearing 30 , and the oil holes may allow the lubricating oil to flow smoothly to form an oil film. By forming an oil film on the bearing 30 , the wear of the bearing 30 may be reduced, the service life of the bearing 30 may be increased, the friction between the bearing 30 and the rotating shaft 10 may be reduced, and the working efficiency of the rotor assembly 100 may be improved.

[0040] In this way, the rotor assembly 100 is provided with a bearing 30 which is sleeved on the rotating shaft 10, and the outer surface 1121 of the protrusion 112 of the rotating shaft 10 cooperates with the bearing 30. The bearings 30 are arranged at both axial ends of the rotor core 20 to support the rotor core 20. By setting the bearings 30, the centrifugal force caused by the rotation of the rotating shaft 10 can be borne and the friction loss during the rotation of the rotating shaft 10 can be reduced.

[0041] It is understandable that the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is provided is smaller than the cross-sectional area where the adjustment slot 111 is not provided. The moment of inertia is used to describe the property of the cross section resisting bending, and the moment of inertia is positively correlated with the area of ​​the cross section, that is, the larger the cross-sectional area, the larger the moment of inertia, and the smaller the cross-sectional area, the smaller the moment of inertia. The ratio of the moment of inertia of the cross section where the rotating shaft 10 of the present application is provided with the adjustment slot 111 to the moment of inertia of the cross section where the adjustment slot 111 is not provided is less than a preset threshold value, that is, the ratio of the cross-sectional area where the rotating shaft 10 is provided with the adjustment slot 111 to the cross-sectional area where the adjustment slot 111 is not provided is less than a preset threshold value, and the preset threshold value can be 1, that is, the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is provided is less than the cross-sectional area where the adjustment slot 111 is not provided.

[0042] Preferably, the preset threshold value may be 0.7, that is, the ratio of the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is provided to the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is not provided may be 0.6, 0.5, 0.4, etc. The smaller the ratio of the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is provided to the cross-sectional area of ​​the rotating shaft 10 where the adjustment slot 111 is not provided, the greater the difference between the resonance frequency between the rotating shaft 10 and the rotor core 20 and the resonance frequency between the rotating shaft 10 and the transmission component, thereby improving the noise reduction effect of the rotor assembly 100 and improving the sound quality of the motor 1001. It should be noted that the rigidity of the rotating shaft 10 can be improved by changing the material of the rotating shaft 10 or strengthening the radial support of the rotating shaft 10 to prevent the rotating shaft 10 from bending or breaking.

[0043] In some embodiments, the axial length of the adjustment slot 111 may account for more than 50% of the axial length of the shaft 10. For example, the axial length of the adjustment slot 111 may be 60%, 70%, 80%, etc. of the axial length of the shaft 10. In this way, the shaft 10 may be applicable to rotor cores 20 of various sizes, so that the application range of the shaft 10 is wider, the production types of the shaft 10 are reduced, and the production efficiency of the shaft 10 is improved.

[0044] In some embodiments, please combine Figure 4 The rotating shaft 10 also includes a flat position 12, which is arranged at the end of the rotating shaft 10 away from the assembly portion 11. The flat position 12 can be formed by milling on a rotating shaft 10 that is difficult to fix, such as a circular shape. The flat position 12 can be in a rectangular, trapezoidal or other shape with certain edges and corners. The flat position 12 is used to assemble transmission components. For example, when the motor 1001 acts on the fan, the rotor assembly 100 is used to drive the fan impeller to rotate, and the flat position 12 is used to assemble with the fan impeller.

[0045] In this way, the rotating shaft 10 is assembled with the transmission component by setting a flat portion 12 at one end of the rotating shaft 10 away from the assembly portion 11, thereby avoiding sliding between the rotating shaft 10 and the transmission component when rotating, and improving the working efficiency of the motor 1001.

[0046] In some embodiments, the ratio of the depth of the flattened position 12 to the radial length of the rotating shaft 10 may be greater than a preset ratio, which may be 0.5. That is, the ratio of the depth of the flattened position 12 to the radial length of the rotating shaft 10 may be 0.6, 0.7, 0.8, etc. Thus, the ratio of the depth of the flattened position 12 to the radial length of the rotating shaft 10 is set to be greater than 0.5. On the one hand, it can prevent the connection between the rotating shaft 10 and the transmission component from being broken due to the excessive depth of the flattened position 12, thereby increasing the service life of the rotating shaft 10. On the other hand, it can reduce the processing time of milling the flattened position 12, thereby improving the production efficiency of the rotating shaft 10.

[0047] See also Figure 4In some embodiments, the rotor core 20 includes a plurality of iron cores 21 , a plurality of magnetic tiles 22 and a molded part 23 .

[0048] Specifically, the iron core 21 is basically fan-shaped, and multiple iron cores 21 are arranged circumferentially, that is, multiple iron cores 21 are arranged around a cylindrical shape, and a receiving groove 211 is formed between two adjacent iron cores 21. The receiving groove 211 is used to accommodate the magnetic tile 22. That is, the number of iron cores 21 and magnetic tiles 22 is equal, and the shape of the magnetic tile 22 is matched with the shape of the receiving groove 211. The magnetic tile 22 is a tile-shaped magnet. For example, the magnetic tile 22 can be a magnet, a magnetic steel or other workpiece containing permanent magnetic materials.

[0049] Furthermore, the overmolded part 23 is provided to cover the iron core 21 and the magnetic tile 22. The overmolded part 23 can be formed by injection molding of a resin material, that is, when a plurality of iron cores 21 and a plurality of magnetic tiles 22 are matched, the iron cores 21 and the magnetic tiles 22 are wrapped by an injection molding process to form the overmolded part 23, and the overmolded part 23 can fill the gap between the iron core 21 and the magnetic tile 22. When the rotor core 20 is sleeved on the assembly part 11 of the rotating shaft 10, the adjustment groove 111 can be filled with the injection molding material by the injection molding process, that is, the overmolded part 23 also covers part of the assembly part 11.

[0050] In some examples, the iron core 21 can be an integrally formed structure or a split-formed structure. When the iron core 21 is an integrally formed structure, the iron core 21 is basically arranged in a circular ring shape, and the center of the iron core 21 is a through hole. The rotating shaft 10 can pass through the through hole to connect with the iron core 21. A circumferentially surrounding receiving groove 21 is arranged in the iron core 21. The receiving groove 211 is used to accommodate magnetic tiles 22. The number of receiving grooves 211 and magnetic tiles 22 can be radially configured according to actual conditions, and is not limited here. The magnetic tiles 22 are embedded in the receiving grooves 211. When the magnetic tiles 22 are embedded in the receiving grooves 211 and the rotating shaft 10 is connected to the iron core 21, the iron core 21 and the magnetic tiles 22 are wrapped by an injection molding process to form a plastic coating 23. The plastic coating 23 can fill the gap between the iron core 21 and the magnetic tiles 22. The plastic coating 23 can also fill the gap between the iron core 21 and the rotating shaft 10, that is, the adjustment groove 111 is filled with injection molding material. The iron core 21 is a split-molding structure which is basically the same as the above-mentioned embodiment and will not be described in detail here.

[0051] In this way, when the iron core 21 and the magnetic tile 22 are matched, the injection molding process is used to wrap the iron core 21 and the magnetic tile 22 to form a plastic overmolded part 23. The injection molding material fills the gap between the iron core 21 and the magnetic tile 22, ensuring that the iron core 21 and the magnetic tile 22 are tightly connected when the rotor assembly 100 rotates at high speed. The injection molding material also fills the gap between the rotor core 20 and the rotating shaft 10, ensuring the tight connection between the rotor core 20 and the rotating shaft 10, ensuring that the rotor core 20 and the rotating shaft 10 rotate synchronously, and improving the performance of the rotor assembly 100.

[0052] See also Figure 5 The embodiment of the present application provides a household appliance 1000, which includes a motor 1001 of any of the above embodiments. The household appliance 1000 may be an electrical device such as a fan, an air conditioner, a washing machine, etc. that needs to be driven by the motor 1001.

[0053] In the rotor assembly 100, the motor 1001 and the household appliance 1000 of the embodiment of the present application, the rotating shaft 10 is connected to the rotor core 20 by setting the assembly part 11, and the assembly part 11 radially opens a plurality of adjustment grooves 111, and a protrusion 112 is formed between the plurality of adjustment grooves 111, and the rotor core 20 abuts against the protrusion 112. By setting the plurality of adjustment grooves 111, the resonance frequency of the rotating shaft 10 and the rotor core 20 is adjusted, so that the resonant speed of the rotor assembly 100 is outside the operating speed range of the rotor assembly 100, thereby ensuring that the rotor assembly 100 is noise-free within the operating speed range, improving the noise of the whole machine, and enhancing the sound quality of the whole machine.

[0054] In the description of this specification, the description with reference to the terms "one embodiment", "certain embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0055] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly, characterized in that: include: A rotating shaft, the rotating shaft comprising an assembly portion, a plurality of adjustment grooves are radially provided on the assembly portion, and a convex portion is formed between the plurality of adjustment grooves; The rotor core is sleeved on the assembling portion and abuts against the raised portion.

2. The rotor assembly according to claim 1, characterized in that The protrusion includes an outer surface, which is an arc surface. The rotor assembly also includes a bearing, and the outer surface cooperates with the bearing.

3. The rotor assembly according to claim 1, characterized in that: The ratio of the moment of inertia of the cross section of the shaft section where the assembly portion is provided with the adjustment groove to the moment of inertia of the cross section of the shaft section where the assembly portion is not provided with the adjustment groove is less than 1.

4. The rotor assembly according to claim 3, characterized in that: The ratio of the moment of inertia of the cross section of the shaft section where the assembly portion is provided with the adjustment groove to the moment of inertia of the cross section of the shaft section where the assembly portion is not provided with the adjustment groove is less than 0.

7.

5. The rotor assembly according to claim 1, characterized in that: The adjustment groove is filled with injection molding material.

6. The rotor assembly according to claim 1, characterized in that The assembly portion is in the shape of a fan blade.

7. The rotor assembly according to claim 1, characterized in that The assembly portion is in a strip shape.

8. The rotor assembly according to claim 1, characterized in that The rotating shaft further comprises a flat portion, and the flat portion is located at an end of the rotating shaft away from the assembling portion.

9. The rotor assembly according to claim 1, characterized in that: The rotor core comprises: A plurality of iron cores, wherein the plurality of iron cores are circumferentially arranged, and a receiving groove is formed between two adjacent iron cores; A plurality of magnetic tiles, each of which is embedded in one of the receiving grooves; The plastic-coated part covers the iron core.

10. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 9.

11. A household appliance, characterized in that: Comprising the motor as claimed in claim 10.

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