Rotor core, rotor assembly, motor and household appliance

Abstract

The utility model discloses a rotor core, a rotor assembly, a motor and a household electrical appliance, and relates to the technical field of motors, the rotor core comprises a plurality of punching sheets, the plurality of punching sheets comprise a first punching sheet, the first punching sheet comprises N first fan-shaped parts arranged around the rotation axis of a rotating shaft, one ends, facing the rotating axis of the rotating shaft, of part of the first fan-shaped parts are connected through connecting parts. A rotor iron core comprises a plurality of punching sheets which are stacked along a rotating axis of a rotating shaft, the plurality of punching sheets comprise a first punching sheet, the first punching sheet comprises a plurality of first fan-shaped parts, one end, facing the rotating axis, of a part of the first fan-shaped parts is connected through a connecting part, and the other part of the first fan-shaped parts are not connected. Therefore, while the structural strength of the rotor core is ensured, the magnetic leakage of the permanent magnets is reduced, and the working efficiency of the motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, and particularly relates to a rotor core, a rotor assembly, a motor and a household appliance. Background Art

[0002] In the related art, permanent magnet motors can be used in household appliances such as air conditioners, refrigerators, washing machines, and vacuum cleaners to drive corresponding components to rotate. The permanent magnet motor includes a rotor core, and the rotor core includes a plurality of rotor punching sheets. The rotor punching sheet has an annular connecting portion and a plurality of fan-shaped portions. The plurality of fan-shaped portions are connected to the connecting portion through magnetic bridges and are arranged around the connecting portion. Permanent magnets are arranged between adjacent fan-shaped portions. When adopting this scheme, the magnetic leakage of the rotor core is relatively serious, resulting in a reduction in the efficiency of the permanent magnet motor. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this purpose, the utility model provides a rotor core, which can reduce magnetic leakage to improve the working efficiency of the motor.

[0004] The utility model also provides a rotor assembly, a motor and a household appliance having the above rotor core.

[0005] The rotor core according to the first aspect embodiment of the utility model is applied to a rotor assembly having a rotating shaft. The rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft. The plurality of punching sheets include a first punching sheet. The first punching sheet includes N first fan-shaped portions arranged around the rotation axis. Along the radial direction of the rotor core, one end of some of the first fan-shaped portions facing the rotation axis is connected through a connecting portion, where N is an even number greater than 2.

[0006] The rotor core according to the embodiment of the utility model has at least the following beneficial effects:

[0007] By providing that the rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft, the plurality of punching sheets include a first punching sheet, the first punching sheet includes a plurality of first fan-shaped portions, one end of some of the first fan-shaped portions facing the rotation axis is connected through a connecting portion, and the other part of the first fan-shaped portions is not connected. Therefore, while ensuring the structural strength of the rotor core, the magnetic leakage of the permanent magnet is reduced, and the working efficiency of the motor is improved.

[0008] According to some embodiments of the utility model, every two adjacent first fan-shaped portions form a pair of first fan-shaped groups. The first punching sheet includes N / 2 pairs of the first fan-shaped groups, and each pair of the first fan-shaped groups is spaced apart. The two first fan-shaped portions of each pair of the first fan-shaped groups are both connected through the connecting portion.

[0009] According to some embodiments of the present utility model, M1 adjacent first sector portions form a second sector group, and the M1 first sector portions of the second sector group are connected by the connecting portion, where M1 is a natural number, and N > 2, 2 < M1 < N.

[0010] According to some embodiments of the present utility model, M2 adjacent first sector portions form a third sector group, and along the circumferential direction of the rotor core, the first sector portions located on both sides in the third sector group are connected by the connecting portion, where M2 is a natural number, and N > 2, 3 ≤ M2 < N.

[0011] According to some embodiments of the present utility model, the connecting portion includes an arc segment and a plurality of first connecting bridges. The arc segment surrounds a partial outer peripheral wall of the rotating shaft and is connected to the rotating shaft. Two ends of the plurality of first connecting bridges are respectively connected to the arc segment and the corresponding first sector portion.

[0012] According to some embodiments of the present utility model, along the direction of the rotation axis, adjacent two first punching sheets rotate M3 * 360 / N degrees along the circumferential direction of the rotor core, where M3 is a natural number, and 1 ≤ M3 < N.

[0013] According to some embodiments of the present utility model, along the direction of the rotation axis, among adjacent two first punching sheets, the latter first punching sheet rotates 360 / N degrees relative to the former first punching sheet in the same rotation direction.

[0014] According to some embodiments of the present utility model, the plurality of punching sheets further includes a second punching sheet. The second punching sheet includes an inner iron core, a plurality of second sector portions arranged outside the inner iron core, and a plurality of second connecting bridges extending along the radial direction. The inner iron core is annular and is connected to the rotating shaft. The number of the second sector portions is equal to the number of the second connecting bridges, and the second sector portions are respectively connected to the inner iron core through the corresponding second connecting bridges.

[0015] According to some embodiments of the present utility model, at least one second punching sheet is located at at least one end of the rotor core along the rotation axis, and the first sector portion and the second sector portion are stacked along the direction of the rotation axis.

[0016] According to a rotor assembly of the second aspect embodiment of the present utility model, it includes the rotor core described in the above embodiments. The rotor core includes a plurality of core units arranged around the rotation axis, and an installation groove is formed between adjacent core units;

[0017] A plurality of permanent magnets are respectively installed in the corresponding installation grooves.

[0018] The rotor assembly according to the embodiment of the present utility model has at least the following beneficial effects:

[0019] By providing that the rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft, the plurality of punching sheets include a first punching sheet, the first punching sheet includes a plurality of first fan-shaped portions, one end of some of the first fan-shaped portions facing the rotation axis is connected through a connecting portion, and the other part of the first fan-shaped portions are not connected. Therefore, while ensuring the structural strength of the rotor core, the leakage of permanent magnets is reduced, and the working efficiency of the motor is improved.

[0020] The motor according to the third aspect embodiment of the present utility model includes a stator assembly and the rotor assembly described in the above embodiments, and the stator assembly is disposed around the outer side of the rotor assembly.

[0021] The motor according to the embodiment of the present utility model has at least the following beneficial effects:

[0022] By providing that the rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft, the plurality of punching sheets include a first punching sheet, the first punching sheet includes a plurality of first fan-shaped portions, one end of some of the first fan-shaped portions facing the rotation axis is connected through a connecting portion, and the other part of the first fan-shaped portions are not connected. Therefore, while ensuring the structural strength of the rotor core, the leakage of permanent magnets is reduced, and the working efficiency of the motor is improved.

[0023] The household appliance according to the fourth aspect embodiment of the present utility model includes the motor described in the above embodiments.

[0024] The household appliance according to the embodiment of the present utility model has at least the following beneficial effects:

[0025] By providing that the rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft, the plurality of punching sheets include a first punching sheet, the first punching sheet includes a plurality of first fan-shaped portions, one end of some of the first fan-shaped portions facing the rotation axis is connected through a connecting portion, and the other part of the first fan-shaped portions are not connected. Therefore, while ensuring the structural strength of the rotor core, the leakage of permanent magnets is reduced, and the working efficiency of the motor is improved, thereby improving the energy efficiency of the household appliance.

[0026] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. Description of the Drawings

[0027] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0028] Figure 1 is a schematic structural diagram of a rotor assembly and a stator assembly according to an embodiment of the present utility model;

[0029] Figure 2Structural schematic diagram of the first punching piece of the first embodiment of the present utility model;

[0030] Figure 3 Structural schematic diagram of the first fan-shaped group of an embodiment of the present utility model;

[0031] Figure 4 Structural schematic diagram of the first punching piece of the second embodiment of the present utility model;

[0032] Figure 5 Structural schematic diagram of the first punching piece of the third embodiment of the present utility model;

[0033] Figure 6 Structural schematic diagram of multiple first punching pieces of the first embodiment of the present utility model stacked after circumferential rotation;

[0034] Figure 7 Structural schematic diagram of multiple first punching pieces of the first embodiment of the present utility model directly stacked;

[0035] Figure 8 Structural schematic diagram of the second punching piece of the first embodiment of the present utility model;

[0036] Figure 9 Structural schematic diagram of multiple first punching pieces and multiple second punching pieces of the first embodiment of the present utility model.

[0037] Reference numerals in the drawings:

[0038] Rotor assembly 1000;

[0039] Rotor core 100;

[0040] First punching piece 200; connecting portion 210; arc segment 211; first connecting bridge 212; first fan-shaped group 220; first fan-shaped portion 221; second fan-shaped group 230; third fan-shaped group 240;

[0041] Second punching piece 300; inner core 310; second fan-shaped portion 320; second connecting bridge 330;

[0042] Core unit 400; installation groove 410; permanent magnet 411;

[0043] Installation space 500; rotating shaft 510;

[0044] Stator assembly 2000; stator core 2100; winding 2200. Detailed implementation manners

[0045] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are only used to explain the present utility model, and should not be construed as a limitation of the present utility model.

[0046] In the description of the present utility model, it should be understood that with regard to the orientation description, such as up, down, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It 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 of the present utility model.

[0047] In the description of the present utility model, "a plurality of" means more than two. If there is a description of first and second, it is only for the purpose of distinguishing technical features and should not be construed 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.

[0048] 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 meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0049] The motor is a component that plays an important role in household appliances. For example, the motor for driving the impeller in an air conditioner, the motor assembly inside the compressor, the motor of a washing machine, the motor of a dishwasher, and so on. With the development of the household appliance industry, miniaturization and high power have become the development direction of the new generation of motors.

[0050] A motor generally includes a stator assembly and a rotor assembly. The rotor assembly rotates around the rotation axis of the motor, and the stator assembly is arranged around the rotation axis. Under the action of the electromagnetic field, the rotor assembly can rotate relative to the stator assembly, thereby driving the load connected to the output end of the motor to rotate. It can be understood that in one embodiment, the stator assembly is configured to be arranged outside the rotor assembly, which is an inner rotor motor; in another embodiment, the stator assembly is configured to be arranged inside the rotor assembly, which is an outer rotor motor.

[0051] To facilitate the understanding of the solution of the embodiments of the present utility model, the following takes the inner rotor motor as an example for description.

[0052] Refer to Figure 1As shown in the figure, the motor of the embodiment of the present utility model includes a stator assembly 2000 and a rotor assembly 1000. The rotor assembly 1000 includes a rotating shaft 510, and the central axis of the rotating shaft 510 coincides with the rotation axis of the motor. The stator assembly 2000 is arranged around the outer side of the rotor assembly 1000. In order to improve the stability and reliability of the motor, the rotor assembly 1000 and the stator assembly 2000 are generally subjected to plastic coating treatment respectively and then assembled. The rotor assembly 1000 includes a rotor core 100, a plurality of permanent magnets 411 and a rotating shaft 510. The rotor core 100 is provided with a plurality of mounting grooves 410, and the plurality of permanent magnets 411 are respectively mounted in the corresponding mounting grooves 410 one by one. The rotating shaft 510 is mounted inside the rotor core 100. The assembled rotor core 100, a plurality of permanent magnets 411 and the rotating shaft 510 are connected by an integral injection molding process, which is the plastic coating treatment of the rotor assembly 1000. The stator assembly 2000 includes a stator core 2100, an insulating frame and a winding 2200, and the insulating frame is not shown in the figure. The assembled stator core 2100, insulating frame and winding 2200 are connected by an integral injection molding process, which is the plastic coating treatment of the stator assembly 2000. It should be noted that the plastic coating treatment of the stator assembly 2000 generally forms a part of the motor housing at the same time, so as to facilitate rapid assembly with the rotor assembly 1000. After the plastic coating treatment, both the rotor assembly 1000 and the stator assembly 2000 can obtain a more stable structure, making it not easy for the internal components to separate, and improving the connection stability between the components.

[0053] Due to the magnetic leakage of the permanent magnet 411, that is, a part of the magnetic field fails to completely enter the expected magnetic circuit and is dissipated to other places, resulting in a reduction in the magnetic field that the motor can utilize, thereby reducing the efficiency of the motor. For example, if the magnetic leakage is caused by the rotor core 100, a part of the magnetic field will be dissipated to other places in the magnetic circuit formed by the rotor core 100.

[0054] In order to reduce magnetic leakage and improve the working efficiency of the motor, refer to Figure 2 As shown in the figure, a rotor core 100 of an embodiment of the present utility model is applied to a rotor assembly 1000 having a rotating shaft 510. The rotor core 100 includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft 510. The plurality of punching sheets include a first punching sheet 200. The first punching sheet 200 includes N first fan-shaped portions 221, and the N first fan-shaped portions 221 are arranged around the rotation axis of the rotating shaft 510, where N is an even number greater than 0. Along the radial direction of the rotor core 100, one end of some of the first fan-shaped portions 221 facing the rotation axis of the rotating shaft 510 is connected by a connecting portion 210.

[0055] It can be understood that, by adopting the above solution, the number of the first sector portions 221 is set to an even number greater than 0. Therefore, the number of the permanent magnets 411 is also an even number, enabling the permanent magnets 411 to be arranged in pairs, ensuring uniform magnetic field distribution, and improving the stability during the operation of the motor. When the magnetic field generated by the permanent magnets 411 is transmitted along the magnetic circuit formed by the first sector portions 221 and the connecting portions 210, since not all of the first sector portions 221 are connected through the connecting portions 210 and a plastic-coated body is usually provided between adjacent first sector portions 221, and the magnetic field conduction ability of the plastic-coated body is poor, the transmission of the magnetic field is blocked. Therefore, while ensuring the structural strength of the rotor core 100 by using the connecting portions 210, the magnetic leakage can be reduced and the working efficiency of the motor can be improved.

[0056] Referring Figure 3 As shown, in the embodiment of the present utility model, the connecting portion 210 includes an arc segment 211 and a plurality of first connecting bridges 212. The arc segment 211 is disposed around a part of the outer wall of the rotating shaft 510 and is connected to the rotating shaft 510. The arc segment 211 plays a positioning role and can determine the position of the rotating shaft 510. The two ends of the plurality of first connecting bridges 212 are respectively connected to the arc segment 211 and the corresponding first sector portion 221. Therefore, the first connecting bridges 212 play a role in connecting the first sector portion 221 and the arc segment 211, can determine the relative positions between the first arc segment 211 and the first sector portion 221, facilitate assembly, and improve the assembly efficiency.

[0057] It should be noted that, in another embodiment, in addition to adopting the arc segment 211, it can also be a connecting segment of other shapes. For example, the connecting segment is a straight long strip or a cylindrical shape, and the two ends of the first connecting bridge 212 are respectively connected to the corresponding first sector portion 221 and the connecting segment. Specifically, a suitable shape is selected according to the actual situation. For the convenience of explanation, the arc segment 211 is used in the subsequent embodiments for description.

[0058] Referring Figure 2 and Figure 3As shown, in the first embodiment of the present utility model, the structural form of the first punching sheet 200 can be: every two adjacent first fan-shaped parts 221 form a pair of first fan-shaped groups 220, that is, the first punching sheet 200 includes N / 2 pairs of first fan-shaped groups 220, and each pair of first fan-shaped groups 220 is arranged at intervals. The two first fan-shaped parts 221 of each pair of first fan-shaped groups 220 are both connected by a connecting part 210. For example, N is 10, that is, the number of first fan-shaped parts 221 is set to 10, and the 10 first fan-shaped parts 221 are arranged around the rotating shaft 510. And the number of first fan-shaped groups 220 is 5 pairs, and each pair of first fan-shaped groups 220 includes 2 first fan-shaped parts 221. Of course, N can also be 6, 8, 12, 14, etc., and the specific number is selected according to the actual situation. When part of the magnetic field of the permanent magnet 411 is transmitted along the first fan-shaped group 220, since the adjacent first fan-shaped groups 220 are arranged at intervals, it is difficult for the magnetic field to be transmitted from one first fan-shaped group 220 to another adjacent first fan-shaped group 220, effectively blocking the transmission of the magnetic field and reducing magnetic leakage.

[0059] For the convenience of positioning and installing the rotating shaft 510, referring to Figure 6 As shown, in the embodiment of the present utility model, for the first punching sheet 200 of the first type, along the direction of the rotation axis of the rotating shaft 510, two adjacent first punching sheets 200 rotate M3*360 / N degrees circumferentially along the rotor core 100, where M3 is a natural number and 1≤M3<N. For example, M3 is 1 and N is 10, that is, the subsequent first punching sheet 200 rotates 36° clockwise or counterclockwise in the same direction relative to the previous first punching sheet 200, so that an installation space 500 for assembling the rotating shaft 510 is formed between the arc-shaped segments 211 of the plurality of connecting parts 210, and the installation space 500 plays a role in positioning the rotating shaft 510. Therefore, while reducing magnetic leakage, the rotor core 100 can also improve the assembly efficiency of the rotor core 100 and the rotating shaft 510 and ensure the stability of the connection between the rotor core 100 and the rotating shaft 510. It should be noted that N can also be 6, 8, 12, 14, etc., and M3 can also be 2, 3, 4, etc. As long as M3 is less than N, the rotation angle of the first punching sheet 200 can also be 30°, 45°, 60°, etc. In addition, when the subsequent first punching sheet 200 rotates relative to the previous first punching sheet 200, it can also be in different directions. For example, the subsequent first punching sheet 200 rotates clockwise and the previous first punching sheet 200 rotates counterclockwise, and the rotation angle can be random, that is, the rotation angle of each first punching sheet 200 is not fixed.

[0060] For the first type of first punching sheet 200, in addition to the possibility that the subsequent first punching sheet 200 rotates relative to the previous first punching sheet 200, in another embodiment, a plurality of first punching sheets 200 can form a punching sheet group. The plurality of first punching sheets 200 in the first punching sheet group are directly stacked without relative rotation. The subsequent punching sheet group rotates M3 * 360 / N degrees relative to the previous punching sheet group. Similarly, an installation space 500 for assembling the rotating shaft 510 can be formed between the arc segments 211 of the plurality of connecting portions 210. Specifically, a suitable solution is selected according to the actual situation.

[0061] Referring to Figure 7 As shown, in another embodiment of the present invention, for the first type of first punching sheet 200, the subsequent first punching sheet 200 does not rotate relative to the previous first punching sheet 200. All the first punching sheets 200 are directly stacked along the axial direction of the rotating shaft 510, which can simplify the assembly steps and improve the installation efficiency.

[0062] Referring to Figure 4 As shown, in the second embodiment of the present invention, the structural form of the first punching sheet 200 can also be: M1 adjacent first sector portions 221 form a second sector group 230. The M1 first sector portions 221 of the second sector group 230 are connected by a connecting portion 210, where M1 is a natural number, and N > 2, 2 < M1 < N. For example, there are 2 second sector groups 230, and each second sector group 230 includes 5 first sector portions 221. The 5 first sector portions 221 are all connected by a connecting portion 210. Since the connecting portion 210 includes an arc segment 211 and M1 first connecting bridges 212, the five first sector portions 221 are respectively connected by the corresponding first connecting bridges 212 and a connecting portion 210. In this embodiment, the adjacent second sector groups 230 are separated, so the transmission of the magnetic field can be blocked to reduce magnetic leakage. In another embodiment, in addition to being 5, M1 can also be other numbers, such as M1 can be 3, 4, 6, etc. Specifically, a suitable solution is selected according to the actual situation.

[0063] In order to facilitate the positioning and installation of the rotating shaft 510, in the embodiment of the utility model, for the second type of first punching sheet 200, along the direction of the rotation axis of the rotating shaft 510, two adjacent first punching sheets 200 rotate M3*360 / N degrees along the circumference of the rotor core 100, where M3 is a natural number, and 1≤M3<N. For example, M3 is 1, and N is 10, that is, each first punching sheet 200 rotates 36° along the circumference of the rotor core 100 relative to the previous first punching sheet 200, so that an installation space 500 for assembling the rotating shaft 510 is formed between the arc segments 211 of the multiple connecting parts 210, and the installation space 500 plays the role of positioning the rotating shaft 510. Therefore, the rotor core 100 can reduce magnetic leakage while improving the efficiency of assembling the rotor core 100 and the rotating shaft 510, and ensure the stability of the connection between the rotor core 100 and the rotating shaft 510. It should be noted that N can also be 6, 8, 12, 14, etc., and M3 can also be 2, 3, 4, etc., as long as M3 is smaller than N. Therefore, the rotation angle of the first punch 200 can also be 30°, 45°, 60°, etc.

[0064] For the second type of first punching sheet 200, in addition to the latter first punching sheet 200 being rotated relative to the former first punching sheet 200, in another embodiment, multiple first punching sheets 200 may constitute a punching sheet group, and multiple first punching sheets 200 in the first punching sheet group 200 are directly stacked without relative rotation. The latter punching sheet group is rotated M3*360 / N degrees relative to the former punching sheet group, and the installation space 500 for assembling the rotating shaft 510 can also be formed between the arc segments 211 of the multiple connecting parts 210. The appropriate solution is selected according to the actual situation.

[0065] In another embodiment of the utility model, for the second type of first punch 200, the latter first punch 200 does not rotate relative to the former first punch 200, and all the first punches 200 are directly stacked along the axial direction of the rotating shaft 510, which can simplify the assembly steps and improve the installation efficiency.

[0066] Reference Figure 5As shown, in the third embodiment of the utility model, the structure of the first punching sheet 200 can also be: adjacent M2 first sector portions 221 form a third sector group 240, along the circumferential direction of the rotor core 100, the first sector portions 221 located on both sides of the third sector group 240 are connected by the connecting portion 210, wherein M2 is a natural number and satisfies N>2, 3≤M2<N. For example, the connecting portion 210 includes an arc segment 211 and two first connecting bridges 212. When M2 is 3, that is, the third sector group 240 includes 3 first sector portions 221, and the first sector portions 221 on both sides of the first sector portion 221 located in the middle are connected to the same arc segment 211 through the corresponding first connecting bridges 212. In this embodiment, a small portion of the first sector portion 221 is connected to the arc segment 211 through the first connecting bridge 212, while the other portion of the first sector portion 221 and the arc segment 211 are partitioned. Since there are plastic overmolding parts between adjacent first sector portions 221 and between the partitioned first sector portions 221 and the arc segment 211, and the magnetic field conduction ability of the plastic overmolding parts is poor, it is possible to more effectively reduce leakage flux, thereby improving the working efficiency of the motor.

[0067] In order to facilitate the positioning and installation of the rotating shaft 510, in the embodiment of the utility model, for the third type of first punching sheet 200, along the direction of the rotation axis of the rotating shaft 510, two adjacent first punching sheets 200 rotate M3*360 / N degrees along the circumference of the rotor core 100, where M3 is a natural number, and 1≤M3<N. For example, M3 is 1, and N is 10, that is, each first punching sheet 200 rotates 36° along the circumference of the rotor core 100 relative to the previous first punching sheet 200, so that an installation space 500 for assembling the rotating shaft 510 is formed between the arc segments 211 of the multiple connecting parts 210, and the installation space 500 plays the role of positioning the rotating shaft 510. Therefore, the rotor core 100 can reduce magnetic leakage while improving the efficiency of assembling the rotor core 100 and the rotating shaft 510, and ensure the stability of the connection between the rotor core 100 and the rotating shaft 510. It should be noted that N can also be 6, 8, 12, 14, etc., and M3 can also be 2, 3, 4, etc., as long as M3 is smaller than N. Therefore, the rotation angle of the first punch 200 can also be 30°, 45°, 60°, etc.

[0068] For the third type of first punching sheet 200, in addition to the latter first punching sheet 200 being rotated relative to the former first punching sheet 200, in another embodiment, multiple first punching sheets 200 may constitute a punching sheet group, and multiple first punching sheets 200 in the first punching sheet group 200 are directly stacked without relative rotation. The latter punching sheet group is rotated M3*360 / N degrees relative to the former punching sheet group, and the installation space 500 for assembling the rotating shaft 510 can also be formed between the arc segments 211 of the multiple connecting parts 210. The appropriate solution is selected according to the actual situation.

[0069] In another embodiment of the present utility model, for the third type of first punching piece 200, the subsequent first punching piece 200 does not rotate relative to the previous first punching piece 200, and all the first punching pieces 200 are directly stacked along the axial direction of the rotating shaft 510, which can simplify the assembly steps and improve the installation efficiency.

[0070] It should be noted that when multiple punching pieces are stacked along the axial direction of the rotating shaft 510, the punching pieces may simultaneously include the first type of first punching piece 200, the second type of first punching piece 200, and the third type of first punching piece 200. Or, it may also include any one or two of the first type of first punching piece 200, the second type of first punching piece 200, and the third type of first punching piece 200, and a suitable solution is selected according to the actual situation.

[0071] It can be understood that compared with the first type of first punching piece 200, in the second type of first punching piece 200, since more first fan-shaped portions 221 are connected by the first connecting bridge 212 and the arc segment 211, the structural strength of the second type of first punching piece 200 is higher than that of the first type of first punching piece 200. Therefore, a suitable first punching piece 200 can be selected according to different requirements for structural strength. Compared with the first type of first punching piece 200 and the second type of first punching piece 200, since some of the first fan-shaped portions 221 and the arc segment 211 of the third type of first punching piece 200 are not connected by the first connecting bridge 212, when the number of first fan-shaped portions 221 of the first type of first punching piece 200, the second type of first punching piece 200, and the third type of first punching piece 200 is the same, the third type of first punching piece 200 can reduce magnetic leakage to a greater extent and improve the working efficiency of the motor. Therefore, a suitable first punching piece 200 is selected according to the actual demand for magnetic leakage.

[0072] For example, when the requirement for structural strength is higher, the second type of first punching piece 200 can be selected; when the requirement for reducing magnetic leakage is higher, the third type of first punching piece 200 can be selected; when both structural strength and magnetic leakage need to be considered, the first type of first punching piece 200 can be selected. Or, the first type of first punching piece 200, the second type of first punching piece 200, and the third type of first punching piece 200 can also be selected simultaneously, or any two of them can be combined.

[0073] Refer to Figure 8As shown, in an embodiment of the present utility model, the plurality of punching sheets further includes a second punching sheet 300. The second punching sheet 300 includes an inner iron core 310, a plurality of second sector portions 320, and a plurality of second connecting bridges 330 extending radially. The plurality of second sector portions 320 are disposed around the outer side of the inner iron core 310. The inner iron core 310 is annular and connected to the rotating shaft 510. The number of the second sector portions 320 is equal to the number of the second connecting bridges 330. The second sector portions 320 are respectively connected to the inner iron core 310 through the corresponding second connecting bridges 330, that is, the plurality of second sector portions 320 are arranged radially.

[0074] Among them, the first punching sheet 200 and the second punching sheet 300 can be used in cooperation. Refer to Figure 9 As shown, in the embodiment of the present utility model, at least one second punching sheet 300 is located at the end of at least one end of the rotor core 100 along the rotation axis. The first sector portion 221 and the second sector portion 320 are stacked in the direction of the rotation axis of the rotating shaft 510. For example, second punching sheets 300 are provided at both ends of the rotor core 100, and the number of the second punching sheets 300 can be multiple. Or one second punching sheet 300 is provided at each of the two ends of the rotor core 100; or multiple stacked second punching sheets 300 are provided at one end of the rotor core 100; or one second punching sheet 300 is provided at one end of the rotor core 100. Specifically, a suitable scheme is selected according to the actual situation.

[0075] It can be understood that the first punching sheet 200 can reduce the magnetic leakage of the permanent magnet 411, and the second punching sheet 300 located at the end of at least one end of the rotor core 100 along the rotation axis can play a role in positioning the rotating shaft 510, improving the installation accuracy and the yield rate of the rotor core 100 and the rotating shaft 510. Therefore, the combination of the first punching sheet 200 and the second punching sheet 300 can achieve better effects. While reducing the magnetic leakage of the permanent magnet 411, it can also take into account the assembly accuracy of the rotating shaft 510 and the rotor core 100.

[0076] Refer to Figure 1 As shown, the rotor assembly 1000 of an embodiment of the present utility model includes the rotor core 100 of the above embodiment. Refer to Figure 6 As shown, the rotor core 100 includes a plurality of core units 400 disposed around the rotation axis of the rotating shaft 510. The core units 400 are formed by stacking a plurality of first sector portions 221 and / or a plurality of second sector portions 320 along the axial direction of the rotating shaft 510. Installation grooves 410 are formed between two adjacent core units 400, that is, there are a plurality of installation grooves 410. A plurality of permanent magnets 411 are correspondingly installed in the installation grooves 410. Subsequently, the relative positions between the permanent magnets 411 and the core units 400 can be fixed by means of plastic encapsulation.

[0077] The rotor assembly 1000 of the embodiment of the present utility model, by adopting the rotor core 100 of the above embodiment, by setting the number of the first sector portions 221 to be an even number greater than 0, so the number of the permanent magnets 411 is also an even number, enabling the permanent magnets 411 to be arranged in pairs, ensuring uniform magnetic field distribution, and improving the stability during the operation of the motor. The first punching sheet 200 includes a plurality of first sector portions 221, and one ends of some of the first sector portions 221 facing the rotation axis are connected through the connecting portions 210. When the magnetic field generated by the permanent magnets 411 is transmitted along the magnetic path formed by the first sector portions 221 and the connecting portions 210, since not all of the first sector portions 221 are connected through the connecting portions 210, the transmission of the magnetic field is blocked, so that magnetic leakage can be reduced and the working efficiency of the motor can be improved. The first punching sheets 200 can be stacked along the rotation axis of the rotating shaft 510, and each first punching sheet 200 rotates a specific angle and then is stacked, so that an installation space 500 for assembling the rotating shaft 510 is formed between the plurality of connecting portions 210, playing a role in positioning the rotating shaft 510. Therefore, while reducing magnetic leakage, the rotor core 100 can also improve the assembly efficiency of the rotor core 100 and the rotating shaft 510, and ensure the stability of the connection between the rotor core 100 and the rotating shaft 510.

[0078] Since the rotor assembly 1000 of the embodiment of the present utility model adopts all the technical solutions of the rotor core 100 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.

[0079] A motor according to an embodiment of the present utility model is a permanent magnet motor, including a stator assembly 2000 and the rotor assembly 1000 of the above embodiment, and the stator assembly 2000 is arranged around the outside of the rotor assembly 1000. By adopting the rotor assembly 1000 of the above embodiment, since one ends of some of the first sector portions 221 of the rotor core 100 facing the rotation axis are connected through the connecting portions 210. When the magnetic field generated by the permanent magnets 411 is transmitted along the magnetic path formed by the first sector portions 221 and the connecting portions 210, since not all of the first sector portions 221 are connected through the connecting portions 210, the transmission of the magnetic field is blocked, so that magnetic leakage can be reduced and the working efficiency of the motor can be improved.

[0080] Since the motor of the embodiment of the present utility model adopts all the technical solutions of the rotor assembly 1000 of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment, which will not be elaborated here.

[0081] An embodiment of a household appliance according to the present utility model includes the motor of the above embodiment. The household appliance can be an air conditioner, a washing machine, a dishwasher, a refrigerator, etc. By adopting the motor of the above embodiment, since one end of a part of the first sector portion 221 of the rotor core 100 facing the rotation axis is connected through the connecting portion 210. When the magnetic field generated by the permanent magnet 411 is transmitted along the magnetic path formed by the first sector portion 221 and the connecting portion 210, since not all of the first sector portions 221 are connected through the connecting portion 210, the transmission of the magnetic field is blocked, so that magnetic leakage can be reduced, the working efficiency of the motor can be improved, and thus the reliability of the household appliance can be improved.

[0082] Since the household appliance of the embodiment of the present utility model adopts all the technical solutions of the motor 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 herein.

[0083] The embodiments of the present utility model have been described in detail above with reference to the drawings. However, the present utility model is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present utility model within the scope of knowledge possessed by those of ordinary skill in the art.

Claims

1. Rotor core, applied to a rotor assembly having a rotating shaft, characterized in that: The rotor core includes a plurality of punching sheets stacked along the rotation axis of the rotating shaft. The plurality of punching sheets include a first punching sheet. The first punching sheet includes N first sector portions arranged around the rotation axis. Along the radial direction of the rotor core, one end of some of the first sector portions facing the rotation axis is connected by a connecting portion, where N is an even number greater than 2. The connecting portion includes an arc segment and a plurality of first connecting bridges. The arc segment surrounds a partial outer peripheral wall of the rotating shaft and is connected to the rotating shaft. Two ends of the plurality of first connecting bridges are respectively connected to the arc segment and the corresponding first sector portion.

2. The rotor core according to claim 1, wherein: Every two adjacent first sector portions form a pair of first sector groups. The first punching sheet includes N / 2 pairs of the first sector groups, and the pairs of the first sector groups are arranged at intervals. The two first sector portions of each pair of the first sector groups are both connected by the connecting portion.

3. The rotor core according to claim 1, wherein: Adjacent M1 first sector portions form a second sector group. The M1 first sector portions of the second sector group are connected by the connecting portion, where M1 is a natural number, and N>2, 2<M1<N.

4. The rotor core according to claim 1, wherein: Adjacent M2 first sector portions form a third sector group. Along the circumferential direction of the rotor core, the first sector portions located on both sides in the third sector group are connected by the connecting portion, where M2 is a natural number, and N>2, 3≤M2<N.

5. The rotor core according to any one of claims 1 to 4, characterized in that: Along the direction of the rotation axis, two adjacent first punching sheets rotate M3*360 / N degrees along the circumferential direction of the rotor core, where M3 is a natural number, and 1≤M3<N.

6. The rotor core according to claim 5, characterized in that: Along the direction of the rotation axis, among two adjacent first punching sheets, the subsequent first punching sheet rotates 360 / N degrees in the same rotation direction relative to the previous first punching sheet.

7. The rotor core according to any one of claims 1 to 4, characterized in that: The plurality of punching sheets further include a second punching sheet. The second punching sheet includes an inner core and a plurality of second sector portions arranged on the outer side of the inner core, and a plurality of second connecting bridges extending along the radial direction. The inner core is annular and is connected to the rotating shaft. The number of the second sector portions is equal to the number of the second connecting bridges. The second sector portions are respectively connected to the inner core by the corresponding second connecting bridges.

8. The rotor core according to claim 7, characterized in that: At least one of the second punching sheets is located at at least one end of the rotor core along the rotation axis. The first sector portions and the second sector portions are stacked along the direction of the rotation axis.

9. Rotor assembly, characterized in that, Comprising: The rotor core according to any one of claims 1 to 8, including a plurality of core units arranged around the rotation axis, and an installation groove is formed between adjacent core units; A plurality of permanent magnets are respectively installed in the corresponding installation grooves.

10. Electric motor, characterized in that: Comprising a stator assembly and the rotor assembly according to claim 9, and the stator assembly is arranged around the outer side of the rotor assembly.

11. Household appliance, characterized in that: Comprising the motor according to claim 10.

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