Rotor structure, electric machine and household appliance

Abstract

The utility model discloses a rotor structure, motor and household appliance, rotor structure includes: rotor core, rotor core includes along the multiple rotor units of arrangement of rotor core's circumferential direction, and rotor core includes along the multiple rotor lamination of stack setting of rotor core axial direction, and rotor lamination includes along the multiple subunits of arrangement of rotor lamination circumferential direction, and inner core, and rotor lamination includes first lamination, and the multiple subunits of first lamination all are connected with inner core, and rotor lamination still includes second lamination and / or third lamination, and the multiple subunits of second lamination all are disconnected with inner core, and the multiple subunits of third lamination are connected with inner core in part, and rotor core is about the central plane symmetry setting perpendicular to rotor core axis, and rotor core includes N groups rotor lamination, and the rotor lamination in adjacent two groups rotor lamination is different. The utility model can guarantee the strength of rotor structure, and can reduce rotor leakage magnetic, improve the power density of motor, reduce cost.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, and in particular to a rotor structure, a motor and a household appliance. Background Technology

[0002] Among related technologies, permanent magnet synchronous motors have high power density and torque density, and are widely used in the field of household appliances. The performance and quality of the motor are important factors determining the quality of the product. For traditional motors, the rotor core is connected to the inner core of the rotor via an internal magnetic bridge. This part has a large leakage flux, which prevents the motor's power density from being further increased. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a rotor structure with high strength and low magnetic leakage, which can improve the power density of the motor and reduce costs.

[0004] This utility model also proposes an electric motor, which includes the rotor structure described above.

[0005] This utility model also proposes a household appliance, which includes the aforementioned motor.

[0006] The rotor structure according to an embodiment of the present invention includes: a rotor core, wherein the rotor core includes a plurality of rotor units arranged along the circumferential direction of the rotor core, and a magnetic slot is defined between two adjacent rotor units; the rotor core includes a plurality of rotor laminations stacked along the axial direction of the rotor core; each rotor lamination includes a plurality of sub-units arranged along the circumferential direction of the rotor lamination; each rotor unit includes a plurality of sub-units stacked along the axial direction of the rotor core; and an inner core, wherein the inner core is disposed radially inside the rotor core; the rotor laminations include a first lamination. The first lamination has multiple sub-units connected to the inner core. The rotor lamination also includes a second lamination and / or a third lamination. The second lamination has multiple sub-units disconnected from the inner core. A portion of the multiple sub-units of the third lamination is connected to the inner core. The rotor core is symmetrically arranged about a central plane perpendicular to the rotor core axis. Along the axial direction of the rotor core, the rotor core includes N groups of rotor laminations, where N≥3. Each group of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent groups of rotor laminations are different.

[0007] According to the rotor structure of this utility model embodiment, the rotor core includes multiple rotor units arranged along the circumferential direction of the rotor core, and multiple rotor laminations stacked along the axial direction of the rotor core. Each rotor lamination includes multiple sub-units arranged along the circumferential direction of the rotor laminations. Each rotor unit includes multiple sub-units stacked along the axial direction of the rotor core. The inner core is located radially inside the rotor core. The rotor laminations include at least one of a second lamination and a third lamination, as well as a first lamination. Multiple sub-units of the first lamination are connected to the inner core, multiple sub-units of the second lamination are disconnected from the inner core, and a portion of the multiple sub-units of the third lamination are connected to the inner core. The rotor core is symmetrically arranged about a central plane perpendicular to the rotor core axis. Along the axial direction of the rotor core, the rotor core includes N groups of rotor laminations, where N≥3. Each group of rotor laminations includes one or more identical rotor laminations, and the rotor laminations in adjacent groups are different. This design ensures the strength of the rotor structure, reduces rotor leakage flux, increases the power density of the motor, and reduces costs.

[0008] According to some embodiments of the present invention, at least some of the radial inner ends of at least some of the sub-units of the rotor laminations are provided with an inner positioning magnetic bridge on at least one side of the two sides along the circumferential direction of the rotor core; and / or, at least some of the radial outer ends of at least some of the sub-units of the rotor laminations are provided with an outer positioning magnetic bridge on at least one side of the two sides along the circumferential direction of the rotor core.

[0009] In some embodiments of this utility model, each of the magnet slots is provided with at least one inner positioning magnetic bridge on the inner side along the radial direction of the rotor core; and / or, each of the magnet slots is provided with at least one outer positioning magnetic bridge on the outer side along the radial direction of the rotor core.

[0010] In some embodiments of this utility model, on the same rotor lamination, there are two adjacent sub-units with the inner positioning magnetic bridge on one side facing each other, and the two inner positioning magnetic bridges are spaced apart or connected as one; and / or, on the same rotor lamination, there are two adjacent sub-units with the outer positioning magnetic bridge on one side facing each other, and the two outer positioning magnetic bridges are spaced apart or connected as one.

[0011] According to some embodiments of the present invention, the rotor lamination includes the third lamination, and the number of sub-units connected to the inner core on the third lamination is an even number greater than or equal to 2, and the multiple sub-units connected to the inner core are symmetrically distributed.

[0012] According to some embodiments of the present invention, the rotor lamination includes the third lamination. In a group of rotor laminations including multiple third laminations, the two ends of the rotor core in the axial direction are the first end and the second end, respectively. In any two adjacent third laminations, the third lamination closer to the first end rotates 360° / 2p relative to the third lamination closer to the second end, where 2p is the number of rotor units.

[0013] According to some embodiments of the present invention, the number of sub-units connected to the inner iron core in each rotor unit is equal.

[0014] According to some embodiments of this utility model, the sub-unit connected to the inner iron core is connected to the inner iron core via an inner magnetic bridge.

[0015] In some embodiments of this utility model, the size of the inner magnetic bridge is greater than or equal to 0.5 mm along the circumferential direction of the rotor core.

[0016] The motor according to an embodiment of the present invention includes the rotor structure described above.

[0017] According to the embodiment of the present invention, the motor, by setting the above-described rotor structure, includes a rotor core comprising a plurality of rotor units arranged along the circumferential direction of the rotor core, a plurality of rotor laminations stacked along the axial direction of the rotor core, a rotor lamination comprising a plurality of sub-units arranged along the circumferential direction of the rotor lamination, a rotor unit comprising a plurality of sub-units stacked along the axial direction of the rotor core, and an inner core disposed radially inside the rotor core. The rotor laminations include at least one of a second lamination and a third lamination, and a first lamination, wherein the first lamination... Multiple sub-units of the first lamination are connected to the inner core, multiple sub-units of the second lamination are disconnected from the inner core, and some of the multiple sub-units of the third lamination are connected to the inner core, such that the rotor core is symmetrically arranged about the center plane perpendicular to the rotor core axis. Along the axial direction of the rotor core, the rotor core includes N groups of rotor laminations, N≥3. Each group of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent groups of rotor laminations are different, which can ensure the strength of the rotor structure, reduce rotor leakage flux, increase the power density of the motor, and reduce costs.

[0018] The household appliance according to an embodiment of the present invention includes the motor described above.

[0019] According to the embodiments of the present invention, a household appliance is provided with the aforementioned motor, which includes the aforementioned rotor structure. The rotor core includes multiple rotor units arranged along the circumferential direction of the rotor core. The rotor core includes multiple rotor laminations stacked along the axial direction of the rotor core. Each rotor lamination includes multiple sub-units arranged along the circumferential direction of the rotor lamination. Each rotor unit includes multiple sub-units stacked along the axial direction of the rotor core. An inner core is located radially inside the rotor core. By making the rotor laminations include at least one of a second lamination and a third lamination, as well as a first lamination, its... In the first lamination, multiple sub-units are connected to the inner core; multiple sub-units of the second lamination are disconnected from the inner core; and a portion of multiple sub-units of the third lamination are connected to the inner core. The rotor core is symmetrically arranged about a central plane perpendicular to the rotor core axis. Along the axial direction of the rotor core, the rotor core includes N groups of rotor laminations, where N≥3. Each group of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent groups of rotor laminations are different. This design ensures the strength of the rotor structure, reduces rotor leakage flux, increases the power density of the motor, and reduces costs.

[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a perspective view of the rotor structure according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the first lamination and inner core of the rotor core according to an embodiment of the present utility model. Figure 3 This is a schematic diagram of the first lamination and inner core of the rotor core according to another embodiment of the rotor structure of the present invention; Figure 4 This is a schematic diagram of the first lamination and inner core of the rotor core according to another embodiment of the present invention. Figure 5 This is a schematic diagram of the first lamination and inner core of the rotor core according to another embodiment of the rotor structure of the present invention; Figure 6 This is a schematic diagram of the second lamination and inner core of the rotor core according to an embodiment of the present utility model. Figure 7 This is a schematic diagram of the third lamination and inner core of the rotor core according to an embodiment of the present utility model. Figure 8This is a schematic diagram of the third lamination of the rotor core and the inner core from another angle according to an embodiment of the present utility model. Figure 9 This is a comparison diagram of the back electromotive force of the rotor structure of this utility model and the existing rotor structure; Figure 10 This is a comparison diagram of the safety factors of the rotor structure of this utility model and the existing rotor structure.

[0022] Figure label: 100. Rotor structure; 1. Rotor core; 11. Rotor unit; 12. Magnet slot; 13. First lamination; 14. Second lamination; 15. Third lamination; 16. Subunit; 161. Inner positioning magnetic bridge; 162. Outer positioning magnetic bridge; 2. Inner iron core; 21. Inner magnetic bridge; 22. Injection molding tank. Detailed Implementation

[0023] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0024] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The rotor structure 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, the rotor structure 100 according to an embodiment of the present invention includes a rotor core 1 and an inner core 2.

[0027] Specifically, the rotor core 1 includes multiple rotor units 11 arranged along the circumferential direction of the rotor core 1. A magnet slot 12 is defined between two adjacent rotor units 11. The rotor structure 100 also includes multiple magnets, each disposed within a magnet slot 12. The rotor core 1 includes multiple rotor laminations stacked along the axial direction of the rotor core 1. Each rotor lamination includes multiple sub-units 16 arranged along the circumferential direction of the rotor lamination. Each rotor unit 11 includes multiple sub-units 16 stacked along the axial direction of the rotor core 1. The inner core 2 is located radially inside the rotor core 1.

[0028] like Figures 2-5 As shown, the rotor laminations include a first lamination 13, and multiple sub-units 16 of the first lamination 13 are all connected to the inner core 2. The rotor laminations also include a second lamination 14 and / or a third lamination 15, where multiple sub-units 16 of the second lamination 14 are disconnected from the inner core 2, and a portion of the multiple sub-units 16 of the third lamination 15 are connected to the inner core 2.

[0029] It is understood that the rotor laminations may include a first lamination 13 and a second lamination 14, wherein multiple sub-units 16 of the first lamination 13 are connected to the inner iron core 2, and multiple sub-units 16 of the second lamination 14 are disconnected from the inner iron core 2; the rotor laminations may include a first lamination 13 and a third lamination 15, wherein multiple sub-units 16 of the first lamination 13 are connected to the inner iron core 2, and a portion of the multiple sub-units 16 of the third lamination 15 are connected to the inner iron core 2; the rotor laminations may include a first lamination 13, a second lamination 14 and a third lamination 15, wherein multiple sub-units 16 of the first lamination 13 are connected to the inner iron core 2, multiple sub-units 16 of the second lamination 14 are disconnected from the inner iron core 2, and a portion of the multiple sub-units 16 of the third lamination 15 are connected to the inner iron core 2.

[0030] The rotor core 1 is symmetrically arranged about the central plane perpendicular to the axis of the rotor core 1. Along the axial direction of the rotor core 1, the rotor core 1 includes N groups of rotor laminations, N≥3. Each group of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent groups of rotor laminations are different. The rotor laminations of different groups are alternately distributed and stamped into one piece.

[0031] In this application, some rotor laminations are first laminations 13, which ensures the strength of the rotor structure 100. Meanwhile, some rotor laminations are second laminations 14 and / or third laminations 15, which reduces rotor leakage flux, increases the power density of the motor, and reduces cost. Furthermore, the different laminations in adjacent sets of rotor laminations better ensure the structural strength of the rotor. Additionally, the rotor core 1 is symmetrically arranged about a central plane perpendicular to its axis, reducing magnetic field harmonics caused by rotor structural asymmetry and ensuring the reliability of the motor.

[0032] like Figure 1 As shown, a comparison diagram of the back electromotive force (EMF) of a fully connected magnetic bridge rotor structure (all rotor structures of the first lamination type), the rotor structure 100 of this application, and a fully disconnected magnetic bridge rotor (all rotor structures of the second lamination type) is presented. The back EMF of the rotor structure 100 of this application is significantly higher than that of the fully connected magnetic bridge rotor, and the difference between the back EMF and that of the fully disconnected magnetic bridge rotor structure is not significant.

[0033] like Figure 2 As shown, a safety factor comparison diagram is presented for a fully connected magnetic bridge rotor structure (all rotor structures of the first lamination type), the rotor structure 100 of this application, and a fully disconnected magnetic bridge rotor (all rotor structures of the second lamination type). The safety factor of the rotor structure 100 of this application is slightly lower than that of the fully connected magnetic bridge rotor, but significantly higher than that of the fully disconnected magnetic bridge rotor structure.

[0034] It is evident that the rotor structure 100 of this application takes into account both back EMF and safety factor, ensuring the strength of the rotor structure 100 while reducing rotor leakage flux, increasing the power density of the motor, and reducing costs.

[0035] According to the rotor structure 100 of this utility model embodiment, the rotor core 1 includes a plurality of rotor units 11 arranged along the circumferential direction of the rotor core 1, the rotor core 1 includes a plurality of rotor laminations stacked along the axial direction of the rotor core 1, the rotor laminations include a plurality of sub-units 16 arranged along the circumferential direction of the rotor laminations, the rotor unit 11 includes a plurality of sub-units 16 stacked along the axial direction of the rotor core 1, the inner core 2 is disposed radially inside the rotor core 1, and the rotor laminations include at least one of a second lamination 14 and a third lamination 15 and a first lamination 13, wherein the first lamination 13 has multiple Each subunit 16 is connected to the inner iron core 2. The multiple subunits 16 of the second lamination 14 are disconnected from the inner iron core 2. Some of the multiple subunits 16 of the third lamination 15 are connected to the inner iron core 2, and the rotor iron core 1 is symmetrically arranged about the central plane perpendicular to the axis of the rotor iron core 1. Along the axial direction of the rotor iron core 1, the rotor iron core 1 includes N sets of rotor laminations, N≥3. Each set of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent sets of rotor laminations are different, which can ensure the strength of the rotor structure 100, reduce rotor leakage flux, increase the power density of the motor, and reduce costs.

[0036] In some embodiments of this utility model, such as Figure 1 As shown, the rotor lamination includes 2p sub-units 16, where p is the number of rotor pole pairs. All sub-units 16 of the first lamination 13 are connected to the inner core 2 near the axis of the rotor core 1. All sub-units 16 of the second lamination 14 are spaced apart from the inner core 2 near the axis of the rotor core 1. Some sub-units 16 of the third lamination 15 are connected to the inner core 2 near the axis of the rotor core 1, while others are spaced apart from the inner core 2 near the axis of the rotor core 1.

[0037] In some embodiments of this utility model, at least one of the radially inner ends of at least a portion of the rotor laminations, specifically the subunits 16, is provided with an inner positioning magnetic bridge 161 on at least one side of both sides along the circumferential direction of the rotor core 1. The inner positioning magnetic bridge 161 can limit the magnet located in the magnet slot 12 in the radial direction along the rotor core 1, preventing the magnet from moving toward the axis of the rotor core 1.

[0038] exist Figures 2-5 In the example shown, the rotor lamination is the first lamination 13, and all the radially inner ends of the sub-units 16 of the first lamination 13 are provided with inner positioning magnetic bridges 161 on both sides along the circumferential direction of the rotor core 1. Figure 7 In the example shown, the rotor lamination is the third lamination 15. The radial inner end of the subunit 16 of the third lamination 15 connected to the inner core 2 is provided with an inner positioning magnetic bridge 161 on both sides along the circumferential direction of the rotor core 1.

[0039] In some embodiments of this utility model, at least one of the radially outer ends of at least a portion of the rotor laminations, specifically the subunits 16, is provided with an external positioning magnetic bridge 162 on at least one side of both sides along the circumferential direction of the rotor core 1. The external positioning magnetic bridge 162 can limit the magnet located in the magnet slot 12 in the radial direction along the rotor core 1, preventing the magnet from moving away from the axis of the rotor core 1.

[0040] exist Figures 2-5 In the example shown, the rotor lamination is the first lamination 13, and all the radially outer ends of the sub-units 16 of the first lamination 13 are provided with external positioning magnetic bridges 162 on both sides along the circumferential direction of the rotor core 1. Figure 6 In the example shown, the rotor lamination is the second lamination 14, and all the radially outer ends of the sub-units 16 of the second lamination 14 are provided with external positioning magnetic bridges 162 on both sides along the circumferential direction of the rotor core 1. Figure 7 In the example shown, the rotor lamination is the third lamination 15, and all the subunits 16 of the third lamination 15 are provided with external positioning magnetic bridges 162 on both sides of the radial outer end along the circumferential direction of the rotor core 1.

[0041] In some embodiments of this utility model, each magnet slot 12 is provided with at least one inner positioning magnetic bridge 161 on its inner side along the radial direction of the rotor core 1. The inner positioning magnetic bridge 161 can be provided on any rotor lamination stacked along the axial direction of the rotor core 1. When there are multiple inner positioning magnetic bridges 161, the inner positioning magnetic bridges 161 can be located on one side of the magnet slot 12 along the circumferential direction of the rotor core 1, or on both sides of the magnet slot 12 along the circumferential direction of the rotor core 1. This ensures that the magnet slot 12 has at least one inner positioning magnetic bridge 161 on its inner side along the radial direction of the rotor core 1, which can radially limit the magnets in the magnet slot 12 and prevent the magnets from moving towards the axis of the rotor core 1.

[0042] In some embodiments of this invention, each magnet slot 12 is provided with at least one external positioning magnetic bridge 162 on the outer side of the rotor core 1 along the radial direction. The external positioning magnetic bridge 162 can be disposed on any rotor lamination stacked along the axial direction of the rotor core 1. When there are multiple external positioning magnetic bridges 162, the external positioning magnetic bridges 162 can be located on one side of the magnet slot 12 along the circumferential direction of the rotor core 1, or on both sides of the magnet slot 12 along the circumferential direction of the rotor core 1. This ensures that the magnet slot 12 has at least one external positioning magnetic bridge 162 on the outer side of the rotor core 1 along the radial direction, which can radially limit the magnets in the magnet slot 12 and prevent the magnets from moving away from the axis of the rotor core 1.

[0043] In some embodiments of this utility model, on the same rotor lamination, two adjacent sub-units 16 have inner positioning magnetic bridges 161 on one side facing each other, and the two inner positioning magnetic bridges 161 are spaced apart or connected as one unit. For example, in Figure 2and Figure 4 In the example shown, the rotor lamination is the first lamination 13. Each sub-unit 16 is provided with an inner positioning magnetic bridge 161 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an inner positioning magnetic bridge 161 on the side facing each other, and the two inner positioning magnetic bridges 161 are spaced apart.

[0044] exist Figure 3 and Figure 5 In the example shown, the rotor lamination is the first lamination 13. Each sub-unit 16 is provided with an inner positioning magnetic bridge 161 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an inner positioning magnetic bridge 161 on the side facing each other, and the two inner positioning magnetic bridges 161 are connected as one unit.

[0045] In some embodiments of this utility model, on the same rotor lamination, two adjacent sub-units 16 have external positioning magnetic bridges 162 on one side facing each other, and the two external positioning magnetic bridges 162 are spaced apart or connected as one unit. For example, in Figure 2 and Figure 3 In the example shown, the rotor lamination is the first lamination 13. Each sub-unit 16 is provided with an external positioning magnetic bridge 162 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an external positioning magnetic bridge 162 on the side facing each other, and the two external positioning magnetic bridges 162 are spaced apart.

[0046] For example, in Figure 4 and Figure 5 In the example shown, the rotor lamination is the first lamination 13. Each sub-unit 16 is provided with an external positioning magnetic bridge 162 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an external positioning magnetic bridge 162 on the side facing each other, and the two external positioning magnetic bridges 162 are connected as one unit.

[0047] For example, in Figure 6 In the example shown, the rotor lamination is the second lamination 14. Each sub-unit 16 is provided with an external positioning magnetic bridge 162 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an external positioning magnetic bridge 162 on the side facing each other, and the two external positioning magnetic bridges 162 are spaced apart.

[0048] For example, in Figure 7 and Figure 8 In the example shown, the rotor lamination is the third lamination 15. Each sub-unit 16 is provided with an external positioning magnetic bridge 162 on both sides along the circumferential direction of the rotor core 1. Any two adjacent sub-units 16 are provided with an external positioning magnetic bridge 162 on the side facing each other, and the two external positioning magnetic bridges 162 are spaced apart.

[0049] In some embodiments of this utility model, such as Figure 7 and Figure 8As shown, the rotor laminations include a third lamination 15, and the number of sub-units 16 connected to the inner iron core 2 on the third lamination 15 is an even number greater than or equal to 2. These multiple sub-units 16 connected to the inner iron core 2 are symmetrically distributed. This avoids asymmetrical harmonics caused by an odd number of sub-units 16 connected to the inner iron core 2, thus improving the reliability of the motor.

[0050] In some embodiments of this invention, the number of sub-units 16 connected to the inner iron core 2 in each rotor unit 11 is equal. This avoids magnetic field harmonics caused by the asymmetrical structure.

[0051] In some embodiments of this utility model, the rotor laminations include third laminations 15. In a group of rotor laminations including multiple third laminations 15, the two ends of the rotor core 1 in the axial direction are the first end and the second end, respectively. In any two adjacent third laminations 15, the third lamination 15 closer to the first end rotates 360° / 2p relative to the third lamination 15 closer to the second end, where 2p is the number of rotor units 11. This ensures that the number of 2p rotor units 11 connected to the inner core 2 is equal, avoiding magnetic field harmonics caused by the asymmetrical structure.

[0052] For example, in Figure 7 and Figure 8 In the example shown, the number of sub-units 16 connected to the inner core 2 on the third lamination 15 is 2. The two sub-units 16 connected to the inner core 2 are placed at a 180° interval and are in the same group of rotor laminations. Figure 8 The third lamination 15 shown and Figure 7 The third lamination 15 shown is arranged adjacent to each other, and Figure 8 The third lamination 15 shown is relative to Figure 7 The third lamination 15 shown is rotated 360° / 2p. Different groups of rotor laminations are rotated and stacked in sequence according to the above angle to ensure that the number of 2p rotor units 11 connected to the inner iron core 2 is equal, so as to avoid magnetic field harmonics caused by the asymmetrical structure.

[0053] In some embodiments of this utility model, such as Figures 2-5 and Figure 8 As shown, the sub-unit 16 connected to the inner iron core 2 is connected to the inner iron core 2 via an inner magnetic bridge 21. This facilitates the connection between the rotor lamination sub-unit 16 and the inner iron core 2.

[0054] Furthermore, the rotor core 1 and the inner core 2 can be formed into a single piece by injection molding. An injection molded part is provided between the inner core 2 and the rotor core 1. Multiple injection grooves 22 are provided on the outer peripheral wall of the inner core 2. The multiple injection grooves 22 are spaced apart along the circumferential direction of the inner core 2 and penetrate the inner core 2 along the axial direction of the inner core 2. This can increase the connection area between the inner core 2 and the injection molded part and improve the reliability of the connection between the inner core 2 and the outer core.

[0055] Furthermore, multiple injection molding grooves 22 and multiple rotor units 11 are arranged opposite each other along the radial direction of the rotor core 1, and the inner magnetic bridge 21 is connected between the radial inner end face of the sub-unit 16 of the rotor lamination and the bottom wall of the injection molding groove 22.

[0056] In some embodiments of this invention, the size of the inner magnetic bridge 21 is greater than or equal to 0.5 mm along the circumferential direction of the rotor core 1. This ensures the structural strength of the inner magnetic bridge 21, thereby guaranteeing the reliability of the connection between the inner core and the outer core, and further ensuring the strength of the rotor structure 100.

[0057] For example, along the circumferential direction of the rotor core 1, the dimensions of the inner magnetic bridge 21 can be 0.5mm, 0.53mm, 0.55mm, 0.57mm, 0.59mm, 0.6mm, 0.65mm, 0.7mm, etc.

[0058] The following describes a motor according to an embodiment of the present invention.

[0059] The motor according to an embodiment of the present invention includes the rotor structure 100 described above.

[0060] The rotor structure 100 has magnets in the magnet slot 12. The motor also includes a stator assembly, which is sleeved outside the rotor structure 100. The rotor structure 100 is rotatably disposed inside the stator assembly.

[0061] According to the embodiment of the present invention, the motor, by setting the rotor structure 100 described above, includes a rotor core 1 comprising a plurality of rotor units 11 arranged along the circumferential direction of the rotor core 1, a plurality of rotor laminations stacked along the axial direction of the rotor core 1, a plurality of sub-units 16 arranged along the circumferential direction of the rotor laminations, a plurality of sub-units 16 stacked along the axial direction of the rotor core 1, and an inner core 2 disposed radially inside the rotor core 1. The rotor laminations include at least one of a second lamination 14 and a third lamination 15, and a first lamination 13. Multiple sub-units 16 of lamination 13 are connected to the inner iron core 2. Multiple sub-units 16 of the second lamination 14 are disconnected from the inner iron core 2. Parts of the multiple sub-units 16 of the third lamination 15 are connected to the inner iron core 2, and the rotor iron core 1 is symmetrically arranged about the central plane perpendicular to the axis of the rotor iron core 1. Along the axial direction of the rotor iron core 1, the rotor iron core 1 includes N groups of rotor laminations, N≥3. Each group of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent groups of rotor laminations are different. This can ensure the strength of the rotor structure 100, reduce rotor leakage flux, increase the power density of the motor, and reduce costs.

[0062] In some embodiments of this utility model, the motor can be a permanent magnet synchronous motor.

[0063] The following describes a household appliance according to an embodiment of the present invention.

[0064] According to the embodiments of the present invention, a household appliance is provided with the aforementioned motor, which includes the aforementioned rotor structure 100. The rotor core 1 includes a plurality of rotor units 11 arranged along the circumferential direction of the rotor core 1. The rotor core 1 includes a plurality of rotor laminations stacked along the axial direction of the rotor core 1. Each rotor lamination includes a plurality of sub-units 16 arranged along the circumferential direction of the rotor laminations. Each rotor unit 11 includes a plurality of sub-units 16 stacked along the axial direction of the rotor core 1. An inner core 2 is disposed radially inside the rotor core 1. The rotor laminations include at least one of a second lamination 14 and a third lamination 15, as well as a first lamination 13. In this configuration, multiple sub-units 16 of the first lamination 13 are connected to the inner core 2, multiple sub-units 16 of the second lamination 14 are disconnected from the inner core 2, and a portion of the multiple sub-units 16 of the third lamination 15 are connected to the inner core 2. This arrangement ensures that the rotor core 1 is symmetrically arranged about a central plane perpendicular to the axis of the rotor core 1. Along the axial direction of the rotor core 1, the rotor core 1 includes N sets of rotor laminations, where N ≥ 3. Each set of rotor laminations includes one or more identical rotor laminations. The rotor laminations in two adjacent sets of rotor laminations are different. This configuration ensures the strength of the rotor structure 100, reduces rotor leakage flux, increases the power density of the motor, and reduces costs.

[0065] In some embodiments of this utility model, the household appliance can be an air conditioner or a washing machine, etc.

[0066] Other components and operations of the motor and household appliances according to the embodiments of this utility model are known to those skilled in the art and will not be described in detail here.

[0067] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0068] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A rotor structure, characterized in that, include: A rotor core, comprising a plurality of rotor units arranged circumferentially along the rotor core, with magnetic slots defined between adjacent rotor units; the rotor core also comprises a plurality of rotor laminations stacked axially along the rotor core; each rotor lamination comprises a plurality of sub-units arranged circumferentially along the rotor lamination; and each rotor unit comprises a plurality of sub-units stacked axially along the rotor core. An inner iron core is located radially inside the rotor iron core. The rotor lamination includes a first lamination, wherein multiple sub-units of the first lamination are connected to the inner core. The rotor lamination also includes a second lamination and / or a third lamination, wherein multiple sub-units of the second lamination are disconnected from the inner core, and a portion of multiple sub-units of the third lamination are connected to the inner core. The rotor core is symmetrically arranged about a central plane perpendicular to the rotor core axis. Along the axial direction of the rotor core, the rotor core includes N groups of rotor laminations, where N≥3. Each group of rotor laminations includes one or more identical rotor laminations, and the rotor laminations in two adjacent groups of rotor laminations are different.

2. The rotor structure according to claim 1, characterized in that, At least one of the radially inner ends of at least a portion of the sub-units of the rotor laminations is provided with an inner positioning magnetic bridge on at least one side of both sides along the circumferential direction of the rotor core. And / or, at least one of the radially outer ends of at least a portion of the sub-units of the rotor laminations is provided with an external positioning magnetic bridge on at least one side of both sides along the circumferential direction of the rotor core.

3. The rotor structure according to claim 2, characterized in that, Each of the magnetic slots is provided with at least one inner positioning magnetic bridge on the inner side along the radial direction of the rotor core; And / or, each of the magnetic slots is provided with at least one of the external positioning magnetic bridges along the outer side of the rotor core in the radial direction.

4. The rotor structure according to claim 2, characterized in that, On the same rotor lamination, there are two adjacent sub-units with the inner positioning magnetic bridge on one side facing each other, and the two inner positioning magnetic bridges are spaced apart or connected as one unit; And / or, on the same rotor lamination, there are two adjacent sub-units with external positioning magnetic bridges on one side facing each other, and the two external positioning magnetic bridges are spaced apart or connected as one unit.

5. The rotor structure according to claim 1, characterized in that, The rotor lamination includes the third lamination, and the number of sub-units connected to the inner core on the third lamination is an even number greater than or equal to 2, and the multiple sub-units connected to the inner core are symmetrically distributed.

6. The rotor structure according to claim 1, characterized in that, The rotor lamination includes the third lamination. In a group of rotor laminations including multiple third laminations, the two ends of the rotor core in the axial direction are the first end and the second end, respectively. In any two adjacent third laminations, the third lamination closer to the first end rotates 360° / 2p relative to the third lamination closer to the second end, where 2p is the number of rotor units.

7. The rotor structure according to claim 1, characterized in that, The number of sub-units connected to the inner core in each rotor unit is equal.

8. The rotor structure according to claim 1, characterized in that, The sub-unit connected to the inner iron core is connected to the inner iron core via an inner magnetic bridge.

9. The rotor structure according to claim 8, characterized in that, Along the circumferential direction of the rotor core, the size of the inner magnetic bridge is greater than or equal to 0.5 mm.

10. An electric motor, characterized in that, Includes the rotor structure according to any one of claims 1-9.

11. A household appliance, characterized in that, Includes the motor according to claim 10.

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