Rotor assembly, motor and household appliance

Abstract

The utility model discloses a rotor assembly, a motor and a household electrical appliance, and relates to the technical field of motors. The rotor assembly comprises a rotor iron core and a permanent magnet, the rotor iron core comprises an outer iron core and an inner iron core, the inner iron core is located on the inner side of the outer iron core, the inner iron core and the outer iron core are arranged at an interval, and a mounting groove is formed between the inner iron core and the outer iron core. As the permanent magnets are formed in the mounting grooves through injection molding, the permanent magnets can be completely matched with the shapes of the mounting grooves, the mounting precision is high, and the assembly efficiency is high. And the permanent magnets are annular, and circumferential end parts do not exist, so that magnetic flux leakage can be reduced, and the utilization rate of magnetic flux is improved. As the mounting grooves are located between the inner iron core and the outer iron core, compared with a scheme that the permanent magnets are arranged on the inner wall of the rotor iron core, the permanent magnets are larger in size, the provided magnetic flux density is higher, and the working efficiency of the motor can be improved.

Description

Technical Field

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

[0002] The rotor of a permanent magnet motor includes a plurality of permanent magnets, which are arranged at intervals on the inner wall of the rotor core. The permanent magnets are used to provide magnetic flux, and the rotor core is used to conduct the magnetic circuit, so as to form a closed magnetic circuit in the air gap between the rotor and the stator. However, the scheme of arranging multiple permanent magnets at intervals has low assembly efficiency and poor positioning accuracy. In addition, the end leakage coefficient of two adjacent permanent magnets is large, and the total magnetic flux provided by the permanent magnets to the magnetic circuit is reduced, resulting in increased leakage. At the same time, when the permanent magnet is arranged on the inner side of the rotor core, the volume of the permanent magnet is limited, and the magnetic flux density provided is reduced, resulting in low working efficiency of the motor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a rotor assembly, in which the permanent magnet is injection molded and has a ring structure, which can improve assembly efficiency, high positioning accuracy, and small magnetic leakage, and can also increase the volume of the permanent magnet and improve the working efficiency of the motor.

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

[0005] According to the rotor assembly of the first aspect of the present invention, the rotor assembly rotates around the rotation axis and includes: a rotor core, including an outer core and an inner core, the outer core and the inner core are constructed to be arranged around the rotation axis, the inner core is arranged on the inner side of the outer core and is spaced apart from the outer core, and an installation groove is formed between the inner core and the outer core; an annular permanent magnet is injection molded in the installation groove.

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

[0007] The rotor core includes an outer core and an inner core, the inner core is located on the inner side of the outer core and is spaced apart from the outer core, and a mounting groove is formed between the inner core and the outer core. Since the permanent magnet is injection molded in the mounting groove, the permanent magnet can fully adapt to the shape of the mounting groove, with high installation accuracy and high assembly efficiency. The permanent magnet is annular and does not have circumferential ends, so it can reduce magnetic leakage and improve the utilization rate of magnetic flux. Since the mounting groove is located between the inner core and the outer core, compared with the solution in which the permanent magnet is arranged on the inner wall of the rotor core, the permanent magnet of this embodiment has a larger volume, provides a higher magnetic flux density, and can improve the working efficiency of the motor.

[0008] According to some embodiments of the utility model, the permanent magnet includes a plurality of first arc segments, which are arranged around the rotation axis, the outer sides of the first arc segments protrude in a direction away from the rotation axis, the inner sides of the first arc segments are recessed to form a first groove, and the inner core includes a plurality of first inner core units, which are correspondingly arranged in the first groove.

[0009] According to some embodiments of the present invention, the permanent magnet further includes a plurality of first connecting segments, the number of which is the same as that of the first arc segments, and the plurality of first arc segments and the plurality of first connecting segments are alternately connected in sequence.

[0010] According to some embodiments of the present invention, along the circumference of the rotor assembly, the longest distance of the outer side of the first arc segment is W 11 , the longest distance inside the first arc segment is W 12 , satisfying: 0.2≤W 12 / W 11 ≤0.8.

[0011] According to some embodiments of the present invention, the rotor core is annular, and along the radial direction of the rotor assembly, the maximum distance between the inner edge of the inner core and the inner edge of the first arc segment is h 11 , the maximum distance between the outer edge of the permanent magnet and the outer edge of the rotor core is h 12 , the minimum distance between the outer edge of the permanent magnet and the outer edge of the rotor core is h 13 , the minimum thickness of the permanent magnet is h 14 , satisfying: 0.13≤h 11 / (h 12 +h 14 )≤0.76;

[0012] Or, satisfy: 0.2≤h 12 / (h 12 +h 14 )≤0.85;

[0013] Or, satisfy: 0.05≤h 13 / (h 12 +h 14 )≤0.73;

[0014] Or, satisfy: 0.1≤h 14 / (h 12 +h 14 )≤0.71.

[0015] According to some embodiments of the present invention, the permanent magnet includes a plurality of first strip segments, and the plurality of first strip segments are sequentially connected along the circumference of the permanent magnet.

[0016] According to some embodiments of the present invention, along the radial direction of the rotor assembly, the minimum thickness of the first strip segment is h 21 , the minimum distance between the inner edge of the first strip segment and the inner edge of the rotor core is h 22 , the maximum distance between the outer edge of the first strip segment and the outer edge of the rotor core is h 23 , satisfying: 0.15≤h 21 / (h 21 +h 22 +h 23 )≤0.7;

[0017] Or, satisfy: 0.15≤h 22 / (h 21 +h 22 +h 23 )≤0.72;

[0018] Or, satisfy: 0.2≤h 23 / (h 21 +h 22 +h 23 )≤0.79.

[0019] According to some embodiments of the present invention, the length of the outer edge of the first strip segment is W 21 , along the radial direction of the rotor assembly, the minimum thickness of the first strip segment is h 21 , the minimum distance between the inner edge of the first strip segment and the inner edge of the rotor core is h 22 , the maximum distance between the outer edge of the first strip segment and the outer edge of the rotor core is h 23 , satisfying: 0.05≤W 21 / (h 21 +h 22 +h 23 )≤20.

[0020] According to some embodiments of the utility model, the permanent magnet includes a plurality of first bending segments and a plurality of circular arc segments, the first bending segment includes two second strip segments, one ends of the two second strip segments are connected and arranged at an angle, the angle between the inner edges of the two second strip segments is less than 180°, the other ends of the two second strip segments are connected to the circular arc segment, a second groove is formed on the inner side of the two second strip segments of the first bending segment, and the inner core includes a plurality of third inner core units, and the plurality of third inner core units are correspondingly arranged in the second groove.

[0021] According to some embodiments of the present invention, along the radial direction of the rotor assembly, the minimum thickness of the permanent magnet is h31 , the maximum distance between the inner edge of the first bending section and the inner edge of the rotor core is h 32 , the minimum distance between the outer edge of the first bending section and the outer edge of the rotor core is h 33 , satisfy: satisfy: 0.1≤h 31 / (h 31 +h 32 +h 33 )≤0.71;

[0022] Or, satisfy: 0.3≤h 32 / (h 31 +h 32 +h 33 )≤0.8;

[0023] Or, satisfy: 0.05≤h 33 / (h 31 +h 32 +h 33 )≤0.52.

[0024] According to some embodiments of the present invention, along the circumference of the rotor assembly, the maximum length of the inner edge of the arc segment is W 31 The end of the first bending section farthest from the rotation axis is a connecting end, and the distance between two adjacent connecting ends is W 32 , satisfying: 0.21≤W 31 / W 32 ≤0.7.

[0025] According to some embodiments of the utility model, the permanent magnet includes a plurality of second bending segments and a plurality of second connecting segments, the plurality of second bending segments and the plurality of second connecting segments are alternately connected in sequence, the second bending segment includes two third strip segments, one ends of the two third strip segments are connected and arranged at an angle, the angle between the outer edges of the two third strip segments is less than 180°, the other ends of the two third strip segments are connected to the second connecting segment, a third groove is formed between the two third strip segments of the second bending segment, and the outer core includes a plurality of fourth outer-inner core units, and the plurality of fourth outer-inner core units are correspondingly arranged in the third groove.

[0026] According to some embodiments of the present invention, the rotor core includes a plurality of core segments, and the plurality of core segments are sequentially connected along the circumference of the rotor core.

[0027] According to some embodiments of the present invention, the core segment includes an inner core unit and an outer core unit, the inner core unit is arranged at an interval inside the outer core unit, and both the inner core unit and the outer core unit are provided with positioning holes.

[0028] The motor according to the second embodiment of the utility model includes the rotor assembly described in the above embodiment.

[0029] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0030] By adopting the rotor assembly of the first aspect embodiment, the rotor assembly includes an outer core and an inner core by setting the rotor core, the inner core is located on the inner side of the outer core and is spaced apart from the outer core, and a mounting groove is formed between the inner core and the outer core. The permanent magnet is a magnetic material formed by mixing magnetic powder and a binder, and a liquid permanent magnet is injected into the mounting groove, and a solid permanent magnet is formed after solidification. Since the permanent magnet is injection molded in the mounting groove, the permanent magnet can fully adapt to the shape of the mounting groove, with high installation accuracy and high assembly efficiency. The permanent magnet is annular and does not have a circumferential end, so it can reduce leakage and improve the utilization rate of the magnetic flux. Since the mounting groove is located between the inner core and the outer core, compared with the solution in which the permanent magnet is arranged on the inner wall of the rotor core, the volume of the permanent magnet of this embodiment is larger, the magnetic flux density provided is higher, and the working efficiency of the motor can be improved.

[0031] A household appliance according to an embodiment of the third aspect of the utility model comprises the motor described in the above embodiment.

[0032] The household appliance according to the embodiment of the utility model has at least the following beneficial effects:

[0033] By adopting the motor of the second aspect embodiment, the rotor assembly of the motor includes an outer core and an inner core by setting the rotor core, the inner core is located on the inner side of the outer core and is spaced apart from the outer core, and a mounting groove is formed between the inner core and the outer core. The permanent magnet is a magnetic material formed by mixing magnetic powder and a binder, and a liquid permanent magnet is injected into the mounting groove, and a solid permanent magnet is formed after solidification. Since the permanent magnet is injection molded in the mounting groove, the permanent magnet can fully adapt to the shape of the mounting groove, with high installation accuracy and high assembly efficiency. The permanent magnet is annular and does not have a circumferential end, so it can reduce leakage and improve the utilization rate of the magnetic flux. Since the mounting groove is located between the inner core and the outer core, compared with the solution in which the permanent magnet is arranged on the inner wall of the rotor core, the volume of the permanent magnet of this embodiment is larger, the magnetic flux density provided is higher, and the working efficiency of the motor can be improved.

[0034] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0036] Figure 1 It is a structural schematic diagram of a rotor assembly of the first embodiment of the utility model;

[0037] Figure 2 It is a schematic structural diagram of the rotor core of the first embodiment of the utility model;

[0038] Figure 3 It is a structural schematic diagram of a permanent magnet of the first embodiment of the utility model;

[0039] Figure 4 It is a structural schematic diagram of the core segment of the first embodiment of the utility model;

[0040] Figure 5 It is a structural schematic diagram of a rotor assembly of a second embodiment of the utility model;

[0041] Figure 6 It is a structural schematic diagram of the core segment of the second embodiment of the utility model;

[0042] Figure 7 It is a structural schematic diagram of a rotor assembly of a third embodiment of the utility model;

[0043] Figure 8 It is a structural schematic diagram of a permanent magnet of a third embodiment of the utility model;

[0044] Fig. 9 It is a structural schematic diagram of the core segment of the third embodiment of the utility model;

[0045] Fig.10 It is a structural schematic diagram of a rotor assembly of a fourth embodiment of the utility model;

[0046] Fig.11 It is a structural schematic diagram of a permanent magnet of a fourth embodiment of the utility model;

[0047] Fig.12 This is a schematic diagram of the structure of a core segment punched out of a plate in one embodiment of the utility model;

[0048] Fig.13 It is a structural schematic diagram of punching sheets out of a plate in another embodiment of the utility model.

[0049] Reference numerals:

[0050] Rotor assembly 1000;

[0051] Rotor core 100; core segment 110; outer core 111; fourth outer core unit 1111; first outer core unit 1112; second outer core unit 1113; third outer core unit 1114; inner core 112; first inner core unit 1121; third inner core unit 1122; second inner core unit 1123; mounting groove 120; positioning hole 130;

[0052] Permanent magnet 200; first arc segment 210; first groove 211; first connecting segment 220; first strip segment 230; first bending segment 240; second strip segment 241; second groove 242; connecting end 243; arc segment 250; second bending segment 260; third strip segment 261; third groove 262; second connecting segment 270;

[0053] Plate 300; punching sheet 310. DETAILED DESCRIPTION

[0054] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0055] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0057] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0058] Reference Figure 1 and Figure 2As shown, a rotor assembly 1000 of an embodiment of the utility model can be used for a permanent magnet motor. The rotor assembly 1000 of the embodiment of the utility model includes a rotor core 100 and a permanent magnet 200. The rotor core 100 includes an outer core 111 and an inner core 112. The outer core 111 and the inner core 112 are both arranged around the rotation axis of the rotor assembly 1000. The inner core 112 is arranged on the inner side of the outer core 111 and is spaced from the outer core 111. A mounting groove 120 is formed between the inner core 112 and the outer core 111. It should be noted that the inner side of the outer core 111 refers to the side of the outer core 111 facing the rotation axis. The permanent magnet 200 is annular and is integrally injection molded in the mounting groove 120.

[0059] It can be understood that in order to increase the volume of the permanent magnet 200, by setting the installation groove 120 between the outer iron core 111 and the inner iron core 112, compared with the solution in which the permanent magnet 200 is directly connected to the rotor core 100, when the outer dimensions of the rotor assembly 1000 are the same, the solution of this embodiment can effectively increase the volume of the permanent magnet 200, and the permanent magnet 200 provides more magnetic flux density, which can improve the working efficiency of the motor.

[0060] The solution that the mounting groove 120 is located between the outer iron core 111 and the inner iron core 112 is adopted. The manufacturing precision and assembly precision required by the traditional installation method are high, resulting in increased costs. For this reason, the permanent magnet 200 adopts the injection molding method. The permanent magnet 200 is a magnetic material formed by mixing magnetic powder and a binder. The liquid permanent magnet 200 is injected into the mounting groove 120, and the solid permanent magnet 200 is formed after waiting for solidification. The rotor assembly 1000 can be plastic-coated to fix the relative position of the rotor core 100 and the permanent magnet 200. Since the permanent magnet 200 can fully adapt to the shape of the mounting groove 120, the installation precision is high and the assembly efficiency is high. The permanent magnet 200 is annular and does not have a circumferential end, so it can reduce leakage magnetic flux, improve the utilization rate of magnetic flux, and thus improve the performance of the motor.

[0061] The rotor core 100 is used to conduct the magnetic circuit so that the magnetic field of the permanent magnet 200 forms a closed loop. The inner core 112 and the outer core 111 are respectively arranged on the inner and outer sides of the permanent magnet 200, which can shorten the magnetic flux path, reduce magnetic resistance, reduce hysteresis loss, improve the uniformity of magnetic field distribution, and thus improve the working efficiency of the motor.

[0062] It should be noted that the inner side of the permanent magnet 200, the inner side of the inner core 112, the inner side of the outer core 111, etc. mentioned later all refer to the side close to the axis of rotation; the outer side of the permanent magnet 200, the outer side of the inner core 112, the outer side of the outer core 111, etc. all refer to the side away from the axis of rotation. Other expressions are similar and will not be repeated here.

[0063] Reference Figure 3 As shown, in the first embodiment of the present invention, the rotor assembly 1000 is an outer rotor structure, and the rotor assembly 1000 is annular as a whole. The permanent magnet 200 includes a plurality of first arc segments 210, and the plurality of first arc segments 210 are arranged around the rotation axis. The outer side of the first arc segment 210 protrudes in a direction away from the rotation axis, and the inner side of the first arc segment 210 is concave to form a first groove 211. Figure 2 As shown, the inner core 112 includes a plurality of first inner core units 1121, and the plurality of first inner core units 1121 are correspondingly arranged in the first groove 211. It can be understood that the outer side of the first arc segment 210 is convex and the inner side is concave, so that the surface area of ​​the outer side of the permanent magnet 200 is larger than the surface area of ​​the inner side, so as to form a gathering magnetic circuit, thereby increasing the magnetic flux area of ​​each pole, so as to improve the air gap magnetic density, so as to improve the working efficiency of the motor. The first inner core unit 1121 is arranged in the first groove 211 of the permanent magnet 200, and the first inner core unit 1121 is used to conduct the magnetic circuit, which helps to reduce the magnetic saturation of the rotor core 100, shorten the magnetic flux path, reduce leakage magnetic flux, and improve the working efficiency of the motor.

[0064] It should be noted that the converging magnetic circuit means that the area of ​​the magnetic flux emitted by the permanent magnet 200 is larger than the area directly close to the air gap, so that the air gap magnetic density increases and is higher than the residual magnetism of the magnet itself. The converging magnetic circuit can increase the air gap magnetic density, optimize the waveform of the back electromotive force, increase the torque of the motor under the same current state, and thus increase the torque density.

[0065] Reference Figure 3 As shown, in the first embodiment of the utility model, the permanent magnet 200 further includes a plurality of first connecting segments 220, the number of the first connecting segments 220 is the same as the number of the first arc segments 210, and the plurality of first arc segments 210 and the plurality of second arc segments are connected alternately in sequence. The inner side of the first connecting segment 220 is an arc surface, and the inner side of the first inner core unit 1121 is also an arc surface. The radius and center of the arc surface of the first connecting segment 220 and the arc surface of the first inner core unit 1121 are the same, for example Figure 1 As shown. Therefore, the distance between the rotor assembly 1000 and the stator assembly in the radial direction can be made substantially the same, so as to improve the uniformity of the air gap. Since the uneven air gap will cause the motor to generate greater vibration and noise during operation, the solution of this embodiment can reduce the vibration of the rotor assembly 1000 during operation, so as to improve the smoothness of the motor operation, reduce noise, optimize the magnetic field waveform, reduce the harmonic content, and thus improve the overall performance of the motor.

[0066] It should be noted that, in another embodiment, the permanent magnet 200 may also only include a plurality of first arc segments 210 , and the plurality of first arc segments 210 are connected to each other. A suitable solution is selected according to actual conditions.

[0067] Reference Figure 1 As shown, in the embodiment of the present invention, along the circumference of the rotor assembly 1000, the longest distance of the outer side of the first arc segment 210 is W 11 , the longest distance inside the first arc segment 210 is W 12 , satisfying: 0.2≤W 12 / W 11 ≤0.8, e.g. W 12 / W 11 The values ​​of W are 0.2, 0.3, 0.5, 0.6, 0.7, 0.8, etc. 12 / W 11 It reflects the relationship between the opening width of the first groove 211 and the overall length of the first arc segment 210. 12 / W 11 The ratio is less than 0.2, indicating that the overall length of the first arc segment 210 is longer, while the opening width of the first groove 211 is smaller. In order to accommodate the longer first arc segment 210, the radial dimension of the rotor core 100 needs to be increased, which in turn leads to an increase in the volume of the motor, which is not conducive to the miniaturization of the motor. The opening of the first groove 211 is relatively small, and the volume of the first inner core unit 1121 is also relatively small, which makes it difficult to play the role of conducting the magnetic circuit, and is not conducive to the production and manufacturing of the first inner core unit 1121. At the same time, it will also lead to an increase in the thickness of the two ends of the first arc segment 210, that is, the thickness of the first arc segment 210 is uneven, which affects the uniformity of the air gap magnetic field and may cause distortion of the air gap magnetic field. This distortion will affect the torque pulsation and back electromotive force waveform of the motor, thereby affecting the stability and reliability of the motor. When W 12 / W 11 When the ratio is greater than 0.8, the opening width of the first groove 211 is larger and the overall length of the first arc segment 210 is shorter, which will also cause the thickness of the first arc segment 210 to be uneven, affecting the uniformity of the air gap magnetic field.

[0068] Therefore, a reasonable design of W 12 / W 11 The ratio can be set, for example, in the range of 0.2 to 0.8, to ensure that the volume of the motor will not increase significantly, while also improving the thickness uniformity of the first arc segment 210 to reduce air gap magnetic field distortion and improve the stability and reliability of the motor operation.

[0069] Reference Figure 1 As shown, in the embodiment of the present invention, the rotor core 100 is annular, and along the radial direction of the rotor assembly 1000, the maximum distance between the inner edge of the inner core 112 and the inner edge of the first arc segment 210 is h 11 The maximum distance between the outer edge of the permanent magnet 200 and the outer edge of the rotor core 100 is h 12, the minimum distance between the outer edge of the permanent magnet 200 and the outer edge of the rotor core 100 is h 13 , the minimum thickness of the permanent magnet 200 is h 14 , satisfying: 0.13≤h 11 / (h 12 +h 14 )≤0.76;

[0070] Or, satisfy: 0.2≤h 12 / (h 12 +h 14 )≤0.85;

[0071] Or, satisfy: 0.05≤h 13 / (h 12 +h 14 )≤0.73;

[0072] Or, satisfy: 0.1≤h 14 / (h 12 +h 14 )≤0.71.

[0073] For example, h 11 / (h 12 +h 14 ) can be 0.13, 0.24, 0.33, 0.45, 0.55, 0.62, 0.76. 12 / (h 12 +h 14 ) can be 0.2, 0.35, 0.45, 0.63, 0.71, 0.8, 0.85. 13 / (h 12 +h 14 ) can be 0.05, 0.23, 0.37, 0.51, 0.62, or 0.73. 14 / (h 12 +h 14 ) can take values ​​of 0.1, 0.23, 0.36, 0.48, 0.62, and 0.71.

[0074] Understandably, h 12 +h 14 is the total thickness of the rotor assembly 1000 in the radial direction, h 11 / (h 12 +h 14 ) reflects the proportion of the maximum thickness of the inner core 112 to the total thickness of the rotor assembly 1000; when h 11 / (h 12 +h 14 ) is less than 0.13, the permanent magnet 200 has no magnetic field concentration effect and the magnetic flux density decreases.11 / (h 12 +h 14 ) is greater than 0.76, the area where the magnetic flux is emitted is small, the magnetic flux density is reduced, and the performance of the motor is reduced. Therefore, it is necessary to design h 11 / (h 12 +h 14 ) value can enhance the magnetic field concentration of the permanent magnet 200, thereby increasing the magnetic flux density and thus improving the performance of the motor.

[0075] h 12 / (h 12 +h 14 ) reflects the proportion of the maximum thickness of the outer core 111 to the total thickness of the rotor assembly 1000. 12 / (h 12 +h 14 ) is less than 0.2, the amount of permanent magnet 200 is large, and the cost performance is reduced; when h 12 / (h 12 +h 14 ) is greater than 0.85, the area where the magnetic flux is emitted is small and the performance of the motor is reduced. Therefore, it is necessary to design h 12 / (h 12 +h 14 ) can increase the area where the magnetic flux is emitted, reduce the amount of permanent magnet 200 used, and improve the performance of the motor.

[0076] h 13 / (h 12 +h 14 ) reflects the proportion of the minimum thickness of the outer core 111 to the total thickness of the rotor assembly 1000. 13 / (h 12 +h 14 ) is less than 0.05, the magnetic resistance is large and the performance of the motor is reduced; when h 13 / (h 12 +h 14 ) is greater than 0.73, the amount of permanent magnet 200 is too small, the magnetic flux is small, and the performance of the motor is reduced. Therefore, it is necessary to reasonably design h 13 / (h 12 +h 14 ) can reduce the magnetic resistance, increase the amount of permanent magnet 200, and thus increase the magnetic flux and improve the performance of the motor.

[0077] h 14 / (h 12 +h 14 ) reflects the proportion of the minimum thickness of the permanent magnet 200 to the total thickness of the rotor assembly 1000. 14 / (h 12 +h 14) is less than 0.1, the amount of permanent magnet 200 is small, resulting in reduced performance of the motor; when h 14 / (h 12 +h 14 ) is greater than 0.71, the amount of permanent magnet 200 is too large, and the cost performance is reduced. Therefore, a reasonable design of h 14 / (h 12 +h 14 ) is selected to ensure that the usage of the permanent magnet 200 is reasonable and the cost performance is improved.

[0078] Reference Figure 5 As shown, in the second embodiment of the utility model, the permanent magnet 200 includes a plurality of first strip segments 230, and the plurality of first strip segments 230 are sequentially connected along the circumference of the rotor assembly 1000, so that the cross section of the permanent magnet 200 is an annular polygon. By adopting the above scheme, the volume of the permanent magnet 200 can be effectively increased, the magnetic flux density provided by the permanent magnet 200 is increased, and the working efficiency of the motor is improved. In addition, the inner iron core 112 and the outer iron core 111 are both annular and located on the inner and outer sides of the permanent magnet 200. The inner iron core 112 and the outer iron core 111 play a role of magnetic conduction, which is conducive to the permanent magnet 200 to construct a closed loop, reduce magnetic resistance, and improve the uniformity of the magnetic field, so as to reduce the vibration of the motor during operation, thereby reducing the noise of the motor and improving the performance of the motor.

[0079] Reference Figure 5 As shown, in the second embodiment of the present invention, along the radial direction of the rotor assembly 1000, the minimum thickness of the first strip segment 230 is h 21 The minimum distance between the inner edge of the first strip segment 230 and the inner edge of the rotor core 100 is h 22 The maximum distance between the outer edge of the first strip segment 230 and the outer edge of the rotor core 100 is h 23 , satisfying: 0.15≤h 21 / (h 21 +h 22 +h 23 )≤0.7;

[0080] Or, satisfy: 0.15≤h 22 / (h 21 +h 22 +h 23 )≤0.72;

[0081] Or, satisfy: 0.2≤h 23 / (h 21 +h 22 +h 23 )≤0.79.

[0082] For example, h 21 / (h 21+h 22 +h 23 ) can be 0.15, 0.26, 0.38, 0.45, 0.55, 0.62, or 0.7. 22 / (h 21 +h 22 +h 23 ) can be 0.15, 0.36, 0.44, 0.69, or 0.72. 23 / (h 21 +h 22 +h 23 ) can take values ​​of 0.2, 0.23, 0.37, 0.51, 0.62, and 0.79.

[0083] Understandably, h 21 +h 22 +h 23 represents the total thickness of the rotor assembly 1000 in the radial direction, h 21 / (h 21 +h 22 +h 23 ) reflects the proportion of the minimum thickness of the permanent magnet 200 to the total thickness of the rotor assembly 1000. 21 / (h 21 +h 22 +h 23 ) is less than 0.15, the amount of permanent magnet 200 is small, resulting in reduced performance of the motor; when h 21 / (h 21 +h 22 +h 23 ) is greater than 0.7, the amount of permanent magnet 200 is too large, and the cost performance is reduced. Therefore, a reasonable design of h 21 / (h 21 +h 22 +h 23 ) is selected to ensure that the usage of the permanent magnet 200 is reasonable and the cost performance is improved.

[0084] h 22 / (h 21 +h 22 +h 23 ) represents the proportion of the minimum thickness of the inner core 112 to the total thickness of the rotor assembly 1000. 22 / (h 21 +h 22 +h 23 ) is less than 0.15, the manufacturing difficulty of the inner core 112 increases, which is not conducive to processing and manufacturing. 22 / (h 21 +h 22 +h 23) is greater than 0.72, the volume of the permanent magnet 200 is small and the performance of the motor is reduced. Therefore, a reasonable design of h 22 / (h 21 +h 22 +h 23 ) can reduce the manufacturing difficulty of the inner iron core 112 and improve the performance of the motor.

[0085] h 23 / (h 21 +h 22 +h 23 ) represents the ratio of the maximum thickness of the outer core 111 to the total thickness of the rotor assembly 1000. 23 / (h 21 +h 22 +h 23 ) is less than 0.2. Since the outer core 111 is mainly responsible for conducting the magnetic circuit, a reduction in the thickness of the outer core 111 will increase the magnetic resistance of the magnetic circuit, increase the loss, and reduce the performance of the motor. 23 / (h 21 +h 22 +h 23 ) is greater than 0.79, the volume of the permanent magnet 200 is too small, which will also lead to reduced performance of the motor. 23 / (h 21 +h 22 +h 23 ) can reduce the magnetic resistance of the magnetic circuit, and the volume of the permanent magnet 200 is appropriate, thereby improving the performance of the motor.

[0086] Reference Figure 5 As shown, in the second embodiment of the present invention, the length of the outer edge of the first strip segment 230 is W 21 , along the radial direction of the rotor assembly 1000, the minimum thickness of the first strip segment 230 is h 21 The minimum distance between the inner edge of the first strip segment 230 and the inner edge of the rotor core 100 is h 22 The maximum distance between the outer edge of the first strip segment 230 and the outer edge of the rotor core 100 is h 23 , satisfying: 0.05≤W 21 / (h 21 +h 22 +h 23 )≤20, for example, W 21 / (h 21 +h 22 +h 23 ) can be 0.05, 0.1, 0.5, 1, 2, 5, 10, 15, 20. 21 / (h 21 +h22 +h 23 ) is less than 0.05, the magnetic flux of each pole is small and the performance of the motor is too low; when W 21 / (h 21 +h 22 +h 23 ) is greater than 20, the magnetic flux of each pole is large, the magnetic flux density on the outer side of the rotor core 100 is too high, saturation is serious, and performance is excessive. Therefore, a reasonable design of W 21 / (h 21 +h 22 +h 23 ) can ensure that the magnetic flux of each pole has an appropriate size to improve the performance of the motor.

[0087] Reference Figure 7 and Figure 8 As shown, in the third embodiment of the utility model, the permanent magnet 200 includes a plurality of first bending segments 240 and a plurality of arc segments 250, and the number of the first bending segments 240 is the same as the number of the arc segments 250. The first bending segment 240 includes two second strip segments 241, one end of the two second strip segments 241 is connected and arranged at an angle, the angle of the inner edges of the two second strip segments 241 is less than 180°, and the other ends of the two second strip segments 241 are connected with arc segments 250, that is, the plurality of first bending segments 240 and the plurality of arc segments 250 are alternately connected in sequence and form a ring shape. The inner side of the two second strip segments 241 of the first bending segment 240 is formed with a second groove 242, and the inner core 112 includes a plurality of third inner core units 1122, the number of the third inner core units 1122 is the same as the number of the second grooves 242, and the plurality of third inner core units 1122 are correspondingly arranged in the second grooves 242.

[0088] By adopting the above solution, the surface area of ​​the outer side of the permanent magnet 200 is larger than the surface area of ​​the inner side, so as to form a concentrated magnetic circuit, thereby increasing the magnetic flux area of ​​each pole, so as to improve the air gap magnetic density, and improve the working efficiency of the motor. The third inner core unit 1122 is provided in the second groove 242 of the permanent magnet 200, and the third inner core unit 1122 is used to conduct the magnetic circuit, which helps to reduce the magnetic saturation of the rotor core 100, shorten the magnetic flux path, reduce leakage magnetic flux, and improve the working efficiency of the motor.

[0089] Among them, the radius and center of the inner side of the third inner core unit 1122 and the inner side of the arc segment 250 are the same. Therefore, the distance between the rotor assembly 1000 and the stator assembly in the radial direction can be made roughly the same to improve the uniformity of the air gap. Since the uneven air gap will cause the motor to generate greater vibration and noise during operation, the solution of this embodiment can reduce the vibration of the rotor assembly 1000 during operation to improve the stability of the motor operation, reduce noise, and optimize the magnetic field waveform, reduce the harmonic content, thereby improving the overall performance of the motor.

[0090] Reference Figure 7 As shown, in the third embodiment of the present invention, along the radial direction of the rotor assembly 1000, the minimum thickness of the permanent magnet 200 is h 31 The maximum distance between the inner edge of the first bending section 240 and the inner edge of the rotor core 100 is h 32 The minimum distance between the outer edge of the first bending section 240 and the outer edge of the rotor core 100 is h 33 , satisfy: satisfy: 0.1≤h 31 / (h 31 +h 32 +h 33 )≤0.71;

[0091] Or, satisfy: 0.3≤h 32 / (h 31 +h 32 +h 33 )≤0.8;

[0092] Or, satisfy: 0.05≤h 33 / (h 31 +h 32 +h 33 )≤0.52.

[0093] For example, h 31 / (h 31 +h 32 +h 33 ) can be 0.1, 0.27, 0.39, 0.46, 0.55, 0.62, or 0.8. 32 / (h 31 +h 32 +h 33 ) can be 0.3, 0.36, 0.44, 0.69, or 0.8. 33 / (h 31 +h 32 +h 33 ) can take values ​​of 0.05, 0.23, 0.37, 0.41, 0.51, and 0.52.

[0094] h31 +h 32 +h 33 h represents the total thickness of the rotor assembly 1000 in the radial direction. 31 / (h 31 +h 32 +h 33 ) reflects the proportion of the minimum thickness of the permanent magnet 200 to the total thickness of the rotor assembly 1000. 31 / (h 31 +h 32 +h 33 ) is less than 0.1, the amount of permanent magnet 200 is small, resulting in reduced performance of the motor; when h 31 / (h 31 +h 32 +h 33 ) is greater than 0.71, the amount of permanent magnet 200 is too large, and the cost performance is reduced. Therefore, a reasonable design of h 31 / (h 31 +h 32 +h 33 ) is selected to ensure that the usage of the permanent magnet 200 is reasonable and the cost performance is improved.

[0095] h 32 / (h 31 +h 32 +h 33 ) reflects the proportion of the maximum thickness of the inner core 112 to the total thickness of the rotor assembly 1000. 32 / (h 31 +h 32 +h 33 ) is less than 0.3, the magnetic flux emission area of ​​the permanent magnet 200 is reduced, and the performance of the motor is reduced. 32 / (h 31 +h 32 +h 33 ) is greater than 0.8, the outer side of the outer core 111 becomes thinner, the processing difficulty increases, and it is easy to deform, break and other adverse effects. In addition, the amount of permanent magnet 200 is too small, the magnetic flux is insufficient, and the performance of the motor is reduced. Therefore, a reasonable design of h 32 / (h 31 +h 32 +h 33 ) can increase the magnetic flux emission area of ​​the permanent magnet 200, reduce the processing difficulty of the outer iron core 111, and increase the amount of the permanent magnet 200 to improve the performance of the motor.

[0096] h 33 / (h 31 +h 32 +h 33) reflects the proportion of the minimum thickness of the outer core 111 to the total thickness of the rotor assembly 1000. 33 / (h 31 +h 32 +h 33 ) is less than 0.05, the outer side of the outer core 111 is too thin, the processing difficulty increases, and it is easy to deform, break, and other adverse effects. When the outer side of the outer core 111 becomes thinner, the processing difficulty increases, and it is easy to deform, break, and other adverse effects. If it is greater than 0.52, the magnetic flux emission area of ​​the permanent magnet 200 will be reduced, resulting in reduced performance of the motor. Therefore, a reasonable design of h 33 / (h 31 +h 32 +h 33 ) can increase the magnetic flux emission area of ​​the permanent magnet 200, reduce the processing difficulty of the outer iron core 111, and increase the amount of the permanent magnet 200 to improve the performance of the motor.

[0097] Reference Figure 7 As shown, in the third embodiment of the present invention, along the circumference of the rotor assembly 1000, the maximum length of the inner edge of the arc segment 250 is W 31 The end of the first bending section 240 farthest from the rotation axis is the connecting end 243, and the distance between two adjacent connecting ends 243 is W 32 , satisfying: 0.21≤W 31 / W 32 ≤0.7, e.g. W 31 / W 32 The values ​​of are 0.3, 0.45, 0.51, 0.62, 0.65, and 0.7. 31 / W 32 Less than 0.21, that is, W 31 The value of W is too small. 32 If the value of is too large, the flux emission area of ​​the permanent magnet 200 will be reduced, and the performance of the motor will be reduced. 31 / W 32 If W is greater than 0.7, the leakage flux between two adjacent connection segments will increase, and the performance of the motor will decrease. 31 / W 32 The value of can increase the magnetic flux emission area of ​​the permanent magnet 200, reduce magnetic leakage, and improve the performance of the motor.

[0098] Reference Fig.10 and Fig.11As shown, in the fourth embodiment of the utility model, the rotor assembly 1000 is an inner rotor structure. Among them, the permanent magnet 200 includes a plurality of second bending segments 260 and a plurality of second connecting segments 270, and the number of the second connecting segments 270 is the same as the number of the second bending segments 260. The plurality of second bending segments 260 and the plurality of second connecting segments 270 are alternately connected in sequence, the second bending segment 260 includes two third strip segments 261, one end of the two third strip segments 261 is connected and arranged at an angle, the angle of the outer edges of the two third strip segments 261 is less than 180°, the other ends of the two third strip segments 261 are connected to the second connecting segment 270, and a third groove 262 is formed between the two third strip segments 261 of the second bending segment 260, and the outer iron core 111 includes a plurality of fourth outer inner core units 1111, the number of the fourth outer inner core units 1111 is the same as the number of the third grooves 262, and the plurality of fourth outer inner core units 1111 are correspondingly arranged in the third grooves 262. By adopting the above solution, the one-piece molding of the permanent magnet 200 can reduce magnetic leakage, simplify the assembly process, improve processing efficiency, and reduce production costs.

[0099] In related technologies, such as Fig.13 As shown, in order to manufacture the annular rotor core 100, an annular punching sheet 310 is usually directly punched out on the plate 300, and multiple punching sheets 310 are stacked to form the rotor core 100. This production method has high precision and good consistency, but low material utilization and high production cost.

[0100] In order to solve the problem of low material utilization, refer to Figure 4 , Figure 6 and Fig. 9 As shown, in the embodiment of the present invention, the rotor core 100 includes a plurality of core segments 110, and the plurality of core segments 110 are sequentially connected along the circumference of the rotor assembly 1000 to form an annular structure. Fig.12 As shown, by adopting the above solution, more core segments 110 can be produced on the plate 300 of the same area, which can increase the utilization rate of materials and thus reduce costs. Since the permanent magnet 200 adopts the solution of injection molding, the precision requirement for the rotor core 100 is reduced, so the rotor core 100 can be manufactured in a segmented manner.

[0101] That is, the scheme of this embodiment is: in order to improve the material utilization rate, the rotor core 100 is produced by segmented manufacturing; but it will bring the problem of low manufacturing precision, which makes it difficult to install the permanent magnet 200. In order to solve the problem of insufficient precision, the injection molding magnet scheme is adopted. The rotor core 100 itself is equivalent to the mold of the injection molding permanent magnet 200, and does not need to be demolded, so the permanent magnet 200 can be perfectly set in the installation groove 120. However, compared with traditional magnets, the performance of injection molding magnets is reduced. In order to improve the performance, by setting the installation groove 120 between the outer core 111 and the inner core 112, the volume of the permanent magnet 200 is increased, and the performance of the motor is improved; and because the permanent magnet 200 is an injection molding magnet, the shape of the permanent magnet 200 can be designed to be more complex to optimize the magnetic circuit distribution and further improve the performance of the motor. The above scheme is adopted to reduce the production cost while making the motor using the rotor assembly 1000 of this embodiment have suitable performance.

[0102] In the embodiment of the present invention, the core segment 110 includes an inner core unit and an outer core unit, the inner core unit is arranged at intervals inside the outer core unit, and both the inner core unit and the outer core unit are provided with positioning holes 130, which can be positioned and matched with the positioning columns of related equipment to determine the relative position between the inner core unit and the outer core unit, and determine the position between adjacent core segments 110, so as to facilitate production and improve production efficiency. For example, referring to Figure 4 As shown, the inner core unit is the first inner core unit 1121, the outer core unit is the first outer core unit 1112, and the first inner core unit 1121 is arranged at intervals on the inner side of the first outer core unit 1112; or, referring to Figure 6 As shown, the inner core unit is the second inner core unit 1123, the outer core unit is the second outer core unit 1113, and the second inner core unit 1123 is arranged at intervals on the inner side of the second outer core unit 1113; or, referring to Fig. 9 As shown, the inner core unit is the third inner core unit 1122 , the outer core unit is the third outer core unit 1114 , and the third inner core unit 1122 is arranged at an interval on the inner side of the third outer core unit 1114 .

[0103] The motor of one embodiment of the utility model comprises the rotor assembly 1000 of the above embodiment. The motor of the utility model embodiment adopts the rotor assembly 1000 of the above embodiment, and the rotor core 100 comprises an outer core 111 and an inner core 112, the inner core 112 is located on the inner side of the outer core 111 and is spaced apart from the outer core 111, and a mounting groove 120 is formed between the inner core 112 and the outer core 111. Since the permanent magnet 200 adopts an integral injection molding scheme, the permanent magnet 200 is a magnetic material formed by mixing magnetic powder and a binder, and the liquid permanent magnet 200 is injected into the mounting groove 120, and the solid permanent magnet 200 is formed after solidification. Since the permanent magnet 200 can fully adapt to the shape of the mounting groove 120, the installation accuracy is high and the assembly efficiency is high. The permanent magnet 200 is annular and does not have a circumferential end, so it can reduce leakage magnetic flux and improve the utilization rate of magnetic flux. Since the mounting groove 120 is located between the inner core 112 and the outer core 111 , compared with the solution in which the permanent magnet 200 is arranged on the inner wall of the rotor core 100 , the permanent magnet 200 of this embodiment has a larger volume, provides a higher magnetic flux density, and can improve the working efficiency of the motor.

[0104] Since the motor 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 described in detail here.

[0105] A household appliance of an embodiment of the utility model includes the motor of the above embodiment, and the household appliance can be an air conditioner, a refrigerator, a washing machine, a humidifier, a vacuum cleaner, a dehumidifier and other electrical appliances. The household appliance of the utility model embodiment adopts the motor of the above embodiment, and the rotor assembly 1000 of the motor includes an outer iron core 111 and an inner iron core 112 by setting the rotor core 100, the inner iron core 112 is located on the inner side of the outer iron core 111 and is spaced from the outer iron core 111, and a mounting groove 120 is formed between the inner iron core 112 and the outer iron core 111. Since the permanent magnet 200 adopts an integral injection molding scheme, the permanent magnet 200 is a magnetic material formed by mixing magnetic powder and a binder, and the liquid permanent magnet 200 is injected into the mounting groove 120, and the solid permanent magnet 200 is formed after solidification. Since the permanent magnet 200 can fully adapt to the shape of the mounting groove 120, the installation accuracy is high and the assembly efficiency is high. The permanent magnet 200 is annular and has no circumferential end, so it can reduce magnetic leakage and improve the utilization rate of magnetic flux. Since the mounting groove 120 is located between the inner iron core 112 and the outer iron core 111, compared with the solution in which the permanent magnet 200 is arranged on the inner wall of the rotor iron core 100, the permanent magnet 200 of this embodiment has a larger volume, provides a higher magnetic flux density, and can improve the working efficiency of the motor.

[0106] Since the household appliance adopts all the technical solutions of the motor of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be described in detail here.

[0107] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rotor assembly, rotating about an axis of rotation, characterized in that: include: The rotor core comprises an outer core and an inner core, wherein the outer core and the inner core are configured to be arranged around the rotation axis, the inner core is arranged inside the outer core and is spaced apart from the outer core, and a mounting groove is formed between the inner core and the outer core; The annular permanent magnet is injection molded in the installation groove.

2. The rotor assembly according to claim 1, characterized in that: The permanent magnet includes a plurality of first arc segments, which are arranged around the rotation axis. The outer sides of the first arc segments protrude in a direction away from the rotation axis, and the inner sides of the first arc segments are recessed to form a first groove. The inner core includes a plurality of first inner core units, which are correspondingly arranged in the first groove.

3. The rotor assembly according to claim 2, characterized in that: The permanent magnet further includes a plurality of first connecting segments having the same number as the first arc segments, and the plurality of first arc segments and the plurality of first connecting segments are alternately connected in sequence.

4. The rotor assembly according to claim 2, characterized in that: Along the circumference of the rotor assembly, the longest distance of the outer side of the first arc segment is W 11 , the longest distance inside the first arc segment is W 12 , satisfying: 0.2≤W 12 / W 11 ≤0.

8.

5. The rotor assembly according to claim 3, characterized in that: The rotor core is annular, and along the radial direction of the rotor assembly, the maximum distance between the inner edge of the inner core and the inner edge of the first arc segment is h 11 , the maximum distance between the outer edge of the permanent magnet and the outer edge of the rotor core is h 12 , the minimum distance between the outer edge of the permanent magnet and the outer edge of the rotor core is h 13 , the minimum thickness of the permanent magnet is h 14 , satisfying: 0.13≤h 11 / (h 12 +h 14 )≤0.76; Or, satisfy: 0.2≤h 12 / (h 12 +h 14 )≤0.85; Or, satisfy: 0.05≤h 13 / (h 12 +h 14 )≤0.73; Or, satisfy: 0.1≤h 14 / (h 12 +h 14 )≤0.

71.

6. The rotor assembly according to claim 1, characterized in that: The permanent magnet includes a plurality of first strip segments, and the plurality of first strip segments are sequentially connected along the circumference of the permanent magnet.

7. The rotor assembly according to claim 6, characterized in that: Along the radial direction of the rotor assembly, the minimum thickness of the first strip segment is h 21 , the minimum distance between the inner edge of the first strip segment and the inner edge of the rotor core is h 22 , the maximum distance between the outer edge of the first strip segment and the outer edge of the rotor core is h 23 , satisfying: 0.15≤h 21 / (h 21 +h 22 +h 23 )≤0.7; Or, satisfying: 0.15≤h 22 / (h 21 +h 22 +h 23 )≤0.72; Or, satisfy: 0.2≤h 23 / (h 21 +h 22 +h 23 )≤0.

79.

8. The rotor assembly according to claim 6, characterized in that: The length of the outer edge of the first strip segment is W 21 , along the radial direction of the rotor assembly, the minimum thickness of the first strip segment is h 21 , the minimum distance between the inner edge of the first strip segment and the inner edge of the rotor core is h 22 , the maximum distance between the outer edge of the first strip segment and the outer edge of the rotor core is h 23 , satisfying: 0.05≤W 21 / (h 21 +h 22 +h 23 )≤20.

9. The rotor assembly according to claim 1, characterized in that: The permanent magnet includes a plurality of first bending segments and a plurality of circular arc segments, the first bending segment includes two second strip segments, one ends of the two second strip segments are connected and arranged at an angle, the angle between the inner edges of the two second strip segments is less than 180°, the other ends of the two second strip segments are connected to the circular arc segment, a second groove is formed on the inner side of the two second strip segments of the first bending segment, and the inner core includes a plurality of third inner core units, and the plurality of third inner core units are correspondingly arranged in the second groove.

10. The rotor assembly according to claim 9, characterized in that: Along the radial direction of the rotor assembly, the minimum thickness of the permanent magnet is h 31 , the maximum distance between the inner edge of the first bending section and the inner edge of the rotor core is h 32 , the minimum distance between the outer edge of the first bending section and the outer edge of the rotor core is h 33 , satisfy: satisfy: 0.1≤h 31 / (h 31 +h 32 +h 33 )≤0.71; Or, satisfy: 0.3≤h 32 / (h 31 +h 32 +h 33 )≤0.8; Or, satisfy: 0.05≤h 33 / (h 31 +h 32 +h 33 )≤0.

52.

11. The rotor assembly according to claim 9, characterized in that: Along the circumference of the rotor assembly, the maximum length of the inner edge of the arc segment is W 31 The end of the first bending section farthest from the rotation axis is a connecting end, and the distance between two adjacent connecting ends is W 32 , satisfying: 0.21≤W 31 / W 32 ≤0.

7.

12. The rotor assembly according to claim 1, characterized in that: The permanent magnet includes a plurality of second bending segments and a plurality of second connecting segments, wherein the plurality of second bending segments and the plurality of second connecting segments are alternately connected in sequence, the second bending segment includes two third strip segments, one ends of the two third strip segments are connected and arranged at an angle, the angle between the outer edges of the two third strip segments is less than 180°, the other ends of the two third strip segments are connected to the second connecting segment, a third groove is formed between the two third strip segments of the second bending segment, and the outer core includes a plurality of fourth outer-inner core units, and the plurality of fourth outer-inner core units are correspondingly arranged in the third groove.

13. The rotor assembly according to claim 1, characterized in that: The rotor core includes a plurality of core segments, and the plurality of core segments are sequentially connected along the circumferential direction of the rotor core.

14. The rotor assembly according to claim 13, characterized in that: The core segment comprises an inner core unit and an outer core unit. The inner core unit is arranged at an interval inside the outer core unit. Both the inner core unit and the outer core unit are provided with positioning holes.

15. The motor is characterized by: Comprising a rotor assembly as claimed in any one of claims 1 to 14.

16. A household appliance, characterized in that: Includes the motor as claimed in claim 15.

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