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 permanent magnet and a rotor iron core, the permanent magnet comprises a magnetic ring and a plurality of magnetic blocks, the plurality of magnetic blocks are arranged on the inner side of the magnetic ring at intervals, and a plurality of iron core blocks of the rotor iron core are correspondingly arranged in mounting grooves between two adjacent magnetic blocks. The iron core blocks play a role in magnetic conduction, magnetic induction lines of the magnetic blocks at the two ends of the iron core blocks and the magnetic rings on the outer sides can enter the air gaps through the iron core blocks, namely, the area of magnetic flux emitted by the permanent magnets is larger than the area of the sides, close to the air gaps, of the iron core blocks, so that the air gap flux density is increased, the torque density is improved, and the performance of the motor is improved.

Description

Technical Field

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

[0002] In the related art, the outer rotor of the permanent magnet includes a rotor core and a permanent magnet. The rotor core is annular, and multiple permanent magnets are provided and installed on the inner side of the rotor core. The denser the magnetic lines of force in the air gap, the higher the air gap magnetic density. However, it is difficult to improve the air gap magnetic density of the motor by adopting the above solution, resulting in a low torque density. 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 that can effectively increase the air gap magnetic flux density and torque density, thereby improving the performance of the motor.

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

[0005] The rotor assembly according to the first aspect of the present invention rotates around the rotation axis and comprises: a permanent magnet, comprising a magnetic ring and a plurality of magnetic blocks, wherein the plurality of magnetic blocks are arranged at intervals along the circumference of the rotor assembly on the inner wall of the magnetic ring, and a mounting groove is formed between two adjacent magnetic blocks and the inner wall of the magnetic ring;

[0006] The rotor core comprises a plurality of core blocks, the number of the core blocks is the same as the number of the mounting slots, and the plurality of core blocks are correspondingly arranged in the plurality of mounting slots.

[0007] The rotor assembly according to the embodiment of the utility model has at least the following beneficial effects:

[0008] The permanent magnet includes a magnetic ring and a plurality of magnetic blocks, the plurality of magnetic blocks are arranged at intervals on the inner side of the magnetic ring, and the plurality of core blocks of the rotor core are arranged in the mounting groove between two adjacent magnetic blocks. The core blocks play a role of magnetic conductivity, and the magnetic lines of force of the magnetic blocks at both ends of the core blocks and the magnetic ring on the outside can enter the air gap through the core blocks, that is, the area of ​​the magnetic flux emitted by the permanent magnet is larger than the area of ​​the core block close to the air gap, thereby increasing the air gap magnetic density, and then increasing the torque density, so as to improve the performance of the motor.

[0009] According to some embodiments of the present invention, the thickness of the magnetic block is uniform along a direction close to the rotation axis.

[0010] According to some embodiments of the present invention, the thickness of the magnetic block gradually decreases along a direction approaching the rotation axis.

[0011] According to some embodiments of the present invention, the inner side surface of the core block is a first arc surface, the inner side surface of the magnetic block is a second arc surface, and the radii of the first arc surface and the second arc surface are equal and their centers coincide.

[0012] According to some embodiments of the present invention, the permanent magnet includes a plurality of magnetic segments, and the plurality of magnetic segments are sequentially connected along the circumference of the rotor assembly.

[0013] According to some embodiments of the utility model, the magnetic segment includes a ring portion and two convex portions, the two convex portions are respectively connected to the two ends of the inner side of the ring portion, the convex portions at one end of two adjacent magnetic segments that are close to each other are connected, the two connected convex portions constitute the magnetic block, and a plurality of the ring portions are connected in sequence to form the magnetic ring.

[0014] According to some embodiments of the present invention, along the radial direction of the rotor assembly, the maximum depth of the mounting groove is h1, and the maximum thickness of the permanent magnet is h2, satisfying: 0.25≤h1 / h2≤0.82.

[0015] According to some embodiments of the present invention, along the circumference of the rotor assembly, the width of the installation slot at one end away from the rotation axis is W1, and the width of the installation slot at one end close to the rotation axis is W2, satisfying: 0.1≤W1 / W2≤10.

[0016] According to some embodiments of the present invention, the rotor assembly further includes a plastic package, and the magnetic ring and the magnetic block are connected via the plastic package.

[0017] According to some embodiments of the present invention, the magnetic block and the magnetic ring are configured as an integral structural component.

[0018] According to some embodiments of the present invention, the rotor core further includes a magnetic bridge, the magnetic bridge is located on the inner side of the permanent magnet, and at least two adjacent core blocks are connected by the magnetic bridge.

[0019] According to some embodiments of the present invention, at least one of the magnetic ring, the magnetic block or the core block is provided with a positioning structure, and the positioning structure is used to determine the relative position of the permanent magnet and the rotor core.

[0020] According to some embodiments of the utility model, the core block is provided with the positioning structure, and the positioning structure is a positioning hole, and the positioning hole is arranged through the core block.

[0021] The motor according to the second embodiment of the utility model includes the rotor assembly described in the above embodiment.

[0022] The motor according to the embodiment of the utility model has at least the following beneficial effects:

[0023] By adopting the rotor assembly of the first aspect embodiment, the rotor assembly includes a magnetic ring and a plurality of magnetic blocks by setting a permanent magnet, and the plurality of magnetic blocks are arranged at intervals on the inner side of the magnetic ring, and the plurality of core blocks of the rotor core are correspondingly arranged in the mounting groove between two adjacent magnetic blocks. The core blocks are divided into multiple parts, which can improve the material utilization rate during manufacturing, thereby reducing the production cost. The core blocks play a role of magnetic conductivity, and the magnetic lines of induction of the magnetic blocks at both ends of the core blocks and the magnetic ring on the outside can enter the air gap through the core blocks, that is, the area of ​​the permanent magnet emitting magnetic flux is larger than the area of ​​the core block close to the air gap, thereby increasing the air gap magnetic density, and then increasing the torque density, so as to improve the performance of the motor.

[0024] A household appliance according to an embodiment of the third aspect of the utility model comprises the motor described in the above embodiment.

[0025] The household appliance according to the embodiment of the utility model has at least the following beneficial effects:

[0026] By adopting the motor of the second aspect embodiment, the rotor assembly of the motor includes a magnetic ring and a plurality of magnetic blocks by setting a permanent magnet, and the plurality of magnetic blocks are arranged at intervals on the inner side of the magnetic ring, and the plurality of core blocks of the rotor core are correspondingly arranged in the mounting groove between two adjacent magnetic blocks. The core blocks are divided into multiple parts, which can improve the material utilization rate during manufacturing, thereby reducing the production cost. The core blocks play a role of magnetic conductivity, and the magnetic lines of induction of the magnetic blocks at both ends of the core blocks and the magnetic ring on the outside can enter the air gap through the core blocks, that is, the area of ​​the permanent magnet emitting magnetic flux is larger than the area of ​​the core block close to the air gap, thereby increasing the air gap magnetic density, and then increasing the torque density, so as to improve the performance of the motor.

[0027] 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

[0028] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0029] Figure 1 It is a structural schematic diagram of a rotor assembly of the first embodiment of the utility model;

[0030] Figure 2 It is a structural schematic diagram of a permanent magnet of the first embodiment of the utility model;

[0031] Figure 3 It is a structural schematic diagram of a permanent magnet of a second embodiment of the utility model;

[0032] Figure 4 It is a structural schematic diagram of a permanent magnet of a third embodiment of the utility model;

[0033] Figure 5 It is a structural schematic diagram of a permanent magnet of a fourth embodiment of the utility model;

[0034] Figure 6 It is a structural schematic diagram of a rotor assembly of another embodiment of the utility model;

[0035] Figure 7 This is a schematic diagram of the structure of a core block punched out of a plate in one embodiment of the utility model;

[0036] Figure 8 It is a structural schematic diagram of punching sheets out of a plate in another embodiment of the utility model.

[0037] Reference numerals:

[0038] Rotor assembly 1000; permanent magnet 100; magnetic ring 110; magnetic block 120; second arc surface 121; mounting groove 130; magnetic segment 140; ring portion 141; convex portion 142; rotor core 200; core block 210; first arc surface 211; magnetic bridge 220; positioning hole 230; plate 300; punching sheet 310. DETAILED DESCRIPTION

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] Reference Figure 1 and Figure 2 As 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 permanent magnet 100 and a rotor core 200. The permanent magnet 100 includes a magnetic ring 110 and a plurality of magnetic blocks 120. The magnetic ring 110 is annular. The plurality of magnetic blocks 120 are arranged on the inner wall of the magnetic ring 110 at intervals along the circumferential direction of the rotor assembly 1000. An installation groove 130 is formed between two adjacent magnetic blocks 120 and the inner wall of the magnetic ring 110. The rotor core 200 includes a plurality of core blocks 210. The number of the core blocks 210 is the same as the number of the installation grooves 130. The plurality of core blocks 210 are correspondingly arranged in the installation grooves 130.

[0044] It should be noted that Figure 1 and Figure 3 The bold arrow in the figure indicates the magnetization direction of the permanent magnet 100. The magnetization direction of the magnetic ring 110 is along the radial direction of the rotor assembly 1000, and the magnetization direction of the magnetic block 120 is along the circumferential direction of the rotor assembly 1000. The core block 210 plays a role of magnetic conductivity, and the magnetic flux lines of the permanent magnet 100 can form a closed loop under the conduction of the core block 210. The magnetic flux lines of the magnetic blocks 120 at both ends of the core block 210 and the outer magnetic ring 110 can enter the air gap through the core block 210, that is, the area of ​​the magnetic flux emitted by the permanent magnet 100 is larger than the area of ​​the core block 210 close to the air gap, so that the rotor assembly 1000 forms a concentrated magnetic circuit, thereby increasing the air gap magnetic density, and then increasing the torque density, so as to improve the performance of the motor.

[0045] In the related art, the rotor core is usually annular and integrally stamped. Figure 8 As shown, an annular punching sheet 310 is punched out on the plate 300, and a plurality of punching sheets 310 can be stacked to form an annular rotor core. When the above solution is adopted, the utilization rate of the plate 300 is low, resulting in increased production costs. For this reason, in the solution of the embodiment of the utility model, the rotor core 200 is manufactured by a block manufacturing solution, that is, the rotor core 200 is manufactured by dividing it into a plurality of core blocks 210. For example, referring to Figure 7 As shown, by punching out a plurality of core blocks 210 on the plate 300 , the utilization rate of the plate 300 can be effectively improved, thereby reducing the production cost.

[0046] Since the permanent magnet 100 and the rotor core 200 are manufactured and assembled separately, due to the error relationship, the core block 210 may be difficult to accurately install in the installation groove 130, and improving the manufacturing accuracy will lead to an increase in production costs. For this reason, in the embodiment of the utility model, the permanent magnet 100 can adopt the solution of injection molding magnet, that is, the permanent magnet 100 is a magnetic material formed by mixing magnetic powder and a binder. After fixing a plurality of core blocks 210 in a mold, the liquid permanent magnet 100 is injected into the mold, and the permanent magnet 100 is waited for to solidify. Therefore, the shape of the core block 210 and the permanent magnet 100 can be perfectly adapted, and the assembly accuracy is high. And the magnetic ring 110 and the magnetic block 120 are set as an integral structural part, which can improve the manufacturing efficiency of the rotor assembly 1000 and further reduce the production cost. And the core blocks 210 are arranged at intervals and there is no magnetic conductive member connected, which can effectively reduce magnetic leakage and improve the performance of the motor.

[0047] Reference Figure 2 As shown, in the first embodiment of the utility model, the thickness of the magnetic block 120 is uniform along the direction close to the rotation axis of the rotor assembly 1000. It should be noted that the thickness of the magnetic block 120 refers to the thickness of the magnetic block 120 along the circumferential direction of the rotor assembly 1000. Since the thickness of the magnetic block 120 remains unchanged, the width of the mounting groove 130 gradually decreases along the direction close to the rotation axis, and the width of the mounting groove 130 refers to the width of the mounting groove 130 along the circumferential direction of the rotor assembly 1000. When the core block 210 is set in the mounting groove 130, it can limit the core block 210 from radially detaching from the mounting groove 130, so the mounting groove 130 has a certain limiting effect, which is convenient for the subsequent PBT or BMC material to be used to plastic-coat the rotor core 200 and the permanent magnet 100 to fix the relative position between the permanent magnet 100 and the rotor core 200, avoid the rotor core 200 from loosening and falling off, and improve the stability and reliability of the connection.

[0048] It should be noted that BMC is an unsaturated polyester thermosetting plastic reinforced by glass fiber, which is widely used in fields such as motor plastic sealing. BMC material has high strength, high heat resistance, low shrinkage and good electrical insulation performance. It also has good tensile, impact and bending strength to ensure the mechanical properties of the motor. BMC material has high resistivity and breakdown voltage to ensure the electrical insulation performance of the motor; it also has good thermal conductivity to ensure the heat dissipation effect of the motor; it also has small shrinkage and water absorption, which can ensure the reliability and stability of the motor.

[0049] PBT is a thermosetting engineering plastic. PBT can be processed through various processing techniques such as injection molding and extrusion molding, and is suitable for the preparation of complex shapes. PBT has good temperature resistance within a certain temperature range and is suitable for medium and low temperature scenes. It also has high strength and toughness and can withstand certain impact and tensile forces. Therefore, PBT materials can also be used for motor plastic sealing.

[0050] Reference Figure 3 As shown, in the second embodiment of the utility model, the thickness of the magnetic block 120 gradually decreases along the direction close to the rotation axis of the rotor assembly 1000. It should be noted that the thickness of the magnetic block 120 refers to the thickness of the magnetic block 120 along the circumferential direction of the rotor assembly 1000. Therefore, the two side surfaces of the mounting groove 130 along the circumferential direction are inclined surfaces, which can further increase the magnetic flux emission area of ​​the permanent magnet 100, further increase the air gap magnetic density, and then increase the torque density, so as to improve the performance of the motor. At the same time, the volume of the magnetic block 120 can also be larger to increase the strength of the magnetic field, thereby increasing the output power and torque of the motor.

[0051] Reference Figure 1 As shown, in the embodiment of the utility model, the inner side surface of the core block 210 is the first arc surface 211, and the inner side surface of the magnetic block 120 is the second arc surface 121. The radii of the first arc surface 211 and the second arc surface 121 are equal and the centers of the circles coincide. It should be noted that the inner side surface of the core block 210 refers to the side surface of the core block 210 close to the axis of rotation, and the inner side surface of the magnetic block 120 refers to the side surface of the magnetic block 120 close to the axis of rotation. Therefore, the radial distance between the rotor assembly 1000 and the stator assembly 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.

[0052] Reference Figure 4 As shown, in the third embodiment of the utility model, the permanent magnet 100 includes a plurality of magnetic segments 140, and the plurality of magnetic segments 140 are sequentially connected along the circumference of the rotor assembly 1000 to form an annular structure. The magnetic segment 140 includes a ring portion 141 and two protrusions 142, and the two protrusions 142 are respectively connected to the two ends of the inner side of the ring portion 141, and a mounting groove 130 is formed between the two protrusions 142 and the ring portion 141. The protrusions 142 at one end of two adjacent magnetic segments 140 that are close to each other are connected, and the two connected protrusions 142 constitute a magnetic block 120, and the plurality of ring portions 141 are sequentially connected along the circumference of the rotor assembly 1000 to form a magnetic ring 110.

[0053] It is understandable that the permanent magnet 100 is divided into a plurality of magnetic segments 140, and each magnetic segment 140 is integrally injection molded with an iron core block 210. Compared with the solution of directly injecting the permanent magnet 100 into a ring shape, when the permanent magnet 100 is divided into a plurality of magnetic segments 140 for injection molding, the occupied space can be reduced, thereby improving the production efficiency. Subsequently, the plurality of magnetic segments 140 are connected and fixed by means of plastic coating, so that the production and processing of the permanent magnet 100 is more convenient, and the manufacturing efficiency is improved.

[0054] Reference Figure 5 As shown, in the fourth embodiment of the utility model, the magnetic ring 110 and the magnetic block 120 are manufactured separately and then connected and fixed by plastic coating. For example, the rotor assembly 1000 also includes a plastic coating, and the magnetic ring 110 and the plurality of magnetic blocks 120 are connected by the plastic coating. Therefore, the number of magnetic blocks 120 can be selected according to different situations to change the number of magnetic poles of the rotor assembly 1000 to meet the use requirements in different situations.

[0055] Reference Figure 6 As shown, in the embodiment of the present invention, the rotor core 200 further includes a magnetic bridge 220, which is located inside the permanent magnet 100, and at least two adjacent core blocks 210 are connected by the magnetic bridge 220. For example, the magnetic bridge 220 is annular and connected to all the core blocks 210. By providing the magnetic bridge 220, the core blocks 210 can be effectively prevented from being separated from the mounting groove 130, so as to improve the stability and reliability of the installation of the core blocks 210.

[0056] Reference Figure 2 As shown, in the embodiment of the utility model, along the radial direction of the rotor assembly 1000, the maximum depth of the mounting groove 130 is h1, and the maximum thickness of the permanent magnet 100 is h2, which satisfies: 0.25≤h1 / h2≤0.82, for example, the value of h1 / h2 can be 0.25, 0.31, 0.42, 0.49, 0.55, 0.61, 0.75, 0.82. h1 / h2 reflects the relationship between the maximum depth of the mounting groove 130 and the maximum thickness of the permanent magnet 100. When h1 / h2 is less than 0.25, that is, the depth of the mounting groove 130 is too shallow, the volume of the core block 210 is small, resulting in the magnetic flux area provided by the magnetic block 120 being too small, and the magnetic flux area is mainly provided by the magnetic ring 110. However, since the magnetic ring 110 is radially magnetized and there is no rotor core 200 outside the magnetic ring 110, the magnetic resistance is large, and the magnetic ring 110 cannot generate a high magnetic flux, resulting in reduced performance of the motor. When h1 / h2 is greater than 0.82, the thickness of the magnetic ring 110 is too thin, resulting in a reduction in the magnetic flux that the magnetic ring 110 can provide, resulting in a reduction in the working efficiency of the motor. Therefore, by reasonably designing the ratio of h1 / h2, for example, limiting it within the range of 0.25 to 0.82, the air gap flux density of the motor can be increased, thereby increasing the torque density and improving the performance of the motor.

[0057] Continue to refer to Figure 2 As shown, in the embodiment of the utility model, along the circumference of the rotor assembly 1000, the width of the end of the mounting groove 130 away from the rotation axis is W1, and the width of the end of the mounting groove 130 close to the rotation axis is W2, which satisfies: 0.1≤W1 / W2≤10, for example, the value of W1 / W2 can be 0.1, 0.5, 1, 2, 4, 6, 7, 8, 9, 10. It should be noted that the width of the mounting groove 130 refers to the width of the mounting groove 130 along the circumference of the rotor assembly 1000. When W1 / W2 is less than 0.1, the width W2 of the end of the mounting groove 130 close to the rotation axis is larger, and the width W1 of the end of the mounting groove 130 away from the rotation axis is smaller, so that the magnetic block 120 can provide more magnetic flux area, but the magnetic flux area provided by the magnetic ring 110 is reduced, the magnetic concentration effect is not obvious, and it is difficult to improve the air gap magnetic density of the motor. When W1 / W2 is greater than 10, the width W2 of the end of the mounting groove 130 close to the rotation axis is smaller, and the width W1 of the end of the mounting groove 130 away from the rotation axis is larger, resulting in a reduction in the area of ​​the core block 210 close to the motor air gap, which is likely to cause magnetic circuit blockage, that is, the magnetic flux generated by the magnetic ring 110 and the magnetic block 120 cannot completely pass through the core block 210 into the air gap, and it is also difficult to improve the air gap magnetic density, which leads to reduced motor performance. Therefore, a reasonable design of the size of W1 / W2 can improve the magnetic concentration effect of the rotor assembly 1000, thereby improving the air gap magnetic density and improving the performance of the motor.

[0058] In an embodiment of the utility model, at least one of the magnetic ring 110, the magnetic block 120 or the core block 210 is provided with a positioning structure, and the positioning structure is used to determine the relative position between the permanent magnet 100 and the rotor core 200. For example, the positioning structure can be a structure such as a hole, a groove, a protrusion, etc., and the positioning structure and the positioning column or positioning protrusion of the overmolding equipment are positioned and matched. For example, only the magnetic ring 110 is provided with a positioning structure, and the positioning structure is used to determine the relative position of the magnetic ring 110 in the overmolding equipment. When the permanent magnet 100 and the core block 210 are connected by an integrated molding solution, after determining the position of the magnetic ring 110, the position of the core block 210 is also determined, which is convenient for subsequent overmolding processing. Alternatively, only the magnetic block 120 is provided with a positioning structure, which can also determine the relative position of the permanent magnet 100 and the core block 210 in the overmolding equipment. Alternatively, referring to Figure 1 As shown, the core block 210 is provided with a positioning structure, which is a positioning hole 230, and the positioning hole 230 is set through the core block 210. The positioning hole 230 and the positioning column of the relevant injection molding equipment are positioned and matched, so as to determine the relative position between the plurality of core blocks 210 and the permanent magnet 100, which is convenient for the subsequent injection molding of the permanent magnet 100.

[0059] 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 assembly 1000 comprises a magnetic ring 110 and a plurality of magnetic blocks 120 by setting a permanent magnet 100, wherein the plurality of magnetic blocks 120 are arranged at intervals on the inner side of the magnetic ring 110, and the plurality of core blocks 210 of the rotor core 200 are correspondingly arranged in the mounting groove 130 between two adjacent magnetic blocks 120. The core blocks 210 play a role of magnetic conduction, and the magnetic flux lines of the magnetic blocks 120 at both ends of the core blocks 210 and the outer magnetic ring 110 can enter the air gap through the core blocks 210, that is, the area of ​​the magnetic flux emitted by the permanent magnet 100 is larger than the area of ​​the core block 210 close to the air gap, thereby increasing the air gap magnetic density, and then improving the torque density, so as to improve the performance of the motor.

[0060] 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.

[0061] A household appliance of an embodiment of the utility model comprises the motor of the above embodiment, and the household appliance may be an air conditioner, a refrigerator, a washing machine, a humidifier, a vacuum cleaner, a dehumidifier and the like. The household appliance of the utility model embodiment adopts the motor of the above embodiment, and the rotor assembly 1000 of the motor comprises a magnetic ring 110 and a plurality of magnetic blocks 120 by setting a permanent magnet 100, wherein the plurality of magnetic blocks 120 are arranged at intervals on the inner side of the magnetic ring 110, and the plurality of core blocks 210 of the rotor core 200 are correspondingly arranged in the mounting groove 130 between two adjacent magnetic blocks 120. The core blocks 210 play a role of magnetic conduction, and the magnetic flux lines of the magnetic blocks 120 at both ends of the core blocks 210 and the outer magnetic ring 110 can enter the air gap through the core blocks 210, that is, the area of ​​the magnetic flux emitted by the permanent magnet 100 is larger than the area of ​​the core blocks 210 close to the air gap, thereby increasing the air gap magnetic density, and then increasing the torque density, so as to improve the performance of the motor.

[0062] 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.

[0063] 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 permanent magnet comprises a magnetic ring and a plurality of magnetic blocks, wherein the plurality of magnetic blocks are arranged at intervals on the inner wall of the magnetic ring along the circumferential direction of the rotor assembly, and a mounting groove is formed between two adjacent magnetic blocks and the inner wall of the magnetic ring; The rotor core comprises a plurality of core blocks, the number of the core blocks is the same as the number of the mounting slots, and the plurality of core blocks are correspondingly arranged in the plurality of mounting slots.

2. The rotor assembly according to claim 1, characterized in that: The thickness of the magnetic block is uniform along a direction close to the rotation axis.

3. The rotor assembly according to claim 1, characterized in that: The thickness of the magnetic block gradually decreases along a direction approaching the rotation axis.

4. The rotor assembly according to claim 1, characterized in that: The inner side surface of the core block is a first arc surface, and the inner side surface of the magnetic block is a second arc surface. The radii of the first arc surface and the second arc surface are equal and their centers coincide.

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

6. The rotor assembly according to claim 5, characterized in that: The magnetic segment includes a ring portion and two convex portions, the two convex portions are respectively connected to the two ends of the inner side of the ring portion, the convex portions at one end of two adjacent magnetic segments are connected, the two connected convex portions constitute the magnetic block, and multiple ring portions are connected in sequence to form the magnetic ring.

7. The rotor assembly according to claim 1, characterized in that: Along the radial direction of the rotor assembly, the maximum depth of the mounting groove is h1, and the maximum thickness of the permanent magnet is h2, satisfying: 0.25≤h1 / h2≤0.

82.

8. The rotor assembly according to claim 1, characterized in that: Along the circumference of the rotor assembly, the width of the installation groove at one end away from the rotation axis is W1, and the width of the installation groove at one end close to the rotation axis is W2, satisfying: 0.1≤W1 / W2≤10.

9. The rotor assembly according to claim 1, characterized in that: The rotor assembly further comprises a plastic package, and the magnetic ring and the magnetic block are connected via the plastic package.

10. The rotor assembly according to claim 1, characterized in that: The magnetic block and the magnetic ring are configured as an integral structural component.

11. The rotor assembly according to claim 1, characterized in that: The rotor core further comprises a magnetic bridge, which is located inside the permanent magnet, and at least two adjacent core blocks are connected via the magnetic bridge.

12. The rotor assembly according to claim 1, characterized in that: At least one of the magnetic ring, the magnetic block or the core block is provided with a positioning structure, and the positioning structure is used to determine the relative position of the permanent magnet and the rotor core.

13. The rotor assembly according to claim 12, characterized in that: The core block is provided with the positioning structure, and the positioning structure is a positioning hole, and the positioning hole is arranged through the core block.

14. The motor is characterized by: Comprising a rotor assembly as claimed in any one of claims 1 to 13.

15. A household appliance, characterized in that: Includes the motor as claimed in claim 14.

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