Rotor assembly, motor and electric equipment

Abstract

The utility model discloses a rotor assembly, a motor and electric equipment, and relates to the permanent magnet motor technology field, the rotor assembly comprises a rotor iron core and a plurality of mixed magnetic groups, the mixed magnetic groups are arranged on the rotor iron core, each mixed magnetic group comprises at least two first permanent magnets and at least one second permanent magnet, the at least one second permanent magnet is arranged between the two first permanent magnets, the first permanent magnets are arranged close to the edge of the rotor iron core, the first permanent magnets are rare earth permanent magnets, the second permanent magnets are arranged close to the axis of the rotor iron core, and the second permanent magnets are non-rare earth permanent magnets. The utility model aims to improve the overall magnetizing effect through the rotor assembly and improve the performance of the motor.

Description

Technical Field

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

[0002] At present, permanent magnet motors have the advantages of simple and reliable structure, high efficiency, and large power density, and are widely used.

[0003] There are two existing methods for magnetizing the rotor structure of permanent magnet motors. One is to magnetize the magnetic steel first and then assemble it with the rotor core, and the other is to assemble it with the rotor core first and then magnetize the whole. Since the method of assembling first and then magnetizing the whole has higher installation efficiency and production efficiency, and has higher magnetic field consistency, it has been gradually applied in some permanent magnet motors with simple structures.

[0004] However, with the continuous optimization of the rotor topology structure of the motor, the effect after the whole magnetization of some more complex rotor structures is relatively limited. Summary of the Utility Model

[0005] The main purpose of the utility model is to propose a rotor assembly, a motor and an electrical equipment, aiming to improve the effect of the whole magnetization through the rotor assembly and improve the performance of the motor.

[0006] To achieve the above object, the utility model proposes a rotor assembly, which includes:

[0007] A rotor core; and

[0008] A plurality of hybrid magnetic groups arranged on the rotor core, each hybrid magnetic group includes at least two first permanent magnets and at least one second permanent magnet, and at least one second permanent magnet is arranged between the two first permanent magnets;

[0009] The first permanent magnet is arranged close to the edge of the rotor core, the first permanent magnet is a rare earth permanent magnet, the second permanent magnet is arranged close to the axis of the rotor core, and the second permanent magnet is a non-rare earth permanent magnet.

[0010] In one embodiment, the first permanent magnet extends from the axis of the rotor core to the edge direction of the rotor core;

[0011] The two first permanent magnets are axially symmetrically arranged with respect to the second permanent magnet located between them.

[0012] In one embodiment, in adjacent two hybrid magnetic groups, the distance between adjacent two first permanent magnets gradually decreases from the axis of the rotor core to the edge of the rotor core.

[0013] In one embodiment, two adjacent ones of the first permanent magnets are arranged at an included angle, and the included angle is defined as α, where the value range of α is 0≤α≤360° / P, and P is the number of rotor poles.

[0014] In one embodiment, the rotor core is provided with a plurality of magnetic barrier structures, and at least one magnetic barrier structure is provided between every two adjacent hybrid magnetic groups;

[0015] Some of the magnetic barrier structures are located between the first permanent magnet and the second permanent magnet.

[0016] In one embodiment, the magnetic barrier structure penetrates at least part of the rotor core along the axis direction of the rotor core.

[0017] In one embodiment, the rotor core is further provided with a plurality of first magnetic slots and a plurality of second magnetic slots, each first permanent magnet is disposed in one of the first magnetic slots, and each second permanent magnet is disposed in one of the second magnetic slots;

[0018] The magnetic barrier structure is communicated with the first magnetic slot and / or the second magnetic slot.

[0019] In one embodiment, one magnetic barrier structure is provided between two adjacent hybrid magnetic groups, and the magnetic barrier structure is communicated with two adjacent first magnetic slots;

[0020] The rotor core includes a plurality of first magnetic bridges, and the first magnetic bridges are disposed between the second magnetic slot and the adjacent magnetic barrier structure.

[0021] In one embodiment, some of the plurality of first magnetic bridges form a broken slot;

[0022] The broken slot communicates the second magnetic slot and the magnetic barrier structure, and air or a poor magnetic conductive material is provided in the broken slot.

[0023] In one embodiment, two magnetic barrier structures are provided between two adjacent hybrid magnetic groups, and each magnetic barrier structure is communicated with the adjacent first magnetic slot and the second magnetic slot;

[0024] The rotor core includes a plurality of second magnetic bridges, and the second magnetic bridges are disposed between two adjacent magnetic barrier structures.

[0025] In one embodiment, some of the plurality of second magnetic bridges form a broken slot;

[0026] The broken slot communicates the two magnetic barrier structures, and air or a poor magnetic conductive material is provided in the broken slot.

[0027] In one embodiment, each of the hybrid magnetic groups includes two first permanent magnets and two second permanent magnets, and the two second permanent magnets are disposed at intervals between the two first permanent magnets;

[0028] The rotor core further includes a plurality of third magnetic bridges, and the third magnetic bridges are located between two adjacent second permanent magnets.

[0029] In one embodiment, the rotor core is further provided with a plurality of magnetic isolation holes;

[0030] The magnetic isolation holes are located at one end of the first permanent magnet facing the edge of the rotor core.

[0031] In one embodiment, the maximum embedded depth of the first permanent magnet from the circumferential surface of the rotor core is less than 12 mm;

[0032] Alternatively, defining the radius of the rotor core as R, the maximum embedded depth of the first permanent magnet from the circumferential surface of the rotor core is less than 0.5R.

[0033] In one embodiment, the magnetization direction of the first permanent magnet is the same as its width direction;

[0034] The magnetic polarities of the opposite sides of the two first permanent magnets in the same hybrid magnetic group are the same.

[0035] In one embodiment, the magnetization direction of the second permanent magnet is the same as its width direction;

[0036] The magnetic polarity of the side of the second permanent magnet facing the edge direction of the rotor core is the same as the magnetic polarities of the opposite sides of the two adjacent first permanent magnets.

[0037] The present utility model further provides a motor, including the above-mentioned rotor assembly.

[0038] The present utility model further provides an electrical equipment, including the above-mentioned motor.

[0039] The rotor assembly of the present utility model includes a rotor core and a plurality of hybrid magnetic groups. The hybrid magnetic groups are arranged on the rotor core. Each hybrid magnetic group includes two first permanent magnets and at least one second permanent magnet. At least one second permanent magnet is arranged between the two first permanent magnets. Among them, the first permanent magnet is a rare earth permanent magnet and is arranged near the edge of the rotor core, and the second permanent magnet is a non-rare earth permanent magnet and is arranged near the axis of the rotor core. By setting the first permanent magnet as a rare earth permanent magnet and setting the second permanent magnet located between the two first permanent magnets as a non-rare earth permanent magnet, when the rotor assembly is magnetized as a whole, it can ensure that the first permanent magnet near the edge of the rotor core is magnetized to saturation, so as to improve the magnetization effect of the rare earth permanent magnet. At the same time, the second permanent magnet near the axis of the rotor core is magnetized to ensure the magnetization effect of the second permanent magnet. Thus, on the basis of realizing overall magnetization, the overall magnetization effect of the rotor assembly with this hybrid structure is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0041] Figure 1 is a schematic structural diagram of the rotor assembly in an embodiment of the present utility model;

[0042] Figure 2 is Figure 1 a partial enlarged view of part A in

[0043] Figure 3 is a schematic structural diagram of the rotor assembly in another embodiment of the present utility model;

[0044] Figure 4 is a schematic structural diagram of the rotor assembly in still another embodiment of the present utility model.

[0045] Explanation of the reference numerals in the drawings:

[0046] 100, rotor assembly; 1, rotor core; 11, first magnetic slot; 12, second magnetic slot; 13, magnetic barrier structure; 14, first magnetic bridge; 15, second magnetic bridge; 16, third magnetic bridge; 17, magnetic isolation hole; 2, hybrid magnetic group; 21, first permanent magnet; 22, second permanent magnet; 23, included angle region; 3, magnetic pole region.

[0047] The realization of the object, functional features and advantages of the present utility model will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] Next, in combination with the accompanying drawings in the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0049] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present utility model, the directional indications are only used to explain the relative positional relationship and movement conditions between components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0050] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, if "and / or" or "and / or" appears throughout the text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or a solution where A and B are satisfied simultaneously. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0051] To achieve the above object, please refer to Figures 1 to 4 As shown, the present utility model provides a rotor assembly 100. The rotor assembly 100 includes a rotor core 1 and a plurality of hybrid magnetic groups 2. The hybrid magnetic groups 2 are disposed on the rotor core 1. Each hybrid magnetic group 2 includes at least two first permanent magnets 21 and at least one second permanent magnet 22. At least one second permanent magnet 22 is disposed between the two first permanent magnets 21. The first permanent magnets 21 are disposed near the edge of the rotor core 1, and the second permanent magnets 22 are disposed near the axis of the rotor core 1. The first permanent magnets 21 are rare earth permanent magnets, and the second permanent magnets 22 are non-rare earth permanent magnets.

[0052] In this embodiment, the rotor core 1 includes a plurality of rotor punching sheets stacked axially. The rotor punching sheets are silicon steel sheets and are circular in shape, so that the outer surface of the formed rotor core 1 has a cylindrical structure. Along the direction of the rotation axis of the rotor core 1, a first magnetic slot 11 and a second magnetic slot 12 are provided through each rotor punching sheet, so that the first magnetic slot 11 and the second magnetic slot 12 penetrate the entire rotor core 1 along the rotation axis of the rotor core 1.

[0053] In this embodiment, the rotor assembly 100 includes a plurality of hybrid magnetic groups 2. The plurality of hybrid magnetic groups 2 are centrally symmetrically distributed around the axis of the rotor core 1. Each hybrid magnetic group 2 includes at least two first permanent magnets 21 and at least one second permanent magnet 22. Each first permanent magnet 21 is disposed in the first magnetic slot 11 of the rotor core 1, and each second permanent magnet 22 is disposed in the second magnetic slot 12 of the rotor core 1. And in the same hybrid magnetic group 2, at least one second magnetic slot 12 is disposed between every two first magnetic slots 11, so that at least one second permanent magnet 22 is disposed between two first permanent magnets 21.

[0054] It can be understood that the first permanent magnet 21 and the second permanent magnet 22 are respectively embedded in the rotor core 1 through the first magnetic slot 11 and the second magnetic slot 12. Therefore, compared with the surface-mounted alternating-pole permanent magnet motor in the related art, the magnetic concentrating ability of the rotor assembly 100 can be effectively improved, the magnetic flux of the rotor assembly 100 can be enhanced, and the torque performance of the motor with the rotor assembly 100 can be improved.

[0055] In this embodiment, the rotor assembly 100 is a hybrid-structured rotor, that is, it includes both permanent magnets arranged in a spoke shape and permanent magnets arranged in a straight line shape. Specifically, the first permanent magnets 21 in the plurality of hybrid magnetic groups 2 are arranged in a substantially spoke-like extension, and the second permanent magnets 22 are disposed between two first permanent magnets 21 and extend in a straight line. The second permanent magnets 22 in the plurality of hybrid magnetic groups 2 are arranged at annular intervals around the axis of the rotor core 1. At the same time, the second permanent magnets 22 are located at one end of the first permanent magnets 21 adjacent to the axis of the rotor core 1, so that a magnetic pole region 3 is formed by enclosing the side of the second permanent magnet 22 facing the edge of the rotor core 1 and two adjacent first permanent magnets 21.

[0056] Further, the first permanent magnet 21 and the second permanent magnet 22 can be in the shape of a cuboid, a tile shape with a curvature or a strip structure, etc. In the same rotor assembly 100, the first permanent magnet 21 and the second permanent magnet 22 with different shapes can be used in combination to increase the flexibility of the layout in the rotor core 1. Further, in this embodiment, the first permanent magnet 21 can be in a strip structure, with one end pointing to the rotation center of the rotor core 1 and the other end extending towards the edge of the rotor core 1, so as to form two side walls that are parallel to each other or at an angle in the circumferential direction of the rotor core 1. Further, the second permanent magnet 22 can be in a tile shape with a curvature or a cuboid shape extending along a straight line. The second permanent magnet 22 is disposed between two adjacent first permanent magnets 21 and extends from one first permanent magnet 21 to the other first permanent magnet 21 along the circumferential direction of the rotor core 1, and two side walls are formed at both ends of the second permanent magnet 22 along the circumferential direction of the rotor core 1.

[0057] The first permanent magnet 21 and the second permanent magnet 22 are two magnets with different materials. Moreover, the material of the first permanent magnet 21 is a rare earth permanent magnet, such as a neodymium iron boron permanent magnet, and the material of the second permanent magnet 22 is a ferrite permanent magnet.

[0058] It can be understood that the rotor structure in this application is a hybrid structure, that is, it simultaneously has permanent magnets arranged in a spoke structure layout and permanent magnets arranged in a straight-line layout. The traditional overall magnetization method cannot magnetize the rotor structure of this configuration. In this application, by setting multiple hybrid magnetic groups 2, and setting the first permanent magnet 21 in each hybrid magnetic group 2 as a rare earth permanent magnet, and setting the second permanent magnet 22 in each hybrid magnetic group 2 as a non-rare earth permanent magnet such as ferrite, it can not only ensure the magnetic energy output effect of the rotor assembly 100, but also reduce the use of high-grade permanent magnets such as rare earth materials, reduce costs, and at the same time enable the external magnetization circuit to magnetize multiple hybrid magnetic groups 2 as a whole, thereby facilitating the design of the external magnetization circuit and effectively improving the overall magnetization effect of the rotor assembly 100.

[0059] It can be understood that when the external magnetization circuit magnetizes multiple hybrid magnetic groups 2 as a whole, since the first permanent magnet 21 is a rare earth permanent magnet, it has a higher magnetic energy product and higher coercivity, and a greater magnetic field intensity is required for magnetizing the first permanent magnet 21, and the magnetization difficulty is higher. Therefore, the first permanent magnet 21 is disposed at the edge of the rotor core 1 where it is easier to magnetize to ensure the magnetization effect of the first permanent magnet 21. And the second permanent magnet 22 is a non-rare earth permanent magnet, which has a lower magnetic energy product and coercivity, and the magnetization difficulty for it is relatively low. Therefore, it is disposed near the axis of the rotor core 1 of the rotor core 1, which can also ensure the magnetization effect of the second permanent magnet 22. Thus, on the basis of realizing overall magnetization, the overall magnetization effect of the rotor assembly 100 can also be ensured, effectively improving the first permanent magnet 21 and the second permanent magnet 22.

[0060] The rotor assembly 100 of the present utility model includes a rotor core 1 and a plurality of hybrid magnetic groups 2. The hybrid magnetic groups 2 are arranged on the rotor core 1. Each hybrid magnetic group 2 includes two first permanent magnets 21 and at least one second permanent magnet 22. At least one second permanent magnet 22 is arranged between the two first permanent magnets 21. Among them, the first permanent magnet 21 is a rare earth permanent magnet, and the second permanent magnet 22 is a non-rare earth permanent magnet. The second permanent magnet 22 is located at one end of the first permanent magnet 21 adjacent to the axis of the rotor core 1. By setting the first permanent magnet 21 as a rare earth permanent magnet and the second permanent magnet 22 located between the two first permanent magnets 21 as a non-rare earth permanent magnet, when the rotor assembly 100 is integrally magnetized, it can ensure that the first permanent magnet 21 near the edge of the rotor core 1 is magnetized to saturation, so as to improve the magnetization effect of the rare earth permanent magnet. At the same time, the second permanent magnet 22 near the axis of the rotor core 1 is magnetized to ensure the magnetization effect of the second permanent magnet 22, and both the first permanent magnet 21 and the second permanent magnet 22 can be magnetized to saturation, so as to ensure the overall magnetization effect of the rotor assembly 100 with this hybrid structure.

[0061] In one embodiment, as Figure 1 、 Figure 3 and Figure 4 shown, the first permanent magnet 21 extends from the axis of the rotor core 1 towards the edge of the rotor core 1; the two first permanent magnets 21 are symmetrically arranged about the second permanent magnet 22 located between them.

[0062] It can be understood that the first permanent magnets 21 in the plurality of hybrid magnetic groups 2 all extend from the axis of the rotor core 1 towards the edge of the rotor core 1. The second permanent magnet 22 is located between the two first permanent magnets 21. At the same time, the second permanent magnet 22 is located at one end of the two first permanent magnets 21 adjacent to the axis of the rotor core 1. At the same time, the two first permanent magnets 21 are symmetrically distributed about the middle second permanent magnet 22. With such a setting, when the external magnetization circuit magnetizes the plurality of hybrid magnetic groups 2 integrally, it can ensure that the first permanent magnets 21 on both sides of the same second permanent magnet 22 have the same magnetization effect, ensuring the consistency of the magnetization of the two first permanent magnets 21. So that after the rotor assembly 100 is integrally magnetized, it has high integrity and consistency, effectively improving the overall magnetization effect of the rotor assembly 100 and enhancing the performance during the operation of the motor.

[0063] In one embodiment, as Figures 1 to 4 shown, in adjacent two hybrid magnetic groups 2, the distance between adjacent two first permanent magnets 21 gradually decreases from the axis of the rotor core 1 towards the edge of the rotor core 1.

[0064] It can be understood that among two adjacent hybrid magnetic groups 2, for every two adjacent first permanent magnets 21, they are arranged at an angle from the axis of the rotor core 1 to the edge of the rotor core 1. That is, for the two first permanent magnets 21 in each hybrid magnetic group 2, they are respectively arranged at an angle with one first permanent magnet 21 in another adjacent hybrid magnetic group 2. At the same time, the distance between two adjacent first permanent magnets 21 in two adjacent hybrid magnetic groups 2 also gradually decreases from the axis of the rotor core 1 to the edge direction of the rotor core 1. With such an arrangement, the two first permanent magnets 21 in the same hybrid magnetic group 2 can gradually extend in a direction away from the second permanent magnet 22, so that the area of the magnetic pole region 3 formed by the two first permanent magnets 21 and the second permanent magnet 22 located therebetween is larger, and is arranged in a fan shape towards the edge direction of the rotor core 1. When magnetizing as a whole, the external magnetizing circuit can better magnetize the first permanent magnet 21 and the second permanent magnet 22, effectively improving the overall magnetizing effect of the rotor assembly 100.

[0065] In one embodiment, as Figure 1 and Figure 3 shown, two adjacent first permanent magnets 21 are arranged at an angle, and the included angle is defined as α, and the value range of α is 0 ≤ α ≤ 360° / P, where P is the number of rotor poles.

[0066] It can be understood that within the magnetic pole region 3 composed of every two first permanent magnets 21 and at least one second permanent magnet 22 located therebetween, the magnetism is the same, and in the rotor assembly 100, magnetic pole regions 3 with the same number as the hybrid magnetic groups 2 are formed, arranged alternately with S poles and N poles. The number of hybrid magnetic groups 2 is the number of poles P of the rotor assembly 100, and the degree of the above-mentioned included angle is less than or equal to 360° / P, which also ensures that the included angle between two adjacent first permanent magnets 21 in two adjacent hybrid magnetic groups 2 will not be too large, resulting in a larger structural volume of the middle rotor core 1 and a reduction in the permanent magnet placement area, effectively ensuring the magnetic flux of the rotor assembly 100 and avoiding serious magnetic saturation of the rotor core 1, so as to ensure the performance of the rotor assembly 100 and the overall motor with the rotor assembly 100.

[0067] In one embodiment, as Figure 1 、 Figure 3 and Figure 4 shown, the rotor core 1 is provided with a plurality of magnetic barrier structures 13, and at least one magnetic barrier structure 13 is provided between every two adjacent hybrid magnetic groups 2; some magnetic barrier structures 13 are located between the first permanent magnet 21 and the second permanent magnet 22.

[0068] In this embodiment, the rotor core 1 is formed with a plurality of magnetic barrier structures 13. The magnetic barrier structures 13 are located between two adjacent hybrid magnetic groups 2. The magnetic barrier structure 13 is a cavity structure formed inside the rotor core 1. Further, the magnetic barrier structure 13 can be disposed between adjacent first permanent magnets 21 of two adjacent hybrid magnetic groups 2, or can be disposed between adjacent second permanent magnets 22 of two adjacent hybrid magnetic groups 2, or can also be disposed at the connection between the first permanent magnet 21 and the second permanent magnet 22 of two adjacent hybrid magnetic groups 2. And the magnetic barrier structure 13 can be a separate cavity structure, or a cavity structure communicating with the first magnetic slot 11 and / or the second magnetic slot 12, or part of the magnetic barrier structure 13 is located between the first permanent magnet 21 and the second permanent magnet 22, that is, the magnetic barrier structure 13 is a cavity structure formed by enclosing the first permanent magnet 21 and / or the second permanent magnet 22 with the first magnetic slot 11 and / or the second magnetic slot 12, which is not limited herein.

[0069] It can be understood that magnetic force lines are difficult to pass through the magnetic barrier structure 13 of the cavity structure. By setting the magnetic barrier structure 13, it is possible to avoid generating more closed magnetic circuits between two adjacent hybrid magnetic groups 2 and between the first permanent magnet 21 and the second permanent magnet 22 in the same hybrid magnetic group 2, so as to reduce the short-circuit magnetic flux and increase the effective magnetic flux linked with the stator of each hybrid magnetic group 2 and the first permanent magnet 21 and the second permanent magnet 22 in each hybrid magnetic group 2, thereby improving the torque performance of the motor having the rotor assembly 100.

[0070] In one embodiment, the magnetic barrier structure 13 penetrates at least part of the rotor core 1 along the axial direction of the rotor core 1. It can be understood that the magnetic barrier structure 13 is a cavity structure, which can be a through hole penetrating the rotor core 1 along the axial direction of the rotor core 1, or a groove structure penetrating part of the rotor core 1 along the axial direction of the rotor core 1. The cross-section of the magnetic barrier structure 13 along the axial direction of the rotor core 1 can be a polygon, such as a triangle or a quadrilateral, or a curved arc figure such as an ellipse or a circle, or a layered cavity structure arranged in one layer of the entire rotor core 1, which is not limited herein.

[0071] In one embodiment, as Figure 1 、 Figure 3 and Figure 4 shown, the rotor core 1 is further provided with a plurality of first magnetic slots 11 and a plurality of second magnetic slots 12. Each first permanent magnet 21 is disposed in a first magnetic slot 11, and each second permanent magnet 22 is disposed in a second magnetic slot 12; the magnetic barrier structure 13 communicates with the first magnetic slot 11 and / or the second magnetic slot 12.

[0072] It can be understood that the rotor core 1 is provided with a plurality of first magnetic slots 11 and a plurality of second magnetic slots 12. The plurality of first magnetic slots 11 and the plurality of second magnetic slots 12 are symmetrically arranged about the rotation center of the rotor core 1 on the rotor core 1. At least one second magnetic slot 12 is located between two adjacent first magnetic slots 11. Each first permanent magnet 21 is arranged in a first magnetic slot 11, and each second permanent magnet 22 is arranged in a second magnetic slot 12. The magnetic barrier structure 13 can be connected to both the first magnetic slot 11 and the second magnetic slot 12 at the same time, so that a closed magnetic circuit cannot be generated between the first permanent magnet 21 in the first magnetic slot 11 and the second permanent magnet 22 in the second magnetic slot 12, effectively reducing the magnetic leakage between the first permanent magnet 21 and the second permanent magnet 22.

[0073] In one embodiment, as Figure 1 shown, a magnetic barrier structure 13 is provided between two adjacent hybrid magnetic groups 2, and the magnetic barrier structure 13 is connected to two adjacent first magnetic slots 11; the rotor core 1 includes a plurality of first magnetic bridges 14, and the first magnetic bridges 14 are arranged between the second magnetic slot 12 and the adjacent magnetic barrier structure 13.

[0074] In this embodiment, a magnetic barrier structure 13 is provided between two adjacent hybrid magnetic groups 2. Based on each hybrid magnetic group 2, the second permanent magnet 22 is arranged at one end of the first permanent magnet 21 adjacent to the rotor core 1, and an included angle region 23 is formed at the connection between the first permanent magnet 21 and the second permanent magnet 22. Therefore, a part of the magnetic barrier structure 13 extends into the included angle region 23 and is located between the first permanent magnet 21 and the second permanent magnet 22. At the same time, the magnetic barrier structure 13 is located between two adjacent hybrid magnetic groups 2.

[0075] It can be understood that a first magnetic bridge 14 is provided between each magnetic barrier structure 13 and an adjacent second magnetic slot 12, so that the second permanent magnet 22 is firmly arranged in the second magnetic slot 12. By making a part of the magnetic barrier structure 13 extend into the included angle region 23 at the connection between the first permanent magnet 21 and the second permanent magnet 22, and the first magnetic slot 11 is connected to the magnetic barrier structure 13, it is difficult for the magnetic force lines generated by the first permanent magnet 21 and the second permanent magnet 22 to pass through the magnetic barrier structure 13, which can effectively reduce the magnetic leakage between the first permanent magnet 21 and the second permanent magnet 22, and also reduce the magnetic leakage between two adjacent hybrid magnetic groups 2. At the same time, the first magnetic bridge 14 can also ensure the overall structural strength of the rotor core 1 and the structural strength between the first magnetic slot 11 and the second magnetic slot 12.

[0076] In one embodiment, a part of the plurality of first magnetic bridges 14 forms a broken slot; the broken slot communicates with the second magnetic slot 12 and the magnetic barrier structure 13, and air or a poor magnetic conductive material is arranged in the broken slot.

[0077] It can be understood that the broken groove is provided on the first magnetic bridge 14. The broken groove extends from the magnetic barrier structure 13 towards the second magnetic groove 12 and communicates with the magnetic barrier structure 13 and the second magnetic groove 12. By providing broken grooves on some of the multiple first magnetic bridges 14, on the one hand, the remaining structure of the first magnetic bridge 14, that is, the first magnetic bridge 14 structures on both sides of the broken groove wall, still has a certain structural strength, ensuring that the overall rotor core 1 has a certain structural strength. At the same time, air or poor magnetic conductive materials can be filled in the broken grooves to reduce the magnetic leakage between the first permanent magnet 21 and the second permanent magnet 22 on both sides of the first magnetic bridge 14, further enhancing the magnetic concentrating ability of the first permanent magnet 21 and the second permanent magnet 22, and enhancing the effective magnetic flux linked with the stator. Among them, the poor magnetic conductive material can be a non-metallic material, such as a polymer material, etc., which is not limited here.

[0078] In one embodiment, as Figure 3 and Figure 4 shown, two magnetic barrier structures 13 are provided between two adjacent hybrid magnetic groups 2, and each magnetic barrier structure 13 communicates with the adjacent first magnetic groove 11 and second magnetic groove 12; the rotor core 1 includes a plurality of second magnetic bridges 15, and the second magnetic bridges 15 are provided between two adjacent magnetic barrier structures 13.

[0079] In this embodiment, between two adjacent hybrid magnetic groups 2, two magnetic barrier structures 13 are provided. The two magnetic barrier structures 13 are arranged oppositely, and one end of each magnetic barrier structure 13 communicates with the first magnetic groove 11 and the second magnetic groove 12 in the adjacent hybrid magnetic group 2. A second magnetic bridge 15 is formed between the other end of each magnetic barrier structure 13 and the other magnetic barrier structure 13.

[0080] In this embodiment, one magnetic barrier structure 13 is provided between two adjacent hybrid magnetic groups 2. Based on each hybrid magnetic group 2, the second permanent magnet 22 is provided at one end of the first permanent magnet 21 adjacent to the rotor core 1, and an included angle region 23 is formed at the connection between the first permanent magnet 21 and the second permanent magnet 22. Therefore, a part of the magnetic barrier structure 13 extends into the included angle region 23 and is located between the first permanent magnet 21 and the second permanent magnet 22. At the same time, the magnetic barrier structure 13 is located between two adjacent hybrid magnetic groups 2.

[0081] It can be understood that, based on the first magnetic bridge 14, two relatively spaced magnetic barrier structures 13 can be provided between the two hybrid magnetic groups 2, and a second magnetic bridge 15 can be provided between the two magnetic barrier structures 13 to enhance the structural strength of the rotor core 1. Or by making part of the magnetic barrier structure 13 extend into the included angle region 23 at the connection of the first permanent magnet 21 and the second permanent magnet 22, and connecting each magnetic barrier structure 13 to both the first magnetic slot 11 and the second magnetic slot 12 at the same time, it is difficult for the magnetic force lines generated by the first permanent magnet 21 and the second permanent magnet 22 to pass through the magnetic barrier structure 13 and reach the second magnetic slot 12, further improving the magnetic isolation effect on the first permanent magnet 21 and the second permanent magnet 22, and maintaining the structural strength of the rotor core 1 through the second magnetic bridge 15.

[0082] In one embodiment, part of the plurality of second magnetic bridges 15 forms a broken slot; the broken slot communicates with the two magnetic barrier structures 13, and air or a poor magnetic conductive material is provided in the broken slot.

[0083] It can be understood that the broken slot is provided on part of the plurality of second magnetic bridges 15, the broken slot extends from one magnetic barrier structure 13 to an adjacent another magnetic barrier structure 13, and communicates with the two magnetic barrier structures 13. By providing the broken slot on part of the plurality of second magnetic bridges 15, on the one hand, the remaining structure of the second magnetic bridge 15, that is, the second magnetic bridge 15 structures on both sides of the broken slot wall, still has a certain structural strength, ensuring that the overall rotor core 1 has a certain structural strength. At the same time, the leakage magnetic flux between the first permanent magnet 21 and the second permanent magnet 22 on both sides of the second magnetic bridge 15 can be reduced by filling air or a poor magnetic conductive material in the broken slot, further improving the magnetic concentrating ability of the first permanent magnet 21 and the second permanent magnet 22, and improving the effective magnetic flux linked with the stator. Among them, the poor magnetic conductive material can be a non-metallic material, such as a polymer material, etc., which is not limited herein.

[0084] In one embodiment, as Figure 4 shown, each hybrid magnetic group 2 includes two first permanent magnets 21 and two second permanent magnets 22, and the two second permanent magnets 22 are spaced between the two first permanent magnets 21; the rotor core 1 further includes a plurality of third magnetic bridges 16, and the third magnetic bridges 16 are located between two adjacent second permanent magnets 22.

[0085] In this embodiment, each hybrid magnetic group 2 includes two first permanent magnets 21 and two second permanent magnets 22, and the two second permanent magnets 22 are relatively and spaced between the two first permanent magnets 21. After the first magnetic slot 11 and the second magnetic slot 12 are formed on the rotor core 1, to ensure the overall structural strength of the rotor core 1, a second magnetic bridge 15 is formed between every two adjacent second magnetic slots 12, and both sides of the second magnetic bridge 15 are at least part of the side walls of the two second magnetic slots 12.

[0086] It can be understood that the second magnetic bridge 15 is a structural support member and a connecting member for forming the second magnetic groove 12. Through the second magnetic bridge 15, the stable formation of two second magnetic grooves 12 can be achieved, so that the rotor core 1 and the entire rotor assembly 100 maintain a high mechanical structure strength, and the second permanent magnet 22 can be firmly arranged in the second magnetic groove 12, and the overall structural strength of the rotor core 1 can be ensured.

[0087] In one embodiment, as Figures 1 to 4 shown, the rotor core 1 is further provided with a plurality of magnetic isolation holes 17; the magnetic isolation holes 17 are located at one end of the first permanent magnet 21 facing the edge of the rotor core 1.

[0088] It can be understood that by arranging a magnetic barrier structure 13 between two adjacent hybrid magnetic groups 2, magnetic leakage between the adjacent first permanent magnet 21 and the second permanent magnet 22 can be prevented. However, the end of the first permanent magnet 21 will still generate a closed magnetic circuit through other regions of the rotor core 1 to cause magnetic leakage. Therefore, by arranging magnetic isolation holes 17 at one end of the first permanent magnet 21 facing the edge of the rotor core 1, the first permanent magnet 21 can be prevented from generating a closed magnetic circuit at the end to cause magnetic leakage, further improving the magnetic leakage prevention effect of the rotor assembly 100, improving the magnetic concentrating ability of the hybrid magnetic group 2, increasing the effective magnetic flux linked with the stator, and thus improving the torque and performance of the motor.

[0089] In one embodiment, the maximum embedded depth of the first permanent magnet from the circumferential surface of the rotor core is less than 12 mm or the radius of the rotor core is defined as R, and the maximum embedded depth of the first permanent magnet from the circumferential surface of the rotor core is less than 0.5R. It can be understood that the first magnetic groove 11 penetrates the rotor core 1 along the axis direction of the rotor core 1, and the first permanent magnet 21 also extends into the first magnetic groove 11 along the axis direction of the rotor core 1. Since the first permanent magnet 21 is a rare earth permanent magnet and the rare earth permanent magnet has a high coercivity, when the first permanent magnet 21 is integrally magnetized through an external magnetization circuit, a relatively large magnetic field intensity is required and the magnetization difficulty is relatively large. Therefore, the maximum embedded depth of the first permanent magnet 21 from the circumferential surface of the rotor core 1 is limited to less than 12 mm, or according to the radius of the rotor core 1, its maximum embedded depth is adaptively limited to less than 0.5R, so as to ensure that the entire first permanent magnet 21 can be affected by a sufficient magnetization magnetic field, ensure that the first permanent magnet 21 can be fully magnetized during overall magnetization, ensure that the first permanent magnet 21 can reach the saturation state, and improve the effect of the first permanent magnet 21 and the overall magnetization effect of the rotor assembly 100.

[0090] In one embodiment, as Figure 1 shown, the magnetization direction of the first permanent magnet 21 is the same as its width direction; the magnetic polarities of the opposite sides of the two first permanent magnets 21 in the same hybrid magnetic group 2 are the same.

[0091] In this embodiment, the first permanent magnet 21 has a long strip structure. The length direction of the first permanent magnet 21 is defined as the direction extending from adjacent to the axis of the rotor core 1 towards the edge of the rotor core 1. The direction perpendicular to the length direction of the first permanent magnet 21 is the width direction of the first permanent magnet 21, and this width direction is also the tangential direction along the rotor core 1. At the same time, the first permanent magnet 21 is magnetized along its width direction.

[0092] It can be understood that by arranging the two magnetic poles of the first permanent magnet 21 on both sides of the rotor core 1 in the circumferential direction, for the two first permanent magnets 21 in the same hybrid magnetic group 2, the opposite sides can ensure the same magnetic polarity, and a magnetic pole region 3 with a unified magnetic polarity is formed between the two first permanent magnets 21. That is, for the two first permanent magnets 21 in the same hybrid magnetic group 2, the magnetization direction of the first first permanent magnet 21 is from itself towards the other first permanent magnet 21 along the width direction, and the magnetization direction of the second first permanent magnet 21 is from itself towards the other first permanent magnet 21 along the width direction. Thus, each hybrid magnetic group 2 in the rotor assembly 100 forms a magnetic pole region 3 with an S pole or an N pole, and the adjacent two hybrid magnetic groups 2 are magnetic pole regions 3 with different magnetisms. The multiple hybrid magnetic groups 2 have alternately arranged S poles and N poles.

[0093] In one embodiment, as Figure 1 shown, the magnetization direction of the second permanent magnet 22 is the same as its width direction; the magnetic polarity of the side of the second permanent magnet 22 facing the edge direction of the rotor core 1 is the same as the magnetic polarity of the opposite sides of the adjacent two first permanent magnets 21.

[0094] In this embodiment, the second permanent magnet 22 has a tile-shaped structure or a cuboid structure. If it has a tile-shaped structure, the arc of the tile protrudes from the center of the rotor core 1 towards the edge of the rotor core 1, and the length direction of the second permanent magnet 22 is defined as the direction extending along the circumference of the center of the rotor core 1; if it has a cuboid structure, the length direction of the second permanent magnet 22 is defined as extending from one first permanent magnet 21 in the hybrid magnetic group 2 towards the other first permanent magnet 21. The direction perpendicular to the length direction of the second permanent magnet 22 is the width direction of the second permanent magnet 22, and this width direction is also the radial direction of the rotor core 1. At the same time, the first permanent magnet 21 is magnetized along the width direction of the second permanent magnet 22.

[0095] It can be understood that at least one second permanent magnet 22 between two adjacent first permanent magnets 21 has the same magnetization direction, which is from the edge of the rotor core 1 towards the center of the rotor core 1 or from the center of the rotor core 1 towards the edge of the rotor core 1. Specifically, a magnetic pole region 3 with a unified magnetic polarity is formed between two adjacent first permanent magnets 21 and at least one second permanent magnet 22 located therebetween. When the magnetization directions of two adjacent first permanent magnets 21 are magnetized towards the magnetic pole region 3 along the width direction of the first permanent magnet 21, the magnetization direction of at least one second permanent magnet 22 located therebetween is also set towards the magnetic pole region 3 along the width direction of the second permanent magnet 22 and towards the edge of the rotor core 1; similarly, when the magnetization directions of two adjacent first permanent magnets 21 are magnetized away from the magnetic pole region 3 along the width direction of the first permanent magnet 21, the magnetization direction of at least one second permanent magnet 22 located therebetween is also set away from the magnetic pole region 3 along the width direction of the second permanent magnet 22 and towards the center of the rotor core 1, so that the magnetic pole region 3 in the hybrid magnetic group 2 formed by the first permanent magnets 21 and the second permanent magnets 22 has a better magnetic focusing effect and forms a structure in which S poles and N poles are alternately arranged.

[0096] The present utility model also provides a motor, which includes a stator assembly and the above-mentioned rotor assembly 100. The stator assembly includes a stator core and coils wound around the stator core. The rotor assembly 100 is arranged in the center of the stator assembly, and an air gap is formed between the rotor assembly 100 and the stator assembly. The specific structure of the rotor assembly 100 refers to the foregoing embodiments. Since this motor adopts all the technical solutions of all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be elaborated herein one by one.

[0097] The present utility model also provides an electrical equipment, which includes the above-mentioned motor. The specific structure of the motor refers to the foregoing embodiments. Since this electrical equipment adopts all the technical solutions of all the foregoing embodiments, it at least has all the beneficial effects brought by the technical solutions of the foregoing embodiments, and will not be elaborated herein one by one. Among them, the electrical equipment can be a compressor with the above-mentioned motor, as well as an air conditioner, a washing machine, a refrigeration equipment, a new energy vehicle, an electric bicycle, etc. having a compressor.

[0098] The above description is only an exemplary embodiment of the present utility model, and does not limit the patent scope of the present utility model. Any equivalent structural transformation made under the technical concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present utility model.

Claims

1. A rotor assembly, characterized in that: The rotor assembly comprises: a rotor core; and A plurality of hybrid magnetic groups, wherein the hybrid magnetic groups are arranged on the rotor core, each of the hybrid magnetic groups comprises at least two first permanent magnets and at least one second permanent magnet, and at least one second permanent magnet is arranged between two of the first permanent magnets; The first permanent magnet is arranged close to the edge of the rotor core, and is a rare earth permanent magnet. The second permanent magnet is arranged close to the axis of the rotor core, and is a non-rare earth permanent magnet.

2. The rotor assembly according to claim 1, characterized in that The first permanent magnet extends from the axis of the rotor core toward the edge of the rotor core; The two first permanent magnets are arranged in an axisymmetric manner with respect to the second permanent magnet located therebetween.

3. The rotor assembly according to claim 2, characterized in that In two adjacent hybrid magnetic groups, the distance between two adjacent first permanent magnets is gradually reduced from the axis of the rotor core to the edge of the rotor core.

4. The rotor assembly according to claim 3, characterized in that: Two adjacent first permanent magnets are arranged at an angle, and the angle is defined as α. The value range of α is 0≤α≤360° / P, where P is the number of rotor poles.

5. The rotor assembly according to claim 1, wherein: The rotor core is provided with a plurality of magnetic barrier structures, and at least one magnetic barrier structure is provided between each two adjacent hybrid magnetic groups; Part of the magnetic barrier structure is located between the first permanent magnet and the second permanent magnet.

6. The rotor assembly according to claim 5, characterized in that The magnetic barrier structure passes through at least a portion of the rotor core along the axial direction of the rotor core.

7. The rotor assembly according to claim 6, characterized in that The rotor core is further provided with a plurality of first magnetic slots and a plurality of second magnetic slots, each of the first permanent magnets is provided in one of the first magnetic slots, and each of the second permanent magnets is provided in one of the second magnetic slots; The magnetic barrier structure is connected to the first magnetic groove and / or the second magnetic groove.

8. The rotor assembly according to claim 7, characterized in that A magnetic barrier structure is provided between two adjacent hybrid magnetic groups, and the magnetic barrier structure is connected to two adjacent first magnetic grooves; The rotor core includes a plurality of first magnetic bridges, and the first magnetic bridges are arranged between the second magnetic slots and the adjacent magnetic barrier structures.

9. The rotor assembly according to claim 8, characterized in that Some of the first magnetic bridges form broken slots; The broken groove is connected to the second magnetic groove and the magnetic barrier structure, and air or poor magnetic conductive material is arranged in the broken groove.

10. The rotor assembly according to claim 7, wherein: Two magnetic barrier structures are provided between two adjacent hybrid magnetic groups, and each magnetic barrier structure is connected to the adjacent first magnetic groove and the second magnetic groove; The rotor core includes a plurality of second magnetic bridges, and the second magnetic bridges are arranged between two adjacent magnetic barrier structures.

11. The rotor assembly according to claim 10, wherein: Some of the plurality of second magnetic bridges form broken slots; The broken slot connects the two magnetic barrier structures, and air or poor magnetic conductive material is arranged in the broken slot.

12. The rotor assembly according to any one of claims 1 to 11, characterized in that: Each of the hybrid magnetic groups includes two first permanent magnets and two second permanent magnets, and the two second permanent magnets are arranged between the two first permanent magnets; The rotor core further includes a plurality of third magnetic bridges, and the third magnetic bridges are located between two adjacent second permanent magnets.

13. The rotor assembly according to any one of claims 1 to 11, characterized in that: The rotor core is also provided with a plurality of magnetic isolation holes; The magnetic isolation hole is located at an end of the first permanent magnet facing the edge of the rotor core.

14. The rotor assembly according to any one of claims 1 to 11, characterized in that: The maximum embedding depth of the first permanent magnet from the circumferential surface of the rotor core is less than 12 mm; Alternatively, the radius of the rotor core is defined as R, and the maximum embedding depth of the first permanent magnet from the circumferential surface of the rotor core is less than 0.5R.

15. The rotor assembly according to any one of claims 1 to 11, characterized in that: The magnetization direction of the first permanent magnet is the same as its width direction; The magnetic polarities of the opposite sides of the two first permanent magnets in the same hybrid magnetic group are the same.

16. The rotor assembly according to claim 15, characterized in that The magnetization direction of the second permanent magnet is the same as its width direction; The magnetic polarity of the second permanent magnet on one side facing the edge of the rotor core is the same as the magnetic polarity of the opposite sides of two adjacent first permanent magnets.

17. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 16.

18. An electrical equipment, characterized in that: Comprising the motor as claimed in claim 17.

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