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 permanent magnet assembly, the rotor iron core is provided with a magnetic barrier structure, the permanent magnet assembly is arranged on the rotor iron core, the permanent magnet assembly comprises a first permanent magnet and a second permanent magnet, the magnetic barrier structures are located between the adjacent first permanent magnets and second permanent magnets; the first permanent magnet and the second permanent magnet are made of different materials. According to the rotor assembly, on the basis that the mechanical performance of the rotor assembly is guaranteed, magnetic leakage is reduced, and the performance of a motor is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of permanent magnet motors, and particularly relates to a rotor assembly, a motor and an electrical equipment. 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] Between two adjacent permanent magnets on a traditional rotor core, a connection structure with a large volume or irregular shape will be formed. This connection structure will conduct the magnetic circuit between the adjacent permanent magnets, so that part of the magnetic flux of the permanent magnets passes through the connection structure, resulting in magnetic leakage, reducing the magnetic flux linked with the stator, and thus decreasing the torque and performance of the motor. Summary of the Utility Model

[0004] The main object of the utility model is to propose a rotor assembly, which includes:

[0005] A rotor core provided with a magnetic barrier structure; and

[0006] A permanent magnet assembly arranged on the rotor core, the permanent magnet assembly includes a first permanent magnet and a second permanent magnet, and the magnetic barrier structure is located between the adjacent first permanent magnet and the second permanent magnet;

[0007] The first permanent magnet and the second permanent magnet are made of different materials.

[0008] In one embodiment, the magnetic barrier structure is along the axial direction of the rotor core, and the magnetic barrier structure penetrates at least part of the rotor core.

[0009] In one embodiment, the rotor core includes a plurality of first magnetic bridges, and the permanent magnet assembly includes a plurality of the first permanent magnets and a plurality of the second permanent magnets;

[0010] Each of the first magnetic bridges is arranged between the adjacent first permanent magnet and the second permanent magnet.

[0011] In one embodiment, one second permanent magnet is arranged between two adjacent first permanent magnets;

[0012] The magnetic barrier structure is arranged at both circumferential ends of the second permanent magnet along the rotor core, and the end of the second permanent magnet and the side wall of the first magnetic bridge enclose to form the magnetic barrier structure.

[0013] In one embodiment, the circumferential side wall of the first permanent magnet along the rotor core and the circumferential side wall of the adjacent second permanent magnet along the rotor core are arranged at an angle.

[0014] In one embodiment, the included angle is less than or equal to 180° / P, where P is the number of poles of the rotor assembly.

[0015] In one embodiment, two of the second permanent magnets are provided between two adjacent first permanent magnets;

[0016] The rotor core is further provided with a magnetic isolation groove, and the magnetic isolation groove is located between two adjacent second permanent magnets.

[0017] In one embodiment, some of the plurality of first magnetic bridges form a broken groove;

[0018] The rotor core is provided with a plurality of first magnetic slots and a plurality of second magnetic slots. Each first permanent magnet is disposed in a first magnetic slot, and each second permanent magnet is disposed in a second magnetic slot;

[0019] The broken groove communicates with the first magnetic slot and the second magnetic slot, and the broken groove is filled with air or a poor magnetic conductive material.

[0020] In one embodiment, the rotor core is further provided with a magnetic isolation hole. The magnetic isolation hole is disposed at one end of the first permanent magnet facing the axis of the rotor core, and the magnetic isolation hole communicates with the first magnetic slot.

[0021] In one embodiment, two of the second permanent magnets are provided between two adjacent first permanent magnets;

[0022] The rotor core includes a plurality of second magnetic bridges, and one second magnetic bridge is formed between every two adjacent second permanent magnets.

[0023] In one embodiment, the magnetic barrier structure is disposed at one end of the second permanent magnet facing the first permanent magnet;

[0024] Two magnetic barrier structures adjacent to the same first permanent magnet communicate with each other, and part of the first permanent magnet extends into the magnetic barrier structure.

[0025] In one embodiment, the rotor core is further provided with a magnetic isolation groove. The magnetic isolation groove is disposed at one end of the second permanent magnet adjacent to the second magnetic bridge, and the side wall of the second magnetic bridge and the side wall of the adjacent second permanent magnet form the magnetic isolation groove.

[0026] In one embodiment, some of the plurality of second magnetic bridges form a broken groove;

[0027] The rotor core is provided with a plurality of first magnetic slots and a plurality of second magnetic slots. Each first permanent magnet is disposed in a first magnetic slot, and each second permanent magnet is disposed in a second magnetic slot;

[0028] The broken slot communicates with the first magnetic slot and the second magnetic slot, and the broken slot is filled with air or a poor magnetic conductive material.

[0029] In one embodiment, the maximum magnetic energy product of the first permanent magnet is greater than that of the second permanent magnet;

[0030] The material of the first permanent magnet is rare earth permanent magnet.

[0031] In one embodiment, the magnetization direction of the first permanent magnet is the same as its width direction;

[0032] The magnetic polarities of the opposite sides of two adjacent first permanent magnets are the same.

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

[0034] 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 two adjacent first permanent magnets.

[0035] The present utility model further provides a motor, including the above rotor assembly.

[0036] The present utility model further provides an electrical equipment, including the above motor.

[0037] The rotor assembly of the present utility model includes a rotor core permanent magnet assembly. The rotor core is provided with a magnetic barrier structure. The permanent magnet assembly is arranged on the rotor core. The permanent magnet assembly includes a first permanent magnet and a second permanent magnet. The magnetic barrier structure is located between adjacent first permanent magnets and second permanent magnets. The first permanent magnet and the second permanent magnet are made of different materials. By arranging the magnetic barrier structure between the first permanent magnet and the second permanent magnet, the magnetic leakage between the first permanent magnet and the second permanent magnet can be effectively reduced, and the torque and performance of the motor can be effectively improved. Description of the Drawings

[0038] 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 drawings in the following description 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.

[0039] Figure 1 It is a schematic structural diagram of a rotor assembly in an embodiment of the present utility model;

[0040] Figure 2 For Figure 1 The partial enlarged view at A in

[0041] Figure 3Schematic diagram of the rotor assembly in another embodiment of the present utility model;

[0042] Figure 4 Schematic diagram of the rotor assembly in yet another embodiment of the present utility model;

[0043] Figure 5 Schematic diagram of the rotor assembly in still another embodiment of the present utility model;

[0044] Figure 6 Schematic 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, magnetic isolation hole; 16, second magnetic bridge; 17, magnetic isolation groove; 2, first permanent magnet; 3, second permanent magnet; 4, magnetic pole region.

[0047] The realization of the purpose, functional features and advantages of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0048] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope 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 the embodiments of the present utility model involve descriptions such as "first", "second", etc., the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying 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 scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both 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 ability of those of ordinary skill in the art to implement. 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] Please refer to Figures 1 to 6 As shown, the present utility model provides a rotor assembly 100. The rotor assembly 100 includes a rotor core 1 and a permanent magnet assembly. The rotor core 1 is provided with a magnetic barrier structure 13. The permanent magnet assembly is disposed on the rotor core 1. The permanent magnet assembly includes a first permanent magnet 2 and a second permanent magnet 3. The magnetic barrier structure 13 is located between the adjacent first permanent magnet 2 and second permanent magnet 3. The first permanent magnet 2 and the second permanent magnet 3 are made of different materials.

[0052] In this embodiment, the rotor core 1 includes a plurality of first permanent magnets 2 and a plurality of second permanent magnets 3. 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 along the rotation center of the rotor core 1. At least one second magnetic slot 12 is located between two adjacent first magnetic slots 11. Each first permanent magnet 2 is disposed in a first magnetic slot 11, and each second permanent magnet 3 is disposed in a second magnetic slot 12.

[0053] In this embodiment, the rotor core 1 includes a plurality of rotor punching sheets stacked axially. The rotor punching sheets are silicon steel sheets. The rotor punching sheets are circular so that the outer surface of the formed rotor core 1 has a cylindrical structure. Along the rotation axis direction of the rotor core 1, first magnetic slots 11 and second magnetic slots 12 are opened through each rotor punching sheet so that the first magnetic slots 11 and the second magnetic slots 12 penetrate the entire rotor core 1 along the rotation axis of the rotor core 1. Among them, 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, that is, the plurality of first magnetic slots 11 and the plurality of second magnetic slots 12 are evenly distributed in the circumferential direction about the rotation center of the rotor core 1. And at least one second magnetic slot 12 is located between two adjacent first magnetic slots 11, such as one or two.

[0054] It can be understood that multiple first permanent magnets 2 and multiple second permanent magnets 3 are respectively embedded in the rotor core 1 through the first magnetic slots 11 and the second magnetic slots 12. Thus, compared with the surface-mounted alternating-pole permanent magnet motor in the related art, the magnetic concentration 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. The first permanent magnet 2 and the second permanent magnet 3 can be magnets of the same material or two magnets of different materials. For example, one of the first permanent magnet 2 and the second permanent magnet 3 is made of a rare earth permanent magnet, such as a neodymium iron boron permanent magnet, and the other of the first permanent magnet 2 and the second permanent magnet 3 is made of a ferrite permanent magnet. There is no limitation here. It is preferred to use a mixture of rare earth permanent magnets and ferrite permanent magnets, which can not only ensure that the rotor assembly 100 outputs sufficient magnetic flux, but also reduce the use of high-grade permanent magnets such as rare earth materials and reduce costs.

[0055] In this embodiment, the rotor core 1 is formed with a magnetic barrier structure 13. The magnetic barrier structure 13 is located between adjacent first permanent magnets 2 and second permanent magnets 3. The magnetic barrier structure 13 is a cavity structure formed inside the rotor core 1. Further, when the magnetic barrier structure 13 is provided at one end of the second permanent magnet 3 facing the first permanent magnet 2, it can also be provided at one end of the second permanent magnet 3 away from the first permanent magnet 2. That is, the magnetic barrier structure 13 can be provided at at least one end of the second permanent magnet 3 along the circumferential direction of the rotor core 1, and the magnetic barrier structure 13 can be provided at the end of the second magnetic slot 12 adjacent to the adjacent first magnetic slot 11, or can be formed by enclosing the cavity wall of the first magnetic slot 11 and the side wall of the second permanent magnet 3. There is no limitation here.

[0056] It can be understood that by providing the magnetic barrier structure 13, the magnetic force lines generated by the first permanent magnet 2 and the second permanent magnet 3 are difficult to pass through the area of the magnetic barrier structure 13. Thus, it is possible to avoid generating more closed magnetic circuits between the adjacent first permanent magnet 2 and second permanent magnet 3, reduce the magnetic leakage of the first permanent magnet 2 and the second permanent magnet 3, and increase the effective magnetic flux linked with the stator by the first permanent magnet 2 and the second permanent magnet 3, thereby improving the torque performance of the motor with the rotor assembly 100.

[0057] The rotor assembly of the present utility model includes a rotor core 1 and a permanent magnet assembly. The rotor core 1 is provided with a magnetic barrier structure 13. The permanent magnet assembly is arranged on the rotor core 1. The permanent magnet assembly includes a first permanent magnet 2 and a second permanent magnet 3. The magnetic barrier structure 13 is located between adjacent first permanent magnets 2 and second permanent magnets 3; the first permanent magnet 2 and the second permanent magnet 3 are made of different materials. By providing the magnetic barrier structure 13 between the first permanent magnet 2 and the second permanent magnet 3, the magnetic leakage between the first permanent magnet 2 and the second permanent magnet 3 can be effectively reduced, and the torque and performance of the motor can be effectively improved.

[0058] 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 shape 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 here.

[0059] In one embodiment, as Figures 1 to 4 shown, the rotor core 1 includes a plurality of first magnetic bridges 14, and each first magnetic bridge 14 is disposed between the adjacent first permanent magnet 2 and the second permanent magnet 3.

[0060] In this embodiment, after the first magnetic slots 11 and the second magnetic slots 12 are formed in the rotor core 1, to ensure the overall structural strength of the rotor core 1, a first magnetic bridge 14 is formed between each first magnetic slot 11 and the adjacent second magnetic slot 12. The plurality of first magnetic bridges 14 are symmetrically distributed about the rotation center of the rotor core 1, and the plurality of first magnetic bridges 14 are radially distributed with the rotation center of the rotor core 1 as the center. Both sides of the first magnetic bridge 14 are at least part of the side walls of the first magnetic slot 11 and at least part of the side walls of the second magnetic slot 12.

[0061] It can be understood that the first magnetic bridge 14 is a structural support component and a connecting component for forming the first magnetic slot 11 and the second magnetic slot 12. Through the first magnetic bridge 14, the stable formation of the first magnetic slot 11 and the second magnetic slot 12 can be achieved, so that the rotor core 1 and the entire rotor assembly 100 maintain a high mechanical structural strength, and the first permanent magnet 2 can be firmly disposed in the first magnetic slot 11, and the second permanent magnet 3 can be firmly disposed in the second magnetic slot 12, so that the relative positions between the first permanent magnet 2 and the second permanent magnet 3 remain unchanged.

[0062] It can be understood that the first magnetic bridge 14 is disposed between each first magnetic slot 11 and an adjacent second magnetic slot 12, that is, a first magnetic bridge 14 is formed between each second permanent magnet 3 and an adjacent first permanent magnet 2. Two first magnetic bridges 14 are respectively formed between the same first permanent magnet 2 and two adjacent second permanent magnets 3 along the circumferential direction of the rotor core 1 to ensure the overall structural strength of the rotor core 1. At the same time, since the first magnetic bridge 14 will generate a small closed magnetic circuit between the adjacent first permanent magnet 2 and the second permanent magnet 3, a magnetic barrier structure 13 is formed at one end of each second magnetic slot 12 adjacent to the first magnetic bridge 14, that is, at least part of the side walls of each first magnetic bridge 14 and each adjacent second magnetic slot 12 share the side wall, and the magnetic barrier structure 13 is formed by enclosing the side wall of the end of the second permanent magnet 3. The magnetic barrier structure 13 can reduce the magnetic leakage caused by the setting of the first magnetic bridge 14, so as to reduce the short-circuit magnetic flux between the first permanent magnet 2 and the second permanent magnet 3 and improve the performance of the motor.

[0063] In an embodiment, as Figure 1 and Figure 2 shown, a second permanent magnet 3 is disposed between two adjacent first permanent magnets 2; the magnetic barrier structure 13 is disposed at both ends of the second permanent magnet 3 along the circumferential direction of the rotor core 1, and the end of the second permanent magnet 3 and the side wall of the first magnetic bridge 14 enclose to form the magnetic barrier structure 13.

[0064] It can be understood that between two adjacent first permanent magnets 2, a second permanent magnet 3 is provided, that is, the first permanent magnet 2 and the second permanent magnet 3 are alternately arranged in a ring shape with the rotation center of the rotor core 1 as the center, and a first magnetic bridge 14 is provided between each second permanent magnet 3 and two adjacent first permanent magnets 2. At this time, magnetic barrier structures 13 are formed at both ends of the second permanent magnet 3 along the circumferential direction of the rotor core 1. The magnetic barrier structure 13 is formed by enclosing the side wall of the end of the second permanent magnet 3, the side wall of the first magnetic bridge 14 and the side wall of part of the second magnetic slot. By setting the magnetic barrier structure 13, the short-circuit magnetic flux between each second permanent magnet 3 and the first permanent magnets 2 at both adjacent ends can be reduced, and the magnetic leakage at both ends of the second permanent magnet 3 in the axial direction of the rotor core 1 can be effectively reduced, and the effective magnetic flux linked with the stator can be improved.

[0065] In an embodiment, the side wall of the first permanent magnet 2 along the circumferential direction of the rotor core 1 and the side wall of the adjacent second permanent magnet 3 along the circumferential direction of the rotor core 1 are arranged at an angle.

[0066] In this embodiment, the first permanent magnet 2 and the second permanent magnet 3 can be in the shape of a cuboid, a tile shape with a radian or a bar shape, etc. In the same rotor assembly 100, the first permanent magnets 2 and the second permanent magnets 3 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 2 can be in the shape of a long bar, 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 form an angle in the circumferential direction of the rotor core 1. Further, the second permanent magnet 3 can be in the shape of a tile with a radian. The second permanent magnet 3 is arranged between two adjacent first permanent magnets 2 and extends from one first permanent magnet 2 to another first permanent magnet 2 along the circumferential direction of the rotor core 1, and two side walls are formed at both ends of the second permanent magnet 3 along the circumferential direction of the rotor core 1.

[0067] It can be understood that for the purpose of reducing the manufacturing difficulty, the side walls of the second permanent magnet 3, which is usually arranged in an arc shape, are arranged at an angle relative to the side walls of the adjacent first permanent magnet 2. Moreover, the angled arrangement can also provide a formation space for the magnetic barrier structure 13 at both ends of the second permanent magnet 3 along the circumferential direction of the rotor core 1 to prevent magnetic leakage between the first permanent magnet 2 and the second permanent magnet 3.

[0068] In one embodiment, the angle is less than or equal to 180° / P, where P is the number of poles of the rotor assembly 100. It can be understood that within each magnetic pole region 4 composed of every two first permanent magnets 2 and at least one second permanent magnet 3 located therebetween, the magnetism is the same, and multiple magnetic pole regions 4 are formed in the rotor assembly 100, with the S pole and the N pole arranged alternately. The number of the multiple magnetic pole regions 4 is the number of poles P of the rotor assembly 100. And the degree of the above angle being less than or equal to 180° / P also ensures that the angle between the first permanent magnet 2 and the second permanent magnet 3 will not be too large, resulting in a relatively large volume of the intermediate first magnetic bridge 14 structure, thereby avoiding more magnetic leakage. At the same time, it also avoids the corner missing of the overall structure of the second permanent magnet 3 due to the too large end angle, which reduces the overall size of the second permanent magnet 3 and leads to a decline in magnetic performance, so as to ensure the performance of the rotor assembly 100 and the overall motor.

[0069] In one embodiment, as Figure 3 and Figure 4 shown, two second permanent magnets 3 are arranged between two adjacent first permanent magnets 2, and the rotor core 1 is further provided with a magnetic isolation groove 17, and the magnetic isolation groove 17 is located between two adjacent second permanent magnets 3.

[0070] The two second magnetic grooves 12 are communicated with each other; the two second permanent magnets 3 and the cavity walls of part of the second magnetic grooves 12 enclose to form a magnetic barrier structure 13.

[0071] In this embodiment, between two adjacent first permanent magnets 2, two second permanent magnets 3 are provided, and a first magnetic bridge 14 is formed between one end of each second permanent magnet 3 and an adjacent first permanent magnet 2. Two second magnetic slots 12 located between two adjacent first permanent magnets 2 communicate with each other, such that the ends of the two second permanent magnets 3 away from the first permanent magnets 2 are arranged opposite to each other. The rotor core 1 is further provided with a magnetic isolation slot 17, and the magnetic isolation slot 17 is located between two adjacent second permanent magnets 3 and communicates with the two second magnetic slots.

[0072] It can be understood that the magnetic isolation slot 17 is a cavity structure having the same structure as the magnetic barrier structure 13, and the magnetic isolation slot 17 also penetrates through a part of the rotor core 1 along the axial direction of the rotor core 1. On the basis of providing the first magnetic bridge 14 between the first permanent magnet 2 and the second permanent magnet 3, a magnetic isolation slot 17 is provided between two adjacent second permanent magnets 3, and by providing the magnetic isolation slot 17, the magnetic leakage between two adjacent second permanent magnets 3 can be reduced; wherein, for the convenience of processing and manufacturing of the second permanent magnet 3 and the simplicity of installation with the rotor core 1, the second permanent magnet 3 can also adopt a cuboid structure, and in order to make the second permanent magnet 3 of the cuboid structure arranged as much as possible along the circumferential direction of the axis of the rotor core 1 and fill the area between two adjacent first permanent magnets 2 as much as possible, the second permanent magnet 3 can be provided with two or more arranged at an angle in sequence. When two second permanent magnets 3 are provided between two adjacent first permanent magnets 2, the two second permanent magnets 3 are arranged at an angle along the extending direction of their lengths, so that the side walls of each second permanent magnet 3 are parallel to the side walls of the adjacent first permanent magnet 2, making the two side edges of the first magnetic bridge 14 parallel to each other and making the width of the first magnetic bridge 14 the narrowest, reducing the magnetic leakage of the first magnetic bridge 14.

[0073] Further, at the opposite ends of the two second permanent magnets 3 having a cuboid structure, an angular region is formed, and the magnetic barrier structure 13 is provided in the angular region. Through the magnetic barrier structure 13, large magnetic leakage between the two second permanent magnets 3 can be avoided, and the effective magnetic flux linked with the stator can be increased.

[0074] In one embodiment, a magnetic barrier structure 13 is formed by enclosing the side walls of one end of each second permanent magnet 3 facing the first permanent magnet 2 and the side walls of the first magnetic bridge 14.

[0075] It can be understood that on the basis of forming the magnetic barrier structure 13 between each second permanent magnet 3 and the adjacent second permanent magnet 3, the rotor core 1 is also provided with a magnetic barrier structure 13 at one end of each second permanent magnet 3 facing the first permanent magnet 2, thereby reducing the short-circuit magnetic flux between each second permanent magnet 3 and the adjacent first permanent magnet 2, effectively reducing the magnetic leakage at both ends of the second permanent magnet 3 in the axial direction of the rotor core 1, further improving the magnetic focusing ability of the second permanent magnet 3, and increasing the effective magnetic flux linked with the stator.

[0076] In one embodiment, a part of the plurality of first magnetic bridges 14 forms a broken slot; the rotor core 1 is provided with a plurality of first magnetic slots and a plurality of second magnetic slots, each first permanent magnet 2 is disposed in a first magnetic slot, and each second permanent magnet 3 is disposed in a second magnetic slot; the broken slot communicates with the first magnetic slot and the second magnetic slot, and the broken slot is filled with air or a poor magnetic conductive material.

[0077] It can be understood that the broken slot is disposed on the first magnetic bridge 14, the broken slot extends from the first magnetic slot 11 to the second magnetic slot 12, and communicates with the first magnetic slot 11 and the second magnetic slot 12. When a magnetic barrier structure 13 is disposed at the end of the second permanent magnet 3, the broken slot is also connected to the magnetic barrier structure 13. By providing the broken slot, on the basis that the remaining structure of the first magnetic bridge 14, that is, the first magnetic bridge 14 structures on both sides of the broken slot wall still has a certain structural strength, it is ensured that the overall rotor core 1 has a certain structural strength, and the leakage magnetic flux between the first permanent magnet 2 and the second permanent magnet 3 on both sides of the first magnetic bridge 14 can also 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 2 and the second permanent magnet 3, and improving the effective magnetic flux linked with the stator. Among them, the poor magnetic conductive material can be a non-metal material, such as a polymer material, etc., which is not limited herein.

[0078] In one embodiment, as Figure 4 shown, the rotor core 1 is further provided with a magnetic isolation hole 15, the magnetic isolation hole 15 is disposed at one end of the first permanent magnet 2 facing the axis of the rotor core 1, and the magnetic isolation hole 15 communicates with the first magnetic slot 11.

[0079] It can be understood that by providing a magnetic barrier structure 13 at at least one end of the second permanent magnet 3 along the circumferential direction of the rotor core 1, the leakage magnetic flux between adjacent first permanent magnets 2 and second permanent magnets 3 can be prevented. However, the end of the first permanent magnet 2 will still generate a closed magnetic circuit with the second permanent magnet 3 through other regions of the rotor core 1, resulting in leakage magnetic flux. Therefore, by providing a magnetic isolation hole 15 at one end of the first permanent magnet 2 facing the rotation center of the rotor core 1, the closed magnetic circuit generated between the first permanent magnet 2 and the two adjacent second permanent magnets 3 at the end can be avoided, further improving the anti-leakage magnetic flux effect of the rotor assembly 100, so as to improve the magnetic concentrating ability of the first permanent magnet 2 and the second permanent magnet 3, and improve the effective magnetic flux linked with the stator, thereby improving the torque and performance of the motor.

[0080] In one embodiment, as Figure 5 and Figure 6 shown, two second permanent magnets 3 are provided between two adjacent first permanent magnets 2; the rotor core 1 includes a plurality of second magnetic bridges 16, and a second magnetic bridge 16 is formed between every two adjacent second permanent magnets 3.

[0081] In this embodiment, after the first magnetic slots 11 and the second magnetic slots 12 are formed on the rotor core 1, in order to ensure the overall structural strength of the rotor core 1, a second magnetic bridge 16 is formed between every two adjacent second magnetic slots 12. A plurality of second magnetic bridges 16 are symmetrically distributed about the rotation center of the rotor core 1, and the plurality of second magnetic bridges 16 are radially distributed about the rotation center of the rotor core 1. Both sides of the second magnetic bridge 16 are at least partial side walls of two second magnetic slots 12 respectively.

[0082] It can be understood that the second magnetic bridge 16 is a structural support member and a connecting member for forming the second magnetic slot 12. Through the second magnetic bridge 16, the stable formation of two second magnetic slots 12 can be realized, so that the rotor core 1 and the entire rotor assembly 100 maintain a high mechanical structural strength, and the second permanent magnet 3 can be firmly arranged in the second magnetic slot 12.

[0083] It can be understood that two second permanent magnets 3 are arranged between every two adjacent first permanent magnets 2, and a second magnetic bridge 16 is arranged between two adjacent second magnetic slots 12, that is, a second magnetic bridge 16 is formed between every two adjacent second permanent magnets 3 to ensure the overall structural strength of the rotor core 1.

[0084] In one embodiment, as Figure 5 shown, the magnetic barrier structure 13 is arranged at one end of the second permanent magnet 3 facing the first permanent magnet 2; two magnetic barrier structures 13 adjacent to the same first permanent magnet 2 are communicated with each other, and part of the first permanent magnet 2 extends into the magnetic barrier structure 13.

[0085] In this embodiment, a second permanent magnet 3 is arranged on each side of the same first permanent magnet 2, and the two second magnetic slots 12 for arranging the two second permanent magnets 3 are communicated with each other. The two second permanent magnets 3 respectively occupy part of the space of the second magnetic slots 12 where they are located, and a part of the space between the two second permanent magnets 3 is left. The remaining part of the space is the magnetic barrier structure 13, and the magnetic barrier structures 13 formed by the two second permanent magnets 3 are communicated with each other. At the same time, the magnetic barrier structure 13 is also communicated with the first magnetic slot 11, so that one end of the first permanent magnet 2 located therebetween facing the rotor core 1 extends into the magnetic barrier structure 13.

[0086] It can be understood that on the basis that magnetic barrier structures 13 are respectively formed on both sides of the second magnetic bridge 16 and the second permanent magnet 3, a magnetic barrier structure 13 is also formed at one end of the second permanent magnet 3 adjacent to the first permanent magnet 2, and the two magnetic barrier structures 13 adjacent to the same first permanent magnet 2 communicate with each other to form a magnetic isolation groove 17. Through the magnetic isolation groove 17, a cavity can be formed between the first permanent magnet 2 and the two second permanent magnets 3 adjacent to the first permanent magnet 2, thereby preventing a closed magnetic circuit from being generated between the first permanent magnet 2 and the two adjacent second permanent magnets 3 and effectively preventing magnetic leakage.

[0087] In one embodiment, as Figure 6 shown, the rotor core 1 is further provided with a magnetic isolation groove 17. The magnetic isolation groove 17 is provided at one end of the second permanent magnet 3 adjacent to the second magnetic bridge 16, and the side wall of the second magnetic bridge 16 and the side wall of the adjacent second permanent magnet 3 form the magnetic isolation groove 17.

[0088] It can be understood that since the second magnetic bridge 16 will generate a small amount of closed magnetic circuits between the two adjacent second permanent magnets 3, a magnetic isolation groove 17 is formed at one end of each second magnetic groove 12 adjacent to the second magnetic bridge 16, that is, at least part of the common side wall of each second magnetic bridge 16 and each adjacent second magnetic groove 12 and the side wall of the end of the second permanent magnet 3 enclose to form the magnetic isolation groove 17. The magnetic isolation groove 17 can reduce the magnetic leakage caused by the setting of the second magnetic bridge 16 to reduce the short-circuit magnetic flux between the two second permanent magnets 3 and improve the performance of the motor.

[0089] In one embodiment, part of the plurality of second magnetic bridges 16 forms a broken groove, and the broken groove communicates with two adjacent second magnetic grooves 12, and the broken groove is filled with air or a poor magnetic conductive material.

[0090] It can be understood that the broken groove is provided on the second magnetic bridge 16. The broken groove extends from the first magnetic groove 11 to the second magnetic groove 12 and communicates with the first magnetic groove 11 and the second magnetic groove 12. When a magnetic barrier structure 13 is provided at the end of the second permanent magnet 3, the broken groove also communicates with the magnetic barrier structure 13. By providing the broken groove, on the basis that the remaining structure of the second magnetic bridge 16, that is, the second magnetic bridge 16 structures on both sides of the broken groove wall, still has a certain structural strength, it is ensured that the overall rotor core 1 has a certain structural strength, and the magnetic leakage between the first permanent magnet 2 and the second permanent magnet 3 on both sides of the second magnetic bridge 16 can also be reduced by filling air or a poor magnetic conductive material in the broken groove, further improving the magnetic concentrating ability of the first permanent magnet 2 and the second permanent magnet 3 and increasing the effective magnetic flux linked with the stator. Among them, the poor magnetic conductive material can be a non-metal material, such as a polymer material, etc., which is not limited here.

[0091] In one embodiment, the maximum magnetic energy product of the first permanent magnet 2 is greater than the maximum magnetic energy product of the second permanent magnet 3; the material of the first permanent magnet 2 is a rare earth permanent magnet.

[0092] In this embodiment, the materials of the first permanent magnet 2 and the second permanent magnet 3 are different. The first permanent magnet 2 is set as a rare earth permanent magnet, such as neodymium iron boron permanent magnet material, and the second permanent magnet 3 is set as a permanent magnet material with a maximum magnetic energy product less than that of the first permanent magnet 2, such as ferrite material.

[0093] It can be understood that the maximum magnetic energy product, as an important parameter for measuring the magnetic performance of a permanent magnet, refers to the maximum value of the product of the magnetic induction intensity and the magnetic field intensity on the demagnetization curve of the permanent magnet material. Generally, the larger the maximum magnetic energy product, the stronger the magnetic performance of the permanent magnet material. Setting the first permanent magnet 2 as a rare earth permanent magnet material with a larger maximum magnetic energy product can ensure that the rotor assembly 100 has a stronger magnetic field density, and the motor with the rotor assembly 100 also has better performance. Using the second permanent magnet 3 with a maximum magnetic energy product less than that of the first permanent magnet 2 can also reduce the use of rare earth materials, lower the cost of the rotor assembly 100, and thus reduce the material cost of the motor.

[0094] At the same time, since the magnetic performance of the second permanent magnet 3 is poorer than that of the first permanent magnet 2, the second permanent magnet 3 is less affected by the demagnetizing magnetic field, which can improve the demagnetization resistance of the rotor assembly 100, reduce the magnetic leakage of the rotor assembly 100, and improve the torque performance of the motor with the rotor assembly 100.

[0095] In one embodiment, as Figure 1 shown, the magnetization direction of the first permanent magnet 2 is the same as its width direction; the magnetic polarities of the opposite sides of two adjacent first permanent magnets 2 are the same.

[0096] In this embodiment, the first permanent magnet 2 has a long strip structure. The length direction of the first permanent magnet 2 is defined as the direction extending from the axis adjacent to the rotor core 1 towards the edge of the rotor core 1, and the direction perpendicular to the length direction of the first permanent magnet 2 is the width direction of the first permanent magnet 2, which is also the tangential direction along the rotor core 1. At the same time, the first permanent magnet 2 is magnetized along its width direction.

[0097] It can be understood that by arranging the two magnetic poles of the first permanent magnet 2 on both circumferential sides of the first permanent magnet 2 along the rotor core 1, it is ensured that the opposite sides of two adjacent first permanent magnets 2 have the same magnetic polarity, and a magnetic pole region 4 with a unified magnetic polarity is formed between the two first permanent magnets 2. Further, in combination with the multiple first permanent magnets 2 being centrosymmetrically distributed around the axis of the rotor core 1, two magnetic pole regions 4 with different polarities are formed on both sides of the same first permanent magnet 2. That is, the magnetization direction of the first first permanent magnet 2 among two adjacent first permanent magnets 2 is from itself to the other first permanent magnet 2 along the width direction, and the magnetization direction of the second first permanent magnet 2 is from itself to the other first permanent magnet 2 along the width direction, thereby forming an alternating arrangement of S poles and N poles in the rotor assembly 100.

[0098] In one embodiment, as Figure 1 shown, the magnetization direction of the second permanent magnet 3 is the same as its width direction; the magnetic polarity of the side of the second permanent magnet 3 facing the edge direction of the rotor core 1 is the same as the magnetic polarity of the opposite sides of two adjacent first permanent magnets 2.

[0099] In this embodiment, the second permanent magnet 3 has a tile-shaped structure, and the arc of the tile protrudes from the center of the rotor core 1 towards the edge direction of the rotor core 1. The length direction of the second permanent magnet 3 is defined as the direction extending along the circumference of the center of the rotor core 1, and the direction perpendicular to the length direction of the second permanent magnet 3 is the width direction of the second permanent magnet 3, and this width direction is also the radial direction of the rotor core 1. At the same time, the first permanent magnet 2 is magnetized along the width direction of the second permanent magnet 3.

[0100] It can be understood that for at least one second permanent magnet 3 between two adjacent first permanent magnets 2, their magnetization directions are the same, both 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 4 with a unified magnetic polarity is formed between two adjacent first permanent magnets 2 and at least one second permanent magnet 3 located therebetween. When the magnetization directions of two adjacent first permanent magnets 2 are towards the magnetic pole region 4 along the width direction of the first permanent magnet 2, the magnetization direction of at least one second permanent magnet 3 located therebetween is also set towards the magnetic pole region 4 along the width direction of the second permanent magnet 3 and towards the edge of the rotor core 1; similarly, when the magnetization directions of two adjacent first permanent magnets 2 are away from the magnetic pole region 4 along the width direction of the first permanent magnet 2, the magnetization direction of at least one second permanent magnet 3 located therebetween is also set away from the magnetic pole region 4 along the width direction of the second permanent magnet 3 and towards the center of the rotor core 1, thereby enabling the multiple magnetic pole regions 4 formed by the first permanent magnet 2 and the second permanent magnet 3 to have a better magnetic focusing effect and form a structure with an alternating arrangement of S poles and N poles.

[0101] The present utility model further provides a motor, which comprises a stator assembly and the aforementioned rotor assembly 100. The stator assembly includes a stator core and coils wound around the stator core. The rotor assembly 100 is disposed in the center of the stator assembly, and an air gap is formed between the rotor assembly 100 and the stator assembly. For the specific structure of the rotor assembly 100, reference may be made to the foregoing embodiments. Since this motor adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0102] The present utility model further provides an electrical equipment, which comprises the aforementioned motor. For the specific structure of this motor, reference may be made to the foregoing embodiments. Since this electrical equipment adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought about by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one. Among them, the electrical equipment may be a compressor having the aforementioned motor, as well as an air conditioner, a washing machine, a refrigeration equipment, a new energy vehicle, an electric bicycle, etc. having a compressor.

[0103] The above are only exemplary embodiments of the present utility model, and do not limit the patent scope of the present utility model accordingly. Any equivalent structural transformation made by using the content of the specification and drawings of the present utility model under the technical concept 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, wherein the rotor core is provided with a magnetic barrier structure; and A permanent magnet assembly, the permanent magnet assembly is arranged on the rotor core, the permanent magnet assembly comprises a first permanent magnet and a second permanent magnet, and the magnetic barrier structure is located between adjacent first permanent magnets and second permanent magnets; The first permanent magnet and the second permanent magnet are made of different materials.

2. The rotor assembly according to claim 1, characterized in that The magnetic barrier structure is along the axial direction of the rotor core, and the magnetic barrier structure penetrates at least a portion of the rotor core.

3. The rotor assembly according to claim 2, characterized in that The rotor core includes a plurality of first magnetic bridges, and the permanent magnet assembly includes a plurality of the first permanent magnets and a plurality of the second permanent magnets; Each of the first magnetic bridges is disposed between adjacent first permanent magnets and second permanent magnets.

4. The rotor assembly according to claim 3, characterized in that: A second permanent magnet is disposed between two adjacent first permanent magnets; The magnetic barrier structure is arranged at two ends of the second permanent magnet along the circumferential direction of the rotor core, and the ends of the second permanent magnet and the side walls of the first magnetic bridge are enclosed to form the magnetic barrier structure.

5. The rotor assembly according to claim 4, characterized in that The side wall of the first permanent magnet along the circumference of the rotor core and the side wall of the adjacent second permanent magnet along the circumference of the rotor core are arranged at an angle.

6. The rotor assembly according to claim 5, characterized in that The angle is less than or equal to 180° / P, where P is the number of poles of the rotor assembly.

7. The rotor assembly according to claim 3, characterized in that: Two second permanent magnets are arranged between two adjacent first permanent magnets; The rotor core is further provided with a magnetic isolation groove, and the magnetic isolation groove is located between two adjacent second permanent magnets.

8. The rotor assembly according to claim 3, characterized in that: Some of the first magnetic bridges form broken slots; The rotor core is provided with a plurality of first magnetic slots and a plurality of second magnetic slots, each of the first permanent magnets is arranged in one of the first magnetic slots, and each of the second permanent magnets is arranged in one of the second magnetic slots; The broken groove connects the first magnetic groove and the second magnetic groove, and the broken groove is filled with air or poor magnetic conductive material.

9. The rotor assembly according to claim 8, characterized in that The rotor core is further provided with a magnetic isolation hole, which is provided at one end of the first permanent magnet facing the axis of the rotor core, and the magnetic isolation hole is connected to the first magnetic slot.

10. The rotor assembly according to claim 2, wherein: Two second permanent magnets are arranged between two adjacent first permanent magnets; The rotor core includes a plurality of second magnetic bridges, and one second magnetic bridge is formed between every two adjacent second permanent magnets.

11. The rotor assembly according to claim 10, wherein: The magnetic barrier structure is arranged at one end of the second permanent magnet facing the first permanent magnet; The two magnetic barrier structures adjacent to the same first permanent magnet are connected to each other, and part of the first permanent magnet extends into the magnetic barrier structure.

12. The rotor assembly according to claim 11, wherein: The rotor core is further provided with a magnetic isolation groove, which is provided at one end of the second permanent magnet adjacent to the second magnetic bridge, and the side wall of the second magnetic bridge and the side wall of the adjacent second permanent magnet form the magnetic isolation groove.

13. The rotor assembly according to claim 10, wherein: Some of the plurality of second magnetic bridges form broken slots; The rotor core is provided with a plurality of first magnetic slots and a plurality of second magnetic slots, each of the first permanent magnets is arranged in one of the first magnetic slots, and each of the second permanent magnets is arranged in one of the second magnetic slots; The broken groove connects the first magnetic groove and the second magnetic groove, and the broken groove is filled with air or poor magnetic conductive material.

14. The rotor assembly according to any one of claims 1 to 13, characterized in that: The maximum magnetic energy product of the first permanent magnet is greater than the maximum magnetic energy product of the second permanent magnet; The material of the first permanent magnet is rare earth permanent magnet.

15. The rotor assembly according to any one of claims 1 to 13, 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 two adjacent first permanent magnets 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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