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 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 second permanent magnets are positioned between two adjacent first permanent magnets; the magnetic barrier structure is located between two adjacent first permanent magnets and is located on one side, facing the edge of the rotor core, of the second permanent magnet. The utility model aims to inhibit quadrature-axis armature reaction 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, 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. In permanent magnet motors, there is usually armature reaction, which is the influence of the magnetic field on the stator side on the rotor side.

[0003] In an existing permanent magnet motor, there is a large-area iron core structure inside the rotor structure except for the installed permanent magnets. When the armature reaction of the permanent magnet motor is large, it will directly pass through the iron core structure, affecting the magnetic field distribution of the rotor structure, reducing the overload capacity of the motor under large loads, and degrading the motor performance. Summary of the Utility Model

[0004] The main object of the utility model is to propose a rotor assembly, a motor and an electrical equipment, aiming to suppress the armature reaction through the rotor assembly and improve the motor performance.

[0005] To achieve the above object, the utility model proposes a rotor assembly, which comprises:

[0006] A rotor iron core provided with a magnetic barrier structure; and

[0007] A permanent magnet assembly disposed on the rotor iron core, the permanent magnet assembly comprising a first permanent magnet and a second permanent magnet, and the second permanent magnet being located between two adjacent first permanent magnets;

[0008] The magnetic barrier structure is located between two adjacent first permanent magnets and on the side of the second permanent magnet facing the edge of the rotor iron core.

[0009] In one embodiment, the magnetic barrier structure penetrates at least part of the rotor iron core along the axial direction of the rotor iron core.

[0010] In one embodiment, the magnetic barrier structure extends from the first permanent magnet or the second permanent magnet towards the edge of the rotor iron core.

[0011] In one embodiment, two adjacent first permanent magnets and the second permanent magnet located therebetween enclose a magnetic pole region, the rotor iron core is provided with a plurality of the magnetic pole regions, and each magnetic pole region is provided with at least one magnetic barrier structure.

[0012] In one embodiment, each of the magnetic pole regions includes two of the magnetic barrier structures, and the distance between the two magnetic barrier structures is gradually decreased from adjacent to the center of the rotor core to adjacent to the edge of the rotor core.

[0013] In one embodiment, at least one of the magnetic barrier structures extends from the second permanent magnet toward the edge of the rotor core;

[0014] and / or, at least one of the magnetic barrier structures extends from one of the first permanent magnets toward the edge of the rotor core.

[0015] In one embodiment, define the maximum distance from the axis of the rotor core to the magnetic barrier structure as Rmax, and define the minimum distance from the axis of the rotor core to the magnetic barrier structure as Rmin;

[0016] The difference between the Rmax and the Rmin is greater than 2 mm.

[0017] In one embodiment, the magnetic barrier structure includes at least two magnetic barrier units, and the at least two magnetic barrier units are spaced along the direction from the first permanent magnet or the second permanent magnet to the edge of the rotor core.

[0018] In one embodiment, along the axial direction of the rotor core, the circumferential width of the cross section of the magnetic barrier structure is gradually increased from the first permanent magnet or the second permanent magnet to the edge of the rotor core.

[0019] In one embodiment, along the axial direction of the rotor core, the circumferential width of the cross section of the magnetic barrier structure is equal-width from the first permanent magnet or the second permanent magnet to the edge of the rotor core, and the width is between 0.2 mm and 5 mm.

[0020] In one embodiment, the magnetic barrier structure extends linearly or curvilinearly from the first permanent magnet or the second permanent magnet toward the edge of the rotor core.

[0021] In one embodiment, the maximum magnetic energy product of the first permanent magnet is greater than the maximum magnetic energy product of the second permanent magnet;

[0022] The material of the first permanent magnet is rare earth permanent magnet.

[0023] In one embodiment, the magnetization direction of the first permanent magnet is the same as its width direction;

[0024] The magnetic polarities of the opposite sides of two adjacent first permanent magnets are the same.

[0025] In one embodiment, the magnetization direction of the second permanent magnet is the same as its width direction;

[0026] The magnetic polarity of one side of the second permanent magnet facing the edge direction of the rotor core is the same as the magnetic polarity of the opposite sides of the two adjacent first permanent magnets.

[0027] The present utility model further provides a motor, including the above-mentioned rotor assembly.

[0028] The rotor assembly of the present utility model includes a rotor core and a permanent magnet assembly. The permanent magnet assembly includes first permanent magnets and a second permanent magnet. The second permanent magnet is located between two adjacent first permanent magnets. The rotor core is provided with a magnetic barrier structure, which is located between two adjacent first permanent magnets and on the side of the second permanent magnet facing the edge of the rotor core. By setting the magnetic barrier structure, the cross-axis armature reaction can be effectively suppressed to improve the torque and performance of the motor. Description of the Drawings

[0029] 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 also be obtained based on the structures shown in these drawings.

[0030] Figure 1 It is a schematic structural diagram of the rotor assembly in an embodiment of the present utility model;

[0031] Figure 2 It is a schematic structural diagram of the rotor assembly in another embodiment of the present utility model;

[0032] Figure 3 It is a schematic structural diagram of the rotor assembly in yet another embodiment of the present utility model;

[0033] Figure 4 It is a schematic structural diagram of the rotor assembly in still another embodiment of the present utility model;

[0034] Figure 5 It is a schematic structural diagram of the rotor assembly in still another embodiment of the present utility model.

[0035] Explanation of the Reference Numerals in the Drawings:

[0036] 100, rotor assembly; 1, rotor core; 11, magnetic barrier structure; 111, magnetic barrier unit; 2, first permanent magnet; 3, second permanent magnet; 4, magnetic pole region; 41, magnetic path channel.

[0037] The realization, functional features and advantages of the object of the present utility model will be further described with reference to the embodiments and the drawings. Detailed Embodiments

[0038] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with 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 belong to the scope of protection of the present utility model.

[0039] 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.

[0040] In addition, if there are descriptions such as "first", "second", etc. involved 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 that satisfies both A and B at the same time. 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.

[0041] Please refer to Figures 1 to 5 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 is provided with a magnetic barrier structure. The permanent magnet assembly is disposed on the rotor core. The permanent magnet assembly includes a first permanent magnet and a second permanent magnet. The second permanent magnet is located between two adjacent first permanent magnets; the magnetic barrier structure is located between two adjacent first permanent magnets and on the side of the second permanent magnet facing the edge of the rotor core.

[0042] In this embodiment, the permanent magnet assembly includes a plurality of first permanent magnets 2 and a plurality of second permanent magnets 3. The rotor core 1 is provided with a magnetic barrier structure 11. The plurality of first permanent magnets 2 are symmetrically arranged about the rotation center of the rotor core 1 on the rotor core 1. The plurality of second permanent magnets 3 are symmetrically arranged about the rotation center of the rotor core 1 on the rotor core 1. The second permanent magnet 3 is located between two adjacent first permanent magnets 2; the magnetic barrier structure 11 is located between two adjacent first permanent magnets 2 and on the side of the second permanent magnet 3 facing the edge of the rotor core 1.

[0043] In this embodiment, the rotor core 1 includes a plurality of rotor laminations stacked axially. The rotor laminations are silicon steel sheets and are circular in shape, so that the outer surface of the formed rotor core 1 is in a cylindrical structure. Along the rotation axis direction of the rotor core 1, a first cavity and a second cavity are provided through each rotor lamination, so that the first cavity and the second cavity penetrate the entire rotor core 1 along the rotation axis of the rotor core 1. Among them, the plurality of first cavities and the plurality of second cavities are centrally symmetrically arranged around the rotation center of the rotor core 1, that is, the plurality of first cavities and the plurality of second cavities are evenly distributed in the circumferential direction around the rotation center of the rotor core 1, and at least one second cavity is located between two adjacent first cavities, such as one or two.

[0044] Furthermore, the rotor assembly 100 further includes a plurality of first permanent magnets 2 and a plurality of second permanent magnets 3. Each first permanent magnet 2 is disposed in a first cavity, and each second permanent magnet 3 is disposed in a second cavity, so that the plurality of first permanent magnets 2 and the plurality of second permanent magnets 3 are centrally symmetrically arranged around the rotation center of the rotor core 1, and at least one second permanent magnet 3 is provided between two adjacent first permanent magnets 2.

[0045] It can be understood that the plurality of first permanent magnets 2 and the plurality of second permanent magnets 3 are respectively embedded in the rotor core 1 through the first cavity and the second cavity. Therefore, compared with the surface-mounted alternating-pole permanent magnet motor in the related art, the magnetic flux 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.

[0046] In this embodiment, the rotor core 1 is formed with a magnetic barrier structure 11. The magnetic barrier structure 11 is a cavity structure that penetrates the rotor core 1 along the axis direction of the rotor core 1. The magnetic barrier structure 11 is located between two first permanent magnets 2 and in the area on the side of the second permanent magnet 3 facing the edge of the rotor core 1. The magnetic barrier structure 11 is a cavity structure formed inside the rotor core 1, that is, two first permanent magnets 2 and at least one second permanent magnet 3 located between them enclose a magnetic pole region 4 with a single opening. The magnetic pole region 4 is linked with the stator assembly through the magnetic flux generated by the first permanent magnet 2 and the second permanent magnet 3 to realize the rotation of the rotor assembly 100 relative to the stator assembly. The magnetic barrier structure 11 is disposed in the magnetic pole region 4.

[0047] It can be understood that in a permanent magnet synchronous motor, the rotor assembly 100 itself is equivalent to a multi-pole magnet. When the rotor assembly 100 rotates relative to the stator assembly, a main magnetic field is formed in the air gap between the rotor assembly 100 and the stator assembly. The magnetic field formed by passing current through the stator assembly is the armature magnetic field, and the influence of the armature magnetic field on the main magnetic field is the armature reaction. When the influence of the armature magnetic field on the main magnetic field of the rotor assembly 100 is large, it will not only change the distribution of the magnetic flux density of the magnetic field on the rotor assembly 100, resulting in a decrease in performance when linking with the stator assembly, but also cause the problem of deepening magnetic saturation of the rotor assembly 100, unable to output sufficient overload torque, so it cannot bear a large load of the motor, and the performance of the motor with the rotor assembly 100 decreases.

[0048] Based on the above problems, in the present application, a magnetic barrier structure 11 is arranged in the magnetic pole region 4 formed between the first permanent magnet 2 and the second permanent magnet 3. The magnetic barrier structure 11 with a cavity structure can block part of the armature magnetic field entering the magnetic pole region 4 of the rotor assembly 100 from the stator assembly, thereby reducing the influence of the armature magnetic field on the main magnetic field formed by the rotor assembly 100, and improving the performance of the rotor assembly 100 and the motor with the rotor assembly 100 under a large load.

[0049] In an embodiment, the magnetic barrier structure 11 penetrates at least part of the rotor core 1 along the axis direction of the rotor core 1. It can be understood that the magnetic barrier structure 11 is a cavity structure, which can be a through hole penetrating the rotor core 1 along the axis direction of the rotor core 1, or a groove structure penetrating part of the rotor core 1 along the axis direction of the rotor core 1. The cross-section of the magnetic barrier structure 11 along the axis 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 here.

[0050] In an embodiment, as Figures 1 to 5 shown, the magnetic barrier structure 11 extends from the first permanent magnet 2 or the second permanent magnet 3 towards the edge of the rotor core 1.

[0051] In this embodiment, the magnetic barrier structure 11 is arranged in the magnetic pole region 4 formed by enclosing between two adjacent first permanent magnets 2 and the second permanent magnet 3, and the magnetic barrier structure 11 extends in a long strip shape along a straight line or a curve. The magnetic barrier structure 11 extends from the first permanent magnet 2 or the second permanent magnet 3 towards the edge direction of the rotor core 1, so as to divide the magnetic pole region 4 into at least two magnetic path channels 41 through at least one magnetic barrier structure 11, and the magnetic path channel 41 also extends from the first permanent magnet 2 or the second permanent magnet 3 towards the edge of the rotor core 1.

[0052] It can be understood that the setting of the magnetic barrier structure 11 can, on the one hand, isolate the closed magnetic circuit generated between the adjacent first permanent magnet 2 and the second permanent magnet 3, reduce the magnetic leakage between the first permanent magnet 2 and the second permanent magnet 3, and ensure the performance of the rotor assembly 100 and the performance of the motor with the rotor assembly 100. At the same time, taking the setting of two magnetic barrier structures 11 as an example, the two extended magnetic barrier structures 11 form three magnetic path channels 41. The magnetic path channels 41 formed by the magnetic barrier structure 11 enable the reverse magnetic flux to be guided by the magnetic path channels 41 formed by the adjacent two magnetic barrier structures 11 and avoid the first permanent magnet 2 and the second permanent magnet 3 when the demagnetizing current generates an excessive reverse magnetic field, so as to reduce the influence of the reverse magnetic field on the first permanent magnet 2 and the second permanent magnet 3, thereby achieving the effect of improving the demagnetization resistance performance, avoiding the risk of demagnetization of the first permanent magnet 2 and the second permanent magnet 3 during the operation of the permanent magnet motor, and improving the use stability of the motor.

[0053] In one embodiment, as Figures 1 to 5 shown, two adjacent first permanent magnets 2 and the second permanent magnet 3 located therebetween enclose a magnetic pole region 4, and the rotor core 1 is provided with at least one magnetic barrier structure 11 in each magnetic pole region 4.

[0054] In this embodiment, the magnetic pole region 4 is enclosed by two adjacent first permanent magnets 2 and the second permanent magnet 3 located therebetween. The two first permanent magnets 2 are axially symmetrically arranged about a radius of the rotor core 1, and this radius is defined as the axis of symmetry. Therefore, the magnetic pole region 4 is also axially symmetrically distributed about the axis of symmetry. One magnetic barrier structure 11 can be arranged in each magnetic pole region 4 of the rotor core 1, and to ensure the uniform mass distribution of the entire rotor core 1, multiple magnetic barrier structures 11 are all distributed along the radial direction of the rotor core 1, and multiple magnetic barrier structures 11 are radially distributed with the axis of the rotor core 1 as the center; at the same time, two or more magnetic barrier structures 11 are arranged in each magnetic pole region 4 of the rotor core 1. When the number of magnetic barrier structures 11 is even, multiple magnetic barrier structures 11 are axially symmetrically distributed about the axis of symmetry; when the number of magnetic barrier structures 11 is odd, one magnetic barrier structure 11 extends along the axis of symmetry to the edge of the rotor core 1, and the remaining multiple magnetic barrier structures 11 are axially symmetrically distributed about this axis of symmetry.

[0055] It can be understood that the multiple magnetic barrier structures 11 arranged in the multiple magnetic pole regions 4 are still centered on the axis of the rotor core 1 and are centrosymmetrically distributed. Therefore, it can ensure the uniform mass distribution and stable torque of the entire rotor assembly 100, and different numbers of magnetic barrier structures 11 are selected according to the different sizes of the rotor assembly 100 and the magnetic energy product of the first permanent magnet 2 and the second permanent magnet 3. For example, if the overall structural size of the rotor assembly 100 and the supporting stator assembly is relatively small, the number of magnetic barrier structures 11 can be reduced to reduce the hindrance of the magnetic barrier structures 11 to the main magnetic flux and improve the output torque of the motor.

[0056] In one embodiment, as Figures 2 to 5 shown, each magnetic pole region 4 includes two magnetic barrier structures 11, and the distance between the two magnetic barrier structures 11 is gradually decreased from the center adjacent to the rotor core 1 to the edge adjacent to the rotor core 1.

[0057] It can be understood that two magnetic barrier structures 11 are arranged in each magnetic pole region 4, and the two magnetic barrier structures 11 are axially symmetrically distributed about the axis of symmetry. The two magnetic barrier structures 11 both extend from the center of the rotor core 1 to the edge of the rotor core 1. On the one hand, the influence of the quadrature axis armature reaction can be suppressed by the magnetic barrier structures 11. On the other hand, the two magnetic barrier structures 11 also form three magnetic path channels 41. The two magnetic flux channels on both sides are mainly used to conduct the magnetic flux generated by the first permanent magnet 2, and the one magnetic path channel 41 in the middle is mainly used to conduct the magnetic flux generated by the second permanent magnet 3. Therefore, the sinusoidality of the air-gap magnetic field can also be improved by reasonable magnetic flux distribution, and the vibration and noise of the motor can be reduced.

[0058] In one embodiment, as Figures 1 to 5 shown, at least one of the magnetic barrier structures 11 extends from the second permanent magnet 3 to the edge of the rotor core 1; optionally, at least one of the magnetic barrier structures 11 extends from one of the first permanent magnets 2 to the edge of the rotor core 1. It can be understood that if at least one magnetic barrier structure 11 simultaneously extends from adjacent to the second permanent magnet 3 towards the edge of the rotor core 1, the area of the magnetic path channel 41 formed on the adjacent two sides will be larger, so that more magnetic flux of the first permanent magnet 2 passes through the magnetic path channels 41 on both sides. If at least one magnetic barrier structure 11 simultaneously extends from one of the adjacent first permanent magnets 2 towards the edge of the rotor core 1, the area of the magnetic path channels 41 on both sides will be reduced, and the area of the central magnetic path channel 41 will be larger, so as to increase the magnetic flux of the second permanent magnet 3 entering the central magnetic path channel 41. Accordingly, by guiding the magnetic flux directions of the first permanent magnet 2 and the second permanent magnet 3, the magnetic path density of the rotor assembly 100 in each magnetic pole region 4 can be flexibly adjusted, so that the distribution of the rotor magnetic flux density can be better regulated, the harmonic content of the air-gap magnetic density waveform can be reduced, and the sinusoidality of the back electromotive force waveform can be improved, thereby improving the operating stability of the rotor assembly 100 and the motor having the rotor assembly 100, and improving the load capacity.

[0059] In one embodiment, as Figure 1 , Figure 3 and Figure 4 shown, define the maximum distance from the axis of the rotor core 1 to the magnetic barrier structure 11 as Rmax, and define the minimum distance from the axis of the rotor core 1 to the magnetic barrier structure 11 as Rmin; the difference between Rmax and Rmin is greater than 2 mm.

[0060] In this embodiment, it extends from the center of the rotor core 1 to each point at the edge of the magnetic barrier structure 11 to obtain the maximum distance Rmax from the axis of the rotor core 1 to the magnetic barrier structure 11 and the minimum distance Rmin from the axis of the rotor core 1 to the magnetic barrier structure 11. The difference between Rmax and Rmin is greater than 2 mm, that is, along the direction from the axis of the rotor core 1 to the edge of the rotor core 1 and in the radial direction of the rotor core 1, the minimum extension span of the magnetic barrier structure 11 should be greater than 2 mm.

[0061] It can be understood that by limiting the minimum extension span of the magnetic barrier structure 11 in the radial direction of the rotor core 1, it can ensure that the magnetic barrier structure 11 effectively blocks the armature magnetic field entering from the stator assembly into the rotor assembly 100, thereby effectively suppressing the cross-axis armature reaction. Based on the minimum size of the permanent magnet motor rotor core 1, the minimum span is usually set to be greater than or equal to 2 mm, and for rotor cores 1 of different sizes, magnetic barrier structures 11 with different span sizes are set, so that rotor assemblies 100 of different sizes can effectively block the armature magnetic fields generated by corresponding-sized stator assemblies. At the same time, the corresponding magnetic barrier structure 11 size can also reduce the harmonic content of the air-gap magnetic density waveform and improve the sinusoidality of the back electromotive force waveform, effectively improving the stability of the motor during operation, reducing working noise, and enhancing the motor performance.

[0062] In one embodiment, as Figure 4 shown, the magnetic barrier structure 11 includes at least two magnetic barrier units 111, and the at least two magnetic barrier units 111 are spaced along the direction from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1.

[0063] In this embodiment, each magnetic barrier structure 11 includes at least two magnetic barrier units 111. Each magnetic barrier unit 111 also extends from adjacent to the center of the rotor core 1 to adjacent to the edge of the rotor core 1, or each magnetic barrier unit 111 extends along the circumferential direction of the rotor core 1, which is not limited here. And the at least two magnetic barrier units 111 are spaced along the direction from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1.

[0064] It can be understood that by splitting a complete magnetic barrier structure 11 into at least two magnetic barrier units 111, the layout of the magnetic path channels 41 in the pole region 4 can be further optimized. A magnetic path channel 41 is formed between every two adjacent magnetic barrier units 111. The magnetic fluxes of the first permanent magnet 2 and the second permanent magnet 3 are evenly guided through the multiple magnetic path channels 41, so that the magnetic density inside the rotor core 1 will not be too concentrated and there will be no place with too high magnetic density, optimizing the magnetic density distribution, improving the magnetic density distribution under each pole of the rotor core 1, reducing the harmonic content of the magnetic density in the air gap between the stator and the rotor, improving the sinusoidality of the back electromotive force waveform, enhancing the stability of the motor operation and the maximum load; at the same time, it provides a leakage channel for the demagnetizing magnetic field generated by the stator, and can improve the anti-demagnetization ability of the rotor.

[0065] In one embodiment, as Figure 3 shown, along the axial direction of the rotor core 1, the circumferential width of the cross-section of the magnetic barrier structure 11 gradually increases from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1.

[0066] It can be understood that along the axial direction of the rotor core 1, the cross-sectional shape of the magnetic barrier structure 11 can be oval, rectangular, triangular or arc-shaped. In a preferred embodiment, the cross-sectional shape is triangular, and the circumferential width of the magnetic barrier structure 11 gradually increases from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1. Wherein, the circumferential width of the magnetic barrier structure 11 is the width of the magnetic barrier structure 11 along the circumferential direction with the axis of the rotor core 1 as the center. Such a setting makes the width of the magnetic barrier structure 11 larger at the edge of the rotor core 1 and greater than the width of the magnetic barrier structure 11 at the center of the rotor core 1, so that the magnetic barrier structure 11 can block more armature magnetic fields generated by the stator assembly, enhancing the inhibitory effect of the magnetic barrier structure 11 on the cross-axis armature reaction, thereby ensuring the large load capacity of the rotor assembly 100 and the motor having the rotor assembly 100; at the same time, it provides a leakage channel for the demagnetizing magnetic field generated by the stator, which can improve the demagnetization resistance of the rotor.

[0067] In one embodiment, as Figure 1 , Figure 2 , Figure 4 and Figure 5 shown, along the axial direction of the rotor core 1, the circumferential width of the cross-section of the magnetic barrier structure 11 is equal from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1, and the width is between 0.2 mm and 5 mm.

[0068] It can be understood that the circumferential width of the magnetic barrier structure 11 is the width of the magnetic barrier structure 11 along the circumferential direction with the axis of the rotor core 1 as the center. The circumferential width of the magnetic barrier structure 11 is equal from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1, that is, the cross-section of the magnetic barrier structure 11 along the axial direction of the rotor core 1 is rectangular, and the width is between 0.2 mm and 5 mm (including the values at both ends of 0.2 mm and 5 mm). According to different sizes of the rotor assembly 100 and the corresponding stator assembly, a magnetic barrier structure 11 with different widths can be selected, and the magnetic barrier structure 11 occupies a large space in the pole region 4 to ensure the inhibitory effect on the armature reaction.

[0069] In one embodiment, as Figures 1 to 5 shown, the magnetic barrier structure 11 extends linearly or curvilinearly from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1.

[0070] In this embodiment, during the process that the magnetic barrier structure 11 extends from the edge of the first permanent magnet 2 or the second permanent magnet 3 to the rotor core 1, it can extend linearly or in a curved arc. When the magnetic barrier structure 11 extends linearly, it can extend in the radial direction of the rotor core 1, so that a plurality of magnetic barrier structures 11 are arranged radially with respect to the axis of the rotor core 1, or it can be arranged at an angle with respect to the radial direction of the rotor core 1, and preferably extends to the edge of the rotor core 1 away from the first permanent magnet 2; when the magnetic barrier structure 11 extends in a curve, the arc of the magnetic barrier structure 11 bulges from the side facing the first permanent magnet 2 to the side facing the second permanent magnet 3.

[0071] It can be understood that when different permanent magnetic materials with different magnetic energy products are used in the rotor assembly 100, the overall magnetism of the rotor assembly 100 will also be different. And by superimposing the changing dimensions of the rotor assembly 100 and the stator assembly, the rotor assembly 100 and the stator magnetic barrier structure 11 extend linearly or in a curve from the first permanent magnet 2 or the second permanent magnet 3 to the edge of the rotor core 1 to adapt to the changes in size and magnetic energy.

[0072] In one embodiment, the maximum magnetic energy product of the first permanent magnet 2 is greater than that of the second permanent magnet 3; the material of the first permanent magnet 2 is a rare earth permanent magnet.

[0073] 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 magnetic material with a maximum magnetic energy product smaller than that of the first permanent magnet 2, such as ferrite material.

[0074] It can be understood that the maximum magnetic energy product, as an important parameter to measure 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 magnetic material. Generally, the larger the maximum magnetic energy product, the stronger the magnetic performance of the permanent magnetic material. Setting the first permanent magnet 2 as a rare earth permanent magnetic material with a relatively large maximum magnetic energy product can ensure that the rotor assembly 100 has a strong magnetic field density, and the motor with the rotor assembly 100 also has good performance. Using the second permanent magnet 3 with a maximum magnetic energy product smaller than that of the first permanent magnet 2 can also reduce the use of rare earth materials, reduce the cost of the rotor assembly 100, and thus reduce the material cost of the motor.

[0075] At the same time, since the magnetic performance of the second permanent magnet 3 is relatively poor compared with that of the first permanent magnet 2, the second permanent magnet 3 is relatively 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.

[0076] In one embodiment, such as Figure 1As 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.

[0077] 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 of 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, and this width direction 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.

[0078] It can be understood that by arranging the two magnetic poles of the first permanent magnet 2 on both sides of the first permanent magnet 2 along the circumferential direction of the rotor core 1, the magnetic polarities of the opposite sides of two adjacent first permanent magnets 2 can be guaranteed to be the same, and a magnetic pole region 4 with a unified magnetic polarity is formed between the two first permanent magnets 2. Further, combined with the fact that multiple first permanent magnets 2 are 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 along the width direction from itself to the other first permanent magnet 2, and the magnetization direction of the second first permanent magnet 2 is along the width direction from itself to the other first permanent magnet 2, so that S poles and N poles are alternately arranged in the rotor assembly 100.

[0079] 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 polarities of the opposite sides of two adjacent first permanent magnets 2.

[0080] In this embodiment, the second permanent magnet 3 has a tile shape, and the arc of the tile shape 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.

[0081] It can be understood that at least one second permanent magnet 3 between two adjacent first permanent magnets 2 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 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 magnetized towards the pole region 4 along the width direction of the first permanent magnet 2, at least one second permanent magnet 3 located therebetween is also magnetized towards the 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 magnetized away from the pole region 4 along the width direction of the first permanent magnet 2, at least one second permanent magnet 3 located therebetween is also magnetized away from the pole region 4 along the width direction of the second permanent magnet 3 and towards the center of the rotor core 1, so that the multiple pole regions 4 formed by the first permanent magnets 2 and the second permanent magnets 3 have a better magnetic focusing effect and form a structure in which S poles and N poles are alternately arranged.

[0082] The present utility model further provides an electric 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 disposed 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 electric motor adopts all the technical solutions of all the foregoing embodiments, it has at least all the beneficial effects brought by the technical solutions of the foregoing embodiments, which will not be elaborated herein one by one.

[0083] The present utility model further provides an electrical equipment, which includes the above-mentioned electric motor. The specific structure of the electric motor refers 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 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 above-mentioned electric motor, as well as an air conditioner, a washing machine, a refrigeration equipment, a new energy vehicle, and an electric bicycle having a compressor.

[0084] 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, 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 second permanent magnet is located between two adjacent first permanent magnets; The magnetic barrier structure is located between two adjacent first permanent magnets and on a side of the second permanent magnet facing the edge of the rotor core.

2. The rotor assembly according to claim 1, 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.

3. The rotor assembly according to claim 2, characterized in that The magnetic barrier structure is extended from the first permanent magnet or the second permanent magnet toward the edge of the rotor core.

4. The rotor assembly according to claim 2, characterized in that: Two adjacent first permanent magnets and the second permanent magnet located therebetween enclose a magnetic pole region, the rotor core is provided with a plurality of the magnetic pole regions, and each of the magnetic pole regions is provided with at least one magnetic barrier structure.

5. The rotor assembly according to claim 4, characterized in that Each of the magnetic pole regions includes two magnetic barrier structures, and the distance between the two magnetic barrier structures is gradually reduced from the center of the rotor core to the edge of the rotor core.

6. The rotor assembly according to claim 5, characterized in that At least one of the flux barrier structures extends from the second permanent magnet to an edge of the rotor core; And / or, at least one of the flux barrier structures extends from one of the first permanent magnets toward an edge of the rotor core.

7. The rotor assembly according to any one of claims 1 to 6, characterized in that: The maximum distance from the axis of the rotor core to the magnetic barrier structure is defined as Rmax, and the minimum distance from the axis of the rotor core to the magnetic barrier structure is defined as Rmin; The difference between the Rmax and the Rmin is greater than 2 mm.

8. The rotor assembly according to any one of claims 1 to 6, characterized in that: The magnetic barrier structure includes at least two magnetic barrier units, and the at least two magnetic barrier units are arranged at intervals along the direction from the first permanent magnet or the second permanent magnet to the edge of the rotor core.

9. The rotor assembly according to any one of claims 1 to 6, characterized in that: The magnetic barrier structure is arranged along the axis direction of the rotor core, and the circumferential width of the cross section thereof gradually increases from the first permanent magnet or the second permanent magnet to the edge of the rotor core.

10. The rotor assembly according to any one of claims 1 to 6, characterized in that: The magnetic barrier structure is arranged along the axis of the rotor core, and the circumferential width of the cross section thereof is arranged to be equal from the first permanent magnet or the second permanent magnet to the edge of the rotor core, and the width is between 0.2 mm and 5 mm.

11. The rotor assembly according to any one of claims 1 to 6, characterized in that: The magnetic barrier structure extends from the first permanent magnet or the second permanent magnet to the edge of the rotor core in a straight line or a curve.

12. The rotor assembly according to any one of claims 1 to 6, 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.

13. The rotor assembly according to any one of claims 1 to 6, 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.

14. The rotor assembly according to claim 13, 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.

15. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 14.

16. An electrical equipment, characterized in that: Comprising the motor as claimed in claim 15.

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