Rotor assembly, motor and electrical equipment

Abstract

The utility model discloses a rotor assembly, motor and electrical equipment, the rotor assembly comprises a rotor yoke part, a first permanent magnet, a second permanent magnet and a third permanent magnet, the first permanent magnet is arranged at the inner circumference of the rotor yoke part, along the radial direction of the rotor yoke part, one side of the first permanent magnet close to the rotation axis of the rotor yoke part is an S pole, and the other side of the first permanent magnet close to the rotation axis of the rotor yoke part is an S pole. One side, deviating from the rotating axis, of the first permanent magnet is an N pole; the second permanent magnets are arranged on the inner circumference of the rotor yoke part, the second permanent magnets and the first permanent magnets are arranged at intervals in the circumferential direction of the rotor yoke part, in the radial direction, the sides, close to the rotating axis of the rotor yoke part, of the second permanent magnets are N poles, and the sides, away from the rotating axis, of the second permanent magnets are S poles; the third permanent magnets are arranged on the inner periphery of the rotor yoke part and located between the first permanent magnets and the second permanent magnets, and the magnetizing direction of the third permanent magnets is from the first permanent magnets to the second permanent magnets. The rotor assembly provided by the utility model can reduce magnetic flux leakage and improve the utilization rate of the permanent magnets, thereby improving the performance of the motor.

Description

Technical Field

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

[0002] Permanent magnet motors have the advantages of simple structure, high power density, wide high efficiency area, high torque density, etc. They have become the mainstream motor type in the market and are widely used in modern industrial systems. However, in the related technology, since the two adjacent permanent magnets of the permanent magnet motor are attached to each other or only separated from each other by a magnetic isolation bridge, the permanent magnets have a serious problem of magnetic leakage, especially at the two ends of the permanent magnets along the circumference of the rotor assembly, the magnetic leakage problem is more serious, resulting in low utilization of the permanent magnets and affecting the performance of the motor. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a rotor assembly that can reduce magnetic leakage, increase the utilization rate of permanent magnets, and thus improve the performance of the motor.

[0004] The utility model also provides a motor having the rotor assembly and an electrical device having the motor.

[0005] According to the rotor assembly of the first aspect of the present invention, the rotor assembly includes a rotor yoke; a first permanent magnet is arranged on the inner circumference of the rotor yoke, and along the radial direction of the rotor yoke, the side of the first permanent magnet close to the rotation axis of the rotor yoke is an S pole, and the side of the first permanent magnet away from the rotation axis is an N pole; a second permanent magnet is arranged on the inner circumference of the rotor yoke, and the second permanent magnet and the first permanent magnet are arranged at intervals along the circumferential direction of the rotor yoke, and along the radial direction, the side of the second permanent magnet close to the rotation axis of the rotor yoke is an N pole, and the side of the second permanent magnet away from the rotation axis is an S pole; a third permanent magnet is arranged on the inner circumference of the rotor yoke and is located between the first permanent magnet and the second permanent magnet, and the magnetization direction of the third permanent magnet is from the first permanent magnet to the second permanent magnet.

[0006] According to the rotor assembly of the embodiment of the first aspect of the utility model, there are at least the following beneficial effects: by arranging a third permanent magnet between the first permanent magnet and the second permanent magnet, and the magnetization direction of the third permanent magnet is from the first permanent magnet to the second permanent magnet, the magnetic field of the third permanent magnet can be used to enhance the guidance of the magnetic lines of force from the first permanent magnet to the second permanent magnet, thereby reducing the leakage magnetic flux at the circumferential ends of the first permanent magnet and the second permanent magnet along the rotor yoke, and at the same time, it is beneficial to reduce the saturation degree of the magnetic circuit in the rotor yoke, thereby improving the utilization rate of the first permanent magnet and the second permanent magnet, enhancing the magnetic field, and helping to improve the torque, working efficiency and other performance of the motor.

[0007] According to some embodiments of the present invention, the first permanent magnet has a symmetry center line, which intersects and is perpendicular to the rotation axis, and the magnetization direction of the first permanent magnet is parallel to the symmetry center line; or, the opposite direction of the magnetization direction of the first permanent magnet points to the rotation axis; or, the opposite direction of the magnetization direction of the first permanent magnet points to a first reference point, the first reference point is located on the symmetry center line, and the first reference point is located between the first permanent magnet and the rotation axis.

[0008] According to some embodiments of the present invention, the second permanent magnet has a symmetry center line, which intersects and is perpendicular to the rotation axis, and the magnetization direction of the second permanent magnet is parallel to the symmetry center line; or, the magnetization direction of the second permanent magnet points to the rotation axis; or, the magnetization direction of the second permanent magnet points to a second reference point, the second reference point is located on the symmetry center line, and the second reference point is located between the second permanent magnet and the rotation axis.

[0009] According to some embodiments of the present invention, the third permanent magnet has a symmetry center line, the symmetry center line intersects and is perpendicular to the rotation axis, and the magnetization direction of the third permanent magnet is perpendicular to the symmetry center line.

[0010] According to some embodiments of the present invention, along the radial direction of the rotor yoke, the maximum thickness of the first permanent magnet is T1, the maximum thickness of the second permanent magnet is T2, and the maximum thickness of the third permanent magnet is T3, satisfying: T3>T1, T3>T2.

[0011] According to some embodiments of the present invention, a third mounting groove is provided on the wall surface of the rotor yoke facing the rotation axis, the third permanent magnet is partially accommodated in the third mounting groove, and the first permanent magnet and the second permanent magnet respectively contact the two sides of the third permanent magnet along the circumference of the rotor yoke.

[0012] According to some embodiments of the present invention, the first permanent magnet has a first wall surface facing the rotation axis, the second permanent magnet has a second wall surface facing the rotation axis, and the third permanent magnet has a third wall surface facing the rotation axis, and along the circumference of the rotor yoke, both ends of the third wall surface are respectively connected to the first wall surface and the second wall surface.

[0013] According to some embodiments of the utility model, a first mounting groove, a second mounting groove and a third mounting groove are provided on the wall surface of the rotor yoke facing the rotation axis, and the first mounting groove, the third mounting groove and the second mounting groove are arranged in sequence along the circumference of the rotor yoke, the first permanent magnet is installed in the first mounting groove, the second permanent magnet is installed in the second mounting groove, and the third permanent magnet is installed in the third mounting groove.

[0014] According to some embodiments of the present invention, the third mounting groove has a third width along the circumferential direction of the rotor yoke, and the third width decreases along the radial direction of the rotor yoke and toward the rotation axis.

[0015] According to some embodiments of the present invention, along the circumference of the rotor yoke, the first mounting groove has a first width, the second mounting groove has a second width, and along the radial direction of the rotor yoke and toward the rotation axis, the first width and the second width both decrease.

[0016] According to some embodiments of the present invention, the first permanent magnet has a first wall surface facing the rotation axis, the second permanent magnet has a second wall surface facing the rotation axis, the third permanent magnet has a third wall surface facing the rotation axis, the rotor yoke includes a first isolation portion and a second isolation portion, the first isolation portion is located between the first mounting groove and the third mounting groove, the first isolation portion has a fourth wall surface facing the rotation axis, the second isolation portion is located between the second mounting groove and the third mounting groove, the second isolation portion has a fifth wall surface facing the rotation axis, and on a projection plane perpendicular to the rotation axis, the projection of the first wall surface, the projection of the second wall surface, the projection of the third wall surface, the projection of the fourth wall surface and the projection of the fifth wall surface form a first reference circle, and the center of the first reference circle coincides with the rotation axis.

[0017] According to some embodiments of the utility model, along the circumferential direction of the rotor yoke, the first permanent magnet has a sixth wall surface and a seventh wall surface that are opposite to each other, and the maximum distance between the sixth wall surface and the seventh wall surface is W1; the second permanent magnet has an eighth wall surface and a ninth wall surface that are opposite to each other, and the maximum distance between the eighth wall surface and the ninth wall surface is W2; the third permanent magnet has a tenth wall surface and an eleventh wall surface that are opposite to each other, and the maximum distance between the tenth wall surface and the eleventh wall surface is W3, satisfying: W3<W1, W3<W2.

[0018] The motor according to the second embodiment of the utility model comprises a stator assembly and a rotor assembly according to the first embodiment of the utility model, wherein the rotor assembly is wound around the outer circumference of the stator assembly.

[0019] The motor according to the embodiment of the second aspect of the utility model has at least the following beneficial effects: since the motor adopts the above-mentioned rotor assembly, by arranging the third permanent magnet between the first permanent magnet and the second permanent magnet, and the magnetization direction of the third permanent magnet is from the first permanent magnet to the second permanent magnet, the magnetic field of the third permanent magnet can be used to enhance the guidance of the magnetic lines of force from the first permanent magnet to the second permanent magnet, thereby reducing the leakage magnetic flux at the circumferential ends of the first permanent magnet and the second permanent magnet along the rotor yoke. At the same time, it is beneficial to reduce the saturation degree of the magnetic circuit in the rotor yoke, thereby improving the utilization rate of the first permanent magnet and the second permanent magnet, enhancing the magnetic field, and helping to improve the torque, working efficiency and other performance of the motor.

[0020] The electrical device according to the embodiment of the third aspect of the utility model includes the motor according to the embodiment of the second aspect of the utility model.

[0021] The electrical equipment according to the embodiment of the third aspect of the utility model has at least the following beneficial effects: since the electrical equipment adopts the above-mentioned motor, by arranging the third permanent magnet between the first permanent magnet and the second permanent magnet, and the magnetization direction of the third permanent magnet is from the first permanent magnet to the second permanent magnet, the magnetic field of the third permanent magnet can be used to enhance the guidance of the magnetic lines of force from the first permanent magnet to the second permanent magnet, thereby reducing the leakage magnetic flux at the circumferential ends of the first permanent magnet and the second permanent magnet along the rotor yoke, and at the same time, it is beneficial to reduce the saturation degree of the magnetic circuit in the rotor yoke, thereby improving the utilization rate of the first permanent magnet and the second permanent magnet, enhancing the magnetic field, and helping to improve the torque, working efficiency and other performance of the motor.

[0022] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0024] Figure 1 is a cross-sectional view of a rotor assembly in one embodiment of the utility model;

[0025] Figure 2 yes Figure 1 A cross-sectional view of a rotor yoke in FIG.

[0026] Figure 3 is a cross-sectional view of the first permanent magnet in an embodiment of the utility model;

[0027] Figure 4 is a cross-sectional view of the second permanent magnet in an embodiment of the utility model;

[0028] Figure 5 is a cross-sectional view of a third permanent magnet in an embodiment of the utility model;

[0029] Figure 6 is a cross-sectional view of a rotor assembly in another embodiment of the utility model;

[0030] Figure 7 yes Figure 6 A cross-sectional view of a rotor yoke in FIG.

[0031] Figure 8 is a cross-sectional view of a motor in one embodiment of the utility model;

[0032] Fig. 9 is a cross-sectional view of a motor in another embodiment of the utility model;

[0033] Fig.10 is a cross-sectional view of a first permanent magnet in another embodiment of the utility model;

[0034] Fig.11 It is a cross-sectional view of the first permanent magnet in another embodiment of the utility model.

[0035] Reference numerals:

[0036] Rotor yoke 100; first mounting groove 110; second mounting groove 120; third mounting groove 130; first isolation portion 140; fourth wall surface 141; second isolation portion 150; fifth wall surface 151; first reference circle 160;

[0037] The first permanent magnet 200; the first wall 210; the twelfth wall 220; the sixth wall 230; the seventh wall 240;

[0038] The second permanent magnet 300; the second wall surface 310; the thirteenth wall surface 320; the eighth wall surface 330; the ninth wall surface 340;

[0039] The third permanent magnet 400; the third wall surface 410; the fourteenth wall surface 420; the tenth wall surface 430; the eleventh wall surface 440;

[0040] Stator assembly 500; stator teeth 510; air gap 520;

[0041] Axis of rotation Z; first reference point Q. DETAILED DESCRIPTION

[0042] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0045] In the description of the present utility model, unless otherwise clearly defined, terms such as setting, installing, connecting, assembling, and matching should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present utility model based on the specific content of the technical solution.

[0046] Since the two adjacent permanent magnets of the rotor assembly of the permanent magnet motor fit each other or are only separated from each other by a magnetic isolation bridge, the permanent magnets have a serious problem of magnetic leakage, especially at the two ends of the permanent magnets along the circumference of the rotor assembly, the magnetic leakage problem is more serious. For example, at the end position of the permanent magnet, after the magnetic lines of force are emitted from the N pole, they directly point to their own S poles through the magnetic isolation bridge and form a closed-loop magnetic circuit, or the magnetic lines of force are directed from the N pole of the first permanent magnet to the S pole of the adjacent second permanent magnet through the magnetic isolation bridge, and from the N pole of the second permanent magnet to the S pole of the first permanent magnet through the magnetic isolation bridge, and form a closed-loop magnetic circuit, or the magnetic lines of force are directed from the N pole of the first permanent magnet to the S pole of the adjacent second permanent magnet, and from the N pole of the second permanent magnet to the S pole of the first permanent magnet, and form a closed-loop magnetic circuit. The above magnetic lines of force do not pass through the stator assembly, thereby forming magnetic leakage, affecting the magnetic field distribution and magnetic field strength between the rotor assembly and the stator assembly, and at the same time causing the utilization rate of the permanent magnet to be low, affecting the performance of the motor.

[0047] For this purpose, refer to Figures 1 to 11 As shown, the first embodiment of the utility model provides a rotor assembly, which is applied to the motor of an electrical device, and the electrical device here can be a fan, an air conditioner compressor, a refrigerator compressor, a drum washing machine, etc. Among them, the motor is an outer rotor motor, specifically, the motor also includes a stator assembly 500, and the rotor assembly is wound around the outer periphery of the stator assembly 500.

[0048] The structure of the rotor assembly is described in detail below by taking the rotor assembly of an outer rotor motor as an example.

[0049] Reference Figure 8 and Fig. 9 As shown, it can be understood that the motor includes a stator assembly 500 and a rotor assembly, wherein the stator assembly 500 includes a stator core and a winding, the stator core includes a plurality of stator teeth 510 arranged in a divergent shape, and the winding is wound on the stator teeth 510. The rotor assembly includes a rotor yoke 100, which is generally annular and is an iron core structure, and the rotor yoke 100 is wound around the outer periphery of the stator core and can rotate relative to the stator core. The rotation axis Z of the rotor yoke 100 is the rotation axis Z of the rotor assembly, and is also the central axis of the rotor yoke 100. At the same time, the central axis of the stator core coincides with the rotation axis Z of the rotor yoke 100.

[0050] Reference Figure 1 , Figure 8 and Fig. 9 As shown, it can be understood that the rotor assembly also includes a plurality of main permanent magnets (i.e., the first permanent magnet 200 or the second permanent magnet 300) and a plurality of secondary permanent magnets (i.e., the third permanent magnet 400), the number of the main permanent magnets is equal to the number of the secondary permanent magnets, and in this embodiment, the rotor assembly includes ten main permanent magnets and ten secondary permanent magnets. Specifically, the main permanent magnets and the secondary permanent magnets are both installed on the inner periphery of the rotor yoke 100, that is, the main permanent magnets and the secondary permanent magnets are both located on the side of the rotor yoke 100 facing the stator core. Generally speaking, an air gap 520 is formed between the main permanent magnets and the secondary permanent magnets and the outer peripheral wall of the stator core. The inside here refers to the side facing the rotation axis Z of the rotor yoke 100, and the opposite side is the outside.

[0051] Reference Figure 1 As shown, it can be understood that a plurality of main permanent magnets are arranged at equal intervals on the inner periphery of the rotor yoke 100 along the circumferential direction of the rotor yoke 100, and the circumferential direction of the rotor yoke 100 is the direction around the rotation axis Z of the rotor yoke 100, and each secondary permanent magnet is arranged between two adjacent main permanent magnets. Among them, the magnetizing direction of the main permanent magnet is along the radial direction of the rotor yoke 100, and the magnetizing directions of the two adjacent main permanent magnets are opposite, and the main permanent magnet serves as the magnetic pole of the rotor assembly; the magnetizing direction of the secondary permanent magnet is along the tangential direction of the rotor yoke 100, and the magnetizing directions of the two adjacent secondary permanent magnets are opposite, and at the same time, the magnetizing direction of each secondary permanent magnet is the same as the direction of the magnetic field formed between the two adjacent main permanent magnets. The magnetizing direction here is the direction of the magnetic field lines of the magnetic field formed by the corresponding permanent magnet, that is, the magnetizing direction is the direction from the S pole through the inside of the permanent magnet to the N pole in the corresponding permanent magnet.

[0052] Reference Figure 1 and Figure 2As shown, it can be understood that the main permanent magnet and the auxiliary permanent magnet can be bonded to the inner circumferential wall of the rotor yoke 100, or the main permanent magnet and the auxiliary permanent magnet can be installed in the installation groove provided on the inner circumferential wall of the rotor yoke 100.

[0053] The following is a detailed description taking two adjacent main permanent magnets and the auxiliary permanent magnet therebetween as an example.

[0054] Reference Figure 1 As shown, it can be understood that two adjacent main permanent magnets are defined as the first permanent magnet 200 and the second permanent magnet 300 , and the auxiliary permanent magnet between the first permanent magnet 200 and the second permanent magnet 300 is the third permanent magnet 400 .

[0055] Reference Figure 1 and Figure 8 As shown, it can be understood that the inner side of the first permanent magnet 200 is an S pole and the outer side is an N pole, and the magnetization direction of the first permanent magnet 200 is from the S pole of the first permanent magnet 200 through the interior of the first permanent magnet 200 to the N pole of the first permanent magnet 200. The inner side of the second permanent magnet 300 is an N pole and the outer side is an S pole, and the magnetization direction of the second permanent magnet 300 is from the S pole of the second permanent magnet 300 through the interior of the second permanent magnet 300 to the N pole of the second permanent magnet 300, and the magnetization direction of the second permanent magnet 300 is opposite to that of the first permanent magnet 200. Therefore, under the action of the magnetic fields of the first permanent magnet 200 and the second permanent magnet 300, a magnetic field is formed between the rotor assembly and the stator assembly 500, and the direction of the magnetic lines of force of the magnetic field is from the N pole of the first permanent magnet 200 through the rotor yoke 100, the S pole of the second permanent magnet 300, the second permanent magnet 300, the N pole of the second permanent magnet 300, the air gap 520, the stator assembly 500, the air gap 520, the S pole of the first permanent magnet 200, the first permanent magnet 200 and back to the N pole of the first permanent magnet 200. The magnetic lines of force are a closed loop, and the magnetic field corresponding to the direction of the magnetic lines of force is the effective magnetic field of the motor.

[0056] Reference Figure 3 As shown, it can be understood that the first permanent magnet 200 has a symmetric center line. Generally speaking, the first permanent magnet 200 is an axisymmetric structure. The first permanent magnet 200 is symmetrically arranged about its own symmetric center line. The symmetric center line of the first permanent magnet 200 intersects and is perpendicular to the rotation axis Z of the rotor yoke 100. The magnetization direction of the first permanent magnet 200 is parallel to the symmetric center line of the first permanent magnet 200.

[0057] Reference Fig.10 As shown, in other embodiments, the opposite direction of the magnetization direction of the first permanent magnet 200 points to the rotation axis Z, that is, the reverse extension line of the magnetization direction of the first permanent magnet 200 intersects with the rotation axis Z.

[0058] Reference Fig.11 As shown, in other embodiments, the opposite direction of the magnetization direction of the first permanent magnet 200 points to the first reference point Q, wherein the first reference point Q is located on the symmetry center line of the first permanent magnet 200 and between the first permanent magnet 200 and the rotation axis Z, that is, the reverse extension line of the magnetization direction of the first permanent magnet 200 intersects with the first reference point Q.

[0059] It is understandable that the magnetization direction of the second permanent magnet 300 can refer to the magnetization direction of the first permanent magnet 200, as long as the magnetization direction of the second permanent magnet 300 is opposite to the magnetization direction of the first permanent magnet 200, which will not be repeated here.

[0060] Reference Figure 1 As shown, it can be understood that the side of the third permanent magnet 400 facing the first permanent magnet 200 is the S pole, and the side facing the second permanent magnet 300 is the N pole, and the magnetization direction of the third permanent magnet 400 is from the S pole of the third permanent magnet 400 through the inside of the third permanent magnet 400 to the N pole of the third permanent magnet 400, that is, the magnetization direction of the third permanent magnet 400 is from the first permanent magnet 200 to the second permanent magnet 300 along the circumferential direction of the rotor yoke 100.

[0061] Therefore, under the action of the magnetic field of the third permanent magnet 400, the direction of the magnetic field lines of the leakage magnetic flux can be adjusted to point from the N pole of the first permanent magnet 200 to the S pole of the second permanent magnet 300, and will not directly return to the S pole of the first permanent magnet 200 through the rotor yoke 100 to form a closed loop, or will not return to the S pole of the first permanent magnet 200 through the second permanent magnet 300, the N pole of the second permanent magnet 300 and the rotor yoke 100 in sequence to form a closed loop, but will be connected to the effective magnetic field of the motor. The directions of the magnetic force lines are consistent and form a closed loop, that is, the magnetic field of the third permanent magnet 400 is used to enhance the guidance of the magnetic force lines from the first permanent magnet 200 to the second permanent magnet 300. Therefore, the magnetic force lines of the original leakage magnetism can be added to the effective magnetic field of the motor, thereby reducing the leakage magnetism of the first permanent magnet 200 and the second permanent magnet 300 along the circumferential end of the rotor yoke 100, improving the utilization rate of the first permanent magnet 200 and the second permanent magnet 300, and further enhancing the effective magnetic field of the motor. At the same time, the magnetic force lines from the N pole of the first permanent magnet 200 to the S pole of the second permanent magnet 300 can pass through the third permanent magnet 400, which is beneficial to reducing the degree of saturation of the magnetic circuit in the rotor yoke 100, further improving the utilization rate of the first permanent magnet 200 and the second permanent magnet 300 and enhancing the magnetic field, which is beneficial to improving the torque and working efficiency of the motor.

[0062] Reference Figure 1As shown, it can be understood that the third permanent magnet 400 has a symmetric center line. Generally speaking, the third permanent magnet 400 is an axisymmetric structure. The third permanent magnet 400 is symmetrically arranged about the symmetric center line. The symmetric center line of the third permanent magnet 400 intersects and is perpendicular to the rotation axis Z of the rotor yoke 100. The magnetization direction of the third permanent magnet 400 is perpendicular to the symmetric center line of the third permanent magnet 400. Therefore, the magnetization direction of the third permanent magnet 400 is the same as and parallel to the direction of the magnetic field between the first permanent magnet 200 and the second permanent magnet 300, which is more conducive to enhancing the guidance of the magnetic field lines from the first permanent magnet 200 to the second permanent magnet 300, reducing magnetic leakage, and enhancing the effective magnetic field of the motor.

[0063] Reference Figure 1 and Figure 3 As shown, it can be understood that on the projection plane perpendicular to the rotation axis Z of the rotating shaft yoke, the projections of the first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400 are all quadrilaterals. Along the radial direction of the rotor yoke 100, the first permanent magnet 200 has a first wall 210 and a twelfth wall 220 that are separated from each other, wherein the first wall 210 faces the rotation axis Z of the rotor yoke 100, and the twelfth wall 220 faces away from the rotation axis Z of the rotor yoke 100, and the maximum distance from the first wall 210 to the twelfth wall 220 is the maximum thickness T1 of the first permanent magnet 200. When measuring T1, a vernier caliper is used to directly clamp the first wall 210 and the twelfth wall 220 and measure the size of the position where the distance between the first wall 210 and the twelfth wall 220 is the largest.

[0064] Reference Figure 1 and Figure 4 As shown, it can be understood that, along the radial direction of the rotor yoke 100, the second permanent magnet 300 has a second wall 310 and a thirteenth wall 320 that are separated from each other, wherein the second wall 310 faces the rotation axis Z of the rotor yoke 100, and the thirteenth wall 320 faces away from the rotation axis Z of the rotor yoke 100, and the maximum distance between the second wall 310 and the thirteenth wall 320 is the maximum thickness T2 of the second permanent magnet 300. When measuring T2, a vernier caliper is used to directly clamp the second wall 310 and the thirteenth wall 320 and measure the size of the position where the distance between the second wall 310 and the thirteenth wall 320 is the largest. Generally speaking, the shape of the first permanent magnet 200 is the same as that of the second permanent magnet 300, and T1=T2.

[0065] Reference Figure 1 and Figure 5As shown, it can be understood that, along the radial direction of the rotor yoke 100, the third permanent magnet 400 has a third wall 410 and a fourteenth wall 420 that are separated from each other, wherein the third wall 410 faces the rotation axis Z of the rotor yoke 100, and the fourteenth wall 420 faces away from the rotation axis Z of the rotor yoke 100, and the maximum distance between the third wall 410 and the fourteenth wall 420 is the maximum thickness T3 of the third permanent magnet 400. When measuring T3, a vernier caliper is used to directly clamp the third wall 410 and the fourteenth wall 420 and measure the size of the position where the distance between the third wall 410 and the fourteenth wall 420 is the largest. Satisfy: T3>T1, T3>T2, that is, the maximum thickness of the third permanent magnet 400 is greater than the maximum thickness of the first permanent magnet 200, and the maximum thickness of the third permanent magnet 400 is greater than the maximum thickness of the second permanent magnet 300. Therefore, along the circumference of the rotor yoke 100, the two opposite wall surfaces of the third permanent magnet 400 can respectively cover the maximum thickness range of the first permanent magnet 200 and the second permanent magnet 300, so that the range of the third permanent magnet 400 guiding the magnetic lines of force from the first permanent magnet 200 to the second permanent magnet 300 is beneficial to further reduce leakage flux and increase the effective magnetic field of the motor.

[0066] Reference Figure 1 and Figure 2 As shown, it can be understood that the rotor yoke 100 is provided with a third mounting groove 130. Specifically, the third mounting groove 130 is located on the side of the rotor yoke 100 facing the rotation axis Z of the rotor yoke 100, that is, the third mounting groove 130 is provided on the inner peripheral wall of the rotor yoke 100, and the third mounting groove 130 penetrates the rotor yoke 100 along the direction of the rotation axis Z of the rotor yoke 100, and the opening of the third mounting groove 130 faces the rotation axis Z of the rotor yoke 100. The number of the third mounting grooves 130 is equal to the number of the secondary permanent magnets. The end of the third permanent magnet 400 that is away from the rotation axis Z of the rotor yoke 100 is accommodated in the third mounting groove 130, that is, the third permanent magnet 400 is partially accommodated in the third mounting groove 130, and the end of the third permanent magnet 400 that is close to the rotation axis Z of the rotor yoke 100 protrudes inwardly from the inner peripheral wall of the rotor yoke 100.

[0067] Reference Figure 1As shown, it can be understood that the first permanent magnet 200 and the second permanent magnet 300 are respectively in contact with the third permanent magnet 400 on both sides along the circumference of the rotor yoke 100. Therefore, in the entire rotor assembly, after a plurality of secondary permanent magnets (i.e., the third permanent magnet 400) are installed on the rotor yoke 100, an installation space for installing the main permanent magnet (i.e., the first permanent magnet 200 or the second permanent magnet 300) is formed between every two secondary permanent magnets (i.e., the third permanent magnet 400), and the main permanent magnet is accommodated in the installation space, thereby simplifying the structure of the rotor yoke 100 and facilitating production, and the main permanent magnet is respectively in contact with the two adjacent secondary permanent magnets on both sides along the circumference of the rotor yoke 100. Therefore, when assembling the rotor assembly, first install the secondary permanent magnet in the third mounting groove 130 of the rotor yoke 100, and position the secondary permanent magnet through the third mounting groove 130, and then install the main permanent magnet between two adjacent secondary permanent magnets, and position the main permanent magnet through the two adjacent secondary permanent magnets to facilitate assembly.

[0068] Reference Figure 1 As shown, it can be understood that along the circumference of the rotor yoke 100, the two ends of the third wall 410 are respectively connected with the first wall 210 and the second wall 310, that is, the first wall 210, the third wall 410 and the second wall 310 are sequentially connected together along the circumference of the rotor yoke 100, and form a part of the inner circumferential wall of the rotor assembly. The walls of the plurality of main permanent magnets (i.e., the first permanent magnet 200 or the second permanent magnet 300) and the plurality of secondary permanent magnets (i.e., the third permanent magnet 400) facing the rotation axis Z of the rotor yoke 100 are sequentially connected to form the inner circumferential wall of the rotor assembly, so that the inner circumferential wall of the rotor assembly is a continuous wall surface to ensure the balance and stability of the rotor assembly during rotation. Specifically, the first wall 210, the second wall 310 and the third wall 410 can be planes. At this time, on the projection plane perpendicular to the rotation axis Z of the rotor yoke 100, the projection of the inner circumferential wall of the rotor assembly is a polygon.

[0069] Of course, in other embodiments, the first wall 210, the second wall 310 and the third wall 410 may be arc surfaces, and on the projection plane perpendicular to the rotation axis Z of the rotor yoke 100, the first wall 210, the second wall 310 and the third wall 410 are on the same reference circle whose center is located on the rotation axis Z of the rotor yoke 100. Therefore, on the projection plane perpendicular to the rotation axis Z of the rotor yoke 100, the projection of the inner circumferential wall of the rotor assembly is circular.

[0070] Therefore, T3>T1, T3>T2 are satisfied, so that the third permanent magnet 400 can be pre-installed in the rotor yoke 100, and the third permanent magnet 400 is used as a positioning and installation reference for the first permanent magnet 200 and the second permanent magnet 300, so as to facilitate the installation of the first permanent magnet 200 and the second permanent magnet 300, that is, the auxiliary permanent magnet is used as the positioning and installation reference for the main permanent magnet; at the same time, after the main permanent magnet and the auxiliary permanent magnet are installed, the inner circumferential wall of the rotor assembly can be made into a continuous wall surface to ensure the balance and stability of the rotor assembly during rotation.

[0071] Reference Figure 6 and Figure 7 As shown, it can be understood that, in other embodiments, the rotor yoke 100 is provided with a first mounting groove 110, a second mounting groove 120 and a third mounting groove 130, and the first mounting groove 110, the second mounting groove 120 and the third mounting groove 130 are all provided on the inner peripheral wall of the rotor yoke 100, and the first mounting groove 110, the third mounting groove 130 and the second mounting groove 120 are sequentially spaced along the circumferential direction of the rotor yoke 100. Similarly, the first mounting groove 110, the second mounting groove 120 and the third mounting groove 130 all penetrate the rotor yoke 100 along the direction of the rotation axis Z of the rotor yoke 100, and the openings of the first mounting groove 110, the second mounting groove 120 and the third mounting groove 130 all face the rotation axis Z of the rotor yoke 100. The number of the first mounting grooves 110 is equal to the number of the second mounting grooves 120, and the sum of the number of the first mounting grooves 110 and the number of the second mounting grooves 120 is equal to the number of the main permanent magnets, and the number of the third mounting grooves 130 is equal to the number of the secondary permanent magnets. The first permanent magnet 200 is accommodated in the first mounting groove 110, the second permanent magnet 300 is accommodated in the second mounting groove 120, and the third permanent magnet 400 is accommodated in the third mounting groove 130. Therefore, in the entire rotor assembly, the secondary permanent magnet is installed in the third mounting groove 130, and the main permanent magnet is installed in the first mounting groove 110 and the second mounting groove 120 respectively. When assembling the rotor assembly, the main permanent magnet is positioned by the first mounting groove 110 and the second mounting groove 120, and the secondary permanent magnet is positioned by the third mounting groove 130, that is, the installation and positioning of the main permanent magnet and the secondary permanent magnet are independent of each other and do not affect each other, which is conducive to simplifying the assembly process and reducing the assembly error.

[0072] Reference Figure 6 and Figure 7As shown, it can be understood that since the first mounting groove 110, the third mounting groove 130 and the second mounting groove 120 are sequentially arranged at intervals along the circumferential direction of the rotor yoke 100, the rotor yoke 100 is formed with a first isolating portion 140 and a second isolating portion 150, wherein the first isolating portion 140 is formed between the first mounting groove 110 and the third mounting groove 130, and the second isolating portion 150 is formed between the second mounting groove 120 and the third mounting groove 130. In the entire rotor yoke 100, the number of the first isolating portions 140 is equal to the number of the second isolating portions 150, and the number of the first isolating portions 140 is equal to the number of the third mounting grooves 130. The first isolating portion 140 has a fourth wall surface 141 facing the rotation axis Z of the rotor yoke 100, and the second isolating portion 150 has a fifth wall surface 151 facing the rotation axis Z of the rotor yoke 100. The first wall surface 210, the fourth wall surface 141, the third wall surface 410, the fifth wall surface 151 and the second wall surface 310 are sequentially butted together along the circumference of the rotor yoke 100, and form a part of the inner circumferential wall of the rotor assembly. The walls of the plurality of main permanent magnets (i.e., the first permanent magnet 200 or the second permanent magnet 300), the plurality of secondary permanent magnets (i.e., the third permanent magnet 400), the plurality of first isolating parts 140 and the plurality of second isolating parts 150 facing the rotation axis Z of the rotor yoke 100 are sequentially butted together to form the inner circumferential wall of the rotor assembly, so that the inner circumferential wall of the rotor assembly is a continuous wall surface, so as to ensure the balance and stability of the rotor assembly during rotation.

[0073] Reference Figure 6 As shown, it can be understood that the first wall surface 210, the second wall surface 310, the third wall surface 410, the fourth wall surface 141 and the fifth wall surface 151 are all arc surfaces, and on the projection surface perpendicular to the rotation axis Z of the rotor yoke 100, the projections of the first wall surface 210, the second wall surface 310, the third wall surface 410, the fourth wall surface 141 and the fifth wall surface 151 form a first reference circle 160, and the center of the first reference circle 160 coincides with the rotation axis Z of the rotor yoke 100. Therefore, on the projection surface perpendicular to the rotation axis Z of the rotor yoke 100, the projection of the inner circumferential wall of the rotor assembly is a circle.

[0074] Of course, in other embodiments, the first wall 210, the second wall 310, the third wall 410, the fourth wall 141 and the fifth wall 151 may be planes, in which case the projection of the inner circumferential wall of the rotor assembly on the projection plane perpendicular to the rotation axis Z of the rotor yoke 100 is a polygon.

[0075] Reference Figure 2 and Figure 7As shown, it can be understood that, along the circumference of the rotor yoke 100, the first installation groove 110 has a first width W4, which is the distance between two groove walls of the first installation groove 110 arranged oppositely along the circumference of the rotor yoke 100. Similarly, the second installation groove 120 has a second width W5, which is the distance between two groove walls of the second installation groove 120 arranged oppositely along the circumference of the rotor yoke 100. The third installation groove 130 has a third width W6, which is the distance between two groove walls of the third installation groove 130 arranged oppositely along the circumference of the rotor yoke 100. Along the radial direction of the rotor yoke 100 and toward the direction of the rotation axis Z of the rotor yoke 100, that is, from the outside to the inside of the rotor yoke 100, the first width W4, the second width W5 and the third width W6 all decrease. That is to say, the width of the first mounting groove 110 at the slot opening is smaller than the width at the slot bottom. Similarly, the width of the second mounting groove 120 at the slot opening is smaller than the width at the slot bottom, and the width of the third mounting groove 130 at the slot opening is smaller than the width at the slot bottom. Therefore, when installing the first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400, the first permanent magnet 200 is inserted into the first mounting groove 110 along the direction of the rotation axis Z of the rotor yoke 100, the second permanent magnet 300 is inserted into the second mounting groove 120 along the direction of the rotation axis Z of the rotor yoke 100, and the third permanent magnet 400 is inserted into the third mounting groove 130 along the direction of the rotation axis Z of the rotor yoke 100, so that the first mounting groove 110 can limit the first permanent magnet 200 from detaching from the rotor yoke 100 toward the inner side of the rotor yoke 100, and can prevent the first permanent magnet 200 from detaching from the rotor yoke 100. The magnet 200 is loose. Similarly, the second mounting groove 120 can limit the second permanent magnet 300 from detaching from the rotor yoke 100 toward the inner side of the rotor yoke 100, and the third mounting groove 130 can limit the third permanent magnet 400 from detaching from the rotor yoke 100 toward the inner side of the rotor yoke 100, and can prevent the second permanent magnet 300 and the third permanent magnet 400 from loosening, thereby improving the installation stability of the first permanent magnet 200, the second permanent magnet 300 and the third permanent magnet 400, that is, improving the installation stability of the main permanent magnet and the auxiliary permanent magnet, ensuring the stability of the rotor assembly during rotation and helping to reduce noise.

[0076] Reference Figure 3As shown, it can be understood that, along the circumferential direction of the rotor yoke 100, the first permanent magnet 200 has a sixth wall 230 and a seventh wall 240 that are opposite to each other, and the maximum distance between the sixth wall 230 and the seventh wall 240 is W1, that is, the maximum width of the first permanent magnet 200 is W1. When measuring W1, a vernier caliper is used to directly clamp the sixth wall 230 and the seventh wall 240 and measure the size of the position where the distance between the sixth wall 230 and the seventh wall 240 is the largest. In this embodiment, the maximum width W1 of the first permanent magnet 200 is the distance from the intersection of the sixth wall 230 and the twelfth wall 220 to the intersection of the seventh wall 240 and the twelfth wall 220.

[0077] Reference Figure 4 As shown, it can be understood that, along the circumferential direction of the rotor yoke 100, the second permanent magnet 300 has an eighth wall surface 330 and a ninth wall surface 340 that are opposite to each other, and the maximum distance between the eighth wall surface 330 and the ninth wall surface 340 is W2, that is, the maximum width of the second permanent magnet 300 is W2. When measuring W2, a vernier caliper is used to directly clamp the eighth wall surface 330 and the ninth wall surface 340 and measure the size of the position where the distance between the eighth wall surface 330 and the ninth wall surface 340 is the largest. In this embodiment, the maximum width W2 of the second permanent magnet 300 is the distance from the intersection of the eighth wall surface 330 and the thirteenth wall surface 320 to the intersection of the ninth wall surface 340 and the thirteenth wall surface 320. Generally speaking, W1=W2.

[0078] Reference Figure 5 As shown, it can be understood that, along the circumferential direction of the rotor yoke 100, the third permanent magnet 400 has a tenth wall surface 430 and an eleventh wall surface 440 that are opposite to each other, and the maximum distance between the tenth wall surface 430 and the eleventh wall surface 440 is W3, that is, the maximum width of the third permanent magnet 400 is W3. When measuring W3, a vernier caliper is used to directly clamp the tenth wall surface 430 and the eleventh wall surface 440 and measure the size of the position where the distance between the tenth wall surface 430 and the eleventh wall surface 440 is the largest. In this embodiment, the maximum width W3 of the third permanent magnet 400 is the distance from the intersection of the tenth wall surface 430 and the fourteenth wall surface 420 to the intersection of the eleventh wall surface 440 and the fourteenth wall surface 420.

[0079] Reference Figures 3 to 5As shown, it can be understood that the maximum width W1 of the first permanent magnet 200, the maximum width W2 of the second permanent magnet 300, and the maximum width W3 of the third permanent magnet 400 satisfy: W3<W1, W3<W2. That is, the maximum width of the third permanent magnet 400 is smaller than the maximum width of the first permanent magnet 200, and the maximum width of the third permanent magnet 400 is smaller than the maximum width of the second permanent magnet 300, so that the width of the third permanent magnet 400 is smaller, that is, a secondary permanent magnet with a smaller width is used to reduce the occupied space of the secondary permanent magnet, thereby increasing the installation space of the main permanent magnet, so as to increase the width of the main permanent magnet, enhance the strength of the effective magnetic field, and achieve an increase in the torque of the motor.

[0080] The motor according to the second embodiment of the present invention comprises a stator assembly 500 and a rotor assembly according to the first embodiment of the present invention, wherein the rotor assembly is wound around the outer circumference of the stator assembly 500 .

[0081] Since the motor adopts all the technical solutions of the rotor assembly of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0082] The electrical equipment of the third embodiment of the utility model includes the motor of the second embodiment of the utility model. The electrical equipment can be a fan, an air-conditioning compressor, a refrigerator compressor, a drum washing machine, etc.

[0083] Since the electrical device adopts all the technical solutions of the motor of the above embodiment, it has at least all the beneficial effects brought by the technical solutions of the above embodiment.

[0084] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A rotor assembly, characterized in that: include: rotor yoke; A first permanent magnet is arranged on the inner periphery of the rotor yoke, and along the radial direction of the rotor yoke, a side of the first permanent magnet close to the rotation axis of the rotor yoke is an S pole, and a side of the first permanent magnet away from the rotation axis is an N pole; A second permanent magnet is arranged on the inner circumference of the rotor yoke, the second permanent magnet and the first permanent magnet are arranged at intervals along the circumferential direction of the rotor yoke, and along the radial direction, the side of the second permanent magnet close to the rotation axis of the rotor yoke is an N pole, and the side of the second permanent magnet away from the rotation axis is an S pole; The third permanent magnet is arranged on the inner periphery of the rotor yoke and located between the first permanent magnet and the second permanent magnet. The magnetization direction of the third permanent magnet is from the first permanent magnet to the second permanent magnet.

2. The rotor assembly according to claim 1, characterized in that: The first permanent magnet has a symmetry center line, the symmetry center line intersects and is perpendicular to the rotation axis, and the magnetization direction of the first permanent magnet is parallel to the symmetry center line; Alternatively, the opposite direction of the magnetization direction of the first permanent magnet points to the rotation axis; Alternatively, the opposite direction of the magnetization direction of the first permanent magnet points to a first reference point, the first reference point is located on the symmetry center line, and the first reference point is located between the first permanent magnet and the rotation axis.

3. The rotor assembly according to claim 1, characterized in that: The second permanent magnet has a symmetry center line, the symmetry center line intersects and is perpendicular to the rotation axis, and the magnetization direction of the second permanent magnet is parallel to the symmetry center line; Alternatively, the magnetization direction of the second permanent magnet points to the rotation axis; Alternatively, the magnetization direction of the second permanent magnet points to a second reference point, the second reference point is located on the symmetry center line, and the second reference point is located between the second permanent magnet and the rotation axis.

4. The rotor assembly according to claim 1, characterized in that: The third permanent magnet has a symmetry center line, which intersects and is perpendicular to the rotation axis, and the magnetization direction of the third permanent magnet is perpendicular to the symmetry center line.

5. The rotor assembly according to claim 1, characterized in that: Along the radial direction of the rotor yoke, the maximum thickness of the first permanent magnet is T1, the maximum thickness of the second permanent magnet is T2, and the maximum thickness of the third permanent magnet is T3, satisfying: T3>T1, T3>T2.

6. The rotor assembly according to claim 5, characterized in that: A third mounting groove is provided on the wall surface of the rotor yoke facing the rotation axis, the third permanent magnet is partially accommodated in the third mounting groove, and the first permanent magnet and the second permanent magnet respectively abut against two sides of the third permanent magnet along the circumferential direction of the rotor yoke.

7. The rotor assembly according to claim 6, characterized in that: The first permanent magnet has a first wall surface facing the rotation axis, the second permanent magnet has a second wall surface facing the rotation axis, and the third permanent magnet has a third wall surface facing the rotation axis. Along the circumference of the rotor yoke, both ends of the third wall surface are respectively connected to the first wall surface and the second wall surface.

8. The rotor assembly according to claim 5, characterized in that: The wall surface of the rotor yoke facing the rotation axis is provided with a first mounting groove, a second mounting groove and a third mounting groove, the first mounting groove, the third mounting groove and the second mounting groove are arranged in sequence along the circumference of the rotor yoke, the first permanent magnet is installed in the first mounting groove, the second permanent magnet is installed in the second mounting groove, and the third permanent magnet is installed in the third mounting groove.

9. The rotor assembly according to claim 6 or 8, characterized in that: The third mounting groove has a third width along the circumferential direction of the rotor yoke, and the third width decreases along the radial direction of the rotor yoke and toward the rotation axis.

10. The rotor assembly according to claim 8, characterized in that: Along the circumference of the rotor yoke, the first installation groove has a first width, and the second installation groove has a second width. Along the radial direction of the rotor yoke and toward the rotation axis, the first width and the second width both decrease gradually.

11. The rotor assembly according to claim 8, characterized in that: The first permanent magnet has a first wall surface facing the rotation axis, the second permanent magnet has a second wall surface facing the rotation axis, the third permanent magnet has a third wall surface facing the rotation axis, the rotor yoke includes a first isolating portion and a second isolating portion, the first isolating portion is located between the first mounting groove and the third mounting groove, the first isolating portion has a fourth wall surface facing the rotation axis, the second isolating portion is located between the second mounting groove and the third mounting groove, the second isolating portion has a fifth wall surface facing the rotation axis, and on a projection plane perpendicular to the rotation axis, the projection of the first wall surface, the projection of the second wall surface, the projection of the third wall surface, the projection of the fourth wall surface and the projection of the fifth wall surface form a first reference circle, and the center of the first reference circle coincides with the rotation axis.

12. The rotor assembly according to claim 1, characterized in that: Along the circumferential direction of the rotor yoke, the first permanent magnet has a sixth wall and a seventh wall facing away from each other, and the maximum distance between the sixth wall and the seventh wall is W1; the second permanent magnet has an eighth wall and a ninth wall facing away from each other, and the maximum distance between the eighth wall and the ninth wall is W2; the third permanent magnet has a tenth wall and an eleventh wall facing away from each other, and the maximum distance between the tenth wall and the eleventh wall is W3, satisfying: W3<W1, W3<W2.

13. A motor, characterized in that include: stator assembly; The rotor assembly according to any one of claims 1 to 12, wherein the rotor assembly is wound around the outer circumference of the stator assembly.

14. An electrical device, characterized in that: Comprising the motor as claimed in claim 13.

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