Rotor assembly, motor and electrical equipment

Abstract

The utility model discloses a rotor assembly, a motor and electrical equipment, the rotor assembly comprises a rotor iron core, the rotor iron core comprises a plurality of iron core units, and each iron core unit comprises an iron core body; the number of the permanent magnets is multiple, the multiple permanent magnets and the multiple iron core bodies are alternately arranged in the circumferential direction of the rotor assembly, protrusions are arranged on at least one side of the two sides, in the circumferential direction of the rotor assembly, of the iron core bodies, and the permanent magnets are located on the inner sides or the outer sides, in the radial direction of the rotor assembly, of the protrusions; a receding groove facing the permanent magnet is formed in the connecting position of at least one protrusion and the iron core body, the receding groove extends in the axial direction of the rotor assembly, and the corner, opposite to the receding groove, of the permanent magnet is a right angle. According to the utility model, the anti-demagnetization capability of the permanent magnets can be improved, the demagnetization current of the motor can be improved, the use amount of the permanent magnets can be increased, the output capability and the efficiency level of the motor can be improved, the magnetic bridge width at the bulge can be reduced, and the magnetic leakage can be reduced. In addition, processing and size control of the permanent magnet are facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field especially is related to a rotor assembly, motor and electrical equipment. BACKGROUND

[0002] In the related art, the rotor of the direct-current permanent magnet motor of the air conditioner fan adopts an IPM (Interior Permanent Magnet Motor) structure, which can effectively improve the output capacity of the motor, but the magnetic density level in the motor is increased, resulting in an increased demagnetization risk of the rotor magnetic tile. When designing, sufficient demagnetization current needs to be ensured to meet the stability requirements of the motor under different working conditions. SUMMARY

[0003] The utility model discloses at least one of the technical problems in the prior art. To this end, the utility model provides a rotor assembly, which can improve the demagnetization resistance of the permanent magnet.

[0004] The utility model further provides a motor, which comprises the rotor assembly.

[0005] The utility model further provides an electrical equipment, which comprises the motor.

[0006] The rotor assembly according to the utility model embodiment comprises a rotor core, the rotor core comprises a plurality of core units, and the core units comprise core bodies; a plurality of permanent magnets, the plurality of permanent magnets and the plurality of core bodies are alternately arranged in the circumferential direction of the rotor assembly, the core bodies are provided with protrusions on at least one side of the two sides along the circumferential direction of the rotor assembly, the permanent magnets are located on the inner side or the outer side of the protrusions along the radial direction of the rotor assembly, at least one connection between the protrusion and the core body is provided with a clearance groove facing the permanent magnet, the clearance groove extends along the axial direction of the rotor assembly, and the corner opposite to the clearance groove of the permanent magnet is a right angle.

[0007] According to the rotor assembly provided by the embodiment of the utility model, the protrusion is arranged on at least one of the two sides of the iron core body along the circumferential direction of the rotor assembly, the permanent magnet is located on the inner side or the outer side of the protrusion along the radial direction of the rotor assembly, and the accommodation slot is arranged at the connection between the at least one protrusion and the iron core body and faces the permanent magnet, the accommodation slot extends along the axial direction of the rotor assembly, meanwhile, the corner of the permanent magnet opposite to the accommodation slot is a right angle, the anti-demagnetization capability of the permanent magnet at the corner opposite to the accommodation slot can be improved, the local demagnetization of the permanent magnet is reduced, the anti-demagnetization capability of the motor is improved to a certain extent, and the demagnetization current of the motor is improved.

[0008] According to some embodiments of the utility model, the accommodation slot comprises a first slot on the iron core body and a second slot on the protrusion, and the first slot and the second slot are communicated.

[0009] According to some embodiments of the utility model, the protrusion comprises a first protrusion, and the accommodation slot comprises a first accommodation slot, at least one of the two sides of the iron core body along the circumferential direction of the rotor assembly is provided with the first protrusion, the first protrusion is located at the outer end of the iron core body along the radial direction of the rotor assembly, the permanent magnet is located on the radial inner side of the first protrusion, and the first accommodation slot facing the permanent magnet is arranged at the connection between the at least one first protrusion and the iron core body, and the corner of the permanent magnet opposite to the first accommodation slot is a right angle.

[0010] In some embodiments of the utility model, the minimum distance between the inner wall of the first accommodation slot and the outer wall surface of the end of the iron core body away from the axis of the rotor assembly is h2, and the following condition is met: h2>=0.5mm; and / or, the minimum distance between the inner wall of the first accommodation slot and the outer wall surface of the end of the iron core body away from the axis of the rotor assembly is h2, the distance between the inner wall of the part of the first accommodation slot on the iron core body and the side wall of the permanent magnet close to the iron core body is h1, and the following condition is met: 0.25<=h1 / h2<=0.65; and / or, the radial length of the permanent magnet is L, the radial maximum dimension of the first accommodation slot is W2, and the following condition is met: 0.1<=W2 / L<=0.16.

[0011] In some embodiments of the utility model, the first protrusions are arranged on both sides of the iron core body along the circumferential direction of the rotor assembly, the iron core body comprises a plurality of laminations arranged along the axial direction of the rotor assembly, each of the laminations is provided with a first lamination and a second lamination on both sides thereof along the circumferential direction of the rotor assembly, a plurality of the first laminations form one of the first protrusions, and a plurality of the second laminations form another of the first protrusions.

[0012] In some embodiments of the utility model, the first lamination and the first lamination are completely same as the second lamination and the second lamination respectively.

[0013] In some embodiments of the utility model, the first protrusions are arranged on both sides of the iron core body along the circumferential direction of the rotor assembly, the iron core body comprises a plurality of laminations arranged along the axial direction of the rotor assembly, each of the laminations is provided with a first lamination and a second lamination on both sides thereof along the circumferential direction of the rotor assembly, a plurality of the first laminations form one of the first protrusions, and a plurality of the second laminations form another of the first protrusions.

[0014] According to some embodiments of the utility model, the protrusions comprise second protrusions, the recesses comprise second recesses, at least one of both sides of the iron core body along the circumferential direction of the rotor assembly is provided with the second protrusion, the second protrusion is located at the inner end of the iron core body along the radial direction of the rotor assembly, the permanent magnet is located at the radial outer side of the second protrusion, the connection between at least one of the second protrusions and the iron core body is provided with the second recess towards the permanent magnet, and the opposite corner of the permanent magnet and the second recess is a right angle.

[0015] In some embodiments of the utility model, the minimum width of the iron core body at the second recess is w, and w is greater than or equal to 0.5mm.

[0016] In some embodiments of the utility model, the first protrusions are arranged on both sides of the iron core body along the circumferential direction of the rotor assembly, the iron core body comprises a plurality of laminations arranged along the axial direction of the rotor assembly, each of the laminations is provided with a first lamination and a second lamination on both sides thereof along the circumferential direction of the rotor assembly, a plurality of the first laminations form one of the first protrusions, and a plurality of the second laminations form another of the first protrusions.

[0017] In some embodiments of the utility model, the first punching piece and the third tab are respectively identical with the second punching piece and the fourth tab.

[0018] In some embodiments of the utility model, the iron core body is provided with the second protrusion on both sides in the circumferential direction of the rotor assembly, and the iron core body comprises a plurality of punching pieces stacked in the axial direction of the rotor assembly, each of the punching pieces is provided with a third tab and a fourth tab on both sides in the circumferential direction of the rotor assembly, the plurality of third tabs form one of the second protrusions, and the plurality of fourth tabs form the other second protrusion.

[0019] According to some embodiments of the utility model, in the cross section perpendicular to the axial direction of the rotor assembly, the permanent magnet is rectangular, and the side edges of the permanent magnet extending in the axial direction of the rotor assembly are all right angles.

[0020] According to some embodiments of the utility model, the permanent magnet is provided with a chamfer between at least one end face in the axial direction of the rotor assembly and the side wall of the permanent magnet.

[0021] In some embodiments of the utility model, in the circumferential direction of the rotor assembly, the thickness of the magnet is H, the chamfer is a round chamfer, the radius of the round chamfer is R1, and 0.06 <= R1 / H <= 0.24 is satisfied; or, the chamfer is a straight edge chamfer, the chamfer size of the straight edge is C1, and 0.06 <= C1 / H <= 0.24 is satisfied.

[0022] According to some embodiments of the utility model, in the cross section perpendicular to the axial direction of the rotor assembly, the shape of the accommodation slot is circular, elliptical or polygonal.

[0023] According to some embodiments of the utility model, the iron core body is provided with a positioning hole and an injection hole penetrating through the iron core body in the axial direction of the rotor assembly and a rivet point for connecting the punching pieces of the iron core body.

[0024] The motor according to the embodiments of the utility model comprises the rotor assembly.

[0025] According to the motor of the embodiment of the utility model, through the above-mentioned rotor assembly, the protrusion is arranged on at least one side of the two sides of the iron core body along the circumferential direction of the rotor assembly, the permanent magnet is located on the inner side or the outer side of the protrusion along the radial direction of the rotor assembly, the accommodation slot is arranged at the connection of the at least one protrusion and the iron core body and faces the permanent magnet, the accommodation slot extends along the axial direction of the rotor assembly, the corner of the permanent magnet opposite to the accommodation slot is a right angle, the anti-demagnetization capability of the permanent magnet at the corner opposite to the accommodation slot can be improved, the local demagnetization of the permanent magnet is reduced, the anti-demagnetization capability of the motor is improved to a certain extent, the demagnetization current of the motor is improved, the use amount of the permanent magnet at the corner opposite to the accommodation slot can be increased, the output capability and the efficiency level of the motor are improved, the magnetic bridge width at the protrusion can be reduced, and the magnetic flux leakage is reduced, the side edge of the permanent magnet opposite to the accommodation slot is a right angle, the chamfering process of the permanent magnet can be omitted, the processing and the size control of the permanent magnet are facilitated.

[0026] According to the electric appliance of the embodiment of the utility model, the above-mentioned motor is arranged.

[0027] According to the electric appliance of the embodiment of the utility model, through the above-mentioned motor, the protrusion is arranged on at least one side of the two sides of the iron core body along the circumferential direction of the rotor assembly, the permanent magnet is located on the inner side or the outer side of the protrusion along the radial direction of the rotor assembly, the accommodation slot is arranged at the connection of the at least one protrusion and the iron core body and faces the permanent magnet, the accommodation slot extends along the axial direction of the rotor assembly, the corner of the permanent magnet opposite to the accommodation slot is a right angle, the anti-demagnetization capability of the permanent magnet at the corner opposite to the accommodation slot can be improved, the local demagnetization of the permanent magnet is reduced, the anti-demagnetization capability of the motor is improved to a certain extent, the demagnetization current of the motor is improved, the use amount of the permanent magnet at the corner opposite to the accommodation slot can be increased, the output capability and the efficiency level of the motor are improved, the magnetic bridge width at the protrusion can be reduced, and the magnetic flux leakage is reduced, the side edge of the permanent magnet opposite to the accommodation slot is a right angle, the chamfering process of the permanent magnet can be omitted, the processing and the size control of the permanent magnet are facilitated.

[0028] Additional aspects and advantages of the utility model will be partially given in the following description, some will become obvious from the following description, or be understood through the practice of the utility model. BRIEF DESCRIPTION OF DRAWINGS

[0029] The above and / or additional aspects and advantages of the utility model will become apparent and more readily appreciated from the following description of the embodiments, with reference to the following drawings, in which:

[0030] Figure 1 is the schematic diagram of the motor according to the embodiment of the utility model;

[0031] Figure 2is a top view of the rotor assembly according to an embodiment of the utility model;

[0032] Figure 3 is a sectional view of the rotor assembly according to an embodiment of the utility model;

[0033] Figure 4 is Figure 3 is a partial schematic view of the rotor assembly;

[0034] Figure 5 is Figure 4 is an enlarged view of A in the figure;

[0035] Figure 6 is Figure 4 is an enlarged view of B in the figure;

[0036] Figure 7 is a sectional view of the permanent magnet of the rotor assembly according to an embodiment of the utility model, perpendicular to the axial direction of the rotor assembly;

[0037] Figure 8 is a sectional view of the rotor assembly according to another embodiment of the utility model;

[0038] Figure 9 is Figure 8 is an enlarged view of C in the figure;

[0039] Figure 10 is a sectional view of the rotor assembly according to another embodiment of the utility model, and Figure 8 the sectional positions are different;

[0040] Figure 11 is Figure 10 is an enlarged view of D in the figure;

[0041] Figure 12 is a schematic view of the permanent magnet of the rotor assembly according to an embodiment of the utility model, wherein the chamfer is a rounded chamfer;

[0042] Figure 13 is a schematic view of the permanent magnet of the rotor assembly according to an embodiment of the utility model, wherein the chamfer is a straight edge chamfer;

[0043] Figure 14 is a demagnetization current comparison of the motor and a traditional motor according to an embodiment of the utility model;

[0044] Figure 15 is a line counter EMF of the motor and a traditional motor according to an embodiment of the utility model.

[0045] Reference signs:

[0046] 100, motor;

[0047] 10, rotor assembly;

[0048] 1, rotor core; 11, core unit; 111, core body; 1111, first punching sheet; 1112, second punching sheet; 112, protrusion; 1121, first protrusion; 1122, second protrusion; 1123, first tab; 1124, second tab; 1125, third tab; 1126, fourth tab; 113, displacement slot; 1131, first displacement slot; 1132, second displacement slot; 1133, first slot; 1134, second slot; 114, positioning hole; 115, injection hole; 116, rivet point;

[0049] 2, permanent magnet; 21, chamfer;

[0050] 20, stator assembly; DETAILED DESCRIPTION

[0051] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary only, and are merely intended to explain the present application, and should not be understood as a limitation of the present application.

[0052] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the features limited as "first" and "second" can be explicitly or implicitly included one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0053] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] A rotor assembly 10 according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0055] As shown in Figures 1-4 , the rotor assembly 10 according to an embodiment of the present application comprises a rotor core 1 and permanent magnets 2.

[0056] Specifically, the rotor core 1 comprises a plurality of core units 11, and the core unit 11 comprises a core body 111. The permanent magnets 2 are a plurality of permanent magnets, and the plurality of permanent magnets 2 and the plurality of core bodies 111 are alternately arranged in the circumferential direction of the rotor assembly 10. It can be understood that, along the circumferential direction of the rotor assembly 10, one permanent magnet 2 is arranged between every two adjacent core bodies 111, and one core body 111 is arranged between every two adjacent permanent magnets 2.

[0057] As shown in Figure 3 and Figure 4 , at least one of the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 is provided with a protrusion 112, and the protrusion 112 can extend in the axial direction of the rotor assembly 10. The permanent magnet 2 is located on the inner side or the outer side of the protrusion 112 in the radial direction of the rotor assembly 10. At least one protrusion 112 and the core body 111 are connected, and the connection is provided with a recess 113 facing the permanent magnet 2. Correspondingly, the recess 113 extends in the axial direction of the rotor assembly 10, and the corner of the permanent magnet 2 opposite to the recess 113 is a right angle.

[0058] It can be understood that, at least one of the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 is provided with a protrusion 112, and the protrusion 112 can be located on the radial outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10, or at least one of the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 is provided with a protrusion 112, and the protrusion 112 can be located on the radial inner side of the permanent magnet 2 in the radial direction of the rotor assembly 10, or the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 are provided with protrusions 112, and the two protrusions 112 are respectively located on the radial outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10 on the two sides of the core body 111 along the circumferential direction of the rotor assembly 10, or the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 are provided with protrusions 112, and the two protrusions 112 are respectively located on the radial inner side of the permanent magnet 2 in the radial direction of the rotor assembly 10 on the two sides of the core body 111 along the circumferential direction of the rotor assembly 10, or the two sides of the core body 111 along the circumferential direction of the rotor assembly 10 are provided with protrusions 112, and one of the two protrusions 112 can be located on the radial outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10 on the same side, and the other is located on the radial inner side of the permanent magnet 2 in the radial direction of the rotor assembly 10 on the same side.

[0059] The core body 111 can be provided with one or more protrusions 112 on the same side in the circumferential direction of the rotor assembly 10. When the core body 111 is provided with one protrusion 112 on the same side in the circumferential direction of the rotor assembly 10, the protrusion 112 is located on the inner side or the outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10. When the core body 111 is provided with multiple protrusions 112 on the same side in the circumferential direction of the rotor assembly 10, for example, two protrusions 112, the two protrusions 112 can be located on the inner side and the outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10, respectively.

[0060] In addition, when the core body 111 is provided with multiple protrusions 112, at least one protrusion 112 is provided with a displacement slot 113 at the corner of the core body 111 facing the permanent magnet 2, or each protrusion 112 is provided with a displacement slot 113 at the corner of the core body 111 facing the permanent magnet 2, or part of the protrusions 112 is provided with a displacement slot 113 at the corner of the core body 111 facing the permanent magnet 2.

[0061] In the example shown in FIG. 1, the core body 111 is provided with two protrusions 112 on each side in the circumferential direction of the rotor assembly 10. The two protrusions 112 on the same side in the circumferential direction of the core body 111 are located on the inner side and the outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10, respectively. The connection between each protrusion 112 and the core body 111 is provided with a displacement slot 113 facing the permanent magnet 2. The displacement slot 113 extends in the axial direction of the rotor assembly 10. The four corners of the permanent magnet 2 opposite the four displacement slots 113 are right angles. Figure 3 and Figure 4 In the example shown in FIG. 1, the core body 111 is provided with two protrusions 112 on each side in the circumferential direction of the rotor assembly 10. The two protrusions 112 on the same side in the circumferential direction of the core body 111 are located on the inner side and the outer side of the permanent magnet 2 in the radial direction of the rotor assembly 10, respectively. The connection between each protrusion 112 and the core body 111 is provided with a displacement slot 113 facing the permanent magnet 2. The displacement slot 113 extends in the axial direction of the rotor assembly 10. The four corners of the permanent magnet 2 opposite the four displacement slots 113 are right angles.

[0062] In the present application, by providing the displacement slot 113 at the corner of the protrusion 112 and the core body 111 facing the permanent magnet 2, the corner where the corner angle of the permanent magnet 2 opposite the displacement slot 113 is located can be set as a right angle without chamfering. The anti-demagnetization capability of the permanent magnet 2 at the corner angle opposite the displacement slot 113 can be improved, the local demagnetization of the permanent magnet 2 can be reduced, and the anti-demagnetization capability of the motor 100 can be improved to a certain extent, thereby improving the demagnetization current of the motor 100. In addition, the amount of the permanent magnet 2 at the corner angle opposite the displacement slot 113 can be increased, the output capability and efficiency level of the motor 100 can be improved, and the magnetic bridge width at the protrusion 112 can be reduced, thereby reducing the magnetic flux leakage. In addition, the side edge of the permanent magnet 2 opposite the displacement slot 113 is a right angle, and the chamfering process of the permanent magnet 2 can be omitted, thereby facilitating the machining and size control of the permanent magnet 2.

[0063] According to the rotor assembly 10 of the embodiment of the utility model, by being provided with the protrusion 112 on at least one side of the core body 111 along the circumferential direction of the rotor assembly 10, the permanent magnet 2 is located on the inner side or the outer side of the protrusion 112 along the radial direction of the rotor assembly 10, and the accommodation slot 113 facing the permanent magnet 2 is arranged at the connection of the at least one protrusion 112 and the core body 111, the accommodation slot 113 extends along the axial direction of the rotor assembly 10, and the corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, so that the anti-demagnetization capability of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be improved, the local demagnetization of the permanent magnet 2 is reduced, the anti-demagnetization capability of the motor 100 is improved to a certain extent, and the demagnetization current of the motor 100 is improved. In addition, the use amount of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be increased, the output capability and the efficiency level of the motor 100 are improved, and the magnetic bridge width at the protrusion 112 can be reduced, and the magnetic flux leakage is reduced. In addition, the side corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, so that the chamfering process of the permanent magnet 2 can be omitted, and the processing and the size control of the permanent magnet 2 are facilitated.

[0064] In some embodiments of the utility model, as shown in Figure 5 and Figure 6 The accommodation slot 113 includes the first slot 1133 on the core body 111 and the second slot 1134 on the protrusion 112, and the first slot 1133 and the second slot 1134 are communicated. It can be understood that part of the accommodation slot 113 is located on the core body 111, and part of the accommodation slot 113 is located on the protrusion 112, so that the accommodation slot 113 can accommodate the permanent magnet 2 on both sides of the corner of the permanent magnet 2 opposite to the accommodation slot 113, and the corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle when being inserted between the two core units 11, so that the corner is not damaged, and the anti-demagnetization capability of the permanent magnet 2 is not reduced.

[0065] In addition, as shown in Figure 5 and Figure 6 In the direction from the slot bottom of the first slot 1133 to the open end, the side wall of the end of the first slot 1133 away from the second slot 1134 is inclined to the direction away from the second slot 1134, and in the direction from the slot bottom of the second slot 1134 to the open end, the side wall of the end of the second slot 1134 away from the first slot 1133 is inclined to the direction away from the first slot 1133. Therefore, the processing and the manufacturing of the accommodation slot 113 are facilitated.

[0066] In some embodiments of the utility model, as shown in Figure 4 and Figure 5As shown, the protrusion 112 includes a first protrusion 1121, the relief slot 113 includes a first relief slot 1131, at least one side of the core body 111 along the circumferential direction of the rotor assembly 10 is provided with the first protrusion 1121, the first protrusion 1121 is located at the outer end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnet 2 is located radially inward of the first protrusion 1121, and the connection between the at least one first protrusion 1121 and the core body 111 is provided with the first relief slot 1131 facing the permanent magnet 2. The corner of the permanent magnet 2 opposite to the first relief slot 1131 is a right angle.

[0067] It can be understood that one side of the core body 111 along the circumferential direction of the rotor assembly 10 is provided with the first protrusion 1121, the first protrusion 1121 is located at the outer end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnet 2 is located radially inward of the first protrusion 1121, and the connection between the first protrusion 1121 and the core body 111 is provided with the first relief slot 1131 facing the permanent magnet 2; or both sides of the core body 111 along the circumferential direction of the rotor assembly 10 are provided with the first protrusion 1121, the first protrusion 1121 is located at the outer end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnets 2 on both sides of the core body 111 along the circumferential direction are respectively located radially inward of the two first protrusions 1121, and the connection between one of the two first protrusions 1121 and the core body 111 is provided with the first relief slot 1131 facing the same side permanent magnet 2; or both sides of the core body 111 along the circumferential direction of the rotor assembly 10 are provided with the first protrusion 1121, the first protrusion 1121 is located at the outer end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnets 2 on both sides of the core body 111 along the circumferential direction are respectively located radially inward of the two first protrusions 1121, and the connection between the two first protrusions 1121 and the core body 111 is provided with the first relief slot 1131 facing the same side permanent magnet 2.

[0068] The first protrusion 1121 can limit the permanent magnet 2 in a radially outward direction, guarantee the reliability of the permanent magnet 2, avoid the permanent magnet 2 from being thrown out during the rotation of the rotor assembly 10, and improve the reliability of the motor 100. The first recess 1131 can make the corner of the permanent magnet 2 opposite to the first recess 1131 be a right angle, improve the anti-demagnetization capability of the permanent magnet 2 at the corner opposite to the first recess 1131, reduce the local demagnetization of the permanent magnet 2, improve the anti-demagnetization capability of the motor 100 to a certain extent, and thus improve the demagnetization current of the motor 100. In addition, the use amount of the permanent magnet 2 at the corner opposite to the first recess 1131 can be increased, the output capability and efficiency level of the motor 100 can be improved, and the magnetic bridge width at the first protrusion 1121 can be reduced to reduce the magnetic flux leakage. In addition, the side edge of the permanent magnet 2 opposite to the first recess 1131 is a right angle, the chamfering process of the permanent magnet 2 can be omitted, and the processing and size control of the permanent magnet 2 are facilitated.

[0069] Further, as shown in Figure 4 and Figure 5 , the minimum distance between the inner wall of the first recess 1131 and the outer wall surface of the end of the iron core body 111 away from the axis of the rotor assembly 10 is h2, and h2≥0.5mm is satisfied. Thus, the manufacturing of the iron core unit 11 is facilitated, the batch manufacturing of the iron core unit 11 is facilitated, and the production efficiency is improved. For example, in the example shown in Figure 4 and Figure 5 , h2 is the minimum distance between the second slot 1134 and the outer wall surface of the end of the iron core body 111 away from the axis of the rotor assembly 10.

[0070] In some embodiments of the utility model, as shown in Figure 4 and Figure 5 , the minimum distance between the inner wall of the first recess 1131 and the outer wall surface of the end of the iron core body 111 away from the axis of the rotor assembly 10 is h2, the distance between the inner wall of the part of the first recess 1131 on the iron core body 111 and the side wall of the permanent magnet 2 close to the iron core body 111 is h1, and 0.25≤h1 / h2≤0.65 is satisfied. It can be understood that h1 can be the distance between the inner wall of the first slot 1133 and the surface of the permanent magnet 2 facing the first slot 1133. h1 / h2 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55 or 0.6, etc. Thus, the demagnetization of the permanent magnet 2 can be controlled, and the magnetic flux leakage can be reduced.

[0071] In some embodiments of the utility model, as shown in Figure 5 and Figure 7As shown, the radial length of the permanent magnet 2 is L, and the maximum radial dimension of the first clearance groove 1131 is W2, satisfying: 0.1 ≤ W2 / L ≤ 0.16. W2 / L can be 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, or 0.16, etc. This allows for control of the demagnetization of the permanent magnet 2, reducing magnetic leakage, and facilitating the manufacturing of the core unit 11, enabling mass production of the core unit 11 and improving production efficiency.

[0072] In some embodiments of this utility model, the core body 111 is provided with first protrusions 1121 on both sides of the rotor assembly 10 in the circumferential direction. The core body 111 includes first laminations 1111 and second laminations 1112 stacked alternately in the axial direction of the rotor assembly 10. The first lamination 1111 is provided with a first protrusion 1123 on one side of the rotor assembly 10 in the circumferential direction, and the second lamination 1112 is provided with a second protrusion 1124 on one side of the rotor assembly 10 in the circumferential direction. The first protrusions 1123 and the second protrusions 1124 are located on both sides of the core body 111 in the circumferential direction of the rotor assembly 10. Multiple first protrusions 1123 form one first protrusion 1121, and multiple second protrusions 1124 form another first protrusion 1121.

[0073] It is understood that any two adjacent first protrusions 1123 are spaced apart, with the spacing being the distance of one second lamination 1112, and any two adjacent second protrusions 1124 are spaced apart, with the spacing being the distance of one first lamination 1111. Furthermore, the first protrusion 1121 includes either first protrusions 1123 spaced apart along the axial direction of the rotor assembly 10 or second protrusions 1124 spaced apart along the axial direction of the rotor assembly 10. This reduces magnetic leakage from the permanent magnet 2.

[0074] When a first clearance groove 1131 is present between the first protrusion 1121 formed by multiple first protrusions 1123 and the iron core body 111, the first clearance groove 1131 penetrates through the multiple first protrusions 1123, multiple first laminations 1111, and multiple second laminations 1112. Specifically, the first groove 1133 penetrates through the multiple first laminations 1111 and multiple second laminations 1112, multiple second grooves 1134 penetrate through the multiple first protrusions 1123, and the side of the second lamination 1112 closest to the first protrusion 1123 has only the first groove 1133. When a first clearance groove 1131 is present between the first protrusion 1121 formed by multiple second protrusions 1124 and the iron core body 111, the first clearance groove 1131 penetrates through the multiple second protrusions 1124, multiple first laminations 1111, and multiple second laminations 1112. Specifically, the first groove 1133 penetrates multiple first stamps 1111 and multiple second stamps 1112, and multiple second grooves 1134 penetrate multiple second protrusions 1124. The side of the first stamp 1111 closest to the second protrusion 1124 has only the first groove 1133.

[0075] Optionally, the first punching sheet 1111 and the first tab 1123 are an integral piece, and the second punching sheet 1112 and the second tab 1124 are an integral piece.

[0076] Optionally, the first punching sheet 1111 and the first tab 1123 are completely identical to the second punching sheet 1112 and the second tab 1124 respectively. It can be understood that the overall structure formed by the first punching sheet 1111 and the first tab 1123 is completely identical to the overall structure formed by the second punching sheet 1112 and the second tab 1124. When the overall structure formed by the first punching sheet 1111 and the first tab 1123 and the overall structure formed by the second punching sheet 1112 and the second tab 1124 are alternately stacked, only the second punching sheet 1112 needs to be rotated 180 degrees around the rotation axis in the radial direction relative to the first punching sheet 1111, and at this time, the first tab 1123 and the second tab 1124 are located on the two sides of the core body 111 opposite in the circumferential direction of the rotor assembly 10.

[0077] Therefore, the machining of the overall structure of the first punching sheet 1111 and the first tab 1123 and the machining of the overall structure of the second punching sheet 1112 and the second tab 1124 can be facilitated, the production efficiency can be improved, and the cost can be reduced.

[0078] In some embodiments of the utility model, the core body 111 is provided with a first protrusion 1121 in the circumferential direction of the rotor assembly 10, and the core body 111 includes a plurality of punching sheets stacked in the axial direction of the rotor assembly 10, each punching sheet is provided with a first tab 1123 and a second tab 1124 on the two sides in the circumferential direction of the rotor assembly 10, a plurality of first tabs 1123 form one of the first protrusions 1121, and a plurality of second tabs 1124 form the other first protrusion 1121.

[0079] It can be understood that the plurality of first tabs 1123 are stacked to form the first protrusion 1121, and the adjacent two first tabs 1123 are attached or abutted to each other, the plurality of second tabs 1124 are stacked to form the second protrusion 1122, and the adjacent two second tabs 1124 are attached or abutted to each other.

[0080] When the first protrusion 1121 formed by the plurality of first tabs 1123 is between the core body 111, the first displacement slot 1131 penetrates the plurality of first tabs 1123, the plurality of punching pieces. Specifically, the first slot 1133 penetrates the plurality of first punching pieces, and the plurality of second slots 1134 penetrates the plurality of first tabs 1123. When the first protrusion 1121 formed by the plurality of second tabs 1124 is between the core body 111, the first displacement slot 1131 penetrates the plurality of second tabs 1124, the plurality of first punching pieces. Specifically, the first slot 1133 penetrates the plurality of punching pieces, and the plurality of second slots 1134 penetrates the plurality of second tabs 1124.

[0081] In some embodiments of the utility model, as shown in Figure 4 and Figure 6 The protrusion 112 includes a second protrusion 1122, the displacement slot 113 includes a second displacement slot 1132, the core body 111 is provided with the second protrusion 1122 at least on one side of the circumferential direction of the rotor assembly 10, the second protrusion 1122 is located at the inner end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnet 2 is located at the radial outer side of the second protrusion 1122, at least one second protrusion 1122 and the connecting place of the core body 111 are provided with the second displacement slot 1132 towards the permanent magnet 2, and the corner opposite to the second displacement slot 1132 of the permanent magnet 2 is a right angle.

[0082] It can be understood that the core body 111 is provided with the second protrusion 1122 on one side of the circumferential direction of the rotor assembly 10, the second protrusion 1122 is located at the inner end of the core body 111 along the radial direction of the rotor assembly 10, the permanent magnet 2 is located at the radial outer side of the second protrusion 1122, and the connecting place of the second protrusion 1122 and the core body 111 is provided with the second displacement slot 1132 towards the permanent magnet 2;Or the core body 111 is provided with the second protrusion 1122 on both sides of the circumferential direction of the rotor assembly 10, the second protrusion 1122 is located at the inner end of the core body 111 along the radial direction of the rotor assembly 10, and the permanent magnet 2 on both sides of the core body 111 along the circumferential direction of the rotor is respectively located at the radial outer side of the two second protrusions 1122, and the connecting place of one of the two second protrusions 1122 and the core body 111 is provided with the second displacement slot 1132 towards the permanent magnet 2 on the same side;Or the core body 111 is provided with the second protrusion 1122 on both sides of the circumferential direction of the rotor assembly 10, the second protrusion 1122 is located at the inner end of the core body 111 along the radial direction of the rotor assembly 10, and the permanent magnet 2 on both sides of the core body 111 along the circumferential direction of the rotor is respectively located at the radial outer side of the two second protrusions 1122, and the connecting place of the two second protrusions 1122 and the core body 111 is provided with the second displacement slot 1132 towards the permanent magnet 2 on the same side.

[0083] The second protrusion 1122 can limit the permanent magnet 2 in the radial direction, ensure the reliability of the permanent magnet 2, and improve the reliability of the motor 100. The second recessed groove 1132 can make the corner of the permanent magnet 2 opposite to the second recessed groove 1132 be a right angle, improve the anti-demagnetization capability of the permanent magnet 2 at the corner opposite to the second recessed groove 1132, reduce the local demagnetization of the permanent magnet 2, improve the anti-demagnetization capability of the motor 100 to a certain extent, and thus improve the demagnetization current of the motor 100. In addition, the use amount of the permanent magnet 2 at the corner opposite to the second recessed groove 1132 can be increased, the output capability and efficiency level of the motor 100 can be improved, and the magnetic bridge width at the second protrusion 1122 can be reduced, and the magnetic flux leakage can be reduced. In addition, the side edge of the permanent magnet 2 opposite to the second recessed groove 1132 is a right angle, the chamfering process of the permanent magnet 2 can be omitted, and the processing and size control of the permanent magnet 2 are facilitated.

[0084] In some embodiments of the utility model, as shown in Figure 4 and Figure 6 The minimum width of the iron core body 111 at the second recessed groove 1132 is w, and w is greater than or equal to 0.5 mm. Therefore, the manufacturing of the iron core unit 11 is facilitated, the batch manufacturing of the iron core unit 11 is facilitated, and the production efficiency is improved.

[0085] In some embodiments of the utility model, as shown in Figures 8-11 The iron core body 111 is provided with the second protrusion 1122 on both sides in the circumferential direction of the rotor assembly 10, the iron core body 111 includes the first punching sheet 1111 and the second punching sheet 1112 which are alternately stacked in the axial direction of the rotor assembly 10, the first punching sheet 1111 is provided with the third protrusion 1125 on one side in the circumferential direction of the rotor assembly 10, the second punching sheet 1112 is provided with the fourth protrusion 1126 on one side in the circumferential direction of the rotor assembly 10, the third protrusion 1125 and the fourth protrusion 1126 are located on both sides of the iron core body 111 in the circumferential direction of the rotor assembly 10, a plurality of third protrusions 1125 form one second protrusion 1122, and a plurality of fourth protrusions 1126 form another second protrusion 1122.

[0086] It can be understood that any two adjacent third protrusions 1125 are spaced apart, and the spacing distance is the distance of one second punching sheet 1112, any two adjacent fourth protrusions 1126 are spaced apart, and the spacing distance is the distance of one first punching sheet 1111. In addition, the second protrusion 1122 includes the third protrusion 1125 spaced apart in the axial direction of the rotor assembly 10 or the fourth protrusion 1126 spaced apart in the axial direction of the rotor assembly 10. Therefore, the magnetic flux leakage of the permanent magnet 2 can be reduced.

[0087] When the second recess 1132 is formed between the second protrusion 1122 formed by the plurality of third tabs 1125 and the core body 111, the second recess 1132 penetrates the plurality of third tabs 1125, the plurality of first tabs 1111 and the plurality of second tabs 1112. Specifically, the first slot 1133 penetrates the plurality of first tabs 1111 and the plurality of second tabs 1112, and the plurality of second slots 1134 penetrates the plurality of third tabs 1125, and the second tab 1112 has only the first slot 1133 on the side close to the third tab 1125. When the second recess 1132 is formed between the second protrusion 1122 formed by the plurality of fourth tabs 1126 and the core body 111, the second recess 1132 penetrates the plurality of fourth tabs 1126, the plurality of first tabs 1111 and the plurality of second tabs 1112. Specifically, the first slot 1133 penetrates the plurality of first tabs 1111 and the plurality of second tabs 1112, and the plurality of second slots 1134 penetrates the plurality of fourth tabs 1126, and the first tab 1111 has only the first slot 1133 on the side close to the fourth tab 1126.

[0088] Optionally, the first tab 1111 and the third tab 1125 are an integral piece, and the second tab 1112 and the fourth tab 1126 are an integral piece.

[0089] Optionally, the first tab 1111 and the third tab 1125 are completely same as the second tab 1112 and the fourth tab 1126 respectively. It can be understood that the overall structure formed by the first tab 1111 and the third tab 1125 is completely same as the overall structure formed by the second tab 1112 and the fourth tab 1126. When the overall structure formed by the first tab 1111 and the third tab 1125 and the overall structure formed by the second tab 1112 and the fourth tab 1126 are alternately stacked, only the second tab 1112 needs to be rotated 180 degrees around the rotation axis in the radial direction, and at this time, the third tab 1125 and the fourth tab 1126 are located on the two sides of the core body 111 along the circumferential direction of the rotor assembly 10.

[0090] Therefore, the machining of the overall structure of the first tab 1111 and the third tab 1125 and the machining of the overall structure of the second tab 1112 and the fourth tab 1126 can be facilitated, and the production efficiency can be improved and the cost can be reduced.

[0091] In some embodiments of the utility model, the core body 111 is provided with second protrusions 1122 on the two sides along the circumferential direction of the rotor assembly 10, and the core body 111 comprises a plurality of tabs stacked along the axial direction of the rotor assembly 10, each tab is provided with a third tab 1125 and a fourth tab 1126 on the two sides along the circumferential direction of the rotor assembly 10, the plurality of third tabs 1125 form one of the second protrusions 1122, and the plurality of fourth tabs 1126 form the other second protrusion 1122.

[0092] It can be understood that the plurality of third tabs 1125 are stacked to form the second protrusion 1122, and adjacent two third tabs 1125 are in abutment or abutment with each other, and the plurality of fourth tabs 1126 are stacked to form the second protrusion 1122, and adjacent two fourth tabs 1126 are in abutment or abutment with each other.

[0093] When the second protrusion 1122 formed by the plurality of third tabs 1125 and the core body 111 have the second displacement slot 1132, the second displacement slot 1132 penetrates the plurality of third tabs 1125 and the plurality of punching pieces. Specifically, the first slot 1133 penetrates the plurality of punching pieces, and the plurality of second slots 1134 penetrates the plurality of third tabs 1125. When the second protrusion 1122 formed by the plurality of fourth tabs 1126 and the core body 111 have the second displacement slot 1132, the second displacement slot 1132 penetrates the plurality of fourth tabs 1126 and the plurality of punching pieces. Specifically, the first slot 1133 penetrates the plurality of punching pieces, and the plurality of second slots 1134 penetrates the plurality of fourth tabs 1126.

[0094] In some embodiments of the utility model, as shown in Figure 3 and Figure 7 The core body 111 is provided with two protrusions 112, i.e. the first protrusion 1121 and the second protrusion 1122, on both sides of the rotor assembly 10 in the circumferential direction, the first protrusion 1121 and the second protrusion 1122 on the same side of the core body 111 in the circumferential direction of the rotor assembly 10 are located on the outer side and the inner side of the permanent magnet 2 in the radial direction of the rotor assembly 10 respectively, the first displacement slot 1131 towards the permanent magnet 2 is arranged at the connection between each first protrusion 1121 and the core body 111, the second displacement slot 1132 towards the permanent magnet 2 is arranged at the connection between each second protrusion 1122 and the core body 111, and the permanent magnet 2 is rectangular in the cross section perpendicular to the axial direction of the rotor assembly 10, and the straight angle is arranged at the side edge extending in the axial direction of the rotor assembly 10 of the permanent magnet 2. As shown in Figure 14 and Figure 15 The demagnetization current and the line counter electromotive force of the utility model are improved compared with the traditional scheme.

[0095] Therefore, the anti-demagnetization ability of the permanent magnet 2 can be improved, the local demagnetization of the permanent magnet 2 is reduced, the anti-demagnetization ability of the motor 100 is improved to a certain extent, and the demagnetization current of the motor 100 is improved. In addition, the use amount of the permanent magnet 2 can be increased, the output capacity and the efficiency level of the motor 100 are improved, the magnetic bridge width at the first protrusion 1121 and the second protrusion 1122 can be reduced, and the magnetic flux leakage can be reduced. In addition, the right angle arrangement can omit the chamfering process of the permanent magnet 2, and the machining and size control of the permanent magnet 2 are facilitated.

[0096] In some embodiments of the utility model, as shown in Figure 12 andFigure 13 As shown in the drawings, the permanent magnet 2 has a chamfer 21 between at least one end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and the side wall of the permanent magnet 2. It can be understood that the permanent magnet 2 can have the chamfer 21 between only one end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and the side wall of the permanent magnet 2, or the permanent magnet 2 can have the chamfer 21 between both end faces of the permanent magnet 2 in the axial direction of the rotor assembly 10 and the side wall of the permanent magnet 2. When the permanent magnet 2 has the chamfer 21 between the end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and the side wall of the permanent magnet 2, the permanent magnet 2 can have the chamfer 21 between the end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and part of the side wall of the permanent magnet 2, or the permanent magnet 2 can have the chamfer 21 between the end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and all of the side wall of the permanent magnet 2.

[0097] When the rotor assembly 10 is assembled, the plurality of core units 11 are arranged first, and then the permanent magnet 2 is inserted between two adjacent core units 11. The permanent magnet 2 has the chamfer 21 between at least one end face of the permanent magnet 2 in the axial direction of the rotor assembly 10 and the side wall of the permanent magnet 2. The chamfer 21 can play a guiding role in the process of inserting the permanent magnet 2, thereby facilitating the insertion of the permanent magnet 2 between the two core units 11.

[0098] In some embodiments of the utility model, in the circumferential direction of the rotor assembly 10, the thickness of the magnet is H, as shown in the drawings, Figure 12 As shown in the drawings, the chamfer 21 is a round chamfer, the radius of the round chamfer is R1, and 0.06≤R1 / H≤0.24 is satisfied; as shown in the drawings, Figure 13 As shown in the drawings, the chamfer 21 is a straight edge chamfer, the size of the straight edge chamfer 21 is C1, and 0.06≤C1 / H≤0.24 is satisfied. In this way, the assembly of the permanent magnet 2 between the two core units 11 is facilitated, and the demagnetization resistance of the permanent magnet 2 can be ensured.

[0099] For example, when the chamfer 21 is a round chamfer, R1 / H can be 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22 or 0.23. When the chamfer 21 is a straight edge chamfer, C1 / H can be 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.20, 0.21, 0.22 or 0.23.

[0100] In some embodiments of the utility model, the shape of the accommodation slot 113 is circular, oval or polygonal in the cross section perpendicular to the axial direction of the rotor assembly 10. In this way, the diversity of the structure of the accommodation slot 113 can be increased, and different requirements can be met. When the shape of the accommodation slot 113 is polygonal, the accommodation slot 113 can be rectangular, trapezoidal, etc.

[0101] In some embodiments of the utility model, as shown in Figure 3 、 Figure 4 and Figure 10 , the iron core body 111 is provided with a positioning hole 114 and an injection hole 115 penetrating through the iron core body 111 along the axial direction of the rotor assembly 10 and a rivet point 116 for connecting a plurality of punching sheets of the iron core body 111.

[0102] The iron core body 111 includes a plurality of punching sheets stacked, and the rivet point 116 is used to connect the plurality of punching sheets. Each punching sheet can be punched by a punching device to protrude a protruding point towards one side of the thickness direction of the punching sheet, and a recessed point is arranged at a position corresponding to the protruding point on the other side of the thickness direction of the punching sheet. The protruding point of one of the two adjacent punching sheets is riveted in the recessed point of the other. In the example shown in Figure 4 , the rivet point 116 is multiple, for example, three, one of the three rivet points 116 is located at the inner end of the iron core body 111 along the radial direction of the rotor, and the other two rivet points 116 are located at the outer end of the iron core body 111 along the radial direction of the rotor assembly 10 and are arranged at intervals along the circumferential direction of the rotor assembly 10. Each rivet point 116 is formed in a rectangular shape, that is, each protruding point and each recessed point are formed in a rectangular shape.

[0103] The positioning hole 114 and the injection hole 115 are used to connect a plurality of iron core units 11. The positioning hole 114 is a non-circular hole. When connecting a plurality of iron core units 11, first, the plurality of iron core units 11 are positioned through the positioning hole 114. The positioning hole 114 can be matched with a positioning column on an external device. After inserting a permanent magnet 2 between each adjacent two iron core units 11, then injecting a material into each injection hole 115, the plurality of iron core units 11 are connected together by the material to form a rotor assembly 10.

[0104] The motor 100 according to the embodiments of the utility model is described below.

[0105] As shown in Figure 1 , the motor 100 according to the embodiments of the utility model includes the above-mentioned rotor assembly 10. The motor 100 of the utility model further includes a stator assembly 20. The rotor assembly 10 is rotatably arranged in the stator assembly 20. The motor 100 is an internal rotor motor 100.

[0106] According to the motor 100 of the embodiment of the utility model, through the above rotor assembly 10, the protrusion 112 is arranged on at least one side of the two sides of the iron core body 111 along the circumferential direction of the rotor assembly 10, the permanent magnet 2 is located on the inner side or the outer side of the protrusion 112 along the radial direction of the rotor assembly 10, the accommodation slot 113 is arranged at the connection of the at least one protrusion 112 and the iron core body 111 and faces the permanent magnet 2, the accommodation slot 113 extends along the axial direction of the rotor assembly 10, the corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, the anti-demagnetization capability of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be improved, the local demagnetization of the permanent magnet 2 is reduced, the anti-demagnetization capability of the motor 100 is improved to a certain extent, and the demagnetization current of the motor 100 is improved. In addition, the use amount of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be increased, the output capability and the efficiency level of the motor 100 are improved, the magnetic bridge width at the protrusion 112 can be reduced, and the magnetic flux leakage is reduced. In addition, the side corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, the chamfering process of the permanent magnet 2 can be omitted, the processing and the size control of the permanent magnet 2 are facilitated.

[0107] The electric appliance according to the embodiment of the utility model is described below.

[0108] The electric appliance according to the embodiment of the utility model comprises the above motor 100. The electric appliance can be an air conditioner, and the motor 100 can be used for driving the rotation of the fan wheel of the air conditioner.

[0109] According to the electric appliance of the embodiment of the utility model, through the above motor 100, the protrusion 112 is arranged on at least one side of the two sides of the iron core body 111 along the circumferential direction of the rotor assembly 10, the permanent magnet 2 is located on the inner side or the outer side of the protrusion 112 along the radial direction of the rotor assembly 10, the accommodation slot 113 is arranged at the connection of the at least one protrusion 112 and the iron core body 111 and faces the permanent magnet 2, the accommodation slot 113 extends along the axial direction of the rotor assembly 10, the corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, the anti-demagnetization capability of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be improved, the local demagnetization of the permanent magnet 2 is reduced, the anti-demagnetization capability of the motor 100 is improved to a certain extent, and the demagnetization current of the motor 100 is improved. In addition, the use amount of the permanent magnet 2 at the corner opposite to the accommodation slot 113 can be increased, the output capability and the efficiency level of the motor 100 are improved, the magnetic bridge width at the protrusion 112 can be reduced, and the magnetic flux leakage is reduced. In addition, the side corner of the permanent magnet 2 opposite to the accommodation slot 113 is a right angle, the chamfering process of the permanent magnet 2 can be omitted, the processing and the size control of the permanent magnet 2 are facilitated.

[0110] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made thereto without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A rotor assembly characterized by, The rotor core comprises a plurality of core units, and each core unit comprises a core body. A plurality of permanent magnets are arranged alternately with the plurality of core bodies in the circumferential direction of the rotor assembly. At least one of the two sides of the core body in the circumferential direction of the rotor assembly is provided with a protrusion, and the permanent magnet is located on the inner side or the outer side of the protrusion in the radial direction of the rotor assembly. The connection between the at least one protrusion and the core body is provided with a clearance slot facing the permanent magnet, and the clearance slot extends in the axial direction of the rotor assembly.

2. The rotor assembly of claim 1, wherein The clearance slot comprises a first slot on the core body and a second slot on the protrusion, and the first slot and the second slot are in communication.

3. The rotor assembly of claim 1, wherein The protrusion comprises a first protrusion, and the clearance slot comprises a first clearance slot.

4. The rotor assembly of claim 3, wherein The first protrusion is located at the outer end of the core body in the radial direction of the rotor assembly, and the permanent magnet is located on the radial inner side of the first protrusion. The connection between the at least one first protrusion and the core body is provided with the first clearance slot facing the permanent magnet, and the corner opposite to the first clearance slot of the permanent magnet is a right angle. The minimum distance between the inner wall of the first clearance slot and the outer wall of the end of the core body away from the axis of the rotor assembly is h2, and h2≥0.5mm is satisfied.

5. The rotor assembly of claim 3, wherein And / or, the minimum distance between the inner wall of the first clearance slot and the outer wall of the end of the core body away from the axis of the rotor assembly is h2, the distance between the inner wall of the part of the first clearance slot on the core body and the side wall of the permanent magnet close to the core body is h1, and 0.25≤h1 / h2≤0.65 is satisfied.

6. The rotor assembly of claim 5, wherein And / or, the radial length of the permanent magnet is L, the radial maximum dimension of the first clearance slot is W2, and 0.1≤W2 / L≤0.16 is satisfied. The core body is provided with the first protrusion on both sides in the circumferential direction of the rotor assembly. The core body comprises first laminations and second laminations alternately stacked in the axial direction of the rotor assembly. The first lamination is provided with a first tab on one side in the circumferential direction of the rotor assembly. The second lamination is provided with a second tab on one side in the circumferential direction of the rotor assembly. The first tab and the second tab are located on both sides of the core body in the circumferential direction of the rotor assembly. The first tab and the first lamination are completely the same as the second tab and the second lamination, respectively.

7. The rotor assembly of claim 3, wherein The iron core body is provided with the first protrusions on both sides in the circumferential direction of the rotor assembly, and comprises a plurality of laminations stacked in the axial direction of the rotor assembly, each of the laminations is respectively provided with a first tab and a second tab on both sides in the circumferential direction of the rotor assembly, a plurality of the first tabs form one of the first protrusions, and a plurality of the second tabs form the other of the first protrusions.

8. The rotor assembly of any one of claims 1-7, wherein, The protrusions comprise second protrusions, the recesses comprise second recesses, the iron core body is provided with the second protrusions on at least one of both sides in the circumferential direction of the rotor assembly, the second protrusions are located at the inner ends of the iron core body in the radial direction of the rotor assembly, the permanent magnet is located radially outward of the second protrusions, at least one of the second protrusions and the iron core body is provided with the second recess toward the permanent magnet, and the opposite corner of the permanent magnet and the second recess is a right angle.

9. The rotor assembly of claim 8, wherein, The minimum width of the iron core body at the position of the second recess is w, and w≥0.5mm is satisfied.

10. The rotor assembly of claim 8, wherein, The iron core body is provided with the second protrusions on both sides in the circumferential direction of the rotor assembly, and comprises first laminations and second laminations alternately stacked in the axial direction of the rotor assembly, the first laminations are provided with third tabs on one side in the circumferential direction of the rotor assembly, the second laminations are provided with fourth tabs on one side in the circumferential direction of the rotor assembly, the third tabs and the fourth tabs are located on both sides of the iron core body in the circumferential direction of the rotor assembly, a plurality of the third tabs form one of the second protrusions, and a plurality of the fourth tabs form the other of the second protrusions.

11. The rotor assembly of claim 10, wherein, The first laminations and the third tabs are completely same as the second laminations and the fourth tabs respectively.

12. The rotor assembly of claim 8, wherein, The iron core body is provided with the second protrusions on both sides in the circumferential direction of the rotor assembly, and comprises a plurality of laminations stacked in the axial direction of the rotor assembly, each of the laminations is respectively provided with a third tab and a fourth tab on both sides in the circumferential direction of the rotor assembly, a plurality of the third tabs form one of the second protrusions, and a plurality of the fourth tabs form the other of the second protrusions.

13. The rotor assembly of claim 1, wherein In the cross section perpendicular to the axial direction of the rotor assembly, the permanent magnet is rectangular, and the corners of the permanent magnet at the extending sides in the axial direction of the rotor assembly are right angles.

14. The rotor assembly of claim 1, wherein At least one of the end faces of the permanent magnet in the axial direction of the rotor assembly has a chamfer between the side wall of the permanent magnet.

15. The rotor assembly of claim 14, wherein, In the circumferential direction of the rotor assembly, the thickness of the magnet is H, The chamfer is a round chamfer, the radius of the round chamfer is R1, and 0.06≤R1 / H≤0.24 is satisfied. Or, the chamfer is a straight edge chamfer, the chamfer size of the straight edge is C1, and 0.06≤C1 / H≤0.24 is satisfied.

16. The rotor assembly of claim 1, wherein In the cross section perpendicular to the axial direction of the rotor assembly, the shape of the recess is circular, elliptical or polygonal.

17. The rotor assembly of claim 1, wherein The iron core body is provided with a positioning hole and an injection hole penetrating through the iron core body in the axial direction of the rotor assembly and a rivet point for connecting a plurality of punched sheets of the iron core body.

18. An electric machine characterized by A rotor assembly comprising any one of the claims 1-17.

19. An electric appliance comprising an electric machine according to claim 18.

Images