Magnet, rotor punching sheet, rotor iron core, rotor, motor, compressor and electric appliance

Abstract

The utility model discloses a magnet, a rotor punching sheet, a rotor iron core, a rotor, a motor, a compressor and an electric appliance, and relates to the technical field of motors, the magnet is provided with an inner arc edge and an outer arc edge, and the circle center of the inner arc edge and the circle center of the outer arc edge are located on a straight line where the same radius is located; the distance L1 between the center point of the inner arc edge and the center point of the outer arc edge and the distance L2 between the end point of the inner arc edge and the end point of the outer arc edge meet the condition that L2 is smaller than or equal to L1. According to the technical scheme, the magnetic field intensity can be guaranteed, meanwhile, the iron loss of the motor is reduced, and the efficiency of the motor controller is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a magnet, a rotor punching sheet, a rotor core, a rotor, a motor, a compressor and an electrical appliance. Background Art

[0002] Permanent magnet synchronous motors have been widely used in the fields of household appliances, electric vehicles, etc. due to their excellent performance such as high power density, high efficiency, light weight, small size, simple structure, etc., and have gradually become one of the mainstream drive motors. However, due to the electromagnetic induction effect, core losses such as eddy current loss and hysteresis loss in the core will be caused in the core. These core losses will lead to a decrease in the efficiency of the motor, thereby reducing the output power of the motor and affecting the efficiency of the motor controller. Utility Model Content

[0003] The main purpose of the utility model is to provide a magnet, a rotor punching sheet, a rotor core, a rotor, a motor, a compressor and an electrical appliance, aiming to reduce the iron loss of the motor and improve the efficiency of the motor controller while ensuring the magnetic field strength.

[0004] To achieve the above-mentioned purpose, the utility model proposes a rotor for use in an electric motor, wherein the rotor includes a rotor core and a magnet arranged on the outer surface of the rotor core, wherein the magnet has an inner arc edge and an outer arc edge, and the centers of the inner arc edge and the outer arc edge are located on a straight line with the same radius and are not concentric.

[0005] In one embodiment, the distance L1 between the center point of the inner arc edge and the center point of the outer arc edge, and the distance L2 between the endpoints of the inner arc edge and the endpoints of the outer arc edge satisfy 0.5≤L2 / L1≤1, and L1 satisfies 3mm≤L1≤9mm.

[0006] In one embodiment, the central angle α of the inner arc side and the central angle β of the outer arc side satisfy 1.1≤β / α≤1.5, and the central angle α of the inner arc side satisfies 28°≤α≤38°.

[0007] In one embodiment, the radius R1 of the inner arc edge and the radius R2 of the outer arc edge satisfy 0.5≤R2 / R1≤1.5, and the radius R1 of the inner arc edge satisfies 11mm≤R1≤30mm;

[0008] And / or, the distance d between the centers of the inner arc edge and the outer arc edge satisfies 3mm≤d≤8mm.

[0009] In one embodiment, the magnetization direction of the magnet is the radial direction of the center of the inner arc edge of the magnet.

[0010] The present application also proposes a rotor punching sheet, which is used to form a rotor core that cooperates with the magnet described in any of the above embodiments, and the rotor punching sheet includes:

[0011] A rotor yoke, wherein the rotor yoke is a circular ring structure, and an axial hole is formed inside the rotor yoke; and

[0012] A plurality of positioning protrusions are protrudingly arranged on the outer edge of the rotor yoke and are arranged at intervals along the circumference of the rotor punching sheet. A positioning groove is formed between two adjacent positioning protrusions, and the positioning groove is used to install the magnet.

[0013] In one embodiment, the number of the positioning grooves is an even number.

[0014] In one embodiment, the number of the positioning grooves is ten.

[0015] In one embodiment, the height h of the positioning protrusion satisfies 0<h≤2.5mm;

[0016] And / or, the rotor punching sheet is provided with a countersunk hole, and the shaft hole is located inside the countersunk hole;

[0017] And / or, the rotor yoke is provided with at least two connection holes spaced apart along the circumferential direction.

[0018] The present application also proposes a rotor core, which includes a plurality of rotor punchings as described in any of the aforementioned embodiments, wherein the plurality of rotor punchings are stacked.

[0019] The present application also proposes a rotor, characterized in that it comprises a plurality of magnets as described in any of the aforementioned embodiments and a rotor core as described in the aforementioned embodiments, wherein the magnets are arranged in positioning grooves of the rotor core at intervals along the circumferential direction of the rotor core.

[0020] The present application also proposes a motor, comprising a stator and a rotor as described in the above embodiments.

[0021] The present application also proposes a compressor, comprising the motor as described in the above embodiments.

[0022] The present application also provides an electrical appliance, comprising the compressor as described in the aforementioned embodiment.

[0023] In one embodiment, the electrical appliance is a refrigerator.

[0024] The magnet proposed in the present application can be attached to the outer side of the rotor core to form a rotor. The magnet is roughly an arc-shaped structure, and has an inner arc edge and an outer arc edge that are spaced apart, so that the centers of the inner arc edge and the outer arc edge are located on a straight line with the same radius, and the inner arc edge is not concentric with the outer arc edge, so that the distance between the center point of the inner arc edge and the center point of the outer arc edge is not less than the distance between the end point of the inner arc edge and the end point of the outer arc edge. This arrangement, when the magnet is applied to the rotor, can reduce the air gap magnetic flux harmonic amplitude, thereby reducing the eddy current loss and the core loss such as the hysteresis loss in the core, which can reduce the torque pulsation when the motor is running, make the motor run smoothly, reduce the motor running phase current, thereby reducing the motor iron loss, improve the efficiency of the motor controller, and improve the motor vibration noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 A structural diagram of a rotor embodiment provided in this application;

[0027] Figure 2 A structural diagram of an embodiment of a rotor punching provided in this application;

[0028] Figure 3 A structural diagram of an embodiment of a magnet provided in this application;

[0029] Figure 4 for Figure 3 Schematic diagram of magnetization direction of the middle magnet;

[0030] Figure 5 A structural diagram of an embodiment of a motor provided in this application;

[0031] Figure 6 A schematic diagram of the arrangement of molds on a mold material for an embodiment of a rotor punching provided in the present application.

[0032] Description of Figure Numbers:

[0033] 1. Motor; 100. Rotor; 10. Rotor core; 11. Rotor punching sheet; 111. Rotor yoke; 112. Shaft hole; 113. Positioning groove; 114. Positioning protrusion; 115. Countersunk hole; 116. Connecting hole; 20. Magnet; 21. Inner arc edge; 22. Outer arc edge; 200. Stator; 3. Mould material.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0038] Permanent magnet synchronous motors have been widely used in home appliances, electric vehicles and other fields due to their excellent performance such as high power density, high efficiency, light weight, small size and simple structure, and have gradually become one of the mainstream drive motors. Permanent magnet synchronous motors are divided into two topological structures: built-in type and surface mount type. The built-in rotor structure can make full use of the magnetic resistance torque generated by the asymmetry of the rotor magnetic circuit to improve the power density of the motor. However, at present, due to the electromagnetic induction effect, eddy current loss and hysteresis loss in the core will be caused. These core losses will cause the efficiency of the motor to decrease, thereby reducing the output power of the motor and affecting the efficiency of the motor controller.

[0039] In order to solve the above problems, the present application proposes a magnet 20 applied to the rotor 100 of the motor 1, which can ensure the magnetic field strength while reducing the running phase current of the motor 1, reducing the loss of the motor 1 controller, and further improving the efficiency of the motor 1 controller. At the same time, it can reduce the air gap magnetic density harmonic amplitude, reduce the torque pulsation when the motor 1 is running, and improve the vibration noise of the motor 1.

[0040] See also Figure 1 and Figure 3 In one embodiment of the present application, the magnet 20 is applied to the surface-mounted rotor 100, that is, the magnet 20 is arranged on the outer surface of the rotor core 10, and the rotor core 10 is roughly a cylindrical structure. The magnet 20 has an inner arc edge 21 and an outer arc edge 22, and the centers of the inner arc edge 21 and the outer arc edge 22 are located on a straight line with the same radius and are not concentric.

[0041] Specifically, the magnet 20 is generally in an arc-shaped structure, and is disposed on the outer surface of the rotor core 10 when applied to the rotor 100 ; the rotor 100 is provided with a plurality of magnets 20 along the circumferential direction, and the number of the magnets 20 is usually an even number. Among them, the magnet 20 has an inner arc edge 21 and an outer arc edge 22 arranged at intervals along the radial direction of the rotor 100, the inner arc edge 21 is located in the positioning groove 113 and connected to the rotor core 10, and the outer arc edge 22 can be exposed outside the positioning groove 113; at the same time, the centers of the inner arc edge 21 and the outer arc edge 22 are located on a straight line with the same radius, and the inner arc edge 21 and the outer arc edge 22 are not concentric; when the inner arc edge 21 and the outer arc edge 22 are not concentric, it is necessary to make the center of the outer arc edge 22 of the magnet 20 located on the side of the center of the inner arc edge 21 close to the outer arc edge 22, so that the thickness of the middle part of the magnet 20 is not less than the thickness of the end of the magnet 20; that is, the distance L1 between the center point of the inner arc edge 21 and the center point of the outer arc edge 22 is not less than the distance L2 between the end point of the inner arc edge 21 and the end point of the outer arc edge 22. In this arrangement, when the magnet 20 is applied to the rotor 100, the air gap magnetic flux harmonic amplitude can be reduced, thereby reducing the torque pulsation when the motor 1 is running, making the motor 1 run smoothly, and reducing the operating phase current of the motor 1, thereby reducing the iron loss of the motor 1, improving the control efficiency of the motor 1, and improving the vibration noise of the motor 1.

[0042] Among them, the centers of the inner arc edge 21 and the outer arc edge 22 are located in the same radial direction. This arrangement makes the two sides of the magnet 20 axially symmetrically distributed, and the center of gravity of the magnet 20 and the center of the inner arc edge 21 and the center of the outer arc edge 22 are all located on the same radial straight line of the rotor core 10, which can avoid the problem of unbalanced rotation caused by eccentric mass of the rotor 100 and improve the stability of the rotation process of the motor 1.

[0043] Therefore, it can be understood that the magnet 20 proposed in the present application can be attached to the outer side of the rotor core 10 to form the rotor 100. The magnet 20 is roughly an arc-shaped structure, and has an inner arc edge 21 and an outer arc edge 22 arranged at intervals, so that the centers of the inner arc edge 21 and the outer arc edge 22 are located on a straight line with the same radius, and the inner arc edge 21 and the outer arc edge 22 are not concentric, so that the distance between the center point of the inner arc edge 21 and the center point of the outer arc edge 22 is not less than the distance between the end point of the inner arc edge 21 and the end point of the outer arc edge 22. In this arrangement, when the magnet 20 is applied to the rotor 100, the air gap magnetic flux harmonic amplitude can be reduced, thereby reducing the core loss such as eddy current loss and hysteresis loss in the core, so that the torque pulsation during the operation of the motor 1 can be reduced, the motor 1 can run smoothly, the phase current of the motor 1 can be reduced, thereby reducing the iron loss of the motor 1, improving the control efficiency of the motor 1, and improving the vibration noise of the motor 1.

[0044] See also Figure 3 In one embodiment, the distance L1 between the center point of the inner arc edge 21 and the center point of the outer arc edge 22, and the distance L2 between the endpoints of the inner arc edge 21 and the endpoints of the outer arc edge 22 satisfy 0.5≤L2 / L1≤1, and L1 satisfies 3mm≤L1≤9mm.

[0045] In this embodiment, the radial thickness of the middle part of the magnet 20 at the inner arc edge 21 and the outer arc edge 22 is limited to L1, and the thickness of the end of the magnet 20 is limited to L2, and 0.5≤L2 / L1≤1 is satisfied, wherein the value of L2 / L1 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1 and any value between 0.5 and 1, which is not limited here. Such a setting further reduces the loss of the motor 1 controller, further reduces the magnetic field harmonics, reduces the running torque pulsation of the motor 1, and improves the system efficiency of the motor 1, that is, the controller efficiency.

[0046] At the same time, the thickness of the middle part of the magnet 20, that is, the distance L1 between the center point of the inner arc edge 21 and the center point of the outer arc edge 22, is limited to meet 3mm≤L1≤9mm, where L1 can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm and any value between 3mm and 9mm. At this time, the value of L2 can be calculated based on the above ratio. Among them, if L1 is less than 3mm, the anti-demagnetization ability of the magnet 20 is poor and the magnetic field is weak, and demagnetization is prone to occur, thereby affecting the overall magnetism of the magnet 20, and thus affecting the performance of the motor 1 and shortening the service life of the motor 1; if L1 is greater than 9mm, the size of the magnet 20 is large and the magnetic resistance is large, which is easy to cause the overall size of the motor 1 to increase and increase the manufacturing cost. When L1 is within the value range of 3mm to 9mm, the leakage magnetic flux can be reduced, the magnetic field strength can be guaranteed, and the increase in iron loss caused by excessive magnetic resistance can be avoided, so as to better reduce the running phase current of the motor 1, reduce the loss of the motor 1 controller, and further improve the efficiency of the motor 1 controller.

[0047] See also Figure 3 In some embodiments, the centers of the inner arc edge 21 and the outer arc edge 22 are not concentric. Such a configuration can reduce magnetic field harmonics, reduce the torque pulsation of the motor 1, make the motor 1 run smoothly, reduce the phase current of the motor 1, thereby reducing the iron loss of the motor 1, improve the control efficiency of the motor 1, and improve the vibration noise of the motor 1.

[0048] See also Figure 3 In one embodiment, the central angle α of the inner arc edge 21 and the central angle β of the outer arc edge 22 satisfy 1.1≤β / α≤1.5, and the central angle α of the inner arc edge 21 satisfies 28°≤α≤38°.

[0049] In this embodiment, the center angle α of the inner arc edge 21 is limited to satisfy 28°≤α≤38°, wherein α can be 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, 36°, 37°, 38° and any value between 28° and 38°; at the same time, in the embodiment of the present application, the center angle α of the inner arc edge 21 and the center angle β of the outer arc edge 22 are limited to satisfy 1.1≤β / α≤1.5, so that the center angle of the outer arc edge 22 is greater than the center angle of the inner arc edge 21, and the value of α and the ratio of β / α can be set in the aforementioned range according to actual needs, so as to calculate the value range of β to design the magnet 20. When the center angle of the inner arc edge 21 satisfies the above-mentioned angle range, the amount of magnet 20 can be reduced, the core loss of the motor 1 can be reduced, and the efficiency of the controller of the motor 1 can be improved.

[0050] It can be understood that the magnet 20 of the present application can be combined with the rotor core 10 to form the rotor 100. The magnet 20 needs to be placed in the positioning groove 113 of the rotor punching 11 in the rotor core 10. The center angle of the positioning groove 113 is limited to θ, and at least the center angle α of the inner arc edge 21 should be ≤θ to ensure that the magnet 20 is placed in the positioning groove 113. The inner arc edge 21 of the magnet 20 can be made non-concentric with the rotor core 10, which reduces the amount of magnets used and can also play a role in improving the efficiency of the motor 1 controller.

[0051] See also Figure 3 In one embodiment, the radius R1 of the inner arc edge 21 and the radius R2 of the outer arc edge 22 satisfy 0.5≤R2 / R1≤1.5, and the radius R1 of the inner arc edge 21 satisfies 11mm≤R1≤30mm;

[0052] And / or, the distance d between the centers of the inner arc edge 21 and the outer arc edge 22 satisfies 3mm≤d≤8mm.

[0053] In this embodiment, the radius R1 of the inner arc edge 21 is limited to satisfy 11mm≤R1≤30mm, where R1 can be 11mm, 12mm, 14mm, 15mm, 18mm, 20mm, 22mm, 25mm, 30mm and any value between 11mm and 30mm; at the same time, in the embodiment of the present application, the radius R1 of the inner arc edge 21 and the radius R2 of the outer arc edge 22 are limited to satisfy 0.5≤R2 / R1≤1.5, and the value of R1 and the ratio of R2 / R1 can be set in the above range according to actual needs, so as to calculate the value range of R2 to design the magnet 20. This setting structure can further reduce the amplitude of the air gap magnetic flux harmonics, reduce the torque pulsation when the motor 1 is running, and improve the vibration noise of the motor 1.

[0054] See also Figure 3 In some embodiments, the center distance d between the inner arc edge 21 and the outer arc edge 22 is limited to meet the condition of 3mm≤d≤8mm, and d can be 3mm, 4mm, 5mm, 6mm, 7mm, 8mm and any value between 3mm and 8mm. Such a setting can also limit the thickness of the magnet 20, and avoid the magnet 20 being too large and consumables being too much while ensuring the magnetic field strength.

[0055] Please refer to Figure 4 In some embodiments, the magnetization direction of the magnet 20 is the radial direction of the center of the inner arc edge 21 of the magnet 20. Such a configuration can have a better magnetization effect and improve the magnetization characteristics of the motor 1.

[0056] See also Figure 2The present application also proposes a rotor punching sheet 11, which can be used to form a rotor core 10 that cooperates with the magnet 20 of the above embodiment. The rotor punching sheet 11 includes:

[0057] A rotor yoke 111, wherein the rotor yoke 111 is a circular ring structure, and an axial hole 112 is formed inside the rotor yoke 111; and

[0058] A plurality of positioning protrusions 114 are protrudingly provided on the outer edge of the rotor yoke 111 and are spaced apart along the circumference of the rotor punching 11 , and a positioning groove 113 is formed between two adjacent positioning protrusions 114 .

[0059] The rotor punching 11 of the present application is applied to the motor 1, and a plurality of rotor punchings 11 can be stacked to form a rotor core 10. When the motor 1 is used in a compressor, the rotor core 10 can drive the crankshaft of the compressor to rotate. The rotor punching 11 is made of a material with high magnetic permeability such as a silicon steel sheet, and the rotor punching 11 includes a rotor yoke 111 of a circular ring structure and a plurality of positioning protrusions 114 arranged on the outer edge of the rotor yoke 111. An axial hole 112 is formed on the inner side of the rotor yoke 111, which can be used to insert the crankshaft of the compressor. A plurality of positioning protrusions 114 are arranged at intervals along the circumference of the rotor punching 11, and a positioning groove 113 is formed between any two adjacent positioning protrusions 114. A magnet 20 (such as a magnet) can be embedded in the positioning groove 113 according to the required polarity direction, so that the positioning protrusions 114 can limit and position the magnet 20, thereby avoiding the problem of displacement of the magnet 20 on the circumferential side of the rotor core 10 after the magnet 20 is assembled with the rotor core 10, and ensuring that the magnet 20 is positioned within a certain range.

[0060] In the embodiment of the present application, the protrusion height of the positioning protrusion 114 on the outer edge of the rotor yoke 111 is limited to not exceed the radial thickness of the magnet 20 in the rotor punching 11. Such a configuration can reduce the size of the rotor punching 11 and reduce material usage while ensuring the magnetic field strength and overall structural stability; and reduce the weight of the rotor 100, making the rotor 100 easier to drive and rotate and easier to brake, thereby improving the electrical control efficiency of the motor 1.

[0061] Reference Figure 6As shown, in some embodiments, the rotor punching 11 is formed by stamping, and the silicon steel sheet mold 3 is sequentially stamped by a stamping device to obtain the rotor punching 11. Among them, the mold 3 can be a strip structure, and can be divided into at least two rows of forming areas in the width direction of the mold 3. Each row of forming areas includes a plurality of individual forming molds arranged along the length direction of the mold 3. The film material will be gradually fed into the stamping device along the length direction of the film material, so that each individual forming mold is sequentially stamped to be separated from the mold 3 for processing to form the rotor punching 11; the individual forming molds of the two adjacent rows of forming areas are staggered in the length direction of the mold 3, and each individual forming mold is partially inserted between two individual forming molds of another row of forming areas.

[0062] Among them, the width of the mold 3 is defined as W, the conveying step of the mold 3, that is, the center distance between two molding individual molds in the same row of molding areas, is J1, and the minimum distances between the two sides of the mold 3 in the width direction and the molding individual films on the adjacent molding areas are defined as b1 and b2, b1 satisfies 0mm≤b1≤3mm, and b2 satisfies 0mm≤b2≤3mm. In addition, the minimum distance between two molding individual molds in the same row of molding areas in the length direction of the mold 3 is defined as J2, and satisfies 0mm≤J2≤3mm; the minimum distance between two adjacent molding individual molds in two rows of molding areas is defined as J3, and satisfies 0mm≤J3≤3mm. With such a setting, the mold row size of the rotor punching sheet 11 can be reduced to make full use of the mold 3 and reduce material waste.

[0063] Taking the example of dividing the mold 3 into two rows of forming areas, when the size of the magnet 20 and the size of the positioning protrusion 114 in the aforementioned embodiment are met, the width of the mold 3 can be W, which satisfies 42mm≤W1≤50mm, and the conveying step distance of the mold 3, that is, the center distance between the two individual molds in the same row of forming areas, is J1, which satisfies 80mm≤J1≤95mm, which can save more than 45% of the mold 3.

[0064] See also Figure 2 In one embodiment, the height h of the positioning protrusion 114 satisfies 0<h≤2.5mm.

[0065] It can be understood that the positioning protrusion 114 provided on the outer edge of the rotor yoke 111 is used to position the magnet 20, so as to avoid the problem of the magnet 20 being offset on the outer periphery of the rotor core 10. In the embodiment of the present application, the height h of the positioning protrusion 114 is limited to not more than 2.5 mm, wherein h can be 0.1 mm, 0.2 mm, 0.5 mm, 0.7 mm, 0.9 mm, 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2.0 mm, 2.1 mm, 2.3 mm, 2.5 mm and any value between 0 and 2.5 mm. In this way, the magnet 20 can be limited and positioned, and the rotor punching 11 and the rotor core 10 can be prevented from being oversized, and the material usage of the rotor punching 11 and the material waste during the stamping production of the rotor punching 11 can be reduced. In actual application, the height of the positioning protrusion 114 can be defined according to actual conditions; for example, the positioning protrusions 114 at both ends of the positioning groove 113 can be limited to not exceed the tangent range of the center point of the bottom wall of the positioning groove 113. Of course, part of the positioning protrusion 114 can also exceed a certain range of the aforementioned tangent to limit the height of the positioning protrusion 114.

[0066] In addition, the diameter of the rotor punching 11 can be defined as D1, and the diameter of the circle with the line connecting the center of the rotor punching 11 and the highest point of the positioning protrusion 114 as the radius is D2. At this time, the height of the positioning protrusion 114 roughly satisfies h=(D2-D1) / 2, and satisfies 0<D2-D1≤5mm.

[0067] See also Figure 1 and Figure 2 In one embodiment, the number of the positioning grooves 113 is an even number. This arrangement can make the rotor 100 have good polar symmetry, uniform magnetic field distribution, reduce torque pulsation during operation of the motor 1, stabilize the torque of the motor 1, and reduce operating noise.

[0068] Furthermore, in some embodiments, the number of positioning grooves 113 is 10. In this case, the central angle α of the inner arc edge 21 of the magnet 20 and the central angle β of the outer arc edge 22 can satisfy 1.1≤β / α≤1.5, and the central angle α of the inner arc edge 21 satisfies 28°≤α≤38°. This can reduce the amount of magnet 20 used, reduce the core loss of the motor 1, and improve the efficiency of the controller of the motor 1 while ensuring the magnetic field strength and torque stability.

[0069] See also Figure 2In one embodiment, the rotor yoke 111 is provided with a countersunk hole 115, and the axial hole 112 is located in the area of ​​the countersunk hole 115; the motor 1 using the rotor punching 11 of the present application can be used in a compressor, and the crankshaft of the compressor is passed through the axial hole 112 of the rotor punching 11. The countersunk hole 115 on the rotor punching 11 can be used to accommodate a crankcase, and the crankcase can be interference fit with the countersunk hole 115; such a setting can improve the connection strength between the crankshaft and the rotor 100, so that the rotor 100 can drive the crankshaft to rotate more stably, thereby improving the transmission stability.

[0070] See also Figure 2 In one embodiment, the rotor yoke 111 is provided with at least two connection holes 116 spaced apart along the circumferential direction of the rotor punching 11. It can be understood that the rotor core 10 of the motor 1 is composed of a plurality of rotor punchings 11 stacked together, and the connection holes 116 are provided in the rotor yoke 111 of the rotor punching 11. When a plurality of rotor punchings 11 are stacked together, the connection holes 116 on each rotor punching 11 are arranged opposite to the connection holes 116 of at least another rotor punching 11, and can be used to penetrate a connection member for connecting at least two rotor punchings 11; for example, a rivet can be used as a connection member to rivet at least two rotor punchings 11 together.

[0071] Furthermore, the rotor yoke 111 is provided with at least two connecting holes 116, and the center of each connecting hole 116 is located on the same pitch circle with the center of the rotor punching 11 as the center; in this arrangement, each rotor punching 11 has at least two connection positions with other rotor punchings 11, which can improve the connection strength and the overall structural strength of the rotor core 10.

[0072] The present application also proposes a rotor core 10, comprising a plurality of rotor punchings 11 arranged in a stacked manner; the specific structure of the rotor punchings 11 refers to any of the above-mentioned embodiments. Since the rotor core 10 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0073] In one embodiment, the rotor punching 11 is provided with a connecting hole 116. When a plurality of rotor punchings 11 are stacked, the connecting hole 116 on each rotor punching 11 is arranged opposite to the connecting hole 116 of at least another rotor punching 11, and can be used to penetrate a connecting piece for connecting at least two rotor punchings 11; for example, a rivet can be used as a connecting piece to rivet at least two rotor punchings 11 together.

[0074] See also Figure 1The present application also proposes a rotor 100, comprising a rotor core 10 and a plurality of magnets 20, wherein the plurality of magnets 20 are arranged at intervals along the circumferential direction of the rotor core 10 on the circumferential side of the rotor core 10; wherein the rotor core 10 is the rotor core 10 as described in the aforementioned embodiments, and the magnets 20 are the magnets 20 as described in any of the aforementioned embodiments.

[0075] Since the rotor 100 adopts the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which are not described in detail here.

[0076] See also Figure 5 The present application also proposes a motor 1, comprising a stator 200 and a rotor 100 as described in the above-mentioned embodiments. The stator 200 is formed with an inner bore, and the stator 200 can be formed by stacking a plurality of stator punching sheets, and the stator punching sheets include a stator yoke and a plurality of stator teeth. The stator teeth are distributed on the stator yoke so that they are evenly distributed around the axis of the stator 200 iron core. A winding slot is formed between any two adjacent stator teeth so that the winding coil can be wound on the stator teeth. The specific structure of the rotor 100 refers to any of the above-mentioned embodiments, and the rotor 100 is located in the inner bore of the stator 200 and can rotate relative to the stator 200. Since the motor 1 adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, which will not be repeated here one by one.

[0077] The present application also proposes a compressor, including the motor 1 as described in the above embodiment. The specific structure of the motor 1 refers to any of the above embodiments. Since the compressor adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here. Among them, the compressor also includes a pump body, and the output end of the motor 1 is connected to the crankshaft of the pump body. The crankshaft of the pump body compresses the refrigerant when working. The compressor can be used in refrigeration appliances such as refrigerators and air conditioners, and can also be used in appliances that take into account both refrigeration and heating.

[0078] The present application also proposes an electrical appliance, including a compressor as described in the above embodiments. The specific structure of the compressor refers to any of the above embodiments. Since the electrical appliance adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the electrical appliance can be a refrigeration appliance such as a refrigerator, an air conditioner, or other electrical appliances that take into account both refrigeration and heating.

[0079] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A magnet used in a rotor of a motor, the rotor comprising a rotor core and the magnet disposed on the outer surface of the rotor core, characterized in that: The magnet has an inner arc edge and an outer arc edge, and the centers of the inner arc edge and the outer arc edge are located on a straight line with the same radius and are not concentric.

2. The magnet according to claim 1, characterized in that The distance L1 between the center point of the inner arc edge and the center point of the outer arc edge, and the distance L2 between the endpoints of the inner arc edge and the endpoints of the outer arc edge satisfy 0.5≤L2 / L1≤1, and L1 satisfies 3mm≤L1≤9mm.

3. The magnet according to claim 1, characterized in that The central angle α of the inner arc side and the central angle β of the outer arc side satisfy 1.1≤β / α≤1.5, and the central angle α of the inner arc side satisfies 28°≤α≤38°.

4. The magnet according to claim 1, characterized in that The radius R1 of the inner arc edge and the radius R2 of the outer arc edge satisfy 0.5≤R2 / R1≤1.5, and the radius R1 of the inner arc edge satisfies 11mm≤R1≤30mm; And / or, the distance d between the centers of the inner arc edge and the outer arc edge satisfies 3mm≤d≤8mm.

5. The magnet according to any one of claims 1 to 4, characterized in that The magnetization direction of the magnet is the radial direction of the center of the inner arc edge of the magnet.

6. A rotor punching sheet for forming a rotor core matched with the magnet according to any one of claims 1 to 5, characterized in that: The rotor punching sheet comprises: A rotor yoke, wherein the rotor yoke is a circular ring structure, and an axial hole is formed inside the rotor yoke; and A plurality of positioning protrusions are protrudingly arranged on the outer edge of the rotor yoke and are arranged at intervals along the circumference of the rotor punching sheet. A positioning groove is formed between two adjacent positioning protrusions, and the positioning groove is used to install the magnet.

7. The rotor punching according to claim 6, characterized in that: The number of the positioning grooves is an even number.

8. The rotor punching according to claim 7, characterized in that: The number of the positioning grooves is 10.

9. A rotor lamination as claimed in any one of claims 6 to 8, characterized in that The height h of the positioning protrusion satisfies 0<h≤2.5mm; And / or, the rotor punching sheet is provided with a countersunk hole, and the shaft hole is located inside the countersunk hole; And / or, the rotor yoke is provided with at least two connection holes spaced apart along the circumferential direction.

10. A rotor core, characterized in that: The rotor core comprises a plurality of rotor sheets as claimed in any one of claims 6 to 9, wherein the plurality of rotor sheets are stacked.

11. A rotor, characterized in that: The invention comprises a plurality of magnets according to any one of claims 1 to 5 and a rotor core according to claim 10, wherein the magnets are arranged in positioning grooves of the rotor core at intervals along the circumferential direction of the rotor core.

12. A motor, characterized in that: It comprises a stator and a rotor as claimed in claim 11.

13. A compressor, characterized in that: Comprising the motor as claimed in claim 12.

14. An electrical appliance, characterized in that: Comprising the compressor of claim 13.

15. The electrical appliance according to claim 14, characterized in that The electrical appliance is a refrigerator.

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