Rotor, motor and compressor

Abstract

The present invention relates to the field of compressor technology and discloses a rotor comprising a rotor core and permanent magnets. The rotor core is circumferentially provided with multiple mounting slots, each of which is symmetrically mounted with two permanent magnets. The axis of symmetry of the two permanent magnets in the mounting slots is M1, and the centerline between two adjacent mounting slots is M2. A first arc and a second arc are formed on the outer circumferential surface of the rotor core between M1 and M2. The first arc is proximal to M1, and the second arc is proximal to M2. The radius of the first arc is greater than the radius of the second arc. The angle of the first arc is θ, the radius of the first arc is R1, and the radius of the second arc is R2. The number of mounting slots is 2n, where 9°×R1 / n≤θ×R2≤22.5°×R1 / n. The present invention achieves the following technical effects: by setting the numerical relationship between the first arc angle and the second arc radius, the harmonics of the excitation magnetic field are weakened, while reducing their impact on the fundamental wave, thereby reducing noise while maintaining motor performance. The present invention also discloses a motor and a compressor.

Description

Technical Field

[0001] The present invention belongs to the technical field of compressors, and in particular relates to a rotor, a motor and a compressor. Background Art

[0002] Embedded permanent magnet synchronous motors (PMSMs) have seen increasing demand in recent years for their high power density, high efficiency, light weight, flexible design, and excellent reliability in many industrial applications, particularly in areas closely related to daily life, such as automobiles and home appliances. In practical applications, in addition to operational performance, motor vibration and noise also require attention. The most widely used type of embedded permanent magnet synchronous motor with fractional slot concentrated windings in rotary variable-frequency compressors is the most widely used. However, due to its rich magnetic field harmonics, the resulting vibration and noise require improvement and optimization.

[0003] Motor noise primarily originates from electromagnetic noise caused by radial electromagnetic vibrations of the stator generated by radial electromagnetic forces. Therefore, reducing the radial electromagnetic forces, especially the low-order harmonic components, can effectively suppress electromagnetic vibration noise. The no-load excitation magnetic field is a key optimization target, primarily reducing electromagnetic noise by weakening the harmonics of the excitation magnetic field. However, conventional optimization methods used in the prior art reduce the fundamental frequency while simultaneously weakening the harmonics. While this can reduce noise to a certain extent, it can also negatively impact motor performance and hinder normal, stable operation. Summary of the Invention

[0004] To address the shortcomings of the prior art, the present invention provides a rotor that effectively weakens the excitation magnetic field harmonics and reduces the impact on the excitation magnetic field fundamental wave by providing a first arc and a second arc, and by setting a numerical relationship between the first arc angle and the second arc radius. This effectively reduces motor noise while maintaining motor performance. The present invention also provides a motor and a compressor.

[0005] The technical effects to be achieved by the present invention are achieved through the following technical aspects:

[0006] In a first aspect, the present invention provides a rotor comprising a rotor core and a plurality of permanent magnets, wherein the rotor core is provided with a plurality of mounting slots circumferentially, two permanent magnets being symmetrically mounted in each mounting slot, an axis of symmetry between the two permanent magnets in the mounting slot being denoted as M1, a centerline between two adjacent mounting slots being denoted as M2, and both M1 and M2 passing through the axis of the rotor core;

[0007] A first arc and a second arc are formed on the outer circumferential surface of the rotor core between M1 and M2. The first arc is connected to the second arc. The first arc is close to M1, and the second arc is close to M2. The radius of the first arc is greater than the radius of the second arc.

[0008] The angle of the first arc is θ, the radius of the first arc is R1, the radius of the second arc is R2, and the number of the mounting slots is 2n. The rotor has the relationship: 9°×R1 / n≤θ×R2≤22.5°×R1 / n, where n is a positive integer.

[0009] As a further description of the technical solution of the present invention, let the line connecting the connection between the first arc and the second arc to the axis of the rotor core be M3, the center of the first arc coincides with the axis of the rotor core, and the center of the second arc is located on M3.

[0010] As a further description of the technical solution of the present invention, a magnetic barrier is provided on the rotor core located between M1 and M2, and the magnetic barrier is located between the mounting groove and the outer peripheral surface of the rotor core.

[0011] As a further description of the technical solution of the present invention, the magnetic barrier includes a first magnetic barrier and a second magnetic barrier, the first magnetic barrier is close to the M2, the second magnetic barrier is close to the M1, and the first magnetic barrier and the second magnetic barrier have the same width.

[0012] As a further description of the technical solution of the present invention, the first magnetic barrier and the second magnetic barrier are both arc-shaped, the center of the first magnetic barrier coincides with the center of the second magnetic barrier, and the centers of the first magnetic barrier and the second magnetic barrier are located on M2.

[0013] As a further description of the technical solution of the present invention, let the extension line of the side of the permanent magnet located between M1 and M2 close to M2 be M4, and the distance between the first magnetic barrier and M4 is equal to the distance between the second magnetic barrier and M1;

[0014] The distance between the first magnetic barrier and the M4 is D1, the distance between the first magnetic barrier and the second magnetic barrier is D2, and the rotor has a relationship: 1.5≤D1 / D2≤2.5.

[0015] As a further description of the technical solution of the present invention, let the extension line of the side of the permanent magnet located between M1 and M2 on the side close to the outer peripheral surface of the rotor core be M5, and the center of the first magnetic barrier and the second magnetic barrier be located at the intersection of M2 and M5;

[0016] In a series of circles with the center of the first magnetic barrier as the center, let the radius of the circle tangent to the M1 be R3, let the radius of the circle tangent to the M4 be R4, let the width of the first magnetic barrier be D3, and the rotor has the relationship: 0.35×(R3-R4-2×D3)≤D1≤0.45×(R3-R4-2×D3); 0.15×(R3-R4-2×D3)≤D2≤0.25×(R3-R4-2×D3).

[0017] As a further description of the technical solution of the present invention, D3>0.5mm.

[0018] In a second aspect, the present invention provides a motor comprising a stator and a rotor, wherein the rotor is arranged in the stator, and the stator comprises a stator core, wherein the inner periphery of the stator core is provided with a plurality of convex teeth along the circumferential direction, and a through slot is formed between two adjacent convex teeth.

[0019] In a third aspect, the present invention provides a compressor comprising a pump and the motor, wherein the motor is drivingly connected to the pump.

[0020] In summary, the present invention has at least the following benefits:

[0021] The rotor provided by the present invention implements an arc-cutting process on the outer circumference of the rotor core by providing a first arc and a second arc. The numerical relationship between the angle of the first arc and the radius of the second arc is set so that the angle of the first arc and the radius of the second arc are within an optimal range. This effectively reduces the impact on the fundamental wave of the excitation magnetic field while weakening the harmonics of the excitation magnetic field. This effectively reduces the noise of the motor while maintaining normal performance and ensuring stable operation.

[0022] The motor provided by the present invention effectively reduces the electromagnetic vibration noise generated by the motor by providing the above-mentioned rotor, and at the same time avoids adverse effects on the operating performance of the motor, thereby ensuring the normal and stable operation of the motor.

[0023] The compressor provided by the present invention, by providing the above-mentioned motor, can reduce the vibration generated by the motor during operation, thereby reducing mechanical wear, which is beneficial to extending the service life of the compressor. At the same time, it reduces the noise generated during the operation of the compressor and improves the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the cross-sectional structure of the rotor according to embodiment 1 of the present invention;

[0025] Figure 2 Schematic diagram of numerical results of no-load excitation magnetic field harmonics when the rotor of Example 1 of the present invention and the prior art are applied to a motor;

[0026] Figure 3 Schematic diagram of the cross-sectional structure of the rotor according to embodiment 2 of the present invention;

[0027] Figure 4 Schematic diagram of numerical results of armature magnetic field magnetic potential tooth harmonics corresponding to different D1 / D2 values ​​in Example 2 of the present invention;

[0028] Figure 5 Schematic diagram of the cross-sectional structure of a motor according to embodiment 3 of the present invention;

[0029] Figure 6 This is a schematic structural diagram of the compressor of Example 4 of the present invention.

[0030] Markings in the figure:

[0031] 1. Rotor core; 11. Mounting slot; 12. First arc; 13. Second arc;

[0032] 2. Permanent magnet;

[0033] 3. Magnetic barrier; 31. First magnetic barrier; 32. Second magnetic barrier;

[0034] 100, stator; 101, stator core; 102, convex teeth; 103, through slots; 200, rotor; 300, pump; 400, motor. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0036] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0037] Example 1

[0038] refer to Figures 1 to 2 The rotor provided in this embodiment includes a rotor core 1 and a plurality of permanent magnets 2. A plurality of mounting grooves 11 are arranged at equal intervals along the circumferential direction on the rotor core 1. The mounting grooves 11 are V-shaped. Two permanent magnets 2 are symmetrically installed in each mounting groove 11. The two permanent magnets 2 in the same mounting groove 11 form a magnetic pole pair.

[0039] In this embodiment, the permanent magnets 2 are rare earth permanent magnets. Since rare earth permanent magnets have a high magnetic energy product, their use helps reduce the size of the permanent magnets 2, thereby reducing the size and weight of the rotor. Furthermore, rare earth permanent magnets have stable magnetic properties and operating performance, which helps improve the performance of the motor.

[0040] Assume that the axis of symmetry of the two permanent magnets 2 in the mounting slots 11 is M1, and the centerline between two adjacent mounting slots 11 is M2. Both M1 and M2 pass through the axis of the rotor core 1. The outer peripheral surface of the rotor core 1 located between M1 and M2 is formed with a first arc 12 and a second arc 13. The first arc 12 is connected to the second arc 13. The first arc 12 is close to M1, and the second arc 13 is close to M2. The radius of the first arc 12 is greater than the radius of the second arc 13. The angle of the first arc 12 is θ, the radius of the first arc 12 is R1, and the radius of the second arc 13 is R2. Assuming that the number of mounting slots 11 is 2n, the rotor has the relationship: 9°×R1 / n≤θ×R2≤22.5°×R1 / n, where n is a positive integer. Preferably, n≥4.

[0041] By setting the first arc 12 and the second arc 13 between M1 and M2, the outer peripheral surface of the rotor core 1 is cut using the second arc 13 with a small radius. When the angle of the first arc 12 is too large and the radius of the second arc 13 is too small, the outer peripheral surface of the rotor core 1 will be closer to a circle. At this time, although the intensity of the fundamental wave of the excitation magnetic field is large, the intensity of the harmonics will also increase. Conversely, the intensity of both the fundamental wave and the harmonics will decrease. Therefore, by setting the numerical relationship between the angle of the first arc 12 and the radius of the second arc 13 within an optimal range, the harmonics of the excitation magnetic field can be effectively weakened while minimizing the impact on the fundamental wave of the excitation magnetic field. This can effectively reduce the noise of the motor while maintaining the normal performance of the motor and ensuring the stable operation of the motor.

[0042] Assume that the line connecting the connection between the first arc 12 and the second arc 13 and the axis of the rotor core 1 is M3. In some embodiments, the center of the first arc 12 coincides with the axis of the rotor core 1, and the center of the second arc 13 is located on M3.

[0043] The no-load excitation magnetic field harmonics of the motor equipped with the rotor of this embodiment and the motor in the prior art with a fully circular rotor core outer circumference were tested. During the test, the strength of the no-load excitation magnetic field fundamental wave of the motor equipped with the rotor of this embodiment was basically consistent with that of the prior art. The numerical results of each harmonic are shown in FIG. Figure 2 As shown. Figure 2It can be seen that the intensity of each harmonic of the no-load excitation magnetic field of the motor equipped with the rotor of this embodiment is lower than that of the prior art. This proves that the rotor of this embodiment effectively weakens the harmonics of the excitation magnetic field while minimizing the impact on the fundamental wave of the excitation magnetic field. It can not only effectively reduce the electromagnetic vibration noise generated by the motor, but also ensure that the motor maintains normal operating performance.

[0044] The rotor of this embodiment uses a first arc and a second arc to chamfer the outer circumference of the rotor core. The numerical relationship between the angle of the first arc and the radius of the second arc is set so that the angle and radius of the first arc are within an optimal range. This effectively reduces the harmonics of the excitation magnetic field while minimizing the impact on the fundamental wave of the excitation magnetic field. This effectively reduces motor noise while maintaining normal motor performance and ensuring stable operation.

[0045] Example 2

[0046] As a further optimization of Example 1, refer to Figures 3 and 4 Magnetic barriers 3 are provided on the rotor core 1 between M1 and M2, and are located between the mounting slot 11 and the outer circumference of the rotor core 1. Magnetic barriers 3 include a first magnetic barrier 31 and a second magnetic barrier 32. The first magnetic barrier 31 is located near M2, and the second magnetic barrier 32 is located near M1. The first magnetic barrier 31 and the second magnetic barrier 32 have the same width.

[0047] As a further optimization, the first magnetic barrier 31 and the second magnetic barrier 32 are both arc-shaped, with the center of the first magnetic barrier 31 coinciding with the center of the second magnetic barrier 32, and the centers of the first magnetic barrier 31 and the second magnetic barrier 32 located on M2. It should be noted that in some embodiments, the first magnetic barrier 31 and the second magnetic barrier 32 may also be in the shape of multiple segments of an arc.

[0048] Assume that the extended side of permanent magnet 2 located between M1 and M2, closest to M2, is M4. The distance between first magnetic barrier 31 and M4 is equal to the distance between second magnetic barrier 32 and M1. The distance between first magnetic barrier 31 and M4 is D1, and the distance between first magnetic barrier 31 and second magnetic barrier 32 is D2. The rotor has the following relationship: 1.5 ≤ D1 / D2 ≤ 2.5.

[0049] Under normal circumstances, when the influence of the oscine component of the air gap magnetic field is ignored, the radial electromagnetic force mainly comes from the harmonic interaction of the air gap magnetic field, and the lowest-order radial electromagnetic force mainly comes from the interaction between the main pole harmonics of the excitation magnetic field and the tooth harmonics of the armature magnetic field. Tooth harmonics are generally composed of magnetic permeability tooth harmonics and magnetic potential tooth harmonics. The magnetic permeability tooth harmonics are mainly affected by the size of the stator slot, but the stator slot is basically determined by the winding process, while the magnetic potential tooth harmonics can be changed by adjusting the position and distribution of the magnetic barrier 3. The rotor of Example 1 effectively reduces the intensity of the main pole harmonics of the excitation magnetic field by setting the numerical relationship between the angle of the first arc 12 and the radius of the second arc 13. On this basis, by adjusting the ratio of D1 to D2 so that it is in the optimal range, it can effectively weaken the magnetic potential tooth harmonics of the armature magnetic field, thereby further reducing the lowest-order radial electromagnetic force, and thus significantly reducing the electromagnetic vibration noise generated by the motor.

[0050] By tracing the harmonic source of the low-frequency electromagnetic noise of the motor equipped with the rotor of Example 1, as shown in Table 1, the magnetic potential tooth harmonics that have a greater impact on the lowest-order radial electromagnetic force [4, 2f0] are mainly [8, f0], and the magnetic potential tooth harmonics that have a greater impact on the lowest-order radial electromagnetic force [4, 4f0] are mainly [16, f0].

[0051] Table 1

[0052]

[0053]

[0054] For the magnetic potential tooth harmonics [8, f0] and [16, f0], the armature magnetic field magnetic potential tooth harmonic intensity of the motor with different D1 / D2 values ​​is tested. The numerical results are as follows: Figure 4 As shown. Figure 4 It can be seen that when D1 / D2 is 2, the intensity of the magnetic potential tooth harmonics [8, f0] and [16, f0] reaches the lowest. Therefore, the D1 / D2 value is preferably 2, which can minimize the magnetic potential tooth harmonics of the armature magnetic field, effectively reduce the lowest-order radial electromagnetic force, and thus effectively reduce the low-frequency electromagnetic noise of the motor.

[0055] In this embodiment, the extended side of the permanent magnet 2 located between M1 and M2, close to the outer circumference of the rotor core 1, is designated M5. The centers of the first and second magnetic barriers 31 and 32 are located at the intersection of M2 and M5. In a series of circles centered at the center of the first magnetic barrier 31, the radius of the circle tangent to M1 is designated R3, the radius of the circle tangent to M4 is designated R4, and the width of the first magnetic barrier 31 is designated D3. The rotor satisfies the following relationships: 0.35 × (R3 - R4 - 2 × D3) ≤ D1 ≤ 0.45 × (R3 - R4 - 2 × D3); 0.15 × (R3 - R4 - 2 × D3) ≤ D2 ≤ 0.25 × (R3 - R4 - 2 × D3). Preferably, D1 is 0.4 × (R3 - R4 - 2 × D3), and D2 is 0.2 × (R3 - R4 - 2 × D3).

[0056] In this embodiment, D3>0.5mm, thereby reducing magnetic leakage, increasing the magnetic field strength at each point above the magnetic pole, and improving the uniformity of the magnetic field distribution, thereby improving the motor performance.

[0057] The rotor of this embodiment, by providing a first magnetic barrier and a second magnetic barrier and setting the positional relationship between the first and second magnetic barriers, that is, adjusting the ratio of D1 to D2 to be within an optimal range, can effectively weaken the magnetic potential tooth harmonics of the armature magnetic field, further reduce the lowest-order radial electromagnetic force, and thus effectively reduce the electromagnetic vibration noise generated by the motor. By setting the ratio of D1 to D2 to 2, the magnetic potential tooth harmonics of the armature magnetic field can be minimized, effectively reducing the lowest-order radial electromagnetic force, thereby effectively reducing the low-frequency electromagnetic noise of the motor. By setting the width of the first magnetic barrier, the uniformity of the magnetic field distribution can be improved, thereby enhancing motor performance.

[0058] Example 3

[0059] refer to Figure 5 The motor provided in this embodiment includes a stator 100 and a rotor 200 of embodiment 1 or 2. The rotor 200 is arranged in the stator 100. The stator 100 includes a stator core 101. A plurality of protruding teeth 102 are arranged at equal intervals along the circumferential direction on the inner circumference of the stator core 101. A coil is wound around each protruding tooth 102, and a through slot 103 is formed between two adjacent protruding teeth 102.

[0060] As one embodiment, the ratio of the number of through slots 103 to the number of pole pairs of the rotor 200 is 3:2. In this embodiment, the number of through slots 103 is 12, and the number of pole pairs of the rotor 200 is 8.

[0061] The motor of this embodiment, by providing the rotor of embodiment 1 or 2, effectively reduces the electromagnetic vibration noise generated by the motor, while avoiding adverse effects on the operating performance of the motor, thereby ensuring normal and stable operation of the motor.

[0062] Example 4

[0063] refer to Figure 6 The compressor provided in this embodiment includes a pump 300 and the motor 400 of Example 3, wherein the motor 400 is drivingly connected to the pump 300. The motor 400 drives the pump 300, thereby ensuring stable operation of the compressor. Furthermore, the electromagnetic vibration generated by the motor 400 during operation is relatively weak, which not only reduces mechanical wear of the compressor and extends its service life, but also reduces noise, thereby improving the user experience.

[0064] The compressor of this embodiment, by providing the motor of Example 3, can reduce the vibration generated by the motor during operation, thereby reducing mechanical wear, which is beneficial to extending the service life of the compressor. At the same time, it reduces the noise generated during the operation of the compressor and improves the user experience.

[0065] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0066] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0067] In the present invention, unless otherwise expressly specified or limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0068] Although the present invention has been described with reference to the above specific embodiments, it will be apparent to those skilled in the art that many substitutions, modifications, and variations can be made based on the above. Therefore, all such substitutions, modifications, and variations are intended to be encompassed within the spirit and scope of the appended claims.

Claims

1. A rotor, characterized in that: The invention comprises a rotor core (1) and a plurality of permanent magnets (2), wherein a plurality of mounting grooves (11) are provided on the rotor core (1) along the circumferential direction, and two permanent magnets (2) are symmetrically mounted in each mounting groove (11), and the axis of symmetry of the two permanent magnets (2) in the mounting groove (11) is set as M1, and the center line between two adjacent mounting grooves (11) is set as M2, and both M1 and M2 pass through the axis of the rotor core (1); A first circular arc (12) and a second circular arc (13) are formed on the outer peripheral surface of the rotor core (1) located between the M1 and the M2, the first circular arc (12) and the second circular arc (13) are connected, the first circular arc (12) is close to the M1, the second circular arc (13) is close to the M2, and the radius of the first circular arc (12) is greater than the radius of the second circular arc (13); The angle of the first circular arc (12) is θ, the radius of the first circular arc (12) is R1, the radius of the second circular arc (13) is R2, and the number of the mounting grooves (11) is 2n. The rotor has the relationship: 9°×R1 / n≤θ×R2≤22.5°×R1 / n, wherein n is a positive integer; A magnetic barrier (3) is provided on the rotor core (1) between the M1 and the M2, and the magnetic barrier (3) includes a first magnetic barrier (31) and a second magnetic barrier (32); The first magnetic barrier (31) and the second magnetic barrier (32) are both arc-shaped, the center of the first magnetic barrier (31) coincides with the center of the second magnetic barrier (32), and the centers of the first magnetic barrier (31) and the second magnetic barrier (32) are located on M2. The extended line of the side of the permanent magnet (2) located between M1 and M2 close to M2 is assumed to be M4. The distance between the first magnetic barrier (31) and M4 is equal to the distance between the second magnetic barrier (32) and M1. The distance between the first magnetic barrier (31) and M4 is D1, and the distance between the first magnetic barrier (31) and the second magnetic barrier (32) is D2. The rotor has the relationship: 1.5≤D1 / D2≤2.

5.

2. The rotor according to claim 1, characterized in that Assume that the line connecting the connection point of the first circular arc (12) and the second circular arc (13) to the axis of the rotor core (1) is M3, the center of the first circular arc (12) coincides with the axis of the rotor core (1), and the center of the second circular arc (13) is located on M3.

3. The rotor according to claim 1, characterized in that The magnetic barrier (3) is located between the mounting groove (11) and the outer peripheral surface of the rotor core (1).

4. The rotor according to claim 3, characterized in that The first magnetic barrier (31) is close to the M2, the second magnetic barrier (32) is close to the M1, and the first magnetic barrier (31) and the second magnetic barrier (32) have the same width.

5. The rotor according to claim 1, characterized in that Assume that the extended line of the side of the permanent magnet (2) located between the M1 and the M2, which is close to the outer peripheral surface of the rotor core (1), is M5, and the centers of the first magnetic barrier (31) and the second magnetic barrier (32) are located at the intersection of the M2 and the M5; In a series of circles with the center of the first magnetic barrier (31) as the center, let the radius of the circle tangent to the M1 be R3, let the radius of the circle tangent to the M4 be R4, let the width of the first magnetic barrier (31) be D3, and the rotor has the relationship: 0.35×(R3-R4-2×D3)≤D1≤0.45×(R3-R4-2×D3); 0.15×(R3-R4-2×D3)≤D2≤0.25×(R3-R4-2×D3).

6. The rotor according to claim 5, characterized in that The D3>0.5mm.

7. A motor, characterized in that: The invention comprises a stator (100) and a rotor (200) according to any one of claims 1 to 6, wherein the rotor (200) is arranged in the stator (100), and the stator (100) comprises a stator core (101), wherein the inner periphery of the stator core (101) is provided with a plurality of convex teeth (102) along the circumferential direction, and a through slot (103) is formed between two adjacent convex teeth (102).

8. A compressor, characterized in that: It comprises a pump (300) and the motor (400) according to claim 7, wherein the motor (400) is drivingly connected to the pump (300).

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