Rotor, motor and compressor

Abstract

The invention relates to the technical field of compressors, and discloses a rotor which comprises a rotor iron core and permanent magnets, a plurality of mounting grooves are formed in the rotor iron core in the circumferential direction, two permanent magnets are symmetrically mounted in each mounting groove, the symmetry axis of the two permanent magnets in each mounting groove is set as M1, the center line between every two adjacent mounting grooves is set as M2, a first arc and a second arc are formed on the peripheral surface of the rotor core between the M1 and the M2, the first arc is close to the M1, the second arc is close to the M2, and the radius of the first arc is larger than that of the second arc; the angle of the first arc is theta, the radius of the first arc is R1, the radius of the second arc is R2, the number of the mounting grooves is 2n, and theta * R2 is larger than or equal to 9 degrees * R1 / n and smaller than or equal to 22.5 degrees * R1 / n. The method has the following technical effects: by setting the numerical relationship between the first arc angle and the second arc radius, the excitation magnetic field harmonic wave is weakened, the influence on the fundamental wave is reduced, and the noise is reduced while the motor performance is maintained. The 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 have been increasingly in demand in many industrial applications in recent years due to their high power density, high efficiency, light weight, flexible design, and good reliability, especially in areas closely related to daily life such as automobiles and home appliances. In actual applications, in addition to paying attention to its operating performance, it is also necessary to pay attention to the vibration and noise of the motor. The most widely used in rotary variable frequency compressors is the fractional slot concentrated winding embedded permanent magnet synchronous motor, but due to its rich magnetic field harmonics, the vibration noise it generates also needs to be improved and optimized.

[0003] The noise of the motor mainly comes from the electromagnetic noise caused by the radial electromagnetic vibration of the stator generated by the radial electromagnetic force. Therefore, by reducing the radial electromagnetic force of the motor, especially the low spatial order harmonic components, the electromagnetic vibration noise can be effectively suppressed. Among them, the no-load excitation magnetic field is an important optimization object, and the electromagnetic noise is mainly reduced by weakening the harmonics of the excitation magnetic field. However, the optimization methods commonly used in the prior art will cause the fundamental wave to decrease while weakening the harmonics. Although it can reduce the noise to a certain extent, it will also have an adverse effect on the performance of the motor, which is not conducive to the normal and stable operation of the motor. Summary of the invention

[0004] In order to solve the deficiencies of the prior art, the present invention provides a rotor, which effectively weakens the harmonics of the excitation magnetic field and reduces the influence on the fundamental wave of the excitation magnetic field by setting a first arc and a second arc, and setting the numerical relationship between the first arc angle and the second arc radius, so as to effectively reduce the motor noise while maintaining the 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 a plurality of mounting grooves are arranged on the rotor core in a circumferential direction, and two permanent magnets are symmetrically mounted in each mounting groove, and the symmetry axis of the two permanent magnets in the mounting groove is assumed to be M1, and the center line between two adjacent mounting grooves is assumed to be M2, and both M1 and M2 pass through the axis of the rotor core;

[0007] A first circular arc and a second circular arc are formed on the outer circumferential surface of the rotor core between the M1 and the M2, the first circular arc is connected to the second circular arc, the first circular arc is close to the M1, the second circular arc is close to the M2, and the radius of the first circular arc is greater than the radius of the second circular 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 grooves 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 from 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 the M1 and the 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 width of the first magnetic barrier is the same as that of the second magnetic barrier.

[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, it is assumed that the extended line of the side of the permanent magnet located between the M1 and the M2 close to the M2 is M4, and the distance between the first magnetic barrier and the M4 is equal to the distance between the second magnetic barrier and the 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 the relationship: 1.5≤D1 / D2≤2.5.

[0015] As a further description of the technical solution of the present invention, let the extended line of the side of the permanent magnet located between the M1 and the M2 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 the M2 and the 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 circumference 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 performs arc cutting on the outer peripheral surface of the rotor core by setting the first arc and the second arc, and sets the numerical relationship between the first arc angle and the second arc radius, so that the angle of the first arc and the radius of the second arc are in the optimal range, thereby effectively reducing the influence on the fundamental wave of the excitation magnetic field while weakening the harmonics of the excitation magnetic field. It can effectively reduce the noise of the motor, maintain the normal performance of the motor, and ensure the stable operation of the motor.

[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 the operating performance of the motor from being adversely affected, 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 can reduce the noise generated during the operation of the compressor and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of the cross-sectional structure of a rotor according to Embodiment 1 of the present invention;

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

[0026] Figure 3 is a schematic diagram of the cross-sectional structure of a 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 is a 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 diagram of the structure of the compressor of Example 4 of the present invention.

[0030] Markings in the figure:

[0031] 1. rotor core; 11. mounting groove; 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] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only part of the embodiments of the present invention, not all of them.

[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 claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example 1

[0038] refer to Figure 1 to Figure 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 magnet 2 is a rare earth permanent magnet. Since the magnetic energy product of rare earth permanent magnet materials is relatively high, the use of rare earth permanent magnets is conducive to reducing the volume of the permanent magnet 2, thereby reducing the volume and weight of the rotor. At the same time, rare earth permanent magnets have stable magnetic properties and working performance, which is conducive to improving the performance of the motor.

[0040] Assume that the axis of symmetry of the two permanent magnets 2 in the mounting groove 11 is M1, and the center line between two adjacent mounting grooves 11 is M2, and both M1 and M2 pass through the axis of the rotor core 1. The outer peripheral surface of the rotor core 1 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, the second arc 13 is close to M2, and 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. Assume that the number of mounting grooves 11 is 2n, and the rotor has the relationship: 9°×R1 / n≤θ×R2≤22.5°×R1 / n, wherein 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 by 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. On the contrary, the intensity of 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. It can not only effectively reduce the noise of the motor, but also maintain the normal performance of the motor and ensure the stable operation of the motor.

[0042] Assume that the line from the connection point of the first arc 12 and the second arc 13 to 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 the present embodiment and the motor in the prior art whose rotor core outer circumference is a full circle are respectively tested. During the test, the strength of the no-load excitation magnetic field fundamental wave of the motor equipped with the rotor of the present embodiment is basically consistent with that of the prior art. The numerical results of each harmonic are as follows: 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, which proves that the rotor of this embodiment can effectively weaken the harmonics of the excitation magnetic field while minimizing the impact on the fundamental wave of the excitation magnetic field, which 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 performs arc cutting on the outer peripheral surface of the rotor core by setting the first arc and the second arc, and sets the numerical relationship between the first arc angle and the second arc radius, so that the angle of the first arc and the radius of the second arc are in the optimal range, thereby effectively reducing the influence on the fundamental wave of the excitation magnetic field while weakening the harmonics of the excitation magnetic field. This can effectively reduce the noise of the motor, maintain the normal performance of the motor, and ensure the stable operation of the motor.

[0045] Example 2

[0046] As a further optimization of Example 1, refer to Figure 3 to Figure 4 A magnetic barrier 3 is provided on the rotor core 1 between M1 and M2, and the magnetic barrier 3 is located between the mounting groove 11 and the outer peripheral surface of the rotor core 1. The magnetic barrier 3 includes a first magnetic barrier 31 and a second magnetic barrier 32, the first magnetic barrier 31 is close to M2, the second magnetic barrier 32 is close to M1, and 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, 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. 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 line of the side of the permanent magnet 2 located between M1 and M2 close to M2 is M4, and 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.

[0049] Normally, when the influence of the air gap magnetic intensive component 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 to make it in the optimal range, the magnetic potential tooth harmonics of the armature magnetic field can be effectively weakened, thereby further reducing the lowest order radial electromagnetic force, and then significantly reducing the electromagnetic vibration noise generated by the motor.

[0050] By tracing the harmonic source of low-frequency electromagnetic noise of the motor equipped with the rotor of Example 1, as shown in Table 1, for the lowest order radial electromagnetic force [4,2f 0 The main magnetic potential tooth harmonics with greater influence are [8,f 0 ], for the lowest order radial electromagnetic force [4,4f 0 The main magnetic potential tooth harmonics with greater influence are [16,f 0 ].

[0051] Table 1

[0052]

[0053]

[0054] For magnetic potential tooth harmonics [8,f 0 ] and [16,f 0 ], the armature magnetic field magnetic potential tooth harmonic intensity of the motor with different D1 / D2 values ​​is tested, and the numerical results are as follows Figure 4 As shown. Figure 4 It can be seen that when D1 / D2 is 2, the magnetic potential tooth harmonic [8,f 0 ] and [16,f 0 ] reaches the lowest intensity, 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 line of the side of the permanent magnet 2 located between M1 and M2 close to the outer peripheral surface of the rotor core 1 is set as M5, and the center of the first magnetic barrier 31 and the second magnetic barrier 32 are located at the intersection of M2 and M5. In the series of circles with the center of the first magnetic barrier 31 as the center, the radius of the circle tangent to M1 is set as R3, the radius of the circle tangent to M4 is set as R4, and the width of the first magnetic barrier 31 is set as D3. 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). Preferably, D1 is 0.4×(R3-R4-2×D3); 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 the first magnetic barrier and the second magnetic barrier and setting the positional relationship between the first magnetic barrier and the second magnetic barrier, that is, adjusting the ratio of D1 to D2 to be in 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 reduced to the greatest extent, 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 the performance of the motor.

[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. The inner circumference of the stator core 101 is provided with a plurality of convex teeth 102 at equal intervals along the circumferential direction. A coil is wound around each convex tooth 102, and a through slot 103 is formed between two adjacent convex teeth 102.

[0060] As one implementation manner, 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, and at the same time, avoids the operating performance of the motor from being adversely affected, thereby ensuring the 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 a motor 400 of embodiment 3, and the motor 400 is drivingly connected to the pump 300. The motor 400 drives the pump 300 to operate, so that the compressor can operate stably, and the electromagnetic vibration generated by the motor 400 during operation is relatively weak, which can reduce the mechanical wear of the compressor, extend the service life of the compressor, reduce noise, and enhance the user's sense of use and experience.

[0064] The compressor of this embodiment, by setting 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 clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0066] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0067] In the present invention, unless otherwise clearly specified and 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 not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a 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 a 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 is described in conjunction with the above specific embodiments, it is obvious that those skilled in the art can make many substitutions, modifications and changes according to the above content. Therefore, all such substitutions, improvements and changes are included in 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 arranged on the rotor core (1) along the circumferential direction, and two permanent magnets (2) are symmetrically mounted in each mounting groove (11), and the symmetry axis of the two permanent magnets (2) in the mounting groove (11) is assumed to be M1, and the center line between two adjacent mounting grooves (11) is assumed to be 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 circumferential surface of the rotor core (1) located between the M1 and the M2, the first circular arc (12) is connected to the second circular arc (13), 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.

2. The rotor according to claim 1, characterized in that Assume that a line from the connection point of the first circular arc (12) and the second circular arc (13) to the axis center of the rotor core (1) is M3, the center of the first circular arc (12) coincides with the axis center 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 A magnetic barrier (3) is provided on the rotor core (1) located between the M1 and the M2, and 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 magnetic barrier (3) comprises a first magnetic barrier (31) and a second magnetic barrier (32), wherein the first magnetic barrier (31) is close to the M2, and the second magnetic barrier (32) is close to the M1, and the widths of the first magnetic barrier (31) and the second magnetic barrier (32) are the same.

5. The rotor according to claim 4, characterized in that 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.

6. The rotor according to claim 5, characterized in that Assuming that the extended line of the side of the permanent magnet (2) located between the M1 and the M2 and close to the M2 is M4, the distance between the first magnetic barrier (31) and the M4 is equal to the distance between the second magnetic barrier (32) and the M1; The distance between the first magnetic barrier (31) and the M4 is D1, the distance between the first magnetic barrier (31) and the second magnetic barrier (32) is D2, and the rotor has the relationship: 1.5≤D1 / D2≤2.

5.

7. The rotor according to claim 6, characterized in that Assuming that the extended line of the side of the permanent magnet (2) located between the M1 and the M2 and close to the outer peripheral surface of the rotor core (1) is M5, 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, the radius of the circle tangent to the M1 is R3, the radius of the circle tangent to the M4 is R4, and the width of the first magnetic barrier (31) is D3. 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).

8. The rotor according to claim 7, characterized in that The D3>0.5mm.

9. A motor, characterized in that: The invention comprises a stator (100) and a rotor (200) according to any one of claims 1 to 8, wherein the rotor (200) is arranged in the stator (100), and the stator (100) comprises a stator core (101), wherein the inner circumference of the stator core (101) is provided with a plurality of protruding teeth (102) along the circumferential direction, and a through slot (103) is formed between two adjacent protruding teeth (102).

10. A compressor, characterized in that: It comprises a pump (300) and the motor (400) according to claim 9, wherein the motor (400) is drivingly connected to the pump (300).

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