Rotor lamination, rotor, electric machine and compressor

Abstract

The application provides a rotor lamination, a rotor, a motor and a compressor. The rotor lamination is formed with a through hole, and the width of the part of the through hole extending from a first end to a second end gradually decreases. The structure of the rotor is optimized. When the rotor operates, the second end of the through hole can absorb the energy of the vibration of the rotor lamination, reduce the noise generated by the vibration of the rotor, and the noise reduction effect is obvious. When viewed along the axial direction of the rotor lamination, the through hole is in a wedge-shaped structure and is arranged by using the acoustic black hole principle, so that the propagation speed of sound waves can be reduced, supersonic speed can be converted into subsonic waves, and waves in a wide frequency band can be gathered in a region with small width. When the rotor lamination is applied to the compressor, the effect of wide-frequency vibration is achieved, which is beneficial to attenuate the medium-high-frequency vibration, suppress the vibration response of the rotor, so that the vibration of the rotor during operation can be reduced, and then the working noise of the compressor can be reduced, and the comfort of use is improved. The resonance problem of the rotor and the pump body of the compressor is avoided, and the reliable operation of the motor and the pump body is ensured.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, and particularly relates to a rotor lamination, a rotor, a motor, and a compressor. Background Technology

[0002] The rotor is the rotating component of an electric motor, used to convert electrical energy into mechanical energy. The rotor core is formed by stacking multiple rotor laminations, and the structure of these laminations directly affects the motor's noise level and lifespan. During motor operation, an air gap magnetic field is formed in the air gap between the stator and rotor. This air gap magnetic field is a rotating or pulsating force wave that generates alternating electromagnetic forces distributed according to the pole pair number in the air gap. Simultaneously, it exerts magnetic pull on the stator and rotor, causing deformation and periodic vibration, thus generating noise. Rotor vibration is a significant cause of motor noise. In existing motors, due to unreasonable rotor lamination structural design, the manufacturing process is complex, noise reduction effects are insignificant, and motor operation is unstable. Summary of the Invention

[0003] In view of this, the present invention provides a rotor lamination, a rotor, a motor and a compressor to solve the problems in the prior art, such as complex processing, insignificant noise reduction effect and unstable motor operation caused by unreasonable structural design of rotor lamination.

[0004] The present invention provides a rotor lamination having a through hole; the through hole has a first end and a second end, the first end and the second end having a positional difference at least in the circumferential direction of the rotor lamination, and the width of the through hole gradually decreases from the first end to the second end.

[0005] Further optionally, the through hole includes an inner arc segment and an outer arc segment, the inner arc segment being close to the center of the rotor lamination and the outer arc segment being far from the center of the rotor lamination; the distance between the inner arc segment and the outer arc segment is the width of the through hole.

[0006] Further optionally, when both the inner arc segment and the outer arc segment are circular arcs, the inner arc segment is concentric with the rotor lamination, and the outer arc segment is not concentric with the rotor lamination; satisfying 8≤α / L≤13, where α is the central angle of the inner arc segment and L is the width of the through hole at the first end.

[0007] Further optionally, the through hole includes an inner straight segment and an outer straight segment, the inner straight segment being close to the center of the rotor lamination and the outer straight segment being far from the center of the rotor lamination; the distance between the inner straight segment and the outer straight segment is the width of the through hole.

[0008] Alternatively, the through hole has a wedge-shaped structure when viewed along the axial direction of the rotor lamination.

[0009] Alternatively, when viewed along the axial direction of the rotor lamination, the wedge-shaped structure is an acoustic black hole structure.

[0010] Further optionally, along the extension direction of the through hole, the width of the through hole gradually decreases according to a power exponent curve H until it decreases to zero; satisfying h = a * xm, where a rectangular coordinate system is established with the point where h = 0 as the origin O, the rectangular coordinate system includes an X-axis and a Y-axis, the X-axis is set horizontally, and the Y-axis is set vertically; a vertical reference line M is drawn through any point on the wall of the through hole, and the intersection points between the reference line M and the wall of the through hole are points M1 and M2, respectively, and h is the distance between points M1 and M2; a horizontal reference line N is drawn through any point on the wall of the through hole, and the intersection points between the reference line N and the Y-axis are points N1, respectively, and x is the distance between points N1 and M2; a is a constant and a > 0, m is a power exponent and m ≥ 2.

[0011] Alternatively, the through hole is quadrilateral in shape when viewed along the axial direction of the rotor lamination.

[0012] Further optionally, the through holes include a plurality of through holes, which are arranged sequentially along the circumference of the rotor lamination; the arrangement direction of the plurality of through holes from the first end to the second end is consistent, and the arrangement direction is clockwise or counterclockwise.

[0013] The present invention also provides a rotor comprising the rotor laminations described in any of the preceding claims, wherein the rotation direction of the rotor is designed to be consistent with the arrangement direction of the first and second ends of the through hole.

[0014] The present invention also provides an electric motor, the electric motor comprising the rotor described above.

[0015] The present invention also provides a compressor, the compressor including the motor described above.

[0016] Compared with the prior art, the main advantages of the present invention are as follows:

[0017] (1) The rotor structure was optimized, the processing was simple and the cost was low. The width of the through hole gradually decreased from the first end to the second end, which reduced the noise caused by rotor vibration. The noise reduction effect was obvious and the reliable operation of the motor was guaranteed.

[0018] (2) The through hole is a wedge-shaped structure and is set according to the acoustic black hole principle, which can reduce the propagation speed of sound waves and convert supersonic waves into subsonic waves. In this way, the wide-band waves are concentrated in a small area on a certain spatial scale, which plays a role in suppressing sound radiation, significantly reducing the vibration response of the rotor, and achieving a good noise reduction effect.

[0019] (3) When the rotor laminations are applied to the compressor, the second end of the through hole can absorb the energy of vibration and achieve the effect of wide frequency vibration. This is beneficial to attenuate medium and high frequency vibrations and suppress the vibration response of the rotor, thereby reducing the vibration of the rotor during operation, thus reducing the working noise of the compressor and improving the comfort of use; avoiding the resonance problem between the rotor and the compressor pump body, and ensuring the reliable operation of the motor and pump body. Attached Figure Description

[0020] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0021] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which the present invention can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that the present invention can produce, should still fall within the scope of the technical content disclosed in the present invention.

[0022] Figure 1 This is a schematic diagram of an embodiment of the rotor lamination provided by the present invention;

[0023] Figure 2a and Figure 2b for Figure 1 Enlarged view of point C in the middle;

[0024] Figure 3 and Figure 4 This is a schematic diagram of another embodiment of the rotor lamination provided by the present invention;

[0025] Figure 5 for Figure 3 Enlarged view of point D in the middle;

[0026] In the picture:

[0027] 11-Rotor lamination; 12-Through hole; 121-First end; 122-Second end; 123-Inner arc segment; 124-Outer arc segment. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0030] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0031] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0032] When a motor is running, an air gap magnetic field is formed in the air gap space between the stator and the rotor. The air gap magnetic field is a rotating or pulsating force wave that generates alternating electromagnetic forces, distributed according to the number of pole pairs in the air gap space. At the same time, it generates magnetic pull on the stator and rotor, causing the stator and rotor to deform and vibrate periodically, generating noise. The vibration of the rotor is an important cause of motor noise. In existing motors, due to unreasonable structural design of the rotor laminations, the manufacturing process is complicated, the noise reduction effect is not obvious, and the motor operation is unstable.

[0033] The present invention creatively provides a rotor lamination having a through hole; the through hole is formed at a first end and a second end, the first end and the second end having a positional difference at least in the circumferential direction of the rotor lamination, and the width H of the through hole extending from the first end to the second end gradually decreases;

[0034] The rotor structure has been optimized. When the rotor is running, the through holes can absorb the energy of the rotor lamination vibration, suppress the rotor vibration response, and reduce the noise generated by rotor vibration, resulting in a significant noise reduction effect.

[0035] Example 1

[0036] like Figure 1 and Figure 2a As shown, this embodiment provides a rotor lamination 11, which has a through hole 12. The through hole 12 forms a first end and a second end, and extends along the circumferential direction of the rotor lamination 11. The width of the through hole 12 gradually decreases from the first end 121 to the second end 122. Specifically, the width of the through hole 12 from the first end 121 to the second end 122 is h. A rectangular coordinate system is established with the point h = 0 as the origin O. The rectangular coordinate system includes an X-axis and a Y-axis. The X-axis is set horizontally, and the Y-axis is set vertically. A reference line M is drawn through any point on the wall of the through hole 12. The reference line M is parallel to the Y-axis. The intersection points between the reference line M and the wall of the through hole 12 are points M1 and M2, respectively, and h is the distance between points M1 and M2.

[0037] In summary, the rotor structure has been optimized, the processing is simple and the cost is low. When the rotor is running, the through holes can absorb the energy of the rotor lamination vibration, achieve the effect of wide-frequency vibration, suppress the rotor vibration response, reduce the noise generated by rotor vibration, and have a significant noise reduction effect, ensuring the reliable operation of the motor. The through holes extend along the circumferential direction of the rotor lamination, expanding the coverage area for absorbing rotor lamination vibration and improving the noise reduction effect.

[0038] Furthermore, such as Figure 1 As shown, when viewed along the axial direction of the rotor lamination 11, the through hole 12 has a wedge-shaped structure; preferably, when viewed along the axial direction of the rotor lamination 11, the through hole 12 has an acoustic black hole structure.

[0039] It can reduce the propagation speed of sound waves, converting supersonic waves into subsonic waves, thereby concentrating broadband waves into a smaller area on a certain spatial scale, which can suppress sound radiation, significantly reduce the vibration response of the rotor, and achieve good noise reduction effect.

[0040] It should be noted that the structure of the through hole 12 is not limited and can be set according to actual needs.

[0041] The through-hole 12 includes a first end 121 and a second end 122. The width of the through-hole 12 at the first end 121 is greater than the width of the through-hole 12 at the second end 122. To address the issue of the through-hole 12's insignificant noise reduction effect, this embodiment further proposes that, based on the acoustic black hole effect, along the extension direction of the through-hole 12, the width of the through-hole 12 gradually decreases according to a power-law curve H until it decreases to zero, satisfying h = a*x. mIn this system, a rectangular coordinate system is established with the origin O at h = 0. The rectangular coordinate system includes an X-axis and a Y-axis, with the X-axis set horizontally and the Y-axis set vertically. A vertical reference line M is drawn through any point on the wall of the through hole 12. The intersection points of the reference line M and the wall of the through hole 12 are points M1 and M2, respectively, and h is the distance between points M1 and M2. A horizontal reference line N is drawn through any point on the wall of the through hole 12. The intersection points of the reference line N and the Y-axis are points N1 and N2, respectively, and x is the distance between points N1 and M2. a is a constant and a > 0, and m is a power exponent and m ≥ 2.

[0042] Specifically, the power exponent curve is h = 2x 2 When x = 2mm, h = 8mm; it can be seen that the further away from the first end 121 of the through hole 12, the smaller the width of the through hole 12 becomes, and it changes in a power-law decreasing form; since the width of the through hole 12 changes in a power-law manner, the region where the width of the through hole 12 changes in a power-law manner can also be understood as the acoustic black hole region. The acoustic black hole effect utilizes the power-law changes of the geometric parameters or material property parameters of the thin-walled structure to gradually reduce the propagation speed of the wave in the acoustic black hole region. In ideal conditions, the wave speed can be reduced to zero, thus preventing reflection; the acoustic black hole can concentrate the wave energy propagating in the structure at a specific location, thus having a significant advantage in the application of vibration reduction and noise reduction of thin-walled structures. The acoustic black hole has the characteristics of wide bandwidth efficiency, simple and flexible implementation method for wave concentration;

[0043] Based on the acoustic black hole effect, it can be understood that the through hole 12 adopts an acoustic black hole structure. The width of the through hole 12 is distributed according to the law of gradually decreasing power exponent. Therefore, the through hole 12 can reduce the propagation speed of waves in the structure and convert supersonic waves into subsonic waves. Thus, it can concentrate broadband waves in the region where the structure thickness decreases on a certain spatial scale, thereby suppressing sound radiation in the structure. It can significantly reduce the vibration response of the rotor assembly and obtain a good noise reduction effect.

[0044] Understandably, the smaller the width of the through hole 12, the better the acoustic black hole effect it can achieve; the wider the through hole 12 is, the better the acoustic black hole effect it can achieve. However, considering the limitations of the process and manufacturing, the current process cannot achieve particularly fine precision. Therefore, in actual manufacturing, the width of the second end 122 of the through hole 12 is set to be equal to or slightly greater than 0.1mm. For example, if the width of the second end 122 of the through hole 12 is set to 0.1mm, the above-mentioned dimensions of the through hole 12 can be achieved using existing processes, and the through hole 12 can achieve a good vibration reduction effect. It should be noted that setting the width of the second end 122 of the through hole 12 to be less than 0.1mm is also feasible.

[0045] In addition, in some embodiments, the through hole 12 extends circumferentially along the rotor lamination 11, which can surround the inner hole of the rotor. The through hole 12 extends a relatively long circumferentially along the rotor lamination 11, which is beneficial to improving the vibration reduction effect.

[0046] Furthermore, such as Figure 2a and Figure 2b As shown, the through hole 12 includes an inner arc segment 123 and an outer arc segment 124. The inner arc segment 123 is close to the center of the rotor lamination 11, and the outer arc segment 124 is far from the center of the rotor lamination 11. The distance between the inner arc segment 123 and the outer arc segment 124 is the width of the through hole 12. The inner arc segment 123 and the outer arc segment 124 are separated at the first end 121 and intersect at the second end 122.

[0047] like Figure 2b As shown, further, when the inner arc segment 123 is a circular arc and the outer arc segment 124 is a circular arc, the inner arc segment 123 is concentric with the rotor lamination 11, and the outer arc segment 124 is not concentric with the rotor lamination 11; satisfying 8≤α / L≤13, where α is the central angle of the inner arc segment 123 and L is the width of the through hole 12 at the first end 121.

[0048] Furthermore, while ensuring the structural strength of the rotor lamination 11, multiple through holes 12 are provided, which are arranged sequentially along the circumference of the rotor lamination 11, thereby improving the noise reduction effect of the through holes 12. The arrangement direction of the multiple through holes 12 from the first end 121 to the second end 122 is consistent, and the arrangement direction of the multiple through holes 12 from the first end 121 to the second end 122 is clockwise, or the arrangement direction of the multiple through holes 12 from the first end 121 to the second end 122 is counterclockwise.

[0049] In this embodiment, the arrangement direction of the multiple through holes 12 from the first end 121 to the second end 122 is counterclockwise. When the rotor is running, the second end of the multiple through holes 12 absorbs the vibration of the rotor laminations 11, thereby suppressing the vibration response of the rotor. The multiple rotor laminations 11 are connected in a stacked manner to form a rotor.

[0050] This embodiment also provides a rotor, which includes the rotor laminations described in any of the above claims, and the rotation direction of the rotor is designed to be consistent with the arrangement direction of the first end 121 and the second end 122 of the through hole 12.

[0051] Specifically, when the arrangement direction of multiple through holes 12 from the first end 121 to the second end 122 is clockwise, the rotation direction of the rotor is designed to be clockwise; during the rotor rotation, the airflow is clockwise from the first end 121 to the second end 122 of the through hole 12, resulting in the best noise reduction effect.

[0052] When the arrangement direction of multiple through holes 12 from the first end 121 to the second end 122 is counterclockwise, the rotation direction of the rotor is designed to be counterclockwise. During the rotor rotation, the airflow is counterclockwise from the first end 121 to the second end 122 of the through hole 12, resulting in the best noise reduction effect.

[0053] This embodiment also provides an electric motor, which includes the rotor described above;

[0054] This embodiment also provides a compressor, including a pump body assembly and the aforementioned motor; the pump body assembly and the motor are installed in the inner cavity of the housing; specifically, the pump body assembly is located at the lower end of the inner cavity, and the pump body assembly includes a cylinder, an upper flange, a lower flange, a muffler, and a crankshaft; the motor is located at the upper end of the inner cavity, and the motor includes a rotor and a stator, the stator is fixed to the wall of the inner cavity, and the rotor can rotate relative to the stator; the rotor is connected to one end of the crankshaft, and the rotor can drive the crankshaft to rotate.

[0055] The upper flange is fitted onto the upper end face of the cylinder, and the lower flange is fitted onto the lower end face of the cylinder, thus forming a compression chamber inside the cylinder. A muffler is installed on the upper end of the upper flange to reduce airflow noise generated when the compression chamber is venting. A roller is fitted on the other end of the crankshaft. The roller is located inside the compression chamber and rotates eccentrically within the compression chamber under the drive of the crankshaft, causing the working volume of the compression chamber to change periodically. The roller and the mating vane divide the compression chamber into a low-pressure chamber and a high-pressure chamber. The compressor usually also has a distributor, which is connected to the pump assembly to provide refrigerant to the pump assembly. The crankshaft rotates under the drive of the rotor, enabling the pump assembly to complete the processes of intake, compression, and exhaust. After being compressed by the pump assembly, the refrigerant is discharged through the exhaust pipe of the housing and then enters the refrigeration unit for circulation.

[0056] The vibration of the pump body assembly is transmitted to the rotor lamination 11 through the crankshaft, and then to the through hole 12. The second end 122 of the through hole 12 can absorb the vibration energy and dissipate the rotor vibration energy, achieving a wide-frequency vibration effect. This is beneficial for attenuating medium and high frequency vibrations, reducing the medium and high frequency noise generated by the rotor due to vibration, and suppressing the rotor's vibration response. This reduces the vibration of the rotor during operation, thereby reducing the operating noise of the compressor and improving user comfort. It also avoids the resonance problem between the rotor and the compressor pump body, ensuring the reliable operation of the motor and pump body.

[0057] Specifically, when vibration is transmitted from the rotor lamination 11 to the second end 122 of the through hole 12, the wave velocity of the vibration decreases as the width of the through hole 12 gradually decreases, thus concentrating the wave. At the same time, according to the law of conservation of energy, the wave amplitude of the vibration increases, thereby rapidly dissipating the energy of the vibration. Especially for mid-to-high frequency vibrations, the gradually decreasing width of the through hole 12 results in better vibration absorption at the second end 122 of the through hole 12, which can effectively suppress the mid-to-high frequency vibration of the rotor, thereby reducing the mid-to-high frequency noise generated by the rotor due to vibration.

[0058] This embodiment also provides an air conditioner, including the compressor described above; it reduces the noise of the compressor during operation and improves the user experience.

[0059] Example 2

[0060] Unlike Example 1, as Figure 3 , Figure 4 and Figure 5 As shown, viewed along the axial direction of the rotor lamination 11, the through hole 12 has a quadrilateral structure, which includes two wedge-shaped structures.

[0061] Furthermore, along the extension direction of the through hole, the width of the through hole 12 first increases and then decreases; preferably, the through hole 12 has a rhomboid structure.

[0062] Along the extension direction of the through hole 12, the width of the wedge structure gradually decreases according to the power exponent curve h and decreases to zero; satisfying h=a*xm, where h is the width of the wedge structure, a is a constant and a>0, x is the horizontal distance between the point where the width of the wedge structure is zero and any point of the wedge structure, and m is the power exponent and m≥2;

[0063] The through holes 12 include multiple through holes 12, which are arranged sequentially along the circumference of the rotor lamination 11, thereby improving the noise reduction effect of the through holes 12.

[0064] Example 3

[0065] Unlike Embodiment 1, the through hole 12 includes an inner straight segment and an outer straight segment. The inner straight segment is close to the center of the rotor lamination 11, and the outer straight segment is far from the center of the rotor lamination 11. The distance between the inner straight segment and the outer straight segment is the width of the through hole 12. The inner straight segment and the outer straight segment are separated at the first end 121 and intersect at the second end 122.

[0066] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A rotor lamination, characterized in that, The rotor lamination (11) has a through hole (12); the through hole (12) has a first end (121) and a second end (122), the first end (121) and the second end (122) have a positional difference at least in the circumferential direction of the rotor lamination (11), and the width of the through hole (12) extending from the first end (121) to the second end (122) gradually decreases; Viewed along the axial direction of the rotor lamination (11), the through hole (12) is a wedge-shaped structure and the wedge-shaped structure is an acoustic black hole structure; along the extension direction of the through hole (12), the width of the through hole (12) is distributed according to the law of gradually decreasing power exponent.

2. The rotor lamination according to claim 1, characterized in that, The through hole (12) includes an inner arc segment (123) and an outer arc segment (124). The inner arc segment (123) is close to the center of the rotor lamination (11), and the outer arc segment (124) is far from the center of the rotor lamination (11). The distance between the inner arc segment (123) and the outer arc segment (124) is the width of the through hole (12).

3. The rotor lamination according to claim 2, characterized in that, When both the inner arc segment (123) and the outer arc segment (124) are circular arcs, the inner arc segment (123) is concentric with the rotor lamination (11), and the outer arc segment (124) is not concentric with the rotor lamination (11); satisfying 8≤α / L≤13, where α is the central angle of the inner arc segment (123) and L is the width of the through hole (12) at the first end (121).

4. The rotor lamination according to claim 1, characterized in that, The through hole (12) includes an inner straight segment and an outer straight segment. The inner straight segment is close to the center of the rotor lamination (11), and the outer straight segment is far from the center of the rotor lamination (11). The distance between the inner straight segment and the outer straight segment is the width of the through hole (12).

5. The rotor lamination according to claim 1, characterized in that, Along the extension direction of the through hole (12), the width of the through hole (12) gradually decreases according to a power-law curve h and decreases to zero; satisfying h=a*x m In this system, a rectangular coordinate system is established with the point h=0 as the origin O. The rectangular coordinate system includes an X-axis and a Y-axis. The X-axis is set horizontally and the Y-axis is set vertically. A vertical reference line M is drawn through any point on the wall of the through hole (12). The intersection points of the reference line M and the wall of the through hole (12) are points M1 and M2, respectively, and h is the distance between points M1 and M2. A horizontal reference line N is drawn through any point on the wall of the through hole (12). The intersection points of the reference line N and the Y-axis are points N1 and x is the distance between points N1 and M2. a is a constant and a>0, and m is a power exponent and m≥2.

6. The rotor lamination according to claim 1, characterized in that, Viewed along the axial direction of the rotor lamination (11), the through hole (12) has a quadrilateral structure.

7. The rotor lamination according to any one of claims 1-6, characterized in that, The through holes (12) include a plurality of through holes (12), which are arranged sequentially along the circumference of the rotor lamination (11); the arrangement direction of the plurality of through holes (12) from the first end (121) to the second end (122) is consistent, and the arrangement direction is clockwise or counterclockwise.

8. A rotor, characterized in that, The rotor includes the rotor laminations according to any one of claims 1-7, and the rotation direction of the rotor is designed to be consistent with the arrangement direction of the first end (121) and the second end (122) of the through hole (12).

9. An electric motor, characterized in that, The motor includes the rotor as described in claim 8.

10. A compressor, characterized in that, The compressor includes the motor as described in claim 9.

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