Motor stator, motor, compressor and refrigeration equipment

Abstract

The present invention provides a motor stator, a motor, a compressor and a refrigeration device, wherein the motor stator comprises a stator body and a sound absorbing device, wherein the stator body comprises a yoke and a plurality of teeth, wherein the yoke has a first end face and a second end face opposite to each other, wherein the plurality of teeth are arranged at intervals along the circumference of the inner side wall of the yoke, wherein a stator slot is arranged between adjacent teeth, and wherein the outer side wall of the yoke is provided with a trimming groove penetrating the first end face and the second end face; wherein the sound absorbing device comprises a sound absorbing plate, wherein a plurality of sound absorbing holes are arranged on the sound absorbing plate; wherein the sound absorbing plate is arranged on the first end face of the yoke, and / or on the second end face, and / or in at least one trimming groove, and a cavity connected to the sound absorbing hole is left between the sound absorbing plate and the corresponding mounting surface on the yoke. According to the motor stator, the motor, the compressor and the refrigeration device of the embodiments of the present invention, the fluid noise when the refrigerant flows through the motor can be effectively reduced, and the noise reduction effect can be improved.

Description

Technical Field

[0001] The present invention mainly relates to the technical field of compressor noise reduction, and in particular to a motor stator, a motor, a compressor and a refrigeration device. Background Art

[0002] The bottom cavity in the compressor shell is provided with a pump body, the middle cavity is provided with a motor, and an exhaust port is formed on the top of the shell. When the compressor is running, the high-temperature and high-pressure gaseous refrigerant discharged from the bottom pump body enters the middle cavity, flows through the motor cut edge to the upper cavity, and finally is discharged from the compressor exhaust port. This process will generate significant fluid noise, and may also cause acoustic resonance of the compressor cavity, resulting in increased noise. Existing noise reduction methods such as built-in silencers in compressors can no longer meet the noise reduction needs of compressors. Summary of the invention

[0003] The object of the present invention is to provide a motor stator, a motor, a compressor and a refrigeration device to solve the problem of generating a large amount of noise when the refrigerant flows through the cavity of the compressor and is discharged from the exhaust port when the compressor is running.

[0004] To achieve the above-mentioned purpose, the present invention provides a motor stator, comprising a stator body and a sound absorbing device, wherein the stator body comprises a yoke and a plurality of teeth, the yoke having a first end face and a second end face opposite to each other, the plurality of teeth being arranged at intervals along the circumferential direction of the inner side wall of the yoke, a stator slot being arranged between adjacent teeth, and an outer side wall of the yoke being provided with a trimming groove penetrating the first end face and the second end face; the sound absorbing device comprises a sound absorbing plate, a plurality of sound absorbing holes being arranged on the sound absorbing plate; the sound absorbing plate being arranged on the first end face of the yoke, and / or on the second end face, and / or in at least one of the trimming grooves, and a cavity communicating with the sound absorbing hole is left between the sound absorbing plate and the corresponding mounting surface on the yoke.

[0005] Preferably, the sound absorbing plate comprises an annular structure adapted to the cross-section of the yoke, the annular structure is mounted on the first end surface and / or the second end surface, and at least one of the areas on the annular structure corresponding to the stator slots is axially provided with a plurality of the sound absorbing holes to form a first sound absorbing zone.

[0006] Preferably, a ratio P1 of the hole area of ​​the sound absorbing holes on one of the first sound absorbing zones to the area of ​​the corresponding first sound absorbing zone satisfies: 10%<P1<30%.

[0007] Preferably, the distance L1 between the centers of two adjacent sound absorbing holes and the aperture d1 of a single sound absorbing hole satisfy: 1<L1 / d1<2.

[0008] Preferably, the aperture of the sound absorbing hole satisfies d1<5mm.

[0009] Preferably, the thickness T1 of the sound absorbing plate satisfies: 0.1 mm<T1<3 mm.

[0010] Preferably, the depth H1 of the cavity satisfies: H1<10mm.

[0011] Preferably, the sound absorbing plate includes a concave structure adapted to the trimming groove, the concave structure includes a bottom and connecting parts connected to both sides of the bottom, the connecting parts are used to be connected to the groove wall of the trimming groove, the cavity is left between the inner surface of the bottom and the trimming groove, and a plurality of the sound absorbing holes are arranged on the bottom to form a second sound absorbing area.

[0012] Preferably, a ratio P2 of the sum of the hole areas of all the sound absorbing holes in one of the second sound absorbing zones to the area of ​​the corresponding second sound absorbing zone satisfies: 10%<P2<30%.

[0013] In addition, the present invention provides a motor, comprising the motor stator as described above.

[0014] In addition, the present invention provides a compressor, comprising the motor as described above.

[0015] In addition, the present invention provides a refrigeration device, comprising the compressor as described above.

[0016] Compared with the prior art, the motor stator provided by the present invention can effectively reduce the fluid noise when the refrigerant flows through the motor, and has a good noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a motor stator provided according to an embodiment of the present invention;

[0018] Figure 2 is a structural schematic diagram of a stator body of a motor stator provided according to an embodiment of the present invention;

[0019] Figure 3 A schematic structural diagram of a first sound absorbing plate of a motor stator provided according to an embodiment of the present invention;

[0020] Figure 4 It is a partial schematic diagram of a motor stator according to an embodiment of the present invention, showing a first cavity formed by a first sound absorbing plate and corresponding end surfaces of a yoke of a stator body;

[0021] Figure 5 The figure is a schematic structural diagram of a second sound absorbing plate of a motor stator provided according to an embodiment of the present invention.

[0022] Reference numerals:

[0023] 1000-motor stator; 1100-stator body; 1110-tooth portion; 1120-yoke portion; 1130-cutting groove;

[0024] 1200 - sound absorbing device; 1210 - first sound absorbing plate; 1211 - first sound absorbing area; 1212 - first sound absorbing hole; 1213 - first cavity; 1220 - second sound absorbing plate; 1221 - second plate body; 1222 - second sound absorbing hole; 1223 - second connecting portion. DETAILED DESCRIPTION

[0025] In order to make the purpose, advantages and features of the present invention more clear, the motor stator, motor, compressor and refrigeration equipment proposed by the present invention are further described in detail below in conjunction with the accompanying drawings. It should be noted that the accompanying drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0026] The motor stator, motor, compressor and refrigeration equipment provided by the present invention are further described below in conjunction with the accompanying drawings.

[0027] Figure 1 FIG. 1 is a schematic diagram of the structure of a motor stator 1000 according to an embodiment of the present invention. Figure 2 is a structural schematic diagram of a stator body 1100 of the motor stator 1000, Figure 3 is a schematic structural diagram of the first sound absorbing plate 1210 of the motor stator 1000, Figure 4 It is a partial schematic diagram of the motor stator.

[0028] like Figures 1 to 4 As shown, the motor stator 1000 includes a stator body 1100 and a sound absorbing device 1200, wherein the stator body 1100 includes a yoke 1120 and a plurality of teeth 1110, wherein the yoke 1120 has a first end face and a second end face opposite to each other in the axial direction of the motor stator, wherein the plurality of teeth 1110 are arranged at intervals along the circumferential direction of the inner side wall of the yoke 1120, and a stator slot is arranged between adjacent teeth 1110; the sound absorbing device 1200 includes a first sound absorbing plate 1210 and / or a second sound absorbing plate 1220, wherein a first sound absorbing hole 1212 is formed on the first sound absorbing plate 1210; the first sound absorbing plate 1210 is used to be arranged on the first end face and / or the second end face of the yoke 1120, and at least partially covers the corresponding end face, and a first cavity 1213 communicating with the first sound absorbing hole 1212 is formed between the first sound absorbing plate 1210 and the corresponding end face.

[0029] The outer wall of the yoke 1120 is provided with a trimming groove penetrating the first end surface and the second end surface, and the second sound absorbing plate 1220 is provided with a second sound absorbing hole 1222 . The second sound absorbing plate 1220 is used to be disposed in at least one of the trimming grooves.

[0030] The motor stator 1000 provided in the embodiment of the present invention is applied to a compressor. The compressor includes a housing, a pump body, a motor stator 1000 and other components. The housing has a cavity, the pump body is arranged at the bottom of the cavity, the motor stator 1000 is arranged in the middle of the cavity, and an exhaust port connected to the outside is formed on the top of the housing. When the motor stator 1000 is placed vertically, that is, according to Figure 1 When arranged in the orientation, the first end surface of the yoke 1120 may be the lower end surface of the motor stator 1000 , and the second end surface of the yoke 1120 may be the upper end surface of the motor stator 1000 .

[0031] When the compressor is running, the high-temperature and high-pressure gaseous refrigerant discharged from the pump body at the bottom of the cavity of the compressor housing enters the middle of the cavity and continues to diffuse upward. In this way, the high-temperature and high-pressure gaseous refrigerant first flows through the lower end surface of the motor stator 1000 of the embodiment of the present invention, then flows through the outer side wall of the motor stator 1000, then flows through the upper end surface of the motor stator 1000, and finally is discharged from the exhaust port at the top of the compressor. It should be understood that when the gaseous refrigerant flows through the motor stator 1000, part of the gaseous refrigerant passes through the first sound absorption hole 1212 and enters the first cavity 1213.

[0032] By installing the first sound absorbing plate 1210 on at least one of the upper end surface or the lower end surface of the motor stator 1000, when the sound waves of the fluid noise generated by the high-temperature and high-pressure gaseous refrigerant pass through the first sound absorbing hole 1212 and enter the first cavity 1213, the first sound absorbing hole 1212 and the gaseous refrigerant in the first cavity 1213 generate vibration friction, consuming part of the sound energy; when the frequency of the sound in the first sound absorbing hole 1212 is consistent with the frequency of the sound in the first cavity 1213, resonance will occur, and the sound waves of the fluid noise overcome the friction resistance of the first sound absorbing hole 1212 and the inner surface of the first cavity 1213 to do work, and a large amount of sound energy is converted into heat energy and dissipated, thereby achieving the purpose of sound absorption.

[0033] Furthermore, a second sound absorbing plate 1220 is installed on the outer wall of the motor stator 1000 to improve the noise reduction effect of the motor stator 1000. Figure 5 Combined with Figure 1 , Figure 2 In some embodiments, a trimming groove 1130 extending in the axial direction is provided on the outer side wall of the stator body 1100. At this time, the second sound absorbing plate 1220 is disposed in the trimming groove 1130, and a second cavity (not shown in the figure) communicating with the second sound absorbing hole 1222 is formed between the second sound absorbing plate 1220 and the groove wall of the trimming groove 1130.

[0034] In this embodiment, the number of the trimming grooves 1130 can be multiple, and the multiple trimming grooves 1130 are arranged at intervals along the circumference of the stator body 1100, and the second sound absorbing plate 1220 is disposed in at least one of the trimming grooves 1130. By arranging the second sound absorbing plate 1220 in the trimming groove 1130, the fluid noise generated by the gaseous refrigerant is further reduced, and the noise reduction effect of the motor stator 1000 is improved.

[0035] The specific structure of the first sound absorbing plate 1210 is first introduced below.

[0036] Please focus on Figure 3 The first sound absorbing plate 1210 is an annular structure adapted to the yoke 1120, the outer diameter of the first sound absorbing plate 1210 matches the outer diameter of the stator body 1100 (i.e., the outer diameter of the yoke 1120), and the inner diameter of the first sound absorbing plate 1210 may be less than or equal to the inner diameter of the yoke 1120. A plurality of the first sound absorbing holes 1212 are arranged in an array to form one or more first sound absorbing areas 1211.

[0037] The inner side wall of the stator body is provided with a stator slot extending in the axial direction, and a plurality of the first sound absorbing areas 1211 are arranged at intervals along the circumference of the yoke, and any one of the first sound absorbing areas 1211 corresponds to one of the stator slots. That is to say, the first sound absorbing holes 1212 on the first sound absorbing plate 1210 are arranged in an array to form one or more first sound absorbing areas 1211, and a plurality of the first sound absorbing areas 1211 are arranged at intervals along the circumferential direction. The first sound absorbing plate 1210 is mounted on the upper end face or the lower end face of the yoke 1120 of the stator body 1100. Preferably, the first sound absorbing area 1211 is a recessed area, and the first cavity 1213 is formed between the recessed area and the corresponding end thereof. It should be understood that all the recessed areas are located on the same surface of the first sound absorbing plate 1210, so that Figure 1 Taking the position shown as an example, for the first sound absorbing plate 1210 disposed on the upper end surface of the stator yoke 1120, the recessed area is formed on the lower surface of the first sound absorbing plate 1210. For the first sound absorbing plate 1210 disposed on the lower end surface of the stator yoke 1120, the recessed area is formed on its upper end surface.

[0038] When the trimming groove 1130 is formed on the stator body 1100 , a notch is correspondingly formed on the outer circumference of the first sound absorbing plate 1210 . The notch is located between two adjacent first sound absorbing areas 1211 to match with the trimming groove 1130 of the stator body 1100 .

[0039] It should be understood that, for a stator without the trimming groove 1130 on the stator body 1100, the distance between two adjacent first sound absorbing areas 1211 can be determined according to actual needs. Of course, in this case, only one continuous first sound absorbing area 1211 can be formed on the first sound absorbing plate 1210, and the first sound absorbing area 1211 extends along the circumference of the first sound absorbing plate 1210. It can extend a circle to form a 360° annular first sound absorbing area 1211, or it can be less than 360°.

[0040] It should also be understood that in an alternative embodiment, the first sound absorbing plate 1210 does not form the first sound absorbing area 1211, but forms the first cavity 1213 with the corresponding end surface of the stator yoke 1120 through other means. For example, in an optional implementation, the first sound absorbing plate includes a first plate body and a first connecting portion, the first plate body is provided with the first sound absorbing holes, the first connecting portion is provided on opposite sides of the first plate body, and protrudes toward the corresponding end surface of the yoke 1120, so as to be connected with the corresponding end surface of the yoke 1120, so that under the action of the first connecting portion, there is a gap between the first plate body and the corresponding end surface of the yoke 1120, so that the first cavity is formed therebetween.

[0041] Those skilled in the art know that the sound absorption frequency of the first sound absorbing plate 1210 is affected by factors such as the aperture size and hole spacing of the first sound absorbing holes 1212 , the thickness and perforation rate of the first sound absorbing area 1211 , and the depth of the first cavity 1213 .

[0042] For example, the lower the perforation rate of the first sound absorbing plate 1210, the lower the sound absorption frequency. That is to say, when the total area of ​​the first sound absorbing zone 1211 remains unchanged, reducing the total area of ​​the first sound absorbing holes 1212, that is, reducing the perforation rate of the first sound absorbing zone 1211, can enhance the sound absorption effect of the first sound absorbing plate 1210 on low-frequency noise. Based on this, in one embodiment of the present invention, the ratio P1 of the total area of ​​all the first sound absorbing holes 1212 on the same first sound absorbing zone 1211 to the area of ​​the corresponding first sound absorbing zone 1211 satisfies: 10%<P1<30%, so that the motor stator 1000 has a better sound absorption effect on low-frequency noise. At the same time, the smaller the total area of ​​the first sound absorbing holes 1212, the better the strength of the first sound absorbing plate 1210.

[0043] Furthermore, in this embodiment, the distance L1 between the centers of any two adjacent first sound absorbing holes 1212 and the aperture d1 of the first sound absorbing holes 1212 satisfy: 1<L1 / d1<2. The hole spacing between two adjacent first sound absorbing holes 1212 is slightly larger than the aperture of the first sound absorbing holes 1212, so that the first sound absorbing plate 1210 has good strength, is easy to install, and has a good noise reduction effect.

[0044] In one embodiment of the present invention, the first sound absorbing holes 1212 are arranged in an array on the first sound absorbing plate 1210. It can be understood that, from a process perspective, the first sound absorbing holes 1212 arranged in an array are convenient for production.

[0045] Please refer to Figure 4 Combined with Figure 3 , the thickness T1 of the first sound absorption zone 1211 is the dimension of the first sound absorption zone 1211 in the axial direction of the stator body 1100. Generally, the greater the thickness of the first sound absorption zone 1211, the lower the sound absorption frequency of the first sound absorption plate 1210. Optionally, the thickness T1 of the first sound absorption zone 1211 satisfies 0.1mm<T1<3mm to meet the absorption of low-frequency noise. Optionally, T1<1mm. In practical applications, the thickness of the first sound absorption zone 1211 can be set appropriately according to the frequency of the fluid noise generated by the gaseous refrigerant when the compressor is running, so as to achieve efficient absorption of the refrigerant fluid noise of a specific frequency and enhance the noise reduction effect of the motor stator 1000.

[0046] As mentioned above, the first sound absorption zone 1211 of the first sound absorption plate 1210 and the corresponding end surface of the yoke 1120 form a first cavity 1213, and the depth H1 of the first cavity 1213 satisfies: H1<10mm, optionally, H1<5mm. Among them, for the first cavity 1213 formed by the first sound absorption plate 1210, its depth refers to the distance between the inner surface of the first sound absorption zone 1211 (i.e., the surface of the first sound absorption zone 1211 facing the yoke 1120) and the corresponding surface of the yoke 1120 in the axial direction of the stator body 1100. Generally, the greater the depth of the first cavity 1213, the greater the sound absorption frequency of the first sound absorption plate 1210. When the depth H1 of the first cavity 1213 is less than 10mm, it can effectively absorb the low-frequency noise of the refrigerant fluid and avoid affecting the normal operation of the motor stator 1000.

[0047] In the above embodiment, the first sound absorption hole 1212 can be one or more of a circle, a rectangle, a triangle, and a trapezoid. Preferably, the first sound absorption hole 1212 is a circle for easy production. Those skilled in the art know that the aperture can affect the frequency of noise absorption. The larger the aperture, the higher the sound absorption frequency of the first sound absorption plate 1210. In this embodiment, the aperture d1 of the first sound absorption hole 1212 can meet the following conditions: d1 < 5 mm, optionally, d1 < 1 mm, which effectively reduces the low-frequency noise generated by the flow of the refrigerant and improves the noise reduction effect of the motor stator 1000.

[0048] Next, the specific structure of the second sound absorbing plate 1220 will be introduced.

[0049] Please refer to Figure 5The second sound absorbing plate 1220 is a long strip structure, including a second plate body 1221 and a second connecting portion 1223. The cross section of the second plate body 1221 matches the cross section of the trimming groove 1130, and the cross section is a cross section perpendicular to the axial direction of the stator body 1100. In a specific embodiment, the cross section of the trimming groove 1130 of the stator body 1100 is a U-shaped structure, and accordingly, the cross section of the second plate body 1221 is also a U-shaped structure. The second sound absorbing hole 1222 is provided on the second plate body 1221. The second connecting portion 1223 is arranged on the inner surface of the second plate body 1221 and protrudes from the inner surface. The second connecting portion 1223 is used to connect with the groove wall of the trimming groove 1130, so that the second cavity (not shown in the figure) is formed between the inner surface of the second plate body 1221 and the groove wall of the trimming groove 1130. In this embodiment, the second connecting portion 1223 can extend along the edge of the second plate body 1221.

[0050] Similar to the first sound absorbing plate 1210 , the sound absorption frequency of the second sound absorbing plate 1220 is affected by factors such as the aperture size and hole spacing of the second sound absorbing holes 1222 , the thickness and perforation rate of the second plate body 1221 , and the depth of the second cavity (not shown).

[0051] In a specific embodiment, the ratio P2 of the total area of ​​all the second sound absorbing holes 1222 on the same second plate body 1221 to the area of ​​the corresponding second plate body 1221 satisfies: 10%<P2<30%. And the distance L2 between the centers of any two adjacent second sound absorbing holes 1222 and the aperture d2 of the second sound absorbing hole 1222 satisfy: 1<L2 / d2<2. The second sound absorbing holes 1222 are arranged in an array on the second sound absorbing plate 1220 to facilitate the production of the second sound absorbing plate 1220. Among them, the second sound absorbing holes 1222 can be one or more of circular, rectangular, triangular, and trapezoidal. Preferably, the second sound absorbing holes 1222 are circular. Preferably, the aperture d2 of the second sound absorbing holes 1222 is set to be less than 5mm. Further, the thickness T2 of the second plate body 1221 is set to satisfy 0.1mm<T2<3mm. The thickness T2 of the second plate 1221 is the dimension of the second plate 1221 in the radial direction of the stator body 1100. The depth H2 of the second cavity (not shown in the figure) formed between the inner surface of the second sound absorbing plate 1220 and the groove wall of the trimming groove 1130 is less than 10 mm, wherein at this time, the depth of the second cavity (not shown in the figure) is the distance from the inner surface of the second plate 1221 (i.e., the surface of the second sound absorbing plate 1220 facing the trimming groove 1130) to the groove wall of the trimming groove 1130 in the radial direction of the stator body 1100. The second sound absorbing plate 1220 provided in this embodiment effectively reduces the low-frequency noise generated by the flow of the refrigerant, and improves the noise reduction effect of the motor stator 1000.

[0052] The embodiment of the present invention has no limitation on the material of the sound absorbing device 1200. For example, the sound absorbing device 1200 may be a metal material or a plastic material. Both of the above materials can meet the sound absorption and noise reduction requirements of the sound absorbing device 1200. In a specific application, when the sound absorbing device 1200 is made of a metal material, the sound absorbing device 1200 is mounted on the stator body 1100 by welding. When the sound absorbing device 1200 is made of a plastic material, the sound absorbing device 1200 is mounted on the stator body 1100 by gluing.

[0053] In addition, the present invention provides a motor, which includes the motor stator 1000 as described above.

[0054] In addition, the present invention provides a compressor, which includes the motor as described above.

[0055] In addition, the present invention provides a refrigeration device, which comprises the compressor as described above.

[0056] In summary, the motor stator, motor, compressor and refrigeration equipment provided by the present invention can effectively reduce the fluid noise when the refrigerant flows through the motor and improve the noise reduction effect.

[0057] Although the present invention is disclosed as above, it is not limited thereto. Those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A motor stator, characterized in that: The invention comprises a stator body and a sound absorbing device, wherein the stator body comprises a yoke and a plurality of teeth, the yoke has a first end face and a second end face opposite to each other, the plurality of teeth are arranged at intervals along the circumferential direction of the inner side wall of the yoke, a stator slot is arranged between adjacent teeth, and an outer side wall of the yoke is provided with a trimming groove penetrating the first end face and the second end face; the sound absorbing device comprises a sound absorbing plate, and a plurality of sound absorbing holes are arranged on the sound absorbing plate; the sound absorbing plate is arranged on the first end face of the yoke, and / or the second end face, and in at least one of the trimming grooves, a cavity communicating with the sound absorbing hole is reserved between the sound absorbing plate and the corresponding mounting surface on the yoke; a cavity communicating with the sound absorbing hole is formed between the sound absorbing plate and the groove wall of the trimming groove.

2. The motor stator according to claim 1, characterized in that: The sound absorbing plate comprises an annular structure adapted to the cross section of the yoke, the annular structure being mounted on the first end surface and / or the second end surface, and at least one of the regions corresponding to the stator slots on the annular structure being axially provided with a plurality of the sound absorbing holes to form a first sound absorbing area.

3. The motor stator according to claim 2, characterized in that: A ratio P1 of the sum of the hole areas of the sound absorbing holes on one of the first sound absorbing regions to the area of ​​the corresponding first sound absorbing region satisfies: 10%<P1<30%.

4. The motor stator according to claim 1, characterized in that: The distance L1 between the centers of two adjacent sound absorbing holes and the aperture d1 of a single sound absorbing hole satisfy: 1<L1 / d1<2.

5. The motor stator according to claim 1 or 2, characterized in that: The aperture of the sound absorbing hole satisfies d1<5mm.

6. The motor stator according to claim 1, characterized in that: The thickness T1 of the sound absorbing plate satisfies: 0.1 mm<T1<3 mm.

7. The motor stator according to claim 1 or 4, characterized in that: The depth H1 of the cavity satisfies: H1<10mm.

8. The motor stator according to claim 1, characterized in that: The sound absorbing plate comprises a concave structure adapted to the trimming groove, the concave structure comprises a bottom and connecting parts connected to both sides of the bottom, the connecting parts are used to be connected to the groove wall of the trimming groove, the cavity is left between the inner surface of the bottom and the trimming groove, and a plurality of the sound absorbing holes are arranged on the bottom to form a second sound absorbing area.

9. The motor stator according to claim 8, characterized in that: A ratio P2 of the sum of the hole areas of all the sound absorbing holes in one of the second sound absorbing zones to the area of ​​the corresponding second sound absorbing zone satisfies: 10%<P2<30%.

10. A motor, characterized in that: The invention comprises the motor stator as described in any one of claims 1 to 9.

11. A compressor, characterized in that: The motor comprising the motor described in claim 10.

12. A refrigeration device, characterized in that: Comprising the compressor as claimed in claim 11.

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