Stator laminations, stator cores, motors, compressors and refrigeration equipment

Abstract

The present invention discloses a stator punching sheet, a stator core, a motor, a compressor and a refrigeration device, wherein the stator punching sheet includes a yoke, a plurality of teeth and a plurality of recessed structures; the plurality of teeth are provided on the inner peripheral surface of the yoke and are arranged at intervals along the circumference of the yoke; the plurality of recessed structures are arranged on the outer peripheral surface of the yoke, and the recessed structure includes a first recess, a second recess and a third recess, the first recess and the second recess are respectively provided on the yoke corresponding to the two adjacent teeth, and the first recess and the second recess are both located on the center lines of the respective corresponding teeth, and the third recess is connected between the first recess and the second recess; the groove formed between the two adjacent teeth is a stator slot, and on a cross section perpendicular to the central axis of the yoke, the relationship between the flow area S3 of the third recess, the number of stator slots Q, the outer diameter D of the yoke, and the thickness b of the yoke satisfies: the technical solution of the present invention can improve the stator fixed frequency and reduce the high-frequency carrier noise of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a stator punching sheet, a stator core, a motor, a compressor and a refrigeration equipment. Background Art

[0002] Existing household air conditioner compressor motors primarily use variable-frequency motors, whose input current is a modulated wave whose carrier wave is a high-frequency carrier. Improper motor design can exacerbate noise and vibration in the motor and compressor near the carrier frequency band, impacting both motor and compressor performance and severely affecting the user's auditory experience. Summary of the Invention

[0003] The main purpose of the present invention is to provide a stator punching sheet, aiming to improve the stator fixed frequency and reduce the high-frequency carrier noise of the motor.

[0004] To achieve the above-mentioned purpose, the stator punching sheet proposed in the present invention comprises:

[0005] yoke;

[0006] a plurality of teeth, provided on the inner circumferential surface of the yoke and arranged at intervals along the circumference of the yoke; and

[0007] a plurality of recessed structures arranged on the outer circumferential surface of the yoke, the recessed structures including a first recessed portion, a second recessed portion, and a third recessed portion, the first recessed portion and the second recessed portion being respectively arranged on the yoke portion corresponding to two adjacent teeth, and the first recessed portion and the second recessed portion being both located on the center line of the corresponding teeth, and the third recessed portion being connected between the first recessed portion and the second recessed portion;

[0008] The groove formed between two adjacent teeth is a stator slot, the number of the stator slots is Q, and the flow area of ​​the third recess is S3 on a cross section perpendicular to the central axis of the yoke. The relationship between the flow area S3 of the third recess, the number of stator slots Q, the outer diameter D of the yoke, and the thickness b of the yoke satisfies:

[0009] Optionally, in a cross section perpendicular to the central axis of the yoke, the relationship among the flow area S1 of the first recess, the flow area S2 of the second recess, the width b of the yoke, and the width t of the tooth portion satisfies: S1≤2b*t, S2≤2b*t.

[0010] Optionally, in a cross section perpendicular to the central axis of the yoke, the bottom wall of the third recess is a straight line structure; and / or the bottom wall of the third recess is an arc structure.

[0011] Optionally, there are k recessed structures, where k is greater than or equal to 3 and less than Q / 2.

[0012] Optionally, k is equal to 4.

[0013] Optionally, the number Q of the stator slots satisfies: Q≤12.

[0014] Optionally, Q is equal to 12.

[0015] The present invention further provides a stator core, which includes a plurality of stator punching sheets as described above, wherein the stator punching sheets are stacked in the axial direction.

[0016] The present invention also provides a motor, which includes the stator core described above.

[0017] Optionally, the motor includes the stator core and the rotor that match each other, and the pole pair number p of the rotor is less than or equal to 5.

[0018] The present invention also provides a compressor, which includes the motor as described above.

[0019] The present invention also provides a refrigeration device, which includes the compressor described above.

[0020] The technical solution of the present invention is to provide a plurality of recessed structures on the outer peripheral surface of the yoke, wherein each recessed structure is arranged at equal intervals along the axial circumference of the yoke and includes a first recessed portion, a second recessed portion, and a third recessed portion connected to each other. The first recessed portion and the second recessed portion are respectively provided on the yoke portion corresponding to two adjacent tooth portions, and the first recessed portion and the second recessed portion are both located on the center line of their respective corresponding tooth portions, thereby ensuring the electromagnetic field flow of the stator punching yoke portion, improving the efficiency of the motor, and ensuring the structural rigidity of the stator punching portion, thereby reducing the manufacturing cost. The third recessed portion is connected between the first recessed portion and the second recessed portion, and the relationship between the flow area S3 of the third recessed portion, the number of stator slots Q, the outer diameter D of the yoke portion, and the thickness b of the yoke portion satisfies the following: It is beneficial to further increase the gap between the yoke and the motor housing, and promote the reliable separation of most of the outer peripheral surface of the yoke from the inner wall of the motor housing, thereby effectively reducing the electromagnetic field distortion caused by the deformation and twisting of the stator punching sheets, and reducing the vibration transmitted to the housing, so that the natural frequency of the housing is staggered with the operating frequency of the motor when working, which can effectively avoid resonance and reduce noise. At the same time, it optimizes the magnetic circuit structure from the tooth to the yoke, and then reduces the magnetic force acting on the housing, effectively reducing the reaction force on the stator core composed of the stacked stator punching sheets, improving the stability of the stator core during rotation, reducing the iron loss during motor operation, and improving the performance efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 This is a structural diagram of an embodiment of a stator punching sheet of the present invention;

[0023] Figure 2 for Figure 1 Schematic diagram of parameters of various parts of the stator punching;

[0024] Figure 3 Schematic diagram of noise comparison of the compressor of the present invention at 60 rps;

[0025] Figure 4 Schematic diagram of noise comparison of the compressor of the present invention at 90 rps.

[0026] Description of Figure Numbers:

[0027] Label name Label name 10 Yoke 331 Main groove 20 Tooth 332 Auxiliary groove 21 stator slots 3321 First sub-groove 30 Depression structure 3322 Second sub-groove 31 first recess 34 third recess 32 second recess

[0028] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present invention provides a stator punching sheet.

[0034] Reference Figures 1 to 4 In an embodiment of the present invention, the stator sheet includes a yoke 10, a plurality of teeth 20, and a plurality of recessed structures 30; the plurality of teeth 20 are provided on the inner circumferential surface of the yoke 10 and are arranged at intervals along the circumferential direction of the yoke 10; the plurality of recessed structures 30 are arranged on the outer circumferential surface of the yoke 10, and the recessed structure 30 includes a first recess 31, a second recess 32, and a third recess 34. The first recess 31 and the second recess 32 are respectively provided on the yoke 10 corresponding to two adjacent teeth 20, and the first recess 31 and the second recess 34 are respectively provided on the yoke 10 corresponding to the adjacent teeth 20. 2 are located on the center lines of their respective corresponding teeth 20, the third recess 34 is connected between the first recess 31 and the second recess 32, wherein the groove formed between two adjacent teeth 20 is a stator slot 21, the number of the stator slots 21 is Q, and on a cross section perpendicular to the central axis of the yoke 10, the flow area of ​​the third recess 34 is S3, and the relationship between the flow area S3 of the third recess 34, the number Q of the stator slots 21, the outer diameter D of the yoke 10, and the thickness b of the yoke 10 satisfies: Furthermore, by improving the fixed frequency of the stator, the high-frequency carrier noise of the motor having the stator punching sheet is reduced.

[0035] The compressor includes a motor, the motor includes a stator core, the stator core includes a plurality of stacked stator punchings, and the stator punchings can be silicon steel sheets. The stator punchings include a yoke 10 and a plurality of teeth 20. The yoke 10 is an annular structure, wherein the inner circumferential surface of the yoke 10 is provided with a plurality of teeth 20, and the teeth 20 are evenly spaced along the circumference of the yoke 10 and extend radially inward along the yoke 10. Stator slots 21 for placing winding coils are defined between adjacent teeth 20, which are used to drive the rotor to rotate.

[0036] A plurality of recessed structures 30 are provided on the outer peripheral surface of the yoke 10, and the recessed structures 30 are arranged at equal intervals along the circumference of the yoke 10, and the openings of the recessed structures 30 are set away from the tooth portions 20 to increase the gap between the yoke 10 and the motor housing, wherein the recessed structure 30 includes a first recess 31, a second recess 32 and a third recess 34 connected to each other, and the first recess 31 and the second recess 32 are respectively provided on the yoke 10 corresponding to the two adjacent tooth portions 20, and the first recess 31 and the second recess 32 are both located on the center lines of their respective corresponding tooth portions 20, thereby ensuring the electromagnetic field circulation of the stator punching yoke 10, improving the motor efficiency, and ensuring the structural strength and rigidity of the stator punching, thereby reducing the manufacturing cost.

[0037] The third recess 34 is connected between the first recess 31 and the second recess 32 , and the relationship among the flow area S3 of the third recess 34 , the number Q of the stator slots 21 , the outer diameter D of the yoke 10 , and the thickness b of the yoke 10 satisfies: Specifically, is the ratio of the flow area of ​​the third recess 34 to the area of ​​the yoke 10. When the number of stator slots 21 is constant, When it is less than 0.01, the flow area of ​​the third recess 34 is small, that is, the gap between the third recess 34 and the motor housing is small. At this time, the yoke 10 and the motor housing cannot be separated well, and the vibration transmitted to the housing cannot be effectively reduced to avoid the occurrence of resonance. It is also impossible to make the refrigerant flow more smoothly, which is very likely to generate loud noise, shorten the service life of the motor, reduce the performance efficiency of the motor, and reduce the user's experience. When When it is greater than 0.3, the flow area of ​​the third recess 34 is larger, that is, the gap between the third recess 34 and the motor housing is larger. At this time, the width of the yoke 10 is smaller, which can easily lead to saturation of the magnetic circuit structure from the tooth portion 20 to the yoke 10, reduce the magnetic flux, and easily reduce the radial structural strength of the yoke 10, thereby reducing the performance efficiency of the motor. Therefore, setting the relationship between the flow area S3 of the third recess 34, the number Q of the stator slots 21, the outer diameter D of the yoke 10, and the thickness b of the yoke 10 to between 0.01 and 0.3 is conducive to further increasing the gap between the yoke 10 and the motor housing, and ensuring that most of the outer peripheral surface of the yoke 10 is reliably separated from the inner wall of the motor housing, thereby effectively reducing the electromagnetic field distortion caused by deformation and distortion of the stator punching sheets, and reducing the vibration transmitted to the housing, so that the natural frequency of the housing is staggered from the operating frequency (stator fixed frequency) of the motor when it is working, thereby reducing the vibration transmitted to the housing, which can effectively avoid resonance and reduce noise. At the same time, the magnetic circuit structure from the tooth 20 to the yoke 10 is optimized, and the reaction force on the stator core formed by the stacked stator punching sheets is effectively reduced, thereby improving the stability of the stator core during rotation, reducing the iron loss during motor operation, and improving the performance efficiency of the motor.

[0038] Specifically, the specific values ​​of the relationship among the flow area S3 of the third recess 34, the number Q of the stator slots 21, the outer diameter D of the yoke 10, and the thickness b of the yoke 10 can be 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, 0.2, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, 0.27, 0.28, 0.29, and 0.3.

[0039] In addition, the increase in the gap between the stator core and the motor housing can also increase the circulation channel for the refrigerant, allowing the refrigerant to flow reliably and extending the service life of the motor; it is also beneficial to the miniaturization of the compressor using this motor and to have a higher cooling capacity, while also helping to reduce the noise of the compressor.

[0040] The technical solution of the present invention is to provide a plurality of recessed structures 30 on the outer peripheral surface of the yoke 10, wherein each recessed structure 30 is arranged at equal intervals along the axial circumference of the yoke 10 and includes a first recessed portion 31, a second recessed portion 32 and a third recessed portion 34 connected to each other. The first recessed portion 31 and the second recessed portion 32 are respectively provided on the yoke 10 corresponding to two adjacent tooth portions 20, and the first recessed portion 31 and the second recessed portion 32 are both located on the center line of the respective corresponding tooth portions 20, thereby ensuring the electromagnetic field circulation of the stator punching yoke 10, improving the motor efficiency, and ensuring the structural rigidity of the stator punching, thereby reducing the manufacturing cost; the third recessed portion 34 is connected between the first recessed portion 31 and the second recessed portion 32, and the relationship between the flow area S3 of the third recessed portion 34, the number Q of the stator slots 21, the outer diameter D of the yoke 10, and the thickness b of the yoke 10 satisfies: This is conducive to further increasing the gap between the yoke 10 and the motor housing, promoting the reliable separation of most of the outer peripheral surface of the yoke 10 from the inner wall of the motor housing, thereby effectively reducing the electromagnetic field distortion caused by deformation and twisting of the stator punchings, and reducing the vibration transmitted to the housing, so that the natural frequency of the housing is staggered with the operating frequency of the motor during operation, which can effectively avoid resonance and reduce noise. At the same time, the magnetic circuit structure from the tooth portion 20 to the yoke 10 is optimized, and the magnetic force acting on the housing is reduced, thereby effectively reducing the reaction force on the stator core composed of the stacked stator punchings, improving the stability of the stator core during rotation, reducing the iron loss during motor operation, and improving the performance efficiency of the motor. At the same time, it effectively extends the service life of the motor.

[0041] Reference Figure 2 In one embodiment, on a cross section perpendicular to the central axis of the yoke 10, the relationship between the flow area S1 of the first recess 31, the flow area S2 of the second recess 32, the width b of the yoke 10, and the width t of the tooth 20 satisfies: S1≤2b*t, S2≤2b*t. Specifically, when the flow area of ​​the first recess 31 and / or the second recess 32 is greater than the product of twice the width of the yoke 10 and the width of the tooth portion 20, it is very easy for the first recess 31 and / or the second recess 32 to be too deep in the radial direction of the yoke 10 and the yoke 10 to be too narrow, resulting in a decrease in the radial structural strength of the yoke 10 and a decrease in the performance efficiency of the motor. Therefore, by limiting: S1≤2b*t, S2≤2b*t, it is possible to ensure the structural strength of the stator punchings, reduce manufacturing costs, meet the manufacturing process, and make manufacturing more convenient; it is also possible to reduce the vibration transmitted to the housing, so that the natural frequency of the housing is staggered from the operating frequency of the motor, effectively avoid resonance, and reduce noise. At the same time, it is possible to improve the stability of the stator core during rotation, reduce the iron loss during motor operation, and improve the performance efficiency of the motor; it is also possible to increase the circulation channel for the refrigerant, which is beneficial to the miniaturization of the compressor using the motor, and has a higher cooling capacity, and is also beneficial to reducing the noise of the compressor.

[0042] Optionally, in a cross section perpendicular to the central axis of the yoke 10, the bottom wall of the third recess 34 is a straight structure; and / or, the bottom wall of the third recess 34 is an arc structure, that is, the bottom wall of the third recess 34 can be a plane or an arc surface. It is only necessary to ensure that the bottom wall of the third recess 34 is set away from the inner wall of the shell. In this way, a gap can be ensured between the third recess 34 and the motor shell, effectively separating the outer peripheral surface of part of the yoke 10 from the inner wall surface of the shell, thereby effectively avoiding resonance, reducing noise, and improving heat dissipation. At the same time, it is beneficial to improve the stability of the motor during operation, reduce iron loss during operation, improve the performance efficiency of the motor, and effectively extend the service life of the motor.

[0043] Reference Figure 1 In one embodiment, the first recess 31 and the second recess 32 both include a main recess 331 and a sub-recess 332. The main recess 331 is provided on the center line of the tooth portion 20, and the sub-recess 332 is connected to the side of the main recess 331, which is beneficial to further increase the area of ​​the first recess 31 and the second recess 32 in the cross section perpendicular to the central axis of the yoke 10, thereby reducing noise, reducing manufacturing costs, increasing the refrigerant circulation area, and improving the performance efficiency of the motor while ensuring the electromagnetic field circulation of the yoke 10.

[0044] Specifically, the maximum distance between the main slot 331 and the center of the yoke 10 is smaller than the maximum distance between the secondary slot 332 and the center of the yoke 10. Since the main slot 331 is located on the centerline of the tooth 20, the main slot 331 has a greater depth in the radial direction of the yoke 10. This can increase the flow area of ​​the main slot 331 without affecting the structural strength of the yoke 10, thereby effectively reducing noise and improving heat dissipation. The secondary slot 332 is connected to the side of the main slot 331, that is, it extends toward the yoke 10 between two adjacent teeth 20. Due to the width limitation of the yoke 10, the depth of the secondary slot 332 in the radial direction of the yoke 10 is as small as possible compared to the depth of the main slot 331 in the radial direction of the yoke 10. This can reduce the risk of structural instability of the yoke 10, or even cracks or breakage, caused by the larger flow area of ​​the secondary slot 332, while also facilitating the operational feasibility of the stator punching process. Of course, in other embodiments, the maximum distance between the main groove portion 331 and the center of the yoke portion 10 can be greater than or equal to the maximum distance between the auxiliary groove portion 332 and the center of the yoke portion 10, as long as the structural stability of the stator punching and the operational feasibility of the processing technology are ensured. Of course, in other embodiments, the first recess 31 and / or the second recess 32 can only have the main groove portion 331.

[0045] Furthermore, in one embodiment, the auxiliary groove portion 332 includes a first sub-groove portion 3321, which is located between the two main groove portions 331, and is connected to the main groove portion 331 on one side and connected to the third recess 34 on the other side. At this time, the first recess 31 and the second recess 32 are both connected to the two sides of the third recess 34 through the corresponding first sub-groove portion 3321 to form a recessed structure 30 with a larger flow area, thereby promoting the reliable separation of most of the outer peripheral surface of the yoke 10 from the inner wall of the motor housing.

[0046] Furthermore, in one embodiment, the auxiliary groove portion 332 further includes a second sub-groove portion 3322, which is arranged close to the other recessed structure 30 and is connected to the main groove portion 331, that is, the side of the main groove portion 331 facing away from the first sub-groove portion 3321 is further connected to the second sub-groove portion 3322. At this time, the first recess 31, the second recess 32 and the third recess 34 are connected to form a recessed structure 30 with a larger flow area, further promoting the reliable separation of most of the outer peripheral surface of the yoke 10 from the inner wall of the motor housing. , thereby effectively reducing the electromagnetic field distortion caused by deformation and twisting of the stator punching sheets, and reducing the vibration transmitted to the housing, so that the natural frequency of the housing is staggered with the operating frequency of the motor when it is working, which can effectively avoid resonance and reduce noise. At the same time, it optimizes the magnetic circuit structure from the tooth portion 20 to the yoke portion 10, and then through the reduction of the magnetic force acting on the housing, effectively reduces the reaction force on the stator core composed of the stacked stator punching sheets, improves the stability of the stator core during rotation, reduces the iron loss during motor operation, and improves the performance efficiency of the motor. At the same time, it effectively extends the service life of the motor. Among them, the structures of the first sub-slot portion 3321 and the second sub-slot portion 3322 may be the same or different. Of course, in other embodiments, the auxiliary slot portion 332 may only include the first sub-slot portion 3321 or the second sub-slot portion 3322.

[0047] Therefore, the specific structures of the first recess 31 and the second recess 32 include but are not limited to the above structures.

[0048] Optionally, in one embodiment, on a cross section perpendicular to the central axis of the yoke 10, the bottom wall of the main slot portion 331 is a straight structure; and / or, the bottom wall of the main slot portion 331 is an arc structure. It can be understood that the bottom walls of the two main slot portions 331 are both planar structures or both arc structures; or, the bottom walls of the two main slot portions 331 are respectively a planar structure and an arc structure. The specific structure can be freely set while meeting the requirements of the magnetic circuit structure from the tooth portion 20 to the yoke 10, the performance efficiency of the motor, etc., and is not limited here.

[0049] Optionally, in one embodiment, there are k recessed structures 30, k is greater than or equal to 3 and less than Q / 2; specifically, when the number of recessed structures 30 is less than 3, most of the outer peripheral surface of the yoke 10 is connected to the motor housing, and the vibration transmitted to the housing is large, and the natural frequency of the housing cannot be staggered with the operating frequency of the motor when it is working, and the gap between the yoke 10 and the housing is small, which makes it very easy for resonance to occur, resulting in poor heat dissipation, increased noise, shortened service life of the motor, reduced performance efficiency of the motor, and reduced user experience; when the number of recessed structures 30 is greater than half of the number of stator slots 21, it is very easy to affect the structural stability of the stator punching sheet, thereby affecting the stability of the motor during operation, reducing the performance efficiency of the motor, increasing noise, and reducing the user experience. Therefore, the number of recessed structures 30 is set between 3 and Q / 2. This allows the majority of the outer circumference of the yoke 10 to be reliably separated from the inner wall of the motor housing, thereby reducing vibration transmitted to the housing, effectively avoiding resonance and reducing noise. At the same time, the magnetic circuit structure from the teeth 20 to the yoke 10 is optimized, improving the stability of the stator core during rotation, reducing iron loss during motor operation, and improving the performance and efficiency of the motor. When Q is 12, the specific number of recessed structures 30 can be 3, 4, 5, or 6. Figure 1 The number of the recessed structures 30 on the stator punching sheet shown is four.

[0050] Specifically, in one embodiment, k is equal to 4, that is, there are four recessed structures 30 on the stator punching sheet, and the four recessed structures 30 are arranged along the outer peripheral surface of the yoke 10, so that most of the outer peripheral surface of the yoke 10 can be reliably separated from the inner wall of the motor housing, which is beneficial to improving the performance efficiency of the motor.

[0051] Optionally, in one embodiment, the number Q of the stator slots 21 satisfies: Q≤12; wherein the number of the stator slots 21 can be selected according to actual needs. Specifically, Q is equal to 12.

[0052] The present invention further provides a stator core comprising a plurality of stator laminations. The specific structure of the stator laminations is similar to that of the aforementioned embodiments. Since the present stator core utilizes all of the technical solutions of all of the aforementioned embodiments, it at least possesses all of the beneficial effects of the technical solutions of the aforementioned embodiments, and therefore, no further description is given herein. The stator laminations are stacked axially.

[0053] The present invention also proposes a motor, which includes a stator core. The specific structure of the stator core refers to the above-mentioned embodiments. Since this motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0054] Specifically, the motor includes a matched stator core and a rotor, wherein the number of pole pairs p of the rotor is less than or equal to 5, that is, the number of poles can be 4, 6, or 8. When the number of stator slots Q is 12, the motor is a 12-slot 8-pole motor.

[0055] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above embodiment. Since the present compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail here. Among them, according to the limitation of the relevant parameters of the stator punching in the motor, the noise comparison of the compressor of the present application and the comparative model at 60rps is as follows: Figure 3 As shown, the noise comparison with the comparison model at 90rps is as follows Figure 4 As shown, it is obvious that the performance of the compressor of the present application is significantly better than that of the comparison model.

[0056] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above-mentioned embodiment. Since this refrigeration device adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0057] The above descriptions are merely optional embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: yoke; a plurality of teeth, provided on the inner circumferential surface of the yoke and arranged at intervals along the circumference of the yoke; as well as a plurality of recessed structures arranged on the outer circumferential surface of the yoke, the recessed structures including a first recessed portion, a second recessed portion, and a third recessed portion, the first recessed portion and the second recessed portion being respectively arranged on the yoke portion corresponding to two adjacent teeth, and the first recessed portion and the second recessed portion being both located on the center line of the corresponding teeth, and the third recessed portion being connected between the first recessed portion and the second recessed portion; The groove formed between two adjacent teeth is a stator slot, the number of the stator slots is Q, and the flow area of ​​the third recess is S3 on a cross section perpendicular to the central axis of the yoke. The relationship between the flow area S3 of the third recess, the number Q of the stator slots, the outer diameter D of the yoke, and the thickness b of the yoke satisfies: ; In a cross section perpendicular to the central axis of the yoke, the bottom wall of the third recess is a straight line structure; and / or the bottom wall of the third recess is an arc structure; There are k recessed structures, where k is greater than or equal to 3 and less than Q / 2.

2. The stator sheet according to claim 1, characterized in that: In a cross section perpendicular to the central axis of the yoke, the relationship among the flow area S1 of the first recess, the flow area S2 of the second recess, the width b of the yoke, and the width t of the tooth portion satisfies: S1≤2b*t, S2≤2b*t.

3. The stator sheet according to claim 1, characterized in that: k is equal to 4.

4. The stator sheet according to claim 1, characterized in that: The number Q of the stator slots satisfies: Q≤12.

5. The stator sheet according to claim 4, characterized in that: Q is equal to 12.

6. A stator core, characterized in that: The invention comprises a plurality of stator punching sheets according to any one of claims 1 to 5, wherein the stator punching sheets are stacked in the axial direction.

7. A motor, characterized in that: It comprises the stator core as claimed in claim 6.

8. The motor according to claim 7, characterized in that The motor includes the stator core and the rotor that match each other, and the pole pair number p of the rotor is less than or equal to 5.

9. A compressor, characterized in that: Comprising the motor according to any one of claims 7 to 8.

10. A refrigeration device, characterized in that: Comprising the compressor of claim 9.

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