Stator lamination, stator core, motor, compressor, and refrigeration device

Abstract

The present application discloses a stator lamination, a stator core, a motor, a compressor, and a refrigeration device. The stator lamination comprises a stator yoke. Arc sections and buffer sections are alternately provided on an outer peripheral surface of the stator yoke. Each buffer section comprises a curved segment and two arc line segments. The two arc line segments are located on two opposite sides of the curved segment, respectively. A distance from each arc line segment to the center of the stator lamination is less than a distance from each arc section to the center of the stator lamination. The curved segment is tangent to an extension line of the arc section and has a point of tangency.

Description

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

[0001] This application claims priority to Chinese patent application No. 202311153915.1 filed on September 7, 2023, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of compressors, and in particular to a stator punching sheet, a stator core, a motor, a compressor and a refrigeration device. Background Art

[0003] Existing household air conditioner compressor motors primarily use variable-frequency motors. The input current of these motors is a modulated wave, and the carrier of this modulated wave is a high-frequency carrier. Because the fixed frequency of the motor's stator ranges from several hundred to several thousand kHz, when the stator fixed frequency and the high-frequency carrier are close, resonance occurs, generating high-frequency noise. This high-frequency carrier noise seriously affects the user's auditory experience, and increased vibration directly impacts the product's lifespan. Therefore, addressing motor resonance in existing technologies is a pressing issue for those skilled in the art. Technical issues

[0004] The main purpose of this application is to propose a stator punching sheet, which is intended to adjust the stator fixed frequency, thereby avoiding resonance between the motor stator and other structures of the compressor. Technical Solutions

[0005] To achieve the above-mentioned purpose, the stator punching sheet proposed in the present application includes a stator punching sheet, and the outer peripheral surface of the stator yoke is alternately provided with arc segments and buffer segments, and the buffer segment includes a curved segment and two arc segments, and the two arc segments are located on opposite sides of the curved segment. The distance from the arc segment to the center of the stator punching sheet is smaller than the distance from the circular arc segment to the center of the stator punching sheet, and the curved segment is tangent to the extension line of the circular arc segment and has a tangent point.

[0006] In one embodiment, the stator punching sheet further includes a plurality of stator teeth connected to the stator yoke, the plurality of stator teeth are arranged at intervals along the inner circumference of the stator yoke, and the curved segment is located between two adjacent stator teeth.

[0007] In one embodiment, the curved segment is located on a center line between two adjacent stator teeth.

[0008] In one embodiment, a stator slot is formed between any two adjacent stator teeth, and the number of the stator slots is Q, satisfying 9≤Q≤15.

[0009] In one embodiment, Q is equal to 12.

[0010] In one embodiment, the arc segments and / or the buffer segments are arranged at equal intervals along the outer circumference of the stator yoke.

[0011] In one embodiment, the number of the arc segments and / or the buffer segments is 3-6.

[0012] In one embodiment, the number of the arc segments and / or the buffer segments is four.

[0013] In one embodiment, the distance from the arc segment to the center of the stator punching sheet is R, which satisfies 42 mm≤R≤75 mm.

[0014] In one embodiment, 45 mm≤R≤65 mm.

[0015] The present application also provides a stator core, comprising a plurality of stator laminations as described above, the plurality of stator laminations being stacked axially along the stator laminations. The stator laminations include a stator yoke, the outer circumferential surface of the stator yoke being alternately provided with arc segments and buffer segments, the buffer segments comprising a curved segment and two arc segments, the two arc segments being located on opposite sides of the curved segment, the distance between the arc segments and the center of the stator lamination being less than the distance between the circular arc segments and the center of the stator lamination, and the curved segment being tangent to an extension of the circular arc segment and having a tangent point.

[0016] The present application also provides a motor, comprising the stator core described above, the stator core comprising a plurality of stator laminations, the plurality of stator laminations being stacked axially along the stator laminations. The stator laminations comprise a stator yoke, the outer circumference of the stator yoke being alternately provided with arc segments and buffer segments, the buffer segments comprising a curved segment and two arc segments, the two arc segments being located on opposite sides of the curved segment, the distance between the arc segments and the center of the stator lamination being less than the distance between the circular arc segments and the center of the stator lamination, and the curved segment being tangent to an extension of the circular arc segment and having a tangent point.

[0017] In one embodiment, the motor includes a stator core and a rotor core that cooperate with each other, and the ratio of the number of stator slots of the stator core to the number of stages of the rotor core is 3:2 or 6:5.

[0018] The present application also provides a compressor, comprising the motor described above, the motor comprising a stator core, the stator core comprising a plurality of stator laminations, the plurality of stator laminations being stacked axially along the stator laminations. The stator laminations comprising a stator yoke, the outer circumferential surface of the stator yoke being alternately provided with arc segments and buffer segments, the buffer segments comprising a curved segment and two arc segments, the two arc segments being located on opposite sides of the curved segment, the distance between the arc segment and the center of the stator lamination being less than the distance between the circular arc segment and the center of the stator lamination, the curved segment being tangent to an extension of the circular arc segment and having a tangent point.

[0019] The present application also provides a refrigeration device, comprising the compressor described above, the compressor comprising a motor, the motor comprising a stator core, the stator core comprising a plurality of stator laminations, the plurality of stator laminations being stacked axially along the stator laminations. The stator laminations comprise a stator yoke, the outer circumference of the stator yoke being alternately provided with arc segments and buffer segments, the buffer segments comprising a curved segment and two arc segments, the two arc segments being located on opposite sides of the curved segment, the distance between the arc segment and the center of the stator lamination being less than the distance between the circular arc segment and the center of the stator lamination, and the curved segment being tangent to an extension of the circular arc segment and having a tangent point. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application 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 application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0021] FIG1 is a schematic structural diagram of an embodiment of a stator punching sheet of the present application;

[0022] Figure 2 is an enlarged view of point A in Figure 1;

[0023] FIG3 is a schematic structural diagram of another embodiment of the stator punching of the present application;

[0024] FIG4 is a schematic diagram showing a noise comparison of the compressor of the present application at 60 rps;

[0025] FIG5 is a schematic diagram showing a noise comparison of the compressor of the present application at 90 rps.

[0026] Description of Figure Numbers:

[0027] Label Name Label Name 10 Stator punching sheet 122 Arc segment 100 Stator yoke 200 Stator tooth 110 Circular arc segment 300 Stator slot 120 Buffer segment 400 Full circular surface 121 Curve segment

[0028] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. Modes for Carrying Out the Invention

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), such 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 indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, 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, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme in which A and B are satisfied at the same time. 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 this application.

[0032] The present application proposes an embodiment of a stator lamination, wherein multiple stator laminations are stacked together along the axial direction of the stator laminations to form a stator core. The stator core is part of a motor and is primarily used in air-conditioning compressors, electric vehicles, and fan systems. The compressor includes a motor, which includes a stator core. The stator core includes multiple stacked stator laminations, which can be silicon steel sheets. The stator laminations include a stator yoke and multiple stator teeth. The stator yoke is an annular structure, wherein the inner circumferential surface of the stator yoke is provided with multiple stator teeth, each of which is evenly spaced along the circumference of the stator yoke and extends radially inward along the stator yoke. Stator slots for winding coils are defined between adjacent stator teeth, thereby driving the rotor to rotate.

[0033] Existing household air conditioner compressor motors primarily use variable-frequency motors. The input current of these motors is a modulated wave, and the carrier of the modulated wave is a high-frequency carrier. Because the fixed frequency of the motor's stator ranges from several hundred to several thousand kHz, when the stator fixed frequency and the high-frequency carrier are close, resonance occurs, generating high-frequency noise. This high-frequency carrier noise severely impacts the user's auditory perception, and increased vibration can directly impact the product's lifespan.

[0034] Please refer to Figures 1 to 3. In one embodiment of the present application, the stator punching sheet 10 includes a stator yoke 100. The outer circumferential surface of the stator yoke 100 is alternately provided with arc segments 110 and buffer segments 120. The buffer segment 120 includes a curved segment 121 and two arc segments 122. The two arc segments 122 are located on opposite sides of the curved segment 121. The distance from the arc segment 122 to the center of the stator punching sheet 10 is smaller than the distance from the circular arc segment 110 to the center of the stator punching sheet 10. The curved segment 121 is tangent to the extension line of the circular arc segment 110 and has a tangent point.

[0035] Specifically, the stator laminations 10 are sheet-like structures of a certain thickness. The stator yoke 100 is generally annular, with a plurality of buffer segments 120 disposed at intervals on the outer circumferential surface of the stator yoke 100. The arc segments 110 and the buffer segments 120 are alternately arranged on the outer circumferential surface of the stator yoke 100. This means that the arc segments 110 and the buffer segments 120 are alternately arranged in an "ABAB..." arrangement in the circumferential direction of the stator yoke 100. The number of arc segments 110 and buffer segments 120 can be the same or different. The buffer segment 120 includes a curved segment 121 and two arc segments 122. The two arc segments 122 are located on opposite sides of the curved segment 121. It should be noted that the arc segment 122 is formed by the inward depression of the outer peripheral surface of the stator yoke 100, and its specific form is a notch on the outer peripheral surface of the stator yoke 100. The curved segment 121 is located between the two arc segments 122. Its specific form is the outer peripheral surface of the stator yoke 100, and is located at the connection between the two arc segments 122 and bulges outward. It is a solid structure.

[0036] The arc segment 122 is recessed from the outer peripheral surface of the stator yoke 100 toward the center of the stator punching sheet 10. At this time, after the stator punching sheet 10 is installed, the arc segment 122 will not directly contact the inner wall of the housing. On the one hand, it can further reduce the transmission of vibration when the motor is working, effectively avoid resonance, and reduce noise. On the other hand, it optimizes the magnetic circuit structure from the stator teeth 200 to the stator yoke 100, 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 10, improves the stability of the stator core during rotation, reduces the iron loss during motor operation, and improves the performance efficiency of the motor. In addition, the increase in the gap between the stator core and the motor housing can also increase the circulation channel for the refrigerant, which is conducive to the miniaturization of the compressor using the motor and has a higher cooling capacity, and is also conducive to reducing the noise of the compressor.

[0037] In one embodiment, the outer wall of the curved segment 121 is arc-shaped. In other words, the curved segment 121 is an arc-shaped protrusion, and the curvature of the arc is not specifically limited. The curved segment 121 can be in the form of a raised semicircle, a raised semi-ellipse, or other irregularly shaped protrusions, all of which are not specifically limited.

[0038] The curved segment 121 is tangent to the extension line of the circular segment 110 and has a tangent point. Specifically, the distance from the circular segment 110 to the center of the stator punching sheet 10 is set to R, where R can be understood as the radius of the stator yoke 100 when it does not have the buffer segment 120. The distance from the circular segment 110 to the center of the stator punching sheet 10 is set to r1. The distance from the circular segment 110 to the center of the stator punching sheet 10 is consistent with the maximum distance from the curved segment 121 to the center of the stator punching sheet 10, which is referred to as R=r1. Slight errors between the two during production are negligible and are also considered to be R=r1.

[0039] Since the outer wall surface of the curved segment 121 is an arc-shaped surface, the maximum distance from the curved segment 121 to the center of the stator punching sheet 10 is unique. Since R satisfies R=r1, and the two opposite sides of the curved segment 121 are respectively two arc segments 122, the surface of the outer peripheral surface of the stator yoke 100 when the buffer segment 120 is not provided is set to the full circular surface 500. The full circular surface 500 referred to here is a virtual surface. When R satisfies R=r1, it indicates that the curved segment 121 is tangent to the full circular surface 500, and there is only one tangent point between the two. In this way, the buffer segment 120 of the outer peripheral wall of the stator yoke 100 is divided into the curved segment 121 and the two arc segments 122. The stator fixed frequency of the stator punching sheet 10 can be adjusted, and a certain order stator fixed frequency can be modulated into a variety of different fixed frequencies, thereby avoiding resonance between the motor stator and other structures in the compressor when the motor is working, thereby reducing the noise caused by the high-frequency carrier and improving the user experience. At the same time, since the resonance in the motor is reduced, the service life of the product is further improved.

[0040] It should be noted that, since a plurality of buffer segments 120 are arranged at intervals on the outer peripheral wall surface of the stator yoke 100, the stator yoke 100 is not a complete circular structure. Therefore, the stator punching sheet 10 as a whole is not a complete circular structure. The center of the stator punching sheet 10 referred to in this article refers to the center of the circle when there is no buffer segment 120 on the outer peripheral wall of the stator yoke 100 and the outer peripheral surface of the stator yoke 100 is a complete circle; and after the buffer segments 120 are arranged on the outer peripheral wall of the stator yoke 100, their arrangement direction is also arranged at intervals along the outer peripheral wall of the stator yoke 100. The position of the center of the circle will not change, and will not affect the determination of the center of the circle.

[0041] The technical solution of the present application is to alternately arrange arc segments 110 and buffer segments 120 on the outer peripheral surface of the stator yoke 100 of the stator punching sheet 10, wherein the buffer segment 120 includes a curved segment 121 and two arc segments 122, the two arc segments 122 are located on opposite sides of the curved segment 121, the distance between the arc segment 122 and the center of the stator punching sheet 10 is smaller than the distance between the circular segment 110 and the center of the stator punching sheet 10, and the curved segment 121 is tangent to the extension line of the circular segment 110 and has a tangent point. With such an arrangement, the stator fixed frequency of the stator punching sheet 10 can be adjusted, and a certain order stator fixed frequency can be modulated into a variety of different fixed frequencies, thereby avoiding resonance between the motor stator and other structures in the compressor when the motor is working, thereby reducing the noise caused by the high-frequency carrier and improving the user experience; at the same time, since the resonance in the motor is reduced, the service life of the product is further improved.

[0042] Referring to Figures 1 to 3, in one embodiment, the stator punching sheet 10 further includes a plurality of stator teeth 200 connected to the stator yoke 100, the plurality of stator teeth 200 are arranged at intervals along the inner circumference of the stator yoke 100, and the curved segment 121 is located between two adjacent stator teeth 200.

[0043] In one embodiment, the stator teeth 200 are used to wind stator coils, and a stator slot 300 for accommodating the coils is formed between any two adjacent stator teeth 200. The curved segment 121 is located on the outer circumference of the stator yoke 100, and in the radial direction of the stator yoke 100, the curved segment 121 is located between two adjacent stator teeth 200. Furthermore, the curved segment 121 is located on the center line of the two adjacent stator teeth 200. In this way, the position of the buffer segment 120 on the outer circumference of the stator yoke 100 can be positioned by the position of the curved segment 121, thereby ensuring that multiple buffer segments 120 can be arranged at equal intervals on the outer circumference of the stator yoke 100. At the same time, when the stator punching sheet 10 is processed and manufactured, two arc segments 122 can also be punched out based on the position of the curved segment 121.

[0044] In one embodiment, the two arc segments 122 can be respectively arranged on the center lines of the stator yoke 100 corresponding to two adjacent stator teeth 200, ensuring the electromagnetic field circulation of the stator punching sheet 10 and the stator yoke 100, improving the efficiency of the motor, and ensuring the structural strength and rigidity of the stator punching sheet 10, thereby reducing manufacturing costs.

[0045] Referring to Figures 1 to 3 , in one embodiment, a stator slot 300 is formed between any two adjacent stator teeth 200. The number of stator slots 300 is Q, satisfying 9 ≤ Q ≤ 15. Specifically, the number of stator slots 300, Q, can be 9, 10, 11, 12, 13, 14, or 15 to ensure motor performance. As shown in Figure 1 , in one embodiment, the number of stator slots 300 is set to 12.

[0046] Please continue to refer to Figures 1 to 3. In one embodiment, the arc segments 110 and / or the buffer segments 120 are arranged at equal intervals along the outer circumference of the stator yoke 100. Specifically, the arc segments 110 can be arranged at equal intervals along the outer circumference of the stator yoke 100, or the buffer segments 120 can be arranged at equal intervals along the outer circumference of the stator yoke 100, or both the arc segments 110 and the buffer segments 120 can be arranged at equal intervals along the outer circumference of the stator yoke 100. This arrangement, on the one hand, facilitates the processing and production of the stator punching sheets 10, and on the other hand, the reasonable layout of the arc segments 110 and / or the buffer segments 120 arranged at equal intervals ensures the consistency of the magnetic circuit structure in the motor and the amount of refrigerant passing through the buffer segments 120, thereby ensuring the performance and efficiency of the motor.

[0047] In one embodiment, the number of the arc segments 110 and / or the buffer segments 120 is 3-6. Specifically, when the number of the arc segments 110 and / or the buffer segments 120 is less than 3, most of the outer circumference of the stator yoke 100 is connected to the motor housing, and the vibration transmitted to the housing is large, making it impossible to stagger the natural frequency of the housing with the operating frequency of the motor when it is working. In addition, the gap between the stator yoke 100 and the housing is small, which makes it very easy for resonance to occur, resulting in poor heat dissipation, increased noise, shortened motor service life, reduced motor performance efficiency, and reduced user experience. When the number of the arc segments 110 and / or the buffer segments 120 is greater than 6, it is very easy to affect the structural stability of the stator punching 10, thereby affecting the stability of the motor during operation, reducing the motor performance efficiency, increasing noise, and reducing the user experience. Therefore, the number of arc segments 110 and / or buffer segments 120 is set to 3-6, so that most of the outer peripheral surface of the stator yoke 100 can be reliably separated from the inner wall of the motor housing, thereby reducing the vibration transmitted to the housing, effectively avoiding resonance, and reducing noise. At the same time, the magnetic circuit structure from the stator teeth 200 to the stator yoke 100 is optimized, improving the stability of the stator core during rotation, reducing iron loss during motor operation, and improving the performance efficiency of the motor. The number of the arc segments 110 can be 3, 4, 5, or 6, and the number of the buffer segments 120 can be 3, 4, 5, or 6. As shown in Figure 1, in one embodiment, the number of the arc segments 110 and / or the buffer segments 120 is 4.

[0048] In one embodiment, the distance R between the arc segment 110 and the center of the stator lamination 10 satisfies 42 mm ≤ R ≤ 75 mm. Specifically, R is the distance between the arc segment 110 and the center of the stator lamination 10. Here, R can be understood as the radius of the stator yoke 100 when it does not have the buffer section 120, that is, the radius of the stator lamination 10. When the distance R between the arc segment 110 and the center of the stator lamination 10 satisfies 42 mm ≤ R ≤ 75 mm, the performance and efficiency of the motor can be guaranteed, and the reduction in motor performance and efficiency due to the excessively large or small radius of the stator lamination 10 can be avoided. The value of R can be 42 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, or 75 mm. In one embodiment, the maximum distance R between the outer circumference of the stator yoke 100 and the center of the stator lamination 10 satisfies 45 mm ≤ R ≤ 65 mm.

[0049] Typically, when the compressor is running at 60 rps and 90 rps, the 5000 Hz carrier noise of the compressor is shown in the following table: The ratio of the number of stator slots in the stator core to the number of stages in the rotor core is set to 12:8, and the distance R from the outer circumference of the stator yoke 100 to the center of the stator punching 10 is set to 55 mm and 40 mm for comparison. The measured data are as follows:

[0050] Table 1-1. Compressor 5000 Hz carrier noise values

[0051]

[0052] The data in the table above shows that for the 5000 Hz compressor carrier noise level, when the ratio of the number of stator slots in the stator core to the number of rotor core stages is 12:8 and the distance R from the outer circumference of the stator yoke 100 to the center of the stator punching 10 is 55 mm, the compressor achieves more significant noise reduction at 60 rps / dB and 90 rps / dB. However, when the distance R from the outer circumference of the stator yoke 100 to the center of the stator punching 10 is 40 mm, it falls outside the range of 42 mm to 75 mm and has little effect on carrier noise reduction.

[0053] In one embodiment, the carrier noise of the compressor at 6300 Hz is shown in the following table: The ratio of the number of stator slots in the stator core to the number of stages in the rotor core is set to 12:8, and the distance R from the outer circumference of the stator yoke 100 to the center of the stator punching sheet 10 is set to 55 mm and 40 mm for comparison. The measured data are as follows:

[0054] Table 1-2. Compressor 6300 Hz carrier noise values

[0055]

[0056] The data in the table above indicates that for the 6300 Hz compressor carrier noise level, when the ratio of the number of stator slots in the stator core to the number of rotor core stages is 12:8 and the distance R from the outer circumference of the stator yoke 100 to the center of the stator lamination 10 is 55 mm, the compressor achieves more significant noise reduction at 60 rps / dB and 90 rps / dB. However, when the distance R from the outer circumference of the stator yoke 100 to the center of the stator lamination 10 is 40 mm, it falls outside the range of 42 mm to 75 mm and has little effect on carrier noise reduction.

[0057] This application also provides a stator core comprising a plurality of stator laminations, each of which is stacked axially. The specific structure of the stator laminations is similar to that of the aforementioned embodiments. Since this 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 will not be further elaborated upon here.

[0058] This application also proposes a motor comprising the aforementioned stator core. The specific structure of the stator core is described with reference to the above-described embodiments. Since this motor utilizes all of the technical solutions of all of the above-described embodiments, it at least possesses all of the beneficial effects brought about by the technical solutions of the above-described embodiments, and thus will not be described in detail here. In one embodiment, the motor comprises a stator core and a rotor core that cooperate with each other, and the ratio of the number of slots in the motor to the number of stages in the rotor is 3:2 or 6:5.

[0059] The present application also proposes a compressor, which includes the aforementioned motor, and each of the stator punchings is stacked along the axial direction of the stator punching. The specific structure of the stator punching refers to the above-mentioned embodiment. Since the present compressor 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. Among them, according to the definition of the relevant parameters of the stator punching in the motor, the noise comparison of the compressor of the present application with the comparison model at 60rps is shown in Figure 4, and the noise comparison with the comparison model at 90rps is shown in Figure 5. It can be clearly seen that the performance of the compressor of the present application is significantly better than the comparison model.

[0060] This application also provides a refrigeration device, comprising the aforementioned compressor, wherein the stator punchings are stacked axially. The specific structure of the stator punchings is similar to the above-described embodiments. Since this refrigeration device utilizes all the technical solutions of all the above-described embodiments, it at least has all the beneficial effects brought about by the technical solutions of the above-described embodiments, and no further details will be given here.

[0061] The above description is merely an optional embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural transformations made using the contents of the present application specification and drawings under the inventive concept of the present application, or direct / indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A stator punching sheet, wherein: The stator punching sheet includes a stator yoke, and the outer peripheral surface of the stator yoke is alternately provided with arc segments and buffer segments, the buffer segment includes a curved segment and two arc segments, the two arc segments are located on opposite sides of the curved segment, the distance from the arc segment to the center of the stator punching sheet is smaller than the distance from the circular arc segment to the center of the stator punching sheet, and the curved segment is tangent to the extension line of the circular arc segment and has a tangent point.

2. The stator sheet according to claim 1, wherein: The stator punching sheet further includes a plurality of stator teeth connected to the stator yoke, the plurality of stator teeth are arranged at intervals along the inner circumference of the stator yoke, and the curved segment is located between two adjacent stator teeth.

3. The stator sheet according to claim 2, wherein: The curved line segment is located on the center line of two adjacent stator teeth.

4. The stator sheet according to claim 3, wherein: A stator slot is formed between any two adjacent stator teeth, and the number of the stator slots is Q, satisfying 9≤Q≤15.

5. The stator sheet according to claim 4, wherein: Q is equal to 12.

6. The stator sheet according to any one of claims 1 to 5, wherein: The arc segments and / or the buffer segments are arranged at equal intervals along the outer circumferential surface of the stator yoke.

7. The stator sheet according to claim 6, wherein: The number of the arc segments and / or the buffer segments is 3-6.

8. The stator sheet according to claim 7, wherein: The number of the arc segments and / or the buffer segments is 4.

9. The stator sheet according to any one of claims 1 to 5, wherein: The distance from the arc segment to the center of the stator punching sheet is R, which satisfies 42 mm≤R≤75 mm.

10. The stator sheet according to claim 9, wherein: 45 mm≤R≤65 mm.

11. A stator core, wherein: The stator core comprises a plurality of stator punching sheets according to any one of claims 1 to 10, and the plurality of stator punching sheets are stacked along the axial direction of the stator punching sheets.

12. A motor, wherein: The electric motor comprises the stator core according to claim 11.

13. The electric machine according to claim 12, wherein: The motor comprises a stator core and a rotor core which cooperate with each other, and the ratio of the number of stator slots of the stator core to the number of stages of the rotor core is 3:2 or 6:

5.

14. A compressor, wherein: The compressor includes the motor of claim 12.

15. A refrigeration device, wherein: The refrigeration device comprises the compressor according to claim 14.

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