Stator core sheets, stator cores, motors, compressors, and refrigeration equipment

Abstract

This application discloses a stator core sheet, a stator core, a motor, a compressor, and a refrigeration device, wherein the stator core sheet comprises a stator yoke, and arc portions and buffer portions are alternately arranged on the outer circumferential surface of the stator yoke, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions are tangent to the extension of the arc portions and have one point of contact.

Description

Technical Field

[0005] ,

[0001] This application claims the priority of the Chinese patent application with the patent application number 202311153915.1 filed with the China National Intellectual Property Administration on September 7, 2023, and incorporates the full text thereof herein by reference.

[0002] This application relates to the technical field of compressors, and particularly to stator core sheets, stator cores, motors, compressors, and refrigeration equipment.

Background Art

[0003] The motors of conventional household air conditioner compressors mainly adopt variable frequency motors. The input current of variable frequency motors is a modulated wave, and the carrier of the modulated wave is a high-frequency carrier. Since the natural frequency of the stator of the motor is in the range of several hundred to several thousand, when the natural frequency of the stator of the motor is close to the high-frequency carrier, resonance occurs and high-frequency noise is generated. The noise of the high-frequency carrier greatly affects the user's auditory sense, and the deterioration of vibration also directly affects the service life of the product. Therefore, how to solve the resonance of the motor in the prior art is an urgent problem to be solved by those skilled in the art.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The main object of this application is to provide a stator core sheet that adjusts the natural frequency of the stator and avoids resonance between the stator of the motor and other structures of the compressor.

Means for Solving the Problems

[0005] To achieve the above objective, this application proposes a stator core sheet comprising a stator yoke, wherein arc portions and buffer portions are alternately arranged on the outer circumferential surface of the stator yoke, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions have one contact point tangent to the extension of the arc portions.

[0006] In one embodiment, the stator core sheet further comprises a plurality of stator teeth connected to the stator yoke, the plurality of stator teeth being spaced apart along the inner circumferential surface of the stator yoke, and the curved portion being located between two adjacent stator teeth.

[0007] In one embodiment, the curved portion is located on the midline between two adjacent status teeth.

[0008] In one embodiment, a status lot is formed between any two adjacent status teeth, the number of status lots is Q, and 9 ≤ Q ≤ 15.

[0009] In one embodiment, Q is 12.

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

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

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

[0013] In one embodiment, the distance from the arc portion to the center of the stator core sheet is R, satisfying the condition 42 mm ≤ R ≤ 75 mm.

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

[0015] This application further proposes a stator core comprising a plurality of stator core sheets, wherein the plurality of stator core sheets are arranged in a stack along the axial direction of the stator core sheet. The stator core sheet comprises a stator yoke, wherein arc portions and buffer portions are alternately provided on the outer circumferential surface of the stator yoke, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions have one contact point tangent to the extension of the arc portions.

[0016] This application further proposes a motor comprising the stator core described above, wherein the stator core comprises a plurality of stator core sheets, the plurality of stator core sheets are stacked along the axial direction of the stator core sheets. The stator core sheets comprise a stator yoke, wherein arc portions and buffer portions are alternately provided on the outer circumferential surface of the stator yoke, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions have one contact point tangent to the extension of the arc portions.

[0017] In one embodiment, the motor comprises a stator core and a rotor core that are mated to each other, and the ratio of the number of stator rods of the stator core to the number of poles of the rotor core is 3:2 or 6:5.

[0018] This application further proposes a compressor comprising the motor described above, wherein the motor comprises a stator core, the stator core comprises a plurality of stator core sheets, the plurality of stator core sheets are stacked along the axial direction of the stator core sheet. The stator core sheet comprises a stator yoke, the outer circumferential surface of the stator yoke alternately having arc portions and buffer portions, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions have one contact point tangent to the extension of the arc portions.

[0019] This application further proposes a refrigeration apparatus comprising the above-described compressor, wherein the compressor comprises a motor, the motor comprises a stator core, the stator core comprises a plurality of stator core sheets, the plurality of stator core sheets are arranged in a stack along the axial direction of the stator core sheet. The stator core sheet comprises a stator yoke, the outer circumferential surface of the stator yoke alternately having arc portions and buffer portions, the buffer portion includes a curved portion and two arc portions, the two arc portions are located on opposite sides of the curved portion, the distance from the arc portions to the center of the stator core sheet is smaller than the distance from the arc portions to the center of the stator core sheet, and the curve portions have one contact point tangent to the extension of the arc portions. [Brief explanation of the drawing]

[0020] To more clearly illustrate the embodiments of this application or the technical solutions in the prior art, the drawings that may be used in the description of the embodiments or the prior art are briefly described below. Of course, the drawings in the following description are only a few embodiments of this application, and those skilled in the art can obtain other drawings based on these illustrated structures without any creative effort.

[0021] [Figure 1] This is a schematic diagram of the structure of one embodiment of the stator core sheet of this application. [Figure 2]It is an enlarged view of part A in FIG. 1. [Figure 3] It is a structural schematic diagram of another embodiment of the state core sheet of the present application. [Figure 4] It is a schematic diagram of the noise comparison of the compressor of the present application at 60 rps. [Figure 5] It is a schematic diagram of the noise comparison of the compressor of the present application at 90 rps.

[0022] The realization, functional features and advantages of the present application will be further described based on the embodiments with reference to the drawings.

Modes for Carrying Out the Invention

[0023] Hereinafter, referring to the drawings in the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Of course, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, those skilled in the art can obtain all other embodiments without creative labor, and all of them are included in the protection scope of the present application.

[0024] In addition, if there is something related to the indication of directions (for example, up, down, left, right, front, back...) in the embodiments of the present application, the indication of such directions is only for explaining the relative positional relationship, movement status, etc. between each member in a specific posture (as shown in the drawings). When the specific posture changes, the indication of such directions will also change accordingly.

[0025] Furthermore, in the embodiments of this application, where there are descriptions of "first," "second," etc., such descriptions of "first," "second," etc. are for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly specifying the number of technical features. Therefore, features limited by "first," "second," etc., may explicitly or implicitly include at least one such feature. Also, "and / or" appearing throughout the text means that three parallel solutions are included, for example, "A and / or B," which includes solution A, or solution B, or a solution that satisfies both A and B simultaneously. In addition, the technical solutions in each embodiment can be combined with each other, provided that they are feasible to a person skilled in the art, and if a combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions shall not exist and shall not be included in the scope of protection of this application.

[0026] This application provides an embodiment of a stator core sheet, in which a plurality of stator core sheets are stacked axially to form a stator core, the stator core being part of a motor, and is mainly applied to air conditioner compressors, electric vehicles, and fan systems. The compressor comprises a motor, the motor comprises a stator core, the stator core comprises a plurality of stacked stator core sheets, the stator core sheets may be silicon steel sheets, the stator core sheet comprises a stator yoke and a plurality of stator teeth, the stator yoke has an annular structure, a plurality of stator teeth are provided on the inner circumferential surface of the stator yoke, each stator tooth is arranged at uniform intervals along the circumferential direction of the stator yoke and extends inward along the radial direction of the stator yoke, a stator rod is defined between each adjacent stator tooth in which a winding coil is arranged, and is used to rotate the rotor.

[0027] Conventional household air conditioner compressors primarily employ variable frequency motors. The input current to a variable frequency motor is a modulated wave, and the carrier of this modulated wave is a high-frequency carrier. Because the natural frequency of the motor's stator ranges from several hundred to several thousand, if the motor's stator's natural frequency is close to that of the high-frequency carrier, resonance occurs, generating high-frequency noise. This high-frequency carrier noise significantly affects the user's auditory perception, and the deterioration of vibrations directly impacts the product's lifespan.

[0028] Referring to Figures 1 to 3, in one embodiment of the present application, the stator core sheet 10 comprises a stator yoke 100, and arc portions 110 and buffer portions 120 are alternately arranged on the outer circumferential surface of the stator yoke 100, the buffer portion 120 includes a curved portion 121 and two arc portions 122, the two arc portions 122 are located on opposite sides of the curved portion 121, the distance from the arc portion 122 to the center of the stator core sheet 10 is smaller than the distance from the arc portion 110 to the center of the stator core sheet 10, and the curve portion 121 has one contact point tangent to the extension of the arc portion 110.

[0029] Specifically, the stator core sheet 10 is a sheet-like structure having a certain thickness, the stator yoke 100 is provided in a substantially annular shape, and a plurality of buffer portions 120 are provided at intervals on the outer peripheral wall surface of the stator yoke 100. The alternating arrangement of the arc portions 110 and buffer portions 120 on the outer peripheral surface of the stator yoke 100 means that in the circumferential direction of the stator yoke 100, the arc portions 110 and buffer portions 120 are arranged alternately in an "ABAB..." pattern, and the number of arc portions 110 and buffer portions 120 may be the same or different. The buffer portion 120 includes a curved portion 121 and two arc-shaped portions 122, the two arc-shaped portions 122 being located on opposite sides of the curved portion 121, and the arc-shaped portions 122 are formed by being recessed inward from the outer circumferential surface of the stator yoke 100, and their specific form is a notch on the outer circumferential surface of the stator yoke 100, the curved portion 121 is located between the two arc-shaped portions 122, and its specific form is the outer circumferential surface of the stator yoke 100, and is located at the connection point of the two arc-shaped portions 122 and is formed by protruding outward, and it is a solid structure.

[0030] The curved portion 122 is recessed in the direction from the outer circumferential surface of the stator yoke 100 toward the center of the stator core sheet 10. In this case, the curved portion 122 does not directly contact the inner wall of the housing after the stator core sheet 10 has been installed, further reducing the transmission of vibrations during motor operation, effectively avoiding resonance, and reducing noise. At the same time, the structure of the magnetic circuit from the stator teeth 200 to the stator yoke 100 is optimized, and the reduced magnetic force acting on the housing effectively reduces the reaction force received by the stator core, which is formed by stacking the stator core sheets 10. This improves the stability of the stator core during rotation, reduces iron loss during motor operation, and improves the performance efficiency of the motor. In addition, increasing the gap between the stator core and the motor housing can also increase the flow path for the refrigerant, which is advantageous for miniaturizing the compressor to which the motor is applied, and also has the advantage of providing a high cooling capacity and reducing compressor noise.

[0031] In one embodiment, the outer wall surface of the curved portion 121 is provided in an arc shape. That is, the curved portion 121 is a convex arc, and the curvature of the arc is not specifically limited, and its shape may be a convex semicircle, a convex semiellipse, or other convex irregular arc structure, and none of these are specifically limited.

[0032] The curved portion 121 has one point of contact with the extension of the arc portion 110. Specifically, let R be the distance from the arc portion 110 to the center of the stator core sheet 10, where R can be understood as the radius when the stator yoke 100 does not have a buffer portion 120. Let r1 be the distance from the arc portion 110 to the center of the stator core sheet 10, and the fact that the distance from the arc portion 110 to the center of the stator core sheet 10 and the maximum distance from the curved portion 121 to the center of the stator core sheet 10 coincides means R=r1, and we ignore the small errors between the two that occur during production and consider R=r1.

[0033] Since the outer wall surface of the curved portion 121 is an arc surface, the maximum distance from the curved portion 121 to the center of the stator core sheet 10 is unique. When R satisfies R=r1 and each of the opposing sides of the curved portion 121 has two arc sections 122, the surface of the stator yoke 100 without a buffer portion 120 is set as a perfect circular surface 500. Here, the perfect circular surface 500 is a virtual surface, and when R satisfies R=r1, it indicates that the curved portion 121 is in contact with the perfect circular surface 500 and that there is only one contact point between them. In this way, the buffer portion 120 of the outer wall of the stator yoke 100 is divided into a curved portion 121 and two arc-shaped portions 122, allowing the natural frequency of the stator of the stator core sheet 10 to be adjusted. By modulating the natural frequency of the stator to multiple different natural frequencies, resonance between the motor stator and other structures in the compressor during motor operation is avoided, thereby reducing noise caused by high-frequency carriers and improving user experience. At the same time, the occurrence of resonance within the motor is reduced, further extending the product's service life.

[0034] Furthermore, since multiple buffer portions 120 are provided at intervals on the outer circumferential wall surface of the stator yoke 100, the stator yoke 100 is not a perfectly circular structure. For this reason, the entire stator core sheet 10 is also not a perfectly circular structure. The term "center of the stator core sheet 10" here refers to the center of the stator yoke 100 when the outer circumferential surface of the stator yoke 100 is a single perfect circle, in the case where the outer circumferential wall of the stator yoke 100 does not have buffer portions 120. When buffer portions 120 are installed on the outer circumferential wall of the stator yoke 100, their arrangement direction is also spaced along the outer circumferential wall of the stator yoke 100, so the position of the center of the stator does not change and does not affect the determination of the position of the center of the stator.

[0035] In the technical solution of this application, arc portions 110 and buffer portions 120 are alternately arranged on the outer circumferential surface of the stator yoke 100 of the stator core sheet 10, wherein the buffer portion 120 includes a curved portion 121 and two arc portions 122, the two arc portions 122 are located on opposite sides of the curved portion 121, the distance from the arc portions 122 to the center of the stator core sheet 10 is smaller than the distance from the arc portion 110 to the center of the stator core sheet 10, and the curve portion 121 has one contact point tangent to the extension of the arc portion 110. In this way, the natural frequency of the stator of the stator core sheet 10 can be adjusted, and by modulating the natural frequency of the stator to several different natural frequencies, resonance between the motor stator and other structures in the compressor during motor operation can be avoided. This reduces noise caused by high-frequency carriers, improves user experience, and further extends the product's lifespan by reducing the occurrence of resonance within the motor.

[0036] Referring to Figures 1 to 3, in one embodiment, the stator core sheet 10 further comprises a plurality of stator teeth 200 connected to the stator yoke 100, the plurality of stator teeth 200 being spaced apart along the inner circumferential surface of the stator yoke 100, and the curved portion 121 being located between two adjacent stator teeth 200.

[0037] In one embodiment, the stator teeth 200 are for winding the stator coil, and a stator rod 300 for housing the coil is formed between any two adjacent stator teeth 200. The curved portion 121 is located on the outer circumferential surface of the stator yoke 100, and in the radial direction of the stator yoke 100, the curved portion 121 is located between two adjacent stator teeth 200, and more specifically, the curved portion 121 is located on the midline between two adjacent stator teeth 200. In this way, the position of the curved portion 121 allows for the positioning of the buffer portion 120 on the outer circumferential surface of the stator yoke 100, ensuring that multiple buffer portions 120 are arranged at equal intervals on the outer circumferential surface of the stator yoke 100. At the same time, when processing the stator core sheet 10, the two arced portions 122 can be press-formed based on the position of the curved portion 121.

[0038] In one embodiment, the two arc-shaped sections 122 may be provided on the centerlines of the stator yoke 100 corresponding to two adjacent stator teeth 200, thereby ensuring the flow of magnetism from the stator yoke 100 to the stator core sheet 10, improving motor efficiency, ensuring the structural strength and rigidity of the stator core sheet 10, and reducing manufacturing costs.

[0039] Referring to Figures 1 to 3, in one embodiment, a status lot 300 is formed between any two adjacent status teeth 200, and the number of status lots 300 is Q, satisfying 9 ≤ Q ≤ 15. Specifically, the specific number of status lots 300, Q, may be 9, 10, 11, 12, 13, 14, or 15 in order to ensure the motor's performance. As shown in Figure 1, in one embodiment, the number of status lots 300 is set to 12.

[0040] Continuing to refer to Figures 1 to 3, in one embodiment, the arc portion 110 and / or the buffer portion 120 are arranged at equal intervals along the outer circumferential surface of the stator yoke 100. Specifically, the arc portion 110 may be arranged at equal intervals along the outer circumferential surface of the stator yoke 100, the buffer portion 120 may be arranged at equal intervals along the outer circumferential surface of the stator yoke 100, or both the arc portion 110 and the buffer portion 120 may be arranged at equal intervals along the outer circumferential surface of the stator yoke 100. This arrangement is convenient for the processing and production of the stator core sheet 10, while the arrangement of the equally spaced arc portion 110 and / or buffer portion 120 is rational, ensuring consistency between the structure of the magnetic circuit in the motor and the amount of coolant passing through the buffer portion 120, thereby ensuring the motor's performance and efficiency.

[0041] In one embodiment, the number of arc portions 110 and / or buffer portions 120 is 3 to 6. Specifically, if the number of arc portions 110 and / or buffer portions 120 is less than 3, a large portion of the outer surface of the stator yoke 100 is connected to the motor housing, increasing the vibration transmitted to the housing. This makes it impossible to shift the natural frequency of the housing from the operating frequency of the motor, and the gap between the stator yoke 100 and the housing becomes small, which in turn makes resonance more likely to occur, reducing the heat dissipation effect, increasing noise, shortening the motor's service life, decreasing the motor's performance efficiency, and degrading the user experience. On the other hand, if the number of arc portions 110 and / or buffer portions 120 is more than 6, it is more likely to affect the structural stability of the stator core sheet 10, which in turn affects the stability of the motor during operation, decreasing the motor's performance efficiency, increasing noise, and degrading the user experience. Therefore, by installing 3 to 6 arc sections 110 and / or buffer sections 120, the majority of the outer surface of the stator yoke 100 and the inner wall of the motor housing can be reliably separated, reducing vibrations transmitted to the housing, effectively avoiding resonance, reducing noise, optimizing the structure of the magnetic circuit from the stator teeth 200 to the stator yoke 100, 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 arc sections 110 may be specifically 3, 4, 5, or 6, and the number of buffer sections 120 may be specifically 3, 4, 5, or 6. As shown in Figure 1, in one embodiment, the number of arc sections 110 and / or buffer sections 120 is 4.

[0042] In one embodiment, the distance from the arc portion 110 to the center of the stator core sheet 10 is R, satisfying 42mm ≤ R ≤ 75mm. Specifically, R is the distance from the arc portion 110 to the center of the stator core sheet 10, and R here can be understood as the radius of the stator yoke 100 when it does not have a buffer portion 120, i.e., the radius of the stator core sheet 10. When the distance R from the arc portion 110 to the center of the stator core sheet 10 satisfies 42mm ≤ R ≤ 75mm, the motor's performance and efficiency can be ensured, and a decrease in the motor's performance and efficiency due to the radius of the stator core sheet 10 being too large or too small can be avoided. The value of R may be 42mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, or 75mm. In one embodiment, the maximum distance R from the outer circumferential surface of the stator yoke 100 to the center of the stator core sheet 10 satisfies 45 mm ≤ R ≤ 65 mm.

[0043] Typically, when the compressor is 60 rps or 90 rps, the carrier noise of the compressor at 5000 Hz is shown in the table below. The ratio of the number of stator rods in the stator core to the number of poles in the rotor core was set to 12:8, and the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 was set to 55 mm and 40 mm for comparison, and the measured data is as follows.

[0044] [Table 1]

[0045] From the data in the table above, the carrier noise value for the compressor at 5000Hz was obtained. When the ratio of the number of stator rods on the stator core to the number of poles on the rotor core is 12:8, and the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 is 55mm, the noise reduction effect of the compressor at 60rps / dB and 90rps / dB is more pronounced. When the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 is 40mm, it falls outside the range of 42mm to 75mm, and the improvement effect on carrier noise is not clear.

[0046] In one embodiment, the carrier noise of the 6300Hz compressor is shown in the table below. The ratio of the number of stator rods on the stator core to the number of poles on the rotor core was set to 12:8, and the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 was set to 55mm and 40mm for comparison. The measured data is as follows.

[0047] [Table 2]

[0048] From the data in the table above, the carrier noise value for the compressor at 6300Hz was obtained. When the ratio of the number of stator rods on the stator core to the number of poles on the rotor core is 12:8, and the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 is 55mm, the compressor in this case shows a more significant noise reduction effect at 60rps / dB and 90rps / dB. When the distance R from the outer surface of the stator yoke 100 to the center of the stator core sheet 10 is 40mm, it falls outside the range of 42mm to 75mm, and the improvement effect on carrier noise is not clear.

[0049] This application further proposes a stator core comprising a plurality of stator core sheets, each of which is arranged in a stack along the axial direction of the stator core sheet. The specific structure of the stator core sheets is described in the above embodiments, and since this stator core employs all the technical solutions of all the above embodiments, it has at least all the beneficial effects of the technical solutions of the above embodiments, and therefore redundant explanations are omitted here.

[0050] This application further proposes a motor comprising the stator core described above. The specific structure of the stator core is described with reference to the above embodiments, and since the motor employs all the technical solutions of all the above embodiments, it has at least all the beneficial effects of the technical solutions of the above embodiments, and redundant explanations are omitted here. In one embodiment, the motor comprises a stator core and a rotor core that are mated to each other, and the ratio of the number of slots in the motor to the number of poles in the rotor is 3:2 or 6:5.

[0051] This application further proposes a compressor comprising the motor described above, wherein each stator core sheet is arranged in a stack along the axial direction of the stator core sheet. The specific structure of the stator core sheet is described in the above embodiment, and since this compressor employs all the technical solutions of all the above embodiments, it has at least all the beneficial effects of the technical solutions of the above embodiments, and redundant explanations are omitted here. Here, based on the limitations of the parameters related to the stator core sheet in the motor, the noise of the compressor of this application is compared with that of a comparative model at 60 rps, as shown in Figure 4, and the noise of the compressor of this application is compared with that of a comparative model at 90 rps, as shown in Figure 5, and in both cases the performance of the compressor of this application is clearly superior to that of the comparative model.

[0052] This application further proposes a refrigeration apparatus comprising the above-mentioned compressor, wherein each of the stator core sheets is arranged in a stack along the axial direction of the stator core sheet. The specific structure of the stator core sheets is described in the above-mentioned embodiment, and since the refrigeration apparatus employs all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects of the technical solutions of the above-mentioned embodiments, and redundant explanations are omitted here.

[0053] The above description is merely an example of a possible embodiment of this application and does not limit the scope of this application. Any equivalent structural modifications obtained from the description and drawings of this application, or their direct or indirect application to other technical fields, are all included within the scope of this application's patent protection. [Explanation of Symbols]

[0054] 10... Stator core sheet, 100... Stator yoke, 110... Arc section, 120... Cushion section, 121... Curved section, 122... Arc section, 200... Stator teeth, 300... Stator rod, 400... Perfectly circular surface.

Claims

1. A stator core sheet equipped with a stator yoke, Arc portions and buffer portions are alternately arranged on the outer circumferential surface of the stator yoke. The buffer portion includes a curved portion and two arc-shaped portions. The two arc sections are located on opposite sides of the curved section. The distance from the arc portion to the center of the stator core sheet is smaller than the distance from the arc portion to the center of the stator core sheet. The curved portion has one point of contact with the extension of the arc portion. Stator core sheet.

2. The stator core sheet further comprises a plurality of stator teeth connected to the stator yoke, The plurality of stator teeth are arranged at intervals along the inner circumferential surface of the stator yoke. The curved portion is located between two adjacent stata teeth. The stator core sheet according to claim 1.

3. The aforementioned curved portion is located on the midline between two adjacent status teeth. The stator core sheet according to claim 2.

4. A status lot is formed between any two adjacent status teeth. The number of status lots is Q, and 9 ≤ Q ≤ 15. The stator core sheet according to claim 3.

5. Q is 12. The stator core sheet according to claim 4.

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

7. The number of the arc portion and / or the buffer portion is 3 to 6. The stator core sheet according to claim 6.

8. The number of the arc portion and / or the buffer portion is four. The stator core sheet according to claim 7.

9. The distance from the arc portion to the center of the stator core sheet is R, satisfying 42 mm ≤ R ≤ 75 mm. A stator core sheet according to any one of claims 1 to 5.

10. 45 mm ≤ R ≤ 65 mm. The stator core sheet according to claim 9.

11. A plurality of stator core sheets according to any one of claims 1 to 10, A stator core is provided in which a plurality of stator core sheets are stacked along the axial direction of the stator core sheets.

12. A motor comprising the stator core described in claim 11.

13. It comprises a stator core and a rotor core that interlock with each other, The ratio of the number of status lots in the stator core to the number of poles in the rotor core is 3:2 or 6:

5. The motor according to claim 12.

14. A compressor comprising the motor described in claim 12.

15. A refrigeration apparatus comprising the compressor described in claim 14.

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