Stator, motor, compressor and refrigeration equipment

Abstract

The utility model discloses a stator, a motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the stator comprises a stator iron core, the stator iron core comprises a stator yoke, the peripheral wall of the stator yoke comprises at least one group of first trimming segments and at least one group of arc segments, each group of first trimming sections comprises two first trimming sections which are symmetrically arranged, each group of arc sections comprises two arc sections which are symmetrically arranged, the arc sections are connected with the first trimming sections, the diameter of each arc section is L1, the shortest distance between the two first trimming sections which are symmetrically arranged is L2, and the diameter of each arc section is L2. According to the technical scheme provided by the utility model, the heat dissipation effect and the motor efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the technical field of refrigeration equipment, and in particular to a stator, motor, compressor and refrigeration equipment. Background Technology

[0002] Single-phase induction motors are simple in structure and highly energy efficient, making them widely used in home appliances such as air conditioners. However, due to their structural characteristics, air conditioner compressors require a significant amount of refrigerant to pass axially through the motor. These refrigerant channels, while occupying motor space, also serve to dissipate heat from the motor. Therefore, a well-designed channel to balance the impact on motor efficiency while achieving better heat dissipation is crucial for compressor motors. Utility Model Content

[0003] The main purpose of this invention is to provide a stator, motor, compressor, and refrigeration equipment, which aims to improve heat dissipation and motor efficiency.

[0004] To achieve the above objectives, the stator proposed in this utility model includes:

[0005] A stator core, comprising a stator yoke, wherein the outer peripheral wall of the stator yoke comprises at least one set of first tangent segments and at least one set of arc segments, each set of first tangent segments comprising two symmetrically arranged first tangent segments, and each set of arc segments comprising two symmetrically arranged arc segments, wherein the arc segments are connected to the first tangent segments, the diameter of the arc segments is L1, and the shortest distance between the two symmetrically arranged first tangent segments is L2, 1.02 ≤ ≤1.2.

[0006] In one embodiment, the maximum thickness of the stator yoke along the radial direction of the stator core is W1, and the minimum thickness of the stator yoke along the radial direction of the stator core is W2, where W1-W2≤0.5mm.

[0007] In one embodiment, a plurality of stator slots are formed within the stator core, including a first stator slot and a second stator slot. The cross-sectional area of ​​the first stator slot is larger than that of the second stator slot. The outer peripheral wall of the stator yoke also includes at least one set of second tangent segments. Each set of second tangent segments includes two symmetrically arranged second tangent segments. The length of the first tangent segment is greater than that of the second tangent segment. The first stator slot is arranged opposite to the second tangent segment and the arc segment, and the second stator slot is arranged opposite to the first tangent segment.

[0008] In one embodiment, a groove formed by the extension of the first or second tangent segment and the adjacent arc segment is defined as a tangent groove. The tangent groove includes a first tangent groove and a second tangent groove that are connected. The minimum depth of the first tangent groove is equal to the maximum depth of the second tangent groove. The minimum depth of the first tangent groove is h, where h ≥ 1.5 mm. The sum of the cross-sectional areas of the plurality of tangent grooves is S1, and the sum of the cross-sectional areas of the plurality of first tangent grooves is S2. ≥0.8.

[0009] In one embodiment, the second stator slot has at least four slots.

[0010] In one embodiment, the first cut edge segment and / or the second cut edge segment includes a straight cut edge; or

[0011] The first cut edge segment and / or the second cut edge segment include multiple straight cut edges and at least one curved cut edge; or

[0012] The first cut edge segment and / or the second cut edge segment include multiple straight cut edges.

[0013] In one embodiment, 60mm ≤ L1 ≤ 200mm.

[0014] In one embodiment, the inner diameter of the stator core is R, where 30mm ≤ R ≤ 100mm.

[0015] This utility model also proposes an electric motor, including a rotor and a stator as described above, wherein the rotor is a squirrel-cage structure.

[0016] This utility model also proposes a compressor, including the motor described above.

[0017] This utility model also proposes a refrigeration device, including the compressor described above.

[0018] In this utility model's technical solution, the stator is installed on an external device, so that the first tangent segment and the external device enclose a groove (i.e., the tangent groove mentioned later). That is, the tangent groove is a groove formed by the extension lines of the first tangent segment and the adjacent arc segment. Coolant flows through the tangent groove, thereby carrying away heat from the stator core, thus dissipating heat from the stator and motor. The tangent grooves are arranged in pairs opposite each other. The diameter of the arc segment is L1, and the shortest distance between two symmetrically arranged first tangent segments is L2. Therefore, if... If L2 > 1.2, it indicates that L2 is too small compared to L1, meaning the minimum distance between two symmetrical points on the first tangent segment of each group is too small. This results in an insufficient thickness of the stator yoke along the radial direction of the stator core, leading to local over-saturation of the stator yoke magnetic field and consequently reducing motor efficiency. If... If L2 is less than 1.02, it indicates that L2 is too large compared to L1. This means the minimum distance between two symmetrical points on the first tangent segment of each group is too large, resulting in a shallow tangent groove depth. Consequently, the groove used for refrigerant flow is too small, reducing heat dissipation and consequently motor efficiency. Therefore, by setting 1.02 ≤ L1... Within the range of ≤1.2, the size of the cutting groove is set within a reasonable range, which reduces the local oversaturation of the stator magnetic field and improves the cooling effect of the refrigerant in the cutting groove, thereby improving the heat dissipation effect of the stator and motor, and thus improving the motor efficiency and stability. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a structural schematic diagram of a stator embodiment one provided by this utility model;

[0021] Figure 2 This is a structural schematic diagram of a stator embodiment one provided by this utility model;

[0022] Figure 3 This is a structural schematic diagram of a stator embodiment one provided by this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the second embodiment of the stator provided by this utility model;

[0024] Figure 5 This is a structural schematic diagram of the third embodiment of the stator provided by this utility model.

[0025] Explanation of icon numbers:

[0026] 10. Stator core; 11. Stator yoke; 111. First tangent section; 112. Second tangent section; 113. Tangent slot; 113a. First tangent slot; 113b. Second tangent slot; 12. Stator slot; 121. First stator slot; 122. Second stator slot; 20. Rotor.

[0027] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0029] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0030] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0031] Reference Figure 1 , Figure 4 as well as Figure 5 This utility model proposes a stator, comprising:

[0032] The stator core 10 includes a stator yoke 11. The outer peripheral wall of the stator yoke 11 includes at least one set of first tangent segments 111 and at least one set of arc segments. Each set of first tangent segments 111 includes two symmetrically arranged first tangent segments 111. Each set of arc segments includes two symmetrically arranged arc segments. The arc segments are connected to the first tangent segments 111. The diameter of the arc segment is L1. The shortest distance between the two symmetrically arranged first tangent segments 111 is L2, 1.02 ≤ ≤1.2.

[0033] In this utility model's technical solution, the stator is installed on an external device, so that the first cut edge segment 111 and the external device enclose a groove (i.e., the cut edge groove 113 mentioned later). That is, the cut edge groove 113 is a groove formed by the extension lines of the first cut edge segment 111 and the adjacent arc segment. Coolant flows through the cut edge groove 113, thereby carrying away heat from the stator core 10, thus dissipating heat from the stator and motor. The cut edge grooves 113 are arranged in pairs opposite each other. The diameter of the arc segment is L1, and the shortest distance between two symmetrically arranged first cut edge segments 111 is L2. Therefore, if... If L2 > 1.2, it indicates that L2 is too small compared to L1, meaning the minimum distance between two symmetrical points on the first tangent segment 111 of each group is too small. This results in the stator yoke 11 having too small a thickness along the radial direction of the stator core 10, leading to local over-saturation of the magnetic field in the stator yoke 11 and consequently reducing motor efficiency. However, if... If L2 is less than 1.02, it indicates that L2 is too large compared to L1. This means the minimum distance between two symmetrical points on the first tangent segment 111 of each group is too large, resulting in a shallow depth of the tangent groove 113. Consequently, the tangent groove 113 used for refrigerant flow is too small, reducing heat dissipation and consequently motor efficiency. Therefore, by setting 1.02 ≤ L1... Within the range of ≤1.2, the size of the cutting groove 113 is set within a reasonable range, thereby reducing the local oversaturation of the stator magnetic field and improving the cooling effect of the refrigerant in the cutting groove 113, which in turn improves the heat dissipation effect of the stator and the motor, and thus improves the motor efficiency and motor stability.

[0034] The method for measuring L1 is as follows: select two midpoints on two symmetrically set arc segments, and the distance between the two midpoints is L1.

[0035] The method for measuring L2 is as follows: select two midpoints on two symmetrically set first tangent segments, and the distance between the two midpoints is L2.

[0036] It should be emphasized that the shortest distance between the two symmetrically arranged first tangent segments 111 is L2. Here, symmetry refers to symmetry with respect to the center of the rotor 20 core.

[0037] Reference Figures 1 to 3Specifically, the maximum thickness of the stator yoke 11 along the radial direction of the stator core 10 is W1, and the minimum thickness of the stator yoke 11 along the radial direction of the stator core 10 is W2, where W1-W2≤0.5mm. Ideally, W1=W2 is best, as this ensures a consistent thickness of the stator yoke 11 along the radial direction of the stator core 10, resulting in a more uniform magnetic field length on the stator core 10, leading to a more uniform magnetic field distribution and improved motor efficiency; it also reduces magnetic field fluctuations, thereby lowering motor noise and vibration. However, considering the inevitable errors in the actual manufacturing process of the stator core 10, and taking into account the design of the stator slot 12, W1-W2≤0.5mm is used. This reduces the precision requirements of the stator core 10 during production, thereby reducing the manufacturing difficulty and cost of the stator core 10.

[0038] The measurement method for W1 is as follows: select the point on the wall of the first stator slot 121 that is farthest from the center of the circle as the first measurement point, then draw a line connecting the first measurement point and the center of the circle, and the intersection of the extension of the connecting line and the closest arc segment is the second measurement point. Then measure the distance between the first measurement point and the second measurement point, which is W1.

[0039] The measurement method for W2 is as follows: Select the point on the second stator slot wall 122 that is farthest from the center as the first measurement point. Then, draw a vertical line perpendicular to the first tangent segment from the first measurement point. The intersection of this vertical line and the first tangent segment is the second measurement point. The distance between the first measurement point and the second measurement point is then measured, which is W2. There should be two second measurement points, one above the other, because the first tangent segment 111 is symmetrically arranged. Here, W2 refers to the second measurement point that is closest to the first measurement point.

[0040] In one embodiment, a plurality of stator slots 12 are formed within the stator core 10. Each stator slot 12 includes a first stator slot 121 and a second stator slot 122. The cross-sectional area of ​​the first stator slot 121 is larger than that of the second stator slot 122. The outer peripheral wall of the stator yoke 11 also includes at least one set of second tangent segments 111. Each set of second tangent segments 112 includes two symmetrically arranged second tangent segments 112. The length of the first tangent segment 111 is greater than the length of the second tangent segment 112. The first stator slot 121, the second tangent segment 112, and the arc segment are arranged opposite to each other. The second stator slot 122 is arranged opposite to the first tangent segment 111. It is understood that because tangent slots 113 are provided on the outer peripheral wall of the stator yoke 11, the thickness of the stator yoke 11 corresponding to the tangent slot 113 is relatively small. This can lead to local oversaturation of the stator magnetic field, thereby reducing motor efficiency. Therefore, a smaller second stator slot 122 needs to be provided at the position opposite to the cutting groove 113. This makes the thickness of the stator yoke 11 corresponding to the first stator slot 121 and the second stator slot 122 more uniform. The uniform thickness of the stator yoke 11 ensures that the magnetic flux is evenly distributed in the magnetic circuit, reducing magnetic reluctance and magnetic leakage, thereby improving electromagnetic torque and efficiency. It also reduces the excessive saturation of the stator magnetic field, thus improving the efficiency of the motor. At the same time, the uniform thickness of the stator yoke 11 enhances its mechanical strength, enabling it to withstand greater mechanical and thermal stresses, thereby improving the stability and reliability of the stator core 10. Furthermore, the uniform thickness of the stator yoke 11 improves the space utilization of the motor and reduces material waste and manufacturing costs. The uniform thickness of the stator yoke 11 also ensures that the motor has lower losses during operation, thereby improving efficiency. Finally, the uniform thickness of the stator yoke 11 also reduces magnetic field fluctuations, thereby reducing motor noise and vibration, thus improving the user experience and the service life of the motor.

[0041] Reference Figure 3 In one embodiment, the groove formed by the extension of the first tangent segment 111 or the second tangent segment 112 and the adjacent arc segment is defined as a tangent groove 113. The tangent groove 113 includes a first tangent groove 113a and a second tangent groove 113b that are connected. The minimum groove depth of the first tangent groove 113a is equal to the maximum groove depth of the second tangent groove 113b. The minimum groove depth of the first tangent groove 113a is h, where h ≥ 1.5 mm. The sum of the cross-sectional areas of the plurality of tangent grooves 113 is S1, and the sum of the cross-sectional areas of the plurality of first tangent grooves 113a is S2. ≥0.8. Among them, the grooves formed by the first tangent segment 111 and the second tangent segment 112 and the extension lines of the adjacent arc segments are both tangent grooves 113.

[0042] The first cutting groove 113a and the second cutting groove 113b are connected. That is, the solid line in the first cutting groove 113a is actually just an auxiliary line to distinguish the first cutting groove 113a and the second cutting groove 113b, and is not the groove wall of the first cutting groove 113a or the second cutting groove 113b.

[0043] It should be noted that in Embodiment 1, each trimming groove 113 includes one first trimming groove 113a and two second trimming grooves 113b. The two second trimming grooves 113b are respectively located on both sides of the first trimming groove 113a, with h ≥ 1.5mm. This means that the first trimming groove 113a is the part with a groove depth greater than or equal to 1.5mm, and the second trimming grooves 113b are the parts with a groove depth less than 1.5mm. In Embodiments 2 and 3, since the groove depths of the trimming grooves 113 are basically consistent, this mainly means that errors are inevitable in the production and processing of the stator core 10. Therefore, the groove depths of the trimming grooves 113 will not be completely consistent. Thus, without considering processing errors, the groove depths of the trimming grooves 113 in Embodiments 2 and 3 are basically consistent. Therefore, the trimming grooves 113 in Embodiments 2 and 3 can all be the first trimming groove 113a or all be the second trimming grooves 113b.

[0044] Understandably, only the deeper kerfed groove 113 can effectively facilitate airflow and achieve better heat dissipation; it also facilitates oil return, preventing excessive oil accumulation on the compressor motor from being carried to the outside of the compressor, thus ensuring sufficient oil lubrication inside the compressor. The heat dissipation effect of the second kerfed groove 113b is limited; that is, the heat dissipation effect of the first kerfed groove 113a is significantly improved compared to the second kerfed groove 113b. However, if... If the value is less than 0.8, it indicates that the proportion of the first tangential groove 113a is relatively small, resulting in lower refrigerant flow and consequently poor heat dissipation. Therefore, through... ≥0.8, thereby increasing the proportion of the first cutting groove 113a, thereby improving the flow effect of the refrigerant in the cutting groove 113, thereby improving the heat dissipation effect of the motor, and thus improving the motor efficiency.

[0045] At the same time, it should be emphasized that due to errors in the actual production and processing of the stator core 10, the cross-sectional area of ​​each stator slot 12 is actually different. Therefore, if the cross-sectional area of ​​the stator slot 12 does not exceed 5%, even if the cross-sectional areas of the stator slot 12 are different, we still consider the two stator slots 12 to belong to the same type of stator slot 12, that is, both belong to the first stator slot 121 or both belong to the second stator slot 122.

[0046] Specifically, at least four second stator slots 122 are provided. Understandably, by rationally setting the number of second stator slots 122, the thickness of the stator yoke 11 along the radial direction of the stator core 10 is optimized, resulting in a more uniform thickness of the stator yoke 11 along the radial direction of the stator core 10. A uniformly thick stator yoke 11 ensures uniform distribution of magnetic flux in the magnetic circuit, reducing magnetic reluctance and leakage, thereby improving electromagnetic torque and efficiency. It also reduces excessive saturation of the stator magnetic field, further improving motor efficiency. Simultaneously, the uniform thickness of the stator yoke 11 enhances its mechanical strength, enabling it to withstand greater mechanical and thermal stresses, thus improving the stability and reliability of the stator core 10. Furthermore, a uniformly thick stator yoke 11 improves the space utilization of the motor and reduces material waste and manufacturing costs. The uniform thickness of the stator yoke 11 also ensures lower losses during motor operation, thereby improving efficiency. Finally, a uniformly thick stator yoke 11 also reduces magnetic field fluctuations, thereby reducing motor noise and vibration, improving user experience and extending motor lifespan.

[0047] Reference Figures 1 to 3 In Embodiment 1, the first cutting edge segment 111 and / or the second cutting edge segment 112 includes a straight cutting edge. That is, both the first cutting edge segment 111 and the second cutting edge segment 112 include only one straight cutting edge segment. In this case, the straight cutting edge can improve the electromagnetic performance of the motor, reduce magnetic reluctance, increase magnetic flux density, reduce local oversaturation of the stator magnetic field, and thus improve the efficiency of the motor. At the same time, the straight cutting edge can also facilitate the installation of the stator, play a positioning role, and ensure the assembly accuracy and operational stability of the motor.

[0048] Reference Figure 4 and Figure 5 In embodiments two and three, the first tangent segment 111 and / or the second tangent segment 112 include multiple straight tangents and at least one arc tangent. This arc tangent can be a regular circular arc or an irregular arc. This reduces the thickness error of the stator along the radial direction of the stator core 10, thereby improving the electromagnetic performance of the motor, reducing magnetic reluctance, increasing magnetic flux density, and reducing local over-saturation of the stator magnetic field, thus improving the efficiency of the motor. The opening of the tangent groove 113 remains constant in the direction away from the stator core 10, which facilitates the manufacturing of the stator core 10, reduces the manufacturing difficulty of the stator core 10, and thus reduces the manufacturing cost of the stator core 10.

[0049] Of course, in other embodiments, the first cut edge segment 111 and / or the second cut edge segment 112 include multiple straight cut edges. That is, similar to... Figure 4 and Figure 5The curved edge in the figure can be replaced with a straight edge. Alternatively, the first edge segment 111 can be the one with only a straight edge as in Embodiment 1, while the other second edge segment 112 can be a combination of two straight edges and one curved edge as in Embodiment 2. These will not be described in detail here.

[0050] The opening width of the cutting groove 113 can also be designed to gradually increase in the direction away from the center of the stator core 10. Understandably, the corners of the stator slot 12 are chamfered. Therefore, if the opening width of the cutting groove 113 is set to a constant width, the thickness of the stator yoke 11 at the chamfered corners will be uneven. Therefore, by gradually increasing the opening width of the cutting groove 113 in the direction away from the center of the stator core 10, the thickness of the stator yoke 11 can be made more uniform, thereby making the magnetic field distribution on the stator more uniform, thus improving the efficiency of the motor; reducing magnetic field fluctuations, thereby reducing the noise and vibration of the motor.

[0051] Specifically, 60mm≤L1≤200mm. By setting a larger range of stator core 10 outer diameters, designers can more flexibly select the structural and material parameters of stator core 10, and reduce the manufacturing precision requirements of stator core 10, thereby reducing the manufacturing cost of stator core 10 and improving the production efficiency of stator core 10.

[0052] The inner diameter of the stator core 10 is R, where 30mm ≤ R ≤ 100mm. By setting a wider range of inner diameters for the stator core 10, designers can more flexibly select the structural and material parameters of the stator core 10, and the manufacturing precision requirements for the stator core 10 are reduced, thereby lowering the manufacturing cost of the stator core 10 and improving its production efficiency.

[0053] This utility model also proposes an electric motor, which includes a rotor 20 and a stator. The specific structure of the stator is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0054] Furthermore, the rotor 20 has a squirrel-cage structure. A squirrel-cage motor is a type of three-phase asynchronous motor. The squirrel-cage rotor 20 is the rotating part of the squirrel-cage motor. Generally, copper or aluminum rotor coils are cast into the slots of the cage on the rotor core. This coil is a closed loop, not connected to other parts, and its main function is to suppress stator current. The rotor 20 of the squirrel-cage motor has a simple structure and does not require a separate commutator, thus simplifying the overall structure and reducing the motor's manufacturing cost.

[0055] This utility model also proposes a compressor, which includes a motor. The specific structure of the motor is as described in the above embodiments. Since this compressor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0056] This utility model also proposes a refrigeration device, which can be divided into compression refrigeration devices, absorption refrigeration devices, vapor jet refrigeration devices, heat pump refrigeration devices, and electric heating refrigeration devices, etc. The refrigeration device mainly includes a motor, compressor, electronic expansion valve, evaporator, condenser, accessories, and piping. Examples include refrigerators and air conditioners. The specific structure of the electronic expansion valve is as described in the above embodiments. Since the refrigeration device in this utility model adopts all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0057] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stator characterized by, Comprise: The stator core comprises a stator yoke, an outer peripheral wall of the stator yoke comprises at least one set of first cut edge segments and at least one set of circular arc segments, each set of the first cut edge segments comprises two first cut edge segments symmetrically arranged, each set of the circular arc segments comprises two circular arc segments symmetrically arranged, the circular arc segments are connected with the first cut edge segments, a diameter of the circular arc segments is L1, a shortest distance between the two first cut edge segments symmetrically arranged is L2, 1.02≤L2 / L1≤1.

2. 1.

2.

2. The stator of claim 1, wherein The maximum thickness of the stator yoke along the radial direction of the stator core is W1, and the minimum thickness of the stator yoke along the radial direction of the stator core is W2, W1-W2≤0.5mm.

3. The stator of claim 1, wherein A plurality of stator slots are formed in the stator core, the stator slots comprising first stator slots and second stator slots, the cross-sectional area of the first stator slots being greater than that of the second stator slots, the outer peripheral wall of the stator yoke further comprising at least one group of second cut edge segments, each group of the second cut edge segments comprising two symmetrically arranged second cut edge segments, the length of the first cut edge segments being greater than that of the second cut edge segments, the first stator slots being arranged opposite to the second cut edge segments and the circular arc segments, and the second stator slots being arranged opposite to the first cut edge segments.

4. The stator of claim 3, wherein The slot enclosed by the first or second cut edge section and the extension line of the adjacent circular arc section is defined as a cut edge slot, the cut edge slot comprises a first cut edge slot and a second cut edge slot connected in communication, the minimum slot depth of the first cut edge slot is equal to the maximum slot depth of the second cut edge slot, the minimum slot depth of the first cut edge slot is h, h≥1.5mm, the sum of the cross-sectional areas of a plurality of the cut edge slots is S1, the sum of the cross-sectional areas of a plurality of the first cut edge slots is S2, ≥0.

8.

5. The stator of claim 3, wherein The second stator slots are provided with at least 4.

6. The stator of claim 3, wherein The first cut edge segment and / or the second cut edge segment comprises a straight cut edge; or The first cut edge segment and / or the second cut edge segment comprises a plurality of straight cut edges and at least one arc cut edge; or The first cut edge segment and / or the second cut edge segment comprises a plurality of straight cut edges.

7. The stator of claim 1, wherein 60mm≤L1≤200mm.

8. The stator of claim 1, wherein The inner diameter of the stator core is R, 30mm≤R≤100mm.

9. An electric machine characterized by The motor comprises a rotor and a stator as claimed in any one of claims 1 to 8, the rotor being of a squirrel cage structure.

10. A compressor characterized by, The motor as claimed in claim 9.

11. A refrigeration appliance characterized in that, The compressor as claimed in claim 10.

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