Stator core, motor and compressor

Abstract

The invention discloses a stator core, a motor and a compressor, and relates to the technical field of motors, the stator core comprises a plurality of laminated stator punching sheets, each stator punching sheet comprises a stator yoke part and a plurality of stator tooth parts arranged at the inner side of the stator yoke part, and a stator slot is defined between two adjacent stator tooth parts; the outer periphery of each stator punching sheet is provided with a plurality of first trimmings along the circumferential direction; the first cut edge is arranged in a penetrating manner along the axial direction of the stator core, the maximum depth of the first cut edge in the radial direction of the stator punching sheet is H1, and H1 is greater than or equal to 1.5 mm; the sum of the areas of the stator grooves of the stator punching sheet is S1, the sum of the areas of the stator yoke part and the stator tooth part of the stator punching sheet is S2, and the relation that S1 / S2 is larger than or equal to 0.39 and smaller than or equal to 0.51 is met. According to the technical scheme provided by the invention, the performance of the motor and compressor system is improved through the design of the structural parameters of the stator core.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator core, an electric machine and a compressor. BACKGROUND

[0002] In high-efficiency power equipment such as compressors and new energy vehicle driving electric machines, the stator core as the core component of the magnetic circuit of the electric machine directly affects the electromagnetic performance, vibration noise and system energy efficiency. With the upgrading of household appliance energy efficiency standards and the increasing demand for new energy vehicle endurance, the electric machine system needs to meet the requirements of "high efficiency, low noise and miniaturization".

[0003] In the design of an electric machine, by optimizing the cut edge, the efficiency of the electric machine can be improved, and the flow field distribution inside the compressor can be improved, thereby reducing the noise of the compressor, improving the heat dissipation of the compressor and the electric machine and improving the energy efficiency of the compressor. However, if the stator cut edge is not properly designed, it may cause uneven electromagnetic force distribution of the electric machine, causing vibration of the stator core or the shell. Such vibration can be transmitted to the compressor pump body through the mechanical structure, interfere with the internal flow field of the compressor, cause the flow loss of the refrigerant to increase, and thus cause the compressor to have problems such as noise, uneven heat dissipation and reduced efficiency. SUMMARY

[0004] The main purpose of the present application is to provide a stator core, an electric machine and a compressor, which aims to improve the performance of the electric machine and the compressor system through the design of the structure parameters of the stator core.

[0005] To achieve the above-mentioned purpose, the stator core provided by the present application comprises: a plurality of stator laminations arranged in stacks, the stator lamination comprising a stator yoke portion and a plurality of stator tooth portions arranged on the inner side of the stator yoke portion, and a stator slot being defined between adjacent two stator tooth portions; a plurality of first cut edges are arranged on the outer periphery of each stator lamination in the circumferential direction; the first cut edges are arranged through the stator core in the axial direction, the maximum depth of the first cut edge in the radial direction of the stator lamination is H1, and H1≥1.5mm; the total area of the stator slots of the stator lamination is S1, the total area of the stator yoke portion and the stator tooth portion of the stator lamination is S2, and the relationship 0.39≤S1 / S2≤0.51 is satisfied.

[0006] In an embodiment, the first cut edges are circumferentially distributed on the outer periphery of the stator yoke portion, and the circumferential angle of a single first cut edge corresponds to an angle a, wherein: 1

[0007] In an embodiment, the stator lamination is provided with a rivet portion for stacking connection, and a second cut edge is further arranged on the outer periphery of the stator lamination in the circumferential area corresponding to the rivet portion, and the maximum depth of the second cut edge in the radial direction of the stator core is H2, and H2<1.5mm.

[0008] In an embodiment, the second cut edges are circumferentially distributed on the outer periphery of the stator yoke portion, and the central angle of each of the second cut edges is β, where 0≤n≤16 and 4°≤β≤31°.

[0009] In an embodiment, the radius of the stator core is R, where R, α, β, S1, and S2 satisfy the relationship .

[0010] In an embodiment, the maximum inner diameter of the stator core is D, where 90mm≤D≤200mm.

[0011] In an embodiment, the maximum yoke width of the stator yoke portion in the radial direction of the stator core is L1, and the minimum yoke width is L2, and the relationship 0≤L1-L2≤0.5mm is satisfied.

[0012] In an embodiment, the first cut edge is a non-concentric curved surface structure or a groove structure opening toward the outer periphery formed by material removal on the outer periphery of the stator yoke portion, and it makes the outer circle of the stator core a non-integer circle contour.

[0013] The application also provides a motor comprising the stator core as described above.

[0014] The application also provides a compressor comprising the motor as described above.

[0015] The technical solution of the application balances the slot winding space and the yoke magnetic conduction area by limiting the ratio of the total stator slot area to the total core area to 0.39≤S1 / S2≤0.51, avoids magnetic circuit saturation, reduces iron loss and copper loss, and improves motor efficiency. The first cut edge on the outer periphery (depth H1≥1.5mm) optimizes the magnetic conduction path of the stator outer periphery, makes the radial electromagnetic force distribution more uniform, reduces the amplitude of core vibration, reduces electromagnetic force fluctuation, and improves motor operation stability. When applied to a compressor, the interference of vibration on the internal flow field of the compressor is suppressed, the refrigerant vortex and pressure loss are reduced, and the overall energy efficiency ratio of the compressor is improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor based on the drawings shown.

[0017] Figure 1 The structural schematic diagram of an embodiment of the stator core provided by the application is shown in the figure. Figure 2 Structure diagram of another embodiment of the stator core provided by the present application; Figure 3 Structure diagram of another embodiment of the stator core provided by the present application; Figure 4 Structure diagram of an embodiment of the first cut edge and the second cut edge; Figure 5 Structure diagram of an embodiment of the maximum yoke width and the minimum yoke width of the stator yoke; Figure 6 Structure diagram of an embodiment of all the first cut edges and all the second cut edges; Figure 7 Structure diagram of an embodiment of the first cut edge; Figure 6 Structure diagram of an embodiment of the second cut edge; Figure 8 Figure 6 Structure diagram of an embodiment of the second cut edge; Figure 9 The line graph of the performance improvement percentage of the electronic core after improvement relative to that before improvement at different ratios.

[0018] Explanation of the reference signs: 100, stator core; 110, stator lamination; 111, stator yoke; 112, stator tooth; 113, stator slot; 114, first cut edge; 115, second cut edge.

[0019] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0021] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture, and if the certain posture changes, the directional indications also change accordingly.

[0022] ​In addition, if the description of "first", "second" and the like is involved in the embodiments of the present application, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, if "and / or" or "and / or" appears throughout the text, it means that the three parallel schemes are included, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0023] In the compressor, new energy automobile driving motor and other high-efficiency power equipment, the stator core as the core component of the motor magnetic circuit, its design directly affects the electromagnetic performance, vibration noise and system energy efficiency. With the upgrading of household appliance energy efficiency standards and the increasing demand for new energy vehicle endurance, the motor system needs to meet the requirements of "high efficiency, low noise and miniaturization".

[0024] In the design of the motor, by optimizing the cutting edge, not only can improve the efficiency of the motor, but also can improve the flow field distribution in the compressor, thereby reducing the noise of the compressor, improving the heat dissipation of the compressor and motor and improving the energy efficiency of the compressor. However, if the stator cutting edge is not properly designed, it may cause uneven electromagnetic force distribution of the motor, causing vibration of the stator core or the shell. This vibration will be transmitted to the compressor pump body through the mechanical structure, interfere with the internal flow field of the compressor, cause the loss of refrigerant flow to increase, and thus cause the compressor to have the problems of noise, uneven heat dissipation and efficiency reduction.

[0025] Therefore, the present application provides a stator core, which realizes the improvement of the performance of the motor and the compressor system through the precise design of the structural parameters.

[0026] Please refer to Figures 1 to 8 In an embodiment of the present application, the stator core 100 comprises: a plurality of stator laminations 110 arranged in a stack, the stator laminations 110 comprising a stator yoke portion 111 and a plurality of stator tooth portions 112 arranged inside the stator yoke portion 111, and a stator slot 113 defined between adjacent two stator tooth portions 112; a plurality of first cutting edges 114 are arranged on the outer periphery of each stator lamination 110 in the circumferential direction; the first cutting edges 114 are arranged through the stator core 100 in the axial direction, the maximum depth of the first cutting edges 114 in the radial direction of the stator lamination 110 is H1, and H1 is greater than or equal to 1.5 mm; the total area of the stator slots 113 of the stator laminations 110 is S1 Figure 1S1 (the area of the shadow part in FIG. 1) and the sum of the areas of the stator yoke part 111 and the stator tooth part 112 of the stator lamination 110 is S2 (the area of the shadow part in FIG. 2). Figure 2 S1 / S2 satisfies the relationship: 0.39≤S1 / S2≤0.51.

[0027] The stator core 100 includes a plurality of stator laminations 110 arranged in a stack, which are stacked and fixed (such as welded, buckling) in multiple layers to improve the overall mechanical strength of the core and reduce eddy current loss. The stator lamination 110 is formed by stamping a silicon steel sheet. The stator yoke part 111 is a ring-shaped part located at the outer periphery of the stator lamination 110, which is a key component of the magnetic circuit, responsible for closing the magnetic field of each stator tooth part 112, and ensuring uniform distribution of magnetic flux. The stator tooth part 112 is a tooth-like structure uniformly distributed along the inner side of the yoke part, used for winding the winding (enamel wire), and generates a rotating magnetic field through the current, which interacts with the rotor magnetic field to generate an electromagnetic torque. The stator slot 113 is used to accommodate the winding, and its shape and size directly affect the winding arrangement density (slot fill rate) and electromagnetic force waveform. Improving the slot fill rate can reduce copper loss.

[0028] The first cut edge 114 is obtained by cutting part of the outer periphery of the lamination, used to adjust the air gap magnetic field distribution, suppress low-order harmonics, and reduce electromagnetic force fluctuations. A plurality of first cut edges 114 are distributed along the circumference (such as 2, 4, 6, 8, etc.). The first cut edge 114 is arranged along the axial direction of the stator core 100, and the first cut edge 114 extends from one end of the core to the other end (through the entire axial height), ensuring the consistency of electromagnetic performance along the height direction of the core, and avoiding the intensification of magnetic field distortion and vibration caused by local cut edges.

[0029] H1 is the maximum radial depth of the first cut edge 114, and a depth ≥1.5mm can effectively change the magnetic path, reduce the amplitude of electromagnetic force harmonics. If the depth is insufficient (<1.5mm), the optimization effect is not significant, or even ineffective. The depth H1 of the first cut edge 114 is a key parameter in the design of the stator core 100, and its value needs to consider multiple factors such as electromagnetic performance, structural strength, vibration suppression effect, and manufacturing process. If H1 is too large, it will reduce the effective magnetic conduction area of the stator yoke part 111, increase the risk of magnetic circuit saturation, increase the excitation current, increase the iron loss, and reduce the efficiency of the motor. Therefore, it is necessary to ensure that the remaining thickness of the yoke part after the first cut edge 114 can still meet the magnetic flux transmission requirements. The depth of the first cut edge 114 affects the air gap magnetic field distribution by changing the magnetic conduction path of the outer periphery of the stator. If H1 is too small, it may not be able to effectively optimize the electromagnetic force harmonic components, resulting in insufficient vibration suppression effect; if it is too large, it may introduce new magnetic field distortion, which may even exacerbate local electromagnetic force concentration. Therefore, the lower limit of H1 (≥1.5mm): based on the minimum requirement of the vibration suppression effect, to ensure that the cut edge can effectively adjust the electromagnetic force distribution; H1 upper limit: limited by the comprehensive constraints of magnetic circuit saturation, structural strength, manufacturing process and system integration, it needs to be determined by multi-variable iterative optimization (usually need to be customized according to specific motor power level and compressor model). The maximum depth of H1 can be designed according to the actual stator size, and generally will not exceed half of the yoke width of the stator yoke 111.

[0030] S1 represents the winding space, the larger the area, the more or thicker the wire can be accommodated, reducing copper loss, S2 represents the total amount of core magnetic conductive material, which directly affects the saturation degree of the magnetic circuit, and the ratio of S1 / S2 is limited to 0.39-0.51: balance the slot area (winding space) and the magnetic conductive area (magnetic circuit performance), when the ratio is <0.4, the slot fill rate is insufficient (copper loss increases), and when the ratio is >0.5, the magnetic conductive area is insufficient (iron loss increases). The scheme can improve the overall energy efficiency ratio of the compressor under a larger slot fill rate.

[0031] When the ratio of S1 / S2 of the total area of the stator slot 113 of the stator lamination 110 to the total area of the stator yoke 111 and the tooth area is >0.51 (the slot area ratio is too large), the magnetic conductive area is insufficient, and the electromagnetic force distribution is uneven; secondly, the stiffness of the stator core 100 is reduced, the yoke is the main supporting structure, and the reduction of the area will weaken the overall anti-vibration ability, and under the action of electromagnetic force and mechanical stress, it is more prone to deformation, which further amplifies vibration and noise; and the edge design is not coordinated, and the yoke with too small area may form stress concentration at the edge, increasing the risk of core fracture.

[0032] When the ratio of S1 / S2 of the total area of the stator slot 113 of the stator lamination 110 to the total area of the stator yoke 111 and the tooth area is <0.39 (the slot area ratio is too small), the slot area is too small to limit the winding and the number of turns, resulting in a decrease in air gap magnetic field strength and a decrease in motor output torque. Although the increase in yoke area may enhance the structural stability, the small slot area will cause the electromagnetic efficiency of the motor to decrease, and the output needs to be compensated by increasing the current, which may increase the current harmonics and cause electromagnetic noise, which offsets the noise reduction effect of the edge design.

[0033] The technical scheme of the present application balances the winding space in the slot and the yoke magnetic conductive area by limiting the ratio of the total area of the stator slot 113 to the total area of the core to 0.39≤S1 / S2≤0.51, avoids magnetic circuit saturation, reduces iron loss and copper loss, and improves motor efficiency. The first outer edge 114 (depth H1≥1.5mm) optimizes the magnetic path of the stator outer periphery, makes the radial electromagnetic force distribution more uniform, reduces the amplitude of core vibration, reduces electromagnetic force fluctuation, and improves motor running stability. When applied to a compressor, the interference of vibration on the internal flow field of the compressor is suppressed, the refrigerant vortex and pressure loss are reduced, and the overall energy efficiency ratio of the compressor is improved.

[0034] Regarding the H1 (the maximum radial depth of the first cut edge 114) measurement, use a vernier caliper or other tool to take any one stator core 100 stator lamination 110 (if the core has been assembled, it needs to be disassembled and separated into single lamination); observe the outer periphery of the lamination, identify the "first cut edge 114" (recess structure distributed in the circumferential direction); determine the "radial direction" of the cut edge: take the center of the lamination as the origin, measure along the radial direction; measure the "maximum depth" of the cut edge: the shortest radial distance from the outer periphery of the lamination (the circular arc part without cut edge) to the bottom of the cut edge, which is H1 (take the maximum value among all cut edges); the judgment standard: if H1≥1.5mm, it meets the requirements of the scheme.

[0035] Regarding S1 (the total area of the stator slots 113), place the stator lamination 110 flat, and use a scanner to obtain a high-definition image of the lamination (which needs to include the complete contour and slot details), or use paper to obtain the image. In the software, outline the contour of a single stator slot 113 (the area between two adjacent tooth parts), calculate the area of a single slot; count the total number of stator slots 113 on the lamination (such as 24 slots, 36 slots), multiply the area of a single slot by the number of slots to obtain S1.

[0036] Regarding S2 (the total area of the stator yoke 111 and tooth parts), outline the contours of "stator yoke 111" (annular area within the outer periphery and outside the tooth part) and "all stator tooth parts 112" (including tooth top, tooth body, tooth root) in the image of the stator lamination 110, respectively; use software to calculate the yoke area and tooth area, and sum them to obtain S2.

[0037] Referring to Figure 3 and Figure 4 , specifically, the first cut edge 114 is distributed circumferentially along the outer periphery of the stator yoke 111 with m, and the central angle of a single first cut edge 114 is α, where: 1

[0038] To prevent defects such as flanging at the edge stamping location of the stator laminations 110 when the rivet portions are provided, the stator laminations 110 are further provided with rivet portions for stacking and connection. A second trim 115 is further provided on the outer periphery of the stator laminations 110 within the circumferential region corresponding to the rivet portions. The maximum depth of the second trim 115 in the radial direction of the stator core 100 is H2, where H2 is less than 1.5 mm. Deformation of the rivet portions due to stamping may cause local magnetic permeability anomalies. The second trim 115 compensates for magnetic field distortion by adjusting the outer peripheral shape of this region and avoids electromagnetic force concentration near the rivet portions. H2 less than 1.5 mm prevents the second trim 115 from being too deep, which could weaken the connection strength of the rivet portions. It also prevents the second trim 115 from affecting the local magnetic field of the first trim 114 due to its depth. It also prevents the material at the base of the rivet portions from being too thin, which could lead to rivet breakage or deformation during stacking. This reduces challenges to the stamping process (such as preventing burrs and springback on the lamination edges) and ensures the forming accuracy of the rivet portions.

[0039] Reference Figure 4 Specifically, n second cutting edges 115 are distributed circumferentially around the outer periphery of the stator yoke 111. Each second cutting edge 115 corresponds to a central angle β, where 0 ≤ n ≤ 16 and 4° ≤ β ≤ 31°. The angle β must match the circumferential dimensions of the rivet buckle (for example, if the circumferential width of the rivet buckle corresponds to a central angle of 2°-15°, β is typically set at 4°-25° to ensure that the cutting edge completely covers the rivet buckle area).

[0040] In some solutions where no rivet portion is provided, the second cutting edge 115 may not exist.

[0041] Specifically, the radius of the stator sheet 110 is R, wherein R, α, β, S1, and S2 satisfy the relationship: .

[0042] Among them, the central angle corresponding to a single first cut edge 114 is α, and the chord length of the first cut edge 114 corresponding to the central angle α is L, L=2R×sin(α / 2), that is, sin(α / 2)×2R is the chord length with a radius of R and a central angle of α, that is, the relevant parts in the numerator and denominator are the sum of multiple chord lengths corresponding to the corresponding angles α / β, which are used to constrain the parameter proportional relationship on the stator punching sheet 110 to meet the design requirements of motor performance (such as magnetic flux, loss, and mechanical strength).

[0043] Combine Figure 9 The following table shows the percentage change in performance of the electronic core "after improvement" compared to "before improvement" (how much the three key performance indicators have improved compared to the original state), that is, the percentage improvement of each performance indicator at different ratios.

[0044]

[0045] From the above table and Figure 9 , Figure 9 Mid Y-axis (Y-axis): represents the percentage (%) of improvement of the electronic core "after improvement" relative to "before improvement", ranging from 0.00% to 1.20%. Figure 9 Mid X-axis (X-axis): the ratio of the parameter:

[0046] It can be seen that when the above parameter ratio is constrained in the range of 0.42-0.48, the three key performance indicators are improved compared to the original state. Among them, the overall efficiency of the compressor system reflects the energy loss of the motor in the compressor system; the oil discharge amount is the amount of lubricating oil carried away by the high-pressure refrigerant gas discharged during the operation of the compressor.

[0047] Referring to Figures 6 to 8 Further, the total area of all the first cut edges 114 on any stator lamination 110 is s1, and the total area of all the second cut edges 115 is s2, and 0.972≤s1 / s2≤0.985.

[0048] The area of a single first cut edge 114 is approximately the radial depth (H1) of the cut edge x the circumferential width (related to the central angle α, width = R x α x π / 180, R is the radius of the lamination); s1 = m x the area of a single first cut edge 114 (m is the number of first cut edges 114, 1 < m ≤ 16); the area of a single second cut edge 115 is approximately the radial depth (H2) of the cut edge x the circumferential width (related to the central angle β, width = R x β x π / 180); s2 = n x the area of a single second cut edge 115 (n is the number of second cut edges 115, 0 ≤ n ≤ 16).

[0049] s1≈s2 ensures that the adjustment effect of the first cut edge 114 (full circumferential distribution) and the second cut edge 115 (rivet portion area distribution) on the magnetic field is balanced, avoiding local permeance mutation causing electromagnetic force fluctuation. If the cut edge area difference is too large, it will lead to stress concentration on the outer periphery of the lamination (for example, if s1 is much larger than s2, the first cut edge 114 region removes too much material, and the stiffness decreases). Within this range, it can ensure balanced electromagnetic action while ensuring structural strength, vibration suppression and stability of the manufacturing process.

[0050] Further, the maximum yoke width of the stator yoke portion 111 in the radial direction of the stator core 100 is L1, and the minimum yoke width is L2, satisfying the relationship: 0≤L1-L2≤0.5mm.

[0051] Specifically, the first cut edge 114 is a non-concentric curved surface structure or a groove structure opening towards the outer periphery formed by material removal of the outer periphery of the stator yoke portion 111, and it makes the outer circle of the stator core 100 present a non-integer circle contour. ​

[0052] Referring to Figure 5 , the maximum yoke width L1 is the thickest part of the stator yoke 111 in the radial direction (usually located at the circular arc segment between adjacent first cut edges 114, no cut edge region); the minimum yoke width L2 is the thinnest part of the stator yoke 111 in the radial direction (usually located at the bottom of the first cut edge 114, the region where the material is removed the most). The essence of the first cut edge 114 is to form a non-circular contour (such as an arc-shaped recess, a polygonal cut edge) by removing the material of the outer periphery, the purpose is to adjust the air gap magnetic field distribution and suppress electromagnetic force harmonics. The cut edge region material removal will directly reduce the yoke thickness, if the design is improper, it is easy to cause L1-L2 to exceed 0.5mm, causing magnetic circuit and structural problems.

[0053] The present application also provides an electric machine, which comprises a stator core 100, the specific structure of which is referred to the above-mentioned embodiments. Since the present electric machine adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the electric machine comprises a rotor assembly and a stator assembly, the rotor assembly and the stator assembly are in transmission cooperation, that is, through electromagnetic induction, the rotor rotates relative to the stator, so as to realize the conversion of electric energy into mechanical energy. After the winding of the stator assembly is connected with alternating current, a rotating magnetic field is generated; the rotor assembly usually contains a permanent magnet or an induced current, which is acted on by electromagnetic force (or electromagnetic torque) in the rotating magnetic field, rotates with the magnetic field, and forms a cooperation relationship of “fixed stator and rotating rotor”.

[0054] The present application also provides a compressor, which comprises a shell and an electric machine, the specific structure of which is referred to the above-mentioned embodiments. Since the present compressor adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here. Among them, the shell of the electric machine is configured as the compressor shell. The compressor shell simultaneously bears the functions of accommodating the compression mechanism and fixing the stator assembly and the rotor assembly, and is in transmission connection with the compression mechanism through the electric machine, which provides power for the compression mechanism (such as connecting the piston through the crankshaft, or directly driving the scroll plate).

[0055] The present application also provides a refrigeration equipment, which comprises the above-mentioned compressor. The refrigeration equipment is an air conditioner, a wall-mounted air conditioner indoor unit, a mini refrigerator, a kitchen refrigerator, a vehicle-mounted refrigeration equipment, etc. which adopts the above-mentioned compressor.

[0056] The above-mentioned is only an exemplary embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structural transformation made by referring to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

Claims

1. A stator core characterized by, include: A plurality of stacked stator punchings are provided, each of the stator punchings comprising a stator yoke and a plurality of stator teeth arranged on the inner side of the stator yoke, with a stator slot defined between two adjacent stator teeth; a plurality of first cutting edges are provided along the circumferential direction on the outer peripheral edge of each stator punching; the first cutting edges are provided axially through the stator core, and the maximum radial depth of the first cutting edges in the stator punching is H1, where H1 is ≥ 1.5 mm; the total area of ​​the stator slots of the stator punching is S1, and the total area of ​​the stator yoke and the stator teeth of the stator punching is S2, satisfying the relationship: 0.39≤S1 / S2≤0.

51.

2. The stator core of claim 1, wherein There are m first cut edges distributed along the circumferential direction on the outer periphery of the stator yoke, and the central angle corresponding to a single first cut edge is α, wherein: 1<m≤16, 4°≤α≤105°.

3. The stator core of claim 2, wherein The stator punching sheet is provided with a rivet portion for stacking connection, and the outer periphery of the stator punching sheet is further provided with a second cut edge in the circumferential area corresponding to the rivet portion. The maximum depth of the second cut edge in the radial direction of the stator core is H2, H2 < 1.5 mm.

4. The stator core of claim 3, wherein There are n second cut edges distributed along the circumferential direction on the outer periphery of the stator yoke, and the central angle corresponding to a single second cut edge is β, where 0≤n≤16, and 4°≤β≤31°.

5. The stator core of claim 4, wherein The radius of the stator punching sheet is R, where R, α, β, S1, and S2 satisfy the relationship: 。 6. The stator core of any one of claims 1 to 4, wherein, The maximum yoke width of the stator yoke in the radial direction of the stator core is L1, and the minimum yoke width is L2, which satisfy the relationship: 0≤L1-L2≤0.5mm.

7. The stator core of claim 1, wherein The maximum diameter of the stator core is D, 90 mm ≤ D ≤ 200 mm.

8. The stator core of claim 1, wherein, The first cutting edge is a non-concentric curved surface structure formed by removing material from the outer periphery of the stator yoke or a groove structure opening toward the outer periphery, and it makes the outer circle of the stator core present a non-circular contour.

9. An electric machine characterized by The invention comprises the stator core according to any one of claims 1 to 8.

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

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