Stator core, motor, compressor and refrigeration equipment

Abstract

The invention discloses a stator iron core, a motor, a compressor and refrigeration equipment, the stator iron core comprises a plurality of laminated stator punching sheets, each stator punching sheet is provided with Q stator grooves and N contact convex parts protruding towards the outer peripheral surface of the stator punching sheet, the N contact convex parts are arranged at intervals along the circumferential direction of the stator punching sheet, the Q stator grooves are formed in the Q stator grooves, and the N contact convex parts are arranged at intervals along the circumferential direction of the stator punching sheet. The relation between Q and N is X = Q / N, and X is an integer. According to the technical scheme, the overall rigidity after the stator shell and the stator iron core are subjected to hot jacket assembly can be improved, the inherent frequency of the stator is improved, resonance generated when the inherent frequency of the motor and the compressor is close to the frequency of electromagnetic exciting force is avoided, system resonance is avoided, large electromagnetic noise is caused, and the performance of the motor and the compressor is improved.

Description

Technical Field

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

[0002] As people's pursuit of environmental comfort continues to increase, higher and higher requirements are placed on the noise level of motors and electrical appliances. However, in order to achieve rapid cooling, the compressor must run at a higher speed and high frequency. The motor, as the driving component of the compressor, is accompanied by a large vibration noise, which has a great impact on the quality of the variable frequency air conditioner. For the motor vibration noise in the compressor, it is mainly electromagnetic noise. Electromagnetic noise is closely related to the electromagnetic excitation force, the stator and the compressor mode. Especially when the electromagnetic excitation force and the compressor frequency are close, it will cause system resonance and cause large electromagnetic noise.

[0003] Therefore, improving the natural frequency of the motor and its compressor and avoiding high-frequency electromagnetic excitation forces are issues that need to be focused on during the motor design process. Summary of the invention

[0004] The main purpose of the present invention is to provide a stator core, aiming to increase the natural frequency of a motor and a compressor thereof.

[0005] To achieve the above-mentioned purpose, the stator core proposed in the present invention includes a plurality of stacked stator punching sheets, each of which is provided with Q stator slots and N contact protrusions protruding outward from the outer peripheral surface of the stator punching sheet, the N contact protrusions are arranged at intervals along the circumferential direction of the stator punching sheet, and the relationship between Q and N is X=Q / N, where X is an integer.

[0006] Optionally, the N contact protrusions are evenly spaced apart.

[0007] Optionally, a plurality of stator punching sheets are stacked in sequence along the axial direction of the stator core.

[0008] Optionally, the rotation angle of the two contact protrusions of two adjacent stator punching sheets that are rotated and overlapped is n*360 / Q, where n is an integer.

[0009] Optionally, in the axial direction, the rotation angles of the two contact protrusions of two adjacent stator punching sheets that are rotated and overlapped are gradually increased.

[0010] Optionally, the stator core includes a plurality of stacked segments stacked along the axial direction of the stator core, and each of the stacked segments includes a plurality of the stator punching sheets.

[0011] Optionally, the rotation angle of the rotational overlap of the two contact protrusions adjacent to each other in two adjacent stacking sections is n*360 / Q, where n is an integer.

[0012] Optionally, in the axial direction, the rotation angles of the two contact protrusions that are close to each other in two adjacent stacking sections are gradually increased.

[0013] Optionally, a plurality of marking grooves are provided on the outer peripheral surface of the stator punching sheet located between two adjacent contact protrusions.

[0014] Optionally, in the axial direction, the angles between the contact protrusions and the marking grooves of two adjacent stator punching sheets are arranged to increase uniformly.

[0015] Optionally, in the axial direction, the increasing angle between the contact protrusions and the marking grooves of two adjacent stator punching sheets is 360 / Q.

[0016] Optionally, a plurality of oil return grooves are provided on the outer peripheral surface of the stator punching sheet located between two adjacent contact protrusions.

[0017] Optionally, in the axial direction, the angles between the contact protrusions of two adjacent stator punching sheets and the oil return groove are uniformly and gradually increased.

[0018] Optionally, in the axial direction, an increasing angle between the contact protrusions of two adjacent stator punching sheets and the oil return groove is 360 / Q.

[0019] Optionally, the number of stator slots Q is ≥12.

[0020] The present invention also provides a motor, comprising the above-mentioned stator core.

[0021] The present invention also provides a compressor, comprising the above-mentioned motor.

[0022] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0023] The above stator core has at least the following beneficial effects:

[0024] The technical solution of the present invention adopts a plurality of stacked stator punching sheets, each of which is provided with Q stator slots and N contact convex portions protruding outward from the outer peripheral surface of the stator punching sheet, and the N contact convex portions are arranged at intervals along the circumferential direction of the stator punching sheet, and the relationship between Q and N is X=Q / N, where X is an integer. Specifically, the stator slot refers to the air slot formed between two adjacent stator teeth, and its function is to place the motor winding. In this solution, the ratio of the number of stator slots to the number of contact convex portions is limited to X, and N contact convex portions are arranged on the outer peripheral surface of the stator punching sheet, and the N contact convex portions are arranged at intervals along the circumferential direction of the stator punching sheet, so that the overall stiffness of the stator housing and the stator core after shrink-fit assembly can be improved, the natural frequency of the stator can be improved, and the resonance caused by the natural frequency of the motor and compressor being close to the frequency of the electromagnetic excitation force can be avoided, thereby avoiding system resonance and causing large electromagnetic noise, thereby improving the performance of the motor and compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0026] Figure 1 It is a structural schematic diagram of a first embodiment of a stator core of the present invention;

[0027] Figure 2 for Figure 1 A partial enlarged view of the stator core at point A;

[0028] Figure 3 It is a structural schematic diagram of a second embodiment of a stator core of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a first embodiment of a stator punching sheet of a stator core of the present invention;

[0030] Figure 5 It is a structural schematic diagram of a second embodiment of a stator punching sheet of a stator core of the present invention;

[0031] Figure 6 It is a structural schematic diagram of a third embodiment of a stator punching sheet of a stator core of the present invention;

[0032] Figure 7 It is a structural schematic diagram of a fourth embodiment of a stator punching sheet of a stator core of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a fifth embodiment of a stator punching sheet of a stator core of the present invention;

[0034] Fig. 9 The figure is a comparison chart of the natural frequency test of the stator using the stator core of the present invention and the natural frequency test of the stator of the prior art.

[0035] Description of Figure Numbers:

[0036] Label name Label name 100 Stator punching 400 Marker slot 200 Stator slot 500 Oil return tank 300 contact convex part 600 Layer segment

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0042] The invention provides a stator core.

[0043] Reference Figure 4 , Figure 5 and Fig. 9 In one embodiment of the present invention, the stator core includes a plurality of stacked stator sheets 100, each of which is provided with Q stator slots 200 and N contact protrusions 300 protruding outward from the outer peripheral surface of the stator sheet 100, and the N contact protrusions 300 are arranged at intervals along the circumferential direction of the stator sheet 100, and the relationship between Q and N is X=Q / N, where X is an integer.

[0044] Specifically, the stator slot 200 refers to an air slot formed between two adjacent stator teeth, and its function is to place the motor winding. Fig. 9 From the comparison chart of the natural frequency of the stator using the stator core of the present invention and the natural frequency of the stator of the prior art, it can be seen that in this solution, the ratio of the number of stator slots 200 to the number of contact protrusions 300 is limited to be equal to X, and the N contact protrusions 300 arranged on the outer peripheral surface of the stator punching sheet 100 are arranged at intervals along the circumferential direction of the stator punching sheet 100. This can not only improve the overall stiffness of the stator casing and the stator core after shrink-fit assembly, but also improve the natural frequency of the stator, avoid the resonance caused by the natural frequency of the motor and compressor being close to the frequency of the electromagnetic excitation force, thereby avoiding system resonance and causing large electromagnetic noise, thereby improving the performance of the motor and compressor.

[0045] It should be noted that the contact protrusion 300 is arranged on the outer peripheral surface of the stator punching sheet 100 and contacts the compressor housing. This can improve the overall stiffness of the compressor housing and the stator core after assembly, and the matching area is moderate, which can make the motor have higher efficiency. At the same time, there is a reliable holding force between the stator in the compressor and the compressor housing, thereby reducing the vibration of the compressor.

[0046] Preferably, the N contact protrusions 300 are evenly spaced, so that the stator core can be in contact with the stator casing in all directions, thereby improving the overall stiffness of the stator casing and the stator core after shrink-fitting, and improving the natural frequency of the stator.

[0047] Specifically, the stator punching sheet 100 includes an annular stator yoke and a plurality of stator teeth uniformly distributed along the circumference of the annular stator yoke, and the contact protrusion 300 is provided on the outer annular surface of the annular stator yoke, wherein the stator teeth are connected to the inner side of the annular stator yoke along the radial direction of the annular stator yoke. Of course, the stator teeth can also be connected to the outer side of the annular stator yoke along the radial direction of the annular stator yoke. Each stator tooth includes a first tooth shoe portion and a second tooth shoe portion, wherein the first tooth shoe portion and the second tooth shoe portion both extend along the circumference of the annular stator yoke, the first tooth shoe portion is located on the first side of the center line of the stator tooth, and the second tooth shoe portion is located on the second side of the center line.

[0048] The contact protrusions 300 are provided on the outer annular surface of the annular stator yoke and correspond to the stator teeth.

[0049] It should be noted that the first tooth shoe of one of the two adjacent stator teeth is not in contact with the second tooth shoe of the other stator tooth, and the stator slot 200 formed between them has a notch, which is also opened facing the rotor opening. Further, that is, the gap between the adjacent first tooth shoe and the second tooth shoe. If the notch of the stator slot 200 is too small, it may cause difficulties in winding the winding. At the same time, the four corners of the stator slot 200 are arranged in an arc shape. Such an arrangement can ensure the mechanical strength of one end where the stator tooth and the stator yoke are connected, and at the same time, it can also improve the slot area utilization rate of the stator slot 200. Furthermore, the bottom of the stator slot 200 is arranged in an arc shape, and the arc coincides with the inner circumference of the stator yoke. Such an arrangement is beneficial to the distribution of magnetic force when the motor is running.

[0050] Furthermore, the first tooth shoe and the second tooth shoe are symmetrically arranged about the center line of the stator tooth, which can facilitate processing. The purpose of using the stator teeth with a symmetrical structure is twofold, namely (1) meeting the requirements of bidirectional rotation of the motor; and (2) avoiding the introduction of excessive magnetic field harmonics. Of course, it is not limited to a symmetrical arrangement.

[0051] In this embodiment, the stator punching sheet 100 is an integrated structure, and the integrated structure can increase the structural strength of the stator punching sheet. In another embodiment, the stator punching sheet 100 is a block structure. The block structure is to divide the stator punching sheet 100 into a plurality of small structures, which are processed separately and then assembled. In one embodiment, each small structure includes a stator tooth and a part of the stator yoke, and each stator tooth can be processed separately and then assembled together. These two structures have their own advantages and can be selected according to actual needs.

[0052] Furthermore, the thickness of the motor stator core punching sheets is the same, and the magnetic conductive materials used are the same material, such as silicon steel sheets, neodymium iron boron or ferrite or other permanent magnetic materials.

[0053] Furthermore, in one embodiment, the stator punching sheet 100 uses a silicon steel plate with a thickness of less than 0.35 mm. The silicon steel plate has low iron loss, high stacking coefficient, good magnetic induction intensity and good punching property, thereby ensuring that the stator punching sheet 100 has good working performance; further, the silicon steel plate is selected to have a thickness of 0.35 mm. On the one hand, it ensures that the rotor and the stator cooperate with each other to generate sufficient induced current for user use; on the other hand, it avoids the occurrence of large eddy current damage due to the stator punching sheet 100 being too thick, so as to extend the service life of the motor, and by limiting the thickness of the silicon steel plate, on the premise of meeting its functional requirements, it avoids unnecessary product materials, reduces production costs, reduces product weight, and improves user experience.

[0054] Optionally, in one embodiment, the stator teeth are made of oriented electrical steel material and the stator yoke is made of non-oriented electrical steel material. Since the cost of non-oriented electrical steel material is lower and the iron loss of oriented electrical steel material is smaller and the magnetic induction is better, this can avoid the need to replace all of the stator punching sheets 100 with oriented electrical steel material when replacing them. Only the stator teeth need to be replaced with oriented electrical steel material, which is beneficial to reducing costs. On the other hand, the excellent magnetic directivity of the oriented electrical steel material can be used to improve the tooth magnetic permeability of the stator core and reduce the tooth iron loss, thereby improving the efficiency of the motor.

[0055] Furthermore, the tooth top of the stator tooth includes an arc portion that bends inwardly, and “inwardly” in this solution refers to the direction toward the center of the stator punching sheet 100 .

[0056] Preferably, the radii of the arc portions of the plurality of stator teeth are equal and are concentric with the center of the stator punching sheet 100. Thus, when the stator is injection molded, the outer diameter of the inner mold can be set to be consistent with the radius of the arc portion, so that the inner mold can be positioned at the arc portion for injection molding.

[0057] Reference Figures 1 to 3 Optionally, in one embodiment, a plurality of stator punching sheets 100 are stacked in sequence along the axial direction of the stator core; this can improve the overall stiffness of the motor.

[0058] Furthermore, in one embodiment, the rotation angle of the two adjacent contact protrusions 300 of two adjacent stator punching sheets 100 is n*360 / Q, where n is an integer, such as n=1, 2, 3. [X]; it can be understood that by rotating and laminating, the stator core can be assembled and contacted with the housing in all directions of the circumference, thereby improving the overall stiffness of the motor and the natural frequency of the stator, avoiding the resonance caused by the natural frequency of the motor and the compressor being close to the frequency of the electromagnetic excitation force, thereby avoiding the resonance of the system and causing large electromagnetic noise, thereby improving the performance of the motor and the compressor. Of course, the present invention is not limited to this. In other embodiments, the contact protrusions 300 of multiple stator punching sheets 100 can also be located on the same straight line.

[0059] It should be noted that the rotation angle of rotational stacking of two adjacent contact protrusions 300 of two adjacent stator punching sheets 100 refers to the rotation angle of rotational stacking of two most adjacent contact protrusions 300 of two stator punching sheets 100 stacked up and down.

[0060] Optionally, in the axial direction, the rotation angles of the two adjacent contact protrusions 300 of two adjacent stator punching sheets 100 are rotated and stacked to gradually increase, so that the orderliness of the arrangement of the contact protrusions 300 on the outer peripheral surface of the stator core can be increased.

[0061] In the second embodiment, the stator core includes a plurality of stacked segments 600 stacked along the axial direction of the stator core, and each stacked segment 600 includes a plurality of stator punching sheets 100; this can improve the overall rigidity of the motor.

[0062] In the second embodiment, the rotation angle of the rotational stacking of the two adjacent contact protrusions 300 of the two adjacent stacking sections 600 is n*360 / Q; n is an integer, for example n=1, 2, 3﹒ ﹒ [X]; it can be understood that the stator core is assembled in contact with the casing in all directions of the circumference through rotational stacking, thereby improving the overall stiffness of the motor and the natural frequency of the stator, avoiding resonance caused by the natural frequencies of the motor and compressor being close to the frequency of the electromagnetic excitation force, thereby avoiding system resonance and causing large electromagnetic noise, thereby improving the performance of the motor and compressor.

[0063] Furthermore, in the axial direction, the rotation angle of the two contact protrusions 300 adjacent to each other in the two adjacent stacking sections 600 is gradually increased, so that the orderliness of the arrangement of the contact protrusions 300 on the outer peripheral surface of the stator core can be increased.

[0064] Optionally, in one embodiment, the outer peripheral surface of the stator punching sheet 100 between two adjacent contact protrusions 300 is provided with a plurality of marking grooves 400, and the marking grooves 400 are used to distinguish the front and back sides of the stator punching sheet 100, thereby avoiding the influence of different burrs on the front and back sides of the stator punching sheet 100 on the fitting of the stator punching sheet 100.

[0065] Furthermore, in the axial direction, the angles between the contact protrusions 300 of two adjacent stator punching sheets 100 and the marking grooves 400 are uniformly and gradually increased, so that the positions of the marking grooves 400 can be ensured to remain unchanged during the stacking of the stator punching sheets 100 .

[0066] Specifically, in the axial direction, the increasing angle between the contact protrusion 300 and the marking groove 400 of two adjacent stator punching sheets 100 is 360 / Q.

[0067] Optionally, in one embodiment, a plurality of oil return grooves 500 are provided on the outer peripheral surface of the stator punching sheet 100 between two adjacent contact protrusions 300; the lubricating oil can also more easily fall back to the oil pool at the bottom of the compressor, and the compressor has high reliability.

[0068] Furthermore, in the axial direction, the angles between the contact protrusions 300 of two adjacent stator punching sheets 100 and the oil return grooves 500 are uniformly and gradually increased, so that the positions of the oil return grooves 500 can be ensured to remain unchanged during the stacking of the stator punching sheets 100 .

[0069] Optionally, in the axial direction, the increasing angle between the contact protrusion 300 of two adjacent stator punching sheets 100 and the oil return groove 400 is 360 / Q.

[0070] Furthermore, in one embodiment, each marking groove 400 or oil return groove 500 is disposed corresponding to a stator groove 200 .

[0071] Reference Figure 5 As shown, Figure 5 The figure shows a schematic diagram of the structure of the first embodiment of the stator punching sheet 100. The outer peripheral surface of the stator punching sheet is provided with three contact protrusions 300. The rotation angle between two adjacent release protrusions is 120 degrees. An oil return groove 500 and three marking grooves 400 are provided between the two contact protrusions 300. The clockwise arrangement order of the oil return groove 500 and the three marking grooves 400 is oil return groove 500, marking groove 400, marking groove 400, and marking groove 400, and each marking groove 400 or oil return groove 500 is provided corresponding to a stator slot 200.

[0072] Reference Figure 6 As shown, Figure 6The figure shows a schematic diagram of the structure of the second embodiment of the stator punching sheet 100, wherein three contact protrusions 300 are provided on the outer peripheral surface of the stator punching sheet, and the rotation angle between two adjacent release protrusions is 120 degrees. An oil return groove 500 and three marking grooves 400 are provided between the two contact protrusions 300, and the clockwise arrangement order of one oil return groove and three marking grooves 400 is marking groove 400, marking groove 400, marking groove 400, and oil return groove 500; and each marking groove 400 or oil return groove 500 is provided corresponding to a stator slot 200.

[0073] Reference Figure 7 As shown, Figure 7 The figure shows a schematic diagram of the structure of the third embodiment of the stator punching sheet 100. Three contact protrusions 300 are provided on the outer peripheral surface of the stator punching sheet. The rotation angle between two adjacent release protrusions is 120 degrees. An oil return groove 500 and three marking grooves 400 are provided between the two contact protrusions 300. The clockwise arrangement order of one oil return groove and three marking grooves 400 is marking groove 400, marking groove 400, oil return groove 500, and marking groove 400; and each marking groove 400 or oil return groove 500 is provided corresponding to a stator slot 200.

[0074] Further, refer to Figure 8 As shown, Figure 8 The figure shows a schematic diagram of the structure of the fourth embodiment of the stator punching sheet 100, wherein three contact protrusions 300 are provided on the outer peripheral surface of the stator punching sheet, and the rotation angle between two adjacent release protrusions is 120 degrees. An oil return groove 500 and three marking grooves 400 are provided between the two contact protrusions 300, and the clockwise arrangement order of one oil return groove and the three marking grooves 400 is marking groove 400, oil return groove 500, marking groove 400, and marking groove 400; and each marking groove 400 or oil return groove 500 is provided corresponding to a stator slot 200.

[0075] In this way, the four types of stator punching sheets are stacked in sequence, so that the positions of the oil return groove 500 and the marking groove 400 remain unchanged.

[0076] Optionally, in one embodiment, the cross section of the marking groove 400 is arranged in an arc shape. Of course, the present invention is not limited thereto, and in some other embodiments, the cross section of the marking groove 400 may also be arranged in a trapezoidal shape.

[0077] Optionally, in one embodiment, the cross section of the oil return groove 500 may also be arranged in a square shape. Of course, the present invention is not limited thereto, and in some other embodiments, the cross section of the marking groove 400 may also be arranged in a trapezoidal shape.

[0078] Optionally, in one embodiment, the number of slots Q of the stator slots 200 is ≥12, which can improve the natural frequency of the stator component; and by reasonably setting the number of stator slots 200 gaps, it is helpful to reduce the number of turns of the winding in each stator slot 200 gap, thereby reducing the demagnetization reverse magnetic field intensity generated by the motor being energized, and increasing the motor's anti-demagnetization ability.

[0079] Furthermore, the stator slot 200 is an axisymmetric structure, and the symmetry axis of the stator slot 200 extends along the radial direction of the stator yoke.

[0080] In this technical solution, the stator slot 200 is an axisymmetric structure, thereby making the entire stator punching sheet 100 more symmetrical, and the stator teeth on both sides of the stator slot 200 can receive the same beneficial influence.

[0081] The present invention also proposes a motor, which includes a stator core. The specific structure of the stator core refers to the above embodiments. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0082] The present invention also proposes a compressor, which includes a motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0083] The present invention also proposes a refrigeration device, which includes a compressor. The specific structure of the compressor refers to the above embodiment. Since the refrigeration device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0084] The above descriptions are only optional embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A stator core, characterized in that: The stator core includes a plurality of stacked stator punching sheets, each of which is provided with Q stator slots and N contact protrusions protruding outward from the outer peripheral surface of the stator punching sheet, the N contact protrusions are arranged at intervals along the circumferential direction of the stator punching sheet, and the relationship between Q and N is X=Q / N, where X is an integer.

2. The stator core according to claim 1, characterized in that: The N contact protrusions are evenly spaced.

3. The stator core according to claim 1, characterized in that: The plurality of stator punching sheets are stacked in sequence along the axial direction of the stator core.

4. The stator core according to claim 3, characterized in that: The rotation angle of the two contact protrusions of two adjacent stator punching sheets that are rotated and overlapped is n*360 / Q, where n is an integer.

5. The stator core according to claim 4, characterized in that: In the axial direction, the rotation angles of the two contact protrusions of two adjacent stator punching sheets that are rotated and overlapped are gradually increased.

6. The stator core according to claim 1, characterized in that: The stator core includes a plurality of stacked sections stacked along an axial direction of the stator core, and each of the stacked sections includes a plurality of stator punching sheets.

7. The stator core according to claim 6, characterized in that: The rotation angle of the two contact protrusions adjacent to each other in two adjacent stacking sections is n*360 / Q, where n is an integer.

8. The stator core according to claim 7, characterized in that: In the axial direction, the rotation angle of the two contact protrusions that are close to each other in two adjacent stacking sections is gradually increased.

9. The stator core according to claim 1, characterized in that: The outer peripheral surface of the stator punching sheet located between two adjacent contact protrusions is provided with a plurality of marking grooves.

10. The stator core according to claim 9, characterized in that: In the axial direction, the angles between the contact protrusions and the marking grooves of two adjacent stator punching sheets are uniformly increased.

11. The stator core according to claim 10, characterized in that: In the axial direction, the increasing angle between the contact protrusions and the marking grooves of two adjacent stator punching sheets is 360 / Q.

12. The stator core according to claim 1, characterized in that: The outer peripheral surface of the stator punching sheet located between two adjacent contact convex parts is provided with a plurality of oil return grooves.

13. The stator core according to claim 12, characterized in that: In the axial direction, the angles between the contact protrusions of two adjacent stator punching sheets and the oil return grooves are uniformly and gradually increased.

14. The stator core according to claim 13, characterized in that: In the axial direction, the increasing angle between the contact protrusions of two adjacent stator punching sheets and the oil return groove is 360 / Q.

15. The stator core according to any one of claims 1 to 14, characterized in that: The number of stator slots Q is ≥12.

16. A motor, characterized in that: Comprising the stator core according to any one of claims 1 to 15.

17. A compressor, characterized in that: Comprising the motor as claimed in claim 16.

18. A refrigeration device, characterized in that: Comprising the compressor of claim 17.

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