Stator punching sheet, motor, compressor and refrigeration equipment

Abstract

The invention discloses a stator punching sheet, a motor, a compressor and refrigeration equipment, and the stator punching sheet comprises an annular stator yoke and a plurality of stator teeth which are distributed at intervals in the circumferential direction of the annular stator yoke, so that a stator groove is formed between any two adjacent stator teeth. A plurality of grooves are formed in the side face, deviating from the stator teeth, of the stator yoke in the circumferential direction, the area of the cross section of each groove is S, the maximum width of the stator yoke is h, the outer diameter of the stator punching sheet is D1, the inner diameter of the stator punching sheet is D2, and the relation of S, h, D1 and D2 is that 2S / [h (D1-D2)] is larger than or equal to 0.07 and smaller than or equal to 0.5. According to the technical scheme, the through-flow proportion of the stator core can be improved, the energy efficiency of the motor applying the stator core and the energy efficiency of the compressor applying the motor are improved, and the oil output of the compressor is optimized.

Description

Technical Field

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

[0002] The motors of existing household air conditioner compressors mainly use variable frequency motors. The mechanical structure of the compressor requires lubricating oil to ensure normal operation and smooth circulation of the refrigerant. When the size and area of ​​the motor outer circle groove are not designed properly, the oil discharge of the compressor will increase and the refrigerant circulation will not be smooth. This will seriously affect the energy efficiency of the compressor, and the decline in lubrication capacity will directly affect the service life of the product. Summary of the invention

[0003] The main purpose of the present invention is to provide a stator punching sheet, aiming at optimizing the oil discharge amount of the compressor.

[0004] To achieve the above-mentioned purpose, the present invention proposes a stator punching sheet, which includes an annular stator yoke and a plurality of stator teeth spaced circumferentially along the annular stator yoke to form a stator slot between any two adjacent stator teeth, and a plurality of grooves are provided along the circumferential direction on the side of the stator yoke away from the stator teeth, the cross-sectional area of ​​the grooves is S, the maximum width of the stator yoke is h, the outer diameter of the stator punching sheet is D1, and the inner diameter of the stator punching sheet is D2, and the relationship among S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.5.

[0005] Optionally, the relationship between S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.23.

[0006] Optionally, the relationship between S, h, D1 and D2 is: 0.15≤2S / [h(D1-D2)]≤0.18.

[0007] Optionally, the cross-sectional area S of the groove is in the range of: 20 mm 2 ≤S≤25mm 2 .

[0008] Optionally, a connecting line connecting two adjacent grooves is arranged in a straight line and / or a curve.

[0009] Optionally, the maximum width h of the stator yoke is in the range of 5mm≤h≤6mm.

[0010] Optionally, the outer diameter D1 of the stator punching sheet is in the range of 85 mm ≤ D1 ≤ 110 mm.

[0011] Optionally, the inner diameter D2 of the stator punching sheet is in the range of 45 mm ≤ D2 ≤ 60 mm.

[0012] Optionally, the number of the stator slots is Q, and Q is ≥15.

[0013] The present invention further provides a motor, comprising a rotor punching and the above-mentioned stator punching, wherein the rotor punching is rotatably arranged on the inner side of the stator punching.

[0014] Optionally, the number of stator slots of the stator punching sheet is Q, the number of pole pairs of the rotor is P, the number of phases of the motor is m, and the relationship among Q, P and m is: Q / 2mp<1.

[0015] The present invention also provides a compressor, comprising the above-mentioned motor.

[0016] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0017] The above stator punching sheet has at least the following beneficial effects:

[0018] The technical solution of the present invention adopts an annular stator yoke and a plurality of stator teeth distributed at circumferential intervals along the annular stator yoke to form a stator slot between any two adjacent stator teeth, the side of the stator yoke away from the stator teeth is provided with a plurality of grooves along the circumferential direction, the cross-sectional area of ​​the groove is S, the maximum width of the stator yoke is h, the outer diameter of the stator punching sheet is D1, the inner diameter of the stator punching sheet is D2, and the relationship among S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.5; through reasonable design, when the value range of 2S / [h(D1-D2)] is 0.07 to 0.5, the current flow ratio of the stator core can be improved, thereby improving the energy efficiency of the motor using the stator core and the compressor using the motor, and optimizing the oil discharge of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 It is a first structural schematic diagram of the stator punching sheet of the present invention;

[0021] Figure 2 is a second structural schematic diagram of a stator punching sheet;

[0022] Figure 3 The figure is a comparison of the energy efficiency between the compressor using the stator punching sheet of the present invention and the existing compressor;

[0023] Figure 4 The figure is a comparison chart of the oil discharge amount between a compressor using the stator punching sheet of the present invention and a conventional compressor.

[0024] Description of Figure Numbers:

[0025] Label name Label name 100 Stator yoke 300 Stator slot 200 Stator teeth 400 Grooves

[0026] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings in conjunction with the embodiments. DETAILED DESCRIPTION

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] The invention provides a stator punching sheet.

[0032] Reference Figures 1 to 4 In one embodiment of the present invention, the stator sheet includes an annular stator yoke 100, and a plurality of stator teeth 200 spaced apart along the circumferential direction of the annular stator yoke 100, so as to form a stator slot 300 between any two adjacent stator teeth 200, and a plurality of grooves 400 are provided along the circumferential direction on the side of the stator yoke 100 away from the stator teeth 200, the cross-sectional area of ​​the grooves 400 is S, the maximum width of the stator yoke 100 is h, the outer diameter of the stator sheet is D1, the inner diameter of the stator sheet is D2, and the relationship among S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.5.

[0033] Different values ​​are taken for the four parameters S, h, D1, and D2. The values ​​of 2S / [h(D1-D2)] are shown in Table 1:

[0034]

[0035] When analyzing different 2S / [h(D1-D2)] values, the results of compressor energy efficiency and oil discharge are compared as shown in Table 2:

[0036]

[0037] From Table 1 and Table 2, it can be seen that, compared with the other four schemes, Scheme 1 has the smallest groove 400 area, the largest oil discharge volume, and the weakest oil return capacity, but the energy efficiency of the compressor of the motor using the stator punching is average, and the energy efficiency ranks fourth in the order of best to worst among the five schemes. Scheme 2 has the largest groove 400 area, the smallest oil discharge volume, and the best oil return capacity compared with the other four schemes, but the energy efficiency of the compression chamber using the stator punching is the lowest, and the energy efficiency ranks fifth in the order of best to worst among the five schemes. Scheme 3 adopts a wider stator yoke 100 width and a larger groove 400 area, so the compressor energy efficiency and oil return capacity of the motor using this stator core are at a good level, and the energy efficiency ranks third in the order of best to worst among the five schemes. Based on Scheme 3, Scheme 4 and Scheme 5 reduce the area of ​​groove 400, increase the outer diameter of the stator, and further reduce the width of the stator yoke 100. The energy efficiency and oil discharge of the compressor using the stator punching sheet are improved. In summary, through reasonable design, this scheme can improve the current flow ratio of the stator core when the value range of 2S / [h(D1-D2)] is between 0.07 and 0.5, thereby improving the energy efficiency of the motor using the stator core and the compressor using the motor, and optimizing the oil discharge of the compressor.

[0038] It should be noted that the width of the stator yoke 100 is the dimension of the stator yoke 100 in the radial direction of the stator punching sheet.

[0039] Furthermore, the relationship between S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.23; this can limit the value range of S, h, D1 and D2, improve the current flow ratio of the stator core, thereby improving the energy efficiency of the motor using the stator core and the compressor using the motor, and optimizing the oil discharge of the compressor.

[0040] Furthermore, the relationship between S, h, D1 and D2 is: 0.15≤2S / [h(D1-D2)]≤0.18; this can limit the value range of S, h, D1 and D2, and can further improve the current flow ratio of the stator core, thereby improving the energy efficiency of the motor using the stator core and the compressor using the motor, and optimizing the oil discharge of the compressor.

[0041] Furthermore, each stator tooth 200 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 circumferentially along the annular stator yoke 100, the first tooth shoe portion is located on the first side of the center line of the stator tooth 200, and the second tooth shoe portion is located on the second side of the center line.

[0042] Furthermore, there is no contact between the first tooth shoe of one stator tooth 200 and the second tooth shoe of the other stator tooth 200 between two adjacent stator teeth 200, that is, there is a notch in the stator slot 300 formed between two adjacent stator teeth 200, and the notch is also opened facing the rotor opening; that is, the gap between the adjacent first tooth shoe and the second tooth shoe. If the notch of the stator slot 300 is too small, it may cause difficulties in winding the winding. At the same time, the four corners of the stator slot 300 are arranged in an arc shape. Such an arrangement can ensure the mechanical strength of the end where the stator tooth 200 and the stator yoke 100 are connected, and at the same time, it can also improve the slot area utilization rate of the stator slot 300.

[0043] Furthermore, the first tooth shoe and the second tooth shoe are symmetrically arranged about the center line of the stator tooth 200, which can facilitate processing. The purpose of using the stator tooth 200 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.

[0044] Furthermore, the tooth top of the stator tooth 200 includes an inwardly curved arc portion, that is, the end of the stator tooth 200 away from the stator yoke 100 includes an inwardly curved arc portion, and "inwardly" in this solution refers to the direction toward the center of the stator punching sheet.

[0045] Preferably, the radii of the arc portions of the plurality of stator teeth 200 are equal and concentric with the center of the stator punching sheet. 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.

[0046] Furthermore, the bottom of the stator slot 300 is arranged in an arc shape, and the arc coincides with the inner circumference of the stator yoke 100. Such an arrangement is beneficial to the magnetic force distribution when the motor is running.

[0047] Furthermore, in this embodiment, the stator punching sheet is an integrated structure, and the integrated structure process is simple, which reduces the difficulty of manufacturing the stator core, thereby reducing the production cost of the motor. In addition, setting the stator punching sheet as an integrated structure can improve the mechanical properties of the stator core, thereby improving the stability of the motor during operation and the service life of the motor.

[0048] Furthermore, the stator core is formed by axially stacking a plurality of stator punching sheets, the stator punching sheets of the stator core have the same thickness, and the magnetic conductive materials used are the same material.

[0049] The stator punching sheets are made of soft magnetic materials. Soft magnetic materials can achieve a larger magnetization intensity with a smaller external magnetic field. Soft magnetic materials have low coercive force and high magnetic permeability, which is beneficial to reduce the loss of the stator core, that is, reduce the iron loss of the motor, and thus help improve the performance of the motor.

[0050] Furthermore, in one embodiment, the stator punching sheet uses silicon steel sheets with a thickness of less than 0.35 mm, which have low iron loss, high stacking coefficient, good magnetic induction intensity and good punching properties, thereby ensuring good working performance of the stator punching sheet; the silicon steel sheet can reduce eddy current loss and hysteresis loss, thereby reducing the heating of the iron core, and multiple silicon steel sheets are insulated from each other, which can reduce the flow area and further reduce the heating. Of course, the present invention is not limited to this. In some other embodiments, the stator punching sheet is made of neodymium iron boron or ferrite or other permanent magnetic materials.

[0051] Furthermore, the thickness of the silicon steel plate is selected to be 0.35mm. On the one hand, it ensures that the rotor and the stator cooperate with each other to generate sufficient induced current for users; on the other hand, it avoids the occurrence of large eddy current damage due to excessive thickness of the stator punching sheet, so as to extend the service life of the motor. By limiting the thickness of the silicon steel plate, while meeting its functional requirements, it avoids unnecessary product materials, reduces production costs, reduces product weight, and improves user experience.

[0052] Furthermore, in one embodiment, the stator teeth 200 are made of oriented electrical steel material, and the stator yoke 100 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 stator punching sheets with oriented electrical steel materials when replacing them. Only the stator teeth 200 need to be replaced with oriented electrical steel materials, which is beneficial to reducing costs. On the other hand, the excellent magnetic directivity of the oriented electrical steel material is utilized to improve the tooth magnetic permeability of the stator core and reduce the tooth iron loss, thereby improving the efficiency of the motor.

[0053] Optionally, the cross-sectional area S1 of the groove 400 is in the range of: 20 mm 2 ≤S1≤25mm 2 Referring to Table 1 and Table 2, the cross-sectional area S1 of the limiting groove 400 is 20mm 2 Up to 25mm 2 , which is conducive to further optimizing the compressor energy efficiency and the compressor oil discharge volume.

[0054] Furthermore, the groove 400 includes a first groove section and a second groove section. The first groove section serves as a groove-shaped basis and is formed by the outer wall of the stator yoke 100, that is, the side wall on the side away from the axis of the stator core, which is recessed inwardly. The second groove section continues to be recessed inwardly on the basis of the first groove section, that is, the second groove section extends from the bottom of the first groove section toward the axis of the stator core, thereby forming a setting scheme in which two layers of grooves 400 are superimposed, which can suppress noise on the one hand and ensure motor efficiency on the other.

[0055] Furthermore, since the second slot segment is formed by continuing to extend inwardly on the basis of the first slot segment, generally, the slot width of the second slot segment is not greater than the slot width of the first slot segment.

[0056] Optionally, in one embodiment, the connecting line connecting two adjacent grooves 400 is arranged in a straight line. In a second embodiment, the connecting line connecting two adjacent grooves 400 is arranged in a curve. The conventional structure is more convenient for processing and manufacturing. Of course, the present invention is not limited to this. In some other embodiments, on the same stator punching sheet, the connecting lines of some adjacent grooves 400 can also be arranged in a straight line, and the connecting lines of some adjacent grooves 400 can be arranged in a curve.

[0057] Optionally, the maximum width h of the stator yoke 100 is in the range of 5mm≤h≤6mm; on the one hand, limiting the width of the stator yoke 100 within a certain width range can reduce the thickness of the stator yoke 100, increase the slot area, reduce motor loss, improve motor efficiency, improve the energy efficiency of the compressor with the motor, maintain the motor efficiency while ensuring the stiffness of the motor stator, reduce the motor vibration noise, and then reduce the overall noise of the compressor. In this way, it can not only ensure the stiffness of the stator punching sheet, but also improve the energy efficiency of the compressor of the motor using the stator core and optimize the oil discharge of the compressor. On the other hand, by limiting the width of the stator yoke 100, the length of the stator slot 300 in the radial direction of the stator core is further limited, that is, the slot depth of the stator slot 300 is limited. By limiting the above size, that is, limiting the slot area of ​​the stator slot 300, the magnetic flux level of the entire motor is further constrained. By limiting the size of each part of the stator core and the slot area of ​​the stator slot 300, the magnetic flux level and copper-iron loss level of the entire motor are constrained, and the copper-iron loss level can be distributed within a more reasonable range, thereby achieving an overall improvement in the efficiency of the motor.

[0058] Optionally, the range of the outer diameter D1 of the stator punching sheet is 85mm≤D1≤110mm; that is, the size of the stator punching sheet is limited, and the size of the rotor core is indirectly limited, thereby preliminarily limiting the magnetic flux of the motor; and limiting the range of the outer diameter D1 of the stator punching sheet also limits the outer diameter of the motor, which will not make the motor too large and will make the motor within this size range have higher energy efficiency.

[0059] Optionally, the inner diameter D2 of the stator punching sheet is in the range of 45 mm ≤ D2 ≤ 60 mm. The inner hole diameter of the stator punching sheet is larger, the ring width is smaller, the magnetic field density of the yoke and the tooth is closer, and the magnetic field density of the stator is more uniform when the motor is running.

[0060] Furthermore, in one embodiment, when the outer diameter of the stator punching sheet does not change but the inner hole diameter increases, the area of ​​the slot is reduced, thereby reducing the amount of silicon steel sheets used and improving the utilization rate of the silicon steel sheets.

[0061] Optionally, the number of stator slots 300 is Q, Q ≥ 15; specifically, the stator slots 300 are formed between two stator teeth 200, and the number of stator slots 300 is positively correlated with the number of stator teeth 200. In this design, when the number of stator teeth 200 is different, the demagnetization ability of the motor is different, and then for different numbers of stator teeth 200, according to the demagnetization characteristics of the motor, the more teeth there are, the stronger the demagnetization ability of the motor is. Therefore, the number of stator slots 300 is limited to Q ≥ 15, thereby indirectly limiting the number of stator teeth 200, which is beneficial to enhancing the demagnetization ability.

[0062] The present invention further provides a motor, the motor comprising a rotor punching and the above-mentioned stator punching, the rotor punching being rotatably arranged inside the stator punching. The specific structure of the stator punching refers to the above-mentioned embodiment. Since the motor adopts all the technical solutions of all 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 described one by one here.

[0063] It should be noted that the rotor core is formed by stacking and stamping a plurality of rotor punching sheets.

[0064] Optionally, the rotor punching sheets are made of soft magnetic material. Soft magnetic material can achieve a larger magnetization intensity with a smaller external magnetic field. Soft magnetic material has low coercive force and high magnetic permeability, which is beneficial to reducing the loss of the rotor core, that is, reducing the iron loss of the motor, and thus helping to improve the performance of the motor.

[0065] Furthermore, in this embodiment, the rotor core is a silicon steel sheet, which can reduce eddy current loss and hysteresis loss, thereby reducing the heating of the rotor core, and the multiple silicon steel sheets are insulated from each other, which can reduce the flow area and further reduce the heating. Specifically, when the multiple rotor punchings are punched, the multiple magnet slots on each rotor punching can be connected along the axial direction of the rotor core, so that the multiple magnet slots on each rotor punching can form corresponding slots, and the multiple magnetizers are adapted to the formation of the slots, and the multiple magnetizers are inserted into the multiple slots to form magnetic poles. It can be understood that the rotor punchings can also be made of neodymium iron boron or ferrite or other materials.

[0066] Furthermore, in one embodiment, the rotor punching sheets and the stator punching sheets can be made of different materials or shapes, so as to meet the requirements of different processing technologies of the stator and the rotor, which is conducive to selecting suitable punching sheets to form the rotor core and the stator core according to the performance requirements of the motor, thereby ensuring good performance of the electrode, and also improving the wide application range of the motor. Of course, the present invention is not limited to this. In some other embodiments, the stator punching sheets stacked into the stator core and the rotor punching sheets stacked into the rotor core are made of the same material, which is conducive to the mass production of punching sheets and reduces manufacturing costs.

[0067] In which, further, the rotor core is formed by axially stacking a plurality of rotor punchings, and the material of the rotor punchings is selected to be silicon steel sheets or other soft magnetic material sheets, and the thickness is not more than 0.35 mm.

[0068] Optionally, the number of stator slots 300 of the stator sheet is Q, the number of pole pairs of the rotor is P, the number of phases of the motor is m, and the relationship among Q, P and m is: Q / 2mp<1.

[0069] Specifically, by limiting the number of stator teeth 200 to not more than twice the product of the number of rotor pole pairs and the number of motor phases, a fractional slot motor can be formed as a whole. Under the action of the fractional slot motor, the high-order harmonic potential generated by the non-sinusoidal distribution of the magnetic pole magnetic field can be effectively weakened, and the amplitude of the tooth harmonic potential can also be weakened, and the waveform can be improved. In addition, due to the use of a motor with a fractional slot shape, the pulse amplitude of the magnetic flux can also be effectively reduced, thereby reducing the pulse loss on the magnetic pole surface.

[0070] 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.

[0071] 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.

[0072] 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 punching sheet, characterized in that: The stator punching sheet includes an annular stator yoke and a plurality of stator teeth spaced circumferentially along the annular stator yoke to form a stator slot between any two adjacent stator teeth. The side of the stator yoke away from the stator teeth is provided with a plurality of grooves along the circumferential direction, the cross-sectional area of ​​the grooves is S, the maximum width of the stator yoke is h, the outer diameter of the stator punching sheet is D1, the inner diameter of the stator punching sheet is D2, and the relationship among S, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.

5.

2. The stator sheet according to claim 1, characterized in that: The relationship among S1, h, D1 and D2 is: 0.07≤2S / [h(D1-D2)]≤0.

23.

3. The stator sheet according to claim 2, characterized in that: The relationship among S1, h, D1 and D2 is: 0.15≤2S / [h(D1-D2)]≤0.

18.

4. The stator sheet according to claim 1, characterized in that: The cross-sectional area S of the groove is in the range of: 20 mm 2 ≤S≤25mm 2 .

5. The stator sheet according to claim 1, characterized in that: The connecting line connecting two adjacent grooves is arranged in a straight line and / or a curve.

6. The stator sheet according to claim 1, characterized in that: The maximum width h of the stator yoke is in the range of 5 mm ≤ h ≤ 6 mm.

7. The stator sheet according to claim 1, characterized in that: The outer diameter D1 of the stator punching sheet is in the range of 85 mm ≤ D1 ≤ 110 mm.

8. The stator sheet according to claim 1, characterized in that: The inner diameter D2 of the stator punching sheet is in the range of 45 mm ≤ D2 ≤ 60 mm.

9. The stator sheet according to any one of claims 1 to 8, characterized in that: The number of the stator slots is Q, and Q≥15.

10. A motor, characterized in that: The motor comprises a rotor punching and a stator punching as claimed in any one of claims 1 to 9, wherein the rotor punching is rotatably arranged on the inner side of the stator punching.

11. The motor according to claim 10, characterized in that The number of stator slots of the stator punching sheet is Q, the number of pole pairs of the rotor is P, the number of phases of the motor is m, and the relationship among Q, P and m is: Q / 2mp<1.

12. A compressor, characterized in that: Comprising the motor as claimed in claim 10 or 11.

13. A refrigeration device, characterized in that: Comprising the compressor of claim 12.

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