Stator, single-phase induction motor, compressor and refrigeration device

Abstract

The stator, the single-phase induction motor, the compressor and the refrigeration equipment according to the embodiments of the present application, the stator comprises a stator core and a winding, the stator core has stator slots, the stator slots comprise a plurality of first stator slots and a plurality of second stator slots with a smaller radial depth than the first stator slots, the number of the stator slots is 28, and the 28 stator slots are arranged in 12 groups around the stator core in the stator core; the winding comprises a main winding and an auxiliary winding, and the main winding and the auxiliary winding are wound in the stator slots. Thus, the number of the stator slots is set to 28 and arranged in 12 groups, which is more reasonable than the number of the stator slots of the traditional stator, the stator harmonic magnetic field is reduced, thereby reducing the additional loss and the harmonic leakage reactance of the stator, and effectively improving the efficiency level of the single-phase induction motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a stator, a single-phase induction motor, a compressor and a refrigeration device. BACKGROUND

[0002] In the related art, in a compressor applied to a refrigeration device such as an air conditioner, a component that plays a driving role in the compressor is a motor, and the motor usually adopts a brushless direct-current motor or an induction motor.

[0003] For a compressor using a single-phase induction motor, the single-phase induction motor usually includes a stator winding composed of a main winding and an auxiliary winding connected in series with an operating capacitor and having a coil angle of 90 degrees from the main winding, and a rotor is generally a squirrel cage cast aluminum structure. The number of stator slots of the existing single-phase induction motor is usually 20, 24, etc. The number of stator slots is designed to be relatively old and cannot improve the working efficiency of the motor. SUMMARY

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present application is to provide a stator that effectively improves the efficiency level of a single-phase induction motor by setting the number and size of first stator slots, the number of coil layers, and reasonably setting the number of coil groups, so that the motor has stronger market competitiveness.

[0005] The stator according to the first aspect of the present application includes a stator core, a winding, the stator core has a stator slot, the stator slot includes a plurality of first stator slots and a plurality of second stator slots with a smaller radial depth than the first stator slots, the number of stator slots is 28, and the 28 stator slots are arranged in the form of 12 groups around the stator core in the stator core; the winding includes a plurality of main windings and a plurality of auxiliary windings, and the main windings and the auxiliary windings are wound in the stator slots.

[0006] The stator according to the embodiment of the present application sets the number of stator slots to 28 and reasonably arranges them in the form of 12 groups. Compared with the number of stator slots of a traditional stator, the number of stator slots is more and more reasonable, the stator harmonic magnetic field is reduced, the additional loss and harmonic leakage reactance of the stator are reduced, and the efficiency level of the single-phase induction motor is effectively improved.

[0007] According to some embodiments of the present application, the number of the first stator slots is 20, and the number of the second stator slots is 8; 4 of the first stator slots form a first group of stator slots, 1 of the second stator slots form a second group of stator slots, 3 of the first stator slots form a third group of stator slots, and 2 of the second stator slots form a fourth group of stator slots; the number of the second group of stator slots and the fourth group of stator slots is four, the number of the first group of stator slots and the fourth group of stator slots is two, the first group of stator slots and the third group of stator slots are spaced apart by the second group of stator slots, and adjacent third groups of stator slots are spaced apart by the fourth group of stator slots, and are oppositely arranged.

[0008] In some embodiments, two opposite first groups of stator slots form two poles of the main winding respectively, and two opposite fourth groups of stator slots form two poles of the auxiliary winding respectively; wherein the two first groups of stator slots are symmetrically arranged relative to a first center line, the two fourth groups of stator slots are symmetrically arranged relative to a second center line, the main winding is arranged adjacent to the first center line and is sequentially wound clockwise or counterclockwise in the stator slots adjacent to the first center line, and the auxiliary winding is arranged adjacent to the second center line and is sequentially wound clockwise or counterclockwise in the stator slots adjacent to the second center line.

[0009] Further, the first center line is orthogonal to the second center line, the coils constituting the two poles of the main winding are symmetrically distributed on both sides of the first center line relative to the first center line, the coils constituting the two poles of the auxiliary winding are symmetrically distributed on both sides of the second center line relative to the second center line, the main winding and the auxiliary winding each include a plurality of layers of coils wound in the corresponding winding in the stator slots, each pole of the main winding has 5 layers of coils, and each pole of the auxiliary winding has 4 layers of coils, each layer of coils is wound in a stator slot, and the coils of the auxiliary winding and the coils of the main winding can be wound in the same stator slot.

[0010] Further, the first layer of coils to the fifth layer of coils of the main winding are sequentially distributed from the outermost side to the innermost side, and the coils of the main winding are wound in the stator slots adjacent to the first center line, and the number of turns of each layer of coils of the main winding decreases sequentially from the first layer of coils to the fifth layer of coils.

[0011] Optionally, the first layer of coils to the fourth layer of coils of the auxiliary winding are sequentially distributed from the outermost side to the innermost side, and the coils of the auxiliary winding are wound in the stator slots adjacent to the second center line, and the number of turns of each layer of coils of the auxiliary winding decreases first and then increases from the first layer of coils to the fourth layer of coils.

[0012] According to some embodiments of the present application, the winding turns of the 5-layer coils of the main winding are 66, 66, 53, 37, and 22 respectively, and the winding turns of the 4-layer coils of the auxiliary winding are 57, 71, 40, and 24 respectively.

[0013] Further, the 5-layer coils of the main winding are adjacently arranged and sequentially wound, and the 4-layer coils of the auxiliary winding are adjacently arranged and sequentially wound, and the included angle between the first layer coil of the main winding which is wound first and the first layer coil of the auxiliary winding which is wound first is 90°.

[0014] In some embodiments, the winding diameter of the main winding is 0.75 mm, and the winding diameter of the auxiliary winding is 0.725 mm.

[0015] According to some embodiments of the present application, the diameter of the slot bottom circle of the first stator slot is D1, the diameter of the slot bottom circle of the second stator slot is D2, and 0.925≤D1≤0.985.

[0016] Further, the stator further comprises a stator cutout which is oppositely arranged with the second group of stator slots or the fourth group of stator slots.

[0017] The single-phase induction motor according to the second aspect of the embodiments of the present application comprises the stator as described in the above embodiments.

[0018] The compressor according to the third aspect of the embodiments of the present application comprises the single-phase induction motor as described in the above embodiments.

[0019] The refrigeration device according to the fourth aspect of the embodiments of the present application comprises the compressor as described in the above embodiments.

[0020] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings.

[0022] Figure 1 is a schematic view of a stator according to an embodiment of the present application;

[0023] Figure 2 is a schematic view of a stator core of a stator according to an embodiment of the present application;

[0024] Figure 3 is a schematic view of the cooperation between a stator core and a stator cutout of a stator according to an embodiment of the present application;

[0025] Figure 4 is a columnar diagram of a 3rd harmonic effective factor generated from the outermost to the innermost of each layer coil of the main winding and the auxiliary winding of the stator according to an embodiment of the present application;

[0026] Figure 5 is a columnar diagram of a 5th harmonic effective factor generated from the outermost to the innermost of each layer coil of the main winding and the auxiliary winding of the stator according to an embodiment of the present application;

[0027] Figure 6 is a columnar diagram of a fundamental wave effective factor generated from the outermost to the innermost of each layer coil of the main winding and the auxiliary winding of the stator according to an embodiment of the present application.

[0028] Reference numerals:

[0029] 1 - stator; 1a - stator core; 1b - first stator slot; 1c - second stator slot; 2 - winding, 2a - main winding; 2b - auxiliary winding; S1 ~ S28: stator slot number; 2a ~ 2f: stator cutout; L1 - first center line; L2 - second center line, D1 - diameter of a slot bottom circle of the first stator slot, D2 - diameter of a slot bottom circle of the second stator slot. DETAILED DESCRIPTION

[0030] Embodiments of the present application are described in detail below with reference to the attached drawings, which show by way of example, embodiments in which like numerals indicate like elements or elements having the same or similar function throughout the several figures. The embodiments described below are exemplary only, and are not to be construed as limiting the present application.

[0031] Reference is made below to Figures 1-6 a stator 1 according to an embodiment of the present application.

[0032] As Figure 1 , Figure 2 and Figure 3 indicated, the stator 1 according to the first aspect embodiment of the present application includes: a stator core 1a having stator slots including a plurality of first stator slots 1b and a plurality of second stator slots 1c, the number of stator slots being 28, the 28 stator slots being circumferentially arranged in the stator core 1a in the form of 12 groups; and a winding 2 including a plurality of main windings 2a and a plurality of auxiliary windings 2b, the main windings 2a and the auxiliary windings 2b being wound in the stator slots.

[0033] Specifically, there are 28 stator slots, including multiple first stator slots 1b and multiple second stator slots 1c with a radial depth less than the first stator slots 1b. The main winding 2a and the auxiliary winding 2b are wound in the corresponding stator slots, so that the main winding 2a and the auxiliary winding 2b in the 12 sets of stator slots respectively constitute the two poles of the main winding 2a and the two poles of the auxiliary winding 2b, and the 12 sets of stator slots are arranged sequentially in the circumferential direction of the stator core 1a.

[0034] According to the stator 1 of the present invention, the number of stator slots is set to 28 and reasonably arranged into 12 groups. The stator 1 of this embodiment has more and more reasonable stator slots than the traditional stator, which reduces the harmonic magnetic field of stator 1, thereby reducing the additional loss and harmonic leakage reactance of stator 1, and effectively improving the efficiency level of single-phase induction motor.

[0035] According to some embodiments of the present invention, the number of first stator slots 1b is 20, and the number of second stator slots 1c is 8; 4 first stator slots 1b form a first group of stator slots, 1 second stator slot 1c forms a second group of stator slots, 3 first stator slots 1b form a third group of stator slots, and 2 second stator slots 1c form a fourth group of stator slots. The number of second and fourth group stator slots is four, and the number of first and fourth group stator slots is two. The first and third group stator slots are separated by the second group stator slots, and adjacent third group stator slots are separated by the fourth group stator slots, and they are all arranged opposite each other.

[0036] Specifically, 20 first stator slots 1b and 8 second stator slots 1c are distributed circumferentially on the stator core 1a. The stator core 1a is arranged in the following order circumferentially: first group of stator slots, second group of stator slots, third group of stator slots, fourth group of stator slots, third group of stator slots, second group of stator slots, first group of stator slots, second group of stator slots, third group of stator slots, fourth group of stator slots, third group of stator slots, and second group of stator slots. This makes the number and arrangement of the first stator slots 1b and second stator slots 1c more rational, further improving the efficiency of the single-phase induction motor.

[0037] like Figure 2 As shown, two opposing first-group stator slots form the two poles of the main winding 2a, and two opposing fourth-group stator slots form the two poles of the auxiliary winding 2b. The two first-group stator slots are symmetrically arranged with respect to the first center line L1, and the two fourth-group stator slots are symmetrically arranged with respect to the second center line L2. The main winding 2a is located adjacent to the first center line L1 and is wound clockwise or counterclockwise in the stator slot adjacent to the first center line L1. The auxiliary winding 2b is located adjacent to the second center line L2 and is wound clockwise or counterclockwise in the stator slot adjacent to the second center line L2.

[0038] That is, the main winding 2a is arranged adjacent to the first center line L1, and the plurality of main windings 2a are sequentially connected in the stator slot in clockwise or counterclockwise direction, the auxiliary winding 2b is arranged adjacent to the second center line L2, and the plurality of auxiliary windings 2b are sequentially connected in the stator slot in clockwise or counterclockwise direction. In this way, the winding of the plurality of windings 2 in the stator slot is more reasonable, the length of the end of the winding 2 can be shortened, the amount of copper wire can be reduced, and the heat loss of the winding 2 can be reduced, thereby effectively improving the efficiency.

[0039] As shown in Figure 1 and Figure 2 , the first center line L1 and the second center line L2 are orthogonal, the coils of the two poles constituting the main winding 2a are symmetrically distributed on both sides of the first center line L1 relative to the first center line L1, the coils of the two poles constituting the auxiliary winding 2b are symmetrically distributed on both sides of the second center line L2 relative to the second center line L2, the main winding 2a and the auxiliary winding 2b each include a plurality of layers of coils wound in the stator slot to form the corresponding winding 2, each pole of the main winding 2a has 5 layers of coils, each pole of the auxiliary winding 2b has 4 layers of coils, each layer of coils is wound in a stator slot, the coils of the auxiliary winding 2b and the coils of the main winding 2a can be wound in the same stator slot, and the first layer of coils to the fifth layer of coils of the main winding 2a are sequentially distributed from the outermost to the innermost.

[0040] The coils of the main winding 2a are wound in the stator slot adjacent to the first center line L1, the number of turns of each layer of coils of the main winding 2a decreases sequentially from the first layer of coils to the fifth layer of coils, the first layer of coils to the fourth layer of coils of the auxiliary winding 2b are sequentially distributed from the outermost to the innermost, and the coils of the auxiliary winding 2b are wound in the stator slot adjacent to the second center line L2, the number of turns of each layer of coils of the auxiliary winding 2b decreases first and then increases from the first layer of coils to the fourth layer of coils.

[0041] In this way, the number of layers of the winding 2 of the main winding 2a and the auxiliary winding 2b under one pole is more reasonable, the number of stator slots simultaneously inserted with the main winding 2a and the auxiliary winding 2b is less, and the utilization rate of the stator slot is more reasonable.

[0042] According to some embodiments of the present application, the number of turns of the 5 layers of coils of the main winding 2a are 66, 66, 53, 37, and 22 respectively, and the number of turns of the 4 layers of coils of the auxiliary winding 2b are 57, 71, 40, and 24 respectively.

[0043] Specifically, the first layer coils of one pole of the main winding 2a are wound 66 on the slots S1 and S14, the second layer coils of one pole of the main winding 2a are wound 66 on the slots S2 and S13, the third layer coils of one pole of the main winding 2a are wound 53 on the slots S3 and S12, the fourth layer coils of one pole of the main winding 2a are wound 37 on the slots S4 and S11, the fifth layer coils of one pole of the main winding 2a are wound 22 on the slots S5 and S10, the first layer coils of the other pole of the main winding 2a are wound 66 on the slots S15 and S28, the second layer coils of the other pole of the main winding 2a are wound 66 on the slots S16 and S27, the third layer coils of the other pole of the main winding 2a are wound 53 on the slots S17 and S26, the fourth layer coils of the other pole of the main winding 2a are wound 37 on the slots S18 and S25, and the fifth layer coils of the other pole of the main winding 2a are wound 22 on the slots S19 and S24.

[0044] The number of coils of each layer of each pole of the main winding 2a is the same, the number of windings of each layer of the main winding 2a decreases as the layer number increases, the first layer coils of the main winding 2a are wound on the slots (slots S1 and S14) that are the farthest apart among the 14 slots obtained by halving the 28 slots, the second layer coils of the main winding 2a are wound immediately next to the first layer coils, the third layer coils of the main winding 2a are wound immediately next to the second layer coils, and the fourth and fifth layer coils of the main winding 2a are also wound in order.

[0045] The first layer coils of one pole of the auxiliary winding 2b are wound 57 on the slots S7 and S22, the second layer coils of one pole of the auxiliary winding 2b are wound 71 on the slots S6 and S23, the third layer coils of one pole of the auxiliary winding 2b are wound 40 on the slots S5 and S24, the fourth layer coils of one pole of the auxiliary winding 2b are wound 24 on the slots S4 and S25, the first layer coils of the other pole of the auxiliary winding 2b are wound 57 on the slots S8 and S21, the second layer coils of the other pole of the auxiliary winding 2b are wound 71 on the slots S9 and S20, the third layer coils of the other pole of the auxiliary winding 2b are wound 40 on the slots S10 and S19, and the fourth layer coils of the other pole of the auxiliary winding 2b are wound 24 on the slots S11 and S18.

[0046] The number of windings of each layer of each pole of the auxiliary winding 2b is the same, the first layer of the auxiliary winding 2b is wound on the slots (slots S7 and S22) that are the farthest apart among the 14 slots obtained by halving the 28 slots and that are the slots wound 90 degrees of coil angle away from the slots (slots S1 and S14) on which the first layer coils of the main winding 2a are wound, the second layer coils of the auxiliary winding 2b are wound immediately next to the first layer coils, the third and fourth layers of the auxiliary winding 2b are also wound in order, and the stator slots 1b on which the main winding 2a and the auxiliary winding 2b are wound have the slots S4, S5, S10, S11, S18, S19, S24, and S25.

[0047] That is, by setting the number, size and arrangement order of the first stator slots 1b and the second stator slots 1c, the number of turns of the winding 2 of the main winding 2a and the auxiliary winding 2b under one pole is reduced as the number of layers increases, so that the end accumulation of the main winding 2a and the auxiliary winding 2b during winding can be shortened, and the end length of the winding 2 can be shortened, thereby further improving the working efficiency of the stator 1.

[0048] Further, the 5-layer coils of the main winding 2a are adjacently arranged and sequentially wound, and the 4-layer coils of the auxiliary winding 2b are adjacently arranged and sequentially wound, and the included angle between the first layer coil first wound in the main winding 2a and the first layer coil first wound in the adjacent auxiliary winding 2b is 90°.

[0049] That is, the included angle between the first layer coil of the main winding 2a and the first layer coil of the auxiliary winding 2b is 90°, and the four first stator slots 1b in which the first layer coils are wound in the two poles of the main winding 2a are adjacently arranged and oppositely arranged, and the second stator slots 1c in which the first layer coils are wound in the two poles of the auxiliary winding 2b are adjacently arranged and oppositely arranged. Therefore, the relative position of the main winding 2a and the auxiliary winding 2b is more reasonable, which can effectively improve the utilization rate of the stator slots and make the number of turns of the winding 2 in each stator slot more reasonable.

[0050] In some embodiments, the winding 2 diameter of the main winding 2a is 0.75 mm, and the winding 2 diameter of the auxiliary winding 2b is 0.725 mm.

[0051] According to some embodiments of the present application, the diameter of the slot bottom circle of the first stator slot 1b is D1, the diameter of the slot bottom circle of the second stator slot 1c is D2, and 0.925≤D1≤0.985, and the stator 1 further comprises a stator 1 cutout oppositely arranged with the second group of stator slots or the fourth group of stator slots. In this way, on the one hand, the winding 2 diameters of the main winding 2a and the auxiliary winding 2b are specifically limited, which facilitates the arrangement of the stator 1 cutout on the outer peripheral portion of the stator core 1a and the arrangement of the number of turns of each layer coil of the main winding 2a under each pole and each layer coil of the auxiliary winding 2b under each pole; on the other hand, through the six stator 1 cutouts oppositely arranged with the second group of stator slots and the fourth group of stator slots, the magnetic flux density saturation of the outer peripheral portion of the stator core 1a can be avoided.

[0052] In addition, the positions of the six stator 1 cutouts are more reasonable, which can ensure the passage of refrigerant and lubricating oil during the operation of the stator 1 to improve the working stability of the stator 1.

[0053] It should be noted that avoiding the magnetic density saturation of the stator core 1a means that the rotating magnetic field of the conventional two-pole winding motor is an oblique ellipse, and the magnetic density saturation will seriously deteriorate the magnetic field harmonics of the motor, and seriously reduce the working efficiency of the motor.

[0054] Further, the stator slots are each inserted with an insulating material, and the stator core 1a is formed by stamping an electromagnetic steel plate with a thickness of 0.1 mm-1.5 mm into a designed shape and stacking in the axial direction, and then fixed by riveting or welding. In this way, under the premise of ensuring the structural strength of the stator core 1a, the insertion of the insulating material in the stator slot can further improve the working stability of the stator 1.

[0055] According to the single-phase induction motor of the second embodiment of the present application, the stator 1 is as described in the above embodiments.

[0056] Specifically, as shown in Figs. 1-3, in the present embodiment, the 3rd harmonic effective factors generated by the layers of the main winding 2a and the auxiliary winding 2b of one pole from the outermost to the innermost are respectively: Figure 4 Figure 5 and Figure 6

[0057]

[0058]

[0059]

[0060]

[0061]

[0062] The 5th harmonic effective factors generated by the layers of the main winding 2a and the auxiliary winding 2b of one pole from the outermost to the innermost are respectively:

[0063]

[0064]

[0065]

[0066]

[0067]

[0068] The fundamental effective factors generated by the layers of the main winding 2a and the auxiliary winding 2b of one pole from the outermost to the innermost are respectively:

[0069] ​​

[0070]

[0071]

[0072]

[0073]

[0074] In summary, in the present application, by setting the stator 1 into a combination of 12 groups of size slots, the 3rd harmonic content of the main winding 2a is ≥5%, and the 5th harmonic content is ≤3%. The performance of the single-phase induction motor in the starting stage is improved, and the starting performance of 0-n / 3 (n is the synchronous speed of the single-phase induction motor, n=60xf / 1, f is the power frequency of the single-phase induction motor) is improved by reasonably setting the 3rd harmonic content and the 5th harmonic content, and the aerodynamic torque depression of n / 5 is reduced.

[0075] Further, 10%≤3rd harmonic content of the auxiliary winding 2b≤15%, which can effectively reduce the harmonic-induced stray loss of the auxiliary winding 2b and improve the working efficiency of the single-phase induction motor.

[0076] The 3rd harmonic content of the main winding 2a is:

[0077]

[0078] The 5th harmonic content of the main winding 2a is:

[0079]

[0080] The 3rd harmonic content of the auxiliary winding 2b is:

[0081]

[0082] That is, compared with the traditional motor, the number of stator slots of the single-phase induction motor of the embodiment of the present application is 28, the number, arrangement order and size of the stator slots are increased, the stator 1 harmonic magnetic field is reduced, the additional loss is reduced, the harmonic leakage reactance is reduced, and the number of layers of the winding 2 and the position of the stator 1 cutout are more reasonable, which effectively improves the efficiency level of the single-phase induction motor and makes the single-phase induction motor have stronger market competitiveness.

[0083] The compressor according to the third aspect of the embodiment of the present application comprises the single-phase induction motor in the above embodiment. According to the compressor of the present embodiment, the single-phase induction motor is used, which can effectively reduce the space occupation of the compressor, improve the compression efficiency and working performance of the compressor, and make the compressor small in size.

[0084] According to the refrigeration device of the fourth aspect of the present application, the space occupied by the compressor is smaller, the refrigeration space of the refrigeration device can be increased, and the production cost of the refrigeration device can be effectively reduced.

[0085] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0086] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0087] In the description of the present application, "a plurality of" means two or more.

[0088] In the description of the present application, "above" or "below" the first feature and the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them.

[0089] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] Although embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A stator characterized by, Comprise: A stator core having stator slots, the stator slots comprising a plurality of first stator slots and a plurality of second stator slots having a smaller radial depth than the first stator slots, the number of stator slots being 28, the 28 stator slots being arranged in 12 groups around the stator core within the stator core; and And A winding comprising a plurality of main windings and a plurality of auxiliary windings, the main windings and the auxiliary windings being wound in the stator slots; The number of first stator slots is 20, and the number of second stator slots is 8; 4 first stator slots form a first group of stator slots, 1 second stator slot forms a second group of stator slots, 3 first stator slots form a third group of stator slots, and 2 second stator slots form a fourth group of stator slots, the number of second group of stator slots and third group of stator slots is four, the number of first group of stator slots and fourth group of stator slots is two, the first group of stator slots and the third group of stator slots are spaced apart by the second group of stator slots, adjacent third group of stator slots are spaced apart by the fourth group of stator slots, and are oppositely arranged, and the first group of stator slots, the second group of stator slots, the third group of stator slots, the fourth group of stator slots, the third group of stator slots, the second group of stator slots, the first group of stator slots, the second group of stator slots, the third group of stator slots, the fourth group of stator slots, the third group of stator slots, and the second group of stator slots are sequentially distributed in the circumferential direction of the stator core; Two opposite first groups of stator slots form two poles of the main winding respectively, and two opposite fourth groups of stator slots form two poles of the auxiliary winding respectively; The two first groups of stator slots are symmetrically arranged relative to a first center line, the two fourth groups of stator slots are symmetrically arranged relative to a second center line, the main winding is arranged adjacent to the first center line and sequentially wound clockwise or counterclockwise in the stator slots adjacent to the first center line, and the auxiliary winding is arranged adjacent to the second center line and sequentially wound clockwise or counterclockwise in the stator slots adjacent to the second center line; the first center line and the second center line are orthogonal, the coils of two poles constituting the main winding are symmetrically distributed on both sides of the first center line relative to the first center line, the coils of two poles constituting the auxiliary winding are symmetrically distributed on both sides of the second center line relative to the second center line, the main winding and the auxiliary winding each include a plurality of layers of coils wound in the corresponding winding in the stator slots, each pole of the main winding has 5 layers of coils, each pole of the auxiliary winding has 4 layers of coils, each layer of coils is wound in a stator slot, and the coils of the auxiliary winding and the coils of the main winding can be wound in the same stator slot; the first layer of coils to the fifth layer of coils of the main winding are sequentially distributed from the outermost side to the innermost side, and the coils of the main winding are wound in the stator slots adjacent to the first center line, the number of turns of each layer of coils of the main winding sequentially decreases from the first layer of coils to the fifth layer of coils; the first layer of coils to the fourth layer of coils of the auxiliary winding are sequentially distributed from the outermost side to the innermost side, and the coils of the auxiliary winding are wound in the stator slots adjacent to the second center line, the number of turns of each layer of coils of the auxiliary winding first decreases and then increases from the first layer of coils to the fourth layer of coils.

2. The stator of claim 1, wherein The number of turns of the 5 layers of coils of the main winding are 66, 66, 53, 37 and 22 respectively, and the number of turns of the 4 layers of coils of the auxiliary winding are 57, 71, 40 and 24 respectively.

3. The stator of claim 1, wherein The 5 layers of coils of the main winding are arranged adjacent to each other and sequentially wound, the 4 layers of coils of the auxiliary winding are arranged adjacent to each other and sequentially wound, and the included angle between the first layer of coils of the main winding which is wound first and the first layer of coils of the auxiliary winding which is wound first is 90°.

4. A stator according to any one of claims 1-3, characterized in that The winding diameter of the main winding is 0.75 mm, and the winding diameter of the auxiliary winding is 0.725 mm.

5. The stator of claim 1, wherein The diameter of the slot bottom circle of the first stator slot is D1, the diameter of the slot bottom circle of the second stator slot is D2, and 0.925≤D1≤0.

985.

6. The stator of claim 1, wherein A stator cutout is further included and arranged opposite to the second group of stator slots or the fourth group of stator slots.

7. A single-phase induction motor characterized by The stator of any one of claims 1-6 is included.

8. A compressor characterized by, The single-phase induction motor of claim 7 is included.

9. A refrigeration appliance characterized in that, The compressor of claim 8 is included.

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