Stator assembly, motor, compressor and refrigeration equipment

Abstract

The invention discloses a stator assembly, a motor, a compressor and refrigeration equipment, and relates to the technical field of motors, the stator assembly comprises a stator core and a stator winding, the stator core is provided with Q stator slots, and the stator slots comprise a plurality of large slots and small slots; the stator winding comprises a main winding and an auxiliary winding, and the main winding is provided with a coil A with the maximum span, a coil B with the minimum span and at least one coil C; the secondary winding is provided with a coil D with the maximum span, a coil E with the minimum span and at least one coil G, and at least one of stator slots where the coil C is located is a small slot; or at least one of the stator slots where the coil G is located is a small slot; the included angle between any two adjacent small grooves is alpha, and alpha is larger than or equal to (2m pi / Q)-(pi / 36) and smaller than or equal to (2m pi / Q) + (pi / 36). Q is an even number, 16 < = Q < = 32; 1 < = m < = (Q / 4)-2. The invention is used for improving the harmonic content in the motor winding and improving the efficiency of the motor.

Description

Technical Field

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

[0002] Induction motors are widely used in household appliances, industrial equipment and office automation equipment, especially in air conditioning compressors. Stator slots are a key parameter in motor design, which directly affects the performance of the motor. There is a close connection between the number of stator slots and the position of slots of different stator areas. Reasonable setting of the position of slots of different areas can improve the harmonic content in the motor winding, thereby improving the efficiency of the motor, reducing the heating of the motor, and improving the reliability of the motor. Summary of the invention

[0003] The present invention provides a stator assembly, a motor, a compressor and a refrigeration device to improve the harmonic content in the motor winding, thereby improving the efficiency of the motor, reducing the heat generation of the motor and improving the stability of the motor.

[0004] To achieve the above object, the present invention proposes a stator assembly, comprising: A stator core, wherein the stator core has Q stator slots, and the stator slots are divided according to the size of the area, including a plurality of large slots and a plurality of small slots; A stator winding, the stator winding is wound in the stator slot, the stator winding comprises a main winding and a secondary winding which are wound concentrically, the main winding and the secondary winding each have a plurality of concentrically wound coils, the coils of the main winding include a coil A with a maximum span, a coil B with a minimum span, and at least one coil C with a span between the coils A and B, and the coils of the secondary winding include a coil D with a maximum span, a coil E with a minimum span, and at least one coil G with a span between the coils D and E; Among them, at least one of the stator slots where the coil C of the main winding is located is a small slot; or, at least one of the stator slots where the coil G of the secondary winding is located is a small slot; the angle between any two adjacent small slots is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2, and m is a coefficient.

[0005] In one embodiment, the longest line segment of the line segments formed by two points passing through the center of the stator core and located on the outer contour line is L2, the shortest line segment is L1, and the total area of ​​the stator slot is S1; 0.2≦S1 / π(L2 / 2) 2 ≦0.3; 0.24≦S1 / π(L1 / 2) 2 ≦0.34.

[0006] In one embodiment, the stator winding includes a main winding and a secondary winding, and the main winding and the secondary winding are arranged to intersect each other.

[0007] In one embodiment, a cutout is provided on the outer contour of the stator core, and the cutout is provided at a portion corresponding to the small slot.

[0008] In one embodiment, the small grooves include at least two types having different areas.

[0009] In one embodiment, the number of the small grooves is at least four.

[0010] In one embodiment, the outer diameter of the stator core is 60 mm-200 mm; and / or the inner diameter of the stator core is 30 mm-100 mm.

[0011] The present invention also provides a motor, comprising a rotor assembly and the above-mentioned stator assembly.

[0012] In one embodiment, the rotor assembly includes a rotor core and a rotor winding, and the rotor winding is a squirrel cage structure made of aluminum.

[0013] The present invention also provides a compressor, comprising the above-mentioned motor.

[0014] The present invention also provides a refrigeration device, comprising the above-mentioned compressor.

[0015] The stator assembly of the technical solution of the present invention can improve the harmonic content in the motor winding by setting the angle range of the small slots in the stator slots, thereby improving the efficiency of the motor, reducing the heat generation of the motor, and improving the reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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.

[0017] Figure 1 A schematic diagram of the winding structure of the main winding of the stator assembly of an embodiment of the motor provided by the present invention; Figure 2 A schematic diagram of the winding structure of the secondary winding of the stator assembly of an embodiment of the motor provided by the present invention; Figure 3 A schematic diagram of the cross-sectional structure of an embodiment of a motor provided by the present invention; Figure 4 A schematic cross-sectional view of another embodiment of the motor provided by the present invention; Figure 5 A schematic cross-sectional structure diagram of another embodiment of a motor provided by the present invention; Figure 6 A schematic cross-sectional structure diagram of another embodiment of the motor provided by the present invention; Figure 7 A schematic diagram of the cross-sectional structure of the total area of ​​the stator core of the motor provided by the present invention; Figure 8 A schematic diagram of the cross-sectional structure of the total area of ​​the stator slots of the motor provided by the present invention; Fig. 9 A schematic cross-sectional view of an embodiment of a motor with multiple small slots provided by the present invention.

[0018] Description of Figure Numbers: 100. stator assembly; 10. stator core; 10a. stator punching sheet; 11. stator slot; 12. stator yoke; 13. stator tooth; 14. stator shoe; 15. cutout; 111. large slot; 112. small slot; 1121. first slot; 1122. second slot; 20. stator winding; 21. main winding; 22. auxiliary winding; 200. rotor assembly. DETAILED DESCRIPTION

[0019] 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.

[0020] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0021] 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 limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy 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 this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0022] Induction motors are used in household appliances, especially in air conditioning compressors. Stator slots are a key parameter in motor design, which directly affects the performance of the motor. The number of stator slots and the position of stator slots of different areas are closely related to the heating and efficiency of the motor; the reasonable setting of the position of stator slots of different areas can improve the harmonic content in the motor winding, thereby improving the efficiency of the motor, reducing the heating of the motor, and improving the reliability of the motor.

[0023] Therefore, the present application designs a stator assembly and a motor using the stator assembly.

[0024] Please refer to Figures 1 to 5 As shown, a stator assembly 100 provided in an embodiment of the present application includes a stator core 10 and a stator winding 20. The stator core 10 includes a stator slot 11, the number of the stator slots 11 is Q, and the stator winding 20 is wound in the stator slot 11. The stator slot 11 includes a plurality of large slots 111 and a plurality of small slots 112. The stator winding 20 includes a main winding 21 and a secondary winding 22 wound concentrically, and the main winding 21 and the secondary winding 22 each have a plurality of concentrically wound coils. The coils of the main winding 21 include a coil A with the largest span, a coil B with the smallest span, and at least one coil C with a span between the coil A and the coil B. The coils of the secondary winding 22 include a coil D with the largest span, a coil E with the smallest span, and at least one coil G with a span between the coil D and the coil E. At least one of the stator slots 11 where the coil C of the main winding 21 is located is a small slot 112; or at least one of the stator slots 11 described by the coil G of the secondary winding 22 is a small slot 112. The angle between any two adjacent small slots 112 is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2.

[0025] Specifically, the stator assembly 100 of the present embodiment is adapted to the rotor assembly 200 to form an induction motor. The rotor assembly 200 is arranged inside the stator assembly 100. The stator assembly 100 includes a stator core 10 and a stator winding 20, the stator core 10 has Q stator slots 11, and the stator winding 20 is wound in the stator slots 11. The stator core 10 includes a plurality of stator punchings 10a stacked along its axial direction. The stator punchings 10a are ring-like structural members, and the stator slots 11 are arranged around the inner circumference of the stator punchings 10a. The stator punchings 10a include a stator yoke 12, stator teeth 13 and stator shoes 14, and the stator yoke 12 is arranged on the outer circumference of the stator punchings 10a. One end of the stator tooth 13 extends from the stator yoke 12 to the axis of the stator punchings 10a, and the stator teeth 13 are arranged around the axis of the stator punchings 10a. The space between two adjacent stator teeth 13 is a stator slot 11, which is used to accommodate the stator winding 20. The stator shoe 14 is arranged at the end of the stator tooth 13 to prevent the stator winding 20 wound in the stator slot 11 from falling out of the slot.

[0026] The stator slots 11 are classified according to the size of the cross-sectional area. The stator slots 11 include large slots 111 and small slots 112. The number of large slots 111 and small slots 112 are both set to multiple. The stator winding 20 includes a main winding 21 and a secondary winding 22. The main winding 21 and the secondary winding 22 are both concentrically wound in the stator slots 11. The main winding 21 has multiple coils, wherein the coil with the largest span is coil A, the coil with the smallest span is coil B, and the coil with a span between coil A and coil B is coil C. The number of coils C is at least one. Similarly, the secondary winding 22 also has multiple coils, wherein the coil with the largest span of the secondary winding 22 is coil D, the coil with the smallest span is coil E, and the coil with a span between coil D and coil E is coil G. At least one of the stator slots 11 where coil C of the main winding 21 is located is a small slot 112, or at least one of the stator slots 11 where coil G of the secondary winding 22 is located is a small slot 112. Please refer to Figure 1 A schematic diagram of the coil winding of the main winding 21 is shown in FIG. Figure 2 The schematic diagram of the coil winding of the secondary winding 22 is shown in FIG. Figure 1 and Figure 2Schematic diagram of the winding arrangement of the main winding 21 and the auxiliary winding 22 of the same stator assembly 100. For the convenience of observation, the main winding 21 and the auxiliary winding 22 of the same stator assembly 100 are respectively shown in two figures. The angle between any two adjacent small slots 112 is α, and α is in the range of (2mπ / Q)-(π / 36) and (2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2. The angle between adjacent small slots 112 is defined as the angle between the center line of one of the two adjacent small slots 112 and the center line of the other small slot 112. Among them, π is a straight angle, that is, π=180; 2π / Q is the angle between every two stator slots 11 (assuming that all stator slots 11 are evenly distributed around the axis of the stator core 10), m is the coefficient value, π / 36 is a set offset value, and the small slot 112 can be appropriately offset by a certain amount. The offset in this embodiment is ±5°. The value range of m is between 1 and (Q / 4)-2. When m is 1, the two small slots 112 are arranged adjacent to each other, and α is the minimum value at this time; the larger the value of m, the farther the interval between the two small slots 112. The maximum value of m is (Q / 4)-2, and Q / 4 is the average number of stator slots 11 within every 90°. The stator slot 11 of the present application has at least one small slot 112 in each 90°. By setting the small slot 112, the magnetic field generated by the superposition of the stator winding 20 is made more sinusoidal, thereby reducing the proportion of harmonics in the winding, improving the efficiency of the motor, and reducing the heat generation.

[0027] In some embodiments, Q is a multiple of 4, Q is 16, 20, 24, 28, 32; 1≦m≦(Q / 4)-2; the angle between two adjacent small grooves 112 is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36). Figure 3 and Figure 5 As shown in the embodiment, Q is 24, 1≦m≦4. The number of small grooves 112 is 8, and the angles between two adjacent small grooves 112 are 15°, 45° and 60°. When m is 1, α is 15°; when m is 3, α is 45°; when m is 4, α is 60°. Figure 4 In the embodiment shown, Q is 24, 1≦m≦4. The number of small grooves 112 is 8. In this embodiment, the small grooves 112 are evenly distributed, and the angle between two adjacent small grooves 112 is 45°.

[0028]

[0029] Please refer to the control experimental data in the table above, where "none" means no small slot, "m=3" means there is a small slot and m is 3, and "m=4" means there is a small slot and m is 4. The efficiency and heat generation of the induction motor with a small slot in the middle position are improved by about 0.5% compared to the motor without a small slot in the middle, and the total winding heat generation is reduced by at least 5%.

[0030] like Figure 6 In the embodiment shown, the stator winding 20 includes a main winding 21 and an auxiliary winding 22. The number of the main winding 21 and the number of the auxiliary winding 22 are both two. The two main windings 21 are arranged opposite to each other, and the two auxiliary windings 22 are arranged opposite to each other. The two main windings 21 and the two auxiliary windings 22 are intersected. The main winding 21 and the auxiliary winding 22 are both wound in the stator slot 11 in a concentric winding manner. Figure 6 The horizontal axis X is symmetrically arranged, and the two secondary windings 22 are symmetrically arranged about the vertical axis Y in the figure, and one of the main windings 21 is cross-arranged with the two secondary windings 22, and the other main winding 21 is cross-arranged with the two secondary windings 22. The main winding 21 and the secondary winding 22 are cross-arranged to reduce the proximity efficiency between the coils, weaken the circulating current between the wires, and reduce the circulating current loss, and the cross-arrangement can provide more layout options for the main winding 21 and the secondary winding 22. The main winding 21 and the secondary winding 22 can be coordinated, and then combined with the large slot 111 and the small slot 112 in the stator slot 11, so that the magnetic field generated by the stator winding 20 is designed to be more sinusoidal, so as to reduce the content of harmonics, reduce the heat generation of the motor, and improve the efficiency of the motor. It should be noted that the cross-arrangement means that there are both main windings 21 and secondary windings 22 in some stator slots 11, that is, the main winding 21 and the secondary winding 22 in the stator slot 11 are coordinated with each other to adjust the magnetic field strength. Compared with other stator slots 11 in which the main winding 21 or the auxiliary winding 22 exists separately, the coils in which the main winding 21 and the auxiliary winding 22 share the same slot have better coordination performance.

[0031] Please refer again Figure 6 As shown, the stator assembly 100 of the present application is applied to a single-phase motor, and two main windings 21 and two auxiliary windings 22 form a pair of NS pole magnetic fields, and the two main windings 21 and the two auxiliary windings are arranged crosswise. In this embodiment, the main winding 21 includes 5 coils, and the coils of the main winding 21 are B1, B2, B3, B4 and B5 in order from large to small in span. The auxiliary winding 22 includes 4 coils, which are A1, A2, A3 and A4 in order from large to small in span. The two main windings 21 are symmetrically arranged about the horizontal axis in the figure, and the two auxiliary windings 22 are symmetrically arranged about the vertical axis in the figure. Among them, A4 and B3, A3 and B4, A2 and B5 are respectively in the same stator slot 11.

[0032] In an alternative embodiment, the stator winding 20 is an aluminum coil winding. The outer contour of the stator core 10 is not a complete circle. The longest line segment formed by two points passing through the center of the stator core 10 and located on the outer contour line is L2, and the shortest line segment is L1. The total area of the stator slots 11 is S1, and 0.2 ≦ S1 / π(L2 / 2) 2 ≦ 0.3; 0.24 ≦ S1 / π(L1 / 2) 2 ≦ 0.34.

[0033] Specifically, the outer contour of the stator core 10 has multiple depressions. The lowest points of two depressions, and the line segment passing through the axis of the stator core 10 is the shortest line segment L1. The outer contour also has an arc segment. The line segment passing through the axis of the stator core 10 between two points on the arc segment is the longest line segment L2. L1 < L2. The sum of the areas of the stator slots 11 is S1 (as Figure 8 shown by the shaded area). As Figure 7 shown by the shaded part is the total area S2 of the stator punching 10a, and the stator punching 10a is used for magnetic conduction. As Figure 8 shown by the shaded part in is the total area S1 of the stator slots 11. The stator slots 11 are used for energization, and the inside is filled with aluminum coil windings. The figure is only a schematic diagram and does not show all the aluminum coil windings.

[0034] When the area of the stator slots 11 is too small, the resistance of the winding will increase, which will lead to low efficiency and large heat generation of the motor. If the area of the stator slots 11 is too large, the mechanical strength of the stator punching 10a will decrease, resulting in reduced reliability of the stator punching 10a. At the same time, the space of the stator teeth and the stator yoke is less, the magnetic resistance increases, the exciting current required to reach the rated torque increases, the efficiency of the motor is low, and the heat generation of the motor becomes large. In this embodiment, the ratio between the total area S1 of the stator slots 11 and the area of the circle with L2 as the diameter is between 0.2 and 0.3. The ratio between the total area S1 of the stator slots 11 and the area of the circle with L1 as the diameter is between 0.24 and 0.34. In this application, by controlling the total area of the stator slots 11 and controlling the total area of the stator slots 11 within the above range, it is ensured that the aluminum coil windings arranged in the stator slots 11 have sufficient area and are not too large, so as to reduce the heat generation of the motor and improve the efficiency and reliability of the motor.

[0035] In an alternative embodiment, there are at least two types of small slots 112. As Figure 3 , Figure 4 and Figure 5 shown in the embodiment, the stator slots 11 are divided into large slots 111 and one type of small slot 112. Fig. 9The stator slot 11 in the embodiment includes a large slot 111 and two types of small slots 112. The two types of small slots 112 are respectively a first slot 1121 and a second slot 1122, and the cross-sectional area of ​​the second slot 1122 is smaller than the cross-sectional area of ​​the first slot 1121. In this embodiment, the main winding 21 includes coils B1 to B5, and the secondary winding 22 includes coils A1 to A3. The second slot 1122 and the first slot 1121 in the stator slot 11 corresponding to the main winding 21 are arranged adjacent to each other in sequence, and the angle between the first slot 1121 and the second slot 1122 is 15°, and the angle between the two second slots 1122 corresponding to the secondary winding 22 is 15°, and the angle between the second slot 1122 corresponding to the secondary winding 22 and the second slot 1122 corresponding to the main winding 21 is 45°. The present application sets the angle between the two small slots 112 to the above value. After testing, the motor efficiency is improved by about 0.5%, and the total winding heat generation is reduced by 5%. In some optional embodiments, the number of small slots 112 is set to at least four to ensure that there is at least one small slot 112 for every 90° of the stator core 10, that is, each pole of the main winding 21 and the auxiliary winding 22 has at least one small slot 112, to ensure that the main winding 21 can make the magnetic field generated by the winding more sinusoidal through the cooperation of the small slots 112 and the large slots 111, so as to reduce the harmonic content, improve the efficiency of the motor, reduce the heat generation of the motor, and improve the reliability of the motor.

[0036] In an optional embodiment, the outer contour of the stator core 10 has a plurality of cutouts 15 , and the cutouts 15 are arranged corresponding to parts of the small slots 112 .

[0037] Specifically, the outer contour of the stator yoke of the stator core 10 has a plurality of cutouts 15. The stator yoke of the stator core 10 is used for magnetic flux, and the size setting of the stator slots 11 has a significant impact on the magnetic flux area of ​​the stator core 10. The stator core 10 of the present application is provided with a plurality of small slots 112 for adjusting the magnetic field. The setting of the small slots 112 enlarges the stator yoke of the stator core 10, which increases the magnetic flux area. While maintaining the original magnetic density, the width of the stator yoke opposite to the small slots 112 can be appropriately reduced. The present application provides a cutout 15 at a position corresponding to the small slots 112 on the stator core 10. The stator core 10 is fixed to the housing of the motor. A channel for the passage of refrigerant can be formed between the cutout 15 and the housing to improve the heat dissipation efficiency.

[0038] It can be understood that the cutout 15 can correspond to a part of the small slots 112, and it is not necessary for each small slot 112 to correspond to a cutout 15, as long as there is enough space for the circulation of the refrigerant. Too many cutouts 15 can also make the area of ​​the stator yoke on the stator core 10 too small, increase the magnetic density of the stator yoke, and thus reduce the efficiency of the motor. Figure 4The incision 15 in the figure is only a schematic diagram, and the incision 15 in the figure is a regular straight shape. The incision 15 can be an arc-shaped structure, or it can be an irregular shape formed by combining multiple connected straight line segments or arc segments. The specific shape of the incision 15 can be set according to actual needs and is not limited here.

[0039] In an optional embodiment, the outer diameter of the stator core 10 is 60mm-200mm, and the inner diameter of the stator core 10 is 30mm-100mm. In this embodiment, the power range of the motor is 300W-6000W, the outer diameter of the stator core 10 is set in the range of 60mm-200mm, and the inner diameter of the stator core 10 is set in the range of 30mm-100mm.

[0040] The present application also relates to a motor, which is a single-phase induction motor, comprising the above-mentioned stator assembly 100 and a rotor assembly 200 disposed inside the stator assembly 100. The motor of the present application adopts the above-mentioned stator assembly 100, which can reduce harmonic content, improve the efficiency of the motor, reduce the heat generated by the motor, and improve the reliability of the motor.

[0041] The rotor assembly 200 includes a rotor core and a rotor winding, and the motor rotor is a squirrel cage structure made of aluminum. The rotor core includes a plurality of rotor punchings stacked in one body, and the rotor punchings have a plurality of through holes. The rotor winding includes aluminum bars inserted into the through holes and end rings arranged at both ends of the aluminum bars, and the aluminum bars and the two end rings form a squirrel cage structure. The rotor winding of the squirrel cage structure has a simple structure, low cost, and good short-circuit resistance.

[0042] The present application also relates to a compressor, which includes the above-mentioned motor. The stator slot 11 of the stator assembly 100 of the compressor includes a large slot 111 and a small slot 112, and the stator winding is wound in the stator slot. The stator winding includes a main winding and a secondary winding wound concentrically. The main winding and the secondary winding each have a plurality of concentrically wound coils. The coils of the main winding include a coil A with the largest span, a coil B with the smallest span, and at least one coil C with a span between the coils A and B. The coils of the secondary winding include a coil D with the largest span, a coil D with the smallest span, and a coil C with a span between the coils A and B. The coil E of the span, at least one coil G of the span between the coil D and the coil E; at least one of the stator slots where the coil C of the main winding is located is a small slot; or, at least one of the stator slots where the coil G of the secondary winding is located is a small slot; the angle between two adjacent small slots 112 is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2. By setting the angle between the two small slots 112, the harmonics generated by the motor winding can be improved, the efficiency of the motor can be improved, and the heating of the motor can be reduced.

[0043] The present application also relates to a refrigeration device, which uses the above-mentioned compressor. The refrigeration device can be a refrigerator or an air conditioner. The stator slots 11 of the stator assembly 100 of the compressor include a large slot 111 and a small slot 112. The stator winding is wound in the stator slots. The stator winding includes a main winding and a secondary winding that are wound concentrically. The main winding and the secondary winding each have a plurality of concentrically wound coils. The coils of the main winding have a coil A with the largest span, a coil B with the smallest span, and at least one coil C with a span between coil A and coil B. The coils of the secondary winding have a coil D with the largest span, a coil B with the smallest span, and a coil C with a span between coil A and coil B. The coil E of the span, at least one coil G of the span between the coil D and the coil E; at least one of the stator slots where the coil C of the main winding is located is a small slot; or, at least one of the stator slots where the coil G of the secondary winding is located is a small slot; the angle between two adjacent small slots 112 is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2. By setting the angle between the two small slots 112, the harmonics generated by the motor winding can be improved, the efficiency of the motor can be improved, and the heating of the motor can be reduced.

[0044] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A stator assembly, characterized in that: include: A stator core, wherein the stator core has Q stator slots, and the stator slots are divided according to the size of the area, including a plurality of large slots and a plurality of small slots; A stator winding, the stator winding is wound in the stator slot, the stator winding comprises a main winding and a secondary winding which are wound concentrically, the main winding and the secondary winding each have a plurality of concentrically wound coils, the coils of the main winding include a coil A with a maximum span, a coil B with a minimum span, and at least one coil C with a span between the coils A and B, and the coils of the secondary winding include a coil D with a maximum span, a coil E with a minimum span, and at least one coil G with a span between the coils D and E; Among them, at least one of the stator slots where the coil C of the main winding is located is a small slot; or, at least one of the stator slots where the coil G of the secondary winding is located is a small slot; the angle between any two adjacent small slots is α, (2mπ / Q)-(π / 36)≦α≦(2mπ / Q)+(π / 36); Q is an even number, 16≦Q≦32; 1≦m≦(Q / 4)-2, and m is a coefficient.

2. The stator assembly according to claim 1, characterized in that The longest line segment of the line segments formed by two points passing through the center of the stator core and located on the outer contour line is L2, the shortest line segment is L1, and the total area of ​​the stator slot is S1; 0.2≦S1 / π(L2 / 2) 2 ≦0.3; 0.24≦S1 / π(L1 / 2) 2 ≦0.34。 3. The stator assembly according to claim 1, characterized in that The stator winding includes a main winding and a secondary winding, and the main winding and the secondary winding are arranged crosswise.

4. The stator assembly according to claim 1, characterized in that The outer contour of the stator core is provided with a cutout, and the small groove is arranged in a portion corresponding to the cutout.

5. The stator assembly according to claim 1, characterized in that The small grooves include at least two types having different areas.

6. The stator assembly according to claim 1, characterized in that The number of the small grooves is at least four.

7. The stator assembly according to claim 4, characterized in that The outer diameter of the stator core is 60 mm-200 mm; and / or the inner diameter of the stator core is 30 mm-100 mm.

8. A motor, characterized in that: It comprises a rotor assembly and a stator assembly as claimed in any one of claims 1 to 7.

9. The motor according to claim 8, characterized in that The rotor assembly comprises a rotor core and a rotor winding, and the rotor winding is a squirrel cage structure made of aluminum.

10. A compressor, characterized in that: Comprising a motor as claimed in claim 8 or 9.

11. A refrigeration device, characterized in that: Comprising the compressor of claim 10.

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