Stator laminations, motors, compressors and refrigeration equipment

Abstract

The utility model discloses a stator punching sheet, a motor, a compressor and a refrigeration device, and relates to the technical field of compressors, wherein the stator punching sheet comprises a stator yoke and a stator tooth, the stator tooth is arranged on the inner side of the stator yoke, and a plurality of the stator teeth are arranged at intervals along the circumferential direction of the stator yoke, two adjacent stator teeth and the stator yoke form a stator slot, the wall surface of the stator yoke located in the stator slot is a yoke wall, the yoke wall comprises a first yoke wall, a second yoke wall and a third yoke wall distributed along the circumferential direction and connected in sequence, the first yoke wall and the third yoke wall are arranged in a straight line, the angle between the first yoke wall and the central axis of the stator slot is α1, the angle between the third yoke wall and the central axis of the stator slot is α2, 50°≤α1≤90°, 50°≤α2≤90°; the technical solution provided by the utility model improves the slot filling rate of the stator, improves the working efficiency of the motor, and reduces the processing cost of the stator punching sheet.

Description

Technical Field

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

[0002] Permanent magnet motors are used as the excitation source of variable frequency compressors due to their high efficiency and high power density. In recent years, with the release of the new national first-level energy efficiency standards and the requirements for energy conservation and emission reduction, the energy efficiency requirements for compressors have become increasingly higher, and the efficiency requirements for permanent magnet motors as the excitation source of compressors have also increased accordingly. Increasing the amount of copper wire and improving the stator slot full rate is a way to improve the efficiency of permanent magnet motors. Conventional methods to improve the stator slot full rate are to use straight bar stators, tooth yoke separation, and block stators, which greatly increase the difficulty of stator manufacturing, thereby increasing the stator processing cost. Utility Model Content

[0003] The main purpose of the utility model is to provide a stator punching sheet, a motor, a compressor and a refrigeration device, aiming to improve the slot filling rate of the stator, improve the working efficiency of the motor and reduce the processing cost of the stator punching sheet.

[0004] In order to achieve the above-mentioned purpose, the stator punching sheet proposed by the utility model comprises:

[0005] stator yoke; and

[0006] Stator teeth, the stator teeth are arranged on the inner side of the stator yoke, and a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke, two adjacent stator teeth and the stator yoke form a stator slot, the wall surface of the stator yoke located in the stator slot is a yoke wall, the yoke wall includes a first yoke wall, a second yoke wall and a third yoke wall distributed along the circumferential direction and connected in sequence, the first yoke wall and the third yoke wall are arranged in a straight line, the angle between the first yoke wall and the center axis of the stator slot is α1, the angle between the third yoke wall and the center axis of the stator slot is α2, 50°≤α1≤90°, 50°≤α2≤90°.

[0007] In one embodiment, α1 and α2 are of the same size.

[0008] In one embodiment, the length of the first yoke wall is L1, and the length of the third yoke wall is L3, wherein L1 and L3 are of the same size.

[0009] In one embodiment, a distance between end points of the first yoke wall and the third yoke wall toward one end is L2, and L1 / L2≥0.9.

[0010] In one embodiment, L1 / L2≤1.2.

[0011] In one embodiment, the stator punching sheet further includes a stator shoe, and a stator shoe is provided on two opposite side walls of the stator slot, the two stator shoes are spaced to form a slot, and the stator shoe is arranged close to one end of the stator tooth away from the stator yoke.

[0012] In one embodiment, the second yoke wall is arranged in an arc shape that protrudes away from the stator teeth; or the second yoke wall is arranged in a straight line.

[0013] In one embodiment, the second yoke wall includes a plurality of straight line segments; or the second yoke wall includes a plurality of arc line segments; or the second yoke wall includes at least one straight line segment and at least one arc line segment.

[0014] The utility model also provides a motor, comprising:

[0015] A rotor, the rotor comprising a rotor core and a permanent magnet, the rotor core being provided with a magnet slot, the permanent magnet being located in the magnet slot;

[0016] A stator, the stator comprising a stator core, the stator core comprising the stator punching sheet as described above; and

[0017] A winding is wound around the stator.

[0018] The utility model also provides a compressor, comprising the motor as described above.

[0019] The utility model also provides a refrigeration device, comprising the compressor as described above.

[0020] The stator punching sheet in the technical solution of the utility model comprises a stator yoke and stator teeth, the stator teeth are arranged on the inner side of the stator yoke, and a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke, two adjacent stator teeth and the stator yoke form a stator slot, the wall surface of the stator yoke located in the stator slot is a yoke wall, the yoke wall comprises a first yoke wall, a second yoke wall and a third yoke wall distributed along the circumferential direction and connected in sequence, the first yoke wall and the third yoke wall are arranged in a straight line, the angle between the first yoke wall and the central axis of the stator slot is α1, the angle between the third yoke wall and the central axis of the stator slot is α2, 50°≤α1≤90°, 50°≤α2≤90°; thereby, the slot filling rate of the stator is improved, thereby increasing the amount of windings in the stator slots, and at the same time, a higher slot filling rate will also reduce the gap in the stator winding, thereby improving the output torque and power density of the motor, thereby improving the efficiency of the motor and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model 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 utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0022] Figure 1 A structural schematic diagram of an embodiment of a stator punching sheet provided by the utility model;

[0023] Figure 2 A schematic structural diagram of a stator slot in a stator punching sheet provided by the utility model in implementation mode 1;

[0024] Figure 3 A schematic structural diagram of a stator slot in a stator punching sheet provided by the utility model in a second embodiment;

[0025] Figure 4 A schematic diagram showing the variation of the stator slot fill rate in the stator punching provided by the utility model with the angle α1 and / or α2;

[0026] Figure 5 A schematic diagram showing the change of the stator slot fill rate with the angle L1 / L2 in the stator punching provided by the utility model;

[0027] Figure 6 A comparison chart of the COP of the compressor provided by the utility model at different speeds with that of the prior art;

[0028] Figure 7 This is a schematic structural diagram of an embodiment of a motor provided by the utility model.

[0029] Description of Figure Numbers:

[0030] 1. Stator punching sheet; 11. Stator yoke; 12. Stator teeth; 13. Yoke wall; 131. First yoke wall; 132. Second yoke wall; 133. Third yoke wall; 14. Stator shoe; 15. Stator slot; 2. Winding; 31. Rotor core; 311. Magnet slot; 32. Permanent magnet.

[0031] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), 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 indications will also change accordingly.

[0034] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, 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 utility model.

[0035] Reference Figures 1 to 3 The utility model provides a stator punching sheet 1, comprising:

[0036] stator yoke 11; and

[0037] Stator teeth 12, the stator teeth 12 are arranged on the inner side of the stator yoke 11, and the stator teeth 12 are arranged in a plurality of intervals along the circumferential direction of the stator yoke 11, and two adjacent stator teeth 12 and the stator yoke 11 form a stator slot 15, and the wall surface of the stator yoke 11 located in the stator slot 15 is a yoke wall 13, and the yoke wall 13 includes a first yoke wall 131, a second yoke wall 132 and a third yoke wall 133 distributed along the circumferential direction and connected in sequence, the first yoke wall 131 and the third yoke wall 133 are arranged in a straight line, the angle between the first yoke wall 131 and the central axis of the stator slot 15 is α1, the angle between the third yoke wall 133 and the central axis of the stator slot 15 is α2, 50°≤α1≤90°, 50°≤α2≤90°.

[0038] The stator punching sheet 1 in the technical solution of the utility model comprises a stator yoke 11 and a stator tooth 12, the stator tooth 12 is arranged on the inner side of the stator yoke 11, and a plurality of stator teeth 12 are arranged at intervals along the circumferential direction of the stator yoke 11, and two adjacent stator teeth 12 and the stator yoke 11 form a stator slot 15, and the wall surface of the stator yoke 11 located in the stator slot 15 is a yoke wall 13, and the yoke wall 13 comprises a first yoke wall 131, a second yoke wall 132 and a third yoke wall 133 distributed along the circumferential direction and connected in sequence, and the first yoke wall 13 1 and the third yoke wall 133 are arranged in a straight line, the angle between the first yoke wall 131 and the central axis of the stator slot 15 is α1, the angle between the third yoke wall 133 and the central axis of the stator slot 15 is α2, 50°≤α1≤90°, 50°≤α2≤90°; thereby, the slot filling rate of the stator is improved, thereby increasing the amount of windings in the stator slot 15, and at the same time, a higher slot filling rate will also reduce the gap in the stator winding, thereby improving the output torque and power density of the motor, thereby improving the efficiency of the motor and reducing energy consumption.

[0039] pass Figure 4 It can be seen that when α1<50° and / or α2<50°, the slot filling rate of the stator gradually increases with the increase of the angle; when α1>90° and / or α2>90°, the slot filling rate of the stator gradually decreases with the increase of the angle; the slot filling rate of the stator is always in the best state only when 50°≤α1≤90° and 50°≤α2≤90° are within this range. If the angle range of α1 and α2 is too small when the slot filling rate of the stator is in the best state, the first yoke wall 131 and the third yoke wall 133 will be A larger processing error will affect the slot fill rate of the stator punching sheet 1, which will lead to higher processing accuracy of the stator punching sheet 1, thereby increasing the production cost of the stator punching sheet 1; while in the technical solution of the present application, when the slot fill rate is in an optimal state, the angle range of α1 and α2 is large enough, so that even if the first yoke wall 131 and the third yoke wall 133 have a certain processing error, the slot fill rate of the stator punching sheet 1 can be in an optimal state, thereby reducing the processing difficulty of the stator punching sheet 1, and thereby reducing the processing cost of the stator punching sheet 1.

[0040] Specifically, α1 and α2 are of the same size. During the production and processing of the stator punching sheet 1, there will be certain production and processing errors, which makes it impossible for α1 and α2 to be completely equal. However, during the design, α1=α2, that is, there may be a 5% error in the size of α1 and α2. Therefore, the sizes of α1 and α2 within the error range of 5% are all within the protection scope of this application.

[0041] In one embodiment, the length of the first yoke wall 131 is L1, and the length of the third yoke wall 133 is L3, wherein L1 and L3 are of the same size. Similarly, there may be certain production and processing errors in the first yoke wall 131 and the third yoke wall 133 during the processing, so that L1 and L3 may not be completely equal, that is, there may be a 5% error in the size of L1 and L3. Therefore, the size of L1 and L3 within the error range of 5% is within the protection scope of this application.

[0042] Specifically, the end point distance between the first yoke wall 131 and the third yoke wall 133 toward one end is L2, L1 / L2≥0.9, Figure 5 It can be seen intuitively that when L1 / L2 is less than 0.9, the slot fill rate of the stator increases with the increase of the L1 / L2 ratio, until L1 / L2 is equal to 0.9, when the slot fill rate of the stator reaches the optimal state.

[0043] Furthermore, L1 / L2≤1.2; when L1 / L2>1.2, the slot fill rate of the stator decreases with the increase of the L1 / L2 ratio, and when in the range of 0.9≤L1 / L2≤1.2, the slot fill rate of the stator always remains in the optimal state; it is understandable that any product will have a certain error in the production process, but most of them do not exceed 5%. If the range of L1 / L2 is too small, the stator punching sheet 1 will be processed during the processing of the first yoke wall 131, the second yoke wall 132 and the third yoke wall 133. If the error of its production and processing is too large, the slot fill rate of the stator cannot be maintained within the optimal range; and the stator punching sheet 1 in the technical solution of the present application is in the range of 0.9 to 1.2, and its range is large enough, so the processing difficulty of the stator punching sheet 1 in the present application is relatively low, thereby reducing the production cost of the stator punching sheet 1.

[0044] Figure 6 The figure is a comparison of the compressor energy efficiency of the compressor using the stator punching sheet 1 in the technical solution of the application and the compressor using the stator structure in the conventional technical solution at different speeds, wherein the compressor energy efficiency (referred to as COP) is defined as the ratio of cooling capacity (unit: W) to input power (unit: W). The higher the COP, the higher the cooling capacity per unit input power, the stronger the cooling / heating capacity, and the higher the compression efficiency. The COP of the compressor using the stator structure of the utility model is about 3% higher than that of the compressor using the conventional stator structure under 30 / 60 / 90Hz working conditions.

[0045] In one embodiment, the stator punching sheet 1 further includes a stator shoe 14, and a stator shoe 14 is provided on each of the two opposite side walls of the stator slot 15, and the two stator shoes 14 are spaced to form a notch, and the stator shoe 14 is arranged near the end of the stator tooth 12 away from the stator yoke 11. The stator shoe 14 can play the following roles: 1. Concentrated magnetic field: The T-shaped design can more effectively concentrate the magnetic field generated by the stator winding. During the operation of the motor, the stator winding will generate a magnetic field after being energized. These magnetic fields need to be effectively guided and concentrated so as to interact with the rotor magnetic field to generate torque. The design of the T-shaped tooth can make the magnetic field more concentrated and improve the torque density and efficiency of the motor. 2. Reduce magnetic resistance: The design of the T-shaped tooth can reduce magnetic resistance compared to the linear tooth. Magnetic resistance is the resistance encountered when the magnetic field propagates in the material. Reducing magnetic resistance means that the magnetic field is easier to pass through the stator teeth 12, thereby reducing energy loss and improving the performance of the motor. 3. Improve heat dissipation performance: The design of the T-shaped tooth can also increase the contact area between the stator teeth 12 and the cooling medium, thereby improving the heat dissipation performance. During the operation of the motor, the stator winding will generate heat. If the heat cannot be dissipated in time, it will affect the performance and life of the motor. The design of the T-tooth can increase the heat dissipation area, improve the heat dissipation efficiency, and ensure that the motor maintains a stable temperature during long-term operation. 4. Enhance mechanical strength: The design of the T-tooth can also enhance the mechanical strength of the stator teeth 12. During the operation of the motor, the stator teeth 12 need to withstand various forces and vibrations from the rotor, stator windings and the external environment. The design of the T-tooth can make the stator teeth 12 more solid and reduce damage and failures caused by mechanical stress. 5. Convenient winding: The design of the T-tooth can also facilitate the winding of the stator winding. During the motor manufacturing process, the stator winding needs to be wound on the stator teeth 12 in a certain order and manner. The design of the T-tooth can make the winding easier to embed into the stator slot 15, and reduce the crossing and overlapping of the winding, thereby improving the density and efficiency of the winding. 6. It plays a role in limiting the winding, reducing the possibility of the stator winding detaching from the stator teeth 12, thereby improving the stability and service life of the motor.

[0046] Reference Figure 2In the first embodiment, the second yoke wall 132 is arranged in an arc shape that bulges away from the stator teeth 12. By arranging the second yoke wall 132 in an arc shape, the arc-shaped second yoke wall 132 can better match the shape of the stator slot 15, so that the magnetic field between the stator and the rotor acts more evenly, reducing magnetic flux leakage and magnetic resistance, thereby optimizing the magnetic field distribution of the motor and improving the performance of the motor; at the same time, since the arc-shaped second yoke wall 132 can reduce the sudden change of magnetic flux at the edge of the yoke, it can reduce electromagnetic noise and vibration, and improve the running stability and comfort of the motor. Further, the arc-shaped second yoke wall 132 can increase the heat dissipation area, so that the stator yoke 11 can dissipate heat better, reduce the temperature of the motor during operation, and improve the thermal stability of the motor; finally, the stator winding is usually wound along the shape of the stator slot 15, and the arc-shaped second yoke inner wall can better adapt to the shape of the winding, reduce the bending and twisting of the winding during the winding process, and improve the reliability and service life of the winding.

[0047] Reference Figure 3 In the second embodiment, the second yoke wall 132 is arranged in a straight line. The second yoke wall 132 in a straight line shape is easier to process and manufacture than other complex curved shapes, which can reduce production costs and improve production efficiency; at the same time, the second yoke wall 132 in a straight line shape has higher structural stability when subjected to pressure or tension, which helps to ensure that the stator yoke 11 can withstand various mechanical stresses during the operation of the motor, thereby improving the reliability and service life of the motor; further, in the design of the motor, the optimization of the magnetic field distribution is an important consideration. The second yoke wall 132 in a straight line shape helps to achieve a more uniform magnetic field distribution, thereby improving the operating efficiency and performance of the motor; during the operation of the motor, eddy currents are generated in the stator core, resulting in energy loss. The straight-line yoke inner wall can reduce the formation and diffusion of eddy currents, thereby reducing eddy current losses and improving the efficiency of the motor; finally, the straight-line yoke inner wall can provide a larger space for the arrangement of the stator winding, making the winding easier to install and fix, while also reducing the crossing and overlapping between the windings, and reducing the electromagnetic interference between the windings.

[0048] Of course, in other embodiments, the second yoke wall 132 includes a plurality of straight line segments; or the second yoke wall 132 includes a plurality of arc line segments; or the second yoke wall 132 includes at least one straight line segment and at least one arc line segment. By combining a plurality of different line segments, the stator punching sheet can be used in different scenarios, thereby improving the applicability of the stator punching sheet.

[0049] Reference Figure 7 The utility model also proposes a motor, comprising:

[0050] A rotor, the rotor comprising a rotor core 31 and a permanent magnet 32, the rotor core 31 being provided with a magnet slot 311, the permanent magnet 32 ​​being located in the magnet slot 311;

[0051] A stator, the stator comprising a stator core, the stator core comprising a plurality of stator punching sheets 1 as described above; and

[0052] The winding 2 is wound on the stator.

[0053] The stator core is formed by stacking a plurality of stator punching sheets 1 ; meanwhile, it should be noted that the winding 2 is wound on the stator teeth formed by stacking a plurality of stator punching sheets 1 , rather than being wound on the stator teeth 12 of a single stator punching sheet 1 .

[0054] The utility model also proposes a compressor, which includes the above-mentioned motor. The specific structure of the motor refers to the above-mentioned embodiment. Since the compressor in the technical solution of this application 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 repeated here one by one.

[0055] The utility model also proposes a refrigeration device, the motor includes the above-mentioned compressor, wherein the refrigeration device can be but not limited to refrigerators, freezers, air conditioners and other devices with refrigeration functions, the specific structure of the compressor refers to the above-mentioned embodiment, since the refrigeration device in the technical solution of this application 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 repeated here one by one.

[0056] 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 punching sheet, characterized in that: include: stator yoke; and Stator teeth, the stator teeth are arranged on the inner side of the stator yoke, and a plurality of stator teeth are arranged at intervals along the circumferential direction of the stator yoke, two adjacent stator teeth and the stator yoke form a stator slot, the wall surface of the stator yoke located in the stator slot is a yoke wall, the yoke wall includes a first yoke wall, a second yoke wall and a third yoke wall distributed along the circumferential direction and connected in sequence, the first yoke wall and the third yoke wall are arranged in a straight line, the angle between the first yoke wall and the center axis of the stator slot is α1, the angle between the third yoke wall and the center axis of the stator slot is α2, 50°≤α1≤90°, 50°≤α2≤90°.

2. The stator sheet according to claim 1, characterized in that: α1 and α2 are of the same size.

3. The stator sheet according to claim 1, characterized in that: The length of the first yoke wall is L1, and the length of the third yoke wall is L3, wherein L1 is consistent with L3.

4. The stator sheet according to claim 3, characterized in that: The end point distance between the first yoke wall and the third yoke wall toward one end is L2, and L1 / L2≥0.

9.

5. The stator sheet according to claim 4, characterized in that: L1 / L2≤1.

2.

6. The stator sheet according to claim 1, characterized in that: The stator punching sheet also includes a stator shoe. A stator shoe is provided on two opposite side walls of the stator slot. The two stator shoes are spaced to form a slot. The stator shoe is arranged close to one end of the stator tooth away from the stator yoke.

7. The stator sheet according to claim 1, characterized in that: The second yoke wall is arranged in an arc shape protruding in a direction away from the stator teeth; or the second yoke wall is arranged in a straight line.

8. The stator sheet according to claim 1, characterized in that: The second yoke wall comprises a plurality of straight line segments; or The second yoke wall comprises a plurality of arc segments; or The second yoke wall includes at least one straight line segment and at least one arc segment.

9. A motor, characterized in that: include: A rotor, the rotor comprising a rotor core and a permanent magnet, the rotor core being provided with a magnet slot, the permanent magnet being located in the magnet slot; A stator, the stator comprising a stator core, the stator core comprising a plurality of stator punching sheets according to any one of claims 1 to 8; and A winding is wound around the stator.

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

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

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