Stator punching sheet, stator core, motor and compressor

Abstract

The invention provides a stator punching sheet, a stator core, a motor and a compressor, the stator punching sheet comprises a plurality of yoke parts, the plurality of yoke parts are sequentially connected along the circumferential direction of the stator punching sheet, tooth parts are arranged on the yoke parts, a groove part is formed between every two adjacent tooth parts, and the tooth parts are arranged along the radial outward direction of the stator punching sheet. And a first through hole and a second through hole are sequentially formed in the tooth part. According to the invention, the technical problem that fin warping and welding deformation are easy to generate when the stator core is produced in the prior art can be solved.

Description

Technical Field

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

[0002] Currently, most existing air-conditioning compressor motors use permanent magnet synchronous motors. As the energy efficiency standards for compressors are improved year by year, motor optimization design and efficiency improvement have become the focus of design. Among the many efficiency improvement solutions, using silicon steel sheets with better performance to reduce motor iron loss is one of the common solutions. However, the silicon steel sheets of household air-conditioning motors are generally thin. In the actual processing process, the finished products are prone to warping and welding deformation, resulting in poor coaxiality of the stator and rotor after the motor is installed in the compressor, which ultimately affects the energy efficiency of the compressor. The gaps caused by the warping will also cause noise and vibration during the operation of the motor.

[0003] Since the stator core in the prior art has technical problems such as easy warping and welding deformation during production, the present invention studies and designs a stator punching sheet, a stator core, a motor and a compressor. Summary of the invention

[0004] Therefore, the present invention provides a stator punching sheet, a stator core, a motor and a compressor, which can solve the technical problems of easy warping and welding deformation in the production of the stator core in the prior art.

[0005] In order to solve the above problems, the present invention provides a stator punching sheet, comprising: a plurality of yokes, wherein the plurality of yokes are connected in sequence along the circumferential direction of the stator punching sheet, the yokes are provided with teeth, a groove is formed between two adjacent teeth, and a first through hole and a second through hole are sequentially provided on the teeth along the radial outward direction of the stator punching sheet.

[0006] In some embodiments, a protrusion is provided on a bottom surface of the groove portion, and the protrusion extends toward a center of the stator punching sheet.

[0007] In some embodiments, the side wall and the bottom surface of the groove are connected by a chamfer, and along the radial inward direction of the stator punching sheet, the protrusion has a top surface and a bottom surface, the top surface and the bottom surface are arc-shaped, the top surface and the bottom surface are cocentrically arranged, and the top surface and the bottom surface are connected by a connecting edge, and the connecting edge intersects with the chamfer.

[0008] In some embodiments, along the radial direction of the stator sheet, the protrusion has a width ΔD that satisfies 0.7 mm ≤ ΔD ≤ 0.9 mm.

[0009] In some embodiments, the minimum distance between the first through hole and the end of the tooth portion facing away from the yoke portion is d1, and the width of the tooth portion is d0, which satisfies 0.4≤d1 / d0≤0.55.

[0010] In some embodiments, a distance between a center of the first through hole and a center of the second through hole is d2, and a minimum distance between the first through hole and an end of the tooth portion facing away from the yoke portion is d1, which satisfies 1.5≤d2 / d1.

[0011] In some embodiments, there are pole shoes on both sides of the back of the tooth portion, and the pole shoes are located on the tooth portion near the end of the tooth portion facing away from the yoke portion. The pole shoe includes a first straight line segment, a second straight line segment and an arc segment connected in sequence, the first straight line segment is located on the side of the pole shoe facing the adjacent tooth portion, the second straight line segment is located on the side of the pole shoe facing the yoke portion, and the second straight line segment is connected to the tooth portion through the arc segment.

[0012] In some embodiments, along the radial direction of the stator sheet, the thickness of the pole shoe is d3, and the minimum distance between the end of the tooth portion close to the tooth portion facing away from the yoke portion and the arc segment is d4, which satisfies 0.75≤d4 / d3, 2mm≤d3.

[0013] In some embodiments, the arc segment includes a first segment and a second segment, the second segment is connected to the second straight segment, the second segment is connected to the tooth portion through the first segment, the radius of the first segment is R, the radius of the second segment is r, which satisfies 3≤R / r≤5.

[0014] In some embodiments, a first groove is provided on the side of the yoke facing away from the tooth portion, the center of the first groove is arranged opposite to the tooth portion, and a third groove and a plurality of second grooves are provided on the bottom wall of the first groove, the plurality of second grooves are evenly distributed on both sides of the third groove, and the second grooves on both sides of the third groove are symmetrically arranged about the center of the third groove.

[0015] In some embodiments, on either side of the third groove, a line connecting the centers of two adjacent second grooves and the center of the stator punching sheet has an angle α that satisfies 4.5°≤α≤5.5°.

[0016] In some embodiments, the bottom wall is arranged concentrically with the outer circle of the stator punching sheet, and a radius difference Δd between the bottom wall and the outer circle of the stator punching sheet satisfies: 0.6 mm ≤ Δd ≤ 0.8 mm.

[0017] The present invention also provides a stator core, comprising the above-mentioned stator punching sheet.

[0018] In some embodiments, the stator core includes a stator punching sheet in the middle and stator punching sheets at both ends, and buckle points are provided at the first through holes and the second through holes of the stator punching sheets at both ends.

[0019] The present invention also provides a motor, comprising the above-mentioned stator core.

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

[0021] The stator punching sheet, stator core, motor and compressor provided by the present invention have the following beneficial effects:

[0022] During assembly, the first through hole and the second through hole can be connected with the through holes of the punching sheets at both ends. Compared with the general stamped core, the connection strength of the teeth is significantly enhanced, and the design of the through hole and the buckle can reduce the stress on the core teeth and prevent the teeth from being deformed during the assembly process. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0024] Figure 1 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 1 ;

[0025] Figure 2 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 2 ;

[0026] Figure 3 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 3 ;

[0027] Figure 4 The structure of the stator punching sheet of the present invention is shown in FIG. Figure 4 ;

[0028] Figure 5 This is a partial enlargement of the stator punching of the present invention. Figure 1 ;

[0029] Figure 6 This is a partial enlargement of the stator punching of the present invention. Figure 2 ;

[0030] Figure 7 is a comparison chart of the vibration value of the stator punching sheet of the present invention and the compressor housing;

[0031] Figure 8 It is a comparison diagram of the stator punching sheet of the present invention and the noise of the compressor housing.

[0032] The accompanying drawings are marked as follows:

[0033] 1. Tooth portion; 2. Groove portion; 3. Yoke portion; 4. Protrusion; 5. Chamfer; 6. First through hole; 7. Second through hole; 8. Side wall; 9. Bottom wall; 10. Third groove; 11. Second groove; 12. First straight line segment; 13. Second straight line segment; 14. Arc segment. DETAILED DESCRIPTION

[0034] 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, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. 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.

[0035] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0036] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0037] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0038] See also Figure 1-8 As shown, according to an embodiment of the present invention, a stator punching sheet is provided, comprising: a plurality of yokes 3, wherein the plurality of yokes 3 are sequentially connected along the circumferential direction of the stator punching sheet, a tooth portion 1 is provided on the yoke 3, a groove portion 2 is formed between two adjacent tooth portions 1, and a first through hole 6 and a second through hole 7 are sequentially provided on the tooth portion 1 along the radial outward direction of the stator punching sheet.

[0039] In this technical solution, during assembly, the first through hole 6 and the second through hole 7 can be connected with the full through holes of the two end punching sheets. Compared with the general stamped iron core, the connection strength of the teeth is significantly enhanced, and the design of the through hole and the buckle that cooperate with each other can reduce the stress on the teeth of the core, and prevent the teeth of the stator from being deformed during the assembly process. Of course, the stator punching sheet of the present invention is not limited to the first through hole 6 and the second through hole 7, and multiple through holes can also be set. For the motor stator with thinner silicon steel sheets, the teeth are easily deformed. Therefore, the stator punching sheet of the present invention is provided with two through holes at each tooth to ensure strength, and a buckle is provided; the two end punching sheets retain the lower end buckle point and are provided with a full through hole, which is connected to the buckle of the center punching sheet in the form of mortise and tenon, which greatly reduces the stress on the stator teeth.

[0040] In some embodiments, a protrusion 4 is provided on the bottom surface of the groove 2, and the protrusion 4 extends toward the center of the stator punching sheet. The stator punching sheet of the present invention decomposes the stress on the motor tooth and yoke by optimizing the structure and connection method of the tooth yoke, and reduces the deformation of the stator tooth, effectively solving the problems of poor coaxiality, spot welding deformation, reduced energy efficiency and increased noise and vibration caused by warping and deformation during motor assembly.

[0041] In some embodiments, the side wall and the bottom surface of the groove portion 2 are connected by a chamfer 5, and along the radial inward direction of the stator punching sheet, the protrusion 4 has a top surface and a bottom surface, the top surface and the bottom surface are arc-shaped, the top surface and the bottom surface are cocentrically arranged, and the top surface and the bottom surface are connected by a connecting edge, and the connecting edge intersects with the chamfer 5.

[0042] In some embodiments, along the radial direction of the stator punching sheet, the protrusion 4 has a width ΔD, which satisfies 0.7mm≤ΔD≤0.9mm. In this technical solution, the yoke 3 extends inward near the outer circle of the slot 2 to form a step structure, the arc section at the lower end of the step structure is concentric with the arc section of the outer circle of the slot, and the step width Δd is limited, while ensuring the slot area and tooth strength, the stress on the yoke of the middle punching sheet is effectively reduced.

[0043] In some embodiments, the minimum distance between the first through hole 6 and the end of the tooth portion 1 facing away from the yoke 3 is d1, and the width of the tooth portion 1 is d0, which satisfies 0.4≤d1 / d0≤0.55. The distance between the center of the first through hole 6 and the center of the second through hole 7 is d2, and the minimum distance between the first through hole 6 and the end of the tooth portion 1 facing away from the yoke 3 is d1, which satisfies 1.5≤d2 / d1. In this technical solution, by constraining the first through hole 6 and the second through hole 7, the connection strength of the tooth portion is significantly enhanced compared with the general stamped iron core, and the design of the through hole and the buckle cooperating with each other can reduce the stress on the core tooth portion, and prevent the stator tooth portion from deforming during the assembly process.

[0044] The two sides of the back of the tooth portion 1 are provided with pole shoes, and the pole shoes are located on the tooth portion 1 near the end of the tooth portion 1 facing away from the yoke portion 3, and the pole shoes include a first straight segment 12, a second straight segment 13 and an arc segment 14 connected in sequence, the first straight segment 12 is located on the side of the pole shoe facing the adjacent tooth portion 1, the second straight segment 13 is located on the side of the pole shoe facing the yoke portion 3, and the second straight segment 13 is connected to the tooth portion 1 through the arc segment 14. In this technical solution, the core punching tooth portion 1 includes a pole shoe, and the pole shoe is smoothly connected by the first straight segment 12, the second straight segment 13 and the arc segment 14, wherein d4 is the minimum distance between this structure and the inner circle. In actual design, the structure of the pole shoe has a greater influence on the cogging torque of the motor.

[0045] In some embodiments, along the radial direction of the stator sheet, the thickness of the pole shoe is d3, the minimum distance between the end of the tooth portion 1 close to the tooth portion 1 facing away from the yoke portion 3 and the arc segment 14 is d4, which satisfies 0.75≤d4 / d3, 2mm≤d3, the arc segment 14 includes a first segment and a second segment, the second segment is connected to the second straight segment 13, the second segment is connected to the tooth portion 1 through the first segment, the radius of the first segment is R, and the radius of the second segment is r, which satisfies 3≤R / r≤5. In this technical solution, by limiting the size of d4, d3 and the two arc segments, the strength of the pole shoe can be enhanced while avoiding the change in the tooth shoe structure that causes the motor tooth magnetic line to be overly saturated, resulting in local overheating of the tooth portion, increased tooth slot torque and reduced energy efficiency.

[0046] In some embodiments, the yoke 3 is provided with a first groove on the side facing away from the tooth portion 1, the center of the first groove is arranged opposite to the tooth portion 1, the first groove bottom wall 9, the bottom wall 9 is provided with a third groove 10 and a plurality of second grooves 11, the plurality of second grooves 11 are evenly distributed on both sides of the third groove 10, and the second grooves 11 on both sides of the third groove 10 are arranged symmetrically about the center of the third groove 10. In this technical solution, the first groove has a side wall 8, and the second groove 11 is located between the third groove 10 and the side wall 8. The third groove 10 and the plurality of second grooves 11 are used to decompose the stress of the stator core 1 during assembly and optimize electromagnetic noise.

[0047] In some embodiments, on either side of the third groove 10 , a line connecting the centers of two adjacent second grooves 11 and the center of the stator punching sheet has an angle α that satisfies 4.5°≤α≤5.5°.

[0048] In some embodiments, the bottom wall 9 is arranged concentrically with the outer circle of the stator punching sheet, and a radius difference Δd between the bottom wall 9 and the outer circle of the stator punching sheet satisfies: 0.6 mm ≤ Δd ≤ 0.8 mm.

[0049] The outer circle of the stator core is provided with a first groove facing the upper end of the tooth portion 1. The first groove is smoothly connected by the side wall 8, the third groove 10 and a plurality of second grooves 11. The center of the third groove 10 is located at the intersection of the center line of the tooth portion and the bottom wall 9. At the same time, a group of second grooves 11 are opened on the bottom walls 9 on both sides at a position symmetrical to the center axis of the tooth portion. The number of second grooves 11 opened on each bottom wall 9 on both sides of the third groove 10 is optimally 2. The line between the center of two adjacent second grooves 11 and the center of the stator punching sheet has an angle α, which satisfies 4.5°≤α≤5.5°. When designed as other numbers, the upper and lower limits of the angle can be designed to be inversely proportional to the number of second grooves 11. By designing the second groove 11 and limiting the cutting edge diameter range, the stress between the core and the housing during the stator assembly process and the vibration during operation can be evenly transmitted to the cutting edges on both sides under the premise of considering the processing feasibility, which helps to reduce the deformation of the core during assembly and reduce the noise and vibration of the motor during operation.

[0050] See also Figure 7 and Figure 8 As shown in the figure, the circular groove second groove 11 shows the numerical changes of the total vibration value and the total noise value of the compressor housing at the new national standard operating point of the compressor made of a motor with second grooves 11 of different numbers and different angles. It can be seen that when the circular groove angle in the optimal embodiment is within this size constraint range, the motor noise and vibration are both optimal.

[0051] The present invention also provides a stator core, comprising the above-mentioned stator punching sheet.

[0052] The stator core of the present invention can be wound into a stator assembly and fixed to the compressor housing by shrink fitting, cold pressing or the like.

[0053] In some embodiments, the stator core includes the stator punching sheet in the middle and the stator punching sheets at the two ends, and buckle points are provided at the first through hole 6 and the second through hole 7 of the stator punching sheets at the two ends. In this technical solution, two buckles are inserted into the through hole of the middle punching sheet, and the ends of the two buckles are respectively connected to the buckle points of the punching sheets at the two ends, so that the punching sheets are connected as a whole.

[0054] The present invention also provides a motor, comprising the above-mentioned stator core.

[0055] The present invention also provides a compressor, comprising the above-mentioned motor.

[0056] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. A stator punching sheet, characterized in that: include: A plurality of yokes (3) are connected in sequence along the circumferential direction of the stator punching sheet, a tooth portion (1) is provided on the yoke portion (3), a groove portion (2) is formed between two adjacent tooth portions (1), and a first through hole (6) and a second through hole (7) are provided in sequence on the tooth portion (1) in a radially outward direction of the stator punching sheet.

2. The stator lamination according to claim 1, characterized in that: The bottom surface of the groove portion (2) is provided with a protrusion (4), and the protrusion (4) extends toward the center of the stator punching sheet.

3. The stator sheet according to claim 2, characterized in that: The side wall and the bottom surface of the groove portion (2) are connected via a chamfer (5); along the radial inward direction of the stator punching sheet, the protrusion (4) has a top surface and a bottom surface; the top surface and the bottom surface are arc-shaped; the top surface and the bottom surface are cocentrically arranged; the top surface and the bottom surface are connected via a connecting edge; the connecting edge intersects with the chamfer (5).

4. The stator sheet according to claim 2, characterized in that: Along the radial direction of the stator sheet, the protrusion (4) has a width ΔD which satisfies 0.7 mm ≤ ΔD ≤ 0.9 mm.

5. The stator sheet according to claim 1, characterized in that: The minimum distance between the first through hole (6) and the end of the tooth portion (1) facing away from the yoke portion (3) is d1, and the width of the tooth portion (1) is d0, which satisfies 0.4≤d1 / d0≤0.

55.

6. The stator lamination according to claim 1, characterized in that: The distance between the center of the first through hole (6) and the center of the second through hole (7) is d2, and the minimum distance between the first through hole (6) and an end of the tooth portion (1) facing away from the yoke portion (3) is d1, which satisfies 1.5≤d2 / d1.

7. The stator sheet according to claim 1, characterized in that: The tooth portion (1) has pole shoes on both sides of its back. The pole shoes are located on the tooth portion (1) near one end of the tooth portion (1) facing away from the yoke portion (3). The pole shoes include a first straight segment (12), a second straight segment (13) and an arc segment (14) connected in sequence. The first straight segment (12) is located on the side of the pole shoe facing the adjacent tooth portion (1), the second straight segment (13) is located on the side of the pole shoe facing the yoke portion (3), and the second straight segment (13) is connected to the tooth portion (1) via the arc segment (14).

8. The stator sheet according to claim 7, characterized in that: Along the radial direction of the stator sheet, the thickness of the pole shoe is d3, and the minimum distance between the end of the tooth portion (1) close to the tooth portion (1) facing away from the yoke portion (3) and the arc segment (14) is d4, which satisfies 0.75≤d4 / d3, 2mm≤d3.

9. The stator sheet according to claim 7, characterized in that: The arc segment (14) comprises a first segment and a second segment, the second segment is connected to the second straight segment (13), the second segment is connected to the tooth portion (1) via the first segment, the radius of the first segment is R, the radius of the second segment is r, which satisfies 3≤R / r≤5.

10. The stator sheet according to claim 1, characterized in that: A first groove is arranged on a side of the yoke (3) facing away from the tooth portion (1), the center of the first groove is arranged opposite to the tooth portion (1), and a third groove (10) and a plurality of second grooves (11) are arranged on a bottom wall (9) of the first groove, the plurality of second grooves (11) are evenly distributed on both sides of the third groove (10), and the second grooves (11) on both sides of the third groove (10) are symmetrically arranged about the center of the third groove (10).

11. The stator sheet according to claim 10, characterized in that: On either side of the third groove (10), a line connecting the centers of two adjacent second grooves (11) and the center of the stator punching sheet has an angle α, which satisfies 4.5°≤α≤5.5°.

12. The stator sheet according to claim 10, characterized in that: The bottom wall (9) is arranged concentrically with the outer circle of the stator punching sheet, and a radius difference Δd between the bottom wall (9) and the outer circle of the stator punching sheet satisfies: 0.6mm≤Δd≤0.8mm.

13. A stator core, characterized in that: The invention comprises the stator punching sheet according to any one of claims 1 to 12.

14. The stator core according to claim 13, characterized in that: The stator core comprises the stator punching sheet in the middle and the stator punching sheets at both ends, and buckle points are arranged on the first through hole (6) and the second through hole (7) of the stator punching sheets at both ends.

15. A motor, characterized in that: The invention comprises the stator core according to any one of claims 13 to 14.

16. A compressor, characterized in that: Includes the motor as claimed in claim 15.

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