Combined stator core, motor, compressor, air conditioner

Abstract

The present invention provides a combined stator core, a motor, a compressor, and an air conditioner. The stator core includes a first core punching group and a second core punching group. The first core punching group includes a plurality of spliced first tooth punching pieces and a first yoke punching piece. The second core punching group includes a plurality of spliced second tooth punching pieces and a second yoke punching piece. The first tooth punching piece and the second yoke punching piece are connected through a hinge point. The combined stator core has an annular yoke and tooth portions. Along the radially outward direction of the stator core, the annular yoke has a yoke region corresponding to the tooth portions, and the hinge point is arranged within the yoke region. In the present invention, the hinge point of the punching pieces is arranged within the annular yoke region corresponding to the tooth portions, which improves the structural strength of the hinged combined stator core, reduces the influence on the magnetic circuit of the stator yoke, is beneficial to improving the coaxiality of the stator core, reducing the air-gap magnetic field harmonics, reducing the motor noise, and improving the motor efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of motor manufacturing, and particularly relates to a combined stator core, a motor, a compressor, and an air conditioner. Background Art

[0002] Environmental protection and energy conservation are important concerns for the sustainable development of society. With the improvement of living quality, the popularity of refrigeration air conditioners has increased. According to statistics, the power consumption of refrigeration air conditioners nationwide accounts for 20% of the annual power consumption. As an important component of refrigeration air conditioners, the compressor has the largest energy consumption ratio. Therefore, reducing the loss and improving the efficiency of the motor in the compressor has become a key issue. Further increasing the slot fill factor of the motor helps to reduce the winding resistance, thereby reducing the copper loss of the motor and improving the motor efficiency.

[0003] For a conventional integral circular stator core, when using a concentrated winding stator, the winding nozzle needs to be inserted into the stator slot for winding during winding. Therefore, the winding nozzle occupies a part of the slot area, resulting in a limited slot fill factor for winding. Currently, in the industry, the form of a segmented stator core is usually adopted. After winding each piece of core, they are spliced into a complete circle to eliminate the slot area occupied by the winding nozzle. However, the current segmented core structure also has many problems, such as large magnetic field loss at the splicing point, resulting in a certain reduction in motor efficiency. At the same time, the stiffness at the splicing point is low, the stator vibration and noise deteriorate, the coaxiality of the inner circle of the stator after splicing is poor, the air gap magnetic field harmonics increase, and the motor vibration and noise deteriorate. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a combined stator core, a motor, a compressor, and an air conditioner, in which the hinge points of the punching sheets are arranged in the annular yoke area corresponding to the tooth parts, improving the structural strength of the hinged combined stator core, reducing the influence on the magnetic circuit of the stator yoke, being beneficial to improving the coaxiality of the stator core, reducing the air gap magnetic field harmonics, reducing the motor noise and improving the motor efficiency.

[0005] To solve the above problems, the present invention provides a combined stator core, including a first core punching sheet group and a second core punching sheet group arranged axially along the stator core. The first core punching sheet group includes a plurality of spliced first tooth part punching sheets and first yoke part punching sheets. The second core punching sheet group includes a plurality of spliced second tooth part punching sheets and second yoke part punching sheets. The first tooth part punching sheet is connected to the second yoke part punching sheet through a hinge point. The first yoke part punching sheet is connected to the second yoke part punching sheet. The second tooth part punching sheet is connected to the first tooth part punching sheet. After the hinged combination, the stator core has an annular yoke and tooth parts. Along the radially outward direction of the stator core, there is a yoke area on the annular yoke corresponding to the tooth parts, and the hinge point is arranged in the yoke area.

[0006] Preferably, the outer diameter of the stator core is D1, the hinge point is a circular groove or a circular through-hole, the center of the hinge point is on the distribution circle, the diameter of the distribution circle is D2, the circle passing through the junction of the tooth part and the annular yoke part is the tooth part boundary circle, the diameter of the tooth part boundary circle is D5, the distribution circle, the tooth part boundary circle and the outer circle of the stator core are concentric, and D5 < D2 < D1.

[0007] Preferably, the center of the hinge point is on the central symmetry line of the tooth part.

[0008] Preferably, the second splicing line between any two adjacent second tooth part laminations and second yoke part laminations in the second core lamination group includes a second splicing arc segment, the center of curvature of the second splicing arc segment coincides with the center of the hinge point, and the radius of curvature of the second splicing arc segment is D4 / 2, and D2 - D4 / 2 > D5.

[0009] Preferably, the tooth part includes a winding post, any plane perpendicular to the axis line of the stator core is the first projection plane, and the circumferential width of the projection of the winding post on the first projection plane is L1, and D4 ≤ L1.

[0010] Preferably, in the radial direction of the stator core, the annular yoke part between two adjacent tooth parts has a recessed groove recessed toward the outside of the stator core, the minimum thickness between the bottom wall of the recessed groove and the outer peripheral wall of the stator core is L2, and L2 ≥ 0.75·L1.

[0011] Preferably, the diameter of the hinge point is D3, and 1mm ≤ D3 ≤ 0.5·L2.

[0012] Preferably, on the first projection plane, the projection of the recessed groove is an intersecting first straight line segment and second straight line segment, the first straight line segment and the second straight line segment are mirror images of each other, and an included angle a3 is formed between the first straight line segment and / or the second straight line segment and the circumferential side wall of the adjacent winding post.

[0013] 80° < a3 < 100°.

[0014] Preferably, the second splicing line further includes a second splicing straight line segment, the outer end of the second splicing straight line segment relative to the stator core is tangent to the second splicing arc segment, and the inner end of the second splicing straight line segment relative to the stator core is on the tooth part boundary circle.

[0015] Preferably, an included angle a2 is formed between the second splicing straight line segment and the central symmetry line.

[0016] 90° < a2 < 180°.

[0017] Preferably, the first splicing line between any two adjacent first tooth portion punching sheets and the first yoke portion punching sheet in the first iron core punching sheet group includes a first splicing arc segment, and the center of curvature of the first splicing arc segment coincides with the center of the hinge point.

[0018] Preferably, the first splicing line further includes a first splicing straight segment, and an included angle a1 is formed between the second splicing straight segment and the central symmetry line, where 90° < a1 < 180° and a1 < a2.

[0019] Preferably, the combined stator iron core further includes a third iron core punching sheet group, which includes a plurality of spliced third tooth portion punching sheets and third yoke portion punching sheets. The first tooth portion punching sheet is connected to the third yoke portion punching sheet through the hinge point, the first yoke portion punching sheet is connected to the third yoke portion punching sheet, the third tooth portion punching sheet is connected to the first tooth portion punching sheet, the third tooth portion punching sheet is structurally the same as the second tooth portion punching sheet, and the third yoke portion punching sheet and the second yoke portion punching sheet are mirror images of each other in structure. The first iron core punching sheet group is located between the second iron core punching sheet group and the third iron core punching sheet group.

[0020] The present invention also provides a motor, including a stator iron core, and the stator iron core is the above-mentioned combined stator iron core.

[0021] The present invention also provides a compressor, including the above-mentioned motor.

[0022] The present invention also provides an air conditioner, including the above-mentioned compressor.

[0023] For a combined stator iron core, a motor, a compressor, and an air conditioner provided by the present invention, by setting the hinge point in the yoke region corresponding to the tooth portion, the adverse influence on the magnetic circuit of the stator yoke due to the setting of the hinge point can be avoided to the greatest extent. At the same time, setting the hinge point in this region can also improve the structural strength of the hinged combined stator iron core. Specifically, because this region can avoid the small radial dimension position of the yoke between the two tooth portions. When the stator iron core and the external housing are assembled with an interference fit, the deformation amount of the stator iron core after being stressed will be smaller due to the improvement of the structural strength, which is beneficial to improving the coaxiality of the stator iron core, reducing the air gap magnetic field harmonics, reducing the motor noise, and improving the motor efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a three-dimensional structural schematic diagram of the combined stator iron core according to an embodiment of the present invention;

[0025] Figure 2 is Figure 1 the structural schematic diagram of the first iron core punching sheet group in

[0026] Figure 3 isFigure 2 Schematic diagram of the structure of the first tooth punching sheet in

[0027] Figure 4 is Figure 2 Schematic diagram of the structure of the first yoke punching sheet in

[0028] Figure 5 is Figure 1 Schematic diagram of the structure of the second iron core punching sheet group in

[0029] Figure 6 is Figure 5 Partial enlarged view at position A in

[0030] Figure 7 is Figure 5 Schematic diagram of the structure of the second tooth punching sheet in

[0031] Figure 8 is Figure 5 Schematic diagram of the structure of the second yoke punching sheet in

[0032] Figure 9 is Figure 1 Schematic diagram of the structure of the third iron core punching sheet group in

[0033] Figure 10 is Figure 9 Schematic diagram of the structure of the third yoke punching sheet in

[0034] Figure 11 is Figure 2 Schematic diagram of the structure of the first iron core punching sheet group in the rotated and unfolded state

[0035] Figure 12 is Figure 5 Schematic diagram of the structure of the second iron core punching sheet group in the rotated and unfolded state

[0036] Figure 13 is Figure 9 Schematic diagram of the structure of the third iron core punching sheet group in the rotated and unfolded state

[0037] Figure 14 Comparison of the motor efficiency of the motor adopting the technical solution of the present invention and the motor in the prior art at different speeds (operating frequencies)

[0038] Figure 15 Comparison of the noise within 1000 Hz of the compressor adopting the technical solution of the present invention and the compressor in the prior art at different speeds (operating frequencies)

[0039] The reference signs are shown as:

[0040] 1. First iron core punching group; 11. First tooth punching; 12. First yoke punching; 2. Second iron core punching group; 21. Second tooth punching; 22. Second yoke punching; 3. Hinge point; 41. Second splicing arc segment; 42. Second splicing straight segment; 51. First splicing arc segment; 52. First splicing straight segment; 6. Third iron core punching group; 61. Third tooth punching; 62. Third yoke punching; 100. Ring yoke; 1001. Concave groove; 101. Tooth part; 1011. Winding post. Detailed implementation mode

[0041] Referring to Figures 1 to 15 As shown, according to an embodiment of the present invention, a combined stator core is provided, which includes a first iron core punching group 1 and a second iron core punching group 2 arranged along the axial direction of the stator core. The first iron core punching group 1 includes a plurality of spliced first tooth punchings 11 and first yoke punchings 12. The second iron core punching group 2 includes a plurality of spliced second tooth punchings 21 and second yoke punchings 22. The first tooth punching 11 and the second yoke punching 22 are connected through a hinge point 3. The first yoke punching 12 and the second yoke punching 22 are connected. The second tooth punching 21 and the first tooth punching 11 are connected. Under the action of an external force, the first tooth punching 11 and the second yoke punching 22 can rotate around the hinge point 3, and the second tooth punching 21 rotates following the first tooth punching 11, and the first yoke punching 12 rotates following the second yoke punching 22. The stator core formed by the articulated combination of the first iron core punching group 1 and the second iron core punching group 2 has a ring yoke 100 and a tooth part 101. Along the radially outward direction of the stator core, the ring yoke 100 has a yoke area corresponding to the tooth part 101, and the hinge point 3 is arranged in the yoke area. The first yoke punching 12 and the second yoke punching 22 and the first tooth punching 11 and the second tooth punching 21 can be connected as a whole through, for example, square snap points or bonding, so as to realize the follow-up movement of the first tooth punching 11 and the second yoke punching 22 when rotating around the hinge point 3. It can be understood that the first iron core punching group 1 and the second iron core punching group 2 are alternately arranged axially of the stator core to form a stack, thereby forming the stator core, and the formed stator core has the ring yoke 100 and the tooth part 101 as a whole, and the ring yoke 100 includes the bottom (outer) parts of the first yoke punching 12 and the first tooth punching 11 in the first iron core punching group 1, and the bottom (outer) parts of the second yoke punching 22 and the second tooth punching 21 in the second iron core punching group 2. The aforementioned yoke area corresponding to the tooth part 101 is specifically as Figure 2 , Figure 5 or Figure 8The corresponding area of the annular yoke 100 corresponding to the tooth root part of the winding column 1011 shown in the figure. The magnetic flux in this area is relatively small when there are magnetic lines of force in the stator core. Setting the hinge point 3 in this area can avoid the adverse effect on the magnetic circuit of the stator yoke to the greatest extent. At the same time, setting the hinge point 3 in this area can also improve the structural strength of the hinged combined stator core. Specifically, because this area can avoid the small radial dimension position of the yoke between the two tooth parts. When the stator core and the external housing are assembled by interference fit, the deformation amount of the stator core after being stressed will be smaller due to the improvement of the structural strength. This is beneficial to improving the coaxiality of the stator core, reducing the air gap magnetic field harmonics, reducing the motor noise and improving the motor efficiency.

[0042] Furthermore, the outer diameter of the stator core is D1, the hinge point 3 is a circular groove or a circular through hole, the center of the hinge point 3 is on the distribution circle, the diameter of the distribution circle is D2, the circle passing through the intersection of the tooth part 101 and the annular yoke 100 is the tooth part boundary circle, and the diameter of the tooth part boundary circle is D5. The distribution circle, the tooth part boundary circle and the outer circle of the stator core are concentric, and D5 < D2 < D1. At this time, the setting position of the hinge point 3 is limited outside the tooth root position of the tooth part 101, that is, it is completely on the annular yoke 100 without occupying the position of the tooth part 101, so as to prevent the adverse effect on the magnetic circuit. Preferably, the center of the hinge point 3 is on the central symmetry line of the tooth part 101, so that the replaceability of the punching sheets of the first iron core punching sheet group 1 and / or the second iron core punching sheet group 2 is stronger, and at the same time, the symmetry of the stator core in the assembled structure is better.

[0043] As Figure 5As shown, the second splicing line between any two adjacent second tooth portion punching sheets 21 and second yoke portion punching sheets 22 in the second iron core punching sheet group 2 includes a second splicing arc segment 41. The center of curvature of the second splicing arc segment 41 coincides with the center of the hinge point 3, and the radius of curvature of the second splicing arc segment 41 is D4 / 2, and D2 - D4 / 2 > D5. The aforementioned second splicing line is essentially defined by the outer contour shape of the adjacent positions of the second tooth portion punching sheet 21 and the second yoke portion punching sheet 22. By defining the size relationship of D2, D4, and D5, it is possible to prevent the second splicing arc segment 41 from intruding into the position of the tooth portion 101 and reduce the adverse effect of the splicing line gap on the magnetic flux. At the same time, it can be understood that the second splicing arc segment 41 can ensure smooth hinge rotation and ensure the smallest splicing gap. Specifically, the tooth portion 101 (the tooth portion 101 is substantially formed by the corresponding parts of the first tooth portion punching sheet 11 and the second tooth portion punching sheet 21, and their outer contours are the same) includes a winding column 1011. Any plane perpendicular to the axis line of the stator iron core is the first projection plane. On the first projection plane, the circumferential width of the projection of the winding column 1011 is L1, and D4 ≤ L1.

[0044] In the radial direction of the stator iron core, the annular yoke portion 100 between two adjacent tooth portions 101 has a recessed groove 1001 recessed toward the outside of the stator iron core. The minimum thickness between the bottom wall of the recessed groove 1001 and the outer peripheral wall of the stator iron core is L2, and L2 ≥ 0.75·L1, so as to avoid excessive saturation of the yoke magnetic density and affect the motor torque output. At this time, the diameter of the corresponding hinge point 3 is D3, and 1mm ≤ D3 ≤ 0.5·L2, which can prevent the hinge point from being too large and causing a greater impact on the magnetic field while ensuring a relatively high hinge strength of the hinge point.

[0045] On the first projection plane, the projection of the recessed groove 1001 is an intersecting first straight line segment and second straight line segment. The first straight line segment and the second straight line segment are mirror images of each other. An included angle a3 is formed between the first straight line segment and / or the second straight line segment and the circumferential side wall of the adjacent winding column 1011, and 80° < a3 < 100°. In this way, it is possible to ensure high-speed winding of the stator iron core in the unfolded state and improve production efficiency.

[0046] The second splicing line further includes a second splicing straight segment 42. The outer end of the second splicing straight segment 42 relative to the stator core is tangent to the second splicing arc segment 41, and the inner end of the second splicing straight segment 42 relative to the stator core is located on the tooth boundary circle, so as to ensure that the whole second splicing line does not intrude into the tooth part 101 (winding post 1011), and minimize the adverse effect of the splicing line on the magnetic circuit to the greatest extent. Further, an included angle a2 is formed between the second splicing straight segment 42 and the central symmetry line, and 90° < a2 < 180°. While ensuring that the second splicing line does not extend onto the tooth part 101, it will not cause the connection between the tooth part and the yoke part on the punching sheet to be too narrow, and ensure the structural strength of each punching sheet.

[0047] Similar to the second iron core punching sheet group 2, the first splicing line between any two adjacent first tooth punching sheets 11 and first yoke punching sheets 12 in the first iron core punching sheet group 1 includes a first splicing arc segment 51, and the center of curvature of the first splicing arc segment 51 coincides with the center of the hinge point 3. The first splicing line further includes a first splicing straight segment 52. The outer end of the first splicing straight segment 52 relative to the stator core is tangent to the first splicing arc segment 51, and the inner end of the first splicing straight segment 52 relative to the stator core is located on the tooth boundary circle. An included angle a1 is formed between the second splicing straight segment 42 and the central symmetry line, and 90° < a1 < 180° and a1 < a2.

[0048] Further, the combined stator core may further include a third iron core punching sheet group 6.

[0049] The third core punching sheet group 6 includes a plurality of spliced third tooth punching sheets 61 and third yoke punching sheets 62. The first tooth punching sheet 11 and the third yoke punching sheet 62 are connected by the hinge point 3. The first yoke punching sheet 12 is connected to the third yoke punching sheet 62. The third tooth punching sheet 61 is connected to the first tooth punching sheet 11. Under the action of an external force, the first tooth punching sheet 11 and the third yoke punching sheet 62 can rotate around the hinge point 3, and the third tooth punching sheet 61 rotates following the first tooth punching sheet 11. The first yoke punching sheet 12 rotates following the third yoke punching sheet 62. The third tooth punching sheet 61 and the second tooth punching sheet 21 are the same in structure, and the third yoke punching sheet 62 and the second yoke punching sheet 22 are mirror images of each other in structure. The first core punching sheet group 1 is located between the second core punching sheet group 2 and the third core punching sheet group 6. At this time, the first core punching sheet group 1, the second core punching sheet group 2, and the third core punching sheet group 6 are arranged along the axial direction of the stator core according to a preset rule. Since the third yoke punching sheet 62 and the second yoke punching sheet 22 are mirror images of each other, the preset rule is, for example, that the second core punching sheet group 2 and the third core punching sheet group 6 are respectively located at the two axial end faces of the first core punching sheet group 1, which can effectively offset the machining errors (form and position) of each punching sheet at the hinge point 3, making the connection of the combined stator core more reliable and the contact between the stacked punching sheets closer.

[0050] The first core punching sheet group 1, the second core punching sheet group 2, and the third core punching sheet group 6 can be stacked with multiple sheets along the axial direction of the stator core within the group. The axial thickness t of each single punching sheet is ≤ 0.5 mm, and the preferred punching sheet material is non-oriented cold-rolled electrical steel.

[0051] The hinge point 3 can be, for example, a circular convex platform on the upper punching sheet and a circular groove on the lower punching sheet (actually, convex points punched at the predetermined positions of the punching sheet). The circular convex platform is fitted into the circular groove to form a rotatable structure. When the diameter of the hinge point 3 is large enough, the corresponding convex points can also be directly punched and removed to form a unified through hole. At this time, multiple through holes can be riveted with non-magnetic rivets.

[0052] To verify the actual effect of the combined stator core using the technical solution of the present invention, the inventor conducted experimental tests on the motor efficiency of the motor using it and the noise of the compressor within 1000 Hz using it. The results are respectively shown in Figure 14 、 Figure 15 as shown. It can be seen from Figure 14 that the motor efficiency of the motor using the technical solution of the present invention is significantly improved at the motor operating frequencies of 30 Hz, 60 Hz, and 90 Hz; it can be seen from Figure 15It can be seen that the noise within 1000 Hz of the compressor adopting the technical solution of the present invention is significantly reduced at the operating frequencies of 30 Hz, 60 Hz, and 90 Hz.

[0053] According to an embodiment of the present invention, there is also provided a motor, including a stator core, and the stator core is the above-mentioned combined stator core.

[0054] According to an embodiment of the present invention, there is also provided a compressor, including the above-mentioned motor.

[0055] According to an embodiment of the present invention, there is also provided an air conditioner, including the above-mentioned compressor.

[0056] It is easily understood by those skilled in the art that, on the premise of no conflict, the above-mentioned advantageous manners can be freely combined and superimposed.

[0057] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, 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 is only the preferred implementation manner of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A combined stator core, characterized in that, It includes a first core lamination group (1) and a second core lamination group (2) arranged axially along the stator core. The first core lamination group (1) includes a plurality of spliced first tooth lamination sheets (11) and first yoke lamination sheets (12). The second core lamination group (2) includes a plurality of spliced second tooth lamination sheets (21) and second yoke lamination sheets (22). The first tooth lamination sheet (11) is connected to the second yoke lamination sheet (22) through a hinge point (3). The first yoke lamination sheet (12) is connected to the second yoke lamination sheet (22). The second tooth lamination sheet (21) is connected to the first tooth lamination sheet (11). The stator core after articulated combination has an annular yoke portion (100) and tooth portions (101). Along the radially outward direction of the stator core, the annular yoke portion (100) has a yoke region corresponding to the tooth portions (101), and the hinge point (3) is arranged within the yoke region. The outer diameter of the stator core is D1. The hinge point (3) is a circular groove or a circular through-hole. The center of the hinge point (3) is on a distribution circle, and the diameter of the distribution circle is D2. The circle passing through the junction of the tooth portion (101) and the annular yoke portion (100) is the tooth boundary circle, and the diameter of the tooth boundary circle is D5. The distribution circle, the tooth boundary circle and the outer circle of the stator core are concentric, and D5 < D2 < D1. The second splicing line between any two adjacent second tooth lamination sheets (21) and second yoke lamination sheets (22) in the second core lamination group (2) includes a second splicing arc segment (41). The center of curvature of the second splicing arc segment (41) coincides with the center of the hinge point (3), and the radius of curvature of the second splicing arc segment (41) is D4 / 2, and D2 - D4 / 2 > D5. The tooth portion (101) includes a winding post (1011). Any plane perpendicular to the axis line of the stator core is a first projection plane. On the first projection plane, the circumferential width of the projection of the winding post (1011) is L1, and D4 ≤ L1.

2. The stator core according to claim 1, characterized in that, In the radial direction of the stator core, the annular yoke portion (100) between two adjacent tooth portions (101) has a recessed groove (1001) recessed towards the outside of the stator core. The minimum thickness between the bottom wall of the recessed groove (1001) and the outer peripheral wall of the stator core is L2, and L2 ≥ 0.75·L1.

3. The stator core according to claim 2, characterized in that, The diameter of the hinge point (3) is D3, and 1mm ≤ D3 ≤ 0.5·L2.

4. The stator core according to claim 2, characterized in that, On the first projection plane, the projection of the recessed groove (1001) is an intersecting first straight line segment and a second straight line segment. The first straight line segment and the second straight line segment are mirror images of each other. An angle a3 is formed between the first straight line segment and / or the second straight line segment and the circumferential side wall of the adjacent winding post (1011), and 80° < a3 < 100°.

5. The stator core according to claim 1, characterized in that, The second splicing line further includes a second splicing straight segment (42). One end of the second splicing straight segment (42) relative to the outer side of the stator core is tangent to the second splicing arc segment (41), and the other end of the second splicing straight segment (42) relative to the inner side of the stator core is located on the tooth boundary circle.

6. The stator core according to claim 5, characterized in that, An included angle a2 is formed between the second splicing straight segment (42) and the central symmetry line, where 90° < a2 < 180°.

7. The stator core according to claim 6, characterized in that, The first splicing line between any two adjacent first tooth portion punching sheets (11) and the first yoke portion punching sheet (12) in the first iron core punching sheet group (1) includes a first splicing arc segment (51), and the center of curvature of the first splicing arc segment (51) coincides with the center of the hinge point (3).

8. The stator core according to claim 7, characterized in that, The first splicing line further includes a first splicing straight segment (52). An included angle a1 is formed between the second splicing straight segment (42) and the central symmetry line, where 90° < a1 < 180° and a1 < a2.

9. The stator core according to claim 1, wherein It further includes a third iron core punching sheet group (6). The third iron core punching sheet group (6) includes a plurality of spliced third tooth portion punching sheets (61) and third yoke portion punching sheets (62). The first tooth portion punching sheet (11) is connected to the third yoke portion punching sheet (62) through the hinge point (3). The first yoke portion punching sheet (12) is connected to the third yoke portion punching sheet (62). The third tooth portion punching sheet (61) is connected to the first tooth portion punching sheet (11). The third tooth portion punching sheet (61) has the same structure as the second tooth portion punching sheet (21), and the third yoke portion punching sheet (62) and the second yoke portion punching sheet (22) are mirror images of each other in structure. The first iron core punching sheet group (1) is located between the second iron core punching sheet group (2) and the third iron core punching sheet group (6).

10. A motor, comprising a stator core, characterized in that, The stator core is the combined stator core according to any one of claims 1 to 9.

11. A compressor, comprising an electric motor, characterized in that, The motor is the motor according to claim 10.

12. An air conditioner, comprising a compressor, characterized in that, The compressor is the compressor according to claim 11.

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