CN212304907U - Combined stator core, motor, compressor and air conditioner - Google Patents

Abstract

The utility model provides a modular stator core, including a motor, an end cap, a controller, and a cover plate, a compressor, an air conditioner, stator core wherein includes first iron core towards piece group, second iron core towards piece group, first iron core towards piece group including the first tooth portion of a plurality of concatenations towards piece, first yoke portion towards piece, second iron core towards piece group including the second tooth portion of a plurality of concatenations towards piece, second yoke portion towards piece, first tooth portion towards piece and second yoke portion towards being connected through the pin joint between the piece, stator core after the combination has annular yoke portion and tooth portion, along stator core's radial outside direction, the yoke portion that corresponds with the tooth portion has on the annular yoke portion is regional, the pin joint sets up in yoke portion region. The utility model discloses to set up towards the piece pin joint in the annular yoke portion region that corresponds with tooth portion, promoted articulated combination formula stator core's structural strength, reduced the magnetic circuit influence to stator yoke portion, be favorable to promoting stator core's axiality, reduce air gap magnetic field harmonic, reduce motor noise and promote motor efficiency.

Description

Combined stator core, motor, compressor and air conditioner

Technical Field

The utility model belongs to the technical field of the motor is made, concretely relates to modular stator core, motor, compressor, air conditioner.

Background

Environmental protection and energy conservation are important concerns for social sustainable development. Along with the improvement of the quality of life, the popularity of the refrigeration air conditioner is increased, the power consumption of the refrigeration air conditioner accounts for 20% of the annual power consumption on the national scale according to statistics, and the compressor is used as an important component of the refrigeration air conditioner, the power consumption proportion is the largest, so that the reduction of the loss of the motor in the compressor and the improvement of the efficiency become key problems. Further promote the full rate of motor groove, help reducing winding resistance, and then reduce motor copper loss, improve motor efficiency.

For a conventional stator core with a full-circle structure, a concentrated winding stator is adopted, and a winding nozzle needs to extend into a stator slot for winding during winding, so that the winding nozzle needs to occupy a part of the slot area, and the slot fullness rate of winding is limited. At present, the form of a stator core block is commonly adopted in the industry, each iron core block is spliced into a whole circle after being wound with wires, and the groove area occupied by a winding nozzle is eliminated. But the current blocking iron core structure also has a lot of problems, for example, the magnetic field loss at the splicing part is large, so that the motor efficiency is reduced to a certain extent, meanwhile, the rigidity at the splicing part is low, the vibration noise of the stator is deteriorated, the coaxiality of inner circles of the spliced stator is poor, the air gap magnetic field harmonic wave is increased, and the vibration noise of the motor is deteriorated.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in providing a modular stator core, motor, compressor, air conditioner, will set up in the annular yoke portion region that corresponds with tooth portion towards the piece pin joint, promoted articulated combination formula stator core's structural strength, reduced the magnetic circuit influence to stator yoke portion, be favorable to promoting stator core's axiality, reduce air gap magnetic field harmonic, reduce motor noise and promote motor efficiency.

In order to solve the problems, the utility model provides a combined stator core, which comprises a first core punching sheet group and a second core punching sheet group which are arranged along the axial direction of the stator core, the first iron core punching sheet group comprises a plurality of spliced first tooth punching sheets and a plurality of spliced first yoke punching sheets, the second iron core punching sheet group comprises a plurality of spliced second tooth punching sheets and a plurality of spliced second yoke punching sheets, the first tooth punching sheet and the second yoke punching sheet are connected through a hinge joint, the first yoke punching sheet and the second yoke punching sheet are connected, the second tooth punching sheet is connected with the first tooth punching sheet, the stator core after hinged combination is provided with an annular yoke part and a tooth part, the stator core is arranged along the radial outward direction of the stator core, the annular yoke is provided with a yoke area corresponding to the tooth part, and the hinge point is arranged in the yoke area.

Preferably, the diameter of the outer circle 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 located on a distribution circle, the diameter of the distribution circle is D2, a circle passing through the junction of the tooth portion and the annular yoke portion is a tooth portion boundary circle, the diameter of the tooth portion boundary circle is D5, the distribution circle, the tooth portion boundary circle and the outer circle of the stator core are concentric, and D5 < D2 < D1.

Preferably, the center of the hinge point is located on the central symmetry line of the tooth portion.

Preferably, a second splicing line between any two adjacent second tooth punching sheets and a second yoke punching sheet in the second iron core punching sheet group comprises a second splicing arc line segment, the curvature center of the second splicing arc line segment is overlapped with the circle center of the hinge point, the curvature radius of the second splicing arc line segment is D4/2, and D2-D4/2 is greater than D5.

Preferably, the tooth portion includes a winding post, any plane perpendicular to the axial line of the stator core is a first projection plane, the projection circumferential width of the winding post on the first projection plane is L1, and D4 ≤ L1.

Preferably, the annular yoke part between two adjacent tooth parts has a concave groove recessed towards the outside of the stator core in the radial direction of the stator core, the minimum thickness between the groove bottom wall of the concave groove and the outer peripheral wall of the stator core is L2, and L2 is more than or equal to 0.75-L1.

Preferably, the diameter of the hinge point is D3, and D3 is not less than 1mm and not more than 0.5. L2.

Preferably, on the first projection plane, the projection of the concave groove is a first straight line segment and a second straight line segment which are intersected, 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 winding post which is adjacent to the first straight line segment, and 80 degrees < a3<100 degrees.

Preferably, the second splicing line further includes a second splicing straight line segment, one end of the second splicing straight line segment, which is opposite to the outer side of the stator core, is tangent to the second splicing arc line segment, and one end of the second splicing straight line segment, which is opposite to the inner side of the stator core, is located on the tooth part boundary circle.

Preferably, the second straight splicing line segment forms an included angle a2 with the central symmetry line, 90 ° < a2<180 °.

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

Preferably, the first splicing line further comprises a first splicing straight line segment, and the second splicing straight line segment forms an included angle a1 with the central symmetry line, 90 degrees < a1<180 degrees and a1< a 2.

Preferably, the combined stator core further comprises a third core punching sheet group, the third core punching sheet group comprises a plurality of spliced third tooth punching sheets and third yoke punching sheets, the first tooth punching sheets are connected with the third yoke punching sheets through the hinge joints, the first yoke punching sheets are connected with the third yoke punching sheets, the third tooth punching sheets are connected with the first tooth punching sheets, the third tooth punching sheets are structurally identical to the second tooth punching sheets, the third yoke punching sheets are structurally mirror images of the second yoke punching sheets, and the first core punching sheet group is located between the second core punching sheet group and the third core punching sheet group.

The utility model also provides a motor, including stator core, stator core is foretell combination formula stator core.

The utility model also provides a compressor, including foretell motor.

The utility model also provides an air conditioner, including foretell compressor.

The utility model provides a pair of modular stator core, motor, compressor, air conditioner, with the pin joint set up in with the yoke portion region that the tooth portion corresponds, can be furthest avoid because set up the adverse effect of pin joint to stator yoke portion magnetic circuit, simultaneously, will the pin joint sets up the structural strength that can also promote the hinge combination formula stator core in this region, specifically because this region can avoid the radial little size position of yoke portion between two teeth, when stator core and outside casing adopt interference fit to assemble, the deflection behind the stator core atress will be littleer because structural strength's promotion, this axiality that is favorable to promoting stator core reduces air gap magnetic field harmonic, reduces motor noise promotion motor efficiency.

Drawings

Fig. 1 is a schematic perspective view of a combined stator core according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a first core punching sheet set in fig. 1;

fig. 3 is a schematic structural diagram of the first tooth segment in fig. 2;

fig. 4 is a schematic structural view of the first yoke segment of fig. 2;

fig. 5 is a schematic structural view of a second core punching sheet set in fig. 1;

FIG. 6 is an enlarged view of a portion of FIG. 5 at A;

FIG. 7 is a schematic structural view of the second tooth punching sheet in FIG. 5;

fig. 8 is a schematic structural view of the second yoke segment of fig. 5;

FIG. 9 is a schematic structural view of a third iron core punching sheet set in FIG. 1;

fig. 10 is a schematic structural view of the third yoke segment of fig. 9;

fig. 11 is a schematic structural diagram of the first iron core punching set in fig. 2 in a rotationally unfolded state;

fig. 12 is a schematic structural view of the second core punching sheet set in fig. 5 in a rotating and unfolding state;

FIG. 13 is a schematic structural diagram of the third iron core punching sheet set in FIG. 9 in a rotating and unfolding state;

fig. 14 is a comparison of motor efficiency of the motor adopting the technical solution of the present invention and the motor of the prior art at different rotation speeds (operation frequencies);

fig. 15 is a comparison of 1000Hz internal noise of the compressor adopting the technical solution of the present invention and the compressor in the prior art at different rotation speeds (operation frequencies).

The reference numerals are represented as:

1. a first iron core punching sheet group; 11. a first tooth punching sheet; 12. a first yoke segment; 2. a second iron core punching sheet group; 21. a second tooth punching sheet; 22. a second yoke segment; 3. a hinge point; 41. a second spliced arc segment; 42. a second splicing straight line section; 51. a first splicing arc segment; 52. a first splicing straight line section; 6. a third iron core punching sheet group; 61. a third tooth punching sheet; 62. a third yoke segment; 100. an annular yoke; 1001. a recessed groove; 101. a tooth portion; 1011. and (4) winding the wire column.

Detailed Description

With reference to fig. 1 to 15 in combination, according to an embodiment of the present invention, a combined stator core is provided, which includes a first core punching sheet set 1 and a second core punching sheet set 2 axially arranged along the stator core, where the first core punching sheet set 1 includes a plurality of first tooth punching sheets 11 and a first yoke punching sheet 12 which are spliced together, the second core punching sheet set 2 includes a plurality of second tooth punching sheets 21 and a second yoke punching sheet 22 which are spliced together, the first tooth punching sheet 11 and the second yoke punching sheet 22 are connected through a hinge point 3, the first yoke punching sheet 12 and the second yoke punching sheet 22 are connected, the second tooth punching sheet 21 and the first tooth punching sheet 11 are connected, and under an external force, the first tooth punching sheet 11 and the second yoke punching sheet 22 can rotate around the hinge point 3, and the second tooth punching sheet 21 rotates along with the first tooth punching sheet 11, first yoke punching sheet 12 follows second yoke punching sheet 22 rotates, first iron core punching sheet group 1 with stator core after the articulated combination of second iron core punching sheet group 2 has annular yoke portion 100 and tooth portion 101, follows stator core's radial outside direction, have on the annular yoke portion 100 with the yoke portion region that tooth portion 101 corresponds, pin joint 3 set up in the yoke portion region, first yoke punching sheet 12 with between the second yoke punching sheet 22 and first tooth punching sheet 11 with can connect through square knot point or bond as an organic wholely between the second tooth punching sheet 21 for example, in order to realize first tooth punching sheet 11 with second yoke punching sheet 22 centers on follow-up when pin joint 3 is rotatory. It can be understood that the first core punching sheet group 1 and the second core punching sheet group 2 are alternately arranged in the axial direction of the stator core to form a lamination, so as to form the stator core, and the formed stator core integrally has the annular yoke portion 100 and the tooth portion 101, and the annular yoke portion 100 includes the first yoke punching sheet 12 in the first core punching sheet group 1, the bottom end (outer side) portion of the first tooth punching sheet 11, and the second yoke punching sheet 22 in the second core punching sheet group 2 and the bottom end (outer side) portion of the second tooth punching sheet 21. The yoke region corresponding to the tooth 101 is specifically the corresponding region of the annular yoke 100 corresponding to the tooth root of the winding post 1011 as shown in fig. 2, 5 or 8, where the magnetic flux is relatively small when there is magnetic force lines in the stator core, and the arrangement of the hinge point 3 in this region can maximally avoid the adverse effect on the magnetic circuit of the stator yoke due to the arrangement of the hinge point, and meanwhile, the arrangement of the hinge point 3 in this region can also improve the structural strength of the hinge combined stator core, specifically because this region can avoid the radial small-size position of the yoke between two teeth, when the stator core is assembled with the outer housing in an interference fit manner, the deformation of the stator core after being stressed is smaller due to the improvement of the structural strength, which is favorable for improving the coaxiality of the stator core and reducing air-gap magnetic field harmonics, reduce motor noise and promote motor efficiency.

Further, the diameter of the outer circle 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 located on a distribution circle, the diameter of the distribution circle is D2, a circle passing through the boundary between the tooth 101 and the annular yoke 100 is a tooth boundary circle, the diameter of the tooth boundary circle is D5, the distribution circle and the tooth boundary circle are concentric with the outer circle of the stator core, D5 < D2 < D1, the setting position of the hinge point 3 is limited outside the tooth root position of the tooth 101, even if the hinge point is completely located on the annular yoke 100 and does not occupy the tooth 101, the adverse effect on the magnetic circuit is prevented. Preferably, the center of the hinge point 3 is located on the central symmetry line of the tooth portion 101, so that the laminations of the first core lamination group 1 and/or the second core lamination group 2 are more stackable, and the stator core is more symmetrical in structure after assembly.

As shown in fig. 5, a second splicing line between any two adjacent second tooth punching sheets 21 and second yoke punching sheets 22 in the second core punching sheet group 2 includes a second splicing arc line segment 41, a curvature center of the second splicing arc line segment 41 coincides with a circle center of the hinge point 3, a curvature radius of the second splicing arc line segment 41 is D4/2, D2-D4/2 > D5, the second splicing line is essentially defined by an outline shape of an adjacent position of the second tooth punching sheets 21 and the second yoke punching sheets 22, and by defining a size relationship of D2, D4, and D5, a position where the second splicing arc line segment 41 intrudes into the tooth 101 can be prevented, and an adverse effect of a splicing line gap on magnetic flux is reduced. Meanwhile, it can be understood that the second splicing arc segment 41 can ensure smooth hinging and can ensure the minimum splicing gap. Specifically, the tooth 101 (the tooth 101 is substantially formed by corresponding portions of the first tooth stamped piece 11 and the second tooth stamped piece 21 together, and the outline shapes of the tooth 101 and the second tooth stamped piece are identical) includes a winding post 1011, any plane perpendicular to the axial line of the stator core is a first projection plane, the circumferential width of the projection of the winding post 1011 on the first projection plane is L1, and D4 is not less than L1.

In the radial direction of the stator core, the annular yoke part 100 between two adjacent tooth parts 101 is provided with a concave groove 1001 which is concave towards the outer side of the stator core, the minimum thickness between the groove bottom wall of the concave groove 1001 and the outer peripheral wall of the stator core is L2, and L2 is not less than 0.75-L1, so that the yoke part magnetic density is prevented from being excessively saturated to influence the torque output of the motor. At this time, the diameter of the corresponding hinge point 3 is D3, D3 is larger than or equal to 1mm and is smaller than or equal to 0.5. L2, so that the hinge point is ensured to have higher hinge strength, and the magnetic field is prevented from being greatly influenced by the overlarge hinge point.

On the first projection plane, the projections of the concave grooves 1001 are a first straight line segment and a second straight line segment which are intersected, 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 winding post 1011 which is adjacent to the first straight line segment, 80 degrees < a3<100 degrees are formed between the first straight line segment and/or the second straight line segment and the circumferential side wall of the winding post 1011, so that high-speed winding of the stator core in a spreading state can be guaranteed.

The second splicing line further comprises a second splicing straight line section 42, one end, opposite to the outer side of the stator core, of the second splicing straight line section 42 is tangent to the second splicing arc line section 41, and one end, opposite to the inner side of the stator core, of the second splicing straight line section 42 is located on the tooth part boundary circle, so that the second splicing line is guaranteed not to invade the tooth part 101 (winding post 1011) integrally, and adverse effects of the splicing line on a magnetic circuit are reduced to the maximum extent. Furthermore, an included angle a2 is formed between the second splicing straight line segment 42 and the central symmetry line, an included angle a2 is 90 degrees to 180 degrees, the second splicing line is not beyond the tooth part 101, the connecting part of the tooth part and the yoke part on each punching sheet is not too narrow, and the structural strength of each punching sheet is guaranteed.

Similar to the second iron core punching sheet group 2, a 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-shaped line segment 51, and a curvature center of the first splicing arc-shaped line segment 51 coincides with a circle center of the hinge point 3. The first splicing line further comprises a first splicing straight line segment 52, one end of the first splicing straight line segment 52, which is opposite to the outer side of the stator core, is tangent to the first splicing arc line segment 51, one end of the first splicing straight line segment 52, which is opposite to the inner side of the stator core, is on the boundary circle of the teeth, and an included angle a1, 90 degrees < a1<180 degrees and a1< a2, is formed between the second splicing straight line segment 42 and the central symmetry line.

Furthermore, the combined stator core can also comprise a third core punching sheet group 6,

the third iron core punching sheet group 6 comprises 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 through the hinge point 3, the first yoke punching sheet 12 is connected with the third yoke punching sheet 62, the third tooth punching sheet 61 is connected with the first tooth punching sheet 11, under the action of external force, the first tooth punching sheet 11 and the third yoke punching sheet 62 can rotate around the hinge point 3, the third tooth punching sheet 61 rotates along with the first tooth punching sheet 11, the first yoke punching sheet 12 rotates along with the third yoke punching sheet 62, the third tooth punching sheet 61 and the second tooth punching sheet 21 are identical in structure, the third yoke punching sheet 62 and the second yoke punching sheet 22 are mirror images in structure, the first iron core punching sheet group 1 is positioned between the second iron core punching sheet group 2 and the third iron core punching sheet group 6. At this moment, the first iron core punching sheet group 1, the second iron core punching sheet group 2 and the third iron core punching sheet group 6 are arranged along the axial direction of the stator iron core according to a preset rule, because the third yoke punching sheet 62 and the second yoke punching sheet 22 are mirror images, the preset rule is that the second iron core punching sheet group 2 and the third iron core punching sheet group 6 are respectively positioned at two axial end faces of the first iron core punching sheet group 1, the processing error (shape and position) of each punching sheet at a hinge point 3 can be effectively offset, the stator iron core after combination is more reliably connected, and the contact of each punching sheet after lamination is more compact.

The first iron core punching sheet group 1, the second iron core punching sheet group 2 and the third iron core punching sheet group 6 can be stacked along the axial direction of the stator iron core in the group, the axial thickness t of each single punching sheet is less than or equal to 0.5mm, and the preferable punching sheet material is non-oriented cold-rolled electrical steel.

The hinge point 3 can be, for example, a circular boss on the upper stamped sheet and a circular groove (actually, the circular boss is a convex point punched at a preset position of the stamped sheet) on the lower stamped sheet, the circular boss is embedded in the circular groove to form a rotatable structure, when the diameter of the hinge point 3 is large enough, the corresponding convex point can be directly punched and sheared to form uniform through holes, and at the moment, the through holes can be riveted through non-magnetic rivets.

In order to verify and adopt the utility model discloses technical scheme combination formula stator core's actual effect, utility model people carried out experimental test to the motor efficiency of the motor that adopts it, the compressor 1000Hz internal noise that adopts it, and the result is shown with reference to figure 14, figure 15 respectively. As can be seen from fig. 14, the motor efficiency of the motor adopting the technical scheme of the utility model is obviously improved under the operating frequencies of 30Hz, 60Hz and 90 Hz; as can be seen from FIG. 15, the internal noise of the compressor at 1000Hz and 30Hz, 60Hz and 90Hz frequencies is significantly reduced.

According to the utility model discloses an embodiment still provides a motor, including stator core, stator core is foretell combination formula stator core.

According to the utility model discloses an embodiment still provides a compressor, including foretell motor.

According to the utility model discloses an embodiment still provides an air conditioner, including foretell compressor.

It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention. The above is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (16)

1. The combined stator core is characterized by comprising a first core punching sheet group (1) and a second core punching sheet group (2) which are axially arranged along the stator core, wherein the first core punching sheet group (1) comprises a plurality of spliced first tooth punching sheets (11) and first yoke punching sheets (12), the second core punching sheet group (2) comprises a plurality of spliced second tooth punching sheets (21) and second yoke punching sheets (22), the first tooth punching sheets (11) and the second yoke punching sheets (22) are connected through a hinge point (3), the first yoke punching sheets (12) are connected with the second yoke punching sheets (22), the second tooth punching sheets (21) are connected with the first tooth punching sheets (11), the stator core after hinge combination is provided with an annular yoke part (100) and a tooth part (101), and the stator core is arranged along the radial outward direction of the stator core, the annular yoke (100) has a yoke region corresponding to the tooth portion (101), and the hinge point (3) is disposed in the yoke region.

2. The stator core according to claim 1, wherein the diameter of the outer circle 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 located on a distribution circle, the diameter of the distribution circle is D2, a circle passing through the intersection of the tooth portion (101) and the annular yoke portion (100) is a tooth portion boundary circle, the diameter of the tooth portion boundary circle is D5, the distribution circle, the tooth portion boundary circle and the outer circle of the stator core are concentric, and D5 < D2 < D1.

3. Stator core according to claim 2, characterized in that the centre of the hinge point (3) is on the central symmetry line of the tooth (101).

4. The stator core according to claim 3, wherein a second splicing line between any two adjacent second tooth laminations (21) and second yoke laminations (22) in the second core lamination group (2) comprises a second splicing arc segment (41), a curvature center of the second splicing arc segment (41) coincides with a circle center of the hinge point (3), and a curvature radius of the second splicing arc segment (41) is D4/2, D2-D4/2 > D5.

5. The stator core according to claim 4, wherein the tooth (101) includes a winding post (1011), any plane perpendicular to the axial line of the stator core is a first projection plane, and the projection of the winding post (1011) on the first projection plane has a circumferential width of L1, D4 ≦ L1.

6. The stator core according to claim 5, characterized in that the annular yoke portion (100) between two adjacent teeth (101) has a recessed slot (1001) recessed toward the outside of the stator core in the radial direction of the stator core, and the minimum thickness between the slot bottom wall of the recessed slot (1001) and the outer peripheral wall of the stator core is L2, L2 ≧ 0.75-L1.

7. Stator core according to claim 6, characterized in that the diameter of the hinge point (3) is D3, 1 mm. ltoreq. D3. ltoreq.0.5-L2.

8. Stator core according to claim 6, characterized in that on the first projection plane, the recess slot (1001) is projected as intersecting first and second straight segments, which are mirror images of each other, and that the first and/or second straight segments form an angle a3 with the circumferential side wall of the winding leg (1011) immediately adjacent thereto, 80 ° < a3<100 °.

9. The stator core according to claim 4, wherein the second splicing line further comprises a second splicing straight line segment (42), the second splicing straight line segment (42) is tangent to the second splicing arc segment (41) relative to an outer end of the stator core, and the second splicing straight line segment (42) is on the tooth boundary circle relative to an inner end of the stator core.

10. The stator core according to claim 9, characterized in that the second segment (42) forms an angle a2 with the central symmetry line, 90 ° < a2<180 °.

11. The stator core according to claim 10, wherein a first splicing line between any two adjacent first tooth laminations (11) and first yoke laminations (12) in the first core lamination group (1) comprises a first splicing arc segment (51), and a curvature center of the first splicing arc segment (51) coincides with a circle center of the hinge point (3).

12. The stator core of claim 11, wherein the first splicing line further comprises a first splicing straight line segment (52), and the second splicing straight line segment (42) forms an included angle a1 with the central symmetry line, 90 ° < a1<180 ° and a1< a 2.

13. The stator core according to claim 1, further comprising a third core punch stack (6), the third iron core punching sheet group (6) comprises 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 through the hinge point (3), the first yoke punching sheet (12) is connected with the third yoke punching sheet (62), the third tooth punching sheet (61) is connected with the first tooth punching sheet (11), the third tooth punching sheet (61) and the second tooth punching sheet (21) are identical in structure, the third yoke punching sheet (62) and the second yoke punching sheet (22) are mirror images 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).

14. An electrical machine comprising a stator core, wherein the stator core is a composite stator core as claimed in any one of claims 1 to 13.

15. A compressor comprising an electric motor, wherein the electric motor is the electric motor of claim 14.

16. An air conditioner comprising a compressor, wherein said compressor is as recited in claim 15.

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