Combined stator core, motor, compressor, air conditioner

Abstract

The application provides a combined stator core, a motor, a compressor and an air conditioner, wherein the stator core comprises a first core lamination group and a second core lamination group arranged along the axial direction of the stator core, the first core lamination group comprises a plurality of spliced first laminations, the second core lamination group comprises a plurality of spliced second laminations, the first lamination and the second lamination are connected through a hinge joint, the hinge jointed combined stator core has a ring-shaped yoke portion and a tooth portion, along the radial outward direction of the stator core, the ring-shaped yoke portion has a yoke portion area corresponding to the tooth portion, and the hinge joint is arranged in the yoke portion area. The hinge joint of the lamination is arranged in the ring-shaped yoke portion area corresponding to the tooth portion, the structural strength of the hinge jointed combined stator core is improved, the influence on the magnetic circuit of the stator yoke portion is reduced, the coaxiality of the stator core is improved, the air gap magnetic field harmonic is reduced, the motor noise is reduced, and the motor efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of motor manufacturing technology, specifically relating to a combined stator core, motor, compressor, and air conditioner. Background Technology

[0002] Environmental protection and energy conservation are crucial issues for sustainable social development. With improved living standards, the prevalence of air conditioning has increased. Statistics show that air conditioning accounts for 20% of annual electricity consumption nationwide. As a vital component of air conditioning systems, the compressor consumes the largest proportion of energy; therefore, reducing losses and improving the efficiency of the compressor's motor are key issues. Further increasing the motor's slot fill factor helps reduce winding resistance, thereby reducing copper losses and improving motor efficiency.

[0003] For conventional circular stator cores using concentrated winding, the winding nozzle needs to be inserted into the stator slots during winding, thus occupying a portion of the slot area and limiting the slot fill factor. Currently, the industry typically uses segmented stator cores, where each core is wound and then spliced ​​into a circular core, eliminating the slot area occupied by the winding nozzle. However, the segmented core structure also has many problems, such as significant magnetic field loss at the splicing points, leading to a reduction in motor efficiency; low stiffness at the splicing points, worsening stator vibration and noise; poor coaxiality of the inner stator circle after splicing, increased harmonics in the air gap magnetic field, and further deterioration of motor vibration and noise. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to provide a combined stator core, motor, compressor, and air conditioner, in which the lamination hinge point is set in the annular yoke region corresponding to the tooth, thereby improving the structural strength of the hinged combined stator core, reducing the impact on the magnetic circuit of the stator yoke, improving the coaxiality of the stator core, reducing air gap magnetic field harmonics, reducing motor noise and improving motor efficiency.

[0005] To address the aforementioned problems, the present invention provides a composite stator core, comprising a first core lamination group and a second core lamination group arranged along the axial direction of the stator core. The first core lamination group includes multiple spliced ​​first laminations, and the second core lamination group includes multiple spliced ​​second laminations. The first laminations and the second laminations are connected by a hinge point. The stator core after hinge assembly has an annular yoke and a toothed portion. In the radially outward direction of the stator core, the annular yoke has a yoke region corresponding to the toothed portion, and the hinge point is disposed within the yoke region.

[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 and the annular yoke is the tooth boundary circle, 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.

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

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

[0009] Preferably, the toothed portion includes a winding post, and any plane perpendicular to the axis of the stator core is a first projection plane. 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 between two adjacent teeth has a recessed groove that is recessed toward the outside of the stator core, and the minimum thickness between the bottom wall of the recessed groove and the outer peripheral wall of the stator core is L2, where L2 ≥ 0.75·L1.

[0011] Preferably, the diameter of the hinge point is D3, where 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 a second straight line segment, the first straight line segment and the second straight line segment being mirror images of each other, and the first straight line segment and / or the second straight line segment forming an included angle α3, 80° with the circumferential sidewall of the adjacent winding post. <a3<100°。

[0013] Preferably, the second splicing line further includes a second splicing straight line segment, one end of which is tangent to the second splicing arc segment relative to the outer side of the stator core, and one end of which is located on the tooth boundary circle relative to the inner side of the stator core.

[0014] Preferably, the second splicing straight line segment forms an angle α1, 90° with the central symmetry line. <a1<180°。

[0015] Preferably, the first splicing line between any two adjacent first punching sheets 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.

[0016] Preferably, the first splicing line further includes a first splicing straight segment, and an included angle a2 is formed between the second splicing straight segment and the central symmetry line, 90° < a2 < 180° and a1 < a2.

[0017] Preferably, the first punching sheet has a first yoke partial body corresponding to the annular yoke portion and a first tooth portion, the first tooth portion and the first yoke partial body form an inverted 7 shape, the second punching sheet has a second yoke partial body corresponding to the annular yoke portion and a second tooth portion, the second tooth portion and the second yoke partial body form a 7 shape, and the first punching sheet and the second punching sheet are mirror images of each other.

[0018] The present invention also provides a motor, including a stator iron core, and the stator iron core is the above combined stator iron core.

[0019] The present invention also provides a compressor, including the above motor.

[0020] The present invention also provides an air conditioner, including the above compressor.

[0021] For a combined stator iron core, a motor, a compressor, and an air conditioner provided by the present invention, by arranging the hinge point in the yoke area corresponding to the tooth portion, the adverse influence on the magnetic circuit of the stator yoke due to the arrangement of the hinge point can be avoided to the greatest extent. At the same time, arranging the hinge point in this area can also improve the structural strength of the hinged combined stator iron core, specifically because this area 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 by 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

[0022] Figure 1 is a three-dimensional structural schematic diagram of the combined stator iron core according to an embodiment of the present invention;

[0023] Figure 2 is Figure 1 the structural schematic diagram of the first iron core punching sheet group in

[0024] Figure 3 is Figure 2 the structural schematic diagram of the first punching sheet in

[0025] Figure 4 is Figure 1A schematic diagram of the structure of the second core lamination group;

[0026] Figure 5 for Figure 4 A magnified view of the structure at point A in the diagram;

[0027] Figure 6 for Figure 4 A schematic diagram of the structure of the second lamination;

[0028] Figure 7 for Figure 2 A schematic diagram of the first iron core lamination group in its rotated and unfolded state;

[0029] Figure 8 for Figure 4 A schematic diagram of the second core lamination group in its rotated and unfolded state.

[0030] Figure 9 This invention provides a comparison of the motor efficiency of the motor employing the technical solution of this invention with that of motors in the prior art at different speeds (operating frequencies).

[0031] Figure 10 This paper compares the noise levels of the compressor using the technical solution of this invention with those of compressors in the prior art at different speeds (operating frequencies) within 1000Hz.

[0032] The reference numerals in the attached figures are as follows:

[0033] 1. First core lamination group; 11. First lamination; 2. Second core lamination group; 21. Second lamination; 3. Hinge point; 41. Second splicing arc segment; 42. Second splicing straight segment; 51. First splicing arc segment; 52. First splicing straight segment; 100. Annular yoke; 1001. Recessed groove; 101. Toothed part; 1011. Winding post. Detailed Implementation

[0034] See also Figures 1 to 10As shown, according to an embodiment of the present invention, a combined stator core is provided, including a first core lamination group 1 and a second core lamination group 2 arranged along the axial direction of the stator core. The first core lamination group 1 includes a plurality of spliced ​​first laminations 11, and the second core lamination group 2 includes a plurality of spliced ​​second laminations 21. The first laminations 11 and the second laminations 21 are connected by a hinge point 3. The stator core after hinge assembly has an annular yoke 100 and a toothed portion 101. In the radially outward direction of the stator core, the annular yoke 100 has a yoke region corresponding to the toothed portion 101, and the hinge point 3 is disposed in the yoke region. It is understandable that the first core lamination group 1 and the second core lamination group 2 are alternately arranged and stacked in the axial direction of the stator core to form the stator core. The formed stator core has the annular yoke 100 and the toothed portion 101 as a whole. The first lamination 11 has a first yoke portion 111 and a first toothed portion 112 corresponding to the annular yoke 100. The first toothed portion 112 and the first yoke portion 111 form a reverse 7-shape. The second lamination 21 has a second yoke portion 211 and a second toothed portion 212 corresponding to the annular yoke 100. The second toothed portion 212 and the second yoke portion 211 form a 7-shape. The first lamination 11 and the second lamination 21 are mirror images of each other. Specifically, the yoke region corresponding to the toothed portion 101 is as follows: Figure 2 , Figure 4 The corresponding area of ​​the annular yoke 100 corresponding to the tooth root of the winding post 1011 shown in the figure has a relatively small magnetic flux when there are magnetic lines of force in the stator core. Setting the hinge point 3 in this area can minimize the adverse effects of setting the hinge point on the magnetic circuit of the stator yoke. At the same time, setting the hinge point 3 in this area can also improve the structural strength of the hinged composite stator core. Specifically, this area can avoid the radial small size position of the yoke between the two teeth. When the stator core and the outer shell are assembled with an interference fit, the deformation of the stator core under stress will be smaller due to the improvement of structural strength. This is beneficial to improve the coaxiality of the stator core, reduce air gap magnetic field harmonics, reduce motor noise and improve motor efficiency.

[0035] 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 junction of the tooth 101 and the annular yoke 100 is the tooth boundary circle, 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, D5 < D2 < D1. In this case, the setting position of the hinge point 3 is limited to outside the tooth root position of the tooth 101, that is, it is completely on the annular yoke 100 without occupying the position of the tooth 101, preventing adverse effects on the magnetic circuit. Ideally, the center of the hinge point 3 is on the central symmetry line of the tooth 101, thereby making the laminations of the first core lamination group 1 and / or the second core lamination group 2 more replaceable, and also making the symmetry of the stator core structure after assembly better.

[0036] like Figure 4 As shown, the second splicing line between any two adjacent second laminations 21 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, where D2-D4 / 2>D5. The aforementioned second splicing line is essentially defined by the outer contour shape of the adjacent positions of the two second laminations 21. By defining the size relationship of D2, D4, and D5, the second splicing arc segment 41 can be prevented from encroaching on the position of the tooth 101, reducing the adverse effect of the splicing line gap on the magnetic flux. It can also be understood that the second splicing arc segment 41 ensures smooth hinge rotation and minimizes the splicing gap. Specifically, the toothed part 101 includes a winding post 1011, and any plane perpendicular to the axis of the stator core is the first projection plane. The circumferential width of the projection of the winding post 1011 on the first projection plane is L1, and D4≤L1.

[0037] In the radial direction of the stator core, the annular yoke 100 located between two adjacent teeth 101 has a recessed groove 1001 that is 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, where L2 ≥ 0.75·L1, to prevent the magnetic flux density of the yoke from becoming too saturated and affecting the motor torque output. At this time, the diameter of the corresponding hinge point 3 is D3, where 1mm ≤ D3 ≤ 0.5·L2, ensuring that the hinge point has high hinge strength while preventing the hinge point from being too large and causing a significant impact on the magnetic field.

[0038] 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, where 80° < a3 < 100°. This can ensure high-speed winding of the stator core in the unfolded state and improve production efficiency.

[0039] The second splicing line further includes a second splicing straight line segment 42. The outer end of the second splicing straight line segment 42 relative to the stator core is tangent to the second splicing arc segment 41. The inner end of the second splicing straight line segment 42 relative to the stator core is on the tooth boundary circle, so as to ensure that the entire second splicing line does not intrude into the tooth part 101 (winding column 1011), and minimize the adverse impact of the splicing line on the magnetic circuit to the greatest extent. Further, an included angle a1 is formed between the second splicing straight line segment 42 and the central symmetry line, where 90° < a1 < 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, ensuring the structural strength of each punching sheet.

[0040] Similar to the second iron core punching sheet group 2, the first splicing line between any two adjacent first punching sheets 11 in the first iron core punching sheet group 1 includes a first splicing arc segment 51. 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 line segment 52. The outer end of the first splicing straight line segment 52 relative to the stator core is tangent to the first splicing arc segment 51. The inner end of the first splicing straight line segment 52 relative to the stator core is on the tooth boundary circle. An included angle a2 is formed between the second splicing straight line segment 42 and the central symmetry line, where 90° < a2 < 180° and a1 < a2.

[0041] The first iron core punching sheet group 1 and the second iron core punching sheet group can be stacked axially along the stator core in multiple layers. The axial thickness t of each single punching sheet ≤ 0.5 mm. The preferred punching sheet material is non-oriented cold-rolled electrical steel.

[0042] The hinge point 3 can be, for example, a circular boss on the upper punching sheet and a circular groove on the lower punching sheet (actually both are convex points punched at the predetermined positions on the punching sheet). The circular boss 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.

[0043] To verify the practical effect of the combined stator core using the technical solution of this invention, the inventors conducted experimental tests on the motor efficiency of motors using it and the noise level of compressors using it within 1000Hz. The results are shown in [reference 1]. Figure 9 , Figure 10 As shown. By Figure 9 It is evident that the motor efficiency is significantly improved at operating frequencies of 30Hz, 60Hz, and 90Hz using the technical solution of this invention; Figure 10 It is evident that the noise level within 1000Hz is significantly reduced when the compressor operates at frequencies of 30Hz, 60Hz, and 90Hz using the technical solution of this invention.

[0044] According to an embodiment of the present invention, an electric motor is also provided, including a stator core, wherein the stator core is the aforementioned combined stator core.

[0045] According to an embodiment of the present invention, a compressor is also provided, including the motor described above.

[0046] According to an embodiment of the present invention, an air conditioner is also provided, including the compressor described above.

[0047] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A composite stator core, characterized in that, The stator core includes a first core lamination group (1) and a second core lamination group (2) arranged along the axial direction of the stator core. The first core lamination group (1) includes multiple spliced ​​first laminations (11), and the second core lamination group (2) includes multiple spliced ​​second laminations (21). The first laminations (11) and the second laminations (21) are connected by a hinge point (3). The stator core after hinge assembly has an annular yoke (100) and teeth (101). In the radial outward direction of the stator core, the annular yoke (100) has teeth (101) that correspond to the teeth (101). The corresponding yoke region, the hinge point (3) is set in 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 the distribution circle, the diameter of the distribution circle is D2, the circle passing through the junction of the tooth (101) and the annular yoke (100) is the tooth boundary circle, 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, D5 < D2 < D1; any two adjacent connected parts in the second core lamination group (2) The second splicing line between the second laminations (21) includes a second splicing arc segment (41), the curvature center of the second splicing arc segment (41) coincides with the center of the hinge point (3), and the curvature radius of the second splicing arc segment (41) is D4 / 2, D2-D4 / 2>D5; the tooth (101) includes a winding post (1011), any plane perpendicular to the axis of the stator core is the first projection plane, and the circumferential width of the projection of the winding post (1011) on the first projection plane is L1, D4≤L1; in the radial direction of the stator core The annular yoke (100) located between two adjacent teeth (101) has a recessed groove (1001) that is recessed toward 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, L2≥0.75·L1. The diameter of the hinge point (3) is D3, 1mm≤D3≤0.5·L2. The yoke regions corresponding to the annular yoke (100) of each of the first laminations (11) and the second laminations (21) are all located on one side of their respective teeth (101).

2. The stator core according to claim 1, characterized in that, The center of the hinge point (3) is located on the central symmetry line of the tooth (101).

3. The stator core according to claim 1, 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, which are mirror images of each other. The first straight line segment and / or the second straight line segment form an included angle α3, 80° with the circumferential sidewall of the adjacent winding post (1011). <a3<100°。 4. The stator core according to claim 2, 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.

5. The stator core according to claim 4, characterized in that, An included angle a1 is formed between the second splicing straight segment (42) and the central symmetry line, and 90° < a1 < 180°.

6. The stator core according to claim 5, characterized in that, The first splicing line between any two adjacent first punching sheets (11) 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).

7. The stator core according to claim 6, characterized in that, The first splicing line further includes a first splicing straight segment (52). An included angle a2 is formed between the second splicing straight segment (42) and the central symmetry line, 90° < a2 < 180° and a1 < a2.

8. The stator core according to claim 1, characterized in that, The first punching sheet (11) has a first yoke partial body (111) corresponding to the annular yoke portion (100) and a first tooth portion (112). The first tooth portion (112) and the first yoke partial body (111) form an inverted 7 shape. The second punching sheet (21) has a second yoke partial body (211) corresponding to the annular yoke portion (100) and a second tooth portion (212). The second tooth portion (212) and the second yoke partial body (211) form a 7 shape. The first punching sheet (11) and the second punching sheet (21) are mirror images of each other.

9. An electric motor, comprising a stator core, characterized in that, The stator core is the combined stator core according to any one of claims 1 to 8.

10. A compressor, comprising a motor, characterized in that, The motor is the motor according to claim 9.

11. An air conditioner, comprising a compressor, characterized in that, The compressor is the compressor according to claim 10.

Images