Stator core and motor

Abstract

The application provides a kind of stator core and motor.The stator core includes: first punching unit, the first punching unit includes first tooth part and first yoke part, one connecting joint is formed at the two ends of the first yoke part respectively, and the first punching unit is a symmetrical structure about the center line of the first tooth part;Second punching unit, the second punching unit includes second tooth part and second yoke part, and the second punching unit is a symmetrical structure about the center line of the second tooth part;Multiple first punching units and second punching units are arranged, multiple first punching units and second punching units are staggered and stacked, and two connecting joints axially adjacent can be rotatably connected to form a chain structure, and the chain structure is connected at the head to form the stator core.The application can reduce resonance and noise problems when the motor is running.

Description

Technical Field

[0001] This invention relates to the field of motor-related technologies, and in particular to a stator core and a motor. Background Technology

[0002] The existing keel-type stator core separates the traditional integral stator core into several stator core units. Each stator core unit includes a stator tooth and half of the stator yoke at each end. The stator core units are connected by concave-convex joints to realize a rotatable keel-type stator core.

[0003] Each stator core unit is formed by overlapping multiple stator core unit laminations and fastening them axially with three fastening points. Due to the asymmetrical arrangement of the core unit laminations about the tooth center, different stator core units are connected by concave and convex joints to form a stator core assembly. During the operation of the compressor, the stress on the yokes at both ends of each stator core unit is uneven. Under the action of electromagnetic force, solid-state mode resonance is very likely to occur, resulting in noise degradation. Summary of the Invention

[0004] In view of this, the present invention provides a stator core and a motor, which at least solves the technical problems of motor resonance and high noise in the prior art, specifically:

[0005] In a first aspect, the present invention provides a stator core, comprising:

[0006] The first lamination unit includes a first tooth and a first yoke. Each end of the first yoke has a rotating connection portion. The first lamination unit has a structure that is symmetrical about the center line of the first tooth.

[0007] The second lamination unit includes a second tooth and a second yoke, and the second lamination unit has a structure that is symmetrical about the center line of the second tooth.

[0008] Multiple first lamination units and multiple second lamination units are provided, and the multiple first lamination units and multiple second lamination units are stacked alternately. Two axially adjacent rotating connection parts are rotatably connected to form a chain structure. The chain structure is connected end to end to form the stator core.

[0009] Alternatively, the two ends of the first yoke form a first convex side line, which constitutes the outer side of the rotating connection, and the first side line includes a first arc segment and a first straight line segment.

[0010] Further optionally, a first recess is formed between the joint edge of the rotating connection and the first outer edge of the first yoke, and a second recess is formed between the joint edge and the first arc segment;

[0011] The first recess includes a planar segment and a first arcuate segment, and the second recess includes a second arcuate segment. The first arcuate segment and the second arcuate segment are symmetrical about the center line of the rotating connection.

[0012] Optionally, the rotating connection includes a joint connector, the joint connector having a groove structure on a first surface of the rotating connection and a protrusion structure on a second surface of the rotating connection.

[0013] The joint connector is located on the center line of the rotating connection.

[0014] Further optionally, the distance from the center of the joint connecting buckle to the end of the joint edge line is r, and the distance from the center of the joint connecting buckle to the intersection of the second arc segment and the first arc segment is R, where r≤R≤1.2r.

[0015] Alternatively, the center of the joint connector is located on the extension line of the edge of the planar segment.

[0016] Alternatively, the two ends of the second yoke form concave second edges.

[0017] The second sideline matches the first sideline.

[0018] Optionally, a straight segment of the second yoke is formed between the second outer edge of the second yoke and the second arc segment.

[0019] In the assembled state, the straight segment of the second yoke and the planar segment are symmetrically distributed about the center line of the joint.

[0020] Optionally, the first stamping unit is provided with a first fixing buckle, and the second stamping unit is provided with a second fixing buckle, and the first fixing buckle and the second fixing buckle can be connected by pressing.

[0021] Optionally, a snap-fit ​​structure is provided on the first stamping unit and the second stamping unit located at both ends of the chain structure, and the beginning and end of the chain structure are connected by the snap-fit ​​structure.

[0022] Secondly, the present invention provides an electric motor comprising the aforementioned stator core.

[0023] This invention sets both types of lamination units into a symmetrical structure about the tooth centerline, so that the stress on the yoke edge of the part of the lamination unit at both ends of the stator core through the concave-convex joint is evenly distributed, reducing the natural frequency of the overall compressor and effectively avoiding the resonance problem in the compressor's operating frequency range. Attached Figure Description

[0024] The above and other objects, features, and advantages of this disclosure will become more apparent from the detailed description of exemplary embodiments with reference to the accompanying drawings. The drawings described below are merely some embodiments of this disclosure, and those skilled in the art will be able to obtain other drawings based on these drawings without any inventive effort.

[0025] Figure 1 This diagram illustrates the assembly state of the first lamination unit and the second lamination unit according to an embodiment of the present invention.

[0026] Figure 2 This diagram shows the structure of the first lamination unit according to an embodiment of the present invention;

[0027] Figure 3 Show Figure 1 Enlarged view of point A in the middle;

[0028] Figure 4 This diagram illustrates the winding state of the first lamination unit and the second lamination unit in accordance with the present invention.

[0029] Figure 5 A schematic diagram of the axial cross-section of the stator core according to an embodiment of the present invention is shown;

[0030] Figure 6 A schematic diagram of the end face of the stator core according to an embodiment of the present invention (connected by the second lamination);

[0031] Figure 7 A schematic diagram of the end face of the stator core according to an embodiment of the present invention (connected by the first lamination);

[0032] Figure 8 This diagram shows a comparison between the noise value of the stator core in an embodiment of the present invention and the noise value of the original scheme.

[0033] In the picture:

[0034] 1. First punch unit; 11. First tooth; 12. First yoke; 121. First straight segment; 122. First arc segment; 123. First outer edge; 13. Connecting joint; 131. Joint edge; 132. First recess; 1321. First arc segment; 1322. Planar segment; 133. Second recess; 14. Joint connecting buckle; 15. First fixing buckle;

[0035] 2. Second lamination unit; 21. Second toothed part; 22. Second yoke part; 221. Second straight segment; 222. Second arc segment; 223. Second yoke straight segment; 224. Second outer edge line; 23. Second fixing buckle;

[0036] 3. Buckle structure. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] The terminology used in the embodiments of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms “a,” “the,” and “the” used in the embodiments of this invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. “Multiple” generally includes at least two, but does not exclude the inclusion of at least one.

[0039] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0040] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a product or system comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a product or system. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the product or system that includes said element.

[0041] This invention, by arranging both types of lamination units in a symmetrical structure about the tooth centerline, ensures a uniform stress distribution on the yoke edge of the portion of the stator core lamination unit at both ends through the concave-convex joint, reducing the natural frequency of the overall compressor and effectively avoiding resonance problems in the compressor's operating frequency range. The invention will be described in detail below with reference to specific embodiments:

[0042] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the present invention provides a stator core, comprising:

[0043] The first lamination unit 1 includes a first toothed portion 11 and a first yoke portion 12. Each end of the first yoke portion 12 forms a connecting joint 13. The first lamination unit 1 has a symmetrical structure about the center line of the first toothed portion 11.

[0044] The second lamination unit 2 includes a second toothed portion 21 and a second yoke portion 22. The second lamination unit 2 has a symmetrical structure about the center line of the second toothed portion 21.

[0045] Multiple first lamination units 1 and second lamination units 2 are provided, and the multiple first lamination units 1 and second lamination units 2 are staggered and stacked. Two adjacent connecting joints 13 in the axial direction are rotatably connected to form a chain structure. The chain structure is connected end to end to form the stator core. Specifically, in the axial direction, the first lamination units 1 and second lamination units 2 are stacked, that is, each first lamination unit 1 is overlapped with a second lamination unit 2; in the circumferential direction, the first lamination units 1 and second lamination units 2 are adjacent, that is, any first lamination unit 1 is adjacent to a second lamination unit 2.

[0046] like Figure 2 As shown, the two ends of the first yoke 12 form an outwardly convex first edge line, which includes a first straight line segment 121 and a first arc segment 122. The connecting joint 13 is formed on the inner side of the first edge line. Specifically, the connecting joint 13 is formed on the inner side of the first arc segment 122.

[0047] like Figure 2 , Figure 3 As shown, a first recess 132 is formed between the joint edge 131 of the connecting joint 13 and the first outer edge 123 of the first yoke 12. The first recess 132 connects to the joint edge 131 and the first outer edge 123. A second recess 133 is formed between the joint edge 131 and the first arc segment 122. The second recess 133 connects to the joint edge 131 and the first arc segment 122. The first recess 132 includes a planar segment 1322 and a first arc segment 1321. The second recess 133 includes a second arc segment. The first arc segment 1321 and the second arc segment are symmetrical about the centerline of the connecting joint 13. Preferably, the first arc segment 1321 and the second arc segment are multiple arc segments. The configuration of the first recess 132 and the second recess 133 provides clearance space when the chain structure rotates.

[0048] The connecting joint 13 includes a joint connecting buckle 14, which has a circular concave-convex structure. The joint connecting buckle 14 has a circular groove on the first surface of the connecting joint 13 and a circular protrusion on the second surface. The joint connecting buckle 14 is located on the center line of the connecting joint 13. Preferably, the joint connecting buckle 14 is formed on the connecting joint 13 by stamping. During assembly, the upper joint connecting buckle 14 is inserted into the lower joint connecting buckle 14, forming a rotatable connection.

[0049] like Figure 5 , Figure 6As shown, from a cross-sectional view, the first lamination unit 1 and the second lamination unit 2 on each laminated surface of the stator core alternately form the stator core cross-section. From an axial cross-section, the first lamination unit 1 and the second lamination unit 2 are alternately stacked. A rotational connection is achieved through a connecting joint 13, allowing the entire adjacent stator core unit to rotate around the joint, as shown... Figure 4 As shown, during winding, the first lamination 1 and the second lamination 2 can be rotated at a certain angle, increasing the distance between the first tooth 11 and the second tooth 21. This facilitates winding with the winding equipment and avoids interference during winding.

[0050] Furthermore, the first lamination unit 1 and the second lamination unit 2 arranged in this way have the same stress between each layer of laminations and between each lamination unit, so that the entire stator core after forming has obvious stiffness and less fixed frequency.

[0051] The formation of joint edge line 131, the first edge line, the second edge line, etc., directly affects the stiffness, stress-strain, and modal characteristics of the stator core unit and the entire stator core. During motor operation, electromagnetic force has the greatest impact on this part and its surroundings. Preferably, the distance from the center of the joint connecting buckle 14 to the end of the joint edge line 131 is r, and the distance from the center of the joint connecting buckle 14 to the intersection of the second arc segment and the first arc segment 122 is R, where r ≤ R ≤ 1.2r, thereby improving motor vibration. Figure 8 As shown, preferably, as the R dimension increases, the stiffness of the stator core unit first increases and then decreases. When R = 1.1r is satisfied, the total noise value within 1200HZ is relatively low, the motor noise is significantly reduced, and the overall effect is optimal.

[0052] Furthermore, the center of the joint connector 14 is located on the extended line of the edge of the planar segment 1322, which avoids the natural frequency of 1200Hz, resulting in a significant vibration reduction. In the original 1200Hz frequency band excitation structure, the third mode shape has most of its natural frequencies reduced under this invention, and the 1200Hz frequency rises to the fourth mode shape, eliminating resonance and greatly reducing motor vibration noise. Specific comparisons are shown in the table below.

[0053]

[0054] The two ends of the second yoke 22 form concave second side lines. The second side lines include a second arc segment 222 and a second straight segment 221. The second side lines have the same line shape as the first side lines. In the installed state, the first side lines and the second side lines can fit together completely, thereby avoiding or reducing the gap between adjacent first lamination unit 1 and second lamination unit 2.

[0055] A straight section 223 of the second yoke is formed between the second outer edge 224 of the second yoke 22 and the second arc segment 222. In the assembled state, the straight section 223 of the second yoke and the planar section 1322 are symmetrically distributed about the center line of the joint, which further balances the stress of each part and makes the structure more compact.

[0056] A first fixing buckle 15 is provided on the first stamping unit 1, and a second fixing buckle 23 is provided on the second stamping unit 2. The first fixing buckle 15 and the second fixing buckle 23 can be connected by pressing. Preferably, two first fixing buckles 15 are provided on the first yoke 12, and one first fixing buckle 15 is provided on the first toothed part 11. Similarly, two second fixing buckles 23 are provided on the second yoke 22, and one second fixing buckle 23 is provided on the second toothed part 21, thereby achieving a fixed connection at multiple positions and improving the connection reliability. Further, the first fixing buckle 15 and the second fixing buckle 23 have a concave-convex structure. Preferably, like the joint connecting buckle 14, they are formed on the first stamping unit 1 and the second stamping unit 2 by stamping, and the connection is achieved by pressing during assembly.

[0057] like Figure 6 , Figure 7 As shown, in this embodiment, a snap-fit ​​structure 3 is provided on the first stamping unit 1 and the second stamping unit 2 located at both ends of the chain structure, and the beginning and end of the chain structure are connected by the snap-fit ​​structure 3. The snap-fit ​​structure 3 preferably includes a protrusion formed on the first and second stamping units at the beginning of the chain structure, and a recess formed on the first and second stamping units at the end of the chain structure, with the protrusion embedded in the recess to form a snap-fit. Preferably, the protrusion and the recess are formed on the first yoke 12 and the second yoke 22. Alternatively, in other embodiments, the two ends of the chain structure can also be connected by welding.

[0058] The present invention also provides an electric motor including the above-described stator core, and further, the present invention also provides a compressor including the above-described electric motor.

[0059] This invention utilizes a symmetrical design of the stator core lamination units, ensuring that all stresses experienced by the compressor motor are uniform during operation. This results in a more compact structure and a significant reduction in the number of natural modal frequencies. Simultaneously, it mitigates motor resonance issues under electromagnetic excitation.

[0060] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A stator core, characterized in that, include: The first lamination unit includes a first tooth and a first yoke. Each end of the first yoke has a rotating connection portion. The first lamination unit has a structure that is symmetrical about the center line of the first tooth. The second lamination unit includes a second tooth and a second yoke, and the second lamination unit has a structure that is symmetrical about the center line of the second tooth. Multiple first lamination units and multiple second lamination units are provided; in the axial direction, multiple first lamination units and multiple second lamination units are staggered and stacked; In the circumferential direction, the first lamination unit and the second lamination unit are alternately arranged adjacently, and two adjacent rotating connecting parts are rotatably connected to form a chain structure. The chain structure is connected end to end to form the stator core. The first yoke has convex first side lines at both circumferential ends and a first outer side line at its radial outer end, wherein the first side line constitutes the outer side of the rotating connection. The first side line includes a first arc segment and a first straight segment, and the rotating connection is formed inside the first arc segment. A first recess is formed between the joint side line of the rotating connection and the first outer side line of the first yoke, and a second recess is formed between the joint side line and the first arc segment. The second yoke has concave second side lines at both ends, and the second side lines match the first side lines. The rotating connection part includes a joint connector buckle, which includes a groove structure on the first surface of the rotating connection part and a protrusion structure on the second surface of the rotating connection part. When each pair of adjacent rotating connection parts are in the assembled state, the protrusion structure of one joint connector buckle is embedded in the groove structure of the adjacent joint connector buckle. The joint connector is located on the center line of the rotating connection.

2. The stator core according to claim 1, characterized in that, The first recess includes a planar segment and a first arcuate segment, and the second recess includes a second arcuate segment. The first arcuate segment and the second arcuate segment are symmetrical about the centerline of the rotating connection.

3. The stator core according to claim 2, characterized in that, The second yoke has a concave second edge line at both circumferential ends and a second outer edge line at its radially outer end. The second edge line has the same line shape as the first edge line. The second edge line includes a second arc segment and a second straight line segment. A second straight line segment of the second yoke is formed between the second outer edge line of the second yoke and the second arc segment. In the assembled state, the straight segment of the second yoke and the planar segment are symmetrically distributed about the center line of the joint.

4. The stator core according to claim 2, characterized in that, The distance from the center of the joint connector buckle to the end of the joint edge line is r, and the distance from the center of the joint connector buckle to the intersection of the second arc segment and the first arc segment is R, where r≤R≤1.2r.

5. The stator core according to claim 2, characterized in that, The center of the joint connector is located on the extension line of the edge of the planar segment.

6. The stator core according to claim 1, characterized in that, The first stamping unit is provided with a first fixing buckle, and the second stamping unit is provided with a second fixing buckle. The first fixing buckle and the second fixing buckle can be connected by pressing.

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