Stator core and motor

Abstract

The utility model discloses a stator iron core and a motor, the stator iron core comprises a plurality of stator punching sheets which are sequentially arranged along the circumferential direction, the two ends of the stator punching sheets in the circumferential direction are respectively provided with a splicing block and a splicing groove, the stator punching sheets are at least provided with a stress hole, and the stress hole is provided with a plurality of stress holes. Every two adjacent stator punching sheets are spliced through the splicing block of one stator punching sheet and the splicing groove of the other stator punching sheet. According to the utility model, the splicing blocks and the splicing grooves are respectively arranged at the two ends of the stator punching sheet in the circumferential direction, so that the stator iron core is more convenient to splice, and the subsequent welding process is more convenient; meanwhile, the stress holes are arranged to absorb the stress of the hot jacket, the deformation degree of the stator core is reduced, and the deformation part of the stator can be guided to the stress holes to deform, so that the uniform deformation of the stator core is realized, and the iron loss amplification caused by the deformation of the stator core is further reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a stator core and a motor. Background Art

[0002] The traditional method of fixing the stator of a spliced ​​motor requires that the stator be spliced ​​into a circle first, and then welded at the joint of the two pieces. During this process, due to the limitations of the iron core processing accuracy and welding technology, the stator roundness may deviate, which will directly affect the working performance of the motor.

[0003] In a hermetic compressor, the motor stator is usually fixed by an interference fit process of shrink-fitting the housing. Although this fixing method can achieve a tight connection between the motor stator and the compressor housing, it also has some problems. First, the interference fit during the shrink-fit process will cause uneven deformation of the stator core. This deformation will cause hysteresis expansion in the main magnetic circuit, thereby increasing the magnetic resistance, causing the iron loss of the motor to increase significantly during operation, especially under high-frequency working conditions. The increase in iron loss is particularly significant. Secondly, uneven deformation may also cause the generation of unbalanced magnetic force, which will not only affect the operating efficiency of the motor, but may also cause the compressor noise to deteriorate and reduce the user experience. Utility Model Content

[0004] The utility model aims to provide a stator core and a motor, aiming to solve the problems of serious uneven deformation of the existing block-type stator core.

[0005] An embodiment of the utility model provides a stator core, comprising: a plurality of stator punching sheets arranged in sequence along the circumferential direction, wherein a splicing block and a splicing groove are respectively arranged at both ends of the stator punching sheet in the circumferential direction, at least one stress hole is arranged on the stator punching sheet, and two adjacent stator punching sheets are spliced ​​through the splicing block of one of the stator punching sheets and the splicing groove of the other stator punching sheet.

[0006] Furthermore, the stator punching sheet includes: a stator tooth portion and a stator yoke portion, the stator yoke portion is connected to the radial outer side of the stator tooth portion, the splicing block and the splicing groove are respectively arranged at two ends of the circumferential direction of the stator yoke portion, and the stress hole is arranged on the stator yoke portion.

[0007] Furthermore, the maximum radial width of the splicing block is W1, the radial width of the connection between the splicing block and the stator yoke is W2, and the radial width of the stator yoke is W3, satisfying: 0.35W3≤W2<W1≤0.6W3.

[0008] Furthermore, the splicing block includes a first splicing portion and a second splicing portion, the two circumferential ends of the first splicing portion are respectively connected to the stator yoke portion and the second splicing portion, the circumferential length of the first splicing portion is H1, the second splicing portion is arc-shaped, the radius of the second splicing portion is R3, the radial width of the connection between the splicing block and the stator yoke portion is W2, and the radial width of the stator yoke portion is W3, satisfying: 0.2W3

[0009] Furthermore, the radial distance between the circumferential center line of the splicing groove and the outer surface of the stator yoke is H2, the radial distance between the circumferential center line of the splicing groove and the inner surface of the stator yoke is H3, and the radial width of the stator yoke is W3, satisfying: 0.5H3≤H2<0.55H3 and H2+H3=W3.

[0010] Furthermore, the shapes and sizes of the splicing blocks and the splicing grooves match each other.

[0011] Furthermore, a plurality of the stress holes are provided, and the plurality of stress holes are symmetrical about a center line of the stator core.

[0012] Further, the stress hole includes: a first arc edge, a second arc edge, a third arc edge and a fourth arc edge, the first arc edge, the third arc edge, the second arc edge and the fourth arc edge are connected end to end in sequence, the first arc edge and the second arc edge are arranged opposite to each other in the radial direction, and the third arc edge and the fourth arc edge are arranged opposite to each other in the circumferential direction.

[0013] Furthermore, the centers of the first arc edge, the second arc edge, the stator outer circle of the stator core, and the stator inner circle of the stator core are the same.

[0014] Furthermore, the radial distance between the first arc edge and the stator outer circle of the stator core is D4, and the radial width of the stator yoke is W3, which satisfies: 0.075W3≤D4≤0.15W3.

[0015] Furthermore, the central angles of the third arc edge and the fourth arc edge are both 180°.

[0016] Furthermore, the radial width of the stress hole is D5, and the radial width of the stator yoke is W3, satisfying: 0.075W3≤D5≤0.15W3.

[0017] ​Furthermore, it also includes: a shrink-fit shell arranged on the radial outside of the stator punching sheet, the circumferential arc length of the stress hole is L1, the stator yoke includes a first yoke and a second yoke connected along the circumferential direction, and the arc length of the contact part of one of the first yoke or the second yoke with the shrink-fit shell is L2, satisfying: 0.9L2≤L1≤1.05L2.

[0018] Furthermore, the stress hole is a through hole that penetrates the entire stator punching sheet in the axial direction.

[0019] Furthermore, the radial outer side of the stator yoke is provided with flow grooves symmetrical with respect to the center line of the stator core.

[0020] Furthermore, the area enclosed by the circulation groove and the stator outer circle of the stator core is S1, and the area of ​​the stator outer circle is S2, satisfying: 1.5% S2≤S1≤2% S2.

[0021] Furthermore, a skeleton positioning groove is provided on the stator tooth portion, and the skeleton positioning groove is symmetrical about the center line of the stator core.

[0022] Furthermore, the circumferential length of the framework positioning groove is D3, and the circumferential length of the stator tooth portion is D1, satisfying: 0.2D1≤D3≤0.25D1.

[0023] Furthermore, at least one buckle point is provided on the stator punching sheet.

[0024] An embodiment of the utility model further provides a motor, comprising: the above-mentioned stator core.

[0025] The utility model discloses a stator core and a motor, wherein the stator core comprises: a plurality of stator punching sheets arranged in sequence along the circumferential direction, the two ends of the stator punching sheets are respectively provided with splicing blocks and splicing grooves, the stator punching sheets are provided with at least one stress hole, and two adjacent stator punching sheets are spliced ​​through the splicing blocks of one of the stator punching sheets and the splicing grooves of the other stator punching sheets. The utility model makes the assembly of the stator core more convenient by respectively providing splicing blocks and splicing grooves at the two ends of the stator punching sheets in the circumferential direction, and the subsequent welding process can also be more convenient; at the same time, the stress holes are provided to absorb the heat sleeve stress, thereby reducing the deformation degree of the stator core, and at the same time, the deformed part of the stator can be guided to deform at the stress holes, thereby realizing the uniform deformation of the stator core, thereby reducing the iron loss increase caused by the deformation of the stator core. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the structure when a single stator punching sheet is installed;

[0028] Figure 2 It is a schematic diagram of the structure of the stator punching sheet when the splicing block is of a special shape;

[0029] Figure 3 It is a structural schematic diagram of the stator core;

[0030] Figure 4 It is the magnetic force line distribution diagram of the stator punching;

[0031] Figure 5 for Figure 1 A partial map of

[0032] Figure 6 It is a structural schematic diagram of the stator punching sheet when the splicing block is an isosceles trapezoid;

[0033] Figure 7 It is a structural schematic diagram of the stator punching sheet when the splicing block is arc-shaped;

[0034] Figure 8 It is the structural schematic diagram of the stress hole;

[0035] Description of the markings in the figure:

[0036] 1. Stator punching sheet; 2. Splicing block; 3. Splicing groove; 4. Stress hole; 5. Stator tooth; 6. Stator yoke; 7. First splicing section; 8. Second splicing section; 9. Stator core center line; 10. First arc edge; 11. Second arc edge; 12. Third arc edge; 13. Fourth arc edge; 14. Stator outer circle; 15. Stator inner circle; 16. First yoke; 17. Second yoke; 18. Circulation groove; 19. Frame positioning groove; 20. Buckle point. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0038] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0039] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0040] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0041] See also Figure 1-3 This embodiment provides a stator core, including: a plurality of stator punching sheets 1 arranged in sequence along the circumferential direction, a splicing block 2 and a splicing slot 3 are respectively arranged at both ends of the stator punching sheet 1 in the circumferential direction, at least one stress hole 4 is arranged on the stator punching sheet 1, and two adjacent stator punching sheets 1 are spliced ​​through the splicing block 2 of one of the stator punching sheets 1 and the splicing slot 3 of the other stator punching sheet 1.

[0042] In this embodiment, by respectively arranging the splicing blocks 2 and the splicing grooves 3 at the two ends of the stator punching sheet 1 in the circumferential direction, the assembly of the stator core is more convenient, and the subsequent welding process can also be more convenient; at the same time, by arranging the stress hole 4 to absorb the heat sleeve stress, the deformation degree of the stator core is reduced, and at the same time, the deformed part of the stator can be guided to deform at the stress hole 4, thereby realizing uniform deformation of the stator core, and then reducing the increase in iron loss caused by the deformation of the stator core.

[0043] Specifically, the stator punching sheet 1 includes: a stator tooth portion 5 and a stator yoke portion 6, the stator yoke portion 6 is connected to the radial outer side of the stator tooth portion 5, the splicing block 2 and the splicing slot 3 are respectively arranged at two ends of the stator yoke portion 6 in the circumferential direction, and the stress hole 4 is arranged on the stator yoke portion 6.

[0044] In the stator core, the magnetic flux flows from the stator teeth 5 to the stator yoke 6, or from the stator yoke 6 to the stator teeth 5. Therefore, the magnetic flux distribution in the core of the stator yoke 6 is relatively dispersed, which may lead to large torque fluctuations. At the same time, the core saturation of the stator yoke 6 is much lower than that of the stator teeth 5, which means that the material of the stator yoke 6 is not fully utilized, thereby increasing the cost of the motor. Please refer to Figure 4The stress holes 4 are arranged on the stator yoke 6. On the one hand, they can avoid the area where the magnetic lines of force are densely distributed as much as possible to reduce the harmonic and saturation effects. On the other hand, they can guide the magnetic lines of force to be reasonably distributed in the stator yoke 6, thereby improving the power density of the stator core. At the same time, they can reduce the amount of silicon steel used in the stator core, reduce the weight of the motor, reduce the cost of the motor, and appropriately increase the saturation degree of the silicon steel of the stator yoke 6, thereby improving the material utilization rate.

[0045] Furthermore, the shapes and sizes of the splicing blocks 2 and the splicing grooves 3 match.

[0046] The matching of the shape and size of the splicing block 2 and the splicing groove 3 can ensure a high-precision connection during assembly. This high-precision connection helps to reduce gaps and misalignments, and improve the stability and reliability of the overall structure. The matching of shape and size makes the contact area between the splicing block 2 and the splicing groove 3 larger, thereby increasing the strength of the connection. This high-strength connection can withstand greater loads and impact forces, and improve the durability and safety of the structure.

[0047] In this embodiment, please refer to Figure 5 The maximum radial width of the splicing block 2 is W1, the radial width of the connection between the splicing block 2 and the stator yoke 6 is W2, and the radial width of the stator yoke 6 is W3, satisfying: 0.35W3≤W2<W1≤0.6W3.

[0048] By limiting the maximum radial width of the splicing block 2 to be larger than the radial width of the connection between the splicing block 2 and the stator yoke 6, the stator punching sheets 1 can only be connected by sliding along the axial direction, which simplifies the assembly process of the stator punching sheets 1 and enhances the overall stability of the stator to a certain extent.

[0049] It should be noted that the shapes of the splicing block 2 and the splicing groove 3 can be isosceles trapezoids (such as Figure 6 As shown), it can also be an arc (as shown Figure 7 As shown), it can also be a special shape (such as Figure 2 The shapes of the splicing block 2 and the splicing groove 3 can be selected accordingly according to the actual situation.

[0050] In some embodiments, the splicing block 2 includes a first splicing portion 7 and a second splicing portion 8 (eg, Figure 2 As shown), the two ends of the first splicing portion 7 in the circumferential direction are respectively connected to the stator yoke portion 6 and the second splicing portion 8, see Figure 5 The circumferential length of the first splicing portion 7 is H1, the second splicing portion 8 is arc-shaped, the radius of the second splicing portion 8 is R3, the radial width of the connection between the splicing block 2 and the stator yoke 6 is W2, and the radial width of the stator yoke 6 is W3, satisfying: 0.2W3

[0051] ​The limitation of the circumferential length of the first splicing portion 7 and the provision of the second splicing portion 8 can ensure the connection strength between the splicing slot 3 and the splicing block 2, and at the same time can ensure the mechanical strength of the stator core.

[0052] In this embodiment, the radial distance between the circumferential center line of the splicing groove 3 and the outer surface of the stator yoke 6 is H2, the radial distance between the circumferential center line of the splicing groove 3 and the inner surface of the stator yoke 6 is H3, and the radial width of the stator yoke 6 is W3, satisfying: 0.5H3≤H2<0.55H3 and H2+H3=W3.

[0053] The limitation on the radial distance between the circumferential center line of the splicing groove 3 and the outer surface of the stator yoke 6, and the radial distance between the circumferential center line of the splicing groove 3 and the inner surface of the stator yoke 6 is to ensure the reasonable opening position of the splicing groove 3 and the splicing block 2, so as to avoid that the splicing groove 3 and the splicing block 2 will not affect other parts of the stator punching sheet 1 after opening.

[0054] In this embodiment, a plurality of stress holes 4 are provided, and the plurality of stress holes 4 are symmetrical about the center line 9 of the stator core.

[0055] The symmetrically distributed stress holes 4 can ensure that the stator core is evenly stressed in all directions, maintaining the stability and balance of the structure. At the same time, the symmetrically distributed stress holes 4 can ensure that the deformation of the stator core is more uniform during shrink-fit fixation, thereby reducing the increase in iron loss caused by uneven deformation of the stator core, thereby improving the working efficiency of the motor.

[0056] In this embodiment, please refer to Figure 8 The stress hole 4 includes: a first arc edge 10, a second arc edge 11, a third arc edge 12 and a fourth arc edge 13, the first arc edge 10, the third arc edge 12, the second arc edge 11 and the fourth arc edge 13 are connected end to end in sequence, the first arc edge 10 and the second arc edge 11 are arranged opposite to each other in the radial direction, and the third arc edge 12 and the fourth arc edge 13 are arranged opposite to each other in the circumferential direction.

[0057] The arc-shaped stress hole 4 can better withstand forces and torques from all directions, and reduce deformation or damage caused by external forces.

[0058] Furthermore, the center of the first arc edge 10, the second arc edge 11, the stator outer circle 14 of the stator core and the stator inner circle 15 of the stator core are the same.

[0059] The same center of the first arc edge 10, the second arc edge 11, the stator outer circle 14 of the stator core and the stator inner circle 15 of the stator core means that the whole structure has a high degree of symmetry, which helps to ensure the stability and balance of the structure.

[0060] In this embodiment, please refer to Figure 5 The radial distance between the first arc edge 10 and the stator outer circle 14 of the stator core is D4, and the radial width of the stator yoke 6 is W3, which satisfies: 0.075W3≤D4≤0.15W3.

[0061] In order to enable the stress hole 4 to effectively absorb the accumulated pressure of the shrink-fit shell, the position of the stress hole 4 should be as close to the stator outer circle 14 as possible, so the radial distance D4 between the first arc edge 10 and the stator outer circle 14 of the stator core needs to satisfy: D4≤0.15W3; at the same time, it is necessary to ensure that the stator core part between the stress hole 4 and the stator outer circle 14 has sufficient mechanical strength to prevent breakage, so the radial distance D4 between the first arc edge 10 and the stator outer circle 14 of the stator core needs to satisfy: 0.075W3≤D4.

[0062] In this embodiment, the central angles of the third arc edge 12 and the fourth arc edge 13 are both 180°.

[0063] The semicircular structure can resist forces from all directions and reduce deformation or damage caused by external forces. At the same time, the central angle of 180° makes the processing of the third arc edge 12 and the fourth arc edge 13 relatively simple, thereby improving production efficiency.

[0064] In this embodiment, the radial width of the stress hole 4 is D5, and the radial width of the stator yoke 6 is W3, which satisfies: 0.075W3≤D5≤0.15W3.

[0065] In order to ensure that the stress hole 4 has enough space during the deformation process, thereby avoiding the stator yoke 6 from being squeezed due to insufficient deformation space of the stress hole 4, the radial width D5 of the stress hole 4 needs to satisfy: 0.075W3≤D5; but if the radial thickness of the stress hole 4 is too large, it will seriously affect the direction of the magnetic lines of force of the stator yoke 6, thereby causing the stator yoke 6 to be oversaturated, thereby increasing iron loss and reducing the efficiency of the motor, so the radial width D5 of the stress hole 4 needs to satisfy: D5≤0.15W3.

[0066] In this embodiment, the stator core further includes: a heat-shrinkable housing (not shown) arranged on the radial outer side of the stator punching sheet 1, the circumferential arc length of the stress hole 4 is L1, and the stator yoke 6 includes a first yoke 16 and a second yoke 17 connected along the circumferential direction (such as Figure 2 As shown), the arc length of the contact portion between one of the first yoke 16 or the second yoke 17 and the shrink-fit housing is L2, satisfying: 0.9L2≤L1≤1.05L2.

[0067] The setting of the circumferential arc length L1 of the stress hole 4 and the arc length L2 of the contact portion of one of the first yoke 16 or the second yoke 17 with the shrink-fit shell can make the stress hole 4 absorb the shrink-fit stress evenly to a large extent. At the same time, considering that the splicing block 2 or the splicing slot 3 on one side of the stress hole 4 and the flow slot 18 on the other side are not affected, the stator core parts on both sides of the stress hole 4 have a certain mechanical strength. Therefore, L1 should not be set too long, and it needs to meet the following requirements: 0.9L2≤L1≤1.05L2.

[0068] In some embodiments, the stress holes 4 may be arranged in sections (eg Figure 6 As shown), the segmented arrangement can improve the structural strength and rigidity of the stator punching sheet 1.

[0069] When the stress holes 4 are arranged in sections, the circumferential arc length L1 of the stress holes 4 is the maximum circumferential arc length distance between the two stress holes 4 that are farthest apart.

[0070] In this embodiment, the stress hole 4 is a through hole that penetrates the entire stator punching sheet 1 along the axial direction.

[0071] The design throughout the entire stator punching sheet 1 enables the stress hole 4 to uniformly absorb the shrinkage stress in the circumferential and axial directions, thereby more comprehensively alleviating the deformation degree of the stator core and reducing the increase in iron loss caused by the deformation of the stator core.

[0072] In this embodiment, please refer to Figure 2 The radial outer side of the stator yoke 6 is provided with flow grooves 18 symmetrical with respect to the center line 9 of the stator core.

[0073] The circulation groove 18 can increase the heat dissipation area of ​​the stator yoke 6, which is beneficial to the dissipation of heat. During the operation of the motor, the stator core and winding will generate heat. If the heat cannot be dissipated in time, the temperature of the motor will rise, affecting the performance and life of the motor. The existence of the circulation groove 18 can promote air convection inside and outside the stator, enhance the heat dissipation effect, and ensure that the motor operates within a better temperature range. Since the circulation groove 18 improves the heat dissipation conditions, the temperature rise of the stator core and winding will be relatively low when the motor is working continuously. This can not only improve the operating efficiency of the motor, but also extend the service life of the motor. The symmetrical design of the circulation groove 18 about the center line 9 of the stator core makes the stator structure more balanced, which is beneficial to reduce the vibration and noise generated by the motor during operation. At the same time, the symmetrical structure also helps to improve the dynamic performance and stability of the motor.

[0074] It should be noted that the flow groove 18 is not in contact with the shrink-fit shell, so it is not directly affected by the shrink-fit stress.

[0075] Furthermore, the area enclosed by the flow slot 18 and the stator outer circle 14 of the stator core is S1, and the area of ​​the stator outer circle 14 is S2, which satisfies: 1.5% S2≤S1≤2% S2.

[0076] During the long-term operation of the compressor, the motor may overheat. This high temperature state will affect the key parameters such as the resistance of the motor, resulting in a decrease in motor efficiency, and may even cause motor failure due to overheating. This embodiment provides a circulation groove 18 to increase the contact area between the refrigerant and the motor, thereby enhancing the cooling effect on the motor. In order to ensure that the circulation groove 18 can continuously provide sufficient cooling effect, the area of ​​the circulation groove 18 needs to be set relatively large, so the area S1 enclosed by the circulation groove 18 and the stator outer circle 14 of the stator core needs to satisfy: 1.5% S2 ≤ S1; at the same time, in order to avoid the circulation groove 18 area being too large, resulting in insufficient mechanical strength of the stator core and negative effects such as oversaturation of the magnetic flux density of the stator teeth 5 and the stator yoke 6, the area S1 enclosed by the circulation groove 18 and the stator outer circle 14 of the stator core should not be set too large, and it needs to satisfy: S1 ≤ 2% S2.

[0077] The radius of the stator outer circle 14 is R1 (as Figure 1 As shown), the area of ​​the stator outer circle 14 is S2 = πR1 2 .

[0078] In this embodiment, the stator teeth 5 are provided with a frame positioning groove 19 (such as Figure 2 As shown), the skeleton positioning groove 19 is symmetrical about the center line 9 of the stator core.

[0079] The frame positioning groove 19 provides a precise positioning point, making the frame installation more accurate and reliable. The symmetrical design helps to reduce electromagnetic noise and vibration caused by structural asymmetry. And the symmetrical design makes the stator more evenly stressed during operation, reducing the risk of damage caused by stress concentration.

[0080] Furthermore, the framework positioning groove 19 is located on the radial outer side of the stator tooth portion 5 and on the radial inner side of the flow groove 18. The framework positioning groove 19 is centrally arranged to facilitate identification and installation of the framework.

[0081] Furthermore, the circumferential length of the frame positioning groove 19 is D3, and the circumferential length of the stator tooth portion 5 is D1, which satisfies: 0.2D1≤D3≤0.25D1.

[0082] To facilitate the processing of the skeleton positioning groove 19, the skeleton positioning groove 19 needs to have a certain width, so the circumferential length D3 of the skeleton positioning groove 19 needs to satisfy: 0.2D1≤D3. At the same time, in order to avoid the skeleton positioning groove 19 from having a greater impact on the magnetic lines of force, it is necessary to limit the width of the skeleton positioning groove 19, so the circumferential length D3 of the skeleton positioning groove 19 needs to satisfy: D3≤0.25D1. In order to avoid the skeleton positioning groove 19 from having a greater impact on the magnetic lines of force, it is also necessary to limit the depth of the skeleton positioning groove 19. Therefore, the depth of the skeleton positioning groove 19 is in the range of 2-8mm. For example, the depth of the skeleton positioning groove 19 can be set to 5mm.

[0083] In this embodiment, at least one buckle point 20 (such as Figure 2 shown).

[0084] The setting of the buckle point 20 can weaken the magnetic field accumulation in the high magnetic density area, making the magnetic field distribution more uniform and closer to the ideal state.

[0085] Specifically, at least one buckling point 20 is disposed on each of the stator tooth portion 5 and the stator yoke portion 6 .

[0086] The buckle points 20 on the stator teeth 5 can effectively guide the magnetic lines of force so that they are more evenly distributed throughout the stator teeth 5. By providing the buckle points 20 on the stator yoke 6, the magnetic field strength in some areas can be weakened while the magnetic field strength in other areas can be enhanced, thereby making the magnetic field distribution of the entire stator yoke 6 more even.

[0087] This embodiment further provides a motor, comprising: the stator core of the above embodiment.

[0088] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part description. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

[0089] It should also be noted that, in this specification, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive.

[0090] Inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "including a..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

Claims

1. A stator core, characterized in that: include: A plurality of stator punching sheets are sequentially arranged along the circumferential direction, and splicing blocks and splicing grooves are respectively arranged at both ends of the stator punching sheet in the circumferential direction. At least one stress hole is arranged on the stator punching sheet, and two adjacent stator punching sheets are spliced ​​through the splicing block of one of the stator punching sheets and the splicing groove of the other stator punching sheet.

2. The stator core according to claim 1, characterized in that: The stator punching sheet comprises: a stator tooth portion and a stator yoke portion, wherein the stator yoke portion is connected to the radial outer side of the stator tooth portion, the splicing block and the splicing groove are respectively arranged at two ends of the stator yoke portion in the circumferential direction, and the stress hole is arranged on the stator yoke portion.

3. The stator core according to claim 2, characterized in that: The maximum radial width of the splicing block is W1, the radial width of the connection between the splicing block and the stator yoke is W2, and the radial width of the stator yoke is W3, satisfying: 0.35W3≤W2<W1≤0.6W3.

4. The stator core according to claim 2, characterized in that: The splicing block includes a first splicing portion and a second splicing portion, the two circumferential ends of the first splicing portion are respectively connected to the stator yoke portion and the second splicing portion, the circumferential length of the first splicing portion is H1, the second splicing portion is arc-shaped, the radius of the second splicing portion is R3, the radial width of the connection between the splicing block and the stator yoke portion is W2, and the radial width of the stator yoke portion is W3, satisfying: 0.2W3<H1<0.3W3 and 0≤2R3≤W2.

5. The stator core according to claim 2, characterized in that: The radial distance between the circumferential center line of the splicing groove and the outer surface of the stator yoke is H2, the radial distance between the circumferential center line of the splicing groove and the inner surface of the stator yoke is H3, and the radial width of the stator yoke is W3, satisfying: 0.5H3≤H2<0.55H3 and H2+H3=W3.

6. The stator core according to claim 1, characterized in that: The shapes and sizes of the splicing blocks and the splicing grooves match each other.

7. The stator core according to claim 2, characterized in that: A plurality of the stress holes are provided, and the plurality of stress holes are symmetrical about the center line of the stator core.

8. The stator core according to claim 2, characterized in that: The stress hole includes: a first arc edge, a second arc edge, a third arc edge and a fourth arc edge, the first arc edge, the third arc edge, the second arc edge and the fourth arc edge are connected end to end in sequence, the first arc edge and the second arc edge are arranged opposite to each other in a radial direction, and the third arc edge and the fourth arc edge are arranged opposite to each other in a circumferential direction.

9. The stator core according to claim 8, characterized in that: The center of the first arc edge, the second arc edge, the stator outer circle of the stator core, and the stator inner circle of the stator core are the same.

10. The stator core according to claim 8, characterized in that: The radial distance between the first arc edge and the stator outer circle of the stator core is D4, and the radial width of the stator yoke is W3, which satisfies: 0.075W3≤D4≤0.15W3.

11. The stator core according to claim 8, characterized in that: The central angles of the third arc side and the fourth arc side are both 180°.

12. The stator core according to claim 2, characterized in that: The radial width of the stress hole is D5, and the radial width of the stator yoke is W3, which satisfies: 0.075W3≤D5≤0.15W3.

13. The stator core according to claim 2, characterized in that: Also includes: A shrink-fit shell is arranged on the radial outer side of the stator punching sheet, the circumferential arc length of the stress hole is L1, the stator yoke includes a first yoke and a second yoke connected along the circumferential direction, and the arc length of the contact part of one of the first yoke or the second yoke with the shrink-fit shell is L2, satisfying: 0.9L2≤L1≤1.05L2.

14. The stator core according to claim 1, characterized in that: The stress hole is a through hole that penetrates the entire stator punching sheet in the axial direction.

15. The stator core according to claim 2, characterized in that: A flow groove symmetrical with respect to a center line of the stator core is arranged on the radial outer side of the stator yoke.

16. The stator core according to claim 15, characterized in that: The area enclosed by the flow groove and the stator outer circle of the stator core is S1, and the area of ​​the stator outer circle is S2, satisfying: 1.5% S2≤S1≤2% S2.

17. The stator core according to claim 2, characterized in that: The stator teeth are provided with skeleton positioning grooves, and the skeleton positioning grooves are symmetrical about the center line of the stator core.

18. The stator core according to claim 17, characterized in that: The circumferential length of the framework positioning groove is D3, and the circumferential length of the stator tooth portion is D1, satisfying: 0.2D1≤D3≤0.25D1.

19. The stator core according to claim 1, characterized in that: At least one buckle point is arranged on the stator punching sheet.

20. A motor, characterized in that: include: A stator core as claimed in any one of claims 1 to 19.

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