Silicon steel sheet and iron core assembly

Abstract

The invention discloses a silicon steel sheet and an iron core assembly, and belongs to the technical field of motor iron cores, the outer edge of the silicon steel sheet is provided with a plurality of welding notches, and the number of the welding notches is larger than or equal to 3; the width a mm of the welding notch and the outer diameter d mm of the silicon steel sheet meet the following condition: a = 0.015 d + 0.7; and the depth bmm of the welding notch and the outer diameter dmm of the silicon steel sheet meet the following condition: b = 0.0025 d-0. 05. The iron core assembly comprises 100N silicon steel sheets, N belongs to (1, 10), and all the silicon steel sheets are laminated and are welded and fixed into a whole through the welding notches. According to the invention, good structural stability after welding process molding can be ensured, modal characteristics of the molded iron core assembly can be reduced and improved, and the welding quality of the molded iron core assembly is improved by optimizing manufacturing parameter selection, so that the overall performance of the motor is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of motor cores, and in particular, relates to a silicon steel sheet and a core assembly. Background Art

[0002] The iron core assembly of the motor is the main magnetic circuit component in the motor. It is generally made of stacked silicon steel sheets, which are a material with high magnetic permeability and low hysteresis loss. As one of the core components of the motor, the performance and quality of the iron core assembly directly affect the overall operation of the motor. Most of the motor iron core assemblies on the market are made of hundreds of silicon steel sheets of equal thickness stacked and welded. Although this structure and manufacturing method guarantee the strength and stability of the iron core assembly to a certain extent, there are still some problems that need to be solved in practical applications.

[0003] The existing technology mainly forms the motor core assembly by annealing the raw material steel coil and the single silicon steel sheet after stamping. However, in the actual application of silicon steel sheets, although the welding process can connect the silicon steel sheets into a core assembly, the different designs of silicon steel sheets often lead to unstable welding quality, affecting the overall strength and mode of the core assembly. Therefore, determining the process parameters of silicon steel sheets is crucial to the quality of the core assembly. Summary of the invention

[0004] The present application aims to at least to some extent solve the technical problem of how to have better core assembly quality. To this end, the present application provides a silicon steel sheet and a core assembly, which improves the welding quality of the core assembly after forming by optimizing the manufacturing parameter selection, thereby improving the overall performance of the motor.

[0005] In a first aspect, an embodiment of the present application provides a silicon steel sheet, wherein a plurality of welding notches are provided on an outer edge of the silicon steel sheet, and the number of the welding notches is greater than or equal to 3;

[0006] The width amm of the welding notch and the outer diameter dmm of the silicon steel sheet satisfy: a=0.015d+0.7;

[0007] The depth bmm of the welding notch and the outer diameter dmm of the silicon steel sheet satisfy: b=0.0025d-0.05.

[0008] In some embodiments, the number n of the welding notches and the outer diameter dmm of the silicon steel sheet satisfy: n=0.1d-10.

[0009] In some embodiments, multiple welding notches are arranged circumferentially along the outer edge of the silicon steel sheet, and the multiple welding notches are symmetrically arranged, the central angles corresponding to each adjacent welding notch are equal, and the central angle θ corresponding to each adjacent welding notch is (12360 / d-25.8)°±5°.

[0010] In some embodiments, the silicon steel sheet is further provided with a plurality of overlapping positioning notches, which are arranged at equal intervals on the outer edge of the silicon steel sheet, and the overlapping positioning notches are used to be clamped and fixed with external positioning tooling.

[0011] In some embodiments, the silicon steel sheets are further provided with assembly positioning notches, which are provided at the outer edges of the silicon steel sheets, and are used to position the core assembly formed by stacking the silicon steel sheets.

[0012] In some embodiments, the size of the central angle θ corresponding to each adjacent welding notch is [15°, 60°].

[0013] In some embodiments, the thickness of the silicon steel sheet is [0.1 mm, 0.5 mm].

[0014] In some embodiments, the silicon steel sheet further includes a plurality of core slots, and the plurality of core slots are arranged at intervals on the inner edge of the silicon steel sheet.

[0015] In a second aspect, an embodiment of the present application provides an iron core assembly, which includes 100N silicon steel sheets as described above, N∈(1,10), and all the silicon steel sheets are stacked and fixed by welding through welding notches to form an integral body.

[0016] In some embodiments, in the core assembly, the number of welding notches of a single silicon steel sheet satisfies:

[0017] When the outer diameter of the silicon steel sheet is less than 200 mm, the number of welding notches is greater than or equal to 8;

[0018] When the outer diameter of the silicon steel sheet is greater than or equal to 200 mm and less than or equal to 220 mm, the number of welding notches is greater than or equal to 10.

[0019] It can be seen from the above technical solution that the beneficial effects of this application are:

[0020] 1. The silicon steel sheet of the present application ensures the reliability of the structure after welding by setting the number of welding notches, adopts welding notches designed to match the outer diameter, and reasonably controls the width and depth of the notches, which can fully consider the thermal physical properties of the material and the characteristics of the welding process, ensuring the stability of the welding structure and reducing unnecessary welding time and heat input; the width and depth of the welding notches matched with the outer diameter can fully consider the inherent vibration characteristics of the core assembly, optimize and improve the mode of the core assembly, ensure the stability of the core assembly, and reduce vibration and noise during use. In summary, the parameter design of the above-mentioned welding notches of the present application can ensure the welding process, have good structural stability after forming, and reduce the modal characteristics of the core assembly after forming. By optimizing the manufacturing parameter selection, the welding quality of the core assembly after forming is improved.

[0021] 2. The core assembly of the present application is made by welding loose silicon steel sheets into one body. By adopting specially designed silicon steel sheets and stacking and welding them into shape, the stability of the welding structure is ensured, and the modal characteristics of the core assembly are improved, vibration noise is reduced, and the welding quality of the core assembly after forming is improved, thereby improving the overall performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced one by one below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other embodiments and drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of an embodiment of the iron core assembly of the present invention is shown;

[0024] Figure 2 A schematic diagram of an embodiment of a silicon steel sheet of the present invention is shown;

[0025] Figure 3 A schematic diagram of an embodiment of the present invention showing the relationship between welding notch parameters and outer diameter;

[0026] Figure 4 A schematic diagram of an embodiment of the core assembly of the present invention during molding is shown;

[0027] Figure 5 A schematic diagram showing an embodiment of the relationship between the number of welding notches and the first-order natural frequency of the present invention is shown;

[0028] Figure numerals: 100, core assembly; 110, silicon steel sheet; 111, welding notch; 112, overlapping positioning notch; 113, assembly positioning notch; 114, core tooth groove; 200, tooling; 210, ring; 220, stop column; 221, protrusion. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0031] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0033] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0034] Please refer to Figure 1In the first aspect of the present application, a silicon steel sheet is provided. The silicon steel sheet 110 is a circular sheet structure. The silicon steel sheet 110 is relatively thin, with a thickness of [0.1mm, 0.5mm], such as 0.1mm, 0.25mm or 0.5mm. A plurality of welding notches 111 are provided on the outer edge of the silicon steel sheet 110. The number of the welding notches 111 is greater than or equal to 3, such as 3, 6, 10, etc. The welding notch 111 is an arc shape concave inwardly, or a square or other regular shape, and is formed by concavely setting inwardly along the outer edge of the silicon steel sheet 110. The width and depth of the welding notch 111 are respectively related to the outer diameter of the silicon steel sheet 110. The larger the outer diameter of the silicon steel sheet 110, the larger the width and depth of the welding notch 111. After the design of the motor is completed, the outer diameters of the core assembly 100 and the silicon steel sheet 110 are also determined, and then the width and depth of the welding notch 111 can be determined. The width amm of the welding notch 111 and the outer diameter dmm of the silicon steel sheet 110 satisfy: a=0.015d+0.7. For example, when the outer diameter is 190mm, the width of the welding notch 111 is 3.55mm. The depth bmm of the welding notch 111 and the outer diameter dmm of the silicon steel sheet 110 satisfy: b=0.0025d-0.05. For example, when the outer diameter is 190mm, the depth of the welding notch 111 is 0.425mm. For example, the width of the welding notch 111 is 5mm and the depth is 0.5mm. By setting the width and depth of the welding notch 111, an iron core assembly 100 having the same welding notch 111 can be formed, and multiple stacked silicon steel sheets 110 can be welded and fixed through the welding notch 111.

[0035] Although the silicon steel sheet 110 in the prior art may have a welding notch 111, the welding notch 111 is often not accurately calculated and optimized, resulting in iron loss problems in the silicon steel sheet 110 actually used when forming the core assembly 100. The silicon steel sheets 110 are stacked together, and the welding notches 111 on the outer circumference of each silicon steel sheet 110 are laser welded so that they are bonded and fixed together after being solidified by local high-temperature hot melt condensation. During the welding process, high temperature and thermal stress will be generated locally in the welding notch 111. Therefore, the welding notch 111 has a great influence on the welding process and the quality of the core assembly 100 after forming. On the one hand, it has an impact on the overall structural strength of the welding forming, and on the other hand, it also has an impact on the modal characteristics of the core assembly 100. The present application ensures the reliability of the structure after welding by setting the number of welding notches 111. The width and depth of the welding notches 111 have a certain relationship with the outer diameter of the silicon steel sheet 110. By setting the width and depth of the welding notches 111, an iron core assembly 100 with better specifications of the welding notches 111 is formed.

[0036] Specifically, the width and depth of the notch will affect the parameters of the weld, including the penetration depth, the weld width and the shape, and thus affect the strength and toughness of the weld. Generally speaking, a wider notch can provide a larger weld cross section, which is conducive to improving the strength of the weld, but an overly wide notch may increase the risk of welding deformation and residual stress, while a deeper notch may require a larger welding heat input to ensure the penetration of the weld, but excessive heat input may cause the weld to overheat, increase mechanical stress, and thus increase the risk of welding deformation. By adopting a welding notch 111 designed to match the outer diameter, the width and depth of the notch can be reasonably controlled, and the thermal physical properties of the material and the characteristics of the welding process can be fully considered, which can ensure the stability of the welding structure and reduce unnecessary welding time and heat input. On the other hand, the increase in the slot width reduces the mass of the core assembly 100, and has a relatively small effect on the stiffness, so the axial modal frequency increases less. The change in the slot width may affect the vibration form of the core assembly 100 at a specific frequency, that is, the modal shape. As the slot depth increases, the axial modal frequency of the core assembly 100 will be greatly reduced, but the increase in the slot depth has a greater impact on the stiffness. The slot depth may make the core assembly 100 more likely to deform when subjected to load or vibration, and affect the stability of the core assembly 100 mode, so the mode has an important impact on the running stability and vibration noise of the motor. Therefore, the width and depth setting of the welding slot 111 that matches the outer diameter can fully consider the inherent vibration characteristics of the core assembly 100, optimize and improve the mode of the core assembly 100, ensure the stability of the core assembly 100 in use, and reduce vibration and noise during use. In summary, the parameter design of the above-mentioned welding groove 111 of the present application can not only ensure the welding process and have good structural stability after forming, but also reduce the modal characteristics of the core assembly 100 after forming, and improve the welding quality of the core assembly 100 after forming by optimizing the manufacturing parameter selection.

[0037] Please refer to Figure 2In some embodiments, the number of welding notches 111 matches the outer diameter of the silicon steel sheet 110 and has a certain relationship. Specifically, the number n of welding notches 111 satisfies the outer diameter dmm of the silicon steel sheet 110: n=0.1d-10. For example, when the outer diameter is 190 mm, the number of welding notches 111 is 9. In the case of silicon steel sheets 110 of current specifications, the number of welding notches 111 is greater than or equal to 8, such as 12. Since the number of welding notches 111 also has a certain relationship with the first-order natural modal frequency of the formed core assembly 100, the number of welding notches 111 affects the modal frequency by affecting the mass of the core assembly 100 and affects the stress distribution inside the core assembly 100 through the welding notches 111, thereby affecting the modal frequency. Therefore, the number of notches needs to be optimized. It has been determined through experiments that the modal frequency increases with the increase in the number of notches. When the number of notches increases to a certain value, the modal frequency tends to be stable.

[0038] In some embodiments, a plurality of welding notches 111 are arranged in a circle along the outer edge of the silicon steel sheet 110, and the plurality of welding notches 111 are symmetrically arranged, and the central angles corresponding to the adjacent welding notches 111 are equal, and the central angles corresponding to the adjacent welding notches 111 are θ=(12360 / d-25.8)°±5°; that is, the plurality of welding notches 111 are arranged at the outer edge of the silicon steel sheet 110 to form a radiating point shape, and there is a corresponding central angle between the adjacent welding notches 111, and the size of the central angle is related to the outer diameter dmm of the silicon steel sheet 110. A certain relationship exists between the outer diameter of the silicon steel sheet 110 and the center angle. The larger the outer diameter of the silicon steel sheet 110, the more the number of welding notches 111, and the smaller the center angle. The size of the center angle is set by the number of welding notches 111, and matches the number of silicon steel sheets 110. In some embodiments, the size of the center angle θ corresponding to each adjacent welding notch 111 is [15°, 60°]. If the center angle is 15°, 30° or 60°, the center angle can take a value within a certain angle range. In order to consider the impact on welding quality and modal frequency, the center angle is preferably less than or equal to 36°. The above parameters of the welding notch 111, including width, depth, number, center angle, etc., all have a certain relationship with the outer diameter of the silicon steel sheet 110. The core assembly 100 formed using the above parameters is tested and compared under different outer diameters. The specific test results are shown in Tables 1 and Figure 3 :

[0039] Table 1 Relationship between welding notch parameters and outer diameter of core assembly

[0040] Serial number Outer diameter-mm Central angle -° Number of slots Slot width - mm Notch depth - mm 1 180 45 8 3.4 0.4 2 200 36 10 3.7 0.45 3 220 30 12 4 0.5 4 240 25.7 14 4.3 0.55 5 260 22.5 16 4.6 0.6

[0041] In some embodiments, the silicon steel sheet 110 is further provided with a plurality of overlapping positioning notches 112, and the size of each overlapping positioning notch 112 is designed to be equivalent to the welding notch 111, or the size is smaller than the welding notch 111. Generally, the depth of the overlapping positioning notch 112 is greater, such as the width of the notch is 4 mm and the depth is 2 mm. The plurality of overlapping positioning notches 112 are arranged at equal intervals on the outer edge of the silicon steel sheet 110, and the overlapping positioning notches 112 are formed by the outer edge of the silicon steel sheet 110 being recessed inwardly, and the shape of the notch is a regular shape, such as a square, a semicircle or other shapes. The plurality of overlapping positioning notches 112 of different silicon steel sheets 110 correspond to each other up and down, and the overlapping positioning notches 112 are used to be clamped and fixed with the external positioning tool 200, such as the external positioning tool 200 using a ring 210 and three retaining columns 2 20, three blocking columns 220 are connected to the outer edge of the ring 210 at intervals, the three blocking columns 220 are arranged in parallel, and the intervals between adjacent blocking columns 220 are equal, and the inner side of the blocking column 220 is provided with a protrusion 221 along the arrangement direction of the blocking column 220, and the protrusion 221 matches the stacking positioning groove 112. When in use, multiple silicon steel sheets 110 are placed opposite to the protrusion 221 through the stacking positioning groove 112, and the protrusion 221 is just stuck in the stacking positioning groove 112, and then placed on the ring 210 along the direction of the blocking column 220 to form multiple stacked silicon steel sheets 110, ensuring that all silicon steel sheets 110 are coaxial and the welding grooves 111 of the silicon steel sheets 110 are aligned, and then a force is applied to the core assembly 100, and finally fixed by welding through the welding grooves 111.

[0042] In some embodiments, the silicon steel sheet 110 is further provided with an assembly positioning notch 113, which is arranged at the outer edge of the silicon steel sheet 110. The assembly positioning notch 113 also plays a positioning role. The assembly positioning notch 113 is formed by the outer edge of the silicon steel sheet 110 being recessed inward. The notch can adopt a shape that is convenient for positioning, such as V-shape, square, trapezoidal, etc. The assembly positioning notch 113 is used to position the core assembly 100 formed by stacking the silicon steel sheets 110. One assembly positioning notch 113 is set on the silicon steel sheet 110, and the notch is a trapezoidal groove with a width of 5 mm and a depth of 2 mm. The use of the assembly positioning groove can facilitate positioning of the core assembly 100 in the motor housing when assembling it. In some embodiments, the silicon steel sheet 110 also includes a plurality of core slots 114. The core slots 114 are formed by the inner edge of the silicon steel sheet 110 being recessed inward and are rectangular slots. The plurality of core slots 114 are arranged at intervals on the inner edge of the silicon steel sheet 110. The core slots 114 are located on the inner side of the core assembly 100 for accommodating windings. The windings can be embedded in the core slots 114 to generate a magnetic field, thereby driving the motor to work.

[0043] Please refer to Figure 4In the second aspect of the present application, an embodiment provides a core assembly, which includes 100N silicon steel sheets 110 as described above, N∈(1,10), that is, the number of silicon steel sheets 110 is hundreds, and the thickness of each silicon steel sheet 110 is about 0.25 mm. After 100N silicon steel sheets 110 are stacked and assembled, they are fixed and formed to form a plurality of silicon steel sheets 110 of a certain thickness. All silicon steel sheets 110 are stacked and fixed by welding notches 111 to form a whole, and finally form a core assembly 100. According to the different designed thicknesses of the core assembly 100, the number of silicon steel sheets 110 used is also different. The core assembly 100 uses the above-mentioned silicon steel sheets 110, and the silicon steel sheets 110 are specially designed. By optimizing the manufacturing parameter selection of the silicon steel sheets 110, the modal characteristics of the core assembly 100 can be improved to ensure that it has good vibration characteristics and structural stability.

[0044] The core assembly 100 of the prior art is formed by stacking a large number of silicon steel sheets 110. The quality of the core assembly 100 after forming is greatly affected by the welding notch 111 and the welding process. First, it affects the welding quality of the core assembly 100, and second, it affects the modal characteristics of the core assembly 100. However, the present application welds the scattered silicon steel sheets 110 into one body. By using specially designed silicon steel sheets 110, after stacking and welding, it not only ensures the stability of the welding structure, but also improves the modal characteristics of the core assembly 100, reduces vibration noise, and improves the welding quality of the core assembly 100 after forming, thereby improving the overall performance of the motor.

[0045] In some embodiments, in the core assembly 100, the number of welding notches 111 of a single silicon steel sheet 110 satisfies:

[0046] When the outer diameter of the silicon steel sheet 110 is less than 200 mm, the number of the welding notches 111 is greater than or equal to 8;

[0047] When the outer diameter of the silicon steel sheet 110 is greater than or equal to 200 mm and less than or equal to 220 mm, the number of the welding notches 111 is greater than or equal to ten.

[0048] The number of welding notches 111 and the outer diameter of the silicon steel sheet 110 have a certain relationship. This is because the number of welding notches 111 is related to the first-order natural modal frequency of the formed core assembly 100. The number of notches needs to be optimized. It has been determined through experiments that the modal frequency increases with the increase in the number of notches. When the number of notches increases to a certain value, the modal frequency tends to be stable. Taking the modal test results of the core assembly 100 with a height of 120 mm and an outer diameter of 220 mm as an example, the relationship between the number of welding notches 111 of the core assembly 100 and the first-order natural frequency of the core assembly 100 is studied. Figure 5As shown in the curve, the series refers to the size conditions, such as the 200-120 series refers to the test conditions of the core assembly 100 with a height of 120mm at 200 degrees Celsius.

[0049] From the relationship between the number of welding notches 111 and the first-order natural frequency of the core assembly 100, it can be seen that as the number of welding notches 111 increases, the frequency of the core assembly 100 gradually increases, which means that the rigidity of the core assembly 100 is getting bigger and bigger, and the welding connection is more solid. When there are 10-12 welding points, the frequency tends to be stable. It is finally determined that for the core assembly 100 with an outer diameter of 220mm, the number of welding notches 111 is 12, and each welding notch 111 is symmetrically spaced 30° around the circumference. By analogy, the curve results of the outer diameters of 180mm and 200mm can be obtained. From this rule, it can be deduced that the number of welding slots for other stators less than 180mm and stators greater than 220mm can be seen in Table 1 above, the relationship between the welding notch parameters and the outer diameter of the core assembly.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", "optional example" or "optional implementation" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0051] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0052] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A silicon steel sheet, characterized in that: The outer edge of the silicon steel sheet (110) is provided with a plurality of welding notches (111), and the number of the welding notches (111) is greater than or equal to 3; The width amm of the welding notch (111) and the outer diameter dmm of the silicon steel sheet (110) satisfy the following relationship: a=0.015d+0.7; The depth bmm of the welding notch (111) and the outer diameter dmm of the silicon steel sheet (110) satisfy the following relationship: b=0.0025d-0.

05.

2. The silicon steel sheet according to claim 1, characterized in that: The number n of the welding notches (111) and the outer diameter dmm of the silicon steel sheet (110) satisfy the following relationship: n=0.1d-10.

3. The silicon steel sheet according to claim 2, characterized in that: The plurality of welding notches (111) are arranged in a circular pattern along the outer edge of the silicon steel sheet (110), and the plurality of welding notches (111) are symmetrically arranged, the central angles corresponding to the adjacent welding notches (111) are equal, and the central angles corresponding to the adjacent welding notches (111) are θ=(12360 / d-25.8)°±5°.

4. The silicon steel sheet according to any one of claims 1 to 3, characterized in that: The silicon steel sheet (110) is further provided with a plurality of overlapping positioning notches (112), the plurality of overlapping positioning notches (112) being arranged at equal intervals on the outer edge of the silicon steel sheet (110), the overlapping positioning notches (112) being used for being clamped and fixed with an external positioning tool (200).

5. The silicon steel sheet according to any one of claims 1 to 3, characterized in that: The silicon steel sheet (110) is also provided with an assembly positioning notch (113), wherein the assembly positioning notch (113) is provided at the outer edge of the silicon steel sheet (110), and the assembly positioning notch (113) is used to position the iron core assembly (100) formed by stacking the silicon steel sheets (110).

6. The silicon steel sheet according to claim 3, characterized in that: The size of the central angle θ corresponding to each adjacent welding notch (111) is [15°, 60°].

7. The silicon steel sheet according to any one of claims 1 to 3, characterized in that: The thickness of the silicon steel sheet (110) is [0.1 mm, 0.5 mm].

8. The silicon steel sheet according to any one of claims 1 to 3, characterized in that: The silicon steel sheet (110) further comprises a plurality of iron core tooth slots (114), wherein the plurality of iron core tooth slots (114) are arranged at intervals on the inner edge of the silicon steel sheet (110).

9. A core assembly, characterized in that: It comprises 100N silicon steel sheets (110) according to any one of claims 1 to 8, N∈(1,10), and all the silicon steel sheets (110) are stacked and fixed by welding through the welding notches (111) to form a whole.

10. The core assembly according to claim 9, characterized in that: In the iron core assembly (100), the number of the welding notches (111) of a single silicon steel sheet (110) satisfies: When the outer diameter of the silicon steel sheet (110) is less than 200 mm, the number of the welding notches (111) is greater than or equal to 8; When the outer diameter of the silicon steel sheet (110) is greater than or equal to 200 mm and less than or equal to 220 mm, the number of the welding notches (111) is greater than or equal to 10.

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