Stator lamination, stator core and electric machine

Abstract

This application relates to the field of motor technology and discloses a stator lamination, a stator core, and a motor. The stator lamination includes a lamination body and multiple lugs. The lamination body includes multiple first portions and multiple second portions distributed circumferentially, each first portion and each second portion corresponding to two magnetic poles in different magnetic pole pairs. The multiple lugs are respectively connected to the outer edges of the multiple first portions. Each lug and / or the first portion it is connected to has a through opening, which reduces the sum of the solid areas of the lug and the first portion it is connected to, so that the sum of the solid areas equals the solid area of ​​the second portion. The stator lamination, stator core, and motor provided by this application improve the magnetic circuit imbalance caused by the lugs and alleviate the electromagnetic vibration noise of the pole order generated by the motor.

Description

Technical Field

[0001] This application relates to the field of motor technology, specifically to a stator lamination, a stator core, and a motor. Background Technology

[0002] As the industry develops, the power density of motors used in new energy vehicles is increasing, which in turn raises the requirements for motor cooling, heat dissipation, vibration, and noise control. With the increase in power density, the cooling path has a greater impact on the magnetic circuit, and due to the impact on the magnetic circuit, the motor often suffers from electromagnetic noise problems.

[0003] Currently, stator laminations in motor stators are often assembled using lugs. However, when the number of lugs does not match the number of poles in the motor, magnetic circuit imbalance occurs, leading to electromagnetic vibration noise of varying pole number and order. Summary of the Invention

[0004] In view of this, this application provides a stator lamination, a stator core, and a motor, which improves the magnetic circuit imbalance caused by the lug and alleviates the electromagnetic vibration noise of the pole order generated by the motor.

[0005] Specifically, the embodiments of this application include the following technical solutions:

[0006] The first aspect of this application provides a stator lamination, the stator lamination including a lamination body and a plurality of lugs;

[0007] The lamination body includes a plurality of first parts and a plurality of second parts distributed circumferentially, wherein any first part and any second part are used to correspond to two magnetic poles in different magnetic pole pairs respectively;

[0008] The plurality of lugs are respectively connected to the outer edges of the plurality of first portions;

[0009] Each of the protruding lugs and / or the first part to which it is connected is provided with a through opening, the opening being used to reduce the sum of the solid areas of the protruding lugs and the first part to which they are connected, so that the sum of the solid areas is equal to the solid area of ​​the second part.

[0010] Optionally, the through opening includes a first opening spaced apart from each other and at least one second opening;

[0011] At least a portion of the first opening is located on the lug and is used to form a bolt mounting hole on the stator core;

[0012] The at least one second opening is located at the yoke of the lamination body and is used to form a coolant channel on the stator core.

[0013] Optionally, the center of the first opening is located on the outer edge of the first portion.

[0014] Optionally, the number of the second opening is one;

[0015] The second opening has a trapezoidal shape with an arc-shaped upper base, wherein the first opening is located on the concave side of the upper base;

[0016] Alternatively, the second opening may be elliptical in shape.

[0017] Optionally, the number of the second openings is at least two, and the at least two second openings are spaced apart in the circumferential direction of the lamination body;

[0018] At least one of the second openings is used to form a first coolant channel, the first cooling channel being used to cool the lug; and / or,

[0019] At least one of the second openings is used to form a second coolant channel for cooling the yoke of the stator core.

[0020] Optionally, at least one third opening is provided on the yoke of the second part, the at least one third opening is used to form a third coolant channel, the third cooling channel is used to cool the yoke of the stator core;

[0021] The center of the at least one third opening is located on the same arc as the center of the second opening that forms the second coolant channel, and the arc is parallel to the outer contour line of the lamination body.

[0022] Optionally, the through opening is arranged symmetrically, with the axis of symmetry passing through the center of the lug and the center of the lamination body.

[0023] Optionally, the plurality of through openings corresponding to the plurality of lugs are distributed at equal intervals along the circumference of the lamination body.

[0024] A second aspect of this application provides a stator core, including the stator laminations described above.

[0025] A third aspect of this application provides an electric motor, including the stator laminations described above, or including the stator core described above.

[0026] The beneficial effects of the technical solutions provided in this application include at least the following:

[0027] In the stator lamination, stator core, and motor provided in this application embodiment, the lamination body includes multiple first parts and multiple second parts. Each first part and each second part corresponds to a magnetic pole, and the magnetic poles corresponding to the first part and the second part belong to different magnetic pole pairs. The outer edge of the first part is connected to a lug, and a through opening is provided in the lug and / or the first part. This makes the sum of the solid area of ​​the first part and the solid area of ​​the lug equal to the solid area of ​​the second part. Consequently, the solid area through which the magnetic lines of force emitted by the magnetic pole corresponding to the first part pass on the first part and the lug is equal to the solid area through which the magnetic lines of force emitted by the magnetic pole corresponding to the second part pass on the second part. Therefore, it is ensured that the solid area through which each magnetic pole passes on the stator lamination is equal, that is, the magnetic flux of each magnetic pole is equal. This avoids the magnetic circuit imbalance between the first and second parts caused by the lug, reducing the probability of the motor generating electromagnetic vibration noise of pole order. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This paper shows a schematic diagram of the structure of a stator lamination provided in an embodiment of this application;

[0030] Figure 2 This paper shows a schematic diagram of another stator lamination provided in an embodiment of this application;

[0031] Figure 3 A schematic diagram of another stator lamination provided in an embodiment of this application is shown.

[0032] Figure label:

[0033] 1. Stamp body; 11. First part; 12. Second part; 121. Third opening;

[0034] 2. Protruding ear part;

[0035] 3. Through opening; 31. First opening; 32. Second opening.

[0036] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

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

[0038] As the industry develops, the power density of motors used in new energy vehicles is increasing, which in turn raises the requirements for motor cooling, heat dissipation, vibration, and noise control. With the increase in power density, the cooling path has a greater impact on the magnetic circuit, and due to the impact on the magnetic circuit, the motor often suffers from electromagnetic noise problems.

[0039] Currently, stator laminations in motor stators are often assembled using lugs. However, when the number of lugs does not match the number of poles in the motor, the areas of different parts of the stator laminations are unequal, with the area of ​​the lug-equipped parts being significantly larger than that of the parts without lugs. This results in the magnetic field lines emitted by the poles corresponding to the lug-equipped parts passing through a larger area, meaning the magnetic flux in the lug-equipped parts is greater than that in the parts without lugs. Consequently, magnetic circuit imbalances occur in different parts of the stator laminations, leading to electromagnetic vibration noise in the motor that affects the number of poles and order.

[0040] To address the aforementioned problems, embodiments of this application provide a stator lamination, such as... Figure 1 As shown, the stator lamination includes a lamination body 1 and a plurality of lugs 2; the lamination body 1 includes a plurality of first portions 11 and a plurality of second portions 12 distributed circumferentially, each first portion 11 and each second portion 12 being used to correspond to two magnetic poles in different magnetic pole pairs respectively; the plurality of lugs 2 are respectively connected to the outer edges of the plurality of first portions 11; wherein, each lug 2 and / or the first portion 11 to which it is connected is provided with a through opening 3, the through opening 3 being used to reduce the sum of the solid areas of the lug 2 and the first portion 11 to which it is connected, so that the sum of the solid areas is equal to the solid area of ​​the second portion 12.

[0041] It should be noted that the "solid area" in the embodiments of this application refers to the cross-sectional area of ​​the solid portion on the stator lamination. For example, the cross-sectional area can be found in [reference needed]. Figure 1-3 It can also be understood as the projected area of ​​the solid part of the stator lamination along the axial direction. The solid part refers to the part of the stator lamination excluding openings, through holes, through slots, etc.

[0042] In the stator lamination provided in the embodiments of this application, the lamination body includes a plurality of first parts 11 and a plurality of second parts 12, each of the first parts 11 and each of the second parts 12 corresponds to a magnetic pole, and the magnetic poles corresponding to the first parts 11 and the second parts 12 belong to different magnetic pole pairs. The first part 11 has a lug 2 connected to its outer edge, and a through opening 3 is provided in the lug 2 and / or the first part 11. This makes the sum of the solid area of ​​the first part 11 and the solid area of ​​the lug 2 equal to the solid area of ​​the second part 12. Consequently, the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the first part 11 pass through the first part 11 and the connected lug 2 is equal to the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the second part 12 pass through the second part 12. This ensures that the solid area through which each magnetic pole passes on the stator lamination is equal, that is, the magnetic flux of each magnetic pole is equal. Therefore, it avoids the situation where the magnetic circuit is unbalanced between the first part 11 and the second part 12 due to the lug 2, and reduces the probability of the motor generating electromagnetic vibration noise of the pole order.

[0043] It should be understood that stator laminations are usually ring-shaped, with each first part and each second part being fan-shaped. The central angle corresponding to the first part is α, and the central angle corresponding to the second part is also α. The central angles corresponding to the two parts are equal.

[0044] It should be noted that stator laminations are generally arranged around the outside of rotor laminations. Multiple pairs of magnetic poles are provided on the rotor laminations. Each pair of magnetic poles includes two magnetic poles arranged axially symmetrically about the diameter of the rotor lamination. The first part 11 and the second part 12 correspond to two magnetic poles in different magnetic pole pairs, respectively. For example, if a rotor lamination includes two magnetic pole pairs, one pair including a first and a second magnetic pole, and the other pair including a third and a fourth magnetic pole, then the first part and the second part can correspond to the first and third magnetic poles, or to the second and fourth magnetic poles, respectively.

[0045] like Figure 1As shown, since each first part 11 has a lug 2 connected to its outer edge, the area through which the magnetic pole corresponding to the first part 11 passes is the sum of the areas of the first part 11 and the lug 2, which is significantly larger than the area of ​​the second part 12. This means the magnetic flux of the magnetic pole corresponding to the first part 11 on the stator lamination is greater than the magnetic flux of the magnetic pole corresponding to the second part 12 on the stator lamination. Therefore, the magnetic flux on the stator lamination is not uniformly distributed, resulting in an unbalanced magnetic circuit between the first part 11 and the second part 12 on the stator lamination. When the magnetic circuit of the motor is unbalanced, an uneven magnetic field is generated inside the motor. This uneven magnetic field causes the rotor of the motor to experience uneven magnetic force during rotation, resulting in vibration. This vibration varies with the operating speed of the motor, forming noise of different frequencies. This is the vibration noise of the number of poles and the order of vibration in the motor. Both the vibration noise of the number of poles and the order of vibration can affect the normal operation of the motor, reduce its efficiency, and may even cause damage to the motor. Therefore, the design and manufacture of electric motors need to ensure magnetic circuit balance as much as possible to reduce vibration and noise generation.

[0046] In some embodiments of this application, such as Figures 1 to 3 As shown, the through opening 3 includes a first opening 31 and at least one second opening 32 spaced apart; at least a portion of the first opening 31 is located on the lug 2 and is used to form a bolt mounting hole on the stator core; at least one second opening 32 is located on the yoke of the lamination body 1 and is used to form a coolant channel on the stator core.

[0047] In the stator laminations provided in this embodiment, when multiple stator laminations are stacked axially to form a stator core, the first openings 31 on the multiple stator laminations are stacked sequentially to form a bolt mounting hole through which a bolt passes. The bolt passes through the bolt mounting hole to fix the multiple stator laminations. Furthermore, when multiple stator laminations are stacked axially, the second openings 32 on the multiple stator laminations are stacked sequentially to form a coolant channel through which coolant flows, used to cool the yoke or lug 2 of the stator laminations. Simultaneously, because the first openings 31 and second openings 32 are provided on the stator laminations, the sum of the solid areas of the lug 2 and the first part 11 connected to it is reduced, making the reduced sum of solid areas equal to the solid area of ​​the second part 12. In a uniform magnetic field, the sum of the magnetic flux of the first part 11 and the lug 2 is equal to the magnetic flux of the second part 12, thus avoiding the magnetic circuit imbalance between the first part 11 and the second part 12 caused by the lug 2.

[0048] Optionally, the size of the first opening 31 can be selected according to the size of the bolt, and the size of the second opening 32 can be determined according to the size of the first opening 31 and the size of the lug 2.

[0049] Alternatively, the sum of the opening areas of the first opening 31 and the second opening 32 can be determined based on the size of the lug 2, and the sizes of the first opening 31 and the second opening 32 can be selected and adjusted according to installation and cooling requirements.

[0050] It's important to note that during motor operation, electrical energy is converted into mechanical energy, but this process isn't 100% efficient; some electrical energy is converted into heat, which is why motors generate heat. If this heat isn't dissipated in time, the motor's temperature will gradually rise. Excessive heat can damage the motor's insulation materials, shortening its lifespan; in severe cases, it can cause motor components to burn out or even start a fire. Therefore, the stator needs to be cooled to ensure it operates within an ideal temperature range.

[0051] In some embodiments of this application, such as Figures 1 to 3 As shown, the center of the first opening 31 is located on the outer edge of the first part 11.

[0052] In the stator lamination provided in this embodiment, since the center of the first opening 31 is located on the outer edge of the first part 11, a portion of the first opening 31 is actually located on the lug 2 and the other portion is located on the first part 11. When multiple stator laminations are connected by bolts, a limiting force is directly applied to the first part 11 on the stator lamination, resulting in higher structural strength and better fixing effect. Furthermore, this arrangement can reduce the arrangement area of ​​the lug 2, thereby reducing the total volume of the stator lamination or stator core and saving arrangement space.

[0053] In some embodiments of this application, such as Figure 1 As shown, each through opening 3 includes a second opening 32; the opening shape of the second opening 32 is a trapezoidal shape with an arc-shaped upper base, wherein the first opening 31 is located on the concave side of the upper base; or, the opening shape of the second opening 32 is elliptical.

[0054] In the stator lamination provided in this application embodiment, the second opening 32 in the stator lamination is set as a trapezoidal shape with a recessed upper bottom, which has the following main advantages:

[0055] 1. More efficient cooling: This design allows the coolant to contact the stator more directly and over a larger area, improving cooling efficiency;

[0056] 2. Reduce coolant pressure on the stator: Due to the trapezoidal design with a recessed top, the coolant pressure on the stator can be dispersed, preventing the stator from being damaged by excessive pressure;

[0057] 3. More efficient air discharge: In a trapezoidal channel, because the bottom of the channel is wider, when the liquid flows in the channel, the gas in the coolant has a greater probability of rising to the upper part of the channel. Air tends to accumulate in the upper half of the channel, which is conducive to the discharge of air in the coolant and prevents air accumulation from affecting the cooling effect.

[0058] In some embodiments of this application, each through opening 3 includes at least two second openings 32, which are spaced apart in the circumferential direction of the lamination body 1; at least one second opening 32 is used to form a first coolant channel for cooling the lug 2; and / or, at least one second opening 32 is used to form a second coolant channel for cooling the yoke of the stator core.

[0059] In some embodiments, such as Figure 2 As shown, there are two second openings 32, located on the yoke of the first part 11 and spaced apart circumferentially along the lamination body 1. When multiple stator laminations are stacked, the first opening 31 is used to form bolt mounting holes, and the two second openings 32 are used to form two first coolant channels to cool the lug 2. Compared with the trapezoidal second opening 32 in the above embodiment, the processing difficulty is lower and it can meet the needs of mass production.

[0060] Optionally, the shape of the second opening 32 is selected from any one of a circle, ellipse, square, or rectangle. Those skilled in the art can select and adjust the shape of the second opening 32 according to cooling and processing requirements.

[0061] In some embodiments, such as Figure 3 As shown, there are three second openings 32. Two of the second openings 32 are located on either side of the first opening 31, forming a second coolant channel when multiple stator laminations are stacked, to cool the yoke of the stator core. The third second opening 32 is located between the two second openings 32 and spaced apart from the first opening 31, forming a first coolant channel when multiple stator laminations are stacked, to cool the lug 2. This arrangement, compared to the case where there is only one second opening 32, additionally forms a second cooling channel, increasing the area of ​​the coolant channel used to cool the yoke, thus resulting in a better cooling effect on the stator lamination yoke.

[0062] Optionally, the shapes of the second opening 32 forming the first coolant passage and the second opening 32 forming the second coolant passage are different, so as to more clearly and easily distinguish the functions of different cooling passages and prevent coolant injection errors. For example, the two second openings 32 are circular, and the second opening 32 located between the two second openings 32 is rectangular. The rectangular second opening 32 forms the first coolant passage, and the first coolant flows through this first coolant passage; the circular second opening 32 forms the second coolant passage, and the second coolant flows through this second coolant passage, the thermal conductivity of which is greater than that of the first coolant.

[0063] The shape of the second opening 32 can also be elliptical, polygonal, etc., and those skilled in the art can select and adjust the shape of the second opening 32 according to actual needs.

[0064] In some embodiments of this application, at least one third opening 121 is provided on the yoke of the second part 12. The at least one third opening 121 is used to form a third coolant channel, which is used to cool the yoke of the stator core. The center of the at least one third opening 121 and the center of the second opening 32 used to form the second coolant channel are located on the same arc line, and the arc line is parallel to the outer contour line of the lamination body 1.

[0065] To improve the cooling effect on the stator laminations, a third opening 121 is made on the yoke of the second part 12. When multiple stator laminations are stacked, the multiple third openings 121 form a third coolant channel, which together with the second coolant channel formed by the second opening 32 cools the yoke of the stator core. This increases the area of ​​the coolant channel used to cool the yoke, resulting in a better cooling effect on the stator lamination yoke.

[0066] In some embodiments, such as Figures 1 to 3 As shown, multiple third openings 121 are evenly distributed around the lamination body 1 to form multiple third coolant channels. This design allows more coolant to directly contact the stator, thereby improving cooling efficiency and maintaining the optimal operating temperature of the motor. Furthermore, setting multiple coolant channels ensures uniform temperature distribution throughout the stator, preventing local overheating. In addition, even if one coolant channel malfunctions, other coolant channels can continue to operate without affecting the overall cooling effect.

[0067] In some embodiments of this application, such as Figure 1-3 As shown, each through opening 3 is arranged symmetrically, with the axis of symmetry passing through the center of the lug 2 and the center of the lamination body 1. Exemplarily, the axis of symmetry is a diameter of the stator lamination.

[0068] This configuration ensures that the opening areas of the first opening 31 and the second opening 32 are equal on both sides of the axis of symmetry. That is, it ensures that the sum of the solid areas of the first part 11 and the lug 2 connected to it on both sides of the axis of symmetry is equal. In a uniform magnetic field, the magnetic flux of the first part 11 and the lug 2 connected to it on both sides of the axis of symmetry is equal, and there will be no difference in local magnetic flux, thus avoiding electromagnetic vibration noise due to magnetic circuit imbalance.

[0069] In some embodiments, such as Figure 1 As shown, the first opening 31 is an axisymmetric structure, and the trapezoidal second opening 32 is also an axisymmetric structure. Furthermore, the axes of symmetry of the two coincide, and the solid areas of the first part 11 and the lug 2 connected to it are equal on both sides of the axis of symmetry.

[0070] In some embodiments, such as Figure 2 As shown, the first opening 31 is an axisymmetric structure, and two circular second openings 32 are symmetrically arranged on both sides of the axis of symmetry of the first opening 31. The solid areas of the first part 11 and the lug 2 connected to it on both sides of the axis of symmetry are equal.

[0071] In some embodiments, such as Figure 3 As shown, the first opening 31 is an axisymmetric structure, two circular second openings 32 are symmetrically arranged on both sides of the axis of symmetry of the first opening 31, and a rectangular second opening 32 is located between the two second openings 32. The rectangular second opening 32 is an axisymmetric structure, and its axis of symmetry coincides with the axis of symmetry of the first opening 31. The solid areas of the first part 11 and the lug 2 connected to it on both sides of the axis of symmetry are equal.

[0072] In some embodiments of this application, multiple through openings 3 corresponding to multiple lugs 2 are distributed at equal intervals along the circumference of the lamination body 1.

[0073] In the stator core provided in this application embodiment, a plurality of lugs 2 are connected to the stator lamination. The plurality of lugs 2 are evenly distributed in the circumferential direction of the lamination body 1. A plurality of through openings 3 are respectively provided on the plurality of lugs 2 and the first part 11 connected thereto. The stator lamination can be fixedly connected at multiple positions through the plurality of lugs 2. At the same time, the yoke and / or lugs 2 of the stator core can be cooled, so that the temperature of the stator lamination is more uniform in all parts in the circumferential direction.

[0074] This application also provides a stator core, including the stator laminations described above.

[0075] In the stator core provided in the embodiments of this application, the lamination body includes a plurality of first parts 11 and a plurality of second parts 12, each of the first parts 11 and each of the second parts 12 corresponds to a magnetic pole, and the magnetic poles corresponding to the first parts 11 and the second parts 12 belong to different magnetic pole pairs. The first part 11 has a lug 2 connected to its outer edge, and a through opening 3 is provided in the lug 2 and / or the first part 11. This makes the sum of the solid area of ​​the first part 11 and the solid area of ​​the lug 2 equal to the solid area of ​​the second part 12. Consequently, the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the first part 11 pass through the first part 11 and the connected lug 2 is equal to the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the second part 12 pass through the second part 12. This ensures that the solid area through which each magnetic pole passes on the stator lamination is equal, that is, the magnetic flux of each magnetic pole is equal. Therefore, it avoids the situation where the magnetic circuit is unbalanced between the first part 11 and the second part 12 due to the lug 2, and reduces the probability of the motor generating electromagnetic vibration noise of the pole order.

[0076] Optionally, the stator core includes a plurality of stator laminations stacked sequentially, with the through openings of the plurality of stator laminations stacked sequentially to form a bolt mounting hole. A bolt passes through the bolt mounting hole, thereby fixing the plurality of stator laminations together.

[0077] This application also provides an electric motor, including the stator laminations described above, or including the stator core described above.

[0078] In the motor provided in the embodiments of this application, the lamination body includes a plurality of first parts 11 and a plurality of second parts 12, each of the first parts 11 and each of the second parts 12 corresponds to a magnetic pole, and the magnetic poles corresponding to the first parts 11 and the second parts 12 belong to different magnetic pole pairs. The first part 11 has a lug 2 connected to its outer edge, and a through opening 3 is provided in the lug 2 and / or the first part 11. This makes the sum of the solid area of ​​the first part 11 and the solid area of ​​the lug 2 equal to the solid area of ​​the second part 12. Consequently, the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the first part 11 pass through the first part 11 and the connected lug 2 is equal to the solid area through which the magnetic field lines emitted by the magnetic pole corresponding to the second part 12 pass through the second part 12. This ensures that the solid area through which each magnetic pole passes on the stator lamination is equal, that is, the magnetic flux of each magnetic pole is equal. Therefore, it avoids the situation where the magnetic circuit is unbalanced between the first part 11 and the second part 12 due to the lug 2, and reduces the probability of the motor generating electromagnetic vibration noise of the pole order.

[0079] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0080] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only.

[0081] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A stator lamination, characterized in that, The stator lamination includes a lamination body (1) and multiple lugs (2). The lamination body (1) includes a plurality of first parts (11) and a plurality of second parts (12) distributed along the circumferential direction, wherein any first part (11) and any second part (12) are used to correspond to two magnetic poles in different magnetic pole pairs respectively; The plurality of protruding ears (2) are respectively connected to the outer edges of the plurality of first portions (11); Each of the lugs (2) and / or the first part (11) to which it is connected is provided with a through opening (3), the through opening (3) being used to reduce the sum of the solid areas of the lugs (2) and the first part (11) to which they are connected, so that the sum of the solid areas is equal to the solid area of ​​the second part (12). The through opening (3) includes a first opening (31) and at least one second opening (32) spaced apart. At least a portion of the first opening (31) is located on the lug (2) and is used to form a bolt mounting hole on the stator core; The at least one second opening (32) is located at the yoke of the lamination body (1) and is used to form a coolant channel on the stator core.

2. The stator lamination according to claim 1, characterized in that, The center of the first opening (31) is located on the outer edge of the first part (11).

3. The stator lamination according to claim 1, characterized in that, The number of the second opening (32) is one; The second opening (32) has an opening shape that is a trapezoid with an arc-shaped upper bottom, wherein the first opening (31) is located on the concave side of the upper bottom; Alternatively, the second opening (32) may be elliptical in shape.

4. The stator lamination according to claim 1, characterized in that, The number of the second opening (32) is at least two, and the at least two second openings (32) are spaced apart in the circumferential direction of the lamination body (1); At least one of the second openings (32) is used to form a first coolant passage for cooling the lug (2); and / or, At least one of the second openings (32) is used to form a second coolant channel for cooling the yoke of the stator core.

5. The stator lamination according to claim 4, characterized in that, The second part (12) has at least one third opening (121) on its yoke, the at least one third opening (121) being used to form a third coolant channel, the third coolant channel being used to cool the yoke of the stator core; The center of the at least one third opening (121) is located on the same arc as the center of the second opening (32) that forms the second coolant channel, and the arc is parallel to the outer contour line of the lamination body (1).

6. The stator lamination according to any one of claims 1-5, characterized in that, The through opening (3) is arranged symmetrically, with the axis of symmetry passing through the center of the lug (2) and the center of the punch body (1).

7. The stator lamination according to any one of claims 1-5, characterized in that, The multiple through openings (3) corresponding to the multiple lugs (2) are distributed at equal intervals along the circumference of the lamination body (1).

8. A stator core, characterized in that, Includes the stator lamination as described in any one of claims 1 to 7.

9. An electric motor, characterized in that, It includes the stator laminations as described in any one of claims 1 to 7, or the stator core as described in claim 8.

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