Stator core, stator and electric machine

Abstract

The application relates to the technical field of arc extinguishing, in particular to a stator core, a stator and a motor. The stator core comprises a yoke, a plurality of stator teeth and a plurality of first arc extinguishing structures, wherein the yoke is in a circular ring structure; the first end of each stator tooth is connected with the inner circumferential wall of the yoke, the second end of each stator tooth is a free end, and the end face of the free end towards the axial direction of the yoke is a first end face; the first arc extinguishing structure is arranged on the first end face, and the first arc extinguishing structure comprises a first sharp end and a plurality of first grooves on both sides of the first sharp end. In this way, the first sharp end arranged on the first end face plays a role of collecting electricity, the plurality of first grooves on both sides of the first sharp end play a role of lengthening the electric arc, the electric arc can be guided to a position far away from the winding, the generation of the electric arc in the stator core is effectively inhibited, the insulation performance of the insulation material is prevented from being damaged, the heat dissipation area is increased, and the heat dissipation effect of the stator core is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of arc extinguishing, in particular to a stator core, a stator and a motor. BACKGROUND

[0002] Arc is a kind of gas discharge phenomenon, specifically refers to the high-temperature light discharge phenomenon caused by the self-sustaining conductive channel formed by the ionization of gas when the current passes through the insulating medium. During the operation of the motor, the local part of the stator core will form a penetrating arc. The insulating material will be pyrolyzed under the high-temperature action of the arc, forming a conductive carbon black channel, which will cause the insulating performance of the insulating material to decrease or even fail, and further cause the damage of the stator, reduce the structural life and increase the maintenance cost. SUMMARY

[0003] In order to overcome the problems in the related art, the present application provides a stator core, a stator and a motor, which can effectively suppress the generation of arc and save maintenance cost.

[0004] According to a first aspect of an embodiment of the present application, a stator core is provided, which comprises:

[0005] A yoke portion in a circular ring structure;

[0006] A plurality of stator teeth, a first end of each of the stator teeth is connected to an inner circumferential wall of the yoke portion, and a second end of each of the stator teeth is a free end, and an end face of the free end towards an axial direction of the yoke portion is a first end face;

[0007] A plurality of first arc extinguishing structures, the first arc extinguishing structures are arranged on the first end face, and the first arc extinguishing structures comprise a first sharp end and a plurality of first grooves located on both sides of the first sharp end.

[0008] In some embodiments of the present application, the first sharp end is located in the middle of the first end face, the first end face gradually moves away from the axial center of the stator core in the direction from the first sharp end to both side edges, a plurality of first grooves are arranged on the first end face on both sides of the first sharp end, and the first grooves and the first sharp end both extend in the axial direction of the stator core.

[0009] In some embodiments of the present application, the first grooves comprise rectangular grooves.

[0010] In some embodiments of the present application, the stator core further comprises at least one second arc extinguishing structure, two end faces of the yoke portion perpendicular to the axial direction thereof are two second end faces, the second arc extinguishing structure is arranged on at least one of the second end faces, and the second arc extinguishing structure comprises a second sharp end which is arranged protruding away from the yoke portion.

[0011] In some embodiments of the present application, the second arc-extinguishing structure comprises a mounting surface, a first inclined surface and a second inclined surface, the mounting surface is fixedly connected with the second end surface, the first inclined surface and the second inclined surface are connected to form the second tip, and the first inclined surface is arranged closer to the axis of the yoke than the second inclined surface.

[0012] In some embodiments of the present application, the second arc-extinguishing structure further comprises a third tip, and an end of the second inclined surface away from the axis of the yoke forms the third tip with the mounting surface.

[0013] In some embodiments of the present application, the second arc-extinguishing structure further comprises at least one second groove, and the second groove is arranged on the first inclined surface and / or the second inclined surface.

[0014] In some embodiments of the present application, the acute angle between the first inclined surface and the mounting surface is greater than the acute angle between the second inclined surface and the mounting surface, and a plurality of second grooves are arranged on the second inclined surface at intervals.

[0015] According to a second aspect of the embodiments of the present application, a stator is provided, which comprises the stator core as described in the first aspect.

[0016] According to a third aspect of the embodiments of the present application, an electric machine is provided, which comprises the stator as described in the second aspect.

[0017] The technical solutions provided by the embodiments of the present application can have the following beneficial effects:

[0018] The stator core provided by the present application has the following advantages: the winding is wound on the stator tooth, the first arc-extinguishing structure is arranged on the first end surface of the stator tooth, the first arc-extinguishing structure comprises a first tip and a plurality of first grooves arranged at both ends of the first tip, the first tip serves as a current collector, the first grooves can lengthen the electric arc and increase the resistance, thereby guiding the electric arc to a position away from the winding, avoiding damage to the insulation performance of the insulation material caused by the discharge of the electric arc at the winding position; in addition, the arrangement of the first tip and the first grooves also increases the heat dissipation effect of the stator core, improves the service life of the stator, and reduces the maintenance cost.

[0019] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0020] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the present application.

[0021] Figure 1is a structural diagram of a stator core according to an exemplary embodiment;

[0022] Figure 2 is a structural diagram of a first arc extinguishing structure according to an exemplary embodiment;

[0023] Figure 3 is a sectional view of a second arc extinguishing structure according to an exemplary embodiment;

[0024] Figure 4 is a sectional view of a second arc extinguishing structure according to another exemplary embodiment;

[0025] Figure 5 is a sectional view of a second arc extinguishing structure according to still another exemplary embodiment.

[0026] Reference Signs:

[0027] 100, yoke portion;

[0028] 200, stator tooth; 210, first end surface;

[0029] 300, first arc extinguishing structure; 310, first pointed end; 320, first recess;

[0030] 400, second arc extinguishing structure; 410, mounting surface; 420, first inclined surface; 430, second inclined surface; 440, second pointed end; 450, third pointed end; 460, second recess; 470, extension portion. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail with reference to the drawings, wherein like reference numerals refer to like elements throughout. The following detailed description is not to be taken in a limiting sense and is made in the light of the workings of the exemplary embodiments.

[0032] An arc is a gas discharge phenomenon, specifically, a high-temperature light discharge phenomenon in which a self-sustaining conduction path is formed due to gas ionization when an electric current passes through an insulating medium. Self-sustaining conduction refers to a state in which an electric current in a gas is self-maintained in a conductive state under the action of an electric field without relying on external ionization conditions. Specifically, when the voltage increases to a certain value, the electric current in the gas sharply increases, and even if the external ionization condition is removed, the conductive state is still maintained. This phenomenon is called gas self-sustaining conduction.

[0033] During the operation of the motor, the local part of the stator core will accumulate electric charge to form a through electric arc, especially in the stator core of a high-voltage motor (above 10 kv), the possibility of forming a through electric arc will be greater, and the winding of the stator includes an insulation layer, and the position where the winding contacts the stator tooth is also provided with an insulation material, and the insulation material will pyrolyze under the high temperature of the electric arc to form a conductive carbon black channel, which causes the insulation performance of the insulation material to decrease or even fail, and further causes the damage of the stator, thereby increasing the maintenance cost.

[0034] In order to solve the above technical problems, the application provides a stator core, by setting a first arc extinguishing structure on the first end face of the stator tooth, the first arc extinguishing structure includes a first sharp end and a plurality of first grooves located at both ends of the first sharp end, the first sharp end plays a role of collecting electricity, and the first grooves can lengthen the electric arc and increase the resistance, thereby guiding the electric arc to a position away from the winding, avoiding the damage of the insulation performance of the insulation material caused by the electric arc discharging at the winding position; in addition, the setting of the first sharp end and the first grooves increases the heat dissipation area of the stator core, thereby improving the heat dissipation effect of the stator core; the service life of the stator is improved, and the maintenance cost is reduced.

[0035] The application provides a stator core, a stator and a motor.

[0036] It should be noted that, Figure 1 The y-axis direction in the stator core is the axial direction of the yoke 100 and the axial direction of the stator core, that is, the direction of the axial center of the stator core; and Figures 2 to 5 The coordinate axis direction in the stator core is only used to describe the positional relationship of the structures, and can be the same as or different from the coordinate axis direction in the stator core. Figure 1

[0037] The application provides a stator core, as shown in Figure 1 and Figure 2 The stator core includes a yoke 100, a plurality of stator teeth 200 and a plurality of first arc extinguishing structures 300, wherein the yoke 100 is in a circular ring structure and includes an inner circumferential wall and an outer circumferential wall, the first end of each stator tooth 200 is connected to the inner circumferential wall of the yoke 100, the stator tooth 200 extends along the radial direction of the yoke 100, the second end of the stator tooth 200 is a free end, and the end face of the free end facing the axial center direction of the yoke 100 is a first end face 210; the interval between the adjacent two stator teeth 200 constitutes a slot required when the winding is wound on the stator tooth 200.

[0038] The first arc extinguishing structure 300 is arranged on the first end face 210, and the relationship between the first arc extinguishing structure 300 and the stator tooth 200 can be one-to-one (as shown in Figure 1 ​For example, as shown in FIG. 1, the first arc extinguishing structure 300 is arranged on each first end surface 210 of each stator tooth 200, i.e. one first arc extinguishing structure 300 is arranged on each first end surface 210 of each stator tooth 200; for another example, the first arc extinguishing structure 300 is arranged on the stator teeth 200 at intervals, i.e. among two adjacent stator teeth 200, only the first end surface 210 of one stator tooth 200 is provided with the first arc extinguishing structure 300, which is not limited herein. The first arc extinguishing structure 300 comprises a first tip 310 and a plurality of first grooves 320. As can be understood, the first tip 310 is arranged protrudingly relative to the first end surface 210, and the first grooves 320 are at least two in number, the number of the first grooves 320 arranged on the two sides of the first tip 310 can be equal or not equal. In the embodiment, as shown in FIG. 1, three first grooves 320 are arranged on the two sides of the first tip 310 respectively, in other embodiments, for example, two first grooves 320 are arranged on the two sides of the first tip 310 respectively, or six first grooves 320 are arranged on the two sides of the first tip 310 respectively, which are all within the protection scope of the present application. Figure 2

[0039] When the electric charge accumulation occurs in the interior of the stator core (herein, the interior refers to the position far away from the first end surface 210 of the stator core and the outer circumferential surface of the yoke 100 on the plane where the x-axis and the z-axis are located, i.e. the position where the winding is wound, the space between the adjacent stator teeth 200, hereinafter referred to as the slot), since the charge distribution on the surface of the conductor is closely related to the curvature, the curvature radius of the tip is extremely small, thus the charge density at the tip is much higher than that of the flat part, which leads to the significant enhancement of the electric field intensity near the tip, the high electric field makes the surrounding free charge be attracted to the tip position, thus the electric charge in the interior of the stator core can be concentrated to the position of the first tip 310; in the process of the electric charge concentration to the first tip 310, through the plurality of first grooves 320 on the two sides of the first tip 310, the arrangement of the first grooves 320 can increase the resistance, thereby playing the arc extinguishing role. Even if the electric charge is discharged when the electric charge accumulation at the first tip 310 exceeds a certain threshold, the insulation structure in the interior of the stator core will not be damaged.

[0040] In the embodiment, by arranging the first arc extinguishing structure 300 on the first end surface 210 of the stator tooth 200, the first arc extinguishing structure 300 comprises the first tip 310 and the plurality of first grooves 320 on the two ends of the first tip 310, the first tip 310 plays the role of collecting electric charge, and the first grooves 320 can lengthen the electric arc and increase the resistance, thereby guiding the electric arc to the position far away from the winding, avoiding the damage to the insulation performance of the insulation material caused by the discharge of the electric arc at the winding position; in addition, the arrangement of the first tip 310 and the first grooves 320 increases the heat dissipation area of the stator core, which is equivalent to increasing a plurality of air-cooled heat dissipation air ducts, thereby improving the heat dissipation effect of the stator core; improving the service life of the stator and reducing the maintenance cost.

[0041] In an embodiment, as shown in FIG. 1, the first arc extinguishing structure 300 is arranged on the first end surface 210 of each stator tooth 200, i.e. one first arc extinguishing structure 300 is arranged on each first end surface 210 of each stator tooth 200; for another example, the first arc extinguishing structure 300 is arranged on the stator teeth 200 at intervals, i.e. among two adjacent stator teeth 200, only the first end surface 210 of one stator tooth 200 is provided with the first arc extinguishing structure 300, which is not limited herein. The first arc extinguishing structure 300 comprises a first tip 310 and a plurality of first grooves 320. As can be understood, the first tip 310 is arranged protrudingly relative to the first end surface 210, and the first grooves 320 are at least two in number, the number of the first grooves 320 arranged on the two sides of the first tip 310 can be equal or not equal. In the embodiment, as shown in FIG. 1, three first grooves 320 are arranged on the two sides of the first tip 310 respectively, in other embodiments, for example, two first grooves 320 are arranged on the two sides of the first tip 310 respectively, or six first grooves 320 are arranged on the two sides of the first tip 310 respectively, which are all within the protection scope of the present application. Figure 2 ​As shown, in the x-axis direction, the first tip 310 is located in the middle of the first end surface 210, and the first end surface 210 gradually tilts away from the axial direction of the stator core in the direction from the first tip 310 to the edges of the first end surface 210 on both sides, that is, the first end surface 210 is composed of two inclined surfaces, the first tip 310 is located at the intersection of the two inclined surfaces, and a plurality of first grooves 320 are spaced apart on the first end surface 210 on both sides of the first tip 310. The first grooves 320 and the first tip 310 both extend in the axial direction of the stator core.

[0042] It should be noted that the spacing between adjacent two first grooves 320 can be equal or unequal; the arc extinguishing effect of the first grooves 320 is positively correlated with the number of the first grooves 320, that is, under the condition that the length of the inclined surface, the width of the first groove 320, the depth of the first groove 320, the spacing between adjacent two first grooves 320 and other parameters remain unchanged, the more the number of the first grooves, the better the arc extinguishing effect. The person skilled in the art can set the spacing and number of the first grooves 320 according to the actual situation, which will not be described here.

[0043] By setting the first end surface 210 to be composed of two inclined surfaces and the first tip 310 to be located in the middle, the moving path of the electric charge is lengthened, the resistance is increased, and the uniform distribution of the electric charge on both sides of the first tip 310 is also ensured, avoiding the difference in electric field strength caused by uneven amount of electric charge and improving the arc extinguishing effect.

[0044] In an embodiment, continuing to refer to Figure 2 , the shape of the first groove 320 is rectangular. The rectangular first groove 320 has a longer perimeter than a semicircular groove of the same size, which lengthens the moving path of the electric charge and further increases the resistance, thereby improving the arc extinguishing effect while facilitating processing.

[0045] In another embodiment, the shape of the first groove 320 is isosceles trapezoidal, and the longer base is located at the bottom of the first groove 320, that is, inside the stator tooth 200, further lengthening the moving path of the electric charge.

[0046] In an embodiment, referring to Figure 1 , a plurality of grooves are provided on the two end surfaces of the stator tooth 200 perpendicular to the y-axis direction to lengthen the moving path of the electric charge when it moves to the first tip 310, increase the resistance, and improve the arc extinguishing effect.

[0047] In an embodiment, as Figure 1 , Figures 3 to 5As shown, the stator core further comprises at least one second arc extinguishing structure 400, the two circular end faces of the yoke portion 100 which are perpendicular to the axial direction thereof are two second end faces, and the second arc extinguishing structure 400 is arranged on at least one second end face, that is, in the y-axis direction, the second arc extinguishing structure 400 can be arranged on one side of the yoke portion 100, or the second arc extinguishing structure 400 is arranged on both sides of the yoke portion 100; the second arc extinguishing structure 400 comprises a second pointed end 440 which is arranged protruding away from the yoke portion 100.

[0048] It can be understood that the second arc extinguishing structure 400 is made of an electrically conductive material, for example, is formed by stacking silicon steel sheets, or is made of an alloy material such as a ferrous nickel alloy or a ferrous cobalt alloy, or is made of a soft magnetic composite material; the material of the second arc extinguishing structure 400 can be the same as or different from the material of the stator core.

[0049] By arranging the second arc extinguishing structure 400 on at least one side of the yoke portion 100, the second arc extinguishing structure 400 comprises the second pointed end 440 which is arranged protruding away from the yoke portion 100, and the second pointed end 440 can guide the electric charge to a position away from the end portion of the winding (the position of the end portion of the winding is a portion protruding from the surface of the stator tooth 200 in the y-axis direction after the winding is wound on the stator tooth 200, which is referred to as a slot opening below), thereby avoiding the accumulation of electric charge at the end portion of the winding, and further avoiding the damage to the insulation performance of the insulation material caused by the formed through electric arc, and improving the service life of the stator.

[0050] In an embodiment, as shown in Figure 1 The second arc extinguishing structure 400 is fixed on the yoke portion 100 in a whole circular ring shape, and in another embodiment, the second arc extinguishing structure 400 can also be arranged in a segmented structure, and each segment is arranged in the circumferential direction of the yoke portion 100, which is within the protection scope of the present application.

[0051] In an embodiment, as shown in Figures 1 to 5 The second arc extinguishing structure 400 comprises a mounting surface 410, a first inclined surface 420 and a second inclined surface 430, the mounting surface 410 is fixedly connected with the second end face, for example, by welding, bonding or the like, but the welding material or the bonding material and the like need to be electrically conductive; the connection between the first inclined surface 420 and the second inclined surface 430 forms the second pointed end 440 which protrudes away from the yoke portion 100, that is, in the direction from the second pointed end 440 to both sides, the first inclined surface 420 and the second inclined surface 430 are both inclined toward the mounting surface 410, and the first inclined surface 420 is arranged closer to the axis of the yoke portion 100 than the second inclined surface 430.

[0052] In this way, the second arc extinguishing structure 400 can not only comprise multiple pointed ends for guiding electric charge, but also can reduce the volume and the occupation of space, and is also convenient for processing.

[0053] In an embodiment, as shown in Figures 1 to 5 The second arc-extinguishing structure 400 further comprises a third tip 450, and one end of the second slope 430 away from the axis of the yoke 100 and the mounting surface 410 form the third tip 450.

[0054] In this embodiment, by setting the third tip 450 at a position away from the axis of the yoke 100, the third tip 450 and the second tip 440 cooperate to guide the electric charge to a position away from the end winding, further improving the arc-extinguishing effect, avoiding the accumulation of electric charge at the end of the winding, and further avoiding the damage to the insulation performance of the insulation material caused by the formed through arc, and improving the service life of the stator.

[0055] In an embodiment, as shown in Figures 3 to 5 The second arc-extinguishing structure 400 further comprises at least one second groove 460, for example, only provided on the second slope 430 (as shown in Figure 3 and Figure 5 The second groove 460 can also be provided on the first slope 420 and the second slope 430 (as shown in Figure 4 The second groove 460 can also be only provided on the first slope 420; when the second arc-extinguishing structure 400 is circular, the corresponding second groove 460 is circular as a whole, and when the second arc-extinguishing structure 400 is a segmented structure, the corresponding second groove 460 is arc-shaped.

[0056] In this embodiment, by providing the second groove 460 on the first slope 420 and the second slope 430, the path of the electric charge moving to the second tip 440 and the third tip 450 is extended, further improving the arc-extinguishing effect.

[0057] In an embodiment, the second groove 460 has multiple setting modes in terms of the direction, shape and number. The second groove 460 on the second slope 430 can be provided in a direction perpendicular to the mounting surface 410 (as shown in Figure 3 The second groove 460 on the second slope 430 can also be provided in a direction perpendicular to the second slope 430 (as shown in Figure 5 Similarly, the second groove 460 provided on the first slope 420 can also be provided in a direction perpendicular to the mounting surface 410, and can also be provided in a direction perpendicular to the second slope 430 (as shown in Figure 4 The cross section of the second groove 460 can be rectangular, trapezoidal, etc. The number of the second groove 460 can be set based on the length of the slope and the amount of electric charge, etc. The number of the second groove 460 on the first slope 420 and the number of the second groove 460 on the second slope 430 can be equal or not equal.

[0058] According to different actual conditions, the opening direction, shape and number of the second grooves 460 are set, so that the arc extinguishing effect of the second arc extinguishing structure 400 in different motors and different working environments is ensured, and the application range of the stator core is expanded.

[0059] In an example embodiment, a plurality of third grooves are formed in the mounting surface 410, and the plurality of third grooves are arranged at intervals in the extension direction of the mounting surface 410. The possibility of arc generation is further reduced by the arrangement of the third grooves.

[0060] In some embodiments, as shown in Figure 5 The acute angle A between the first inclined surface 420 and the mounting surface 410 is greater than the acute angle B between the second inclined surface 430 and the mounting surface 410, that is, the second sharp end 440 is arranged closer to the axial direction of the yoke 100 in the x-axis direction, and the plurality of second grooves 460 are arranged at intervals on the second inclined surface 430.

[0061] In this way, the charges near the winding end are first collected on the second sharp end 440 which is close, and then gathered again on the third sharp end 450 after the arc drawing effect of the plurality of second grooves 460, so that the effect of collecting charges is ensured, and the arc extinguishing effect is ensured.

[0062] In an embodiment, continuing to refer to Figures 3 to 5 The position where the first inclined surface 420 and the mounting surface 410 are connected is provided with an extension 470, and the cross section of the extension 470 is rectangular, so that the winding and the insulating material are prevented from being damaged by the sharp end of the second arc extinguishing structure 400.

[0063] The process of arc extinguishing of the stator core in the above embodiment is as follows:

[0064] The arrangement of the first sharp end 310 guides the charges in the stator slot to the end of the stator tooth 200, and the charges pass through the plurality of first grooves 320 in the moving process, so that the increase of the path leads to the increase of the resistance, and the arc is reduced or even extinguished; at the same time, the arrangement of the second sharp end 440 and the third sharp end 450 guides the charges at the stator slot opening to the second arc extinguishing structure 400, and the charges pass through the arc drawing effect of the plurality of second grooves 460 in the moving process to the second sharp end 440 and the third sharp end 450, so that the arc at the slot and the slot opening is avoided, and the insulating performance of the insulating material is prevented from being damaged, so that the arc extinguishing effect is achieved.

[0065] In the present application, the insulating effect of the stator is protected by arranging the multi-stage arc extinguishing structure, compared with the arc extinguishing mode of arranging the metal partition plate in the related art, the occupation of the space in the slot is reduced, the winding fill factor is improved, and local overheating is not caused, so that the performance of the stator is greatly improved.

[0066] An exemplary embodiment of the present application provides a stator, which comprises a winding and the stator core in the above-mentioned embodiments, and the winding is wound on the stator teeth 200 of the stator core.

[0067] By arranging the first arc extinguishing structure 300 on the first end surface 210 of the stator teeth 200 and the second arc extinguishing structure 400 on at least one side of the yoke 100, the first arc extinguishing structure 300 comprises a first sharp end 310 and a plurality of first grooves 320 on both ends of the first sharp end 310, the first sharp end 310 plays a role of collecting electricity, and the first grooves 320 can elongate the arc, thereby guiding the arc to a position away from the slot; the second arc extinguishing structure 400 comprises a second sharp end 440, a third sharp end 450 and a plurality of second grooves 460, thereby guiding the arc to a position away from the slot opening winding, avoiding the damage of the arc generated in the slot and at the slot opening to the insulating material; in addition, the arrangement of the first arc extinguishing structure 300 and the second arc extinguishing structure 400 increases the heat dissipation area of the stator core, thereby increasing the heat dissipation effect of the stator core; the service life of the stator is improved, and the maintenance cost is reduced.

[0068] An exemplary embodiment of the present application provides an electric machine, which comprises the stator in the above-mentioned embodiments. By arranging the stator core with arc extinguishing effect, the insulation performance of the electric machine is ensured, the maintenance cost is reduced, the heat dissipation effect is improved, and the normal operation of the electric machine is ensured.

[0069] It should be noted that the terms "first", "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0070] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integrated; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0071] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples. In addition, the person skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples, without contradiction.

[0072] Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. It is intended that the present application cover any and all variations of the application that come within the scope of the present application, which is defined by the claims and their equivalents.

Claims

1. A stator core characterized by, The stator core comprises: a yoke (100) in a circular ring structure; a plurality of stator teeth (200), a first end of each of the stator teeth (200) is connected to an inner circumferential wall of the yoke (100), and a second end of each of the stator teeth (200) is a free end, and an end face of the free end in an axial direction of the yoke (100) is a first end face (210); a plurality of first arc extinguishing structures (300) are arranged on the first end face (210), and the first arc extinguishing structure (300) comprises a first pointed end (310) and a plurality of first grooves (320) on both sides of the first pointed end (310); the first pointed end (310) is located in the middle of the first end face (210), and the first end face (210) gradually moves away from the axis of the stator core in the direction from the first pointed end (310) to both side edges, and a plurality of first grooves (320) are arranged on the first end face (210) on both sides of the first pointed end (310) and spaced apart, and the first grooves (320) and the first pointed end (310) both extend in the axial direction of the stator core; the stator core further comprises at least one second arc extinguishing structure (400), two end faces of the yoke (100) perpendicular to the axial direction thereof are two second end faces, the second arc extinguishing structure (400) is arranged on at least one of the second end faces, and the second arc extinguishing structure (400) comprises a second pointed end (440) which is arranged in a protruding manner away from the yoke (100).

2. The stator core of claim 1, characterized in that, The first grooves (320) comprise rectangular grooves.

3. The stator core of claim 1, characterized by The second arc extinguishing structure (400) comprises a mounting face (410), a first inclined face (420) and a second inclined face (430), the mounting face (410) is fixedly connected to the second end face, the connection between the first inclined face (420) and the second inclined face (430) forms the second pointed end (440), and the first inclined face (420) is arranged closer to the axis of the yoke (100) than the second inclined face (430).

4. The stator core of claim 3, characterized in that, The second arc extinguishing structure (400) further comprises a third pointed end (450), and one end of the second inclined face (430) away from the axial direction of the yoke (100) forms the third pointed end (450) with the mounting face (410).

5. The stator core of claim 3, wherein The second arc extinguishing structure (400) further comprises at least one second groove (460), and the second groove (460) is arranged on the first inclined face (420) and / or the second inclined face (430).

6. The stator core of claim 5, characterized by An acute angle between the first inclined face (420) and the mounting face (410) is greater than an acute angle between the second inclined face (430) and the mounting face (410), and a plurality of second grooves (460) are arranged on the second inclined face (430) and spaced apart.

7. A stator characterized by, The stator comprises the stator core according to any one of claims 1-6.

8. An electric machine characterized by The motor comprises the stator according to claim 7.

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