Stator core, stator and motor

Abstract

The present invention discloses a stator core, a stator and a motor. The stator core comprises a core body, and a plurality of surface stator slots are arranged at intervals along the circumferential direction on the inner side of the core body, and at least part of the slot walls of the surface stator slots gradually expand from the inside to the outside in the axial direction of the core body to form a winding inclined surface. The stator core of the present application gradually expands from the inside to the outside in the axial direction of the core body through at least part of the slot walls of the surface stator slots on the inner side of the core body to form a winding inclined surface, so that the winding can be bent and shaped from the surface stator slots along the winding inclined surface. Compared with the stator designed by the traditional stator core, the designed stator has a shorter winding length at the stator end and a longer effective length, which can effectively reduce the magnetic leakage rate at the stator end and improve the motor performance.

Description

Technical Field

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

[0002] With the increasing demand for motor performance, the design requirements for motor stators have become more stringent. Currently, many motors use a double-layer stacked winding solution, and the stator slots used to install the windings are straight along the axial direction of the stator core. In order to meet the number of poles and efficiency of the motor, the ends of the windings are generally widened. As a result, when the windings are shaped during installation, many parts of the end windings need to be bent, making the length of the end windings account for about 3 / 4 of the length of the core. The length of the stator end windings is relatively long, while the actual effective length of the end windings is only about half of the length of the bent part, resulting in a high leakage rate at the stator ends, causing problems such as reduced motor performance and short life. Summary of the invention

[0003] The embodiments of the present invention provide a stator core, a stator and a motor, which solve the problem that the end winding length of the existing stator core is too long, resulting in a high magnetic leakage rate of the motor stator.

[0004] In a first aspect, an embodiment of the present invention provides a stator core, comprising:

[0005] The core body has a plurality of surface stator slots spaced apart from each other along the circumferential direction on the inner side thereof, and at least a part of the slot walls of the surface stator slots gradually expands from the inside to the outside in the axial direction of the core body to form a winding inclined surface.

[0006] In the stator core provided by the embodiment of the present invention, the surface stator slot includes a first slot wall and a second slot wall opposite to each other in the tangential direction of the core body, and at least one of the first slot wall and the second slot wall is formed with the winding inclined surface.

[0007] In the stator core provided in an embodiment of the present invention, the surface stator slot also includes an arc-shaped slot wall radially away from the axis of the core body, and both ends of the arc-shaped slot wall are respectively connected to the first slot wall and the second slot wall, wherein the arc-shaped slot wall forms the winding slope.

[0008] In the stator core provided by the embodiment of the present invention, the inclination angle of the winding inclined surface relative to the radial direction of the core body is θ, wherein 40°≤θ≤50°.

[0009] In the stator core provided in an embodiment of the present invention, the core body includes a first core portion and a second core portion, the inner side of the first core portion is provided with a plurality of internal stator slots spaced apart along the circumferential direction, the surface stator slots are spaced apart along the circumferential direction of the inner side of the second core portion, the surface stator slots overlap and are aligned with the internal stator slots, and the second core portion is provided on at least one side of the first core portion in the axial direction.

[0010] In the stator core provided in an embodiment of the present invention, the second core portion includes a plurality of stator punching sheets, and a plurality of punching sheet stator slots are distributed circumferentially on the inner side of each of the stator punching sheets, and the plurality of stator punching sheets are overlapped along the axial direction of the second core portion, and in the axial direction of the second core portion, the slot widths of the punching sheet stator slots of the plurality of stator punching sheets increase successively in the direction away from the first core portion.

[0011] In the stator core provided in the embodiment of the present invention, the distance between two opposite ends of the core body in the axial direction is L, and the distance between two opposite ends of the second core part in the axial direction is A, wherein 0.05L≤A≤0.1L.

[0012] In the stator core provided in an embodiment of the present invention, the outer side walls of the first core portion and the second core portion are both provided with positioning grooves extending in their own axial directions, and the positioning grooves on the second core portion and the positioning grooves on the first core portion are overlapped and aligned in the axial direction of the core body.

[0013] In a second aspect, an embodiment of the present invention provides a stator, which includes the stator core described in the first aspect.

[0014] In a third aspect, an embodiment of the present invention provides a motor, which includes the stator described in the second aspect.

[0015] The embodiment of the present invention provides a stator core, a stator and a motor, wherein the stator core comprises a core body, wherein the inner side of the core body is provided with a plurality of surface stator slots spaced apart along the circumferential direction, and at least part of the slot walls of the surface stator slots gradually expand from the inside to the outside in the axial direction of the core body to form a winding inclined surface. The stator core of the present application forms a winding inclined surface by gradually expanding at least part of the slot walls of the surface stator slots on the inner side of the core body in the axial direction of the core body, so that the winding can be bent and shaped along the winding inclined surface from the surface stator slots. Compared with the stator designed by the traditional stator core, the designed stator has a shorter winding length at the stator end and a longer effective length, which can effectively reduce the magnetic leakage rate at the stator end and improve the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0017] Figure 1 An axial view of a stator core provided by an embodiment of the present invention;

[0018] Figure 2 for Figure 1 A magnified view of part A;

[0019] Figure 3 A side cross-sectional view of a stator core provided in an embodiment of the present invention;

[0020] Figure 4 for Figure 3 A magnified view of part B;

[0021] Figure 5 An axial view of a stator punching sheet provided by an embodiment of the present invention;

[0022] Figure 6 A cross-sectional view of a stator provided by an embodiment of the present invention;

[0023] Figure 7 It is the axial diagram of the traditional stator core;

[0024] Figure 8 It is a side cross-sectional view of a conventional stator core;

[0025] Fig. 9 is a cross-sectional view of a conventional stator;

[0026] The reference numerals in the figures are:

[0027] 100, core body; 10, first core part; 11, internal stator slot; 20, second core part; 201, stator punching sheet; 2010, punching sheet stator slot; 21, surface stator slot; 2100, winding slope; 2101, first slot wall; 2102, second slot wall; 2103, arc-shaped slot wall; 30, positioning slot; 200, stator; 210, stator winding; 300, traditional stator core. DETAILED DESCRIPTION

[0028] 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 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.

[0029] The directional terms mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inner", "outer", "side", etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used to illustrate and understand the present invention, but are not used to limit the present invention. In addition, in the drawings, structures with similar or identical structures are represented by the same reference numerals.

[0030] Reference Figures 1 to 9 For details, please refer to Figure 1 and Figure 2 , which shows an embodiment of the stator core provided by the present invention, and the structure and working principle of the stator core are described in detail below in conjunction with the drawings of the specification. The stator core comprises a core body 100, and a plurality of surface stator slots 21 are arranged at intervals along the circumferential direction on the inner side of the core body 100, and at least part of the slot walls of the surface stator slots 21 gradually expand from the inside to the outside in the axial direction of the core body 100 to form a winding inclined surface 2100.

[0031] In specific implementation, the stator core is the basic component structure of the motor stator. During the design stage, the stator core is made of a certain number of stator punchings through a stacking process. The slots inside the stator core are also called stator slots, which are mainly used to install windings. Figure 7 and Figure 8 As shown, the conventional stator core 300 is composed of stator punching sheets of the same specification and size stacked together, and the stator slots formed as a whole are straight in the axial direction of the stator. When installing the winding according to the double-layer stacked winding scheme, the winding at the end of the core needs to be bent and shaped. During the shaping, the winding can only be bent outside the stator slot, and a certain adjustment distance needs to be reserved between the bending part and the stator slot, so that the end winding of the entire stator will be much higher than the end face of the stator core in the axial direction of the stator, such as Fig. 9 As shown, m represents the length of the end winding. In the axial direction of the stator, in the stator designed with the traditional stator core 300, the length of the stator end winding accounts for about 3 / 4 of the axial length of the core. However, the effective length of the end winding actually only accounts for about half of the length of the bent part. As a result, the magnetic leakage rate at the stator end accounts for a high proportion, and the length of the winding is also seriously wasted.

[0032] In this embodiment, Figure 1 and Figure 2As shown, the stator core includes a core body 100, which is the main body part of the core body 100. During the design stage of the stator core, the core body 100 is formed by stacking a certain number of stator punchings. A plurality of surface stator slots 21 are arranged on the inner side of the core body 100 along the circumferential direction. The surface stator slots 21 are specifically arranged as slots arranged on the surface of one or both ends of the core body 100 in the axial direction. Each surface stator slot 21 has the same shape, and at least part of the slot wall of each surface stator slot 21 gradually expands from the inside to the outside in the axial direction of the core body 100 to form a winding slope 2100. The winding slope 2100 is specifically an inclined structure inclined radially relative to the core body 100, similar to a chamfered structure. The inclination angle of the winding slope 2100 relative to the radial direction of the core body 100 can be designed according to the design requirements of the stator end winding, and is not limited here. At least part of the slot wall of the surface stator slot 21 forms a winding inclined surface 2100. The slot wall of the surface stator slot 21 on any side in the tangential direction of the core body 100 may form a winding inclined surface 2100, or the slot walls on both sides of the surface stator slot 21 in the tangential direction of the core body 100 (the tangent direction of the outer circle of the core body 100) are designed to form winding inclined surfaces 2100, or all the slot walls of the surface stator slot 21 form winding inclined surfaces 2100. The slot wall of the surface stator slot 21 that forms the winding slope 2100 is specifically determined by the direction of the winding bending. For example, when the winding design needs to bend to the left along the tangential direction of the core body 100, the slot wall of the surface stator slot 21 on the left side of the tangential direction of the core body 100 is designed to form the winding slope 2100. When the winding design needs to bend to the right side of the tangential direction of the core body 100, the slot wall of the surface stator slot 21 on the right side of the tangential direction of the core body 100 is designed to form the winding slope 2100. In the stage of designing the stator, the winding is embedded in the surface stator slot 21 on the inner side of the core body 100. When the winding is being shaped, the winding can be bent starting from the surface stator slot 21 on the inner side of the core body 100. The winding is bent along the slot wall forming the winding inclined surface 2100 in the surface stator slot 21. The part where the winding starts to bend is in the surface stator slot 21, and the bent part is attached to the slot wall forming the winding inclined surface 2100, thereby reducing the length of the end winding. Figure 6 As shown, m1 represents the length of the end winding. In the axial direction of the stator, the length of the end winding can only account for about 1 / 2 of the axial length of the entire core body 100, and the actual effective length of the winding is also longer. Figure 8 The stator designed with the conventional stator core 300 shown has a shorter length of the end winding, which effectively reduces the magnetic leakage rate at the end of the stator, improves the performance of the motor and also saves the material cost of the winding.

[0033] In this embodiment, at least part of the slot wall of the surface stator slot on the inner side of the core body is gradually expanded from the inside to the outside to form a winding slope, so that the winding can be bent and shaped along the winding slope from the surface stator slot. Compared with the stator designed with a traditional stator core, the designed stator has a shorter stator end winding length and a longer effective length, which can effectively reduce the leakage magnetic rate of the stator end and improve the motor performance.

[0034] In one embodiment, referring to Figure 2 The surface stator slot 21 includes a first slot wall 2101 and a second slot wall 2102 which are opposite to each other in the tangential direction of the core body 100 , and at least one of the first slot wall 2101 and the second slot wall 2102 is formed with the winding inclined surface 2100 . In a specific implementation, the first slot wall 2101 is a slot wall on one side of the surface stator slot 21 in the tangential direction of the core body 100 (the tangential direction of the outer circle of the core body 100), and the second slot wall 2102 is the slot wall on the other side of the surface stator slot 21 in the tangential direction of the core body 100, that is, the first slot wall 2101 and the second slot wall 2102 are two opposite slot walls of the surface stator slot 21 in the tangential direction of the core body 100. When the first slot wall 2101 serves as the slot wall on the left side of the tangential direction of the core body 100, the second slot wall 2102 can serve as the slot wall on the right side of the tangential direction of the core body 100. When the first slot wall 2101 serves as the slot wall on the right side of the tangential direction of the core body 100, the second slot wall 2102 serves as the slot wall on the left side of the tangential direction of the core body 100. The first slot wall 2101 and the second slot wall 2102 both form a winding inclined surface 2100 . In the same surface stator slot 21 , the winding inclined surface 2100 formed by the first slot wall 2101 and the winding inclined surface 2100 formed by the second slot wall 2102 are inclined in opposite directions. During the stator design stage, after the winding is embedded in the surface stator slot 21 on the inner side of the core body 100, the winding can be bent along the tangent direction of the core body 100 toward the first slot wall 2101 or the second slot wall 2102 according to design requirements when the winding is being shaped. The winding is bent from the surface stator slot 21 of the core body 100. Regardless of whether the winding is bent along the tangent direction of the core body 100 toward the first slot wall 2101 or the second slot wall 2102, the bending part of the winding can start from the surface stator slot 21. The bent part of the winding is attached to the first slot wall 2101 or the second slot wall 2102 formed with a winding slope 2100, and the length of the winding at the stator end is reduced, effectively reducing the leakage magnetic rate of the stator end.

[0035] Further, refer to Figure 2The surface stator slot 21 also includes an arc-shaped slot wall 2103 radially away from the axis of the core body 100, and the two ends of the arc-shaped slot wall 2103 are respectively connected to the first slot wall 2101 and the second slot wall 2102, wherein the arc-shaped slot wall 2103 forms the winding slope 2100. In a specific implementation, the arcuate slot wall 2103 is the slot wall of the internal stator slot 11 on the radial side of the core body 100 away from the axis of the core body 100, and the two ends of the arcuate slot wall 2103 are respectively connected with the ends of the first slot wall 2101 and the second slot wall 2102 away from the axis of the core body 100. The arcuate slot wall 2103 is an arc shape on the axial section of the core body 100, and the arcuate slot wall 2103 is also formed with a winding inclined surface 2100 like the first slot wall 2101 and the second slot wall 2102. The actual arcuate slot wall 2103 is an arc-shaped inclined surface inclined relative to the axis of the core body 100. During the stator design stage, the winding needs to be embedded into the surface stator slot 21, and the first slot wall 2101, the second slot wall 2102, and the arc-shaped slot wall 2103 form a winding slope 2100 to guide the winding to be embedded, thereby reducing the difficulty of embedding. Regardless of whether the winding is embedded manually or by machine, the winding can be easily embedded into the stator slot formed by the internal stator slot 11 of the core body 100 and the surface stator slot 21. After the winding is embedded, when the winding is shaped, the winding is bent along the tangent of the core body 100 toward the direction of the first slot wall 2101 or the direction of the second slot wall 2102 according to the design requirements. The winding itself is a combination of multiple enameled wires. The bending operation is actually the bending of each enameled wire. The overall bending direction of the winding is along the tangent of the core body 100. Most of the enameled wires in the center position of the stator slot are bent along the tangent of the core body 100, but the enameled wires in the stator slot close to the outer circle of the stator need to have a certain bending adjustment space, and the bending direction is not parallel to the tangent of the core body 100, but has a certain angle with the tangent of the core body 100. The arcuate slot wall 2103 serves as the slot wall of the surface stator slot 21 close to the outer circle of the stator. By forming the arcuate slot wall 2103 into a winding slope 2100, the enameled wire in the winding close to the outer circle of the stator can also be bent from the surface stator slot 21. This part of the bent enameled wire can be attached to the arcuate slot wall 2103 with the winding slope 2100, so that the overall length of the stator end winding is shorter, and the leakage magnetic rate of the stator end is further reduced.

[0036] In one embodiment, referring to Figure 4, the inclination angle of the winding inclined surface 2100 relative to the radial direction of the core body 100 is θ, wherein 40°≤θ≤50°. In a specific implementation, the inclination angle of the winding inclined surface 2100 relative to the radial direction of the core body 100 determines the curvature of the winding to a certain extent. The larger the inclination angle of the winding inclined surface 2100 relative to the radial direction of the core body 100 is designed, the larger the curvature of the winding is bent. The smaller the inclination angle of the winding inclined surface 2100 relative to the radial direction of the core body 100 is designed, the smaller the curvature of the winding is bent. When the inclination angle of the winding slope 2100 relative to the radial direction of the core body 100 is too large, the curvature of the bending of the winding is too large, which will cause the winding to be much higher than the end face of the core body 100. When the inclination angle of the winding slope 2100 relative to the radial direction of the core body 100 is too small, the curvature of the bending of the winding is too small, which can easily damage the enameled wire of the winding and affect the performance of the winding. The inclination angle of the winding slope 2100 relative to the radial direction of the core body 100 needs to be designed to be within a reasonable range. In this embodiment, θ represents the radial inclination angle of the winding slope 2100 relative to the core body 100. The radial inclination angle θ of the winding slope 2100 relative to the core body 100 is designed to be 40°≤θ≤50°, that is, the radial inclination angle of the winding slope 2100 relative to the core body 100 can be a maximum of 50° and a minimum of 40°. In actual applications, the radial inclination angle of the winding slope 2100 relative to the core body 100 is designed according to the relationship 40°≤θ≤50°. The curvature of the winding is moderate and will not affect the performance of the winding. At the same time, the stator end winding will not be too much higher than the end face of the core body 100.

[0037] Furthermore, the radial inclination angle θ of the winding slope 2100 relative to the core body 100 is preferably designed to be θ=45°. By designing the radial inclination angle of the winding slope 2100 relative to the core body 100 to be 45°, the winding length at the stator end is shortened to an optimal length and the magnetic leakage rate at the stator end is minimized under the premise that the bending of the winding enameled wire does not affect the winding performance.

[0038] In one embodiment, referring to Figure 3The core body 100 includes a first core part 10 and a second core part 20. The inner side of the first core part 10 is provided with a plurality of internal stator slots 11 spaced apart along the circumferential direction. The surface stator slots 21 are spaced apart along the circumferential direction of the inner side of the second core part 20. The surface stator slots 21 overlap and align with the internal stator slots 11. The second core part 20 is provided on at least one side of the first core part 10 in the axial direction. In a specific implementation, the core body 100 is composed of a first core part 10 and a second core part 20. The inner side of the first core part 10 is provided with a plurality of internal stator slots 11 spaced apart along the circumferential direction. Each internal stator slot 11 has the same shape. During the design stage, the first core part 10 is formed by stacking stator punchings of the same specifications and sizes. The slot body size of the punching slots of these stator punchings is the same, and they overlap and align to form the internal stator slots 11 of the first core part 10. The second core part 20 is arranged on at least one side of the first core part 10 in the axial direction. When designing the core body 100, the second core part 20 can be arranged on any side of the first core part 10 in the axial direction, or two second core parts 20 can be arranged on both sides of the first core part 10 in the axial direction. A plurality of surface stator slots 21 are distributed along the circumferential direction of the inner side of the second core part 20, that is, the surface stator slots 21 are slots on the second core part 20, and the surface stator slots 21 on the inner side of the second core part 20 are the same in number and axial position as the internal stator slots 11 on the inner side of the first core part 10, so that the surface stator slots 21 on the inner side of the second core part 20 overlap and align with the internal stator slots 11 on the inner side of the first core part 10 to form a deep slot structure for winding embedding. If the second core portion 20 is arranged on one side of the first core portion 10 in the axial direction, the stator core can have surface stator slots 21 on one axial side, and the winding can be bent along the winding bevel 2100 formed by the slot wall of the surface stator slot 21 on one axial side of the stator core, so that the length of the end winding on one axial side of the stator core is shortened; if the second core portion 20 is arranged on both sides of the first core portion 10 in the axial direction, the stator core can have surface stator slots 21 on both axial sides, and the winding can be bent along the winding bevel 2100 formed by the slot wall of the surface stator slot 21 on both axial sides of the stator core, so that the length of the end winding on both axial sides of the stator core is shortened, the overall length of the stator end winding is shorter, and the leakage magnetic rate of the stator end is further reduced.

[0039] Further, see Figure 5The second core portion 20 includes a plurality of stator punching sheets 201, and a plurality of punching sheet stator slots 2010 are distributed along the circumferential direction on the inner side of each stator punching sheet 201. The plurality of stator punching sheets 2010 are overlapped along the axial direction of the second core portion 20. In the axial direction of the second core portion 20, the slot widths of the punching sheet stator slots 2010 of the plurality of stator punching sheets 201 increase successively in the direction away from the first core portion 10. In a specific implementation, the second core portion 20 is designed to be formed by stacking a plurality of stator punching sheets 201 of different specifications and sizes. The inner side of each stator punching sheet 201 is provided with a plurality of spaced-apart punching sheet stator slots 2010 along the circumferential direction. The overall slot widths of the punching sheet stator slots 2010 of these stator punching sheets 201 are not consistent. In the axial direction of the core body 100, the slot widths of the punching sheet stator slots 2010 of the plurality of stator punching sheets 201 constituting the core body 100 are directed away from the first core portion 10. The stator slots 2010 of the stator punching sheets 201 with increasing slot widths are overlapped and aligned to form the surface stator slots 21 of the core body 100, so that the slot wall of the surface stator slot 21 is formed with a winding bevel 2100 as a whole. From the perspective of the stator punching sheet 201, the winding bevel 2100 is not a smooth surface, but a rough surface formed by fitting the slot edges of multiple stator slots 2010 of the punching sheets. The smoothness of the winding bevel 2100 is determined by the thickness of the stator punching sheet 201. In the stage of designing the stator core, the multiple stator punching sheets constituting the first core part 10 are stacked together, and then the multiple stator punching sheets 201 constituting the second core part 20 are stacked on the outermost stator punching sheets constituting the first core part 10 to form the entire core body 100. The stator slots 2010 of the stator punching sheets 201 constituting the second core portion 20 are overlapped and aligned to form the surface stator slots 21 of the core body 100. The winding bevel 2100 is formed by successively increasing the slot widths of the stator slots 2010 of the multiple stator punching sheets 201 in the direction away from the first core portion 10. The winding can be bent from the surface stator slots 21 on the inner side of the core body 100, and the bent portion is attached to the slot wall forming the winding bevel 2100, thereby reducing the length of the end winding, thereby reducing the leakage magnetic rate at the stator end and improving the motor performance.

[0040] In one embodiment, referring to Figure 3 , the distance between the two opposite ends of the core body 100 in the axial direction is L, and the distance between the two opposite ends of the second core part 20 in the axial direction is A, wherein 0.05L≤A≤0.1L. In a specific implementation, the core body 100 is composed of two parts, the first core part 10 and the second core part 20, and the overall axial length of the core body 100 is the sum of the axial lengths of the first core part 10 and the second core part 20. Figure 3As shown, L represents the distance between the two opposite ends of the core body 100 in the axial direction, that is, L represents the axial length of the entire core body 100, and A represents the distance between the two opposite ends of the second core portion 20 in the axial direction, that is, A represents the axial length of the entire second core portion 20. In this embodiment, two second core portions 20 are respectively arranged at the two ends of the first core portion 10 in the axial direction as an example. When designing specifically, the length of the second core portion 20 is designed according to the relationship 0.05L≤A≤0.1L, that is, the length of the second core portion 20 at each end of the core body 100 can be designed to account for 5%~10% of the entire core body 100. In this way, the sum of the overall lengths of the two second core portions 20 arranged at the two ends of the core body 100 accounts for 10%~20% of the entire core body 100. Regardless of the overall length design size of the core body 100, the length of the second core portion 20 at each end of the core body 100 is fixed to account for 5%~10% of the entire core body 100. The solution of shortening the length of the stator end winding can be applicable to stator designs of various length sizes. When designing stators of various length sizes, the end windings of the stators can reach the optimal length standard.

[0041] In one embodiment, referring to Figure 1 The first core portion 10 and the second core portion 20 both have positioning grooves 30 extending in their axial directions on their outer side walls, and the positioning grooves 30 on the second core portion 20 and the positioning grooves 30 on the first core portion 10 overlap and align with each other in the axial direction of the core body 100. In a specific implementation, positioning grooves 30 extending along the axial direction are provided on the outer walls of the first core portion 10 and the second core portion 20, and the positioning grooves 30 are straight groove structures. The positioning grooves 30 provided on the outer wall of the first core portion 10 extend in the axial direction of the first core portion 10 and cross the end surfaces of the first core portion 10 at both ends. Similarly, the positioning grooves 30 provided on the outer wall of the second core portion 20 extend in the axial direction of the second core portion 20 and cross the end surfaces of the second core portion 20 at both ends. The positioning grooves 30 on the first core portion 10 and the positioning grooves 30 on the second core portion 20 overlap and are aligned in the axial direction of the second core portion 20. There is no limit on the number of the positioning grooves 30 on the first core portion 10 and the positioning grooves 30 on the second core portion 20. From the point of view of the basic composition of the first core portion 10 and the second core portion 20, the positioning groove 30 is designed on the stator punching sheets constituting the first core portion 10 and the second core portion 20. In the process of designing the core body 100, the connection and alignment of the first core portion 10 and the second core portion 20 can be quickly achieved through the positional relationship between the positioning groove 30 on the first core portion 10 and the positioning groove 30 on the second core portion 20, thereby facilitating the design of the stator core.

[0042] In one embodiment, a stator 200 is provided, such as Figure 6As shown, the stator 200 includes the stator core described in the above embodiment, and the stator 200 also includes components such as a stator winding 210. The stator winding 210 is embedded in the surface stator slot 21 on the inner side of the stator core. The stator 200 can specifically adopt a double-layer stacked winding solution. When the stator winding 210 is shaped, the stator winding 210 starts to be bent from the surface stator slot 21 of the core body 100, so that the stator winding 210 is bent along the slot wall of the surface stator slot 21 formed with a winding inclined surface 2100. In the axial direction of the stator 200, the length m1 of the end winding can only account for about 1 / 2 of the axial length of the entire stator core, and the actual effective length of the winding is also longer, compared with Figure 8 The stator designed with the traditional stator core 300 shown has a shorter length of the end winding and a lower proportion of the stator 200 end leakage magnetic flux. When the stator 200 is used in a motor, the motor has a higher efficiency and the overall length of the motor can be designed to be shorter, which improves the performance of the motor while also saving the material cost of the winding.

[0043] In one embodiment, a motor is provided, which uses the stator 200 described in the above embodiment, and the motor also includes a housing, a rotor and other components. The stator 200 is used to generate a rotating magnetic field to interact with the rotor to rotate the rotor so that the motor can operate. Among them, since the above embodiment has already described the specific structure of the stator 200 in detail, it will not be repeated here for the sake of brevity of the specification.

[0044] The motor in this embodiment adopts the stator provided by the present invention, so the efficiency of the motor is improved and the overall length of the motor is shorter.

[0045] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A stator core, characterized in that: include: An iron core body, wherein a plurality of surface stator slots are arranged at intervals along the circumferential direction on the inner side of the iron core body, and at least a portion of the slot walls of the surface stator slots gradually expand from the inside to the outside in the axial direction of the iron core body to form a winding inclined surface, and the winding inclined surface has an inclination angle θ relative to the radial direction of the iron core body, wherein 40°≤θ≤50°; The core body includes a first core part and a second core part, the inner side of the first core part is provided with a plurality of internal stator slots spaced apart along the circumferential direction, the surface stator slots are spaced apart along the circumferential direction of the inner side of the second core part, the surface stator slots overlap and align with the internal stator slots, and the second core part is arranged on at least one side of the first core part in the axial direction; the distance between the two opposite ends of the core body in the axial direction is L, and the distance between the two opposite ends of the second core part in the axial direction is A, wherein 0.05L≤A≤0.1L.

2. The stator core according to claim 1, characterized in that: The surface stator slot includes a first slot wall and a second slot wall that are opposite to each other in a tangential direction of the core body, and at least one of the first slot wall and the second slot wall is formed with the winding slope.

3. The stator core according to claim 2, characterized in that: The surface stator slot also includes an arcuate slot wall radially away from the core body axis, wherein both ends of the arcuate slot wall are respectively connected to the first slot wall and the second slot wall, wherein the arcuate slot wall forms the winding slope.

4. The stator core according to claim 1, characterized in that: The second core portion includes a plurality of stator punching sheets, each of which has a plurality of punching sheet stator slots spaced apart along its circumferential direction on its inner side, the plurality of stator punching sheets are overlapped along the axial direction of the second core portion, and in the axial direction of the second core portion, the slot widths of the punching sheet stator slots of the plurality of stator punching sheets increase successively in a direction away from the first core portion.

5. The stator core according to claim 1, characterized in that: The outer side walls of the first core part and the second core part are both provided with positioning grooves extending in the axial direction thereof, and the positioning grooves on the second core part and the positioning grooves on the first core part are overlapped and aligned in the axial direction of the core body.

6. A stator, characterized in that: The invention comprises the stator core as claimed in any one of claims 1 to 5.

7. A motor, characterized in that: Comprising the stator as claimed in claim 6.

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