Stator punching sheet, stator core, stator and motor

Abstract

The utility model provides a stator punching sheet, a stator iron core, a stator and a motor, the stator punching sheet comprises a first punching sheet, the first punching sheet is provided with a plurality of first cooling holes distributed in a circumferential array around the axis of the first punching sheet, and each first cooling hole penetrates through two end surfaces of the first punching sheet. The interval between every two adjacent first cooling holes is smaller than the length of each first cooling hole; a plurality of liquid inlet grooves are distributed on the first punching sheet, and each liquid inlet groove is recessed inwards from the outer peripheral surface of the first punching sheet and is communicated with part of the first cooling holes. The first cooling holes not only can be used for cooling the first punching sheet by cooling liquid, but also can be used as circulation channels of the cooling liquid, thereby improving the space utilization rate of the motor, improving the power density of the motor, and reducing the production cost and the assembly difficulty. The multiple liquid inlet grooves are distributed in the first punching sheet and can receive cooling liquid at the same time so that the cooling liquid can flow into the first cooling holes, the flow of the cooling liquid can be increased, and the flowing resistance of the cooling liquid can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of motors, and particularly relates to a stator punching sheet, a stator core, a stator and a motor. Background Art

[0002] With the development of the new energy industry, higher requirements are put forward for the power and volume of motors. The power of the motor needs to be increased and the volume needs to be reduced. With the improvement of requirements, the heat dissipation of the motor has become a problem.

[0003] In some related technologies, oil cooling accessories such as oil injection rings, oil shower plates, and oil injection pipelines are usually provided to cool the motor. The setting of the above components not only occupies the internal space of the motor, resulting in a decrease in the power density of the motor, but also leads to an increase in cost and the occurrence of assembly problems. Utility Model Content

[0004] The embodiments of this application provide a stator punching sheet, a stator core, a stator and a motor, which can improve the power density of the motor, reduce costs, and optimize assembly.

[0005] In a first aspect, the embodiments of this application provide a stator punching sheet, which includes a first punching sheet. A plurality of first cooling holes are circumferentially and arrayedly distributed around the axis of the first punching sheet. Each first cooling hole penetrates through two end faces of the first punching sheet, and the interval between adjacent first cooling holes is less than the length of the first cooling hole; a plurality of liquid inlet grooves are distributed on the first punching sheet, and each liquid inlet groove is recessed from the outer peripheral surface of the first punching sheet towards the inside and is communicated with some of the first cooling holes.

[0006] Optionally, the plurality of liquid inlet grooves are circumferentially and arrayedly distributed along the first punching sheet, and each liquid inlet groove is communicated with adjacent first cooling holes.

[0007] Optionally, the number of the liquid inlet grooves accounts for one-sixth to one-twelfth of the number of the first cooling holes.

[0008] In a second aspect, the embodiments of this application provide a stator core, which includes a second punching sheet group and the stator punching sheet; there are a plurality of the first punching sheets, and the plurality of first punching sheets are coaxially stacked, and adjacent first punching sheets are arranged in a staggered manner around the axis to make all the first cooling holes of adjacent first punching sheets partially overlap to form a cooling channel; the second punching sheet group is arranged in pairs and coaxially stacked with the first punching sheet at both ends formed by the coaxial stacking of the plurality of first punching sheets respectively. The second punching sheet group includes a second punching sheet, and a plurality of second cooling holes are circumferentially and arrayedly distributed around the axis of the second punching sheet. The second cooling holes penetrate through two end faces of the second punching sheet, and at least some of the second cooling holes are communicated with some of the first cooling holes.

[0009] Optionally, the liquid inlet grooves adjacent to the first punching piece correspond to each other one by one, and the corresponding liquid inlet grooves partially overlap.

[0010] Optionally, the second cooling holes include outer spray holes, reinforcing ribs and inner spray holes. The reinforcing ribs are located between the outer spray holes and the inner spray holes, and the inner spray holes are located between the axis of the second punching piece and the outer spray holes; the cross-sectional areas of both the outer spray holes and the inner spray holes are larger than the cross-sectional area of the reinforcing ribs.

[0011] Optionally, the second punching piece group includes three second punching pieces. The angle between adjacent second cooling holes on the second punching piece is R, and adjacent three second cooling holes form a hole group; along the clockwise direction within the hole group, the distances between the three second cooling holes and the axis of the second punching piece gradually decrease. The three second punching pieces are coaxially stacked. From the first punching piece to the second punching piece, the adjacent second punching pieces are sequentially twisted counterclockwise around the axis by n times of the angle R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3.

[0012] Optionally, the second punching piece group includes three second punching pieces. The angle between adjacent second cooling holes on the second punching piece is R, and adjacent three second cooling holes form a hole group; along the clockwise direction within the hole group, the distances between the three second cooling holes and the axis of the second punching piece gradually increase. The three second punching pieces are coaxially stacked. From the first punching piece to the second punching piece, the adjacent second punching pieces are sequentially twisted clockwise around the axis by n times of the angle R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3.

[0013] Optionally, it further includes a third punching piece group. The third punching piece group includes at least one third punching piece, and the third punching piece group is coaxially stacked between the first punching piece and the second punching piece; a plurality of third cooling holes are circumferentially arrayed around the axis on the third punching piece, and the third cooling holes penetrate through both end faces of the third punching piece; the ratio of the number of the third cooling holes to the number of the second cooling holes is 1:3, which is used to connect the hole types in the hole types formed by the plurality of second cooling holes whose paths face the stator winding with at least part of the first cooling holes.

[0014] Optionally, a plurality of winding grooves are circumferentially arrayed around the axis on the first punching piece, the second punching piece, and the third punching piece; among the hole types formed by the plurality of second cooling holes, the ratio of the number of the hole types whose paths face the winding grooves to the number of the winding grooves is greater than 1:2.

[0015] Optionally, the cross-sectional area of the first cooling holes is larger than the cross-sectional area of the third cooling holes, and the cross-sectional area of the third cooling holes is larger than the cross-sectional area of the second cooling holes.

[0016] Optionally, a plurality of first welding grooves are circumferentially arrayed around the axis on the first punching sheet. The first welding grooves include a first main welding groove and a first sub-welding groove. The first main welding grooves and the first sub-welding grooves of two adjacent first punching sheets are located on a first straight line. A plurality of third welding grooves are circumferentially arrayed around the axis on the third punching sheet. The width of the third welding groove is greater than that of the first welding groove. The adjacent third welding grooves and the first main welding groove or the first sub-welding groove are located on a second straight line. A plurality of second welding grooves are circumferentially arrayed around the axis on the second punching sheet. The second welding grooves include a second main welding groove, a second sub-welding groove, and a second auxiliary welding groove. In the second punching sheet group, the second main welding grooves, the second sub-welding grooves, and the second auxiliary welding grooves of three adjacent second punching sheets are located on a third straight line. The number of the first welding grooves, the second welding grooves, and the third welding grooves is the same, and the first straight line, the second straight line, and the third straight line coincide.

[0017] In a third aspect, an embodiment of the present application provides a stator, which includes a housing, a stator winding, and the stator core. The stator core is installed in the housing, and the stator winding is installed on the stator core. The housing is provided with a liquid inlet and an annular groove, and the annular groove is communicated with the liquid inlet and a plurality of liquid inlet grooves.

[0018] In a fourth aspect, an embodiment of the present application provides a motor, which includes the stator.

[0019] An embodiment of the present application provides a stator punching sheet, a stator core, a stator, and a motor. A plurality of first cooling holes on the stator punching sheet are circumferentially arrayed around the axis of the first punching sheet. The first cooling holes can not only be used as the contact surface between the first punching sheet and the coolant to cool the first punching sheet by the coolant, but also be used as the flow channel of the coolant, without additionally arranging oil-cooling oil circuit accessories, improving the space utilization rate of the motor, further improving the power density of the motor, and reducing the production cost and assembly difficulty. A plurality of liquid inlet grooves are distributed on the first punching sheet, and the plurality of liquid inlet grooves can receive the coolant simultaneously to allow the coolant to flow into the first cooling holes, thereby increasing the flow rate of the coolant and reducing the flow resistance of the coolant. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0021] Figure 1 It is a schematic structural diagram of the first punching sheet in some embodiments of the present application;

[0022] Figure 2 For the present applicationFigure 1 Partial enlarged view;

[0023] Figure 3 Schematic diagram of the coolant flow in some embodiments of the present application;

[0024] Figure 4 Schematic diagram of the connection of the first punching sheet in some embodiments of the present application;

[0025] Figure 5 Of the present application Figure 4 Front view;

[0026] Figure 6 Of the present application Figure 5 Partial enlarged view at A;

[0027] Figure 7 Schematic diagram of the structure of the stator core in some embodiments of the present application;

[0028] Figure 8 Exploded view of the first punching sheet, the second punching sheet, and the third punching sheet in some embodiments of the present application;

[0029] Figure 9 Schematic diagram of the structure of the second punching sheet group in some embodiments of the present application;

[0030] Figure 10 Of the present application Figure 9 Partial enlarged view at B;

[0031] Figure 11 Of the present application Figure 9 Front view;

[0032] Figure 12 Of the present application Figure 11 Partial enlarged view at C;

[0033] Figure 13 Of the present application Figure 12 Cross-sectional view at D;

[0034] Figure 14 Of the present application Figure 12 Cross-sectional view at E;

[0035] Figure 15 Of the present application Figure 12 Cross-sectional view at F;

[0036] Figure 16 Schematic diagram of the structure of the stator in some embodiments of the present application;

[0037] Figure 17 Schematic diagram of the structure of the housing in some embodiments of the present application.

[0038] In the figure: 1 - stator punching sheet; 11 - first punching sheet; 111 - liquid inlet groove; 112 - first cooling hole; 113 - first main welding groove; 114 - first sub - welding groove; 2 - third punching sheet group; 21 - third punching sheet; 211 - third cooling hole; 212 - third welding groove; 3 - second punching sheet group; 31 - second punching sheet; 311 - second cooling hole; 3111 - external spray hole; 3112 - reinforcing rib; 3113 - internal spray hole; 312 - second main welding groove; 313 - second sub - welding groove; 314 - second auxiliary welding groove; 4 - winding groove; 5 - stator winding; 6 - housing; 61 - liquid inlet; 62 - annular groove. Detailed implementation manners

[0039] The features and exemplary embodiments of various aspects of the present application will be described in detail below. To make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than to limit the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present application by showing examples of the present application.

[0040] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0041] With the development of the new energy industry, the power of motors is getting higher and higher, and the volume is getting smaller and smaller. As a result, the problem of motor heat dissipation has gradually become prominent. Some related technologies use oil - cooling accessories such as oil - spraying rings, oil - shower plates, and oil - spraying pipelines to cool the motor, which not only causes a decrease in the power density of the motor, but also increases the cost and causes assembly problems.

[0042] To solve the above - mentioned technical problems, the present application provides a stator punching sheet, a stator core, a stator and a motor.

[0043] Please refer to Figures 1 to 6 , Figure 1Schematic diagram of the structure of the first punching sheet in some embodiments of the present application; Figure 2 of the present application Figure 1 partial enlarged view; Figure 3 Schematic diagram of the coolant flow in some embodiments of the present application; Figure 4 Schematic diagram of the connection of the first punching sheet in some embodiments of the present application; Figure 5 of the present application Figure 4 front view; Figure 6 of the present application Figure 5 partial enlarged view at A. Among them, Figure 2 the first cooling holes 112 that are connected to the liquid inlet groove 111 and disappear are indicated by dashed lines.

[0044] In a first aspect, some embodiments of the present application provide a stator punching sheet 1, as Figure 1 shown, the stator punching sheet 1 includes a first punching sheet 11, and a plurality of first cooling holes 112 are circumferentially and arrayedly distributed around the axis of the first punching sheet 11, and each first cooling hole 112 penetrates through both end faces of the first punching sheet 11. As Figure 2 shown, the interval (L2) between adjacent first cooling holes 112 is less than the length (L1) of the first cooling hole 112; a plurality of liquid inlet grooves 111 are distributed on the first punching sheet 11, and each liquid inlet groove 111 is recessed from the outer circumferential surface of the first punching sheet 11 towards the inside and is connected to some of the first cooling holes 112.

[0045] On the first punching sheet 11, the first cooling holes 112 penetrate through both end faces of the first punching sheet 11, and the first cooling holes 112 are close to the circumferential surface of the first punching sheet 11 and have a gap with the circumferential surface of the first punching sheet 11. The liquid inlet groove 111 connects the circumferential surface of the first punching sheet 11 and some of the first cooling holes 112, so that these first cooling holes 112 can communicate with the circumferential surface of the first punching sheet 11. When the liquid inlet groove 111 connects the first cooling hole 112 and the circumferential surface of the first punching sheet 11, one liquid inlet groove 111 can communicate with one first cooling hole 112 or can communicate with a plurality of first cooling holes 112.

[0046] A plurality of first cooling holes 112 are circumferentially and arrayedly distributed around the axis of the first punching sheet 11, and the interval (L2) between adjacent first cooling holes 112 is less than the length (L1) of the first cooling hole 112. As Figures 4 to 6 shown, when a plurality of (for example, two) first punching sheets 11 are coaxially stacked and arranged with a stagger around the axis (rotated by a certain angle), all the first cooling holes 112 of adjacent first punching sheets 11 can be partially overlapped, so as to form a path for the coolant to be transmitted along the axis of the first punching sheet 11 to both ends. For example, as Figure 3As shown, when a first punching piece 11 and another first punching piece 11 are coaxially superposed and misaligned, the coolant entering from the liquid inlet groove 111 can enter the a-th first cooling hole 112, then flow to the b-th first cooling hole 112, and flow from the b-th first cooling hole 112 to the c-th first cooling hole 112, and so on.

[0047] The first punching piece 11 can be formed by superposing multiple thin sheets with high magnetic permeability. The thin sheets can be silicon steel sheets, which can reduce eddy current loss. The first punching piece 11 is only a naming of the component, and the "punching piece" does not limit the forming process. Optionally, the first punching piece 11 can be processed by punching process, wire cutting process, drilling process, or even CNC process, etc.

[0048] In the technical solution of the above embodiment, multiple first cooling holes 112 are circumferentially arrayed around the axis of the first punching piece 11. First, the first cooling holes 112 can be used as the contact surface between the first punching piece 11 and the coolant (such as cooling oil) to cool the first punching piece 11 with the coolant. Second, the first cooling holes 112 can be used as the flow channels of the coolant, eliminating the need for additional oil cooling circuit accessories, improving the space utilization rate of the motor, thereby increasing the power density of the motor, and reducing the production cost and assembly difficulty. Multiple liquid inlet grooves 111 are distributed on the first punching piece 11. The multiple liquid inlet grooves 111 can receive the coolant simultaneously, allowing the coolant to flow into the first cooling holes 112, thereby increasing the flow rate of the coolant and reducing the flow resistance of the coolant.

[0049] In some embodiments of the present application, as Figure 1 and Figure 2 shown, multiple liquid inlet grooves 111 are circumferentially arrayed along the circumference of the first punching piece 11, and each liquid inlet groove 111 communicates with multiple adjacent first cooling holes 112.

[0050] The multiple liquid inlet grooves 111 are circumferentially arrayed around the axis of the first punching piece 11, and the included angle between any two adjacent liquid inlet grooves 111 is the same. One liquid inlet groove 111 can connect two or more adjacent first cooling holes 112 to the circumferential surface of the first punching piece 11.

[0051] In the technical solution of the above embodiment, the multiple liquid inlet grooves 111 are circumferentially arrayed along the circumference of the first punching piece 11, which can ensure the balance of liquid inlet on the circumferential surface of the first punching piece 11. As Figure 2 shown, each liquid inlet groove 111 communicates with multiple adjacent first cooling holes 112, which can increase the cross-sectional area of liquid inlet (in the plane perpendicular to the axis of the first punching piece 11, the sum of the area of the liquid inlet groove 111 and the area of the first cooling holes 112 it communicates with), further reducing the flow resistance of the coolant.

[0052] In some embodiments of the present application, as Figure 1As shown, the number of liquid inlet grooves 111 accounts for one-sixth to one-twelfth of the number of the first cooling holes 112.

[0053] Exemplarily, the number of liquid inlet grooves 111 may account for one-sixth, one-seventh, one-eighth, one-ninth, one-tenth, one-eleventh, or one-twelfth of the number of the first cooling holes 112, or may be any intermediate value between any two adjacent values above.

[0054] In the technical solution of the above embodiment, the number of liquid inlet grooves 111 accounts for one-sixth to one-twelfth of the number of the first cooling holes 112, which can not only avoid the flow resistance problem caused by a small number of liquid inlet grooves 111, reducing the flow resistance of the coolant, but also avoid the decrease in the structural strength of the first punching sheet 11 caused by a large number of liquid inlet grooves 111, ensuring the structural strength of the first punching sheet 11, and thus achieving a balance of the best benefits between the two.

[0055] Please refer to Figures 7 to 15 , Figure 7 , which is a schematic structural diagram of a stator core according to some embodiments of the present application; Figure 8 , which is an exploded view of a first punching sheet, a second punching sheet, and a third punching sheet according to some embodiments of the present application;

[0056] Figure 9 , which is a schematic structural diagram of a second punching sheet group according to some embodiments of the present application; Figure 10 This is the Figure 9 partial enlarged view at B of the present application; Figure 11 This is the Figure 9 front view of the present application; Figure 12 This is the Figure 11 partial enlarged view at C of the present application; Figure 13 This is the Figure 12 cross-sectional view at D of the present application; Figure 14 This is the Figure 12 cross-sectional view at E of the present application; Figure 15 This is the Figure 12 cross-sectional view at F of the present application.

[0057] Second, as Figure 7 shown, some embodiments of the present application provide a stator core. Since the stator core includes a stator punching sheet 1, the stator core has all the beneficial effects of the stator punching sheet 1 in the above embodiments.

[0058] In some embodiments of the present application, the stator core includes a second lamination group 3 and stator laminations 1; there are multiple first laminations 11, and the multiple first laminations 11 are coaxially stacked. Adjacent first laminations 11 are arranged with a stagger around the axis, and all the first cooling holes 112 of adjacent first laminations 11 partially overlap to form a cooling channel. The second lamination group 3 is arranged in pairs and coaxially stacked with the first laminations 11 at both ends formed by the coaxial stacking of the multiple first laminations 11. The second lamination group 3 includes second laminations 31, and the second laminations 31 are circumferentially and arrayed around the axis with multiple second cooling holes 311. The second cooling holes 311 penetrate through both end faces of the second laminations 31, and at least some of the second cooling holes 311 communicate with some of the first cooling holes 112.

[0059] There can be two or more than two first laminations 11. All the first cooling holes 112 of any adjacent first laminations 11 partially overlap to form a cooling channel, so that the coolant entering from the liquid inlet groove 111 can flow along the cooling channel towards both end faces of the stator core. The liquid inlet grooves 111 of adjacent first laminations 11 correspond to each other one by one. All the liquid inlet grooves 111 on any two adjacent first laminations 11 can partially overlap or not overlap.

[0060] The second lamination group 3 is arranged in pairs. For example, there can be two second lamination groups 3, four second lamination groups 3, six second lamination groups 3, etc. The second laminations 31 in each second lamination group 3 can be one or multiple. In the second lamination groups 3 arranged in pairs, the number of second laminations 31 in each second lamination group 3 can be the same as or different from the number of second laminations 31 in other second lamination groups 3. The second cooling holes 311 on the second laminations 31 can be used as spray holes for spraying coolant onto the stator winding 5.

[0061] When the second cooling holes 311 communicate with the first cooling holes 112, all the second cooling holes 311 can communicate with all the first cooling holes 112, some of the second cooling holes 311 can communicate with all the first cooling holes 112, all the second cooling holes 311 can communicate with some of the first cooling holes 112, or some of the second cooling holes 311 can communicate with some of the first cooling holes 112.

[0062] In the technical solution of the above embodiment, a plurality of first punching sheets 11 are coaxially stacked and arranged with a dislocation around their own axes, and a cooling channel for the coolant to be transferred to both ends of the stator core can be formed. The second punching sheet group 3 is coaxially stacked with the first punching sheets 11 at both ends formed by coaxially stacking a plurality of first punching sheets 11, and the second cooling holes 311 can be used as spray holes for spraying the coolant out of the cooling channel, so that the coolant can be sprayed onto the winding to cool down during use. The stator core includes the first punching sheet 11 and the second punching sheet 31. The types of punching sheets are few, which can reduce the mold opening and management costs of the stator core; through the structural design and connection relationship design of the first punching sheet 11 and the second punching sheet 31, a cooling channel for the coolant to flow and be cooled and spray holes for spraying the coolant onto the winding can be formed, thus eliminating oil circuit accessories such as oil injection rings, oil shower plates, and oil injection pipelines in the traditional solution, improving the power density of the motor, and reducing the production cost and assembly difficulty.

[0063] In some embodiments of the present application, as Figure 7 shown, the liquid inlet grooves 111 of adjacent first punching sheets 11 correspond to each other one by one, and the corresponding liquid inlet grooves 111 partially overlap.

[0064] On adjacent first punching sheets 11, the corresponding liquid inlet grooves 111 partially overlap. When overlapping, the overlapping ratio of the liquid inlet grooves 111 can account for 50% or more of the width of the liquid inlet grooves 111, such as 50%, 60%, 70%, 80%, 90%, or can also account for less than 50% of the width of the liquid inlet grooves 111, such as 40%, 30%, 20%, 10%.

[0065] In the technical solution of the above embodiment, the corresponding liquid inlet grooves 111 of adjacent first punching sheets 11 partially overlap, that is, the corresponding liquid inlet grooves 111 are directly communicated. When laying out the channels for the coolant to flow into the liquid inlet grooves 111 (such as Figure 17 the annular groove 62 on the housing 6 in ), the width of the channel (such as the annular groove 62) can be correspondingly narrowed so that it is only communicated with all the liquid inlet grooves 111 on one first punching sheet 11, thus facilitating the processing of the supporting components (such as the housing 6), reducing the production cost, and improving the structural strength.

[0066] In some embodiments of the present application, as Figure 9 and Figure 10 shown, the second cooling hole 311 includes an outer spray hole 3111, a reinforcing rib 3112, and an inner spray hole 3113. The reinforcing rib 3112 is located between the outer spray hole 3111 and the inner spray hole 3113, and the inner spray hole 3113 is located between the axis of the second punching sheet 31 and the outer spray hole 3111; the cross-sectional areas of both the outer spray hole 3111 and the inner spray hole 3113 are larger than the cross-sectional area of the reinforcing rib 3112.

[0067] Radially along the second punching sheet 31, from the center of the second punching sheet 31 outwards, the second cooling holes 311 are, in sequence, inner spray holes 3113, reinforcing ribs 3112, and outer spray holes 3111. The cross-sectional area of the outer spray holes 3111 is larger than the cross-sectional area of the reinforcing ribs 3112, and the cross-sectional area of the inner spray holes 3113 is larger than the cross-sectional area of the reinforcing ribs 3112. The cross-sectional area of the outer spray holes 3111 may be equal to the cross-sectional area of the inner spray holes 3113 or may not be equal.

[0068] In the technical solution of the above embodiment, the reinforcing ribs 3112 are arranged in the second cooling holes 311, which can improve the structural strength of the second cooling holes 311. In the second cooling holes 311, the reinforcing ribs 3112 divide the second cooling holes 311 into outer spray holes 3111 and inner spray holes 3113, which can form a double-layer spraying of the coolant to ensure the reliability of the coolant spraying.

[0069] In some embodiments of the present application, as Figures 11 to 15 shown, the second punching sheet group 3 includes three second punching sheets 31. The included angle between adjacent second cooling holes 311 on the second punching sheet 31 is R, and three adjacent second cooling holes 311 form a hole group. As an implementation scheme, along the clockwise direction within the hole group, the distances between the three second cooling holes 311 and the axis of the second punching sheet 31 gradually decrease. The three second punching sheets 31 are coaxially stacked. From the first punching sheet 11 to the second punching sheet 31, the adjacent second punching sheets 31 are sequentially twisted counterclockwise around the axis by an angle of n times R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3. As another implementation scheme, along the clockwise direction within the hole group, the distances between the three second cooling holes 311 and the axis of the second punching sheet 31 gradually increase. The three second punching sheets 31 are coaxially stacked. From the first punching sheet 11 to the second punching sheet 31, the adjacent second punching sheets 31 are sequentially twisted clockwise around the axis by an angle of n times R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3.

[0070] When n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3, for example, n can be 1, 4, 7, 10, 13, 16, etc.

[0071] When, along the clockwise direction within the hole group, the distances between the three second cooling holes 311 and the axis of the second punching sheet 31 gradually decrease, from the first punching sheet 11 to the second punching sheet 31 direction, the second punching sheet 31 is sequentially twisted counterclockwise by an angle of n times R. It can be considered that the first second cooling hole 311 in the first second punching sheet 31 hole group is communicated with the second second cooling hole 311 in the second second punching sheet 31 hole group and is also communicated with the third second cooling hole 311 in the third second punching sheet 31 hole group.

[0072] When the distances between the three second cooling holes 311 and the axis of the second punching sheet 31 gradually increase in the clockwise direction within the hole group, the second punching sheet 31 is sequentially twisted clockwise by an angle that is n times R from the first punching sheet 11 towards the second punching sheet 31. It can be considered that the third second cooling hole 311 in the hole group of the first second punching sheet 31 is connected to the second second cooling hole 311 in the hole group of the second second punching sheet 31 and is also connected to the first second cooling hole 311 in the hole group of the third second punching sheet 31.

[0073] All the second cooling holes 311 in the three second punching sheets 31 together form three types of hole patterns, as Figure 15 shown. The first type of hole pattern slopes downward from the first punching sheet 11 towards the second punching sheet 31 and faces the winding; as Figure 13 shown, the second type of hole pattern is V-shaped; as Figure 14 shown, the third type of hole pattern is an inverted V-shaped. The quantities of the three types of hole patterns are equal, and they are all distributed in a circumferential array around the axis of the second punching sheet 31.

[0074] In the technical solution of the above embodiment, among the three types of hole patterns formed, two types (the first type and the third type) of hole patterns can cause the coolant to form a liquid column spraying towards the winding, thereby realizing the cooling of the stator winding 5.

[0075] In some embodiments of the present application, as Figure 7 and Figure 8 shown, it further includes a third punching sheet group 2. The third punching sheet group 2 includes at least one third punching sheet 21. The third punching sheet group 2 is coaxially stacked between the first punching sheet 11 and the second punching sheet 31; a plurality of third cooling holes 211 are distributed in a circumferential array around the axis on the third punching sheet 21, and the third cooling holes 211 penetrate through the two end faces of the third punching sheet 21; the quantity ratio of the third cooling holes 211 to the second cooling holes 311 is 1:3.

[0076] The quantity ratio of the third cooling holes 211 on the third punching sheet 21 to the second cooling holes 311 on the second punching sheet 31 is 1:3. That is to say, among every three second cooling holes 311, two second cooling holes 311 are blocked by the third punching sheet 21. Specifically, among the above three types of hole patterns, the second type and the third type of hole patterns are both blocked by the third punching sheet 21, and only the first type of hole pattern (as Figure 15 shown, the hole pattern with the path facing the stator winding 5 among the hole patterns formed by a plurality of second cooling holes 311) is connected to the first cooling hole 112 through the third cooling holes 211.

[0077] In the technical solution of the above embodiment, by providing the third punching sheet 21 to block two of the three types of hole patterns formed by the second punching sheet 31, the flow path of the coolant can be adjusted, so that a coolant flow path can be formed in the stator core to sequentially cool the first punching sheet 11, the third punching sheet 21 and the second punching sheet 31, and spray liquid to cool the stator winding 5.

[0078] In some embodiments of the present application, as Figure 8 shown, a plurality of winding slots 4 are circumferentially and arrayed around the axis on the first punching sheet 11, the second punching sheet 31, and the third punching sheet 21; among the hole patterns formed by the plurality of second cooling holes 311, the ratio of the number of hole patterns (the above-mentioned first type of hole pattern) whose paths face the winding slots 4 to the number of winding slots 4 is greater than 1:2.

[0079] Exemplarily, the ratio of the number of the first type of hole pattern to the number of winding slots 4 can be 2:3, 3:4, 4:5, 5:6, 1:1, or any intermediate ratio value between any two adjacent ratio values above.

[0080] Exemplarily, the number of the first type of hole pattern can be 36, the number of winding slots 4 can be 54, and the ratio between the two is 2:3. The number of the first cooling holes 112 on the first punching sheet 11 can be 72, the number of the second cooling holes 311 on the second punching sheet 31 can be 108, and the number of the third cooling holes 211 on the third punching sheet 21 can be 36.

[0081] In the technical solution of the above embodiment, the ratio of the number of the second type of hole pattern to the number of winding slots 4 is greater than 1:2 (for example, 2:3), which can improve the coverage rate when the coolant sprays on the winding, and thus improve the cooling effect of the stator winding 5.

[0082] In some embodiments of the present application, as Figure 8 shown, the cross-sectional area of the first cooling hole 112 is larger than the cross-sectional area of the third cooling hole 211, and the cross-sectional area of the third cooling hole 211 is larger than the cross-sectional area of the second cooling hole 311.

[0083] The cross-sectional area of the first cooling hole 112 refers to the area of a single first cooling hole 112 on the end face of the first punching sheet 11, the cross-sectional area of the second cooling hole 311 refers to the area of a single second cooling hole 311 on the end face of the second punching sheet 31, and the cross-sectional area of the third cooling hole 211 refers to the area of a single third cooling hole 211 on the end face of the third punching sheet 21.

[0084] Exemplarily, the cross-sections of the first cooling hole 112, the second cooling hole 311, and the third cooling hole 211 can be any one of a circle, an ellipse, a rectangle, a square, a parallelogram, a trapezoid, or any combination thereof.

[0085] In the technical solution of the above embodiment, along the flow direction of the coolant (from the first cooling hole 112 to the third cooling hole 211, and then to the second cooling hole 311), the cross-sectional area of the channel decreases in sequence, so that the pressure of the coolant increases in sequence during flow, and the flow rate increases in sequence, thereby ensuring the outward spraying effect at the second cooling hole 311.

[0086] In some embodiments of the present application, as Figure 8 shown, a plurality of first welding grooves are circumferentially arranged around the axis on the first punching sheet 11. The first welding grooves include a first welding main groove 113 and a first welding sub-groove 114. The first welding main grooves 113 and the first welding sub-grooves 114 of two adjacent first punching sheets 11 are located on a first straight line. A plurality of third welding grooves 212 are circumferentially arranged around the axis on the third punching sheet 21. The width of the third welding groove 212 is greater than the width of the first welding groove. Adjacent third welding grooves 212 and the first welding main groove 113 or the first welding sub-groove 114 are located on a second straight line. As Figure 10 shown, a plurality of second welding grooves are circumferentially arranged around the axis on the second punching sheet 31. The second welding grooves include a second welding main groove 312, a second welding sub-groove 313 and a second welding auxiliary groove 314. In the second punching sheet group 3, the second welding main grooves 312, the second welding sub-grooves 313 and the second welding auxiliary grooves 314 of three adjacent second punching sheets 31 are located on a third straight line. The numbers of the first welding grooves, the second welding grooves and the third welding grooves 212 are the same, and the first straight line, the second straight line and the third straight line coincide.

[0087] The first welding main groove 113 and the first welding sub-groove 114 are both welding grooves formed by the circumferential surface of the first punching sheet 11 recessing inwards but not contacting the first cooling hole 112 and the liquid inlet groove 111. The third welding groove 212 is a welding groove formed by the circumferential surface of the third punching sheet 21 recessing inwards but not contacting the third cooling hole 211. The second welding groove is a welding groove formed by the circumferential surface of the second punching sheet 31 recessing inwards but not contacting the second cooling hole 311.

[0088] The first welding grooves include the first welding main groove 113 and the first welding sub-groove 114, which can make the welding grooves on adjacent first punching sheets 11 be on a first straight line. The second welding grooves include the second welding main groove 312, the second welding sub-groove 313 and the second welding auxiliary groove 314, which can make the welding grooves on adjacent second punching sheets 31 be on a third straight line. The width of the third welding groove 212 is greater than the width of the first welding groove, which can match the first welding groove (adjacent third welding grooves 212 and the first welding main groove 113 or the first welding sub-groove 114 are located on a second straight line), and reduce the number of slots on the third punching sheet 21.

[0089] Exemplarily, as Figure 7As shown, the first welding groove, the second welding groove, and the third welding groove 212 can each be eight in number, forming eight weld seams.

[0090] In the technical solution of the above embodiment, the first straight line, the second straight line, and the third straight line coincide. Thus, the first punching piece 11, the third punching piece 21, and the second punching piece 31 can be integrally welded, reducing the welding cost and improving the connection strength. In addition, the first welding groove includes a first main welding groove 113 and a first sub-welding groove 114; the second welding groove includes a second main welding groove 312, a second sub-welding groove 313, and a second auxiliary welding groove 314; the width of the third welding groove 212 is greater than that of the first welding groove. Corresponding welding grooves can be selected according to the requirements of integral welding, thereby reducing the mold opening cost of the first punching piece 11, the second punching piece 31, and the third punching piece 21.

[0091] Please refer to Figure 16 and Figure 17 , Figure 16 which is a schematic structural diagram of a stator according to some embodiments of the present application; Figure 17 which is a schematic structural diagram of a housing according to some embodiments of the present application.

[0092] In a third aspect, as Figure 16 shown, some embodiments of the present application provide a stator. Since the stator includes a stator core, the stator has all the beneficial effects of the stator core in the above embodiments.

[0093] In some embodiments of the present application, as Figure 16 and Figure 17 shown, the stator includes a housing 6, a stator winding 5, and a stator core; the stator core is installed in the housing 6, and the stator winding 5 is installed on the stator core; the housing 6 is provided with a liquid inlet 61 and an annular groove 62, and the annular groove 62 is communicated with the liquid inlet 61 and a plurality of liquid inlet grooves 111.

[0094] When the stator core is installed in the housing 6, the annular groove 62 provided in the housing 6 can be communicated with the liquid inlet groove 111 on the stator core. External coolant enters the annular groove 62 from the liquid inlet 61, enters the liquid inlet groove 111 from the annular groove 62, and is sprayed onto the part of the stator winding 5 protruding from the two end faces of the stator core after passing through the first cooling hole 112, the third cooling hole 211, and the second cooling hole 311 in sequence.

[0095] Exemplarily, the axis of the annular groove 62 can coincide with the axis of the housing 6, which is convenient for the processing of the annular groove 62. The axis of the annular groove 62 can be arranged parallel to the axis of the housing 6 (not coincident), and thus a differential setting can be performed in the circumferential direction of the stator core.

[0096] Exemplarily, the annular groove 62 may be located outside the circumference of a first punching sheet 11 and communicate with all the liquid inlet grooves 111 on the first punching sheet 11. The annular groove 62 may be located outside the circumferences of a plurality of first punching sheets 11 and communicate with all the liquid inlet grooves 111 on the plurality of first punching sheets 11. The annular groove 62 may also be located outside the circumferences of two adjacent first punching sheets 11, at the junction of the two adjacent first punching sheets 11, and communicate with all the liquid inlet grooves 111 on the two first punching sheets 11.

[0097] Exemplarily, the number of the annular grooves 62 may be one or more. When there are a plurality of annular grooves 62, the plurality of annular grooves 62 may be arranged in parallel or intersect with each other. The liquid inlet 61 may communicate with the plurality of annular grooves 62 at the intersection or communicate with the plurality of annular grooves 62 respectively.

[0098] In the technical solution of the above embodiment, the annular groove 62 is provided on the housing 6 and can communicate with all the liquid inlet grooves 111 on at least one first punching sheet 11, increasing the flow rate of the coolant entering the stator core and ensuring the circumferential cooling balance of the stator core.

[0099] Fourthly, some embodiments of the present application provide a motor, and the motor includes the stator in any of the above embodiments.

[0100] The motor provided in the embodiments of the present application has all the beneficial effects of the stator in the foregoing third aspect embodiments. For the specific description of the stator, reference may be made to the above embodiments, and details are not described herein again.

[0101] As described above, the above is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, modules, and units can refer to the corresponding processes in the foregoing method embodiments, and details are not described herein again. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should all be covered within the protection scope of the present application.

Claims

1. A stator punching sheet, characterized in that, Comprising: A first punching sheet, on which a plurality of first cooling holes are circumferentially arrayed around its own axis, each of the first cooling holes penetrating through two end faces of the first punching sheet, and the interval between adjacent first cooling holes being smaller than the length of the first cooling holes; A plurality of liquid inlet grooves are distributed on the first punching sheet, each of the liquid inlet grooves being recessed from the outer peripheral surface of the first punching sheet towards the inside and communicating with some of the first cooling holes.

2. The stator punching sheet according to claim 1, characterized in that, The plurality of liquid inlet grooves are circumferentially arrayed along the circumference of the first punching sheet, and each of the liquid inlet grooves communicates with a plurality of adjacent first cooling holes.

3. The stator punching sheet according to claim 1, wherein, The number of the liquid inlet grooves accounts for one-sixth to one-twelfth of the number of the first cooling holes.

4. A stator core, characterized in that, Comprising: A second punching sheet group and the stator punching sheet according to any one of claims 1 to 3; There are a plurality of the first punching sheets, and the plurality of first punching sheets are coaxially stacked, with adjacent first punching sheets being arranged with a stagger around the axis, so that all the first cooling holes of adjacent first punching sheets partially overlap to form a cooling channel; The second punching sheet group is arranged in pairs and coaxially stacked with the first punching sheets at two ends formed by the coaxial stacking of the plurality of first punching sheets respectively. The second punching sheet group includes second punching sheets, on which a plurality of second cooling holes are circumferentially arrayed around the axis, the second cooling holes penetrating through two end faces of the second punching sheet, and at least some of the second cooling holes communicating with some of the first cooling holes.

5. The stator core according to claim 4, characterized in that, The liquid inlet grooves of adjacent first punching sheets correspond to each other one by one, and the corresponding liquid inlet grooves partially overlap.

6. The stator core according to claim 4, characterized in that, The second cooling holes include outer spray holes, reinforcing ribs and inner spray holes, the reinforcing ribs being located between the outer spray holes and the inner spray holes, and the inner spray holes being located between the axis of the second punching sheet and the outer spray holes; The cross-sectional areas of both the outer spray holes and the inner spray holes are larger than the cross-sectional area of the reinforcing ribs.

7. The stator core according to claim 4, characterized in that, The second punching sheet group includes three second punching sheets, and the included angle between adjacent second cooling holes on the second punching sheet is R, and adjacent three second cooling holes form a hole group; In the hole group, along the clockwise direction, the distances between the three second cooling holes and the axis of the second punching sheet gradually decrease. The three second punching sheets are coaxially stacked, and from the first punching sheet to the second punching sheet, adjacent second punching sheets are sequentially twisted around the axis counterclockwise by an angle of n times R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3; or In the hole group, along the clockwise direction, the distances between the three second cooling holes and the axis of the second punching sheet gradually increase. The three second punching sheets are coaxially stacked, and from the first punching sheet to the second punching sheet, adjacent second punching sheets are sequentially twisted around the axis clockwise by an angle of n times R, where n is any number in an arithmetic sequence with the first term being 1 and the common difference being 3.

8. The stator core according to claim 4, characterized in that, It further includes a third punching sheet group, the third punching sheet group including at least one third punching sheet, and the third punching sheet group being coaxially stacked between the first punching sheet and the second punching sheet; The third punching sheet is circumferentially arrayed around the axis with a plurality of third cooling holes, and the third cooling holes penetrate through two end faces of the third punching sheet; The ratio of the number of the third cooling holes to the number of the second cooling holes is 1:3, and is used to communicate the hole patterns with paths facing the stator winding among the hole patterns formed by the plurality of the second cooling holes with at least part of the first cooling holes.

9. The stator core according to claim 8, wherein A plurality of winding slots are circumferentially arrayed around the axis on the first punching sheet, the second punching sheet, and the third punching sheet; Among the hole patterns formed by the plurality of the second cooling holes, the ratio of the number of the hole patterns with paths facing the winding slots to the number of the winding slots is greater than 1:

2.

10. The stator core according to claim 8, characterized in that, The cross-sectional area of the first cooling holes is greater than that of the third cooling holes, and the cross-sectional area of the third cooling holes is greater than that of the second cooling holes.

11. The stator core according to claim 8, characterized in that, A plurality of first welding slots are circumferentially arrayed around the axis on the first punching sheet. The first welding slots include first main welding slots and first sub-welding slots. The first main welding slots and the first sub-welding slots of two adjacent first punching sheets are located on a first straight line; A plurality of third welding slots are circumferentially arrayed around the axis on the third punching sheet. The width of the third welding slots is greater than that of the first welding slots. The adjacent third welding slots and the first main welding slots or the first sub-welding slots are located on a second straight line; A plurality of second welding slots are circumferentially arrayed around the axis on the second punching sheet. The second welding slots include second main welding slots, second sub-welding slots, and second auxiliary welding slots. In the second punching sheet group, the second main welding slots, the second sub-welding slots, and the second auxiliary welding slots of three adjacent second punching sheets are located on a third straight line; The number of the first welding slots, the second welding slots, and the third welding slots is the same, and the first straight line, the second straight line, and the third straight line coincide.

12. A stator, characterized in that, Comprising: a housing, a stator winding, and a stator core according to any one of claims 4 to 11; The stator core is installed in the housing, and the stator winding is installed on the stator core; The housing is provided with a liquid inlet and an annular groove, and the annular groove is communicated with the liquid inlet and a plurality of the liquid inlet grooves.

13. A motor, characterized in that, Comprising a stator according to claim 12.

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