Motor stator core, motor stator, motor and automobile

Abstract

The utility model provides a motor stator core, a motor stator, a motor and an automobile. The motor stator core comprises a first punching sheet and a second punching sheet, and a plurality of first welding grooves are arranged along the circumferential direction of the first punching sheet; a plurality of protrusions are arranged in the circumferential direction of the second punching sheet, and second welding grooves are formed in the ends of the protrusions. Wherein the plurality of second punching sheets are coaxially stacked together to form a middle laminated layer, the middle laminated layer is coaxially stacked among the plurality of first punching sheets, the positions of the first welding grooves correspond to the positions of the second welding grooves, and the first welding grooves and the second welding grooves which correspond to each other jointly form a straight welding bead. The farthest distance between the end portion of the protrusion and the center of the second punching sheet is smaller than the distance between the periphery of the first punching sheet and the center of the second punching sheet. According to the technical scheme, the influence of the middle laminated layer on the electromagnetic performance and the NVH performance of the motor during segmented welding can be avoided, the condition of oil leakage is avoided, and the cooling effect is further guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and particularly to a motor stator core, a motor stator, a motor and an automobile. Background Art

[0002] The application of high-speed and high-efficiency motors has received increasing attention. While the performance of the motor has been greatly improved, the huge heat generated by the motor stator winding and core will seriously affect the motor performance. In the long run, it will also lead to an irreversible demagnetization phenomenon of the motor. Therefore, a reasonable motor cooling design scheme can not only increase the motor heat exchange efficiency, but also increase the power density of the motor under the same specifications, thereby improving the working efficiency of the motor, extending the service life cycle, and greatly saving the later maintenance cost of the motor. For high-voltage platform motors, generally, the motor cooling is achieved by exchanging heat with cooling oil.

[0003] In the prior art, the loop design of the cooling oil is to introduce oil from the middle lamination of the stator core and discharge oil at both ends of the stator. The spray rings at both ends of the stator will directly spray the cooling oil on the stator winding wire package to achieve the stator cooling effect. This structure requires the housing and the middle lamination to cooperate to form a cavity, and the outer diameter of the middle lamination should be smaller than that of other laminations to reserve an oil chamber, so that the cooling oil can enter the oil grooves of other laminations from the oil chamber and then cool the stator core.

[0004] However, when welding this kind of stator core, the weld bead of the middle lamination cannot be welded together with other laminations, and it needs to be welded in sections, which increases the process cost and this kind of sectional welding affects the NVH performance and electromagnetic performance of the motor. The sectional welding may affect the overall rigidity of the stator core. There may be slight discontinuities or local stress concentrations between different welding sections, which may all become the sources of vibration and be converted into additional noise and vibration during motor operation; in particular, if the welding areas cannot be perfectly aligned or there are slight misalignments, local vibrations may be caused during operation, affecting the NVH (noise, vibration and harshness) performance. The sectional welding of the stator core may also cause slight interference to the magnetic circuit of the motor; the discontinuity of the welding area may affect the uniform distribution of magnetic flux, resulting in an increase in local magnetic resistance or magnetic saturation phenomenon, thereby affecting the efficiency, torque output and heating condition of the motor. There may also be oil leakage inside the stator. The sectional welding may leave tiny gaps or holes in the welding area, and these defects can become the channels for oil leakage; especially in a high-pressure cooling system, any slight leakage will affect the efficiency of oil circulation and cooling capacity. In addition, since the flow channel at the middle lamination of the stator core is a continuous annular through oil channel, it cannot ensure that a certain amount of oil flows out of each oil groove, and the cooling effect cannot be guaranteed. Summary of the Utility Model

[0005] The objective of the embodiments of the present application is to provide a motor stator core, a motor stator, a motor, and an automobile, so as to avoid the influence of the middle lamination during segmented welding on the electromagnetic performance and NVH performance of the motor and avoid oil leakage, and further ensure the cooling effect.

[0006] To solve the above technical problems, the embodiments of the present application provide the following technical solutions:

[0007] The first aspect of the present application provides a motor stator core, including:

[0008] A first punching sheet, on the circumferential direction of which there are a plurality of oil grooves, and on the circumferential edge of which there are a plurality of first welding grooves evenly spaced; and

[0009] A second punching sheet, on the circumferential edge of which there are a plurality of protrusions protruding evenly and outward, and at the end of which there is a second welding groove;

[0010] Wherein, a plurality of the first punching sheets are coaxially stacked together in the thickness direction to form a first lamination, a plurality of the second punching sheets are coaxially stacked together in the thickness direction to form a middle lamination, the protrusions of the plurality of the second punching sheets are arranged corresponding to each other up and down, the middle lamination is coaxially stacked in the middle of the plurality of the first laminations in the thickness direction, the edge of the middle lamination does not exceed the position corresponding to the oil groove, the positions of the first welding groove and the second welding groove correspond to each other, and the corresponding first welding groove and second welding groove jointly form a straight welding bead, and the distance from the end of the protrusion to the center of the second punching sheet is less than the distance from the edge of the first punching sheet to the center of the first punching sheet.

[0011] In some alternative embodiments of the first aspect of the present application, the cross-section of the protrusion parallel to the second punching sheet is trapezoid-like, the trapezoid-like shape gradually narrows from the side close to the second punching sheet to the side far from the second punching sheet, and the side of the trapezoid-like shape far from the second punching sheet is arc-shaped.

[0012] In some alternative embodiments of the first aspect of the present application, a plurality of the oil grooves are evenly arranged between two adjacent first welding grooves.

[0013] In some alternative embodiments of the first aspect of the present application, the thickness of the middle lamination accounts for 4%-5% of the total thickness of the stacked first punching sheet and second punching sheet.

[0014] The second aspect of the present application provides a motor stator, including the above-mentioned motor stator core and a housing, and the housing is installed on the outside of the motor stator core.

[0015] In some alternative embodiments of the second aspect of the present application, an annular groove is provided on the inner wall of the housing at the position corresponding to the second punching sheet.

[0016] In some modified embodiments of the second aspect of the present application, an oil inlet and an oil outlet are further provided on the annular groove, and the oil inlet and the oil outlet are arranged at opposite positions on the annular groove.

[0017] In some modified embodiments of the second aspect of the present application, the oil inlet is directly opposite to any one of the protrusions.

[0018] The third aspect of the present application provides a motor, including the above-mentioned motor stator.

[0019] The fourth aspect of the present application provides a vehicle, including the above-mentioned motor.

[0020] Compared with the prior art, for the motor stator core provided in the first aspect of the present application, by circumferentially arranging a plurality of protrusions on the outer periphery of the second punching sheet, and arranging a second welding groove on the side of the protrusion away from the second punching sheet; thereby enabling the corresponding first welding groove and the second welding groove to jointly form a straight welding bead, so that the first punching sheet and the second punching sheet can be integrally welded, thereby avoiding the influence of the middle lamination on the electromagnetic performance and NVH performance of the motor during segmented welding, and also avoiding oil leakage. In addition, circumferentially arranging a plurality of protrusions on the outer periphery of the second punching sheet also divides the continuous annular through oil passage at the corresponding position into multiple intermediate flow channels. By setting the maximum distance between the protrusion and the center of the second punching sheet to be less than half of the outer diameter of the first punching sheet, there is a gap between the protrusion and the housing, so that when injecting oil, the housing will enter the next intermediate flow channel from the gap under the action of oil pressure only after being filled from one intermediate flow channel, thereby ensuring that a certain amount of oil flows out from the oil tank, and further ensuring the cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the exemplary embodiments of the present application will become readily understood. In the drawings, several embodiments of the present application are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0022] Figure 1 Schematically shows a structural diagram of a motor stator core;

[0023] Figure 2 Schematically shows a structural diagram of the punching sheet stack of a motor stator core;

[0024] Figure 3 Schematically shows Figure 1 a partially enlarged structural diagram of part A of a motor stator core in;

[0025] Figure 4 Schematically shows a structural diagram of the first punching sheet of a motor stator core;

[0026] Figure 5 Schematically shows Figure 4 The enlarged partial structure diagram of part B of the first punching piece in

[0027] Figure 6 Schematically shows the structure diagram of the second punching piece of a motor stator core;

[0028] Figure 7 Schematically shows Figure 6 The enlarged partial structure diagram of part C of the second punching piece in

[0029] Figure 8 Schematically shows the cross-sectional view of a motor stator;

[0030] Figure 9 Schematically shows the partial structure diagram of a motor stator.

[0031] Figure 10 Schematically shows the structure diagram of another protrusion;

[0032] Figure 11 Schematically shows the stacking diagram of multiple first punching pieces in the first stack;

[0033] Figure 12 Schematically shows the stacking diagram of multiple second punching pieces in the middle stack.

[0034] Explanation of the reference numerals in the attached drawings:

[0035] 1. First stack; 11. First punching piece; 111. First welding groove; 112. Oil groove; 113. Tooth groove; 2. Middle stack; 21. Second punching piece; 211. Protrusion; 212. Second welding groove; 213. Punching piece main body; 3. Housing; 31. Annular groove; 32. Oil inlet; 33. Oil outlet; 34. Oil inlet channel; 4. Middle flow channel; L1. First distance; L2. Second distance. Detailed implementation manners

[0036] The following further describes the implementation manners of the present application in detail in conjunction with the drawings and embodiments. The detailed description and drawings of the following embodiments are used to exemplarily illustrate the principle of the present application, but cannot be used to limit the scope of the present application. The present application can be implemented in many different forms, not limited to the specific embodiments described in the text, but including all technical solutions falling within the scope of the claims.

[0037] These embodiments are provided in this application to make the application thorough and complete, and to fully convey the scope of the application to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0038] It should be noted that in the description of this application, unless otherwise specified, the meaning of "a plurality" is greater than or equal to two; the orientation or positional relationships indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", etc. are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as a limitation to this application. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0039] In addition, the "first", "second" and similar terms used in this application do not denote any order, quantity or importance, but are only used to distinguish different parts. "Vertical" is not strictly vertical, but within the allowable error range. "Parallel" is not strictly parallel, but within the allowable error range. Words such as "comprising" or "including" mean that the elements before this word cover the elements listed after this word, and do not exclude the possibility of also covering other elements.

[0040] It should also be noted that in the description of this application, unless otherwise clearly defined and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. When it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0041] All terms used in this application have the same meanings as those understood by those of ordinary skill in the art to which this application belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries should be interpreted as having meanings consistent with their meanings in the context of the relevant art, and should not be interpreted in an idealized or overly formal sense, unless specifically defined as such here.

[0042] Technologies, methods and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods and devices should be regarded as part of the specification.

[0043] In the prior art, the loop design of the cooling oil is to introduce oil from the middle lamination of the stator core and discharge it at both ends of the stator. The spray rings at both ends of the stator will directly spray the cooling oil on the stator winding coil to achieve the stator cooling effect. This structure requires the housing to cooperate with the middle lamination to form a cavity, and the outer diameter of the middle lamination should be smaller than that of other laminations to reserve an oil chamber.

[0044] However, when welding this kind of stator core, the weld bead of the middle lamination cannot be welded together with other laminations and needs to be welded in sections, which increases the process cost. Moreover, this kind of sectional welding affects the NVH performance and electromagnetic performance of the motor. Sectional welding may cause the overall rigidity of the stator core to be affected. There may be slight discontinuities or local stress concentrations between different welding sections, which may all become the sources of vibration and be converted into additional noise and vibration during motor operation. In particular, if the welding areas cannot be perfectly aligned or there are slight misalignments, local vibrations may be induced during operation, affecting the NVH (noise, vibration, and harshness) performance. The sectional welding of the stator core may also cause slight interference to the magnetic circuit of the motor. The discontinuity of the welding area may affect the uniform distribution of magnetic flux, resulting in an increase in local magnetic resistance or magnetic saturation, thereby affecting the efficiency, torque output, and heating condition of the motor. There may also be oil leakage inside the stator. Sectional welding may leave slight gaps or holes in the welding area, and these defects can become channels for oil leakage. Especially in a high-pressure cooling system, any slight leakage will affect the efficiency of oil circulation and cooling capacity. In addition, since the flow channel at the middle lamination of the stator core is a continuous annular through-flow oil channel, it cannot ensure that a certain amount of oil flows out of each oil groove, and the cooling effect cannot be guaranteed.

[0045] To solve the above technical problems, the present application proposes a motor stator core, a motor stator, a motor, and an automobile to avoid the influence of the middle lamination on the electromagnetic performance and NVH performance of the motor and the oil leakage during sectional welding, and further ensure the cooling effect.

[0046] Embodiment 1

[0047] As Figure 1 、 Figure 2 and Figure 3 shown, a motor stator core includes a first punching sheet 11 and a second punching sheet 21. A plurality of oil grooves 112 are circumferentially arranged on the first punching sheet 11, and a plurality of first welding grooves 111 are evenly spaced on the circumferential edge of the first punching sheet 11; a plurality of protrusions 211 are evenly spaced and protrude outward on the circumferential edge of the second punching sheet 21, and second welding grooves 212 are arranged at the ends of the protrusions 211;

[0048] As Figure 11 shown, a plurality of the first punching sheets 11 are coaxially stacked together in the thickness direction to form a first lamination 1; AsFigure 12 As shown, a plurality of the second punching sheets 21 are coaxially stacked together in the thickness direction to form an intermediate stack 2. The protrusions 211 of the plurality of the second punching sheets are arranged corresponding to each other up and down. The intermediate stack 2 is coaxially stacked in the middle of a plurality of the first stacks 1 in the thickness direction. The edge of the intermediate stack 2 does not exceed the position of the oil groove 112. The positions of the first welding groove 111 and the second welding groove 212 correspond to each other. The corresponding first welding groove 111 and the second welding groove 212 together form a straight welding bead. The distance from the end of the protrusion 211 to the center of the second punching sheet 21 is less than the distance from the edge of the first punching sheet 11 to the center of the first punching sheet 11.

[0049] Specifically, as Figure 6 shown, the end of the protrusion 211 is the side where the protrusion 211 is far from the second punching sheet. By arranging the second welding groove 212 at the end of the protrusion 211, the second welding groove 212 of the second punching sheet can extend out from the intermediate stack 2 and then align with the first welding groove 111 of the first punching sheet 11 to form a complete welding bead.

[0050] More specifically, as Figure 4 and Figure 6 shown, the distance from the end of the protrusion 211 to the center of the second punching sheet 21 is the first distance L1, and the distance from the edge of the first punching sheet 11 to the center of the first punching sheet 11 is the second distance L2. The first distance L1 is less than the second distance L2, so that there is a gap between the protrusion 211 and the housing 3, allowing the cooling oil to flow through this gap, so that the cooling oil can flow between different protrusions 211 and then fill all the oil grooves 112.

[0051] More specifically, the first punching sheet 11 refers to a metal sheet made by a stamping process, and they are the basic components of the motor stator core. As Figure 4 and Figure 5 shown, the first punching sheet 11 is a circular punching sheet, which is composed of tooth grooves 113, oil grooves 112 and first welding grooves 111. The oil grooves 112 are located at the stator jaw, that is, the edge of the first punching sheet 11, and are arranged radially along the stator center. More specifically, 45 oil grooves 112 can be provided, and a plurality of the first punching sheets 11 are stacked to form 45 oil channels penetrating through the intermediate stack 2. More specifically, the first punching sheet 11 can be made of electrical steel sheet, which has the characteristics of low iron loss and high magnetic permeability. In order to reduce eddy current loss, an insulating layer can also be coated on the surface of the punching sheet. As long as the first punching sheet 11 can cooperate with the second punching sheet 21 to stack into the motor stator core, the structure and shape of the first punching sheet 11 are not specifically limited.

[0052] The second punching sheet 21 also refers to a metal sheet made by a punching process. The second punching sheet 21 can be stacked with the first punching sheet 11 to form a stator core. Specifically, as Figure 6 shown, the second punching sheet 21 is a circular punching sheet, which is composed of a punching sheet body 213 and a protrusion 211. Tooth grooves are also provided on the punching sheet body 213, and the tooth grooves of the second punching sheet 21 correspond to the tooth grooves 113 of the first punching sheet 11. The outer diameter of the punching sheet body 213 is smaller than that of the first punching sheet 11, and the outer edge of the punching sheet body 213 does not exceed the position of the oil groove 112 in the corresponding first punching sheet 11, so that the second punching sheet 21 and the housing 3 cooperate to form a channel for the cooling oil to flow, and the cooling oil enters the oil groove 112. Similarly, the second punching sheet 21 can be made of electrical silicon steel sheet, and this material has the characteristics of low iron loss and high magnetic permeability. In order to reduce eddy current loss, an insulating layer can also be coated on the surface of the punching sheet. As long as the second punching sheet 21 can be stacked with the first punching sheet 11 to form a motor stator core, the specific structure and shape of the second punching sheet 21 are not specifically limited.

[0053] As Figure 6 , Figure 7 and Figure 10 shown, the protrusion 211 refers to a structure protruding from the outer periphery of the second punching sheet 21; specifically, the protrusion 211 can be a trapezoidal structure, a rectangular structure or a semi-circular ring structure. As long as a plurality of protrusions 211 can be stacked to block the flow of the cooling oil, and a second welding groove 22 is provided at its end, the specific structure of the protrusion 211 is not limited. More specifically, as Figure 1 and Figure 2 shown, a plurality of second punching sheets 21 are stacked to form an intermediate stack 2, and the protrusions 211 of the second punching sheets 21 are stacked into bumps to temporarily block the flow of the cooling oil and thus divide the continuous flow channel into a plurality of intermediate flow channels 4.

[0054] Compared with the prior art, for the motor stator core provided in the present application, a plurality of protrusions 211 are circumferentially arranged on the outer periphery of the second punching sheet 21, and a second welding groove 22 is arranged on the side of the protrusion 211 away from the second punching sheet 21; thus, the corresponding first welding groove 111 and the second welding groove 22 can jointly form a straight welding bead, so that the first punching sheet 11 and the second punching sheet 21 can be integrally welded, thereby avoiding the influence of the middle lamination 2 on the electromagnetic performance and NVH performance of the motor during segmented welding, and also avoiding oil leakage. In addition, a plurality of protrusions 211 are circumferentially arranged on the outer periphery of the second punching sheet 21, and the continuous annular through oil passage at its corresponding position is divided into multiple intermediate flow channels 4. By setting the maximum distance from the end of the protrusion 211 to the center of the second punching sheet 21 to be less than the distance from the edge of the first punching sheet 11 to the center of the first punching sheet 11, there is a gap between the protrusion 211 and the housing 3, so that when injecting oil, after the housing 3 is filled from one intermediate flow channel 4, it will enter the next intermediate flow channel 4 from the gap under the action of oil pressure, thereby ensuring that a certain amount of oil flows out from the oil groove 112, further ensuring the cooling effect.

[0055] In some modified embodiments of the present application, such as Figure 10 shown, the cross-section of the protrusion 211 parallel to the second punching sheet 211 is trapezoid-like, and the trapezoid-like shape gradually narrows from the side close to the second punching sheet 211 to the side away from the second punching sheet 211, and the side edge of the trapezoid-like shape away from the second punching sheet 211 is arc-shaped. Specifically, the cross-section of the protrusion 211 parallel to the second punching sheet 21 can be a right trapezoid, an irregular trapezoid, or an isosceles trapezoid, so as to reduce the flow resistance when the cooling oil passes through the protrusion 211. In addition, the structure of the trapezoidal protrusion 211 is simpler, easier to punch and manufacture, and reduces the production cost. More specifically, the connection between the protrusion 211 and the punching sheet and the connections between both sides of the protrusion 211 and the end of the protrusion 211 can be arc-connected, so as to further reduce the flow resistance when the cooling oil passes through the protrusion 211. On the other hand, the end of the second punching sheet 21 is set to be arc-shaped to match the shape of the housing 3, so as to further reduce the flow resistance, reduce the pressure required to pump the cooling oil, and thus reduce the cost.

[0056] In some modified embodiments of the present application, a plurality of protrusions 211 are evenly distributed along the circumferential direction of the second punching piece 21. By evenly distributing the plurality of protrusions 211 along the circumferential direction of the second punching piece 21, the continuous annular through oil passage is evenly divided into multiple intermediate flow passages 4, thereby enhancing the cooling uniformity. Specifically, 9 protrusions 211 can be provided, so that the continuous annular through oil passage is evenly divided into 9 intermediate flow passages 4, and 5 oil grooves 112 are provided at the positions of the first punching piece 11 corresponding to each intermediate flow passage 4, for a total of 45 oil grooves 112. As long as the plurality of protrusions 211 can be evenly distributed along the circumferential direction of the second punching piece 21, the number of the protrusions 211 and the oil grooves 112 is not specifically limited.

[0057] In some modified embodiments of the present application, a plurality of oil grooves 112 are evenly distributed along the circumferential direction of the first punching piece 11, and the protrusions 211 are arranged between the positions corresponding to the plurality of oil grooves 112 on the second punching piece 21, and the plurality of oil grooves 112 are evenly arranged between two adjacent first welding grooves 111. By arranging the protrusions 211 between the positions corresponding to the oil grooves 112 on the second punching piece 21, it is avoided that the protrusions 211 block the positions of the oil grooves 112 and affect the entry of the cooling oil into the oil grooves 112, thereby improving the cooling effect. Specifically, 5 oil grooves 112 can be provided at the positions corresponding to the intermediate flow passages between every two protrusions.

[0058] In some modified embodiments of the present application, the thickness of the intermediate laminate 2 accounts for 4%-5% of the total thickness of the stack of the first punching piece 11 and the second punching piece 21. Reducing the thickness of the intermediate laminate 2 ensures the oil pressure of the oil in the stator core cooling system, and at the same time increases the pressure of the oil in the intermediate oil passage and the flow rate of each core oil passage, and reduces the influence on the electromagnetic performance due to the over-large intermediate slotting.

[0059] Embodiment 2

[0060] As Figure 8 and Figure 9 shown, a motor stator includes the above-mentioned motor stator core and a housing 3, and the housing 3 is installed on the outside of the motor stator core. Specifically, an interference fit can be provided between the motor stator core and the housing 3.

[0061] The motor stator core provided by the present application has a plurality of protrusions 211 arranged circumferentially on the outer periphery of the second punching sheet 21, and a second welding groove 22 is arranged on the side of the protrusion 211 away from the second punching sheet 21; thereby enabling the corresponding first welding groove 111 and the second welding groove 22 to jointly form a straight welding bead, so that the first punching sheet 11 and the second punching sheet 21 can be integrally welded, thereby avoiding the influence of the middle lamination 2 on the electromagnetic performance and NVH performance of the motor during segmented welding, and also avoiding oil leakage. In addition, a plurality of protrusions 211 arranged circumferentially on the outer periphery of the second punching sheet 21 also divide the continuous annular through oil passage at its corresponding position into multiple intermediate flow channels 4. By setting the maximum distance between the protrusion 211 and the center of the second punching sheet 21 to be less than half of the outer diameter of the first punching sheet 11, there is a gap between the protrusion 211 and the housing 3, so that when injecting oil, the housing 3 will enter the next intermediate flow channel 4 from the gap under the action of oil pressure only after filling one intermediate flow channel 4, thereby ensuring that a certain amount of oil flows out of the oil groove 112, further ensuring the cooling effect.

[0062] In some modified embodiments of the present application, such as Figure 8 and Figure 9 shown, an annular groove 31 is provided on the inner wall of the housing 3 at a position corresponding to the middle lamination 2. As Figure 8 shown, by providing an annular groove 31 on the inner wall of the housing 3 at a position corresponding to the middle lamination 2, a flow area for the oil can be provided, which is more convenient for the fluid to pass through the protrusion 211, reduces the flow resistance, and avoids blockage of the cooling oil.

[0063] In some modified embodiments of the present application, an oil inlet 32 and an oil outlet 33 are provided on the annular groove 31. The oil inlet 32 is directly opposite to the protrusion 211, and the oil inlet 32 and the oil outlet 33 are arranged at opposite positions on the annular groove 31. On the one hand, by setting the oil inlet 32 to be directly opposite to the protrusion 211, the oil can be quickly split after entering, thereby reducing the time for the cooling oil to flow into the oil outlet 33, reducing the flow resistance, reducing the pressure required to pump the cooling oil, and thus reducing the cost. On the other hand, by arranging the oil inlet 32 and the oil outlet 33 on opposite sides of the housing 3, the time for the cooling oil to flow into the oil outlet 33 on both sides is the same, thereby further reducing the time for the cooling oil to flow through all the intermediate flow channels 4 and enter the oil outlet 33, improving the cooling effect while also improving the cooling efficiency.

[0064] Specifically, an oil inlet passage 34 can also be provided on the housing 3. The oil inlet passage 34 is arranged along the axial direction of the stator and is communicated with the oil inlet 32, so as to facilitate oil inlet when the extending direction of the oil inlet 32 is blocked.

[0065] Embodiment 3

[0066] The third aspect of the present application provides a motor, including the above-mentioned motor stator.

[0067] For the motor stator core provided by the present application, a plurality of protrusions 211 are circumferentially arranged along the outer periphery of the second punching sheet 21, and a second welding groove 22 is arranged on the side of the protrusion 211 away from the second punching sheet 21; thus, the corresponding first welding groove 111 and the second welding groove 22 can jointly form a straight welding bead, so that the first punching sheet 11 and the second punching sheet 21 can be integrally welded, thereby avoiding the influence of the intermediate lamination 2 on the electromagnetic performance and NVH performance of the motor during segmented welding, and can also avoid oil leakage. In addition, a plurality of protrusions 211 are circumferentially arranged along the outer periphery of the second punching sheet 21, which also divides the continuous annular through oil passage at its corresponding position into multiple intermediate flow channels 4. By setting the maximum distance between the protrusion 211 and the center of the second punching sheet 21 to be less than half of the outer diameter of the first punching sheet 11, there is a gap between the protrusion 211 and the housing 3, so that when injecting oil, the housing 3 will enter the next intermediate flow channel 4 from the gap under the action of oil pressure only after one intermediate flow channel 4 is filled, thereby ensuring that a certain amount of oil fluid flows out of the oil groove 112, and further ensuring the cooling effect.

[0068] Embodiment 4

[0069] The fourth aspect of the present application provides a vehicle, including the above-mentioned motor.

[0070] For the motor stator core provided by the present application, a plurality of protrusions 211 are circumferentially arranged along the outer periphery of the second punching sheet 21, and a second welding groove 22 is arranged on the side of the protrusion 211 away from the second punching sheet 21; thus, the corresponding first welding groove 111 and the second welding groove 22 can jointly form a straight welding bead, so that the first punching sheet 11 and the second punching sheet 21 can be integrally welded, thereby avoiding the influence of the intermediate lamination 2 on the electromagnetic performance and NVH performance of the motor during segmented welding, and can also avoid oil leakage. In addition, a plurality of protrusions 211 are circumferentially arranged along the outer periphery of the second punching sheet 21, which also divides the continuous annular through oil passage at its corresponding position into multiple intermediate flow channels 4. By setting the maximum distance between the protrusion 211 and the center of the second punching sheet 21 to be less than half of the outer diameter of the first punching sheet 11, there is a gap between the protrusion 211 and the housing 3, so that when injecting oil, the housing 3 will enter the next intermediate flow channel 4 from the gap under the action of oil pressure only after one intermediate flow channel 4 is filled, thereby ensuring that a certain amount of oil fluid flows out of the oil groove 112, and further ensuring the cooling effect.

[0071] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A motor stator core, characterized in that, Comprising: A first punching sheet (11), a plurality of oil grooves (112) are circumferentially arranged on the first punching sheet (11), and a plurality of first welding grooves (111) are evenly spaced along the circumferential edge of the first punching sheet (11); and A second punching sheet (21), a plurality of protrusions (211) are formed by evenly protruding outward along the circumferential edge of the second punching sheet (21), and second welding grooves (212) are arranged at the ends of the protrusions (211); Wherein, a plurality of the first punching sheets (11) are coaxially stacked together in the thickness direction to form a first stack (1), a plurality of the second punching sheets (21) are coaxially stacked together in the thickness direction to form an intermediate stack (2), the protrusions (211) of the plurality of the second punching sheets are arranged corresponding to each other up and down, the intermediate stack (2) is coaxially stacked in the middle of the plurality of the first stacks (1) in the thickness direction, the edge of the intermediate stack (2) does not exceed the position of the oil grooves (112), the positions of the first welding grooves (111) and the second welding grooves (212) correspond to each other, and the corresponding first welding grooves (111) and second welding grooves (212) together form a straight welding bead, and the distance from the end of the protrusion (211) to the center of the second punching sheet (21) is less than the distance from the edge of the first punching sheet (11) to the center of the first punching sheet (11).

2. The motor stator core according to claim 1, wherein The cross-section of the protrusion (211) parallel to the second punching sheet (21) is trapezoid-like, and the trapezoid-like shape gradually narrows from the side close to the second punching sheet (21) to the side away from the second punching sheet (21), and the side edge of the trapezoid-like shape away from the second punching sheet (21) is arc-shaped.

3. The motor stator core according to claim 1, wherein A plurality of the oil grooves (112) are evenly arranged between two adjacent first welding grooves (111).

4. The motor stator core according to claim 1, wherein The thickness of the intermediate stack (2) accounts for 4%-5% of the total thickness of the stacking of the first punching sheet (11) and the second punching sheet (21).

5. A motor stator, characterized in that, Comprising the motor stator core according to any one of claims 1-4 and a housing (3), and the housing (3) is installed outside the motor stator core.

6. The motor stator according to claim 5, wherein An annular groove (31) is arranged on the inner wall of the housing (3) corresponding to the position of the intermediate stack (2).

7. The motor stator according to claim 6, wherein An oil inlet (32) and an oil outlet (33) are arranged on the annular groove (31), and the oil inlet (32) and the oil outlet (33) are arranged at opposite positions on the annular groove (31).

8. The motor stator according to claim 7, wherein The oil inlet (32) is directly opposite to any one of the protrusions (211).

9. A motor, characterized in that, Comprising the motor stator according to any one of claims 5-8.

10. A vehicle, characterized in that, Comprising the motor according to claim 9.

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