Stator core and electric machine

Abstract

The application relates to the field of motor cooling systems, in particular to a stator core and a motor. The stator core provided by the application can realize cooling of the stator core and the stator winding through the structure of the stator core, without the need of setting parts such as oil injection rings, sealing rings or oil injection pipes, so that the assembly operation of the motor is simplified, and the manufacturing cost of the motor is reduced; and the structure of the stator core enables the multiple silicon steel sheets to be connected through a conventional welding mode, without the need of using adhesive, so that the cost of the motor is further reduced.

Description

Technical Field

[0001] This application relates to the field of motor cooling systems, and in particular to a stator core and a motor. Background Technology

[0002] Currently, in new energy vehicles, the cooling system of the drive motor mostly uses oil injection rings or pipes to provide directional forced cooling to the motor stator. Some manufacturers have eliminated the oil injection ring or pipe structure, achieving oil cooling of the core and winding ends through the stator core's own structure. While this solution eliminates the oil-injection components, the core requires self-adhesive sheets for bonding, further increasing costs. Summary of the Invention

[0003] The purpose of this application is to provide a stator core and motor that can achieve oil cooling of the core and winding ends through the structure of the stator core itself, and the silicon steel sheets do not need to be connected by adhesive, which can reduce costs.

[0004] This application provides a stator core, including a main body and a draining part. The main body includes a plurality of stacked main silicon steel sheets, and the draining part is provided at the end of the main body. The draining part includes a plurality of stacked draining silicon steel sheets. The outer periphery of the main silicon steel sheet is uniformly provided with a plurality of oil guide grooves, and the oil guide grooves of the plurality of main silicon steel sheets are connected to each other to form an oil guide channel, wherein at least one of the oil guide channels is used for welding the plurality of main silicon steel sheets; the outer periphery of the main silicon steel sheet is provided with at least one first welding groove, and the first welding groove is located at the groove edge of the oil guide groove. Multiple main silicon steel sheets are stacked to form at least three core segments, each core segment including multiple main silicon steel sheets; the first welding grooves of multiple main silicon steel sheets located in the same core segment are connected to form a welding channel; the welding channel of the core segment located at the end is staggered with the welding channel of the core segment adjacent to the inner side; The drainage section is provided with a drainage channel that passes through multiple drainage silicon steel sheets. The drainage channel is connected to the oil guiding channel and has a drainage path extending towards the inner circle of the drainage section. Multiple second welding grooves are opened on the outer periphery of the drainage silicon steel sheets. The second welding grooves of the multiple drainage silicon steel sheets are opposite to each other and are connected to the welding channel of the iron core section at the end.

[0005] In the above technical solution, further, the inner ring of the main silicon steel sheet is uniformly provided with a plurality of first mounting grooves; the welding channels of any two adjacent core segments are rotated and offset by a preset angle around the central axis of the stator core; and the first mounting grooves of the plurality of main silicon steel sheets of the main body are correspondingly connected. The inner ring of the drainage silicon steel sheet is provided with a plurality of second mounting slots, which correspond one-to-one with the first mounting slots; and the second mounting slots of the plurality of drainage silicon steel sheets are connected to each other.

[0006] In the above technical solution, further, along the axial direction of the stator core, the welding channels of multiple core segments are rotated sequentially by a preset angle in the same rotation direction.

[0007] In the above technical solution, further, a plurality of the first welding grooves are uniformly formed on the outer periphery of the main silicon steel sheet.

[0008] In the above technical solution, the included angle between adjacent first mounting grooves is Z; the included angle between adjacent oil guide grooves is X; the included angle between adjacent first welding grooves is Y; the preset angle is a common multiple of Z and X, and the preset angle is not equal to a multiple of Y.

[0009] In the above technical solution, further, the plurality of diverting silicon steel sheets are respectively a first silicon steel sheet, a second silicon steel sheet, and a third silicon steel sheet; Along a direction away from the main body, the first silicon steel sheet, the second silicon steel sheet, and the third silicon steel sheet are arranged sequentially, and the first silicon steel sheet, the second silicon steel sheet, and the third silicon steel sheet are respectively provided with the second welding groove; The first silicon steel sheet has multiple drainage grooves on its outer periphery, the second silicon steel sheet has multiple drainage holes, and the third silicon steel sheet has multiple oil injection holes. The drainage grooves, drainage holes, and oil injection holes are connected to each other to form the drainage channel.

[0010] In the above technical solution, further, the circumference of the groove edge of the drainage groove is smaller than the outer circumference of the main silicon steel sheet; The outer circumference of the second silicon steel sheet is equal to the outer circumference of the main silicon steel sheet.

[0011] In the above technical solution, further, on the first silicon steel sheet, a raised support is provided at the groove edge of the second welding groove, and the circumference of the raised support is equal to the outer circumference of the main silicon steel sheet; When the first welding groove and the second welding groove are configured in multiple ways, between two adjacent second welding grooves of the first silicon steel sheet, the multiple diversion grooves are connected to each other through a confluence section to form an oil channel group.

[0012] In the above technical solution, further, in any of the oil passage groups, at least one of the oil injection holes is provided to communicate with the drainage channel through the drainage hole, and the number of the oil injection holes is less than or equal to the number of the drainage channels.

[0013] In the above technical solution, a first positioning groove is further provided on the outer periphery of the main silicon steel sheet, and the first positioning groove is located at the edge of the oil guide groove; the first positioning grooves of multiple main silicon steel sheets located in the same iron core segment are connected to form a positioning channel; the positioning channel of the iron core segment located at the end is staggered with the positioning channel of the inner adjacent iron core segment. The outer periphery of the diversion silicon steel sheet is provided with a second positioning groove, and the second positioning grooves of the plurality of diversion silicon steel sheets are opposite to each other and are connected to the positioning channel of the iron core section at the end.

[0014] This application also provides an electric motor, including the stator core described in the above-described scheme.

[0015] The above technical solution further includes a housing; The housing surrounds the stator core and closes the openings of the oil guide groove, the first welding groove, and the second welding groove. The housing is provided with an annular oil inlet channel, which surrounds the circumference of the stator core and is opposite to the core section located in the middle.

[0016] Compared with the prior art, the beneficial effects of this application are as follows: The stator core provided in this application can achieve cooling of the stator core and stator windings through its own structure, eliminating the need for components such as oil spray rings, sealing rings, or oil spray pipes, thus simplifying the motor assembly operation and reducing the motor manufacturing cost. Furthermore, the structure of the stator core allows multiple silicon steel sheets to be connected by conventional welding methods without the need for adhesives, further reducing the cost of the motor.

[0017] This application also provides an electric motor, including the stator core described in the above scheme. Based on the above analysis, it is clear that the electric motor also possesses the aforementioned beneficial effects, which will not be elaborated upon further here. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 A schematic diagram of the first structure of the stator core provided in this application; Figure 2 A schematic diagram of the disassembled structure of the stator core provided in this application; Figure 3 A structural schematic diagram of the main body provided for this application; Figure 4 This is a structural schematic diagram of the main silicon steel sheet provided in this application; Figure 5 A schematic diagram of the structure of the first silicon steel sheet provided in this application; Figure 6 This is a schematic diagram of the structure of the second silicon steel sheet provided in this application; Figure 7 This is a structural schematic diagram of the third silicon steel sheet provided in this application; Figure 8 A partial structural diagram of the stator core provided in this application, cut along the axial direction; Figure 9 This is a structural schematic diagram of the oil passage assembly provided in this application; Figure 10 This is a schematic diagram of the oil circuit structure of the motor provided in this application.

[0020] In the diagram: 101-Main body; 102-Drainage section; 103-Main silicon steel sheet; 104-Oil guide groove; 105-Oil guide channel; 106-Oil inlet channel; 107-Drainage channel; 108-First welding groove; 109-Core section; 110-Welding channel; 111-Second welding groove; 112-First mounting groove; 113-Second mounting groove; 114-First positioning groove; 115-Positioning channel; 116-Second positioning groove; 117-First silicon steel sheet; 118-Second silicon steel sheet; 119-Third silicon steel sheet; 120-Drainage groove; 121-Drainage hole; 122-Injection hole; 123-Combining oil passage; 124-Heightened support lug; 125-Combining section; 126-Oil passage assembly. Detailed Implementation

[0021] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0024] Example 1 The stator core provided in this application is used in a motor. The stator core is cylindrical, with a housing mounted on the outer ring and stator windings mounted on the inner ring. Oil enters from the middle of the housing. Through the oil guiding structure provided on the stator core, the cooling oil entering the housing can flow along the surface of the stator core to cool itself, and the cooling oil can flow towards the ends of the stator core, thereby forming a direct-injection oil column to cool the root of the stator windings.

[0025] See Figures 1 to 10 As shown, the stator core includes a main body 101 and a flow-guiding part 102. Along the axial direction of the stator core, the main body 101 is located in the middle of the stator core. The main body 101 includes multiple stacked main silicon steel sheets 103 to reduce eddy current losses and hysteresis losses. Multiple oil guide grooves 104 are uniformly formed on the outer periphery of the main silicon steel sheets 103. The oil guide grooves 104 of the multiple main silicon steel sheets 103 are correspondingly connected to form an oil guide channel 105. The length direction of the oil guide channel 105 is the axial direction of the stator core. The inner wall of the housing can close the openings of the multiple oil guide grooves 104. An oil inlet channel 106 surrounding the stator core is provided in the middle of the housing. Cooling oil entering the housing from the oil inlet channel 106 can only flow to both ends of the stator core through the multiple oil guide channels 105.

[0026] Both ends of the main body 101 are provided with a flow-guiding section 102. The flow-guiding section 102 includes multiple stacked flow-guiding silicon steel sheets to reduce eddy current losses and hysteresis losses. The flow-guiding section 102 is provided with a flow-guiding channel 107 that passes through the multiple flow-guiding silicon steel sheets. The flow-guiding channel 107 is correspondingly connected to the oil guiding channel 105, and the flow-guiding channel 107 has a flow-guiding path extending towards the inner ring of the flow-guiding section 102, so that the cooling oil can be guided to the stator winding installed in the inner ring of the stator core for oil spray cooling of the stator winding.

[0027] Furthermore, this application employs welding to connect the plurality of main silicon steel sheets 103 forming the main body 101, the plurality of drainage silicon steel sheets forming the drainage section 102, and the main body 101 and the drainage section 102. For the plurality of main silicon steel sheets 103 forming the main body 101, welding can be performed using the oil guide channel 105 connecting the plurality of main silicon steel sheets 103, so that the plurality of main silicon steel sheets 103 are connected as a single unit. However, the drainage channel 107 provided in the drainage section 102 extends inward to change the flow direction of the cooling oil. Since the outer periphery of the drainage section 102 cannot have a structure similar to an oil guide groove 104 opposite to the oil guide channel 105, the drainage section 102 needs to have a separate groove structure to achieve the connection of the plurality of drainage silicon steel sheets and the connection between the drainage section 102 and the main body 101.

[0028] Specifically, at least one first welding groove 108 is formed on the outer periphery of the main silicon steel sheet 103, and the first welding groove 108 is located at the edge of the oil guide groove 104. Multiple main silicon steel sheets 103 are stacked to form at least three iron core segments 109, and any iron core segment 109 includes multiple main silicon steel sheets 103; the first welding grooves 108 of multiple main silicon steel sheets 103 located in the same iron core segment 109 are correspondingly connected to form a welding channel 110; the welding channel 110 of the iron core segment 109 located at the end is staggered with the welding channel 110 of the inner adjacent iron core segment 109; multiple second welding grooves 111 are formed on the outer periphery of the drainage silicon steel sheet, and the second welding grooves 111 of the multiple drainage silicon steel sheets are opposite to and correspondingly connected to the welding channel 110 of the iron core segment 109 at the end.

[0029] Specifically, on the outer periphery of the main body 101, the cooling oil can only flow along a predetermined path. That is, the cooling oil first flows from the middle of the main body 101 along the oil guide channel 105 to both ends, and then the cooling oil can be guided from the oil guide channel 105 to the flow channel 107 to achieve the cooling effect on the root of the stator winding. However, the setting of the first welding groove 108 allows the cooling oil to also enter the welding channel 110, causing pressure relief at the welding channel 110, thereby reducing the cooling capacity of the stator winding.

[0030] Therefore, the main body 101 of this application includes multiple core segments 109. Even though the welding channel 110 in the middle is connected to the oil inlet channel 106, the welding channels 110 of the end core segments 109 are misaligned with the welding channel 110 in the middle, thus blocking the end of the welding channel 110 in the middle and preventing the flow of cooling oil. The second welding grooves 111 of the multiple drainage silicon steel sheets in the drainage section 102 are correspondingly connected, and the multiple drainage silicon steel sheets can be welded to each other through the multiple second welding grooves 111. Moreover, the multiple second welding grooves 111 are connected to the welding channels 110 of the end core segments 109. During welding, the end core segments 109 and the drainage section 102 can be welded together through the welding channels 110 and the second welding grooves 111 to form a complete core structure.

[0031] The stator core provided in this application can achieve cooling of the stator core and stator windings through its own structure, eliminating the need for components such as oil spray rings, sealing rings, or oil spray pipes, thus simplifying the motor assembly operation and reducing the motor manufacturing cost. Furthermore, the structure of the stator core allows multiple silicon steel sheets to be connected by conventional welding methods without the need for adhesives, further reducing the cost of the motor.

[0032] In this optional embodiment, the inner ring of the main silicon steel sheet 103 is uniformly provided with a plurality of first mounting grooves 112; the welding channels 110 of any two adjacent core segments 109 are rotated and offset by a preset angle around the central axis of the stator core; and the first mounting grooves 112 of the plurality of main silicon steel sheets 103 of the main body 101 are correspondingly connected; the inner ring of the drainage silicon steel sheet is provided with a plurality of second mounting grooves 113, and the second mounting grooves 113 correspond one-to-one with the first mounting grooves 112; and the second mounting grooves 113 of the plurality of drainage silicon steel sheets are correspondingly connected.

[0033] In this embodiment, the main body 101 is composed of multiple main silicon steel sheets 103 of the same specification. The welding channel 110 can be misaligned simply by rotating the angles of the multiple core segments 109, thus reducing design and assembly difficulty. Multiple first mounting grooves 112 are uniformly formed on the inner ring of the main silicon steel sheets 103, and these first mounting grooves 112 are correspondingly connected. Multiple second mounting grooves 113 are uniformly formed on the inner ring of the guiding silicon steel sheets, and these second mounting grooves 113 are correspondingly connected to the first mounting grooves 112, thereby allowing the stator winding to be fixed within the first and second mounting grooves 112. When misaligning the welding channel 110 formed by the multiple core segments 109, different core segments 109 are rotated around the central axis of the stator core. The rotated core segments 109 not only misalign the welding channel 110 but also ensure that the first mounting grooves 112 are interconnected, thus not affecting the function of fixing the stator winding.

[0034] Furthermore, rotating the core segments 109 together not only misaligns the welding channels 110 to block the oil flow path, but also solves the problem of unevenness on the end faces of the stacked stator core. Specifically, for the multiple main silicon steel sheets 103 of the main body 101, the main silicon steel sheets 103 have the same specifications. Due to processing and assembly errors, uneven thickness may occur in some areas of the main silicon steel sheets 103. If multiple main silicon steel sheets 103 are stacked in the same direction, the thick areas will be higher and the thin areas will be lower. Rotating the multiple core segments 109 allows the thin and thick areas of the main silicon steel sheets 103 to offset each other, thereby ensuring a higher flatness of the entire stator core.

[0035] In an optional embodiment, specifically, when adjusting the orientation of multiple core segments 109, the multiple core segments 109 can be rotated sequentially in the same direction from one end of the stator core to the other along the axial direction of the stator core, so that their corresponding welding channels 110 are misaligned with each other, and the preset angle of misalignment is the same each time, thereby simplifying the assembly difficulty. See Figure 3 As shown, for the structure shown, the multiple iron core segments 109 of the main body 101 can be rotated clockwise or counterclockwise in sequence from bottom to top.

[0036] In this embodiment, in an optional configuration, the outer periphery of the main silicon steel sheet 103 is provided with a plurality of first welding grooves 108, and the outer periphery of the drain silicon steel sheet is provided with a plurality of corresponding second welding grooves 111, which can enable the main body 101 and the drain part 102 to be connected by evenly distributed welding lines, thus ensuring the stability of the connection between the main body 101 and the drain part 102.

[0037] In this embodiment, the included angle between adjacent first mounting grooves 112 is Z; the included angle between adjacent oil guide grooves 104 is X; the included angle between adjacent first welding grooves 108 is Y; the preset angle is a common multiple of Z and X, and the preset angle is not equal to a multiple of Y.

[0038] In this embodiment, when rotating the multiple core segments 109 of the main body 101, the preset angle needs to be set to ensure that the first mounting grooves 112 of the different core segments 109 after rotation are correspondingly connected to each other, and the oil guide grooves 104 are correspondingly connected to each other. That is, the preset angle is a multiple of the included angle Z of adjacent first mounting grooves 112, and also a multiple of the included angle X of adjacent oil guide grooves 104. Therefore, the preset angle is a common multiple of Z and X. However, the first welding grooves 108 of the different core segments 109 after rotation need to be staggered from each other, and the preset angle is not equal to a multiple of Y, so that the first welding grooves 108 after rotation can also be staggered from each other with the other first welding grooves 108 of the adjacent core segments 109.

[0039] In an optional embodiment, a first positioning groove 114 is provided on the outer periphery of the main silicon steel sheet 103, and the first positioning groove 114 is located at the edge of the oil guide groove 104; the first positioning grooves 114 of multiple main silicon steel sheets 103 located in the same iron core section 109 are connected to form a positioning channel 115; the positioning channel 115 of the iron core section 109 at the end is staggered with the positioning channel 115 of the inner adjacent iron core section 109; a second positioning groove 116 is provided on the outer periphery of the drainage silicon steel sheet, and the second positioning grooves 116 of multiple drainage silicon steel sheets are opposite to each other and are connected to the positioning channel 115 of the iron core section 109 at the end.

[0040] In this embodiment, since the contact surfaces of the stator core and the housing are both cylindrical, a positioning structure needs to be provided between the stator core and the housing to prevent relative movement between them. Specifically, a positioning channel 115 is provided in the axial direction of the stator core to form a keyway, which allows the stator core and the housing to be connected by a key, thereby achieving the positioning function of the stator core.

[0041] The positioning channel 115 should not be axially continuous to avoid oil pressure loss at the positioning channel 115. The positioning channels 115 of different core sections 109 also need to be staggered to block the oil flow in the positioning channel 115 of the middle core section 109. The structure of the positioning channel 115 is similar to that of the drainage channel 107, and the structure of the second positioning groove 116 is similar to that of the second welding groove 111, which will not be described in detail here. When positioning the stator core, keys are installed in the positioning channels 115 and the second positioning groove 116 of the two end core sections 109 to connect and fix them to the housing, while the middle core section 109 is pressed and fixed between the end core sections 109, thereby achieving the positioning of the entire stator core.

[0042] Example 2 The stator core in this second embodiment is an improvement on the above embodiments. The technical content disclosed in the above embodiments will not be described again, and the content disclosed in the above embodiments also belongs to the content disclosed in this second embodiment.

[0043] In this embodiment, the multiple drainage silicon steel sheets are a first silicon steel sheet 117, a second silicon steel sheet 118, and a third silicon steel sheet 119. The first silicon steel sheet 117, the second silicon steel sheet 118, and the third silicon steel sheet 119 are arranged sequentially in the direction away from the main body 101, and the first silicon steel sheet 117, the second silicon steel sheet 118, and the third silicon steel sheet 119 are respectively provided with a second welding groove 111. The outer periphery of the first silicon steel sheet 117 is provided with a plurality of drainage grooves 120, the second silicon steel sheet 118 is provided with a plurality of drainage holes 121, and the third silicon steel sheet 119 is provided with a plurality of oil spray holes 122. The drainage grooves 120, the drainage holes 121, and the oil spray holes 122 are respectively connected to form a drainage channel 107.

[0044] In this embodiment, see Figure 5 and Figure 8 As shown, the drainage groove 120 opened on the first silicon steel sheet 117 is connected to the oil guiding channel 105 of the iron core section 109 at the end in a one-to-one correspondence. The drainage groove 120 is a V-shaped groove. The larger opening of the drainage groove 120 is connected to the oil guiding channel 105 so that the cooling oil in the oil guiding channel 105 enters the drainage groove 120 from the opening of the drainage groove 120. The bottom of the drainage groove 120 extends towards the center of the first silicon steel sheet 117 so that the drainage groove 120 forms a first drainage path in the radial direction, and the gradually shrinking size of the V-shaped groove can increase the oil pressure.

[0045] See Figure 6 and Figure 8 As shown, the second silicon steel sheet 118 is located on the side of the first silicon steel sheet 117 away from the main body 101. The second silicon steel sheet 118 has a drainage hole 121, the length direction of which is radial to form a second drainage path in the radial direction. The end of the drainage hole 121 away from the center of the second silicon steel sheet 118 matches and is connected to the bottom of the drainage groove 120. Cooling oil can flow from the bottom of the drainage groove 120 into the drainage hole 121 and further flow towards the center of the second silicon steel sheet 118. The second drainage path and the first drainage path form a stepped drainage channel 107.

[0046] See Figure 7 and Figure 8 As shown, the third silicon steel sheet 119 is located on the side of the second silicon steel sheet 118 away from the first silicon steel sheet 117, that is, the third silicon steel sheet 119 is located at the end of the iron core body. The third silicon steel sheet 119 has an oil spray hole 122, which is connected to the end of the drain hole 121 near the center of the second silicon steel sheet 118, so that the oil spray hole 122 is close to the root of the stator winding, thereby realizing oil spray cooling of the root of the stator winding.

[0047] Optionally, the spray direction of the oil injection hole 122 can be changed by setting the axial direction of the oil injection hole 122. The oil injection hole 122 can be set in the thickness direction of the third silicon steel sheet 119 or at an angle to the thickness direction of the third silicon steel sheet 119. The oil injection hole 122 can be a circular hole, a rectangular hole, a triangular hole, a diamond-shaped hole, an elliptical hole, or a horseshoe-shaped hole, etc.

[0048] In this embodiment, in an optional configuration, the circumference of the groove edge of the drainage groove 120 is smaller than the outer circumference of the main silicon steel sheet 103; the outer circumference of the second silicon steel sheet 118 is equal to the outer circumference of the main silicon steel sheet 103.

[0049] In this embodiment, along the axial direction of the stator core, one side of the first silicon steel sheet 117 is the main silicon steel sheet 103, and the other side is the second silicon steel sheet 118, meaning the first silicon steel sheet 117 is sandwiched between the main silicon steel sheet 103 and the second silicon steel sheet 118. Compared to the main silicon steel sheet 103 and the second silicon steel sheet 118, the first silicon steel sheet 117 is smaller in size, so that its circumference is concave to form a confluence oil channel 123. Cooling oil flowing out from the oil guide channel 105 of the main silicon steel sheet 103 can enter the circumferential confluence oil channel 123 of the first silicon steel sheet 117, and then enter each guide channel 107. This avoids uneven oil volume and pressure at the subsequent oil spray holes 122 caused by uneven oil volume in each guide channel 105, thereby improving the uniformity of cooling.

[0050] In the optional schemes of this embodiment, see [link to relevant documentation]. Figure 5 and Figure 9 As shown, on the first silicon steel sheet 117, a raised support ear 124 is provided at the groove edge of the second welding groove 111, and the circumference of the raised support ear 124 is equal to the outer circumference of the main silicon steel sheet 103; when the first welding groove 108 and the second welding groove 111 are respectively set as multiple, between two adjacent second welding grooves 111 of the first silicon steel sheet 117, multiple diversion grooves 120 are connected to each other through the confluence section 125 to form an oil channel group 126.

[0051] In this embodiment, the heightened support lugs 124 ensure that the size of the second welding groove 111 on the first silicon steel sheet 117 is the same as the size of the second welding groove 111 on the other silicon steel sheets and the first welding groove 108 on the main silicon steel sheet 103, thus ensuring reliable welding between the silicon steel sheets. Furthermore, the multiple heightened support lugs 124 divide the oil conduit 123 into multiple conduit segments 125, each conduit segment 125 being connected to multiple oil guide channels 105 and multiple drainage channels 107, forming multiple oil channel groups 126. The interconnected structure formed in the oil channel groups 126 results in a more uniform oil pressure distribution and better cooling of the stator windings.

[0052] Optionally, on the first silicon steel sheet 117, the second positioning groove 116 and one of the second welding grooves 111 are respectively located on both sides of the groove edge of the same oil guide groove 104, and the groove edge of the second positioning groove 116 is also provided with a heightening support 124, so that the size of the second positioning groove 116 on the first silicon steel sheet 117 is the same as the size of the second positioning groove 116 on the other silicon steel sheets and the first positioning groove 114 on the main silicon steel sheet 103.

[0053] In an optional embodiment, in any oil passage group 126, at least one injection hole 122 is provided to communicate with the diversion groove 120 through the diversion hole 121, and the number of injection holes 122 is less than or equal to the number of diversion grooves 120.

[0054] In this embodiment, the number of oil nozzles 122 can be set according to requirements. For example, for the oil channel group 126 with low oil pressure at the top of the stator core, the number of oil nozzles 122 can be reduced to increase the oil pressure there. However, each oil channel group 126 shall be provided with at least one oil nozzle 122 for pressure relief. The number of oil nozzles 122 shall correspond one-to-one with the number of drainage grooves 120.

[0055] Example 3 Embodiment 3 of this application provides an electric motor, which includes the stator core of any of the above embodiments. Therefore, it has all the beneficial technical effects of the stator core of any of the above embodiments, which will not be repeated here.

[0056] In an optional embodiment, the motor further includes a housing that surrounds the stator core and is interference-fitted with it. The housing closes the openings of the oil guide groove 104, the first welding groove 108, and the second welding groove 111. The housing is provided with an annular oil inlet channel 106, which surrounds the circumference of the stator core and is opposite to the core section 109 located in the middle. The cooling oil entering the housing from the oil inlet channel 106 can only flow to both ends of the stator core through multiple oil guide channels 105.

[0057] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In addition, those skilled in the art can understand that although some embodiments herein include certain features included in other embodiments but not other features, combinations of features from different embodiments are meant to be within the scope of this application and form different embodiments.

Claims

1. A stator core, comprising a main body and a current-guiding part, the main body comprising a plurality of stacked main silicon steel sheets, the current-guiding part being disposed at an end of the main body, the current-guiding part comprising a plurality of stacked current-guiding silicon steel sheets, characterized in that: The outer periphery of the main silicon steel sheet is uniformly provided with a plurality of oil guide grooves, and the oil guide grooves of the plurality of main silicon steel sheets are connected to each other to form an oil guide channel, wherein at least one of the oil guide channels is used for welding the plurality of main silicon steel sheets; the outer periphery of the main silicon steel sheet is provided with at least one first welding groove, and the first welding groove is located at the groove edge of the oil guide groove. Multiple main silicon steel sheets are stacked to form at least three core segments, each core segment including multiple main silicon steel sheets; the first welding grooves of multiple main silicon steel sheets located in the same core segment are connected to form a welding channel; the welding channel of the core segment located at the end is staggered with the welding channel of the core segment adjacent to the inner side; The drainage section is provided with a drainage channel that passes through multiple drainage silicon steel sheets. The drainage channel is connected to the oil guiding channel and has a drainage path extending towards the inner circle of the drainage section. Multiple second welding grooves are opened on the outer periphery of the drainage silicon steel sheets. The second welding grooves of the multiple drainage silicon steel sheets are opposite to each other and are connected to the welding channel of the iron core section at the end.

2. The stator core according to claim 1, characterized in that, The inner ring of the main silicon steel sheet is uniformly provided with a plurality of first mounting slots; the welding channels of any two adjacent core segments are rotated and offset by a preset angle around the central axis of the stator core; and the first mounting slots of the plurality of main silicon steel sheets of the main body are correspondingly connected. The inner ring of the drainage silicon steel sheet is provided with a plurality of second mounting slots, which correspond one-to-one with the first mounting slots; and the second mounting slots of the plurality of drainage silicon steel sheets are connected to each other.

3. The stator core according to claim 2, characterized in that, Along the axial direction of the stator core, the welding channels of multiple core segments rotate sequentially and are offset by a preset angle in the same rotation direction.

4. The stator core according to claim 2, characterized in that, The outer periphery of the main silicon steel sheet is uniformly provided with multiple first welding grooves.

5. The stator core according to claim 4, characterized in that, The included angle between adjacent first mounting grooves is Z; the included angle between adjacent oil guide grooves is X; the included angle between adjacent first welding grooves is Y; the preset angle is a common multiple of Z and X, and the preset angle is not equal to a multiple of Y.

6. The stator core according to claim 1, characterized in that, The plurality of the drainage silicon steel sheets are respectively a first silicon steel sheet, a second silicon steel sheet, and a third silicon steel sheet; Along a direction away from the main body, the first silicon steel sheet, the second silicon steel sheet, and the third silicon steel sheet are arranged sequentially, and the first silicon steel sheet, the second silicon steel sheet, and the third silicon steel sheet are respectively provided with the second welding groove; The first silicon steel sheet has multiple drainage grooves on its outer periphery, the second silicon steel sheet has multiple drainage holes, and the third silicon steel sheet has multiple oil injection holes. The drainage grooves, drainage holes, and oil injection holes are connected to each other to form the drainage channel.

7. The stator core according to claim 6, characterized in that, The circumference of the groove edge of the drainage channel is smaller than the outer circumference of the main silicon steel sheet. The outer circumference of the second silicon steel sheet is equal to the outer circumference of the main silicon steel sheet.

8. The stator core according to claim 7, characterized in that, On the first silicon steel sheet, a raised support is provided at the edge of the second welding groove, and the circumference of the raised support is equal to the outer circumference of the main silicon steel sheet; When the first welding groove and the second welding groove are configured in multiple ways, between two adjacent second welding grooves of the first silicon steel sheet, the multiple diversion grooves are connected to each other through a confluence section to form an oil channel group.

9. The stator core according to claim 8, characterized in that, In any of the oil passage groups, at least one of the oil injection holes is provided to communicate with the drainage channel through the drainage hole, and the number of the oil injection holes is less than or equal to the number of the drainage channels.

10. The stator core according to claim 1, characterized in that, The outer periphery of the main silicon steel sheet is provided with a first positioning groove, and the first positioning groove is located at the edge of the oil guide groove; the first positioning grooves of multiple main silicon steel sheets located in the same iron core segment are connected to form a positioning channel; the positioning channel of the iron core segment located at the end is staggered with the positioning channel of the inner adjacent iron core segment. The outer periphery of the diversion silicon steel sheet is provided with a second positioning groove, and the second positioning grooves of the plurality of diversion silicon steel sheets are opposite to each other and are connected to the positioning channel of the iron core section at the end.

11. An electric motor, characterized in that, Includes the stator core as described in any one of claims 1 to 10.

12. The motor according to claim 11, characterized in that, It also includes the casing; The housing surrounds the stator core and closes the openings of the oil guide groove, the first welding groove, and the second welding groove. The housing is provided with an annular oil inlet channel, which surrounds the circumference of the stator core and is opposite to the core section located in the middle.

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