An electric motor stator, an oil-cooled electric motor, and a vehicle

Abstract

This utility model relates to the field of vehicle technology, specifically disclosing a motor stator, an oil-cooled motor, and a vehicle. The stator core of the motor stator includes a first segment, which includes multiple laminations stacked sequentially and multiple cooling oil channels arranged circumferentially. Each lamination includes multiple lamination units stacked sequentially. The cooling oil channels are formed by sequentially connecting circulating oil channels in each lamination group. Each circulating oil channel in the lamination group is formed by sequentially connecting oil passages in each lamination unit. The flow areas of any two adjacent oil passages are different, causing the passing cooling oil to form turbulence and increase the heat exchange area, thus ensuring the cooling effect on the stator core. The oil passage with the largest flow area is the primary oil passage, and the remaining oil passages are secondary oil passages. Along the axial direction of the stator core, the center lines of each primary oil passage coincide, and the projections of each secondary oil passage are all within the coverage area of ​​the projection of the primary oil passage, making the cooling oil channels straight-through for easy assembly.

Description

Technical Field

[0001] This utility model relates to the field of vehicle technology, and in particular to a motor stator, an oil-cooled motor, and a vehicle. Background Technology

[0002] The higher the speed, torque density, and power density of an electric motor, the more heat it generates. Therefore, a proper heat dissipation and cooling structure is essential for the reliable, stable, and efficient operation of the motor. Motor cooling can be categorized into air cooling, water cooling, and oil cooling. Oil cooling, with its inherent electrical insulation and high degree of structural design freedom, is becoming the preferred cooling solution for high-performance motors.

[0003] In the prior art, such as the earlier patent application number CN202210507529.7, a motor stator is provided. The motor stator includes a stator core, and the stator core is provided with a circulating oil channel. When the cooling oil flows through the circulating oil channel, it can dissipate heat from the stator core. The stator core includes multiple lamination groups stacked along the axial direction. Each lamination group is formed by stacking multiple laminations along the thickness direction. Each lamination group is provided with an axially penetrating oil passage. The oil passages of each lamination group have the same flow area, and the oil passages of adjacent lamination groups are staggered along the circumference of the stator core. This increases the contact area between the cooling oil and the downstream lamination group when the cooling oil passes through the connection between two lamination groups, thereby improving the cooling effect. However, in this stator core, the oil passages of adjacent laminations are misaligned along the circumference of the stator core. Therefore, during assembly, the two adjacent laminations need to be misaligned along the circumference of the stator core, which makes the assembly process complex and prone to errors, thus affecting the cooling effect on the stator core. Utility Model Content

[0004] The purpose of this utility model is to provide a motor stator, an oil-cooled motor, and a vehicle that, while ensuring the cooling effect on the stator core, reduces the assembly process and thus ensures the cooling effect on the stator core.

[0005] In a first aspect, this utility model provides a motor stator, which includes a stator core. The stator core includes a first segment, which includes a plurality of lamination groups stacked sequentially along the axial direction of the stator core. Each lamination group includes a plurality of lamination units stacked sequentially along the axial direction of the stator core. The first segment is provided with a plurality of cooling oil channels, which are evenly distributed along the circumferential direction of the first segment. Each cooling oil channel is formed by sequentially connecting circulating oil channels provided in each lamination group. Each circulating oil channel in the lamination group is formed by sequentially connecting oil passages provided in each lamination unit. The flow areas of any two adjacent oil passages are different.

[0006] Each of the circulating oil passages includes several primary oil passages and several secondary oil passages, and the flow area of ​​the primary oil passages is greater than the flow area of ​​any of the secondary oil passages; along the axial direction of the stator core, the center lines of each of the primary oil passages in the cooling oil passages coincide, and the projections of each of the secondary oil passages are all within the coverage area of ​​the projection of the primary oil passages.

[0007] As a preferred technical solution for the motor stator, the center lines of each of the oil passages in the circulating oil passage coincide.

[0008] As a preferred technical solution for the motor stator, the circulating oil passage includes a scaling reference line, which coincides with the wall of each oil passage hole in the circulating oil passage.

[0009] As a preferred technical solution for the motor stator, the scaling reference lines of each of the circulating oil passages coincide; or,

[0010] In any two adjacent circulating oil passages, the scaling reference lines of the two circulating oil passages are spaced apart, and in any three adjacent circulating oil passages, the scaling reference lines of the two circulating oil passages on both sides coincide.

[0011] As a preferred technical solution for the motor stator, the stator core includes two first segments, an intermediate segment, and two second segments. Along the axial direction of the stator core, one second segment, one first segment, the intermediate segment, another first segment, and another second segment are stacked sequentially. The first segment is provided with an oil collecting ring cavity, and the second segment is provided with multiple spray holes. The oil collecting ring cavity is connected to each cooling oil passage of each first segment. In any adjacent first and second segments, multiple cooling oil passages are connected to multiple spray holes in a one-to-one correspondence; and / or,

[0012] Each of the lamination units is provided with a positioning through hole, and the center lines of the positioning through holes on each of the lamination units coincide along the axial direction of the stator core.

[0013] As a preferred technical solution for the motor stator, each of the oil passage holes on each of the lamination units has the same shape and the same flow area.

[0014] As a preferred technical solution for the motor stator, each of the lamination units is provided with multiple winding slot units, and the multiple winding slot units are evenly distributed along the circumferential direction of the lamination unit, and the included angle between the center lines of any two adjacent winding slot units is α.

[0015] The stacked plate group includes N stacked plate units. The plurality of oil passage holes on each stacked plate unit are divided into M circumferential oil passage groups. The M circumferential oil passage groups are evenly distributed along the circumferential direction of the stacked plate unit. Each circumferential oil passage group includes a×N oil passage holes arranged sequentially along the circumferential direction of the stacked plate unit. a and N are both positive integers, N≥2, and N×M=360° / α.

[0016] Along the axial direction of the stator core, the plurality of oil passages in the circulating oil passage are sequentially: first oil passage, second oil passage... nth oil passage, where n is an integer greater than or equal to 2;

[0017] Along the circumferential direction of the stator core, the a×N oil passages in each circumferential oil hole group are sequentially: a first oil passage, a second oil passage, ... a nth oil passage;

[0018] The relative deflection angle between any two adjacent stacked units is α.

[0019] As a preferred technical solution for the motor stator, N=2 and n=2; along the axial direction of the stator core, the two oil passages in the circulating oil passage are, in sequence, a first oil passage and a second oil passage;

[0020] Along the circumferential direction of the stator core, the 2a oil passages in each circumferential oil hole group are, in sequence, a first oil passage and a second oil passage;

[0021] The lamination unit has a first axial end face and a second axial end face. Along the axial direction of the stator core, in any two adjacent lamination units in the first segment, the first axial end face of one lamination unit coincides with the second axial end face of the other lamination unit.

[0022] Secondly, this utility model provides an oil-cooled motor, including a motor housing, a rotor shaft, a rotor, and a motor stator as described in any of the above embodiments. The motor stator further includes a stator winding disposed on the stator core. The rotor shaft is rotatably disposed on the motor housing, the rotor is fixedly disposed on the rotor shaft, and the stator core is fixedly disposed inside the motor housing, with the stator core being gap-fitted onto the rotor.

[0023] The motor housing is provided with an oil inlet channel, which is used to supply cooling oil to each of the cooling oil passages.

[0024] Thirdly, this utility model provides a vehicle that includes the aforementioned oil-cooled motor and a gearbox, wherein the oil-cooled motor is connected to the input shaft of the gearbox.

[0025] The beneficial effects of this utility model are as follows:

[0026] This utility model provides a motor stator, an oil-cooled motor, and a vehicle. The motor stator includes a stator core, which includes a first segment. The first segment includes multiple lamination groups stacked sequentially along the axial direction of the stator core. Each lamination group includes multiple lamination units stacked sequentially along the axial direction of the stator core. The first segment has multiple cooling oil channels, which are evenly distributed along the circumference of the first segment. Each cooling oil channel is formed by sequentially connecting circulation oil channels provided in each lamination group. Each circulation oil channel in the lamination group is formed by sequentially connecting oil passages provided in each lamination unit. The flow areas of any two adjacent oil passages are different. Each circulation oil channel includes several primary oil passages and several secondary oil passages, and the flow area of ​​the primary oil passages is larger than the flow area of ​​any secondary oil passage. Along the axial direction of the stator core, the center lines of each primary oil passage in the cooling oil channel coincide, and the projections of each secondary oil passage are all within the coverage area of ​​the projection of the primary oil passage. With this design, when the cooling oil flows through each circulation channel, the different flow areas of any two adjacent oil passages create turbulence between them, reducing heat transfer resistance and improving the cooling effect on the stator core. Furthermore, a stepped surface is formed between adjacent oil passages with smaller and larger flow areas, increasing the heat transfer area and further enhancing the cooling effect on the stator core. Additionally, the centerlines of all primary oil passages in the cooling oil channel coincide, and the projection of each secondary oil passage falls within the coverage area of ​​the primary oil passage's projection, resulting in a straight-through cooling oil channel that facilitates assembly. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the stator core structure in an embodiment of this utility model;

[0028] Figure 2 This is a partial structural diagram of the first type of cooling oil passage in an embodiment of the present invention;

[0029] Figure 3 This is a partial structural diagram of the second type of cooling oil passage in an embodiment of this utility model;

[0030] Figure 4 This is a partial structural diagram of the third type of cooling oil passage in this embodiment of the present invention;

[0031] Figure 5 This is an exploded view of a stacked assembly according to an embodiment of the present invention;

[0032] Figure 6 This is a partial structural schematic diagram of one distribution pattern of the cooling oil channels in the first segment of this utility model embodiment;

[0033] Figure 7 This is a schematic diagram of the structure of a stacked unit in an embodiment of the present invention;

[0034] Figure 8 This is an exploded view of another stacked assembly in an embodiment of the present invention;

[0035] Figure 9 This is a partial structural diagram of another distribution mode of the cooling oil passages in the first segment of this utility model embodiment;

[0036] Figure 10 This is a schematic diagram of another stacked unit in an embodiment of the present invention;

[0037] Figure 11 This is an exploded view of another stacked assembly in an embodiment of the present invention;

[0038] Figure 12 This is a partial structural diagram of another distribution of the cooling oil channels in the first segment of this utility model embodiment.

[0039] In the picture:

[0040] 100. Stator core; 1001. First section; 1002. Intermediate section; 1003. Second section; 1004. Cooling oil passage;

[0041] 10. Stacked pieces;

[0042] 1. Laminated unit; 11. Stator yoke unit; 111. Primary oil passage hole; 112. Secondary oil passage hole; 113. Tertiary oil passage hole; 114. Positioning through hole; 12. Stator tooth unit; 13. Winding slot unit;

[0043] 2. Circulating oil passages;

[0044] 3. Circumferential oil hole group. Detailed Implementation

[0045] The technical solution of this utility model 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 utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0046] In the description of this utility model, 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 utility model and for 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Moreover, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0047] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0048] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0049] This embodiment provides a vehicle including an oil-cooled motor and a transmission, with the oil-cooled motor and transmission being drive-connected. This vehicle is a new energy vehicle. The oil-cooled motor is cooled by cooling oil to ensure stable cooling performance. The transmission is drive-connected to the drive axle. Driven by the oil-cooled motor, power is transmitted to the wheels through the transmission and drive axle to provide power for vehicle movement.

[0050] Among them, oil-cooled motors refer to motors that use cooling oil to directly contact the main heat-generating components for cooling, usually meaning that the cooling oil directly contacts the stator windings.

[0051] Specifically, in this embodiment, the oil-cooled motor includes a motor housing, a rotor shaft, a rotor, and a motor stator. The motor stator includes a stator core 100 and stator windings disposed on the stator core 100. The rotor shaft is rotatably disposed on the motor housing, and the rotor is fixedly disposed on the rotor shaft. The stator core 100 is fixedly disposed inside the motor housing. The motor housing is provided with an oil inlet channel. Cooling oil enters each cooling oil channel 1004 of the stator core through the oil inlet channel. The cooling oil flows through each cooling oil channel 1004 to cool the stator core 100, thereby cooling the motor stator to ensure stable motor operation performance.

[0052] The stator core 100 is composed of multiple silicon steel laminations stacked together. The stator core 100 is a key component of the motor stator and an important part of the motor's magnetic circuit, which can concentrate and guide the magnetic field.

[0053] The stator of an oil-cooled motor refers to the stationary part of the motor. For the commonly used permanent magnet synchronous motor, it is often a component consisting of the stator core 100 and the stator windings.

[0054] The existing motor stator includes a stator core with circulating oil channels. Cooling oil flowing through these channels dissipates heat from the stator core. The stator core comprises multiple laminations stacked axially. Each lamination group consists of multiple laminations stacked along its thickness. Each lamination group has an axially penetrating oil passage. These oil passages are sequentially connected to form the circulating oil channels. The flow area of ​​the oil passages in each lamination group is the same, and the oil passages of adjacent lamination groups are misaligned along the circumference of the stator core. This increases the contact area between the cooling oil and the downstream lamination group when the cooling oil passes through the connection between two lamination groups, thereby improving the cooling effect. However, in this stator core, the misalignment of the oil passages of adjacent lamination groups along the circumference of the stator core necessitates that adjacent lamination groups be misaligned circumferentially during assembly. This leads to a complex assembly process, is prone to errors, and consequently affects the cooling effect on the stator core.

[0055] For this, please refer to Figures 1 to 12In this embodiment, the stator core 100 includes a first segment 1001, which includes a plurality of lamination groups 10 stacked sequentially along the axial direction of the stator core 100. Each lamination group 10 includes a plurality of lamination units 1 stacked sequentially along the axial direction of the stator core 100. The first segment 1001 is provided with a plurality of cooling oil channels 1004, which are evenly distributed along the circumferential direction of the first segment 1001. Each cooling oil channel 1004 is formed by sequentially connecting circulating oil channels 2 disposed in each lamination group 10. Each circulating oil channel 2 in the stator core 100 is formed by sequentially connecting oil passages provided in each lamination unit 1, and the flow areas of any two adjacent oil passages are different; each circulating oil channel 2 includes several primary oil passages 111 and several secondary oil passages, and the flow area of ​​the primary oil passages 111 is greater than the flow area of ​​any secondary oil passage; along the axial direction of the stator core 100, the center lines of each primary oil passage 111 in the cooling oil channel 1004 coincide, and the projections of each secondary oil passage are all within the coverage area of ​​the projection of the primary oil passage 111. With this configuration, when the cooling oil flows through each circulating oil channel 2, the different flow areas of any two adjacent oil passages in the circulating oil channel 2 create turbulence between them, reducing heat transfer resistance and improving the cooling effect on the stator core 100. Furthermore, a stepped surface is formed between adjacent oil passages with different flow areas, increasing the heat transfer area and further enhancing the cooling effect on the stator core 100. Additionally, the centerlines of all primary oil passages 111 in the cooling oil channel 1004 coincide, and the projections of all secondary oil passages are within the coverage area of ​​the projections of the primary oil passages 111, making the cooling oil channel 1004 a straight-through design, facilitating assembly. In another embodiment, any two adjacent oil passages can also be partially connected and partially misaligned as needed.

[0056] It should be noted that in this embodiment, the flow area of ​​each primary oil passage 111 is the same, and the shape is the same.

[0057] In this embodiment, each stacking unit 1 can be composed of several first laminations stacked together. The specific number of first laminations can be set according to actual needs, and can be one, two or more.

[0058] In this embodiment, the shape of the oil passage can be selected according to actual needs, such as square, circular, or other shapes. For example, Figures 2 to 4 As shown in the figure, this embodiment provides an exemplary solution where the oil passage hole is square.

[0059] Please refer to Figure 7 and Figure 9In this embodiment, the lamination unit 1 includes a ring-shaped stator yoke unit 11 and a plurality of stator tooth units 12 protruding from the inner circumferential surface of the stator yoke unit 11. A winding slot unit 13 is formed between any two adjacent stator tooth units 12. The plurality of stator tooth units 12 are evenly distributed along the circumferential direction of the lamination unit 1, and the plurality of winding slot units 13 are also evenly distributed along the circumferential direction of the lamination unit 1. The included angle between the center lines of any two adjacent winding slot units 13 is α. An oil passage hole is provided in the stator yoke unit 11.

[0060] In this embodiment, each stacked assembly 10 includes at least two stacked units 1, that is, each circulating oil channel 2 includes at least two oil passages, and several secondary oil passages in each circulating oil channel 2 can be configured to include one or more flow area specifications as needed.

[0061] Specifically, such as Figure 2 and Figure 3 As shown, Figure 2 and Figure 3 The circulating oil passage 2 shown includes a scheme with four oil passages, which have three different flow area specifications. Specifically, there is one primary oil passage 111 and the other three are secondary oil passages. The three secondary oil passages are divided into two types according to their flow area specifications: secondary oil passage 112 and tertiary oil passage 113. The flow area of ​​the secondary oil passage 112 is smaller than that of the primary oil passage 111 but larger than that of the tertiary oil passage 113. There are two secondary oil passages 112 and one tertiary oil passage 113. Along the axial direction of the stator core 100, the four oil passages of the circulating oil channel 2 are arranged in the following order: primary oil passage 111 - secondary oil passage 112 - tertiary oil passage 113 - secondary oil passage 112. When the cooling oil flows through the circulating oil channel 2, the primary oil passage 111, secondary oil passage 112 and tertiary oil passage 113 cause the flow area of ​​the circulating oil channel 2 to achieve three-level scaling, so as to form a strong turbulence effect, thereby ensuring sufficient heat exchange between the cooling oil and the stator core 100. It should be noted that the arrangement order of the four oil passages in the circulating oil passage 2 can also be: secondary oil passage 112 - tertiary oil passage 113 - secondary oil passage 112 - primary oil passage 111, tertiary oil passage 113 - secondary oil passage 112 - primary oil passage 111 - secondary oil passage 112, or secondary oil passage 112 - primary oil passage 111 - secondary oil passage 112 - tertiary oil passage 113.

[0062] like Figure 4 As shown, Figure 4The circulating oil channel 2 shown includes a scheme with six oil passages. These six oil passages also have three different flow area specifications. Specifically, there are two primary oil passages 111 and the other four are secondary oil passages. The four secondary oil passages are divided into two types according to their flow area specifications: secondary oil passages 112 and tertiary oil passages 113. There are two secondary oil passages 112 and two tertiary oil passages 113. Along the axial direction of the stator core 100, the arrangement sequence of the six oil passages in the circulating oil channel 2 is: primary oil passage 111 - secondary oil passage 112 - tertiary oil passage 113 - primary oil passage 111 - tertiary oil passage 113 - secondary oil passage 112. When the cooling oil flows through the circulating oil channel 2, it can achieve two three-stage expansion and contraction, which can form a stronger turbulence effect, thereby ensuring sufficient heat exchange between the cooling oil and the stator core 100. It should be noted that the arrangement of the six oil passages in the circulating oil passage 2 can also be achieved by moving the upstream parts of the above arrangement to the downstream. For example, the arrangement of the three-stage oil passage 113-the first-stage oil passage 111-the three-stage oil passage 113-the second-stage oil passage 112-the first-stage oil passage 111-the second-stage oil passage 112 means that the upstream first-stage oil passage 111 and the second-stage oil passage 112 have been moved to the downstream.

[0063] In other embodiments, the number of primary oil passages 111 and the number of secondary oil passages in the circulating oil passage 2 can be selected according to actual needs. Furthermore, the number of secondary oil passages classified according to different flow area specifications, as well as the number of oil passages included in each flow area specification, can be selected according to actual needs.

[0064] Alternatively, please refer to Figure 2 The centerlines of all the oil passages in the circulating oil passage 2 coincide. This arrangement allows oil passages with different flow area specifications to scale with the centerline as a reference, forming a central scaling oil passage.

[0065] Preferably, such as Figure 2 As shown, the scaling reference lines of each circulating oil passage 2 coincide, thus forming a single-sided scaling oil passage. Specifically, the scaling reference line coincides with the center line of the primary oil passage 111, that is, each secondary oil passage is scaled with the center line of the primary oil passage 111 as the scaling origin.

[0066] Alternatively, please refer to Figure 3 and Figure 4The circulating oil passage 2 includes a scaling reference line, which coincides with the wall of each oil passage in the circulating oil passage 2. This arrangement allows oil passages of different flow area specifications to be scaled relative to the reference line, forming a scaling oil path. The scaling reference line refers to the secondary oil passage, which is scaled by a certain proportion based on the primary oil passage 111, with the scaling reference line as the origin.

[0067] like Figure 4 As shown, in any two adjacent circulation oil passages 2, the scaling reference lines of the two circulation oil passages 2 are spaced apart, and in any three adjacent circulation oil passages 2, the scaling reference lines of the two circulation oil passages on both sides coincide, thus forming an interlaced scaling oil circuit. Specifically, the scaling reference line of one circulation oil passage 2 coincides with the left side wall of the primary oil passage 111, and the scaling reference line of the other circulation oil passage 2 coincides with the right side wall of the primary oil passage 111. Alternatively, the scaling reference line of one circulation oil passage 2 coincides with the upper side wall of the primary oil passage 111, and the scaling reference line of the other circulation oil passage 2 coincides with the lower side wall of the primary oil passage 111.

[0068] Alternatively, please refer to Figure 1 The stator core 100 includes two first segments 1001, an intermediate segment 1002, and two second segments 1003. Along the axial direction of the stator core 100, one second segment 1003, one first segment 1001, an intermediate segment 1002, another first segment 1001, and another second segment 1003 are stacked sequentially. The first segment 1001 is provided with an oil collecting ring cavity, and the second segment 1003 is provided with multiple spray holes. The oil collecting ring cavity is connected to each cooling oil passage 1004 of each first segment 1001. In any adjacent first segment 1001 and second segment 1003, multiple cooling oil passages 1004 are connected to multiple spray holes in a one-to-one correspondence. With this configuration, the cooling oil is transported through the motor housing to the oil collecting ring cavity, and then distributed to each of the cooling oil channels 1004 in the two first sections 1001 to exchange heat with the stator core 100. After the cooling oil flows out from each cooling oil channel 1004, it enters the corresponding spray hole and is sprayed onto the end of the stator winding to cool the part of the stator winding that extends out of the stator core 100.

[0069] The intermediate segment 1002 is formed by stacking multiple second laminations along the axial direction of the stator core 100, and the second segment 1003 is formed by stacking multiple third laminations along the axial direction of the stator core 100. The main function of the oil collecting ring cavity is to store cooling oil and balance the pressure of the multiple oil injection ports provided thereon. The oil injection ports are used to connect to the cooling oil passage 1004.

[0070] In this embodiment, both the second and third laminations are provided with stator yoke units 11, stator tooth units 12, and winding slot units 13. Along the axial direction of the stator core 100, each stator yoke unit 11 is stacked sequentially to form the stator yoke of the stator core 100; each stator tooth unit 12 is stacked sequentially to form the stator tooth of the stator core 100; and each winding slot unit 13 is connected sequentially to form the winding slot of the stator core 100.

[0071] Specifically, the stator yoke is the part on the stator core 100 that connects to the stator teeth, fixing the stator teeth and ensuring that the relative positions of the various parts of the motor stator remain unchanged. The stator teeth are the protruding tooth-shaped structures on the stator core 100, separating adjacent winding slots and serving as the main pathway for the stator magnetic field. The winding slots are the missing or recessed portions on the inner circumference of the annular stator core 100, used for winding copper wire.

[0072] Alternatively, please refer to Figures 5 to 6 Each oil passage on each stacked unit 1 has the same shape and flow area. Specifically, along the circumference of the stacked unit 1, multiple oil passages are evenly distributed, and the flow areas of the multiple oil passages are of the same specification and shape. This arrangement facilitates processing.

[0073] Specifically, taking the circulating oil passage 2 as an example, which includes four oil passages arranged in the order of primary oil passage 111 - secondary oil passage 112 - tertiary oil passage 113 - secondary oil passage 112, the following explanation is provided. The lamination group 10 corresponding to the circulating oil passage 2 includes four lamination units 1. Along the axial direction of the stator core 100, the four lamination units 1 are A1 lamination unit, B1 lamination unit, C1 lamination unit, and D1 lamination unit. The oil passages on the A1 lamination unit are all primary oil passages 111, the oil passages on the B1 lamination unit are all secondary oil passages 112, the oil passages on the C1 lamination unit are all tertiary oil passages 113, and the oil passages on the D1 lamination unit are all secondary oil passages 112. During the assembly of the lamination group 10, the lamination group 10 is stacked in the order of A1 lamination unit, B1 lamination unit, C1 lamination unit and D1 lamination unit. The multiple oil passages of A1 lamination unit, B1 lamination unit, C1 lamination unit and D1 lamination unit are connected one by one to form the circulating oil channel 2. Then, the multiple assembled lamination groups 10 are stacked sequentially along the axial direction of the stator core 100 to form the first segment 1001.

[0074] Alternatively, please refer to Figures 7 to 9The lamination group 10 includes N lamination units 1. The multiple oil passages on each lamination unit 1 are divided into M circumferential oil passage groups 3. The M circumferential oil passage groups 3 are evenly distributed along the circumferential direction of the lamination unit 1, and each circumferential oil passage group 3 includes a×N oil passages arranged sequentially along the circumferential direction of the lamination unit 1, where a and N are both positive integers, N≥2, and N×M=360° / α. Along the axial direction of the stator core 100, the multiple oil passages in the circulation oil channel 2 are sequentially: first oil passage, second oil passage...nth oil passage, where n is an integer greater than or equal to 2. Along the circumferential direction of the stator core 100, the a×N oil passages in each circumferential oil passage group 3 are sequentially: a first oil passage, a second oil passage...a nth oil passage. The relative deflection angle between any two adjacent lamination units 1 is α. This configuration ensures that all stacked units 1 have the same structure, thereby reducing the variety of stacked units 1 and lowering processing costs. The value of 'a' can be set according to actual needs.

[0075] Specifically, with a=2, the circulating oil passage 2 includes four oil passages, and the first oil passage is a primary oil passage 111, the second oil passage is a secondary oil passage 112, the third oil passage is a tertiary oil passage 113, and the fourth oil passage is a secondary oil passage 112. The four oil passages are arranged in the order of primary oil passage 111-secondary oil passage 112-tertiary oil passage 113-secondary oil passage 112. The lamination group 10 corresponding to the circulating oil channel 2 includes four lamination units 1. Along the axial direction of the stator core 100, the four lamination units 1 are A2 lamination unit, B2 lamination unit, C2 lamination unit and D2 lamination unit. Among them, A2 lamination unit is provided with multiple circumferential oil hole groups 3 along its circumferential direction. Each circumferential oil hole group 3 includes 8 oil passages. The 8 oil passages along the circumferential direction of A2 lamination unit (such as counterclockwise direction) are, in sequence, two primary oil passages 111, two secondary oil passages 112, two tertiary oil passages 113 and two secondary oil passages 112. The structures of stacked units B2, C2, and D2 are the same as those of stacked unit A2. When assembling stacked unit 10, stacked unit 10 is stacked in the order of stacked units A2, B2, C2, and D2. Stacked unit B2 is deflected counterclockwise by α relative to stacked unit A2, stacked unit C2 is deflected counterclockwise by α relative to stacked unit B2, and stacked unit D2 is deflected counterclockwise by α relative to stacked unit C2. In the axial direction, the oil passages on stacked units A2, B2, C2, and D2 can be connected sequentially in the order of primary oil passage 111 - secondary oil passage 112 - tertiary oil passage 113 - secondary oil passage 112, thus completing the assembly of stacked unit 10.

[0076] Preferably, please refer to Figures 10 to 12When N=2 and n=2; along the axial direction of the stator core 100, the two oil passages in the circulating oil channel 2 are, in sequence, a first oil passage and a second oil passage; along the circumferential direction of the stator core 100, the 2a oil passages in each circumferential oil hole group 3 are, in sequence, a first oil passages and a second oil passages; the lamination unit 1 has a first axial end face and a second axial end face, and along the axial direction of the stator core 100, for any two adjacent lamination units 1 in the first segment 1001, the first axial end face of one lamination unit 1 coincides with the second axial end face of the other lamination unit 1. With this configuration, when assembling the lamination group 10, adjacent lamination units 1 do not need to be deflected along the circumferential direction, but only need to be stacked alternately, further reducing the complexity of assembly.

[0077] Specifically, taking a=2, the circulating oil channel 2 includes two oil passages, with the first oil passage being a primary oil passage 111 and the second oil passage being a secondary oil passage 112. The two oil passages are arranged in the order of primary oil passage 111 to secondary oil passage 112 as an example. The lamination group 10 corresponding to the circulating oil channel 2 includes two lamination units 1. Along the axial direction of the stator core 100, the two lamination units 1 are A3 lamination unit and B3 lamination unit. The A3 lamination unit has multiple circumferential oil passage groups 3 arranged along its circumference. Each circumferential oil passage group 3 includes two oil passages, arranged in a counter-clockwise direction along the A3 lamination unit as primary oil passage 111 to secondary oil passage 112. The B3 lamination unit has the same structure as the A3 lamination unit. When assembling the lamination group 1... When the lamination unit is 0, it is stacked in the order of A3 lamination unit - B3 lamination unit, and the first axial end face of A3 lamination unit is in contact with the second axial end face of B3 lamination unit, or the second axial end face of A3 lamination unit is in contact with the first axial end face of B3 lamination unit. Along the axial direction of stator core 100, the oil passage holes on A3 lamination unit and B3 lamination unit can be connected in the order of first-level oil passage hole 111 - second-level oil passage hole 112. The assembly method is simpler, and the assembly of lamination group 10 is completed.

[0078] Alternatively, please refer to Figures 5 to 7 Each lamination unit 1 is provided with a positioning through hole 114, and the center lines of the positioning through holes 114 on each lamination unit 1 coincide along the axial direction of the stator core 100. By providing the positioning through holes 114, it is convenient to assemble the first segment 1001 of the stator core 100, while ensuring the stability of the positional relationship of each lamination unit 1.

[0079] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A motor stator, characterized in that, The motor stator includes a stator core (100), the stator core (100) includes a first segment (1001), the first segment (1001) includes a plurality of lamination groups (10) stacked sequentially along the axial direction of the stator core (100), the lamination group (10) includes a plurality of lamination units (1) stacked sequentially along the axial direction of the stator core (100), the first segment (1001) is provided with a plurality of cooling oil channels (1004), the plurality of cooling oil channels (1004) are evenly distributed along the circumferential direction of the first segment (1001), each cooling oil channel (1004) is formed by sequentially connecting the circulating oil channels (2) provided in each lamination group (10), each circulating oil channel (2) in the lamination group (10) is formed by sequentially connecting the oil passages provided in each lamination unit (1), and the flow areas of any two adjacent oil passages are different; Each of the circulating oil passages (2) includes a plurality of primary oil passages (111) and a plurality of secondary oil passages, and the flow area of ​​the primary oil passages (111) is greater than the flow area of ​​any of the secondary oil passages; along the axial direction of the stator core (100), the center lines of each of the primary oil passages (111) in the cooling oil passages (1004) coincide, and the projections of each of the secondary oil passages are all located within the coverage area of ​​the projection of the primary oil passages (111).

2. The motor stator according to claim 1, characterized in that, The centerlines of each of the oil passages in the circulating oil passage (2) coincide.

3. The motor stator according to claim 1, characterized in that, The circulating oil passage (2) includes a scaling reference line that coincides with the wall of each of the oil passages in the circulating oil passage (2).

4. The motor stator according to claim 3, characterized in that, The scaling reference lines of each of the circulating oil passages (2) coincide; or, In any two adjacent circulating oil passages (2), the scaling reference lines of the two circulating oil passages (2) are set at intervals, and in any three adjacent circulating oil passages (2), the scaling reference lines of the two circulating oil passages (2) on both sides coincide.

5. The motor stator according to claim 1, characterized in that, The stator core (100) includes two first segments (1001), and the stator core (100) also includes an intermediate segment (1002) and two second segments (1003). Along the axial direction of the stator core (100), one second segment (1003), one first segment (1001), the intermediate segment (1002), another first segment (1001), and another second segment (1003) are stacked sequentially. The first segment (1001) is provided with an oil collecting ring cavity, and the second segment (1003) is provided with multiple spray holes. The oil collecting ring cavity is connected to each of the cooling oil passages (1004) of each first segment (1001). In any adjacent first segment (1001) and second segment (1003), the multiple cooling oil passages (1004) are connected to the multiple spray holes in a one-to-one correspondence; and / or, Each of the lamination units (1) is provided with a positioning through hole (114), and the center lines of the positioning through holes (114) on each of the lamination units (1) coincide along the axial direction of the stator core (100).

6. The motor stator according to any one of claims 1-5, characterized in that, Each of the oil passages on each of the stacked units (1) has the same shape and the same flow area.

7. The motor stator according to any one of claims 1-5, characterized in that, Each of the lamination units (1) is provided with a plurality of winding slot units (13), and the plurality of winding slot units (13) are evenly distributed along the circumferential direction of the lamination unit (1), and the included angle between the center lines of any two adjacent winding slot units (13) is α. The stacked plate group (10) includes N stacked plate units (1), and the multiple oil passage holes on each stacked plate unit (1) are divided into M circumferential oil passage groups (3). The M circumferential oil passage groups (3) are evenly distributed along the circumferential direction of the stacked plate unit (1), and each circumferential oil passage group (3) includes a×N oil passage holes arranged sequentially along the circumferential direction of the stacked plate unit (1), where a and N are both positive integers, N≥2, and N×M=360° / α; Along the axial direction of the stator core (100), the plurality of oil passages in the circulating oil passage (2) are sequentially: first oil passage, second oil passage... nth oil passage, where n is an integer greater than or equal to 2; Along the circumferential direction of the stator core (100), the a×N oil passages of each circumferential oil hole group (3) are as follows: a first oil passage, a second oil passage, ... a nth oil passage; The relative deflection angle between any two adjacent stacked units (1) is α.

8. The motor stator according to claim 7, characterized in that, N = 2 and n = 2; along the axial direction of the stator core (100), the two oil passages in the circulating oil passage (2) are, in sequence, the first oil passage and the second oil passage; Along the circumferential direction of the stator core (100), the 2a oil passages of each circumferential oil hole group (3) are: a first oil passage and a second oil passage. The lamination unit (1) has a first axial end face and a second axial end face. Along the axial direction of the stator core (100), in any two adjacent lamination units (1) in the first segment (1001), the first axial end face of one lamination unit (1) coincides with the second axial end face of the other lamination unit (1).

9. An oil-cooled motor, characterized in that, The motor includes a motor housing, a rotor shaft, a rotor, and a motor stator as described in any one of claims 1-8. The motor stator further includes a stator winding disposed on the stator core (100). The rotor shaft is rotatably disposed on the motor housing, the rotor is fixedly disposed on the rotor shaft, and the stator core (100) is fixedly disposed inside the motor housing, with the stator core (100) being spacedly sleeved on the rotor. The motor housing is provided with an oil inlet channel, which is used to supply cooling oil to each of the cooling oil passages (1004).

10. A vehicle, characterized in that, The vehicle includes the oil-cooled motor as described in claim 9, and further includes a gearbox, wherein the oil-cooled motor is drive-connected to the input shaft of the gearbox.

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