Stator assembly, motor, powertrain and vehicle

Abstract

This invention discloses a stator assembly, a motor, a powertrain, and a vehicle. The stator assembly includes: a stator core having stator slots with 1 to M slot layers; a stator winding including m-phase windings, each branch of each phase winding including two I-type conductors and multiple U-type conductors connected in series between the two I-type conductors; the branch is wound from the M slot layer to the 1 slot layer and then wound back to the M slot layer; the slot portion of the I-type conductors is located in the M slot layer; the multiple U-type conductors include a first conductor and a second conductor, the slot portion of the first conductor is located in the 1 slot layer, the first conductors in the same pole pitch region of multiple branches have different pitches and the pitch is z / p-1 or z / p+1; the slot portions of the second conductors are located in the 2nd and 3rd slot layers, the second conductors in the same branch have different pitches, the first conductors in the same pole pitch region of multiple branches have different pitches and the pitch is z / p-1 or z / p+1; the slot portions of the remaining U-type conductors are located in adjacent slot layers and the pitch is z / p. The stator assembly according to this embodiment has a small number of conductor wire types.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more specifically, to a stator assembly, an electric motor, a powertrain, and a vehicle. Background Technology

[0002] With the development of flat wire motor technology, the number of layers in the stator winding is increasing, which further leads to an increase in the wire shape of the flat wire conductor, making the winding manufacturing process more complex and the production cost higher. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide a stator assembly that can improve the problem of excessive conductor wire number in stator windings.

[0004] The present invention also proposes an electric motor having the above-described stator assembly.

[0005] The present invention also proposes a powertrain having the above-mentioned motor.

[0006] The present invention also proposes a vehicle having the above-mentioned motor or powertrain.

[0007] According to an embodiment of the present invention, a stator assembly includes: a stator core having z stator slots arranged circumferentially along the stator core, each stator slot having 1 to M slot layers arranged radially from the inside out or from the outside in, where M is an even number greater than or equal to 4; a stator winding mounted on the stator core and including m phase windings, each phase winding including multiple branches, each branch including multiple conductors connected in series, the multiple conductors including two I-type conductors and multiple U-type conductors connected in series between the two I-type conductors, each I-type conductor including a slot portion and a connecting portion disposed at both ends of the slot portion, each U-type conductor including two slot portions, a bent portion connecting one end of the two slot portions and a connecting portion disposed at the other end of the slot portion, the connecting portions of two adjacent conductors in the series path being connected; the branch winding is wound from the M slot layer to the 1 slot layer and then wound back to the M slot layer. The I-type conductor has a slot portion located in the M-slot layer. The stator assembly has a pole number of p. The plurality of U-shaped conductors include a first conductor and a second conductor. The two slot portions of the first conductor are located in the 1-slot layer of different stator slots. The pitches of the first conductors in the same pole pitch region corresponding to multiple branches are different, and the pitches of the first conductors are z / p-1, z / p, or z / p+1. The two slot portions of the second conductor are located in the 2-slot layer and the 3-slot layer of different stator slots, respectively. The pitches of the second conductors in the same branch are different. The pitches of the second conductors in the same pole pitch region corresponding to multiple branches are different, and the pitches of the second conductors are z / p-1, z / p, or z / p+1. The two slot portions of the remaining U-shaped conductors are located in adjacent slot layers of different stator slots, and the pitches of the remaining U-shaped conductors are z / p.

[0008] According to the stator assembly of the present invention, the stator winding is wound from slot M to slot 1 and then back to slot M, which improves the loop current problem and facilitates long-term motor operation. Furthermore, the conductors of the stator winding are type I conductors and type U conductors 21, and the number of conductor types is M+3 or M+5, which improves the problem of excessive conductor wire types, simplifies the winding process, and helps to reduce production costs.

[0009] In addition, the stator assembly according to the above embodiments of the present invention may also have the following additional technical features:

[0010] According to some embodiments of the present invention, the plurality of U-shaped conductors include n first conductor groups, a second conductor group, a third conductor group, a fourth conductor group, and n first conductor groups connected in series. Each first conductor group includes p / 2-1 third conductors and one fourth conductor. Each second conductor group includes p / 2-1 of the third conductors and one second conductor. Each third conductor group includes p / 2-1 of the third conductors, one first conductor, and p / 2-1 of the third conductors. Each fourth conductor group includes one second conductor and p / 2-1 of the third conductors, where n = M / 2-2. The third conductors in the first conductor groups... The two slot portions of the conductor are located in slot i and slot i+1, where i is an odd number greater than 4 and less than M; the two slot portions of the third conductor in the second conductor group are located in slot 3 and slot 4; the two slot portions of the third conductor in the third conductor group are located in slot 1 and slot 2; the two slot portions of the fourth conductor are located in slot i and slot i-1; the two connecting portions of the first conductor have the same bending direction, the two connecting portions of the second conductor extend away from each other, the two connecting portions of the third conductor extend away from each other, and the two connecting portions of the fourth conductor extend away from each other.

[0011] According to some embodiments of the present invention, each phase winding includes a branches, and the number of conductors in the same slot layer of the a branches is equal. The z / (p×m) stator slots that are adjacent in the axial direction of the stator core constitute a stator slot group for installing the same phase winding, and the number of conductors in the same stator slot group of the a branches is equal.

[0012] According to some embodiments of the present invention, each phase winding includes two branches, which are connected in parallel; or, the type I conductor at the end of the series connection of one branch is connected to the type I conductor at the beginning of the series connection of the other branch through the connecting portion, thereby connecting the two branches in series.

[0013] According to some embodiments of the present invention, each phase winding includes two branches, the pitches of the first conductors of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, the pitches of the second conductors of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, and the pitches of the two second conductors corresponding to the same branch are z / p-1 and z / p+1.

[0014] According to some embodiments of the present invention, the slot portion is located within the stator slot, the bent portion of the plurality of U-shaped conductors is located at one axial end of the stator core, the connecting portion of the plurality of U-shaped conductors is located at the other axial end of the stator core, each phase winding includes a parallel branch, and in each branch, the connecting portion of two I-shaped conductors that are not connected to the U-shaped conductor is formed as a lead portion and a neutral point portion.

[0015] According to some embodiments of the present invention, the lead portion of the same phase winding is located in a plurality of consecutive stator slots corresponding to the slot portion, and the neutral point portion of the same phase winding is located in a plurality of consecutive stator slots corresponding to the slot portion; the neutral point portion of the multi-phase winding is connected to the same neutral point connector, and the lead portion of the same phase winding is connected to the same lead connector.

[0016] According to some embodiments of the present invention, the number of slots z of the stator core is 24, 48 or 72.

[0017] The motor according to an embodiment of the present invention includes a stator assembly according to an embodiment of the present invention.

[0018] The powertrain according to an embodiment of the present invention includes an electric motor according to an embodiment of the present invention.

[0019] The vehicle according to an embodiment of the present invention includes an electric motor according to an embodiment of the present invention or a powertrain according to an embodiment of the present invention.

[0020] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0022] Figure 1 This is a schematic diagram of the stator winding according to the first embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the stator winding according to the second embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the stator winding according to the third embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the stator winding according to an embodiment of the present invention;

[0026] Figure 5 and Figure 6This is a structural schematic diagram of a stator assembly at different angles according to a first embodiment of the present invention, wherein the neutral point connector and the lead connector are not shown;

[0027] Figure 7 This is a schematic diagram of the stator assembly according to the first embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the stator core structure according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the stator core and U-phase winding according to the first embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the stator core and V-phase winding according to the first embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the stator core and W-phase winding according to the first embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the structure of the U-phase winding according to the first embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the structure of branch U1 according to the first embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the structure of the U2 branch according to the first embodiment of the present invention;

[0035] Figure 15 This is a schematic diagram of the structure of a type I conductor according to the first embodiment of the present invention;

[0036] Figure 16 This is a schematic diagram of the structure of different first conductors according to the first embodiment of the present invention, wherein (a) is a short-pitch first conductor and (b) is a long-pitch first conductor;

[0037] Figure 17 These are schematic diagrams of different second conductors according to the first embodiment of the present invention, wherein (a) is a short-pitch second conductor and (b) is a long-pitch second conductor;

[0038] Figure 18 This is a schematic diagram of the structure of different U-shaped conductors according to the first embodiment of the present invention, wherein (a) is a third conductor bridging the 1st and 2nd slot layers, (b) is a third conductor bridging the 3rd and 4th slot layers, (c) is a fourth conductor bridging the 4th and 5th slot layers, and (d) is a third conductor bridging the 5th and 6th slot layers.

[0039] Figure 19 This is a schematic diagram of the structure of the connecting portion according to some embodiments of the present invention;

[0040] Figure 20 This is a schematic diagram of the structure of the connecting portion according to other embodiments of the present invention;

[0041] Figure 21 This is a schematic diagram of a vehicle according to an embodiment of the present invention.

[0042] Figure label:

[0043] Electric motor 1000; Powertrain 2000; Vehicle 3000;

[0044] Stator assembly 100;

[0045] Stator core 10; stator slot 101; weld slot 102;

[0046] Stator winding 20; slot portion 201; bending portion 202; connecting portion 203;

[0047] Type I conductor 21; Type U conductor 22; First conductor 23; Second conductor 24; Third conductor 25; Fourth conductor 26;

[0048] Neutral point connector 31; lead wire connector 32. Detailed Implementation

[0049] Embodiments of the present invention 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 the present invention, and should not be construed as limiting the present invention.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 invention 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 invention.

[0051] In the description of this invention, "first feature" and "second feature" may include one or more of the features, "multiple" means two or more, "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them, and "above," "over," and "on top" the second feature may include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0052] The stator assembly 100 according to an embodiment of the present invention is described below with reference to the accompanying drawings.

[0053] Reference Figures 1-7 As shown, the stator assembly 100 according to an embodiment of the present invention may include: a stator core 10 and a stator winding 20.

[0054] Specifically, the stator core 10 has z stator slots 101 arranged circumferentially along the stator core 10. Each stator slot 101 has 1 to M slot layers arranged radially from the inside out or from the outside in, where M is an even number greater than or equal to 4. For example Figure 1 and Figure 5 As shown, each stator slot 101 has 6 slot layers, i.e., M=6. The 6 slot layers are arranged radially outward as slot layer 1, slot layer 2, slot layer 3, slot layer 4, slot layer 5, and slot layer 6. Of course, in some other embodiments, the 6 slot layers can also be arranged radially from the outside inward as slot layer 1, slot layer 2, slot layer 3, slot layer 4, slot layer 5, and slot layer 6. The following description, with reference to the accompanying drawings, uses slot layer 1 as the innermost slot layer and slot layer M as the outermost slot layer as an example. According to the following description, it will be understood by those skilled in the art that slot layer 1 is the outermost slot layer and slot layer M is the innermost slot layer.

[0055] Here, "slot layer" refers to the position of the slot portion 201 in the stator slot 101 where conductors of the stator winding 20 can be arranged. M slot layers represent the slot portion 201 in the stator slot 101 where M conductors can be arranged in a single row. In the stator winding 20 formed, the number of conductor layers in each stator slot 101 is M.

[0056] For example, such as Figures 5-8 As shown, the stator core 10 may include an annular yoke and multiple teeth evenly distributed circumferentially on the inner or outer circumferential surface of the yoke. Each tooth extends axially along the stator core 10, and a stator slot 101 is formed between two adjacent teeth. The stator core 10 is formed of multiple stacked silicon steel sheets, which are then welded into a whole through weld grooves 102 on the outer circumferential surface. The two axial ends of the stator core 10 are respectively motor wiring terminals (e.g., ...). Figure 5 The upper end shown) and the motor welding end (as shown) Figure 5(See the lower end shown). Each conductor can be inserted into the stator slot 101 through the motor wiring terminal and connected at the motor welding end.

[0057] The stator winding 20 is mounted on the stator core 10, and the stator winding 20 includes m-phase windings so that they are different from each other in electrical phase. Each phase winding includes multiple branches, which can be connected in parallel or in series. For example... Figures 1-4 As shown, the stator winding 20 includes two parallel branches.

[0058] Reference Figures 9-18 As shown, each branch includes multiple conductors connected in series. These conductors include two I-type conductors 21 and multiple U-type conductors 22 connected in series between the two I-type conductors 21. The I-type conductor 21 includes a slotted portion 201 and connecting portions 203 at both ends of the slotted portion 201. The U-type conductor 22 includes two slotted portions 201, a bent portion 202 connecting one end of the two slotted portions 201, and a connecting portion 203 at the other end of the slotted portion 201. The connecting portions 203 of adjacent conductors in the series path are connected to achieve series connection of multiple conductors. The series connection of multiple conductors forms a branch, ensuring that the connection structures of adjacent conductors in the branch are all located at the same axial end of the stator core 10, facilitating connection operations. The connecting portions 203 of the I-type conductors 21 that are not connected to other conductors are located at the other end of the stator core 10, facilitating connection of the aforementioned connecting portions 203 of the I-type conductors 21 to the connecting terminals.

[0059] The connection method of the connecting part 203 includes, but is not limited to, welding. It is worth noting that the shape of the connecting part 203 can be as follows: Figure 20 The diagram shows an inclined segment and a straight segment. The straight segment extends parallel to the axial direction of the stator assembly 100, and the inclined segment extends inclined relative to the axial direction of the stator assembly 100. The connecting portion 203 can also be other shapes, such as... Figure 19 The diagram only shows the inclined section. Furthermore, the bent portion 202 and the connecting portion 203 can extend along one or more of the following shapes: straight line, arc, broken line, etc., all of which are within the protection scope of this invention.

[0060] The branch circuit is wound from slot M to slot 1 and then back to slot M. In other words, multiple conductors in a branch circuit can be connected in series to wind from the innermost slot to the outermost slot and then back to the innermost slot; or from the outermost slot to the innermost slot and then back to the outermost slot. The resulting stator assembly 100 has a relatively symmetrical structure on the magnetic circuit, which helps to eliminate loop current problems caused by asymmetrical structures.

[0061] In this design, the slot portion 201 of the type I conductor 21 is located in the M slot layer. The stator assembly 100 corresponds to a pole number of p, and multiple U-shaped conductors 22 include a first conductor 23 and a second conductor 24. The two slot portions 201 of the first conductor 23 are located in the 1 slot layer of different stator slots 101. The pitches of the first conductor 23 in the same pole pitch region corresponding to multiple branches are different, and the pitch of the first conductor 23 is z / p-1, z / p, or z / p+1. For example... Figure 1 As shown, the pitch of the first conductor 23 in slots 37-44 of branch U1 is z / p+1, and the pitch of the first conductor 12 in slots 38-43 of branch U2 is z / p-1; in another example, in an embodiment where the stator winding 20 includes three branches, the pitches of the first conductors 23 corresponding to the three branches within the same pole pitch region can be z / p-1, z / p, and z / p+1, respectively. The pole pitch region refers to the stator slot 101 within the range of slots occupied by one magnetic pole.

[0062] The two slot portions 201 of the second conductor 24 are located in the 2nd and 3rd slot layers of different stator slots 101, respectively. The pitch of the second conductor 24 in the same branch is different, and the pitch of the second conductor 24 in the same pole pitch region corresponding to multiple branches is different. Moreover, the pitch of the second conductor 24 is z / p-1, z / p, or z / p+1. For example Figure 1 As shown, in branch U1, the pitch of the second conductor 24 corresponding to slots 38-43 is z / p-1, and the pitch of the second conductor 24 corresponding to slot 43-2 is z / p+1. In branch U2, the pitch of the second conductor 24 corresponding to slots 37-44 is z / p+1, and the pitch of the second conductor 24 corresponding to slot 44-1 is z / p-1. The second conductor 24 corresponding to slots 38-43 in branch U1 and slots 37-44 in branch U2 are in the same pole pitch region, and the second conductor 24 corresponding to slots 43-2 in branch U1 and slots 44-1 in branch U2 are in the same pole pitch region.

[0063] The two slot portions 201 of the remaining U-shaped conductors 22 are located in adjacent slot layers of different stator slots 101, and the pitch of the remaining U-shaped conductors 22 is z / p.

[0064] The pitch (or span) is the distance between two slot portions 201 of the same conductor along the circumference of the stator core 10, measured in slots. For example, a pitch of 6 stator slots 101 between two slot portions 201 can be understood as two slot portions 201 being able to be inserted into slot 1 and slot 7 respectively. The initial slot is slot 1, so after spanning 6 stator slots 101, it becomes slot 7. The pitch measured by the number of slots is equal to the ratio of the number of slots to the number of poles, i.e., z / p, and is called the full pitch. The pitch measured by the number of slots is less than the ratio of the number of slots to the number of poles, such as z / p-1, and is called the short pitch. The pitch measured by the number of slots is greater than the ratio of the number of slots to the number of poles, such as z / p+1, and is called the long pitch. The explanations of "pitch," "full pitch," "short pitch," and "long pitch" will continue below.

[0065] Different conductor shapes require different molds or tooling for production; for example, I-shaped conductor 21 and U-shaped conductor 22 require different molds or tooling. For U-shaped conductor 22, different pitch sizes result in different circumferential spacing between the two slot portions 201, thus affecting the required molds or tooling. For U-shaped conductor 22 with the same pitch, whether the two slot portions 201 are located in the same slot layer of different stator slots 101 (i.e., same-layer U-shaped conductor 22) or in different slot layers of different stator slots 101 (i.e., cross-layer U-shaped conductor 22), the extension path of the U-shaped conductor 22, such as the bend 202, will differ, thus affecting the required molds or tooling. Even for cross-layer U-shaped conductor 22 or same-layer U-shaped conductor 22 with the same pitch, different slot layers result in different radial positions in the stator slots 101, also causing differences in the circumferential spacing between the two slot portions 201, thus affecting the required molds or tooling.

[0066] For example, when the same trench layer is present, short-pitch U-shaped conductors 22 in the same layer (such as...) Figure 16 (a) shown) and long-distance U-shaped conductors 22 in the same layer (as shown) Figure 16 (b) As shown, two different molds or toolings are required for processing, and the short-pitch, multi-layer U-shaped conductor 22 (as shown) Figure 17 (a) shown) and long-span, multi-layer U-shaped conductor 22 (as shown) Figure 17 (b) indicates that two different molds or toolings are required for processing; for example, a cross-layer U-shaped conductor 22 with the same pitch, and a full-pitch U-shaped conductor 22 located in slot 1 and slot 2 (as shown in the image). Figure 18 (a) shown), the full-spacing U-shaped conductor 22 located in the 3rd and 4th slot layers (as shown in the figure), is located in the 3rd and 4th slot layers. Figure 18 (b) shown), the full-spacing U-shaped conductor 22 located in the 4th and 5th slot layers (as shown in the figure), is located in the 4th and 5th slot layers. Figure 18 (c) and the full-spacing U-shaped conductor 22 located in the 5th and 6th slot layers (as shown in the image) Figure 18 (d) As shown, four different molds or toolings are required for processing.

[0067] Therefore, this application uses two type I conductors 21, and all other conductors are U-shaped conductors 22, reducing the number of conductor shape types required for the stator winding 20. Both long-pitch and short-pitch U-shaped conductors 22 in the same layer are arranged in slot 1, and both long-pitch and short-pitch cross-layer U-shaped conductors 22 are arranged in slots 2 and 3, allowing the required long-pitch same-layer U-shaped conductors 22, short-pitch same-layer U-shaped conductors 22, long-pitch cross-layer U-shaped conductors 22, and short-pitch cross-layer U-shaped conductors 22 to be processed using the same molds or tooling. Furthermore, all other conductors are full-pitch cross-layer U-shaped conductors 22, and all full-pitch cross-layer U-shaped conductors 22 located in the same slot can be processed using the same molds or tooling. In summary, the number of conductor types in the stator winding 20 of this application is M+3 or M+5, reducing the number of conductor types required.

[0068] The same slot layer for the slot inner portion 201 of multiple cross-layer U-shaped conductors 22 means that the two slot inner portions 201 of the same U-shaped conductor 22 are located in different slot layers. However, in multiple U-shaped conductors 22, the two slot layers for the two slot inner portions 201 of each U-shaped conductor 22 are the same, for example, they are both located in the first slot layer of one stator slot 101 and the second slot layer of another stator slot 101.

[0069] According to the stator assembly 100 of the present invention, the stator winding 20 is wound from the M slot layer to the 1 slot layer and then back to the M slot layer, which improves the loop current problem and is conducive to the long-term operation of the motor 1000. Furthermore, the conductors of the stator winding 20 are I-type conductors 21 and U-type conductors 22, and the number of conductor types is M+3 or M+5, which improves the problem of excessive conductor wire types, simplifies the winding process, and helps to reduce production costs.

[0070] According to some embodiments of the present invention, such as Figures 1-4 As shown, the multiple U-shaped conductors 22 include n first conductor groups, one second conductor group, one third conductor group, one fourth conductor group, and n first conductor groups connected in series. The first conductor group includes p / 2-1 third conductors 25 and one fourth conductor 26; the second conductor group includes p / 2-1 third conductors 25 and one second conductor 24; the third conductor group includes p / 2-1 third conductors 25, one first conductor 23, and p / 2-1 third conductors 25; the fourth conductor group includes one second conductor 24 and p / 2-1 third conductors 25; n = M / 2-2.

[0071] Among them, such as Figure 1 and Figures 16-18As shown, the two connecting portions 203 of the first conductor 23 bend in the same direction, the two connecting portions 203 of the second conductor 24 extend away from each other, the two connecting portions 203 of the third conductor 25 extend away from each other, and the two connecting portions 203 of the fourth conductor 26 extend away from each other. For the U-shaped conductor 22 with two connecting portions 203 extending away from each other, after being connected in series with other conductors through the connecting portion 203, it can run continuously in one direction along the circumference of the stator core 10 with the series-connected conductors, for example, continuously clockwise or continuously counterclockwise. For the U-shaped conductor 22 with the same bending direction of the connecting portion 203, after being connected in series with other U-shaped conductors 22 through the connecting portion 203, the direction of the branch running upward around the stator core 10 can be changed, for example, from clockwise to counterclockwise, so that the entire branch can run more evenly upward around the stator core 10.

[0072] In the first conductor group, the two slot portions 201 of the third conductor 25 are located in slot i and slot i+1, where i is an odd number greater than 4 and less than M. In the second conductor group, the two slot portions 201 of the third conductor 25 are located in slot 3 and slot 4. In the third conductor group, the two slot portions 201 of the third conductor 25 are located in slot 1 and slot 2. In the fourth conductor 26, the two slot portions 201 are located in slot i and slot i-1.

[0073] For the U-shaped conductors 22 located in slot i and slot i+1, when the value of i is the same, the required U-shaped conductors 22 are all third conductors 25 of the same specification; when the value of i is different, different specifications of third conductors 25 are required, and the size of the third conductor 25 only needs to be changed according to the different adaptability of the slots. Therefore, the stator winding 20 requires M / 2 types of third conductors 25, and similarly requires M / 2-2 types of fourth conductors 26, which helps to reduce the number of types of third conductors 25 and fourth conductors 26.

[0074] In addition, the stator winding 20 only requires one type I conductor 21, two types of first conductors 23 and two types of second conductors 24. The specifications of the type I conductor 21, first conductor 23 and second conductor 24 do not need to be adjusted according to the change of the number of slots and layers, which helps to reduce the number of conductor types and reduce production costs.

[0075] For example Figure 1 As shown, M is 6, and the stator winding 20 includes one type I conductor 21, two types of first conductors 23, two types of second conductors 24, three types of third conductors 25, and one type of fourth conductor 26; for example Figure 2As shown, M is 4, and the stator winding 20 includes one type I conductor 21, two types of first conductors 23, two types of second conductors 24, and two types of third conductors 25. It is worth noting that when M is 4, n is 0; therefore, the stator winding 20 does not include the first conductor group, and the stator assembly 100 does not include the fourth conductor 26. One type I conductor 21 is directly connected to the second conductor group, and the other type I conductor 21 is directly connected to the fourth conductor group. For example... Figure 3 As shown, M is 8, including 1 type I conductor 21, 2 types of first conductor 23, 2 types of second conductor 24, 4 types of third conductor 25, and 2 types of fourth conductor 26.

[0076] In the above embodiments, the winding method of the stator winding 20 is simple, which can improve the problem of excessive conductor wire type and local overheating caused by loop circuit in the magnetic circuit of the stator winding 20, and is conducive to the long-term operation of the motor 1000.

[0077] According to some embodiments of the present invention, such as Figures 1-4 As shown, each phase winding includes *a* branches, and the number of conductors in the same slot layer of the *a* branches is equal. *z* / (p×m) stator slots 101 adjacent in the axial direction of the stator core 10 constitute a stator slot group for installing the same phase winding, and the number of conductors in the same stator slot group of the *a* branches is equal. This ensures that each branch is evenly distributed in both the circumferential and radial directions of the stator core 10, thereby eliminating circulating currents in the stator winding 20 and avoiding the problem of localized overheating.

[0078] For example Figure 1 In the example shown, each phase winding includes two branches, and the number of stator slots 101 is 48. The number of conductors in the same slot layer for both branches is 24. Furthermore, each stator slot group has 2 slots, meaning the number of stator slots 101 per pole per phase is q = 2. Each stator slot 101 has 6 slot layers, and the number of conductors in the same stator slot group for both branches is 6. In addition, the conductors in the same stator slot group for both branches are arranged evenly and alternately in the radial and circumferential directions to improve the uniformity of conductor arrangement and help eliminate circulating current.

[0079] In some embodiments, continue to refer to Figures 1-4 As shown, each phase winding includes two branches, which can be connected in parallel or in series. In the embodiment where the two branches are connected in parallel, the connection portions 203 at both ends of each branch in the series direction can be used to connect to connection terminals, for example... Figure 2 The connecting portions 203 corresponding to the 1-slot 4-slot layer, 2-slot 4-slot layer, 43-slot 4-slot layer, and 44-slot 4-slot layer shown are respectively used for connection with the connecting terminals. In the embodiment of two branches connected in series, the type I conductor 21 at the end of the series connection of one branch is connected to the type I conductor 21 at the beginning of the series connection of the other branch through the connecting portion 203, thereby connecting the two branches in series; for example Figure 2The connection part 203 of the 44-slot 4-slot layer corresponding to the type I conductor 21 is connected to the connection part 203 of the 2-slot 4-slot layer corresponding to the type I conductor 21, so that the U1 branch and the U2 branch are connected in series.

[0080] Therefore, the two branches of the same winding, whether connected in series or in parallel, can use the same wiring method to reduce the number of conductor types and reduce loop current.

[0081] In some embodiments, each phase winding includes two branches, the pitches of the first conductors 23 of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, the pitches of the second conductors 24 of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, and the pitches of the two second conductors 24 corresponding to the same branch are z / p-1 and z / p+1.

[0082] For example Figure 1 As shown, the stator core 10 has 48 stator slots 101 and 8 poles. The pitch of the first conductor 23 corresponding to slot 1 of slot 37 and slot 1 of slot 44 is 7, and the pitch of the first conductor 23 corresponding to slot 1 of slot 38 and slot 1 of slot 43 is 5. The pitch of the second conductor 24 corresponding to slot 3 of slot 3 and slot 2 of slot 43 is 5, the pitch of the second conductor 24 corresponding to slot 3 of slot 43 and slot 2 of slot 2 is 7, the pitch of the second conductor 24 corresponding to slot 3 of slot 3 and slot 2 of slot 44 is 7, and the pitch of the second conductor 24 corresponding to slot 3 of slot 44 and slot 2 of slot 1 is 5.

[0083] Thus, the first conductor 23 in the same stator slot group of the two branches has one long spacing and the other short spacing, and the second conductor 24 in the same stator slot group of the two branches has one long spacing and the other short spacing. They can be located in different stator slots 101 respectively, and the conductors of different branches are in the same slot layer of the stator slot group, so that the two branches are more evenly distributed, which is beneficial to reducing loop current.

[0084] According to some embodiments of the present invention, such as Figures 5-11 As shown, the slot portion 201 is located within the stator slot 101, the bent portions 202 of the plurality of U-shaped conductors 22 are located at one axial end of the stator core 10, and the connecting portions 203 of the plurality of U-shaped conductors 22 are located at the other axial end of the stator core 10. Each phase winding includes a parallel branches, and in each branch, the connecting portions 203 of the two I-shaped conductors 21 that are not connected to the U-shaped conductors 22 are formed as a lead portion and a neutral point portion.

[0085] This allows the connection portion 203 of the two connected conductors to be welded from the same axial end of the stator core 10, and the operation can be performed from the same axial end of the stator core 10, making the connection operation more convenient and efficient. The lead portion and the neutral point portion are located at the motor plug-in end, so that the connecting terminals connected to the lead portion and the connecting terminals connected to the neutral point portion are less likely to interfere with the connection operation between the conductors.

[0086] For example, in some specific embodiments, such as Figure 1 and Figure 6 As shown, each phase winding includes two parallel branches. In the two branches, the connection part 203 used for connecting two adjacent conductors is located at the lower end of the stator core 10. The connection part 203 located at the upper end of the stator core 10 is formed as a lead part or a neutral point part. Specifically, the connection part 203 corresponding to the 1st and 6th slot layers and the 2nd and 6th slot layers is formed as a lead part, and the connection part 203 corresponding to the 43rd and 6th slot layers and the 44th and 6th slot layers is formed as a neutral point part.

[0087] In some specific embodiments, such as Figures 9-12 As shown, the lead portion 201 of the same phase winding is located in a series of stator slots 101, and the neutral point portion 201 of the same phase winding is located in a series of stator slots 101. The neutral point portion of the multi-phase winding is connected to the same neutral point connector 31, and the lead portion of the same phase winding is connected to the same lead connector 32.

[0088] For example Figure 7 , Figures 9-11 The stator assembly 100 shown is a three-phase 48-slot structure with 8 poles. Each phase winding includes two parallel branches. There are three lead wire connectors 32, which are U-phase connection terminals, V-phase connection terminals and W-phase connection terminals, respectively. The two lead portions of the U-phase winding, corresponding to the slot inner portions 201, are located in slot 1 (slot 6) and slot 2 (slot 6) respectively, and are connected by the U-phase connection terminal. The two lead portions of the V-phase winding, corresponding to the slot inner portions 201, are located in slot 5 (slot 6) and slot 6 (slot 6) respectively, and are connected by the V-phase connection terminal. The two lead portions of the W-phase winding, corresponding to the slot inner portions 201, are located in slot 9 (slot 6) and slot 10 (slot 6) respectively, and are connected by the W-phase connection terminal. The two neutral point portions of the U-phase winding, corresponding to the slot inner portions 201, are located in slot 43 (slot 6) and slot 44 (slot 6) respectively. The two neutral point portions of the V-phase winding, corresponding to the slot inner portions 201, are located in slot 47 (slot 6) and slot 48 (slot 6) respectively. The two neutral point portions of the W-phase winding, corresponding to the slot inner portions 201, are located in slot 3 (slot 6) and slot 4 (slot 6) respectively.

[0089] The lead portion 201 of the same winding is located in multiple consecutive stator slots 101, allowing the lead portion of the same winding to be continuously arranged along the circumference of the stator core 10. This facilitates connection with the same lead connector 32, reduces interference with other structures, and results in a smaller size for the lead connector 32. Similarly, the neutral point portion 201 of the same phase winding is located in multiple consecutive stator slots 101, allowing the neutral point portion of the same phase winding to be continuously arranged along the circumference of the stator core 10. This facilitates connection with the same neutral point connector 31. The neutral point portions of multiple phase windings are all connected to the same neutral point connector 31, which helps reduce the number of components and simplifies the wiring method.

[0090] According to some embodiments of the present invention, the number of slots z of the stator core 10 can be 24, 48 or 72. For stator cores 10 with different numbers of slots, the stator winding 20 only needs to adjust the number of third conductors 25 and the number of third conductors 2524 located in the same slot layer for each branch, making winding more convenient and efficient.

[0091] The stator assembly 100 according to some specific embodiments of the present invention is described in detail below with reference to the accompanying drawings. It is to be understood that the following description is merely illustrative and should not be construed as limiting the invention.

[0092] According to the first embodiment of the present invention, the stator assembly 100, such as Figure 1 and Figures 5-18 As shown, the stator assembly 100 includes a stator core 10, a stator winding 20, a neutral point connector 31, and a lead wire connector 32.

[0093] The stator core 10 includes an annular yoke and multiple teeth evenly distributed circumferentially on the inner wall of the yoke. Stator slots 101 are formed between adjacent teeth. The stator core 10 has 48 stator slots 101 arranged circumferentially. Each stator slot 101 has 6 slot layers, including slot layers #1, #2, #3, #4, #5, and #6 arranged radially from the inside out. An insulating element is arranged inside the stator slot 101 to wrap the conductor portion 201 within the slot, thus insulating the conductor from the stator core 10. The outer circumferential surface of the stator core 10 has multiple weld grooves 102 evenly arranged circumferentially. Each weld groove 102 extends axially along the stator core 10 and is used to weld stacked silicon steel sheets together to form the stator core 10.

[0094] The stator winding 20 is mounted on the stator core 10 and includes three-phase windings (U, V, and W), suitable for an 8-pole motor 1000. The three-phase windings are connected in the same way, and the three-phase windings are spaced 120° electrical degrees apart. Each phase winding includes two parallel branches. For example, the U-phase winding includes branches U1 and U2. The lead portions of branches U1 and U2 are adjacent circumferentially, and the neutral points of branches U1 and U2 are also adjacent circumferentially. Each branch includes multiple conductors connected in series. The conductors are flat wire conductors, meaning that the cross-section of the conductor perpendicular to the extension direction is approximately rectangular. The inner portion 201 of the stator slot 101 can extend radially along the long side of the rectangle to allow the flat wires to be stacked along the width direction, or it can extend radially along the short side of the rectangle to allow the flat wires to be stacked along the thickness direction.

[0095] The lead connector 32 is a copper busbar, including a U-phase connection terminal, a V-phase connection terminal, and a W-phase connection terminal. The lead portions of the two branches of each phase winding are connected to the corresponding lead connector 32. The neutral point connector 31 is a copper busbar, which is connected to the neutral point of the three-phase winding.

[0096] Considering the three-phase symmetry of stator winding 20, the specific connection method of stator winding 20 is explained below using the U-phase winding as an example. Based on the following description, the specific connection methods of V-phase winding and W-phase winding can be understood.

[0097] The 8-pole, 48-slot, 6-slot, 2-branch stator winding 20 of this embodiment specifically includes 9 conductor wire types, including 1 type I conductor 21, 2 types of first conductors 23, 2 types of second conductors 24, 3 types of third conductors 25 and 1 type of fourth conductor 26. The U-shaped conductors 22 are: the long-pitch first conductor 23 bridging the same layer of #1 and #1, the short-pitch first conductor 23 bridging the same layer of #1 and #1, the long-pitch second conductor 24 bridging the interlayer of #2 and #3, the short-pitch second conductor 24 bridging the interlayer of #2 and #3, the full-pitch third conductor 25 bridging the interlayer of #1 and #2, the full-pitch third conductor 25 bridging the interlayer of #3 and #4, the full-pitch third conductor 25 bridging the interlayer of #5 and #6, and the full-pitch fourth conductor 26 bridging the interlayer of #4 and #5.

[0098] Combination Figure 1 The conductor connection path of the U1 branch of stator winding 20 is as follows:

[0099] (Type I conductor 21) Slot 1 #6 → (#5#6 interlayer bridging third conductor 25) Slot 7 #5-13 Slot #6 → (#5#6 interlayer bridging third conductor 25) Slot 19 #5-25 Slot #6 → (#5#6 interlayer bridging third conductor 25) Slot 31 #5-37 Slot #6 → (#4#5 interlayer bridging fourth conductor 26) Slot 43 #5-1 Slot #4 → (#3#4 interlayer bridging third conductor 25) Slot 7 #3-13 Slot #4 → (#3#4 interlayer bridging third conductor 2 5) 19 slot #3-25 slot #4 → (#3#4 interlayer bridging third conductor 25) 31 slot #3-37 slot #4 → (#2#3 interlayer bridging second conductor 24) 43 slot #3-2 slot #2 → (#1#2 interlayer bridging third conductor 25) 8 slot #1-14 slot #2 → (#1#2 interlayer bridging third conductor 25) 20 slot #1-26 slot #2 → (#1#2 interlayer bridging third conductor 25) 32 slot #1-38 slot #2 → (#1 same layer bridging first conductor 23) )44 slot #1-37 slot #1 → (#1#2 interlayer bridging third conductor 25) 31 slot #2-25 slot #1 → (#1#2 interlayer bridging third conductor 25) 19 slot #2-13 slot #1 → (#1#2 interlayer bridging third conductor 25) 7 slot #2-1 slot #1 → (#2#3 interlayer bridging second conductor 24) 43 slot #2-38 slot #3 → (#3#4 interlayer bridging third conductor 25) 32 slot #4-26 slot #3 → (#3#4 interlayer bridging third conductor 25) 20 slot #4-14 slot #3 → (#3#4 interlayer bridging third conductor 25) 8 slot #4-2 slot #3 → (#4#5 interlayer bridging fourth conductor 26) 44 slot #4-38 slot #5 → (#5#6 interlayer bridging third conductor 25) 32 slot #6-26 slot #5 → (#5#6 interlayer bridging third conductor 25) 20 slot #6-14 slot #5 → (#5#6 interlayer bridging third conductor 25) 8 slot #6-2 slot #5 → (Type I conductor 21) 44 slot #6.

[0100] The conductor connection route for branch U2 is as follows:

[0101] (Type I conductor 21) 2 slots #6 → (#5#6 interlayer bridging third conductor 25) 8 slots #5-14 slots #6 → (#5#6 interlayer bridging third conductor 25) 20 slots #5-26 slots #6 → (#5#6 interlayer bridging third conductor 25) 32 slots #5-38 slots #6 → (#4#5 interlayer bridging fourth conductor 26) 44 slots #5-2 slots #4 → (#3#4 interlayer bridging third conductor 25) 8 slots #3-14 slots #4 → (#3#4 interlayer bridging third conductor 2 5) 20 slot #3-26 slot #4 → (#3#4 interlayer bridging third conductor 25) 32 slot #3-38 slot #4 → (#2#3 interlayer bridging second conductor 24) 44 slot #3-1 slot #2 → (#1#2 interlayer bridging third conductor 25) 7 slot #1-13 slot #2 → (#1#2 interlayer bridging third conductor 25) 19 slot #1-25 slot #2 → (#1#2 interlayer bridging third conductor 25) 31 slot #1-37 slot #2 → (#1 same layer bridging first conductor 23) )43 slot #1-38 slot #1 → (#1#2 interlayer bridging third conductor 25) 32 slot #2-26 slot #1 → (#1#2 interlayer bridging third conductor 25) 20 slot #2-14 slot #1 → (#1#2 interlayer bridging third conductor 25) 8 slot #2-2 slot #1 → (#2#3 interlayer bridging second conductor 24) 44 slot #2-37 slot #3 → (#3#4 interlayer bridging third conductor 25) 31 slot #4-25 slot #3 → (#3#4 interlayer bridging third conductor 25) 19 slot #4-13 slot #3 → (#3#4 interlayer bridging third conductor 25) 7 slot #4-1 slot #3 → (#4#5 interlayer bridging fourth conductor 26) 43 slot #4-37 slot #5 → (#5#6 interlayer bridging third conductor 25) 31 slot #6-25 slot #5 → (#5#6 interlayer bridging third conductor 25) 19 slot #6-13 slot #5 → (#5#6 interlayer bridging third conductor 25) 7 slot #6-1 slot #5 → (Type I conductor 21) 43 slot #6.

[0102] The connecting part 203 connected to the inner part 201 of the #6 slot layer in slot 1 is formed as the lead part of the U1 branch; the connecting part 203 connected to the inner part 201 of the #6 slot layer in slot 2 is formed as the lead part of the U2 branch; the connecting part 203 connected to the inner part 201 of the #6 slot layer in slot 44 is formed as the neutral point part of the U1 branch; and the connecting part 203 connected to the inner part 201 of the #6 slot layer in slot 43 is formed as the neutral point part of the U2 branch.

[0103] According to the second embodiment of the present invention, the stator assembly 100, such as Figure 2As shown, the difference from the first embodiment is that each stator slot 101 of the stator assembly 100 in the second embodiment has four slot layers, including slot layers #1, #2, #3, and #4 arranged radially from the inside out. The stator winding 20 specifically includes seven conductor wire types, including one type I conductor 21, two types of first conductors 23, two types of second conductors 24, and two types of third conductors 25. The U-shaped conductors 22 are: long-pitch first conductors 23 bridging #1 and #1 in the same layer, short-pitch first conductors 23 bridging #1 and #1 in the same layer, long-pitch second conductors 24 bridging #2 and #3 in layers, short-pitch second conductors 24 bridging #2 and #3 in layers, full-pitch third conductors 25 bridging #1 and #2 in layers, and #3 and #4 in layers. The interlayer bridging third conductor 25. The connection part 203 connected to the inner part 201 of the first slot #4 layer is formed as the lead part of the U1 branch, the connection part 203 connected to the inner part 201 of the second slot #4 layer is formed as the lead part of the U2 branch, the connection part 203 connected to the inner part 201 of the fourth slot #4 layer is formed as the neutral point part of the U1 branch, and the connection part 203 connected to the inner part 201 of the fourth slot #4 layer is formed as the neutral point part of the U2 branch.

[0104] According to the third embodiment of the present invention, the stator assembly 100, such as Figure 3 As shown, the difference from the first embodiment is that each stator slot 101 of the stator assembly 100 in the third embodiment has eight slot layers, including slot layers #1, #2, #3, #4, #5, #6, #7, and #8 arranged radially from the inside out. The stator winding 20 specifically includes 11 conductor wire types, including one type I conductor 21, two types of first conductors 23, two types of second conductors 24, four types of third conductors 25, and two types of fourth conductors 26. The U-shaped conductors 22 are: long-pitch first conductors 23 bridging #1 and #1 in the same layer; short-pitch first conductors 23 bridging #1 and #1 in the same layer; long-pitch second conductors 24 bridging #2 and #3 in layers; short-pitch second conductors 24 bridging #2 and #3 in layers; full-pitch third conductors 25 bridging #1 and #2 in layers; full-pitch third conductors 25 bridging #3 and #4 in layers; and full-pitch third conductors 25 bridging #5 and #6 in layers. The full-spacing third conductor 25 bridging between layers #7 and #8, the full-spacing fourth conductor 26 bridging between layers #4 and #5, and the full-spacing fourth conductor 26 bridging between layers #6 and #7. The connection part 203 connected to the inner part 201 of the #8 slot layer in slot 1 is formed as the lead part of branch U1; the connection part 203 connected to the inner part 201 of the #8 slot layer in slot 2 is formed as the lead part of branch U2; the connection part 203 connected to the inner part 201 of the #8 slot layer in slot 44 is formed as the neutral point part of branch U1; and the connection part 203 connected to the inner part 201 of the #8 slot layer in slot 43 is formed as the neutral point part of branch U2.

[0105] The stator assembly 100 according to an embodiment of the present invention has the following conductor connection path pattern: Figure 4 As shown, depending on the number of slot layers M in the stator slot 101, the number of conductor wire types included in the stator winding 20 can be adaptively varied to M+3 or M+5, while the number, structure, and arrangement of the first conductor 23 and the second conductor 24 remain unchanged. With the number of slot layers remaining constant, the number of conductor wire types included in the stator winding 20 remains constant regardless of the number of slots in the stator slot 101; only the required number of each type of third conductor 25 needs to be adjusted. The small number of conductor wire types required for the entire stator winding 20 helps reduce costs; the wiring method is simple and easy to adjust, and the uniform upward wiring around the stator core helps improve the problem of localized overheating caused by loop currents in the magnetic circuit.

[0106] like Figure 21 As shown, the motor 1000 according to an embodiment of the present invention includes a stator assembly 100 according to an embodiment of the present invention. Since the stator assembly 100 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the motor 1000 according to an embodiment of the present invention improves the loop current problem by winding the stator winding 20 from slot M to slot I and then back to slot M, which is beneficial for the long-term operation of the motor 1000. Furthermore, the conductors of the stator winding 20 are type I conductors 21 and type U conductors 22, and the number of conductor types is M+3 or M+5, which improves the problem of excessive conductor wire types, simplifies the winding process, and helps reduce production costs.

[0107] like Figure 21 As shown, the powertrain 2000 according to an embodiment of the present invention includes a motor 1000 according to an embodiment of the present invention. Since the motor 1000 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the powertrain 2000 according to an embodiment of the present invention improves the loop current problem by winding the stator winding 20 from slot M to slot I and then back to slot M, which is beneficial for the long-term operation of the motor 1000. Furthermore, the conductors of the stator winding 20 are type I conductors 21 and type U conductors 22, and the number of conductor types is M+3 or M+5, which improves the problem of excessive conductor wire types, simplifies the winding process, and helps reduce production costs.

[0108] Here, powertrain 2000 refers to an integrated structure of a series of components on vehicle 3000 used to generate power to drive vehicle 3000. For example, powertrain 2000 may include motor 1000, transmission, and other components integrated into the transmission, such as clutch and differential, so that motor 1000 serves as the main driving force of vehicle 3000; as another example, powertrain 2000 may also include internal combustion engine, so that internal combustion engine and motor 1000 simultaneously serve as the main driving force. Regarding the internal combustion engine and motor 1000 that simultaneously provide driving power mentioned in the above embodiments, the internal combustion engine may use gasoline, diesel, hydrogen, etc. as fuel, and the way to provide electrical energy to motor 1000 may be a power battery, hydrogen fuel cell, etc., without special limitation.

[0109] like Figure 21 As shown, the vehicle 3000 according to an embodiment of the present invention includes a motor 1000 according to an embodiment of the present invention or a powertrain 2000 according to an embodiment of the present invention. Since the motor 1000 or powertrain 2000 according to an embodiment of the present invention has the aforementioned beneficial technical effects, the vehicle 3000 according to an embodiment of the present invention improves the loop current problem by winding the stator winding 20 from slot M to slot I and then back to slot M, which is beneficial for the long-term operation of the motor 1000. Furthermore, the conductors of the stator winding 20 are type I conductors 21 and type U conductors 22, and the number of conductor types is M+3 or M+5, which improves the problem of excessive conductor wire types, simplifies the winding process, and helps reduce production costs.

[0110] Here, vehicle 3000 can be a new energy vehicle. New energy vehicles include pure electric vehicles, range-extended electric vehicles, hybrid electric vehicles, fuel cell electric vehicles, hydrogen engine vehicles, etc. Further, the motor 1000 provided in any of the above designs can serve as the drive motor of vehicle 3000. Specifically, the drive motor can independently start the functional devices of vehicle 3000. Alternatively, the drive motor can cooperate with other drive devices on vehicle 3000 to ensure the normal operation of the functional devices on vehicle 3000. The functional devices of vehicle 3000 can be any or any combination of the following: wheels, air conditioner, lighting components, etc. It should be noted that this is merely an illustrative description of the structure of a new energy vehicle 3000, and is not intended to limit the scope of protection of this invention.

[0111] Other configurations and operations of the motor 1000, powertrain 2000, and vehicle 3000 according to embodiments of the present invention are known to those skilled in the art and will not be described in detail here.

[0112] In the description of this invention, 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 of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0113] In the description of this specification, the references to terms such as "embodiment," "specific embodiment," and "example" indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0114] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A stator assembly, characterized in that, include: A stator core having z stator slots arranged circumferentially along the stator core, each stator slot having 1 to M slot layers arranged radially from the inside out or from the outside in, where M is an even number greater than or equal to 4; A stator winding is mounted on the stator core and includes m-phase windings. Each phase winding includes multiple branches, and each branch includes multiple conductors connected in series. The multiple conductors include two I-type conductors and multiple U-type conductors connected in series between the two I-type conductors. The I-type conductor includes a slot portion and a connecting portion at both ends of the slot portion. The U-type conductor includes two slot portions, a bent portion connecting one end of the two slot portions, and a connecting portion at the other end of the slot portion. The connecting portions of two adjacent conductors in the series path are connected. The branch route winds from the M-slot layer to the 1-slot layer and then winds back to the M-slot layer; wherein... The slot portion of the I-type conductor is located in the M-slot layer; the stator assembly has a corresponding pole number of p; the plurality of U-shaped conductors include a first conductor and a second conductor; the two slot portions of the first conductor are located in the 1-slot layer of different stator slots; the pitches of the first conductors corresponding to the same pole pitch region of multiple branches are different, and the pitches of the first conductors are z / p-1, z / p, or z / p+1; the two slot portions of the second conductor are located in the 2-slot layer and the 3-slot layer of different stator slots, respectively; the pitches of the second conductors in the same branch are different; the pitches of the second conductors corresponding to the same pole pitch region of multiple branches are different, and the pitches of the second conductors are z / p-1, z / p, or z / p+1; the two slot portions of the remaining U-shaped conductors are located in adjacent slot layers of different stator slots, and the pitches of the remaining U-shaped conductors are z / p.

2. The stator assembly according to claim 1, characterized in that, The plurality of U-shaped conductors include n first conductor groups, one second conductor group, one third conductor group, one fourth conductor group, and n first conductor groups connected in series. The first conductor group includes p / 2-1 third conductors and one fourth conductor; the second conductor group includes p / 2-1 of the third conductors and one second conductor; the third conductor group includes p / 2-1 of the third conductors, one first conductor, and p / 2-1 of the third conductors; the fourth conductor group includes one second conductor and p / 2-1 of the third conductors, where n = M / 2-2; wherein, In the first conductor group, the two slot portions of the third conductor are located in the i-th slot layer and the i+1-th slot layer, where i is an odd number greater than 4 and less than M; in the second conductor group, the two slot portions of the third conductor are located in the 3-th slot layer and the 4-th slot layer; in the third conductor group, the two slot portions of the third conductor are located in the 1-th slot layer and the 2-th slot layer; and in the fourth conductor, the two slot portions are located in the i-th slot layer and the i-1-th slot layer. The two connecting portions of the first conductor bend in the same direction, the two connecting portions of the second conductor extend away from each other, the two connecting portions of the third conductor extend away from each other, and the two connecting portions of the fourth conductor extend away from each other.

3. The stator assembly according to claim 1, characterized in that, Each phase winding includes a branches, and the number of conductors in the same slot layer of the a branches is equal. The z / (p×m) stator slots that are adjacent in the axial direction of the stator core constitute a stator slot group for installing the same phase winding, and the number of conductors in the same stator slot group of the a branches is equal.

4. The stator assembly according to claim 1, characterized in that, Each phase winding includes two branches, which are connected in parallel; or, the type I conductor at the end of the series connection of one branch is connected to the type I conductor at the beginning of the series connection of the other branch through the connecting part, thereby connecting the two branches in series.

5. The stator assembly according to claim 1, characterized in that, Each phase winding includes two branches. The pitches of the first conductors of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, respectively. The pitches of the second conductors of the two branches corresponding to the same pole pitch region are z / p-1 and z / p+1, respectively. The pitches of the two second conductors corresponding to the same branch are z / p-1 and z / p+1, respectively.

6. The stator assembly according to claim 1, characterized in that, The slot portion is located within the stator slot, the bent portion of the plurality of U-shaped conductors is located at one axial end of the stator core, the connecting portion of the plurality of U-shaped conductors is located at the other axial end of the stator core, each phase winding includes a parallel branches, in each branch, the connecting portion of two I-shaped conductors that are not connected to the U-shaped conductor is formed as a lead portion and a neutral point portion.

7. The stator assembly according to claim 6, characterized in that, The lead portion of the same phase winding is located in a plurality of consecutive stator slots corresponding to the slot portion, and the neutral point portion of the same phase winding is located in a plurality of consecutive stator slots corresponding to the slot portion; the neutral point portion of the multi-phase winding is connected to the same neutral point connector, and the lead portion of the same phase winding is connected to the same lead connector.

8. The stator assembly according to any one of claims 1-7, characterized in that, The number of slots z in the stator core is 24, 48, or 72.

9. An electric motor, characterized in that, Includes the stator assembly according to any one of claims 1-8.

10. A powertrain, characterized in that, Includes the motor according to claim 9.

11. A vehicle, characterized in that, Includes the motor according to claim 9 or the powertrain according to claim 10.

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