Stator of rectangular wire motor

Abstract

The present application provides a stator for a rectangular wire motor, in which the number of winding slots per pole per phase is three, and the number of layers formed within the slots is 2M. Each phase winding includes two branch paths, each branch path includes a plurality of conductor groups, and each conductor group includes three U-shaped sub-conductors, each of which is inserted into two adjacent layers. The slots occupied by the three sub-conductors of each conductor group on the same circumferential side are referred to as the unit phase first slot, unit phase second slot, and unit phase third slot, respectively. The two legs of the three sub-conductors of each conductor group are inserted into the adjacent layers, in the order of unit phase first slot-unit phase first slot, unit phase second slot-unit phase third slot, unit phase third slot-unit phase second slot, or unit phase first slot-unit phase second slot, unit phase second slot-unit phase first slot, or unit phase third slot-unit phase third slot, respectively. The stator of the rectangular wire motor according to the present invention has a compact structure, low manufacturing costs, and excellent operating performance.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from an invention patent application filed in China on February 9, 2023, entitled "Stator for Flat Wire Motor" and application number "202310084214.0", as well as from an invention patent filed in China on February 15, 2023, entitled "Stator for Flat Wire Motor and Flat Wire Motor" and application number "202310118219.0", and from an invention patent application filed in China on February 17, 2023, entitled "Stator for Flat Wire Motor" and application number "202310128292.6", the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the field of motors, and more particularly to a stator of a rectangular wire motor that uses rectangular wire as a winding. [Background technology]

[0003] Taking the motor of a new energy vehicle as an example, the motor stator using rectangular wire as the winding has a high copper filling rate, which can improve the power density of the motor.

[0004] However, rectangular wire windings have less flexibility in arrangement than round wire windings, and an urgent issue to be solved in this field is how to arrange rectangular wire windings in accordance with the various performance requirements of the motor, simplify the winding structure, reduce manufacturing costs, and provide the motor with excellent operating performance (for example, large torque or small harmonic disturbances).

[0005] In particular, when the number of slots per pole per phase, q, is 3, the number of poles, 2P, is an even multiple of 3, and the flat wire winding has two branches connected in parallel, the winding method in the prior art is complicated. For example, the spacing between the wire leads of each branch in the circumferential direction of the stator is relatively large (the spacing can reach 180°), which makes the arrangement of the busbars complicated, and one end of the winding occupies a large space, which places certain constraints on rotor installation. Summary of the Invention

[0006] In order to solve the above problems, the present application provides a stator for a rectangular wire motor.

[0007] According to one aspect of the present application, there is provided a stator for a rectangular wire motor, the stator including a stator core and a rectangular wire stator winding, The number of winding slots per pole per phase of the stator is 3, the number of stator poles is an even multiple of 3, the number of layers of the rectangular wire stator winding formed in the winding slot is 2M, where M is an integer greater than 1, the rectangular wire stator winding includes three phase windings, each rectangular wire stator winding includes two branch paths, each branch path includes a plurality of conductor groups, and each conductor group includes three U-shaped sub-conductors, two legs of each subconductor are inserted into two adjacent layers, and legs located on the same circumferential side of three subconductors of each conductor group are inserted into three consecutive winding slots; If the slots occupied by the three subconductors of each conductor group on the same circumferential side are respectively designated as the unit phase first slot, the unit phase second slot, and the unit phase third slot, the two leg portions of the three subconductors of each conductor group are inserted into the unit phase first slot-unit phase first slot, the unit phase second slot-unit phase third slot, the unit phase third slot-unit phase second slot, or the unit phase first slot-unit phase second slot, the unit phase second slot-unit phase first slot, or the unit phase third slot-unit phase third slot, of the adjacent layers and phases, respectively; At every pole and every phase, The subconductors completely occupy each layer of three consecutive slots, or The subconductors occupy three consecutive winding slots in the odd layers and three consecutive winding slots in the even layers, and when observed along the axial direction of the stator core, the slots in the odd layers are aligned in the circumferential direction of the stator core and the slots in the even layers are aligned in the circumferential direction, and the winding slots of the subconductors occupying adjacent even and odd layers are offset by one slot in the circumferential direction; or The slots occupied by the subconductors occupy three consecutive inner winding slots in the M layer located radially inward and three consecutive outer winding slots in the M layer located radially outward, and the three inner winding slots and the three outer winding slots are offset by one slot in the circumferential direction.

[0008] In at least one embodiment, the rectangular wire stator winding in each branch is The following conditions are satisfied at the weld end, and a weld pair formed by two adjacent weld legs has only one location located on the same layer and the rest located on adjacent layers: The two weld legs of a weld pair located on adjacent layers belong to the first slot of the unit phase, or belong to the second slot of the unit phase, or belong to the third slot of the unit phase.

[0009] In at least one embodiment, the two weld legs of a weld pair located on the same layer belong to the unit phase first slot-unit phase second slot, respectively, or the unit phase first slot-unit phase third slot, respectively, or the unit phase second slot-unit phase third slot, respectively.

[0010] In at least one embodiment, when the welding positions of welding pairs located on the same layer are defined as nodes and the serial order in which the sub-conductors are welded in the circumferential direction of the stator core is observed, the circumferential routing order of the sub-conductors before and after the node is reversed.

[0011] In at least one embodiment, the spans of the three sub-conductors in each conductor group are 7, 8, and 9, respectively, or 8, 9, and 10, respectively, or 9, 10, and 11, respectively.

[0012] In at least one embodiment, the slots occupied by the subconductors occupy three consecutive inner winding slots in the radially inner M layers and three consecutive outer winding slots in the radially outer M layers, and the three inner winding slots and the three outer winding slots are offset by one slot in the circumferential direction. When M is an odd number, the span of the sub-conductors of the conductor group spanning the Mth layer and the (M+1)th layer is different from the span of the sub-conductors spanning the conductor group of another adjacent layer.

[0013] In at least one embodiment, the span between two weld legs of a welded pair located on the same layer is 8 in one branch and 10 in the other branch; or The span between the two weld legs of a weld pair located on the same layer is 7 in one branch and 11 in the other branch.

[0014] In at least one embodiment, the wire exit end and the lead terminal of each branch path are both located on the same layer.

[0015] In at least one embodiment, the wire outlet end and the lead terminal of each branch path are both located on the innermost layer in the radial direction or on the outermost layer in the radial direction.

[0016] In at least one embodiment, the two branches are connected in series, or the two branches are connected in parallel.

[0017] The stator of the rectangular wire motor according to the present invention has a compact structure, low manufacturing costs, and excellent operating performance. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a schematic diagram of a stator according to a first embodiment of the present invention. [Figure 2] FIG. 1 is a schematic diagram of one possible star connection adopted with a two-branch three-phase winding. [Figure 3]FIG. 1 is a schematic diagram of one possible delta connection employed in a two-branch three-phase winding. [Figure 4] 1 is a schematic diagram of a rectangular wire stator winding according to a first embodiment of the present invention. FIG. [Figure 5] FIG. 2 is a schematic diagram of one phase of a winding according to the first embodiment of the present application. [Figure 6] FIG. 2 is a schematic front view of one sub-conductor according to the first embodiment of the present application. [Figure 7] FIG. 7 is a schematic top view of the sub-conductor in FIG. 6. [Figure 8] 3A and 3B are schematic front and top views of sub-conductors of different spans according to the first embodiment of the present application. [Figure 9] 3A and 3B are schematic front and top views of sub-conductors of different spans according to the first embodiment of the present application. [Figure 10] FIG. 2 is a schematic diagram of a layer of one winding slot of the stator core according to the first embodiment of the present application. [Figure 11] 3 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding of the first embodiment. FIG. [Figure 12] 12 is a schematic diagram of the traveling direction of the welding chain of one of the branch paths corresponding to FIG. 11 . FIG. [Figure 13] 12 is a schematic diagram of the traveling direction of the welding chain of one of the branch paths corresponding to FIG. 11 . FIG. [Figure 14] 12 is a schematic diagram of the running direction of the welding chain of the sub-conductor of another branch path corresponding to FIG. 11. FIG. [Figure 15] FIG. 10 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to a second embodiment. [Figure 16] 16 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 15. FIG. [Figure 17] FIG. 11 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to a third embodiment. [Figure 18] 18 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 17. FIG. [Figure 19] FIG. 10 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to a fourth embodiment. [Figure 20] 20 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 19. FIG. [Figure 21] FIG. 13 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to the fifth embodiment. [Figure 22] 22 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 21. FIG. [Figure 23] FIG. 20 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to a sixth embodiment. [Figure 24] 24 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 23. FIG. [Figure 25] FIG. 20 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to the seventh embodiment. [Figure 26] 26 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 25. FIG. [Figure 27] FIG. 20 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to the eighth embodiment. [Figure 28] 28 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 27. FIG. [Figure 29] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in a winding according to the ninth embodiment. [Figure 30] 30 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 29. FIG. [Figure 31] FIG. 23 is a schematic diagram of the arrangement of sub-conductors of one phase in slots in the winding of the tenth embodiment. [Figure 32] 32 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 31. FIG. [Figure 33] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the eleventh embodiment. [Figure 34]34 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 33. FIG. [Figure 35] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the twelfth embodiment. [Figure 36] 36 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 35. FIG. [Figure 37] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the thirteenth embodiment. [Figure 38] 38 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 37. FIG. [Figure 39] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the fourteenth embodiment. [Figure 40] 39A and 39B are schematic diagrams showing the traveling directions of welding chains for the sub-conductors of the two branch paths. [Figure 41] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding of the fifteenth embodiment. [Figure 42] 42 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 41. FIG. [Figure 43] FIG. 22 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the sixteenth embodiment. [Figure 44] 44 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 43. FIG. [Figure 45] FIG. 23 is a schematic diagram showing the arrangement of sub-conductors of one phase in slots in the winding according to the seventeenth embodiment. [Figure 46] 46 is a schematic diagram of the traveling direction of the welding chain of the sub-conductor of the two branch paths corresponding to FIG. 45. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019]

[0023] Exemplary embodiments of the present application will now be described with reference to the accompanying drawings. It should be understood that these specific descriptions are merely intended to teach those skilled in the art how to implement the present application, and are not intended to list all possible implementations of the present application or to limit the scope of the present application.

[0020] Unless otherwise specified, with reference to FIG. 1, A indicates the axial direction of the stator, R indicates the radial direction of the stator, and C indicates the circumferential direction of the stator.

[0021] The stator according to the present application includes a stator core 10, a rectangular wire stator winding 20 (hereinafter also abbreviated as winding 20), and a wire drawing copper bar 30.

[0022] The inner periphery of the stator core 10 is formed with winding slots (hereinafter also simply referred to as slots) extending along the axial direction A, with the number of slots per pole per phase q being 3, and the number of poles 2P of the stator being an even multiple of 3 (the number of pole pairs P is an integer multiple of 3). In this embodiment, the number of poles 2P=6, and therefore the total number of winding slots is 54. It should be understood that in other possible embodiments, as the number of poles 2P differs, the number of winding slots will also change accordingly.

[0023] As shown in Figures 2 and 3, each phase winding includes two branches connected in parallel. The three-phase windings may be connected in a star configuration, as shown in Figure 2, or in a delta configuration, as shown in Figure 3.

[0024] The windings in the winding slots are distributed in an even number of layers in the radial direction R. The winding leg shown in Figure 4 is formed with six layers. It should be understood that in other possible embodiments the windings may have, for example, four layers, eight layers, etc.

[0025] 5, each phase winding 20 includes a plurality of conductor groups. Each conductor group includes a plurality of sub-conductors 200.

[0026] 6, each sub-conductor 200 is generally U-shaped, with one end in the axial direction A joined to form a crowned end 21 and the other end branching to form a welded end 22. The two leg portions of each sub-conductor 200 extending along the axial direction A are used for insertion into the winding slots.

[0027] FIG. 7 shows a schematic top view of a subconductor 200. Each subconductor 200 spans two layers, meaning that the two legs of each subconductor 200 are located on two adjacent layers. In this embodiment, a single folded portion 21a is formed at the crown-shaped end 21 of the subconductor 200, allowing the two legs of the subconductor 200 to be offset in the radial direction R. By spanning layers, the subconductors 200, especially the subconductors 200 located on the innermost radial layer, do not occupy too much radial space. The windings 20 have a large inner diameter at their ends, making it easier to attach the rotor. FIGS. 8 and 9 show two other subconductors with different spans. It should be understood that the present application does not particularly limit the specific folding structure of the subconductors.

[0028] (First embodiment) Next, a stator according to a first embodiment of the present invention will be introduced, taking as an example a stator in which a four-layer structure is formed in a slot, with reference to Figures 10 to 14. For convenience of explanation, the arrangement method of each sub-conductor 200 will be described in detail using one of the phases, for example, the U phase, as an example.

[0029] In the following description, the different layers within the winding slots will be represented by lowercase letters a, b, c, and d, representing the first, second, third, and fourth layers, respectively, from radially outer to radially inner. It should be understood that the layers within the winding slots are imaginary, and that such layers are formed by stacking legs of multiple subconductors 200; if no subconductors 200 are provided within a slot, then there is no hierarchical structure within the slot.

[0030] Referring to FIG. 11, in this embodiment, the winding 20 of each phase includes 12 conductor groups, and each conductor group includes three sub-conductors 200.

[0031] 5, because the distance between the two legs of each subconductor 200 (hereinafter referred to as the span) is different, the subconductors 200 are divided into a first conductor 201, a second conductor 202, and a third conductor 203. The span is measured based on the difference in slot numbers in the circumferential direction C of the two winding slots into which the two legs of the subconductor 200 are inserted, with the first conductor 201 having the largest span, the second conductor 202 having an intermediate span, and the third conductor 203 having the smallest span.

[0032] In this embodiment, the spans of the first conductor 201, the second conductor 202, and the third conductor 203 are 10, 9, and 8, respectively.

[0033] 11 , the three subconductors of each conductor group are inserted adjacently, i.e., the leg portions of the three subconductors located on the same circumferential side are inserted into three consecutive winding slots. When observed along the circumferential direction C of the stator core 10, the subconductors 200 in each conductor group are arranged such that the second conductor 202, the first conductor 201, and the third conductor 203 are arranged in the order of the winding slots into which the leg portions on one side are inserted.

[0034] Three slots in a layer, in which the three subconductors of each conductor group occupy the same circumferential side, are defined as one group of unit phases. For example, in FIG. 11, slots 4 to 6 on layer d belong to one group of unit phases, and slots 13 to 15 on layer c belong to another group of unit phases. The three slots in one group of unit phases are, in order, the unit phase first slot, the unit phase second slot, and the unit phase third slot. For example, slot 4 on layer d belongs to the unit phase first slot, and slot 13 on layer c also belongs to the unit phase first slot.

[0035] According to the winding scheme of the present application, the two legs of the three subconductors of each conductor group are inserted into the unit phase first slot (first leg of the first subconductor)-unit phase first slot (second leg of the first subconductor) of the adjacent layer, the unit phase second slot (first leg of the second subconductor)-unit phase third slot (second leg of the second subconductor), and the unit phase third slot (first leg of the third subconductor)-unit phase second slot (second leg of the third subconductor), respectively.

[0036] In addition, according to the winding method of the present application, the three subconductors 200 may be arranged in other orders. For example, in the sixth embodiment described below, the two leg portions of the three subconductors of each conductor group are inserted into the unit phase first slot (first leg portion of the first subconductor)-unit phase second slot (second leg portion of the first subconductor) of adjacent layers and adjacent phases, the unit phase second slot (first leg portion of the second subconductor)-unit phase first slot (second leg portion of the second subconductor), and the unit phase third slot (first leg portion of the third subconductor)-unit phase third slot (second leg portion of the third subconductor), respectively.

[0037] When arranged, the conductors distributed in different layers must be aligned circumferentially when viewed along the axial direction A. Alternatively, for each pole and each phase, the subconductors must fully occupy each layer of three consecutive slots. For example, for the one-phase (e.g., U-phase) winding shown in Figure 11, in the first pole, the subconductors completely fill slots 4, 5, and 6; in the second pole, the subconductors completely fill slots 13, 14, and 15; ...; in the sixth pole, the subconductors completely fill slots 49, 50, and 51.

[0038] The position of each slot in each conductor group in each layer can be determined according to the above rules. The specific running direction of each branch path, i.e., the order in which each sub-conductor 200 of each branch path is connected in series, can be achieved by selecting and electrically connecting adjacent legs of appropriate adjacent sub-conductors 200 (for example, in this embodiment, welding two legs at welding ends 22).

[0039] 12 and 13 show the running direction of the weld end of one branch path of the phase, and for clarity, the running direction of the entire weld end of the branch path is shown in two separate figures.

[0040] 11 to 13, the underlined bold numbers indicate the routing order of the first branch paths, and the ununderlined slanted numbers indicate the routing order of the second branch paths. The column and row numbers where each number is located indicate the slot number and layer number where each leg of each sub-conductor is inserted, respectively. For example, numbers 1, 2, 3, and 4 (number x may also be referred to as leg x) are located on the 22-slot a layer, the 13-slot b layer, the 4-slot a layer, and the 49-slot b layer, respectively, and four consecutive legs connected in series are located on the 22-slot a layer, the 13-slot b layer, the 4-slot a layer, and the 49-slot b layer, respectively. The four legs respectively belong to the first leg of the first second conductor 202, the second leg of the first second conductor 202, the first leg of the second second conductor 202, and the second leg of the second second conductor 202. Here, the second leg of the first second conductor 202 and the first leg of the second second conductor 202 are connected by welding at the welding end 22.

[0041] In each branch, the windings satisfy the following conditions at the welded ends: First, in a weld pair formed by two adjacent weld legs, only one is located in the same layer (for example, in Figure 12, the welded legs 12 and 13 are both located in layer d), and the rest are all located in adjacent layers.

[0042] Next, the two weld legs of a weld pair located on the same layer belong to the unit phase 1 slot and the unit phase 2 slot, respectively, or belong to the unit phase 1 slot and the unit phase 3 slot, respectively, or belong to the unit phase 2 slot and the unit phase 3 slot, respectively. For example, in Figure 12, legs 12 and 13 of the first branch belong to the unit phase 1 slot and the unit phase 2 slot, respectively, and also, for example, in Figure 14, legs 24 and 25 of the second branch belong to the unit phase 2 slot and the unit phase 1 slot, respectively. Meanwhile, in a solution introduced in the third embodiment below (see FIG. 18), legs 12 and 13 of the first branch belong to the slots of unit phase 1 and unit phase 3, respectively, and legs 24 and 25 of the second branch belong to the slots of unit phase 3 and unit phase 1, respectively. Also, for example, in the seventh embodiment shown in FIG. 26, legs 24 and 25 of the first branch belong to the slots of unit phase 2 and unit phase 3, respectively, and legs 12 and 13 of the second branch belong to the slots of unit phase 3 and unit phase 2, respectively.

[0043] Finally, the two weld legs of a welded pair located on adjacent layers belong to the slots in unit phase 1, unit phase 2, or unit phase 3. For example, in FIG. 12, all of the legs located on adjacent layers other than legs 12 and 13 located on the same layer belong to the slots in unit phase 1. Also, for example, in the welding chain shown in FIG. 13, the welded legs belong to the slots in unit phase 2 or unit phase 3.

[0044] The serial connection order of adjacent welding legs of adjacent subconductors belonging to the same branch (hereinafter also referred to as welding chains) is shown in two separate diagrams, Figures 12 and 13, to allow readers to more clearly identify the running direction of the welding chain. From leg 2, the welding chain first extends in a first circumferential direction (the direction in which the number of slots in the diagram decreases, defined as the clockwise direction, for example). When it reaches leg 6, it completes one full turn. In this case, the direction of layer crossing must be changed, from layer b to layer a to layer b to layer c. Note that a layer-crossing welding leg typically occurs between layers 2N and 2N-1. After traversing one circumferential turn, a single layer crossing occurs between layers 2N and 2N+1. In Figures 12 and 13, when layer a is the first layer, a layer-crossing weld leg generally occurs between the second and first layers, or between the fourth and third layers, and after traversing one circumferential revolution, a single layer-crossing occurs between the second and third layers.

[0045] The welding chain is routed from the layer located at the end most on one side of the diameter (for example, layer a or layer 1) to the layer located at the end most on the other side of the diameter, and then spirally routed in one direction along the circumferential direction, resulting in a welded pair of the same layer, and then routed in the opposite direction in the circumferential direction at the welded pair location of the same layer. That is, in Figure 12, when the welding chain extends to leg 11 in the clockwise direction, another leg of the sub-conductor to which leg 11 belongs, i.e., leg 12, is connected to leg 13 in the counterclockwise direction.

[0046] 13, all of the welded pairs after the leg portion 13 extend counterclockwise. Therefore, when the welding positions of the welded pairs located on the same layer are defined as nodes and the welding order of the sub-conductors 200 is viewed from the perspective of the serial connection order of welding in the circumferential direction, it can be seen that the routing order of the sub-conductors 200 before and after the node in the circumferential direction is reversed.

[0047] 14 shows the serial connection order of welding pairs in another branch path of this embodiment. The welding pairs in the same layer in this branch path are leg 24 and leg 25, which belong to the second slot of unit phase and the first slot of unit phase, respectively.

[0048] Since the legs of the welded pairs of the same layer and the welded pairs of different layers select different unit phase slots, the spans of the welded pairs of the same layer and the welded pairs of different layers are also different. The spans of all the welded pairs of different layers are the same, which is 9 in this embodiment. In this embodiment, the span of the welded pairs of the same layer of the first branch path is 10, and the span of the welded pairs of the same layer of the second branch path is 8.

[0049] Next, the running directions of the windings of the two branch paths in this embodiment will be described in detail. The placement of the two legs of each subconductor 200 in different slots and on different layers is indicated by the following symbols: First conductor 201: {*a-*b} Second conductor 202: [*a-*b] Third conductor 203: (*a-*b) Here, * represents the slot number, and a / b represents the layer number within the slot.

[0050] For example, {6a-50b} indicates that the two legs of the first conductor 201 (with a span of 10) are inserted into the a layer of the 6th slot and the b layer of the 50th slot, respectively; [22a-13b] indicates that the two legs of the second conductor 202 (with a span of 9) are inserted into the a layer of the 22nd slot and the b layer of the 13th slot, respectively; and (40d-48c) indicates that the two legs of the third conductor 203 (with a span of 8) are inserted into the d layer of the 40th slot and the c layer of the 48th slot, respectively.

[0051] In this embodiment, the a-th layer of the 22nd slot is the wire lead-out end of the first branch path, and this is introduced as the starting point. First fork in the road Wire pull-out end-[22a-13b]-[4a-49b]-[40a-31b]- [22c-13d]-[4c-49d]-[40c-31d]~ {41d-51c}-(6d-14c)-{23d-33c}-(42d-50c)-{5d-15c}-(24d-32c)- {41b-51a}-(6b-14a)-{23b-33a}-(42b-50a)-{5b-15a}-(24b-32a)-Lead terminal It should be understood that in the above description, the sub-conductors 200 are shown in rows in order to allow the reader to easily observe the placement positions of the sub-conductors 200 between different adjacent layers and to observe the different arrangements before and after the welding pairs (represented by ~) of the same layer, but in reality, the sub-conductors 200 located in different rows are still connected in series. The second fork Wire pull-out end - (23a-15b) - {6a-50b} - (41a-33b) - {24a-14b} - (5a-51b) - {42a-32b} - (23c-15d)-{6c-50d}-(41c-33d)-{24c-14d}-(5c-51d)-{42c-32d}~ [40d-49c]-[4d-13c]-[22d-31c]- [40b-49a]-[4b-13a]-[22b-31a]-Lead terminal

[0052] 11, according to this routing method, the wire ends of the two branch paths are located in adjacent slots, and similarly, the lead terminals of the two branch paths are located in adjacent slots, and the wire ends and lead terminals of the two branch paths are located at adjacent poles. In this way, the ends of all the branch paths are located within a very small range in the circumferential direction C, which makes the structure of the wire copper bar very compact and saves material.

[0053] (Second embodiment) A second embodiment of the present invention will be introduced with reference to Figures 15 and 16. Since the second embodiment is a modification of the first embodiment, the same reference numerals are used to designate components that are the same as or similar in structure or function to those in the first embodiment, and detailed descriptions of these components will be omitted. The main difference between this embodiment and the first embodiment is the number of layers in the winding slot, which is six in this embodiment. The other routing rules are the same as in the first embodiment, so the routing order of the two branch paths will be described briefly. First fork in the road Terminal-[22a-13b]-[4a-49b]-[40a-31b]- [22c-13d]-[4c-49d]-[40c-31d]- [22e-13f]-[4e-49f]-[40e-31f]~ {41f-51e}-(6f-14e)-{23f-33e}-(42f-50e)-{5f-15e}-(24f-32e)- {41d-51c}-(6d-14c)-{23d-33c}-(42d-50c)-{5d-15c}-(24d-32c)- {41b-51a}-(6b-14a)-{23b-33a}-(42b-50a)-{5b-15a}-(24b-32a)-Lead terminal The second fork Terminal-(23a-15b)-{6a-50b}-(41a-33b)-{24a-14b}-(5a-51b)-{42a-32b}- (23c-15d)-{6c-50d}-(41c-33d)-{24c-14d}-(5c-51d)-{42c-32d}- (23e-15f)-{6e-50f}-(41e-33f)-{24e-14f}-(5e-51f)-{42e-32f}~ [40f-49e]-[4f-13e]-[22f-31e]- [40d-49c]-[4d-13c]-[22d-31c]- [40b-49a]-[4b-13a]-[22b-31a]-Lead terminal

[0054] (Third embodiment) A third embodiment of the present invention will be described with reference to Figures 17 and 18. The third embodiment is a modification of the first embodiment, and the main difference between the first and second embodiments is that in this embodiment, the two weld legs of a welded pair located on the same layer belong to the first slot of the unit phase and the third slot of the unit phase, respectively. Depending on the connection method, the span of the welded pair on the same layer is 11 or 7. First fork in the road Wire pull-out end-[22a-13b]-[4a-49b]-[40a-31b]- [22c-13d]-[4c-49d]-[40c-31d]~ (42d-50c)-{5d-15c}-(24d-32c)-{41d-51c}-(6d-14c)-{23d-33c}- (42b-50a)-{5b-15a}-(24b-32a)-{41b-51a}-(6b-14a)-{23b-33a}-Lead terminal The second fork Wire pull-out end-{24a-14b}-(5a-51b)-{42a-32b}-(23a-15b)-{6a-50b}-(41a-33b)- {24c-14d}-(5c-51d)-{42c-32d}-(23c-15d)-{6c-50d}-(41c-33d)~ [40d-49c]-[4d-13c]-[22d-31c]- [40b-49a]-[4b-13a]-[22b-31a]-Lead terminal According to this routing method, the wire lead-out ends of the two branch paths are spaced apart by one winding slot, and similarly, the lead terminals of the two branch paths are spaced apart by one winding slot, but the wire lead-out ends of the two branch paths and the lead terminals are still located at adjacent poles, so the arrangement of the wire lead-out copper bar is still compact and saves material.

[0055] (Fourth embodiment) A fourth embodiment of the present invention will be introduced with reference to Figures 19 and 20. The fourth embodiment is a modification of the first embodiment, and the main differences between this embodiment and the first embodiment are as follows.

[0056] First, the subconductors 200 occupy three consecutive slots in the odd-numbered layers of each pole and three consecutive slots in the even-numbered layers. When observed along the axial direction A of the stator core 10, the slots of the odd-numbered layers of the subconductors 200 for the same pole of the same phase are aligned in the circumferential direction C, and the slots of the even-numbered layers of the same pole of the same phase are aligned in the circumferential direction C, and the slots of adjacent even and odd layers are offset by one slot in the circumferential direction C. For example, the slots occupied by the first pole of the U phase shown in FIG. 19 in the odd-numbered layers (layers a and c) are slot 4, slot 5, and slot 6, and the slots occupied by the even-numbered layers (layers b and d) are slot 3, slot 4, and slot 5.

[0057] For each pole and phase, the slots between adjacent layers are offset in the circumferential direction C, which reduces winding harmonics and reduces NVH during motor operation.

[0058] Next, in this embodiment, the spans of the first conductor 201, the second conductor 202, and the third conductor 203 are 11, 10, and 9, respectively, and the spans between adjacent leg portions of adjacent conductors (i.e., the spans of welded pairs) are all 8 except for the spans of welded pairs on the same layer, which are 10 or 8. Regarding the specific winding direction, the first branch Terminal-[22a-12b]-[4a-48b]-[40a-30b]- [22c-12d]-[4c-48d]-[40c-30d]~ {40d-51c}-(5d-14c)-{22d-33c}-(41d-50c)-{4d-15c}-(23d-32c)- {40b-51a}-(5b-14a)-{22b-33a}-(41b-50a)-{4b-15a}-(23b-32a)-Lead terminal The second fork Terminal-(23a-14b)-{6a-49b}-(41a-32b)-{24a-13b}-{5a-50b}-(42a-31b)- (23c-14d)-{6c-49d}-(41c-32d)-{24c-13d}-{5c-50d}-(42c-31d)~ [39d-49c]-[3d-13c]-[21d-31c]- [39b-49a]-[3b-13a]-[21b-31a]-Lead terminal

[0059] (Fifth embodiment) A fifth embodiment of the present invention will be introduced with reference to Figures 21 and 22. The fifth embodiment is a modification of the first and fourth embodiments.

[0060] The main difference between this embodiment and the first embodiment is as follows: In this embodiment, the spans of the first conductor 201, the second conductor 202, and the third conductor 203 are 9, 8, and 7, respectively, and the spans between adjacent legs of adjacent conductors are all 10 except for the spans of welded pairs in the same layer, which are 10 or 8.

[0061] The present embodiment is opposite to the fourth embodiment in terms of the misalignment direction between the odd-numbered layers and the even-numbered layers. Regarding the specific winding direction, the first branch Terminal-[22a-14b]-[4a-50b]-[40a-32b]- [22c-14d]-[4c-50d]-[40c-32d]~ {42d-51c}-(7d-14c)-{24d-33c}-(43d-50c)-{6d-15c}-(25d-32c)- {42b-51a}-(7b-14a)-{24b-33a}-(43b-50a)-{6b-15a}-(25b-32a)-Lead terminal The second fork Terminal-(23a-16b)-{6a-51b}-(41a-34b)-{24a-15b}-(5a-52b)-{42a-33b}- (23c-16d)-{6c-51d}-(41c-34d)-{24c-15d}-(5c-52d)-{42c-33d}~ [41d-49c]-[5d-13c]-[23d-31c]- [41b-49a]-[5b-13a]-[23b-31a]-Lead terminal

[0062] (Sixth embodiment) A sixth embodiment of the present invention will be introduced with reference to Figures 23 and 24. The sixth embodiment is a modification of the first embodiment.

[0063] As described above, the main difference between this embodiment and the first embodiment is as follows: The two legs of the three sub-conductors in each conductor group are inserted into the unit phase first slot-unit phase second slot, the unit phase second slot-unit phase first slot, and the unit phase third slot-unit phase third slot of the adjacent layers and phases, respectively. In this embodiment, when observed along the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged such that the first conductor 201, the third conductor 203, and the second conductor 202 are inserted in the order of the winding slots.

[0064] The span between adjacent legs of adjacent conductors is changed at the same layer weld pair locations by changing the arrangement order of each sub-conductor 200. In this embodiment, the span between the same layer weld pairs is 11 or 7. Regarding the specific winding direction, the first branch Terminal-(22a-14b)-{5a-49b}-(40a-32b)-{23a-13b}-(4a-50b)-{41a-31b}- (22c-14d)-{5c-49d}-(40c-32d)-{23c-13d}-(4c-50d)-{41c-31d}~ [42d-51c]-[6d-15c]-[24d-33c]- [42b-51a]-[6b-15a]-[24b-33a]-Lead terminal The second fork Terminal-[24a-15b]-[6a-51b]-[42a-33b]- [24c-15d]-[6c-51d]-[42c-33d]- {40d-50c}-(5d-13c)-{22d-32c}-(41d-49c)-{4d-14c}-(23d-31c)- {40b-50a}-(5b-13a)-{22b-32a}-(41b-49a)-{4b-14a}-(23b-31a)-Lead terminal

[0065] (Seventh embodiment) A seventh embodiment of the present invention will be introduced with reference to Figures 25 and 26. The seventh embodiment is a modification of the first, third and sixth embodiments.

[0066] The main differences between this embodiment and the first embodiment are as follows.

[0067] First, for each branch path of each phase, the two weld legs of a weld pair in the same layer belong to the second slot of the unit phase and the third slot of the unit phase, respectively.

[0068] Next, the two legs of the three sub-conductors in each conductor group are inserted into the unit phase first slot-unit phase second slot, unit phase second slot-unit phase first slot, and unit phase third slot-unit phase third slot of the adjacent layer and adjacent phase, respectively. When observed along the circumferential direction C of the stator core 10, the sub-conductors 200 in each conductor group are arranged with the first conductor 201, third conductor 203, and second conductor 202 in accordance with the order of the winding slots into which they are inserted.

[0069] By changing the above two rules simultaneously, in accordance with the connection order, in this embodiment, the spans between the welding pairs in the same layer of the two branch paths are 10 and 8 (the same as in the first embodiment), respectively. The spans of the welding pairs in other positions are all 9 (the same as in the first embodiment). Specifically, the routing order of the two branch paths is as follows: First fork in the road Wire pull-out end-{23a-13b}-(4a-50b)-{41a-31b}-(22a-14b)-{5a-49b}-(40a-32b)- {23c-13d}-(4c-50d)-{41c-31d}-(22c-14d)-{5c-49d}-(40c-32d)~ [42a-51b]-[6a-15b]-[24a-33b]- [42c-51d]-[6c-15d]-[24c-33d]-Lead terminal The second fork Wire pull-out end-[24a-15b]-[6a-51b]-[42a-33b]- [24c-15d]-[6c-51d]-[42c-33d]~ (41d-49c)-{4d-14c}-(23d-31c)-{40d-50c}-(5d-13c)-{22d-32c}- (41b-49a)-{4b-14a}-(23b-31a)-{40b-50a}-(5b-13a)-{22b-32a}-Lead terminal

[0070] (Eighth embodiment) An eighth embodiment of the present invention will be introduced with reference to Figures 27 and 28. The eighth embodiment is a modification of the first embodiment, and the main differences between this embodiment and the first embodiment are as follows:

[0071] First, when the total number of layers is 2M (in the present embodiment, M=2, 2M=4), the slots occupied by the subconductors 200 occupy three consecutive inner winding slots in the M radially inner layers, and three consecutive outer winding slots in the M radially outer layers, with the three inner winding slots and the three outer winding slots being offset by one slot in the circumferential direction. Note that in the eighth to twelfth embodiments, M, which is half the number of layers, is an even number.

[0072] Next, for a welding pair spanning the Mth layer and the (M+1)th layer (for example, in this embodiment, a welding pair spanning the 2nd and 3rd layers, i.e., layers b and c), its span is different from the span of welding pairs of other different layers. It should be understood that the welding pair spanning the Mth layer and the (M+1)th layer still adopts a routing method in which "two weld legs of a welding pair located on adjacent layers belong to a unit phase first slot, a unit phase second slot, or a unit phase third slot," because the unit phase slots of the Mth layer and the (M+1)th layer are shifted in the circumferential direction. Specifically, the running directions of the sub-conductors 200 of the first branch path are as follows. Wire pull-out end-[21a-12b]-[3a-48b]-[39a-30b]= [22c-13d]-[4c-49d]-[40c-31d]~ {41d-51c}-(6d-14c)-{23d-33c}-(42d-50c)-{5d-15c}-(24d-32c)= {40b-50a}-(5b-13a)-{22b-32a}-(41b-49a)-{4b-14a}-(23b-31a)-Lead terminal In the above array, "=" represents a weld pair spanning the Mth layer and the M+1th layer. The second fork Wire pull-out end - (22a-14b) - {5a-49b} - (40a-32b) - {23a-13b} - (4a-50b) - {41a-31b} = (23c-15d)-{6c-50d}-(41c-33d)-{24c-14d}-(5c-51d)-{42c-32d}~ [40d-49c]-[4d-13c]-[22d-31c]= [39b-48a]-[3b-12a]-[21b-30a]-Lead terminal

[0073] (Ninth embodiment) A ninth embodiment of the present invention will be introduced with reference to Figures 29 and 30. The ninth embodiment is a modification of the eighth embodiment, and the main difference between this embodiment and the eighth embodiment is that the slot offset direction is different when layers b and c are misaligned. This distinction results in a different span for the welding pair spanning layers M and M+1. Of course, the welding pair spanning layers M and M+1 still employs a routing method in which the two weld legs of the welding pair located on adjacent layers belong to either the first slot in the unit phase, the second slot in the unit phase, or the third slot in the unit phase. Specifically, in this embodiment, the first branch path Wire pull-out end-[22a-13b]-[4a-49b]-[40a-31b]= [21c-12d]-[3c-48d]-[39c-30d]~ {40d-50c}-(5d-13c)-{22d-32c}-(41d-49c)-{4d-14c}-(23d-31c)= {41b-51a}-(6b-14a)-{23b-33a}-(42b-50a)-{5b-15a}-(24b-32a)-Lead terminal The second fork Wire pull-out end - (23a-15b) - {6a-50b} - (41a-33b) - {24a-14b} - (5a-51b) - {42a-32b} = (22c-14d)-{5c-49d}-(40c-32d)-{23c-13d}-(4c-50d)-{41c-31d}~ [39d-48c]-[3d-12c]-[21d-30c]= [40b-49a]-[4b-13a]-[22b-31a]-Lead terminal

[0074] (Tenth embodiment) A tenth embodiment of the present invention will be introduced with reference to Figures 31 and 32. The tenth embodiment is a modification of the eighth embodiment, and the main differences between this embodiment and the eighth embodiment (same as the third embodiment) are as follows: the two weld legs of a welded pair located on the same layer belong to the first slot of the unit phase and the third slot of the unit phase, respectively. Depending on this connection method, the span of the welded pair on the same layer is 11 or 7. Specifically, the routing order of the two branch paths is as follows: First fork in the road Wire pull-out end-[21a-12b]-[3a-48b]-[39a-30b]= [22c-13d]-[4c-49d]-[40c-31d]~ (42d-50c)-{5d-15c}-(24d-32c)-{41d-51c}-(6d-14c)-{23d-33c}= (41b-49a)-{4b-14a}-(23b-31a)-{40b-50a}-(5b-13a)-{22b-32a}-Lead terminal The second fork Wire pull-out end -{23a-13b}-(4a-50b)-{41a-31b}-(22a-14b)-{5a-49b}-(40a-32b)= {24c-14d}-(5c-51d)-{42c-32d}-(23c-15d)-{6c-50d}-(41c-33d)~ [40d-49c]-[4d-13c]-[22d-31c]= [39b-48a]-[3b-12a]-[21b-30a]-Lead terminal

[0075] (Eleventh embodiment) An eleventh embodiment of the present invention will be introduced with reference to FIGS. 33 and 34. The eleventh embodiment is a modification of the eighth embodiment. Similar to the sixth embodiment, in this embodiment, the two legs of the three subconductors of each conductor group are inserted into the unit phase first slot-unit phase second slot, unit phase second slot-unit phase first slot, and unit phase third slot-unit phase third slot of adjacent layers, respectively. In this embodiment, when observed along the circumferential direction C of the theta core 10, the subconductors 200 in each conductor group are arranged in the order of the first conductor 201, the third conductor 203, and the second conductor 202 according to the order of the winding slots into which they are inserted. By changing the arrangement order of the subconductors 200, the span between adjacent legs of adjacent conductors changes in welded pairs in the same layer. In this embodiment, the span of welded pairs in the same layer is 11 or 7. Specifically, the routing order of the two branch paths is as follows: First fork in the road Wire pull-out end - (21a-13b) - {4a-48b} - (39a-31b) - {22a-12b} - (3a-49b) - {40a-30b} = (22c-14d)-{5c-49d}-(40c-32d)-{23c-13d}-(4c-50d)-{41c-31d}~ [42d-51c]-[6d-15c]-[24d-33c]= [41d-50c]-[5d-14c]-[23d-32c]-Lead terminal The second fork Wire pull-out end-[23a-14b]-[5a-50b]-[41a-32b]= [24c-15d]-[6c-51d]-[42c-33d]~ {40d-50c}-(5d-13c)-{22d-32c}-(41d-49c)-{4d-14c}-(23d-31c)= {39b-49a}-(4b-12a)-{21b-31a}-(40b-48a)-{3b-13a}-(22b-30a)-Lead terminal

[0076] (Twelfth embodiment) A twelfth embodiment of the present application will be introduced with reference to Figures 35 and 36. The twelfth embodiment is a modification of the eighth embodiment, and this embodiment combines the modified features of the tenth and eleventh embodiments. The two weld legs of a weld pair located on the same layer belong to the unit phase second slot and the unit phase third slot, respectively, while the two legs of the three sub-conductors of each conductor group are inserted into the unit phase first slot and the unit phase second slot, the unit phase second slot and the unit phase first slot, and the unit phase third slot and the unit phase third slot of the adjacent layer, respectively. Specifically, the routing order of the two branch paths is as follows. First fork in the road Wire pull-out end -{22a-12b}-(3a-49b)-{40a-30b}-(21a-13b)-{4a-48b}-(39a-31b)= {23c-13d}-(4c-50d)-{41c-31d}-(22c-14d)-{5c-49d}-(40c-32d)~ [42d-51c]-[6d-15c]-[24d-33c]= [41b-50a]-[5b-14a]-[23b-32a]-Lead terminal The second fork Wire pull-out end-[23a-14b]-[5a-50b]-[41a-32b]= [24c-15d]-[6c-51d]-[42c-33d]~ (41d-49c)-{4d-14c}-(23d-31c)-{40d-50c}-(5d-13c)-{22d-32c}= (40b-48a)-{3b-13a}-(22b-30a)-{39b-49a}-(4b-12a)-{21b-31a}-Lead terminal

[0077] (Thirteenth embodiment) A thirteenth embodiment of the present invention will be introduced with reference to Figures 37 and 38. The thirteenth embodiment is a modification of the eighth embodiment, and is distinguished from the eighth embodiment in that the number of layers is half that of the eighth embodiment, i.e., M is an odd number (in this embodiment, M=3).

[0078] In the eighth to twelfth embodiments, since M is an even number, there is no situation in which the two legs of a U-shaped sub-conductor belong to the Mth layer and the (M+1)th layer, respectively, and misalignment between the Mth layer and the (M+1)th layer does not affect the span of a single U-shaped sub-conductor. However, in this embodiment, there is a situation in which the two legs of a single U-shaped sub-conductor straddle the Mth layer and the (M+1)th layer, and due to the misalignment between these two layers in the circumferential direction, the span of this U-shaped sub-conductor differs from the span of U-shaped sub-conductors located on other layers.

[0079] In this embodiment, two types of conductor groups are included, and the spans of the three subconductors of the conductor group spanning the Mth layer and the (M+1)th layer are 9, 8, and 7, respectively, while the spans of the three subconductors of the conductor group spanning other adjacent layers are 10, 9, and 8, respectively. Note that these subconductors still follow the rule that the two leg portions of the three subconductors of each conductor group are inserted into adjacent layers, adjacent phases, unit phase first slot-unit phase first slot, unit phase second slot-unit phase third slot, and unit phase third slot-unit phase second slot, respectively.

[0080] <*a-*b> represents the subconductor with the smallest span (7 in this embodiment), (*a-*b) represents the subconductor with the second largest span (8 in this embodiment), [*a-*b] represents the subconductor with the third largest span (9 in this embodiment), and {*a-*b} represents the subconductor with the fourth largest span (10 in this embodiment). Specifically, the running directions of the sub-conductors of the first branch path are as follows: Wire pull-out end-[21a-12b]-[3a-48b]-[39a-30b]- (21c-13d)=(3c-49d)=(39c-31d)- [22e-13f]-[4e-49f]-[40e-31f]~ {41f-51e}-(6f-14e)-{23f-33e}-(42f-50e)-{5f-15e}-(24f-32e)- [41d-50c]=<6d-13c>=[23d-32c]=<42d-49c>=[5d-14c]=<24d-31c>- {40b-50a}-(5b-13a)-{22b-32a}-(41b-49a)-{4b-14a}-(23b-31a)-Lead terminal The second fork Wire pull-out end - (22a-14b) - {5a-49b} - (40a-32b) - {23a-13b} - (4a-50b) - {41a-31b} - <22c-15d>=[5c-50d]=<40c-33d>=[23c-14d]=<4c-51d>=[41c-32d]- (23e-15f)-{6e-50f}-(41e-33f)-{24e-14f}-(5e-51f)-{42e-32f}~ [40f-49e]-[4f-13e]-[22f-31e]- (40d-48c)-(4d-12c)-(22d-30c)- [39b-48a]-[3b-12a]-[21b-30a]-Lead terminal

[0081] (Fourteenth embodiment) 39 and 40, a fourteenth embodiment of the present invention will be introduced. The fourteenth embodiment is a modification of the thirteenth embodiment, and the main differences between this embodiment and the thirteenth embodiment are as follows: When the Mth layer and the (M+1)th layer are misaligned, the offset direction of the slots is different, and as a result, the spans of the three sub-conductors of the conductor group spanning the Mth layer and the (M+1)th layer are different, and in this embodiment, they are 11, 10, and 9. Hereinafter, *a-*b represents a sub-conductor with a span of 11. The specific branch routing method is as follows: First fork in the road Wire pull-out end-[22a-13b]-[4a-49b]-[40a-31b]- {22c-12d}={4c-48d}-{40c-30d}- [21e-12f]-[3e-48f]-[39e-30f]~ {40f-50e}-(5f-13e)-{22f-32e}-(41f-49e)-{4f-14e}-(23f-31e)- 《40d-51c》=[5d-14c]=《22d-33c》=[41d-50c]=《4d-15c》=[23d-32c]- {41b-51a}-(6b-14a)-{23b-33a}-(42b-50a)-{5b-15a}-(24b-32a)-Lead terminal The second fork Wire pull-out end - (23a-15b) - {6a-50b} - (41a-33b) - {24a-14b} - (5a-51b) - {42a-32b} - [23c-14d]=《6c-49d》=[41c-32d]=《24c-13d》=[5c-50d]=《42c-31d》- (22e-14f)-{5e-49f}-(40e-32f)-{23e-13f}-(4e-50f)-{41e-31f}~ [39f-48e]-[3f-12e]-[21f-30e]- {39d-49c}={3d-13c}={21d-31c}- [40b-49a]-[4b-13a]-[22b-31a]-Lead terminal

[0082] (Fifteenth embodiment) A fifteenth embodiment of the present invention will be introduced with reference to Figures 41 and 42. The fifteenth embodiment is a modification of the thirteenth embodiment, and the main difference between this embodiment and the thirteenth embodiment is as follows: the two weld legs of a weld pair located in the same layer belong to the first slot of the unit phase and the third slot of the unit phase, respectively. According to this connection order, in this embodiment, the span of the weld pair in the same layer of one branch path is 11, and the span of the weld pair in the same layer of the other branch path is 7. The specific routing order of the two branch paths is as follows: First fork in the road Wire pull-out end-[21a-12b]-[3a-48b]-[39a-30b]- (21c-13d)=(3c-49d)=(39c-31d)- [22e-13f]-[4e-49f]-[40e-31f]~ (42f-50e)-{5f-15e}-(24f-32e)-{41f-51e}-(6f-14e)-{23f-33e}- <42d-49c>=[5d-14c]=<24d-31c>=[41d-50c]=<6d-13c>=[23d-32c]- (41b-49a)-{4b-14a}-(23b-31a)-{40b-50a}-(5b-13a)-{22b-32a}-Lead terminal The second fork Wire pull-out end-{23a-13b}-(4a-50b)-{41a-31b}-(22a-14b)-{5a-49b}-(40a-32b)- [23c-14d]=<4c-51d>=[41c-32d]=<22c-15d>=[5c-50d]=<40c-33d>- {24e-14f}-(5e-51f)-{42e-32f}-(23e-15f)-{6c-50f}-(41c-33f)~ [40f-49e]-[4f-13e]-[22f-31e]- (40d-48c)=(4d-12c)=(22d-30c)- [39b-48a]-[3b-12a]-[21b-30a]-Lead terminal

[0083] (16th embodiment) The sixteenth embodiment of the present invention will be introduced with reference to Figures 43 and 44. The sixteenth embodiment is a modification of the thirteenth embodiment, and the main differences between this embodiment and the thirteenth embodiment are as follows:

[0084] First, in this embodiment, the two leg portions of the three sub-conductors of each conductor group are inserted into the unit phase first slot-unit phase second slot, unit phase second slot-unit phase first slot, and unit phase third slot-unit phase third slot of adjacent layers and adjacent phases, respectively.

[0085] Next, similarly to the fifteenth embodiment, the two weld legs of a weld pair located on the same layer belong to the first slot of the unit phase and the third slot of the unit phase, respectively. The specific routing order of the two branch paths is as follows: First fork in the road Wire pull-out end - (21a-13b) - {4a-48b} - (39a-31b) - {22a-12b} - (3a-49b) - {40a-30b} - <21c-14d>=[4c-49d]=<39c-32d>=[22c-13d]=<3c-50d>=[40c-31d]- (22e-14f)-{5e-49f}-(40e-32f)-{23e-13f}-(4e-50f)-{41e-31f}~ [42f-51e]-[6f-15e]-[24f-33e]- (42d-50c)=(6d-14c)=(24d-32c)- [41b-50a]-[5b-14a]-[24b-32a]-Lead terminal The second fork Wire pull-out end-[23a-14b]-[5a-50b]-[41a-32b]- (23c-15d)=(5c-51d)=(41c-33d)- [24e-15f]-[6e-51f]-[42e-33f]~ {40f-50e}-(5f-13e)-{22f-32e}-(41f-49e)-{4f-14e}-(23f-31e)- [40d-49c]=<5d-12c>=[22d-31c]=<41d-48c>=[4d-13c]=<23d-30c>- {39b-49a}-(4b-12a)-{21b-31a}-(40b-48a)-{3b-13a}-(22b-30a)-Lead terminal

[0086] (17th embodiment) 45 and 46, a seventeenth embodiment of the present invention will be introduced. The seventeenth embodiment is a modification of the sixteenth embodiment, and the main differences between this embodiment and the sixteenth embodiment are as follows: the two weld legs of a weld pair located on the same layer belong to the first slot of the unit phase and the second slot of the unit phase, respectively. The specific routing order of the two branch paths is as follows: First fork in the road Wire pull-out end-{22a-12b}-(3a-49b)-{40a-30b}-(21a-13b)-{4a-48b}-(39a-31b)- [22c-13d]=<3c-50d>=[40c-31d]=<21c-14d>=[4c-49d]=<39c-32d>- {23e-13f}-(4e-50f)-{41e-31f}-(22e-14f)-{5e-49f}-(40e-32f)~ [42f-51e]-[6f-15e]-[24f-33e]- (42d-50c)=(6d-14c)=(24d-32c)- [41b-50a]-[5b-14a]-[23b-32a]-Lead terminal The second fork Wire pull-out end-[23a-14b]-[5a-50b]-[41a-32b]- (23c-15d)=(5c-51d)=(41c-33d)- [24e-15f]-[6e-51f]-[42e-33f]~ (41f-49e)-{4f-14e}-(23f-31e)-{40f-50e}-(5f-13e)-{22f-32e}- <41d-48c>=[4d-13c]=<23d-30c>=[40d-49c]=<5d-12c>=[22d-31c]- (40b-48a)-{3b-13a}-(22b-30a)-{39b-49a}-(4b-12a)-{21b-31a}-Lead terminal It should be understood that the above embodiments and part of the contents or features thereof may be combined as appropriate.

[0087] The present application has at least one of the following advantages:

[0088] (i) Because each sub-conductor 200 spans two layers, the sub-conductors 200, especially the radially innermost sub-conductors 200, do not take up much radial space, and the windings 20 have a large inner diameter at the ends, making it easy to attach the rotor.

[0089] (ii) The distance in the circumferential direction C between the wire pull-out ends of the windings of the two branch paths of each phase and the lead terminals is small, which makes the structure compact and simple, and the winding space of the branch paths symmetrical, so that no loop current is generated.

[0090] (iii) This application provides various embodiments for production applications, and as needed, a large torque can be obtained by selecting an aligned routing pattern for each layer of the conductors per pole and per phase in the circumferential direction of the slot. A small harmonic effect can also be obtained by selecting an offset routing pattern for each layer of the conductors per pole and per phase in the circumferential direction of the slot. Alternatively, the harmonic effect and noise can be reduced by selecting an offset routing pattern for each layer of the conductors per pole and per phase in the circumferential direction of the slot between the inner M layers and the outer M layers.

[0091] The above are merely examples of the present application, and the scope of protection of the present application is not limited to these specific examples, but is determined by the scope of the claims of the present application. Those skilled in the art will appreciate that the present application may have various modifications and variations. All modifications, substitutions, improvements, etc. made within the technical ideas and principles of the present application shall be included in the scope of protection of the present application. For example, (i) In the above embodiments, the wire lead-out ends and lead terminals may be interchanged. (ii) In the above embodiments, the wire lead ends and lead terminals are arranged on the outermost radial layer, and the twist nodes are arranged on the innermost radial layer, but this is not essential. For example, the wire lead ends and lead terminals may be located on the innermost radial layer, and the twist nodes may be located on the outermost radial layer. (iii) The entire slot numbers selected for each pole and each phase in the above embodiment may be translated in the circumferential direction C. (iv) Regarding the connection of welded pairs in the same layer, in addition to folding back the welded end of the sub-conductor in Figures 6 to 9 to change the span between the leg portions of the adjacent sub-conductor, other means (also called bus bars) may be used to electrically connect to the leg portions of the adjacent sub-conductor.

Claims

1. A stator for a rectangular wire motor including a stator core (10) and a rectangular wire stator winding (20), The number of winding slots per pole per phase of the stator is 3, the number of poles (2P) of the stator is an even multiple of 3, the number of layers of the rectangular wire stator winding (20) formed in the winding slots is 2M, where M is an integer greater than 1, the rectangular wire stator winding (20) includes a three-phase winding, the rectangular wire stator winding (20) of each phase includes two branch paths, each branch path includes a plurality of conductor groups, and each conductor group includes three U-shaped sub-conductors (200), The two legs of each of the sub-conductors (200) are inserted into two adjacent layers, and the legs located on the same circumferential side of the three sub-conductors (200) of each of the conductor groups are inserted into three consecutive winding slots; If the slots occupied by the three sub-conductors of each of the conductor groups on the same circumferential side are respectively referred to as the unit phase first slot, the unit phase second slot, and the unit phase third slot, the two leg portions of the three sub-conductors of each of the conductor groups are inserted into the unit phase first slot-unit phase first slot, the unit phase second slot-unit phase third slot, the unit phase third slot-unit phase second slot, or the unit phase first slot-unit phase second slot, the unit phase second slot-unit phase first slot, or the unit phase third slot-unit phase third slot, of the adjacent layers and adjacent phases, At every pole and every phase, the subconductors (200) completely occupy each layer of three consecutive slots, or The subconductors (200) occupy three consecutive winding slots in the odd layers and three consecutive winding slots in the even layers, and when observed along the axial direction (A) of the stator core (10), the slots in the odd layers are aligned in the circumferential direction (C) of the stator core (10) and the slots in the even layers are aligned in the circumferential direction (C), and the winding slots of the subconductors (200) occupying adjacent even and odd layers are offset by one slot in the circumferential direction (C); or The slots occupied by the sub-conductors (200) occupy three consecutive inner winding slots in the M layers located radially inward, and three consecutive outer winding slots in the M layers located radially outward, and the three inner winding slots and the three outer winding slots are offset by one slot in the circumferential direction.

2. The rectangular wire stator winding (20) in each branch path satisfies the following conditions at the welded end: In a weld pair formed by two adjacent weld legs, only one is located on the same layer and the rest are all located on adjacent layers; The stator of the flat wire motor according to claim 1, characterized in that the two welded legs of the welding pair located on adjacent layers belong to the first slot of the unit phase, or the second slot of the unit phase, or the third slot of the unit phase.

3. The stator of the flat wire motor according to claim 2, characterized in that the two welded legs of a welded pair located on the same layer belong to the first slot of the unit phase and the second slot of the unit phase, respectively, or belong to the first slot of the unit phase and the third slot of the unit phase, respectively, or belong to the second slot of the unit phase and the third slot of the unit phase, respectively.

4. 3. The stator of claim 2, wherein the welding positions of the welding pairs located in the same layer are defined as nodes, and when observing the series connection order in which the sub-conductors (200) are welded in the circumferential direction of the stator core (10), the routing order of the sub-conductors (200) before and after the node in the circumferential direction is reversed.

5. The stator of the flat wire motor according to claim 1, characterized in that the spans of the three sub-conductors (200) of each conductor group are 7, 8, and 9, respectively, or 8, 9, and 10, respectively, or 9, 10, and 11, respectively.

6. The slots occupied by the subconductor (200) occupy three consecutive inner winding slots in the M layers located radially inward, and three consecutive outer winding slots in the M layers located radially outward, and the three inner winding slots and the three outer winding slots are offset by one slot in the circumferential direction; A stator for a flat wire motor as described in claim 5, characterized in that when M is an odd number, the span of the sub-conductors of the conductor group spanning the Mth layer and the (M+1)th layer is different from the span of the sub-conductors of the conductor group spanning other adjacent layers.

7. The span between two weld legs of a welded pair located on the same layer is 8 in one branch and 10 in the other branch, or 3. The stator of claim 2, wherein the span between the two welded legs of the welded pair located on the same layer is 7 in one branch path and 11 in the other branch path.

8. 2. The stator of claim 1, wherein the wire lead-out ends and the lead terminals of each of the branch paths are located on the same layer.

9. 9. The stator of claim 8, wherein the wire lead-out ends and the lead terminals of each branch path are located in the innermost layer in the radial direction or the outermost layer in the radial direction.

10. 2. The stator of claim 1, wherein the two branch paths are connected in series or the two branch paths are connected in parallel.

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