Armature winding and motor

Abstract

The utility model discloses an armature winding and a motor, and relates to the technical field of motors, the armature winding comprises a stator iron core and a stator winding, and the stator iron core is provided with 72 winding grooves; the stator winding comprises a plurality of flat wire conductors, four layers of flat wire conductors are arranged in each winding groove, the flat wire conductors are connected to form a three-phase winding, each phase winding comprises a first branch and a second branch which are connected in parallel, and each of the first branch and the second branch is provided with a leading-in end and a leading-out end. Each of the first branch and the second branch is formed by reciprocating winding of the leading-in end to the leading-out end in the adjacent layers of the winding grooves in the circumferential direction of the stator iron core, the leading-in end of the first branch and the leading-in end of the second branch are located on the same layer of the two winding grooves, and one winding groove is arranged between the leading-in end of the first branch and the leading-in end of the second branch. According to the technical scheme provided by the utility model, the positions of the winding outgoing lines are concentrated, and the busbar structure is simplified, so that the production cost is controlled.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an armature winding and a motor. Background Technology

[0002] Flat wire motors are increasingly being used in the drive systems of new energy vehicles due to their advantages in improving the voltage resistance of the windings and reducing the length of the winding ends.

[0003] Existing motors mainly employ wave winding or lap winding structures. By designing the flat wire conductors in the winding structure to have multiple layers, the AC resistance of the motor can be effectively reduced. However, as the number of flat wire conductor layers increases, the wiring method of the winding structure becomes increasingly complex, resulting in the dispersed positions of the winding leads. This leads to a complex subsequent bus topology, increasing the production cost of the motor. Utility Model Content

[0004] The main purpose of this invention is to propose an armature winding and motor that concentrates the winding lead positions, which helps to simplify the busbar structure and control production costs.

[0005] To achieve the above objectives, this utility model proposes an armature winding, the armature winding comprising:

[0006] Stator core, wherein the stator core is provided with 72 winding slots; and

[0007] The stator winding includes multiple flat wire conductors. Each winding slot has four layers of flat wire conductors. The flat wire conductors are connected to form a three-phase winding. Each phase winding includes a first branch and a second branch connected in parallel. The first branch and the second branch each have an input end and an output end. The first branch and the second branch are formed by reciprocating around the adjacent layers of the winding slot from the input end along the circumference of the stator core to the output end. The input end of the first branch and the input end of the second branch are located in the same layer of the two winding slots, and there is a winding slot between the input end of the first branch and the input end of the second branch.

[0008] In one embodiment, the lead-out end of the first branch and the lead-out end of the second branch are located in the same layer of adjacent winding slots, and the lead-in end and the lead-out end are located in the same layer of different winding slots.

[0009] In one embodiment, x and y are defined as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d], and the layer order of the winding slot from the inside to the outside is a, b, c, d;

[0010] The path of the first branch is:

[0011] 1d-12c-25d-36c-49d-61c-2d-13c-26d-37c-50d-60c-1b-12a-25b-36a-49b-61a-2b-13a-26b-37a-50b-60a- 2a-64b-51a-40b-27a-16b-3a-63b-50a-39b-26a-15b-2c-64d-51c-40d-27c-16d-3c-63d-50c-39d-26c-15d;

[0012] The path of the second branch is:

[0013] 3d-14c-27d-38c-51d-63c-4d-15c-28d-39c-52d-62c-3b-14a-27b-38a-51b-63a-4b-15a-28b-39a-52b-62a-1 a-61b-48a-37b-24a-13b-72a-62b-49a-38b-25a-14b-1c-61d-48c-37d-24c-13d-72c-62d-49c-38d-25c-14d;

[0014] In one embodiment, x and y are defined as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d], and the layer order of the winding slot from the inside to the outside is a, b, c, d;

[0015] The path of the first branch is:

[0016] 1d-11c-25d-35c-49d-60c-2d-12c-26d-36c-50d-59c-1b-11a-25b-35a-49b-60a-2b-12a-26b-36a-50b-59a- 1a-64b-50a-40b-26a-16b-2a-63b-49a-39b-25a-15b-1c-64d-50c-40d-26c-16d-2c-63d-49c-39d-25c-15d;

[0017] The path of the second branch is:

[0018] 3d-13c-27d-37c-51d-62c-4d-14c-28d-38c-52d-61c-3b-13a-27b-37a-51b-62a-4b-14a-28b-38a-52b-61a-72 a-61b-47a-37b-23a-13b-71a-62b-48a-38b-24a-14b-72c-61d-47c-37d-23c-13d-71c-62d-48c-38d-24c-14d;

[0019] In one embodiment, the three-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding, wherein the U-phase winding includes the first branch and the second branch;

[0020] The V-phase winding is obtained by rotating the U-phase winding by 8 slots relative to the winding slot position in the direction of increasing slot position.

[0021] The W-phase winding is obtained by rotating the U-phase winding 16 slots relative to the winding slots in the direction of increasing slot size.

[0022] In one embodiment, the first branch includes a first part and a second part connected together, the starting end of the first part being the inlet end of the first branch, and the ending end of the second part being the outlet end of the first branch.

[0023] The first part and the second part each include a plurality of flat wire conductors, which are sequentially welded together. The beginning and end ends of each flat wire conductor pass through adjacent layers of different winding grooves. The end of the first part and the beginning end of the second part are located in the same layer of different winding grooves and are connected by welding.

[0024] In one embodiment, the second branch includes a connected third part and a fourth part, wherein the starting end of the third part is the inlet end of the second branch, and the ending end of the fourth part is the outlet end of the second branch.

[0025] The third part and the fourth part each include a plurality of flat wire conductors, which are sequentially welded together. The beginning and end ends of each flat wire conductor pass through adjacent layers of different winding grooves. The end of the third part and the beginning end of the fourth part are located in the same layer of different winding grooves and are connected by welding.

[0026] In one embodiment, the flat conductor is a hairpin flat conductor.

[0027] This utility model also proposes an electric motor, which includes the armature winding as described above.

[0028] In the technical solution of this utility model, the stator core is provided with 72 winding slots. The 72 winding slots are arranged at intervals along the circumference of the stator core and extend along the axial direction of the stator core, penetrating the end wall of the stator core. Each phase winding includes two parallel branches. The first branch and the second branch both have an inlet end and an outlet end. The first branch and the second branch are formed by reciprocating around the inlet end along the circumference of the stator core in adjacent layers of the winding slots to the outlet end. The inlet end of the first branch and the inlet end of the second branch are located in the same layer of different winding slots, and the inlet end of the first branch and the inlet end of the second branch are separated by one winding slot. This makes the outlet position of the armature winding concentrated, which helps to simplify the busbar structure and reduce production costs. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0030] Figure 1 A schematic diagram of the U-phase winding in Embodiment 1 of the armature winding provided by this utility model;

[0031] Figure 2 A schematic diagram of the first part of the U-phase first branch winding in Embodiment 1 of the armature winding provided by this utility model;

[0032] Figure 3 A schematic diagram of the second part of the U-phase first branch winding in Embodiment 1 of the armature winding provided by this utility model;

[0033] Figure 4 A schematic diagram of the first part of the U-phase second branch winding in Embodiment 1 of the armature winding provided by this utility model;

[0034] Figure 5 A schematic diagram of the second part of the U-phase second branch winding in Embodiment 1 of the armature winding provided by this utility model;

[0035] Figure 6 A schematic diagram of the U-phase winding in Embodiment 2 of the armature winding provided by this utility model;

[0036] Figure 7 A schematic diagram of the first part of the U-phase first branch winding in Embodiment 2 of the armature winding provided by this utility model;

[0037] Figure 8A schematic diagram of the second part of the U-phase first branch winding in Embodiment 2 of the armature winding provided by this utility model;

[0038] Figure 9 A schematic diagram of the first part of the U-phase second branch winding in Embodiment 2 of the armature winding provided by this utility model;

[0039] Figure 10 This is a schematic diagram of the second part of the U-phase second branch winding in Embodiment 2 of the armature winding provided by this utility model.

[0040] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0042] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0043] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0044] This utility model proposes an armature winding, which includes a stator core and a stator winding. The stator core has 72 winding slots. The stator winding includes multiple flat wire conductors. Each winding slot has 4 layers of flat wire conductors. The flat wire conductors are connected to form a three-phase winding. Each phase winding includes a first branch and a second branch connected in parallel. The first branch and the second branch both have an inlet end and an outlet end. The first branch and the second branch are formed by reciprocating along the circumference of the stator core in adjacent layers of the winding slot from the inlet end to the outlet end. The inlet end of the first branch and the inlet end of the second branch are located in the same layer of the two winding slots, and there is a winding slot between the inlet end of the first branch and the inlet end of the second branch.

[0045] In this embodiment, the stator core has 72 winding slots, which are spaced apart circumferentially along the stator core and extend axially along the stator core, penetrating the end wall of the stator core. Each phase winding includes two parallel branches. The lead-in end of the first branch and the lead-in end of the second branch are located in the same layer of different winding slots, and the lead-in end of the first branch and the lead-in end of the second branch are separated by one winding slot. This concentrates the lead-out positions of the armature winding, which helps to simplify the busbar structure and reduce production costs.

[0046] In this embodiment, the flat wire conductor has 4 layers. In actual implementation, even-numbered flat wire conductor armature windings with 6, 8, or 10 layers can be achieved by increasing the number of layers of cross-wires.

[0047] In one embodiment, the lead-out ends of the first branch and the second branch are located on the same layer of adjacent winding slots, while the lead-in and lead-out ends are located on the same layer of different winding slots. This facilitates the connection and disconnection of the armature winding and the arrangement of the busbar.

[0048] Figures 1 to 10 In the diagram, solid lines represent connections at the card-issuing end, and dashed lines represent connections at the welding end.

[0049] like Figures 1 to 10 As shown, the winding provided in this embodiment of the present invention has 4 layers of slots. Taking a flat wire conductor of three-phase parallel two-branch circuits wound through 4 layers of 72 winding slots as an example, the number of poles is 6.

[0050] Example 1:

[0051] In one embodiment of this utility model, such as Figures 1 to 5 As shown, x and y are defined as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d]. The layer order of the winding slots from the inside to the outside is a, b, c, d. For example, 4d refers to the d-th layer of the 4th winding slot.

[0052] The path of the first branch is:

[0053] 1d-12c-25d-36c-49d-61c-2d-13c-26d-37c-50d-60c-1b-12a-25b-36a-49b-61a-2b-13a-26b-37a-50b-60a- 2a-64b-51a-40b-27a-16b-3a-63b-50a-39b-26a-15b-2c-64d-51c-40d-27c-16d-3c-63d-50c-39d-26c-15d;

[0054] The path of the second branch is:

[0055] 3d-14c-27d-38c-51d-63c-4d-15c-28d-39c-52d-62c-3b-14a-27b-38a-51b-63a-4b-15a-28b-39a-52b-62a-1 a-61b-48a-37b-24a-13b-72a-62b-49a-38b-25a-14b-1c-61d-48c-37d-24c-13d-72c-62d-49c-38d-25c-14d;

[0056] In this embodiment, as Figure 1 As shown, the inlet of the first branch is in the d-th layer of the first winding slot, and the outlet of the first branch is in the d-th layer of the 15th winding slot. The inlet of the second branch is in the d-th layer of the third winding slot, and the outlet of the second branch is in the d-th layer of the 14th winding slot. This arrangement ensures that the inlet of the first branch and the inlet of the second branch are separated by one winding slot. The outlets of the first and second branches are located in two adjacent winding slots. The inlet and outlet of the first branch and the inlet and outlet of the second branch are located in the same layer of different winding slots, and this layer is the outermost layer of the winding slot. This results in a simple armature winding structure, good manufacturability, and facilitates the simplification of the busbar structure, laying a solid foundation for cost control.

[0057] In this embodiment, the first branch includes a first part and a second part connected together, and the winding of the first part is as follows: Figure 2 As shown, the second part of the winding is as follows Figure 3As shown, the starting end of the first part is the inlet end of the first branch, and the ending end of the second part is the outlet end of the first branch. In both the first and second parts, the portion of the flat wire conductor that enters the winding slot is located in adjacent layers of different winding slots. In the first part, the portion of the flat wire conductor that enters the winding slot starts at the inlet end, the first winding slot, the d layer, and is wound twice along the circumference of the stator core, alternating between layers d and c of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers b and a of the winding slot, before reaching the outlet end, the 60th winding slot, the a layer. In the second part, the portion of the flat wire conductor that enters the winding slot starts at the starting end, the second winding slot, the a layer, and is wound twice along the circumference of the stator core, alternating between layers a and b of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers c and d of the winding slot, before reaching the outlet end, the 15th winding slot, the d layer.

[0058] The second branch includes the connecting third and fourth parts, and the winding of the third part is as follows: Figure 4 As shown, the winding of the fourth part is as follows Figure 5 As shown, the starting end of the third part is the inlet end of the second branch, and the ending end of the second part is the outlet end of the second branch. In both the third and fourth parts, the portion of the flat wire conductor that enters the winding slot is located in adjacent layers of different winding slots. In the third part, the flat wire conductor's entry portion starts at the inlet end, the d-th layer of the 3rd winding slot, and is wound twice along the circumference of the stator core, alternating between layers d and c of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers b and a of the winding slot, before reaching the outlet end, the a-th layer of the 62nd winding slot. In the fourth part, the flat wire conductor's entry portion starts at the starting end, the a-th layer of the 1st winding slot, and is wound twice along the circumference of the stator core, alternating between layers a and b of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers c and d of the winding slot, before reaching the outlet end, the d-th layer of the 14th winding slot.

[0059] Understandably, the first and second branches traverse the available phase bands and winding slot layers to ensure potential balance and prevent circulating currents. In this embodiment, the number of poles is 6, and the pitch of the flat wire conductors in the first and second branches is mostly 11 to reduce the 11th and 13th harmonics of the armature winding. The uniform span of most flat wire conductors reduces the number of hairpin flat wire types used, facilitating automated armature winding production and cost reduction.

[0060] Example 2:

[0061] In one embodiment of this utility model, such as Figures 6 to 10 As shown, x and y are defined as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d]. The layer order of the winding slots from the inside to the outside is a, b, c, d. For example, 4d refers to the d-th layer of the 4th winding slot.

[0062] The path of the first branch is:

[0063] 1d-11c-25d-35c-49d-60c-2d-12c-26d-36c-50d-59c-1b-11a-25b-35a-49b-60a-2b-12a-26b-36a-50b-59a- 1a-64b-50a-40b-26a-16b-2a-63b-49a-39b-25a-15b-1c-64d-50c-40d-26c-16d-2c-63d-49c-39d-25c-15d;

[0064] The path of the second branch is:

[0065] 3d-13c-27d-37c-51d-62c-4d-14c-28d-38c-52d-61c-3b-13a-27b-37a-51b-62a-4b-14a-28b-38a-52b-61a-72 a-61b-47a-37b-23a-13b-71a-62b-48a-38b-24a-14b-72c-61d-47c-37d-23c-13d-71c-62d-48c-38d-24c-14d;

[0066] In this embodiment, as Figure 6 As shown, the inlet of the first branch is in the d-th layer of the first winding slot, and the outlet of the first branch is in the d-th layer of the 15th winding slot. The inlet of the second branch is in the d-th layer of the third winding slot, and the outlet of the second branch is in the d-th layer of the 14th winding slot. This arrangement ensures that the inlet of the first branch and the inlet of the second branch are separated by one winding slot. The outlets of the first and second branches are located in two adjacent winding slots. The inlet and outlet of the first branch and the inlet and outlet of the second branch are located in the same layer of different winding slots, and this layer is the outermost layer of the winding slot. This results in a simple armature winding structure, good manufacturability, and facilitates the simplification of the busbar structure, laying a solid foundation for cost control.

[0067] In this embodiment, the first branch includes a first part and a second part connected together, and the winding of the first part is as follows: Figure 7 As shown, the second part of the winding is as follows Figure 8As shown, the starting end of the first part is the inlet end of the first branch, and the ending end of the second part is the outlet end of the first branch. In both the first and second parts, the portion of the flat wire conductor that passes through the winding slot is located in adjacent layers of different winding slots. In the first part, the portion of the flat wire conductor that passes through the winding slot starts at the inlet end, winds alternately twice along the circumference of the stator core in layers d and c of the winding slot, then winds alternately twice along the circumference of the stator core in layers b and a of the winding slot, before reaching the outlet end, the 59th winding slot, layer a. In the second part, the portion of the flat wire conductor that passes through the winding slot starts at the inlet end, winds alternately twice along the circumference of the stator core in layers a and b of the winding slot, then winds alternately twice along the circumference of the stator core in layers c and d of the winding slot, before reaching the outlet end, the 15th winding slot, layer d.

[0068] The second branch includes the connecting third and fourth parts, and the winding of the third part is as follows: Figure 9 As shown, the winding of the fourth part is as follows Figure 10 As shown, the starting end of the third part is the inlet end of the second branch, and the ending end of the second part is the outlet end of the second branch. In both the third and fourth parts, the portion of the flat conductor that enters the winding slot is located in adjacent layers of different winding slots. In the third part, the flat conductor's entry portion starts at the inlet end, the d-th layer of the 3rd winding slot, and is wound twice along the circumference of the stator core, alternating between layers d and c of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers b and a of the winding slot, before reaching the outlet end, the a-th layer of the 61st winding slot. In the fourth part, the flat conductor's entry portion starts at the starting end, the a-th layer of the 72nd winding slot, and is wound twice along the circumference of the stator core, alternating between layers a and b of the winding slot. Then, it is wound twice along the circumference of the stator core, alternating between layers c and d of the winding slot, before reaching the outlet end, the d-th layer of the 14th winding slot.

[0069] Understandably, the first and second branches traverse the available phase bands and winding slot layers to ensure potential balance and prevent circulating currents. In this embodiment, the number of poles is 6, and the pitch in most of the first and second branches is 10 to reduce the 5th and 7th harmonics of the armature winding. The uniform span of most flat conductors reduces the number of hairpin flat wire types used, facilitating automated armature winding production and cost reduction.

[0070] In one embodiment of this utility model, the three-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding. The U-phase winding includes a first branch and a second branch. The V-phase winding is obtained by rotating the U-phase winding by 8 slots relative to the U-phase winding along the direction of increasing winding slot size. The W-phase winding is obtained by rotating the U-phase winding by 16 slots relative to the U-phase winding along the direction of increasing winding slot size.

[0071] In this embodiment, the U-phase winding, the V-phase sleeve, and the lead-out ends of the U-phase winding are all located on the same layer of different winding slots, and the lead-out ends of different branches in the same phase winding are located on the same layer of adjacent windings. This simplifies the busbar structure of the armature winding and helps reduce the production cost of the motor.

[0072] In one embodiment of the present invention, the first branch includes a first part and a second part connected together, the starting end of the first part being the inlet end of the first branch, and the ending end of the second part being the outlet end of the first branch.

[0073] The first part and the second part each include multiple flat wire conductors, which are welded together in sequence. The beginning and end ends of each flat wire conductor pass through adjacent layers of different winding slots. The end of the first part and the beginning of the second part are located in the same layer of different winding slots and are connected by welding.

[0074] In one embodiment of the present invention, the second branch includes a third part and a fourth part connected together, the starting end of the third part being the inlet end of the second branch, and the ending end of the fourth part being the outlet end of the second branch.

[0075] The third and fourth parts each include multiple flat conductors, which are welded together in sequence. The beginning and end ends of each flat conductor pass through adjacent layers of different winding slots. The end of the third part and the beginning of the fourth part are located in the same layer of different winding slots and are connected by welding.

[0076] Specifically, the flat conductor is a hairpin-type flat wire, such as... Figures 1 to 10 In the diagram, xn, xn is a hairpin, yn, yn is a hairpin, an, an is a hairpin, bn, bn is a hairpin, where n∈[1,12]; for example, x1, x1 is a hairpin. an, an are hairpins in the first part of the first branch, bn, bn are hairpins in the second part of the first branch, xn, xn are hairpins in the first part of the second branch, yn, yn are hairpins in the second part of the second branch. a12, a12 hairpin is connected to b12, b12 hairpin, x12, x12 hairpin is connected to y12, y12 hairpin.

[0077] In one embodiment of this utility model, the flat conductor is a hairpin-type flat wire.

[0078] In this embodiment, the hairpin flat wire includes a straight portion passing through the winding groove and a connecting portion and a bending portion at both ends of the straight portion. The two straight portions are connected by the connecting portion to form a flat wire conductor. The two branches have a bending portion at the end away from the connecting portion. The bending portion is bent towards the side of the straight portion away from the connecting portion. When the flat wire conductor is inserted into the winding groove, the connecting portion forms the hairpin end of the armature winding, and the bending portion forms the welding end of the armature winding.

[0079] In practice, the flat conductor can be inserted into the winding groove, and then the end of the flat conductor can be bent to form a bend. The bend of one flat conductor is bent toward another flat conductor connected to it. No specific limitation is made here.

[0080] In summary, the armature winding proposed in this invention is beneficial for improving the slot fill factor of the motor, thereby generating a higher magnetic field strength, increasing the motor power, balancing the potential of each branch, eliminating circulating current problems, and having a simple winding structure with good manufacturability. The concentrated position of the winding leads helps to simplify the busbar structure and lays a good foundation for cost control. At the same time, the short-pitch design of most conductors helps to reduce harmonics and improve NVH.

[0081] This utility model also proposes an electric motor, which includes an armature winding. The specific structure of the armature winding is as described in the above embodiments. Since this electric motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0082] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. An armature winding, characterized in that, The armature winding includes: Stator core, wherein the stator core is provided with 72 winding slots; and The stator winding includes multiple flat wire conductors. Each winding slot has four layers of flat wire conductors. The flat wire conductors are connected to form a three-phase winding. Each phase winding includes a first branch and a second branch connected in parallel. The first branch and the second branch each have an input end and an output end. The first branch and the second branch are formed by reciprocating around the adjacent layers of the winding slot from the input end along the circumference of the stator core to the output end. The input end of the first branch and the input end of the second branch are located in the same layer of the two winding slots, and there is a winding slot between the input end of the first branch and the input end of the second branch.

2. The armature winding as described in claim 1, characterized in that, The lead-out ends of the first branch and the second branch are located on the same layer of adjacent winding slots, while the lead-in end and the lead-out end are located on the same layer of different winding slots.

3. The armature winding as described in claim 1, characterized in that, Define x and y as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d], and the layer order of the winding slot from the inside to the outside is a, b, c, d; The first branch road is: 1d-12c-25d-36c-49d-61c-2d-13c-26d-37c-50d-60c-1b-12a-25b-36a-49b-61a-2b-13a-26b-37a-50b-60a- 2a-64b-51a-40b-27a-16b-3a-63b-50a-39b-26a-15b-2c-64d-51c-40d-27c-16d-3c-63d-50c-39d-26c-15d; The second branch road is: 3d-14c-27d-38c-51d-63c-4d-15c-28d-39c-52d-62c-3b-14a-27b-38a-51b-63a-4b-15a-28b-39a-52b-62a-1 a-61b-48a-37b-24a-13b-72a-62b-49a-38b-25a-14b-1c-61d-48c-37d-24c-13d-72c-62d-49c-38d-25c-14d.

4. The armature winding as described in claim 1, characterized in that, Define x and y as the y-th layer of the x-th winding slot, where x∈[1,72] and y∈[a,d], and the layer order of the winding slot from the inside to the outside is a, b, c, d; The first branch road is: 1d-11c-25d-35c-49d-60c-2d-12c-26d-36c-50d-59c-1b-11a-25b-35a-49b-60a-2b-12a-26b-36a-50b-59a- 1a-64b-50a-40b-26a-16b-2a-63b-49a-39b-25a-15b-1c-64d-50c-40d-26c-16d-2c-63d-49c-39d-25c-15d; The second branch road is: 3d-13c-27d-37c-51d-62c-4d-14c-28d-38c-52d-61c-3b-13a-27b-37a-51b-62a-4b-14a-28b-38a-52b-61a-72 a-61b-47a-37b-23a-13b-71a-62b-48a-38b-24a-14b-72c-61d-47c-37d-23c-13d-71c-62d-48c-38d-24c-14d.

5. The armature winding as described in claim 1, characterized in that, The three-phase windings include a U-phase winding, a V-phase winding, and a W-phase winding, wherein the U-phase winding includes the first branch and the second branch; The V-phase winding is obtained by rotating the U-phase winding by 8 slots relative to the winding slot position in the direction of increasing slot position. The W-phase winding is obtained by rotating the U-phase winding 16 slots relative to the winding slots in the direction of increasing slot size.

6. The armature winding as described in claim 1, characterized in that, The first branch includes a first part and a second part that are connected. The starting end of the first part is the inlet end of the first branch, and the ending end of the second part is the outlet end of the first branch. The first part and the second part each include a plurality of flat wire conductors, which are sequentially welded together. The beginning and end ends of each flat wire conductor pass through adjacent layers of different winding grooves. The end of the first part and the beginning end of the second part are located in the same layer of different winding grooves and are connected by welding.

7. The armature winding as described in claim 1, characterized in that, The second branch includes a third part and a fourth part that are connected. The starting end of the third part is the inlet end of the second branch, and the ending end of the fourth part is the outlet end of the second branch. The third part and the fourth part each include a plurality of flat wire conductors, which are sequentially welded together. The beginning and end ends of each flat wire conductor pass through adjacent layers of different winding grooves. The end of the third part and the beginning end of the fourth part are located in the same layer of different winding grooves and are connected by welding.

8. The armature winding as described in any one of claims 1 to 7, characterized in that, The flat conductor is a hairpin flat wire.

9. An electric motor, characterized in that, The motor includes an armature winding as described in any one of claims 1 to 8.

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