Stator assembly, motor and vehicle

Abstract

This invention provides a stator assembly, a motor, and a vehicle. The stator assembly includes a stator core and a three-phase stator winding. Any phase of the three-phase stator winding includes *a* parallel branches, where *a* is 1 or 2. Each parallel branch has *P* adjacent combination slots, each adjacent combination slot having *q* slots. The number of slot layers occupied by each adjacent combination slot is different, and each slot in each adjacent combination slot occupies 4 slot layers. At least *P / 4* adjacent combination slots have *q* slots arranged adjacently in their slot layers. At least one slot in *P / 2* adjacent combination slots has its slot layer divided into two groups. At least one slot in *P / 4* adjacent combination slots has its slot layer divided into two groups. At least one slot in *P* adjacent combination slots has its slot layer arranged adjacently. This invention solves the problems of circulating current easily generated between multiple parallel branches of the three-phase stator winding in the prior art, and the complex manufacturing process and high manufacturing cost caused by the variety of hairpin coil wire types.

Description

Technical Field

[0001] This invention belongs to the field of motor technology, specifically relating to stator assemblies, motors, and vehicles including the motors. Background Technology

[0002] With the promotion of new energy vehicles, electric vehicles are becoming increasingly popular, and the market demand for the performance of electric vehicle power systems is rising. The main drive motor is one of the core components of an electric vehicle, and it is developing towards higher power density and torque density, smaller size, and lighter weight. With the development of flat wire technology, electric vehicle main drive motors are gradually adopting flat wire windings, which can improve the stator slot fill factor, increase the cross-sectional area of ​​copper conductors, reduce motor size, and further improve the motor's power density, efficiency, and thermal conductivity.

[0003] In existing technologies, flat-wire motors mainly employ wave-wound or multi-layered winding structures. By designing the flat wires in the winding structure into a multi-layered structure, the AC resistance of the motor can be effectively reduced. However, as the number of flat wires increases, the wiring method of the winding structure also changes. In existing technologies, when connecting the phase branches of the stator winding, the twisting direction at the outer end of the coil slot or the distance between the twisted slots is inconsistent. This results in a wide variety of hairpin coils being used, complex manufacturing processes, difficult forming, high production costs, and low processing efficiency. Furthermore, due to the complex motor winding structure, potential imbalances easily occur between branches of the same phase, leading to circulating currents between branches, affecting motor efficiency and temperature rise. Summary of the Invention

[0004] This invention provides a stator assembly, a motor, and a vehicle, which can solve the problems of circulating current easily generated between multiple parallel branches of the three-phase stator windings in the prior art, and the complex production process and high manufacturing cost caused by the variety of hairpin coil wire types.

[0005] To achieve the above-mentioned technical effects, the technical solution adopted by the present invention is a stator assembly, comprising:

[0006] The stator core has Z stator slots evenly distributed circumferentially on its inner wall, and each stator slot is divided into 8 slot layers along the radial direction of the stator core;

[0007] The three-phase stator windings are wound around the stator core and symmetrically distributed circumferentially along the stator core. Each phase of the three-phase stator winding includes *a* parallel branches, where *a* is 1 or 2. When *a* is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core. Each parallel branch contains multiple hairpin coils with different spans. Each stator slot contains 8 layers of hairpin coils, and the hairpin coils of this parallel branch traverse 8 slot layers in different stator slots. Each parallel branch has *P* adjacent combination slots, where *P* is the number of poles of the motor, and the number of slots in each adjacent combination slot is *q*, where *q* = *Z* / *P ... 3. The number of slot layers occupied by each adjacent combination of slots is different, and the number of slot layers occupied by each slot in each adjacent combination of slots is 4; the slot layers occupied by q slots in P / 4 adjacent combination of slots are all arranged adjacently; at least one slot in P / 2 adjacent combination of slots is divided into two groups, one group occupies 1 slot layer and the other group occupies 3 slot layers, with a gap of 4 slot layers between the two groups; at least one slot in P / 4 adjacent combination of slots is divided into two groups, both groups occupy 2 slot layers, with a gap of 4 slot layers between the two groups; at least one slot in P adjacent combination of slots is arranged adjacently.

[0008] When a=2, the span combination of the outermost and innermost hairpin coils of the two parallel branches is (Z / P+1), Z / P, and (Z / P-1), and the ratio of the number of hairpin coils of the three spans is 1:5:1.

[0009] When a=2, the voltage leads of the two parallel branches are respectively led out from the same layer of the two adjacent slots of the same adjacent combined slot, and the neutral point lead is also led out from the same layer of the two adjacent slots of the same adjacent combined slot, and the same layer is the outermost or innermost layer of the stator slot; the voltage lead and the neutral point lead of each parallel branch are separated by Z / P stator slots.

[0010] The hairpin coil includes two straight segments and a bent segment and a welded segment connecting the two straight segments.

[0011] The voltage leads and neutral point leads of the three-phase stator windings are both connected in a star or delta configuration.

[0012] The present invention also proposes an electric motor, including a rotor and a stator assembly, wherein the stator assembly is the stator assembly described above.

[0013] The present invention also proposes a vehicle including the aforementioned motor.

[0014] Compared with the prior art, the present invention has the following advantages and positive effects:

[0015] 1. The stator assembly of the present invention has stator slots on the inner wall of the stator core divided into 8 slot layers along the radial direction of the stator core. The three-phase stator windings are symmetrically distributed along the circumference of the stator core. When any phase winding includes 2 parallel branches, the 2 parallel branches are also rotate symmetrical in the circumferential direction of the stator core. This makes the magnetic field distribution of multiple parallel branches in each phase winding the same, the magnetomotive force is balanced, avoids the circulating current between parallel branches, improves motor efficiency, avoids local overheating of the winding, and extends the life of the flat wire motor.

[0016] 2. The slot layer distribution of each parallel branch makes each adjacent combination slot correspond to one pole of the motor. The N pole and S pole of the motor are arranged alternately. Therefore, the current flowing through each hairpin coil is arranged alternately with positive and negative directions, which facilitates winding and reduces the number of wire types of cross-layer hairpin coils, making it easier to manufacture and facilitating automated production. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional structural diagram of the stator assembly of the motor in an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the three-dimensional structure of the stator core of the stator assembly in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the U-shaped hairpin coil structure in an embodiment of the present invention;

[0021] Figure 4 This is a circuit diagram showing that the two parallel branches of each phase winding in the three-phase stator winding of the stator assembly in an embodiment of the present invention are connected in a star configuration.

[0022] Figure 5 This is a circuit diagram showing that the two parallel branches of each phase winding in the three-phase stator winding of the stator assembly in an embodiment of the present invention are connected in a delta configuration.

[0023] Figure 6 This is a diagram showing the slot layer distribution of the first parallel branch of the A-phase winding of an 8-pole 48-slot motor in an embodiment of the present invention.

[0024] Figure 7 This is a diagram showing the slot layer distribution of the second parallel branch of the A-phase winding of an 8-pole 48-slot motor in an embodiment of the present invention.

[0025] Figure 8 This is a diagram showing the winding configuration of the first parallel branch of the A-phase winding of an 8-pole 48-slot motor in an embodiment of the present invention.

[0026] Figure 9 for Figure 8 Enlarged view of the middle section (I);

[0027] Figure 10 This is a diagram showing the winding configuration of the second parallel branch of the A-phase winding of an 8-pole 48-slot motor in an embodiment of the present invention.

[0028] Figure 11 for Figure 10 Enlarged view of Part II;

[0029] Figure 12 This is a diagram showing the winding configuration of the A-phase winding of an 8-pole, 48-slot motor in an embodiment of the present invention.

[0030] Figure 13 for Figure 12 Enlarged view of Part III;

[0031] Figure 14 This is an unfolded diagram of the three-phase winding method of an 8-pole 48-slot motor in an embodiment of the present invention;

[0032] Figure 15 for Figure 14 Enlarged view of Part IV.

[0033] Reference numerals: 10, stator assembly; 11, stator core; 12, three-phase stator winding; 13, stator slot; 20, U-shaped hairpin coil; 21, bent connection section; 22, straight section; 23, welded section. Detailed Implementation

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] For ease of understanding, the technical terms used in this application will be explained below.

[0037] Stator: refers to the stationary part of an electric motor, whose function is to generate a rotating magnetic field.

[0038] Rotor: refers to the rotating part in an electric motor, which is used to convert electrical energy into mechanical energy.

[0039] This invention provides an electric motor, including a rotor and a stator assembly 10, wherein the rotor is disposed within a space formed by the inner wall of the stator core 11 of the stator assembly 10. Figure 1 and Figure 2 As shown, the stator assembly 10 includes a stator core 11 and three-phase stator windings 12 wound in the stator core 11. Z stator slots 13 are evenly distributed circumferentially on the inner wall of the stator core 11. Each stator slot 13 is divided into 8 slot layers along the radial direction of the stator core 11. The three-phase stator windings 12 are symmetrically distributed circumferentially along the stator core 11. Where Z is a positive integer.

[0040] like Figure 3 As shown, each stator slot 13 is divided into 8 slot layers along the radial direction of the stator core 11. The first layer is denoted as D1, the second layer as D2, the third layer as D3, the fourth layer as D4, the fifth layer as D5, the sixth layer as D6, the seventh layer as D7, and the eighth layer as D8. The first slot layer is the bottom layer of the stator slot 13, and the eighth slot layer is the top layer. Alternatively, the first slot layer is the top layer of the stator slot 13, and the eighth slot layer is the bottom layer. The top layer is also called the innermost layer, and the bottom layer is also called the outermost layer.

[0041] In the three-phase stator windings 12 (phase A, phase B, and phase C), any one phase winding includes a parallel branches, where a is 1 or 2. When a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core. By limiting the rotational symmetry of the two parallel branches in each phase winding, the magnetic field distribution of the two parallel branches in each phase winding is the same, and the magnetomotive force is balanced. This avoids the circulating current between the parallel branches, thereby significantly reducing the additional AC copper loss under high-speed conditions, improving the efficiency of the flat wire motor, and avoiding local overheating of the winding, thus extending the life of the flat wire motor.

[0042] Each parallel branch contains multiple hairpin coils with different spans. Each stator slot has 8 layers of hairpin coils, and the hairpin coils of the parallel branch traverse 8 slot layers in different stator slots.

[0043] Each parallel branch has P adjacent combination slots, where P is the number of poles of the motor, and the number of slots in each adjacent combination slot is q, where q = Z / P / 3, and 3 is the number of phases of the three-phase stator winding. The number of slot layers occupied by each adjacent combination slot is different, and each slot in each adjacent combination slot occupies 4 slot layers. Among the P adjacent combination slots, q slots from P / 4 adjacent combination slots occupy adjacent slot layers; that is, in these P / 4 adjacent combination slots, the q slots from each adjacent combination slot occupy adjacent slot layers. In a P / 2 adjacent combination of combined slots, at least one slot occupies two spaced-out groups of slot layers, one group occupies 1 slot layer and the other group occupies 3 slot layers, with a gap of 4 slot layers between the two groups; In a P adjacent combination of slots, q slots in a P / 4 adjacent combination of slots occupy two spaced-out groups of slot layers, one group occupies 2 slot layers and the other group also occupies 2 slot layers, with a gap of 4 slot layers between the two groups; In a P adjacent combination of slots, at least one slot occupies slot layers that are arranged adjacently.

[0044] Specifically, for any parallel branch winding, the meaning of an adjacent combination slot refers to the combination of several adjacent slots in the stator slots occupied by the hairpin coil of that parallel branch winding. The number of adjacent combination slots corresponds to the number of poles in the motor. For example... Figure 6 , 7 The 8-pole, 48-slot motor shown has P=8 and Z=48. Slots 1 and 2 form an adjacent combination, slots 7 and 8 form an adjacent combination, slots 13 and 14 form an adjacent combination, slots 19 and 20 form an adjacent combination, slots 25 and 26 form an adjacent combination, slots 31 and 32 form an adjacent combination, slots 37 and 38 form an adjacent combination, and slots 43 and 44 form an adjacent combination, for a total of 8 adjacent combination slots. From left to right, these are the 1st to 8th adjacent combination slots. The number of slots in each adjacent combination is q=48 / 8 / 3=2.

[0045] The q slots in an adjacent combination of slots are all arranged adjacently, meaning that the occupied slot layers in each slot of the adjacent combination of slots are adjacent and not separated, such as... Figure 6 The 8-pole 48-slot motor shown has q slots (i.e., two slots) in the 4th (i.e., adjacent combination slots composed of slots 19 and 20) and 8th (i.e., adjacent combination slots composed of slots 43 and 44) ​​adjacent combination slots of the first parallel branch of the A-phase winding. The slot layers occupied by these q slots are arranged adjacently. The remaining q slots (i.e., two slots) in the adjacent combination slots have non-adjacent slot layers. For example, the 1st slot of the 1st adjacent combination slot occupies slot layers 1, 6, 7, and 8. Slot layers 1 and 6 are not adjacent. Another example is slot 7 of the 2nd adjacent combination slot, slot 13 of the 3rd adjacent combination slot, slot 26 of the 5th adjacent combination slot, slot 32 of the 6th adjacent combination slot, and slot 38 of the 7th adjacent combination slot.

[0046] Similarly, such as Figure 7 As shown, the slots of the 4th and 8th adjacent combined slots of the 2nd parallel branch of the A phase winding are arranged in adjacent slot layers. The slots of the other adjacent combined slots are not adjacent, such as the 2nd slot of the 1st adjacent combined slot, etc.

[0047] In P / 2 adjacent combination slots, at least one slot occupies two groups of slot layers with intervals. One group occupies 1 slot layer, and the other group occupies 3 slot layers. The two groups of slot layers are separated by 4 slot layers. Specifically, taking P=8 as an example, among these 4 adjacent combination slots, there are stator slots with non-adjacent slot layers. For example, in the first adjacent combination slot of the first parallel branch of the A phase winding, the slot 1 occupied by slot layers 1, 6, 7, and 8 is one group with 1 slot layer, and slot layers 6, 7, and 8 are another group with 3 slot layers. The two groups of slot layers are separated by 4 slot layers. Figure 6 In the first parallel branch of the A-phase winding shown, the P / 2 adjacent combination slots that conform to this slot layer distribution pattern are the 1st, 3rd, 5th, and 7th adjacent combination slots; similarly, Figure 7 In the second parallel branch of the A-phase winding shown, the P / 2 adjacent combination slots that conform to this slot layer distribution pattern are the 1st, 3rd, 5th, and 7th adjacent combination slots.

[0048] In P / 4 adjacent combination slots, at least one slot occupies two groups of slot layers, with each group occupying 2 slot layers, and the two groups of slot layers are separated by 4 slot layers. Specifically, taking P=8 as an example, among these two adjacent combination slots, there are stator slots with non-adjacent slot layers. For example, in the second adjacent combination slot of the first parallel branch of the A phase winding, the slot 7 is occupied by slot layers 1, 2, 7, and 8. Slot layers 1 and 2 form one group, occupying 2 slot layers, while slot layers 7 and 8 form another group, occupying 2 slot layers, with the two groups of slot layers separated by 4 slot layers. Figure 6 In the first parallel branch of the A-phase winding shown, the P / 4 adjacent combination slots that conform to this slot layer distribution pattern are the 2nd and 6th adjacent combination slots; similarly, Figure 7 In the second parallel branch of the A-phase winding shown, the P / 4 adjacent combination slots that conform to this slot layer distribution pattern are the 2nd and 6th adjacent combination slots.

[0049] In a P-group of adjacent combination slots, at least one slot occupies an adjacent slot layer. Specifically, taking P=8 as an example, for the first parallel branch of phase A winding, 10 out of the 8 adjacent combination slots occupy an adjacent slot layer, namely slots 2, 8, 14, 19, 20, 25, 31, 37, 43, and 44.

[0050] The aforementioned slot layer distribution ensures that each adjacent slot combination corresponds to one pole of the motor, with the N and S poles of the motor arranged alternately. Therefore, the current flowing through each hairpin coil is arranged in alternating positive and negative directions, facilitating winding and reducing the variety of wire types for cross-layer hairpin coils during winding. Figures 8 to 11 As shown, there are only three types of cross-layer hairpin coils: the cross-layer hairpin coil between the 2nd and 3rd slot layers, the cross-layer hairpin coil between the 4th and 5th slot layers, and the cross-layer hairpin coil between the 6th and 7th slot layers. This makes it easy to manufacture, facilitates automated production, and helps reduce the production cost of hairpin coils.

[0051] like Figure 5 and Figure 6 As shown, the voltage leads and neutral point leads of the three-phase stator windings are both connected in a star or delta configuration.

[0052] Each parallel branch has a hairpin coil including a U-shaped hairpin coil 20 and an I-shaped hairpin coil. The I-shaped hairpin coil is located at the input and output ends of each parallel branch, and the U-shaped hairpin coil 20 is located between the I-shaped hairpin coils at both ends. That is, each parallel branch contains only two I-shaped hairpin coils, and the rest are U-shaped hairpin coils 20.

[0053] like Figure 3 As shown, the U-shaped hairpin coil 20 is formed by a flat wire conductor with a rectangular cross-section, including a bent connecting section 21, two straight sections 22, and two welded sections 23. The two straight sections 22 are used to be inserted into two different stator slots 13 respectively. Both the bent connecting section 21 and the welded sections 23 protrude from the outer side of the end face of the stator core 11. The two ends of the bent connecting section 21 are respectively connected to the same end of the two straight sections 22, and the same end of the two welded sections 23 are respectively connected to the other end of the two straight sections 22. This can eliminate the potential phase difference caused by the position of multiple parallel branches in each phase winding in the stator slot 13.

[0054] by Figure 3 From the perspective shown, the two ends of the bent connecting section 21 are respectively connected to the top ends of the two straight sections 22, and the top ends of the two welded sections 23 are respectively connected to the bottom ends of the two straight sections 22. All bent connecting sections 21 of the U-shaped hairpin coils 20 are located at one end of the stator core 11, forming the winding insertion end. All welded sections 23 of the U-shaped hairpin coils 20 are located at the other end of the stator core 11. Adjacent welded sections 23 of adjacent U-shaped hairpin coils 20 are welded together to form the winding welding end. For example, the bottom end of the right welded section 23 of the left U-shaped hairpin coil 20 is welded to the bottom end of the left welded section 23 of the right U-shaped hairpin coil 20 through a welding connecting wire. The span refers to the number of stator slots 13 crossed by the two straight sections 22 of the U-shaped hairpin coil 20; the welding pitch between hairpin coils is the number of stator slots crossed by the adjacent straight sections 22 of two adjacent hairpin coils.

[0055] The type I hairpin coil is equivalent to half the size of the type U hairpin coil (20). Figure 3 From the perspective shown, the type I hairpin coil is equivalent to the left or right half of the type U hairpin coil 20, and its structure will not be described in detail.

[0056] In some embodiments of this application, the U-shaped hairpin coil 20 can be inserted into the stator slot 13 and then the U-shaped hairpin coil 20 can be bent to form a welding section 23. After the U-shaped hairpin coil 20 is inserted into the stator slot 13, its bent connecting section 21 forms the winding insertion end, and the welding section 23 forms the winding welding end.

[0057] In some embodiments of this application, when a=2, the span combinations of the outermost and innermost hairpin coils in the same layer of the two parallel branches are (Z / P+1), Z / P, and (Z / P-1), i.e., 7, 6, and 5, and the ratio of the number of hairpin coils in the same layer with the three spans is 1:5:1. Therefore, fewer types of hairpin coil spans in the same layer result in fewer types of hairpin coil wires used, facilitating motor winding and automated production.

[0058] Specifically, such as Figures 8 to 11 As shown, in the first parallel branch of phase A winding, the number of hairpin coils with a span of 7 in the outermost and innermost layers is 1, the number of hairpin coils with a span of 6 in the outermost layer is 5, and the number of hairpin coils with a span of 5 in the outermost layer is 1, that is, the ratio of the number is 1:5:1.

[0059] In some embodiments of this application, when a=2, the voltage leads of the two parallel branches are respectively led out from the same slot layer of two adjacent slots in the same adjacent combined slot, and the neutral point leads are also respectively led out from the same slot layer of two adjacent slots in the same adjacent combined slot, and the same slot layer is the outermost or innermost layer of the stator slot; the voltage leads and neutral point leads of each parallel branch are separated by Z / P stator slots, thereby facilitating winding.

[0060] Specifically, such as Figures 6 to 13 As shown, the voltage lead A1 of the first parallel branch of phase A winding is led out from the first slot layer of the first slot of the first adjacent combination slot, and the voltage lead A2 of the second parallel branch is led out from the first slot layer of the second slot of the first adjacent combination slot; the neutral point lead X1 of the first parallel branch of phase A winding is led out from the first slot layer of the seventh slot of the second adjacent combination slot, and the neutral point lead X2 of the second parallel branch is led out from the first slot layer of the seventh slot of the second adjacent combination slot. It is led out from the first layer of the eighth slot of the second adjacent combined slot; the voltage lead A1 of the first parallel branch of the A phase winding and its neutral point lead X1 are separated by 6 stator slots, and the voltage lead A2 of the second parallel branch of the A phase winding and its neutral point lead X2 are separated by 6 stator slots, all of which meet the requirement that "the voltage lead and the neutral point lead of each parallel branch are separated by Z / P (i.e., 48 / 8) stator slots".

[0061] The following embodiments use an example where the motor has 8 poles P, 48 stator slots Z, each stator slot 13 contains 8 slot layers, and each phase winding of the three-phase stator winding 12 includes 2 parallel branches to illustrate the winding structure of each phase winding of the motor of the present invention.

[0062] The U-shaped hairpin coil 20 of the stator assembly 10 in this embodiment has only three spans: (Z / P+1), (Z / P-1), and Z / P, i.e., 7, 6, and 5. The stator assembly 10 is composed of three-phase stator windings 12 (A-phase winding, B-phase winding, and C-phase winding) with a phase difference of 120 electrical degrees, and the three-phase stator windings 12 are wound in the stator core 11.

[0063] Slot number i(j) represents the j-th slot layer in slot i. For example, 1(1) represents the 1st slot layer in slot 1, or simply slot 1-1, and 7(2) represents the 2nd slot layer in slot 7, or simply slot 7-2. The other slot numbers below are explained in the same way.

[0064] like Figures 6 to 13 As shown, the horizontally arranged numbers 1 to 48 represent the slot numbers, and they are arranged in a ring. Figure 2 As shown; the vertically arranged numbers 1 to 8 represent slot layers, with a total of 8 slot layers. A1 and A2 can be used as voltage leads for phase A or as neutral point leads. Correspondingly, X1 and X2 can be used as voltage leads or as neutral point leads. For example, A1 can be used as the voltage lead for the first parallel branch of the phase A winding, and X1 can be used as the neutral point lead for the first parallel branch of the phase A winding; A2 can be used as the voltage lead for the second parallel branch of the phase A winding, and X2 can be used as the neutral point lead for the second parallel branch of the phase A winding.

[0065] Similarly, B1 and B2 can be used as voltage leads or neutral point leads for the B-phase winding. Correspondingly, Y1 and Y2 can be used as voltage leads or neutral point leads. For example, B1 can be used as the voltage lead for the first parallel branch of the B-phase winding, and Y1 can be used as the neutral point lead for the first parallel branch of the B-phase winding; B2 can be used as the voltage lead for the second parallel branch of the B-phase winding, and Y2 can be used as the neutral point lead for the second parallel branch of the B-phase winding.

[0066] C1 and C2 can be used as voltage leads or neutral point leads for the C-phase winding. Similarly, Z1 and Z2 can be used as voltage leads or neutral point leads. For example, C1 can be used as the voltage lead for the first parallel branch of the C-phase winding, and Z1 can be used as the neutral point lead for the first parallel branch of the C-phase winding; C2 can be used as the voltage lead for the second parallel branch of the C-phase winding, and Z2 can be used as the neutral point lead for the second parallel branch of the C-phase winding.

[0067] like Figure 8 and Figure 9 As shown, the first parallel branch of phase A winding enters at position A1 (slot 1, layer 1) and exits at position X1 (slot 7, layer 1) to the three-phase center point. The slot numbers traversed by the first parallel branch in series are:

[0068] 1(1)-7(2)-13(3)-19(4)-25(5)-31(6)-37(7)-43(8)-38(8)-32(7)-26(6)-20(5)-14(4)-8(3)-2(2)-44(1)-38(1)-44(2)-2(3)-8(4)-14(5)-20(6)-26(7)-32(8)-26(8)-20(7)-14(6)-8(5)-2(4)-44(3)-38(2)-32(1)- 26(1)-32(2)-38(3)-44(4)-2(5)-8(6)-14(7)-20(8)-13(8)-7(7)-1(6)-43(5)-37(4)-31(3)-25(2)-19(1)-13(1)-19(2)-25(3)-31(4)-37(5)-43(6)-1(7)-7(8)-1(8)-43(7)-37(6)-31(5)-25(4)-19(3)-13(2)-7(1).

[0069] like Figure 10 and Figure 11 As shown, the second parallel branch of phase A winding enters at position A2 (slot 2, layer 1) and exits at position X2 (slot 8, layer 1) to the three-phase center point. The slot numbers traversed by the second parallel branch in series are:

[0070] 2(1)-8(2)-14(3)-20(4)-26(5)-32(6)-38(7)-44(8)-37(8)-31(7)-25(6)-19(5)-13(4)-7(3)-1(2)-43(1)-37(1)-43(2)-1(3)-7(4)-13(5)-19(6)-25(7)-31(8)-25(8)-19(7)-13(6)-7(5)-1(4)-43(3)-37(2)-31(1)- 25(1)-31(2)-37(3)-43(4)-1(5)-7(6)-13(7)-19(8)-14(8)-8(7)-2(6)-44(5)-38(4)-32(3)-26(2)-20(1)-14(1)-20(2)-26(3)-32(4)-38(5)-44(6)-2(7)-8(8)-2(8)-44(7)-38(6)-32(5)-26(4)-20(3)-14(2)-8(1).

[0071] The starting and ending slot numbers of the two parallel branch windings are distributed as follows: A1 corresponds to 1 (1), X1 corresponds to 7 (1); A2 corresponds to 2 (1), X2 corresponds to 8 (1); the span of the cross-layer hairpin coil of the two parallel branch windings is 6, the span of the hairpin coil of the same layer is 5, 6, 7, and the span of the hairpin coil of the welded end is 6; the type and number of coil spans of the two branch windings are exactly the same, so the resistance of the two branch windings is exactly the same, the circumference is completely symmetrical, and there is no potential difference causing the branch circulating current.

[0072] Phase A winding, phase B winding, and phase C winding are symmetrically and evenly distributed on the circumference of stator core 11, such as... Figure 14 and Figure 15 As shown, the winding methods of phase B and phase C will not be described in detail here.

[0073] This embodiment also proposes a vehicle that includes the aforementioned motor.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A stator assembly, characterized in that, include: The stator core has Z stator slots evenly distributed circumferentially on its inner wall, and each stator slot is divided into 8 slot layers along the radial direction of the stator core; The three-phase stator winding is wound around the stator core and symmetrically distributed circumferentially along the stator core. Each phase of the three-phase stator winding includes two parallel branches, which are rotationally symmetrical about the circumference of the stator core. Each parallel branch contains multiple hairpin coils with different spans. Each stator slot has eight layers of hairpin coils, and the hairpin coils of the parallel branch traverse eight slot layers in different stator slots. Each parallel branch has P adjacent combination slots, where P is the number of poles of the motor, and the number of slots in each adjacent combination slot is q, where q = Z / 3P. The number of tank layers occupied by each combined tank is different, and the number of tank layers occupied by each tank in each adjacent combined tank is 4; the tank layers occupied by q tanks in P / 4 adjacent combined tanks are all arranged adjacently; at least one tank in P / 2 adjacent combined tanks is divided into two groups, one group occupies 1 tank layer and the other group occupies 3 tank layers, with a gap of 4 tank layers between the two groups; at least one tank in P / 4 adjacent combined tanks is divided into two groups, both groups occupy 2 tank layers, with a gap of 4 tank layers between the two groups; at least one tank in P adjacent combined tanks is arranged adjacently.

2. The stator assembly according to claim 1, characterized in that, The outermost or innermost layer of the two parallel branches has the same layer hairpin coil span combination of (Z / P+1), Z / P, (Z / P-1), and the ratio of the number of same layer hairpin coils of the three spans is 1:5:

1.

3. The stator assembly according to claim 1, characterized in that, The voltage leads of the two parallel branches are respectively led out from the same layer of two adjacent slots in the same adjacent combined slot, and the neutral point leads are also respectively led out from the same layer of two adjacent slots in the same adjacent combined slot, and the same layer is the outermost or innermost layer of the stator slot; the voltage leads and neutral point leads of each parallel branch are separated by Z / P stator slots.

4. The stator assembly according to claim 1, characterized in that, The hairpin coil includes two straight segments and a bent segment and a welded segment connecting the two straight segments.

5. The stator assembly according to claim 1, characterized in that, The voltage leads and neutral point leads of the three-phase stator windings are both connected in a star or delta configuration.

6. An electric motor, comprising a rotor and a stator assembly, characterized in that, The stator assembly is the stator assembly according to any one of claims 1 to 5.

7. A vehicle, characterized in that, Includes the motor described in claim 6.

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