Stator assembly, motor and vehicle

Abstract

The utility model provides a stator assembly, a motor and a vehicle. The stator assembly comprises a stator core and a three-phase stator winding. The stator core is provided with Z stator slots, and each stator slot is divided into 6 slot layers along the radial direction of the stator core; any phase winding of the three-phase stator winding comprises a parallel branches, each parallel branch comprises a plurality of hairpin coils with different spans, six layers of hairpin coils are arranged in any stator slot, and the hairpin coils of the parallel branches traverse six slot layers in different stator slots; any parallel branch is provided with P adjacent combined grooves, the number of the grooves of each adjacent combined groove is 2, groove layers occupied by the adjacent combined grooves are different, and the number combination of the groove layers occupied by the adjacent combined grooves is 2, 4 or 3, 3. The magnetic field distribution of a plurality of parallel branches in each phase winding is the same, the magnetic potential is balanced, and the service life of the flat wire motor is prolonged; the cross-layer hairpin coil is few in line type, convenient to manufacture and convenient for automatic production.

Description

Stator assembly, motor and vehicle Technical Field

[0001] This utility model belongs to the field of motor technology, specifically relating to stator assemblies, motors, and vehicles including the motor. 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 winding structures with corrugated or laminated windings. By designing the flat wires in the winding structure into a multi-layered structure, the AC resistance of the motor can be effectively reduced.

[0004] However, with the increase in the number of flat wire conductors, the wiring method of the winding structure also differs. In the existing technology, when connecting the branches of each phase 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 winding structure of flat wire motors, 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

[0005] 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.

[0006] To achieve the above-mentioned technical effects, the stator assembly in this utility model adopts the following technical solution: a stator assembly comprising:

[0007] The stator core has Z stator slots evenly distributed circumferentially on its inner wall, and each stator slot is divided into 6 slot layers along the radial direction of the stator core;

[0008] The three-phase stator windings are wound around the stator core and arranged periodically along the circumference of 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 6 layers of hairpin coils, and the hairpin coils of the parallel branch traverse 6 slot layers in different stator slots. Each parallel branch has *P* adjacent combination slots, where *P* is the number of poles of the motor. Each adjacent combination slot has 2 slots, and each adjacent combination slot occupies a slot layer... The numbers are not the same, and the number of slot layers occupied by each adjacent combination slot is 2, 4 or 3, 3; when the number of slot layers occupied by adjacent combination slots is 3, 3, the slot layers occupied by the two slots of the adjacent combination slots are arranged adjacently; when the number of slot layers occupied by adjacent combination slots is 2, 4, there are P / 2 adjacent combination slots whose slot layers are arranged adjacently; when one of the slots in an adjacent combination slot occupies 4 slot layers, the slot layers in which the slot is located are arranged adjacently; when one of the slots in an adjacent combination slot occupies 2 slot layers, at least one slot whose number of slot layers is 2 has its two slot layers divided into two groups, and these two groups of slot layers are located on the outermost and innermost sides of the stator slot, respectively.

[0009] The span of the hairpin coil of any parallel branch from the j-th slot to the (j+1)-th slot is Z / P, and the welding span of any parallel branch from the j-th slot to the (j+1)-th slot is also Z / P, where j is a positive integer and j<6.

[0010] 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 leads are also respectively led out from the same layer of the two adjacent slots of the same adjacent combined slot.

[0011] The hairpin coil includes two straight segments and a bent segment and a welded segment connecting the two straight segments.

[0012] The voltage leads and neutral point leads of the three-phase stator windings are both connected in a star or delta configuration.

[0013] This utility model also proposes an electric motor, including a rotor and a stator assembly, wherein the stator assembly is the stator assembly described above.

[0014] This utility model also proposes a vehicle that includes the aforementioned motor.

[0015] Compared with the prior art, the present invention has the following advantages and positive effects:

[0016] 1. The stator assembly of this utility model has stator slots on the inner wall of the stator core divided into 6 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, and the magnetomotive force is balanced. This avoids the circulating current between parallel branches, improves the motor efficiency, avoids local overheating of the winding, and extends the life of the flat wire motor.

[0017] 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

[0018] 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 is a three-dimensional structural diagram of the stator assembly of the motor in an embodiment of this utility model;

[0020] Figure 2 is a three-dimensional structural diagram of the stator core of the stator assembly in an embodiment of this utility model;

[0021] Figure 3 is a schematic diagram of the U-shaped hairpin coil structure in an embodiment of this utility model;

[0022] Figure 4 is a circuit diagram of the three-phase stator winding of the stator assembly in the embodiment of the present invention, in which the two parallel branches of each phase winding are connected in a star configuration.

[0023] Figure 5 is a circuit diagram of the three-phase stator windings of the stator assembly in this embodiment of the present invention, in which the two parallel branches of each phase winding are connected in a delta configuration.

[0024] Figure 6 is a diagram showing the distribution of the first parallel branch slot layer of the A-phase winding of the 8-pole 48-slot motor in an embodiment of this utility model.

[0025] Figure 7 is a diagram showing the distribution of the slot layer of the second parallel branch of the A-phase winding of the 8-pole 48-slot motor in an embodiment of this utility model.

[0026] Figure 8 is a schematic diagram of the first parallel branch winding of the A phase winding of an 8-pole 48-slot motor in one embodiment of the present invention.

[0027] Figure 9 is a schematic diagram of the second parallel branch winding of the A phase winding of an 8-pole 48-slot motor in one embodiment of the present invention.

[0028] Figure 10 is a schematic diagram of the first parallel branch winding of the A phase winding of an 8-pole 48-slot motor in another embodiment of the present invention.

[0029] Figure 11 is a schematic diagram of the second parallel branch winding of the A phase winding of an 8-pole 48-slot motor in another embodiment of the present invention.

[0030] 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

[0031] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0033] For ease of understanding, the technical terms used in this application will be explained below.

[0034] Stator: refers to the stationary part of an electric motor, whose function is to generate a rotating magnetic field.

[0035] Rotor: refers to the rotating part in an electric motor, which is used to convert electrical energy into mechanical energy.

[0036] This utility model provides an electric motor, including a rotor and a stator assembly 10. The rotor is disposed within the space formed by the inner wall of the stator core 11 of the stator assembly 10. As shown in Figures 1 and 2, 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 6 slot layers along the radial direction of the stator core 11. The three-phase stator windings 12 are arranged periodically along the circumferential direction of the stator core 11. Wherein, Z is a positive integer.

[0037] Each stator slot 13 is divided into 6 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, and the sixth layer as D6. The first slot layer is the bottom layer of the stator slot 13, and the sixth slot layer is the top layer. Alternatively, the first slot layer is the top layer of the stator slot 13, and the sixth 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.

[0038] 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.

[0039] Each parallel branch contains multiple hairpin coils with different spans. Each stator slot has 6 layers of hairpin coils, and the hairpin coils of the parallel branch traverse 6 slot layers in different stator slots.

[0040] Each parallel branch has P adjacent combination slots, where P is the number of poles of the motor. That is, the number of adjacent combination slots in each parallel branch is equal to the number of poles of the motor; the number of slots in each adjacent combination slot is 2.

[0041] 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. As shown in Figures 6 and 7, for an 8-pole 48-slot motor (P=8, Z=48), slots 1 and 2 form an adjacent combination slot, slots 7 and 8 form an adjacent combination slot, slots 13 and 14 form an adjacent combination slot, slots 19 and 20 form an adjacent combination slot, slots 25 and 26 form an adjacent combination slot, slots 31 and 32 form an adjacent combination slot, slots 37 and 38 form an adjacent combination slot, and slots 43 and 44 form an adjacent combination slot, for a total of 8 adjacent combination slots, numbered from 1 to 8 from left to right. Each adjacent combination slot has 2 slots.

[0042] For any parallel branch winding, the number of slot layers occupied by each adjacent combination slot is different, and the number of slot layers occupied by the two slots in each adjacent combination slot is either 2, 4 or 3, 3. That is, in all adjacent combination slots, the number of slot layers occupied by the two slots in each adjacent combination slot is different, and the number of slot layers occupied can only be two cases: one slot occupies 2 slot layers and the other slot occupies 4 slot layers, or one slot occupies 3 slot layers and the other slot also occupies 3 slot layers.

[0043] As shown in Figure 6, in the 8 adjacent combination slots of the first parallel branch of phase A, the two slots of the first adjacent combination slot (i.e., the adjacent combination slot composed of slots 1 and 2) have the following configurations: slot 1 occupies slot layers 1 and 6, with a slot layer count of 2; slot 2 occupies slot layers 2 to 5, with a slot layer count of 4. Similarly, the two slots of the second adjacent combination slot (i.e., the adjacent combination slot composed of slots 7 and 8) have the following configurations: slot 7 occupies slot layers 1 and 2, with a slot layer count of 2; slot 8 occupies slot layers 1 to 5, with a slot layer count of 4. The first two adjacent combination of slots are: 3 to 6, with a total of 4 slot layers; the third combination (comprising slots 13 and 14) consists of two slots, with slot 13 occupying slot layers 1 to 3 (3 slot layers) and slot 14 occupying slot layers 4 to 6 (3 slot layers); the fourth combination of slots is: the fourth combination (comprising slots 19 and 20) consists of two slots, with slot 19 occupying slot layers 1 to 4 (4 slot layers) and slot 20 occupying slot layers 5 and 6. The first layer has two slot layers; the fifth adjacent combination (i.e., the combination of slots 25 and 26) has two slots, where slot 25 occupies slot layers 2 to 5, totaling 4 slot layers, and slot 26 occupies slot layers 1 and 6, totaling 2 slot layers; the sixth adjacent combination (i.e., the combination of slots 31 and 32) has two slots, where slot 31 occupies slot layers 3 to 6, totaling 4 slot layers, and slot 32 occupies slot layers 1 and 2, totaling 2 slot layers. The number is 2; the 7th (i.e., the adjacent combination of slots 37 and 38) is two slots, slot 37 occupies the 4th to 6th slot layers, the number of slot layers is 3, and slot 38 occupies the 1st to 3rd slot layers, the number of slot layers is 3; the 8th (i.e., the adjacent combination of slots 43 and 44) ​​is two slots, slot 43 occupies the 5th and 6th slot layers, the number of slot layers is 2, and slot 44 occupies the 1st to 4th slot layers, the number of slot layers is 4.

[0044] When the number of slot layers occupied by two adjacent combined slots in each parallel branch is 3, the slot layers occupied by the two adjacent combined slots are arranged adjacently, meaning that the three slot layers occupied by each slot in the adjacent combined slot are adjacent and not separated. This is illustrated by the 3rd and 7th adjacent combined slots of the first parallel branch in phase A, as described above.

[0045] When the number of adjacent combination slots in each parallel branch is 2 or 4, there are P / 2 (P=8, then P / 2=4) adjacent combination slots whose two slots occupy adjacent slot layers. That is, half of the P adjacent combination slots have two slots whose two slots occupy adjacent slot layers. This is illustrated by the 2nd, 4th, 6th, and 8th adjacent combination slots of the first parallel branch in phase A, as described above.

[0046] In two adjacent combined slots, if one of the slots occupies 4 slot layers, then the slot layers in which that slot is located are arranged adjacently; as mentioned above, the 2nd slot of the 1st adjacent combined slot of the first parallel branch of phase A, the 8th slot of the 2nd adjacent combined slot, the 19th slot of the 4th adjacent combined slot, the 25th slot of the 5th adjacent combined slot, the 31st slot of the 6th adjacent combined slot, and the 44th slot of the 8th adjacent combined slot.

[0047] When one of the slots in an adjacent combination occupies two slot layers, at least one slot occupying two slot layers has its two slot layers divided into two groups. These two groups of slot layers are located on the outermost and innermost sides of the stator slot, respectively. That is, the two slot layers of this slot occupying two slot layers are not adjacent, but divided into two groups. One group of slot layers (i.e., one slot layer) is located on the outermost side of the stator slot, and the other group of slot layers (i.e., the other slot layer) is located on the innermost side of the stator slot. As mentioned above, the first slot of the first adjacent combination slot of the first parallel branch of phase A and the 26th slot of the fifth adjacent combination slot.

[0048] The two slots in an adjacent combination of slots are arranged in adjacent slot layers, meaning that the slot layers occupied by each slot in the adjacent combination are adjacent and not separated. As shown in Figure 6, in an 8-pole 48-slot motor, the two slots in the second (i.e., the adjacent combination of slots 7 and 8), third (i.e., the adjacent combination of slots 13 and 14), fourth (i.e., the adjacent combination of slots 19 and 20), sixth (i.e., the adjacent combination of slots 31 and 32), seventh (i.e., the adjacent combination of slots 37 and 38), and eighth (i.e., the adjacent combination of slots 43 and 44) ​​of the first parallel branch of the A phase winding are arranged in adjacent slot layers. The two slots in other adjacent combinations have non-adjacent slot layers. For example, the first slot in the first adjacent combination occupies slot layers 1 and 6, and slot layers 1 and 6 are not adjacent. Another example is the 26th slot in the fifth adjacent combination.

[0049] Similarly, as shown in Figure 7, the slots of the 2nd, 3rd, 4th, 6th, 7th and 8th adjacent combined slots of the 2nd parallel branch of phase A winding are all arranged in adjacent slot layers. The slots of the other adjacent combined slots are arranged in non-adjacent slot layers, such as the 2nd slot of the 1st adjacent combined slot and the 25th slot of the 5th adjacent combined slot.

[0050] By adopting the above-mentioned slot layer distribution, each adjacent combination slot corresponds to one pole of the motor, and the N pole and S pole of the motor are arranged alternately. Therefore, the current flowing through each hairpin coil is arranged in a positive and negative alternating pattern, which facilitates winding. Moreover, there are fewer types of cross-layer hairpin coils during winding. As shown in Figures 8 to 11, there are only two types of cross-layer hairpin coils: the cross-layer hairpin coil between the 2nd and 3rd slot layers and the cross-layer hairpin coil between the 4th and 5th slot layers. This facilitates manufacturing, enables automated production, and helps reduce the production cost of hairpin coils.

[0051] As shown in Figures 4 and 5, 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] As shown in Figure 3, 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] From the perspective shown in Figure 3, 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 of the type U hairpin coil 20. From the perspective shown in Figure 3, the type I hairpin coil is equivalent to the left or right half of the type U hairpin coil 20. 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, slot number i(j) represents the j-th slot layer in the i-th slot. For example, 1(1) below represents the 1-th slot layer in the 1-th slot, or simply the 1-th slot layer, and 7(2) below represents the 2-th slot layer in the 7-th slot, or simply the 7-th slot layer. Other slot numbers below are explained in the same way.

[0058] In some embodiments of this application, the hairpin coil span from the j-th slot layer to the (j+1)-th slot layer of any parallel branch is Z / P, and the welding span of the same parallel branch from the j-th slot layer to the (j+1)-th slot layer is also Z / P, where j is a positive integer and j<6. That is, the non-same-layer hairpin coil span and non-same-layer welding span of any parallel branch are equal, resulting in fewer types of U-shaped hairpin coils and only one type of welding span, further facilitating welding and automated manufacturing.

[0059] As shown in Figures 6 and 7, for an 8-pole 48-slot motor, i.e., P=8 and Z=48, the span of the non-same-layer hairpin coil and the non-same-layer welding span are both 6.

[0060] 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 of the same adjacent combined slot, and the neutral point leads are also respectively led out from the same slot layer of two adjacent slots of the same adjacent combined slot, thereby facilitating winding.

[0061] Specifically, as shown in Figures 8 to 11, the voltage lead A1 of the first parallel branch of the A-phase winding is led out from the first slot layer of the first slot of the first adjacent combined 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 combined slot; the neutral point lead X1 of the first parallel branch of the A-phase winding is led out from the first slot layer of the 44th slot of the 8th adjacent combined slot, and the neutral point lead X2 of the second parallel branch is led out from the first slot layer of the 44th slot of the 8th adjacent combined slot.

[0062] The following embodiments use an example of a motor with 8 poles P, 48 stator slots Z, each stator slot 13 containing 6 slot layers, and each phase winding of the three-phase stator winding 12 including 2 parallel branches, to illustrate in detail the winding structure of each phase winding of the motor of this utility model.

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

[0064] As shown in Figures 8 to 11, the horizontally arranged numbers 1 to 48 represent the slot numbers, arranged in a ring, as shown in Figure 2; the vertically arranged numbers 1 to 6 represent the slot layers, with a total of 6 slot layers.

[0065] The first winding scheme, as shown in Figure 8, involves the first parallel branch of phase A winding entering at the in position (slot 1, layer 1) and exiting at the out position (slot 44, layer 1) to the three-phase center point. The slot numbers traversed by the first parallel branch in series are:

[0066] 1(1)-7(2)-13(3)-19(4)-25(5)-31(6)-37(6)-31(5)-25(4)-19(3)-13(2)-7(1)-13(1)-19(2)-25(3)-31(4)-37(5)-43(6)-1(6)-43(5)-37(4)-31(3)-25(2)-19(1 )-26(1)-32(2)-38(3)-44(4)-2(5)-8(6)-14(6)-8(5)-2(4)-44(3)-38(2)-32(1)-38(1)-44(2)-2(3)-8(4)-14(5)-20(6)-26(6)-20(5)-14(4)-8(3)-2(2)-44(1).

[0067] As shown in Figure 9, the second parallel branch of phase A winding enters at the in position (slot 2, layer 1) and exits at the out position (slot 43, layer 1) to the three-phase center point. The slot numbers traversed by the second parallel branch in series are:

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

[0069] The starting and ending slot numbers of the two parallel branch windings are distributed as follows: the starting slot number of the first parallel branch is 1 (1), and the ending slot number is 44 (1); the starting slot number of the second parallel branch is 2 (1), and the ending slot number is 43 (1); the span of the cross-layer hairpin coil of the two branch windings is 6, the span of the hairpin coil of the same layer is 6, 7 or 5, 6, and the span of the hairpin coil of the welded end is 6; the two branch windings are completely symmetrical in circumference, and there is no potential difference causing branch circulating current.

[0070] The A-phase winding, B-phase winding, and C-phase winding are symmetrically and evenly distributed on the circumference of the stator core 11, arranged in a periodic manner. The winding method of the B-phase winding and C-phase winding will not be described in detail here.

[0071] The second winding scheme, as shown in Figure 10, involves the first parallel branch of phase A winding entering at the in position (slot 1, layer 1) and exiting at the out position (slot 7, layer 1) to the three-phase center point. The slot numbers traversed by the first parallel branch in series are:

[0072] 1(1)-7(2)-13(3)-19(4)-25(5)-31(6)-26(6)-20(5)-14(4)-8(3)-2(2)-44(1)-38(1)-44(2)-2(3)-8(4)-14(5)-20(6)-14(6)-8(5)-2(4)-44(3)-38(2)-32(1)-26 (1)-32(2)-38(3)-44(4)-2(5)-8(6)-1(6)-43(5)-37(4)-31(3)-25(2)-19(1)-13(1)-19(2)-25(3)-31(4)-37(5)-43(6)-37(6)-31(5)-25(4)-19(3)-13(2)-7(1).

[0073] As shown in Figure 11, the second parallel branch of phase A winding enters at the in position (slot 2, layer 1) and exits at the out position (slot 8, layer 1) to the three-phase center point. The slot numbers traversed by the first parallel branch in series are:

[0074] 2(1)-8(2)-14(3)-20(4)-26(5)-32(6)-25(6)-19(5)-13(4)-7(3)-1(2)-43(1)-37(1)-43(2)-1(3)-7(4)-13(5)-19(6)-13(6)-7(5)-1(4)-43(3)-37(2)-31(1)-25 (1)-31(2)-37(3)-43(4)-1(5)-7(6)-2(6)-44(5)-38(4)-32(3)-26(2)-20(1)-14(1)-20(2)-26(3)-32(4)-38(5)-44(6)-38(6)-32(5)-26(4)-20(3)-14(2)-8(1).

[0075] The starting and ending slot numbers of the two parallel branch windings are distributed as follows: the starting slot number of the first parallel branch is 1 (1), and the ending slot number is 7 (1); the starting slot number of the second parallel branch is 2 (1), and the ending slot number is 8 (1); the span of the cross-layer hairpin coil of the two branch windings is 6, the span of the hairpin coil of the same layer is 5, 6, and 7, and the span of the hairpin coil of the welded end is 6; the two branch windings are completely symmetrical in circumference, and there is no potential difference causing branch circulating current.

[0076] The A-phase winding, B-phase winding, and C-phase winding are symmetrically and evenly distributed on the circumference of the stator core 11, arranged in a periodic manner. The winding method of the B-phase winding and C-phase winding will not be described in detail here.

[0077] This embodiment also proposes a vehicle that includes the aforementioned motor.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model 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. Such 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 this utility model.

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 6 slot layers along the radial direction of the stator core; a three-phase stator winding is wound in the stator core and arranged periodically along the circumference of the stator core; any phase winding 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, and each stator slot has 6 layers of hairpin coils, and the hairpin coils of the parallel branch traverse 6 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 each adjacent The number of slots in the combined slot is 2. The number of slot layers occupied by each adjacent combined slot is different, and the number of slot layers occupied by each adjacent combined slot is either 2, 4 or 3, 3. When the number of slot layers occupied by adjacent combined slots is 3, 3, the two slots of the adjacent combined slot are arranged adjacently. When the number of slot layers occupied by adjacent combined slots is 2, 4, there are P / 2 adjacent combined slots whose two slot layers are arranged adjacently. When one of the slots in an adjacent combined slot occupies 4 slot layers, the slot layers in which that slot are located are arranged adjacently. When one of the slots in an adjacent combined slot occupies 2 slot layers, at least one slot with 2 slot layers has its two slot layers divided into two groups, and these two groups of slot layers are located on the outermost and innermost sides of the stator slot, respectively.

2. The stator assembly according to claim 1, characterized in that, The span of the hairpin coil of any parallel branch from the j-th slot to the (j+1)-th slot is Z / P, and the welding span of any parallel branch from the j-th slot to the (j+1)-th slot is also Z / P, where j is a positive integer and j<6.

3. The stator assembly according to claim 1, characterized in that, 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 leads are also respectively led out from the same layer of the two adjacent slots of the same adjacent combined slot.

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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