Stator assembly, motor and vehicle

Abstract

The invention provides a stator assembly, a motor and a vehicle. The stator assembly comprises a stator core and a three-phase stator winding. Any phase winding comprises a parallel branches, a is 1 or 2, and when a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core; any parallel branch comprises a plurality of hairpin coils with different spans, the hairpin coils only comprise three spans of Z / P, (Z / P + 1) and (Z / P-1), and any phase winding comprises the hairpin coils with the three spans of Z / P, (Z / P + 1) and (Z / P-1); and only the hairpin coils of the stator winding of the same phase exist in the eight slot layers of the same stator slot. The magnetic field distribution of the parallel branches in each phase of winding is the same, the magnetic potential is balanced, circulation among the parallel branches is avoided, the efficiency of the flat wire motor is improved, local temperature rise over-temperature of the winding is avoided, and the service life of the flat wire motor is prolonged.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a stator assembly, a motor and a vehicle. Background Art

[0002] With the promotion of new energy vehicles, new energy electric vehicles are becoming more and more popular, and the market demand for the performance of electric vehicle power systems is getting higher and higher. The main drive motor is one of the core components of electric vehicles, and is developing in the direction of high power density and high torque density, small size and light weight. With the development of flat wire technology, the main drive motor of electric vehicles gradually adopts flat wire winding, which can improve the slot fill rate of the stator, increase the cross-sectional area of ​​the copper conductor, reduce the size of the motor, and further improve the power density, efficiency and thermal conductivity of the motor.

[0003] In the prior art, flat wire motors mainly use a winding structure of wave winding or laminated winding. By designing the flat wire conductors in the winding structure into a multi-layer structure, the AC resistance of the motor can be effectively reduced. However, as the number of flat wire conductors increases, the wiring method of the winding structure is also different. In the prior art, when the phase branches of the stator winding are connected, the torsion direction of the outer end of the coil slot or the distance between the torsion slots is inconsistent, the hairpin coils used are of various types, the manufacturing process is complex, the forming is difficult, the production cost is high, and the processing efficiency is low. In addition, due to the complex structure of the motor winding, potential imbalance is prone to occur between the same-phase branches, resulting in the formation of circulating currents between the branches, affecting the efficiency and temperature rise of the motor. Summary of the invention

[0004] The present invention provides a stator assembly, a motor and a vehicle, which can solve the problems in the prior art that circulating current is easily generated between multiple parallel branches of the motor stator three-phase winding, and the production process is complicated and the manufacturing cost is high due to the variety of line types of hairpin coils.

[0005] In order to achieve the above technical effects, the technical solution adopted by the stator of the present invention is a stator assembly, comprising: A stator core, the inner wall of which is uniformly provided with Z stator slots along the circumferential direction, each of the stator slots being divided into 8 slot layers along the radial direction of the stator core; A three-phase stator winding is wound in the stator core and symmetrically distributed along the circumference of the stator core; any one phase of the three-phase stator winding includes a parallel branches, a is 1 or 2, and when a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core; any one parallel branch contains a plurality of hairpin coils with different spans, and the hairpin coils only contain three spans of Z / P, (Z / P+1) and (Z / P-1), and P is the motor pole number; any of the parallel branches has hairpin coils with three spans of Z / P, (Z / P+1) and (Z / P-1), and the hairpin coils with spans of (Z / P+1) and (Z / P-1) are only located in the outermost layer or the innermost layer of the stator slot; when a is 2, hairpin coils with two spans of (Z / P+1) and (Z / P-1) do not exist in each parallel branch at the same time; only hairpin coils of the stator winding of the same phase exist in the 8 slot layers of the same stator slot.

[0006] When a=2, the voltage lead wires of the two parallel branches are respectively led out from the first slot layers of two adjacent stator slots, and the neutral point lead wire is also respectively led out from the first slot layers of two adjacent stator slots; and, the voltage lead wire and the neutral point lead wire of one of the parallel branches are separated by 5 stator slots, and the voltage lead wire and the neutral point lead wire of the other parallel branch are separated by 7 stator slots.

[0007] When a=2, the span combination of the outermost and innermost card issuing coils of the same layer in one of the parallel branches is (Z / P+1) and Z / P, and the ratio of the number of card issuing coils with a span of (Z / P+1) to the number of card issuing coils with a span of Z / P is 1:6; the span combination of the outermost and innermost card issuing coils of the same layer in the other parallel branch is (Z / P-1) and Z / P, and the ratio of the number of card issuing coils with a span of (Z / P-1) to the number of card issuing coils with a span of Z / P is 1:6.

[0008] The hairpin coil span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, and the welding span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, j is a positive integer, and j<8.

[0009] The hairpin coil comprises a U-shaped hairpin coil and an I-shaped hairpin coil, wherein the U-shaped hairpin coil comprises a bent connecting section and two straight sections respectively inserted into two different stator slots and two welding sections protruding outward from the end surface of the stator core, wherein two ends of the bent connecting section are respectively connected to the same end of the two straight sections, and the same end of the two welding sections is respectively connected to the other ends of the two straight sections; the bent connecting sections of all the U-shaped hairpin coils are all located at one end of the stator core to form a winding hairpin end, and the welding sections of all the U-shaped hairpin coils are all located at the other end of the stator core, and adjacent welding sections of adjacent U-shaped hairpin coils are welded together to form a winding welding end; The span of the hairpin coil is the number of stator slots spanned by two straight line segments of the U-shaped hairpin coil.

[0010] The voltage lead wire and neutral point lead wire of any phase stator winding are connected in star or triangle.

[0011] The present invention also provides a motor, comprising a stator assembly and a rotor, wherein the stator assembly is the stator assembly described above.

[0012] The present invention also provides a vehicle, comprising the above-mentioned motor.

[0013] Compared with the prior art, the present invention has the following advantages and positive effects: 1. The stator assembly of the present invention has three-phase stator windings symmetrically distributed along the circumference of the stator core, and when any one phase winding includes two parallel branches, the two parallel branches are also rotationally symmetrical in the circumferential direction of the stator core, so that the magnetic field distribution of multiple parallel branches in each phase winding is the same, the magnetic potential is balanced, the circulating current between the parallel branches is avoided, the efficiency of the flat wire motor is improved, and the local temperature rise of the winding is avoided, thereby extending the life of the flat wire motor; 2. Any parallel branch contains multiple hairpin coils with different spans. The multiple hairpin coils only contain three spans of (Z / P+1), Z / P and (Z / P-1). Any phase winding has hairpin coils with three spans of Z / P, (Z / P+1) and (Z / P-1). When there are 2 parallel branches, any parallel branch does not have two spans of (Z / P+1) and (Z / P-1) at the same time, and the hairpin coils with spans of (Z / P+1) and (Z / P-1) are only located in the outermost or innermost layer of the stator slot. Only hairpin coils of the same phase stator winding exist in the same stator slot, which reduces the number of hairpin coil line types and facilitates automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0015] Figure 1 Schematic diagram of the three-dimensional structure of the stator assembly of the motor in an embodiment of the present invention; Figure 2 Schematic diagram of the three-dimensional structure of the stator core of the stator assembly in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a U-shaped hairpin coil in an embodiment of the present invention; Figure 4 It is a circuit diagram of two parallel branches of each phase winding in the three-phase stator winding of the stator assembly in an embodiment of the present invention connected in a star manner; Figure 5 It is a circuit diagram of two parallel branches of each phase winding in the three-phase stator winding of the stator assembly in an embodiment of the present invention connected in a triangle manner; Figure 6 It is an expanded view of the winding mode of the first parallel branch of the A-phase winding of the 8-pole 48-slot motor in the embodiment of the present invention; Figure 7 for Figure 6 Enlarged view of middle part I; Figure 8 It is an expanded view of the winding method of the second parallel branch of the A-phase winding of the 8-pole 48-slot motor in the embodiment of the present invention; Fig. 9 for Figure 8 Enlarged view of middle part II; Fig.10 It is an expanded view of the winding method of the A-phase winding of the 8-pole 48-slot motor in the embodiment of the present invention; Fig.11 for Fig.10 Enlarged view of middle part III; Fig.12 It is an expanded diagram of the winding method of the three-phase winding of the 8-pole 48-slot motor in the embodiment of the present invention; Fig.13 for Fig.12 An enlarged view of part IV; Figure 1 4 for Fig.12 Enlarged view of the V section.

[0016] Figure numerals: 10, stator assembly; 11, stator core; 12, three-phase stator winding; 13, stator slot; 20, U-shaped hairpin coil; 21, bent connecting section; 22, straight section; 23, welding section. DETAILED DESCRIPTION

[0017] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] In addition, 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.

[0019] For ease of understanding, the professional terms appearing in this application are explained below.

[0020] Stator: refers to the stationary part of the motor, whose function is to generate a rotating magnetic field.

[0021] Rotor: refers to the rotating part in the motor, which is used to realize the conversion of electrical energy into mechanical energy.

[0022] The embodiment of the present invention provides a motor, including a rotor and a stator assembly 10, wherein the rotor is disposed in a space enclosed by the inner wall of a 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 a three-phase stator winding 12 wound in the stator core 11. Z stator slots 13 are evenly arranged on the inner wall of the stator core 11 along the circumferential direction. Each stator slot 13 is evenly divided into 8 slot layers along the radial direction of the stator core 11. The three-phase stator winding 12 is symmetrically distributed along the circumferential direction of the stator core 11. Wherein, Z is a positive integer.

[0023] like Figure 4 and Figure 5 As shown, the voltage lead wires and neutral point lead wires of the three-phase stator winding are both connected in star or triangle.

[0024] Each stator slot 13 is evenly divided into 8 slot layers along the radial direction of the stator core 11, the first layer can be recorded 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 slot bottom layer of the stator slot 13, and the eighth slot layer is the slot opening layer, or the first slot layer is the slot opening layer of the stator slot 13, and the eighth slot layer is the slot bottom layer, the slot opening layer is also called the innermost layer, and the slot bottom layer is also called the outermost layer.

[0025] Any one phase winding of the three-phase stator winding 12 (A phase winding, B phase winding and C phase winding) includes a parallel branches, a is 1 or 2, and when a is 2, the two parallel branches of each phase winding are also rotationally symmetrical in the circumferential direction of the stator core 11; by limiting the two parallel branches in each phase winding to be rotationally symmetrical in the circumferential direction, the magnetic field distribution of the two parallel branches in each phase winding is made the same, the magnetic potential is balanced, and the circulating current between the parallel branches is avoided, thereby greatly reducing the additional AC copper loss under high-speed conditions, improving the efficiency of the flat wire motor, avoiding local temperature rise of the winding and overheating, and extending the life of the flat wire motor.

[0026] At the same time, any parallel branch contains multiple hairpin coils with different spans. All hairpin coils have only three spans of Z / P, (Z / P+1) and (Z / P-1). P is the number of motor poles, and any phase winding has three span hairpin coils of Z / P, (Z / P+1) and (Z / P-1). When it contains 2 parallel branches, any parallel branch does not have two spans of (Z / P+1) and (Z / P-1) at the same time, and the span The hairpin coils with the spans of (Z / P+1) and (Z / P-1) are only located in the outermost or innermost layer of the stator slot 13; when a is 2, hairpin coils with the spans of (Z / P+1) and (Z / P-1) do not exist simultaneously in each parallel branch; in the eight slot layers of the same stator slot 13, there are only hairpin coils of the stator winding of the same phase, which reduces the number of linear types of the hairpin coils, is conducive to simplifying the manufacturing process, reducing production costs, and facilitating automated production.

[0027] Among them, the hairpin coils of each parallel branch include a U-shaped hairpin coil 20 and an I-shaped hairpin coil. The I-shaped hairpin coil is the input end and the output end of each parallel branch. 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.

[0028] like Figure 3 As shown, the U-shaped hairpin coil 20 is formed by a flat wire conductor, the cross-section of the flat wire conductor is rectangular, including a bent connecting section 21, two straight sections 22 and two welding sections 23. The two straight sections 22 are used to be inserted into two different stator slots 13 respectively. The bent connecting section 21 and the welding section 23 both protrude from the outer side of the end surface 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 ends of the two welding sections 23 are respectively connected to the other ends of the two straight sections 22, thereby eliminating the potential phase difference caused by the positions of multiple parallel branches in each phase winding in the stator slot 13.

[0029] by Figure 3From the perspective shown, the two ends of the bent connecting segment 21 are respectively connected to the top ends of the two straight segments 22, and the top ends of the two welding segments 23 are respectively connected to the bottom ends of the two straight segments 22. The bent connecting segments 21 of all U-shaped hairpin coils 20 are all located at one end of the stator core 11 to form the winding plug-in end, and the welding segments 23 of all U-shaped hairpin coils 20 are all located at the other end of the stator core 11. The adjacent welding segments 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 welding segment 23 of the left U-shaped hairpin coil 20 is welded together with the bottom end of the left welding segment 23 of the right U-shaped hairpin coil 20. The span refers to the number of stator slots 13 spanned by the two straight segments 22 of the U-shaped hairpin coil 20; the welding pitch between the hairpin coils is the number of stator slots spanned by the adjacent straight segments 22 of two adjacent hairpin coils.

[0030] The I-type hairpin coil is equivalent to half of the U-type hairpin coil 20. Figure 3 From the perspective shown, the I-shaped hairpin coil is equivalent to the left half or the right half of the U-shaped hairpin coil 20, and its structure will not be described in detail.

[0031] In some embodiments of the present application, the U-shaped hairpin coil 20 can be inserted into the stator slot 13 and then bent to form a welding section 23, wherein after the U-shaped hairpin coil 20 is inserted into the stator slot 13, the bent connecting section 21 forms a winding wire insertion end, and the welding section 23 forms a winding welding end.

[0032] Further, when a=2, the voltage lead wires of the two parallel branches are respectively led out from the first slot layer of two adjacent stator slots, that is, the voltage lead wire of one of the parallel branches is led out from the first slot layer of one of the two adjacent stator slots, and the voltage lead wire of the other parallel branch is led out from the first slot layer of the other of the two adjacent stator slots; the neutral point lead wires of the two parallel branches are also respectively led out from the first slot layer of two adjacent stator slots, that is, the neutral point lead wire of one of the parallel branches is led out from the first slot layer of one of the two adjacent stator slots, and the neutral point lead wire of the other parallel branch is led out from the first slot layer of the other of the two adjacent stator slots; among the two parallel branches, the voltage lead wire and the neutral point lead wire of one of the parallel branches are separated by 5 stator slots, and the voltage lead wire and the neutral point lead wire of the other parallel branch are separated by 7 stator slots.

[0033] The above winding method is adopted to facilitate the welding of the motor terminals and the busbar, and the winding method of each parallel branch is simple, thereby facilitating winding, simplifying the manufacturing process, reducing production costs, and facilitating automated production.

[0034] The following embodiments take the case where the number of motor poles P is 8, the number of stator slots 13 Z is 48, each stator slot 13 contains 8 slot layers, and each phase winding in the three-phase stator winding 12 includes 2 parallel branches as an example to explain in detail the winding structure of each phase winding of the stator of the present invention.

[0035] The U-shaped hairpin coil 20 of the stator assembly 10 of this embodiment has only three spans of (Z / P+1), (Z / P-1), and Z / P, i.e., 7, 6, and 5. The stator assembly 10 is composed of a three-phase stator winding 12 (A phase winding, B phase winding, and C phase winding) with a phase difference of 120 electrical degrees, and the three-phase stator winding 12 is wound in the stator core 11.

[0036] like Figures 6 to 14 As shown, combined with Figure 2 , the numbers 1 to 48 arranged horizontally represent the slot numbers of the stator slots 13, which are arranged in a circle in a ring; Figures 6 to 14 The 8 vertical lines corresponding to the numbers 1 to 48 represent slot layers 1 to 8, with a total of 8 slot layers. A1 and A2 can be used as voltage lead wires or neutral point lead wires, and correspondingly, X1 and X2 can be used as voltage lead wires or neutral point lead wires. For example, A1 is used as the voltage lead wire of the first parallel branch of the A-phase winding, and X1 is used as the neutral point lead wire of the first parallel branch of the A-phase winding; A2 is used as the voltage lead wire of the second parallel branch of the A-phase winding, and X2 is used as the neutral point lead wire of the second parallel branch of the A-phase winding.

[0037] Similarly, B1 and B2 can be used as voltage lead wires or neutral point lead wires of the B-phase winding. Correspondingly, Y1 and Y2 can be used as voltage lead wires or neutral point lead wires. For example, B1 is used as the voltage lead wire of the first parallel branch of the B-phase winding, and Y1 is used as the neutral point lead wire of the first parallel branch of the B-phase winding; B2 is used as the voltage lead wire of the second parallel branch of the B-phase winding, and Y2 is used as the neutral point lead wire of the second parallel branch of the B-phase winding.

[0038] C1 and C2 can be used as voltage lead wires or neutral point lead wires of the C-phase winding. Correspondingly, Z1 and Z2 can be used as voltage lead wires or neutral point lead wires. For example, C1 is used as the voltage lead wire of the first parallel branch of the C-phase winding, and Z1 is used as the neutral point lead wire of the first parallel branch of the C-phase winding; C2 is used as the voltage lead wire of the second parallel branch of the C-phase winding, and Z2 is used as the neutral point lead wire of the second parallel branch of the C-phase winding.

[0039] Specifically, Figures 6 to 14As shown, the voltage lead wire A1 of the first parallel branch of the A-phase winding is led out from the first slot layer of the first slot, and the voltage lead wire A2 of the second parallel branch is led out from the first slot layer of the second slot; the neutral point lead wire X1 of the first parallel branch of the A-phase winding is led out from the first slot layer of the 44th slot, and the neutral point lead wire X2 of the second parallel branch is led out from the first slot layer of the 43rd slot; the voltage lead wire A1 and the neutral point lead wire X1 of the first parallel branch of the A-phase winding are separated by 5 stator slots, namely the 44th slot, the 45th slot, the 46th slot, the 47th slot, the 48th slot, and the 1st slot, among which the 44th slot and the 1st slot are respectively used as the lead slots of A1 and X1, so when calculating the number of stator slots separated, The 44th slot and the 1st slot can be respectively equivalent to spanning half a slot, so the voltage lead wire A1 and the neutral point lead wire X1 of the 1st parallel branch of the A-phase winding are separated by 5 stator slots; the voltage lead wire A2 and the neutral point lead wire X2 of the second parallel branch of the A-phase winding are separated by 7 stator slots, namely the 43rd slot, the 44th slot, the 45th slot, the 46th slot, the 47th slot, the 48th slot, the 1st slot, and the 2nd slot, among which since the 43rd slot and the 2nd slot are respectively used as the lead slots of A2 and X2, when calculating the number of separated stator slots, the 43rd slot and the 2nd slot can be respectively equivalent to spanning half a slot, then the voltage lead wire A2 and the neutral point lead wire X2 of the second parallel branch of the A-phase winding are separated by 7 stator slots.

[0040] In some embodiments of the present application, when a=2, the span combination of the outermost and innermost hairpin coils of the same layer in one parallel branch is (Z / P+1) and Z / P, and the ratio of the number of hairpin coils with a span of (Z / P+1) to the number of hairpin coils with a span of Z / P is 1:6; the span combination of the outermost and innermost hairpin coils of the same layer in another parallel branch is (Z / P-1) and Z / P, and the ratio of the number of hairpin coils with a span of (Z / P-1) to the number of hairpin coils with a span of Z / P is 1:6. There are fewer types of spans of hairpin coils of the same layer, and fewer types of hairpin coil line types are used accordingly, which is convenient for motor winding and automated production.

[0041] Specifically, Figures 6 to 9 Taking the motor with 8 poles P and 48 stator slots 13 Z as an example, Z / P+1=7, Z / P=6, and Z / P-1=5. The span combination of the outermost and innermost layers in the first parallel branch of the A-phase winding is 7 and 6, that is, the spans of the outermost and innermost layers in the first parallel branch are only 7 and 6, and the number of the same-layer hairpin coils with a span of 7 is 1, and the number of the same-layer hairpin coils with a span of 6 is 6, and the ratio of the number is 1:6. The span combination of the outermost and innermost layers in the second parallel branch of the A-phase winding is 5 and 6, that is, the spans of the outermost and innermost layers in the second parallel branch are only 5 and 6, and the number of the same-layer hairpin coils with a span of 5 is 1, and the number of the same-layer hairpin coils with a span of 6 is 6, and the ratio of the number is 1:6.

[0042] In some embodiments of the present application, slot number i(j) represents the jth slot layer in the i-th slot. For example, 1(1) below represents the 1st slot layer in the 1st slot, referred to as slot 1st slot layer, and 7(2) represents the 2nd slot layer in the 7th slot, referred to as slot 7th slot layer. The same applies to the other slot numbers below.

[0043] In some embodiments of the present application, the hairpin coil span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, and the welding span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, j is a positive integer, and j<8. That is, the hairpin coil spans of any parallel branch at different layers and the welding spans of different layers are equal, so that the U-shaped hairpin coil 20 has fewer types of lines and only one welding span, which is further convenient for welding and automated manufacturing.

[0044] like Figure 6 and Figure 7 As shown, the first parallel branch of phase A goes in from position A1 (slot 1, slot 1), and finally goes out from position X1 (slot 44, slot 1) to the center point of the three phases. The slot numbers through which the first parallel branch is connected in series are: 1(1)-7(2)-13(3)-19(4)-25(5)-31(6)-37(7)-43(8)-1(8)-43(7)-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(7)-7(8)-13(8)-7(7)-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(7)-20(8)-26(8)-20(7)-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(7)-32(8)-38(8)-32(7)-26(6)-20(5)-14(4)-8(3)-2(2)-44(1).

[0045] like Figure 8 and Fig. 9 As shown, the second parallel branch of the A-phase winding is wound in from the A2 position (the 2nd slot, the 1st slot layer), and finally leads out from the X2 position (the 43rd slot, the 1st slot layer) to the three-phase center point. The slot numbers through which the second parallel branch is connected in series are: 2(1)-8(2)-14(3)-20(4)-26(5)-32(6)-38(7)-44(8)-2(8)-44(7)-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(7)-8(8)-14(8)-8(7)-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(7)-19(8)-25(8)-19(7)-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(7)-31(8)-37(8)-31(7)-25(6)-19(5)-13(4)-7(3)-1(2)-43(1).

[0046] The starting slot numbers and ending slot numbers corresponding to the two parallel branch windings are distributed as follows: A1 corresponds to 1 (1), X1 corresponds to 44 (1); A2 corresponds to 2 (1), X2 corresponds to 43 (1); the span of the cross-layer hairpin coils of the two branch windings is 6, the span of the hairpin coils on the same layer is 6, 7 or 5, 6, and the span of the hairpin coils at the welding end is 6; the two branch windings are completely symmetrical in circumference, and there is no potential difference to cause branch circulation.

[0047] The A-phase winding, the B-phase winding and the C-phase winding are symmetrically and evenly distributed on the circumference of the stator core 11 , and the winding method of the B-phase winding and the C-phase winding will not be described in detail here.

[0048] Preferably, the three-phase voltage lead wires of the A-phase winding, the B-phase winding and the C-phase winding are led out at the same slot layer, which is convenient for welding the copper busbars of the terminal blocks.

[0049] Preferably, if Figure 12 to Figure 14 As shown, the neutral point lead wires X1, X2, Y1, Y2, Z1, and Z2 of the 6 parallel branches of the A-phase winding, the B-phase winding, and the C-phase winding only span 9 slots, namely the 43rd slot, the 44th slot, the 45th slot, the 46th slot, the 47th slot, the 48th slot, the 1st slot, the 2nd slot, the 3rd slot, and the 4th slot. Among them, since the 43rd slot and the 4th slot are the beginning and the end of the slots spanned by the neutral point lead wires X1, X2, Y1, Y2, Z1, and Z2, the 43rd slot and the 4th slot can be equivalent to spanning half a slot respectively, and a total of 9 slots are spanned, and the length of the star point copper bar can be greatly reduced, which is beneficial to saving resources and reducing costs, and effectively reduces the resistance of the star point copper bar, reduces heat, and improves motor efficiency.

[0050] This embodiment also proposes a vehicle, including the above-mentioned motor, which will not be described in detail here.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions 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: A stator core, the inner wall of which is uniformly provided with Z stator slots along the circumferential direction, each of the stator slots being divided into 8 slot layers along the radial direction of the stator core; A three-phase stator winding is wound in the stator core and symmetrically distributed along the circumference of the stator core; any one phase of the three-phase stator winding includes a parallel branches, a is 1 or 2, and when a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core; any one parallel branch contains a plurality of hairpin coils with different spans, and the hairpin coils only contain three spans of Z / P, (Z / P+1) and (Z / P-1), and P is the motor The number of poles; any one phase winding has three kinds of hairpin coils with spans of Z / P, (Z / P+1) and (Z / P-1), and the hairpin coils with spans of (Z / P+1) and (Z / P-1) are only located in the outermost layer or the innermost layer of the stator slot; when a is 2, hairpin coils with spans of (Z / P+1) and (Z / P-1) do not exist in each parallel branch at the same time; only hairpin coils of the stator winding of the same phase exist in the 8 slot layers of the same stator slot.

2. The stator assembly according to claim 1, characterized in that When a=2, the voltage lead wires of the two parallel branches are respectively led out from the first slot layers of two adjacent stator slots, and the neutral point lead wire is also respectively led out from the first slot layers of two adjacent stator slots; and, the voltage lead wire and the neutral point lead wire of one of the parallel branches are separated by 5 stator slots, and the voltage lead wire and the neutral point lead wire of the other parallel branch are separated by 7 stator slots.

3. The stator assembly according to claim 1, characterized in that: When a=2, the span combination of the outermost and innermost card issuing coils of the same layer in one of the parallel branches is (Z / P+1) and Z / P, and the ratio of the number of card issuing coils with a span of (Z / P+1) to the number of card issuing coils with a span of Z / P is 1:6; the span combination of the outermost and innermost card issuing coils of the same layer in the other parallel branch is (Z / P-1) and Z / P, and the ratio of the number of card issuing coils with a span of (Z / P-1) to the number of card issuing coils with a span of Z / P is 1:

6.

4. The stator assembly according to any one of claims 1 to 3, characterized in that: The hairpin coil span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, and the welding span of any parallel branch from the jth slot layer to the (j+1)th slot layer is Z / P, j is a positive integer, and j<8.

5. The stator assembly according to claim 1, characterized in that The hairpin coil comprises a U-shaped hairpin coil and an I-shaped hairpin coil, wherein the U-shaped hairpin coil comprises a bent connecting section and two straight sections respectively inserted into two different stator slots and two welding sections protruding outward from the end surface of the stator core, wherein two ends of the bent connecting section are respectively connected to the same end of the two straight sections, and the same end of the two welding sections is respectively connected to the other ends of the two straight sections; the bent connecting sections of all the U-shaped hairpin coils are all located at one end of the stator core to form a winding hairpin end, and the welding sections of all the U-shaped hairpin coils are all located at the other end of the stator core, and adjacent welding sections of adjacent U-shaped hairpin coils are welded together to form a winding welding end; The span of the hairpin coil is the number of stator slots spanned by two straight line segments of the U-shaped hairpin coil.

6. A stator assembly according to claim 1, characterized in that: The voltage lead wire and neutral point lead wire of any phase stator winding are connected in star or triangle.

7. A motor, comprising a stator assembly and a rotor, characterized in that: The stator assembly is the stator assembly according to any one of claims 1 to 6.

8. A vehicle, characterized in that: Comprising the motor described in claim 7.

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