Motor and vehicle

Abstract

The invention provides a motor and a vehicle, a stator assembly comprises a stator core and a three-phase stator winding, any phase winding of the three-phase stator winding comprises a parallel branches, any parallel branch has P adjacent combined slots, the slot number of each adjacent combined slot is q, q is equal to Z / P / 3, slot layers occupied by each adjacent combined slot are different, and a is equal to Z / P / 3. The number of groove layers occupied by each groove in each adjacent combined groove is N / 2; groove layers occupied by q grooves of at least one adjacent combined groove are arranged adjacently, groove layers occupied by at least one groove in the other adjacent combined grooves are divided into two spaced groups, the number of the groove layers occupied by one group is 1, the number of the groove layers occupied by the other group is 2, and (N-3) groove layers are arranged between the two groups of groove layers. The problems that in the prior art, circulation is likely to be generated among a plurality of parallel branches of a three-phase winding of a motor stator, and the production process is complex and the manufacturing cost is high due to the fact that the wire types of hairpin coils are multiple can be solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of motors, and in particular relates to a motor and a vehicle comprising the motor. 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 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 present invention is a motor, including a rotor and a stator assembly, wherein the stator assembly includes: 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 N slot layers along the radial direction of the stator core; A three-phase stator winding is wound in the stator core and is arranged rotationally symmetrically along the circumferential direction of the stator core; any one phase winding of the three-phase stator winding includes a parallel branches, a is 1 or 2, and each of the parallel branches contains a plurality of hairpin coils with different spans; when a is 1, N layers of the hairpin coils are arranged in any stator slot, and the hairpin coils of the parallel branches traverse N slot layers in different stator slots; when a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core, N layers of the hairpin coils are arranged in any stator slot, and each of the parallel branches traverses N slot layers. The hairpin coil of the circuit traverses N / 2 slot layers in different stator slots; any of the parallel branches has P adjacent combination slots, P is the number of poles of the motor, the number of slots of each adjacent combination slot is q, q=Z / P / 3, the slot layers occupied by each adjacent combination slot are different, and the number of slot layers occupied by each slot in each adjacent combination slot is N / 2; the slot layers occupied by q slots of at least one adjacent combination slot are arranged adjacently, and the slot layers occupied by at least one slot of the remaining adjacent combination slots are divided into two interval groups, one of which occupies 1 slot layer, and the other group occupies 2 slot layers, and the two groups of slot layers are separated by (N-3) slot layers.

[0006] The technical solution of the present invention also includes the following additional technical features: Among the P adjacent combined slots, the slot layers occupied by the q slots of 2 adjacent combined slots are arranged adjacently.

[0007] When the slot layer occupied by only one slot in the adjacent combined slots is divided into two groups, the slot is located at the outermost side of the adjacent combined slots.

[0008] When there are two grooves in adjacent combined grooves and the groove layers occupied by them are divided into two groups, the two grooves are arranged adjacent to each other.

[0009] The span of the hairpin coils on the same layer in the outermost layer or the innermost layer of any of the parallel branch windings is (Z / P-1) or (Z / P-2).

[0010] The hairpin coil span of any parallel branch from the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any parallel branch from the 1st slot layer to the Nth slot layer is Z / P.

[0011] The voltage lead-out line and the neutral point lead-out line of any parallel branch are (Z / P+2) slots apart, and the voltage lead-out line and the neutral point lead-out line are led out at the outermost slot layer or the innermost slot layer respectively.

[0012] The voltage lead wires and neutral point lead wires of the three-phase stator winding are both star-connected or delta-connected.

[0013] The present invention also provides a vehicle, comprising the above-mentioned motor.

[0014] Compared with the prior art, the present invention has the following advantages and positive effects: 1. The three-phase stator windings of the stator assembly of the motor of the present invention are 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 motor efficiency is improved, and the local temperature rise of the winding is avoided, thereby extending the life of the flat wire motor; 2. The slot layer distribution of each parallel branch makes each adjacent combination slot correspond to a pole of the motor, and the N pole and S pole of the motor are arranged alternately. Therefore, the direction of the current flowing through each hairpin coil is arranged alternately in positive and negative directions, which is convenient for winding and makes the cross-layer hairpin coil line types less, which is convenient for manufacturing and automated production. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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.

[0016] 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 Schematic diagram of slot layer distribution in the stator slot of the stator assembly in an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a U-shaped hairpin coil in an embodiment of the present invention; Figure 5 It is a circuit diagram of three 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 6 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 7 This is a slot layer distribution diagram of two parallel branches of the A-phase winding of a 6-pole 54-slot motor in an embodiment of the present invention; Figure 8 Schematic diagram of the winding method of the first parallel branch of the A-phase winding of the 6-pole 54-slot motor in an embodiment of the present invention; Fig. 9Schematic diagram of the winding method of the second parallel branch of the A-phase winding of the 6-pole 54-slot motor in an embodiment of the present invention.

[0017] 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

[0018] 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.

[0019] 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.

[0020] For ease of understanding, the professional terms appearing in this application are explained below.

[0021] Stator: refers to the stationary part of the motor, whose function is to generate a rotating magnetic field.

[0022] Rotor: refers to the rotating part in the motor, which is used to realize the conversion of electrical energy into mechanical energy.

[0023] 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 N 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 and N are natural numbers that are not 0.

[0024] As Figure 3As shown, each stator slot 13 is divided into 6 slot layers along the radial direction of the stator core 11, that is, N=6, that is, each stator slot 13 contains 6 layers of flat wire conductors, the first layer is recorded as D1, the second layer is recorded as D2, the third layer is recorded as D3, the fourth layer is recorded as D4, the fifth layer is recorded as D5, and the sixth layer is recorded as D6. The first slot layer is the slot bottom layer of the stator slot 13, and the sixth slot layer is the slot opening layer, or the first slot layer is the slot opening layer of the stator slot 13, and the sixth 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 phase winding in the three-phase stator winding 12 (phase A winding, phase B winding and phase C winding) includes a parallel branch, a is 1 or 2, and each parallel branch contains multiple hairpin coils with different spans. When a is 1, N layers of hairpin coils are provided in any stator slot, and the hairpin coils of the parallel branch traverse N slot layers in different stator slots; 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 the same, the magnetic potential is balanced, and the circulation 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, and avoiding the local temperature rise of the winding, thereby extending the life of the flat wire motor.

[0026] When a is 2, N layers of hairpin coils are arranged in any stator slot, and the hairpin coils of each parallel branch traverse N / 2 slot layers in different stator slots.

[0027] Any 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, q=Z / P / 3, where 3 is the number of phases of the three-phase stator winding. The slot layers occupied by each adjacent combination slot are different, and the number of slot layers occupied by each slot in each adjacent combination slot is N / 2; the slot layers occupied by the q slots of at least one adjacent combination slot are arranged adjacently, and the slot layers occupied by at least one slot in the remaining adjacent combination slots are divided into two interval groups, one of which occupies 1 slot layer and the other group occupies 2 slot layers, and the two groups of slot layers are separated by (N-3) slot layers.

[0028] Specifically, for any parallel branch winding, the meaning of its adjacent combination slots is that the combination of several adjacent slots in the stator slots occupied by the hairpin coil of the parallel branch winding is called an adjacent combination slot, and the number of adjacent combination slots corresponds to the number of poles of the motor. Figure 7In the 6-pole 54-slot motor shown, the 1st, 2nd and 3rd slots are an adjacent combined slot, the 10th, 11th and 12th slots are an adjacent combined slot, the 19th, 20th and 21st slots are an adjacent combined slot, the 28th, 29th and 30th slots are an adjacent combined slot, the 37th, 38th and 39th slots are an adjacent combined slot, and the 46th, 47th and 48th slots are an adjacent combined slot, for a total of 6 adjacent combined slots, which are the 1st to 6th adjacent combined slots from left to right, and the number of slots in each adjacent combined slot is q=54 / 6 / 3=3.

[0029] The slot layers occupied by the q slots of the adjacent combined slots are arranged adjacently, which means that the occupied slot layers in each slot of the adjacent combined slots are adjacent and not separated, such as Figure 7 In the 6-pole 54-slot motor shown, the slot layers occupied by the q slots of the 1st and 2nd adjacent combination slots of the 1st parallel branch of the A-phase winding are arranged adjacently, and the q slots of the remaining adjacent combination slots have non-adjacent slot layers, such as the 21st slot of the 3rd adjacent combination slot, which occupies the 1st, 5th, and 6th slot layers, and the 1st slot layer and the 5th slot layer are not adjacent. The slot layers occupied by the q slots of the 4th and 5th adjacent combination slots of the 2nd parallel branch of the A-phase winding are arranged adjacently, and the q slots of the remaining adjacent combination slots have non-adjacent slot layers, such as the 2nd and 3rd slots of the 1st adjacent combination slot.

[0030] At least one of the remaining adjacent combination slots has its slot layers divided into two alternate groups, which refers to adjacent combination slots with non-adjacent slot layers. For example, the third adjacent combination slot of the first parallel branch of the A-phase winding has its 21st slot occupied by the 1st, 5th and 6th slot layers. The 1st slot layer is one group, and the number of occupied slot layers is 1. The 5th and 6th slot layers are another group, and the number of occupied slot layers is 2. There are 3 slot layers between the two groups of slot layers.

[0031] By adopting the above slot layer distribution, each adjacent combination slot corresponds to a pole of the motor, and the N pole and S pole of the motor are arranged alternately, so the direction of the current flowing through each hairpin coil is arranged alternately in positive and negative directions, which is convenient for winding, and there are few types of cross-layer hairpin coil line types during winding, such as Figure 8 As shown, there are only two types of lines, namely, the cross-layer hairpin coil between the 2nd slot layer and the 3rd slot layer, and the cross-layer hairpin coil between the 4th slot layer and the 5th slot layer, which is convenient for manufacturing and automated production, and is beneficial for reducing the production cost of the hairpin coil.

[0032] like Figure 5 and Figure 6 As shown, the voltage lead wires and neutral point lead wires of the three-phase stator winding are both connected in star or triangle.

[0033] 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 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.

[0034] like Figure 4 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.

[0035] by Figure 4 From 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 and the bottom end of the left welding segment 23 of the right U-shaped hairpin coil 20 are welded together through a welding connection line. 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.

[0036] The I-type hairpin coil is equivalent to half of the U-type hairpin coil 20. Figure 4 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.

[0037] In one embodiment, 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 the winding wire insertion end, and the welding section 23 forms the winding welding end.

[0038] As a specific implementation method, among the P adjacent combined slots, the slot layers occupied by the q slots of two adjacent combined slots are arranged adjacently, such as Figure 7 shown.

[0039] As a specific implementation, when only one slot in the adjacent combination of slots occupies a slot layer that is divided into two groups, the slot is located at the outermost side of the adjacent combination of slots, such as Figure 7 The 21st slot of the 3rd adjacent combination slot and the 46th slot of the 6th adjacent combination slot of the 1st parallel branch of the A-phase winding, and the 19th slot of the 3rd adjacent combination slot and the 48th slot of the 6th adjacent combination slot of the 2nd parallel branch of the A-phase winding are shown to further reduce the types of hairpin coil line types.

[0040] Similarly, when there are two slots in the adjacent combination slots and the slot layers they occupy are divided into two groups, the two slots are arranged adjacent to each other, such as Figure 7 The 29th and 30th slots of the 4th adjacent combination slots of the 1st parallel branch of the A-phase winding, the 37th and 38th slots of the 5th adjacent combination slots, the 2nd and 3rd slots of the 1st adjacent combination slots of the 2nd parallel branch of the A-phase winding, and the 10th and 11th slots of the 2nd adjacent combination slots, are shown to further reduce the types of hairpin coil line types.

[0041] If the span of the hairpin coils on the outermost or innermost layer of any parallel branch winding is (Z / P-1) or (Z / P-2), the hairpin coils on the same layer have fewer span types, and the corresponding hairpin coil line types used are fewer. Figures 7 to 9 As shown, the spans of the hairpin coils of the same layer in the outermost or innermost layer are only 8 and 7.

[0042] The span of the hairpin coils of any parallel branch from the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any parallel branch from the 1st slot layer to the Nth slot layer is Z / P. Then the spans of the hairpin coils across the layers are equal, and the welding spans are also equal, that is, there is only one span, which also reduces the number of hairpin coil line types, facilitates welding, and facilitates automated production.

[0043] The voltage lead wire and the neutral point lead wire of any parallel branch are (Z / P+2) slots apart, and the voltage lead wire and the neutral point lead wire are led out at the outermost slot layer or the innermost slot layer respectively. Figure 8 and Fig. 9 As shown, the voltage lead-out line of the first parallel branch of phase A (winding in from the in position) and the neutral point lead-out line (leading out from the out position to the three-phase center point) differ by (54 / 6+2), or 11 slots; the voltage lead-out line of the second parallel branch of phase A (winding in from the in position) and the neutral point lead-out line (leading out from the out position to the three-phase center point) differ by (54 / 6+2), or 11 slots, thereby facilitating winding.

[0044] The following embodiments take the case where the number of motor poles P is 6, the number of stator slots 13 Z is 54, each stator slot 13 contains 6 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 motor of the present invention.

[0045] The U-shaped hairpin coil 20 of the stator assembly 10 of this embodiment has only three spans, namely (Z / P-1), (Z / P-2), and Z / P, i.e., 8, 7, and 9. 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.

[0046] 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. 10(2) represents the 2nd slot layer in the 10th slot, referred to as slot 10th slot layer layer. The same applies to the other slot numbers below.

[0047] like Figure 8 , 9 As shown, the horizontally arranged numbers 1 to 54 represent the slot numbers, which are arranged in a circle in a ring. Figure 2 As shown; the vertically arranged numbers 1 to 6 represent slot layers, with a total of 6 slot layers. Among them, the solid line with an arrow represents the wiring method of the winding plug-in end, and each solid line with an arrow represents a U-shaped hairpin coil 20. The dotted line with an arrow represents the wiring method of the winding welding end, and each dotted line with an arrow represents the welding line between the adjacent welding ends of two adjacent U-shaped hairpin coils 20; A1 and A2 can be used as the voltage lead-out line of phase A or as the neutral point lead-out line, and correspondingly, X1 and X2 can be used as the voltage lead-out line or as the neutral point lead-out line, for example, A1 is used as the voltage lead-out line of the first parallel branch of phase A, and X1 is used as the neutral point lead-out line of the first parallel branch of phase A; A2 is used as the voltage lead-out line of the second parallel branch of phase A, and X2 is used as the neutral point lead-out line of the second parallel branch of phase A.

[0048] Similarly, B1 and B2 can be used as the voltage lead-out wires of phase B and as the neutral point lead-out wires. Correspondingly, Y1 and Y2 can be used as the voltage lead-out wires and as the neutral point lead-out wires. For example, B1 is used as the voltage lead-out wire of the first parallel branch of phase B, and Y1 is used as the neutral point lead-out wire of the first parallel branch of phase B; B2 is used as the voltage lead-out wire of the second parallel branch of phase B, and Y2 is used as the neutral point lead-out wire of the second parallel branch of phase B.

[0049] C1 and C2 can be used as the voltage lead-out wires of phase C and also as the neutral point lead-out wires. Correspondingly, Z1 and Z2 can be used as the voltage lead-out wires and also as the neutral point lead-out wires. For example, C1 is used as the voltage lead-out wire of the first parallel branch of phase C, and Z1 is used as the neutral point lead-out wire of the first parallel branch of phase C; C2 is used as the voltage lead-out wire of the second parallel branch of phase C, and Z2 is used as the neutral point lead-out wire of the second parallel branch of phase C.

[0050] like Figure 8 As shown, the first parallel branch of phase A goes in from the in position (1st slot, 2nd slot layer) and finally goes out from the out position (12th slot, 6th slot layer) to the three-phase center point. The slot numbers through which the first parallel branch is connected in series are: 1(1)-10(2)-19(3)-28(4)-37(5)-46(6)-38(6)-29(5)-20(4)-11(3)-2(2)-47(1)-39(1)-48(2)-3(3)-12(4)-21(5)-30(6)-37(6)-28(5)-19(4)-10(3)-1(2)-46(1)-38(1)-47(2)-2(3)- 11(4)-20(5)-29(6)-21(6)-12(5)-3(4)-48(3)-39(2)-30(1)-37(1)-46(2)-1(3)-10(4)-19(5)-28(6)-20(6)-11(5)-2(4)-47(3)-38(2)-29(1)-21(1)-30(2)-39(3)-48(4)-3(5)-12(6).

[0051] like Fig. 9 As shown, the second parallel branch of phase A goes in from the in position (the 28th slot, the 1st slot layer) and finally goes out from the out position (the 39th slot, the 6th slot layer) to the center point of the three phases. The slot numbers through which the second parallel branch is connected in series are: 28(1)-37(2)-46(3)-1(4)-10(5)-19(6)-11(6)-2(5)-47(4)-38(3)-29(2)-20(1)-12(1)-21(2)-30(3)-39(4)-48(5)-3(6)-10(6)-1(5)-46(4)-37(3)-28(2)-19(1)-11(1)-20(2)-29(3) -38(4)-47(5)-2(6)-48(6)-39(5)-30(4)-21(3)-12(2)-3(1)-10(1)-19(2)-28(3)-37(4)-46(5)-1(6)-47(6)-38(5)-29(4)-20(3)-11(2)-2(1)-48(1)-3(2)-12(3)-21(4)-30(5)-39(6).

[0052] 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 12 (6); A2 corresponds to 28 (1), X2 corresponds to 39 (6); the cross-layer hairpin coil pitch of the two branch windings is 9, the same-layer hairpin coil pitch is 7 or 8, and the welding end hairpin coil pitch is 9; the two branch windings have the same coil pitch, the same resistance value, and are completely symmetrical around the circumference, and there is no potential difference to cause branch circulation.

[0053] 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.

[0054] This embodiment also provides a vehicle, comprising the above-mentioned motor.

[0055] 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 motor, comprising a rotor and a stator assembly, characterized in that: The stator assembly comprises: 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 N slot layers along the radial direction of the stator core; A three-phase stator winding is wound in the stator core and is arranged rotationally symmetrically along the circumferential direction of the stator core; any one phase winding of the three-phase stator winding includes a parallel branches, a is 1 or 2, and each of the parallel branches contains a plurality of hairpin coils with different spans; when a is 1, N layers of the hairpin coils are arranged in any stator slot, and the hairpin coils of the parallel branches traverse N slot layers in different stator slots; when a is 2, the two parallel branches are rotationally symmetrical in the circumferential direction of the stator core, N layers of the hairpin coils are arranged in any stator slot, and each of the parallel branches traverses N slot layers. The hairpin coil of the circuit traverses N / 2 slot layers in different stator slots; any of the parallel branches has P adjacent combination slots, P is the number of poles of the motor, the number of slots of each adjacent combination slot is q, q=Z / P / 3, the slot layers occupied by each adjacent combination slot are different, and the number of slot layers occupied by each slot in each adjacent combination slot is N / 2; the slot layers occupied by q slots of at least one adjacent combination slot are arranged adjacently, and the slot layers occupied by at least one slot of the remaining adjacent combination slots are divided into two interval groups, one of which occupies 1 slot layer, and the other group occupies 2 slot layers, and the two groups of slot layers are separated by (N-3) slot layers.

2. The motor according to claim 1, characterized in that Among the P adjacent combined slots, the slot layers occupied by the q slots of 2 adjacent combined slots are arranged adjacently.

3. The motor according to claim 1, characterized in that When the slot layer occupied by only one slot in the adjacent combined slots is divided into two groups, the slot is located at the outermost side of the adjacent combined slots.

4. The motor according to claim 1, characterized in that When there are two grooves in adjacent combined grooves and the groove layers occupied by them are divided into two groups, the two grooves are arranged adjacent to each other.

5. The electric machine according to any one of claims 1 to 4, characterized in that The span of the hairpin coils on the same layer in the outermost layer or the innermost layer of any of the parallel branch windings is (Z / P-1) or (Z / P-2).

6. The motor according to claim 5, characterized in that The hairpin coil span of any parallel branch from the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any parallel branch from the 1st slot layer to the Nth slot layer is Z / P.

7. The motor according to claim 1, characterized in that The voltage lead-out line and the neutral point lead-out line of any parallel branch are (Z / P+2) slots apart, and the voltage lead-out line and the neutral point lead-out line are led out at the outermost slot layer or the innermost slot layer respectively.

8. The motor according to claim 1, characterized in that The voltage lead wires and neutral point lead wires of the three-phase stator winding are both star-connected or delta-connected.

9. A vehicle, characterized in that: A motor comprising the motor according to any one of claims 1 to 8.

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