Electric machine and vehicle

Abstract

The application provides a motor and a vehicle, wherein a stator assembly comprises a stator core and a three-phase stator winding, any phase winding of the three-phase stator winding comprises a strip parallel branch, any parallel branch has P adjacent combination slots, the slot number of each adjacent combination slot is q, q=Z / P / 3, the slot layers occupied by each adjacent combination slot are different, and the slot layer number of 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 groups at intervals, the slot layer number of one group is 1, the slot layer number of the other group is 2, and (N-3) slot layers are arranged between the two groups of slot layers. The application can solve the problems of the prior art, i.e., the easy generation of circulating current among multiple parallel branches of the three-phase winding of the motor stator, and the complex production process and high manufacturing cost caused by the multiple types of hairpin coils.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to an electric machine and a vehicle comprising the same. BACKGROUND

[0002] With the popularization 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 becoming higher and higher. The main drive motor is one of the core components of the electric vehicle, and is developing towards high power density and high torque density, small size and light weight. With the development of flat wire technology, the main drive motor of the electric vehicle gradually adopts flat wire winding, which can improve the slot fill factor 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, the flat wire motor mainly adopts wave winding or laminated winding structure. By designing the flat wire in the winding structure into a multi-layer structure, the alternating current resistance of the motor can be effectively reduced. However, with the increase in the number of flat wires, the wiring method of the winding structure is also different. In the prior art, when the stator winding branches of each phase are connected, the twisting direction of the coil slot outer end or the distance between the twisted slots is inconsistent, and various types of hairpin coils are used, which has complex manufacturing process, difficult forming, high production cost and low processing efficiency. In addition, due to the complex motor winding structure, potential imbalance easily occurs between the same phase branches, which causes circulating current to form between the branches, affecting the efficiency and temperature rise of the motor. SUMMARY

[0004] The present application provides an electric machine and a vehicle, which can solve the problem of circulating current between multiple parallel branches of the three-phase winding of the motor stator in the prior art, and the complex production process and high manufacturing cost caused by the multiple types of hairpin coils.

[0005] To achieve the above technical effects, the technical solution adopted by the present application is an electric machine comprising a rotor and a stator assembly, wherein the stator assembly comprises:

[0006] a stator core, the inner wall of which is uniformly distributed with Z stator slots in the circumferential direction, and each stator slot is divided into N slot layers along the radial direction of the stator core;

[0007] Three-phase stator windings are wound in the stator core and arranged rotationally symmetrically along the circumference of the stator core; any phase winding of the three-phase stator windings comprises a strip of parallel branches, a is 1 or 2, each parallel branch contains a plurality of hairpin coils of 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 branch traverse N slot layers in different stator slots; when a is 2, the two parallel branches are rotationally symmetric in the circumferential direction of the stator core, N layers of the 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; any parallel branch 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 q slots of at least one adjacent combination slot are arranged adjacently in slot layers, and at least one slot in the remaining adjacent combination slots is divided into two groups with an interval, one group 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.

[0008] In the technical scheme of the application, the following additional technical features are also included:

[0009] Of the P adjacent combination slots, the q slots of two adjacent combination slots are arranged adjacently in slot layers.

[0010] When only one slot in an adjacent combination slot is divided into two groups, the slot is located at the outermost side of the adjacent combination slot.

[0011] When two slots in an adjacent combination slot are divided into two groups, the two slots are arranged adjacently.

[0012] The span of the hairpin coil of any parallel branch winding in the same layer of the outermost layer or the innermost layer is (Z / P-1) or (Z / P-2).

[0013] The span of the hairpin coil of any parallel branch in the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any parallel branch in the 1st slot layer to the Nth slot layer is Z / P.

[0014] The voltage lead and the neutral point lead of any parallel branch differ by (Z / P+2) slots, and the voltage lead and the neutral point lead are led out in the outermost slot layer or the innermost slot layer, respectively.

[0015] The voltage lead and the neutral point lead of the three-phase stator windings are connected in star or triangle.

[0016] The application also proposes a vehicle comprising the above motor.

[0017] Compared with the prior art, the present application has the following advantages and positive effects:

[0018] 1. The motor of the present application, the three-phase stator windings of the stator assembly are symmetrically distributed along the circumferential direction of the stator core, and when any one winding includes two parallel branches, the two parallel branches are also rotationally symmetric in the circumferential direction of the stator core, so that the magnetic field distribution of the multiple parallel branches in each winding is the same, the magnetic potential is balanced, the circulating current between the parallel branches is avoided, the motor efficiency is improved, the local temperature rise of the winding is avoided, and the service life of the flat wire motor is prolonged.

[0019] 2. The slot layer distribution of each parallel branch makes each adjacent combined slot correspond to one pole of the motor, and the N and S poles of the motor are staggered, so that the current direction flowing through each hairpin coil is positive and negative staggered, thereby facilitating winding and reducing the types of cross-layer hairpin coil wire types, facilitating manufacturing and automatic production. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a three-dimensional structure schematic diagram of the stator assembly of the motor in the embodiment of the present application.

[0022] Figure 2 It is a three-dimensional structure schematic diagram of the stator core of the stator assembly in the embodiment of the present application.

[0023] Figure 3 It is a schematic diagram of the slot layer distribution in the stator slot of the stator assembly in the embodiment of the present application.

[0024] Figure 4 It is a schematic diagram of the U-shaped hairpin coil structure in the embodiment of the present application.

[0025] Figure 5 It is a circuit schematic diagram of the three parallel branches of each winding in the three-phase stator winding of the stator assembly in the embodiment of the present application adopting star connection.

[0026] Figure 6 It is a circuit schematic diagram of the two parallel branches of each winding in the three-phase stator winding of the stator assembly in the embodiment of the present application adopting delta connection.

[0027] Figure 7 It is a slot layer distribution diagram of the two parallel branches of the A-phase winding of the 6-pole 54-slot motor in the embodiment of the present application.

[0028] Figure 8 Figure 1 is a schematic diagram of a winding mode of a first parallel branch of an A-phase winding of a 6-pole 54-slot motor according to an embodiment of the present application;

[0029] Figure 9 Figure 2 is a schematic diagram of a winding mode of a second parallel branch of an A-phase winding of a 6-pole 54-slot motor according to an embodiment of the present application.

[0030] In the drawings: 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 DESCRIPTION

[0031] In the description of the present application, it should be noted that unless specifically defined and limited otherwise, the terms "mounting", "connected", "connection" should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium, can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0033] For the convenience of understanding, the following first explains the professional terms appearing in the present application as follows.

[0034] Stator: refers to the stationary part of the motor, which functions to generate a rotating magnetic field.

[0035] Rotor: refers to the rotating part of the motor, which functions to realize the conversion of electrical energy and mechanical energy.

[0036] The embodiment of the present application provides a motor, which comprises a rotor and a stator assembly 10, the rotor is arranged in a space formed by the inner wall of the stator core 11 of the stator assembly 10. As shown in Figure 1 and Figure 2 The stator assembly 10 comprises a stator core 11 and a three-phase stator winding 12 wound in the stator core 11, the inner wall of the stator core 11 is uniformly arranged with Z stator slots 13 in the circumferential direction, each stator slot 13 is divided into N slot layers along the radial direction of the stator core 11, and 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 not equal to 0.

[0037] As shown in Figure 3Each stator slot 13 is divided into 6 slot layers along the radial direction of the stator core 11, i.e. N=6, i.e. each stator slot 13 contains 6 layers of flat wire conductors, the first layer is denoted as D1, the second layer is denoted as D2, the third layer is denoted as D3, the fourth layer is denoted as D4, the fifth layer is denoted as D5, and the sixth layer is denoted 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 referred to as the innermost layer, and the slot bottom layer is also referred to as the outermost layer.

[0038] Any one of the three-phase stator windings 12 (A-phase winding, B-phase winding and C-phase winding) includes a parallel branch a, a is 1 or 2, and each parallel branch contains a plurality of hairpin coils with different spans. When a is 1, N layers of hairpin coils are arranged in each 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 rotational symmetry of the two parallel branches in each phase winding 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 circulating current between the parallel branches is avoided, thereby greatly reducing the additional alternating current copper loss under high speed working condition, improving the efficiency of the flat wire motor, and avoiding local temperature rise of the winding. Overheating, prolonging the service life of the flat wire motor.

[0039] When a is 2, N layers of hairpin coils are arranged in each stator slot, and the hairpin coils of each parallel branch traverse N / 2 slot layers in different stator slots.

[0040] Any one parallel branch 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, 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 q slots of at least one adjacent combination slot are arranged adjacent to each other in slot layers, and at least one slot in the remaining adjacent combination slots is divided into two groups with an interval, one group 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.

[0041] Specifically, for any one parallel branch winding, the meaning of adjacent combination slots refers to the combination of several adjacent slots in the stator slots occupied by the hairpin coils of the parallel branch winding, and the motor has how many poles, then there are how many adjacent combination slots. Figure 7The 6-pole 54-slot motor shown, the 1st, 2nd, and 3rd slots are a group of adjacent slots, the 10th, 11th, and 12th slots are a group of adjacent slots, the 19th, 20th, and 21st slots are a group of adjacent slots, the 28th, 29th, and 30th slots are a group of adjacent slots, the 37th, 38th, and 39th slots are a group of adjacent slots, and the 46th, 47th, and 48th slots are a group of adjacent slots, a total of 6 groups of adjacent slots, and the 1st to 6th groups of adjacent slots are sequentially arranged from left to right, and the number of slots q = 54 / 6 / 3 = 3 for each group of adjacent slots.

[0042] The q slots of the adjacent group of slots are arranged adjacently in the slot layer, that is, each slot of the adjacent group of slots is adjacent in the occupied slot layer and is not separated, such as Figure 7 The 6-pole 54-slot motor shown, the 1st, 2nd, and 3rd slots are a group of adjacent slots, the 10th, 11th, and 12th are a group of adjacent slots, the 19th, 20th, and 21st slots are a group of adjacent slots, the 28th, 29th, and 30th slots are a group of adjacent slots, the 37th, 38th, and 39th slots are a group of adjacent slots, the 46th, 47th, and 48th slots are a group of adjacent slots, a total of 6 groups of adjacent slots, and the 1st to 6th groups of adjacent slots are sequentially arranged from left to right, and the number of slots q = 54 / 6 / 3 = 3 for each group of adjacent slots.

[0043] At least one slot in the remaining adjacent group of slots is divided into two groups with an interval, that is, there is an adjacent group of slots with non-adjacent slot layers, such as the 3rd adjacent group of slots of the 1st parallel branch of the A-phase winding, the 21st slot of which is occupied by the 1st, 5th, and 6th slot layers, the 1st slot layer is one group, the number of occupied slot layers is 1, the 5th and 6th slot layers are another group, the number of occupied slot layers is 2, and there is an interval of 3 slot layers between the two groups of slot layers.

[0044] The above slot layer distribution makes each adjacent group of slots correspond to one pole of the motor, and the N and S poles of the motor are staggered, so the current direction flowing through each exciting coil is positive and negative, which facilitates winding, and the number of cross-layer exciting coil wire types is small during winding, such as Figure 8 As shown, there are only two types of cross-layer exciting coils, one between the 2nd and 3rd slot layers and the other between the 4th and 5th slot layers, which facilitates manufacturing, is conducive to automated production, and helps reduce the production cost of exciting coils.

[0045] As shown in Figure 5 and Figure 6 The voltage lead and neutral point lead of the three-phase stator winding are connected in star or delta.

[0046] The hairpin coils of each parallel branch include U-shaped hairpin coils 20 and I-shaped hairpin coils, the I-shaped hairpin coils are located at the incoming line end and the outgoing line end of each parallel branch, and the U-shaped hairpin coils 20 are located between the I-shaped hairpin coils at the two ends, that is, each parallel branch contains only two I-shaped hairpin coils, and the rest are U-shaped hairpin coils 20.

[0047] As shown in Figure 4 , the U-shaped hairpin coil 20 is formed by a flat conductor, the cross section of the flat 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 are both protruded outside the end surface of the stator core 11, the two ends of the bent connecting section 21 are connected to the same end of the two straight sections 22 respectively, and the same end of the two welding sections 23 is connected to the other end of the two straight sections 22 respectively, so that the potential phase difference caused by the position of the multiple parallel branches in the stator slot 13 in each phase winding can be eliminated.

[0048] As shown in the view angle of Figure 4 , the two ends of the bent connecting section 21 are connected to the top ends of the two straight sections 22 respectively, and the top ends of the two welding sections 23 are connected to the bottom ends of the two straight sections 22 respectively. The bent connecting sections 21 of all the U-shaped hairpin coils 20 are located at one end of the stator core 11 to form a winding plug-in end, and the welding sections 23 of all the U-shaped hairpin coils 20 are located at the other end of the stator core 11, the adjacent welding sections 23 of adjacent U-shaped hairpin coils 20 are welded together to form a winding welding end, for example, the bottom end of the right side welding section 23 of the left side U-shaped hairpin coil 20 is welded together with the bottom end of the left side welding section 23 of the right side U-shaped hairpin coil 20 through a welding connecting line. The span refers to the number of stator slots 13 crossed by the two straight sections 22 of the U-shaped hairpin coil 20; and the welding pitch between the hairpin coils refers to the number of stator slots crossed by the adjacent straight sections 22 of adjacent hairpin coils.

[0049] The I-shaped hairpin coil is equivalent to half of the U-shaped hairpin coil 20, as shown in the view angle of Figure 4 , the I-shaped hairpin coil is equivalent to the left half or the right half of the U-shaped hairpin coil 20, and the structure thereof will not be described again.

[0050] In an embodiment, the U-shaped hairpin coil 20 can be inserted into the stator slot 13 and then bent to form the 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 plug-in end, and the welding section 23 forms a winding welding end.

[0051] As a specific embodiment, in the P adjacent combination slots, the q slots of the 2 adjacent combination slots are arranged in adjacent slots, as shown in Figure 7 .

[0052] As a specific embodiment, when only one slot in the adjacent combination slot is divided into two groups, the slot is located at the outermost side of the adjacent combination slot, 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, so as to further reduce the types of hairpin coil wire.

[0053] Similarly, when two slots in the adjacent combination slot are divided into two groups, the two slots are arranged adjacently, such as Figure 7 The 29th slot and the 30th slot of the 4th adjacent combination slot, the 37th slot and the 38th slot of the 5th adjacent combination slot of the 1st parallel branch of the A-phase winding, and the 2nd slot and the 3rd slot of the 1st adjacent combination slot, the 10th slot and the 11th slot of the 2nd adjacent combination slot of the 2nd parallel branch of the A-phase winding are shown, so as to further reduce the types of hairpin coil wire.

[0054] The same layer hairpin coil span of any parallel branch winding in the outermost layer or the innermost layer is (Z / P-1) or (Z / P-2), so that the types of the same layer hairpin coil span are less, and the types of the hairpin coil wire used are less. As shown in Figures 7 to 9 The same layer hairpin coil span of the outermost layer or the innermost layer is only 8 and 7.

[0055] The hairpin coil span of any parallel branch in the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any parallel branch in the 1st slot layer to the Nth slot layer is Z / P. Then the spans of the cross-layer hairpin coils are equal, and the welding spans are also equal, that is, there is only one span, which also makes the types of the hairpin coil wire less, and facilitates welding and automation production.

[0056] The voltage lead wire and the neutral point lead wire of any parallel branch are different by (Z / P+2) slots, and the voltage lead wire and the neutral point lead wire are led out in the outermost slot layer or the innermost slot layer. As shown in Figure 8 and Figure 9 The voltage lead wire (wound from the in position) and the neutral point lead wire (led out from the out position to the three-phase center point) of the 1st parallel branch of the A-phase are different by (54 / 6+2) slots, that is, 11 slots, and the voltage lead wire (wound from the in position) and the neutral point lead wire (led out from the out position to the three-phase center point) of the 2nd parallel branch of the A-phase are different by (54 / 6+2) slots, that is, 11 slots, so as to facilitate winding.

[0057] The following embodiments use an example where the motor has 6 poles P, 54 stator slots Z, each stator slot 13 contains 6 slot layers, and each phase winding of the three-phase stator winding 12 includes 2 parallel branches to illustrate the winding structure of each phase winding of the motor of the present invention.

[0058] The U-shaped hairpin coil 20 of the stator assembly 10 in this embodiment has only three spans: (Z / P-1), (Z / P-2), and Z / P, i.e., 8, 7, and 9. The stator assembly 10 is composed of three-phase stator windings 12 (A-phase winding, B-phase winding, and C-phase winding) with a phase difference of 120 electrical degrees, and the three-phase stator windings 12 are wound in the stator core 11.

[0059] Slot number i(j) represents the j-th slot layer in the i-th slot. For example, 1(1) below represents the 1st slot layer in the 1st slot, or simply the 1st slot layer. 10(2) represents the 2nd slot layer in the 10th slot, or simply the 10th slot layer. The other slot numbers below are explained in the same way.

[0060] like Figure 8 , 9 As shown, the horizontally arranged numbers 1 to 54 represent the slot numbers, and they are arranged in a ring. Figure 2 As shown; the vertically arranged numbers 1 to 6 represent slot layers, with a total of 6 slot layers. Solid lines with arrows represent the wiring method of the winding insertion terminals; each solid line with an arrow represents a U-shaped hairpin coil 20. Dashed lines with arrows represent the wiring method of the winding welding terminals; each dashed line with an arrow represents the welding line between adjacent welding terminals of two adjacent U-shaped hairpin coils 20. A1 and A2 can be used as voltage leads for phase A or as neutral point leads. Correspondingly, X1 and X2 can be used as voltage leads or as neutral point leads. For example, A1 can be used as the voltage lead for the first parallel branch of phase A, and X1 as the neutral point lead for the first parallel branch of phase A; A2 can be used as the voltage lead for the second parallel branch of phase A, and X2 as the neutral point lead for the second parallel branch of phase A.

[0061] Similarly, B1 and B2 can be used as voltage leads for phase B or as neutral point leads. Correspondingly, Y1 and Y2 can be used as voltage leads or as neutral point leads. For example, B1 can be used as the voltage lead for the first parallel branch of phase B, and Y1 can be used as the neutral point lead for the first parallel branch of phase B; B2 can be used as the voltage lead for the second parallel branch of phase B, and Y2 can be used as the neutral point lead for the second parallel branch of phase B.

[0062] C1 and C2 can be used as voltage leads for phase C or as neutral point leads. Similarly, Z1 and Z2 can be used as voltage leads or as neutral point leads. For example, C1 can be used as the voltage lead for the first parallel branch of phase C, and Z1 can be used as the neutral point lead for the first parallel branch of phase C; C2 can be used as the voltage lead for the second parallel branch of phase C, and Z2 can be used as the neutral point lead for the second parallel branch of phase C.

[0063] like Figure 8 As shown, the first parallel branch of phase A enters from the in position (slot 1, layer 2) and exits from the out position (slot 12, layer 6) to the three-phase center point. The slot numbers traversed by the first parallel branch in series are:

[0064] 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).

[0065] like Figure 9 As shown, the second parallel branch of phase A enters from the in position (slot 28, layer 1) and exits from the out position (slot 39, layer 6) to the three-phase center point. The slot numbers traversed by the second parallel branch in series are:

[0066] 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).

[0067] The start slot number and the end slot number corresponding to the two parallel branch windings are 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 coil pitches of the two branch windings are the same, the resistance values are the same, the circumferences are completely symmetrical, and no potential difference causes branch circulating current.

[0068] The A-phase winding, the B-phase winding and the C-phase winding are symmetrically and uniformly distributed on the circumference of the stator core 11, and the winding mode of the B-phase winding and the C-phase winding will not be described here.

[0069] The embodiment further provides a vehicle comprising the motor.

[0070] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An electric machine comprising a rotor and stator assembly, characterized by, The stator assembly comprises: a stator core, the inner wall of which is uniformly distributed with Z stator slots in the circumferential direction, each of the stator slots being divided into N slot layers in the radial direction of the stator core; a three-phase stator winding wound in the stator core and arranged in rotational symmetry along the circumferential direction of the stator core; any phase winding of the three-phase stator winding comprises two parallel branches, the two parallel branches being rotationally symmetrical in the circumferential direction of the stator core, N-layer hairpin coils being provided in any of the stator slots, and the hairpin coils of each of the parallel branches traversing N / 2 slot layers in different stator slots; any of the parallel branches has P adjacent combination slots, P being the number of poles of the motor, the number of slots of each adjacent combination slot being q, q = Z / P / 3, the slot layers occupied by each adjacent combination slot being different, and the number of slot layers occupied by each slot in each adjacent combination slot being 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 groups at intervals, one of which occupies 1 slot layer and the other of which occupies 2 slot layers, the two groups of slot layers being separated by (N-3) slot layers.

2. The motor of claim 1, wherein of the P adjacent combination slots, the q slots of two adjacent combination slots are arranged adjacently.

3. The motor of claim 1, wherein when the slot layer occupied by only one slot in an adjacent combination slot is divided into two groups, the slot is located at the outermost side of the adjacent combination slot.

4. The motor of claim 1, wherein when the slot layers occupied by two slots in an adjacent combination slot are divided into two groups, the two slots are arranged adjacently.

5. The motor of any one of claims 1 to 4, wherein the span of the hairpin coils of any of the parallel branch windings in the same layer at the outermost layer or the innermost layer is (Z / P-1) or (Z / P-2).

6. The motor of claim 5, wherein the span of the hairpin coils of any of the parallel branches in the 2nd slot layer to the (N-1)th slot layer is Z / P, and the welding span of any of the parallel branches in the 1st slot layer to the Nth slot layer is Z / P.

7. The motor of claim 1, wherein the voltage lead and the neutral point lead of any of the parallel branches are separated by (Z / P+2) slots, and the voltage lead and the neutral point lead are respectively led out at the outermost layer or the innermost layer.

8. The motor of claim 1, wherein the voltage lead and the neutral point lead of the three-phase stator winding are connected in star or delta.

9. A vehicle characterized by comprising: The motor of any one of claims 1 to 8.

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