Flat wire stator and motor

Abstract

The utility model relates to a flat wire stator and a motor, the flat wire stator comprises a stator iron core, the stator iron core is provided with a plurality of stator grooves, the plurality of stator grooves penetrate through the stator iron core along the axial direction of the stator iron core, and the plurality of stator grooves are distributed along the circumferential direction of the stator iron core in an array manner; the windings are inserted into the plurality of stator slots of the stator core, the windings form 2N + 2 layers in each of the plurality of stator slots along the radial direction of the stator core, and N is a positive integer; the winding comprises M phases of sub-windings; the sub-winding of each phase comprises at least two parallel branches, and the at least two parallel branches are rotationally and symmetrically distributed around the axis of the stator core; each of the at least two branches connected in parallel comprises a plurality of conductors connected in series, and each of the plurality of conductors spans two adjacent layers; and the plurality of conductors have the same pitch. According to the flat wire stator, the connection mode of the winding is simplified.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely is a kind of flat wire stator and motor. BACKGROUND

[0002] In recent years, flat wire motor is more and more applied in new energy vehicle field due to its slot fill factor, good heat dissipation effect and low winding end height, compared with traditional round wire motor, the peak and continuous power of flat wire motor are greatly improved. Flat wire motor includes rotor and flat wire stator, and the flat wire stator includes core, insulating paper and flat wire winding. Flat wire winding is connected and welded by hairpin coil inserted into core slot, and its composition structure and connection sequence have important influence on performance, process and other aspects of flat wire motor. The fewer the types of hairpin coil structure used, the lower the production process difficulty, the higher the production efficiency. In the existing flat wire stator winding design, the winding scheme design is connected by multiple span hairpin coils, resulting in multiple wire types and high end height, which leads to high production process difficulty, low production efficiency, high cost, and the stator winding mainly adopts the same-slot same-phase in-slot distribution structure, resulting in high winding harmonic content, and the inner and outer layers of stator winding have outgoing lines, resulting in complex structure design of busbar, large size and increased cost. SUMMARY

[0003] In order to solve the above problems in the prior art, the purpose of the utility model is to provide a flat wire stator and motor, and the specific technical solutions are as follows:

[0004] A flat wire stator includes a stator core, the stator core is provided with a plurality of stator slots, the plurality of stator slots penetrate the stator core along the axial direction of the stator core, and the plurality of stator slots are arrayed along the circumferential direction of the stator core; and a winding, the winding is inserted into the plurality of stator slots of the stator core, and the winding forms 2N+2 layers along the radial direction of the stator core in each stator slot of the plurality of stator slots, N is a positive integer; the winding includes M-phase sub-windings, M is a positive integer; each phase of the sub-winding includes at least two parallel branches, the at least two parallel branches are rotationally symmetrically distributed around the axis of the stator core; each of the at least two parallel branches includes a plurality of series-connected conductors, each of the plurality of conductors spans two adjacent layers; and the pitches of the plurality of conductors are the same. The flat wire stator of the present application uses fewer wire types, simplifies the winding connection method, reduces the process difficulty, and can improve the production efficiency.

[0005] Optionally, the number of slots per pole per phase is 2, and the conductors of each pole per phase between adjacent layers of the stator slots are staggered by one stator slot in the circumferential direction of the stator core. This structure of the same slot and different phase can reduce the winding harmonic content, so as to improve the efficiency of the motor.

[0006] Optionally, the conductor comprises a plurality of first hairpin wires connected in series, a second hairpin wire connected in series with the plurality of first hairpin wires, and a third hairpin wire, the pitches of the first hairpin wire, the second hairpin wire and the third hairpin wire are the same; the first hairpin wire comprises a twisted segment, and the twisted segment extends out of one end of the stator core to form a welding end. In some embodiments, after the plurality of conductors are inserted into the plurality of stator slots, the part extending out of the stator core is twisted to form a twisted segment. The direction of the twist can be determined according to the actual situation. Since the pitches of the three hairpin wires are the same, the shapes of the crown ends are the same, the types of the conductor wire patterns are reduced, the winding arrangement mode of the winding is simplified, and the difficulty of the process is reduced.

[0007] Optionally, the introduction end and the outgoing end of each branch are arranged on one side of the welding end; and the introduction end and the outgoing end of each branch are arranged on the innermost layer of the plurality of stator slots close to the axis of the stator core. The outgoing positions of the winding are concentrated, which facilitates the design of the copper bar or busbar.

[0008] Optionally, each branch of the at least two parallel branches forms 2N+2 turns on the stator core, where N is a positive integer.

[0009] Optionally, each branch of the at least two parallel branches forms continuous N+1 turns in the same direction on the stator core, and then forms continuous N+1 turns in the opposite direction.

[0010] Optionally, the plurality of conductors are arranged in two turns between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots, and arranged in two turns between the 2Nth layer and the 2N-1th layer of the plurality of stator slots. By analogy, two turns are arranged between the 2th layer and the 1th layer of the plurality of stator slots. The winding arrangement mode is simple, and the assembly efficiency is improved.

[0011] Optionally, the plurality of conductors are arranged in one turn in the same direction between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots, and arranged in one turn between the 2Nth layer and the 2N-1th layer of the plurality of stator slots. By analogy, one turn is arranged between the 2th layer and the 1th layer. Then, one turn is arranged between the 1th layer and the 2th layer in the opposite direction, one turn is arranged between the 3th layer and the 4th layer, and by analogy, one turn is arranged between the 2N+1th layer and the 2N+2th layer. The winding arrangement mode is simple, and the assembly efficiency is improved.

[0012] Optionally, the winding comprises three-phase sub-windings, and the lead-in ends of each phase sub-winding are apart by 4M stator slots, M being a positive integer. The outgoing positions of the winding are concentrated, facilitating the design of copper bars or bus bars.

[0013] A motor comprising a rotating shaft, a rotor sleeved on the rotating shaft, and the flat wire stator of any one of the preceding claims coaxially arranged with the rotor. The motor is used for driving a vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0014] Other features and advantages of the present application will be described below in conjunction with the drawings, which illustrate the present application in more detail based on embodiments.

[0015] Figure 1 is a structural schematic view of the flat wire stator of the present application;

[0016] Figure 2 is a structural schematic view of the U-phase winding and the stator core assembly of the present application;

[0017] Figure 3 is an axial schematic view of the stator core of the present application;

[0018] Figure 4 is a partial schematic view of the stator core fully inserted with conductors of the present application;

[0019] Figure 5a is a winding diagram of the first branch of the U-phase winding of the present application;

[0020] Figure 5b is a winding diagram of the second branch of the U-phase winding of the present application;

[0021] Figure 6 is a structural schematic view of the first hairpin wire;

[0022] Figure 7 is a structural schematic view of the second hairpin wire;

[0023] Figure 8 is a structural schematic view of the third hairpin wire;

[0024] Figure 9 is a schematic view of part of the structure of the motor.

[0025] In the drawings, the main marks are as follows:

[0026] 1 - stator core, 11 - stator slot, 2 - winding, 2a - welding end, 2b - crown end, 21 - U-phase winding, 211 - branch, 211a - first branch, 211b - second branch, 3 - conductor, 31 - first hairpin wire, 32 - second hairpin wire, 33 - third hairpin wire, 311, 321, 331 - insertion section, 311a, 321a, 331a - left insertion section, 311b, 321b, 331b - right insertion section, 313, 323, 333 - connection section, 312, 322, 332 - torsion section, 312a, 322a, 332a - left torsion section, 312b, 322b, 332b - right torsion section, 4 - rotating shaft, 5 - rotor DETAILED DESCRIPTION

[0027] The preferred embodiments of the utility model are described below with reference to the drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "back" and similar expressions used herein are for illustrative purposes only and are not limiting to the utility model.

[0028] A flat wire stator comprises a stator core 1, the stator core 1 is provided with a plurality of stator slots 11, the plurality of stator slots 11 penetrate the stator core 1 along the axial direction of the stator core 1, and the plurality of stator slots 11 are arrayed along the circumferential direction of the stator core 1; and a winding 2, the winding 2 is inserted into the stator slots 11 of the stator core 1, and the winding 2 forms 2N+2 layers along the radial direction of the stator core 1 in each stator slot 11 of the plurality of stator slots, where N is a positive integer; the winding 2 comprises M-phase sub-windings, where M is a positive integer; each phase of the sub-windings comprises at least two parallel branches, and the at least two parallel branches are rotationally symmetrically distributed around the axis of the stator core 1; each of the at least two parallel branches comprises a plurality of series-connected conductors 3, and each of the plurality of conductors 3 spans two adjacent layers; and the pitches of the plurality of conductors 3 are the same.

[0029] As shown in Figures 1 to 3 The stator core 1 of the present embodiment has a hollow cylindrical structure, and has an inner surface close to the center of the stator core 1 along the radial direction. The stator core 1 is provided with a plurality of stator slots 11 penetrating the stator core 1 along the axial direction, and the plurality of stator slots 11 are arrayed along the circumferential direction of the stator core 1. The plurality of stator slots 11 extend radially from the inner surface of the stator core 1. In this example, the stator core 1 is provided with 48 stator slots 11. For ease of understanding, the numbers of each stator slot 11 are defined along the circumferential direction of the stator core 1. It should be noted that the starting position of each branch can be selected as any stator slot 11, and only one embodiment is given in this example. Figure 1As shown, the winding 2 is formed by a plurality of conductors 3 wound in a plurality of stator slots 11. In this example, the cross section of the conductors 3 is rectangular, i.e. flat wire winding, which facilitates increasing the slot fill factor of the winding 2, thereby improving the efficiency of the motor. The plurality of conductors 3 are wound in the plurality of stator slots 11 in 2N+2 layers along the radial direction of the stator core, where N is a positive integer. In this example, the winding 2 is formed in 6 layers in the plurality of stator slots 11. For ease of understanding, the layers are defined as the 1st layer, the 2nd layer, the 3rd layer, the 4th layer, the 5th layer and the 6th layer in sequence from the end farthest from the axis of the stator core 1 to the axis.

[0030] In some embodiments, each of the at least two parallel branches forms 2N+2 turns along the stator core 1, where N is a positive integer.

[0031] In some embodiments, each of the at least two parallel branches forms 2N+2 turns along the stator core 1, where N is a positive integer.

[0032] The winding 2 of this example includes three-phase sub-windings, each phase of the sub-winding includes two parallel branches, and the two parallel branches are distributed in rotational symmetry about the axis of the stator core 1. Each branch includes a plurality of series-connected conductors 3, and the plurality of series-connected conductors 3 forms 6 turns along the circumferential direction of the stator core 1. Among them, three turns are arranged in one direction, and three turns are arranged in the opposite direction. For example, Figure 2 and Figure 5a As shown, in this example, the U-phase winding 21 is taken as an example. The first branch 211a of the U-phase winding 21 is wound in 3 turns in the clockwise direction along the circumferential direction of the stator core 1, and in 3 turns in the counterclockwise direction along the circumferential direction of the stator core 1.

[0033] In some embodiments, the plurality of conductors 3 are arranged in two turns between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots 11, and in two turns between the 2Nth layer and the 2N-1th layer of the plurality of stator slots 11. By analogy, two turns are arranged between the 2th layer and the 1th layer of the plurality of stator slots 11.

[0034] In some embodiments, the plurality of conductors 3 are arranged in one turn between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots 11 in the same direction, and in one turn between the 2Nth layer and the 2N-1th layer. By analogy, one turn is arranged between the 2th layer and the 1th layer. Then, one turn is arranged between the 1th layer and the 2th layer in the opposite direction, one turn is arranged between the 3th layer and the 4th layer, and so on until one turn is arranged between the 2N+1th layer and the 2N+2th layer.

[0035] In each branch of each phase sub-winding of this example, the plurality of conductors 3 are series-connected and arranged in one turn between the 6th layer and the 5th layer of the plurality of stator slots 11 in the clockwise direction. In this example, the U-phase winding 21 is taken as an example, as shown in Figure 5aAs shown, the first branch 211a of the U-phase winding is wound in the slot No. 2 of the 6th layer, then enters the slot No. 9 of the 5th layer, the slot No. 14 of the 6th layer, the slot No. 21 of the 5th layer, the slot No. 21 of the 6th layer, the slot No. 26 of the 6th layer, the slot No. 33 of the 5th layer, the slot No. 38 of the 6th layer, the slot No. 45 of the 5th layer, which is a loop between the 6th layer and the 5th layer, the last conductor 3 of the branch between the 6th layer and the 5th layer is twisted to the 4th layer, and a loop is arranged between the 4th layer and the 3rd layer in the same way along the clockwise direction; a loop is arranged between the 2nd layer and the 1st layer in the same way along the clockwise direction; when winding from the 6th layer to the 1st layer along the clockwise direction, a loop is arranged between the 1st layer and the 2nd layer along the counterclockwise direction, as shown in the figure. Figure 5a As shown, the first conductor wound in the counterclockwise direction is connected in series with the last conductor wound in the clockwise direction, and the first conductor is wound in the counterclockwise direction from the slot No. 2 of the 1st layer, then enters the slot No. 43 of the 2nd layer, the slot No. 38 of the 1st layer, the slot No. 31 of the 2nd layer, the slot No. 26 of the 1st layer, the slot No. 19 of the 2nd layer, the slot No. 14 of the 1st layer, the slot No. 7 of the 2nd layer, and then enters the slot No. 2 of the 3rd layer, and a loop is arranged along the counterclockwise direction between the 3rd layer and the 4th layer in the same way; a loop is arranged along the counterclockwise direction between the 5th layer and the 6th layer in the same way, and finally the conductor is led out from the slot No. 7 of the 6th layer. Only one embodiment is given in the present application, and the winding direction of each branch is not specifically limited. In another embodiment, the winding direction is counterclockwise between the 6th layer and the 1st layer, and the winding direction is clockwise between the 1st layer and the 6th layer. This winding method is simple and simplifies the assembly difficulty.

[0036] In some embodiments, the number of slots per phase per pole is 2, and the conductor 3 of each pole per phase between adjacent layers of the plurality of stator slots 11 is staggered by one stator slot 11 along the circumference of the stator core 1.

[0037] The number of poles of the motor of the present embodiment is 8; the number of poles refers to the number of magnetic poles of the motor, and the magnetic poles are N poles and S poles. Generally, the number of magnetic poles is in pairs, and one N pole and one S pole are generally referred to as a pair of magnetic poles, that is, the number of pole pairs is 1. The number of slots per phase per pole of the present embodiment is 2, and the number of slots per phase per pole refers to the number of slots occupied by each phase sub-winding under each magnetic pole, as shown in the figure. Figure 5aAs shown, the conductors 3 in the first branch of the U-phase winding 21 are taken as an example, the conductors located in the first layer, the third layer and the fifth layer are arranged in the second slot and the third slot, and the conductors located in the second layer, the fourth layer and the sixth layer are arranged in the first slot and the second slot, that is, the U-phase winding 21 occupies two stator slots under each magnetic pole, and the conductors 3 between each adjacent layer are staggered by one stator slot 11 in the circumferential direction of the stator core 1; the winding 2 of each pole and each phase forms an asymmetric structure; the winding 2 of each pole has the same arrangement mode, and the positions of the winding 2 of each remaining pole can be determined according to this rule, so that each phase sub-winding forms a same-slot different-phase structure. The arrangement of the same-slot different-phase winding can reduce the harmonic content of the winding 2, so as to improve the efficiency of the motor.

[0038] In some embodiments, the plurality of conductors 3 includes a plurality of first hairpin wires 31 connected in series, a second hairpin wire 32 connected in series with the first hairpin wire 31, and a third hairpin wire 33, the pitches of the first hairpin wire 31, the second hairpin wire 32 and the third hairpin wire 33 are the same; the first hairpin wire 31 includes a twisted segment 311, the twisted segment 311 extends out of one end of the stator core 1 in the axial direction of the stator core 1 to form a welding end 2a.

[0039] In some embodiments, the leading end and the trailing end of each branch of the at least two branches are arranged on one side of the welding end 2a; the leading end and the trailing end of each branch of the at least two branches are arranged in the innermost layer of the plurality of stator slots close to the axis of the stator core 1.

[0040] As shown, Figure 6 As shown, the conductors 3 include the first hairpin wire 31, the first hairpin wire 31 includes a left insertion segment 311a accommodated in the inside of the stator core 1 and a right insertion segment 311b parallel to the left insertion segment 311a, the left insertion segment 311a and the right insertion segment 311b are arranged in adjacent layers, and one of the first hairpin wires 31 in the first branch of the U-phase winding is taken as an example, the left insertion segment 311a of the first hairpin wire 31 is accommodated in the sixteenth slot in the sixth layer, and the right insertion segment 311b of the first hairpin wire 31 is accommodated in the twenty-first slot in the fifth layer; the lower end of the left insertion segment 311a is bent in a direction away from the right insertion segment 311b to form a left twisted segment 312a, and the lower end of the right insertion segment 311b is bent in a direction away from the left insertion segment 311a to form a right twisted segment 312b; the left twisted segment 312a and the right twisted segment 312b extend out of one end of the stator core 1 in the axial direction of the stator core 1 to form a welding end 2a; the hairpin wire 31 further includes a connecting segment 313, the left end of the connecting segment 313 is connected to the upper end of the left insertion segment 311a, the right end of the connecting segment 313 is connected to the upper end of the right insertion segment 311b, and the connecting segment 313 extends out of the other end of the stator core 1 in the axial direction of the stator core 1 to form a crown end 2b; the crown end 2b and the welding end 2a are respectively located on the two sides of the stator core 1 in the axial direction.

[0041] The conductors 3 further include a second hairpin wire 32, as shownFigure 6 and Figure 7 As shown in FIG. 2, the second hairpin line 32 and the first hairpin line 31 are bent in the same direction and both are bent towards the axis of the stator core 1 so as to form a circular winding 2 along the stator core 1; the second hairpin line 32 and the first hairpin line 31 have the same pitch, which is 7 in this example; the pitch refers to the number of stator slots spanned between two insertion sections of a single hairpin line; for example, if the pitch is 8, one insertion section of the hairpin line 31 is inserted into the first slot and the other insertion section is inserted into the ninth slot, and the distance between the center lines of the two stator slots where the two insertion sections are located is 8 slots (half slot for each of the first slot and the ninth slot). The insertion section 321 and the connecting section 323 of the second hairpin line 32 have the same shape as the insertion section 311 and the connecting section 313 of the first hairpin line 31, the torsion section 322 of the second hairpin line 32 and the torsion section 312 of the first hairpin line 31 are bent in the same direction, and the difference lies in that the length of the vertical straight section of the left torsion section 322a of the second hairpin line 32 is greater than the length of the vertical straight section of the left torsion section 312a of the first hairpin line 31; the second hairpin line 32 is arranged at the leading end and the trailing end of each branch 21, which facilitates the connection with the copper bar or the bus bar.

[0042] The conductor 3 further comprises a third hairpin line 33, the third hairpin line 33 and the first hairpin line 31 are bent in the same direction and both are bent towards the axis of the stator core 1 so as to form a circular winding 2 along the stator core 1; the third hairpin line 33 and the first hairpin line 31 have the same pitch, which is 7 in this example; for example, Figure 6 and Figure 8As shown, the insertion section 331 and connecting section 333 of the third hairpin wire 33 have the same shape as the insertion section 311 and connecting section 313 of the first hairpin wire 31. The difference is that the left twist section 332a and right twist section 332b of the third hairpin wire 33 have the same twist direction. In this example, the left twist section 332a and right twist section 332b of the third hairpin wire 33 are both twisted to the left. Each branch 211 of each phase sub-winding 21 includes a third hairpin wire 33. The third hairpin wire 33 is used to realize the commutation of each branch 21. Taking the first branch 211a of the U-phase winding as an example, after multiple first hairpin wires 31 are wound three times in the same direction (clockwise in this example), the last one... The right insertion segment 311b of the first hairpin wire 31 is located in slot 45 of the first layer, and then connected to a third hairpin wire 33. The right insertion segment 331b of the third hairpin wire 33 is located in slot 2 of the first layer. The right twist segment 312b of the last first hairpin wire 31 wound clockwise is connected to the right twist segment 332b of the third hairpin wire 33. The left insertion segment 331a of the third hairpin wire 33 is located in slot 43 of the second layer, and then connected to the first hairpin wire 31. The right twist segment 312b of the first hairpin wire 31 is connected to the left twist segment 332a of the third hairpin wire 33. The first hairpin wire 31 is wound counterclockwise in the same manner, thus realizing the reversal of the first branch 211a.

[0043] In this embodiment, multiple conductors 3 can be inserted into multiple stator slots 11, and then the inserted section extending out of the stator core 1 can be twisted to form a twisted section. The twisting direction is as shown by the first hairpin wire 31, the second hairpin wire 32 and the third hairpin wire 33. The three hairpin wires have the same pitch, the winding method is simple, the difficulty of the process is reduced and the production efficiency is improved.

[0044] In some embodiments, the winding 2 includes a three-phase sub-winding, wherein the lead-in ends of each phase sub-winding are separated by 4M stator slots 11, where M is a positive integer.

[0045] The motor in this example includes three-phase sub-windings, specifically a U-phase winding, a V-phase winding, and a W-phase winding. The three-phase sub-windings are wound in the same way and are arranged rotationally symmetrically along the axis of the stator core 1. Each phase sub-winding differs from the others by 2 stator slots or 4M stator slots, where M is a positive integer. In this embodiment, each phase sub-winding differs from the others by 4 stator slots. Each phase sub-winding includes two parallel branches. Taking the U-phase winding 21 as an example, the U-phase winding 21 includes a first branch 211a and a second branch 211b connected in parallel. The first branch 211a and the second branch 211b are arranged rotationally symmetrically along the axis of the stator core 1. The input and output ends of the first branch 211a and the second branch 211b are located on the same layer. In this example, the input and output ends are both located on the 6th layer, that is, on the side closest to the axis of the stator core 1. Figure 5aAs shown in the figure, it is the winding diagram of the first branch 211a of the U-phase winding 21, U1 is defined as the leading end of the first branch 211a, which is arranged in the No. 6 layer and the No. 2 slot; X1 is defined as the trailing end of the first branch 211a, which is arranged in the No. 6 layer and the No. 7 slot; as shown in the figure, Figure 5b As shown in the figure, it is the winding diagram of the second branch 211b of the U-phase winding 21, U2 is defined as the leading end of the second branch 211b, which is arranged in the No. 6 layer and the No. 1 slot, X2 is defined as the trailing end of the second branch 211b, which is arranged in the No. 6 layer and the No. 44 slot; the leading end and the trailing end of each branch are spaced by 4 stator slots 11; this arrangement can make the outgoing wire position concentrated, which is convenient for connecting with the bus bar or the copper bar.

[0046] For the convenience of understanding, as shown in the figure, Figure 3 The starting position of the specific stator slot 11 is defined, the stator core 1 of the embodiment is provided with 48 stator slots 11, which are numbered clockwise along the circumference of the stator core 1, the number represents the number of the stator slot 11 where the plug-in section of the conductor 3 is located; as shown in the figure, Figure 4 The arrow points to the center of the stator core 1, and the numbering is carried out from the direction farthest from the center to the inside, L1 represents the number of the layer where the conductor 3 is located in the stator slot 11; as shown in the figure, 2L2 represents that one plug-in section of the first hairpin line 31 is located at the position of the second layer in the second stator slot 11, it should be noted that the starting position of each branch 211 can be selected in any stator slot 11, and the embodiment is only given for illustration. Among them, the bracket () represents the position of the two plug-in sections of one hairpin line.

[0047] As shown in the figure, Figure 5a The winding mode of the first branch 211a of the U-phase winding 21 is as follows:

[0048] (2L6-9L5)→(14L6-21L5)→(26L6-33L5)→(38L6-45L5)→(2L4-9L3)→(14L4-21L3)→(26L4-33L3)→(38L4-45L3)→(2L2-9L1)→(14L2-21L1)→(26L2-33L1)→(38L2-45L1)(2L1-43L2)→(38L1-31L2)→(26L1-19L2)→(14L1-7L2)→(2L3-43L4)→(38L3-31L4)→(26L3-19L4)→(14L3-7L4)→(2L5-43L6)→(38L5-31L6)→(26L5-19L6)→(14L5-7L6); wherein 2L6 is the leading end U1 of the first branch 211a, and 7L6 is the trailing end X1 of the first branch 211a. The first branch of the V-phase winding and the first branch of the W-phase winding can be obtained on the basis of Figure 5a .

[0049] As shown in Figure 5b , the winding mode of the second branch 211b of the U-phase winding 21 is as follows:

[0050] (1L6-8L5)→(13L6-20L5)→(25L6-32L5)→(37L6-44L5)→(1L4-8L3)→(13L4-20L3)→(25L4-32L3)→(37L4-44L3)→(1L2-8L1)→(13L2-20L1)→(25L2-32L1)→(37L2-44L1)(39L1-32L2)→(27L1-20L2)→(15L1-8L2)→(3L1-44L2)→(39L3-32L4)→(27L3-20L4)→(15L3-8L4)→(3L3-44L4)→(39L5-32L6)→(27L5-20L6)→(15L5-8L6)→(3L5-44L6); wherein, 1L6 is the introduction end U2 of the second branch 211b, and 44L6 is the outgoing end X2 of the second branch 211b. The second branch of the V-phase winding and the second branch of the W-phase can be obtained on the basis of Figure 5b .

[0051] In this example, the flat wire stator further comprises insulating paper, which is arranged inside the stator slot 11, specifically at the position between the winding 2 and the stator core 1, to avoid contact between the winding 2 and the stator core 1, thereby improving the insulation performance of the motor.

[0052] The application also provides a motor, as shown in Figure 9 , the motor comprises a rotating shaft 4, a rotor 5 sleeved on the rotating shaft 4 and fixedly connected with the rotating shaft 4, and a flat wire stator according to any one of the above, which is coaxially arranged with the rotor 5. The motor is used for driving a vehicle.

[0053] In the utility model, unless another definite provision and limitation, the terms "mount", "arrange", "connect", "fix" and so on should do the broad sense understanding, for example, can be fixed connection, also can be detachable connection, or be integrated;Can be mechanical connection, also can be electrical connection;Can be directly connected, also can be indirectly connected through the intermediate medium, can be the intercommunication of two elements or the interaction relationship of two elements. For the ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0054] In addition, the terms "first", "second", etc. are used only for descriptive purposes and do not connote or imply relative importance or an ordering between or among the indicated features. Thus, a feature described as "first" or "second" can be either implicitly or explicitly included in one or more other features. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly specified otherwise.

[0055] In the present application, unless otherwise explicitly specified and limited, the "on" or "under" of a first feature to a second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the "over", "above" and "on" of the first feature to the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0056] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples described in the present application.

[0057] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A flat wire stator, characterized by, The application relates to a stator core (1) and a winding (2) of the stator core (1). The stator core (1) has an inner surface near the axis of the stator core (1), and a plurality of stator slots are arranged through the stator core (1) along the axial direction of the stator core (1) and extend radially from the inner surface of the stator core (1). The winding (2) is arranged in the plurality of stator slots of the stator core (1), and 2N+2 layers are formed in the winding (2) along the radial direction of the stator core (1) in each stator slot (11) of the plurality of stator slots, wherein N is a positive integer. Each phase of the winding (2) comprises at least two parallel branches, and each of the at least two parallel branches is arranged in rotational symmetry around the axis of the stator core (1).

2. The flat wire stator of claim 1, wherein Each of the at least two parallel branches comprises a plurality of conductors (3) connected in series, and each of the plurality of conductors (3) spans two adjacent layers.

3. The flat wire stator of claim 1, wherein The number of slots per pole per phase is 2, and the conductors per pole per phase between adjacent layers of the plurality of stator slots are staggered by one stator slot (11) along the circumferential direction of the stator core (1).

4. The flat wire stator of claim 3, wherein, The plurality of conductors (3) comprises a plurality of first hairpin wires (31) connected in series, a plurality of second hairpin wires (32) connected in series with the first hairpin wires (31), and a plurality of third hairpin wires (33).

5. The flat wire stator of claim 1, wherein, The introduction end and the outgoing end of each of the at least two parallel branches are arranged on one side of the welding end (2a).

6. The flat wire stator of claim 5, wherein, Each of the at least two parallel branches forms 2N+2 turns in the stator core (1), wherein N is a positive integer.

7. The flat wire stator of claim 6, wherein, Each of the at least two parallel branches forms continuous N+1 turns in the same direction in the stator core (1) and continuous N+1 turns in the opposite direction. The plurality of conductors (3) are arranged between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots. The plurality of conductors (3) are arranged between the 2Nth layer and the 2N-1th layer of the plurality of stator slots. The plurality of conductors (3) are arranged between the 2th layer and the 1th layer of the plurality of stator slots.

8. The flat wire stator of claim 7, wherein, The plurality of conductors (3) are arranged in the same direction in a circle between the 2N+2th layer and the 2N+1th layer of the plurality of stator slots, in a circle between the 2Nth layer and the 2N-1th layer, and so on until a circle between the 2th layer and the 1th layer; and in the opposite direction, a circle between the 1th layer and the 2th layer, a circle between the 3th layer and the 4th layer, and so on until a circle between the 2N+1th layer and the 2N+2th layer.

9. The flat wire stator of claim 1, wherein, The winding (2) comprises three-phase sub-windings, and the lead-in ends of each phase sub-winding are different by 4M stator slots, M being a positive integer.

10. An electric machine characterized by The motor comprises: a rotating shaft (4); a rotor (5) sleeved on the rotating shaft (4); and The flat wire stator of any one of claims 1-9 is coaxially arranged with the rotor (5).

Images