Flat wire stator and motor

Abstract

The invention 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 present invention relates to the technical field of motors, and specifically to a flat wire stator and a motor. Background Art

[0002] In recent years, due to advantages such as high slot fill factor, good heat dissipation effect, and low winding end height, flat wire motors have been increasingly applied in the field of new energy vehicles. Compared with traditional round wire motors, the peak and continuous power of flat wire motors have been greatly improved. A flat wire motor includes a rotor and a flat wire stator, and the flat wire stator includes an iron core, insulating paper, and a flat wire winding. The flat wire winding is formed by connecting and welding hairpin coils inserted into the iron core slots. Its composition structure and connection sequence have an important impact on aspects such as the performance and process of the flat wire motor. The fewer the types of hairpin coil structures used, the lower the production process difficulty and the higher the production efficiency. The more types of hairpin coil structures used, the lower the production efficiency. In the existing design of flat wire stator windings, the winding scheme design mostly uses multiple span hairpin coils for connection, resulting in a large number of wire shapes and a high end height, thus leading to high production process difficulty, low production efficiency, and high cost. Moreover, the stator winding mainly adopts an in-slot distribution structure with the same phase in the same slot, resulting in a high harmonic content in the winding, and there are lead-out wires on both the inner and outer layers of the stator winding, leading to a complex structure design, large volume, and increased cost of the bus bar. Summary of the Invention

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

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

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

[0006] Optionally, the conductor includes 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 first hairpin wire, the second hairpin wire, and the third hairpin wire have the same pitch; the first hairpin wire includes a twisted section, and the twisted section extends axially from one end of the stator core to form a welding end. In some embodiments, after inserting a plurality of conductors into a plurality of stator slots, the part extending out of the stator core is twisted to form a twisted section, and the twisting direction can be determined according to the actual situation; since the three hairpin wires have the same pitch and the same shape of the crown end, the types of conductor wire shapes are reduced, the winding laying method is simplified, and the process difficulty is reduced.

[0007] Optionally, the leading end and the trailing end of each branch are both arranged on one side of the welding end; and the leading end and the trailing end of each branch are arranged in the innermost layer close to the axis of the stator core of the plurality of stator slots. The outgoing positions of the winding are concentrated, which is convenient for the design of the outgoing copper bars or busbars.

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

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

[0010] Optionally, two turns are arranged between the 2N + 2nd layer and the 2N + 1st layer of the plurality of stator slots by the plurality of conductors; two turns are arranged between the 2Nth layer and the 2N - 1st layer of the plurality of stator slots by the plurality of conductors; and so on, until two turns are arranged between the 2nd layer and the 1st layer of the plurality of stator slots. The winding laying method is simple, and the assembly efficiency is improved.

[0011] Optionally, the plurality of conductors are arranged in one turn between the 2N + 2nd layer and the 2N + 1st layer of the plurality of stator slots in the same direction, one turn between the 2Nth layer and the 2N - 1st layer, and so on, until one turn is arranged between the 2nd layer and the 1st layer; then in the opposite direction, one turn is arranged between the 1st layer and the 2nd layer, one turn between the 3rd layer and the 4th layer, and so on, until one turn is arranged between the 2N + 1st layer and the 2N + 2nd layer. The winding laying method is simple, and the assembly efficiency is improved.

[0012] Optionally, the winding includes three-phase sub-windings, and the leading ends of each phase of sub-windings are separated by 4M stator slots, where M is a positive integer. This makes the outgoing line positions of the winding concentrated, facilitating the design of lead copper bars or busbars.

[0013] An electric motor, comprising a rotating shaft; a rotor sleeved on the rotating shaft; and the flat wire stator according to any one of the above, wherein the flat wire stator is coaxially arranged with the rotor. The electric motor is used to drive a vehicle. Description of the Drawings

[0014] Other features and advantages of the present invention are described below, which explains the present invention in more detail based on the embodiments in conjunction with the drawings.

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

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

[0017] Figure 3 is an axial schematic diagram of the stator core of the present invention;

[0018] Figure 4 is a partial schematic diagram when the stator core is filled with conductors of the present invention;

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

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

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

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

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

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

[0025] Among them, the main reference signs in the drawings are as follows:

[0026] 1 - Stator core, 11 - Stator slot, 2 - Winding, 2a - Welded end, 2b - Crown end, 21 - Phase-U 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 segment, 311a, 321a, 331a - Left insertion segment, 311b, 321b, 331b - Right insertion segment, 313, 323, 333 - Connection segment, 312, 322, 332 - Twisting segment, 312a, 322a, 332a - Left twisting segment, 312b, 322b, 332b - Right twisting segment, 4 - Rotating shaft, 5 - Rotor Detailed implementation mode

[0027] The preferred implementation mode of the present invention will be described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left", "right", "front", "rear" and similar expressions used herein are for illustrative purposes only and do not limit the present invention.

[0028] A flat wire stator includes a stator core 1, the stator core 1 is provided with a plurality of stator slots, the plurality of stator slots axially penetrate the stator core 1 along the axis of the stator core 1, and the plurality of stator slots are arranged in a circumferential array along 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 inside each of the plurality of stator slots, where N is a positive integer; the winding 2 includes M phase sub-windings, where M is a positive integer; each phase of the sub-winding includes 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 includes a plurality of serially connected conductors 3, and each of the plurality of conductors 3 straddles two adjacent layers; the pitches of the plurality of conductors 3 are the same.

[0029] As Figures 1 to 3 shown, the stator core 1 of this embodiment has a hollow cylindrical structure. The stator core 1 has an inner surface close to the center of the stator core 1 along the radial direction. The stator core 1 is axially provided with a plurality of stator slots 11 penetrating the stator core 1, and the plurality of stator slots 11 are arranged in a circumferential array along the stator core 1. The plurality of stator slots 11 extend radially from the inner surface of the stator core 1. The stator core 1 of this example 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 from any stator slot 11. This example only gives an illustration of one embodiment; as Figure 1As shown, the winding 2 is formed by winding a plurality of conductors 3 in a plurality of stator slots 11. In this example, the cross-section of the conductor 3 is rectangular, that is, a flat wire winding, which is convenient for improving 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 to form 2N + 2 layers along the radial direction of the stator core, where N is a positive integer. In this example, the winding 2 forms 6 layers in the plurality of stator slots 11. For ease of understanding, from the end farthest from the axis of the stator core 1 towards the axis, they are sequentially defined as the first layer, the second layer, the third layer, the fourth layer, the fifth layer, and the sixth layer.

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

[0031] In some embodiments, each of at least two parallel branches forms N + 1 consecutive turns in the same direction on the stator core 1, and then forms N + 1 consecutive turns in the opposite direction.

[0032] The winding 2 of this embodiment includes three-phase sub-windings. Each phase's sub-winding includes two parallel branches, and the two parallel branches are rotationally symmetrically distributed around the axis of the stator core 1; each branch includes a plurality of serially connected conductors 3, and the plurality of conductors 3 are serially connected on the stator core 1 to form 6 turns along the circumferential direction; among them, three turns are arranged in one direction and three turns are arranged in the opposite direction; as Figure 2 and Figure 5a shown, taking the U-phase winding 21 as an example in this example, the first branch 211a of the U-phase winding 21 is wound 3 turns in the clockwise direction along the circumferential direction of the stator core 1 and 3 turns in the counterclockwise direction along the circumferential direction of the stator core 1.

[0033] In some embodiments, two turns are arranged between the 2N + 2 layer and the 2N + 1 layer of the plurality of stator slots 11 for the plurality of conductors 3; two turns are arranged between the 2N layer and the 2N - 1 layer of the plurality of stator slots 11 for the plurality of conductors 3; and so on, until two turns are arranged between the 2nd layer and the 1st layer of the plurality of stator slots 11.

[0034] In some embodiments, the plurality of conductors 3 are arranged in the same direction to form one turn between the 2N + 2 layer and the 2N + 1 layer of the plurality of stator slots 11, one turn between the 2N layer and the 2N - 1 layer, and so on, until one turn is arranged between the 2nd layer and the 1st layer; then in the opposite direction, one turn is arranged between the 1st layer and the 2nd layer, one turn between the 3rd layer and the 4th layer, and so on, until one turn is arranged between the 2N + 1 layer and the 2N + 2 layer.

[0035] In each branch of each phase's sub-winding in this example, the plurality of conductors 3 are serially connected and arranged in one clockwise turn between the 6th layer and the 5th layer of the plurality of stator slots 11. Taking the U-phase winding 21 as an example in this application, as Figure 5aAs shown, it is the winding diagram of the first branch 211a of the U-phase winding. The leading end of the first branch 211a is arranged in slot No. 2 of the 6th layer, and then it enters slot No. 9 of the 5th layer, slot No. 14 of the 6th layer, slot No. 21 of the 5th layer, slot No. 21 of the 6th layer, slot No. 26 of the 6th layer, slot No. 33 of the 5th layer, slot No. 38 of the 6th layer, and slot No. 45 of the 5th layer in sequence. This is a circle arranged between the 6th layer and the 5th layer. The last conductor 3 of the branch between the 6th layer and the 5th layer twists to the 4th layer, and then a circle is arranged between the 4th layer and the 3rd layer in the clockwise direction in the same way; then a circle is arranged between the 2nd layer and the 1st layer in the clockwise direction in the same way; when winding clockwise from the 6th layer to the 1st layer, it changes direction and arranges a circle between the 1st layer and the 2nd layer in the counterclockwise direction, as Figure 5a shown. The first conductor wound counterclockwise is in series with the last conductor wound clockwise. When winding counterclockwise, it starts from slot No. 2 of the 1st layer, and then enters slot No. 43 of the 2nd layer, slot No. 38 of the 1st layer, slot No. 31 of the 2nd layer, slot No. 26 of the 1st layer, slot No. 19 of the 2nd layer, slot No. 14 of the 1st layer, slot No. 7 of the 2nd layer in sequence, and then enters slot No. 2 of the 3rd layer, switches to the 3rd layer and the 4th layer, and arranges a circle in the counterclockwise direction in the same way; then a circle is arranged between the 5th layer and the 6th layer in the counterclockwise direction in the same way, and finally leads out from slot No. 7 of the 6th layer. Only one embodiment is given in this application, and the winding direction of each branch is not specifically limited. In another embodiment, it is also wound counterclockwise between the 6th layer and the 1st layer and 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 pole per phase is 2, and the conductors 3 between adjacent layers of the multiple stator slots 11 per pole per phase are staggered by one stator slot 11 along the circumferential direction of the stator core 1.

[0037] The number of poles of the motor in this embodiment is 8; the number of poles refers to the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, the number of magnetic poles appears in pairs. Generally, 1 N pole and 1 S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1. The number of slots per pole per phase in this example is 2. The number of slots per pole per phase refers to the number of slots occupied by each phase sub-winding under each magnetic pole, as Figure 5aAs shown, taking one pole number of the U-phase winding 21 as an example, the conductors located in the 1st layer, 3rd layer, and 5th layer are arranged in slots 2 and 3, and the conductors located in the 2nd layer, 4th layer, and 6th layer are arranged in slots 1 and 2. That is, the U-phase winding 21 occupies 2 stator slots under each magnetic pole, and the conductors 3 between each adjacent layer are staggered by one stator slot 11 along the circumferential direction of the stator core 1; this makes the winding 2 formed by each pole per phase have an asymmetric structure; the winding method of the winding 2 of each pole is the same. According to this rule, the positions of the remaining windings 2 of each pole can be determined, making the sub-windings of each phase form a structure with the same slot but different phases. This setting 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 include 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 section 311, and the twisted section 311 extends axially out of one end 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 in at least two branches are both arranged on one side of the welding end 2a; the leading end and the trailing end of each branch in at least two branches are arranged in the innermost layer close to the axis of the stator core 1 among a plurality of stator slots.

[0040] As Figure 6 shown, the conductor 3 includes a first hairpin wire 31. The first hairpin wire 31 includes a left insertion section 311a accommodated inside the stator core 1 and a right insertion section 311b parallel to the left insertion section 311a. The left insertion section 311a and the right insertion section 311b are arranged in adjacent layers. Taking one of the first hairpin wires 31 in the first branch of the U-phase winding as an example, the left insertion section 311a of the first hairpin wire 31 is accommodated in slot 14 of the 6th layer, and the right insertion section 311b of the first hairpin wire 31 is accommodated in slot 21 of the 5th layer; the lower end of the left insertion section 311a is bent in a direction away from the right insertion section 311b to form a left twisted section 312a, and the lower end of the right insertion section 311b is bent in a direction away from the left insertion section 311a to form a right twisted section 312b; the left twisted section 312a and the right twisted section 312b extend axially out of one end of the stator core 1 to form a welding end 2a; the hairpin wire 31 further includes a connection section 313. The left end of the connection section 313 is connected to the upper end of the left insertion section 311a, and the right end of the connection section 313 is connected to the upper end of the right insertion section 311b. The connection section 313 extends axially out of the other end of the stator core 1 to form a crown end 2b; the crown end 2b and the welding end 2a are respectively located on both axial sides of the stator core 1.

[0041] The conductor 3 further includes a second hairpin wire 32. AsFigure 6 and Figure 7 As shown in Figure 7 , the second hairpin wire 32 and the first hairpin wire 31 are bent in the same direction, both bending towards the axis of the stator core 1, so as to form a circular winding 2 along the stator core 1; the pitches of the second hairpin wire 32 and the first hairpin wire 31 are the same, and the pitch is 7 in this example; the pitch refers to the number of stator slots spanned between the two insertion segments of a single hairpin wire; for example, if the pitch is 8, that is, one insertion segment of the hairpin wire 31 is embedded in the first slot and the other insertion segment is embedded in the ninth slot, and the distance between the center lines of the two stator slots where the two insertion segments are located is 8 slots (the first slot and the ninth slot are each counted as half a slot). The insertion segment 321 and the connecting segment 323 of the second hairpin wire 32 have the same shape as the insertion segment 311 and the connecting segment 313 of the first hairpin wire 31, and the bending directions of the twisting segments 322 of the second hairpin wire 32 and the twisting segments 312 of the first hairpin wire 31 are the same. The difference is that the length of the straight segment in the vertical direction of the left twisting segment 322a of the second hairpin wire 32 is greater than the length of the straight segment in the vertical direction of the left twisting segment 312a of the first hairpin wire 31; the second hairpin wire 32 is arranged at the leading end and the trailing end of each branch 21, which is convenient for leading out the copper busbar or connecting with the busbar.

[0042] The conductor 3 further includes a third hairpin wire 33. The third hairpin wire 33 and the first hairpin wire 31 are bent in the same direction, both bending towards the axis of the stator core 1, so as to form a circular winding 2 along the stator core 1; the pitches of the third hairpin wire 33 and the first hairpin wire 31 are the same, and the pitch is 7 in this example; as Figure 6 and Figure 8As shown, the insertion section 331 and the connection section 333 of the third hairpin wire 33 have the same shape as the insertion section 311 and the connection section 313 of the first hairpin wire 31. The difference is that the left torsion section 332a and the right torsion section 332b of the third hairpin wire 33 have the same torsion direction. In this example, both the left torsion section 332a and the right torsion section 332b of the third hairpin wire 33 are torsion to the left; each branch 211 of each phase sub-winding 21 includes a third hairpin wire 33, and the third hairpin wire 33 is used to achieve 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, in this example, it is clockwise. The right insertion section 311b of the last first hairpin wire 31 is arranged in the slot No. 45 of the first layer, and then a third hairpin wire 33 is connected. The right insertion section 331b of the third hairpin wire 33 is arranged in the slot No. 2 of the first layer. The right torsion section 312b of the last first hairpin wire 31 wound clockwise is connected to the right torsion section 332b of the third hairpin wire 33. The left insertion section 331a of the third hairpin wire 33 is arranged in the slot No. 43 of the second layer, and then the first hairpin wire 31 is connected. The right torsion section 312b of the first hairpin wire 31 is connected to the left torsion section 332a of the third hairpin wire 33. The first hairpin wire 31 is wound counterclockwise in turn in the same way, thus realizing the commutation of the first branch 211a.

[0043] In this embodiment, after multiple conductors 3 are inserted into multiple stator slots 11, the insertion section part extending out of the stator core 1 can be twisted to form a torsion section. The torsion direction is as shown in the first hairpin wire 31, the second hairpin wire 32, and the third hairpin wire 33. The pitches of the three hairpin wires are the same, and the winding method is simple, reducing the process difficulty and improving the production efficiency.

[0044] In some embodiments, the winding 2 includes three-phase sub-windings, and the difference between the leading ends of each phase sub-winding is 4M stator slots 11, where M is a positive integer.

[0045] The motor in this example includes three-phase sub-windings, specifically the U-phase winding, the V-phase winding, and the W-phase winding. The winding methods of the three-phase sub-windings are the same. The three-phase sub-windings are rotationally symmetrically arranged along the axis of the stator core 1. The difference between each phase sub-winding is 2 stator slots or 4M stator slots, where M is a positive integer. In this embodiment, the difference between each phase sub-winding is 4 stator slots; each phase sub-winding includes two parallel branches. Taking the U-phase winding 21 as an example in this application, the U-phase winding 21 includes the first branch 211a and the second branch 211b in parallel. The first branch 211a and the second branch 211b are rotationally symmetrically arranged along the axis of the stator core 1. The leading ends and the trailing ends of the first branch 211a and the second branch 211b are arranged on the same layer. In this example, both the leading ends and the trailing ends are arranged on the sixth layer, that is, on the side close to the axis of the stator core 1; as Figure 5aAs shown, it is the winding diagram of the first branch 211a of the U-phase winding 21. U1 is defined as the lead-in end of the first branch 211a, and the lead-in end is arranged in slot No. 2 of the 6th layer; X1 is defined as the lead-out end of the first branch 211a, and the lead-out end is arranged in slot No. 7 of the 6th layer; as Figure 5b As shown, it is the winding diagram of the second branch 211b of the U-phase winding 21. U2 is defined as the lead-in end of the second branch 211b, and the lead-in end is arranged in slot No. 1 of the 6th layer. X2 is defined as the lead-out end of the second branch 211b, and the lead-out end is arranged in slot No. 44 of the 6th layer; the lead-in end and the lead-out end of each branch are separated by 4 stator slots 11; this setting method can make the outgoing line positions concentrated, which is convenient for leading out copper bars or connecting with busbars.

[0046] For easy understanding, as Figure 3 As shown, the starting positions of the specific stator slots 11 are defined. The stator core 1 of this embodiment is provided with 48 stator slots 11, which are sequentially numbered clockwise along the circumferential direction of the stator core 1, and the numbers represent the numbers of the stator slots 11 where the insertion segments of the conductors 3 are located; as Figure 4 As shown, the arrow points to the center of the stator core 1, and the numbers are sequentially numbered inward from the direction farthest from the center. L1 represents the number of the layer where the conductor 3 is located in the stator slot 11; for example, 2L2 means that an insertion segment of the first hairpin wire 31 is located at the position of the 2nd layer in the 2nd stator slot 11. It should be noted that the starting position of each branch 211 can be selected from any stator slot 11, and only one embodiment is given in this example. Among them, the positions in the brackets () represent the positions of the two insertion segments of a hairpin wire.

[0047] As Figure 5a As shown, the winding method 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); among them, 2L6 is the lead-in end U1 of the first branch 211a, and 7L6 is the lead-out 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 by array on the basis of Figure 5a this.

[0049] As shown Figure 5b in the figure, the winding method 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); where 1L6 is the leading end U2 of the second branch 211b, and 44L6 is the trailing end X2 of the second branch 211b. The second branches of the V-phase winding and the W-phase winding can be obtained by arraying on the basis of Figure 5b this.

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

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

[0053] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "setting", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality of" means two or more unless otherwise specifically defined.

[0055] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may 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 first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher level height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower level height than the second feature.

[0056] In the description of this specification, the description with reference to terms such as "an embodiment", "some embodiments", "example", "specific example", or "some examples", etc. 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 invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification.

[0057] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this application.

Claims

1. A flat wire stator, characterized in that, Comprising: A stator core (1), the stator core (1) being a hollow columnar structure, the stator core (1) having an inner surface near its axis, the stator core (1) being provided with a plurality of stator slots, the plurality of stator slots penetrating the stator core (1) along the axial direction of the stator core (1), the plurality of stator slots extending radially from the inner surface of the stator core (1), and the plurality of stator slots being arranged in a circumferential array along the stator core (1); And A winding (2), the winding (2) being inserted into the plurality of stator slots of the stator core (1), the winding (2) forming 2N + 2 layers along the radial direction of the stator core (1) inside each of the plurality of stator slots (11), where N is a positive integer; the winding (2) includes M phase sub-windings, where M is a positive integer; each phase of the sub-winding includes 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 includes a plurality of series-connected conductors (3), and each of the plurality of conductors (3) spans two adjacent layers; the pitches of the plurality of conductors (3) are the same.

2. The flat wire stator according to claim 1, characterized in that, The number of slots per pole per phase is 2, and the conductors between adjacent layers of the plurality of stator slots for each pole per phase are staggered by one stator slot (11) along the circumferential direction of the stator core (1).

3. The flat wire stator according to claim 1, wherein The plurality of conductors (3) includes a plurality of series-connected first hairpin wires (31), a second hairpin wire (32) connected in series with the first hairpin wire (31), and a third hairpin wire (33), and 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 section (311), and the twisted section (311) extends along the axial direction of the stator core (1) to form a welding end (2a) at one end of the stator core.

4. The flat wire stator according to claim 3, wherein The leading end and the trailing end of each of the at least two parallel branches are provided on one side of the welding end (2a); the leading end and the trailing end of each of the at least two parallel branches are provided in the innermost layer close to the axis of the stator core (1) of the plurality of stator slots.

5. The flat wire stator according to claim 1, characterized in that, Each of the at least two parallel branches forms 2N + 2 turns on the stator core (1), where N is a positive integer.

6. The flat wire stator according to claim 5, wherein Each of the at least two parallel branches forms N + 1 consecutive turns in the same direction on the stator core (1), and then forms N + 1 consecutive turns in the opposite direction.

7. The flat wire stator according to claim 6, wherein The plurality of conductors (3) are arranged in two turns between the 2N + 2nd layer and the 2N + 1st layer of the plurality of stator slots; the plurality of conductors (3) are arranged in two turns between the 2Nth layer and the 2N - 1st layer of the plurality of stator slots; and so on, until two turns are arranged between the 2nd layer and the 1st layer of the plurality of stator slots.

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

9. The flat wire stator according to claim 1, wherein, The winding (2) includes three-phase sub-windings, and the difference between the leading ends of each phase sub-winding is 4M stator slots, where M is a positive integer.

10. A motor, characterized in that, The motor includes: a rotating shaft (4); a rotor (5), the rotor (5) being sleeved on the rotating shaft (4); and the flat wire stator according to any one of claims 1-9 above, the flat wire stator being coaxially arranged with the rotor (5).

Images