Winding structure based on flat wire conductor

Abstract

The utility model belongs to the technical field of flat wire motors, and provides a winding structure based on a flat wire conductor, which comprises a stator core and a three-phase coil, wherein the inner surface of the stator core is provided with a plurality of stator slots, the three-phase coils are installed in the stator slots, the three-phase coils are divided into n layers from the slot bottoms of the stator slots to slot openings, and n is greater than 1; the three-phase leading-out ends of the other three-phase coils are located on the ith layer, n > = i > = 1, the neutral ends are located on the jth layer, n > = j > = 1, and j is not equal to i; the three-phase leading-out end is connected with a leading-out assembly, and the neutral end is connected with a neutral bar. According to the utility model, the position layout of the three-phase leading-out terminals and the neutral terminals is adopted, so that current inflow and outflow paths are spatially separated, the neutral terminals and the three-phase leading-out terminals form a natural shielding layer, electromagnetic radiation generated by high-frequency harmonic waves is reduced, and the three-phase leading-out terminals are intensively arranged in the middle layer, so that excessive concentration of a high-current-density area is avoided; and the local temperature rise condition is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of flat wire motor technology, and specifically relates to a winding structure based on flat wire conductors. Background Technology

[0002] Currently, the requirements for the number of layers, parallel branches, and winding configurations of flat-wire motors are becoming increasingly stringent. Existing flat-wire motor stator windings (using flat-wire conductors) are mostly full-pitch windings. Full-pitch flat-wire motors have high harmonic winding coefficients, resulting in significant torque fluctuations during operation, which worsens the motor's noise, vibration, and harshness (NVH) performance, thus reducing its overall performance. Therefore, by setting the stator windings to short-pitch windings to reduce the harmonic winding coefficient of flat-wire motors, the noise, vibration, and harshness (NVH) performance of electric vehicles can be improved.

[0003] However, existing flat wire short-pitch windings with balanced multi-branch circuits have complex structures, which makes winding processing difficult and winding difficult. Furthermore, the short-pitch setting method is limited by the winding form, making it difficult to obtain a high fundamental winding coefficient while weakening the harmonic winding coefficient, thus reducing the performance of the flat wire motor. Utility Model Content

[0004] To address the problems in the background art, this utility model proposes a winding structure based on flat wire conductors.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A winding structure based on flat wire conductors, comprising a stator core and three-phase coils;

[0007] The inner surface of the stator core is provided with a plurality of stator slots;

[0008] The three-phase coils are installed in the stator slots, and the three-phase coils are divided into n layers from the bottom of the stator slot to the slot opening, where n > 1;

[0009] The three-phase leads of the three-phase coil are located in the i-th layer, where n≥i≥1;

[0010] The neutral terminal of the three-phase coil is located in the j-th layer, where n≥j≥1 and j≠i;

[0011] The three-phase leads are connected to lead-out components, and the neutral lead is connected to a neutral busbar.

[0012] Preferably, the three-phase coil includes a U-phase coil, a V-phase coil, and a W-phase coil that are symmetrically distributed at 120°.

[0013] The U-phase coil, V-phase coil, and W-phase coil are each equipped with several parallel branch coils;

[0014] The starting point of each branch coil is connected to the lead-out assembly as a three-phase lead-out terminal, and the ending point is connected to the neutral bus as a neutral terminal.

[0015] Preferably, the branch coil includes a lead-out hairpin, a U-shaped hairpin, and a reverse twist hairpin;

[0016] Along the direction of current flow, the hairpin is led out as the starting point of the branch coil and connected in series with the U-shaped hairpin and the reverse twist hairpin across the layers until it crosses the layers to the 1st or nth layer to form the first branch coil.

[0017] In the first branch coil, if the lead-out hook is located in the second layer, then the reverse twist hook is located in the nth layer; if the lead-out hook is located in the (n-1)th layer, then the reverse twist hook is located in the first layer.

[0018] Along the current direction, the first U-shaped hairpin is connected in series with the next U-shaped hairpin and the next anti-twist hairpin across layers until it is connected across layers to the 1st or nth layer, forming the second branch coil;

[0019] In the second branch coil, if the first U-shaped hairpin is located in the second layer, then the reverse twist hairpin is located in the nth layer; if the first U-shaped hairpin is located in the (n-1)th layer, then the reverse twist hairpin is located in the first layer.

[0020] In the branch coil, the first branch coil is connected in series with several second branch coils until the final anti-torsion hairpin is located in the adjacent layer of the hairpin.

[0021] Preferably, the lead-out card includes a first U-shaped conductor, a first welding section, and a lead-out section;

[0022] The first U-shaped conductor is U-shaped;

[0023] The first welding segment is connected to one end of the first U-shaped conductor;

[0024] The lead-out section is connected to the other end of the first U-shaped conductor, and the lead-out section is used to connect to the lead-out assembly;

[0025] The first welding section and the lead-out section are arranged opposite to each other at the U-shaped opening of the first U-shaped conductor.

[0026] Preferably, the U-shaped hairpin includes a second U-shaped conductor and symmetrical second welding segments facing opposite directions;

[0027] The second U-shaped conductor is U-shaped;

[0028] The symmetrical and oppositely oriented second welding segments are respectively connected to the two U-shaped openings of the second U-shaped conductor.

[0029] Preferably, the reverse twist hairpin includes a third U-shaped conductor and a third welding segment facing the same direction;

[0030] The third U-shaped conductor is U-shaped;

[0031] The third welding segments, which are oriented in the same direction, are respectively connected to the two U-shaped openings of the third U-shaped conductor.

[0032] Preferably, in the branch coil:

[0033] A hairpin and a U-shaped hairpin are connected by lap welding of a first welding segment and a second welding segment;

[0034] The two U-shaped hairpins are lap-welded together by a second welding segment of the first U-shaped hairpin and a second welding segment of the second U-shaped hairpin;

[0035] The U-shaped hairpin and the reverse twist hairpin are welded together by the second welding section and the third welding section.

[0036] Preferably, the lead-out component includes:

[0037] The connecting shell is arc-shaped;

[0038] The first lead-out line is connected to the first lead-out row;

[0039] The first lead-out bar is provided with several solder feet that are connected to the three-phase lead-out terminals;

[0040] The second lead is connected to the second lead-out row;

[0041] The second lead-out bar is provided with several solder feet that connect to the three-phase lead-out terminals;

[0042] The third lead-out line is connected to the third lead-out row;

[0043] The third lead-out bar is provided with several solder feet that are connected to the three-phase lead-out terminals;

[0044] The first lead-out bar, the second lead-out bar, and the third lead-out bar are mutually insulated and are all installed inside the connecting housing.

[0045] Preferably, the arc-shaped surface of the connecting housing is further provided with a plurality of locking blocks;

[0046] The surface of the locking block facing the connecting housing abuts against the surface of the neutral bar away from the connecting housing, thereby restricting the radial movement of the neutral bar along the stator core.

[0047] Preferably, the neutral bar is arc-shaped, and the neutral bar is provided with a plurality of solder feet connected to the neutral end.

[0048] The beneficial effects of this utility model are:

[0049] 1. This utility model adopts the position layout of the three-phase lead-out terminals and the neutral terminal, so that the current inflow and outflow paths are spatially separated, effectively suppressing electromagnetic coupling interference between windings. At the same time, the neutral terminal and the three-phase lead-out terminals form a natural shielding layer, reducing electromagnetic radiation generated by high-frequency harmonics. Secondly, the three-phase lead-out terminals are concentrated in the middle layer to avoid excessive concentration in high current density areas and reduce local temperature rise.

[0050] 2. This utility model adopts the structure of the first branch coil and the second branch coil, and provides a three-branch parallel winding form, which can obtain a higher fundamental winding coefficient and improve the harmonic winding coefficient, and is beneficial to improving the performance of the flat wire motor.

[0051] 3. The lead-out assembly of this utility model replaces the traditional three-phase copper busbar structure. The structure of the first lead-out busbar, the second lead-out busbar and the third lead-out busbar are more simplified and integrated through the connecting housing. While ensuring the insulation effect between each lead-out busbar, it can also reduce the space occupied by the lead-out assembly at the end of the three-phase coil.

[0052] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained through the structures pointed out in the description and the accompanying drawings. Attached Figure Description

[0053] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 A schematic diagram of a winding structure based on a flat wire conductor according to this utility model is shown;

[0055] Figure 2 This diagram shows the structure of the first lead wire and the first lead bar of the present invention;

[0056] Figure 3 This invention provides a schematic diagram of the structure of the second lead wire and the second lead bar of the present invention.

[0057] Figure 4 A schematic diagram of the structure of the third lead and the third lead-out row of this utility model is shown;

[0058] Figure 5A schematic diagram of the lead-out assembly of this utility model (the first lead-out line, the second lead-out line, and the third lead-out line are not shown) is shown.

[0059] Figure 6 A schematic diagram of the connecting housing of this utility model is shown;

[0060] Figure 7 A schematic diagram of the structure of a single branch coil of this utility model is shown;

[0061] Figure 8 A schematic diagram of the structure of the ejector card of this utility model is shown;

[0062] Figure 9 A schematic diagram of the structure of the U-shaped hair clip of this utility model is shown;

[0063] Figure 10 A schematic diagram of the anti-twist hair clip of this utility model is shown;

[0064] Figure 11 The diagram shows the path of the alternating current in the three-phase coil of this invention within the stator slots;

[0065] Figure 12 The layout of the stator slot hairpin of this utility model is shown. Figure 1 ;

[0066] Figure 13 The layout of the stator slot hairpin of this utility model is shown. Figure 2 ;

[0067] Figure 14 The layout of the stator slot hairpin of this utility model is shown. Figure 3 ;

[0068] Figure 15 The diagram shows the unfolded view of the unidirectional coil of this invention.

[0069] In the diagram: 1. Stator core; 2. Three-phase coil; 3. Lead-out assembly; 301. First lead-out wire; 302. First lead-out busbar; 3021. First lead-out copper busbar; 3022. First lap busbar; 3023. First solder joint; 303. Second lead-out wire; 304. Second lead-out busbar; 3041. Second lap busbar; 3042. Second solder joint; 305. Third lead-out wire; 306. Third lead-out busbar; 3061. Second lead-out copper busbar; 3062, Third lap busbar; 3063, Third weld foot; 307, Connecting housing; 3071, Locking block; 4, Neutral busbar; 5, Lead-out clip; 501, First U-shaped conductor; 502, First welding section; 503, Lead-out section; 6, U-shaped clip; 601, Second U-shaped conductor; 602, Second welding section; 7, Reverse twist clip; 701, Third U-shaped conductor; 702, Third welding section. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0071] A winding structure based on flat wire conductors includes a stator core 1 and three-phase coils 2. Several stator slots are formed on the inner surface of the stator core 1. The three-phase coils 2 are embedded in the stator slots using a multi-layer lap winding process, and the three-phase coils 2 are divided into n layers from the bottom to the top of the slot, where n is greater than 1. Simultaneously, the three-phase leads (where current flows in) of the three-phase coils 2 are located in the i-th layer, where n ≥ i ≥ 1, and the neutral end (where current flows out) of the three-phase coils 2 is located in the j-th layer, where n ≥ j ≥ 1 and j ≠ i. Then, the three-phase leads are connected to lead-out components 3, and the neutral end is connected to a neutral busbar 4.

[0072] It should be noted that the staggered layout of the input and output of the i-th and j-th layers in the above structure creates spatial separation of the current inflow and outflow paths, effectively suppressing electromagnetic coupling interference between windings. Simultaneously, the neutral terminals of adjacent layers and the three-phase leads form a natural shielding layer, reducing electromagnetic radiation generated by high-frequency harmonics. Furthermore, the three-phase leads are concentrated in the i-th layer to avoid excessive concentration in high-current-density areas, thus reducing localized temperature rise.

[0073] As a preferred embodiment, the three-phase coil 2 includes a U-phase coil, a V-phase coil, and a W-phase coil symmetrically distributed at 120°. Each of the U-phase coil, V-phase coil, and W-phase coil has several parallel branch coils, preferably three branch coils. The starting point of each branch coil is connected to the lead-out assembly 3 as a three-phase lead-out terminal, and the ending point is connected to the neutral busbar 4 as a neutral terminal.

[0074] As a preferred solution, the following is combined with Figures 1-15 Introducing a winding structure based on flat wire conductors:

[0075] like Figure 1 As shown, in the winding structure of the flat wire motor, there are 54 stator slots and 6 layers of three-phase coil 2, with the slot opening as the first layer and the slot bottom as the sixth layer. In addition, the U-phase coil, V-phase coil, and W-phase coil are each equipped with three parallel branch coils. The lead-out assembly 3 is connected to the three-phase lead-out terminal located on the fifth layer, and the neutral bus 4 is connected to the neutral terminal located on the sixth layer.

[0076] Combination Figures 2 to 6It is known that the lead-out component 3 includes a first lead-out line 301, a first lead-out row 302, a second lead-out line 303, a second lead-out row 304, a third lead-out line 305, a third lead-out row 306, and a connecting housing 307.

[0077] like Figure 2 As shown, the first lead-out busbar 302 can be made of copper busbar, which consists of a first lead-out copper busbar 3021, a first lap busbar 3022, and a first solder foot 3023. The first lead-out copper busbar 3021 is embedded inside the connecting housing 307, while the first lap busbar 3022 and the three first solder feet 3023 (corresponding to the three branch coils) are located on both sides of the first lead-out copper busbar 3021 (obtained through a bending process, forming an integral structure with the first lead-out copper busbar 3021). Moreover, the first lap busbar 3022 can be welded to the first lead wire 301, and the first solder feet 3023 are welded to the three-phase lead-out terminals.

[0078] like Figure 3 As shown, the second lead-out bus 304 can be composed of a copper busbar, a second overlap busbar 3041, and several second solder feet 3042. The second overlap busbar 3041 and the second solder feet 3042 are bent relative to each other, and their connection position is embedded in the connecting housing 307. The second overlap busbar 3041 extends to the outside of the connecting housing 307 and is welded to the second lead-out wire 303. The second solder feet 3042 (three are provided, corresponding to the three branch coils) are welded to the three-phase lead-out terminals.

[0079] like Figure 4 As shown, the third lead-out bus 306 can be a copper busbar, which consists of a second lead-out copper busbar 3061, a third lap busbar 3062, and a third solder foot 3063. The second lead-out copper busbar 3061 is embedded inside the connecting housing 307, while the third lap busbar 3062 and the three third solder feet 3063 (corresponding to the three branch coils) are located on both sides of the second lead-out copper busbar 3061 (obtained through a bending process, forming an integral structure with the second lead-out copper busbar 3061). Furthermore, the third lap busbar 3062 can be welded to the third lead wire 305, and the third solder feet 3063 are welded to the three-phase lead-out terminals.

[0080] like Figure 5 As shown, the connecting housing 307 is arc-shaped; the first lead-out bar 302, the second lead-out bar 304, and the third lead-out bar 306 are mutually insulated and all are mounted on the connecting housing 307. (Combined) Figure 6 It is known that a locking block 3071 is also provided on the arc-shaped surface of the connecting housing 307. The surface of the locking block 3071 facing the connecting housing 307 abuts against the surface of the neutral busbar 4 away from the connecting housing 307. Therefore, the locking block 3071 can lock the neutral busbar 4, thereby restricting the neutral busbar 4 from moving radially along the stator core 1. Similarly, the neutral busbar 4 is arc-shaped and embedded in the locking block 3071, and nine welding feet connected to the neutral end are provided on one side.

[0081] It should be noted that the lead-out assembly 3 replaces the traditional three-phase copper busbar structure. The structure of the first lead-out busbar 302, the second lead-out busbar 304, and the third lead-out busbar 306 is more simplified and integrated through the connecting housing 307. While ensuring the insulation effect between each lead-out busbar, it can also reduce the space occupied by the lead-out assembly 3 at the end of the three-phase coil 2.

[0082] like Figure 7 As shown, the three-phase coil 2 has a total of nine branch coils, with three parallel branch coils for each phase. Each branch coil includes a lead-out hairpin 5, a U-shaped hairpin 6, and a reverse twist hairpin 7. These three types of hairpins can be combined with different spans.

[0083] For example, along the current flow direction, the lead-out hairpin 5 serves as the starting point of a branch coil, sequentially connecting U-shaped hairpins and anti-twist hairpins 7 across layers until reaching the 1st or nth layer, forming the first branch coil. Simultaneously, along the current direction, the U-shaped hairpin located in the (n-1)th or 2nd layer is sequentially connected in series with the next U-shaped hairpin and the next anti-twist hairpin 7 across layers until reaching the 1st or nth layer, forming the second branch coil. Within the branch coils, several second branch coils are sequentially connected in series with the first branch coil until the final anti-twist hairpin 7 is located in the layer adjacent to the lead-out hairpin 5.

[0084] It should be noted that the lead-out pin 5 can be located on any layer from 1 to 6, while the reverse twist pin 7 is located on layer 1 or 6. The last reverse twist pin 7 of the final branch coil can span across layers to the adjacent layer of the lead-out pin 5. Therefore, in the first branch coil, if the lead-out pin 5 is located on layer 2, then the reverse twist pin 7 is located on layer n; if the lead-out pin 5 is located on layer n-1, then the reverse twist pin 7 is located on layer 1. In the second branch coil, if the first U-shaped pin 6 is located on layer 2, then the reverse twist pin 7 is located on layer n; if the first U-shaped pin 6 is located on layer n-1, then the reverse twist pin 7 is located on layer 1.

[0085] like Figure 8 As shown, the lead-out card 5 mainly consists of a first U-shaped conductor 501, a first welding section 502, and a lead-out section 503. The first U-shaped conductor 501 has a U-shaped structure. The first welding section 502 is tightly connected to one end of the first U-shaped conductor 501. The lead-out section 503 is connected to the other end of the first U-shaped conductor 501, and its main function is to establish a connection with the lead-out assembly 3, thereby realizing related electrical conduction or signal transmission functions. In addition, the first welding section 502 and the lead-out section 503 are arranged in opposite directions at the U-shaped opening of the first U-shaped conductor 501 (specifically, they are first bent to both sides, and then bent vertically). This layout can effectively optimize the spatial structure of the lead-out card 5, reduce possible interference between parts, and ensure the stability and reliability of its overall performance.

[0086] like Figure 9 As shown, the U-shaped hairpin 6 includes a second U-shaped conductor 601 and symmetrical second welding sections 602 facing away from each other. The second U-shaped conductor 601 is U-shaped, and the symmetrical second welding sections 602 facing away from each other are respectively connected to the two U-shaped open ends of the second U-shaped conductor 601.

[0087] like Figure 10 As shown, the reverse twist hairpin 7 includes a third U-shaped conductor 701 and third welding sections 702 facing the same direction. The third U-shaped conductor 701 is U-shaped, and the third welding sections 702 facing the same direction are respectively connected to the two U-shaped open ends of the third U-shaped conductor 701. This structure of the reverse twist hairpin 7 can change the winding direction of the branch coil, for example, twisting it from a clockwise direction to a counterclockwise direction.

[0088] Combination Figures 7 to 10 It can be seen that in the branch coil, a lead-out hairpin 5 and a U-shaped hairpin 6 can be connected by lap welding the first welding section 502 and the second welding section 602; two U-shaped hairpins 6 can be connected by lap welding the second welding section 602 of the first U-shaped hairpin 6 and the second welding section 602 of the second U-shaped hairpin 6; and the U-shaped hairpin 6 and the reverse twist hairpin 7 can be connected by lap welding the second welding section 602 and the third welding section 702.

[0089] The following is combined Figures 7-10 The structural description of the layout of individual branch coils in the stator core 1 with 54 stator slots is as follows:

[0090] Issue card 5 ( Figure 10 Position A is the starting point of the first coil branch, moving clockwise from layer 5 to layer 4) → U-shaped hairpin 6 (moving clockwise from layer 3 to layer 2) → Reverse twist hairpin 7 (the end point of the first coil branch, located on layer 1, turning clockwise to counterclockwise) → U-shaped hairpin 6 (the starting point of the second coil branch, moving counterclockwise from layer 2 to layer 3) → U-shaped hairpin 6 (moving counterclockwise from layer 4 to layer 5) → Reverse twist hairpin 7 (the end point of the second coil branch) Located on the 6th layer, it will be twisted from counterclockwise to clockwise) → U-shaped hairpin 6 (the starting point of the second coil branch, which crosses from the 5th layer to the 4th layer in a clockwise direction) → U-shaped hairpin 6 (crossing from the 3rd layer to the 2nd layer in a clockwise direction) → Reverse twist hairpin 7 (the ending point of the second coil branch, located on the 1st layer, which will be twisted from clockwise to counterclockwise) → Set the second coil branch in a counterclockwise direction → Set the second coil branch in a clockwise direction → Set the second coil branch in a counterclockwise direction → Complete.

[0091] It should be noted that the above-mentioned single branch coil has a total of 18 hairpins, of which the third welding section 702 of the last reverse twist hairpin 7 ( Figure 10 The middle B position corresponds to the lead-out segment 503. Additionally, the crown end ( Figure 1 The slot crossing situation of the lower end of the card is as follows: the first layer crosses 9 slots with the same card, the second and third layers cross 10 slots with the same card, the fourth and fifth layers cross 10 slots with the same card, the sixth layer crosses 8 slots with the same card, and the sixth layer crosses 11 slots with the same card; the same card positions are concentrated, and the same lines in the inner layer and the same lines in the outer layer are concentrated and evenly distributed in the circumferential direction.

[0092] like Figure 11 The diagram shows the distribution of three-phase coil 2 within 54 stator slots. As can be seen from the diagram, the number of pole pairs for three-phase coil 2 is 3 (the gray area in the diagram contains 6 slots, hence the 3 pole pairs). The distribution pattern for each phase and each pole in the corresponding stator slot is shown below. Figures 12-14 .

[0093] like Figure 12 As shown, for a single pole, all three-phase coils 2 accommodated in the 24th stator slot are used to transmit the first phase of the three-phase alternating current.

[0094] like Figure 13 As shown, stator slots 23 and 25 are located on both sides of stator slot 24. The three-phase coils 2 in the gray area of ​​stator slots 23 and 25 are used to transmit the first phase AC power, and the three-phase coils 2 in the remaining area are used to transmit the other two phase AC power. The number of coils transmitting the first phase AC power is 2 more than the number transmitting the other two phase AC power.

[0095] like Figure 14 As shown, stator slots 22 and 26 are located on the outermost side. The three-phase coils 2 in the gray area of ​​stator slots 22 and 26 are used to transmit the first phase of AC power, while the three-phase coils 2 in the remaining areas are used to transmit the other two phases of AC power. The number of coils transmitting the first phase of AC power is 2 less than the number transmitting the other two phases of AC power.

[0096] The above solution employs a double-layered, staggered configuration within the slots, with only one flat wire surface contact between two phases, reducing the insulation contact area between phases and improving insulation performance. For the 54-slot short-pitch motor, the previous occupancy of 4 slots was changed to 5 slots, effectively reducing the harmonic winding coefficient and thus improving motor performance.

[0097] like Figure 15 The diagram shown is an unfolded diagram of a single-phase (U-phase, V-phase, or W-phase) coil, where numbers 1-54 represent 54 stator slots. Additionally, three parallel branches are provided at the three-phase leads and the neutral terminal.

[0098] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A winding structure based on flat wire conductors, characterized in that, The stator core (1) and the three-phase coil (2) are included. A plurality of stator slots are formed in the inner surface of the stator core (1). The three-phase coil (2) is installed in the stator slots, and the three-phase coil (2) is divided into n layers along the slot bottom to the slot opening of the stator slot, n>1. The three-phase lead-out end of the three-phase coil (2) is located in the ith layer, n≥i≥1. The neutral end of the three-phase coil (2) is located in the jth layer, n≥j≥1 and j≠i. The three-phase lead-out end is connected with a lead-out assembly (3), and the neutral end is connected with a neutral row (4).

2. A winding structure based on flat conductor according to claim 1, characterized in that, The three-phase coil (2) includes U-phase coil, V-phase coil and W-phase coil which are symmetrically distributed at 120°. The U-phase coil, the V-phase coil and the W-phase coil are each provided with a plurality of parallel branch coils. The starting point of each branch coil is connected with the lead-out assembly (3) as the three-phase lead-out end, and the ending point is connected with the neutral row (4) as the neutral end.

3. A winding structure based on flat conductor according to claim 2, characterized in that, The branch coil includes a lead-out hairpin (5), a U-shaped hairpin (6) and a reverse twist hairpin (7). In the current flow direction, the lead-out hairpin (5) as the starting point of the branch coil is sequentially connected with the U-shaped hairpin (6) and the reverse twist hairpin (7) in series across layers until the first layer or the nth layer to form a first branch coil. In the first branch coil, if the lead-out hairpin (5) is located in the second layer, the reverse twist hairpin (7) is located in the nth layer, and if the lead-out hairpin (5) is located in the (n-1)th layer, the reverse twist hairpin (7) is located in the first layer. In the current direction, the first U-shaped hairpin (6) is sequentially connected with the next U-shaped hairpin (6) and the next reverse twist hairpin (7) in series across layers until the first layer or the nth layer to form a second branch coil. In the second branch coil, if the first U-shaped hairpin (6) is located in the second layer, the reverse twist hairpin (7) is located in the nth layer, and if the first U-shaped hairpin (6) is located in the (n-1)th layer, the reverse twist hairpin (7) is located in the first layer. In the branch coil, the first branch coil is sequentially connected with a plurality of second branch coils until the last reverse twist hairpin (7) is located in the adjacent layer of the lead-out hairpin (5).

4. A winding structure based on flat conductor according to claim 3, characterized in that, The lead-out hairpin (5) includes a first U-shaped conductor (501), a first welding section (502) and a lead-out section (503). The first U-shaped conductor (501) is in a U shape. The first welding section (502) is connected with one end of the first U-shaped conductor (501). The lead-out section (503) is connected with the other end of the first U-shaped conductor (501), and the lead-out section (503) is used to be connected with the lead-out assembly (3). The first welding section (502) and the lead-out section (503) are oppositely arranged at the U-shaped opening of the first U-shaped conductor (501).

5. A winding structure based on flat conductor according to claim 4, characterized in that, The U-shaped hairpin (6) includes a second U-shaped conductor (601) and symmetrically and oppositely directed second welding sections (602). The second U-shaped conductor (601) is in a U shape. The symmetrically and oppositely directed second welding sections (602) are respectively connected with the two U-shaped openings of the second U-shaped conductor (601).

6. A flat conductor based winding structure according to claim 5, characterized in that The reverse twist hairpin (7) includes a third U-shaped conductor (701) and a third welding section (702) which are directed in the same direction. The third U-shaped conductor (701) is in U shape; The same third welding sections (702) are connected with two U-shaped openings of the third U-shaped conductor (701) respectively.

7. A flat conductor based winding structure according to claim 4, characterized in that In the branch coil: The first welding section (502) and the second welding section (602) are connected between the outgoing hairpin (5) and the U-shaped hairpin (6); The first U-shaped hairpin (6) and the second U-shaped hairpin (6) are connected by the second welding section (602) of the first U-shaped hairpin (6) and the second welding section (602) of the second U-shaped hairpin (6); The U-shaped hairpin (6) and the anti-twist hairpin (7) are connected by the second welding section (602) and the third welding section (702).

8. A flat conductor-based winding structure according to claim 1, characterized in that The outgoing assembly (3) comprises: The connecting shell (307) is in arc shape; The first outgoing line (301) is connected with the first outgoing row (302); The first outgoing row (302) is provided with a plurality of welding legs connected with three-phase outgoing ends; The second outgoing line (303) is connected with the second outgoing row (304); The second outgoing row (304) is provided with a plurality of welding legs connected with three-phase outgoing ends; The third outgoing line (305) is connected with the third outgoing row (306); The third outgoing row (306) is provided with a plurality of welding legs connected with three-phase outgoing ends; The first outgoing row (302), the second outgoing row (304) and the third outgoing row (306) are insulated from each other and are installed in the connecting shell (307).

9. A flat conductor based winding structure according to claim 8, characterized in that The arc surface of the connecting shell (307) is further provided with a plurality of locking blocks (3071); The surface of the locking block (3071) facing the connecting shell (307) is in abutment with the surface of the neutral row (4) away from the connecting shell (307), for limiting the movement of the neutral row (4) along the radial direction of the stator core (1).

10. A flat conductor based winding structure according to claim 9, characterized in that The neutral row (4) is in arc shape, and a plurality of welding legs connected with neutral ends are arranged on the neutral row (4).

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