Winding structure of flat wire motor

Abstract

The utility model belongs to the technical field of flat wire motors, and provides a winding structure of a flat wire motor, which comprises a stator core, three-phase coils, a three-phase bar and a neutral bar, a plurality of stator slots are arranged on the inner surface of the stator core, the three-phase coils are mounted in the stator slots at spans of Y-2, Y, Y + 1 and Y + 2, and Y is greater than or equal to 9; in addition, a plurality of layers of three-phase coils are arranged from the groove opening to the groove bottom of the stator groove. The three-phase bar is connected with the current inflow end of the three-phase coil, the neutral bar is connected with the current outflow end of the three-phase coil, and the three-phase bar and the neutral bar are stacked and insulated from each other. According to the utility model, the three-phase coils are arranged in a plurality of layers and are matched with specific spans, so that imbalance among branches and circulation among the branches are avoided, harmonic waves are reduced, fluctuation of winding resistance and inductance is reduced, the efficiency of the motor is improved, and energy consumption can be reduced under the same working condition.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the flat wire motor technical field, especially relate to a winding structure of flat wire motor. BACKGROUND

[0002] Flat wire motor is the first choice of new energy automobile drive system, can provide more superior acceleration performance, improve the power of vehicle, reduce energy consumption simultaneously, increase the endurance mileage. However, the existing flat wire motor has the following shortcomings:

[0003] 1. The existing flat wire stator of multi-branch whole pitch or single-layer short pitch winding mode, will appear unbalance between winding branches and inter-branch circulating current when the motor is running, so that the magnetic field contains a large number of harmonics, resulting in the reduction of motor product quality.

[0004] 2. The stator end structure of the existing hairpin type flat wire motor is composed of three-phase wire part, neutral point connection part, welding end and hairpin end to form a current loop, the three-phase wire part and the neutral point connection part are widely distributed, and in the design of the whole motor, a large space is required to design the envelope.

[0005] 3. The existing profiled wire scheme has many hairpin types, which reduces the production efficiency. INVENTION CONTENTS

[0006] In view of the problems in the background art, the utility model provides a winding structure of flat wire motor.

[0007] In order to realize the above purpose, the utility model adopts the following technical scheme:

[0008] A winding structure of flat wire motor, comprising a stator core, three-phase coils, three-phase rows and a neutral row.

[0009] The inner surface of the stator core is provided with a plurality of stator slots;

[0010] The three-phase coils are installed in the stator slots with span Y-2, Y, Y+1 and Y+2, Y≥9;

[0011] From the slot opening to the slot bottom, a plurality of layers of three-phase coils are arranged;

[0012] The three-phase row is connected with the current inflow end of the three-phase coil;

[0013] The neutral row is connected with the current outflow end of the three-phase coil;

[0014] The three-phase row and the neutral row are stacked and insulated from each other.

[0015] Preferably, the stator core inner surface is provided with 54 stator slots, the span Y=9, and 6 layers of the three-phase coil are arranged from the slot opening to the slot bottom of the stator slot.

[0016] Preferably, the three-phase coil comprises three single-phase coils, each of the single-phase coils comprising two branches in parallel;

[0017] The two branches comprise a plurality of U-shaped hairpins connected in series, and the span of the U-shaped hairpin is 7, 9, 10 or 11;

[0018] In the two parallel branches, the U-shaped hairpin of the first branch starts from the slot bottom of the nth stator slot and is arranged in a first direction to the slot opening of the n+9th stator slot, which represents the stator slot corresponding to the ninth span in the first direction from the nth stator slot;

[0019] The U-shaped hairpin of the second branch starts from the slot opening of the nth stator slot and is arranged in a second direction to the slot bottom of the n-9th stator slot, which represents the stator slot corresponding to the ninth span in the second direction from the nth stator slot;

[0020] The first direction and the second direction are opposite, and the first direction is clockwise or counterclockwise.

[0021] Preferably, the U-shaped hairpin comprises a first hairpin and a second hairpin;

[0022] In the single-phase coil, the first hairpin and a plurality of second hairpins are connected in series to obtain a series topology, and the series topology is any one of the branches.

[0023] Preferably, the first hairpin comprises a first U-shaped segment, a first bending segment, a first welding segment and a lead-in segment which are integrally formed;

[0024] The first U-shaped segment is in a U shape, and the U-shaped opening is connected to the first bending segment;

[0025] The first bending segment is provided with two, which are mutually opposite and symmetrical at the U-shaped opening;

[0026] The first welding segment is provided with one, which is connected to one of the first bending segments;

[0027] The lead-in segment is provided with one, which is connected to the other first bending segment.

[0028] Preferably, the second hairpin comprises a second U-shaped segment, a second bending segment and a second welding segment which are integrally formed;

[0029] The second U-shaped segment is in a U shape, and the U-shaped opening is connected to the second bending segment;

[0030] The second bending sections are provided with two, which are mutually opposite and symmetrical at the U-shaped opening.

[0031] The second welding sections are provided with two, which are connected with the corresponding second bending sections respectively.

[0032] Preferably, in any branch, the introduction section of the first hairpin is used as the current inflow end.

[0033] The second welding section of the last second hairpin is used as the current outflow end.

[0034] Preferably, the stator slot is inserted with insulating paper for wrapping the U-shaped hairpin.

[0035] Preferably, the U-shaped hairpin adopts a flat copper conductor.

[0036] Preferably, the three-phase row includes a U-phase copper row, a V-phase copper row and a W-phase copper row which are stacked and insulated from each other.

[0037] The U-phase copper row, the V-phase copper row and the W-phase copper row are provided with a plurality of welding legs connected with the current inflow end.

[0038] The neutral row is insulated and arranged below the three-phase row, and is provided with a plurality of welding legs connected with the current outflow end.

[0039] The utility model discloses the beneficial effect:

[0040] 1, the utility model discloses in space utilization, because three -phase coil is closely arranged, and the winding fill factor is greatly improved than traditional round wire winding, effectively promotes motor power density, makes motor can output greater power under the same volume, in electrical performance aspect, the setting of three -phase coil several layers and cooperation specific span setting, avoid appearing between branch unbalance and the situation of circulation between branch, reduce harmonic, reduce the fluctuation of winding resistance and inductance, improve motor efficiency, can reduce energy consumption under the same working condition;

[0041] 2, the utility model patent adopts the winding mode of multibranch double -deck short distance and distributes evenly in the parallel branch of each phase, avoids circulation, can significantly reduce harmonic content simultaneously, effectively reduces the noise of 54 -slot motor of motor, is favorable to motor noise, vibration and sound vibration roughness (NVH, Noise, Vibration, Harshness) performance;

[0042] 3, the utility model adopts U-shaped hairpin and winds, makes three -phase point (current inflow end) and neutral point (current outflow end) connection concentration, and need not change three -phase incoming line order, can effectively reduce the back end cover envelope size, reduces the weight of electric drive system;

[0043] 4. The utility model discloses only adopt U-shaped hairpin, and the short circuit of branch is realized through the U-shaped hairpin of different span, and three-phase interval position is equal, therefore three-phase row shape can be same, effectively solve the problem of more hairpin types.

[0044] Other features and advantages of the present utility model will be set forth in the following description of the utility model, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present utility model. The objects and other advantages of the present utility model can be realized and obtained by the structure pointed out in the description and drawings. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to more clearly illustrate the technical scheme in the embodiments of the present utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, and obviously, the drawings in the following description are some embodiments of the present utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without paying creative labor.

[0046] Figure 1 The utility model discloses a flat wire motor's winding structure's schematic diagram is shown;

[0047] Figure 2 The utility model discloses the structure schematic drawing of first hairpin is shown;

[0048] Figure 3 The utility model discloses the structure schematic drawing of second hairpin is shown;

[0049] Figure 4 The utility model discloses the installation schematic drawing of U phase copper row and neutral row is shown;

[0050] Figure 5 The utility model discloses the installation schematic drawing of V phase copper row and neutral row is shown;

[0051] Figure 6 The utility model discloses the installation schematic drawing of W phase copper row and neutral row is shown;

[0052] Figure 7 The utility model discloses the installation schematic drawing of three-phase row and neutral row is shown;

[0053] Figure 8 The utility model discloses the structure schematic drawing of U phase coil is shown;

[0054] Figure 9 The utility model discloses the structure schematic drawing of single complete branch is shown;

[0055] Figure 10 The utility model discloses the development drawing of U phase coil is shown;

[0056] Figure 11 The unfolded view of the three-phase coil of the utility model is shown.

[0057] In the figure: 1, stator core; 2, three-phase coil; 3, three-phase row; 301, U-phase copper row; 302, V-phase copper row; 303, W-phase copper row; 4, neutral row; 5, first hairpin; 501, first U-shaped section; 502, first bending section; 503, first welding section; 504, lead-in section; 6, second hairpin; 601, second U-shaped section; 602, second bending section; 603, second welding section. DETAILED DESCRIPTION

[0058] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely explained below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0059] A winding structure of a flat wire motor comprises a stator core 1, a three-phase coil 2, a three-phase row 3 and a neutral row 4. The stator core 1 is in a cylindrical shape, and a plurality of stator slots are uniformly arranged on the inner surface of the stator core 1. The three-phase coil 2 is composed of a plurality of U-shaped hairpins, which can be installed in the stator slots through spans Y-2, Y, Y+1 and Y+2, and Y is greater than or equal to 9. The three-phase coil 2 is provided with a plurality of layers from the slot opening to the slot bottom. The three-phase row 3 is connected with the current inflow end of the three-phase coil 2, and the neutral row 4 is connected with the current outflow end of the three-phase coil 2, and the neutral row 4 is generally located below the three-phase row 3.

[0060] It should be noted that, in terms of space utilization, due to the close arrangement of the U-shaped hairpins, the winding fill rate is greatly improved compared with the traditional round wire winding, effectively improving the motor power density, so that the motor can output more power under the same volume. In terms of electrical performance, the multi-layer winding cooperates with the specific span setting to reduce the fluctuation of winding resistance and inductance, reduce copper loss, improve motor efficiency, and reduce energy consumption under the same working condition. In addition, the reasonable layout of the three-phase row 3 and the neutral row 4 optimizes the current path, reduces the line impedance, reduces the heat generation, improves the system stability and reliability, and enables the flat wire motor to better perform in the fields of new energy vehicles and industrial drives.

[0061] As an option, the stator core 1 is made of a certain number of silicon steel sheets by riveting, welding or bonding, etc. It contains the stator yoke, the stator tooth and the stator tooth head. The stator tooth head is the outer part of the stator core 1. The stator tooth is the part of the stator core 1 that directly contacts the three-phase coil 2, used to fix the three-phase coil 2. The stator tooth head is located at the top of the stator tooth and is mainly used to improve the magnetic field distribution of the stator core 1, reduce magnetic field distortion and leakage flux, and improve the efficiency and power factor of the motor. The stator slot of the stator core 1 is a rectangular slot with consistent size. In order to ensure insulation performance, a certain thickness of insulation paper is inserted into the rectangular slot, which can wrap the U-shaped hairpin. The U-shaped hairpin uses flat copper conductor, which is inserted into the rectangular slot. Each slot can insert 2m (m is a natural number) conductors. In order to achieve electrical connection between U-shaped hairpins in the rectangular slot, welding process is usually used.

[0062] As shown in Figure 1 In this embodiment, 54 stator slots are provided on the inner surface of the stator core 1, the span Y = 9, and the number of layers of the three-phase coil 2 is 6. Among them, the three-phase coil 2 includes three single-phase coils (U, V and W phases), and each single-phase coil includes two parallel branches. Each branch is formed by a plurality of U-shaped hairpins connected in series. The U-shaped hairpin can have various spans. Each branch is distributed according to the above span rule in the circumferential direction to achieve short-distance distribution of flat wire conductors of the entire stator, and short-circuiting without circulating current.

[0063] In addition, since 2m conductors can be inserted into each slot, there are 2m layers of conductors in each slot, so Figure 1 6 conductors can be inserted into each slot. When layered, the slot bottom of the stator slot can be set as the outermost layer (first layer), and the slot opening close to the stator slot can be set as the innermost layer (sixth layer). The conductors (U-shaped hairpins) in the slot corresponding to each branch are installed in the stator slots according to the adjacent layer cycle until a cycle ends and switches to the next adjacent layer for cycle installation and arrangement. Finally, the current introduction end and the current extraction end of the flat wire winding structure are concentratedly arranged in the outermost layer and the innermost layer of the stator slot, which is convenient for subsequent wiring.

[0064] Further, in the two parallel branches, the U-shaped hairpin of the first branch takes the slot bottom of the nth stator slot as the starting point and is wound to the slot opening of the n+9th stator slot in the first direction, and the n+9th stator slot represents the stator slot corresponding to the nth stator slot plus nine spans in the first direction. The U-shaped hairpin of the second branch takes the slot opening of the nth stator slot as the starting point and is wound to the slot bottom of the n-9th stator slot in the second direction, and the n-9th stator slot represents the stator slot corresponding to the nth stator slot plus nine spans in the second direction. The first direction and the second direction are opposite, and the first direction is clockwise or counterclockwise.

[0065] It should be noted that in the embodiment, the two parallel branches of the single-phase coil are wound in opposite directions, so the two current introduction ends are distributed at the slot bottom and slot opening of the stator slot, and the current introduction and current introduction ends are the same. For the three-phase coil 2, there are six current introduction ends (three at the slot opening and three at the slot bottom) and six current introduction ends (three at the slot opening and three at the slot bottom).

[0066] Further, the U-shaped hairpin includes a first hairpin 5 and a second hairpin 6; in the single-phase coil, the first hairpin 5 and a plurality of second hairpins 6 are connected in series to obtain a series topology structure, and the series topology structure is any one of the branches.

[0067] As shown in Figure 2 , the first hairpin 5 is composed of a first U-shaped segment 501, a first bending segment 502, a first welding segment 503 and an introduction segment 504. Among them, the first U-shaped segment 501 is in the shape of U, and the U-shaped opening part is connected with the first bending segment 502. The first bending segment 502 has two, which are mutually opposite and symmetrically distributed at the U-shaped opening. The first welding segment 503 has only one, which is connected with one of the first bending segments 502; the introduction segment 504 also has only one, which is connected with the other first bending segment 502.

[0068] As shown in Figure 3 , the second hairpin 6 is composed of a second U-shaped segment 601, a second bending segment 602 and a second welding segment 603. Among them, the second U-shaped segment 601 is in the shape of U, and the U-shaped opening part is connected with the second bending segment 602. The second bending segment 602 has two, which are mutually opposite and symmetrically distributed at the U-shaped opening. The second welding segment 603 also has two, each of which is connected with the corresponding second bending segment 602.

[0069] It should be noted that when defining the span, the interval of six stator slots between the two straight conductors of the U-shaped segment (the first U-shaped segment 501 and the second U-shaped segment 601) is defined as spanning seven hairpins, the interval of eight stator slots is defined as spanning nine hairpins, and so on. In addition, in the three-phase coil 2, the first U-shaped segment 501 and the second U-shaped segment 601 include the straight segment conductor inserted into the stator slot, the straight segment conductor with a closed end is connected by the U-shaped structure, thereby forming a closed end (hairpin end), and the straight segment conductor at the other end can be formed into a welding end by means of a twisted head expansion welding.

[0070] It should be further noted that in any branch, the introduction segment 504 of the first hairpin 5 serves as the current inflow end, and the second welding segment 603 of the last second hairpin 6 serves as the current outflow end, then the introduction segment 504 of the first hairpin 5 can be welded with the three-phase row 3, and one of the second welding segments 603 of the last second hairpin 6 can be connected with the neutral row 4.

[0071] Furthermore, the three-phase busbar 3 includes stacked and mutually insulated U-phase copper busbar 301, V-phase copper busbar 302, and W-phase copper busbar 303. Each copper busbar of the three-phase busbar 3 is provided with a corresponding solder joint, which can be soldered to the corresponding U-shaped hairpin in the three-phase coil 2.

[0072] As an optional solution, the following is combined with Figures 4-7 Further explanation of the configuration of three-phase busbar 3:

[0073] like Figure 4 As shown, the U-phase copper busbar 301 has two solder pads, each corresponding to a branch, thus forming two parallel branches. These two parallel branches correspond to a single-phase coil, resulting in the U-phase coil. Figure 4 The U-phase copper busbar 301 is welded to the introduction section 504 of the first hairpin 5 on both sides via welding feet. Additionally... Figure 4 The neutral pin 4 corresponds to six solder feet, two of which are connected to the second solder section 603 of the U-phase coil.

[0074] like Figure 5 As shown, the V-phase copper busbar 302 has two solder pads, each corresponding to a branch, thus forming two parallel branches. These two parallel branches correspond to a single-phase coil, resulting in the V-phase coil. Figure 5 The V-phase copper busbar 302 is welded to the introduction section 504 of the first hairpin 5 on both sides via welding feet. Additionally... Figure 5 The neutral pin 4 corresponds to six solder feet, two of which are connected to the second solder section 603 of the V-phase coil.

[0075] like Figure 6 As shown, the W-phase copper busbar 303 has two solder pads, each corresponding to a branch, thus forming two parallel branches. These two parallel branches correspond to one single-phase coil, resulting in the W-phase coil. Figure 6 The middle W-phase copper busbar 303 is welded to the introduction section 504 of the first hairpin 5 on both sides via welding feet. Additionally... Figure 6 The neutral pin 4 corresponds to six solder feet, two of which are connected to the second solder section 603 of the W phase coil.

[0076] like Figure 7 The diagram shows the completed installation of the three-phase busbar 3 (using copper busbars) and the neutral busbar 4 (using copper busbars). From top to bottom, the copper busbars are U-phase 301, V-phase 302, W-phase 303, and neutral busbar 4. As can be seen from the diagram, the three-phase busbar 3, neutral busbar 4, current inlet terminals, and current outlet terminals are all installed in a certain pattern and concentrated at the end of the three-phase coil 2. This arrangement allows the three-phase busbar 3 and neutral busbar 4 to be connected in a concentrated manner, without needing to change the three-phase incoming line sequence.

[0077] As an alternative, the following describes the specific winding structure of a 6-layer 54-slot (span 7 / 9 / 10 and 11) single-phase coil, in which the stator slot bottom is the first layer and the slot opening is the sixth layer:

[0078] First branch: the current introduction end uses the first hairpin 5 (span 11, distributed in layers 1 and 2) → the second hairpin 6 (span 7, distributed in layers 1 and 2) → the second hairpin 6 (span 11, distributed in layers 1 and 2) → the second hairpin 6 (span 7, distributed in layers 1 and 2) → the second hairpin 6 (span 10, distributed in layers 1 and 2) → the second hairpin 6 (span 9, distributed in layers 1 and 2) → the second hairpin 6 (span 9, distributed in layers 1 and 2) → the second hairpin 6 (span 10, distributed in layers 1 and 2) → the second hairpin 6 (span 7, bridging from layers 1 and 2 to layer 3) → the second hairpin 6 (span 9, distributed in layers 3 and 4) → the second hairpin 6 (span 10, distributed in layers 3 and 4) → the second hairpin 6 (span 7, distributed in layers 3 and 4) → the second hairpin 6 (span 11, distributed in layers 3 and 4) → the second hairpin 6 (span 7, distributed in layers 3 and 4) → the second hairpin 6 (span 11, distributed in layers 3 and 4) → the second hairpin 6 (span 7, distributed in layers 3 and 4) → the second hairpin 6 (span 9, bridging from layers 3 and 4 to layer 5) → the second hairpin 6 (span 7, distributed in layers 5 and 6) → the second hairpin 6 (span 10, distributed in layers 5 and 6) → the second hairpin 6 (span 9, distributed in layers 5 and 6) → the second hairpin 6 (span 9, distributed in layers 5 and 6) → the second hairpin 6 (span 10, distributed in layers 5 and 6) → the second hairpin 6 (span 7, distributed in layers 5 and 6) → the second hairpin 6 (span 11, distributed in layers 5 and 6) → the second hairpin 6 (span 7, distributed in layers 5 and 6) → the second hairpin 6 (span 11, distributed in layers 5 and 6), and the last second hairpin 6 has a second welding section 603 connected to the neutral bar 4 in layer 6 as the current introduction end.

[0079] The second branch has the opposite winding direction to the first branch: The current inlet uses the following sequence: First hairpin 5 (span 11, distributed on layers 6 and 5) → Second hairpin 6 (span 7, distributed on layers 6 and 5) → Second hairpin 6 (span 10, distributed on layers 6 and 5) → Second hairpin 6 (span 7, distributed on layers 6 and 5) → Second hairpin 6 (span 10, distributed on layers 6 and 5) → Second hairpin 6 (span 9, distributed on layers 6 and 5) → Second hairpin 6 (span 1 ... (Span 9, distributed on the 6th and 5th floors) → Second hairpin 6 (span 10, distributed on the 6th and 5th floors) → Second hairpin 6 (span 7, from the 6th and 5th floors to the 4th floor) → Second hairpin 6 (span 9, distributed on the 4th and 3rd floors) → Second hairpin 6 (span 10, distributed on the 4th and 3rd floors) → Second hairpin 6 (span 7, distributed on the 4th and 3rd floors) → Second hairpin 6 (span 11, distributed on the 4th and 3rd floors) → Second hairpin 6 (span 7, distributed on the 4th and 3rd floors) Layer 6) → Second hairpin 6 (span 11, distributed on layers 4 and 3) → Second hairpin 6 (span 7, distributed on layers 4 and 3) → Second hairpin 6 (span 10, distributed on layers 4 and 3) → Second hairpin 6 (span 9, from layers 4 and 3 to layer 2) → Second hairpin 6 (span 7, distributed on layers 2 and 1) → Second hairpin 6 (span 10, distributed on layers 2 and 1) → Second hairpin 6 (span 9, distributed on layers 2 and 1) → Second hairpin 6 (span 9, from layers 4 and 3 to layer 2) The second hairpin 6 (span 9, distributed in layers 2 and 1) → second hairpin 6 (span 10, distributed in layers 2 and 1) → second hairpin 6 (span 7, distributed in layers 2 and 1) → second hairpin 6 (span 11, distributed in layers 2 and 1) → second hairpin 6 (span 7, distributed in layers 2 and 1) → second hairpin 6 (span 11, distributed in layers 2 and 1), and the second welding segment 603 of the last second hairpin 6 is connected to the neutral busbar 4 in layer 1 as a current lead-out terminal.

[0080] like Figure 8 The diagram shows the winding of the U-phase coil. The winding is installed using the aforementioned structure, forming two parallel branches.

[0081] like Figure 9 As shown, this is the winding structure of a single branch, where the current inlet and current outlet are both located in the same stator slot.

[0082] like Figure 10 The diagram shown is an unfolded diagram of the U-phase coil, where U represents the current inflow end, U' represents the current outflow end, and the numbers 1-54 represent the 54 stator slots.

[0083] like Figure 11As shown, it is an unfolded view of the three-phase coil 2, wherein U, V, W respectively represent current inflow ends of the U-phase coil, the V-phase coil and the W-phase coil, U', V', W' respectively represent current outflow ends of the U-phase coil, the V-phase coil and the W-phase coil, and numbers 1-54 represent 54 stator slots.

[0084] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it still can modify the technical scheme recorded in foregoing each embodiment, or equivalent replacement is carried out to part technical features to foregoing each embodiment; and these modifications or replacements, do not make the essence of corresponding technical scheme deviate from the spirit and scope of the technical scheme of each embodiment of the utility model.

Claims

1. A winding structure of a flat wire motor, characterized by, The stator core (1), three-phase coils (2), three-phase rows (3) and neutral rows (4) are included. The inner surface of the stator core (1) is provided with a plurality of stator slots. The three-phase coils (2) are installed in the stator slots with a span Y-2, Y, Y+1 and Y+2, Y≥9. From the slot opening to the slot bottom of the stator slot, a plurality of layers of the three-phase coils are provided. The three-phase rows (3) are connected with the current inflow end of the three-phase coils (2). The neutral rows (4) are connected with the current outflow end of the three-phase coils (2). The three-phase rows (3) and the neutral rows (4) are stacked and insulated from each other.

2. A winding structure for a flat wire motor according to claim 1, characterized in that, The inner surface of the stator core (1) is provided with 54 stator slots, the span Y=9, and from the slot opening to the slot bottom of the stator slot, 6 layers of the three-phase coils (2) are provided.

3. A winding structure for a flat wire motor according to claim 2, characterized in that The three-phase coils (2) include three single-phase coils, each of which includes two branches in parallel. The two branches include a plurality of U-shaped hairpins connected in series. In the two parallel branches, the U-shaped hairpin of the first branch starts from the slot bottom of the nth stator slot and is wound to the slot opening of the n+9th stator slot in the first direction, wherein the n+9th stator slot represents the stator slot corresponding to the addition of nine spans to the nth stator slot in the first direction. The U-shaped hairpin of the second branch starts from the slot opening of the nth stator slot and is wound to the slot bottom of the n-9th stator slot in the second direction, wherein the n-9th stator slot represents the stator slot corresponding to the addition of nine spans to the nth stator slot in the second direction. The first direction and the second direction are opposite, and the first direction is clockwise or counterclockwise.

4. A winding structure for a flat wire motor according to claim 3, wherein The U-shaped hairpin includes a first hairpin (5) and a second hairpin (6). In the single-phase coil, the first hairpin (5) and a plurality of second hairpins (6) are connected in series to obtain a series topology structure, and the series topology structure is any one of the branches.

5. A winding structure for a flat wire motor according to claim 4, characterized in that The first hairpin (5) includes a first U-shaped segment (501), a first bending segment (502), a first welding segment (503) and a lead-in segment (504). The first U-shaped segment (501) is U-shaped, and the U-shaped opening is connected with the first bending segment (502). The first bending segment (502) is provided with two, which are opposite and symmetrical at the U-shaped opening. The first welding segment (503) is provided with one, which is connected with one first bending segment (502). The lead-in segment (504) is provided with one, which is connected with the other first bending segment (502).

6. A winding structure for a flat wire motor according to claim 5, characterized in that, The second hairpin (6) includes a second U-shaped segment (601), a second bending segment (602) and a second welding segment (603). The second U-shaped segment (601) is U-shaped, and the U-shaped opening is connected with the second bending segment (602). The second bending segment (602) is provided with two, which are opposite and symmetrical at the U-shaped opening. The second welding segment (603) is provided with two, which are connected with the corresponding second bending segment (602), respectively.

7. A winding structure of a flat wire motor according to claim 4, wherein In any branch, the lead-in segment (504) of the first hairpin (5) serves as the current inflow end. The second welding section (603) of the last second hairpin (6) is used as a current outflow end.

8. A winding structure for a flat wire motor according to any one of claims 3-7, characterized in that, An insulating paper is arranged in the stator slot to wrap the U-shaped hairpin.

9. A winding structure for a flat wire motor according to any one of claims 3-7, characterized in that, The U-shaped hairpin adopts a flat copper conductor.

10. A winding structure for a flat wire motor according to any one of claims 3-7, characterized in that, The three-phase row (3) comprises a U-phase copper row (301), a V-phase copper row (302) and a W-phase copper row (303) which are sequentially stacked and insulated from each other. The U-phase copper row (301), the V-phase copper row (302) and the W-phase copper row (303) are each provided with a plurality of welding legs connected with the current inflow end. The neutral row (4) is arranged below the three-phase row (3) and is provided with a plurality of welding legs connected with the current outflow end.

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