A winding structure for a flat wire motor stator

Abstract

This invention provides a winding structure for a flat wire motor stator, including a stator core, three-phase windings, three-phase copper busbars, and a neutral busbar. The three-phase windings are installed in the stator core. Each phase of the three-phase copper busbar has an inner lead end and an outer lead end. The neutral busbar has an inner neutral end and an outer neutral end. Each unidirectional winding in the three-phase windings includes an outer winding and an inner winding. This invention uses outer and inner windings in the arrangement and installation of the flat wire motor windings to achieve an outer-in, inner-out (or inner-in, outer-out) winding method, which solves the problem of difficulty in connecting the three phases at the winding ends and the neutral point caused by existing inner-in, inner-out, and outer-in, outer-out winding methods. This invention uses inner and outer anti-torsion U-shaped hairpins to achieve the commutation connection of the current in the windings, replacing the bridging of irregular wires, simplifying the structure of the outgoing ends, and increasing the reliability of the connection.

Description

Technical Field

[0001] This invention belongs to the field of flat wire motor technology, and specifically relates to a winding structure of a flat wire motor stator. Background Technology

[0002] Stator windings refer to the windings installed on the stator, that is, the copper wires wound around the stator. A winding is a collective term for multiple coils or groups of coils forming a phase or the entire electromagnetic circuit. Motor windings can be divided into two categories based on the shape of the coil windings and the wiring method: centralized and distributed. Centralized windings are simpler to wind and install, but have lower efficiency and poorer operating performance. Most current AC motor stators use distributed windings. Depending on the model, type, and coil winding process, different motor designs employ different winding types and specifications. Currently, the most common flat wire winding form is the hairpin winding, which requires only one end to be soldered.

[0003] However, during the winding of hairpin windings, the three-phase copper busbar leads and the neutral busbar leads are often not concentrated, which brings inconvenience to installation and maintenance. In addition, many use inner or outer layer lead-out methods, so the copper busbar and hairpin leads are fixed in the inner or outer layer, resulting in poor stability of the copper busbar. Summary of the Invention

[0004] To address the above problems, this invention proposes a winding structure for a flat wire motor stator.

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

[0006] A winding structure for a flat wire motor stator includes a stator core, three-phase windings, three-phase copper busbars, and a neutral busbar;

[0007] The three-phase windings are installed in the stator core;

[0008] Each phase of the three-phase copper busbar is provided with an inner lead end and an outer lead end;

[0009] The neutral bar is provided with an inner neutral end and an outer neutral end;

[0010] Each unidirectional winding in the three-phase winding includes an outer winding and an inner winding;

[0011] One end of the outer winding is connected to the outer lead end, and the other end is connected to the outer neutral end;

[0012] One end of the inner winding is connected to the inner lead end, and the other end is connected to the inner neutral end.

[0013] Preferably, the stator core is annular, and the inner annular surface has a plurality of insulating grooves formed radially.

[0014] Preferably, the three-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding;

[0015] The U-phase winding, V-phase winding, and W-phase winding all include an outer winding and an inner winding;

[0016] Both the outer and inner windings are installed in insulating slots.

[0017] Preferably, both the outer winding and the inner winding include a first hairpin, a second hairpin, and a third hairpin;

[0018] One end of the first hairpin is connected to the inner lead or the outer lead, and the other end is connected to several second hairpins in a clockwise or counterclockwise direction until one end of the second hairpin is connected to the third hairpin.

[0019] The other end of the third hairpin is connected to several second hairpins in a counterclockwise or clockwise direction until the second hairpins are connected to the inner neutral end or the outer neutral end.

[0020] Preferably, the three-phase copper busbar includes a U-phase copper busbar, a V-phase copper busbar, and a W-phase copper busbar, all of which are arc-shaped;

[0021] The inner lead ends are respectively set on the inner arc surfaces of the U-phase copper busbar, V-phase copper busbar and W-phase copper busbar;

[0022] The external lead ends are respectively located on the outer arc surfaces of the U-phase copper busbar, V-phase copper busbar, and W-phase copper busbar.

[0023] Preferably, the inner lead terminal includes a first inner lead terminal, a second inner lead terminal, and a third inner lead terminal;

[0024] The external lead terminal includes a first external lead terminal, a second external lead terminal, and a third external lead terminal;

[0025] The first inner lead end is located on the inner arc surface of the U-phase copper busbar, and the first outer lead end is located on the outer arc surface of the U-phase copper busbar.

[0026] The second inner lead end is located on the inner arc surface of the V-phase copper busbar, and the second outer lead end is located on the outer arc surface of the V-phase copper busbar;

[0027] The third inner lead is located on the inner arc surface of the W-phase copper busbar, and the third outer lead is located on the outer arc surface of the W-phase copper busbar.

[0028] Preferably, one end of the U-phase copper busbar is provided with a first terminal, one end of the V-phase copper busbar is provided with a second terminal, and one end of the W-phase copper busbar is connected to a third terminal.

[0029] Preferably, the first hairpin is U-shaped, and the opening of the U-shape is provided with first welding heads that are opposite to each other.

[0030] Preferably, the second hairpin is U-shaped, and the opening of the U-shape is provided with a second welding head that is opposite to each other.

[0031] Preferably, the third hairpin is U-shaped, and a third welding head facing the same direction is provided at the opening of the U-shape.

[0032] Preferably, the neutral bar is arc-shaped, with the inner neutral end located on the inner arc surface of the neutral bar and the outer neutral end located on the outer arc surface of the neutral bar.

[0033] The beneficial effects of this invention are:

[0034] This invention patent uses outer and inner windings in the arrangement and installation of flat wire motor windings to achieve an outer-in, inner-out (or inner-in, outer-out) winding method. This solves the problem of difficulty in connecting the three phases at the three-phase ends and the neutral point of the winding caused by existing inner-in, inner-out and outer-in, outer-out winding methods. This invention uses inner and outer anti-torsion U-shaped hairpins to achieve the commutation connection of the current in the winding, replacing the bridging of irregular wires, simplifying the structure of the outgoing end, and increasing the reliability of the connection.

[0035] Other features and advantages of the 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 objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 A schematic diagram of the winding structure of a flat wire motor stator according to the present invention is shown;

[0038] Figure 2 A schematic diagram of the W-phase winding structure is shown;

[0039] Figure 3 It shows Figure 2 A magnified view of area A in the middle;

[0040] Figure 4 A schematic diagram of the installation of the first hairpin and the three-phase copper busbar is shown;

[0041] Figure 5 A schematic diagram showing the installation of the second hairpin and the neutral copper busbar is provided.

[0042] Figure 6 A schematic diagram of the installation of the U-phase copper busbar and the first hairpin is shown;

[0043] Figure 7 A schematic diagram of the installation of the V-phase copper busbar and the first hairpin is shown;

[0044] Figure 8 A schematic diagram of the installation of the W-phase copper busbar and the first hairpin is shown;

[0045] Figure 9 A schematic diagram showing the installation of the third hairpin on the outermost layer is shown;

[0046] Figure 10 A schematic diagram showing the installation of the third hairpin in the innermost layer is shown;

[0047] Figure 11 The structural diagram of the first hairpin is shown;

[0048] Figure 12 The structural diagram of the second hairpin is shown;

[0049] Figure 13 The structural diagram of the third hairpin is shown;

[0050] Figure 14 The diagram shows the unfolded shape of the three-phase winding;

[0051] Figure 15 The diagram shows the unfolded shape of a unidirectional winding.

[0052] In the diagram: 1. Stator core; 101. Insulation slot; 2. Hairpin end; 3. Welding end; 4. U-phase copper busbar; 401. First inner lead end; 402. First outer lead end; 403. First terminal; 5. V-phase copper busbar; 501. Second inner lead end; 502. Second outer lead end; 503. Second terminal; 6. W-phase copper busbar; 601. Third inner lead end; 602. Third outer lead end; 603. Third terminal; 7. Neutral busbar; 701. Inner neutral end; 702. Outer neutral end; 8. First hairpin; 801. First welding head; 9. Second hairpin; 901. Second welding head; 10. Third hairpin; 1001. Third welding head. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0054] A winding structure for a flat wire motor stator, such as Figure 1 As shown, it includes a stator core 1, three-phase windings, three-phase copper busbars, and a neutral busbar 7. The three-phase windings are installed in the stator core 1. Each phase of the three-phase copper busbar is provided with an inner lead end and an outer lead end. The neutral busbar 7 is provided with an inner neutral end 701 and an outer neutral end 702. Each unidirectional winding in the three-phase windings includes an outer winding and an inner winding. One end of the outer winding is connected to the outer lead end, and the other end is connected to the outer neutral end 702. One end of the inner winding is connected to the inner lead end, and the other end is connected to the inner neutral end 701.

[0055] It should be noted that the stator core 1 is made of a certain number of silicon steel sheets stacked together, which can be done by riveting, welding or bonding. In addition, the stator core 1 generally includes a stator yoke, a stator tooth section and a stator tooth head.

[0056] In addition, the stator core 1 is annular, and several insulating grooves 101 are radially formed on the inner ring surface.

[0057] It should be noted that the insulating groove 101 is a rectangular groove, and the number can be set to 48. Considering insulation, a certain thickness of insulating paper is inserted into the rectangular groove, and flat copper conductors are inserted into the 48 rectangular grooves. Each groove can insert 2n (n is a natural number) conductors. In order to achieve electrical connection between the conductors in the 48 rectangular grooves, it is necessary to use methods such as hairpins or welding.

[0058] Furthermore, the three-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding, and each of the U-phase winding, V-phase winding, and W-phase winding includes an outer winding and an inner winding installed in the insulating slot 101.

[0059] It should be noted that the outer winding and the inner winding have the same structure, the difference lies in the starting point and the winding direction. For example, the outer winding generally starts from the outside of the three-phase copper busbar and is wound clockwise, while the inner winding generally starts from the inside of the three-phase copper busbar and is wound counterclockwise.

[0060] Furthermore, both the outer and inner windings include a first hairpin 8, a second hairpin 9, and a third hairpin 10; one end of the first hairpin 8 is connected to the inner lead end or the outer lead end, and the other end is connected to several second hairpins 9 in a clockwise or counterclockwise direction until the second hairpin 9 is connected to one end of the third hairpin 10; the other end of the third hairpin 10 is connected to several second hairpins 9 in a counterclockwise or clockwise direction until the second hairpin 9 is connected to the inner neutral end 701 or the outer neutral end 702.

[0061] It should be noted that the first hairpin 8, the second hairpin 9, and the third hairpin 10 are all flat copper conductors, inserted into the insulating slot 101. These flat copper conductors connect to the three-phase copper busbars, forming the outer and inner windings, and have various spans, such as equal spans of 6, 5-span and 7-span cycles, etc., distributed according to the aforementioned span pattern along the circumference of one stator core 1. Assuming that 2n flat copper conductors can be inserted into each slot, each slot has 2n layers of conductors, with the layer closest to the bottom of the slot being the outer layer and the layer closest to the opening being the inner layer. The flat copper conductors corresponding to the outer and inner windings are installed in the insulating slot 101 according to the aforementioned span pattern, in a cyclical manner, until one circumference is completed, switching to the next pair of adjacent layers for cyclical installation.

[0062] In addition, such as Figure 9 As shown, the input and output lines of the three-phase windings are arranged in the outermost and innermost layers of the insulating slot 101. Furthermore, in the commutation connection between the outer and inner windings, several third hairpins 10 are used for electrical bridging in reverse, and these reverse-switched third hairpins 10 coils are located in the innermost and outermost layers of the rectangular slot; wherein... Figure 9 The third hairpin 10 is installed in the innermost layer of the insulating groove 101, corresponding to the outer lead end. Figure 10 The third hairpin 10 is installed on the outermost layer of the insulating groove 101, corresponding to the inner lead end.

[0063] like Figure 4 As shown, the three-phase copper busbar includes a U-phase copper busbar 4, a V-phase copper busbar 5, and a W-phase copper busbar 6, all of which are arc-shaped. The inner lead ends are respectively located on the inner arc surfaces of the U-phase copper busbar 4, V-phase copper busbar 5, and W-phase copper busbar 6. The outer lead ends are respectively located on the outer arc surfaces of the U-phase copper busbar 4, V-phase copper busbar 5, and W-phase copper busbar 6. The first hairpin 8 is then installed starting from the inner lead end and the outer lead end.

[0064] like Figure 5 As shown, the neutral busbar 7 is arc-shaped, with the inner neutral end 701 located on the inner arc surface of the neutral busbar 7 and the outer neutral end 702 located on the outer arc surface of the neutral busbar 7; then, both the inner neutral end 701 and the outer neutral end 702 are connected to a second hairpin 9, which serves as the end point of the three-phase winding.

[0065] It should be noted that the inner lead ends include a first inner lead end 401, a second inner lead end 501, and a third inner lead end 601; while the outer lead ends include a first outer lead end 402, a second outer lead end 502, and a third outer lead end 602; such as Figure 6 As shown, the first inner lead end 401 is located on the inner arc surface of the U-phase copper busbar 4, and the first outer lead end 402 is located on the outer arc surface of the U-phase copper busbar 4. Moreover, one end of the U-phase copper busbar 4 is provided with a first terminal 403, wherein the first inner lead end 401 and the first outer lead end 402 are both connected to a first hairpin 8, which serves as the starting point of the U-phase winding.

[0066] like Figure 7 As shown, the second inner lead end 501 is located on the inner arc surface of the V-phase copper busbar 5, and the second outer lead end 502 is located on the outer arc surface of the V-phase copper busbar 5. Moreover, one end of the V-phase copper busbar 5 is provided with a second terminal 503. The second inner lead end 501 and the second outer lead end 502 are both connected to the first hairpin 8, which serves as the starting point of the V-phase winding.

[0067] like Figure 8 As shown, the third inner lead end 601 is located on the inner arc surface of the W phase copper busbar 6, and the third outer lead end 602 is located on the outer arc surface of the W phase copper busbar 6. Moreover, one end of the W phase copper busbar 6 is connected to the third terminal 603. The third inner lead end 601 and the third outer lead end 602 are both connected to the first hairpin 8, which serves as the starting point of the W phase winding.

[0068] like Figure 11 As shown, the first hairpin 8 is U-shaped, and the opening of the U-shape is provided with first welding heads 801 that are opposite to each other; moreover, the first welding head 801 on one side is longer, so as to facilitate connection with the inner lead end or the outer lead end on the three-phase copper bus.

[0069] like Figure 12 As shown, the second hairpin 9 is U-shaped, and a second welding head 901 that is opposite to each other is provided at the opening of the U-shape; in addition, from Figure 11 As can be seen from the diagram, the second welding head 901 of the second hairpin 9 has the same length, which is suitable for the connection between the second hairpins 9 and the second hairpin 9. In fact, combined with the attached... Figure 5 It can be seen that when the second hairpin 9 is connected to the neutral pin 7, the second welding head 901 at one end is slightly longer.

[0070] like Figure 13 As shown, the third hairpin 10 is U-shaped, and a third welding head 1001 facing the same direction is provided at the opening of the U-shape; the third hairpin 10 is a reverse twist hairpin, and its function is to change the winding direction of the hairpin.

[0071] It should be noted that the openings of the first hairpin 8, the second hairpin 9, and the third hairpin 10 on the stator core 1 face the same direction. The first welding head 801, the second welding head 901, and the third welding head 1001 are connected by welding to form the welding end 3, while the other end of the U-shaped structure forms the hairpin end 2.

[0072] The following is combined Figure 2 and Figure 3 Taking the W-phase winding as an example, the specific layout of the three-phase winding is explained below:

[0073] exist Figure 2In the middle, the third inner lead end 601 on the W phase copper busbar 6 is connected to the first hairpin 8 in a counterclockwise direction as the starting point of the inner winding; at the same time, the third outer lead end 602 is connected to another first hairpin 8 in a clockwise direction as the starting point of the outer winding.

[0074] In addition, there are 3 inner neutral terminals 701 and 3 outer neutral terminals 702 on the neutral row 7, and one of the inner neutral terminals 701 corresponds to the third inner lead terminal 601, serving as the end point of the inner winding; at the same time, one of the outer neutral terminals 702 corresponds to the third outer lead terminal 602, serving as the end point of the outer winding.

[0075] In addition, a third hairpin 10 is provided in the innermost layer of the insulating groove 101 to commutate the outer winding, and a third hairpin 10 is provided in the outermost layer of the insulating groove 101 to commutate the inner winding.

[0076] The winding configuration of the inner winding is as follows:

[0077] Layer 1 → Layer 2 → Layer 1 → Layer 2 → Layer 1 → Layer 2 (1 first hairpin 8 and 3 second hairpins 9), then flow across layers to → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 (4 second hairpins 9 in total), then flow across layers to → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 → Layer 6 (3 second hairpins 9 in total), then change direction through the first outermost third hairpin 10 (reverse twist hairpin) → Layer 6 → Layer 5 → Layer 6 Layer 1 → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 (4 second hairpins 9 in total), then flow across layers to → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 (4 second hairpins 9 in total), then flow across layers to → Layer 2 → Layer 1 → Layer 2 → Layer 1 → Layer 2 → Layer 1 → Layer 2 → Layer 1 (4 second hairpins 9 in total), then lead out through the inner neutral terminal 701, and finally perform three-phase UVW terminal electrical short-circuit bridging through neutral bus 7.

[0078] The winding configuration of the outer ring is as follows:

[0079] Layer 6 → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 (1 first hairpin 8 and 3 second hairpins 9), then flow across layers to → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 (4 second hairpins 9 in total), then flow across layers to → Layer 2 → Layer 1 → Layer 2 → Layer 1 → Layer 2 → Layer 1 (3 second hairpins 9 in total), then change direction through the first innermost third hairpin 10 (reverse twist hairpin) → Layer 1 Layer 1 → Layer 2 → Layer 1 → Layer 2 → Layer 1 → Layer 2 (4 second hairpins 9 in total), then flow across layers to → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 3 → Layer 4 → Layer 4 (4 second hairpins 9 in total), then flow across layers to → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 → Layer 6 → Layer 5 → Layer 6 (4 second hairpins 9 in total), then lead out through the external neutral terminal 702, and finally perform three-phase UVW terminal electrical short-circuit bridging through neutral bus 7.

[0080] The above describes the winding structure of the W-phase winding.

[0081] Combined Figure 1 Both the U-phase winding and the V-phase winding are wound with the same structure as the W-phase winding. In this way, the three-phase copper busbar and the neutral busbar are concentrated together, with the inner lead end and the outer lead end alternating, and the inner neutral end 701 and the outer neutral end 702 alternating, resulting in a more compact layout.

[0082] like Figure 14 The diagram shows the three-phase winding unfolded, where A1+, B1+, and C1+ correspond to the first inner lead terminal 401, the second inner lead terminal 501, and the third inner lead terminal 601, respectively; A2+, B2+, and C2+ correspond to the first outer lead terminal 402, the second outer lead terminal 502, and the third outer lead terminal 602, respectively; and A1-, B1-, and C1- correspond to the inner neutral terminal 701, while A2-, B2-, and C2- correspond to the outer neutral terminal 702. The diagram also shows 48 insulating grooves 101 with a span of 6.

[0083] like Figure 15 The diagram shows the unfolded shape of a unidirectional winding, where C1+ and C2+ are the inner and outer lead ends, and C1- and C2- are the inner neutral end 701 and the outer neutral end 702. In addition, there are 48 insulating slots 101 corresponding to the winding in the diagram, with a span of 6.

[0084] 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 of a stator of a flat wire motor characterized by comprising: It includes stator core (1), three-phase winding, three-phase copper busbar and neutral busbar (7); The three-phase windings are installed in the stator core (1); Each phase of the three-phase copper busbar is provided with an inner lead end and an outer lead end; The neutral bar (7) is provided with an inner neutral end (701) and an outer neutral end (702). Each unidirectional winding in the three-phase winding includes an outer winding and an inner winding; One end of the outer winding is connected to the outer lead end, and the other end is connected to the outer neutral end (702); One end of the inner winding is connected to the inner lead end, and the other end is connected to the inner neutral end (701); The stator core (1) is in the shape of a ring, and the inner ring surface is provided with a number of insulating grooves (101) along the radial direction. The three-phase winding includes a U-phase winding, a V-phase winding, and a W-phase winding; The U-phase winding, V-phase winding, and W-phase winding all include an outer winding and an inner winding; Both the outer and inner windings are installed in the insulating slot (101); Both the outer and inner windings include a first hairpin (8), a second hairpin (9), and a third hairpin (10). One end of the first hairpin (8) is connected to the inner lead or the outer lead, and the other end is connected to several second hairpins (9) in a clockwise or counterclockwise direction until the second hairpin (9) is connected to one end of the third hairpin (10); The other end of the third hairpin (10) is connected to several second hairpins (9) in a counterclockwise or clockwise direction until the second hairpins (9) are connected to the inner neutral end (701) or the outer neutral end (702).

2. A winding structure for a stator of a flat wire motor according to claim 1, characterized in that, The three-phase copper busbars include a U-phase copper busbar (4), a V-phase copper busbar (5), and a W-phase copper busbar (6), all of which are arc-shaped; The inner lead ends are respectively set on the inner arc surfaces of the U-phase copper busbar (4), the V-phase copper busbar (5) and the W-phase copper busbar (6); The external lead ends are respectively set on the outer arc surfaces of the U-phase copper busbar (4), V-phase copper busbar (5) and W-phase copper busbar (6).

3. A winding structure for a stator of a flat wire motor according to claim 2, characterized in that The inner lead terminal includes a first inner lead terminal (401), a second inner lead terminal (501), and a third inner lead terminal (601). The external lead ends include a first external lead end (402), a second external lead end (502) and a third external lead end (602). The first inner lead end (401) is located on the inner arc surface of the U-phase copper busbar (4), and the first outer lead end (402) is located on the outer arc surface of the U-phase copper busbar (4). The second inner lead end (501) is located on the inner arc surface of the V-phase copper busbar (5), and the second outer lead end (502) is located on the outer arc surface of the V-phase copper busbar (5); The third inner lead end (601) is located on the inner arc surface of the W phase copper busbar (6), and the third outer lead end (602) is located on the outer arc surface of the W phase copper busbar (6).

4. The winding structure of a flat wire motor stator according to claim 2, characterized in that, The U-phase copper busbar (4) has a first terminal (403) at one end, the V-phase copper busbar (5) has a second terminal (503) at one end, and the W-phase copper busbar (6) has a third terminal (603) at one end.

5. The winding structure of a flat wire motor stator according to claim 1, characterized in that, The first hairpin (8) is U-shaped, and a first welding head (801) is provided at the opening of the U-shape, which is opposite to each other.

6. The winding structure of a flat wire motor stator according to claim 1, characterized in that, The second hairpin (9) is U-shaped, and a second welding head (901) is provided at the opening of the U-shape, which is opposite to each other.

7. The winding structure of a flat wire motor stator according to claim 1, characterized in that, The third hairpin (10) is U-shaped, and a third welding head (1001) facing the same direction is provided at the opening of the U-shape.

8. The winding structure of a flat wire motor stator according to any one of claims 1-7, characterized in that, The neutral row (7) is arc-shaped, the inner neutral end (701) is located on the inner arc surface of the neutral row (7), and the outer neutral end (702) is located on the outer arc surface of the neutral row (7).

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