Flat wire motor stator winding structure

Abstract

The application provides a flat wire motor stator winding structure, which comprises a stator core, three-phase lead-out wire clamps, U-shaped clamps and reverse twist clamps, the stator core is provided with a plurality of uniformly distributed winding grooves in the axial direction, three-phase windings are wound in the winding grooves, each phase winding in the three-phase windings comprises a first winding and a second winding. By using the first winding and the second winding, the outer side wire-in and wire-out mode (or the inner side wire-in and wire-out mode) is used in the arrangement and installation of the flat wire motor winding, the problem that the three-phase ends and the neutral point of the winding are difficult to connect and process due to the existing inner side wire-in and outer side wire-out and outer side wire-in and inner side wire-out can be solved; by using the inner layer or outer layer reverse twist clamps, the U-shaped clamps realize the commutation connection of the current in the winding, replace the bridging of the special-shaped wire, simplify the wire end structure, and increase the reliability of the connection.

Description

Technical Field

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

[0002] A flat-wire motor is a type of three-phase motor. When symmetrical three-phase alternating current is applied to the three-phase stator windings, a rotating magnetic field is generated that rotates clockwise at synchronous speed along the inner space of the stator and rotor. Since the rotating magnetic field rotates at synchronous speed, and the rotor conductors are initially stationary, they cut into the stator's rotating magnetic field, generating an induced electromotive force (EMF) (the direction of the induced EMF is determined by the right-hand rule). Because the rotor conductors are short-circuited by short-circuit rings, an induced current, roughly in the same direction as the induced EMF, is generated in the rotor conductors. The current-carrying conductors of the rotor experience an electromagnetic force in the stator's magnetic field (the direction of the force is determined by the left-hand rule). This electromagnetic force generates an electromagnetic torque on the rotor shaft, driving the rotor to rotate along the direction of the rotating magnetic field.

[0003] The existing flat wire motors have windings that enter from the inside of the stator slot and exit from the outside, or enter from the outside and exit from the inside. This results in dispersed exit positions, occupying a large amount of end space, and making it difficult to connect the three phases at the ends of the windings and the neutral point. In addition, the current commutation of a certain phase branch of the existing flat wire stator winding uses a special-shaped wire, which is installed at the end of the stator winding. Summary of the Invention

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

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

[0006] A stator winding structure for a flat wire motor includes a stator core, three-phase lead wire clips, a U-shaped clip, and a reverse-torsion clip;

[0007] The stator core has several evenly distributed winding slots along the axial direction.

[0008] A three-phase winding is wound in the winding slot, and the three-phase winding is divided into several layers along the radial direction of the stator core.

[0009] Each phase winding in the three-phase winding includes a first winding and a second winding;

[0010] The first winding starts with the three-phase lead wire hairpins of the first layer and connects several U-shaped hairpins in a clockwise or counterclockwise direction along the stator core until it connects to the reverse twist hairpins of the last layer.

[0011] The second winding starts from the anti-torsion hairpin of the last layer of the first winding, and connects several U-shaped hairpins in a counterclockwise or clockwise direction along the stator core until the U-shaped hairpins fill the first layer of the first winding, and the last U-shaped hairpin is located on the side of the three-phase lead hairpin at the starting point.

[0012] Preferably, the number of winding slots is 48 or 64.

[0013] Preferably, the three-phase lead wire hairpin body is U-shaped, with opposing first bends at both ends of the U-shaped opening, and the two first bends are respectively connected to first lead wires of different lengths;

[0014] The U-shaped hair clip body is U-shaped, and the two ends of the U-shaped opening are provided with opposing second bends. Each of the two second bends is connected to a second lead wire of equal or unequal length.

[0015] The main body of the anti-twist hair clip is U-shaped, with a third bend in the same direction at both ends of the U-shaped opening, and each of the two third bends is provided with a third lead wire of equal length.

[0016] Preferably, the U-shaped bodies of the three-phase lead wire hairpin, the U-shaped hairpin, and the anti-twist hairpin are all inserted into the winding groove;

[0017] The three-phase lead wire hairpin and the U-shaped hairpin are connected by welding the first lead wire and the second lead wire that are stacked on top of each other;

[0018] The two U-shaped hairpins are welded together by stacked second leads;

[0019] The U-shaped hairpin and the reverse twist hairpin are welded together by stacked second and third leads.

[0020] Preferably, the closed ends of the three-phase lead wire clips, U-shaped clips, and reverse twist clips are all located at one end of the stator core, forming the clip end;

[0021] The opening side of the phase lead wire clip, U-shaped clip, and reverse twist clip is located at the other end of the stator core, forming a welding end.

[0022] Preferably, the three-phase winding is further connected to a three-phase copper busbar.

[0023] Preferably, the three-phase copper busbar includes a U-phase copper busbar, a V-phase copper busbar, and a W-phase copper busbar;

[0024] The U-phase copper busbar is arc-shaped, with a first terminal and at least two first contact wires at each end;

[0025] The V-phase copper busbar is arc-shaped, with a second terminal and at least two second contact wires at each end;

[0026] The W-phase copper busbar is arc-shaped, with a third terminal and at least two third contact lines at each end.

[0027] Preferably, the first contact wire, the second contact wire, and the third contact wire correspond to each phase winding in the three-phase winding, and are respectively welded to the first lead wire of the three-phase lead wire hairpin in each phase winding.

[0028] Preferably, the three-phase winding is connected to a neutral bus.

[0029] Preferably, the neutral bar is arc-shaped, and three sets of neutral lines are fixedly connected along the inner arc surface, with each set including at least two neutral lines;

[0030] The neutral wire of each group is welded to the second lead of the last two U-shaped hairpins of the second winding in each phase winding.

[0031] Preferably, the winding groove is a rectangular groove, and insulating paper for insulation is inserted inside.

[0032] The beneficial effects of this invention are:

[0033] This invention, by using a first winding and a second winding, employs an outer-in, outer-out configuration (or an inner-in, inner-out configuration) in the arrangement and installation of the flat wire motor windings. This solves the problem of difficulty in connecting the three phases at the three-phase ends and the neutral point caused by existing inner-in, outer-out, or outer-in, inner-out configurations. The incoming and outgoing lines are concentrated, occupying less space. This solution uses an inner or outer reverse-twist hairpin to enable the U-shaped hairpin to achieve the commutation connection of the current in the windings, replacing the bridging of irregularly shaped wires, simplifying the structure at the outgoing end, and increasing the reliability of the connection.

[0034] 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

[0035] 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.

[0036] Figure 1 An assembly diagram of a flat wire motor stator winding structure according to the present invention is shown;

[0037] Figure 2A schematic diagram of a single-phase winding of a flat wire motor stator winding structure according to the present invention is shown.

[0038] Figure 3 It shows Figure 2 A magnified view of area A in the middle;

[0039] Figure 4 A schematic diagram of the three-phase lead wire hairpin of the present invention is shown;

[0040] Figure 5 A schematic diagram of the structure of the U-shaped hair clip of the present invention is shown;

[0041] Figure 6 A schematic diagram of the anti-twist hair clip of the present invention is shown;

[0042] Figure 7 A schematic diagram of the U-phase copper busbar of the present invention is shown;

[0043] Figure 8 A schematic diagram of the V-phase copper busbar of the present invention is shown;

[0044] Figure 9 A schematic diagram of the structure of the W-phase copper busbar of the present invention is shown;

[0045] Figure 10 A schematic diagram of the structure of the neutral packing of the present invention is shown;

[0046] Figure 11 A schematic diagram of the installation of the three-phase lead wire clips and the three-phase copper busbars is shown;

[0047] Figure 12 A schematic diagram of the installation of the U-shaped hair clip is shown;

[0048] Figure 13 A schematic diagram of the installation of the reverse twist hair clip is shown;

[0049] Figure 14 A schematic diagram of the installation of the U-shaped hair clip and neutral bar is shown;

[0050] Figure 15 The diagram shows the unfolded three-phase winding of the present invention;

[0051] Figure 16 A single-phase winding development diagram of the present invention is shown.

[0052] In the diagram: 1. Stator core; 2. Insulating paper; 3. Hairpin end; 4. Welding end; 5. Neutral busbar; 501. Neutral wire; 6. Winding groove; 7. U-phase copper busbar; 701. First contact wire; 702. First terminal; 8. Three-phase lead-out hairpin; 801. First bend; 802. First lead-out; 9. U-shaped hairpin; 901. Second bend; 902. Second lead-out; 10. Reverse twist hairpin; 1001. Third bend; 1002. Third lead-out; 11. V-phase copper busbar; 1101. Second contact wire; 1102. Second terminal; 12. W-phase copper busbar; 1201. Third contact wire; 1202. Third terminal. 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 stator winding structure for a flat wire motor, such as Figure 1 As shown, it includes a stator core 1, three-phase lead wire hairpins 8, U-shaped hairpins 9, and reverse twist hairpins 10. The stator core 1 has several evenly distributed rectangular winding slots 6 along the axial direction. Considering insulation, a certain length and thickness of insulating paper 2 is inserted into each slot. The number of winding slots 6 is 48 or 64. Then, three-phase windings are wound in the winding slots 6, and the three-phase windings are divided into several layers along the radial direction of the stator core 1.

[0055] It should be noted that the stator core 1 is made of multiple silicon steel sheets stacked together, which can be done by riveting, welding or bonding, etc., and includes the stator yoke, stator teeth and stator teeth head.

[0056] In addition, such as Figure 2 As shown, each phase winding in the three-phase winding includes a first winding and a second winding. The first winding starts from the three-phase lead wire hairpin 8 of the first layer and connects several U-shaped hairpins 9 in a clockwise or counterclockwise direction along the stator core 1 until it connects to the anti-twist hairpin 10 of the last layer.

[0057] The second winding starts from the anti-torsion hairpin 10 of the last layer of the first winding, and connects several U-shaped hairpins 9 in a counterclockwise or clockwise direction along the stator core 1 until the U-shaped hairpins 9 fill the first layer of the first winding. The last U-shaped hairpin 9 is 45° away from the side of the three-phase lead hairpin 8 at the starting point.

[0058] It should be noted that the three-phase lead wire clip 8 and the U-shaped clip 9 are usually paired up, so the actual angular distance between the first three-phase lead wire clip 8 and the second to last U-shaped clip 9 is 45°.

[0059] like Figure 4 As shown, the three-phase lead wire hairpin 8 has a U-shaped main body, with opposing first bends 801 at both ends of the U-shaped opening, and the two first bends 801 are respectively connected to first lead wires 802 of different lengths.

[0060] like Figure 5 As shown, the main body of the U-shaped hairpin 9 is U-shaped, and the two ends of the U-shaped opening are provided with opposing second bending parts 901. Both second bending parts 901 are connected to second lead wires 902 of equal or unequal length.

[0061] It should be noted that, in combination Figure 14 When the U-shaped hairpin 9 is connected to the neutral bar 5, the length of the second lead 902 is not equal; otherwise, the length of the second lead 902 of the U-shaped hairpin 902 is equal.

[0062] like Figure 6 As shown, the main body of the reverse twist hair clip 10 is U-shaped, and the two ends of the U-shaped opening are provided with third bending parts 1001 in the same direction. Both third bending parts 1001 are provided with third lead wires 1002 of equal length.

[0063] Furthermore, the closed ends of the three-phase lead wire hairpin 8, U-shaped hairpin 9, and anti-twist hairpin 10 are all located at one end of the stator core 1, forming the hairpin end 3; then the open sides of the three-phase lead wire hairpin 8, U-shaped hairpin 9, and anti-twist hairpin 10 are all located at the other end of the stator core 1, forming the welding end 4.

[0064] Furthermore, the U-shaped bodies of the three-phase lead wire hairpin 8, the U-shaped hairpin 9, and the anti-twist hairpin 10 are all inserted into the winding groove 6;

[0065] The three-phase lead wire hairpin 8 and the U-shaped hairpin 9 are welded together by the first lead wire 802 and the second lead wire 902 that are stacked on top of each other.

[0066] The two U-shaped hairpins 9 are welded together by stacked second leads 902;

[0067] The U-shaped hairpin 9 and the reverse twist hairpin 10 are welded together by a second lead 902 and a third lead 1002 that are stacked on top of each other.

[0068] It should be noted that each of the three-phase lead wire hairpins 8, U-shaped hairpins 9, and reverse twist hairpins 10 is a flat copper conductor. Each winding slot 6 can accommodate 2n (n is a natural number) flat copper conductors. In addition, in order to achieve electrical connection between the flat conductors in the winding slot 6, hairpins or welding are required to connect them, thus forming the three-phase lead wire hairpins 8, U-shaped hairpins 9, and reverse twist hairpins 10.

[0069] Taking the stator core 1 with 48 winding slots 6 as an example, the following explanation is given for one phase of the three-phase winding:

[0070] Combination Figure 2 and Figure 3 Starting with the three-phase lead wire clip 8, U-shaped bodies are inserted into the winding slots 6. The U-shaped bodies can have various spans, such as a combination of 6 spans, 5 spans, or 7 spans. Then, the three-phase lead wire clips 8 are connected to U-shaped clips 9, distributed along the circumference of the stator core 1 according to the aforementioned span pattern. Each slot can hold 2n U-shaped bodies, resulting in n layers of U-shaped bodies per slot (with two stacked U-shaped bodies forming one layer). Figure 2 In the case of n=3, the layer closest to the bottom of the winding slot 6 is designated as the outer layer, and the layer closest to the opening of the winding slot 6 is designated as the inner layer. U-shaped hairpins 9 are inserted into the winding slot 6 with a prescribed span until a complete circle is completed, at which point the next pair of adjacent layers is switched for cyclic installation. Therefore, after the U-shaped hairpins 9 are inserted clockwise or counterclockwise to form a circle, they will connect with the U-shaped hairpins 9 of the second layer. Then, after the second layer forms a circle, the last U-shaped hairpin 9 of the second layer connects with the first U-shaped hairpin of the third layer. This pattern continues until the third layer forms a circle, and the tail of the third layer will use a reverse twist hairpin 10. These coils from the three-phase lead hairpins 8 to the reverse twist hairpins 10 constitute the first winding.

[0071] The reverse twisting hairpin 10 changes the insertion direction of the U-shaped hairpin 9. The second winding starts with the reverse twisting hairpin 10 and inserts the U-shaped hairpin 9 in the opposite direction. For example, if the first winding is clockwise, then the second winding is counterclockwise. After forming a circle on the last layer with the same span as the first winding, the U-shaped hairpin 9 at the end of the last layer is connected to the U-shaped hairpin 9 of the second to last layer, until it is connected to the first layer, forming a circle on the first layer.

[0072] It should be noted that the advantage of this winding arrangement is that the first lead 802 of the three-phase lead-out card and the second lead 902 of the U-shaped lead-out card 9 will be concentrated on one side of the stator core 1 and will be clustered together.

[0073] It should be noted that the first lead 802 of the three-phase winding is generally located on the outermost layer of the winding slot 6.

[0074] It should be noted that in the reversing connection of the U-shaped hairpin 9, the reverse twist hairpin 10 is used for connection. These reverse twist hairpins 10 are located in the innermost or outermost layer of the winding groove 6.

[0075] It should be noted that, as Figure 3 As shown, in the three-phase UVW, the current flows through two parallel branches of each phase, entering through the first lead-out 802, passing through the outermost three-phase lead-out clips 8 and U-shaped clips 9 sequentially from layer 1a → layer 1b → layer 1a → layer 1b → layer 1a → layer 1b → layer 1a → layer 1b (a total of 6 U-shaped clips 9 and two three-phase lead-out clips 8), then across layers to layer 2a → layer 2b → layer 2a → layer 2b → layer 2a → layer 2b → layer 2a → layer 2b (a total of 8 U-shaped clips 9), then across layers to layer 3a → layer 3b → layer 3a → layer 3b → layer 3a → layer 3b → layer 3a → layer 3b Layer b (6 U-shaped hairpins 9 in total), then through the innermost 2 adjacent reverse twist hairpins 10 to achieve turning → Layer 3b → Layer 3a → Layer 3b → Layer 3a → Layer 3b → Layer 3a (8 U-shaped hairpins 9 in total), then flow across layers to → Layer 2b → Layer 2a → Layer 2b → Layer 2a → Layer 2b → Layer 2a → Layer 2b → Layer 2a (8 U-shaped hairpins 9 in total), then flow across layers to Layer 1b → Layer 1a → Layer 1b → Layer 1a → Layer 1b → Layer 1a (8 U-shaped hairpins 9 in total), from the outermost layer, the neutral line 501 is led out, and the U, V, W three-phase endpoints are bridged through the neutral row 5.

[0076] Furthermore, in Figure 1 In the middle, the three-phase winding is also connected to a three-phase copper busbar, which includes a U-phase copper busbar 7, a V-phase copper busbar 11 and a W-phase copper busbar 12;

[0077] Among them, such as Figure 7 As shown, the U-phase copper busbar 7 is arc-shaped, with a first terminal 702 and at least two first contact lines 701 at each end.

[0078] like Figure 8 As shown, the V-phase copper busbar 11 is arc-shaped, with a second terminal 1102 and at least two second contact lines 1101 at each end.

[0079] like Figure 9 As shown, the W-phase copper busbar 12 is arc-shaped, with a third terminal 1202 and at least two third contact lines 1201 at each end.

[0080] Furthermore, the first contact wire 701, the second contact wire 1101, and the third contact wire 1201 correspond to each phase winding in the three-phase winding, and are respectively welded to the first lead wire 802 of the three-phase lead wire hairpin 8 in each phase winding. Additionally, combined with... Figure 11 It can be seen that the longer first lead 802 is connected to the three-phase copper busbar.

[0081] Combination Figure 1 and Figure 10 The three-phase winding is also connected to a neutral busbar 5. The neutral busbar 5 is arc-shaped and has three sets of neutral lines 501 fixedly connected along its inner arc surface. Each set includes at least two neutral lines 501. Each set of neutral lines 501 is welded to the second lead 902 of the last two U-shaped hairpins 9 of the second winding in each phase winding.

[0082] like Figure 11 As shown in the diagram, the U-phase copper busbar 7, V-phase copper busbar 11, and W-phase copper busbar 12 are respectively connected to two three-phase lead-out clips 8, and then combined with... Figure 12 The three-phase lead wire clip 8 is used as the starting point to connect to the U-shaped clip 9, and then combined with... Figure 13 The U-shaped hairpin 9 will eventually connect to the reverse twist hairpin 10 for reversal, and then... Figure 14 As shown, the U-shaped hairpins 9 in the three-phase winding will eventually converge at the position of the neutral busbar 5, and the U-phase copper busbar 7, V-phase copper busbar 11, W-phase copper busbar 12 and neutral busbar 5 will converge together.

[0083] like Figure 15 As shown in the figure, A1+ and A2+ represent the lead wires on the single-phase (U-phase, V-phase or W-phase) copper busbar, A1- and A2- represent the neutral line 501 on the neutral busbar 5, and the numbers 1-48 represent 48 winding slots 6, and the span in the figure is 6.

[0084] like Figure 16 As shown in the figure, A1+, A2+, B1+, B2+, C1+ and C2+ represent the lead wires of the three-phase copper busbar, A1-, A2-, B1-, B2-, C1- and C2- represent the neutral line 501 on the neutral busbar 5, and the numbers 1-48 represent 48 winding slots 6, and the span in the figure is 6.

[0085] 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 stator winding structure for a flat wire motor, characterized in that, Including stator core (1), three-phase lead wire clips (8), U-shaped clips (9) and reverse twist clips (10); The stator core (1) has several evenly distributed winding slots (6) along the axial direction. The winding slot (6) is provided with a three-phase winding, which is divided into several layers along the radial direction of the stator core (1); Each phase winding in the three-phase winding includes a first winding and a second winding; The first winding starts from the three-phase lead wire hairpin (8) of the first layer and connects several U-shaped hairpins (9) in a clockwise or counterclockwise direction along the stator core (1) until it connects to the anti-twist hairpin (10) of the last layer. The second winding starts from the anti-torsion hairpin (10) of the last layer of the first winding and connects several U-shaped hairpins (9) in a counterclockwise or clockwise direction along the stator core (1) until the U-shaped hairpins (9) fill the first layer of the first winding and the last U-shaped hairpin (9) is located on the side of the three-phase lead hairpin (8) at the starting point. The number of winding slots (6) is 48 or 64, and the span between the three-phase lead wire clips (8) and the U-shaped clips (9) is 6.

2. The stator winding structure of a flat wire motor according to claim 1, characterized in that, The three-phase lead wire hairpin (8) is U-shaped, with opposing first bends (801) at both ends of the U-shaped opening. The two first bends (801) are respectively connected to first lead wires (802) of different lengths. The main body of the U-shaped hairpin (9) is U-shaped, and the two ends of the U-shaped opening are provided with opposing second bends (901). The two second bends (901) are connected to second lead wires (902) of equal or unequal length. The main body of the reverse twist hairpin (10) is U-shaped, and the two ends of the U-shaped opening are provided with third bending parts (1001) in the same direction. Both of the third bending parts (1001) are provided with third lead wires (1002) of equal length.

3. The stator winding structure of a flat wire motor according to claim 2, characterized in that, The U-shaped bodies of the three-phase lead wire hairpin (8), U-shaped hairpin (9) and anti-twist hairpin (10) are all inserted into the winding groove (6); The three-phase lead wire hairpin (8) and the U-shaped hairpin (9) are connected by welding the first lead wire (802) and the second lead wire (902) that are stacked on each other; The two U-shaped hairpins (9) are welded together by stacked second leads (902); The U-shaped hairpin (9) and the reverse twist hairpin (10) are welded together by a second lead (902) and a third lead (1002) that are stacked on top of each other.

4. The stator winding structure of a flat wire motor according to claim 3, characterized in that, The closed ends of the three-phase lead-out hairpin (8), U-shaped hairpin (9) and anti-twist hairpin (10) are all located at one end of the stator core (1), forming the hairpin end (3). The opening side of the three-phase lead wire hairpin (8), U-shaped hairpin (9) and anti-twist hairpin (10) is located at the other end of the stator core (1), forming a welding end (4).

5. The stator winding structure of a flat wire motor according to claim 4, characterized in that, The three-phase winding is also connected to a three-phase copper busbar.

6. The stator winding structure of a flat wire motor according to claim 5, characterized in that, The three-phase copper busbar includes a U-phase copper busbar (7), a V-phase copper busbar (11), and a W-phase copper busbar (12). The U-phase copper busbar (7) is arc-shaped, with a first terminal (702) and at least two first contact lines (701) respectively at both ends. The V-phase copper busbar (11) is arc-shaped, with a second terminal (1102) and at least two second contact lines (1101) respectively at both ends. The W-phase copper busbar (12) is arc-shaped, with a third terminal (1202) and at least two third contact lines (1201) at each end.

7. The stator winding structure of a flat wire motor according to claim 6, characterized in that, The first contact line (701), the second contact line (1101) and the third contact line (1201) correspond to each phase winding in the three-phase winding, and are respectively welded to the first lead (802) of the three-phase lead hairpin (8) in each phase winding.

8. The stator winding structure of a flat wire motor according to claim 2, characterized in that, The three-phase winding is connected to a neutral bus (5).

9. The stator winding structure of a flat wire motor according to claim 8, characterized in that, The neutral bar (5) is arc-shaped and has three sets of neutral lines (501) fixedly connected along the inner arc surface, and each set includes at least two neutral lines (501). The neutral line (501) of each group is welded to the second lead (902) of the last two U-shaped hairpins (9) of the second winding in each phase winding.

10. A stator winding structure for a flat wire motor according to any one of claims 1-9, characterized in that, The winding groove (6) is a rectangular groove, and insulating paper (2) for insulation is inserted inside.

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