Short-pitch flat wire motor stator and winding structure thereof

Abstract

The present application relates to the technical field of flat wire motor, and discloses a short-distance flat wire motor stator and a winding structure thereof, wherein the winding structure comprises a plurality of hairpins, the hairpins comprise first hairpins, second hairpins and third hairpins, two straight line segments of the plurality of hairpins are arranged in the interiors of a plurality of stator slots and are connected to each other to form a plurality of loops, and 2n layers of structures are formed in the interiors of the stator slots, wherein n is a positive integer. The winding structure of the short-distance flat wire motor stator provided by the present application is connected in a certain order by the plurality of first hairpins, second hairpins and third hairpins in adjacent two layers to form a wiring mode with a plurality of loop short-distance, which can effectively avoid circulating current, reduce harmonic influence, improve the performance and reliability of the motor, and also make the lead-out wires more concentrated, thereby reducing the volume of the plurality of wiring copper bars and neutral point copper bars, and thus reducing the cost.

Description

Technical Field

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

[0002] An electric motor is an electromagnetic device that converts or transmits electrical energy based on the law of electromagnetic induction. Existing round wire motors have a slot fill factor of around 40%, while hairpin flat wire motors have a slot fill factor of over 60%. For the same volume, the increased slot fill factor of a hairpin motor leads to higher power density. Therefore, hairpin stator technology has developed rapidly. A hairpin stator is a winding stator that includes multiple hairpin coils arranged in a specific pattern.

[0003] Most existing flat wire stator windings use multi-branch full-pitch wiring, forming a circuit through a large busbar structure. However, this multi-branch full-pitch wiring method can lead to imbalances and circulating currents between winding branches during motor operation, resulting in a large number of harmonics in the magnetic field, which in turn reduces the quality and reliability of the motor. Summary of the Invention

[0004] The purpose of this invention is to overcome the problems of imbalance between windings and the generation of a large number of harmonics in the magnetic field caused by inter-branch circulating currents in the prior art, and to provide a short-pitch flat wire motor stator and its winding structure, which has the function of avoiding the generation of circulating currents between branches.

[0005] To achieve the above objectives, the present invention provides a short-pitch flat wire motor stator winding structure, comprising:

[0006] Multiple hairpins, including a first type of hairpin, a second type of hairpin, and a third type of hairpin, wherein two straight segments of the multiple hairpins are respectively disposed inside multiple stator slots and connected to each other to form multiple loops, and form a 2n-layer structure inside the corresponding stator slots, where n is a positive integer;

[0007] Multiple lead wires are respectively set on the straight segment of the hairpin at the beginning of the circuit and on the straight segment of the hairpin at the end of the circuit;

[0008] Multiple copper busbars are connected to multiple leads, and each is used to connect to three terminals.

[0009] A neutral point copper busbar is connected to multiple leads.

[0010] Optionally, each phase winding includes line one and line two, which are connected in series or in parallel. The stator slot has 6 layers, and the number of stator slots includes 48 slots.

[0011] Optionally, the fifth and sixth layers of the first line include three first-type hairpins, two second-type hairpins, and three third-type hairpins, with the current flow direction being first-type hairpin-third-type hairpin-first-type hairpin-second-type hairpin-third-first-type hairpin-third-second-type hairpin, and the lead wire is disposed on the straight segment of the first first-type hairpin in the fifth and sixth layers of the first line.

[0012] Optionally, the third and fourth layers of the first line include three first-type hairpins, two second-type hairpins, and three third-type hairpins, with the current flow direction being first-type hairpin-third-type hairpin-first-type hairpin-second-type hairpin-third-first-type hairpin-third-second-type hairpin. The first first-type hairpin of the third and fourth layers of the first line is connected to the last second-type hairpin of the fifth and sixth layers of the first line.

[0013] Optionally, the first and second layers of the first line include three first-type hairpins, two second-type hairpins, and three third-type hairpins. The current flow direction is first-type hairpin-third-type hairpin-first-type hairpin-second-type hairpin-third-first-type hairpin-third-second-type hairpin. The first first-type hairpin of the first and second layers of the first line is connected to the last second-type hairpin of the third and fourth layers of the first line. The lead wire is arranged on the straight segment of the last second-type hairpin of the first and second layers of the first line.

[0014] Optionally, the first and second layers of the second line include three first-type hairpins, two second-type hairpins, and three third-type hairpins, with the current flow direction being second-type hairpin-third-type hairpin-first-type hairpin-third-second-type hairpin-first-type hairpin-third-first-type hairpin, and the lead wire is arranged on the straight segment of the first second-type hairpin of the first and second layers of the second line.

[0015] Optionally, the third and fourth layers of the second line include three first-type hairpins, two second-type hairpins, and three third-type hairpins, with the current flow direction being second-type hairpin-third-type hairpin-first-type hairpin-third-second-first-type hairpin-third-first-type hairpin, and the first second-type hairpin of the third and fourth layers of the second line is connected to the last first-type hairpin of the first and second layers of the second line.

[0016] Optionally, the fifth and sixth layers of the second line include three first-type hairpins, two second-type hairpins, and three third-type hairpins, with the current flow direction being second-type hairpin-third-first-type hairpin-third-second-first-third-first-first-third-first-first-second ...

[0017] Optionally, the span of the first type of hairpin is six, the span of the second type of hairpin is seven, and the span of the third type of hairpin is eight.

[0018] On the other hand, the present invention also provides a short-pitch flat wire motor stator, comprising:

[0019] The stator core is made of multiple silicon steel sheets stacked together, and multiple stator slots are formed on the inner circumference of the stator core;

[0020] Multiple insulating sheets are respectively arranged inside multiple stator slots;

[0021] The winding structure described above.

[0022] Through the above technical solution, the short-pitch flat wire motor stator winding structure provided by the present invention connects multiple first-type hairpins, second-type hairpins, and third-type hairpins in a certain order on adjacent layers to form a short-pitch wiring method for multiple circuits. This winding structure can effectively avoid circulating current and reduce harmonic effects to improve the performance and reliability of the motor. On the other hand, it can also make the lead wires more concentrated, thereby reducing the volume of multiple terminal copper busbars and neutral point copper busbars, thus reducing costs. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0024] Figure 2 This is a schematic diagram of the hairpin structure in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the connection between the lead wire and the hairpin in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0026] Figure 4 This is a schematic diagram of the combination of the first type of hairpin and the crown end of the third type of hairpin in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of the connection between the first type of hairpin and the third type of hairpin in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram showing the connection of the first type of hairpin, the second type of hairpin, and the third type of hairpin in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0029] Figure 7 This is a schematic diagram of the unfolded circuit one in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the unfolded circuit two in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the installation of a single-phase winding in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0032] Figure 10 This is a schematic diagram of the crown end of a single-phase winding in a stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0033] Figure 11 This is a schematic diagram showing the connection between the first and second layers of a single-phase winding in a stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0034] Figure 12 This is a schematic diagram of a circuit in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention;

[0035] Figure 13 This is a schematic diagram showing the connection between the first and second layers of a single-phase single-circuit stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0036] Figure 14 This is a schematic diagram of the innermost winding of a short-pitch flat wire motor stator winding structure according to an embodiment of the present invention.

[0037] Figure 15 This is a schematic diagram of the intermediate layer winding in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0038] Figure 16 This is a schematic diagram of the outermost winding of the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0039] Figure 17This is a schematic diagram of the unfolded single-phase winding in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0040] Figure 18 This is a schematic diagram of the three-phase winding unfolded in the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures

[0042] 1. Terminal block 2. Neutral point copper busbar

[0043] 3. Connecting copper busbar 4. Lead wire

[0044] 5. Hairpin 6. Stator core

[0045] 7. Stator slots 8. Insulating paper

[0046] 9. Type 1 hair clips 10. Type 3 hair clips

[0047] 11. Second type of card issuance Detailed Implementation

[0048] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0049] Figure 1 This is a schematic diagram of the stator winding structure of a short-pitch flat wire motor according to an embodiment of the present invention. Figure 1 In this short-pitch flat wire motor stator winding structure, multiple hairpins 5, multiple lead wires 4, multiple connecting copper busbars 4, and a neutral point copper busbar 2 may be included. Specifically, the hairpins 5 may include first-type hairpins 9, second-type hairpins 11, and third-type hairpins 10; such as Figure 2 The hair clip 5 shown may include two parallel straight segments. Specifically, one end of the two straight segments is connected by a V-shaped or U-shaped segment, and the other end is used to connect with the adjacent hair clip 5 by twisting and welding outwards, that is, the welding end.

[0050] Multiple hairpins 6 have straight segments respectively disposed inside multiple stator slots 7 and interconnected to form multiple loops. These loops form the three-phase windings of the stator, creating a 2n-layer structure within the corresponding stator slots 7, where n is a positive integer. Multiple lead-out wires 4 are respectively disposed on the straight segments of the hairpins 5 at the beginning and end of the loops. Specifically, they can be arranged as follows: Figure 3 As shown. Multiple copper busbars 3 are connected to multiple leads 4, and are used to connect to three terminals 1 respectively. The neutral point copper busbar 2 is connected to multiple leads 4.

[0051] When winding is required on the stator core 6, the straight segments of multiple first-type hairpins 9, multiple second-type hairpins 11, and multiple third-type hairpins 10 are placed inside the stator slots 7 in a specific order. Specifically, the first-type hairpin 9 has a span of six stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction; the second-type hairpin 11 has a span of seven stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction; and the third-type hairpin 10 has a span of eight stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction. After installing the multiple first-type hairpins 9, multiple second-type hairpins 11, and multiple third-type hairpins 10 into the corresponding stator slots 7, the welding ends of the multiple hairpins 5 are twisted and expanded outward to form multiple circuits. Specifically, the multiple circuits constitute multiple branches of the three-phase circuit. Multiple lead wires 4 are respectively set at the beginning and end of multiple circuits, that is, the soldered ends of the hairpins 5 at the beginning of the circuit that are not connected to other hairpins 5, and the soldered ends of the hairpins 5 at the end of the circuit that are not connected to other hairpins 5. Multiple copper busbars 3 are respectively connected to the lead wires 4 in the three-phase circuit, and the multiple copper busbars 3 are respectively connected to three terminals 1 to form a three-phase circuit. The neutral point copper busbar 2 can electrically short-circuit multiple three-phase circuits.

[0052] Traditional flat wire stator windings mostly employ branch-based wiring or short-pitch wiring with a variety of hairpins. This method can lead to imbalances and circulating currents between winding branches during motor operation, resulting in a large number of harmonics in the magnetic field and consequently reducing motor quality and reliability. In this embodiment of the invention, a combination of multiple first-type hairpins 9, second-type hairpins 11, and third-type hairpins 10 is used for wiring—that is, short-pitch wiring. This effectively avoids circulating currents and reduces harmonic effects. Furthermore, the invention uses fewer types of hairpins 5, without reverse-torsion or irregularly shaped hairpins, reducing the complexity of hairpin installation. Simultaneously, this short-pitch wiring method can effectively reduce the motor's 48th-order noise and improve the motor's NVH performance.

[0053] In this embodiment of the invention, such as Figure 1 and Figure 18 As shown, the circuit can include six. Specifically, each phase winding in the three-phase winding includes two circuits, namely line one and line two. The number of layers of the internal hairpin 5 of the stator slot 7 includes six layers, and the number of stator slots 7 includes 48 slots. Specifically, line one and line two can be connected in series or in parallel. Line one and line two connected in series constitute one six-layer circuit, and line one and line two connected in parallel constitute two six-layer circuits. Specifically, when line one and line two are connected in parallel, the number of leads 4 can include 12, and the connecting copper busbar 3 is connected to the corresponding lead 4 to form a three-phase circuit (line); there are 6 neutral point leads, and the neutral point copper busbar 2 is connected to the six neutral point leads to achieve electrical short circuit.

[0054] In this embodiment of the invention, the connection methods of the three-phase circuits are the same, but the connection methods of the two circuits (line one and line two) in each phase are different. Specifically, the number of layers of the welding end of the hairpin 5 inside the stator slot 7 is six, and the layer closest to the bottom of the stator slot 7 is defined as the outermost layer, that is, the fifth and sixth layers, as follows. Figure 16 As shown; the layer closest to the stator slot 7 opening is the innermost layer, that is, the first and second layers, as shown. Figure 14 As shown; the middle layers are the third and fourth layers, as... Figure 15 As shown.

[0055] In this embodiment of the invention, such as Figure 7 and Figure 12 As shown, the connection method and current flow direction of Line 1 can include flow in from the outermost layer and flow out from the innermost layer. Specifically, the fifth and sixth layers of Line 1 can include three first-type hairpins 9, two second-type hairpins 10, and three third-type hairpins 10. Specifically, the connection sequence and current flow direction of the fifth and sixth layers can include first-type hairpins 9, third-type hairpins 10, first-type hairpins 9, second-type hairpins 11, third-type hairpins 10, first-type hairpins 9, third-type hairpins 10, and second-type hairpins 11. The lead wire 4 is disposed on the soldering end of the first first-type hairpin 9 of the fifth and sixth layers of Line 1. The third and fourth layers of Line 1 include three first-type hairpins 9, two second-type hairpins 11, and three third-type hairpins 10. Specifically, the connection sequence and current flow direction of the third and fourth layers may include first type 9, third type 10, first type 9, second type 11, third type 10, first type 9, third type 10, and second type 11. The first first type 9 of the third and fourth layers of the first line is connected to the last second type 11 of the fifth and sixth layers of the first line. The first and second layers of the first line may include three third type 10s, two second type 11s, and three third type 10s. Specifically, the connection sequence and current flow direction of the first and second layers of the first line may include first type 9, third type 10, first type 9, second type 11, third type 10, first type 9, third type 10, and second type 11. The first type 1 hairpin 9 of the first and second layers of Line 1 is connected to the last type 2 hairpin 11 of the third and fourth layers of Line 1. Specifically, the connection diagram of the first and second layers can be shown as follows: Figure 11 and Figure 13 As shown. The lead wire 4 is located at the welding end of the last second-type hairpin 11 in the first and second layers of this line. Specifically, the combination diagram of the crown end of the first-type hairpin 9 and the third-type hairpin 10 can be seen. Figure 4As shown, the connection diagram of the first type of hair clip 9 and the third type of hair clip 10 can be as follows: Figure 5 As shown, the connection diagram of the first type of hairpin 9, the second type of hairpin 11, and the third type of hairpin 10 can be as follows: Figure 6 As shown.

[0056] This connection method allows adjacent hairpins 5 to be connected only between adjacent layers, meaning each hairpin 5 spans only one layer. Therefore, the welding ends of adjacent hairpins 5 have equal spans, resulting in identical twist angles at the welding ends. This reduces process complexity and cost, and improves production efficiency. Furthermore, the uniform distribution of the first type of hairpin 9, the second type of hairpin 11, and the third type of hairpin 10 effectively prevents circulating current. In addition, this wiring method ensures equal spacing between the three phases and concentrated placement of the lead-out wires 4, thereby reducing the volume of the connecting copper busbar 3 and the neutral point copper busbar 2. The neutral point copper busbar 2 can be made of flat copper, further reducing manufacturing costs.

[0057] In this embodiment of the invention, such as Figure 8 and Figure 12 As shown, the connection method and current flow direction of line two can include flow in from the innermost layer and flow out from the outermost layer, in the opposite direction to the circumferential direction of line one. Specifically, the starting slot of line two is the adjacent slot of line one along its circumferential direction. Specifically, the first and second layers of line two can include three first-type hairpins 9, two second-type hairpins 11, and three third-type hairpins 10. Specifically, the connection sequence and current flow direction of the first and second layers of line two can include second-type hairpins 11, third-type hairpins 10, first-type hairpins 9, third-type hairpins 10, second-type hairpins 11, first-type hairpins 9, third-type hairpins 10, and first-type hairpins 9. Specifically, the connection diagram of the first and second layers can be as follows. Figure 11 and Figure 13As shown. The lead wire is disposed on the soldered end of the first type 2 hairpin 11 of the first and second layers of line two, which is not connected to other hairpins 5. The third and fourth layers of line two may include three type 1 hairpins 9, two type 2 hairpins 11, and three type 3 hairpins 10. Specifically, the connection sequence and current flow direction of the third and fourth layers of line two may include type 2 hairpins 11, type 3 hairpins 10, type 1 hairpins 9, type 3 hairpins 10, type 2 hairpins 11, type 1 hairpins 9, type 3 hairpins 10, and type 1 hairpins 9. The first type 2 hairpin 11 of the third and fourth layers of line two is connected to the last type 1 hairpin 9 of the first and second layers of line two. The fifth and sixth layers of line two may include three type 1 hairpins 9, two type 2 hairpins 11, and three type 3 hairpins 10. Specifically, the connection sequence and current flow direction of the fifth and sixth layers of the second circuit may include second-type hairpin 11, third-type hairpin 10, first-type hairpin 9, third-type hairpin 10, second-type hairpin 11, first-type hairpin 9, third-type hairpin 10, and first-type hairpin 9. The first second-type hairpin 11 of the fifth and sixth layers of the second circuit is connected to the last first-type hairpin 9 of the third and fourth layers of the second circuit. The lead wire 4 is located at the solder end of the last first-type hairpin 9 of the fifth and sixth layers of the second circuit that is not connected to other hairpins 5. Specifically, the installation diagram of a single-phase (per-phase) winding can be as follows: Figure 9 As shown, the unfolded diagram can be as follows: Figure 17 As shown, the crown end schematic diagram of a single-phase winding can be as follows: Figure 10 As shown.

[0058] This connection method, namely the inner and outer layer entry and exit wire method, ensures that the lead wire 4 is not misaligned after twisting, and the maximum span between the two ends is only 75°, improving the reliability of the motor stator production and reducing the production defect rate. This structure results in six three-phase lead wires each on the innermost and outermost layers, which are relatively concentrated, while the neutral point lead wire is distributed with three on each of the innermost and outermost layers. Specifically, the unfolded diagram of the three-phase winding can be shown as follows... Figure 18 As shown.

[0059] In this embodiment of the invention, A, B, and C in the accompanying drawings represent three phases, A1 is line one, A2 is line two, and so on.

[0060] On the other hand, the present invention also provides a short-pitch flat wire motor stator. Specifically, the motor stator may include a stator core 6, multiple insulating sheets 8, and a winding structure. Specifically, the winding structure may include multiple hairpins 5, multiple lead wires 4, multiple connecting copper busbars 4, and a neutral point copper busbar 2. Specifically, the hairpins 5 may include a first type of hairpin 9, a second type of hairpin 11, and a third type of hairpin 10; the stator core 6 may include multiple stator slots 7; the hairpins 5 may include two parallel straight segments. Specifically, one end of the two straight segments is connected by a V-shaped or U-shaped segment, and the other end is used to connect with the adjacent hairpin 5 by twisting and outward welding, i.e., a welding end.

[0061] The stator core 6 is formed by stacking multiple silicon steel sheets, including a yoke, stator teeth, and stator tooth heads. Multiple stator slots 7 are formed on the inner circumference of the stator core 6, and multiple insulating papers 8 are respectively disposed inside the multiple stator slots 7. Multiple straight segments of hairpins 6 are respectively disposed inside the multiple stator slots 7 and interconnected to form multiple loops, forming a 2n-layer structure inside the corresponding stator slot 7, where n is a positive integer. Multiple lead-out wires 4 are respectively disposed on the straight segments of hairpins 5 at the beginning and end of the loops. Multiple copper busbars 3 are respectively connected to the multiple lead-out wires 4 and are used to connect to three terminals 1. The neutral point copper busbar 2 is connected to the multiple lead-out wires 4.

[0062] When winding is required on the stator core 6, the straight segments of multiple first-type hairpins 9, multiple second-type hairpins 11, and multiple third-type hairpins 10 are placed inside the stator slots 7 in a specific order. Specifically, the first-type hairpin 9 has a span of six stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction; the second-type hairpin 11 has a span of seven stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction; and the third-type hairpin 10 has a span of eight stator slots 7 between two straight segments of the hairpin 5 along the circumferential direction. After installing the multiple first-type hairpins 9, multiple second-type hairpins 11, and multiple third-type hairpins 10 into the corresponding stator slots 7, the welding ends of the multiple hairpins 5 are twisted and expanded outward to form multiple circuits. Specifically, the multiple circuits constitute multiple branches of the three-phase circuit. Multiple lead wires 4 are respectively set at the beginning and end of multiple circuits, that is, the soldered ends of the hairpins 5 at the beginning of the circuit that are not connected to other hairpins 5, and the soldered ends of the hairpins 5 at the end of the circuit that are not connected to other hairpins 5. Multiple copper busbars 3 are respectively connected to the lead wires 4 in the three-phase circuit, and the multiple copper busbars 3 are respectively connected to three terminals 1 to form a three-phase circuit. The neutral point copper busbar 2 can electrically short-circuit multiple three-phase circuits.

[0063] Through the above technical solution, the short-pitch flat wire motor stator winding structure provided by the present invention connects multiple first-type hairpins 9, second-type hairpins 11 and third-type hairpins 10 in a certain order on two adjacent layers to form a short-pitch wiring method for multiple circuits. This winding structure can effectively avoid circulating current and reduce harmonic effects to improve the quality and reliability of the motor. On the other hand, it can also make the lead wires more concentrated, thereby reducing the volume of multiple connecting copper busbars 3 and neutral point copper busbars 2, thus reducing costs.

[0064] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solutions of the present invention, and these simple modifications all fall within the protection scope of the present invention. Furthermore, it should be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0065] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A stator winding structure for a short-pitch flat wire motor, characterized in that, include: Multiple hairpins (5), the hairpins (5) include a first type of hairpin (9), a second type of hairpin (11) and a third type of hairpin (10), the two straight segments of the multiple hairpins (5) are respectively set inside the multiple stator slots (7) and connected to each other to form multiple loops, and form a 2n-layer structure inside the corresponding stator slots (7), where n is a positive integer; Multiple lead wires (4) are respectively set on the straight segment of the hairpin (5) at the beginning of the circuit and on the straight segment of the hairpin (5) at the end of the circuit; Multiple copper busbars (3) are connected to multiple leads (4) respectively, and are used to connect to three terminals (1); A neutral point copper busbar (2) is connected to a plurality of the lead-out lines (4); Each phase winding includes Line 1 and Line 2, which are connected in series or in parallel. The stator slot (7) has 6 layers inside and the number of stator slots (7) includes 48 slots. The fifth and sixth layers of the first line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow direction is first type hairpin (9) - third type hairpin (10) - first type hairpin (9) - second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11). The lead wire (4) is set on the straight segment of the first first type hairpin (9) of the fifth and sixth layers of the first line. The first type of hairpin (9) has a span of six, the second type of hairpin (11) has a span of seven, and the third type of hairpin (10) has a span of eight.

2. The short-pitch flat wire motor stator winding structure according to claim 1, characterized in that, The third and fourth layers of the first line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow is first type hairpin (9) - third type hairpin (10) - first type hairpin (9) - second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11). The first first type hairpin (9) of the third and fourth layers of the first line is connected to the last second type hairpin (11) of the fifth and sixth layers of the first line.

3. The short-pitch flat wire motor stator winding structure according to claim 2, characterized in that, The first and second layers of the first line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow is first type hairpin (9) - third type hairpin (10) - first type hairpin (9) - second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11). The first first type hairpin (9) of the first and second layers of the first line is connected to the last second type hairpin (11) of the third and fourth layers of the first line. The lead wire (4) is set on the straight segment of the last second type hairpin (11) of the first and second layers of the first line.

4. The short-pitch flat wire motor stator winding structure according to claim 1, characterized in that, The first and second layers of the second line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow direction is second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11) - first type hairpin (9) - third type hairpin (10) - first type hairpin (9). The lead wire (4) is set on the straight segment of the first second type hairpin (11) of the first and second layers of the second line.

5. The short-pitch flat wire motor stator winding structure according to claim 4, characterized in that, The third and fourth layers of the second line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow is second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11) - first type hairpin (9) - third type hairpin (10) - first type hairpin (9). The first second type hairpin (11) of the third and fourth layers of the second line is connected to the last first type hairpin (9) of the first and second layers of the second line.

6. The short-pitch flat wire motor stator winding structure according to claim 5, characterized in that, The fifth and sixth layers of the second line include three first type hairpins (9), two second type hairpins (11) and three third type hairpins (10). The current flow is second type hairpin (11) - third type hairpin (10) - first type hairpin (9) - third type hairpin (10) - second type hairpin (11) - first type hairpin (9) - third type hairpin (10) - first type hairpin (9). The first second type hairpin (11) of the fifth and sixth layers of the second line is connected to the last first type hairpin (9) of the third and fourth layers of the second line. The lead wire (4) is set on the straight segment of the last first type hairpin (9) of the fifth and sixth layers of the second line.

7. A short-pitch flat wire motor stator, characterized in that, include: The stator core (6) is made of multiple silicon steel sheets stacked together, and multiple stator slots (7) are provided on the inner circumference of the stator core (6). Multiple insulating sheets (8) are respectively disposed inside multiple stator slots (7); The winding structure as described in any one of claims 1-6.

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