72-slot 6-pole hairpin type flat wire armature winding and motor

Abstract

The invention provides a 72-slot 6-pole hairpin type flat wire armature winding and a motor. The winding is obtained by adopting a U-phase, V-phase and W-phase three-phase parallel flat wire to be matched with a hairpin to penetrate and wind an annular stator with n layers of 72 stator slot positions on the inner side, the U-phase winding comprises two branches which are connected in parallel, the first branch and the second branch are respectively matched with the hairpin from the first starting point and the second starting point which are positioned on the nth layer to sequentially wind to the first layer in a circumferential spiral reciprocating manner along the n-1 direction from the flat wire, and then wind to the nth layer in a circumferential spiral reciprocating manner along the n + 1 direction from the first layer in a reverse direction, an annular loop is constructed and formed at a first end point and a second end point of the nth layer after reciprocating bypassing between the nth layer and the first layer; and the V-phase winding and the W-phase winding are obtained by rotating 8 slots and 16 slots in the slot increasing direction relative to the U-phase winding respectively. The winding facilitates improvement of the slot fullness rate of the motor, generates higher magnetic field intensity, improves the power of the motor, is balanced in potential of each branch, and does not have the problem of circulating current.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a 72-slot 6-pole hairpin flat wire armature winding and a motor. Background Art

[0002] Compared with traditional round wire motors, flat wire motors have higher slot fill rate and power density. This is because flat wire motors use flat rectangular wires instead of round wires, so that the stator wire slots of the same area can accommodate more wires. This design not only improves the current conduction efficiency and reduces resistance loss, but also enhances the magnetic field strength, thereby increasing the power of the motor and vehicle power.

[0003] Flat wire motors have been widely used in new energy vehicle drive systems because they can significantly improve the slot fill rate and motor efficiency of the motor. However, the traditional flat wire stator winding connection method has obvious limitations. Especially under high-speed operation, due to the influence of skin effect and proximity effect, the current distribution on the cross section of the flat copper wire becomes uneven, resulting in differences in the resistance of each winding. This unbalanced resistance further causes uneven distribution of current in each winding, resulting in large additional copper loss, which not only reduces the motor efficiency, but also weakens the continuous performance of the motor at high speed.

[0004] Among them, the skin effect and the proximity effect are the main reasons for the uneven distribution of current in the conductor at high speed. The skin effect causes the current to tend to flow on the surface of the conductor, while the proximity effect causes the current distribution in adjacent conductors to affect each other; these two effects work together to make the current distribution on the cross section of the flat copper wire non-uniform, which in turn causes resistance differences and current imbalance problems.

[0005] Therefore, although the flat wire motor has significant advantages in efficiency, power density and heat dissipation performance, the traditional winding connection method limits its performance at high speed. To solve this problem, the present invention proposes an innovative stator winding method, which can effectively achieve complete current balance in each parallel branch, thereby improving the efficiency and performance of the flat wire motor. Summary of the invention

[0006] Based on the above description, the present invention provides a 72-slot 6-pole hairpin flat wire armature winding and motor, which solves the technical problem that the current flowing through each winding of the existing flat wire stator winding is unbalanced, affecting the efficiency and performance of the motor.

[0007] The technical solution of the present invention to solve the above technical problems is as follows: In a first aspect, the present invention provides a 72-slot 6-pole hairpin flat wire armature winding, comprising: a U-phase, V-phase and W-phase three-phase parallel flat wire with hairpins wound around an annular stator having n layers of 72 stator slots on the inner side; The U-phase winding includes two parallel branches, the first branch and the second branch are respectively composed of a flat wire starting from the first starting point and the second starting point located at the nth layer, and are wound in a circular spiral in the direction of n-1 in cooperation with a hairpin to the first layer, and then are wound in a circular spiral in the reverse direction from the first layer in the direction of n+1 to the nth layer, and are wound in a circular spiral between the nth layer and the first layer to the first end point and the second end point located at the nth layer to form a ring loop; wherein n is an even number of layers; The hairpins in the first branch and the second branch are connected in the same manner, and every two points in each branch serve as a pair; The V-phase winding is obtained by rotating 8 slots relative to the U-phase winding in the direction of increasing slots; The W-phase winding is obtained by rotating 16 slots relative to the U-phase winding in the direction of increasing slots.

[0008] Based on the above technical solution, the present invention can also be improved as follows.

[0009] Furthermore, when a three-phase flat wire with two branches in parallel is used with a hairpin to pass through 6 layers and 72 slots, the number of poles is 6 and the number of branches is 2; xy is defined as the yth layer of the xth slot, where x∈[1,72], y∈[a,f], a is the 1st layer, located in the slot, and f is the 6th layer, located outside the slot; The first branch of the U-phase winding uses the 14f position as the initial inflow point of the current, and starts from the 14f position located at the 6th layer, and then goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in reverse order, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 27f located at the 6th layer, with 27f as the final outflow point of the current.

[0010] Furthermore, U1+ is defined as the initial inflow point of the first branch current on the U phase, U1- is defined as the final outflow point of the first branch current on the U phase, and the link route of the first branch of the U phase winding from U1+ to U1- is: 14f→25e→37f→50e→62f→1e→13f→26e→38f→49e→61f→2e→14d→25c→37d→50c→62d→1c→13d→26c→38d→49c→61d→2c→14b→25a→37b→50a→62b→1a→13b→26a→38b→49a→61b→2a→ 15a→4b→64a→51b→39a→28b→16a→3b→63a→52b→40a→27b→15c→4d→64c→51d→39c→28d→16c→3d→63c→52d→40c→27d→15e→4f→64d→51f→39e→28f→16e→3f→63d→52f→40e→27f.

[0011] Furthermore, the second branch of the U-phase winding takes the 15f position as the initial inflow point of the current, and starts from the 15f position located on the 6th layer, and then goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in reverse order, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 26f located on the 6th layer, with 26f as the final outflow point of the current.

[0012] Furthermore, U2+ is defined as the initial inflow point of the second branch current on the U phase, U2- is defined as the final outflow point of the second branch current on the U phase, and the link route of the second branch of the U phase winding from U2+ to U2- is: 15f→28e→40f→51e→63f→4e→16f→27e→39f→52e→64f→3e→15d→28c→40d→51c→63d→4c→16d→27c→39d→52c→64d→3c→15b→28a→40b→51a→63b→4a→16b→27a→39b→52a→64b→3a→ 14a→1b→61a→50b→38a→25b→13a→2b→62a→49b→37a→26b→14c→1d→61c→50d→38c→25d→13c→2d→62c→49d→37c→26d→14e→1f→61d→50f→38e→25f→13e→2f→62d→49f→37e→26f.

[0013] Furthermore, in the first branch and / or the second branch of the U-phase winding, current flows in from the left end of the first hairpin and flows out from the right end of the last hairpin.

[0014] Furthermore, from the first hairpin to the last hairpin, starting from the first hairpin, two adjacent points share a hairpin, and the adjacent ends of the two adjacent hairpins are welded together after twisting the paint stripping ends.

[0015] In a second aspect, the present invention further provides a motor, comprising: a rotor and a 72-slot 6-pole hairpin flat wire armature winding as described in any one of the first aspects; the rotor is rotatable relative to the 72-slot 6-pole hairpin flat wire armature winding.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: The 72-slot 6-pole hairpin-type flat wire armature winding provided by the present invention is obtained by using three-phase parallel flat wires of U phase, V phase and W phase to cooperate with hairpins to pass through an annular stator with n layers of 72 stator slots on the inner side; the U phase winding includes two parallel branches, the first branch and the second branch are respectively composed of flat wires starting from the first starting point and the second starting point located at the nth layer, and cooperating with hairpins to successively wind in a circular spiral in the direction of n-1 to the first layer, and then from the first layer, reversely wind in a circular spiral in the direction of n+1 to the nth layer, and at the first layer, the flat wires are wound back and forth in a circular spiral in the reverse direction. After reciprocating between the nth layer and the first layer, a circular loop is constructed at the first and second ends of the nth layer; wherein n is an even number of layers; the connection method of the hairpins in the first branch and the second branch is the same, and every two points in each branch are regarded as a pair; the V-phase winding is obtained by rotating 8 slots relative to the U-phase winding in the direction of increasing slots; the W-phase winding is obtained by rotating 16 slots relative to the U-phase winding in the direction of increasing slots, forming a 72-slot 6-pole hairpin flat wire armature winding, providing a new hairpin flat wire armature winding method.

[0017] Compared with the existing hairpin winding, the 72-slot 6-pole hairpin flat wire armature winding provided by the present invention optimizes the winding structure and connection method, which is beneficial to improving the motor slot full rate, so as to generate a higher magnetic field strength, improve the motor power, and achieve the potential balance of the current in each parallel branch; this not only eliminates the additional copper loss caused by current imbalance, but also improves the efficiency and continuous performance of the motor at high speed; and the winding structure is simple, the process manufacturing is good, and it is suitable for mass production, providing a theoretical basis for motor stator products.

[0018] Furthermore, the motor provided by the present invention includes the above-mentioned 72-slot 6-pole hairpin flat wire armature winding, so it at least has all the technical effects of the above-mentioned 72-slot 6-pole hairpin flat wire armature winding, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A distribution diagram of the conductors in the slots of a 72-slot 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention; Figure 2 A schematic diagram of a U-phase winding of a 72-slot, 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention; Figure 3 A schematic diagram of the U-phase first branch welding end winding of a 72-slot 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention; Figure 4 A schematic diagram of the U-phase second branch welding end winding of a 72-slot 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention; Figure 5 A schematic diagram of a V-phase winding of a 72-slot, 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention; Figure 6 A schematic diagram of a W-phase winding of a 72-slot, 6-pole hairpin flat wire armature winding provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0021] The following embodiments of the present invention are further described in detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention but cannot be used to limit the scope of the present invention.

[0022] In a first aspect, an embodiment of the present invention provides a 72-slot 6-pole hairpin flat wire armature winding, comprising: a three-phase parallel flat wire of U phase, V phase and W phase is wound with a hairpin through an annular stator having n layers of 72 stator slots on the inner side.

[0023] The U-phase winding includes two parallel branches, the first branch and the second branch are respectively composed of a flat wire starting from the first starting point and the second starting point located at the nth layer, and are wound back and forth in a circular spiral in the direction of n-1 in cooperation with hairpins to the first layer, and then are wound back and forth in a circular spiral in the reverse direction from the first layer in the direction of n+1 to the nth layer, and after winding back and forth between the nth layer and the first layer, a ring loop is constructed at the first end point and the second end point located at the nth layer; wherein n is an even number of layers.

[0024] The hairpins in the first branch and the second branch are connected in the same manner, and every two points in each branch serve as a pair.

[0025] The V-phase winding is obtained by rotating 8 slots relative to the U-phase winding in the direction of increasing slots.

[0026] The W-phase winding is obtained by rotating 16 slots relative to the U-phase winding in the direction of increasing slots.

[0027] like Figure 1 As shown, the winding provided by the embodiment of the present invention has 6 layers of slots. Taking the example of a three-phase flat wire with two parallel branches winding through 6 layers of 72 slots, the number of poles is 6, and xy is defined as the yth layer of the xth slot, wherein x∈[1,72], y∈[a,f], a~f are the 1-6 layer numbers of the conductor in the slot, a is a layer located in the slot, and f is a layer located outside the slot. For example: 1a refers to the ath layer of the 1st stator slot.

[0028] like Figures 2 to 6 As shown, the winding provided by the embodiment of the present invention has 6 layers of slots. Taking the example of a three-phase flat wire with two parallel branches winding through 6 layers of 72 slots, the number of poles is 6, and xy is defined as the yth layer of the xth slot, wherein x∈[1,72], y∈[a,f], a~f are the 1-6 layer numbers of the conductor in the slot, and a is a layer located in the slot, for example: 1a refers to the ath layer of the 1st stator slot.

[0029] In the table, 1~72 mark the order in which the current flows through the slot, where number 1 is the position where the branch current begins to flow in, i.e. U+, and number 64 is the position where the branch current finally flows out, i.e. U1+ is the initial inflow point of the first branch current on phase U, and U1- is the final outflow point of the first branch current on phase U.

[0030] Among them, AA is the first branch of U phase, AB is the second branch of U phase, AA1 and AB1 are the lead-out terminals of U phase line, and AA64 and AB64 are the lead-out terminals of neutral line.

[0031] It should be noted that the lead-out terminal and the neutral line terminal can be swapped, that is, AA1 and AB1 can be set as the neutral line lead-out terminal, and AA64 and AB64 can be set as the U-phase line lead-out terminal.

[0032] Figure 2 The figure shows the U-phase winding schematic diagram of a 6-layer, 72-slot, 6-pole hairpin flat wire armature winding. Figure 3 The figure shows the first branch of the U-phase winding, with the 14f position as the initial inflow point of the current. Starting from the 14f position located at the 6th layer, it goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then it goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in the reverse direction, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 27f located at the 6th layer, with 27f as the final outflow point of the current.

[0033] In the first branch of the U-phase winding, the current flows in from the left end of the first hairpin and flows out from the right end of the last hairpin. From the first hairpin to the last hairpin, starting from the first hairpin, two adjacent points share a hairpin, and the adjacent ends of the two adjacent hairpins are twisted and welded together through the paint stripping end.

[0034] The windings of the first branch and the second branch in the U phase in the specific embodiment are described as follows: The winding connection route of the first branch U+ to U- in phase U is as follows Figure 3 As shown in the figure (where the dotted line is the connection of the welding end), U1+ is defined as the initial inflow point of the first branch current on the U phase, and U1- is defined as the final outflow point of the first branch current on the U phase. The flat wire from U+ to U- in the first branch of the U phase winding is connected in the following way with the hairpin: 14f→25e→37f→50e→62f→1e→13f→26e→38f→49e→61f→2e→14d→25c→37d→50c→62d→1c→13d→26c→38d→49c→61d→2c→14b→25a→37b→50a→62b→1a→13b→26a→38b→49a→61b→2a→15a→4b→6 4a→51b→39a→28b→16a→3b→63a→52b→40a→27b→15c→4d→64c→51d→39c→28d→16c→3d→63c→52d→40c→27d→15e→4f→64d→51f→39e→28f→16e→3f→63d→52f→40e→27f; flows in from 14f and finally flows out from 27f.

[0035] Specifically, the current flows from the left end of the first hairpin, i.e., 14f, and the right end of the first hairpin (AA1 and AA2 are a hairpin, and the AA2 end is twisted to the right at the paint stripping end of the e layer slot 25) and the left end of the second hairpin (AA3 and AA4 arrows are a hairpin, i.e., the AA3 end is in the slot 37 of the f layer and is twisted to the left at the paint stripping end) are welded together after twisting the paint stripping end (i.e., AA2 and AA3 are connected by welding), and the right end of the second hairpin (AA4 is in the slot 50 of the e layer and the paint stripping end is twisted to the right Type) and the left end of the third hairpin (AA5 and AA6 are a hairpin, that is, the AA5 end is in slot 62 of layer f and the stripped paint end is twisted to the left) are also welded together after twisting the stripped paint end (that is, AA4 and AA5 are connected by welding). The winding current flows to fefe…e layer, dcdc…c layer, baba…a layer, abab…b layer, baba…a layer, cdcd…d layer, efef…f layer, and so on, and finally flows out from 27f (that is, U-).

[0036] The second branch of the U-phase winding takes the 15f position as the initial inflow point of the current, and starts from the 15f position located at the 6th layer, and then goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in the reverse direction, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 26f located at the 6th layer, with 26f as the final outflow point of the current.

[0037] The winding connection route of the first branch U+ to U- in phase U is as follows Figure 4 As shown in the figure (where the dotted line is the connection of the welding end), U2+ is defined as the initial inflow point of the second branch current on the U phase, and U2- is defined as the final outflow point of the second branch current on the U phase. The connection route of the second branch of the U phase winding from U2+ to U2- is: 15f→28e→40f→51e→63f→4e→16f→27e→39f→52e→64f→3e→15d→28c→40d→51c→63d→4c→16d→27c→39d→52c→64d→3c→15b→28a→40b→51a→63b→4a→16b→27a→39b→52a→64b→3a→ 14a→1b→61a→50b→38a→25b→13a→2b→62a→49b→37a→26b→14c→1d→61c→50d→38c→25d→13c→2d→62c→49d→37c→26d→14e→1f→61d→50f→38e→25f→13e→2f→62d→49f→37e→26f.

[0038] Specifically, the current flows from the left end of the first hairpin, i.e., 15f, and the right end of the first hairpin (AB1 and AB2 are a hairpin, and the AB2 end is twisted to the right at the paint stripping end of the e layer slot 28) and the left end of the second hairpin (the arrows AB3 and AB4 are a hairpin, i.e., the AB3 end is in the slot 40 of the f layer and is twisted to the left at the paint stripping end) are welded together after twisting the paint stripping end (i.e., AB2 and AB3 are connected by welding), and the right end of the second hairpin (AB4 is in the slot 51 of the e layer and the paint stripping end is twisted to the right Type) and the left end of the third hairpin (AB5 and AB6 are a hairpin, that is, the AB5 end is in slot 63 of layer f and the stripped paint end is twisted to the left) are also welded together after twisting the stripped paint end (that is, AB4 and AB5 are connected by welding). The winding current flows to fefe…e layer, dcdc…c layer, baba…a layer, abab…b layer, baba…a layer, cdcd…d layer, efef…f layer, and so on, and finally flows out from 26f (that is, U-).

[0039] The winding method of the V-phase winding is to rotate the U-phase winding by 8 slots in the direction of increasing slot number, such as Figure 4 As shown, the first branch flows into the f-th layer of slot No. 22 (22f), and finally flows out of the f-th layer of slot No. 35 (35f), and the second branch flows into the f-th layer of slot No. 23 (23f), and finally flows out of the f-th layer of slot No. 34 (34f). Those skilled in the art perform corresponding winding operations according to the above contents, and the detailed connection routes are not repeated here.

[0040] The winding method of the W phase winding is to rotate the U phase winding 16 slots in the direction of increasing slot number, such as Figure 5 As shown, the first branch flows into the f-th layer of slot No. 30 (30f), and finally flows out of the f-th layer of slot No. 19 (19f), and the second branch flows into the f-th layer of slot No. 31 (31f), and finally flows out of the f-th layer of slot No. 19 (19f). Those skilled in the art perform corresponding winding operations according to the above contents, and the detailed connection routes are not repeated here.

[0041] The embodiment adopted in the present invention is a 6-layer flat wire armature winding, but in the specific implementation process, the winding of 4, 6, 10, 12 or other even-numbered layers of flat wire armature winding can be achieved by deleting or increasing the number of layers of cross-wires. It can also be wound by moving the upper 4 layers or the lower 4 layers of windings to the left or right by a certain number of slots, or by moving the base layer or the even layer to the left or right by a certain number of slots. Therefore, the winding method adopted in the present invention and the hairpin coil compatible with the winding method are not limited to the winding of the 6-layer flat wire armature winding of this embodiment.

[0042] AA1 and AA64 can be connected into a ring loop from the layout position, so the two branch lead-out ends of the single-phase can be selected from any point on the loop. For example, the phase lead-out line of the first branch of the U phase can be AA28, and the neutral lead-out end is the corresponding welding end AA29. The other two branches can also arbitrarily select the phase lead-out end and the neutral lead-out end in the same direction, and the selected starting point numbers do not need to be consistent. The winding method of the other two phases can refer to the U phase to select the starting and ending points of the phase lead-out end and the neutral line.

[0043] This winding design has significant advantages in improving the motor slot full rate. It can more effectively utilize the space in the motor slot, thereby generating a stronger magnetic field strength. This enhancement not only directly improves the output power of the motor, but also ensures the high efficiency and stability of the motor during operation. More importantly, through careful design, the winding achieves a perfect balance of the potential of each branch, fundamentally eliminating the circulation phenomenon. This feature is of great significance for reducing energy consumption and extending the service life of the motor.

[0044] In addition, the design of the winding structure adheres to the principle of simplicity but not simplicity. Its structure is intuitive and easy to understand, which is not only convenient for installation and maintenance, but also greatly improves the process manufacturability. This design concept is very suitable for the needs of modern production lines and provides a solid guarantee for mass and efficient production. Therefore, this winding technology not only lays a solid theoretical foundation for the design and manufacture of motor stator products, but also promotes the innovation and progress of motor technology and opens up a new path to achieve comprehensive improvement of motor performance.

[0045] In a second aspect, an embodiment of the present invention further provides a motor, comprising: a rotor and a 72-slot 6-pole hairpin flat wire armature winding as described in any embodiment of the first aspect above; the rotor can rotate relative to the 72-slot 6-pole hairpin flat wire armature winding.

[0046] Since the motor adopts the 72-slot 6-pole hairpin flat wire armature winding described in the above embodiment, the specific structure of the 72-slot 6-pole hairpin flat wire armature winding refers to the above embodiment. Since the motor adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A 72-slot 6-pole hairpin flat wire armature winding, characterized in that: include: The method is obtained by using three-phase parallel flat wires of U phase, V phase and W phase in combination with hairpins to pass through a ring-shaped stator having n layers and 72 stator slots on the inner side; The U-phase winding includes two parallel branches, the first branch and the second branch are respectively composed of a flat wire starting from the first starting point and the second starting point located at the nth layer, and are wound in a circular spiral in the direction of n-1 in cooperation with a hairpin to the first layer, and then are wound in a circular spiral in the reverse direction from the first layer in the direction of n+1 to the nth layer, and are wound in a circular spiral between the nth layer and the first layer to the first end point and the second end point located at the nth layer to form a ring loop; wherein n is an even number of layers; The hairpins in the first branch and the second branch are connected in the same manner, and every two points in each branch serve as a pair; The V-phase winding is obtained by rotating 8 slots relative to the U-phase winding in the direction of increasing slots; The W-phase winding is obtained by rotating 16 slots relative to the U-phase winding in the direction of increasing slots.

2. The 72-slot 6-pole hairpin flat wire armature winding according to claim 1, characterized in that: When a three-phase flat wire with two branches in parallel is used with a hairpin to pass through 6 layers and 72 slots, the number of poles is 6 and the number of branches is 2; xy is defined as the yth layer of the xth slot, where x∈[1,72], y∈[a,f], a is the 1st layer, located in the slot, and f is the 6th layer, located outside the slot; The first branch of the U-phase winding uses the 14f position as the initial inflow point of the current, and starts from the 14f position located at the 6th layer, and then goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in reverse order, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 27f located at the 6th layer, with 27f as the final outflow point of the current.

3. The 72-slot 6-pole hairpin flat wire armature winding according to claim 2, characterized in that: Define U1+ as the initial inflow point of the first branch current on the U phase, and U1- as the final outflow point of the first branch current on the U phase. The link route of the first branch of the U phase winding from U1+ to U1- is: 14f→25e→37f→50e→62f→1e→13f→26e→38f→49e→61f→2e→14d→25c→37d→50c→62d→1c→13d→26c→38d→49c→61d→2c→14b→25a→37b→50a→62b→1a→13b→26a→38b→49a→61b→2a→ 15a→4b→64a→51b→39a→28b→16a→3b→63a→52b→40a→27b→15c→4d→64c→51d→39c→28d→16c→3d→63c→52d→40c→27d→15e→4f→64d→51f→39e→28f→16e→3f→63d→52f→40e→27f.

4. The 72-slot 6-pole hairpin flat wire armature winding according to claim 2, characterized in that: The second branch of the U-phase winding takes the 15f position as the initial inflow point of the current, and starts from the 15f position located at the 6th layer, and then goes back and forth in a circular spiral into the slot to the 5th layer, and then goes back and forth in a circular spiral from the 4th layer to the slot to the 3rd layer, and then goes back and forth in a circular spiral from the 2nd layer to the slot to the 1st layer; then goes back and forth in a circular spiral from the 1st layer to the outside of the slot to the 2nd layer in reverse order, and then goes back and forth in a circular spiral from the 3rd layer to the outside of the slot to the 4th layer, and then goes back and forth in a circular spiral from the 5th layer to the outside of the slot to the 6th layer, and after going back and forth between the 6th layer and the 1st layer, it arrives at 26f located at the 6th layer, with 26f as the final outflow point of the current.

5. The 72-slot 6-pole hairpin flat wire armature winding according to claim 4, characterized in that: Define U2+ as the initial inflow point of the second branch current on the U phase, and U2- as the final outflow point of the second branch current on the U phase. The link route of the second branch of the U phase winding from U2+ to U2- is: 15f→28e→40f→51e→63f→4e→16f→27e→39f→52e→64f→3e→15d→28c→40d→51c→63d→4c→16d→27c→39d→52c→64d→3c→15b→28a→40b→51a→63b→4a→16b→27a→39b→52a→64b→3a→ 14a→1b→61a→50b→38a→25b→13a→2b→62a→49b→37a→26b→14c→1d→61c→50d→38c→25d→13c→2d→62c→49d→37c→26d→14e→1f→61d→50f→38e→25f→13e→2f→62d→49f→37e→26f.

6. The 72-slot 6-pole hairpin flat wire armature winding according to any one of claims 2 to 5, characterized in that: In the first branch and / or the second branch of the U-phase winding, current flows in from the left end of the first hairpin and flows out from the right end of the last hairpin.

7. The 72-slot 6-pole hairpin flat wire armature winding according to claim 6, characterized in that: From the first hairpin to the last hairpin, starting from the first hairpin, two adjacent points share a hairpin, and the adjacent ends of the two adjacent hairpins are twisted and welded together through the paint stripping ends.

8. A motor, characterized in that: include: A rotor and a 72-slot 6-pole hairpin flat wire armature winding as claimed in any one of claims 1 to 7; the rotor is rotatable relative to the 72-slot 6-pole hairpin flat wire armature winding.

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