72-slot 8-pole 8-layer 4-parallel branch flat wire motor stator winding and motor

Abstract

The invention discloses a 72-slot 8-pole 8-layer 4-parallel branch flat wire motor stator winding, which is obtained by winding a three-phase parallel flat wire through 8 layers and 72 slot positions in cooperation with a Hair-pin structure. The three phases comprise a U phase, a V phase and a W phase, and the U-phase winding, the V-phase winding and the W-phase winding are all formed by winding four-branch flat copper wires in cooperation with Hair-pins and I-pins and winding eight layers and 72 slot positions in a mode that three-phase parallel flat wires are matched with the Hair-pins; the three phases comprise a U phase, a V phase and a W phase, and the U-phase winding, the V-phase winding and the W-phase winding are formed by winding four-branch flat copper wires matched with Hair-pins and I-pins. The innermost layer of the winding adopts two coils with overlines on the same layer, due to different spans, the inner ring is expanded inwards by one layer structurally, and the height of the coils can be very low. In addition, the outermost layer of the winding is provided with a same-layer overline coil (hair pin) and also provided with an I-pin coil, so that the interference of the same-layer structure is effectively avoided.

Description

Technical Field

[0001] The invention relates to a stator winding, more specifically, to a stator winding of a flat-wire motor with 72 slots, 8 poles, 8 layers and 4 parallel branches. Background Art

[0002] At present, electrification is becoming more and more popular in the commercial vehicle market, especially in the field of heavy trucks. The sales of new energy vehicles are growing day by day. Whether it is a hybrid model or a pure electric model, the current drive scheme generally adopts permanent magnet synchronous motors. Except for the passenger car market, the current motor stators generally use copper round wire windings, and the slot fill rate is not high. However, the current demand for high-speed, lightweight, high-torque and high-efficiency heavy trucks has made the development of new flat wire motor stators that are suitable for the heavy truck market a top priority for technology research and development of major motor manufacturers. Summary of the invention

[0003] Based on this, it is necessary to provide a 72-slot, 8-pole, 8-layer, 4-parallel-branch flat wire motor stator winding to address the above technical problems.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions: A 72-slot 8-pole 8-layer 4-parallel branch flat wire motor stator winding, characterized in that the 72-slot 8-pole 8-layer 4-parallel branch flat wire motor stator winding is obtained by winding three-phase parallel flat wire with a Hair-pin structure through 8 layers and 72 slots; The three phases are U phase, V phase and W phase, and the U phase winding, V phase winding and W phase winding are all formed by winding four-branch flat copper wire in conjunction with Hair-pin and I-pin; Among them, in the U-phase winding, the first branch is formed by winding a flat wire from the first starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the first winding method; the second branch is formed by winding a flat wire from the 19th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the second winding method; the third branch is formed by winding a flat wire from the 37th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the third winding method; the fourth branch is formed by winding a flat wire from the 55th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the fourth winding method; The V-phase winding is obtained by rotating 6 slots relative to the U-phase winding in the direction of increasing slots; the W-phase winding is obtained by rotating 12 slots relative to the U-phase winding in the direction of increasing slots; The first winding method includes: the flat wire starts from the first starting point located at the first layer, firstly staggers every 2 layers along the circumferential direction to the 8th layer, then staggers the same layer along the circumferential direction to the reverse direction to the 1st layer, and repeats until it goes out of the 10th starting point of the 1st layer, wherein, starting from the 1st point, the span is halved, and every two points are regarded as a pair, and the welding ends are connected in sequence, the 1st layer and the 2nd layer are a pair of welding, the 3rd layer and the 4th layer are a pair of welding, the 5th layer and the 6th layer are a pair of welding, and the 7th layer and the 8th layer are a pair of welding, and the current flows as follows: 1st layer - 2nd layer, 3rd layer - 4th layer, 5th layer - 6th layer, 7th layer - Layer 8; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; The second winding method includes: the flat wire starts from the 19th starting point on the first layer, and each point is staggered in the same direction as the corresponding point on the first branch, and the connection method of the hair-pin in the second branch is the same as that in the first branch; The third winding method includes: the flat wire starts from the 37th starting point located on the first layer, and each point is staggered in the same direction as the points on the first branch and the second branch, and the connection method of the hair-pin in the third branch is the same as that in the first branch; The fourth winding method includes: the flat wire starts from the 55th starting point located on the first layer, and each point is staggered in the same direction as the points on the first branch, the second branch, and the third branch, and the fourth branch is connected in the same way as the Hair-pin in the first branch; Among them, when a three-phase parallel four-branch flat wire is used with a hairpin to pass through 8 layers and 72 slots, the number of poles is 8, the number of branches is 4, the main span is 9, and the potential angle is 20°; C1-C8 is defined as the number of layers of the stator, the outermost layer is 1, the innermost layer is 8, and 1-72 is the number of slots of the stator. In the first branch of the U-phase winding, the flat wire from U+ to U- with a hairpin connection route is: 1A+_C1-1→2A_C2-10→3A_C3 -19→4A_C4-28→5A_C5-37→6A_C6-46→7A_C7-55→8A_C8-64→9A_C8-3→10A_C7-66→11A_C6- 57→12A_C5-48→13A_C4-39→14A_C3-30→15A_C2-21→16A_C1-12→17A_C1-3→18A_C2-12→19 A_C3-21→20A_C4-30→21A_C5-39→22A_C6-48→23A_C7-57→24A_C8-66→25A_C8-2→26A_C7 -65→27A_C6-56→28A_C5-47→29A_C4-38→30A_C3-29→31A_C2-20→32A_C1-11→33A_C1-2→3 4A_C2-11→35A_C3-20→36A_C4-29→37A_C5-38→38A_C6-47→39A_C7-56→40A_C8-65→41A_C 8-1→42A_C7-64→43A_C6-55→44A_C5-46→45A_C4-37→46A_C3-28→47A_C2-19→48A_C1-10; In the second branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1B+_C1-19→2B_C2-28→3B_C3-37→4B_C4-46→5B_C5-55→6B_C6-64→7B_C7-1→8B_C8-10→9B_C8-21→10B_C7-12→11B_C6-3→12B_C5-66→13B_C4-57→14B_C3-48→15B_C2-39→16B_C1-30→17B_C1-21→18B_C2-30→19B_C3-39→20B_C4-48→21B_C5-57→22B_C6-66→23B_C7- 3→24B_C8-12→25B_C8-20→26B_C7-11→27B_C6-2→28B_C5-65→29B_C4-56→3 0B_C3-47→31B_C2-38→32B_C1-29→33B_C1-20→34B_C2-29→35B_C3-38→36B _C4-47→37B_C5-56→38B_C6-65→39B_C7-2→40B_C8-11→41B_C8-19→42B_C7 -10→43B_C6-1→44B_C5-64→45B_C4-55→46B_C3-46→47B_C2-37→48B_C1-28; The flat wire hairpin connection route from U+ to U- in the third branch of the U-phase winding is: 1C+_C1-37→2C_C2-46→3C_C3-55→4C_C4-64→5C_C5-1→6C_C6-10→7C_C7-19→8C_C8-28→9C_C8-39→10C_C7-30→11C_C6-21→12C_C5-12→13C_C4-3→14C_C3-66→15C_C2-57→16C_C1-48→17C_C1-39→18C_C2-48→19C_C3-57→20C_C4-66→21C_C5-3→22C_C6-12→23C_C7-2 1→24C_C8-30→25C_C8-38→26C_C7-29→27C_C6-20→28C_C5-11→29C_C4-2→3 0C_C3-65→31C_C2-56→32C_C1-47→33C_C1-38→34C_C2-47→35C_C3-56→36C _C4-65→37C_C5-2→38C_C6-11→39C_C7-20→40C_C8-29→41C_C8-37→42C_C7 -28→43C_C6-19→44C_C5-10→45C_C4-1→46C_C3-64→47C_C2-55→48C_C1-46; In the fourth branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1D+_C1-55→2D_C2-64→3D_C3-1→4D_C4-10→5D_C5-19→6D_C6-28→7D_C7-37→8D_C8-46→9D_C8-57→10D_C7-48→11D_C6-39→12D_C5-30→13D_C4-21→14D_C3-12→15D_C2-3→16D_C1-66→17D_C1-57→18D_C2-66→19D_C3-3→20D_C4-12→21D_C5-21→22D_C6-30→23D_C7-3 9→24D_C8-48→25D_C8-56→26D_C7-47→27D_C6-38→28D_C5-29→29D_C4-20→ 30D_C3-11→31D_C2-2→32D_C1-65→33D_C1-56→34D_C2-65→35D_C3-2→36D_ C4-11→37D_C5-20→38D_C6-29→39D_C7-38→40D_C8-47→41D_C8-55→42D_C7 -46→43D_C6-37→44D_C5-28→45D_C4-10→46D_C3-10→47D_C2-1→48D_C1-64.

[0005] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a 72-slot, 8-pole, 8-layer, 4-parallel-branch flat-wire motor stator winding, which has the following advantages: 1. The innermost layer of the winding uses two coils with the same layer of cross-wires. Due to the different spans, the inner coil is expanded one layer inward in structure, and the coil height can be made very low; 2. The outermost layer of the winding has both the same-layer cross-wire coil (hair pin) and the I-pin coil, which effectively avoids interference with the same-layer structure; 3. Looking at the design of the innermost and outermost layers, one layer is artificially expanded outward to avoid interference between the wires on the same layer. The overall structure is compact and will not interfere with the rotor. It can also control the insulation gap between the flat wires. 4. Compared with the existing copper round wire winding, this winding has a higher slot fill rate and can provide greater power and torque. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] To more clearly illustrate the solutions in the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0007] Figure 1 It is the winding schematic diagram of the four branches of the U-phase of the stator winding of the 72-slot 8-pole 8-layer 4-parallel-branch flat wire motor of the present invention; Figure 2 It is the winding schematic diagram of the four branches of the V-phase of the stator winding of the 72-slot 8-pole 8-layer 4-parallel-branch flat wire motor of the present invention; Figure 3 It is the winding schematic diagram of the four branches of the W-phase of the stator winding of the 72-slot 8-pole 8-layer 4-parallel-branch flat wire motor of the present invention. Specific embodiments

[0008] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention.

[0009] The stator winding of the 72-slot 8-pole 8-layer 4-parallel-branch flat wire motor is obtained by threading three-phase parallel flat wires with the Hair-pin structure through 8 layers and 72 slots.

[0010] The three phases are the U-phase, V-phase, and W-phase. The U-phase winding, V-phase winding, and W-phase winding are all formed by winding four-branch flat copper wires with the Hair-pin and I-pin.

[0011] It should be noted that both the Hair-pin structure and the I-pin structure belong to the winding forms of the flat wire motor. The Hair-pin structure is similar to a hairpin, and the I-pin structure is similar to the character "one".

[0012] Among them, in the U-phase winding, the first branch is formed by threading the flat wire starting from the 1st starting point on the 1st layer with the Hair-pin according to the first winding method through 8 layers and 72 slots; the second branch is formed by threading the flat wire starting from the 19th starting point on the 1st layer with the Hair-pin according to the second winding method through 8 layers and 72 slots; the third branch is formed by threading the flat wire starting from the 37th starting point on the 1st layer with the Hair-pin according to the third winding method through 8 layers and 72 slots; the fourth branch is formed by threading the flat wire starting from the 55th starting point on the 1st layer with the Hair-pin according to the fourth winding method through 8 layers and 72 slots.

[0013] The V-phase winding is obtained by rotating 6 slots relative to the U-phase winding in a direction of increasing slots; and the W-phase winding is obtained by rotating 12 slots relative to the U-phase winding in a direction of increasing slots.

[0014] The first winding method includes: the flat wire starts from the first starting point located at the first layer, firstly staggers every 2 layers along the circumferential direction to the 8th layer, then staggers in the same layer along the circumferential direction to the reverse direction to the 1st layer, and repeats until it goes out of the 10th starting point of the 1st layer, wherein, starting from the 1st point, the span is halved, and every two points are regarded as a pair, and the welding ends are connected in sequence, the 1st layer and the 2nd layer are a pair of welding, the 3rd layer and the 4th layer are a pair of welding, the 5th layer and the 6th layer are a pair of welding, and the 7th layer and the 8th layer are a pair of welding, and the current flows as follows: 1st layer-2nd layer, 3rd layer-4th layer, 5th layer-6th layer, 7th layer-8th layer 8 layers; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; The second winding method includes: the flat wire starts from the 19th starting point on the first layer, and each point is staggered and arranged in the same direction as the corresponding point on the first branch, and the connection method of the Hair-pin in the second branch is the same as that in the first branch.

[0015] The third winding method includes: the flat wire starts from the 37th starting point on the first layer, and each point is staggered in the same direction as the points on the first branch and the second branch, and the connection method of the hair-pin in the third branch is the same as that in the first branch.

[0016] The fourth winding method includes: the flat wire starts from the 55th starting point located on the first layer, and each point is staggered in the same direction as the points on the first branch, the second branch and the third branch, and the fourth branch is connected in the same way as the Hair-pin in the first branch.

[0017] Among them, when a three-phase parallel four-branch flat wire is used with a hairpin to pass through 8 layers and 72 slots, the number of poles is 8, the number of branches is 4, the main span is 9, and the potential angle is 20°; C1-C8 is defined as the number of layers of the stator, the outermost layer is 1, the innermost layer is 8, and 1-72 is the number of slots of the stator. In the first branch of the U-phase winding, the flat wire from U+ to U- with a hairpin connection route is: 1A+_C1-1→2A_C2-10→3A_C3- 19→4A_C4-28→5A_C5-37→6A_C6-46→7A_C7-55→8A_C8-64→9A_C8-3→10A_C7-66→11A_C6- 57→12A_C5-48→13A_C4-39→14A_C3-30→15A_C2-21→16A_C1-12→17A_C1-3→18A_C2-12→19 A_C3-21→20A_C4-30→21A_C5-39→22A_C6-48→23A_C7-57→24A_C8-66→25A_C8-2→26A_C7 -65→27A_C6-56→28A_C5-47→29A_C4-38→30A_C3-29→31A_C2-20→32A_C1-11→33A_C1-2→3 4A_C2-11→35A_C3-20→36A_C4-29→37A_C5-38→38A_C6-47→39A_C7-56→40A_C8-65→41A_C 8-1→42A_C7-64→43A_C6-55→44A_C5-46→45A_C4-37→46A_C3-28→47A_C2-19→48A_C1-10.

[0018] In the second branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1B+_C1-19→2B_C2-28→3B_C3-37→4B_C4-46→5B_C5-55→6B_C6-64→7B_C7-1→8B_C8-10→9B_C8-21→10B_C7-12→11B_C6-3→12B_C5-66→13B_C4-57→14B_C3-48→15B_C2-39→16B_C1-30→17B_C1-21→18B_C2-30→19B_C3-39→20B_C4-48→21B_C5-57→22B_C6-66→23B_C7-3 →24B_C8-12→25B_C8-20→26B_C7-11→27B_C6-2→28B_C5-65→29B_C4-56→30 B_C3-47→31B_C2-38→32B_C1-29→33B_C1-20→34B_C2-29→35B_C3-38→36B_ C4-47→37B_C5-56→38B_C6-65→39B_C7-2→40B_C8-11→41B_C8-19→42B_C7- 10→43B_C6-1→44B_C5-64→45B_C4-55→46B_C3-46→47B_C2-37→48B_C1-28.

[0019] In the third branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1C+_C1-37→2C_C2-46→3C_C3-55→4C_C4-64→5C_C5-1→6C_C6-10→7C_C7-19→8C_C8-28→9C_C8-39→10C_C7-30→11C_C6-21→12C_C5-12→13C_C4-3→14C_C3-66→15C_C2-57→16C_C1-48→17C_C1-39→18C_C2-48→19C_C3-57→20C_C4-66→21C_C5-3→22C_C6-12→23C_C7-21 →24C_C8-30→25C_C8-38→26C_C7-29→27C_C6-20→28C_C5-11→29C_C4-2→30 C_C3-65→31C_C2-56→32C_C1-47→33C_C1-38→34C_C2-47→35C_C3-56→36C_ C4-65→37C_C5-2→38C_C6-11→39C_C7-20→40C_C8-29→41C_C8-37→42C_C7- 28→43C_C6-19→44C_C5-10→45C_C4-1→46C_C3-64→47C_C2-55→48C_C1-46.

[0020] In the fourth branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1D+_C1-55→2D_C2-64→3D_C3-1→4D_C4-10→5D_C5-19→6D_C6-28→7D_C7-37→8D_C8-46→9D_C8-57→10D_C7-48→11D_C6-39→12D_C5-30→13D_C4-21→14D_C3-12→15D_C2-3→16D_C1-66→17D_C1-57→18D_C2-66→19D_C3-3→20D_C4-12→21D_C5-21→22D_C6-30→23D_C7-39 →24D_C8-48→25D_C8-56→26D_C7-47→27D_C6-38→28D_C5-29→29D_C4-20→3 0D_C3-11→31D_C2-2→32D_C1-65→33D_C1-56→34D_C2-65→35D_C3-2→36D_C 4-11→37D_C5-20→38D_C6-29→39D_C7-38→40D_C8-47→41D_C8-55→42D_C7- 46→43D_C6-37→44D_C5-28→45D_C4-10→46D_C3-10→47D_C2-1→48D_C1-64.

[0021] The stator winding has the following advantages: 1. The innermost layer of the winding uses two coils with the same layer of cross-wires. Due to the different spans, the inner coil is expanded one layer inward in structure, and the coil height can be made very low; 2. The outermost layer of the winding has both the same-layer cross-wire coil (hair pin) and the I-pin coil, which effectively avoids interference with the same-layer structure; 3. Looking at the design of the innermost and outermost layers, one layer is artificially expanded outward to avoid interference between the wires on the same layer. The overall structure is compact and will not interfere with the rotor. It can also control the insulation gap between the flat wires. 4. Compared with the existing copper round wire winding, this winding has a higher slot fill rate and can provide greater power and torque.

[0022] Obviously, the embodiments described above are only part of the embodiments of the present application, rather than all the embodiments. The drawings provide preferred embodiments of the present application, but do not limit the patent scope of the present application.

Claims

1. A 72-slot, 8-pole, 8-layer, 4-parallel-branch flat-wire motor stator winding, characterized in that: The stator winding of the 72-slot, 8-pole, 8-layer, 4-parallel-branch flat wire motor is obtained by winding three-phase parallel flat wires with a Hair-pin structure through 8 layers and 72 slots; The three phases are U phase, V phase and W phase, and the U phase winding, V phase winding and W phase winding are all formed by winding four-branch flat copper wire in conjunction with Hair-pin and I-pin; Among them, in the U-phase winding, the first branch is formed by winding a flat wire from the first starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the first winding method; the second branch is formed by winding a flat wire from the 19th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the second winding method; the third branch is formed by winding a flat wire from the 37th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the third winding method; the fourth branch is formed by winding a flat wire from the 55th starting point located at the first layer in cooperation with the Hair-pin through 8 layers and 72 slots according to the fourth winding method; The V-phase winding is obtained by rotating 6 slots relative to the U-phase winding in the direction of increasing slots; the W-phase winding is obtained by rotating 12 slots relative to the U-phase winding in the direction of increasing slots; The first winding method includes: the flat wire starts from the first starting point located at the first layer, firstly staggers every 2 layers along the circumferential direction to the 8th layer, then staggers the same layer along the circumferential direction to the reverse direction to the 1st layer, and repeats until it goes out of the 10th starting point of the 1st layer, wherein, starting from the 1st point, the span is halved, and every two points are regarded as a pair, and the welding ends are connected in sequence, the 1st layer and the 2nd layer are a pair of welding, the 3rd layer and the 4th layer are a pair of welding, the 5th layer and the 6th layer are a pair of welding, and the 7th layer and the 8th layer are a pair of welding, and the current flows as follows: 1st layer - 2nd layer, 3rd layer - 4th layer, 5th layer - 6th layer, 7th layer - Layer 8; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; after the 1st layer is reversed, the 1st layer - the 2nd layer, the 3rd layer - the 4th layer, the 5th layer - the 6th layer, the 7th layer - the 8th layer; after the 8th layer is reversed, the 8th layer - the 7th layer, the 6th layer - the 5th layer, the 4th layer - the 3rd layer, the 2nd layer - the 1st layer; The second winding method includes: the flat wire starts from the 19th starting point on the first layer, and each point is staggered in the same direction as the corresponding point on the first branch, and the connection method of the hair-pin in the second branch is the same as that in the first branch; The third winding method includes: the flat wire starts from the 37th starting point located on the first layer, and each point is staggered in the same direction as the points on the first branch and the second branch, and the connection method of the hair-pin in the third branch is the same as that in the first branch; The fourth winding method includes: the flat wire starts from the 55th starting point located on the first layer, and each point is staggered in the same direction as the points on the first branch, the second branch, and the third branch, and the fourth branch is connected in the same way as the Hair-pin in the first branch; Among them, when a three-phase parallel four-branch flat wire is used with a hairpin to pass through 8 layers and 72 slots, the number of poles is 8, the number of branches is 4, the main span is 9, and the potential angle is 20°; C1-C8 is defined as the number of layers of the stator, the outermost layer is 1, the innermost layer is 8, and 1-72 is the number of slots of the stator. In the first branch of the U-phase winding, the flat wire from U+ to U- with a hairpin connection route is: 1A+_C1-1→2A_C2-10→3A_C3 -19→4A_C4-28→5A_C5-37→6A_C6-46→7A_C7-55→8A_C8-64→9A_C8-3→10A_C7-66→11A_C6- 57→12A_C5-48→13A_C4-39→14A_C3-30→15A_C2-21→16A_C1-12→17A_C1-3→18A_C2-12→19 A_C3-21→20A_C4-30→21A_C5-39→22A_C6-48→23A_C7-57→24A_C8-66→25A_C8-2→26A_C7 -65→27A_C6-56→28A_C5-47→29A_C4-38→30A_C3-29→31A_C2-20→32A_C1-11→33A_C1-2→3 4A_C2-11→35A_C3-20→36A_C4-29→37A_C5-38→38A_C6-47→39A_C7-56→40A_C8-65→41A_C 8-1→42A_C7-64→43A_C6-55→44A_C5-46→45A_C4-37→46A_C3-28→47A_C2-19→48A_C1-10; In the second branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1B+_C1-19→2B_C2-28→3B_C3-37→4B_C4-46→5B_C5-55→6B_C6-64→7B_C7-1→8B_C8-10→9B_C8-21→10B_C7-12→11B_C6-3→12B_C5-66→13B_C4-57→14B_C3-48→15B_C2-39→16B_C1-30→17B_C1-21→18B_C2-30→19B_C3-39→20B_C4-48→21B_C5-57→22B_C6-66→23B_C7- 3→24B_C8-12→25B_C8-20→26B_C7-11→27B_C6-2→28B_C5-65→29B_C4-56→3 0B_C3-47→31B_C2-38→32B_C1-29→33B_C1-20→34B_C2-29→35B_C3-38→36B _C4-47→37B_C5-56→38B_C6-65→39B_C7-2→40B_C8-11→41B_C8-19→42B_C7 -10→43B_C6-1→44B_C5-64→45B_C4-55→46B_C3-46→47B_C2-37→48B_C1-28; The flat wire hairpin connection route from U+ to U- in the third branch of the U-phase winding is: 1C+_C1-37→2C_C2-46→3C_C3-55→4C_C4-64→5C_C5-1→6C_C6-10→7C_C7-19→8C_C8-28→9C_C8-39→10C_C7-30→11C_C6-21→12C_C5-12→13C_C4-3→14C_C3-66→15C_C2-57→16C_C1-48→17C_C1-39→18C_C2-48→19C_C3-57→20C_C4-66→21C_C5-3→22C_C6-12→23C_C7-2 1→24C_C8-30→25C_C8-38→26C_C7-29→27C_C6-20→28C_C5-11→29C_C4-2→3 0C_C3-65→31C_C2-56→32C_C1-47→33C_C1-38→34C_C2-47→35C_C3-56→36C _C4-65→37C_C5-2→38C_C6-11→39C_C7-20→40C_C8-29→41C_C8-37→42C_C7 -28→43C_C6-19→44C_C5-10→45C_C4-1→46C_C3-64→47C_C2-55→48C_C1-46; In the fourth branch of the U-phase winding, the flat wire from U+ to U- with the hairpin connection route is: 1D+_C1-55→2D_C2-64→3D_C3-1→4D_C4-10→5D_C5-19→6D_C6-28→7D_C7-37→8D_C8-46→9D_C8-57→10D_C7-48→11D_C6-39→12D_C5-30→13D_C4-21→14D_C3-12→15D_C2-3→16D_C1-66→17D_C1-57→18D_C2-66→19D_C3-3→20D_C4-12→21D_C5-21→22D_C6-30→23D_C7-3 9→24D_C8-48→25D_C8-56→26D_C7-47→27D_C6-38→28D_C5-29→29D_C4-20→ 30D_C3-11→31D_C2-2→32D_C1-65→33D_C1-56→34D_C2-65→35D_C3-2→36D_ C4-11→37D_C5-20→38D_C6-29→39D_C7-38→40D_C8-47→41D_C8-55→42D_C7 -46→43D_C6-37→44D_C5-28→45D_C4-10→46D_C3-10→47D_C2-1→48D_C1-64.

2. A motor, characterized in that: The motor comprises the 72-slot, 8-pole, 8-layer, 4-parallel-branch flat wire motor stator winding as described in claim 1.

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