Flat wire continuous winding device and winding method thereof

Abstract

The application relates to a flat wire continuous winding device and a winding method thereof. The device comprises a winding, a non-outgoing wire side, an outgoing wire side and outgoing wires; the outgoing wire side is located above a stator; the non-outgoing wire side is located below the stator; the outgoing wires are led out from the outer layer of the outgoing wire side and comprise U-phase outgoing wires, V-phase outgoing wires, W-phase outgoing wires and outgoing wires of a neutral point; the winding has 2*K layers, is embedded into a stator with M slots per pole per phase and M parallel motor branches. The method adopts a flat wire winding form, can adopt a continuous wave winding process, all windings are continuously formed through a die, welding points and welding sides are cancelled, only three-phase outgoing wires and a neutral point need to be welded, all windings can be synchronously integrally formed, span adjustment times are less and are convenient, and finally, cylindrical winding is wound and expanded into a stator slot through equipment from the radial direction.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and more specifically to a flat wire continuous winding device and its winding method. Background Technology

[0002] In recent years, the new energy vehicle market has developed rapidly. The drive motors of new energy vehicles are mainly permanent magnet synchronous motors. Among them, flat wire stator permanent magnet synchronous motors have obvious advantages over round wire stator permanent magnet synchronous motors in terms of slot fill factor, end height, heat dissipation, NVH, and operating efficiency. Therefore, the market penetration of flat wire motors has shown a significant increasing trend.

[0003] With the increasing number of new energy vehicle models using flat-wire motors and the significant increase in the production volume of different models, the production efficiency and cost of flat-wire motors have become the core of their development. Currently, most domestically produced flat-wire motors use pin windings, requiring welding on one side of the winding to achieve the winding connection. This increases tooling costs and reduces the reliability of the motor stator.

[0004] For example, Chinese invention patent CN110768410A, "A Flat Wire Stator for a Permanent Magnet Synchronous Motor in Vehicles," provides a flat wire stator for a permanent magnet synchronous motor in vehicles, including a stator core and main coils. The stator core has 12n coil slots circumferentially, where n is a positive integer. Each coil slot is divided into 4k layers radially from the stator core, where k is a positive integer. Each pair of adjacent layers forms a coil slot group. The main coils are arranged in k main coil layers radially from the stator core. The k main coil layers correspond to k coil slot groups, and one end of the main coil is embedded in the outer layer of the coil slot group, while the other end is embedded in the inner layer of the coil slot group. The k main coil layers are concentrated in 9n consecutive coil slots. The stator core is provided with secondary coil layers for connecting the main coil layers in parallel and two sets of lead wires for connecting the main coil layers in parallel.

[0005] This invention improves the production efficiency of motor stators. Its coils are neat, with fewer irregularly shaped wires, and the leads are concentrated for easy connection. However, it has leads at the twisted ends. The main coil of this winding is a 6-span coil. After traversing the 12th layer, it enters the 34th layer through an irregularly shaped coil. After traversing the 34th layer, it enters the 56th layer through another irregularly shaped coil, and so on, until reaching the outermost layer. While the winding shape is neat, it does not consider the circumferential balance between branches, lacks any transposition, and results in different magnetic field environments between adjacent slots, leading to significant imbalances between different branches. It is a typical pin-winding principle scheme, with leads arranged in the innermost and outermost layers. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a flat wire continuous winding device, characterized in that it includes a winding 22, a non-lead side 23, a lead side 24, and lead wires 25; the lead side 24 is located above the stator 21; the non-lead side 23 is located below the stator 21; the lead wires 25 are led out from the outer layer of the lead side 24, including U-phase lead wires, V-phase lead wires, W-phase lead wires, and a neutral point lead wire; the winding 22 has 2*K layers and is embedded in the stator 21, which has M slots per pole per phase and M parallel motor branches.

[0007] Furthermore, M is greater than or equal to 2, K is greater than or equal to 2, and the number of poles N is greater than or equal to 4.

[0008] Furthermore, the number of the lead-out wires 25 is M*M*2.

[0009] Furthermore, the neutral point leads include U-phase neutral point leads, V-phase neutral point leads, and W-phase neutral point leads; connecting one U-phase neutral point lead, one V-phase neutral point lead, and one W-phase neutral point lead together forms a new neutral point.

[0010] Furthermore, the winding 22 is wound into a cylindrical shape and radially expanded into the stator slot provided on the stator 21 by a device.

[0011] The present invention also provides a winding method for the flat wire continuous winding device, wherein each phase of the winding method includes M parallel branches, each branch bypassing all slots of the phase and bypassing 1 to 2*K layers of the slots. The first and second layers of the stator slots from the outside to the inside are the first turn, the third and fourth layers are the second turn, ... the 2K-1 and 2K layers are the Kth turn, and so on.

[0012] During the winding process, the branch circuit on the non-lead wire side 23 constantly crosses 3*M-1 stator slots; during each winding, the branch circuit on the lead wire side 24 constantly crosses 3*M-1 stator slots; after the branch circuit completes the first winding, it crosses a winding to enter the next winding. On the lead wire side 24, if it is located in the outermost slot of the phase, it crosses 3*M+1 stator slots; if it is located in a non-outermost slot of the phase, it crosses 3*M-2 stator slots.

[0013] After the branch loops around all loops, it performs a same-layer winding on the outermost layer, and then reverses the winding direction. The reverse winding method is the same as the winding method of the branch loop during the winding process.

[0014] Furthermore, during the winding process, the branch path makes a clockwise loop around all the loops.

[0015] Furthermore, a continuous wave winding process is used during winding, and all windings are formed continuously by mold.

[0016] The present invention also provides a motor stator, characterized in that the motor stator includes the aforementioned flat wire continuous winding device.

[0017] The present invention also provides an electric motor, characterized in that the electric motor includes the aforementioned motor stator.

[0018] The beneficial effects of this invention are as follows:

[0019] The flat wire continuous winding device and method involved in this invention firstly adopts a flat wire winding form, which can be carried out by continuous wave winding process. All windings are continuously formed by mold, eliminating solder joints and welding sides. Only the three-phase leads and neutral point need to be welded.

[0020] Secondly, this winding principle ensures that all leads are located on the outermost layer of the stator, facilitating full utilization of the stator core yoke space during welding and shortening the axial dimension.

[0021] Furthermore, the welding side wires of this winding principle are completely consistent, regular and neat with low end height, and each branch crosses all slots and layers of the phase, minimizing circulating current.

[0022] In terms of process, this solution can simultaneously form all windings into one piece, with fewer and more convenient span adjustments. Finally, the windings are wound into cylindrical shapes and then radially expanded into the stator slots using equipment. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the stator;

[0024] Figure 2 This is a schematic diagram showing the number of layers and turns in the slot of a flat wire continuous winding.

[0025] Figure 3 A partial schematic diagram of the lead wires of a flat wire continuous winding;

[0026] Figure 4 A schematic diagram showing the winding principle of the first branch U1 of phase U;

[0027] Figure 5 A schematic diagram illustrating the winding principle of the second branch U2 of phase U;

[0028] Figure 6 This is a schematic diagram illustrating the winding principle of the third branch U3 of phase U. Detailed Implementation

[0029] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This invention provides a flat wire continuous winding device, such as... Figure 1 As shown, the stator includes winding 22, non-lead side 23, lead side 24, and lead wire 25. Lead side 24 is located above stator 21; non-lead side 23 is located below stator 21; lead wire 25 is led out from the outer layer of lead side 24, including U-phase lead wire, V-phase lead wire, W-phase lead wire, and neutral point lead wire; winding 22 has 2*K layers and is embedded in stator 21 with M slots per pole per phase and M parallel motor branches.

[0031] M is greater than or equal to 2, K is greater than or equal to 2, and the number of poles N is greater than or equal to 4; the number of leads 25 is M*M*2.

[0032] The neutral point leads include leads for the U-phase neutral point, the V-phase neutral point, and the W-phase neutral point; connecting one U-phase neutral point lead, one V-phase neutral point lead, and one W-phase neutral point lead together forms a new neutral point. The winding 22 is wound into a cylindrical shape and radially expanded into the stator slots provided on the stator 21 by a device.

[0033] The present invention also provides a winding method for the flat wire continuous winding device, wherein each phase of the winding method includes M parallel branches, each branch bypassing all slots of the phase and bypassing 1 to 2*K layers of the slots. The first and second layers of the stator slots from the outside to the inside are the first turns, the third and fourth layers are the second turns, ... the 2K-1 and 2K layers are the Kth turns, and so on.

[0034] During the winding process, the branch circuit on the non-lead wire side 23 constantly crosses 3*M-1 stator slots; during each turn of winding, the branch circuit on the lead wire side 24 constantly crosses 3*M-1 stator slots; after the branch circuit completes the first turn, it crosses another turn to enter the next turn. On the lead wire side 24, if it is located in the outermost slot of the phase, it crosses 3*M+1 stator slots; if it is located in a non-outermost slot of the phase, it crosses 3*M-2 stator slots; during the winding process, the branch circuit completes all turns clockwise.

[0035] After the branch circuit completes all loops, it is wound in the same layer on the outermost layer, and then wound in the reverse direction. The method of reversing the winding is the same as the winding method of the branch circuit during the winding process. Furthermore, a continuous wave winding process is used for the winding, and all windings are formed continuously by a mold.

[0036] As a general technical concept, the present invention also provides a motor stator, wherein the motor stator adopts the aforementioned flat wire continuous winding device.

[0037] As a general technical concept, the present invention also provides an electric motor employing a motor stator with the aforementioned flat wire continuous winding.

[0038] The stator winding principle involved in this invention firstly adopts a flat wire winding form, which can be made using a continuous wave winding process. All windings are continuously formed by molds, eliminating solder joints and welding sides. Only the three-phase leads and the neutral point need to be welded.

[0039] Secondly, this winding principle ensures that all leads are located on the outermost layer of the stator, facilitating full utilization of the stator core yoke space during welding and shortening the axial dimension.

[0040] Furthermore, the welding side wires of this winding principle are completely consistent, regular and neat with low end height, and each branch crosses all slots and layers of the phase, minimizing circulating current.

[0041] In terms of process, this solution can simultaneously form all windings into one piece, with fewer and more convenient span adjustments. Finally, the windings are wound into cylindrical shapes and then radially expanded into the stator slots using equipment.

[0042] Example 1.

[0043] The flat wire continuous winding device involved in this embodiment is a 6-pole, 54-slot device with 3 slots per pole per phase, wherein the number of flat wire winding layers is 8 and the number of branches of the parallel motor is 3.

[0044] Each phase of the flat wire winding device contains three parallel branches. Each branch bypasses all slots of that phase and passes through layers 1 to 8 of the slots, with the first layer being the stator slot closest to the outer diameter and the eighth layer being the slot closest to the inner diameter, thus ensuring the electromagnetic symmetry of each winding branch.

[0045] The rings in the stator slots are defined as follows: the first ring consists of layers 12 in the slot; the second ring consists of layers 34 in the slot; the third ring consists of layers 56 in the slot; and the fourth ring consists of layers 78 in the slot. Figure 2 This is a schematic diagram showing the number of layers and turns in the slot of the flat wire winding.

[0046] During the winding process, the non-lead-out side 23 spans are kept constant at 9, crossing 8 stator slots.

[0047] When the branch circuit is wound around each turn, on the lead-out side 24, the span is constant at 9, crossing 8 stator slots.

[0048] After the branch circuit completes the first loop, it needs to cross loops to enter the next loop. For example, the winding between layers 2 and 3 in the slot, the winding between layers 4 and 5 in the slot, and the winding between layers 6 and 7 in the slot, on the lead wire side 24, if it is located in the outermost slot of the phase, such as in this embodiment, when it is located in slots 4 and 24, the winding span at that location is 11, crossing 10 stator slots.

[0049] After the branch circuit completes the first loop, it needs to cross loops to enter the next loop. For example, the winding between layers 2 and 3 in the slot, the winding between layers 4 and 5 in the slot, and the winding between layers 6 and 7 in the slot, on the lead wire side 24, if it is located in a slot other than the outermost slot of that phase, such as phase U in this embodiment, located in slots 5, 6, 22, and 23, the winding span at that location is 8, crossing 7 stator slots.

[0050] After the branch circuit winds clockwise around all loops, at the outermost 8th layer, it needs to be wound in the same layer and then wound in the opposite direction. The same layer winding follows the principle of cross-loop winding. On the lead wire side 24, if it is located in the outermost slot of the phase, such as U phase in this embodiment, located in slot 15, the winding span at this point is 11, crossing 10 stator slots; if it is located in a slot other than the outermost slot of the phase, such as U phase in this case, located in slots 13 and 14, the winding span at this point is 8, crossing 7 stator slots.

[0051] Figure 3 This is a partial schematic diagram of the leads of a flat wire continuous winding. Leads 1, 2, and 3 are the three branches of the U-phase lead, connected together to form the U-phase lead; leads 10, 11, and 12 are the U-phase neutral points. Leads 7, 8, and 9 are the three branches of the V-phase lead, connected together to form the V-phase lead; leads 16, 17, and 18 are the V-phase neutral points. Leads 13, 14, and 15 are the three branches of the W-phase lead, connected together to form the W-phase lead; leads 4, 5, and 6 are the W-phase neutral points. For the leads of neutral points 4, 5, 6, 10, 11, 12, 16, 17, and 18, depending on the actual situation, one lead for each of the three neutral points (U / V / W phases) is connected together to form three new neutral points.

[0052] Figure 4 A schematic diagram showing the winding principle of the first branch U1 of phase U;

[0053] Figure 5 A schematic diagram illustrating the winding principle of the second branch U2 of phase U;

[0054] Figure 6 This is a schematic diagram illustrating the winding principle of the third branch U3 of phase U.

[0055] Taking the U-phase winding as an example;

[0056] The first branch is set as U1, and the first layer of slot 13 is the starting end of its lead wire. The span is 9, crossing 8 stator slots in sequence, passing through slot 22 (2nd layer), slot 31 (1st layer), slot 40 (2nd layer), slot 49 (1st layer), and slot 4 (2nd layer), completing the first and second layers of the first loop.

[0057] The span becomes 11, crossing 10 stator slots to enter slot 15, layer 3. The span is restored to 9, crossing 8 stator slots, passing through slot 24, layer 4, slot 33, layer 3, slot 42, layer 4, slot 51, layer 3, and slot 6, completing the second round of winding through the third and fourth layers.

[0058] The span becomes 8, crossing 7 stator slots to enter slot 14, layer 5. The span is restored to 9, crossing 8 stator slots, passing through slot 23, layer 6, slot 32, layer 5, slot 41, layer 6, slot 50, layer 5, and slot 5, layer 6 in sequence, completing the third round of winding through the fifth and sixth layers.

[0059] The span becomes 8, crossing 7 stator slots to enter slot 13, layer 7. The span is restored to 9, crossing 8 stator slots, passing through slot 22, layer 8, slot 31, layer 7, slot 40, layer 8, slot 49, layer 7, and slot 4, layer 8 in sequence. The span becomes 11, crossing 10 stator slots to enter slot 15, layer 8, completing the fourth round of winding through layers 7 and 8.

[0060] Then, the reverse winding is performed, with the span restored to 9, crossing 8 stator slots in sequence, passing through slot 6 (7 layers), slot 51 (8 layers), slot 42 (7 layers), slot 33 (8 layers), and slot 24 (7 layers), completing the fourth round of winding for the seventh and eighth layers after the reverse winding.

[0061] The span becomes 11, crossing 10 stator slots to enter slot 13, layer 6. The span is restored to 9, crossing 8 stator slots, passing through slot 4, layer 5, slot 49, layer 6, slot 40, layer 5, slot 31, layer 6, and slot 22, layer 5 in sequence, completing the third round of the fifth and sixth layers of winding after the reverse cross-winding.

[0062] The span becomes 8, crossing 7 stator slots to enter slot 14, layer 4. The span is restored to 9, crossing 8 stator slots, passing through slot 5, layer 3, slot 50, layer 4, slot 41, layer 3, slot 32, layer 4, and slot 23, layer 3, completing the second round of winding in the third and fourth layers after the reverse cross-winding.

[0063] The span becomes 8, crossing 7 stator slots to enter slot 15, layer 2. The span is restored to 9, crossing 8 stator slots, passing through slot 6, layer 1, slot 51, layer 2, slot 42, layer 1, slot 33, layer 2, and slot 24, layer 1, completing the first and second layers of the first turn of the reverse cross-winding, and leading out from slot 24, layer 1, forming the complete U-phase first branch U1 winding.

[0064] The second branch is set as U2, with the first layer of slot 14 as the starting point of its lead wire. The span is 9, crossing 8 stator slots in sequence, passing through slot 23 (2nd layer), slot 32 (1st layer), slot 41 (2nd layer), slot 50 (1st layer), and slot 5 (2nd layer), completing the first and second layers of the first loop.

[0065] The span becomes 8, crossing 7 stator slots to enter slot 13, layer 3. The span is restored to 9, crossing 8 stator slots, passing through slot 22, layer 4, slot 31, layer 3, slot 40, layer 4, slot 49, layer 3, and slot 4, completing the second round of winding through the third and fourth layers.

[0066] The span becomes 11, crossing 10 stator slots to enter slot 15, layer 5. The span is restored to 9, crossing 8 stator slots, passing through slot 24, layer 6, slot 33, layer 5, slot 42, layer 6, slot 51, layer 5, and slot 6, completing the third round of winding through layers 5 and 6.

[0067] The span becomes 8, crossing 7 stator slots to enter slot 14, layer 7. The span is restored to 9, crossing 8 stator slots, passing through slot 23, layer 8, slot 32, layer 7, slot 41, layer 8, slot 50, layer 7, and slot 5, layer 8. The span becomes 8, crossing 7 stator slots to enter slot 13, layer 8, completing the fourth round of winding through layers 7 and 8.

[0068] Then, the reverse winding is performed, with the span restored to 9, crossing 8 stator slots in sequence, passing through slot 4 (7 layers), slot 49 (8 layers), slot 40 (7 layers), slot 31 (8 layers), and slot 22 (7 layers), completing the fourth round of winding for the seventh and eighth layers after the reverse winding.

[0069] The span becomes 8, crossing 7 stator slots to enter slot 14, layer 6. The span is restored to 9, crossing 8 stator slots, passing through slot 5, layer 5, slot 50, layer 6, slot 41, layer 5, slot 32, layer 6, and slot 23, layer 5 in sequence, completing the third round of winding in the reverse direction, layer 5 and layer 6.

[0070] The span becomes 8, crossing 7 stator slots to enter slot 15, layer 4. The span is restored to 9, crossing 8 stator slots, passing through slot 6, layer 3, slot 51, layer 4, slot 42, layer 3, slot 33, layer 4, and slot 24, completing the second round of winding in the third and fourth layers after the reverse cross-winding.

[0071] The span becomes 11, crossing 10 stator slots to enter slot 13, layer 2. The span is restored to 9, crossing 8 stator slots, passing through slot 4, layer 1, slot 49, layer 2, slot 40, layer 1, slot 31, layer 2, and slot 22, layer 1 in sequence, completing the first and second layers of the first turn of the reverse cross-winding, and leading out from slot 22, layer 1 to form the complete U-phase second branch U2 winding.

[0072] The third branch is set as U3, and the first layer of slot 15 is the starting end of its lead wire. The span is 9 (spanning 8 stator slots, passing through slot 24, layer 2, slot 33, layer 1, slot 42, layer 2, slot 51, layer 1, and slot 6, layer 2 in sequence, completing the first loop (the first and second layers of winding).

[0073] The span becomes 8 (crossing 7 stator slots to enter slot 14, layer 3), the span is restored to 9 (crossing 8 stator slots and passing through slot 23, layer 4, slot 32, layer 3, slot 41, layer 4, slot 50, layer 3, and slot 5, layer 4 in sequence, completing the second loop (the third and fourth layers of winding).

[0074] The span becomes 8 (crossing 7 stator slots to enter slot 13, layer 5), the span is restored to 9 (crossing 8 stator slots in sequence through slot 22, layer 6; slot 31, layer 5; slot 40, layer 6; slot 49, layer 5; slot 4, layer 6, completing the third loop (the fifth and sixth layers of winding).

[0075] The span becomes 11 (crossing 10 stator slots to enter slot 15, layer 7), the span returns to 9 (crossing 8 stator slots, passing through slot 24, layer 8, slot 33, layer 7, slot 42, layer 8, slot 51, layer 7, and slot 6, layer 8 in sequence, completing the fourth loop (the seventh and eighth layers of winding), the span becomes 8 (crossing 7 stator slots to enter slot 14, layer 8).

[0076] Then, the reverse winding is performed, and the span is restored to 9 (crossing 8 stator slots, passing through slot 5 (7 layers), slot 50 (8 layers), slot 41 (7 layers), slot 32 (8 layers), and slot 23 (7 layers) in sequence, completing the fourth round (seventh and eighth layers of winding) after the reverse winding.

[0077] The span becomes 8 (crossing 7 stator slots to enter slot 15, layer 6), the span is restored to 9 (crossing 8 stator slots in sequence through slot 6, layer 5; slot 51, layer 6; slot 42, layer 5; slot 33, layer 6; slot 24, layer 5, completing the third round after reverse crossing (the fifth and sixth layers of winding).

[0078] The span becomes 11 (crossing 10 stator slots to enter slot 13, layer 4), the span is restored to 9 (crossing 8 stator slots in sequence through slot 4, layer 3; slot 49, layer 4; slot 40, layer 3; slot 31, layer 4; slot 22, layer 3, completing the second round after reverse crossing (the third and fourth layers of winding).

[0079] The span becomes 8 (crossing 7 stator slots to enter slot 14, layer 2), the span is restored to 9 (crossing 8 stator slots in sequence through slot 5, layer 1; slot 50, layer 2; slot 41, layer 1; slot 32, layer 2; slot 23, layer 1, completing the first loop after reverse cross-winding (the first and second layers of winding, and leading out from slot 23, layer 1, forming a complete U-phase first branch winding).

[0080] The V-phase winding is similar to the U-phase winding. Slot 19, layer 1, is the starting point of the V1 lead; slot 30, layer 1, is the starting point of the V1 lead; slot 20, layer 1, is the starting point of the V2 lead; slot 28, layer 1, is the starting point of the V2 lead; slot 21, layer 1, is the starting point of the V3 lead; and slot 29, layer 1, is the starting point of the V3 lead.

[0081] Similar to the U-phase winding, the W-phase winding is designed with consistent molding process. Slot 16 is the first layer for the W1 lead, slot 27 is the first layer for the V1 lead, slot 17 is the first layer for the W2 lead, slot 25 is the first layer for the W2 lead, slot 18 is the first layer for the V3 lead, and slot 26 is the first layer for the V3 lead. However, the current direction is opposite to that of the winding.

[0082] Example 2.

[0083] As a general technical concept, the present invention also provides a motor stator, wherein the motor stator adopts the above-mentioned flat wire continuous winding device.

[0084] Example 3.

[0085] As a general technical concept, the present invention also provides an electric motor that employs a motor stator with the aforementioned flat wire continuous winding device.

Claims

1. A method of winding a flat wire continuous winding device, characterized in that, The winding method includes M parallel branches for each phase, each branch winding through all slots of the phase and 1-2*K layers of the slots, the first and second layers of the stator slots from the outside being the first turn, the third and fourth layers being the second turn, the 2K-1 and 2K layers being the Kth turn, and the like, K being half of the number of layers of the winding (22), M being greater than or equal to 2, and K being greater than or equal to 2; In the winding forward process, the branch constantly crosses 3*M-1 stator slots on the non-outgoing line side (23); In the winding of each turn, the branch constantly crosses 3*M-1 stator slots on the outgoing line side (24); after winding through the first turn, the branch enters the next turn by crossing turns, on the outgoing line side (24), if it is located in the outermost slot of the phase, it crosses 3*M+1 stator slots, if it is located in the non-outermost slot of the phase, it crosses 3*M-2 stator slots; After the branch winds through all turns, it reverses the winding direction after winding on the outermost layer, and the reverse winding method is the same as the winding method in the winding forward process.

2. The method of winding according to claim 1, characterized in that, The flat wire continuous winding device includes a winding (22), a non-outgoing line side (23), an outgoing line side (24), and an outgoing line (25); the outgoing line side (24) is located above the stator (21); the non-outgoing line side (23) is located below the stator (21); the outgoing line (25) is drawn from the outer layer of the outgoing line side (24) and includes U-phase outgoing lines, V-phase outgoing lines, W-phase outgoing lines, and neutral-point outgoing lines; the winding (22) has 2*K layers, is embedded in the stator (21) with M slots per pole per phase and M parallel motor branches; The number of poles N is greater than or equal to 4; the number of outgoing lines (25) is M*M*2; The neutral-point outgoing line includes U-phase neutral-point outgoing lines, V-phase neutral-point outgoing lines, and W-phase neutral-point outgoing lines; connecting one U-phase neutral-point outgoing line, one V-phase neutral-point outgoing line, and one W-phase neutral-point outgoing line together forms a new neutral point; The winding (22) is wound into a cylindrical shape and expanded radially into the stator slots provided on the stator (21) by the device.

3. The method of winding according to claim 2, characterized in that, In the winding forward process, the branch winds through all turns in a clockwise direction.

4. The method of winding according to claim 3, characterized in that, The winding process uses continuous wave winding, and all windings are continuously formed by a mold.

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