Flat wire motor, power assembly and electric vehicle

Abstract

The invention provides a flat wire motor, a power assembly and an electric vehicle, a motor stator of the flat wire motor comprises a plurality of winding grooves, at least four flat wires are sequentially arranged in each winding groove in a layered manner along the radial direction of the flat wire motor, the flat wires accommodated in the plurality of winding grooves are arranged into three circles of flat wires in a layered manner, and each circle of flat wires is divided into a plurality of groups of flat wires arranged along the circumferential direction of the flat wire motor. And each group of flat wires comprises one flat wire in the same winding groove or a plurality of flat wires which are sequentially and adjacently arranged. The number of the flat wires in each group of the first circle of the flat wires is different from the number of the flat wires in each group of the second circle of the flat wires. The first-layer flat wire of each group of flat wires in the first circle of flat wires is used for being connected with one first-layer flat wire of the other group of flat wires in the first circle of flat wires through two cross-wire sections with different lengths, so that the wiring modes of the first circle of flat wires and the second circle of flat wires in the winding groove are different, and a short-distance winding is formed; therefore, the harmonic magnetic field of the flat wire motor is weakened, and the NVH performance of the flat wire motor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of flat wire motors, and in particular to a flat wire motor, a power assembly and an electric vehicle. Background Art

[0002] At present, the driving motors of new energy vehicles are mainly permanent magnet synchronous motors. In permanent magnet synchronous motors, the cross-sectional shape of the stator winding in the motor stator can be divided into round wire conductors and flat copper wire conductors. The motor using flat copper wire conductors is called a flat wire motor. Traditional round wire motors are affected by the automatic offline process, and it is difficult to achieve a short-pitch winding with three-phase balance. Flat wire motors can effectively improve the slot fill rate, power density and torque density. With the rapid development of the new energy vehicle industry, the requirements for the number of layers, the number of parallel branches and the winding form of flat wire motors are getting higher and higher. At present, the winding method of the existing flat wire motor stator winding is mostly full-pitch winding. The flat wire motor with a full-pitch structure has a high harmonic winding coefficient, and the torque fluctuation is large during operation, which worsens the noise, vibration and acoustic roughness of the motor and reduces the performance of the motor. By setting the stator winding to a short-pitch winding to reduce the harmonic winding coefficient of the flat wire motor, the NVH performance of electric vehicles can be improved. However, the existing flat wire short-pitch winding with balanced multi-branch has a complex structure, which makes the winding processing difficult and winding difficult. In addition, the short-pitch setting method is limited by the winding form, making it difficult to effectively weaken the harmonic winding coefficient while obtaining a higher fundamental winding coefficient, thereby reducing the performance of the flat wire motor. Summary of the invention

[0003] The present application provides a flat wire motor, a power assembly and an electric vehicle.

[0004] In a first aspect, the present application provides a flat wire motor, wherein the motor stator of the flat wire motor includes a plurality of winding slots, wherein at least four flat wires are sequentially arranged in layers in each winding slot along the radial direction of the flat wire motor, wherein the flat wires contained in the plurality of winding slots are sequentially arranged in layers along the radial direction of the flat wire motor into three circles of flat wires, wherein each circle of flat wires is divided into a plurality of groups of flat wires arranged along the circumferential direction of the flat wire motor, wherein each group of flat wires includes a flat wire in the same winding slot or a plurality of flat wires sequentially arranged adjacently. The three circles of flat wires include a first circle of flat wires and a second circle of flat wires arranged adjacently, wherein the distance between the first circle of flat wires and the axis of the flat wire motor along the radial direction of the flat wire motor is greater than the distance between the second circle of flat wires and the axis of the flat wire motor, and the number of flat wires in each group of flat wires in the first circle of flat wires is different from the number of flat wires in each group of flat wires in the second circle of flat wires. Each group of flat wires in the first circle of flat wires includes a first layer of flat wires, and the distance between the first layer of flat wires and the axis of the flat wire motor is greater than the distance between any other flat wire in the winding slot where it is located and the axis of the flat wire motor. The first layer of flat wires of each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires of another group of flat wires in the first circle of flat wires through two cross-wire segments with different lengths.

[0005] In an embodiment of the present application, at least four flat wires are arranged in layers in each winding slot along the radial direction of the flat wire motor, and the flat wires accommodated in the multiple winding slots are arranged in layers as three circles of flat wires along the radial direction of the flat wire motor. Each circle of flat wires is divided into multiple groups of flat wires arranged along the circumferential direction of the flat wire motor. Each group of flat wires includes a flat wire in the same winding slot or multiple flat wires arranged adjacent to each other in sequence, which is beneficial to realize multi-layer series connection of the winding, reduce eddy current loss of the flat wire, improve the efficiency of the flat wire motor when running at high speed, and increase the diversity of the number of series turns of the winding, which is beneficial to improve the performance of the flat wire motor.

[0006] In the embodiment of the present application, the three-turn flat wire includes a first turn of flat wire and a second turn of flat wire arranged adjacently, and the distance between the first turn of flat wire and the axis of the flat wire motor along the radial direction of the flat wire motor is greater than the distance between the second turn of flat wire and the axis of the flat wire motor, so that the first turn of flat wire is arranged close to the bottom of the winding slot. The number of flat wires in each group of flat wires of the first turn of flat wire is different from the number of flat wires in each group of flat wires of the second turn of flat wire, which is conducive to making the routing mode of the first turn of flat wire and the second turn of flat wire in the winding slot different, which is conducive to forming a short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0007] In an embodiment of the present application, each group of flat wires in the first circle of flat wires includes a first layer of flat wires, and the distance between the first layer of flat wires and the axis of the flat wire motor is greater than the distance between any other flat wire in the winding slot in which it is located and the axis of the flat wire motor, so that the first layer of flat wires is a flat wire located at the bottom layer of the winding slot. The first layer of flat wires of each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires of another group of flat wires in the first circle of flat wires through two span segments of different lengths, so that the connection between the first layer of flat wires in the first circle of flat wires has different spans, which is conducive to achieving a continuous short-distance effect for the winding in the motor stator of the three-circle flat wire, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0008] In one embodiment, the number of flat wires in each group of flat wires in the first circle of flat wires is smaller than the number of flat wires in each group of flat wires in the second circle of flat wires.

[0009] In an embodiment of the present application, the number of flat wires in each group of the first circle of flat wires is smaller than the number of flat wires in each group of the second circle of flat wires, so that the routing method of the winding can be suitable for arranging a more diverse number of N flat wires of different layers in the winding slots, so that the connections between the flat wires of different numbers of layers have different spans, which is conducive to achieving continuous short distance for short-distance windings of a special number of layers.

[0010] In one embodiment, the number of flat wires in each group of flat wires in the first circle of flat wires is greater than the number of flat wires in each group of flat wires in the second circle of flat wires.

[0011] In an embodiment of the present application, the number of flat wires in each group of the first circle of flat wires is greater than the number of flat wires in each group of the second circle of flat wires, so that the routing method of the winding can be suitable for arranging a more diverse number of N flat wires of different layers in the winding slots, so that the connections between the flat wires of different numbers of layers have different spans, which is conducive to achieving continuous short distance for short-distance windings of a special number of layers.

[0012] In one embodiment, each group of flat wires in the second circle of flat wires further includes a second layer of flat wires and a third layer of flat wires, and the second layer of flat wires is arranged between the third layer of flat wires and the first layer of flat wires in the first circle of flat wires along the radial direction of the flat wire motor. A second layer of flat wires in each group of flat wires in the second circle of flat wires is connected to a third layer of flat wires in another group of flat wires in the second circle of flat wires through the same cross-wire segment.

[0013] In an embodiment of the present application, a second-layer flat wire of each group of flat wires in the second circle of flat wires is connected to a third-layer flat wire of another group of flat wires in the second circle of flat wires through the same cross-line segment, so that the routing of the winding is more regular, which is beneficial to making the structure of each parallel branch symmetrical and avoiding the generation of circulating current.

[0014] In one embodiment, each group of flat wires in the first circle of flat wires also includes a second layer of flat wires, and one second layer of flat wires is arranged adjacent to one first layer of flat wires in the radial direction of the flat wire motor, and each group of flat wires in the second circle of flat wires includes a third layer of flat wires, and one third layer of flat wires in the second circle of flat wires is arranged adjacent to one second layer of flat wires in the first circle of flat wires in the radial direction of the flat wire motor. Each second layer of flat wires in the first circle of flat wires is connected to one third layer of flat wires in each group of flat wires in the second circle of flat wires through the same cross-wire segment.

[0015] In an embodiment of the present application, each second-layer flat wire of the first circle of flat wires is connected to a third-layer flat wire of each group of flat wires of the second circle of flat wires through the same cross-line segment, so that the routing of the winding is more regular, which is beneficial to making the structure of each parallel branch symmetrical and avoiding the generation of circulating current.

[0016] In one embodiment, the number of winding slots spanned by a cross-wire segment connected to each second-layer flat wire of the first circle of flat wire is different from the number of winding slots spanned by a cross-wire segment connected to each first-layer flat wire of the first circle of flat wire.

[0017] In an embodiment of the present application, the number of winding slots spanned by a cross-wire segment connected to each second layer of flat wires of the first circle of flat wires is different from the number of winding slots spanned by a cross-wire segment connected to each first layer of flat wires of the first circle of flat wires, which is beneficial for making the windings form short-distance windings, thereby helping to weaken the harmonic magnetic field of the flat wire motor and improve the NVH performance of the flat wire motor.

[0018] In one embodiment, each group of flat wires in the first circle of flat wires further includes a second layer of flat wires and a third layer of flat wires, and the second layer of flat wires is arranged between the first layer of flat wires and the third layer of flat wires along the radial direction of the flat wire motor. A second layer of flat wires in each group of flat wires in the first circle of flat wires is connected to a third layer of flat wires in another group of flat wires in the first circle of flat wires through the same cross-wire segment.

[0019] In an embodiment of the present application, a second-layer flat wire of each group of flat wires in the first circle of flat wires is connected to a third-layer flat wire of another group of flat wires in the first circle of flat wires through the same cross-line segment, which can make the routing of the winding more regular, help to make the structure of each parallel branch symmetrical, and help to avoid the generation of circulating current.

[0020] In one embodiment, the number of winding slots spanned by a cross-wire segment connected to a second-layer flat wire of each group of flat wires in the first circle of flat wires is different from the number of winding slots spanned by a cross-wire segment connected to a first-layer flat wire of each group of flat wires in the first circle of flat wires.

[0021] In an embodiment of the present application, the number of winding slots spanned by a cross-wire segment connected to a second-layer flat wire of each group of flat wires in the first circle of flat wires is different from the number of winding slots spanned by a cross-wire segment connected to a first-layer flat wire of each group of flat wires in the first circle of flat wires, so that the connections between the flat wires can have different spans, which is beneficial for the windings to form short-distance windings, to weaken the harmonic magnetic field of the flat wire motor, and to improve the NVH performance of the flat wire motor.

[0022] In one embodiment, the three circles of flat wire include a third circle of flat wire. The first circle of flat wire, the second circle of flat wire and the third circle of flat wire are arranged in sequence along the radial direction of the flat wire motor. The number of flat wires in each group of flat wires in the third circle of flat wire is different from the number of flat wires in each group of flat wires in the second circle of flat wire.

[0023] In an embodiment of the present application, the first circle of flat wires, the second circle of flat wires and the third circle of flat wires are arranged in sequence along the radial direction of the flat wire motor, the number of flat wires in each group of flat wires of the third circle of flat wires is different from the number of flat wires in each group of flat wires of the second circle of flat wires, and the number of flat wires in each group of flat wires of the first circle of flat wires is different from the number of flat wires in each group of flat wires of the second circle of flat wires, that is, the number of flat wires in each group of the first circle of flat wires, the second circle of flat wires and the third circle of flat wires are not all equal, so that the connection between the flat wires can have different spans, which is beneficial for the winding to form a continuous short-distance winding, which is beneficial for weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0024] In one embodiment, the sum of the number of flat wires in a group of flat wires in the first circle of flat wires, the second circle of flat wires, and the third circle of flat wires is N, where N is an even number, and each group of flat wires in the third circle of flat wires includes an Nth layer of flat wires, and the distance between the Nth layer of flat wires and the axis of the flat wire motor is smaller than the distance between any other flat wire in the third circle of flat wires except the Nth layer of flat wires and the axis of the flat wire motor. The Nth layer of flat wires in each group of flat wires in the third circle of flat wires is used to connect an Nth layer of flat wires in another group of flat wires in the third circle of flat wires through a cross-line segment. The number of winding slots spanned by a cross-line segment connected to each Nth layer of flat wires in a group of flat wires in the third circle of flat wires is the same.

[0025] In the embodiment of the present application, the distance between the Nth layer of flat wire and the axis of the flat wire motor is smaller than the distance between any other flat wire of the third circle of flat wire except the Nth layer of flat wire and the axis of the flat wire motor, that is, the Nth layer of flat wire of the third circle of flat wire is the notch layer of the winding slot.

[0026] In the embodiment of the present application, the Nth layer of flat wires in each group of flat wires in the third circle of flat wires is used to connect an Nth layer of flat wires in another group of flat wires in the third circle of flat wires through a jumper segment, so that the Nth layer of flat wires can be jumpered in the same layer.

[0027] In an embodiment of the present application, the number of winding slots spanned by a crossing line segment connected to each Nth layer of a group of flat wires of the third circle of flat wires is the same, which is conducive to making the winding routing more regular, making the structure of each parallel branch symmetrical, and avoiding the generation of circulating current.

[0028] In one embodiment, the sum of the numbers of flat wires in a group of the first circle of flat wires, the second circle of flat wires, and the third circle of flat wires is N, where N is an odd number. Each group of flat wires in the third circle of flat wires includes an N-1th layer of flat wires and an Nth layer of flat wires arranged adjacently, and the spacing between the Nth layer of flat wires and the axis of the flat wire motor is smaller than the spacing between any other flat wire in the third circle of flat wires except the Nth layer of flat wires and the axis of the flat wire motor.

[0029] In the embodiment of the present application, the distance between the Nth layer of flat wire and the axis of the flat wire motor is smaller than the distance between any other flat wire of the third circle of flat wire except the Nth layer of flat wire and the axis of the flat wire motor, that is, the Nth layer of flat wire of the third circle of flat wire is the notch layer of the winding slot.

[0030] In one embodiment, the N-1th layer of flat wires in each group of flat wires in the third circle of flat wires is used to connect an Nth layer of flat wires in another group of flat wires in the third circle of flat wires through a cross-line segment. The number of winding slots spanned by a cross-line segment connected to each N-1th layer of flat wires in the third circle of flat wires is the same.

[0031] In the embodiment of the present application, the N-1th layer of flat wires of each group of flat wires in the third circle of flat wires is used to connect an Nth layer of flat wires of another group of flat wires in the third circle of flat wires through a cross-line segment. Thus, the N-1th layer of flat wires can be cross-layer connected with the Nth layer of flat wires, which is conducive to realizing the series connection of the winding branches.

[0032] In the embodiment of the present application, the number of winding slots spanned by a cross-line segment connected to each N-1th layer of flat wire of the third circle of flat wire is the same, which is conducive to making the winding routing more regular, making the structure of each parallel branch symmetrical, and avoiding the generation of circulating current.

[0033] In one embodiment, each circle of flat wire is divided into a plurality of phase bands arranged along the circumference of the flat wire motor, and each phase band includes three groups of flat wires, wherein a phase band of the first circle of flat wires and a phase band of the second circle of flat wires are offset by one winding slot.

[0034] In an embodiment of the present application, a phase band of the first circle of flat wire and a phase band of the second circle of flat wire are offset by one winding slot, so that the connection between the flat wires can have different spans, which is conducive to forming a short-distance winding, thereby reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor.

[0035] In a second aspect, the present application provides a power assembly, which includes a reducer and a flat wire motor as in the first aspect, wherein the motor shaft of the flat wire motor is used for transmission connection to the input shaft of the reducer, and the output shaft of the reducer is used for driving the wheels of the electric vehicle.

[0036] In the flat wire motor in the embodiment of the present application, by making the number of flat wires in each group of the first circle of flat wires in the motor stator different from the number of flat wires in each group of flat wires in the second circle of flat wires, the first layer of flat wires in each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires of another group of flat wires in the first circle of flat wires through two cross-line segments of different lengths, which is beneficial to making the routing methods of the first circle of flat wires and the second circle of flat wires in the winding slot different, and is beneficial to forming a short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor, improving the NVH performance of the flat wire motor, and further improving the NVH performance of the powertrain.

[0037] In a third aspect, the present application provides an electric vehicle, comprising a frame, a power battery and a power assembly as in the second aspect, wherein the frame is used to fix the power battery and the power assembly, the power battery is used to power a motor, and the motor is used to drive the wheels of the electric vehicle through a reducer.

[0038] The powertrain in the embodiment of the present application includes a flat wire motor. The motor stator in the flat wire motor makes the number of flat wires in each group of flat wires in the first circle of flat wires and the number of flat wires in each group of flat wires in the second circle of flat wires different. The first layer of flat wires in each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires of another group of flat wires in the first circle of flat wires through two cross-line segments of different lengths, which is beneficial to make the routing methods of the first circle of flat wires and the second circle of flat wires in the winding slot different, which is beneficial to form a short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor, improving the NVH performance of the flat wire motor, and then improving the NVH performance of the powertrain, thereby enhancing the overall performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0040] Figure 1 is a schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0041] Figure 2 is a schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0042] Figure 3 It is a schematic diagram of a top view of a structure in which a flat wire is inserted into a winding slot provided in an embodiment of the present application;

[0043] Figure 4 It is a structural schematic diagram of a card issuing coil provided in an embodiment of the present application;

[0044] Figure 5 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0045] Figure 6 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0046] Figure 7 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0047] Figure 8 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0048] Fig. 9 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0049] Fig.10 is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0050] Fig.11is a connection diagram of three parallel branches of a U-phase winding provided in an embodiment of the present application;

[0051] Fig.12 It is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application;

[0052] Fig.13 is another connection schematic diagram of the three-phase winding ends provided in an embodiment of the present application;

[0053] Fig.14 It is a structural schematic diagram of the crown end of the motor stator in the first embodiment of the present application;

[0054] Fig.15 It is a structural schematic diagram of the welding end of the motor stator in the first embodiment of the present application;

[0055] Fig.16 It is a torque pulsation comparison diagram of the winding peak operating point in Example 1 of the present application. DETAILED DESCRIPTION

[0056] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0057] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0058] NVH: It is the abbreviation of Noise, Vibration and Harshness, which refers to noise, vibration and acoustic roughness.

[0059] Busbar: It is a multi-layer composite structure connection bar, which can be regarded as the core channel of the power distribution system. Compared with the traditional wiring method, it has significant advantages such as convenient design, low impedance, strong anti-interference ability, high reliability, good space utilization and quick assembly.

[0060] Floor: is a function that rounds the calculated value down to an integer.

[0061] Hairpin coil: shaped like a "U", first formed and then plugged in, and finally welded on one side.

[0062] Ipin card cable: shaped like an "I", directly plug in the cable and then weld on both sides.

[0063] Number of poles: the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1. Therefore, if the number of pole pairs of the motor is 1, 2, 3, or 4, then the number of poles of the motor is 2, 4, 6, or 8.

[0064] Pole pitch: The pole pitch of the winding refers to the distance of the circular surface occupied by each magnetic pole. For AC motors, it refers to the slot distance occupied by each magnetic pole along the inner circle of the stator core. Expressed in the number of slots, the pole pitch f is equal to the ratio of the number of stator slots Z to the number of magnetic poles 2p, that is, f=z / 2p.

[0065] Pitch: also known as the span of the coil, refers to the number of slots occupied by the two effective sides of a single coil. For example, the pitch y=6, that is, the two effective sides of the coil are separated by 6 slots, that is, the two effective sides are embedded in the 1st slot and the 7th slot respectively.

[0066] Number of slots per pole per phase q: The number of slots occupied by each phase winding under each magnetic pole is called the number of slots per pole per phase.

[0067] Phase belt: The conductors under each pole are evenly distributed to each phase. The range occupied by each phase winding under each pole face is expressed in electrical angles and is called phase belt.

[0068] In addition, the winding methods of the stator winding include full-pitch winding and short-pitch winding, wherein the full-pitch winding refers to the pitch of the stator winding being equal to the pole pitch, and the short-pitch winding refers to the pitch of the stator winding being less than the pole pitch.

[0069] In order to weaken the harmonic magnetic field of the flat wire motor and improve the NVH performance of the flat wire motor, the present application provides a motor stator of a flat wire motor including a plurality of winding slots, in each winding slot at least 4 flat wires are sequentially arranged in layers along the radial direction of the flat wire motor, the flat wires contained in the plurality of winding slots are sequentially arranged in layers along the radial direction of the flat wire motor into three circles of flat wires, each circle of flat wires is divided into a plurality of groups of flat wires arranged along the circumferential direction of the flat wire motor, each group of flat wires includes a flat wire in the same winding slot or a plurality of flat wires sequentially arranged adjacently. The three circles of flat wires include a first circle of flat wires and a second circle of flat wires arranged adjacently, the distance between the first circle of flat wires and the axis of the flat wire motor along the radial direction of the flat wire motor is greater than the distance between the second circle of flat wires and the axis of the flat wire motor, and the number of flat wires in each group of flat wires in the first circle of flat wires is different from the number of flat wires in each group of flat wires in the second circle of flat wires. Each group of flat wires in the first circle of flat wires includes a first layer of flat wires, and the distance between the first layer of flat wires and the axis of the flat wire motor is greater than the distance between any other flat wire in the winding slot where the first layer of flat wires is located and the axis of the flat wire motor. The first layer of flat wires in each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires in another group of flat wires in the first circle of flat wires through two cross-line segments of different lengths. The number of flat wires in each group of flat wires in the first circle of flat wires is different from the number of flat wires in each group of flat wires in the second circle of flat wires. The first layer of flat wires in each group of flat wires in the first circle of flat wires is used to connect a first layer of flat wires in another group of flat wires in the first circle of flat wires through two cross-line segments of different lengths, which is conducive to making the routing methods of the first circle of flat wires and the second circle of flat wires in the winding slot different, which is conducive to forming a short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0070] Figure 1It is a schematic diagram of the structure of the electric vehicle 1 provided in an embodiment of the present application.

[0071] In one embodiment, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30, and wheels 40. Figure 1 As shown, the power assembly 10 and the power battery 30 are fixed to the frame 20. The power assembly 10 is used to receive power from the power battery 30 and to drive the wheel 40. In the embodiment of the present application, the power battery 30 may also be referred to as a battery pack. In the embodiment of the present application, the frame 20 may also be referred to as a vehicle body. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device.

[0072] Figure 2 It is a schematic diagram of the structure of the powertrain 10 provided in an embodiment of the present application.

[0073] In one embodiment, the power assembly 10 includes a flat wire motor 100 and a reducer 200. Figure 2 As shown, the flat wire motor 100 includes a motor shaft (not shown), a motor stator 101 and a motor rotor (not shown), and the reducer 200 includes a gear assembly (not shown), an input shaft (not shown) and an output shaft (not shown), wherein the input shaft receives the power transmitted by the motor shaft of the flat wire motor 100 and transmits the power to the output shaft through the gear assembly. The gear assembly can be set as required, and can be a single-speed reduction gear assembly, a two-speed or multi-speed reduction gear assembly. The motor rotor is fixedly sleeved on the motor shaft, and the motor stator 101 drives the motor rotor to rotate after receiving alternating current, thereby driving the motor shaft to rotate. The motor shaft of the flat wire motor 100 is used to be connected to the input shaft of the reducer 200 in a transmission manner, thereby driving the wheels 40 of the electric vehicle 1 to travel.

[0074] In the embodiment of the present application, the flat wire motor 100 and the reducer 200 are arranged along the motor axial direction, and the motor shaft of the flat wire motor 100 is fixed to the input shaft of the reducer 200 .

[0075] In one embodiment, the power assembly 10 further includes a motor controller 300 , which is used to convert the direct current output by the power battery 30 into alternating current, and provide the alternating current to power the flat wire motor 100 .

[0076] The existing full-pitch windings and conventional flat wire short-pitch windings in flat wire motors have complex structures, which makes winding processing difficult and winding difficult. The conventional short-pitch winding method is limited by the winding form, and it is difficult to effectively weaken the harmonic winding coefficient while obtaining a higher fundamental winding coefficient, thereby reducing the performance of the flat wire motor. Moreover, the current short-pitch winding with 3 slots per pole and per phase is usually only suitable for motor stators with a specific number of winding layers that is a multiple of 3. For layers that are not an integer multiple of 3, such as 5, 7, 8, and 10 layers, the existing design scheme is difficult to achieve continuous short pitch and has a limited application range.

[0077] The present application provides a flat wire motor that can be applied to odd-numbered and even-numbered windings, and can achieve a continuous short-distance effect for a flat wire winding with 3 slots per pole per phase, while maximizing and simultaneously weakening 6p and 12p harmonics, reducing winding AC losses, and simplifying the winding insertion process.

[0078] The flat wire motor provided in the embodiments of the present application will be described in detail below.

[0079] Figure 3 1 is a schematic top view of the structure in which the flat wire 120 provided in the embodiment of the present application is inserted into the winding slot 110. Figure 4 is a schematic diagram of the structure of the card issuing coil 130 provided in an embodiment of the present application, Figure 5 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Figure 6 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Figure 7 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Figure 8 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Fig. 9 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Fig.10 : is a connection diagram of three parallel branches of the U-phase winding provided in an embodiment of the present application, Fig.11 It is a connection diagram of the three parallel branches of the U-phase winding provided in an embodiment of the present application.

[0080] In one embodiment, the motor stator 101 of the flat wire motor 100 includes a stator core and a stator winding. Figure 3 As shown, the stator core includes a plurality of winding slots 110. The number of the plurality of winding slots 110 may be a multiple of 6. In one embodiment, the number of the winding slots 110 is 54. The plurality of winding slots 110 are arranged on the inner wall of the stator core and are evenly arranged along the circumferential direction of the inner wall of the stator core. Any winding slot 110 extends in the axial direction of the stator core and passes through the inner wall of the stator core along the axial direction of the stator core.

[0081] In one embodiment, the motor stator 101 of the flat wire motor 100 includes a flat wire 120 inserted into a winding slot 110, and the cross section of the flat wire 120 may be rectangular. The flat wires 120 in all winding slots 110 are connected to form a stator winding. In one embodiment, the flat wire 120 is copper, and the flat wire 120 may also be called a conductor.

[0082] like Figure 3 and Figure 5As shown, N flat wires 120 may be arranged in each winding slot 110, and the N flat wires 120 are arranged in layers along the radial direction R of the flat wire motor, where N is an integer greater than or equal to 4, and the N flat wires 120 may also be referred to as L layers of flat wires 120, where N is the same as L. The L layers of flat wires 120 in each winding slot 110 are sequentially divided into L1 layers of flat wires, L2 layers of flat wires, L3 layers of flat wires, ..., L(N-1) layers of flat wires, and L(N) layers of flat wires along the radial direction R of the flat wire motor. In one embodiment, L may be 4, 5, 7, or 8.

[0083] like Figure 3 and Figure 5 As shown, Figure 5 For example, in Figure 5 The first column on the left is the layer number of the flat wire 120 in each winding slot 110. In one embodiment, L is 7, that is, each winding slot 110 is provided with 7 layers of flat wires, and the 7 layers of flat wires are respectively recorded as L1 layer flat wire, L2 layer flat wire, L3 layer flat wire, L4 layer flat wire, L5 layer flat wire, L6 layer flat wire, and L7 layer flat wire, wherein the L1 layer flat wire is the flat wire 120 located at the bottom of the winding slot 110, and can also be called the first layer flat wire 121, and the L7 layer flat wire is the flat wire 120 located at the notch of the winding slot 110, and can also be called the Nth layer flat wire 129.

[0084] Taking a three-phase motor as an example, the L-layer flat wires in all winding slots 110 can form a three-phase winding by grouping and connecting, namely, the first phase winding, the second phase winding and the third phase winding, corresponding to the U phase winding, the V phase winding and the W phase winding respectively. Any phase winding in the three-phase winding can include multiple phase units. When connected, the phase units of the first phase winding, the phase units of the second phase winding and the phase units of the third phase winding are arranged periodically in sequence along the inner wall of the stator core. Among them, each phase unit of each phase winding is a pole phase, and the number of winding slots corresponding to each phase unit is the number of slots per pole per phase.

[0085] Each phase unit of each phase winding can be divided into three phase bands 140, and the adjacent phase bands 140 of the same phase unit are offset by one winding slot. All the flat wires 120 in each phase band 140 with the same offset in the three-phase winding form a circle of flat wires 120, for example, Figure 5As shown, the L1-layer flat wires and L2-layer flat wires in the 10th, 11th, and 12th slots of the U-phase winding constitute a phase belt 140a of the U-phase winding, the L3-layer flat wires, L4-layer flat wires, and L5-layer flat wires in the 9th, 10th, and 11th slots constitute a phase belt 140b, and the L6-layer flat wires and L7-layer flat wires in the 8th, 9th, and 10th slots constitute a phase belt 140c. The above three phase belts 140 constitute a phase unit of the U phase. Among them, all L1-layer flat wires and L2-layer flat wires constitute a first circle of flat wires 120a, all L3-layer flat wires, L4-layer flat wires, and L5-layer flat wires constitute a second circle of flat wires 120b, and all L6-layer flat wires and L7-layer flat wires constitute a third circle of flat wires 120c. A flat wire 120 or a plurality of flat wires 120 arranged adjacent to each other in a phase band 140 a of the U-phase winding, which belong to the same winding slot 110 , constitutes a group of flat wires 1201 , and each phase band 140 includes three groups of flat wires 1201 .

[0086] like Figure 4 As shown, in one embodiment, the flat wire 120 is a part of the hairpin coil 130. In one embodiment, the hairpin coil 130 is U-shaped, and the hairpin coil 130 can also be called Upin. In one embodiment, the hairpin coil 130 includes an insertion wire segment 131 arranged in the winding slot 110, and a cross-wire segment 132 and a welding segment 133 arranged outside the winding slot 110. The two insertion wire segments 131 arranged in the winding slot 110 are two flat wires 120, and the two insertion wire segments 131 of each hairpin coil 130 are respectively inserted in two different winding slots 110. The cross-wire segment 132 can also be called a crown end 132a, and the welding segment 133 can also be called a welding end 133a. The crown end 132a and the welding end 133a are distributed at both ends of the stator core along the axial direction of the flat wire motor. The card issuing coil 130 connects the two insertion wire segments 131 via the cross-wire segment 132 , that is, the cross-wire segment 132 connects the two flat wires 120 .

[0087] like Figures 5 to 11 As shown, the first row of horizontal coordinates in the figure represents the slot number of the winding slot 110. In the embodiment of the present application, the multiple winding slots 110 of the motor stator 101 are numbered in sequence along the circumferential direction C of the flat wire motor, and each winding slot 110 corresponds to a slot number. The number of slots of the winding slots 110 spaced between two flat wires 120 refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 are located. In the embodiment of the present application, the span of the hairpin coil 130 refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 of the hairpin coil 130 are located. In the embodiment of the application, the span of the welding layer refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 connected by the two welding segments 133 welded to each other are located. The number of slots of the winding slots 110 spanned by the cross-line segment 132 refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 connected by the cross-line segment 132 are located.

[0088] In one embodiment, a motor stator 101 of a flat wire motor 100 includes a plurality of winding slots 110, in each winding slot 110 at least four flat wires 120 are sequentially arranged in layers along a radial direction R of the flat wire motor, the flat wires 120 accommodated in the plurality of winding slots 110 are sequentially arranged in layers into three circles of flat wires 120 along a radial direction R of the flat wire motor, each circle of flat wires 120 is divided into a plurality of groups of flat wires 1201 arranged along a circumferential direction C of the flat wire motor, each group of flat wires 1201 includes a flat wire 120 in the same winding slot 110 or a plurality of flat wires 120 sequentially arranged adjacent to each other. Among them, the three circles of flat wire 120 include a first circle of flat wire 120a and a second circle of flat wire 120b arranged adjacent to each other. Along the radial direction R of the flat wire motor, the distance between the first circle of flat wire 120a and the axis of the flat wire motor 100 is greater than the distance between the second circle of flat wire 120b and the axis of the flat wire motor 100. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wire 120a is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wire 120b. Each group of flat wires 1201 in the first circle of flat wires 120a includes a first layer of flat wires 121, and the distance between the first layer of flat wires 121 and the axis of the flat wire motor 100 is greater than the distance between any other flat wire 120 in the winding slot 110 where it is located and the axis of the flat wire motor 100. The first layer of flat wires 121 of each group of flat wires 1201 in the first circle of flat wires 120a is used to connect a first layer of flat wires 121 of another group of flat wires 1201 in the first circle of flat wires 120a through two cross-wire segments 132 with different lengths.

[0089] In an embodiment of the present application, at least four flat wires 120 are arranged in layers in each winding slot 110 along the radial direction R of the flat wire motor. The flat wires 120 accommodated in the multiple winding slots 110 are arranged in layers as three circles of flat wires 120 along the radial direction R of the flat wire motor. Each circle of flat wires 120 is divided into multiple groups of flat wires 1201 arranged along the circumferential direction C of the flat wire motor. Each group of flat wires 1201 includes a flat wire 120 in the same winding slot 110 or multiple flat wires 120 arranged adjacent to each other in sequence, which is beneficial to realize multi-layer series connection of the winding, reduce the eddy current loss of the flat wire 120, improve the efficiency of the flat wire motor 100 when running at high speed, and increase the diversity of the number of series turns of the winding, which is beneficial to improve the performance of the flat wire motor 100.

[0090] In the embodiment of the present application, the three-circle flat wire 120 includes a first circle of flat wire 120a and a second circle of flat wire 120b arranged adjacently, and the distance between the first circle of flat wire 120a and the axis of the flat wire motor 100 along the radial direction R of the flat wire motor is greater than the distance between the second circle of flat wire 120b and the axis of the flat wire motor 100, so that the first circle of flat wire 120a is arranged close to the bottom of the winding slot 110. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wire 120a and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wire 120b are different, which is conducive to making the routing mode of the first circle of flat wire 120a and the second circle of flat wire 120b in the winding slot 110 different, which is conducive to forming a short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0091] In the embodiment of the present application, each group of flat wires 1201 of the first circle of flat wires 120a includes a first layer of flat wires 121, and the distance between the first layer of flat wires 121 and the axis of the flat wire motor 100 is greater than the distance between any other flat wire 120 in the winding slot 110 where the first layer of flat wires 121 is located and the axis of the flat wire motor 100, so that the first layer of flat wires 121 is the flat wire 120 located at the bottom of the slot of the winding slot 110. The first layer of flat wires 121 of each group of flat wires 1201 in the first circle of flat wires 120a is used to connect a first layer of flat wires 121 of another group of flat wires 1201 in the first circle of flat wires 120a through two different lengths of span segments 132, so that the connection between the first layer of flat wires 121 in the first circle of flat wires 120a has different spans, which is conducive to achieving a continuous short-distance effect of the winding in the motor stator 101 of the three circles of flat wires 120, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0092] like Figures 5 to 11 As shown, the length of the cross-line segment 132 of the first circle of flat wires 120a connecting the first layer of flat wires 121 of the 3rd groove in one group of flat wires 1201 and the first layer of flat wires 121 of the 10th groove in another group of flat wires 1201 is different from the length of the cross-line segment 132 of the first layer of flat wires 121 of the 2nd groove in one group of flat wires 1201 and the first layer of flat wires 121 of the 12th groove in another group of flat wires 1201 in the first circle of flat wires 120a.

[0093] In one embodiment, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120 a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120 b .

[0094] In the embodiment of the present application, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b, so that the routing method of the winding can be suitable for arranging a more diverse number of N flat wires 120 of different layers in the winding slot 110, so that the connections between the flat wires 120 of different numbers of layers have different spans, which is conducive to achieving continuous short distance for short-distance windings with a special number of layers.

[0095] like Figure 5 and Figure 6 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 2, and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 3. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0096] like Figure 7 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 1, and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 2. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0097] like Fig. 9 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 2, and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 4. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0098] like Fig.11 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 3, and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 4. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is less than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0099] In one embodiment, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120 a is greater than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120 b .

[0100] In the embodiment of the present application, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is greater than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b, so that the routing method of the winding can be suitable for arranging a more diverse number of N flat wires 120 of different layers in the winding slot 110, so that the connections between the flat wires 120 of different numbers of layers have different spans, which is conducive to achieving continuous short distance for short-distance windings with a special number of layers.

[0101] like Figure 8 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 2, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 1, and the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is greater than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b, so that the routing method of the winding can be suitable for arranging more diverse N flat wires 120 of different numbers of layers in the winding slot 110, which is beneficial to realize continuous short-distance short-distance windings with a special number of layers.

[0102] like Fig.10 As shown, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is 3, and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 2. The number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a is greater than the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0103] In one embodiment, the number of winding slots 110 spanned by a cross-wire segment 132 connected to a first layer of flat wires 121 of a group of flat wires 1201 of the first circle of flat wires 120a is less than the number of winding slots 110 spanned by a cross-wire segment 132 connected to a first layer of flat wires 121 of another group of flat wires 1201 of the first circle of flat wires 120a.

[0104] In an embodiment of the present application, the two crossing wire segments 132 connected by the first layer of flat wires 121 of the two groups of flat wires 1201 in the first circle of flat wires 120a have different numbers of slots in the winding slots 110 spanned by them, so that the connections between the flat wires 120 can have different spans, so that the first circle of flat wires 120a can form a short-distance winding, which is beneficial to weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0105] like Figures 5 to 11As shown, the number of winding slots 110 crossed by a cross-line segment 132 connected to the first layer of flat wire 121 in the third slot of the first circle of flat wire 120a is 7, the number of winding slots 110 crossed by a cross-line segment 132 connected to the first layer of flat wire 121 in the second slot of the first circle of flat wire 120a is 10, and the number of winding slots 110 crossed by a cross-line segment 132 connected to the first layer of flat wire 121 in the third slot of the first circle of flat wire 120a is less than the number of winding slots 110 crossed by a cross-line segment 132 connected to the first layer of flat wire 121 in the second slot of the first circle of flat wire 120a.

[0106] In one embodiment, the first layers of flat wires 121 of two groups of flat wires 1201 of the first circle of flat wires 120a are arranged adjacent to each other, and the first layers of flat wires 121 of the other two groups of flat wires 1201 connected to the first layers of flat wires 121 of the two groups of flat wires 1201 in the first circle of flat wires 120a are separated by a winding slot 110 .

[0107] In the embodiment of the present application, the first layers of flat wires 121 of the two groups of flat wires 1201 of the first circle of flat wires 120a are arranged adjacent to each other, and the first layers of flat wires 121 of the other two groups of flat wires 1201 in the first circle of flat wires 120a connected to the first layers of flat wires 121 of the two groups of flat wires 1201 are separated by a winding slot 110, so that the first circle of flat wires 120a can form a short-distance winding, which is beneficial to weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0108] like Figures 5 to 11 As shown, the first layer of flat wires 121 in the 2nd groove of the first circle of flat wires 120a and the first layer of flat wires 121 in the 3rd groove are arranged adjacent to each other, and the first layer of flat wires 121 in the 12th groove connected to the first layer of flat wires 121 in the 2nd groove in the first circle of flat wires 120a and the first layer of flat wires 121 in the 10th groove connected to the first layer of flat wires 121 in the 3rd groove in the first circle of flat wires 120a are separated by an 11th groove.

[0109] In one embodiment, each group of flat wires 1201 of the second circle of flat wires 120b further includes a second layer of flat wires 122 and a third layer of flat wires 123, and the second layer of flat wires 122 are arranged between the third layer of flat wires 123 and the first layer of flat wires 121 of the first circle of flat wires 120a along the radial direction R of the flat wire motor. Among them, one second layer of flat wires 122 of each group of flat wires 1201 of the second circle of flat wires 120b is connected to one third layer of flat wires 123 of another group of flat wires 1201 of the second circle of flat wires 120b through the same type of cross-wire segment 132.

[0110] In the embodiment of the present application, a second-layer flat wire 122 of each group of flat wires 1201 of the second circle of flat wires 120b is connected to a third-layer flat wire 123 of another group of flat wires 1201 of the second circle of flat wires 120b through the same cross-line segment 132, so that the routing of the winding is more regular, which is beneficial to making the structure of each parallel branch symmetrical and avoiding the generation of circulating current.

[0111] like Figure 7 As shown, the cross-line segment 132 connecting the second layer flat wire 122 of the 1st groove and the third layer flat wire 123 of the 10th groove in the second circle flat wire 120b is the same as the cross-line segment 132 connecting the second layer flat wire 122 of the 2nd groove and the third layer flat wire 123 of the 11th groove.

[0112] In one embodiment, each group of flat wires 1201 of the first circle of flat wires 120a further includes a second layer of flat wires 122, and one second layer of flat wires 122 is arranged adjacent to one first layer of flat wires 121 along the radial direction R of the flat wire motor, and each group of flat wires 1201 of the second circle of flat wires 120b includes a third layer of flat wires 123, and one third layer of flat wires 123 of the second circle of flat wires 120b is arranged adjacent to one second layer of flat wires 122 of the first circle of flat wires 120a along the radial direction R of the flat wire motor. Each second layer of flat wires 122 of the first circle of flat wires 120a is connected to one third layer of flat wires 123 of each group of flat wires 1201 of the second circle of flat wires 120b through the same type of cross-wire segment 132.

[0113] In the embodiment of the present application, each second-layer flat wire 122 of the first circle of flat wire 120a is connected to a third-layer flat wire of each group of flat wires 1201 of the second circle of flat wire 120b through the same cross-line segment 132, so that the routing of the winding is more regular, which is beneficial to making the structure of each parallel branch symmetrical and avoiding the generation of circulating current.

[0114] like Figure 5 , Figure 6 , Figure 8 and Fig. 9 As shown, the cross-line segment 132 connecting the second layer of flat wire 122 in the 1st slot of the first circle of flat wire 120a and the third layer of flat wire 123 in the 9th slot of the second circle of flat wire 120b, the cross-line segment 132 connecting the second layer of flat wire 122 in the 2nd slot of the first circle of flat wire 120a and the third layer of flat wire 123 in the 10th slot of the second circle of flat wire 120b, and the cross-line segment 132 connecting the second layer of flat wire 122 in the 3rd slot of the first circle of flat wire 120a and the third layer of flat wire 123 in the 11th slot of the second circle of flat wire 120b belong to the same type of cross-line segment 132, and the number of slots of the winding slots 110 crossed by the three cross-line segments 132 is 8.

[0115] In one embodiment, the number of winding slots 110 spanned by a cross-wire segment 132 connected to each second-layer flat wire 122 of the first circle of flat wire 120a is different from the number of winding slots 110 spanned by a cross-wire segment 132 connected to each first-layer flat wire 121 of the first circle of flat wire 120a.

[0116] In the embodiment of the present application, the number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to each second-layer flat wire 122 of the first circle of flat wire 120a is different from the number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to each first-layer flat wire 121 of the first circle of flat wire 120a, which is beneficial for making the winding constitute a short-distance winding, thereby facilitating the weakening of the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0117] like Figure 5 , Figure 6 , Figure 8 and Fig. 9 As shown, the number of winding slots 110 crossed by a cross-line segment 132 connected to each second-layer flat wire 122 of the first circle of flat wire 120a is 8. For example, the number of winding slots 110 crossed by a cross-line segment 132 connected to the second-layer flat wire 122 of the 1st slot of the first circle of flat wire 120a and the third-layer flat wire 123 of the 9th layer of the second circle of flat wire 120b is 8. The number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to each first-layer flat wire 121 of the first circle of flat wires 120a is 7 or 10. For example, the number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to the first-layer flat wire 121 of the 1st slot and the first-layer flat wire 121 of the 11th slot of the first circle of flat wires 120a is 10, and the number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to the first-layer flat wire 121 of the 3rd slot and the first-layer flat wire 121 of the 10th slot of the first circle of flat wires 120a is 7. The number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to each second-layer flat wire 122 of the first circle of flat wires 120a is different from the number of slots of the winding slots 110 spanned by a cross-line segment 132 connected to each first-layer flat wire 121 of the first circle of flat wires 120a.

[0118] In one embodiment, each group of flat wires 1201 of the first circle of flat wires 120a further includes a second layer of flat wires 122 and a third layer of flat wires 123, and the second layer of flat wires 122 are arranged between the first layer of flat wires 121 and the third layer of flat wires 123 along the radial direction R of the flat wire motor. Among them, one second layer of flat wires 122 of each group of flat wires 1201 of the first circle of flat wires 120a is connected to one third layer of flat wires 123 of another group of flat wires 1201 of the first circle of flat wires 120a through the same cross-wire segment 132.

[0119] In the embodiment of the present application, a second-layer flat wire 122 of each group of flat wires 1201 of the first circle of flat wires 120a is connected to a third-layer flat wire 123 of another group of flat wires 1201 of the first circle of flat wires 120a through the same cross-line segment 132, which can make the routing of the winding more regular, help to make the structure of each parallel branch symmetrical, and help to avoid the generation of circulating current.

[0120] like Fig.10 and Fig.11 As shown, the cross-line segment 132 connecting the second layer of flat wire 122 of the 1st slot of the first circle flat wire 120a and the third layer of flat wire 123 of the 10th slot of the first circle flat wire 120a, the cross-line segment 132 connecting the second layer of flat wire 122 of the 2nd slot of the first circle flat wire 120a and the third layer of flat wire 123 of the 11th slot of the first circle flat wire 120a, and the cross-line segment 132 connecting the second layer of flat wire 122 of the 3rd slot of the first circle flat wire 120a and the third layer of flat wire 123 of the 12th slot of the first circle flat wire 120a belong to the same type of cross-line segment 132, and the number of slots of the winding slots 110 crossed by the three cross-line segments 132 is 9.

[0121] In one embodiment, the number of winding slots 110 spanned by a cross-wire segment 132 connected to a second-layer flat wire 122 of each group of flat wires 1201 of the first circle of flat wires 120a is different from the number of winding slots 110 spanned by a cross-wire segment 132 connected to a first-layer flat wire 121 of each group of flat wires 1201 of the first circle of flat wires 120a.

[0122] In an embodiment of the present application, the number of slots of the winding slots 110 spanned by a cross-wire segment 132 connected to a second-layer flat wire 122 of each group of flat wires 1201 of the first circle of flat wires 120a is different from the number of slots of the winding slots 110 spanned by a cross-wire segment 132 connected to a first-layer flat wire 121 of each group of flat wires 1201 of the first circle of flat wires 120a. This allows the connections between the flat wires 120 to have different spans, which is beneficial for the windings to form short-distance windings, to weaken the harmonic magnetic field of the flat wire motor 100, and to improve the NVH performance of the flat wire motor 100.

[0123] like Fig.10 and Fig.11As shown, the number of winding slots 110 crossed by a cross-line segment 132 connected to a second-layer flat wire 122 of each group of flat wires 1201 of the first circle of flat wires 120a is 9. For example, the number of winding slots 110 crossed by a cross-line segment 132 connected to the second-layer flat wire 122 of the 1st slot of the first circle of flat wires 120a and the third-layer flat wire 123 of the 10th slot of the first circle of flat wires 120a is 9. The number of winding slots 110 crossed by a crossing segment 132 connected to a first-layer flat wire 121 of each group of flat wires 1201 of the first circle of flat wires 120a is 7 or 10. For example, the number of winding slots 110 crossed by a crossing segment 132 connected to the first-layer flat wire 121 of the 1st slot and the first-layer flat wire 121 of the 11th slot of the first circle of flat wires 120a is 10, and the number of winding slots 110 crossed by a crossing segment 132 connected to the first-layer flat wire 121 of the 3rd slot and the first-layer flat wire 121 of the 10th slot of the first circle of flat wires 120a is 7. The number of winding slots 110 spanned by a cross-wire segment 132 connected to a second-layer flat wire 122 of each group of flat wires 1201 of the first circle of flat wires 120a is different from the number of winding slots 110 spanned by a cross-wire segment 132 connected to a first-layer flat wire 121 of each group of flat wires 1201 of the first circle of flat wires 120a.

[0124] In one embodiment, the three-circle flat wire 120 includes a third circle of flat wire 120c, and the first circle of flat wire 120a, the second circle of flat wire 120b and the third circle of flat wire 120c are arranged in sequence along the radial direction R of the flat wire motor, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wire 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wire 120b.

[0125] In the embodiment of the present application, the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c are arranged in sequence along the radial direction R of the flat wire motor, the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b, the number of flat wires 120 in each group of flat wires 1201 of the first circle of flat wires 120a and the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b are different, that is, the number of flat wires in each group of flat wires 1201 of the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c are not all equal, so that the connection between the flat wires 120 can have different spans, which is conducive to the winding to form a continuous short-distance winding, which is conducive to weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0126] like Figure 5 and Figure 6As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 3, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 2. The number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0127] like Figure 7 As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 2, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 1. The number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0128] like Figure 8 As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 1, the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 2, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0129] like Fig. 9 As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 4, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 2. The number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0130] like Fig.10 As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 2, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 3. The number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0131] like Fig.11 As shown, the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b is 4, and the number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is 3. The number of flat wires 120 in each group of flat wires 1201 of the third circle of flat wires 120c is different from the number of flat wires 120 in each group of flat wires 1201 of the second circle of flat wires 120b.

[0132] In one embodiment, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b, and the third circle of flat wires 120c is N, N is an even number, each group of flat wires 1201 in the third circle of flat wires 120c includes an N-th layer of flat wires 129, and the distance between the N-th layer of flat wires 129 and the axis of the flat wire motor 100 is smaller than the distance between any other flat wire 120 in the third circle of flat wires 120c except the N-th layer of flat wires 129 and the axis of the flat wire motor 100. The N-th layer of flat wires 129 in each group of flat wires 1201 in the third circle of flat wires 120c is used to connect an N-th layer of flat wires 129 in another group of flat wires 1201 in the third circle of flat wires 120c through a cross-wire segment 132. The number of winding slots 110 crossed by a cross-wire segment 132 connected to each N-th layer of flat wires 129 of a group of flat wires 1201 of the third coil of flat wires 120 c is the same.

[0133] In the embodiment of the present application, the distance between the Nth layer of flat wire 129 and the axis of the flat wire motor 100 is smaller than the distance between any other flat wire 120 in the third circle of flat wires 120c except the Nth layer of flat wire 129 and the axis of the flat wire motor 100, that is, the Nth layer of flat wire 129 in the third circle of flat wires 120c is the slot layer of the winding slot 110.

[0134] In the embodiment of the present application, the Nth layer of flat wires 129 of each group of flat wires 1201 in the third circle of flat wires 120c is used to connect an Nth layer of flat wires 129 of another group of flat wires 1201 in the third circle of flat wires 120c through a jumper segment 132, so that the Nth layer of flat wires 129 can be jumpered in the same layer.

[0135] like Figure 7 As shown, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c is N=4, and the fourth layer of flat wires 124 in the 17th slot in the third circle of flat wires 120c is used to connect the fourth layer of flat wires 124 in the 26th slot through a jumper segment 132.

[0136] like Fig. 9 and Fig.10 As shown, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c is N=8, and the eighth layer of flat wires 126 in the 17th slot in the third circle of flat wires 120c is used to connect the eighth layer of flat wires 126 in the 26th slot through a jumper segment 132.

[0137] like Fig.11As shown, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c is N=10, and the tenth layer of flat wires 127 in the 17th slot in the third circle of flat wires 120c is used to connect the tenth layer of flat wires 127 in the 26th slot through a jumper segment 132.

[0138] In the embodiment of the present application, the number of winding slots 110 crossed by a cross-wire segment 132 connected to each N-th layer of flat wires 129 of a group of flat wires 1201 of the third circle of flat wires 120c is the same, which is beneficial for making the routing of the winding more regular, and for making the structure of each parallel branch symmetrical, avoiding the generation of circulating current.

[0139] like Figure 7 , Figures 9 to 11 As shown, the number of winding slots 110 crossed by a cross-wire segment 132 connected to each N-th layer of flat wires 129 of a group of flat wires 1201 of the third circle of flat wires 120 c is 9. Figure 7 The number of winding slots 110 crossed by a cross-wire segment 132 connecting the fourth layer flat wire 124 in the 17th slot and the fourth layer flat wire 124 in the 26th slot in the third coil flat wire 120c is 9. Fig. 9 and Fig.10 The number of winding slots 110 crossed by a cross-wire segment 132 connecting the eighth layer flat wire 126 in the 17th slot and the eighth layer flat wire 126 in the 26th slot in the third coil flat wire 120c is 9. Fig.11 The number of winding slots 110 crossed by a cross-wire segment 132 connecting the tenth layer of flat wire 127 in the 17th slot and the tenth layer of flat wire 127 in the 26th slot in the third coil of flat wire 120 c is 9.

[0140] In one embodiment, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b, and the third circle of flat wires 120c is N, where N is an odd number. Each group of flat wires 1201 in the third circle of flat wires 120c includes an N-1th layer of flat wires 128 and an Nth layer of flat wires 129 arranged adjacently, and the distance between the Nth layer of flat wires 129 and the axis of the flat wire motor 100 is smaller than the distance between any other flat wire 120 in the third circle of flat wires 120c except the Nth layer of flat wires 129 and the axis of the flat wire motor 100. The N-1th layer of flat wires 128 in each group of flat wires 1201 in the third circle of flat wires 120c is used to connect an Nth layer of flat wires 129 in another group of flat wires 1201 in the third circle of flat wires 120c through a cross-wire segment 132. The number of winding slots 110 crossed by a cross-wire segment 132 connected to each (N-1)-th layer of flat wires 128 of the third coil of flat wires 120 c is the same.

[0141] In the embodiment of the present application, the distance between the Nth layer of flat wire 129 and the axis of the flat wire motor 100 is smaller than the distance between any other flat wire 120 in the third circle of flat wires 120c except the Nth layer of flat wire 129 and the axis of the flat wire motor 100, that is, the Nth layer of flat wire 129 in the third circle of flat wires 120c is the slot layer of the winding slot 110.

[0142] In the embodiment of the present application, the N-1th layer of flat wires 128 of each group of flat wires 1201 in the third circle of flat wires 120c is used to connect an Nth layer of flat wires 129 of another group of flat wires 1201 in the third circle of flat wires 120c through a cross-line segment 132. Thus, the N-1th layer of flat wires 128 can be cross-layer connected with the Nth layer of flat wires 129, which is conducive to realizing the series connection of the winding branches.

[0143] like Figure 8 As shown, the sum of the number of flat wires 120 in a group of flat wires 1201 in the first circle of flat wires 120a, the second circle of flat wires 120b and the third circle of flat wires 120c is N=5, and the fourth layer flat wire 124 in the 17th slot in the third circle of flat wires 120c is used to connect the fifth layer flat wire 125 in the 26th slot through a jumper segment 132.

[0144] In the embodiment of the present application, the number of winding slots 110 crossed by a cross-wire segment 132 connected to each N-1 layer of flat wire 128 of the third circle of flat wire 120c is the same, which is beneficial to making the winding routing more regular, and to making the structure of each parallel branch symmetrical, avoiding the generation of circulating current.

[0145] like Figure 8 As shown, the number of winding slots 110 crossed by a cross-line segment 132 connected to each N-1th layer of flat wire 128 of the third circle of flat wire 120c is 9, and the number of winding slots 110 crossed by a cross-line segment 132 connected to the fourth layer of flat wire 124 in the 17th slot and the fifth layer of flat wire 125 in the 26th slot in the third circle of flat wire 120c is 9.

[0146] In one embodiment, each circle of flat wire 120 is divided into a plurality of phase bands 140 arranged along the circumferential direction C of the flat wire motor, and each phase band 140 includes three groups of flat wires 1201. A phase band 140a of the first circle of flat wire 120a and a phase band 140b of the second circle of flat wire 120b are offset by one winding slot 110.

[0147] In the embodiment of the present application, a phase band 140a of the first circle of flat wire 120a and a phase band 140b of the second circle of flat wire 120b are offset by one winding slot 110, so that the connection between the flat wires 120 can have different spans, which is conducive to forming a short-distance winding, thereby reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor 100.

[0148] like Figure 5 and Figure 6 As shown, the first layer of flat wires 121 and the second layer of flat wires 122 of the 10th slot form a group of flat wires 1201, the first layer of flat wires 121 and the second layer of flat wires 122 of the 11th slot form a group of flat wires 1201, and the first layer of flat wires 121 and the second layer of flat wires 122 of the 12th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase band 140a of the first circle of flat wires 120a. The third layer of flat wire 123, the fourth layer of flat wire 124 and the fifth layer of flat wire 125 in the 9th slot form a group of flat wire 1201, the third layer of flat wire 123, the fourth layer of flat wire 124 and the fifth layer of flat wire 125 in the 10th slot form a group of flat wire 1201, and the third layer of flat wire 123, the fourth layer of flat wire 124 and the fifth layer of flat wire 125 in the 11th slot form a group of flat wire 1201. The above three groups of flat wires 1201 constitute a phase belt 140b of the second circle of flat wire 120b. Figure 5 and Figure 6 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0149] like Figure 7 As shown, the first layer of flat wire 121 of the 10th slot, the first layer of flat wire 121 of the 11th slot, and the first layer of flat wire 121 of the 12th slot constitute a phase band 140a of the first circle of flat wire 120a. The second layer of flat wire 122 and the third layer of flat wire 123 of the 9th slot form a group of flat wire 1201, the second layer of flat wire 122 and the third layer of flat wire 123 of the 10th slot form a group of flat wire 1201, and the second layer of flat wire 122 and the third layer of flat wire 123 of the 11th slot form a group of flat wire 1201. The above three groups of flat wires 1201 constitute a phase band 140b of the second circle of flat wire 120b. Figure 7 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0150] like Figure 8 As shown, the first layer of flat wires 121 and the second layer of flat wires 122 in the 10th slot form a group of flat wires 1201, the first layer of flat wires 121 and the second layer of flat wires 122 in the 11th slot form a group of flat wires 1201, and the first layer of flat wires 121 and the second layer of flat wires 122 in the 12th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase band 140a of the first circle of flat wires 120a. The third layer of flat wires 123 in the 9th slot, the third layer of flat wires 123 in the 10th slot, and the third layer of flat wires 123 in the 11th slot constitute a phase band 140b of the second circle of flat wires 120b. Figure 8 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0151] like Fig. 9 As shown, the first layer of flat wires 121 and the second layer of flat wires 122 of the 10th slot form a group of flat wires 1201, the first layer of flat wires 121 and the second layer of flat wires 122 of the 11th slot form a group of flat wires 1201, and the first layer of flat wires 121 and the second layer of flat wires 122 of the 12th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase band 140a of the first circle of flat wires 120a. The third layer of flat wire 123, the fourth layer of flat wire 124, the fifth layer of flat wire 125, and the sixth layer of flat wire 120 in the 9th slot form a group of flat wire 1201, the third layer of flat wire 123, the fourth layer of flat wire 124, the fifth layer of flat wire 125, and the sixth layer of flat wire 120 in the 10th slot form a group of flat wire 1201, and the third layer of flat wire 123, the fourth layer of flat wire 124, the fifth layer of flat wire 125, and the sixth layer of flat wire 120 in the 11th slot form a group of flat wire 1201. The above three groups of flat wires 1201 constitute a phase belt 140b of the second circle of flat wire 120b, from Fig. 9 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0152] like Fig.10 As shown, the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 10th slot form a group of flat wires 1201, the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 11th slot form a group of flat wires 1201, and the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 12th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase band 140a of the first circle of flat wires 120a. The fourth layer of flat wires 124 and the fifth layer of flat wires 125 in the 9th slot form a group of flat wires 1201, the fourth layer of flat wires 124 and the fifth layer of flat wires 125 in the 10th slot form a group of flat wires 1201, and the fourth layer of flat wires 124 and the fifth layer of flat wires 125 in the 11th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase belt 140b of the second circle of flat wires 120b. Fig.10 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0153] like Fig.11As shown, the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 10th slot form a group of flat wires 1201, the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 11th slot form a group of flat wires 1201, and the first layer of flat wires 121, the second layer of flat wires 122 and the third layer of flat wires 123 in the 12th slot form a group of flat wires 1201. The above three groups of flat wires 1201 constitute a phase band 140a of the first circle of flat wires 120a. The fourth layer of flat wire 124, the fifth layer of flat wire 125, the sixth layer of flat wire 120 and the seventh layer of flat wire 120 in the 9th groove form a group of flat wire 1201, the fourth layer of flat wire 124, the fifth layer of flat wire 125, the sixth layer of flat wire 120 and the seventh layer of flat wire 120 in the 10th groove form a group of flat wire 1201, and the fourth layer of flat wire 124, the fifth layer of flat wire 125, the sixth layer of flat wire 120 and the seventh layer of flat wire 120 in the 11th groove form a group of flat wire 1201. The above three groups of flat wires 1201 constitute a phase belt 140b of the second circle of flat wire 120b, Fig.11 As can be seen from the figure, a phase belt 140a of the first coil of flat wire 120a and a phase belt 140b of the second coil of flat wire 120b are offset by one winding slot 110.

[0154] In one embodiment, the flat wire motor 100 is an m-phase motor, the stator core contains Z winding slots 110, the number of stator winding poles and the number of rotor poles are 2p, p is a positive integer, and the number of slots per pole per phase is q=3, where q=Z / (2mp), and Z / 2p represents the full pitch.

[0155] In one embodiment, L layers of flat wires are arranged in each winding slot 110, L≥4, and the number of parallel branches=q or 2q.

[0156] In one embodiment, L is decomposed into the sum of three positive integers T1, T2, and T3, that is, L=T1+T2+T3, and the three positive integers T1, T2, and T3 are not all equal. The T1 layer flat wires are divided into one group, the T2 layer flat wires are divided into one group, and the T3 layer flat wires are divided into another group. The flat wires of the T2 layer are offset by one winding slot 110 relative to the flat wires of the T1 layer in a clockwise direction along the circumference, and the flat wires of the T3 layer are offset by another winding slot 110 relative to the flat wires of the T2 layer in the same circumferential direction, so that the winding achieves a short-distance effect.

[0157] In one embodiment, the number of slots of the winding slots 110 between two adjacent layers of flat wires 120 at the junction of T1 and T2 is Z / 2p-1. In one embodiment, the span of two adjacent layers of hairpin coils 130 or welding layers at the junction of T1 and T2 is Z / 2p-1. The span of two adjacent layers of hairpin coils 130 refers to the number of slots of the winding slots 110 spanned by the cross-wire segments 132 of two adjacent layers of hairpin coils 130, and is also the difference in slot numbers of the winding slots 110 where the two flat wires 120 of the hairpin coils 130 are located. The span of two adjacent layers of welding layers refers to the number of slots of the winding slots 110 spanned by the adjacent welding layers, and is also the difference in slot numbers of the winding slots 110 where the two flat wires 120 connected by the two welding segments 133 of the adjacent layers are located.

[0158] In one embodiment, the first layer of hairpin coils 130 includes two spans, which are Z / 2p+1 and Z / 2p-q+1.

[0159] In one embodiment, the span of the hairpin coils 130 between the 2nd layer to the Lth layer is Z / 2p-1 or Z / 2p.

[0160] In one embodiment, the welding layer span between the 2nd layer to the Lth layer is Z / 2p-1 or Z / 2p.

[0161] In one embodiment, when L is an even number, the Lth layer is a same-layer hairpin coil 130, and the span is Z / 2p. When L is an odd number, the Lth layer is a same-layer welding layer, and the welding span is Z / 2p.

[0162] In one embodiment, the total hairpin coil 130 type is 2+floor (L / 2).

[0163] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Y-type manner, such as Fig.12 shown.

[0164] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Δ-type manner, such as Fig.13 shown.

[0165] In the embodiment of the present application, the stator winding arrangement is applicable to both L=even-numbered-layer windings and L=odd-numbered-layer windings, which broadens the flexibility of winding design. Multi-turn flat wire groups are staggered by one winding slot, which is equivalent to a continuous short distance, and can simultaneously weaken the 6k±1 (k=1 or 2) harmonics of the winding, thereby improving the NVH performance. The flat wires in each parallel sub-winding of each phase are evenly distributed in different layers of each winding slot, and the back electromotive force and current of each parallel sub-winding are exactly the same, which eliminates the additional copper loss of the winding circulation caused by the parallel connection of the windings, ensures the uniformity of the winding temperature, and thus improves the life of the motor. The three-phase lead wires are located at the same layer at the bottom of the slot, and the branch lead wires are located at adjacent layers, which can make full use of the radial space, simplify the Busbar structure, and reduce the end height. The hairpin coils on each layer are independent of each other, and there are no additional cross-layer hairpin coils. Fully automated wire insertion can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0166] Fig.12 is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application, Fig.13 This is another connection diagram of the three-phase winding ends provided in an embodiment of the present application.

[0167] In one embodiment, a three-phase flat wire motor has a stator winding divided into a U phase, a V phase, and a W phase, and the number of parallel branches arranged in each phase winding is 3. Fig.12 As shown, the three-phase windings of the stator winding are respectively composed of three parallel circuits, the three parallel branches of the U-phase winding are marked as U1, U2 and U3, the three parallel branches of the V-phase winding are marked as V1, V2 and V3, and the three parallel branches of the W-phase winding are marked as W1, W2 and W3. The ends of the U-phase, V-phase and W-phase are connected in a Y-type manner. In another embodiment, as Fig.13 As shown, the three-phase windings of the stator winding are respectively composed of three parallel circuits, and the ends of the U phase, V phase and W phase are connected in a Δ type.

[0168] The following will describe in detail the connection method of the specific parallel branches in the embodiment of the present application in combination with specific embodiments.

[0169] The winding structure is described as follows: "-" represents the current flowing into the flat wire, "+" represents the current flowing out of the flat wire, U1 represents the first parallel branch, U 1in Represents the first lead-out line of the first parallel branch, U 1out U represents the tail lead of the first parallel branch. U2 represents the second parallel branch. 2in Represents the first lead of the second parallel branch, U 2out U represents the tail lead of the second parallel branch, and U3 represents the third parallel branch U 3in Represents the first lead of the second parallel branch, U 3outRepresents the tail lead of the second parallel branch. It should be noted that Figures 5 to 11 The phase band distribution in the figure is only for illustration. Figures 5 to 11 The "+" and "-" symbols in Figures 5 to 11 The "U+" in the figure is changed to "U-", and the "U-" is changed to "U+", and the V phase and W phase are also modified accordingly, all of which are within the protection scope of this application.

[0170] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=7, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Figure 5 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0171] like Figure 5 and Figure 3 As shown, each winding slot contains 7 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3, the fourth layer is marked as L4, the fifth layer is marked as L5, the sixth layer is marked as L6, and the seventh layer is marked as L7. The first layer is the bottom layer of the winding slot, and the seventh layer is the slot opening layer.

[0172] Figure 5 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 7, L = T1 + T2 + T3, T1, T2, T3 are 2, 3, 2 respectively, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th layer of flat wires, T3 contains the 6th / 7th layer of flat wires, the 1st / 2nd layer of flat wires, the 3rd / 4th / 5th layer of flat wires, and the 6th / 7th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0173] Lead wire at the first end (i.e. U in ) is led out from the first layer of slots 28, 29, and 30, and the tail lead wire (i.e. U out ) is led out from the first layer of the 19th, 20th and 21st slots. In addition, the first layer of the 19th, 20th, 21st, 28th, 29th and 30th slots use Ipin hairpin wires. The hairpin coils on the same layer of the first layer contain two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The hairpin coils between the 2nd and 7th layers have two spans, which are Z / 2p-1=8 and Z / 2p=9 respectively. There are two spans of the welding layer between the 2nd and 7th layers, which are Z / 2p-1=8 and Z / 2p=9 respectively. The welding layer on the same layer of the 7th layer has only one span, which is Z / 2p=9.

[0174] The total number of hairpin coil types is 2+floor(L / 2)=5.

[0175] like Figure 5 As shown, the T1 layer flat wire, the T2 layer flat wire and the T3 layer flat wire respectively include different phase bands, each phase band includes three adjacently arranged winding slots, the phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire, and the phase band of the T3 layer flat wire is offset by one winding slot relative to the phase band of the T2 layer flat wire. For example, in the T1 layer flat wire, the 1 / 2 layer flat wires in the 10th slot, the 11th slot and the 12th slot are one phase band, in the T2 layer flat wire, the 3 / 4 / 5 layer flat wires in the 9th slot, the 10th slot and the 11th slot are one phase band, and in the T3 layer flat wire, the 6 / 7 layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase band. All the 1 / 2 layer flat wires constitute the first circle flat wire 120a, all the 3 / 4 / 5 layer flat wires constitute the second circle flat wire 120b, and all the 6 / 7 layer flat wires constitute the third circle flat wire 120c.

[0176] like Figure 5 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0177] Combine the following Figure 5 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Figure 5 The dotted line connection method shows the connection method of the stator winding at the welding end. The solid line connection method of the crown end of the stator winding can refer to the connection method.

[0178] like Figure 5 As shown, the first parallel branch of the U-phase winding uses the first layer of the 30th slot as the incoming line terminal U 1in , enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 39th slot, then enter from the 3rd layer of the 47th slot, exit from the 4th layer of the 2nd slot, then enter from the 5th layer of the 11th slot, exit from the 6th layer of the 19th slot, then enter from the 7th layer of the 28th slot, and exit from the 7th layer of the 37th slot. At this point, the flat wire can be connected to complete the first traversal from the 1st layer to the 7th layer.

[0179] Then enter from the 6th floor of the 28th slot, exit from the 5th floor of the 20th slot, then enter from the 4th floor of the 11th slot, exit from the 3rd floor of the 2nd slot, then enter from the 2nd floor of the 48th slot, exit from the 1st floor of the 39th slot, then enter from the 1st floor of the 46th slot, exit from the 2nd floor of the 1st slot, then enter from the 3rd floor of the 9th slot, exit from the 4th floor of the 18th slot, then enter from the 5th floor of the 27th slot, exit from the 6th floor of the 35th slot, then enter from the 7th floor of the 44th slot, exit from the 7th floor of the 53rd slot, thus completing the second traversal.

[0180] Then enter from the 6th floor of the 44th slot, exit from the 5th floor of the 36th slot, then enter from the 4th floor of the 27th slot, exit from the 3rd floor of the 18th slot, then enter from the 2nd floor of the 10th slot, exit from the 1st floor of the 1st slot, then enter from the 1st floor of the 11th slot, exit from the 2nd floor of the 20th slot, then enter from the 3rd floor of the 28th slot, exit from the 4th floor of the 37th slot, then enter from the 5th floor of the 46th slot, exit from the 6th floor of the 54th slot, then enter from the 7th floor of the 9th slot, exit from the 7th floor of the 18th slot, thus completing the third traversal.

[0181] Then it enters from the 6th layer of the 9th slot, exits from the 5th layer of the 1st slot, then enters from the 4th layer of the 46th slot, exits from the 3rd layer of the 37th slot, then enters from the 2nd layer of the 29th slot, exits from the 1st layer of the 20th slot, and finally exits from the 1st layer of the 20th slot, forming the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0182] It should be noted that in the above connection methods, for example, "entering from the first layer of the 30th slot" means connecting the flat wire of the first layer of the 30th slot at the welding end, and "leading out from the first layer of the 20th slot" means connecting the flat wire of the first layer of the 20th slot at the welding end.

[0183] The second parallel branch of the U phase winding uses the first layer of the 28th slot as the incoming line terminal U 2in , enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 37th slot, then enter from the 3rd layer of the 45th slot, exit from the 4th layer of the 54th slot, then enter from the 5th layer of the 9th slot, exit from the 6th layer of the 17th slot, then enter from the 7th layer of the 26th slot, and exit from the 7th layer of the 35th slot. At this point, the flat wire can be connected to complete the first traversal from the 1st layer to the 7th layer.

[0184] Then enter from the 6th floor of the 26th slot, exit from the 5th floor of the 18th slot, then enter from the 4th floor of the 9th slot, exit from the 3rd floor of the 54th slot, then enter from the 2nd floor of the 46th slot, exit from the 1st floor of the 37th slot, then enter from the 1st floor of the 47th slot, exit from the 2nd floor of the 2nd slot, then enter from the 3rd floor of the 10th slot, exit from the 4th floor of the 19th slot, then enter from the 5th floor of the 28th slot, exit from the 6th floor of the 36th slot, then enter from the 7th floor of the 45th slot, exit from the 7th floor of the 54th slot, thus completing the second traversal.

[0185] Then enter from the 6th floor of the 45th slot, exit from the 5th floor of the 37th slot, then enter from the 4th floor of the 28th slot, exit from the 3rd floor of the 19th slot, then enter from the 2nd floor of the 11th slot, exit from the 1st floor of the 2nd slot, then enter from the 1st floor of the 12th slot, exit from the 2nd floor of the 21st slot, then enter from the 3rd floor of the 29th slot, exit from the 4th floor of the 38th slot, then enter from the 5th floor of the 47th slot, exit from the 6th floor of the 1st slot, then enter from the 7th floor of the 10th slot, exit from the 7th floor of the 19th slot, thus completing the third traversal.

[0186] Then it enters from the 6th layer of the 10th slot, exits from the 5th layer of the 2nd slot, then enters from the 4th layer of the 47th slot, exits from the 3rd layer of the 38th slot, then enters from the 2nd layer of the 30th slot, exits from the 1st layer of the 21st slot, and finally leads out from the 1st layer of the 21st slot, forming the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0187] It should be noted that in the above connection methods, for example, "entering from the first layer of the 28th slot" means connecting the flat wire of the first layer of the 28th slot at the welding end, and "leading out from the first layer of the 21st slot" means connecting the flat wire of the first layer of the 21st slot at the welding end.

[0188] The third parallel branch of the U phase winding uses the first layer of the 29th slot as the incoming line terminal U 3in , enter from the 1st layer of the 29th slot, exit from the 2nd layer of the 38th slot, then enter from the 3rd layer of the 46th slot, exit from the 4th layer of the 1st slot, then enter from the 5th layer of the 10th slot, exit from the 6th layer of the 18th slot, then enter from the 7th layer of the 27th slot, and exit from the 7th layer of the 36th slot. At this point, the flat wire can be connected to complete the first traversal from the 1st layer to the 7th layer.

[0189] Then enter from the 6th floor of the 27th slot, exit from the 5th floor of the 19th slot, then enter from the 4th floor of the 10th slot, exit from the 3rd floor of the 1st slot, then enter from the 2nd floor of the 47th slot, exit from the 1st floor of the 38th slot, then enter from the 1st floor of the 48th slot, exit from the 2nd floor of the 3rd slot, then enter from the 3rd floor of the 11th slot, exit from the 4th floor of the 20th slot, then enter from the 5th floor of the 29th slot, exit from the 6th floor of the 37th slot, then enter from the 7th floor of the 46th slot, exit from the 7th floor of the 1st slot, and complete the second traversal.

[0190] Then enter from the 6th floor of the 46th slot, exit from the 5th floor of the 38th slot, then enter from the 4th floor of the 29th slot, exit from the 3rd floor of the 20th slot, then enter from the 2nd floor of the 12th slot, exit from the 1st floor of the 3rd slot, then enter from the 10th slot, exit from the 2nd floor of the 19th slot, then enter from the 3rd floor of the 27th slot, exit from the 4th floor of the 36th slot, then enter from the 5th floor of the 45th slot, exit from the 6th floor of the 53rd slot, then enter from the 7th floor of the 8th slot, exit from the 7th floor of the 17th slot. At this point, the third traversal is completed.

[0191] Then it enters from the 6th layer of the 8th slot, exits from the 5th layer of the 54th slot, then enters from the 4th layer of the 45th slot, exits from the 3rd layer of the 36th slot, then enters from the 2nd layer of the 28th slot, exits from the 1st layer of the 19th slot, and finally exits from the 1st layer of the 19th slot, forming the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0192] It should be noted that in the above connection methods, for example, "entering from the first layer of the 29th slot" means connecting the flat wire of the first layer of the 29th slot at the welding end, and "leading out from the first layer of the 19th slot" means connecting the flat wire of the first layer of the 19th slot at the welding end.

[0193] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 5 The connection method of the second branch of the V phase and the second branch of the W phase is Figure 5 The connection method of the third branch of the V phase and the third branch of the W phase is Figure 5 It can be obtained by translating based on the third branch of the U phase.

[0194] Fig.14 1 is a schematic structural diagram of the crown end 132a of the motor stator 101 in the first embodiment of the present application. Fig.15 It is a schematic structural diagram of the welding end 133a of the motor stator 101 in the first embodiment of the present application.

[0195] like Fig.14 and Fig.15 As shown, this application Figure 5 The winding arrangement in the first embodiment shown is regular, the lead wires of each phase are all at the crown end 132a and are all in the first layer, and the lead wires of each phase branch are located in adjacent winding slots 110, thereby simplifying the busbar structure design.

[0196] Table 1 is a comparison table of the harmonic winding coefficients of the first embodiment of the present application, conventional full-pitch windings, and traditional short-pitch windings.

[0197]

[0198] As shown in Table 1, the 1st harmonic is the fundamental wave. The 5th, 7th, 11th and 13th harmonic winding coefficients of the conventional short-pitch winding with a pitch of 8 are 0.1399, 0.0607, 0.0607 and 0.1399 respectively, while the present application Figure 5 In the embodiment 1 shown, the 5th, 7th, 11th and 13th harmonic winding coefficients of the continuous short-distance winding are 0.0717, 0.0016, 0.0016 and 0.0717 respectively. Figure 5 The 5th, 7th, 11th, and 13th harmonic winding coefficients in the first embodiment shown are much lower than those of the traditional short-pitch winding with a pitch of 8, and have a stronger weakening effect on the 5th, 7th, and 11th harmonics of the armature side magnetic field. Moreover, the fundamental wave coefficient of 0.9276 is not much lower than 0.9598 of the full-pitch winding, and is relatively close.

[0199] As shown in Table 1, this application Figure 5 In the embodiment shown in the first embodiment, the 7th and 11th harmonic winding coefficients of the continuous short-pitch winding are 0.0016, the pitch is 7, and the 7th and 11th harmonic winding coefficients of the traditional short-pitch winding are 0.1359. Figure 5 The 7th and 11th harmonic winding coefficients of the continuous short-pitch winding in the first embodiment of the application shown are much lower than the conventional short-pitch winding with a pitch of 7. Figure 5 The 5th and 13th harmonic winding coefficients of the continuous short-pitch winding in the first embodiment shown are 0.0717, which are slightly higher than 0.0378 of the conventional short-pitch winding with a pitch of 7. Figure 5 The fundamental wave winding coefficient in the first embodiment shown is 0.9276, which is higher than 0.9019 of the traditional short pitch winding with a pitch of 7, reducing the impact of the short pitch on the average torque and having the advantage of weakening high-order harmonics without weakening the fundamental wave.

[0200] Fig.16 This is a torque pulsation comparison diagram of the peak operating point of the winding in the first embodiment of the present application. The horizontal axis represents the electrical angle, and the vertical axis represents the torque.

[0201] like Fig.16 As shown, curve A represents the torque waveform of the continuous short-pitch winding in Example 1, curve B represents the torque waveform of the traditional short-pitch winding, and curve C represents the torque waveform of the full-pitch winding. The peak-to-peak torque value of the full-pitch winding can reach 430Nm, and the trough value can be close to 413Nm, with a large torque pulsation. Figure 5 The torque pulsation of the operating point of the continuous short-distance winding and the traditional short-distance winding in the embodiment 1 shown is between 413Nm and 425Nm. Figure 5 The torque pulsation at the peak torque operating point of the first embodiment shown is smaller than that of the traditional full-pitch winding and the traditional short-pitch winding.

[0202] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=7, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Figure 6 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0203] like Figure 6 and Figure 3 As shown, each winding slot contains 7 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3, the fourth layer is marked as L4, the fifth layer is marked as L5, the sixth layer is marked as L6 and the seventh layer is marked as L7. The first layer is the bottom layer of the winding slot, and the seventh layer is the slot opening layer.

[0204] Figure 6 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 7, L = T1 + T2 + T3, T1, T2, T3 are 2, 3, 2 respectively, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th layer of flat wires, T3 contains the 6th / 7th layer of flat wires, the 1st / 2nd layer of flat wires, the 3rd / 4th / 5th layer of flat wires, and the 6th / 7th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0205] The difference from the first embodiment is Figure 6 In the second embodiment shown, the outlet terminal is arranged at the welding terminal.

[0206] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The hairpin coils on the same layer of the 1st layer contain two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The hairpin coils between the 2nd to 7th layers have two spans, which are Z / 2p-1=8 and Z / 2p=9 respectively. There are two welding spans between the 2nd to 7th layers, which are Z / 2p-1=8 and Z / 2p=9 respectively. The welding on the same layer of the 7th layer has only one span, which is Z / 2p=9.

[0207] The total number of hairpin coil types is 2+floor(L / 2)=5.

[0208] like Figure 6 As shown, Figure 5 Similarly, the T1 layer flat wire, the T2 layer flat wire and the T3 layer flat wire respectively include different phase bands, and the 1st / 2nd / 3rd / 4th / 5th / 6th / 7th layer flat wires respectively constitute the first circle flat wire 120a, the second circle flat wire 120b and the third circle flat wire 120c.

[0209] like Figure 6 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0210] Combine the following Figure 6 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Figure 6 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0211] like Figure 6 As shown, the first parallel branch of the U-phase winding uses the second layer of the first slot as the incoming line terminal U 1in , enter from the 2nd floor of the 1st slot, exit from the 3rd floor of the 9th slot, then enter from the 4th floor of the 18th slot, exit from the 5th floor of the 27th slot, then enter from the 6th floor of the 35th slot, exit from the 7th floor of the 44th slot, then enter from the 7th floor of the 53rd slot, exit from the 6th floor of the 44th slot, then enter from the 5th floor of the 36th slot, exit from the 4th floor of the 27th slot, then enter from the 3rd floor of the 18th slot, exit from the 2nd floor of the 10th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 7th floor.

[0212] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 37th slot, exit from the 5th floor of the 46th slot, then enter from the 6th floor of the 54th slot, exit from the 7th floor of the 9th slot, then enter from the 7th floor of the 18th slot, exit from the 6th floor of the 9th slot, then enter from the 5th floor of the 1st slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 37th slot, exit from the 29th slot, then enter from the 1st floor of the 20th slot, and exit from the 1st floor of the 30th slot. At this point, the second traversal is completed.

[0213] Then enter from the 2nd layer of the 39th slot, exit from the 3rd layer of the 47th slot, then enter from the 4th layer of the 2nd slot, exit from the 5th layer of the 11th slot, then enter from the 6th layer of the 19th slot, exit from the 7th layer of the 28th slot, then enter from the 7th layer of the 37th slot, exit from the 6th layer of the 28th slot, then enter from the 5th layer of the 20th slot, exit from the 4th layer of the 11th slot, then enter from the 3rd layer of the 2nd slot, exit from the 2nd layer of the 48th slot, then enter from the 1st layer of the 39th slot, exit from the 1st layer of the 46th slot, and thus lead out from the 1st layer of the 46th slot to form the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0214] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 46th groove" means connecting the flat wire of the first layer of the 46th groove at the crown end.

[0215] The second parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 2in , enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 10th slot, then enter from the 4th floor of the 19th slot, exit from the 5th floor of the 28th slot, then enter from the 6th floor of the 36th slot, exit from the 7th floor of the 45th slot, then enter from the 7th floor of the 54th slot, exit from the 6th floor of the 45th slot, then enter from the 5th floor of the 37th slot, exit from the 4th floor of the 28th slot, then enter from the 3rd floor of the 19th slot, exit from the 2nd floor of the 11th slot, then enter from the 1st floor of the 2nd slot, and exit from the 1st floor of the 12th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 7th floor.

[0216] Then enter from the 2nd floor of the 21st slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 38th slot, exit from the 5th floor of the 47th slot, then enter from the 6th floor of the 1st slot, exit from the 7th floor of the 10th slot, then enter from the 7th floor of the 19th slot, exit from the 6th floor of the 10th slot, then enter from the 5th floor of the 2nd slot, exit from the 4th floor of the 47th slot, then enter from the 3rd floor of the 38th slot, exit from the 2nd floor of the 30th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot, thus completing the second traversal.

[0217] Then enter from the 2nd layer of the 37th slot, exit from the 3rd layer of the 45th slot, then enter from the 4th layer of the 54th slot, exit from the 5th layer of the 9th slot, then enter from the 6th layer of the 17th slot, exit from the 7th layer of the 26th slot, then enter from the 7th layer of the 35th slot, exit from the 6th layer of the 26th slot, then enter from the 5th layer of the 18th slot, exit from the 4th layer of the 9th slot, then enter from the 3rd layer of the 54th slot, exit from the 2nd layer of the 46th slot, then enter from the 1st layer of the 37th slot, exit from the 1st layer of the 47th slot, and thus lead out from the 1st layer of the 47th slot to form the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0218] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0219] The third parallel branch of the U phase winding uses the second layer of the third slot as the incoming line terminal U 3in, enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 11th slot, then enter from the 4th floor of the 20th slot, exit from the 5th floor of the 29th slot, then enter from the 6th floor of the 37th slot, exit from the 7th floor of the 46th slot, then enter from the 7th floor of the 1st slot, exit from the 6th floor of the 46th slot, then enter from the 5th floor of the 38th slot, exit from the 4th floor of the 29th slot, then enter from the 3rd floor of the 20th slot, exit from the 2nd floor of the 12th slot, then enter from the 1st floor of the 3rd slot, and exit from the 1st floor of the 10th slot. At this point, the flat wire can be connected to complete the first traversal from the 1st floor to the 7th floor.

[0220] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 36th slot, exit from the 5th floor of the 45th slot, then enter from the 6th floor of the 53rd slot, exit from the 7th floor of the 8th slot, then enter from the 7th floor of the 17th slot, exit from the 6th floor of the 8th slot, then enter from the 5th floor of the 54th slot, exit from the 4th floor of the 45th slot, then enter from the 3rd floor of the 36th slot, exit from the 2nd floor of the 28th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot, thus completing the second traversal.

[0221] Then enter from the 2nd layer of the 38th slot, exit from the 3rd layer of the 46th slot, then enter from the 4th layer of the 1st slot, exit from the 5th layer of the 10th slot, then enter from the 6th layer of the 18th slot, exit from the 7th layer of the 27th slot, then enter from the 7th layer of the 36th slot, exit from the 6th layer of the 27th slot, then enter from the 5th layer of the 19th slot, exit from the 4th layer of the 10th slot, then enter from the 3rd layer of the 1st slot, exit from the 2nd layer of the 47th slot, then enter from the 1st layer of the 38th slot, exit from the 1st layer of the 48th slot, and thus lead out from the 1st layer of the 48th slot to form the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0222] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 3rd groove" means connecting the flat wire of the 2nd layer of the 3rd groove at the welding end, and "leading out from the 1st layer of the 48th groove" means connecting the flat wire of the 1st layer of the 48th groove at the crown end.

[0223] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 6 The connection method of the second branch of the V phase and the second branch of the W phase is Figure 6 The connection method of the third branch of the V phase and the third branch of the W phase is Figure 6 It can be obtained by translating based on the third branch of the U phase.

[0224] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=4, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Figure 7 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0225] like Figure 7 As shown, each winding slot contains 4 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3 and the fourth layer is marked as L4. The first layer is the bottom layer of the winding slot, and the fourth layer is the slot opening layer.

[0226] Figure 7 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 4, L = T1 + T2 + T3, T1, T2, T3 are 1, 2, 1 respectively, T1 contains the first layer of flat wires, T2 contains the second / third layer of flat wires, T3 contains the fourth layer of flat wires, the first layer of flat wires, the second / third layer of flat wires, and the fourth layer of flat wires are staggered by one winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0227] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The first layer of the hairpin coil contains two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The 4th layer is the hairpin coil on the same layer, with only one span, which is Z / 2p=9. The hairpin coils between the 2nd and 4th layers only contain one span, which is Z / 2p=9. The welding layer between the 2nd and 4th layers only contains one span, which is Z / 2p-1=8.

[0228] The total number of hairpin coil types is 2+floor(L / 2)=4.

[0229] like Figure 7As shown, the T1-layer flat wire, the T2-layer flat wire and the T3-layer flat wire respectively include different phase bands, each phase band includes three adjacently arranged winding slots, the phase band of the T2-layer flat wire is offset by one winding slot relative to the phase band of the T1-layer flat wire, and the phase band of the T3-layer flat wire is offset by one winding slot relative to the phase band of the T2-layer flat wire. For example, in the T1-layer flat wire, the first-layer flat wires in the 10th slot, the 11th slot and the 12th slot are one phase band, in the T2-layer flat wire, the second / third-layer flat wires in the 9th slot, the 10th slot and the 11th slot are one phase band, and in the T3-layer flat wire, the fourth-layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase band. All the first-layer flat wires constitute the first circle of flat wires 120a, all the second / third-layer flat wires constitute the second circle of flat wires 120b, and all the fourth-layer flat wires constitute the third circle of flat wires 120c.

[0230] like Figure 7 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0231] Combine the following Figure 7 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Figure 7 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0232] like Figure 7 As shown, the first parallel branch of the U phase winding uses the second layer of the 54th slot as the incoming line terminal U 1in , enter from the 2nd floor of the 54th slot, exit from the 3rd floor of the 9th slot, then enter from the 4th floor of the 17th slot, exit from the 4th floor of the 26th slot, then enter from the 3rd floor of the 18th slot, exit from the 2nd floor of the 9th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 4th floor.

[0233] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 36th slot, exit from the 45th slot, then enter from the 3rd floor of the 37th slot, exit from the 2nd floor of the 28th slot, then enter from the 1st floor of the 20th slot, exit from the 1st floor of the 30th slot, and the second traversal is completed.

[0234] Then it enters from the second layer of the 38th slot, exits from the third layer of the 47th slot, then enters from the fourth layer of the 1st slot, exits from the fourth layer of the 10th slot, then enters from the third layer of the 2nd slot, exits from the second layer of the 47th slot, then enters from the first layer of the 39th slot, exits from the first layer of the 46th slot, and finally exits from the first layer of the 46th slot, forming the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0235] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 54th slot" means connecting the flat wire of the 2nd layer of the 54th slot at the welding end, and "leading out from the 1st layer of the 46th slot" means connecting the flat wire of the 1st layer of the 46th slot at the crown end.

[0236] The second parallel branch of the U phase winding uses the second layer of the first slot as the incoming line terminal U 2in , enter from the 2nd layer of the 1st slot, exit from the 3rd layer of the 10th slot, then enter from the 4th layer of the 18th slot, exit from the 4th layer of the 27th slot, then enter from the 3rd layer of the 19th slot, exit from the 2nd layer of the 10th slot, then enter from the 1st layer of the 2nd slot, and exit from the 1st layer of the 12th slot. At this point, the flat wire is connected and the first traversal can be completed from the 1st layer to the 4th layer.

[0237] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 37th slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 38th slot, exit from the 2nd floor of the 29th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot, and the second traversal is completed.

[0238] Then it enters from the second layer of the 36th slot, exits from the third layer of the 45th slot, then enters from the fourth layer of the 53rd slot, exits from the fourth layer of the 8th slot, then enters from the third layer of the 54th slot, exits from the second layer of the 45th slot, then enters from the first layer of the 37th slot, exits from the first layer of the 48th slot, and finally exits from the first layer of the 48th slot, forming the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0239] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 48th groove" means connecting the flat wire of the first layer of the 48th groove at the crown end.

[0240] The third parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 3in , enter from the 2nd layer of the 2nd slot, exit from the 3rd layer of the 11th slot, then enter from the 4th layer of the 19th slot, exit from the 4th layer of the 28th slot, then enter from the 3rd layer of the 20th slot, exit from the 2nd layer of the 11th slot, then enter from the 1st layer of the 3rd slot, and exit from the 1st layer of the 10th slot. At this point, the flat wire is connected to complete the first traversal from the 1st layer to the 4th layer.

[0241] Then enter from the 2nd floor of the 18th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 35th slot, exit from the 44th slot, then enter from the 3rd floor of the 36th slot, exit from the 2nd floor of the 27th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot, and the second traversal is completed.

[0242] Then it enters from the second layer of the 37th slot, exits from the third layer of the 46th slot, then enters from the fourth layer of the 54th slot, exits from the fourth layer of the 9th slot, then enters from the third layer of the 1st slot, exits from the second layer of the 46th slot, then enters from the first layer of the 38th slot, exits from the first layer of the 47th slot, and finally exits from the first layer of the 47th slot, forming the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0243] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0244] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 7 The connection method of the second branch of the V phase and the second branch of the W phase is Figure 7 The connection method of the third branch of the V phase and the third branch of the W phase is Figure 5 It can be obtained by translating based on the third branch of the U phase.

[0245] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=5, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Figure 8 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0246] like Figure 8 As shown, each winding slot contains 5 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3, the fourth layer is marked as L4 and the fifth layer is marked as L5. The first layer is the bottom layer of the winding slot, and the fifth layer is the slot opening layer.

[0247] Figure 8Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 5, L = T1 + T2 + T3, T1, T2, T3 are 2, 1, 2 respectively, T1 contains the 1 / 2 layer of flat wires, T2 contains the 3rd layer of flat wires, T3 contains the 4 / 5th layer of flat wires, the 1 / 2 layer of flat wires, the 3rd layer of flat wires, and the 4 / 5th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0248] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The first layer of hairpin coils contains two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The 5th layer is the same welding layer, with only one span, which is Z / 2p=9. The hairpin coils between the 2nd and 5th layers contain two spans, which are Z / 2p-1=8 and Z / 2p=9 respectively. The welding layer between the 2nd and 5th layers contains two spans, which are Z / 2p-1=8 and Z / 2p=9.

[0249] The total number of hairpin coil types is 2+floor(L / 2)=4.

[0250] like Figure 8 As shown, the T1 layer flat wire, the T2 layer flat wire and the T3 layer flat wire respectively include different phase bands, each phase band includes three adjacently arranged winding slots, the phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire, and the phase band of the T3 layer flat wire is offset by one winding slot relative to the phase band of the T2 layer flat wire. For example, in the T1 layer flat wire, the 1 / 2 layer flat wires in the 10th slot, the 11th slot and the 12th slot are one phase band, in the T2 layer flat wire, the 3rd layer flat wires in the 9th slot, the 10th slot and the 11th slot are one phase band, and in the T3 layer flat wire, the 4th / 5th / 6th layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase band. All the 1 / 2 layer flat wires constitute the first circle flat wire 120a, all the 3rd layer flat wires constitute the second circle flat wire 120b, and all the 4th / 5th / 6th layer flat wires constitute the third circle flat wire 120c.

[0251] like Figure 8 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0252] Combine the following Figure 8 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Figure 8 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0253] like Figure 8As shown, the first parallel branch of the U-phase winding uses the second layer of the first slot as the incoming line terminal U 1in , enter from the 2nd floor of the 1st slot, exit from the 3rd floor of the 9th slot, then enter from the 4th floor of the 17th slot, exit from the 5th floor of the 26th slot, then enter from the 5th floor of the 35th slot, exit from the 4th floor of the 26th slot, then enter from the 3rd floor of the 18th slot, exit from the 2nd floor of the 10th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 5th floor.

[0254] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 36th slot, exit from the 5th floor of the 45th slot, then enter from the 5th floor of the 54th slot, exit from the 4th floor of the 45th slot, then enter from the 3rd floor of the 37th slot, exit from the 2nd floor of the 29th slot, then enter from the 1st floor of the 20th slot, and exit from the 1st floor of the 30th slot. At this point, the second traversal is completed.

[0255] Then it enters from the second layer of the 39th slot, exits from the third layer of the 47th slot, then enters from the fourth layer of the 1st slot, exits from the fifth layer of the 10th slot, then enters from the fifth layer of the 19th slot, exits from the fourth layer of the 10th slot, then enters from the third layer of the 2nd slot, exits from the second layer of the 48th slot, then enters from the first layer of the 39th slot, exits from the first layer of the 46th slot, and is now led out from the first layer of the 46th slot to form the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0256] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 46th groove" means connecting the flat wire of the first layer of the 46th groove at the crown end.

[0257] The second parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 2in , enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 10th slot, then enter from the 4th floor of the 18th slot, exit from the 5th floor of the 27th slot, then enter from the 5th floor of the 36th slot, exit from the 4th floor of the 27th slot, then enter from the 3rd floor of the 19th slot, exit from the 2nd floor of the 11th slot, then enter from the 1st floor of the 2nd slot, and exit from the 1st floor of the 12th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 5th floor.

[0258] Then enter from the 2nd floor of the 21st slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 37th slot, exit from the 5th floor of the 46th slot, then enter from the 5th floor of the 1st slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 38th slot, exit from the 2nd floor of the 30th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot, thus completing the second traversal.

[0259] Then it enters from the second layer of the 37th slot, exits from the third layer of the 45th slot, then enters from the fourth layer of the 53rd slot, exits from the fifth layer of the 8th slot, then enters from the fifth layer of the 17th slot, exits from the fourth layer of the 8th slot, then enters from the third layer of the 54th slot, exits from the second layer of the 46th slot, then enters from the first layer of the 37th slot, exits from the first layer of the 47th slot, and is now led out from the first layer of the 47th slot to form the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0260] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0261] The third parallel branch of the U phase winding uses the second layer of the third slot as the incoming line terminal U 3in , enter from the 2nd floor of the 3rd slot, exit from the 3rd floor of the 11th slot, then enter from the 4th floor of the 19th slot, exit from the 5th floor of the 28th slot, then enter from the 5th floor of the 37th slot, exit from the 4th floor of the 28th slot, then enter from the 3rd floor of the 20th slot, exit from the 2nd floor of the 12th slot, then enter from the 1st floor of the 3rd slot, and exit from the 1st floor of the 10th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 5th floor.

[0262] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 35th slot, exit from the 5th floor of the 44th slot, then enter from the 5th floor of the 53rd slot, exit from the 4th floor of the 44th slot, then enter from the 3rd floor of the 36th slot, exit from the 2nd floor of the 28th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot, thus completing the second traversal.

[0263] Then it enters from the second layer of the 38th slot, exits from the third layer of the 46th slot, then enters from the fourth layer of the 54th slot, exits from the fifth layer of the 9th slot, then enters from the fifth layer of the 18th slot, exits from the fourth layer of the 9th slot, then enters from the third layer of the 1st slot, exits from the second layer of the 47th slot, then enters from the first layer of the 38th slot, exits from the first layer of the 48th slot, and is led out from the first layer of the 48th slot to form the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0264] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 3rd groove" means connecting the flat wire of the 2nd layer of the 3rd groove at the welding end, and "leading out from the 1st layer of the 48th groove" means connecting the flat wire of the 1st layer of the 48th groove at the crown end.

[0265] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 8 The connection method of the second branch of the V phase and the second branch of the W phase is Figure 8 The connection method of the third branch of the V phase and the third branch of the W phase is Figure 8 It can be obtained by translating based on the third branch of the U phase.

[0266] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=8, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Fig. 9 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0267] like Fig. 9 As shown, each winding slot contains 8 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3, the fourth layer is marked as L4, the fifth layer is marked as L5, the sixth layer is marked as L6, the seventh layer is marked as L7, and the eighth layer is marked as L8. The first layer is the bottom layer of the winding slot, and the eighth layer is the slot opening layer.

[0268] Fig. 9 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 8, L = T1 + T2 + T3, T1, T2, T3 are 2, 4, 2 respectively, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th / 6th layer of flat wires, T3 contains the 7th / 8th layer of flat wires, the 1st / 2nd layer of flat wires, the 3rd / 4th / 5th / 6th layer of flat wires, and the 7th / 8th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0269] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The first layer of hairpin coils contains two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The 8th layer is the hairpin coil on the same layer, with only one span, which is Z / 2p=9. The hairpin coils between the 2nd and 8th layers contain two spans, which are Z / 2p-1=8 and Z / 2p=9 respectively. The welding layer between the 2nd and 8th layers contains only one span, which is Z / 2p=9.

[0270] The total number of hairpin coil types is 2+floor(L / 2)=6.

[0271] like Fig. 9 As shown, the T1-layer flat wire, the T2-layer flat wire and the T3-layer flat wire respectively include different phase belts, each phase belt includes three winding slots arranged adjacently, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, and the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire. For example, in the T1-layer flat wire, the 1 / 2-layer flat wires in the 10th slot, the 11th slot and the 12th slot are one phase belt, in the T2-layer flat wire, the 3 / 4 / 5 / 6-layer flat wires in the 9th slot, the 10th slot and the 11th slot are one phase belt, and in the T3-layer flat wire, the 7 / 8-layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase belt. All the flat wires in the 1st / 2nd layer form a first circle of flat wires 120a, all the flat wires in the 3rd / 4th / 5th / 6th layer form a second circle of flat wires 120b, and all the flat wires in the 7th / 8th layer form a third circle of flat wires 120c.

[0272] like Fig. 9 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0273] Combine the following Fig. 9 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Fig. 9 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0274] like Fig. 9 As shown, the first parallel branch of the U-phase winding uses the second layer of the first slot as the incoming line terminal U 1in, enter from the 2nd floor of the 1st slot, exit from the 3rd floor of the 9th slot, then enter from the 4th floor of the 18th slot, exit from the 5th floor of the 27th slot, then enter from the 6th floor of the 36th slot, exit from the 7th floor of the 44th slot, then enter from the 8th floor of the 53rd slot, exit from the 8th floor of the 8th slot, then enter from the 7th floor of the 53rd slot, exit from the 6th floor of the 45th slot, then enter from the 5th floor of the 36th slot, exit from the 4th floor of the 27th slot, then enter from the 3rd floor of the 18th slot, exit from the 2nd floor of the 10th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0275] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 37th slot, exit from the 5th floor of the 46th slot, then enter from the 6th floor of the 1st slot, exit from the 7th floor of the 9th slot, then enter from the 8th floor of the 18th slot, exit from the 8th floor of the 27th slot, then enter from the 7th floor of the 18th slot, exit from the 6th floor of the 10th slot, then enter from the 5th floor of the 1st slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 37th slot, exit from the 29th floor, then enter from the 1st floor of the 20th slot, exit from the 1st floor of the 30th slot, thus completing the second traversal.

[0276] Then enter from the 2nd layer of the 39th slot, exit from the 3rd layer of the 47th slot, then enter from the 4th layer of the 2nd slot, exit from the 5th layer of the 11th slot, then enter from the 6th layer of the 20th slot, exit from the 7th layer of the 28th slot, then enter from the 8th layer of the 37th slot, exit from the 8th layer of the 46th slot, then enter from the 7th layer of the 37th slot, exit from the 6th layer of the 29th slot, then enter from the 5th layer of the 20th slot, exit from the 4th layer of the 11th slot, then enter from the 3rd layer of the 2nd slot, exit from the 2nd layer of the 48th slot, then enter from the 1st layer of the 39th slot, exit from the 1st layer of the 46th slot, and now lead out from the 1st layer of the 46th slot to form the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0277] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 46th groove" means connecting the flat wire of the first layer of the 46th groove at the crown end.

[0278] The second parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 2in, enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 10th slot, then enter from the 4th floor of the 19th slot, exit from the 5th floor of the 28th slot, then enter from the 6th floor of the 37th slot, exit from the 7th floor of the 45th slot, then enter from the 8th floor of the 54th slot, exit from the 8th floor of the 9th slot, then enter from the 7th floor of the 54th slot, exit from the 6th floor of the 46th slot, then enter from the 5th floor of the 37th slot, exit from the 4th floor of the 28th slot, then enter from the 3rd floor of the 19th slot, exit from the 2nd floor of the 11th slot, then enter from the 1st floor of the 2nd slot, and exit from the 1st floor of the 12th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0279] Then enter from the 2nd floor of the 21st slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 38th slot, exit from the 5th floor of the 47th slot, then enter from the 6th floor of the 2nd slot, exit from the 7th floor of the 10th slot, then enter from the 8th floor of the 19th slot, exit from the 8th floor of the 28th slot, then enter from the 7th floor of the 19th slot, exit from the 6th floor of the 11th slot, then enter from the 5th floor of the 2nd slot, exit from the 4th floor of the 47th slot, then enter from the 3rd floor of the 38th slot, exit from the 2nd floor of the 30th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot, thus completing the second traversal.

[0280] Then enter from the 2nd layer of the 37th slot, exit from the 3rd layer of the 45th slot, then enter from the 4th layer of the 54th slot, exit from the 5th layer of the 9th slot, then enter from the 6th layer of the 18th slot, exit from the 7th layer of the 26th slot, then enter from the 8th layer of the 35th slot, exit from the 8th layer of the 44th slot, then enter from the 7th layer of the 35th slot, exit from the 6th layer of the 27th slot, then enter from the 5th layer of the 18th slot, exit from the 4th layer of the 9th slot, then enter from the 3rd layer of the 54th slot, exit from the 2nd layer of the 46th slot, then enter from the 1st layer of the 37th slot, exit from the 1st layer of the 47th slot, and now lead out from the 1st layer of the 47th slot to form the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0281] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0282] The third parallel branch of the U phase winding uses the second layer of the third slot as the incoming line terminal U 3in, enter from the 2nd floor of the 3rd slot, exit from the 3rd floor of the 11th slot, then enter from the 4th floor of the 20th slot, exit from the 5th floor of the 29th slot, then enter from the 6th floor of the 38th slot, exit from the 7th floor of the 46th slot, then enter from the 8th floor of the 1st slot, exit from the 8th floor of the 10th slot, then enter from the 7th floor of the 1st slot, exit from the 6th floor of the 47th slot, then enter from the 5th floor of the 38th slot, exit from the 4th floor of the 29th slot, then enter from the 3rd floor of the 20th slot, exit from the 2nd floor of the 12th slot, then enter from the 1st floor of the 3rd slot, and exit from the 1st floor of the 10th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0283] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 36th slot, exit from the 5th floor of the 45th slot, then enter from the 6th floor of the 54th slot, exit from the 7th floor of the 8th slot, then enter from the 8th floor of the 17th slot, exit from the 8th floor of the 26th slot, then enter from the 7th floor of the 17th slot, exit from the 6th floor of the 9th slot, then enter from the 5th floor of the 54th slot, exit from the 4th floor of the 45th slot, then enter from the 3rd floor of the 36th slot, exit from the 28th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot, thus completing the second traversal.

[0284] Then enter from the 2nd layer of the 38th slot, exit from the 3rd layer of the 46th slot, then enter from the 4th layer of the 1st slot, exit from the 5th layer of the 10th slot, then enter from the 6th layer of the 19th slot, exit from the 7th layer of the 27th slot, then enter from the 8th layer of the 36th slot, exit from the 8th layer of the 45th slot, then enter from the 7th layer of the 36th slot, exit from the 6th layer of the 28th slot, then enter from the 5th layer of the 19th slot, exit from the 4th layer of the 10th slot, then enter from the 3rd layer of the 1st slot, exit from the 2nd layer of the 47th slot, then enter from the 1st layer of the 38th slot, exit from the 1st layer of the 48th slot, and now lead out from the 1st layer of the 48th slot to form the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0285] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 3rd groove" means connecting the flat wire of the 2nd layer of the 3rd groove at the welding end, and "leading out from the 1st layer of the 48th groove" means connecting the flat wire of the 1st layer of the 48th groove at the crown end.

[0286] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Fig. 9 The connection method of the second branch of the V phase and the second branch of the W phase is Fig. 9 The connection method of the third branch of the V phase and the third branch of the W phase is Fig. 9It can be obtained by translating based on the third branch of the U phase.

[0287] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=8, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Fig.10 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0288] like Fig.10 As shown, each winding slot contains 8 layers of flat wires, the first layer is marked as L1, the second layer is marked as L2, the third layer is marked as L3, the fourth layer is marked as L4, the fifth layer is marked as L5, the sixth layer is marked as L6, the seventh layer is marked as L7, and the eighth layer is marked as L8. The first layer is the bottom layer of the winding slot, and the eighth layer is the slot opening layer.

[0289] Fig.10 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 8, L = T1 + T2 + T3, T1, T2, T3 are 3, 2, 3 respectively, T1 contains the 1st / 2nd / 3rd layer of flat wires, T2 contains the 4th / 5th layer of flat wires, T3 contains the 6th / 7th / 8th layer of flat wires, the 1st / 2nd / 3rd layer of flat wires, the 4th / 5th layer of flat wires, and the 6th / 7th / 8th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve a continuous short distance effect.

[0290] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The first layer of hairpin coils contains two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The 8th layer is the hairpin coil of the same layer, with only one span, which is Z / 2p=9. The hairpin coils between the 2nd and 8th layers only contain one span, which is Z / 2p=9. The welding layer between the 2nd and 8th layers contains two spans, which are Z / 2p-1=8 and Z / 2p=9.

[0291] The total number of hairpin coil types is 2+floor(L / 2)=6.

[0292] like Fig.10As shown, the T1-layer flat wire, the T2-layer flat wire and the T3-layer flat wire respectively include different phase belts, each phase belt includes three winding slots arranged adjacently, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, and the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire. For example, in the T1-layer flat wire, the 1st / 2nd / 3rd-layer flat wires in the 10th slot, the 11th slot and the 12th slot are one phase belt, in the T2-layer flat wire, the 4th / 5th-layer flat wires in the 9th slot, the 10th slot and the 11th slot are one phase belt, and in the T3-layer flat wire, the 6th / 7th / 8th-layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase belt. All the flat wires in the 1st / 2nd / 3rd layers constitute a first circle of flat wires 120a, all the flat wires in the 4th / 5th layers constitute a second circle of flat wires 120b, and all the flat wires in the 6th / 7th / 8th layers constitute a third circle of flat wires 120c.

[0293] like Fig.10 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0294] Combine the following Fig.10 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Fig.10 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0295] like Fig.10 As shown, the first parallel branch of the U-phase winding uses the second layer of the first slot as the incoming line terminal U 1in , enter from the 2nd floor of the 1st slot, exit from the 3rd floor of the 10th slot, then enter from the 4th floor of the 18th slot, exit from the 5th floor of the 27th slot, then enter from the 6th floor of the 35th slot, exit from the 7th floor of the 44th slot, then enter from the 8th floor of the 53rd slot, exit from the 8th floor of the 8th slot, then enter from the 7th floor of the 53rd slot, exit from the 6th floor of the 44th slot, then enter from the 5th floor of the 36th slot, exit from the 4th floor of the 27th slot, then enter from the 3rd floor of the 19th slot, exit from the 2nd floor of the 10th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0296] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 37th slot, exit from the 5th floor of the 46th slot, then enter from the 6th floor of the 54th slot, exit from the 7th floor of the 9th slot, then enter from the 8th floor of the 18th slot, exit from the 8th floor of the 27th slot, then enter from the 7th floor of the 18th slot, exit from the 6th floor of the 9th slot, then enter from the 5th floor of the 1st slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 38th slot, exit from the 29th slot, then enter from the 1st floor of the 20th slot, and exit from the 1st floor of the 30th slot, thus completing the second traversal.

[0297] Then enter from the 2nd layer of the 39th slot, exit from the 3rd layer of the 48th slot, then enter from the 4th layer of the 2nd slot, exit from the 5th layer of the 11th slot, then enter from the 6th layer of the 19th slot, exit from the 7th layer of the 28th slot, then enter from the 8th layer of the 37th slot, exit from the 8th layer of the 46th slot, then enter from the 7th layer of the 37th slot, exit from the 6th layer of the 28th slot, then enter from the 5th layer of the 20th slot, exit from the 4th layer of the 11th slot, then enter from the 3rd layer of the 3rd slot, exit from the 2nd layer of the 48th slot, then enter from the 1st layer of the 39th slot, exit from the 1st layer of the 46th slot, and now lead out from the 1st layer of the 46th slot to form the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0298] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 46th groove" means connecting the flat wire of the first layer of the 46th groove at the crown end.

[0299] The second parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 2in , enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 11th slot, then enter from the 4th floor of the 19th slot, exit from the 5th floor of the 28th slot, then enter from the 6th floor of the 36th slot, exit from the 7th floor of the 45th slot, then enter from the 8th floor of the 54th slot, exit from the 8th floor of the 9th slot, then enter from the 7th floor of the 54th slot, exit from the 6th floor of the 45th slot, then enter from the 5th floor of the 37th slot, exit from the 4th floor of the 28th slot, then enter from the 3rd floor of the 20th slot, exit from the 2nd floor of the 11th slot, then enter from the 1st floor of the 2nd slot, and exit from the 1st floor of the 12th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0300] Then enter from the 2nd floor of the 21st slot, exit from the 3rd floor of the 30th slot, then enter from the 4th floor of the 38th slot, exit from the 5th floor of the 47th slot, then enter from the 6th floor of the 2nd slot, exit from the 7th floor of the 10th slot, then enter from the 8th floor of the 19th slot, exit from the 8th floor of the 28th slot, then enter from the 7th floor of the 19th slot, exit from the 6th floor of the 11th slot, then enter from the 5th floor of the 2nd slot, exit from the 4th floor of the 47th slot, then enter from the 3rd floor of the 39th slot, exit from the 2nd floor of the 30th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot, thus completing the second traversal.

[0301] Then enter from the 2nd layer of the 37th slot, exit from the 3rd layer of the 46th slot, then enter from the 4th layer of the 54th slot, exit from the 5th layer of the 9th slot, then enter from the 6th layer of the 17th slot, exit from the 7th layer of the 26th slot, then enter from the 8th layer of the 35th slot, exit from the 8th layer of the 44th slot, then enter from the 7th layer of the 35th slot, exit from the 6th layer of the 26th slot, then enter from the 5th layer of the 18th slot, exit from the 4th layer of the 9th slot, then enter from the 3rd layer of the 1st slot, exit from the 2nd layer of the 46th slot, then enter from the 1st layer of the 37th slot, exit from the 1st layer of the 47th slot, and now lead out from the 1st layer of the 47th slot to form the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0302] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0303] The third parallel branch of the U phase winding uses the second layer of the third slot as the incoming line terminal U 3in , enter from the 2nd floor of the 3rd slot, exit from the 3rd floor of the 12th slot, then enter from the 4th floor of the 20th slot, exit from the 5th floor of the 29th slot, then enter from the 6th floor of the 37th slot, exit from the 7th floor of the 46th slot, then enter from the 8th floor of the 1st slot, exit from the 8th floor of the 10th slot, then enter from the 7th floor of the 1st slot, exit from the 6th floor of the 46th slot, then enter from the 5th floor of the 38th slot, exit from the 4th floor of the 29th slot, then enter from the 3rd floor of the 21st slot, exit from the 2nd floor of the 12th slot, then enter from the 1st floor of the 3rd slot, and exit from the 1st floor of the 10th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 8th floor.

[0304] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 36th slot, exit from the 5th floor of the 45th slot, then enter from the 6th floor of the 53rd slot, exit from the 7th floor of the 8th slot, then enter from the 8th floor of the 17th slot, exit from the 8th floor of the 26th slot, then enter from the 7th floor of the 17th slot, exit from the 6th floor of the 8th slot, then enter from the 5th floor of the 54th slot, exit from the 4th floor of the 45th slot, then enter from the 3rd floor of the 37th slot, exit from the 28th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot, thus completing the second traversal.

[0305] Then enter from the 2nd layer of the 38th slot, exit from the 3rd layer of the 47th slot, then enter from the 4th layer of the 1st slot, exit from the 5th layer of the 10th slot, then enter from the 6th layer of the 18th slot, exit from the 7th layer of the 27th slot, then enter from the 8th layer of the 36th slot, exit from the 8th layer of the 45th slot, then enter from the 7th layer of the 36th slot, exit from the 6th layer of the 27th slot, then enter from the 5th layer of the 19th slot, exit from the 4th layer of the 10th slot, then enter from the 3rd layer of the 2nd slot, exit from the 2nd layer of the 47th slot, then enter from the 1st layer of the 38th slot, exit from the 1st layer of the 48th slot, and thus lead out from the 1st layer of the 48th slot to form the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0306] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 3rd groove" means connecting the flat wire of the 2nd layer of the 3rd groove at the welding end, and "leading out from the 1st layer of the 48th groove" means connecting the flat wire of the 1st layer of the 48th groove at the crown end.

[0307] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Fig.10 The connection method of the second branch of the V phase and the second branch of the W phase is Fig.10 The connection method of the third branch of the V phase and the third branch of the W phase is Fig.10 It can be obtained by translating based on the third branch of the U phase.

[0308] In one embodiment, the number of winding slots of the stator core is Z=54, the number of stator winding poles and the number of rotor poles is 2p=6, the number of slots per pole per phase is q=Z / (2mp)=3, the number of flat wire layers in the winding slots is L=10, the stator winding is divided into U phase, V phase, and W phase, and the number of parallel branches set for each phase winding is p=3. Fig.11 The figure is a connection diagram of three parallel branches of the U phase in this embodiment. It should be noted that the number of parallel branches compatible with the winding of this solution is 2p=6.

[0309] like Fig.11As shown, each winding slot contains 10 layers of flat wires, the first layer is L1, the second layer is L2, the third layer is L3, the fourth layer is L4, the fifth layer is L5, the sixth layer is L6, the seventh layer is L7, the eighth layer is L8, the ninth layer is L9, and the tenth layer is L10. The first layer is the bottom layer of the winding slot, and the tenth layer is the slot opening layer.

[0310] Fig.11 Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The number of layers L = 10, L = T1 + T2 + T3, T1, T2, T3 are 3, 4, 3 respectively, T1 contains the 1st / 2nd / 3rd layer of flat wires, T2 contains the 4th / 5th / 6th / 7th layer of flat wires, T3 contains the 8th / 9th / 10th layer of flat wires, the 1st / 2nd / 3rd layer of flat wires, the 4th / 5th / 6th / 7th layer of flat wires, and the 8th / 9th / 10th layer of flat wires are staggered by 1 winding slot in sequence, so that the winding can achieve the effect of continuous short distance.

[0311] The head end lead wires are led out from the second layer of the 1st, 2nd and 3rd slots, and the tail end lead wires are led out from the first layer of the 46th, 47th and 48th slots. The first layer of hairpin coils contains two spans, which are Z / 2p+1=10 and Z / 2p-q+1=7 respectively. The 10th layer is the hairpin coil of the same layer, with only one span, which is Z / 2p=9. The hairpin coils between the 2nd and 10th layers only contain one span, which is Z / 2p=9. The welding layers between the 2nd and 10th layers contain two spans, which are Z / 2p-1=8 and Z / 2p=9.

[0312] The total number of hairpin coil types is 2+floor(L / 2)=7.

[0313] like Fig.11 As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0314] Combine the following Fig.11 The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Fig.11 The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0315] like Fig.11 As shown, the first parallel branch of the U-phase winding uses the second layer of the first slot as the incoming line terminal U 1in, enter from the 2nd floor of the 1st slot, exit from the 3rd floor of the 10th slot, then enter from the 4th floor of the 18th slot, exit from the 5th floor of the 27th slot, then enter from the 6th floor of the 36th slot, exit from the 7th floor of the 45th slot, then enter from the 8th floor of the 53rd slot, exit from the 9th floor of the 8th slot, then enter from the 10th floor of the 17th slot, exit from the 10th floor of the 26th slot, then enter from the 9th floor of the 17th slot, exit from the 8th floor of the 8th slot, then enter from the 7th floor of the 54th slot, exit from the 6th floor of the 45th slot, then enter from the 5th floor of the 36th slot, exit from the 4th floor of the 27th slot, then enter from the 3rd floor of the 19th slot, exit from the 2nd floor of the 10th slot, then enter from the 1st floor of the 1st slot, and exit from the 1st floor of the 11th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 10th floor.

[0316] Then enter from the 2nd floor of the 20th slot, exit from the 3rd floor of the 29th slot, then enter from the 4th floor of the 37th slot, exit from the 5th floor of the 46th slot, then enter from the 6th floor of the 1st slot, exit from the 7th floor of the 10th slot, then enter from the 8th floor of the 18th slot, exit from the 9th floor of the 27th slot, then enter from the 10th floor of the 36th slot, exit from the 10th floor of the 45th slot, then enter from the 9th floor of the 36th slot, exit from the 8th floor of the 27th slot, then enter from the 7th floor of the 19th slot, exit from the 6th floor of the 10th slot, then enter from the 5th floor of the 1st slot, exit from the 4th floor of the 46th slot, then enter from the 3rd floor of the 38th slot, exit from the 2nd floor of the 29th slot, then enter from the 1st floor of the 20th slot, and exit from the 1st floor of the 30th slot. At this point, the second traversal is completed.

[0317] Then enter from the 2nd layer of the 39th slot, exit from the 3rd layer of the 48th slot, then enter from the 4th layer of the 2nd slot, exit from the 5th layer of the 11th slot, then enter from the 6th layer of the 20th slot, exit from the 7th layer of the 29th slot, then enter from the 8th layer of the 37th slot, exit from the 9th layer of the 46th slot, then enter from the 10th layer of the 1st slot, exit from the 10th layer of the 10th slot, then enter from the 9th layer of the 1st slot, exit from the 8th layer of the 46th slot, then enter from the 7th layer of the 38th slot, exit from the 6th layer of the 29th slot, then enter from the 5th layer of the 20th slot, exit from the 4th layer of the 11th slot, then enter from the 3rd layer of the 3rd slot, exit from the 2nd layer of the 48th slot, then enter from the 1st layer of the 39th slot, exit from the 1st layer of the 46th slot, and now it is led out from the 1st layer of the 46th slot to form the outlet terminal U of the first parallel branch of the U-phase winding. 1out .

[0318] It should be noted that in the above connection methods, for example, "entering from the second layer of the first groove" means connecting the flat wire of the second layer of the first groove at the welding end, and "leading out from the first layer of the 46th groove" means connecting the flat wire of the first layer of the 46th groove at the crown end.

[0319] The second parallel branch of the U phase winding uses the second slot and the second layer as the incoming line terminal U 2in , enter from the 2nd floor of the 2nd slot, exit from the 3rd floor of the 11th slot, then enter from the 4th floor of the 19th slot, exit from the 5th floor of the 28th slot, then enter from the 6th floor of the 37th slot, exit from the 7th floor of the 46th slot, then enter from the 8th floor of the 54th slot, exit from the 9th floor of the 9th slot, then enter from the 10th floor of the 18th slot, exit from the 10th floor of the 27th slot, then enter from the 9th floor of the 18th slot, exit from the 8th floor of the 9th slot, then enter from the 7th floor of the 1st slot, exit from the 6th floor of the 46th slot, then enter from the 5th floor of the 37th slot, exit from the 4th floor of the 28th slot, then enter from the 3rd floor of the 20th slot, exit from the 2nd floor of the 11th slot, then enter from the 1st floor of the 2nd slot, and exit from the 1st floor of the 12th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 10th floor.

[0320] Then enter from the 2nd floor of the 21st slot, exit from the 3rd floor of the 30th slot, then enter from the 4th floor of the 38th slot, exit from the 5th floor of the 47th slot, then enter from the 6th floor of the 2nd slot, exit from the 7th floor of the 11th slot, then enter from the 8th floor of the 19th slot, exit from the 9th floor of the 28th slot, then enter from the 10th floor of the 37th slot, exit from the 10th floor of the 46th slot, then enter from the 9th floor of the 37th slot, exit from the 8th floor of the 28th slot, then enter from the 7th floor of the 20th slot, exit from the 6th floor of the 11th slot, then enter from the 5th floor of the 2nd slot, exit from the 4th floor of the 47th slot, then enter from the 3rd floor of the 39th slot, exit from the 2nd floor of the 30th slot, then enter from the 1st floor of the 21st slot, exit from the 1st floor of the 28th slot. At this point, the second traversal is completed.

[0321] Then enter from the 2nd layer of the 37th slot, exit from the 3rd layer of the 46th slot, then enter from the 4th layer of the 54th slot, exit from the 5th layer of the 9th slot, then enter from the 6th layer of the 18th slot, exit from the 7th layer of the 27th slot, then enter from the 8th layer of the 35th slot, exit from the 9th layer of the 44th slot, then enter from the 10th layer of the 53rd slot, exit from the 10th layer of the 8th slot, then enter from the 9th layer of the 53rd slot, exit from the 8th layer of the 44th slot, then enter from the 7th layer of the 36th slot, exit from the 6th layer of the 27th slot, then enter from the 5th layer of the 18th slot, exit from the 4th layer of the 9th slot, then enter from the 3rd layer of the 1st slot, exit from the 2nd layer of the 46th slot, then enter from the 1st layer of the 37th slot, exit from the 1st layer of the 47th slot, and now it is led out from the 1st layer of the 47th slot to form the outlet terminal U of the second parallel branch of the U-phase winding. 2out .

[0322] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 2nd groove" means connecting the flat wire of the 2nd layer of the 2nd groove at the welding end, and "leading out from the 1st layer of the 47th groove" means connecting the flat wire of the 1st layer of the 47th groove at the crown end.

[0323] The third parallel branch of the U phase winding uses the second layer of the third slot as the incoming line terminal U 3in , enter from the 2nd floor of the 3rd slot, exit from the 3rd floor of the 12th slot, then enter from the 4th floor of the 20th slot, exit from the 5th floor of the 29th slot, then enter from the 6th floor of the 38th slot, exit from the 7th floor of the 47th slot, then enter from the 8th floor of the 1st slot, exit from the 9th floor of the 10th slot, then enter from the 10th floor of the 19th slot, exit from the 10th floor of the 28th slot, then enter from the 9th floor of the 19th slot, exit from the 8th floor of the 10th slot, then enter from the 7th floor of the 2nd slot, exit from the 6th floor of the 47th slot, then enter from the 5th floor of the 38th slot, exit from the 4th floor of the 29th slot, then enter from the 3rd floor of the 21st slot, exit from the 2nd floor of the 12th slot, then enter from the 1st floor of the 3rd slot, exit from the 1st floor of the 10th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 10th floor.

[0324] Then enter from the 2nd floor of the 19th slot, exit from the 3rd floor of the 28th slot, then enter from the 4th floor of the 36th slot, exit from the 5th floor of the 45th slot, then enter from the 6th floor of the 54th slot, exit from the 7th floor of the 9th slot, then enter from the 8th floor of the 17th slot, exit from the 9th floor of the 26th slot, then enter from the 10th floor of the 35th slot, exit from the 10th floor of the 44th slot, then enter from the 9th floor of the 35th slot, exit from the 8th floor of the 26th slot, then enter from the 7th floor of the 18th slot, exit from the 6th floor of the 9th slot, then enter from the 5th floor of the 54th slot, exit from the 4th floor of the 45th slot, then enter from the 3rd floor of the 37th slot, exit from the 2nd floor of the 28th slot, then enter from the 1st floor of the 19th slot, exit from the 1st floor of the 29th slot. At this point, the second traversal is completed.

[0325] Then enter from the 2nd layer of the 38th slot, exit from the 3rd layer of the 47th slot, then enter from the 4th layer of the 1st slot, exit from the 5th layer of the 10th slot, then enter from the 6th layer of the 19th slot, exit from the 7th layer of the 28th slot, then enter from the 8th layer of the 36th slot, exit from the 9th layer of the 45th slot, then enter from the 10th layer of the 54th slot, exit from the 10th layer of the 9th slot, then enter from the 9th layer of the 54th slot, exit from the 8th layer of the 45th slot, then enter from the 7th layer of the 37th slot, exit from the 6th layer of the 28th slot, then enter from the 5th layer of the 19th slot, exit from the 4th layer of the 10th slot, then enter from the 3rd layer of the 2nd slot, exit from the 2nd layer of the 47th slot, then enter from the 1st layer of the 38th slot, exit from the 1st layer of the 48th slot, and now it is led out from the 1st layer of the 48th slot to form the outlet terminal U of the third parallel branch of the U-phase winding. 3out .

[0326] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 3rd groove" means connecting the flat wire of the 2nd layer of the 3rd groove at the welding end, and "leading out from the 1st layer of the 48th groove" means connecting the flat wire of the 1st layer of the 48th groove at the crown end.

[0327] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Fig.11 The connection method of the second branch of the V phase and the second branch of the W phase is Fig.11 The connection method of the third branch of the V phase and the third branch of the W phase is Fig.11 It can be obtained by translating based on the third branch of the U phase.

[0328] like Figures 5 to 11 As shown, the winding arrangement in this application is applicable to both even-numbered-layer windings and odd-numbered-layer windings, which broadens the flexibility of winding design. Multi-turn flat wire groups are staggered by one winding slot, which is equivalent to a continuous short distance, and can simultaneously weaken the 6k±1 (k=1 or 2) harmonics of the winding, thereby improving the NVH performance. The flat wires in each parallel sub-winding of each phase are evenly distributed in different layers of each winding slot. The back electromotive force and current of each parallel sub-winding are exactly the same, which eliminates the additional copper loss of the winding circulating current caused by the parallel connection of the windings, ensures the uniformity of the winding temperature, and thus improves the life of the motor. The three-phase lead wires are located at the same layer at the bottom of the slot, and the branch lead wires are located in adjacent layers, which can make full use of the radial space, simplify the Busbar structure, and reduce the end height. The hairpin coils on each layer are independent of each other, and there are no additional cross-layer hairpin coils. Fully automated wire insertion can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0329] The flat wire motor, powertrain and electric vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A flat wire motor, characterized in that: The motor stator of the flat wire motor comprises a plurality of winding slots, in each of which at least four flat wires are sequentially arranged in layers along the radial direction of the flat wire motor, the flat wires accommodated in the plurality of winding slots are sequentially arranged in layers along the radial direction of the flat wire motor into three circles of flat wires, each circle of the flat wires is divided into a plurality of groups of flat wires arranged along the circumferential direction of the flat wire motor, each group of the flat wires comprises one flat wire in the same winding slot or a plurality of the flat wires sequentially arranged adjacent to each other, wherein: The three circles of flat wires include a first circle of flat wires and a second circle of flat wires that are arranged adjacently, the distance between the first circle of flat wires and the axis of the flat wire motor along the radial direction of the flat wire motor is greater than the distance between the second circle of flat wires and the axis of the flat wire motor, and the number of flat wires in each group of the flat wires of the first circle of flat wires is different from the number of flat wires in each group of the flat wires of the second circle of flat wires; Each group of flat wires in the first circle of flat wires includes a first layer of flat wires, and the distance between the first layer of flat wires and the axis of the flat wire motor is greater than the distance between any other flat wire in the winding slot where the flat wire is located and the axis of the flat wire motor. The first layer of flat wires in each group of flat wires in the first circle of flat wires is used to connect one of the first layer of flat wires in another group of flat wires in the first circle of flat wires through two cross-line segments with different lengths.

2. The flat wire motor according to claim 1, characterized in that: The number of the flat wires in each group of the flat wires in the first circle of flat wires is smaller than the number of the flat wires in each group of the flat wires in the second circle of flat wires.

3. The flat wire motor according to claim 1, characterized in that: The number of the flat wires in each group of the flat wires in the first circle of flat wires is greater than the number of the flat wires in each group of the flat wires in the second circle of flat wires.

4. The flat wire motor according to claim 1 or 2, characterized in that: Each group of the flat wires of the second circle of flat wires further includes a second layer of flat wires and a third layer of flat wires, and the second layer of flat wires is arranged between the third layer of flat wires and the first layer of flat wires of the first circle of flat wires along the radial direction of the flat wire motor, wherein: One of the second-layer flat wires in each group of the flat wires in the second circle of flat wires is connected to one of the third-layer flat wires in another group of the flat wires in the second circle of flat wires through the same type of cross-wire segment.

5. The flat wire motor according to any one of claims 1 to 3, characterized in that: Each group of the flat wires of the first circle of flat wires further includes a second layer of flat wires, and one of the second layer of flat wires is arranged adjacent to one of the first layer of flat wires in the radial direction of the flat wire motor; each group of the flat wires of the second circle of flat wires includes a third layer of flat wires, and one of the third layer of flat wires of the second circle of flat wires is arranged adjacent to one of the second layer of flat wires of the first circle of flat wires in the radial direction of the flat wire motor, wherein: Each of the second-layer flat wires of the first circle of flat wires is connected to one of the third-layer flat wires of each group of the flat wires of the second circle of flat wires through the same type of cross-wire segment.

6. The flat wire motor according to claim 5, characterized in that: The number of winding slots spanned by a cross-wire segment connected to each of the second-layer flat wires of the first circle of flat wires is different from the number of winding slots spanned by a cross-wire segment connected to each of the first-layer flat wires of the first circle of flat wires.

7. The flat wire motor according to any one of claims 1 to 3, characterized in that: Each group of the flat wires of the first circle of flat wires further includes a second layer of flat wires and a third layer of flat wires, and the second layer of flat wires is arranged between the first layer of flat wires and the third layer of flat wires along the radial direction of the flat wire motor, wherein: One of the second-layer flat wires in each group of the flat wires in the first circle of flat wires is connected to one of the third-layer flat wires in another group of the flat wires in the first circle of flat wires through the same type of cross-wire segment.

8. The flat wire motor according to claim 7, characterized in that: The number of winding slots spanned by a cross-wire segment connected to a second-layer flat wire in each group of the flat wires in the first circle of flat wires is different from the number of winding slots spanned by a cross-wire segment connected to a first-layer flat wire in each group of the flat wires in the first circle of flat wires.

9. The flat wire motor according to any one of claims 1 to 8, characterized in that: The three circles of flat wires include a third circle of flat wires. The first circle of flat wires, the second circle of flat wires and the third circle of flat wires are arranged in sequence along the radial direction of the flat wire motor. The number of flat wires in each group of the third circle of flat wires is different from the number of flat wires in each group of the second circle of flat wires.

10. The flat wire motor according to claim 9, characterized in that: The sum of the number of the flat wires in a group of the first circle of flat wires, the second circle of flat wires and the third circle of flat wires is N, and N is an even number. Each group of the flat wires in the third circle of flat wires includes an N-th layer of flat wires, and the distance between the N-th layer of flat wires and the axis of the flat wire motor is smaller than the distance between any other flat wire in the third circle of flat wires except the N-th layer of flat wires and the axis of the flat wire motor, wherein: The N-th layer of flat wires in each group of the flat wires in the third circle of flat wires is used to connect one of the N-th layer of flat wires in another group of the flat wires in the third circle of flat wires through a cross-line segment; The number of winding slots spanned by a cross-wire segment connected to each of the N-th layer of flat wires in a group of the flat wires of the third circle of flat wires is the same.

11. The flat wire motor according to claim 9, characterized in that: The sum of the numbers of the flat wires in a group of the first circle of flat wires, the second circle of flat wires and the third circle of flat wires is N, and N is an odd number. Each group of the flat wires in the third circle of flat wires includes an N-1th layer of flat wires and an Nth layer of flat wires arranged adjacently, and a spacing between the Nth layer of flat wires and the axis of the flat wire motor is smaller than a spacing between any other flat wire in the third circle of flat wires except the Nth layer of flat wires and the axis of the flat wire motor.

12. The flat wire motor according to claim 11, characterized in that: The N-1th layer of flat wires of each group of the flat wires in the third circle of flat wires is used to connect the Nth layer of flat wires of another group of the flat wires in the third circle of flat wires through a cross-line segment; The number of winding slots spanned by a cross-wire segment connected to each of the N-1th layer of flat wires of the third circle of flat wires is the same.

13. The flat wire motor according to any one of claims 1 to 12, characterized in that: Each circle of the flat wire is divided into a plurality of phase belts arranged along the circumference of the flat wire motor, and each phase belt includes three groups of the flat wires, wherein: A phase belt of the first coil of flat wire and a phase belt of the second coil of flat wire are offset by one winding slot.

14. A powertrain, characterized in that: The power assembly includes a reducer and a flat wire motor as described in any one of claims 1 to 13, wherein the motor shaft of the flat wire motor is used for transmission connection to the input shaft of the reducer, and the output shaft of the reducer is used for driving the wheels of the electric vehicle.

15. An electric vehicle, characterized in that: The electric vehicle comprises a frame, a power battery and a power assembly as described in claim 14, wherein the frame is used to fix the power battery and the power assembly, the power battery is used to supply power to the motor, and the motor is used to drive the wheels of the electric vehicle through the reducer.

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