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 slots and N circles of flat wires arranged along the radial direction of the flat wire motor, N is an integer greater than or equal to 2, each circle of flat wires comprises a plurality of pairs of flat wires arranged along the circumferential direction of the flat wire motor, each winding slot is used for accommodating one pair of flat wires in each circle of flat wires, and the winding slots are arranged in the winding slots. Each pair of flat wires comprises an outer-layer flat wire and an inner-layer flat wire. Wherein the N circles of flat wires comprise a first circle of flat wires, outer-layer flat wires in the first circle of flat wires comprise a first flat wire, a second flat wire and a third flat wire, and the first flat wire, the second flat wire and the third flat wire are respectively connected with the inner-layer flat wires correspondingly connected with the first flat wire, the second flat wire and the third flat wire through three cross-wire sections with different lengths. The first flat wire, the second flat wire and the third flat wire are respectively connected with the inner-layer flat wires correspondingly connected with the first flat wire, the second flat wire and the third flat wire through three cross-wire sections with different lengths, so that the winding can realize a continuous short-distance effect, and the NVH (Noise Vibration and Harshness) 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 comprises a plurality of winding slots and N turns of flat wire, wherein the N turns of flat wire are arranged radially along the flat wire motor, wherein N is an integer greater than or equal to 2, wherein each turn of flat wire comprises a plurality of pairs of flat wires arranged circumferentially along the flat wire motor, wherein each winding slot is used to accommodate a pair of flat wires in each turn of the N turns of flat wire, wherein each pair of flat wires comprises an outer flat wire and an inner flat wire, wherein the distance between an outer 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 an inner flat wire and the axis of the flat wire motor, wherein an outer flat wire in each pair of flat wires in each turn of flat wires is used to connect an inner flat wire in another pair of flat wires. The N turns of flat wires comprise a first turn of flat wires, wherein the outer flat wires in the first turn of flat wires comprise a first flat wire, a second flat wire, and a third flat wire, wherein the first flat wire, the second flat wire, and the third flat wire are connected to the inner flat wires corresponding to them respectively through three cross-wire segments of different lengths.

[0005] In an embodiment of the present application, N circles of flat wire are arranged radially along the flat wire motor, N is an integer greater than or equal to 2, each circle of flat wire includes multiple pairs of flat wires, and the multiple pairs of flat wires in each circle of flat wire are arranged circumferentially along the flat wire motor, so that the outer flat wires and the inner flat wires of two adjacent layers in each circle of flat wire can be connected in series, which is beneficial to realize multi-layer series connection of the winding, reduce the eddy current loss of the flat wire, improve the efficiency of the flat wire motor when running at high speed, and also help to 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 distance between an outer 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 an inner flat wire and the axis of the flat wire motor, so that the outer flat wire of the first circle of flat wire is located at the bottom slot of the winding slot.

[0007] In an embodiment of the present application, the outer layer of flat wires in the first circle of flat wires includes a first flat wire, a second flat wire and a third flat wire. The first flat wire, the second flat wire and the third flat wire are connected to the inner layer of flat wires corresponding to them respectively through three span segments of different lengths, so that the winding method of the first circle of flat wires in the winding slot has a variety of spans, which is beneficial to achieve a continuous short-distance effect for the winding in the motor stator with N circles of flat wires, 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 difference between the number of winding slots spanned by a span segment connected by the third flat wire and the number of winding slots spanned by a span segment connected by the second flat wire is 1, and the difference between the number of winding slots spanned by a span segment connected by the second flat wire and the number of winding slots spanned by a span segment connected by the first flat wire is 2.

[0009] In an embodiment of the present application, the number of winding slots spanned by a spanning segment connected by the first flat wire, a spanning segment connected by the second flat wire, and a spanning segment connected by the third flat wire are all different, so that the winding method of the flat wire in the winding slot has a variety of spans, which is conducive to making the winding achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0010] In one embodiment, the first flat wire and an inner flat wire connected thereto are arranged between the third flat wire and an inner flat wire connected thereto.

[0011] In an embodiment of the present application, the first flat wire and an inner layer flat wire connected thereto are arranged between the third flat wire and an inner layer flat wire connected thereto, so that the number of winding slots spanned by the cross-wire segment connecting the first flat wire and an inner layer flat wire connected thereto is smaller than the number of winding slots spanned by the cross-wire segment connecting the third flat wire and an inner layer flat wire connected thereto, which is beneficial for forming a short-distance winding, thereby facilitating reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor.

[0012] In one embodiment, a first flat wire and a third flat wire are arranged adjacent to each other, and a winding slot is spaced between an inner flat wire connected to a first flat wire and an inner flat wire connected to a third flat wire.

[0013] In an embodiment of the present application, a first flat wire and a third flat wire are arranged adjacent to each other, and a winding slot is spaced between an inner layer flat wire connected to the first flat wire and an inner layer flat wire connected to the third flat wire, so that the number of winding slots spanned by the cross-wire segment used to connect the first flat wire and the inner layer flat wire connected thereto is different from the number of winding slots spanned by the cross-wire segment used to connect the third flat wire and the inner layer flat wire connected thereto, which is conducive to forming a short-distance winding, thereby facilitating reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor.

[0014] In one embodiment, the outer layer of flat wires in the first circle of flat wires includes two third flat wires, and the two third flat wires are adjacently arranged on the same side of the first flat wire along the circumferential direction of the flat wire motor.

[0015] In an embodiment of the present application, two third flat wires are arranged adjacent to each other on the same side of the first flat wire along the circumferential direction of the flat wire motor, so that the number of winding slots spanned by the two crossing wire segments used to respectively connect the two third flat wires and the inner flat wire connected thereto can be the same, so that the winding arrangement is regular and the winding wire insertion process can be simplified.

[0016] In one embodiment, an inner layer flat wire connected to a first flat wire or a third flat wire and a second flat wire are arranged adjacent to each other in the same winding slot along the radial direction of the flat wire motor.

[0017] In an embodiment of the present application, an inner layer flat wire connected to a first flat wire or a third flat wire and a second flat wire are arranged adjacent to each other in the same winding slot along the radial direction of the flat wire motor, which is beneficial for each turn of the flat wire to traverse the winding slot, thereby facilitating the maintenance of potential balance and avoiding the generation of circulating current.

[0018] In one embodiment, the outer layer flat wire in the first circle of flat wires includes a plurality of second flat wires, which are arranged adjacent to each other in the circumferential direction of the flat wire motor, and the plurality of second flat wires and an inner layer flat wire connected thereto are connected via the same cross-wire segment.

[0019] In an embodiment of the present application, multiple second flat wires are arranged adjacent to each other in the circumferential direction of the flat wire motor, and the multiple second flat wires and an inner layer flat wire connected thereto are connected through the same cross-wire segment, so that the winding routing is arranged regularly and the winding wire insertion process can be simplified.

[0020] In one embodiment, the N circles of flat wire also include a second circle of flat wire, which is arranged adjacent to the first circle of flat wire in the radial direction of the flat wire motor, and the distance between the outer layer of the flat wire in the first circle of flat wire and the axis of the flat wire motor in the radial direction of the flat wire motor is greater than the distance between the outer layer of the flat wire in the second circle of flat wire and the axis of the flat wire motor, and an inner layer of the flat wire in the first circle of flat wire is used to fixedly connect an outer layer of the flat wire in the second circle of flat wire through a cross-line segment.

[0021] In the embodiment of the present application, the distance between the outer layer of the flat wire in the first circle 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 outer layer of the flat wire in the second circle of flat wire and the axis of the flat wire motor, that is, the first circle of flat wire is a circle of flat wire located in the winding slot close to the bottom of the slot.

[0022] In an embodiment of the present application, an inner layer flat wire of the first circle of flat wire is used to fixedly connect an outer layer flat wire of the second circle of flat wire through a cross-line segment, thereby realizing a series connection between the first circle of flat wire and the second circle of flat wire, which is beneficial to realize multi-layer series connection of the winding, beneficial to reduce the eddy current loss of the flat wire, and improve the efficiency of the flat wire motor when running at high speed. It is also beneficial to increase the diversity of the number of series turns of the winding, which is beneficial to improve the performance of the flat wire motor.

[0023] In one embodiment, the length of a line segment between an inner layer flat wire of the first circle of flat wires and an outer layer flat wire of the second circle of flat wires connected thereto is less than or equal to the length of a line segment between a third flat wire of the first circle of flat wires and an inner layer flat wire connected thereto.

[0024] In an embodiment of the present application, the length of a cross-line segment between an inner layer flat wire of the first circle of flat wire and an outer layer flat wire of the second circle of flat wire connected thereto is smaller than the length of a cross-line segment between a third layer flat wire of the first circle of flat wire and an inner layer flat wire connected thereto, which is conducive to forming a short-circuit winding and enabling the winding to achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0025] In an embodiment of the present application, the length of a cross-line segment between an inner layer flat wire of the first circle of flat wire and an outer layer flat wire of the second circle of flat wire connected to it is equal to the length of a cross-line segment between a third flat wire of the first circle of flat wire and an inner layer flat wire connected to it, which is beneficial to reduce the types of cross-line segment lengths and simplify the winding process.

[0026] In one embodiment, the difference between the number of winding slots spanned by a cross-line segment between a third flat wire of the first circle of flat wire and an inner flat wire connected to it and the number of winding slots spanned by a cross-line segment between an inner flat wire of the first circle of flat wire and an outer flat wire of the second circle of flat wire connected to it is 1, 2 or 3.

[0027] In the embodiment of the present application, the difference between the number of winding slots spanned by a cross-line segment between a third flat wire of the first circle of flat wire and an inner layer flat wire connected thereto and the number of winding slots spanned by a cross-line segment between an inner layer flat wire of the first circle of flat wire and an outer layer flat wire of the second circle of flat wire connected thereto is 1, 2 or 3, so that the connection of the flat wires in the winding can have more diverse connection methods, providing more winding routing solutions. It is also beneficial to increase the diversity of the number of turns of the winding series, which is beneficial to improving the performance of the flat wire motor.

[0028] In one embodiment, the outer flat wires in the second circle of flat wires include a first flat wire, a second flat wire and a third flat wire, and the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wires and an inner flat wire connected to it is equal to the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wires and an inner flat wire connected to it.

[0029] In an embodiment of the present application, the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wire and an inner layer flat wire connected to it is equal to the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wire and an inner layer flat wire connected to it, which is beneficial for making the two circles of flat wires in the winding slots have the same cross-wire connection method, thereby making the winding routing more regular and the appearance better, and is also beneficial for simplifying the winding process and facilitating automated winding.

[0030] In one embodiment, the outer flat wires in the second circle of flat wires include a first flat wire, a second flat wire and a third flat wire, and the difference between the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wires and an inner flat wire connected to it and the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wires and an inner flat wire connected to it is 1.

[0031] In an embodiment of the present application, the difference between the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wire and an inner layer flat wire connected to it and the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wire and an inner layer flat wire connected to it is 1, which is beneficial for making the second circle of flat wire in the winding slot and the first flat wire in the first circle of flat wire and an inner layer flat wire connected to it have different spans, thereby facilitating the formation of short-distance windings, and facilitating the realization of continuous short-distance windings in the stator of a motor with multiple circles of flat wires, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0032] In one embodiment, the outer flat wires in the second circle of flat wires include a first flat wire, a second flat wire and a third flat wire, and the difference between the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wires and an inner flat wire connected to it and the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wires and an inner flat wire connected to it is 1.

[0033] In an embodiment of the present application, the difference between the number of winding slots spanned by a cross-wire segment between the first flat wire in the second circle of flat wire and an inner layer flat wire connected to it and the number of winding slots spanned by a cross-wire segment between the first flat wire in the first circle of flat wire and an inner layer flat wire connected to it is 1, which is beneficial for making the second circle of flat wire in the winding slot and the first flat wire in the first circle of flat wire and an inner layer flat wire connected to it have different spans, thereby facilitating the formation of short-distance windings, and facilitating the winding to achieve a continuous short-distance effect in the stator of a motor with multiple circles of flat wires, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0034] 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.

[0035] In the flat wire motor in the embodiment of the present application, the first flat wire, the second flat wire and the third flat wire in the first circle of flat wire in the motor stator of the flat wire motor and the corresponding inner layer flat wires are respectively connected by three span segments of different lengths, so that the winding method of the first circle of flat wire in the winding slot has a variety of spans, which is beneficial to achieve a continuous short-distance effect of the winding in the motor stator with multiple circles of flat wire, 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.

[0036] 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.

[0037] The powertrain in the embodiment of the present application includes a flat wire motor, and the first flat wire, the second flat wire and the third flat wire in the first circle of flat wire in the motor stator of the flat wire motor are connected to the inner flat wires corresponding to each other by three span segments of different lengths, so that the winding method of the first circle of flat wire in the winding slot has a variety of spans, which is beneficial to achieve a continuous short-distance effect of the winding in the motor stator with multiple circles of flat wire, 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 and enhancing the overall performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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.

[0039] Figure 1 is a schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0040] Figure 2 is a schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0041] 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;

[0042] Figure 4 It is a structural schematic diagram of a card issuing coil provided in an embodiment of the present application;

[0043] Figure 5 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

[0044] Figure 6 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

[0045] Figure 7 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

[0046] Figure 8 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

[0047] Fig. 9 This is a connection diagram of a branch of the U-phase winding provided in an embodiment of the present application;

[0048] Fig.10 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

[0049] Fig.11 It is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application;

[0050] Fig.12 is another connection schematic diagram of the three-phase winding ends provided in an embodiment of the present application;

[0051] Fig.13 It is a structural schematic diagram of the welding end of the motor stator in the first embodiment of the present application;

[0052] Fig.14 It is a structural schematic diagram of the crown end of the motor stator in the first embodiment of the present application;

[0053] Fig.15 It is a torque pulsation comparison diagram of the winding peak operating point in Example 1 of the present application. DETAILED DESCRIPTION

[0054] 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.

[0055] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0056] NVH: It is the abbreviation of Noise, Vibration and Harshness, which refers to noise, vibration and acoustic roughness.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] In order to achieve the short-distance effect of a flat wire motor, the present application provides a flat wire motor, the motor stator of the flat wire motor includes a plurality of winding slots and N turns of flat wire, the N turns of flat wire are arranged radially along the flat wire motor, N is an integer greater than or equal to 2, each turn of flat wire includes a plurality of pairs of flat wires arranged circumferentially along the flat wire motor, each winding slot is used to accommodate a pair of flat wires in each turn of the N turns of flat wire, each pair of flat wires includes an outer flat wire and an inner flat wire, along the radial direction of the flat wire motor, the distance between an outer flat wire and the axis of the flat wire motor is greater than the distance between an inner flat wire and the axis of the flat wire motor, and an outer flat wire in each pair of flat wires in each turn of the flat wire is used to connect an inner flat wire in another pair of flat wires. Among them, the N turns of flat wire include a first turn of flat wire, the outer flat wire in the first turn of flat wire includes a first flat wire, a second flat wire and a third flat wire, and the first flat wire, the second flat wire and the third flat wire are connected to the inner flat wires corresponding to them respectively through three cross-wire segments of different lengths. The first flat wire, the second flat wire and the third flat wire in the first circle of flat wire are connected to the corresponding inner layer flat wires through three span segments of different lengths, respectively. This allows the winding method of the first circle of flat wire in the winding slot to have a variety of spans, which is beneficial for achieving a continuous short-distance effect for the winding in the motor stator with multiple circles of flat wire, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0064] Figure 1 It is a schematic diagram of the structure of the electric vehicle 1 provided in an embodiment of the present application.

[0065] 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.

[0066] Figure 2 It is a schematic diagram of the structure of the powertrain 10 provided in an embodiment of the present application.

[0067] In one embodiment, the power assembly 10 includes a flat wire motor 100 and a reducer 200. Figure 2As 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.

[0068] In the embodiment of the present application, the flat wire motor 100 and the reducer 200 are arranged along the motor axis.

[0069] 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 .

[0070] The existing flat wire short-pitch windings with balanced multi-branch in flat wire motors have complex structures, which makes winding processing difficult and winding difficult. In addition, 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 windings are usually only suitable for motor stators with a specific number of winding layers, and the application range is not wide.

[0071] The present application provides a flat wire motor with two parallel branches and a short-distance effect, which can be suitable for even-layer windings. While maximizing and simultaneously weakening 6p and 12p harmonics, it reduces winding AC losses and simplifies the winding insertion process.

[0072] The flat wire motor provided in the embodiments of the present application will be described in detail below.

[0073] Figure 3 1 is a schematic top view of the structure in which the flat wire 121 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 two parallel branches of a U-phase winding provided in an embodiment of the present application, Figure 6 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application, Figure 7 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application, Figure 8 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application, Fig. 9 is a connection diagram of a branch of the U-phase winding provided in an embodiment of the present application, Fig.10 It is a connection diagram of two parallel branches of the U-phase winding provided in an embodiment of the present application.

[0074] 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 9. 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.

[0075] In one embodiment, the motor stator 101 of the flat wire motor 100 includes a flat wire 121 inserted into a winding slot 110. The cross section of the flat wire 121 is rectangular. The flat wires 121 in all the winding slots 110 are connected to form a stator winding. In one embodiment, the flat wire 121 is copper, and the flat wire 121 can also be called a conductor.

[0076] like Figure 3 and Figure 5 As shown, L flat wires 121 may be arranged in each winding slot 110, and the L flat wires 121 are arranged in layers along the radial direction R of the flat wire motor, L=2N, and N is an integer greater than or equal to 2. The 2N flat wires 121 in each winding slot 110 are respectively recorded as L1 layer flat wires, L2 layer flat wires, L3 layer flat wires, ... L(2N-1) layer flat wires, and L(2N) layer flat wires, wherein two adjacent layers of flat wires 121 in each winding slot 110 constitute a pair of flat wires 121, one flat wire 121 of each pair of flat wires 121 is an outer layer flat wire 122, and the other flat wire 121 of each pair of flat wires 121 is an inner layer flat wire 123, and the distance between the outer layer flat wire 122 and the axis of the flat wire motor is greater than the distance between the inner layer flat wire 123 and the axis of the flat wire motor. Two adjacent layers of flat wires 121 in all winding slots 110 constitute a circle of flat wires 120. For example, all L1 layers of flat wires and all L2 layers of flat wires in all winding slots 110 constitute the first circle of flat wires 120a, and all L3 layers of flat wires and all L4 layers of flat wires in all winding slots 110 constitute the second circle of flat wires 120b. And so on, all L(2N-1) layers of flat wires and all L(2N) layers of flat wires in all winding slots 110 constitute the Nth circle of flat wires.

[0077] Each circle of flat wire 120 includes multiple pairs of flat wires 121, and each pair of flat wires 121 of each circle of flat wire 120 includes an outer flat wire 122 and an inner flat wire 123. The outer flat wire 122a of the first circle of flat wire 120a is located at the L1 layer of the winding slot 110, and the inner flat wire 123a of the first circle of flat wire 120a is located at the L2 layer of the winding slot 110. The outer flat wire 122b of the second circle of flat wire 120b is located at the L3 layer of the winding slot 110, and the inner flat wire 123b of the second circle of flat wire 120b is located at the L4 layer of the winding slot 110, and so on. The outer flat wire 122 of the Nth circle of flat wire is located at the L(2N-1) layer of the winding slot 110, and the inner flat wire 123 of the Nth circle of flat wire is located at the L(2N) layer of the winding slot 110.

[0078] 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 121 in each winding slot 110. In one embodiment, L is 8, that is, each winding slot 110 is provided with 8 layers of flat wires, and the 8 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, L7 layer flat wire, and L8 layer flat wire, wherein the L1 layer flat wire is the flat wire 121 located at the bottom of the winding slot 110, and the L8 layer flat wire is the flat wire 121 located at the notch of the winding slot 110.

[0079] like Figure 4 As shown, in one embodiment, the flat wire 121 is a part of the hairpin coil 130. In one embodiment, the hairpin coil 130 includes an insertion wire segment 131 disposed in the winding slot 110 and a cross-wire segment 132 and a welding segment 133 disposed outside the winding slot 110, wherein the insertion wire segment 131 is the flat wire 121 inserted in the winding slot 110. The cross-wire segment 132 may also be referred to as a crown end 132a, and the welding segment 133 may also be referred to as a welding end 133a, and 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 hairpin coil 130 connects the two flat wires 121 through the cross-wire segment 132.

[0080] like Figures 5 to 10As 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 121 refers to the difference in slot numbers of the winding slots 110 where the two flat wires 121 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 121 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 121 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 121 connected by the cross-line segment 132 are located.

[0081] In one embodiment, a motor stator 101 of a flat wire motor 100 includes a plurality of winding slots 110 and N turns of flat wire 120. Figures 5 to 10 As shown, N circles of flat wire 120 are arranged along the radial direction R of the flat wire motor, N is an integer greater than or equal to 2, each circle of flat wire 120 includes multiple pairs of flat wires 121, and the multiple pairs of flat wires 121 in each circle of flat wire 120 are arranged along the circumferential direction C of the flat wire motor, as shown in FIG. Figure 3 As shown, each winding slot 110 is used to accommodate a pair of flat wires 121a in each circle of flat wire 120, and each pair of flat wires 121a includes an outer flat wire 122 and an inner flat wire 123. Along the radial direction R of the flat wire motor, the distance between an outer flat wire 122 and the axis of the flat wire motor 100 is greater than the distance between an inner flat wire 123 and the axis of the flat wire motor 100. An outer flat wire 122 in each pair of flat wires 121 of each circle of flat wire 120 is used to connect an inner flat wire 123 in another pair of flat wires 121. Among them, the N-circle flat wire 120 includes a first circle of flat wire 120a, the outer flat wire 122a in the first circle of flat wire 120a includes a first flat wire 1221, a second flat wire 1222 and a third flat wire 1223, and the first flat wire 1221, the second flat wire 1222 and the third flat wire 1223 and the inner flat wire 123a corresponding to them are connected respectively by three cross-line segments 132 of different lengths.

[0082] In an embodiment of the present application, N circles of flat wire 120 are arranged along the radial direction R of the flat wire motor, N is an integer greater than or equal to 2, and each circle of flat wire 120 includes multiple pairs of flat wires 121. The multiple pairs of flat wires 121 in each circle of flat wire 120 are arranged along the circumferential direction C of the flat wire motor, so that the outer flat wire 122 and the inner flat wire 123 of two adjacent layers in each circle of flat wire 120 can be connected in series, which is beneficial to realize multi-layer series connection of the winding, reduce the eddy current loss of the flat wire, improve the efficiency of the flat wire motor 100 when running at high speed, and also help to 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.

[0083] In the embodiments of the present application, Figure 3 As shown, each winding slot 110 is used to accommodate a pair of flat wires 121a in each circle of flat wire 120, and each pair of flat wires 121a includes an outer flat wire 122 and an inner flat wire 123. Along the radial direction R of the flat wire motor, the distance between an outer flat wire 122 and the axis of the flat wire motor 100 is greater than the distance between an inner flat wire 123 and the axis of the flat wire motor 100, so that the outer flat wire 122a of the first circle of flat wire 120a is located at the bottom slot of the winding slot 110.

[0084] like Figure 5 As shown, the flat wire 121 in the 10th slot 1st layer and the flat wire 121 in the 2nd layer are a pair of flat wires 121a, the flat wire 121 in the 10th slot 1st layer is an outer flat wire 122, and the flat wire 121 in the 10th slot 2nd layer is an inner flat wire 123. Along the radial direction R of the flat wire motor, the distance between the flat wire 121 in the 10th slot 1st layer and the axis of the flat wire motor 100 is greater than the distance between the flat wire 121 in the 10th slot 2nd layer and the axis of the flat wire motor 100.

[0085] In an embodiment of the present application, the outer flat wire 122a in the first circle of flat wire 120a includes a first flat wire 1221, a second flat wire 1222 and a third flat wire 1223. The first flat wire 1221, the second flat wire 1222 and the third flat wire 1223 and the inner flat wire 123a corresponding to them are respectively connected by three cross-wire segments 132 of different lengths, so that the winding method of the first circle of flat wire 120a in the winding slot 110 has a variety of spans, which is beneficial to achieve a continuous short-distance effect of the winding in the motor stator 101 of N circles of flat wire 120, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0086] like Figure 5 and Fig.10 As shown, in the first circle of flat wires 120a, the length of the cross-line segment 132 between the first flat wire 1221 of the 12th slot and the inner layer flat wire 123a of the 19th slot connected thereto, the length of the cross-line segment 132 between the second flat wire 1222 of the 28th slot and the inner layer flat wire 123a of the 37th slot connected thereto, and the length of the cross-line segment 132 between the third flat wire 1223 of the 11th slot and the inner layer flat wire 123a of the 21st slot connected thereto are all different.

[0087] like Figure 6 and Figure 7As shown, in the first circle of flat wires 120a, the length of the cross-line segment 132 between the first flat wire 1221 of the 10th slot and the inner layer flat wire 123a of the 3rd slot connected thereto, the length of the cross-line segment 132 between the second flat wire 1222 of the 28th slot and the inner layer flat wire 123a of the 19th slot connected thereto, and the length of the cross-line segment 132 between the third flat wire 1223 of the 11th slot and the inner layer flat wire 123a of the 1st slot connected thereto are all different.

[0088] like Figure 8 and Fig. 9 As shown, in the first circle of flat wires 120a, the length of the cross-line segment 132 between the first flat wire 1221 of the 10th slot and the inner layer flat wire 123a of the 2nd slot connected thereto, the length of the cross-line segment 132 between the second flat wire 1222 of the 28th slot and the inner layer flat wire 123a of the 18th slot connected thereto, and the length of the cross-line segment 132 between the third flat wire 1223 of the 11th slot and the inner layer flat wire 123a of the 54th slot connected thereto are all different.

[0089] In one embodiment, the difference between the number of winding slots 110 spanned by a cross-line segment 132 connected to the third flat wire 1223 and the number of winding slots 110 spanned by a cross-line segment 132 connected to the second flat wire 1222 is 1, and the difference between the number of winding slots 110 spanned by a cross-line segment 132 connected to the second flat wire 1222 and the number of winding slots 110 spanned by a cross-line segment 132 connected to the first flat wire 1221 is 2.

[0090] In an embodiment of the present application, the number of slots of the winding slot 110 spanned by a cross-line segment 132 connected by the first flat wire 1221, a cross-line segment 132 connected by the second flat wire 1222, and a cross-line segment 132 connected by the third flat wire 1223 are all different, so that the winding method of the flat wire in the winding slot 110 has a variety of spans, which is conducive to making the winding achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0091] like Figure 5 and Fig.10As shown, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot is 10, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 9, and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 12th slot is 7. The difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 1, and the difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 12th slot is 2.

[0092] like Figure 6 and Figure 7 As shown, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot is 10, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 9, and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 10th slot is 7. The difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 1, and the difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 10th slot is 2.

[0093] like Figure 8 and Fig. 9 As shown, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot is 11, the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 10, and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 10th slot is 8. The difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the third flat wire 1223 of the 11th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot is 1, and the difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the second flat wire 1222 of the 28th slot and the number of slots of the winding slots 110 crossed by a cross-line segment 132 of the first flat wire 1221 of the 10th slot is 2.

[0094] In one embodiment, the first flat wire 1221 and an inner flat wire 123 a connected thereto are arranged between the third flat wire 1223 and an inner flat wire 123 a connected thereto.

[0095] In an embodiment of the present application, the first flat wire 1221 and an inner layer flat wire 123a connected thereto are arranged between the third flat wire 1223 and an inner layer flat wire 123a connected thereto, so that the number of winding slots 110 crossed by the cross-line segment 132 connecting the first flat wire 1221 and an inner layer flat wire 123a connected thereto is smaller than the number of winding slots 110 crossed by the cross-line segment 132 connecting the third flat wire 1223 and an inner layer flat wire 123a connected thereto, which is beneficial for forming a short-distance winding, thereby facilitating reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor 100.

[0096] like Figure 5 and Fig.10 As shown, the first flat wire 1221 of the 12th slot and the inner flat wire 123a of the 19th slot connected thereto are arranged between the third flat wire 1223 of the 11th slot and the inner flat wire 123a of the 21st slot connected thereto.

[0097] like Figure 6 and Figure 7 As shown, the first flat wire 1221 of the 10th slot and the inner flat wire 123a of the 3rd slot connected thereto are arranged between the third flat wire 1223 of the 11th slot and the inner flat wire 123a of the 1st slot connected thereto.

[0098] like Figure 8 and Fig. 9 As shown, the first flat wire 1221 of the 10th slot and the inner flat wire 123a of the 2nd slot connected thereto are arranged between the third flat wire 1223 of the 11th slot and the inner flat wire 123a of the 54th slot connected thereto.

[0099] In one embodiment, a first flat wire 1221 and a third flat wire 1223 are arranged adjacent to each other, and a winding slot 110 is spaced between an inner flat wire 123 a connected to a first flat wire 1221 and an inner flat wire 123 a connected to a third flat wire 1223 .

[0100] In an embodiment of the present application, a first flat wire 1221 and a third flat wire 1223 are arranged adjacent to each other, and a winding slot 110 is spaced between an inner layer flat wire 123a connected to the first flat wire 1221 and an inner layer flat wire 123a connected to the third flat wire 1223, so that the number of winding slots 110 crossed by the cross-line segment 132 used to connect the first flat wire 1221 and the inner layer flat wire 123a connected thereto is different from the number of winding slots 110 crossed by the cross-line segment 132 used to connect the third flat wire 1223 and the inner layer flat wire 123a connected thereto, which is beneficial to forming a short-distance winding, thereby facilitating reducing the harmonic winding coefficient and improving the NVH performance of the flat wire motor 100.

[0101] like Figure 5 and Fig.10 As shown, the first flat wire 1221 of the 12th slot and the third flat wire 1223 of the 11th slot are arranged adjacent to each other, and there is a winding slot 110 between the inner flat wire 123a of the 19th slot connected to the first flat wire 1221 of the 12th slot and the inner flat wire 123a of the 21st slot connected to the third flat wire 1223 of the 11th slot.

[0102] like Figure 6 and Figure 7 As shown, the first flat wire 1221 of the 10th slot and the third flat wire 1223 of the 11th slot are arranged adjacent to each other, and there is a winding slot 110 between the inner flat wire 123a of the 3rd slot connected to the first flat wire 1221 of the 10th slot and the inner flat wire 123a of the 1st slot connected to the third flat wire 1223 of the 11th slot.

[0103] like Figure 8 and Fig. 9 As shown, the first flat wire 1221 of the 10th slot and the third flat wire 1223 of the 11th slot are arranged adjacent to each other, and there is a winding slot 110 between the inner flat wire 123a of the 2nd slot connected to the first flat wire 1221 of the 10th slot and the inner flat wire 123a of the 54th slot connected to the third flat wire 1223 of the 11th slot.

[0104] In one embodiment, the outer layer flat wire 122a in the first circle of flat wires 120a includes two third flat wires 1223 , and the two third flat wires 1223 are adjacently arranged along the circumferential direction C of the flat wire motor on the same side of the first flat wire 1221 .

[0105] In an embodiment of the present application, the two third flat wires 1223 are arranged adjacent to each other on the same side of the first flat wire 1221 along the circumferential direction C of the flat wire motor, so that the number of slots of the winding slots 110 crossed by the two crossing wire segments 132 used to respectively connect the two third flat wires 1223 and the inner flat wire 123a connected thereto can be the same, so that the winding arrangement is regular and the winding wire insertion process can be simplified.

[0106] like Figure 5 and Fig.10 As shown, the third flat wire 1223 in the 10th slot and the third flat wire 1223 in the 11th slot in the first circle of flat wire 120a are adjacently arranged along the circumferential direction C of the flat wire motor on the same side of the first flat wire 1221 in the 12th slot.

[0107] like Figures 6 to 9 As shown, the third flat wire 1223 in the 11th slot and the third flat wire 1223 in the 12th slot in the first circle of flat wire 120a are adjacently arranged along the circumferential direction C of the flat wire motor on the same side of the first flat wire 1221 in the 10th slot.

[0108] In one embodiment, an inner layer flat wire 123 a connected to a first flat wire 1221 or a third flat wire 1223 and a second flat wire 1222 are arranged adjacent to each other in the same winding slot 110 along the radial direction R of the flat wire motor.

[0109] In the embodiment of the present application, an inner flat wire 123a connected to a first flat wire 1221 or a third flat wire 1223 and a second flat wire 1222 are arranged adjacent to each other in the same winding slot 110 along the radial direction R of the flat wire motor, which is beneficial for each circle of the flat wire 120 to traverse the winding slot 110, thereby facilitating the maintenance of potential balance and avoiding the generation of circulating current.

[0110] like Figure 5 and Fig.10 As shown, the inner layer flat wire 123a of the 19th slot connected to the first flat wire 1221 of the 12th slot and the second flat wire 1222 of the 19th slot are arranged adjacent to each other in the radial direction R of the flat wire motor in the same winding slot 110. The inner layer flat wire 123a of the 21st slot connected to the third flat wire 1223 of the 11th slot and the second flat wire 1222 of the 21st slot are arranged adjacent to each other in the radial direction R of the flat wire motor in the same winding slot 110.

[0111] In one embodiment, the outer layer flat wire 122a in the first circle of flat wire 120a includes multiple second flat wires 1222, and the multiple second flat wires 1222 are arranged adjacent to each other in sequence along the circumferential direction C of the flat wire motor. The multiple second flat wires 1222 and an inner layer flat wire 123a connected thereto are connected via the same type of cross-wire segment 132.

[0112] In an embodiment of the present application, multiple second flat wires 1222 are arranged adjacent to each other in sequence along the circumferential direction C of the flat wire motor, and the multiple second flat wires 1222 and an inner flat wire 123a connected thereto are connected via the same cross-wire segment 132, so that the winding wiring is arranged regularly and the winding wire insertion process can be simplified.

[0113] like Figure 5 and Fig.10As shown, the second flat wire 1222 of the 28th slot and the inner flat wire 123a of the 37th slot connected thereto, the second flat wire 1222 of the 29th slot and the inner flat wire 123a of the 38th slot connected thereto, and the second flat wire 1222 of the 30th slot and the inner flat wire 123a of the 39th slot connected thereto are connected by the same cross-wire segment 132.

[0114] like Figure 6 and Figure 7 As shown, the second flat wire 1222 of the 28th slot and the inner flat wire 123a of the 19th slot connected thereto, the second flat wire 1222 of the 29th slot and the inner flat wire 123a of the 20th slot connected thereto, and the second flat wire 1222 of the 30th slot and the inner flat wire 123a of the 21st slot connected thereto are connected via the same cross-wire segment 132.

[0115] like Figure 8 and Fig. 9 As shown, the second flat wire 1222 of the 28th slot and the inner flat wire 123a of the 18th slot connected thereto, the second flat wire 1222 of the 29th slot and the inner flat wire 123a of the 19th slot connected thereto, and the second flat wire 1222 of the 30th slot and the inner flat wire 123a of the 20th slot connected thereto are connected via the same cross-wire segment 132.

[0116] In one embodiment, the N-circle flat wire 120 also includes a second circle flat wire 120b, which is arranged adjacent to the first circle flat wire 120a along the radial direction R of the flat wire motor, and the distance between the outer layer flat wire 122a in the first circle 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 outer layer flat wire 122b in the second circle flat wire 120b and the axis of the flat wire motor 100, and an inner layer flat wire 123a of the first circle flat wire 120a is used to fixedly connect an outer layer flat wire 122b of the second circle flat wire 120b through a cross-line segment 132.

[0117] In the embodiment of the present application, along the radial direction R of the flat wire motor, the distance between the outer flat wire 122a in the first circle of flat wire 120a and the axis of the flat wire motor 100 is greater than the distance between the outer flat wire 122b in the second circle of flat wire 120b and the axis of the flat wire motor 100, that is, the first circle of flat wire 120a is a circle of flat wire located in the winding slot 110 near the bottom of the slot.

[0118] In the embodiment of the present application, an inner layer flat wire 123a of the first circle flat wire 120a is used to fixedly connect an outer layer flat wire 122b of the second circle flat wire 120b through a cross-line segment 132, thereby realizing the series connection of the first circle flat wire 120a and the second circle flat wire 120b, which is beneficial to realize multi-layer series connection of the winding, reduce the eddy current loss of the flat wire, 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.

[0119] like Figure 5 As shown, the inner flat wire 123a of the third groove in the first circle of flat wire 120a is used to be fixedly connected to the outer flat wire 122b of the eleventh groove in the second circle of flat wire 120b through a cross-wire segment 132.

[0120] like Figure 6 and Figure 7 As shown, the inner flat wire 123a of the 19th groove in the first circle of flat wires 120a is used to be fixedly connected to the outer flat wire 122b of the 10th groove in the second circle of flat wires 120b through a cross-wire segment 132.

[0121] like Figure 8 and Fig. 9 As shown, the inner flat wire 123a of the 18th groove in the first circle of flat wires 120a is used to be fixedly connected to the outer flat wire 122b of the 10th groove in the second circle of flat wires 120b through a cross-wire segment 132.

[0122] like Fig.10 As shown, the inner flat wire 123a of the first groove in the first circle of flat wires 120a is used to be fixedly connected to the outer flat wire 122b of the tenth groove in the second circle of flat wires 120b through a cross-wire segment 132.

[0123] In one embodiment, the length of a cross-line segment 132 between an inner flat wire 123a of the first circle of flat wire 120a and an outer flat wire 122b of the second circle of flat wire 120b connected thereto is less than or equal to the length of a cross-line segment 132 between a third flat wire 1223 of the first circle of flat wire 120a and an inner flat wire 123a connected thereto.

[0124] In the embodiment of the present application, the length of a cross-line segment 132 between an inner layer flat wire 123a of the first circle of flat wire 120a and an outer layer flat wire 122b of the second circle of flat wire 120b connected thereto is less than the length of a cross-line segment 132 between a third flat wire 1223 of the first circle of flat wire 120a and an inner layer flat wire 123a connected thereto, which is conducive to forming a short-circuit winding and enabling the winding to achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0125] like Figure 5 As shown, the number of winding slots 110 crossed by the cross-line segment 132 between the inner flat wire 123a of the 3rd slot in the first circle of flat wire 120a and the outer flat wire 122b of the 11th slot in the second circle of flat wire 120b connected thereto is 8, and the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 10th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 20th slot connected thereto is 10. Therefore, the length of the cross-line segment 132 between the inner flat wire 123a of the 3rd slot in the first circle of flat wire 120a and the outer flat wire 122b of the 11th slot in the second circle of flat wire 120b connected thereto is less than the length of the cross-line segment 132 between the third flat wire 1223 of the 10th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 20th slot connected thereto.

[0126] like Figure 6 and Figure 7 As shown, the number of winding slots 110 crossed by the cross-line segment 132 between the inner flat wire 123a of the 19th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle of flat wire 120b connected thereto is 9, and the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 11th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 1st slot connected thereto is 10. Therefore, the length of the cross-line segment 132 between the inner flat wire 123a of the 19th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle of flat wire 120b connected thereto is less than the length of the cross-line segment 132 between the third flat wire 1223 of the 11th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 1st slot connected thereto.

[0127] like Figure 8 and Fig. 9 As shown, the number of winding slots 110 crossed by the cross-line segment 132 between the inner flat wire 123a of the 18th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle of flat wire 120b connected thereto is 8, and the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 11th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 54th slot connected thereto is 11. Therefore, the length of the cross-line segment 132 between the inner flat wire 123a of the 18th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle of flat wire 120b connected thereto is less than the length of the cross-line segment 132 between the third flat wire 1223 of the 11th slot in the first circle of flat wire 120a and the inner flat wire 123a of the 54th slot connected thereto.

[0128] In an embodiment of the present application, the length of a cross-line segment 132 between an inner layer flat wire 123a of the first circle of flat wire 120a and an outer layer flat wire 122b of the second circle of flat wire 120b connected thereto is equal to the length of a cross-line segment 132 between a third flat wire 1223 of the first circle of flat wire 120a and an inner layer flat wire 123a connected thereto, which is beneficial to reduce the types of cross-line segment 132 lengths and simplify the winding process.

[0129] like Fig.10 As shown, the number of winding slots 110 spanned by the cross-line segment 132 between the inner flat wire 123a of the 10th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 20th slot in the second circle of flat wire 120b connected thereto is 10, and the number of winding slots 110 spanned by the cross-line segment 132 between the third flat wire 1223 of the 1st slot in the first circle of flat wire 120a and the inner flat wire 123a of the 11th slot connected thereto is 10. Therefore, the length of the cross-line segment 132 between the inner flat wire 123a of the 10th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 20th slot in the second circle of flat wire 120b connected thereto is equal to the length of the cross-line segment 132 between the third flat wire 1223 of the 1st slot in the first circle of flat wire 120a and the inner flat wire 123a of the 11th slot connected thereto.

[0130] In one embodiment, the difference between the number of winding slots 110 spanned by a cross-line segment 132 between a third flat wire 1223 of the first circle of flat wire 120a and an inner flat wire 123a connected thereto and the number of winding slots 110 spanned by a cross-line segment 132 between an inner flat wire 123a of the first circle of flat wire 120a and an outer flat wire 122b of the second circle of flat wire 120b connected thereto is 1, 2 or 3.

[0131] In the embodiment of the present application, the difference between the number of slots of the winding slot 110 crossed by a cross-line segment 132 between a third flat wire 1223 of the first circle flat wire 120a and an inner layer flat wire 123a connected thereto and the number of slots of the winding slot 110 crossed by a cross-line segment 132 between an inner layer flat wire 123a of the first circle flat wire 120a and an outer layer flat wire 122b of the second circle flat wire 120b connected thereto is 1, 2 or 3, so that the connection of the flat wire 121 in the winding can have more diverse connection methods, providing more winding routing solutions. It is also beneficial to increase the diversity of the number of turns of the winding series, which is beneficial to improve the performance of the flat wire motor 100.

[0132] like Figure 6 and Figure 7As shown, the number of winding slots 110 crossed by the cross-line segment 132 between the inner layer flat wire 123a of the 19th slot in the first circle flat wire 120a and the outer layer flat wire 122b of the 10th slot in the second circle flat wire 120b connected thereto is 9, and the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 11th slot in the first circle flat wire 120a and the inner layer flat wire 123a of the 1st slot connected thereto is 1. 0, the difference between the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 11th slot of the first circle of flat wire 120a and the inner flat wire 123a of the 1st slot connected thereto and the number of winding slots 110 crossed by the cross-line segment 132 between the inner flat wire 123a of the 19th slot in the first circle of flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle of flat wire 120b connected thereto is 1.

[0133] like Figure 5 As shown, the number of winding slots 110 crossed by the cross-wire segment 132 between the inner layer flat wire 123a of the third slot in the first circle flat wire 120a and the outer layer flat wire 122b of the 11th slot in the second circle flat wire 120b connected thereto is 8, and the number of winding slots 110 crossed by the cross-wire segment 132 between the third flat wire 1223 of the 10th slot in the first circle flat wire 120a and the inner layer flat wire 123a of the 20th slot connected thereto is 1. 0, the difference between the number of winding slots 110 crossed by the crossing segment 132 between the third flat wire 1223 of the 10th slot of the first circle of flat wire 120a and the inner flat wire 123a of the 20th slot connected thereto and the number of winding slots 110 crossed by the crossing segment 132 between the inner flat wire 123a of the 3rd slot in the first circle of flat wire 120a and the outer flat wire 122b of the 11th slot in the second circle of flat wire 120b connected thereto is 2.

[0134] like Figure 8 and Fig. 9 As shown, the number of winding slots 110 crossed by the cross-wire segment 132 between the inner layer flat wire 123a of the 18th slot in the first circle flat wire 120a and the outer layer flat wire 122b of the 10th slot in the second circle flat wire 120b connected thereto is 8, and the number of winding slots 110 crossed by the cross-wire segment 132 between the third flat wire 1223 of the 11th slot in the first circle flat wire 120a and the inner layer flat wire 123a of the 54th slot connected thereto is 1. 1. The difference between the number of winding slots 110 crossed by the cross-line segment 132 between the third flat wire 1223 of the 11th slot of the first circle flat wire 120a and the inner flat wire 123a of the 54th slot connected thereto and the number of winding slots 110 crossed by the cross-line segment 132 between the inner flat wire 123a of the 18th slot in the first circle flat wire 120a and the outer flat wire 122b of the 10th slot in the second circle flat wire 120b connected thereto is 3.

[0135] In one embodiment, the outer flat wire 122b in the second circle of flat wires 120b includes a first flat wire 1224, a second flat wire 1225 and a third flat wire 1226, and the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wires 120a and an inner flat wire 123a connected thereto is equal to the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wires 120b and an inner flat wire 123b connected thereto.

[0136] In the embodiment of the present application, the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wire 120a and an inner flat wire 123a connected thereto is equal to the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wire 120b and an inner flat wire 123b connected thereto, which is beneficial for making the two circles of flat wires 120a and 120b in the winding slot 110 have the same cross-line connection method, thereby making the winding routing more regular and the appearance better, and also helping to simplify the winding process and facilitate automated winding.

[0137] like Figure 5 As shown, the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 1221 of the 12th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 19th slot connected thereto is 7, and the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 1224 of the 11th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 18th slot connected thereto is 7, and the number of winding slots 110 crossed by the crossing line segments 132 of both are the same.

[0138] like Figure 6 As shown, the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 1221 of the 10th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 3rd slot connected thereto is 7, and the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 1224 of the 9th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 2nd slot connected thereto is 7, and the number of winding slots 110 crossed by the crossing line segments 132 of both are the same.

[0139] like Figure 8 and Fig. 9As shown, the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 1221 of the 10th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 2nd slot connected thereto is 8, and the number of winding slots 110 crossed by a crossing line segment 132 between the first flat wire 12241 of the 9th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 1st slot connected thereto is 8, and the number of winding slots 110 crossed by the crossing line segments 132 of both are the same.

[0140] In one embodiment, the outer flat wire 122 in the second circle of flat wire 120b includes a first flat wire 1224, a second flat wire 1225 and a third flat wire 1226, and the difference between the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wire 120a and an inner flat wire 123a connected thereto and the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wire 120b and an inner flat wire 123b connected thereto is 1.

[0141] In the embodiment of the present application, the difference between the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wire 120a and an inner layer flat wire 123a connected thereto and the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wire 120b and an inner layer flat wire 123b connected thereto is 1, which is beneficial for making the second circle of flat wire 120b in the winding slot 110 and the first flat wire 1221 in the first circle of flat wire 120a and an inner layer flat wire 123a connected thereto have different spans, thereby facilitating the formation of short-distance windings, and facilitating the winding to achieve a continuous short-distance effect in the motor stator 101 of multiple circles of flat wire 120, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0142] like Fig.10 As shown, the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1221 of the 12th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 19th slot connected thereto is 7, the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1224 of the 12th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 18th slot connected thereto is 6, and the difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1221 of the 12th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 19th slot connected thereto and the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1224 of the 12th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 18th slot connected thereto is 1.

[0143] In one embodiment, the outer flat wire 122 in the second circle of flat wire 120b includes a first flat wire 1224, a second flat wire 1225 and a third flat wire 1226, and the difference between the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wire 120b and an inner flat wire 123b connected thereto and the number of winding slots 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wire 120a and an inner flat wire 123a connected thereto is 1.

[0144] In the embodiment of the present application, the difference between the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1224 in the second circle of flat wire 120b and an inner layer flat wire 123b connected thereto and the number of slots of the winding slot 110 spanned by a cross-line segment 132 between the first flat wire 1221 in the first circle of flat wire 120a and an inner layer flat wire 123a connected thereto is 1, which is beneficial for making the second circle of flat wire 120b in the winding slot 110 and the first flat wire 1224 in the first circle of flat wire 120a and an inner layer flat wire 123b connected thereto have different spans, thereby facilitating the formation of short-distance windings, and facilitating the winding to achieve a continuous short-distance effect in the motor stator 101 of multiple circles of flat wire 120, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0145] like Figure 7 As shown, the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1221 of the 10th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 3rd slot connected thereto is 7, the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1224 of the 10th slot in the second circle of flat wires 120b and the inner flat wire 123b of the 2nd slot connected thereto is 8, and the difference between the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1224 of the 10th slot in the second circle of flat wires 120b and the number of slots of the winding slots 110 crossed by a cross-line segment 132 between the first flat wire 1221 of the 10th slot in the first circle of flat wires 120a and the inner flat wire 123a of the 3rd slot connected thereto is 1.

[0146] 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, p represents the number of pole pairs, and the number of slots per pole per phase is q=3, where q=Z / (2mp).

[0147] In one embodiment, L layers of flat wires 121 are arranged in each winding slot 110 , L is an even number, L=2N, N is an integer greater than or equal to 2, and the number of parallel branches=1 or 2 or 4.

[0148] 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 121 are divided into one group, the T2 layer flat wires 121 are divided into one group, and the T3 layer flat wires 121 are divided into another group. The T2 layer flat wires 121 are offset by one winding slot 110 relative to the T1 layer flat wires 121 along the circumferential direction C of the flat wire motor clockwise, and the T3 layer flat wires 121 are offset by another winding slot 110 relative to the T2 layer flat wires 121 along the same circumferential direction, so that the winding achieves a continuous short-distance effect.

[0149] In one embodiment, the hairpin coil 130 is connected across the 1 / 2 layer, 3 / 4 layer, 5 / 6 layer, ..., L-1 layer / L layer.

[0150] In one embodiment, the adjacent layers of hairpin coils 130 include three spans, Z / 2p, Z / 2p+1, Z / 2p-q+1 or Z / 2p-1, Z / 2p, Z / 2p-q or Z / 2p+1, Z / 2p+2, Z / 2p-q+2. Z / 2p refers to the span of the whole pitch. 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-line segments of the two adjacent layers of hairpin coils 130, which is also the difference in slot numbers of the winding slots 110 where the two flat wires 121 of the hairpin coils 130 are located.

[0151] In one embodiment, the total number of types of hairpin coils 130 is 3*L / 2.

[0152] In one embodiment, the welding layer span is Z / 2p or Z / 2p-1 or Z / 2p+1. The span of two adjacent welding layers refers to the number of winding slots 110 spanned by the adjacent welding layers, and is also the difference in the slot numbers of the winding slots 110 where two flat wires 121 connected by two welding segments 133 welded to each other in adjacent layers are located.

[0153] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Y-type manner.

[0154] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Δ-type manner.

[0155] In the embodiment of the present application, the winding arrangement is applicable to both even layers with L / 2=odd number and even layers with L / 2=even number, which broadens the flexibility of winding design. Multiple flat wire groups are staggered by 1 winding slot 110, 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 121 in each parallel sub-winding of each phase are evenly distributed at different layers in each winding slot 110. 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 lead wires of each phase are located on the 1st layer or the Lth layer, which can make full use of the radial space and simplify the Busbar structure. The hairpin coils 130 on each layer are independent of each other, and there are no additional cross-layer hairpin coils 130. Fully automatic wiring can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0156] In the embodiment of the present application, the 1st / 2nd layer of flat wires constitutes the first circle of flat wires, the 3rd / 4th layer of flat wires constitutes the second circle of flat wires, and so on, the 5th / 6th layer of flat wires constitutes the third circle of flat wires, and the L-1th layer / Lth layer constitutes the Nth circle of flat wires.

[0157] Fig.11 is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application, Fig.12 This is another connection diagram of the three-phase winding ends provided in an embodiment of the present application.

[0158] 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 set for each phase winding is 2. Fig.11 As shown, the three-phase windings of the stator winding are respectively composed of two parallel circuits, the two parallel branches of the U-phase winding are marked as U1 and U2, the two parallel branches of the V-phase winding are marked as V1 and V2, and the two parallel branches of the W-phase winding are marked as W1 and W2. The ends of the U-phase, V-phase and W-phase are connected in a Y-type manner. In another embodiment, as Fig.12 As shown, the three-phase windings of the stator winding are respectively composed of two parallel circuits, and the ends of the U phase, V phase and W phase are connected in a Δ-type manner.

[0159] 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.

[0160] exist Figures 5 to 10 The winding structure is described as follows: Figures 7 to 10 The first row is the slot number of the winding slot, the first column is the layer number of the flat wire in each winding slot, and the Figure 5For example, the motor stator has 54 winding slots, and each winding slot can have 8 layers. The first layer is the flat wire located at the bottom of the winding slot, and the eighth layer is the flat wire located at the slot mouth of the winding slot. "-" 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 Represents the tail lead of the second parallel branch. It should be noted that Figures 5 to 10 The phase band distribution in the figure is only for illustration. Figures 5 to 10 The "+" and "-" symbols in Figures 5 to 10 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.

[0161] 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 are 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 2. Figure 5 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0162] like Figure 5 and Figure 3 As shown, each winding slot contains L=8 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 and the eighth layer is L8. The first layer is the bottom layer of the winding slot, and the eighth layer is the slot opening layer.

[0163] 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 8 layers of flat wires are divided into 3 groups, T1, T2, and T3 are 2, 4, and 2 respectively, that is, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th / 6th layer of flat wires, and T3 contains the 7th / 8th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by another winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor, so that the winding can achieve a continuous short distance effect. The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0164] For example, the lead-out line at the head end of the first sub-branch of the first branch of the U phase starts from the first layer of the 12th slot. After connecting all the flat wires belonging to the first branch on the 1 / 2 layers, the lead-out line at the tail end is led out from the second layer of the 3rd slot. In this process, three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0165] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 11th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layers, the lead-out line at the tail end is led out from the 4th layer of the 2nd slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0166] The lead-out line at the head end of the third sub-branch of the U phase starts from the 5th layer of the 11th slot. After connecting all the flat wires belonging to the first branch on the 5th / 6th layer, the lead-out line at the tail end is led out from the 6th layer of the 2nd slot. Three types of span hairpin coils are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0167] The lead-out line at the head end of the fourth sub-branch of the U phase starts from the 7th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 7th / 8th layer, the lead-out line at the tail end is led out from the 8th layer of the 1st slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0168] Based on the four sub-branches of the first branch, it can be known that there are 3*L / 2=12 types of card issuing coils in total.

[0169] The first, second, third and fourth sub-branches of the second branch of the U phase can be arranged with reference to the first branch of the U phase, and will not be described in detail here.

[0170] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first, second, third, and fourth sub-branch coils. The spans of the cross-layer cross-line segments between layers can be equal or not. In this application, Figure 5 In the embodiment 1 shown, the span of the cross-layer and cross-line segments from the 2nd layer to the 3rd layer and from the 6th layer to the 7th layer is Z / 2p-1=8, and the span of the 4th layer to the 5th layer is Z / 2p=9. In addition to the cross-layer and cross-line segments, the welding end span of each sub-branch is the same. Figure 5 In the first embodiment shown, Z / 2p=9, which can simplify the twisting, welding and coating processes.

[0171] like Figure 5As 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.

[0172] 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.

[0173] Combine the following Figure 5 The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figure 5 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.

[0174] like Figure 5 As shown, the first branch of the first branch of the U phase starts at the first layer of the 12th slot as the incoming line terminal U 1in , enter from the 1st layer of the 12th slot, exit from the 2nd layer of the 19th slot, then enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 37th slot, then enter from the 1st layer of the 46th slot, exit from the 2nd layer of the 1st slot, then enter from the 1st layer of the 10th slot, exit from the 2nd layer of the 20th slot, then enter from the 1st layer of the 29th slot, exit from the 2nd layer of the 38th slot, then enter from the 1st layer of the 47th slot, exit from the 2nd layer of the 2nd slot, then enter from the 1st layer of the 11th slot, exit from the 2nd layer of the 21st slot, then enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 39th slot, then enter from the 1st layer of the 48th slot, exit from the 2nd layer of the 3rd slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0175] The lead-out line at the head end of the second sub-branch of the first branch of the U phase starts at the 3rd layer of slot 11, enters from the 3rd layer of slot 11, exits from the 4th layer of slot 18, then enters from the 3rd layer of slot 27, exits from the 4th layer of slot 36, then enters from the 3rd layer of slot 45, exits from the 4th layer of slot 54, then enters from the 3rd layer of slot 9, exits from the 4th layer of slot 19, then enters from the 3rd layer of slot 28, exits from the 4th layer of slot 37, then enters from the 3rd layer of slot 46, exits from the 4th layer of slot 1, then enters from the 3rd layer of slot 10, exits from the 4th layer of slot 20, then enters from the 3rd layer of slot 29, exits from the 4th layer of slot 38, then enters from the 3rd layer of slot 47, exits from the 4th layer of slot 2, thus completing the traversal of the 3rd and 4th layer flat wires.

[0176] The lead-out line at the head end of the third sub-branch of the first branch of phase U starts at the 5th layer of slot 11, enters from the 5th layer of slot 11, exits from the 6th layer of slot 18, then enters from the 5th layer of slot 27, exits from the 6th layer of slot 36, then enters from the 5th layer of slot 45, exits from the 6th layer of slot 54, then enters from the 5th layer of slot 9, exits from the 6th layer of slot 19, then enters from the 5th layer of slot 28, exits from the 6th layer of slot 37, then enters from the 5th layer of slot 46, exits from the 6th layer of slot 1, then enters from the 5th layer of slot 10, exits from the 6th layer of slot 20, then enters from the 5th layer of slot 29, exits from the 6th layer of slot 38, then enters from the 5th layer of slot 47, exits from the 6th layer of slot 2, thus completing the traversal of the 5th and 6th layer flat wires.

[0177] The lead-out line at the head end of the fourth sub-branch of the first branch of the U phase starts at the 7th layer of slot 10, enters from the 7th layer of slot 10, exits from the 8th layer of slot 17, then enters from the 7th layer of slot 26, exits from the 8th layer of slot 35, then enters from the 7th layer of slot 44, exits from the 8th layer of slot 53, then enters from the 7th layer of slot 8, exits from the 8th layer of slot 18, then enters from the 7th layer of slot 27, exits from the 8th layer of slot 36, then enters from the 7th layer of slot 45, exits from the 8th layer of slot 54, then enters from the 7th layer of slot 9, exits from the 8th layer of slot 19, then enters from the 7th layer of slot 28, exits from the 8th layer of slot 37, then enters from the 7th layer of slot 46, exits from the 8th layer of slot 1, thus completing the traversal of the 7th and 8th layers of flat wires.

[0178] At this point, the 8th layer of the 1st slot is led out to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0179] like Figure 5 As shown in the figure, the first sub-branch lead-out line of the second branch of phase U starts from the 8th layer of slot 10 as the incoming line terminal U 2in, enter from the 8th layer of the 10th slot, exit from the 7th layer of the 54th slot, then enter from the 8th layer of the 45th slot, exit from the 7th layer of the 36th slot, then enter from the 8th layer of the 27th slot, exit from the 7th layer of the 18th slot, then enter from the 8th layer of the 9th slot, exit from the 7th layer of the 53rd slot, then enter from the 8th layer of the 44th slot, exit from the 7th layer of the 35th slot, then enter from the 8th layer of the 26th slot, exit from the 7th layer of the 17th slot, then enter from the 8th layer of the 8th slot, exit from the 7th layer of the 8th slot, exit from the 7th layer of the 1st slot, then enter from the 8th layer of the 46th slot, exit from the 7th layer of the 37th slot, then enter from the 8th layer of the 28th slot, exit from the 7th layer of the 19th slot, thus completing the traversal of the 7th and 8th layer flat wires.

[0180] The lead-out line at the head end of the second sub-branch of the second branch of the U phase starts at the 6th layer of slot 11, enters from the 6th layer of slot 11, exits from the 5th layer of slot 1, then enters from the 6th layer of slot 46, exits from the 5th layer of slot 37, then enters from the 6th layer of slot 28, exits from the 5th layer of slot 19, then enters from the 6th layer of slot 10, exits from the 5th layer of slot 54, then enters from the 6th layer of slot 45, exits from the 5th layer of slot 36, then enters from the 6th layer of slot 27, exits from the 5th layer of slot 18, then enters from the 6th layer of slot 9, exits from the 5th layer of slot 2, then enters from the 6th layer of slot 47, exits from the 5th layer of slot 38, then enters from the 6th layer of slot 29, exits from the 5th layer of slot 20, thus completing the traversal of the 5th and 6th layer flat wires.

[0181] The lead-out line at the head end of the third sub-branch of the second branch of the U phase starts at the 4th layer of slot 11, enters from the 4th layer of slot 11, exits from the 3rd layer of slot 1, then enters from the 4th layer of slot 46, exits from the 3rd layer of slot 37, then enters from the 4th layer of slot 28, exits from the 3rd layer of slot 19, then enters from the 4th layer of slot 10, exits from the 3rd layer of slot 54, then enters from the 4th layer of slot 45, exits from the 3rd layer of slot 36, then enters from the 4th layer of slot 27, exits from the 3rd layer of slot 18, then enters from the 4th layer of slot 9, exits from the 3rd layer of slot 2, then enters from the 4th layer of slot 47, exits from the 3rd layer of slot 38, then enters from the 4th layer of slot 29, exits from the 3rd layer of slot 20, thus completing the traversal of the 3rd and 4th layer flat wires.

[0182] The lead-out line at the head end of the fourth sub-branch of the second branch of the U-phase starts at the 2nd layer of slot 12, enters from the 2nd layer of slot 12, exits from the 1st layer of slot 2, then enters from the 2nd layer of slot 47, exits from the 1st layer of slot 38, then enters from the 2nd layer of slot 29, exits from the 1st layer of slot 20, then enters from the 2nd layer of slot 11, exits from the 1st layer of slot 1, then enters from the 2nd layer of slot 46, exits from the 1st layer of slot 37, then enters from the 2nd layer of slot 28, exits from the 1st layer of slot 19, then enters from the 2nd layer of slot 10, exits from the 1st layer of slot 3, then enters from the 2nd layer of slot 48, exits from the 1st layer of slot 39, then enters from the 2nd layer of slot 30, exits from the 1st layer of slot 21, thus completing the traversal of the 1st and 2nd layer flat wires.

[0183] At this point, the first layer of the 21st slot is led out to form the outlet terminal U of the second branch of the U-phase winding. 2out .

[0184] 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 It can be obtained by translating based on the second branch of the U phase.

[0185] Fig.13 is a schematic structural diagram of the welding end of the motor stator in the first embodiment of the present application, Fig.14 It is a structural schematic diagram of the crown end of the motor stator in Example 1 of the present application.

[0186] like Fig.13 and Fig.14 As shown, the windings in the first embodiment of the present application are arranged neatly, the lead wires of each phase are at the welding end, and are all in the 1st layer or the Lth layer, thereby simplifying the busbar structure design.

[0187] Table 1. Example 1, comparison table of harmonic winding coefficients of conventional full-pitch winding and traditional short-pitch winding

[0188]

[0189] As shown in Table 1, the harmonic order is 1, which indicates the fundamental wave. The 5th, 7th, 11th and 13th harmonic winding coefficients of the conventional short-pitch winding 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 0.0899, 0.0207, 0.0207 and 0.0899 respectively. Figure 5The 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 0.9209 is not much lower than 0.9598 of the full-pitch winding, and is relatively close.

[0190] 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 0.0207, the 7th and 11th harmonic winding coefficients of the conventional short-pitch winding with a pitch of 7 are 0.1359, and the present application is as follows Figure 5 The 7th and 11th harmonic winding coefficients of the continuous short-pitch winding in the embodiment 1 shown are much lower than those of 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 embodiment 1 shown are 0.0899, 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 of the first embodiment shown is 0.9019, 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.

[0191] Fig.15 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.

[0192] like Fig.15 As shown, curve A represents Figure 5 The torque waveform of the continuous short-pitch winding in the first embodiment shown in the figure, 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, and the torque pulsation is relatively large. 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 illustrated embodiment 1 is smaller than that of the conventional full-pitch winding and the conventional short-pitch winding.

[0193] 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 are 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 2. Figure 6 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0194] like Figure 6and Figure 3 As shown, each winding slot contains L=8 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 and the eighth layer is L8. The first layer is the bottom layer of the winding slot, and the eighth layer is the slot opening layer.

[0195] 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 8 layers of flat wires are divided into 3 groups, T1, T2, and T3 are 2, 4, and 2 respectively, that is, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th / 6th layer of flat wires, and T3 contains the 7th / 8th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by another winding slot relative to the flat wires of the T2 layer in the same direction of the circumference of the flat wire motor, so that the winding can achieve a continuous short distance effect.

[0196] The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0197] For example, the lead-out line at the head end of the first sub-branch of the first branch of the U phase starts from the first layer of the 10th slot. After connecting all the flat wires belonging to the first branch on the 1 / 2 layers, the lead-out line at the tail end is led out from the second layer of the 19th slot. In this process, three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0198] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layer, the lead-out line at the tail end is led out from the 4th layer of the 19th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0199] The lead-out line at the head end of the third sub-branch of the U phase starts from the 5th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 5th / 6th layer, the lead-out line at the tail end is led out from the 6th layer of the 19th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0200] The lead-out line at the head end of the fourth sub-branch of the U phase starts from the 7th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 7th / 8th layer, the lead-out line at the tail end is led out from the 8th layer of the 19th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0201] Based on the four sub-branches of the first branch, it can be known that there are 3*L / 2=12 types of card issuing coils in total.

[0202] The first, second, third and fourth sub-branches of the second branch of the U phase can be arranged with reference to the first branch of the U phase, and will not be described in detail here.

[0203] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first, second, third, and fourth sub-branch coils. The spans of the cross-layer cross-line segments between layers can be equal or not. In this application, Figure 6 In the second embodiment shown, the span of the cross-layer and cross-line segments from layer 2 to layer 3, layer 4 to layer 5, and layer 6 to layer 7 is Z / 2p=9. The welding end span of each sub-branch is the same. Figure 6 In the second embodiment shown, Z / 2p=9, which simplifies the twisting, welding and coating processes.

[0204] 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, which will not be described in detail herein.

[0205] 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.

[0206] Combine the following Figure 6 The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figure 5 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.

[0207] like Figure 6 As shown in the figure, the first branch of the first branch of the U phase starts from the first layer of the 10th slot as the incoming line terminal U 1in , enter from the 1st layer of the 10th slot, exit from the 2nd layer of the 3rd slot, then enter from the 1st layer of the 48th slot, exit from the 2nd layer of the 39th slot, then enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 21st slot, then enter from the 1st layer of the 12th slot, exit from the 2nd layer of the 2nd slot, then enter from the 1st layer of the 47th slot, exit from the 2nd layer of the 38th slot, then enter from the 1st layer of the 29th slot, exit from the 20th slot, then enter from the 1st layer of the 11th slot, exit from the 2nd layer of the 1st slot, then enter from the 1st layer of the 46th slot, exit from the 2nd layer of the 37th slot, then enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 19th slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0208] The lead-out line at the head end of the second sub-branch of the first branch of the U phase starts at the 3rd layer of the 10th slot, enters from the 3rd layer of the 10th slot, exits from the 4th layer of the 54th slot, then enters from the 3rd layer of the 45th slot, exits from the 4th layer of the 36th slot, then enters from the 3rd layer of the 27th slot, exits from the 4th layer of the 18th slot, then enters from the 3rd layer of the 9th slot, exits from the 4th layer of the 2nd slot, then enters from the 3rd layer of the 47th slot, exits from the 4th layer of the 38th slot, then enters from the 3rd layer of the 29th slot, exits from the 4th layer of the 20th slot, then enters from the 3rd layer of the 11th slot, exits from the 4th layer of the 1st slot, then enters from the 3rd layer of the 46th slot, exits from the 4th layer of the 37th slot, then enters from the 3rd layer of the 28th slot, exits from the 4th layer of the 19th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0209] The lead-out line at the head end of the third sub-branch of the first branch of the U phase starts at the 5th layer of slot 10, enters from the 5th layer of slot 10, exits from the 6th layer of slot 54, then enters from the 5th layer of slot 45, exits from the 6th layer of slot 36, then enters from the 5th layer of slot 27, exits from the 6th layer of slot 18, then enters from the 5th layer of slot 9, exits from the 6th layer of slot 2, then enters from the 5th layer of slot 47, exits from the 6th layer of slot 38, then enters from the 5th layer of slot 29, exits from the 6th layer of slot 20, then enters from the 5th layer of slot 11, exits from the 6th layer of slot 1, then enters from the 5th layer of slot 46, exits from the 6th layer of slot 37, then enters from the 5th layer of slot 28, exits from the 6th layer of slot 19, thus completing the traversal of the 5th and 6th layer flat wires.

[0210] The lead-out line at the head end of the fourth sub-branch of the first branch of the U phase starts at the 7th layer of slot 10, enters from the 7th layer of slot 10, exits from the 8th layer of slot 54, then enters from the 7th layer of slot 45, exits from the 8th layer of slot 36, then enters from the 7th layer of slot 27, exits from the 8th layer of slot 18, then enters from the 7th layer of slot 9, exits from the 8th layer of slot 53, then enters from the 7th layer of slot 44, exits from the 8th layer of slot 35, then enters from the 7th layer of slot 26, exits from the 8th layer of slot 17, then enters from the 7th layer of slot 8, exits from the 8th layer of slot 1, then enters from the 7th layer of slot 46, exits from the 8th layer of slot 37, then enters from the 7th layer of slot 28, and exits from the 8th layer of slot 19, thus completing the traversal of the 7th and 8th layer flat wires.

[0211] At this point, the 8th layer of the 1st slot is led out to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0212] like Figure 6 As shown in the figure, the first sub-branch lead-out line of the second branch of phase U starts from the 8th layer of slot 10 as the incoming line terminal U 2in, enter from the 8th layer of the 10th slot, exit from the 7th layer of the 19th slot, then enter from the 8th layer of the 28th slot, exit from the 7th layer of the 37th slot, then enter from the 8th layer of the 46th slot, exit from the 7th layer of the 53rd slot, then enter from the 8th layer of the 8th slot, exit from the 7th layer of the 17th slot, then enter from the 8th layer of the 26th slot, exit from the 7th layer of the 35th slot, then enter from the 8th layer of the 44th slot, exit from the 7th layer of the 54th slot, then enter from the 8th layer of the 9th slot, exit from the 7th layer of the 18th slot, then enter from the 8th layer of the 27th slot, exit from the 7th layer of the 36th slot, then enter from the 8th layer of the 45th slot, exit from the 7th layer of the 1st slot, thus completing the traversal of the 7th and 8th layer flat wires.

[0213] The lead-out line at the head end of the second sub-branch of the second branch of the U phase starts at the 6th layer of slot 10, enters from the 6th layer of slot 10, exits from the 5th layer of slot 19, then enters from the 6th layer of slot 28, exits from the 5th layer of slot 37, then enters from the 6th layer of slot 46, exits from the 5th layer of slot 2, then enters from the 6th layer of slot 11, exits from the 5th layer of slot 20, then enters from the 6th layer of slot 29, exits from the 5th layer of slot 38, then enters from the 6th layer of slot 47, exits from the 5th layer of slot 54, then enters from the 6th layer of slot 9, exits from the 5th layer of slot 18, then enters from the 6th layer of slot 27, exits from the 5th layer of slot 36, then enters from the 6th layer of slot 45, and exits from the 5th layer of slot 1, thus completing the traversal of the 5th and 6th layer flat wires.

[0214] The lead-out line at the head end of the third sub-branch of the second branch of the U phase starts at the 4th layer of slot 10, enters from the 4th layer of slot 10, exits from the 3rd layer of slot 19, then enters from the 4th layer of slot 28, exits from the 3rd layer of slot 37, then enters from the 4th layer of slot 46, exits from the 3rd layer of slot 2, then enters from the 4th layer of slot 11, exits from the 3rd layer of slot 20, then enters from the 4th layer of slot 29, exits from the 3rd layer of slot 38, then enters from the 4th layer of slot 47, exits from the 3rd layer of slot 54, then enters from the 4th layer of slot 9, exits from the 3rd layer of slot 18, then enters from the 4th layer of slot 27, exits from the 3rd layer of slot 36, then enters from the 4th layer of slot 45, exits from the 3rd layer of slot 1, thus completing the traversal of the 3rd and 4th layer flat wires.

[0215] The lead-out line at the head end of the fourth sub-branch of the second branch of the U-phase starts at the 2nd layer of slot 10, enters from the 2nd layer of slot 10, exits from the 1st layer of slot 19, then enters from the 2nd layer of slot 28, exits from the 1st layer of slot 37, then enters from the 2nd layer of slot 46, exits from the 1st layer of slot 2, then enters from the 2nd layer of slot 11, exits from the 1st layer of slot 20, then enters from the 2nd layer of slot 29, exits from the 1st layer of slot 38, then enters from the 2nd layer of slot 47, exits from the 1st layer of slot 3, then enters from the 2nd layer of slot 12, exits from the 1st layer of slot 21, then enters from the 2nd layer of slot 30, exits from the 1st layer of slot 39, then enters from the 2nd layer of slot 48, exits from the 1st layer of slot 1, thus completing the traversal of the 1st and 2nd layer flat wires.

[0216] At this point, the first layer of the first slot is led out to form the outlet terminal U of the second branch of the U-phase winding. 2out .

[0217] 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 It can be obtained by translating based on the second branch of the U phase.

[0218] 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 2. Figure 7 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0219] like Figure 7 and Figure 3 As shown, each winding slot contains L=8 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 and the eighth layer is L8. The first layer is the bottom layer of the winding slot, and the eighth layer is the slot opening layer.

[0220] Figure 7Each 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 8 layers of flat wires are divided into 3 groups, T1, T2, and T3 are 3, 2, and 3 respectively, that is, T1 contains the 1st / 2nd / 3rd layers of flat wires, T2 contains the 4th / 5th layers of flat wires, and T3 contains the 6th / 7th / 8th layers of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by another winding slot relative to the flat wires of the T2 layer in the same direction of the circumference of the flat wire motor, so that the winding can achieve a continuous short distance effect.

[0221] The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0222] For example, the lead-out line at the head end of the first sub-branch of the first branch of the U phase starts from the first layer of the 10th slot. After connecting all the flat wires belonging to the first branch on the 1 / 2 layers, the lead-out line at the tail end is led out from the second layer of the 19th slot. In this process, three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0223] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layer, the lead-out line at the tail end is led out from the 4th layer of the 18th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+2=8, Z / 2p+1=10, and Z / 2p+2=11 respectively.

[0224] The lead-out line at the head end of the third sub-branch of the U phase starts from the 5th layer of the 9th slot. After connecting all the flat wires belonging to the first branch at the 5th / 6th layer, the lead-out line at the tail end is led out from the 6th layer of the 17th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+2=8, Z / 2p+1=10, and Z / 2p+2=11 respectively.

[0225] The lead-out line at the head end of the fourth sub-branch of the U phase starts from the 7th layer of the 8th slot. After connecting all the flat wires belonging to the first branch at the 7th / 8th layer, the lead-out line at the tail end is led out from the 8th layer of the 17th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0226] Based on the four sub-branches of the first branch, it can be known that there are 3*L / 2=12 types of card issuing coils in total.

[0227] The first, second, third and fourth sub-branches of the second branch of the U phase can be arranged with reference to the first branch of the U phase, and will not be described in detail here.

[0228] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first, second, third, and fourth sub-branch coils. Figure 7In the third embodiment shown, the spans of the inter-layer and inter-line segments between layers are equal, and the spans are all Z / 2p=9. Except for the inter-layer and inter-line segments, the remaining welding layers have two spans, namely Z / 2p-1=8 and Z / 2p=9.

[0229] like Figure 7 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 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.

[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 two parallel branches of the U phase 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 in the figure, the first branch of the first branch of the U phase starts from the first layer of the 10th slot as the incoming line terminal U 1in , enter from the 1st layer of the 10th slot, exit from the 2nd layer of the 3rd slot, then enter from the 1st layer of the 48th slot, exit from the 2nd layer of the 39th slot, then enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 21st slot, then enter from the 1st layer of the 12th slot, exit from the 2nd layer of the 2nd slot, then enter from the 1st layer of the 47th slot, exit from the 2nd layer of the 38th slot, then enter from the 1st layer of the 29th slot, exit from the 20th slot, then enter from the 1st layer of the 11th slot, exit from the 2nd layer of the 1st slot, then enter from the 1st layer of the 46th slot, exit from the 2nd layer of the 37th slot, then enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 19th slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0233] The lead-out line at the head end of the second sub-branch of the first branch of the U phase starts at the 3rd layer of the 10th slot, enters from the 3rd layer of the 10th slot, exits from the 4th layer of the 2nd slot, then enters from the 3rd layer of the 48th slot, exits from the 4th layer of the 38th slot, then enters from the 3rd layer of the 30th slot, exits from the 4th layer of the 20th slot, then enters from the 3rd layer of the 12th slot, exits from the 4th layer of the 1st slot, then enters from the 3rd layer of the 47th slot, exits from the 4th layer of the 37th slot, then enters from the 3rd layer of the 29th slot, exits from the 4th layer of the 19th slot, then enters from the 3rd layer of the 11th slot, exits from the 4th layer of the 54th slot, then enters from the 3rd layer of the 46th slot, exits from the 4th layer of the 36th slot, then enters from the 3rd layer of the 28th slot, exits from the 4th layer of the 18th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0234] The lead-out line at the head end of the third sub-branch of the first branch of the U phase starts at the 5th layer of slot 9, enters from the 5th layer of slot 9, exits from the 6th layer of slot 1, then enters from the 5th layer of slot 47, exits from the 6th layer of slot 37, then enters from the 5th layer of slot 29, exits from the 6th layer of slot 19, then enters from the 5th layer of slot 11, exits from the 6th layer of slot 54, then enters from the 5th layer of slot 46, exits from the 6th layer of slot 36, then enters from the 5th layer of slot 28, exits from the 6th layer of slot 18, then enters from the 5th layer of slot 10, exits from the 6th layer of slot 53, then enters from the 5th layer of slot 45, exits from the 6th layer of slot 35, then enters from the 5th layer of slot 27, exits from the 6th layer of slot 17, thus completing the traversal of the 5th and 6th layer flat wires.

[0235] The lead-out line at the head end of the fourth sub-branch of the first branch of the U phase starts at the 7th layer of slot 8, enters from the 7th layer of slot 8, exits from the 8th layer of slot 1, then enters from the 7th layer of slot 46, exits from the 8th layer of slot 37, then enters from the 7th layer of slot 28, exits from the 8th layer of slot 19, then enters from the 7th layer of slot 10, exits from the 8th layer of slot 54, then enters from the 7th layer of slot 45, exits from the 8th layer of slot 36, then enters from the 7th layer of slot 27, exits from the 8th layer of slot 18, then enters from the 7th layer of slot 9, exits from the 8th layer of slot 53, then enters from the 7th layer of slot 44, exits from the 8th layer of slot 35, then enters from the 7th layer of slot 26, and exits from the 8th layer of slot 17, thus completing the traversal of the 7th and 8th layers of flat wires.

[0236] At this point, the 8th layer of the 17th slot is led out to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0237] The first sub-branch of the second branch of phase U starts at the 8th layer of slot 10 as the incoming line terminal U 2in, enter from the 8th layer of the 10th slot, exit from the 7th layer of the 19th slot, then enter from the 8th layer of the 28th slot, exit from the 7th layer of the 37th slot, then enter from the 8th layer of the 46th slot, exit from the 7th layer of the 53rd slot, then enter from the 8th layer of the 8th slot, exit from the 7th layer of the 17th slot, then enter from the 8th layer of the 26th slot, exit from the 7th layer of the 35th slot, then enter from the 8th layer of the 44th slot, exit from the 7th layer of the 54th slot, then enter from the 8th layer of the 9th slot, exit from the 7th layer of the 18th slot, then enter from the 8th layer of the 27th slot, exit from the 7th layer of the 36th slot, then enter from the 8th layer of the 45th slot, exit from the 7th layer of the 1st slot, thus completing the traversal of the 7th and 8th layer flat wires.

[0238] The lead-out line at the head end of the second sub-branch of the second branch of the U phase starts at the 6th layer of slot 10, enters from the 6th layer of slot 10, exits from the 5th layer of slot 20, then enters from the 6th layer of slot 28, exits from the 5th layer of slot 38, then enters from the 6th layer of slot 46, exits from the 5th layer of slot 54, then enters from the 6th layer of slot 8, exits from the 5th layer of slot 18, then enters from the 6th layer of slot 26, exits from the 5th layer of slot 36, then enters from the 6th layer of slot 44, exits from the 5th layer of slot 1, then enters from the 6th layer of slot 9, exits from the 5th layer of slot 19, then enters from the 6th layer of slot 27, exits from the 5th layer of slot 37, then enters from the 6th layer of slot 45, exits from the 5th layer of slot 2, thus completing the traversal of the 5th and 6th layer flat wires.

[0239] The lead-out line at the head end of the third sub-branch of the second branch of the U phase starts at the 4th layer of slot 11, enters from the 4th layer of slot 11, exits from the 3rd layer of slot 21, then enters from the 4th layer of slot 29, exits from the 3rd layer of slot 39, then enters from the 4th layer of slot 47, exits from the 3rd layer of slot 1, then enters from the 4th layer of slot 9, exits from the 3rd layer of slot 19, then enters from the 4th layer of slot 27, exits from the 3rd layer of slot 37, then enters from the 4th layer of slot 45, exits from the 3rd layer of slot 2, then enters from the 4th layer of slot 10, exits from the 3rd layer of slot 20, then enters from the 4th layer of slot 28, exits from the 3rd layer of slot 38, then enters from the 4th layer of slot 46, exits from the 3rd layer of slot 3, thus completing the traversal of the 3rd and 4th layer flat wires.

[0240] The lead-out line at the head end of the fourth sub-branch of the second branch of the U phase starts at the 2nd layer of slot 12, enters from the 2nd layer of slot 12, exits from the 1st layer of slot 21, then enters from the 2nd layer of slot 30, exits from the 1st layer of slot 39, then enters from the 2nd layer of slot 48, exits from the 1st layer of slot 1, then enters from the 2nd layer of slot 10, exits from the 1st layer of slot 19, then enters from the 2nd layer of slot 28, exits from the 1st layer of slot 37, then enters from the 2nd layer of slot 46, exits from the 1st layer of slot 2, then enters from the 2nd layer of slot 11, exits from the 1st layer of slot 20, then enters from the 2nd layer of slot 29, exits from the 1st layer of slot 38, then enters from the 2nd layer of slot 47, exits from the 1st layer of slot 3, thus completing the traversal of the 1st and 2nd layer flat wires.

[0241] At this point, the first layer of the third slot is led out to form the outlet terminal U of the second branch of the U-phase winding. 2out .

[0242] 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 It can be obtained by translating based on the second branch of the U phase.

[0243] 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 are 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 2. Figure 8 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0244] like Figure 8 and Figure 3 As shown, each winding slot contains L=4 layers of flat wires, the first layer is L1, the second layer is L2, the third layer is L3 and the fourth layer is L4. The first layer is the bottom layer of the winding slot, and the fourth layer is the slot opening layer.

[0245] Figure 8 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 4 layers of flat wires are divided into 3 groups, T1, T2, and T3 are 1, 2, and 1 respectively, that is, T1 contains the 1st layer of flat wires, T2 contains the 2nd / 3rd layer of flat wires, and T3 contains the 4th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer in the clockwise direction of the flat wire motor circumferential direction, and the flat wires of the T3 layer are staggered by another winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor circumferential direction, so that the winding achieves a continuous short distance effect.

[0246] For example, the lead-out line of the first sub-branch of the first branch of the U-phase starts from the first layer of the 10th slot. After connecting all the flat wires belonging to the first branch on the 1 / 2 layers, the lead-out line at the tail end is led out from the second layer of the 18th slot. In this process, three types of hairpin coils with different spans are used, with spans of Z / 2p-q+2=8, Z / 2p+1=10, and Z / 2p+2=11 respectively.

[0247] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layer, the lead-out line at the tail end is led out from the 4th layer of the 18th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+2=8, Z / 2p+1=10, and Z / 2p+2=11 respectively.

[0248] Combining the two sub-branches, we can see that there are 3*L / 2=6 types of card issuing coils in total.

[0249] The first and second sub-branches of the second branch of the U phase can be arranged with reference to the first branch of the U phase, and will not be described in detail here.

[0250] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first and second sub-branch coils. Figure 8 In the fourth embodiment shown, the spans of the inter-layer and inter-line segments between the layers are equal, and the spans are all Z / 2p+1=10. Except for the inter-layer and inter-line segments, the remaining welding layers only have one span, which is Z / 2p-1=8. The twisting, welding and coating processes can be simplified.

[0251] 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 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 first-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 2nd / 3rd-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 4th-layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase belt.

[0252] 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.

[0253] Combine the following Figure 8 The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figure 8The 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.

[0254] like Figure 8 As shown in the figure, the first branch of the first branch of the U phase starts from the first layer of the 10th slot as the incoming line terminal U 1in , enter from the 1st layer of the 10th slot, exit from the 2nd layer of the 2nd slot, then enter from the 1st layer of the 48th slot, exit from the 2nd layer of the 38th slot, then enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 20th slot, then enter from the 1st layer of the 12th slot, exit from the 2nd layer of the 1st slot, then enter from the 1st layer of the 47th slot, exit from the 2nd layer of the 37th slot, then enter from the 1st layer of the 29th slot, exit from the 2nd layer of the 19th slot, then enter from the 1st layer of the 11th slot, exit from the 2nd layer of the 54th slot, then enter from the 1st layer of the 46th slot, exit from the 2nd layer of the 36th slot, then enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 18th slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0255] The lead-out line at the head end of the second sub-branch of the first branch of the U phase starts at the 3rd layer of the 10th slot, enters from the 3rd layer of the 10th slot, exits from the 4th layer of the 53rd slot, then enters from the 3rd layer of the 45th slot, exits from the 4th layer of the 35th slot, then enters from the 3rd layer of the 27th slot, exits from the 4th layer of the 17th slot, then enters from the 3rd layer of the 9th slot, exits from the 4th layer of the 1st slot, then enters from the 3rd layer of the 47th slot, exits from the 4th layer of the 37th slot, then enters from the 3rd layer of the 29th slot, exits from the 4th layer of the 19th slot, then enters from the 3rd layer of the 11th slot, exits from the 4th layer of the 54th slot, then enters from the 3rd layer of the 46th slot, exits from the 4th layer of the 36th slot, then enters from the 3rd layer of the 28th slot, exits from the 4th layer of the 18th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0256] At this point, the 4th layer of the 18th slot is led out to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0257] The first sub-branch of the second branch of phase U starts at the fourth layer of slot 10 as the incoming line terminal U 2in, enter from the 4th layer of the 10th slot, exit from the 3rd layer of the 20th slot, then enter from the 4th layer of the 28th slot, exit from the 3rd layer of the 38th slot, then enter from the 4th layer of the 46th slot, exit from the 3rd layer of the 54th slot, then enter from the 4th layer of the 8th slot, exit from the 3rd layer of the 18th slot, then enter from the 4th layer of the 26th slot, exit from the 3rd layer of the 36th slot, then enter from the 4th layer of the 44th slot, exit from the 3rd layer of the 1st slot, then enter from the 4th layer of the 9th slot, exit from the 3rd layer of the 19th slot, then enter from the 4th layer of the 27th slot, exit from the 3rd layer of the 37th slot, then enter from the 4th layer of the 45th slot, exit from the 3rd layer of the 2nd slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0258] The lead-out line at the head end of the second sub-branch of the second branch of the U-phase starts at the 2nd layer of slot 10, enters from the 2nd layer of slot 10, exits from the 1st layer of slot 20, then enters from the 2nd layer of slot 28, exits from the 1st layer of slot 38, then enters from the 2nd layer of slot 46, exits from the 1st layer of slot 3, then enters from the 2nd layer of slot 11, exits from the 1st layer of slot 21, then enters from the 2nd layer of slot 29, exits from the 1st layer of slot 39, then enters from the 2nd layer of slot 47, exits from the 1st layer of slot 1, then enters from the 2nd layer of slot 9, exits from the 1st layer of slot 19, then enters from the 2nd layer of slot 27, exits from the 1st layer of slot 37, then enters from the 2nd layer of slot 45, exits from the 1st layer of slot 2, thus completing the traversal of the 1st and 2nd layer flat wires.

[0259] At this point, the first layer of the second slot is led out to form the outlet terminal U of the second branch of the U-phase winding. 2out .

[0260] 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 It can be obtained by translating based on the second branch of the U phase.

[0261] In one embodiment, Fig. 9 The fifth embodiment shown is similar to Figure 8 The difference of the fourth embodiment shown is that Fig. 9 In the fifth embodiment shown, Figure 8 The tail lead wire of the first branch of the U phase in the fourth embodiment shown is connected to the head lead wire of the second branch of the U phase, that is, the flat wire of the 4th layer of the 18th slot is connected to the flat wire of the 4th layer of the 10th slot, so that the two parallel branches of the U phase are connected in series into one branch.

[0262] The two branches of the V phase and the W phase are connected similarly to the two branches of the U phase to form one branch respectively.

[0263] 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 2. Fig.10 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0264] like Fig.10 and Figure 3 As shown, each winding slot contains L=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.

[0265] 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 10 layers of flat wires are divided into 3 groups, T1, T2, and T3 are 3, 4, and 3 respectively, that is, T1 contains the 1st / 2nd / 3rd layers of flat wires, T2 contains the 4th / 5th / 6th / 7th layers of flat wires, and T3 contains the 8th / 9th / 10th layers of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by another winding slot relative to the flat wires of the T2 layer in the same direction of the circumference of the flat wire motor, so that the winding can achieve a continuous short distance effect.

[0266] The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0267] For example, the lead-out line at the head end of the first sub-branch of the first branch of the U phase starts from the first layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 1 / 2 layers, the lead-out line at the tail end is led out from the second layer of the 1st slot. In this process, three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0268] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layer, the lead-out line at the tail end is led out from the 4th layer of the 54th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q=6, Z / 2p-1=8, and Z / 2p=9 respectively.

[0269] The lead-out line at the head end of the third sub-branch of the U phase starts from the 5th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 5th / 6th layer, the lead-out line at the tail end is led out from the 6th layer of the 1st slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0270] The lead-out line at the head end of the fourth sub-branch of the U phase starts from the 7th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 7th / 8th layer, the lead-out line at the tail end is led out from the 8th layer of the 54th slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q=6, Z / 2p-1=8, and Z / 2p=9 respectively.

[0271] The lead-out line at the head end of the fifth sub-branch of the U phase starts from the 9th layer of the 10th slot. After connecting all the flat wires belonging to the first branch at the 9th / 10th layer, the lead-out line at the tail end is led out from the 10th layer of the 1st slot. Three types of hairpin coils with different spans are used, with spans of Z / 2p-q+1=7, Z / 2p=9, and Z / 2p+1=10 respectively.

[0272] Based on the five sub-branches of the first branch, it can be known that there are 3*L / 2=15 types of card issuing coils in total.

[0273] The first, second, third, fourth and fifth sub-branches of the second branch of the U phase can be arranged with reference to the first branch of the U phase, and will not be described in detail here.

[0274] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first, second, third, fourth, and fifth sub-branch coils. Fig.10 In the sixth embodiment shown, the spans of the cross-layer and cross-line segments between layers include two spans, namely Z / 2p+1=10 and Z / 2p=9. In addition to the cross-layer and cross-line segments, the remaining welding layers also include two spans, namely Z / 2p=9 and Z / 2p+1=10.

[0275] like Fig.10 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 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 / 6th / 7th-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 8th / 9th / 10th-layer flat wires in the 8th slot, the 9th slot and the 10th slot are one phase belt.

[0276] like Fig.10As 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.

[0277] Combine the following Fig.10 The wiring method of the two parallel branches of the U phase 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.

[0278] like Fig.10 As shown in the figure, the first branch of the first branch of the U phase starts from the first layer of the 10th slot as the incoming line terminal U 1in , enter from the 1st layer of the 10th slot, exit from the 2nd layer of the 20th slot, then enter from the 1st layer of the 29th slot, exit from the 2nd layer of the 38th slot, then enter from the 1st layer of the 47th slot, exit from the 2nd layer of the 2nd slot, then enter from the 1st layer of the 11th slot, exit from the 2nd layer of the 21st slot, then enter from the 1st layer of the 30th slot, exit from the 2nd layer of the 39th slot, then enter from the 1st layer of the 48th slot, exit from the 2nd layer of the 3rd slot, then enter from the 1st layer of the 12th slot, exit from the 2nd layer of the 19th slot, then enter from the 1st layer of the 28th slot, exit from the 2nd layer of the 37th slot, then enter from the 1st layer of the 46th slot, exit from the 2nd layer of the 1st slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0279] The lead-out line at the head end of the second sub-branch of the first branch of the U phase starts at the 3rd layer of the 10th slot, enters from the 3rd layer of the 10th slot, exits from the 4th layer of the 19th slot, then enters from the 3rd layer of the 29th slot, exits from the 4th layer of the 37th slot, then enters from the 3rd layer of the 47th slot, exits from the 4th layer of the 1st slot, then enters from the 3rd layer of the 11th slot, exits from the 4th layer of the 20th slot, then enters from the 3rd layer of the 30th slot, exits from the 4th layer of the 38th slot, then enters from the 3rd layer of the 48th slot, exits from the 4th layer of the 2nd slot, then enters from the 3rd layer of the 12th slot, exits from the 4th layer of the 18th slot, then enters from the 3rd layer of the 28th slot, exits from the 4th layer of the 36th slot, then enters from the 3rd layer of the 46th slot, exits from the 4th layer of the 54th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0280] The lead-out line at the head end of the third sub-branch of the first branch of the U phase starts at the 5th layer of slot 10, enters from the 5th layer of slot 10, exits from the 6th layer of slot 20, then enters from the 5th layer of slot 29, exits from the 6th layer of slot 38, then enters from the 5th layer of slot 47, exits from the 6th layer of slot 2, then enters from the 5th layer of slot 11, exits from the 6th layer of slot 18, then enters from the 5th layer of slot 27, exits from the 6th layer of slot 36, then enters from the 5th layer of slot 45, exits from the 6th layer of slot 54, then enters from the 5th layer of slot 9, exits from the 6th layer of slot 19, then enters from the 5th layer of slot 28, exits from the 6th layer of slot 37, then enters from the 5th layer of slot 46, exits from the 6th layer of slot 1, thus completing the traversal of the 5th and 6th layer flat wires.

[0281] The lead-out line at the head end of the fourth sub-branch of the first branch of the U phase starts at the 7th layer of slot 10, enters from the 7th layer of slot 10, exits from the 8th layer of slot 19, then enters from the 7th layer of slot 29, exits from the 8th layer of slot 37, then enters from the 7th layer of slot 47, exits from the 8th layer of slot 1, then enters from the 7th layer of slot 11, exits from the 8th layer of slot 17, then enters from the 7th layer of slot 27, exits from the 8th layer of slot 35, then enters from the 7th layer of slot 45, exits from the 8th layer of slot 53, then enters from the 7th layer of slot 9, exits from the 8th layer of slot 18, then enters from the 7th layer of slot 28, exits from the 8th layer of slot 36, then enters from the 7th layer of slot 46, and exits from the 8th layer of slot 54, thus completing the traversal of the 7th and 8th layers of flat wires.

[0282] The lead-out line at the head end of the fifth sub-branch of the first branch of the U phase starts at the 9th layer of slot No. 10, enters from the 9th layer of slot No. 10, exits from the 10th layer of slot No. 17, then enters from the 9th layer of slot No. 26, exits from the 10th layer of slot No. 35, then enters from the 9th layer of slot No. 44, exits from the 10th layer of slot No. 53, then enters from the 9th layer of slot No. 8, exits from the 10th layer of slot No. 18, then enters from the 9th layer of slot No. 27, exits from the 10th layer of slot No. 36, then enters from the 9th layer of slot No. 45, exits from the 10th layer of slot No. 54, then enters from the 9th layer of slot No. 9, exits from the 10th layer of slot No. 19, then enters from the 9th layer of slot No. 28, exits from the 10th layer of slot No. 37, then enters from the 9th layer of slot No. 46, exits from the 10th layer of slot No. 1, thus completing the traversal of the 9th and 10th layers of flat wires.

[0283] At this point, the 10th layer of the first slot is led out to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0284] The first sub-branch of the second branch of phase U starts at the 10th layer of slot 10 as the incoming line terminal U 2in, enter from the 10th layer of the 10th slot, exit from the 9th layer of the 54th slot, then enter from the 10th layer of the 45th slot, exit from the 9th layer of the 36th slot, then enter from the 10th layer of the 27th slot, exit from the 9th layer of the 18th slot, then enter from the 10th layer of the 9th slot, exit from the 9th layer of the 9th slot, then enter from the 10th layer of the 53rd slot, then enter from the 10th layer of the 44th slot, exit from the 9th layer of the 35th slot, then enter from the 10th layer of the 26th slot, exit from the 9th layer of the 17th slot, then enter from the 10th layer of the 8th slot, exit from the 9th layer of the 1st slot, then enter from the 10th layer of the 46th slot, exit from the 9th layer of the 37th slot, then enter from the 10th layer of the 28th slot, exit from the 9th layer of the 19th slot, thus completing the traversal of the 9th and 10th layers of flat wires.

[0285] The lead-out line at the head end of the first sub-branch of the second branch of the U phase starts at the 8th layer of the 10th slot, enters from the 8th layer of the 10th slot, exits from the 7th layer of the 1st slot, then enters from the 8th layer of the 45th slot, exits from the 7th layer of the 37th slot, then enters from the 8th layer of the 27th slot, exits from the 7th layer of the 19th slot, then enters from the 8th layer of the 9th slot, exits from the 7th layer of the 54th slot, then enters from the 8th layer of the 44th slot, exits from the 7th layer of the 36th slot, then enters from the 8th layer of the 26th slot, exits from the 7th layer of the 18th slot, then enters from the 8th layer of the 8th slot, exits from the 7th layer of the 2nd slot, then enters from the 8th layer of the 46th slot, exits from the 7th layer of the 38th slot, then enters from the 8th layer of the 28th slot, and exits from the 7th layer of the 20th slot, thus completing the traversal of the 7th and 8th layers of flat wires.

[0286] The lead-out line at the head end of the second sub-branch of the second branch of the U phase starts at the 6th layer of slot 10, enters from the 6th layer of slot 10, exits from the 5th layer of slot 54, then enters from the 6th layer of slot 45, exits from the 5th layer of slot 36, then enters from the 6th layer of slot 27, exits from the 5th layer of slot 18, then enters from the 6th layer of slot 9, exits from the 5th layer of slot 2, then enters from the 6th layer of slot 47, exits from the 5th layer of slot 38, then enters from the 6th layer of slot 29, exits from the 5th layer of slot 20, then enters from the 6th layer of slot 11, exits from the 5th layer of slot 1, then enters from the 6th layer of slot 46, exits from the 5th layer of slot 37, then enters from the 6th layer of slot 28, exits from the 5th layer of slot 19, thus completing the traversal of the 5th and 6th layer flat wires.

[0287] The lead-out line at the head end of the third sub-branch of the second branch of the U phase starts at the 4th layer of slot 10, enters from the 4th layer of slot 10, exits from the 3rd layer of slot 1, then enters from the 4th layer of slot 45, exits from the 3rd layer of slot 37, then enters from the 4th layer of slot 27, exits from the 3rd layer of slot 19, then enters from the 4th layer of slot 9, exits from the 3rd layer of slot 3, then enters from the 4th layer of slot 47, exits from the 3rd layer of slot 39, then enters from the 4th layer of slot 29, exits from the 3rd layer of slot 21, then enters from the 4th layer of slot 11, exits from the 3rd layer of slot 2, then enters from the 4th layer of slot 46, exits from the 3rd layer of slot 38, then enters from the 4th layer of slot 28, exits from the 3rd layer of slot 20, thus completing the traversal of the 3rd and 4th layer flat wires.

[0288] The lead-out line at the head end of the fourth sub-branch of the second branch of the U-phase starts at the 2nd layer of slot 10, enters from the 2nd layer of slot 10, exits from the 1st layer of slot 3, then enters from the 2nd layer of slot 48, exits from the 1st layer of slot 39, then enters from the 2nd layer of slot 30, exits from the 1st layer of slot 21, then enters from the 2nd layer of slot 12, exits from the 1st layer of slot 2, then enters from the 2nd layer of slot 47, exits from the 1st layer of slot 38, then enters from the 2nd layer of slot 29, exits from the 1st layer of slot 20, then enters from the 2nd layer of slot 11, exits from the 1st layer of slot 1, then enters from the 2nd layer of slot 46, exits from the 1st layer of slot 37, then enters from the 2nd layer of slot 28, exits from the 1st layer of slot 19, thus completing the traversal of the 1st and 2nd layer flat wires.

[0289] At this point, the first layer of the 19th slot is led out to form the outlet terminal U of the second branch of the U-phase winding. 2out .

[0290] 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 It can be obtained by translating based on the second branch of the U phase.

[0291] like Figures 5 to 10As shown, from Example 1 to Example 6, it can be seen that the winding arrangement in the embodiments of the present application is applicable to both even layers with L / 2=odd numbers and even layers with L / 2=even numbers, which broadens the flexibility of winding design. Multiple flat wire groups are staggered by 1 slot, which can be 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 at different layers in each pole slot, and the back electromotive force and current of each parallel sub-winding are exactly the same, eliminating the additional copper loss of the winding circulation caused by the parallel connection of the windings, ensuring the uniformity of the winding temperature, and thus improving the life of the motor. The three-phase lead wires are located on the first layer or the Lth layer, which can make full use of the radial space and simplify the Busbar structure. The hairpin coils on each layer are independent of each other, and there are no additional cross-layer hairpin coils. Fully automated wiring can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0292] 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 and N turns of flat wires, wherein the N turns of flat wires are arranged radially along the flat wire motor, wherein N is an integer greater than or equal to 2, and each turn of the flat wires comprises a plurality of pairs of flat wires arranged circumferentially along the flat wire motor, wherein each winding slot is used to accommodate a pair of the flat wires in each turn of the N turns of flat wires, wherein each pair of the flat wires comprises an outer flat wire and an inner flat wire, wherein the distance between the outer flat wire and the axis of the flat wire motor in the radial direction of the flat wire motor is greater than the distance between the inner flat wire and the axis of the flat wire motor, wherein one outer flat wire in each pair of the flat wires in each turn of the flat wires is used to connect one inner flat wire in another pair of the flat wires, wherein: The N circles of flat wires include a first circle of flat wires, the outer layer of flat wires in the first circle of flat wires include a first flat wire, a second flat wire and a third flat wire, and the first flat wire, the second flat wire and the third flat wire are connected to the inner layer of flat wires corresponding to them respectively through three cross-line segments of different lengths.

2. The flat wire motor according to claim 1, characterized in that: The difference between the number of winding slots spanned by a span segment connected by the third flat wire and the number of winding slots spanned by a span segment connected by the second flat wire is 1, and the difference between the number of winding slots spanned by a span segment connected by the second flat wire and the number of winding slots spanned by a span segment connected by the first flat wire is 2.

3. The flat wire motor according to claim 1 or 2, characterized in that: The first flat wire and an inner flat wire connected thereto are arranged between the third flat wire and an inner flat wire connected thereto.

4. The flat wire motor according to claim 3, characterized in that: One of the first flat wires and one of the third flat wires are arranged adjacent to each other, and one of the inner flat wires connected to the one of the first flat wires and one of the inner flat wires connected to the one of the third flat wires are spaced apart by one of the winding slots.

5. The flat wire motor according to any one of claims 1 to 4, characterized in that: The outer layer of flat wires in the first circle of flat wires includes two third flat wires, and the two third flat wires are adjacently arranged on the same side of the first flat wire along the circumferential direction of the flat wire motor.

6. The flat wire motor according to any one of claims 1 to 5, characterized in that: An inner layer flat wire connected to one of the first flat wires or one of the third flat wires and one of the second flat wires are arranged adjacent to each other in the same winding slot along the radial direction of the flat wire motor.

7. The flat wire motor according to any one of claims 1 to 6, characterized in that: The outer layer flat wire in the first circle of flat wires includes a plurality of the second flat wires, the plurality of second flat wires are arranged adjacent to each other in the circumferential direction of the flat wire motor, and the plurality of second flat wires and one of the inner layer flat wires connected thereto are connected via the same cross-wire segment.

8. The flat wire motor according to any one of claims 1 to 7, characterized in that: The N circles of flat wire also include a second circle of flat wire, which is arranged adjacent to the first circle of flat wire in the radial direction of the flat wire motor, and the distance between the outer layer flat wire in the first circle of flat wire and the axis of the flat wire motor in the radial direction of the flat wire motor is greater than the distance between the outer layer flat wire in the second circle of flat wire and the axis of the flat wire motor, and one of the inner layer flat wires in the first circle of flat wire is used to fixedly connect one of the outer layer flat wires in the second circle of flat wire through a cross-line segment.

9. The flat wire motor according to claim 8, characterized in that: The length of a cross-line segment between an inner layer flat wire of the first circle of flat wire and an outer layer flat wire of the second circle of flat wire connected thereto is less than or equal to the length of a cross-line segment between a third flat wire of the first circle of flat wire and an inner layer flat wire connected thereto.

10. The flat wire motor according to claim 9, characterized in that: The difference between the number of winding slots spanned by a cross-line segment between a third flat wire of the first circle of flat wire and an inner flat wire connected to it and the number of winding slots spanned by a cross-line segment between an inner flat wire of the first circle of flat wire and an outer flat wire of the second circle of flat wire connected to it is 1, 2 or 3.

11. The flat wire motor according to claim 8, characterized in that: The outer layer flat wire in the second circle of flat wires includes the first flat wire, the second flat wire and the third flat wire, and the number of winding slots spanned by a cross-line segment between the first flat wire in the first circle of flat wires and one of the inner layer flat wires connected to it is equal to the number of winding slots spanned by a cross-line segment between the first flat wire in the second circle of flat wires and one of the inner layer flat wires connected to it.

12. The flat wire motor according to claim 8, characterized in that: The outer layer flat wire in the second circle of flat wires includes the first flat wire, the second flat wire and the third flat wire, and the difference between the number of winding slots spanned by a cross-line segment between the first flat wire in the first circle of flat wires and one of the inner layer flat wires connected to it and the number of winding slots spanned by a cross-line segment between the first flat wire in the second circle of flat wires and one of the inner layer flat wires connected to it is 1.

13. The flat wire motor according to claim 8, characterized in that: The outer layer flat wire in the second circle of flat wires includes the first flat wire, the second flat wire and the third flat wire, and the difference between the number of winding slots spanned by a cross-line segment between the first flat wire in the second circle of flat wires and one of the inner layer flat wires connected thereto and the number of winding slots spanned by a cross-line segment between the first flat wire in the first circle of flat wires and one of the inner layer flat wires connected thereto is 1.

14. A powertrain, characterized in that: The power assembly includes a reducer and the flat wire motor as claimed in claim 13, wherein the motor shaft of the flat wire motor is used for transmission connection with 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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