Hairpin motor, powertrain and vehicle

Abstract

The present application relates to the technical field of motors, and in particular to a hairpin motor, a powertrain and a vehicle. A stator winding of the hairpin motor comprises a plurality of welding terminals, each welding terminal being formed by welding two flat wires at one end; and the two flat wires corresponding to each welding terminal are respectively arranged in two different winding slots. The plurality of welding terminals are divided into a plurality of rows of welding terminals in the radial direction of the hairpin motor, the plurality of welding terminals in each welding terminal row being spaced apart in the radial direction of the hairpin motor, and the plurality of rows of welding terminals being successively spaced apart in the circumferential direction of the hairpin motor. The plurality of rows of welding terminals are divided into a plurality of groups of welding terminals in the circumferential direction of the hairpin motor, the plurality of rows of welding terminals in each welding terminal group being successively and adjacently arranged in the circumferential direction of the hairpin motor; a plurality of flat wires corresponding to each group of the welding terminals are used for transmitting alternating current of the same phase; and two circumferentially adjacent groups of welding terminals of the hairpin motor are respectively used for transmitting alternating currents of different phases, thus reducing voltage differences between the welding terminals of different phases.

Description

Flat wire motor, power assembly and vehicle

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 202411255507.1, filed on September 9, 2024, entitled “Flat wire motor, power assembly and vehicle”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of electric machines, and in particular to a flat wire motor, a power assembly and a vehicle. BACKGROUND

[0004] With the development of electric vehicles, high voltage is the main direction of the development of drive motor technology at present, and higher requirements are also put forward for motor insulation system and reliability. Flat wire motors are widely used in electric vehicles due to their high power density and high torque density.

[0005] In the stator of the conventional flat wire motor, a plurality of flat wire bars are inserted into the stator core and then welded at the axial end of the stator core to form the stator winding after being expanded and twisted. With the radial direction of the flat wire motor as a reference, when each winding slot of the stator core contains conductors of different phases, the conductors will have the same twist angle at the axial end of the stator core, and multiple welding points of different phases will be arranged at the axial end of the stator core. The voltage difference between different welding points is large, which affects the function implementation of the flat wire motor. SUMMARY

[0006] The present application provides a flat wire motor, a power assembly and a vehicle. The plurality of welding points at the axial end of the flat wire motor are arranged in a same-phase radial adjacent manner, which can reduce the voltage difference of the welding points of the flat wire motor and is conducive to the function implementation of the flat wire motor.

[0007] In a first aspect, the application provides a flat wire motor which can be applied to an electric power assembly. The flat wire motor comprises a motor rotor and a motor stator, the motor stator comprising a stator core and a stator winding, the stator winding comprising a plurality of flat wires, the stator core comprising a plurality of winding slots, each winding slot being configured to accommodate a plurality of flat wires, the plurality of flat wires in the same winding slot being arranged in sequence along a radial direction of the flat wire motor, and each flat wire accommodated by the plurality of winding slots having one end exposed on the same side of the stator core, wherein: the stator winding comprises a plurality of welded end heads, each welded end head being formed by welding one end of two flat wires, and the two flat wires corresponding to each welded end head being arranged in two different winding slots respectively; the plurality of welded end heads are divided into a plurality of rows of welded end heads along the radial direction of the flat wire motor, the plurality of welded end heads in each row of welded end heads being arranged at intervals along the radial direction of the flat wire motor, and the plurality of rows of welded end heads being arranged at intervals in sequence along a circumferential direction of the flat wire motor; the plurality of rows of welded end heads are divided into a plurality of groups of welded end heads along the circumferential direction of the flat wire motor, the plurality of rows of welded end heads in each group of welded end heads being arranged adjacent to each other in sequence along the circumferential direction of the flat wire motor, and the plurality of flat wires corresponding to each group of welded end heads being configured to transmit alternating current of the same phase, and two groups of welded end heads adjacent to each other along the circumferential direction of the flat wire motor being configured to transmit alternating current of different phases respectively.

[0008] In the flat wire motor provided by the application, the welded end heads adjacent to each other along the radial direction of the flat wire motor belong to the same phase, the welded end heads of different phases can be arranged in different regions along the circumferential direction of the flat wire motor, the distance between the welded end heads of different phases is increased, the voltage difference between the welded end heads of different phases is reduced, and the influence on the performance and safety of the flat wire motor is reduced. In the specific implementation, the winding mode of the stator winding in the winding slots of the stator core does not need to be changed, only the end portions of the flat wires need to be designed and arranged, no additional manufacturing process and assembly step are required, no additional auxiliary structure is required, and the volume and weight of the flat wire motor are not increased, and the cost is low.

[0009] In an embodiment, the number of layers in which the two flat wires corresponding to each welded end head are arranged in the two different winding slots is different by 1. The two flat wires corresponding to each welded end head can be connected across layers.

[0010] In an embodiment, based on the short-pitch winding of the stator winding of the flat wire motor, in the two welded end heads adjacent to each other along the radial direction of the flat wire motor, the two flat wires corresponding to one welded end head and the two flat wires corresponding to the other welded end head are respectively staggered by one winding slot along the circumferential direction of the flat wire motor.

[0011] In an embodiment, in the two rows of welded end heads adjacent to each other along the circumferential direction of the flat wire motor, one welded end head in one row of welded end heads and one welded end head in the other row of welded end heads are arranged adjacent to each other along the circumferential direction of the flat wire motor. The two rows of welded end heads adjacent to each other along the circumferential direction occupy a similar width along the radial direction of the flat wire motor, which facilitates reducing the size of the end portion of the stator winding.

[0012] In one embodiment, two flat wires corresponding to one welding end head are arranged in the same layer and are staggered by one winding slot along the circumferential direction of the flat wire motor with respect to two flat wires corresponding to another welding end head which is adjacent to the one welding end head along the circumferential direction of the flat wire motor. The two welding end heads correspond to flat wires which are arranged adjacent to each other along the circumferential direction of the flat wire motor, which is conducive to reducing the size of the end portion of the stator winding.

[0013] In one embodiment, the distance between two adjacent rows of welding end heads in the same group is smaller than the distance between two adjacent rows of welding end heads in different groups along the circumferential direction of the flat wire motor. The welding end heads in different groups are used to transmit alternating currents of different phases, and the distance between the welding end heads of different phases can be increased to reduce the voltage difference.

[0014] In one embodiment, the flat wire motor is a three-phase motor, and any three groups of welding end heads which are adjacent to each other along the circumferential direction of the flat wire motor are used to transmit three-phase alternating currents. The stator winding of the flat wire motor includes a three-phase winding, and the three-phase winding is wound alternately on the stator core along the circumferential direction of the flat wire motor.

[0015] In one embodiment, the stator winding includes a plurality of lead wires for connecting phase currents, each lead wire is located on the same side of the stator core as the plurality of welding end heads, and at least a portion of each lead wire is arranged adjacent to a row of welding end heads of the same phase along the radial direction of the flat wire motor, which is conducive to reducing the voltage difference.

[0016] In one embodiment, the stator winding of the flat wire motor is wound in a short-pitch form, and in each row of welding end heads, the distance between each welding end head and the winding slot corresponding to one flat wire along the circumferential direction of the flat wire motor is not equal, and the distance between each welding end head and the winding slot corresponding to another flat wire along the circumferential direction of the flat wire motor is not equal.

[0017] In one embodiment, in each row of welding end heads, the distance between the welding end head closer to the center of the stator core and the winding slot corresponding to one flat wire along the circumferential direction of the flat wire motor is smaller than the distance between the welding end head farther from the center of the stator core and the winding slot corresponding to one flat wire along the circumferential direction of the flat wire motor, and the distance between the welding end head closer to the center of the stator core and the winding slot corresponding to another flat wire along the circumferential direction of the flat wire motor is greater than the distance between the welding end head farther from the center of the stator core and the winding slot corresponding to another flat wire along the circumferential direction of the flat wire motor.

[0018] In one embodiment, the plurality of flat wires corresponding to each row of welding end heads satisfy the following conditions:

[0019] wherein y 2k-1 is the slot number between the winding slot of the flat wire located in the 2k-1 layer and the corresponding welding end head, y 2kS is the slot number of the winding slot in which the flat wire located in the 2k layer is arranged between the winding slot and the corresponding welding end head 2k-1 S is the slot number of the winding slot in which the flat wire located in the 2k-1 layer is arranged 2k S is the slot number of the winding slot in which the flat wire located in the 2k layer is arranged S0 is the average value of the sum of the slot numbers of the winding slots in which the flat wires of the odd layer are arranged 0′ S0 is the average value of the sum of the slot numbers of the winding slots in which the flat wires of the even layer are arranged y is the pitch of the stator winding, and k is an integer greater than or equal to 1. The two flat wires corresponding to each welding end head are opposite in the extension direction of the circumferential direction of the flat wire motor.

[0020] In an embodiment, a plurality of flat wires of the same phase are arranged between two groups of welding end heads adjacent to each other and of the same phase in the circumferential direction of the flat wire motor, and the plurality of flat wires corresponding to one group of welding end heads are arranged adjacent to each other in the radial direction of the flat wire motor with the plurality of flat wires of the same layer corresponding to the other group of welding end heads.

[0021] In a second aspect, the application provides a power assembly, comprising a controller, a reducer, and any one of the motors provided in the above-mentioned second aspect, the motor shaft of the motor is drivingly connected to the input shaft of the reducer, and the controller is electrically connected to the motor to control the working state of the motor. Wherein, the reducer can be replaced by a transmission.

[0022] In a third aspect, the application provides a vehicle, comprising a wheel, a transmission mechanism, and a power assembly provided in the above-mentioned second aspect, the power assembly drives the wheel to rotate through the transmission mechanism.

[0023] The technical effects achieved by the above-mentioned second aspect and third aspect can refer to the description of the technical effects achieved by the corresponding design scheme in the above-mentioned first aspect, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0024] FIG. 1 is a structural schematic diagram of a vehicle provided in an embodiment of the application;

[0025] FIG. 2 is a structural schematic diagram of a power assembly provided in an embodiment of the application;

[0026] FIG. 3a is a structural schematic diagram of a stator of a flat wire motor provided in an embodiment of the application;

[0027] FIG. 3b is an enlarged view of the detail at R1 in FIG. 3a;

[0028] FIG. 4a is a partial structural schematic diagram of a stator of a flat wire motor provided in an embodiment of the application;

[0029] FIG. 4b is a partial structural schematic diagram of a stator of a flat wire motor provided in an embodiment of the application;

[0030] Fig. 5a is a partial structure diagram of a stator of a flat wire motor according to an embodiment of the present application;

[0031] Fig. 5b is a partial structure diagram of a stator of a flat wire motor according to an embodiment of the present application;

[0032] Fig. 6a is a partial structure diagram of a stator of a flat wire motor according to an embodiment of the present application;

[0033] Fig. 6b is a partial structure diagram of a stator of a flat wire motor according to an embodiment of the present application;

[0034] Fig. 7a is a partial structure diagram of a stator of a flat wire motor according to an embodiment of the present application;

[0035] Fig. 7b is a schematic diagram of a phase belt of a flat wire motor according to an embodiment of the present application;

[0036] Fig. 8a is a structure diagram of a U-phase winding of a flat wire motor according to an embodiment of the present application;

[0037] Fig. 8b is an enlarged view of a detail at R2 in Fig. 8a;

[0038] Fig. 8c is an enlarged view of a detail at R3 in Fig. 8a;

[0039] Fig. 9 is a structure diagram of a wire of a U-phase winding of a flat wire motor according to an embodiment of the present application;

[0040] Fig. 10 is a schematic diagram of a phase belt of a U-phase of a flat wire motor according to an embodiment of the present application;

[0041] Fig. 11a is a schematic diagram of a phase belt portion of a U-phase of a flat wire motor according to an embodiment of the present application;

[0042] Fig. 11b is a schematic diagram of a phase belt portion of a U-phase of a flat wire motor according to an embodiment of the present application;

[0043] Fig. 11c is a schematic diagram of a phase belt portion of a U-phase of a flat wire motor according to an embodiment of the present application;

[0044] Fig. 11d is a schematic diagram of a phase belt portion of a U-phase of a flat wire motor according to an embodiment of the present application;

[0045] Fig. 11e is a schematic diagram of a phase belt portion of a U-phase of a flat wire motor according to an embodiment of the present application;

[0046] Fig. 12 is a schematic diagram of a stator winding connection mode of a flat wire motor according to an embodiment of the present application.

[0047] Reference signs: 1000-steering mechanism; 2000-transmission structure; 3000-wheel; 100-flat wire motor; 200-reducer; 10-motor stator; 20-motor rotor; 30-motor shaft; 40-housing; 1-stator core; 11-center hole; 12, 12a, 12b-winding slot; 2-stator winding; 21, 21m, 21m', 21m'', 21n, 21n', 21n''-flat wire; 211, 211a, 211b-straight line segment; 212, 212a, 212b-folding line segment; 213-connection segment; 214-crossing line segment; 3-insulating paper. DETAILED DESCRIPTION

[0048] The flat wire motor is widely used in electric vehicles due to the advantages of high copper filling rate, facilitating heat dissipation of motor winding, improving the withstand voltage capacity of winding, and reducing the length of winding end, etc. The current stator winding of the flat wire motor adopts short distance design, and each winding slot of the stator core contains winding conductors of different phases.

[0049] When the head twisting angles of the conductors of different layers in the same winding slot are consistent, the arrangement form of the welding points of the stator winding at the axial end of the stator core is the same as that of the conductors in the winding slot, that is, the welding points of different phases are arranged adjacent along the radial direction of the stator core. The voltage difference of the welding points of different phases is large, and the close distance between them will affect the performance and safety of the flat wire motor. Currently, increasing the distance between the adjacent welding points will increase the volume of the flat wire motor, and coating the welding points will increase the cost.

[0050] Based on this, the embodiment of the present application provides a flat wire motor, a power assembly and a vehicle, the stator winding end of the flat wire unit is arranged in the radial direction of the same phase welding point, which can reduce the voltage difference between the welding points.

[0051] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be described in further detail below with reference to the drawings.

[0052] For the convenience of understanding, the related terms will be explained first as follows.

[0053] Stator: refers to the stationary part in the motor, which functions to generate a rotating magnetic field.

[0054] Rotor: refers to the rotating part in the motor, which functions to realize the conversion of electric energy and mechanical energy.

[0055] Number of poles: that is, the number of magnetic poles of the motor, the magnetic poles are 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, the number of pole pairs of the motor is 1, 2, 3, 4, and the number of poles of the motor is 2, 4, 6, 8.

[0056] Slot per pole per phase: the number of slots occupied by each phase winding under each magnetic pole is called slot per pole per phase.

[0057] Slot belt: the number of slots occupied by the same phase winding continuously under each magnetic pole is called slot belt.

[0058] For example, the vehicle provided in the embodiment of the present application is an electric vehicle or a hybrid vehicle. The vehicle includes a steering system for changing or maintaining the driving direction or reversing direction of the vehicle. As shown in FIG. 1, the vehicle includes wheels 3000, a transmission structure 2000, and a steering mechanism 1000, the steering mechanism 1000 is equivalent to a power assembly for outputting power, the steering mechanism 1000 is drivingly connected to the wheels 3000 through the transmission structure 2000 to steer the wheels 3000, and the wheels 3000 are equivalent to moving parts. The steering mechanism 1000 is a kind of power assembly, which includes a flat wire motor 100 and a speed reducer 200. The motor shaft of the flat wire motor 100 is drivingly connected to the input shaft of the speed reducer 200, and the output shaft of the speed reducer 200 is used to drivingly connect the above-mentioned transmission structure 2000. Among them, the speed reducer 200 can also be a transmission. The power assembly further includes a controller, which is electrically connected to the motor 100 and used to adjust the working state of the flat wire motor 100.

[0059] As shown in FIG. 2, the flat wire motor 100 includes a motor stator 10, a motor rotor 20, a motor shaft 30, and a housing 40. The motor rotor 20 is coaxially fixed to the motor shaft 30, and the motor shaft 30 is drivingly connected to the speed reducer 200. The motor stator 10 is sleeved outside the motor rotor 20, and the housing 40 is arranged outside the motor stator 10. The motor stator 10 includes a stator core 1 and a stator winding 2 wound on the stator core 1. When the stator winding 2 is energized, a magnetic field can be formed in the central hole of the stator core 1, and the motor rotor 20 can rotate around the axial line of the motor shaft 30 in the magnetic field.

[0060] FIG. 3a shows the structure of the motor stator 10. As shown in FIG. 3a, the motor stator 10 includes the stator core 1 and the stator winding 2. The stator core 1 is annular. The stator core 1 includes a central hole 11 and a plurality of winding slots 12. The stator winding 2 includes a plurality of flat wires 21.

[0061] As shown in FIG. 3a, the stator core 1 includes the central hole 11 and the plurality of winding slots 12. The central hole 11 penetrates the stator core 1 along the axial direction of the flat wire motor 100, and the plurality of winding slots 12 are arranged in intervals along the circumferential direction of the flat wire motor 100. In one embodiment, the plurality of winding slots 12 respectively communicate with the central hole 11 along the radial direction of the flat wire motor 100.

[0062] As shown in FIG. 3a, each winding slot 12 of the stator core 1 is used to accommodate a plurality of flat wires 21. Along the axial direction of the flat wire motor 100, the stator core 1 includes two axial end faces M. It should be understood that each flat wire 21 is partially accommodated in the winding slot 12 and partially exposed to the axial end face M of the stator core 1.

[0063] In an embodiment, one end of each flat wire 21 is exposed to one of the axial end faces M of the stator core 1. For ease of description, the axial end face M is considered as a first end face M1. An inner wall of each winding slot 12 is provided with an insulating paper 3 between the flat wire 21.

[0064] As shown in FIG. 3a, a part of the stator winding 2 protruding from the axial end face M of the stator core 1 along the axial direction of the flat wire motor 100 is referred to as an end winding. In the embodiment of the present application, the stator winding 2 further includes a plurality of lead-out wires Q for connecting phase currents. The lead-out wire Q is used to connect phase currents or bus bars. In an embodiment, the lead-out wire Q is exposed to the first end face M1 of the stator core 1. As shown in FIG. 3a, the lead-out wire Q is located on the same side of the stator core 1 as the plurality of soldered end heads T.

[0065] In the embodiment of the present application, the axial direction of the motor stator 10, the axial direction of the stator core 1, and the axial direction of the flat wire motor 100 refer to the same direction, the circumferential direction of the motor stator 10, the circumferential direction of the stator core 1, and the circumferential direction of the flat wire motor 100 refer to the same direction, and the radial direction of the motor stator 10, the radial direction of the stator core 1, and the radial direction of the flat wire motor 100 refer to the same direction.

[0066] FIG. 3b shows the partial structure of the motor stator 10 at R1 in FIG. 3a. As shown in FIG. 3b, the stator winding 2 includes a plurality of soldered end heads T, each soldered end head T is formed by soldering one end of each flat wire 21 exposed to the first end face M1, and each end of the flat wire 21 exposed to the first end face M1 is referred to as a soldered end t, and one soldered end head T is shown in a circular dashed line. The two flat wires 21 corresponding to each soldered end head T are arranged in two different winding slots 12, respectively. The plurality of soldered end heads T are divided into a plurality of rows of soldered end heads T along the radial direction of the flat wire motor 100, and one row of soldered end heads T is shown in a square dashed line. The plurality of soldered end heads T in each row of soldered end heads T are arranged at intervals along the radial direction of the flat wire motor 100. The plurality of rows of soldered end heads T are arranged at intervals along the circumferential direction of the flat wire motor 100 in sequence, and two rows of soldered end heads T arranged at intervals along the circumferential direction of the flat wire motor 100 are shown in two square dashed lines. The plurality of flat wires 21 corresponding to each row of soldered end heads T are used to transmit the same phase alternating current, and the soldered end heads T adjacent along the radial direction of the flat wire motor 100 are of the same phase, which can reduce the voltage difference between the soldered end heads T adjacent along the radial direction.

[0067] As shown in Fig. 3b, one row of welding heads T includes three welding heads T arranged along the radial direction of the flat wire motor 100, each welding head T is formed by welding the welding end t of two flat wires 21 along the radial direction of the flat wire motor 100, and one row of welding heads T includes six welding ends t of flat wires 21.

[0068] As shown in Fig. 3b, the six welding ends t are arranged along the radial direction of the flat wire motor 100, and the layer where the welding end t close to the outer circumferential surface of the stator core 1 is defined as the first layer S1. The six welding ends t are arranged in the first layer S1, the second layer S2, the third layer S3, the fourth layer S4, the fifth layer S5, and the sixth layer S6 along the radial direction of the flat wire motor 100 from the outer circumferential surface of the stator core 1 to the center. The welding end t in the first layer S1 is welded to the welding end t in the second layer S2, the welding end t in the third layer S3 is welded to the welding end t in the fourth layer S4, and the welding end t in the fifth layer S5 is welded to the welding end t in the sixth layer S6. In one embodiment, the shape of the welding end t of each flat wire 21 is shown in Fig. 3b.

[0069] As shown in Fig. 3b, the multiple rows of welding heads T of the stator winding 2 are divided into multiple groups of welding heads T along the circumferential direction of the flat wire motor 100. Two groups of welding heads T adjacent along the circumferential direction of the flat wire motor 100 are divided by one interruption line, and one group of welding heads T is between two interruption lines adjacent along the circumferential direction of the flat wire motor 100. The multiple rows of welding heads T in each group of welding heads T are sequentially arranged adjacent along the circumferential direction of the flat wire motor 100, and the multiple flat wires 21 corresponding to each group of welding heads T are used to transmit the same phase alternating current. Two groups of welding heads T adjacent along the circumferential direction of the flat wire motor 100 are used to transmit different phase alternating currents.

[0070] As shown in Fig. 3b, each interruption line has two groups of welding heads T on both sides along the circumferential direction of the flat wire motor 100, and the two groups of welding heads T are used to transmit different phase alternating currents. The welding heads T of different phases are arranged in different regions along the circumferential direction of the flat wire motor 100, so as to reduce the voltage difference between the welding heads T adjacent along the circumferential direction.

[0071] Fig. 4a shows a part of the structure of one flat wire 21 and the stator core 1. The flat wire 21 is accommodated in one winding slot 12 of the stator core 1, and one end of the flat wire 21 protrudes from the first end surface M1 of the stator core 1. The end of the flat wire 21 exposed from the first end surface M1 is the welding end t. For the convenience of understanding, the flat wire 21 includes a straight line segment 211 and a broken line segment 212 exposed from the first end surface M1. The straight line segment 211 is parallel to the axial direction of the flat wire motor 100 and is accommodated in the winding slot 12. The broken line segment 212 protrudes out of the winding slot 12. The broken line segment 212 is bent relative to the straight line segment 211 to extend along the circumferential direction of the flat wire motor 100 and is welded to another flat wire 21 to form a welding head T.

[0072] Figure 4b shows a structure in which two flat wires 21 expose one end of the first end surface Ml of the stator core 1 to form a welded end head T. As shown in Figure 4b, the straight segment 211a of one flat wire 21 is accommodated in the winding slot 12a, and the bent segment 212a is exposed to the first end surface Ml and extends along the circumferential direction of the flat motor 100. The straight segment 211b of the other flat wire 21 is accommodated in the winding slot 12b, and the bent segment 212b is exposed to the first end surface Ml and extends along the circumferential direction of the flat motor 100. The welded end t1 of the bent segment 212a and the welded end t2 of the bent segment 212b are welded along the radial direction of the flat motor 100 to form a welded end head T. The extension direction of the bent segment 212a along the circumferential direction of the flat motor 100 is opposite to the extension direction of the bent segment 212a along the circumferential direction of the flat motor 100, so that the welds t of the two bent segments 212 can form a welded end head T. Among them, each welded end head T corresponds to two flat wires 21 arranged in two different winding slots 12, i.e. the straight segment 211a is located in the winding slot 12a, and the straight segment 211b is located in the winding slot 12b. The number of layers of the straight segment 211a in the winding slot 12a is different from the number of layers of the straight segment 211b in the winding slot 12b.

[0073] In an embodiment, the flat motor 100 includes a 54-slot 6-layer 6-pole motor stator 10. Among them, the pitch y of the stator winding 2 is 9, and the angle occupied by the winding slot 12 corresponding to the pitch y along the circumferential direction of the flat motor 100 is about 60°. The winding slots 12 in which the two flat wires 21 corresponding to the welded end head T are located are spaced apart from the winding slot 12b in which the straight segment 211b is located by 8 winding slots 12. The sum of the slot numbers of the winding slots 12 across which the bent segment 212a and the bent segment 212b extend along the circumferential direction of the flat motor 100 is about 9, and the difference between the slot numbers of the two winding slots 12 is 9.

[0074] The flat motor 100 provided by the embodiments of the present application includes a plurality of welded end heads T located at the first end surface Ml of the stator core 1. The flat wires 21 corresponding to the welded end heads T adjacent along the radial direction of the flat motor 100 are used to transmit the same phase current. In an embodiment, the flat motor 100 also has welding points at the second end surface M2 of the stator core 1, so that the welding points at the second end surface M2 correspond to the flat wires 21 adjacent along the radial direction of the flat motor 100, which are used to transmit the same phase current, thereby reducing the voltage difference between the welding points of different phases.

[0075] The welding ends t of the plurality of flat wires 21 of the flat wire motor 100 are arranged and welded according to a set rule, and the welding end heads T arranged along the radial direction of the flat wire motor 100 belong to the same phase, so that the arrangement mode of the flat wires 21 in the winding slot 12 of the stator core 1 does not need to be adjusted, and the welding ends t of the flat wires 21 exposed to the first end surface M1 of the stator core 1 can be pulled and head-welded according to the arrangement scheme of the final welding end heads T.

[0076] In an embodiment, the flat wire 21 of the motor stator 10 includes a straight line segment 211, a folded line segment 212, and a connecting segment 213. As shown in FIG. 5a, the folded line segment 212 and the connecting segment 213 are connected to the two ends of the straight line segment 211, respectively.

[0077] As shown in FIG. 5a, the straight line segment 211 of the flat wire 21 is accommodated in a winding slot 12 of the stator core 1, and the folded line segment 212 is exposed to one of the axial end surfaces M of the stator core 1, i.e., the first end surface M1. The connecting segment 213 of the flat wire 21 is exposed to the other axial end surface M of the stator core 1, i.e., the second end surface M2. The welding end t of the folded line segment 212 is used to be welded with the welding end t of another flat wire 21 to form a welding end head T. At the second end surface M2 of the stator core 1, the end q of the connecting segment 213 can also be used to connect the end of another flat wire 21. As a structural deformation, a conductor similar to that shown in FIG. 5a has a straight welding end t parallel to the axial direction of the flat wire motor 100, as shown in FIG. 5b. The end q of the connecting segment 213 is in a straight line type.

[0078] In an embodiment, the flat wire 21 of the motor stator 10 includes two straight line segments 211, two folded line segments 212, and a cross line segment 214. As shown in FIG. 6a, the two straight line segments 211 are connected to the two ends of the cross line segment 214, and each straight line segment 211 is connected between the cross line segment 214 and one folded line segment 212.

[0079] As shown in FIG. 6a, the two straight line segments 211 of the flat wire 21 are accommodated in two different winding slots 12 of the stator core 1, and each folded line segment 212 is exposed to the same axial end surface M of the stator core 1, i.e., the first end surface M1. The cross line segment 214 of the flat wire 21 is exposed to the other axial end surface M of the stator core 1, i.e., the second end surface M2, and the cross line segment 214 is connected to one end of the two straight line segments 211 close to the second end surface M2. The welding end t of each folded line segment 212 is used to be welded with the welding end t of another flat wire 21 to form a welding end head T. As a structural deformation, a conductor similar to that shown in FIG. 5a has a straight welding end t parallel to the axial direction of the flat wire motor 100, as shown in FIG. 5b.

[0080] Figure 7a is a schematic diagram of a partial structure of a stator of a flat wire motor according to an embodiment of the present application. As shown in Figure 7a, the partial structure of the stator 10 of the motor, a plurality of flat wires 21 are arranged in each winding slot 12 of the stator core 1.

[0081] In an embodiment, six flat wires are arranged in each winding slot 12 along the radial direction of the flat wire motor 100. The layers of the flat wires 21 near the outer circumferential surface of the stator core 1 are defined as the first layer L1. The six flat wires 21 are arranged in the first layer L1, the second layer L2, the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6 along the radial direction of the flat wire motor 100 from the outer circumferential surface of the stator core 1 to the center. In an embodiment, the number of layers of the flat wires 21 in each winding slot 12 is shown in Figure 7a.

[0082] In an embodiment, the plurality of flat wires 21 included in the stator winding 2 can be connected in groups to form m-phase windings, where m can be 2, 3, 4, 5, or 6, i.e., the number of phases of the corresponding flat wire motor can be two-phase, three-phase, four-phase, five-phase, or six-phase or more. Taking a three-phase winding as an example, the stator winding 2 can be divided into a first phase winding, a second phase winding, and a third phase winding, corresponding to a U-phase winding, a V-phase winding, and a W-phase winding, respectively. In the m-phase winding, any phase winding can include a plurality of phase units, and when connected, the phase units of the first phase winding, the phase units of the second phase winding, and the phase units of the third phase winding are arranged in sequence along the inner wall of the stator core. Each phase unit of each phase winding is a pole phase, and the number of slots of the winding slot 12 corresponding to each phase unit is the number of slots per pole per phase.

[0083] The flat wire motor 100 provided by the embodiments of the present application is a short-pitch winding motor, and the plurality of flat wires 21 arranged in some winding slots 12 of the stator core 1 belong to different phases. Taking a 54-slot 6-layer 6-pole motor stator 10 as an example, Figure 7b shows the phase belt distribution of the stator winding 2 of the motor stator 10.

[0084] As shown in Figure 7b, the stator winding 2 includes a U-phase winding, a V-phase winding, and a W-phase winding, which are shown in different shades, respectively. Each square represents a part of a flat wire 21 in a winding slot 12, and the numbers are the slot numbers of the winding slots 12. The dashed line box illustrates a phase unit D of the U-phase winding, and the phase belt units of the U-phase winding, the V-phase winding, and the W-phase winding are periodically arranged along the circumferential direction of the flat wire motor 100. Each phase unit D includes at least two phase belts d, and any two adjacent phase belts d along the radial direction of the flat wire motor 100 are staggered by one winding slot 12 along the circumferential direction of the flat wire motor 100.

[0085] In one embodiment, each phase unit D includes three phase belts d, each phase belt d includes two layers of flat wires 21. Each layer of flat wires 21 includes 3 flat wires 21 arranged adjacent to each other in the circumferential direction of the flat wire motor 100. As shown in FIG. 5b, each phase winding includes 6 layers of flat wires 21, and the layers of flat wires 21 in the winding slot 12 are respectively the first layer LI, the second layer L2, the third layer L3, the fourth layer L4, the fifth layer L5, and the sixth layer L6.

[0086] In one embodiment, each phase unit D includes three phase belts d. In the circumferential direction of the flat wire motor 100, the flat wires 21 corresponding to one phase unit D occupy 5 winding slots 12.

[0087] Please continue to refer to FIG. 7b, each winding slot 12 of the stator core 1 contains 6 flat wires 21, and in some winding slots 12, the 6 flat wires 21 are all of one phase, and in other winding slots 12, the 6 flat wires 21 are divided into two phases.

[0088] In one embodiment, the 6 flat wires 21 in the 17th winding slot 12 are all of the U phase, the 6 flat wires 21 in the 15th winding slot 12 include 2 U phases and 4 V phases, and the 6 flat wires 21 in the 16th winding slot 12 include 2 V phases and 4 U phases. For one phase unit D of the same phase, the 18 flat wires 21 are distributed in 5 winding slots 12 arranged in the circumferential direction of the flat wire motor 100 in turn, and are distributed in 6 layers in the radial direction of the flat wire motor 100.

[0089] FIG. 8a shows the structure of one phase winding of the flat wire motor 100 described above, wherein the phase winding includes a plurality of flat wires 21 shown in FIG. 6b, and the plurality of flat wires 21 are wound into a phase winding in the regularity shown in FIG. 7b. As shown in FIG. 8a, the phase winding includes a plurality of welded end heads T, and the positions indicated by R2 and the positions indicated by R3 are two groups of welded end heads T. The plurality of welded end heads T of the phase winding are arranged at intervals in the circumferential direction of the flat wire motor 100. Each welded end head T is formed by welding the welded ends t of two flat wires 21 in the radial direction of the flat wire motor 100, and each welded end t is the end of the broken line segment 212 of the flat wire 21. It should be understood that the three phase windings of the flat wire motor 100, the U phase winding, the V phase winding, and the W phase winding all have the structure shown in FIG. 8a.

[0090] Please continue to refer to the dashed box shown in FIG. 8a, the straight-line segments 211 of the plurality of flat wires 21 between two groups of the welding terminals T adjacent in the circumferential direction of the flat wire motor 100 are arranged in five groups, each group of the straight-line segments 211 is located in a same winding slot 12, and the number of the straight-line segments 211 in each group is not necessarily the same. It should be understood that the distribution state of the straight-line segments 211 of the plurality of flat wires 21 of each phase winding in the winding slot 12 is the phase belt distribution shown in FIG. 7b. The arrangement mode of the straight-line segments 211 of the plurality of flat wires 21 between two groups of the welding terminals T adjacent in the circumferential direction of the flat wire motor 100 can refer to the distribution state of the flat wires 21 included in one phase belt in FIG. 7b.

[0091] FIG. 8b shows an enlarged view of the detail at R2 in FIG. 8a. As shown in FIG. 8b, each group of the welding terminals T includes three rows of the welding terminals T, and a dashed box schematically shows one row of the welding terminals T. The row of the welding terminals T includes three welding terminals T arranged at intervals in the radial direction of the flat wire motor 100, and each welding terminal T is formed by welding of the welding ends t of two flat wires 21 in the radial direction of the flat wire motor 100. One group of the welding terminals T includes three rows of the welding terminals T shown in the dashed box.

[0092] FIG. 8c shows an enlarged view of the detail at R3 in FIG. 8b. As shown in FIG. 8c, each lead-out wire Q includes at least a section of structure parallel to the axial direction of the flat wire motor 100, and the section of structure of the lead-out wire Q is arranged adjacent to one row of the welding terminals T of the same phase in the radial direction of the flat wire motor 100, so as to reduce the voltage difference between the lead-out wire Q and the welding terminals T. In the axial direction of the flat wire motor 100, the height of the lead-out wire Q is higher than the height of the welding end t of each flat wire 21, so as to facilitate wiring and busbar connection of the lead-out wire Q. In one embodiment, the shape of the lead-out wire Q is shown in FIG. 8c.

[0093] In the flat wire motor 100 provided by the embodiments of the present application, each phase winding includes two wires as shown in FIG. 9, and the two wires can be connected in parallel or in series to form one phase winding. Each wire includes a plurality of flat wires 21 connected end to end, and the end portions of the two flat wires 21 located at both ends of the wire form lead-out wires Q. The two wires shown in FIG. 9 are rotated by 30° in the circumferential direction of the flat wire motor 100 to cooperatively form one phase winding. As shown in FIG. 9, the two lead-out wires Q of each wire are located in a same group of the welding terminals T, the two lead-out wires Q are arranged at intervals in the radial direction of the flat wire motor 100, and two welding terminals T are arranged between the two lead-out wires Q.

[0094] Please continue to refer to Figure 9, the plurality of flat wires 21 corresponding to each group of welding tips T, half of which extends to the left side along the circumference of the flat wire motor 100, and half of which extends to the right side along the circumference of the flat wire motor 100. The straight line segments 211 of the plurality of flat wires 21 on each side are distributed in 5 winding slots 12, and the flat wires 211 in the same winding slot 12 are represented by a dashed box. Specifically, the middle group of straight line segments 211 is schematically shown by a dashed box c1, the two groups of straight line segments 211 on the outermost sides are schematically shown by dashed boxes c3, and the two groups of straight line segments 211 on the two sides of the middle straight line segments 211 are schematically shown by dashed boxes c2. The straight line segments 211 of the three flat wires 21 shown by the dashed box c1, the straight line segments 211 of the two flat wires 21 shown by the dashed box c2, and the straight line segments 211 of the one flat wire 21 shown by the dashed box c3. When two conductors included in a phase winding cooperate to form a phase winding, the straight line segments 211 of one group of dashed boxes c1 of one conductor and the straight line segments 211 of one group of dashed boxes c1 of another conductor are distributed in one winding slot 12, the straight line segments 211 of one group of dashed boxes c2 of one conductor and the straight line segments 211 of one group of dashed boxes c2 of another conductor are distributed in one winding slot 12, and the straight line segments 211 of one group of dashed boxes c3 of one conductor and the straight line segments 211 of one group of dashed boxes c3 of another conductor are distributed in one winding slot 12.

[0095] Based on the above-mentioned phase belt distribution of the stator winding 2 of the flat wire motor 100 and the structure of the flat wire 21, taking a 54-slot 6-layer 6-pole motor stator 10 with a short-pitch winding as an example, Figure 10 is a schematic diagram of the partial phase belt d distribution of the U-phase winding in the flat wire motor 100 provided by the embodiment of the application. As shown in Figure 10, a black dot represents a welding tip T, and each welding tip T is formed by welding the end portions of two U-phase flat wires 21. The welding tips T of the U-phase winding are distributed in multiple groups along the circumference of the flat wire motor 100, and each group of welding tips T is schematically shown by a dashed box. Each group of welding tips T of the U-phase winding includes multiple rows of welding tips T arranged in sequence and adjacent along the circumference of the flat wire motor 100, and each row of welding tips T includes three welding tips T arranged at intervals along the radial direction of the flat wire motor 100.

[0096] With reference to FIG. 10 and FIG. 11a, one dashed line and one solid line connected by each welding end head T are two flat wires 21, and the two flat wires 21 corresponding to each welding end head T are arranged in two different layers in two different winding slots 12, and the layers are different by 1. As shown in FIG. 11a, the two flat wires 21 corresponding to one welding end head T are arranged in the winding slot 12, and the slot number of the winding slot 12 where one flat wire 21 is located is 6, and the slot number of the winding slot 12 where the other flat wire 21 is located is 15, and the difference between the two winding slots 12 is 9. One of the flat wires 21 is arranged in the first layer L1 in the winding slot 12, and the other flat wire 21 is arranged in the second layer L2 in the winding slot 12, so as to realize the cross-layer along the radial direction of the flat wire motor 100 of the U-phase winding.

[0097] Please continue to refer to FIG. 11a, the two flat wires 21 corresponding to one welding end head T are arranged in the same layer along the circumferential direction of the flat wire motor 100, and the two flat wires 21 corresponding to another welding end head T adjacent to the one welding end head T along the circumferential direction of the flat wire motor 100 are arranged in the same layer along the circumferential direction of the flat wire motor 100. For a group of welding end heads T, the flat wires 21 corresponding to the welding end heads T adjacent to each other along the circumferential direction of the flat wire motor 100 are arranged in sequence along the circumferential direction of the flat wire motor 100, which is beneficial to reduce the size of the end portion of the stator winding. FIG. 11a shows three welding end heads T arranged adjacent to each other along the circumferential direction of the flat wire motor 100 in a group of welding end heads T.

[0098] With reference to FIG. 10 and FIG. 11b, in the same phase unit, the flat wires 21 of the two phase belts d adjacent to each other along the radial direction of the flat wire motor 100 are arranged in the same layer along the circumferential direction of the flat wire motor 100, and the two phase belts d are shown in a dashed box. In the two welding end heads T adjacent to each other along the radial direction of the flat wire motor 100, the two flat wires 21 corresponding to one welding end head T are arranged in the same layer along the circumferential direction of the flat wire motor 100, and the two flat wires 21 corresponding to the other welding end head T are arranged in the same layer along the circumferential direction of the flat wire motor 100.

[0099] In one embodiment, the two flat wires 21 corresponding to one welding end head T1 are flat wire 21m and flat wire 21n, and the two flat wires 21 corresponding to another welding end head T2 are flat wire 21m' and flat wire 21n'. Along the circumferential direction of the flat wire motor 100, the flat wire 21m and the flat wire 21m' are arranged in the same layer along the circumferential direction of the flat wire motor 100, and the flat wire 21n and the flat wire 21n' are arranged in the same layer along the circumferential direction of the flat wire motor 100. Along the radial direction of the flat wire motor 100, the layer number of the flat wire 21m in the winding slot 12 is different from the layer number of the flat wire 21m' in the winding slot 12 by 2, and the layer number of the flat wire 21n in the winding slot 12 is different from the layer number of the flat wire 21n' in the winding slot 12 by 2.

[0100] Please continue to refer to FIG. 11b, along the radial direction of the flat wire motor 100, the distance between each welding end T and the corresponding winding slot 12 along the circumferential direction of the flat wire motor 100 is not equal, and the distance between each welding end T and the corresponding another winding slot 12 along the circumferential direction of the flat wire motor 100 is not equal. Taking two welding ends T arranged along the radial direction of the flat wire motor 100 as an example, the distance between the welding end T close to the center of the stator core 1 and the corresponding winding slot 12 along the circumferential direction of the flat wire motor 100 is smaller than the distance between the welding end T far from the center of the stator core 1 and the corresponding winding slot 12 along the circumferential direction of the flat wire motor 100, and the distance between the welding end T close to the center of the stator core 1 and the corresponding another winding slot 12 along the circumferential direction of the flat wire motor 100 is smaller than the distance between the welding end T far from the center of the stator core 1 and the corresponding another winding slot 12 along the circumferential direction of the flat wire motor 100. In FIG. 11b, welding end T1 and welding end T2 are taken as examples, welding end T1 is a welding end T far from the center of the stator core 1, and welding end T2 is a welding end T close to the center of the stator core 1.

[0101] In an embodiment, the distance between welding end T1 and the winding slot 12 where the corresponding one flat wire 21m is located is about 5.5 slot pitches, the distance between welding end T1 and the winding slot 12 where the corresponding another flat wire 21n is located is about 3.5 slot pitches, and the distance between the winding slot 12 where the flat wire 21m is located and the winding slot 12 where the flat wire 21n is located is 9 slot pitches. The distance between welding end T2 and the winding slot 12 where the corresponding one flat wire 21m' is located is about 4.5 slot pitches, the distance between welding end T2 and the winding slot 12 where the corresponding another flat wire 21n' is located is about 4.5 slot pitches, and the distance between the winding slot 12 where the flat wire 21m' is located and the winding slot 12 where the flat wire 21n' is located is 9 slot pitches. Wherein, one slot pitch is the distance between the centers of two winding slots 12 along the circumferential direction of the motor, and the number of slot pitches can be used to represent the number of winding slots 12.

[0102] Further referring to Fig. 11c, for the welding tips T included in one row of welding tips T, the distance between each welding tip T and the corresponding one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100 is not equal, and the distance between each welding tip T and the corresponding other one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100 is not equal. In each row of welding tips T, the distance between the welding tip T closer to the center of the stator core 1 and the corresponding one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100 is smaller than the distance between the welding tip T farther from the center of the stator core 1 and the corresponding one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100, and the distance between the welding tip T closer to the center of the stator core 1 and the corresponding other one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100 is smaller than the distance between the welding tip T farther from the center of the stator core 1 and the corresponding other one of the slots 12 in which the flat wire 21 is located along the circumferential direction of the flat wire motor 100.

[0103] In one embodiment, one row of welding tips T includes the welding tip T1, the welding tip T2, and the welding tip T3 arranged in sequence along the radial direction of the flat wire motor 100. The distance between the welding tip T1 and the slot 12 in which the corresponding one of the flat wires 21m is located is about 5.5 slot pitches, the distance between the welding tip T1 and the slot 12 in which the corresponding other one of the flat wires 21n is located is about 3.5 slot pitches, and the distance between the slot 12 in which the flat wire 21m is located and the slot 12 in which the flat wire 21n is located is 9 slot pitches. The distance between the welding tip T2 and the slot 12 in which the corresponding one of the flat wires 21m’ is located is about 4.5 slot pitches, the distance between the welding tip T2 and the slot 12 in which the corresponding other one of the flat wires 21n’ is located is about 4.5 slot pitches, and the distance between the slot 12 in which the flat wire 21m’ is located and the slot 12 in which the flat wire 21n’ is located is 9 slot pitches. The distance between the welding tip T3 and the slot 12 in which the corresponding one of the flat wires 21m” is located is about 3.5 slot pitches, the distance between the welding tip T3 and the slot 12 in which the corresponding other one of the flat wires 21n” is located is about 5.5 slot pitches, and the distance between the slot 12 in which the flat wire 21m” is located and the slot 12 in which the flat wire 21n” is located is 9 slot pitches.

[0104] The flat wire motor 100 provided in the embodiments of the present application has the welding tips t of the flat wires 21 exposed to the first end surface M1 of the stator core 1 drawn and head-welded according to certain rules, so that the welding tips T of the same phase can be arranged along the radial direction of the flat wire motor 100 to reduce the voltage difference. The drawing and head-welding of the flat wires 21 are preferably performed with the smallest distance, which can reduce the material consumption of the flat wires 21 and is also conducive to reducing the size of the end portion of the stator winding 2. The flat wire motor 100 provided in the embodiments of the present application has one group of welding tips T arranged between two groups of circumferentially adjacent flat wires 21.

[0105] In the flat wire motor 100 provided by the embodiments of the present application, each welding end T corresponds to one flat wire 21 located at an odd layer and one flat wire 21 located at an even layer. The three welding ends T included in each row of welding ends T correspond to a plurality of flat wires 21 located at odd layers and a plurality of flat wires 21 located at even layers. In one embodiment, the flat wires 21 located at odd layers cross to the left, and the flat wires 21 located at even layers cross to the right.

[0106] wherein the plurality of flat wires 21 located at odd layers corresponding to each row of welding ends T satisfy the following condition:

[0107] The plurality of flat wires 21 located at even layers corresponding to each row of welding ends T satisfy the following condition:

[0108] wherein y 2k-1 is the slot number between the winding slot 12 where the flat wire 21 located at the 2k-1 layer and the corresponding welding end T, y 2k is the slot number between the winding slot 12 where the flat wire 21 located at the 2k layer and the corresponding welding end T, S 2k-1 is the slot number of the winding slot 12 where the flat wire 21 located at the 2k-1 layer, S 2k is the slot number of the winding slot 12 where the flat wire 21 located at the 2k layer, S0 is the average of the sum of the slot numbers of the winding slots 12 where the plurality of flat wires 21 located at odd layers, S 0′ is the average of the sum of the slot numbers of the winding slots 12 where the plurality of flat wires 21 located at even layers, y is the pitch of the stator winding 2, and k is an integer greater than or equal to 1. The slot number of the winding slot 12 where the flat wire 21 is located can also be considered as the slot position of the winding slot 12.

[0109] In combination with FIG. 11c, one flat wire 21m corresponding to the welding end T1 is located at the winding slot 12 No. 6, at the second layer L2. Another flat wire 21n corresponding to the welding end T1 is located at the winding slot 12 No. 15, at the first layer L1. One flat wire 21m’ corresponding to the welding end T2 is located at the winding slot 12 No. 7, at the fourth layer L4. Another flat wire 21n’ corresponding to the welding end T2 is located at the winding slot 12 No. 16, at the third layer L3. One flat wire 21m” corresponding to the welding end T3 is located at the winding slot 12 No. 8, at the sixth layer L6. Another flat wire 21n” corresponding to the welding end T2 is located at the winding slot 12 No. 17, at the fifth layer L5.

[0110] The slot numbers of the three winding slots 12 in which the odd-layer flat wires 21 are located are 15, 16, 17 respectively, and the average of the slot numbers of the three winding slots 12 is 16. The slot distance number of the flat wire 21n in the first layer L1 along the left cross line of the flat motor 100 is 15-16+4.5=3.5. The slot distance number of the flat wire 21n' in the third layer L3 along the left cross line of the flat motor 100 is 16-16+4.5=4.5. The slot distance number of the flat wire 21n" in the fifth layer L3 along the left cross line of the flat motor 100 is 17-16+4.5=5.5.

[0111] The slot numbers of the three winding slots 12 in which the odd-layer flat wires 21 are located are 15, 16, 17 respectively, and the average of the slot numbers of the three winding slots 12 is 16. The slot distance number of the flat wire 21n in the first layer L1 along the left cross line of the flat motor 100 is 15-16+4.5=3.5. The slot distance number of the flat wire 21n' in the third layer L3 along the left cross line of the flat motor 100 is 16-16+4.5=4.5. The slot distance number of the flat wire 21n" in the fifth layer L3 along the left cross line of the flat motor 100 is 17-16+4.5=5.5.

[0112] In an embodiment, the three welding heads T included in each row of welding heads T correspond to six flat wires 21, among which the flat wires 21 in odd layers cross to the right, and the flat wires 21 in even layers cross to the left. The cross directions of the two flat wires 21 corresponding to each welding head T are opposite.

[0113] As shown in FIGS. 10 and 11d, among the two rows of welding heads T adjacent in the circumferential direction of the flat motor 100, one welding head T in one row of welding heads T and one welding head T in the other row of welding heads T are arranged adjacent in the circumferential direction of the flat motor 100.

[0114] As shown in FIG. 11d, one row of welding heads T indicated by P1 and one row of welding heads T indicated by P2 each include three welding heads T arranged at intervals in the radial direction of the flat motor 100, and one welding head T in P1 and one welding head T in P2 are arranged adjacent in the circumferential direction of the flat motor 100. The two rows of welding heads T occupy similar radial widths at the end of the motor stator 10, and when all the welding heads T occupy similar radial widths at the end of the motor stator 10, it is beneficial to reduce the size of the stator winding 2, and further beneficial to reduce the volume of the motor stator 10.

[0115] As shown in FIG. 10 and FIG. 11e, a plurality of flat wires 21 of the same phase are arranged between two groups of welding terminals T of the same phase which are adjacent and of the same phase along the circumferential direction of the flat wire motor 100. The plurality of flat wires 21 can be considered as a phase unit D. The plurality of flat wires 21 corresponding to one row of welding terminals T in one group of welding terminals T and the plurality of flat wires 21 corresponding to one row of welding terminals T in another group of welding terminals T and of the same layer are arranged adjacent along the radial direction of the flat wire motor 100. The plurality of flat wires 21 can be considered as a phase belt d.

[0116] The above embodiment describes the winding mode of the winding of the U-phase winding. The V-phase winding and the W-phase winding also comply with the winding rules described above. As shown in FIG. 12, the welding terminals T of the three-phase winding of the flat wire motor 100 are arranged alternately along the circumferential direction of the flat wire motor 100. Any three groups of welding terminals T adjacent along the circumferential direction of the flat wire motor 100 are used to transmit three-phase alternating current.

[0117] In the figure, the welding terminals T of the U-phase winding are shown as black solid dots, and the corresponding flat wires 21 are shown as straight lines. The welding terminals T of the V-phase winding are shown as gray solid dots, and the corresponding flat wires 21 are shown as dashed lines with small intervals. The welding terminals T of the W-phase winding are shown as hollow dots, and the corresponding flat wires 21 are shown as dashed lines with large intervals. Between two groups of welding terminals T of the same phase which are adjacent along the circumferential direction of the flat wire motor 100, two groups of welding terminals T of another two-phase winding are arranged, for example, between two groups of welding terminals T of the U-phase which are adjacent along the circumferential direction of the flat wire motor 100, a group of welding terminals T of the W-phase and a group of welding terminals T of the V-phase are arranged.

[0118] In one embodiment, along the circumferential direction of the flat wire motor 100, the distance h1 between two adjacent rows of welding terminals T of the same group is configured to be smaller than the distance h2 between two adjacent rows of welding terminals T of different groups. Taking a group of welding terminals T of the V-phase and a group of welding terminals T of the U-phase which are adjacent along the circumferential direction of the flat wire motor 100 as an example, the distance h1 between two adjacent welding terminals T of the group of welding terminals T of the V-phase can be smaller than the distance h2 between one welding terminal T of the V-phase and one welding terminal T of the U-phase which are adjacent along the circumferential direction of the flat wire motor 100. The two-phase welding terminals T are far away from each other along the circumferential direction of the flat wire motor 100, further reducing the voltage difference between the welding terminals T of different phases.

[0119] In summary, the flat wire motor 100 provided by the embodiments of the present application adjusts the cross-line distance of the welding end t of the flat wire 21 of different phases along the circumference of the flat wire motor 100, so that the welding end heads T adjacent along the radial direction of the flat wire motor 100 belong to the same phase, the welding end heads T of different phases can be arranged in different regions along the circumference of the flat wire motor 100 according to different phases, the distance between the welding end heads T of different phases is increased, so as to reduce the voltage difference of the welding end heads T of different phases, and reduce the influence on the performance and safety of the flat wire motor 100. This scheme only needs to design and arrange the welding end t of the flat wire 21, does not need additional manufacturing processes and assembly steps, and does not need additional auxiliary structures, and will not increase the volume and weight of the flat wire motor 100, has low cost, and has good application prospect. In some embodiments, compared with the traditional flat wire motor, the voltage difference between the welding end heads T adjacent along the radial direction of the flat wire motor 100 provided by the embodiments of the present application can be reduced by about 40%, and the high-voltage flat wire motor 100 can be exempted from the welding point coating treatment, thereby saving about 20 yuan of manufacturing cost.

[0120] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A flat wire motor, characterized by, The flat wire motor comprises a motor rotor and a motor stator, the motor stator comprises a stator core and a stator winding, the stator winding comprises a plurality of flat wires, the stator core comprises a plurality of winding slots, each winding slot is used for accommodating a plurality of flat wires, the plurality of flat wires in the same winding slot are sequentially arranged along the radial direction of the flat wire motor, and one end of each flat wire accommodated by the plurality of winding slots is exposed on the same side of the stator core. The stator winding comprises a plurality of welding end heads, each welding end head is formed by welding the one end of two flat wires, and the two flat wires corresponding to each welding end head are arranged in two different winding slots. The plurality of welding end heads are divided into a plurality of rows of welding end heads along the radial direction of the flat wire motor, a plurality of welding end heads in each row of welding end heads are arranged at intervals along the radial direction of the flat wire motor, and the plurality of rows of welding end heads are sequentially and at intervals arranged along the circumferential direction of the flat wire motor. The plurality of rows of welding end heads are divided into a plurality of groups of welding end heads along the circumferential direction of the flat wire motor, a plurality of rows of welding end heads in each group of welding end heads are sequentially and adjacently arranged along the circumferential direction of the flat wire motor, a plurality of flat wires corresponding to each group of welding end heads are used for transmitting alternating current of the same phase, and two groups of welding end heads adjacent along the circumferential direction of the flat wire motor are respectively used for transmitting alternating current of different phases.

2. The flat wire motor of claim 1, wherein The two flat wires corresponding to each welding end head are arranged in two different winding slots, and the number of layers of the two flat wires is different by 1.

3. A flat wire motor according to claim 1 or 2, characterized in that In the two welding end heads adjacent along the radial direction of the flat wire motor, the two flat wires corresponding to one welding end head and the two flat wires corresponding to the other welding end head are respectively staggered by one winding slot along the circumferential direction of the flat wire motor.

4. A flat wire motor according to any one of claims 1-3, characterized in that In the two rows of welding end heads adjacent along the circumferential direction of the flat wire motor, one welding end head in one row of welding end heads and one welding end head in the other row of welding end heads are arranged adjacently along the circumferential direction of the flat wire motor.

5. A flat wire motor according to any one of claims 1-4, characterized in that The two flat wires corresponding to one welding end head and the two flat wires corresponding to the other welding end head adjacent along the circumferential direction of the flat wire motor are respectively staggered by one winding slot and arranged in the same layer along the circumferential direction of the flat wire motor.

6. A flat wire motor according to any one of claims 1-5, characterized in that Along the circumferential direction of the flat wire motor, the distance between two rows of welding end heads adjacent in the same group is smaller than the distance between two rows of welding end heads adjacent in different groups.

7. A flat wire motor according to any one of claims 1-6, characterized in that The flat wire motor is a three-phase motor, and any three groups of welding end heads sequentially adjacent along the circumferential direction of the flat wire motor are respectively used for transmitting three-phase alternating current.

8. The flat wire motor of claim 7, wherein The stator winding comprises a plurality of lead wires for connecting phase electricity, each lead wire is located on the same side of the stator core as the plurality of welding end heads, and at least a part of each lead wire is arranged adjacent to a row of welding end heads of the same phase along the radial direction of the flat wire motor.

9. A flat wire motor according to any one of claims 1-8, characterized in that In each row of welding end heads, the distance between each welding end head and the winding slot in which the corresponding one of the flat wires is located along the circumferential direction of the flat wire motor is not equal, and the distance between each welding end head and the winding slot in which the corresponding other one of the flat wires is located along the circumferential direction of the flat wire motor is not equal.

10. The flat wire motor of claim 9, wherein In each row of the welding end, the distance between the welding end close to the center of the stator core and the corresponding winding slot along the circumferential direction of the flat wire motor is less than the distance between the welding end far from the center of the stator core and the corresponding winding slot along the circumferential direction of the flat wire motor, and the distance between the welding end close to the center of the stator core and the corresponding winding slot along the circumferential direction of the flat wire motor is greater than the distance between the welding end far from the center of the stator core and the corresponding winding slot along the circumferential direction of the flat wire motor.

11. A flat wire motor according to claim 9 or 10, characterized in that The plurality of flat wires corresponding to each row of the welding tip satisfies the following condition: wherein the y 2k-1 is the slot number of the winding slot where the flat wire of the 2k-1 layer is located, the y 2k is the slot number of the winding slot where the flat wire of the 2k layer is located, the S 2k-1 is the slot number of the winding slot where the flat wire of the 2k-1 layer is located, the S 2k is the slot number of the winding slot where the flat wire of the 2k layer is located, the S0 is the average of the sum of the slot numbers of the winding slots where the flat wires of the odd layers are located, the S 0′ is the average of the sum of the slot numbers of the winding slots where the flat wires of the even layers are located, the y is the pitch of the stator winding, and the k is an integer greater than or equal to 1.

12. A flat wire motor according to any one of claims 1-11, characterized in that A plurality of flat wires in the same phase are arranged between two groups of welding ends adjacent and in the same phase along the circumferential direction of the flat wire motor, and the plurality of flat wires corresponding to one group of welding ends are arranged adjacent to the plurality of flat wires in the same layer corresponding to the other group of welding ends along the radial direction of the flat wire motor.

13. A powertrain, characterized by, The flat wire motor according to any one of claims 1-12 is drivingly connected with a speed reducer.

14. A vehicle characterized by comprising: The power assembly according to claim 13 is drivingly connected with a transmission mechanism, and the transmission mechanism drives the wheels.

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