Flat wire motor, power assembly and vehicle

Abstract

The invention relates to the technical field of motors, in particular to a flat wire motor, a power assembly and a vehicle. The stator winding of the flat wire motor comprises a plurality of welding ends, each welding end is formed by welding one ends of two flat wires, and the two flat wires corresponding to each welding end are arranged in two different winding grooves respectively; the multiple welding ends are divided into multiple rows of welding ends in the radial direction of the flat wire motor, the multiple welding ends in each row of welding ends are arranged at intervals in the radial direction of the flat wire motor, and the multiple rows of welding ends are sequentially arranged at intervals in the circumferential direction of the flat wire motor; the multiple rows of welding ends are divided into multiple sets of welding ends in the circumferential direction of the flat wire motor, the multiple rows of welding ends in each set of welding ends are sequentially and adjacently arranged in the circumferential direction of the flat wire motor, and the multiple flat wires corresponding to each set of welding ends are used for transmitting the same-phase alternating current. The two groups of adjacent welding ends along the circumferential direction of the flat wire motor are respectively used for transmitting alternating currents of different phases, so that the voltage difference of the welding ends of different phases can be reduced.

Description

Technical Field

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

[0002] With the development of electric vehicles, high voltage is the main direction of current drive motor technology development, and it also puts forward higher requirements on motor insulation system and reliability. Flat wire motors are widely used in electric vehicles due to their high power density and high torque density.

[0003] In the stator of a traditional flat wire motor, multiple flat wire hairpins are inserted into the stator core and then welded at the axial end of the stator core through expansion, twisting, etc. to form a stator winding. Taking the radial direction of the flat wire motor as a reference, when each winding slot of the stator core contains conductors of different phases, these conductors will be twisted at the same 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 realization of the flat wire motor. Summary of the invention

[0004] The present application provides a flat wire motor, a powertrain and a vehicle. The multiple welding points at the axial end of the flat wire motor are arranged in the same phase and radially adjacent to each other, which can reduce the voltage difference between the welding points of the flat wire motor and is beneficial to the function realization of the flat wire motor.

[0005] In a first aspect, the present application provides a flat wire motor, which can be applied to an electric powertrain. The flat wire motor includes a motor rotor and a motor stator, the motor stator includes a stator core and a stator winding, the stator winding includes a plurality of flat wires, the stator core includes a plurality of winding slots, each winding slot is used to accommodate a plurality of flat wires, the plurality of flat wires in the same winding slot are arranged in sequence along the radial direction of the flat wire motor, one end of each flat wire accommodated in the plurality of winding slots is exposed on the same side of the stator core, wherein: the stator winding includes a plurality of welding ends, each welding end is formed by welding one end of two flat wires, and the two flat wires corresponding to each welding end are arranged at two different Winding slots; multiple welding ends are divided into multiple rows of welding ends along the radial direction of the flat wire motor, multiple welding ends in each row of welding ends are arranged at intervals along the radial direction of the flat wire motor, and multiple rows of welding ends are arranged in sequence at intervals along the circumferential direction of the flat wire motor; multiple rows of welding ends are divided into multiple groups of welding ends along the circumferential direction of the flat wire motor, multiple rows of welding ends in each group of welding ends are arranged adjacent to each other in sequence along the circumferential direction of the flat wire motor, multiple flat wires corresponding to each group of welding ends are used to transmit the same phase of alternating current, and two groups of welding ends adjacent to each other along the circumferential direction of the flat wire motor are respectively used to transmit alternating currents of different phases.

[0006] In the flat wire motor provided by the present application, the radially adjacent welding ends of the flat wire motor all belong to the same phase, and the welding ends of different phases can be arranged in different regions along the circumference of the flat wire motor, increasing the distance between the welding ends of different phases, thereby reducing the voltage difference of the welding ends of different phases and reducing the impact on the performance and safety of the flat wire motor. In the specific implementation, there is no need to change the winding method of the stator winding in the winding slot of the stator core, only the end of the flat wire needs to be designed and arranged, no additional manufacturing process and assembly steps are required, no additional auxiliary structure is required, the volume and weight of the flat wire motor will not be increased, and the cost is low.

[0007] In one embodiment, the number of layers of the two flat wires corresponding to each welding terminal in two different winding slots differs by 1. The two flat wires corresponding to each welding terminal can achieve cross-layer connection.

[0008] In one embodiment, the stator winding of the flat wire motor is wound in a short-pitch form, and in two radially adjacent welding ends of the flat wire motor, the two flat wires corresponding to one welding end and the two flat wires corresponding to the other welding end are respectively offset by one winding slot along the circumferential direction of the flat wire motor.

[0009] In one embodiment, in two rows of welding ends adjacent to each other in the circumferential direction of the flat wire motor, one welding end in one row and one welding end in the other row are arranged adjacent to each other in the circumferential direction of the flat wire motor. The two rows of welding ends adjacent to each other in the circumferential direction may occupy a similar width in the radial direction of the flat wire motor, so as to reduce the end size of the stator winding.

[0010] In one embodiment, two flat wires corresponding to one welding end and two flat wires corresponding to another welding end adjacent to the flat wire motor in the circumferential direction are respectively offset by one winding slot in the circumferential direction of the flat wire motor and arranged in the same layer. The flat wires corresponding to the two welding ends are equivalent to being adjacently arranged in the circumferential direction of the flat wire motor, which is conducive to reducing the end size of the stator winding.

[0011] In one embodiment, along the circumference of the flat wire motor, the distance between two adjacent rows of welding terminals in the same group is smaller than the distance between two adjacent rows of welding terminals in different groups. Different groups of welding terminals are used to transmit alternating current of different phases, and the distance between welding terminals of different phases can be increased to reduce the voltage difference.

[0012] In one embodiment, the flat wire motor is a three-phase motor, and any three groups of welding ends adjacent to each other along the circumference of the flat wire motor are respectively used to transmit three-phase alternating current. The stator winding of the flat wire motor includes a three-phase winding, which is alternately wound on the stator core along the circumference of the flat wire motor.

[0013] In one embodiment, the stator winding includes multiple lead wires for connecting phase electricity, each lead wire and multiple welding ends are located on the same side of the stator core, and at least a portion of each lead wire is arranged adjacent to a row of welding ends of the same phase along the radial direction of the flat wire motor, which is beneficial to reducing the voltage difference.

[0014] In one embodiment, the stator winding of the flat wire motor is wound in a short-pitch form, and in each row of welding ends, the distance between each welding end and the winding slot where a corresponding flat wire is located along the circumference of the flat wire motor is not equal, and the distance between each welding end and the winding slot where another corresponding flat wire is located along the circumference of the flat wire motor is not equal.

[0015] In one embodiment, in each row of welding ends, the distance between a welding end close to the center of the stator core and a corresponding winding slot of a flat wire along the circumferential direction of the flat wire motor is smaller than the distance between a welding end far from the center of the stator core and a corresponding winding slot of a flat wire along the circumferential direction of the flat wire motor, and the distance between a welding end close to the center of the stator core and a corresponding winding slot of another flat wire along the circumferential direction of the flat wire motor is larger than the distance between a welding end far from the center of the stator core and a corresponding winding slot of another flat wire along the circumferential direction of the flat wire motor.

[0016] In one embodiment, the plurality of flat wires corresponding to each row of welding terminals meet the following conditions:

[0017]

[0018] Among them, y2k-1 is the number of slots between the winding slot where the flat wire located in the 2k-1th layer is located and the corresponding welding terminal, y2k is the number of slots between the winding slot where the flat wire located in the 2kth layer is located and the corresponding welding terminal, S2k-1 is the slot number of the winding slot where the flat wire located in the 2k-1th layer is located, S2k is the slot number of the winding slot where the flat wire located in the 2kth layer is located, S0 is the average value of the sum of the slot numbers of the winding slots where multiple flat wires located in odd-numbered layers, S0' is the average value of the sum of the slot numbers of the winding slots where multiple flat wires located in even-numbered layers, y is the pitch of the stator winding, and k is an integer greater than or equal to 1. The extension directions of the two flat wires corresponding to each welding terminal along the circumferential direction of the flat wire motor are opposite.

[0019] In one embodiment, multiple flat wires of the same phase are arranged between two groups of welding ends that are adjacent and in phase along the circumference of the flat wire motor, and the multiple flat wires corresponding to one group of welding ends and the multiple flat wires of the same layer corresponding to the other group of welding ends are arranged adjacent to each other along the radial direction of the flat wire motor.

[0020] In a second aspect, the present application provides a powertrain, including a controller, a reducer, and any one of the motors provided in the second aspect, wherein 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. The reducer can be replaced by a transmission.

[0021] In a third aspect, the present application provides a vehicle, comprising wheels, a transmission mechanism, and a powertrain as provided in the second aspect above, wherein the powertrain drives the wheels to rotate through the transmission mechanism.

[0022] For the technical effects that can be achieved in the above-mentioned second and third aspects, please refer to the description of the technical effects that can be achieved by the corresponding design scheme in the above-mentioned first aspect, and this application will not repeat them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0024] Figure 2 A schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0025] Figure 3a A schematic structural diagram of a stator of a flat wire motor provided in an embodiment of the present application;

[0026] Figure 3b for Figure 3a A magnified view of the details at R1 in the middle;

[0027] Figure 4a A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0028] Figure 4b A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0029] Figure 5a A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0030] Figure 5b A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0031] Figure 6a A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0032] Figure 6b A schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0033] Figure 7aA schematic diagram of a partial structure of a stator of a flat wire motor provided in an embodiment of the present application;

[0034] Figure 7b A schematic diagram of a phase belt of a flat wire motor provided in an embodiment of the present application;

[0035] Figure 8a A schematic diagram of the structure of a U-phase winding of a flat wire motor provided in an embodiment of the present application;

[0036] Figure 8b for Figure 8a A magnified view of the details at R2 in the middle;

[0037] Figure 8c for Figure 8a A magnified view of the details at R3 in the middle;

[0038] Fig. 9 A schematic diagram of the structure of a conductor of a U-phase winding of a flat wire motor provided in an embodiment of the present application;

[0039] Fig.10 A schematic diagram of a phase belt of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0040] Fig.11a A schematic diagram of a phase belt portion of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0041] Fig.11b A schematic diagram of a phase belt portion of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0042] Fig.11c A schematic diagram of a phase belt portion of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0043] Fig.11d A schematic diagram of a phase belt portion of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0044] Fig.11e A schematic diagram of a phase belt portion of a U-phase of a flat wire motor provided in an embodiment of the present application;

[0045] Fig.12 A schematic diagram of a stator winding connection method for a flat wire motor provided in an embodiment of the present application.

[0046] Reference numerals:

[0047] 1000-steering mechanism; 2000-transmission structure; 3000-wheel;

[0048] 100- flat wire motor; 200- reducer;

[0049] 10-motor stator; 20-motor rotor; 30-motor shaft; 40-housing;

[0050] 1- stator core; 11- center hole; 12, 12a, 12b- winding slots; 2- stator winding; 21, 21m, 21m', 21m", 21n, 21n', 21n"- flat wire; 211, 211a, 211b- straight line segment; 212, 212a, 212b- broken line segment; 213- connecting segment; 214- cross-line segment; 3- insulating paper. DETAILED DESCRIPTION

[0051] Flat wire motors are widely used in electric vehicles due to their advantages of high copper full rate, heat dissipation of motor windings, improved voltage resistance of windings, and reduced length of winding ends. The stator winding of current flat wire motors adopts a short-pitch design, and each winding slot of the stator core accommodates winding conductors of different phases.

[0052] When the conductors in different layers in the same winding slot have the same twist angle, the arrangement 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 to each other along the radial direction of the stator core. The voltage difference between 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. At present, increasing the distance between adjacent welding points will increase the volume of the flat wire motor, and coating the welding points will increase the cost.

[0053] Based on this, the embodiments of the present application provide a flat wire motor, a powertrain and a vehicle, wherein the stator winding ends of the flat wire unit are radially arranged as welding points of the same phase, which can reduce the voltage difference between the welding points.

[0054] In order to make the objectives, technical solutions and advantages of the present application more clear, the present application is further described in detail below in conjunction with the accompanying drawings.

[0055] For ease of understanding, the relevant terms are explained below.

[0056] Stator: refers to the stationary part of the motor, whose function is to generate a rotating magnetic field.

[0057] Rotor: refers to the rotating part in the motor, which is used to realize the conversion of electrical energy into mechanical energy.

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

[0060] Phase belt: The number of winding slots continuously occupied by the same phase winding under each pole is the phase belt.

[0061] by Figure 1 Taking the vehicle provided in the embodiment of the present application as an example, the vehicle is an electric vehicle or a hybrid vehicle. The vehicle includes a steering system for changing or maintaining the vehicle's driving direction or reverse direction. Figure 1 As shown, the vehicle includes a wheel 3000, a transmission structure 2000 and a steering mechanism 1000. The steering mechanism 1000 is equivalent to a powertrain for outputting power. The steering mechanism 1000 is connected to the wheel 3000 for steering through the transmission structure 2000, and the wheel 3000 is equivalent to a movable part. The steering mechanism 1000 is a powertrain, including a flat wire motor 100 and a reducer 200. The motor 100 is a flat wire motor. The motor shaft of the flat wire motor 100 is rotatably connected to the input shaft of the reducer 200, and the output shaft of the reducer 200 is used to drive the above-mentioned transmission structure 2000. Among them, the reducer 200 can also be a transmission. The powertrain also includes a controller, which is electrically connected to the motor 100 and is used to adjust the working state of the motor 100.

[0062] like Figure 2 As shown, 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 transmission-connected to the 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 around the stator core 1. When the stator winding 2 is energized, a magnetic field can be formed in the center hole of the stator core 1, and the motor rotor 20 can rotate around the axis of the motor shaft 30 in the magnetic field.

[0063] Figure 3a The structure of the motor stator 10 is shown. Figure 3a As shown, the motor stator 10 includes a stator core 1 and a 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.

[0064] like Figure 3a As shown, the stator core 1 includes a central hole 11 and a plurality of winding slots 12, the central hole 11 passes through the stator core 1 along the axial direction of the flat wire motor 100, and the plurality of winding slots 12 are arranged at intervals along the circumferential direction of the flat wire motor 100. In one embodiment, the plurality of winding slots 12 are connected to the central hole 11 along the radial direction of the flat wire motor 100 respectively.

[0065] like Figure 3aAs shown, 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 on the axial end face M of the stator core 1.

[0066] In one embodiment, one end of each flat wire 21 is exposed from one of the axial end faces M of the stator core 1 . For ease of description, the axial end face M is considered to be the first end face M1 . An insulating paper 3 is provided between the inner wall of each winding slot 12 and the flat wire 21 .

[0067] Figure 3a Part of the stator winding 2 is shown in the figure. The part of the stator winding 2 protruding from the axial end surface M of the stator core 1 along the axial direction of the flat wire motor 100 is called the end winding. In the embodiment of the present application, the stator winding 2 also includes a plurality of lead wires Q for connecting phase electricity. The lead wires Q are used to connect phase electricity or converge. In one embodiment, the lead wires Q are exposed at the first end surface M1 of the stator core 1. Figure 3a As shown, the lead wire Q and the plurality of welding terminals T are located on the same side of the stator core 1 .

[0068] 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.

[0069] Figure 3b Shows Figure 3a Part of the structure of the motor stator 10 at R1. Figure 3b As shown, the stator winding 2 includes a plurality of welding ends T, each welding end T is formed by welding one end of two flat wires 21 exposed at the first end surface M1, and the end of each flat wire 21 exposed at the first end surface M1 is called a welding end t, and a welding end T is shown by a circular dotted line. The two flat wires 21 corresponding to each welding end T are respectively arranged in two different winding slots 12. The plurality of welding ends T are divided into a plurality of rows of welding ends T along the radial direction of the flat wire motor 100, and a row of welding ends T is shown by a square-shaped dotted line. The plurality of welding ends T in each row of welding ends T are arranged at intervals along the radial direction of the flat wire motor 100. The plurality of rows of welding ends T are arranged at intervals in sequence along the circumferential direction of the flat wire motor 100, and two rows of welding ends T arranged at intervals along the circumferential direction of the flat wire motor 100 are shown by two square-shaped dotted lines. The multiple flat wires 21 corresponding to each row of welding terminals T are used to transmit the same phase of alternating current, so the radially adjacent welding terminals T of the flat wire motor 100 are in the same phase, which can reduce the voltage difference between the radially adjacent welding terminals T.

[0070] like Figure 3b As shown, a row of welding ends T includes three welding ends T spaced apart along the radial direction of the flat wire motor 100 , each welding end T is formed by welding the welding ends t of two flat wires 21 along the radial direction of the flat wire motor 100 , and a row of welding ends T includes the welding ends t of 6 flat wires 21 .

[0071] like Figure 3b As shown, 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 circumference of the stator core 1 is located is defined as the first layer S1. Along the radial direction of the flat wire motor 100, from the outer circumference of the stator core 1 to the center, 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. The welding end t located in the first layer S1 is welded to the welding end t located in the second layer S2, the welding end t located in the third layer S3 is welded to the welding end t located in the fourth layer S4, and the welding end t located in the fifth layer S5 is welded to the welding end t located in the sixth layer S6. In one embodiment, the shape of the welding end t of each flat wire 21 is as follows: Figure 3b shown.

[0072] like Figure 3b As shown, the multiple rows of welding ends T of the stator winding 2 are divided into multiple groups of welding ends T along the circumference of the flat wire motor 100, and two groups of welding ends T adjacent to each other along the circumference of the flat wire motor 100 are divided by a break line, and a group of welding ends T is formed between two adjacent break lines along the circumference of the flat wire motor 100. The multiple rows of welding ends T in each group of welding ends T are sequentially arranged adjacent to each other along the circumference of the flat wire motor 100, and the multiple flat wires 21 corresponding to each group of welding ends T are used to transmit the same phase of alternating current, and the two groups of welding ends T adjacent to each other along the circumference of the flat wire motor 100 are respectively used to transmit alternating currents of different phases.

[0073] like Figure 3b As shown, each interrupted wire has two groups of welding terminals T on both sides of the circumference of the flat wire motor 100. The two groups of welding terminals T are respectively used to transmit AC currents of different phases. The welding terminals T of different phases are arranged in different areas along the circumference of the flat wire motor 100, so as to reduce the voltage difference between the circumferentially adjacent welding terminals T.

[0074] Figure 4aThe diagram shows a partial structure of a flat wire 21 and a stator core 1. The flat wire 21 is accommodated in a winding slot 12 of the stator core 1, and one end of the flat wire 21 extends out of the first end face M1 of the stator core 1. The end of the flat wire 21 exposed from the first end face M1 is a welding end t. For ease of understanding, the flat wire 21 includes a straight segment 211 and a broken line segment 212 exposed from the first end face M1. The straight segment 211 is parallel to the axial direction of the flat wire motor 100 and accommodated in the winding slot 12, and the broken line segment 212 extends out of the winding slot 12. The broken line segment 212 is bent relative to the straight segment 211 to extend along the circumferential direction of the flat wire motor 100 and welded to another flat wire 21 to form a welding end T.

[0075] Figure 4b The structure of welding the two flat wires 21 at one end exposed from the first end surface M1 of the stator core 1 to form a welding end T is shown. Figure 4b As shown, the straight line segment 211a of one flat wire 21 is accommodated in the winding slot 12a, and the folded line segment 212a is exposed at the first end surface M1 and extends in a folded direction along the circumference of the flat wire motor 100. The straight line segment 211b of another flat wire 21 is accommodated in the winding slot 12b, and the folded line segment 212b is exposed at the first end surface M1 and extends in a folded direction along the circumference of the flat wire motor 100. The welding end t1 of the folded line segment 212a and the welding end t2 of the folded line segment 212b are welded in the radial direction of the flat wire motor 100 to form a welding end T. The extending direction of the folded line segment 212a along the circumference of the flat wire motor 100 is opposite to the extending direction of the folded line segment 212a along the circumference of the flat wire motor 100, so that the welding ends t of the two folded line segments 212 can be welded to form a welding end T. Among them, the two flat wires 21 corresponding to each welding end T are arranged in two different winding slots 12 respectively, that is, the straight line segment 211a is located in the winding slot 12a, and the straight line segment 211b is located in the winding slot 12b, and the number of layers of the straight line segment 211a in the winding slot 12a is different from the number of layers of the straight line segment 211b in the winding slot 12b.

[0076] In one embodiment, the flat wire motor 100 includes a motor stator 10 with 54 slots, 6 layers and 6 poles. The pitch y of the stator winding 2 is 9, and the angle occupied by the winding slots 12 corresponding to the pitch y along the circumferential direction of the flat wire motor 100 is about 60°. There are 8 winding slots 12 between the winding slots 12 where the two flat wires 21 corresponding to the welding terminal T are located and the winding slot 12b where the straight line segment 211b is located, and the sum of the number of winding slots 12 that the broken line segment 212a and the broken line segment 212b extend along the circumferential direction of the flat wire motor 100 is about 9, and the slot numbers of the two winding slots 12 differ by 9.

[0077] The flat wire motor 100 provided in the embodiment of the present application includes a plurality of welding terminals T located at the first end surface M1 of the stator core 1, and the flat wires 21 corresponding to the welding terminals T adjacent in the radial direction of the flat wire motor 100 are used to transmit the same phase current. In one embodiment, the flat wire 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 and the flat wires 21 corresponding to the welding points adjacent in the radial direction of the flat wire motor 100 are used to transmit the same phase current, thereby reducing the voltage difference between welding points of different phases.

[0078] In the flat wire motor 100 provided in the embodiment of the present application, the welding ends t of the multiple flat wires 21 of the flat wire motor 100 are arranged and welded according to a set rule, and the welding ends T arranged along the radial direction of the flat wire motor 100 belong to the same phase, so there is no need to adjust the arrangement of the flat wires 21 in the winding slots 12 of the stator core 1. The welding ends t of the flat wires 21 exposed on the first end surface M1 of the stator core 1 can be pulled and twisted for welding according to the arrangement scheme of the final welding ends T.

[0079] In one embodiment, the flat wire 21 of the motor stator 10 includes a straight line segment 211, a broken line segment 212, and a connecting segment 213. Figure 5a As shown, the broken line segment 212 and the connecting segment 213 are respectively connected to two ends of the straight line segment 211 .

[0080] like Figure 5a As shown, the straight section 211 of the flat wire 21 is accommodated in a winding slot 12 of the stator core 1, and the broken line section 212 is exposed at one of the axial end faces M of the stator core 1, namely, the first end face M1. The connecting section 213 of the flat wire 21 is exposed at the other axial end face M of the stator core 1, namely, the second end face M2. The welding end t of the broken line section 212 is used to be welded with the welding end t of another flat wire 21 to form a welding end T. At the second end face M2 of the stator core 1, the end q of the connecting section 213 can also be used to connect the end of another flat wire 21. As a structural variation, as Figure 5b A similar Figure 5a The welding end t of the conductor shown is linear and parallel to the axial direction of the flat wire motor 100. The end q of the connecting section 213 is linear.

[0081] In one embodiment, the flat wire 21 of the motor stator 10 includes two straight line segments 211, two broken line segments 212, and a cross-line segment 214. Figure 6a As shown, two straight line segments 211 connect the two ends of the span segment 214 , and each straight line segment 211 connects the span segment 214 and a broken line segment 212 .

[0082] like Figure 6aAs shown, two straight segments 211 of the flat wire 21 are enclosed and accommodated in two different winding slots 12 of the stator core 1, and each folded line segment 212 is exposed at the same axial end face M of the stator core 1, namely, the first end face M1. The cross-line segment 214 of the flat wire 21 is exposed at the other axial end face M of the stator core 1, namely, the second end face M2, and the cross-line segment 214 connects one end of the two straight segments 211 close to the second end face M2. The welding end t of each folded line segment 212 is used to weld with the welding end t of another flat wire 21 to form a welding end T. As a structural deformation, as Figure 5b A similar Figure 5a The welding end t of the conductor shown is straight and parallel to the axial direction of the flat wire motor 100 .

[0083] Figure 7a This is a partial structural diagram of a stator of a flat wire motor provided in an embodiment of the present application. Figure 7a The partial structure of the motor stator 10 is shown. A plurality of flat wires 21 are placed in each winding slot 12 of the stator core 1 . The plurality of flat wires 21 are arranged in sequence along the radial direction of the flat wire motor 100 .

[0084] In one embodiment, six flat wires are arranged in each winding slot 12 along the radial direction of the flat wire motor 100. The layer of the flat wire 21 close to the outer circumference of the stator core 1 is defined as the first layer L1. In the radial direction of the flat wire motor 100, from the outer circumference of the stator core 1 to the center, 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 S6. In one embodiment, the number of layers of the flat wire 21 in each winding slot 12 is as follows: Figure 7a shown.

[0085] In one embodiment, the plurality of flat wires 21 included in the stator winding 2 can be connected in groups to form an m-phase winding, where m can be 2, 3, 4, 5, or 6, etc., that is, the number of phases of the corresponding flat wire motor can be two-phase, three-phase, four-phase, five-phase, six-phase or more phases. Taking the 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, which correspond to the U phase winding, the V phase winding, and the 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 a periodic arrangement in sequence along the inner wall of the stator core. Among them, each phase unit of each phase winding is a pole phase, and the number of slots of the winding slot 12 corresponding to each phase unit is the number of slots per pole per phase.

[0086] The flat wire motor 100 provided in the embodiment of the present application is a short-pitch winding motor, and the multiple flat wires 21 arranged in certain winding slots 12 of the stator core 1 belong to different phases. Taking a motor stator 10 with 54 slots, 6 layers and 6 poles as an example, Figure 7bThe phase belt distribution of the stator winding 2 of the motor stator 10 is shown.

[0087] like Figure 7b As shown, the stator winding 2 includes a U-phase winding, a V-phase winding and a W-phase winding, and the U-phase winding, the V-phase winding and the W-phase winding are shown in different shades, and each square represents a portion of a flat wire 21 located in a winding slot 12, and the number is the slot number of the winding slot 12. The dotted box illustrates a phase unit D of the U-phase winding, and the phase band 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 bands d, and any two phase bands d adjacent to each other in the radial direction of the flat wire motor 100 are offset by one winding slot 12 along the circumferential direction of the flat wire motor 100.

[0088] In one embodiment, each phase unit D includes three phase belts d, and each phase belt d includes two layers of flat wires 21. Each layer of flat wires 21 includes three flat wires 21 arranged adjacent to each other along the circumference of the flat wire motor 100. Figure 5b As shown, each phase winding includes 6 layers of flat wires 21 , and the layers of the 6 layers of flat wires 21 in the winding slots 12 are respectively a first layer L1 , a second layer L2 , a third layer L3 , a fourth layer L4 , a fifth layer L5 , and a sixth layer S6 .

[0089] In one embodiment, each phase belt unit D includes three phase belts d. Along the circumference of the flat wire motor 100 , the flat wire 21 corresponding to one phase unit D occupies five winding slots 12 .

[0090] Please continue to refer to Figure 7b Each winding slot 12 of the stator core 1 contains six flat wires 21. In some winding slots 12, the six flat wires 21 are all one phase, and in other winding slots 12, the six flat wires 21 are divided into two phases.

[0091] In one embodiment, the six flat wires 21 in the 17th winding slot 12 are all U-phase, the six flat wires 21 in the 15th winding slot 12 include two U-phases and four V-phases, and the six flat wires 21 in the 16th winding slot 12 include two V-phases and four U-phases. For a phase unit D of the same phase, the 18 flat wires 21 are distributed in five winding slots 12 arranged in sequence along the circumferential direction of the flat wire motor 100, and are distributed in six layers along the radial direction of the flat wire motor 100.

[0092] Figure 8a That is, it shows the structure of a phase winding of the flat wire motor 100, wherein the phase winding includes a plurality of Figure 6b The flat wire 21 shown in the figure, the plurality of flat wires 21 are Figure 7b The one-phase winding is wound according to the rule shown. Figure 8aAs shown, one phase winding includes multiple groups of welding ends T, and the positions indicated by R2 and R3 are two groups of welding ends T. The multiple groups of welding ends T of the phase winding are arranged at intervals along the circumference of the flat wire motor 100. Each welding end T is formed by welding the welding ends t of two flat wires 21 along the radial direction of the flat wire motor 100, and each welding end t is the end of the broken line segment 212 of the flat wire 21. It should be understood that the three-phase winding of the flat wire motor 100, the U-phase winding, the V-phase winding and the W-phase winding are all Figure 8a The structure shown.

[0093] Please continue to refer to Figure 8a In the dashed box shown, the straight segments 211 of the plurality of flat wires 21 between two adjacent groups of welding ends T along the circumference of the flat wire motor 100 are arranged in five groups, each group of straight segments 211 is located in the same winding slot 12, and the number of straight segments 211 in each group is not necessarily the same. It should be understood that the distribution state of the straight segments 211 of the plurality of flat wires 21 of each phase winding in the winding slot 12 is Figure 7b The arrangement of the straight segments 211 of the plurality of flat wires 21 between two adjacent groups of welding ends T along the circumferential direction of the flat wire motor 100 can be referred to Figure 7b The distribution state of the flat wire 21 included in one phase band.

[0094] Figure 8b Shows Figure 8a The details of R2 are enlarged. Figure 8b As shown, each group of welding terminals T includes three rows of welding terminals T, and the dotted line frame indicates a row of welding terminals T. The row of welding terminals T includes three welding terminals T arranged at intervals along the radial direction of the flat wire motor 100, and each welding terminal T is formed by welding the welding ends t of two flat wires 21 along the radial direction of the flat wire motor 100. A group of welding terminals T includes three rows of welding terminals T shown in the dotted line frame.

[0095] Figure 8c Shows Figure 8b The details of R3 are enlarged. Figure 8c As shown, each lead wire Q includes at least a section parallel to the axial direction of the flat wire motor 100. The section of the lead wire Q is arranged adjacent to a row of in-phase welding terminals T along the radial direction of the flat wire motor 100, which can reduce the voltage difference between the lead wire Q and the welding terminals T. Along the axial direction of the flat wire motor 100, the height of the lead wire Q is higher than the height of the welding terminal t of each flat wire 21, which facilitates the routing and convergence of the lead wire Q. In one embodiment, the shape of the lead wire Q is as follows: Figure 8c shown.

[0096] In the flat wire motor 100 provided in the embodiment of the present application, each phase winding includes two windings such as Fig. 9As shown in the wires, two wires can be connected in parallel or in series to form a phase winding. Each wire includes a plurality of flat wires 21 connected end to end, and the ends of the two flat wires 21 at both ends of the wire form a lead wire Q. Fig. 9 The two wires shown are rotated 30° along the circumference of the flat wire motor 100 to form a phase winding. Fig. 9 As shown, the two lead wires Q of each conductor are located in the same group of welding terminals T, the two lead wires Q are arranged at intervals along the radial direction of the flat wire motor 100, and two welding terminals T are arranged between the two lead wires Q.

[0097] Please continue to refer to Fig. 9 , half of the multiple flat wires 21 corresponding to each group of welding terminals T extend to the left along the circumference of the flat wire motor 100, and half extend to the right along the circumference of the flat wire motor 100. The straight segments 211 of the multiple flat wires 21 on each side are distributed in the five winding slots 12, and the straight segments 211 of the flat wires 21 in the same winding slot 12 are represented by a dotted frame. Specifically, the middle group of straight segments 211 is indicated by a dotted frame c1, the two groups of straight segments 211 on the side are indicated by dotted frames c3, and the two groups of straight segments 211 on both sides of the middle straight segment 211 are indicated by dotted frames c2. The dotted frame c1 shows three straight segments 211 of the flat wires 21, the dotted frame c2 shows two straight segments 211 of the flat wires 21, and the dotted frame c3 shows one straight segment 211 of the flat wire 21. When the two conductors included in a single-phase winding cooperate to form a single-phase winding, a group of straight line segments 211 shown in a dotted box c1 of one conductor and a group of straight line segments 211 shown in a dotted box c1 of another conductor are distributed in a winding slot 12, a group of straight line segments 211 shown in a dotted box c2 of one conductor and a group of straight line segments 211 shown in a dotted box c2 of another conductor are distributed in a winding slot 12, and a group of straight line segments 211 shown in a dotted box c3 of one conductor and a group of straight line segments 211 shown in a dotted box c3 of another conductor are distributed in a winding slot 12.

[0098] Based on the phase band distribution of the stator winding 2 of the flat wire motor 100 and the structure of the flat wire 21, a motor stator 10 with 54 slots, 6 layers and 6 poles of a short-pitch winding is taken as an example. Fig.10 This is a schematic diagram of the distribution of a portion of the phase band d of the U-phase winding in a flat wire motor 100 provided in an embodiment of the present application. Fig.10 As shown, a black dot indicates a welding terminal T, and each welding terminal T is formed by welding the ends of two U-phase flat wires 21. The welding terminals T of the U-phase winding are distributed into multiple groups along the circumference of the flat wire motor 100, and each group of welding terminals T is indicated by a dotted frame. Each group of welding terminals T of the U-phase winding includes multiple rows of welding terminals T arranged adjacent to each other in sequence along the circumference of the flat wire motor 100, and each row of welding terminals T includes three welding terminals T arranged at intervals along the radial direction of the flat wire motor 100.

[0099] Combination Fig.10 and Fig.11a , a dotted line and a solid line connected to each welding terminal T are two flat wires 21 respectively, and the number of layers of the two flat wires 21 corresponding to each welding terminal T arranged in two different winding slots 12 differs by 1. Fig.11a As shown, two flat wires 21 corresponding to a welding terminal T, one flat wire 21 is located in a winding slot 12 with slot number 6, and the other flat wire 21 is located in a winding slot 12 with slot number 15, and the difference between the two winding slots 12 is 9. The number of layers of one flat wire 21 in the winding slot 12 with number 6 is the first layer L1, and the number of layers of the other flat wire 21 in the winding slot 12 with number 15 is the second layer L2, which can realize the cross-layer of the U-phase winding along the radial direction of the flat wire motor 100.

[0100] Please continue to refer to Fig.11a The two flat wires 21 corresponding to one welding terminal T and the two flat wires 21 corresponding to another welding terminal T adjacent in the circumferential direction of the flat wire motor 100 are respectively arranged in the same layer with a staggered position of one winding slot 12 in the circumferential direction of the flat wire motor 100. For a group of welding terminals T, the flat wires 21 corresponding to the plurality of welding terminals T adjacent in the circumferential direction of the flat wire motor 100 in the group of welding terminals T are sequentially adjacent in the circumferential direction of the flat wire motor 100, which is beneficial to reducing the end size of the stator winding. Fig.11a The illustrated set of welding terminals T includes three welding terminals T that are adjacently arranged along the circumferential direction of the flat wire motor 100 .

[0101] Combination Fig.10 and Fig.11b In the same phase unit, the flat wires 21 of two phase bands d adjacent in the radial direction of the flat wire motor 100 are offset by one winding slot 12 in the circumferential direction of the flat wire motor 100, and a phase band d is indicated by a dotted frame. Of two welding terminals T adjacent in the radial direction of the flat wire motor 100, the two flat wires 21 corresponding to one welding terminal T and the two flat wires 21 corresponding to the other welding terminal T are offset by one winding slot 12 in the circumferential direction of the flat wire motor 100.

[0102] In one embodiment, the two flat wires 21 corresponding to one welding terminal T1 are respectively the flat wire 21m and the flat wire 21n, and the two flat wires 21 corresponding to the other welding terminal T2 are respectively the flat wire 21m' and the flat wire 21n. Along the circumferential direction of the flat wire motor 100, the flat wire 21m and the flat wire 21m' are offset by one winding slot 12, and the flat wire 21n and the flat wire 21n' are offset by one winding slot 12. Along the radial direction of the flat wire motor 100, the number of layers of the flat wire 21m in the winding slot 12 differs by 2 from the number of layers of the flat wire 21m' in the winding slot 12, and the number of layers of the flat wire 21n in the winding slot 12 differs by 2 from the number of layers of the flat wire 21n' in the winding slot 12.

[0103] 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 winding slot 12 where a corresponding flat wire 21 is located is not equal, and the distance between each welding end T and the winding slot 12 where another flat wire 21 is located is not equal. Taking two welding ends T arranged at intervals 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 winding slot 12 where the corresponding flat wire 21 is located 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 winding slot 12 where the corresponding flat wire 21 is located along the circumferential direction of the flat wire motor 100. The distance between the welding end T close to the center of the stator core 1 and the winding slot 12 where the corresponding other flat wire 21 is located 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 winding slot 12 where the corresponding other flat wire 21 is located along the circumferential direction of the flat wire motor 100. Fig.11b In the embodiment, the welding end T1 and the welding end T2 are taken as examples. The welding end T1 is the welding end T far from the center of the stator core 1 , and the welding end T2 is the welding end T close to the center of the stator core 1 .

[0104] In one embodiment, the distance between the No. 6 winding slot 12 where a flat wire 21m corresponding to the welding terminal T1 is located is about 5.5 slots, the distance between the No. 15 winding slot 12 where another flat wire 21n corresponding to the welding terminal T1 is located is about 3.5 slots, and the distance between the No. 6 winding slot 12 where the flat wire 21m is located and the No. 15 winding slot 12 where the flat wire 21n is located is 9 slots. The distance between the No. 7 winding slot 12 where a flat wire 21m' corresponding to the welding terminal T2 is about 4.5 slots, the distance between the No. 16 winding slot 12 where another flat wire 21n' corresponding to the welding terminal T2 is about 4.5 slots, and the distance between the No. 7 winding slot 12 where the flat wire 21m' is located and the No. 16 winding slot 12 where the flat wire 21n' is located is 9 slots.

[0105] Further references Fig.11cAs shown, for the welding ends T included in a row of welding ends T, the distance between each welding end T and the winding slot 12 where a corresponding flat wire 21 is located along the circumferential direction of the flat wire motor 100 is not equal, and the distance between each welding end T and the winding slot 12 where another corresponding flat wire 21 is located along the circumferential direction of the flat wire motor 100 is not equal. In each row of welding ends T, the distance between the welding end T close to the center of the stator core 1 and the winding slot 12 where a corresponding flat wire 21 is located 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 winding slot 12 where a corresponding flat wire 21 is located 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 winding slot 12 where another flat wire 21 is located 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 winding slot 12 where another flat wire 21 is located along the circumferential direction of the flat wire motor 100.

[0106] In one embodiment, a row of welding terminals T includes welding terminals T1, welding terminals T2, and welding terminals T3 arranged in sequence along the radial direction of the flat wire motor 100. The distance between the No. 6 winding slot 12 where a flat wire 21m corresponding to the welding terminal T1 is about 5.5 slots, the distance between the No. 15 winding slot 12 where another flat wire 21n corresponding to the welding terminal T1 is about 3.5 slots, and the distance between the No. 6 winding slot 12 where the flat wire 21m is located and the No. 15 winding slot 12 where the flat wire 21n is located is 9 slots. The distance between the No. 7 winding slot 12 where a flat wire 21m' corresponding to the welding terminal T2 is about 4.5 slots, the distance between the No. 16 winding slot 12 where another flat wire 21n' corresponding to the welding terminal T2 is about 4.5 slots, and the distance between the No. 7 winding slot 12 where the flat wire 21m' is located and the No. 16 winding slot 12 where the flat wire 21n' is located is 9 slots. The distance between the No. 8 winding slot 12 where a flat wire 21m" corresponding to the welding terminal T3 is about 3.5 slots, the distance between the No. 17 winding slot 12 where another flat wire 21n" corresponding to the welding terminal T3 is about 5.5 slots, and the distance between the No. 8 winding slot 12 where the flat wire 21m" is located and the No. 17 winding slot 12 where the flat wire 21n" is located is 9 slots.

[0107] The flat wire motor 100 provided in the embodiment of the present application performs pulling and twisting welding on the welding end t of the flat wire 21 exposed from the first end surface M1 of the stator core 1 according to certain rules, so that the welding ends T of the same phase can be arranged along the radial direction of the flat wire motor 100 to reduce the voltage difference. It is advisable to pull and twist the flat wire 21 with the minimum distance, which can reduce the material consumption of the flat wire 21 and is also conducive to reducing the end size of the stator winding 2. In the flat wire motor 100 provided in the embodiment of the present application, a group of welding ends T is arranged between two groups of circumferentially adjacent flat wires 21.

[0108] In the flat wire motor 100 provided in the embodiment of the present application, each welding terminal T corresponds to a flat wire 21 located in an odd-numbered layer and a flat wire 21 located in an even-numbered layer. The three welding terminals T included in each row of welding terminals T correspond to a plurality of flat wires 21 located in odd-numbered layers and a plurality of flat wires 21 located in even-numbered layers. In one embodiment, the flat wires 21 in the odd-numbered layers cross over to the left, and the flat wires 21 in the even-numbered layers cross over to the right.

[0109] The plurality of flat wires 21 located in odd-numbered layers corresponding to each row of welding terminals T satisfy the following conditions:

[0110]

[0111] The plurality of flat wires 21 located in even-numbered layers corresponding to each row of welding terminals T meet the following conditions:

[0112]

[0113] Wherein, y2k-1 is the slot distance between the winding slot 12 where the flat wire 21 located in the 2k-1th layer is located and the corresponding welding terminal T, y2k is the slot distance between the winding slot 12 where the flat wire 21 located in the 2kth layer is located and the corresponding welding terminal T, S2k-1 is the slot number of the winding slot 12 where the flat wire 21 located in the 2k-1th layer is located, S2k is the slot number of the winding slot 12 where the flat wire 21 located in the 2kth layer is located, S0 is the average value of the sum of the slot numbers of the winding slots 12 where the multiple flat wires 21 located in the odd-numbered layers, S0' is the average value of the sum of the slot numbers of the winding slots 12 where the multiple flat wires 21 located in the even-numbered layers, y is the pitch of the stator winding 2, and k is an integer greater than or equal to 1. Wherein, 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.

[0114] Combination Fig.11c , a flat wire 21m corresponding to the welding terminal T1 is located at the No. 6 winding slot 12 and the second layer L2. Another flat wire 21n corresponding to the welding terminal T1 is located at the No. 15 winding slot 12 and the first layer L1. A flat wire 21m' corresponding to the welding terminal T2 is located at the No. 7 winding slot 12 and the fourth layer L4. Another flat wire 21n' corresponding to the welding terminal T2 is located at the No. 16 winding slot 12 and the third layer L3. A flat wire 21m" corresponding to the welding terminal T3 is located at the No. 8 winding slot 12 and the sixth layer L6. Another flat wire 21n" corresponding to the welding terminal T2 is located at the No. 17 winding slot 12 and the fifth layer L5.

[0115] The slot numbers of the winding slots 12 where the flat wires 21 of the three odd-numbered layers are located are 15, 16, and 17, respectively, and the average value of the slot numbers of the three winding slots 12 is 16. The slot pitch of the flat wire 21n located in the first layer L1 along the left-direction crossover of the flat wire motor 100 is: 15-16+4.5=3.5. The slot pitch of the flat wire 21n' located in the third layer L3 along the left-direction crossover of the flat wire motor 100 is: 16-16+4.5=4.5. The slot pitch of the flat wire 21n" located in the fifth layer L3 along the left-direction crossover of the flat wire motor 100 is: 17-16+4.5=5.5.

[0116] The slot numbers of the winding slots 12 where the flat wires 21 of the three even-numbered layers are located are 6, 7, and 8, respectively, and the average value of the slot numbers of the three winding slots 12 is 7. The slot pitch of the flat wire 21m located in the second layer L2 along the right-hand crossover of the flat wire motor 100 is: 7-6+4.5=5.5. The slot pitch of the flat wire 21m' located in the fourth layer L4 along the right-hand crossover of the flat wire motor 100 is: 7-7+4.5=4.5. The slot pitch of the flat wire 21m" located in the sixth layer L6 along the right-hand crossover of the flat wire motor 100 is: 7-8+4.5=3.5.

[0117] In one embodiment, among the six flat wires 21 corresponding to the three welding terminals T included in each row of welding terminals T, the flat wires 21 in the odd-numbered layers cross over to the right, while the flat wires 21 in the even-numbered layers cross over to the left. The crossover directions of the two flat wires 21 corresponding to each welding terminal T are opposite.

[0118] Combination Fig.10 and Fig.11d As shown, in two adjacent rows of welding ends T along the circumferential direction of the flat wire motor 100 , one welding end T in one row of welding ends T and one welding end T in the other row of welding ends T are arranged adjacent to each other along the circumferential direction of the flat wire motor 100 .

[0119] like Fig.11d As shown, P1 indicates a row of welding ends T and P2 indicates a row of welding ends T, each row of welding ends T includes three welding ends T arranged at intervals along the radial direction of the flat wire motor 100, and one welding end T in P1 and one welding end T in P2 are arranged adjacent to each other along the circumferential direction of the flat wire motor 100. The two rows of welding ends T occupy a similar radial width at the end of the motor stator 10, and when all the welding ends T occupy a similar radial width at the end of the motor stator 10, it is beneficial to reduce the end size of the stator winding 2, and further to reduce the volume of the motor stator 10.

[0120] Combination Fig.10 and Fig.11eAs shown, a plurality of flat wires 21 of the same phase are arranged between two groups of welding terminals T adjacent to each other in the circumferential direction of the flat wire motor 100, and the plurality of flat wires 21 can be considered as a phase unit D. A plurality of flat wires 21 corresponding to a row of welding terminals T in one group of welding terminals T and a plurality of flat wires 21 corresponding to a row of welding terminals T in another group of welding terminals T and in the same layer are arranged adjacent to each other in the radial direction of the flat wire motor 100, and the plurality of flat wires 21 can be considered as a phase band d.

[0121] The above embodiment is described by taking the U-phase winding as the winding method of the same phase winding, and the V-phase winding and the W-phase winding also conform to the above winding rules. Fig.12 As shown, the welding ends T of the three-phase winding of the flat wire motor 100 are alternately arranged along the circumference of the flat wire motor 100 , and any three groups of welding ends T adjacent to each other along the circumference of the flat wire motor 100 are respectively used to transmit three-phase alternating current.

[0122] Among them, the welding end T of the U-phase winding is indicated by a black solid dot, and the corresponding flat wire 21 is indicated by a straight line. The welding end T of the V-phase winding is indicated by a gray solid dot, and the corresponding flat wire 21 is indicated by a dotted line with a small spacing. The welding end T of the W-phase winding is indicated by a hollow dot, and the corresponding flat wire 21 is indicated by a dotted line with a large spacing. Two groups of welding ends T of the other two phase windings are arranged between two groups of welding ends T of the same phase adjacent to each other along the circumference of the flat wire motor 100. For example, a group of welding ends T of the W phase and a welding end T of the V phase are arranged between two groups of welding ends T of the U direction adjacent to each other along the circumference of the flat wire single-stage 100.

[0123] In one embodiment, along the circumferential direction of the flat wire motor 100, the distance h1 between two adjacent rows of welding terminals T in the same group is configured to be smaller than the distance h2 between two adjacent rows of welding terminals T in different groups. Taking a group of V-phase welding terminals T and a group of U-phase welding terminals T adjacent to each other along the circumferential direction of the flat wire motor 100 as an example, the distance h1 between two adjacent welding terminals T in a group of V-phase welding terminals T can be smaller than the distance h2 between a V-phase welding terminal T and a U-phase welding terminal T adjacent to each other in the circumferential direction, and the two-phase welding terminals T are separated 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.

[0124] In summary, in the flat wire motor 100 provided in the embodiment of the present application, the cross-line distance of the welding ends t of the flat wires 21 of different phases along the circumference of the flat wire motor 100 is adjusted, so that the welding ends T adjacent to each other in the radial direction of the flat wire motor 100 belong to the same phase, and the welding ends T of different phases can be arranged in different regions along the circumference of the flat wire motor 100 according to different phases, thereby increasing the distance between the welding ends T of different phases, thereby reducing the voltage difference of the welding ends T of different phases, and reducing the impact on the performance and safety of the flat wire motor 100. This solution only needs to design and arrange the welding ends t of the flat wire 21, does not require additional manufacturing processes and assembly steps, does not require additional auxiliary structures, does not increase the volume and weight of the flat wire motor 100, has low cost, and has good application prospects. In some embodiments, compared with traditional flat wire motors, the voltage difference between radially adjacent welding ends T of the flat wire motor 100 provided in the embodiment can be reduced by about 40%, and the solder joint coating process can be omitted for the high-voltage flat wire motor 100, thereby saving about RMB 20 in manufacturing costs.

[0125] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A flat wire motor, characterized in that: 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 of the winding slots is used to accommodate 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 of the flat wires accommodated in the plurality of winding slots is exposed on the same side of the stator core, wherein: The stator winding includes a plurality of welding ends, each of which is formed by welding one end of two flat wires, and the two flat wires corresponding to each welding end are respectively arranged in two different winding slots; The plurality of welding ends are divided into a plurality of rows of welding ends along the radial direction of the flat wire motor, a plurality of welding ends in each row are arranged at intervals along the radial direction of the flat wire motor, and the plurality of rows of welding ends are arranged at intervals in sequence along the circumferential direction of the flat wire motor; The multiple rows of welding ends are divided into multiple groups of welding ends along the circumferential direction of the flat wire motor. The multiple rows of welding ends in each group of welding ends are arranged adjacent to each other in sequence along the circumferential direction of the flat wire motor. The multiple flat wires corresponding to each group of welding ends are used to transmit the same phase of alternating current, and the two adjacent groups of welding ends along the circumferential direction of the flat wire motor are respectively used to transmit alternating currents of different phases.

2. The flat wire motor according to claim 1, characterized in that: The number of layers of the two flat wires corresponding to each welding end arranged in two different winding slots differs by 1.

3. The flat wire motor according to claim 1 or 2, characterized in that: Of the two welding ends adjacent to each other in the radial direction of the flat wire motor, the two flat wires corresponding to one welding end and the two flat wires corresponding to the other welding end are respectively offset by one winding slot in the circumferential direction of the flat wire motor.

4. The flat wire motor according to any one of claims 1 to 3, characterized in that: In two adjacent rows of welding ends along the circumferential direction of the flat wire motor, one welding end in one row and one welding end in the other row are arranged adjacent to each other along the circumferential direction of the flat wire motor.

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

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

7. The flat wire motor according to any one of claims 1 to 6, characterized in that: The flat wire motor is a three-phase motor, and any three groups of welding ends that are sequentially adjacent to each other along the circumference of the flat wire motor are respectively used to transmit three-phase alternating current.

8. The flat wire motor according to claim 7, characterized in that: The stator winding includes a plurality of lead wires for connecting phase electricity, each of the lead wires and the plurality of welding ends are located on the same side of the stator core, and at least a portion of each of the lead wires is arranged adjacent to a row of the welding ends of the same phase along the radial direction of the flat wire motor.

9. The flat wire motor according to any one of claims 1 to 8, characterized in that: In each row of the welding ends, the distance between each welding end and the winding slot where a corresponding flat wire is located along the circumference of the flat wire motor is not equal, and the distance between each welding end and the winding slot where another corresponding flat wire is located along the circumference of the flat wire motor is not equal.

10. The flat wire motor according to claim 9, characterized in that: In each row of the welding ends, the distance between the welding end close to the center of the stator core and the winding slot where a corresponding flat wire is located along the circumferential direction of the flat wire motor is smaller than the distance between the welding end far from the center of the stator core and the winding slot where a corresponding flat wire is located 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 winding slot where another corresponding flat wire is located along the circumferential direction of the flat wire motor is larger than the distance between the welding end far from the center of the stator core and the winding slot where another corresponding flat wire is located along the circumferential direction of the flat wire motor.

11. The flat wire motor according to claim 9 or 10, characterized in that: The plurality of flat wires corresponding to each row of the welding terminals meet the following conditions: Among them, y2k-1 is the number of slots between the winding slot where the flat wire located in the 2k-1th layer is located and the corresponding welding end, y2k is the number of slots between the winding slot where the flat wire located in the 2kth layer is located and the corresponding welding end, S2k-1 is the slot number of the winding slot where the flat wire located in the 2k-1th layer is located, S2k is the slot number of the winding slot where the flat wire located in the 2kth layer is located, S0 is the average value of the sum of the slot numbers of the winding slots where the multiple flat wires located in the odd-numbered layers, S0' is the average value of the sum of the slot numbers of the winding slots where the multiple flat wires located in the even-numbered layers, y is the pitch of the stator winding, and k is an integer greater than or equal to 1.

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

13. A powertrain, characterized in that: It comprises a reducer and a flat wire motor as described in any one of claims 1 to 12, wherein the flat wire motor is drivingly connected to the reducer.

14. A vehicle, characterized in that: The invention comprises a wheel, a transmission mechanism and the power assembly as claimed in claim 13, wherein the power assembly drives the wheel through the transmission mechanism.

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