Flat wire motor, power assembly and vehicle

Abstract

This application provides a flat wire motor, powertrain, and vehicle, relating to the field of flat wire motor technology. An opening is provided at the top of the flat wire motor housing, corresponding to the phase terminals of the U-phase, V-phase, and W-phase lead-out buses, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase, V-phase, and W-phase lead-out buses are located on a first layer above the solder joints, and the neutral bus is raised to a second layer, wherein the second layer is the space farther away from the stator core compared to the first layer. Except for the portion corresponding to the opening, the radial width of the neutral bus gradually narrows from the center to both ends, so that the U-phase, V-phase, and W-phase lead-out buses are arranged with the neutral bus in the first layer.

Description

Technical Field

[0001] This application relates to the field of flat wire motor technology, and more particularly to a flat wire motor, powertrain, and vehicle. Background Technology

[0002] Flat-wire motors are a type of motor that uses flat rectangular conductors as stator windings. Compared to traditional motors that use round conductors, flat-wire motors have higher copper fill factor, higher power density, higher efficiency, and better heat dissipation performance, and are widely used in new energy vehicles, industrial equipment, and other fields.

[0003] Currently, flat-wire motors have a large axial dimension, resulting in a significant space requirement in vehicles, which hinders overall vehicle miniaturization and weight reduction. The connection between the neutral busbar and the neutral conductor end is a single-sided joint. Existing flat-wire motors have been modified by removing the rectangular portion at the end of the neutral busbar to create a three-sided joint. To ensure sufficient conductive cross-sectional area, reliable welding is required on all three sides of the three-sided joint. This is significantly more difficult than the single-sided welding of the previous single-sided joint.

[0004] Therefore, there is an urgent need for a flat wire motor with reduced dimensions along the stator axis, which facilitates welding between the neutral bus and the welding end. Utility Model Content

[0005] This application provides a flat wire motor, powertrain, and vehicle to reduce the axial dimension of the flat wire motor and facilitate welding between the neutral bus and the welding end.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] A first aspect of this application provides a flat-wire motor, wherein the motor stator of the flat-wire motor includes a stator core, stator windings, a U-phase lead busbar, a V-phase lead busbar, a W-phase lead busbar, a neutral busbar, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead busbar is used to connect the multiple U-phase leads, the V-phase lead busbar is used to connect the multiple V-phase leads, the W-phase lead busbar is used to connect the multiple W-phase leads, and the neutral busbar is used to connect the multiple neutral leads, wherein:

[0008] An opening is provided on the top of the housing of the flat wire motor, corresponding to the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located on the first layer of the solder joint, and the neutral bus is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer.

[0009] Except for the portion corresponding to the opening, the radial width of the neutral bus gradually narrows from the center to both ends of the neutral bus, so that the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are arranged with the neutral bus in the first layer.

[0010] In the flat wire motor provided in this embodiment, because the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus extend axially upwards towards the stator core, and in the portion of the flat wire motor housing with an opening at the top, along the axial direction of the stator core, the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located one layer above the solder joint, and the neutral bus is raised to a second layer. This reduces the axial dimension of the motor stator and effectively utilizes the radial space of the motor stator, making the motor stator more compact in both the axial and radial directions, which is beneficial for the miniaturization of the flat wire motor. Furthermore, except for the portion of the flat wire motor housing with an opening at the top, the radial width of the neutral bus gradually narrows from the center to both ends of the neutral bus, and both the neutral bus and the neutral bus are lowered to one layer above the solder joint. In the neutral busbar, because the neutral busbar has a current-splitting effect at both ends along the circumference of the motor stator, the current density along the circumference of the motor stator gradually decreases from the middle to both ends of the neutral busbar. This allows the central section of the neutral busbar to withstand a higher current density, reducing unnecessary material consumption and lowering the weight and cost of the neutral busbar, thus contributing to a reduction in the weight and cost of the flat wire motor. Specifically, the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar are all single-sided welded to the welding end, facilitating the welding between the U-phase lead busbar, the V-phase lead busbar, the W-phase lead busbar, and the welding end.

[0011] In one embodiment, along the circumferential direction of the motor stator, the neutral busbar includes a neutral busbar end section and a neutral busbar center section, wherein the radial width W1 of the neutral busbar center section is greater than the radial width W of the neutral busbar end section. n .

[0012] In the flat wire motor provided in this application embodiment, the center section of the neutral busbar is located between the end sections of two neutral busbars, and the dimension of the center section of the neutral busbar along the radial direction of the motor stator is greater than the dimension of at least one end section of the neutral busbar along the radial direction of the motor stator. This allows the center section of the neutral busbar to withstand higher current density, and the dimension of the end section P2 of the neutral busbar along the radial direction of the motor stator is rationally designed. While ensuring the current transmission of the neutral busbar 203, unnecessary material consumption of the neutral busbar 203 is reduced, thereby reducing the weight and cost of the neutral busbar and thus helping to reduce the weight and cost of the flat wire motor.

[0013] In one embodiment, the radial width W of the final section of the neutral busbar n The radial width W1 of the center section of the neutral busbar satisfies the following relationship: W n ≥W1 / n.

[0014] In one embodiment, along the circumferential direction of the motor stator, the neutral busbar further includes a neutral busbar intermediate section, the radial width W of which is... x The radial width W of the last section of the neutral busbar is greater than or equal to that of the neutral busbar. n And less than or equal to the radial width W1 of the center segment of the neutral busbar, where 2n represents the number of neutral points of the stator winding, x∈{1,2,...n}.

[0015] In one embodiment, the radial width W at the middle end of the neutral busbar x The radial width W1 of the center section of the neutral busbar satisfies the following relationship: W x ≥W1×((n-x+1) / n).

[0016] A second aspect of this application provides a flat wire motor, wherein the motor stator of the flat wire motor includes a stator core, stator windings, a U-phase lead busbar, a V-phase lead busbar, a W-phase lead busbar, a neutral busbar, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead busbar is used to connect the multiple U-phase leads, the V-phase lead busbar is used to connect the multiple V-phase leads, the W-phase lead busbar is used to connect the multiple W-phase leads, and the neutral busbar is used to connect the multiple neutral leads, wherein:

[0017] An opening is provided on the top of the housing of the flat wire motor, corresponding to the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located on the first layer of the solder joint, and the neutral bus is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer.

[0018] Except for the portion corresponding to the opening, the axial thickness of the neutral busbar is increased and the radial width is reduced, so that the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar are arranged with the neutral busbar in the first layer.

[0019] In the flat wire motor provided in this application, since the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus extend axially upwards towards the stator core, and the portion of the flat wire motor housing with an opening at the top, along the axial direction of the stator core, the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located one layer above the solder joint, and the neutral bus is raised to the second layer. This reduces the axial dimension of the motor stator and effectively utilizes the radial space of the motor stator, making the motor stator more compact in both the axial and radial directions, which is beneficial for the miniaturization of the flat wire motor. Furthermore, except for the portion with holes at the top of the flat wire motor housing, the axial thickness of the neutral busbar is increased, while its radial width is reduced. To facilitate complete terminal welding, the U-phase, V-phase, and W-phase lead-out buses typically have a radial width smaller than their axial thickness, while the neutral busbar is wider but thinner axially. Therefore, when a single layer of neutral busbars runs parallel to the three U-phase, V-phase, and W-phase lead-out buses, the neutral busbar needs to be thicker to accommodate the thicker U-phase, V-phase, and W-phase lead-out buses. Then, the radial width is reduced accordingly to ensure sufficient space for the U-phase, V-phase, and W-phase lead-out buses to operate side-by-side. The U-phase busbar, V-phase busbar, and W-phase busbar are all single-sided welded to the welding end, which facilitates the welding between the U-phase busbar, V-phase busbar, W-phase busbar, and welding end.

[0020] In one embodiment, along the circumferential direction of the motor stator, the neutral bus includes a neutral bus end section and a neutral bus center section, wherein the radial width W1 of the neutral bus center section is equal to the radial width W of the neutral bus end section. n .

[0021] In one embodiment, the axial thickness of the central section of the neutral busbar is equal to the axial thickness of the final section of the neutral busbar.

[0022] In one embodiment, the radial width of the neutral bus is smaller than the axial thickness of the neutral bus.

[0023] A third aspect of this application provides a powertrain including a reducer and a flat wire motor of any of the first aspects described above, wherein the flat wire motor is connected to the reducer in a transmission manner.

[0024] A fourth aspect of this application provides a vehicle including wheels and the powertrain described in the second aspect above, the powertrain being used to drive the wheels.

[0025] The powertrain and vehicle provided in this application include the aforementioned flat wire motor. Therefore, the powertrain and vehicle provided in this application solve the same technical problems and have the same technical effects as the flat wire motor in the above-mentioned technical solutions, and will not be repeated here. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of the structure of a powertrain provided in an embodiment of this application;

[0028] Figure 3 One of the partial structural schematic diagrams of a flat wire motor provided in an embodiment of this application;

[0029] Figure 4 This is a second partial structural schematic diagram of a flat wire motor provided in an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the structure of a conventional flat wire motor provided in an embodiment of this application;

[0031] Figure 6 for Figure 5 The diagram shows a cross-sectional view of the flat wire motor in the first direction AA.

[0032] Figure 7 for Figure 5 The diagram shows a cross-sectional view of the flat wire motor in the second direction BB.

[0033] Figure 8 This is a schematic diagram of the structure of a traditional flat wire motor, including the U-phase lead bus, V-phase lead bus, W-phase lead bus, and neutral bus.

[0034] Figure 9 This is a schematic diagram of the structure of a flat wire motor provided in an embodiment of this application;

[0035] Figure 10 A schematic diagram of the structure of the neutral busbar of a flat wire motor provided in this application embodiment;

[0036] Figure 11 for Figure 9 The diagram shows a cross-sectional view of the flat wire motor in the first direction AA.

[0037] Figure 12 for Figure 9 The diagram shows a cross-sectional view of the flat wire motor in the second direction BB.

[0038] Figure 13 This is a schematic diagram of another flat wire motor provided in an embodiment of this application;

[0039] Figure 14 This is a schematic diagram of the neutral busbar structure of another flat wire motor provided in an embodiment of this application.

[0040] Figure label:

[0041] 10000 - Vehicle; 1000 - Powertrain; 2000 - Wheels; 3000 - Transmission mechanism;

[0042] 100 - Flat wire motor; 200 - Reducer;

[0043] 10-Motor rotor;

[0044] 20-Motor stator; 201-Stator core; 202-Stator winding; 203-U-phase busbar; 204-V-phase busbar; 205-W-phase busbar; 206-Neutral busbar;

[0045] U - Three-sided connector; H - Coil end; P1 - Neutral bus center section; P2 - Neutral bus end section; P3 - Neutral bus middle section. Detailed Implementation

[0046] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0047] In the accompanying drawings of the embodiments of this application, solid structures such as parts and components are represented by guide lines; hollow structures such as openings, holes, spaces, and cavities are represented by guide lines with arrows.

[0048] To make the objectives, technical solutions, and advantages of this application clearer, the application will be described in further detail below with reference to the accompanying drawings.

[0049] This application provides a vehicle that is a new energy vehicle powered by electricity. In some embodiments, the new energy vehicle is a pure electric vehicle, a hybrid electric vehicle, or a fuel cell electric vehicle. In other embodiments, the new energy vehicle is a vehicle that uses a high-efficiency energy storage device such as a supercapacitor, flywheel battery, or flywheel energy storage device as its power source.

[0050] Figure 1 This is a structural schematic diagram of a vehicle provided as an embodiment of this application. (Refer to...) Figure 1 The vehicle 10000 includes wheels 2000 and a powertrain 1000. The powertrain 1000 is used to drive the vehicle 10000 to rotate, thereby enabling the vehicle 10000 to move.

[0051] Reference Figure 1 The vehicle 1000 also includes a transmission mechanism 3000, which is used to drive the powertrain 1000 and the wheels 2000. The powertrain 1000 converts electrical energy into mechanical energy and drives the wheels 2000 to rotate through the transmission mechanism 3000, thereby enabling the vehicle 1000 to move.

[0052] exist Figure 1 In the given embodiment, the powertrain 1000 is used to drive the rear wheels (wheels 2000 on the side closest to the rear of the vehicle) of the vehicle 10000 to rotate, and the front wheels of the vehicle 10000 are used to achieve steering. The vehicle 10000 is more responsive when steering and more stable when cornering.

[0053] In other embodiments, the powertrain 1000 is used to drive the front wheels (wheels 2000 on the side closest to the front of the vehicle) of the vehicle 10000 to rotate. The front wheels are used to achieve driving and steering. The front-wheel drive system has a simple structure, fewer parts, lighter weight, reduced power loss, higher transmission efficiency, and lower fuel consumption and cost.

[0054] Figure 2 This is a schematic diagram of a powertrain provided in an embodiment of this application. (Refer to...) Figure 2The structure shown in the dashed box is the powertrain 100. The powertrain 1000 includes a flat wire motor 100 and a reducer 200, which are connected in a transmission manner. The flat wire motor 100 converts electrical energy into rotational mechanical energy and outputs torque to the reducer 200. The reducer 200 includes a gear set (not shown). The reducer 200 reduces the rotational speed and increases the torque through the gear set, transmitting power to the transmission mechanism 3000, and then to the wheel 2000 to drive the wheel 2000 to rotate.

[0055] Currently, the performance requirements for generators and drive motors in electric vehicle power systems are becoming increasingly stringent, leading to a rise in the use of flat-wire motors with high slot fill ratios. In recent years, technologies have been developed that enable inexpensive round-wire motors to achieve near-flat-wire performance with minimal coil length and the same slot fill ratio as flat-wire motors, and these technologies are already in use. However, flat-wire motors still have room for further performance improvement, such as reducing coil end height, shortening coil length, and increasing slot fill ratio. This application investigates issues related to the neutral bus and the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus.

[0056] Figure 3 This is one of the partial structural schematic diagrams of a flat wire motor provided in an embodiment of this application. Figure 4 This is a second partial structural schematic diagram of a flat wire motor provided in an embodiment of this application. The diagram illustrates the axial direction, circumferential direction, and radial direction of the motor stator 20.

[0057] Figure 5 This is a schematic diagram of a conventional flat wire motor provided as an embodiment of this application. (Combined with...) Figure 3 , Figure 4 and Figure 5 As shown, the stator 20 of the flat wire motor includes a stator core 201 and a stator winding 202, a U-phase lead bus 203, a V-phase lead bus 204, a W-phase lead bus 205, a neutral bus 206, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead bus 203 is used to connect the multiple U-phase leads, the V-phase lead bus 204 is used to connect the multiple V-phase leads, the W-phase lead bus 205 is used to connect the multiple W-phase leads, and the neutral bus 206 is used to connect the multiple neutral leads.

[0058] Figure 6 for Figure 5 The diagram shows a cross-sectional view of the flat wire motor in the first direction AA. Figure 7 for Figure 5 The diagram shows a cross-sectional view of the flat wire motor in the second direction BB.

[0059] In traditional flat-wire motors, the connection between the neutral busbar and the welded end is a single-sided joint. Figure 8 This is a schematic diagram of the structure of the U-phase lead bus, V-phase lead bus, W-phase lead bus, and neutral bus of a traditional flat-wire motor. Figure 8 As shown, this flat wire motor forms a three-sided connector U by removing the rectangular portion at the end of the neutral busbar. To ensure the conductive cross-sectional area, reliable welding is required on all three sides of the three-sided connector. This is much more difficult than the single-sided welding of the previous single-sided connector. Therefore, there is an urgent need for a flat wire motor that can reduce the axial dimension of the flat wire motor and facilitate welding between the neutral busbar and the welding end.

[0060] Figure 9 This is a schematic diagram of the structure of a flat wire motor provided in an embodiment of this application. Figure 10 This is a schematic diagram of the structure of a neutral busbar 206 for a flat wire motor provided in an embodiment of this application. (Combined with...) Figure 9 and Figure 10 As shown, the stator 20 of the flat wire motor includes a stator core 201 and a stator winding 202, a U-phase lead bus 203, a V-phase lead bus 204, a W-phase lead bus 205, a neutral bus 206, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead bus 203 is used to connect the multiple U-phase leads, the V-phase lead bus 204 is used to connect the multiple V-phase leads, the W-phase lead bus 205 is used to connect the multiple W-phase leads, and the neutral bus 206 is used to connect the multiple neutral leads. Wherein:

[0061] An opening is provided on the top of the housing of the flat wire motor corresponding to the phase terminals of the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 are located on the first layer of the solder joint, and the neutral bus 206 is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer.

[0062] Except for the portion corresponding to the opening, the radial width of the neutral bus 206 gradually narrows from the center to both ends, so that the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 are arranged with the neutral bus 206 in the first layer.

[0063] Figure 11 for Figure 9 The diagram shows a cross-sectional view of the flat wire motor in the first direction AA. Figure 12 for Figure 9 The diagram shows a cross-sectional view of the flat wire motor in the second direction BB. (Combined with...) Figure 6 and Figure 11 It can be seen that the height H at the coil end is reduced by 5 mm. Combined with... Figure 7 and Figure 12 It can be seen that the height of the coil end is reduced by 5 mm.

[0064] In this embodiment, the U-phase busbar, V-phase busbar, and W-phase busbar 202 can be U-phase busbar, V-phase busbar, and W-phase busbar, respectively. The portion that cannot be lowered in the second layer should be located at the three-phase outlet without a ceiling. At the three-phase socket, there is a space at the top of the housing, through which the UVW phase terminals emerge. The radial width of the neutral busbar 206 cannot narrow at the center, and the U-phase busbar, V-phase busbar, and W-phase busbar cannot be lowered from the second layer to the first layer. However, since there is a space in the center of the ceiling for the three-phase socket, the overall ceiling height can be reduced even with a two-layer structure. The overall height of the flat-wire motor can be reduced by approximately 5 mm with almost no impact on motor performance.

[0065] In the flat wire motor provided in this embodiment, because the phase terminals of the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 extend axially upwards towards the stator core, and in the portion of the flat wire motor housing with an opening at the top, along the axial direction of the stator core, the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located one layer above the solder joint, while the neutral bus 206 is raised to the second layer. This reduces the axial dimension of the motor stator and effectively utilizes the radial space of the motor stator, making the motor stator more compact in both the axial and radial directions, which is beneficial for the miniaturization of the flat wire motor. Furthermore, except for the portion of the flat wire motor housing with an opening at the top, the radial width of the neutral bus 206 gradually narrows from the center to both ends, and both the neutral bus 206 and the neutral bus 205 are lowered to one layer above the solder joint. In the neutral busbar 206, because the neutral busbar 206 has a current-splitting function at both ends along the circumference of the motor stator, the current density along the circumference of the motor stator gradually decreases from the middle to both ends of the neutral busbar 206. This allows the central section of the neutral busbar 206 to withstand a higher current density, reducing unnecessary material consumption and lowering the weight and cost of the neutral busbar 206, thereby contributing to a reduction in the weight and cost of the flat wire motor. Specifically, the U-phase lead busbar 203, the V-phase lead busbar 204, and the W-phase lead busbar 205 are all single-sided welded to the welding end, facilitating welding between the U-phase lead busbar 203, the V-phase lead busbar 204, the W-phase lead busbar 205, and the welding end.

[0066] In one embodiment, such as Figure 10 As shown, along the circumferential direction of the motor stator 20, the neutral bus 206 includes a terminal section P2 and a central section P1. The radial width W1 of the central section P1 is greater than the radial width W1 of the terminal section P2. n .

[0067] In the neutral bus 206, because the neutral bus 206 has a current-splitting function at both ends along the circumferential direction of the motor stator, the current density along the circumferential direction of the motor stator gradually decreases from the middle to both ends of the neutral bus 206. The central section P1 of the neutral bus is located between the two end sections P2 of the neutral bus, and the radial dimension of the central section P1 along the motor stator is larger than the radial dimension of at least one end section P2 along the motor stator. This allows the central section P1 to withstand a higher current density. Furthermore, by rationally designing the radial dimension of the end section P2 along the motor stator, unnecessary material consumption of the neutral bus 206 is reduced while ensuring current transmission, thus lowering the weight and cost of the neutral bus 206. This, in turn, helps to reduce the weight and cost of the flat wire motor.

[0068] In this embodiment, to reduce the height of the UVW phase terminals, the axial height of the neutral busbar 206 at the three-phase outlet is increased from one layer to two layers. Then, the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar are placed on an empty layer and connected to the terminals on the layer.

[0069] In this embodiment, the current flowing to the final neutral point is greatest at the center of the neutral busbar 206 and least at both ends. Therefore, the width of the neutral busbar 206 at both ends must be narrowed according to the magnitude of the current. The radial dimension W of the final section P2 of the neutral busbar along the motor stator 20 is... n The following conditions must be met between the center section P1 of the neutral bus and the radial dimension W1 of the motor stator 20:

[0070] In one embodiment, such as Figure 10 As shown, along the circumferential direction of the motor stator 20 from the end section P2 of the neutral busbar to the center section P1 of the neutral busbar, the size of the neutral busbar 206 gradually increases in the radial direction of the motor stator 20.

[0071] Because the current density at the center section P1 of the neutral busbar 206 is higher than the current density at the end section P2, the dimension of the neutral busbar 206 in the radial direction of the motor stator is gradually increased from the end section P2 to the center section P1 along the circumferential direction of the motor stator. This is to accommodate the higher current density at the center section P1 compared to the end section P2. The heat dissipation density is increased by gradually increasing the size of the neutral busbar 206 along the radial direction of the motor stator from the end section P2 of the neutral busbar to the center section P1 of the neutral busbar. This creates a radial thermal gradient between the end section P2 and the center section P1 of the neutral busbar, allowing heat to diffuse more efficiently from the high-temperature region of the center section P1 to the regions of the two end sections P2, thus enhancing the heat dissipation capacity of the neutral busbar 206.

[0072] like Figure 10 As shown, the neutral bus 206 also includes a neutral bus intermediate section P3, the radial width of which is W. x The radial width W of the final section P2 of the neutral busbar is greater than or equal to that of the neutral busbar. n And less than or equal to the radial width W1 of the center segment P1 of the neutral line busbar, where 2n represents the number of neutral points of the stator winding 202, x∈{1,2,...n}.

[0073] In one embodiment, W x The following conditions must be met between W1 and W1:

[0074] In one embodiment, Figure 13 This is a schematic diagram of another flat wire motor provided in an embodiment of this application. Figure 14 This is a schematic diagram of the structure of a neutral busbar 206 for another flat wire motor provided in an embodiment of this application. (Combined with...) Figure 13 and Figure 14 As shown, the stator of the flat wire motor includes a stator core, stator windings 202, a U-phase lead busbar 203, a V-phase lead busbar 204, a W-phase lead busbar 205, a neutral busbar 206, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead busbar 203 connects the multiple U-phase leads, the V-phase lead busbar 204 connects the multiple V-phase leads, the W-phase lead busbar 205 connects the multiple W-phase leads, and the neutral busbar 206 connects the multiple neutral leads. Wherein:

[0075] An opening is provided on the top of the housing of the flat wire motor corresponding to the phase terminals of the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 are located on the first layer of the solder joint, and the neutral bus 206 is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer.

[0076] Except for the portion corresponding to the opening, the radial width of the neutral bus 206 gradually narrows from the center to both ends, so that the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 are arranged with the neutral bus 206 in the first layer.

[0077] Figure 13 The cross-sectional view of the flat wire motor shown in the first direction AA is similar to... Figure 11 resemblance. Figure 14 The cross-sectional view of the flat wire motor shown in the second direction BB is the same as... Figure 12 Similar. Combination Figure 6 and Figure 11 It can be seen that the height H at the coil end is reduced by 5 mm. Combined with... Figure 7 and Figure 12 It can be seen that the height of the coil end is reduced by 5 mm.

[0078] In the flat wire motor provided in this application, since the phase terminals of the U-phase lead bus 203, the V-phase lead bus 204, and the W-phase lead bus 205 extend axially upwards towards the stator core, and the portion of the flat wire motor housing with an opening at the top, along the axial direction of the stator core, the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located one layer above the solder joint, and the neutral bus 206 is raised to the second layer. This reduces the axial dimension of the motor stator on the one hand, and effectively utilizes the radial space of the motor stator on the other hand, making the motor stator more compact in both the axial and radial directions, which is beneficial to the miniaturization of the flat wire motor. Furthermore, except for the portion with holes at the top of the housing of the flat wire motor, the axial thickness of the neutral bus 206 is increased and the radial width of the neutral bus 206 is reduced. In order to facilitate complete welding of the terminals, the radial width of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus is usually smaller than the axial thickness. The neutral bus 206 is wider, but the axial thickness is thinner. Therefore, when the neutral busbar 206 of the first layer is routed parallel to the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar, the neutral busbar 206 needs to be relatively thick to accommodate the relatively thick U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar. Then, the radial width is correspondingly reduced to ensure sufficient space for the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar to operate side-by-side. Specifically, the U-phase lead busbar 203, the V-phase lead busbar 204, and the W-phase lead busbar 205 are all single-sided welded to the welding end, facilitating welding between the U-phase lead busbar 203, the V-phase lead busbar 204, the W-phase lead busbar 205, and the welding end.

[0079] In one embodiment, such as Figure 14 As shown, along the circumference of the motor stator, the neutral bus 206 includes a neutral bus end section P2 and a neutral bus center section P1, and the radial width of the neutral bus center section P1 is equal to the radial width of the neutral bus end section P2.

[0080] In one embodiment, such as Figure 14 As shown, along the axial direction of the motor stator, the neutral bus 206 further includes a neutral bus intermediate section P3, the radial width of the neutral bus intermediate section P3 is equal to the radial width of the neutral bus center section P1 and the radial width of the neutral bus end section P2.

[0081] In one embodiment, such as Figure 14As shown, the axial thickness of the central section P1 of the neutral busbar is equal to the axial thickness of the final section P2 of the neutral busbar.

[0082] In one embodiment, such as Figure 14 As shown, the axial thickness of the middle section P3 of the neutral busbar, the axial thickness of the center section P1 of the neutral busbar, and the axial thickness of the end section P2 of the neutral busbar are equal.

[0083] In one embodiment, such as Figure 14 As shown, the radial width of the neutral line bus 206 is smaller than the axial thickness of the neutral line bus 206.

[0084] It should be understood that the neutral bus in the embodiments of this application may also be called the neutral point copper bus, and the embodiments of this application do not specifically limit its name.

[0085] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A flat wire motor, characterized in that, The stator of the flat wire motor includes a stator core, stator windings, a U-phase lead busbar, a V-phase lead busbar, a W-phase lead busbar, a neutral busbar, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead busbar connects the multiple U-phase leads, the V-phase lead busbar connects the multiple V-phase leads, the W-phase lead busbar connects the multiple W-phase leads, and the neutral busbar connects the multiple neutral leads. Wherein: An opening is provided on the top of the housing of the flat wire motor corresponding to the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located on the first layer of the solder joint, and the neutral bus is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer. Except for the portion corresponding to the opening, the radial width of the neutral bus gradually narrows from the center to both ends of the neutral bus, so that the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are arranged with the neutral bus in the first layer.

2. The motor according to claim 1, wherein, Along the circumferential direction of the motor stator, the neutral busbar includes a neutral busbar end section and a neutral busbar center section, wherein the radial width W1 of the neutral busbar center section is greater than the radial width W of the neutral busbar end section. n .

3. The motor according to claim 2, wherein, The radial width W of the final section of the neutral line busbar n The radial width W1 of the center section of the neutral busbar satisfies the following condition: W n ≥W1 / n.

4. The motor according to claim 2 or 3, wherein, Along the circumferential direction of the motor stator, the neutral busbar also includes a neutral busbar intermediate section, the radial width W of which is... x The radial width W of the last section of the neutral busbar is greater than or equal to that of the neutral busbar. n And less than or equal to the radial width W1 of the center segment of the neutral busbar, where 2n represents the number of neutral points of the stator winding, x∈{1,2,...n}.

5. The motor according to claim 4, wherein, The radial width W at the middle end of the neutral line busbar x The radial width W1 of the center section of the neutral busbar satisfies the following condition: W x ≥W1×((n-x+1) / n).

6. A flat wire motor, characterized in that, The stator of the flat wire motor includes a stator core, stator windings, a U-phase lead busbar, a V-phase lead busbar, a W-phase lead busbar, a neutral busbar, multiple U-phase leads, multiple V-phase leads, multiple W-phase leads, and multiple neutral leads. The U-phase lead busbar connects the multiple U-phase leads, the V-phase lead busbar connects the multiple V-phase leads, the W-phase lead busbar connects the multiple W-phase leads, and the neutral busbar connects the multiple neutral leads. Wherein: An opening is provided on the top of the housing of the flat wire motor corresponding to the phase terminals of the U-phase lead bus, the V-phase lead bus, and the W-phase lead bus, so that the phase terminals extend upward along the axial direction of the stator core. The U-phase lead bus, the V-phase lead bus, and the W-phase lead bus are located on the first layer of the solder joint, and the neutral bus is raised to the second layer, wherein the second layer is the space farther away from the stator core compared to the first layer. Except for the portion corresponding to the opening, the axial thickness of the neutral busbar is increased and the radial width is reduced, so that the U-phase lead busbar, the V-phase lead busbar, and the W-phase lead busbar are arranged with the neutral busbar in the first layer.

7. The flat wire motor according to claim 6, characterized in that, Along the circumferential direction of the motor stator, the neutral busbar includes a neutral busbar end section and a neutral busbar center section, wherein the radial width W1 of the neutral busbar center section is equal to the radial width W of the neutral busbar end section. n .

8. The flat wire motor according to claim 7, characterized in that, The axial thickness of the central section of the neutral line busbar is equal to the axial thickness of the final section of the neutral line busbar.

9. The flat wire motor according to claim 8, characterized in that, The radial width of the neutral line bus is less than the axial thickness of the neutral line bus.

10. A powertrain, characterized in that, The powertrain includes a reducer and a flat wire motor as described in any one of claims 1 to 9, wherein the flat wire motor is drive-connected to the reducer.

11. A vehicle, characterized in that, The vehicle includes wheels and the powertrain of claim 9, the powertrain being used to drive the wheels.

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