Flat wire motor, powertrain, and vehicle

Abstract

The application provides a flat wire motor, a power assembly and a vehicle. The flat wire motor comprises a stator core, a flat wire winding and a busbar. An inner circumferential surface of the stator core comprises a plurality of stator slots, and an axial end surface of the stator core comprises a plurality of first oil supply holes. The plurality of stator slots are used for fixing the flat wire winding, and the busbar is used for electrically connecting the flat wire winding. The plurality of first oil supply holes are distributed on the axial end surface of the stator core along the circumferential direction of the flat wire motor. The busbar is arranged outside the part of the flat wire winding exposed to the axial end surface along the radial direction of the stator core. The interval between the busbar and the axial end surface is less than the length of the flat wire winding protruding from the axial end surface. Each first oil supply hole is used for outputting cooling oil to at least one of the part of the flat wire winding exposed to the axial end surface or the busbar. The flat wire motor provided by the application improves the heat dissipation effect of the busbar and the flat wire winding by reasonably arranging the busbar and the flat wire winding, reduces the volume of the flat wire motor, and is beneficial to saving the internal space of the power assembly and the vehicle.

Description

Technical Field

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

[0002] The powertrain outputs power to drive the vehicle. The powertrain includes a flat-wire motor. The motor controller is electrically connected to the flat-wire windings of the motor via a busbar and transmits a drive current signal to the flat-wire windings. In response to the drive current signal, the flat-wire windings generate an alternating magnetic field to drive the motor rotor. The busbars and flat-wire windings generate heat during operation, requiring heat dissipation to improve the powertrain's performance and lifespan. Utility Model Content

[0003] This application provides a flat-wire motor, a powertrain, and a vehicle. The flat-wire motor, through the rational arrangement of the busbars and flat-wire windings, improves the heat dissipation of both and reduces the size of the flat-wire motor, thus saving internal space in the powertrain and vehicle.

[0004] In a first aspect, this application provides a flat wire motor, which includes a stator core, flat wire windings, and a busbar. The inner circumferential surface of the stator core includes a plurality of stator slots, and the axial end face of the stator core includes a plurality of first oil inlets. The plurality of stator slots are used to fix the flat wire windings, and the busbar is used to electrically connect the flat wire windings. The plurality of first oil inlets are distributed circumferentially on the axial end face of the stator core, and the busbar is arranged radially on the outside of the portion of the flat wire windings exposed on the axial end face. The distance between the busbar and the axial end face is less than the length of the flat wire windings extending out of the axial end face. Each first oil inlet is used to output cooling oil to at least one portion of the flat wire windings exposed on the axial end face or to the busbar.

[0005] The flat wire motor provided in this application uses a stator core to fix the flat wire windings and is electrically connected to the flat wire windings via a busbar. The busbar is used to receive drive current signals, and the flat wire windings respond to the drive current signals to generate an alternating magnetic field to drive the motor rotor of the flat wire motor to rotate and output driving force.

[0006] The flat wire motor provided in this application also outputs cooling oil to the flat wire windings and busbars through a first oil inlet on the axial end face of the stator core. By arranging the busbars radially along the stator core outside the flat wire windings and close to the stator core, the axial distance between the stator core and the busbars is shortened. Because the first oil inlet is approximately along the axial direction of the stator core towards the portion of the busbars and flat wire windings exposed on the axial end face, more of the cooling oil output from the first oil inlet can reach the busbars after reflection by the flat wire windings, or more can reach the flat wire windings after reflection by the busbars, thereby improving the heat dissipation effect on the busbars and flat wire windings and improving the power performance and service life of the flat wire motor provided in this application.

[0007] The flat wire motor provided in this application also makes reasonable use of the space outside the flat wire winding by arranging the busbars radially along the stator core on the outside of the flat wire winding, thereby compressing the length dimension of the flat wire motor along the axial direction of the stator core, which is conducive to the miniaturization of the flat wire motor.

[0008] In one implementation, multiple first oil supply holes are arranged spirally along the circumference of the stator core. The distance between the first oil supply hole at the starting point of the spiral and the flat wire winding is smaller than the distance between the first oil supply hole at the ending point of the spiral and the flat wire winding, but larger than the radius of the outer circumference of the flat wire winding. The distance between the circumferential busbar of the stator core and the first oil supply hole at the starting point of the spiral is smaller than the distance between the busbar and the first oil supply hole at the ending point of the spiral.

[0009] In this implementation, multiple first oil outlet holes are arranged radially along the stator core on the outer side of the flat wire winding. The spiral arrangement of these first oil outlet holes increases the initial velocity of the output cooling oil, thereby extending the oil spray distance to ensure effective heat dissipation for the busbars and flat wire windings. Specifically, the spiral arrangement of the first oil outlet holes can be formed by folding the laminations at the ends of the stator core. In this case, the initial velocity and flow rate of the cooling oil output from the first oil outlet hole near the spiral starting point along the circumference of the stator core are higher, resulting in better heat dissipation for the busbars.

[0010] In one implementation, a plurality of second oil supply holes are further provided on the axial end face. These second oil supply holes are spaced apart along the circumference of the stator core on the axial end face. The second oil supply holes are used to supply cooling oil to the portion of the flat wire winding exposed on the axial end face. Specifically, along the radial direction of the stator core, the second oil supply holes are arranged between the first oil supply holes and the inner hole of the stator core; along the circumference of the stator core, each second oil supply hole is located between two adjacent stator slots.

[0011] In this implementation, the flat wire winding has a larger radial dimension along the stator core. By outputting cooling oil to the portion of the flat wire winding exposed on the axial end face through the second oil outlet holes arranged between the stator slots, the heat dissipation effect of the flat wire winding can be improved.

[0012] In one implementation, each stator slot along the radial direction of the stator core is used to fix N layers of flat wire conductors. Among the multiple flat wire conductors located in the outermost layer of the stator slot in the flat wire winding, there are multiple first flat wire conductors. Among the multiple flat wire conductors located in the innermost layer of the stator slot in the flat wire winding, there are multiple second flat wire conductors. The multiple first flat wire conductors and the multiple second flat wire conductors are respectively used to conduct to the busbar.

[0013] In this implementation, the radial flat wire winding along the stator core includes multiple layers of flat wire conductors. The flat wire winding is connected to the busbar through the outermost and innermost partial flat wire conductors, which facilitates the mutual conduction between the flat wire conductors in the middle layer to transmit the drive current signal. This simplifies the bending shape of each flat wire conductor in the flat wire winding and facilitates the conduction between the outer busbar and multiple flat wire conductors.

[0014] In one implementation, the flat wire winding includes a multi-phase winding, each phase winding includes multiple branches, each branch includes multiple flat wire conductors connected in series, and each branch includes a first flat wire conductor and a second flat wire conductor.

[0015] In this implementation, multiphase windings are alternately wound sequentially in different stator slots along the circumference of the stator core. Each phase winding is used to respond to one phase of alternating current in the drive current signal, thereby causing the motor stator to form an alternating magnetic field. Multiple flat wire conductors in the same branch are sequentially connected radially along the stator core and are connected to the busbar through the outermost first flat wire conductor and the innermost second flat wire conductor, which facilitates the assembly of the flat wire motor provided in this application.

[0016] In one implementation, the number of flat wire conductors sequentially conducted in each branch of the same phase winding is equal. Therefore, along the circumference of the stator core, the included angle between the first and second flat wire conductors in each branch of each phase winding is equal, and the span of the first and second flat wire conductors on the busbar in each branch is equal. This reduces the difference in transmission loss of AC current in each phase of the drive current signal and improves the response accuracy of the flat wire motor of this application to the drive current signal.

[0017] In one implementation, the first flat conductor includes a first bend, the first bend extending radially toward the busbar and communicating with the busbar, wherein the distance between the first bend and the axial end face along the axial direction of the stator core is less than the length of the remaining flat conductors in the flat wire winding extending beyond the axial end face.

[0018] In this implementation, the first flat conductor is located at the outermost layer of the flat conductor winding. Along the radial direction of the stator core, the first flat conductor is arranged adjacent to the busbar. The first bent section can be bent and extended toward the busbar at a position relatively close to the stator core, thereby making the axial distance between the stator core and the busbar smaller, ensuring the cooling effect of the cooling oil output from the first oil outlet on the busbar.

[0019] In one implementation, the first bend is fitted to the side of the busbar facing the axial end face.

[0020] In this implementation, the first bending section along the axial direction of the stator core is located between the busbar and the stator core. The first bending section is attached to the busbar from the outside of the busbar, which helps to compress the axial dimension of the busbar and improve the heat dissipation effect of the busbar.

[0021] In one implementation, the second flat conductor includes a second bend, which extends radially toward the busbar and is in communication with the busbar, wherein the distance between the second bend and the axial end face of the stator core is greater than the length of the remaining flat conductors in the flat wire winding extending beyond the axial end face.

[0022] In this implementation, the second flat conductor is located in the innermost layer of the flat conductor winding, and multiple layers of flat conductors are included between the second flat conductor and the busbar along the radial direction of the stator core. The second bent section bends and extends towards the busbar at a position relatively away from the stator core, thereby crossing the multiple layers of flat conductors and realizing the function of conducting with the busbar.

[0023] In one implementation, the second bend is attached to the side of the busbar away from the axial end face.

[0024] In this implementation, the second bending section along the axial direction of the stator core is located on the side of the busbar away from the stator core. The second bending section is attached to the busbar from the outside, which helps to compress the axial dimension of the busbar and improve the heat dissipation effect of the busbar.

[0025] In one implementation, a first and a second bend along the axial direction of the stator core are arranged on both sides of the busbar. This results in a larger axial distance between the first and second bends, preventing interference between the drive current signals transmitted by the two bends.

[0026] In one implementation, the second bend along the axial direction of the stator core is spaced apart from the remaining flat conductors.

[0027] In this implementation, by arranging the second bent section at intervals along the axial direction of the stator core outside the remaining flat conductors, it is possible to avoid the second bent section from overlapping and conducting with the remaining flat conductors, thus ensuring the reliable operation of the flat wire winding.

[0028] In one implementation, the first flat conductor and the second flat conductor of the same branch are inserted into different stator slots, and the first flat conductor and the second flat conductor of the same branch are used to bend parallel to the radial direction of the stator core and respectively connect to the busbar.

[0029] In this implementation, the first and second flat conductors of the same branch are inserted into different stator slots, which facilitates the regular winding of multiple flat conductors and the series conduction of the remaining flat conductors between the first and second flat conductors of the same branch. It also avoids contact and conduction between multiple flat conductors of different branches. Furthermore, by bending the first and second flat conductors of the same branch parallel to the radial direction of the stator core to form a pair of parallel extending first and second bent segments, the bending shape of the flat wire winding is simplified, making the bent segments more compactly arranged circumferentially along the stator core.

[0030] In one implementation, the first flat conductors and the second flat conductors are distributed in different stator slots.

[0031] In one implementation, the flat wire winding includes three-phase windings, with each phase winding including two branches.

[0032] In one implementation, the bus includes a neutral point bus and multiple single-phase buses, which are respectively connected to the flat wire winding. Along the radial direction of the stator core, the multiple single-phase buses are arranged between the neutral point bus and the flat wire winding; along the circumferential direction of the stator core, the multiple single-phase buses are arranged sequentially at intervals.

[0033] In this implementation, the neutral point bus and multiple single-phase bus are arranged radially at intervals along the stator core. The cooling oil output from the first oil outlet can reach the neutral point bus and multiple single-phase bus without obstruction, thereby improving the overall heat dissipation effect of the cooling oil on the bus.

[0034] In one implementation, each single-phase busbar is used to be connected to each phase winding respectively, and each single-phase busbar is used to transmit one phase of AC current in the drive current signal.

[0035] In one implementation, a neutral point bus is used to connect with each phase winding separately, and the neutral point bus is used to provide a unified zero position for each phase winding, thereby improving the response accuracy of the flat wire motor provided in this application to the drive current signal.

[0036] In one implementation, the neutral point bus includes multiple first arc segments and multiple second arc segments. The multiple first arc segments and multiple second arc segments are alternately arranged and sequentially connected along the circumference of the stator core. Along the axial direction of the stator core, the multiple first arc segments are located between the axial end face and the multiple second arc segments. Each first arc segment and each second arc segment is used to connect with at least one flat wire conductor in the flat wire winding.

[0037] In this implementation, the axial neutral point busbar along the stator core includes two types of arc segments with different distances from the axial end face. These two types of arc segments are arranged alternately along the circumference of the stator core, facilitating contact and conduction between the neutral point busbar and multiple first flat conductors and multiple second flat conductors. The multiple first arc segments along the axial direction of the stator core are closer to the axial end face, resulting in better heat dissipation from the first oil outlets. The circumferential spacing of the first arc segments along the stator core ensures more uniform overall heat dissipation from the first oil outlets to the neutral point busbar, and further enhances the heat dissipation effect on the alternately arranged second arc segments.

[0038] In one implementation, each single-phase busbar includes an axial segment and two arc segments along the axial direction of the stator core. The two opposite ends of the axial segment are used to connect the two arc segments respectively. The two arc segments are arranged on both sides of the axial segment along the circumference of the stator core. Each arc segment is used to conduct at least one flat wire conductor in the flat wire winding.

[0039] In this implementation, each single-phase busbar along the axial direction of the stator core is connected to two branches of the same phase winding via two arc segments spaced differently from the axial end face. One branch is connected to the single-phase busbar via a first flat wire conductor, and the other branch is connected to the single-phase busbar via a second flat wire conductor. One of the arc segments is closer to the axial end face along the axial direction of the stator core, which can improve the heat dissipation effect of the first oil outlet on each single-phase busbar.

[0040] In one implementation, each single-phase busbar includes two welded sections, each welded section being connected to an axial section by an arc segment. Each welded section is used to extend radially toward the neutral point busbar along the stator core, and each welded section is used to engage with a flat conductor in the flat wire winding.

[0041] In this implementation, the arc segment of the single-phase busbar along the radial direction of the stator core is arranged between the neutral point busbar and the flat wire winding. The radial width of the single-phase busbar is limited. By having two welded segments respectively attached to the first bent segment of the first flat wire conductor and the second bent segment of the second flat wire conductor, the contact area between the single-phase busbar and the first bent segment and the second bent segment can be increased respectively, ensuring that the single-phase busbar is reliably connected to the first flat wire conductor and the second flat wire conductor respectively.

[0042] In one implementation, the width of the radial neutral point busbar along the stator core is greater than the width of the single-phase busbar. This increases the contact area between the neutral point busbar and the first and second flat conductors, ensuring reliable conduction between the neutral point busbar and the first and second flat conductors, respectively.

[0043] In one implementation, one of the two arc segments of each single-phase busbar is aligned with the axial direction of the stator core, and the other arc segment of each single-phase busbar is also aligned with the axial direction of the stator core.

[0044] In this implementation, the arc segments of each single-phase busbar are aligned, and the first and second bending segments used to connect with the single-phase busbar can also be aligned sequentially along the axial direction of the stator core, thereby simplifying the bending shape of each flat conductor in the flat wire winding.

[0045] One implementation involves stacking and arranging an arc segment of one single-phase busbar and another arc segment of the other single-phase busbar along the axial direction of the stator core. This results in a more compact arrangement of the single-phase buses along the circumference of the stator core, shortening the circumferential length of the buses.

[0046] In one implementation, all single-phase busbars have the same shape. This reduces the manufacturing cost of the flat wire motor provided in this application and improves assembly convenience.

[0047] In one implementation, along the axial direction of the stator core, the neutral point busbar includes two opposite sides located on either side of each single-phase busbar.

[0048] In this implementation, the radial neutral point busbars of the stator core are arranged outside each single-phase busbar. The first and second bends used for connection with the neutral point busbars must cross the single-phase busbars radially across the stator core. The single-phase busbars extend from the opposite sides of the axial neutral point busbars of the stator core, preventing short circuits caused by overlap between the first and second bends used for connection with the neutral point busbars and the single-phase busbars.

[0049] In one implementation, each single-phase busbar includes a welding seat for connection to the copper busbar of the motor controller and for transmitting one phase of AC current in the drive current signal, and each welding seat extends radially toward the neutral point busbar along the stator core.

[0050] In this implementation, the single-phase busbar is connected to each copper busbar of the motor controller via a welding base. Each single-phase busbar is used to receive one phase of AC current from the drive current signal through a copper busbar. The radial extension of each welding base along the stator core can shorten the axial dimension of the busbar, which is beneficial for the miniaturization of the flat wire motor provided in this application.

[0051] Secondly, this application provides a powertrain including a motor controller and a flat-wire motor as described in any of the above implementations. The motor controller is electrically connected to the flat-wire motor, and the flat-wire motor outputs driving force in response to a drive current signal transmitted by the motor controller. The powertrain provided by this application has better power performance, longer service life, and smaller size.

[0052] Thirdly, this application provides a vehicle including wheels and a powertrain provided in this application, the powertrain being used to drive the wheels to rotate. The vehicle provided in this application has better power performance and larger interior space. Attached Figure Description

[0053] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0054] Figure 1 This is a schematic diagram of the exterior structure of a vehicle provided in one embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the powertrain provided in one embodiment of this application;

[0056] Figure 3 This is a schematic diagram of the structure of a flat wire motor provided in one embodiment of this application;

[0057] Figure 4 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0058] Figure 5 This is a partially exploded structural diagram of a flat wire motor provided in one embodiment of this application;

[0059] Figure 6 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0060] Figure 7 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0061] Figure 8 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0062] Figure 9 This is a partially exploded structural diagram of a flat wire motor provided in one embodiment of this application;

[0063] Figure 10 This is a partial cross-sectional structural diagram of a flat wire motor provided in one embodiment of this application;

[0064] Figure 11 This is a partial enlarged cross-sectional view of a flat wire motor provided in one embodiment of this application;

[0065] Figure 12 This is a partially exploded structural diagram of a flat wire motor provided in one embodiment of this application;

[0066] Figure 13 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0067] Figure 14 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0068] Figure 15 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0069] Figure 16 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0070] Figure 17 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0071] Figure 18 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0072] Figure 19 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0073] Figure 20 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0074] Figure 21 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0075] Figure 22 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0076] Figure 23 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0077] Figure 24 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0078] Figure 25 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0079] Figure 26 This is a partially exploded structural diagram of a flat wire motor provided in one embodiment of this application;

[0080] Figure 27 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0081] Figure 28 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0082] Figure 29 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application;

[0083] Figure 30 This is a partial structural schematic diagram of a flat wire motor provided in one embodiment of this application.

[0084] Reference numerals: 1000-Vehicle; 1001-Wheel; 1002-Frame; 1003-Power Battery; 500-Powertrain; 400-Motor Controller; 300-Reducer; 100-Flat Wire Motor; 10-Motor Shaft; 20-Motor Rotor; 30-Motor Stator; 31-Stator Core; 311-Inner Hole; 312-Stator Slot; 312a-Stator Slot Assembly; 3121-Wire Slot; 3121a-Wire Slot Layer; 3122 - Slot bottom layer; 3123 - Slot opening layer; 313 - Axial end face; 313a - First axial end face; 313b - Second axial end face; 314 - First oil delivery hole; 314a - First end oil delivery hole; 314b - End oil delivery hole; 315 - Fourth section; 3151 - Lamination; 3152 - First oil delivery sub-hole; 316 - Fifth section; 317 - Second oil delivery hole; 32 - Flat wire winding; 321 - First section; 322 - Second section; 323 - Third section; 32a-phase winding; 324-U-phase winding; 325-V-phase winding; 326-W-phase winding; 33-branch; 331-welding foot; 3311-first welding foot; 3312-second welding foot; 332-flat wire conductor; 3321-straight section; 3322-bent section; 3323-support foot; 3324-first flat wire conductor; 3325-second flat wire conductor; 3326-first bent section; 3327-second bent section; 3328 - Upper surface; 3329 - Lower surface; 40 - Busbar; 41 - First side surface; 42 - Second side surface; 43 - Neutral point busbar; 431 - First arc segment; 432 - Second arc segment; 433 - Third side surface; 434 - Fourth side surface; 44 - Single-phase busbar; 441 - Third arc segment; 442 - Fourth arc segment; 443 - Axial segment; 444 - First welding segment; 445 - Second welding segment; 446 - Welding seat. Detailed Implementation

[0085] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0086] This application provides a flat wire motor, which includes a stator core, flat wire windings, and a busbar. The inner circumferential surface of the stator core includes multiple stator slots, and the axial end face of the stator core includes multiple first oil inlets. The stator slots are used to fix the flat wire windings, and the busbar is used to electrically connect the flat wire windings. The multiple first oil inlets are distributed circumferentially along the axial end face of the stator core, and the busbar is arranged radially along the stator core outside the portion of the flat wire windings exposed on the axial end face. The distance between the busbar and the axial end face is less than the length of the flat wire windings extending beyond the axial end face. Each first oil inlet outputs cooling oil to the portion of the flat wire windings exposed on the axial end face or to at least one of the busbars. The flat wire motor provided by this application has good heat dissipation effect on the busbar and flat wire windings, which can improve power performance and service life, and achieve miniaturization.

[0087] This application provides a powertrain and a vehicle. The powertrain includes a motor controller and a flat-wire motor provided in this application. The motor controller is electrically connected to the flat-wire motor, and the flat-wire motor outputs driving force in response to a drive current signal transmitted by the motor controller. The vehicle includes wheels and the powertrain provided in this application, and the powertrain drives the wheels to rotate. Both the powertrain and the vehicle provided in this application have better power performance and a longer service life. The powertrain is smaller in size, saving interior space in the vehicle.

[0088] Please refer to the above. Figure 1 , Figure 1 This is a schematic diagram of the external structure of a vehicle 1000 provided in one embodiment of this application.

[0089] The vehicle 1000 provided in this application includes wheels 1001 and a powertrain 500. The wheels 1001 are rotatably connected to the frame 1002 of the vehicle 1000, and the powertrain 500 is fixed to the frame 1002 and is connected to the wheels 1001 for transmission. The powertrain 500 drives the wheels 1001 of the vehicle 1000 to rotate, thereby driving the vehicle 1000.

[0090] In one embodiment, the vehicle 1000 provided in this application further includes a power battery 1003. The power battery 1003 is fixed to the vehicle frame 1002 and is used to be electrically connected to the powertrain 500 to provide electrical energy to the powertrain 500. The powertrain 500 is used to receive the electrical energy provided by the power battery 1003 to drive the wheels 1001 to rotate.

[0091] In one embodiment, the vehicle 1000 provided in this application includes a powertrain 500 for driving a plurality of wheels 1001 to rotate. In another embodiment, the vehicle 1000 provided in this application includes a plurality of powertrains 500, each powertrain 500 being used to drive a portion of the plurality of wheels 1001 to rotate.

[0092] Please refer to the above. Figure 2 , Figure 2 This is a schematic diagram of the powertrain 500 provided in one embodiment of this application.

[0093] The powertrain 500 provided in this application includes a motor controller 400 and a flat wire motor 100. The motor controller 400 is electrically connected to the flat wire motor 100. The motor controller 400 transmits a drive current signal to the flat wire motor 100 to control the rotation of the flat wire motor 100. The flat wire motor 100 outputs a drive force in response to the drive current signal transmitted by the motor controller 400 to rotate the wheel 1001.

[0094] In one embodiment, the motor controller 400 receives DC power from the power battery 1003 and converts it into AC power for output to the flat-wire motor 100. The flat-wire motor 100 receives the AC power output from the motor controller 400 and drives the wheel 1001 to rotate.

[0095] In one embodiment, the powertrain 500 provided in this application further includes a reducer 300, which is used to drive the flat wire motor 100 and the wheel 1001. The reducer 300 is used to adjust the speed and torque of the driving force output by the flat wire motor 100, and transmit the adjusted driving force to one or more wheels 1001 through a rear transmission mechanism.

[0096] Please refer to the above. Figure 3 , Figure 3 This is a schematic diagram of the structure of a flat wire motor 100 provided in one embodiment of this application.

[0097] In one embodiment, the flat wire motor 100 includes a motor shaft 10, a motor rotor 20, and a motor stator 30. The motor stator 30 is generally cylindrical and is sleeved around the motor rotor 20. The motor rotor 20 is sleeved around the motor shaft 10 and coaxially fixed to it, allowing it to rotate relative to the motor stator 30 about the axis of the motor shaft 10. The motor shaft 10 is used for transmission connection with a wheel 1001. When the flat wire motor 100 provided in this application is operating, three-phase alternating current from a motor controller 400 is supplied to the motor stator 30 to form an alternating magnetic field. The motor rotor 20 rotates under the action of this alternating magnetic field, driving the motor shaft 10 to rotate. The flat wire motor 100 outputs driving force through the motor shaft 10.

[0098] Please refer to the above. Figures 4 to 7 ,in Figure 4 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 5 This is a partially exploded structural diagram of a flat wire motor 100 provided in one embodiment of this application; Figure 6 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 7 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0099] The motor stator 30 includes a stator core 31 and a flat wire winding 32. The stator core 31 is generally cylindrical and includes an inner hole 311 for housing the motor rotor 20. The inner circumferential surface of the stator core 31 includes multiple stator slots 312. Along the circumference of the stator core 31, the multiple stator slots 312 are evenly distributed on the inner circumferential surface of the stator core 31. Along the radial direction of the stator core 31, each stator slot 312 extends from the inner circumferential surface of the stator core 31 towards the outer circumferential surface. Along the axial direction of the stator core 31, each stator slot 312 penetrates the stator core 31. The multiple stator slots 312 are used to fix the flat wire winding 32. The flat wire winding 32 is generally cylindrical in shape and passes through both ends of the stator slot 312 along the axial direction of the stator core 31, and is wound in each stator slot 312. Alternatively, it can be understood that the stator core 31 includes two axial end faces 313, which are arranged along the axial direction of the stator core 31. Along the axial direction of the stator core 31, the flat wire winding 32 includes a first segment 321, a second segment 322, and a third segment 323 arranged sequentially. The second segment 322 is received within the stator core 31 through a stator slot 312, while the first segment 321 and the third segment 323 protrude from one of the axial end faces 313 of the stator core 31. In one embodiment, the first segment 321 or the third segment 323 of the flat wire winding 32 is used for electrical connection with the motor controller 400, so that the motor stator 30 can generate an alternating magnetic field by passing three-phase alternating current through the flat wire winding 32.

[0100] The flat wire motor 100 provided in this application also includes a busbar 40, which is spaced apart from the stator core 31 along the axial direction of the stator core 31. Alternatively, it can be understood that, along the axial direction of the stator core 31, the busbar 40 is located on one side of one axial end face 313 facing away from the other axial end face 313, and is spaced apart from one axial end face 313. For ease of explanation, the two axial end faces 313 of the stator core 31 are defined as the first axial end face 313a and the second axial end face 313b, respectively. Exemplarily, the first segment 321 of the flat wire winding 32 is exposed on the first axial end face 313a of the stator core 31. The third segment 323 of the flat wire winding 32 is exposed on the second axial end face 313b of the stator core 31. The busbar 40 is located on the side of the first axial end face 313a facing away from the second axial end face 313b along the axial direction of the stator core 31, and is spaced apart from the first axial end face 313a. That is, the busbar 40 and the first section 321 of the flat wire winding 32 are located on the same side of the stator core 31 along the axial direction of the stator core 31, and are relatively close to the first axial end face 313a.

[0101] Along the radial direction of the stator core 31, the busbar 40 is arranged outside the portion of the flat wire winding 32 exposed on the axial end face 313. That is, along the radial direction of the stator core 31, the minimum distance between the busbar 40 and the central axis of the stator core 31 is greater than the maximum distance between the first segment 321 of the flat wire winding 32 and the central axis of the stator core 31. Furthermore, along the radial direction of the stator core 31, the busbar 40 is positioned relatively close to the stator core 31. Along the axial direction of the stator core 31, the distance between the busbar 40 and the axial end face 313 is less than the length of the flat wire winding 32 extending beyond the axial end face 313. That is, along the radial direction of the stator core 31, the distance between the busbar 40 and the first axial end face 313a is less than the length of the first segment 321.

[0102] Bus 40 is used to receive drive current signals and to be electrically connected to the first segment 321 of the flat wire winding 32 to transmit drive current signals to the flat wire winding 32. The flat wire winding 32 generates an alternating magnetic field in response to the drive current signal to drive the motor rotor 20 to rotate, thereby realizing power output.

[0103] It should be noted that the relative positions of the busbar 40, the portion of the flat wire winding 32 exposed on the stator core 31, and the axial end face 313 of the stator core 31 in the above embodiments are only illustrative examples. In other embodiments, the busbar 40 and the second segment 322 of the flat wire winding 32 may be located on the same side of the stator core 31 along the axial direction of the stator core 31, and may be relatively close to the first axial end face 313a or relatively close to the second axial end face 313b. This application does not limit this. For ease of explanation, this application will subsequently use the example of the busbar 40 and the first segment 321 of the flat wire winding 32 being located on the same side of the stator core 31 along the axial direction of the stator core 31, and relatively close to the first axial end face 313a, for further explanation.

[0104] In one embodiment, bus 40 is also used for electrical connection with motor controller 400, through which motor controller 400 transmits drive current signal to motor stator 30.

[0105] In one embodiment, the stator core 31 is provided with an oil channel (not shown in the figure), in which cooling oil flows. The cooling oil is used to cool and dissipate heat for the stator core 31 and for cooling and dissipating heat for the second section 322 of the flat wire winding 32 housed in the stator core 31.

[0106] The axial end face 313 of the stator core 31 includes a plurality of first oil supply holes 314, which are distributed circumferentially on the axial end face 313 of the stator core 31. That is, the plurality of first oil supply holes 314 are distributed circumferentially on the first axial end face 313a of the stator core 31. Each first oil supply hole 314 is used to output cooling oil to at least one portion of the flat wire winding 32 exposed on the axial end face 313 or to the busbar 40. Specifically, each first oil supply hole 314 is used to output cooling oil to the first section 321 of the flat wire winding 32 and / or the busbar 40 to achieve cooling and heat dissipation of the first section 321 of the flat wire winding 32 and / or the busbar 40.

[0107] In one embodiment, the first oil outlet 314 is used to communicate with the oil passages inside the stator core 31. Cooling oil in the oil passages can be sprayed from the first oil outlet 314 onto the first section 321 of the flat wire winding 32 and / or the busbar 40. That is, the motor stator 30 outputs cooling oil from the oil passages inside the stator core 31 towards the first section 321 of the flat wire winding 32 and / or the busbar 40 through the first oil outlet 314.

[0108] In this embodiment, the flat wire motor 100 outputs cooling oil to the first section 321 of the flat wire winding 32 and / or the busbar 40 through a first oil inlet 314 on the axial end face 313 of the stator core 31. By arranging the busbar 40 radially along the stator core 31 on the outside of the flat wire winding 32 and close to the stator core 31, the axial distance between the stator core 31 and the busbar 40 is shortened. Because the opening of the first oil inlet 314 is approximately the portion of the stator core 31 axially facing the busbar 40 and the flat wire winding 32 exposed on the axial end face 313, the cooling oil output from the first oil inlet 314 can reach the busbar 40 more after being reflected by the flat wire winding 32, or reach the flat wire winding 32 more after being reflected by the busbar 40, thereby improving the heat dissipation effect on the busbar 40 and the flat wire winding 32, and improving the power performance and service life of the flat wire motor 100 provided in this application.

[0109] Furthermore, the flat wire motor 100 provided in this application also makes reasonable use of the space outside the flat wire winding 32 by arranging the busbar 40 radially along the stator core 31 on the outside of the flat wire winding 32, thereby compressing the length dimension of the flat wire motor 100 along the axial direction of the stator core 31, which is conducive to the miniaturization of the flat wire motor 100.

[0110] Please refer to the above. Figure 8 and Figure 9 ,in Figure 8 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 9 This is a partially exploded structural diagram of a flat wire motor 100 provided in one embodiment of this application.

[0111] In one embodiment, a plurality of first oil inlets 314 are arranged spirally along the circumference of the stator core 31. Along the radial direction of the stator core 31, the distance between the first oil inlet 314 at the starting point of the spiral and the flat wire winding 32 is smaller than the distance between the first oil inlet 314 at the ending point of the spiral and the flat wire winding 32, and larger than the outer circumferential radius of the flat wire winding 32. The plurality of first oil inlets 314 are spiraled around the central axis of the stator core 31. Along the radial direction of the stator core 31, each first oil inlet 314 is located on the outer side of the flat wire winding 32. For ease of explanation, the first oil inlet 314 at the starting point of the spiral is defined as the first-end oil inlet 314a, and the first oil inlet 314 at the ending point of the spiral is defined as the last-end oil inlet 314b. Along the radial direction of the stator core 31, the distance between the first oil outlet 314a and the central axis of the stator core 31 is greater than the distance between the flat wire winding 32 and the central axis of the stator core 31, and less than the distance between the last oil outlet 314b and the central axis of the stator core 31.

[0112] In this embodiment, by arranging a plurality of first oil outlet holes 314 in a spiral along the circumference of the stator core 31, the output range of the cooling oil in the plurality of first oil outlet holes 314 along the axial direction of the stator core 31 is different, so as to cool and dissipate heat at different positions of the flat wire winding 32 along the axial direction of the stator core 31, thereby improving the heat dissipation effect.

[0113] Please refer to the above. Figure 10 and Figure 11 ,in Figure 10 This is a partial cross-sectional structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 11 This is a partial cross-sectional enlarged structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0114] In one embodiment, each first oil inlet 314 extends spirally along the axial direction of the stator core 31. When cooling oil flows in the spirally extended first oil inlet 314, the tortuous flow path causes the cooling oil to rotate, thereby generating centrifugal force. Centrifugal force can increase the initial velocity of the cooling oil injection, thereby extending the injection distance of the cooling oil along the axial direction of the stator core 31, so as to ensure the cooling effect of the cooling oil on the busbar 40 and the flat wire winding 32.

[0115] In one embodiment, along the circumference of the stator core 31, the distance between the busbar 40 and the first oil outlet 314 located at the starting point of the spiral is less than the distance between the busbar 40 and the first oil outlet 314 located at the ending point of the spiral. That is, along the circumference of the stator core 31, the busbar 40 is positioned relatively close to the first oil outlet 314a. The first oil outlet 314a extends spirally along the axial direction of the stator core 31. Because the distance between the first oil outlet 314a and the central axis of the stator core 31 is short along the radial direction of the stator core 31, the radius of rotation of the cooling oil flowing in the first oil outlet 314a is small, and the cooling oil in the first oil outlet 314a can have a larger initial injection velocity and a larger flow rate. In this embodiment, by positioning the busbar 40 relatively close to the first oil outlet 314a, a better heat dissipation effect can be achieved for the busbar 40, thereby further improving the power performance and service life of the flat wire motor 100 provided in this application.

[0116] In one embodiment, along the axial direction of the stator core 31, from the middle section to the end of the stator core 31, the diameter of each first oil delivery hole 314 gradually decreases. Thus, the tangential velocity generated by the rotation of the cooling oil within each first oil delivery hole 314 can be converted into an initial axial velocity at the orifice of the first oil delivery hole 314, thereby further increasing the injection speed and flow rate of the cooling oil.

[0117] Please refer to the above. Figure 12 , Figure 12This is a partially exploded structural diagram of a flat wire motor 100 provided in one embodiment of this application.

[0118] In one embodiment, the stator core 31 includes a fourth segment 315 and a fifth segment 316 arranged along its own axial direction. Along the axial direction of the stator core 31, the fourth segment 315 is positioned relatively close to the first segment 321 of the flat wire winding 32. The axial end face 313 of the fourth segment 315 facing away from the fifth segment 316 along the axial direction of the stator core 31 is the first axial end face 313a of the stator core 31. The fourth segment 315 includes a plurality of laminations 3151, each lamination 3151 including a plurality of first oil supply holes 3152, the plurality of first oil supply holes 3152 being spirally arranged circumferentially on the laminations 3151. The plurality of laminations 3151 are overlapped along the axial direction of the stator core 31, such that the corresponding first oil supply holes 3152 between adjacent laminations 3151 are spirally stacked. Even if the first oil supply holes 3152 corresponding to two adjacent laminations 3151 are connected and offset relative to each other along the circumference of the stator core 31, a spiral first oil supply hole 314 is formed.

[0119] In one embodiment, a plurality of second oil supply holes 317 are further provided on the axial end face 313 of the stator core 31. These second oil supply holes 317 are spaced apart circumferentially on the axial end face 313 of the stator core 31. The second oil supply holes 317 are used to supply cooling oil to the portion of the flat wire winding 32 exposed on the axial end face 313. That is, the plurality of second oil supply holes 317 are spaced apart circumferentially on the first axial end face 313a of the stator core 31. Each second oil supply hole 317 is used to supply cooling oil to the first section 321 of the flat wire winding 32.

[0120] Furthermore, along the radial direction of the stator core 31, the second oil supply hole 317 is arranged between the first oil supply hole 314 and the inner hole 311 of the stator core 31. That is, along the radial direction of the stator core 31, the second oil supply hole 317 is closer to the central axis of the stator core 31 than the first oil supply hole 314. Along the circumferential direction of the stator core 31, each second oil supply hole 317 is located between two adjacent stator slots 312. That is, the second oil supply holes 317 and the stator slots 312 are arranged alternately along the circumferential direction of the stator core 31.

[0121] In this embodiment, since the radial dimension of the flat wire winding 32 along the stator core 31 is relatively large, a second oil outlet 317 is provided between two adjacent stator slots 312 to output cooling oil to the first section 321 of the flat wire winding 32. The first oil outlet 314 and the second oil outlet 317 work together to output cooling oil to the busbar 40 and the first section 321 of the flat wire winding 32 to achieve cooling and heat dissipation, thereby improving the heat dissipation effect of the flat wire motor 100.

[0122] Please refer to the above. Figures 13 to 16,in Figure 13 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 14 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 15 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 16 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0123] In one embodiment, M adjacent stator slots 312 form a stator slot group 312a along the circumference of the stator core 31. Multiple stator slot groups 312a are evenly arranged along the circumference of the stator core 31. Figure 14 In the diagram, the number of stator slots 312 is 54. Three adjacent stator slots 312 are grouped into a stator slot group 312a, i.e., M=3. Then, in... Figure 14 In the illustrated embodiment, 18 stator slot groups 312a are formed. Each stator slot 312 includes N slots 3121 arranged radially along the stator core 31. The stator slots 312 are spaced apart circumferentially along the stator core 31. In the multiple stator slots 312, slots 3121 spaced equidistant from the central axis of the stator core 31 along its radial direction enclose a slot layer 3121a. Thus, the N corresponding slots 3121 in the multiple stator slots 312 enclose N sequentially surrounding slot layers 3121a, with each stator slot 312 including a portion of each of the N slot layers 3121a. Figure 15 In the schematic diagram, each stator slot 312 contains 8 slots 3121, i.e., N = 8.

[0124] The flat wire winding 32 includes multi-phase windings 32a, with different phases between each phase winding 32a. For example, there are three phase windings 32a, which can be defined as U-phase winding 324, V-phase winding 325, and W-phase winding 326, respectively. Each phase winding 32a is used to respond to one phase of alternating current in the drive current signal; that is, each phase winding 32a receives one phase of alternating current and generates a magnetic field. The multi-phase windings 32a work together to create an alternating magnetic field in the motor stator 30. Specifically, the flat wire windings 32 are wound around the stator core 31 by the multi-phase windings 32a alternately and sequentially wound around different stator slot groups 312a along the circumference of the stator core 31. Each stator slot group 312a is used only for winding the phase winding 32a of the same phase, that is, the flat wire winding 32 in each stator slot 312 of each stator slot group 312a is either the U-phase winding 324, the V-phase winding 325, or the W-phase winding 326.

[0125] It should be noted that the number of stator slots 312, the number of stator slots 312 in each stator slot group 312a, the number of wire slots 3121 in each stator slot 312, and the number of phase windings 32a in the above embodiments are all exemplary descriptions, and this application does not impose any particular limitations on them. For ease of description, this application will subsequently use 54 stator slots 312, each stator slot group 312a including 3 stator slots 312, each stator slot 312 including 8 wire slots 3121, and the flat wire winding 32 including 3 phase windings 32a as examples for further description.

[0126] Please refer to the above. Figure 17 and Figure 18 ,in Figure 17 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 18 This is a partial structural schematic diagram of a flat wire motor 100 provided in one embodiment of this application. Figure 18 The diagram above illustrates the structure of one phase winding 32a in the multiphase winding 32a, using the U-phase winding 324.

[0127] The U-phase winding 324 is wound circumferentially around the stator core 31 in six different stator slot groups 312a. These six stator slot groups 312a are evenly distributed circumferentially around the stator core 31, with equal distances between any two stator slot groups 312a. For any one stator slot group 312a in the stator core 31 of this application, it is used only to wind one phase winding 32a, and the phase windings 32a wound on three adjacent stator slots 312a have the same phase.

[0128] When there are three phase windings 32a, the three phase windings 32a are alternately wound in different stator slot groups 312a along the circumference of the stator core 31. Since each stator slot group 312a is only used to wind phase windings 32a of the same phase, between two adjacent stator slot groups 312a with phase windings 32a of the same phase, there are two stator slot groups 312a with phase windings 32a of different phases respectively.

[0129] Please refer to the above. Figure 19 , Figure 19 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application. Figure 18 The diagram illustrates the structure of one branch 33 in each phase winding 32a.

[0130] Each phase winding 32a includes multiple branches 33. Each branch 33 of the same phase is sequentially wound into different stator slot groups 312a along with the phase winding 32a, and the branches 33 are interconnected to form a phase winding 32a. In one embodiment, the number of branches 33 is two, and the two branches 33 are sequentially wound into six different stator slot groups 312a along with a phase winding 32a.

[0131] Each branch 33 includes two solder feet 331 and multiple flat conductors 332. Each flat conductor 332 is U-shaped, and the multiple flat conductors 332 are connected in series between the two solder feet 331. The two solder feet 331 are also used to connect to the busbar 40, thereby forming a closed loop.

[0132] Please refer to the above. Figure 20 and Figure 21 , Figure 20 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 21 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0133] Each flat conductor includes two straight segments 3321 and a bent segment 3322 connecting the two straight segments 3321. The two straight segments 3321 are approximately parallel along the axial direction of the stator core 31. Each straight segment 3321 of each flat conductor 332 is inserted into a slot 3121, and the slots 3121 into which the two straight segments 3321 of each flat conductor 332 are inserted are in different stator slot groups 312a. The bent segment 3322 spans between the two straight segments 3321 to achieve electrical conduction between the two straight segments 3321. Along the axial direction of the stator core 31, each straight segment 3321 extends a support leg 3323 on the side away from the bent segment 3322. Two adjacent flat conductors 332 can be connected in series by welding the closest support legs 3323.

[0134] In one embodiment, the two solder feet 331 of each branch 33 are respectively connected to the straight segments 3321 at the beginning and end of a plurality of flat wire conductors 332 connected in series, so as to realize the conduction of the branch 33.

[0135] Corresponding to the embodiment of the flat wire winding 32 including a first section 321, a second section 322 and a third section 323 along the axial direction of the stator core 31, the bent section 3322 is located in the third section 323 of the flat wire winding 32, and the support leg 3323 and the welding leg 331 are located in the first section 321 of the flat wire winding 32.

[0136] Please refer to the above. Figure 22 , Figure 22 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0137] In one embodiment, the flat wire winding 32 includes a plurality of flat wire conductors 332, which are inserted into a plurality of stator slots 312, are connected according to a certain rule to form a plurality of phase windings 32a, and are connected with a plurality of solder feet 331 according to a certain rule to form a plurality of branches 33.

[0138] In one embodiment, each stator slot 312 is used to fix N layers of flat wire conductors 332 along the radial direction of the stator core 31.

[0139] The flat wire winding 32 includes N layers of flat wire conductors 332 arranged radially along the stator core 31, and the N layers of flat wire conductors 332 are sequentially wound around the stator core 31 circumferentially. Each layer of flat wire conductors 332 includes multiple flat wire conductors 332 arranged at intervals along the circumferential direction of the stator core 31. The flat wire winding 32 passes through the stator slots 312 along the axial direction of the stator core 31, specifically, the flat wire conductors 332 pass through the slots 3121 along the axial direction of the stator core 31. Each layer of flat wire conductors 332 passes through one slot layer 3121a along the axial direction of the stator core 31, and each flat wire conductor 332 passes through one slot 3121 along the axial direction of the stator core 31.

[0140] Along the radial direction of the stator core 31, the slot layer 3121a with the largest distance from the central axis of the stator core 31 is the bottom slot layer 3122, and the slot layer 3121a with the smallest distance from the central axis of the stator core 31 is the top slot layer 3123. That is, the top slot layer 3123 is the innermost layer among the N sequentially surrounding slot layers 3121a, and the bottom slot layer 3122 is the outermost layer among the N sequentially surrounding slot layers 3121a. The slot layer 3121a between the top slot layer 3123 and the bottom slot layer 3122 is the intermediate layer.

[0141] For ease of explanation, the two solder feet 331 of the same branch 33 are defined as the first solder foot 3311 and the second solder foot 3312, respectively. The first solder foot 3311 of the same branch 33 is used to connect to one of the straight segments 3321 of the flat conductors 332 located in the bottom layer 3122 of the slot, and is used to connect to the busbar 40. That is, the first solder foot 3311 of the same branch 33 is located in the bottom layer 3122 of the slot. The second solder foot 3312 of the same branch 33 is used to connect to one of the straight segments 3321 of the flat conductors 332 located in the slot opening layer 3123, and is used to connect to the busbar 40. That is, the second solder foot 3312 of the same branch 33 is located in the slot opening layer 3123.

[0142] In this embodiment, the first solder foot 3311 and the second solder foot 3312 are respectively disposed on the bottom layer 3122 and the opening layer 3123 of the slot. This facilitates the mutual conduction of the flat wire conductors 332 located between the opening layer 3123 and the bottom layer 3122 of the slot to transmit the drive current signal. It can simplify the bending shape of each flat wire conductor 332 in the flat wire winding 32 and facilitate the busbar 40 located outside the flat wire winding 32 to conduct with multiple flat wire conductors 332 through the first solder foot 3311 and the second solder foot 3312.

[0143] In another description, the flat wire winding 32 includes a first flat wire conductor 3324 among the multiple flat wire conductors 332 located in the outermost layer of the stator slot 312, that is, the multiple flat wire conductors 332 located in the bottom layer of the slot 3122 include the first flat wire conductor 3324. The flat wire winding 32 also includes multiple second flat wire conductors 3325 among the multiple flat wire conductors 332 located in the slot opening layer 3123. For a branch 33 of a phase winding 32a, the first flat wire conductor 3324 is one of the multiple flat wire conductors 332 located in the bottom layer of the slot 3122; the second flat wire conductor 3325 is one of the multiple flat wire conductors 332 located in the slot opening layer 3123. The multiple first flat wire conductors 3324 and the multiple second flat wire conductors 3325 are respectively used to connect with the busbar 40.

[0144] In this embodiment, the flat wire winding 32 is connected to the busbar 40 through the outermost and innermost flat wire conductors 332, respectively. This facilitates the interconnection between the flat wire conductors 332 in the middle layer to transmit the drive current signal, simplifies the bending shape of each flat wire conductor 332 in the flat wire winding 32, and facilitates the interconnection between the outer busbar 40 and multiple flat wire conductors 332.

[0145] In one embodiment, the flat wire winding 32 includes a multi-phase winding 32a, each phase winding 32a including multiple branches 33, each branch 33 including multiple flat wire conductors 332 connected in series, each branch 33 including a first flat wire conductor 3324 and a second flat wire conductor 3325. Each first flat wire conductor 3324 and each second flat wire conductor 3325 are connected to a corresponding solder pad 331 to achieve connection with the busbar 40. Corresponding to an embodiment where the flat wire winding 32 includes a three-phase winding 32a, each phase winding 32a including two branches 33, each phase winding 32a including four solder pads 331, and each flat wire winding 32 including six solder pads 331.

[0146] In this embodiment, multiple flat wire conductors 332 of the same branch 33 are sequentially connected along the radial direction of the stator core 31, and are connected to the busbar 40 through the outermost first flat wire conductor 3324 and the innermost second flat wire conductor 3325, which facilitates the assembly of the flat wire motor 100 provided in this application.

[0147] In one embodiment, the number of flat wire conductors 332 sequentially conducted in each branch 33 of the same phase winding 32a is equal. Therefore, along the circumference of the stator core 31, the included angles between the first flat wire conductor 3324 and the second flat wire conductor 3325 in each branch 33 of each phase winding 32a are equal, and the spans of the first flat wire conductor 3324 and the second flat wire conductor 3325 in each branch 33 on the busbar 40 are equal. This reduces the difference in transmission loss of AC current in each phase of the drive current signal and improves the response accuracy of the flat wire motor 100 to the drive current signal.

[0148] Please refer to the above. Figure 23 and Figure 24 ,in Figure 23 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 24 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0149] In one embodiment, the first flat conductor 3324 includes a first bent section 3326, which extends radially toward the busbar 40 along the stator core 31 and is in communication with the busbar 40. Along the axial direction of the stator core 31, the distance between the first bent section 3326 and the first axial end face 313a is less than the length of the remaining flat conductors 332 in the flat wire winding 32 extending beyond the first axial end face 313a.

[0150] Specifically, the first bent section 3326 is used to connect with a straight section 3321 of the first flat conductor 3324, and is used to bend and extend from the end of the straight section 3321 of the first flat conductor 3324 radially toward the outside of the stator slot 312, thereby forming a first weld leg 3311. The first flat conductor 3324 is connected to the busbar 40 through the first bent section 3326.

[0151] In this embodiment, the first flat wire conductor 3324 is located at the outermost layer of the stator slot 312, i.e., at the bottom layer 3122 of the slot. Therefore, along the radial direction of the stator core 31, the first flat wire conductor 3324 is arranged adjacent to the busbar 40, allowing the first flat wire conductor 3324 to bend and extend towards the busbar 40 relatively close to the stator core 31. This results in a smaller distance between the stator core 31 and the busbar 40 along its own axial direction. Consequently, the distance between the first axial end face 313a and the busbar 40 can be set to be smaller, thus ensuring the miniaturization of the flat wire motor 100 while also ensuring the cooling effect of the cooling oil output from the first oil outlet 314 on the busbar 40.

[0152] In one embodiment, the first bent section 3326 is attached to the side of the busbar 40 facing the first axial end face 313a. Specifically, the busbar 40 includes a first side surface 41, which is disposed opposite to the first axial end face 313a along the axial direction of the stator core 31. The first bent section 3326 includes an upper surface 3328, which is disposed opposite to the first axial end face 313a along the axial direction of the stator core 31. The upper surface 3328 is used to attach to the first side surface 41 to achieve conductivity between the first flat conductor 3324 and the busbar 40.

[0153] In this embodiment, along the axial direction of the stator core 31, the first bent section 3326 is located between the busbar 40 and the stator core 31. The first bent section 3326 is attached to the busbar 40 from the first side 41 of the busbar 40, which helps to compress the axial dimension of the busbar 40 and improve the heat dissipation effect of the busbar 40.

[0154] Please refer to the above. Figure 25 , Figure 25 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0155] In one embodiment, the second flat conductor 3325 includes a second bend 3327, which extends radially toward the busbar 40 along the stator core 31 and is in communication with the busbar 40. Along the axial direction of the stator core 31, the distance between the second bend 3327 and the first axial end face 313a is greater than the length of the remaining flat conductors 332 in the flat wire winding 32 extending beyond the first axial end face 313a.

[0156] The second bent section 3327 is used to connect to a straight section 3321 of the second flat conductor 3325, and is used to bend and extend from the end of the straight section 3321 of the second flat conductor 3325 radially toward the outside of the stator slot 312, thereby forming a second weld leg 3312. The second flat conductor 3325 is connected to the busbar 40 through the second bent section 3327.

[0157] In this embodiment, the second flat conductor 3325 is located in the innermost layer of the stator slot 312, i.e., in the slot opening layer 3123. Along the radial direction of the stator core 31, the slot opening layer 3123 and the busbar 40 also include multiple layers of flat conductors 332. This application sets the second bending segment 3327 along the axial direction of the stator core 31, with a distance greater than the length of the remaining flat conductors 332 in the flat wire winding 32 extending beyond the first axial end face 313a. This causes the second bending segment 3327 to bend and extend towards the busbar 40 at a position relatively far from the stator core 31, allowing the second flat conductor 3325 to achieve conductivity with the busbar 40 by crossing the multiple layers of flat conductors 332 through the second bending segment 3327.

[0158] In one embodiment, the second bent section 3327 is attached to the side of the busbar 40 opposite to the first axial end face 313a. That is, the busbar 40 includes a second side face 42, which is disposed opposite to the first axial end face 313a along the axial direction of the stator core 31. The second bent section 3327 includes a lower surface 3329, which is disposed opposite to the first axial end face 313a along the axial direction of the stator core 31. The lower surface 3329 is used to attach to the second side face 42 to achieve the conductivity effect between the second flat conductor 3325 and the busbar 40.

[0159] In this embodiment, along the axial direction of the stator core 31, the second bent section 3327 is located on the side of the busbar 40 away from the stator core 31. The second bent section 3327 is attached to the busbar 40 from the second side 42 of the busbar 40, which helps to compress the axial dimension of the busbar 40 and improve the heat dissipation effect of the busbar 40.

[0160] In one embodiment, along the axial direction of the stator core 31, a first bent segment 3326 and a second bent segment 3327 are arranged on opposite sides of the busbar 40. This results in a larger axial distance between the first bent segment 3326 and the second bent segment 3327, preventing mutual interference between the drive current signals transmitted by the first bent segment 3326 and the second bent segment 3327.

[0161] In one embodiment, the second bent segment 3327 is spaced apart from the remaining flat wire conductors 332 along the axial direction of the stator core 31. That is, along the axial direction of the stator core 31, the second bent segment 3327 is located on the side of the remaining flat wire conductors 332 facing away from the first axial end face 313a, and is spaced apart from the remaining flat wire conductors 332. In this embodiment, by arranging the second bent segment 3327 spaced apart along the axial direction of the stator core 31 on the outside of the remaining flat wire conductors 332, overlapping and conducting between the second bent segment 3327 and the remaining flat wire conductors 332 can be avoided, thus ensuring reliable operation of the flat wire winding 32.

[0162] In one embodiment, the first flat conductor 3324 and the second flat conductor 3325 of the same branch 33 are inserted into different stator slots 312. The first flat conductor 3324 and the second flat conductor 3325 of the same branch 33 are used to bend parallel to the radial direction of the stator core 31 and respectively connect to the busbar 40.

[0163] In this embodiment, the first flat conductor 3324 and the second flat conductor 3325 of the same branch 33 are inserted into different stator slots 312. This facilitates the regular winding of multiple flat conductors 332 and allows the remaining flat conductors 332 between the first flat conductor 3324 and the second flat conductor 3325 of the same branch 33 to be connected in series via the support feet 3323. It also prevents multiple flat conductors 332 from contacting and becoming conductive between different branches 33.

[0164] Furthermore, by bending the first flat conductor 3324 and the second flat conductor 3325 of the same branch 33 parallel to the radial direction of the stator core 31, a pair of parallel extending first bent segments 3326 and second bent segments 3327 are formed. That is, setting the first bent segment 3326 and the second bent segment 3327 parallel helps to simplify the bending shape of the flat wire winding 32 and makes the various bent segments 3322 more compactly arranged along the circumference of the stator core 31.

[0165] In one embodiment, the first flat wire conductors 3324 and the second flat wire conductors 3325 are distributed in different stator slots 312. This facilitates the regular winding of the flat wire conductors 332 between the branches 33 and facilitates the assembly of the flat wire motor 100.

[0166] Please refer to the above. Figure 26 , Figure 26 This is a partially exploded structural diagram of a flat wire motor 100 provided in one embodiment of this application.

[0167] In one embodiment, bus 40 includes a neutral point bus 43 and single-phase bus 44. There is one neutral point bus 43 and multiple single-phase bus 44. Along the radial direction of the stator core 31, multiple single-phase bus 44 are arranged between the neutral point bus 43 and the flat wire winding 32. That is, multiple single-phase bus 44 surround the outside of the neutral point bus 43. Along the circumferential direction of the stator core 31, multiple single-phase bus 44 are arranged sequentially at intervals. The neutral point bus 40 and multiple single-phase bus 40 are respectively used to conduct electricity with the flat wire winding 32. In one embodiment, the neutral point bus 43 is used to conduct electricity with each phase winding 32a of the flat wire winding 32. That is, one neutral bus 40 is simultaneously connected to multiple phase windings 32a. For example, the second flat conductor 3325 of one branch 33 of the U-phase winding 324 is connected to the neutral bus 43, and the first flat conductor 3324 of the other branch 33 is connected to the neutral bus 43. In one embodiment, each single-phase bus 44 is connected to each phase winding 32a of the flat wire winding 32. That is, each single-phase bus 44 is connected to one phase winding 32a. For example, the first flat conductor 3324 of one branch 33 of the U-phase winding 324 is connected to one single-phase bus 44, and the second flat conductor 3325 of the other branch 33 is connected to the single-phase bus 44. Each single-phase bus 44 is used to transmit one phase of AC current in the drive current signal to one phase winding 32a. The neutral bus 40 is used to provide a uniform zero position for each phase winding 32a, thereby improving the response accuracy of the flat wire motor 100 provided in this application to the drive current signal.

[0168] In this embodiment of the application, by arranging the neutral point bus 40 and multiple single-phase bus 40 at radial intervals along the stator core 31, the cooling oil output from the first oil outlet 314 can reach the neutral point bus 40 and multiple single-phase bus 40 without obstruction, thereby improving the overall heat dissipation effect of the cooling oil on the bus 40.

[0169] Please refer to the above. Figure 27 , Figure 27 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0170] In one embodiment, the neutral point bus 43 includes a first arc segment 431 and a second arc segment 432. There are multiple first arc segments 431 and multiple second arc segments 432. Along the circumference of the stator core 31, the multiple first arc segments 431 and multiple second arc segments 432 are arranged alternately and sequentially connected. That is, along the circumference of the stator core 31, a first arc segment 431 is provided between two adjacent second arc segments 432, and a second arc segment 432 is provided between two adjacent first arc segments 431. The first arc segment 431 and the second arc segment 432 are connected. For example, a first arc segment 431 is connected to an adjacent second arc segment 432, and this second arc segment 432 is also connected to another adjacent first arc segment 431.

[0171] Along the axial direction of the stator core 31, a plurality of first arc segments 431 are located between the first axial end face 313a and a plurality of second arc segments 432. That is, along the axial direction of the stator core 31, the distance between the first arc segment 431 and the first axial end face 313a is smaller than the distance between the second arc segment 432 and the first axial end face 313a. Alternatively, it can be understood that along the axial direction of the stator core 31, the second arc segment 432 is located on the side of the first arc segment 431 that is away from the first axial end face 313a.

[0172] Each first arc segment 431 and each second arc segment 432 are respectively used to conduct to at least one flat wire conductor 332 in the flat wire winding 32. In one embodiment, each first arc segment 431 is respectively used to conduct to at least one first flat wire conductor 3324 in the flat wire winding 32, and each second arc segment 432 is respectively used to conduct to at least one second flat wire conductor 3325 in the flat wire winding 32.

[0173] In this embodiment, the neutral point busbar 43, arranged along the axial direction of the stator core 31, includes two types of arc segments with different distances from the first axial end face 313a. These two types of arc segments are alternately arranged circumferentially along the stator core 31, facilitating contact and conduction between the neutral point busbar 43 and multiple first flat conductors 3324 and multiple second flat conductors 3325. Along the axial direction of the stator core 31, the multiple first arc segments 431 are closer to the first axial end face 313a, resulting in better heat dissipation from the first oil outlet 314 to the first arc segments 431. The circumferential spacing of the first arc segments 431 along the stator core 31 allows for more uniform overall heat dissipation from the first oil outlet 314 to the neutral point busbar 43, and also provides better heat dissipation for the alternately arranged second arc segments 432.

[0174] Please refer to the above. Figure 28 and Figure 29 ,in Figure 28 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application; Figure 29 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0175] In one embodiment, each single-phase busbar 44 includes an axial segment 443 and two arc segments. For ease of explanation, the two arc segments of each single-phase busbar 44 are defined as a third arc segment 441 and a fourth arc segment 442, respectively. Along the axial direction of the stator core 31, the opposite ends of the axial segment 443 are used to connect the third arc segment 441 and the fourth arc segment 442, respectively. That is, along the axial direction of the stator, the distances between the third arc segment 441 and the fourth arc segment 442 and the first axial end face 313a are different. In one embodiment, the distance between the third arc segment 441 and the first axial end face 313a is less than the distance between the fourth arc segment 442 and the first axial end face 313a. Alternatively, it can be understood that, along the axial direction of the stator core 31, the fourth arc segment 442 is located on the side of the third arc segment 441 facing away from the first axial end face 313a.

[0176] Along the circumference of the stator core 31, a first arc segment 431 and a second arc segment 432 are respectively arranged on both sides of the axial section 443. A third arc segment 441 and a fourth arc segment 442 are respectively used to conduct at least one flat wire conductor 332 in the flat wire winding 32. In one embodiment, in the same single-phase busbar 44, the third arc segment 441 is used to conduct with the first flat wire conductor 3324 in one branch 33 of a phase winding 32a, and the fourth arc segment 442 is used to conduct with the second flat wire conductor 3325 in another branch 33 of the same phase winding 32a. Thus, each single-phase busbar 44 conducts with both branches 33 of the same phase winding 32a through the third arc segment 441 and the fourth arc segment 442.

[0177] In this embodiment, along the axial direction of the stator core 31, each single-phase busbar 44 is configured to connect two branches 33 in the same phase winding 32a via two arc segments with different spacing from the first axial end face 313a. One branch 33 is connected to the single-phase busbar 44 via a first flat conductor 3324, and the other branch 33 is connected to the single-phase busbar 44 via a second flat conductor 3325. The third arc segment 441 is positioned closer to the axial end face 313 along the axial direction of the stator core 31, which improves the heat dissipation effect of the first oil outlet 314 on each single-phase busbar 44.

[0178] In one embodiment, each single-phase busbar 44 includes two welded sections. Each welded section is connected to an axial section 443 by an arc segment, and each welded section is used to extend radially toward the neutral point busbar 43 along the stator core 31. Each welded section is used to engage with one flat conductor 332 in the flat wire winding 32.

[0179] For ease of explanation, the two welded sections of each single-phase busbar 44 are defined as the first welded section 444 and the second welded section 445, respectively. In one embodiment, the first welded section 444 and the second welded section 445 are respectively located at both ends of the single-phase busbar 44 along the circumference of the stator core 31. The first welded section 444 is connected to the axial section 443 by a third arc section 441, and the second welded section 445 is connected to the axial section 443 by a fourth arc section 442. The first welded section 444 and the second welded section 445 extend radially from the single-phase busbar 44 toward the neutral point busbar 43 along the stator core 31, that is, the first welded section 444 and the second welded section 445 extend radially toward the outside of the single-phase busbar 44 along the stator core 31. The first welding section 444 is used to fit with the first bent section 3326 of the first flat conductor 3324 in the flat wire winding 32, and the second welding section 445 is used to fit with the second bent section 3327 of the second flat conductor 3325 in the flat wire winding 32.

[0180] In this embodiment, the radial width of the single-phase busbar 44 is limited because the arc segment of the single-phase busbar 44 is arranged between the neutral point busbar 43 and the flat wire winding 32 along the radial direction of the stator core 31. This application increases the contact area between the single-phase busbar 44 and the first bending segment 3326 and the second bending segment 3327 of the first flat wire conductor 3324 and the second flat wire conductor 3325 by having two welding segments respectively bonded to them, thus ensuring reliable conduction between the single-phase busbar 44 and the first flat wire conductor 3324 and the second flat wire conductor 3325.

[0181] In one embodiment, the width of the neutral point bus 43 is greater than the width of the single-phase bus 44 along the radial direction of the stator core 31. This increases the contact area between the neutral point bus 43 and the first flat conductor 3324 and the second flat conductor 3325, ensuring reliable conduction between the neutral point bus 43 and the first flat conductor 3324 and the second flat conductor 3325, respectively.

[0182] In one embodiment, one of the two arc segments of each single-phase busbar 44 is aligned flush with the axial direction of the stator core 31. That is, the third arc segment 441 of each single-phase busbar 44 is aligned flush with the axial direction of the stator core 31. Alternatively, it can be understood that the distance between the third arc segment 441 of each single-phase busbar 44 and the first axial end face 313a is equal along the axial direction of the stator core 31. The other arc segment of each single-phase busbar 44 is also aligned flush with the axial direction of the stator core 31. That is, the fourth arc segment 442 of each single-phase busbar 44 is aligned flush with the axial direction of the stator core 31. Alternatively, it can be understood that the distance between the fourth arc segment 442 of each single-phase busbar 44 and the first axial end face 313a is equal along the axial direction of the stator core 31.

[0183] In this embodiment, the third arc segment 441 of each single-phase busbar 44 is aligned, and the fourth arc segment 442 of each single-phase busbar 44 is aligned. The first bending segment 3326 and the second bending segment 3327 used to conduct with the single-phase busbar 44 can also be aligned sequentially along the axial direction of the stator core 31, thereby simplifying the bending shape of each flat wire conductor 332 in the flat wire winding 32.

[0184] In one embodiment, an arc segment of one single-phase busbar 44 and another arc segment of the other single-phase busbar 44 are at least partially stacked and spaced apart along the axial direction of the stator core 31. Specifically, along the axial direction of the stator core 31, in two adjacent single-phase busbars 44, a third arc segment 441 of one single-phase busbar 44 and a fourth arc segment 442 of the other single-phase busbar 44 are at least partially stacked and spaced apart. This results in a more compact arrangement of the single-phase busbars 44 along the circumference of the stator core 31, shortening the circumferential length of the busbars 40.

[0185] In one embodiment, each single-phase busbar 44 has the same shape. This reduces the manufacturing cost of the flat wire motor 100 provided in this application and improves assembly convenience.

[0186] In one embodiment, along the axial direction of the stator core 31, the neutral point busbar 43 includes two opposing sides, located on either side of each single-phase busbar 44. For ease of explanation, the two opposing sides of the neutral point busbar 43 are defined as the third side 433 and the fourth side 434, respectively. The distance between the third side 433 and the first axial end face 313a is less than the distance between the fourth side 434 and the first axial end face 313a. That is, along the axial direction of the stator core 31, the third side 433 is located between the fourth side 434 and the first axial end face 313a. Along the axial direction of the stator core 31, the third side 433 and the fourth side 434 are respectively arranged on both sides of the single-phase busbar 44. That is, along the axial direction of the stator core 31, the distance between the third side surface 433 and the first axial end face 313a is less than the minimum distance between the single-phase busbar 44 and the first axial end face 313a, and the distance between the fourth side surface 434 and the second axial end face 313b is greater than the maximum distance between the single-phase busbar 44 and the first axial end face 313a. The third side surface 433 is used to communicate with the upper surface 3328 of the first bent section 3326 of the first flat conductor 3324, and the fourth side surface 434 is used to communicate with the lower surface 3329 of the second bent section 3327 of the second flat conductor 3325.

[0187] In this embodiment, since the neutral point busbar 43 is arranged on the outside of each single-phase busbar 44 along the radial direction of the stator core 31, each of the first bend segments 3326 and the second bend segments 3327 used to communicate with the neutral point busbar 43 needs to cross the single-phase busbar 44 along the radial direction of the stator core 31. This application avoids short circuits between the first bend segments 3326 and the second bend segments 3327 used to communicate with the neutral point busbar 43 and the single-phase busbar 44 by setting the two opposite sides of the neutral point busbar 43 to extend out of the single-phase busbar 44 along the axial direction of the stator core 31.

[0188] In one embodiment, each single-phase bus 44 includes a solder pad 446 for connection with the copper busbars of the motor controller 400. The solder pad 446 is also used to transmit one phase of alternating current in the drive current signal. The single-phase bus 44 is connected to each copper busbar of the motor controller 400 via the solder pad 446, which facilitates the single-phase bus 44 receiving one phase of alternating current in the drive current signal.

[0189] Please refer to the above. Figure 30 , Figure 30 This is a partial structural schematic diagram of the flat wire motor 100 provided in one embodiment of this application.

[0190] In one embodiment, each welding seat 446 extends radially from the single-phase busbar 44 toward the neutral point busbar 43 along the stator core 31. That is, each welding seat 446 extends radially toward the outer side of the single-phase busbar 44. In this embodiment, the radial extension of each welding seat 446 along the stator core 31 ensures the conductivity between the single-phase busbar 44 and the copper busbar of the motor controller 400, while also shortening the axial dimension of the busbar 40, which is beneficial for miniaturization of the flat wire motor 100 provided in this application.

[0191] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the scope of protection of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A flat wire motor, characterized in that, The flat wire motor includes a stator core, flat wire windings, and a busbar. The inner circumferential surface of the stator core includes multiple stator slots, and the axial end face of the stator core includes multiple first oil supply holes. The multiple stator slots are used to fix the flat wire windings, and the busbar is used to electrically connect the flat wire windings. The plurality of first oil outlet holes are distributed circumferentially on the axial end face of the stator core of the flat wire motor. The busbars are arranged radially on the outside of the portion of the flat wire winding exposed on the axial end face. The distance between the busbars and the axial end face is less than the length of the flat wire winding extending out of the axial end face. Each first oil outlet hole is used to output cooling oil to the portion of the flat wire winding exposed on the axial end face or to at least one of the busbars.

2. The flat wire motor according to claim 1, characterized in that, The plurality of first oil supply holes are arranged spirally along the circumference of the stator core. The distance between the first oil supply hole at the starting point of the spiral and the flat wire winding is less than the distance between the first oil supply hole at the ending point of the spiral and the flat wire winding, but greater than the radius of the outer circumference of the flat wire winding. The distance between the busbar and the first oil supply hole at the starting point of the spiral along the circumference of the stator core is less than the distance between the busbar and the first oil supply hole at the ending point of the spiral.

3. The flat wire motor according to claim 1, characterized in that, The axial end face is also provided with a plurality of second oil supply holes, which are distributed at intervals along the circumference of the stator core on the axial end face. The second oil supply holes are used to output cooling oil toward the portion of the flat wire winding exposed on the axial end face, wherein: Along the radial direction of the stator core, the second oil inlet is arranged between the first oil inlet and the inner hole of the stator core; Along the circumference of the stator core, each of the second oil inlets is located between two adjacent stator slots.

4. The flat wire motor according to claim 1, characterized in that, Each stator slot along the radial direction of the stator core is used to fix N layers of flat wire conductors. Among the multiple flat wire conductors located in the outermost layer of the stator slot in the flat wire winding, there are multiple first flat wire conductors. Among the multiple flat wire conductors located in the innermost layer of the stator slot in the flat wire winding, there are multiple second flat wire conductors. The multiple first flat wire conductors and the multiple second flat wire conductors are respectively used to conduct to the busbar.

5. The flat wire motor according to claim 4, characterized in that, The flat wire winding includes a multi-phase winding, each phase of the winding includes multiple branches, each branch includes multiple flat wire conductors connected in series, and each branch includes a first flat wire conductor and a second flat wire conductor.

6. The flat wire motor according to claim 4, characterized in that, The first flat conductor includes a first bend, the first bend extending radially toward the busbar and communicating with the busbar, wherein: Along the axial direction of the stator core, the distance between the first bent section and the axial end face is less than the length of the remaining flat wire conductors in the flat wire winding extending out of the axial end face, and the first bent section is attached to the side of the busbar facing the axial end face.

7. The flat wire motor according to claim 4, characterized in that, The second flat conductor includes a second bend, the second bend extending radially toward the busbar and communicating with the busbar, wherein: Along the axial direction of the stator core, the distance between the second bent section and the axial end face is greater than the length of the remaining flat wire conductors in the flat wire winding extending out of the axial end face, and the second bent section is attached to the side of the busbar away from the axial end face.

8. The flat wire motor according to claim 5, characterized in that, The first flat conductor and the second flat conductor of the same branch are inserted into different stator slots. The first flat conductor and the second flat conductor of the same branch are used to bend parallel to the radial direction of the stator core and respectively communicate with the busbar.

9. The flat wire motor according to any one of claims 1-8, characterized in that, The busbar includes a neutral point busbar and multiple single-phase buses, wherein the neutral point busbar and the multiple single-phase buses are respectively connected to the flat wire winding, wherein: Along the radial direction of the stator core, the plurality of single-phase busbars are arranged between the neutral point busbar and the flat wire winding; Along the circumference of the stator core, a plurality of single-phase busbars are arranged sequentially at intervals.

10. The flat wire motor according to claim 9, characterized in that, The neutral point bus includes multiple first arc segments and multiple second arc segments. The multiple first arc segments and multiple second arc segments are alternately arranged and sequentially connected along the circumference of the stator core. Along the axial direction of the stator core, the multiple first arc segments are located between the axial end face and the multiple second arc segments. Each first arc segment and each second arc segment is respectively used to connect with at least one flat wire conductor in the flat wire winding.

11. The flat wire motor according to claim 9, characterized in that, Each single-phase busbar includes an axial section and two arc sections. The two opposite ends of the axial section along the axial direction of the stator core are respectively used to connect the two arc sections. The two arc sections are respectively arranged on both sides of the axial section along the circumference of the stator core. Each arc section is used to conduct at least one flat wire conductor in the flat wire winding.

12. The flat wire motor according to claim 11, characterized in that, Each of the single-phase busbars includes two welded sections, each welded section being connected to the axial section by an arc segment, each welded section being extended radially toward the neutral point busbar along the stator core, and each welded section being respectively used to engage with one of the flat conductors in the flat wire winding.

13. The flat wire motor according to claim 9, characterized in that, Each of the single-phase busbars includes a solder pad for connection to the busbar of the motor controller and for transmitting one phase of alternating current in the drive current signal, and each solder pad extends radially toward the neutral point busbar along the stator core.

14. A powertrain, characterized in that, The powertrain includes a motor controller and a flat wire motor as described in any one of claims 1-13, the motor controller being electrically connected to the flat wire motor, and the flat wire motor being configured to output driving force in response to a drive current signal transmitted by the motor controller.

15. A vehicle, characterized in that, The vehicle includes wheels and a powertrain as described in claim 14, the powertrain being used to drive the wheels to rotate.

Images