Flat wire motor, power assembly and electric vehicle

Abstract

The application provides a flat wire motor, a power assembly and an electric vehicle. The motor stator of the flat wire motor comprises a plurality of groups of winding slots. Each group of winding slots comprises a plurality of winding slots. All flat wires in a first winding slot in each group of winding slots are used for transmitting first-phase alternating current in three-phase alternating current. Flat wires in a second winding slot are used for transmitting first-phase or second-phase alternating current. The number of flat wires in the second winding slot for transmitting the first-phase alternating current is not equal to the difference between the number of flat wires in two adjacent second winding slots for transmitting the first-phase alternating current. Flat wires in a third winding slot are used for transmitting first-phase or third-phase alternating current. The number of flat wires in the third winding slot for transmitting the first-phase alternating current is not equal to the difference between the number of flat wires in two adjacent third winding slots for transmitting the first-phase alternating current. The connection of the cross-layer flat wires for transmitting the same-phase alternating current has different spans, the winding is continuous and short, the harmonic magnetic field of the motor is weakened, and the NVH performance of the motor is improved.

Description

Technical Field

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

[0002] Currently, the drive motors for new energy vehicles are mainly permanent magnet synchronous motors (PMSMs). In PMSMs, the cross-sectional shape of the stator windings can be divided into round wire conductors and flat copper wire conductors. Motors using flat copper wire conductors are called flat wire motors. Traditional round wire motors are limited by automatic unwinding processes, making it difficult to achieve three-phase balanced short-pitch windings. Flat wire motors, however, can effectively improve full-rate, power density, and torque density. With the rapid development of the new energy vehicle industry, the requirements for the number of layers, parallel branches, and winding forms of flat wire motors are becoming increasingly stringent. Currently, most existing flat wire motor stator windings are full-pitch windings. Full-pitch flat wire motors have high harmonic winding coefficients, resulting in large torque fluctuations during operation, which worsens the motor's noise, vibration, and acoustic roughness, thus reducing motor performance. By setting the stator windings to short-pitch windings, the harmonic winding coefficient of flat wire motors can be reduced, thereby improving the NVH performance of electric vehicles. However, existing flat wire short-pitch windings with balanced multi-branch circuits have complex structures, which makes winding processing difficult and winding difficult. Furthermore, the short-pitch setting method is limited by the winding form, making it difficult to effectively reduce the harmonic winding coefficient while obtaining a high fundamental winding coefficient, thus reducing the performance of the flat wire motor. Summary of the Invention

[0003] This application provides a flat wire motor, a powertrain, and an electric vehicle.

[0004] In a first aspect, this application provides a flat-wire motor for receiving three-phase alternating current (AC) power, including a first-phase AC, a second-phase AC, and a third-phase AC. The stator of the flat-wire motor includes multiple sets of winding slots. Each set of winding slots includes multiple winding slots arranged sequentially along the circumference of the flat-wire motor. Each winding slot is used to accommodate multiple flat wires. Multiple sequentially adjacent winding slots constitute a set of winding slots. Each set of winding slots includes: one first winding slot, multiple second winding slots, and multiple third winding slots. All the flat wires accommodated in a first winding slot are used to transmit the first-phase AC power in the three-phase AC. Multiple second winding slots are arranged along the circumference of the flat-wire motor on one side of a first winding slot. A portion of the flat wires in each second winding slot are used to transmit the first-phase AC power, and the remaining flat wires in each second winding slot are used to transmit the second-phase AC power. The number of flat wires used to transmit the first-phase AC power in any second winding slot is not equal to the difference in the number of flat wires used to transmit the first-phase AC power in two adjacent second winding slots. The number of multiple third winding slots is the same as the number of multiple second winding slots. The multiple third winding slots are arranged circumferentially along the other side of a first winding slot. A portion of the flat wires in each third winding slot are used to transmit the first phase AC current, and the remaining flat wires in each third winding slot are used to transmit the third phase AC current. The number of flat wires used to transmit the first phase AC current in any third winding slot is not equal to the difference between the number of flat wires used to transmit the first phase AC current in two adjacent third winding slots.

[0005] In this embodiment, multiple second winding slots are arranged circumferentially along one side of a first winding slot of the flat wire motor. A portion of the flat wires in each second winding slot are used to transmit the first phase AC current, and the remaining flat wires in each second winding slot are used to transmit the second phase AC current. This allows multiple flat wires in the multiple second winding slots to be used not only for transmitting the first phase AC current but also for transmitting the second phase AC current. Consequently, the connection of the flat wires in the winding slots can form a short-pitch winding, which helps to weaken the harmonic magnetic field of the flat wire motor and improve its NVH performance. The number of flat wires in any second winding slot used to transmit the first phase AC current is not equal to the difference in the number of flat wires used to transmit the first phase AC current in two adjacent second winding slots. This allows for more options in the arrangement of flat wires belonging to the same phase AC current in the winding slots, which helps to allow the connection between cross-layer flat wires to have different spans, enabling the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0006] In this embodiment, the number of the multiple third winding slots is the same as the number of the multiple second winding slots. The multiple third winding slots are arranged along the circumference of the flat wire motor on the other side of a first winding slot, making the arrangement of the flat wires of each phase in the winding slot more regular, the winding wiring more orderly, and the appearance more beautiful.

[0007] In this embodiment, a portion of the flat wires in each third winding slot are used to transmit the first phase AC current, while the remaining flat wires in each third winding slot are used to transmit the third phase AC current. This allows multiple flat wires in multiple third winding slots to transmit not only the first phase AC current but also the third phase AC current, enabling the connection of the flat wires within the winding slots to form a short-pitch winding. This helps to weaken the harmonic magnetic field of the flat wire motor and improve its NVH performance. The number of flat wires in any third winding slot used to transmit the first phase AC current is not equal to the difference in the number of flat wires used to transmit the first phase AC current in two adjacent third winding slots. This provides more options for the arrangement of flat wires belonging to the same phase AC current within the winding slots, allowing for connections between cross-layer flat wires with different spans. This enables the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0008] In one embodiment, the number of flat wires used for transmitting the first phase AC current in the plurality of second winding slots in each group of winding slots decreases in a counterclockwise direction. The number of flat wires used for transmitting the first phase AC current in the plurality of third winding slots in each group of winding slots increases in a counterclockwise direction.

[0009] In this embodiment, the number of flat wires used for transmitting the first phase AC current in the multiple second winding slots of each winding slot decreases in a counterclockwise direction, correspondingly increasing the number of flat wires used for transmitting the second phase AC current in the multiple second winding slots in a counterclockwise direction. This results in a more orderly arrangement of the winding wires used for transmitting the first and second phase AC currents, making the motor stator more aesthetically pleasing. It also facilitates the formation of continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0010] In this embodiment, the number of flat wires used for transmitting the first phase AC current in the multiple third winding slots of each winding slot increases counterclockwise, correspondingly reducing the number of flat wires used for transmitting the third phase AC current in the multiple third winding slots. This results in a more orderly arrangement of the winding wires used for transmitting the first and third phase AC currents, making the motor stator more aesthetically pleasing. It also facilitates the formation of continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0011] In one embodiment, the number of flat wires used for transmitting the first phase AC current in the plurality of second winding slots in each group of winding slots decreases by a greater amount in a counterclockwise direction than the number of flat wires used for transmitting the second phase AC current in a second winding slot adjacent to a first winding slot. Similarly, the number of flat wires used for transmitting the first phase AC current in the plurality of third winding slots in each group of winding slots increases by a greater amount in a counterclockwise direction than the number of flat wires used for transmitting the third phase AC current in a third winding slot adjacent to a first winding slot.

[0012] In the embodiments of this application, the number of flat wires used for transmitting the first phase AC current in the multiple second winding slots of each group of winding slots decreases by more in the counterclockwise direction than the number of flat wires used for transmitting the second phase AC current in a second winding slot adjacent to a first winding slot. This results in more cross-wire methods when the flat wires used for transmitting the first and second phase AC current in the second winding slots are connected to the flat wires in other groups of winding slots, which is beneficial for forming continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0013] In the embodiments of this application, the number of flat wires used for transmitting the first phase AC current in the multiple third winding slots in each group of winding slots increases in the counterclockwise direction by a greater number than the number of flat wires used for transmitting the third phase AC current in a third winding slot adjacent to a first winding slot. This results in more cross-wire methods when the flat wires used for transmitting the first and third phase AC current in the third winding slots are connected to the flat wires in other groups of winding slots, which is beneficial for forming continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0014] In one embodiment, the number of flat wires used for transmitting the first phase AC current in the plurality of second winding slots of each group of winding slots decreases by 2 in a counterclockwise direction, and the number of flat wires used for transmitting the first phase AC current in the plurality of third winding slots of each group of winding slots increases by 2 in a counterclockwise direction. Alternatively, the number of flat wires used for transmitting the first phase AC current in the plurality of second winding slots of each group of winding slots decreases by 3 in a counterclockwise direction, and the number of flat wires used for transmitting the first phase AC current in the plurality of third winding slots of each group of winding slots increases by 3 in a counterclockwise direction.

[0015] In this embodiment of the application, the number of flat wires used to transmit the first phase AC current in the multiple second winding slots of each group of winding slots is reduced by 2 in the counterclockwise direction, and the number of flat wires used to transmit the first phase AC current in the multiple third winding slots of each group of winding slots is increased by 2 in the counterclockwise direction. This makes the arrangement of the flat wires of the three-phase AC current in the winding slots more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing.

[0016] In this embodiment, the number of flat wires used for transmitting the first phase AC current in the multiple second winding slots of each group of winding slots decreases by 3 in the counterclockwise direction, and the number of flat wires used for transmitting the first phase AC current in the multiple third winding slots of each group of winding slots increases by 3 in the counterclockwise direction. This makes the arrangement of the flat wires of the three-phase AC current in the winding slots more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing.

[0017] In one embodiment, the flat wires for transmitting the first phase AC current in each second winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor, and the flat wires for transmitting the second phase AC current in each second winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor. The distance between any flat wire in each second winding slot for transmitting the first phase AC current and the axis of the flat wire motor is less than the distance between any flat wire in each second winding slot for transmitting the second phase AC current and the axis of the flat wire motor.

[0018] In the embodiments of this application, the flat wires used for transmitting the first phase AC power in each second winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor, and the flat wires used for transmitting the second phase AC power in each second winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor. This is beneficial for the relatively concentrated arrangement of the flat wires for transmitting the first phase AC power and the second phase AC power, and is beneficial for the arrangement of the phase belts inside the flat wire motor.

[0019] In this embodiment of the application, the distance between any flat wire used to transmit the first phase AC power in each second winding slot and the axis of the flat wire motor is less than the distance between any flat wire used to transmit the second phase AC power in each second winding slot and the axis of the flat wire motor. That is, the flat wire used to transmit the second phase AC power in each second winding slot is arranged closer to the bottom of the winding slot than the flat wire used to transmit the first phase AC power.

[0020] In one embodiment, the flat wires for transmitting the first phase AC current in each third winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor, and the flat wires for transmitting the third phase AC current in each third winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor. The distance between any flat wire for transmitting the first phase AC current in each third winding slot and the axis of the flat wire motor is greater than the distance between any flat wire for transmitting the third phase AC current in each third winding slot and the axis of the flat wire motor.

[0021] In the embodiments of this application, the flat wires used for transmitting the first phase AC power in each third winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor, and the flat wires used for transmitting the third phase AC power in each third winding slot are arranged sequentially adjacent to each other along the radial direction of the flat wire motor. This is beneficial for the relatively concentrated arrangement of the flat wires for transmitting the first phase AC power and the third phase AC power, and is beneficial for the arrangement of the phase belts inside the flat wire motor.

[0022] In this embodiment of the application, the distance between any flat wire used to transmit the first phase AC power in each third winding slot and the axis of the flat wire motor is greater than the distance between any flat wire used to transmit the third phase AC power in each third winding slot and the axis of the flat wire motor. That is, the flat wire used to transmit the third phase AC power in each third winding slot is arranged closer to the slot opening of the winding slot than the flat wire used to transmit the first phase AC power.

[0023] In one embodiment, a second winding slot and a third winding slot are arranged on both sides of a first winding slot. The number of winding slots that separate a second winding slot from a first winding slot and the number of winding slots that separate a third winding slot from a first winding slot are the same, or a second winding slot and a third winding slot are adjacent to a first winding slot. The number of flat wires in a second winding slot used for transmitting the first phase of AC current is equal to the number of flat wires in a third winding slot used for transmitting the first phase of AC current. The number of flat wires in a second winding slot used for transmitting the second phase of AC current is equal to the number of flat wires in a third winding slot used for transmitting the third phase of AC current.

[0024] In this embodiment, the number of flat wires used to transmit the first phase AC current in a second winding slot is equal to the number of flat wires used to transmit the first phase AC current in a third winding slot, and the number of flat wires used to transmit the second phase AC current in a second winding slot is equal to the number of flat wires used to transmit the third phase AC current in a third winding slot. This ensures a regular arrangement of the flat wires used to transmit each phase of AC current, resulting in a more regular winding pattern and a more aesthetically pleasing appearance for the motor stator. It also facilitates the automation of motor stator winding, simplifies the production process, and improves production efficiency.

[0025] In one embodiment, the number of flat wires used for transmitting the second phase AC current in a second winding slot adjacent to a first winding slot in each group of winding slots is equal to the number of flat wires used for transmitting the first phase AC current in the second winding slot furthest from a first winding slot in each group of winding slots. Similarly, the number of flat wires used for transmitting the third phase AC current in a third winding slot adjacent to a first winding slot in each group of winding slots is equal to the number of flat wires used for transmitting the first phase AC current in the third winding slot furthest from a first winding slot in each group of winding slots.

[0026] In this embodiment, the arrangement of flat wires in the multiple second winding slots for transmitting the first and second phase AC currents, and the arrangement of flat wires in the multiple third winding slots for transmitting the first and third phase AC currents, makes the arrangement of the flat wires for transmitting each phase AC current more regular. This facilitates more regular winding routing and a more aesthetically pleasing appearance of the motor stator. It also facilitates the automation of motor stator winding, simplifies the production process, and improves production efficiency.

[0027] In one embodiment, all the flat wires accommodated in the multiple sets of winding slots are divided into multiple turns of flat wires arranged radially along the flat wire motor. Each turn of flat wire is further divided into multiple sets of flat wires arranged circumferentially along the flat wire motor. Four adjacent sets of flat wires are used to transmit one of the first phase AC, the second phase AC, and the third phase AC. Each set of flat wires includes at least one flat wire accommodated in the same winding slot. The number of flat wires in each set of flat wires in at least one turn of flat wire and in each set of flat wires in an adjacent turn of flat wire is different.

[0028] In the embodiments of this application, the number of flat wires in each group of flat wires in at least one turn and its adjacent turn is different, thereby enabling the winding to achieve a short-pitch effect. This helps to reduce the harmonic winding coefficient of the flat wire motor and improve its NVH performance. It can also increase the diversity of the number of series turns in the winding, which is beneficial to improving motor performance.

[0029] In one embodiment, the multi-turn flat wire includes a first turn and an Nth turn. The distance between any flat wire in the first turn and the axis of the flat wire motor is greater than the distance between any flat wire in the multi-turn flat wire (excluding the first turn) and the axis of the flat wire motor. The distance between any flat wire in the Nth turn and the axis of the flat wire motor is less than the distance between any flat wire in the multi-turn flat wire (excluding the Nth turn) and the axis of the flat wire motor. The number of flat wires in each group of flat wires in the first turn is the same as the number of flat wires in each group of flat wires in the Nth turn. The number of flat wires in each group of flat wires in any turn between the first and Nth turns is greater than the number of flat wires in each group of flat wires in the first turn.

[0030] In this embodiment, the distance between any flat wire in the first coil and the axis of the flat wire motor is greater than the distance between any flat wire in the multiple coils (excluding the first coil) and the axis of the flat wire motor. That is, the first coil refers to the coil located at the bottom of the winding slot. Similarly, the distance between any flat wire in the Nth coil and the axis of the flat wire motor is less than the distance between any flat wire in the multiple coils (excluding the Nth coil) and the axis of the flat wire motor. That is, the Nth coil refers to the coil located at the opening of the winding slot.

[0031] In this embodiment, the number of flat wires in each group of flat wires in the first coil is the same as the number of flat wires in each group of flat wires in the Nth coil, thereby making the arrangement of multiple coils of flat wires more regular, which is beneficial to making the winding more regular and thus making the appearance of the motor stator more aesthetically pleasing.

[0032] In the embodiments of this application, the number of flat wires in each group of flat wires in any round of flat wires between the first round and the Nth round is greater than the number of flat wires in each group of flat wires in the first round. This makes the distribution of multiple rounds of flat wires in the winding slot more diverse and also helps to achieve a continuous short-pitch effect in the winding. This helps to reduce the harmonic winding coefficient of the flat wire motor and improve the NVH performance of the flat wire motor.

[0033] In one embodiment, each group of winding slots consists of 7 sequentially adjacent winding slots, and the number of second winding slots is 3. Each winding slot is used to accommodate 6 flat wires. The difference in the number of flat wires used to transmit the first phase AC current in two adjacent second winding slots in each group of winding slots is 2. The number of flat wires used to transmit the first phase AC current in a second winding slot adjacent to a first winding slot is 1.

[0034] In this embodiment, the difference in the number of flat wires used for transmitting the first phase AC current in two adjacent second winding slots within each winding slot group is 2. This makes the arrangement of the flat wires for the three-phase AC current in the winding slots more regular, the winding routing more orderly, and the appearance of the motor stator more aesthetically pleasing. The difference in the number of flat wires used for transmitting the first phase AC current in two adjacent second winding slots within each winding slot group is 2, and the number of flat wires used for transmitting the first phase AC current in a second winding slot adjacent to a first winding slot is 1. This allows the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0035] In one embodiment, each group of winding slots consists of 7 sequentially adjacent winding slots, and the number of second winding slots is 3. Each winding slot is used to accommodate 10 flat wires. The difference in the number of flat wires used to transmit the first phase AC current in two adjacent second winding slots in each group of winding slots is 3. The number of flat wires used to transmit the first phase AC current in a second winding slot adjacent to a first winding slot is 2.

[0036] In this embodiment, the difference in the number of flat wires used for transmitting the first phase AC current in two adjacent second winding slots within each winding slot group is 3. This makes the arrangement of the flat wires for the three-phase AC current in the winding slots more regular, the winding routing more orderly, and the appearance of the motor stator more aesthetically pleasing. The difference in the number of flat wires used for transmitting the first phase AC current in two adjacent second winding slots within each winding slot group is 3, and the number of flat wires used for transmitting the first phase AC current in a second winding slot adjacent to a first winding slot is 2. This allows the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0037] In one embodiment, each group of winding slots consists of 7 sequentially adjacent winding slots, and the number of second winding slots is 3. Each winding slot is used to accommodate L flat wires. The number of flat wires used to transmit the first phase AC current in each second winding slot is not equal to an integer multiple of L / 4, and the number of flat wires used to transmit the third phase AC current in each third winding slot is not equal to an integer multiple of L / 4.

[0038] In this embodiment, the number of flat wires used to transmit the first phase AC current in each second winding slot is not an integer multiple of L / 4, making the arrangement of the flat wires for the three-phase AC current in the winding slot more regular, the winding routing more orderly, and the appearance of the motor stator more aesthetically pleasing. Similarly, the number of flat wires used to transmit the third phase AC current in each third winding slot is not an integer multiple of L / 4, allowing the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving its NVH performance.

[0039] Secondly, this application provides a powertrain, which includes a reducer and a flat wire motor as described in the first aspect. The motor shaft of the flat wire motor is used to drive the input shaft of the reducer, and the output shaft of the reducer is used to drive the wheels of the electric vehicle.

[0040] In the flat-wire motor of this application embodiment, the motor stator of the flat-wire motor is configured such that the number of flat wires used to transmit the first phase AC current in any second winding slot is not equal to the difference between the number of flat wires used to transmit the first phase AC current in two adjacent second winding slots, and the number of flat wires used to transmit the first phase AC current in any third winding slot is not equal to the difference between the number of flat wires used to transmit the first phase AC current in two adjacent third winding slots. This results in different spans between the cross-layer flat wires used to transmit the same phase AC current, enabling the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat-wire motor, improving the NVH performance of the flat-wire motor, and thus improving the NVH performance of the powertrain.

[0041] Thirdly, this application provides an electric vehicle, which includes a frame, a power battery, and a powertrain as described in the second aspect. The frame is used to fix the power battery and the powertrain. The power battery is used to supply power to the motor, and the motor is used to drive the wheels of the electric vehicle through a reducer.

[0042] The powertrain in this embodiment includes a flat-wire motor. The stator of the flat-wire motor is configured such that the number of flat wires in any second winding slot used for transmitting the first phase of AC power is not equal to the difference between the number of flat wires in two adjacent second winding slots used for transmitting the first phase of AC power, and the number of flat wires in any third winding slot used for transmitting the first phase of AC power is not equal to the difference between the number of flat wires in two adjacent third winding slots used for transmitting the first phase of AC power. This results in different spans between the cross-layer flat wires used for transmitting the same phase of AC power, enabling the windings to achieve a continuous short-pitch effect. This weakens the harmonic magnetic field of the flat-wire motor, improves the NVH performance of the flat-wire motor, and further enhances the NVH performance of the powertrain, thereby improving the overall performance of the vehicle. Attached Figure Description

[0043] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments of this application will be described below.

[0044] Figure 1 This is a schematic diagram of the structure of the electric vehicle provided in the embodiments of this application;

[0045] Figure 2 This is a schematic diagram of the powertrain provided in the embodiments of this application;

[0046] Figure 3 This is a top view of the flat wire inserted into the winding slot provided in the embodiment of this application;

[0047] Figure 4 This is a schematic diagram of the structure of the hairpin coil provided in the embodiment of this application;

[0048] Figure 5 This is a schematic diagram of the connection of two parallel branches of the U-phase winding provided in the embodiments of this application;

[0049] Figure 5a yes Figure 5 An enlarged view of the left half of the schematic diagram of the connection of the two parallel branches of the U-phase winding;

[0050] Figure 5b yes Figure 5 An enlarged view of the right half of the schematic diagram of the connection of the two parallel branches of the U-phase winding;

[0051] Figure 6 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application;

[0052] Figure 6a yes Figure 6 An enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding;

[0053] Figure 6b yes Figure 6 An enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding;

[0054] Figure 7 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application;

[0055] Figure 7a yes Figure 7 Enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding;

[0056] Figure 7b yes Figure 7 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding;

[0057] Figure 8 This is a connection diagram of the third parallel branch of the U-phase winding provided in another embodiment of this application;

[0058] Figure 8a yes Figure 8 Enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding;

[0059] Figure 8b yes Figure 8 Enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding;

[0060] Figure 9 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application;

[0061] Figure 9a yes Figure 9 Enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding;

[0062] Figure 9b yes Figure 9 Enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding;

[0063] Figure 10 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application;

[0064] Figure 10a yes Figure 10 Enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding;

[0065] Figure 10b yes Figure 10 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding;

[0066] Figure 11 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application;

[0067] Figure 11a yes Figure 11 Enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding;

[0068] Figure 11b yes Figure 11 Enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding;

[0069] Figure 12 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application;

[0070] Figure 12a yes Figure 12 Enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding;

[0071] Figure 12b yes Figure 12 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding;

[0072] Figure 13 This is a connection diagram of the third parallel branch of the U-phase winding provided in another embodiment of this application;

[0073] Figure 13a yes Figure 13 Enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding;

[0074] Figure 13b yes Figure 13 Enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding;

[0075] Figure 14 This is a schematic diagram of the three-phase winding end connection provided in an embodiment of this application;

[0076] Figure 15 This is another schematic diagram of the connection of the three-phase winding end provided in the embodiment of this application;

[0077] Figure 16 This is a comparison diagram of torque pulsation at the peak operating point of the winding in Embodiment 1 of this application. Detailed Implementation

[0078] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0079] For ease of understanding, the English abbreviations and related technical terms used in the embodiments of this application will be explained and described below.

[0080] NVH is an abbreviation for Noise, Vibration, and Harshness, which refers to noise, vibration, and acoustic roughness.

[0081] Busbar: A multi-layered composite structure connector that can be considered the core channel of a power distribution system. Compared with traditional wiring methods, it has significant advantages such as convenient design, low impedance, strong anti-interference ability, high reliability, good space utilization, and rapid assembly.

[0082] Number of poles: This refers to the number of magnetic poles in a motor. Magnetic poles are divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, which means the number of pole pairs is 1. Therefore, the number of pole pairs in a motor is 1, 2, 3, or 4, and the number of poles in a motor is 2, 4, 6, or 8.

[0083] Pole pitch: The pole pitch of a winding refers to the distance on the circumferential surface occupied by each magnetic pole. For an AC motor, it refers to the slot pitch occupied by each magnetic pole along the inner circle of the stator core, expressed in terms of the number of slots. The pole pitch f is equal to the ratio of the number of stator slots Z to the number of magnetic poles 2p, i.e., f = z / 2p.

[0084] Pitch: also known as the coil span, refers to the number of slots occupied by the two effective sides of a single coil. For example, if the pitch y = 6, it means that the two effective sides of the coil are 6 slots apart, that is, the two effective sides are embedded in the 1st slot and the 7th slot respectively.

[0085] Slots per pole per phase q: The number of slots occupied by each phase winding under each magnetic pole is called the slots per pole per phase.

[0086] Phase zone: The conductors under each pole are equally distributed among the phases. The area occupied by each phase winding under each pole plane, expressed in electrical angles, is called the phase zone.

[0087] In addition, the stator winding configuration includes full-pitch winding and short-pitch winding. Full-pitch winding means that the pitch of the stator winding is equal to the pole pitch, while short-pitch winding means that the pitch of the stator winding is less than the pole pitch.

[0088] To reduce the harmonic magnetic field of a flat-wire motor and improve its NVH performance, this application provides a drive for a flat-wire motor to receive three-phase AC power. The three-phase AC power includes a first-phase AC power, a second-phase AC power, and a third-phase AC power. The stator of the flat-wire motor includes multiple sets of winding slots. Each set of winding slots includes multiple winding slots arranged sequentially along the circumference of the flat-wire motor. Each winding slot is used to accommodate multiple flat wires. Multiple sequentially adjacent winding slots constitute a set of winding slots. Each set of winding slots includes one first winding slot, multiple second winding slots, and multiple third winding slots. All the flat wires accommodated in a first winding slot are used to transmit the first-phase AC power in the three-phase AC power. Multiple second winding slots are arranged circumferentially along one side of a first winding slot of the flat wire motor. A portion of the flat wires in each second winding slot are used to transmit the first phase of AC power, and the remaining flat wires in each second winding slot are used to transmit the second phase of AC power. The number of flat wires in any second winding slot used to transmit the first phase of AC power is not equal to the difference in the number of flat wires used to transmit the first phase of AC power in two adjacent second winding slots. The number of multiple third winding slots is the same as the number of multiple second winding slots. Multiple third winding slots are arranged circumferentially along the other side of a first winding slot of the flat wire motor. A portion of the flat wires in each third winding slot are used to transmit the first phase of AC power, and the remaining flat wires in each third winding slot are used to transmit the third phase of AC power. The number of flat wires in any third winding slot used to transmit the first phase of AC power is not equal to the difference in the number of flat wires used to transmit the first phase of AC power in two adjacent third winding slots. By ensuring that the number of flat wires used to transmit the first phase AC current in any second winding slot is not equal to the difference between the number of flat wires used to transmit the first phase AC current in two adjacent second winding slots, and the number of flat wires used to transmit the first phase AC current in any third winding slot is not equal to the difference between the number of flat wires used to transmit the first phase AC current in two adjacent third winding slots, the connection between the cross-layer flat wires used to transmit the same phase AC current has different spans, enabling the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0089] Figure 1 This is a schematic diagram of the structure of the electric vehicle 1 provided in the embodiment of this application.

[0090] In one embodiment, the electric vehicle 1 includes a powertrain 10, a frame 20, a power battery 30, and wheels 40. Figure 1 As shown, the powertrain 10 and the power battery 30 are fixed to the frame 20. The powertrain 10 receives power from the power battery 30 and drives the wheels 40. In this embodiment, the power battery 30 may also be referred to as a battery pack. In this embodiment, the frame 20 may also be referred to as the vehicle body. In this embodiment, the electric vehicle 1 refers to a wheeled device driven or towed by a power unit.

[0091] Figure 2This is a schematic diagram of the powertrain 10 provided in the embodiments of this application.

[0092] In one embodiment, the powertrain 10 includes a flat-wire motor 100 and a reducer 200, such as Figure 2 As shown, the flat wire motor 100 includes a motor shaft (not shown), a motor stator, and a motor rotor (not shown). The reducer 200 includes a gear assembly (not shown), an input shaft (not shown), and an output shaft (not shown). The input shaft receives power transmitted from the motor shaft of the flat wire motor 100 and transmits the power to the output shaft through the gear assembly. The gear assembly can be configured as needed and can be a single-speed, two-speed, or multi-speed reduction gear assembly. The motor rotor is fixedly mounted on the motor shaft. After receiving AC power, the motor stator drives the motor rotor to rotate, thereby driving the motor shaft to rotate. The motor shaft of the flat wire motor 100 is used for transmission connection with the input shaft of the reducer 200, thereby driving the wheels 40 of the electric vehicle 1.

[0093] In this embodiment, the flat wire motor 100 and the reducer 200 are arranged along the axial direction of the flat wire motor 100, and the motor shaft of the flat wire motor 100 is fixed to the input shaft of the reducer 200.

[0094] In one embodiment, the powertrain 10 further includes a motor controller 300, which converts the direct current output from the power battery 30 into alternating current and supplies the alternating current to the flat wire motor 100.

[0095] The existing full-pitch windings and conventional flat wire short-pitch windings in flat wire motors have complex structures, which makes the winding processing difficult and the winding difficult. Moreover, conventional short-pitch winding methods are limited by the winding form, making it difficult to effectively reduce the harmonic winding coefficient while obtaining a high fundamental winding coefficient, thus reducing the performance of flat wire motors. Furthermore, there are few current short-pitch windings with 4 slots per pole per phase, and existing design schemes are difficult to achieve continuous short pitch, limiting their application range.

[0096] This application provides a flat wire motor that is applicable to both odd-layer and even-layer windings. It enables flat wire windings with 4 slots per pole per phase to achieve continuous short-pitch effect, while maximizing and weakening 6p and 12p harmonics, reducing winding AC losses, and simplifying the winding connection process.

[0097] The flat wire motor 100 provided in the embodiments of this application will be described in detail below.

[0098] Figure 3 This is a top view schematic diagram of the flat wire 120 inserted into the winding slot 110 according to an embodiment of this application. Figure 4 This is a schematic diagram of the structure of the hairpin coil 130 provided in the embodiment of this application. Figure 5This is a schematic diagram of the connection of the two parallel branches of the U-phase winding provided in the embodiment of this application. Figure 5a yes Figure 5 An enlarged view of the left half of the schematic diagram showing the connection of the two parallel branches of the U-phase winding. Figure 5b yes Figure 5 An enlarged view of the right half of the connection diagram of the two parallel branches of the U-phase winding. Figure 6 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application. Figure 6a yes Figure 6 An enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding. Figure 6b yes Figure 6 An enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding. Figure 7 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application. Figure 7a yes Figure 7 An enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding. Figure 7b yes Figure 7 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding. Figure 8 This is a connection diagram of the third parallel branch of the U-phase winding provided in another embodiment of this application. Figure 8a yes Figure 8 An enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding. Figure 8b yes Figure 8 An enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding. Figure 9 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application. Figure 9a yes Figure 9 An enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding. Figure 9b yes Figure 9 An enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding. Figure 10 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application. Figure 10a yes Figure 10 An enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding. Figure 10b yes Figure 10 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding. Figure 11 This is a connection diagram of the first parallel branch of the U-phase winding provided in another embodiment of this application. Figure 11a yes Figure 11 An enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding. Figure 11byes Figure 11 An enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding. Figure 12 This is a connection diagram of the second parallel branch of the U-phase winding provided in another embodiment of this application. Figure 12a yes Figure 12 An enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding. Figure 12b yes Figure 12 An enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding. Figure 13 This is a connection diagram of the third parallel branch of the U-phase winding provided in another embodiment of this application. Figure 13a yes Figure 13 An enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding. Figure 13b yes Figure 13 An enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding.

[0099] In one embodiment, the stator of the flat wire motor 100 includes a stator core and stator windings, such as... Figure 3 As shown, the stator core includes a plurality of winding slots 110. The number of winding slots 110 can be a multiple of 6. In one embodiment, the number of winding slots 110 is 72. The winding slots 110 are disposed on the inner wall of the stator core, uniformly arranged circumferentially along the inner wall of the stator core. Each winding slot 110 extends along the axial direction of the stator core and penetrates the inner wall of the stator core along the axial direction.

[0100] In one embodiment, the stator of the flat wire motor 100 includes flat wires 120 inserted into winding slots 110, the cross-section of which may be rectangular. All the flat wires 120 in the winding slots 110 are connected to form a stator winding. In one embodiment, the flat wires 120 are made of copper, and may also be referred to as conductors.

[0101] like Figure 3 and Figure 5a As shown, each winding slot 110 can contain L flat wires 120. These L flat wires 120 are arranged in layers along the radial direction R of the flat wire motor, where L is an integer greater than or equal to 4. The L flat wires 120 can also be referred to as L-layer flat wires. The L-layer flat wires within each winding slot 110 are sequentially divided along the radial direction R of the flat wire motor into L1 layer flat wire, L2 layer flat wire, L3 layer flat wire…L(A-1) layer flat wire, and L(A) layer flat wire, where A and L are the same. In one embodiment, L can be 6 or 10.

[0102] like Figure 3 and Figure 5a As shown, with Figure 5a For example, in Figure 5aThe first column on the left in the middle column lists the layer numbers of the flat wires 120 within each winding slot 110. In one embodiment, L is 6, meaning that each winding slot 110 contains 6 layers of flat wires 120. These 6 layers of flat wires 120 are respectively designated as L1, L2, L3, L4, L5, and L6. The L1 layer of flat wires is the flat wire 120 located at the bottom of the winding slot 110, and the L6 layer of flat wires is the flat wire 120 located at the opening of the winding slot 110.

[0103] Taking a three-phase motor as an example, the L-layer flat wires in all winding slots 110 can form a three-phase winding by grouping and connecting them, namely the first phase winding, the second phase winding, and the third phase winding, corresponding to the U-phase winding, V-phase winding, and W-phase winding, respectively. The first phase winding, the second phase winding, and the third phase winding are used to transmit the first phase AC current, the second phase AC current, and the third phase AC current, respectively. Any phase winding in the three-phase winding can include multiple phase units. When connected, the phase units of the first phase winding, the phase units of the second phase winding, and the phase units of the third phase winding are arranged periodically along the inner wall of the stator core. Each phase unit of each phase winding is a pole phase, and the number of winding slots 110 corresponding to each phase unit is the number of slots per pole per phase.

[0104] Each phase unit of each phase winding can be divided into four phase bands 140. Adjacent phase bands 140 in the same phase unit are staggered by one winding slot 110. All the flat wires 120 in each staggered phase band 140 of the three-phase winding constitute one turn of flat wire 120. For example, Figures 5 to 8b As shown, the L1 layer flat wires in slots 25, 26, 27, and 28 of the U-phase winding constitute one phase band 140 of the U-phase winding; the L2 and L3 layers flat wires in slots 24, 25, 26, and 27 constitute one phase band 140; the L4 and L5 layers flat wires in slots 23, 24, 25, and 26 constitute one phase band 140; and the L6 layer flat wires in slots 22, 23, 24, and 25 constitute one phase band 140. These four phase bands 140 constitute one phase unit of the U-phase. All L1 layers flat wires constitute the first coil 120a; all L2 and L3 layers flat wires constitute the second coil 120b; all L4 and L5 layers flat wires constitute the third coil 120c; and all L6 layers flat wires constitute the fourth coil 120d, which can also be referred to as the Nth coil 120n. In this configuration, two phase bands 140 belonging to the same phase unit in two adjacent turns of flat wire 120 are offset by one winding slot 110. In this configuration, one flat wire 120 belonging to the same winding slot 110 in one phase band 140 of the U-phase winding, or multiple flat wires 120 arranged sequentially adjacent to each other, constitutes a group of flat wires 1201. Each phase band 140 includes four groups of flat wires 1201.

[0105] In the U-phase winding, the winding slots 110 where the flat wires 120 belonging to the same phase unit are distributed are called a group of winding slots 110a. A group of winding slots 110a includes multiple adjacent winding slots 110. The winding slot 110 in which all the flat wires 120 in the winding slot 110 are used to transmit the first phase AC current in the three-phase AC current is called the first winding slot 110b. The winding slot 110 in which the flat wires 120 in the winding slot 110 are used to transmit both the first and second phase AC current is called the second winding slot 110c. The winding slot 110 in which the flat wires 120 in the winding slot 110 are used to transmit both the first and third phase AC current is called the third winding slot 110d. Figures 5 to 8b For example, slots 10, 11, 12, 13, 14, 15, and 16 form a winding slot 110a, slot 13 is the first winding slot 110b, slots 10, 11, and 12 are the second winding slots 110c, and slots 14, 15, and 16 are the third winding slots 110d.

[0106] like Figure 4 As shown, in one embodiment, the flat wire 120 is part of the hairpin coil 130. In one embodiment, the hairpin coil 130 is U-shaped and may also be referred to as an Upin. In one embodiment, the hairpin coil 130 includes a wire insertion segment 131 disposed within the winding slot 110 and a cross-wire segment 132 and a welding segment 133 disposed outside the winding slot 110. The two wire insertion segments 131 disposed within the winding slot 110 are two flat wires 120, and the two wire insertion segments 131 of each hairpin coil 130 are respectively inserted into two different winding slots 110. The cross-wire segment 132 may also be referred to as a crown end 132a, and the welding segment 133 may also be referred to as a welding end 133a. The crown end 132a and the welding end 133a are distributed along the axial direction of the flat wire motor 100 at both ends of the stator core. The hairpin coil 130 connects the two plug segments 131 through the cross segment 132, that is, the cross segment 132 connects the two flat wires 120.

[0107] like Figures 5 to 13b As shown, Figures 5 to 13b The first row of horizontal axes represents the slot number of the winding slot 110. In this embodiment, the multiple winding slots 110 of the motor stator are sequentially numbered along the circumferential direction C of the flat wire motor, with each winding slot 110 corresponding to a slot number. In this embodiment, the span of the hairpin coil 130 refers to the difference in slot numbers between the two flat wires 120 of the hairpin coil 130 located in the winding slots 110. In this embodiment, the span of the welding layer refers to the difference in slot numbers between the two flat wires 120 connected by the two welded sections 133.

[0108] In one embodiment, a flat wire motor 100 is used to receive three-phase alternating current, including a first-phase alternating current, a second-phase alternating current, and a third-phase alternating current. The stator of the flat wire motor 100 includes multiple sets of winding slots 110a. Each set of winding slots 110a includes multiple winding slots 110 arranged sequentially along the circumferential direction C of the flat wire motor 100. Each winding slot 110 is used to accommodate multiple flat wires 120. Multiple sequentially adjacent winding slots 110a constitute a set of winding slots 110a. Each set of winding slots 110a includes a first winding slot 110b, multiple second winding slots 110c, and multiple third winding slots 110d. All the flat wires 120 accommodated in a first winding slot 110b are used to transmit the first-phase alternating current in the three-phase alternating current. Multiple second winding slots 110c are arranged along the circumferential direction C of the flat wire motor 100 on one side of a first winding slot 110b. A portion of the flat wires 120 in each second winding slot 110c are used to transmit the first phase of AC power, and the remaining flat wires 120 in each second winding slot 110c are used to transmit the second phase of AC power. The number of flat wires 120 in any second winding slot 110c used to transmit the first phase of AC power is not equal to the difference between the number of flat wires 120 used to transmit the first phase of AC power in two adjacent second winding slots 110c. The number of multiple third winding slots 110d is the same as the number of multiple second winding slots 110c. The multiple third winding slots 110d are arranged along the circumferential direction C of the flat wire motor 100 on the other side of a first winding slot 110b. A portion of the flat wires 120 in each third winding slot 110d are used to transmit the first phase AC power, and the remaining flat wires 120 in each third winding slot 110d are used to transmit the third phase AC power. The number of flat wires 120 used to transmit the first phase AC power in any third winding slot 110d is not equal to the difference between the number of flat wires 120 used to transmit the first phase AC power in two adjacent third winding slots 110d.

[0109] In this embodiment, multiple second winding slots 110c are arranged along the circumferential direction C of the flat wire motor 100 on one side of a first winding slot 110b. A portion of the flat wires 120 in each second winding slot 110c are used to transmit the first phase AC current, and the remaining flat wires 120 in each second winding slot 110c are used to transmit the second phase AC current. This allows the multiple flat wires 120 in the multiple second winding slots 110c to be used not only to transmit the first phase AC current but also to transmit the second phase AC current. As a result, the connection of the flat wires 120 in the winding slots 110 can form a short-pitch winding, which is beneficial for weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100. The number of flat wires 120 used for transmitting the first phase AC current in any second winding slot 110c is not equal to the difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent second winding slots 110c. This allows for more options in the arrangement of flat wires 120 belonging to the same phase AC current in the winding slot 110, which is beneficial for the connection between cross-layer flat wires 120 to have different spans, enabling the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0110] like Figures 5 to 8b As shown, the number of flat wires 120 used for transmitting the first phase of AC power in slot 12 is 5, the number of flat wires 120 used for transmitting the first phase of AC power in slot 11 is 3, and the number of flat wires 120 used for transmitting the first phase of AC power in slot 10 is 1. Slots 10 and 11 are adjacent, and the difference between the number of flat wires 120 used for transmitting the first phase of AC power in slots 10 and 11 is 2, which is different from the number of flat wires 120 used for transmitting the first phase of AC power in slot 12.

[0111] like Figures 9 to 13b As shown, the number of flat wires 120 used for transmitting the first phase of AC power in slot 12 is 8, the number of flat wires 120 used for transmitting the first phase of AC power in slot 11 is 5, and the number of flat wires 120 used for transmitting the first phase of AC power in slot 10 is 2. Slots 10 and 11 are adjacent, and the difference between the number of flat wires 120 used for transmitting the first phase of AC power in slots 10 and 11 is 3, which is different from the number of flat wires 120 used for transmitting the first phase of AC power in slot 12.

[0112] In this embodiment, the number of multiple third winding slots 110d is the same as the number of multiple second winding slots 110c. The multiple third winding slots 110d are arranged along the circumference of the flat wire motor 100 on the other side of a first winding slot 110b, which makes the arrangement of each phase flat wire 120 in the winding slot 110 more regular, the winding wiring more orderly, and the appearance more beautiful.

[0113] In this embodiment, a portion of the flat wires 120 in each third winding slot 110d are used to transmit the first phase AC current, and the remaining flat wires 120 in each third winding slot 110d are used to transmit the third phase AC current. This allows multiple flat wires 120 in the multiple third winding slots 110d to be used not only to transmit the first phase AC current but also to transmit the third phase AC current. As a result, the connection of the flat wires 120 in the winding slots 110 can form a short-pitch winding, which is beneficial for weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100. The number of flat wires 120 used for transmitting the first phase AC current in any third winding slot 110d is not equal to the difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent third winding slots 110d. This allows for more options in the arrangement of flat wires 120 belonging to the same phase AC current in the winding slot 110, which is beneficial for the connection between cross-layer flat wires 120 to have different spans, enabling the winding to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0114] like Figures 5 to 8b As shown, slot 14 has 5 flat wires 120 for transmitting the first phase of AC power, slot 15 has 3 flat wires 120 for transmitting the first phase of AC power, and slot 16 has 1 flat wire 120 for transmitting the first phase of AC power. Slots 15 and 16 are adjacent, and the difference between the number of flat wires 120 for transmitting the first phase of AC power in slots 15 and 16 is 2, which is different from the number of flat wires 120 for transmitting the first phase of AC power in slot 12.

[0115] like Figures 9 to 13b As shown, the number of flat wires 120 used for transmitting the first phase of AC power in slot 14 is 8, the number of flat wires 120 used for transmitting the first phase of AC power in slot 15 is 5, and the number of flat wires 120 used for transmitting the first phase of AC power in slot 16 is 2. Slots 15 and 16 are adjacent. The difference between the number of flat wires 120 used for transmitting the first phase of AC power in slots 10 and 11 is 3, which is different from the number of flat wires 120 used for transmitting the first phase of AC power in slot 12.

[0116] In one embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of second winding slots 110c in each winding slot 110a decreases in a counterclockwise direction. The number of flat wires 120 used for transmitting the first phase AC current in the plurality of third winding slots 110d in each winding slot 110a increases in a counterclockwise direction.

[0117] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of second winding slots 110c in each group of winding slots 110a decreases in the counterclockwise direction, correspondingly increasing the number of flat wires 120 used for transmitting the second phase AC current in the plurality of second winding slots 110c in the counterclockwise direction. This results in a more orderly arrangement of winding wires used for transmitting the first and second phase AC currents, making the appearance of the motor stator more aesthetically pleasing. It also facilitates the formation of continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0118] like Figures 5 to 8b As shown, the number of flat wires 120 used for transmitting the first phase AC power in slots 12, 11, and 10 are 5, 3, and 1 respectively, and the number of flat wires 120 used for transmitting the first phase AC power in the multiple second winding slots 110c decreases in the counterclockwise direction.

[0119] like Figures 9 to 13b As shown, the number of flat wires 120 used for transmitting the first phase AC power in slots 12, 11, and 10 are 8, 5, and 2 respectively, and the number of flat wires 120 used for transmitting the first phase AC power in the multiple second winding slots 110c decreases in the counterclockwise direction.

[0120] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of third winding slots 110d in each group of winding slots 110a increases in the counterclockwise direction, correspondingly reducing the number of flat wires 120 used for transmitting the third phase AC current in the plurality of third winding slots 110d in the counterclockwise direction. This results in a more orderly arrangement of the winding wiring used for transmitting the first and third phase AC currents, making the appearance of the motor stator more aesthetically pleasing. It also facilitates the formation of continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0121] like Figures 5 to 8b As shown, the number of flat wires 120 used for transmitting the first phase AC current in slots 16, 15, and 14 are 1, 3, and 5 respectively, and the number of flat wires 120 used for transmitting the first phase AC current in the multiple third winding slots 110d increases in the counterclockwise direction.

[0122] like Figures 9 to 13b As shown, the number of flat wires 120 used for transmitting the first phase AC current in slots 16, 15, and 14 are 2, 5, and 8 respectively, and the number of flat wires 120 used for transmitting the first phase AC current in the multiple third winding slots 110d increases in the counterclockwise direction.

[0123] In one embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of second winding slots 110c in each group of winding slots 110a decreases by a greater number in a counterclockwise direction than the number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c adjacent to a first winding slot 110b. Similarly, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of third winding slots 110d in each group of winding slots 110a increases by a greater number in a counterclockwise direction than the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d adjacent to a first winding slot 110b.

[0124] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the multiple second winding slots 110c in each group of winding slots 110a decreases by more in the counterclockwise direction than the number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c adjacent to a first winding slot 110b. This results in more cross-wire methods when the flat wires 120 used for transmitting the first and second phase AC current in the second winding slot 110c are connected to the flat wires 120 in other groups of winding slots 110a. This is beneficial for forming continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0125] like Figures 5 to 8b As shown, in each winding slot 110a, the number of flat wires 120 used for transmitting the first phase AC current in the multiple second winding slots 110c decreases by 2 in the counterclockwise direction, and the number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 1.

[0126] like Figures 9 to 13b As shown, in each winding slot 110a, the number of flat wires 120 used for transmitting the first phase AC current in the multiple second winding slots 110c decreases by 3 in the counterclockwise direction, and the number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 2.

[0127] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the multiple third winding slots 110d in each group of winding slots 110a increases in the counterclockwise direction by a greater number than the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d adjacent to a first winding slot 110b. This results in more cross-wire methods when the flat wires 120 used for transmitting the first and third phase AC current in the third winding slot 110d are connected to the flat wires 120 in other groups of winding slots 110a. This is beneficial for forming continuous short-pitch windings, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0128] like Figures 5 to 8b As shown, in each winding slot 110a, the number of flat wires 120 used for transmitting the first phase AC current in the multiple third winding slots 110d increases by 2 in the counterclockwise direction, and the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d adjacent to a first winding slot 110b is 1.

[0129] like Figures 9 to 13b As shown, in each winding slot 110a, the number of flat wires 120 used for transmitting the first phase AC current in the multiple third winding slots 110d increases by 3 in the counterclockwise direction, and the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d adjacent to a first winding slot 110b is 2.

[0130] In one embodiment, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of second winding slots 110c in each group of winding slots 110a decreases by 2 in a counterclockwise direction, and the number of flat wires 120 used for transmitting the first phase AC current in the plurality of third winding slots 110d in each group of winding slots 110a increases by 2 in a counterclockwise direction. Alternatively, the number of flat wires 120 used for transmitting the first phase AC current in the plurality of second winding slots 110c in each group of winding slots 110a decreases by 3 in a counterclockwise direction, and the number of flat wires 120 used for transmitting the first phase AC current in the plurality of third winding slots 110d in each group of winding slots 110a increases by 3 in a counterclockwise direction.

[0131] In the embodiments of this application, such as Figures 5 to 8b As shown, in each winding slot 110a, the number of flat wires 120 used to transmit the first phase AC current in the multiple second winding slots 110c decreases by 2 in the counterclockwise direction, and in each winding slot 110a, the number of flat wires 120 used to transmit the first phase AC current in the multiple third winding slots 110d increases by 2 in the counterclockwise direction. This makes the arrangement of the flat wires 120 of the three-phase AC current in the winding slots 110 more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing.

[0132] In the embodiments of this application, such as Figures 9 to 13b As shown, the number of flat wires 120 used to transmit the first phase AC current in the multiple second winding slots 110c of each winding slot 110a decreases by 3 in the counterclockwise direction, and the number of flat wires 120 used to transmit the first phase AC current in the multiple third winding slots 110d of each winding slot 110a increases by 3 in the counterclockwise direction. This makes the arrangement of the flat wires 120 of the three-phase AC current in the winding slots 110 more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing.

[0133] In one embodiment, such as Figures 5 to 13bAs shown, in each second winding slot 110c, the flat wires 120 used for transmitting the first phase of AC power are arranged adjacent to each other along the radial direction R of the flat wire motor 100, and in each second winding slot 110c, the flat wires 120 used for transmitting the second phase of AC power are arranged adjacent to each other along the radial direction R of the flat wire motor. The distance between any flat wire 120 in each second winding slot 110c used for transmitting the first phase of AC power and the axis of the flat wire motor 100 is less than the distance between any flat wire 120 in each second winding slot 110c used for transmitting the second phase of AC power and the axis of the flat wire motor 100.

[0134] In this embodiment, the flat wires 120 for transmitting the first phase AC power in each second winding slot 110c are arranged adjacent to each other along the radial direction R of the flat wire motor 100, and the flat wires 120 for transmitting the second phase AC power in each second winding slot 110c are arranged adjacent to each other along the radial direction R of the flat wire motor. This arrangement is beneficial for the relatively concentrated arrangement of the flat wires 120 for transmitting the first phase AC power and the second phase AC power, and is also beneficial for the arrangement of the phase belts 140 in the flat wire motor 100.

[0135] In this embodiment of the application, the distance between any flat wire 120 used for transmitting the first phase AC power in each second winding slot 110c and the axis of the flat wire motor 100 is less than the distance between any flat wire 120 used for transmitting the second phase AC power in each second winding slot 110c and the axis of the flat wire motor 100. That is, the flat wire 120 used for transmitting the second phase AC power in each second winding slot 110c is arranged closer to the bottom of the winding slot 110 than the flat wire 120 used for transmitting the first phase AC power.

[0136] In one embodiment, such as Figures 5 to 13b As shown, in each third winding slot 110d, the flat wires 120 used for transmitting the first phase of AC current are arranged adjacent to each other along the radial direction R of the flat wire motor. Similarly, in each third winding slot 110d, the flat wires 120 used for transmitting the third phase of AC current are arranged adjacent to each other along the radial direction R of the flat wire motor. The distance between any flat wire 120 in each third winding slot 110d used for transmitting the first phase of AC current and the axis of the flat wire motor 100 is greater than the distance between any flat wire 120 in each third winding slot 110d used for transmitting the third phase of AC current and the axis of the flat wire motor 100.

[0137] In this embodiment, the flat wires 120 for transmitting the first phase AC power in each third winding slot 110d are arranged adjacent to each other along the radial direction R of the flat wire motor, and the flat wires 120 for transmitting the third phase AC power in each third winding slot 110d are arranged adjacent to each other along the radial direction R of the flat wire motor. This arrangement is beneficial for the relatively concentrated arrangement of the flat wires 120 for transmitting the first phase AC power and the third phase AC power, and is also beneficial for the arrangement of the phase bands 140 in the flat wire motor 100.

[0138] In this embodiment of the application, the distance between any flat wire 120 used for transmitting the first phase AC power in each third winding slot 110d and the axis of the flat wire motor 100 is greater than the distance between any flat wire 120 used for transmitting the third phase AC power in each third winding slot 110d and the axis of the flat wire motor 100. That is, the flat wire 120 used for transmitting the third phase AC power in each third winding slot 110d is arranged closer to the slot opening of the winding slot 110 than the flat wire 120 used for transmitting the first phase AC power.

[0139] In one embodiment, a second winding slot 110c and a third winding slot 110d are arranged on both sides of a first winding slot 110b. The number of winding slots 110 between a second winding slot 110c and a first winding slot 110b and the number of winding slots 110 between a third winding slot 110d and a first winding slot 110b are the same, or a second winding slot 110c and a third winding slot 110d are adjacent to a first winding slot 110b. The number of flat wires 120 used for transmitting the first phase AC current in a second winding slot 110c is equal to the number of flat wires 120 used for transmitting the first phase AC current in a third winding slot 110d. The number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c is equal to the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d.

[0140] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in a second winding slot 110c is equal to the number of flat wires 120 used for transmitting the first phase AC current in a third winding slot 110d, and the number of flat wires 120 used for transmitting the second phase AC current in a second winding slot 110c is equal to the number of flat wires 120 used for transmitting the third phase AC current in a third winding slot 110d. This ensures a neat arrangement of the flat wires 120 used for transmitting each phase of AC current, resulting in regular winding routing and a more aesthetically pleasing appearance of the motor stator. It also facilitates the automation of motor stator winding, simplifies the production process, and improves production efficiency.

[0141] like Figures 5 to 8b As shown, slot 12 is a second winding slot 110c, slot 13 is a first winding slot 110b, and slot 14 is a third winding slot 110d. Slots 12 and 14 are adjacent to slot 13. Slot 12 contains 5 flat wires 120 for transmitting the first phase of AC power, and slot 14 also contains 5 flat wires 120 for transmitting the first phase of AC power. Slot 12 contains 1 flat wire 120 for transmitting the second phase of AC power, and slot 14 also contains 1 flat wire 120 for transmitting the third phase of AC power.

[0142] like Figures 5 to 8bAs shown, slot 11 is a second winding slot 110c, slot 13 is a first winding slot 110b, and slot 15 is a third winding slot 110d. The number of winding slots 110 between slots 11 and 15 and slot 13 is the same. Slot 11 contains 3 flat wires 120 for transmitting the first phase of AC power, and slot 15 also contains 3 flat wires 120 for transmitting the first phase of AC power. Slot 11 contains 3 flat wires 120 for transmitting the second phase of AC power, and slot 15 also contains 3 flat wires 120 for transmitting the third phase of AC power.

[0143] like Figures 9 to 13b As shown, slot 12 is a second winding slot 110c, slot 13 is a first winding slot 110b, and slot 14 is a third winding slot 110d. Slots 12 and 14 are adjacent to slot 13. Slot 12 is a second winding slot 110c, and slot 14 is a third winding slot 110d. The number of flat wires 120 used for transmitting the first phase AC current in slot 12 is 8, and the number of flat wires 120 used for transmitting the first phase AC current in slot 14 is also 8. The number of flat wires 120 used for transmitting the second phase AC current in slot 12 is 2, and the number of flat wires 120 used for transmitting the third phase AC current in slot 14 is also 2.

[0144] like Figures 9 to 13b As shown, slot 11 is a second winding slot 110c, slot 13 is a first winding slot 110b, and slot 15 is a third winding slot 110d. The number of winding slots 110 between slots 11 and 15 and slot 13 is the same. Slot 11 contains 5 flat wires 120 for transmitting the first phase of AC power, and slot 15 also contains 5 flat wires 120 for transmitting the first phase of AC power. Slot 11 contains 5 flat wires 120 for transmitting the second phase of AC power, and slot 15 also contains 5 flat wires 120 for transmitting the third phase of AC power.

[0145] In one embodiment, the number of flat wires 120 used for transmitting the second phase AC current in one of the plurality of second winding slots 110c adjacent to one of the first winding slots 110b in each group of winding slots 110a is equal to the number of flat wires 120 used for transmitting the first phase AC current in one of the plurality of second winding slots 110c in each group of winding slots 110a that is farthest from one of the first winding slots 110b. Similarly, the number of flat wires 120 used for transmitting the third phase AC current in one of the plurality of third winding slots 110d adjacent to one of the first winding slots 110b in each group of winding slots 110a is equal to the number of flat wires 120 used for transmitting the first phase AC current in one of the plurality of third winding slots 110d in each group of winding slots 110a that is farthest from one of the first winding slots 110b.

[0146] In this embodiment, the flat wires 120 used for transmitting the first and second phase AC currents in the multiple second winding slots 110c are arranged in a regular pattern, as are the flat wires 120 used for transmitting the first and third phase AC currents in the multiple third winding slots 110d. This makes the arrangement of the flat wires 120 used for transmitting each phase AC current more regular, which is beneficial for making the winding routing more regular and for making the appearance of the motor stator more aesthetically pleasing. It also facilitates the automation of motor stator winding, simplifies the production process, and improves production efficiency.

[0147] like Figures 5 to 8b As shown, the number of flat wires 120 used for transmitting the second phase AC current in the 12th slot adjacent to a first winding slot 110b is 1. The number of flat wires 120 used for transmitting the first phase AC current in the 10th slot (farthest from a first winding slot 110b) among the multiple second winding slots 110c is also 1, and the two are equal. The number of flat wires 120 used for transmitting the third phase AC current in the 14th slot adjacent to a first winding slot 110b is 1. The number of flat wires 120 used for transmitting the first phase AC current in the 16th slot (farthest from a first winding slot 110b) among the multiple third winding slots 110d is also 1.

[0148] like Figures 9 to 13b As shown, the number of flat wires 120 used for transmitting the second phase AC current in the 12th slot adjacent to a first winding slot 110b is 2. The number of flat wires 120 used for transmitting the first phase AC current in the 10th slot (farthest from a first winding slot 110b) among the multiple second winding slots 110c is also 2, the two being equal. The number of flat wires 120 used for transmitting the third phase AC current in the 14th slot adjacent to a first winding slot 110b is 2. The number of flat wires 120 used for transmitting the first phase AC current in the 16th slot (farthest from a first winding slot 110b) among the multiple third winding slots 110d is also 2.

[0149] In one embodiment, all the flat wires 120 accommodated in the multiple sets of winding slots 110a are divided into multiple turns of flat wires 120 arranged radially R along the flat wire motor. Each turn of flat wire 120 is divided into multiple sets of flat wires 1201 arranged circumferentially C along the flat wire motor. The four adjacent sets of flat wires 1201 are used to transmit one of the first phase AC power, the second phase AC power, and the third phase AC power. Each set of flat wires 1201 includes at least one flat wire 120 accommodated in the same winding slot 110. The number of flat wires 120 in each set of flat wires 1201 in at least one turn of flat wire 120 and in each set of flat wires 1201 in an adjacent turn of flat wire 120 is different.

[0150] In this embodiment, the number of flat wires 120 in each group of flat wires 1201 in at least one turn of flat wire 120 and the adjacent turn of flat wire 120 is different, thereby enabling the winding to achieve a short-pitch effect. This helps to reduce the harmonic winding coefficient of the flat wire motor 100 and improve the NVH performance of the flat wire motor 100. It can also increase the diversity of the number of series turns of the winding, which is beneficial to improving the motor performance.

[0151] like Figures 5 to 8b As shown, all the flat wires 120 contained in the multiple winding slots 110a are divided into four coils of flat wires 120 arranged radially R along the flat wire motor. The first layer of flat wires 120 is the first coil of flat wires 120a. The second and third layers of flat wires 120 constitute the second coil of flat wires 120b. The fourth and fifth layers of flat wires 120c constitute the third coil of flat wires 120c. The sixth layer of flat wires 120d constitutes the fourth coil of flat wires 120d. The number of flat wires 120 in each group of flat wires 1201 in the first coil of flat wires 120a is 1. The number of flat wires 120 in each group of flat wires 1201 in the second coil of flat wires 120b adjacent to the first coil of flat wires 120a is 2.

[0152] like Figures 9 to 13b As shown, all the flat wires 120 contained in the multiple winding slots 110a are divided into four coils of flat wires 120 arranged radially R along the flat wire motor. The first layer of flat wires 120 and the second layer of flat wires 120 constitute the first coil of flat wires 120a. The third layer of flat wires 120, the fourth layer of flat wires 120 and the fifth layer of flat wires 120 constitute the second coil of flat wires 120b. The sixth layer of flat wires 120, the seventh layer of flat wires 120 and the eighth layer of flat wires 120 constitute the third coil of flat wires 120c. The ninth layer of flat wires 120 and the tenth layer of flat wires 120d constitute the fourth coil of flat wires 120d. The number of flat wires 120 in each group of flat wires 1201 in the first coil of flat wires 120a is 2. The number of flat wires 120 in each group of flat wires 1201 in the second coil of flat wires 120b adjacent to the first coil of flat wires 120a is 3.

[0153] In one embodiment, four adjacent sets of flat wires 1201 form a phase band 140, and two phase bands 140 in two adjacent turns of flat wires 120 are offset by a winding slot 110.

[0154] In the embodiments of this application, such as Figures 5 to 8b As shown, the four groups of flat wires 1201 formed by the first layer of flat wires 120 in slots 25, 26, 27 and 28 of the first coil of flat wire 120a constitute a phase band 140. The four groups of flat wires 1201 formed by the second layer of flat wires 120 in slots 24, 25, 26 and 27 of the second coil of flat wire 120b and the third layer of flat wire 120 constitute a phase band 140. The two phase bands 140 are offset by one winding slot 110.

[0155] like Figures 9 to 13bAs shown, the four groups of flat wires 1201 formed by the first layer of flat wires 120 and the second layer of flat wires 120 in slots 25, 26, 27 and 28 of the first coil of flat wires 120a constitute a phase band 140. The four groups of flat wires 1201 formed by the third layer of flat wires 120, the fourth layer of flat wires 120 and the fifth layer of flat wires 120 in slots 24, 25, 26 and 27 of the second coil of flat wires 120b constitute a phase band 140. The two phase bands 140 are offset by one winding slot 110.

[0156] In one embodiment, the multi-turn flat wire 120 includes a first turn of flat wire 120a and an Nth turn of flat wire 120n. The distance between any flat wire 120 in the first turn of flat wire 120a and the axis of the flat wire motor 100 is greater than the distance between any flat wire 120 in the multi-turn flat wire 120 (excluding the first turn of flat wire 120a) and the axis of the flat wire motor 100. The distance between any flat wire 120 in the Nth turn of flat wire 120n and the axis of the flat wire motor 100 is less than the distance between any flat wire 120 in the multi-turn flat wire 120 (excluding the Nth turn of flat wire 120n) and the axis of the flat wire motor 100. The number of flat wires 120 in each group of flat wires 1201 in the first turn of flat wire 120a is the same as the number of flat wires 120 in each group of flat wires 1201 in the Nth turn of flat wire 120n. The number of flat lines 120 in each group of flat lines 1201 in any round of flat lines 120 between the first round of flat lines 120a and the Nth round of flat lines 120n is greater than the number of flat lines 120 in each group of flat lines 1201 in the first round of flat lines 120a.

[0157] In this embodiment, the distance between any flat wire 120 in the first coil of flat wire 120a and the axis of the flat wire motor 100 is greater than the distance between any flat wire 120 in the multiple coils of flat wire 120 (excluding the first coil of flat wire 120a) and the axis of the flat wire motor 100. That is, the first coil of flat wire 120a refers to the coil of flat wire 120 located at the bottom of the slot within the winding slot 110. The distance between any flat wire 120 in the Nth coil of flat wire 120n and the axis of the flat wire motor 100 is less than the distance between any flat wire 120 in the multiple coils of flat wire 120 (excluding the Nth coil of flat wire 120n) and the axis of the flat wire motor 100. That is, the Nth coil of flat wire 120n refers to the coil of flat wire 120 located at the opening of the slot within the winding slot 110.

[0158] In this embodiment of the application, the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a is the same as the number of flat wires 120 in each group of flat wires 1201 in the Nth round of flat wires 120n, so that the arrangement of multiple rounds of flat wires 120 is more regular, which is conducive to making the winding more regular and thus making the appearance of the motor stator more beautiful.

[0159] like Figures 5 to 8bAs shown, the number of flat lines 120 in each group of flat lines 1201 in the first round of flat lines 120a and the Nth round of flat lines 120n is 1.

[0160] like Figures 9 to 13b As shown, the number of flat lines 120 in each group of flat lines 1201 in the first round of flat lines 120a and the Nth round of flat lines 120n is 2.

[0161] In this embodiment, the number of flat wires 120 in each group of flat wires 1201 in any round of flat wires 120 between the first round of flat wires 120a and the Nth round of flat wires 120n is greater than the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a. This makes the distribution of the multiple rounds of flat wires 120 in the winding slot 110 more diverse, and also helps to achieve a continuous short-pitch effect in the winding, thereby helping to reduce the harmonic winding coefficient of the flat wire motor 100 and improve the NVH performance of the flat wire motor 100.

[0162] like Figures 5 to 8b As shown, the number of flat wires 120 in each group of flat wires 1201 in the second round of flat wires 120b is 2, the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a is 1, and the number of flat wires 120 in each group of flat wires 1201 in the second round of flat wires 120b is greater than the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a.

[0163] like Figures 9 to 13b As shown, the number of flat wires 120 in each group of flat wires 1201 in the second round of flat wires 120b is 3, and the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a is 2. The number of flat wires 120 in each group of flat wires 1201 in the second round of flat wires 120b is greater than the number of flat wires 120 in each group of flat wires 1201 in the first round of flat wires 120a.

[0164] In one embodiment, such as Figures 5 to 8b As shown, each winding slot 110a consists of 7 consecutively adjacent winding slots 110, and there are 3 second winding slots 110c. Each winding slot 110 is used to accommodate 6 flat wires 120. The difference in the number of flat wires 120 used to transmit the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 2. The number of flat wires 120 used to transmit the first phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 1.

[0165] In this embodiment, the difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 2, making the arrangement of the flat wires 120 for the three-phase AC current in the winding slot 110 more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing. The difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 2, and the number of flat wires 120 used for transmitting the first phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 1. This allows the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0166] like Figures 5 to 8b As shown, slots 10, 11, 12, 13, 14, 15, and 16 form a winding slot 110a; slot 13 is the first winding slot 110b; slots 10, 11, and 12 form the second winding slot 110c; and slots 14, 15, and 16 form the third winding slot 110d. The difference in the number of flat wires 120 used for transmitting the first phase AC current in adjacent slots 10 and 11 is 2, and the number of flat wires 120 used for transmitting the first phase AC current in slot 12, which is adjacent to a first winding slot 110b, is 1.

[0167] In one embodiment, such as Figures 9 to 13b As shown, each winding slot 110a consists of 7 consecutively adjacent winding slots 110, and there are 3 second winding slots 110c. Each winding slot 110 is used to accommodate 10 flat wires 120. The difference in the number of flat wires 120 used to transmit the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 3. The number of flat wires 120 used to transmit the first phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 2.

[0168] In this embodiment, the difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 3, making the arrangement of the flat wires 120 for the three-phase AC current in the winding slot 110 more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing. The difference in the number of flat wires 120 used for transmitting the first phase AC current in two adjacent second winding slots 110c in each winding slot 110a is 3, and the number of flat wires 120 used for transmitting the first phase AC current in a second winding slot 110c adjacent to a first winding slot 110b is 2. This allows the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0169] like Figures 9 to 13b As shown, slots 10, 11, 12, 13, 14, 15, and 16 form a winding slot 110a; slot 13 is the first winding slot 110b; slots 10, 11, and 12 form the second winding slot 110c; and slots 14, 15, and 16 form the third winding slot 110d. The difference in the number of flat wires 120 used for transmitting the first phase AC current in adjacent slots 10 and 11 is 3, and the number of flat wires 120 used for transmitting the first phase AC current in slot 12, which is adjacent to a first winding slot 110b, is 2.

[0170] In one embodiment, such as Figures 5 to 13b As shown, each winding slot 110a consists of 7 consecutively adjacent winding slots 110, and there are 3 second winding slots 110c. Each winding slot 110 is used to accommodate L flat wires 120. The number of flat wires 120 used to transmit the first phase AC current in each second winding slot 110c is not equal to an integer multiple of L / 4. The number of flat wires 120 used to transmit the third phase AC current in each third winding slot 110d is not equal to an integer multiple of L / 4.

[0171] In this embodiment, the number of flat wires 120 used for transmitting the first phase AC current in each second winding slot 110c is not an integer multiple of L / 4, making the arrangement of the flat wires 120 for the three-phase AC current in the winding slot 110 more regular, the winding wiring more orderly, and the appearance of the motor stator more aesthetically pleasing. The number of flat wires 120 used for transmitting the third phase AC current in each third winding slot 110d is not an integer multiple of L / 4, allowing the windings to achieve a continuous short-pitch effect, thereby weakening the harmonic magnetic field of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100.

[0172] In one embodiment, the flat wire motor 100 is an m-phase motor, the stator core contains Z winding slots 110, the number of stator winding poles and the number of rotor poles are 2p, where p is a positive integer and p represents the number of pole pairs, and the number of slots per pole per phase is q = 4, where q = Z / (2mp).

[0173] In one embodiment, it is applicable to an L-layer flat wire 120 short-pitch winding structure, where L is an even number greater than or equal to 4.

[0174] In one embodiment, L is decomposed into the sum of four positive integers T1, T2, T3, and T4, i.e., L = T1 + T2 + T3 + T4, and the four positive integers T1, T2, T3, and T4 are not all equal. The flat wires 120 of layer T1 are divided into one group, the flat wires 120 of layer T2 are divided into another group, the flat wires 120 of layer T3 are divided into another group, and the flat wires 120 of layer T4 are divided into another group. The flat wires 120 of layer T2 are offset from the flat wires 120 of layer T1 by one winding slot 110 in the circumferential direction. The flat wires 120 of layer T3 are offset from the flat wires 120 of layer T2 by another winding slot 110 in the same circumferential direction. The flat wires 120 of layer T4 are offset from the flat wires 120 of layer T3 by another winding slot 110 in the same circumferential direction, so that the winding achieves the effect of continuous short pitch.

[0175] In one embodiment, in each parallel branch of each phase winding, each branch coil has flat wire 120 in each layer and is evenly and symmetrically distributed to ensure that each parallel branch of each phase has a completely balanced potential and avoid the generation of circulating current.

[0176] In one embodiment, the leads of each phase winding of the stator winding are Y-connected.

[0177] In one embodiment, the leads of each phase winding of the stator winding are connected in a Δ configuration.

[0178] In this embodiment, the winding arrangement is applicable to both even-numbered layers with an odd L / 2 value and even-numbered layers with an even L / 2 value, broadening the flexibility of winding design. Multiple flat wire groups are staggered by one winding slot, equivalent to continuous short-pitch windings, which can simultaneously reduce the winding's 6k±1 (k=1 or 2) harmonics, improving NVH performance. Each flat wire in each parallel sub-winding of each phase is evenly distributed in different layers within each pole slot. The back EMF and current of each parallel sub-winding are identical, eliminating the additional copper loss caused by winding circulating current in parallel windings, ensuring winding temperature uniformity, and thus improving motor lifespan. The three-phase leads are located in the 1st or Lth layer, or in the same layer at the bottom of the slot, with branch leads located in adjacent layers, fully utilizing radial space and simplifying the Busbar structure. Each layer's hairpin coil is independent, with no additional cross-layer hairpin coils, enabling fully automated wire insertion through independent spools, simplifying the manufacturing process and facilitating mass production.

[0179] Figure 14 This is a schematic diagram of the three-phase winding end connection provided in an embodiment of this application. Figure 15 This is another schematic diagram of the connection of the three-phase winding end provided in the embodiment of this application.

[0180] In one embodiment, a three-phase flat wire motor has stator windings divided into U-phase, V-phase, and W-phase, with each phase winding having two parallel branches. For example... Figure 14As shown, the three-phase stator windings are each composed of two parallel circuits. The two parallel branches of the U-phase winding are denoted as U1 and U2, the two parallel branches of the V-phase winding are denoted as V1 and V2, and the two parallel branches of the W-phase winding are denoted as W1 and W2. The ends of the U-phase, V-phase, and W-phase windings are connected in a Y-type configuration. In another embodiment, as shown... Figure 15 As shown, the three-phase windings of the stator winding are composed of two parallel circuits, and the ends of the U-phase, V-phase and W-phase are connected in a Δ-type manner.

[0181] The connection method of the specific parallel branches in the embodiments of this application will be described in detail below with reference to specific examples.

[0182] exist Figures 5 to 13b The winding structure is described below: Figures 5 to 13b The first row contains the slot number of the winding slot, and the first column contains the layer number of the flat wire within each winding slot, denoted by . Figure 5 For example, the motor stator has 72 winding slots, and each winding slot can have 6 layers. The first layer is the flat wire located at the bottom of the winding slot, and the sixth layer is the flat wire located at the top of the winding slot. "-" represents current flowing into the flat wire, "+" represents current flowing out of the flat wire, U1 represents the first parallel branch, U... 1in U represents the first lead-out line of the first parallel branch. 1out U1 represents the tail lead of the first parallel branch. U2 represents the second parallel branch. 2in U represents the first lead-out line of the second parallel branch. 2out U represents the tail lead of the second parallel branch. 3in U represents the first lead-out line of the third parallel branch. 3out This represents the lead-out wire at the end of the third parallel branch. It should be noted that... Figures 5 to 13b The phase band distribution in this application is one embodiment of the present application. (Swap) Figures 5 to 13b The "+" and "-" symbols in the text, for example, simultaneously... Figures 5 to 13b The changes from “U+” to “U-” and from “U-” to “U+”, as well as the corresponding modifications to the V and W phases, are all within the scope of protection of this application.

[0183] In one embodiment, the stator core has Z = 72 winding slots, the number of stator winding poles and rotor poles is 2p = 6, the number of slots per pole per phase is q = Z / (2mp) = 4, the number of flat wire layers in the winding slots is L = 6, the stator winding is divided into U phase, V phase and W phase, and the number of parallel branches set in each phase winding is 2. Figure 5 This is a schematic diagram of the connection of the two parallel branches of phase U in this embodiment.

[0184] like Figure 3 and Figures 5 to 5bAs shown, each winding slot contains L=6 layers of flat wire, with the first layer denoted as L1, the second layer as L2, the third layer as L3, the fourth layer as L4, the fifth layer as L5, and the sixth layer as L6. The first layer is the bottom layer of the winding slot, and the sixth layer is the slot opening layer.

[0185] Figures 5 to 5b Each parallel branch traverses all available flat wire layers, ensuring potential balance and preventing circulating currents. The six flat wire layers are divided into four groups: T1, T2, T3, and T4, with values ​​of 1, 2, 2, and 1 respectively. This means T1 contains the first flat wire layer, T2 contains the second and third layers, T3 contains the fourth and fifth layers, and T4 contains the sixth layer. The flat wires in layer T2 are offset by one winding slot relative to layer T1 along the circumference of the flat wire motor. The flat wires in layer T3 are offset by another winding slot relative to layer T2 along the same circumference of the flat wire motor. The flat wires in layer T4 are offset by another winding slot relative to layer T3 along the same circumference of the flat wire motor, achieving a continuous short-pitch winding effect. Flat wires belonging to the same parallel branch are sequentially connected within each group to form sub-branches of that branch.

[0186] For example, the first sub-branch of the first branch of the U phase starts from the first layer of the 14th slot. After connecting all the flat wires belonging to the first branch in the 1 / 2 layer, the tail end leads out from the second layer of the 1st slot. In this process, three types of hairpin coils with different spans are used, with spans of 8, 11 and 12 respectively.

[0187] The first lead of the second sub-branch of phase U starts from the third layer of slot 14. After connecting all the flat wires belonging to the first branch in layers 3 and 4, the tail lead is led out from the fourth layer of slot 1. Three types of hairpin coils with different spans are used, with spans of 8, 11 and 12 respectively.

[0188] The first lead of the third sub-branch of phase U starts from layer 5 of slot 14. After connecting all the flat wires belonging to the first branch in layers 5 and 6, the tail lead is led out from layer 6 of slot 1. There are three types of hairpin coils with spans of 8, 11 and 12 respectively.

[0189] Based on the three sub-branches of the first branch, there are a total of 12 types of hairpin coils.

[0190] The first, second, third, and fourth sub-branches of the second branch of U-phase can be arranged with reference to the first branch of U-phase, and will not be elaborated here.

[0191] A single cross-layer segment is used to connect the first, second, and third sub-branch coils. The span of the cross-layer segment between each layer can be equal or unequal. (This application...) Figure 5In the first embodiment shown, the span of the cross-layer segment from the 2nd layer to the 3rd layer and the span of the 4th layer to the 5th layer is 13. Except for the cross-layer segment, the span of the welding end of each sub-branch is the same, which is 13 in the first embodiment of this application. This makes the twisting angle of the welding segment the same, which simplifies the twisting, welding and coating process.

[0192] like Figures 5 to 5b As shown, the T1, T2, T3, and T4 layers of flat wire each include different phase bands. Each phase band includes four adjacent winding slots. The phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire. The phase band of the T3 layer flat wire is also offset by one winding slot relative to the phase band of the T2 layer flat wire. The phase band of the T4 layer flat wire is also offset by one winding slot relative to the phase band of the T3 layer flat wire. For example, in the T1 layer flat wire, the first layer flat wire in slots 25, 26, 27, and 28 forms a phase band; in the T2 layer flat wire, the second / third layer flat wire in slots 24, 25, 26, and 27 forms a phase band; in the T3 layer flat wire, the fourth / fifth layer flat wire in slots 23, 24, 25, and 26 forms a phase band; and in the T4 layer flat wire, the sixth layer flat wire in slots 22, 23, 24, and 25 forms a phase band.

[0193] like Figures 5 to 5b As shown, solid lines represent the wiring method of the crown end or cross-segment of the hairpin coil, while dashed lines represent the wiring method of the soldered end or soldered segment of the hairpin coil. From Figures 5 to 5b As can be seen, each phase lead is located on the 1st or 6th layer, which makes the busbar structure design simpler.

[0194] The following is combined with Figures 5 to 5b The wiring method of the two parallel U-phase branches in the embodiments of this application is described in detail below. Figures 5 to 5b The solid line connection method describes the wiring method of the stator winding at the crown end. The wiring method of the welded end of the stator winding can be referred to the dashed line connection method.

[0195] The first sub-branch of the first branch of phase U starts at the first layer of slot 14 as the incoming line terminal. 1inEnter from the first level of slot 14, exit from the second level of slot 26, then enter from the first level of slot 39, exit from the second level of slot 50, then enter from the first level of slot 63, exit from the second level of slot 2, then enter from the first level of slot 15, exit from the second level of slot 27, then enter from the first level of slot 40, exit from the second level of slot 51, then enter from the first level of slot 64, exit from the second level of slot 3, then enter from the first level of slot 16... Enter from layer 1, exit from layer 2 of slot 24, then enter from layer 1 of slot 37, exit from layer 2 of slot 48, then enter from layer 1 of slot 61, exit from layer 2 of slot 72, then enter from layer 1 of slot 13, exit from layer 2 of slot 25, then enter from layer 1 of slot 38, exit from layer 2 of slot 49, then enter from layer 1 of slot 62, exit from layer 2 of slot 1. This completes the traversal of the flat lines in layers 1 and 2.

[0196] The second sub-branch of the first branch of phase U starts at the third level of slot 14, enters from the third level of slot 14, exits from the fourth level of slot 26, then enters from the third level of slot 39, exits from the fourth level of slot 50, then enters from the third level of slot 63, exits from the fourth level of slot 2, then enters from the third level of slot 15, exits from the fourth level of slot 23, then enters from the third level of slot 36, exits from the fourth level of slot 47, then enters from the third level of slot 60, and exits from the third level of slot 71. Exit from layer 4, then enter from layer 3 of slot 12, exit from layer 4 of slot 24, then enter from layer 3 of slot 37, exit from layer 4 of slot 48, then enter from layer 3 of slot 61, exit from layer 4 of slot 72, then enter from layer 3 of slot 13, exit from layer 4 of slot 25, then enter from layer 3 of slot 38, exit from layer 4 of slot 49, then enter from layer 3 of slot 62, and exit from layer 4 of slot 1. This completes the traversal of the flat lines in layers 3 and 4.

[0197] The third sub-branch of the first branch of phase U starts at level 5 of slot 14, enters from level 5 of slot 14, exits from level 6 of slot 22, then enters from level 5 of slot 35, exits from level 6 of slot 46, then enters from level 5 of slot 59, exits from level 6 of slot 70, then enters from level 5 of slot 11, exits from level 6 of slot 23, then enters from level 5 of slot 36, exits from level 6 of slot 47, then enters from level 5 of slot 60, exits from level 6 of slot 71, and then enters from level 5 of slot 12... The wire enters from layer 5, exits from layer 6 of slot 24, then enters from layer 5 of slot 37, exits from layer 6 of slot 48, then enters from layer 5 of slot 61, exits from layer 6 of slot 72, then enters from layer 5 of slot 13, exits from layer 6 of slot 25, then enters from layer 5 of slot 38, exits from layer 6 of slot 49, then enters from layer 5 of slot 62, and exits from layer 6 of slot 1. This completes the traversal of the 5th and 6th layers of flat wire. Finally, it is led out from layer 6 of slot 1, forming the output terminal U of the first branch of the U-phase winding. 1out .

[0198] It should be noted that, in the above connection methods, for example, "entering from the first layer of the 14th slot" means connecting the flat wire of the first layer of the 14th slot at the welding end, and "leading out from the sixth layer of the 1st slot" means connecting the flat wire of the sixth layer of the 1st slot at the welding end.

[0199] The first sub-branch of the second branch of phase U starts at the 6th layer of slot 12 as the incoming line terminal. 2in Enter from the 6th level of the 12th slot, exit from the 5th level of the 1st slot, then enter from the 6th level of the 60th slot, exit from the 5th level of the 48th slot, then enter from the 6th level of the 35th slot, exit from the 5th level of the 24th slot, then enter from the 6th level of the 11th slot, exit from the 5th level of the 72nd slot, then enter from the 6th level of the 59th slot, exit from the 5th level of the 47th slot, then enter from the 6th level of the 34th slot, exit from the 5th level of the 23rd slot, and then from the 10th slot... Enter from layer 6, exit from layer 5 of slot 71, then enter from layer 6 of slot 58, exit from layer 5 of slot 50, then enter from layer 6 of slot 37, exit from layer 5 of slot 26, then enter from layer 6 of slot 13, exit from layer 5 of slot 2, then enter from layer 6 of slot 61, exit from layer 5 of slot 49, then enter from layer 6 of slot 36, exit from layer 5 of slot 25. This completes the traversal of the flat lines in layers 5 and 6.

[0200] The second sub-branch of the second branch of phase U starts at level 4 of slot 12, enters from level 4 of slot 12, exits from level 3 of slot 1, then enters from level 4 of slot 60, exits from level 3 of slot 48, then enters from level 4 of slot 35, exits from level 3 of slot 24, then enters from level 4 of slot 11, exits from level 3 of slot 72, then enters from level 4 of slot 59, exits from level 3 of slot 51, then enters from level 4 of slot 38, and exits from level 27... The process begins with the traversal of the 3rd and 4th layers of flat lines. Then, it enters from the 4th layer of the 14th slot, exits from the 3rd layer of the 3rd slot, enters from the 4th layer of the 62nd slot, exits from the 3rd layer of the 50th slot, enters from the 4th layer of the 37th slot, exits from the 3rd layer of the 26th slot, enters from the 4th layer of the 13th slot, exits from the 3rd layer of the 2nd slot, enters from the 4th layer of the 61st slot, exits from the 3rd layer of the 49th slot, enters from the 4th layer of the 36th slot, and exits from the 3rd layer of the 25th slot. This completes the traversal of the 3rd and 4th layers of flat lines.

[0201] The third sub-branch of the second branch of phase U starts at the second level of slot 12, enters from the second level of slot 12, exits from the first level of slot 1, then enters from the second level of slot 60, exits from the first level of slot 52, then enters from the second level of slot 39, exits from the first level of slot 28, then enters from the second level of slot 15, exits from the first level of slot 4, then enters from the second level of slot 63, exits from the first level of slot 51, then enters from the second level of slot 38, and from the second level of slot 27... The wire exits from layer 1, then enters from layer 2 of slot 14, exits from layer 1 of slot 3, then enters from layer 2 of slot 62, exits from layer 1 of slot 50, then enters from layer 2 of slot 37, exits from layer 1 of slot 26, then enters from layer 2 of slot 13, exits from layer 1 of slot 2, then enters from layer 2 of slot 61, exits from layer 1 of slot 49, then enters from layer 2 of slot 36, and exits from layer 1 of slot 25. This completes the traversal of the flat wires in layers 1 and 2. At this point, the wire is drawn from layer 1 of slot 25, forming the output terminal U of the second branch of the U-phase winding. 2out .

[0202] It should be noted that, in the above connection methods, for example, "entering from the 6th layer of the 12th slot" means connecting the flat wire of the 6th layer of the 12th slot at the welding end, and "leading out from the 1st layer of the 25th slot" means connecting the flat wire of the 1st layer of the 25th slot at the welding end.

[0203] Among them, the wiring method of the first branch of phase V and the first branch of phase W is as follows: Figures 5 to 5b This can be obtained by shifting the first branch of phase U. The wiring methods for the second branch of phase V and the second branch of phase W are as follows: Figures 5 to 5b It can be obtained by translating the second branch of the U-phase.

[0204] Table 1. Comparison of harmonic winding coefficients for conventional full-pitch windings and traditional short-pitch windings in Example 1.

[0205]

[0206] As shown in Table 1, the first harmonic is the fundamental wave. The winding factors for the 5th, 7th, 11th, 13th, 17th, and 19th harmonics of a conventional short-pitch winding with a pitch of 11 are 0.1629, 0.0959, 0.0165, 0.0165, 0.0959, and 0.1629, respectively, while those of this application... Figures 5 to 5b In the first embodiment shown, the winding coefficients of the 5th, 7th, 11th, 13th, 17th, and 19th harmonics of the continuous short-pitch winding are 0.0824, 0.0154, 0.0051, 0.0051, 0.0154, and 0.0824, respectively. The winding coefficients of the 5th, 7th, 11th, 13th, 17th, and 19th harmonics in the first embodiment of this application are much lower than those of the traditional short-pitch winding with a pitch of 11. The weakening effect on the 5th, 7th, 11th, 13th, 17th, and 19th harmonics of the armature side magnetic field is stronger. Moreover, the fundamental coefficient of 0.9279 is not much lower than the 0.9577 of the full-pitch winding, and they are quite close.

[0207] As shown in Table 1, this application Figures 5 to 5b In the first embodiment shown, the 7th, 11th, 13th, and 17th harmonic winding factors of the continuous short-pitch winding are 0.0154, 0.0051, 0.0051, and 0.0154, respectively. The 7th, 11th, 13th, and 17th harmonic winding factors of the conventional short-pitch winding with a pitch of 10 are 0.0408, 0.1218, 0.1218, and 0.0408, respectively. This application... Figures 5 to 5b In the first embodiment shown, the 7th, 11th, 13th, and 17th harmonic winding factors of the continuous short-pitch winding are much lower than those of a conventional short-pitch winding with a pitch of 10. Although this application Figures 5 to 5b In the first embodiment shown, the 5th and 19th harmonic winding coefficients of the continuous short-pitch winding (0.0824) are slightly higher than those of the conventional short-pitch winding (0.0531) with a pitch of 10, but this application... Figures 5 to 5b In the first embodiment shown, the fundamental winding factor is 0.9279, which is higher than the 0.9250 of the traditional short-pitch winding with a pitch of 10. This reduces the impact of the short pitch on the average torque and has the advantage of weakening higher harmonics without weakening the fundamental wave.

[0208] Figure 16 This is a comparison diagram of torque pulsation at the peak operating point of the winding in Embodiment 1 of this application. The horizontal axis represents electrical angle, and the vertical axis represents torque.

[0209] like Figure 16As shown, curve A represents the torque waveform of the continuous short-pitch winding in Embodiment 1, curve B represents the torque waveform of the conventional short-pitch winding, and curve C represents the torque waveform of the full-pitch winding. The peak torque value of the full-pitch winding can reach 430 Nm, and the trough value can be close to 413 Nm, resulting in large torque ripple. In contrast, the torque ripple at the operating point of the continuous short-pitch winding in Embodiment 1 of this application and the conventional short-pitch winding is between 413 Nm and 424 Nm. The peak torque operating point torque ripple of Embodiment 1 of this application is smaller than that of the conventional full-pitch winding and the conventional short-pitch winding.

[0210] In one embodiment, the stator core has Z = 72 winding slots, the number of stator winding poles and rotor poles is 2p = 6, the number of slots per pole per phase is q = Z / (2mp) = 4, the number of flat wire layers in the winding slots is L = 6, the stator winding is divided into U phase, V phase and W phase, and the number of parallel branches set in each phase winding is 3. Figures 6 to 8b This is a schematic diagram of the connection of the three parallel branches of phase U in this embodiment.

[0211] like Figure 3 , Figures 6 to 8b As shown, each winding slot contains L=6 layers of flat wire, with the first layer denoted as L1, the second layer as L2, the third layer as L3, the fourth layer as L4, the fifth layer as L5, and the sixth layer as L6. The first layer is the bottom layer of the winding slot, and the sixth layer is the slot opening layer.

[0212] Figures 6 to 8b Each parallel branch traverses all available flat wire layers, ensuring potential balance and preventing circulating currents. The six flat wire layers are divided into four groups: T1, T2, T3, and T4, with values ​​of 1, 2, 2, and 1 respectively. This means T1 contains the first flat wire layer, T2 contains the second and third layers, T3 contains the fourth and fifth layers, and T4 contains the sixth layer. The flat wires in layer T2 are offset by one winding slot relative to layer T1 along the circumference of the flat wire motor. The flat wires in layer T3 are offset by another winding slot relative to layer T2 along the same circumference of the flat wire motor. The flat wires in layer T4 are offset by another winding slot relative to layer T3 along the same circumference of the flat wire motor, achieving a continuous short-pitch winding effect. Flat wires belonging to the same parallel branch are sequentially connected within each group to form sub-branches of that branch.

[0213] The winding connection relationship is illustrated using the first parallel branch of phase U: The lead-in wire originates from the 2nd layer of slot 12, proceeds along the positive X-axis direction with increasing layer number, reaching the 6th layer of slot 58; it then switches to slot 70, proceeds along the negative X-axis direction with decreasing layer number, reaching the 1st layer of slot 13; it switches to slot 4, continues along the positive X-axis direction with increasing layer number, reaching the 6th layer of slot 61; it then switches to slot 1, proceeds along the negative X-axis direction with decreasing layer number, reaching the 1st layer of slot 16. Layer; switch to slot 26 in the same layer, proceed along the positive X-axis direction and the increasing layer number, to reach the 6th layer of slot 11; switch to slot 23 in the same layer, proceed along the negative X-axis direction and the decreasing layer number, to reach the 1st layer of slot 38; switch to slot 51 in the same layer, continue to proceed along the positive X-axis direction and the increasing layer number, to reach the 6th layer of slot 36; switch to slot 48 in the same layer, proceed along the negative X-axis direction and the decreasing layer number, to reach the 1st layer of slot 63; switch to slot 1 in the same layer and the process ends, the tail lead-out line is led out from slot 1.

[0214] The hairpin coils are connected across layers 2 / 3 and 4 / 5 respectively. Layer 6 has only one type of hairpin coil with a span of Z / 2p = 12. Layer 1 has three types of spans: Z / 2p+1 = 13, (Z / 2p)-q+1 = 9, and (Z / 2p)-q+2 = 10. The total number of hairpin coil types is (L / 2)+3 = 6.

[0215] Based on a similar connection method, the first lead of the second branch of phase U can be drawn from the second layer of slot 60, and the last lead can be drawn from the first layer of slot 49. Similarly, the first lead of the third branch of phase U can be drawn from the second layer of slot 36, and the last lead can be drawn from the first layer of slot 25. The three-phase leads are located on the same layer at the bottom of the slots, and the branch leads are located on adjacent layers, which simplifies the busbar structure design.

[0216] like Figures 6 to 8bAs shown, the T1, T2, T3, and T4 layers of flat wire each include different phase bands. Each phase band includes four adjacent winding slots. The phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire. The phase band of the T3 layer flat wire is also offset by one winding slot relative to the phase band of the T2 layer flat wire. The phase band of the T4 layer flat wire is also offset by one winding slot relative to the phase band of the T3 layer flat wire. For example, in the T1 layer flat wire, the first layer flat wire in slots 25, 26, 27, and 28 forms a phase band; in the T2 layer flat wire, the second / third layer flat wire in slots 24, 25, 26, and 27 forms a phase band; in the T3 layer flat wire, the fourth / fifth layer flat wire in slots 23, 24, 25, and 26 forms a phase band; and in the T4 layer flat wire, the sixth layer flat wire in slots 22, 23, 24, and 25 forms a phase band.

[0217] like Figures 6 to 8b As shown, solid lines represent the wiring method of the crown end or cross-segment of the hairpin coil, while dashed lines represent the wiring method of the solder end or solder segment of the hairpin coil.

[0218] The following is combined with Figures 6 to 8b The wiring method of the U-phase three-parallel branch in the embodiments of this application is described in detail below. Figures 6 to 8b The solid line connection method describes the wiring method of the stator winding at the crown end. The wiring method of the welded end of the stator winding can be referred to the dashed line connection method.

[0219] like Figures 6 to 6b As shown, the first branch of the U-phase winding uses the second layer of slot 12 as the input terminal U. 1in Enter from the 2nd layer of slot 12, exit from the 3rd layer of slot 24, then enter from the 4th layer of slot 35, exit from the 5th layer of slot 47, then enter from the 6th layer of slot 58, exit from the 6th layer of slot 70, then enter from the 5th layer of slot 59, exit from the 4th layer of slot 47, then enter from the 3rd layer of slot 36, exit from the 2nd layer of slot 24, then enter from the 1st layer of slot 13, exit from the 1st layer of slot 4. Thus, after the flat lines are connected, the first traversal from the 1st layer to the 6th layer can be completed.

[0220] Then, enter from the 2nd layer of slot 15, exit from the 3rd layer of slot 27, enter from the 4th layer of slot 38, exit from the 5th layer of slot 50, enter from the 6th layer of slot 61, exit from the 6th layer of slot 1, enter from the 5th layer of slot 62, exit from the 4th layer of slot 50, enter from the 3rd layer of slot 39, exit from the 2nd layer of slot 27, enter from the 1st layer of slot 16, and exit from the 1st layer of slot 26. This completes the second traversal.

[0221] Then, enter from the 2nd level of slot 37, exit from the 3rd level of slot 49, enter from the 4th level of slot 60, exit from the 5th level of slot 72, enter from the 6th level of slot 11, exit from the 6th level of slot 23, enter from the 5th level of slot 12, exit from the 4th level of slot 72, enter from the 3rd level of slot 61, exit from the 2nd level of slot 49, enter from the 1st level of slot 38, and exit from the 1st level of slot 51. This completes the third traversal.

[0222] Then, the winding enters from the second layer of slot 62 and exits from the third layer of slot 2. Next, it enters from the fourth layer of slot 13 and exits from the fifth layer of slot 25. Then, it enters from the sixth layer of slot 36 and exits from the sixth layer of slot 48. Then, it enters from the fifth layer of slot 37 and exits from the fourth layer of slot 25. Next, it enters from the third layer of slot 14 and exits from the second layer of slot 2. Then, it enters from the first layer of slot 63 and exits from the first layer of slot 1. This completes the exit from the first layer of slot 1, forming the output terminal U of the first branch of the U-phase winding. 1out .

[0223] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 12th slot" means connecting the flat wire of the second layer of the 12th slot at the welding end, and "leading out from the first layer of the 1st slot" means connecting the flat wire of the first layer of the 1st slot at the welding end.

[0224] like Figures 7 to 7b As shown, the second branch of the U-phase winding uses the second layer of slot 60 as the input terminal U. 2in Enter from the 2nd layer of slot 60, exit from the 3rd layer of slot 72, then enter from the 4th layer of slot 11, exit from the 5th layer of slot 23, then enter from the 6th layer of slot 34, exit from the 6th layer of slot 46, then enter from the 5th layer of slot 35, exit from the 4th layer of slot 23, then enter from the 3rd layer of slot 12, exit from the 2nd layer of slot 72, then enter from the 1st layer of slot 61, exit from the 1st layer of slot 52. Thus, after the flat lines are connected, the first traversal from the 1st layer to the 6th layer can be completed.

[0225] Then, enter from the 2nd level of slot 63, exit from the 3rd level of slot 3, enter from the 4th level of slot 14, exit from the 5th level of slot 26, enter from the 6th level of slot 37, exit from the 6th level of slot 49, enter from the 5th level of slot 38, exit from the 4th level of slot 26, enter from the 3rd level of slot 15, exit from the 2nd level of slot 3, enter from the 1st level of slot 64, and exit from the 1st level of slot 2. This completes the second traversal.

[0226] Then, enter from the 2nd level of slot 13, exit from the 3rd level of slot 25, enter from the 4th level of slot 36, exit from the 5th level of slot 48, enter from the 6th level of slot 59, exit from the 6th level of slot 71, enter from the 5th level of slot 60, exit from the 4th level of slot 48, enter from the 3rd level of slot 37, exit from the 2nd level of slot 25, enter from the 1st level of slot 14, and exit from the 1st level of slot 27. This completes the third traversal.

[0227] Then, the winding enters from the 2nd layer of slot 38 and exits from the 3rd layer of slot 50. Next, it enters from the 4th layer of slot 61 and exits from the 5th layer of slot 1. Then, it enters from the 6th layer of slot 12 and exits from the 6th layer of slot 26. Then, it enters from the 5th layer of slot 13 and exits from the 4th layer of slot 1. Next, it enters from the 3rd layer of slot 62 and exits from the 2nd layer of slot 50. Then, it enters from the 1st layer of slot 39 and exits from the 1st layer of slot 49. Finally, it exits from the 1st layer of slot 49, forming the output terminal U of the second branch of the U-phase winding. 2out .

[0228] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 60th slot" means connecting the flat wire of the second layer of the 60th slot at the welding end, and "leading out from the first layer of the 49th slot" means connecting the flat wire of the first layer of the 49th slot at the welding end.

[0229] like Figures 8 to 8b As shown, the third branch of the U-phase winding uses the second layer of slot 36 as the input terminal U. 3in Enter from the 2nd layer of slot 36, exit from the 3rd layer of slot 48, then enter from the 4th layer of slot 59, exit from the 5th layer of slot 71, then enter from the 6th layer of slot 10, exit from the 6th layer of slot 22, then enter from the 5th layer of slot 11, exit from the 4th layer of slot 71, then enter from the 3rd layer of slot 60, exit from the 2nd layer of slot 48, then enter from the 1st layer of slot 37, exit from the 1st layer of slot 28. Thus, after the flat lines are connected, the first traversal from the 1st layer to the 6th layer can be completed.

[0230] Then, enter from the 2nd layer of slot 39, exit from the 3rd layer of slot 51, enter from the 4th layer of slot 62, exit from the 5th layer of slot 2, enter from the 6th layer of slot 13, exit from the 6th layer of slot 25, enter from the 5th layer of slot 14, exit from the 4th layer of slot 2, enter from the 3rd layer of slot 63, exit from the 2nd layer of slot 51, enter from the 1st layer of slot 40, and exit from the 1st layer of slot 50. This completes the second traversal.

[0231] Then, enter from the 2nd level of slot 61, exit from the 3rd level of slot 1, enter from the 4th level of slot 12, exit from the 5th level of slot 24, enter from the 6th level of slot 35, exit from the 6th level of slot 47, enter from the 5th level of slot 36, exit from the 4th level of slot 24, enter from the 3rd level of slot 13, exit from the 2nd level of slot 1, enter from the 1st level of slot 62, and exit from the 1st level of slot 3. This completes the third traversal.

[0232] Then, the winding enters from the 2nd layer of slot 14 and exits from the 3rd layer of slot 26. Next, it enters from the 4th layer of slot 37 and exits from the 5th layer of slot 49. Then, it enters from the 6th layer of slot 60 and exits from the 6th layer of slot 72. Then, it enters from the 5th layer of slot 61 and exits from the 4th layer of slot 49. Next, it enters from the 3rd layer of slot 38 and exits from the 2nd layer of slot 26. Then, it enters from the 1st layer of slot 15 and exits from the 1st layer of slot 25. Finally, it exits from the 1st layer of slot 25, forming the output terminal U of the third branch of the U-phase winding. 3out .

[0233] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 36th slot" means connecting the flat wire of the second layer of the 36th slot at the welding end, and "leading out from the first layer of the 25th slot" means connecting the flat wire of the first layer of the 25th slot at the welding end.

[0234] Among them, the wiring method of the first branch of phase V and the first branch of phase W is as follows: Figures 6 to 6b This can be obtained by shifting the first branch of phase U. The wiring methods for the second branch of phase V and the second branch of phase W are as follows: Figures 7 to 7b The wiring method for the third branch of phase V and the third branch of phase W can be obtained by shifting the second branch of phase U. Figures 8 to 8b It can be obtained by translating the third branch of the U-phase.

[0235] In one embodiment, the stator core has Z = 72 winding slots, the number of stator winding poles and rotor poles is 2p = 6, the number of slots per pole per phase is q = Z / (2mp) = 4, the number of flat wire layers in the winding slots is L = 10, the stator winding is divided into U phase, V phase and W phase, and the number of parallel branches set in each phase winding is 2. Figures 9 to 10b This is a schematic diagram of the connection of the two parallel branches of phase U in this embodiment.

[0236] like Figure 3 , Figures 9 to 10bAs shown, each winding slot contains L = 10 layers of flat wire. The first layer is denoted as L1, the second as L2, the third as L3, the fourth as L4, the fifth as L5, the sixth as L6, the seventh as L7, the eighth as L8, the ninth as L9, and the tenth as L10. The first layer is the bottom layer of the winding slot, and the tenth layer is the slot opening layer.

[0237] Figures 9 to 10b Each parallel branch traverses all available flat wire layers, ensuring potential balance and preventing circulating currents. The 10 flat wire layers are divided into four groups: T1, T2, T3, and T4, with values ​​of 2, 3, 3, and 2 respectively. Specifically, T1 contains layers 1 and 2, T2 contains layers 3, 4, and 5, T3 contains layers 6, 7, and 8, and T4 contains layers 9 and 10. The flat wires in layer T2 are offset by one winding slot relative to layer T1 in a clockwise direction along the circumference of the flat wire motor. Similarly, the flat wires in layer T3 are offset by one winding slot relative to layer T2 in the same direction along the circumference of the flat wire motor, and the flat wires in layer T4 are offset by one winding slot relative to layer T3 in the same direction along the circumference of the flat wire motor, achieving a continuous short-pitch winding effect. Flat wires belonging to the same parallel branch are sequentially connected within each group to form sub-branches of that branch.

[0238] For example, the first sub-branch of the first branch of the U phase starts from the first layer of the 13th slot. After connecting all the flat wires belonging to the first branch in the 1 / 2 layer, the tail end leads out from the second layer of the 1st slot. In this process, three types of hairpin coils with spans of 9, 12 and 13 are used.

[0239] The first lead of the second sub-branch of phase U starts from the third layer of slot 13. After connecting all the flat wires belonging to the first branch in the third and fourth layers, the tail lead is led out from the fourth layer of slot 1. Three types of hairpin coils with different spans are used, with spans of 9, 12 and 13 respectively.

[0240] The first lead of the third sub-branch of phase U starts from layer 5 of slot 13. After connecting all the flat wires belonging to the first branch in layers 5 and 6, the tail lead is led out from layer 6 of slot 72. There are three types of hairpin coils with spans of 8, 11 and 12 respectively.

[0241] The first lead wire of the fourth sub-branch of phase U starts from the 7th layer of slot 13. After connecting all the flat wires belonging to the first branch in the 7th / 8th layers, the tail lead wire is led out from the 8th layer of slot 1. There are three types of hairpin coils with spans of 9, 12 and 13 respectively.

[0242] The first lead of the fifth sub-branch of phase U starts from layer 9 of slot 13. After connecting all the flat wires belonging to the first branch in layers 9 and 10, the tail lead is led out from layer 10 of slot 1. There are three types of hairpin coils with spans of 9, 12 and 13 respectively.

[0243] Based on the five sub-branches of the first branch, it can be seen that there are a total of 15 types of hairpin coils.

[0244] The first, second, third, fourth, and fifth sub-branches of the second branch of phase U can be arranged with reference to the first branch of phase U, and will not be elaborated here.

[0245] A single cross-layer line segment is used to achieve cross-layer connections between layers 2 and 3, 4 and 5, 6 and 7, and 8 and 9, connecting 5 sub-branches. The outgoing lines of the two branches are located on layers 1 and 10, simplifying the structural design of the busbar.

[0246] like Figures 9 to 10b As shown, the T1, T2, T3, and T4 layers of flat wire each include different phase bands. Each phase band includes four adjacent winding slots. The phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire. The phase band of the T3 layer flat wire is also offset by one winding slot relative to the phase band of the T2 layer flat wire. The phase band of the T4 layer flat wire is also offset by one winding slot relative to the phase band of the T3 layer flat wire. For example, in T1 layer flat wire, the first / half layer flat wires in slots 25, 26, 27 and 28 form a phase band; in T2 layer flat wire, the third / fourth / fifth layer flat wires in slots 24, 25, 26 and 27 form a phase band; in T3 layer flat wire, the sixth / seventh / eighth layer flat wires in slots 23, 24, 25 and 26 form a phase band; and in T4 layer flat wire, the ninth / tenth layer flat wires in slots 22, 23, 24 and 25 form a phase band.

[0247] like Figures 9 to 10b As shown, solid lines represent the wiring method of the crown end or cross-segment of the hairpin coil, while dashed lines represent the wiring method of the solder end or solder segment of the hairpin coil.

[0248] The following is combined with Figures 9 to 10b The wiring method of the two parallel U-phase branches in the embodiments of this application is described in detail below. Figures 9 to 10b The solid line connection method describes the wiring method of the stator winding at the crown end. The wiring method of the welded end of the stator winding can be referred to the dashed line connection method.

[0249] like Figures 9 to 9b As shown, the first sub-branch of the first branch of phase U starts at the first layer of slot 13 as the incoming line terminal U. 1inEnter from the first level of slot 13, exit from the second level of slot 26, then enter from the first level of slot 38, exit from the second level of slot 50, then enter from the first level of slot 62, exit from the second level of slot 2, then enter from the first level of slot 14, exit from the second level of slot 27, then enter from the first level of slot 39, exit from the second level of slot 51, then enter from the first level of slot 63, exit from the second level of slot 3, and then from the first level of slot 15... Enter from layer 1, exit from layer 2 of slot 28, then enter from layer 1 of slot 40, exit from layer 2 of slot 52, then enter from layer 1 of slot 64, exit from layer 2 of slot 4, then enter from layer 1 of slot 16, exit from layer 2 of slot 25, then enter from layer 1 of slot 37, exit from layer 2 of slot 49, then enter from layer 1 of slot 61, exit from layer 2 of slot 1. This completes the traversal of the flat lines in layers 1 and 2.

[0250] The second sub-branch of the first branch of phase U starts at the third level of slot 13, enters from the third level of slot 13, exits from the fourth level of slot 26, then enters from the third level of slot 38, exits from the fourth level of slot 50, then enters from the third level of slot 62, exits from the fourth level of slot 2, then enters from the third level of slot 14, exits from the fourth level of slot 27, then enters from the third level of slot 39, exits from the fourth level of slot 51, then enters from the third level of slot 63, and so on. The process proceeds from layer 4, then from layer 3 of slot 15, from layer 4 of slot 24, from layer 3 of slot 36, from layer 4 of slot 48, from layer 3 of slot 60, from layer 4 of slot 72, from layer 3 of slot 12, from layer 4 of slot 25, from layer 3 of slot 37, from layer 4 of slot 49, from layer 3 of slot 61, and from layer 4 of slot 1. This completes the traversal of the flat lines in layers 3 and 4.

[0251] The third sub-branch of the first branch of phase U starts at level 5 of slot 13, enters at level 5 of slot 13, exits at level 6 of slot 24, then enters at level 5 of slot 38, exits at level 6 of slot 49, then enters at level 5 of slot 62, exits at level 6 of slot 1, then enters at level 5 of slot 14, exits at level 6 of slot 26, then enters at level 5 of slot 39, exits at level 6 of slot 50, then enters at level 5 of slot 63, and exits at level 5 of slot 2... The process proceeds from layer 6, then from layer 5 of slot 15, out from layer 6 of slot 23, then from layer 5 of slot 36, out from layer 6 of slot 47, then from layer 5 of slot 60, out from layer 6 of slot 71, then from layer 5 of slot 12, out from layer 6 of slot 24, then from layer 5 of slot 37, out from layer 6 of slot 48, then from layer 5 of slot 61, out from layer 6 of slot 72. This completes the traversal of the flat lines in layers 5 and 6.

[0252] The fourth sub-branch of the first branch of phase U starts at level 7 of slot 13, enters at level 7 of slot 13, exits at level 8 of slot 26, then enters at level 7 of slot 38, exits at level 8 of slot 50, then enters at level 7 of slot 62, exits at level 8 of slot 2, then enters at level 7 of slot 14, exits at level 8 of slot 23, then enters at level 7 of slot 35, exits at level 8 of slot 47, then enters at level 7 of slot 59, and exits at level 71... Exit from layer 8, then enter from layer 7 of slot 11, exit from layer 8 of slot 24, then enter from layer 7 of slot 36, exit from layer 8 of slot 48, then enter from layer 7 of slot 60, exit from layer 8 of slot 72, then enter from layer 7 of slot 12, exit from layer 8 of slot 25, then enter from layer 7 of slot 37, exit from layer 8 of slot 49, then enter from layer 7 of slot 61, and exit from layer 8 of slot 1. This completes the traversal of the flat lines in layers 7 and 8.

[0253] The fifth sub-branch of the first branch of phase U starts at level 9 of slot 13, enters at level 9 of slot 13, exits at level 10 of slot 22, then enters at level 9 of slot 34, exits at level 10 of slot 46, then enters at level 9 of slot 58, exits at level 10 of slot 70, then enters at level 9 of slot 10, exits at level 10 of slot 23, then enters at level 9 of slot 35, exits at level 10 of slot 47, then enters at level 9 of slot 59, exits at level 10 of slot 71, and so on. Then, it enters from the 9th layer of slot 11 and exits from the 10th layer of slot 24. Next, it enters from the 9th layer of slot 36 and exits from the 10th layer of slot 48. Then, it enters from the 9th layer of slot 60 and exits from the 10th layer of slot 72. Then, it enters from the 9th layer of slot 12 and exits from the 10th layer of slot 25. Then, it enters from the 9th layer of slot 37 and exits from the 10th layer of slot 49. Then, it enters from the 9th layer of slot 61 and exits from the 10th layer of slot 1. Finally, it exits from the 10th layer of slot 1, forming the output terminal U of the first branch of the U-phase winding. 1out .

[0254] It should be noted that, in the above connection methods, for example, "entering from the first layer of the 13th slot" means connecting the flat wire of the first layer of the 13th slot at the welding end, and "leading out from the tenth layer of the 1st slot" means connecting the flat wire of the tenth layer of the 1st slot at the welding end.

[0255] like Figures 10 to 10b As shown, the first sub-branch of the second branch of phase U starts at the 10th layer of slot 13 as the incoming line terminal U. 2in Enter from the 10th level of the 13th slot, exit from the 9th level of the 1st slot, then enter from the 10th level of the 61st slot, exit from the 9th level of the 48th slot, then enter from the 10th level of the 36th slot, exit from the 9th level of the 24th slot, then enter from the 10th level of the 12th slot, exit from the 9th level of the 72nd slot, then enter from the 10th level of the 60th slot, exit from the 9th level of the 47th slot, then enter from the 10th level of the 35th slot, exit from the 9th level of the 23rd slot, then from the 11th slot... Enter from layer 10, exit from layer 9 of slot 71, then enter from layer 10 of slot 59, exit from layer 9 of slot 46, then enter from layer 10 of slot 34, exit from layer 9 of slot 22, then enter from layer 10 of slot 10, exit from layer 9 of slot 70, then enter from layer 10 of slot 58, exit from layer 9 of slot 49, then enter from layer 10 of slot 37, exit from layer 9 of slot 25. This completes the traversal of the flat lines in layers 9 and 10.

[0256] The second sub-branch of the second branch of phase U starts at level 8 of slot 13, enters from level 8 of slot 13, exits from level 7 of slot 1, then enters from level 8 of slot 61, exits from level 7 of slot 48, then enters from level 8 of slot 36, exits from level 7 of slot 24, then enters from level 8 of slot 12, exits from level 7 of slot 72, then enters from level 8 of slot 60, exits from level 7 of slot 47, then enters from level 8 of slot 35, and from level 8 of slot 23... Exit from layer 7, then enter from layer 8 of slot 11, exit from layer 7 of slot 71, then enter from layer 8 of slot 59, exit from layer 7 of slot 50, then enter from layer 8 of slot 38, exit from layer 7 of slot 26, then enter from layer 8 of slot 14, exit from layer 7 of slot 2, then enter from layer 8 of slot 62, exit from layer 7 of slot 49, then enter from layer 8 of slot 37, and exit from layer 7 of slot 25. This completes the traversal of the flat lines in layers 7 and 8.

[0257] The third sub-branch of the second branch of phase U starts at level 6 of slot 13, enters at level 6 of slot 13, exits at level 5 of slot 2, then enters at level 6 of slot 61, exits at level 5 of slot 49, then enters at level 6 of slot 36, exits at level 5 of slot 25, then enters at level 6 of slot 12, exits at level 5 of slot 1, then enters at level 6 of slot 60, exits at level 5 of slot 48, then enters at level 6 of slot 35, and exits at level 6 of slot 24. Exit from layer 5, then enter from layer 6 of slot 11, exit from layer 5 of slot 72, then enter from layer 6 of slot 59, exit from layer 5 of slot 51, then enter from layer 6 of slot 38, exit from layer 5 of slot 27, then enter from layer 6 of slot 14, exit from layer 5 of slot 3, then enter from layer 6 of slot 62, exit from layer 5 of slot 50, then enter from layer 6 of slot 37, and exit from layer 5 of slot 26. This completes the traversal of the flat lines in layers 5 and 6.

[0258] The fourth sub-branch of the second branch of phase U starts at level 4 of slot 13, enters from level 4 of slot 13, exits from level 3 of slot 1, then enters from level 4 of slot 61, exits from level 3 of slot 48, then enters from level 4 of slot 36, exits from level 3 of slot 24, then enters from level 4 of slot 12, exits from level 3 of slot 72, then enters from level 4 of slot 60, exits from level 3 of slot 51, then enters from level 4 of slot 39, and exits from level 27... The process begins with the traversal of the 3rd and 4th layers of flat lines. Then, it enters from the 4th layer of the 15th slot, exits from the 3rd layer of the 3rd slot, enters from the 4th layer of the 63rd slot, exits from the 3rd layer of the 50th slot, enters from the 4th layer of the 38th slot, exits from the 3rd layer of the 26th slot, enters from the 4th layer of the 14th slot, exits from the 3rd layer of the 2nd slot, enters from the 4th layer of the 62nd slot, exits from the 3rd layer of the 49th slot, enters from the 4th layer of the 37th slot, and exits from the 3rd layer of the 25th slot. This completes the traversal of the 3rd and 4th layers of flat lines.

[0259] The fifth sub-branch of the second branch of phase U starts at the second level of slot 13, enters from the second level of slot 13, exits from the first level of slot 1, then enters from the second level of slot 61, exits from the first level of slot 52, then enters from the second level of slot 40, exits from the first level of slot 28, then enters from the second level of slot 16, exits from the first level of slot 4, then enters from the second level of slot 64, exits from the first level of slot 51, then enters from the second level of slot 39, exits from the first level of slot 27, and then enters from the second level of slot 15... The winding process proceeds layer by layer, starting from the first layer of slot 3, then from the second layer of slot 63, then from the first layer of slot 50, then from the second layer of slot 38, then from the first layer of slot 26, then from the second layer of slot 14, then from the first layer of slot 2, then from the second layer of slot 62, then from the first layer of slot 49, then from the second layer of slot 37, and finally from the first layer of slot 25. This completes the traversal of the first and second layers of flat wire. Finally, the wire is drawn from the first layer of slot 25, forming the output terminal U of the second branch of the U-phase winding. 2out .

[0260] It should be noted that, in the above connection methods, for example, "entering from the 10th layer of the 13th slot" means connecting the flat wire of the 10th layer of the 13th slot at the welding end, and "leading out from the 1st layer of the 25th slot" means connecting the flat wire of the 1st layer of the 25th slot at the welding end.

[0261] Among them, the wiring method of the first branch of phase V and the first branch of phase W is as follows: Figures 9 to 9b This can be obtained by shifting the first branch of phase U. The wiring methods for the second branch of phase V and the second branch of phase W are as follows: Figures 10 to 10b It can be obtained by translating the second branch of the U-phase.

[0262] In one embodiment, the stator core has Z = 72 winding slots, the number of stator winding poles and rotor poles is 2p = 6, the number of slots per pole per phase is q = Z / (2mp) = 4, the number of flat wire layers in the winding slots is L = 10, the stator winding is divided into U phase, V phase and W phase, and the number of parallel branches set in each phase winding is 3. Figures 11 to 13b This is a schematic diagram of the connection of the three parallel branches of phase U in this embodiment.

[0263] like Figure 3 , Figures 11 to 13b As shown, each winding slot contains L = 10 layers of flat wire. The first layer is denoted as L1, the second as L2, the third as L3, the fourth as L4, the fifth as L5, the sixth as L6, the seventh as L7, the eighth as L8, the ninth as L9, and the tenth as L10. The first layer is the bottom layer of the winding slot, and the tenth layer is the slot opening layer.

[0264] Figures 11 to 13b Each parallel branch traverses all available flat wire layers, ensuring potential balance and preventing circulating currents. The 10 flat wire layers are divided into four groups: T1, T2, T3, and T4, with values ​​of 2, 3, 3, and 2 respectively. Specifically, T1 contains layers 1 and 2, T2 contains layers 3, 4, and 5, T3 contains layers 6, 7, and 8, and T4 contains layers 9 and 10. The flat wires in layer T2 are offset by one winding slot relative to layer T1 in a clockwise direction along the circumference of the flat wire motor. Similarly, the flat wires in layer T3 are offset by one winding slot relative to layer T2 in the same direction along the circumference of the flat wire motor, and the flat wires in layer T4 are offset by one winding slot relative to layer T3 in the same direction along the circumference of the flat wire motor, achieving a continuous short-pitch winding effect. Flat wires belonging to the same parallel branch are sequentially connected within each group to form sub-branches of that branch.

[0265] The winding connection relationship is illustrated using the first parallel branch of phase U: The lead-in wire originates from the second layer of slot 13, proceeds along the positive X-axis direction with increasing layer number, reaching the tenth layer of slot 34; it then switches to slot 46, proceeds along the negative X-axis direction with decreasing layer number, reaching the first layer of slot 13; it switches to slot 4, continues along the positive X-axis direction with increasing layer number, reaching the tenth layer of slot 37; it then switches to slot 49, proceeds along the negative X-axis direction with decreasing layer number, reaching the tenth layer of slot 16. 1st floor; switch to slot 26 in the same floor, proceed along the positive X-axis direction and the direction of increasing floor number, to reach the 10th floor of slot 59; switch to slot 71 in the same floor, proceed along the negative X-axis direction and the direction of decreasing floor number, to reach the 1st floor of slot 38; switch to slot 51 in the same floor, continue to proceed along the positive X-axis direction and the direction of increasing floor number, to reach the 10th floor of slot 12; switch to slot 24 in the same floor, proceed along the negative X-axis direction and the direction of decreasing floor number, to reach the 1st floor of slot 63; switch to slot 1 in the same floor and the process ends, the tail lead-out line is led out from slot 1. The hairpin coils are connected across layers 2 / 3, 4 / 5, 6 / 7, and 8 / 9 respectively. Layer 10 has only one type of hairpin coil with a span of Z / 2p = 12. Layer 1 has three types of spans: Z / 2p+1 = 13, Z / 2p-q+1 = 9, and Z / 2p-q+2 = 10. The total number of hairpin coil coil types is L / 2+3 = 8.

[0266] Based on a similar connection method, the first lead of the second branch of phase U can be drawn from the second layer of slot 61, and the last lead can be drawn from the first layer of slot 49; the first lead of the third branch of phase U can be drawn from the second layer of slot 37, and the last lead can be drawn from the first layer of slot 25. The three-phase leads are located at the bottom of the slots on the same layer, and the branch leads are located on adjacent layers, which simplifies the busbar structure design.

[0267] like Figures 11 to 13bAs shown, the T1, T2, T3, and T4 layers of flat wire each include different phase bands. Each phase band includes four adjacent winding slots. The phase band of the T2 layer flat wire is offset by one winding slot relative to the phase band of the T1 layer flat wire. The phase band of the T3 layer flat wire is also offset by one winding slot relative to the phase band of the T2 layer flat wire. The phase band of the T4 layer flat wire is also offset by one winding slot relative to the phase band of the T3 layer flat wire. For example, in T1 layer flat wire, the first / half layer flat wires in slots 25, 26, 27 and 28 form a phase band; in T2 layer flat wire, the third / fourth / fifth layer flat wires in slots 24, 25, 26 and 27 form a phase band; in T3 layer flat wire, the sixth / seventh / eighth layer flat wires in slots 23, 24, 25 and 26 form a phase band; and in T4 layer flat wire, the ninth / tenth layer flat wires in slots 22, 23, 24 and 25 form a phase band.

[0268] like Figures 11 to 13b As shown, solid lines represent the wiring method of the crown end or cross-segment of the hairpin coil, while dashed lines represent the wiring method of the solder end or solder segment of the hairpin coil.

[0269] The following is combined with Figures 11 to 13b The wiring method of the two parallel U-phase branches in the embodiments of this application is described in detail below. Figures 11 to 13b The solid line connection method describes the wiring method of the stator winding at the crown end. The wiring method of the welded end of the stator winding can be referred to the dashed line connection method.

[0270] like Figures 11 to 11b As shown, the first branch of phase U uses the second layer of slot 13 as its input terminal U. 1in Entering from the 2nd layer of slot 13, exiting from the 3rd layer of slot 24, then entering from the 4th layer of slot 36, exiting from the 5th layer of slot 48, then entering from the 6th layer of slot 59, exiting from the 7th layer of slot 71, then entering from the 8th layer of slot 11, exiting from the 9th layer of slot 22, then entering from the 10th layer of slot 34, exiting from the 10th layer of slot 46, then entering from the 9th layer of slot 34, exiting from the 8th layer of slot 23, then entering from the 7th layer of slot 11, exiting from the 6th layer of slot 71, then entering from the 5th layer of slot 60, exiting from the 4th layer of slot 48, then entering from the 3rd layer of slot 36, exiting from the 2nd layer of slot 25, then entering from the 1st layer of slot 13, exiting from the 1st layer of slot 4. This completes the first traversal of the flat lines from the 1st to the 10th layers.

[0271] Then enter from the 2nd level of slot 16, exit from the 3rd level of slot 27, enter from the 4th level of slot 39, exit from the 5th level of slot 51, enter from the 6th level of slot 62, exit from the 7th level of slot 2, enter from the 8th level of slot 14, exit from the 9th level of slot 25, enter from the 10th level of slot 37, exit from the 10th level of slot 49, enter from the 9th level of slot 37, exit from the 8th level of slot 26, enter from the 7th level of slot 14, exit from the 6th level of slot 2, enter from the 5th level of slot 63, exit from the 4th level of slot 51, enter from the 3rd level of slot 39, exit from the 2nd level of slot 28, enter from the 1st level of slot 16, and exit from the 1st level of slot 26. This completes the second traversal.

[0272] Then enter from the 2nd level of slot 38, exit from the 3rd level of slot 49, enter from the 4th level of slot 61, exit from the 5th level of slot 1, enter from the 6th level of slot 12, exit from the 7th level of slot 24, enter from the 8th level of slot 36, exit from the 9th level of slot 47, enter from the 10th level of slot 59, exit from the 10th level of slot 71, enter from the 9th level of slot 59, exit from the 8th level of slot 48, enter from the 7th level of slot 36, exit from the 6th level of slot 24, enter from the 5th level of slot 13, exit from the 4th level of slot 1, enter from the 3rd level of slot 61, exit from the 2nd level of slot 50, enter from the 1st level of slot 38, and exit from the 1st level of slot 51. This completes the third traversal.

[0273] Then it enters from the 2nd layer of slot 63, exits from the 3rd layer of slot 2, then enters from the 4th layer of slot 14, exits from the 5th layer of slot 26, then enters from the 6th layer of slot 37, exits from the 7th layer of slot 49, then enters from the 8th layer of slot 61, exits from the 9th layer of slot 72, then enters from the 10th layer of slot 12, exits from the 10th layer of slot 24, then enters from the 9th layer of slot 12, exits from the 8th layer of slot 1, then enters from the 7th layer of slot 61, exits from the 6th layer of slot 49, then enters from the 5th layer of slot 38, exits from the 4th layer of slot 26, then enters from the 3rd layer of slot 14, exits from the 2nd layer of slot 3, then enters from the 1st layer of slot 63, exits from the 1st layer of slot 1, thus forming the output terminal U of the first branch of the U-phase winding from the 1st layer of slot 1. 1out .

[0274] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 13th slot" means connecting the flat wire of the second layer of the 13th slot at the welding end, and "leading out from the first layer of the 1st slot" means connecting the flat wire of the first layer of the 1st slot at the welding end.

[0275] like Figures 12 to 12bAs shown, the second branch of phase U uses the second layer of slot 61 as the input terminal U. 2in Entering from the 2nd layer of slot 61, exiting from the 3rd layer of slot 72, then entering from the 4th layer of slot 12, exiting from the 5th layer of slot 24, then entering from the 6th layer of slot 35, exiting from the 7th layer of slot 47, then entering from the 8th layer of slot 59, exiting from the 9th layer of slot 70, then entering from the 10th layer of slot 10, exiting from the 10th layer of slot 22, then entering from the 9th layer of slot 10, exiting from the 8th layer of slot 71, then entering from the 7th layer of slot 59, exiting from the 6th layer of slot 47, then entering from the 5th layer of slot 36, exiting from the 4th layer of slot 24, then entering from the 3rd layer of slot 12, exiting from the 2nd layer of slot 1, then entering from the 1st layer of slot 61, exiting from the 1st layer of slot 52. This completes the first traversal of the flat lines from the 1st to the 10th layers.

[0276] Then enter from the 2nd level of slot 64, exit from the 3rd level of slot 3, then enter from the 4th level of slot 15, exit from the 5th level of slot 27, then enter from the 6th level of slot 38, exit from the 7th level of slot 50, then enter from the 8th level of slot 62, exit from the 9th level of slot 1, then enter from the 10th level of slot 13, exit from the 10th level of slot 25, then enter from the 9th level of slot 13, exit from the 8th level of slot 2, then enter from the 7th level of slot 62, exit from the 6th level of slot 50, then enter from the 5th level of slot 39, exit from the 4th level of slot 27, then enter from the 3rd level of slot 15, exit from the 2nd level of slot 4, then enter from the 1st level of slot 64, exit from the 1st level of slot 2. This completes the second traversal.

[0277] Then enter from the 2nd level of slot 14, exit from the 3rd level of slot 25, enter from the 4th level of slot 37, exit from the 5th level of slot 49, enter from the 6th level of slot 60, exit from the 7th level of slot 72, enter from the 8th level of slot 12, exit from the 9th level of slot 23, enter from the 10th level of slot 35, exit from the 10th level of slot 47, enter from the 9th level of slot 35, exit from the 8th level of slot 24, enter from the 7th level of slot 12, exit from the 6th level of slot 72, enter from the 5th level of slot 61, exit from the 4th level of slot 49, enter from the 3rd level of slot 37, exit from the 2nd level of slot 26, enter from the 1st level of slot 14, and exit from the 1st level of slot 27. This completes the third traversal.

[0278] Then it enters from the 2nd layer of slot 39, exits from the 3rd layer of slot 50, then enters from the 4th layer of slot 62, exits from the 5th layer of slot 2, then enters from the 6th layer of slot 13, exits from the 7th layer of slot 25, then enters from the 8th layer of slot 37, exits from the 9th layer of slot 48, then enters from the 10th layer of slot 60, exits from the 10th layer of slot 72, then enters from the 9th layer of slot 60, exits from the 8th layer of slot 49, then enters from the 7th layer of slot 37, exits from the 6th layer of slot 25, then enters from the 5th layer of slot 14, exits from the 4th layer of slot 2, then enters from the 3rd layer of slot 62, exits from the 2nd layer of slot 51, then enters from the 1st layer of slot 39, exits from the 1st layer of slot 49, and finally exits from the 1st layer of slot 49, forming the output terminal U of the second branch of the U-phase winding. 2out .

[0279] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 61st slot" means connecting the flat wire of the second layer of the 61st slot at the welding end, and "leading out from the first layer of the 49th slot" means connecting the flat wire of the first layer of the 49th slot at the welding end.

[0280] like Figures 13 to 13b As shown, the third branch of phase U uses the second layer of slot 37 as its input terminal U. 3in Entering from the 2nd layer of slot 37, exiting from the 3rd layer of slot 48, then entering from the 4th layer of slot 60, exiting from the 5th layer of slot 72, then entering from the 6th layer of slot 11, exiting from the 7th layer of slot 23, then entering from the 8th layer of slot 35, exiting from the 9th layer of slot 46, then entering from the 10th layer of slot 58, exiting from the 10th layer of slot 70, then entering from the 9th layer of slot 58, exiting from the 8th layer of slot 47, then entering from the 7th layer of slot 35, exiting from the 6th layer of slot 23, then entering from the 5th layer of slot 12, exiting from the 4th layer of slot 72, then entering from the 3rd layer of slot 60, exiting from the 2nd layer of slot 49, then entering from the 1st layer of slot 37, exiting from the 1st layer of slot 28. This completes the first traversal of the flat lines from the 1st to the 10th layers.

[0281] Then enter from the 2nd level of slot 40, exit from the 3rd level of slot 51, enter from the 4th level of slot 63, exit from the 5th level of slot 3, enter from the 6th level of slot 14, exit from the 7th level of slot 26, enter from the 8th level of slot 38, exit from the 9th level of slot 49, enter from the 10th level of slot 61, exit from the 10th level of slot 1, enter from the 9th level of slot 61, exit from the 8th level of slot 50, enter from the 7th level of slot 38, exit from the 6th level of slot 26, enter from the 5th level of slot 15, exit from the 4th level of slot 3, enter from the 3rd level of slot 63, exit from the 2nd level of slot 52, enter from the 1st level of slot 40, and exit from the 1st level of slot 50. This completes the second traversal.

[0282] Then enter from the 2nd level of slot 62, exit from the 3rd level of slot 1, then enter from the 4th level of slot 13, exit from the 5th level of slot 25, then enter from the 6th level of slot 36, exit from the 7th level of slot 48, then enter from the 8th level of slot 60, exit from the 9th level of slot 71, then enter from the 10th level of slot 11, exit from the 10th level of slot 23, then enter from the 9th level of slot 11, exit from the 8th level of slot 72, then enter from the 7th level of slot 60, exit from the 6th level of slot 48, then enter from the 5th level of slot 37, exit from the 4th level of slot 25, then enter from the 3rd level of slot 13, exit from the 2nd level of slot 2, then enter from the 1st level of slot 62, exit from the 1st level of slot 3, thus completing the third traversal.

[0283] Then it enters from the 2nd layer of slot 15, exits from the 3rd layer of slot 26, then enters from the 4th layer of slot 38, exits from the 5th layer of slot 50, then enters from the 6th layer of slot 61, exits from the 7th layer of slot 1, then enters from the 8th layer of slot 13, exits from the 9th layer of slot 24, then enters from the 10th layer of slot 36, exits from the 10th layer of slot 48, then enters from the 9th layer of slot 36, exits from the 8th layer of slot 25, then enters from the 7th layer of slot 13, exits from the 6th layer of slot 1, then enters from the 5th layer of slot 65, exits from the 4th layer of slot 50, then enters from the 3rd layer of slot 38, exits from the 2nd layer of slot 26, then enters from the 1st layer of slot 15, exits from the 1st layer of slot 25, and finally exits from the 1st layer of slot 25, forming the output terminal U of the third branch of the U-phase winding. 3out .

[0284] It should be noted that, in the above connection methods, for example, "entering from the second layer of the 37th slot" means connecting the flat wire of the second layer of the 37th slot at the welding end, and "leading out from the first layer of the 25th slot" means connecting the flat wire of the first layer of the 25th slot at the welding end.

[0285] Among them, the wiring method of the first branch of phase V and the first branch of phase W is as follows: Figures 11 to 11b This can be obtained by shifting the first branch of phase U. The wiring methods for the second branch of phase V and the second branch of phase W are as follows: Figures 12 to 12b The wiring method for the third branch of phase V and the third branch of phase W can be obtained by shifting the second branch of phase U. Figures 13 to 13b It can be obtained by translating the third branch of the U-phase.

[0286] like Figures 5 to 13b As shown in Embodiments 1 to 4, the winding arrangement in this application is applicable to both even-numbered layers with an odd L / 2 value and even-numbered layers with an even L / 2 value, thus broadening the flexibility of winding design. Multiple flat wire groups are staggered by one winding slot, equivalent to continuous short-pitch windings, which can simultaneously reduce the winding's 6k±1 (k=1 or 2) harmonics, improving NVH performance. Each flat wire in each parallel sub-winding of each phase is evenly distributed in different layers within each pole slot. The back EMF and current of each parallel sub-winding are identical, eliminating the additional copper loss caused by winding circulating current in parallel windings, ensuring winding temperature uniformity, and thus improving motor lifespan. The three-phase leads are located in the 1st or Lth layer, or in the same layer at the bottom of the slot, and the branch leads are located in adjacent layers, fully utilizing radial space and simplifying the Busbar structure. Each layer of hairpin coil is independent of the others, with no additional cross-layer hairpin coils. Fully automated wire insertion can be achieved through independent spools, simplifying the manufacturing process and facilitating mass production.

[0287] The flat wire motor, powertrain, and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and embodiments of this application. The description of the embodiments above is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in specific embodiments and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A flat wire motor, characterized by, The flat wire motor is used for receiving driving of three-phase alternating current, the three-phase alternating current includes first phase alternating current, second phase alternating current and third phase alternating current, the motor stator of the flat wire motor includes multiple groups of winding slots, each group of winding slots includes multiple winding slots arranged in sequence along the circumference of the flat wire motor, each winding slot is used for accommodating multiple flat wires, and multiple winding slots adjacent in sequence constitute a group of winding slots, and each group of winding slots includes: A first winding slot, all the flat wires accommodated in the first winding slot are used for transmitting the first phase alternating current in the three-phase alternating current; Multiple second winding slots, the multiple second winding slots are arranged on one side of the first winding slot along the circumference of the flat wire motor, a part of the flat wires in each second winding slot are used for transmitting the first phase alternating current, and the remaining flat wires in each second winding slot are used for transmitting the second phase alternating current, and the number of the flat wires used for transmitting the first phase alternating current in any second winding slot is not equal to the difference between the number of the flat wires used for transmitting the first phase alternating current in two adjacent second winding slots; Multiple third winding slots, the number of the multiple third winding slots is same as that of the multiple second winding slots, the multiple third winding slots are arranged on the other side of the first winding slot along the circumference of the flat wire motor, a part of the flat wires in each third winding slot are used for transmitting the first phase alternating current, and the remaining flat wires in each third winding slot are used for transmitting the third phase alternating current, and the number of the flat wires used for transmitting the first phase alternating current in any third winding slot is not equal to the difference between the number of the flat wires used for transmitting the first phase alternating current in two adjacent third winding slots.

2. The flat wire motor according to claim 1, characterized in that The number of the flat wires used for transmitting the first phase alternating current in the multiple second winding slots in each group of winding slots decreases in the counterclockwise direction; The number of the flat wires used for transmitting the first phase alternating current in the multiple third winding slots in each group of winding slots increases in the counterclockwise direction.

3. Flat wire motor according to claim 1 or 2, characterized in that The number of the flat wires used for transmitting the first phase alternating current in the multiple second winding slots in each group of winding slots decreases in the counterclockwise direction is greater than the number of the flat wires used for transmitting the second phase alternating current in one second winding slot adjacent to the first winding slot; The number of the flat wires used for transmitting the first phase alternating current in the multiple third winding slots in each group of winding slots increases in the counterclockwise direction is greater than the number of the flat wires used for transmitting the third phase alternating current in one third winding slot adjacent to the first winding slot.

4. A flat wire motor according to any one of claims 1-3, characterized in that The number of the flat wires used for transmitting the first phase alternating current in the multiple second winding slots in each group of winding slots decreases by 2 in the counterclockwise direction, and the number of the flat wires used for transmitting the first phase alternating current in the multiple third winding slots in each group of winding slots increases by 2 in the counterclockwise direction;Or The number of flat wires for transmitting the first-phase alternating current in each of the plurality of second winding slots in each group of winding slots decreases by 3 in the counterclockwise direction; the number of flat wires for transmitting the first-phase alternating current in each of the plurality of third winding slots in each group of winding slots increases by 3 in the counterclockwise direction.

5. A flat wire motor according to any one of claims 1-4, characterized in that The flat wires for transmitting the first-phase alternating current in each of the second winding slots are arranged in sequence along the radial direction of the flat wire motor, and the flat wires for transmitting the second-phase alternating current in each of the second winding slots are arranged in sequence along the radial direction of the flat wire motor, wherein: The distance between any one of the flat wires for transmitting the first-phase alternating current in each of the second winding slots and the axis of the flat wire motor is less than the distance between any one of the flat wires for transmitting the second-phase alternating current in each of the second winding slots and the axis of the flat wire motor.

6. A flat wire motor according to any one of claims 1-5, characterized in that The flat wires for transmitting the first-phase alternating current in each of the third winding slots are arranged in sequence along the radial direction of the flat wire motor, and the flat wires for transmitting the third-phase alternating current in each of the third winding slots are arranged in sequence along the radial direction of the flat wire motor, wherein: The distance between any one of the flat wires for transmitting the first-phase alternating current in each of the third winding slots and the axis of the flat wire motor is greater than the distance between any one of the flat wires for transmitting the third-phase alternating current in each of the third winding slots and the axis of the flat wire motor.

7. A flat wire motor according to any one of claims 1-6, characterized in that One second winding slot and one third winding slot are arranged on both sides of the one first winding slot, the number of winding slots between the one second winding slot and the one first winding slot is the same as the number of winding slots between the one third winding slot and the one first winding slot, or the one second winding slot and the one third winding slot are adjacent to the one first winding slot, wherein: The number of flat wires for transmitting the first-phase alternating current in the one second winding slot is equal to the number of flat wires for transmitting the first-phase alternating current in the one third winding slot; The number of flat wires for transmitting the second-phase alternating current in the one second winding slot is equal to the number of flat wires for transmitting the third-phase alternating current in the one third winding slot.

8. A flat wire motor according to any one of claims 1-7, characterized in that The number of flat wires for transmitting the second-phase alternating current in one of the plurality of second winding slots adjacent to the one first winding slot in each group of winding slots is equal to the number of flat wires for transmitting the first-phase alternating current in one of the plurality of second winding slots farthest from the one first winding slot in each group of winding slots; The number of flat wires for transmitting the third-phase alternating current in one of the plurality of third winding slots adjacent to the one first winding slot in each group of winding slots is equal to the number of flat wires for transmitting the first-phase alternating current in one of the plurality of third winding slots farthest from the one first winding slot in each group of winding slots.

9. A flat wire motor according to any of claims 1-8, characterized in that All the flat wires accommodated by the multiple groups of winding slots are divided into multiple turns of the flat wires arranged along the radial direction of the flat wire motor, each turn of the flat wires is divided into multiple groups of the flat wires arranged along the circumferential direction of the flat wire motor, four groups of the flat wires arranged adjacently are used for transmitting one of the first-phase alternating current, the second-phase alternating current and the third-phase alternating current, each group of the flat wires comprises at least one flat wire accommodated in a same winding slot, wherein: The number of the flat wires in each group of the flat wires in at least one turn of the flat wires and a turn of the flat wires adjacent to the at least one turn is different.

10. The flat wire motor of claim 9, wherein The multiple turns of the flat wires comprise a first turn of the flat wires and an Nth turn of the flat wires, the distance between any flat wire in the first turn of the flat wires and the axis of the flat wire motor is greater than the distance between any flat wire in the multiple turns of the flat wires except the first turn of the flat wires and the axis of the flat wire motor, the distance between any flat wire in the Nth turn of the flat wires and the axis of the flat wire motor is less than the distance between any flat wire in the multiple turns of the flat wires except the Nth turn of the flat wires and the axis of the flat wire motor, wherein: The number of the flat wires in each group of the flat wires in the first turn of the flat wires is the same as the number of the flat wires in each group of the flat wires in the Nth turn of the flat wires; The number of the flat wires in each group of the flat wires in any turn of the flat wires between the first turn of the flat wires and the Nth turn of the flat wires is greater than the number of the flat wires in each group of the flat wires in the first turn of the flat wires.

11. A flat wire motor according to any of claims 1-10, characterized in that Each group of the winding slots is composed of seven winding slots in turn, the number of the second winding slots is three, each winding slot is used for accommodating six flat wires, the difference between the number of the flat wires used for transmitting the first-phase alternating current in the two second winding slots adjacent to each other in each group of the winding slots is two, and the number of the flat wires used for transmitting the first-phase alternating current in the second winding slot adjacent to the first winding slot is one.

12. A flat wire motor according to any of claims 1-11, characterized in that Each group of the winding slots is composed of seven winding slots in turn, the number of the second winding slots is three, each winding slot is used for accommodating ten flat wires, the difference between the number of the flat wires used for transmitting the first-phase alternating current in the two second winding slots adjacent to each other in each group of the winding slots is three, and the number of the flat wires used for transmitting the first-phase alternating current in the second winding slot adjacent to the first winding slot is two.

13. A flat wire motor according to any of claims 1-11, characterized in that Each group of the winding slots is composed of seven winding slots in turn, the number of the second winding slots is three, each winding slot is used for accommodating L flat wires, the number of the flat wires used for transmitting the first-phase alternating current in each second winding slot is not equal to an integer multiple of L / 4, and the number of the flat wires used for transmitting the third-phase alternating current in each third winding slot is not equal to an integer multiple of L / 4.

14. A powertrain, characterized by, The power assembly comprises a reducer and the flat wire motor according to any one of claims 1-13, the motor shaft of the flat wire motor is used for driving connection with the input shaft of the reducer, and the output shaft of the reducer is used for driving the wheels of the electric vehicle.

15. An electric vehicle, characterized by The electric vehicle includes a frame, a power battery, and a powertrain as described in claim 14. The frame is used to fix the power battery and the powertrain. The power battery is used to supply power to the motor, and the motor is used to drive the wheels of the electric vehicle through the reducer.

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