Flat wire motor, power assembly and electric vehicle

Abstract

The invention provides a flat wire motor, a power assembly and an electric vehicle, a 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, and all flat wires accommodated in a first winding slot in each group of winding slots are used for transmitting first-phase alternating current in three-phase alternating current. The flat wires in the second winding grooves are used for transmitting the first phase alternating current or the second phase alternating current, and the number of the flat wires used for transmitting the first phase alternating current in the second winding grooves is not equal to the difference value of the number of the flat wires used for transmitting the first phase alternating current in every two adjacent second winding grooves. The flat wires in the third winding grooves are used for transmitting the first phase alternating current or the third phase alternating current, and the number of the flat wires used for transmitting the first phase alternating current in the third winding grooves is not equal to the difference value of the number of the flat wires used for transmitting the first phase alternating current in every two adjacent third winding grooves. Therefore, the connection of the cross-layer flat wire for transmitting the in-phase alternating current has different spans, and the continuous short distance of the winding is realized, so that the harmonic magnetic field of the motor is weakened, and the NVH performance of the motor is improved.

Description

Technical Field

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

[0002] At present, the driving motors of new energy vehicles are mainly permanent magnet synchronous motors. In permanent magnet synchronous motors, the cross-sectional shape of the stator winding in the motor stator can be divided into round wire conductors and flat copper wire conductors. The motor using flat copper wire conductors is called a flat wire motor. The traditional round wire motor is affected by the automatic offline process, and it is difficult to achieve a short-pitch winding with three-phase balance, while the flat wire motor can effectively improve the full rate, power density and torque density. With the rapid development of the new energy vehicle industry, the requirements for the number of layers, the number of parallel branches and the winding form of the flat wire motor are getting higher and higher. At present, the winding method of the existing flat wire motor stator winding is mostly full-pitch winding. The flat wire motor with a full-pitch structure has a high harmonic winding coefficient, and the torque fluctuation is large during operation, which worsens the noise, vibration and acoustic roughness of the motor and reduces the performance of the motor. By setting the stator winding to a short-pitch winding to reduce the harmonic winding coefficient of the flat wire motor, the NVH performance of electric vehicles can be improved. However, the existing flat wire short-pitch winding with balanced multi-branch has a complex structure, which makes the winding processing difficult and winding difficult. In addition, the short-pitch setting method is limited by the winding form, making it difficult to effectively weaken the harmonic winding coefficient while obtaining a higher fundamental winding coefficient, thereby reducing the performance of the flat wire motor. Summary of the invention

[0003] The present application provides a flat wire motor, a power assembly and an electric vehicle.

[0004] In a first aspect, the present application provides a flat wire motor, which is used to receive the drive of three-phase alternating current, wherein the three-phase alternating current includes a first-phase alternating current, a second-phase alternating current and a third-phase alternating current, and 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 to accommodate 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, 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 alternating current in the three-phase alternating current. Multiple second winding slots are arranged on one side of a first winding slot along the circumference of the flat wire motor, a part of the flat wires in each second winding slot are used to transmit the first-phase alternating current, and the remaining flat wires in each second winding slot are used to transmit the second-phase alternating current, and the number of flat wires used to transmit the first-phase alternating current in any second winding slot is not equal to the difference between the number of flat wires used to transmit the first-phase alternating current in two adjacent second winding slots. The number of the plurality of third winding slots is the same as the number of the plurality of second winding slots. The plurality of third winding slots are arranged along the circumferential direction of the flat wire motor on 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 alternating current, and the remaining flat wires in each third winding slot are used to transmit the third-phase alternating current. The number of flat wires used to transmit the first-phase alternating current in any third winding slot is not equal to the difference in the number of flat wires used to transmit the first-phase alternating current in two adjacent third winding slots.

[0005] In an embodiment of the present application, a plurality of second winding slots are arranged on one side of a first winding slot along the circumference of the flat wire motor, a portion of the flat wires in each second winding slot are used to transmit the first phase alternating current, and the remaining flat wires in each second winding slot are used to transmit the second phase alternating current, so that the plurality of flat wires in the plurality of second winding slots can be used not only to transmit the first phase alternating current, but also to transmit the second phase alternating current, so that the connection of the flat wires in the winding slots can form a short-distance winding, which is conducive to weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor. The number of flat wires used to transmit the first phase alternating current in any second winding slot is not equal to the difference between the number of flat wires used to transmit the first phase alternating current in two adjacent second winding slots, so that the arrangement of the flat wires belonging to the same phase alternating current in the winding slot has more options, which is conducive to making the connection between the cross-layer flat wires have different spans, so that the winding achieves a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0006] In an embodiment of the present application, the number of multiple third winding slots is the same as the number of multiple second winding slots, and the multiple third winding slots are arranged along the circumference of the flat wire motor on the other side of a first winding slot, so that the arrangement of the flat wires of each phase in the winding slot is more regular, the winding routing is more regular, and the appearance is more beautiful.

[0007] In an embodiment of the present application, a portion of the flat wires in each third winding slot are used to transmit the first phase of alternating current, and the remaining flat wires in each third winding slot are used to transmit the third phase of alternating current, so that the multiple flat wires in multiple third winding slots can be used not only to transmit the first phase of alternating current, but also to transmit the third phase of alternating current, so that the connection of the flat wires in the winding slots can form a short-distance winding, which is beneficial to weaken the harmonic magnetic field of the flat wire motor and improve the NVH performance of the flat wire motor. The number of flat wires used to transmit the first phase of alternating current in any third winding slot is not equal to the difference in the number of flat wires used to transmit the first phase of alternating current in two adjacent third winding slots, so that the arrangement of the flat wires belonging to the same phase of alternating current in the winding slot has more options, which is beneficial to make the connection between the cross-layer flat wires have different spans, so that the winding achieves a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

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

[0009] In the embodiment of the present application, the number of flat wires used to transmit the first phase AC in the plurality of second winding slots in each group of winding slots decreases in the counterclockwise direction, and the number of flat wires used to transmit the second phase AC in the plurality of second winding slots increases in the counterclockwise direction accordingly, so that the windings used to transmit the first phase AC and the second phase AC are arranged in a regular manner, making the appearance of the motor stator more beautiful. It is also beneficial to form a continuous short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0010] In the embodiment of the present application, the number of flat wires used to transmit the first phase AC in the third winding slots of each group of winding slots increases in the counterclockwise direction, and the number of flat wires used to transmit the third phase AC in the third winding slots decreases in the counterclockwise direction accordingly, so that the windings used to transmit the first phase AC and the third phase AC are arranged in a regular manner, making the appearance of the motor stator more beautiful. It is also beneficial to form a continuous short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0011] In one embodiment, the number of flat wires for transmitting the first phase AC in the plurality of second winding slots in each group of winding slots is reduced in a counterclockwise direction by a greater number than the number of flat wires for transmitting the second phase AC in a second winding slot adjacent to a first winding slot. The number of flat wires for transmitting the first phase AC in the plurality of third winding slots in each group of winding slots is increased in a counterclockwise direction by a greater number than the number of flat wires for transmitting the third phase AC in a third winding slot adjacent to a first winding slot.

[0012] In an embodiment of the present application, the number of flat wires used to transmit the first phase alternating current in the multiple second winding slots in each group of winding slots that decreases in a counterclockwise direction is greater than the number of flat wires used to transmit the second phase alternating current in a second winding slot adjacent to a first winding slot, so that the flat wires used to transmit the first phase alternating current and the second phase alternating current in the second winding slot have more cross-wire modes when connected with the flat wires in other groups of winding slots, which is conducive to forming a continuous short-distance winding, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0013] In an embodiment of the present application, the number of flat wires used to transmit the first phase alternating current in multiple third winding slots in each group of winding slots increases counterclockwise and is greater than the number of flat wires used to transmit the third phase alternating current in a third winding slot adjacent to a first winding slot, so that the flat wires used to transmit the first phase alternating current and the third phase alternating current in the third winding slot have more cross-wire modes when connected with the flat wires in other groups of winding slots, which is conducive to forming a continuous short-distance winding, 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 to transmit 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 flat wires used to transmit the first-phase alternating current in the multiple third winding slots in each group of winding slots increases by 2 in the counterclockwise direction. Alternatively, the number of flat wires used to transmit the first-phase alternating current in the multiple second winding slots in each group of winding slots decreases by 3 in the counterclockwise direction, and the number of flat wires used to transmit the first-phase alternating current in the multiple third winding slots in each group of winding slots increases by 3 in the counterclockwise direction.

[0015] In an embodiment of the present application, the number of flat wires used to transmit 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 flat wires used to transmit the first-phase alternating current in the multiple third winding slots in each group of winding slots increases by 2 in the counterclockwise direction, so that the arrangement of the flat wires of the three-phase alternating current in the winding slots is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful.

[0016] In an embodiment of the present application, the number of flat wires used to transmit the first-phase alternating 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 to transmit the first-phase alternating current in the multiple third winding slots of each group of winding slots increases by 3 in the counterclockwise direction, so that the arrangement of the flat wires of the three-phase alternating current in the winding slots is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful.

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

[0018] In an embodiment of the present application, the flat wires used to transmit the first-phase alternating current in each second winding slot are arranged adjacent to each other in the radial direction of the flat wire motor, and the flat wires used to transmit the second-phase alternating current in each second winding slot are arranged adjacent to each other in the radial direction of the flat wire motor, which is beneficial for arranging the flat wires transmitting the first-phase alternating current and the second-phase alternating current relatively concentratedly, and is beneficial for the arrangement of the phase belts in the flat wire motor.

[0019] In an embodiment of the present application, the distance between any flat wire used to transmit the first-phase alternating current in each second winding slot and the axis of the flat wire motor is smaller than the distance between any flat wire used to transmit the second-phase alternating current in each second winding slot and the axis of the flat wire motor, that is, the flat wire used to transmit the second-phase alternating current 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 alternating current.

[0020] In one embodiment, the flat wires used to transmit the first-phase alternating current in each third winding slot are arranged adjacent to each other in the radial direction of the flat wire motor, and the flat wires used to transmit the third-phase alternating current in each third winding slot are arranged adjacent to each other in the radial direction of the flat wire motor. The distance between any flat wire used to transmit the first-phase alternating current 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 alternating current in each third winding slot and the axis of the flat wire motor.

[0021] In an embodiment of the present application, the flat wires used to transmit the first-phase alternating current in each third winding slot are arranged adjacent to each other in radial direction of the flat wire motor, and the flat wires used to transmit the third-phase alternating current in each third winding slot are arranged adjacent to each other in radial direction of the flat wire motor, which is beneficial for arranging the flat wires transmitting the first-phase alternating current and the third-phase alternating current relatively concentratedly, and is beneficial for the arrangement of the phase belts in the flat wire motor.

[0022] In an embodiment of the present application, the distance between any flat wire used to transmit the first-phase alternating current 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 alternating current in each third winding slot and the axis of the flat wire motor, that is, the flat wire used to transmit the third-phase alternating current 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 alternating current.

[0023] In one embodiment, a second winding slot and a third winding slot are arranged on both sides of a first winding slot, and the number of winding slots between a second winding slot and a first winding slot is the same as the number of winding slots between a third winding slot and a first winding slot, or a second winding slot and a third winding slot are adjacent to a first winding slot. The number of flat wires used to transmit the first-phase alternating current in a second winding slot is equal to the number of flat wires used to transmit the first-phase alternating current in a third winding slot. The number of flat wires used to transmit the second-phase alternating current in a second winding slot is equal to the number of flat wires used to transmit the third-phase alternating current in a third winding slot.

[0024] In the embodiment of the present application, the number of flat wires used to transmit the first phase AC in a second winding slot is equal to the number of flat wires used to transmit the first phase AC in a third winding slot, and the number of flat wires used to transmit the second phase AC in a second winding slot is equal to the number of flat wires used to transmit the third phase AC in a third winding slot, so that the arrangement of the flat wires used to transmit each phase AC is regular, thereby making the winding routing regular, which is conducive to making the appearance of the motor stator more beautiful. It is also conducive to the automation of the motor stator winding, simplifying the production process, and improving production efficiency.

[0025] In one embodiment, the number of flat wires used to transmit the second-phase alternating current in a second winding slot adjacent to a first winding slot among the plurality of second winding slots in each group of winding slots is equal to the number of flat wires used to transmit the first-phase alternating current in a second winding slot farthest from a first winding slot among the plurality of second winding slots in each group of winding slots. The number of flat wires used to transmit the third-phase alternating current in a third winding slot adjacent to a first winding slot among the plurality of third winding slots in each group of winding slots is equal to the number of flat wires used to transmit the first-phase alternating current in a third winding slot farthest from a first winding slot among the plurality of third winding slots in each group of winding slots.

[0026] In the embodiment of the present application, the flat wires used to transmit the first-phase alternating current and the second-phase alternating current in the plurality of second winding slots are arranged in a regular pattern, and the flat wires used to transmit the first-phase alternating current and the third-phase alternating current in the plurality of third winding slots are arranged in a regular pattern, so that the arrangement of the flat wires used to transmit each phase of alternating current is more regular, which is conducive to making the routing of the winding more regular and the appearance of the motor stator more beautiful. It is also conducive to the automation of the winding of the motor stator winding, simplifying the production process and improving the production efficiency.

[0027] In one embodiment, all the flat wires contained in the plurality of groups of winding slots are divided into a plurality of turns of flat wires arranged along the radial direction of the flat wire motor, each turn of flat wires is divided into a plurality of groups of flat wires arranged along the circumferential direction of the flat wire motor, the four adjacent groups of flat wires are used to transmit one of the first phase alternating current, the second phase alternating current and the third phase alternating current, and each group of flat wires includes at least one flat wire contained in the same winding slot. The number of flat wires in each group of at least one turn of flat wires and one turn of flat wires adjacent thereto is different.

[0028] In the embodiment of the present application, the number of flat wires in each group of at least one circle of flat wires and the adjacent circle of flat wires is different, so that the winding can achieve a short distance effect, which is beneficial to reduce the harmonic winding coefficient of the flat wire motor and improve the NVH performance of the flat wire motor. It can also increase the diversity of the number of turns of the winding in series, which is beneficial to improve the performance of the motor.

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

[0030] In the embodiment of the present application, the distance between any flat wire in the first circle of flat wire and the axis of the flat wire motor is greater than the distance between any flat wire in the multiple circles of flat wire except the first circle of flat wire and the axis of the flat wire motor, that is, the first circle of flat wire refers to a circle of flat wire located at the bottom of the slot in the winding slot. The distance between any flat wire in the Nth circle of flat wire and the axis of the flat wire motor is less than the distance between any flat wire in the multiple circles of flat wire except the Nth circle of flat wire and the axis of the flat wire motor, that is, the Nth circle of flat wire refers to a circle of flat wire located at the notch in the winding slot.

[0031] In an embodiment of the present application, the number of flat wires in each group of the first circle of flat wires is the same as the number of flat wires in each group of the Nth circle of flat wires, so that the arrangement of multiple circles of flat wires is more regular, which is conducive to making the routing of the winding more regular, thereby making the appearance of the motor stator more beautiful.

[0032] In an embodiment of the present application, the number of flat wires in each group of flat wires in any circle of flat wires between the first circle of flat wires and the Nth circle of flat wires is greater than the number of flat wires in each group of flat wires in the first circle of flat wires, thereby making the distribution of multiple circles of flat wires in the winding slots more diverse, and is also beneficial for the winding to achieve a continuous short-distance effect, which is beneficial to weakening the harmonic winding coefficient of the flat wire motor and improving the NVH performance of the flat wire motor.

[0033] In one embodiment, each group of winding slots is composed of 7 adjacent winding slots in sequence, 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 alternating current in two adjacent second winding slots in each group of winding slots is 2, and the number of flat wires used to transmit the first phase alternating current in a second winding slot adjacent to a first winding slot is 1.

[0034] In the embodiment of the present application, the difference in the number of flat wires used to transmit the first phase AC in two adjacent second winding slots in each group of winding slots is 2, so that the arrangement of the flat wires of the three-phase AC in the winding slots is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The difference in the number of flat wires used to transmit the first phase AC in two adjacent second winding slots in each group of winding slots is 2, and the number of flat wires used to transmit the first phase AC in a second winding slot adjacent to a first winding slot is 1, so that the winding can achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0035] In one embodiment, each group of winding slots is composed of 7 adjacent winding slots in sequence, 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 alternating current in two adjacent second winding slots in each group of winding slots is 3, and the number of flat wires used to transmit the first phase alternating current in a second winding slot adjacent to a first winding slot is 2.

[0036] In the embodiment of the present application, the difference in the number of flat wires used to transmit the first phase AC in two adjacent second winding slots in each group of winding slots is 3, so that the arrangement of the flat wires of the three-phase AC in the winding slots is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The difference in the number of flat wires used to transmit the first phase AC in two adjacent second winding slots in each group of winding slots is 3, and the number of flat wires used to transmit the first phase AC in a second winding slot adjacent to a first winding slot is 2, so that the winding can achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0037] In one embodiment, each group of winding slots is composed of 7 adjacent winding slots in sequence, 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 alternating 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 alternating current in each third winding slot is not equal to an integer multiple of L / 4.

[0038] In the embodiment of the present application, the number of flat wires used to transmit the first-phase alternating current in each second winding slot is not equal to an integer multiple of L / 4, so that the arrangement of the flat wires of the three-phase alternating current in the winding slot is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The number of flat wires used to transmit the third-phase alternating current in each third winding slot is not equal to an integer multiple of L / 4, so that the winding can achieve a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor and improving the NVH performance of the flat wire motor.

[0039] In a second aspect, the present application provides a power assembly, which includes a reducer and a flat wire motor as in the first aspect, wherein the motor shaft of the flat wire motor is used for transmission connection to the input shaft of the reducer, and the output shaft of the reducer is used for driving the wheels of the electric vehicle.

[0040] In the flat wire motor in the embodiment of the present application, the motor stator of the flat wire motor makes the number of flat wires used to transmit the first phase alternating current in any second winding slot not equal to the difference in the number of flat wires used to transmit the first phase alternating current in two adjacent second winding slots, and the number of flat wires used to transmit the first phase alternating current in any third winding slot not equal to the difference in the number of flat wires used to transmit the first phase alternating current in two adjacent third winding slots, so that the connections between the cross-layer flat wires used to transmit the same-phase alternating current have different spans, so that the winding achieves a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor, improving the NVH performance of the flat wire motor, and further enhancing the NVH performance of the powertrain.

[0041] In a third aspect, the present application provides an electric vehicle, comprising a frame, a power battery and a power assembly as in the second aspect, wherein the frame is used to fix the power battery and the power assembly, the power battery is used to power a motor, and the motor is used to drive the wheels of the electric vehicle through a reducer.

[0042] The powertrain in the embodiment of the present application includes a flat wire motor. The motor stator of the flat wire motor makes the number of flat wires used to transmit the first phase alternating current in any second winding slot not equal to the difference in the number of flat wires used to transmit the first phase alternating current in two adjacent second winding slots, and the number of flat wires used to transmit the first phase alternating current in any third winding slot not equal to the difference in the number of flat wires used to transmit the first phase alternating current in two adjacent third winding slots. This makes the connections between the cross-layer flat wires used to transmit the same-phase alternating current have different spans, so that the winding achieves a continuous short-distance effect, thereby weakening the harmonic magnetic field of the flat wire motor, improving the NVH performance of the flat wire motor, and then improving the NVH performance of the powertrain, thereby improving the overall performance of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments of the present application will be described below.

[0044] Figure 1 is a schematic diagram of the structure of an electric vehicle provided in an embodiment of the present application;

[0045] Figure 2 is a schematic diagram of the structure of a powertrain provided in an embodiment of the present application;

[0046] Figure 3 It is a schematic diagram of a top view of a structure in which a flat wire is inserted into a winding slot provided in an embodiment of the present application;

[0047] Figure 4 It is a structural schematic diagram of a card issuing coil provided in an embodiment of the present application;

[0048] Figure 5 is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application;

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

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

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

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

[0055] 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;

[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 is a connection diagram of a third parallel branch of a U-phase winding provided in another embodiment of the present application;

[0058] 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;

[0059] 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;

[0060] Fig. 9 is a connection diagram of a first parallel branch of a U-phase winding provided by another embodiment of the present application;

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

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

[0063] Fig.10 is a connection diagram of a second parallel branch of a U-phase winding provided by another embodiment of the present application;

[0064] Fig.10a yes Fig.10 An enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding;

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

[0066] Fig.11 is a connection diagram of a first parallel branch of a U-phase winding provided in yet another embodiment of the present application;

[0067] Fig.11a yes Fig.11 An enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding;

[0068] Fig.11b yes Fig.11 An enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding;

[0069] Fig.12 is a connection diagram of a second parallel branch of a U-phase winding provided in yet another embodiment of the present application;

[0070] Fig.12a yes Fig.12 An enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding;

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

[0072] Fig.13 is a connection diagram of a third parallel branch of a U-phase winding provided in yet another embodiment of the present application;

[0073] Fig.13a yes Fig.13 An enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding;

[0074] Fig.13b yes Fig.13 An enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding;

[0075] Fig.14 It is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application;

[0076] Fig.15 is another connection schematic diagram of the three-phase winding ends provided in an embodiment of the present application;

[0077] Fig.16 It is a torque pulsation comparison diagram of the winding peak operating point in Example 1 of the present application. DETAILED DESCRIPTION

[0078] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0079] For ease of understanding, the English abbreviations and related technical terms involved in the embodiments of the present application are explained and described below.

[0080] NVH: It is the abbreviation of Noise, Vibration and Harshness, which refers to noise, vibration and acoustic roughness.

[0081] Busbar: It is a multi-layer composite structure connection bar, which can be regarded as the core channel of the power distribution system. Compared with the traditional wiring method, it has significant advantages such as convenient design, low impedance, strong anti-interference ability, high reliability, good space utilization and quick assembly.

[0082] Number of poles: the number of magnetic poles of the motor. The magnetic poles are divided into N poles and S poles. Generally, one N pole and one S pole are called a pair of magnetic poles, that is, the number of pole pairs is 1. Therefore, if the number of pole pairs of the motor is 1, 2, 3, or 4, then the number of poles of the motor is 2, 4, 6, or 8.

[0083] Pole pitch: The pole pitch of the winding refers to the distance of the circular surface occupied by each magnetic pole. For AC motors, it refers to the slot distance occupied by each magnetic pole along the inner circle of the stator core. Expressed in 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, that is, f=z / 2p.

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

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

[0086] Phase belt: The conductors under each pole are evenly distributed to each phase. The range occupied by each phase winding under each pole face is expressed in electrical angles and is called phase belt.

[0087] In addition, the winding methods of the stator winding include full-pitch winding and short-pitch winding, wherein the full-pitch winding refers to the pitch of the stator winding being equal to the pole pitch, and the short-pitch winding refers to the pitch of the stator winding being less than the pole pitch.

[0088] In order to weaken the harmonic magnetic field of the flat wire motor and improve the NVH performance of the flat wire motor, the present application provides a flat wire motor for receiving a three-phase alternating current drive, the three-phase alternating current includes a first-phase alternating current, a second-phase alternating current and a 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 to accommodate multiple flat wires, and multiple winding slots adjacent in sequence constitute a group of winding slots, each group of winding slots includes a first winding slot, multiple second winding slots and multiple third winding slots. All flat wires accommodated in a first winding slot are used to transmit the first phase of the three-phase alternating current. A plurality of second winding slots are arranged on one side of a first winding slot along the circumferential direction of the flat wire motor, a portion of the flat wires in each second winding slot are used to transmit the first phase alternating current, the remaining flat wires in each second winding slot are used to transmit the second phase alternating current, and the number of flat wires used to transmit the first phase alternating current in any second winding slot is not equal to the difference between the number of flat wires used to transmit the first phase alternating current in two adjacent second winding slots. The number of a plurality of third winding slots is the same as the number of a plurality of second winding slots, and a plurality of third winding slots are arranged on the other side of a first winding slot along the circumferential direction of the flat wire motor, a portion of the flat wires in each third winding slot are used to transmit the first phase alternating current, the remaining flat wires in each third winding slot are used to transmit the third phase alternating current, and the number of flat wires used to transmit the first phase alternating current in any third winding slot is not equal to the difference between the number of flat wires used to transmit the first phase alternating current in two adjacent third winding slots. By making the number of flat wires used to transmit the first phase AC in any second winding slot not equal to the difference in the number of flat wires used to transmit the first phase AC in two adjacent second winding slots, and the number of flat wires used to transmit the first phase AC in any third winding slot not equal to the difference in the number of flat wires used to transmit the first phase AC in two adjacent third winding slots, the connections between the cross-layer flat wires used to transmit the same-phase AC have different spans, so that the winding achieves a continuous short-distance 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 It is a schematic diagram of the structure of the electric vehicle 1 provided in an embodiment of the present 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 power assembly 10 and the power battery 30 are fixed to the frame 20. The power assembly 10 is used to receive power from the power battery 30 and to drive the wheel 40. In the embodiment of the present application, the power battery 30 may also be referred to as a battery pack. In the embodiment of the present application, the frame 20 may also be referred to as a vehicle body. In the embodiment of the present application, the electric vehicle 1 refers to a wheeled device driven or towed by a power device.

[0091] Figure 2It is a schematic diagram of the structure of the powertrain 10 provided in an embodiment of the present application.

[0092] In one embodiment, the power assembly 10 includes a flat wire motor 100 and a reducer 200. Figure 2 As shown, the flat wire motor 100 includes a motor shaft (not shown), a motor stator and a motor rotor (not shown), and the reducer 200 includes a gear assembly (not shown), an input shaft (not shown) and an output shaft (not shown), wherein the input shaft receives the power transmitted by 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 set as required, and can be a single-speed reduction gear assembly, a two-speed or multi-speed reduction gear assembly. The motor rotor is fixedly sleeved on the motor shaft, and the motor stator drives the motor rotor to rotate after receiving alternating current, thereby driving the motor shaft to rotate. The motor shaft of the flat wire motor 100 is used to be connected to the input shaft of the reducer 200 in a transmission manner, thereby driving the wheels 40 of the electric vehicle 1 to travel.

[0093] In the embodiment of the present application, 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 power assembly 10 further includes a motor controller 300 , which is used to convert the direct current output by the power battery 30 into alternating current, and provide the alternating current to power 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 winding processing difficult and winding difficult. The conventional short-pitch winding method is limited by the winding form, and it is difficult to effectively weaken the harmonic winding coefficient while obtaining a higher fundamental winding coefficient, which reduces the performance of the flat wire motor. In addition, there are few short-pitch windings with 4 slots per pole per phase, and the existing design schemes are difficult to achieve continuous short pitch, and the application range is not wide.

[0096] The present application provides a flat wire motor that can be suitable for odd-numbered and even-numbered windings, and can achieve a continuous short-distance effect for a flat wire winding with 4 slots per pole per phase, while maximizing and simultaneously weakening 6p and 12p harmonics, reducing winding AC losses and simplifying the winding insertion process.

[0097] The flat wire motor 100 provided in an embodiment of the present application will be described in detail below.

[0098] Figure 3 1 is a schematic top view of the structure in which the flat wire 120 provided in the embodiment of the present application is inserted into the winding slot 110. Figure 4 is a schematic diagram of the structure of the card issuing coil 130 provided in an embodiment of the present application, Figure 5is a connection diagram of two parallel branches of a U-phase winding provided in an embodiment of the present application, Figure 5a yes Figure 5 The enlarged diagram of the left half of the connection diagram of the two parallel branches of the U-phase winding in FIG. Figure 5b yes Figure 5 The enlarged diagram of the right half of the connection diagram of the two parallel branches of the U-phase winding in FIG. Figure 6 is a connection diagram of a first parallel branch of a U-phase winding provided in another embodiment of the present application, Figure 6a yes Figure 6 The enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding in FIG. Figure 6b yes Figure 6 The enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding in FIG. Figure 7 is a connection diagram of a second parallel branch of a U-phase winding provided in another embodiment of the present application, Figure 7a yes Figure 7 The 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 The enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding, Figure 8 is a connection diagram of the third parallel branch of the U-phase winding provided in another embodiment of the present application, Figure 8a yes Figure 8 The 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 The enlarged view of the right half of the connection diagram of the third parallel branch of the U-phase winding. Fig. 9 is a connection diagram of the first parallel branch of the U-phase winding provided by another embodiment of the present application, Figure 9a yes Fig. 9 The enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding, Figure 9b yes Fig. 9 The enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding, Fig.10 is a connection diagram of the second parallel branch of the U-phase winding provided by another embodiment of the present application, Fig.10a yes Fig.10 The enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding, Fig.10b yes Fig.10 The enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding, Fig.11 is a connection diagram of the first parallel branch of the U-phase winding provided in yet another embodiment of the present application, Fig.11a yes Fig.11 The enlarged view of the left half of the connection diagram of the first parallel branch of the U-phase winding, Fig.11byes Fig.11 The enlarged view of the right half of the connection diagram of the first parallel branch of the U-phase winding, Fig.12 is a connection diagram of a second parallel branch of a U-phase winding provided in yet another embodiment of the present application, Fig.12a yes Fig.12 The enlarged view of the left half of the connection diagram of the second parallel branch of the U-phase winding, Figure 12b yes Fig.12 The enlarged view of the right half of the connection diagram of the second parallel branch of the U-phase winding, Fig.13 is a connection diagram of the third parallel branch of the U-phase winding provided in yet another embodiment of the present application, Fig.13a yes Fig.13 The enlarged view of the left half of the connection diagram of the third parallel branch of the U-phase winding. Fig.13b yes Fig.13 An enlarged view of the right half of the connection schematic diagram of the third parallel branch of the U-phase winding.

[0099] In one embodiment, the motor stator of the flat wire motor 100 includes a stator core and a stator winding. Figure 3 As shown, the stator core includes a plurality of winding slots 110. The number of the plurality of winding slots 110 may be a multiple of 6. In one embodiment, the number of the winding slots 110 is 72. The plurality of winding slots 110 are arranged on the inner wall of the stator core and are evenly arranged along the circumferential direction of the inner wall of the stator core. Any winding slot 110 extends in the axial direction of the stator core and passes through the inner wall of the stator core along the axial direction of the stator core.

[0100] In one embodiment, the motor stator of the flat wire motor 100 includes a flat wire 120 inserted into a winding slot 110, and the cross section of the flat wire 120 may be rectangular. The flat wires 120 in all winding slots 110 are connected to form a stator winding. In one embodiment, the flat wire 120 is copper, and the flat wire 120 may also be called a conductor.

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

[0102] like Figure 3 and Figure 5a As shown, Figure 5a For example, in Figure 5aThe first column on the left is the layer number of the flat wire 120 in each winding slot 110. In one embodiment, L is 6, that is, each winding slot 110 is provided with 6 layers of flat wire 120, and the 6 layers of flat wire 120 are respectively recorded as L1 layer flat wire, L2 layer flat wire, L3 layer flat wire, L4 layer flat wire, L5 layer flat wire, and L6 layer flat wire, wherein L1 layer flat wire is the flat wire 120 located at the bottom of the winding slot 110, and L6 layer flat wire is the flat wire 120 located at the notch 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, which are the first phase winding, the second phase winding and the third phase winding, which correspond to the U phase winding, the V phase winding and the W phase winding respectively. The first phase winding, the second phase winding and the third phase winding are used to transmit the first phase alternating current, the second phase alternating current and the third phase alternating 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 in sequence along the inner wall of the stator core. Among them, each phase unit of each phase winding is a pole phase, and the number of 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, and the adjacent phase bands 140 of the same phase unit are offset by one winding slot 110. All the flat wires 120 in each phase band 140 with the same offset in the three-phase winding form a circle of flat wires 120, for example, Figures 5 to 8b As shown, the L1-layer flat wires in the 25th, 26th, 27th, and 28th slots of the U-phase winding constitute a phase belt 140 of the U-phase winding, the L2-layer flat wires and the L3-layer flat wires in the 24th, 25th, 26th, and 27th slots constitute a phase belt 140, the L4-layer flat wires and the L5-layer flat wires in the 23rd, 24th, 25th, and 26th slots constitute a phase belt 140, and the L6-layer flat wires in the 22nd, 23rd, 24th, and 25th slots constitute a phase belt 140, and the above four phase belts 140 constitute a phase unit of the U-phase. Among them, all L1-layer flat wires constitute a first circle of flat wires 120a, all L2-layer flat wires and the L3-layer flat wires constitute a second circle of flat wires 120b, all L4-layer flat wires and the L5-layer flat wires constitute a third circle of flat wires 120c, and all L6-layer flat wires constitute a fourth circle of flat wires 120d, which can also be called the Nth circle of flat wires 120n. Among them, 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. Among them, a flat wire 120 belonging to the same winding slot 110 in a phase band 140 of the U phase winding or multiple flat wires 120 arranged adjacently in sequence form a group of flat wires 1201, and each phase band 140 includes four groups of flat wires 1201.

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

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

[0107] like Figures 5 to 13b As shown, Figures 5 to 13b The first row of abscissas in the figure represents the slot number of the winding slot 110. In the embodiment of the present application, the winding slots 110 of the motor stator are numbered in sequence along the circumferential direction C of the flat wire motor, and each winding slot 110 corresponds to a slot number. In the embodiment of the present application, the span of the hairpin coil 130 refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 of the hairpin coil 130 are located. In the embodiment of the application, the span of the welding layer refers to the difference in slot numbers of the winding slots 110 where the two flat wires 120 connected by the two welding sections 133 are located.

[0108] In one embodiment, a flat wire motor 100 is used to receive a drive of three-phase alternating current, wherein the three-phase alternating current includes a first-phase alternating current, a second-phase alternating current, and a third-phase alternating current. The motor stator of the flat wire motor 100 includes a plurality of groups of winding slots 110a, each group of winding slots 110a includes a plurality of winding slots 110 arranged in sequence along the circumferential direction C of the flat wire motor 100, each winding slot 110 is used to accommodate a plurality of flat wires 120, and a plurality of winding slots 110 adjacent to each other in sequence constitute a group of winding slots 110a, each group of winding slots 110a includes a first winding slot 110b, a plurality of second winding slots 110c, and a plurality of 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. A plurality of second winding slots 110c are arranged on one side of a first winding slot 110b along the circumferential direction C of the flat wire motor 100, a portion of the flat wires 120 in each second winding slot 110c are used to transmit the first-phase alternating current, and the remaining flat wires 120 in each second winding slot 110c are used to transmit the second-phase alternating current, and the number of flat wires 120 used to transmit the first-phase alternating current in any second winding slot 110c is not equal to the difference in the number of flat wires 120 used to transmit the first-phase alternating current in two adjacent second winding slots 110c. The number of the plurality of third winding slots 110d is the same as the number of the plurality of second winding slots 110c. The plurality of 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 is used to transmit the first-phase alternating current, and the remaining flat wires 120 in each third winding slot 110d are used to transmit the third-phase alternating current. The number of flat wires 120 used to transmit the first-phase alternating current in any third winding slot 110d is not equal to the difference in the number of flat wires 120 used to transmit the first-phase alternating current in two adjacent third winding slots 110d.

[0109] In an embodiment of the present application, a plurality of second winding slots 110c are arranged on one side of a first winding slot 110b along the circumferential direction C of the flat wire motor 100, a portion of the flat wire 120 in each second winding slot 110c is used to transmit the first phase alternating current, and the remaining flat wires 120 in each second winding slot 110c are used to transmit the second phase alternating current, so that the plurality of flat wires 120 in the plurality of second winding slots 110c can be used not only to transmit the first phase alternating current, but also to transmit the second phase alternating current, so that the connection of the flat wire 120 in the winding slot 110 can form a short-distance winding, which is beneficial to weaken the harmonic magnetic field of the flat wire motor 100 and improve the NVH performance of the flat wire motor 100. The number of flat wires 120 used to transmit the first phase alternating current in any second winding slot 110c is not equal to the difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent second winding slots 110c, so that the arrangement of the flat wires 120 belonging to the same phase alternating current in the winding slot 110 has more options, which is conducive to making the connection between the cross-layer flat wires 120 have different spans, so that the winding can achieve a continuous short-distance 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 to transmit the first phase alternating current in the 12th slot is 5, the number of flat wires 120 used to transmit the first phase alternating current in the 11th slot is 3, the number of flat wires 120 used to transmit the first phase alternating current in the 10th slot is 1, the 10th slot and the 11th slot are adjacent, and the difference in the number of flat wires 120 used to transmit the first phase alternating current between the 10th slot and the 11th slot is 2, which is different from the number of flat wires 120 used to transmit the first phase alternating current in the 12th slot.

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

[0112] In the embodiment of the present application, the number of the plurality of third winding slots 110d is the same as the number of the plurality of second winding slots 110c, and the plurality of 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, so that the arrangement of the flat wires 120 of each phase in the winding slot 110 is more regular, the routing of the winding is more regular, and the appearance is more beautiful.

[0113] In an embodiment of the present application, a portion of the flat wires 120 in each third winding slot 110d is used to transmit the first phase alternating current, and the remaining flat wires 120 in each third winding slot 110d is used to transmit the third phase alternating current, so that the multiple flat wires 120 in multiple third winding slots 110d can be used not only to transmit the first phase alternating current, but also to transmit the third phase alternating current, so that the connection of the flat wires 120 in the winding slots 110 can form a short-distance winding, which is beneficial to weaken the harmonic magnetic field of the flat wire motor 100 and improve the NVH performance of the flat wire motor 100. The number of flat wires 120 used to transmit the first phase alternating current in any third winding slot 110d is not equal to the difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent third winding slots 110d, so that the arrangement of the flat wires 120 belonging to the same phase alternating current in the winding slot 110 has more options, which is conducive to making the connection between the cross-layer flat wires 120 have different spans, so that the winding can achieve a continuous short-distance 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, the number of flat wires 120 used to transmit the first phase alternating current in the 14th slot is 5, the number of flat wires 120 used to transmit the first phase alternating current in the 15th slot is 3, the number of flat wires 120 used to transmit the first phase alternating current in the 16th slot is 1, the 15th slot and the 16th slot are adjacent, and the difference in the number of flat wires 120 used to transmit the first phase alternating current between the 15th slot and the 16th slot is 2, which is different from the number of flat wires 120 used to transmit the first phase alternating current in the 12th slot.

[0115] like Figures 9 to 13b As shown, the number of flat wires 120 used to transmit the first phase alternating current in the 14th slot is 8, the number of flat wires 120 used to transmit the first phase alternating current in the 15th slot is 5, the number of flat wires 120 used to transmit the first phase alternating current in the 16th slot is 2, the 15th slot and the 16th slot are adjacent, and the difference in the number of flat wires 120 used to transmit the first phase alternating current in the 10th slot and the 11th slot is 3, which is different from the number of flat wires 120 used to transmit the first phase alternating current in the 12th slot.

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

[0117] In the embodiment of the present application, the number of flat wires 120 for transmitting the first phase AC in the plurality of second winding slots 110c in each group of winding slots 110a decreases in the counterclockwise direction, and the number of flat wires 120 for transmitting the second phase AC in the plurality of second winding slots 110c increases in the counterclockwise direction, so that the windings for transmitting the first phase AC and the second phase AC are arranged in a regular manner, making the appearance of the motor stator more beautiful. It is also beneficial to form a continuous short-distance winding, 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 numbers of the flat wires 120 for transmitting the first phase AC power in the 12th slot, the 11th slot, and the 10th slot are 5, 3, and 1 respectively, and the numbers of the flat wires 120 for transmitting the first phase AC power in the plurality of second winding slots 110c decrease in the counterclockwise direction.

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

[0120] In the embodiment of the present application, the number of flat wires 120 for transmitting the first phase AC in the plurality of third winding slots 110d in each group of winding slots 110a increases in the counterclockwise direction, and correspondingly, the number of flat wires 120 for transmitting the third phase AC in the plurality of third winding slots 110d decreases in the counterclockwise direction, so that the windings for transmitting the first phase AC and the third phase AC are arranged in a regular manner, making the appearance of the motor stator more beautiful. It is also beneficial to form a continuous short-distance winding, 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 for transmitting the first phase AC power in the 16th slot, the 15th slot, and the 14th slot are 1, 3, and 5 respectively, and the number of flat wires 120 for transmitting the first phase AC power in the plurality of third winding slots 110d increases in the counterclockwise direction.

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

[0123] In one embodiment, the number of flat wires 120 for transmitting the first phase AC in the plurality of second winding slots 110c in each group of winding slots 110a is greater than the number of flat wires 120 for transmitting the second phase AC in a second winding slot 110c adjacent to a first winding slot 110b. The number of flat wires 120 for transmitting the first phase AC in the plurality of third winding slots 110d in each group of winding slots 110a is greater than the number of flat wires 120 for transmitting the third phase AC in a third winding slot 110d adjacent to a first winding slot 110b.

[0124] In an embodiment of the present application, the number of flat wires 120 used to transmit the first phase alternating current in the multiple second winding slots 110c in each group of winding slots 110a that decreases in a counterclockwise direction is greater than the number of flat wires 120 used to transmit the second phase alternating current in a second winding slot 110c adjacent to a first winding slot 110b, so that the flat wires 120 used to transmit the first phase alternating current and the second phase alternating current in the second winding slot 110c have more cross-wire modes when connected with the flat wires 120 in other groups of winding slots 110a, which is conducive to forming a continuous short-distance winding, 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, the number of flat wires 120 for transmitting the first phase AC power in the multiple second winding slots 110c in each group of winding slots 110a decreases by 2 in the counterclockwise direction, and the number of flat wires 120 for transmitting the second phase AC power in a second winding slot 110c adjacent to a first winding slot 110b is 1.

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

[0127] In an embodiment of the present application, the number of flat wires 120 for transmitting the first phase alternating current in the multiple third winding slots 110d in each group of winding slots 110a that increases in a counterclockwise direction is greater than the number of flat wires 120 for transmitting the third phase alternating current in a third winding slot 110d adjacent to a first winding slot 110b, so that the flat wires 120 for transmitting the first phase alternating current and the third phase alternating current in the third winding slot 110d have more cross-line modes when connected with the flat wires 120 in other groups of winding slots 110a, which is conducive to forming a continuous short-distance winding, 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, the number of flat wires 120 for transmitting the first phase AC in the third winding slots 110d in each group of winding slots 110a increases counterclockwise to 2, and the number of flat wires 120 for transmitting the third phase AC in a third winding slot 110d adjacent to a first winding slot 110b is 1.

[0129] like Figures 9 to 13b As shown, the number of flat wires 120 for transmitting the first phase AC in the third winding slots 110d in each group of winding slots 110a is 3 in the counterclockwise direction, and the number of flat wires 120 for transmitting the third phase AC 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 for transmitting the first phase alternating current in the plurality of second winding slots 110c in each group of winding slots 110a decreases by 2 in the counterclockwise direction, and the number of flat wires 120 for transmitting the first phase alternating current in the plurality of third winding slots 110d in each group of winding slots 110a increases by 2 in the counterclockwise direction. Alternatively, the number of flat wires 120 for transmitting the first phase alternating current in the plurality of second winding slots 110c in each group of winding slots 110a decreases by 3 in the counterclockwise direction. The number of flat wires 120 for transmitting the first phase alternating current in the plurality of third winding slots 110d in each group of winding slots 110a increases by 3 in the counterclockwise direction.

[0131] In the embodiments of the present application, Figures 5 to 8b As shown, the number of flat wires 120 for transmitting the first-phase alternating current in the multiple second winding slots 110c in each group of winding slots 110a decreases by 2 in the counterclockwise direction, and the number of flat wires 120 for transmitting the first-phase alternating current in the multiple third winding slots 110d in each group of winding slots 110a increases by 2 in the counterclockwise direction, so that the arrangement of the flat wires 120 of the three-phase alternating current in the winding slots 110 is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful.

[0132] In the embodiments of the present application, Figures 9 to 13b As shown, the number of flat wires 120 for transmitting the first-phase alternating current in the multiple second winding slots 110c of each group of winding slots 110a decreases by 3 in the counterclockwise direction, and the number of flat wires 120 for transmitting the first-phase alternating current in the multiple third winding slots 110d of each group of winding slots 110a increases by 3 in the counterclockwise direction, so that the arrangement of the flat wires 120 of the three-phase alternating current in the winding slots 110 is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful.

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

[0134] In the embodiment of the present application, the flat wire 120 for transmitting the first-phase alternating current in each second winding slot 110c is arranged adjacent to each other in sequence along the radial direction R of the flat wire motor 100, and the flat wire 120 for transmitting the second-phase alternating current in each second winding slot 110c is arranged adjacent to each other in sequence along the radial direction R of the flat wire motor, which is beneficial for arranging the flat wires 120 for transmitting the first-phase alternating current and the second-phase alternating current relatively concentratedly, and is beneficial for arranging the phase belt 140 in the flat wire motor 100.

[0135] In an embodiment of the present application, the distance between any flat wire 120 used to transmit the first-phase alternating current in each second winding slot 110c and the axis of the flat wire motor 100 is smaller than the distance between any flat wire 120 used to transmit the second-phase alternating current in each second winding slot 110c and the axis of the flat wire motor 100, that is, the flat wire 120 used to transmit the second-phase alternating current in each second winding slot 110c is arranged closer to the bottom of the winding slot 110 than the flat wire 120 used to transmit the first-phase alternating current.

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

[0137] In the embodiment of the present application, the flat wire 120 for transmitting the first phase alternating current in each third winding slot 110d is arranged adjacent to each other in sequence along the radial direction R of the flat wire motor, and the flat wire 120 for transmitting the third phase alternating current in each third winding slot 110d is arranged adjacent to each other in sequence along the radial direction R of the flat wire motor, which is beneficial for arranging the flat wires 120 for transmitting the first phase alternating current and the third phase alternating current relatively concentratedly, and is beneficial for arranging the phase belt 140 in the flat wire motor 100.

[0138] In an embodiment of the present application, the distance between any flat wire 120 used to transmit the first-phase alternating current 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 to transmit the third-phase alternating current in each third winding slot 110d and the axis of the flat wire motor 100, that is, the flat wire 120 used to transmit the third-phase alternating current in each third winding slot 110d is arranged closer to the slot opening of the winding slot 110 than the flat wire 120 used to transmit the first-phase alternating current.

[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, and the number of winding slots 110 between a second winding slot 110c and a first winding slot 110b is the same as the number of winding slots 110 between a third winding slot 110d and a first winding slot 110b, 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 to transmit the first phase alternating current in a second winding slot 110c is equal to the number of flat wires 120 used to transmit the first phase alternating current in a third winding slot 110d. The number of flat wires 120 used to transmit the second phase alternating current in a second winding slot 110c is equal to the number of flat wires 120 used to transmit the third phase alternating current in a third winding slot 110d.

[0140] In the embodiment of the present application, the number of flat wires 120 used to transmit the first phase AC in a second winding slot 110c is equal to the number of flat wires 120 used to transmit the first phase AC in a third winding slot 110d, and the number of flat wires 120 used to transmit the second phase AC in a second winding slot 110c is equal to the number of flat wires 120 used to transmit the third phase AC in a third winding slot 110d, so that the arrangement of the flat wires 120 used to transmit each phase AC is regular, so that the winding routing is regular, which is conducive to making the appearance of the motor stator more beautiful. It is also conducive to the automation of the motor stator winding, simplifying the production process, and improving production efficiency.

[0141] like Figures 5 to 8b As shown, the 12th slot is a second winding slot 110c, the 13th slot is a first winding slot 110b, the 14th slot is a third winding slot 110d, and the 12th slot and the 14th slot are adjacent to the 13th slot. The number of flat wires 120 used to transmit the first phase alternating current in the 12th slot is 5, and the number of flat wires 120 used to transmit the first phase alternating current in the 14th slot is also 5. The number of flat wires 120 used to transmit the second phase alternating current in the 12th slot is 1, and the number of flat wires 120 used to transmit the third phase alternating current in the 14th slot is also 1.

[0142] like Figures 5 to 8bAs shown, the 11th slot is a second winding slot 110c, the 13th slot is a first winding slot 110b, and the 15th slot is a third winding slot 110d. The number of winding slots 110 between the 11th slot and the 15th slot is the same as the number of slots between the 13th slot. The number of flat wires 120 used to transmit the first phase alternating current in the 11th slot is 3, and the number of flat wires 120 used to transmit the first phase alternating current in the 15th slot is also 3. The number of flat wires 120 used to transmit the second phase alternating current in the 11th slot is 3, and the number of flat wires 120 used to transmit the third phase alternating current in the 15th slot is also 3.

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

[0144] like Figures 9 to 13b As shown, the 11th slot is a second winding slot 110c, the 13th slot is a first winding slot 110b, and the 15th slot is a third winding slot 110d. The number of winding slots 110 between the 11th slot and the 15th slot is the same as the number of slots between the 13th slot. The number of flat wires 120 used to transmit the first phase alternating current in the 11th slot is 5, and the number of flat wires 120 used to transmit the first phase alternating current in the 15th slot is also 5. The number of flat wires 120 used to transmit the second phase alternating current in the 11th slot is 5, and the number of flat wires 120 used to transmit the third phase alternating current in the 15th slot is also 5.

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

[0146] In the embodiment of the present application, the flat wires 120 for transmitting the first phase AC and the second phase AC in the plurality of second winding slots 110c are arranged regularly, and the flat wires 120 for transmitting the first phase AC and the third phase AC in the plurality of third winding slots 110d are arranged regularly, so that the arrangement of the flat wires 120 for transmitting each phase AC is more regular, which is conducive to making the winding routing more regular and the appearance of the motor stator more beautiful. It is also conducive to the automation of the motor stator winding, simplifying the production process and improving production efficiency.

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

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

[0149] In one embodiment, all the flat wires 120 accommodated in the multiple groups of winding slots 110a are divided into multiple turns of flat wires 120 arranged along the radial direction R of the flat wire motor, each turn of flat wires 120 is divided into multiple groups of flat wires 1201 arranged along the circumferential direction C of the flat wire motor, and the four adjacent groups of flat wires 1201 are used to transmit one of the first phase alternating current, the second phase alternating current, and the third phase alternating current, and each group 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 group of flat wires 1201 in at least one turn of flat wires 120 and the number of flat wires 120 in each group of flat wires 1201 in the adjacent turn of flat wires 120 is different.

[0150] In the embodiment of the present application, the number of flat wires 120 in each group of flat wires 1201 in at least one circle of flat wires 120 and an adjacent circle of flat wires 120 is different, so that the winding can achieve a short-distance effect, which is beneficial to reducing the harmonic winding coefficient of the flat wire motor 100 and improving the NVH performance of the flat wire motor 100. It can also increase the diversity of the number of turns of the winding in series, which is beneficial to improving the motor performance.

[0151] like Figures 5 to 8b As shown, all the flat wires 120 accommodated by the multiple groups of winding slots 110a are divided into 4 circles of flat wires 120 arranged along the radial direction R of the flat wire motor, the first layer of flat wires 120 is the first circle of flat wires 120a, the second layer of flat wires 120 and the third layer of flat wires 120 constitute the second circle of flat wires 120b, the fourth layer of flat wires 120 and the fifth layer of flat wires 120 constitute the third circle of flat wires 120c, and the sixth layer of flat wires 120 constitute the fourth circle of flat wires 120d, the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a is 1, and the number of flat wires 120 in each group of flat wires 1201 in the second circle of flat wires 120b adjacent to the first circle of flat wires 120a is 2.

[0152] like Figures 9 to 13b As shown, all the flat wires 120 accommodated by the multiple groups of winding slots 110a are divided into 4 circles of flat wires 120 arranged along the radial direction R of the flat wire motor, the first layer of flat wires 120 and the second layer of flat wires 120 are the first circle 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 circle 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 circle of flat wires 120c, the ninth layer of flat wires 120 and the tenth layer of flat wires 120 constitute the fourth circle of flat wires 120d, the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a is 2, and the number of flat wires 120 in each group of flat wires 1201 in the second circle of flat wires 120b adjacent to the first circle of flat wires 120a is 3.

[0153] In one embodiment, four groups of adjacently arranged flat wires 1201 form a phase belt 140 , and two phase belts 140 in two adjacent turns of flat wire 120 are offset by one winding slot 110 .

[0154] In the embodiments of the present application, Figures 5 to 8b As shown, four groups of flat wires 1201 consisting of the first layer of flat wires 120 in the 25th, 26th, 27th and 28th slots in the first circle of flat wires 120a constitute a phase belt 140, and four groups of flat wires 1201 consisting of the second layer of flat wires 120 in the 24th, 25th, 26th and 27th slots and the third layer of flat wires 120 in the second circle of flat wires 120b constitute a phase belt 140, and the above two phase belts 140 are offset by one winding slot 110.

[0155] like Figures 9 to 13bAs shown, four groups of flat wires 1201 consisting of the first layer of flat wires 120 and the second layer of flat wires 120 in the 25th, 26th, 27th and 28th slots in the first circle of flat wires 120a constitute a phase belt 140, and four groups of flat wires 1201 consisting of the third layer of flat wires 120, the fourth layer of flat wires 120 and the fifth layer of flat wires 120 in the 24th, 25th, 26th and 27th slots in the second circle of flat wires 120b constitute a phase belt 140, and the above two phase belts 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 N-th 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 except the first turn of flat wire 120a and the axis of the flat wire motor 100, and the distance between any flat wire 120 in the N-th 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 except the N-th 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 N-th turn of flat wire 120n. The number of flat wires 120 in each group of flat wires 1201 in any circle of flat wires 120 between the first circle of flat wires 120 a and the Nth circle of flat wires 120 n is greater than the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120 a .

[0157] In the embodiment of the present application, the distance between any flat wire 120 in the first circle of flat wires 120a and the axis of the flat wire motor 100 is greater than the distance between any flat wire 120 in the multiple circles of flat wires 120 except the first circle of flat wires 120a and the axis of the flat wire motor 100, that is, the first circle of flat wires 120a refers to a circle of flat wires 120 located at the bottom of the slot in the winding slot 110. The distance between any flat wire 120 in the Nth circle of flat wires 120n and the axis of the flat wire motor 100 is less than the distance between any flat wire 120 in the multiple circles of flat wires 120 except the Nth circle of flat wires 120n and the axis of the flat wire motor 100, that is, the Nth circle of flat wires 120n refers to a circle of flat wires 120 located at the slot opening in the winding slot 110.

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

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

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

[0161] In an embodiment of the present application, the number of flat wires 120 in each group of flat wires 1201 in any circle of flat wires 120 between the first circle of flat wires 120a and the Nth circle of flat wires 120n is greater than the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a, thereby making the distribution of multiple circles of flat wires 120 in the winding slots 110 more diverse, and is also beneficial for the winding to achieve a continuous short-distance effect, thereby helping to weaken 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 circle of flat wires 120b is 2, the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a is 1, and the number of flat wires 120 in each group of flat wires 1201 in the second circle of flat wires 120b is greater than the number of flat wires 120 in each group of flat wires 1201 in the first circle 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 circle of flat wires 120b is 3, the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a is 2, and the number of flat wires 120 in each group of flat wires 1201 in the second circle of flat wires 120b is greater than the number of flat wires 120 in each group of flat wires 1201 in the first circle of flat wires 120a.

[0164] In one embodiment, if Figures 5 to 8b As shown, each group of winding slots 110a is composed of 7 adjacent winding slots 110 in sequence, the number of second winding slots 110c is 3, 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 alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 2, and the number of flat wires 120 used to transmit the first phase alternating current in a second winding slot 110c adjacent to a first winding slot 110b is 1.

[0165] In the embodiment of the present application, the difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 2, so that the arrangement of the flat wires 120 of the three-phase alternating current in the winding slots 110 is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 2, and the number of flat wires 120 used to transmit the first phase alternating current in a second winding slot 110c adjacent to a first winding slot 110b is 1, so that the winding can achieve a continuous short-distance 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, the 10th slot, the 11th slot, the 12th slot, the 13th slot, the 14th slot, the 15th slot, and the 16th slot form a group of winding slots 110a, the 13th slot is a first winding slot 110b, the 10th slot, the 11th slot, and the 12th slot are second winding slots 110c, and the 14th slot, the 15th slot, and the 16th slot are third winding slots 110d. The difference in the number of flat wires 120 used to transmit the first phase alternating current in the adjacent 10th slot and the 11th slot is 2, and the number of flat wires 120 used to transmit the first phase alternating current in the 12th slot adjacent to a first winding slot 110b is 1.

[0167] In one embodiment, if Figures 9 to 13b As shown, each group of winding slots 110a is composed of 7 adjacent winding slots 110 in sequence, the number of second winding slots 110c is 3, 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 alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 3, and the number of flat wires 120 used to transmit the first phase alternating current in a second winding slot 110c adjacent to a first winding slot 110b is 2.

[0168] In the embodiment of the present application, the difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 3, so that the arrangement of the flat wires 120 of the three-phase alternating current in the winding slots 110 is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The difference in the number of flat wires 120 used to transmit the first phase alternating current in two adjacent second winding slots 110c in each group of winding slots 110a is 3, and the number of flat wires 120 used to transmit the first phase alternating current in a second winding slot 110c adjacent to a first winding slot 110b is 2, so that the winding can achieve a continuous short distance 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, the 10th slot, the 11th slot, the 12th slot, the 13th slot, the 14th slot, the 15th slot, and the 16th slot form a group of winding slots 110a, the 13th slot is a first winding slot 110b, the 10th slot, the 11th slot, and the 12th slot are second winding slots 110c, and the 14th slot, the 15th slot, and the 16th slot are third winding slots 110d. The difference in the number of flat wires 120 used to transmit the first phase alternating current in the adjacent 10th slot and the 11th slot is 3, and the number of flat wires 120 used to transmit the first phase alternating current in the 12th slot adjacent to a first winding slot 110b is 2.

[0170] In one embodiment, if Figures 5 to 13b As shown, each group of winding slots 110a is composed of 7 adjacent winding slots 110 in sequence, the number of second winding slots 110c is 3, each winding slot 110 is used to accommodate L flat wires 120, the number of flat wires 120 used to transmit the first phase alternating current in each second winding slot 110c is not equal to an integer multiple of L / 4, and the number of flat wires 120 used to transmit the third phase alternating current in each third winding slot 110d is not equal to an integer multiple of L / 4.

[0171] In the embodiment of the present application, the number of flat wires 120 used to transmit the first phase AC in each second winding slot 110c is not equal to an integer multiple of L / 4, so that the arrangement of the flat wires 120 of the three-phase AC in the winding slot 110 is more regular, the winding routing is more regular, and the appearance of the motor stator is more beautiful. The number of flat wires 120 used to transmit the third phase AC in each third winding slot 110d is not equal to an integer multiple of L / 4, so that the winding can achieve a continuous short-distance 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, p is a positive integer, 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, a short-distance winding structure of L layers of flat wires 120 is applicable, wherein 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, that is, L=T1+T2+T3+T4, and the four positive integers T1, T2, T3, and T4 are not all equal. The T1 layer flat wires 120 are divided into one group, the T2 layer flat wires 120 are divided into one group, the T3 layer flat wires 120 are divided into one group, and the T4 layer flat wires 120 are divided into another group. The T2 layer flat wires 120 are offset by one winding slot 110 relative to the T1 layer flat wires 120 in a clockwise direction along the circumference, the T3 layer flat wires 120 are offset by another winding slot 110 relative to the T2 layer flat wires 120 in the same circumferential direction, and the T4 layer flat wires 120 are offset by another winding slot 110 relative to the T3 layer flat wires 120 in the same circumferential direction, so that the winding achieves a continuous short distance effect.

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

[0176] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Y-type manner.

[0177] In one embodiment, the lead wires of each phase winding of the stator winding are connected in a Δ-type manner.

[0178] In the embodiment of the present application, the winding arrangement is applicable to both even layers with L / 2=odd number and even layers with L / 2=even number, which broadens the flexibility of winding design. Multiple flat wire groups are staggered by 1 winding slot, which is equivalent to a continuous short distance, and can simultaneously weaken the 6k±1 (k=1 or 2) harmonics of the winding, thereby improving the NVH performance. The flat wires in each parallel sub-winding of each phase are evenly distributed at different layers in each pole slot, and the back electromotive force and current of each parallel sub-winding are exactly the same, which eliminates the additional copper loss of the winding circulation caused by the parallel connection of the windings, ensures the uniformity of the winding temperature, and thus improves the life of the motor. The three-phase lead wires are located on the 1st layer or the Lth layer, or the three-phase lead wires are located on the same layer at the bottom of the slot, and the branch lead wires are located on adjacent layers, which can make full use of the radial space and simplify the Busbar structure. The hairpin coils on each layer are independent of each other, and there are no additional cross-layer hairpin coils. Fully automatic wire insertion can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0179] Fig.14 is a schematic diagram of the connection of the three-phase winding ends provided in an embodiment of the present application, Fig.15 This is another connection diagram of the three-phase winding ends provided in an embodiment of the present application.

[0180] In one embodiment, a three-phase flat wire motor has a stator winding divided into a U phase, a V phase, and a W phase, and the number of parallel branches set for each phase winding is 2. Fig.14As shown, the three-phase windings of the stator winding are respectively composed of two parallel circuits, the two parallel branches of the U-phase winding are marked as U1 and U2, the two parallel branches of the V-phase winding are marked as V1 and V2, and the two parallel branches of the W-phase winding are marked as W1 and W2. The ends of the U-phase, V-phase and W-phase are connected in a Y-type manner. In another embodiment, as Fig.15 As shown, the three-phase windings of the stator winding are respectively 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 following will describe in detail the connection method of the specific parallel branches in the embodiment of the present application in combination with specific embodiments.

[0182] exist Figures 5 to 13b The winding structure is described as follows: Figures 5 to 13b The first row is the slot number of the winding slot, the first column is the layer number of the flat wire in each winding slot, and the 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 slot mouth of the winding slot. "-" represents the current flowing into the flat wire, "+" represents the current flowing out of the flat wire, U1 represents the first parallel branch, U 1in Represents the first lead-out line of the first parallel branch, U 1out U represents the tail lead of the first parallel branch. U2 represents the second parallel branch. 2in Represents the first lead of the second parallel branch, U 2out Represents the tail lead of the second parallel branch, U 3in Represents the lead-out line of the third parallel branch, U 3out Represents the tail lead of the third parallel branch. It should be noted that Figures 5 to 13b Phase band distribution in an embodiment of the present application. Figures 5 to 13b The "+" and "-" symbols in Figures 5 to 13b The "U+" in the figure is changed to "U-", and the "U-" is changed to "U+", and the V phase and W phase are also modified accordingly, all of which are within the protection scope of this application.

[0183] In one embodiment, the number of winding slots of the stator core is Z=72, the number of stator winding poles and the number of rotor poles are 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 for each phase winding is 2. Figure 5 Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

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

[0185] Figure 5 to Figure 5b Each parallel branch traverses the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The 6 layers of flat wires are divided into 4 groups, T1, T2, T3, and T4 are 1, 2, 2, and 1 respectively, that is, T1 contains the 1st layer of flat wires, T2 contains the 2nd / 3rd layer of flat wires, T3 contains the 4th / 5th layer of flat wires, and T4 contains the 6th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by one winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor. The flat wires of the T4 layer are staggered by one winding slot relative to the flat wires of the T3 layer in the same direction of the flat wire motor, so that the winding can achieve a continuous short distance effect. The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0186] For example, the lead-out line at the head end of 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 lead-out line at the tail end is led out from the second layer of the 1st slot. In this process, three types of hairpin coils with spans of 8, 11, and 12 are used.

[0187] The lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 14th slot. After connecting all the flat wires belonging to the first branch at the 3 / 4th layer, the lead-out line at the tail end is led out from the 4th layer of the 1st slot. Three types of hairpin coils with spans of 8, 11, and 12 are used.

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

[0189] Based on the three sub-branches of the first branch, it can be seen that there are a total of 12 types of card issuing coils.

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

[0191] A single cross-layer cross-line segment is used to achieve cross-layer connection, connecting the first, second, and third sub-branch coils. The spans of the cross-layer cross-line segments between layers can be equal or not. Figure 5In the first embodiment shown, the cross-layer and cross-line segment spans from the 2nd layer to the 3rd layer and from the 4th layer to the 5th layer are 13. Except for the cross-layer and cross-line segments, the welding end spans of each sub-branch are the same, which are 13 in the first embodiment of the present application, so that the twisting angles of the welding sections are the same, which simplifies the twisting, welding and coating processes.

[0192] like Figure 5 to Figure 5b As shown, the T1-layer flat wire, the T2-layer flat wire, the T3-layer flat wire and the T4-layer flat wire respectively include different phase belts, each phase belt includes four adjacently arranged winding slots, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire, and the phase belt of the T4-layer flat wire is offset by one winding slot relative to the phase belt of the T3-layer flat wire. For example, in a T1 layer flat wire, the 1st layer flat wire in the 25th, 26th, 27th and 28th slots is a phase band, in a T2 layer flat wire, the 2nd / 3rd layer flat wire in the 24th, 25th, 26th and 27th slots is a phase band, in a T3 layer flat wire, the 4th / 5th layer flat wire in the 23rd, 24th, 25th and 26th slots is a phase band, and in a T4 layer flat wire, the 6th layer flat wire in the 22nd, 23rd, 24th and 25th slots is a phase band.

[0193] like Figure 5 to Figure 5b As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil. Figure 5 to Figure 5b It can be seen that the lead wires of each phase are all on the 1st or 6th layer, which makes the busbar structure design simpler.

[0194] Combine the following Figure 5 to Figure 5b The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figure 5 to Figure 5b The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0195] The first branch of the first branch of the U phase starts at the first layer of the 14th slot as the incoming line terminal U 1in, enter from the 1st floor of the 14th slot, exit from the 2nd floor of the 26th slot, then enter from the 1st floor of the 39th slot, exit from the 2nd floor of the 50th slot, then enter from the 1st floor of the 63rd slot, exit from the 2nd floor of the 2nd slot, then enter from the 1st floor of the 15th slot, exit from the 2nd floor of the 27th slot, then enter from the 1st floor of the 40th slot, exit from the 2nd floor of the 51st slot, then enter from the 1st floor of the 64th slot, exit from the 2nd floor of the 3rd slot, then enter from the 16th slot Enter from the 1st layer, exit from the 2nd layer of the 24th slot, then enter from the 1st layer of the 37th slot, exit from the 2nd layer of the 48th slot, then enter from the 1st layer of the 61st slot, exit from the 2nd layer of the 72nd slot, then enter from the 1st layer of the 13th slot, exit from the 2nd layer of the 25th slot, then enter from the 1st layer of the 38th slot, exit from the 2nd layer of the 49th slot, then enter from the 1st layer of the 62nd slot, exit from the 2nd layer of the 1st slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0196] The lead-out line of the second sub-branch of the first branch of the U phase starts from the third layer of slot 14, enters from the third layer of slot 14, exits from the fourth layer of slot 26, then enters from the third layer of slot 39, exits from the fourth layer of slot 50, then enters from the third layer of slot 63, exits from the fourth layer of slot 2, then enters from the third layer of slot 15, exits from the fourth layer of slot 23, then enters from the third layer of slot 36, exits from the fourth layer of slot 47, then enters from the third layer of slot 60, exits from the fourth layer of slot 71. Exit from the 4th layer, then enter from the 3rd layer of the 12th slot, exit from the 4th layer of the 24th slot, then enter from the 3rd layer of the 37th slot, exit from the 4th layer of the 48th slot, then enter from the 3rd layer of the 61st slot, exit from the 4th layer of the 72nd slot, then enter from the 3rd layer of the 13th slot, exit from the 4th layer of the 25th slot, then enter from the 3rd layer of the 38th slot, exit from the 4th layer of the 49th slot, then enter from the 3rd layer of the 62th slot, and exit from the 4th layer of the 1st slot, thus completing the traversal of the 3rd and 4th layers of the flat wire.

[0197] The lead-out line of the third sub-branch of the first branch of the U phase starts from the 5th layer of slot 14, enters from the 5th layer of slot 14, exits from the 6th layer of slot 22, then enters from the 5th layer of slot 35, exits from the 6th layer of slot 46, then enters from the 5th layer of slot 59, exits from the 6th layer of slot 70, then enters from the 5th layer of slot 11, exits from the 6th layer of slot 23, then enters from the 5th layer of slot 36, exits from the 6th layer of slot 47, then enters from the 5th layer of slot 60, exits from the 6th layer of slot 71, then enters from the 5th layer of slot 12, exits from the 6th layer of slot 13. The 5th layer enters, and exits from the 6th layer of the 24th slot, then enters from the 5th layer of the 37th slot, exits from the 6th layer of the 48th slot, then enters from the 5th layer of the 61st slot, exits from the 6th layer of the 72nd slot, then enters from the 5th layer of the 13th slot, exits from the 6th layer of the 25th slot, then enters from the 5th layer of the 38th slot, exits from the 6th layer of the 49th slot, then enters from the 5th layer of the 62nd slot, and exits from the 6th layer of the 1st slot, thus completing the traversal of the 5th and 6th layers of flat wires, and thus leading out from the 6th layer of the 1st slot to form the outlet 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 1st layer of the 14th slot" means connecting the flat wire of the 1st layer of the 14th slot at the welding end, and "leading out from the 6th layer of the 1st slot" means connecting the flat wire of the 6th layer of the 1st slot at the welding end.

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

[0200] The lead-out line of the second sub-branch of the second branch of the U phase starts from the 4th layer of slot 12, enters from the 4th layer of slot 12, exits from the 3rd layer of slot 1, then enters from the 4th layer of slot 60, exits from the 3rd layer of slot 48, then enters from the 4th layer of slot 35, exits from the 3rd layer of slot 24, then enters from the 4th layer of slot 11, exits from the 3rd layer of slot 72, then enters from the 4th layer of slot 59, exits from the 3rd layer of slot 51, then enters from the 4th layer of slot 38, and exits from slot 27. , then enter from the 4th layer of the 14th slot, exit from the 3rd layer of the 3rd slot, then enter from the 4th layer of the 62nd slot, exit from the 3rd layer of the 50th slot, then enter from the 4th layer of the 37th slot, exit from the 3rd layer of the 26th slot, then enter from the 4th layer of the 13th slot, exit from the 3rd layer of the 2nd slot, then enter from the 4th layer of the 61st slot, exit from the 3rd layer of the 49th slot, then enter from the 4th layer of the 36th slot, and exit from the 3rd layer of the 25th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0201] The lead-out line of the third sub-branch of the second branch of the U phase starts from the second layer of slot 12, enters from the second layer of slot 12, exits from the first layer of slot 1, then enters from the second layer of slot 60, exits from the first layer of slot 52, then enters from the second layer of slot 39, exits from the first layer of slot 28, then enters from the second layer of slot 15, exits from the first layer of slot 4, then enters from the second layer of slot 63, exits from the first layer of slot 51, then enters from the second layer of slot 38, and exits from the first layer of slot 27. The flat wire exits from the first layer, then enters from the second layer of the 14th slot, exits from the first layer of the 3rd slot, then enters from the second layer of the 62nd slot, exits from the first layer of the 50th slot, then enters from the second layer of the 37th slot, exits from the first layer of the 26th slot, then enters from the second layer of the 13th slot, exits from the first layer of the 2nd slot, then enters from the second layer of the 61st slot, exits from the first layer of the 49th slot, then enters from the second layer of the 36th slot, exits from the first layer of the 25th slot, and thus completes the traversal of the first and second layers of the flat wire. At this point, it is led out from the first layer of the 25th slot to form the outlet 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 the V phase and the first branch of the W phase is Figure 5 to Figure 5b The connection method of the second branch of the V phase and the second branch of the W phase is Figure 5 to Figure 5b It can be obtained by translating based on the second branch of the U phase.

[0204] Table 1. Example 1, comparison table of harmonic winding coefficients of conventional full-pitch winding and traditional short-pitch winding

[0205]

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

[0207] As shown in Table 1, this application Figure 5 to Figure 5b In the embodiment 1 shown, the 7th, 11th, 13th, and 17th harmonic winding coefficients of the continuous short-pitch winding are 0.0154, 0.0051, 0.0051, and 0.0154, and the pitch is 10. The 7th, 11th, 13th, and 17th harmonic winding coefficients of the traditional short-pitch winding are 0.0408, 0.1218, 0.1218, and 0.0408. Figure 5 to Figure 5b The 7th, 11th, 13th, and 17th harmonic winding coefficients of the continuous short-pitch winding in the first embodiment are much lower than those of the conventional short-pitch winding with a pitch of 10. Figure 5 to Figure 5b The 5th and 19th harmonic winding coefficients of the continuous short-pitch winding in the first embodiment shown are 0.0824, which are slightly higher than the 0.0531 of the conventional short-pitch winding with a pitch of 10. Figure 5 to Figure 5b The fundamental wave winding coefficient in the first embodiment shown is 0.9279, which is higher than 0.9250 of the traditional short pitch winding with a pitch of 10, reducing the impact of the short pitch on the average torque and having the advantage of weakening high-order harmonics without weakening the fundamental wave.

[0208] Fig.16 This is a torque pulsation comparison diagram of the peak operating point of the winding in the first embodiment of the present application. The horizontal axis represents the electrical angle, and the vertical axis represents the torque.

[0209] like Fig.16As shown, curve A represents the torque waveform of the continuous short-pitch winding in Example 1, curve B represents the torque waveform of the traditional short-pitch winding, and curve C represents the torque waveform of the full-pitch winding. The peak-to-peak torque value of the full-pitch winding can reach 430Nm, and the trough value can be close to 413Nm, and the torque pulsation is relatively large. The torque pulsation of the operating point of the continuous short-pitch winding and the traditional short-pitch winding in Example 1 of the present application is between 413Nm and 424Nm. The torque pulsation of the peak torque operating point of Example 1 of the present application is smaller than that of the traditional full-pitch winding and the traditional short-pitch winding.

[0210] In one embodiment, the number of winding slots of the stator core is Z=72, the number of stator winding poles and the number of rotor poles are 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 for each phase winding is 3. Figures 6 to 8b Schematic diagram of the connection of three parallel branches of the U phase in this embodiment.

[0211] like Figure 3 , Figures 6 to 8b As shown, each winding slot contains L=6 layers of flat wires, the first layer is L1, the second layer is L2, the third layer is L3, the fourth layer is L4, the fifth layer is L5, and the sixth layer is 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 the positions of the flat wire layers that can be arranged, so the number of parallel branches can maintain potential balance and no circulating current will be generated. The 6 layers of flat wires are divided into 4 groups, T1, T2, T3, and T4 are 1, 2, 2, and 1 respectively, that is, T1 contains the 1st layer of flat wires, T2 contains the 2nd / 3rd layer of flat wires, T3 contains the 4th / 5th layer of flat wires, and T4 contains the 6th layer of flat wires. The flat wires of the T2 layer are staggered by 1 winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by 1 winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor. The flat wires of the T4 layer are staggered by 1 winding slot relative to the flat wires of the T3 layer in the same direction of the flat wire motor, so that the winding can achieve a continuous short distance effect. The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0213] The connection relationship of the windings is illustrated by the first parallel branch of the U phase: the lead-out wire at the head end is led out from the second layer of the 12th slot, and moves along the positive direction of the X-axis and the direction of increasing layers to reach the sixth layer of the 58th slot; the same layer is switched to the 70th slot, and then moves along the negative direction of the X-axis and the direction of decreasing layers to reach the first layer of the 13th slot; the same layer is switched to the 4th slot, and continues to move along the positive direction of the X-axis and the direction of increasing layers to reach the sixth layer of the 61st slot; the same layer is switched to the 1st slot, and moves along the negative direction of the X-axis and the direction of decreasing layers to reach the first layer of the 16th slot. The same layer switches to the 26th slot, and moves along the positive direction of the X axis and the direction of increasing layers to reach the 6th layer of the 11th slot; the same layer switches to the 23rd slot, and moves along the negative direction of the X axis and the direction of decreasing layers to reach the 1st layer of the 38th slot; the same layer switches to the 51st slot, and continues to move along the positive direction of the X axis and the direction of increasing layers to reach the 6th layer of the 36th slot; the same layer switches to the 48th slot, and moves along the negative direction of the X axis and the direction of decreasing layers to reach the 1st layer of the 63rd slot. The same layer switches to the 1st slot and ends, and the tail lead wire is led out from the 1st slot.

[0214] The hairpin coils are respectively connected across the 2nd / 3rd layers and the 4th / 5th layers. The 6th layer is the same-layer hairpin coil and contains only one span Z / 2p=12. The 1st layer contains 3 spans, which are Z / 2p+1=13, (Z / 2p)-q+1=9, and (Z / 2p)-q+2=10. There are a total of (L / 2)+3=6 types of hairpin coil line types.

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

[0216] like Figures 6 to 8bAs shown, the T1-layer flat wire, the T2-layer flat wire, the T3-layer flat wire and the T4-layer flat wire respectively include different phase belts, each phase belt includes four adjacently arranged winding slots, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire, and the phase belt of the T4-layer flat wire is offset by one winding slot relative to the phase belt of the T3-layer flat wire. For example, in a T1 layer flat wire, the 1st layer flat wire in the 25th, 26th, 27th and 28th slots is a phase band, in a T2 layer flat wire, the 2nd / 3rd layer flat wire in the 24th, 25th, 26th and 27th slots is a phase band, in a T3 layer flat wire, the 4th / 5th layer flat wire in the 23rd, 24th, 25th and 26th slots is a phase band, and in a T4 layer flat wire, the 6th layer flat wire in the 22nd, 23rd, 24th and 25th slots is a phase band.

[0217] like Figures 6 to 8b As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0218] Combine the following Figures 6 to 8b The wiring method of the U-phase three-parallel branch in the embodiment of the present application is described in detail. Figures 6 to 8b The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0219] like Figure 6 to Figure 6b As shown, the first branch of the U-phase winding uses the second layer of the 12th slot as the incoming line terminal U 1in , enter from the 2nd floor of the 12th slot, exit from the 3rd floor of the 24th slot, then enter from the 4th floor of the 35th slot, exit from the 5th floor of the 47th slot, then enter from the 6th floor of the 58th slot, exit from the 6th floor of the 70th slot, then enter from the 5th floor of the 59th slot, exit from the 4th floor of the 47th slot, then enter from the 3rd floor of the 36th slot, exit from the 24th slot, then enter from the 1st floor of the 13th slot, and exit from the 1st floor of the 4th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 6th floor.

[0220] Then enter from the 2nd floor of the 15th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 38th slot, exit from the 5th floor of the 50th slot, then enter from the 6th floor of the 61st slot, exit from the 6th floor of the 1st slot, then enter from the 5th floor of the 62nd slot, exit from the 4th floor of the 50th slot, then enter from the 3rd floor of the 39th slot, exit from the 27th slot, then enter from the 1st floor of the 16th slot, exit from the 1st floor of the 26th slot. At this point, the second traversal is completed.

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

[0222] Then it enters from the 2nd layer of the 62nd slot, exits from the 3rd layer of the 2nd slot, then enters from the 4th layer of the 13th slot, exits from the 5th layer of the 25th slot, then enters from the 6th layer of the 36th slot, exits from the 6th layer of the 48th slot, then enters from the 5th layer of the 37th slot, exits from the 4th layer of the 25th slot, then enters from the 3rd layer of the 14th slot, exits from the 2nd layer of the 2nd slot, then enters from the 1st layer of the 63rd slot, exits from the 1st layer of the 1st slot, and is now led out from the 1st layer of the 1st slot to form the outlet 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 2nd layer of the 12th groove" means connecting the flat wire of the 2nd layer of the 12th groove at the welding end, and "leading out from the 1st layer of the 1st groove" means connecting the flat wire of the 1st layer of the 1st groove at the welding end.

[0224] like Figure 7 to Figure 7b As shown, the second branch of the U-phase winding uses the second layer of the 60th slot as the incoming line terminal U 2in , enter from the 2nd floor of the 60th slot, exit from the 3rd floor of the 72nd slot, then enter from the 4th floor of the 11th slot, exit from the 5th floor of the 23rd slot, then enter from the 6th floor of the 34th slot, exit from the 6th floor of the 46th slot, then enter from the 5th floor of the 35th slot, exit from the 4th floor of the 23rd slot, then enter from the 3rd floor of the 12th slot, exit from the 2nd floor of the 72nd slot, then enter from the 1st floor of the 61st slot, and exit from the 1st floor of the 52nd slot. At this point, the flat wire can be connected to complete the first traversal from the 1st floor to the 6th floor.

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

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

[0227] Then it enters from the second layer of the 38th slot, exits from the third layer of the 50th slot, then enters from the fourth layer of the 61st slot, exits from the fifth layer of the first slot, then enters from the sixth layer of the 12th slot, exits from the sixth layer of the 26th slot, then enters from the fifth layer of the 13th slot, exits from the fourth layer of the first slot, then enters from the third layer of the 62nd slot, exits from the second layer of the 50th slot, then enters from the first layer of the 39th slot, exits from the first layer of the 49th slot, and is led out from the first layer of the 49th slot to form the outlet 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 2nd layer of the 60th slot" means connecting the flat wire of the 2nd layer of the 60th slot at the welding end, and "leading out from the 1st layer of the 49th slot" means connecting the flat wire of the 1st layer of the 49th slot at the welding end.

[0229] like Figure 8 to Figure 8b As shown, the third branch of the U-phase winding uses the second layer of the 36th slot as the incoming line terminal U 3in , enter from the 2nd floor of the 36th slot, exit from the 3rd floor of the 48th slot, then enter from the 4th floor of the 59th slot, exit from the 5th floor of the 71st slot, then enter from the 6th floor of the 10th slot, exit from the 6th floor of the 22nd slot, then enter from the 5th floor of the 11th slot, exit from the 4th floor of the 71st slot, then enter from the 3rd floor of the 60th slot, exit from the 2nd floor of the 48th slot, then enter from the 1st floor of the 37th slot, and exit from the 1st floor of the 28th slot. At this point, the flat wire is connected to complete the first traversal from the 1st floor to the 6th floor.

[0230] Then enter from the 2nd floor of the 39th slot, exit from the 3rd floor of the 51st slot, then enter from the 4th floor of the 62nd slot, exit from the 5th floor of the 2nd slot, then enter from the 6th floor of the 13th slot, exit from the 6th floor of the 25th slot, then enter from the 5th floor of the 14th slot, exit from the 4th floor of the 2nd slot, then enter from the 3rd floor of the 63rd slot, exit from the 2nd floor of the 51st slot, then enter from the 1st floor of the 40th slot, exit from the 1st floor of the 50th slot. At this point, the second traversal is completed.

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

[0232] Then it enters from the 2nd layer of the 14th slot, exits from the 3rd layer of the 26th slot, then enters from the 4th layer of the 37th slot, exits from the 5th layer of the 49th slot, then enters from the 6th layer of the 60th slot, exits from the 6th layer of the 72nd slot, then enters from the 5th layer of the 61st slot, exits from the 4th layer of the 49th slot, then enters from the 3rd layer of the 38th slot, exits from the 2nd layer of the 26th slot, then enters from the 1st layer of the 15th slot, exits from the 1st layer of the 25th slot, and is led out from the 1st layer of the 25th slot to form the outlet 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 2nd layer of the 36th slot" means connecting the flat wire of the 2nd layer of the 36th 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.

[0234] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 6 to Figure 6b The connection method of the second branch of the V phase and the second branch of the W phase is Figure 7 to Figure 7b The wiring method of the third branch of the V phase and the third branch of the W phase can be obtained by translating the second branch of the U phase in Figure 8 to Figure 8b It can be obtained by translating based on the third branch of the U phase.

[0235] In one embodiment, the number of winding slots of the stator core is Z=72, the number of stator winding poles and the number of 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 for each phase winding is 2. Figures 9 to 10b Schematic diagram of the connection of two parallel branches of the U phase in this embodiment.

[0236] like Figure 3 , Figures 9 to 10bAs shown, each winding slot contains L=10 layers of flat wires, the first layer is L1, the second layer is L2, the third layer is L3, the fourth layer is L4, the fifth layer is L5, the sixth layer is L6, the seventh layer is L7, the eighth layer is L8, the ninth layer is L9, and the tenth layer is 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 the positions of the flat wire layers that can be arranged, so the number of each parallel branch can maintain potential balance and no circulating current will be generated. The 10 layers of flat wires are divided into 4 groups, and T1, T2, T3, and T4 are 2, 3, 3, and 2 respectively, that is, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th layer of flat wires, T3 contains the 6th / 7th / 8th layer of flat wires, and T4 contains the 9th / 10th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by one winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor. The flat wires of the T4 layer are staggered by one winding slot relative to the flat wires of the T3 layer in the same direction of the flat wire motor, so that the winding can achieve a continuous short distance effect. The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0238] For example, the lead-out line at the head end of 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 lead-out line at the tail end is led 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 lead-out line at the head end of the second sub-branch of the U phase starts from the 3rd layer of the 13th slot. After connecting all the flat wires belonging to the first branch at the 3rd / 4th layers, the lead-out line at the tail end is led out from the 4th layer of the 1st slot. Three types of hairpin coils with spans of 9, 12, and 13 are used.

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

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

[0242] The lead-out line at the head end of the fifth sub-branch of the U phase starts from the 9th layer of the 13th slot. After connecting all the flat wires belonging to the first branch at the 9th / 10th layer, the lead-out line at the tail end is led out from the 10th layer of the 1st slot. There are three spans 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 card issuing coils.

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

[0245] A single cross-layer cross-line segment is used to achieve cross-layer connection from layer 2 to layer 3, layer 4 to layer 5, layer 6 to layer 7, and layer 8 to layer 9, connecting five sub-branches. The lead-out wires of the two branches are both on the 1st and 10th layers, simplifying the structural design of the busbar.

[0246] like Figures 9 to 10b As shown, the T1-layer flat wire, the T2-layer flat wire, the T3-layer flat wire and the T4-layer flat wire respectively include different phase belts, each phase belt includes four adjacently arranged winding slots, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire, and the phase belt of the T4-layer flat wire is offset by one winding slot relative to the phase belt of the T3-layer flat wire. For example, in a T1 layer flat wire, the 1st / 2nd layer flat wires in the 25th, 26th, 27th and 28th slots are a phase band, in a T2 layer flat wire, the 3rd / 4th / 5th layer flat wires in the 24th, 25th, 26th and 27th slots are a phase band, in a T3 layer flat wire, the 6th / 7th / 8th layer flat wires in the 23rd, 24th, 25th and 26th slots are a phase band, and in a T4 layer flat wire, the 9th / 10th layer flat wires in the 22nd, 23rd, 24th and 25th slots are a phase band.

[0247] like Figures 9 to 10b As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0248] Combine the following Figures 9 to 10b The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figures 9 to 10b The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0249] like Figure 9 to Figure 9b As shown, the first branch of the first branch of the U phase starts at the first layer of the 13th slot as the incoming line terminal U 1in, enter from the 1st floor of the 13th slot, exit from the 2nd floor of the 26th slot, then enter from the 1st floor of the 38th slot, exit from the 2nd floor of the 50th slot, then enter from the 1st floor of the 62nd slot, exit from the 2nd floor of the 2nd slot, then enter from the 1st floor of the 14th slot, exit from the 2nd floor of the 27th slot, then enter from the 1st floor of the 39th slot, exit from the 2nd floor of the 51st slot, then enter from the 1st floor of the 63rd slot, exit from the 2nd floor of the 3rd slot, then enter from the 15th slot Enter the 1st layer and exit from the 2nd layer of the 28th slot, then enter from the 1st layer of the 40th slot and exit from the 2nd layer of the 52nd slot, then enter from the 1st layer of the 64th slot and exit from the 2nd layer of the 4th slot, then enter from the 1st layer of the 16th slot and exit from the 2nd layer of the 25th slot, then enter from the 1st layer of the 37th slot and exit from the 2nd layer of the 49th slot, then enter from the 1st layer of the 61st slot and exit from the 2nd layer of the 1st slot, thus completing the traversal of the 1st and 2nd layer flat wires.

[0250] The lead-out line of the second sub-branch of the first branch of the U phase starts from the third layer of the 13th slot, enters from the third layer of the 13th slot, exits from the fourth layer of the 26th slot, then enters from the third layer of the 38th slot, exits from the fourth layer of the 50th slot, then enters from the third layer of the 62nd slot, exits from the fourth layer of the 2nd slot, then enters from the third layer of the 14th slot, exits from the fourth layer of the 27th slot, then enters from the third layer of the 39th slot, exits from the fourth layer of the 51st slot, then enters from the third layer of the 63rd slot, exits from the fourth layer of the 3rd slot Then enter from the 3rd layer of the 15th slot, exit from the 4th layer of the 24th slot, then enter from the 3rd layer of the 36th slot, exit from the 4th layer of the 48th slot, then enter from the 3rd layer of the 60th slot, exit from the 4th layer of the 72nd slot, then enter from the 3rd layer of the 12th slot, exit from the 4th layer of the 25th slot, then enter from the 3rd layer of the 37th slot, exit from the 49th slot, then enter from the 3rd layer of the 61st slot, and exit from the 4th layer of the 1st slot, thus completing the traversal of the 3rd and 4th layers of the flat wire.

[0251] The lead-out line of the third sub-branch of the first branch of the U phase starts from the 5th layer of the 13th slot, enters from the 5th layer of the 13th slot, exits from the 6th layer of the 24th slot, then enters from the 5th layer of the 38th slot, exits from the 6th layer of the 49th slot, then enters from the 5th layer of the 62nd slot, exits from the 6th layer of the 1st slot, then enters from the 5th layer of the 14th slot, exits from the 6th layer of the 26th slot, then enters from the 5th layer of the 39th slot, exits from the 6th layer of the 50th slot, then enters from the 5th layer of the 63rd slot, and exits from the 6th layer of the 2nd slot. 6th layer, then enter from the 5th layer of the 15th slot, exit from the 6th layer of the 23rd slot, then enter from the 5th layer of the 36th slot, exit from the 6th layer of the 47th slot, then enter from the 5th layer of the 60th slot, exit from the 6th layer of the 71st slot, then enter from the 5th layer of the 12th slot, exit from the 6th layer of the 24th slot, then enter from the 5th layer of the 37th slot, exit from the 6th layer of the 48th slot, then enter from the 5th layer of the 61st slot, and exit from the 6th layer of the 72nd slot, thus completing the traversal of the 5th and 6th layer flat wires.

[0252] The lead-out line of the fourth sub-branch of the first branch of the U phase starts from the 7th layer of the 13th slot, enters from the 7th layer of the 13th slot, exits from the 8th layer of the 26th slot, then enters from the 7th layer of the 38th slot, exits from the 8th layer of the 50th slot, then enters from the 7th layer of the 62nd slot, exits from the 8th layer of the 2nd slot, then enters from the 7th layer of the 14th slot, exits from the 8th layer of the 23rd slot, then enters from the 7th layer of the 35th slot, exits from the 8th layer of the 47th slot, then enters from the 7th layer of the 59th slot, and exits from the 71st slot. Exit from the 8th layer, then enter from the 7th layer of the 11th slot, exit from the 8th layer of the 24th slot, then enter from the 7th layer of the 36th slot, exit from the 8th layer of the 48th slot, then enter from the 7th layer of the 60th slot, exit from the 8th layer of the 72nd slot, then enter from the 7th layer of the 12th slot, exit from the 8th layer of the 25th slot, then enter from the 7th layer of the 37th slot, exit from the 8th layer of the 49th slot, then enter from the 7th layer of the 61st slot, and exit from the 8th layer of the 1st slot, thus completing the traversal of the 7th and 8th layers of flat wires.

[0253] The lead-out line of the fifth sub-branch of the first branch of the U phase starts from the 9th layer of the 13th slot, enters from the 9th layer of the 13th slot, exits from the 10th layer of the 22nd slot, then enters from the 9th layer of the 34th slot, exits from the 10th layer of the 46th slot, then enters from the 9th layer of the 58th slot, exits from the 10th layer of the 70th slot, then enters from the 9th layer of the 10th slot, exits from the 10th layer of the 23rd slot, then enters from the 9th layer of the 35th slot, exits from the 10th layer of the 47th slot, then enters from the 9th layer of the 59th slot, exits from the 10th layer of the 71st slot, and then Then it enters from the 9th layer of the 11th slot, exits from the 10th layer of the 24th slot, then enters from the 9th layer of the 36th slot, exits from the 10th layer of the 48th slot, then enters from the 9th layer of the 60th slot, exits from the 10th layer of the 72nd slot, then enters from the 9th layer of the 12th slot, exits from the 10th layer of the 25th slot, then enters from the 9th layer of the 37th slot, exits from the 10th layer of the 49th slot, then enters from the 9th layer of the 61st slot, exits from the 10th layer of the 1st slot, and so far, it is led out from the 10th layer of the 1st slot to form the outlet 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 1st layer of the 13th slot" means connecting the flat wire of the 1st layer of the 13th slot at the welding end, and "leading out from the 10th layer of the 1st slot" means connecting the flat wire of the 10th layer of the 1st slot at the welding end.

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

[0256] The lead-out line of the second sub-branch of the second branch of the U phase starts from the 8th layer of the 13th slot, enters from the 8th layer of the 13th slot, exits from the 7th layer of the 1st slot, then enters from the 8th layer of the 61st slot, exits from the 7th layer of the 48th slot, then enters from the 8th layer of the 36th slot, exits from the 7th layer of the 24th slot, then enters from the 8th layer of the 12th slot, exits from the 7th layer of the 72nd slot, then enters from the 8th layer of the 60th slot, exits from the 7th layer of the 47th slot, then enters from the 8th layer of the 35th slot, and exits from the 23rd slot. Exit from the 7th layer, then enter from the 8th layer of the 11th slot, exit from the 7th layer of the 71st slot, then enter from the 8th layer of the 59th slot, exit from the 7th layer of the 50th slot, then enter from the 8th layer of the 38th slot, exit from the 7th layer of the 26th slot, then enter from the 8th layer of the 14th slot, exit from the 7th layer of the 2nd slot, then enter from the 8th layer of the 62nd slot, exit from the 7th layer of the 49th slot, then enter from the 8th layer of the 37th slot, and exit from the 7th layer of the 25th slot, thus completing the traversal of the 7th and 8th layer flat wires.

[0257] The lead-out line of the third sub-branch of the second branch of the U phase starts from the 6th layer of the 13th slot, enters from the 6th layer of the 13th slot, exits from the 5th layer of the 2nd slot, then enters from the 6th layer of the 61st slot, exits from the 5th layer of the 49th slot, then enters from the 6th layer of the 36th slot, exits from the 5th layer of the 25th slot, then enters from the 6th layer of the 12th slot, exits from the 5th layer of the 1st slot, then enters from the 6th layer of the 60th slot, exits from the 5th layer of the 48th slot, then enters from the 6th layer of the 35th slot, and exits from the 24th slot. Exit from the 5th layer, then enter from the 6th layer of the 11th slot, exit from the 5th layer of the 72nd slot, then enter from the 6th layer of the 59th slot, exit from the 5th layer of the 51st slot, then enter from the 6th layer of the 38th slot, exit from the 5th layer of the 27th slot, then enter from the 6th layer of the 14th slot, exit from the 5th layer of the 3rd slot, then enter from the 6th layer of the 62nd slot, exit from the 5th layer of the 50th slot, then enter from the 6th layer of the 37th slot, and exit from the 5th layer of the 26th slot, thus completing the traversal of the 5th and 6th layer flat wires.

[0258] The lead-out line of the fourth sub-branch of the second branch of the U phase starts from the 4th layer of the 13th slot, enters from the 4th layer of the 13th slot, exits from the 3rd layer of the 1st slot, then enters from the 4th layer of the 61st slot, exits from the 3rd layer of the 48th slot, then enters from the 4th layer of the 36th slot, exits from the 3rd layer of the 24th slot, then enters from the 4th layer of the 12th slot, exits from the 3rd layer of the 72nd slot, then enters from the 4th layer of the 60th slot, exits from the 3rd layer of the 51st slot, then enters from the 4th layer of the 39th slot, and exits from the 27th slot. , then enter from the 4th layer of the 15th slot, exit from the 3rd layer of the 3rd slot, then enter from the 4th layer of the 63rd slot, exit from the 3rd layer of the 50th slot, then enter from the 4th layer of the 38th slot, exit from the 3rd layer of the 26th slot, then enter from the 4th layer of the 14th slot, exit from the 3rd layer of the 2nd slot, then enter from the 4th layer of the 62nd slot, exit from the 3rd layer of the 49th slot, then enter from the 4th layer of the 37th slot, and exit from the 3rd layer of the 25th slot, thus completing the traversal of the 3rd and 4th layer flat wires.

[0259] The lead-out line of the fifth sub-branch of the second branch of the U phase starts from the second layer of the 13th slot, enters from the second layer of the 13th slot, exits from the first layer of the 1st slot, then enters from the second layer of the 61st slot, exits from the first layer of the 52nd slot, then enters from the second layer of the 40th slot, exits from the first layer of the 28th slot, then enters from the second layer of the 16th slot, exits from the first layer of the 4th slot, then enters from the second layer of the 64th slot, exits from the first layer of the 51st slot, then enters from the second layer of the 39th slot, exits from the first layer of the 27th slot, and then enters from the second layer of the 15th slot. The flat wire enters from the first layer of the 3rd slot, then enters from the second layer of the 63rd slot, exits from the first layer of the 50th slot, then enters from the second layer of the 38th slot, exits from the first layer of the 26th slot, then enters from the second layer of the 14th slot, exits from the first layer of the 2nd slot, then enters from the second layer of the 62nd slot, exits from the first layer of the 49th slot, then enters from the second layer of the 37th slot, exits from the first layer of the 25th slot, and thus completes the traversal of the first and second layers of the flat wire. Thus far, it is led out from the first layer of the 25th slot to form the outlet 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 the V phase and the first branch of the W phase is Figure 9 to Figure 9b The connection method of the second branch of the V phase and the second branch of the W phase is Figure 10 to Figure 10b It can be obtained by translating based on the second branch of the U phase.

[0262] In one embodiment, the number of winding slots of the stator core is Z=72, the number of stator winding poles and the number of rotor poles are 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 for each phase winding is 3. Figures 11 to 13b Schematic diagram of the connection of three parallel branches of the U phase in this embodiment.

[0263] like Figure 3 , Figures 11 to 13b As shown, each winding slot contains L=10 layers of flat wires, the first layer is L1, the second layer is L2, the third layer is L3, the fourth layer is L4, the fifth layer is L5, the sixth layer is L6, the seventh layer is L7, the eighth layer is L8, the ninth layer is L9, and the tenth layer is 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 the positions of the flat wire layers that can be arranged, so the number of each parallel branch can maintain potential balance and no circulating current will be generated. The 10 layers of flat wires are divided into 4 groups, and T1, T2, T3, and T4 are 2, 3, 3, and 2 respectively, that is, T1 contains the 1st / 2nd layer of flat wires, T2 contains the 3rd / 4th / 5th layer of flat wires, T3 contains the 6th / 7th / 8th layer of flat wires, and T4 contains the 9th / 10th layer of flat wires. The flat wires of the T2 layer are staggered by one winding slot relative to the flat wires of the T1 layer clockwise along the circumference of the flat wire motor, and the flat wires of the T3 layer are staggered by one winding slot relative to the flat wires of the T2 layer in the same direction of the flat wire motor. The flat wires of the T4 layer are staggered by one winding slot relative to the flat wires of the T3 layer in the same direction of the flat wire motor, so that the winding can achieve a continuous short distance effect. The flat wires belonging to the same parallel branch are connected in sequence between each group to form a sub-branch of the branch.

[0265] The connection relationship of the windings is illustrated by the first parallel branch of the U phase: the lead-out wire at the head end is led out from the second layer of the 13th slot, and moves along the positive direction of the X-axis and the direction of increasing layers to reach the 10th layer of the 34th slot; the same layer is switched to the 46th slot, and then moves along the negative direction of the X-axis and the direction of decreasing layers to reach the 1st layer of the 13th slot; the same layer is switched to the 4th slot, and continues to move along the positive direction of the X-axis and the direction of increasing layers to reach the 10th layer of the 37th slot; the same layer is switched to the 49th slot, and moves along the negative direction of the X-axis and the direction of decreasing layers to reach the 1st layer; switch to the 26th slot at the same layer, and move along the positive direction of the X-axis and the direction of increasing layers to reach the 10th layer of the 59th slot; switch to the 71st slot at the same layer, and move along the negative direction of the X-axis and the direction of decreasing layers to reach the 1st layer of the 38th slot; switch to the 51st slot at the same layer, and continue to move along the positive direction of the X-axis and the direction of increasing layers to reach the 10th layer of the 12th slot; switch to the 24th slot at the same layer, and move along the negative direction of the X-axis and the direction of decreasing layers to reach the 1st layer of the 63rd slot. The same layer switching ends at the 1st slot, and the tail lead-out wire is led out from the 1st slot. The hairpin coils are respectively connected across the 2nd / 3rd layer, 4th / 5th layer, 6th / 7th layer, and 8th / 9th layer. The 10th layer is the hairpin coil of the same layer and only contains one span Z / 2p=12. The 1st layer contains 3 spans, which are Z / 2p+1=13, Z / 2p-q+1=9, and Z / 2p-q+2=10 respectively. There are a total of L / 2+3=8 types of hairpin coil line types.

[0266] Based on a similar connection method, the lead wire of the second branch of the U phase can be drawn from the second layer of the 61st slot, and the lead wire of the tail end can be drawn from the first layer of the 49th slot; the lead wire of the third branch of the U phase can be drawn from the second layer of the 37th slot, and the lead wire of the tail end can be drawn from the first layer of the 25th slot. The three-phase lead wires are located at the same layer at the bottom of the slot, and the branch lead wires are located at adjacent layers, which makes the busbar structure design simpler.

[0267] like Figures 11 to 13bAs shown, the T1-layer flat wire, the T2-layer flat wire, the T3-layer flat wire and the T4-layer flat wire respectively include different phase belts, each phase belt includes four adjacently arranged winding slots, the phase belt of the T2-layer flat wire is offset by one winding slot relative to the phase belt of the T1-layer flat wire, the phase belt of the T3-layer flat wire is offset by one winding slot relative to the phase belt of the T2-layer flat wire, and the phase belt of the T4-layer flat wire is offset by one winding slot relative to the phase belt of the T3-layer flat wire. For example, in a T1 layer flat wire, the 1st / 2nd layer flat wires in the 25th, 26th, 27th and 28th slots are a phase band, in a T2 layer flat wire, the 3rd / 4th / 5th layer flat wires in the 24th, 25th, 26th and 27th slots are a phase band, in a T3 layer flat wire, the 6th / 7th / 8th layer flat wires in the 23rd, 24th, 25th and 26th slots are a phase band, and in a T4 layer flat wire, the 9th / 10th layer flat wires in the 22nd, 23rd, 24th and 25th slots are a phase band.

[0268] like Figures 11 to 13b As shown, the solid line represents the wiring method of the crown end or the cross-line segment of the hairpin coil, and the dotted line represents the wiring method of the welding end or the welding segment of the hairpin coil.

[0269] Combine the following Figures 11 to 13b The wiring method of the two parallel branches of the U phase in the embodiment of the present application is described in detail. Figures 11 to 13b The solid line connection method shows the connection method of the stator winding at the crown end. The connection method of the welding end of the stator winding can refer to the dotted line connection method.

[0270] like Figure 11 to Figure 11b As shown, the first branch of phase U takes the second layer of slot 13 as the incoming line terminal U 1in , enter from the 2nd layer of the 13th slot, exit from the 3rd layer of the 24th slot, then enter from the 4th layer of the 36th slot, exit from the 5th layer of the 48th slot, then enter from the 6th layer of the 59th slot, exit from the 7th layer of the 71st slot, then enter from the 8th layer of the 11th slot, exit from the 9th layer of the 22nd slot, then enter from the 10th layer of the 34th slot, exit from the 10th layer of the 46th slot, then enter from the 9th layer of the 34th slot, exit from the 8th layer of the 23rd slot, then enter from the 7th layer of the 11th slot, exit from the 6th layer of the 71st slot, then enter from the 5th layer of the 60th slot, exit from the 48th slot, then enter from the 3rd layer of the 36th slot, exit from the 25th slot, then enter from the 1st layer of the 13th slot, exit from the 1st layer of the 4th slot, thus completing the first traversal of the flat wire from the 1st layer to the 10th layer.

[0271] Then enter from the 2nd floor of the 16th slot, exit from the 3rd floor of the 27th slot, then enter from the 4th floor of the 39th slot, exit from the 5th floor of the 51st slot, then enter from the 6th floor of the 62nd slot, exit from the 7th floor of the 2nd slot, then enter from the 8th floor of the 14th slot, exit from the 9th floor of the 25th slot, then enter from the 10th floor of the 37th slot, exit from the 10th floor of the 49th slot, then enter from the 9th floor of the 37th slot, exit from the 8th floor of the 26th slot, then enter from the 7th floor of the 14th slot, exit from the 6th floor of the 2nd slot, then enter from the 5th floor of the 63rd slot, exit from the 4th floor of the 51st slot, then enter from the 3rd floor of the 39th slot, exit from the 28th slot, then enter from the 1st floor of the 16th slot, exit from the 1st floor of the 26th slot. At this point, the second traversal is completed.

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

[0273] Then enter from the 2nd layer of the 63rd slot, exit from the 3rd layer of the 2nd slot, then enter from the 4th layer of the 14th slot, exit from the 5th layer of the 26th slot, then enter from the 6th layer of the 37th slot, exit from the 7th layer of the 49th slot, then enter from the 8th layer of the 61st slot, exit from the 9th layer of the 72nd slot, then enter from the 10th layer of the 12th slot, exit from the 10th layer of the 24th slot, then enter from the 9th layer of the 12th slot, exit from the 8th layer of the 1st slot, then enter from the 7th layer of the 61st slot, exit from the 6th layer of the 49th slot, then enter from the 5th layer of the 38th slot, exit from the 4th layer of the 26th slot, then enter from the 3rd layer of the 14th slot, exit from the 2nd layer of the 3rd slot, then enter from the 1st layer of the 63rd slot, exit from the 1st layer of the 1st slot, and thus lead out from the 1st layer of the 1st slot to form the outlet terminal U of the first branch of the U-phase winding. 1out .

[0274] It should be noted that in the above connection methods, for example, "entering from the 2nd layer of the 13th groove" means connecting the flat wire of the 2nd layer of the 13th groove at the welding end, and "leading out from the 1st layer of the 1st groove" means connecting the flat wire of the 1st layer of the 1st groove at the welding end.

[0275] like Figure 12 to Figure 12bAs shown, the second branch of phase U takes the second layer of slot 61 as the incoming line terminal U 2in , enter from the 2nd layer of the 61st slot, exit from the 3rd layer of the 72nd slot, then enter from the 4th layer of the 12th slot, exit from the 5th layer of the 24th slot, then enter from the 6th layer of the 35th slot, exit from the 7th layer of the 47th slot, then enter from the 8th layer of the 59th slot, exit from the 7th layer of the 70th slot, then enter from the 10th layer of the 10th slot, exit from the 10th layer of the 22nd slot, then enter from the 9th layer of the 10th slot, exit from the 8th layer of the 71st slot, then enter from the 7th layer of the 59th slot, exit from the 6th layer of the 47th slot, then enter from the 5th layer of the 36th slot, exit from the 4th layer of the 24th slot, then enter from the 3rd layer of the 12th slot, exit from the 2nd layer of the 1st slot, then enter from the 1st layer of the 61st slot, and exit from the 1st layer of the 52nd slot. This completes the first traversal of the flat wire from the 1st layer to the 10th layer.

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

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

[0278] Then enter from the 2nd layer of the 39th slot, exit from the 3rd layer of the 50th slot, then enter from the 4th layer of the 62nd slot, exit from the 5th layer of the 2nd slot, then enter from the 6th layer of the 13th slot, exit from the 7th layer of the 25th slot, then enter from the 8th layer of the 37th slot, exit from the 9th layer of the 48th slot, then enter from the 10th layer of the 60th slot, exit from the 10th layer of the 72nd slot, then enter from the 9th layer of the 60th slot, exit from the 8th layer of the 49th slot, then enter from the 7th layer of the 37th slot, exit from the 6th layer of the 25th slot, then enter from the 5th layer of the 14th slot, exit from the 4th layer of the 2nd slot, then enter from the 3rd layer of the 62nd slot, exit from the 2nd layer of the 51st slot, then enter from the 1st layer of the 39th slot, exit from the 1st layer of the 49th slot, and now lead out from the 1st layer of the 49th slot to form the outlet 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 2nd layer of the 61st slot" means connecting the flat wire of the 2nd layer of the 61st slot at the welding end, and "leading out from the 1st layer of the 49th slot" means connecting the flat wire of the 1st layer of the 49th slot at the welding end.

[0280] like Figure 13 to Figure 13b As shown, the third branch of phase U takes the second layer of slot 37 as the incoming line terminal U 3in , enter from the 2nd layer of the 37th slot, exit from the 3rd layer of the 48th slot, then enter from the 4th layer of the 60th slot, exit from the 5th layer of the 72nd slot, then enter from the 6th layer of the 11th slot, exit from the 7th layer of the 23rd slot, then enter from the 8th layer of the 35th slot, exit from the 9th layer of the 46th slot, then enter from the 10th layer of the 58th slot, exit from the 10th layer of the 70th slot, then enter from the 9th layer of the 58th slot, exit from the 8th layer of the 47th slot, then enter from the 7th layer of the 35th slot, exit from the 6th layer of the 23rd slot, then enter from the 5th layer of the 12th slot, exit from the 4th layer of the 72nd slot, then enter from the 3rd layer of the 60th slot, exit from the 2nd layer of the 49th slot, then enter from the 1st layer of the 37th slot, exit from the 1st layer of the 28th slot, thus completing the first traversal of the flat wire from the 1st layer to the 10th layer.

[0281] Then enter from the 2nd floor of the 40th slot, exit from the 3rd floor of the 51st slot, then enter from the 4th floor of the 63rd slot, exit from the 5th floor of the 3rd slot, then enter from the 6th floor of the 14th slot, exit from the 7th floor of the 26th slot, then enter from the 8th floor of the 38th slot, exit from the 9th floor of the 49th slot, then enter from the 10th floor of the 61st slot, exit from the 10th floor of the 1st slot, then enter from the 9th floor of the 61st slot, exit from the 8th floor of the 50th slot, then enter from the 7th floor of the 38th slot, exit from the 6th floor of the 26th slot, then enter from the 5th floor of the 15th slot, exit from the 4th floor of the 3rd slot, then enter from the 3rd floor of the 63rd slot, exit from the 2nd floor of the 52nd slot, then enter from the 1st floor of the 40th slot, exit from the 1st floor of the 50th slot. At this point, the second traversal is completed.

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

[0283] Then enter from the 2nd layer of the 15th slot, exit from the 3rd layer of the 26th slot, then enter from the 4th layer of the 38th slot, exit from the 5th layer of the 50th slot, then enter from the 6th layer of the 61st slot, exit from the 7th layer of the 1st slot, then enter from the 8th layer of the 13th slot, exit from the 9th layer of the 24th slot, then enter from the 10th layer of the 36th slot, exit from the 10th layer of the 48th slot, then enter from the 9th layer of the 36th slot, exit from the 8th layer of the 25th slot, then enter from the 7th layer of the 13th slot, exit from the 6th layer of the 1st slot, then enter from the 5th layer of the 65th slot, exit from the 4th layer of the 50th slot, then enter from the 3rd layer of the 38th slot, exit from the 2nd layer of the 26th slot, then enter from the 1st layer of the 15th slot, exit from the 1st layer of the 25th slot, and now it is led out from the 1st layer of the 25th slot to form the outlet 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 2nd layer of the 37th slot" means connecting the flat wire of the 2nd layer of the 37th 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.

[0285] Among them, the wiring method of the first branch of the V phase and the first branch of the W phase is Figure 11 to Figure 11b The connection method of the second branch of the V phase and the second branch of the W phase is Figure 12 to Figure 12b The wiring method of the third branch of the V phase and the third branch of the W phase can be obtained by translating the second branch of the U phase in Figure 13 to Figure 13b It can be obtained by translating based on the third branch of the U phase.

[0286] like Figures 5 to 13b As shown, from Example 1 to Example 4, it can be seen that the winding arrangement in the embodiments of the present application is applicable to both even layers with L / 2=odd number and even layers with L / 2=even number, which broadens the flexibility of winding design. Multiple flat wire groups are staggered by 1 winding slot, which is equivalent to a continuous short distance, and can simultaneously weaken the 6k±1 (k=1 or 2) harmonics of the winding, thereby improving the NVH performance. The flat wires in each parallel sub-winding of each phase are evenly distributed at different layers in each pole slot, and the back electromotive force and current of each parallel sub-winding are exactly the same, eliminating the additional copper loss of the winding circulation caused by the parallel connection of the windings, ensuring the uniformity of the winding temperature, and thus improving the life of the motor. The three-phase lead wires are located in the first layer or the Lth layer, or the three-phase lead wires are located in the same layer at the bottom of the slot, and the branch lead wires are located in adjacent layers, which can make full use of the radial space and simplify the Busbar structure. Each layer of hairpin coils is independent of each other, and there is no additional cross-layer hairpin coil. Fully automatic wire insertion can be achieved through independent wire cups, which simplifies the manufacturing process and facilitates mass production.

[0287] The flat wire motor, powertrain and electric vehicle provided in the embodiments of the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and embodiments of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific embodiments and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A flat wire motor, characterized in that: The flat wire motor is used to receive the drive of three-phase alternating current, wherein the three-phase alternating current includes a first-phase alternating current, a second-phase alternating current and a third-phase alternating current. The motor stator of the flat wire motor includes a plurality of groups of winding slots, each group of winding slots includes a plurality of winding slots sequentially arranged along the circumference of the flat wire motor, each of the winding slots is used to accommodate a plurality of flat wires, and a plurality of the winding slots adjacent to each other in sequence constitute a group of the winding slots, and each group of the winding slots includes: a first winding slot, wherein all the flat wires contained in the first winding slot are used to transmit a first phase of the three-phase alternating current; a plurality of second winding slots, wherein the plurality of second winding slots are arranged on one side of the first winding slot along the circumferential direction of the flat wire motor, a portion of the flat wires in each of the second winding slots are used to transmit the first-phase alternating current, and the remaining flat wires in each of the second winding slots are used to transmit the second-phase alternating current, and the number of flat wires in any one of the second winding slots used to transmit the first-phase alternating current is not equal to the difference between the numbers of flat wires in two adjacent second winding slots used to transmit the first-phase alternating current; A plurality of third winding slots, the number of the plurality of third winding slots is the same as the number of the plurality of second winding slots, the plurality of third winding slots are arranged along the circumferential direction of the flat wire motor on the other side of the one first winding slot, a portion of the flat wires in each of the third winding slots are used to transmit the first phase alternating current, the remaining flat wires in each of the third winding slots are used to transmit the third phase alternating current, and the number of flat wires used to transmit the first phase alternating current in any of the third winding slots is not equal to the difference in the number of flat wires used to transmit 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 flat wires in a plurality of the second winding slots in each group of the winding slots for transmitting the first-phase alternating current decreases in a counterclockwise direction; The number of flat wires in the third winding slots in each group of the winding slots for transmitting the first-phase alternating current increases in a counterclockwise direction.

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

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

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

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

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

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

9. The flat wire motor according to any one of claims 1 to 8, characterized in that: All the flat wires accommodated in 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, and the four adjacent groups of the flat wires are used to transmit one of the first-phase alternating current, the second-phase alternating current and the third-phase alternating current, and each group of the flat wires includes at least one flat wire accommodated in the same winding slot, wherein: The number of the flat wires in each group of the flat wires in at least one circle of the flat wires and an adjacent circle of the flat wires is different.

10. The flat wire motor according to claim 9, characterized in that: The multi-turn flat wire includes a first turn of flat wire and an N-th turn of flat wire, the distance between any one of the first turn of flat wire and the axis of the flat wire motor is greater than the distance between any one of the multi-turn flat wire except the first turn of flat wire and the axis of the flat wire motor, and the distance between any one of the N-th turn of flat wire and the axis of the flat wire motor is less than the distance between any one of the multi-turn flat wire except the N-th turn of flat wire and the axis of the flat wire motor, wherein: The number of flat wires in each group of the flat wires in the first circle of flat wires is the same as the number of flat wires in each group of the flat wires in the Nth circle of flat wires; The number of flat wires in each group of the flat wires in any circle of the flat wires between the first circle of the flat wires and the Nth circle of the flat wires is greater than the number of flat wires in each group of the flat wires in the first circle of the flat wires.

11. The flat wire motor according to any one of claims 1 to 10, characterized in that: Each group of the winding slots is composed of 7 adjacent winding slots in sequence, the number of the second winding slots is 3, each of the winding slots is used to accommodate 6 flat wires, the difference in the number of flat wires used to transmit the first-phase alternating current in two adjacent second winding slots in each group of winding slots is 2, and the number of flat wires used to transmit the first-phase alternating current in a second winding slot adjacent to a first winding slot is 1.

12. The flat wire motor according to any one of claims 1 to 11, characterized in that: Each group of the winding slots is composed of 7 adjacent winding slots in sequence, the number of the second winding slots is 3, each of the winding slots is used to accommodate 10 flat wires, the difference in the number of flat wires used to transmit the first-phase alternating current in two adjacent second winding slots in each group of the winding slots is 3, and the number of flat wires used to transmit the first-phase alternating current in a second winding slot adjacent to a first winding slot is 2.

13. The flat wire motor according to any one of claims 1 to 11, characterized in that: Each group of the winding slots is composed of 7 adjacent winding slots in sequence, the number of the second winding slots is 3, each of the winding slots is used to accommodate L flat wires, the number of flat wires used to transmit the first phase alternating current in each of the second winding slots is not equal to an integer multiple of L / 4, and the number of flat wires used to transmit the third phase alternating current in each of the third winding slots is not equal to an integer multiple of L / 4.

14. A powertrain, characterized in that: The power assembly includes a reducer and a flat wire motor as described in any one of claims 1 to 13, wherein the motor shaft of the flat wire motor is used for transmission connection to 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 in that: The electric vehicle comprises a frame, a power battery and a power assembly as described in claim 14, wherein the frame is used to fix the power battery and the power assembly, 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.

Images