Flat wire stator and motor

Abstract

The invention discloses a flat wire stator and a motor, the flat wire stator comprises a stator core and a stator winding, and the stator core is provided with a plurality of stator slots which are arranged at equal intervals along the circumferential direction and extend along the axial direction of the stator core; the stator winding comprises a three-phase winding, the three-phase winding comprises a plurality of coils, the plurality of coils are wound in the stator slots, each stator slot is provided with an even number of layers of PIN wires, lead-in wires and lead-out wires in the coils are arranged on the two layers of PIN wires on the outermost side, the outer side is one side far away from the inner diameter space of the stator iron core, and the stator winding is provided with a plurality of torsion head ends. And different torsion pitches are arranged among the plurality of torsion head ends. The multiple coils are evenly distributed in the circumferential direction of the stator core, balance of space and potential is achieved at the same time, the lead-in wire and the lead-out wire are arranged on the two layers of PIN wires on the outermost side, the arrangement of different torsion pitches is combined, the current path and the phase relation can be adjusted, electromagnetic interference is reduced, and the power factor and efficiency of the motor are improved.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a flat wire stator and a motor. Background Art

[0002] In the field of motors, with the rapid development of modern industry and technology, the requirements for motor performance are becoming increasingly stringent. The traditional round wire stator winding has a large gap between the wires, resulting in low space utilization, which in turn limits the improvement of the motor power density. The flat wire stator uses flat wires that can be arranged closely and effectively fill the stator slot space, significantly improving the filling rate of the winding. Under the same volume, the number of winding turns can be greatly increased, and the output power of the motor can be improved, meeting the urgent needs of modern industry for miniaturization and high power density of motors.

[0003] With the rapid development of new energy vehicles, industrial automation and other fields, more stringent requirements have been put forward for motor performance. As a core component, the motor needs to have high efficiency, high power density and good heat dissipation performance. The application of flat wire stators makes it possible to meet these requirements. Its compact structure and good electrical performance help to improve motor efficiency and reduce energy loss.

[0004] However, flat wire stators still face some problems in practical applications. Although flat wire stators have advantages in space utilization and power density, the existing flat wire stator design has deficiencies in magnetic field optimization. On the one hand, the traditional winding layout and torsion pitch setting method make the current distribution in the winding unreasonable, resulting in uneven magnetic field distribution, large electromagnetic interference, and reduced power factor and efficiency of the motor. On the other hand, when multi-phase windings work together, it is difficult to achieve precise spatial and potential balance, which further affects the overall performance of the motor.

[0005] Therefore, how to optimize the structural design of the flat wire stator to achieve a more uniform magnetic field distribution while ensuring the spatial and potential balance of the multi-phase windings has become a key issue that needs to be urgently addressed in the current development of flat wire stator technology. Summary of the invention

[0006] The purpose of the present application is to provide a flat wire stator and a motor, so as to optimize the structural design of the flat wire stator to achieve a more uniform magnetic field distribution, while ensuring the balance of multi-phase windings in space and potential.

[0007] To achieve the above objectives, the technical solution adopted in the present application is: to provide a flat wire stator, comprising: a stator core and a stator winding, the stator core is provided with a plurality of stator slots arranged equidistantly along the circumferential direction and extending axially along the stator core; the stator winding comprises a three-phase winding, the three-phase winding comprises a plurality of coils, the plurality of coils are wound in the stator slots, each of the stator slots is provided with an even number of layers of PIN wires, and the lead-in wires and lead-out wires in the coils are arranged on the two outermost layers of PIN wires, the outer side is a side away from the inner diameter space of the stator core, and the stator winding is provided with a plurality of twist head ends, and unequal torsional pitches are arranged between the plurality of twist head ends.

[0008] As a preference, each phase in the three-phase winding is arranged as a branch, and each branch is formed by connecting a PIN line spanning a full distance and a PIN line spanning a short distance.

[0009] As another preferred embodiment, the PIN wires are arranged in sequence from the outer side to the inner side along the radial direction of the stator core as follows: short-spacing PIN wires spanning 1-1 layers, full-spacing PIN wires spanning 1-2 layers, full-spacing PIN wires spanning 2-3 layers, full-spacing PIN wires spanning 3-4 layers and short-spacing PIN wires spanning 4-4 ​​layers, and the PIN wires include a first welding end, a first twist section, a first straight section, a U-shaped end, a second straight section, a second twist section and a second welding end connected in sequence.

[0010] It is further preferred that the twisting directions of the first twist section and the second twist section in the short-span PIN line spanning 1-1 layers and the short-span PIN line spanning 4-4 ​​layers are both in the same direction; the twisting directions of the first twist section and the second twist section in the full-span PIN line spanning 1-2 layers, the short-span PIN line spanning 2-3 layers and the full-span PIN line spanning 3-4 layers are both in opposite directions, respectively twisting towards both sides away from the center direction.

[0011] Further preferably, the first twist section and the second twist section in the short-span 1-1 layer PIN line twist in the same direction toward a first direction, and the first twist section and the second twist section in the short-span 4-4 layer PIN line twist in the same direction toward a second direction, and the first direction and the second direction are in opposite directions.

[0012] Further preferably, the winding group includes one to four layers of winding groups arranged in sequence from the outer side to the inner side, and the three-phase lead-out wires spanning 1-2 layers of PIN wires with a full pitch are all located in the winding group of the first layer.

[0013] Preferably, the star point lines of the three-phase windings are all located in the winding groups of the second layer.

[0014] Preferably, the short-spacing 4-4-layer PIN wires are arranged as the innermost same-layer PIN wires, and are all radially formed toward the inside, so that the short-spacing 4-4-layer PIN wires protrude toward the inner diameter space of the stator core.

[0015] Preferably, the pitch formed by the second twist section and the second welding end in the YI-type PIN wire of the full pitch spanning 1-2 layers is different from the pitch formed by the remaining twist sections and the welding ends.

[0016] Further preferably, a motor is provided, comprising: a motor rotor; and a motor stator, wherein the motor stator is connected to the motor rotor, and the motor stator is specifically the flat wire stator described in any one of the above items.

[0017] Compared with the prior art, the beneficial effects of this application are:

[0018] The stator core is preferably provided with 48 stator slots that are equidistantly arranged circumferentially and extend axially, and the flat wire stator is preferably provided with 4 layers of PIN wires, which are the first layer, the second layer, the third layer and the fourth layer radially from the outer island. Multiple coils are wound in the stator slots and the three-phase windings are evenly distributed, which can make the magnetic field distribution more uniform. Multiple coils are evenly distributed around the stator core, and the balance in space and potential is achieved at the same time. The lead-in wire and the lead-out wire are set on the two outermost layers of PIN wires. Combined with the non-equal torsion pitch setting, the current path and phase relationship can be adjusted, electromagnetic interference can be reduced, and the power factor and efficiency of the motor can be improved. The setting of non-equal torsion pitch makes the winding layout more compact, reduces the length and resistance of the flat wire, reduces copper loss, and improves the energy efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of a flat wire stator;

[0020] Figure 2 It is a structural schematic diagram of the welding side of the flat wire stator;

[0021] Figure 3 It is a schematic diagram of the structure of the U-shaped side of the flat wire stator;

[0022] Figure 4 It is a structural schematic diagram of the stator core;

[0023] Figure 5 It is a schematic diagram of the structure of a short-distance PIN line across 1-1 layers;

[0024] Figure 6 It is a schematic diagram of the structure of the PIN line across 1-2 layers with full pitch;

[0025] Figure 7 It is a schematic diagram of the structure of the PIN line across 2-3 layers with full pitch;

[0026] Figure 8 This is a schematic diagram of the structure of the full-pitch PIN line across 3-4 layers;

[0027] Fig. 9 It is a schematic diagram of the structure of a short-distance PIN line across 4-4 layers;

[0028] Fig.10 It is a schematic diagram of the structure of a YI-type full-pitch PIN line spanning 1-2 layers;

[0029] Fig.11 It is a structural schematic diagram of the lead-in line;

[0030] Fig.12 It is a schematic diagram of the structure of the lead wire;

[0031] Fig.13 It is a schematic diagram of the structure in which a YI-type full-pitch PIN wire spanning 1-2 layers is placed in the stator winding;

[0032] Fig.14 For wiring diagram.

[0033] In the figure: 1, flat wire stator; 10, stator core; 11, stator winding; 12, stator slot; 13, inner diameter space; 14, three-phase winding; 20a, short-distance PIN wire across 1-1 layer; 20b, full-distance PIN wire across 1-2 layers; 20c, full-distance PIN wire across 2-3 layers; 20d, full-distance PIN wire across 3-4 layers; 20e, short-distance PIN wire across 4-4 layers; 20f, YI-type full-distance PIN wire across 1-2 layers; 20g, lead-in wire; 20h, lead-out wire; 21, first welding end; 22, first twist section; 23, first straight section; 24, U-shaped end; 25, second straight section; 26, second twist section; 27, second welding end. DETAILED DESCRIPTION

[0034] Below, the present application is further described in conjunction with specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0035] In the description of the present application, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present application.

[0036] It should be noted that the terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0037] The terms "including" and "having" and any variations thereof in the specification and claims of this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0038] In a preferred embodiment, see Figures 1 to 13 The present application document provides a flat wire stator 1, comprising: a stator core 10 and a stator winding 11, the stator core 10 is provided with a plurality of stator slots 12 which are arranged equidistantly along the circumferential direction and extend axially along the stator core 10; the stator winding 11 comprises a three-phase winding 14, the three-phase winding 14 comprises a plurality of coils, the plurality of coils are wound in the stator slots 12, each stator slot 12 is provided with an even number of layers of PIN wires, and the lead-in wire 20g and the lead-out wire 20h in the coil are arranged on the outermost two layers of PIN wires, the outer side is a side away from the inner diameter space 13 of the stator core 10, and the stator winding 11 is provided with a plurality of torsion heads, and non-equal torsion pitches are arranged between the plurality of torsion heads.

[0039] Specifically, the stator core 10 in the present application document is preferably provided with 48 stator slots 12 that are equidistantly arranged circumferentially and extend axially, and the flat wire stator 1 is preferably provided with 4 layers of PIN wires, which are the first layer, the second layer, the third layer and the fourth layer radially from the outer island. Multiple coils are wound in the stator slots 12 and the three-phase windings 14 are evenly distributed, which can make the magnetic field distribution more uniform. Multiple coils are evenly distributed circumferentially on the stator core 10, and the balance in space and potential is achieved at the same time. The lead-in wire 20g and the lead-out wire 20h are set on the outermost two layers of PIN wires. Combined with the non-equal torsion pitch setting, the current path and phase relationship can be adjusted, electromagnetic interference can be reduced, and the power factor and efficiency of the motor can be improved. At the same time, each stator slot 12 is provided with an even number of layers of PIN wires, which increases the number of winding turns, and can increase the output power of the motor under the same volume, improve the power density, and meet the needs of miniaturization and high performance of the equipment.

[0040] Furthermore, the setting of unequal torsion pitch makes the winding layout more compact, reduces the length and resistance of the flat wire, reduces copper loss, and improves the energy efficiency of the motor.

[0041] The lead-in wire 20g and the lead-out wire 20h are arranged on the two outermost layers of PIN wires, which facilitates the connection of external circuits and reduces the manufacturing difficulty and cost. The clear line layout also facilitates troubleshooting and maintenance.

[0042] As a preferred embodiment, each phase of the three-phase winding 14 is provided as a branch, and each branch is formed by connecting a PIN line spanning a full distance and a PIN line spanning a short distance.

[0043] As another preferred embodiment, the PIN wires are arranged in sequence from the outside to the inside of the stator core 10 radially as follows: a short-distance PIN wire 20a spanning 1-1 layers, a full-distance PIN wire 20b spanning 1-2 layers, a full-distance PIN wire 20c spanning 2-3 layers, a full-distance PIN wire 20d spanning 3-4 layers, and a short-distance PIN wire 20e spanning 4-4 ​​layers, and the PIN wire includes a first welding end 21, a first twist section 22, a first straight section 23, a U-shaped end 24, a second straight section 25, a second twist section 26, and a second welding end 27 connected in sequence, and the routing of the stator winding 11 is as follows: Fig.14 Wiring diagram shown.

[0044] The combination of PIN wires with different spans, i.e., the combination of short-span and full-span PIN wires, helps to make the magnetic field distribution in the motor more uniform. The short-span PIN wires 20a spanning 1-1 layers and the PIN wires spanning 4-4 ​​layers, as well as the full-span PIN wires spanning 1-2 layers, 2-3 layers, and 3-4 layers, generate magnetic fields in the stator core 10 that cooperate with each other, reducing the distortion and unevenness of the magnetic field, thereby improving the efficiency and output torque of the motor after being applied to the motor.

[0045] Arranging the PIN wires of different cross-layers in order from the outside to the inside can make full use of the radial space of the stator core 10, making the winding structure more compact. This compact design helps to reduce the volume and weight of the motor, meeting the needs of modern industry for miniaturization and lightweight motors. At the same time, the PIN wires of different cross-layers are reasonably distributed in space to avoid mutual interference between the windings. Each PIN wire has its specific position and direction, making the arrangement of the windings in the stator slot 12 more orderly, reducing the space waste and the possibility of electrical failure caused by winding crossing and overlapping.

[0046] The PIN line uniformly adopts the structure of the first welding end 21, the first twist section 22, the first straight section 23, the U-shaped end 24, the second straight section 25, the second twist section 26 and the second welding end 27 connected in sequence, which is conducive to standardized production. At the same time, when the motor fails, this clear PIN line structure and arrangement method facilitates technicians to troubleshoot and repair the fault. The position and connection method of each PIN line have a regular pattern, which can quickly locate the fault point and shorten the repair time and cost.

[0047] The U-shaped end 24 of the PIN wire can be effectively fixed in the slot of the stator core 10 , and the first straight segment 23 and the second straight segment 25 are respectively inserted into the corresponding stator slot 12 layers. This structural design enables the PIN wire to have better mechanical stability in the stator core 10 .

[0048] It is further preferred that the twisting directions of the first twist section 22 and the second twist section 26 in the short-distance PIN line 20a spanning 1-1 layers and the short-distance PIN line 20e spanning 4-4 ​​layers are all in the same direction; the twisting directions of the first twist section 22 and the second twist section 26 in the full-distance PIN line 20b spanning 1-2 layers, the short-distance PIN line spanning 2-3 layers and the full-distance PIN line 20d spanning 3-4 layers are all in opposite directions, respectively twisting towards both sides away from the center direction.

[0049] Among them, the first and second twist sections of the short-span PIN wires spanning 1-1 layers and spanning 4-4 ​​layers are twisted in the same direction, and the first and second twist sections of the full-span PIN wires 20d spanning 1-2 layers, the short-span PIN wires spanning 2-3 layers, and the full-span PIN wires spanning 3-4 layers are twisted in opposite directions. This setting can make the magnetic fields generated by different PIN wires cooperate and offset each other, reducing the interference between the magnetic fields. At the same time, different twisting directions will affect the distribution of current in the PIN wires. By reasonably setting the twisting direction of the PIN wires in this application document, the current can be more evenly distributed in the winding, avoiding current concentration in certain parts and causing local overheating, thereby improving the reliability and stability of the flat wire stator 1.

[0050] Furthermore, the short-spacing PIN wires across 1-1 layers and across 4-4 layers are twisted in the same direction in opposite directions, and the full-spacing and partial short-spacing PIN wires are twisted in opposite directions. This layout enables the windings to be arranged more compactly in the stator core 10. The PIN wires with different twisting directions are staggered with each other, making full use of the space in the stator slots 12, reducing the gaps between the windings, and thereby increasing the number of turns of the windings in a limited space.

[0051] Further preferably, the first twist section 22 and the second twist section 26 in the short-distance PIN line 20a spanning 1-1 layers twist in the same direction toward the first direction, and the first twist section 22 and the second twist section 26 in the short-distance PIN line 20e spanning 4-4 ​​layers twist in the same direction toward the second direction, and the first direction and the second direction are in opposite directions.

[0052] Among them, the first and second twist sections of the short-distance PIN wire 20a across the 1-1 layer and the PIN wire across the 4-4 layer twist in the same direction in opposite directions, respectively, so that the direction and distribution of the magnetic field they generate are more reasonable, which helps to reduce the mutual interference of the magnetic fields and make the magnetic field distribution in the entire stator more uniform. The uniform magnetic field distribution can effectively reduce the energy loss of the motor, improve the efficiency and power factor of the motor, and thus improve the overall performance of the motor.

[0053] Specifically, the first and second twist sections of the short-distance 1-1 layer PIN wire 20a and the 4-4 layer PIN wire twist in opposite directions to avoid the mutual interference of the two PIN wires in space. In the motor manufacturing process, the installation and arrangement of the windings need to be precisely controlled. If interference occurs between the PIN wires, it will not only increase the manufacturing difficulty, but also may affect the performance and reliability of the motor. This setting allows the PIN wires to be arranged in an orderly manner, ensuring the neatness and stability of the windings.

[0054] Furthermore, the short-distance PIN wire 20a across the 1-1 layer and the PIN wire across the 4-4 layer are twisted in the same direction in opposite directions, so that they can restrain each other when subjected to electromagnetic force and mechanical vibration, thereby enhancing the overall structural stability of the winding, which helps to reduce deformation and looseness of the winding.

[0055] Preferably, the first straight segment 23 and the second straight segment 25 are respectively inserted into the slot layer of the corresponding stator slot 12, the U-shaped end 24 is located on the U-shaped side of the stator core 10, and the first welding end 21, the first twist segment 22, the second twist segment 26, and the second welding end 27 are located on the welding side of the stator core 10. At the same time, the first twist segment 22 and the second twist segment 26 are twisted after the PIN wire is inserted into the stator slot 12 of the stator core 10, and each PIN wire is welded and connected through the corresponding first welding end 21 or the second welding end 27.

[0056] More preferably, the winding group includes one to four layers of winding groups arranged in sequence from the outside to the inside, and the three-phase lead wires 20h that span 1-2 layers of PIN wires 20b are all located in the first layer of the winding group.

[0057] Preferably, the three-phase winding 14 in the present application document adopts a star (Y-type) connection, and the ends of the three windings converge to a common point. The connecting line of this point is the "star point line", and the star point lines of the three-phase winding 14 are all located in the winding group of the second layer. Specifically, the star point line usually does not carry external current. When it is placed in the second layer, the space utilization can be optimized, and the electromagnetic balance and potential symmetry of the winding can be achieved through a layered layout, reducing magnetic field interference. The first layer is used to arrange the lead wires 20h that need to be frequently connected to the external circuit, and the second layer is used for the star point line to avoid the crossing of the wire bundle and improve the compactness of the structure. The lead wires 20h in the first layer can reduce the electromagnetic interference to the internal winding. The star point line is set in the second layer to help balance the magnetic field distribution of the three-phase winding 14 and reduce the harmonic content.

[0058] Preferably, the short-spacing 4-4-layer PIN wires 20 e are arranged as the innermost PIN wires of the same layer, and are all formed radially inward, so that the short-spacing 4-4-layer PIN wires 20 e protrude toward the inner diameter space 13 of the stator core 10 .

[0059] The PIN wires of the innermost layer, i.e. the fourth layer, protrude toward the inner diameter, which can avoid physical interference with the outer windings, release more radial space, and make room for the rotor or heat dissipation structure. It is especially suitable for high-power density motors (such as new energy vehicle drive motors) that require efficient layout in limited space.

[0060] The short-spacing 4-4-layer PIN wire 20e inner side molding can enhance the fit between the winding and the stator core 10, reduce the winding displacement caused by centrifugal force during high-speed operation, reduce vibration and noise, and the compact layout of the short-spacing coil further enhances the structural rigidity to adapt to high-speed or frequent start-stop conditions.

[0061] Preferably, see Fig.10 and Fig.13 The pitch formed by the second twist section 26 and the second welding end 27 in the YI-type full-pitch 1-2 layer PIN wire 20f is different from the pitch formed by the other twist sections and welding ends, where the pitch refers to the twisting angle and distance of the PIN wire twist end in the flat wire winding, and it should be noted that the second twist section 26 and the second welding end 27 constitute the above-mentioned twist end.

[0062] More specifically, see Fig.13 The torsion angle of the YI-type full-pitch 1-2-layer PIN wire 20f is different from that of the remaining full-pitch 1-2-layer PIN wires 20b adjacent to it, that is, the torsion angle of the second twisting section 26 is different from the others, and the tilt angle can be adjusted.

[0063] At the same time, the physical distance of the twist end of the YI-type full-pitch PIN wire 20f across 1-2 layers is different from that of other PIN wires, which is specifically manifested in the differentiated design of the space interval (slot pitch) between the second welding end 27 and the adjacent second straight line segment 25. Preferably, the space interval between the second welding end 27 of the YI-type full-pitch PIN wire 20f across 1-2 layers and the adjacent second straight line segment 25 in the present application document is one unit, while the space interval between the second welding end 27 of the remaining full-pitch PIN wire 20b across 1-2 layers and the adjacent second straight line segment 25 is two units. Such a setting can optimize electromagnetic performance. The differentiated pitch adjusts the phase distribution of the coil to weaken the superposition effect of high-order harmonics. The asymmetric distance design balances the inductance distribution of the three-phase winding 14, reduces electromagnetic imbalance, and thus reduces iron loss and copper loss. When applied to the motor, the motor efficiency is improved, especially under high-speed or high-load conditions.

[0064] At the same time, the YI type full-pitch winding itself has a high induced electromotive force, but the traditional uniform pitch is prone to cause local concentration of the magnetic field. Therefore, this application document uses differentiated pitches to adjust the magnetic field path, make the air gap magnetic field distribution more uniform, reduce leakage magnetic flux, and improve torque output stability. The pitch of the YI type full-pitch PIN wire 20f across 1-2 layers is different from that of other twisted ends, which can achieve spatial staggered arrangement, improve the compactness of the flat wire stator 1, avoid radial or circumferential overlap of multi-layer welding ends, release more space, and effectively reduce wire crossing and reduce short circuit risks, which is especially important in high-density flat wire windings, thereby improving power density and meeting the needs of miniaturized motors, such as new energy vehicle drive motors.

[0065] Furthermore, the setting of the twisted head end of the YI-type full-pitch PIN wire 20f across 1-2 layers is coordinated with the inner layer molding design, and combined with the inner protruding structure of the short-pitch PIN wire across 4-4 layers, the differentiated pitch further optimizes the spatial matching of the inner and outer layer windings to avoid mechanical interference.

[0066] Differentiated pitches disperse the welding ends circumferentially or radially, making it easier to position automated welding tools, reducing blind spots, simplifying the manufacturing process, avoiding concentrated welding heat, and reducing the risk of insulation layer damage. Since the stator slots 12 of this application are preferably 48 axially arranged, if all welding ends have the same pitch, dense welding points may cause excessive local temperature rise, while differentiated pitches can disperse thermal stress. Different torsion angles and distances can be adapted to the step-by-step twisting process, processing the outer PIN line first and then the inner layer to reduce tool interference.

[0067] Furthermore, in this application document, the deformation resistance of the winding is enhanced by differentiated torsion angles. Through differentiated pitch design of torsion angle and physical distance, YI-type full-pitch PIN wire is combined with an even four-layer PIN wire to maximize space efficiency and achieve process and reliability upgrades. This design is a key technological breakthrough for the evolution of flat wire motors towards high performance, high density and high reliability.

[0068] Further preferably, a motor is provided, the motor comprising: a motor rotor; a motor stator, the motor stator is connected to the motor rotor, and the motor stator is specifically any one of the flat wire stators 1 described above.

[0069] The above describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and the specification only describe the principles of the present application. The present application may have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements fall within the scope of the present application for which protection is sought. The scope of protection claimed by the present application is defined by the attached claims and their equivalents.

Claims

1. A flat wire stator, characterized in that: include: A stator core and a stator winding, wherein the stator core is provided with a plurality of stator slots which are arranged equidistantly in the circumferential direction and extend axially along the stator core; The stator winding includes a three-phase winding, and the three-phase winding includes a plurality of coils. The plurality of coils are wound in the stator slots, and each stator slot is provided with an even number of layers of PIN wires, and the lead-in wires and lead-out wires in the coils are provided on the two outermost layers of PIN wires, and the outer side is a side away from the inner diameter space of the stator core, and the stator winding is provided with a plurality of twist head ends, and unequal torsion pitches are provided between the plurality of twist head ends.

2. The flat wire stator according to claim 1, characterized in that: Each phase of the three-phase winding is provided as a branch, and each branch is formed by connecting a PIN line spanning a full distance and a PIN line spanning a short distance.

3. The flat wire stator according to claim 2, characterized in that: The PIN wires are arranged in sequence from the outer side to the inner side along the radial direction of the stator core as follows: short-spacing PIN wires spanning 1-1 layers, full-spacing PIN wires spanning 1-2 layers, full-spacing PIN wires spanning 2-3 layers, full-spacing PIN wires spanning 3-4 layers, and short-spacing PIN wires spanning 4-4 ​​layers, and the PIN wires include a first welding end, a first twist section, a first straight section, a U-shaped end, a second straight section, a second twist section, and a second welding end connected in sequence.

4. The flat wire stator according to claim 3, characterized in that: The first twisting section and the second twisting section in the short-distance PIN line spanning 1-1 layers and the short-distance PIN line spanning 4-4 ​​layers twist in the same direction; The first twisting section and the second twisting section in the full-spacing 1-2-layer PIN line, the short-spacing 2-3-layer PIN line, and the full-spacing 3-4-layer PIN line all twist in opposite directions, respectively twisting toward both sides away from the center.

5. The flat wire stator according to claim 4, characterized in that: The first twist section and the second twist section in the short-distance PIN line spanning 1-1 layers twist in the same direction toward the first direction, and the first twist section and the second twist section in the short-distance PIN line spanning 4-4 ​​layers twist in the same direction toward the second direction, and the first direction and the second direction are in opposite directions.

6. The flat wire stator according to claim 3, characterized in that: The winding group includes one to four layers of winding groups arranged in sequence from the outer side to the inner side, and the three-phase lead-out wires spanning 1-2 layers of PIN wires with a full pitch are all located in the winding group of the first layer.

7. The flat wire stator according to claim 6, characterized in that: The star point lines of the three-phase windings are all located in the winding group of the second layer.

8. The flat wire stator according to claim 5, characterized in that: The short-spacing 4-4-layer PIN wires are arranged as the innermost same-layer PIN wires, and are all radially formed toward the inner side, so that the short-spacing 4-4-layer PIN wires protrude toward the inner diameter space of the stator core.

9. The flat wire stator according to claim 5, characterized in that: The pitch formed by the second twist section and the second welding end in the YI-type PIN line of full pitch spanning 1-2 layers is different from the pitch formed by the other twist sections and the welding ends.

10. A motor, characterized in that: The motor comprises: Motor rotor; A motor stator, wherein the motor stator is connected to the motor rotor, and the motor stator is specifically a flat wire stator as described in any one of claims 1-9.

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