Stator of a flat wire motor

Abstract

A novel stator of a flat wire motor, the stator comprising a stator core and a winding, the winding being composed of a plurality of flat wire conductors, the inner wall of the stator core being provided with a plurality of axially penetrating stator slots evenly arranged in the circumferential direction, the winding being a three-phase winding connected in a star shape, each phase winding being wound around the stator core to form each winding layer, each winding being wound around twice in each winding layer, and the staggered arrangement of the windings between the first circle and the second circle, thereby improving the efficiency of the motor and reducing the current loss, different lengths of raw materials used for the flat wire conductors at different connection positions, different wiring connections being realized by additionally increasing or decreasing the length, and no additional other line types being required, the welding position of the flat wire conductor and the wiring position of each phase winding being placed on the same side of the stator, thereby effectively saving the axial space of the motor, thereby increasing the torque density and power density of the motor.

Description

Technical Field

[0001] The invention relates to a motor stator, and more particularly to a motor stator whose winding is a flat wire winding. Background Art

[0002] With the development of new energy vehicles and the increasing maturity of the market, the motor, as the main power source of new energy vehicles, especially the only power source of pure electric vehicles, has higher and higher requirements for torque density, power density and efficiency to meet the requirements of new energy vehicle power and economy. Due to the dual pressure of performance and cost, the contradiction between the performance and size of the motor has become increasingly prominent.

[0003] For permanent magnet synchronous motors, especially automotive permanent magnet synchronous motors, placing flat wire windings, i.e. rectangular conductors, in the stator slots can effectively increase the stator slot fill rate and material utilization of the stator, thereby reducing the copper loss of the motor to improve the efficiency of the motor. At the same time, the end height of the motor winding coil can be effectively reduced, thereby saving the volume of the motor. However, compared with traditional round wire windings, the coil winding of flat wire windings still has many difficulties in winding off the line, and it is difficult to use machinery to automatically complete the winding off the line process.

[0004] To this end, the prior art has made many improvements to the flat wire winding, but there are still some shortcomings: Patent document CN200780022091.7 proposes a flat wire stator, but the motor flat wire has many linear shapes, and the wiring between windings of different phases requires additional conductors, which will further increase the mold cost and process cost; Patent document CN201710878010.9 proposes a flat wire stator, which optimizes the linear shape of the flat wire and reduces the types of linear shapes, but the lead wires of its motor are relatively complicated, and the motor stator still needs to increase the height of the welding side solder joint and the height of the bending side outlet respectively; Patent document CN201910367345.3 proposes a flat wire stator, which bends a group of flat wire conductors together on one side and then bends and welds them separately on the other side, thus avoiding increasing the height of the welding side solder joint and the height of the bending side lead wire and outlet respectively, but because the flat wire conductors are bent together on one side, the stretchability of the motor flat wire conductors and the adhesion ability of the paint film face great challenges.

[0005] In view of the above problems, the present invention proposes a stator for a flat wire motor, which improves the motor efficiency by designing a new winding method, and solves the problem of increasing the height of the welding point on the welding side and the height of the lead wire and the outlet wire on the bending side of the flat wire stator, and controls the number of linear shapes of the flat wire conductor, reduces the number of flat wire conductor forming molds, thereby reducing the overall production difficulty and cost of the motor. Summary of the invention

[0006] The object of the present invention is to provide a stator for a flat wire motor.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A stator of a flat wire motor, wherein the number of slots per pole per phase of the motor is defined as 2, the number of pole pairs is p, the stator comprises a stator core and a winding, the winding is composed of a plurality of flat wire conductors, wherein:

[0009] The stator has one axial end which is a bent end and the other end which is a free end;

[0010] The cross section of the stator core is annular, and the inner wall of the stator core is evenly provided with z axially penetrating stator slots along the circumferential direction, and z=12p is satisfied;

[0011] The winding is a three-phase winding connected in star shape, and the three-phase winding includes a U-phase winding, a V-phase winding and a W-phase winding;

[0012] Each of the flat wire conductors is formed by bending a flat wire through a mold, and the bending shape of the flat wire conductor is a hairpin shape. Each flat wire conductor consists of a bending portion, two straight portions and two rear bending portions, wherein the bending portion is formed by bending the flat wire at the middle position to form the angle portion of the hairpin-shaped flat wire conductor, and the two rear bending portions are formed by bending the head and tail ends of the flat wire in opposite directions to form the legs on both sides of the opening of the hairpin-shaped flat wire conductor. The two straight portions are parallel to each other in the flat wire conductor, and one end of each of the two straight portions is connected to the bending portion, and the other end is connected to a rear bending portion to form the straight sections on both sides of the hairpin-shaped flat wire conductor;

[0013] In the installed state, in each of the flat wire conductors, the straight portions are arranged in the stator slots along the axial direction of the stator core, the bent portions are arranged at the bent ends of the stator, and the rear bent portions are arranged at the free ends of the stator. When observing the end face of the free end of the stator, of the two rear bent portions of the same flat wire conductor, one rear bent portion is bent clockwise toward the end face based on the straight portion connected thereto, and the other rear bent portion is bent counterclockwise toward the end face based on the straight portion connected thereto, wherein the clockwise bent rear bent portion is welded to the counterclockwise bent rear bent portion of an adjacent flat wire conductor, and the counterclockwise bent rear bent portion is welded to the clockwise bent rear bent portion of another adjacent flat wire conductor, and each phase winding is formed in this connection manner, and each phase winding is sequentially arranged in a plurality of the stator slots along the circumferential direction of the stator core;

[0014] When the stator is observed from the perspective of its cross section, the straight section of each flat wire conductor forms a multi-layer structure from outside to inside in the stator slot along the radial direction of the stator core, and the number of layers is arranged from outside to inside in the radial direction of the stator core as the first layer, the second layer, the third layer, the fourth layer to the 4nth layer, where n is a positive integer, wherein the first layer and the second layer in all the stator slots are defined as the first winding layer, the third layer and the fourth layer in all the stator slots are defined as the second winding layer, and so on;

[0015] In the three-phase winding, each phase winding is arranged in the first winding layer along the circumferential direction for two turns, forming the first turn of the first winding layer and the second turn of the first winding layer, and then crosses to the second winding layer and is arranged in the circumferential direction for two turns, forming the first turn of the second winding layer and the second turn of the second winding layer, and is arranged cyclically in each winding layer until each stator slot of each layer of the stator core is filled with the three-phase winding, wherein:

[0016] The two straight portions in each flat wire conductor are located in two different stator slots, and the two different stator slots are separated by z / 2p stator slots in the circumferential direction, and the two straight portions are located in different layers of the same winding layer;

[0017] In each winding layer, two adjacent straight line portions in two adjacent flat wire conductors in the same turn are located in two different stator slots, and the two different stator slots are separated by z / 2p stator slots in the circumferential direction, and the two straight line portions are located in different layers of the same winding layer;

[0018] In each winding layer, two adjacent straight portions of two adjacent flat wire conductors between a first turn and a second turn are located in two different stator slots, and the two different stator slots are circumferentially spaced apart by z / 2p-1 stator slots, and the two straight portions are located in different layers of the same winding layer;

[0019] Two adjacent straight line portions in two adjacent flat wire conductors between different winding layers are located in two different stator slots, and the two different stator slots are spaced apart by z / 2p stator slots in the circumferential direction, and the two straight line portions are in adjacent layers.

[0020] Preferably, the rear bending parts of the flat wire conductor are arranged in order from long to short according to different unfolding lengths: the outlet end, the neutral point end, the conventional end and the short span end, and the flat wire conductors thus formed are classified as follows:

[0021] The first flat wire conductor has two rear bent portions which are both regular ends;

[0022] A second flat wire conductor, one rear bent portion of which is a regular end and the other rear bent portion of which is a short span end;

[0023] A third flat wire conductor, one rear bent portion of which is a normal end and the other rear bent portion of which is a neutral point end;

[0024] A fourth flat wire conductor, one rear bent portion of which is a regular end, and the other rear bent portion of which is an outlet end;

[0025] The second flat wire conductor corresponds to two adjacent flat wire conductors between the first circle and the second circle in each winding layer, and the straight line portions corresponding to the two adjacent short span ends of the two adjacent second flat wire conductors are located in two different stator slots, and the two different stator slots are separated by z / 2p-1 stator slots in the circumferential direction, and the two straight line portions are located in different layers of the same winding layer;

[0026] The third flat wire conductor is used as the connection at the neutral point in the star-connected structure of the three-phase winding, and the neutral point end corresponds to the neutral point of the three-phase winding;

[0027] The fourth flat wire conductor is used as the connection at the lead-out line in the structure of the three-phase winding star connection, and the lead-out line end corresponds to the lead-out line of the three-phase winding;

[0028] The first flat wire conductor acts on the remaining portion of the three-phase winding.

[0029] Preferably, the spacing between the two straight parts of the flat wire conductor of the three-phase winding at different turns is different. Since the three-phase winding is wound around the stator core from the outside to the inside in the radial direction, its circumferential dimension is also shortened when the number of turns increases. Therefore, the spacing between the two straight parts of the flat wire conductor of the first turn is greater than the spacing between the two straight parts of the flat wire conductor of the second turn, and the spacing between the two straight parts of the flat wire conductor of the second turn is greater than the spacing between the two straight parts of the flat wire conductor of the third turn, and by analogy, each turn is provided with a first flat wire conductor, a second flat wire conductor, a third flat wire conductor and a fourth flat wire conductor.

[0030] Preferably, in the three-phase winding, the outlet end of the fourth flat wire conductor of each phase is welded and connected at the free end, and the neutral point end of the third flat wire conductor of each phase is connected at the free end via a copper ring.

[0031] Preferably, the copper ring is an arc-shaped flat sheet, a welding hole is provided on the copper ring, and all the neutral point ends are welded in the welding hole.

[0032] Preferably, the distance between two straight parts of the flat wire conductor in different winding layers of the three-phase winding is different, the distance between two straight parts of the flat wire conductor in the first winding layer is greater than the distance between two straight parts of the flat wire conductor in the second winding layer, and so on.

[0033] Preferably, the stator slots of the stator core are rectangular.

[0034] Preferably, the stator core has weld grooves and key grooves on its outer circumference.

[0035] Preferably, a layer of insulating powder is coated on the free end of the flat wire conductor and on the copper ring.

[0036] The relevant contents in the above technical solution are explained as follows:

[0037] 1. In the above scheme, in each winding layer, the number of stator slots between the two adjacent straight sections in each two adjacent flat wire conductors located in the same circle is one more than the number of stator slots between the two adjacent straight sections in the two adjacent flat wire conductors located between the first circle and the second circle, thereby making the flat wire conductors of each three-phase winding staggered. This way of arranging the windings can improve the motor efficiency and reduce copper loss and AC resistance loss.

[0038] 2. In the above scheme, the flat wire conductor is classified into a first flat wire conductor, a second flat wire conductor, a third flat wire conductor and a fourth flat wire conductor according to the different unfolded lengths of the rear bending parts thereof. Adjacent flat wire conductors are welded and connected via adjacent rear bending parts to form windings of each phase. By relying on the different lengths of the rear bending parts of different types of flat wire conductors, conventional connection, short span connection, neutral point connection and lead-out line connection are achieved. There is no need to add additional flat wire conductors dedicated to the connection, and the number of line types is small and the processing is simple.

[0039] 3. In the above scheme, since the present invention uses a staggered winding method and various types of flat wire conductors with different lengths of the rear bending parts, the free end of the stator can be used as the welding connection side of each flat wire conductor, and can also be used as the wiring side of each fourth flat wire conductor outlet end and each third flat wire conductor neutral point end. The welding position and the wiring position are placed on the same side, so that the bending end can have a shorter end height, and the free end simultaneously performs the functions of welding and wiring. Such an arrangement can save the axial space of the motor, increase the torque density and power density of the motor, and achieve the purpose of reducing costs.

[0040] 4. In the above scheme, the closer the two adjacent stator slots in the stator core are to the stator core axis, the closer the distance between the two stator slots is. Since the straight portion of each flat wire conductor forms a multi-layer structure from the outside to the inside in the stator slot, when the number of layers increases, the radial distance of the flat wire conductor from the stator axis is shortened, so that although the two straight portions in the flat wire conductor are separated by the same number of stator slots, the spacing between the two straight portions is still shortened as the number of layers increases. In addition, the present invention realizes connections with different functions by relying on different lengths of the rear bending portions of different types of flat wire conductors, and transforms the original connection of different functions of the flat wire conductors that is realized by different spans of the straight portion into that realized by different lengths of the rear bending portion. The flat wire conductors thus obtained have only one difference except for the different lengths of the rear bending portions, that is, due to being placed in different The reasons in the same winding layer cause the distance between the two straight parts of the flat wire conductor to be different, and the difference in the length of the bent part does not need to be realized through mold processing, but only needs to control the length of the raw material. Therefore, when processing the flat wire conductor, it is only necessary to use the corresponding number of molds according to the number of winding layers, which greatly reduces the number of required molds. For example, in an 8-pole 48-slot motor, there are four layers in the stator slots. The two straight parts are located in the first and second layers of the flat wire conductor respectively, and the distance between the two straight parts is the same, so one set of molds can be used. The two straight parts are located in the third and fourth layers of the flat wire conductor respectively, and the distance between the two straight parts is the same, so another set of molds can be used. Only two sets of molds are needed to complete the conductor processing. Compared with the existing technology, the number of molds used is greatly reduced, which effectively reduces the mold cost and production complexity.

[0041] 5. In the above solution, the neutral point outlet line is connected by a copper ring to avoid the connection method of a jumper.

[0042] 6. In the above scheme, the stator slots of the stator core are rectangular, which, together with the flat wire winding, can effectively increase the stator slot fill rate of the motor and improve the material utilization rate of the stator, thereby reducing the copper loss of the motor and improving the efficiency of the motor.

[0043] 7. In the above solution, a layer of insulating powder is coated on the free end of the flat wire conductor and the copper ring to ensure the insulation performance of the motor.

[0044] 8. In the above scheme, the stator core has a weld groove and a key groove on its outer circle as a process feature of the stator core. The weld groove is used for welding the stator core and the motor housing, and the key groove is used for positioning the stator core on the motor housing.

[0045] The working principle and advantages of the present invention are as follows:

[0046] 1. The axial length of the stator is short, and the welding position and wiring position of the three-phase winding are placed on the same side of the stator, which effectively saves the axial space of the motor, thereby increasing the torque density and power density of the motor.

[0047] 2. The line type is small and the processing is simple. The flat wire conductors in different positions can realize conventional connection, short span connection, neutral point connection and lead-out line connection through the different lengths of the corresponding rear bending parts, without the need to add additional special flat wire conductors for connection.

[0048] 3. The mold cost is low. The flat wire conductors placed in different winding layers have different spacings between the two straight parts. The difference in the length of the bent part does not need to be achieved through mold processing. It can be achieved by controlling the length of the raw materials. Therefore, when processing the flat wire conductor, it is only necessary to use different molds according to the different spacings between the two straight parts of the flat wire conductor, which greatly reduces the number of molds required. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Attached Figure 1 is a three-dimensional diagram of the stator;

[0050] Attached Figure 2 For attachment Figure 1 A partial enlarged view of part A

[0051] Attached Figure 3 Another perspective view of the stator;

[0052] Attached Figure 4 is a radial cross-sectional view of the stator core;

[0053] Attached Figure 5 It is a front view of a flat wire conductor;

[0054] Attached Figure 6 is a three-dimensional radial cross-sectional view of the stator;

[0055] Attached Figure 7 For attachment Figure 6 A partial enlarged view of part B;

[0056] Attached Figure 8 A front view of the first flat wire conductor;

[0057] Attached Fig. 9 A front view of the second flat wire conductor;

[0058] Attached Fig.10 A front view of the third flat wire conductor;

[0059] Attached Fig.11 A front view of a fourth flat wire conductor;

[0060] Attached Fig.12 is a front view of a fourth flat wire conductor of another length;

[0061] Attached Fig.13 It is a partial view of the winding lead part;

[0062] Attached Fig.14 This is an oblique view of the copper ring;

[0063] Attached Fig.15 This is the electrical schematic diagram of a U-phase branch in an 8-pole 48-slot motor;

[0064] Attached Fig.16 This is the electrical schematic diagram of the U phase, V phase and W phase in the 8-pole 48-slot motor;

[0065] Attached Fig.17 The following is the layout diagram of the U-phase one branch and the second branch in the stator slot of the 8-pole 48-slot motor;

[0066] Attached Fig.18 It is a schematic diagram of the arrangement of two flat wire conductors in the stator slots;

[0067] In the above figures: 1. stator; 2. stator core; 3. flat wire conductor; 4. bent end; 5. free end; 6. stator slot; 7. three-phase winding; 8. bent part; 9. straight part; 10. rear bent part; 11. lead end; 12. neutral point end; 13. conventional end; 14. short span end; 15. first flat wire conductor; 16. second flat wire conductor; 17. third flat wire conductor; 18. fourth flat wire conductor; 19. copper ring; 20. welding groove; 21. keyway; 22. welding hole; 23. U-phase one branch lead wire; 24. U-phase one branch neutral point; 25. U-phase two branch lead wire; 26. U-phase two branch neutral point; 27. 1. Lead-out line of one branch of V phase; 2. Neutral point of one branch of V phase; 3. Lead-out line of two branches of V phase; 4. Neutral point of two branches of V phase; 5. Lead-out line of one branch of W phase; 6. Neutral point of one branch of W phase; 7. Lead-out line of two branches of W phase; 8. Neutral point of two branches of W phase; 9. First layer; 10. Second layer; 11. Third layer; 12. Fourth layer. DETAILED DESCRIPTION

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0069] Embodiment: A stator of a flat wire motor

[0070] The present invention will be clearly described below with drawings and detailed descriptions. After understanding the embodiments of the present invention, any person skilled in the art can make changes and modifications based on the techniques taught by the present invention without departing from the spirit and scope of the present invention.

[0071] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0072] The words “include,” “including,” and “have” used in this document are open-ended terms, meaning including but not limited to.

[0073] The terms used in this document generally have the ordinary meaning of each term used in this field, in the context of the case and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the present invention.

[0074] Now the working principle of the present invention is described as follows:

[0075] Reference Figure 1 To Attachment Fig.18 A stator of a flat wire motor, wherein the number of slots per pole and per phase of the motor is 2 and the number of pole pairs is 4. The stator 1 comprises a stator core 2 and a winding, wherein the winding is composed of a plurality of flat wire conductors 3.

[0076] As attached Figure 3 As shown, the stator 1 is defined as having one axial end as a bent end 4 and the other end as a free end 5 .

[0077] As attached Figure 4 and attached Fig.16 As shown, the cross-section of the stator core 2 is annular, and the inner wall of the stator core 2 is evenly provided with 48 axially penetrating stator slots 6 along the circumferential direction, the openings of the stator slots 6 are all facing the axis of the stator core 2, and any stator slot 6 on the stator core 2 is defined as slot No. 1, and the other slots No. 2-48 are arranged in sequence counterclockwise on the circumference of the stator core 2.

[0078] As attached Fig.16 As shown, the winding is a three-phase winding 7 connected in star shape, and the three-phase winding 7 includes a U-phase winding, a V-phase winding and a W-phase winding, wherein each phase winding has two branches connected in parallel.

[0079] As attached Figure 5 As shown, each of the flat wire conductors 3 is formed by bending a flat wire through a mold, and the bending shape of the flat wire conductor 3 is a hairpin shape. Each flat wire conductor 3 consists of a bending portion 8, two straight portions 9 and two rear bending portions 10, wherein the bending portion 8 is formed by bending the flat wire in the middle position to form the angle portion of the hairpin-shaped flat wire conductor 3, and the two rear bending portions 10 are formed by bending the head and tail ends of the flat wire in opposite directions to form the legs on both sides of the opening of the hairpin-shaped flat wire conductor 3. The two straight portions 9 are parallel to each other in the flat wire conductor 3, and the two straight portions 9 are connected to the bending portion 8 at one end and connected to a rear bending portion 10 at the other end to form the straight sections on both sides of the hairpin-shaped flat wire conductor 3.

[0080] As attached Figure 1 and attached Figure 2 As shown, in the installed state, in each of the flat wire conductors 3, the straight portions 9 are arranged in the stator slots 6 along the axial direction of the stator core 2, the bent portions 8 are arranged at the bent ends 4 of the stator 1, and the rear bent portions are arranged at the free ends 5 of the stator 1. When observing the end surface of the free end 5 of the stator 1, in the two rear bent portions 10 of the same flat wire conductor 3, one rear bent portion 10 is bent clockwise toward the end surface with the straight portion 9 connected thereto as a reference, and the other rear bent portion 10 is bent counterclockwise toward the end surface with the straight portion 9 connected thereto as a reference, wherein the clockwise bent rear bent portion 10 is welded to the counterclockwise bent rear bent portion 10 of an adjacent flat wire conductor 3, and the counterclockwise bent rear bent portion 10 is welded to the clockwise bent rear bent portion 10 of another adjacent flat wire conductor 3, and each phase winding is formed in this connection manner, and each phase winding is sequentially arranged in the plurality of stator slots 6 along the circumferential direction of the stator core 2.

[0081] As attached Figure 6 , Attachment Figure 7 and attached Fig.18 As shown, when observing the stator 1 from the perspective of its cross section, the cross section of the straight portion 9 of each flat wire conductor 3 forms a multi-layer structure from the outside to the inside in the stator slot 6 along the radial direction of the stator core 2, and the number of layers is arranged from the outside to the inside in the radial direction of the stator core 2 as the first layer 35, the second layer 36, the third layer 37, and the fourth layer 38, wherein the first layer 35 and the second layer 36 in all the stator slots 6 are defined as the first winding layer, and the third layer 37 and the fourth layer 38 in all the stator slots 6 are defined as the second winding layer.

[0082] As attached Fig.15 , Attachment Fig.16 and attached Fig.17 As shown, in the three-phase winding 7, each phase winding is arranged in the first winding layer along the circumferential direction for two turns, forming the first turn of the first winding layer and the second turn of the first winding layer, and then crosses to the second winding layer and is arranged in the circumferential direction for two turns, forming the first turn of the second winding layer and the second turn of the second winding layer, so that the 48 stator slots 6 of the stator core 2 are arranged cyclically in the first winding layer and the second winding layer, so that a total of 192 layers are filled with the U phase, V phase and W phase of the three-phase winding 7, and the U phase, V phase and W phase each occupy 64 layers, wherein:

[0083] The two straight portions 9 in each flat conductor 3 are located in two different stator slots 6, and the two different stator slots 6 are circumferentially spaced apart by 6 stator slots 6, and the two straight portions 9 are located in different layers of the same winding layer;

[0084] In each winding layer, two adjacent straight portions 9 in two adjacent flat wire conductors 3 in the same turn are located in two different stator slots 6, and the two different stator slots 6 are 6 stator slots 6 apart in the circumferential direction, and the two straight portions 9 are in different layers of the same winding layer;

[0085] In each winding layer, two adjacent straight portions 9 in two adjacent flat wire conductors 3 between the first turn and the second turn are located in two different stator slots 6, and the two different stator slots 6 are circumferentially spaced apart by 5 stator slots 6, and the two straight portions 9 are located in different layers of the same winding layer;

[0086] Two adjacent straight portions 9 in two adjacent flat wire conductors 3 between different winding layers are located in two different stator slots 6 , and the two different stator slots 6 are circumferentially spaced apart by six stator slots 6 , and the two straight portions 9 are in two adjacent layers.

[0087] As attached Figure 8 , Attachment Fig. 9 , Attachment Fig.10 , Attachment Fig.11 and attached Fig.12 As shown, the rear bending part 10 of the flat wire conductor 3 is divided into the following according to different unfolding lengths, from long to short: an outlet end 11, a neutral point end 12, a regular end 13 and a short span end 14. The flat wire conductor 3 thus formed is classified as follows:

[0088] The first flat wire conductor 15 has two rear bent portions 10 that are both regular ends 13;

[0089] The second flat wire conductor 16 has one rear bent portion 10 as a regular end 13 and another rear bent portion 10 as a short span end 14. The unfolded length of the short span end 14 is 5 / 6 of the unfolded length of the regular end 13.

[0090] A third flat wire conductor 17, one rear bent portion 10 of which is a normal end 13, and the other rear bent portion 10 of which is a neutral point end 12;

[0091] A fourth flat wire conductor 18, one rear bent portion 10 of which is a regular end 13, and the other rear bent portion 10 of which is an outlet end 11;

[0092] In the U phase, V phase and W phase, the outlet end 11 of the fourth flat wire conductor 18 of one branch of the two branches of each phase is longer than the outlet end 11 of the fourth flat wire conductor 18 of the other branch;

[0093] The second flat wire conductor 16 corresponds to two adjacent flat wire conductors 3 between the first turn and the second turn in each winding layer, and the straight portions 9 corresponding to the two adjacent short span ends 14 of the two adjacent second flat wire conductors 16 are located in two different stator slots 6, and the two different stator slots 6 are circumferentially spaced apart by 5 stator slots 6, and the two straight portions 9 are located in different layers of the same winding layer;

[0094] The third flat wire conductor 17 is used as the connection at the neutral point in the star-connected structure of the three-phase winding 7, and the neutral point end 12 corresponds to the neutral point of the three-phase winding 7;

[0095] The fourth flat wire conductor 18 is used as the connection at the lead-out line in the star-connected structure of the three-phase winding 7, and the lead-out terminal 11 corresponds to the lead-out line of the three-phase winding 7;

[0096] The first flat-wire conductor 15 acts on the remaining portion of the three-phase winding 7 .

[0097] As attached Fig.15 , Attachment Fig.16 and attached Fig.17 As shown, the specific arrangement is explained by taking the U-phase winding as an example:

[0098] The U-phase branch firstly winds the first turn in the first winding layer, the first flat wire conductor 3 in the first winding layer is the fourth flat wire conductor 18, the straight portion 9 corresponding to the outlet end 11 thereof is located in the first layer 35 of the slot 10, the straight portion 9 corresponding to the regular end 13 thereof is located in the second layer 36 of the slot 16, and the outlet end 11 thereof is the U-phase branch lead wire 23;

[0099] In the first winding layer, the second flat wire conductor 3 is the first flat wire conductor 15, and the straight portion 9 corresponding to one regular end 13 thereof is located in the first layer 35 of slot No. 22, and the straight portion 9 corresponding to the other regular end 13 is located in the second layer 36 of slot No. 28. At this time, the regular end 13 of the first flat wire conductor 3 bent counterclockwise and the regular end 13 of the second flat wire conductor 3 adjacent to the regular end 13 of the first flat wire conductor 3 and bent clockwise are welded and connected at the free end 5, completing the connection between the first flat wire conductor 3 and the second flat wire conductor 3 in the first winding layer of the U-phase branch;

[0100] In the first winding layer, the third flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of the third flat wire conductor 3 is located in the first layer 35 of slot 34, and the straight portion 9 corresponding to the other regular end 13 is located in the second layer 36 of slot 40, and the two adjacent and reversely bent regular ends 13 of the second flat wire conductor 3 and the third flat wire conductor 3 are welded and connected at the free end 5, completing the connection of the second flat wire conductor 3 and the third flat wire conductor 3 in the first winding layer of the U-phase branch;

[0101] In the first winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight portion 9 corresponding to its regular end 13 is located in the first layer 35 of slot No. 46, and the straight portion 9 corresponding to its short span end 14 is located in the second layer 36 of slot No. 4, and the regular end 13 of the fourth flat wire conductor 3 bent clockwise and the regular end 13 of the third flat wire conductor 3 adjacent to the regular end 13 of the fourth flat wire conductor 3 and bent counterclockwise are welded and connected at the free end 5, completing the connection between the third flat wire conductor 3 and the fourth flat wire conductor 3 of the U-phase branch in the first winding layer.

[0102] Then the U-phase branch is wound around the second turn in the first winding layer, the fifth flat wire conductor 3 in the first winding layer is the second flat wire conductor 16, the straight portion 9 corresponding to its short span end 14 is located in the first layer 35 of slot No. 9, and the straight portion 9 corresponding to its regular end 13 is located in the second layer 36 of slot No. 15, the fifth flat wire conductor 3 and the fourth flat wire conductor 3 are two adjacent flat wire conductors 3 between the first turn and the second turn, the short span end 14 of the fifth flat wire conductor 3 and the short span end 14 of the fourth flat wire conductor 3 are welded and connected at the free end 5, completing the connection between the first turn and the second turn of the U-phase branch in the first winding layer;

[0103] In the first winding layer, the sixth flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of which is located in the first layer 35 of slot No. 21, and the straight portion 9 corresponding to the other regular end 13 is located in the second layer 36 of slot No. 27, and two adjacent and reversely bent regular ends 13 of the fifth flat wire conductor 3 and the sixth flat wire conductor 3 are welded and connected at the free end 5, completing the connection of the fifth flat wire conductor 3 and the sixth flat wire conductor 3 in the first winding layer of the U-phase branch;

[0104] In the first winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of the first flat wire conductor 15 is located in the first layer 35 of the slot 33, and the straight portion 9 corresponding to the other regular end 13 is located in the second layer 36 of the slot 39, and the two adjacent and reversely bent regular ends 13 of the sixth flat wire conductor 3 and the seventh flat wire conductor 3 are welded and connected at the free end 5, completing the connection of the sixth flat wire conductor 3 and the seventh flat wire conductor 3 in the first winding layer of the U-phase branch;

[0105] In the first winding layer, the eighth flat wire conductor 3 is the first flat wire conductor 15, and the straight portion 9 corresponding to one of its regular ends 13 is located in the first layer 35 of slot 45, and the straight portion 9 corresponding to the other regular end 13 is located in the second layer 36 of slot 3, and the regular end 13 corresponding to the straight portion 9 in the second layer 36 of slot 3 is the connection end of the U-phase branch in the first winding layer, and the two adjacent and reversely bent regular ends 13 of the seventh flat wire conductor 3 and the eighth flat wire conductor 3 are welded and connected at the free end 5 to complete the connection of the seventh flat wire conductor 3 and the eighth flat wire conductor 3 of the U-phase branch in the first winding layer; at this point, the flat wire conductor 3 of the U-phase branch in the first winding layer is connected.

[0106] Further, the U-phase branch is wound around the first circle in the second winding layer, the first flat wire conductor 3 in the second winding layer is the first flat wire conductor 15, the straight line portion 9 corresponding to one regular end 13 thereof is located in the third layer 37 of slot No. 9, the straight line portion 9 corresponding to the other regular end 13 is located in the fourth layer 38 of slot No. 15, and the regular end 13 corresponding to the straight line portion 9 in the third layer 37 of slot No. 9 is the connection end of the U-phase branch in the second winding layer, the connection end of the U-phase branch in the first winding layer and the connection end of the U-phase branch in the second winding layer are welded and connected at the free end 5, completing the connection between the flat wire conductors 3 of the U-phase branch in the first winding layer and the U-phase branch in the second winding layer;

[0107] In the second winding layer, the second flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of the first flat wire conductor 3 is located in the third layer 37 of the slot No. 21, and the straight portion 9 corresponding to the other regular end 13 is located in the fourth layer 38 of the slot No. 27. The two adjacent and reversely bent regular ends 13 of the first flat wire conductor 3 and the second flat wire conductor 3 are welded and connected at the free end 5, completing the connection between the first flat wire conductor 3 and the second flat wire conductor 3 of the U-phase branch in the second winding layer;

[0108] In the second winding layer, the third flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of the first flat wire conductor 15 is located in the third layer 37 of slot 33, and the straight portion 9 corresponding to the other regular end 13 is located in the fourth layer 38 of slot 39. The two adjacent and oppositely bent regular ends 13 of the second flat wire conductor 3 and the third flat wire conductor 3 are welded and connected at the free end 5, completing the connection between the second flat wire conductor 3 and the third flat wire conductor 3 of the U-phase branch in the second winding layer.

[0109] In the second winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight portion 9 corresponding to its regular end 13 is located in the third layer 37 of slot No. 45, and the straight portion 9 corresponding to its short span end 14 is located in the fourth layer 38 of slot No. 3, and the regular end 13 of the fourth flat wire conductor 3 bent clockwise and the regular end 13 of the third flat wire conductor 3 adjacent to the regular end 13 of the fourth flat wire conductor 3 and bent counterclockwise are welded and connected at the free end 5, completing the connection between the third flat wire conductor 3 and the fourth flat wire conductor 3 of the U-phase branch in the second winding layer.

[0110] Then the U-phase branch is wound around the second turn in the second winding layer. The fifth flat wire conductor 3 in the second winding layer is the second flat wire conductor 16. The straight portion 9 corresponding to its short span end 14 is located in the third layer 37 of slot No. 8, and the straight portion 9 corresponding to its regular end 13 is located in the fourth layer 38 of slot No. 14. The fifth flat wire conductor 3 and the fourth flat wire conductor 3 are two adjacent flat wire conductors 3 between the first turn and the second turn. The short span end 14 of the fifth flat wire conductor 3 and the short span end 14 of the fourth flat wire conductor 3 are welded and connected at the free end 5, completing the connection between the first turn and the second turn of the U-phase branch in the second winding layer.

[0111] In the second winding layer, the sixth flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of the sixth flat wire conductor 3 is located in the third layer 37 of the slot No. 20, and the straight portion 9 corresponding to the other regular end 13 is located in the fourth layer 38 of the slot No. 26. The regular end 13 of the fifth flat wire conductor 3 bent counterclockwise and the regular end 13 of the sixth flat wire conductor 3 adjacent to the regular end 13 of the fifth flat wire conductor 3 and bent clockwise are welded and connected at the free end 5, completing the connection of the fifth flat wire conductor 3 and the sixth flat wire conductor 3 in the second winding layer of the U-phase branch.

[0112] In the second winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15, the straight portion 9 corresponding to one regular end 13 of which is located in the third layer 37 of slot No. 32, and the straight portion 9 corresponding to the other regular end 13 of which is located in the fourth layer 38 of slot No. 38, and the two adjacent and reversely bent regular ends 13 of the sixth flat wire conductor 3 and the seventh flat wire conductor 3 are welded and connected at the free end 5, completing the connection of the sixth flat wire conductor 3 and the seventh flat wire conductor 3 of the U-phase branch in the second winding layer;

[0113] In the second winding layer, the eighth flat wire conductor 3 is the third flat wire conductor 17, and the straight portion 9 corresponding to its regular end 13 is located in the third layer 37 of slot No. 44, and the straight portion 9 corresponding to its neutral point end 12 is located in the fourth layer 38 of slot No. 2, and the neutral point end 12 is the neutral point 24 of the U-phase branch. The regular end 13 of the eighth flat wire conductor 3 bent clockwise and the regular end 13 of the seventh flat wire conductor 3 adjacent to the regular end 13 of the eighth flat wire conductor 3 and bent counterclockwise are welded and connected at the free end 5, completing the connection between the seventh flat wire conductor 3 and the eighth flat wire conductor 3 of the U-phase branch in the second winding layer; at this point, the flat wire conductor 3 of the U-phase branch in the second winding layer is connected.

[0114] Referring to the arrangement of one branch of the U phase, the two branches of the U phase are first wound with the first turn and the second turn in the second winding layer, and then wound with the first turn and the second turn in the first winding layer;

[0115] First, the first flat wire conductor 3 of the U-phase two-branch in the second winding layer is the fourth flat wire conductor 18, the straight portion 9 corresponding to its outlet end 11 is located in the fourth layer 38 of the slot 44, the straight portion 9 corresponding to the regular end 13 is located in the third layer 37 of the slot 38, and its outlet end 11 is the U-phase two-branch lead wire 25;

[0116] Then, the arrangement of the U-phase two branches is opposite to that of the U-phase one branch, and the connection method is the same as that of the U-phase one branch, wherein the specific position of each flat wire conductor 3 is:

[0117] The second branch of the U phase is in the first turn of the second winding layer: the second flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot No. 32 and the third layer 37 of the slot No. 26; the third flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot No. 20 and the third layer 37 of the slot No. 14; the fourth flat wire conductor 3 is the second flat wire conductor 16, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot No. 8 and the third layer 37 of the slot No. 2;

[0118] The second branch of the U phase is in the second turn of the second winding layer: the fifth flat wire conductor 3 is the second flat wire conductor 16, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot 45 and the third layer 37 of the slot 39; the sixth flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot 33 and the third layer 37 of the slot 27; the seventh flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot 21 and the third layer 37 of the slot 15; the eighth flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the fourth layer 38 of the slot 9 and the third layer 37 of the slot 3;

[0119] The second branch of the U phase is in the first turn of the first winding layer: the first flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight portions 9 are respectively located in the second layer 36 of slot No. 45 and the first layer 35 of slot No. 39; the second flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight portions 9 are respectively located in the second layer 36 of slot No. 33 and the first layer 35 of slot No. 27; the third flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight portions 9 are respectively located in the second layer 36 of slot No. 21 and the first layer 35 of slot No. 15; the fourth flat wire conductor 3 is the second flat wire conductor 16, and the corresponding two straight portions 9 are respectively located in the second layer 36 of slot No. 9 and the first layer 35 of slot No. 3;

[0120] The second branch of the U phase is in the second turn of the first winding layer: the fifth flat wire conductor 3 is the second flat wire conductor 16, and the corresponding two straight line portions 9 are respectively located in the second layer 36 of the slot 46 and the first layer 35 of the slot 40; the sixth flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the second layer 36 of the slot 34 and the first layer 35 of the slot 28; the seventh flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line portions 9 are respectively located in the second layer 36 of the slot 22 and the first layer 35 of the slot 16;

[0121] Finally, the eighth flat wire conductor 3 in the second turn of the first winding layer of the U-phase two branch is the third flat wire conductor 17, and the straight line portion 9 corresponding to its conventional end 13 is located in the second layer 36 of slot No. 10, and the straight line portion 9 corresponding to its neutral point end 12 is located in the first layer 35 of slot No. 4, and the neutral point end 12 is the neutral point 26 of the U-phase two branch.

[0122] As attached Fig.16 As shown, the V-phase winding and the W-phase winding are arranged according to the arrangement of the U-phase winding, wherein: the V-phase branch lead wire 27 is located in the first layer 35 of slot No. 14, the V-phase branch neutral point 28 is located in the fourth layer 38 of slot No. 6, the V-phase two-branch lead wire 29 is located in the fourth layer 38 of slot No. 48, the V-phase two-branch neutral point 30 is located in the first layer 35 of slot No. 8, the W-phase branch lead wire 31 is located in the first layer 35 of slot No. 18, the W-phase branch neutral point 32 is located in the fourth layer 38 of slot No. 10, the W-phase two-branch lead wire 33 is located in the fourth layer 38 of slot No. 4, and the W-phase two-branch neutral point 34 is located in the first layer 35 of slot No. 12.

[0123] The three-phase winding 7 arranged in this way has different distances between the two straight parts 9 of the flat wire conductor 3 in different winding layers. The distance between the two straight parts 9 of the flat wire conductor 3 in the first winding layer is greater than the distance between the two straight parts 9 of the flat wire conductor 3 in the second winding layer.

[0124] As attached Figure 1 , Attachment Figure 2 and attached Fig.13 As shown, in the three-phase winding 7, a U-phase branch lead 23 and a U-phase second branch lead 25 are welded and connected at the free end 5, a V-phase branch lead 27 and a V-phase second branch lead 29 are welded and connected at the free end 5, a W-phase branch lead 31 and a W-phase second branch lead 33 are welded and connected at the free end 5, and a U-phase branch neutral point 24, a U-phase second branch neutral point 26, a V-phase branch neutral point 28, a V-phase second branch neutral point 30, a W-phase branch neutral point 32 and a W-phase second branch neutral point 34 are connected at the free end 5 via a copper ring 19.

[0125] As attached Fig.14 As shown, the copper ring 19 is an arc-shaped flat sheet, and six welding holes 22 are provided on the copper ring. All the neutral point ends 12 are welded in the welding holes 22.

[0126] Preferably, as attached Figure 6 and attached Figure 7 As shown, the stator slots 6 of the stator core 2 are rectangular.

[0127] Preferably, as attached Figure 1 and attached Figure 3 As shown, the stator core 2 is provided with a welding groove 20 and a key groove 21 on its outer circumference.

[0128] Preferably, a layer of insulating powder is coated on the portion of the flat wire conductor 3 located at the free end 5 and on the copper ring 19 .

[0129] The following is an explanation of other implementations and structural changes of the present invention:

[0130] 1. In the above embodiments, the U-phase two branches are arranged from the second winding layer, and can also be arranged from the first winding layer, that is, from the neutral point 26 of the U-phase two branches to the U-phase two branches lead-out line 25. Other final arrangement results and the same arrangement order as the embodiment should be included in the present invention, which can be understood and accepted by those skilled in the art.

[0131] 2. In the above embodiment, the three-phase winding 7 includes a U-phase winding, a V-phase winding and a W-phase winding, wherein each phase winding is connected in parallel with two branches, and each phase winding can also be connected in a single circuit, that is, the original U-phase branch neutral point 24 is connected to the original U-phase two-branch lead-out line 25, the original U-phase branch lead-out line 23 is used as the new U-phase lead-out line, the original U-phase two-branch neutral point 26 is used as the new U-phase neutral point, the original V-phase branch neutral point 28 is connected to the original V-phase two-branch lead-out line 29, and the original V-phase branch lead-out line 27 is used as the new The V-phase lead wire, the original V-phase two-branch neutral point 30 serves as the new V-phase neutral point, the original W-phase one-branch neutral point 32 is connected to the original W-phase two-branch lead wire 33, the original W-phase one-branch lead wire 31 serves as the new W-phase lead wire, and the original W-phase two-branch neutral point 34 serves as the new W-phase neutral point. As long as the arrangement method of this embodiment is used in the three-phase flat wire stator of the 8-pole 48-slot motor, the arrangement structure of each phase winding having 32 flat wire conductors 3 should be included in the present invention, which can be understood and accepted by those skilled in the art.

[0132] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention. The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stator of a flat wire motor, wherein the number of slots per pole per phase of the motor is 2, the number of pole pairs is p, the stator (1) comprises a stator core (2) and a winding, the winding is composed of a plurality of flat wire conductors (3), wherein: The stator (1) has a bent end (4) at one axial end and a free end (5) at the other end; The cross section of the stator core (2) is annular, and the inner wall of the stator core (2) is evenly provided with z axially penetrating stator slots (6) in the circumferential direction, the openings of the stator slots (6) all face the axis of the stator core (2), and z=12p is satisfied; The winding is a star-connected three-phase winding (7), and the three-phase winding (7) comprises a U-phase winding, a V-phase winding and a W-phase winding; Each flat wire conductor (3) is formed by bending a flat wire through a die, and the bending shape of the flat wire conductor (3) is a hairpin shape. Each flat wire conductor (3) is composed of a bending portion (8), two straight portions (9) and two rear bending portions (10), wherein the bending portion (8) is formed by bending the flat wire at the middle position to form the angle portion of the hairpin-shaped flat wire conductor (3), and the two rear bending portions (10) are formed by bending the head and tail ends of the flat wire in opposite directions to form the legs on both sides of the opening of the hairpin-shaped flat wire conductor (3). The two straight portions (9) are parallel to each other in the flat wire conductor (3), and one end of each of the two straight portions (9) is connected to the bending portion (8) and the other end is connected to a rear bending portion (10), forming the straight sections on both sides of the hairpin-shaped flat wire conductor (3); In the installed state, in each of the flat wire conductors (3), the straight portion (9) is arranged in the stator slot (6) along the axial direction of the stator core (2), the bent portion (8) is arranged at the bent end (4) of the stator (1), and the rear bent portion is arranged at the free end (5) of the stator (1). When observing the end face of the free end (5) of the stator (1), in the two rear bent portions (10) of the same flat wire conductor (3), one rear bent portion (10) is bent clockwise toward the end face with the straight portion (9) connected thereto as a reference, and the other rear bent portion (10) is bent clockwise toward the end face. The portion (10) is bent counterclockwise toward the end surface with the straight portion (9) connected thereto as a reference, wherein the clockwise bent rear-bend portion (10) is welded to the counterclockwise bent rear-bend portion (10) of an adjacent flat wire conductor (3), and the counterclockwise bent rear-bend portion (10) is welded to the clockwise bent rear-bend portion (10) of another adjacent flat wire conductor (3), and each phase winding is formed in this connection manner, and each phase winding is sequentially arranged around and penetrates the plurality of stator slots (6) along the circumferential direction of the stator core (2); Features: When the stator (1) is observed from the perspective of its cross section, the cross section of the straight portion (9) of each flat wire conductor (3) forms a multi-layer structure from outside to inside in the stator slot (6) along the radial direction of the stator core (2), and the number of layers is arranged from outside to inside in the radial direction of the stator core (2) as a first layer (35), a second layer (36), a third layer (37), a fourth layer (38) to a 4nth layer, where n is a positive integer, wherein the first layer (35) and the second layer (36) in all the stator slots (6) are defined as a first winding layer, the third layer (37) and the fourth layer (38) in all the stator slots (6) are defined as a second winding layer, and so on; In the three-phase winding (7), each phase winding is arranged in a first winding layer along a circumferential direction for two turns, forming a first turn of the first winding layer and a second turn of the first winding layer, and then crosses to the second winding layer and is arranged in a circumferential direction for two turns, forming a first turn of the second winding layer and a second turn of the second winding layer, and is arranged in a cycle in each winding layer until each layer of each stator slot (6) of the stator core (2) is filled with the three-phase winding (7), wherein: The two straight portions (9) in each flat wire conductor (3) are located in two different stator slots (6), and the two different stator slots (6) are spaced apart by z / 2p stator slots (6) in the circumferential direction, and the two straight portions (9) are located in different layers of the same winding layer; In each winding layer, two adjacent straight portions (9) in two adjacent flat wire conductors (3) in the same turn are located in two different stator slots (6), and the two different stator slots (6) are separated by z / 2p stator slots (6) in the circumferential direction, and the two straight portions (9) are located in different layers of the same winding layer; In each winding layer, two adjacent straight portions (9) in two adjacent flat wire conductors (3) between a first turn and a second turn are located in two different stator slots (6), and the two different stator slots (6) are spaced apart by z / 2p-1 stator slots (6) in the circumferential direction, and the two straight portions (9) are located in different layers of the same winding layer; Two adjacent straight line portions (9) in two adjacent flat wire conductors (3) between different winding layers are located in two different stator slots (6), and the two different stator slots (6) are spaced apart by z / 2p stator slots (6) in the circumferential direction, and the two straight line portions (9) are in adjacent layers.

2. The stator according to claim 1, characterized in that: The rear-bend portion (10) of the flat-wire conductor (3) has different unfolded lengths, and is, from long to short, comprised of: an outlet end (11), a neutral point end (12), a conventional end (13), and a short span end (14). The flat-wire conductor (3) thus formed is classified as follows: A first flat wire conductor (15), wherein both rear bent portions (10) are conventional ends (13); A second flat wire conductor (16), one rear bent portion (10) of which is a conventional end (13) and the other rear bent portion (10) of which is a short span end (14); A third flat wire conductor (17), one rear bent portion (10) of which is a normal end (13) and the other rear bent portion (10) of which is a neutral point end (12); A fourth flat wire conductor (18), one rear bent portion (10) of which is a conventional end (13), and the other rear bent portion (10) of which is an outlet end (11); The second flat wire conductor (16) corresponds to two adjacent flat wire conductors (3) between the first turn and the second turn in each winding layer, the straight line portions (9) corresponding to the two adjacent short span ends (14) of the two adjacent second flat wire conductors (16) are located in two different stator slots (6), and the two different stator slots (6) are spaced apart by z / 2p-1 stator slots (6) in the circumferential direction, and the two straight line portions (9) are located in different layers of the same winding layer; The third flat wire conductor (17) is used as a connection at the neutral point in the star-connected structure of the three-phase winding (7), and the neutral point end (12) corresponds to the neutral point of the three-phase winding (7); The fourth flat wire conductor (18) is used as a connection for the lead-out line in the star-connected structure of the three-phase winding (7), and the lead-out line end (11) corresponds to the lead-out line of the three-phase winding (7); The first flat wire conductor (15) acts on the remaining parts of the three-phase winding (7).

3. The stator according to claim 2, characterized in that: In the three-phase winding (7), the outlet end (11) of the fourth flat wire conductor (18) of each phase is welded and connected to the free end (5), and the neutral point end (12) of the third flat wire conductor (17) of each phase is connected to the free end (5) via a copper ring (19).

4. The stator according to claim 3, characterized in that: The copper ring (19) is an arc-shaped flat sheet, and a welding hole (22) is provided on the copper ring. All the neutral point ends (12) are welded in the welding hole (22).

5. The stator according to claim 1, characterized in that: The distance between the two straight portions (9) of the flat wire conductor (3) in different winding layers of the three-phase winding (7) is different. The distance between the two straight portions of the flat wire conductor (3) in the first winding layer is greater than the distance between the two straight portions (9) of the flat wire conductor (3) in the second winding layer, and so on.

6. The stator according to claim 1, characterized in that: The stator slots (6) of the stator core (2) are rectangular.

7. The stator according to claim 1, characterized in that: The stator core (2) is provided with a welding groove (20) and a key groove (21) on its outer circumference.

8. The stator according to claim 3, characterized in that: A layer of insulating powder is coated on the portion of the flat wire conductor (3) located at the free end (5) and on the copper ring (19).

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