CN111342576A - Stator of a new type of flat wire motor - Google Patents

Abstract

A stator of a novel flat wire motor comprises a stator core and a winding, wherein the winding consists of a plurality of flat wire conductors, a plurality of axially through stator slots are uniformly arranged on the inner wall of the stator core along the circumferential direction, the winding is a three-phase winding in star connection, each phase of winding is wound in the stator core to form each winding layer, each winding is wound in each winding layer for two circles, and the windings are arranged in a staggered manner between a first circle and a second circle, thereby improving the efficiency of the motor, reducing the current loss, having different lengths of raw materials used by the flat wire conductors at different connecting positions, different wiring is realized through the extra length that increases or reduces, other line types do not need to additionally increase, and the welding position of flat wire conductor and the wiring position of each phase winding are put in stator same side, can effectively save the axial space of motor to increase the torque density and the power density of motor.

Description

Stator of a new type of flat wire motor

technical field

The invention relates to a motor stator, in particular to a motor stator whose windings are flat wire windings.

Background technique

With the development of new energy vehicles and the growing maturity of the market, as the main power source of new energy vehicles, especially the only power source of pure electric vehicles, the requirements for torque density, power density and efficiency are getting higher and higher. In order 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 is becoming more and more prominent.

For permanent magnet synchronous motors, especially for automotive permanent magnet synchronous motors, placing flat wire windings or rectangular conductors in the stator slots can effectively improve the full rate of the motor stator slots, improve the material utilization rate of the stator, and reduce the copper consumption of the motor. consumption to improve the efficiency of the motor. At the same time, the height of the end of the motor winding coil can be effectively reduced, thereby saving the volume of the motor. However, compared with the traditional round wire winding, the coil winding of the flat wire winding still has many difficulties in offline, and it is difficult to use machinery to automatically complete the winding offline process.

For this reason, the prior art has made many improvements to the flat wire winding, but there are still deficiencies: a flat wire stator is proposed in the patent document CN200780022091.7, but the motor flat wire has many linear shapes, and the windings of different phases The wiring between them requires additional conductors, which will further increase the mold cost and process cost; the patent document CN201710878010.9 proposes a flat wire stator, which is optimized for the linear shape of the flat wire The lead wire is more complicated, and the motor stator still needs to increase the height of the welding point on the welding side and the height of the outlet wire on the bending side; the patent document CN201910367345.3 proposes a flat wire stator, which bends a group of flat wire conductors together on one side After folding, bend and weld separately on the other side, which avoids increasing the height of the solder joint on the welding side and the height of the lead wire and outlet wire on the bent side, but since the flat wire conductors are bent together on one side, the motor flat wire is caused. The stretchability of the conductor and the adhesion of the paint film face great challenges.

In view of the above problems, the present invention proposes a stator for a new type of flat wire motor, which improves the motor efficiency by designing a new type of winding method, and at the same time solves the problem of increasing the height of the welding point of the flat wire stator and the difference between the lead wire and the outlet wire on the bent side, respectively. The problem of height is controlled, and the number of lines of the flat wire conductor is controlled, and the number of the flat wire conductor forming dies is reduced, thereby reducing the overall production difficulty and cost of the motor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a stator of a novel flat wire motor.

To achieve the above object, the technical scheme adopted in the present invention is:

A stator of a new type of flat wire motor, the number of slots per pole and phase of the motor is defined as 2, and the number of pole pairs is p, the stator includes a stator iron core and a winding, and the winding is composed of a plurality of flat wire conductors, wherein:

One end of the stator in the axial direction is a bent end, and the other end is a free end;

The section of the stator iron core is annular, and the inner wall of the stator iron core is evenly provided with z axial through stator slots along the circumferential direction, and z=12p is satisfied;

The winding is a star-connected three-phase winding, and the three-phase winding includes a U-phase winding, a V-phase winding and a W-phase winding;

Each of the flat wire conductors is formed by bending a flat wire through a mold, the bending shape of the flat wire conductor is a hairpin, and each flat wire conductor consists of a bending part, two straight parts and two back bending parts It consists of a bending part, wherein the bending part is formed by bending the flat wire at the middle position to form the angle part of the hairpin-shaped flat wire conductor, and the two rear bending parts are formed by bending the head and tail ends of the flat wire in opposite directions. The legs are extended on both sides of the opening of the hairpin-shaped flat wire conductor. The two straight line parts are parallel to each other in the flat wire conductor. One end of the two straight line parts is connected to the bending part, and the other end is connected to a back bending part to form a hairpin-shaped flat wire. Straight sections on both sides of the wire conductor;

In the installed state, in each of the flat wire conductors, the straight part is arranged in the stator slot along the axial direction of the stator core, the bent part is arranged on the bent end of the stator, and the rear bent part is arranged on the stator The free end of the stator is viewed towards the end face of the free end of the stator. Among the two back-bending parts of the same flat wire conductor, one back-bending part is bent clockwise towards the end face based on the straight line part it connects, and the other back-bending part It is bent counterclockwise toward the end face based on the connected straight line portion, wherein the back bent portion bent clockwise is welded and connected with the back bent portion bent counterclockwise of an adjacent flat conductor, and the back bent portion bent counterclockwise is connected by welding. Part of it is welded and connected to the back bending part of another adjacent flat wire conductor that is bent clockwise, so as to form each phase winding in this connection mode, and each phase winding is wound around the plurality of said stator cores in turn along the circumferential direction of the stator core. in the stator slot;

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

Among the three-phase windings, the windings of each phase are arranged in two turns in the circumferential direction in the first winding layer to form the first turn of the first winding layer and the second turn of the first winding layer, and then span to the second winding layer. Arrange two turns in the circumferential direction to form the first turn of the second winding layer and the second turn of the second winding layer, so as to circulate in each winding layer until each layer of each stator slot of the stator core is covered by three-phase windings until full, of which:

The two straight sections 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 sections are in different parts of the same winding layer. layer;

In each winding layer, two adjacent straight line parts 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 stators in the circumferential direction slot, while the two straight sections are in different layers of the same winding layer;

In each winding layer, two adjacent straight portions of two adjacent flat wire conductors located between the first turn and the second turn are located in two different stator slots, and the two different stator slots are in the circumferential direction are z/2p-1 stator slots apart, and the two straight sections are in different layers of the same winding layer;

Adjacent two 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 circumferentially separated by z/2p stator slots, while The two straight sections are in adjacent layers.

Preferably, the back bending parts of the flat wire conductors are different in length, from long to short: the outlet end, the neutral point end, the regular end and the short span end. The flat wire conductors formed by this are classified as: :

The first flat wire conductor, the two back-bending parts of which are both conventional ends;

For the second flat wire conductor, one back-bending part is a regular end, and the other back-bending part is a short-span end;

For the third flat wire conductor, one of the back-bending parts is the normal end, and the other back-bending part is the neutral point end;

For the fourth flat wire conductor, one rear bending part is the conventional end, and the other rear bending part is the outlet end;

The second flat wire conductors correspond to two adjacent flat wire conductors between the first turn and the second turn in each winding layer, and the two adjacent short span ends of the two adjacent second flat wire conductors correspond to The straight parts of the s 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 parts are in different layers of the same winding layer;

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

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

The first flat wire conductor acts on the rest of the three-phase winding.

Preferably, the distance between the two straight lines of the flat wire conductors of the three-phase windings on different turns is different. Since the three-phase windings are wound in the stator core from the outside to the inside along the radial direction, the number of turns increases as the number of turns increases. At the same time, its circumferential dimension is also shortening, so the spacing between the two straight parts of the flat wire conductor of the first round is larger than the spacing of the two straight parts of the flat wire conductor of the second round, and the spacing of the two straight parts of the flat wire conductor of the second round is greater than that of the second round. The spacing between the two straight parts of the three-round flat wire conductor, and by analogy, each round is provided with a first flat wire conductor, a second flat wire conductor, a third flat wire conductor and a fourth flat wire conductor.

Preferably, in the three-phase winding, the outgoing ends of the fourth flat wire conductors of each phase are connected by welding at the free ends, and the neutral point ends of the third flat wire conductors of each phase pass through a copper wire at the free ends. ring to connect.

Preferably, the copper ring is an arc-shaped flat sheet, the copper ring is provided with welding holes, and all the neutral point ends are welded in the welding holes.

Preferably, the distance between the two straight portions of the flat wire conductors in different winding layers of the three-phase winding is different, and the distance between the two straight portions of the flat wire conductors in the first winding layer is greater than the two straight portions of the flat wire conductors in the second winding layer. distance, and so on.

Preferably, the stator slots of the stator core are rectangular.

Preferably, the outer circumference of the stator core is provided with a weld slot and a key slot.

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

The relevant contents in the above technical solutions are explained as follows:

1. In the above solution, in each of the winding layers, the number of stator slots that are located between the first and second circles between the first circle and the second circle is greater than the distance between the two adjacent straight line parts of the same circle. The two adjacent straight line parts of the two adjacent flat wire conductors are one more, so that the flat wire conductors of each three-phase winding are dislocated. This way of arranging the windings can improve the efficiency of the motor, reduce copper consumption and AC resistance losses.

2. In the above solution, the flat wire conductors are classified into the first flat wire conductor, the second flat wire conductor, the third flat wire conductor and the fourth flat wire conductor according to the different unfolding lengths of the back bending parts, and the adjacent flat wire conductors are The wire conductors are welded and connected by adjacent back-bending parts, and each phase winding is formed in this connection mode, and depending on the different lengths of the back-bending parts of different types of flat wire conductors, conventional connection, short-span connection, neutral Point connection and lead wire connection do not require additional flat wire conductors dedicated to connection, and the line type is small and simple to process.

3. In the above-mentioned solution, due to the use of the winding method of staggered arrangement and various types of flat wire conductors with different lengths of the back bending part in the present invention, the free end of the stator can be used as the welding connection side of each flat wire conductor, and also It can be used as the connection side of each fourth flat wire conductor outlet end and each third flat wire conductor neutral point end, and the welding position and the wiring position are placed on the same side, so that the bent end can have a shorter end height, free The terminals simultaneously undertake the functions of welding and wiring, and this 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.

4. In the above solution, when the two adjacent stator slots in the stator core are closer to the axis of the stator core, the distance between the two stator slots is closer, because the straight part of each flat wire conductor is in the stator slot from outside to inside. A multi-layer structure is formed, so 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 parts of the flat wire conductor are separated by the same number of stator slots, the distance between the two straight parts still varies with the layer. The number increases and shortens, and the invention realizes the connection of different functions by relying on the different lengths of the back bending parts of the different types of flat wire conductors. The length of the back bending part is different, and the obtained flat wire conductor has only one difference except for the length of the back bending part, that is, the distance between the two straight parts of the flat wire conductor due to being placed in different winding layers The difference in the length of the back bending part does not need to be realized by mold processing, but only by controlling the length of the raw material. Therefore, when processing the flat wire conductor, only the corresponding number of molds need to be used according to the number of winding layers, which greatly reduces the number of molds required. , For example, in an 8-pole 48-slot motor, the number of layers in the stator slot is four, and the two straight parts are located on the first layer and the second layer of the flat wire conductor respectively. The distance between the two straight parts is the same, and a set of molds can be used. , the two straight parts are located on the third and fourth layers of flat wire conductors, respectively, and the distance between the two straight parts is the same, and another set of molds can be used, and only two sets of molds are needed to complete the conductor processing. Compared with the prior art, The number of molds used is greatly reduced, which effectively reduces the cost of molds and the complexity of production.

5. In the above solution, the neutral point outgoing line is connected by a copper ring to avoid the connection method of jumper wires.

6. In the above solution, the stator slot of the stator iron core is rectangular, and the flat wire winding can effectively improve the full rate of the stator slot of the motor and improve the material utilization rate of the stator, thereby reducing the copper consumption of the motor and improving the efficiency of the motor.

7. In the above solution, the part of the flat wire conductor located at the free end and the copper ring are coated with a layer of insulating powder to ensure the insulation performance of the motor.

8. In the above scheme, the stator iron core has a welding seam slot and a key slot on its outer circle as the technological feature of the stator iron core. The welding seam slot is used for the welding connection of the stator iron core and the motor shell, and the key slot is used for the stator. The positioning of the iron core on the motor housing.

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

1. The axial length of the stator is short, and the welding position and wiring position of the three-phase windings 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.

2. Less line type and simple processing. The flat wire conductors in different positions can realize conventional connection, short span connection, neutral point connection and lead wire connection through the different lengths of the corresponding back-bending parts, and there is no need to add special connection Flat wire conductor.

3. The cost of the mold is low. The flat wire conductors placed in different winding layers have different distances between the two straight parts, and the difference in the length of the back bending part does not need to be realized by mold processing, but only needs to control the length of the raw material. For wire conductors, it is only necessary to use different molds according to the different distances between the two straight parts of the flat conductor, which greatly reduces the number of molds required.

Description of drawings

Accompanying drawing 1 is stator perspective view;

Fig. 2 is a partial enlarged view of part A of Fig. 1

3 is a perspective view of the stator from another perspective;

Accompanying drawing 4 is the radial sectional view of stator core;

Accompanying drawing 5 is the front view of flat wire conductor;

Accompanying drawing 6 is the three-dimensional radial sectional view of stator;

Accompanying drawing 7 is the partial enlarged view of B part of accompanying drawing 5;

Accompanying drawing 8 is the front view of the first flat wire conductor;

Accompanying drawing 9 is the front view of the second flat wire conductor;

Accompanying drawing 10 is the front view of the third flat wire conductor;

Accompanying drawing 11 is the front view of the fourth flat wire conductor;

12 is a front view of a fourth flat wire conductor of another length;

Figure 13 is a partial view of the winding lead portion;

Accompanying drawing 14 is copper ring oblique view;

Accompanying drawing 15 is the electrical schematic diagram of U-phase branch circuit in 8-pole 48-slot motor;

Accompanying drawing 16 is the electrical schematic diagram of U-phase, V-phase and W-phase in 8-pole 48-slot motor;

17 is the layout diagram of the U-phase branch and the two branches in the stator slot in the 8-pole 48-slot motor;

18 is a schematic diagram of the arrangement of two flat wire conductors in the stator slot;

In the above drawings: 1. Stator; 2. 2. Stator iron core; 3. Flat wire conductor; 4. Bending end; 5. Free end; 7. Stator slot; 7. Three-phase winding; Bending part; 9. 10. Straight line part; Back bending part; 11. 12. Outlet terminal; 13. Neutral point end; 14. Regular end; 14. Short span end; 15. The first flat wire conductor; 17. The second flat wire conductor; 18. The third flat wire conductor; 18. The fourth flat wire conductor; 20. Copper ring; Weld groove; 21. keyway; 22. Welding holes; 23. 24. U-phase branch lead wire; 25. The neutral point of the U-phase branch; 26. U-phase two branch leads; 26. 27. The neutral point of the U-phase two branches; 28. V-phase branch lead-out line; 29. The neutral point of the V-phase branch; 30. V-phase two branch leads; 31. The neutral point of the V-phase two branches; 32. W-phase branch lead wire; 32. The neutral point of the W-phase branch; 34. W-phase two branch leads; 35. The neutral point of the second branch of the W phase; The first layer; 36. The second floor; 37. The third floor; 38. Fourth floor.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the present invention is further described:

Example: Stator of a Novel Flat Wire Motor

The present case will be clearly described below with drawings and detailed descriptions. After understanding the embodiments of this case, any person skilled in the art can make changes and modifications by the techniques taught in this case, which does not deviate from the spirit and scope of this case.

As used herein, "connecting" or "positioning" may refer to two or more components or devices in direct physical contact with each other, or in indirect physical contact with each other, and may also refer to two or more components or devices interacting with each other or action.

As used herein, "comprising", "including", "having" and the like are open-ended terms, meaning including but not limited to.

Regarding the terms (terms) used in this article, unless otherwise specified, they usually have the ordinary meaning of each term used in this field, in the content of this case and in the special content. Certain terms used to describe the present case are discussed below or elsewhere in this specification to provide those skilled in the art with additional guidance regarding the description of the present case.

The working principle of the present invention is described as follows:

Referring to Figures 1 to 18, a stator of a new type of flat wire motor, the number of slots per pole and phase of the motor is 2, the number of pole pairs is 4, the stator 1 includes a stator core 2 and a winding, the winding is composed of It is composed of a plurality of flat wire conductors 3 .

As shown in FIG. 3 , one end of the stator 1 in the axial direction is defined as a bent end 4 , and the other end is defined as a free end 5 .

As shown in FIG. 4 and FIG. 16 , the cross-section of the stator core 2 is annular, and the inner wall of the stator core 2 has 48 axially penetrating stator slots 6 in the circumferential direction, and the openings of the stator slots 6 are all uniform. Facing the axis of the stator iron core 2 , any stator slot 6 on the stator iron core 2 is defined as the No. 1 slot, and the other No. 2-48 slots are arranged counterclockwise on the circumference of the stator iron core 2 in turn.

As shown in FIG. 16 , the winding is a three-phase winding 7 connected in a 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 is two branches connected in parallel.

As shown in FIG. 5 , each of the flat wire conductors 3 is formed by bending a flat wire through a die. The bending shape of the flat wire conductors 3 is a hairpin shape, and each flat wire conductor 3 is formed by a bending part. 8. Two straight parts 9 and two back bending parts 10 are formed, wherein, the bending part 8 is formed by bending the flat wire at the middle position to form the angle part of the hairpin-shaped flat wire conductor 3, and the two back bending parts are formed. The part 10 is 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 parts 9 are parallel to each other in the flat wire conductor 3, and the two straight parts 9 One end is connected to the bending part 8 , and the other end is connected to a rear bending part 10 , forming straight sections on both sides of the hairpin-shaped flat wire conductor 3 .

As shown in FIG. 1 and FIG. 2 , in the installed state, among the flat wire conductors 3 , the straight part 9 is arranged in the stator slot 6 along the axial direction of the stator core 2 , and the bent part 8 is all arranged in the stator slot 6 . It is arranged at the bent end 4 of the stator 1, and the rear bent parts are arranged at the free end 5 of the stator 1. Viewed from the end face of the free end 5 of the stator 1, in the two rear bent parts 10 of the same flat conductor 3, One back bent portion 10 is bent clockwise toward the end face with its connected straight portion 9 as a reference, and the other back bent portion 10 is bent counterclockwise toward the end face with its connected straight portion 9 as a reference. The bent portion 10 is welded and connected to the back bent portion 10 bent counterclockwise of one adjacent flat wire conductor 3, and the back bent portion 10 bent counterclockwise is connected to the back bent portion 10 bent clockwise of another adjacent flat wire conductor 3. The bent parts 10 are connected by welding, and each phase winding is formed in this connection manner.

As shown in FIG. 6 , FIG. 7 and FIG. 18 , when the stator 1 is viewed from its cross-section, the cross-section of the straight portion 9 of each flat wire conductor 3 is in the stator slot 6 along the radial direction of the stator core 2 . A multi-layer structure is formed from outside to inside, and the number of layers is ordered from outside to 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 all the stator slots The first layer 35 and the second layer 36 in 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.

As shown in FIG. 15 , FIG. 16 and FIG. 17 , in the three-phase winding 7 , each phase winding is arranged in two turns in the circumferential direction in the first winding layer to form the first and second turns of the first winding layer. The second circle of the first winding layer, and then cross into the second winding layer and arrange two circles in the circumferential direction to form the first circle of the second winding layer and the second circle of the second winding layer. The cyclic arrangement in the second winding layer makes the 48 stator slots 6 of the stator core 2 a total of 192 layers 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 are respectively It occupies 64 layers, of which:

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 separated by six stator slots 6 in the circumferential direction, and the two straight portions 9 are in the same in different layers of the winding layer;

In each winding layer, two adjacent straight portions 9 located 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 6 in the circumferential direction stator slots 6, while the two straight sections 9 are in different layers of the same winding layer;

In each winding layer, two adjacent straight portions 9 of two adjacent flat wire conductors 3 located between the first turn and the second turn are located in two different stator slots 6, and the two different stator slots 6 are 5 stator slots 6 apart in the circumferential direction, while the two straight sections 9 are in different layers of the same winding layer;

Adjacent two 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 separated by 6 stator slots in the circumferential direction 6, while the two straight portions 9 are in two adjacent layers.

As shown in Fig. 8, Fig. 9, Fig. 10, Fig. 11 and Fig. 12, the rear bending part 10 of the flat wire conductor 3 is different according to the unfolded length, in order from long to short: the outlet end 11 , the neutral point end 12, the conventional end 13 and the short span end 14, the flat wire conductors 3 formed by this are classified as:

The first flat wire conductor 15, the two rear bent portions 10 are both conventional ends 13;

For the second flat wire conductor 16, one rear bent portion 10 is the normal end 13, and the other rear bent portion 10 is the short span end 14, and the unfolded length of the short span end 14 is 5/5 of the unfolded length of the normal end 13. 6;

For the third flat wire conductor 17, one rear bent portion 10 is the normal end 13, and the other rear bent portion 10 is the neutral point end 12;

For the fourth flat wire conductor 18, one rear bent portion 10 is the conventional end 13, and the other rear bent portion 10 is the outlet end 11;

In the U-phase, V-phase and W-phase, the outgoing end 11 of the fourth flat wire conductor 18 of one of the two branches of each phase is higher than the outgoing end 11 of the fourth flat wire conductor 18 of the other branch. long;

The second flat wire conductors 16 correspond to two adjacent flat wire conductors 3 between the first turn and the second turn in each winding layer, and two adjacent short spans of two adjacent second flat wire conductors 16 . The straight portion 9 corresponding to the end 14 is located in two different stator slots 6, and the two different stator slots 6 are separated by 5 stator slots 6 in the circumferential direction, and the two straight portions 9 are in different layers of the same winding layer middle;

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 terminal 12 corresponds to the neutral point of the three-phase winding 7;

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

The first flat wire conductor 15 acts on the rest of the three-phase winding 7 .

As shown in Figure 15, Figure 16 and Figure 17, the specific arrangement is described by taking the U-phase winding as an example:

The U-phase branch is first wound for the first turn in the first winding layer. The first rectangular wire conductor 3 in the first winding layer is the fourth rectangular wire conductor 18, and the straight line portion 9 corresponding to the outlet end 11 is located at No. 10. In the first layer 35 of the slot, the straight portion 9 corresponding to the regular end 13 is located in the second layer 36 of the 16th slot, and its outlet end 11 is the U-phase branch lead wire 23;

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

In the first winding layer, the third flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one regular end 13 is located in the first layer 35 of the 34th slot, and the straight line corresponding to the other regular end 13 is located. The part 9 is located in the second layer 36 of the No. 40 slot, and 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 at the free end 5, Complete 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;

In the first winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight portion 9 corresponding to the regular end 13 is located in the first layer 35 of the slot 46, and the straight line corresponding to the short span end 14 Section 9 is located in the second layer 36 of slot 4, the regular end 13 of the fourth flat wire conductor 3 is bent clockwise and the third flat wire conductor 3 is in phase with the normal end 13 of the fourth flat wire conductor 3. The adjacent and counterclockwise regular ends 13 are welded and connected at the free ends 5 to complete the connection of the third rectangular wire conductor 3 and the fourth rectangular wire conductor 3 of the U-phase branch in the first winding layer.

Then the U-phase branch is wound for a 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, and the straight portion 9 corresponding to the short span end 14 is located at In the first layer 35 of the No. 9 slot, the straight portion 9 corresponding to the regular end 13 is located in the second layer 36 of the No. 15 slot, and the fifth flat wire conductor 3 and the fourth flat wire conductor 3 are the first circle and the Between the two adjacent flat wire conductors 3 between the second turns, 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, Complete the connection of the U-phase branch between the first turn and the second turn in the first winding layer;

In the first winding layer, the sixth flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one regular end 13 is located in the first layer 35 of the 21st slot, and the straight line corresponding to the other regular end 13 is located. The part 9 is located in the second layer 36 of the slot No. 27, and the two adjacent and oppositely 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, Complete 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;

In the first winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15, the straight line portion 9 corresponding to one regular end 13 is located in the first layer 35 of the 33rd slot, and the straight line corresponding to the other regular end 13 is located. The part 9 is located in the second layer 36 of the slot No. 39, and the two adjacent and oppositely bent conventional 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, Complete 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;

In the first winding layer, the eighth flat wire conductor 3 is the first flat wire conductor 15, the straight line portion 9 corresponding to one regular end 13 is located in the first layer 35 of slot 45, and the straight line corresponding to the other regular end 13 The part 9 is located in the second layer 36 of the No. 3 slot, and the regular end 13 corresponding to the straight part 9 in the second layer 36 of the No. 3 slot is the connection end of the U-phase branch in the first winding layer, and the seventh The two adjacent and oppositely bent conventional ends 13 of the first flat wire conductor 3 and the eighth flat wire conductor 3 are welded and connected at the free end 5 to complete the seventh U-phase branch in the first winding layer. The connection between the flat wire conductor 3 and the eighth flat wire conductor 3; so far, the connection of the flat wire conductor 3 in the first winding layer of the U-phase branch is completed.

Further, the U-phase branch is wound for the first turn in the second winding layer, the first flat wire conductor 3 in the second winding layer is the first flat wire conductor 15, and the straight line portion 9 corresponding to one of the regular ends 13 is located in the second winding layer. In the third layer 37 of the No. 9 slot, the straight portion 9 corresponding to the other regular end 13 is located in the fourth layer 38 of the No. 15 slot, and the straight portion 9 in the third layer 37 of the No. 9 slot corresponds to the regular end 13 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 performed at the free end 5 Solder connection to complete the connection between the first winding layer of the U-phase branch and the flat conductor 3 of the U-phase branch on the second winding layer;

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 is located in the third layer 37 of the slot 21, and the straight line corresponding to the other regular end 13 The part 9 is located in the fourth layer 38 of the slot No. 27, and the two adjacent and oppositely 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, Complete the connection between the first flat wire conductor 3 and the second flat wire conductor 3 in the second winding layer of the U-phase branch;

In the second winding layer, the third flat wire conductor 3 is the first flat wire conductor 15 , the straight line portion 9 corresponding to one regular end 13 is located in the third layer 37 of slot 33, and the straight line corresponding to the other regular end 13 The part 9 is located in the fourth layer 38 of the slot No. 39, and the two adjacent and oppositely bent conventional ends 13 of the second flat wire conductor 3 and the third flat wire conductor 3 are welded at the free end 5, Complete the connection of the second flat wire conductor 3 and the third flat wire conductor 3 in the second winding layer of the U-phase branch;

In the second winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight line portion 9 corresponding to the regular end 13 is located in the third layer 37 of the slot 45, and the straight line corresponding to the short span end 14 The portion 9 is located in the fourth layer 38 of the slot 3, the normal end 13 of the fourth flat wire conductor 3 is bent clockwise and the third flat wire conductor 3 is in phase with the normal end 13 of the fourth flat wire conductor 3. The adjacent and counterclockwise regular ends 13 are welded and connected at the free ends 5 to complete the connection of the third flat wire conductor 3 and the fourth flat wire conductor 3 of the U-phase branch in the second winding layer.

Then the U-phase branch is wound for a second turn in the second winding layer, and the fifth flat wire conductor 3 in the second winding layer is the second flat wire conductor 16, and the straight portion 9 corresponding to the short span end 14 is located in the second winding layer. In the third layer 37 of the No. 8 slot, the straight portion 9 corresponding to the regular end 13 is located in the fourth layer 38 of the No. 14 slot, and the fifth flat wire conductor 3 and the fourth flat wire conductor 3 are the first and fourth flat wire conductors. Between the two adjacent flat wire conductors 3 between the second turns, 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, Complete the connection of the U-phase branch between the first turn and the second turn in the second winding layer;

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

In the second winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15 , the straight line portion 9 corresponding to one regular end 13 is located in the third layer 37 of slot 32, and the straight line corresponding to the other regular end 13 The part 9 is located in the fourth layer 38 of the slot No. 38, and the two adjacent and oppositely bent conventional 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, Complete the connection of the sixth flat wire conductor 3 and the seventh flat wire conductor 3 in the second winding layer of the U-phase branch;

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 the normal end 13 is located in the third layer 37 of the slot 44, and the straight portion corresponding to the neutral end 12 9 is located in the fourth layer 38 of No. 2 slot, and its neutral point end 12 is the neutral point 24 of the U-phase branch, the eighth flat wire conductor 3 is the normal end 13 bent clockwise, and the seventh flat wire conductor In 3, the conventional end 13 adjacent to the normal end 13 of the eighth flat wire conductor 3 and bent counterclockwise is welded and connected at the free end 5 to complete the U-phase branch in the second winding layer. The seventh flat wire The connection between the conductor 3 and the eighth flat wire conductor 3; so far, the connection of the flat wire conductor 3 in the second winding layer of the U-phase branch is completed.

Referring to the arrangement of the U-phase branch, the U-phase two branches are firstly wound around the first and second turns in the second winding layer, and then the first and second turns are respectively wound in the first winding layer;

First, the first flat wire conductor 3 of the U-phase two branches in the second winding layer is the fourth flat wire conductor 18, and the straight portion 9 corresponding to the outlet end 11 is located in the fourth layer 38 of the No. 44 slot. Conventional The straight portion 9 corresponding to the end 13 is located in the third layer 37 of the No. 38 slot, and its outlet end 11 is the U-phase two-branch lead wire 25;

Then, the arrangement of the U-phase two branches is that the arrangement direction is opposite to that of the U-phase branch, and the connection method is the same as that of the U-phase branch. The specific location of each flat conductor 3 is as follows:

The U-phase two branches are 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 lines 9 are located in the fourth layer 38 and 26 of the 32 slot, respectively. In the third layer 37 of the No. 20 slot; the third flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight lines 9 are located in the fourth layer 38 of the No. 20 slot and the third layer 37 of the No. 14 slot respectively. The fourth flat wire conductor 3 is the second flat wire conductor 16, and the corresponding two straight line parts 9 are respectively located in the fourth layer 38 of the No. 8 slot and the third layer 37 of the No. 2 slot;

The U-phase two branches are 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 parts 9 are located in the fourth layer 38 and 39 of the 45th slot, respectively. In the third layer 37 of the No. 3 slot; the sixth flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight lines 9 are located in the fourth layer 38 of the No. 33 slot and the third layer 37 of the No. 27 slot respectively. In; the seventh flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line parts 9 are respectively located in the fourth layer 38 of the 21st slot and the third layer 37 of the 15th slot; the eighth flat wire The conductor 3 is the first flat wire conductor 15, and the corresponding two straight portions 9 are respectively located in the fourth layer 38 of the No. 9 slot and the third layer 37 of the No. 3 slot;

The U-phase two branches are 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 parts 9 are located in the second layer 36 and 39 of the 45th slot respectively. The second flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line parts 9 are respectively located in the second layer 36 of the No. 33 slot and the first layer 35 of the No. 27 slot. middle; the third flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line parts 9 are respectively located in the second layer 36 of the 21st slot and the first layer 35 of the 15th slot; the fourth flat wire The conductor 3 is the second flat wire conductor 16, and the corresponding two straight line parts 9 are respectively located in the second layer 36 of the No. 9 slot and the first layer 35 of the No. 3 slot;

The U-phase two branches are 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 lines 9 are located in the second layer 36 and 40 of the 46th slot respectively. The sixth flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight lines 9 are located in the second layer 36 of the No. 34 slot and the first layer 35 of the No. 28 slot respectively. In; the seventh flat wire conductor 3 is the first flat wire conductor 15, and the corresponding two straight line parts 9 are respectively located in the second layer 36 of the No. 22 slot and the first layer 35 of the No. 16 slot;

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

As shown in FIG. 16 , according to the arrangement of U-phase windings, the V-phase windings and W-phase windings are arranged, wherein: The V-phase branch lead wire 27 is located in the first layer 35 of the 14th slot, and the V-phase branch leads 27 The neutral point 28 of the phase branch is located in the fourth layer 38 of the No. 6 slot, the V-phase two branch lead wire 29 is located in the fourth layer 38 of the No. 48 slot, and the V-phase two branch neutral point 30 is located in No. 8 In the first layer 35 of the slot, the lead wire 31 of the W-phase branch is located in the first layer 35 of the No. 18 slot, the neutral point 32 of the W-phase branch is located in the fourth layer 38 of the No. 10 slot, and the W-phase two branches are located in the first layer 35 of the No. 18 slot. The road lead 33 is located in the fourth layer 38 of the No. 4 slot, and the neutral point 34 of the W-phase two branches is located in the first layer 35 of the No. 12 slot.

The three-phase windings 7 arranged in this way have different spacings between the two straight portions 9 of the flat wire conductors 3 in different winding layers. The distance between the two straight portions 9 of the wire conductor 3.

As shown in FIG. 1 , FIG. 2 and FIG. 13 , in the three-phase winding 7 , the U-phase branch lead 23 and the U-phase two-branch lead 25 are connected by welding at the free end 5 , V The phase branch lead-out line 27 and the V-phase two-branch lead-out line 29 are welded and connected at the free end 5, and the W-phase branch lead-out line 31 and the W-phase two-branch lead-out line 33 are welded and connected at the free end 5 , U-phase branch neutral point 24, U-phase two branch neutral point 26, V-phase branch neutral point 28, V-phase two branch neutral point 30, W-phase branch neutral point 32 The neutral point 34 of the two branches and the W-phase are connected at the free end 5 through a copper ring 19 .

As shown in FIG. 14 , the copper ring 19 is an arc-shaped flat sheet, and six welding holes 22 are provided on the copper ring, and all the neutral point ends 12 are welded in the welding holes 22 .

Preferably, as shown in FIG. 6 and FIG. 7 , the stator slot 6 of the stator core 2 is rectangular.

Preferably, as shown in FIG. 1 and FIG. 3 , the outer circumference of the stator core 2 is provided with a weld slot 20 and a key slot 21 .

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

The following descriptions are made for other implementations of the present invention and structural changes:

1. In the above embodiment, 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. The branch lead-out line 25 and other final arrangement results in 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.

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

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention. The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those who are familiar with the art to understand the content of the present invention and implement them accordingly, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention should be included within the protection scope of the present invention.

Claims (8)

1. A stator of a new type of flat wire motor, the number of slots per pole and phase of the motor is defined as 2, and the number of pole pairs is p, the stator (1) includes a stator core (2) and a winding, and the winding consists of a plurality of The flat wire conductor (3) consists of: One end of the stator (1) in the axial direction is a bent end (4), and the other end is a free end (5); The section of the stator core (2) is annular, and the inner wall of the stator core (2) is evenly provided with z axial through stator slots (6) along the circumferential direction, and the openings of the stator slots (6) are all facing the stator iron Core (2) axis, and satisfy z=12p; The winding is a star-connected three-phase winding (7), and the three-phase winding (7) includes a U-phase winding, a V-phase winding and a W-phase winding; Each of the flat wire conductors (3) is formed by bending a flat wire through a die, the bending shape of the flat wire conductor (3) is a hairpin, and each flat wire conductor (3) is formed by a bending part ( 8), two straight parts (9) and two back bending parts (10), wherein the bending part (8) is formed by bending the flat wire at the middle position to form the hairpin-shaped flat wire conductor (3). At the included angle, the two back bending parts (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). 9) The flat wire conductors (3) are parallel to each other. One end of the two straight line parts (9) is connected to the bending part (8), and the other end is connected to a back bending part (10) to form a hairpin-shaped flat wire conductor (3). straight sections on both sides; In the installed state, in each of the flat wire conductors (3), the straight part (9) is arranged in the stator slot (6) along the axial direction of the stator iron core (2), and the bent part (8) is arranged in the stator slot (6) At the bent end (4) of the stator (1), the back bent part is arranged at the free end (5) of the stator (1). Viewed from the end face of the free end (5) of the stator (1), the same flat conductor Among the two back-bending parts (10) of (3), one back-bending part (10) is bent clockwise towards the end face based on the connected straight part (9), and the other back-bending part (10) is The connected straight line portion (9) is bent counterclockwise toward the end face as a reference, wherein the back bent portion (10) bent clockwise and the back bent portion (10) of an adjacent flat conductor (3) bent counterclockwise ) welding connection, the back bending part (10) bent counterclockwise is welded and connected with the back bending part (10) bent clockwise of another adjacent flat wire conductor (3), so as to form each phase winding in this connection mode, The windings of each phase are arranged in a plurality of the stator slots (6) in sequence along the circumferential direction of the stator iron core (2); It is characterized by: The stator (1) is viewed from the perspective of its cross-section, and the cross-section of the straight portion (9) of each flat wire conductor (3) is formed in the stator slot (6) from the outside to the inside along the radial direction of the stator core (2). Layer structure, the number of layers in the radial direction of the stator core (2) is sorted from outside to inside as the first layer (35), the second layer (36), the third layer (37), the fourth layer (38) until Layer 4n, where n is a positive integer, where the first layer (35) and the second layer (36) in all stator slots (6) are defined as the first winding layer, and the third layer in all stator slots (6) (37) and the fourth layer (38) are defined as the second winding layer, and so on; In the three-phase winding (7), the windings of each phase are arranged in two turns in the circumferential direction in the first winding layer to form the first turn of the first winding layer and the second turn of the first winding layer, and then span to the first winding layer. Two turns are arranged in the circumferential direction in the second winding layer to form the first turn of the second winding layer and the second turn of the second winding layer, so as to be cyclically arranged in each winding layer up to each stator slot of the stator core (2) (6) until each layer is filled with three-phase windings (7), of which: The two straight sections (9) in each flat wire conductor (3) are located in two different stator slots (6), and the two different stator slots (6) are circumferentially separated by z/2p stator slots ( 6), while the two straight sections (9) are in different layers of the same winding layer; In each winding layer, two adjacent straight portions (9) located in two adjacent flat wire conductors (3) of the same turn are located in two different stator slots (6), and the two different stator slots ( 6) z/2p stator slots (6) spaced apart in the circumferential direction, while the two straight sections (9) are in different layers of the same winding layer; In each winding layer, two adjacent straight portions (9) of two adjacent flat wire conductors (3) located 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 z/2p-1 stator slots (6), while the two straight portions (9) are in different layers of the same winding layer; Adjacent two 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 in Circumferentially z/2p stator slots (6) are spaced apart, while the two straight sections (9) are in adjacent layers. 2 . The stator according to claim 1 , characterized in that: the rear bent parts ( 10 ) of the flat wire conductors ( 3 ) are different in length according to the unfolded length, and the order from long to short is: the outlet end ( 11 ), the middle The flat wire conductors (3) formed by this are classified into: the first flat wire conductor (15), the two rear bending parts (10) of which are both conventional ends (13); For the second flat wire conductor (16), one of the back bent parts (10) is the regular end (13), and the other back bent part (10) is the short span end (14); For the third flat wire conductor (17), one of the back bent parts (10) is the normal end (13), and the other back bent part (10) is the neutral point end (12); the fourth flat wire conductor (18), one of the rear bent parts (10) is the conventional end (13), and the other rear bent part (10) is the outlet end (11); The second flat wire conductors (16) correspond to two adjacent flat wire conductors (3) between the first turn and the second turn in each winding layer, and the two adjacent flat wire conductors (16) The straight portions (9) corresponding to the two adjacent short span ends (14) are located in two different stator slots (6), and the two different stator slots (6) are z/2p-1 apart in the circumferential direction stator slots (6), while the two straight sections (9) are in different layers of the same winding layer; 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 three-phase winding (7) the neutral point; The fourth flat wire conductor (18) is used as the connection at the lead wire in the star-connected structure of the three-phase winding (7), and the lead wire end (11) corresponds to the lead wire of the three-phase winding (7); The first flat wire conductor (15) acts on the rest of the three-phase winding (7). 3. The stator according to claim 2, characterized in that: in the three-phase winding (7), the outgoing end (11) of the fourth flat wire conductor (18) of each phase is at the free end (5) For connection by welding, the neutral point ends (12) of the third flat wire conductors (17) of each phase are connected at the free ends (5) through 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 the copper ring is provided with welding holes (22), and all the neutral point ends (12) ) are welded in the welding hole (22). 5 . The stator according to claim 1 , wherein the distance between the two straight portions ( 9 ) of the flat wire conductors ( 3 ) of the three-phase winding ( 7 ) in different winding layers is different, and the first winding layer The spacing between the two straight parts of the flat wire conductor (3) is greater than the spacing between the two straight parts (9) of the flat wire conductor (3) of the second winding layer, and so on. 6 . The stator according to claim 1 , wherein the stator slots ( 6 ) of the stator iron core ( 2 ) are rectangular. 7 . 7 . The stator according to claim 1 , wherein the stator core ( 2 ) is provided with a weld slot ( 20 ) and a key slot ( 21 ) on its outer circumference. 8 . 8 . The stator according to claim 3 , characterized in that: the position of the flat wire conductor ( 3 ) at the free end ( 5 ) and the copper ring ( 19 ) are coated with a layer of insulating powder. 9 .

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