CN111342576A - Stator of novel 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 novel flat wire motor

Technical Field

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

Background

With the development of new energy vehicles and the increasing maturity of the market, the motor is used as a main power source of the new energy vehicles, particularly as the only power source of pure electric vehicles, and the requirements on torque density, power density and efficiency are higher and higher, so that the requirements on the aspects of the whole vehicle dynamic property, economy and the like of the new energy vehicles are met. The contradiction between the performance and the volume of the motor is increasingly prominent due to the double pressure of the performance and the cost.

For a permanent magnet synchronous motor, particularly for a vehicle permanent magnet synchronous motor, a flat wire winding, namely a rectangular conductor, is placed in a stator slot of the permanent magnet synchronous motor, so that the filling rate of the stator slot of the motor can be effectively improved, the material utilization rate of the stator is improved, and the copper consumption of the motor is reduced to improve the efficiency of the motor. Meanwhile, the height of the end part of the winding coil of the motor can be effectively reduced, so that the size of the motor is saved. However, compared with the conventional round wire winding, the coil winding of the flat wire winding still has many difficulties in the offline aspect, and the offline process flow of the winding is difficult to be automatically completed by using machinery.

Therefore, the prior art makes many improvements on the flat wire winding, but still has the following disadvantages: patent document CN200780022091.7 proposes a stator of flat wire, but the number of the flat wires of the motor is large, and the connection wires between the windings of different phases require extra conductors, which further increases the cost of the mold and the cost of the process; patent document CN201710878010.9 proposes a stator of a flat wire, which is optimized for the linear shape of the flat wire, and reduces the types of the linear shape, but the lead wire of the motor is complicated, and the stator of the motor still needs to increase the height of the welding point on the welding side and the height of the outgoing wire on the bending side respectively; patent document CN201910367345.3 proposes a flat wire stator, which is formed by bending a set of flat wire conductors together on one side and then separately bending and welding the other side, so as to avoid increasing the height of the welding point on the welding side and the height of the lead wire and the lead wire on the bending side, but because the flat wire conductors are bent together on one side, the stretchability of the flat wire conductors of the motor and the adhesion capability of the paint film face extremely large challenges.

Aiming at the problems, the invention provides a novel stator of a flat wire motor, which improves the motor efficiency by designing a novel winding mode, simultaneously solves the problems that the flat wire stator respectively increases the height of a welding side welding spot and the heights of a bending side lead wire and a lead wire, controls the linear quantity of flat wire conductors, and reduces the quantity of flat wire conductor forming dies, thereby reducing the integral production difficulty and cost of the motor.

Disclosure of Invention

The invention aims to provide a novel stator of a flat wire motor.

In order to achieve the purpose, the invention adopts the technical scheme that:

the utility model provides a novel flat wire motor's stator, defines every utmost point of motor is every looks slot number 2, and the number of pole pairs is p, the stator includes stator core and winding, and the winding comprises a plurality of flat wire conductors, wherein:

one end of the stator in the axial direction is a bending end, and the other end of the stator is a free end;

the section of the stator core is circular, z axially-through stator slots are uniformly formed in the inner wall of the stator core along the circumferential direction, and z =12p is met;

the winding is a three-phase winding in star connection, and the three-phase winding comprises a U-phase winding, a V-phase winding and a W-phase winding;

each flat wire conductor is formed by bending a flat wire through a die, the bent shape of the flat wire conductor is hairpin-shaped, each flat wire conductor consists of a bent part, two straight line parts and two rear bent parts, wherein the bent part is formed by bending the flat wire at the middle position to form an included angle part of the hairpin-shaped flat wire conductor, the two rear bent parts are formed by bending the head end and the tail end of the flat wire in opposite directions to form open support legs at two sides of an opening of the hairpin-shaped flat wire conductor, the two straight line parts are mutually parallel in the flat wire conductor, the uniform ends of the two straight line parts are connected with the bent parts, and the other ends of the two straight line parts are connected with the rear bent parts to form straight sections at two sides of the hairpin-shaped flat wire conductor;

in the installation state, the straight line parts of the flat wire conductors are all arranged in the stator slot along the axial direction of the stator core, the bending parts are all arranged at the bending end of the stator, the back bending parts are all arranged at the free end of the stator, when the stator is observed towards the end surface of the free end of the stator, one back bending part of the two back bending parts of the same flat wire conductor is bent towards the end surface clockwise by taking the straight line part connected with the back bending part as the reference, the other back bending part of the two back bending parts is bent towards the end surface anticlockwise by taking the straight line part connected with the back bending part as the reference, wherein, the back bending part bent clockwise is connected with the back bending part bent anticlockwise of one adjacent flat wire conductor in a welding way, the back bending part bent anticlockwise is connected with the back bending part bent clockwise of the other adjacent flat wire conductor in a welding way, each phase winding is formed in the connection mode and sequentially and circularly arranged in the plurality of stator slots along the circumferential direction of the stator core;

when the stator is observed from the cross section angle, the sections of the straight line parts of the flat wire conductors form a multilayer structure in the stator slots from outside to inside along the radial direction of the stator core, the number of layers of the stator cores is divided into a first layer, a second layer, a third layer, a fourth layer and a 4n th layer from outside to inside in the radial direction of the stator core, n is a positive integer, wherein the first layer and the second layer in all the stator slots are defined as a first winding layer, the third layer and the fourth layer in all the stator slots are defined as a second winding layer, and the like;

in the three-phase winding, each phase winding is arranged in a first winding layer along the circumferential direction for two circles to form a first circle of the first winding layer and a second circle of the first winding layer, and then spans the second winding layer and is arranged in the circumferential direction for two circles to form a first circle of the second winding layer and a second circle of the second winding layer, so that the three-phase winding is circularly arranged in each winding layer until each stator slot layer of the stator core is filled with the three-phase winding, wherein:

two straight line parts in each flat wire conductor are positioned in two different stator slots, the two different stator slots are separated by z/2p stator slots in the circumferential direction, and the two straight line parts are positioned in different layers of the same winding layer;

in each winding layer, two adjacent straight line parts in two adjacent flat wire conductors in the same circle are positioned in two different stator slots, the two different stator slots are separated by z/2p stator slots in the circumferential direction, and the two straight line parts are positioned in different layers of the same winding layer;

in each winding layer, two adjacent straight line parts in two adjacent flat wire conductors positioned between the first circle and the second circle are positioned in two different stator slots, the two different stator slots are spaced from each other by z/2p-1 stator slots in the circumferential direction, and the two straight line parts are positioned in different layers of the same winding layer;

two adjacent straight portions of two adjacent flat wire conductors between different winding layers are located in two different stator slots that are z/2p stator slots apart in the circumferential direction while the two straight portions are in the adjacent layers.

Preferably, the back-bent portion of the flat wire conductor is different according to the length of the spread, and the length of the back-bent portion is as follows: the outlet terminal, the neutral point terminal, the regular terminal, and the short span terminal, and the flat wire conductor composed of them is classified into:

the two rear bending parts of the first flat wire conductor are both conventional ends;

one back bending part of the second flat wire conductor is a conventional end, and the other back bending part of the second flat wire conductor is a short span end;

one back bending part of the third flat wire conductor is a conventional end, and the other back bending part of the third flat wire conductor is a neutral point end;

one back bending part of the fourth flat wire conductor is a conventional end, and the other back bending part of the fourth flat wire conductor is an outlet end;

the second flat wire conductors correspond to two adjacent flat wire conductors between the first ring and the second ring in each winding layer, the straight line parts corresponding to two adjacent short span ends of the two adjacent second flat wire conductors are positioned in two different stator slots, the two different stator slots are separated by z/2p-1 stator slots in the circumferential direction, and the two straight line parts are positioned in different layers of the same winding layer;

the third flat wire conductor is used as a wiring at a 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;

the fourth flat wire conductor is used as a connection wire at the outgoing line in the star-connected structure of the three-phase winding, and the outgoing line end is correspondingly used as the outgoing line of the three-phase winding;

the first flat wire conductor acts on the remaining portion of the three-phase winding.

Preferably, the distances between two straight line parts of the flat wire conductors of the three-phase winding on different turns are different, because the three-phase winding is wound in the stator core from outside to inside along the radial direction, the circumferential size of the three-phase winding is shortened when the turns are increased, the distance between the two straight line parts of the flat wire conductor of the first turn is larger than the distance between the two straight line parts of the flat wire conductor of the second turn, the distance between the two straight line parts of the flat wire conductor of the second turn is larger than the distance between the two straight line parts of the flat wire conductor of the third turn, and so on, each turn is provided with the first flat wire conductor, the second flat wire conductor, the third flat wire conductor and the fourth flat wire conductor.

Preferably, in the three-phase winding, the outlet end of the fourth flat wire conductor of each phase is connected to the free end by welding, and the neutral point end of the third flat wire conductor of each phase is connected to the free end by a copper ring.

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

Preferably, the distances between the two straight line parts of the flat wire conductor of the three-phase winding in different winding layers are different, the distance between the two straight line parts of the flat wire conductor of the first winding layer is larger than the distance between the two straight line parts of the flat wire conductor of the second winding layer, and so on.

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

Preferably, the stator core is provided with weld grooves and key grooves on an outer circle thereof.

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

The relevant content in the above technical solution is explained as follows:

1. in the above scheme, in each winding layer, the number of the stator slots at a distance between two adjacent straight line portions in every two adjacent flat line conductors in the same circle is one more than that of two adjacent straight line portions in two adjacent flat line conductors between the first circle and the second circle, so that the flat line conductors of each three-phase winding are arranged in a staggered manner, the winding arrangement mode can improve the motor efficiency, and reduce the copper loss and the alternating current resistance loss.

2. In the scheme, the flat wire conductors are 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 different unfolding lengths of the rear bent parts, adjacent flat wire conductors are connected through welding of the adjacent rear bent parts, each phase of winding is formed in the connection mode, conventional connection, short-span connection, neutral point connection and outgoing line connection are achieved by means of different lengths of the rear bent parts of different types of flat wire conductors, special flat wire conductors do not need to be additionally arranged, and line type processing is simple.

3. In the scheme, because various flat wire conductors with different lengths of the winding mode and the back bending part which are arranged in a staggered mode are used, the free end of the stator can be used as the welding connection side of each flat wire conductor and also can be used as the wiring side of the leading-out end of each fourth flat wire conductor and the neutral point end of each third flat wire conductor, the welding position and the wiring position are arranged on the same side, the bending end can have a shorter end part height, and the free end simultaneously plays roles of welding and wiring, so that the axial space of the motor can be saved, the torque density and the power density of the motor are increased, and the purpose of reducing the cost is achieved.

4. In the above scheme, when two adjacent stator slots in the stator core are closer to the axis of the stator core, the closer the two stator slots are, because the linear parts of each flat wire conductor form a multilayer structure from outside to inside in the stator slots, when the number of layers increases, the radial distance between the flat wire conductor and the axis of the stator is shortened, so that the two linear parts in the flat wire conductor are spaced by the same number of stator slots, but the distance between the two linear parts is also shortened along with the increase of the number of layers, in addition, the invention realizes the connection of different functions by depending on the different lengths of the post-bent parts of different types of flat wire conductors, and realizes the connection of different functions of the flat wire conductor by changing the different span linear parts into the connection of different lengths of the post-bent parts, so that the obtained flat wire conductor has only one difference except the different lengths of the post-bent parts, namely, the distance between the two linear parts of the flat wire conductor is different due to the reason of being placed in different, then the difference in bending part length need not to realize through mould processing, only need control raw and other materials length can realize, only need use the mould of corresponding quantity according to the figure of winding layer when consequently processing the flat wire conductor, the required mould quantity of significantly reduced, if in 8 utmost point 48 groove motors, the number of piles in the stator slot is four layers, two straight line portion are located the flat wire conductor on first layer and second floor respectively, the interval on its two straight line portions is the same, can use one set of mould, two straight line portion are located third layer and fourth layer flat wire conductor respectively, the interval on its two straight line portions is the same, can use another set of mould, conductor processing can be accomplished to two sets of moulds that need altogether, compare prior art, use mould quantity significantly reduced, the effectual mould expense and the production complexity that have reduced.

5. In the scheme, the neutral point outgoing lines are connected by using the copper rings, so that the connection mode of jumper wires is avoided.

6. In the scheme, the stator slots of the stator core are rectangular and are matched with the flat wire winding, so that the filling rate of the stator slots of the motor can be effectively improved, the material utilization rate of the stator is improved, and the efficiency of the motor is improved by reducing the copper consumption of the motor.

7. In the scheme, the part of the flat wire conductor at the free end and the copper ring are coated with a layer of insulating powder so as to ensure the insulating property of the motor.

8. In the scheme, the stator core is provided with the weld groove and the key groove on the excircle thereof, the weld groove is used for welding the stator core and the motor shell, and the key groove is used for positioning the stator core on the motor shell.

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

the axial length of the stator is short, the welding position and the wiring position of the three-phase winding are placed on the same side of the stator, the axial space of the motor is effectively saved, and therefore the torque density and the power density of the motor are increased.

And secondly, the line type is less, the processing is simple, the flat wire conductors at different positions are connected conventionally, in short span, in neutral point and outgoing line through the different lengths of the corresponding back bending parts, and the special flat wire conductor for connection is not required to be additionally added.

The mold is low in cost, the distance between two straight line parts of the flat wire conductor placed in different winding layers is different, the difference in the length of the bent part is not required to be realized through mold processing, only the length of raw materials is required to be controlled, and therefore different molds are only required to be used according to different distances between two straight line parts of the flat wire conductor when the flat wire conductor is processed, and the number of required molds is greatly reduced.

Drawings

FIG. 1 is a perspective view of a stator;

FIG. 2 is a partially enlarged view of portion A of FIG. 1

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

FIG. 4 is a radial cross-sectional view of a stator core;

FIG. 5 is a front view of a flat wire conductor;

FIG. 6 is a perspective radial cross-sectional view of a stator;

FIG. 7 is an enlarged view of a portion B of FIG. 5;

FIG. 8 is a front view of a first flat wire conductor;

FIG. 9 is a front view of a second flat wire conductor;

FIG. 10 is a front view of a third flat wire conductor;

FIG. 11 is a front view of a fourth flat wire conductor;

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

FIG. 13 is a partial view of a winding lead portion;

FIG. 14 is an oblique view of a copper ring;

FIG. 15 is an electrical schematic of the U-phase one branch in an 8-pole 48-slot machine;

FIG. 16 is a schematic diagram of the U-phase, V-phase and W-phase electrical devices in an 8-pole 48-slot motor;

fig. 17 is a layout diagram of U-phase one and two branches in stator slots in an 8-pole 48-slot motor;

FIG. 18 is a schematic view of the arrangement of two flat wire conductors in the stator slots;

in the above drawings: 1. a stator; 2, a stator core; a flat wire conductor; bending the end; 5, a free end; 6, stator slots; 7. a three-phase winding; 8, bending the part; a linear portion; 10, a back bending part; 11, an outlet terminal; neutral point end; 13. a conventional terminal; short span end 14; a first flat wire conductor; a second flat wire conductor; a third flat wire conductor; 18. a fourth flat wire conductor; a copper ring; 20, welding seam grooves; a keyway; welding holes; leading out a line from a U-phase branch circuit; a U-phase branch neutral point; 25, a U-phase two-branch outgoing line; 26, a neutral point of the U-phase two-branch circuit; a V-phase branch leading-out line; a V-phase branch neutral point; a V-phase two-branch outgoing line; a V-phase two-branch neutral point; a W-phase branch leading-out line; a W-phase branch neutral point; a W-phase two-branch outgoing line; 34. a W-phase two-branch neutral point; 35. a first layer; 36. a second layer; 37. a third layer; 38. and a fourth layer.

Detailed Description

The invention is further described with reference to the following figures and examples:

example (b): stator of novel flat wire motor

The present disclosure will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the disclosure may be shown and described, and which, when modified and varied by the techniques taught herein, can be made by those skilled in the art without departing from the spirit and scope of the disclosure.

As used herein, "connected" or "positioned" refers to two or more elements or devices being in direct physical contact with each other or in indirect physical contact with each other, and may also refer to two or more elements or devices being in operation or acting on each other.

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

As used herein, the term (terms), unless otherwise indicated, shall generally have the ordinary meaning as commonly understood by one of ordinary skill in the art, in this written description and in the claims. Certain words used to describe the disclosure are discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the disclosure.

The working principle of the present invention is now explained as follows:

referring to fig. 1 to 18, a stator of a novel flat wire motor, the number of slots per pole per phase of the motor is 2, the number of pole pairs is 4, the stator 1 comprises a stator core 2 and a winding, and the winding is composed of a plurality of flat wire conductors 3.

As shown in fig. 3, the stator 1 is defined to have a bent end 4 at one axial end and a free end 5 at the other axial end.

As shown in fig. 4 and 16, the cross section of the stator core 2 is circular, 48 axially through stator slots 6 are uniformly formed in the inner wall of the stator core 2 along the circumferential direction, the openings of the stator slots 6 face the axis of the stator core 2, and any one stator slot 6 on the stator core 2 is defined as a No. 1 slot, and the other No. 2-48 slots are sequentially arranged on the circumference of the stator core 2 in the counterclockwise direction.

As shown in fig. 16, 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, where each phase winding has 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 bent shape of the flat wire conductor 3 is hairpin-shaped, each of the flat wire conductors 3 is composed of a bent portion 8, two straight portions 9 and two post-bent portions 10, wherein the bent portion 8 is formed by bending the flat wire at a middle position to form an included angle portion of the hairpin-shaped flat wire conductor 3, the two post-bent portions 10 are formed by bending the head and tail ends of the flat wire in opposite directions to form open legs at two sides of an 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, the two straight portions 9 are connected at one end to the bent portion 8, and the other end is connected to the post-bent portion 10 to form straight sections at two sides of the hairpin-shaped flat wire conductor 3.

As shown in fig. 1 and fig. 2, in the installed state, in each flat wire conductor 3, the straight line parts 9 are all arranged in the stator slot 6 along the axial direction of the stator core 2, the bent parts 8 are all arranged at the bent end 4 of the stator 1, the back bent parts are all arranged at the free end 5 of the stator 1, when viewed from the end surface of the free end 5 of the stator 1, one back bent part 10 of two back bent parts 10 of the same flat wire conductor 3 is bent clockwise towards the end surface by taking the straight line part 9 connected with the back bent part as a reference, the other back bent part 10 is bent anticlockwise towards the end surface by taking the straight line part 9 connected with the back bent part 10 as a reference, wherein the back bent part 10 bent clockwise is welded and connected with the back bent part 10 bent anticlockwise of the adjacent flat wire conductor 3, the back bent part 10 bent anticlockwise is welded and connected with the back bent part 10 bent clockwise and connected with the other back bent part 10 bent, the phase windings are formed in this connection manner, and are sequentially and circularly arranged in the stator slots 6 along the circumferential direction of the stator core 2.

As shown in fig. 6, 7 and 18, when the stator 1 is viewed in cross section, the sections of the straight line portions 9 of the respective flat wire conductors 3 form a multilayer structure in the stator slots 6 from outside to inside along the radial direction of the stator core 2, and the number of layers is ordered from outside to inside along the radial direction of the stator core 2 into a first layer 35, a second layer 36, a third layer 37 and a fourth layer 38, wherein the first layer 35 and the second layer 36 in all the stator slots 6 are defined as a first winding layer, and the third layer 37 and the fourth layer 38 in all the stator slots 6 are defined as a second winding layer.

As shown in fig. 15, 16 and 17, in the three-phase winding 7, each phase winding is arranged in the first winding layer for two circles along the circumferential direction to form a first circle of the first winding layer and a second circle of the first winding layer, and then arranged in the second winding layer for two circles along the circumferential direction to form a first circle of the second winding layer and a second circle of the second winding layer, so that the 48 stator slots 6 of the stator core 2 are circularly arranged in the first winding layer and the second winding layer, and the total 192 levels of the U phase, the V phase and the W phase of the three-phase winding 7 are filled up by the U phase, the V phase and the W phase, which respectively occupy 64 levels, of 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 circumferentially spaced 6 stator slots 6 apart, while the two straight portions 9 are in different layers of the same winding layer;

in each winding layer, two adjacent straight line portions 9 of 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 spaced 6 stator slots 6 apart in the circumferential direction, while the two straight line portions 9 are in different layers of the same winding layer;

in each winding layer, two adjacent straight parts 9 of two adjacent flat wire conductors 3 between the first and second turns are 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, while the two straight parts 9 are in different layers of the same winding layer;

two adjacent straight portions 9 of 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 by 6 stator slots 6, while the two straight portions 9 are located in two adjacent layers.

As shown in fig. 8, 9, 10, 11 and 12, the back bent portion 10 of the flat wire conductor 3 is different in length from long to short: the outlet end 11, the neutral point end 12, the regular end 13, and the short span end 14, and the flat wire conductor 3 thus composed is classified into:

a first flat wire conductor 15 of which both rear bent portions 10 are regular ends 13;

a second flat wire conductor 16, one back-bent part 10 of which is a normal end 13, the other back-bent part 10 of which is a short span end 14, and the expansion length of the short span end 14 is 5/6 of the expansion length of the normal end 13;

a third flat wire conductor 17, one back-bent part 10 of which is a regular end 13, and the other back-bent part 10 of which is a neutral point end 12;

a fourth flat wire conductor 18, one back bending part 10 of which is a conventional end 13, and the other back bending part 10 of which is an outlet end 11;

in the U phase, the V phase and the 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;

the second flat wire conductors 16 correspond to two adjacent flat wire conductors 3 between the first ring and the second ring in each winding layer, the straight line parts 9 corresponding to two adjacent short span ends 14 of the two adjacent second flat wire conductors 16 are positioned in two different stator slots 6, the two different stator slots 6 are separated by 5 stator slots 6 in the circumferential direction, and the two straight line parts 9 are positioned in different layers of the same winding layer;

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

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

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

As shown in fig. 15, 16 and 17, the specific arrangement is illustrated by taking a U-phase winding as an example:

a U-phase branch circuit is firstly wound in a first winding layer for a first circle, a first flat wire conductor 3 in the first winding layer is a fourth flat wire conductor 18, a straight line part 9 corresponding to an outlet end 11 of the fourth flat wire conductor is positioned in a first layer 35 of a No. 10 slot, a straight line part 9 corresponding to a conventional end 13 of the fourth flat wire conductor is positioned in a second layer 36 of a No. 16 slot, and an outlet end 11 of the fourth flat wire conductor is a U-phase branch outlet wire 23;

in the first winding layer, the second flat wire conductor 3 is a first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the second flat wire conductor is positioned in the first layer 35 of the No. 22 slot, the straight line part 9 corresponding to the other conventional end 13 of the second flat wire conductor is positioned in the second layer 36 of the No. 28 slot, at the moment, the conventional end 13 bent anticlockwise of the first flat wire conductor 3 and the conventional end 13 adjacent to the conventional end 13 of the first flat wire conductor 3 and bent clockwise in the second flat wire conductor 3 are welded and connected at the free end 5, and the connection of the first flat wire conductor 3 and the second flat wire conductor 3 in the first winding layer of the U-phase first branch is completed;

in the first winding layer, the third flat wire conductor 3 is a first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the first layer 35 of the No. 34 slot, the straight line part 9 corresponding to the other conventional end 13 of the first flat wire conductor is positioned in the second layer 36 of the No. 40 slot, two adjacent and reversely bent conventional ends 13 in the second flat wire conductor 3 and the third flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the first winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight line part 9 corresponding to the conventional end 13 of the fourth flat wire conductor is positioned in the first layer 35 of the No. 46 slot, the straight line part 9 corresponding to the short span end 14 of the fourth flat wire conductor is positioned in the second layer 36 of the No. 4 slot, the conventional end 13 bent clockwise in the fourth flat wire conductor 3 and the conventional end 13 adjacent to the conventional end 13 of the fourth flat wire conductor 3 and bent anticlockwise in the third flat wire conductor 3 are welded and connected at the free end 5, and the connection of the third flat wire conductor 3 and the fourth flat wire conductor 3 in the first winding layer of the U-phase first branch is completed.

Then, a U-phase first branch is wound in a first winding layer for a second circle, a fifth flat wire conductor 3 in the first winding layer is a second flat wire conductor 16, a straight line part 9 corresponding to a short span end 14 of the second flat wire conductor is positioned in a first layer 35 of a No. 9 slot, a straight line part 9 corresponding to a conventional end 13 of the second flat wire conductor is positioned in a second layer 36 of a No. 15 slot, a fifth flat wire conductor 3 and a fourth flat wire conductor 3 are two adjacent flat wire conductors 3 between the first circle and the second circle, 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 connected in a welding mode at a free end 5, and the connection of the U-phase first branch between the first circle and the second circle in the first winding layer is completed;

in the first winding layer, the sixth flat wire conductor 3 is a first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the sixth flat wire conductor is positioned in the first layer 35 of the No. 21 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the second layer 36 of the No. 27 slot, two adjacent and reversely bent conventional ends 13 in the fifth flat wire conductor 3 and the sixth flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the first winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the first layer 35 of the No. 33 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the second layer 36 of the No. 39 slot, two adjacent and reversely bent conventional ends 13 in the sixth flat wire conductor 3 and the seventh flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the first winding layer, the eighth flat wire conductor 3 is a first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the first layer 35 of the No. 45 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the second layer 36 of the No. 3 slot, the conventional end 13 corresponding to the straight line part 9 in the second layer 36 of the No. 3 slot is a connecting end of the U-phase first branch in the first winding layer, and the seventh flat wire conductor 3 and the eighth flat wire conductor 3 are connected by welding at the free end 5 by two adjacent and reversely bent conventional ends 13, so that the connection of the U-phase first branch between the seventh flat wire conductor 3 and the eighth flat wire conductor 3 in the first winding layer is completed; to this end, the connection of the U-phase one-branch in the flat wire conductor 3 in the first winding layer is completed.

Further, the U-phase first branch is wound in the second winding layer for the first circle, the first flat wire conductor 3 in the second winding layer is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 is located in the third layer 37 of the slot No. 9, the straight line part 9 corresponding to the other conventional end 13 is located in the fourth layer 38 of the slot No. 15, the conventional end 13 corresponding to the straight line part 9 in the third layer 37 of the slot No. 9 is the connecting end of the U-phase first branch in the second winding layer, the connecting end of the U-phase first branch in the first winding layer is welded with the connecting end of the U-phase first branch in the second winding layer at the free end 5, and the connection of the U-phase first branch and the U-phase first branch in the second winding layer is completed;

in the second winding layer, the second flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the second flat wire conductor is positioned in the third layer 37 of the No. 21 slot, the straight line part 9 corresponding to the other conventional end 13 of the second flat wire conductor is positioned in the fourth layer 38 of the No. 27 slot, two adjacent and reversely bent conventional ends 13 in the first flat wire conductor 3 and the second flat wire conductor 3 are welded and connected at the free end 5, and the connection of the first flat wire conductor 3 and the second flat wire conductor 3 in the second winding layer of the U-phase first branch is completed;

in the second winding layer, the third flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the third layer 37 of the No. 33 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the fourth layer 38 of the No. 39 slot, two adjacent and reversely bent conventional ends 13 in the second flat wire conductor 3 and the third flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the second winding layer, the fourth flat wire conductor 3 is the second flat wire conductor 16, the straight line part 9 corresponding to the regular end 13 of the second flat wire conductor is positioned in the third layer 37 of the No. 45 slot, the straight line part 9 corresponding to the short span end 14 of the second flat wire conductor is positioned in the fourth layer 38 of the No. 3 slot, the regular end 13 bent clockwise of the fourth flat wire conductor 3 and the regular end 13 adjacent to the regular end 13 of the fourth flat wire conductor 3 and bent counterclockwise in the third flat wire conductor 3 are welded and connected at the free end 5, and the connection of the third flat wire conductor 3 and the fourth flat wire conductor 3 in the second winding layer of the U-phase first branch is completed.

Then, a U-phase first branch is wound in a second winding layer for a second circle, a fifth flat wire conductor 3 in the second winding layer is a second flat wire conductor 16, a straight line part 9 corresponding to a short span end 14 of the second flat wire conductor is positioned in a third layer 37 of the No. 8 slot, a straight line part 9 corresponding to a conventional end 13 of the second flat wire conductor is positioned in a fourth layer 38 of the No. 14 slot, a fifth flat wire conductor 3 and a fourth flat wire conductor 3 are two adjacent flat wire conductors 3 between the first circle and the second circle, 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 connected in a welding mode at a free end 5, and the connection of the U-phase first branch between the first circle and the second circle in the second winding layer is completed;

in the second winding layer, the sixth flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the third layer 37 of the No. 20 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the fourth layer 38 of the No. 26 slot, the conventional end 13 bent anticlockwise of the fifth flat wire conductor 3 and the conventional end 13 adjacent to the conventional end 13 of the fifth flat wire conductor 3 and bent clockwise of the sixth flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the second winding layer, the seventh flat wire conductor 3 is the first flat wire conductor 15, the straight line part 9 corresponding to one conventional end 13 of the first flat wire conductor is positioned in the third layer 37 of the No. 32 slot, the straight line part 9 corresponding to the other conventional end 13 is positioned in the fourth layer 38 of the No. 38 slot, two adjacent and reversely bent conventional ends 13 in the sixth flat wire conductor 3 and the seventh flat wire conductor 3 are welded and connected at the free end 5, and 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 first branch is completed;

in the second winding layer, the eighth flat wire conductor 3 is a third flat wire conductor 17, the straight line part 9 corresponding to the conventional end 13 of the eighth flat wire conductor is positioned in the third layer 37 of the No. 44 slot, the straight line part 9 corresponding to the neutral point end 12 of the eighth flat wire conductor is positioned in the fourth layer 38 of the No. 2 slot, the neutral point end 12 of the eighth flat wire conductor is a U-phase branch neutral point 24, the conventional end 13 of the eighth flat wire conductor 3 bent clockwise and the conventional end 13 of the seventh flat wire conductor 3 adjacent to the conventional end 13 of the eighth flat wire conductor 3 and bent counterclockwise are connected by welding at the free end 5, and the connection of the seventh flat wire conductor 3 and the eighth flat wire conductor 3 in the second winding layer of the U-phase first branch is completed; to this end, the connection of the flat wire conductor 3 of the U-phase one branch in the second winding layer is completed.

According to the arrangement mode of the U-phase first branch, the U-phase second branch firstly winds a first circle and a second circle in a second winding layer respectively, and then winds the first circle and the second circle in the first winding layer respectively;

firstly, the first flat wire conductor 3 of the U-phase second branch in the second winding layer is the fourth flat wire conductor 18, the straight line part 9 corresponding to the outlet end 11 is located in the fourth layer 38 of the 44-numbered slot, the straight line part 9 corresponding to the conventional end 13 is located in the third layer 37 of the 38-numbered slot, and the outlet end 11 is the U-phase second branch outlet 25;

then, the arrangement mode of the U-phase two-branch is that the arrangement direction is opposite to that of the U-phase one-branch, the connection mode is the same as that of the U-phase one-branch, and the specific position of each flat wire conductor 3 is as follows:

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

a U-phase two branch in a second turn of the second winding layer: the fifth flat wire conductor 3 is a second flat wire conductor 16, and the two corresponding straight line parts 9 are respectively positioned in the fourth layer 38 of the No. 45 slot and the third layer 37 of the No. 39 slot; the sixth flat wire conductor 3 is the first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the fourth layer 38 of the No. 33 slot and the third layer 37 of the No. 27 slot; the seventh flat wire conductor 3 is the first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the fourth layer 38 of the No. 21 slot and the third layer 37 of the No. 15 slot; the eighth flat wire conductor 3 is the first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the fourth layer 38 of the No. 9 slot and the third layer 37 of the No. 3 slot;

a U-phase two branch in the first turn of the first winding layer: the first flat wire conductor 3 is a first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 45 slot and the first layer 35 of the No. 39 slot; the second flat wire conductor 3 is a first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 33 slot and the first layer 35 of the No. 27 slot; the third flat wire conductor 3 is a first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 21 slot and the first layer 35 of the No. 15 slot; the fourth flat wire conductor 3 is a second flat wire conductor 16, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 9 slot and the first layer 35 of the No. 3 slot;

a U-phase two branch in a second turn of the first winding layer: the fifth flat wire conductor 3 is a second flat wire conductor 16, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 46 slot and the first layer 35 of the No. 40 slot; the sixth flat wire conductor 3 is a first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned in the second layer 36 of the No. 34 slot and the first layer 35 of the No. 28 slot; the seventh flat wire conductor 3 is a first flat wire conductor 15, and the two corresponding straight line parts 9 are respectively positioned 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 in the second turn of the first winding layer is the third flat wire conductor 17, the straight line portion 9 corresponding to its regular end 13 is located in the second layer 36 of slot No. 10, 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 U-phase second branch neutral point 26.

As shown in fig. 16, the V-phase winding and the W-phase winding are arranged in the arrangement of the U-phase winding, wherein: the V-phase one-branch lead-out line 27 is located in the first layer 35 of No. 14 slot, the V-phase one-branch neutral point 28 is located in the fourth layer 38 of No. 6 slot, the V-phase two-branch lead-out line 29 is located in the fourth layer 38 of No. 48 slot, the V-phase two-branch neutral point 30 is located in the first layer 35 of No. 8 slot, the W-phase one-branch lead-out line 31 is located in the first layer 35 of No. 18 slot, the W-phase one-branch neutral point 32 is located in the fourth layer 38 of No. 10 slot, the W-phase two-branch lead-out line 33 is located in the fourth layer 38 of No. 4 slot, and the W-phase two-branch neutral point 34 is located in the first layer 35.

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

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

As shown in fig. 14, the copper ring 19 is a circular arc flat sheet, six welding holes 22 are formed 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 7, the stator slots 6 of the stator core 2 are rectangular.

Preferably, as shown in fig. 1 and 3, the stator core 2 is formed with weld grooves 20 and key grooves 21 on the outer circumference thereof.

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

Other embodiments and structural variations of the present invention are described below:

1. in the above embodiment, the U-phase second branch is arranged from the second winding layer, and may also be arranged from the first winding layer, that is, from the U-phase second branch neutral point 26 to the U-phase second branch lead-out line 25, and other arrangement sequences with the same final arrangement result 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 a U-phase winding, a V-phase winding, and a W-phase winding, where each phase winding is connected in parallel with two branches, or each phase winding may be connected in a single path, that is: the original U-phase one-branch neutral point 24 is connected to the original U-phase two-branch outgoing line 25, the original U-phase one-branch outgoing line 23 is used as a new U-phase outgoing line, the original U-phase two-branch neutral point 26 is used as a new U-phase neutral point, the original V-phase one-branch neutral point 28 is connected to the original V-phase two-branch outgoing line 29, the original V-phase one-branch outgoing line 27 is used as a new V-phase outgoing line, the original V-phase two-branch neutral point 30 is used as a new V-phase neutral point, the original W-phase one-branch neutral point 32 is connected to the original W-phase two-branch outgoing line 33, the original W-phase one-branch outgoing line 31 is used as a new W-phase outgoing line, the original W-phase two-branch neutral point 34 is used as a new W-phase neutral point, as long as the arrangement structure in which 32 flat conductors 3 are arranged in each phase winding in the three-phase flat-wire stator of the 8-pole 48 slot motor in the manner of the, as would be understood and accepted by those skilled in the art.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention. The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims (8)

1. A novel stator of a flat wire motor is defined, 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, and the winding consists of a plurality of flat wire conductors (3), wherein:

one axial end of the stator (1) is a bending end (4), and the other axial end of the stator is a free end (5);

the section of the stator core (2) is circular, z axially-through stator slots (6) are uniformly formed in the inner wall of the stator core (2) along the circumferential direction, openings of the stator slots (6) face the axis of the stator core (2), and z =12p is met;

the winding is a three-phase winding (7) in star connection, 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, the bent shape of the flat wire conductor (3) is hairpin-shaped, each flat wire conductor (3) consists of a bent part (8), two straight line parts (9) and two back bent parts (10), wherein the bending part (8) is formed by bending a flat wire at the middle position to form an included angle part of the hairpin-shaped flat wire conductor (3), the two rear bending parts (10) are formed by bending the head and the tail ends of the flat wire in opposite directions to form open support legs at two sides of an opening of the hairpin-shaped flat wire conductor (3), the two straight line parts (9) are parallel to each other in the flat wire conductor (3), one end of each of the two straight line parts (9) is connected with the bending part (8), and the other end of each of the two straight line parts is connected with the rear bending part (10) to form straight sections on two sides of the hairpin-shaped flat wire conductor (3);

in the installation state, in each flat wire conductor (3), straight line parts (9) are all arranged in a stator slot (6) along the axial direction of a stator iron core (2), bent parts (8) are all arranged at a bent end (4) of a stator (1), rear bent parts are all arranged at a free end (5) of the stator (1), when viewed towards the end face of the free end (5) of the stator (1), one rear bent part (10) is clockwise bent towards the end face by taking the straight line part (9) connected with the rear bent part as a reference, the other rear bent part (10) is anticlockwise bent towards the end face by taking the connected straight line part (9) as a reference, wherein the rear bent part (10) which is clockwise bent is welded and connected with the rear bent part (10) which is anticlockwise bent of an adjacent flat wire conductor (3), and the rear bent part (10) which is anticlockwise bent is clockwise bent is connected with the other adjacent flat wire conductor (3) The back bending parts (10) are welded and connected to form each phase winding in a connection mode, and each phase winding is sequentially arranged in the stator slots (6) in a surrounding and penetrating mode along the circumferential direction of the stator core (2);

the method is characterized in that:

the stator (1) is observed from a cross section angle, the section of a straight line part (9) of each flat wire conductor (3) forms a multilayer structure in a stator slot (6) from outside to inside along the radial direction of a stator iron core (2), the number of layers is sequenced from outside to inside in the radial direction of the stator iron core (2) to a first layer (35), a second layer (36), a third layer (37), a fourth layer (38) to a 4n layer, 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 the like;

in the three-phase winding (7), each phase winding is arranged in a first winding layer along the circumferential direction for two circles to form a first circle of the first winding layer and a second circle of the first winding layer, and then the phase windings are arranged in a second winding layer along the circumferential direction for two circles to form a first circle of the second winding layer and a second circle of the second winding layer, so that the phase windings are circularly arranged 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:

two straight line parts (9) in each flat wire conductor (3) are positioned in two different stator slots (6), and the two different stator slots (6) are spaced by z/2p stator slots (6) in the circumferential direction, and the two straight line parts (9) are positioned in different layers of the same winding layer;

in each winding layer, two adjacent straight line parts (9) in two adjacent flat wire conductors (3) in the same circle are positioned 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 line parts (9) are positioned in different layers of the same winding layer;

in each winding layer, two adjacent straight line parts (9) of two adjacent flat wire conductors (3) positioned between the first circle and the second circle are positioned in two different stator slots (6), and the two different stator slots (6) are spaced from each other by z/2p-1 stator slots (6) in the circumferential direction, and the two straight line parts (9) are positioned in different layers of the same winding layer;

two adjacent straight portions (9) of 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 z/2p stator slots (6) apart in the circumferential direction, while the two straight portions (9) are located in adjacent layers.

2. The stator of claim 1, wherein: the back bending part (10) of the flat wire conductor (3) is different according to the unfolding length and sequentially comprises the following parts from long to short: an outlet terminal (11), a neutral point terminal (12), a normal terminal (13) and a short span terminal (14), and the flat wire conductor (3) composed of them is classified into:

a first flat wire conductor (15) of which both rear bent portions (10) are conventional ends (13);

a second flat wire conductor (16) of which one back-bent part (10) is a conventional end (13) and the other back-bent part (10) is a short span end (14);

a third flat wire conductor (17), one back-bent part (10) of which is a conventional end (13), and the other back-bent part (10) of which is a neutral point end (12);

a fourth flat wire conductor (18), one back bending part (10) of which is a conventional end (13), and the other back bending part (10) of which is an outlet end (11);

the second flat wire conductors (16) correspond to two adjacent flat wire conductors (3) between the first ring and the second ring in each winding layer, the straight line parts (9) corresponding to two adjacent short span ends (14) of the two adjacent second flat wire conductors (16) are positioned in two different stator slots (6), the two different stator slots (6) are spaced from each other by z/2p < -1 > stator slots (6) in the circumferential direction, and the two straight line parts (9) are positioned in different layers of the same winding layer;

the third flat wire conductor (17) is used as a connection wire at a neutral point in a star connection structure of the three-phase windings (7), and the neutral point end (12) corresponds to a neutral point of the three-phase windings (7);

the fourth flat wire conductor (18) is used as a connection wire at an outgoing line in a star-connected structure of the three-phase winding (7), and the outgoing line end (11) corresponds to the outgoing line of the three-phase winding (7);

the first flat wire conductor (15) acts on the remaining part of the three-phase winding (7).

3. The stator of claim 2, wherein: in the three-phase winding (7), the outlet end (11) of the fourth flat wire conductor (18) of each phase is connected with the free end (5) in a welding mode, and the neutral point end (12) of the third flat wire conductor (17) of each phase is connected with the free end (5) through a copper ring (19).

4. A stator according to claim 3, wherein: the copper ring (19) is an arc-shaped flat sheet, a welding hole (22) is formed in the copper ring, and all the neutral point ends (12) are welded in the welding hole (22).

5. The stator of claim 1, wherein: the distance between two straight line parts (9) of the flat wire conductor (3) of the three-phase winding (7) in different winding layers is different, the distance between the two straight line parts of the flat wire conductor (3) of the first winding layer is larger than the distance between the two straight line parts (9) of the flat wire conductor (3) of the second winding layer, and so on.

6. The stator of claim 1, wherein: the stator slots (6) of the stator core (2) are rectangular.

7. The stator of claim 1, wherein: the stator core (2) is provided with a weld groove (20) and a key groove (21) on the outer circle thereof.

8. A stator according to claim 3, wherein: the part of the flat wire conductor (3) at the free end (5) and the copper ring (19) are coated with a layer of insulating powder.

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