CN112953047A

CN112953047A - Novel flat copper wire oil-cooled motor stator with stepped chute and motor

Info

Publication number: CN112953047A
Application number: CN202110119423.5A
Authority: CN
Inventors: 李良梓; 陈静; 牛铭奎; 李了了; 高志川
Original assignee: ZHEJIANG FOUNDER MOTOR CO Ltd
Current assignee: ZHEJIANG FOUNDER MOTOR CO Ltd
Priority date: 2021-01-28
Filing date: 2021-01-28
Publication date: 2021-06-11
Anticipated expiration: 2041-01-28
Also published as: CN112953047B

Abstract

The invention relates to a novel stepped chute flat copper wire oil-cooled motor stator and a motor, which comprise a stator core block and flat wire conductors arranged in the stator core block, wherein a plurality of grooves are formed in the stator core block along the circumference, the grooves are in a stepped shape along the radial direction, a plurality of layers of flat wire conductors are arranged in each groove, the grooves are an anticlockwise stepped chute and a clockwise stepped chute, and the anticlockwise stepped chute and the clockwise stepped chute are alternately arranged at intervals. According to the process characteristics that a single flat wire conductor is easy to be directly inserted into a slot and the like, the winding of the equivalent skewed slot is realized through the special layered design of the stator core block slot, and the purpose of effectively weakening harmonic waves is achieved; the special punching sheet structure and the winding design can effectively reduce the proximity effect between conductors, thereby improving the performance of the motor.

Description

Novel flat copper wire oil-cooled motor stator with stepped chute and motor

Technical Field

The invention relates to the technical field of permanent magnet synchronous driving motors for new energy automobiles, in particular to a flat copper wire oil-cooled motor stator and a motor with a novel stepped chute.

Background

The new energy automobile requires high motor rotation speed and large torque to meet good starting or climbing capacity and high speed; on the other hand, the motor must have high torque and power density due to the limited space and weight requirements of the passenger car. The permanent magnet synchronous motor is widely applied to new energy automobiles due to good speed regulation capacity and high torque density. In recent years, with continuous iteration of electric driving technology of new energy automobiles, the requirements on the maximum rotating speed and the torque power density of a motor are increased more and more, but the problems of high temperature, difficult heat dissipation and the like of the motor are brought along.

The current common methods for reducing the temperature rise of the motor are mainly divided into two types: reduce the loss of the motor or improve the heat dissipation capacity of the motor. The reduction of the motor loss is mainly realized by optimizing the electromagnetic design of the motor, such as selecting a silicon steel sheet with lower iron loss, increasing the copper consumption, optimizing the stator and rotor structure, reducing the harmonic content and the like; the improvement of the heat dissipation capacity of the motor mainly optimizes the cooling mode of the motor, generally, the cooling mode heat dissipation capacity is from high to low: water cooling + oil cooling > water cooling > air cooling.

At present, new energy motor manufacturers actively lay out and develop a stator flat copper wire winding technology, and the technology can better improve the temperature of the motor stator side. However, the speed increase is one of the current development trends, and due to the alternating current effect, the flat copper wire generates a large alternating current loss when operating at a high-speed section, and the advantage of low stator temperature rise gradually disappears, so that the problem of temperature rise of the stator and the rotor of the flat wire motor at the high-speed section is particularly important to reduce.

For example, patent CN207801593U discloses a stator design of a flat copper wire motor, which breaks through the conventional parallel slot concept, and designs the corresponding conductor width according to the different depths of the slots, so as to achieve the effect of reducing the overall resistance; this patent is because the conductor size of groove root has increased, and the size of conductor has changed, can't reach the effect of equivalent chute, and the tip line is more complicated difficult, has increased technology degree of difficulty among the intangible and has called the cost.

For another example, patent CN103296824A discloses an oil cooling system for an automobile driving motor, in which an axial oil passage is designed through a housing to cool a stator, and a special oil pipe and an oil nozzle are branched from the axial oil passage to directly cool an iron core; the design can cool the stator core and the winding end part to a certain degree, but cannot ensure the uniformity of the local cooling effect of the whole motor, and relates to a spraying system, so that the cooling structure is complex;

also, patent CN110808645A discloses an oil cooling structure in the stator core of a flat wire motor, which is characterized in that an opening is formed at the upper end of the tooth top of the stator, an oil passage is formed by an end cover plate, and oil is allowed to enter the core for direct cooling after the oil passage is attached; this design has a cooling effect on the in-winding conductor near the slot bottom, but the ac resistance of the conductor near the slot bottom is high, and this patent has a limited cooling effect on the in-slot winding near the slot bottom, and even if the cooling effect of the slot bottom conductor is to be enhanced, the core opening needs to be enlarged, and the enlargement of the opening affects the main magnetic path to some extent, resulting in a decrease in the torque performance of the motor.

In addition, when the flat copper wire scheme is adopted for the new energy driving motor at present, the winding end part generally adopts a mode that one end is used for clamping a wire and the other end is used for welding or both ends are used for welding, an independent process link cannot be formed in the whole stator assembly production process, the requirement on production line equipment is high, the whole process relates to a series of continuous and complex processes such as wire insertion, head twisting, head cutting, bending and welding, and the efficiency and the yield are easily influenced; therefore, how to reduce the temperature rise of the stator and the rotor of the flat wire motor at a high-speed section, simplify the production process of the flat wire motor, and improve the performance and the yield of the flat wire motor becomes the problem which needs to be solved urgently by technical personnel in the field.

Disclosure of Invention

In order to solve the technical problems, a first object of the invention is to provide a flat copper wire oil-cooled motor stator of a novel stepped chute, the stator structure can reduce harmonic content, and further reduce motor temperature rise, and a second object of the invention is to provide a flat copper wire oil-cooled motor of a novel stepped chute.

In order to achieve the above object of the first invention, the invention adopts the following technical solutions:

the utility model provides a novel flat copper line oil-cooled motor stator of ladder chute, includes stator iron core piece to and set up the flat line conductor in stator iron core piece, be equipped with a plurality of grooves along the circumference on the stator iron core piece, the groove is along radially becoming the echelonment, and every inslot all is equipped with multilayer flat line conductor, the groove is anticlockwise ladder chute and clockwise ladder chute, and anticlockwise ladder chute and clockwise ladder chute interval setting in turn.

Preferably, a cooling hole is further formed between the counterclockwise stepped chute and the clockwise stepped chute.

Preferably, the cooling holes are arranged at a position where a gap between the two grooves is larger, a circle of first cooling holes close to the outer ring and a circle of second cooling holes close to the inner ring are formed, and the first cooling holes and the second cooling holes are alternately arranged along the circumferential direction.

Preferably, one end of the stator core block is further provided with a front end integrated module, the front end integrated module comprises a front end insulator, an end winding conductor, a lead-out wire conductor and a neutral point connecting conductor, one end face of the front end insulator is provided with a conductor connecting port for being connected with a flat wire conductor in an inserting mode, the conductor connecting port is matched with the shape of a groove in the stator core block, the end winding conductor, the lead-out wire conductor and the neutral point connecting conductor are all embedded in the front end insulator and extend to the conductor connecting port, and the lead-out wire conductor penetrates out of the other end face of the front end insulator.

Preferably, the end-winding conductor, the outgoing-line conductor and the neutral-point connecting conductor each include a forked connecting conductor and a strip-shaped connecting conductor connecting the plurality of forked connecting conductors, and the forked connecting conductors extend to the conductor connection openings.

Preferably, the front end insulator is further provided with a first cooling channel and a second cooling channel, and the first cooling channel and the second cooling channel are located at the same positions as the first cooling hole and the second cooling hole in the stator core block and are communicated with each other through a connecting pipe.

Preferably, an end face cooling cavity is further arranged on one side of the front end portion insulator, a channel isolation rib is arranged in the end face cooling cavity, the channel isolation rib divides the end face cooling cavity into two annular channels, one annular channel is communicated with all the first cooling channels, and the other annular channel is communicated with all the second cooling channels.

Preferably, the other end of the stator core block is further provided with a rear end integrated module, the rear end integrated module includes a rear end insulator and an end winding conductor, one end surface of the rear end insulator is also provided with a conductor connection port for connecting with the flat wire conductor, the conductor connection port is matched with the shape of the slot on the stator core block, and the end winding conductor is embedded in the rear end insulator and extends to the conductor connection port.

Preferably, the rear end insulator is provided with a third cooling passage and a fourth cooling passage, the third cooling passage and the fourth cooling passage respectively corresponding to the first cooling hole and the second cooling hole.

In order to achieve the above object of the second invention, the invention adopts the following technical scheme:

the motor comprises a motor shaft, a rotor and a stator, wherein the stator adopts any one of the flat copper wire oil-cooled motor stator with the novel stepped chute.

Compared with the prior art, the invention has the beneficial effects that:

according to the process characteristics that a single flat wire conductor is easy to be directly inserted into a slot and the like, the winding of the equivalent skewed slot is realized through the special layered design of the stator core block slot, and the purpose of effectively weakening harmonic waves is achieved; meanwhile, due to the fact that conductors of the traditional flat copper wire full-pitch winding and punching sheet are closely adjacent, the proximity effect cannot be ignored, the alternating current resistance is obviously increased in certain working condition areas, particularly high-speed areas, efficiency is reduced, and temperature rise is serious.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.

FIG. 1 is a schematic view of the overall structure of one angle of the stator of the present invention;

FIG. 2 is a schematic view of another angular overall configuration of the stator of the present invention;

FIG. 3 is an exploded view of the stator of the present invention;

FIG. 4 is a schematic view of the stator core block and flat wire conductor mounting structure of the present invention;

FIG. 5 is a schematic end view of a stator core block of the present invention;

FIG. 6 is an enlarged view of part A of FIG. 5;

FIG. 7 is a schematic view of various shapes of cooling holes of the present invention;

FIG. 8 is an exploded view of the front end integrated module of the present invention;

FIG. 9 is a schematic view of the front end insulator of the present invention;

FIG. 10 is a side view of the front end insulator of the present invention;

FIGS. 11-14 are cross-sectional views A-A, B-B, C-C and D-D, respectively, of FIG. 10;

fig. 15 is a schematic structural view of an end-winding conductor, a lead-out wire conductor and a neutral point connecting conductor of the present invention;

FIGS. 16-18 are schematic views of three different sets of flat wire conductors and end-winding conductors in accordance with the present invention;

FIGS. 19-22 are schematic views of four end-turn conductors of the present invention;

FIG. 23 is a schematic diagram of the connection of the U-phase or W-phase branch of the present invention;

fig. 24 is a schematic diagram of a U-phase or W-phase branch outgoing line conductor structure according to the present invention;

FIG. 25 is a schematic view of the V-phase leg connection of the present invention;

fig. 26 is a schematic view of the structure of the V-phase branch outgoing line conductor of the present invention;

FIG. 27 is a schematic view of a neutral connection according to the present invention;

FIG. 28 is a schematic view of a neutral conductor connection configuration of the present invention;

FIG. 29 is an exploded view of the rear end integrated module of the present invention;

FIG. 30 is a schematic view of the assembled structure of the rear end insulator, the end winding conductor, the first connecting tube and the second connecting tube according to the present invention;

FIG. 31 is a side view of the rear end insulator of the present invention;

FIG. 32 is a schematic structural view of the rear end insulator of the present invention;

FIGS. 33-36 are cross-sectional views A-A, B-B, C-C and D-D, respectively, of FIG. 31;

FIG. 37 is one of the schematic end winding electrical connections and lead-out wires of the present invention;

figure 38 is a second schematic of the end winding electrical connections and lead-out wires of the present invention.

The reference numbers in the figures are: 2. a front end integration module; 3. a rear end integration module; 4. a screw; 5. a nut; 6. an oil inlet and an oil outlet; 7. a three-phase outgoing line copper bar; 8. a stator core block; 9. a counter-clockwise stepped chute; 10. a clockwise stepped chute; 11. a first cooling hole; 12. a second cooling hole; 13. a first screw fixing hole; 14. a flat wire conductor; 15. a front end insulator; 16. a first connecting pipe; 17. a second connecting pipe; 18. a second screw fixing hole; 19. a conductor connection port; 20. an end face cover plate; 21. an inner side plate; 22. a channel isolation rib; 23. an outer panel; 24. a first channel; 25. a second cooling channel; 26. an inlet and an outlet of the cooling channel; 27. a first channel; 30. a second channel; 31. a third channel; 32. a fourth channel; 34. a first end winding conductor; 35. a second end winding conductor; 36. a third end winding conductor; 37. a fourth end winding conductor; 38. a forked connection conductor; 39. a first outgoing line conductor; 40. a second outgoing line conductor; 41. a neutral point connection conductor; 42. a rear end insulator; 43. the axial end cools the cavity.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, elements, and/or combinations thereof, unless the context clearly indicates otherwise.

Further, in the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The invention will be further illustrated with reference to the following examples and drawings:

as shown in fig. 1 to fig. 3, the flat copper wire oil-cooled motor stator of the novel stepped chute comprises a stator core block 8, a front end part integrated module 2 and a rear end part integrated module 3 which are arranged at two ends of the stator core block 8, wherein a circle of first screw fixing holes 13 are formed in the stator core block 8, a circle of second screw fixing holes 18 are formed in the front end part integrated module 2 and the rear end part integrated module 3 respectively, and screws 4 sequentially penetrate through the second screw fixing holes 18 in the front end part integrated module 2, the first screw fixing holes 13 in the stator core block 8 and the second screw fixing holes 18 in the rear end part integrated module 3 and are in threaded connection with nuts 5 to fasten the stator core block, the stator core block and the stator core block.

The stator core block 8 is circumferentially provided with a plurality of grooves which are stepped along the radial direction, and each groove is internally provided with a plurality of layers of flat wire conductors 14. The stator core block 8 is formed by tightly laminating a plurality of stator core punching sheets, and the length of the flat wire conductor 14 is greater than the axial length of the stator core block 8. The flat wire conductor 14 is designed linearly, the inside of the groove contains an insulating layer, and insulating skins at two ends are in a stripping state, so that the flat wire conductor can have a better rated conduction effect after being conveniently connected with a front end part integrated module or a rear end part integrated module.

By adopting the fixing mode of screws and nuts, the loose connection between the flat wire conductor and the conductors in the front end part integrated module 2 and the rear end part integrated module 3 can be avoided, the stator core punching sheets can be axially and tightly stacked together, the stator core welding process is omitted, and the eddy current loss of the stator core is reduced.

The conductors are N layers, the number of the steps of the grooves is M, N is larger than or equal to M and larger than or equal to 2, and N and M are both natural numbers. A plurality of grooves are arranged at equal intervals, and the grooves are all counterclockwise step chutes 9 or clockwise step chutes 10. That is, the whole stator core block 8 is completely provided with the anticlockwise stepped chute 9 or the clockwise stepped chute 10, similar to the rotor segmented oblique pole principle, and the purpose of reducing the motor harmonic wave can be realized through reasonable stepped angle design.

In this embodiment, a three-phase 48-slot 8-pole motor, 8 layers of windings, 4-way parallel connection and star connection are adopted, as shown in fig. 4 to 6, the number of conductors in each slot is 8, and the number of steps is also 8. The grooves in this embodiment include 2 types, one type is a clockwise stepped chute 10, the other type is an anticlockwise stepped chute 9, and the anticlockwise stepped chute 9 and the clockwise stepped chute 10 are alternately arranged at intervals. The adjacent counterclockwise step chutes 9 and clockwise step chutes 10 are diametrically symmetrically arranged. The counterclockwise stepped diagonal groove 9 is a groove stepped in the radial direction and inclined in the counterclockwise direction, and the clockwise stepped diagonal groove 10 is a groove stepped in the radial direction and inclined in the clockwise direction.

In the end connection manner of the flat wire conductors 14 in this embodiment, only one kind of flat wire conductor 14 in the groove shape is selected for any branch to be connected, and finally, two of the 4 branches in each phase are used for connecting the corresponding flat wire conductors in the corresponding counterclockwise stepped chutes 9 in series, and two of the 4 branches are used for connecting the corresponding flat wire conductors in the corresponding clockwise stepped chutes 9 in series, as shown in fig. 37 and 38, each branch includes 32 flat wire conductors after being connected in series, and is uniformly distributed in 8 grooves in the circumferential direction, and 8 layers of flat wire conductors equivalent to 4 same grooves after being connected in series are connected in series; because the conductors in the same groove have phase difference in the circumferential direction, higher harmonics can be counteracted to a certain extent after vector superposition; the number of times of the high-order harmonics is offset is related to the angle of the whole inclined groove, namely the circumferential included angle of the adjacent conductors can be designed according to the design state of the motor and the actual conditions such as the number of times of the harmonics which are wanted to be weakened.

In this embodiment, the number of the parallel branches may be designed according to actual needs, including but not limited to a polar pair of branches; in the embodiment, only 8 layers of conductors are taken as an example, but the method is also applicable to the design of 2 layers, 4 layers, 6 layers and multiple layers of flat wires, and the included angle of adjacent layers can be designed specifically according to the number of layers; meanwhile, for N layers of conductors, if the conductors are designed by 2-N/2 stepped chutes, the design is also within the protection range of the application; in the embodiment, the size of each layer of conductor is the same, but the method is also suitable for the design with different sizes of each layer of conductor; in the embodiment, the width of each stepped chute is the same, but the design is also suitable for different stepped chutes; the stator core punching sheet in the embodiment is designed in a way that adjacent slots are radially symmetrical, but is also suitable for asymmetrical design; the groove schematic diagram on the stator iron core block in the embodiment is not designed with an opening, and is also designed with an opening for the groove; the present embodiment is an inner rotor structure motor, but the present invention is also applicable to an outer rotor motor.

A cooling hole is further provided between the counterclockwise step shoot 9 and the clockwise step shoot 10 in this embodiment. The cooling holes are arranged at the position with a larger gap between the two grooves, a circle of first cooling holes 11 close to the outer ring and a circle of second cooling holes 12 close to the inner ring are formed, and the first cooling holes 11 and the second cooling holes 12 are alternately arranged along the circumferential direction. As shown in fig. 7, the cooling holes may also be triangular, rectangular, trapezoidal, diamond-shaped, pentagonal, circular, oval, or a plurality of small holes matching with each other.

The stator core block is designed to provide a main magnetic line path, and comprises teeth and a yoke, according to the basic principle of a magnetic circuit of a permanent magnet motor, the main magnetic flux of a motor air gap enters from a stator tooth shoulder, enters the yoke through a tooth top, enters the tooth shoulder through tooth tops of other teeth, returns to an air gap and a rotor, and forms a closed loop. Any narrow design in the path will affect the saturation state of the main magnetic circuit of the motor. In the illustration of the embodiment, the counterclockwise stepped skew slot 9 and the clockwise stepped skew slot 10 are radially symmetrical, and 8 flat wire conductors 14 are inserted into each slot; stator teeth with trapezoidal outlines are formed between two adjacent oblique grooves; because the stepped groove diameters are in mirror symmetry, the trapezoidal teeth can be in a shape that the tooth shoulders are narrow, the tooth tops are wide, the tooth shoulders are wide, the tooth tops are narrow, and the tooth shoulders and the tooth tops are crossed; in the place where the trapezoidal teeth are relatively wide, a first cooling hole 11 and a second cooling hole 12 are dug to provide a cooling liquid channel for directly cooling the stator core block, and the cooling holes are formed in the upper part and the lower part of the alternate teeth, so that the heat of conductors at the bottom and the notch of the groove can be taken away, and the main magnetic circuit of the motor cannot be blocked; in the present embodiment, cooling holes are formed on both the tooth tip and the tooth shoulder, and similar designs such as those formed only on the tooth tip or only on the tooth shoulder, or those formed at intervals are within the scope of the present application.

As shown in fig. 8 to 29, the front end integrated module 2 includes a front end insulator 15, an end winding conductor, a lead-out wire conductor, and a neutral point connection conductor 41, wherein a conductor connection port 19 for connecting with the flat wire conductor 14 is provided on one end surface of the front end insulator 15, the conductor connection port 19 matches the shape of the slot on the stator core block 8, the end winding conductor, the lead-out wire conductor, and the neutral point connection conductor 41 are embedded in the front end insulator 15 and extend to the conductor connection port 19, and the lead-out wire conductor passes through the other end surface of the front end insulator 15.

The end winding conductor, the outgoing line conductor and the neutral point connecting conductor 41 all comprise a fork-shaped connecting conductor 38 and strip-shaped connecting conductors for connecting the plurality of fork-shaped connecting conductors 38, the fork-shaped connecting conductors 38 extend to the conductor connecting ports 19 to be conveniently spliced and communicated with the flat wire conductors, the fork-shaped connecting conductors 38 are spliced with the flat wire conductors with insulation covers removed, and the flat wire conductors can be relatively and tightly connected through proper tolerance size design; the forked connectors 38 on the flat wire conductors 14 in the same groove are divided into two groups in a crossed mode, the two groups belong to different branches, the two groups are respectively connected with corresponding strip-shaped connecting conductors through left outgoing lines and right outgoing lines, and the axial heights of the two sides are consistent, so that the space is saved conveniently.

As shown in fig. 15 to 18, the strip-shaped connecting conductor is arc-shaped, the opening of the arc faces the axis, and the forked connecting conductor 38 is disposed outside the strip-shaped connecting conductor; or the opening of the circular arc is directed to the outside, and the forked connection conductor 38 is arranged on the inside of the strip-like connection conductor. The end winding conductor can be respectively led to the outer diameter side and the inner diameter side of the stator iron core block from the upper part of the end part of the flat wire conductor, so that the space at the upper end of the yoke part of the stator iron core and the space at the end part of the rotor iron core can be utilized, the winding end part of the whole motor can be reduced, the axial length of the whole motor can be correspondingly reduced, and the performance density of the motor in unit volume can be increased. Meanwhile, part of the strip-shaped connecting conductors are step-shaped, and the middle part of the strip-shaped connecting conductors is lower than the two ends of the strip-shaped connecting conductors, so that the requirement of avoiding wires is met, and the size is further reduced.

And a three-phase outgoing line copper bar 7 is further arranged on the outgoing line conductor, and the three-phase outgoing line copper bar 7 penetrates out of the insulator 15 at the front end part. The specific structure of the end winding conductor in this embodiment is mainly four, as shown in fig. 19 to 22, which are arc-shaped and step-shaped strip-shaped connecting conductors, and the opening of the arc is toward the first end winding conductor 34 of the shaft center; the conductor is connected in a circular arc strip shape, and the opening of the circular arc faces to the second end winding conductor 35 of the axis; a third end winding conductor 36 which is a strip-shaped connection conductor with a circular arc shape and a step shape, and the opening of the circular arc faces the outside; a fourth end winding conductor 37 having a circular arc-shaped strip-like connection conductor and having an opening facing outward; the four types of connecting lines can be locally lengthened or shortened according to the requirements of the cross slot and the avoiding line.

In the embodiment, a three-phase 48-slot 8-pole motor is adopted, 8 layers of windings are connected in parallel in 4 paths and are in star connection, so that 24 lines of 12 branches are led out from the front end of the end part of the winding, wherein 12 lines belong to neutral points and can be connected together, in addition, 12 lines are divided into A, B, C three phases, 4 lines of each phase are connected together, and finally, three large U, V, W leading-out lines are led out to serve as interfaces for electric control; the U-phase 4-branch or W-phase 4-branch lead wire forms a first lead wire conductor 39, and the V-phase 4-branch lead wire forms a second lead wire conductor 40; specific structures of the neutral point connecting conductor and the outgoing line conductor are shown in fig. 23 to 28.

In the present embodiment, as shown in fig. 37 and 38, the electrical schematic diagram of the end winding is only illustrated by connecting 4 branches of the U-phase, and the connection modes of the other branches are substantially the same; in this example, only such connection is taken as an example, and changing the winding to be short-distance connection, changing the number of branches, etc., if similar end connection wire types are still used, are all within the protection scope.

The end winding conductor, the outgoing line conductor, and the neutral point connecting conductor 41 in this embodiment may be produced independently, then welded, and then encapsulated integrally; copper water can also be directly injected into the insulating material, and the copper water forms an integral connecting framework along a designed space channel; the specific process is not within the scope of the present application, but the design and form presented by the end integrated module is within the scope of the present application.

In this embodiment, the sizes of the end winding conductor, the outgoing line conductor, and the neutral point connecting conductor 41 can be reduced as required, so that a larger and more flexible space can be provided, the amount of copper can be saved, and the cost can be reduced; the increase in resistance, which is caused by the reduction in size, and the resulting increase in heat, can be compensated for by the cooling structure of the end portion.

The specific cooling structure is as follows: the front end insulator 15 is further provided with an end axial cooling channel, and the position of the end axial cooling channel is the same as that of the cooling hole in the stator core block. The end axial cooling channels are arranged at the position with larger space between the two conductor connecting ports 19, a circle of first cooling channels 24 close to the outer ring and a circle of second cooling channels 25 close to the inner ring are formed, and the first cooling channels 24 and the second cooling channels 25 are alternately arranged along the circumferential direction. The first cooling channel 24 is in inserted connection with the first cooling hole 11 through the first connecting pipe 16; the second cooling channel 25 is in plug-in communication with the second cooling hole 12 through a second connecting pipe 17.

One side of front end portion insulator 15 still is equipped with terminal surface cooling cavity, be equipped with passageway isolation muscle 22 in the terminal surface cooling cavity, passageway isolation muscle 22 is wave line formula or broken line formula, passageway isolation muscle 22 separates terminal surface cooling cavity into two annular channel, and an annular channel communicates with all first cooling channel 24, and another annular channel communicates with all second cooling channel 25.

The end face cooling cavity comprises an end face cover plate 20, an inner side plate 21 and an outer side plate 23, the end face cover plate 20 is connected with the front end insulator 15 through the inner side plate 21 and the outer side plate 23, and covers the first cooling channel 24 and the second cooling channel 25, the end face cover plate 20 is further provided with two cooling channel inlets and outlets 26, and the two cooling channel inlets and outlets 26 are respectively provided with the oil inlet and outlet 6.

As shown in fig. 30 to 36, the other end of the stator core block 8 is further provided with a rear end integrated module 3, the rear end integrated module 3 includes a rear end insulator 42 and an end winding conductor, a conductor connection port 19 for connecting to the flat wire conductor 14 is also provided on one end surface of the rear end insulator 42, the conductor connection port 19 is matched with the shape of the slot in the stator core block 8, and the end winding conductor is embedded in the rear end insulator 42 and extends to the conductor connection port 19.

As shown in fig. 11 to 14, 33 to 36, a third channel 31 reserved for an end-winding conductor, a fourth channel 32 reserved for a forked connection conductor are provided in each of the front end insulator 15 and the rear end insulator 42; the front end insulator 15 is further provided with a first passage 27 reserved for a neutral point connection conductor and a second passage 30 reserved for a lead-out wire conductor.

Because the end connection of the flat copper wire winding is a difficult process point, the multilayer flat copper wires in the traditional design can be inserted and superposed in multiple layers at the end, the height of the end is large, the welding process of the end is complex, the production efficiency is low, and the cost is high; in this embodiment, the end winding conductor, the outgoing line conductor, and the neutral point connecting conductor 41 are all fixed together with the flat line conductor through the forked connecting conductor, that is, the front end integrated module and the rear end integrated module are directly buckled at both ends of the stator core block after being independently produced, which not only improves the production efficiency, but also avoids the insulation problem caused by the close overlapping of the ends, and similar forked connecting conductor designs and similar ways in which the two end integrated modules are directly buckled at both ends of the stator core block for connection are all within the protection range of this patent.

The rear end insulator 42 is provided with a third cooling passage corresponding to the position of the first cooling hole 11 and a fourth cooling passage corresponding to the position of the second cooling hole 12. The third cooling channel is in inserted connection with the first cooling hole 11 through a first connecting pipe 16, and the fourth cooling hole is in inserted connection with the second cooling hole 12 through a second connecting pipe 17.

The other end face of the rear end insulator 42 is further provided with a plurality of axial end cooling cavities 43, and each axial end cooling cavity 43 communicates two adjacent third cooling channels and fourth cooling channels. In other embodiments, the other end face of the rear end insulator 42 is further provided with an axial end cooling cavity 43, and the axial end cooling cavity 43 communicates all the third cooling channel and the fourth cooling channel.

In this embodiment, the cooling liquid is oil, the oil enters the annular channel close to the outer ring in the front end insulator after entering from the inlet of the front end insulator, the oil is respectively distributed into 24 first cooling channels 24, the first cooling channels 24 penetrate through the front end insulator, then enter the first cooling holes of the stator core block through the first connecting pipes, penetrate through the stator core block and then enter the third cooling channels of the rear end insulator through the first connecting pipes, each third cooling channel of the rear end insulator is independently sealed and respectively communicated with the adjacent fourth cooling channels, so that the oil returns to the second cooling hole of the stator core block again after passing through the rear end insulator and finally returns to the other cooling channel inlet/outlet 26 of the front end insulator to form a cooling loop; it is understood that the front end integrated module, the rear end integrated module, the end winding conductor, the outgoing line conductor, the neutral point connecting conductor 41, the flat wire conductor, and the stator core block can be cooled in the entire circuit.

In this embodiment, the cooling liquid is oil, and may be other cooling liquids; when the cooling liquid is water or cooling liquid with similar properties, a cooling channel can be added in the stator core block to prevent the cooling liquid from forming pressure and radially seeping out of the core; in this embodiment, the cooling liquid inlets and outlets are all designed on the front end integrated module, and similar designs are adopted, for example, the cooling liquid inlets and outlets are designed on the rear end integrated module, or both ends of the cooling liquid inlets and outlets are provided with cooling liquid inlets and outlets, or both the cooling liquid inlets and outlets are distributed at both ends, which are all within the protection scope of the present application; in this embodiment, the first connecting pipe and the second connecting pipe may be made of steel or plastic, and in this embodiment, if oil cooling is adopted, but a sealed cooling pipe design is not adopted, but spray cooling is performed by opening nozzles on a part of pipes, which also belongs to the protection scope of the present application.

In the embodiment, the structure of the end cooling structure and the end connecting line is an integrated body design, and similar designs such as a separated design or a design with one side separated and one side integrated are all within the protection scope of the application; similarly, the stator core block of this embodiment has both ends to be equipped with preceding tip collection moulding piece and back tip collection moulding piece respectively, and similar design is also in this application's protection scope if one end adopts the tip collection moulding piece, and the other end adopts traditional wiring structure.

The motor comprises a motor shaft, a rotor and a stator, wherein the stator adopts the flat copper wire oil-cooled motor stator with the novel stepped chute.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments without departing from the principle and spirit of the present invention, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention still fall within the technical scope of the present invention.

Claims

1. The utility model provides a novel flat copper line oil-cooled motor stator of ladder chute, a serial communication port, including stator iron core piece (8) to and flat conductor (14) of setting in stator iron core piece (8), be equipped with a plurality of grooves along the circumference on stator iron core piece (8), the groove is along radially becoming echelonment, and every inslot all is equipped with multilayer flat conductor (14), the groove is anticlockwise ladder chute (9) and clockwise ladder chute (10), and anticlockwise ladder chute (9) and clockwise ladder chute (10) interval setting in turn.

2. The flat copper wire oil-cooled motor stator of the novel stepped chute as claimed in claim 1, wherein a cooling hole is further arranged between the counterclockwise stepped chute (9) and the clockwise stepped chute (10).

3. The novel stepped chute flat copper wire oil-cooled motor stator is characterized in that the cooling holes are arranged at the position where the gap between the two grooves is larger, a circle of first cooling holes (11) close to the outer ring and a circle of second cooling holes (12) close to the inner ring are formed, and the first cooling holes (11) and the second cooling holes (12) are alternately arranged along the circumferential direction.

4. The flat copper wire oil-cooled motor stator of the novel stepped chute as claimed in claim 3, it is characterized in that one end of the stator iron core block is also provided with a front end part integrated module (2), the front end portion integrated module (2) includes a front end portion insulator (15), an end portion winding conductor, a lead-out wire conductor, and a neutral point connection conductor (41), a conductor connecting port (19) for being inserted with the flat wire conductor (14) is arranged on one side end face of the front end part insulator (15), the conductor connecting port (19) is matched with the shape of a groove on the stator iron core block (8), the end winding conductor, the outgoing line conductor and the neutral point connecting conductor (41) are all embedded in the front end insulator (15), and extends to a conductor connecting port (19), and the lead-out wire conductor penetrates out of the other end face of the front end part insulator (15).

5. The novel stepped-chute oil-cooled flat copper wire motor stator as claimed in claim 4, wherein the end winding conductor, the outgoing line conductor and the neutral point connecting conductor (41) each comprise a forked connecting conductor (38) and a strip-shaped connecting conductor connecting a plurality of forked connecting conductors (38), the forked connecting conductors (38) extending to the conductor connecting ports (19).

6. The novel stepped-chute oil-cooled flat copper wire motor stator is characterized in that a first cooling channel (24) and a second cooling channel (25) are further arranged on the front end insulator (15), and the positions of the first cooling channel (24) and the second cooling channel (25) are the same as the positions of a first cooling hole (11) and a second cooling hole (12) in a stator core block and are communicated through a connecting pipe.

7. The novel stepped chute flat copper wire oil-cooled motor stator is characterized in that an end face cooling cavity is further arranged on one side of the front end portion insulator (15), a channel isolation rib (22) is arranged in the end face cooling cavity, the channel isolation rib (22) divides the end face cooling cavity into two annular channels, one annular channel is communicated with all the first cooling channels (24), and the other annular channel is communicated with all the second cooling channels (25).

8. The novel stepped-chute flat copper wire oil-cooled motor stator is characterized in that a rear end integrated module (3) is further arranged at the other end of the stator core block (8), the rear end integrated module (3) comprises a rear end insulator (42) and an end winding conductor, a conductor connecting port (19) used for being connected with a flat wire conductor (14) is also formed in one side end face of the rear end insulator (42), the conductor connecting port (19) is matched with the shape of a groove in the stator core block (8), and the end winding conductor is buried in the rear end insulator (42) and extends to the conductor connecting port (19).

9. The novel stepped-chute oil-cooled flat copper wire motor stator as claimed in claim 8, wherein the rear end insulator (42) is provided with a third cooling channel corresponding to the position of the first cooling hole (11) and a fourth cooling channel corresponding to the position of the second cooling hole (12), respectively.

10. The utility model provides a motor, includes motor shaft, rotor and stator, its characterized in that: the stator adopts the flat copper wire oil-cooled motor stator with the novel step chute as claimed in any one of claims 1 to 9.