CN115021437A

CN115021437A - Stator module, motor and have its car

Info

Publication number: CN115021437A
Application number: CN202210582929.4A
Authority: CN
Inventors: 常昆鹏; 薛家宁; 贾金信; 姜月明
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-05-26
Filing date: 2022-05-26
Publication date: 2022-09-06

Abstract

The application provides a stator assembly, a motor and an automobile with the stator assembly, wherein the stator core is provided with a cooling channel, cooling oil can enter the cooling channel to cool the stator core; the cooling oil can be sprayed to the stator winding through the oil injection structure so as to cool the stator winding. According to stator module, motor and have its car of this application, can improve stator cooling efficiency.

Description

Stator module, motor and have its car

Technical Field

This application belongs to car technical field, concretely relates to stator module, motor and have its car.

Background

At present, with the development of a main drive motor of a new energy automobile, the demand for a motor with high performance and high efficiency is increasing, but when the motor has high torque and high power density, the motor can not avoid generating high heat, so that the temperature rise of the motor is high, the service life of the motor is shortened, and therefore the thermal performance of the motor becomes one of important factors restricting the performance of the motor.

In the actual operation process of the motor, the working environment of the motor is severe, the ring temperature is high, and the conventional water cooling mode is not enough to meet the cooling requirement. Therefore, the direct oil cooling mode enters the sight of people, the cooling oil is directly contacted with each heating source of the motor to take away heat, each heating source of the main drive motor is effectively cooled, the oil-cooled motor is compared with the traditional water-cooled motor under the same performance requirement, the heat load is improved, the motor size can be reduced, the power density is further improved, the cooling oil can simultaneously lubricate and cool the motor bearing, and the service life of the motor is further prolonged. However, in order to meet the cooling requirement, the current oil-cooled motor has a complex oil circuit structure and a complex machining process, the oil circuit structure mostly adopts machining processes such as screw fastening and welding, and each part has a complex structure, high machining cost and low cooling efficiency.

Therefore, how to provide a stator assembly, a motor and a vehicle having the same, which can improve the cooling efficiency of the stator, is a problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

Therefore, the technical problem that this application will be solved lies in providing a stator module, motor and have its car, can improve stator cooling efficiency.

In order to solve the above problems, the present application provides a stator assembly including:

the stator core is provided with a cooling channel, and cooling oil can enter the cooling channel to cool the stator core;

a stator winding;

and the cooling oil can be sprayed to the stator winding through the oil spraying structure so as to cool the stator winding.

Further, the oil injection structure is communicated with the cooling channel, and cooling oil in the cooling channel can enter the oil injection structure.

Further, stator module still includes the casing, and stator core and stator winding all set up inside the casing, are provided with the intercommunication passageway on the casing, and the oil spout structure passes through the intercommunication with cooling channel.

Further, the oil injection structure comprises a first oil injection structure and a second oil injection structure; the first oil injection structure is arranged on the outer peripheral side of the stator winding, and the second oil injection structure is arranged on the inner peripheral side of the stator winding; the first oil injection structure and the second oil injection structure are communicated with the communicating channel.

Further, the communication channel comprises a first channel, a second channel and a third channel which are sequentially communicated; the first channel is positioned on the outer peripheral side of the stator winding, and the first oil injection structure is communicated with the first channel; the second channel is positioned at one end of the stator core; the third channel is located on the inner peripheral side of the stator winding, and the second oil injection structure is communicated with the third channel.

Further, the stator core is formed by overlapping stator punching sheets; the stator punching sheet comprises a first punching sheet, cooling holes are formed in the stator punching sheet, and the cooling holes are communicated with each other to form a cooling channel.

Further, the stator punching sheet comprises a second punching sheet, a communication hole is formed in the second punching sheet, the first punching sheet and the second punching sheet are mutually overlapped, and the communication hole can be communicated with each cooling channel, so that cooling oil can enter each cooling channel.

Furthermore, each first punching sheet is overlapped to form a first punching sheet group, at least one second punching sheet forms a second punching sheet group, the number of the second punching sheet groups is two, and the two second punching sheet groups are respectively arranged at two ends of the first punching sheet group.

Furthermore, the stator punching sheet comprises a third punching sheet, the third punching sheet forms the end part of the stator core, and the third punching sheet can be used for blocking the axial end part of the cooling channel.

Furthermore, ribs extending along the axial direction of the stator core are arranged in the cooling channel;

and/or the cooling channels extend in the axial direction of the stator core.

According to still another aspect of the present application, there is provided an electric machine including a stator assembly as described above.

According to still another aspect of the present application, there is provided an automobile including the motor, the motor being the motor described above.

The application provides a stator module, motor and have its car, stator cooling efficiency can be improved to this application. This application can improve stator cooling efficiency.

Drawings

Fig. 1 is a schematic structural view of a stator assembly according to an embodiment of the present application;

fig. 2 is a schematic structural view of a stator assembly according to an embodiment of the present application;

FIG. 3 is a flow diagram of a cooling oil according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of a first stamped sheet according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a first stamped sheet according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a second stamped sheet according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a third punching sheet according to an embodiment of the present application.

The reference numerals are represented as:

1. a stator oil inlet; 2. a housing; 3. a stator core; 4. a stator winding; 5. a rear end cap; 6. a first oil injection structure; 7. a second oil injection structure; 8. a rear bearing; 9. a main shaft; 10. a front end cover; 11. a first punching sheet; 12. a second punching sheet; 13. a front bearing; 14. a rotor; 15. ribs; 16. a stator oil outlet; 17. a communication channel; 18. a front three-way pipe; 19. a rear three-way pipe; 20. a communicating hole; 21. a cooling hole; 22. an inlet channel; 23. an outlet channel; 24. and a third punching sheet.

Detailed Description

Referring to fig. 1-7 in combination, a stator assembly includes a stator core 3, a stator winding 4, and an oil injection structure, the stator core 3 having a cooling channel into which cooling oil can enter to cool the stator core 3; the cooling oil can be sprayed toward the stator winding 4 through the oil injection structure to cool the stator winding 4. In the application, the cooling oil flows in the cooling channel on the stator core 3, and the cooling oil can be directly sprayed onto the surface of the stator winding 4, so that the cooling oil can directly contact the motor stator and the winding coil and cool the motor stator core 3 and the motor winding coil 4, the cooling efficiency is greatly improved, and the power density of the motor is improved; this application cooling oil circuit structure is ingenious, and the processing cost is low, and convenient assembling compares with the cold motor structure of oil among the prior art and realizes that the feasibility is high. The cooling oil of the cooling system can directly contact and cool the motor stator, so that the problems of uneven cooling of the middle winding of the stator core 3, uneven cooling of the end part coil and overhigh local temperature in the conventional oil cooling mode are solved, and the heat island effect in the motor is reduced, so that the stability of the motor is improved and the service life of the motor is prolonged; through this application stator cooling structure, can effectively solve the inhomogeneous problem of stator core 3 temperature, have corresponding cooling, cooling efficiency improves by a wide margin, promotes the power density of motor. The stator core 3 is provided with cooling slots to form cooling channels.

The following technical problems that can be solved by the application are as follows:

1. in the prior art, the cooling mode of a main drive motor is a water cooling mode, and because water has the characteristics of electric conduction and corrosion, cooling water can only circulate in an interlayer of a machine shell, a stator iron core 3 transfers heat to the machine shell through heat conduction, the heat is taken away through the flow of circulating water, a stator winding 4 is not in contact with the machine shell, and the heat is not directly cooled;

2. in the prior art, in order to meet the cooling requirement, an oil cooling motor is complex in oil path structure and complex in processing technology, the oil path structure is mostly fastened by screws, welded and other processing technologies, and parts are complex in structure and high in processing cost.

3. The problem that a stator core 3 of a main drive motor generates heat seriously in the prior art;

4. the problem of the noise is too high when the motor in the prior art is operated is reduced.

The application also discloses some embodiments, the oil spout structure communicates with cooling channel, and the cooling oil in the cooling channel can get into the oil spout structure, and the cooling oil flows into in the oil spout structure to stator core 3 cooling back when flowing in cooling channel promptly, and then spouts to stator winding 4, continues to cool off stator winding 4, can carry out abundant utilization to the cold volume of cooling oil.

The application also discloses some embodiments, stator module still includes casing 2, and stator core 3 and stator winding 4 all set up inside casing 2, are provided with communicating channel 17 on casing 2, and the oil spout structure passes through communicating channel 17 intercommunication with cooling channel. When the cooling oil after cooling the stator core 3 flows to the oil injection structure through the communication channel 17 on the shell 2, the cooling oil is cooled to a certain extent through the shell 2, so that the cooling oil can better cool the stator winding 4.

The application also discloses some embodiments, the oil injection structure comprises a first oil injection structure 6 and a second oil injection structure 7; the first oil injection structure 6 is arranged on the outer peripheral side of the stator winding 4, and the second oil injection structure 7 is arranged on the inner peripheral side of the stator winding 4; the first oil injection structure 6 and the second oil injection structure 7 are both communicated with a communication channel 17. The cooling oil flows to the first oil injection structure 6 and the second oil injection structure 7 through the communication channel 17 simultaneously, and simultaneously cools the inner circumference side and the outer circumference side of the stator winding 4, so that the cooling effect is better. The first oil injection structure 6 is an annular structure extending around the outer circumference of the stator core 3, and the second oil injection structure 7 is an annular structure extending around the inner circumference of the stator core 3.

The application also discloses some embodiments, the communication channel 17 comprises a first channel, a second channel and a third channel which are sequentially communicated; the first channel is positioned on the outer peripheral side of the stator winding 4, and the first oil injection structure 6 is communicated with the first channel; the second channel is located at one end of the stator core 3; the third channel is positioned on the inner peripheral side of the stator winding 4, and the second oil injection structure 7 is communicated with the third channel. Namely, the cooling oil flows to the first oil injection structure 6 through the first passage, at the moment, the first oil injection structure 6 performs oil injection cooling on the outer peripheral side of the stator winding 4, and the other part of the cooling oil flows to the second oil injection structure 7 through the first passage and the second passage in sequence to perform oil injection cooling on the inner peripheral side of the stator winding 4, so that the cooling effect is better. The first channel, the second channel and the first oil injection structure 6 are communicated by a three-way pipe, and the three-way pipe comprises a front three-way pipe 18 and a rear three-way pipe 19 which are positioned at two ends of the stator iron core. . The number of the second channels and the number of the third channels are set into two groups, the number of the second channels in each group of the second channels is set into at least one, and the number of the third channels in each group of the third channels is set into at least one; the two groups of second channels are respectively arranged at two ends of the stator core 3, and the two groups of third channels are respectively arranged at two ends of the stator core 3; the number of the communication passages 17 may also be provided in plural. In the present application, the inner peripheral side of the stator winding 4 refers to a side closer to the stator core with respect to the housing; the number of the first passages is set to at least one.

The application also discloses some embodiments, the stator core 3 is formed by overlapping the stator punching sheets; the stator punching sheet comprises a first punching sheet 11, cooling holes 21 are formed in the stator punching sheet, and the cooling holes 21 are communicated with each other to form a cooling channel. The cooling holes 21 are correspondingly arranged.

The application also discloses some embodiments, the stator punching sheet comprises a second punching sheet 12, the second punching sheet 12 is provided with a communicating hole 20, the first punching sheet 11 and the second punching sheet 12 are mutually overlapped, and the communicating hole 20 can be communicated with each cooling channel, so that cooling oil can enter each cooling channel. Further, it is possible to enable the cooling oil to enter into the respective cooling passages, that is, each communication hole 20 communicates the adjacent two cooling passages; so that the cooling oil assumes an s-shaped flow, i.e. the cooling oil in one of the axially extending cooling channels passes through the corresponding cooling channel into the adjacent other axially extending cooling channel. All cooling channels on the entire stator core 3 communicate to form an entire passage.

The application also discloses some embodiments, the first punching sheets 11 are overlapped to form a first punching sheet group, the at least one second punching sheet 12 forms a second punching sheet group, the number of the second punching sheet groups is set to be two, and the two second punching sheet groups are respectively arranged at two ends of the first punching sheet group. After this application stator punching sheet lamination is into stator core 3, a plurality of cavitys, the runner of formation not only can cool off the stator, can also effectively reduce motor noise, and material saving realizes the lightweight simultaneously.

The application also discloses some embodiments, the stator punching sheet comprises a third punching sheet 24, the third punching sheet 24 forms the end part of the stator core 3, and the third punching sheet 24 can block the axial end part of the cooling channel.

1. This application cooling system is single oil cooling system, and the cooling oil directly gets into the inside cooling stator of motor, winding solenoid, rotor 14 and lubricated bearing.

2. This application is folded through the stator punching of several kinds of not isostructures and is pressed, the riveting, at the inside axial cooling runner that forms of stator core 3, inside cooling oil directly gets into stator core 3, flows through the winding solenoid again, can effectively cool off stator core 3 and tip solenoid to reduce the inside temperature of motor.

3. The cooling device is ingenious in structure, convenient to assemble, free of the need of adding other fastening parts, capable of saving processing and assembling cost and capable of greatly improving cooling efficiency.

4. This application is through increasing cavity runner and heat conduction muscle increase heat transfer area in the stator for stator core 3 dispels the heat, effectively improves the stator problem of generating heat.

5. The cavity runner that three kinds of stator punching sheet cell types of this application formed also is sound-proof chamber, can effectively reduce the noise when the motor moves.

The present application also discloses embodiments in which cooling channels are provided with ribs 15 extending axially along the stator core 3; the flow of the cooling oil can be guided, and the cooling passage extends in the axial direction of the stator core 3.

The application provides a brand-new energy automobile main drive motor cooling scheme has end cover, casing and cooling runner structure's stator core 3's driving motor. This scheme adopts single oil cooling technique, and through set up stator oil inlet 1 on casing and stator core 3, the cooling oil gets into motor stator core 3 and cools off the stator, cools off stator end winding recooling behind the stator, flows through stator oil-out 16 at last.

This application driving motor comprises following spare part: the shell 2 comprises a shell, a front end cover 10, a rear end cover 5, a stator, a rear oil spraying outer ring, namely a first oil spraying structure 6, a rear oil spraying inner ring, namely a second oil spraying structure 7, a rear bearing 8, a motor main shaft 9, a front oil spraying outer ring, a front oil spraying inner ring, a front bearing 13, a rotor 14 iron core, a front three-way pipe 18, a rear three-way pipe 19 and parts, and the parts are assembled and combined to form a cooling oil flow passage inside the motor. This application driving motor mainly is applied to new energy automobile, and the motor cools off through the cooling oil, and the inside cooling oil that adopts of motor promptly cools off.

This application driving motor entry section view, cooling oil at first get into motor stator core 3 inside axial oil duct through the casing by the hydraulic fluid inlet, cool off stator core 3.

This application stator core 3 structural schematic diagram sets up oil inlet, oil-out on the iron core.

This application stator structure section sketch map, iron core internal flow channel are the axial runner, increase oval structure heat conduction muscle simultaneously on the straight runner, and its purpose is first for increasing heat transfer area, and second is for increasing inside coolant liquid vortex, reinforcing heat transfer ability.

According to the sectional view of the outlet of the driving motor, cooling oil after cooling the stator flows to the axial flow channel of the shell from the oil outlet and flows to the rear end cover 5 and the front end cover 10 respectively, and the cooling oil flows through the front and rear oil injection outer rings and the front and rear oil injection inner rings through the three-way pipe to cool the end winding of the stator.

The stator core 3 is internally provided with an axial flow channel, the structure is simple, the manufacturing process is simple, and three punching sheets can be laminated to form the stator core, so that the batch production is accelerated. Meanwhile, the requirements of different motors can be met by changing the number of punching sheets.

For the schematic diagram of the third stator punching sheet 24, the stator punching sheet model is consistent with the existing model and has no change.

Keeping the coaxiality with the third punching sheet 24. A periodic circular hole 20 with the depth of 4-5mm is formed at a position 2-3mm away from the excircle of the punching sheet, and the purpose is that a plurality of punching sheets are laminated to form a radial channel of an axial flow channel.

As shown in fig. 7, a schematic diagram of a stator punching sheet three in the present application is shown, the stator punching sheet three maintains coaxiality with a third punching sheet 24 and a second punching sheet, and for the third punching sheet, periodic circular arc holes are formed at the same positions as the circular arc holes of the second punching sheet, and the size of the periodic circular arc holes is one third of the circular arc holes of the second punching sheet. Meanwhile, a projection of a semicircular structure is arranged in the circular arc hole, and the radius of the projection is half of the depth of the circular arc hole. The arc holes of the inlet channel 22 and the outlet channel 23 are not provided with semicircular projections, so as to reduce the pressure of the inlet and the outlet.

And overlapping and welding a plurality of three punching sheets according to the sequencing sequence of the third punching sheet 24, the second punching sheet 12, the first punching sheet 11, the second punching sheet 12 and the third punching sheet 24 to finally form an iron core structure with an axial flow channel inside. When a plurality of second punching sheets 12 are laminated, a radial channel can be formed. The punching sheets are laminated to form an axial channel, and the channel is internally provided with a heat conducting rib 15 with a semicircular structure. The stator punching is folded and is pressed the cavity that forms and can effectively reduce the motor noise, and the heat-conducting rib that increases simultaneously can strengthen stator core 3's heat-sinking capability.

According to the cooling flow channel oil circuit circulation flow chart, cooling oil enters the motor stator iron core 3 from an external oil circuit through the electric oil inlet, flows into the shell after winding the iron core for one circle, and is divided into two paths after axially flowing into the shell. One path flows into the front end cover 10 and then flows to the front oil injection outer ring and the front oil injection inner ring through the front three-way pipe 18 to cool the front end winding of the stator; the other way flows to the rear end cover 5 and flows to the rear oil spraying outer ring and the oil spraying inner ring through the rear three-way pipe 19 to cool the winding at the rear end of the stator.

The cooling system of the driving motor can fundamentally solve the problem that the stator winding 4 of the current water-cooled driving motor cannot be cooled, can also solve the problems of overhigh temperature of the stator core 3 and uneven cooling of the winding in the existing oil cooling mode, and further reduces the heat island effect in the motor; the motor is cooled by a main heating source in the motor, so that the power density of the motor is improved, and the stability and the service life of the motor are effectively improved; meanwhile, the structure of the punching sheet of the stator core 3 is changed, the cost is reduced, and the integration of a main drive motor system is realized.

According to an embodiment of the application, an electric machine is provided, comprising a stator assembly, which is the above-mentioned stator assembly.

According to an embodiment of the application, an automobile is provided, which comprises an electric motor, wherein the electric motor is the electric motor. It is readily understood by a person skilled in the art that the advantageous ways described above can be freely combined, superimposed without conflict.

The present invention is not intended to be limited to the particular embodiments shown and described, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed. The foregoing is only a preferred embodiment of the present application, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present application, and these modifications and variations should also be considered as the protection scope of the present application.

Claims

1. A stator assembly, comprising:

a stator core (3), the stator core (3) having a cooling channel into which cooling oil can enter to cool the stator core (3);

a stator winding (4);

and the oil injection structure can be used for injecting cooling oil to the stator winding (4) so as to cool the stator winding (4).

2. The stator assembly of claim 1, wherein the oil injection structure is in communication with the cooling passage, and wherein cooling oil within the cooling passage is capable of entering the oil injection structure.

3. The stator assembly according to claim 1, characterized in that the stator assembly further comprises a housing (2), the stator core (3) and the stator windings (4) are both disposed inside the housing (2), a communication channel (17) is disposed on the housing (2), and the oil injection structure is communicated with the cooling channel through the communication channel (17).

4. A stator assembly according to claim 3, characterized in that the oil injection structure comprises a first oil injection structure (6) and a second oil injection structure (7); the first oil injection structure (6) is arranged on the outer peripheral side of the stator winding (4), and the second oil injection structure (7) is arranged on the inner peripheral side of the stator winding (4); the first oil injection structure (6) and the second oil injection structure (7) are communicated with the communication channel (17).

5. The stator assembly according to claim 4, characterized in that said communication channels (17) comprise a first channel, a second channel and a third channel in communication in sequence; the first channel is positioned on the outer peripheral side of the stator winding (4), and the first oil injection structure (6) is communicated with the first channel; the second channel is positioned at one end of the stator core (3); the third channel is located on the inner peripheral side of the stator winding (4), and the second oil injection structure (7) is communicated with the third channel.

6. The stator assembly according to claim 1, characterized in that the stator core (3) is formed by stacking stator laminations; the stator punching sheet comprises a first punching sheet (11), cooling holes (21) are formed in the stator punching sheet, and the cooling holes (21) are communicated with one another to form the cooling channel.

7. The stator assembly according to claim 6, characterized in that the stator punching sheet comprises a second punching sheet (12), a communication hole (20) is arranged on the second punching sheet (12), the first punching sheet (11) and the second punching sheet (12) are mutually overlapped, and the communication hole (20) can communicate with each cooling channel, so that cooling oil can enter each cooling channel.

8. The stator assembly according to claim 7, characterized in that the first punching sheets (11) are stacked to form a first punching sheet group, at least one second punching sheet (12) forms a second punching sheet group, the number of the second punching sheet groups is two, and the two second punching sheet groups are respectively arranged at two ends of the first punching sheet group.

9. The stator assembly according to claim 6, characterized in that the stator laminations comprise third laminations (24), the third laminations (24) forming the ends of the stator core (3), and the third laminations (24) being capable of blocking the axial ends of the cooling channels.

10. The stator assembly according to claim 1, characterized in that ribs (15) extending axially along the stator core (3) are provided in the cooling channels;

and/or the cooling channels extend in the axial direction of the stator core (3).

11. An electrical machine comprising a stator assembly, characterized in that the stator assembly is a stator assembly according to any of claims 1-10.

12. A motor vehicle comprising an electric machine, characterized in that the electric machine is an electric machine as claimed in claim 11.