CN110957826A

CN110957826A - Cooling structure, oil-cooled motor and vehicle

Info

Publication number: CN110957826A
Application number: CN201911261162.XA
Authority: CN
Inventors: 李晔; 李琦; 范涛; 王佐梁; 温旭辉
Original assignee: Institute of Electrical Engineering of CAS
Current assignee: Institute of Electrical Engineering of CAS
Priority date: 2019-12-10
Filing date: 2019-12-10
Publication date: 2020-04-03

Abstract

The invention relates to the technical field of oil-cooled motors, in particular to a cooling structure, which comprises: the first groove bodies are arranged on the outer peripheral wall of the stator at preset intervals and extend to the end part of the stator along the length direction of the stator; the end rings are symmetrically arranged at the end parts of the stator and are communicated with the first groove body; and the second groove bodies are respectively arranged on the two end rings and communicated with the first groove bodies to jointly form a cooling flow channel which is arranged in a roundabout manner and used for insulating liquid circulation so as to take away the heat of the stator. The invention provides a cooling structure which is simple in structure, strong in cooling capacity and good in heat dissipation effect. Still provide an oil-cooled motor and vehicle simultaneously.

Description

Cooling structure, oil-cooled motor and vehicle

Technical Field

The invention relates to the technical field of oil-cooled motors, in particular to a cooling structure, an oil-cooled motor and a vehicle.

Background

The motor is a power source of the new energy automobile, and the motor is used as a key part for mutually converting a power supply and mechanical energy. However, when the motor is used, a large amount of heat can be generated, if the large amount of heat on the motor is not dissipated, the service life and the energy efficiency of the motor can be directly influenced, and the motor can be damaged due to serious heating.

The cooling modes of the existing motor are generally air cooling, water cooling and oil cooling, but the cooling efficiency of the air cooling and the water cooling is lower. In order to achieve higher power density of the motor, part of the motor is cooled in an oil cooling mode. However, in the oil-cooled motor, it is necessary to avoid the situation that the motor rotor stirs a large amount of cooling oil at a high speed, and a common technique is to add a device such as an isolation sleeve between the stator and the rotor to isolate the cooling oil from the rotor, or to arrange a cooling flow channel on the inner wall of the casing. For example, chinese patent document CN109756056A discloses a motor, a power train, and a motor cooling method for a power plant, in which an oil sump is provided in a housing of the motor, and the motor is cooled by the oil sump provided in the housing. However, the motor shell structure is complex, and the manufacturing and processing difficulty is increased.

Disclosure of Invention

Therefore, the technical problem to be solved by the invention is to provide a cooling structure, an oil-cooled motor and a vehicle, which have the advantages of simple structure, strong cooling capacity and good heat dissipation effect, aiming at the defects of relatively complex cooling structure and poor heat dissipation effect in the prior art.

In order to solve the above technical problem, the present invention provides a cooling structure, including:

the first groove bodies are arranged on the outer peripheral wall of the stator at preset intervals and extend to the end part of the stator along the length direction of the stator;

the end rings are symmetrically arranged at the end parts of the stator and are communicated with the first groove body;

and the second groove bodies are respectively arranged on the two end rings and communicated with the first groove bodies to jointly form a cooling flow channel which is arranged in a roundabout manner and used for insulating liquid circulation so as to take away the heat of the stator.

Further, the second grooves on the two end rings are arranged in a staggered mode.

Further, the projections of the second grooves on the end ring are uniformly distributed along the circumferential direction of the end ring.

Furthermore, the cooling flow channel is a plurality of U-shaped channels connected end to end.

Further, the stator includes: the first groove body is arranged on the outer peripheral wall of the cylindrical body;

the yoke portion, integrated into one piece be in on the inner wall of tube-shape body, the diapire of first cell body does not extend to on the yoke portion.

Further, still include: the liquid outlet is arranged at one end of one of the second groove bodies;

the inlet is arranged at the other end of the second groove body where the liquid outlet is located, and the insulating liquid flows through the inlet to the second groove body and the first groove body in sequence and then flows out of the liquid outlet.

The invention also provides an oil-cooled motor which comprises the cooling structure.

Further, still include the casing, the cover is established on the periphery wall of stator, with first cell body constitutes the airtight space that allows the circulation of insulating liquid.

The invention also provides a vehicle comprising the oil-cooled motor.

The technical scheme of the invention has the following advantages:

1. the cooling structure provided by the invention comprises a plurality of first groove bodies, a plurality of second groove bodies and a plurality of cooling units, wherein the first groove bodies are arranged on the peripheral wall of a stator at preset intervals and extend to the end part of the stator along the length direction of the stator; the end rings are symmetrically arranged at the end parts of the stator and are communicated with the first groove body; and the second groove bodies are respectively arranged on the two end rings and communicated with the first groove bodies to jointly form a cooling flow channel which is arranged in a roundabout manner and used for insulating liquid circulation so as to take away the heat of the stator. The cooling flow channel is divided into a plurality of first groove bodies and a plurality of second groove bodies, so that the first groove bodies arranged on the outer peripheral wall of the stator and the second groove bodies arranged on the end rings can be conveniently processed, and the processing difficulty of the first groove bodies and the second groove bodies is reduced; this cooling flow channel's simple structure to insulating liquid can directly act on the periphery wall of stator, and then directly acts on the part inside the stator, and the produced heat of motor stator work is directly taken away to the insulating liquid of being convenient for, thereby reaches better cooling effect, and then has improved the radiating effect of motor. Compared with an oil-cooled motor in the prior art, the motor is simple in structure, has the function of efficient cooling, is simple in processing and manufacturing of the first groove body on the stator and the second groove body on the end ring, reduces manufacturing and transformation difficulty, and greatly reduces processing cost.

2. In the cooling structure provided by the invention, the plurality of second grooves on the two end rings are arranged in a staggered manner. The cooling flow channel which is arranged in a roundabout mode is formed by the first groove bodies and the second groove bodies, the heat dissipation area is increased, and therefore the heat dissipation effect is improved.

3. In the cooling structure of the present invention, the stator includes: the first groove body is arranged on the outer peripheral wall of the cylindrical body; yoke portion, integrated into one piece is in on the inner wall of barrel body, the diapire of first cell body does not extend to on the yoke portion. The problems that the first groove body is arranged at the yoke part of the motor stator, so that the equivalent magnetic resistance of a motor magnetic circuit is increased, the air gap magnetic density is reduced, the unit current output torque capacity of the motor is reduced, and the efficiency is reduced are solved. Therefore, the first groove body is arranged on the peripheral wall of the cylindrical body, and the overall performance of the motor is not affected.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic structural view of a cooling structure provided by the present invention;

FIG. 2 is a schematic structural view of a stator;

FIG. 3 is a schematic structural view of an end ring;

FIG. 4 is a left side view of the stator after engagement with an end ring;

FIG. 5 is a right side view of the stator after engagement with the end ring;

FIG. 6 is a schematic structural view of the stator engaged with the housing;

description of reference numerals:

1-a machine shell; 2-a stator; 3-a first trough body; 4-an end ring; 5-a second trough body; 6-a liquid outlet; 7-liquid inlet; 8-a liquid outlet pipe; 9-a liquid inlet pipe; 10-a cylindrical body; 11-a yoke;

Detailed Description

The technical scheme of the invention is clearly and completely described below with reference to the accompanying drawings; obviously; the described embodiments are a part of the present invention; rather than all embodiments. Based on the embodiments of the invention; all other embodiments obtained by a person skilled in the art without making any inventive step; all fall within the scope of protection of the present invention.

Furthermore; the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1 to 6, an embodiment of the present invention provides a cooling structure provided in an oil-cooled motor, the cooling structure including a stator 2 and an end ring 4;

a plurality of first groove bodies 3 uniformly arranged on the outer circumferential wall of the stator 2 at predetermined intervals, and extending to the end of the stator 2 along the length direction of the stator 2;

an end ring 4, having two ends, symmetrically arranged at the end of the stator 2, for communicating with the first groove 3;

and the plurality of second groove bodies 5 are respectively arranged on the two end rings 4, and the second groove bodies 5 are communicated with the first groove bodies 3 to jointly form a cooling flow channel which is arranged in a roundabout manner and is used for insulating liquid circulation so as to take away the heat of the stator.

The cooling flow channel is divided into a plurality of first groove bodies 3 and a plurality of second groove bodies 5, so that the first groove bodies 3 and the second groove bodies 5 which are respectively arranged on the outer peripheral wall of the stator 2 and the end ring 4 can be conveniently processed, and the processing difficulty of the first groove bodies 3 and the second groove bodies 5 is reduced; and this cooling flow channel's simple structure, insulating liquid can directly be used in on the periphery wall of stator 2, the heat that is produced by the motor is directly taken away to the insulating liquid of being convenient for to reach better cooling effect, improved the radiating effect of motor. In this embodiment, the insulating liquid is a lubricating oil. The number of the first trough body 3 and the second trough body 5 is determined according to actual needs. Compared with the oil cooling motor in the prior art, the oil cooling motor with the cooling structure has the advantages that the structure is simpler, the processing and manufacturing of a cooling flow channel are facilitated, meanwhile, manpower and material resources are reduced, and the processing cost can be effectively reduced.

Wherein, the number of first cell body 3 is confirmed according to actual need, and the number of first cell body 3 is more, has increased the heat radiating area of first cell body 3 on 2 periphery walls of stator, and is corresponding, and the radiating effect who reaches is better.

The distance between two adjacent first tank bodies 3 is determined according to actual needs; the arc length and the number of the second groove bodies 5 are determined according to actual needs.

As an alternative embodiment, the distance between two adjacent first grooves 3 may be non-uniform.

As shown in fig. 1 to 3, the second grooves 5 on the two end rings 4 are arranged in a staggered manner. The setting is at stator 2 left end ring 4 for first end ring, the end ring 4 that sets up on stator 2 right side is the second end ring, the second cell body 5 that sets up on first end ring sets up with setting up the second cell body 5 on second end ring 4 is crisscross, set up second cell body 5 and first cell body 3 on first end ring promptly and be connected, then second cell body 5 on the second end ring is connected with this first cell body 3 again, second cell body 5 on this second end ring is connected with another first cell body 3 again simultaneously, thereby connect a plurality of first cell body 3 end to end through a plurality of second cell bodies 5, and the U-shaped cooling runner of constitution.

Wherein the sum of the projected arc lengths of the plurality of second grooves 5 on the end ring 4 is smaller than the circumference of the end ring 4, in this embodiment, the number of the second grooves 5 is 11, and the length of one second groove 5 is less than the circumference of the end ring 4.

In addition, in the present embodiment, the projections of the plurality of second grooves 5 on one of the end rings 4 are uniformly distributed along the circumferential direction of the end ring 4, so as to facilitate the processing of the second grooves 5.

As an alternative embodiment, the projection of a plurality of second grooves 5 on one of the end rings 4 may also be in a non-uniform distribution manner, and meanwhile, the communication between the second grooves 5 and the first grooves 3 may also be achieved; in this case, it is also necessary to change the distance of the first groove 3 from the outer circumferential wall of the stator.

As shown in fig. 4 to 5, the stator 2 includes a cylindrical body 10 and a yoke 11; the end rings 4 are arranged at two ends of the cylindrical body 10, and the first groove body 3 is arranged on the outer peripheral wall of the cylindrical body 10; in this embodiment, the cylindrical body 10 is a stator punching sheet; yoke portion 11 integrated into one piece is in on the inner wall of stator punching, the diapire of first cell body 3 does not extend to yoke portion 11. The stator 2 is used to generate a magnetic field and apply a force to a current-carrying conductor provided in the stator 2. The problems that the equivalent magnetic resistance of a motor magnetic circuit is increased, the air gap flux density is reduced, the unit current output torque capacity of the motor is reduced, and the efficiency is reduced due to the fact that the first groove body 3 is arranged on the yoke portion 11 of the motor stator punching sheet are solved. Therefore, the first groove body 3 can be arranged on the peripheral wall of the stator punching sheet, and the electromagnetic performance of the motor cannot be influenced.

As shown in fig. 3-4, the cooling device further includes a liquid outlet 6 and a liquid inlet 7 disposed on the cooling flow channel, wherein the liquid outlet 6 is disposed at one end of one of the second grooves 5, and a liquid outlet pipe 8 is disposed at the liquid outlet 6;

and the liquid inlet 7 is arranged at the other end of the second groove body 5 where the liquid outlet 6 is arranged, a liquid inlet pipe 9 is arranged at the liquid inlet 7, lubricating oil flows through the liquid inlet pipe 9 to the second groove body 5 and the first groove body 3 in sequence, flows according to the U-shaped channel connected end to end, and finally flows out through the liquid outlet pipe 8 to circulate, so that the stator 2 is cooled.

As an alternative embodiment, the liquid outlet 6 may be formed on the second groove 5 of the first end ring, and the liquid inlet 7 may be formed on the second groove 5 of the second end ring, so that the lubricating oil enters from the first end ring and flows out from the second end ring.

As shown in fig. 6, the oil-cooled motor further comprises a casing 1 directly sleeved on the outer circumferential wall of the stator 2, and the casing and the first groove 3 form a closed space. So that the lubricating oil can enter from the liquid inlet pipe 9 and flow out from the liquid outlet pipe 8, and a sealed space is formed by the casing 1 and the first groove body 3, thereby preventing the leakage of the lubricating oil. The casing 1 can take various forms, and the simple natural cooling casing or the liquid cooling casing can be adjusted according to the parameters required to be designed by the motor. If the liquid cooling machine shell is adopted, the lubricating oil part can cool the stator punching sheet and can cool the lubricating oil without adding a cooling device. The specific form can be adjusted according to the requirements.

The invention also provides a vehicle comprising the cooling structure of the oil-cooled motor.

Obviously; the above embodiments are merely examples provided for clarity of illustration; and not as restrictive. To one of ordinary skill in the art; other variations and modifications may be made on the basis of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A cooling structure, comprising:

the first groove bodies (3) are arranged on the outer peripheral wall of the stator (2) at preset intervals and extend to the end part of the stator (2) along the length direction of the stator (2);

end rings (4) which are symmetrically arranged at the end parts of the stator (2) and are used for communicating with the first groove bodies (3);

the plurality of second groove bodies (5) are respectively arranged on the two end rings (4), the second groove bodies (5) are communicated with the first groove bodies (3) to jointly form a cooling flow channel which is arranged in a roundabout mode and used for insulating liquid circulation, and therefore heat of the stator (2) is taken away.

2. A cooling structure according to claim 1, characterized in that the second slots (5) on both end rings (4) are staggered.

3. A cooling structure according to claim 1 or 2, characterized in that the projections of the second slots (5) on the end ring (4) are evenly distributed along the circumference of the end ring (4).

4. A cooling structure according to any one of claims 1 to 3, wherein the cooling flow channel is a plurality of U-shaped channels connected end to end.

5. A cooling structure according to any one of claims 1-4, characterized in that the stator (2) comprises:

the first groove body (3) is arranged on the outer peripheral wall of the cylindrical body (10);

a yoke (11) integrally formed on an inner wall of the cylindrical body (10), a bottom wall of the first groove body (3) not extending to the yoke (11).

6. The cooling structure according to any one of claims 1 to 5, further comprising:

the liquid outlet (6) is arranged at one end of one of the second groove bodies (5);

the liquid inlet (7) is arranged at the other end of the second groove body (5) where the liquid outlet (6) is located, and the insulating liquid flows through the liquid inlet (7) to the second groove body (5) and the first groove body (3) in sequence and then flows out of the liquid outlet (6).

7. An oil-cooled electric machine, characterized by comprising the cooling structure of any one of claims 1 to 6.

8. The oil-cooled motor of claim 7, further comprising:

and the shell (1) is sleeved on the peripheral wall of the stator (2) and forms a closed space allowing the insulating liquid to flow with the first groove body (3).

9. A vehicle comprising an oil-cooled electric machine according to claim 7 or 8.