CN116014980A

CN116014980A - Oil cooling motor and rotor assembly thereof

Info

Publication number: CN116014980A
Application number: CN202211618433.4A
Authority: CN
Inventors: 曹熙; 王松; 吴从波; 陈静; 高志川
Original assignee: Fangdi Application Technology Shanghai Co ltd; Lishui Fangde Zhiqu Applied Technology Research Institute Co ltd
Current assignee: Fangdi Application Technology Shanghai Co ltd; Lishui Fangde Zhiqu Applied Technology Research Institute Co ltd
Priority date: 2022-12-15
Filing date: 2022-12-15
Publication date: 2023-04-25
Also published as: WO2024124853A1

Abstract

The invention relates to an oil-cooled motor and a rotor assembly thereof, wherein the rotor assembly comprises a rotor iron core and a rotor shaft, a radial oil groove B for conducting the inner side and the outer side of the rotor iron core is arranged on the rotor iron core, a middle axial oil duct is formed in the rotor shaft in a hollow mode, at least one end of the rotor shaft is provided with a rotor oil inlet, and a communication hole for communicating the radial oil groove B with the middle axial oil duct is further formed in the side wall of the rotor shaft. The rotor assembly is provided with a rotor oil way, and the surfaces of the middle parts of the rotor and the stator are cooled by oil injection of the rotor middle rotor oil guide plate; the cooling oil directly cools the middle part of the rotor and the surface of the middle part of the stator, so that the temperature of the magnetic steel and the temperature of the insulating material in the middle part of the winding slot can be greatly reduced; the motor performance can be effectively improved.

Description

Oil cooling motor and rotor assembly thereof

Technical Field

The invention relates to the technical field of motors, in particular to an oil-cooled motor and a rotor assembly thereof.

Background

The new energy automobile has extremely high requirements on the power density (torque density) of the driving motor for the automobile due to the requirements on the quality and the space of the whole automobile; on the other hand, the speed of the motor for the vehicle has become a recognized necessary trend by related manufacturers. The characteristics of large rotating speed range and high power density of the embedded permanent magnet synchronous motor have become the preferred type of driving motor for vehicles.

The driving motor for the vehicle has high requirement on the rotating speed of the motor, and the highest rotating speed can reach tens of thousands of revolutions per minute. Various losses generated during the operation of the motor are converted into heat, so that each component of the motor generates heat and the temperature is increased. The limit value of the temperature rise directly influences the service life of the motor; and because the harmonic magnetic field of the stator armature and the harmonic magnetic field of the rotor magnetic steel can generate larger eddy current loss on the magnetic steel, the temperature of the magnetic steel is further increased. The problem of heat dissipation of the new energy driving motor is always a problem which needs to be overcome by the technicians in the field.

Current cooling schemes for drive motors for vehicles generally include the following: 1. injecting oil at the end part of the stator; 2. the rotor throws oil; 3. oil injection at the end part of the stator and oil throwing of the rotor; however, the above cooling methods have the following drawbacks: 1. the cooling effect of the middle magnetic steel is not obvious because the cooling liquid is far away from the middle magnetic steel; 2. the temperature in the middle slot of the stator is higher than that at the two ends, and the weakest insulating material in the middle slot is easy to generate thermal failure.

Disclosure of Invention

In order to solve the above technical problems, a first object of the present invention is to provide a rotor assembly with better cooling effect in the middle of the rotor assembly, and a second object of the present invention is to provide an oil-cooled motor.

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

the utility model provides a rotor subassembly, includes rotor core and rotor shaft, be equipped with the radial oil groove B that switches on the inside and outside of rotor core on the rotor core, the inside cavity of rotor shaft forms middle part axial oil duct, and at least one end is equipped with the rotor oil inlet, still be equipped with the intercommunicating pore that is used for intercommunication radial oil groove B and middle part axial oil duct on the lateral wall of rotor shaft.

As a preferable scheme: at least one rotor oil guide plate is clamped in the rotor core, and the radial oil groove B is formed in the rotor oil guide plate.

As a preferable scheme: the rotor oil guide plate is located in the middle of the rotor iron core, and the radial oil grooves B are arranged in multiple channels at equal intervals along the circumferential direction.

As a preferable scheme: and an axial oil way B is further arranged on the rotor core, and one end of the axial oil way B is communicated with the radial oil groove B.

As a preferable scheme: the two ends of the rotor core are respectively provided with a rotor end plate, the rotor end plates are provided with oil channels, and one ends of the oil channels are communicated with the other ends of the axial oil channels B.

As a preferable scheme: two ends of the oil duct are respectively positioned at two sides of the rotor end plate, and one end of the oil duct, which is communicated with the axial oil duct B, is closer to the rotor shaft than the other end of the oil duct.

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

an oil-cooled motor comprising a housing, a stator assembly disposed within the housing, and a rotor assembly rotatably coupled to both ends of the housing, the rotor assembly as described in any one of the preceding claims.

As a preferable scheme: the stator assembly comprises a stator core and windings, wherein winding grooves are formed in the stator core, the windings are inserted into the winding grooves, a circle of grooves are formed in the side wall of the stator core, a stator oil inlet is formed in the side wall of the casing, the stator oil inlet is communicated with the grooves, and at least one axial oil way A is formed in each of the two side walls of the grooves.

As a preferable scheme: and oil guide rings are respectively arranged at two ends of the stator iron core, the oil guide rings are communicated with the axial oil way A, and the side walls of the oil guide rings are provided with oil spray holes facing the windings.

As a preferable scheme: at least one stator oil guide plate is clamped in the stator core, a radial oil groove A is formed in the stator oil guide plate, and the radial oil groove A is communicated with the groove.

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

the rotor assembly is provided with a rotor oil way, and the surfaces of the middle parts of the rotor and the stator are cooled by oil injection of the rotor middle rotor oil guide plate; the cooling oil directly cools the middle part of the rotor and the surface of the middle part of the stator, so that the temperature of the magnetic steel and the temperature of the insulating material in the middle part of the winding slot can be greatly reduced; the motor performance can be effectively improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and 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 do not limit the application.

FIG. 1 is a schematic side view of an electric motor according to the present invention;

FIG. 2 isbase:Sub>A sectional view A-A of FIG. 1;

FIG. 3 is a schematic end-face structure of the motor of the present invention;

FIG. 4 is a cross-sectional view B-B of FIG. 3;

FIG. 5 is a schematic view of a structure of a rotor oil guide plate according to the present invention;

fig. 6 is a schematic structural diagram of a stator oil guide plate according to the present invention.

The reference numerals are: 1. a housing; 2. a stator oil inlet; 3. a stator core; 4. an axial oil path A; 5. a stator oil guide plate; 6. a radial oil groove A; 7. winding slots; 8. a rotor shaft; 9. a middle axial oil passage; 10. a communication hole; 11. rotor oil guide plate; 12. a radial oil groove B; 13. an end cap; 14. an oil outlet; 15. a winding; 16. oil guiding ring; 17. a rotor core; 18. a rotor end plate; 19. an oil passage; 20. and an axial oil path B.

Detailed Description

It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present application. 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 in accordance with the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

Furthermore, in the description of the present invention, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "clockwise," "counterclockwise," etc. indicate or are based on the orientation or positional relationship shown in the drawings, merely for convenience of description and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention.

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

In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

the utility model provides an oil cooling motor as shown in fig. 1 to 4, includes casing 1, the stator module of setting in casing 1 and the rotor subassembly of being connected with casing 1 both ends rotation, the rotor subassembly includes rotor core 17 and rotor shaft 8, be equipped with the radial oil groove B12 that switches on the inside and outside of rotor core 17 on the rotor core 17, the inside cavity of rotor shaft 8 forms middle part axial oil duct 9, and at least one end is equipped with the rotor oil inlet, still be equipped with the intercommunicating pore 10 that is used for intercommunication radial oil groove B12 and middle part axial oil duct 9 on the lateral wall of rotor shaft 8, the both ends of casing 1 are end cover 13, be equipped with oil-out 14 on the end cover 13.

At least one rotor oil guide plate 11 is sandwiched in the rotor core 17, and the radial oil groove B12 is provided on the rotor oil guide plate 11. The rotor oil guide plate 11 is located in the middle of the rotor core 17, and the radial oil grooves B12 are equidistantly arranged in a plurality of channels along the circumferential direction. The rotor oil guide plate 11 is also provided with a magnetic steel groove, and the radial oil groove B12 bypasses the magnetic steel groove (as shown in fig. 5).

The rotor core 17 is further provided with an axial oil path B20, and one end of the axial oil path B20 is communicated with the radial oil groove B12. The two ends of the rotor core 17 are respectively provided with a rotor end plate 18, the rotor end plate 18 is provided with an oil duct 19, and one end of the oil duct 19 is communicated with the other end of the axial oil path B20.

The two ends of the oil passage 19 are respectively located at two sides of the rotor end plate 18, and one end of the oil passage 19, which is communicated with the axial oil passage B20, is closer to the rotor shaft 8 than the other end of the oil passage 19.

The radial oil way structure on the rotor core enables cooling oil input from the oil inlet of the rotor to spray oil through the middle oil guide plate of the rotor to cool the middle surface of the rotor and the stator; meanwhile, cooling oil sprays oil to cool the rotor assembly and the stator end windings through the axial oil paths inside the rotor core and on the rotor and the end plates at the two sides; the cooperation of radial oil circuit and axial oil circuit makes the cooling of whole rotor more abundant, and the effect is better, has also cooled down stator middle part surface and end winding simultaneously.

The stator assembly comprises a stator core 3 and windings 15, the stator core 3 is provided with winding grooves 7, the windings 15 are inserted in the winding grooves 7, a circle of grooves are formed in the side wall of the stator core 3, a stator oil inlet 2 is formed in the side wall of the casing 1, the stator oil inlet 2 is communicated with the grooves, at least one axial oil way A4 is formed in the two side walls of the grooves respectively, multiple axial oil ways A4 are arranged at equal intervals along the circumferential direction, and each axial oil way A4 penetrates through the stator core 3.

The two ends of the stator core 3 are respectively provided with an oil guide ring 16, the oil guide rings 16 are communicated with the axial oil way A4, and the side wall of each oil guide ring 16 is provided with an oil injection hole facing the winding 15.

At least one stator oil guide plate 5 is clamped in the stator core 3, a radial oil groove A6 is formed in the stator oil guide plate 5, and the radial oil groove A6 is communicated with the groove. The outer diameter of the stator oil guide plate 5 is smaller than that of the stator core 3, the groove is formed by the stator oil guide plate 5 and two stator punching sheets adjacent to the stator oil guide plate 5, winding grooves are also formed in the stator oil guide plate 5, and the radial oil grooves A6 avoid the winding grooves (as shown in fig. 6).

The number of the stator oil guide plates and the number of the rotor oil guide plates can be one or more, when the number of the stator oil guide plates is one, the oil guide plates are positioned in the axial middle of the stator or the rotor, so that the cooling oil uniformly contacts the whole rotor or the stator as much as possible, and when the number of the stator oil guide plates is multiple, the plurality of the oil guide plates are arranged at intervals as much as possible in order to ensure that the cooling oil uniformly contacts the whole rotor or the stator.

The stator assembly of the invention is provided with a stator oil way: the cooling oil entering from the stator oil inlet of the shell passes through the stator oil guide plate to cool the surface of the middle part of the rotor and the stator; the cooling oil cools the end windings through an axial oil duct in the stator core and oil guiding rings on two sides; the structure ensures that the cooling oil directly cools the middle area of the stator, reduces the temperature and avoids the heat failure of the weakest insulating material in the groove in the middle of the stator; therefore, the power density of the motor is improved, and the power and the torque of the motor can be improved.

The stator oil guide plate and the rotor oil guide plate are both made of amorphous materials, and the structure ensures that the increased oil guide plate can output performance and reduces waste of copper wires and axial space.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by those skilled in the art without departing from the spirit and principles of the invention, and any simple modification, equivalent variation and modification of the above embodiments in light of the technical principles of the invention may be made within the scope of the present invention.

Claims

1. A rotor assembly, characterized in that: including rotor core (17) and rotor shaft (8), be equipped with radial oil groove B (12) that switch on the inside and outside of rotor core (17) on rotor core (17), the inside cavity of rotor shaft (8) forms middle part axial oil duct (9), and at least one end is equipped with the rotor oil inlet, still be equipped with on the lateral wall of rotor shaft (8) and be used for intercommunication radial oil groove B (12) and communication hole (10) of middle part axial oil duct (9).

2. A rotor assembly as claimed in claim 1, wherein: at least one rotor oil guide plate (11) is clamped in the rotor iron core (17), and the radial oil groove B (12) is arranged on the rotor oil guide plate (11).

3. A rotor assembly as claimed in claim 2, wherein: the rotor oil guide plate (11) is positioned in the middle of the rotor iron core (17), and the radial oil grooves B (12) are equidistantly arranged in a plurality of channels along the circumferential direction.

4. A rotor assembly as claimed in claim 1, wherein: an axial oil way B (20) is further arranged on the rotor core (17), and one end of the axial oil way B (20) is communicated with the radial oil groove B (12).

5. A rotor assembly as claimed in claim 5, wherein: the two ends of the rotor core (17) are respectively provided with a rotor end plate (18), the rotor end plates (18) are provided with oil channels (19), and one ends of the oil channels (19) are communicated with the other ends of the axial oil channels B (20).

6. A rotor assembly as claimed in claim 6, wherein: two ends of the oil duct (19) are respectively positioned at two sides of the rotor end plate (18), and one end of the oil duct (19) communicated with the axial oil path B (20) is closer to the rotor shaft (8) than the other end of the oil duct (19).

7. The utility model provides an oil cooling motor, includes casing (1), sets up the stator module in casing (1) and rotates the rotor module who is connected with casing (1) both ends, its characterized in that: the rotor assembly according to any one of claims 1 to 7.

8. An oil-cooled electric machine as set forth in claim 7, wherein: the stator assembly comprises a stator core (3) and windings (15), wherein winding grooves (7) are formed in the stator core (3), the windings (15) are inserted into the winding grooves (7), a circle of grooves are formed in the side wall of the stator core (3), a stator oil inlet (2) is formed in the side wall of the casing (1), the stator oil inlet (2) is communicated with the grooves, and at least one axial oil way A (4) is formed in each of the two side walls of the grooves.

9. An oil-cooled electric machine as set forth in claim 8, wherein: the two ends of the stator iron core (3) are respectively provided with an oil guide ring (16), the oil guide rings (16) are communicated with the axial oil way A (4), and the side wall of each oil guide ring (16) is provided with an oil injection hole facing the winding (15).

10. An oil-cooled electric machine as set forth in claim 8, wherein: at least one stator oil guide plate (5) is clamped in the stator core (3), a radial oil groove A (6) is formed in the stator oil guide plate (5), and the radial oil groove A (6) is communicated with the groove.