CN221042440U - Axial flux electric machine - Google Patents

Abstract

The application discloses an axial flux motor, which comprises a shell, a rotor shaft and a rotor disc, wherein the shell is provided with a cavity, and an oil return port and an oil inlet which are communicated with the cavity are formed in the shell; the rotor shaft is rotationally connected with the shell; the rotor disc is arranged in the cavity, sleeved on the rotor shaft and fixedly connected with the rotor shaft, magnetic steel is arranged on the rotor disc, and an oil outlet communicated with the cavity is also arranged on the rotor disc; the motor is provided with a cooling channel which is connected with the oil inlet and extends to the rotor disc through the shell and the rotor shaft to be connected with the oil outlet. Through the scheme, the cooling of the inside of the motor can be realized by a smaller shell volume.

Description

Axial flux electric machine

Technical Field

The application relates to the technical field of motors, in particular to an axial flux motor.

Background

The motor is used as a core technology of new energy industry, is gradually developed in the directions of integration, light weight and low cost, and the axial flux motor has the advantages of small volume, high torque, high power density, high efficiency and the like, and is widely applied to the fields of automobiles, aviation and the like. When the motor is in operation, heat generated in the stator is conducted to the casing or the rotor.

In the prior art, redundancy is designed aiming at the cooling scheme of the axial flux motor, and the overall volume requirement of the shell is larger, so that the advantages of the axial flux motor product are reduced.

Disclosure of utility model

The application mainly solves the technical problem of providing an axial flux motor, which realizes the cooling of the interior of the motor by a smaller shell volume.

In order to solve the technical problems, the application adopts a technical scheme that: the axial flux motor comprises a shell, a rotor shaft and a rotor disc, wherein the shell is provided with a cavity, and an oil return port and an oil inlet which are communicated with the cavity are formed in the shell; the rotor shaft is rotationally connected with the shell; the rotor disc is arranged in the cavity, sleeved on the rotor shaft and fixedly connected with the rotor shaft, magnetic steel is arranged on the rotor disc, and an oil outlet communicated with the cavity is also arranged on the rotor disc; the motor is provided with a cooling channel, and the cooling channel is connected with the oil inlet, extends to the rotor disc through the shell and the rotor shaft and is connected with the oil outlet.

Preferably, the cooling channel comprises a first cooling channel and a second cooling channel, and the first cooling channel is arranged on the shell and is communicated with the oil inlet; the first cooling channel includes a first annular groove disposed around the rotor shaft; the second cooling passage is provided on the rotor shaft, and the second cooling passage communicates with the first annular groove.

Preferably, the cooling channels include a third cooling channel provided on the rotor disk; the second cooling channel comprises a first sub cooling channel, a second sub cooling channel and a third sub cooling channel which are sequentially communicated, the second sub cooling channel extends along the axial direction of the rotor shaft, two ends of the first sub cooling channel are respectively communicated with the first annular groove and the second sub cooling channel, and two ends of the third sub cooling channel are respectively communicated with the second sub cooling channel and the third cooling channel.

Preferably, the rotor shaft includes a rotor shaft body and a mounting plate for fixing the rotor disk, the third sub-cooling passage is provided in the mounting plate, and the third sub-cooling passage extends in a radial direction of the mounting plate.

Preferably, a bearing groove is formed in the shell, a bearing is arranged between the bearing groove and the rotor shaft, the second cooling channel further comprises a fourth sub cooling channel, and two ends of the fourth sub cooling channel are respectively communicated with the bearing groove and the second sub cooling channel.

Preferably, the periphery of the rotor shaft is provided with a second annular groove, the second annular groove is communicated with the oil inlet, two ends of the first sub cooling channel are respectively communicated with the second annular groove and the second sub cooling channel, and the extending direction of the first sub cooling channel and the axial and radial included angles of the rotor shaft are acute angles.

Preferably, a plurality of the magnetic steels are arranged at intervals along the circumferential direction of the rotor disk, and a plurality of the third cooling channels are arranged at intervals and positioned between two adjacent magnetic steels.

Preferably, a stator is fixed in the cavity, and the oil outlet is arranged towards the stator.

Preferably, the third sub-cooling channel forms the second sub-oil outlet on the end surface of the mounting plate, the rotor disc is fixed on the end surface, and the second sub-oil inlet is located on the side of the rotor disc facing the end surface.

Preferably, a plug is arranged on the rotor shaft, and the plug is detachably connected to one end of the second sub cooling channel.

The beneficial effects of the application are as follows: in comparison with the prior art, the axial flux motor provided by the application is provided with the cooling channel inside the motor, the cooling channel extends along the shell, the rotor shaft and the rotor disc, so that a cooling medium can enter the inside of the motor through the oil inlet, leave the rotor disc from the oil outlet to enter the cavity after passing through the cooling channel, and finally leave the motor through the oil return port to realize circulation of the cooling medium. The cooling channel passes through the inside of the rotor disc, so that the magnetic steel fixed on the rotor disc can be indirectly cooled; meanwhile, when the rotor disk rotates, the cooling medium in the cooling channel can splash away from the rotor disk by virtue of centrifugal force and is sprayed to the stator and other structures in the cavity for direct cooling. The application integrates the cooling channel on the motor, realizes cooling without increasing the volume of the shell, has small volume, high integration level and high reliability, and has wider application and operation range in the field of passenger vehicles.

Drawings

FIG. 1 is a schematic structural view of an embodiment of an axial-flux motor of the present application;

FIG. 2 is a schematic view of a partial structure of an axial-flux motor of the present application at another angle;

FIG. 3 is a partial cross-sectional view of the housing of the present application;

FIG. 4 is a schematic structural view of the rotor shaft of the present application;

FIG. 5 is a schematic view of the structure of a rotor disk of the present application;

FIG. 6 is a schematic structural view of another embodiment of an axial-flux motor of the present application;

Fig. 7 is a schematic structural view of another embodiment of the rotor shaft of the present application.

Detailed Description

In order to make the objects, technical solutions and effects of the present application clearer and more specific, the present application will be described in further detail below with reference to the accompanying drawings and examples. It will be apparent that the described embodiments are only some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1, fig. 1 is a schematic structural view of an axial flux electric machine according to an embodiment of the present application, and fig. 2 is a schematic partial structural view of an axial flux electric machine according to another embodiment of the present application at another angle. The motor 10 comprises a shell 1, a rotor shaft 2 and a rotor disc 3, wherein the shell 1 is provided with a cavity 11, an oil inlet (not shown) and an oil return port 1c which are communicated with the cavity 11 are arranged on the shell 1, the oil inlet can be arranged on the end face of the shell 1, the oil inlet can be connected with an oil supply device, and the oil return port 1c can be connected with a circulating treatment device; the rotor shaft 2 is rotationally connected with the shell 1; the rotor disc 3 is arranged in the cavity 11, the rotor disc 3 is sleeved on the rotor shaft 2 and is fixedly connected with the rotor shaft 2, specifically, the rotor disc 3 can be locked with the rotor shaft 2 through bolts, so that the rotor shaft 2 can drive the rotor disc 3 to rotate on the shell 1, magnetic steel (not shown) is arranged on the rotor disc 3, the magnetic steel is embedded on the surface of the rotor disc 3, and the rotor disc 3 is also provided with an oil outlet 3c communicated with the cavity 11; the motor 10 is provided with a cooling channel T (see arrow in fig. 2), and the cooling channel T is connected with the oil inlet and extends to the rotor disc 3 through the housing 1 and the rotor shaft 2 to be connected with the oil outlet 3 c.

The axial flux motor provided by the application is provided with the cooling channel T inside the motor 10, the cooling channel T extends along the shell 1, the rotor shaft 2 and the rotor disc 3, so that a cooling medium (such as cooling oil) can enter the inside of the motor 10 through the oil inlet, and after sequentially passing through the shell 1, the rotor shaft 2 and the rotor disc 3 of the motor 10 along the cooling channel T, the cooling medium leaves the rotor disc 3 from the oil outlet 3c and enters the cavity 11, and finally leaves the motor 10 through the oil return port 1c to realize circulation of the cooling medium. The cooling channel T passes through the inside of the rotor disc 3, so that the magnetic steel fixed on the rotor disc 3 can be indirectly cooled; meanwhile, when the rotor disk 3 rotates, the cooling medium in the cooling channel T may splash away from the rotor disk 3 by centrifugal force, and be sprayed to the stator in the cavity 11 or the like for direct cooling. The cooling channel T is integrated on the motor 10, cooling is realized under the condition of not increasing the volume of the shell 1, the motor 10 has small volume, high integration level and high reliability, and the application and the operation range in the field of passenger vehicles are wider.

Alternatively, the cooling channel T includes a first cooling channel T1 and a second cooling channel T2, referring to fig. 3, fig. 3 is a partial cross-sectional view of the housing of the present application. The first cooling channel T1 is arranged on the shell 1 and is communicated with the oil inlet; the first cooling channel T1 comprises a first annular groove 1b, the first annular groove 1b is arranged around the rotor shaft 2, optionally, the first cooling channel T1 also comprises an oil inlet channel 1a arranged on the shell 1, and two ends of the oil inlet channel 1a are respectively communicated with the oil inlet and the first annular groove 1b; the second cooling passage T2 is provided on the rotor shaft 2, and the second cooling passage T2 communicates with the first annular groove 1 b. The cooling medium enters the oil inlet passage 1a through the oil inlet and then enters the first annular groove 1b for oil storage, and the rotor shaft 2 can be made to enter the second cooling passage T2 in the rotor shaft 2 no matter where the rotor shaft 2 rotates.

Optionally, referring to fig. 2, the cooling channels T further include a third cooling channel T3 provided on the rotor disk 3; the second cooling channel T2 includes a first sub cooling channel 2a, a second sub cooling channel 2b and a third sub cooling channel 2c that are sequentially communicated, the second sub cooling channel 2b extends along the axial direction of the rotor shaft 2, two ends of the first sub cooling channel 2a are respectively communicated with the first annular groove 1b and the second sub cooling channel 2b, and two ends of the third sub cooling channel 2c are respectively communicated with the second sub cooling channel 2b and the third cooling channel T3. The cooling medium passes through the first cooling channel T1 and then enters the second cooling channel T2, the second cooling channel T2 is located in the rotor shaft 2, wherein the cooling medium passes through the first sub cooling channel 2a and enters the second sub cooling channel 2b, flows into the third sub cooling channel 2c along the axial direction of the rotor shaft 2, and finally enters the third cooling channel T3 in the rotor disk 3.

Alternatively, referring to fig. 4, fig. 4 is a schematic structural view of the rotor shaft of the present application. The rotor shaft 2 includes a rotor shaft body 21 and a mounting plate 22 for fixing the rotor disk 3, the rotor shaft body 21 extends in the axial direction, the second sub-cooling passage 2b is located in the rotor shaft body 21, the third sub-cooling passage 2c is provided in the mounting plate 22, and the third sub-cooling passage 2c extends in the radial direction of the mounting plate 22. The mounting plate 22 circumferentially surrounds the rotor shaft body 21 and radially protrudes out of the rotor shaft body 21. Alternatively, referring to fig. 2, the third sub-cooling passage 2c communicates to an end surface of the mounting plate 22, the rotor disk 3 is fixed to the end surface, and one side of the mounting plate 22 may be fitted to the end surface of the rotor disk 3 and locked to both by bolts.

Optionally, with continued reference to fig. 2 and 4, the housing 1 is provided with a bearing groove 12, a bearing 5 is provided between the bearing groove 12 and the rotor shaft 2, and the second cooling channel T2 further includes a fourth sub cooling channel 2d, and two ends of the fourth sub cooling channel 2d are respectively communicated with the bearing groove 12 and the second sub cooling channel 2b. The fourth sub-cooling passage 2d is used to introduce the cooling medium of the second sub-cooling passage 2b into the bearing groove for lubricating and cooling the bearing 5.

Alternatively, referring to fig. 1, two first cooling passages T1 may be provided, which are respectively provided at both sides of the housing 1, specifically, the housing 1 includes a first housing 12 and a second housing 13 arranged in an axial direction, which are surrounded to form a cavity 11 inside, and the two first cooling passages T1 are respectively provided on the first housing 12 and the second housing 13, so that a cooling medium may enter the motor 10 from both sides, increasing cooling efficiency. The corresponding first sub-cooling channel 2a and fourth sub-cooling channel 2d may also be provided in two, respectively connected to two ends of the second sub-cooling channel 2b, wherein the two first sub-cooling channels 2a are respectively used for communicating with the two first cooling channels T1, and the two sub-cooling channels 2d are used for lubricating the two bearings 5. In other embodiments, the first cooling passage T1, the first sub-cooling passage 2a, and the fourth sub-cooling passage 2d may be provided on only one side.

Optionally, with continued reference to fig. 4, a plug 23 is further provided on the rotor shaft 2, and the plug 23 is detachably connected to one end of the second sub-cooling channel 2 b. The plug 23 is used to block the second sub-cooling channel 2b, forming a closed channel, preventing the cooling medium from leaving the rotor shaft 2.

Alternatively, referring to fig. 5, fig. 5 is a schematic structural view of the rotor disk of the present application. The magnetic steels 31 are arranged at intervals along the circumferential direction of the rotor disk 3, and the third cooling channels T3 are arranged at intervals and are positioned between two adjacent magnetic steels 31. The third cooling passage T3 may indirectly cool the magnetic steel 31 located at both sides. In the present embodiment, the third cooling passage T3 extends in the radial direction of the rotor disk 3 from the center to the edge of the rotor disk 3. In other embodiments, the third cooling channel T3 may also extend along an S shape, so as to increase the length of the third cooling channel T3 and improve the cooling effect. In the present embodiment, only two third cooling passages T3 are provided, which are positioned on the same straight line. In other embodiments, the third cooling channel T3 may also be disposed between any two magnetic steels 31.

Optionally, with continued reference to fig. 1 and 2, a stator 4 is fixed within the cavity 11, and the oil outlet 3c is disposed toward the stator 4. In this embodiment, the number of the rotor discs 3 is one, the number of the stators 4 is two, the stators are respectively arranged at two axial sides of the rotor discs 3, a plurality of oil outlets 3c are respectively arranged at two sides of the rotor discs 3, and the cooling medium is directly sprayed onto the stators 4 after leaving the rotor discs 3 from the oil outlets 3c, so that the stators 4 are directly cooled.

Alternatively, referring to fig. 6, fig. 6 is a schematic structural view of another embodiment of an axial-flux motor of the present application. In the present embodiment, the number of rotor disks 3 is two, the number of stators 4 is two, and two stators 4 are provided between two rotor disks 3. The oil outlets 3c of the two rotor discs 3 are arranged opposite to each other, and the oil outlets 3c on each rotor disc 3 are arranged on the same side so as to realize direct cooling of the two stators 4.

Alternatively, referring to fig. 7, fig. 7 is a schematic structural view of another embodiment of the rotor shaft of the present application. The periphery of the rotor shaft 2 is provided with a second annular groove 2e, the second annular groove 2e is communicated with an oil inlet, two ends of a first sub cooling channel 2d are respectively communicated with the second annular groove 2e and a second sub cooling channel 2b, and the extending direction of the first sub cooling channel 2d and the axial and radial included angles of the rotor shaft 2 are acute angles. Specifically, the second annular groove 2e can be communicated with the oil inlet through the oil inlet channel 1a, the first annular groove 1b is not arranged on the shell 1, and at the moment, the second annular groove 2e can replace the action of the first annular groove 1b, so that no matter what position the rotor shaft 2 rotates to, the cooling medium can enter the rotor shaft 2. In other embodiments, the first annular groove 1b is provided on the housing 1, and the second annular groove 2e surrounds the first annular groove 1b to form an annular channel with a larger cross section, so that more cooling medium can be stored. Because the first sub cooling channel 2d is arranged in the radial inclination of the rotor shaft 2, and the first sub cooling channel 2d is also arranged in the axial inclination of the rotor shaft 2, the cooling medium can absorb oil independently when the rotor shaft 2 rotates, so that the cooling medium can enter the second sub cooling channel 2b independently through the second annular groove 2e and the first sub cooling channel 2d, the rotation of the rotor shaft 2 is utilized to provide oil absorption power, a driving device is not required to be additionally arranged, the cost is saved, the rotation of the rotor shaft 2 is stopped, the oil absorption can be stopped, and the control is convenient. The first sub-cooling passage 2d may be provided in plural, and the plural inclined directions may be kept uniform.

The foregoing is only the embodiments of the present application, and therefore, the patent scope of the application is not limited thereto, and all equivalent structures or equivalent processes using the descriptions of the present application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the application.

Claims (10)

1. An axial flux electric machine, comprising:

The shell is provided with a cavity, and an oil inlet and an oil return port which are communicated with the cavity are formed in the shell;

The rotor shaft is rotationally connected with the shell;

The rotor disc is arranged in the cavity, sleeved on the rotor shaft and fixedly connected with the rotor shaft, magnetic steel is arranged on the rotor disc, and an oil outlet communicated with the cavity is also formed in the rotor disc;

The motor is provided with a cooling channel, and the cooling channel is connected with the oil inlet, extends to the rotor disc through the shell and the rotor shaft and is connected with the oil outlet.

2. The axial flux electric machine of claim 1, wherein,

The cooling channel comprises a first cooling channel and a second cooling channel, and the first cooling channel is arranged on the shell and is communicated with the oil inlet;

The first cooling channel includes a first annular groove disposed around the rotor shaft;

The second cooling passage is provided on the rotor shaft, and the second cooling passage communicates with the first annular groove.

3. The axial flux electric machine of claim 2, wherein,

The cooling channels include a third cooling channel disposed on the rotor disk;

The second cooling channel comprises a first sub cooling channel, a second sub cooling channel and a third sub cooling channel which are sequentially communicated, the second sub cooling channel extends along the axial direction of the rotor shaft, two ends of the first sub cooling channel are respectively communicated with the first annular groove and the second sub cooling channel, and two ends of the third sub cooling channel are respectively communicated with the second sub cooling channel and the third cooling channel.

4. An axial flux electric machine as defined in claim 3, wherein,

The rotor shaft comprises a rotor shaft body and a mounting plate for fixing the rotor disc, the third sub-cooling channel is arranged in the mounting plate, and the third sub-cooling channel extends along the radial direction of the mounting plate.

5. An axial flux electric machine as defined in claim 3, wherein,

The bearing groove is formed in the shell, a bearing is arranged between the bearing groove and the rotor shaft, the second cooling channel further comprises a fourth sub cooling channel, and two ends of the fourth sub cooling channel are respectively communicated with the bearing groove and the second sub cooling channel.

6. An axial flux electric machine as defined in claim 3, wherein,

The outer periphery of the rotor shaft is provided with a second annular groove, the second annular groove is communicated with the oil inlet, two ends of the first sub cooling channel are respectively communicated with the second annular groove and the second sub cooling channel, and the extending direction of the first sub cooling channel and the axial and radial included angles of the rotor shaft are acute angles.

7. An axial flux electric machine as defined in claim 3, wherein,

The magnetic steels are arranged at intervals along the circumferential direction of the rotor disk, and the third cooling channels are arranged at intervals and positioned between two adjacent magnetic steels.

8. The axial flux electric machine of claim 2, wherein,

The cavity is internally fixed with a stator, and the oil outlet is arranged towards the stator.

9. The axial flux electric machine of claim 4, wherein,

The third sub-cooling passage extends to an end face of the mounting plate, and the rotor disk is fixed on the end face.

10. An axial flux electric machine as defined in claim 3, wherein,

And the rotor shaft is provided with a plug which is detachably connected with one end of the second sub cooling channel.