Air-cooled axial flux motor

Abstract

The invention provides an air-cooled axial flux motor. The air-cooled axial flux motor comprises a rotating shaft, a stator, a first rotor and a second rotor, two ends of the motor shell are respectively provided with a first air vent and a second air vent; each rotor comprises a rotor disc and a magnetic steel assembly; a plurality of radial flow fan blades are arranged on the side, away from the stator, of the rotor disc in the circumferential direction, and a first air channel is formed between every two adjacent radial flow fan blades. The rotor disc is provided with air passing holes in one-to-one correspondence with the first air ducts, and the air passing holes are axially communicated with the stator shaft hole; the radial flow fan blades on the two rotor discs are configured to be installed in the back-to-back direction. Therefore, when the motor works, a radial-axial-radial airflow cooling path can be formed in the motor shell, so that direct air cooling of the stator and the rotor is realized; the fan blades are completely integrated in the motor and are driven by the rotation of the rotor, so that the dependence on an external fan is effectively eliminated, and the increase of an additional mounting space is avoided; and the self-adaptive adjustment of the cooling intensity can be realized.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of electric machines, and particularly relates to a wind-cooled axial flux motor. BACKGROUND

[0002] Axial flux motors are widely used in electric vehicles, aerospace, robots and other occasions requiring compact space and high power density due to their advantages of flat shape, compact structure and high power density, and have broad application prospects. However, as the power of axial flux motors increases, the heat generated also increases, making the cooling design of axial flux motors extremely important.

[0003] Currently, axial flux motors mainly achieve shell cooling by setting a cooling channel in the motor shell, circulating cooling liquid in the cooling channel, and then using the heat transfer between the cooled shell and the stator and rotor to achieve indirect cooling of the stator and rotor. This cooling scheme cannot directly cool the stator and rotor, and the cooling effect is poor.

[0004] In order to improve the cooling effect, the utility model patent with application number 2023211403087 discloses a forced air-cooled coreless axial magnetic field motor, wherein the side of the rotor close to the stator is uniformly provided with ventilation grooves along the radial direction; the rotating shaft is a hollow shaft, and the rotating shaft is provided with air inlet holes corresponding to the ventilation grooves; the annular shell of the front cover is uniformly provided with exhaust grooves, and the side of the rear cover is provided with a first exhaust hole, which is in communication with an external exhaust type cooling fan; in this way, only the exhaust type cooling fan needs to be started to exhaust air, and the hot air in the motor will be exhausted to form a negative pressure, at this time, the cold air in the external environment will enter the corresponding ventilation grooves through the axial center through hole and the radial air inlet hole of the rotating shaft, and the air entering the ventilation grooves will cool the adjacent stator, and also cool the rotor itself, thereby achieving direct cooling of the stator and rotor. The heated air enters the exhaust groove through the air gap between the stator and the rotor, and finally is discharged outside the motor through the first exhaust hole, completing the air cooling of the motor. Although the motor cooling scheme adopted by this patent can achieve direct cooling of the stator and rotor, the cooling system completely relies on the external exhaust type cooling fan, and once the exhaust type cooling fan fails, the entire cooling system fails, reducing the cooling reliability. In addition, the external exhaust type cooling fan requires additional fan installation space, which is contrary to the original design intention of compactness of the axial flux motor. Finally, when the axial flux motor operates under low load conditions, the external exhaust type cooling fan will cause excessive cooling of the motor, resulting in unnecessary energy consumption. SUMMARY

[0005] In view of the above shortcomings of the prior art, the purpose of the present application is to provide a wind-cooled axial flux motor that can achieve direct cooling of the stator and rotor without additional cooling fans.

[0006] To achieve the above object and other related objects, the present application provides an air-cooled axial flux motor, comprising a rotating shaft, a stator, a first rotor and a second rotor; the rotating shaft is rotatably installed on a motor shell; the stator is fixedly installed in the motor shell, and the stator has a stator shaft hole through which the rotating shaft passes; the first rotor and the second rotor are respectively located on both sides of the stator, and each rotor is fixedly sleeved on the rotating shaft; the motor shell is provided with a first air inlet and a second air inlet at two ends thereof; each rotor comprises a rotor disc and a magnetic steel assembly; a plurality of radial flow fan blades are arranged on the side of the rotor disc away from the stator in a circumferential direction, and a first air duct is formed between any two adjacent radial flow fan blades; the rotor disc is provided with a wind passing hole corresponding to the first air duct, and the wind passing hole is in axial communication with the stator shaft hole; the radial flow fan blades on the two rotor discs are configured to be reversely installed back to back; in this way, when the air-cooled axial flux motor is working, the external cold air is sucked into the motor shell and flows along the first air duct of one rotor to the central area of the rotor, then the air flows axially through the stator shaft hole into the first air duct of the other rotor and flows radially outward in the first air duct until it is discharged from the motor shell, so as to form a radial-axial-radial air flow cooling path, thereby realizing direct air cooling of the stator and the rotor; since the fan blades of the present application are completely integrated in the motor and are driven by the rotation of the rotor itself, the dependence on external fans is effectively eliminated, not only the cooling reliability is effectively improved, but also the increase of additional installation space is avoided; at the same time, the present application can also realize adaptive adjustment of cooling strength, avoiding the situation of low load overcooling waste.

[0007] Preferably, the radial flow fan blade has a centripetal surface and an anticentripetal surface, the centripetal surface is used to drive the air to move radially inward, and the anticentripetal surface is used to drive the air to move radially outward; in this way, only the radial flow fan blade needs to be driven to rotate forward or reverse, so that the air can move radially inward or radially outward along the rotor disc.

[0008] Preferably, the radial flow fan blade is a curved plate structure.

[0009] Preferably, the rotor disc comprises a rotor disc body and a shaft hub arranged coaxially, the magnetic steel assembly and the radial flow fan blade are installed on the rotor disc body; a plurality of connecting pieces connected with the rotor disc body are arranged on the outer periphery of the shaft hub, and a wind passing hole is formed between any two adjacent connecting pieces.

[0010] Preferably, the connecting piece on at least one rotor disc body is an axial flow fan blade; when the air-cooled axial flux motor is working, the axial flow fan blades on each rotor disc are configured to drive the air to flow axially to flow through the wind passing holes on the two rotor discs in turn; the setting of the axial flow fan blade can increase the axial flow rate of the air, thereby improving the cooling efficiency of the stator.

[0011] Preferably, the motor housing includes a housing and a cover; the cover is detachably mounted on the housing to facilitate the replacement and maintenance of components inside the housing.

[0012] Preferably, a stop is fixed on the inner wall of the housing, and the housing cover is used to press the stator against the stop to achieve relative fixation between the stator and the motor housing.

[0013] Preferably, both the first vent and the second vent are located on the housing, or the first vent is located on the housing cover and the second vent is located on the housing.

[0014] Preferably, the rotating shaft includes a first rotating shaft and a second rotating shaft that are separately configured; the first rotating shaft and the second rotating shaft are detachably connected to improve assembly convenience and flexibility.

[0015] Preferably, the stator is a coreless stator.

[0016] As described above, the air-cooled axial flux motor provided by the present invention has the following beneficial effects:

[0017] This invention features radial flow fan blades mounted in opposite directions on two rotor disks, with an air passage hole connected to the stator shaft hole in the central region of the rotor disks. When the air-cooled axial flux motor is operating, external cold air is drawn into the motor housing and flows radially inward to the central region of one rotor under the action of the radial flow fan blades. Subsequently, the air flows axially through the stator shaft hole into the central region of the other rotor, and then flows radially outward under the action of the radial flow fan blades of the other rotor until it exits the motor housing, forming a radial-axial-radial airflow cooling path, thereby achieving direct air cooling of the stator and rotor. Since the fan blades are fully integrated inside the motor and driven by the rotor's own rotation, dependence on an external fan is effectively eliminated, significantly improving cooling reliability and avoiding additional installation space, thus meeting the compact design requirements of axial flux motors. Furthermore, since the airflow velocity is directly related to the motor speed, this invention enables adaptive adjustment of cooling intensity, avoiding waste due to overcooling under low loads.

[0018] When at least one of the connecting parts on the rotor disk is an axial flow fan blade, it can accelerate the axially flowing air to improve the heat exchange efficiency of the stator, thereby improving the heat dissipation capacity of the motor. Attached Figure Description

[0019] Figure 1 This is a perspective view of the air-cooled axial flux motor in this application from a first-view perspective.

[0020] Figure 2 This is a perspective view of the air-cooled axial flux motor in this application from a second-view perspective.

[0021] Figure 3 This is a main cross-sectional view of the air-cooled axial flux motor in this application.

[0022] Figure 4 for Figure 3 A magnified view of a portion at point A.

[0023] Figure 5 This is a three-dimensional exploded view of the air-cooled axial flux motor in this application.

[0024] Figure 6 This is a three-dimensional exploded view of the first rotor in this application.

[0025] Figure 7 This is a three-dimensional exploded view of the second rotor in this application.

[0026] Figure 8 This is a schematic diagram of the structure of the radial fan blade assembly mounted on the rotor disk.

[0027] Figure 9 This is a diagram showing the state of air flowing radially inwards as the radial fan blades on the rotor disk drive the airflow.

[0028] Figure 10 This is a diagram showing the state of air flowing radially outwards driven by the radial fan blades on the rotor disk.

[0029] Figure 11 This is a partial cross-sectional view of the first and second rotors in their assembled state.

[0030] Figure 12 This is a diagram showing the state of the axial fan blades driving the air to flow axially from left to right when the motor is rotating forward.

[0031] Figure 13 This is a diagram showing the state of the axial fan blades driving air to flow axially from right to left when the motor is in reverse.

[0032] Figure 14 A schematic diagram of airflow inside the motor housing when the motor is rotating forward.

[0033] Figure 15 This is a schematic diagram of the airflow inside the motor housing when the motor reverses.

[0034] Figure 16 This is an exploded 3D view of the shell and the shielding cover.

[0035] Explanation of reference numerals in the attached figures

[0036] Rotating shaft 10, first rotating shaft 11, second rotating shaft 12;

[0037] Stator 20;

[0038] First rotor 30a, second rotor 30b, rotor disk 31, rotor disk body 311, hub 312, connector 313, first drive surface 313a, second drive surface 313b, air passage 31a, magnet assembly 32, radial fan blade 33, centripetal surface 331, vestibular surface 332, first air duct 34.

[0039] Motor housing 40, housing 41, stop 411, housing cover 42, shield cover 43;

[0040] First ventilation opening 50a, second ventilation opening 50b;

[0041] Bearing 60, limit ring 70, cable outlet assembly 80, positioning post 91, positioning hole 92. Detailed Implementation

[0042] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0043] Please see Figures 1 to 16 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0044] like Figures 1 to 7 As shown, the air-cooled axial flux motor provided by the present invention includes a rotating shaft 10, a stator 20, a first rotor 30a, a second rotor 30b, a motor housing 40, and a cable outlet assembly 80; wherein,

[0045] The motor housing 40 is provided with a first vent 50a and a second vent 50b at its left and right ends, respectively. One of the first vent 50a and the second vent 50b is an air inlet and the other is an air outlet to facilitate the circulation of air inside the motor. To ensure the ventilation effect, multiple first vents 50a and multiple second vents 50b are provided. In this embodiment, multiple first vents 50a are evenly distributed around the central axis of the motor housing 40, and multiple second vents 50b are evenly distributed around the central axis of the motor housing 40.

[0046] The rotating shaft 10 is rotatably mounted on the motor housing 40 via the bearing 60.

[0047] The stator 20 is fixedly installed inside the motor housing 40, and the stator 20 has a stator shaft hole 21 through which the rotating shaft 10 passes; the stator 20 is a coreless stator or a stator with an iron core; in this embodiment, in order to reduce the axial dimension of the motor, the stator 20 is preferably a coreless stator.

[0048] The first rotor 30a and the second rotor 30b are located on the left and right sides of the stator 20, respectively, and each rotor is fixedly mounted on the rotating shaft 10; at this time, the first rotor 30a, the second rotor 30b and the rotating shaft 10 together constitute the rotor assembly.

[0049] Both the first rotor 30a and the second rotor 30b include a rotor disk 31, a magnet assembly 32, and a radial fan blade assembly arranged coaxially. The magnet assembly 32 is located on the side of the rotor disk 31 closer to the stator 20, and the radial fan blade assembly is located on the side of the rotor disk 31 away from the stator 20. The radial fan blade assembly includes multiple radial fan blades 33 arranged circumferentially, and a first air duct 34 is formed between two adjacent radial fan blades 33. The rotor disk 31 is provided with air passage holes 31a corresponding one-to-one with the first air duct 34, and the air passage holes 31a are connected to the stator shaft hole 21 in the axial direction. The radial fan blade assemblies on the two rotor disks 31 are configured to be installed back-to-back in opposite directions.

[0050] It should be noted that the meaning of the radial fan blade groups on the two rotor disks 31 being configured to be installed back to back in opposite directions is that the radial fan blade group on one rotor disk 31 can be obtained by rotating it 180° left and right.

[0051] Because the radial fan blades on the two rotor disks 31 are configured to be installed back-to-back in opposite directions, when the motor rotates (forward or reverse), the working directions of the two radial fan blades are completely opposite. That is, when one radial fan blade pushes the air radially inward to achieve radial suction, the other radial fan blade pushes the air radially outward to achieve radial exhaust. Since the radially moving air directly contacts the corresponding rotor disk 31 and carries away heat when the radial fan blades push the air radially, the air cooling effect of the rotor can be effectively guaranteed.

[0052] Furthermore, for ease of description, the radial fan blade group that achieves radial air intake is defined as the centripetal fan blade group, and the radial fan blade group that achieves radial air exhaust is defined as the centrifugal fan blade group. Because there is a pressure difference in the central regions of the centripetal and centrifugal fan blade groups (i.e., the air pressure in the central region of the centripetal fan blade group is higher than that in the central region of the centrifugal fan blade group), the air in the central region of the centripetal fan blade group will spontaneously flow through the stator shaft hole 21 towards the central region of the centrifugal fan blade group, thus achieving axial airflow. During this process, the axially flowing air will contact the inner ring of the stator 20 and carry away the heat from the stator 20, effectively ensuring the air-cooling effect of the stator 20.

[0053] Therefore, when the motor rotates (forward or reverse), the two radial fan blade groups can rotate synchronously and in the same direction, and the working directions of the two radial fan blade groups are always opposite. This facilitates the formation of a radial-axial-radial airflow cooling path within the motor housing 40 (the airflow cooling path is as follows). Figure 14 or Figure 15 (As shown by the red arrow), this design ensures that the flowing air not only makes full contact with each rotor disc 31 but also with the inner ring of the stator 20, achieving direct air cooling of the stator 20 and the two rotors. Since the fan blades of this application are fully integrated inside the motor and driven by the rotation of the rotor assembly itself, the dependence on an external fan is effectively eliminated. This not only effectively improves cooling reliability but also avoids the need for additional installation space, thus meeting the compact design requirements of axial flux motors. Simultaneously, because the airflow velocity is directly related to the motor speed, this application can achieve adaptive adjustment of cooling intensity, avoiding waste due to overcooling under low loads.

[0054] It should be noted that the multiple runoff fan blades 33 in the runoff fan blade group are evenly arranged in the circumferential direction to ensure rotational balance.

[0055] It should be noted that, such as Figures 8 to 10 As shown, the radial fan blade 33 has a centripetal surface 331 and a back surface 332; the radial fan blade 33 can drive the air to move radially inward through the centripetal surface 331 and also drive the air to move radially outward through the back surface 332; thus, by simply switching the rotation direction of the radial fan blade 33, the air can switch between radial inward movement and radial outward movement.

[0056] It is understood that the structure of the runoff fan blade 33 can be varied, including but not limited to any blade structure with a centripetal surface 331 and a back surface 332, such as a straight plate or a curved plate, and there is no limitation on this; in this embodiment, the runoff fan blade 33 is a curved plate structure.

[0057] In a more specific embodiment, such as Figure 8As shown, the runoff fan blade 33 is an arc-shaped blade. In this case, the concave surface of the arc-shaped blade is the centripetal surface 331, and the convex surface of the arc-shaped blade is the convex surface 332. Compared with straight blades, arc-shaped blades can effectively reduce turbulence and impact losses, thereby reducing noise.

[0058] like Figure 8 As shown, the rotor disk 31 includes a rotor disk body 311 and a hub 312 arranged coaxially; wherein, the rotor disk body 311 is used to install the magnet assembly 32 and the radial flow fan blade assembly; the rotor disk 31 is fixedly mounted on the rotating shaft 10 through the hub 312; a plurality of connecting parts 313 connected to the rotor disk body 311 are arranged on the outer periphery of the hub 312, and an air passage hole 31a is formed between two adjacent connecting parts 313, and the air passage hole 31a is used to allow axially flowing air to pass through.

[0059] It should be noted that because the stator windings are relatively compactly distributed in the inner ring of stator 20, the heat is concentrated in the inner ring of stator 20, making it difficult to dissipate heat. Therefore, in order to ensure the heat dissipation effect of stator 20, such as... Figure 5 and Figure 8 As shown, the diameter of the stator shaft hole 21 needs to be larger than the outer diameter of the hub 312 and not larger than the inner diameter of the rotor disk body 311 to ensure that the axially flowing air can fully contact the inner wall of the stator shaft hole 20. In this embodiment, the diameter of the stator shaft hole 21 is preferably larger than the outer diameter of the hub 312 and smaller than the inner diameter of the rotor disk body 311 to increase the contact area between the axially flowing air and the stator 20 and improve the heat dissipation effect of the stator 20.

[0060] To further improve heat dissipation, at least one of the connecting parts 313 on the rotor disk 31 is an axial fan blade, so that when the air-cooled axial flux motor is working, the axial fan blades on each rotor disk 31 are configured to accelerate the axial flow speed of the air, so that the air flows through the air passage holes 31a on the two rotor disks 31 at a faster speed.

[0061] It should be noted that, such as Figure 8 and Figure 11 As shown, the axial fan blades are inclined relative to the central axis of the rotor. In this way, the axial fan blades can switch between axial suction and axial exhaust states simply by changing the rotation direction of the axial fan blades.

[0062] It is understood that axial flow fan blades have a variety of structural forms, including but not limited to straight blades, curved blades and airfoil blades, and various blade structures that can drive the axial movement of air. There is no limitation on this. Considering the difficulty of processing, in this embodiment, straight blades are preferred for axial flow fan blades.

[0063] It should be noted that, such as Figures 12 to 13As shown, when the connecting parts 313 on both rotor disks 31 are axial flow fan blades, the axial flow fan blades on both rotor disks 31 have the same working direction. That is, regardless of whether the motor rotates forward or backward, the airflow direction of the axial flow fan blades on both rotor disks 31 is always the same, and both are directed towards the axial direction close to the centrifugal fan blade assembly. In this way, the axial flow fan blades on the two rotor disks 31 can be used to accelerate the axially flowing air a second time, allowing the air to contact and pass through the inner ring of the stator 20 at a faster speed, effectively improving the heat dissipation effect of the stator 20 and avoiding the risks of material degradation and motor performance degradation caused by heat accumulation in the inner ring of the stator.

[0064] In addition, the axial flow fan blades can accelerate the axial flow speed of air in the central area of ​​the rotor assembly, thereby accelerating the air flow speed inside the motor housing 40, improving the heat dissipation effect of the motor housing 40, further enhancing the heat dissipation capacity of the motor, and laying the foundation for the preparation of motors with higher power density.

[0065] Understandably, this is to facilitate the disassembly and maintenance of the various components inside the motor housing 40, such as... Figure 3 As shown, the motor housing 40 includes a housing 41 and a cover 42. The cover 42 is detachably fixed to the housing 41 by means of bolts, snap-fits, etc.

[0066] It is understood that the first vent 50a and the second vent 50b are respectively located on the outer walls at both ends of the housing 41, or the first vent 50a is located on the cover 42 and the second vent 50b is located on the end face of the housing 41 away from the cover 42; this is not limited. In this embodiment, the first vent 50a and the second vent 50b are respectively located on the outer walls at both ends of the housing 41 to ensure that air can flow radially into and out of the motor housing 41. In this way, the direction of air flowing into and out of the motor housing 41 can be matched with the air drive direction of the radial fan blades on the two rotors, effectively reducing the wind resistance problem caused by the sudden change in flow direction, increasing the air flow speed inside the motor housing 40, and ensuring the heat dissipation effect.

[0067] like Figure 3 and Figure 4 As shown, a stop 411 is formed and fixed on the inner wall of the housing 41. The cover 42 presses the stator 20 onto the stop 411 through the limiting ring 70 to achieve relative fixation between the stator 20 and the motor housing 41.

[0068] It is understood that the stop member 411 has a variety of structural shapes, including but not limited to various stop structures with stop surfaces such as circular rings, fan rings or square bodies; in this embodiment, the stop member 411 is preferably a fan ring fixed on the inner wall of the housing 41.

[0069] It is understood that the cover 42 and the limiting ring 70 can be integrally formed or separately set, and there is no limitation on this; in this embodiment, the cover 42 and the limiting ring 70 are preferably separately set.

[0070] It should be noted that the inner diameter of the limiting ring 70 must be larger than the outer diameter of the first rotor 30a to avoid interference between the rotor assembly and the limiting ring 70 when the rotor assembly rotates.

[0071] It is understood that the rotating shaft 10 involved in this application can be an integral structure or a split structure, and there is no limitation on this; in this embodiment, in order to facilitate disassembly and assembly, the rotating shaft 10 preferably adopts a split structure.

[0072] Specifically, such as Figure 3 As shown, the rotating shaft 10 includes a first rotating shaft 11 and a second rotating shaft 12 that are separately arranged; wherein, the first rotating shaft 11 and the second rotating shaft 12 are rotatably mounted on the cover 42 and the housing 41 respectively by bearings 60, and the first rotating shaft 11 and the second rotating shaft 12 are detachably connected together by bolts.

[0073] like Figure 3 As shown, in order to facilitate the bolt connection between the second rotating shaft 12 and the first rotating shaft 11, an operating port must be opened at the end of the housing 41 away from the cover 42 for the installation and removal of the bolts.

[0074] To cover the operating opening, such as Figure 5 and Figure 16 As shown, a cover 43 is detachably fixed to the end of the housing 41 away from the cover 42 by means of bolts, snap-fit, etc.; the cover 43 is used to cover the operating port to improve aesthetics.

[0075] In addition, such as Figure 16 As shown, the housing 41 is provided with a positioning post 91, and the cover 43 is provided with a positioning hole 92 that cooperates with the positioning post 91; the positioning and installation of the cover 43 is achieved by the cooperation of the positioning post 91 and the positioning hole 92.

[0076] In this application, as Figure 6 and Figure 7 As shown, the magnet assembly 32 includes N-pole magnets and S-pole magnets arranged alternately along the circumferential direction of the rotor disk 31, and the rotor disk 31 is provided with magnet mounting slots (not shown in the figure) for mounting each magnet.

[0077] It should be noted that the magnet mounting slots on the rotor disk 31 are not interconnected in the circumferential direction, or the magnet mounting slots on the rotor disk 31 are interconnected in the circumferential direction to form an annular mounting slot, which is not limited; when the magnet mounting slots on the rotor disk 31 are interconnected in the circumferential direction to form an annular mounting slot, an insulating connector is provided between two adjacent magnets in the magnet assembly 32.

[0078] It should be noted that the materials of the insulating connectors include, but are not limited to, epoxy resin or PPS and other existing insulating materials, in order to avoid magnetic short circuits and eddy current losses.

[0079] like Figure 9 , Figure 12 and Figure 14 As shown, when the air-cooled axial flux motor rotates forward (i.e., clockwise), the first rotor 30a and the second rotor 30b rotate synchronously. At this time, the radial fan blades on the first rotor 30a are centrifugal fan blades, and the radial fan blades on the second rotor 30b are centrifugal fan blades. The axial fan blades on both the first rotor 30a and the second rotor 30b are in an axial suction state that pushes air to move from left to right. Thus, when the radial fan blades on the first rotor 30a rotate forward, cold air from the outside enters the left end of the motor housing 40 through the first vent 50a and moves radially inward along the first air duct 34 on the first rotor 30a to the center of the first rotor 30a. The air in the central region of the first rotor 30a is axially flowed from left to right to the central region of the second rotor 30b under the action of the axial fan blades. During this process, the axially flowing air comes into contact with the inner ring of the stator 20 and carries away the heat of the stator 20. The air flowing to the central region of the second rotor 30b is radially moved outward along the first air duct 34 of the second rotor 30b under the action of the radial fan blades of the second rotor 30b, until it is discharged from the motor housing 40 through the second vent 50b at the right end, completing the air cooling of the second rotor 30b. Throughout the process, a cooling system is formed inside the motor housing 40, such as... Figure 14 The radial-axial-radial airflow cooling path indicated by the red arrow ensures that the air can fully contact the core heat-generating parts of each rotor and stator 20, effectively guaranteeing the air cooling effect.

[0080] like Figure 10 , Figure 13 and Figure 15As shown, when the air-cooled axial flux motor reverses (i.e., rotates counterclockwise), the first rotor 30a and the second rotor 30b also reverse synchronously. At this time, the radial fan blades on the first rotor 30a are centrifugal fan blades, and the radial fan blades on the second rotor 30b are centripetal fan blades. The axial fan blades on both the first rotor 30a and the second rotor 30b are in an axial exhaust state that pushes air from right to left. Thus, when the radial fan blades on the second rotor 30b follow the reverse rotation, outside cold air enters the right end of the motor housing 40 through the second vent 50b and moves radially inward along the first air duct 34 on the second rotor 30b to the center of the second rotor 30b. The air in the central region of the second rotor 30b is axially flowed from right to left to the central region of the first rotor 30a under the action of the axial fan blades. During this process, the axially flowing air comes into contact with the inner ring of the stator 20 and carries away the heat of the stator 20. The air flowing to the central region of the first rotor 30a is radially moved outward along the first air duct 34 of the first rotor 30a under the action of the radial fan blades of the first rotor 30a until it is discharged from the motor housing 40 through the first vent 50a at the left end, completing the air cooling of the first rotor 30a. Throughout the process, a cooling system is formed inside the motor housing 40, such as... Figure 14 The radial-axial-radial airflow cooling path indicated by the red arrow ensures that the air can fully contact the core heat-generating parts of each rotor and stator 20, effectively guaranteeing the air cooling effect.

[0081] In summary, this application provides radial fan blades 33 with opposite installation directions on two rotor disks 31, and axial fan blades with the same working direction in the central area of ​​the two rotor disks 31. Thus, when the air-cooled axial flux motor rotates forward or reverse, a radial-axial-radial airflow cooling path can be formed within the motor housing 40, achieving direct air cooling of the stator 20 and rotor. Since the fan blades are fully integrated inside the motor and driven by the rotor's own rotation, dependence on external fans is effectively eliminated, significantly improving cooling reliability and avoiding additional installation space, thus meeting the compact design requirements of axial flux motors. Furthermore, because the airflow velocity is directly related to the motor speed, this application enables adaptive adjustment of cooling intensity, avoiding waste due to overcooling under low loads. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial applicability.

[0082] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A wind-cooled axial flux motor, comprising a rotating shaft (10), a stator (20), a first rotor (30a), and a second rotor (30b); the rotating shaft (10) is rotatably mounted on a motor housing (40); the stator (20) is fixedly mounted inside the motor housing (40), and the stator (20) has a stator shaft hole (21) through which the rotating shaft (10) passes; the first rotor (30a) and the second rotor (30b) are respectively located on both sides of the stator (20), and each rotor is fixedly mounted on the rotating shaft (10); Its features are, The motor housing (40) has a first vent (50a) and a second vent (50b) at both ends respectively; each rotor includes a rotor disk (31) and a magnet assembly (32); a plurality of radial fan blades (33) are arranged circumferentially on the side of the rotor disk (31) away from the stator (20), and a first air duct (34) is formed between two adjacent radial fan blades (33); the rotor disk (31) is provided with air passage holes (31a) corresponding to the first air duct (34), and the air passage holes (31a) are axially connected to the stator shaft hole (21); the radial fan blades (33) on the two rotor disks (31) are configured to be installed back to back in opposite directions.

2. The air-cooled axial flux motor according to claim 1, characterized in that, The radial fan blade (33) has a centripetal surface (331) and a back surface (332), the centripetal surface (331) being used to drive air to move radially inward, and the back surface (332) being used to drive air to move radially outward.

3. The air-cooled axial flux motor according to claim 2, characterized in that, The runoff fan blade (33) is an arc-shaped blade.

4. A wind-cooled axial flux motor according to claim 1, 2, or 3, characterized in that, The rotor disk (31) includes a rotor disk body (311) and a hub (312) arranged coaxially. The magnet assembly (32) and the radial fan blade (33) are mounted on the rotor disk body (311). The outer periphery of the hub (312) is provided with a plurality of connectors (313) connected to the rotor disk body (311), and an air passage hole (31a) is formed between two adjacent connectors (313).

5. A wind-cooled axial flux motor according to claim 4, characterized in that, At least one of the connecting parts (313) on the rotor disk (31) is an axial flow fan blade; when the air-cooled axial flux motor is working, the axial flow fan blades on each rotor disk (31) are configured to drive the air to flow axially so that the air flows through the air passage holes (31a) on the two rotor disks (31) in sequence.

6. A wind-cooled axial flux motor according to claim 1 or 2, characterized in that, The motor housing (40) includes a housing (41) and a cover (42); the cover (42) is detachably mounted on the housing (41).

7. A wind-cooled axial flux motor according to claim 6, characterized in that, A stop (411) is fixed on the inner wall of the housing (41), and the cover (42) is used to press the stator (20) onto the stop (411).

8. A wind-cooled axial flux motor according to claim 6, characterized in that, The first vent (50a) and the second vent (50b) are both located on the housing (41), or the first vent (50a) is located on the cover (42) and the second vent (50b) is located on the housing (41).

9. A wind-cooled axial flux motor according to claim 6, characterized in that, The rotating shaft (10) includes a first rotating shaft (11) and a second rotating shaft (12) that are separately configured; the first rotating shaft (11) and the second rotating shaft (12) are detachably connected.

10. A wind-cooled axial flux motor according to claim 1, characterized in that, The stator (20) is a coreless stator.

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