Axial flux motor

Abstract

The utility model relates to an axial flux motor. The axial flux motor comprises a motor shell, a first stator assembly and a second stator assembly fixedly arranged in the motor shell, a rotor assembly arranged between the first stator assembly and the second stator assembly, and a motor shaft. The motor shell is internally formed with a heat dissipation flow channel; a plurality of first through holes and a plurality of second through holes in communication with the heat dissipation flow channel are respectively formed on the first stator assembly and the second stator assembly, and the axial flux motor further comprises a power mechanism arranged in the motor shell to drive air to flow into the heat dissipation flow channel from the first and / or second through holes and to flow along the surface of the rotor assembly in the heat dissipation flow channel to dissipate heat for the rotor assembly. Under the driving of the power mechanism, the axial flux motor of the utility model enables air to enter the heat dissipation flow channel from the first and / or second through holes and to flow along the surface of the rotor assembly to dissipate heat, thereby realizing forced air cooling to cool the magnet steel of the rotor assembly.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to an axial flux motor. Background Technology

[0002] Axial flux motors (AFMs) are gaining increasing attention in the new energy vehicle industry due to their compact axial dimensions, smaller size, lighter weight, and ability to deliver greater torque and power. They offer stronger drive torque in a smaller and lighter structure. However, cooling issues for axial flux motors (including the rotor and stator) are one of the main problems limiting their mass production and widespread adoption.

[0003] Existing rotor cooling solutions for axial flux motors mainly include natural air cooling and oil cooling. Natural air cooling is commonly used in dual-rotor single-stator and single-rotor single-stator designs, where the rotor is located on the outer side. In these designs, cooling is achieved by utilizing heat dissipation fins on the outer side of the rotor to contact the air. However, in dual-stator single-rotor designs, where the rotor is located on the inner side between the two stators, the small gap between the stator and rotor restricts heat dissipation pathways, resulting in poor heat dissipation. When using oil cooling to cool the rotor, one known method involves cooling oil entering from the rotor shaft, reaching the rotor structure, and finally falling into the oil pan. However, this method is detrimental to rotor dynamic balance and causes oil churning losses, leading to reduced motor efficiency. Therefore, an improved cooling solution, particularly for the rotor of axial flux motors, is needed. Utility Model Content

[0004] The purpose of this utility model is to solve at least one of the above-mentioned problems and / or other problems existing in the prior art.

[0005] To achieve the above objectives, according to one aspect of the present invention, an axial flux motor is provided, the axial flux motor comprising: a motor housing; a first stator assembly and a second stator assembly fixedly arranged within the motor housing; a rotor assembly disposed between the first stator assembly and the second stator assembly; and a motor shaft passing through the first stator assembly, the rotor assembly, and the second stator assembly and fixed to the rotor assembly to drive the rotor assembly to rotate together; wherein a heat dissipation channel is formed inside the motor housing; a plurality of first through holes and a plurality of second through holes arranged circumferentially and communicating with the heat dissipation channel are respectively formed on the first stator assembly and the second stator assembly; wherein the axial flux motor further comprises a power mechanism disposed within the motor housing to drive air to flow into the heat dissipation channel from the first through holes and / or the second through holes and to drive the air to flow along the heat dissipation channel over the surface of the rotor assembly to dissipate heat from the rotor assembly.

[0006] According to one embodiment of the present invention, the rotor assembly, the first stator assembly, the second stator assembly, and the motor housing define a cavity and a gap that communicate with each other to form the heat dissipation channel.

[0007] According to one embodiment of the present invention, the power mechanism includes a forced power structure, which can rotate with the motor shaft to provide power to cause air to flow into the heat dissipation channel and force the air to flow over the surface of the rotor assembly.

[0008] According to one embodiment of the present invention, a forced power structure is provided between the rotor assembly and one of the first stator assembly and the second stator assembly to drive air to flow into the heat dissipation channel from one of the first through hole and the second through hole.

[0009] According to one embodiment of the present invention, the power mechanism further includes an auxiliary power structure located between the rotor assembly and the other of the first stator assembly and the second stator assembly. The auxiliary power structure can rotate with the motor shaft to facilitate the discharge of air flowing into the heat dissipation channel from the other of the first through hole and the second through hole.

[0010] According to one embodiment of the present invention, the rotor assembly includes a rotor support frame, the rotor support frame including an inner ring section and an outer ring section carrying magnets; a rotor fixing part is fixedly disposed on the motor shaft so that they can rotate together; the inner ring section of the rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate, and is fixed to the motor shaft so that they can rotate together by inserting a plurality of fasteners axially through the rotor fixing part, the inner ring section and the rotor pressure plate; wherein, the forced power structure is disposed on the rotor fixing part; the auxiliary power structure is disposed on the side of the inner ring section of the rotor support frame opposite to the rotor fixing part.

[0011] According to one embodiment of the present invention, the forced power structure includes a plurality of fan blades extending radially outward from the rotor fixing portion, each fan blade having a torsional feature structure to allow pressurization of air flowing into the heat dissipation channel.

[0012] According to one embodiment of the present invention, the auxiliary power structure includes an annular groove extending circumferentially on the side of the inner ring section opposite to the rotor fixing part and a plurality of auxiliary fan blades, wherein the plurality of auxiliary fan blades are arranged circumferentially at intervals in the annular groove and each extends radially in the shape of a straight plate.

[0013] According to one embodiment of the present invention, the heat dissipation channel includes an air inlet section formed by a cavity between one of the first stator assembly and the second stator assembly and the rotor assembly, an intermediate section formed by a gap between the motor housing and the rotor assembly, and an air outlet section formed by a cavity between the other of the first stator assembly and the second stator assembly and the rotor assembly.

[0014] According to one embodiment of the present invention, two forced power structures are provided between the rotor assembly and the first stator assembly and between the rotor assembly and the second stator assembly to drive air to flow into the heat dissipation channel from the first through hole and the second through hole.

[0015] According to one embodiment of the present invention, the rotor assembly includes a rotor support frame, the rotor support frame including an outer ring section and an inner ring section carrying magnets; a rotor fixing part is fixedly disposed on the motor shaft so that they can rotate together; the inner ring section of the rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate, and is fixed to the motor shaft so that they can rotate together by inserting a plurality of fasteners axially through the rotor fixing part, the inner ring section and the rotor pressure plate; wherein, one of the two forced power structures is disposed on one side of the inner ring section or on the rotor fixing part, and the other is disposed on the other side of the inner ring section or on the rotor pressure plate.

[0016] According to one embodiment of the present invention, the forced power structure includes a plurality of fan blades, each of the fan blades having a torsion feature structure; the torsion directions of the fan blades of the two forced power structures are set to be opposite to each other, so that air flows into the heat dissipation channel through the first through hole and the second through hole respectively, and flows out through a plurality of heat dissipation holes arranged circumferentially on the motor housing.

[0017] According to one embodiment of the present invention, the forced power structure includes a plurality of fan blades, each fan blade being a straight plate extending radially.

[0018] According to one embodiment of the present invention, the heat dissipation channel includes two air inlet sections formed by cavities between the first stator assembly and the second stator assembly and the rotor assembly, a converging section formed by the gap between the motor housing and the rotor assembly, and an air outlet section formed by the heat dissipation holes, wherein air from the two air inlet sections converges at the converging section.

[0019] According to one embodiment of the present invention, the rotor fixing part is integrally formed with the motor shaft.

[0020] According to another aspect of the present invention, an axial flux motor is provided, the axial flux motor comprising: a motor shaft, on which a rotor fixing portion is integrally formed; and a rotor assembly, the motor shaft passing through the rotor assembly, the rotor assembly being fixed to the rotor fixing portion so as to rotate together with the motor shaft; wherein, the axial flux motor further comprises a forced power structure disposed on the rotor fixing portion, the forced power structure being capable of rotating with the motor shaft to promote airflow.

[0021] According to one embodiment of the present invention, the axial flux motor further includes an auxiliary power structure disposed on the side of the rotor assembly opposite to the rotor fixing part, the auxiliary power structure being able to rotate with the motor shaft to promote airflow.

[0022] According to one embodiment of the present invention, the forced power structure is configured to promote airflow so that air flows over the surface of the rotor assembly near the rotor fixing part, and the auxiliary power structure is configured to promote airflow so that air flows over the surface of the rotor assembly away from the rotor fixing part.

[0023] According to one embodiment of the present invention, the rotor assembly includes a rotor support frame, the rotor support frame includes an inner ring section and an outer ring section carrying magnets; the auxiliary power structure is disposed on the side of the inner ring section of the rotor support frame opposite to the rotor fixing part.

[0024] According to one embodiment of the present invention, the rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate, and is fixed to the motor shaft so as to be able to rotate together by inserting a plurality of fasteners axially through the rotor fixing part, the rotor assembly and the rotor pressure plate; the auxiliary power structure is disposed on the rotor pressure plate.

[0025] According to one embodiment of the present invention, the axial flux motor further includes a stator assembly, through which the motor shaft passes, such that the stator assembly is axially disposed on the side of the rotor assembly near the rotor fixing portion or away from the rotor fixing portion.

[0026] The axial flux motor of this invention has a heat dissipation channel formed inside the motor housing, and multiple first through holes and multiple second through holes communicating with the heat dissipation channel are formed on the first stator assembly and the second stator assembly, respectively. By arranging a power mechanism in the heat dissipation channel, air can enter the heat dissipation channel from one or both of the first through holes and the second through holes under the drive of the power mechanism, and flow over the surface of the rotor assembly to dissipate heat, thereby achieving forced air cooling to cool the magnets of the rotor assembly. Attached Figure Description

[0027] The features and advantages of this utility model will become clear from the following detailed description provided with reference to the accompanying drawings. It should be understood that the following drawings are merely schematic and not necessarily drawn to scale, and therefore should not be considered as limitations on this utility model, wherein:

[0028] Figure 1 A partial perspective view of a half-section of an axial flux motor according to an embodiment of the present invention is shown.

[0029] Figure 2 Show Figure 1 The diagram shows an exploded view of the rotor assembly and motor shaft of an axial flux motor.

[0030] Figure 3 Show Figure 2 The right-side perspective view of the rotor assembly and motor shaft is shown.

[0031] Figure 4 Show Figure 2 The left-side perspective view of the rotor assembly and motor shaft is shown.

[0032] Figure 5 Show Figure 1 The diagram shows the airflow direction of the heat dissipation channel of the axial flux motor when it has a forced power structure and an auxiliary power structure.

[0033] Figure 6 Show Figure 1 The diagram shows the airflow direction of the heat dissipation channel of the axial flux motor when it has two forced power structures. Detailed Implementation

[0034] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, numerous specific details are set forth to enable those skilled in the art to more fully understand and implement the present invention. However, it will be apparent to those skilled in the art that implementations of the present invention may not include some of these specific details. Furthermore, it should be understood that the present invention is not limited to the specific embodiments described. Rather, the present invention can be conceived to be implemented with any combination of the features and elements described below, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments, and advantages are for illustrative purposes only and should not be construed as elements or limitations of the claims unless expressly set forth in the claims.

[0035] The terms "first" and "second" are used below to describe the elements of this application. These terms are used only to distinguish the individual elements and not to limit the nature, order, or number of these elements. The terms "comprising" and "having" are used to indicate an open-ended inclusion and mean that there may be additional elements / components besides those listed.

[0036] Figure 1 An axial flux motor according to one embodiment of the present invention is shown. For example... Figure 1 As shown, the axial flux motor according to this embodiment may include a motor housing 1, a first stator assembly 2, a second stator assembly 3, a rotor assembly 4, and a motor shaft 5. Figure 1 As shown, the motor housing 1 is generally cylindrical and is assembled with the first stator assembly and the second stator assembly to form a heat dissipation channel 6 for dissipating heat from the rotor assembly 4 in the radial interior of the motor housing (see Figure 1). Figure 5 The first stator assembly 2 and the second stator assembly 3 are generally columnar structures, arranged opposite to each other and connected to the motor housing 1 at two axial ends. The first stator assembly 2 has a plurality of first through holes 21 arranged circumferentially, which communicate with the heat dissipation channel 6. The second stator assembly 3 has a plurality of second through holes 31 arranged circumferentially, which communicate with the heat dissipation channel 6. Thus, the plurality of first through holes 21 and the plurality of second through holes 31 can be configured as inlets for air entering the heat dissipation channel 6 and outlets for air exiting the heat dissipation channel 6, or the plurality of first through holes 21 and the plurality of second through holes 31 can be configured together as inlets for air entering the heat dissipation channel 6. The rotor assembly 4 is disposed between the first stator assembly 2 and the second stator assembly 3. The motor shaft 5 passes sequentially through the first stator assembly 2, the rotor assembly 4, and the second stator assembly 3, and is fixed to the rotor assembly 4 so as to drive the rotor assembly 4 to rotate together.

[0037] Continue to refer to Figure 1 The axial flux motor according to this embodiment may further include a power mechanism 7 disposed within the motor housing 1. When operating within the motor housing 1, the power mechanism 7 provides power to the air, driving the air to flow from the first through-hole 21 and the second through-hole 31 into the heat dissipation channel 6 and out through the heat dissipation hole 11 on the motor housing (see...). Figure 6 It can also drive air to enter the heat dissipation channel 6 from the first through hole 21 (or the second through hole 31) and flow out of the heat dissipation channel 6 from the second through hole 31 (or the first through hole 21) (see...). Figure 5When air flows along the heat dissipation channel 6 across the surface of the rotor assembly 4, it can directly carry away heat from the rotor assembly, thereby achieving heat dissipation and cooling of the magnets of the rotor assembly. It is understood that the surface of the rotor assembly 4 may include a first axial end face facing the first stator assembly 2, a second axial end face facing the second stator assembly 2, and an outer peripheral surface, etc.

[0038] The rotor assembly 4 and the first stator assembly 2 jointly define a cavity consisting of a chamber and an air gap. Specifically, see [link to details]. Figure 1 A cavity is defined between the rotor assembly 4 and the middle portion of the end side plate (which is connected to the motor housing) of the first stator assembly 2 on the left, and an air gap is defined between the rotor assembly 4 and the outer peripheral portion of the first stator assembly 2 where the stator windings are mounted. Similarly, a cavity is defined between the second stator assembly 3 and the rotor assembly 4. A gap is defined between the motor housing 1 and the rotor assembly 4. These cavities and gaps are interconnected and cover the surface of the rotor assembly 4, thereby forming heat dissipation channels 6.

[0039] According to this embodiment, the power mechanism 7 may include a forced power structure 71 disposed within the heat dissipation channel 6. The forced power structure 71 can rotate together with the motor shaft 5, thereby generating a driving force that allows air to flow into the heat dissipation channel 6 and forces the air to flow along the heat dissipation channel 6 over the surface of the rotor assembly 4 to carry away heat.

[0040] Figures 1 to 5 A heat dissipation channel 6 according to a first embodiment of the present invention is shown. Figures 1 to 3 As shown, a forced power structure 71, capable of rotating with the motor shaft 5, is provided between the rotor assembly 4 and the second stator assembly 3, thereby driving air to flow into the heat dissipation channel 6 from either the first through hole 21 or the second through hole 31. Alternatively, the forced power structure 71 can also be provided between the rotor assembly 4 and the first stator assembly 2. Since the cavities (or gaps) formed by the rotor assembly 4 and the two stator assemblies 2 and 3 are interconnected, the forced power structure 71 can be located on either side of the rotor assembly to provide power to the air flowing into the heat dissipation channel 6, for example, to compress the air and drive air circulation.

[0041] Optionally, the power mechanism 7 according to this embodiment may further include an auxiliary power structure 72, which is disposed opposite to the forced power structure 71 and rotates together with the motor shaft 5. Specifically, the forced power structure 71 is disposed between the rotor assembly 4 and one of the two stator assemblies 2 and 3, while the auxiliary power structure 72 may be disposed between the rotor assembly 4 and the other of the two stator assemblies 2 and 3. Thus, the auxiliary power structure 72 and the forced power structure 71 can work together to promote the inflow of air from one of the first through hole 21 and the second through hole 31 and the exhaust from the other.

[0042] Specifically, such as Figures 2 to 4 As shown, the rotor assembly 4 according to this embodiment may include a rotor support frame 41 and a plurality of magnets 42. The rotor support frame 41 may include an inner ring section and an outer ring section, wherein the inner ring section is generally annular to form a through hole through which the motor shaft 5 passes. The outer ring section extends radially outward from the outer periphery of the inner ring section and has a plurality of structures for receiving the magnets 42 arranged at intervals along its circumference. A rotor fixing part 8 and a rotor pressure plate 9 are provided on the motor shaft 5 and are arranged opposite each other along its axial direction, wherein the rotor fixing part 8 may preferably be integrally formed on the motor shaft 5, thereby being able to rotate together with the motor shaft 5. A plurality of through holes are arranged at intervals along their respective circumferences on the rotor fixing part 8, the inner ring section of the rotor support frame 41, and the rotor pressure plate 9. Thus, by sequentially attaching the rotor support frame 41 and the rotor pressure plate 9 onto the motor shaft 5, and by having multiple fasteners pass through the corresponding through holes, the rotor support frame 41 and the rotor pressure plate 9 can be fixed to the rotor fixing part 8, allowing the rotor support frame 41 and the rotor pressure plate 9 to rotate together with the motor shaft 5. According to a specific embodiment of this utility model, the forced power structure 71 is disposed on the rotor fixing part 8, and the auxiliary power structure 72 is disposed on the side of the inner ring section of the rotor support frame 41 facing away from the rotor fixing part 8 (see...). Figure 1 ).

[0043] refer to Figure 2 and Figure 3 As shown, the forced power structure 71 according to this embodiment may include a plurality of fan blades 711 extending radially outward from the outer periphery of the rotor fixing part 8. Each fan blade 711 may have a torsional characteristic structure like a turbine blade, thereby generating a pressurizing effect and providing power to the air to drive air circulation. For example, each fan blade may have a turbulence surface in the form of a curved surface, so that each fan blade has a twist angle and curvature, and changes spirally from the center outward. Of course, it can be understood that the torsional characteristic structure of the fan blade 711 may refer to the connection part of the fan blade 711 and the rotor fixing part 8 (or "blade root") being arranged in a straight line or curved direction deflected in the tangential direction, and the outermost edge of the fan blade 711 (or "blade tip") extending along a curve and forming a curved protrusion at one end (see, for example, see...). Figure 3 ).

[0044] refer to Figure 2 and Figure 4As shown, the auxiliary power structure 72 according to this embodiment may include an annular groove 721 and a plurality of auxiliary fan blades 722. The annular groove 721 is arranged on the inner ring section of the rotor support frame 41 and is located on the side of the inner ring section opposite to the rotor fixing part 8, so that the annular groove 721 can form an air guiding surface on this side of the inner ring section, avoiding turbulence or flow of air entering the annular groove 721 due to impact with the rotor support frame 41. The plurality of auxiliary fan blades 722 are arranged circumferentially at intervals in the annular groove 721 and each extends radially along the annular groove 721 in a straight plate shape. Thus, the auxiliary fan blades 722 can act as an auxiliary power structure to assist the forced power structure 71 in driving air to enter and exit the heat dissipation channel 6 and to flow within the heat dissipation channel 6, thereby achieving forced air cooling of the rotor assembly and greatly improving cooling efficiency.

[0045] In this embodiment, as Figure 5 As shown, the heat dissipation channel 6 may include an inlet section 61, an intermediate section 62, and an outlet section 63 connected in sequence. The inlet section 61 is formed by the cavity (including the cavity and air gap) between the first stator assembly 2 and the rotor assembly 3. The intermediate section 62 is formed by the gap between the motor housing 1 and the rotor assembly 4. The outlet section 63 is formed by the cavity (including the cavity and air gap) between the second stator assembly 3 and the rotor assembly 4. In this way, by rationally designing the torsional characteristic structure of the fan blade 711 of the forced power structure 71, air can enter the heat dissipation channel 6 through the first through hole 21 and flow out of the heat dissipation channel 6 through the second through hole 31. In other embodiments, for example by designing the fan blades 711 in the opposite manner to the above scheme, the air inlet section 61 can be formed by the cavity between the second stator assembly 3 and the rotor assembly 4, the intermediate section 62 is still formed by the gap between the motor housing 1 and the rotor assembly 4, and the air outlet section 63 is formed by the cavity between the first stator assembly 2 and the rotor assembly 4, thereby driving air to enter the heat dissipation channel 6 through the second through hole 31 and flow out of the heat dissipation channel 6 through the first through hole 21.

[0046] Figure 6 A heat dissipation channel 6 according to a second embodiment of the present invention is shown. (See figure) Figure 6 As shown, two forced power structures 71 are provided between the rotor assembly 4 and the first stator assembly 2 and the second stator assembly 3, respectively, so as to drive air from the axial sides of the rotor assembly 4 into the heat dissipation channel 6 through the first through hole 21 and the second through hole 31.

[0047] As an optional implementation, one forced power structure 71 can be disposed on the rotor fixing part 8, and the other forced power structure 71 can be disposed on the rotor pressure plate 9, thereby allowing the two forced power structures 71 to rotate together with the motor shaft 5. However, in some other embodiments, the two forced power structures 71 can be disposed on opposite sides of the inner ring section of the rotor support frame 41, respectively. Of course, different placement positions of the forced power structures can be selected according to the actual structure and design requirements, as long as the intended function of this document can be achieved. In this embodiment, the blades of the forced power structure 71 can be of the type with torsional features described above, or they can be of the type of blades extending radially in a straight plate shape.

[0048] like Figure 6 As shown, when both forced power structures 71 adopt fan blades with torsional features, by designing the torsional features of the fan blades 711 of the two forced power structures 71 to be opposite to each other, when the fan blades 711 of the two forced power structures rotate in the same direction with the motor shaft 5, the forced power structure 71 on the left can draw in air through the first through hole 21, and the forced power structure 71 on the right can draw in air through the second through hole 31. In addition, a plurality of heat dissipation holes 11 are arranged circumferentially on the motor housing 1, and air can flow over the surface of the rotor assembly 4 under the drive of the two forced power structures 71 and flow out of the heat dissipation channel 6 through the plurality of heat dissipation holes 11, thereby completing the effective cooling of the rotor assembly.

[0049] Continue to refer to Figure 6 As shown, in this embodiment, the heat dissipation channel may include two inlet sections 64 and 65, a converging section 66, and an outlet section 67. The inlet section 64 is formed by the cavity between the first stator assembly 2 and the rotor assembly 4; the inlet section 65 is formed by the cavity between the second stator assembly 3 and the rotor assembly 4; the converging section 66 is formed by the gap between the rotor assembly 4 and the motor housing 1; and the outlet section is formed by multiple heat dissipation holes 11. Thus, driven by the forced power structure 71 on the left, air enters the inlet section 64 through the first through hole 21 and flows through the left axial end face of the rotor assembly 4, while driven by the forced power structure 71 on the right, air enters the inlet section 64 through the second through hole 31 and flows through the right axial end face of the rotor assembly 4. The air from both sides converges at the converging section 66 and flows through the outer peripheral surface of the rotor assembly 4, then exits the heat dissipation channel 6 via the outlet section 67.

[0050] Of course, it is conceivable that the techniques discussed above for heat dissipation of the rotor assembly are also applicable to axial flux motors with a single stator-single rotor structure. For example, as a preferred embodiment, the axial flux motor may include a forced power structure 71 disposed on the rotor mounting portion 8 and an auxiliary power structure 72 disposed on the side of the rotor assembly opposite to the rotor mounting portion. The forced power structure and the auxiliary power structure can rotate with the motor shaft to promote airflow, so that air can flow over the surface of the rotor assembly near the rotor mounting portion and the surface of the rotor assembly opposite to the rotor mounting portion, respectively. The stator assembly of this axial flux motor may be axially disposed on the side of the rotor assembly near the rotor mounting portion 8 or on the side opposite to the rotor mounting portion 8.

[0051] Similar to the embodiments discussed above, the rotor assembly can be sandwiched between the rotor fixing part 8 and the rotor pressure plate 9, and is fixed to the motor shaft so as to rotate together by a plurality of fasteners inserted axially through the rotor fixing part, the rotor assembly, and the rotor pressure plate. The auxiliary power structure 72 may be selectively provided on the side of the inner ring section of the rotor support frame 41 of the rotor assembly opposite to the rotor fixing part 8 or provided on the rotor pressure plate 9.

[0052] As described above, the axial flux motor according to this invention has a heat dissipation channel formed inside the motor housing, and multiple first through holes and multiple second through holes communicating with the heat dissipation channel are formed on the first stator assembly and the second stator assembly, respectively. By arranging a power mechanism within the heat dissipation channel, air can enter the heat dissipation channel through one or both of the first and second through holes under the drive of the power mechanism, and flow over the surface of the rotor assembly for heat dissipation, thereby achieving forced air cooling of the magnets of the rotor assembly. In addition, the forced power structure and / or auxiliary power structure in the power mechanism can be integrally formed on the rotor fixing part, rotor pressure plate, and rotor support frame according to actual needs (e.g., the speed and operating conditions of the axial flux motor), and the air cooling path and air cooling effect can be flexibly selected. This cooling scheme also allows forced air cooling to be achieved through structural design using the components of the axial flux motor itself without adding additional parts, which not only reduces manufacturing costs but also achieves a more compact structure.

[0053] Various modifications and variations can be made to the embodiments disclosed above without departing from the scope or spirit of this invention. Other embodiments of this invention will be apparent to those skilled in the art based on the practice of this invention disclosed in this specification. This specification and the examples disclosed herein should be considered illustrative only, and the true scope of this invention is defined by the appended claims and their equivalents.

Claims

1. An axial flux motor, characterized in that, The axial flux motor includes: Motor housing (1); A first stator assembly (2) and a second stator assembly (3) are fixedly arranged within the motor housing; The rotor assembly (4) is disposed between the first stator assembly and the second stator assembly; and The motor shaft (5) passes through the first stator assembly, the rotor assembly and the second stator assembly and is fixed to the rotor assembly so as to drive the rotor assembly to rotate together; A heat dissipation channel (6) is formed inside the motor housing; a plurality of first through holes (21) and a plurality of second through holes (31) are respectively formed on the first stator assembly and the second stator assembly, which are arranged circumferentially and communicate with the heat dissipation channel. The axial flux motor further includes a power mechanism (7) disposed in the motor housing to drive air to flow into the heat dissipation channel from the first through hole and / or the second through hole and drive the air to flow along the heat dissipation channel over the surface of the rotor assembly to dissipate heat from the rotor assembly.

2. The axial flux motor according to claim 1, characterized in that, The rotor assembly (4) defines a cavity and gap that communicate with each other between the first stator assembly (2), the second stator assembly (3) and the motor housing (1) to form the heat dissipation channel.

3. The axial flux motor according to claim 2, characterized in that, The power mechanism (7) includes a forced power structure (71) that can rotate with the motor shaft to provide power to cause air to flow into the heat dissipation channel and force the air to flow over the surface of the rotor assembly.

4. The axial flux motor according to claim 3, characterized in that, A forced power structure is provided between the rotor assembly and one of the first stator assembly and the second stator assembly to drive air into the heat dissipation channel from one of the first through hole and the second through hole.

5. The axial flux motor according to claim 4, characterized in that, The power mechanism (7) further includes an auxiliary power structure (72) located between the rotor assembly and the other of the first stator assembly and the second stator assembly. The auxiliary power structure can rotate with the motor shaft to facilitate the discharge of air flowing into the heat dissipation channel from the other of the first through hole and the second through hole.

6. The axial flux motor according to claim 5, characterized in that, The rotor assembly (4) includes a rotor support frame (41), which includes an inner ring section and an outer ring section carrying magnets. A rotor fixing part (8) is fixedly provided on the motor shaft so that it can rotate together; the inner ring section of the rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate (9), and is fixed to the motor shaft so that it can rotate together by inserting a plurality of fasteners through the rotor fixing part, the inner ring section and the rotor pressure plate along the axial direction; The forced power structure (71) is disposed on the rotor fixing part; the auxiliary power structure (72) is disposed on the side of the inner ring section of the rotor support frame away from the rotor fixing part.

7. The axial flux motor according to claim 6, characterized in that, The forced power structure includes a plurality of fan blades (711) extending radially outward from the rotor fixing portion, each fan blade having a torsional feature structure to allow pressurization of air flowing into the heat dissipation channel.

8. The axial flux motor according to claim 7, characterized in that, The auxiliary power structure (72) includes an annular groove (721) extending circumferentially on the side of the inner ring section opposite to the rotor fixing part and a plurality of auxiliary fan blades (722), the plurality of auxiliary fan blades being arranged circumferentially at intervals in the annular groove and each being a straight plate extending radially.

9. The axial flux motor according to any one of claims 4 to 8, characterized in that, The heat dissipation channel (6) includes an air inlet section formed by the cavity between one of the first stator assembly and the second stator assembly and the rotor assembly (4), an intermediate section formed by the gap between the motor housing (1) and the rotor assembly (4), and an air outlet section formed by the cavity between the other of the first stator assembly and the second stator assembly and the rotor assembly (4).

10. The axial flux motor according to claim 3, characterized in that, Two forced power structures are provided between the rotor assembly and the first stator assembly and between the rotor assembly and the second stator assembly to drive air into the heat dissipation channel from the first through hole and the second through hole.

11. The axial flux motor according to claim 10, characterized in that, The rotor assembly (4) includes a rotor support frame (41), which includes an outer ring section and an inner ring section carrying magnets. A rotor fixing part (8) is fixedly provided on the motor shaft so that it can rotate together; the inner ring section of the rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate (9), and is fixed to the motor shaft so that it can rotate together by inserting a plurality of fasteners through the rotor fixing part, the inner ring section and the rotor pressure plate along the axial direction; One of the two forced power structures (71) is located on one side of the inner ring section or on the rotor fixing part, and the other is located on the other side of the inner ring section or on the rotor pressure plate.

12. The axial flux motor according to claim 11, characterized in that, The forced power structure includes a plurality of fan blades (711), each of which has a torsion feature structure; the torsion directions of the fan blades of the two forced power structures are set to be opposite to each other, so that air flows into the heat dissipation channel (6) through the first through hole (21) and the second through hole (31) respectively, and flows out through a plurality of heat dissipation holes (11) arranged circumferentially on the motor housing (1).

13. The axial flux motor according to claim 11, characterized in that, The forced power structure includes multiple fan blades (711), each of which is a straight plate extending radially.

14. The axial flux motor according to claim 12, characterized in that, The heat dissipation channel (6) includes two air inlet sections formed by the cavities between the first stator assembly (2) and the second stator assembly (3) and the rotor assembly (4), a converging section formed by the gap between the motor housing (1) and the rotor assembly (4), and an air outlet section formed by the heat dissipation holes, wherein air from the two air inlet sections converges at the converging section.

15. The axial flux motor according to claim 6 or 11, characterized in that, The rotor fixing part is integrally formed with the motor shaft (5).

16. An axial flux motor, characterized in that, The axial flux motor includes: Motor shaft (5), on which a rotor fixing part (8) is integrally formed; and Rotor assembly (4), the motor shaft passes through the rotor assembly, and the rotor assembly is fixed to the rotor fixing part so as to rotate together with the motor shaft; The axial flux motor also includes a forced power structure (71) disposed on the rotor fixing part, which can rotate with the motor shaft to promote air flow.

17. The axial flux motor according to claim 16, characterized in that, The axial flux motor also includes an auxiliary power structure (72) disposed on the side of the rotor assembly opposite to the rotor fixing part, the auxiliary power structure being able to rotate with the motor shaft to promote airflow.

18. The axial flux motor according to claim 17, characterized in that, The forced power structure is configured to facilitate airflow so that air flows over the surface of the rotor assembly near the rotor mounting portion, and the auxiliary power structure is configured to facilitate airflow so that air flows over the surface of the rotor assembly away from the rotor mounting portion.

19. The axial flux motor according to claim 17, characterized in that, The rotor assembly (4) includes a rotor support frame (41), which includes an inner ring section and an outer ring section carrying magnets. The auxiliary power structure (72) is located on the side of the inner ring section of the rotor support frame away from the rotor fixing part.

20. The axial flux motor according to claim 17, characterized in that, The rotor assembly is sandwiched between the rotor fixing part and the rotor pressure plate (9), and is fixed to the motor shaft so as to be able to rotate together by inserting a plurality of fasteners axially through the rotor fixing part, the rotor assembly and the rotor pressure plate; The auxiliary power structure (72) is disposed on the rotor pressure plate.

21. The axial flux motor according to claim 16, characterized in that, The axial flux motor further includes a stator assembly (2), through which the motor shaft passes, such that the stator assembly is axially disposed on the side of the rotor assembly near the rotor fixing part or away from the rotor fixing part.

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