Heat dissipation structure of axial magnetic flux motor, axial magnetic flux motor and aircraft

Abstract

The invention provides a heat dissipation structure of an axial magnetic flux motor, which comprises a stator upper positioning plate, a stator lower positioning plate and heat pipes, and is characterized in that the stator upper positioning plate and the stator lower positioning plate are laminated along the axial direction of the motor, and heat pipe mounting grooves are arranged between block coil positioning cabins of the stator upper positioning plate and the stator lower positioning plate; the heat pipe mounting grooves extend in the radial direction, the heat pipes are fixed in the heat pipe mounting grooves, internal heat can be conducted to the outer side wall of the stator positioning plate through the heat pipes, internal heat accumulation is reduced, heat of the outer side wall of the stator positioning plate can be dissipated through an air cooling heat dissipation system, and the air cooling heat dissipation effect can be effectively improved. According to the heat dissipation structure of the axial flux motor, heat in the block coils of the stator can be conducted to the outside through the heat pipes, internal heat accumulation is reduced, internal heat dissipation can be effectively achieved by combining an air cooling heat dissipation system on the outer surface, the heat dissipation efficiency of the air cooling heat dissipation system is improved, the influence on the system complexity and weight of an unmanned aerial vehicle is small, and the service life of the unmanned aerial vehicle is prolonged. The reliability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a heat dissipation structure of an axial flux motor, an axial flux motor and an aircraft. BACKGROUND

[0002] The axial flux motor has the advantages of compact structure, high efficiency and large power density, which can improve the power performance of the unmanned aerial vehicle, but the compact structure and large power density of the axial flux motor result in obvious heat generation and temperature rise, which restricts the actual working power and limits the improvement effect on the power performance of the unmanned aerial vehicle.

[0003] At present, the mainstream heat dissipation schemes are air cooling and water cooling. The water cooling has high heat dissipation efficiency, but needs to be matched with cooling liquid, water circulation and heat sink and other circulating components, needs a certain installation space, is commonly used in medium and large unmanned aerial vehicles, and increases the system complexity and weight of the unmanned aerial vehicle and reduces the reliability. The air cooling has small demand for installation space, is commonly used in small unmanned aerial vehicles, but has low heat dissipation efficiency, and usually increases the heat dissipation efficiency by arranging heat dissipation fins on the outer surface of the motor. However, the axial flux motor has a compact structure, and the internal heat accumulation is obvious. The heat dissipation fins arranged on the outer surface have little effect. SUMMARY

[0004] Therefore, the present application aims to provide a heat dissipation structure of an axial flux motor, an axial flux motor and an aircraft to solve the problem that the heat dissipation effect of the traditional air cooling is insufficient, and the water cooling has high heat dissipation efficiency, but increases the system complexity and weight of the unmanned aerial vehicle and reduces the reliability.

[0005] In one aspect, the present application provides a heat dissipation structure of an axial flux motor, comprising: an upper stator positioning plate, a lower stator positioning plate and a heat pipe, wherein, The upper stator positioning plate and the lower stator positioning plate are arranged in the axial direction of the motor in layers, and a heat pipe mounting groove is arranged between each sub-coil positioning cabin of the upper stator positioning plate and the lower stator positioning plate, and the heat pipe mounting groove extends in the radial direction. The heat pipe is fixed in the heat pipe mounting groove.

[0006] Optionally, the heat pipe mounting groove is arranged on the abutting surface of the upper stator positioning plate and the lower stator positioning plate.

[0007] Optionally, the heat pipe has an L-shaped structure to form a continuous radial section and a circumferential section, and the circumferential section is arranged on the outer side of the motor.

[0008] Optionally, the edge position of the upper stator positioning plate and the lower stator positioning plate is further provided with heat dissipation fins, and the heat dissipation fins are arranged in multiple numbers at intervals around the motor.

[0009] Optionally, an upper rotor and a lower rotor are arranged above and below the upper stator positioning plate and the lower stator positioning plate respectively, wherein, The heat dissipation fins are vertically arranged on the upper surface of the upper stator positioning plate and the lower surface of the lower stator positioning plate respectively. The centrifugal air ducts are arranged in the upper rotor and the lower rotor, and the air outlets of the centrifugal air ducts are directed to the heat dissipation fins.

[0010] Optionally, the heat dissipation fins are arranged in a radial direction of the motor.

[0011] Optionally, the centrifugal air ducts are guide grooves arranged on the lower surface of the upper rotor and the upper surface of the lower rotor.

[0012] The application further provides an axial flux motor comprising the heat dissipation structure of the axial flux motor.

[0013] The application further provides an aircraft comprising the axial flux motor.

[0014] The heat dissipation structure of the axial flux motor comprises an upper stator positioning plate, a lower stator positioning plate and heat pipes, wherein the upper stator positioning plate and the lower stator positioning plate are arranged in a stacking manner along an axial direction of the motor, heat pipe mounting grooves are arranged between each sub-coil positioning cabin of the upper stator positioning plate and the lower stator positioning plate, the heat pipe mounting grooves extend in a radial direction, and the heat pipes are fixed in the heat pipe mounting grooves. The heat pipes can conduct the internal heat to the outer sidewall of the stator positioning plate, reduce the internal heat accumulation, the heat of the outer sidewall of the stator positioning plate can be dissipated by the air cooling heat dissipation system, and the air cooling heat dissipation effect can be effectively improved. The heat dissipation structure of the axial flux motor can conduct the internal heat of the sub-coils of the stator to the outside through the heat pipes, reduce the internal heat accumulation, effectively dissipate the internal heat by combining the air cooling heat dissipation system on the outer surface, improve the heat dissipation efficiency of the air cooling heat dissipation system, has little influence on the system complexity and weight of the unmanned aerial vehicle, and has high reliability. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a schematic diagram of the overall structure of the axial flux motor in the embodiment of the application; Figure 2 FIG. 2 is an exploded structural schematic diagram of the axial flux motor in the embodiment of the application; Figure 3 FIG. 3 is a structural schematic diagram of the lower stator positioning plate of the axial flux motor in the embodiment of the application; Figure 4 FIG. 4 is a structural schematic diagram of the lower rotor of the axial flux motor in the embodiment of the application.

[0016] The following detailed description will further explain the present application with reference to the above mentioned drawings. DETAILED DESCRIPTION

[0017] For the purposes of promoting an understanding of the principles of the application, reference will now be made to the embodiments illustrated in the drawings. It is expressly understood that the drawings are graphic depictions of the present application and are not to be construed as limiting the present application. In the drawings:

[0018] It is to be understood that the terminology used herein is for the purpose of describing the particular embodiments only and is not intended to be limiting. It is also possible that the use of the same terms can be used to describe different embodiments. It is intended that all such embodiments are within the scope of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description of the application, the following terms are defined with the following meanings:

[0020] To solve the problem of insufficient heat dissipation effect of traditional air cooling, and the problem of increasing system complexity and weight of the unmanned aerial vehicle and reducing reliability of water cooling although the heat dissipation efficiency is high, the application provides a heat dissipation structure of an axial flux motor, heat pipe mounting grooves are arranged between each sub-coil positioning cabin of the upper stator positioning plate and the lower stator positioning plate of the stator, so as to fix the heat pipes in the heat pipe mounting grooves, the heat pipes are arranged in the radial direction, the internal heat can be conducted to the outer side wall of the stator positioning plate through the heat pipes, the heat conducted to the outer side wall can be effectively dissipated through the external surface heat dissipation design such as air cooling or water cooling, the internal heat accumulation can be effectively reduced, and the heat dissipation effect is improved. The heat dissipation structure of the axial flux motor can conduct the internal heat of the sub-coil of the stator to the outside through the heat pipes, reduce the internal heat accumulation, effectively realize the internal heat dissipation by combining the air cooling heat dissipation system of the external surface, improve the heat dissipation efficiency of the air cooling heat dissipation system, has little influence on the system complexity and weight of the unmanned aerial vehicle, and has high reliability.

[0021] In particular, reference is made to Figure 1 and Figure 2The heat dissipation structure of the embodiment is mainly used for an axial flux motor, and is a double-rotor motor, comprising an upper stator positioning plate 110 and a lower stator positioning plate 120, and an upper rotor 210 and a lower rotor 220 arranged above the upper stator positioning plate 110 and below the lower stator positioning plate 120 respectively, and the whole is a symmetrical structure. In this paper, the symmetrical structure is mainly described, and the other half of the symmetry is not described.

[0022] In the embodiment, the surface heat dissipation system is a wind cooling heat dissipation, and the edge positions of the upper stator positioning plate 110 and the lower stator positioning plate 120 are provided with heat dissipation fins 101. The centrifugal air duct 203 is arranged in the upper rotor 210 and the lower rotor 220, the air inlet 201 of the centrifugal air duct 203 is arranged close to the center, and the air outlet 202 is directed to the heat dissipation fin 101. When the rotor rotates, the centrifugal air flow in the centrifugal air duct 203 blows to the heat dissipation fin 101, and the edge area of the upper stator positioning plate 110 and the lower stator positioning plate 120 is cooled.

[0023] Please further refer to Figure 4 In the embodiment, the total thickness of the upper stator positioning plate 110 and the lower stator positioning plate 120 is less than the height of the segmented coil 30 of the stator, and the centrifugal air duct 203 is a guide groove structure arranged on the lower surface of the upper rotor 210 and the upper surface of the lower rotor 220, so that the segmented coil 30 can be exposed outside the upper stator positioning plate 110 and the lower stator positioning plate 120 in the whole machine. The cooling air flow in the centrifugal air duct 203 can also directly act on the upper and lower parts of the segmented coil 30, improving the cooling effect.

[0024] Most of the structure of the segmented coil 30 is wrapped in the upper stator positioning plate 110 and the lower stator positioning plate 120. In order to reduce the heat accumulation of the part wrapped inside, in the embodiment, please further refer to Figure 3 The lower stator positioning plate 120 is also provided with a heat pipe mounting groove 102 in the gap of the segmented coil positioning cabin 103, and the heat pipe 40 is fixedly installed in the heat pipe mounting groove 102 and extends radially outward. The internal heat can be conducted to the outer wall of the upper stator positioning plate 110 and the lower stator positioning plate 120 through the heat pipe 40, and the heat conducted to the outer wall is cooled by the air cooling heat dissipation system. It can be understood that the heat pipe design of the embodiment can also be applied to the water cooling heat dissipation system, that is, various outer surface heat dissipation systems of the stator positioning plate are within the protection scope of the application.

[0025] In the application, the heat pipe 40 is an L-shaped structure, comprising a radial segment and a circumferential segment in communication, the circumferential segment extends along the circumference of the motor, and the radial segment conducts the internal heat of the motor outwards. After the heat is conducted outwards, it can be further dispersed through the circumferential segment, so as to improve the heat dissipation surface and improve the heat dissipation effect.

[0026] Due to the limitation of the L-shaped structure, in the embodiment, the heat pipe 40 is arranged on the abutting surface of the upper stator positioning plate 110 and the lower stator positioning plate 120, and is fixed with the closing of the upper stator positioning plate 110 and the lower stator positioning plate 120. In an alternative embodiment, the heat pipe 40 only includes a radial section, which can be embedded in the upper stator positioning plate 110 and the lower stator positioning plate 120, and a set of heat pipes is arranged in the upper stator positioning plate 110 and the lower stator positioning plate 120 respectively, which can further improve the heat dissipation effect.

[0027] The heat transferred to the edge area of the upper stator positioning plate 110 and the lower stator positioning plate 120 by the heat pipe 40 can be further spread to the heat dissipation fins 101 and carried away by the heat dissipation airflow. In order to further improve the heat dissipation effect, in the embodiment, the heat dissipation fins 101 are also arranged in the radial direction of the motor, so that when the heat dissipation airflow blows on the heat dissipation fins 101, the airflow can form a vortex through the blockage of the heat dissipation fins 101, thereby improving the heat dissipation efficiency.

[0028] The application also provides an aircraft comprising an axial flux motor with the above heat dissipation structure, which can reduce internal heat accumulation without significantly affecting the size and weight of the motor, improve the heat dissipation effect, improve the performance release capability of the axial flux motor in the aircraft, and improve the performance of the aircraft.

[0029] The heat dissipation structure of the axial flux motor provided by the application is provided with a heat pipe mounting groove between each sub-coil positioning cabin of the upper stator positioning plate and the lower stator positioning plate, so as to fix the heat pipe in the heat pipe mounting groove. The heat pipe is arranged in the radial direction, which can conduct the internal heat to the outer wall of the stator positioning plate through the heat pipe, and the heat conducted to the outer wall can be effectively dissipated through the external surface heat dissipation design such as air cooling or water cooling, which can effectively reduce the internal heat accumulation and improve the heat dissipation effect. The heat dissipation structure of the axial flux motor can conduct the internal heat of the sub-coils of the stator to the outside through the heat pipe, reduce the internal heat accumulation, and effectively realize the internal heat dissipation by combining the air cooling heat dissipation system of the external surface, thereby improving the heat dissipation efficiency of the air cooling heat dissipation system, and having little influence on the system complexity and weight of the unmanned aerial vehicle and high reliability.

[0030] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0031] The above embodiments only express several specific implementations of the present application, which are described in a more specific and detailed manner, but should not be understood as a limitation to the protection scope of the present application. It should be noted that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A heat dissipation structure of an axial flux motor, characterized by, The application relates to an axial flux motor heat dissipation structure. The upper stator positioning plate and the lower stator positioning plate are arranged in an axial direction of the motor, and a heat pipe mounting groove is arranged between each sub-coil positioning cabin of the upper stator positioning plate and the lower stator positioning plate and extends in a radial direction. The heat pipe is fixed in the heat pipe mounting groove. The heat pipe mounting groove is arranged on a joint surface of the upper stator positioning plate and the lower stator positioning plate.

2. The heat dissipating structure of an axial flux motor according to claim 1, wherein, The heat pipe is in an L-shaped structure to form a continuous radial section and a circumferential section, and the circumferential section is arranged on the outer side of the motor.

3. The heat sink structure of an axial flux motor according to claim 2, characterized in that, The edge positions of the upper stator positioning plate and the lower stator positioning plate are further provided with heat dissipation fins, and a plurality of heat dissipation fins are arranged at intervals around the motor.

4. The heat sink structure of an axial flux machine according to claim 3, characterized in that, The application further comprises an upper rotor and a lower rotor arranged above and below the upper stator positioning plate and the lower stator positioning plate respectively.

5. The heat sink structure of an axial flux machine according to claim 4, characterized in that, The heat dissipation fins are arranged upright on the upper surface of the upper stator positioning plate and the lower surface of the lower stator positioning plate respectively. The upper rotor and the lower rotor are further provided with centrifugal air ducts, the air outlets of the centrifugal air ducts point to the heat dissipation fins, and the centrifugal air ducts can provide heat dissipation air flow when the upper rotor and the lower rotor rotate. The heat dissipation fins are further arranged to deflect in a radial direction of the motor.

6. The heat sink structure of an axial flux machine according to claim 5, wherein, The centrifugal air ducts are guide groove structures arranged on the lower surface of the upper rotor and the upper surface of the lower rotor.

7. The heat sink structure of an axial flux motor according to claim 5, wherein, The application relates to an axial flux motor heat dissipation structure.

8. An axial flux electric machine characterized by, The application relates to an axial flux motor heat dissipation structure.

9. An aircraft, characterized in that ​

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