Brushless motor and unmanned aerial vehicle

Abstract

The invention discloses a brushless motor and an unmanned aerial vehicle, and relates to the technical field of brushless motors, the brushless motor comprises an iron core, an annular pressing plate, a stator, a plurality of heat dissipation modules and a pressing structure, the stator comprises a stator frame and a plurality of partition plates, the partition plates are arranged at intervals in the circumferential direction with the center of the stator frame as the original point, and a mounting groove is formed between every two adjacent partition plates; the heat dissipation module is movably arranged in the mounting groove; the pressing structure comprises two inclined plane groups, one inclined plane group is arranged on one of the heat dissipation module and the partition plate, the other inclined plane group is arranged on the other one of the heat dissipation module and the partition plate, and the two inclined plane groups are matched with each other. Therefore, the heat dissipation module and the inner wall surface of the iron core can be ensured to be pressed tightly, the lightweight design of the brushless motor is greatly improved, and meanwhile, since the number of parts in the existing brushless motor is reduced, the assembly process can be simplified and the manufacturing cost can be reduced.

Description

Technical Field

[0001] This invention relates to the field of brushless motor technology, specifically to a brushless motor and a drone. Background Technology

[0002] A brushless motor is an electric motor that uses electronic commutation technology to replace traditional mechanical brushes and commutators, and features high efficiency, long lifespan, and low noise.

[0003] According to an existing publicly available patent, authorized publication number CN113746233B, a brushless motor and aircraft with an internally integrated heat dissipation module are provided. The motor includes a stator, an outer rotor (specifically an iron core), a heat dissipation module, a pressure rod, a wedge block, and an annular pressure plate. During assembly, the pressure rod, wedge block, and annular pressure plate are sequentially mounted on the stator. The interaction between the pressure rod, wedge block, and annular pressure plate causes the heat dissipation module to be pushed radially from the inside out, ultimately pressing the arc-shaped surface of the heat dissipation module against the inner wall of the iron core. This ensures sufficient positive pressure to hold the four heat dissipation modules against the inner wall of the iron core in their respective directions. This pressing action greatly reduces the contact thermal resistance, thereby improving the thermal conductivity between the contact surfaces.

[0004] Although the existing technology described above can ensure that the arc surface of the heat dissipation module is pressed tightly against the inner wall of the iron core by the cooperation between the pressure rod, wedge block and annular pressure plate, the pressure rod and wedge block will affect the lightweight design of the brushless motor. At the same time, the presence of the pressure rod and wedge block will lead to structural complexity, which in turn will lead to complex assembly process and high manufacturing cost. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a brushless motor and a drone to solve the technical problems of existing brushless motors in the background art, which have complex structures, leading to complex assembly processes and high manufacturing costs.

[0006] One aspect of the present invention is to provide a brushless motor, including an iron core, an annular pressure plate, a stator, multiple heat dissipation modules, and a clamping structure.

[0007] The stator includes a stator frame and a plurality of partitions, the plurality of partitions being circumferentially spaced with the center of the stator frame as the origin, to form a mounting groove between each pair of adjacent partitions; The heat dissipation module is movably disposed within the mounting slot; The clamping structure includes two inclined surface groups. One inclined surface group is disposed on one of the heat dissipation module and the partition, and the other inclined surface group is disposed on the other of the heat dissipation module and the partition, wherein the two inclined surface groups cooperate with each other. When the annular pressure plate drives the heat dissipation module to press downward, the inclined surfaces between the two inclined surfaces work together to drive the heat dissipation module to move radially outward and press it against the inner wall of the iron core.

[0008] Furthermore, the heat dissipation module includes multiple heat dissipation fins and a heat dissipation fin body with an arc-shaped heat-conducting surface; One end of each of the heat dissipation fins is connected to the arc-shaped heat-conducting surface to form a heat dissipation area on the heat dissipation fin body, and the other end of each of the heat dissipation fins is spaced apart from the surface of the heat dissipation fin body to form a non-heat dissipation area on the heat dissipation fin body. The projection coverage of the annular pressure plate completely covers the non-heat dissipation area.

[0009] Furthermore, the plurality of heat dissipation fins are spaced apart along the arcuate direction of the arcuate heat-conducting surface to form a heat dissipation channel between each pair of adjacent heat dissipation fins. The multiple heat dissipation channels together form a heat dissipation area.

[0010] Furthermore, one end of each of the heat dissipation fins is integrally connected to the arc-shaped heat-conducting surface.

[0011] Furthermore, the multiple heat dissipation fins are arranged in a non-parallel manner.

[0012] Furthermore, the clamping structure includes a first inclined plane group and a second inclined plane group; The two first inclined surfaces in the first inclined surface group are respectively located on opposite sides of the heat sink body, and the two second inclined surfaces in the second inclined surface group are respectively located on opposite edges of the two adjacent partitions.

[0013] Furthermore, the height of a portion of each partition near the stator frame changes from high to low and then extends horizontally to form a horizontal portion opposite to the heat dissipation module and a positioning inclined portion opposite to the annular pressure plate on the partition. The annular pressure plate is provided with positioning holes corresponding to the positioning inclined portion.

[0014] Furthermore, the brushless motor also includes a cover with a fan for mounting on the stator.

[0015] Furthermore, the cover includes a lower cover and an upper cover that are detachably connected from bottom to top, and the fan is located between the lower cover and the upper cover.

[0016] Another aspect of the present invention is to provide a drone, including a drone body and the aforementioned brushless motor, the brushless motor being mounted on the drone body.

[0017] Compared with the prior art, the brushless motor shown in this invention has the following advantages: The stator and clamping structure shown in this application allow for efficient assembly of the core and heat dissipation modules. The stator contains a stator frame and multiple partitions, with these partitions spaced circumferentially around the center of the stator frame. This creates mounting slots between adjacent partitions. Specifically, the upper part of the mounting slot is open, allowing the heat dissipation modules to be assembled from top to bottom. Compared to existing methods that horizontally push the heat dissipation modules into the stator, this method simplifies operation, enabling multiple heat dissipation modules to be pre-installed into their respective mounting slots at once, while ensuring optimal fit between each heat dissipation module and each mounting slot. Finally, the annular pressure plate is assembled with the stator, so that the annular pressure plate applies downward pressure to each heat dissipation module. Through the cooperation of the first and second inclined groups in the pressing structure, the heat dissipation module can be driven to move radially outward, so as to press the heat dissipation module with the inner wall of the iron core, avoiding gaps in the thermal grease between the iron core and the heat dissipation module. With this setting, the heat dissipation module can be pressed with the inner wall of the iron core without the use of the pressure rod and wedge block in the existing brushless motor, which greatly improves the lightweight design of the brushless motor. At the same time, since the number of parts in the existing brushless motor is reduced, the assembly process can be simplified and the manufacturing cost can be reduced. Attached Figure Description

[0018] Figure 1 This is an exploded view of a brushless motor according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the assembly of a brushless motor in one embodiment of the present invention; Figure 3 for Figure 2 Side view; Figure 4 for Figure 3 A three-dimensional half-section view of the AA section; Figure 5 This is an assembly diagram of the annular pressure plate and the stator in one embodiment of the present invention; Figure 6 This is a schematic diagram of the mounting groove in one embodiment of the present invention; Figure 7 This is a perspective view of the heat dissipation module in one embodiment of the present invention; Figure 8 This is a perspective view of the heat dissipation module and stator in one embodiment of the present invention.

[0019] In the diagram: 100, iron core; 200, stator; 210, stator frame; 220, partition plate; 221, horizontal section; 222, positioning inclined section; 230, mounting slot; 300, heat dissipation module; 310, heat dissipation fins; 320, heat dissipation fin body; 321, arc-shaped heat conduction surface; 330, heat dissipation area; 340, non-heat dissipation area; 400, clamping structure; 410, first inclined surface group; 420, second inclined surface group; 500, cover; 510, fan; 520, lower cover; 530, upper cover; 600, annular pressure plate; 610, positioning hole. Detailed Implementation

[0020] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Several embodiments of the invention are illustrated in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0021] It should be noted that when a component is said to be "fixed to" another component, it can be directly on the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0022] 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 invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0023] First Embodiment Please see Figures 1 to 8 The image shows a brushless motor in the first embodiment of the present invention, including an iron core 100, an annular pressure plate 600, a stator 200, multiple heat dissipation modules 300 and a pressing structure 400. It should be noted that the brushless motor is not limited to the iron core 100, annular pressure plate 600, stator 200, multiple heat dissipation modules 300 and clamping structure 400 shown in this embodiment, but also includes other components that constitute the brushless motor. Since other components are conventional prior art in this field, they will not be specifically described here.

[0024] It should also be noted that during the assembly of the brushless motor, thermal grease needs to be applied between the heat dissipation module 300 and the iron core 100. The core function of the thermal grease is to fill the microscopic gaps between the contact surfaces of the two and remove air, thereby significantly improving the efficiency of heat transfer from the iron core 100 to the heat dissipation module 300. Therefore, in the existing assembly process of brushless motors, the heat dissipation module 300 and the inner wall of the iron core 100 need to be pressed together to avoid gaps in the thermal grease between the iron core 100 and the heat dissipation module 300.

[0025] In this embodiment, to address the technical problems of complex structure, complex assembly process, and high manufacturing cost of existing brushless motors, the stator 200 includes a stator frame 210 and multiple partitions 220. The multiple partitions 220 are circumferentially spaced with the center of the stator frame 210 as the origin, forming a mounting groove 230 between each pair of adjacent partitions 220. The heat dissipation module 300 is movably disposed within the mounting groove 230. The clamping structure 400 includes two inclined surface groups. One inclined surface group is disposed on one of the heat dissipation module 300 and partitions 220, and the other inclined surface group is disposed on the other side of the heat dissipation module 300 and partitions 220. The two inclined surface groups cooperate with each other. When the annular pressure plate 600 drives the heat dissipation module 300 to press downward, the inclined surface cooperation between the two inclined surface groups drives the heat dissipation module 300 to move radially outward and press against the inner wall of the iron core 100.

[0026] Specifically, through the stator 200 and clamping structure 400 shown in this application, during the assembly process of the core 100 and the heat dissipation module 300, the stator 200 has a stator frame 210 and multiple partitions 220, and the multiple partitions 220 are circumferentially spaced with the center of the stator frame 210 as the origin, so that a mounting groove 230 is formed between each pair of adjacent partitions 220. Specifically, the upper part of the mounting groove 230 is an open structure, which allows the heat dissipation module 300 to be assembled from top to bottom into the inside of the mounting groove 230. Compared with the existing method of horizontally pushing the heat dissipation module into the stator, this method is simpler to operate, achieving the goal of pre-installing multiple heat dissipation modules 300 into their respective mounting grooves 230 at one time, and also ensuring that each heat dissipation module 300 is in contact with each mounting groove 230. To achieve optimal fit, the annular pressure plate 600 is then assembled with the stator 200, so that the annular pressure plate 600 applies downward pressure to each heat dissipation module 300. Through the mutual cooperation of the first inclined surface group 410 and the second inclined surface group 420 in the pressing structure 400, the heat dissipation module 300 can be driven to move radially outward, thereby pressing the heat dissipation module 300 against the inner wall of the iron core 100. This prevents the thermal grease from forming gaps between the iron core 100 and the heat dissipation module 300. With this setting, the heat dissipation module 300 can be pressed against the inner wall of the iron core 100 without the use of the pressure rod and wedge block in the existing brushless motor, which greatly improves the lightweight design of the brushless motor. At the same time, by reducing the number of parts in the existing brushless motor, the assembly process can be simplified and the manufacturing cost can be reduced.

[0027] Specifically, for a better understanding of this case, please refer to [link / reference]. Figure 8 As shown, the clamping structure includes a first inclined surface group 410 and a second inclined surface group 420. The two first inclined surfaces in the first inclined surface group 410 are respectively located on opposite sides of the heat sink body 320, and the two second inclined surfaces in the second inclined surface group 420 are respectively located on opposite edges of two adjacent partitions 220.

[0028] For a better understanding of this case, please refer to [link / reference]. Figure 7 As shown, the heat dissipation module 300 includes multiple heat dissipation fins 310 and a heat dissipation fin body 320 with an arc-shaped heat-conducting surface 321. One end of each heat dissipation fin 310 is connected to the arc-shaped heat-conducting surface 321 to form a heat dissipation area 330 on the heat dissipation fin body 320, and the other end of each heat dissipation fin 310 is spaced apart from the surface of the heat dissipation fin body 320 to form a non-heat dissipation area 340 on the heat dissipation fin body 320. Among them, the projection coverage of the annular pressure plate 600 completely covers the non-heat dissipation area 340.

[0029] Specifically, multiple heat dissipation fins 310 are spaced apart along the arc direction of the arc-shaped heat-conducting surface 321 to form a heat dissipation channel between each pair of adjacent heat dissipation fins 310. The multiple heat dissipation channels together form a heat dissipation area 330. In order to ensure the overall strength of the heat dissipation module 300, one end of each heat dissipation fin 310 is integrally connected to the arc-shaped heat-conducting surface 321. At the same time, in order to adapt to the forming process of the heat dissipation fins 310, the multiple heat dissipation fins 310 are not arranged in parallel. In some preferred embodiments, the multiple heat dissipation fins 310 can be arranged in parallel on the heat dissipation body.

[0030] It should be noted that during assembly, specifically, the arc-shaped heat-conducting surface 321 is pressed tightly against the inner wall of the iron core 100, and... Figure 7 The bold dashed line shown represents the boundary between the heat dissipation area 330 and the non-heat dissipation area 340.

[0031] In some preferred embodiments, the brushless motor also includes a cover 500 with a fan 510, which is used to mount on the stator 200. Specifically, the cover 500 includes a lower cover 520 and an upper cover 530 that are detachably connected from bottom to top, and the fan 510 is located between the lower cover 520 and the upper cover 530.

[0032] Please see Figure 4 As shown, the rotation of fan 510 creates a negative pressure zone, causing airflow to rise from bottom to top and pass through the heat sink fins 310 before being exhausted from the exhaust port of fan 510, thus cooling the heat sink fins 310. Specifically... Figure 4 The gas transport path is marked by the arrow.

[0033] It should also be noted that, given the non-heat-dissipating area 340 formed on the heat sink body 320, the annular pressure plate 600 completely covers the non-heat-dissipating area 340, and the cooperation of the bottom baffle on the stator frame 210, it should be noted that the bottom baffle of the stator frame 210 also completely covers the non-heat-dissipating area 340, ensuring that airflow can only pass through the heat dissipation channel. This arrangement can prevent heat dissipation from deteriorating the cooling effect of the heat sink fins 310. For details, please refer to [link to relevant documentation]. Figure 6 and Figure 8 As shown.

[0034] To facilitate the assembly of the annular pressure plate 600, in some other preferred embodiments, the height of a portion of each partition 220 near the stator frame 210 changes from high to low and then extends horizontally, so as to form a horizontal portion 221 opposite to the heat dissipation module 300 and a positioning inclined portion 222 opposite to the annular pressure plate 600 on the partition 220. The annular pressure plate 600 is provided with a positioning hole 610 corresponding to the positioning inclined portion 222.

[0035] Please refer to details. Figure 5 and Figure 8 As shown, by setting the horizontal part 221 and the positioning tilt part 222, the top of the heat dissipation module 300 can be flush with the horizontal part 221, and the positioning tilt part 222 can be aligned with the positioning hole 610, so as to position the annular pressure plate 600 through the positioning tilt part 222 and ensure that the annular pressure plate 600 and the stator 200 are precisely assembled.

[0036] It should be noted that the annular pressure plate 600 can be installed with the stator 200 by bolts or screws.

[0037] In summary, the brushless motor in the first embodiment of the present invention has at least the following beneficial effects compared with the brushless motor in the prior art: The stator 200 and clamping structure 400 shown in this application enable the stator 200 to have a stator frame 210 and multiple partitions 220 in its stator frame 210. These partitions are circumferentially spaced around the center of the stator frame 210, forming mounting grooves 230 between adjacent partitions 220. Specifically, the upper part of the mounting groove 230 is open, allowing the heat dissipation module 300 to be assembled from top to bottom inside the mounting groove 230. Compared to the existing method of horizontally pushing the heat dissipation module into the stator, this method simplifies operation, allowing multiple heat dissipation modules 300 to be pre-installed into their respective mounting grooves 230 at once, while also ensuring that each heat dissipation module 300 is properly seated in each mounting groove 230. Optimal fit; finally, the annular pressure plate 600 is assembled with the stator 200, so that the annular pressure plate 600 applies downward pressure to each heat dissipation module 300. Through the mutual cooperation of the first inclined surface group 410 and the second inclined surface group 420 in the pressing structure 400, the heat dissipation module 300 can be driven to move radially outward, so that the heat dissipation module 300 is pressed against the inner wall surface of the iron core 100, avoiding gaps in the thermal grease between the iron core 100 and the heat dissipation module 300. Through this setting, the heat dissipation module 300 can be pressed against the inner wall surface of the iron core 100 without the use of the pressure rod and wedge block in the existing brushless motor, which greatly improves the lightweight design of the brushless motor. At the same time, since the number of parts in the existing brushless motor is reduced, the assembly process can be simplified and the manufacturing cost can be reduced.

[0038] Second Embodiment The second embodiment of the present invention provides a drone, including a drone body and the brushless motor in the first embodiment described above, the brushless motor being mounted on the drone body.

[0039] By assembling the brushless motor shown in the first embodiment into the drone body, the weight of the drone can be reduced, which is beneficial to the lightweight design of the drone.

[0040] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] The above embodiments merely illustrate several implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A brushless motor, comprising an iron core and an annular pressure plate, characterized in that, Also includes: The stator includes a stator frame and a plurality of partitions, the plurality of partitions being circumferentially spaced about the center of the stator frame to form a mounting groove between each pair of adjacent partitions; Multiple heat dissipation modules are movably disposed within the mounting slot; The pressing structure includes two inclined surface groups, one of which is disposed on one of the heat dissipation module and the partition, and the other of which is disposed on the other of the heat dissipation module and the partition, wherein the two inclined surface groups cooperate with each other; When the annular pressure plate drives the heat dissipation module to press downward, the inclined surfaces between the two inclined surfaces work together to drive the heat dissipation module to move radially outward and press it against the inner wall of the iron core.

2. The brushless motor according to claim 1, characterized in that: The heat dissipation module includes multiple heat dissipation fins and a heat dissipation fin body with an arc-shaped heat-conducting surface; One end of each of the heat dissipation fins is connected to the arc-shaped heat-conducting surface to form a heat dissipation area on the heat dissipation fin body, and the other end of each of the heat dissipation fins is spaced apart from the surface of the heat dissipation fin body to form a non-heat dissipation area on the heat dissipation fin body. The projection coverage of the annular pressure plate completely covers the non-heat dissipation area.

3. The brushless motor according to claim 2, characterized in that: The plurality of heat dissipation fins are spaced apart along the arc direction of the arc-shaped heat conduction surface to form a heat dissipation channel between each pair of adjacent heat dissipation fins; The multiple heat dissipation channels together form a heat dissipation area.

4. The brushless motor according to claim 2, characterized in that: One end of each of the heat dissipation fins is integrally connected to the arc-shaped heat-conducting surface.

5. The brushless motor according to claim 2, characterized in that: The heat dissipation fins are arranged in a non-parallel manner.

6. The brushless motor according to claim 2, characterized in that: The clamping structure includes a first inclined plane group and a second inclined plane group; The two first inclined surfaces in the first inclined surface group are respectively located on opposite sides of the heat sink body, and the two second inclined surfaces in the second inclined surface group are respectively located on opposite edges of the two adjacent partitions.

7. The brushless motor according to claim 1, characterized in that: Each of the partitions has a portion of its height that changes from high to low near the stator frame and then extends horizontally to form a horizontal portion opposite to the heat dissipation module and a positioning inclined portion opposite to the annular pressure plate on the partition. The annular pressure plate is provided with positioning holes corresponding to the positioning inclined portion.

8. The brushless motor according to claim 1, characterized in that: The brushless motor also includes a cover with a fan for mounting on the stator.

9. The brushless motor according to claim 8, characterized in that, The cover includes a lower cover and an upper cover that are detachably connected from bottom to top, and the fan is located between the lower cover and the upper cover.

10. An unmanned aerial vehicle (UAV), characterized in that: The device includes a drone body and a brushless motor as described in any one of claims 1-9, wherein the brushless motor is used to be mounted on the drone body.

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