An outer rotor brushless motor with integrated internal heat dissipation and an aircraft

Abstract

The present invention discloses an outer rotor brushless motor and aircraft with integrated internal heat dissipation, including a stator and an outer rotor, wherein the stator is provided with at least one groove, and a corresponding heat dissipation component is installed in the groove. After the heat dissipation component is installed in the corresponding groove, it can slide and shrink to the bottom, so that the arc surface of the heat dissipation component is lower than the arc surface of the stator outer ring to form a misalignment; the groove is provided with an ejection component for pushing the heat dissipation component outward from the groove. The groove structure of the present invention can allow the heat dissipation component to have a certain activity space, and can prevent the iron core from scratching the heat conductive silicone grease on the arc surface of the heat dissipation component when the iron core is installed. At the same time, the ejection component can be linked to press the entire distributed heat dissipation component to ensure that the heat dissipation component is pressed to the inner surface of the iron core with sufficient pressing force, which greatly reduces the contact thermal resistance and gives full play to the effect of the thermal conductive silicone grease.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an outer rotor brushless motor with integrated internal heat dissipation and an aircraft. Background Art

[0002] Outer rotor brushless motors have high torque, high speed, low power consumption and low noise. Therefore, electric aircraft usually use outer rotor brushless motors. Compared with aircraft powered by thermal engines, electric aircraft have low noise, are more concealed during military reconnaissance, and have higher survivability and mission success rate. Electric aircraft can be used in military reconnaissance, environmental monitoring, disaster relief and other fields.

[0003] The existing outer rotor brushless motor has the following problems:

[0004] 1. The power density of motors is getting higher and higher, and the heat dissipation problem is becoming more and more serious;

[0005] 2. For outer rotor brushless motors, there is already a design that uses fins inside the motor for heat dissipation, but the fins and stator are integrated;

[0006] 3. The fin and stator are designed in one piece. The inner wall of the iron core coil, the only heat source of the motor, is in contact with the outer wall of the stator. Due to the process requirements of motor assembly, there must be a certain gap between the diameter of the stator outer wall and the diameter of the iron core inner wall. This gap directly increases the thermal resistance of the heat transfer between the two walls, seriously affecting the heat transfer effect.

[0007] 4. In order to fill the gap between the stator outer ring wall and the core inner ring wall, you can apply thermal grease with high thermal conductivity. However, after processing, the inner and outer wall diameters are fixed. If you want to apply more grease, the gap should be larger. If the gap is small, the applied grease will be scraped off by the inner surface of the core when the core is installed, affecting the heat dissipation effect. Summary of the invention

[0008] The problem to be solved by the present invention is: to provide an outer rotor brushless motor and an aircraft with integrated internal heat dissipation, wherein the groove structure allows a certain amount of room for movement of the heat dissipation component, and can prevent the iron core from scratching the thermal grease on the curved surface of the heat dissipation component when the iron core is installed; at the same time, the ejection assembly can be linked to compress all the distributed heat dissipation components, ensuring that the heat dissipation components are pressed against the inner surface of the iron core with sufficient pressing force, thereby greatly reducing the contact thermal resistance and giving full play to the effect of the thermal grease.

[0009] The technical solution provided by the present invention for solving the above-mentioned problem is: an outer rotor brushless motor with integrated internal heat dissipation, comprising a stator and an outer rotor, wherein the stator is provided with at least one groove, a corresponding heat dissipation component is installed in the groove, and the heat dissipation component can be slid and retracted to the bottom after being installed in the corresponding groove, so that the arc surface of the heat dissipation component is lower than the arc surface of the stator outer ring to form a misalignment; an ejection component is provided in the groove for pushing the heat dissipation component outward from the groove.

[0010] Preferably, the ejection assembly includes a pressure rod, a clamping portion and a plurality of wedge-shaped blocks, the stator is provided with a plurality of vertical accommodating holes, the plurality of wedge-shaped blocks are arranged on the heat dissipation component, the groove is provided with a positioning hole that cooperates with the wedge-shaped block, the positioning hole is communicated with the accommodating hole, and the clamping portion can push the wedge-shaped block outward from the positioning hole after pressing the pressure rod downward.

[0011] Preferably, one end of the wedge-shaped block away from the heat dissipation component is an inclined surface 1, and the pressure rod is provided with an inclined surface 2 that matches the inclined surface.

[0012] Preferably, the pressure rod is provided with two accommodating grooves, boss 1 and boss 2 are provided in the accommodating grooves, and the lower ends of boss 1 and boss 2 are both provided with inclined surface 2.

[0013] Preferably, through holes are provided on the four corners of the heat dissipation component, screw holes are provided on the wedge-shaped block, screws that match the clearance of the through holes are provided in the through holes, and the screws pass through the through holes and are connected to the screw holes.

[0014] Preferably, the clamping portion is an annular pressing plate, a bolt hole 1 is provided on the annular pressing plate, a bolt hole 2 is provided at a position on the stator corresponding to the bolt hole, and the bolt hole 1 and the bolt hole 2 are matched with bolts.

[0015] Preferably, there are four grooves evenly spaced apart on the stator, and the ejection assembly is arranged between two adjacent grooves.

[0016] Preferably, the heat dissipation component is air-cooled or water-cooled.

[0017] The present invention also discloses an aircraft, comprising an outer rotor brushless motor with integrated internal heat dissipation fins as described in any one of the above.

[0018] Compared with the prior art, the advantages of the present invention are:

[0019] 1. The groove structure of the present invention can allow the heat dissipation component to have a certain amount of space for movement, and can prevent the iron core from scratching the thermal conductive silicone grease on the curved surface of the heat dissipation component when the iron core is installed.

[0020] 2. The ejection assembly of the present invention can be linked to compress all the distributed heat dissipation components to ensure that the heat dissipation components are pressed to the inner surface of the core with sufficient pressing force, greatly reducing the contact thermal resistance and giving full play to the effect of the thermal conductive silicone grease. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings described herein are used to provide further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0022] Figure 1 It is an exploded view of the present invention.

[0023] Figure 2 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 3 It is an enlarged schematic diagram of the pressure rod of the present invention.

[0025] Figure 4 It is the front view of the present invention.

[0026] Figure 5 yes Figure 4 AA section view.

[0027] Figure 6 It is an enlarged schematic diagram of the wedge block.

[0028] The accompanying drawings are marked with: 1. Clamping portion, 2. Iron core, 3. Pressure rod, 4. Receiving hole, 5. Wedge block, 6. Heat dissipation component, 7. Positioning hole, 8. Groove, 9. Bolt hole two, 10. Bolt hole one, 11. Boss one, 12. Receiving groove, 13. Boss two, 14. Inclined surface two, 15. Inclined surface one, 16. Stator, 17. Screw hole, 18. Through hole. DETAILED DESCRIPTION

[0029] The following will describe the implementation methods of the present invention in detail with reference to the accompanying drawings and embodiments, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0030] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral", "longitudinal", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0032] In the present invention, unless otherwise specified and limited, the terms "assemble", "connect", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can also be a mechanical connection; it can be directly connected, or it can be connected through an intermediate medium, or the two elements can be internally connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] The specific implementation example of the present invention is Figure 1-6 As shown, an outer rotor brushless motor with integrated internal heat dissipation includes a stator 16 and an outer rotor, wherein the stator 16 is provided with at least one groove 8, and a corresponding heat dissipation component 6 is installed in the groove 8. After the heat dissipation component 6 is installed in the corresponding groove 8, it can slide and shrink to the bottom, so that the arc surface of the heat dissipation component 6 is lower than the arc surface of the outer ring of the stator 16 to form a misalignment; the groove 8 is provided with an ejection component for pushing the heat dissipation component 6 outward from the groove 8.

[0034] In this embodiment, the ejection assembly includes a pressure rod 3, a clamping portion 1 and a plurality of wedge blocks 5. The stator 16 is provided with a plurality of vertical accommodating holes 4. The plurality of wedge blocks 5 are arranged on the heat dissipation component 6. The groove 8 is provided with a positioning hole 7 that cooperates with the wedge block 5. The positioning hole 7 is communicated with the accommodating hole 4. After the clamping portion 1 presses the pressure rod 3 downward, the wedge block 5 can be pushed outward from the positioning hole 7.

[0035] In this embodiment, one end of the wedge block 5 away from the heat dissipation component 6 is an inclined surface 15, and the pressure rod 3 is provided with an inclined surface 2 14 matching the inclined surface.

[0036] In this embodiment, specifically, Figure 3 As shown, the pressure rod 3 is provided with two accommodating grooves 12, and the accommodating grooves 12 are provided with a boss 11 and a boss 2 13, and the lower ends of the boss 11 and the boss 2 13 are both provided with the inclined surface 2

[0037] In this embodiment, through holes 18 are provided at the four corners of the heat dissipation component 6, and screw holes 17 are provided on the wedge block 5. Screws that are clearance-matched with the through holes 18 are provided in the through holes 18, and the screws pass through the through holes 18 and are connected to the screw holes 17. The clearance between the screws and the through holes enables the wedge block to tilt within a certain range, making it convenient for the wedge block to be placed in the positioning hole.

[0038] In this embodiment, the clamping portion 1 is an annular pressure plate, on which a bolt hole 10 is provided, and a bolt hole 2 9 is provided at a position corresponding to the bolt hole on the stator 16, and the bolt hole 10 and the bolt hole 2 9 are matched with bolts.

[0039] In this embodiment, there are four grooves 8 which are evenly spaced and distributed on the stator 16 , and the ejection assembly is disposed between two adjacent grooves 8 .

[0040] In this embodiment, the heat dissipation component 6 is air-cooled or water-cooled.

[0041] The present invention also discloses an aircraft, comprising an outer rotor brushless motor with integrated internal heat dissipation fins as described in any one of the above.

[0042] Before the core 2 is installed, each heat dissipation component can be slid and retracted to the bottom after being installed into the corresponding groove, so that the arc surface of the heat dissipation component is misaligned with the arc surface of the stator outer ring. This misalignment gap is sufficient to apply a certain thickness of thermal grease, and during the process of installing the core 2, ensure that the inner wall surface of the core 2 will not be scratched by the applied grease.

[0043] Specifically, a pressure rod is directly arranged between every two heat dissipation component grooves on the stator. The pressure rod has an inclined surface that cooperates with the wedge blocks of two adjacent heat dissipation components. The pressure rod can move up and down in the accommodating hole. There is an integral annular cover plate on the top of the stator, which is used to press the four pressure rods. When the four pressure rods are pressed into a specific size, the inclined surface 2 on the boss 1 and the boss 2 cooperates with the inclined surface 1 on the wedge block to press the wedge block on the heat dissipation component, so that the four heat dissipation components are pushed from the inside to the outside in the radial direction, and finally the arc surface of the heat dissipation component is pressed against the inner wall surface of the iron core 2. In this way, it is ensured that there is enough positive pressure to make the four heat dissipation components bear against the inner wall surface of the iron core 2 in their respective directions. The pressing effect greatly reduces the contact thermal resistance, thereby improving the thermal conductivity between the contact surfaces.

[0044] The above description is only for the best embodiment of the present invention, but it should not be understood as limiting the claims. The present invention is not limited to the above embodiments, and its specific structure is allowed to be changed. All changes made within the scope of protection of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. An outer rotor brushless motor with integrated internal heat dissipation, comprising a stator (16) and an outer rotor, characterized in that: The stator (16) is provided with at least one groove (8), a corresponding heat dissipation component (6) is installed in the groove (8), and the heat dissipation component (6) can be slid and retracted to the bottom after being installed in the corresponding groove (8), so that the arc surface of the heat dissipation component (6) is lower than the arc surface of the outer ring of the stator (16) to form a misalignment; the groove (8) is provided with an ejection component for pushing the heat dissipation component (6) outward from the groove (8); The ejection assembly comprises a pressure rod (3), a clamping portion (1) and a plurality of wedge blocks (5); the stator (16) is provided with a plurality of vertical receiving holes (4); the plurality of wedge blocks (5) are arranged on the heat dissipation component (6); a positioning hole (7) cooperating with the wedge block (5) is provided in the groove (8); the positioning hole (7) is communicated with the receiving hole (4); and the clamping portion (1) can push the wedge block (5) outward from the positioning hole (7) after pressing the pressure rod (3) downward.

2. The outer rotor brushless motor with integrated internal heat dissipation according to claim 1, characterized in that: One end of the wedge block (5) away from the heat dissipation component (6) is an inclined surface 1 (15), and the pressure rod (3) is provided with an inclined surface 2 (14) matching the inclined surface.

3. The outer rotor brushless motor with integrated internal heat dissipation according to claim 2, characterized in that: The pressure rod (3) is provided with two accommodating grooves (12), and a boss 1 (11) and a boss 2 (13) are arranged in the accommodating grooves (12), and the lower ends of the boss 1 (11) and the boss 2 (13) are both provided with the inclined surface 2 (14).

4. The outer rotor brushless motor with integrated internal heat dissipation according to claim 1, characterized in that: The heat dissipation component (6) is provided with through holes (18) at four corners, the wedge block (5) is provided with screw holes (17), the through holes (18) are provided with screws that are clearance-matched with the through holes (18), and the screws pass through the through holes (18) and are connected to the screw holes (17).

5. The outer rotor brushless motor with integrated internal heat dissipation according to claim 1, characterized in that: The clamping portion (1) is an annular pressing plate, on which a bolt hole (10) is provided, and a bolt hole (9) is provided at a position on the stator (16) corresponding to the bolt hole, and the bolt hole (10) and the bolt hole (9) are matched with each other by bolts.

6. The outer rotor brushless motor with integrated internal heat dissipation according to claim 1, characterized in that: There are four grooves (8) which are evenly spaced and distributed on the stator (16); the ejection assembly is arranged between two adjacent grooves (8).

7. The outer rotor brushless motor with integrated internal heat dissipation according to claim 1, characterized in that: The heat dissipation component (6) is air-cooled or water-cooled.

8. An aircraft, characterized in that: An outer rotor brushless motor with integrated internal heat dissipation as described in any one of claims 1-7.

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