UAV power motor and UAV

Abstract

The present invention discloses a UAV power motor and a UAV, belonging to the field of motor technology. The UAV power motor includes an outer rotor, a stator and a stator core, wherein the outer rotor is rotatably mounted on the stator; and also includes a plurality of heat sinks; the stator core is sleeved on the stator, and a mounting structure matching the number of heat sinks is provided on the inner ring wall of the stator core; the mounting structure includes two positioning edges, and positioning grooves matching the positioning edges are provided on both sides of the heat sink, and one side of the heat sink is tightly attached to the inner ring wall of the stator core to conduct the heat generated by the stator core and the coil to the heat sink, and the contact surface between the heat sink and the inner ring wall of the stator core is coated with thermal conductive silicone grease. The present invention can improve the heat dissipation effect while ensuring that the thermal conductive silicone grease on the surface of the heat sink will not be scraped off; and the positioning edge also has a heat conduction effect, thereby increasing the thermal contact area between the stator core and the heat sink, thereby further improving the heat dissipation effect.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a UAV power motor and a UAV. Background Art

[0002] Electric aircraft use electricity as all or part of the energy for the propulsion system, which is an important symbol of the "third aviation" era. It will usher in a new round of innovation and reform in the aviation field, promote the development of green aviation, and have a revolutionary impact on the world's aviation industry. In electric aircraft, the motor is a key part of the power system and determines the reliability of the aircraft.

[0003] The motor will generate heat during operation. The main heat sources are the iron loss generated by the core and the copper loss generated by the winding. The copper loss generated by the winding has the greatest impact. Generally, the performance of the motor depends on the heat dissipation capacity of the motor. In order to improve the power density of the motor, the motor is usually cooled by air.

[0004] However, the existing outer rotor brushless motors have the following problems: For outer rotor brushless motors, there are designs that use fins inside the motor for heat dissipation, but the fins and stator are integrated. In the integrated design of fins and stators, the inner wall surface of the iron core coil, the only heat source of the motor, contacts with the outer ring wall surface of the stator. Due to the process requirements of motor assembly, there must be a certain gap between the diameter of the stator outer ring wall surface and the diameter of the iron core inner ring wall surface. This gap directly and greatly increases the thermal resistance of the heat transfer between the two walls, seriously affecting the heat transfer effect; in order to fill the gap between the stator outer ring wall surface and the iron core inner ring wall surface, high thermal conductivity thermal conductive silicone grease can be applied to the stator outer ring wall surface and the iron core inner ring wall surface, but the inner and outer wall diameters are fixed after processing. If more silicone grease is applied, the gap should be larger. If the gap is small, a lot of silicone grease will be scraped off by the inner avoidance surface of the iron core when the silicone grease is installed into the iron core, affecting the heat dissipation effect. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a UAV power motor and a UAV, by installing the heat sink on the stator core in a manner of cooperating with positioning ribs and positioning grooves, thereby reducing the installation gap and improving the heat dissipation effect. On the other hand, it can also ensure that the thermal grease on the surface of the heat sink will not be scraped off; and the positioning ribs also have a heat conduction effect, thereby increasing the thermal contact area between the stator core and the heat sink, thereby further improving the heat dissipation effect.

[0006] The technical solution provided by the present invention to solve the above problems is: a UAV power motor, including an outer rotor, a stator and a stator core, wherein the outer rotor is rotatably mounted on the stator; and also includes a plurality of heat sinks;

[0007] The stator core is sleeved on the stator, and the inner ring wall of the stator core is provided with a mounting structure matching the number of heat sinks;

[0008] The mounting structure includes two positioning edges, and positioning grooves cooperating with the positioning edges are arranged on both sides of the heat sink. One side surface of the heat sink is in close contact with the inner ring wall of the stator core to conduct the heat generated by the stator core and the coil to the heat sink, and the contact surface between the heat sink and the inner ring wall of the stator core is coated with thermal conductive silicone grease.

[0009] Preferably, the heat sink comprises a conductor and a plurality of heat dissipation fins, the side of the conductor in contact with the inner ring wall of the stator core is an arc-shaped heat transfer surface, the plurality of heat dissipation fins are arranged on the side of the conductor away from the stator core, and the positioning grooves are arranged on both sides of the conductor.

[0010] Preferably, the heat dissipation fins and the conductor are integrally formed.

[0011] Preferably, conductive plates are provided on both sides of the conductive body, the conductive plates and the conductive body are integrally formed, and one side surface of the conductive plate contacts the side end surface of the positioning edge to conduct the heat generated by the stator core and the coil to the heat sink through the positioning edge.

[0012] Preferably, an inclined surface 1 is provided on one side of the conduction plate, and an inclined surface 2 is provided on one side of the positioning edge. The inclined surface 1 and the inclined surface 2 are tightly fitted with each other, and the inclined surface 1 is coated with thermal conductive silicone grease.

[0013] Preferably, a matching cavity for accommodating a heat sink is provided on the stator.

[0014] Preferably, a locking assembly is provided in the mating cavity, and the locking assembly is used to radially lock the heat sink after the heat sink enters the mating cavity.

[0015] Preferably, the locking assembly includes a locking head and a locking spring, a mounting groove is provided on the cavity wall of the mating cavity, one end of the locking spring is fixedly connected to the bottom of the mounting groove, and the other end is fixedly connected to the locking head, and an inclined surface three is provided at one end of the locking head away from the locking spring and extends out of the mounting groove, mating blocks are provided on both sides of the heat sink, and an inclined surface four mating with the inclined surface three is provided on the mating block.

[0016] Preferably, a centrifugal fan and an air outlet are provided on the upper portion of the outer rotor, and when the centrifugal fan rotates, the hot air flow passing through the heat sink is blown out from the air outlet.

[0017] The present invention also discloses a UAV, comprising a UAV power motor as described in any one of the above items.

[0018] Compared with the prior art, the advantages of the present invention are as follows: the present invention installs the heat sink on the stator core by means of positioning ribs and positioning grooves, so that the heat sink is in direct contact with the stator core, thereby reducing the installation gap and improving the heat dissipation effect. On the other hand, it can also ensure that the thermal grease on the surface of the heat sink will not be scraped off; and the positioning ribs also have a heat conduction effect, thereby increasing the thermal contact area between the stator core and the heat sink, thereby further improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 It is a front view of the present invention;

[0021] Figure 2 It is a schematic diagram of the exploded three-dimensional structure of the present invention;

[0022] Figure 3 It is a top view of the stator core and the heat sink of the present invention;

[0023] Figure 4 is a top view of a stator of the present invention;

[0024] Figure 5 is a top view of the stator core of the present invention;

[0025] Figure 6 yes Figure 3 The enlarged schematic diagram of point A in the middle;

[0026] Figure 7 is a top view of the heat sink of the present invention;

[0027] Figure 8 It is a cross-sectional view of the matching block and the locking head of the present invention.

[0028] The accompanying drawings are marked with: 1. outer rotor, 2. air outlet, 3. conductor, 4. heat dissipation fins, 5. conduction plate, 6. positioning groove, 7. matching block, 8. stator core, 9. matching cavity, 10. stator, 11. positioning edge, 12. inclined surface two, 13. inclined surface one, 14. locking head, 15. locking spring, 16. mounting groove, 17. inclined surface three, 18. inclined surface four, 19. arc-shaped heat transfer surface. 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] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0034] It should also be understood that the terms used in this description of the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present invention. As used in the description of the embodiments of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms of "a", "an" and "the" are intended to include plural forms. Example 1

[0035] like Figure 1 and Figure 2 As shown, this embodiment discloses a UAV power motor, including an outer rotor 1, a stator 10 and a stator core 8, wherein the outer rotor 1 is rotatably mounted on the stator 10; and further includes a plurality of heat sinks;

[0036] The stator core 8 is mounted on the stator 10, and the inner ring wall of the stator core 8 is provided with a mounting structure matching the number of heat sinks;

[0037] The mounting structure includes two positioning edges 11, and positioning grooves 6 cooperating with the positioning edges 11 are provided on both sides of the heat sink. One side surface of the heat sink is in close contact with the inner ring wall of the stator core 8 to conduct the heat generated by the stator core 8 and the coil to the heat sink, and the contact surface between the heat sink and the inner ring wall of the stator core 8 is coated with thermal conductive silicone grease.

[0038] In the above scheme, the heat sink is installed on the stator core 8 by means of the positioning edge 11 and the positioning groove 6. The heat sink is in direct contact with the stator core 8, which reduces the installation gap and improves the heat dissipation effect. On the other hand, it can also ensure that the thermal grease on the surface of the heat sink will not be scraped off. In addition, the positioning edge 11 also has a heat conduction effect, thereby increasing the thermal contact area between the stator core 8 and the heat sink, thereby further improving the heat dissipation effect.

[0039] In this embodiment, specifically, Figure 2 and Figure 7 As shown, the heat sink comprises a conductor 3 and a plurality of heat dissipation fins 4, the conductor 3 having a side in contact with the inner ring wall of the stator core 8 being an arc-shaped heat transfer surface 20, the plurality of heat dissipation fins 4 being arranged on the side of the conductor 3 away from the stator core 8, and the positioning grooves 6 being arranged on both sides of the conductor 3. In order to improve the structural strength and heat transfer effect between the heat dissipation fins and the conductor, the heat dissipation fins 4 and the conductor 3 are processed by an integrated molding process, and the cooperation of the conductor and the heat dissipation fins can efficiently and timely transfer the heat generated by the stator core and the coil.

[0040] Furthermore, conductive plates 5 are provided on both sides of the conductive body 3, the conductive plates 5 are integrally formed with the conductive body 3, and one side of the conductive plate 5 contacts the side end surface of the positioning rib 11 to conduct the heat generated by the stator core 8 and the coil to the heat sink through the positioning rib 11. Furthermore, an inclined surface 13 is provided on one side of the conductive plate 5, and an inclined surface 2 12 is provided on one side of the positioning rib 11, the inclined surface 13 and the inclined surface 2 12 are closely fitted with each other, and the inclined surface 13 is coated with thermal conductive silicone grease.

[0041] The specific installation method between the heat sink and the stator core 8 is as follows: the arcuate heat transfer surface 19 of the heat sink is coated with thermal grease, and then the heat sink is placed in the middle of the stator core 8 and the arcuate heat transfer surface 19 of the heat sink is facing the inner ring wall of the stator core 8, and then the positioning grooves 6 on both sides of the heat sink are aligned with the positioning edges 11, and then the heat sink is pushed along the radial direction of the stator core 8 so that the positioning edges 11 enter the positioning grooves 6 until the arcuate heat transfer surface 19 of the heat sink is in close contact with the inner ring wall of the stator core 8, and at the same time, the inclined surface 1 13 on the conductive plate 5 and the inclined surface 2 12 on the positioning edge 11 cooperate with each other and are in close contact.

[0042] In the above scheme, since the arc-shaped heat transfer surface 19 of the heat sink and the inner ring wall of the stator core 8 will not be scratched during the installation of the heat sink, the thermal grease will not be scraped off; at the same time, the conductive plate 5 can increase the thermal contact area between the stator core 8 and the heat sink, thereby improving the heat dissipation effect; and, since the conductive plate 5 and the positioning edge 11 are matched with the inclined surface 13 and the inclined surface 2 12, the thermal grease on the inclined surface 13 can also be prevented from being scraped off.

[0043] The stator 10 is provided with a matching cavity 9 for accommodating the heat sink. In this embodiment, specifically, a locking assembly is provided in the matching cavity 9, and the locking assembly is used to radially lock the heat sink after the heat sink enters the matching cavity 9.

[0044] More specifically, Figure 8 As shown, the locking assembly includes a locking head 14 and a locking spring 15, a mounting groove 16 is provided on the cavity wall of the matching cavity 9, one end of the locking spring 15 is fixedly connected to the groove bottom of the mounting groove 16, and the other end is fixedly connected to the locking head 14, and one end of the locking head 14 away from the locking spring 15 is provided with an inclined surface three 17 and extends out of the mounting groove 16, matching blocks 7 are provided on both sides of the heat sink, and an inclined surface four 18 matching with the inclined surface three 17 is provided on the matching block 7.

[0045] In the above scheme, after the heat sink and the stator core 8 are installed, the stator core 8 is mounted on the stator from top to bottom, and the matching block 7 on the heat sink contacts the locking head 14 on the stator 10. During the downward movement of the stator core 8, the matching block 7 squeezes the locking head 14 in the direction of the spring compression until the lower end surface of the stator core 8 contacts the installation plane on the stator 10. At this time, the spring gives the matching block 7 a radial elastic force to achieve radial positioning of the heat sink.

[0046] Among them, a centrifugal fan and an air outlet 2 are arranged on the upper part of the outer rotor 1. When the centrifugal fan rotates, the hot air flow flowing through the heat sink is blown out from the air outlet 2. The air flow flows through the heat sink at high speed for heat exchange. According to the exhaust capacity of the centrifugal fan inside the motor, the tooth thickness and spacing of the heat sink fins 4 are designed with optimized dimensions to facilitate the air flow to flow smoothly through the heat sink fins 4 and ensure sufficient heat dissipation area to maximize the heat dissipation efficiency. The motor has a corresponding matching cavity 9 to accommodate each heat sink. According to the specific motor design, it should be noted that the air flow flowing through the heat sink can be from top to bottom or from bottom to top, depending on whether the centrifugal fan of the motor or the external exhaust device is arranged above or below the heat sink flow channel. Example 2

[0047] This embodiment discloses a drone, including a drone power motor as described in Embodiment 1.

[0048] It should be noted that the remaining structural components of the drone in this embodiment belong to the prior art, and those skilled in the art can design them as needed, so they will not be described in detail in this embodiment.

[0049] 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 protection scope of the independent claims of the present invention are within the protection scope of the present invention.

Claims

1. A power motor for an unmanned aerial vehicle, comprising an outer rotor (1), a stator (10) and a stator core (8), wherein the outer rotor (1) is rotatably mounted on the stator (10); characterized in that: Also includes a number of heat sinks; The stator core (8) is sleeved on the stator (10), and the inner ring wall of the stator core (8) is provided with a mounting structure matching the number of heat sinks; The mounting structure comprises two positioning edges (11), positioning grooves (6) cooperating with the positioning edges (11) are arranged on both sides of the heat sink, one side surface of the heat sink is in close contact with the inner ring wall of the stator core (8) so as to conduct heat generated by the stator core (8) and the coil to the heat sink, and the contact surface between the heat sink and the inner ring wall of the stator core (8) is coated with thermal conductive silicone grease; The heat sink comprises a conductor (3) and a plurality of heat dissipation fins (4); a side of the conductor (3) in contact with the inner ring wall of the stator core (8) is an arc-shaped heat transfer surface (20); the plurality of heat dissipation fins (4) are arranged on a side of the conductor (3) away from the stator core (8); and the positioning grooves (6) are arranged on both sides of the conductor (3); Conductive plates (5) are provided on both sides of the conductive body (3), the conductive plates (5) and the conductive body (3) are integrally formed, and one side surface of the conductive plate (5) contacts the side end surface of the positioning edge (11) so as to conduct the heat generated by the stator core (8) and the coil to the heat sink through the positioning edge (11); The conductive plate (5) is provided with an inclined surface 1 (13) on one side, and the positioning edge (11) is provided with an inclined surface 2 (12) on one side, the inclined surface 1 (13) and the inclined surface 2 (12) are closely fitted with each other, and the inclined surface 1 (13) is coated with thermal conductive silicone grease; The stator (10) is provided with a matching cavity (9) for accommodating a heat sink; A locking assembly is arranged in the matching cavity (9), and the locking assembly is used to radially lock the heat sink after the heat sink enters the matching cavity (9); The locking assembly comprises a locking head (14) and a locking spring (15); a mounting groove (16) is arranged on the cavity wall of the matching cavity (9); one end of the locking spring (15) is fixedly connected to the groove bottom of the mounting groove (16), and the other end is fixedly connected to the locking head (14); an inclined surface three (17) is arranged at one end of the locking head (14) away from the locking spring (15) and extends out of the mounting groove (16); matching blocks (7) are arranged on both sides of the heat sink; and an inclined surface four (18) matching with the inclined surface three (17) is arranged on the matching block (7).

2. The UAV power motor according to claim 1, characterized in that: The heat dissipation fins (4) and the conductor (3) are integrally formed.

3. The UAV power motor according to claim 1, characterized in that: A centrifugal fan and an air outlet (2) are provided on the upper part of the outer rotor (1); when the centrifugal fan rotates, the airflow carrying heat that flows through the heat sink is blown out from the air outlet (2).

4. A drone, characterized in that: It comprises a UAV power motor as described in any one of claims 1-3.

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