Motor and unmanned aerial vehicle

Abstract

The utility model relates to a motor and an unmanned aerial vehicle. The motor and a clamp can be fastened in the state that a fastening hole used for being fastened with a fastening object is restrained or avoided from being damaged. The motor includes: a stator portion having a stator; and a rotor portion having a rotor rotatable about a rotational axis with respect to the stator, the stator portion having a base portion in which a first fastening hole for fastening the motor and an object to be fastened is formed, and a second fastening hole different from the first fastening hole is further formed in the base portion. And the second fastening hole is used for fastening the motor and the clamp.

Description

Technical Field

[0001] The utility model relates to a motor and an unmanned aerial vehicle. Background Art

[0002] A motor is known, comprising a stator and a rotor, for providing a rotational driving force in a fastened object (e.g., a drone). The stator portion has a bracket base, the bracket base is formed with an internal threaded hole for the fastened object, and the motor is connected to the arm of the drone by passing an external threaded screw through a hole provided in the arm of the drone and screwing the external threaded screw into the internal threaded hole for the fastened object.

[0003] Before connecting the motor to the arm of the drone, the motor is operated with the bracket base mounted on the fixture while performing a reliability test (e.g., testing the rotation speed, torque, etc.) in a state where the assembled motor is in operation. At this time, it is considered to use the internal threaded hole for the fastening object formed in the bracket base to fasten the motor to the fixture, but in this case, the hole used when fixing the motor to the fastening object will be used, which may cause damage to the internal threaded hole for the fastening object. On the other hand, it is considered to fix the outer edge of the bracket base, but (especially for thin motors) it is difficult to fix because the gap between the bracket base and the rotor is narrow. Utility Model Content

[0004] The utility model is completed in view of the above-mentioned problems, and an object of the utility model is to provide a motor and a drone, which can fasten the motor and the clamp in a state where damage to the fastening hole used for fastening to the fastening object is suppressed or avoided.

[0005] In order to achieve the above-mentioned purpose, the first aspect of the utility model provides a motor, comprising: a stator part having a stator; and a rotor part having a rotor that can rotate around a rotation axis relative to the stator, the stator part having a base part, the base part forming a first fastening hole for fastening the motor to a fastening object, the base part also forming a second fastening hole different from the first fastening hole, the second fastening hole being used to fasten the motor to a clamp.

[0006] According to the motor of the utility model, by distinguishing between a first fastening hole for fastening the motor to a fastening object and a second fastening hole for fastening the motor to a clamp, the motor can be fastened to the clamp while suppressing or avoiding damage to the fastening holes for fastening to the fastening object, thereby extending the service life of the motor and reducing the number of parts replacements.

[0007] Furthermore, in the motor of the present invention, the base portion may be formed with at least two of the second fastening holes. According to the above structure, the motor can be firmly fixed to the clamp.

[0008] In the motor of the present invention, the inner diameter of the second fastening hole may be different from the inner diameter of the first fastening hole. According to the above structure, it is possible to prevent a screw threadedly fastened to one of the first fastening hole and the second fastening hole from being erroneously fastened to the other thread.

[0009] In addition, in the motor of the present invention, the inner diameter of the second fastening hole may be larger than the inner diameter of the first fastening hole. According to the above structure, for example, a clamp fastening member matched with the second fastening hole will not enter the first fastening hole, and the first fastening hole can be easily prevented from being misused.

[0010] In addition, in the motor of the present invention, the inner diameter of the second fastening hole may be smaller than the inner diameter of the first fastening hole. According to the above structure, even if the clamp fastening member matched with the second fastening hole enters the first fastening hole, the first fastening hole will not be damaged (for example, when the inner circumferential surface of the first fastening hole is provided with an internal thread, the internal thread of the first fastening hole will not be damaged), and the first fastening hole used for fastening with the fastening object can be prevented from being damaged.

[0011] In addition, in the motor of the utility model, the edge of the first fastening hole may be provided with a protrusion extending from the base portion to the opposite side of the rotor in the axial direction along the rotation axis, and the edge of the second fastening hole may not be provided with a protrusion extending outward. According to the above structure, the first fastening hole and the second fastening hole can be easily distinguished.

[0012] In addition, in the motor of the present invention, the rotor may be an outer rotor covering the stator from the radially outer side, the base portion may be located at a position closer to the axial side along the rotation axis than the rotor portion, that is, at one axial side, the base portion and the rotor portion are axially opposite, the surface of the base portion facing the other axial side is formed to be flat, and the distance between the other axial side end of the base portion and the one axial side end of the rotor portion in the axial direction is 3 mm or less. According to the above structure, even in a motor in which it is difficult to hold the outer edge of the base portion, the motor can be reliably mounted on the fixture.

[0013] In addition, in the motor of the utility model, the first fastening hole may be an internal threaded hole, and the motor may be fastened to the fastening object by threaded fastening at the first fastening hole, and the second fastening hole may be an internal threaded hole, and the motor may be fastened to the clamp by threaded fastening at the second fastening hole. According to the above structure, the motor and the clamp can be fastened in a state where damage to the internal threaded hole used for fastening to the fastening object is suppressed or avoided.

[0014] A second aspect of the present invention provides an unmanned aerial vehicle, comprising: any one of the above-mentioned motors; and a fastening member fastening the motor to a main body of the unmanned aerial vehicle via the first fastening hole, wherein the second fastening hole is exposed to the outside.

[0015] According to the drone of the utility model, by distinguishing between the first fastening hole for fastening the motor to the main body of the drone and the second fastening hole for fastening the motor to the clamp, it is possible to prevent damage to the fastening holes for fastening to the main body of the drone, extend the service life of the motor, and reduce the number of component replacements.

[0016] Furthermore, in the drone of the present invention, the first fastening hole may be an internal thread hole, and the fastening member may be an external thread screw. According to the above structure, it is possible to suppress or prevent damage to the internal thread hole used for fastening to the main body of the drone. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a cross-sectional view schematically showing a motor according to an embodiment of the present invention.

[0018] Figure 2 It is a bottom view schematically showing a base portion of a motor according to an embodiment of the present invention as viewed from one axial side.

[0019] Figure 3 This is a cross-sectional view schematically showing a motor according to an embodiment of the present invention, and illustrates a state in which the motor is mounted on a fastening object.

[0020] Figure 4 It is a cross-sectional view schematically showing a motor according to an embodiment of the present invention, and shows a state in which the motor is mounted on a jig.

[0021] (Explanation of symbols)

[0022] 10 Stator

[0023] 11 Stator

[0024] 14 Base

[0025] 20 rotor part

[0026] 21 rotor

[0027] 70 protrusion

[0028] 100 motors

[0029] 200 Fastening objects

[0030] 300 fixture

[0031] H1 first fastening hole

[0032] H2 second fastening hole

[0033] L Rotation axis DETAILED DESCRIPTION

[0034] Hereinafter, the technical scheme of the embodiment and the modified example of the utility model will be described with reference to the accompanying drawings. In addition, the scope of the utility model is not limited to the following embodiment and the modified example, and can be arbitrarily changed within the scope of the technical idea of ​​the utility model. In addition, in the following drawings, in order to facilitate the understanding of each structure, the actual structure is sometimes different from the scale, quantity, etc. in each structure.

[0035] In the following description, the direction parallel to the axial direction of the rotation axis L of the rotor rotating around the rotation axis L is referred to as the “axial direction”, the radial direction centered on the rotation axis L is referred to as the “radial direction”, and the circumferential direction centered on the rotation axis L is referred to as the “circumferential direction”.

[0036] <First embodiment>

[0037] Figure 1 It is a cross-sectional view schematically showing the motor 100 according to the present embodiment. Figure 2 It is a schematic bottom view of the base portion 14 of the motor 100 according to the present embodiment as viewed from one axial side. Figure 3 1 is a cross-sectional view schematically showing the motor 100 according to the present embodiment, and shows a state in which the motor 100 is attached to a fastening object 200 . Figure 4 1 is a cross-sectional view schematically showing the motor 100 according to the present embodiment, and shows a state in which the motor 100 is attached to the jig 300 .

[0038] The motor 100 of this embodiment includes a stator portion 10 and a rotor portion 20, and is used to provide a rotational driving force in a fastened object (e.g., a drone). As an example, a drone includes a main body, and a gimbal is installed on the main body. The gimbal includes, for example, one or more (e.g., two) arms connected in sequence in a relatively rotatable manner. The arm located on the base side (close to the drone body side) can also be rotatably connected to the drone body. A camera is rotatably installed at the front end of the arm located on the front end side (away from the drone body side). The motor of this embodiment can be used, for example, as a motor to swing the above-mentioned arm or camera (driven component). In addition, the motor of this embodiment can also be used, for example, as a motor to rotate the propeller (driven component) of a drone.

[0039] The motor 100 includes a stator unit 10 having a stator 11 and a rotor unit 20 having a rotor 21 rotatable relative to the stator 11 about a rotation axis L. In the present embodiment, the rotor 21 is an outer rotor covering the stator 11 from the radially outer side.

[0040] The motor 100 further includes a shaft 30. The rotor portion 20 includes a rotor holder 22. The rotor 21 is fixed to the shaft 30 via the rotor holder 22. The rotor holder 22 is oriented toward one side in the axial direction along the rotation axis L, that is, toward the axial side ( Figure 1 In the middle, it is a cylindrical shape with a bottom that is open on the lower side of the paper.

[0041] The rotor holder 22 includes a peripheral wall portion 24 and an upper wall portion 23. The peripheral wall portion 24 is substantially cylindrical and extends in the axial direction, and holds the rotor 21 on the inner circumference. Although not shown in detail, the rotor 21 has, for example, a cylindrical rotor core extending in the axial direction, and a plurality of magnets fixed to the inner circumference of the rotor core in a circumferentially arranged manner. However, the present invention is not limited thereto, and the rotor 21 may also adopt other known structures. The peripheral wall portion 24 covers the stator 11 from the radially outer side. The upper wall portion 23 extends from the other axial side ( Figure 1 The upper wall portion 23 covers the stator 11 from the other axial side. The peripheral wall portion 24 and the upper wall portion 23 can be formed integrally. For example, the driven component 80 ( Figure 3 ) is fixed to the upper wall portion 23. For example, when the rotor 21 rotates around the rotation axis L, the upper wall portion 23 of the rotor holder 22 is driven to rotate, and the driven component 80 rotates together with the upper wall portion 23. The rotor holder 22 is fixed to the outer peripheral surface of the shaft 30 at the center portion, and can be fixed in a known manner. In addition, instead of the structure in which the peripheral wall portion 24 holds the rotor 21 on the inner peripheral surface, the rotor can also be fixedly connected to the axial end of the peripheral wall portion 24. In addition, the driven component can also be fixed to the shaft 30 and rotate around the rotation axis L together with the shaft 30.

[0042] The stator 11 includes, for example, a stator core 111 having a core back and a plurality of teeth extending radially outward from the core back and arranged in the circumferential direction; an insulator (not shown); and a coil 112 wound around the stator core 111 via the insulator. When the motor 100 is driven, the stator 11 generates a magnetic field between the stator 11 and the rotor magnet by energizing the stator 11, and the rotor 21 rotates around the rotation axis L by the interaction between the magnetic field and the magnetism of the rotor magnet. However, the present invention is not limited thereto, and the stator 11 may also adopt other known structures.

[0043] The stator 10 further includes a bracket 12. The bracket 12 includes a cylinder 13 and a base 14. That is, the stator 10 includes a base 14. The cylinder 13 is substantially cylindrical and extends in the axial direction, and surrounds the shaft 30 from the radially outer side. The stator core 111 is fixed to the outer peripheral surface of the cylinder 13.

[0044] The motor 100 further includes bearings 41, 42 and a C-shaped ring 43. The cylindrical portion 13 rotatably supports the shaft 30 via the bearings 41, 42. The C-shaped ring 43 restricts the shaft 30 from moving in the axial direction relative to the cylindrical portion 13 (stator portion 10).

[0045] The base portion 14 extends radially outward from the cylinder portion 13. The base portion 14 is located on the axial side ( Figure 1 The base portion 14 is located at a position closer to the axial side than the rotor 21. The base portion 14 is axially opposite to the rotor portion 20. The outer peripheral portion of the base portion 14 is axially opposite to the rotor 21. The surface of the base portion 14 facing the other axial side is formed to be flat. The distance L1 between the other axial side end of the base portion 14 in the axial direction and the one axial side end of the rotor portion 20 is less than 3 mm. In this way, even in a motor in which it is difficult to hold the outer edge portion (radial outer edge portion) of the base portion 14, the motor can be reliably mounted on the fixture.

[0046] like Figure 1 to Figure 3 As shown, the base portion 14 is formed with a first fastening hole H1 for fastening the motor 100 to the fastening object 200. The base portion 14 is formed with one or more (three in this embodiment) first fastening holes H1. For example, a plurality of first fastening holes H1 are arranged in a circumferential direction. The first fastening hole H1 is recessed from the surface of the base portion 14 facing one axial side to the other axial side. In addition, the first fastening hole H1 may penetrate the base portion 14 in the axial direction.

[0047] The main body 200a of the fastening object 200 is located at a position closer to the axial side than the motor 100. The fastening object 200 has a fastening member 51 that fastens the motor 100 to the fastening object 200 via a first fastening hole H1. For example, the motor 100 is fastened to the main body 200a of the fastening object 200 by threaded fastening at the first fastening hole H1. The first fastening hole H1 may be an internal threaded hole having a threaded inner circumferential surface. In one example, the fastening object 200 is a drone, and the fastening member fastens the motor 100 to the main body of the drone via the first fastening hole H1. In this embodiment, the fastening member 51 is an externally threaded screw. The motor 100 is mounted on the fastening object 200 by threading the externally threaded screw 51 through a hole portion H3 provided on the main body 200a of the fastening object 200 with the first fastening hole H1. The hole portion H3 is a through hole that penetrates the main body 200a in the axial direction.

[0048] The edge of the first fastening hole H1 is provided with a protrusion 70 extending from the base portion 14 to the side opposite to the rotor 21 in the axial direction. In the present embodiment, the edge of the first fastening hole H1 is provided with a protrusion 70 extending from the side (the axial side) opposite to the rotor 21 in the axial direction of the base portion 14 facing the axial side. The protrusion 70 can be formed over the entire circumference. For example, a recess having a shape matching the protrusion 70 can be provided in the fastening object 200 (the main body 200a) for accommodating the protrusion 70. This facilitates installation and can prevent or suppress relative rotation between the bracket 12 (stator portion 10) and the fastening object 200 (the main body 200a). In addition, it is also possible that a recess having a shape matching the protrusion 70 is not provided in the fastening object 200. When the base portion 14 of the stator portion 10 is fastened to the fastening object 200, when the edge portion of the first fastening hole H1 is provided with the protrusion 70 and the fastening object 200 is not provided with a recess having a shape matching the protrusion 70, the second fastening hole H2 described below is separated from the fastening object 200 (the main body 200a) by a gap in the axial direction ( Figure 3 ).

[0049] The base portion 14 is also formed with a second fastening hole H2 which is different from the first fastening hole H1. The second fastening hole H2 is used to fasten the motor 100 to the clamp 300 ( Figure 4 ). By distinguishing between the first fastening hole H1 for fastening the motor 100 to the fastening object 200 and the second fastening hole H2 for fastening the motor 100 to the clamp 300, the motor 100 can be fastened to the clamp 300 while suppressing or avoiding damage to the first fastening hole H1 for fastening to the fastening object 200, thereby extending the service life of the motor 100 and reducing the number of component replacements. In the present embodiment, the base portion 14 is formed with at least two (for example, three) second fastening holes H2. Thus, the motor 100 can be firmly fixed to the clamp 300. For example, a plurality of second fastening holes H2 are arranged in a circumferential direction. The positional relationship between the second fastening hole H2 and the first fastening hole H1 in the circumferential direction is not particularly limited. For example, the second fastening hole H2 and the first fastening hole H1 can be alternately arranged in the circumferential direction. The radial position of the second fastening hole H2 can be the same as or different from that of the first fastening hole H1. The number of the second fastening holes H2 may be the same as that of the first fastening holes H1 so that the reliability test can be performed more appropriately. In addition, the number of the second fastening holes H2 may also be different from that of the first fastening holes H1.

[0050] The second fastening hole H2 is recessed from the surface of the base portion 14 facing one axial side to the other axial side. In addition, the second fastening hole H2 may penetrate the base portion 14 in the axial direction. The motor 100 may be fastened to the clamp 300 by threaded fastening at the second fastening hole H2. The second fastening hole H2 may be an internal threaded hole having a threaded inner circumference. The clamp 300 is located at a position closer to the axial side than the motor 100. The clamp 300 may have a clamp fastening member 52 for fastening the motor 100 to the clamp 300 via the second fastening hole H2. For example, the clamp fastening member 52 is an externally threaded screw. The motor 100 is fastened to the clamp 300 by passing the externally threaded screw 52 through the hole portion H4 (the hole portion H4 is a through hole penetrating the clamp 300 in the axial direction) provided in the clamp 300 and screwing it into the second fastening hole H2. However, it is not limited thereto, and the second fastening hole H2 may also not have a threaded inner circumference. For example, the clamp 300 may be fastened to the motor 100 via the second fastening hole H2 by press-fitting, fitting, etc. Before the motor 100 is mounted on, for example, the arm of the drone body, the motor 100 is operated with the base 14 mounted on the clamp 300 while performing a reliability test (e.g., testing the rotation speed, torque, etc.) in a state where the assembled motor 100 is operated.

[0051] The inner diameter D2 of the second fastening hole H2 may be different from the inner diameter D1 of the first fastening hole H1 . This can prevent, for example, a screw threadedly fastened to one of the first fastening hole H1 and the second fastening hole H2 from being mistakenly threadedly fastened to the other.

[0052] In a preferred example, the inner diameter D2 of the second fastening hole H2 is larger than the inner diameter D1 of the first fastening hole H1. Thus, for example, the clamp fastening member 52 engaged with the second fastening hole H2 does not enter the first fastening hole H1, and misuse of the first fastening hole H1 can be easily prevented.

[0053] In another preferred example, the inner diameter D2 of the second fastening hole H2 is smaller than the inner diameter D1 of the first fastening hole H1 ( Figure 2 Thus, even if the clamp fastening member 52 that matches the second fastening hole H2 enters the first fastening hole H1, the first fastening hole H1 will not be damaged, and damage to the first fastening hole H1 for fastening to the fastening object 200 can be prevented.

[0054] In this embodiment, the edge of the second fastening hole H2 is not provided with a protrusion extending outward (for example, one side in the axial direction). When the base portion 14 of the stator portion 10 is fastened to the clamp 300, when the edge of the first fastening hole H1 is provided with a protrusion 70, the second fastening hole H2 is fastened to the clamp 300 with a gap in the axial direction via the clamp fastening member 52 ( Figure 4), the protrusion 70 of the edge of the first fastening hole H1 can abut against the clamp 300 in the axial direction. The opening of the first fastening hole H1 toward one side in the axial direction can be covered by the clamp 300.

[0055] In addition, the motor 100 further includes a circuit substrate 60 for supplying power to the coil, etc. The circuit substrate 60 extends in the radial direction. The circuit substrate 60 is accommodated in a space surrounded by the rotor holder 22 and the base portion 14, for example. The circuit substrate 60 is arranged between the stator 11 and the base portion 14 in the axial direction. The circuit substrate 60 may be located radially inward of the rotor 21. Thus, the internal space of the motor 100 can be fully utilized and the motor can be prevented from being enlarged in the axial direction.

[0056] The present embodiment also provides a drone, comprising: the motor 100; and a fastening member 51 for fastening the motor 100 to the drone body via the first fastening hole H1. When the motor 100 is mounted on the drone, the second fastening hole H2 is exposed to the outside (the second fastening hole H2 is not used as a hole for fastening the motor 100 to the drone body).

[0057] <Other Modifications>

[0058] In the above embodiment, the rotor 21 is an outer rotor that covers the stator 11 from the radially outer side. However, the present invention is not limited to this, and the rotor 21 may be an inner rotor type in which the stator faces the rotor from the radially outer side.

[0059] In the above-mentioned embodiments, a motor applied to a drone is cited, but the present invention is not limited thereto, and the motor disclosed herein may also be applied to other equipment, devices, and the like.

[0060] The above specific embodiments of the utility model are described in detail in conjunction with the accompanying drawings. However, it can be understood that the above description does not limit the utility model in any form, and the technical features in each embodiment can be combined with each other in any way to form a new embodiment. In addition, after understanding the above specific embodiments, those skilled in the art can make various other modifications and changes to the utility model as needed. These do not deviate from the essential content of the utility model.

Claims

1. A motor comprising: a stator portion having a stator; and a rotor portion having a rotor rotatable about a rotation axis relative to the stator, It is characterized in that The stator portion has a base portion, and the base portion is formed with a first fastening hole for fastening the motor to a fastening object. The base portion is further formed with a second fastening hole different from the first fastening hole, and the second fastening hole is used to fasten the motor to the clamp.

2. The motor according to claim 1, characterized in that The base portion is formed with at least two second fastening holes.

3. The motor according to claim 1, characterized in that An inner diameter of the second fastening hole is different from an inner diameter of the first fastening hole.

4. The motor according to claim 3, characterized in that An inner diameter of the second fastening hole is larger than an inner diameter of the first fastening hole.

5. The motor according to claim 3, characterized in that An inner diameter of the second fastening hole is smaller than an inner diameter of the first fastening hole.

6. The motor according to claim 1, characterized in that The edge of the first fastening hole is provided with a protrusion extending from the base portion to the opposite side of the rotor in the axial direction along the rotation axis, and the edge of the second fastening hole is not provided with a protrusion extending outward.

7. The motor according to claim 1, characterized in that The rotor is an outer rotor covering the stator from the radial outer side, The base portion is located on one side of the axial direction along the rotation axis than the rotor portion, that is, on one axial side, and the base portion and the rotor portion are opposite to each other in the axial direction. The surface of the base portion facing the other axial side is formed to be flat. A distance between the other axial side end of the base portion and the one axial side end of the rotor portion in the axial direction is 3 mm or less.

8. The motor according to claim 1, characterized in that The first fastening hole is an internal threaded hole, and the motor is fastened to the fastening object by thread fastening at the first fastening hole. The second fastening hole is an internal threaded hole, and the motor is fastened to the clamp at the second fastening hole by threaded fastening.

9. A drone, characterized in that: have: The motor according to any one of claims 1 to 8; and a fastening member for fastening the motor to the main body of the drone via the first fastening hole, The second fastening hole is exposed to the outside.

10. The drone according to claim 9, characterized in that: The first fastening hole is an internal thread hole, and the fastening member is an external thread screw.

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