Brushless outward-rotating motor with small-hole casing

Abstract

The brushless external rotation motor comprises a rotatable circular integrated shell and a rotating shaft which is coaxially connected with the integrated shell in a penetrating mode, a plurality of heat dissipation holes are formed in the face, connected with the rotating shaft, of the integrated shell, and the heat dissipation holes are arranged in an annular array mode with the rotating shaft as a circle. The top of the integrated shell is provided with a plurality of heat dissipation holes which are annularly arrayed, the heat dissipation holes are in an oval shape with two straight side edges and two semicircular ends, the width of the heat dissipation holes is consistent with the diameter of the rotating shaft, and the number of the heat dissipation holes is four. The top of the integrated shell is provided with a plurality of heat dissipation holes which are annularly arrayed, and the heat dissipation holes are in an oval shape with two straight long sides; compared with an existing fan-shaped heat dissipation hole, the fan-shaped heat dissipation hole is smaller in width and opening, large foreign matter is not prone to entering the motor to damage the interior of the motor while the heat dissipation performance is guaranteed, and the safety of the fan-shaped heat dissipation hole applied to an unmanned aerial vehicle scene is improved.

Description

Technical Field

[0001] The utility model relates to the field of brushless motors, in particular to a brushless outboard motor with a small hole casing. Background Art

[0002] With the rapid development of science and technology, the requirements for automation accuracy, speed and life are rapidly increasing. The application field of brushless motors is also developing rapidly. Brushless outrunner motors are composed of permanent magnets, windings and controllers. Inside the motor, the windings will generate a magnetic field inside the motor after being energized. Under the action of the permanent magnets, a rotational torque is generated in the motor, thereby driving the motor to rotate. The controller controls the power output of the DC power supply and the on-off of the windings by detecting the motor rotor profile signal and torque information to achieve forward and reverse rotation of the motor. Unlike traditional motors, the rotor of a brushless motor does not require traditional brushes to control power supply and commutation. Instead, the controller uses autonomous commutation and current control to avoid the mechanical wear and spark effects of traditional brushless motors.

[0003] The propeller blades of drones will stir up dust and obstacles when flying or landing. Due to the strong magnetic attraction of brushless motors and the large heat dissipation holes of the casing, Figure 1 As shown, the heat dissipation holes opened in the existing motor housing are fan-shaped and have a relatively large opening width, so foreign matter may enter the interior of the brushless motor, causing damage to the internal components of the brushless motor, and even causing the brushless motor to be unable to rotate normally. Utility Model Content

[0004] In order to overcome the deficiencies of the above-mentioned prior art, the utility model provides a brushless outboard motor with a small hole casing to solve the problem in the background technology that the heat dissipation holes opened in the existing motor casing are fan-shaped and have a large opening, which may cause foreign matter to enter the interior of the brushless motor, causing damage to the internal components of the brushless motor, and even causing the brushless motor to fail to rotate normally.

[0005] In order to solve the above technical problems, the utility model provides the following technical solutions: a small-hole housing brushless outboard motor, comprising a rotatable circular one-piece shell, and a rotating shaft coaxially connected to the one-piece shell, a plurality of heat dissipation holes are opened on one side of the one-piece shell connected to the rotating shaft, and the heat dissipation holes are arranged in a ring array with the rotating shaft as a circle. The heat dissipation holes are elliptical with two sides being straight lines and two ends being semicircular, and the width is consistent with the diameter of the rotating shaft, and four of the heat dissipation holes are provided.

[0006] Preferably, the rotating shaft is located inside the one-piece shell and is rotatably connected to a base, the base is sleeved and fixed with a stator core, the stator core is provided with a plurality of coils in a ring array, and the one-piece shell is provided with a plurality of permanent magnets.

[0007] Preferably, the base is in a vertical cylindrical shape, and an upper bearing and a lower bearing are respectively embedded in the top and bottom ends of the base, and the lower end of the rotating shaft is connected to the upper bearing and the lower bearing.

[0008] Preferably, the plurality of permanent magnets are fixed on the inner annular surface of the integral shell in an annular array.

[0009] Preferably, four mounting plates are fixed to the bottom end of the outside of the base, the four mounting plates are arranged in a circular array outside the base and are integrally formed with the base, and among the four mounting plates, a rectangular bayonet is commonly provided between two adjacent mounting plates.

[0010] Preferably, several of the mounting plates are provided with mounting holes.

[0011] Compared with the prior art, the beneficial effects that the utility model can achieve are: the outward-type brushless motor of the utility model is provided with a plurality of heat dissipation holes in a ring array on the top of the integrated shell, and the heat dissipation holes are in the shape of an ellipse with two long sides as straight sides, and the width is consistent with the diameter of the rotating shaft. Compared with the existing fan-shaped heat dissipation holes, the width is smaller and the opening is smaller. While ensuring the heat dissipation performance, it is not easy for large foreign objects to enter and cause damage to the inside of the motor, thereby improving the safety of application in drone scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the prior art;

[0013] Figure 2 It is a three-dimensional diagram of the utility model;

[0014] Figure 3 It is a side sectional view of the utility model;

[0015] Figure 4 This is a top view of the base of the utility model;

[0016] Among them: 1. integrated shell; 2. heat dissipation holes; 3. stator core; 4. coil; 5. base; 6. lower bearing; 7. upper bearing; 8. permanent magnet; 9. mounting plate; 10. mounting holes; 11. bayonet; 12. rotating shaft. DETAILED DESCRIPTION

[0017] In order to more clearly illustrate the overall concept of the present invention, a detailed description is given below in the form of examples in conjunction with the accompanying drawings.

[0018] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0019] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] In the present utility model, unless otherwise clearly specified and limited, the first feature "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description of reference terms "one scheme", "some schemes", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the scheme or example are included in at least one scheme or example of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same scheme or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more schemes or examples.

[0022] Embodiment:

[0023] like Figure 1-4As shown, the utility model provides a brushless outboard motor with a small hole casing, comprising a rotatable circular integral casing 1, and a rotating shaft 12 coaxially connected to the integral casing 1, a plurality of heat dissipation holes 2 are provided on one side of the integral casing 1 connected to the rotating shaft 12, and the plurality of heat dissipation holes 2 are arranged in a ring array with the rotating shaft 12 as a circle, the heat dissipation holes 2 are in an elliptical shape with two sides being straight lines and two ends being semicircular, and the width is consistent with the diameter of the rotating shaft 12, and four heat dissipation holes 2 are provided.

[0024] In this embodiment, specifically, the rotating shaft 12 is located inside the integrated shell 1 and is rotatably connected to a base 5, the base 5 is sleeved and fixed with a stator core 3, the stator core 3 is provided with a plurality of coils 4 in a ring array, and a plurality of permanent magnets 8 are provided inside the integrated shell 1;

[0025] Among them, the coil 4 is a winding, which is electrically connected to the power supply of the external drone to generate a rotating magnetic field, and interacts with the magnetic field generated by the permanent magnet, thereby generating a torque to drive the rotating shaft 12 and the integrated shell 1 to rotate.

[0026] In this embodiment, specifically, the base 5 is in a vertical cylindrical shape, and an upper bearing 7 and a lower bearing 6 are respectively embedded in the top and bottom ends thereof, and the lower end of the rotating shaft 12 is connected to the upper bearing 7 and the lower bearing 6 .

[0027] In this embodiment, specifically, a plurality of the permanent magnets 8 are fixed on the inner annular surface of the integral shell 1 in an annular array.

[0028] In this embodiment, specifically, four mounting plates 9 are fixed to the bottom end of the outside of the base 5, and the four mounting plates 9 are arranged in a circular array outside the base 5 and are integrally formed with the base 5, and a rectangular bayonet 11 is commonly opened between two adjacent mounting plates 9 in the four mounting plates 9;

[0029] Among them, the rectangle can be used to enable the mounting plate 9 to be engaged with the circuit board or other components of the drone for limiting the position, and the mounting hole 10 can be used to fix the mounting plate 9 to the circuit board or other components of the drone. The two mounting plates with the common bayonet 11 among the four mounting plates 9 are formed in one piece.

[0030] In this embodiment, specifically, several of the mounting plates 9 are provided with mounting holes 10 .

[0031] Working principle: When several coils 4 are connected to power, a rotating magnetic field will be generated, which interacts with the magnetic fields generated by several permanent magnets to generate torque, driving the rotating shaft 12 and the integrated shell 1 to rotate, thereby driving the blades of the application drone to rotate. The rotating shaft 12 rotates stably under the support of the upper bearing 7 and the lower bearing 6 inside the base 5; the elliptical heat dissipation holes 2 with straight sides and semicircular ends on the integrated shell 1 have a smaller width while ensuring heat dissipation compared to the wider fan-shaped holes in the prior art. During the rotation of the integrated shell 1, larger foreign objects can be prevented from entering the heat dissipation holes 2 to cause damage to internal components, and during the rotation, the narrower heat dissipation holes 2 can reduce the possibility of foreign objects entering.

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A brushless outboard motor with a small hole housing, comprising a rotatable circular integral housing (1), and a rotating shaft (12) coaxially connected to the integral housing (1), characterized in that: A plurality of heat dissipation holes (2) are provided on one side of the integral shell (1) connected to the rotating shaft (12); the plurality of heat dissipation holes (2) are arranged in a circular array with the rotating shaft (12) as a circle; the heat dissipation holes (2) are in the shape of an ellipse with two straight sides and two semicircular ends, and the width is consistent with the diameter of the rotating shaft (12); and four heat dissipation holes (2) are provided.

2. The brushless outrunner motor with small hole housing according to claim 1, characterized in that: The rotating shaft (12) is located inside the integrated shell (1) and is rotatably connected to a base (5); a stator core (3) is sleeved and fixed on the base (5); the stator core (3) is provided with a plurality of coils (4) in a ring array; and a plurality of permanent magnets (8) are provided inside the integrated shell (1).

3. The brushless outrunner motor with small hole housing according to claim 2, characterized in that: The base (5) is in the shape of a vertical cylinder, and an upper bearing (7) and a lower bearing (6) are respectively embedded at the top and bottom ends thereof, and the lower end of the rotating shaft (12) is connected to the upper bearing (7) and the lower bearing (6).

4. The brushless outrunner motor with small hole housing according to claim 3, characterized in that: A plurality of permanent magnets (8) are fixed on the inner annular surface of the integral shell (1) in an annular array.

5. The small hole housing brushless outboard motor according to claim 4, characterized in that: Four mounting plates (9) are fixed to the bottom end of the outside of the base (5); the four mounting plates (9) are arranged in a circular array outside the base (5) and are integrally formed with the base (5); and a rectangular bayonet (11) is commonly provided between two adjacent mounting plates (9) among the four mounting plates (9).

6. The brushless outrunner motor with small hole housing according to claim 5, characterized in that: Several of the mounting plates (9) are provided with mounting holes (10).

Images