Outer rotor brushless motor with heat dissipation hole structure

Abstract

The utility model discloses an outer rotor brushless motor with a heat dissipation hole structure, which relates to the field of motor design and comprises a stator and a rotor, and a copper wire winding is fixedly mounted on the stator. The rotor comprises a rotating cover and a rotating shaft, a permanent magnet ring is fixedly mounted on an inner ring of the rotating cover, a through hole is formed in the middle of the stator, and the rotating shaft is fixedly mounted in the center of circle of the end face of the rotating cover and rotationally matched in the through hole; a plurality of air inlets are formed in the end face of the rotating cover, an outer convex edge is formed on the edge of one side of each air inlet, and a fan blade structure is formed among the outer convex edges of the air inlets; compared with the prior art, when the rotating cover of the rotor rotates at a high speed, the outer convex edge of the end face of the rotating cover can form a fan blade structure, so that external air is flapped to enter the rotating cover from the air inlet, air circulation in the rotating cover is formed, heat of the stator and the rotor can be quickly taken away, the brushless motor can work stably, and the service life of the brushless motor is prolonged. And overheating damage is not easy to occur.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and in particular to an external rotor brushless motor with a heat dissipation hole structure. Background Technology

[0002] A brushless motor is a DC motor without brushes and a commutator. It uses an electronic control system to change the direction of the current, thereby driving the motor to rotate. Compared to brushed motors, brushless motors typically have higher efficiency, longer lifespan, and require less maintenance.

[0003] High-speed brushless motors generate a lot of heat during long-term operation. To address this, a DC brushless motor is disclosed in the prior art (Announcement No.: CN214256059U, Announcement Date: 2021.09.21). This motor integrates the brushless motor driver into the motor body and connects to the motor via the wiring terminals between the PCB driver board and the motor. Combined with the contact connection between the heat sink and the MOSFET, this reduces the number of wires and improves heat dissipation efficiency.

[0004] The above solution involves transferring heat to several fins on the heat sink for cooling, which is a passive cooling method with poor heat dissipation. Since the internal structure of the brushless motor lacks a flow-guiding and ventilation structure, the motor is still prone to overheating during long-term operation, leading to motor damage.

[0005] In the existing technology, some brushless motors have fan blades installed on their shafts. By driving the fan blades to rotate at high speed, airflow is allowed to flow through the internal structure of the brushless motor to remove heat. However, the fan blades not only increase the weight of the motor but also reduce its stability. Therefore, it is necessary to design an external rotor brushless motor with a heat dissipation hole structure to solve these technical problems. Utility Model Content

[0006] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0007] An external rotor brushless motor with a heat dissipation hole structure includes a stator and a rotor. A copper wire winding is fixedly installed on the stator. The rotor includes a rotating cover and a rotating shaft. A permanent magnet ring is fixedly installed on the inner ring of the rotating cover. The copper wire winding is installed in the permanent magnet ring with a clearance fit. A through hole is provided in the middle of the stator. The rotating shaft is fixedly installed at the center position of the end face of the rotating cover and is rotatably fitted in the through hole. Several air inlets are formed on the end face of the rotating cover. The air inlets are arranged in a circular array. An outward convex edge is formed on one side edge of the air inlets. The outward convex edges of the air inlets form a fan blade structure. When the rotating cover rotates, air is fed into the air inlets through the outward convex edges.

[0008] Furthermore: when the copper wire windings of the stator are energized, they work in conjunction with the magnetic field of the permanent magnet ring to drive the rotating cover and the rotating shaft to rotate.

[0009] Furthermore: the stator includes a positioning cylinder and a base plate. The base plate has an annular structure and is sleeved and installed on the positioning cylinder. The copper wire winding is sleeved and fixedly installed on the positioning cylinder.

[0010] Furthermore: the through hole is provided through the positioning cylinder, and the inner sides of both ends of the through hole are formed with bearing mounting grooves. Rolling bearings are installed in the bearing mounting grooves with clearance fit, and the rotating shaft is inserted and installed at the inner ring of the two rolling bearings.

[0011] Furthermore: a limiting groove is formed on the rotating shaft, and a retaining spring is installed in the limiting groove, which abuts against the inner ring of the rolling bearing.

[0012] Furthermore: one end of the positioning cylinder is formed with a limiting block, and the bottom plate is installed against the limiting block.

[0013] Furthermore: the limiting block has a first threaded hole formed on it, and the base plate has a second threaded hole formed on it. The base plate is locked onto the limiting block by means of screws passing through the first screw hole and the second screw hole.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. When the rotating cover of the rotor rotates at high speed, the outer convex edge of the end face of the rotating cover can form a fan blade structure, which in turn blows the outside air into the rotating cover from the air inlet, forming air circulation inside the rotating cover. This can quickly remove the heat from the stator and rotor, enhance the heat dissipation effect of the brushless motor, and thus ensure the stable operation of the brushless motor and prevent it from overheating and being damaged.

[0016] 2. No additional fan blades are needed for heat dissipation, resulting in low design costs, and the size and weight of the brushless motor are not increased.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0021] Figure 3 This is an exploded structural diagram of the present invention;

[0022] Figure 4 This is an exploded structural diagram from another perspective of this utility model.

[0023] The figure shows: 1. Stator; 1.1. Positioning cylinder; 1.2. Base plate; 2. Rotor; 2.1. Rotating cover; 2.2. Rotating shaft; 2.3. Permanent magnet ring; 3. Copper wire winding; 4. Through hole; 5. Air inlet; 6. Outer protrusion; 7. Bearing mounting groove; 8. Rolling bearing; 9. Limiting groove; 10. Snap ring; 11. Limiting block; 12. First threaded hole; 13. Second threaded hole. Detailed Implementation

[0024] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0025] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0026] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1-4 As shown, the brushless motor with a heat dissipation hole structure of the present invention includes a stator 1 and a rotor 2. A copper wire winding 3 is fixedly installed on the stator 1. The rotor 2 includes a rotating cover 2.1 and a rotating shaft 2.2. A permanent magnet ring 2.3 is fixedly installed on the inner ring of the rotating cover 2.1. The copper wire winding 3 is fitted inside the permanent magnet ring 2.3 with a clearance fit. A through hole 4 is provided in the middle of the stator 1. The rotating shaft 2.2 is fixedly installed at the center position of the end face of the rotating cover 2.1. The rotating shaft 2.2 rotates and fits... The stator 1 is installed in the through hole 4; when the copper wire winding 3 of the stator 1 is energized, it drives the rotating cover 2.1 and the rotating shaft 2.2 to rotate in conjunction with the magnetic field of the permanent magnet ring 2.3; a number of air inlets 5 are formed on the end face of the rotating cover 2.1, and the number of air inlets 5 are arranged in a circular array with each other. An outer protruding edge 6 is formed on one side edge of the air inlet 5, and the outer protruding edges 6 of the number of air inlets 5 form a fan blade structure. When the rotating cover 2.1 rotates, the air is fed into the air inlet 5 through the outer protruding edge 6.

[0030] The principle is as follows: When the rotating cover 2.1 of the rotor rotates at high speed, the outer protruding edge 6 of the end face of the rotating cover 2.1 can form a fan blade structure, thereby fanning the outside air into the rotating cover 2.1 from the air inlet 5, forming air circulation inside the rotating cover 2.1, which can quickly remove the heat of the stator 1 and rotor 2, enhance the heat dissipation effect of the brushless motor, and thus ensure the stable operation of the brushless motor, making it less prone to overheating and damage. In addition, there is no need to drive the fan blades for heat dissipation, resulting in low design cost, and the size and weight of the brushless motor will not increase.

[0031] Furthermore, the stator 1 includes a positioning cylinder 1.1 and a base plate 1.2. The base plate 1.2 has an annular structure and is sleeved and installed on the positioning cylinder 1.1. The copper wire winding 3 is sleeved and fixedly installed on the positioning cylinder 1.1. This ensures the stable installation of the base plate 1.2 and the copper wire winding 3, thereby ensuring the stability of the brushless motor during operation.

[0032] Furthermore: the through hole 4 penetrates the positioning cylinder 1.1, and the inner sides of both ends of the through hole 4 are formed with bearing mounting grooves 7. Rolling bearings 8 are installed in the bearing mounting grooves 7 with clearance fit. The rotating shaft 2.2 is inserted and installed at the inner ring of the two rolling bearings 8. This allows the rotating shaft 2.2 to rotate stably in the through hole 4, ensuring the concentricity of the rotating shaft 2.2 during rotation, making it less prone to vibration, and ensuring the stability of the brushless motor during operation.

[0033] Furthermore, a limiting groove 9 is formed on the rotating shaft 2.2, and a retaining spring 10 is installed in the limiting groove 9. The retaining spring 10 abuts against the inner ring of the rolling bearing 8. The retaining spring 10 can be used to lock the limiting groove 9 to limit the installation position of the rolling bearing 8 on the rotating shaft 2.2, thereby ensuring the precise positioning of the rotating shaft 2.2.

[0034] Furthermore: one end of the positioning cylinder 1.1 is formed with a limiting block 11, and the base plate 1.2 is installed against the limiting block 11; this ensures the stable installation of the base plate 1.2.

[0035] Furthermore: the limiting block 11 has a first threaded hole 12 formed on it, and the base plate 1.2 has a second threaded hole 13 formed on it. The base plate 1.2 is locked onto the limiting block 11 by screws passing through the first screw hole and the second screw hole. The base plate 1.2 can be locked by screws, thereby ensuring the stable installation of the base plate 1.2.

[0036] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. An external rotor brushless motor with a heat dissipation hole structure, comprising a stator and a rotor, wherein a copper wire winding is fixedly mounted on the stator; characterized in that: The rotor includes a rotating cover and a rotating shaft. A permanent magnet ring is fixedly installed on the inner ring of the rotating cover. Copper wire windings are installed in the permanent magnet ring with a gap fit. A through hole is provided in the middle of the stator. The rotating shaft is fixedly installed at the center position of the end face of the rotating cover and is rotatably installed in the through hole. The rotating cover has several air inlets formed on its end face. The air inlets are arranged in a circular array. An outward protrusion is formed on one side edge of the air inlet. The outward protrusions of the air inlets form a fan blade structure. When the rotating cover rotates, air is fed into the air inlets through the outward protrusions.

2. The external rotor brushless motor with heat dissipation hole structure according to claim 1, characterized in that: When the copper wire windings of the stator are energized, they work in conjunction with the magnetic field of the permanent magnet ring to drive the rotating cover and the shaft to rotate.

3. The external rotor brushless motor with heat dissipation hole structure according to any one of claims 1 or 2, characterized in that: The stator includes a positioning cylinder and a base plate. The base plate has an annular structure and is sleeved and installed on the positioning cylinder. The copper wire winding is sleeved and fixedly installed on the positioning cylinder.

4. The external rotor brushless motor with heat dissipation hole structure according to claim 3, characterized in that: The through hole is provided through the positioning cylinder, and the inner sides of both ends of the through hole are formed with bearing mounting grooves. Rolling bearings are installed in the bearing mounting grooves with clearance fit, and the rotating shaft is inserted and installed at the inner ring of the two rolling bearings.

5. The external rotor brushless motor with heat dissipation hole structure according to claim 4, characterized in that: The rotating shaft has a limiting groove formed on it, and a retaining spring is installed in the limiting groove to engage with it. The retaining spring is positioned to abut against the inner ring of the rolling bearing.

6. The external rotor brushless motor with heat dissipation hole structure according to any one of claims 4 or 5, characterized in that: One end of the positioning cylinder is formed with a limiting block, and the bottom plate is installed against the limiting block.

7. The external rotor brushless motor with heat dissipation hole structure according to claim 6, characterized in that: The limiting block has a first threaded hole, and the base plate has a second threaded hole. The base plate is locked to the limiting block by screws passing through the first and second screw holes.

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