A brushless DC motor with a fan blade structure

Abstract

This utility model relates to the field of electric motor technology and discloses a brushless DC motor with a fan-blade structure, including a rotor and a stator. A rotating shaft is fixedly connected to the shaft center of the housing. A magnet is connected to the inner side wall of the housing. Multiple cooling impellers are arranged in a circular array on one end side wall of the housing. A baffle is fixedly installed at one end of each cooling impeller. Multiple integrated positioning and heat dissipation holes are opened on one end side of the housing. One end of the rotating shaft is rotatably connected to a bracket via a bearing. Multiple heat dissipation holes are opened on the outer side of the bracket. A heat dissipation cavity is formed between the bracket and the housing. This utility model saves the height occupied by the motor by combining the housing and the cooling impellers, which is conducive to the miniaturization and thinning design of the product. The heat dissipation holes and the integrated positioning and heat dissipation holes form a convection heat dissipation channel. Cool air is drawn in from the cooling impeller end, flows through the heat-generating components inside the motor, and is discharged from the heat dissipation holes, thereby significantly improving the heat dissipation efficiency and ensuring the stable operation of the brushless DC motor.

Description

Technical Field

[0001] This utility model relates to the field of electric motor technology, specifically to a brushless DC motor with a fan blade structure. Background Technology

[0002] An external rotor brushless DC motor mainly consists of two parts: a stator and an external rotor. The stator typically includes an iron core and windings. The iron core is generally made of laminated silicon steel sheets to reduce eddy current losses, while the windings are made of insulated wires and are used to generate a magnetic field. The external rotor is the rotating part of the motor, and permanent magnets are mounted on its casing to form the rotor magnetic field.

[0003] External rotor brushless DC motors offer significant advantages in terms of high efficiency and energy saving. Due to the absence of brushes and commutator friction losses, their efficiency is typically higher than that of traditional brushed DC motors, effectively reducing energy consumption. Thanks to their performance characteristics, external rotor brushless DC motors have found widespread application in various fields. In the household appliance sector, they are commonly used in air conditioner indoor and outdoor unit fans, refrigerator cooling fans, and washing machine direct drive motors, helping to improve the performance and energy efficiency of these appliances. In the industrial sector, they can be used in various fans, pumps, and transmission devices in automated production lines, meeting the industrial demand for efficient and stable power.

[0004] Existing brushless DC motors dissipate heat by transferring heat to the casing for natural cooling, or by mounting a cooling fan on the motor shaft. However, the latter increases the motor's length. In space-constrained applications such as portable electronic devices and small home appliances, an excessively tall motor structure not only occupies internal space and affects the layout of other functional modules, but also hinders the development of miniaturized and thinner products. Therefore, developing a brushless DC motor that combines a housing with a cooling impeller is of paramount practical significance for improving the motor's heat dissipation efficiency and for achieving product miniaturization and thinning. Utility Model Content

[0005] The purpose of this utility model is to provide a DC brushless motor with a fan blade structure to solve the following technical problems: When the housing of an existing DC brushless motor dissipates heat, the heat is conducted to the housing and then dissipated naturally by the housing, or a cooling fan is installed on the motor shaft. However, the latter increases the length of the motor. In applications with limited space, such as portable electronic devices and small household appliances, the excessively tall motor structure not only occupies internal space and affects the layout of other functional modules, but also restricts the development of products towards miniaturization and thinness.

[0006] The purpose of this utility model can be achieved through the following technical solution: A brushless DC motor with a fan blade structure includes a rotor and a stator. The rotor includes a housing. A rotating shaft is fixedly connected to the center of the housing. A magnet is connected to the inner side wall of the housing. Multiple heat dissipation impellers are fixedly arranged in a ring array on one end side wall of the housing. A baffle is fixedly arranged at one end of the multiple heat dissipation impellers. The baffle is used to prevent hot air from flowing back. Multiple positioning and heat dissipation integrated holes are opened on one end side of the housing.

[0007] DC brushless motors generate a lot of heat during operation. If the heat cannot be dissipated in time, the service life of the DC brushless motor will be reduced. The combination of the housing and the heat dissipation impeller saves the height occupied by the motor, which is conducive to the miniaturization and thinning of the product design. When the motor shaft rotates, it drives the heat dissipation impeller to rotate synchronously. No other power drive or additional connection is required, and heat dissipation can be carried out in real time according to the motor's operating status.

[0008] As a further embodiment of this utility model: one end of the rotating shaft is rotatably connected to a bracket via a bearing, and the bracket is provided with a plurality of semi-circular bracket openings in a ring shape, the semi-circular bracket openings being used for installing and removing the motor;

[0009] The bracket and the shaft are rotatably connected by bearings. The bearing connection reduces the deflection of the shaft and avoids metal wear that leads to a decrease in precision. The semi-circular bracket opening allows the bolts to be tightened from the side or at an angle, avoiding the assembly limitations caused by the fully enclosed structure. The screws can be finely adjusted within the arc range of the semi-circular opening to adapt to assembly tolerances or the need for re-alignment during later maintenance.

[0010] As a further embodiment of this utility model: the rotating shaft and the stator are rotatably connected by a bearing;

[0011] The shaft and stator are connected by a bearing, which effectively reduces the friction between the shaft and stator and reduces energy loss. At the same time, during maintenance and repair, only the bearing needs to be removed to operate the stator inside the housing, which reduces maintenance costs and difficulty.

[0012] As a further embodiment of this utility model: the stator includes an iron core and a winding, the winding being wound around the iron core, and an insulating member being provided between the iron core and the salient pole of the winding.

[0013] As a further embodiment of this utility model: the outer side of the bracket is provided with multiple heat dissipation holes, and the heat dissipation holes and the integrated positioning heat dissipation holes form a convection heat dissipation channel.

[0014] The ventilation holes on the outer side of the bracket and the positioning ventilation holes on one side of the casing form a two-way airflow circulation system for convective heat dissipation. The elongated ventilation holes provide a larger opening ratio, promote air convection, effectively reduce temperature rise, and achieve efficient heat dissipation.

[0015] As a further embodiment of this utility model: a heat dissipation cavity is formed between the bracket and the housing, and the heat dissipation cavity is connected to the heat dissipation hole and the integrated positioning heat dissipation hole;

[0016] After the heat dissipation cavity is connected with the heat dissipation holes and the positioning heat dissipation, a multi-directional three-dimensional heat dissipation system is formed, which significantly improves the heat dissipation efficiency of the motor, ensures that the motor can run continuously and stably under various operating conditions, and extends the service life of the motor.

[0017] As a further embodiment of this utility model: the central axes of the rotor, stator, heat dissipation impeller and bracket are on the same straight line;

[0018] The coaxial layout allows the core components to be nested in an orderly manner along the axis, avoiding the extra space occupation caused by radial offset. The rotor, stator, heat dissipation impeller and bracket are set coaxially, which can ensure that the airflow penetrates the heat-generating area (such as the winding and iron core) along the shortest path and avoid heat dissipation blind spots caused by airflow deviation.

[0019] The beneficial effects of this utility model are:

[0020] (1) The housing and heat dissipation impeller of this utility model are combined. The rotation of the motor shaft drives the heat dissipation impeller to run synchronously. No other power drive or additional connection is required. It can dissipate heat in real time according to the operating status of the motor, effectively improving the heat dissipation efficiency. At the same time, the motor structure is simple and compact, saving the height occupied by the motor. It is suitable for scenarios that are sensitive to installation height, which is conducive to the miniaturization and thinning design of the product. The baffle at one end of the heat dissipation impeller can prevent the hot air that has flowed over the surface of the housing from flowing back, ensuring unidirectional airflow and preventing hot air from returning to the heat-generating parts of the motor and affecting the heat dissipation effect, thus ensuring the continuity and effectiveness of heat dissipation.

[0021] (2) The housing of this utility model has a positioning and heat dissipation integrated hole on one end face and a heat dissipation hole on the outer side of the bracket. The heat dissipation hole and the positioning and heat dissipation integrated hole form a convection heat dissipation channel. Cold air is drawn in from one end of the heat dissipation impeller, flows through the internal heat-generating components such as the motor core and windings, and is discharged from the heat dissipation hole, which significantly improves the heat dissipation efficiency and ensures the stable operation of the DC brushless motor. The long strip heat dissipation hole design can provide a larger opening ratio, promote air convection circulation, and quickly and efficiently reduce the temperature rise.

[0022] (3) The bracket opening of this utility model is a semi-circular structure design. The semi-circular opening serves as a channel for screw insertion, allowing bolts to be tightened from the side or at an angle. This effectively avoids the assembly restrictions caused by the fully enclosed structure. The screws can be finely adjusted within the arc range of the semi-circular opening to adapt to assembly tolerances or the need for re-alignment during later maintenance, thereby improving the flexibility of installation.

[0023] 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

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the heat dissipation impeller of this utility model;

[0027] Figure 3 This is a schematic diagram of the internal structure of the stator of the housing of this utility model;

[0028] Figure 4 This is a top view of the structure of this utility model.

[0029] In the diagram: 1. Rotor; 2. Stator; 21. Iron core; 22. Winding; 11. Housing; 111. Integrated positioning and heat dissipation hole; 12. Shaft; 13. Magnet section; 3. Heat dissipation impeller; 31. Baffle; 4. Support; 41. Semi-circular support opening; 42. Heat dissipation hole; 5. Heat dissipation cavity. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] In the field of electric motor technology, the cooling fan of a brushless DC motor mounted on its shaft increases the motor's length. In space-constrained devices, such as portable electronic devices and small household appliances, the large height of traditional motors occupies excessive space, limiting the layout of other functional modules and hindering miniaturization and thinner design. This invention addresses the problem of the excessive length of traditional brushless DC motors by employing a series of innovative designs to achieve a smaller footprint and efficient heat dissipation. The specific implementation method is as follows:

[0033] like Figure 1 , Figure 2 The brushless DC motor mainly consists of a rotor 1 and a stator 2. The rotor 1 includes a housing 11, with a rotating shaft 12 fixedly connected to the shaft center of the housing 11. A magnet part 13 is connected to the inner side wall of the housing 11. The magnet part 13 has a circular ring design and is fixedly attached to the inner wall of the housing 11 with its circular curved surface. Multiple heat dissipation impellers 3 are fixedly arranged in a ring array on one side wall of the housing 11. The heat dissipation impellers 3 are evenly and uniformly arranged on the outer side of the housing 11. The arc plate design of the heat dissipation impellers 3 reduces airflow resistance, makes the heat dissipation impellers rotate more smoothly, reduces energy consumption, and improves the overall efficiency of the heat dissipation system.

[0034] A baffle 31 is fixedly installed at one end of the heat dissipation impeller 3. The baffle 31 is perpendicular to the heat dissipation impeller 3. The baffle 31 can prevent the hot air that has flowed over the surface of the housing 11 from flowing back, ensuring unidirectional airflow and preventing hot air from returning to the heat-generating parts of the motor and affecting the heat dissipation effect. This ensures the continuity and effectiveness of heat dissipation. The heat dissipation impeller 3 is combined with the housing 11. When the motor rotates, it drives the heat dissipation impeller 3 to rotate synchronously. No other power drive or additional connection is required. It can dissipate heat in real time according to the operating status of the motor. The greater the motor load, the more heat is generated, and the speed of the heat dissipation impeller 3 will increase accordingly, effectively improving the heat dissipation efficiency. At the same time, the motor structure is simple and compact, which is conducive to saving space and reducing costs. The combination of the housing 11 and the heat dissipation impeller 3 saves the height occupied by the motor. It is suitable for scenarios where the installation height is sensitive, such as portable electronic devices and small household appliances, which is conducive to the miniaturization and thinning design of products.

[0035] Multiple integrated positioning and heat dissipation holes 111 are provided on one side of the housing 11. When the brushless DC motor is installed on other equipment or components, these integrated positioning and heat dissipation holes 111 can cooperate with the corresponding positioning structure on the mounting support or base to ensure that the motor can be accurately placed in the predetermined position during installation, ensuring the coaxiality of the motor shaft and other transmission components, as well as the perpendicularity of the motor to the mounting surface and other installation accuracy requirements. During operation, heat is generated. The presence of the integrated positioning and heat dissipation holes 111 increases the heat dissipation area on the surface of the housing 11, allowing air to come into full contact with the housing 11, promoting air convection, accelerating heat dissipation, and reducing the operating temperature of the motor.

[0036] The rotating shaft 12 and the stator 2 are rotatably connected by bearings. This connection method effectively reduces the friction between the rotating shaft 12 and the stator 2, reduces energy loss, and improves the overall efficiency of the motor. During maintenance and repair, only the bearing-related parts need to be disassembled to easily operate the stator 2, reducing maintenance costs and difficulty.

[0037] One end of the rotating shaft 12 is rotatably connected to the bracket 4 via a bearing. This connection method reduces shaft deflection and ensures that the rotor 1 maintains concentricity when rotating at high speed. The bearing isolates the rotating shaft 12 from direct contact with the bracket 4, avoiding the decrease in precision caused by metal wear. The bracket 4 has multiple semi-circular bracket openings 41 arranged in a ring. In this embodiment, there are 3 semi-circular bracket openings 41. The bracket 4 is fixed by pre-installed screws. The semi-circular openings can serve as channels for bolt insertion, allowing bolts to be tightened from the side or at an angle, avoiding the assembly limitations caused by a fully enclosed structure. The screws can be finely adjusted within the arc range of the semi-circular openings to adapt to assembly tolerances or the need for re-alignment during later maintenance. This facilitates the installation and disassembly of the motor by customers and is highly practical.

[0038] like Figure 3 The stator 2 includes an iron core 21, insulating components, and windings 22. The iron core 21 is arranged in a circular array. Multiple slots are opened on the inner side of the iron core 21 for mounting the windings 22. The windings 22 and the salient poles of the iron core 21 are separated by insulating components to prevent short circuits. The iron core 21 is used to provide a magnetic reluctance path, concentrate and guide the magnetic field generated by the windings 22 to efficiently drive the magnet part 13 of the rotor 1 to rotate, while reducing eddy current and hysteresis losses.

[0039] like Figure 4 The outer side of the bracket 4 has multiple heat dissipation holes 42. The heat dissipation holes 42 are elongated. Compared with round holes or small holes, elongated holes can provide a larger opening ratio, promote air convection, quickly remove the heat from the winding 22 and the iron core 21, dissipate heat efficiently, and reduce temperature rise.

[0040] The heat dissipation hole 42 and the positioning heat dissipation integrated hole 111 form a convective heat dissipation bidirectional airflow circulation system. Hot air is quickly discharged through the heat dissipation hole 42, and cold air is continuously replenished from the positioning heat dissipation integrated hole 111, thereby effectively avoiding the local high temperature area caused by traditional heat dissipation methods.

[0041] like Figure 1 A heat dissipation cavity 5 is formed between the bracket 4 and the housing 11. The heat dissipation cavity 5 is connected to the heat dissipation hole 42 and the integrated heat dissipation positioning hole 111, forming a multi-directional three-dimensional heat dissipation system.

[0042] The central axes of the rotor 1, stator 2, heat dissipation impeller 3 and bracket 4 are on the same straight line.

[0043] In summary, during operation, the rotor 1 and stator 2 inside the housing 11 of a brushless DC motor with a fan-blade structure generate a large amount of heat. This heat is then transferred to a cooling impeller 3 fixed to the outer wall of the housing 11 via the rotating shaft 12. Cool air enters from one end of the cooling impeller 3 and is quickly exhausted through the cooling holes 42. The cooling holes 42, together with the integrated cooling holes 111, form a convection cooling channel, accelerating heat dissipation and reducing the motor's operating temperature. The elongated cooling holes 42 provide a larger opening ratio, promoting air convection and significantly reducing temperature rise. The housing 11 and the cooling impeller 3 are combined... This design results in a simple and compact motor structure, saving on the height occupied by the motor and making it suitable for scenarios where installation height is sensitive. It also facilitates the miniaturization and thinning of the product design. At the same time, the rotation of the motor shaft 12 drives the heat dissipation impeller 3 to operate synchronously without the need for other power drives or additional connections. It can dissipate heat in real time according to the motor's operating status, effectively improving heat dissipation efficiency. When installing and disassembling the motor, the semi-circular opening structure on the bracket 4 allows the screws to be finely adjusted within the arc range of the semi-circular opening, effectively avoiding the assembly restrictions caused by a fully enclosed design and significantly improving installation flexibility.

[0044] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A brushless DC motor with a fan-blade structure, comprising a rotor (1) and a stator (2), characterized in that, The rotor (1) includes a housing (11), a rotating shaft (12) is fixedly connected to the shaft center of the housing (11), a magnet part (13) is connected to the inner side wall of the housing (11), a plurality of heat dissipation impellers (3) are fixedly arranged in a ring array on one side wall of the housing (11), a baffle (31) is fixedly arranged at one end of the plurality of heat dissipation impellers (3), the baffle (31) is used to prevent hot air from flowing back, and a plurality of positioning heat dissipation integrated holes (111) are opened on one side of the housing (11).

2. A brushless DC motor with a fan-blade structure according to claim 1, characterized in that, One end of the rotating shaft (12) is rotatably connected to a bracket (4) via a bearing. The bracket (4) has a plurality of semi-circular bracket openings (41) arranged in a ring. The semi-circular bracket openings (41) are used for installing and removing the motor.

3. A brushless DC motor with a fan-blade structure according to claim 1, characterized in that, The rotating shaft (12) and the stator (2) are rotatably connected by bearings.

4. A brushless DC motor with a fan-blade structure according to claim 1, characterized in that, The stator (2) includes an iron core (21) and a winding (22), the winding (22) being wound around the iron core (21), and an insulating member being provided between the iron core (21) and the salient pole of the winding (22).

5. A brushless DC motor with a fan-blade structure according to claim 1, characterized in that, Multiple heat dissipation holes (42) are provided on the outer side of the bracket (4), and the heat dissipation holes (42) and the integrated heat dissipation hole (111) form a convection heat dissipation channel.

6. A brushless DC motor with a fan-blade structure according to claim 2, characterized in that, A heat dissipation cavity (5) is formed between the bracket (4) and the housing (11), and the heat dissipation cavity (5) is connected to the heat dissipation hole (42) and the integrated positioning heat dissipation hole (111).

7. A brushless DC motor with a fan-blade structure according to claim 1, characterized in that, The central axes of the rotor (1), stator (2), heat dissipation impeller (3) and bracket (4) are on the same straight line.

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