Miniature direct-current brushless fan motor

Abstract

The utility model discloses a miniature direct-current brushless fan motor, which belongs to the field of accessories of nursing products and comprises a shell, the shell comprises a shell, a plurality of flow channel flow deflectors are arranged on the inner side wall of the shell at equal intervals, a boss is arranged on one side, far away from the inner side wall of the shell, of each flow channel flow deflector, and a fan mounting cavity is formed on the outer side of each boss. A fan is arranged in the fan mounting cavity; a center hole is formed in the top of the boss, the interior of the boss is of a stepped hollow structure, a first bearing mounting cavity is formed in the upper portion of the hollow structure, and a stator assembly mounting cavity is formed in the lower portion of the hollow structure; a first bearing is arranged in the first bearing installation cavity, and a stator assembly is arranged in the stator assembly installation cavity. A second bearing is arranged at the bottom of the stator assembly, a controller is arranged below the second bearing, and the rotor assembly sequentially penetrates through the second bearing, the stator assembly, the first bearing, the center hole and the fan. The miniature direct-current brushless fan motor is small in sound, small in size, light in weight and good in heat dissipation effect.

Description

Technical Field

[0001] This utility model relates to the field of nursing product accessories, and in particular to a miniature DC brushless fan motor. Background Technology

[0002] Currently, hair care products (such as curling irons, straighteners, and mini handheld fans) do not have brushless fan motors with heat dissipation. When using curling irons and straighteners, while heating the hair to shape it, it is also necessary to protect the hair from high-temperature damage and further set the hair. Moreover, there are no corresponding brushless motors with heat dissipation for blow-drying on the market. Generally, self-cooling air or small DC motors with additional fan blades are used (the disadvantages of small DC motors are: no built-in air duct; large size; and insufficient air volume). The products have low functionality and low consumer satisfaction.

[0003] Hair curlers and straighteners, being handheld hair care products, require small size, ergonomic design, and lightweight operation for extended use. Their compact structure limits the inclusion of large, heat-dissipating motors or fans, necessitating small, high-powered motors for cooling and styling. To meet the functional requirements of short styling time and high efficiency in hair curlers and straighteners, developing a miniature, heat-dissipating hair dryer motor suitable for these products has become a pressing need. Based on this, this invention proposes a miniature DC brushless fan motor. Utility Model Content

[0004] The purpose of this invention is to provide a miniature DC brushless fan motor to solve the problems mentioned above.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] This utility model discloses a miniature DC brushless fan motor, comprising a housing, the housing including an outer shell, and a plurality of flow channel guide vanes equidistantly arranged on the inner sidewall of the outer shell. A boss is provided on the side of each flow channel guide vane away from the inner sidewall of the outer shell, and a fan mounting cavity is formed on the outer side of the boss. A fan is disposed within the fan mounting cavity. A central hole is formed at the top of the boss, and the interior of the boss is a stepped hollow structure. A bearing mounting cavity is formed at the upper part of the hollow structure below the central hole, and a stator assembly mounting cavity is formed at the lower part of the hollow structure below the bearing mounting cavity. A bearing is disposed within the bearing mounting cavity, and a stator assembly is disposed within the stator assembly mounting cavity. A second bearing is disposed at the bottom of the stator assembly, and a controller is disposed below the second bearing. A rotor assembly passes sequentially through the second bearing, the stator assembly, the first bearing, the central hole, and the fan.

[0007] Furthermore, the number of flow channel guide vanes is odd.

[0008] Furthermore, the shell is a one-piece molded structure.

[0009] Furthermore, an elastic gasket is provided between the bearing and the inner wall of the central hole.

[0010] Furthermore, the fan adopts an axial fan blade shape.

[0011] Furthermore, the conductor insulation on the stator assembly adopts an integrally molded encapsulation structure, and the encapsulation is provided with a limiting step that matches the bearing.

[0012] Furthermore, the second bearing is interference-fitted with the limiting step.

[0013] Furthermore, the stator assembly's terminals include a common terminal for connecting the coils and three adjacent conductive terminals; the stators on opposite sides of the stator assembly are connected into a group by coils, with one end of each group of coils connected to the common terminal and the other end connected to its corresponding conductive terminal.

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

[0015] This utility model of a miniature DC brushless fan motor integrates the fan, motor, and airflow channel into a single unit. Furthermore, the bearing assembly has been changed from a traditional top-mounted system to a bottom-mounted system, improving the positioning and installation sequence. It eliminates the need for glue or other auxiliary fixing components in traditional installations, resulting in a smaller overall size and lighter weight. In addition, the airflow guide vanes use an odd number, reducing resonance while guiding airflow, thus reducing noise and improving heat dissipation. Moreover, the fan uses an axial fan blade shape, which conforms to the Archimedean spiral, causing the airflow generated by its rotation to flow axially, offering advantages such as high efficiency, gentle airflow, and low noise. In summary, this utility model of a miniature DC brushless fan motor is quiet, small in size, lightweight, and has excellent heat dissipation. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Figure 1 This is an exploded view of the miniature DC brushless fan motor of this utility model;

[0018] Figure 2 This is a cross-sectional view of the miniature DC brushless fan motor of this utility model;

[0019] Figure 3 This is a sectional view of the shell;

[0020] Figure 4This is a schematic diagram of the shell structure;

[0021] Figure 5 This is a schematic diagram of the stator assembly structure;

[0022] Figure 6 For stator conductor windings;

[0023] Explanation of reference numerals in the attached drawings: 1. Fan; 2. Housing; 3. Bearing 1; 4. Stator assembly; 5. Rotor assembly; 6. Bearing 2; 7. Controller; 8. Elastic washer;

[0024] 201. Housing; 202. Fan mounting cavity; 203. Boss; 204. Center hole; 205. Bearing mounting cavity; 206. Stator assembly mounting cavity; 207. Flow channel guide vane;

[0025] 401, Common terminal; 402, Conductive terminal. Detailed Implementation

[0026] like Figure 1-6 As shown, a miniature DC brushless fan motor includes a housing 2, which is a one-piece molded structure, specifically, cast using a mold. The housing 2 includes an outer shell 201, on which a plurality of flow channel guide vanes 207 are integrally formed at equal intervals. The number of flow channel guide vanes 207 is odd, i.e., 2n+1 (n=1, 2, 3, ... n, n∈positive integers). According to the resonance principle, using an odd number of vanes can reduce resonance, prevent violent vibration caused by fluid colliding with the guide vanes, and reduce flow noise.

[0027] The flow guide vane 207 has an integrally formed boss 203 on the side away from the inner wall of the outer shell 201. The outer side of the boss 203 forms a fan mounting cavity 202, and a fan 1 is installed in the fan mounting cavity 202. The fan 1 adopts an axial fan blade shape, which conforms to the Archimedean spiral. The air generated by its rotation flows axially, which has the advantages of high efficiency, smooth flow and low noise. Combined with the design of the flow guide vane 207, the resonance generated by the rotation of the fan 1 is eliminated.

[0028] The boss 203 has a central hole 204 at its top. The interior of the boss 203 is a stepped hollow structure. A bearing mounting cavity 205 is located in the upper part of the hollow structure below the central hole 204, and a stator assembly mounting cavity 206 is located in the lower part of the hollow structure below the bearing mounting cavity 205. Bearing 3 is installed inside the bearing mounting cavity 205, meaning bearing 3 is installed from the inside. This installation method eliminates the need for additional glue or other parts for fixation, making installation more convenient, and resulting in a smaller and lighter overall motor size. The design of the bearing mounting cavity 205 and the stator assembly mounting cavity 206 ensures the coaxiality of bearing 3 and stator assembly 4 after assembly.

[0029] The stator assembly 4 is installed in the stator assembly mounting cavity 206. A second bearing 6 is installed at the bottom of the stator assembly 4, and a controller 7 is installed below the second bearing 6. The conductor insulation on the stator assembly 4 is integrally molded with a rubber coating. A limiting step matching the second bearing 6 is provided on the rubber coating, and the second bearing 6 is interference-fitted with the limiting step. The integrally molded rubber coating ensures high-precision coaxiality between the limiting step and the outer circle of the stator. Furthermore, combined with the design of the first bearing mounting cavity 205 and the stator assembly mounting cavity 206, the first bearing 3, the stator assembly 4, and the second bearing 6 are guaranteed to have coaxiality after assembly, which can solve problems such as high current and vibration caused by poor coaxiality between the rotor and bearings.

[0030] The stator assembly 4 has a terminal block on its outer circle. The fixed conductive terminal is inserted to introduce current to the conductor, which generates a magnetic field. The magnetic field generated by the conductor and the magnetic field of the rotor permanent magnet attract each other and repel each other, causing the rotor to rotate and generate torque, which drives the load fan blades to rotate, thus forming a fan.

[0031] Specifically, the stator assembly 4 includes a common terminal 401 for connecting the coils and three adjacent conductive terminals 402. The stators on opposite sides of the stator assembly 4 are connected in a group by coils. One end of each group of coils is connected to the common terminal 401, and the other end is connected to its corresponding conductive terminal 402. For example... Figure 6 As shown, in this embodiment, the stator adopts a six-slot, six-tooth design, divided into three groups of coils, each group of coils being U, V, and W respectively. Each coil on the three groups of coils is designed relative to the other. When winding, one end of the coil is connected to the common terminal 401, and the other end is connected to the head of U (V, W) after passing around the relatively distributed U1, U2 (V1, V2 and W1, W2) respectively, forming a star connection.

[0032] The rotor assembly 5 passes sequentially through the second bearing 6, the stator assembly 4, the first bearing 3, the center hole 204, and the fan 1. The rotor permanent magnet of the rotor assembly 5 is made of bonded neodymium iron boron or sintered neodymium iron boron magnets, and the magnetization method is two-pole magnetization, i.e., the NSNS method. This magnetization method, combined with the star-connected winding method of the coils in the stator assembly 4, enables the rotor to rotate and generate torque to perform work according to electromagnetic principles.

[0033] The controller 7 is mounted on the stator assembly 4 and connected to the corresponding conductive terminal.

[0034] An elastic gasket 8 is installed between the bearing 3 and the inner wall of the center hole 204.

[0035] The installation process of this utility model is as follows:

[0036] First, install the elastic gasket 8 and bearing 3 in the bearing mounting cavity 205 in sequence; then, insert the long end of the rotor assembly 5 into the center hole 204 and key the long end of the rotor assembly 5 to the shaft end of the fan 1; then, insert the stator assembly 4 and bearing 6 into the middle and short ends of the rotor assembly 5 in sequence; finally, fix the controller 7 to the stator assembly 4 together, and electrically connect the controller 7 to the terminals of the stator assembly 4.

[0037] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A miniature DC brushless fan motor, characterized in that: The device includes a housing (2), which includes an outer shell (201). A plurality of flow channel guide vanes (207) are equidistantly arranged on the inner wall of the outer shell (201). A boss (203) is provided on the side of each flow channel guide vane (207) away from the inner wall of the outer shell (201). A fan mounting cavity (202) is formed on the outer side of the boss (203), and a fan (1) is installed inside the fan mounting cavity (202). A central hole (204) is provided at the top of the boss (203). The interior of the boss (203) is a stepped hollow structure, with the upper part of the hollow structure located at the central hole (204). A bearing mounting cavity (205) is provided at the lower position of the hollow structure, and a stator assembly mounting cavity (206) is provided at the lower position of the bearing mounting cavity (205); a bearing (3) is provided in the bearing mounting cavity (205), and a stator assembly (4) is provided in the stator assembly mounting cavity (206); a bearing (6) is provided at the bottom of the stator assembly (4), and a controller (7) is provided below the bearing (6); the rotor assembly (5) passes through the bearing (6), the stator assembly (4), the bearing (3), the center hole (204), and the fan (1) in sequence.

2. The miniature brushless DC fan motor according to claim 1, characterized in that: The number of the flow channel guide vanes (207) is odd.

3. The miniature brushless DC fan motor according to claim 1, characterized in that: The shell (2) is a one-piece molded structure.

4. The miniature brushless DC fan motor according to claim 1, characterized in that: An elastic gasket (8) is provided between the bearing (3) and the inner wall of the center hole (204).

5. The miniature brushless DC fan motor according to claim 1, characterized in that: The fan (1) adopts an axial flow fan blade shape.

6. The miniature brushless DC fan motor according to claim 1, characterized in that: The conductor insulation on the stator assembly (4) adopts an integrally molded rubber coating, and the rubber coating is provided with a limiting step that matches the bearing (6).

7. The miniature brushless DC fan motor according to claim 6, characterized in that: The bearing 2 (6) is interference-fitted with the limiting step.

8. The miniature brushless DC fan motor according to claim 1, characterized in that: The stator assembly (4) has terminals including a common terminal (401) for connecting coils and three adjacent conductive terminals (402); the stators on opposite sides of the stator assembly (4) are connected into a group by coils, one end of each group of coils is connected to the common terminal (401), and the other end is connected to its corresponding conductive terminal (402).

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