Axial magnetic field based planar centrifugal fan

Abstract

The utility model relates to a kind of plane centrifugal fan based on axial magnetic field, including wind wheel and support;Wind wheel is installed on the central shaft of support, and stator assembly is installed on the upper end surface of support, and rotor assembly is installed on the lower end surface of wind wheel, and rotor assembly and stator assembly are axially opposite distribution;Stator assembly includes several electromagnetic coils, electromagnetic coil is distributed along the upper end surface of support periphery, and rotor assembly includes several permanent magnets, permanent magnet is distributed along the lower end surface of wind wheel periphery, when electromagnetic coil is energized, axial magnetic field is generated and drives wind wheel with permanent magnet rotation;The utility model realizes the ultra-thin of centrifugal fan, high efficiency and low noise operation, and is suitable for modern electronic equipment with strict requirements on space and performance.

Description

Technical Field

[0001] This utility model belongs to the field of centrifugal fan technology, and particularly relates to a planar centrifugal fan based on an axial magnetic field. Background Technology

[0002] As modern electronic devices increasingly demand higher space utilization, traditional centrifugal fans, due to their structural limitations, struggle to meet the design requirements of ultra-thinness, low noise, and high efficiency. Traditional centrifugal fans typically employ a radial magnetic field design, with the stator and rotor arranged radially, resulting in a relatively large overall thickness and hindering the achievement of thinner and lighter designs.

[0003] Furthermore, traditional centrifugal fans tend to generate significant noise during high-speed operation, and their energy conversion efficiency is also limited by the magnetic field structure. Therefore, there is an urgent need for a new centrifugal fan structure that is more compact, quieter, and more efficient to meet the diverse needs of modern products in terms of space, performance, and user experience. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a planar centrifugal fan based on an axial magnetic field, so as to achieve efficient and low-noise operation of the fan in an ultra-thin structure.

[0005] The purpose of this utility model is achieved through the following technical solution: This planar centrifugal fan based on an axial magnetic field includes a rotor and a support; the rotor is mounted on the central shaft of the support, a stator assembly is mounted on the upper surface of the support, and a rotor assembly is mounted on the lower surface of the rotor, with the rotor assembly and the stator assembly axially opposite each other; the stator assembly includes several electromagnetic coils distributed circumferentially along the upper surface of the support, and the rotor assembly includes several permanent magnets distributed circumferentially along the lower surface of the rotor; when the electromagnetic coils are energized, an axial magnetic field is generated, driving the rotor with the permanent magnets to rotate.

[0006] The beneficial effects of this utility model are as follows: Compared with the prior art, the axial magnetic field design, with the stator and rotor arranged along the axial direction, significantly reduces the thickness of the fan and meets the space requirements of ultra-thin equipment; the optimized magnetic field distribution and impeller structure reduce operating noise and improve user experience; the compact structure makes it easy to integrate into various thin and light equipment, and has good versatility and scalability; it realizes the ultra-thin, high-efficiency and low-noise operation of centrifugal fans, and is suitable for modern electronic equipment with strict requirements for space and performance.

[0007] Preferably, an annular plastic plate is fixed to the upper surface of the bracket, and a plurality of fixing brackets for fixing the electromagnetic coil are provided on the annular plastic plate. The fixing brackets are distributed along the circumference of the annular plastic plate, and the fixing brackets, the annular plastic plate and the bracket are integrally injection molded. With the above structure, the space can be effectively utilized by setting it into an annular plastic plate, and the fixing brackets, the annular plastic plate and the bracket are integrally injection molded, the structure is more stable, the molding is more convenient, and the noise can be effectively controlled during the high-speed operation of the fan.

[0008] Preferably, the inner side of the fixing frame is hollow, and the outer peripheral wall of the fixing frame is grooved; this facilitates the installation of the electromagnet and the winding of the enameled wire.

[0009] Preferably, the electromagnetic coil includes an electromagnet and an enameled wire. The electromagnet is embedded in the fixed frame and protrudes from the fixed frame. The enameled wire is wound and fixed to the groove-shaped outer peripheral wall of the fixed frame by a winding method, and the enameled wire is connected to the circuit board. Through the above structure, namely the embedded electromagnet and the winding of the enameled wire, the structure of the electromagnetic coil in the height direction is more compact, thereby greatly reducing the overall thickness of the fan.

[0010] Preferably, the circuit board is fixed at the center of the bracket; this not only makes the spatial layout more rational, but also facilitates the connection between the enameled wire in the electromagnetic coil and the circuit board.

[0011] Preferably, a plurality of embedding slots are provided on the lower end surface of the wind turbine, the embedding slots are distributed along the circumference of the wind turbine, and the permanent magnet is embedded in the embedding slots and protrudes from the embedding slots; by embedding and fixing the permanent magnet, the structure of the rotor assembly in the height direction of the wind turbine is more compact, thereby greatly reducing the overall thickness of the wind turbine.

[0012] Preferably, the axial clearance between the rotor assembly and the stator assembly is 0.5 mm to 2 mm; such a clearance height ensures a balance between magnetic field strength and driving efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the exploded structure of the planar centrifugal fan of this utility model.

[0014] Figure 2 This is a schematic diagram of the wind turbine structure of this utility model.

[0015] Figure 3 yes Figure 1 A magnified structural diagram at point A.

[0016] The labels in the attached diagram are as follows: 1. Wind turbine; 2. Support frame; 3. Stator assembly; 4. Rotor assembly; 5. Annular plastic plate; 6. Circuit board; 11. Embedded slot; 31. Electromagnet; 32. Enameled wire; 41. Permanent magnet; 51. Fixing frame. Detailed Implementation

[0017] The present invention will now be described in detail with reference to the accompanying drawings: as shown in the drawings Figures 1 to 3 As shown, this utility model includes a wind turbine 1 and a support 2. The wind turbine 1 is mounted on the central shaft of the support 2. A stator assembly 3 is mounted on the upper surface of the support 2, and a rotor assembly 4 is mounted on the lower surface of the wind turbine 1, with the rotor assembly 4 and stator assembly 3 axially opposite each other. The stator assembly 3 includes several electromagnetic coils distributed circumferentially along the upper surface of the support 2. The rotor assembly 4 includes several permanent magnets 41 distributed circumferentially along the lower surface of the wind turbine 1. When the electromagnetic coils are energized, an axial magnetic field is generated, driving the wind turbine 1 with the permanent magnets 41 to rotate. An axial air gap is provided between the stator assembly 3 and the rotor assembly 4, and the rotor rotation is driven by changes in the axial magnetic field. The wind turbine generates airflow, and the support 2 provides stability for the entire structure.

[0018] The stator assembly 3 adopts a planar winding structure with coils arranged axially and the magnetic field direction is axial; the permanent magnets 41 in the rotor assembly 4 are arranged axially and interact with the stator magnetic field to generate rotational torque.

[0019] This planar centrifugal fan based on an axial magnetic field is suitable for refrigerators with limited space and high requirements for noise and efficiency, enabling the fan to operate efficiently and with low noise in an ultra-thin structure.

[0020] The wind turbine 1 is made of lightweight, high-strength materials, such as carbon fiber or engineering plastics, and is formed by injection molding or 3D printing. Bracket 2 is made of aluminum alloy, providing good heat dissipation performance and structural strength; A ring-shaped plastic plate 5 is fixed on the upper surface of the bracket 2. Several fixing frames 51 for fixing electromagnetic coils are provided on the ring-shaped plastic plate 5. The fixing frames 51 are distributed around the circumference of the ring-shaped plastic plate 5, and the fixing frames 51 and the ring-shaped plastic plate 5 are integrally injection molded with the bracket 2.

[0021] The inner side of the fixing frame 51 is hollow, and the outer peripheral wall of the fixing frame 51 is grooved.

[0022] The electromagnetic coil includes an electromagnet 31 and an enameled wire 32. The electromagnet 31 is embedded in the fixing frame 51 and protrudes from the fixing frame 51. The enameled wire 32 is wound and fixed on the groove-shaped outer peripheral wall of the fixing frame 51 by a winding method, and the enameled wire 32 is connected to the circuit board 6.

[0023] The circuit board 6 is fixed at the center of the bracket 2.

[0024] Several embedding slots 11 are formed on the lower end face of the wind turbine 1. The embedding slots 11 are distributed along the circumference of the wind turbine 1. The permanent magnet 41 is embedded in the embedding slots 11 and protrudes from the embedding slots 11. The permanent magnet 41 is made of high-performance rare earth permanent magnet material, such as neodymium iron boron, and is arranged along the axial polarity.

[0025] The axial clearance between rotor assembly 4 and stator assembly 3 is 0.5 mm to 2 mm.

[0026] The working principle of this invention is as follows: When the electromagnetic coil in the stator assembly 3 is energized, it generates an axial magnetic field, which interacts with the permanent magnet 41 in the rotor assembly 4 to form an axial magnetic pull, driving the rotor and impeller 1 to rotate. Due to the axial magnetic field design, the stator and rotor are arranged axially, effectively reducing the overall thickness of the fan. At the same time, the planar winding structure reduces copper and iron losses, improves motor efficiency, and reduces operating noise.

[0027] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A planar centrifugal fan based on an axial magnetic field, comprising a fan wheel (1) and a support (2); the fan wheel (1) is mounted on the central shaft of the support (2), characterized in that: A stator assembly (3) is installed on the upper end face of the support (2), and a rotor assembly (4) is installed on the lower end face of the wind turbine (1). The rotor assembly (4) and the stator assembly (3) are axially opposite to each other. The stator assembly (3) includes several electromagnetic coils, which are circumferentially distributed along the upper end face of the support (2). The rotor assembly (4) includes several permanent magnets (41), which are circumferentially distributed along the lower end face of the wind turbine (1). When the electromagnetic coil is energized, it generates an axial magnetic field and drives the wind turbine (1) with the permanent magnets (41) to rotate.

2. The planar centrifugal fan based on an axial magnetic field according to claim 1, characterized in that: A ring-shaped plastic plate (5) is fixed on the upper surface of the bracket (2). The ring-shaped plastic plate (5) is provided with a number of fixing brackets (51) for fixing the electromagnetic coil. The fixing brackets (51) are distributed along the circumference of the ring-shaped plastic plate (5), and the fixing brackets (51) and the ring-shaped plastic plate (5) are integrally injection molded with the bracket (2).

3. The planar centrifugal fan based on an axial magnetic field according to claim 2, characterized in that: The inner side of the fixing frame (51) is hollow, and the outer peripheral wall of the fixing frame (51) is grooved.

4. The planar centrifugal fan based on an axial magnetic field according to claim 3, characterized in that: The electromagnetic coil includes an electromagnet (31) and an enameled wire (32). The electromagnet (31) is embedded in the fixing frame (51) and protrudes from the fixing frame (51). The enameled wire (32) is wound and fixed on the groove-shaped outer peripheral wall of the fixing frame (51) by a winding method, and the enameled wire (32) is connected to the circuit board (6).

5. The planar centrifugal fan based on an axial magnetic field according to claim 4, characterized in that: The circuit board (6) is fixed at the center of the bracket (2).

6. The planar centrifugal fan based on an axial magnetic field according to claim 1, characterized in that: The wind turbine (1) has several embedded grooves (11) on its lower end surface. The embedded grooves (11) are distributed along the circumference of the wind turbine (1). The permanent magnet (41) is embedded in the embedded grooves (11) and protrudes from the embedded grooves (11).

7. The planar centrifugal fan based on an axial magnetic field according to claim 1, characterized in that: The axial clearance between the rotor assembly (4) and the stator assembly (3) is 0.5 mm to 2 mm.

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