Structure of micro fan without driving circuit

Abstract

The utility model discloses a kind of driveless circuit micro fan structure, it includes shell, rotor assembly, no iron core stator coil and metal contact, no iron core stator coil is set in the bottom surface position in shell, metal contact is located on the surface of shell, the connecting line between metal contact and no iron core stator coil driveless circuit.The utility model structure design is reasonable, using driveless circuit design structure, drive circuit is external, it does not occupy fan internal space, can utilize the space saved to promote fan base thickness, enhance structural strength and can be added to blade, effectively promote fan PQ performance and improve noise performance, improve the flexibility of wiring simultaneously.In addition, using metal contact structure design, for contact type connection, can be directly contacted with system probe, without welding or plugging can complete connection, fan installation connection is convenient, easy to standardize micro fan product, to realize mass production, with higher social benefit.

Description

Technical Field

[0001] This utility model relates to the field of micro fan technology, specifically to a micro fan structure without a drive circuit. Background Technology

[0002] In the micro fan industry, a micro fan architecture with a drive circuit is commonly used. For example, the earlier patent application, publication number "CN119945020A," entitled "Micro Disc Motor and Micro Fan Thereof," discloses a micro disc motor and its micro fan. The micro disc motor includes a PCB stator assembly and a drive control circuit. The PCB stator assembly includes a PCB board and stator coils mounted on the PCB board. The stator coils are connected to the drive control circuit, which includes a drive chip and a DC voltage supply unit, a filter input interface circuit, a voltage divider adjustment circuit, a DIR mode selection circuit, a MOD mode selection circuit, an FG output circuit, and a PWM speed control circuit, all connected to the drive chip. While this micro fan meets the usage requirements, it has the following problems and requires further optimization:

[0003] 1. Difficult to implement waterproof protection: It is difficult to implement waterproof protection at the conventional trace exit points of a PCB board;

[0004] 2. It is not conducive to improving fluid performance: because the thickness of the driver IC in the circuit occupies the internal space of the base, it is difficult to effectively improve fluid performance;

[0005] 3. Significant magnetic field interference: Because the IC in the circuit is close to the motor's magnetic field, it is subject to significant interference from the motor's magnetic field, which can easily cause signal interference and have a significant impact on product noise.

[0006] 4. Not conducive to thin and light design: The thickness of the IC limits the thickness of the base. Due to the presence of the IC, the base needs to be reduced in thickness to avoid interference, which results in insufficient base strength. In order to ensure strength, the base needs to be thickened. Therefore, having a driver IC is not conducive to thin and light design. Utility Model Content

[0007] To address the aforementioned shortcomings, the purpose of this utility model is to provide a micro fan structure without a drive circuit that has a reasonable structural design and is conducive to lightweight and thin design.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] A micro fan structure without a drive circuit includes a housing, a rotor assembly, a coreless stator coil, and metal contacts. The coreless stator coil is located on the bottom surface inside the housing. The metal contacts are located on the surface of the housing and connected to the coreless stator coil. The connection line between the metal contacts and the coreless stator coil has no drive circuit. The rotor assembly is rotatably mounted inside the housing corresponding to the position of the coreless stator coil.

[0010] As a preferred embodiment of the present invention, the outer shell includes an outer frame assembly and a top cover, the top cover being fastened to the outer frame assembly, which has a simple structure and is easy to disassemble and assemble.

[0011] As a preferred embodiment of this utility model, a driveless element FPC is provided on the bottom surface of the outer frame assembly, the coreless stator coil is welded on the driveless element FPC, and a lead frame is embedded in the outer frame assembly. One end of the lead frame is connected to the driveless element FPC, and the other end is connected to the metal contact, thereby realizing the electrical connection between the coreless stator coil and the metal contact.

[0012] As a preferred embodiment of this utility model, a sealant is provided between the outer frame assembly and the top cover, and the gap between the two is filled by the sealant.

[0013] In a preferred embodiment of this invention, the metal contacts are located on the bottom or side surface of the outer frame assembly. The installation position of the metal contacts can be flexibly selected according to actual design and usage requirements, facilitating connection with external drive circuits.

[0014] In a preferred embodiment of this utility model, the housing includes an LDS base, a side frame, and a top cover. The side frame is disposed on the LDS base, and the top cover covers the side frame. The LDS base is provided with LDS circuitry, one end of which has a solder pad, and the other end is connected to the metal contacts. The coreless stator coil is soldered to the solder pad. The LDS base is made of LDS plastic, and conductive lines are formed on its surface using the LDS process to replace FPC, saving the thickness space occupied by FPC.

[0015] In a preferred embodiment of this invention, the LDS base is provided with positioning posts for positioning the coreless stator coil. The positioning posts are used to position the coreless stator coil, thereby improving its stability.

[0016] As a preferred embodiment of this utility model, a sealant is provided between the LDS base and the side frame, and the sealant fills the gap between the two to enhance the overall sealing of the shell.

[0017] As a preferred embodiment of this utility model, the metal contact is located on the bottom surface of the LDS base, which facilitates the connection and arrangement with the external drive circuit.

[0018] The beneficial effects of this utility model are as follows: The utility model has a reasonable structural design, employing a driverless circuit design. By externalizing the driver circuit, it does not occupy internal fan space, allowing for increased fan base thickness, enhanced structural strength, and the addition of components to the blades, effectively improving fan performance (PQ) and noise reduction. Simultaneously, traditional driver circuits with ICs and other electronic components occupy wiring space, limiting remaining wiring options. With the driver circuit externalized, almost the entire space below the coil can be used for wiring, significantly increasing wiring flexibility. Furthermore, the presence of ICs and other electronic components necessitates a hole in the bottom of the fan base to avoid them, which could lead to waterproofing failure. To prevent this, adhesive sealing is required between the components and the base, significantly increasing manufacturing costs. Additionally, the metal contact structure design allows for direct contact with system probes, eliminating the need for soldering or plugging. This facilitates fan installation and connection, promotes standardization of micro-fan products, and enables mass production, resulting in significant social benefits. Compared to the traditional fan wiring harness assembly method, the male and female terminal plug-in assembly method is more efficient and can reduce the number of plugging and unplugging steps at the system end, thus reducing costs.

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of this utility model. Figure 1 .

[0021] Figure 2 This is a three-dimensional structural diagram of Embodiment 1 of this utility model. Figure 2

[0022] Figure 3 This is an exploded structural diagram of Embodiment 1 of this utility model.

[0023] Figure 4 This is a schematic diagram of the outer frame assembly in Embodiment 1 of this utility model.

[0024] Figure 5 This is a three-dimensional structural schematic diagram of Embodiment 2 of this utility model.

[0025] Figure 6 This is an exploded structural diagram of Embodiment 2 of this utility model.

[0026] Figure 7 This is a schematic diagram of the outer frame assembly in Embodiment 2 of this utility model.

[0027] Figure 8 This is a three-dimensional structural diagram of Embodiment 3 of this utility model. Figure 1 .

[0028] Figure 9 This is a three-dimensional structural diagram of Embodiment 3 of this utility model. Figure 2

[0029] Figure 10 This is an exploded structural diagram of Embodiment 3 of this utility model. Detailed Implementation

[0030] Example 1, see Figures 1 to 4 This embodiment provides a micro fan structure without a drive circuit, which includes a housing 1, a rotor assembly 2, a coreless stator coil 3, and metal contacts 4.

[0031] See Figure 3 The outer casing 1 includes an outer frame assembly 11 and a top cover 12. The top cover 12 is fastened to the outer frame assembly 11, forming a relatively closed cavity for accommodating components such as the rotor assembly 2 and the coreless stator coil 3, providing basic structural support and protection for the fan. This casing structure facilitates disassembly and assembly, which is beneficial for component installation and maintenance during the manufacturing process, and also facilitates cleaning or repair of the fan's interior. Preferably, a sealant 13 is provided between the outer frame assembly 11 and the top cover 12 to fill the gap between them, thereby enhancing the sealing performance of the outer casing 1 and improving structural stability. The outer frame assembly 11 includes a base with a frame edge and a central tube in the middle. The rotor assembly 2 includes blades, a motor housing, a shaft, and a magnet. The blades are fitted onto the motor housing, one end of the shaft is fixed to the center of the motor housing, and the magnet is disposed inside the motor housing. The coreless stator coil 3 is disposed on the bottom surface of the base, specifically distributed around the central tube. The shaft is mounted on the central tube via a bearing, allowing the rotor assembly 2 to rotate within the base corresponding to the position of the coreless stator coil 3.

[0032] The outer bottom surface of the base is provided with a back iron empty slot corresponding to the position of the middle tube, and a back iron 6 is provided in the back iron empty slot.

[0033] The metal contact 4 is located on the surface of the housing 1 and is connected to the coreless stator coil 3. In this embodiment, the metal contact 4 is located on the bottom surface of the base. During installation, it can directly contact the system probe without soldering or plugging, making connection convenient. In other embodiments, the installation position of the metal contact 4 can be flexibly selected according to actual design and usage requirements, such as on the side.

[0034] The connection between the metal contact 4 and the coreless stator coil 3 is without a driving circuit. Specifically, a non-driving element FPC7 is provided on the bottom surface of the base, and the coreless stator coil 3 is soldered onto the non-driving element FPC7. A lead frame 8 is embedded in the base, with one end of the lead frame 8 connected to the non-driving element FPC7 and the other end connected to the metal contact 4, thus realizing the electrical connection between the coreless stator coil 3 and the metal contact 4. The combination of the non-driving element FPC7 and the lead frame 8 allows for a more flexible arrangement of the connection lines between the coreless stator coil 3 and the metal contact 4, improving the reliability and stability of the connection, and also helps to further optimize the utilization of the internal space of the housing 1.

[0035] Example 2, see Figure 5-7 The micro fan structure without drive circuit provided in this embodiment is basically the same as that in embodiment 1. The difference is that the metal contact 4 is located on the side of the outer frame assembly 11.

[0036] Example 3, see Figure 8-10 This embodiment provides a micro fan structure without a drive circuit, which is basically the same as the structure of Embodiment 1. The difference is that it does not have a driveless component FPC7. Instead, the housing 1 includes an LDS base 14, a side frame 15, and a top cover 16. The side frame 15 is disposed on the LDS base 14. Preferably, a sealant is provided between the LDS base 14 and the side frame 15 to fill the gap between them and enhance the overall sealing of the housing. The top cover 16 covers the side frame 15.

[0037] The LDS base 14 is equipped with LDS circuitry. The LDS base 14 is made of LDS plastic, and conductive lines are formed on its surface using the LDS process to replace the FPC. The thickness space occupied by the original FPC can be added to the fan blades, effectively improving fluid and noise performance. One end of the LDS circuitry has a solder pad 141, and the other end is connected to the metal contact 4. The metal contact 4 is preferably located on the bottom surface of the LDS base 14 for easy connection and arrangement with external drive circuitry.

[0038] The coreless stator coil 3 is soldered onto the solder pad 141. Preferably, the LDS base 14 is provided with a positioning post 142 for positioning the coreless stator coil 3. The positioning post 142 is precisely matched with the inner ring shape of the coreless stator coil 3, and is used to position the coreless stator coil 3, ensuring accurate positioning of the coreless stator coil 3 during installation and soldering, improving the precision and efficiency of production assembly, and also helping to improve the stability of the coreless stator coil 3, preventing displacement or loosening during use, thereby ensuring the normal operation and performance stability of the fan.

[0039] In summary, the micro fan structure without a drive circuit of this invention has the following advantages:

[0040] 1. Solving the bottleneck of fluid performance: Traditional fans have built-in drive circuits. Due to the presence of ICs and other electronic components in the drive circuit, the thickness of the base cannot be further reduced, otherwise it will affect the strength. After changing to an external drive circuit, the strength of the base is greatly improved. Therefore, the thickness of the base can be reduced. The height space saved by reducing the base thickness can be added to the blades, which can effectively improve the fan's PQ performance and significantly improve noise performance.

[0041] 2. Solving the bottleneck of limited space and difficult wiring: When the driver circuit is built in, the IC and electronic components of the driver circuit will occupy the space for wiring, resulting in limited remaining space for wiring. After the driver circuit is external, the space under the coil can be used for wiring almost entirely, greatly increasing the flexibility of wiring.

[0042] 3. Overcoming the bottleneck of dust and water protection: When the drive circuit is built-in, the presence of ICs and electronic components in the drive circuit necessitates a hole in the bottom of the base to avoid these components. This hole leads to waterproofing failure. To prevent waterproofing failure, adhesive sealing is required between the components and the base, which significantly increases manufacturing costs. Furthermore, traditional fans use a wiring harness assembly method, i.e., a plug-and-play assembly of male and female terminals, resulting in low efficiency. This invention adopts a contact-type metal contact 4 structure, which provides a contact connection, resulting in high assembly efficiency and facilitating dust and water protection design.

[0043] 4. Solved the problem of assembly and connection in narrow planar space: This utility model adopts a contact-type metal contact 4 structure. The metal contact 4 is located on the bottom or side of the base and can directly contact the system probe. The connection can be completed without welding or plugging and unplugging. The fan is easy to install and connect, and it is easy to standardize the micro fan product, thereby realizing mass production and having high social benefits.

[0044] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model. As described in the above embodiments of this utility model, other fans obtained using the same or similar structures are all within the protection scope of this utility model.

Claims

1. A driveless micro fan structure comprising a housing and a rotor assembly, characterized by: It also includes a coreless stator coil and metal contacts. The coreless stator coil is located on the bottom surface inside the housing. The metal contacts are located on the surface of the housing and connected to the coreless stator coil. There is no driving circuit in the connection line between the metal contacts and the coreless stator coil. The rotor assembly is rotatably disposed inside the housing corresponding to the position of the coreless stator coil.

2. The driveless micro fan structure according to claim 1, wherein: The outer casing includes an outer frame assembly and a top cover, the top cover being fastened to the outer frame assembly.

3. The micro fan structure without drive circuit according to claim 2, characterized in that: The bottom surface of the outer frame assembly is provided with a driveless element FPC, the coreless stator coil is welded to the driveless element FPC, and a lead frame is embedded in the outer frame assembly. One end of the lead frame is connected to the driveless element FPC, and the other end is connected to the metal contact.

4. The micro fan structure without drive circuit according to claim 2, characterized in that: Sealant is applied between the outer frame assembly and the top cover.

5. The micro fan structure without drive circuit according to any one of claims 2-4, characterized in that: The metal contacts are located on the bottom or side of the outer frame assembly.

6. The micro fan structure without drive circuit according to claim 1, characterized in that: The housing includes an LDS base, a side frame, and a top cover. The side frame is disposed on the LDS base, and the top cover is attached to the side frame. The LDS base is provided with LDS circuitry. One end of the LDS circuitry is provided with a solder pad, and the other end is connected to the metal contact. The coreless stator coil is soldered to the solder pad.

7. The micro fan structure without drive circuit according to claim 6, characterized in that: The LDS base is equipped with positioning posts for positioning the coreless stator coil.

8. The micro fan structure without drive circuit according to claim 6, characterized in that: Sealant is provided between the LDS base and the side frame.

9. The micro fan structure without drive circuit according to any one of claims 6-8, characterized in that: The metal contacts are located on the bottom surface of the LDS base.

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