Motor assembly of miniature fan, assembling method and miniature fan

Abstract

The invention belongs to the technical field of fans, and discloses a motor assembly of a miniature fan, an assembling method and the miniature fan, the motor assembly comprises a shell, a flexible circuit board and a plurality of coils, the shell is provided with a mounting part and a plurality of protruding parts, the protruding parts are arranged around the mounting part, the mounting part is used for mounting a rotating part, and the flexible circuit board is arranged on the mounting part. The flexible circuit board is installed on the shell, the flexible circuit board is provided with a receding hole, the installation parts and the protruding parts are arranged in the receding hole, the multiple coils and the multiple protruding parts are connected in a one-to-one correspondence and inserted mode, and the coils are electrically connected with the flexible circuit board; wherein the flexible circuit board and the plurality of coils are fixed on the shell through a glue pouring layer. The motor assembly is simple in assembly process, high in product concentricity precision, accurate in coil arrangement array angle, accurate in part size and good in waterproof performance, and the risk of coil breakage damage is reduced.

Description

Technical Field

[0001] This invention relates to the field of micro fan technology, and more particularly to a motor assembly, assembly method, and micro fan for a micro fan. Background Technology

[0002] In the current micro-motor manufacturing industry, there are many technical challenges in the assembly process of coils and flexible circuit boards. In the traditional manufacturing method, the coil is first installed on a special fixture, and then glue is applied; after covering it with the flexible circuit board, it is assembled and cured with the fixture; after curing, the flexible circuit board product assembly is detached from the fixture and the fixture is cleaned; the flexible circuit board assembly is then positioned and assembled with the base.

[0003] Traditional manufacturing methods cannot guarantee concentricity and uniformity of arrangement angles when assembling and positioning the coil and fixture, requiring secondary positioning and concentricity with the base. This process is complex and precision is difficult to guarantee. Furthermore, the special fixture requires repeated molding, increasing process complexity. Additionally, after the flexible circuit board and coil are cured, glue residue is easily left when they are removed from the fixture, and coil detachment can damage the enameled wire, leading to product scrap. Moreover, the components on the back of the base are only protected with glue, which is insufficient to meet waterproof requirements. Furthermore, traditional processes are difficult to automate, resulting in low production efficiency, poor product consistency and stability, and an inability to meet the high performance and high reliability requirements of modern electronic products for micro motors. Summary of the Invention

[0004] The first objective of this invention is to provide a motor assembly for a miniature fan, which has a simple assembly process, high product concentricity accuracy, precise coil array angle, accurate component dimensions, reduced risk of coil breakage damage, and good waterproof performance.

[0005] The second objective of this invention is to provide a method for assembling a motor assembly for a miniature fan. This assembly method is simple in process, has high product concentricity accuracy, precise coil array angle, accurate part dimensions, reduces the risk of coil breakage damage, and has good waterproof performance.

[0006] The third objective of this invention is to provide a miniature fan that has a simple assembly process, high reliability, and good waterproof performance.

[0007] To achieve this objective, the present invention adopts the following technical solution: This invention discloses a motor assembly for a miniature fan, comprising: a housing having a mounting portion and a plurality of protrusions surrounding the mounting portion, the mounting portion being used to mount a rotating component; a flexible circuit board mounted on the housing, the flexible circuit board having clearance holes, the mounting portion and the protrusions being disposed inside the clearance holes; and a plurality of coils, the plurality of coils being inserted into the plurality of protrusions in a one-to-one correspondence, and the coils being electrically connected to the flexible circuit board; wherein the flexible circuit board and the plurality of coils are all fixed to the housing by an adhesive layer.

[0008] In some embodiments, the housing is provided with a mounting groove, the mounting portion and the protrusion are both disposed in the mounting groove, and the flexible circuit board is fixed to the mounting groove.

[0009] In some specific embodiments, the mounting groove is provided with the potting layer, which is used to seal and fix the flexible circuit board and the plurality of coils in the mounting groove.

[0010] In some specific embodiments, at least one through hole is provided on the bottom wall of the mounting groove, the through hole being used to accommodate electrical components protruding from the flexible circuit board.

[0011] In some specific embodiments, the housing has an opening communicating with the mounting slot, and a portion of the flexible circuit board extends out of the housing from the opening and is electrically connected to an external power source.

[0012] In some embodiments, the housing includes: a bottom shell having the mounting portion and the protrusion thereon; and a cover shell detachably mounted to the bottom shell.

[0013] This invention also discloses a method for assembling a motor assembly for a miniature fan, comprising: S1: Fix the flexible circuit board to the housing; S2: Multiple coils are fitted one-to-one onto multiple protrusions, and the multiple coils are electrically connected to the flexible circuit board respectively; S3: Apply adhesive to the outer casing to form an adhesive layer, thereby fixing the flexible circuit board and the coil to the outer casing.

[0014] In some embodiments, the outer casing includes a bottom shell and a top shell, wherein the bottom shell has a mounting groove, and the protrusion is disposed on the bottom wall of the mounting groove; wherein In step S1, the flexible circuit board is bonded to the bottom wall of the mounting groove; In step S2, the coil is bonded to the bottom wall of the mounting groove; In step S3, the potting layer is formed within the mounting groove.

[0015] In some embodiments, after step S3, the method further includes: S4: fastening the cover to the bottom shell.

[0016] The present invention also discloses a miniature fan, including the motor assembly and fan blades of the miniature fan described above. The fan blades include an impeller body and a rotating shaft, the rotating shaft being inserted into a mounting part, and the impeller body being fixed to the rotating shaft.

[0017] The beneficial effects of the above technical solution are as follows: In the actual installation process, multiple coils are inserted one-to-one into multiple protrusions on the outer casing. Then, the flexible circuit board is installed onto the outer casing, and glue is poured into the casing. After the glue cures, it forms a potting layer. Compared with the existing technology, which requires a special fixture to position the coils and protrusions on the outer casing to fix the coils, this simplifies the assembly process of the motor assembly and ensures high concentricity accuracy of the motor assembly, precise coil array angle, and accurate part dimensions. At the same time, since there is no need to separate the motor assembly from the fixture after the glue cures during the process, the risk of coil breakage is reduced. Furthermore, the flexible circuit board and multiple coils are all fixed to the outer casing by the potting layer, and both the flexible circuit board and coils are sealed within the potting layer, improving the waterproof performance of the motor assembly.

[0018] Additional aspects and advantages of the 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

[0019] Figure 1 This is a schematic diagram of the structure of a miniature fan according to an embodiment of the present invention; Figure 2 This is an exploded structural diagram of a miniature fan according to an embodiment of the present invention; Figure 3 This is an exploded view of the motor assembly of the miniature fan according to an embodiment of the present invention; Figure 4 This is a flowchart illustrating the assembly steps of the motor assembly method for a micro fan according to an embodiment of the present invention.

[0020] Figure label: 100. Motor assembly; 110. Housing; 111. Bottom shell; 1111. Mounting slot; 1112. Mounting part; 1113. Protrusion; 1114. Through hole; 1115. Opening; 1116. Plug-in part; 1117. Locking protrusion; 112. Cover shell; 1121. Plug-in slot; 1122. Locking hole; 120. Coil; 130. Flexible circuit board; 131. Clearance hole; 200. Fan blade; 210. Impeller body; 220. Rotating shaft; 300. Bearing. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0022] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0023] In the description of this embodiment, the terms "upper," "lower," "left," "right," "front," and "rear," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] This invention discloses a motor assembly 100 for a miniature fan (hereinafter referred to as motor assembly 100 for ease of description), see reference Figures 1-3As shown, the motor assembly 100 includes a housing 110, a flexible circuit board 130, and multiple coils 120. The housing 110 has a mounting portion 1112 and multiple protrusions 1113, with the protrusions 1113 surrounding the mounting portion 1112. The mounting portion 1112 is used to mount rotating components. The flexible circuit board 130 is mounted on the housing 110 and has clearance holes 131. The mounting portion 1112 and the protrusions 1113 are both located inside the clearance holes 131. The multiple coils 120 are inserted into the multiple protrusions 1113 one-to-one, and the coils 120 are electrically connected to the flexible circuit board 130. The flexible circuit board 130 and the multiple coils 120 are both fixed to the housing 110 by a potting layer. Understandably, during the actual installation process, multiple coils 120 are inserted one-to-one into the multiple protrusions 1113 of the housing 110, then the flexible circuit board 130 is mounted onto the housing 110, and then glue is poured into the housing 110. After the glue cures, it forms a potting layer. Compared to the prior art, which requires a special fixture to position the coils 120, in this embodiment, protrusions 1113 are provided on the housing 110 to fix the coils 120. This simplifies the assembly process of the motor assembly 100 and ensures high concentricity accuracy of the motor assembly 100, precise arrangement angle of the coils 120, and accurate part dimensions. At the same time, since it is not necessary to separate the motor assembly 100 from the fixture after the glue cures during the process, the risk of coil 120 breakage damage is reduced.

[0025] It should be further explained that in the prior art, the electrical components of the motor assembly 100 are only protected by conformal coating after patch mounting, or there is no protection at all. In this embodiment of the invention, after the flexible circuit board 130, coil 120 and housing 110 are fixed, the flexible circuit board 130 and multiple coils 120 are fixed to the housing 110 by potting adhesive, which can realize automated quantitative packaging, improve waterproofing, and fuse and seal the electrical components with the entire housing 110, thereby achieving automation while improving the sealing effect.

[0026] Optionally, to prevent displacement of the flexible circuit board 130 and coil 120 during the potting process, adhesive can be applied to the flexible circuit board 130 and coil 120 during installation, so that the flexible circuit board 130 is bonded to the housing 110 and the coil 120 is bonded to the protrusion 1113.

[0027] Optional, see reference Figure 3As shown, the outer casing 110 is provided with a mounting groove 1111, and the mounting portion 1112 and the protrusion 1113 are both provided within the mounting groove 1111. The flexible circuit board 130 is fixed to the mounting groove 1111. It is understood that by providing the mounting portion 1112 on the outer casing 110, and with the mounting portion 1112 and the protrusion 1113 located within the mounting groove 1111, during installation, the flexible circuit board 130 and the coil 120 are both located within the mounting groove 1111. During the glue filling process, no external fixture is needed to form a glue-filling cavity; the mounting groove 1111 itself can serve as a cavity to hold the glue, facilitating the process. Further optionally, a glue-filling layer is provided within the mounting groove 1111. This glue-filling layer is used to seal and fix the flexible circuit board 130 and multiple coils 120 within the mounting groove 1111. It is understood that by placing the glue-filling layer within the mounting groove 1111, the entire glue-filling layer is relatively flat after glue filling, facilitating the installation of rotating components.

[0028] Optional, see reference Figure 3 As shown, at least one through hole 1114 is provided on the bottom wall of the mounting groove 1111. The through hole 1114 is used to accommodate electrical components protruding from the flexible circuit board 130. It is understood that by providing the through hole 1114 on the bottom wall of the mounting groove 1111 to accommodate the electrical components protruding from the flexible circuit board 130, the flexible circuit board 130 can fit well against the bottom wall of the mounting groove 1111 during installation, which helps improve the installation stability of the flexible circuit board 130. During the application of adhesive, the adhesive can also fill into the through hole 1114. After curing, the adhesive can protect the electrical components protruding from the flexible circuit board 130, improving the waterproof performance of the motor assembly 100.

[0029] Optional, see reference Figure 3 As shown, the housing 110 has an opening 1115 communicating with the mounting groove 1111. A portion of the flexible circuit board 130 extends out of the housing 110 through the opening 1115 and is electrically connected to an external power source. It is understood that providing the opening 1115 on the housing 110, with a portion of the flexible circuit board 130 extending from it, facilitates power connection to the flexible circuit board 130 without requiring the external power supply cable to be inserted into the mounting groove 1111, thus simplifying assembly. Furthermore, during installation, the opening 1115 also serves as a limiting and fixing mechanism, ensuring the flexible circuit board 130 remains stably within the mounting groove 1111.

[0030] Optional, see reference Figure 3As shown, the outer casing 110 includes a bottom casing 111 and a top casing 112. The bottom casing 111 has a mounting portion 1112 and a protrusion 1113. The top casing 112 is detachably mounted on the bottom casing 111. It can be understood that by disassembling the outer casing 110 into the bottom casing 111 and the top casing 112, in the actual assembly process, the flexible circuit board 130 and the coil 120 are first installed on the bottom casing 111 and fixed with glue, and then the top casing 112 is installed on the bottom casing 111. Compared with the one-piece outer casing 110, the assembly is more convenient, and during the installation of the coil 120, the coil 120 will not rub against other parts of the outer casing 110, thus improving the protection of the coil 120.

[0031] Alternatively, the bottom shell 111 is provided with a plug-in portion 1116, and the cover shell 112 is provided with a plug-in groove 1121, wherein the plug-in portion 1116 can be plugged into the plug-in groove 1121. It can be understood that the connection between the plug-in portion 1116 and the plug-in groove 1121 facilitates the assembly of the bottom shell 111 and the cover shell 112, and can improve the connection stability of the bottom shell 111 and the cover shell 112 to a certain extent.

[0032] Alternatively, the side wall of the insertion part 1116 is provided with a latching protrusion 1117, and the side wall of the insertion groove 1121 is provided with a latching hole 1122, with the latching protrusion 1117 engaging with the latching hole 1122. It is understood that using the latching protrusion 1117 to insert into the latching hole 1122 to achieve the engagement of the bottom shell 111 and the cover shell 112 simplifies the connection method between the bottom shell 111 and the cover shell 112, eliminating the need for screws or other rotating shafts 220. This facilitates the connection between the bottom shell 111 and the cover shell 112 while also improving the connection stability.

[0033] Alternatively, multiple locking protrusions 1117 and locking holes 1122 may be provided, with locking holes 1122 on both opposite sidewalls of the insertion slot 1121. It can be understood that providing locking holes 1122 on the opposite sidewalls of the insertion slot 1121 achieves lateral fixation of the bottom shell 111 and the cover shell 112, thereby improving the connection stability of the bottom shell 111 and the cover shell 112.

[0034] It should be further noted that the insertion part 1116 can be provided on the cover shell 112, the insertion groove 1121 can be provided on the bottom shell 111, the locking hole 1122 can be provided on the insertion part 1116, and the locking protrusion 1117 can be provided on the side wall of the insertion groove 1121. In other embodiments of the present invention, the bottom shell 111 and the outer shell 110 can also be connected by means of screw connection, bonding, etc., and are not limited to the connection methods described above.

[0035] The advantages of the motor assembly 100 of the present invention are as follows: First, we need to address the challenges of assembling the coil 120 and the flexible circuit board 130, including difficulties in achieving concentricity and poor angle uniformity, which ultimately affect electromagnetic performance. Second: It solves the complexity of repeated molding with special fixtures and reduces the risk of coil 120 being damaged due to repeated hard contact between coil 120 and fixture; Third: It solves the problems of waterproofing and other protection issues for electrical components, while simplifying the process, facilitating automation, and reducing manufacturing costs. This miniature fan has a simple assembly process, high reliability, and good waterproof performance.

[0036] This invention also discloses a method for assembling a motor assembly for a miniature fan, with reference to... Figure 4 As shown, the assembly method includes: S1: Fix the flexible circuit board 130 to the housing 110; S2: Multiple coils 120 are fitted one-to-one onto multiple protrusions 1113, and the multiple coils 120 are electrically connected to the flexible circuit board 130 respectively. S3: Apply adhesive to the housing 110 to form an adhesive layer, thereby fixing the flexible circuit board 130 and the coil 120 to the housing 110.

[0037] Understandably, in the actual installation process, the flexible circuit board 130 is mounted onto the housing 110, and multiple coils 120 are inserted one-to-one into the multiple protrusions 1113 of the housing 110. Then, glue is poured into the housing 110, and after the glue cures, it forms a potting layer. Compared to the prior art, which requires a special fixture to position the coils 120, in this embodiment, protrusions 1113 are provided on the housing 110 to fix the coils 120. This simplifies the assembly process of the motor assembly 100, and ensures high concentricity accuracy of the motor assembly 100, precise arrangement angle of the coils 120, and accurate part dimensions. At the same time, since it is not necessary to separate the motor assembly 100 from the fixture after the glue cures during the process, the risk of coil 120 breakage damage is reduced.

[0038] Optionally, the outer casing 110 includes a bottom casing 111 and a cover casing 112. The bottom casing 111 is provided with a mounting groove 1111, and a protrusion 1113 is provided on the bottom wall of the mounting groove 1111; wherein: In step S1, the flexible circuit board 130 is bonded to the bottom wall of the mounting groove 1111; thereby, displacement of the flexible circuit board 130 during the potting process is avoided, and assembly accuracy is improved.

[0039] In step S2, the coil 120 is bonded to the bottom wall of the mounting groove 1111; thereby, displacement of the coil 120 during the potting process is avoided, and assembly accuracy is improved.

[0040] In step S3, the potting layer is formed within the mounting groove 1111. It is understood that by placing the potting layer within the mounting groove 1111, the entire potting layer becomes relatively flat after potting, facilitating the installation of rotating components.

[0041] Optionally, after step S3, the method further includes: S4: fastening the cover 112 onto the base 111. Specifically, the base 111 is provided with a plug-in portion 1116, and the cover 112 is provided with a plug-in groove 1121, wherein the plug-in portion 1116 can be plugged into the plug-in groove 1121. The side wall of the plug-in portion 1116 is provided with a latching protrusion 1117, and the side wall of the plug-in groove 1121 is provided with a latching hole 1122, wherein the latching protrusion 1117 is latched into the latching hole 1122. Understandably, during the actual assembly process, after the glue has cured to form a potting layer, when installing the cover 112 onto the bottom shell 111, the insertion slot 1121 is aligned with the insertion part 1116, and the cover 112 is pressed down. During the pressing process, the locking protrusion 1117 is engaged into the locking hole 1122 to complete the installation. This simplifies the installation process and ensures the connection stability between the cover 112 and the bottom shell 111.

[0042] The present invention also discloses a miniature fan, including the motor assembly 100 and fan blades 200 described above. The fan blades 200 include an impeller body 210 and a rotating shaft 220. The rotating shaft 220 is inserted into the mounting portion 1112, and the impeller body 210 is fixed to the rotating shaft 220. Due to the presence of the motor assembly 100 described above, the assembly process of this miniature fan is simple, its reliability is high, and its waterproof performance is good.

[0043] To reduce friction between the rotating shaft 220 and the mounting part 1112, a bearing 300 is also provided between the rotating shaft 220 and the mounting part 1112.

[0044] In the description of this specification, references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0045] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A motor assembly for a miniature fan, characterized in that, include: The housing (110) is provided with a mounting portion (1112) and a plurality of protrusions (1113), the plurality of protrusions (1113) being arranged around the mounting portion (1112), the mounting portion (1112) being used to mount rotating components; A flexible circuit board (130) is mounted on the housing (110). The flexible circuit board (130) has a clearance hole (131). The mounting part (1112) and the protrusion (1113) are both located inside the clearance hole (131). Multiple coils (120) are connected to multiple protrusions (1113) in a one-to-one manner, and the coils (120) are electrically connected to the flexible circuit board (130); wherein the flexible circuit board (130) and the multiple coils (120) are fixed to the outer shell (110) by a potting layer.

2. The motor assembly of the miniature fan according to claim 1, characterized in that, The outer casing (110) is provided with a mounting groove (1111), the mounting part (1112) and the protrusion (1113) are both provided in the mounting groove (1111), and the flexible circuit board (130) is fixed in the mounting groove (1111).

3. The motor assembly of the miniature fan according to claim 2, characterized in that, The mounting groove (1111) is provided with the potting layer, which is used to seal and fix the flexible circuit board (130) and the plurality of coils (120) in the mounting groove (1111).

4. The motor assembly of the miniature fan according to claim 2, characterized in that, At least one through hole (1114) is provided on the bottom wall of the mounting groove (1111), and the through hole (1114) is used to accommodate electrical components protruding from the flexible circuit board (130).

5. The motor assembly of the miniature fan according to claim 2, characterized in that, The housing (110) has an opening (1115) communicating with the mounting groove (1111), and a portion of the flexible circuit board (130) extends out of the housing (110) from the opening (1115) and is electrically connected to an external power source.

6. The motor assembly of the miniature fan according to any one of claims 1-5, characterized in that, The outer casing (110) includes: A bottom shell (111) is provided with the mounting portion (1112) and the protrusion (1113); A cover (112) is detachably mounted on the bottom shell (111).

7. A method for assembling a motor assembly for a miniature fan, characterized in that, include: S1: Fix the flexible circuit board (130) to the housing (110); S2: Multiple coils (120) are fitted one-to-one onto multiple protrusions (1113), and the multiple coils (120) are electrically connected to the flexible circuit board (130) respectively; S3: Apply adhesive to the outer casing (110) to form an adhesive layer, thereby fixing the flexible circuit board (130) and the coil (120) to the outer casing (110).

8. The method for assembling the motor assembly of the miniature fan according to claim 7, characterized in that, The outer casing (110) includes a bottom shell (111) and a top shell (112). The bottom shell (111) has a mounting groove (1111), and the protrusion (1113) is located on the bottom wall of the mounting groove (1111). In step S1, the flexible circuit board (130) is bonded to the bottom wall of the mounting groove (1111); In step S2, the coil (120) is bonded to the bottom wall of the mounting groove (1111); In step S3, the potting layer is formed within the mounting groove (1111).

9. The method for assembling the motor assembly of the micro fan according to claim 8, characterized in that, The process after step S3 also includes: S4: Attach the cover (112) to the bottom shell (111).

10. A miniature fan, characterized in that, The micro fan includes a motor assembly and a fan blade (200) as described in any one of claims 1-6, the fan blade (200) including an impeller body (210) and a rotating shaft (220), the rotating shaft (220) being inserted into a mounting portion (1112), and the impeller body (210) being fixed to the rotating shaft (220).

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