IC assembly structure of portable fan brushless motor

Abstract

The utility model discloses an IC assembly structure of a portable fan brushless motor, comprising a PCB and a motor stator fixedly arranged on one side of the PCB, the motor stator comprises a plurality of windings, the plurality of windings are uniformly arranged around the central axis of the motor stator, the edge of the PCB is at least provided with a first abdicating gap, and the first abdicating gap is provided with a second abdicating gap. A first receding notch is formed in the middle of the PCB, a Hall IC is arranged on the PCB in an electrical connection mode, the Hall IC is arranged in an axial projection area of the first receding notch, a pin of the Hall IC extends towards the middle area of the PCB and is electrically connected with the PCB, and the Hall IC is laid on the side, opposite to the motor stator, of the PCB. And after assembly, the shape is regular, the positioning is accurate, and the sensing sensitivity of the Hall IC can be effectively guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of brushless motor technology, specifically to an IC assembly structure for a portable fan brushless motor. Background Technology

[0002] The working principle of a brushless motor is based on electronic commutation technology. The motor has multiple windings inside, and rotation is achieved by controlling the sequence and timing of energizing these windings. A position detector (such as a Hall effect IC) detects the rotor's position and transmits the position signal to the IC. The IC generates switching signals based on these signals, controlling the switching state of the power transistors, thereby controlling the motor's operation. In this way, brushless motors can achieve efficient and precise control.

[0003] Hall ICs are typically placed at the midpoint of two adjacent stator phase windings, matching the rotor pole spacing, with a distance of 1 / 2 pole pitch between them.

[0004] Brushless motors used in portable fans typically incorporate a Hall effect IC. There are two common assembly methods for the Hall effect IC and the PCB board. One method involves creating through-holes on the PCB board, through which the Hall effect IC's pins pass and are secured and electrically connected by solder. In this method, the Hall effect IC extends towards the stator winding side, effectively shortening the sensing distance and enhancing sensing sensitivity. However, this structure requires relatively high standardization and precision, making automated production impossible and resulting in low production efficiency. Furthermore, the assembled Hall effect IC may exhibit misalignment, severely affecting the finished product's appearance and uniformity. It is also susceptible to varying degrees of magnetic field interference. Please refer to the attached diagram in the instruction manual. Figure 3 Another method involves placing the Hall IC flat on the PCB board on the side opposite to the stator windings. This assembly method enables automated production and improves efficiency, but the sensing sensitivity is weaker because the Hall IC is farther away from the stator windings. Please refer to the attached diagram in the instruction manual. Figure 4 . Utility Model Content

[0005] The purpose of this invention is to provide an IC assembly structure for a portable brushless fan motor, which not only enables automated processing and production, but also produces a uniform shape and precise positioning after assembly, effectively ensuring the sensitivity of the Hall IC sensor and solving the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: an IC assembly structure for a portable fan brushless motor, comprising a PCB board and a motor stator fixed to one side of the PCB board. The motor stator includes multiple windings, which are evenly arranged around the central axis of the motor stator. At least one first clearance notch is provided at the edge of the PCB board. A Hall IC is electrically connected to the PCB board. The Hall IC is located within the axial projection area of ​​the first clearance notch, and the pins of the Hall IC extend toward the middle area of ​​the PCB board and are electrically connected to the PCB board. The Hall IC is laid flat on the side of the PCB board facing away from the motor stator.

[0007] Preferably, the first clearance notch is set at the midpoint of two adjacent phase windings of the motor stator.

[0008] Preferably, when the Hall IC is subjected to an external force toward the side where the motor stator is located, its pins will deform and eventually pass through the first clearance gap and be set perpendicular to the PCB board.

[0009] Preferably, a second clearance notch is provided at the edge of the PCB board, with the central axis of the PCB board as the center of symmetry, and the second clearance notch is located in the mirror area of ​​the first clearance notch.

[0010] Preferably, the first clearance notch is provided in multiple ways.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] This invention not only enables automated processing and production, but also produces uniformly shaped and precisely positioned components after assembly, effectively ensuring the sensitivity of the Hall IC sensor. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ;

[0014] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the structure of a prior art embodiment of the present utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the prior art embodiment two of this utility model.

[0017] In the diagram: 1 PCB board; 2 motor stator; 3 winding; 4 Hall IC; 5 first clearance notch; 6 second clearance notch. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-2 An IC assembly structure for a portable fan brushless motor includes a PCB board 1 and a motor stator 2 fixed to one side of the PCB board 1. The motor stator 2 includes multiple windings 3, which are evenly arranged around the central axis of the motor stator 2. At least one first clearance notch 5 is provided at the edge of the PCB board 1. The first clearance notch 5 is located at the midpoint of two adjacent phase windings of the motor stator 2. A Hall IC 4 is electrically connected to the PCB board 1. The Hall IC 4 is located within the axial projection area of ​​the first clearance notch 5, and the pins of the Hall IC 4 extend toward the middle area of ​​the PCB board 1 and are electrically connected to the PCB board 1. The Hall IC 4 is laid flat on the side of the PCB board 1 facing away from the motor stator 2. When the Hall IC 4 is subjected to an external force toward the side of the motor stator 2, its pins will deform and eventually extend past the first clearance notch 5 and be perpendicular to the PCB board 1.

[0020] A second clearance notch 6 is provided at the edge of the PCB board 1. With the central axis of the PCB board 1 as the center of symmetry, the second clearance notch 6 is located in the mirror area of ​​the first clearance notch 5. When multiple motor PCB boards are arranged on the same board, the second clearance notch 6 can be used to provide clearance space for the bending and forming of the Hall IC 4. Multiple first clearance notches 5 can be provided according to actual needs. When multiple first clearance notches 5 are provided, multiple second clearance notches 6 can be provided accordingly to meet the PCB board processing and layout requirements.

[0021] In actual production and processing, a large PCB board can simultaneously house multiple motor PCB boards 1. This approach aims to improve production efficiency and PCB board utilization. The arrangement of multiple PCB boards on one board is a common production process in the electronics manufacturing field. In automated production, the Hall IC 4 is transported to the designated position by automated production equipment. Then, the Hall IC 4 is fixed to the PCB board 1 by spot welding technology. After the Hall IC 4 is correctly fixed to the PCB board 1, the Hall IC 4 is pressed by a molding fixture to make it bend 90 degrees across the PCB board 1. At this point, the assembly of the Hall IC 4 is completed.

[0022] In summary, this utility model not only enables automated processing and production, but also produces uniformly shaped and precisely positioned components after assembly, effectively ensuring the sensitivity of the Hall IC 4 sensor.

[0023] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0024] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An IC assembly structure for a portable fan brushless motor, comprising a PCB board (1) and a motor stator (2) fixed on one side of the PCB board (1), wherein the motor stator (2) comprises a plurality of windings (3), the plurality of windings (3) being uniformly arranged around the central axis of the motor stator (2), characterized in that: At least one first clearance notch (5) is provided at the edge of the PCB board (1). A Hall IC (4) is electrically connected to the PCB board (1). The Hall IC (4) is located in the axial projection area of ​​the first clearance notch (5), and the pins of the Hall IC (4) extend toward the middle area of ​​the PCB board (1) and are electrically connected to the PCB board (1). The Hall IC (4) is laid flat on the side of the PCB board (1) facing away from the motor stator (2).

2. The IC assembly structure for a portable fan brushless motor according to claim 1, characterized in that: The first clearance gap (5) is set at the midpoint of the two adjacent phase windings of the motor stator (2).

3. The IC assembly structure for a portable fan brushless motor according to claim 1, characterized in that: When the Hall IC (4) is subjected to an external force on the side of the motor stator (2), its pins will deform and eventually pass through the first clearance gap (5) and be set perpendicular to the PCB board (1).

4. The IC assembly structure for a portable fan brushless motor according to claim 1, characterized in that: The PCB board (1) has a second clearance notch (6) at its edge. With the central axis of the PCB board (1) as the center of symmetry, the second clearance notch (6) is located in the mirror area of ​​the first clearance notch (5).

5. The IC assembly structure for a portable fan brushless motor according to any one of claims 1 to 4, characterized in that: The first clearance gap (5) is provided in multiple ways.

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