Hall switch mounting structure for outer rotor motor

Abstract

This utility model discloses a Hall switch mounting structure for an external rotor motor, including a motor rotor, a motor stator, a Hall circuit board, a circuit board mounting sleeve, and a tail end mounting bracket. The motor rotor has rotor magnetic poles bonded inside, and there is a certain gap between the lower end face of the rotor magnetic poles and the motor stator. The motor stator and the circuit board mounting sleeve are fixed together by the tail end mounting bracket, forming a stable structure and an annular plane. The annular plane is used to attach the Hall circuit board, and a surface-mount Hall switch is soldered onto the Hall circuit board with the magnetic field sensing end face upwards. The Hall circuit board is adhered to the annular plane formed after the circuit board mounting sleeve and the motor stator are connected using high-temperature adhesive. This structure uses less space, has a smaller gap between the Hall switch and the magnetic poles, can better detect the motor rotation status, and improves signal stability.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, specifically to a Hall switch mounting structure for an external rotor motor. Background Technology

[0002] Currently, external rotor brushless DC motors are widely used in the market. Many of these motors require higher control precision and response speed, making the addition of Hall effect switches for auxiliary control a common practice. There are generally two methods: one is to embed the Hall effect switch into the stator during motor manufacturing, with the signal line extending inside the motor. This method is suitable for situations with a large gap between the stator and rotor, but current motors are relatively small, and the gap between the stator and rotor is also small, resulting in tighter assembly and making installation difficult. The other method is to install the Hall effect switch circuit board at the tail end of the stator. The disadvantage of this method is that the Hall effect switch is far from the rotor magnetic poles, requiring a long extension to reach them. During motor rotation, the Hall effect signal is easily distorted by motor vibration, leading to unstable motor control. Utility Model Content

[0003] The purpose of this invention is to provide a Hall switch mounting structure for an external rotor motor, which is applicable to small external rotor motors with small mounting gaps, and solves the problem of Hall signal distortion caused by the long mounting position when the motor rotates at high speed.

[0004] To achieve the above objectives, a Hall switch mounting structure for an external rotor motor is provided, comprising a motor rotor, a motor stator, a Hall circuit board, a circuit board mounting sleeve, and a tail end mounting bracket. The motor rotor has rotor magnetic poles adhered inside, and there is a certain gap between the lower end face of the rotor magnetic poles and the motor stator. The motor stator and the circuit board mounting sleeve are fixed together by the tail end mounting bracket to form a stable structure and an annular plane. The annular plane is used to adhere the Hall circuit board, and a surface-mount Hall switch is soldered onto the Hall circuit board, with the magnetic field sensing end face upwards.

[0005] The Hall circuit board is glued to the annular plane formed after the circuit board fixing sleeve and the motor stator are connected using high temperature adhesive. After gluing, the upper end face of the Hall switch is exactly below the lower end face of the rotor magnetic pole inside the motor rotor, with a small gap.

[0006] According to the Hall switch mounting structure of an external rotor motor, the Hall circuit board is a flexible PCB.

[0007] According to the Hall switch mounting structure of an external rotor motor, the circuit board fixing sleeve is provided with a motor output notch and a Hall signal line notch for easy wiring.

[0008] According to the Hall switch mounting structure of an external rotor motor, a Hall signal output line soldering part is provided on the upper part of the Hall circuit board.

[0009] According to the Hall switch mounting structure of an external rotor motor, stator coils are wound on the stator core of the motor stator.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This Hall switch mounting structure for an external rotor motor uses less space and has a smaller gap between the Hall switch and the magnetic pole, enabling better detection of the motor's rotation status and improving signal stability.

[0012] Additional aspects and advantages of this 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

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0014] Figure 1 This is a perspective view of the Hall switch mounting structure for an external rotor motor according to the present invention.

[0015] Figure 2 This is a cross-sectional view of the Hall switch mounting structure for an external rotor motor according to this utility model;

[0016] Figure 3 This is a schematic diagram of the Hall circuit board of the Hall switch mounting structure for an external rotor motor according to this utility model;

[0017] Figure 4 This is a diagram showing the position of the Hall switch and the rotor magnetic poles in the Hall switch mounting structure of an external rotor motor according to this utility model.

[0018] In the diagram: 1. Motor rotor; 2. Motor stator; 3. Hall circuit board; 4. Hall switch; 5. Circuit board mounting sleeve; 6. Tail end mounting bracket; 7. Motor output notch; 8. Hall signal line notch; 9. Hall signal output line soldering part; 10. Rotor magnetic pole; 11. Stator coil. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-4 This utility model provides a technical solution: a Hall switch mounting structure for an external rotor motor, including a motor rotor 1, a motor stator 2, a Hall circuit board 3, a circuit board fixing sleeve 5, and a tail end fixing bracket 6. The motor rotor 1 has rotor magnetic poles 10 bonded inside. There is a certain gap between the lower end face of the rotor magnetic poles 10 inside the motor rotor 1 and the motor stator 2. The motor stator 2 and the circuit board fixing sleeve 5 are fixed together by the tail end fixing bracket 6 to form a stable structure and an annular plane. The annular plane is used to bond the Hall circuit board 3. A surface-mount Hall switch 4 is soldered onto the Hall circuit board 3, with the magnetic field sensing end face upwards. Three surface-mount Hall switches 4 are distributed on the Hall circuit board 3 at 120° intervals in a circular direction. The Hall switches 4 are used to detect changes in the magnetic poles inside the motor rotor 1. When the motor rotates, the motor rotor 1 drives the magnetic poles to rotate together. The alternating changes in the magnetic poles sense the Hall switches 4, and the Hall switches 4 can detect the rotation signal of the motor and output it to the control system.

[0021] The Hall circuit board 3 is glued to the annular plane formed after the circuit board fixing sleeve 5 and the motor stator 2 are connected using high temperature adhesive. After gluing, the upper end face of the Hall switch 4 is exactly below the lower end face of the rotor magnetic pole 10 inside the motor rotor 1, with a small gap.

[0022] The Hall circuit board 3 is a flexible PCB board. The circuit board fixing sleeve 5 is provided with a motor output notch 7 and a Hall signal line notch 8 for easy wiring.

[0023] The Hall circuit board 3 has a Hall signal output line soldering part 9 on its top, which can solder 5 signal lines, namely 3 Hall switch signals, positive power supply and negative power supply.

[0024] Stator coil 11 is wound on the stator core of motor stator 2.

[0025] Working principle: Before installation, the motor rotor 1 and motor stator 2 are separate. The circuit board mounting sleeve 5 is placed from the bottom of the motor upwards around the motor stator 2, allowing the motor wires to extend from the motor wire outlet 7 of the circuit board mounting sleeve 5. The tail end mounting bracket 6 is connected to the circuit board mounting sleeve 5 and the motor stator 2 respectively using screws at the motor tail end. This creates a fixed structure between the motor stator 2, circuit board mounting sleeve 5, and tail end mounting bracket 6, forming a ring-shaped plane on top. The circular Hall circuit board 3 with the Hall switch 4 soldered onto it is then inserted into the motor shaft from the bottom. High-temperature adhesive is used to attach the Hall circuit board 3 to the plane formed by the circuit board mounting sleeve 5 and the motor stator 2. The angle of the Hall circuit board 3 is adjusted by rotating it so that its Hall signal line outlet aligns with the Hall signal line outlet 8 of the circuit board mounting sleeve 5. After the Hall circuit board 3 is firmly attached, the motor rotor 1 is installed. After installation, the lower end face of the rotor magnetic pole 10 inside the motor rotor 1 and the upper end face of the Hall switch 4 on the Hall circuit board 3 should have a 1-2mm gap. The motor rotor 1 should be manually rotated; if there is no friction, it is ready.

[0026] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A Hall switch mounting structure of an outer rotor motor, comprising a motor rotor (1), a motor stator (2), a Hall circuit board (3), a circuit board fixing sleeve (5), and a tail end fixing frame (6), characterized in that, The motor rotor (1) has a rotor magnetic pole (10) attached inside. There is a certain gap between the lower end face of the rotor magnetic pole (10) inside the motor rotor (1) and the motor stator (2). The motor stator (2) and the circuit board fixing sleeve (5) are fixed together by the tail end fixing bracket (6) to form a stable structure and an annular plane. The annular plane is used to attach the Hall circuit board (3). A surface mount Hall switch (4) is soldered on the Hall circuit board (3). The magnetic field sensing end face of the Hall switch (4) is facing upward. The Hall circuit board (3) is glued to the annular plane formed by the connection of the circuit board fixing sleeve (5) and the motor stator (2) using high temperature glue. After gluing, the upper end face of the Hall switch (4) is exactly below the lower end face of the rotor magnetic pole (10) inside the motor rotor (1), with a small gap.

2. The Hall switch mounting structure for an external rotor motor as described in claim 1, characterized in that: The Hall circuit board (3) is a flexible PCB.

3. The Hall switch mounting structure for an external rotor motor as described in claim 1, characterized in that: The circuit board fixing sleeve (5) is provided with a motor output notch (7) and a Hall signal line notch (8) for easy wiring.

4. The Hall switch mounting structure for an external rotor motor as described in claim 1, characterized in that: A Hall signal output line soldering part (9) is provided on the upper part of the Hall circuit board (3).

5. The Hall switch mounting structure for an external rotor motor as described in claim 1, characterized in that: The stator core of the motor stator (2) is wound with stator coils (11).

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