Hall sensor

Abstract

The utility model belongs to the technical field of sensors, and particularly relates to a Hall sensor. The utility model is characterized in that a support rib for supporting the lower surface of a magnet is arranged on the periphery of a central tube in a shell, and a fixed edge is arranged on the outer circumference, relative to the magnet, in the shell; a first limiting rib corresponding to the air gap is arranged in the shell; a second limiting rib matched with two end surfaces of a coil wound on the soft magnetic core is arranged in the shell; a connecting bonding pad of the Hall element is arranged at the position, corresponding to the first limiting rib, of the PCB, and a pin of the Hall element is connected with the connecting bonding pad; the first limiting rib is matched with the lower part of the soft magnetic core air gap; and the Hall element is inserted into the upper part of the air gap of the soft magnetic core. According to the utility model, the problem that the measurement precision is reduced due to an unstable magnetic circuit is avoided, the structure is simple, the assembly is convenient, the batch production is facilitated, and the product performance, the production efficiency and the product qualification rate are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a Hall sensor. Background Art

[0002] The existing Hall sensor shell structure is usually square, with four straight edges, a support structure at the bottom to support the coil and circuit board, and a circular hole in the middle for the cable to pass through. There are mounting holes at the four corners of the shell to fix the circuit board. However, there are several problems in the existing Hall sensor design, which affect its performance and measurement accuracy: 1. The air gap lacks a support structure: There is no special support structure inside the existing Hall sensor to maintain the stability of the air gap. Since soft magnetic materials need to be wound with a large number of coils, the soft magnetic deformation is easily caused during the winding process, which makes the reserved air gap smaller. This change in the air gap will cause the magnetic circuit to be unstable and affect the measurement accuracy.

[0003] 2. Hall element installation is difficult: In the existing Hall sensor design, it is difficult to ensure that the Hall element is installed in full correspondence with the soft magnetic center. Since the center position of the Hall element and the soft magnetic cannot be accurately aligned during the installation process, the installation is complicated and affects the measurement effect of the sensor.

[0004] 3. Changes in the distance between the coil and the air gap: In existing Hall sensors, the distance between the coil and the air gap often changes. Since this distance cannot be accurately controlled, the stability of the magnetic circuit is affected, resulting in errors in the sensor's measurement.

[0005] 4. Poor coil stability: The existing Hall sensor design makes it difficult to ensure that the coil remains horizontal and relatively static inside. The coil is prone to tilt and shake during use, further affecting the stability of the air gap, and then affecting the stability of the magnetic circuit and measurement accuracy.

[0006] These problems cause existing Hall sensors to have defects such as inaccurate measurement, unstable magnetic circuit, and complex assembly during use, which limits their performance. Summary of the invention

[0007] The utility model aims at solving the above problems and provides a Hall sensor with high detection accuracy and easy assembly.

[0008] In order to achieve the above-mentioned purpose of the utility model, the utility model adopts the following technical scheme, which includes a shell, a PCB board, a Hall element and a soft magnetic core with an air gap, the soft magnetic core and the coil wound outside it constitute a magnet, a central tube is arranged in the center of the shell, and the magnet is sleeved outside the central tube, characterized in that: support ribs supporting the lower surface of the magnet are arranged at the periphery of the central tube in the shell, and a fixed edge is arranged in the shell relative to the outer circumference of the magnet; a first limiting rib is arranged in the shell corresponding to the air gap, and a second limiting rib matching the two end surfaces of the coil wound on the soft magnetic core is arranged in the shell; a connecting pad of the Hall element is arranged at a position corresponding to the first limiting rib on the PCB board, and the pin of the Hall element is connected to the connecting pad; the first limiting rib matches the lower part of the air gap of the soft magnetic core; and the Hall element is inserted into the upper part of the air gap of the soft magnetic core.

[0009] As a preferred solution of the utility model, the fixed edge is a protrusion arranged on the inner wall of the shell, and the surface of the protrusion is an arc surface that matches the outer circumferential surface of the magnet.

[0010] As another preferred solution of the utility model, two second limiting ribs are provided, and the two second limiting ribs are arranged oppositely on the outer wall of the central tube and the inner wall of the shell.

[0011] Furthermore, the first limiting rib is arranged between the two second limiting ribs.

[0012] Furthermore, the supporting ribs are provided in plurality and are evenly distributed on the inner bottom surface of the shell.

[0013] Furthermore, the number of the supporting ribs is three, and the three supporting ribs and the first limiting rib are arranged at 90° intervals in pairs, and the fixed edges and the supporting ribs are arranged in one-to-one correspondence.

[0014] As a third preferred solution of the utility model, the shell includes a main body and an upper cover, and the upper cover is connected to the main body by screws.

[0015] Furthermore, a sensor fixing plate and a current direction indicator are provided on the housing.

[0016] Furthermore, the utility model also includes a cable, and the PCB board is provided with an anti-drag hole, and the cable passes through the through hole on the upper cover and the anti-drag hole and is connected to the PCB board.

[0017] The beneficial effects of the utility model are as follows: the utility model inserts the first limiting rib into the air gap of the soft magnetic core to fix the size of the air gap; the second limiting rib limits the position of the two ends of the coil from the air gap after winding, and at the same time, the fixed edge is used to limit the outer circumference of the magnet, so that the position of the magnet and the Hall element is stable and controllable, thereby improving the stability of the magnetic circuit state and avoiding the problem of reduced measurement accuracy caused by unstable magnetic circuit. The utility model has a simple structure and is easy to assemble, which is conducive to mass production and improves product performance, production efficiency and product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the utility model.

[0019] Figure 2 It is a cross-sectional view of the utility model.

[0020] Figure 3 It is an exploded view of the utility model.

[0021] Figure 4 It is a three-dimensional diagram of the shell of the utility model.

[0022] Figure 5 It is a structural schematic diagram of the shell of the utility model.

[0023] Figure 6 yes Figure 5 Top view of the .

[0024] Figure 7 yes Figure 5 A partial enlarged view of .

[0025] Figure 8 yes Figure 7 DD cross-sectional view.

[0026] Fig. 9 It is a schematic diagram of the connection structure between the PCB board and the magnet.

[0027] In the accompanying drawings, 1 is an upper cover, 2 is a shell, 3 is a PCB board, 4 is a soft magnetic core, 5 is a coil, 6 is a Hall element, 7 is a cable, 8 is a screw, 9 is a through hole, 10 is a magnet, 201 is a center tube, 202 is a fixed edge, 203 is a limiting structure, 2031 is a first limiting rib, 2032 is a second limiting rib, 204 is a supporting rib, 205 is a current direction indicator, 206 is a sensor fixing plate, 207 is an arc surface, 301 is a connecting pad, 302 is a glue injection hole, and 401 is an air gap. DETAILED DESCRIPTION

[0028] The utility model comprises a shell 2, a PCB board 3, a Hall element 6 and a soft magnetic core 4 with an air gap 401, the soft magnetic core 4 and the coil 5 wound around the outer surface thereof constitute a magnet 10, a central tube 201 is arranged in the center of the shell 2, and the magnet 10 is sleeved outside the central tube 201, and is characterized in that: a supporting rib 204 for supporting the lower surface of the magnet 10 is arranged in the shell 2 at the periphery of the central tube 201, a fixed edge 202 is arranged in the shell 2 relative to the outer circumference of the magnet 10; the shell 2 has a fixed edge 202 corresponding to the air gap 401; 1 is provided with a first limiting rib 2031, and the housing 2 is provided with a second limiting rib 2032 that matches with the two end surfaces of the coil 5 wound on the soft magnetic core 4; the PCB board 3 is provided with a connecting pad 301 of the Hall element 6 at a position corresponding to the first limiting rib 2031, and the pin of the Hall element 6 is connected to the connecting pad 301; the first limiting rib 2031 matches with the lower part of the air gap 401 of the soft magnetic core 4; the Hall element 6 is inserted into the upper part of the air gap 401 of the soft magnetic core 4.

[0029] As a preferred solution of the present invention, the fixed edge 202 is a protrusion arranged on the inner wall of the shell 2, and the surface of the protrusion is an arc surface 207 that matches the outer circumferential surface of the magnet 10.

[0030] As another preferred solution of the present invention, two second limiting ribs 2032 are provided, and the two second limiting ribs 2032 are oppositely arranged on the outer wall of the central tube 201 and the inner wall of the shell 2 .

[0031] Furthermore, the first limiting rib 2031 is disposed between the two second limiting ribs 2032 .

[0032] Furthermore, the supporting ribs 204 are provided in plurality, and the supporting ribs 204 are evenly distributed on the inner bottom surface of the shell 2 .

[0033] Furthermore, the number of the supporting ribs 204 is three, and the three supporting ribs 204 and the first limiting rib are arranged at 90° intervals in pairs, and the fixed edge 202 and the supporting ribs 204 are arranged in a one-to-one correspondence.

[0034] As a third preferred solution of the present utility model, the housing 2 includes a main body and an upper cover 1 , and the upper cover 1 is connected to the main body by screws 8 .

[0035] Furthermore, a sensor fixing plate 206 and a current direction indicator 205 are provided on the housing 2 .

[0036] Furthermore, the utility model further comprises a cable 7 , and an anti-drag hole is provided on the PCB board 3 , and the cable 7 passes through the through hole 9 and the anti-drag hole on the upper cover 1 and is connected to the PCB board 3 .

[0037] As a fourth preferred solution of the present utility model, a glue injection hole 302 is provided on the PCB board 3 .

[0038] When assembling the utility model, the enameled copper round wire is firstly wound around the soft magnetic core 4, and then the air gap 401 is aligned with the limiting structure 203 formed by the first limiting rib 2031 and the second limiting rib 2032, and the magnet 10 is installed in the shell 2, the air gap 401 is expanded to the standard size by the first limiting rib 2031, and the position of the coil 5 of the magnet 10 is fixed to the exact position by the second limiting rib 2032.

[0039] Then place the Hall element 6 into the air gap 401, fix the position of the Hall element 6, and provide support for the Hall element 6 through the first limiting rib 2031 to ensure that the center of the Hall element 6 corresponds to the center of the soft magnetic core 4, then install the PCB board 3, and solder the Hall element 6 to the PCB board 3.

[0040] After the assembly is completed, preparations for glue filling are started. After the PCB board 3 and the magnet 10 are removed, glue is poured into the shell 2. After the glue is poured to the appropriate position, the assembled PCB board 3 and the magnet 10 are installed in the shell 2. A syringe is used to fill the shell 2 with glue through the two glue filling holes 302 on the PCB board 3. Finally, the components on the entire PCB board 3 are covered with glue.

[0041] Finally, the upper cover 1 is installed, and the upper cover 1 and the PCB board 3 are fixed to the housing 2 using fixing screws 8 .

[0042] It can be understood that the above specific description of the utility model is only used to illustrate the utility model and is not limited to the technical solution described in the embodiments of the utility model. Ordinary technicians in the field should understand that the utility model can still be modified or replaced by equivalents to achieve the same technical effect; as long as the use requirements are met, they are within the protection scope of the utility model.

Claims

1. A Hall sensor, comprising a housing (2), a PCB board (3), a Hall element (6), and a soft magnetic core (4) having an air gap (401), wherein the soft magnetic core (4) and a coil (5) wound around the outer surface thereof constitute a magnet (10), wherein a central tube (201) is arranged at the center of the housing (2), and the magnet (10) is sleeved outside the central tube (201), characterized in that: Support ribs (204) for supporting the lower surface of the magnet (10) are arranged at the periphery of the central tube (201) in the shell (2), and a fixed edge (202) is arranged in the shell (2) relative to the outer circumference of the magnet (10); a first limiting rib (2031) is arranged in the shell (2) corresponding to the air gap (401), and a second limiting rib (2032) is arranged in the shell (2) to match the two end surfaces of the coil (5) wound on the soft magnetic core (4); a connecting pad (301) of the Hall element (6) is arranged at a position on the PCB board (3) corresponding to the first limiting rib (2031), and a pin of the Hall element (6) is connected to the connecting pad (301); the first limiting rib (2031) matches the lower part of the air gap (401) of the soft magnetic core (4); and the Hall element (6) is inserted into the upper part of the air gap (401) of the soft magnetic core (4).

2. A Hall sensor according to claim 1, characterized in that: The fixed edge (202) is a protrusion arranged on the inner wall of the housing (2), and the surface of the protrusion is an arc-shaped surface (207) that matches the outer circumferential surface of the magnet (10).

3. A Hall sensor according to claim 1, characterized in that: The second limiting ribs (2032) are provided in two numbers, and the two second limiting ribs (2032) are arranged oppositely on the outer wall of the central tube (201) and the inner wall of the shell (2).

4. A Hall sensor according to claim 3, characterized in that: The first limiting rib (2031) is arranged between the two second limiting ribs (2032).

5. A Hall sensor according to claim 4, characterized in that: The supporting ribs (204) are arranged in plurality, and the supporting ribs (204) are evenly distributed on the inner bottom surface of the shell (2).

6. A Hall sensor according to claim 5, characterized in that: The number of the supporting ribs (204) is three, and the three supporting ribs (204) and the first limiting rib are arranged at 90° intervals in pairs, and the fixed edges (202) and the supporting ribs (204) are arranged in a one-to-one correspondence.

7. A Hall sensor according to claim 1, characterized in that: The housing (2) comprises a main body and an upper cover (1), and the upper cover (1) is connected to the main body via screws (8).

8. A Hall sensor according to claim 7, characterized in that: The housing (2) is provided with a sensor fixing plate (206) and a current direction indicator (205).

9. A Hall sensor according to claim 7, characterized in that: It also comprises a cable (7), the PCB board (3) is provided with an anti-drag hole, and the cable (7) passes through the through hole (9) and the anti-drag hole on the upper cover (1) and is connected to the PCB board (3).

10. A Hall sensor according to claim 1, characterized in that: The PCB board (3) is provided with glue injection holes (302).

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