Non-contact angular displacement potentiometer

Abstract

A non-contact angular displacement potentiometer comprises: a housing; the circuit board is arranged in the shell, and a Hall sensor is arranged on the circuit board; the rotating shaft is rotationally arranged on the shell and is provided with a first end arranged in the shell; the magnet is connected to the first end and is opposite to the Hall sensor; the axial end face of the first end is provided with a mounting cavity, the magnet is fixedly arranged in the mounting cavity, and the Hall sensor is partially or completely located in the mounting cavity. According to the utility model, the axial size of the angular displacement sensor can be reduced, so that the angular displacement sensor is more miniaturized.

Description

Technical Field

[0001] The utility model relates to a non-contact angular displacement potentiometer, belonging to the technical field of potentiometers. Background Art

[0002] The non-contact angular displacement potentiometer uses the principle that the output voltage of the Hall element is proportional to the external magnetic field and the cosine of the angle between the magnetic sound and the element normal. A magnet is set at the front end of the rotating rotor connected to the rotating shaft, and a magnetic sensor with a gap and relative spacing between the magnets is used to detect the rotation angle of the rotor angular displacement.

[0003] When designing and manufacturing non-contact angular displacement potentiometers, factors such as their lifespan and size must be fully considered.

[0004] A Chinese patent with authorization publication number CN 210268523 U discloses a non-contact angular displacement potentiometer, comprising: a housing; a circuit board disposed inside the housing, with a Hall sensor provided on the circuit board; a rotating shaft disposed along the central axis of the housing, with a first end of the rotating shaft disposed inside the housing and a second end of the rotating shaft disposed outside the housing; a magnet disposed at the first end of the rotating shaft and corresponding to the Hall sensor; the Hall sensor detects the angle of the rotating shaft by detecting the magnetic field strength generated by the magnet and converts the angle into a corresponding voltage signal.

[0005] However, the following problems still exist: 1. There is still some lack of miniaturization, mainly because the magnetic sensor is arranged on the side of the rotating shaft, which increases the axial size of the angular displacement sensor; 2. When installing the magnet, conventional methods such as bonding are often adopted, which are easy to fall off after long-term use, resulting in a shorter service life; 3. The heat dissipation performance of the wiring substrate is relatively poor, and it is prone to high-temperature burning, resulting in a shorter service life. Utility Model Content

[0006] In response to the deficiencies of the prior art, the present application provides a non-contact angular displacement potentiometer to solve at least one of the technical problems.

[0007] A non-contact angular displacement potentiometer, comprising:

[0008] a housing;

[0009] a circuit board disposed inside the housing, wherein a Hall sensor is provided on the circuit board;

[0010] a rotating shaft rotatably disposed on the housing and having a first end disposed in the housing;

[0011] a magnet connected to the first end and facing the Hall sensor;

[0012] An axial end surface of the first end is provided with a mounting cavity, the magnet is fixedly disposed in the mounting cavity, and part or all of the Hall sensor is located in the mounting cavity.

[0013] Preferably, the magnet is fixedly connected to the bottom of the installation cavity.

[0014] Preferably, the magnet is fixedly connected to the bottom of the installation cavity by a glue layer, and a hot melt connection hole 1 is provided at the bottom of the installation cavity, and a hot melt connection hole 2 communicating with the hot melt connection hole 1 is provided at the center of the magnet, and the hot melt connection hole 1 and the hot melt connection hole 2 are filled with a hot melt connection part.

[0015] Preferably, a pressure ring for pressing the magnet is provided in the installation cavity, and the pressure ring is fixedly connected to the cavity wall of the installation cavity.

[0016] Preferably, the pressure ring and the cavity wall of the installation cavity are provided with external connecting threads and internal connecting threads that cooperate with each other.

[0017] Preferably, the pressure ring is connected to the cavity wall of the installation cavity through a fastener; the fastener is arranged obliquely.

[0018] Preferably, a sealing cover is provided at the bottom of the shell, a heat-conducting copper column is passed through the sealing cover, and a heat-conducting silica gel that fits the circuit board is installed at one end of the heat-conducting copper column away from the sealing cover.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1: In the present invention, a mounting cavity is provided at the end of the rotating shaft, a magnet is provided in the mounting cavity, and a Hall sensor is partially or completely provided in the mounting cavity, which can reduce the axial size of the angular displacement sensor and make the angular displacement sensor more miniaturized.

[0021] 2: In the present invention, a hot melt connection portion is provided for connection while the magnet is bonded, so as to prevent the magnet from falling off after the glue layer fails, thereby improving the service life of the angular displacement potentiometer.

[0022] 3: The utility model is provided with heat-conducting copper columns and heat-conducting silica gel, which improves the heat dissipation rate of the circuit board and increases the service life of the angular displacement potentiometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of the first non-contact angular displacement potentiometer;

[0024] Figure 2 This is a schematic diagram of the structure of the second non-contact angular displacement potentiometer;

[0025] Figure 3 This is a schematic diagram of the structure of the third type of non-contact angular displacement potentiometer. DETAILED DESCRIPTION

[0026] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] A non-contact angular displacement potentiometer, such as Figure 1 As shown, it includes a shell 1, a circuit board 2, a Hall sensor 3, a rotating shaft 4, and a magnet 5. The circuit board 2 is arranged inside the shell 1, and the relatively outer part of the circuit board 2 is connected to the shell 1 by screws. The circuit board 2 is provided with the Hall sensor 3, and the rotating shaft 4 is rotatably arranged on the shell 1 through a bearing 4-1. The rotating shaft 4 has a first end arranged in the shell 1, and the magnet 5 is connected to the first end and is opposite to the Hall sensor 3.

[0029] The axial end face of the first end is provided with a mounting cavity 41, the magnet 5 is fixedly arranged in the mounting cavity 41, and the Hall sensor 3 is partially or completely located in the mounting cavity 41. This arrangement can reduce the axial size of the angular displacement sensor, making the angular displacement sensor more miniaturized.

[0030] The magnet 5 is fixedly disposed in the installation cavity 41 by being fixedly connected to the bottom of the installation cavity 41 . During fixation, the magnet 5 is fixedly connected to the bottom of the installation cavity 41 through the glue layer 5 - 4 .

[0031] like Figure 2 As shown, a hot melt connection hole 1 is provided at the bottom of the mounting cavity 41, and a hot melt connection hole 2 communicating with the hot melt connection hole 1 is provided at the center of the magnet 5. The hot melt connection hole 1 and the hot melt connection hole 2 are filled with a hot melt connection part 6. The hot melt connection part 6 is formed by cooling the hot melt plastic poured into the hot melt connection hole 1 and the hot melt connection hole 2. The hot melt connection part 6 further connects the magnet 5 and the rotating shaft 4 to prevent the magnet 5 from falling off after the glue layer 5-4 fails, thereby improving the service life of the angular displacement potentiometer. At the same time, there are no high requirements for the shape of the hot melt connection hole 2, so there is no great difficulty in opening it on the magnet 5.

[0032] Example 2: Different from Example 1, this example uses a different installation method for the magnet 5. Figure 3As shown, a pressure ring 7 is provided in the installation cavity 41, and the pressure ring 7 and the cavity wall of the installation cavity 41 are provided with external connecting threads and internal connecting threads that cooperate with each other, so that the pressure ring 7 is fixedly connected to the cavity wall of the installation cavity 41. When the pressure ring 7 is fixed, it axially presses the magnet 5 to fix the magnet 5. At the same time, the pressure ring 7 also isolates the Hall sensor 3 and the magnet 5 to prevent them from contacting each other and causing wear. In other embodiments, the pressure ring 7 can also be connected to the cavity wall of the installation cavity 41 by a fastener. The fastener can be a screw. The pressure ring 7 and the cavity wall of the installation cavity 41 are provided with a fastening connection hole for installing the fastener. The fastener is set obliquely, and is on a plane containing the central axis of the pressure ring 7, and has a certain inclination angle with the central axis of the pressure ring 7. Since the pressure ring 7 itself is a dimensional part with limited internal space, it is set to be inclined to facilitate the tightening operation. If it is screwed in along the radial direction of the pressure ring 7, it is not easy to operate.

[0033] Example 3:

[0034] This embodiment is further introduced based on Embodiment 1 and Embodiment 2.

[0035] In this embodiment, a cover 81 is provided at the bottom of the shell 1, and a heat-conducting copper column 82 is penetrated by the cover 81. A heat-conducting silicone rubber 83 that fits the circuit board 2 is installed at the end of the heat-conducting copper column 82 away from the cover 81. The heat generated on the circuit board 2 is transferred to the heat-conducting copper column 82 through the heat-conducting silicone rubber 83 and finally dissipated into the air, thereby realizing the heat dissipation of the circuit board 2 and improving the service life of the angular displacement potentiometer. At the same time, under the elastic action of the heat-conducting silicone rubber 83, its surface can be tightly fitted with the circuit board 2, thereby greatly reducing unevenness and improving the heat dissipation rate of the circuit board.

[0036] The above embodiments are merely descriptions of preferred implementations of the present invention and are not intended to limit the concept and scope of the present invention. Any modifications and improvements to the technical solution of the present invention made by a person of ordinary skill in the art without departing from the design concept of the present invention shall fall within the scope of protection of the present invention. The technical content sought to be protected by the present invention is fully set forth in the claims.

Claims

1. A non-contact angular displacement potentiometer, comprising: a housing (1); a circuit board (2) disposed inside the housing (1), wherein a Hall sensor (3) is provided on the circuit board (2); a rotating shaft (4) rotatably disposed on the housing (1) and having a first end disposed in the housing (1); a magnet (5) connected to the first end and facing the Hall sensor (3); It is characterized by: An axial end surface of the first end is provided with a mounting cavity (41), the magnet (5) is fixedly arranged in the mounting cavity (41), and the Hall sensor (3) is partially or entirely located in the mounting cavity (41).

2. A non-contact angular displacement potentiometer according to claim 1, characterized in that: The magnet (5) is fixedly connected to the bottom of the installation cavity (41).

3. A non-contact angular displacement potentiometer according to claim 2, characterized in that: The magnet (5) is fixedly connected to the bottom of the installation cavity (41) through a glue layer (5-4), and a hot melt connection hole 1 is provided at the bottom of the installation cavity (41), and a hot melt connection hole 2 is provided at the center of the magnet (5) and communicates with the hot melt connection hole 1, and the hot melt connection hole 1 and the hot melt connection hole 2 are filled with a hot melt connection part (6).

4. The non-contact angular displacement potentiometer according to claim 1, characterized in that: A pressing ring (7) for pressing the magnet (5) is provided in the installation cavity (41), and the pressing ring (7) is fixedly connected to the cavity wall of the installation cavity (41).

5. A non-contact angular displacement potentiometer according to claim 4, characterized in that: The pressure ring (7) and the cavity wall of the installation cavity (41) are provided with external connecting threads and internal connecting threads that cooperate with each other.

6. A non-contact angular displacement potentiometer according to claim 4, characterized in that: The pressure ring (7) is connected to the cavity wall of the installation cavity (41) via a fastener; the fastener is arranged obliquely.

7. A non-contact angular displacement potentiometer according to any one of claims 1 to 6, characterized in that: A cover (81) is provided at the bottom of the housing (1), a heat-conducting copper column (82) is provided through the cover (81), and a heat-conducting silica gel (83) is installed at one end of the heat-conducting copper column (82) away from the cover (81) and in contact with the circuit board (2).

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