Angular displacement sensor

Abstract

The utility model provides an angular displacement sensor, and relates to the field of Hall sensors. The angular displacement sensor includes: a housing; the shaft sleeve is rotationally arranged on the shell; the first end of the shaft sleeve extends out of the shell; the second end of the shaft sleeve extends into the shell; the rotating shaft at least comprises a first shaft body and a second shaft body; the first shaft body is inserted into the first end of the shaft sleeve; the second shaft body is inserted into the second end of the shaft sleeve; a magnetic element is arranged on the second shaft body; the signal generation assembly is arranged in the shell; the signal generation assembly at least comprises a Hall element; wherein an electromagnetic shielding layer is arranged in the shell wall of the shell; an electromagnetic shielding piece is arranged in the shaft sleeve and located between the first shaft body and the second shaft body. According to the utility model, external magnetic field shielding can be enhanced, and internal elements are prevented from being interfered.

Description

TECHNICAL FIELD

[0001] The utility model relates to hall sensor field, concretely is a kind of angular displacement sensor. BACKGROUND

[0002] Angular displacement sensor is a type of displacement sensor, with non-contact design, compared with other traditional angular displacement measuring instruments such as synchronous analyzer and potentiometer, effectively improves long-term reliability. Its unique design can still ensure measurement accuracy without using easily worn movable parts such as slip rings, vanes, contact cursors and brushes.

[0003] Hall angular displacement sensor is an angular displacement sensor that detects angular displacement by magnetic field change. The characteristics of Hall angular displacement sensor include high precision, no noise, high sensitivity, high repeatability, high resolution, long service life and high frequency response, and can be applied to various environments to achieve 360° absolute position measurement. Hall angular displacement sensor is widely used in aircraft, automobiles, warships, medical devices and industrial automation. However, in the prior art, Hall sensor is very susceptible to external magnetic field sources, for example, Hall angular displacement sensor on new energy vehicle, which may cause distortion of measured current reading. Although shielding technology and careful positioning can alleviate this limitation, many factors still need to be considered when implementing these sensors in a rich magnetic environment. SUMMARY

[0004] The utility model discloses a kind of angular displacement sensors that can enhance the magnetic field shielding of Hall angular displacement sensor to external, especially in the position of rotating shaft directly contacted with magnetic part, to prevent internal components from being interfered by external magnetic field, to solve the problem that Hall angular displacement sensor is susceptible to external magnetic field sources in prior art, leading to the problem of distortion of measured current reading.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] An angular displacement sensor comprises:

[0007] A housing;

[0008] A shaft sleeve is rotatably arranged on the housing; the first end of the shaft sleeve extends out of the housing; the second end of the shaft sleeve extends into the housing;

[0009] A rotating shaft has at least a first shaft body and a second shaft body; the first shaft body is inserted into the first end of the shaft sleeve; the second shaft body is inserted into the second end of the shaft sleeve; and a magnetic element is arranged on the second shaft body; and

[0010] A signal generating assembly is arranged inside the housing; the signal generating assembly has at least a Hall element;

[0011] The shell wall of the shell is internally provided with an electromagnetic shielding layer; and the shaft sleeve is internally provided with an electromagnetic shielding sheet, which is located between the first shaft body and the second shaft body, thereby enhancing the magnetic field shielding effect outside the shell.

[0012] Further, the shell is internally provided with at least a first chamber and a second chamber; one end of the first chamber is provided with a first mounting hole.

[0013] Further, the shaft sleeve is rotatably arranged in the first mounting hole through a bearing.

[0014] Further, an electromagnetic shielding gasket is embedded between the outer ring and the inner ring of the bearing, and the electromagnetic shielding gasket is arranged on one side of the bearing facing the outside of the shell.

[0015] Further, an insulating spacer sleeve is arranged inside the shell and between the first chamber and the second chamber.

[0016] Further, a mounting groove is arranged on one side of the insulating spacer sleeve inside the second chamber; and the Hall element is arranged in the mounting groove.

[0017] Further, the signal generating assembly further has at least a circuit board, which is arranged in the second chamber; the circuit board is electrically connected with the Hall element; and the circuit board is provided with a plug-in interface.

[0018] Further, a convex rib is arranged on the inner side wall of the shaft sleeve, and a first insertion groove is arranged on the outer side wall of the first shaft body; a second insertion groove is arranged on the outer side wall of the second shaft body; and the convex rib can be inserted into the first insertion groove and the second insertion groove.

[0019] Further, a first annular groove is arranged in the middle part of the first shaft body, and a first limiting ring is embedded in the first annular groove; and a second annular groove is arranged in the middle part of the second shaft body, and a second limiting ring is embedded in the second annular groove.

[0020] Further, a cover body is arranged on one end of the shell close to the signal generating assembly, and a communication hole is arranged on the cover body, which can pass through a connecting line between the signal generating assembly and an external device.

[0021] The utility model discloses the beneficial effect is:

[0022] 1.The utility model discloses a shell is set up, and the shaft sleeve and the rotating shaft of shell are set up and are driven, and the angular displacement signal is generated with the magnet of rotating shaft and the signal generating component in the shell, thereby real -time angular displacement detection is carried out, and the signal generating component in the shell is not interfered by the external magnetic field with the electromagnetic shielding sheet in the shaft sleeve and the electromagnetic shielding layer in the shell wall, the problem that the hall angular displacement sensor is interfered by the external magnetic field source and leads to the current reading distortion of measurement in the prior art is solved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiment of the present application or prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a three-dimensional schematic view of the sensor of the utility model embodiment;

[0025] Figure 2 It is a sectional view of the sensor of the utility model embodiment;

[0026] Figure 3 It is a sectional view of the shell of the utility model embodiment;

[0027] Figure 4 It is a three-dimensional perspective view of the shaft sleeve of the utility model embodiment;

[0028] Figure 5 It is a three-dimensional schematic view of the first shaft body of the utility model embodiment;

[0029] Figure 6 It is a three-dimensional schematic view of the second shaft body of the utility model embodiment;

[0030] Figure 7 It is a sectional view of the heat insulation spacer sleeve of the utility model embodiment;

[0031] Figure 8 It is a three-dimensional schematic view of the circuit board of the utility model embodiment.

[0032] Sign meaning: 100-shell, 101-mounting hole, 110-first chamber, 120-second chamber, 130-bearing, 132-electromagnetic shielding gasket, 140-electromagnetic shielding layer, 150-cover, 152-communication hole;

[0033] 200-shaft sleeve, 210-first pipe section, 220-second pipe section, 222-electromagnetic shielding sheet, 230-convex rib;

[0034] 300 - first shaft body, 310 - first slot, 320 - first annular groove, 330 - first limiting ring;

[0035] 400 - second shaft body, 410 - second slot, 420 - second annular groove, 430 - second limiting ring, 440 - mounting groove, 450 - magnet;

[0036] 500 - insulating spacer sleeve, 510 - mounting groove;

[0037] 600 - Hall element;

[0038] 700 - circuit board, 710 - plug-in interface. DETAILED DESCRIPTION

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0040] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0041] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0042] Example 1

[0043] The application of the existing Hall angular displacement sensor has some limitations, especially the existence of external magnetic field will hinder the accurate operation of the angular displacement sensor measured by the Hall effect. Since the Hall angular displacement sensor is very susceptible to external magnetic field sources, this can cause distortion of the measured current reading. Shielding technology and careful positioning can alleviate this limitation, but these ways need to add more additional components, and it is still difficult to ensure that these sensors can work completely normally in a magnetic environment.

[0044] In order to solve the above problems of the Hall angle displacement sensor in the prior art, the embodiment provides an angle displacement sensor for real-time detection and feedback of angular displacement through the Hall effect. The angle displacement sensor can enhance the magnetic field shielding of the Hall angle displacement sensor to the outside, especially at the position of the rotating shaft directly contacting the magnetic part, thereby preventing the internal elements from being interfered by the external magnetic field. Please refer to Figures 1-8 The angle displacement sensor mainly comprises a shell 100, a shaft sleeve 200 arranged on the shell 100, a signal generating assembly arranged in the shell 100, and a rotating shaft arranged in the shaft sleeve 200, etc.

[0045] The shell 100 is the external protection and shielding structure of the angle displacement sensor of the embodiment. As shown in Figures 1-3 The shell 100 is substantially cylindrical and has an open end, and a first mounting hole 101 is arranged at the center of the other end, and a bearing 130 is embedded in the first mounting hole 101. The inside of the shell 100 is divided into a first chamber 110 and a second chamber 120 along the axial direction, the first chamber 110 is arranged close to the first mounting hole 101 and is mainly used for accommodating the shaft sleeve 200 and the rotating shaft, etc.; and the inner diameter of the second chamber 120 is larger than that of the first chamber 110, and the second chamber 120 is mainly used for accommodating the signal generating assembly, etc. At the same time, an electromagnetic shielding layer 140 for shielding external electromagnetic interference is embedded in the shell wall of the shell 100 of the embodiment. In addition, a detachable cover 150 is arranged on the open end of the shell 100, the diameter of the cover 150 towards the inside of the shell 100 is smaller and is adapted to the inner diameter of the second chamber 120 of the shell 100 for being inserted into the inside of the second chamber 120; and the diameter of the cover 150 towards the outside of the shell 100 is larger for closing the inner cavity of the shell 100.

[0046] The shaft sleeve 200 is used for connecting the rotating shaft and the shell 100, and plays a protective role for the rotating shaft while maintaining its stability. The shaft sleeve 200 is embedded in the inner ring of the bearing 130, and is arranged on the shell 100 through the bearing 130. In the embodiment, the shaft sleeve 200 is substantially cylindrical and tubular, and the shaft sleeve 200 comprises a first pipe segment 210 and a second pipe segment 220. The second pipe segment 220 is inserted into the inner ring of the bearing 130; the outer diameter of the first pipe segment 210 is larger than that of the second pipe segment 220, and the first pipe segment 210 extends to the outside of the shell 100. At the same time, the inner diameters of the first pipe segment 210 and the second pipe segment 220 are the same, and two convex ribs 230 are arranged on the inner side walls of the first pipe segment 210 and the second pipe segment 220, the two convex ribs 230 are arranged at opposite positions on the inner side walls and extend along the axial direction of the shaft sleeve 200, and are used for clamping the outside of the rotating shaft to relatively fix the rotating shaft and the shaft sleeve 200. In addition, an electromagnetic shielding sheet 222 is embedded in the second pipe segment 220 for blocking the external magnetic field and preventing it from affecting the work of the internal signal generating assembly.

[0047] The rotating shaft is used to transmit the angular displacement of the detection object outside the shell 100, and the change of the angular displacement is reflected on the magnetic element. In the embodiment, the rotating shaft includes a first shaft body 300 and a second shaft body 400. The first shaft body 300 is inserted into the first pipe segment 210 arranged at the first end of the shaft sleeve 200, and the end of the first shaft body 300 outside the shaft sleeve 200 is used to connect the external detection object. The outer side wall of the section of the first shaft body 300 inside the shaft sleeve 200 is provided with two first insertion grooves 310, and the two first insertion grooves 310 are arranged on the opposite sides of the outer side wall of the first shaft body 300 in the axial direction of the first shaft body 300. The first insertion grooves 310 are matched with the convex ribs 230 on the inner wall of the shaft sleeve 200 and are used to insert the convex ribs 230. The middle part of the first shaft body 300 is further provided with a first annular groove 320, and the first annular groove 320 is embedded with a first limiting ring 330. The first limiting ring 330 is used to fix the position of the first shaft body 300 and prevent it from being pulled out of the first pipe segment 210. Meanwhile, the second shaft body 400 is inserted into the first pipe segment 210 arranged at the first end of the shaft sleeve 200, and the outer side wall of the section of the second shaft body 400 inside the shaft sleeve 200 is provided with two second insertion grooves 410. The two second insertion grooves 410 are arranged on the opposite sides of the outer side wall of the second shaft body 400 in the axial direction of the second shaft body 400. The second insertion grooves 410 are matched with the convex ribs 230 on the inner wall of the shaft sleeve 200 and are used to insert the convex ribs 230. The middle part of the second shaft body 400 is further provided with a second annular groove 420, and the second annular groove 420 is embedded with a second limiting ring 430. The second limiting ring 430 is used to fix the position of the second shaft body 400 and prevent it from being pulled out of the second pipe segment 220. In addition, the end of the second shaft body 400 outside the shaft sleeve 200 is provided with a mounting groove 440, which is substantially a flat cylindrical barrel. A magnet 450 is embedded in the mounting groove 440.

[0048] The signal generating assembly is used to convert the angle change of the detection object fed back by the rotating shaft into an electrical signal output. In the embodiment, the signal generating assembly mainly comprises an insulating spacer 500, a Hall element 600 and a circuit board 700 arranged inside the shell. The insulating spacer 500 is substantially circular in cross section and is divided into two layers with different diameters. The smaller diameter part is adapted to the first chamber 110 of the shell 100 and is embedded in the first chamber 110. The larger diameter part is adapted to the second chamber 120 of the shell 100 and is embedded in the second chamber 120. Thus, the insulating spacer 500 separates the first chamber 110 and the second chamber 120 in the shell 100 and electrically shields them from each other, but the magnetic field can pass through the insulating spacer 500 to interact with each other, thereby preventing the Hall element 600 and the circuit board 700 from being affected by current interference from other parts and affecting the operation of the sensor. Meanwhile, a mounting groove 510 is arranged on one side of the larger diameter part of the insulating spacer 500. The Hall element 600 is arranged in the mounting groove 510. The Hall element 600 can detect the angular displacement change of the magnet 450 on the other side of the insulating spacer 500 and generate a corresponding current signal. The circuit board 700 is embedded in the first chamber 110 and is electrically connected to the Hall element 600. The circuit board 700 can process the current signal generated by the Hall element 600 to generate an angular displacement signal. The angular displacement signal is output to an external device through the plug-in interface 710 arranged on the circuit board 700 and electrically connected to the external device.

[0049] A specific working mode of the embodiment is as follows:

[0050] First, the angular displacement sensor of the embodiment is installed at the position to be detected. The first shaft body 300 is connected to the detection object at the end outside the shaft sleeve 200 to prepare for transmission detection. Then, the plug-in interface 710 on the circuit board 700 is electrically connected to the external device through a line, and the sensor starts to work. Then, when the detection object has an angular displacement during the working process, the first shaft body 300 rotates synchronously, and the magnet 450 on the second shaft body 400 is driven to rotate by the shaft sleeve 200. The rotation of the magnet 450 causes a change in the magnetic field, which acts on the Hall element 600 of the signal generating assembly to generate a corresponding current signal. The angular displacement signal is output to the outside after being processed by the signal generating assembly, thereby completing the real-time and rapid detection of the angular displacement.

[0051] In the embodiment, the angular displacement sensor is driven by the shell 100, the shaft sleeve 200 and the rotating shaft, the magnet 450 on the rotating shaft cooperates with the signal generating assembly inside the shell 100 to generate an angular displacement signal, thereby real-time angular displacement detection is realized; and the electromagnetic shielding sheet 222 arranged in the shaft sleeve and the electromagnetic shielding layer 140 arranged inside the shell wall of the shell 100 are relied on to realize that the signal generating assembly inside the shell 100 is free from external magnetic field interference, the problem that the Hall angular displacement sensor in the prior art is easily interfered by external magnetic field source and leads to the current reading distortion in measurement is solved.

[0052] In the embodiment, a plurality of communication holes 152 are formed on the cover 150, the communication holes 152 are used for the power connection line to pass through, and the plug interface 710 on the circuit board 700 of the signal generating assembly and the external equipment are connected; and the inner side of the cover 150 can abut on the circuit board 700 at the position close to the edge, thereby the circuit board is fixed. Meanwhile, the electromagnetic shielding gasket 132 is embedded between the outer ring and the inner ring of the bearing 130, the electromagnetic shielding gasket 132 is arranged on the side of the bearing 130 facing the outside of the shell 100, and is used for further blocking the external electromagnetic interference.

[0053] The basic principle, main features and advantages of the utility model are shown and described above. The skilled in the art should understand that the utility model is not limited by the above-mentioned embodiments, the above-mentioned embodiments and the description in the specification are only preferred examples of the utility model, and are not used to limit the utility model, on the premise of not departing from the spirit and range of the utility model, the utility model will have various changes and improvements, and these changes and improvements all fall into the range of the utility model to be protected. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. An angular displacement sensor, characterized by The shell (100) comprises: a shaft sleeve (200) rotatably arranged on the shell (100), a first end of the shaft sleeve (200) extending out of the shell (100), and a second end of the shaft sleeve (200) extending into the shell (100); a rotating shaft having at least a first shaft body (300) and a second shaft body (400), the first shaft body (300) being inserted into the first end of the shaft sleeve (200), the second shaft body (400) being inserted into the second end of the shaft sleeve (200), and a magnetic element being arranged on the second shaft body (400); and a signal generating assembly arranged in the shell (100), the signal generating assembly having at least a Hall element (600). The shell (100) is internally provided with an electromagnetic shielding layer (140), and the shaft sleeve (200) is internally provided with an electromagnetic shielding sheet (222) located between the first shaft body (300) and the second shaft body (400), thereby enhancing the magnetic field shielding effect outside the shell (100). The shell (100) has at least a first chamber (110) and a second chamber (120), and the first chamber (110) is provided with a first mounting hole (101) at one end.

2. The angular displacement sensor of claim 1, wherein, The shaft sleeve (200) is rotatably arranged in the first mounting hole (101) through a bearing (130).

3. The angular displacement sensor of claim 2, wherein, An electromagnetic shielding gasket (132) is arranged between the outer ring and the inner ring of the bearing (130) and on the side of the bearing (130) facing the outside of the shell (100).

4. The angular displacement sensor of claim 3, wherein, An insulating spacer sleeve (500) is arranged inside the shell (100) and between the first chamber (110) and the second chamber (120).

5. The angular displacement sensor of claim 2, wherein, A mounting groove (510) is arranged on the side of the insulating spacer sleeve (500) inside the second chamber (120), and the Hall element (600) is arranged in the mounting groove (510).

6. The angular displacement sensor of claim 5, wherein, The signal generating assembly further has at least a circuit board (700) arranged in the second chamber (120), the circuit board (700) being electrically connected with the Hall element (600), and the circuit board (700) being provided with a plug-in port (710).

7. The angular displacement sensor of claim 2, wherein, A convex rib (230) is arranged on the inner side wall of the shaft sleeve (200), a first insertion groove (310) is arranged on the outer side wall of the first shaft body (300), and a second insertion groove (410) is arranged on the outer side wall of the second shaft body (400), the convex rib (230) being capable of being inserted into the first insertion groove (310) and the second insertion groove (410).

8. An angular displacement sensor according to any one of claims 1 to 7, wherein, A first annular groove (320) is arranged in the middle of the first shaft body (300), and a first limiting ring (330) is arranged in the first annular groove (320); a second annular groove (420) is arranged in the middle of the second shaft body (400), and a second limiting ring (430) is arranged in the second annular groove (420).

9. An angular displacement sensor according to any one of claims 1 to 7, wherein, ​ 10. The angular displacement sensor of any one of claims 1-7, wherein, The shell (100) is provided with a cover (150) on one end close to the signal generating assembly, the cover (150) is provided with a communication hole (152), the communication hole (152) can pass the connecting line between the signal generating assembly and external equipment.

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