angular displacement sensor

Abstract

The utility model discloses an angle displacement sensor, include: upper end cover, pivot, rotor core, have stator core of winding, bearing and shell, the pivot is rotatablely connected with shell through bearing, the open end of shell is closed through upper end cover, the center of upper end cover is equipped with the through -hole of the pivot wear, the inside of shell is connected with stator core, the rotor core is set up in the pivot outside, with stator core position corresponds, the convex pole magnetoresistance surface central angle of rotor core is 180 DEG. Increase the range of angle displacement sensor.

Description

Technical Field

[0001] This utility model relates to the field of sensors, and in particular to an angular displacement sensor. Background Technology

[0002] RVDT angular displacement sensors are widely used as mechanical angle measuring elements in industries such as aviation, electronics, machinery, textiles, shipbuilding, and metallurgy, and are also extensively used as sensors in servo motors. RVDT angular displacement sensors mainly consist of two parts: a stator assembly and a rotor assembly. Four oblong slots are formed within the stator assembly laminations, and excitation coils and induction coils are wound in these slots in a specific manner.

[0003] Currently, the measurement range of commonly available RVDT angular displacement sensors on the market is generally around ±40°, which cannot meet the working requirements for measuring larger angular displacements.

[0004] There is currently no effective solution to the above problems in existing technologies. Utility Model Content

[0005] To address the aforementioned issues, this invention provides an angular displacement sensor. By designing the circular angle of the salient pole magnetic surface of the rotor core to be 180 degrees, the range of the angular displacement sensor is increased, thereby solving the problem of low measurement range in existing angular displacement sensors.

[0006] To achieve the above objectives, this utility model provides an angular displacement sensor, comprising: an upper cover, a rotating shaft, a rotor core, a stator core with windings, a bearing, and a housing; the rotating shaft is rotatably connected to the housing via the bearing; the open end of the housing is closed by the upper cover, and the center of the upper cover has a through hole for the rotating shaft to pass through; the interior of the housing is connected to the stator core; the rotor core is sleeved on the outside of the rotating shaft, corresponding to the position of the stator core, and the central angle of the salient pole magnetic surface of the rotor core is 180°.

[0007] Alternatively, the stator core may be provided with four waist-shaped slots, in which excitation windings and induction windings are wound respectively.

[0008] Optionally, the excitation winding and the induction winding are wound in an orthogonal symmetrical manner in the waist-shaped slot of the stator core.

[0009] Alternatively, the shaft is rotatably connected to the housing via a bearing, and one end of the shaft is fixed to the center of the rotor core.

[0010] Alternatively, the upper cover may be fixed to the outer casing by screws or clips.

[0011] Optionally, a uniform air gap is formed between the salient pole magnetic surface of the rotor core and the winding of the stator core, with a width of 0.1-0.5 mm.

[0012] Alternatively, the bearing may be an angular contact ball bearing or a deep groove ball bearing, and a dustproof seal ring may be provided between the outer ring of the bearing and the housing.

[0013] Optionally, the end of the rotating shaft is provided with a flange for connecting an external device under test.

[0014] Alternatively, the stator core is made of laminated silicon steel sheets and coated with an insulating layer.

[0015] Alternatively, the rotor core is made of a high-permeability soft magnetic alloy, and its salient pole magnetic surface is polished.

[0016] The above technical solution has the following beneficial effects: by designing the central angle of the salient pole magnetic surface of the rotor core to be 180°, the magnetic field coverage range is effectively expanded, the magnetic saturation phenomenon at large angles is avoided, and the measurement range of the sensor is increased from the traditional ±40° to ±80°, which meets the large angle detection requirements of scenarios such as aviation servos and heavy machinery. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the angular displacement sensor provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic diagram of the rotor core provided in an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the stator core provided in an embodiment of the present invention.

[0021] Reference numerals in the attached diagram: 1-Upper end cover; 2-Shaft; 3-Rotor core; 301-Sagittal pole magnetic surface; 4-Stator core; 5-Bearing; 6-Outer shell. Detailed Implementation

[0022] 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.

[0023] To address the problem of insufficient angular displacement sensing range in existing technologies, this utility model provides an angular displacement sensor. Please refer to [link to relevant documentation]. Figures 1-3 , Figure 1 This is a schematic diagram of the structure of the angular displacement sensor provided in this embodiment of the utility model; Figure 2 This is a schematic diagram of the rotor core provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the stator core provided in an embodiment of the present invention.

[0024] The angular displacement sensor includes: an upper cover 1, a rotating shaft 2, a rotor core 3, a stator core 4 with windings, a bearing 5, and a housing 6; the rotating shaft 2 is rotatably connected to the housing 6 via the bearing 5; the open end of the housing 6 is closed by the upper cover 1, and the center of the upper cover 1 has a through hole for the rotating shaft 2 to pass through; the interior of the housing 6 is connected to the stator core 4; the rotor core 3 is sleeved on the outside of the rotating shaft 2, corresponding to the position of the stator core 4, and the central angle of the salient pole magnetic surface 301 of the rotor core 3 is 180°.

[0025] The sensor housing 6 is hollow, and a rotating shaft 2 is provided inside. The rotating shaft 2 is rotatably connected to the housing 6 near the bottom via a bearing 5. The top port of the housing 6 is connected to an upper end cover 1. The rotating shaft 2 protrudes from the middle of the upper end cover 1, and a bearing 5 is also provided between the rotating shaft 2 and the upper end cover 1.

[0026] The stator core 4 is located on the inner wall of the outer casing 6, and the rotor core 3 is sleeved on the outer side of the rotating shaft 2. The rotor core 3 is arranged correspondingly to the stator core 4, and the rotor core 3 can rotate relative to the stator core 4.

[0027] The salient pole magnetic surface 301 of the rotor core 3 has a central angle of 180°, which optimizes the uniformity of the magnetic field distribution and avoids magnetic saturation at large angles. This design extends the effective measurement range of the sensor to ±80° without changing the stator size, while maintaining high linearity and a compact structure.

[0028] As an optional implementation, the stator core 4 is provided with four waist-shaped slots, in which excitation windings and induction windings are wound respectively.

[0029] Four slots are evenly distributed in the stator core 4, providing fixed space for the windings and ensuring uniform magnetic field distribution. Excitation windings and induction windings are wound in the slots in a certain manner. The excitation winding generates an alternating magnetic field after AC current is applied, serving as the magnetic field excitation source. The induction winding detects the changes in the magnetic field caused by the rotation of the rotor core 3 and outputs an electrical signal proportional to the angular displacement.

[0030] As an optional implementation, the excitation winding and the induction winding are wound in an orthogonal symmetrical manner in the waist-shaped slot of the stator core 4.

[0031] The two windings are spatially orthogonal at 90° to eliminate magnetic field coupling interference and improve signal linearity. Symmetrical winding ensures uniform magnetic field variation at different angles, reducing nonlinear errors in the output signal.

[0032] As an optional implementation, the rotating shaft 2 is rotatably connected to the housing 6 via the bearing 5, and one end of the rotating shaft 2 is fixed to the center of the rotor core 3.

[0033] Synchronous rotation of the shaft 2 and rotor core 3 is achieved through keyways or welding, ensuring accurate angle transmission. The bearing 5 reduces the frictional resistance between the shaft 2 and the housing 6, improving rotational flexibility and sensor lifespan.

[0034] As an optional implementation, the upper cover 1 and the outer casing 6 are fixed together by screws or clips.

[0035] Screws or clips facilitate sensor disassembly and maintenance, such as replacing bearing 5 or cleaning internal components. The securing method ensures a tight seal on the housing 6, preventing dust or liquid from entering the delicate internal structure.

[0036] As an optional implementation, a uniform air gap is formed between the salient pole magnetic surface 301 of the rotor core 3 and the winding of the stator core 4, with the air gap width being 0.1-0.5mm.

[0037] A width of 0.1-0.5mm balances magnetic field strength and mechanical tolerance. Too small a width can easily lead to friction, while too large a width can reduce sensitivity. A uniform air gap can optimize the magnetic circuit closure, reduce magnetic leakage, and improve magnetic field efficiency.

[0038] As an optional implementation, the bearing 5 is an angular contact ball bearing 5 or a deep groove ball bearing 5, and a dustproof seal ring is provided between the outer ring of the bearing 5 and the housing 6.

[0039] Angular contact ball bearing 5 is suitable for high axial load applications (such as frequent start-stop cycles); deep groove ball bearing 5 is suitable for applications with predominantly radial loads and low noise requirements. Dust seals prevent external particles from entering the bearing 5, extending its service life and reducing maintenance frequency.

[0040] As an optional implementation, the end of the rotating shaft 2 is provided with a flange for connecting an external device under test.

[0041] The flange provides standardized interfaces (such as bolt holes or keyways) to quickly adapt to different mechanical structures (such as servos and robotic arms), thereby simplifying the docking process between sensors and the device under test and improving system integration efficiency.

[0042] As an optional implementation, the stator core 4 is made of laminated silicon steel sheets and coated with an insulating layer.

[0043] Silicon steel sheets have the advantages of high magnetic permeability, low coercivity, and reduced eddy current losses, which can improve the magnetic field response speed; the insulation layer can prevent short circuits between laminations, reduce the temperature rise of the iron core, and ensure long-term stable operation.

[0044] As an optional implementation, the rotor core 3 is made of a high-permeability soft magnetic alloy, and its salient pole magnetic surface 301 is polished.

[0045] High-permeability materials can optimize magnetic circuit closure efficiency, enhance magnetic field strength, and improve signal output sensitivity. Surface polishing can reduce magnetic pole surface roughness, decrease air gap magnetic reluctance, and further improve measurement accuracy.

[0046] The above technical solution has the following beneficial effects: by designing the central angle of the salient pole magnetic surface of the rotor core to be 180°, the magnetic field coverage range is effectively expanded, the magnetic saturation phenomenon at large angles is avoided, and the measurement range of the sensor is increased from the traditional ±40° to ±80°, which meets the large angle detection requirements of scenarios such as aviation servos and heavy machinery.

[0047] The above-described specific embodiments of the utility model further illustrate the purpose, technical solution, and beneficial effects of the utility model. It should be understood that the above content is only a specific embodiment of the utility model and is not intended to limit the scope of protection of the utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the utility model should be included within the scope of protection of the utility model.

Claims

1. An angular displacement sensor, characterized in that The application relates to an angle displacement sensor. The upper end cover, the rotating shaft, the rotor core, the stator core with windings, the bearing and the shell are connected rotatably through the bearing. The opening end of the shell is closed by the upper end cover, and the center of the upper end cover is provided with a through hole for the rotating shaft to pass out. The inside of the shell is connected with the stator core. The rotor core is sleeved outside the rotating shaft and corresponds to the stator core in position, and the convex pole magnetic conduction surface of the rotor core has a central angle of 180 degrees.

2. The angle displacement sensor according to claim 1, wherein four waist-shaped grooves are arranged on the stator core, and excitation windings and induction windings are respectively wound in the waist-shaped grooves.

3. The angle displacement sensor according to claim 2, wherein the excitation windings and the induction windings are wound in the waist-shaped grooves of the stator core in a quadrature symmetry mode.

4. The angle displacement sensor according to claim 1, wherein the rotor core rotates synchronously with the rotating shaft.

5. The angle displacement sensor according to claim 1, wherein the upper end cover and the shell are fixed through screws or buckles.

6. The angle displacement sensor according to claim 1, wherein the convex pole magnetic conduction surface of the rotor core and the windings of the stator core form a uniform air gap with a width of 0.1-0.5 mm.

7. The angle displacement sensor according to claim 1, wherein the bearing is an angular contact ball bearing or a deep groove ball bearing, and a dustproof sealing ring is arranged between the bearing outer ring and the shell.

8. The angle displacement sensor according to claim 1, wherein the end of the rotating shaft is provided with a flange plate for connecting an external measured device.

9. The angle displacement sensor according to claim 1, wherein the stator core is made of silicon steel sheets and is coated with an insulating layer.

10. The angle displacement sensor according to claim 1, wherein the rotor core is made of high-permeability soft magnetic alloy, and the surface of the convex pole magnetic conduction surface is polished. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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