Angular displacement sensor

Abstract

The embodiment of the invention discloses an angular displacement sensor, which comprises an upper end cover, a rotating shaft, a rotor core, a stator core with a winding, a bearing and a shell, the rotating shaft is rotatably connected with the shell through a bearing; the open end of the shell is sealed through an upper end cover, and a through hole for the rotating shaft to penetrate out is formed in the center of the upper end cover. The interior of the shell is connected with the stator core; the rotor iron core is sleeved on the outer side of the rotating shaft and corresponds to the stator iron core in position, and the central angle of the salient pole magnetic conductive surface of the rotor iron core is 180 degrees. The range of the angular displacement sensor is increased.

Description

Technical Field

[0001] The present invention relates to the field of sensors, and in particular to an angular displacement sensor. Background Art

[0002] RVDT angular displacement sensors, as mechanical angle measurement components, are widely used in industries such as aviation, electronics, machinery, textiles, shipbuilding, and metallurgy, and are widely used as sensors in steering gears. RVDT angular displacement sensors primarily consist of a stator assembly and a rotor assembly. Four waist-shaped slots are defined within the stator laminations, within which the excitation and induction coils are wound in a specific pattern.

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

[0004] There is currently no effective solution to the above problems in the prior art. Summary of the Invention

[0005] To solve the above problems, the present invention provides an angular displacement sensor. By designing the circular angle of the salient pole magnetic conductive surface of the rotor core to be 180 degrees, the range of the angular displacement sensor is increased to solve the problem of low measurement range of the angular displacement sensor in the prior art.

[0006] To achieve the above objectives, the present invention provides an angular displacement sensor comprising: an upper end cover, a rotating shaft, a rotor core, a stator core with a winding, 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 end cover, and a through hole is provided in the center of the upper end cover 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 conductive surface of the rotor core is 180°.

[0007] Further optionally, the stator core is provided with four waist-shaped slots, in which the excitation winding and the induction winding are respectively wound.

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

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

[0010] Further optionally, the upper end cover and the outer shell are fixed by screws or buckles.

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

[0012] Further optionally, the bearing is an angular contact ball bearing or a deep groove ball bearing, and a dustproof sealing ring is provided between the outer ring of the bearing and the housing.

[0013] Further optionally, a flange is provided at the end of the rotating shaft for connecting to an external device under test.

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

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

[0016] The above technical solution has the following beneficial effects: by designing the central angle of the salient pole magnetic conductive surface of the rotor core to 180°, the magnetic field coverage range is effectively expanded, magnetic saturation at large angles is avoided, and the measurement range of the sensor is increased from the traditional ±40° to ±80°, meeting the large-angle detection needs of scenarios such as aviation servos and heavy machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 1 is a schematic structural diagram of an angular displacement sensor provided by an embodiment of the present invention;

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

[0020] Figure 3 It is a schematic structural diagram of a stator core provided by an embodiment of the present invention.

[0021] Reference numerals: 1 - upper end cover; 2 - rotating shaft; 3 - rotor core; 301 - salient pole magnetic conductive surface; 4 - stator core; 5 - bearing; 6 - housing. DETAILED DESCRIPTION

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] In order to solve the problem of insufficient angular displacement sensor range in the prior art, the present invention provides an angular displacement sensor. Figure 1-Figure 3 , Figure 1 1 is a schematic structural diagram of an angular displacement sensor provided by an embodiment of the present invention; Figure 2 is a schematic structural diagram of a rotor core provided by an embodiment of the present invention; Figure 3 It is a schematic structural diagram of a stator core provided by an embodiment of the present invention.

[0024] The angular displacement sensor includes: an upper end cover 1, a rotating shaft 2, a rotor core 3, a stator core 4 with a winding, 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 end cover 1, and a through hole is provided in the center of the upper end cover 1 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 conductive surface 301 of the rotor core 3 is 180°.

[0025] The sensor's housing 6 is hollow and contains a rotating shaft 2, which is rotatably connected to the housing 6 at its bottom via a bearing 5. The top end of the housing 6 is connected to an upper end cap 1, from which the rotating shaft 2 protrudes. A bearing 5 is also provided between the rotating shaft 2 and the upper end cap 1.

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

[0027] The central angle of the salient pole magnetic surface 301 of the rotor core 3 is 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 compact structure.

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

[0029] Four waist-shaped slots are evenly distributed throughout the stator core 4, providing space for the windings and ensuring uniform magnetic field distribution. The excitation winding and induction winding are wound in a specific pattern within the waist-shaped slots. The excitation winding generates an alternating magnetic field when AC current is applied, serving as the magnetic field excitation source. The induction winding detects 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 the waist-shaped slots of the stator core 4 in an orthogonal symmetrical manner.

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

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

[0033] Keyways or welding allow the shaft 2 and rotor core 3 to rotate synchronously, ensuring accurate angle transmission. Bearings 5 reduce friction between the shaft 2 and housing 6, improving rotational flexibility and sensor life.

[0034] As an optional implementation, the upper end cover 1 and the outer shell 6 are fixed by screws or buckles.

[0035] The screw or clip fastening facilitates sensor disassembly and maintenance, such as replacing bearings 5 or cleaning internal components. The fastening method ensures that the housing 6 is tightly sealed, preventing dust or liquid from invading the delicate internal structure.

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

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

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

[0039] Angular contact ball bearings are suitable for high axial loads (such as frequent starts and stops), while deep groove ball bearings are suitable for applications with primarily radial loads and low noise requirements. Dust seals prevent foreign particles from entering the bearings, extending their service life and reducing maintenance frequency.

[0040] As an optional implementation, a flange is provided at the end of the rotating shaft 2 for connecting to 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 the sensor and the device under test and improving system integration efficiency.

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

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

[0044] As an optional embodiment, the rotor core 3 is made of a high-permeability soft magnetic alloy, and the surface of the salient pole magnetic conductive surface 301 thereof 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 pole surface roughness, reduce air gap 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 conductive surface of the rotor core to 180°, the magnetic field coverage range is effectively expanded, magnetic saturation at large angles is avoided, and the measurement range of the sensor is increased from the traditional ±40° to ±80°, meeting the large-angle detection needs of scenarios such as aviation servos and heavy machinery.

[0047] The specific implementation methods of the above inventions further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above content is only the specific implementation methods of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An angular displacement sensor, characterized in that: include: Upper end cover, rotating shaft, rotor core, stator core with winding, bearings and housing; The rotating shaft is rotatably connected to the housing via a bearing; The open end of the housing is closed by an upper end cover, and a through hole is provided in the center of the upper end cover for the 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 and corresponds to the position of the stator core. The central angle of the salient pole magnetic conductive surface of the rotor core is 180°.

2. The angular displacement sensor according to claim 1, wherein: The stator core is provided with four waist-shaped slots, in which the excitation winding and the induction winding are respectively wound.

3. The angular displacement sensor according to claim 2, wherein: The excitation winding and the induction winding are wound in the waist-shaped slots of the stator core in an orthogonal symmetrical manner.

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

5. The angular displacement sensor according to claim 1, wherein: The upper end cover is fixed to the outer shell by screws or buckles.

6. The angular displacement sensor according to claim 1, wherein: A uniform air gap is formed between the salient pole magnetic conductive surface of the rotor core and the winding of the stator core, and the width of the air gap is 0.1-0.5 mm.

7. The angular 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 provided between the outer ring of the bearing and the housing.

8. The angular displacement sensor according to claim 1, wherein: The end of the rotating shaft is provided with a flange for connecting to an external device under test.

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

10. The angular displacement sensor according to claim 1, wherein: The rotor core is made of a high-permeability soft magnetic alloy, and the surface of the salient pole magnetic conductive surface is polished.

Images