CN112687460B - RVDT angular displacement sensor with adjustable sensitivity - Google Patents
RVDT angular displacement sensor with adjustable sensitivity Download PDFInfo
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- CN112687460B CN112687460B CN202011520780.4A CN202011520780A CN112687460B CN 112687460 B CN112687460 B CN 112687460B CN 202011520780 A CN202011520780 A CN 202011520780A CN 112687460 B CN112687460 B CN 112687460B
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Abstract
The invention provides a sensitivity-adjustable RVDT angular displacement sensor, which comprises a rotating shaft and a rotating shaft sleeve, wherein a rotor lamination is fixedly arranged on the rotating shaft, and a stator winding and an excitation winding are fixedly arranged on the outer wall of the rotating shaft sleeve at positions corresponding to the rotor lamination; the magnetic flux collecting sleeve assembly comprises an outer sleeve and a magnetic flux collecting inner sleeve which are fixed with each other, and the outer sleeve is in threaded connection with the outer wall of the rotating shaft sleeve, so that the magnetic flux collecting sleeve assembly can axially move on the rotating shaft sleeve. The invention can realize the adjustment of the output sensitivity of the RVDT angular displacement sensor, and solves the problems of inconsistent sensitivity of the RVDT angular displacement sensor and difficult assembly adjustment process, inconsistent batch performance, poor manufacturability and low production efficiency caused by the traditional structure.
Description
Technical Field
The disclosure relates to the technical field of rotary transformers, in particular to a sensitivity-adjustable RVDT angular displacement sensor.
Background
Rvdt (rotary Variable Differential transducer) angular displacement sensors measure mainly the angle of rotation. The method has the advantages of high precision, good linearity, good repeatability and the like, and is widely applied to the military and civil fields of aviation, aerospace, robot systems, mechanical tools and the like.
The traditional RVDT angular displacement sensor realizes displacement signal transmission by adopting a brush, a slip ring and the like, and the service life and the reliability of the sensor are limited due to sliding contact. In addition, contact-type rotary transformers generate noise and are not suitable for applications that are sensitive to noise. After the new technology of contactless measurement of rotation of a rotating shaft, the technology of contact measurement such as an electric brush and a slip ring is gradually replaced. The reliability and the service life of the RVDT angular displacement sensor with the rotating shaft are improved by times.
In addition, the existing non-contact RVDT angular displacement sensor has single sensitivity after assembly is completed, and the output sensitivities of a plurality of sensors with the same specification at key measuring points are different, so that sensitivity parameters need to be adjusted again after a product is replaced. Aiming at the problem of inconsistent sensitivity of the conventional RVDT angular displacement sensor, the prior art mainly adopts a plurality of stators to test and select the stator with the same performance to assemble or replace the stator with the same performance and then readjust the sensitivity parameter. The methods have high manufacturing cost and low working efficiency.
Disclosure of Invention
Based on the RVDT angular displacement sensor with adjustable sensitivity, the problems that the RVDT angular displacement sensor is inconsistent in sensitivity and the problems that the assembly and adjustment process is difficult, the batch performance is inconsistent, the manufacturability is poor and the production efficiency is low due to the traditional structure can be solved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an RVDT angular displacement sensor with adjustable sensitivity comprises a rotating shaft of the RVDT angular displacement sensor and a rotating shaft sleeve sleeved outside the rotating shaft, wherein a rotor lamination is fixedly arranged on the rotating shaft, and a stator winding and an excitation winding are fixedly arranged on the outer wall of the rotating shaft sleeve corresponding to the position of the rotor lamination; still establish including the cover gather the magnetism sleeve subassembly outside stator winding and the excitation winding, gather the magnetism sleeve subassembly and include the outer sleeve of mutual fixation and gather the magnetism inner skleeve, the outer sleeve with pivot sleeve outer wall threaded connection makes gather the magnetism sleeve subassembly and can axial displacement on the pivot sleeve.
In a preferred embodiment, the device further comprises a bearing arranged on the rotating shaft, an inner ring of the bearing is fixedly connected with the rotating shaft, and an outer ring of the bearing is fixedly connected with the inner wall of the rotating shaft sleeve.
In a preferred embodiment, the bearings are arranged at two ends of the rotating shaft at two sides of the magnetic gathering sleeve assembly.
In a preferred embodiment, the magnetic gathering sleeve assembly is arranged in the inner cavity of the protective shell.
In a preferred embodiment, the protective shell is made of soft magnetic material and is used for shielding interference of an external magnetic field on the RVDT angular displacement sensor.
In a preferred embodiment, one end of the protective shell is provided with a top cover, and the other end of the protective shell is provided with a bottom cover for sealing the interior of the protective shell.
In a preferred embodiment, the bottom cover is fixedly connected with the rotating shaft sleeve, and the bottom cover is provided with a convex handheld part.
In a preferred embodiment, the material of the stator laminations and the rotor laminations in the stator winding is a soft magnetic alloy material with low magnetic hysteresis.
The RVDT angular displacement sensor with adjustable sensitivity has the beneficial effects that:
(1) compared with the prior RVDT angular displacement sensor stator with relatively fixed performance, the invention adjusts the magnetic field acting on the stator winding 5 through the magnetic gathering sleeve component 8, thereby adjusting the output voltage of the output winding and realizing the adjustment of the output sensitivity of the RVDT angular displacement sensor.
(2) The sensitivity of the formed RVDT angular displacement sensor is inconsistent and can not be adjusted at present, but the sensitivity of the RVDT angular displacement sensor provided by the invention can be flexibly set according to the requirement, a complex debugging process is not needed, the cost can be saved to the greatest extent, and the production efficiency is improved.
(3) The invention can adjust the sensitivity in the shell of the molded product on line. Compared with the prior art and the mode of replacing the stator or the rotor for adjusting the performance, the adjusting method has the advantages of realizing on-line adjustment sensitivity and greatly improving the product percent of pass.
(4) In the prior art, the stator winding 5 is repeatedly pulled out through ceaselessly replacing internal parts of a product, so that a fit clearance is easily caused, coaxiality errors are caused, and the product is scrapped. The invention does not need complex assembling and debugging processes, adjusts the position of the magnetism-gathering sleeve assembly 8, easily achieves the sensitivity meeting the requirement and has stronger manufacturability.
(5) At present, the performance of a plurality of sensors for monitoring the same angle on the sensors is high, sensors with consistent performance are selected from batch products at present, or redundancy RVDT angular displacement sensors are adopted, and a large amount of time, labor and material cost are spent.
(6) The invention has stronger adaptability and universality, and meets the requirement of the market on the sensitivity of the RVDT angular displacement sensor in various occasions.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of an RVDT angular displacement sensor with adjustable sensitivity according to the present invention;
FIG. 2 is an equivalent circuit diagram of an RVDT angular displacement sensor with adjustable sensitivity according to the present invention;
FIG. 3 is a graph of the output curves VA and VB of the output coils of the RVDT angular displacement sensor with adjustable sensitivity of the invention;
fig. 4 is a graph of the differential output voltage of an RVDT angular displacement sensor with adjustable sensitivity according to the present invention.
Detailed Description
The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.
The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
It is noted that various aspects of the embodiments are described below within the scope of the appended claims. It should be apparent that the aspects described herein may be embodied in a wide variety of forms and that any specific structure and/or function described herein is merely illustrative. Based on the disclosure, one skilled in the art should appreciate that one aspect described herein may be implemented independently of any other aspects and that two or more of these aspects may be combined in various ways. For example, an apparatus may be implemented and/or a method practiced using any number of the aspects set forth herein. Additionally, such an apparatus may be implemented and/or such a method may be practiced using other structure and/or functionality in addition to one or more of the aspects set forth herein.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present disclosure, and the drawings only show the components related to the present disclosure rather than the number, shape and size of the components in actual implementation, and the type, amount and ratio of the components in actual implementation may be changed arbitrarily, and the layout of the components may be more complicated.
In addition, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects may be practiced without these specific details.
As shown in fig. 1, an RVDT angular displacement sensor with adjustable sensitivity is provided in an embodiment of the present disclosure, and includes a rotating shaft 1 of the RVDT angular displacement sensor and a rotating shaft sleeve 10 sleeved outside the rotating shaft 1, a rotor lamination 7 is fixedly disposed on the rotating shaft 1, and a stator winding 5 and an excitation winding 6 are fixedly disposed on an outer wall of the rotating shaft sleeve 10 at positions corresponding to the rotor lamination 7; still establish including the cover gather magnetic sleeve subassembly 8 outside stator winding 5 and excitation winding 6, gather magnetic sleeve subassembly 8 including the outer sleeve of mutual fixation and gather the magnetic inner sleeve, the outer sleeve with pivot sleeve 10 outer wall threaded connection makes gather magnetic sleeve subassembly 8 can axial displacement on the pivot sleeve 10.
Still including setting up bearing 4 in the pivot 1, the inner circle of bearing 4 with pivot 1 fixed connection, the outer lane of bearing 4 with the inner wall fixed connection of pivot sleeve 10, preferably, be located 1 both ends of pivot of gathering magnetism sleeve subassembly 8 both sides all set up bearing 4. Still include protecting crust 3, gather magnetic sleeve subassembly 8 set up in the protecting crust 3 inner chamber. One end of the protective shell 3 is provided with a top cover 2, and the other end is provided with a bottom cover 9 for sealing the interior of the protective shell 3.
As shown in fig. 2, when an external power supply supplies an ac voltage VE of a certain frequency to both ends (S1-S2) of the coil of the field winding 6, the magnetic flux generated thereby is guided to the stator winding 5 through the rotor lamination 7. At this time, if the rotor lamination 7 rotates, the gap rotation will cause the magnetic field distribution in the output winding space to change, thereby changing the mutual inductance between the excitation winding 6 and the output coil a of the stator winding 5, and between the excitation winding 6 and the output coil B of the stator winding 5, and finally causing the induced electromotive force VA at the two ends of the output coil a (S3-S4) and the induced electromotive force VB at the two ends of the output coil B (S5-S6) to change with the change of the core rotation angle.
The rotating shaft sleeve 10 and the magnetic gathering sleeve assembly 8 are connected through threads and can move along the axial direction. The magnetic gathering sleeve assembly 8 is located at different positions, and the amount of magnetic field acting on the stator winding 5 is different. The sensitivity of the RVDT angular displacement sensor is adjusted by adjusting the output voltage of the output coil A and the output coil B through adjusting the excitation magnetic field acting on the stator winding 5.
In a preferred construction, the bottom cover 9 is fixedly connected to the spindle sleeve 10, and the bottom cover 9 is provided with a protruding grip. Realize gathering through rotatory bottom 9 and realize rotating relatively between magnetic sleeve subassembly 8 and the pivot sleeve 10, after reaching regulation sensitivity, lock bottom 9, or can inject glue in protective housing 3, realize gathering magnetic sleeve subassembly 8 fixed, sensitivity's is fixed promptly.
Preferably, the stator lamination and the rotor lamination 7 in the stator winding 5 are made of soft magnetic alloy with low magnetic hysteresis. Firstly gluing soft magnetic alloy laminations, laminating into blank pieces, and then cutting by slow-speed wire to form finally required teeth, grooves, holes, excircles and the like. When the stator laminations are laminated, the rolling directions of the laminations are uniformly staggered at a certain angle on the circumference in a manner of rotating the laminations, so that the uniformity of the magnetic field intensity is improved, and the zero residual voltage is reduced.
As shown in fig. 2, the RVDT angular displacement sensor of this embodiment operates as follows:
(1) when the rotation angle of the rotor stack 7 is 0 °, the rotor stack 7 is in the center position for the output coils a and B, and the distance between the rotor stack 7 and the two output coils is equal. At this time, the mutual inductance between the output coil a of the field winding 6 and the stator winding 5 is equal to the mutual inductance between the field winding 6 and the output coil B, i.e., VA is VB, and the differential output voltage (VA-VB) is zero.
Preferably, the rotating shaft sleeve 10 is integrally processed, so that the coaxiality of the rotating shaft 1, the stator winding 5 and the excitation winding 6 is guaranteed.
Preferably, the material of the stator laminations and the rotor laminations 7 of the stator winding 5 is selected to be a soft magnetic alloy material with low magnetic hysteresis, such as 1J 79. The laminations are uniformly stacked in all directions of magnetization to uniformly distribute the internal magnetic field.
Preferably, the protective shell 3 is made of soft magnetic material, and can shield the interference of an external magnetic field to the RVDT angular displacement sensor.
(2) When the rotation angle of the rotor lamination 7 is in the positive direction at full range, the distance from the rotor lamination 7 to the output coil a is maximized and the distance from the rotor lamination to the output coil B is minimized. At this time, the mutual inductance between the exciting winding 6 and the output coil a reaches the maximum value (VA output reaches the maximum), the mutual inductance between the exciting winding 6 and the output coil B reaches the minimum value (VB output reaches the minimum), and the differential output voltage (VA-VB) reaches the positive maximum value.
(3) When the rotation angle of the rotor lamination 7 is a negative direction full scale, the distance from the notch to the output coil a is minimized, and the distance to the output coil B is maximized. At this time, the mutual inductance between the rotor lamination 7 and the output coil a reaches the minimum value (VA output reaches the minimum), the mutual inductance between the excitation winding 6 and the output coil B reaches the maximum value (VB output reaches the maximum), and the differential output voltage (VA-VB) reaches the negative maximum value.
(4) When the rotation angle of the rotor stack 7 is at another angle, the induced electromotive forces VA and VB also take corresponding values as shown in fig. 3, and the differential output voltage (VA-VB) calculated from this is linear with the rotation angle of the rotor stack 7 as shown in fig. 4, so the rotation angle size and direction of the rotor stack 7 can be calculated from the values of the differential voltage. The sensitivity of the differential voltage is obtained from the slope of the voltage of the differential output.
(5) And (5) adjusting the position of the magnetic gathering sleeve assembly 8, changing the magnetic field excited on the stator winding 5, and repeating the steps (1) to (4) to obtain the sensitivity of the differential voltage.
Preferably, the magnetic conductivity of the magnetic gathering sleeve can be improved through high-temperature treatment, and large-amplitude sensitivity adjustment can be realized within a small stroke range.
It has been found by theory and practice that the sensitivity of the angular displacement sensor is minimal when the flux concentrating sleeve assembly 8 completely wraps the stator laminations. As the distance between the flux concentrating sleeve assembly 8 and the stator laminations increases, the sensitivity to angular displacement increases and the sensitivity of the sensor decreases after a certain distance. Preferably, the left edge of the flux sleeve 8 is arranged to just wrap around the stator lamination, with the maximum span being that the left edge just detaches from the stator lamination. The internal space and volume of the sensor can be effectively reduced.
The above description is only for the specific embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present disclosure should be covered within the scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims.
Claims (7)
1. An RVDT angular displacement sensor with adjustable sensitivity is characterized by comprising a rotating shaft of the RVDT angular displacement sensor and a rotating shaft sleeve sleeved outside the rotating shaft, wherein a rotor lamination is fixedly arranged on the rotating shaft, and a stator winding and an excitation winding are fixedly arranged on the outer wall of the rotating shaft sleeve corresponding to the position of the rotor lamination; the magnetic-gathering sleeve assembly is sleeved outside the stator winding and the excitation winding and comprises an outer sleeve and a magnetic-gathering inner sleeve which are fixed with each other, and the outer sleeve is in threaded connection with the outer wall of the rotating shaft sleeve to enable the magnetic-gathering sleeve assembly to axially move on the rotating shaft sleeve;
the bearing is arranged on the rotating shaft, an inner ring of the bearing is fixedly connected with the rotating shaft, and an outer ring of the bearing is fixedly connected with the inner wall of the rotating shaft sleeve.
2. The adjustable sensitivity RVDT angular displacement sensor of claim 1, wherein bearings are provided at both ends of the shaft on both sides of the flux gathering sleeve assembly.
3. The adjustable sensitivity RVDT angular displacement sensor of claim 1, further comprising a protective shell, the flux gathering sleeve assembly disposed within the protective shell interior cavity.
4. The RVDT angular displacement sensor with adjustable sensitivity according to claim 3, wherein the protective shell is made of soft magnetic material and is used for shielding the interference of an external magnetic field to the RVDT angular displacement sensor.
5. The adjustable sensitivity RVDT angular displacement sensor according to claim 4, characterized in that the protective housing is provided with a top cover at one end and a bottom cover at the other end for sealing the inside of the protective housing.
6. The adjustable sensitivity RVDT angular displacement sensor of claim 5, wherein the bottom cover is fixedly connected to the shaft sleeve and wherein the bottom cover is provided with a protruding handle.
7. The adjustable sensitivity RVDT angular displacement sensor according to claim 1, characterized in, that the material of the stator laminations and the rotor laminations in the stator winding is a soft magnetic alloy material with low magnetic hysteresis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011520780.4A CN112687460B (en) | 2020-12-21 | 2020-12-21 | RVDT angular displacement sensor with adjustable sensitivity |
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| CN202011520780.4A CN112687460B (en) | 2020-12-21 | 2020-12-21 | RVDT angular displacement sensor with adjustable sensitivity |
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| CN112687460B true CN112687460B (en) | 2022-09-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110986753A (en) * | 2019-11-29 | 2020-04-10 | 苏州长风航空电子有限公司 | Double-redundancy non-contact transformer type angular displacement sensor |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110986753A (en) * | 2019-11-29 | 2020-04-10 | 苏州长风航空电子有限公司 | Double-redundancy non-contact transformer type angular displacement sensor |
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