CN115854857A - Angular displacement sensor based on injection molding resistance ring - Google Patents

Abstract

The invention provides an angular displacement sensor based on an injection molding resistance ring, which belongs to the technical field of measurement and testing and comprises a base, a bearing, a limiting pin, a resistance assembly, a brush shaft assembly, an electric brush assembly and an upper cover; the limiting pin has two positions, the resistance component has three sets, and the resistance component is coaxially connected in series, and comprises a synthetic resistance film, a conductive strip, a resistance ring and a rivet; the rivet is embedded and fixed on the resistance ring; the brush shaft assembly comprises a transmission shaft, a lower connecting sleeve, an upper connecting sleeve and three sets of brush assemblies; the transmission shaft is hinged with the upper cover and coaxially fixed with the rudder shaft; the three sets of electric brush assemblies are respectively arranged on one side of the resistance assembly close to the upper cover; the lower connecting sleeve and the upper connecting sleeve are coaxially fixed with the transmission shaft respectively; the electric brush assembly comprises a collecting ring and two sets of electric brushes, and the first resistor assembly, the second resistor assembly, the third resistor assembly and the upper cover are sequentially connected in series and then fixed on the base. The invention solves the problem of poor linear precision and electrical reliability of the existing angular displacement sensor.

Description

An Angular Displacement Sensor Based on Injection Molded Resistance Ring

technical field

The invention belongs to the technical field of measurement and testing, and in particular relates to an angular displacement sensor based on an injection molding resistance ring.

Background technique

Servo mechanism is a general term for the subsystems of aerospace flight control actuators in my country, and high-power electric servo mechanism is an important research direction at present. The supporting angular displacement sensor of the high-power servo mechanism has high precision, high reliability, and three redundant structures. The actuator constitutes a three-redundant electromechanical servo actuator. Each actuator contains an angular displacement sensor. It contains four angular displacement sensors, which convert the mechanical swing angle signal into an electrical signal output in the case of external power supply, and are used to measure the engine rotation angle.

The angular displacement sensor of the aerospace vehicle has a special installation position, limited space, large vibration magnitude, complex alignment of the electrical zero position of the angular displacement sensor and the mechanical zero position of the rudder shaft, easy loosening of rivets at the input and output connections, and low electrical reliability. Ordinary angular displacement sensors are difficult to achieve electrical zero and mechanical zero alignment in a limited installation space. It is realized through system compensation, but system compensation will waste system resources and reduce the software resources of the servo system. In the environment of a large number of vibrations, the electrical reliability of ordinary angular displacement sensors is low. The existing angular displacement sensor structure adopts the method of riveting the resistance ring and the rivet. During the riveting process of the resistance ring and the rivet, the resistance ring will bear the stress from the external riveting rivet, and the matrix of the resistance ring will generate the stress of the resistance ring after forming. The deformation changes the linearity of the resistor body and reduces the linear accuracy of the angular displacement sensor. At the same time, the rivet at the input-output connection is easy to loosen and rotate during the vibration process, and the input-output disconnection phenomenon occurs.

At present, the angular displacement sensors at home and abroad mainly include potentiometer type, photoelectric type, electromagnetic type and rotary transformer type. The photoelectric type has poor anti-vibration performance, the electromagnetic type is sensitive to the interference of strong magnetic fields, and the output signal of the rotary transformer type is seriously disturbed, so it is widely used. The resistive body rivet riveting forming angular displacement sensor cracks seriously and the linearity changes significantly under stress. These forms of angular displacement sensors are difficult to meet the angular displacement measurement requirements of the rudder shaft in the control cabin of high-power aerospace vehicles.

To sum up, the linearity accuracy and electrical reliability of the existing angular displacement sensors are poor, and the phenomenon that the resistance ring is easily cracked due to stress needs to be improved.

Contents of the invention

The invention provides an angular displacement sensor based on an injection-molded resistance ring, and aims to solve the problem that the existing angular displacement sensor has poor linearity accuracy and electrical reliability, and the resistance ring is easily cracked due to stress.

The purpose of the present invention is achieved through the following technical solutions:

An angular displacement sensor based on an injection molded resistance ring, including a base, a bearing, a limit pin, a resistance component, a brush shaft component, a brush component and an upper cover; Movement within the effective mechanical stroke range; there are three sets of resistance components, which are coaxially connected in series, namely the first resistance component, the second resistance component and the third resistance component; the resistance component includes a synthetic resistance film, a conductive strip, a resistance ring and a rivet ;The resistance ring and rivet are integrally formed by injection molding, and the rivet is inlaid and fixed on the resistance ring, and is welded and fixed with the input and output leads; the brush shaft assembly includes the transmission shaft, the lower connection sleeve, the upper connection sleeve and three sets of brush assemblies; the transmission shaft One end is hinged and fixed to the upper cover, and the other end is fixed coaxially with the rudder shaft after passing through the end face of the base; three sets of brush assemblies are respectively arranged on the side of the first resistance assembly, the second resistance assembly and the third resistance assembly near the upper cover The lower connecting sleeve and the upper connecting sleeve are coaxially fixed with the transmission shaft respectively; the lower connecting sleeve is arranged between the first resistance component and the second resistance component, and the upper connecting sleeve is arranged between the second resistance component and the third resistance component; The lower connecting sleeve and the upper connecting sleeve rotate synchronously with the transmission shaft; the brush assembly includes a collector ring and two sets of brushes. On the collector ring, it is close to the synthetic resistance film, and the installation position of the two sets of brushes is rotationally symmetrical along the transmission shaft 180°, and the conductive strip is glued to the resistance ring to form a symmetrical installation with the resistance film; the first resistance component, the second The resistance component, the third resistance component and the upper cover are serially connected in sequence and fixed on the base.

As a preferred solution, the rivet has an integrated structure, including a coaxially arranged nail cap, a necking slot and a nail tail, the nail cap is provided with a first installation hole in the axial direction, and the nail tail is provided with a second installation hole in the axial direction , the first mounting hole is a counterbore, and the second mounting hole is a pin hole.

As a preferred solution, the necking groove is used for inlaying and fixing, the outer diameters of the nail cap and the nail tail are equal and larger than the outer diameter of the necking groove, the first installation hole is a counterbore, and the second installation hole is a pin hole.

As a preferred solution, a knurled structure is also provided at the junction of the outer surface of the nail cap, the necking groove and the nail tail and the resistance ring.

As a preferred solution, the brush shaft assembly further includes a bearing, and the bearing has two disks, which are respectively arranged at both ends of the transmission shaft.

As a preferred solution, the material of the conductive strip is sheet-shaped beryllium bronze QBb2C, which is glued to the resistance ring with epoxy resin.

As a preferred solution, the brushes of the brush assembly are made of palladium-iridium alloy wires.

As a preferred solution, the synthetic resistance film is made by spraying the resistance liquid formula on the resistance ring.

As a preferred solution, the rivets are machined from brass, and the surface is silver-plated.

The beneficial technical effect that the present invention obtains is:

A three-redundant resistor ring axial series structure is designed, which can meet the system requirements that the output zero voltage of the three-redundancy is less than 10mmv, and it does not need to be realized through system software compensation, which improves the resource utilization efficiency of the servo system software. The integral structure design of resistance ring and rivet injection molding solves the problem of low linear accuracy of traditional angular displacement sensors. By adopting the integrated structural design of the resistance ring and the rivet injection molding, the problem of stress cracking of the resistance ring during the riveting process of the resistance ring and the rivet is solved, the qualified rate of the product is improved, and the production cost is reduced.

Description of drawings

Fig. 1 is a structural representation of one of the specific embodiments of the present invention;

Figure 2 is a top sectional view of Figure 1;

Fig. 3 is a schematic diagram of the resistance ring structure of one of the specific embodiments of the present invention;

Fig. 4 is the sectional view of A-A place among Fig. 3;

Fig. 5 is a schematic diagram of the parameter relationship related to the resistance value in one of the specific embodiments of the present invention;

Fig. 6 is a schematic diagram of a rivet structure used in the prior art;

Fig. 7 is a schematic diagram of the rivet structure of one of the specific embodiments of the present invention;

Reference signs: 1. base; 2. bearing; 3. limit pin; 4. first resistance component; 5. second resistance component; 6. third resistance component; 7. brush shaft component; 8. lower connection sleeve ;9, upper connection sleeve; 10, brush assembly; 11, upper cover; 12, synthetic resistance film; 13, conductive strip; 14, resistance ring; 15, screw; 16, rivet; 17, traditional rivet; 161, nail Cap; 162, necking slot; 163, nail tail; 164, first mounting hole; 165, second mounting hole.

Detailed ways

The technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figures 1 to 7, a specific embodiment of an angular displacement sensor based on an injection molded resistance ring includes a base 1, a bearing 2, a limit pin 3, a resistance assembly, a brush shaft assembly 7, a brush assembly 10 and an upper cover 11. For the convenience of description, in this specific embodiment, the installation plane and axial direction of the base 1 are used as the reference to define the direction. The installation plane of the base 1 is perpendicular to the end face. In FIG. The inward direction is the front, and the vertical outward direction is the rear; on the installation plane of the base 1, the side close to the round hole, that is, the left side in Figure 1 is the left, and the side close to the U-shaped groove is the right; The end face of 1 is vertical, the side away from the end face, that is, the top in Figure 1 is up, and the side close to the end face is down.

There are two limit pins 3 in this specific embodiment, and their function is to limit the movement of the brush within the effective mechanical stroke range of the resistive film. There are three sets of resistance components, coaxially arranged in series, which are respectively the first resistance component 4 , the second resistance component 5 and the third resistance component 6 . The resistive assembly includes a composite resistive film 12 , conductive strips 13 , resistive rings 14 and rivets 16 . Synthetic resistance film 12 is the key part of the sensor. The corresponding voltage signal output is picked up by the movement of the brush assembly 10 on the synthetic resistance film 12 of the resistance assembly. The synthetic resistance film 12 is made by spraying the resistance liquid formula on the resistance ring 14 .

In the prior art, the resistance ring 14 is molded, and the rivets are assembled to the resistance ring 14 by riveting. The key steps of the process flow include:

S1, heat treatment of skeleton plate;

S2. Machining size, the machining process includes 13 processes;

S3, spray film;

S4, riveting rivets;

S5, thermal aging, set the temperature at 125°C, and refine for 12 hours;

S6. Silver filling and drying, set the temperature at 150° C., and dry for 1 hour.

As shown in Figures 3 to 4, the resistance ring 14 and the rivet 16 in this specific embodiment adopt an injection-molded integral structure without assembly, and the key steps of the process flow include:

S101. Re-inspection of injection molded skeleton;

S102, machining deburring, chamfering, there are only 2 processes in the machining process;

S103, spray film;

S104, thermal aging, set the temperature at 125°C, and refine for 12 hours;

S105, drying the silver filling, setting the temperature at 150° C., and drying for 1 hour.

Compared with the method of riveting after compression molding in the prior art, the structural design of injection molding reduces the processing steps, reduces the production time, shortens the production cycle, and improves product performance. The design of compression molding and injection molding The performance comparison is shown in Table 1:

Table 1 Performance comparison of compression molding and injection molding designs

From the comparative analysis in Table 1, it can be seen that the performance of the injection molding design is significantly better than that of the traditional compression molding design.

In the prior art, the rivet is riveted after the resistance ring is formed, and the tail end of the rivet is reversed under stress, squeezing the matrix of the resistance ring. When the rivets are turned over by the stress, the resistance ring will also be deformed by the stress, which is prone to cracking. Since the resistance film is sprayed on the base of the resistance ring, it will meet the required linear precision after linear repair and engraving, and the base of the resistance ring will Deformation will change the width of the resistive film, causing the resistance value per unit length of the resistive film to change.

As shown in Figure 5, under the condition of constant environmental conditions, the resistance value R is mainly affected by three factors, and the influence relationship is as follows:

Among them, ρ represents the resistivity of the resistive film material, L represents the length of the resistor body, and S represents the cross-sectional area of the resistor body.

According to the analysis of the above formula, in the process of riveting the resistor ring and the rivet in the prior art, the resistor ring is deformed by the stress, which changes the cross-sectional area S of the resistor body, thereby changing the resistance value per unit length and affecting the resistance of the entire resistor body. linear precision.

In this specific embodiment, the resistance ring 14 and the rivet 16 are integrally formed by injection molding without riveting installation, which solves the problem of stress cracking of the resistance ring during the riveting process, improves the product qualification rate, reduces production costs, and shortens the production cycle.

As shown in FIG. 6 , the traditional rivet 17 in the prior art is limited by the installation process, the outer diameter of the main part is 2 mm, the strength is further reduced after the hole is opened, and the pre-tightening force during installation cannot be too large. In a vibration environment, the traditional rivet 17 is prone to axial rotation and radial loosening. Since both ends of the traditional rivet 17 are connected to the input and output wires, the rotation or loosening of the traditional rivet 17 will easily cause input or output disconnection, affecting Product reliability.

As shown in FIG. 7 , the rivet 16 in this specific embodiment is made of brass material by machining, and the surface is silver-plated. The rivet 16 has an integrated structure, including a coaxially arranged nail cap 161, a necking groove 162 and a nail tail 163. The nail cap 161 is axially provided with a first installation hole 164, and the nail tail 163 is axially provided with a first mounting hole. Two mounting holes 165. In this specific embodiment, the outer diameter of the constriction groove 162 is 2 mm, which is used for inlaying and fixing. The outer diameters of the nail cap 161 and the nail tail 163 are both 3 mm. The first mounting hole 164 is a counterbore with a specification of ￠1×1mm. The second mounting hole 165 is a pin shaft hole with a specification of ￠1.6×2.3mm. In order to increase the friction force, improve the connection strength between the rivet 16 and the resistance ring 14, improve the reliability at the same time, and prevent the axial rotation of the rivet, the outer surfaces of the nail cap 161, the necking groove 162 and the nail tail 163 are in contact with the resistance ring 14 A knurl structure is also provided at the junction. It should be noted that the material and size of the rivet 16 can be adaptively adjusted according to actual needs. The relevant parameters in this specific embodiment are only for clearer description and easy understanding, and are not the only solution. As limited. The nail cap 161, the necking groove 162 and the nail tail 163 can also adopt a non-circular cross-section structure, which can also achieve the effect of preventing the axial rotation between the rivet 16 and the resistance ring 14, which has no substance with this specific embodiment. gender difference.

In this specific embodiment, the rivet 16 is embedded and fixed on the resistance ring 14 through the constriction slot 162 , and the input and output lead welding is realized through the nail cap 161 and the nail tail 163 . The nail cap 161 , the necking groove 162 and the nail tail 163 are all used to achieve radial fixation. Axial rotation is prevented by providing a knurled structure at the junction with the resistance ring 14 . It effectively avoids the phenomenon of axial rotation or radial loosening of the rivet 16 in a vibration environment, eliminates the hidden danger of input or output disconnection caused by unreliable fixing of the rivet 16, and improves the reliability of the product.

In this specific embodiment, the brush shaft assembly 7 includes a transmission shaft, a lower connecting sleeve 8 , an upper connecting sleeve 9 and three sets of brush assemblies 10 . The quantity, specification and position of the brush assembly 10 are adaptively adjusted according to the specific conditions of the resistance assembly. Bearing 2 has two discs, which are arranged on the two ends of the transmission shaft, and are used to support the transmission shaft and reduce friction. According to actual needs, axle sleeves or other forms can also be used. One end of the transmission shaft is fixed on the loam cake 11 by a bearing, and the other end penetrates the end face of the base 1 and is coaxially fixed with the rudder shaft, and the transmission shaft and the base 1 are fixed by a bearing. Three sets of brush assemblies 10 are respectively arranged on the side of the first resistor assembly 4 , the second resistor assembly 5 and the third resistor assembly 6 close to the upper cover 11 , and move on the corresponding resistor assemblies to pick up the voltage output. The lower connecting sleeve 8 and the upper connecting sleeve 9 are fixed coaxially with the transmission shaft respectively, and are used to connect the brush assembly 10 and the transmission shaft, adjust the axial distance between adjacent brush assemblies 10, and realize the insulation between the brush assemblies 10 . The lower connection sleeve 8 is arranged between the first resistance assembly 4 and the second resistance assembly 5 , and the upper connection sleeve 9 is arranged between the second resistance assembly 5 and the third resistance assembly 6 . Interference connection is adopted between the lower connecting sleeve 8 and the upper connecting sleeve 9 and the transmission shaft, and the circumferential positioning is realized by the limit pin arranged in the radial direction.

The brush assembly 10 is connected and fixed to the lower connection sleeve 8 or the upper connection sleeve 9 by screws. The brush assembly 10 includes a collector ring and two sets of brushes. The collector ring is coaxially fixed and rotates synchronously with the transmission shaft through the lower connecting sleeve 8 or the upper connecting sleeve 9. The brush is fixed on the collector ring by screws and relies on itself The elasticity remains close to the synthetic resistance film 12. The installation position of the two sets of brushes is 180°rotationally symmetrical along the transmission shaft. The material of the conductive strip 13 is sheet-shaped beryllium bronze QBb2C, which is glued to the resistance ring 14 with epoxy resin. , form a symmetrical installation with the resistive film, the radian of the conductive strip is 162°, and adaptive adjustment can be made according to the actual needs, after pasting, spray the resistive liquid twice, the resistance between the longest two points of the conductive strip 13 should be less than 10′Ω . The brush slides on the composite resistive film 12 to pick up the voltage, and outputs it through the conductive strip 13 . In this specific embodiment, the electric brush adopts a three-redundancy scheme, has a special finger structure, and is made of palladium-iridium alloy wire.

The base 1 is used as a mounting flange, and is fixed on the cabin body or other bases by screws. The first resistor assembly 4 , the second resistor assembly 5 , the third resistor assembly 6 and the upper cover 11 are connected in series in sequence and fixed on the base 1 . In this specific embodiment, the base 1, the upper cover 11 and the mounting surfaces of the three sets of resistance components are provided with notch structures, which can be fixed in the axial direction by means of plugging, and at the same time, adjacent parts can be rotated relative to each other in the axial direction. Thus, a triple redundant design is realized. The first resistance assembly 4, the second resistance assembly 5, and the third resistance assembly 6 are fixed by screws 15. The mounting holes of the screws 15 are arc-shaped long holes, and their hole shapes are similar to oblong holes, but between the arcs on both sides The side wall is also set in a circular arc shape, and its function is to adjust the coincidence of the mechanical zero position and the electrical zero position of the resistance component.

The electrical zero and mechanical zero alignment of the triple redundant angular displacement sensor is the final link of the angular displacement sensor, which determines the electrical zero output accuracy of the triple redundant angular displacement sensor. In a limited installation space, the traditional angle It is difficult for the displacement sensor to meet the requirement that the electrical zero position and mechanical zero position alignment output are less than 10mmv, generally within the range of about 20mmv, so it can only be realized through system compensation, but system compensation will waste system resources and reduce the software of the servo system resource.

In this specific embodiment, by adopting an up-and-down plug-in connection mode between the three resistance components and a design that can rotate axially, the installation position of the first resistance component 4 is used as a reference, and the second resistance component 5 is based on the installation position of the first resistance component. The component 4 is used as a reference, and the mutual output electrical zero is less than 10mmv, and then the third resistance component 6 is rotated and adjusted based on the second resistance component 5, so that the electrical zero between the second resistance component 5 and the third resistance component 6 is output It is less than 10mmv, and finally through the differential adjustment of the three resistance components, the electrical output of the three redundancy is less than 10mmv output, so as to realize the alignment of the electrical zero position and the mechanical zero position of the angular displacement sensor.

The beneficial technical effects obtained by this specific embodiment include:

1. The axial series structure of three redundant resistance rings is designed. This structure has the characteristics of electrical zero position and mechanical zero position linkage and easy adjustment and alignment. It is realized through system software compensation, which improves the resource utilization efficiency of the software of the servo system. The electrical input and output of the angular displacement sensor with this structure are independent and reliable. Compared with the existing technology, there will be a leapfrog improvement in the three-channel zero misalignment index and reliability index, and the basic technology is relatively mature. The qualified rate is high, the production cost is low, and it is easy to realize.

2. The integrated structure design of resistance ring and rivet injection molding solves the problem of the resistance ring and rivet riveting process of the traditional angular displacement sensor. When the resistance ring receives riveting stress from the outside world, the stress deformation of the resistance ring matrix leads to low linearity of the resistance body. , which reduces the problem of linear accuracy of the angular displacement sensor.

3. By adopting the integrated structural design of resistance ring and rivet injection molding, the problem of stress cracking of the resistance ring during the riveting process of the resistance ring and rivet is solved, the qualified rate of the product is improved, and the production cost is reduced.

4. The joint surface of the resistance ring and the rivet adopts a knurled structure, which is beneficial to improve the axial stability of the rivet and the resistance ring after injection molding, reduces the probability of system failure, and avoids the axial vibration of the traditional angular displacement sensor rivet during vibration. The input or output of the electrical system is disconnected by the rotating drive, which reduces the reliability of the system.

To sum up, the technical solution proposed in this specific embodiment solves the problem that the existing angular displacement sensor has poor linear accuracy and electrical reliability, and is prone to cracking of the resistance ring due to stress, and has outstanding substantive features and significant progress.

Claims (9)

1. An angular displacement sensor based on injection molding resistance ring, it is characterized in that, comprises base (1), bearing (2), limit pin (3), resistance assembly, brush axle assembly (7), electric brush assembly ( 10) and loam cake (11); There are two limit pins (3), which are used to limit the movement of the brush within the effective mechanical stroke range of the resistance film; there are three sets of resistance components, which are arranged in series on the same axis, and are respectively the first resistance component (4) , the second resistance component (5) and the 3rd resistance component (6); The resistance component comprises synthetic resistance film (12), conductive strip (13), resistance ring (14) and rivet (16); The resistance ring (14) and the rivet (16) are integrally formed by injection molding, and the rivet (16) is inlaid and fixed on the resistance ring (14), and is welded and fixed with the input and output leads; The brush shaft assembly (7) includes a transmission shaft, a lower connection sleeve (8), an upper connection sleeve (9) and three sets of brush assemblies (10); one end of the transmission shaft is hingedly fixed to the upper cover (11), and the other end After passing through the end face of the base (1), it is coaxially fixed with the rudder shaft; three sets of brush assemblies (10) are respectively arranged on the first resistance assembly (4), the second resistance assembly (5) and the third resistance assembly (6) One side of the upper cover (11); the lower connecting sleeve (8) and the upper connecting sleeve (9) are respectively coaxially fixed with the transmission shaft; the lower connecting sleeve (8) is arranged on the first resistance assembly (4) and the second resistance assembly (5), the upper connection sleeve (9) is arranged between the second resistance assembly (5) and the third resistance assembly (6); the lower connection sleeve (8) and the upper connection sleeve (9) rotate synchronously with the transmission shaft ; The brush assembly (10) includes a collector ring and two sets of brushes. The collector ring is coaxially fixed and rotates synchronously with the transmission shaft through the lower connection sleeve (8) or the upper connection sleeve (9), and the brushes are fixed on the collector On the electric ring, it is close to the synthetic resistance film (12), and the installation positions of the two sets of brushes are rotationally symmetrical along the transmission shaft 180°, and the conductive strip (13) is glued to the resistance ring (14), forming a symmetrical installation with the resistance film; The first resistance component (4), the second resistance component (5), the third resistance component (6) and the upper cover (11) are serially connected in sequence and fixed on the base (1). 2. The angular displacement sensor according to claim 1, characterized in that, the rivet (16) is an integral structure, comprising a coaxially arranged nail cap (161), a necking groove (162) and a nail tail ( 163), the nail cap (161) is axially provided with a first mounting hole (164), the nail tail (163) is axially provided with a second mounting hole (165), and the first mounting hole (164) For counterbore, the second mounting hole (165) is pin hole. 3. The angular displacement sensor according to claim 2, characterized in that, the necking groove (162) is used for embedding and fixing, and the outer diameters of the nail cap (161) and the nail tail (163) are equal to and larger than The outer diameter of the necking groove (162), the first mounting hole (164) is a counterbore, and the second mounting hole (165) is a pin hole. 4. The angular displacement sensor according to claim 2, characterized in that, the junction between the outer surface of the nail cap (161), the necking groove (162) and the nail tail (163) and the resistance ring (14) is also provided Has knurled construction. 5. The angular displacement sensor according to claim 1, characterized in that, the brush shaft assembly (7) also includes a bearing (2), and the bearing (2) has two discs, which are respectively arranged at both ends of the transmission shaft . 6. The angular displacement sensor according to any one of claims 1 to 5, wherein the material of the conductive strip (13) is sheet-shaped beryllium copper QBb2C, which is glued to the resistance ring ( 14) on. 7. The angular displacement sensor according to any one of claims 1-5, characterized in that, the brushes of the brush assembly (10) are made of palladium-iridium alloy wires. 8. The angular displacement sensor according to any one of claims 1-5, characterized in that, the synthetic resistive film (12) is made by spraying resistive liquid formula on the resistive ring (14). 9. The angular displacement sensor according to any one of claims 1-5, characterized in that, the rivet (16) is made of brass material by machining, and the surface is silver-plated.

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