A mover assembly of a series double-redundancy linear displacement sensor and a debugging method

Abstract

This invention discloses a moving part assembly and debugging method for a series dual-redundant linear displacement sensor, comprising: a moving rod, a magnetic core pad, an outer magnetic core assembly, and an inner magnetic core assembly; the moving rod is provided with an installation operation part, one end of the moving rod is provided with a first connecting part, and the other end of the moving rod is provided with a second connecting part; the magnetic core pad is installed on the moving rod and is located between the outer magnetic core assembly and the installation operation part; the beneficial effect of this invention is that by assembling the two dual-redundant iron cores in series on a connecting rod, the radial dimension of the sensor is effectively reduced, satisfying the space requirements of the original single-redundant sensor, satisfying and improving the consistency of product channels, and the moving part assembly of the linear displacement sensor meets the requirements of a series dual-redundant sensor.

Description

Technical Field

[0001] This invention relates to the field of series dual-redundant linear displacement sensor technology, and in particular to a mover assembly and debugging method for a series dual-redundant linear displacement sensor. Background Technology

[0002] Dual-redundant linear displacement sensors are widely used in fly-by-wire flight control systems and engine systems of aircraft. The purpose of their dual-redundancy design is to ensure that if one set of winding coils fails, the other backup winding will start working, guaranteeing normal sensor performance output. A dual-redundant linear displacement sensor mainly consists of a moving element assembly and a stationary element assembly, with the moving element assembly being a crucial structure for the sensor's functionality.

[0003] Currently, most existing dual-redundant linear displacement sensors employ a parallel configuration with dual windings and dual cores. While this type of parallel dual-redundant linear displacement sensor is widely used, its operation is somewhat limited for some sensors with relatively high radial dimension requirements. Furthermore, it is difficult or impossible to install in confined spaces, limiting its applicability and failing to meet usage requirements. Therefore, the main focus of this invention is to address both product channel consistency and the dual-redundancy requirements of the linear displacement sensor. This invention was developed through in-depth research into the aforementioned issues. Summary of the Invention

[0004] The purpose of this invention is to solve the above-mentioned problems by designing a moving part assembly and debugging method for a series dual-redundant linear displacement sensor. This solves the problems that the operation mode of the parallel structure is relatively simple, and it is impossible or difficult to install when the installation location is a narrow space, resulting in a narrow range of application and failure to meet the usage requirements.

[0005] The technical solution of the present invention to achieve the above objectives is as follows: a moving part assembly of a series dual-redundant linear displacement sensor, comprising: a moving rod, a magnetic core pad, an outer magnetic core assembly, and an inner magnetic core assembly;

[0006] The movable rod is provided with an installation operation part, one end of the movable rod is provided with a first connecting part, and the other end of the movable rod is provided with a second connecting part; The magnetic core pad is mounted on the moving rod and is located between the outer magnetic core assembly and the mounting operation part.

[0007] Preferably, a first vent hole is provided on the movable rod at one end of the second connecting part.

[0008] Preferably, the outer core assembly includes: a first core adapter shaft, a first multi-segment core, a first core sheath, and an inner core adapter shaft; One end of the first magnetic core adapter shaft is provided with a third connecting part, and the other end of the first magnetic core adapter shaft is provided with a first shoulder; The first magnetic core sheath is installed at one end of the first shaft shoulder; The inner adapter shaft of the magnetic core is provided with a fourth connecting part at one end and a second shoulder at the other end; The inner adapter shaft of the magnetic core is installed at one end of the first magnetic core sheath; The first multi-segment magnetic core is installed inside the first magnetic core sheath, and the first multi-segment magnetic core is located between the first magnetic core adapter shaft and the inner adapter shaft of the magnetic core; The diameter of the first magnetic core adapter shaft is larger than the diameter of the first magnetic core sheath.

[0009] Preferably, the inner adapter shaft of the magnetic core is provided with a through hole, and the inner adapter shaft of the magnetic core is provided with a second vent hole, which is connected to the through hole.

[0010] Preferably, the first magnetic core sheath has a first inner hole and a first outer diameter, and the first shoulder is inserted into the first inner hole.

[0011] Preferably, the internal components of the magnetic core include: a second magnetic core adapter shaft, a second multi-segment magnetic core, a second magnetic core sheath, and a magnetic core plug; The second magnetic core adapter shaft has a fifth connecting part at one end and a third shoulder at the other end. The inner adapter shaft of the magnetic core is fixedly connected to the third shoulder by a thread. The second magnetic core sheath is installed at one end of the third shaft shoulder; The magnetic core plug is installed at one end of the second magnetic core sheath; The second multi-segment magnetic core is installed inside the second magnetic core sheath, and the second multi-segment magnetic core is located between the second magnetic core adapter shaft and the magnetic core plug; The diameter of the second magnetic core adapter shaft is larger than the diameter of the second magnetic core sheath.

[0012] Preferably, the magnetic core plug has a step, the magnetic core plug has an encapsulation hole inside, the second magnetic core sleeve has a second inner hole, the second magnetic core sleeve has a second outer diameter, the step is connected to the second inner hole, and the second outer diameter is welded to the step.

[0013] Preferably, the first connecting part, the second connecting part, the third connecting part, the fourth connecting part, and the fifth connecting part are all threaded.

[0014] A method for debugging the mover assembly of a series dual-redundant linear displacement sensor includes: The movable rod is fixed by a zeroing fixture; The stator assembly is fixed by a zeroing fixture, and then the positions of the stator assembly and the moving rod are adjusted to reach the zero position L; When debugging the moving part assembly, the sensor zero-point position is debugged by first debugging the outer component of the magnetic core and then debugging the inner component of the magnetic core. The zero position A of the outer core assembly coincides with the zero position A of the outer coil winding. The displacement △A is adjusted by increasing or decreasing the number of core pads between the second connecting part and the third connecting part on the moving rod to achieve a zero position △A of 0, that is, the zero position A of the outer coil winding coincides with the zero position A of the outer core assembly, and is fixed with thread adhesive. The zero position B of the inner component of the magnetic core coincides with the zero position B of the inner winding of the coil. The displacement △B is adjusted by increasing or decreasing the number of magnetic core shims between the fourth and fifth connecting parts to achieve a zero position △B of 0, that is, the zero position B of the inner winding of the coil coincides with the zero position B of the inner component of the magnetic core, and is fixed with thread adhesive.

[0015] A series dual-redundant linear displacement sensor includes a moving part assembly and a stationary part assembly as described above; The stator assembly includes: a front cover, a front housing, an outer coil winding, an inner coil winding, an inner sleeve, a rear cover, a through screw, a connector, a base, and a protective cover. The front housing is fitted onto the front end cover. The outer winding of the coil is installed inside the front housing. The inner winding of the coil is installed at one end of the outer winding of the coil. The inner sleeve is fitted onto the outer winding of the coil and the inner winding of the coil. The rear end cover is installed at one end of the front housing. The connector is installed on the rear end cover. The through screw is installed on the rear end cover and the connector. The base is installed at one end of the rear end cover. The protective cover is installed on the rear end cover.

[0016] The moving part assembly and debugging method of the series dual-redundant linear displacement sensor manufactured using the technical solution of the present invention have the following beneficial effects: 1. By assembling the two redundant iron cores in series on a connecting rod, the radial dimension of the sensor is effectively reduced, which meets the space requirements of the original single-redundancy sensor. This satisfies and improves the consistency of the product channel. The linear displacement sensor mover assembly meets the series double-redundancy structure required by the double-redundancy sensor. 2. By using tooling to insert the magnetic core into the magnetic core sleeve, and by using the magnetic core sleeve and magnetic core plug to restrict the position and shape of the strip, the strip is fixed into the shape of the magnetic core, which has good applicability and ease of installation; 3. The design of the magnetic core adapter shaft being thicker than the magnetic core sheath greatly improves the wear resistance of the magnetic core and enhances the reliability of the product. 4. By designing vent holes on the adapter shaft and moving rod inside the magnetic core, the pressure inside the adapter shaft and moving rod during assembly is effectively balanced, thereby improving the reliability of the product. Attached Figure Description

[0017] Figure 1 This invention relates to the equivalent circuit of a linear displacement sensor in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor. Figure 2 This is an output characteristic diagram of the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention; Figure 3 This is an assembly diagram of the moving part of a series dual-redundant linear displacement sensor and its debugging method according to the present invention. Figure 4 This is a cross-sectional view of the magnetic core internal component in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 5 This is an exploded view of the magnetic core components in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 6 This is a cross-sectional view of the outer magnetic core component in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 7 This is an exploded view of the outer magnetic core component in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 8 This is a schematic diagram of the linear displacement sensor structure in the moving part assembly and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 9 This is a schematic diagram of the zero-point position of the linear displacement sensor in the moving part assembly and debugging method of the series dual-redundant linear displacement sensor of the present invention. Figure 10 This is an exploded view of the stationary component in the moving component and debugging method of a series dual-redundant linear displacement sensor of the present invention. Figure 11 This is an exploded view of the moving part component in the moving part component and debugging method of a series dual-redundant linear displacement sensor of the present invention.

[0018] In the diagram: 1-Moving rod, 2-Core pad, 3-Outer core assembly, 4-Inner core assembly, 11-Installation and operation part, 12-First connecting part, 13-Second connecting part, 14-First vent hole, a31-First core adapter shaft, a32-First multi-segment core, a33-First core sheath, 34-Inner core adapter shaft, a311-Third connecting part, a312-First shoulder, 341-Fourth connecting part, 342-Second shoulder, 343-Through hole, 344-Second vent hole, a331-First inner hole, a332-First outer diameter, b31-The Two-core adapter shaft, b32-second multi-segment magnetic core, b33-second magnetic core sheath, 41-magnetic core plug, b311-fifth connecting part, b312-third shoulder, 411-step, 412-potting hole, b331-second inner hole, b332-second outer diameter, 100-moving component assembly, 200-stationary component assembly, 201-front end cover, 202-front housing, 203-outer winding of coil, 204-inner winding of coil, 205-inner sleeve, 206-rear end cover, 207-through screw, 208-connector, 209-base, 210-protective cover. Detailed Implementation

[0019] The present invention will now be described in further detail and in complete form with reference to specific embodiments. The following description is merely exemplary and is not intended to limit the scope, application, or use of this disclosure.

[0020] like Figure 1-11 As shown, a moving part assembly and debugging method of a series dual-redundant linear displacement sensor are disclosed.

[0021] Example: Taking a linear differential transformer displacement sensor as an example, the principle of a linear sensor is explained simply. A linear differential transformer displacement sensor is an inductive sensor that converts a non-electrical mechanical displacement change into a proportional electrical parameter change. Ignoring the parasitic capacitance of the coil and the losses in multiple magnetic core segments, the equivalent circuit of the linear displacement sensor is shown below. Figure 1 As shown.

[0022] in Figure 1 middle: This is the excitation voltage of the primary coil; , These are the primary coil inductance and resistance, respectively; , These are two secondary coil inductors; , The primary coil and the two secondary coils are mutually inducted, respectively. , These are the resistors of the two secondary coils.

[0023] Within the measurement range and under open-circuit load conditions, based on the formula for calculating the output potential of a linear displacement sensor, the characteristic relationship between the output potential and the displacement of multiple magnetic core segments can be expressed as follows: Figure 2 As shown.

[0024] in Figure 2 middle: , The output potential is provided for the two secondary coils; This is the differential output potential; This represents the distance that multiple magnetic core segments deviate from the center position.

[0025] like Figure 3-11 As shown, the present invention proposes a moving part assembly and debugging method for a series dual-redundant linear displacement sensor, including: a moving part assembly for a series dual-redundant linear displacement sensor, comprising: a moving rod 1, a magnetic core pad 2, an outer magnetic core assembly 3, and an inner magnetic core assembly 4.

[0026] The movable rod 1 is provided with an installation operation part 11, one end of the movable rod 1 is provided with a first connecting part 12, and the other end of the movable rod 1 is provided with a second connecting part 13; the installation operation part 11 is a groove or operation hole structure.

[0027] When debugging the actuator assembly, the sensor zero-point position is debugged by first debugging the outer magnetic core assembly 3 and then debugging the inner magnetic core assembly 4.

[0028] The magnetic core pad is installed on the moving rod 1 and is located between the outer magnetic core assembly 3 and the installation operation part 11.

[0029] A first vent hole 14 is provided on the moving rod 1 at one end of the second connecting part 13.

[0030] The magnetic core outer component 3 and the moving rod 1 are threadedly connected at one end of the installation operation part 11. By operating the installation operation part 11, the first connecting part 12 and the second connecting part 13 on the moving rod 1 are fixedly connected to the position to be installed by applying thread adhesive. The first vent hole 14 can effectively balance the pressure and excess thread adhesive generated when the moving rod 1 and the magnetic core outer component 3 are assembled.

[0031] The outer core assembly 3 includes: a first magnetic core adapter shaft a31, a first multi-segment magnetic core a32, a first magnetic core sheath a33, and an inner core adapter shaft 34.

[0032] The first magnetic core adapter shaft a31 has a third connecting part a311 at one end. The third connecting part a311 and the second connecting part 13 are coated with thread adhesive and fixed by thread connection. The first magnetic core adapter shaft a31 has a first shoulder a312 at the other end.

[0033] The first magnetic core sheath a33 is installed at one end of the first shaft shoulder a312.

[0034] One end of the inner core adapter shaft 34 is provided with a fourth connecting part 341, and the other end of the inner core adapter shaft 34 is provided with a second shoulder 342.

[0035] The inner adapter shaft 34 of the magnetic core is installed at one end of the first magnetic core sheath a33.

[0036] The first multi-segment magnetic core a32 is installed inside the first magnetic core sheath a33, and the first multi-segment magnetic core a32 is located between the first magnetic core adapter shaft a31 and the inner magnetic core adapter shaft 34.

[0037] The zero position A2 of the outer core assembly 3 and the zero position A1 of the outer coil winding 203 are adjusted by increasing or decreasing the number of core pads 2 between the second connecting part 13 on the moving rod 1 and the third connecting part a311 on the outer core assembly 3 to achieve a zero position △A of 0.

[0038] The inner adapter shaft 34 of the magnetic core is provided with a through hole 343 and a second vent hole 344, which is connected to the through hole 343.

[0039] The first magnetic core sheath a33 has a first inner hole a331 and a first outer diameter a332. The first shoulder a312 is inserted into the first inner hole a331 and laser welded. The inner adapter shaft 34 of the magnetic core is laser welded to the other end of the first magnetic core sheath a33.

[0040] The first multi-segment magnetic core a32 is placed inside the first magnetic core sheath a33 and compacted. The inner core adapter shaft 34 and the first magnetic core sheath a33 restrict the position and shape of the first multi-segment magnetic core a32.

[0041] Sealant is injected into the through hole 343. The sealant includes, but is not limited to, BJ-18. After vacuum injection, it is injected under high pressure and cured at high temperature. After curing, threads are machined at the through hole 343 to finally form the outer component 3 of the magnetic core.

[0042] The inner component 4 of the magnetic core includes: a second magnetic core adapter shaft b31, a second multi-segment magnetic core b32, a second magnetic core sheath b33, and a magnetic core plug 41.

[0043] The second magnetic core adapter shaft b31 has a fifth connecting part b311 at one end and a third shoulder b312 installed at the other end. The inner adapter shaft 34 of the magnetic core is fixedly connected to the third shoulder b312 by a thread.

[0044] The second magnetic core sheath b33 is installed at one end of the third shaft shoulder b312.

[0045] The magnetic core plug 41 is installed at one end of the second magnetic core sheath b33.

[0046] The second multi-segment magnetic core b32 is installed inside the second magnetic core sheath b33, and the second multi-segment magnetic core b32 is located between the second magnetic core adapter shaft b31 and the magnetic core plug 41.

[0047] The magnetic core plug 41 has a step 411 and an encapsulation hole 412 inside. The second magnetic core sleeve b33 has a second inner hole b331 and a second outer diameter b332. The step 411 is connected to the second inner hole b331, and the second outer diameter b332 is connected to the step 411 by laser welding.

[0048] The second multi-segment magnetic core b32 is placed inside the second magnetic core sleeve b33 and compacted. After the second multi-segment magnetic core b32 is placed inside the second inner hole b331 of the second magnetic core sleeve b33 and compacted, the position and shape of the second multi-segment magnetic core b32 are restricted by the magnetic core plug 41 and the second magnetic core sleeve b33.

[0049] Fill the injection hole 412 with sealant, including but not limited to BJ-18. After vacuum injection, inject under high pressure and cure at high temperature. Drill out the sealant in the injection hole 412. Use welding wire laser welding to seal the injection hole 412 and grind it smooth.

[0050] During zeroing, the moving rod 1 is fixed by the zeroing fixture.

[0051] The stator assembly 200 is fixed by a zeroing fixture, and then the position of the stator assembly 200 and the moving rod 1 is adjusted to reach the zero position L.

[0052] When debugging the actuator assembly, the sensor zero-point position is debugged by first debugging the outer magnetic core assembly 3 and then debugging the inner magnetic core assembly 4.

[0053] The zero position A2 of the outer core assembly 3 coincides with the zero position A1 of the outer coil winding 203. The displacement △A is adjusted by increasing or decreasing the number of magnetic core pads 2 between the second connecting part 13 and the third connecting part a311 on the moving rod 1 to achieve a zero position △A of 0, that is, the zero position A1 of the outer coil winding coincides with the zero position A2 of the outer core assembly 3, and is fixed with thread adhesive.

[0054] The zero position B2 of the inner core assembly 4 coincides with the zero position B1 of the inner coil winding 204. The displacement △B is adjusted by increasing or decreasing the number of core pads 2 between the fourth connection part 341 and the fifth connection part b311 to achieve a zero position △B of 0, that is, the zero point B1 of the inner coil winding coincides with the zero position B2 of the inner core assembly 4, and is fixed with thread adhesive.

[0055] The first connecting part 12, the second connecting part 13, the third connecting part a311, the fourth connecting part 341, and the fifth connecting part b311 are all threaded.

[0056] The mover assembly 100 and debugging method provided by the present invention effectively improve the channel consistency and other performance of the product by first debugging the zero position of the outer magnetic core assembly 3 and the outer winding 203 of the coil, and then debugging the zero position of the inner magnetic core assembly 4 and the inner winding 204 of the coil. The design structure in which the diameter of the first magnetic core adapter shaft a31 and the second magnetic core adapter shaft b31 is relatively large compared with the diameter of the first magnetic core sheath a33 and the second magnetic core sheath b33 can effectively avoid magnetic core wear.

[0057] A series dual-redundant linear displacement sensor includes a moving element assembly 100 and a stationary element assembly 200 as described above. The stationary element assembly 200 includes: a front cover 201, a front housing 202, an outer coil winding 203, an inner coil winding 204, an inner sleeve 205, a rear cover 206, a through screw 207, a connector 208, a base 209, and a protective cover 210. The front housing 202 is fitted onto the front cover 201, and the outer coil winding 203 is mounted on the front cover 206. Inside the housing 202, the inner coil winding 204 is installed at one end of the outer coil winding 203, the inner sleeve 205 is fitted onto the outer coil winding 203 and the inner coil winding 204, the rear end cover 206 is installed at one end of the front housing 202, the connector 208 is installed on the rear end cover 206, the through screw 207 is installed on the rear end cover 206 and the connector 208, the base 209 is installed at one end of the rear end cover 206, and the protective cover 210 is installed on the rear end cover 206.

[0058] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. The above technical solutions only embody the preferred technical solutions of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A mover assembly for a series dual-redundant linear displacement sensor, characterized in that, include: Moving rod (1), magnetic core pad (2), magnetic core outer assembly (3), and magnetic core inner assembly (4); The movable rod (1) is provided with an installation operation part (11), one end of the movable rod (1) is provided with a first connecting part (12), and the other end of the movable rod (1) is provided with a second connecting part (13). The magnetic core pad (2) is installed on the moving rod (1) and is located between the magnetic core outer assembly (3) and the installation operation part (11); A first exhaust hole (14) is provided on the moving rod (1) and at one end of the second connecting part (13). The outer core assembly (3) includes: a first core adapter shaft (a31), a first multi-segment core (a32), a first core sheath (a33), and an inner core adapter shaft (34). The first magnetic core adapter shaft (a31) has a third connecting part (a311) at one end and a first shoulder (a312) at the other end. The first magnetic core sheath (a33) is mounted on one end of the first shaft shoulder (a312); The inner core adapter shaft (34) is provided with a fourth connecting part (341) at one end and a second shoulder (342) at the other end. The inner adapter shaft (34) of the magnetic core is installed at one end of the first magnetic core sheath (a33); The first multi-segment magnetic core (a32) is installed inside the first magnetic core sheath (a33), and the first multi-segment magnetic core (a32) is located between the first magnetic core adapter shaft (a31) and the magnetic core inner adapter shaft (34); The diameter of the first magnetic core adapter shaft (a31) is larger than the diameter of the first magnetic core sheath (a33).

2. The moving part assembly of a series dual-redundant linear displacement sensor according to claim 1, characterized in that, The inner adapter shaft (34) of the magnetic core is provided with a through hole (343) and a second vent hole (344) is provided on the inner adapter shaft (34), and the second vent hole (344) is connected to the through hole (343).

3. The moving part assembly of a series dual-redundant linear displacement sensor according to claim 2, characterized in that, The first magnetic core sheath (a33) has a first inner hole (a331) and a first outer diameter (a332). The first shoulder (a312) is inserted into the first inner hole (a331).

4. The moving part assembly of a series dual-redundant linear displacement sensor according to claim 3, characterized in that, The magnetic core internal assembly (4) includes: a second magnetic core adapter shaft (b31), a second multi-segment magnetic core (b32), a second magnetic core sheath (b33), and a magnetic core plug (41). The second magnetic core adapter shaft (b31) has a fifth connecting part (b311) at one end and a third shoulder (b312) installed at the other end. The inner adapter shaft (34) of the magnetic core and the third shoulder (b312) are fixedly connected by threads. The second magnetic core sheath (b33) is mounted on one end of the third shoulder (b312); The magnetic core plug (41) is installed at one end of the second magnetic core sheath (b33); The second multi-segment magnetic core (b32) is installed inside the second magnetic core sheath (b33), and the second multi-segment magnetic core (b32) is located between the second magnetic core adapter shaft (b31) and the magnetic core plug (41); The diameter of the second magnetic core adapter shaft (b31) is larger than the diameter of the second magnetic core sheath (b33).

5. The moving part assembly of a series dual-redundant linear displacement sensor according to claim 4, characterized in that, The magnetic core plug (41) has a step (411) and an encapsulation hole (412) inside. The second magnetic core sheath (b33) has a second inner hole (b331) and a second outer diameter (b332). The step (411) is connected to the second inner hole (b331), and the second outer diameter (b332) is welded to the step (411).

6. The moving part assembly of a series dual-redundant linear displacement sensor according to claim 5, characterized in that, The first connecting part (12), the second connecting part (13), the third connecting part (a311), the fourth connecting part (341) and the fifth connecting part (b311) are all threaded.

7. A method for debugging a mover assembly of a series dual-redundant linear displacement sensor, applied to the mover assembly as described in any one of claims 4-6, characterized in that, include: The movable rod (1) is fixed by a zeroing fixture; The stator assembly (200) is fixed by a zeroing fixture, and then the position of the stator assembly (200) and the moving rod (1) is adjusted to reach the zero position L; When the moving part (100) is debugged, the sensor zero position is debugged by first debugging the outer part (3) of the magnetic core and then debugging the inner part (4) of the magnetic core. The zero position A of the outer core assembly (3) and the zero position A of the outer coil winding (203) are adjusted by adjusting the displacement of △A. The zero position △A is 0 by increasing or decreasing the number of magnetic core pads (2) between the second connecting part (13) and the third connecting part (a311) on the moving rod (1). That is, the zero position A of the outer coil winding (203) coincides with the zero position A of the outer core assembly (3), and is fixed with thread glue. The zero position B of the inner core assembly (4) and the zero position B of the inner coil winding (204) are adjusted by adjusting the displacement of △B. The zero position △B is 0 by increasing or decreasing the number of magnetic core pads (2) between the fourth connection part (341) and the fifth connection part (b311). That is, the zero position B of the inner coil winding (204) coincides with the zero position B of the inner core assembly (4) and is fixed with thread glue.

8. A series dual-redundant linear displacement sensor, characterized in that, Includes the moving part assembly (100) and the stationary part assembly (200) as described in any one of claims 1-6; The stator assembly (200) includes: a front cover (201), a front housing (202), an outer coil winding (203), an inner coil winding (204), an inner sleeve (205), a rear cover (206), a through screw (207), a connector (208), a base (209), and a protective cover (210). The front housing (202) is fitted onto the front end cover (201). The outer coil winding (203) is installed inside the front housing (202). The inner coil winding (204) is installed at one end of the outer coil winding (203). The inner sleeve (205) is fitted onto the outer coil winding (203) and the inner coil winding (204). The rear end cover (206) is installed at one end of the front housing (202). The connector (208) is installed on the rear end cover (206). The through screw (207) is installed on the rear end cover (206) and the connector (208). The seat (209) is installed at one end of the rear end cover (206). The protective cover (210) is installed on the rear end cover (206).

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