A high resolution angular measurement sensor

Abstract

The application discloses a high-resolution angle measurement sensor, four holes for placing coil windings are distributed at an axial interval of 90 degrees on a coil holder, the coil windings are composed of four groups of excitation coils, four groups of output coils and four groups of constant coils, two groups of excitation coils and two groups of constant coils are arranged in two opposite holes respectively, two groups of output coils are arranged in the other two holes respectively, the excitation coils are signal receiving ends, the output coils are electromagnetic induction ends, the constant coils are adjusting ends, all the coils form three groups of voltage loops, an iron core is arranged in the hole in the coil holder, after the excitation coils receive signals, the iron core rotates to change the output voltage of the output coils, and the changed output voltage is used to determine the rotating displacement of the iron core. The device can distinguish the angle displacement change of 2'' under the condition of 360° angle displacement, and converts the change into an electronic signal to feed back to a control system, and the precision is higher than 0.8% of the theoretical output value of the angle stroke.

Description

Technical Field

[0001] This invention belongs to the field of sensor technology, and in particular relates to a high-resolution angle measurement sensor. Background Technology

[0002] Conventional angle sensors are not precise or reasonable enough in terms of coil winding arrangement, excitation output coil division, and constant feedback adjustment output, resulting in problems such as low accuracy, slow response, and deviation throughout the measurement stroke. Summary of the Invention

[0003] Purpose of the invention

[0004] To solve the above-mentioned technical problems, the present invention provides an angular displacement measuring device. When the valve undergoes an angular displacement change, the device can measure the amount of displacement change and convert the amount of displacement into an electronic signal to be fed back to the control system for monitoring the valve opening of the engine control system regulator.

[0005] Invention Technology Solutions

[0006] A high-resolution angle measurement sensor includes a coil frame with four holes spaced 90° apart along the axial direction for placing coil windings. The coil windings consist of four sets of excitation coils, four sets of output coils, and four sets of constant coils. Two sets of excitation coils and two sets of constant coils are respectively placed in two opposite holes, and two sets of output coils are respectively placed in the other two holes. The excitation coils are signal receiving terminals, the output coils are electromagnetic induction terminals, and the constant coils are adjustment terminals. All coils form three voltage circuits. An iron core is placed in the inner hole of the coil frame. After the excitation coil receives a signal, the iron core rotates, causing a change in the output voltage of the output coils. The change in output voltage is used to determine the rotational displacement of the iron core.

[0007] Preferably, the coil windings are composed of multiple turns of copper wire bundled together. The number of turns in a single group of excitation coils is about 400, the number of turns in a single group of output coils is about 200, and the number of turns in a single group of constant coils is about 10. Each group of excitation coils, output coils, and constant coils needs to be shaped, wrapped, adjusted, and potted to ensure that the outer diameter of each type of coil winding is consistent, the coil windings are arranged neatly and orderly, the coils in each hole used to place the coil windings and the coils in the two opposite holes used to place the coil windings are symmetrically distributed, the coil windings are well insulated from the coil frame, and the length of all coil windings extending beyond the coil frame is consistent.

[0008] Preferably, the iron core is mounted on the connecting rod and pressed onto the connecting rod by the iron core pressure sleeve. The connecting rod is connected to the coupling, and the coupling is connected to the main unit.

[0009] Preferably, the coil frame is disposed within the cavity formed by the rear cover and the inner shell, and the rear cover and the inner shell axially limit the coil frame. The rear cover and the inner shell are disposed within the outer shell, and the gaps between all parts within the outer shell are filled with adhesive.

[0010] Preferably, rolling bearings are provided between the connecting rod and the inner shell, and between the iron core sleeve and the rear cover. The inner holes of the inner shell and the rear cover are provided with baffles for axially limiting the rolling bearings, and retaining rings are provided between the baffles and the rolling bearings.

[0011] Preferably, a sealing ring is provided between the outer shell and the inner shell.

[0012] Preferably, the outer diameter of the rolling bearing is 0.1 mm to 1.0 mm larger than the outer diameter of the iron core.

[0013] Preferably, a saddle-shaped washer is provided between the retaining ring and the rolling bearing, and the saddle-shaped washer has a compression space of 0.2mm to 0.8mm.

[0014] Preferably, a slot baffle is provided at the inlet of the hole for placing the coil winding.

[0015] Preferably, the holes used to place the coil windings are all oblong holes, with two opposite oblong holes having the same shape and size, and two adjacent oblong holes having different shapes and sizes.

[0016] Advantages of the present invention: The device can distinguish the 2″ angular displacement change under 360° angular displacement conditions and convert the change into an electronic signal to feed back to the control system. The accuracy is higher than 0.8% of the theoretical output value of the angular stroke, which can be used to monitor the opening of the regulator valve of the engine control system. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the high-resolution angle measurement sensor device of the present invention.

[0018] Figure 2 This is a schematic diagram of the coil unfolding.

[0019] Figure 3 This is a schematic diagram of the coil winding.

[0020] Figure 4 This is a schematic diagram of the iron core assembly structure.

[0021] Figure 5 This is a schematic diagram of the three-dimensional structure of the coupling.

[0022] Diagram labels: 1. Outer shell; 2. Rear cover; 3. Sealing ring; 4. Inner shell; 5. Coil winding; 6. Snap ring; 7. Rolling bearing; 8. Transmission housing; 9. Positioning pin; 10. Coupling; 11. Locking pin; 12. Coil frame; 13. Semicircular ring; 14. Iron core assembly; 15. Wire; 16. Saddle-shaped spring pad; 17. Baffle; 18. Cover plate; 19. Slotted baffle; 20. Iron core pressure sleeve; 21. Iron core; 22. Connecting rod; 23. Detailed Implementation

[0023] The present invention is achieved through the following technical solution.

[0024] The rear cover 2 and inner shell 4 are interference-fitted and reinforced and sealed by laser welding around the joint surface. The coil frame 12 is housed within the cavity formed by the rear cover 2 and inner shell 4. The rear cover 2 and inner shell 4 provide bidirectional limiting support for the coil frame 12, ensuring its axial fixation. A coil winding 5 is wound on the coil frame 12, and the coil winding 5 is connected to a wire 15, which passes through openings in the rear cover 2 and shell 1. Any gaps within the cavity formed by the rear cover 2 and inner shell 4 are filled with potting compound to form the induced voltage portion. The inner shell 4 is fixed within the transmission housing 8 by a semi-circular ring 13. The rear cover 2 and inner shell 4 are housed within the outer shell 1. A sealing ring 3 is installed between the outer circumference of the inner shell 4 and the inner hole of the outer shell 1. The bottom of the outer shell 1 is sealed with a cover plate 18 to ensure the sealing of the internal oil and prevent oil leakage from the outer shell 1. The sealing ring 3 serves as the boundary... Figure 1 The inner cavity of the middle outer shell 1 to the right of the sealing ring 3 and the inner cavity of the transmission housing 8 constitute the front cavity, while the inner cavity of the outer shell 1 to the left of the sealing ring 3 constitutes the rear cavity. The internal space of the device is filled with potting compound to completely fill any gaps in the internal space. This is used to fix and protect the internal components, to insulate the coil winding 5 from the outer shell 1, and to isolate the internal components from contact with air and oil.

[0025] The core assembly consists of a core sleeve 21, a core 22, and a connecting rod 23. The core 22 is mounted on the connecting rod 23 and is pressed against the connecting rod 23 by the core sleeve 21. The core assembly 14 is located inside the coil frame 12. The end of the connecting rod 23 away from the rear cover 2 is connected and fixed to the coupling 10 by a positioning pin 9, and then the coupling 10 is locked by a locking pin 11 to control the distance between the end face of the coupling 10 and the end face of the outer shell 1. A rolling bearing 7 is provided between the core assembly 14 and the sensing voltage part. The core assembly 14 is supported by the rolling bearing 7, and the core assembly 14 is axially limited by a baffle 17 and a retaining ring 6. The coupling 10 is the connecting component between this sensor device and the main unit (fuel pump regulator). The positioning pin 9, which passes between the coupling 10 and the connecting rod 23, is used for positioning to ensure the accuracy of the relative position of the device when it is installed on the main unit. The shift fork structure on the coupling 10 is inserted into the U-shaped groove of the main unit. When the main unit valve rotates, it drives the coupling 10 to rotate, and the coupling 10 drives the iron core assembly 14 to rotate.

[0026] The two sets of rolling bearings 7 are used to support and guide the iron core assembly 14. The outer diameter of the rolling bearings 7 is slightly larger than the outer diameter of the iron core 22 by 0.1mm to 1.0mm. This is to ensure that the iron core 22 will not contact or rub against the coil frame 12 when it rotates, thus ensuring that the iron core 22 will not be worn. This controls the magnetic properties of the iron core material (iron-nickel soft magnetic alloy) from decreasing due to wear, and also ensures the stability and high resolution of the device's performance output.

[0027] The baffle 17 is located on the outside of the rolling bearing 7 and is used to prevent the rolling bearing 7 from contacting the outside world, ensuring the cleanliness of the rolling bearing 7 and ensuring that the rolling bearing 7 can rotate without jamming for a long service life.

[0028] The baffle 17 and retaining ring 6 are installed in the axial direction. When the iron core assembly 14 is installed, there is one set of baffle 17, retaining ring 6 and rolling bearing 7 at the front and rear. The baffle 17 is installed in the limiting groove of the inner hole of the inner shell 4. The retaining ring 6 is set between the baffle 17 and the rolling bearing 7. The rolling bearing 7 is respectively set between the iron core sleeve 21 and the rear cover 2, and between the connecting rod 23 and the inner shell 4. The installation and combination of the above components form the rotating part of the device.

[0029] Saddle-shaped washer 16 is installed in Figure 1 Between the baffle 17 on the left side and the rolling bearing 7, the saddle-shaped washer 16 has a compression space of 0.2mm to 0.8mm, which can be used to eliminate the accumulated tolerances during the machining and assembly of axial components, thereby controlling the relative position of the induced voltage part and the rotating part, and ensuring the stability and consistency of the device's performance output.

[0030] The coil frame 12 has four waist-shaped holes distributed along the axial direction and spaced at 90° intervals: waist-shaped hole 1, waist-shaped hole 2, waist-shaped hole 3, and waist-shaped hole 4. The waist-shaped holes are through holes. Two waist-shaped holes that are arranged opposite each other have the same shape and size, while two adjacent waist-shaped holes have different shapes and sizes. Among them, waist-shaped hole 2 and waist-shaped hole 4 are arranged opposite each other, and waist-shaped hole 1 and waist-shaped hole 3 are arranged opposite each other.

[0031] The coil winding 5 consists of 4 sets of excitation coils, 4 sets of output coils, and 4 sets of constant coils. For example... Figure 3 As shown, two sets of excitation coils and two sets of constant coils are respectively installed in waist-shaped holes 1 and 3, and two sets of output coils are respectively installed in waist-shaped holes 2 and 4. The coil windings 5 ​​are composed of multi-turn copper wire bundles, with each excitation coil having approximately 400 turns, each output coil having approximately 200 turns, and each constant coil having approximately 10 turns. Each set of coil windings needs to undergo shaping, wrapping, adjustment, and potting processes to achieve the following requirements: consistent outer diameter of each coil winding; neat and orderly arrangement of coil windings; fixed placement of coil windings; symmetrical distribution of coils in each waist-shaped hole; symmetrical distribution of coils in opposite waist-shaped holes; good insulation between the coil windings and the coil frame 12; and consistent length of all coil windings extending beyond the coil frame 12. Shaping involves adjusting the shape of the coils using tooling or manual adjustment; wrapping refers to winding insulating material around the outer surface of the coils; adjustment involves adjusting the position and arrangement of each coil; and potting involves filling all gaps in the waist-shaped holes with filler. This ensures the stability, accuracy, resolution, sensitivity, and other characteristics of the device's performance output.

[0032] The slotted baffle 19 is installed at the inlet of the four oblong holes in the coil frame 12. The slotted baffle 19 is installed after all the copper wires of the coil winding 5 have been wound into the oblong holes. The slotted baffle 19 closes the oblong holes. Its functions are: first, to constrain the copper wires in the oblong holes; second, to facilitate the shaping, winding and adjustment of the coil winding 5; and third, to provide a certain degree of insulation.

[0033] The excitation coil, output coil, and constant coil group each pass through the corresponding oblong hole to form three voltage circuits: the excitation coil is the signal receiving end, the output coil is the electromagnetic induction end, and the constant coil is the adjustment end.

[0034] After the excitation coil receives the signal, the iron core 22 rotates, causing the output voltage of the output coil to change. The amount of rotational displacement of the iron core 22 is determined by the change in output voltage.

[0035] The core principle of this device is electromagnetic induction. When the iron core undergoes a 22° angular displacement, the output voltage changes. In principle, its resolution is infinite, limited only by the accuracy of the measuring device itself. This device can distinguish a 2″ angular displacement change under 360° angular displacement conditions and convert the change into an electronic signal fed back to the control system. Through operations such as shaping, winding, and adjusting 12 sets of coils, it can achieve an angular stroke output value with an accuracy higher than 0.8% of the theoretical value.

[0036] The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent transformations or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention. The technologies, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A high resolution angle measurement sensor, characterized by, The coil frame (12) has four holes spaced 90° apart along the axial direction for placing the coil windings (5). The coil windings (5) consist of four sets of excitation coils, four sets of output coils, and four sets of constant coils. Two sets of excitation coils and two sets of constant coils are respectively placed in two opposite holes, and two sets of output coils are respectively placed in the other two holes. The excitation coils are signal receiving ends, the output coils are electromagnetic induction ends, and the constant coils are adjustment ends. All coils form three voltage circuits. The iron core (22) is placed in the inner hole of the coil frame (12). After receiving the signal, the iron core (22) rotates, causing the output voltage of the output coil to change. The change in output voltage is used to determine the rotational displacement of the iron core (22). The iron core (22) is set on the connecting rod (23) and pressed onto the connecting rod (23) by the iron core sleeve (21). The connecting rod (23) is connected to the coupling (10). The shift fork structure on the coupling (10) is inserted into the U-shaped groove of the fuel pump regulator. When the valve of the fuel pump regulator rotates, it drives the coupling (10) to rotate. The coupling (10) drives the iron core assembly (14) to rotate.

2. A high resolution angular measurement sensor as claimed in claim 1, characterized in that The coil winding (5) is made of multiple turns of copper wire bundled together. The number of turns in a single group of excitation coil is about 400, the number of turns in a single group of output coil is about 200, and the number of turns in a single group of constant coil is about 10. Each group of excitation coil, output coil, and constant coil needs to be shaped, wrapped, adjusted, and potted to achieve the following: the outer diameter of each type of coil winding is consistent, the coil windings are arranged neatly and orderly, the coils in each hole used to place the coil winding (5) and the two opposite holes used to place the coil winding (5) are symmetrically distributed, the coil winding (5) is well insulated from the coil frame (12), and the length of all coil windings extending beyond the coil frame (12) is consistent.

3. A high resolution angular measurement sensor as claimed in claim 1, characterized in that The coil frame (12) is set in the cavity formed by the rear cover (2) and the inner shell (4), and the rear cover (2) and the inner shell (4) axially limit the coil frame (12). The rear cover (2) and the inner shell (4) are set in the outer shell (1), and the gaps between all parts in the outer shell (1) are filled with glue.

4. A high resolution angular measurement sensor as claimed in claim 3, characterized in that Rolling bearings (7) are provided between the connecting rod (23) and the inner shell (4), and between the iron core sleeve (21) and the rear cover (2). The inner holes of the inner shell (4) and the rear cover (2) are provided with baffles (17) for axially limiting the rolling bearings (7). A retaining ring (6) is provided between the baffle (17) and the rolling bearings (7).

5. A high resolution angular measurement sensor as claimed in claim 3, characterized in that A sealing ring (3) is provided between the outer shell (1) and the inner shell (4).

6. A high resolution angular measurement sensor as claimed in claim 4, characterized in that The outer diameter of the rolling bearing (7) is 0.1 mm to 1.0 mm larger than the outer diameter of the iron core (22).

7. A high resolution angular measurement sensor as claimed in claim 4, characterized in that A saddle-shaped washer (16) is provided between the retaining ring (6) and the rolling bearing (7), and the saddle-shaped washer (16) has a compression space of 0.2 mm to 0.8 mm.

8. A high resolution angular measurement sensor as claimed in claim 2, characterized in that, A slotted baffle is provided at the inlet of the hole used to place the coil winding (5).

9. A high resolution angular measurement sensor as claimed in claim 2, wherein, The holes used to place the coil winding (5) are all waist-shaped holes. The two opposite waist-shaped holes are the same in shape and size, while the two adjacent waist-shaped holes are different in shape and size.

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