A high-precision angular displacement sensor convenient to disassemble and maintain

Abstract

The application discloses a high-precision angular displacement sensor convenient to disassemble and maintain, which comprises a shell, a rotor assembly, a stator core and a coil assembly installed in the shell, characterized in that a supporting framework is further installed in the shell, the supporting framework is arranged outside the rotor assembly, and the supporting framework and the rotor assembly are coaxially arranged, the stator core and the coil assembly are installed on the outer surface of the supporting framework, and the stator core and the coil assembly are coaxially arranged with the rotor assembly. In the application, the product precision and the detection precision are improved, the maintenance difficulty is reduced, the maintenance convenience is improved, and the maintenance cost is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to an angular displacement sensor, in particular to a high-precision angular displacement sensor convenient to disassemble and maintain. BACKGROUND

[0002] The angular displacement sensor is a type of displacement sensor, adopts a non-contact type patent design, and compared with a synchronous analyzer and a potentiometer and other traditional angular displacement measuring instruments, long-term reliability is effectively improved. The angular displacement sensor is a measurement of converting angle measurement into other physical quantities, adopts a non-contact type patent design, and compared with a synchronous analyzer and a potentiometer and other traditional angular displacement measuring instruments, long-term reliability is effectively improved. The angular displacement sensor is used to measure the change of the angle, and the change of the angle is measured through the change of the electric signal.

[0003] In the prior art, the stator core in the angular displacement sensor is directly installed on the inner wall of the shell in a fixed manner such as bonding. When the stator core has a problem during subsequent use, the stator core and the shell are disassembled, and the shell is easily damaged. In general, normal repair cannot be performed, and only replacement can be performed. In this way, the cost is relatively high. At the same time, the coaxiality of the inner wall of the shell and the rotor assembly is not good, the coaxiality of the stator core and the rotor assembly is not good, and the detection accuracy is not good. Moreover, the coil framework is directly sleeved on the outside of the rotor assembly, and after being used for a period of time, the coil framework and the rotor assembly are loose, the coil framework shakes in the inside, and the detection accuracy is affected. SUMMARY

[0004] The application aims to provide a high-precision angular displacement sensor convenient to disassemble and maintain. Through the use of the structure, the detection accuracy of the angular displacement sensor can be improved, maintenance and disassembly are facilitated, and the maintenance cost can be reduced.

[0005] To achieve the above object, the technical scheme adopted by the application is as follows: a high-precision angular displacement sensor convenient to disassemble and maintain comprises a shell, a rotor assembly installed in the shell, a stator core and a coil assembly, a support framework is further installed in the shell, the support framework is arranged on the outside of the rotor assembly, the support framework and the rotor assembly are coaxially arranged, the stator core and the coil assembly are installed on the outer surface of the support framework, and the stator core and the coil assembly are coaxially arranged with the rotor assembly.

[0006] In the above technical scheme, a gap is arranged between the outer wall of the stator core, the outer wall of the coil assembly and the inner wall of the shell.

[0007] In the above technical solution, the housing is a hollow structure with an open rear end. The housing has a cavity inside, and the rear end of the cavity is connected to the rear end of the housing. An end cap is installed at the rear end of the housing to close the rear end of the cavity. The middle part of the rotor assembly, the stator core, the coil assembly, and the support frame are installed inside the cavity.

[0008] In the above technical solution, the support frame is a ring structure, the middle part of the support frame is provided with a through cavity coaxially arranged with the support frame, the middle part of the rotor assembly is inserted into the through cavity, and the rotor assembly is coaxially arranged with the through cavity, and there is a gap between the rotor assembly and the inner wall of the through cavity.

[0009] In the above technical solution, a first through hole is provided at the center of the front end of the housing, and the front end of the rotor assembly passes through the first through hole and is disposed outside the front end of the housing; a second through hole is provided in the middle of the end cover, and the rear end of the rotor assembly is installed in the second through hole, and the first through hole and the second through hole are coaxially arranged.

[0010] In the above technical solution, the front wall of the cavity is provided with a first extension ring extending toward the rear end of the cavity. The first extension ring is disposed outside the first through hole and is coaxially disposed with the first through hole. The front end of the end cap is provided with a second extension ring. The second extension ring is disposed outside the second through hole and is coaxially disposed with the second through hole. The two ends of the support frame are respectively sleeved on the first extension ring and the second extension ring. The inner wall of the front end of the cavity is tightly fitted with the outer wall of the first extension ring, and the inner wall of the rear end of the cavity is tightly fitted with the outer wall of the second extension ring.

[0011] In the above technical solution, a first annular protrusion is provided on the front outer surface of the support frame. The first annular protrusion is integral with the support frame. The front end of the stator core abuts against the rear end face of the first annular protrusion. The coil assembly is disposed at the rear end of the stator core, and the front end face of the coil assembly abuts against the rear end face of the stator core. A frame retaining ring is also provided on the rear outer surface of the support frame, and the front end face of the frame retaining ring abuts against the rear end face of the coil assembly.

[0012] In the above technical solution, the skeleton retaining ring is bonded to the outer surface of the supporting skeleton.

[0013] In the above technical solution, the coil assembly includes a coil frame and a coil wound around the outside of the coil frame. The coil frame is sleeved on the outer surface of the support frame. The front end face of the coil frame abuts against the rear end face of the stator core, and the frame retaining ring abuts against the rear end face of the coil frame.

[0014] In the above technical solution, the supporting frame is an integrally formed structure.

[0015] Due to the application of the above-mentioned technical solution, the present invention has the following advantages compared with the prior art:

[0016] 1. In this invention, by setting a support frame inside the housing, the stator core and coil assembly are directly mounted on the support frame. This can effectively ensure the coaxiality of the stator core and coil assembly with the rotor assembly, improve the detection accuracy, and at the same time facilitate the disassembly and maintenance of the stator core, thereby reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure in Embodiment 1 of the present invention.

[0018] The components are: 1. Housing; 2. Rotor assembly; 3. Stator core; 4. Support frame; 5. Cavity; 6. End cap; 7. Wire hole; 8. Through cavity; 9. First through hole; 10. Second through hole; 11. First extension ring; 12. Second extension ring; 13. First annular protrusion; 14. Frame retaining ring; 15. Coil frame. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Example 1: See Figure 1 As shown, a high-precision angular displacement sensor that is easy to disassemble and maintain includes a housing 1, a rotor assembly 2, a stator core 3, and a coil assembly installed inside the housing. A support frame 4 is also installed inside the housing. The support frame is located outside the rotor assembly and is coaxially arranged with the rotor assembly. The stator core and the coil assembly are installed on the outer surface of the support frame, so that the stator core and the coil assembly are coaxially arranged with the rotor assembly.

[0021] In this embodiment, the support frame and rotor assembly are coaxially arranged, and the stator core and coil assembly are installed on the outside of the support frame. This further ensures the coaxiality of the stator core and coil assembly with the rotor assembly, thereby improving the detection accuracy of the angular displacement sensor. Simultaneously, by directly installing the stator core on the outer surface of the support frame, if the stator core is damaged and requires repair, it can be directly removed from the support frame for repair or replacement, effectively improving the convenience of repair and replacement and reducing maintenance costs. Moreover, compared to the previous method of bonding the stator core to the inner wall of the housing, installation is more convenient and faster. Furthermore, the previous bonding method often resulted in uneven adhesive thickness, leading to insufficient coaxiality between the stator core and rotor assembly. Therefore, in this embodiment, direct installation on the outside of the support frame ensures coaxiality and improves the accuracy of the angular displacement sensor.

[0022] Meanwhile, compared with the previous method of installing the stator core on the inner wall of the housing and the coil assembly directly on the outside of the rotor assembly, this method can ensure that the stator core and coil assembly are installed in place, avoiding the impact of improper installation in the past (poor product accuracy, poor detection accuracy, or easy damage).

[0023] See Figure 1 As shown, a gap is provided between the outer wall of the stator core and the outer wall of the coil assembly and the inner wall of the housing. In this embodiment, during assembly, the support frame and the rotor assembly do not interfere with each other and do not affect their installation. At the same time, the gap between the outer wall of the stator core and the outer wall of the coil assembly and the inner wall of the housing allows for easy disassembly and maintenance. The support frame can be directly removed from the housing, or the coil assembly and stator core can be directly removed from the support frame without being restricted by the housing.

[0024] See Figure 1 As shown, the housing is a hollow structure with an open rear end. A cavity 5 is provided inside the housing, and the rear end of the cavity is connected to the rear end of the housing. An end cap 6 is installed at the rear end of the housing, closing the rear end of the cavity. The middle part of the rotor assembly, the stator core, the coil assembly, and the support frame are installed within the cavity. The end cap is used to seal the cavity of the housing, limiting the movement of the rotor assembly, support frame, stator core, and coil assembly inside the housing. The end cap also has a wire hole 7 through which the wire connects to the coil assembly.

[0025] See Figure 1As shown, the support frame is a ring structure, and a through cavity 8 is provided in the middle of the support frame and coaxially arranged with the support frame. The rotor assembly is inserted into the through cavity in the middle and is coaxially arranged with the through cavity. There is a gap between the rotor assembly and the inner wall of the through cavity.

[0026] The front end of the housing has a first through hole 9 at its center, and the front end of the rotor assembly passes through the first through hole and is disposed outside the front end of the housing; the end cap has a second through hole 10 in its middle, and the rear end of the rotor assembly is installed in the second through hole, and the first through hole and the second through hole are coaxially arranged.

[0027] The front wall of the cavity is provided with a first extension ring 11 extending toward the rear end of the cavity. The first extension ring is disposed outside the first through hole and is coaxially disposed with the first through hole. The front end of the end cap is provided with a second extension ring 12. The second extension ring is disposed outside the second through hole and is coaxially disposed with the second through hole. The two ends of the support frame are respectively sleeved on the first extension ring and the second extension ring. The inner wall of the front end of the cavity is tightly fitted with the outer wall of the first extension ring, and the inner wall of the rear end of the cavity is tightly fitted with the outer wall of the second extension ring.

[0028] In this embodiment, the first and second through holes serve as bearing mounting holes. Bearings are located at both ends of the rotor assembly, and are installed in the corresponding first and second through holes. This allows the rotor in the middle of the rotor assembly to rotate through the bearings, housing, and end cap. The first and second extension rings are coaxially arranged with the corresponding first and second through holes, meaning they are coaxial with the bearings in the rotor assembly. This ensures that the support frame, after installation, is coaxial with the rotor assembly, guaranteeing the accuracy and detection precision of the angular position sensor. During support frame installation, the front end of the support frame is inserted into the cavity of the housing, with the cavity directly aligned with the first extension ring, which is then fitted onto it. When the end cap is installed, the second extension ring is inserted into the cavity, and the end cap abuts against the rear end of the support frame. The front inner wall of the cavity abuts against the rear end of the support frame. The first and second extension rings fit tightly with the support frame, ensuring a secure and stable installation without any wobbling.

[0029] See Figure 1As shown, a first annular protrusion 13 is provided on the front outer surface of the support frame. The first annular protrusion is integral with the support frame. The front end of the stator core abuts against the rear end face of the first annular protrusion. The coil assembly is disposed at the rear end of the stator core, and the front end face of the coil assembly abuts against the rear end face of the stator core. A frame retaining ring 14 is also provided on the rear outer surface of the support frame, and the front end face of the frame retaining ring abuts against the rear end face of the coil assembly.

[0030] In this embodiment, the first annular protrusion and the frame retaining ring can restrict the degree of freedom of movement of the stator core and coil assembly along the axis of the support frame. During installation, the stator core is first inserted into the rear end of the support frame. After the front end of the stator core contacts the first annular protrusion, the coil assembly is then placed on the support frame, and the frame retaining ring is installed on the support frame to limit the position of the stator core and coil assembly.

[0031] The retaining ring is bonded to the outer surface of the supporting frame. This prevents the retaining ring from moving backward along the supporting frame, providing a stable limiting function. For disassembly, simply heat the retaining ring with a heat gun; the bonded area will then loosen, allowing for removal.

[0032] The coil assembly includes a coil frame 15 and a coil (not shown in the coil diagram) wound around the outside of the coil frame. The coil frame is sleeved on the outer surface of the support frame. The front end face of the coil frame abuts against the rear end face of the stator core, and the frame retaining ring abuts against the rear end face of the coil frame.

[0033] In conventional designs, the coil bobbin is directly mounted outside the rotor assembly. However, the fit between the two sets is often not tight enough, causing the coil bobbin to wobble on the rotor assembly. This leads to collisions and wear, affecting both lifespan and accuracy. In this embodiment, the coil bobbin is directly fitted over the support frame and is positioned to prevent wobble in the coil assembly. Simultaneously, the stator core and the inner wall of the coil bobbin are in contact or have a tight fit, ensuring no relative rotation or wobble during use and guaranteeing accuracy.

[0034] The support frame is a one-piece molded structure. This provides good structural strength and facilitates manufacturing.

Claims

1. A high-precision angular displacement sensor that is easy to disassemble and maintain, comprising a housing, a rotor assembly, a stator core, and a coil assembly installed within the housing, characterized in that: A support frame is also installed inside the housing. The support frame is disposed outside the rotor assembly and is coaxial with the rotor assembly. The stator core and the coil assembly are mounted on the outer surface of the support frame, so that the stator core and the coil assembly are coaxial with the rotor assembly. A gap is provided between the outer wall of the stator core and the outer wall of the coil assembly and the inner wall of the housing; The housing is a hollow structure with an open rear end. A cavity is provided inside the housing. The rear end of the cavity is connected to the rear end of the housing. An end cap is installed at the rear end of the housing to close the rear end of the cavity. The middle part of the rotor assembly, the stator core, the coil assembly, and the support frame are installed inside the cavity. The support frame is a ring structure, and a through cavity is provided in the middle of the support frame and coaxially arranged with the support frame. The rotor assembly is inserted into the middle of the through cavity and coaxially arranged with the through cavity. A gap is provided between the rotor assembly and the inner wall of the through cavity. The front end of the housing has a first through hole at its center, and the front end of the rotor assembly passes through the first through hole and is disposed outside the front end of the housing; the end cap has a second through hole in its middle, and the rear end of the rotor assembly is installed in the second through hole, and the first through hole and the second through hole are coaxially arranged. The front wall of the cavity is provided with a first extension ring extending toward the rear end of the cavity. The first extension ring is disposed outside the first through hole and is coaxially disposed with the first through hole. The front end of the end cap is provided with a second extension ring. The second extension ring is disposed outside the second through hole and is coaxially disposed with the second through hole. The two ends of the support frame are respectively sleeved on the first extension ring and the second extension ring. The inner wall of the front end of the cavity is tightly fitted with the outer wall of the first extension ring, and the inner wall of the rear end of the cavity is tightly fitted with the outer wall of the second extension ring.

2. The high-precision angular displacement sensor that is easy to disassemble and maintain according to claim 1, characterized in that: The front outer surface of the support frame is provided with a first annular protrusion, which is integral with the support frame. The front end of the stator core abuts against the rear end face of the first annular protrusion. The coil assembly is disposed at the rear end of the stator core, and the front end face of the coil assembly abuts against the rear end face of the stator core. The rear outer surface of the support frame is also provided with a frame retaining ring, and the front end face of the frame retaining ring abuts against the rear end face of the coil assembly.

3. The high-precision angular displacement sensor that is easy to disassemble and maintain according to claim 2, characterized in that: The skeleton retaining ring is bonded to the outer surface of the supporting skeleton.

4. The high-precision angular displacement sensor that is easy to disassemble and maintain according to claim 2, characterized in that: The coil assembly includes a coil frame and a coil wound around the outside of the coil frame. The coil frame is sleeved on the outer surface of the support frame. The front end face of the coil frame abuts against the rear end face of the stator core, and the frame retaining ring abuts against the rear end face of the coil frame.

5. The high-precision angular displacement sensor that is easy to disassemble and maintain according to claim 1, characterized in that: The supporting frame is a one-piece molded structure.

Images