Novel wireless transmission inertial measurement device

Abstract

The invention discloses a novel wireless transmission inertial measurement device, and belongs to the technical field of inertial measurement. The invention provides an overall design method of a novel wireless transmission inertial measurement device, provides a stacked shaft end motor control and drive circuit mounting structure, and provides a novel shaft end wireless transmission circuit mounting structure. The invention provides a wireless transmission inertial measurement device packaging structure based on a base, an upper cap cover, a lower cap cover, a side sealing cover, a shaft end sealing cover and a table body cover. The base of the inertial measurement device is integrally sealed, and the table body cover is reasonably arranged in the base, so that the problems of stabilizing an internal temperature field and isolating external electromagnetic environment interference are effectively solved; and the problem that the axial gap of the two wireless energy transmission circuit boards cannot be measured and accurately controlled due to the shielding of an external structural member when the two wireless energy transmission circuit boards are installed is solved.

Description

Technical Field

[0001] The invention relates to a novel wireless transmission inertial measurement device, belonging to the technical field of inertial measurement. Background Art

[0002] The main function of the inertial measurement device is to establish a navigation coordinate system that is independent of the angular motion of the missile (arrow) according to given technical indicators, and provide the necessary coordinate reference for the measurement of acceleration and attitude angle. The platform assembly of the inertial measurement device is a device that is stable relative to the inertial coordinate system, providing a stable inertial space for the inertial instrument. The internal and external communications of traditional inertial measurement devices are all achieved through mechanical slip ring conductive devices, which have cumbersome welding wires, complex structures, and are prone to generate interference (friction) torque and redundant objects, affecting the accuracy and reliability of product use. Summary of the invention

[0003] The technical problem solved by the present invention is: to overcome the shortcomings of the prior art and provide a novel wireless transmission inertial measurement device, which effectively solves the problems of stabilizing the internal temperature field and isolating the external electromagnetic environment interference by adopting an overall sealing method for the base of the inertial measurement device and reasonably installing a platform cover inside.

[0004] The technical solution of the present invention is: a novel wireless transmission inertial measurement device, comprising:

[0005] A rectangular base provides support for the fiber optic gyroscope platform assembly inside;

[0006] The fiber optic gyroscope cylindrical platform assembly is fixed in a rectangular base through a torque motor shaft end assembly and a grating angle sensor shaft end assembly, and can rotate 360 ​​degrees to provide high-precision attitude and position information;

[0007] Three stage assembly shielding covers are fixed on the cylindrical stage assembly of the fiber optic gyroscope respectively, and two convex trapezoidal caps, two square side sealing covers, and two shaft end sealing covers are fixed on the rectangular base respectively, forming a closed space together for electromagnetic shielding and maintaining a uniform and stable internal temperature field, providing a working environment for inertial instruments; the shaft end wireless communication module includes two wireless energy transmission circuit boards, which are fixed on both ends of the shaft end assembly of the grating angle sensor through two polyimide brackets respectively, and the wireless energy transmission circuit boards are used to realize wireless transmission of internal and external signals;

[0008] The brushless motor driving circuit board is fixed on the torque motor shaft end assembly through a brushless motor board bracket;

[0009] The brushless motor control circuit board is fixed on the torque motor shaft end assembly through a brushless motor board bracket;

[0010] The shaft end WiFi data circuit board is fixed on a rectangular base and is connected to the brushless motor drive and control circuit through cables.

[0011] Furthermore, the torque motor shaft end assembly is connected to the brushless motor drive board, the brushless motor drive circuit board and the brushless motor control circuit board are connected, and both are fixed on the brushless motor board bracket through insulating pads.

[0012] Furthermore, the shaft end wifi data circuit board is respectively connected to the brushless motor drive circuit board and the brushless motor control circuit board through cables; the grating angle sensor shaft end assembly is connected to the shaft end wifi data circuit board through cables.

[0013] Furthermore, the rectangular base, two outwardly convex trapezoidal caps, two square side sealing covers, two shaft end sealing covers, three platform component shielding covers, and the brushless motor plate bracket are all made of 2A12 aluminum alloy material.

[0014] Furthermore, the overall structural dimensions of the machine are: 224mm*270mm*300mm, and the weight is 12kg.

[0015] Furthermore, the grating angle sensor shaft end assembly adopts a dual-reading head grating ruler for real-time measurement of the rotation angle of the fiber optic gyroscope cylindrical stage assembly, and the measured angle information is transmitted internally and externally through the shaft end wireless communication module.

[0016] Furthermore, the magnetic cores of the two wireless energy transmission circuit boards are made of ferrite magnetic material, which are potted and reinforced with a polyimide bracket, and then installed relative to each other through the holes of the grating angle sensor shaft end assembly, with a spacing of 1 mm ± 0.1 mm.

[0017] Furthermore, the main body of the polyimide bracket is a circle with a diameter of 71 mm, a notch on one side, and a thickness of 2.5 mm; the central part is a cylindrical protrusion for encapsulating and reinforcing the magnetic core, with a height of 19.5 mm, a hollow interior, an inner diameter of 30 mm, and an outer diameter of 32 mm.

[0018] Furthermore, the torque motor shaft end assembly adopts a 90WLYR brushless torque motor with a thickness of 25 mm.

[0019] The advantages of the present invention compared with the prior art are:

[0020] (1) The present invention adopts a wireless communication-based method to realize the wireless transmission of all power signals and communication signals, replacing the traditional mechanical conductive device, and has the advantages of low power consumption, stable transmission performance, and small interference torque.

[0021] (2) The magnetic core of the wireless energy transmission circuit board of the present invention is made of ferrite magnetic material, which can maximize the magnetic flux density within a smaller working area and reduce energy transmission loss (compared with the same type of magnetic materials, its transmission efficiency can be increased from 90% to 94%).

[0022] (3) The present invention is an all-in-one integrated design with light weight and small size.

[0023] (4) Compared with the existing brushed torque motor of the same size, the 90-type brushless torque motor used in the present invention has a torque coefficient increased by 60%, and the torque fluctuation is reduced from 10% to 5%. At the same time, the interference torque is reduced, avoiding the motor reliability problem caused by brush wear.

[0024] (5) The present invention adopts an angle measurement device based on a grating sensor, using a metal grating instead of a glass grating, which greatly improves its structural strength and can meet the requirements of use under vibration, overload, and impact. Compared with traditional attitude angle sensors, its measurement accuracy is higher, from 15″ to 5″.

[0025] (6) The base of the present invention adopts a fully sealed design and a shielding cover is installed on the platform, which can provide good electromagnetic shielding and temperature environment for high-precision inertial instruments.

[0026] (7) The polyimide bracket used for wireless energy transmission circuit board installation of the present invention ensures the accurate positioning of the two wireless energy transmission circuit boards. During installation, the magnetic cores of the two wireless energy transmission circuit boards are potted and reinforced by the polyimide bracket, which ensures the mechanical strength and increases the normal operating temperature limit of the wireless energy transmission circuit board to 200°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0028] Figures 1 to 3 It is a central cross-sectional view of a novel wireless transmission inertial measurement device of the present invention;

[0029] Figure 4 It is a schematic diagram of the structural decomposition of a novel wireless transmission inertial measurement device of the present invention;

[0030] Figure 5 , 6 It is a top view and a three-dimensional schematic diagram of a novel wireless transmission inertial measurement device of the present invention after removing the cap;

[0031] Figure 7 , 8This is a view of the shaft end assembly of a grating (angle) sensor of a novel wireless transmission inertial measurement device of the present invention;

[0032] Fig. 9 This is a schematic diagram of a polyimide bracket for mounting a wireless energy transmission circuit board of a novel wireless transmission inertial measurement device of the present invention. DETAILED DESCRIPTION

[0033] In order to better understand the above technical scheme, the technical scheme of the present invention is described in detail below through the accompanying drawings and specific embodiments. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical scheme of the present invention, rather than limitations on the technical scheme of the present invention. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0034] The following is a further detailed description of a novel wireless transmission inertial measurement device provided by an embodiment of the present invention in conjunction with the accompanying drawings. Figures 1 to 3 The specific implementation method may include: a rectangular base, 2 convex trapezoidal caps, 2 square side sealing covers, 2 shaft end sealing covers, 3 platform assembly shielding covers, 1 torque motor circuit board bracket, 1 brushless torque motor shaft end assembly, 1 grating (angle) sensor shaft end assembly, a fiber optic gyroscope cylindrical platform assembly, 1 conductive device, 2 wireless energy transmission circuit boards, 1 shaft end wifi data board, 1 brushless motor drive circuit board and 1 brushless motor control circuit board, 1 brushless motor board bracket, and 1 annular conductive device adapter board. Among them, the fiber optic gyroscope cylindrical table assembly is fixed in a rectangular base through a torque motor shaft end assembly and a grating (angle) sensor shaft end assembly to rotate 360 ​​degrees; three table assembly shielding covers are respectively fixed on the fiber optic gyroscope cylindrical table assembly; two wireless energy transmission circuit boards are respectively fixed on the two ends of the grating (angle) sensor shaft end assembly through two polyimide brackets; a conductive device and a ring conductive device adapter plate are fixed on the torque motor shaft end assembly, and a brushless motor drive circuit board and a brushless motor control circuit board are respectively fixed on the torque motor shaft end assembly through a brushless motor board bracket; Figure 5 , 6 , 2 convex caps, 2 square side covers, 2 shaft end sealing covers, and 1 shaft end wifi data circuit board are fixed on the rectangular base.

[0035] In the above-mentioned novel wireless transmission inertial measurement device, the torque motor shaft end assembly is connected to the brushless motor drive board through a cable, and the brushless motor drive circuit board and the brushless motor control circuit board are connected through a cable and fixed on the brushless motor board bracket. The shaft end wifi data circuit board is connected to the brushless motor drive circuit board and the brushless motor control circuit board through cables respectively. The dual reading head grating sensor shaft end assembly is connected to the shaft end wifi data circuit board through a cable.

[0036] In the above-mentioned new type of wireless transmission inertial measurement device, the rectangular base, two convex trapezoidal caps, two square side sealing covers, three platform component shielding covers, and torque motor circuit board bracket are all made of 2A12 aluminum alloy. After the whole machine structure is assembled, the size envelope is: 224mm*270mm*300mm, and the weight is 12kg.

[0037] like Figure 7 , 8 In the above-mentioned new type of wireless transmission inertial measurement device, the angle sensor end uses a high-precision dual-reading head grating ruler, which can accurately measure the rotation angle of the platform. The angle measurement information is transmitted internally and externally through the shaft end wireless communication module. The shaft end wireless communication module consists of two wireless energy transmission circuit boards, which are installed opposite to each other, and the spacing is accurately controlled within 1mm±0.1mm. The bracket used for installing the wireless energy transmission circuit board is made of polyimide material, such as Fig. 9 , with the characteristics of high thermal stability, low thermal expansion coefficient, excellent dielectric properties, and radiation resistance.

[0038] In the above-mentioned novel wireless transmission inertial measurement device, the whole device is a mechatronic fiber optic gyroscope inertial measurement system based on "wired energy transmission and wireless signal transmission".

[0039] The difference between a novel wireless transmission inertial measurement device provided by the present invention and a traditional inertial measurement system is that: in the novel wireless transmission inertial measurement device of the present invention, an internal and external communication method based on a wireless transmission device and an angle measurement device based on a grating sensor are adopted, which changes the signal transmission mode of the traditional mechanical conductive device, reduces the shaft end interference torque and power consumption, and improves the angle measurement accuracy.

[0040] In the solution provided in the embodiment of the present invention, Figures 1 to 3 The central cross-sectional view of the novel wireless transmission inertial measurement unit is shown. Figure 4It is a schematic diagram of the structural decomposition of a new type of wireless transmission inertial measurement device. As can be seen from the figure, a new type of wireless transmission inertial measurement device includes a rectangular base 1, 2 convex trapezoidal caps, 2 square side sealing covers, 2 shaft end sealing covers, 3 platform assembly shielding covers, 1 torque motor circuit board bracket, 1 brushless torque motor shaft end assembly, 1 dual reading head grating sensor shaft end assembly, a fiber optic gyroscope cylindrical platform assembly, 1 conductive device, 2 wireless energy transmission circuit boards, 1 shaft end wifi data board, 1 brushless motor drive circuit board and 1 brushless motor control circuit board, 1 brushless motor board bracket, and 1 annular conductive device adapter plate. Among them, the fiber optic gyroscope cylindrical table assembly 2 is fixed in a rectangular base 1 for 360° rotation through a brushless torque motor shaft end assembly 6 and a dual-reading head grating sensor shaft end assembly 7; three table assembly shielding covers 18, 19, and 20 are respectively fixed on the fiber optic gyroscope cylindrical table assembly 2; two wireless energy transmission circuit boards 8 are respectively fixed at both ends of the dual-reading head grating sensor shaft end assembly 7 through two polyimide brackets 11; a conductive device 9 and a ring-shaped conductive device adapter plate 10 are fixed on the torque motor shaft end assembly 6, and a brushless motor drive circuit board 16 and a brushless motor control circuit board 17 are respectively fixed on the torque motor shaft end assembly 6 through a brushless motor board bracket 12; two convex caps, two square side covers, two shaft end sealing covers, and a shaft end wifi data circuit board 13 are fixed on the rectangular base 1.

[0041] The torque motor shaft end assembly 6 is connected to the brushless motor drive board 16 through a cable, and the brushless motor drive circuit board 16 and the brushless motor control circuit board 17 are connected through a cable and fixed on the brushless motor board bracket 12. The shaft end wifi data circuit board 13 is connected to the brushless motor drive circuit board 16 and the brushless motor control circuit board 17 through a cable. The grating angle sensor shaft end assembly 7 is connected to the shaft end wifi data circuit board 13 through a cable.

[0042] The rectangular base 1, two convex trapezoidal caps 5, two square side sealing covers 14, three platform component shielding covers 18, 19, 20, and the brushless motor board bracket 12 are all made of 2A12 aluminum alloy. After the whole machine structure is assembled, the size envelope is: 224mm*270mm*300mm, and the weight is 12kg.

[0043] In the present invention, the whole machine is a high-precision fiber optic gyroscope inertial measurement system based on wired energy transmission, wireless signal transmission and mechatronics layout.

[0044] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0045] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A wireless transmission inertial measurement device, characterized in that: include: A rectangular parallelepiped base (1) provides support for the fiber optic gyroscope platform assembly inside; The fiber optic gyroscope cylindrical platform assembly (2) is fixed in a rectangular parallelepiped base (1) through a torque motor shaft end assembly (6) and a grating angle sensor shaft end assembly (7) so as to rotate 360 ​​degrees and provide high-precision attitude and position information; Three platform assembly shielding covers (18, 19, 20) are respectively fixed on the fiber optic gyroscope cylindrical platform assembly (2); two outwardly convex trapezoidal caps (4, 5), two square side sealing covers (14), and two shaft end sealing covers (5) are respectively fixed on the rectangular parallelepiped base (1), and together form a closed space for electromagnetic shielding and maintaining a uniform and stable internal temperature field, thereby providing a working environment for the inertial instrument; the shaft end wireless communication module includes two wireless energy transmission circuit boards (8) which are respectively fixed on the two ends of the grating angle sensor shaft end assembly (7) through two polyimide brackets (11); the wireless energy transmission circuit boards are used to realize wireless transmission of internal and external signals; A brushless motor drive circuit board (16) is fixed on the torque motor shaft end assembly (6) via a brushless motor board bracket (8); A brushless motor control circuit board (17) is fixed on the torque motor shaft end assembly (6) via a brushless motor board bracket (8); The shaft end WiFi data circuit board (13) is fixed on the rectangular parallelepiped base (1) and is connected to the brushless motor drive and control circuit via a cable.

2. A wireless transmission inertial measurement device according to claim 1, characterized in that: The torque motor shaft end assembly (6) is connected to the brushless motor drive board (16), and the brushless motor drive circuit board (16) and the brushless motor control circuit board (17) are connected, and both are fixed on the brushless motor board bracket (12) through insulating pads.

3. A wireless transmission inertial measurement device according to claim 1, characterized in that: The shaft end WiFi data circuit board (13) is respectively connected to the brushless motor drive circuit board (16) and the brushless motor control circuit board (17) via cables; the grating angle sensor shaft end assembly (7) is connected to the shaft end WiFi data circuit board (13) via cables.

4. The wireless transmission inertial measurement device according to claim 1, characterized in that: The rectangular base (1), two outwardly convex trapezoidal caps (3, 4), two square side sealing covers (14), two shaft end sealing covers (5), three platform component shielding covers (18, 19, 20), and a brushless motor plate bracket (8) are all made of 2A12 aluminum alloy material.

5. The wireless transmission inertial measurement device according to claim 1, characterized in that: The overall structural dimensions of the machine are: 224mm*270mm*300mm, and the weight is 12kg.

6. A wireless transmission inertial measurement device according to claim 1, characterized in that: The grating angle sensor shaft end component (7) adopts a dual-reading head grating ruler and is used to measure the rotation angle of the fiber optic gyroscope cylindrical platform component (2) in real time, and the measured angle information is transmitted internally and externally through the shaft end wireless communication module.

7. The wireless transmission inertial measurement device according to claim 1, characterized in that: The magnetic cores of the two wireless energy transmission circuit boards (8) are made of ferrite magnetic material, which are potted and reinforced with a polyimide bracket and then installed relative to each other through the holes of the grating angle sensor shaft end assembly (7), with a spacing of 1 mm±0.1 mm.

8. The wireless transmission inertial measurement device according to claim 1, characterized in that: The main body of the polyimide bracket is a circle with a diameter of 71mm, a notch on one side, and a thickness of 2.5mm; the central part is a cylindrical protrusion for encapsulating and reinforcing the magnetic core, with a height of 19.5mm, a hollow interior, an inner diameter of 30mm, and an outer diameter of 32mm.

9. The wireless transmission inertial measurement device according to claim 1, characterized in that: The torque motor shaft end assembly (6) adopts a 90WLYR brushless torque motor with a thickness of 25 mm.

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