Three-degree-of-freedom high-precision drive device

Abstract

The invention discloses a three-degree-of-freedom high-precision driving device, which is applicable to various payloads (antennas, cameras, receivers, etc.) on a space vehicle to perform movements such as deployment, driving, scanning, and precise pointing. The three-degree-of-freedom high-precision driving device includes: an A-axis mechanism for driving pitching motion, a B-axis mechanism for driving steering motion, and a C-axis mechanism for driving unfolding motion. The A-axis machine can make the payload realize pitching and directional movement within the range of ±95°; the B-axis mechanism can make the payload realize the steering and directional movement within the range of ±185°; the C-axis mechanism can make the payload move within the range of 0°~90° It realizes deployment movement and directional tracking with directional antenna. The present invention adopts the integrated design technology, cleverly integrates the planetary gear reducer and the encoder inside the motor assembly, and designs a harmonic reducer and a motion limit device in each axis mechanism, so that the mechanism design is compact, light in weight, Movement is reliable. The invention solves the problem that the payload cannot be accurately aimed at the target, and achieves the beneficial effects of widening the viewing angle and improving the tracking precision.

Description

technical field The invention relates to the technical field of space vehicle driving devices, in particular to a high-precision driving device for three-degree-of-freedom motion. The device is suitable for carrying out movements such as deploying, driving, scanning, and precise pointing of various payloads on the spacecraft, including antennas, cameras, and receivers. Background technique At present, the domestically applied payload driving devices are single-degree-of-freedom driving devices, and there is no three-degree-of-freedom driving device similar to the present invention. The disadvantages of the single-degree-of-freedom driving device are mainly manifested in: a. It cannot meet the requirements of multi-degree-of-freedom driving of the payload, and usually requires the connection and combination of multiple single-degree-of-freedom driving devices to achieve the purpose of multi-degree-of-freedom driving. In this way, the size and weight of the mechanism increas...

AI Technical Summary

Problems solved by technology

a. It cannot meet the requirements of multi-degree-of-freedom driving of the payload, and usually requires the connection and combination of multiple single-degree-of-freedom driving devices to achieve the purpose of multi-degree-of-freedom driving. In this way, the size and weight of the mechanism increase accordingly, which brings launch costs increased;

b. It is not suitable for aircraft with high requirements for orbit change capability, such as aircraft orbit changes within a large range of 200-900km, of course, it also complicates the working mode of the attitude and orbit control system;

c. It is not suitable for the requirement that the payload needs to be adjusted arbitrarily, and its pointing accuracy is lower than 0.05°

In foreign countries, similar drive devices in the United States have been successfully applied to the drive of payloads on Mars rovers, but the range of rotation and pitch rotation angles of similar drive devices is small, and the deployment device adopts conic curve indirect deployment method, and its transmission chain is complicated; and The rotation angle range of its mechanism can only reach ±360°, and its rotation range has no overlapping area, which brings difficulties to signal, image and other information processing

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