Power-off maintaining three-degree-of-freedom piezoelectric directional adjustment device and platform control method

Abstract

The invention discloses a power-off maintaining three-degree-of-freedom piezoelectric directional adjustment device and platform control method, and relates to a piezoelectric driving adjustment device and method. The device comprises a platform, a base and three or four adjustment mechanisms, wherein each adjustment mechanism comprises an ejector rod, a driving mechanism, a braking mechanism and a supporting body; the upper end of the ejector rod is fixed to the platform, a universal flexible hinge is machined on the ejector rod and located between the upper portion of the supporting body and the platform, and the supporting body is fixed to the base. The method comprises the steps: 1, assembling the adjusting mechanism, the platform and the base; 2, relieving the self-locking state of the ejector rod; 3, enabling the adjustment device to control the platform to achieve three-degree-of-freedom adjustment. The device is compact in structure, is used in a space environment, is stable and reliable in operation, can realize three-degree-of-freedom adjustment of the platform, and can meet the application requirements of the space environment.

Description

technical field [0001] The invention relates to a piezoelectric drive adjustment device and method, in particular to a power-off maintaining three-degree-of-freedom piezoelectric pointing adjustment device and a platform control method, belonging to the field of piezoelectric precision drive. Background technique [0002] With the rapid development of science and technology, there is an urgent need for ultra-precision positioning and pointing mechanisms in the fields of optics, semiconductors, and mechanical processing, especially in the space field. At present, deep space exploration, laser communication, and laser ranging are developing rapidly. The high-precision pointing of the platform is an important Indicators often need to use a high-precision pointing adjustment mechanism to adjust the platform pointing. [0003] There are two main forms of pointing adjustment mechanism at present, one is the pointing adjustment mechanism driven by the transmission motor, and the ot...

AI Technical Summary

Problems solved by technology

Driven by a traditional motor, the entire mechanism is bulky, the transmission chain is long, the control is complex, and the weight is heavy, which is not conducive to the application to the space field that requires small weight and small volume.

The patent application with the publication number CN109889084A proposes a piezoelectric-driven ultra-precision feed and attitude adjustment device and its excitation method. The driving platform of this invention application cannot achieve power-off maintenance after the attitude adjustment, and the piezoelectric drive unit needs Always energize to keep the adjusted platform position and angle unchanged, which will reduce the life of the piezoelectric device; the patent application with the publication number CN108054512A proposes a high-torque anti-jamming antenna pointing mechanism for deep space exploration. It is necessary to use the brake to energize and output the holding torque to realize the holding of the mechanism, but it cannot realize self-locking when the power is off; the patent application with the application number 201710583870. One-stage lever amplification, the micro-displacement magnification is limited, resulting in the limitation of the output external rotation angle range, and the lever mechanism is an asymmetric structure, which has a high requirement for the position layout of the piezoelectric stack, which has a key impact on the magnification

It can be seen that the adjustable angle range of the existing piezoelectric drive mechanism is small, and it needs to be powered on all the time during work, without the self-locking function when power is off, resulting in waste of electric energy.

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