Multi-degree-of-freedom piezoelectric actuator based on piezoelectric stacks as well as working method

Abstract

The invention discloses a multi-degree-of-freedom piezoelectric actuator based on piezoelectric stacks as well as a working method and relates to the technical field of piezoelectric actuators. The multi-degree-of-freedom piezoelectric actuator can realize a rotation motion of three degrees of freedom on the basis of a single stator and is simple and compact in structure. The multi-degree-of-freedom piezoelectric actuator comprises a stator, piezoelectric stacks and a spherical rotor, wherein the interior of the stator is hollow, and the top of the stator is tightly connected with the spherical rotor; four piezoelectric stacks are arranged in total, a polarization direction is upward in the vertical direction, the piezoelectric stacks are placed in the inner cavity of the stator side by side and in pairs, thus a piezoelectric stack square matrix is formed, and the piezoelectric stack square matrix is tightly connected with the stator; and the symmetry center of the piezoelectric stacksquare matrix is coincided with a projection, in the vertical direction, of the center of the spherical rotor. The multi-degree-of-freedom piezoelectric actuator disclosed by the invention can be usedfor replacing a multi-degree-of-freedom piezoelectric actuator scheme with a more complex structure and a larger size in an existing scheme and has a broad application prospect in the high-precisionfields of micromachines, optical instruments, aerospace, medicine and the like.

Description

technical field [0001] The invention relates to the technical field of piezoelectric actuators, in particular to a piezoelectric stack-based multi-degree-of-freedom piezoelectric actuator and a working method. Background technique [0002] Piezoelectric actuators are widely used in aerospace, industry, medicine and other fields, especially in recent years, with the rise of piezoelectric stacks, stacked piezoelectric actuators are due to their large displacement, large thrust, low The characteristics of voltage drive are widely used in various fields. [0003] In many current schemes, the piezoelectric actuator based on the piezoelectric stack still has the defect of insufficient displacement of the output line. In order to amplify the displacement, it must be equipped with a corresponding displacement amplification device, which will undoubtedly lead to a complex structure of the actuator and a large volume. Huge; since piezoelectric stacks can only output linear displaceme...

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Problems solved by technology

[0003] In many current schemes, the piezoelectric actuator based on the piezoelectric stack still has the defect of insufficient displacement of the output line. In order to amplify the displacement, it must be equipped with a corresponding displacement amplification device, which will undoubtedly lead to a complex structure of the actuator and a large volume. Huge; since piezoelectric stacks can only output linear displacement, there are few rotary actuators based on piezoelectric stacks, and even fewer multi-degree-of-freedom rotary actuators based on piezoelectric stacks; currently, piezoelectric stack-based Most of the multi-free rotating actuators adopt the scheme of multi-stator combination, which will undoubtedly lead to a large volume of the whole actuator, which undoubtedly limits the application of piezoelectric actuators based on piezoelectric stack schemes in aerospace, medical and other high-level applications. Applications in the precision field

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