Hollow bimodal composite piezoelectric actuator and working method thereof

Abstract

The invention discloses a hollow bimodal composite piezoelectric actuator and a working method thereof. The hollow bimodal composite piezoelectric actuator comprises a hollow piezoelectric transducer, a fixing frame assembly and a pre-pressure applying device. The hollow piezoelectric transducer comprises a circular base body, a plurality of rectangular piezoelectric ceramic pieces and a plurality of fan-shaped piezoelectric ceramic pieces. And a first rotating shaft, a second rotating shaft, a first actuating head and a second actuating head are arranged on the outer normal of the outer ring of the circular base body. Based on the working method provided by the invention, the hollow piezoelectric transducer can rotate around the first rotating shaft under the pushing of kinetic friction force, and has a rotational degree of freedom. The hollow structure not only facilitates weight reduction, but also can be used as a channel for light, wires and pipelines, so that the external output motion forms of the hollow piezoelectric actuator are enriched, and the hollow piezoelectric actuator has wide application prospects in the aspects of light path adjustment and the like of space optical instruments.

Description

technical field [0001] The invention relates to a hollow dual-mode composite piezoelectric actuator and a working method thereof, belonging to the field of piezoelectric actuators and ultrasonic motors. Background technique [0002] The existing hollow ultrasonic motor is mainly driven by the combination of two out-of-plane isomorphic orthogonal bending vibration modes of the circular stator. The hollow structure inside it can act as a channel for light, wires and pipelines, and is widely used in telescopes. The adjustment of the diaphragm aperture, the adjustment of the focal length of the SLR camera lens and the auxiliary manipulation of the medical guide wire catheter. Because the working vibration mode used by the hollow ultrasonic motor is relatively fixed, the movement form of the rotor is relatively simple. At present, it can only rotate around the rotating shaft passing through the center of the circular stator and perpendicular to the circular stator. [0003] The ...

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Problems solved by technology

Because the working vibration mode used by the hollow ultrasonic motor is relatively fixed, the movement form of the rotor is relatively simple. At present, it can only rotate around the rotating shaft that passes through the center of the circular stator and is perpendicular to the circular stator.

[0003] The adjustment of the optical path in space optical instruments requires the circular lens to rotate around its diameter. Due to the limitation of the external output motion form, the existing hollow ultrasonic motor can only be arranged at the diameter of the circular lens for driving, which undoubtedly loses the advantages of the hollow structure.

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