Rotary inertial piezoelectric actuator with built-in photoelectric encoder and its actuation method

Abstract

The invention relates to a rotary type inertia piezoelectric actuator with a built-in photoelectric encoder, and an actuation method of the same. The rotary type inertia piezoelectric actuator with a built-in photoelectric encoder is formed by a housing, an output shaft, actuation pieces, bearings, a code disc, a photoelectric detection assembly and a printed board, wherein the housing pedestal is provided with the output shaft through the bearing; the lower middle part of the output shaft is provide with a disc with a large section through integrated processing; the lower surface of the disc is pasted with the code disc; a photoelectric detection board and the printed board are fixed below the code disc; and the code disc, the photoelectric detection board and the printed board form a photoelectric encoder; a first actuation piece and a second actuation piece which are in interference fit with a piezoelectric stack are fixed on the inter side wall surface of the housing, and are distributed central-symmetrically with the shaft center point of the output shaft on the plane; and the bottoms of the first actuation piece and the second actuation piece are each provided with a friction foot which are closely pressed on the upper surface of the disc. The rotary type inertia piezoelectric actuator with a built-in photoelectric encoder is novel in structure and reliable in clamping, has the function of measuring the output angle in real time, and can efficiently and stably realize bidirectional rotation.

Description

technical field [0001] The invention belongs to the technical field of inertial piezoelectric actuators, and in particular relates to a rotary inertial piezoelectric actuator containing a photoelectric encoder and an actuating method. Background technique [0002] Inertial piezoelectric actuator is a kind of mechanism that adopts asymmetrical driving signal, asymmetrical mechanical clamping structure or asymmetrical friction force as the control mode, and forms the driving mechanism through inertial impact motion. [0003] Compared with other types of piezoelectric drives, inertial piezoelectric actuators have the main advantages of simple structure, fast response, high resolution, large stroke, fast movement speed, and low cost. positioning accuracy. Therefore, inertial piezoelectric actuators are suitable for occasions that require high resolution and large strokes. At present, scientific and technological workers have successfully applied inertial piezoelectric actuator...

AI Technical Summary

Problems solved by technology

[0004] Generally, rotary inertial piezoelectric actuators often use bimorphs as driving elements, which have complex structures and low strength; currently, most rotary inertial actuators only rely on line contact for clamping, which is easy to clamp due to surface wear. In addition, although most rotary inertial piezoelectric actuators can complete the output of the rotation angle, they cannot accurately measure the size of the output angle in real time

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