Sandwich I-shaped four-footed linear ultrasonic motor vibrator

Abstract

The invention relates to a sandwich I-shaped four-footed linear ultrasonic motor vibrator, belonging to the technical field of piezoelectric ultrasonic motors. The sandwich I-shaped four-footed linear ultrasonic motor vibrator provided by the invention eliminates various adverse impacts caused by coupling bending vibration in the traditional rectangular four-footed linear ultrasonic motor vibrator. The sandwich I-shaped four-footed linear ultrasonic motor vibrator comprises two horizontal compound beams and one vertical compound beam, wherein the two horizontal compound beams and the vertical compound beam are arranged in an I shape, piezoelectric ceramic wafers on the horizontal compound beam and the vertical compound beam are respectively excited by adopting two-phase voltage, stretching vibration of the piezoelectric ceramic wafers is used for exciting two vibration modes during vibration, the two vibration modes are superposed onto four driving feet, namely terminals of four horizontal amplitude transformers, surface material points of the driving feet generate an elliptic motion trail, and when the four driving feet and an active cell at the two sides of the four driving feet are contacted under certain pre-pressure, macroscopic motion output of the active cell is realized by virtue of friction coupling between the driving feet and the active cell. The sandwich I-shaped four-footed linear ultrasonic motor vibrator provided by the invention is applicable to manufacturing of ultrasonic motors.

Description

technical field [0001] The invention relates to a sandwich-type I-shaped quadruped linear ultrasonic motor vibrator, which belongs to the technical field of piezoelectric ultrasonic motors. Background technique [0002] Piezoelectric ultrasonic motor is a kind of piezoelectric ultrasonic motor that uses the inverse piezoelectric effect of piezoelectric ceramics to excite vibration in the ultrasonic frequency range in the elastic body, and forms a particle motion with a specific trajectory at a specific point or area on the surface of the elastic body, and then passes through the stator, The friction coupling between the rotors converts the microscopic motion of the particle into the macroscopic motion of the rotor. It has the advantages of low speed and high torque, no need for speed change mechanism, no electromagnetic interference, fast response speed and self-locking when power is off. Electric drives, piezoelectric ultrasonic motors have a very wide range of applications...

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Problems solved by technology

[0003] Chinese patent "Rectangular Quadruped Linear Ultrasonic Motor Vibrator", the publication number is CN101626205A, and the publication date is January 13, 2010. It proposes a new configuration of a sandwich-type linear ultrasonic motor with a closed structure. The arranged longitudinal vibration transducer realizes the excitation of the four driving foot elliptical trajectory vibrations; however, there is an obvious vibration coupling problem between the transducers in the ultrasonic motor vibrator, so that the actual vibration state of the transducer is not single The longitudinal vibration is a composite vibration of the superposition of longitudinal vibration and bending vibration; among them, the longitudinal vibration is generated by the active excitation of the piezoelectric ceramic sheet, while the bending vibration is caused by the coupling between adjacent transducers The existence of this coupling-induced bending vibration will make the modal characteristic frequency of the vibrator deviate from the resonance frequency of a single transducer, and will reduce the electromechanical conversion efficiency of the vibrator and limit the improvement of the mechanical output characteristics of the vibrator

In addition, the existence of this coupled bending vibration makes the vibration trajectories of the four driving feet obviously inconsistency, which is not conducive to the improvement of its output characteristics.

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