Ultrasonic motor vibrator with plate cantilever beam combined structure and excitation method thereof

Abstract

The invention discloses an ultrasonic motor vibrator with a plate cantilever beam combined structure and an excitation method thereof, and the vibrator comprises piezoelectric ceramic pieces which are divided into first piezoelectric ceramic pieces and second piezoelectric ceramic pieces, and also comprises an elastic plate and two elastic cantilever beams. First piezoelectric ceramic pieces are fixed to the two opposite side faces perpendicular to the side face in the thickness direction of the elastic plate correspondingly, elastic cantilever beams are connected to the other two opposite side faces perpendicular to the side face in the thickness direction of the elastic plate correspondingly, and the two elastic cantilever beams are symmetrically arranged. The two opposite surfaces of each elastic cantilever beam are respectively and fixedly provided with a second piezoelectric ceramic piece, the first piezoelectric ceramic pieces and the second piezoelectric ceramic pieces are arranged in parallel, a mounting hole is formed in the symmetry axis of the elastic plate, and a friction material layer is arranged on the end face of each elastic cantilever beam. The vibrator is compact in structure, has the characteristic of bidirectional driving, and can be applied to a use environment with strict spatial size requirements.

Description

technical field [0001] The invention relates to an ultrasonic motor vibrator and an excitation method thereof, in particular to an ultrasonic motor vibrator with a plate cantilever beam composite structure and an excitation method thereof. Background technique [0002] Ultrasonic Motor (USM for short) is a kind of electric energy that can be input from the outside through the inverse piezoelectric effect of the piezoelectric material into the vibration energy of the stator of the motor, and then the vibration of the stator through the friction between the stator and the mover. A new type of motor that can be converted into mechanical energy of the mover. There are two types of traveling waves and standing waves. Among them, the standing wave ultrasonic motor has the advantages of flexible structure, high conversion efficiency, and easy miniaturization. However, the vibrator of this standing wave motor usually uses two same or different vibration modes to realize the ellipt...

AI Technical Summary

Problems solved by technology

However, the vibrator of this standing wave motor usually uses two same or different vibration mode combinations to realize the elliptical vibration of the driving foot. The nodes of these two different vibration modes are not easy to overlap or rotate, and it is difficult to fix

In addition, in order to maintain the consistency of the two modal frequencies, some standing wave motor vibrators are designed with large width and thickness, and the structure is relatively complex, which is difficult to achieve miniaturization, which is not conducive to the application in narrow and thin fields with strict space requirements.

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