Vertical-bending-twisting compound rotary type ultrasonic motor piezoelectric vibrator

Abstract

The invention relates to a vertical-bending-twisting compound rotary type ultrasonic motor piezoelectric vibrator, and belongs to the technical field of ultrasonic motor manufacture. The vibrator is formed by bimorph cantilever beams (1, 2), a piezoelectric stacking-metal compound elastic beam (3), a mass block (4), a circuit contactor (5) and a base (6). The bimorph cantilever beams (1, 2) are arranged at the left side and the right side of the mass block (4) respectively. The piezoelectric stacking-metal compound elastic beam (3) is arranged at the lower end of the mass block (4) and is connected with the base (6). The bimorph cantilever beams (1, 2), the piezoelectric stacking-metal compound elastic beam (3) and the mass block (4) form a T-shaped structural in space. The reverse bending vibration of the bimorph cantilever beams (1, 2) is used and the upward and downward longitudinal vibration of the piezoelectric stacking-metal compound elastic beam (3) is used for enabling the mass points on the surface of the circuit contactor (5) to generate elliptic motion tracks, and the twisting drive to a rotor is realized.

Description

technical field [0001] The invention relates to a longitudinal-bending-torsion composite rotary ultrasonic motor piezoelectric vibrator, which can realize precise driving and positioning functions, and belongs to the technical field of ultrasonic motor manufacturing. technical background [0002] The ultrasonic motor uses the inverse piezoelectric effect of piezoelectric ceramics to convert electrical energy into the vibration of the motor stator, and then drives the motor rotor to rotate (or linearly) through the frictional coupling between the motor stator and rotor. Ultrasonic motors have the advantages of compact structure, low speed and high torque, fast response, good control characteristics, no electromagnetic interference, high positioning accuracy, low noise, and can directly drive loads. They are widely used in national defense, military, industry, medical treatment and national production. various fields of life. [0003] There are many patent applications at hom...

AI Technical Summary

Problems solved by technology

[0003] There are many patent applications at home and abroad involving piezoelectric ultrasonic motors and piezoelectric vibrators. The typical structure of piezoelectric ultrasonic motor vibrators is mainly circular, longitudinal torsion composite and other mechanisms. These piezoelectric vibrators have complex structures and cumbersome processing techniques, such as circular Dozens of tooth-like structures are processed on the surface of the piezoelectric vibrator of the traveling-wave ultrasonic wave, and the longitudinal-torsion compound ultrasonic motor is designed with a complex structure of the piezoelectric vibrator to tune the frequency consistency of the longitudinal vibration mode and the torsional vibration mode

In addition, the longitudinal vibration mode and torsional vibration mode of the motor are difficult to control independently, which makes the design of the motor drive controller cumbersome and complicated

The complex structure of the piezoelectric vibrator makes it difficult to miniaturize the above-mentioned ultrasonic motor, which is not conducive to the application in fields with strict space requirements (such as micro-drive technology)

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