Cantilever longitudinal-bending composite transducer type cylindrical traveling-wave ultrasonic motor vibrator

Abstract

The invention relates to a cantilever longitudinal-bending composite transducer type cylindrical traveling-wave ultrasonic motor vibrator belonging to the technical field of piezoelectric ultrasonic motors and solving the problems that the mechanical output capability of a motor is restricted because the prior ultrasonic motor vibrator adopts a metal elastic body to bond piezoelectric ceramic thinplates to excite, and the mechanical output capability and the controllability of an ultrasonic motor are lowered because a plurality of transducers are simultaneously driven. The cantilever longitudinal-bending composite transducer type cylindrical traveling-wave ultrasonic motor vibrator comprises a cylinder and a cantilever longitudinal-bending composite sandwich transducer which are connectedinto a whole by two cantilevers, a fastening screw is fixedly screwed with a rear end cover after passing through central through holes of a front end cover and the two cantilevers, four longitudinalvibration piezoelectric ceramic plates are arranged between the two cantilevers, two pairs of bending vibration piezoelectric ceramic plates are respectively arranged between the front end cover andthe first cantilever and between the rear end cover and the second cantilever, and the adjacent bending vibration piezoelectric ceramic plates and the adjacent longitudinal vibration piezoelectric ceramic plates have opposite polarization directions. The cantilever longitudinal-bending composite transducer type cylindrical traveling-wave ultrasonic motor vibrator is used for the field of manufacturing ultrasonic motors.

Description

technical field [0001] The invention relates to a cantilever longitudinal bending composite transducer type cylindrical traveling wave ultrasonic motor vibrator, which belongs to the technical field of piezoelectric ultrasonic motors. Background technique [0002] Ultrasonic motor is a motor that uses ultrasonic vibration energy to generate driving force through frictional coupling. It uses the inverse piezoelectric effect of piezoelectric ceramics to excite vibrations in the ultrasonic frequency range in the elastic body, and then forms a particle motion with a specific trajectory at a specific point or area on the surface of the elastic body, and then through the friction between the stator and the rotor Coupling converts the microscopic motion of the particle into the macroscopic motion of the rotor. Ultrasonic motor is widely used as a piezoelectric driver because of its advantages such as low speed and high torque, no need for speed change mechanism, no electromagnetic...

AI Technical Summary

Problems solved by technology

[0003] Due to the simplicity of the excitation principle and the simplicity of the theoretical analysis method, most of the vibrators of piezoelectric ultrasonic motors are excited by the method of pasting piezoelectric ceramic sheets with metal elastomers. This excitation method uses piezoelectric ceramic d 31 vibration mode, d 31 The vibration mode is the mode of stretching vibration of the ceramic sheet along the length direction. Due to the low tensile strength of the material in this vibration mode and the low efficiency of electromechanical coupling for energy conversion, and the limitation of the strength and fatigue life of the adhesive layer, the ultrasonic motor The mechanical output capability is severely restricted; for a piezoelectric ultrasonic motor driven by multiple transducers, it is difficult to ensure that each transducer is completely consistent in the process of processing, pasting, and assembly, resulting in differences in vibration characteristics, which in turn cause The distortion of the particle vibration track on the surface of the vibrator also reduces the mechanical output capability and controllability of the ultrasonic motor

Images