Longitudinal and flexural composite transducer type double cylinder-shaped traveling wave ultrasonic motor vibrator

Abstract

A longitudinal and flexural composite transducer type double cylinder-shaped traveling wave ultrasonic motor vibration generator belongs to the technical field of a piezoelectric ultrasonic motor. The invention aims at solving the problems that the mechanical output capacity of an ultrasonic motor is restricted when the method that metal elastic body pastes a piezoelectric ceramic sheet is adopted for excitation by the existing ultrasonic motor vibration generator, vibration path distortion of vibration generator surface particle caused by the condition that multi-transducer can not be guaranteed to be completely consistent when the multi-transducer are adopted to drive simultaneously and the mechanical output capacity and maneuverability of the ultrasonic motor are reduced. The inventioncomprises a longitudinal and flexural composite sandwich transducer and two cylinders, the small end face of a front end cover of the longitudinal and flexural composite sandwich transducer is made into a whole with a cylinder, the big end face of the front end cover thereof is respectively connected with one end of a screw stud, a longitudinal vibration piezoelectric ceramic plate and a flexuralvibration piezoelectric ceramic plate respectively are sheathed on the screw stud with electrode plates in an interval manner, and the other end of the screw stud is connected with a flange. The traveling wave ultrasonic motor vibrator is applicable to the manufacturing field of the ultrasonic motor.

Description

technical field [0001] The invention relates to a longitudinal bending compound transducer type double-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 pressure 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 passes through the stator and rotor. Frictional 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 i...

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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 stretching vibration mode of the ceramic sheet along the length direction. Due to the low tensile strength of the material in this vibration mode and the low electromechanical coupling efficiency 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 transducer-type vibrators, it is difficult to ensure that each vibrator 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

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