Orthogonal transducer type cylindrical traveling-wave ultrasonic motor vibrator

Abstract

The invention relates to an orthogonal 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 elastomer to bond piezoelectric ceramic thin plates to excite, and the mechanical output capability and the controllability of an ultrasonic motor are reduced because a plurality of transducers are driven simultaneously. The orthogonal transducer type cylindrical traveling-wave ultrasonic motor vibrator comprises a cylinder and an orthogonal transducer, wherein the orthogonal transducer is formed by orthogonally connecting amplitude rods of a first transducer and a secondtransducer into a whole, both sides of each transducer flange are respectively connected with screw posts which are respectively screwed with the amplitude rods and a rear end cover, the screw posts among the flange, the amplitude rods and the rear end cover are respectively sleeved with piezoelectric ceramic plates and electrode plates, insulating sleeves are arranged among the piezoelectric ceramic plates, the electrode plates and the screw posts, and a plurality of comb-shaped driving teeth are evenly distributed on the inner wall of the cylinder along a circumferential direction. The orthogonal 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 positive 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 interference, fast response spee...

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

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