In-plane modal circumferential traveling wave rotary type ultrasonic motor

Abstract

The invention discloses an in-plane modal circumferential traveling wave rotary type ultrasonic motor belonging to the technical field of ultrasonic motors. The in-plane modal circumferential traveling wave rotary type ultrasonic motor comprises a vibrator and a rotor, wherein the rotor is arranged on the inner side of the vibrator; a pre-tightening mechanism which can adjust pre-tightening forceis arranged between the vibrator and the rotor; the vibrator comprises a piezoelectric ceramic ring and a metal elastic body, wherein the metal elastic body is arranged at the inner side of the piezoelectric ceramic ring and is in the shape of a thin round platform, and the contact area of the vibrator and the rotor is in the shape of a round platform. The invention has large output torque, smallaxial volume and reliable work.

Description

technical field [0001] The invention relates to the technical field of ultrasonic motors, in particular to an in-plane mode circumferential traveling wave rotary ultrasonic motor. Background technique [0002] The ultrasonic motor is a new type of motor. It uses the inverse piezoelectric effect of piezoelectric materials to make the surface particles of the stator vibrate on the order of microns in a certain trajectory, and then converts the vibration kinetic energy into the rotational kinetic energy of the rotor through friction coupling. Compared with electromagnetic motors, ultrasonic motors have some obvious advantages, such as low speed and high torque, direct drive without deceleration mechanism, no gear gap, high positioning accuracy, high efficiency at high torque density, self-holding torque, and small inertia , fast response, no noise in operation, no magnetic interference and strong anti-magnetic interference ability, simple structure, easy processing, easy miniat...

AI Technical Summary

Problems solved by technology

[0003] In the existing rotary ultrasonic motors, the out-of-plane bending vibration mode is mainly combined into end-face traveling waves, and the rotor is driven to rotate. The common problems are small driving torque, large axial volume, and wear difference between the inner and outer diameter contact areas of the stator and rotor. In addition, even if the in-plane vibration mode is adopted, in order to apply the in-plane radial preload, the disc or ring of the vibrator or rotor is made into two semi-discs or semi-circles, and the middle passes through Springs are connected into discs or rings to apply in-plane radial preload. At present, it is difficult to achieve large torque, and the work reliability is low.

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