Thin reverse type ultrasonic motor

Abstract

The invention discloses a thin reverse type ultrasonic motor. Vertical and radial vibration generated by piezoelectric ceramic sheets can be converted into torsional oscillation modal of a waveguide structure in a stator, and a rotor can be made to realize a high rotation speed through the torsional oscillation modal. The thin reverse type ultrasonic motor comprises a rotation shaft (1), wherein the rotation shaft (1) penetrates through a slot pad (2), a spring (3), the rotor (5) and the stator (6), the slot pad (2) is fastened on the rotation shaft (1) through a key slot on the rotation shaft (1), the piezoelectric ceramic sheets are attached to upper and lower surfaces of the stator (6), the rotor (5) is driven to rotate by the stator (6) through friction, the stator (6) is internally connected with the waveguide structure, and the waveguide structure comprises uniformly-distributed spoked beams in a tangent relationship with a center cylinder. The thin reverse type ultrasonic motor is suitable for the precise driving and transmission technology field.

Description

technical field [0001] The invention relates to the technical field of precision drive and transmission, in particular to a sheet-type torsional ultrasonic motor. Background technique [0002] The ultrasonic motor is a piezoelectric motor, which uses the inverse piezoelectric effect of the material to convert electrical energy into the vibration energy of the stator of the ultrasonic motor, and then converts the vibration into the planar or spatial motion of the mover through friction. In micro-flying robots, DC motors are mainly used as drive motors. Studies have shown that with the size of miniaturized DC motors, the Joule heat loss increases sharply, and the contradiction between the performance and quality of DC motors makes it no longer suitable for more applications. Tiny aircraft. Compared with the traditional electromagnetic motor, the ultrasonic motor has a compact structure, high energy density, and is easy to miniaturize; the motor has fast response speed, good p...

AI Technical Summary

Problems solved by technology

Torsional motors can be divided into two categories, modal conversion type and non-modal conversion type; among them, the piezoelectric ceramic sheet structure of the non-modal conversion longitudinal torsion motor is complex, easily damaged and the cost is too high

However, there are problems in the mode-converting longitudinal torsion motor, such as the chute type longitudinal torsion ultrasonic motor, which cannot adjust the direction of rotation, the ceramic stack generates serious heat, and the energy conversion efficiency is low.

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