Dust-proof traveling wave type ultrasonic motor pre-loaded rotor system

Abstract

A dust-proof traveling wave type ultrasonic motor pre-loaded rotor system comprises a center shaft, a motor shell, a rotor, and a gland. The motor shell and the rotor sequentially sleeve the center shaft, and the motor shell and the rotor are arranged concentrically. The gland is arranged on the top of the center shaft. The surface of the rotor is provided with a preloading point, and the gland contacts the preloading point. The rotor is gradually thinned from center to outside to generate elastic deformation. By using the pre-loaded rotor system, the output stalling torque and no-load speed of motors are increased by more than 50%, the output performance of traveling wave type ultrasonic motors is improved greatly, and solutions are provided for more applications. Moreover, the pre-loaded rotor system has the advantages of simple processing technology and good contact between a stator drive surface and a rotor friction interface.

Description

technical field [0001] The invention relates to a dust-proof traveling wave ultrasonic motor pre-pressure rotor system, which belongs to the field of ultrasonic motors. Background technique [0002] Ultrasonic motor is a new concept of micro motor. It uses the inverse piezoelectric effect of the piezoelectric material to excite the elastic body to vibrate slightly in the ultrasonic frequency range, and convert it into the rotation (linear) of the rotor (mover) through the friction between the stator and the rotor (mover) sports. In 1983, Japan's Sashida proposed and manufactured a traveling wave ultrasonic motor, which realized the conversion from standing wave fixed point and regular pushing of the rotor to continuously pushing the rotor by traveling waves, which greatly reduced the friction on the contact surface between the stator and the rotor. wear and tear. The traveling wave type rotary ultrasonic motor is pasted with a piezoelectric ceramic element on one side of ...

AI Technical Summary

Problems solved by technology

[0003] 1. The internal variable interface annular structure of the rotor has complex processing technology, high processing difficulty and low yield;

[0004] 2. When pressure is applied to the center of the rotor, the contact part between the outer end of the rotor and the stator of the motor is prone to warping, and it is difficult for the rotor friction interface to fully contact the stator driving surface. Usually, only part of the friction interface is in contact with the stator driving surface;

[0005] 3. Due to the incomplete contact of the friction interface, the output performance of the motor is low

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