Parallel bearingless bidirectional-rotation type standing wave type linear ultrasonic motor

Abstract

The invention provides a parallel bearingless double-rotation type standing wave type linear ultrasonic motor. The motor comprises a stator and a rotor; the rotor comprises an inner rotor and an outerrotor; the stator is arranged between the inner rotor and the outer rotor; the stator comprises a plurality of stator units and a squirrel cage type fixing structure; the stator unit comprises an elastic body, a left end piezoelectric ceramic and a right end piezoelectric ceramic; the elastic body is of an arc-shaped structure; the elastic bodies are positioned through the squirrel cage type fixing structure; the elastic bodies are arranged together to form a ring-shaped structure; the inner surface of the elastic body is provided with two inner driving feet; the inner driving feet contact with the inner rotor; the outer surface of the elastic body is provided with two outer driving feet; the outer driving feet contact with the outer rotor; and the inner driving feet and the outer drivingfeet reversely deviate from the standing wave node positions of the stator unit by the same radian. Compared with a currently popular linear ultrasonic motor, the motor of the invention has the advantages of compact structure, bearingless property, and bidirectional rotation of the inner rotor and the outer rotor.

Description

technical field [0001] The invention relates to a parallel bearingless double-rotation standing wave linear ultrasonic motor. Background technique [0002] There are two types of standing wave linear ultrasonic motors, one is a composite mode motor, and the other is a single mode motor. When the former works, there are two modes in the stator, so its structural design is relatively complicated. When the latter works, only one mode is used, so the design is relatively simple, but its driving direction is unidirectional. The stator structure of the standing wave linear ultrasonic motor is generally a straight line, and its output is also generally a straight line. [0003] At present, existing standing wave linear ultrasonic motors have the problems of relatively complicated structural design or difficulty in realizing bidirectional rotation. [0004] The above problems should be considered and solved in the design process of the standing wave linear ultrasonic motor. Cont...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a parallel bearingless double-rotation standing wave linear ultrasonic motor to solve the problems existing in the prior art or the structural design is relatively complicated, or it is difficult to realize two-way rotation

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