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Linear ultrasound motor

A piezoelectric motor and ultrasonic technology, applied in the direction of piezoelectric devices/electrostrictive devices, etc., can solve the problems of abandoning ball bearings, the non-magnetic application of motors, etc., and achieve the effect of improving efficiency and improving functional stability

Active Publication Date: 2007-08-15
PHYSIK INSTR PI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the easy-to-think abandonment of ball bearings is problematic
Another problem exists in implementing the ball bearings with magnetic material such that such motors cannot be used in non-magnetic applications

Method used

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Embodiment Construction

[0039] As shown in FIG. 1 , the electric motor according to the invention comprises an ultrasonic oscillator 1 which is located in a support 3 via a vibration-damping mount. Furthermore, the moving element 4 is shown in frictional contact with the oscillator. The ultrasonic oscillator 1 comprises a rectangular resonance plate 5 and one or two generators 6 for generating acoustic vibrations.

[0040] In principle, two structural variants of the electric motor according to the invention are possible.

[0041] In a first embodiment, the resonance plate 5 is entirely made of piezoelectric material, for example lead-titanate-zirconate (Blei-Titanat-Zirkonat), barium-titanate (Barium-Titanat), crystalline quartz, niobate Lithium (Lithium-Niobat) or similar piezoelectric material.

[0042] Each acoustic vibration generator 6 comprises an excitation electrode 7 ( FIG. 1 ) and a common back electrode 8 . These two electrodes are situated on the longitudinal wide faces 9 and 10 of th...

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Abstract

The invention relates to a linear ultrasound piezoelectric motor comprising a mobile element that is in frictional contact with a rectangular resonance plate. The frictional surface is embodied by means of at least one of the longitudinal narrow sides of the resonance plate. Said piezoelectric motor also comprises electrodes which are used to generate acoustic vibrations, and are arranged on the longitudinal wide sides of the resonance plate. According to the invention, the generator for producing acoustic vibrations is asymmetrically arranged in relation to a plane which symmetrically cross-cuts the resonance plate, and comprises two opposing electrodes generating a stationary asymmetrical space wave when excited.

Description

technical field [0001] The invention relates to a linear ultrasonic piezoelectric motor according to the preamble of claim 1, which has a moving element in frictional contact with a plate-shaped rectangular resonance plate, wherein the friction surface is embodied by at least one longitudinal narrow face of the resonance plate, and has Electrodes for generating acoustic vibrations are arranged on the longitudinal wide surface of the resonance plate. Background technique [0002] A linear ultrasonic motor is known from US Pat. No. 4,978,882, which operates on the principle of piezoelectric excitation in a ring oscillator as a closed waveguide. Such electric motors have a very complex construction, in which a plurality of piezo elements are attached to the ring oscillator, for example by gluing. Consequently, such motors are very expensive to manufacture and can only be miniaturized to a limited extent. [0003] According to US patent 5672930, this prior art consists of an u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L41/09H10N30/20
Inventor 沃拉迪米尔·韦什纽斯基阿里克斯·韦什纽斯基
Owner PHYSIK INSTR PI