The proposed device includes two segments adapted to enclose a body part in a form-fitting manner. Each segment contains an electroactive-material-based actuator, which is adapted to receive an electrical control signal and in response thereto adjust the actuator's morphology, so as to cause the segment to apply a basic pressure profile to the body part. A pressure transition is adapted to redistribute the basic pressure profiles between the first and second segments. A control signal in respect of the first segment causes the pressure transition system to apply a first adjusted pressure profile to at least part of the second portion of the body part, and vice versa, a control signal in respect of the second segment causes the pressure transition system to apply a second adjusted pressure profile to at least a part of the first portion of the body part.

Electro active compression bandage

A device for compressive treatment of a body part includes a compression member, adapted to at least partly encircle the body part, and an actuation unit, arranged to tighten the compression member to provide a compressive force to the body part. Methods are provided for its therapeutic, cosmetic and non-therapeutic use and operation.

Device, System and Method for Compression Treatment of a Body Part

A new geometrically unique ultrasonic motor (USM) was designed, prototyped, and tested. USMs operate by vibrating a drive tip in an elliptical motion while in periodic contact with a driven surface. Piezoelectric elements are used to create the elliptical motions and are driven at near resonance frequencies to create the needed displacements for the motor to operate. The motor in this article consists of an arched frame, a center ground, and two piezoelectric elements connected to the center ground. Several finite element models were developed to design the motor and to predict performance. The models predicted a linear motor capable of pushing up to 5 N and a maximum speed of 0.4 m/s. A prototype frame was built out of tool steel and run against an oxide ceramic plate. The prototype motor achieved a maximum speed of 55.6 mm/s and a push force of 0.348 N at a preload of 6 N. The prototype frame’s steady-state displacements were approximately 20% of the expected output from the finite element models. Reaso...

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Design of a Linear Ultrasonic Piezoelectric Motor

Piezoelectric ceramics of the formula Pb(1-z)MZ (Mg1/3Nb2/3) x (ZryTi1-y) 1-xΟ3 where M can be either Sr or Ba or both, and x is between 0.3 and 0.6, y is between 0.2 and 0.5, and z is between 0.04 and 0.08. The piezoelectric ceramic is provided as a composite perovskite structure, and may additionally include materials or dopants such as: PbO, HfO2, TeO2, WO3, V2O5, CdO, Tm2O3, Sm2O3, Ni2O3, and MnO2. The piezoelectric ceramics can be used to fabricate piezoelectric elements for a wide variety of devices that can be fabricated to exhibit high power applications including miniaturized displacement elements, buzzers, transducers, ultrasonic sensors and ultrasonic generators, and the like.

Compositions for high power piezoelectric ceramics

The invention relates to a linear ultrasound piezoelectric motor comprising a mobile element (4) that is in frictional contact with a rectangular resonance plate (11). The frictional surface (18) is embodied by means of at least one of the longitudinal narrow sides of the resonance plate. Said piezoelectric motor also comprises electrodes (7) 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.

Linear ultrasound motor

The invention relates to a piezoelectric adjusting element, in particular a piezoelectric motor in the form of a monolithic plate-shaped or cylindrical piezoelectric oscillator comprised of a first and of a second kind of main surfaces and of groups of electrodes that are allocated to them, comprised of a housing, a driven element, at least one friction layer arranged on the housing or on the driven element, a driving element that is connected to an electric excitation source and that is in friction contact with the friction layer, and the piezoelectric oscillator is excited by way of the groups of electrodes [to form] standing longitudinal acoustic waves in the direction of an oscillator resonant length and in the direction of an oscillator resonant height of this piezoelectric oscillator, and the oscillator resonant length is equal to an integral multiple of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant height is equal to one half of the wave length of the standing longitudinal wave that vibrates in its direction, and the oscillator resonant length as well as the oscillator resonant height are chosen in such a way that the frequencies of the standing longitudinal acoustic waves expanding through the piezoelectric oscillator are equal both in the direction of the oscillator resonant length as well as in the direction of the oscillator resonant height.

Piezoelectric adjusting element

A piezoelectric adjusting motor has a friction layer on a casing (1) and/or a driven element (3) and a driving element (5) in frictional contact with this layer and linked to an electrical exciter source. A piezoelectric oscillator is excited by groups of electrodes with longitudinal acoustic waves towards the oscillator's resonance length and height.

Piezoelectric positioning element

Piezoelectric adjusting motor for applying greater force with less exciter voltage, comprises monolithic plate-like/cylindrical piezoelectric oscillator with first and second types of main surfaces with groups of electrodes.

Wladimir Dr. Wischnewskiy

Papers

Piezoelectric adjusting element

Piezoelectric positioning element

Piezoelectric adjusting motor for applying greater force with less exciter voltage, comprises monolithic plate-like/cylindrical piezoelectric oscillator with first and second types of main surfaces with groups of electrodes.