Abstract: The invention relates to a piezoelectric ultrasound motor with an oscillator in the form of a piezoelectric plate of the length L and the height H as well as with one or two friction elements which are arranged at the oscillator and elastically pressed against the friction surface of the part to be moved. According to the invention, the piezoelectric plate is divided into two identical parts by a section plane extending vertically to the large surfaces, with at least one of these parts including an asymmetrical generator of an asymmetrical acoustic standing wave, which upon its activation generates an asymmetrical two-dimensional standing wave, so that the friction elements which are arranged in the center of the long end face of the plate carry out a movement with an inclination relative to the end face, so that the energy of motion is transferred to the element to be moved.

Abstract: The invention relates to a miniaturizable motor (1) comprising a rotor (12) that is driven by a hollow cylindrical piezo oscillator (2). Said rotor is effectively connected to a frictional face (13) of the piezo oscillator while a main electrode or counter electrode (3) and excitation electrodes (4, 5, 6) are disposed on the surface of the hollow cylinder. The hollow cylindrical piezo oscillator is made of a monocrystalline material with a trigonal crystal system which is provided with three main electrical axes that are placed at a 120° angle relative to each other as well as an optical axis. Said optical axis encloses a 90° angle along with the point of intersection of the electrical axes while coinciding with the longitudinal axis of the hollow cylindrical piezo oscillator. Furthermore, the axial axis of symmetry of the respective excitation electrode intersects one of the main electrical axes while said axial axis of symmetry extends parallel to the optical axis.

Abstract: The invention relates to a piezoelectric ultrasound motor with an oscillator in the form of a piezoelectric plate of the length L and the height H as well as with one or two friction elements which are arranged at the oscillator and elastically pressed against the friction surface of the part to be moved. According to the invention, the piezoelectric plate is divided into two identical parts by a section plane extending vertically to the large surfaces, with at least one of these parts including an asymmetrical generator of an asymmetrical acoustic standing wave, which upon its activation generates an asymmetrical two-dimensional standing wave, so that the friction elements which are arranged in the centre of the long end face of the plate carry out a movement with an inclination relative to the end face, so that the energy of motion is transferred to the element to be moved.

Abstract: The invention relates to a method for operating a piezoelectric motor having a stator in the form of a hollow-cylindrical oscillator, the at least one front side of which has frictional contact with a rotor and which comprises standing wave generators. According to the invention the hollow cylinder is set into a coupled tangential-axial oscillation mode so that the cylinder mainly has tangential and axial oscillatory components. The oscillatory speed maximums of the tangential components are formed on the front sides of the hollow cylinder and those of the axial components directly underneath thereof, wherein the components decrease towards the center of the cylinder height and, in the center of the cylinder height, substantially parallel to the front sides, a nodal line is formed on which the axial oscillatory component adopts the value zero and the tangential components adopt a minimum.

Abstract: The invention relates to a method and a circuit arrangement for the precise, dynamic, digital control of especially piezoelectric actuators for micropositioning systems, comprising a regulator, whereby in order to minimise position order deviations the future system behaviour is estimated and current correction signals for the purpose of a feedforward correction are obtained. According to the invention, the signal of the command variable is passed via a switchable bypass to a digital/analog converter with highest resolution for the purpose of reducing the latency times in the feedforward loop of the sampling system, with said converter being operated at the sampling rate of the sampling system. The feedforward loop leads to a fast digital/analog converter which is controlled independent of the sampling system.

Abstract: The invention relates to a method for operating a piezoelectric motor having a stator in the form of a hollow-cylindrical oscillator, the at least one front side of which has frictional contact with a rotor and which comprises standing wave generators. According to the invention the hollow cylinder is set into a coupled tangential-axial oscillation mode so that the cylinder mainly has tangential and axial oscillatory components. The oscillatory speed maximums of the tangential components are formed on the front sides of the hollow cylinder and those of the axial components directly underneath thereof, wherein the components decrease towards the center of the cylinder height and, in the center of the cylinder height, substantially parallel to the front sides, a nodal line is formed on which the axial oscillatory component adopts the value zero and the tangential components adopt a minimum.

Abstract: A piezo linear drive including a group of piezo actuator stacks configured to drive a moving member located in a guidance device, and located on a joint substrate in a hybrid arrangement; wherein within a stack extending from the substrate a first stack part is configured as a longitudinal actuator and a second stack part is configured as a shearing actuator, the second stack part is equipped with a wear-resistant end plate which is in at least one of a clamping contact and shearing contact with the moving member, and at least two identical motors are located adjacent to each other in order to perform alternating clamping and advancing movements during a stepping operation.

Abstract: 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 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 t

Abstract: The invention relates to a circuit arrangement for the dynamic control of ceramic solid-state actuators, such as piezotranslators with energy recovery by means of magnetic intermediate stores and/or storage capacitors as well as by clocked switches. For achieving a predetermined linear voltage characteristic at the piezotranslator, according to the invention, a single inductive intermediate store is arranged in the secondary circuit, which is connected in series with the piezotranslator, and the secondary circuit is designed as a half-bridge. The switches provided in the respective half-bridge are controlled at a high cycle or switching frequency by an external controller, with the series connection of piezotranslator and inductive intermediate store furthermore carrying a superimposed bridge direct current in order to ensure the desired charging of the capacitance of the piezotranslator, on the one hand, and to optimize the energy recovery, on the other hand.

Abstract: A piezo linear drive including a group of piezo actuator stacks configured to drive a moving member located in a guidance device, and located on a joint substrate in a hybrid arrangement; wherein within a stack extending from the substrate a first stack part is configured as a longitudinal actuator and a second stack part is configured as a shearing actuator, the second stack part is equipped with a wear-resistant end plate which is in at least one of a clamping contact and shearing contact with the moving member, and at least two identical motors are located adjacent to each other in order to perform alternating clamping and advancing movements during a stepping operation.

Abstract: 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

Abstract: The invention relates to an arrangement for the temperature-compensated multi-dimensional micropositioning of mutually position-defined optical components, comprising a guide unit for housing the optical components as well as several piezo actors.