Abstract: A linear or rotary table is provided which can be moved in two dimensions having a stator and at least one upper slider plate movable relative to the stator in two independent translational directions or two independent rotary directions, and at least two piezoelectric linear drives for moving the upper slider plate in the two translational directions or two rotary directions, wherein a central slider plate is arranged between the stator and the upper slider plate, and the at least two piezoelectric linear drives are each attached to the stator to move the upper slider plate in the two translational directions or two rotary directions, and wherein at least one piezoelectric linear drive attached to the stator is in contact with the upper slider plate through an opening in the central slider plate to move the upper slider plate in a first translational direction or a first rotary direction.

Abstract: Drive device (1) for driving a spindle (90) with a spindle axis A90, which is accommodated in a spindle space (39) extending along a longitudinal axis of the spindle space, the drive device (2) comprising a first actuator device (10, 210) and a second actuator device (20, 220) which can be reversibly varied when actuated along a first actuator axis L1 or a second actuator axis L2, an actuating device (40, 140, 240), a frame device (30, 130, 230), the arrangement comprising the frame device (30, 130, 230) and the actuating device (40, 140, 240) comprising at least two contact surface sections (51, 52, 151, 152, 254, 264) provided for contact with two different contact areas (91, 92) of the spindle (90) to rotate the spindle (90), wherein the frame device (30, 130, 230) is designed as a structurally continuous component which completely surrounds the spindle space (39), the first actuator device (10) and the second actuator device (20), drive motor and method for driving a spindle (90).

Abstract: A control device and a control method for a piezoelectric inertia motor are provided. In the stick phase, a first switching element and a second switching element are switched in directions opposite to one another by pulse width modulation, where a time component of a first switching state of ON and OFF increases relative to a time component of a second switching state of ON and OFF, the pulse width modulation is filtered by the capacitive piezoelectric actuator and an inductance, and a first charging operation is carried out, and the time components of the first switching state and the second switching state are reversed at the beginning of a slip phase, and thereby carrying out a second charging operation in the opposite direction to the first charging operation at the capacitive piezoelectric actuator. By storing electromagnetic energy in the inductance, the configuration provided allows for the reduction of energy dissipation as heat and can contribute to an energy-efficient drive for inertia motors.

Abstract: A method for operating an electromechanical element, comprising the following steps: by controlling a first control section which is deformable by an electrical voltage by a first voltage signal generation of adjusting movements of a friction element which is arranged on the electromechanical element and which is provided for frictional contact with an element to be driven, controlling of a second control section which is deformable by an electrical voltage by a second voltage signal, which comprises a signal section, the frequency of which compared to the first voltage signal is by a factor, an actuator, a drive device with an actuator and a motor with a drive device and an element to be driven.

Abstract: The invention relates to an annular or hollow cylindrical ultrasonic actuator, on the end faces of which are arranged n?2 friction elements, and on the outer peripheral surface of which are arranged 2n excitation electrodes, spaced apart from one another in each case by a separating gap, each of the friction elements being arranged in the region of a separating gap, wherein, between friction elements that are adjacent with respect to the periphery of the ultrasonic actuator and are located on different end faces, two excitation electrodes are arranged such that, when the ultrasonic actuator is electrically excited, the friction elements of both end faces simultaneously perform a movement which is suitable for driving an element to be driven to rotate in the same direction. The invention further relates to an ultrasonic motor having an ultrasonic actuator of this kind and having a holding device in which the ultrasonic actuator is inserted.

Abstract: The present disclosure relates to a linear drive, including: an actuator unit with at least one actuator; two guide elements and a movement element, wherein the movement element is displaceable along both guide elements by a movement generated by the actuator unit as a result of a stick-slip effect. In order to allow a more accurate displacement of the movement element in a compact design of the linear drive, the movement element can be brought into engagement with each of the two guide elements by static friction in order to be displaced along the two guide elements as a result of the stick-slip effect.

Abstract: Disclosed is electromechanical actuator for ultrasonic motor in the shape of an n-sided regular polygon plate with n being equal to or greater than five. The polygon plate has two larger main surfaces and at least five smaller side surfaces connecting the main surfaces with each other. Two electrodes are arranged on one of the main surfaces and are electrically isolated from each other by a linear isolation area. One electrode is arranged on the other of the main surfaces. The polygon plate comprises an electromechanical material that undergoes a deformation when electric voltage is applied to the electrodes. The material of the electromechanical actuator comprises a single or polycrystalline piezoelectric ceramic with piezoelectric charge constant d31 differing from piezoelectric charge constant d32 both in sign and in value. The piezoelectric charge constants d31 and d32 define a first and second main deformation direction of the actuator perpendicular to each other.

Abstract: A method for operating an electromechanical element, comprising the following steps: by controlling a first control section (A1) which is deformable by an electrical voltage by a first voltage signal (S10) generation of adjusting movements of a friction element which is arranged on the electromechanical element and which is provided for frictional contact with an element (90) to be driven, controlling of a second control section (A2) which is deformable by an electrical voltage by a second voltage signal (S20), which comprises a signal section (S21), the frequency of which compared to the first voltage signal (S10) is by a factor, an actor, a drive device with an actor and a motor with a drive device and an element to be driven.

Abstract: An actuator in the form of a stack is described, wherein the stack includes multiple first pairs of layers of a polarized electromechanical material and multiple second pairs of layers of a polarized electromechanical material, and the first and second pairs of layers are disposed, one behind the other, wherein at each pair of layers on each of its terminal surfaces electrically conductive layers are disposed, and, between the layers of each pair of layers, an electrically conductive layer for connection to at least one connection electrode of a second polarity is disposed, and the polarization directions of the electromechanical material of the layers of each pair are aligned opposite to one another, and the directions of polarization of the material of the layers of each pair of layers are aligned perpendicular to the directions of polarization of the material of the layers of each adjacent pair of layers.

Abstract: A method is disclosed for closed-loop motion control of an ultrasonic motor having at least one actuator with an excitation electrode and at least one common electrode, an element to be driven, a controller and at least one electrical generator for generating at least first and second excitation voltages U1 and U2 to be applied to the electrodes of the actuator for vibration of the actuator. A friction element of the actuator, due to its vibration, intermittently contacts the element to be driven with a driving force. The method includes providing the at least two excitation voltages U1 and U2 with different resemblance frequencies, a frequency difference deviating from a servo sampling frequency of the controller by 5 kHz at the most, and simultaneously applying the excitation voltages to the electrodes of the actuator.

Abstract: An actuator with a rectangular shape] is made of polarized electromechanical material having two large main surfaces and at least four side surfaces, two of which being longer than the other two side surfaces. At least one friction element is arranged on at least one of the shorter side surfaces. At least two active electrodes are arranged on one of the main surfaces, with one common electrode arranged on the other of the main surfaces The electromechanical material of the actuator is excitable to perform standing wave deformations due to an electric field generated therein for moving the friction element to drive an element. The actuator aspect ratio for its length to its thickness is between 3.9 and 4.1 and an aspect ratio for the length relative to width is between 2 and 5.

Abstract: A rotary ultrasonic motor includes an ultrasonic actuator, a driven element, an inner casing member and an outer casing member. A piezoelectric or electrostrictive or magnetostrictive material is arranged between an excitation electrode and at least one general electrode. The ultrasonic actuator is between the inner and outer casing members of a casing, and is directly or indirectly in contact with the element to be driven, so that periodic deformations generated in the ultrasonic actuator by electrical excitation are transferable to the drive element. The ultrasonic actuator is mounted by a retaining device arranged on the casing with at least one retaining section which engages in a recess associated with a respective retaining section.

Abstract: The present invention relates to a linear drive, comprising: an actuator unit with at least one actuator; two guide elements and a movement element, wherein the movement element is displaceable along both guide elements by a movement generated by the actuator unit as a result of a stick-slip effect. In order to allow a more accurate displacement of the movement element in a compact design of the linear drive, according to the invention, the movement element can be brought into engagement with each of the two guide elements by means of static friction in order to be displaced along the two guide elements as a result of the stick-slip effect.

Abstract: The invention relates to an annular or hollow cylindrical ultrasonic actuator, on the end faces of which are arranged n?2 friction elements, and on the outer peripheral surface of which are arranged 2 n excitation electrodes, spaced apart from one another in each case by a separating gap, each of the friction elements being arranged in the region of a separating gap, wherein, between friction elements that are adjacent with respect to the periphery of the ultrasonic actuator and are located on different end faces, two excitation electrodes are arranged such that, when the ultrasonic actuator is electrically excited, the friction elements of both end faces simultaneously perform a movement which is suitable for driving an element to be driven to rotate in the same direction. The invention further relates to an ultrasonic motor having an ultrasonic actuator of this kind and having a holding device in which the ultrasonic actuator is inserted.

Abstract: Electromechanical actuator (1) for an ultrasonic motor, the actuator (1) having the shape of a plate (2) comprising two main surfaces (3) and side surfaces (4) connecting the main surfaces (3) with each other, and with two equally shaped electrodes (6, 7) in symmetrically arranged to each other on a first of the main surfaces thereby defining a symmetry axis S and with at least one electrode (8) arranged on a second of the main surfaces wherein the plate (2) comprises an electromechanical material comprising a single or polycrystalline piezoelectric ceramic with its piezoelectric charge constant d31 differing from its piezoelectric charge constant d32 both in sign and in value, with the piezoelectric charge constant d31 defining a first main deformation direction of the actuator and with the piezoelectric charge constant d32 defining a second main deformation direction of the actuator, wherein the orientation of the symmetry axis S is parallel to the first main deformation direction or to the second main defo

Abstract: A rotary ultrasonic motor includes an ultrasonic actuator, a driven element, an inner casing member and an outer casing member. A piezoelectric or electrostrictive or magnetostrictive material is arranged between an excitation electrode and at least one general electrode. The ultrasonic actuator is between the inner and outer casing members of a casing, and is directly or indirectly in contact with the element to be driven, so that periodic deformations generated in the ultrasonic actuator by electrical excitation are transferable to the drive element. The ultrasonic actuator is mounted by a retaining device arranged on the casing with at least one retaining section which engages in a recess associated with a respective retaining section.

Abstract: A method is disclosed for closed-loop motion control of an ultrasonic motor having at least one actuator with an excitation electrode and at least one common electrode, an element to be driven, a controller and at least one electrical generator for generating at least first and second excitation voltages U1 and U2 to be applied to the electrodes of the actuator for vibration of the actuator. A friction element of the actuator, due to its vibration, intermittently contacts the element to be driven with a driving force. The method includes providing the at least two excitation voltages U1 and U2 with different resemblance frequencies, a frequency difference deviating from a servo sampling frequency of the controller by 5 kHz at the most, and simultaneously applying the excitation voltages to the electrodes of the actuator.

Abstract: An actuator with a rectangular shape] is made of polarized electromechanical material having two large main surfaces and at least four side surfaces, two of which being longer than the other two side surfaces. At least one friction element is arranged on at least one of the shorter side surfaces. At least two active electrodes are arranged on one of the main surfaces, with one common electrode arranged on the other of the main surfaces The electromechanical material of the actuator is excitable to perform standing wave deformations due to an electric field generated therein for moving the friction element to drive an element. The actuator aspect ratio for its length to its thickness is between 3.9 and 4.1 and an aspect ratio for the length relative to width is between 2 and 5.

Abstract: A piezoelectric motor includes at least two piezoelectric actuators. Each actuator includes two piezoelectric elements on opposite sides of a coupling element, the sides being main sides of the piezoelectric actuators and having a larger area than other surfaces or sides of the piezoelectric actuators. The main surfaces of each of the piezoelectric actuators connect with at least four side surfaces of the piezoelectric actuator. The motor includes an elastic element coupled to and spacing the first and second piezoelectric actuators from each other and there is also a frictional element that couples the first and second piezoelectric actuators for frictional contact for driving an object. The first and the second piezoelectric actuators are adapted to deform in a direction that is substantially perpendicular to a plane defined by the side surface to which the elastic element is attached using a longitudinal piezoelectric effect of the piezoelectric elements.

Abstract: A piezoelectric motor includes at least two piezoelectric actuators. Each actuator includes two piezoelectric elements on opposite sides of a coupling element, the sides being main sides of the piezoelectric actuators and having a larger area than other surfaces or sides of the piezoelectric actuators. The main surfaces of each of the piezoelectric actuators connect with at least four side surfaces of the piezoelectric actuator. The motor includes an elastic element coupled to and spacing the first and second piezoelectric actuators from each other and there is also a frictional element that couples the first and second piezoelectric actuators for frictional contact for driving an object. The first and the second piezoelectric actuators are adapted to deform in a direction that is substantially perpendicular to a plane defined by the side surface to which the elastic element is attached using a longitudinal piezoelectric effect of the piezoelectric elements.