Abstract: An ultrasonic motor, is disclosed having an ultrasonic actuator in the form of a rectangular piezo-electric plate, which has two generators for acoustic standing waves and on which at least two friction elements are arranged, an element to be driven, and an electric excitation device. The piezoelectric plate of the actuator is divided into two pairs of diagonally oppositely disposed sections by two virtual planes which extend perpendicularly to each other and which extend through the center line of the main surfaces of the actuator, wherein each of the generators includes two parts which can be operated in an antiphase manner and each of which is arranged in a diagonal section of the piezoelectric plate, and the friction elements are arranged on one or two end faces of the piezoelectric plate.

Abstract: The invention relates to an ultrasonic motor comprising a plate-shaped piezoelectric ultrasonic actuator (2) and a of friction element (5) arranged on a side surface thereof, wherein the connection line (V) through the friction point and the focal point (S) of the ultrasonic actuator defines an operating direction, and a perpendicular plane intersecting the ultrasonic actuator defines an operating plane (W). A holder (6) has two force inlet sections (7) in order to move the holder and thereby the ultrasonic actuator in a direction parallel to the operating direction, and to press same against an element to be driven. The force inlet sections, preferably based on permanent magnets (8, 9) are each arranged in the operating plane and laterally next to and at a distance from the the ultrasonic actuator, and the intersection point (SP) of the connection line (V) with the operating plane (W) either coincides with the focal point (S) or lies between the focal point and the side surface having the friction element.

Abstract: An ultrasonic motor includes an actuator with a piezo-electric plate, at least one friction element, an element to be driven in active contact with the friction element, a tensioning device for pressing the friction element against the element to be driven, and a thermo-compensation platform having abutting sections by which displacement of the actuator is only possible along abutting side surfaces of the piezo-electric plate. The tensioning device includes two rotation angle levers of which two tension lever arms are connected to one another via a tensioned tension spring, to exert torque on the rotation angle lever such that pressure lever arms will act on the actuator to be linearly guided by the abutting sections in the direction of the element to be driven.

Abstract: The invention relates to a method for joining a ceramic friction element (11) to a piezoelectric element (1), comprising, among other things, the following steps: pressing (14) a joining surface (10) of the friction element and a contact surface (9) of the piezoelectric element against each other with a low-melting glass mass (12) arranged therebetween and maintaining the pressing force for all subsequent steps; heating (17) the piezoelectric element and the friction element to a defined temperature above the Curie point of the piezoceramic material of the piezoelectric element and above the melting point of the low-melting glass mass; thereafter, while maintaining the temperature, applying an electric polarization voltage Up to electrodes of the piezoelectric element; removing the polarization voltage after the Curie point has been fallen below; and cooling the piezoelectric element and the friction element to room temperature without an electric voltage being applied to the electrodes.

Abstract: Disclosed is a piezoelectric rotary drive for a shaft, which includes a piezoelectric actuator, a deformable frame that can be coupled with a coupling section to the shaft in a force-fit manner in order to accomplish a stick-slip drive, and a loading device which can apply a preloading force to the coupling section and/or the actuator and/or the shaft. To facilitate production and assembly, the loading device can be a leaf spring which in the relaxed state extends substantially in a plane, such as along a straight line.

Abstract: The invention relates to a sensor device and method for detecting measurement data relating to the absolute position of a linearly or rotationally moveable body, comprising an optical sensor system, wherein the optical sensor system uses exclusively zero-order rejections for the position measuring, and a magnetic sensor system which emits a second sensor output signal depending on the position to be determined of the moveable body, wherein the gauge of the optical sensor system and the gauge of the magnetic sensor system are integrated in a common gauge body, and a computer unit which is provided to obtain the first sensor output signal and the second sensor output signal and to generate a common sensor output signal from the first sensor output signal and the second sensor output signal, wherein the current period of the second sensor system can be deduced from the first sensor output signal at every time, in order to calculate clear absolute position information based on the first and second sensor output s

Abstract: The invention relates to a planar positioning apparatus, comprising a stator which comprises a coil arrangement consisting of flat coils, a rotor which is arranged opposite the stator in the operating state of the positioning apparatus and which has a planar magnet arrangement comprising a plurality of rows of magnets, wherein the plane which is spanned by the planar magnet arrangement is arranged parallel to the plane of the coil arrangement, at least one position measuring head, which is arranged within the stator or rotor in the operating state of the positioning apparatus, for detecting the position of the rotor relative to the stator, an area scale which is fixed to the rotor or to the stator in a specific position, and an evaluation and control device for evaluating position signals of the position measuring head and for controlling the application of current to the coil arrangement for controlling the position of the rotor with respect to the stator.

Abstract: The invention relates to an actuator system comprising at least four electrically controllable, longitudinally adjustable actuators, to each of which a compressive force is applied in the direction of the longitudinal adjustment thereof by means of a separate housing that has an integrally formed resilient portion, each housing being designed as a single piece along with a base element shared by all housings. The invention further relates to an array comprising a plurality of actuator systems of said type.

Abstract: The invention relates to a planar positioning apparatus, comprising a stator, which comprises a coil arrangement comprising flat coils, a rotor which is arranged opposite the stator in the operating position of the positioning apparatus and has a planar magnet arrangement comprising a plurality of rows of magnets, wherein the plane which is spanned by the planar magnet arrangement is arranged parallel to the plane of the coil arrangement, a position detecting device for detecting the position of the rotor relative to the stator, and an evaluation and control device for evaluating position signals of the position detecting device and for controlling a current supply to the coil arrangement for controlling the position of the rotor with respect to the stator, wherein the coil arrangement comprises in each case n×3 (n?1) elongate flat coils which are interleaved with one another, in a first and second orientation of the coil arrangement which, over the majority of their extent, are designed as conductor runs of

Abstract: A hollow-cylindrical ultrasonic actuator is disclosed a central axis, an inner peripheral surface facing the central axis and an outer peripheral surface facing away from the central axis and spaced apart from the inner peripheral surface, a closed inner contour curve, a closed outer contour curve, at least one electrode, and an electromechanical material provided between opposed electrodes. In a non-actuated state of the ultrasonic actuator, a curvature of the inner contour curve or of an outer contour curve includes at least three mutually spaced-apart local maximum points.

Abstract: An exemplary ultrasonic motor includes an ultrasonic actuator, functioning as a waveguide resonator, formed as a rectangular piezo-electrical plate having two main surfaces and side surfaces that join the main surfaces together, an element to be driven and an electrical excitation device. At least one friction element is arranged on at least one side surface of the ultrasonic actuator and is in frictional contact with the element to be driven. The piezo-electrical plate is divided into three parts. The central part forms a generator for an acoustic longitudinal standing wave, and the peripheral parts bordering the central part form generators for an acoustic bending standing wave. Each generator is electrically connected to the electrical excitation device-can be electrically controlled, and can be divided into two equally-sized and electrically individually controllable sub-generators.

Abstract: An ultrasonic motor includes an actuator with a piezo-electric plate, at least one friction element, an element to be driven in active contact with the friction element, a tensioning device for pressing the friction element against the element to be driven, and a thermo-compensation platform having abutting sections by which displacement of the actuator is only possible along abutting side surfaces of the piezo-electric plate. The tensioning device includes two rotation angle levers of which two tension lever arms are connected to one another via a tensioned tension spring, to exert torque on the rotation angle lever such that pressure lever arms will act on the actuator to be linearly guided by the abutting sections in the direction of the element to be driven.

Abstract: An ultrasonic motor and method are disclosed with an element to be driven and a plate-shaped ultrasonic actuator made of polarized electromechanical material with at least two friction elements arranged on one of its side. The ultrasonic actuator can include at least two generators for acoustic standing waves and each of the generators can include two cooperating and spaced sub-generators, and one respective sub-generator of a generator is located between the sub-generators of an adjacent generator, and the sub-generators of one generator are arranged in mirror image to the sub-generators of an adjacent generator. A polarization direction of the electromechanical material of one of the two sub-generators of one generator differs from the polarization direction of the electromechanical material of the other sub-generator of the same generator.

Abstract: An ultrasonic actuator made of polarized piezoelectric material in the form of a single-layer or multilayer flat rectangular plate with two main faces, at least four lateral faces joining the main faces, and a thickness T, which is defined by the distance between the main faces in the direction of their surface normals, and wherein on both the one main face and the other opposite main face at least one layer including two triangular electrodes imposingly arranged and separated by a diagonal separating region, the electrodes on the one main face being offset relative to the electrodes on the other main face by 90°. The ultrasonic actuator is characterized in that on at least one of the lateral faces there are two mutually spaced friction elements designed to contact at least one element that is to be driven by the ultrasonic actuator.

Abstract: A method and device are disclosed for actuating a piezoelectric motor by two driving electrodes by applying periodic control voltages to the driving electrodes. A simplified closed-loop control of the piezoelectric motor is realized by reducing the static friction of a friction contact between a friction element of the piezo-electric motor and an output element to be driven by the friction element without a propulsion of the output element at the same time. In exemplary embodiments, the periodic control voltages are applied with a phase shift to the driving electrodes in a first step of the method, and in a second step of the method, the amplitude ratio of the periodic control voltages is changed with respect to the first step.

Abstract: A method for controlling an ultrasonic motor. From a starting velocity or starting position of the driven element, the method includes adjusting the frequency of the electrical excitation voltage such that it is equal to or close to the mechanical resonance frequency of the ultrasonic actuator; changing the frequency of the electrical excitation voltage using the signal of the velocity sensor or the position sensor towards the anti-resonance frequency of the ultrasonic actuator until an end velocity or an end position of the driven element is reached; and controlling the end velocity or position of the driven element with a predetermined accuracy by means of antiphase frequency change. Also disclosed is a corresponding control arrangement for an ultrasonic motor having an ultrasonic actuator with at least two acoustic wave generators, a driven element and a generator via a frequency adjustment.

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: An ultrasonic motor, is disclosed having an ultrasonic actuator in the form of a rectangular piezo-electric plate, which has two generators for acoustic standing waves and on which at least two friction elements are arranged, an element to be driven, and an electric excitation device. The piezoelectric plate of the actuator is divided into two pairs of diagonally oppositely disposed sections by two virtual planes which extend perpendicularly to each other and which extend through the center line of the main surfaces of the actuator, wherein each of the generators includes two parts which can be operated in an antiphase manner and each of which is arranged in a diagonal section of the piezoelectric plate, and the friction elements are arranged on one or two end faces of the piezoelectric plate.

Abstract: An inertial drive is disclosed, comprising a length-changeable actuator element (I), a frame element (4) with a support section and with a deformation section, against the contact surfaces of which the actuator element bears, wherein the deformation section has an articulation section (13), a flat spring element (5) which is arranged on the deformation section and has a friction section (3) at the free end thereof, and a friction body (2), which can be driven, in mechanical contact with the friction section. A change in length (S) of the actuating element causes a rotatory movement (D) of the deformation section about the articulation section, which movement is transmitted via the spring element to the friction section for driving the friction body which can be driven.

Abstract: The invention relates to an ultrasonic motor, comprising a piezoelectric ultrasonic actuator (1) having four friction elements (4) disposed thereon, a friction surface (6) which is in frictional contact with the friction elements, and an electrical excitation device (16), wherein the ultrasonic actuator is in the shape of a ring or hollow cylinder, having an inner circumferential surface (14), an outer circumferential surface (12) and two planar end surfaces (5) connecting the inner and the outer circumferential surfaces.