Abstract: A device to determine a state of an ultrasound welding process, which can be carried out using an ultrasound tool, includes a sensor element and an evaluation unit. The sensor element is configured to detect an electrical control signal from an ultrasound tool. The evaluation unit is configured to determine a signal property of the control signal and to determine the status of the ultrasound welding process based on a reference signal profile and on the determined signal property. An assembly with an ultrasound welding system and a method are also included.

Abstract: The present invention relates to a method for determining at least one physical characteristic value of an electromechanical oscillatory system, which comprises a piezoelectric element and at least one additional element coupled, with respect to oscillation, to the piezoelectric element, the piezoelectric element having an electrode and a counter electrode.

Abstract: The present invention concerns an ultrasonic vibration unit having a converter (1) for converting an electric ac voltage into a mechanical ultrasonic vibration and a sonotrode which is vibrationally coupled to the converter (1), wherein the sonotrode and the converter (1) are matched to each other in such a way that the ultrasonic vibration unit can vibrate with a natural frequency f, in which a standing longitudinal wave having at least one vibration node and at least two vibration antinodes is formed within the ultrasonic vibration unit.

Abstract: A device to determine a state of an ultrasound welding process, which can be carried out using an ultrasound tool, includes a sensor element and an evaluation unit. The sensor element is configured to detect an electrical control signal from an ultrasound tool. The evaluation unit is configured to determine a signal property of the control signal and to determine the status of the ultrasound welding process based on a reference signal profile and on the determined signal property. An assembly with an ultrasound welding system and a method are also included.

Abstract: The present invention concerns an ultrasonic vibration device having a sonotrode and a converter, wherein the converter has a piezoelectric actuator for converting an electrical alternating voltage into a mechanical vibration, wherein there is provided a first piezoelectric sensor element which outputs a first measurement signal which varies in dependence on the vibration amplitude of the mechanical vibration. To provide an ultrasonic vibration device which allows measurement of at least one intensive state variable like for example the temperature or the ageing state of the piezoelectric actuator it is proposed according to the invention that there is provided a second piezoelectric sensor element which outputs a second measurement signal which varies in dependence on the vibration amplitude of the mechanical vibration, wherein the second piezoelectric sensor element differs in a physical property from the first piezoelectric sensor element.

Abstract: The present invention concerns an ultrasonic vibration unit having a converter (1) for converting an electric ac voltage into a mechanical ultrasonic vibration and a sonotrode which is vibrationally coupled to the converter (1), wherein the sonotrode and the converter (1) are matched to each other in such a way that the ultrasonic vibration unit can vibrate with a natural frequency f, in which a standing longitudinal wave having at least one vibration node and at least two vibration antinodes is formed within the ultrasonic vibration unit.

Abstract: An oscillating conveyor comprising an oscillating rail, at least one electromagnet with a coil, and an armature connected to the oscillating rail, which armature can be moved by activation of the coil to generate an oscillation of the oscillating rail, wherein the coil is part of an oscillator circuit, wherein the oscillator frequency of the oscillator signal of the oscillator circuit depends on the inductance of the coil, which is influenced by the position of the armature relative to the coil, wherein the oscillating conveyor comprises a feedback circuit, which drives the coil by means of a control signal which maps the change over time in the frequency of the oscillator.

Abstract: A sensor device which is used to provide a control device with at least one operating parameter of an oscillating conveyor, the control device being used to control a drive device for exciting oscillation of an oscillating rail on the basis of the operating parameter, the sensor device including at least one sensor element for recording the operating parameter or at least one measured value from which the operating parameter can be determined, the sensor device including at least one communication device for wirelessly transmitting the operating parameter to the control device and an energy supply device for supplying the sensor device with operating energy, the energy supply device being used to convert a vibration generated by the drive device and/or electromagnetic radiation into the operating energy.

Abstract: An oscillating conveyor including an oscillating rail, on which goods can be conveyed in the direction of a first position on the oscillating rail by oscillation of the oscillating rail, and also including at least one excitation element for exciting the oscillation. The excitation element is an ultrasonic transducer which is coupled to the oscillating rail at the first position and via which the oscillating rail can be excited into oscillating at the first position in dependence on a control signal supplied by a control device. The oscillating conveyor has at least one damping element and/or the oscillating rail itself is formed from an oscillation-damping material so that the oscillation amplitude decreases along the oscillating rail as the distance from the first position increases.

Abstract: A sensor device which is used to provide a control device with at least one operating parameter of an oscillating conveyor, the control device being used to control a drive device for exciting oscillation of an oscillating rail on the basis of the operating parameter, the sensor device including at least one sensor element for recording the operating parameter or at least one measured value from which the operating parameter can be determined, the sensor device including at least one communication device for wirelessly transmitting the operating parameter to the control device and an energy supply device for supplying the sensor device with operating energy, the energy supply device being used to convert a vibration generated by the drive device and/or electromagnetic radiation into the operating energy.

Abstract: An oscillating conveyor comprising an oscillating rail, at least one electromagnet with a coil, and an armature connected to the oscillating rail, which armature can be moved by activation of the coil to generate an oscillation of the oscillating rail, wherein the coil is part of an oscillator circuit, wherein the oscillator frequency of the oscillator signal of the oscillator circuit depends on the inductance of the coil, which is influenced by the position of the armature relative to the coil, wherein the oscillating conveyor comprises a feedback circuit, which drives the coil by means of a control signal which maps the change over time in the frequency of the oscillator.

Abstract: An oscillating conveyor for the two-dimensional movement of objects, comprising an oscillating plate, on the conveying surface of which at least one object is movable by the oscillations of the oscillating plate, and at least two excitation elements for exciting oscillations in the oscillating plate, wherein the excitation elements are ultrasound transducers coupled to the oscillating plate at excitation positions spaced a certain distance apart, by means of which transducers the oscillating plate can be excited to oscillate at the excitation position in question as a function of a control signal, which can be sent individually by a control unit to each excitation element.

Abstract: An oscillating conveyor including an oscillating rail, on which goods can be conveyed in the direction of a first position on the oscillating rail by oscillation of the oscillating rail, and also including at least one excitation element for exciting the oscillation. The excitation element is an ultrasonic transducer which is coupled to the oscillating rail at the first position and via which the oscillating rail can be excited into oscillating at the first position in dependence on a control signal supplied by a control device. The oscillating conveyor has at least one damping element and/or the oscillating rail itself is formed from an oscillation-damping material so that the oscillation amplitude decreases along the oscillating rail as the distance from the first position increases.

Abstract: Disclosed are a piezoelectric drive unit (10) and a method for operating such a drive unit in order to adjust movable parts (11), especially in a motor vehicle. Said piezoelectric drive unit (10) comprises at least one piezo motor (12) that is fitted with at least one piezo actuator (18). At least one frictional element (30) of the piezo motor (12) makes it possible to generate a relative movement in relation to a frictional surface (14) located across from the frictional element (30). Said at least one frictional element (30) is disposed on a bridging web (28) of the motor (12). The bridging web (28) places the frictional element (30) at a distance (2) from the central axis (89) of the at least one piezo actuator (18), said central axis (89) extending in a longitudinal direction (19).