Abstract: The present disclosure relates to a positioning device for positioning an object in a positioning plane. To minimize the position error (contouring error) in a continuous orbital travel in contrast to two linear adjusters (X and Y) arranged at a right angle to each other, the positioning device includes two rotation drives having different diameters and an object receiver for receiving the object. The object receiver is coupled to a first of the two rotation drives, which in turn is coupled to the second of the two rotating drives so that the object receiver is rotatable about the axes of rotation (A2, A3) of both rotation drives that are offset in parallel, and is thereby adjustable in the positioning plane. A light processor having such a positioning device, and a method for laser eye surgery using such a light processor are also disclosed.

Abstract: The present invention relates to a magnetic guiding device having a stator and a slide movable along a guiding direction relative to the stator, the stator and the slide being magnetized or magnetizable such that a magnetic field extending through the stator and the slide generates a magnetic supporting force on the slide acting along the guiding direction. To improve the running properties of the slide by avoiding differential slip, jerking and varying friction, according to the invention, the magnetic field extending through the stator and the slide simultaneously generates a magnetic pretensioning force which urges the slide and the stator against each other.

Abstract: The disclosure relates to a joint, which has at least three degrees of rotational freedom, having a rigid carrier element and at least two elastically deformable joint elements formed on the carrier element in an overlapping arrangement, at least in sections. Each joint element can include two rod-shaped web portions arranged on the carrier element and extending therefrom which are arranged either converging or diverging relative to each other, and at their end facing away from the carrier element are connected to each other by way of a contact portion. Two web portions connected to each other extend in a first common plane and two other web portions connected to each other extend in a second common plane, and the first common plane and the second common plane intersect.

Abstract: Spindle nut which can be brought into engagement with or engages with a corresponding spindle, wherein the spindle nut comprises an internal thread which is defined by three longitudinal grooves, which run in a direction parallel to a central thread axis A of the spindle nut, which is interrupted, as a result of which three spaced-apart internal thread segments are formed in the spindle nut, and, in case the spindle nut is in engagement with the spindle, the external thread of the spindle is in contact only with the internal thread segments, wherein the spindle nut, with respect to a cross section arranged perpendicular to its central thread axis A, comprises a cross section geometry with an inner cross-section curve K facing the central thread axis, wherein at least the inner thread segments each form a partial circle shaped section of the cross section curve K, wherein the diameter of each partial circle shaped section corresponds to the core diameter of the internal thread, and the partial circle shaped se

Abstract: The present disclosure relates to a piezoelectric stick-slip-motor and control method. An exemplary method to enable speed variation of the piezoelectric stick-slip-motor with a reduced noise generation, includes: applying a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which the drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the motor with a constant speed; and changing the motor speed by gradually increasing or decreasing the gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping the frequency of the drive voltage signal constant.

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: A sensor probe assembly includes a probe, and a sensor assembly coupled to the probe. The sensor assembly measures a physical or electrical characteristic of a surface that the probe is near to or in contact with. The sensor assembly is symmetrically disposed around a center axis of the probe.

Abstract: An inertia drive motor is disclosed which includes an element to be driven, and a stator, the stator having: an elastic frame, at least one friction element arranged on the elastic frame and configured to be brought into frictional contact with the element to be driven, and a first electromechanical actuator and a second electromechanical actuator, which are configured to cause, by interaction, a deformation of the elastic frame, upon excitation with different excitation voltages having a sawtooth signal, so as to displace the at least one friction element for driving the element to be driven by stick-slip contact with the friction element.

Abstract: The disclosure relates to an ultrasonic actuator formed of a plate having a base, a cover surface which is geometrically similar to the base, and a lateral surface which interconnects the base and the cover surface, wherein the plate includes an electromagnetic material. Electrodes for inciting periodic deformations of the plate are arranged on the base of the plate and on the cover surface of the plate opposite the base. The base includes at least two faces which are arranged in parallel with one another and form contact portions of the lateral surface, and the two faces of the base arranged in parallel with one another, together with connecting lines which interconnect the respective end points of the faces arranged in parallel, form a parallelogram inscribed in the base, in which parallelogram an angle different from 90° is enclosed between adjacent faces. A motor having such an ultrasonic actuator is also disclosed.

Abstract: A motion control system and method for controlling a stick-slip piezo motor includes an electronic controller and an analog driver for moving a mechanical device. When operating in a digital circuit mode, an electronic controller controls a digital-to-analog converter for moving the stick-slip piezo motor at a low speed. When operating in a faster analog circuit mode, the electronic controller, via an analog driver, operates to control an analog hardware circuit to move the stick-slip piezo motor at a high speed. The electronic controller operates in the digital circuit mode at start-up of the piezo motor.

Abstract: A positioning device is disclosed which can include a base and a positioning element, which is configured to be adjusted with respect to six degrees of freedom relative to the base, wherein the positioning element is coupled to the base via at least three pairs of length-variable and electrically driven leg elements, and each leg element is connected, at its respective ends, to the base and the positioning element via an articulation element. A respective pair of legs projects through another pair of legs and each pair of legs is arranged perpendicular to the respective other pairs of legs.

Abstract: The present disclosure relates to an electromechanical linear drive having a housing, an electromechanical drive unit, a transmission element which is coupled to the electro-mechanical drive unit, and an element to be driven which is in frictional contact with the transmission element, where the transmission element is mounted on at least two bearing points with respect to the housing. Improved accessibility to the element to be driven and a longer adjustment path of the element to be driven can be achieved by placing the element to be driven in frictional contact with the transmission element at a point of engagement outside of all bearing points.

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: The invention relates to an adjustment device (1), comprising at least two linear stages (2, 3), which are arranged next to each other and which are fixedly connected to each other (6) by means of one of the adjustment sections (5) of each of the linear stages such that an adjustment movement of one linear stage can be transferred to the adjacent linear stage, wherein one linear stage is designed to bring about an increase in the distance between the adjustment sections arranged on said linear stage as a result of actuation of the adjustment element and an adjacent linear stage is designed to bring about a decrease in the distance between the adjustment sections arranged on said linear stage as a result of actuation of the adjustment element so that a displacement of the adjustment device can be realized, which displacement corresponds to the sum of the amounts of the changes in the distance between the adjustment sections of the linear stages.

Abstract: Method for operating an ultrasonic motor with an ultrasonic actuator formed as a plate and an electrical excitation device. The ultrasonic actuator has at least four identical volume regions arranged symmetrically in relation to a transverse plane and in relation to a longitudinal plane, each volume region forming acoustic standing waves and static bending deformations. The electrical excitation device provides at least one electric alternating voltage and two static electric voltages the at least one alternating voltage U1 being applied in a dynamic operating mode simultaneously to two of the generators for forming an acoustic standing wave in the ultrasonic actuator, and the two static electric voltages being applied in a static operating mode simultaneously to all generators for forming a static bending deformation of the ultrasonic actuator.

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: The invention relates to a fiber holder system (1) comprising a base (2) provided for arrangement on a positioning device, the base (2) comprising at least three contact surfaces (3) arranged perpendicular to one another, and a fiber holder (4) with a arrangement section (5), an arm section (6) and a holding section (7), and a holding device (8) for arrangement of the fiber holder (4) on the base (2) with a defined force in a positionally stable and releasable manner, wherein the arrangement section (5) also comprises three mutually perpendicular arrangement surfaces (9), and wherein the holding device (8) comprises magnets or magnetic sections in order to use the corresponding magnetic forces to press the arrangement surfaces (9) against the contact surfaces (3) with a defined force and thereby to realize the positionally stable and releasable arrangement of the fiber holder (4) on the base (2), and wherein a distal end (10) of the arm portion (6) is connected to the abutment portion (5) and wherein at the o

Abstract: The invention relates to an electric motor having at least one magnetic track, which has a plurality of magnet elements connected in a line in a longitudinal direction or in the shape of a ring, in particular in a Halbach array configuration, and having at least one coil assembly, which includes a support that is substantially electrically and magnetically non-conductive with respect to the magnetic track, which is configured such that the coil assembly and the magnetic track are capable of carrying out a guided movement relative to each other, and which includes at least one group of three conductive flat coils.

Abstract: The present disclosure relates to a piezoelectric stick-slip-motor and control method. An exemplary method to enable speed variation of the piezoelectric stick-slip-motor with a reduced noise generation, includes: applying a cyclic sawtooth-waveform drive voltage signal with a constant frequency in which the drive voltage (V) increases to and decreases from a peak voltage (Vp) for operating the motor with a constant speed; and changing the motor speed by gradually increasing or decreasing the gradient (dV/dt) of increasing the drive voltage (V) to the peak voltage (Vp) with each subsequent sawtooth-waveform drive voltage signal cycle (C) while keeping the frequency of the drive voltage signal constant.