摘要:
The invention relates to an actuating device, comprising a control element, which is movably arranged in a first direction and a second direction, wherein the first and the second direction are opposing one another. The actuating device further comprises a first piezo actuator and a second piezo actuator, wherein the first piezo actuator puts the actuating device into the first direction, and wherein the second piezo actuator puts the actuating device into the second direction.
摘要:
Betriebsverfahren eines Piezolinearantriebes (D) mit einer Gruppe von Piezostapelaktoren, welche einen Läufer (R) antreiben, bei dem die Aktoren eine auf einem gemeinsamen Substrat (S a ,S b ) befindliche Mehrschichtkeramikanordnung darstellen, wobei innerhalb eines Stapels der Mehrschichtanordnung ein erstes Stapelteil als Scher- bzw. Longitudinalaktor (D1,D2) und ein zweites Stapelteil als Klemmaktor (C1,C2) ausgebildet ist und Letzteres mindestens indirekt in Klemm- und Scherkontakt mit dem Läufer steht und mindestens zwei identische Aktoren sich nebeneinander befinden, um im Schrittbetrieb wechselseitige Klemm- und Vorschubbewegungen auszuführen, zum Betrieb im Schrittmodus zur Grobpositionierung, wobei die benachbarten Aktoren der Gruppe zu abwechselnden Klemm- und Vorschubbewegungen angesteuert werden, wobei Ansteuersignale aus einer geschwindigkeits-proportionalen Steuergröße abgeleitet werden.
摘要:
The invention relates to an ultrasonic motor, comprising a large number of plate-shaped piezoelectric ultrasonic actuators (10), each having at least one friction element (18) arranged thereon, wherein an element (1) to be driven is associated with in each case one ultrasonic actuator or in each case one pair of ultrasonic actuators, and the ultrasonic motor furthermore has a housing and an electrical exciter device. According to the invention, the elements to be driven are moveable independently of one another, and each ultrasonic actuator or each ultrasonic actuator pair is arranged in a holder (2), wherein the holders are pressed against one another by means of housing side covers (3), and the friction elements of the ultrasonic actuators are pressed against a friction layer (50) of the corresponding element to be driven by means of an elastic interlayer (5), which is in contact with those peripheral faces of the ultrasonic actuators which are arranged opposite the friction elements, with the result that, overall, a cassette-like ultrasonic motor stack is produced.
摘要:
Provided is a control method for a contraction-type gel actuator that can control an action of the contraction-type gel actuator with high accuracy and can be used for position control or the like. The method for controlling a displacement in the thickness direction of the contraction-type gel actuator (10) having an effect of contraction in the thickness direction by applying a voltage between an anode (14) and a cathode (12) between which a gel (13a or 13b) which comprises a dielectric polymeric material is interposed, which comprises a step of performing a feedback control of an applied voltage (E), with a sampled value of a displacement (x) when the applied voltage (E) is made to act on the contraction-type gel actuator (10), on the basis of the following equation (1):
in the equation: xd represents a target displacement of the contraction-type gel actuator; Ed represents an applied voltage with respect to the target displacement xd obtained by the linear approximation of the applied voltage and the displacement from a measured result of the displacement in accordance with the applied voltage of the contraction-type gel actuator; and kp represents a proportional gain.
摘要:
Improving the accuracy of the flow rate of a valve in a fluidic delivery device in which a desired flow rate may be achieved by varying the duty cycle of the valve. The flow rate of fluid delivery from the valve over its lifetime is stabilized by minimizing the voltage OPENING time of the valve to account for valve and piezoelectric actuator drift. Also, the valve OPENING time of one or more fluidic parameters that impact on the flow rate delivery by the valve and differ among fluidic delivery devices is compensated to optimize the flow rate accuracy.
摘要:
The invention relates to an actuator in the form of a plate, comprising at least two generators for producing an acoustic standing wave in the actuator, wherein the actuator has at least two main surfaces and a plane (S) of symmetry extending perpendicularly to the main surfaces, with respect to which plane of symmetry the generators are arranged symmetrically, and at least one friction element and/or at least one friction layer, which is/are provided for friction contact with an element to be driven, is/are arranged on a first, substantially flat lateral surface area of the actuator, and the first lateral surface area has a length (L) that substantially corresponds to the wavelength of the acoustic standing wave generated in the actuator. According to the invention, a second lateral surface area of the actuator has a length (B) that is greater than the wavelength of the acoustic standing wave generated in the actuator and not equal to a multiple of half the wavelength of the generated acoustic standing wave.
摘要:
The invention relates to a device for controlling a capacitive charge, in particular a piezoelectric actuator (2). Said inventive device comprises a signal generator (6) which is used to control a first end step (1) which is used to produce a discrete signal on the capacitive charge. The invention is characterised by a second end step (3, 4) which is used to generate a continuous signal on the capacitive charge. A counter-coupling of a deviation of an actual discrete signal is produced by a continuous signal required on the capacitive charge.
摘要:
Provided is a control apparatus of a vibration-type actuator for generating an elliptical motion of contact portions by a common alternating current including a frequency determining unit for setting a frequency of the alternating current. The frequency determining unit sets the frequency of the alternating current for changing an ellipticity of the elliptical motion, within a frequency range such that ellipticity changing frequency ranges set for the vibrators are overlapped, and the ellipticity changing frequency ranges are set for the vibrators as frequency ranges between an upper limit and a lower limit, such that the lower limit is a maximum resonant frequency at a time of changing the ellipticity, and the upper limit is larger than the lower limit and is a maximum frequency for the relative movement of the driving member.