86results about "Magnetostrictive device details" patented technology

The invention describes rolled electroactive polymer devices. The invention also describes employment of these devices in a wide array of applications and methods for their fabrication. A rolled electroactive polymer device converts between electrical and mechanical energy; and includes a rolled electroactive polymer and at least two electrodes to provide the mechanical/electrical energy conversion. Prestrain is typically applied to the polymer. In one embodiment, a rolled electroactive polymer device employs a mechanism, such as a spring, that provides a force to prestrain the polymer. Since prestrain improves mechanical/electrical energy conversion for many electroactive polymers, the mechanism thus improves performance of the rolled electroactive polymer device.

The invention ris an actuating drive for deflecting an actuating element by a solid body actuator (2) which, when an electrical voltage or an alternating magnetic field is applied, experiences a length change. A housing (1) encloses the solid body actuator to define an interspace (13) in a fluid-tight manner. Furthermore, the solid body actuator includes a hollow duct (6) having one end connected to a first hollow conduit (20) passing through the housing and the other end opening into the interspace. The interspace is additionally connected in a fluid-tight manner to a second hollow conduit (21) passing through the housing.

Systems and methods for flaw detection and monitoring at elevated temperatures with wireless communication using surface embedded, monolithically integrated, thin-film, magnetically actuated sensors, and methods for fabricating the sensors. The sensor is a monolithically integrated, multi-layered (nano-composite), thin-film sensor structure that incorporates a thin-film, multi-layer magnetostrictive element, a thin-film electrically insulating or dielectric layer, and a thin-film activating layer such as a planar coil. The method for manufacturing the multi-layered, thin-film sensor structure as described above, utilizes a variety of factors that allow for optimization of sensor characteristics for application to specific structures and in specific environments. The system and method integrating the multi-layered, thin-film sensor structure as described above, further utilizes wireless connectivity to the sensor to allow the sensor to be mounted on moving components within the monitored assembly.

Existing magnetoelectric materials relying on the use of metallic or ceramic magnetostrictive materials and ceramic piezoelectric materials as their constituent phases may have three problems. First, the operational frequency may be limited to a few kilohertz due to the presence of eddy-current losses in the metallic magnetostrictive phase. Secondly, it may be difficult to machine and fabricate devices due to the mechanical brittleness of the ceramic and some metallic magnetostrictive phases as well as of the ceramic piezoelectric phase. Thirdly, it may be difficult to tailor and optimize the properties (i.e., magnetoelectric voltage coefficient α_E, etc.) of the devices due to the limitation of the types of the constituent materials. This invention provides a magnetoelectric element including at least one set of alternative piezoelectric layer and magnetostrictive composite layer. The magnetostrictive composite layer includes at least one magnetostrictive material dispersed in first concentrated zones within a first polymer matrix, wherein all of said concentrated zones are orientated along a first direction. It is found that the conversion efficiency (i.e., α_E) varies in accordance with applied magnetic control field H_control in magnetoelectric devices made of such a magnetoelectric element.

The invention relates to a circuit arrangement for the dynamic control of ceramic solid-state actuators, such as piezotranslators with energy recovery by means of magnetic intermediate stores and/or storage capacitors as well as by clocked switches. For achieving a predetermined linear voltage characteristic at the piezotranslator, according to the invention, a single inductive intermediate store is arranged in the secondary circuit, which is connected in series with the piezotranslator, and the secondary circuit is designed as a half-bridge. The switches provided in the respective half-bridge are controlled at a high cycle or switching frequency by an external controller, with the series connection of piezotranslator and inductive intermediate store furthermore carrying a superimposed bridge direct current in order to ensure the desired charging of the capacitance of the piezotranslator, on the one hand, and to optimize the energy recovery, on the other hand.

An actuator includes a solenoid with a ferromagnetic nucleus which slides inside the solenoid. The nucleus is combined with a rod appropriate for interacting with a turbocharger's pivot point. The actuator is provided with a sensing system of the position of the ferromagnetic nucleus in the solenoid. The actuator also includes an electronic circuit which:—on the way in receives at least the signal from the engine's electronic control unit and the feedback signal, connected to the position of the ferromagnetic nucleus of the solenoid;—on the way out it distributes the electric current, connected to the entry signals, with which it feeds the solenoid.

The invention provides a micro-nano thin film magnetosonic antenna comprising a pedestal. The middle portion of the upper surface of the pedestal is provided with a cavity; the bottom and the side wall of the cavity and the upper surface of the pedestal are provided with insulation layers connected to a whole; a supporting layer is arranged on the insulation layer on the upper surface of the pedestal; the middle portion of the supporting layer is arranged over the cavity in a suspended manner; a magnetism-sound-electricity coupled structure consisting of magnetostrictive thin films and a thinfilm bulk acoustic wave resonator is arranged on the supporting layer; the magnetism-sound-electricity coupled structure is located right above the cavity; each magnetostrictive thin film consists ofmultiple magnetostrictive thin film layers and multiple buffer layers, wherein the number of the magnetostrictive thin film layers and the number of the buffer layers are the same and the magnetostrictive thin film layers and the buffer layers are arranged in an alternate manner. While being miniaturized, the antenna has better performance than conventional electric antennas.

The invention belongs to measuring and controlling technique filed of electromechanic system, relates to realizing method and control system based on self-apperceive performer of double-direction electromechanic transducing material. Time division multiplexing decoupling and control system of self-apperceive performer adopts double-direction transducing element, using switching sequence control circuit to control double-direction transducing element as sensor or performer, when the double-direction transducing element is as the sensor, it used sensing switch, when the double-direction transducing element is as the performer, it used executing switch, it uses discharging switch to discharge the double-direction transducing element, the three switches are conducted or closed under control of switch sequence control circuit. The invention decreases volume and weight of electromechanic system, and makes structure controlled integrated and micromated, decreases difficulty of craftwork and installation; it is controlled in parity, increases stability of control. It fits for structure libration initiative control, system identification and health diagnosis, especially fits for flexible structure whose volume and weight are limited.

The invention comprises: a magnetostriction component, a central pipe eradiator, a driving coil, a closed case, a cooling media channel, a bias magnet, a forced cooling mechanism. A group of magnetostriction materials is laminated to form ring-shaped or sector-shaped driving component; on the lamination there is a sector-shaped or hole-shaped window opened; the central pipe eradiator is connected to the radiating face of the magnetostriction component; the driving coil for generating magnetic field is located on the group of laminations; on the closed case there are an entrance and outlet of cooling media and a connector of magnet field power.

An actuator device having an expansion unit (10), which comprises a magnetically active shape memory alloy material (12) and which carries out an expansion movement from a starting position along an expansion direction as a reaction to an energization of a coil device (30) and interacts with restoring means which exert on the expansion unit (10) a restoring force opposite to the expansion direction, wherein the restoring force has permanent magnets which act or are seated on a section of the expansion unit (10) such that the restoring force generated magnetically by the permanent magnets changes with increasing expansion stroke in the expansion direction, wherein the permanent magnets (16, 34, 40, 52, 54) are embodied and/or designed such that the expansion unit (10) can contract into the starting position along the expansion stroke when the coil device (30) is not energized.

The invention provides a cantilever magnetic sensor. The sensor comprises a base and a cantilever beam, wherein one end of the cantilever beam is fixed on the base, and the other end of the cantileverbeam is a free end; a magnet is arranged on the cantilever beam; and the cantilever beam vibrates under the act of a vibrating source in the working state, the frequency and amplitude of vibration are changed due to the magnetic torque generated by the magnet when an external magnetic field acts on the magnet, and the magnetic field can be detected by detecting the frequency and amplitude of thevibration. The magnetic sensor is simple in structure, and can realize high-sensitivity magnetic field detection.

The invention relates generally to electroactive material actuators (and combined sensor-actuators) having embedded magnetic particles (42) for facilitating enhanced actuation and/or sensing effects.

A method of producing a piezoelectric/electrostrictive device having a base including a pair of movable parts opposing each other, a fixing part that connects the movable parts with each other at one end thereof, and mounting parts that extend for a predetermined length while holding slit-shaped gaps of a predetermined width along inside surfaces of said movable parts by being turned around at the other end of said movable parts, said piezoelectric/electrostrictive device having a piezoelectric/electrostrictive element disposed on at least one outside surface of said movable parts of said base, wherein a base block obtained by laminating and calcining a large number of ceramic green sheets is adopted as a material for forming said base, and the base including said movable parts, said fixing part, and said mounting parts is formed by cutting said base block at a predetermined site along a lamination direction of said ceramic green sheets.