224 results about "Magnetostrictive actuator" patented technology

An acoustic logging apparatus comprises a drill collar conveyed on a drilling tubular in a borehole within a formation. At least one transmitter is disposed in the drill collar. The transmitter includes at least one magnetostrictive actuator cooperatively coupled by a flexure ring to a piston for converting a magnetostrictive actuator displacement into a related piston displacement for transmitting an acoustic signal in the formation.

An electromechanical transducer formed by an electrical and mechanical combination of a piezoelectric device and a magnetostrictive device. The two devices are electrically coupled so that their capacitive and inductive reactances approach a balance to provide an essentially resistive combined input at a selected frequency. Efficiency of circuits driving the transducer is improved. The devices are mechanically coupled so that the mechanical outputs add or reinforce each other. Two transducer pairs may be used in a two frequency telemetry system with each pair tuned to one of the frequencies for optimal reactance balancing and transduction efficiency.

A fuel injector (1), in particular a fuel injector for fuel injection systems of internal combustion engines, has a piezoelectric or magnetostrictive actuator (3) and a valve closing body (12) which can be actuated by the actuator (3) via an actuating path (6, 24, 10, 9), the valve closing body (12) working together with a valve seat surface (13) to form a sealing seat. A gap (24) is formed in the actuating path (6, 24, 10, 9) in the non-energized rest state of the actuator (3).

A portable audio drive unit has a case, an audio signal output section that outputs an audio signal, and a magnetostrictive actuator that drives on the basis of the audio signal output from the audio output section. The magnetostrictive actuator includes a displacement transfer section. The displacement transfer section has a driving rod. The displacement transfer section transfers a displacement of the driving rod. The magnetostrictive actuator is arranged in the case with the displacement transfer section being protruded from the case or being retractable into the case.

A fuel injector, in particular a fuel injector for fuel-injection systems of internal combustion engines, including a piezoelectric or magnetostrictive actuator, actuates a valve-closure member formed on a valve needle via a hydraulic coupler, the valve-closure member cooperating with a valve-seat surface to form a valve-sealing seat. The coupler includes a master piston and a slave piston which are connected to a pressure chamber, and at least one coupler-spring element which in each instance produces a prestressing force on the master piston, counter to a working direction, and on the slave piston, in a working direction. The pressure chamber of the coupler is connected to a fuel inflow in the flow-through direction to the pressure chamber via an inflow bore and a check valve.

The invention discloses a vibration isolation device. The invention comprises a working platform and a supporting platform, a plurality of magnetostrictive actuators are arranged between the working platform and the supporting platform, an acceleration sensor is arranged on the working platform. The acceleration sensor detects the vibration signal of the working platform, and transmits the signal to the control module, and the control module controls the actuation of the magnetostrictive actuator according to the signal, to balance out the vibration of the working platform. Rubber dampers are used to connect the magnetostrictive actuators and the supporting platform. A cooling device is arranged on the magnetostrictive actuators. The vibration isolation capability is high, and the vibration isolation effect is good.

The invention relates to a Backlash operator and neural network-based adaptive filter and a method for modeling a creepage and hysteresis system and relates to the technical field of nonlinear hysteresis and creepage system modeling. The Backlash operator and neural network-based adaptive filter comprises a creepage module, a plurality of Backlash operator modules with the same width, a neural network module and an error calculation module. The design method for the adaptive filter is simple and practicable, delay items are avoided, the output of the filter is only related to the current input, and the hysteresis linearity can be reflected simultaneously. Meanwhile, the output of a Backlash operator serial structure is connected with the neural network, the weight can be adjusted in real time, massive sample data is not needed to be prepared in advance, and the modeling accuracy can be greatly improved. The method is suitable for modeling a piezoelectric ceramic actuator, a magnetostrictive actuator, an excited motor and other systems with hysteresis and creepage nonlinear characteristics.

The invention discloses a permanent magnet dual-coil-driven giant magnetostrictive actuator, which belongs to the technical field of hydraulic servo control. The actuator comprises an outer cover (3), a first end cover (2), a second end cover (12), a bobbin (19), a giant magnetostrictive rod (16), an output rod (14) and a preloaded spring (15). A bias magnetic field generation unit and a driving magnetic field generation unit are arranged on the bobbin (19). The actuator is characterized in that: the bias magnetic field generation unit comprises a bias adjustment coil (8) and a permanent magnet (5); and the driving magnetic field generation unit comprises a drive coil (9). The novel giant magnetostrictive actuator has the remarkable characteristics of high displacement output accuracy, quick response, low heat, intellectualization, bias magnetic field adjustability, preloading force mechanical/electronic joint adjustability and the like.

A fuel injector for fuel-injection systems of internal combustion engines having a piezoelectric or magnetostrictive actuator, includes a hydraulic coupler which actuates a valve-closure member (3) formed on a valve needle. The valve-closure member cooperates with a valve-seat surface to form a valve-sealing seat. The coupler includes a master piston and a slave piston which are guided in bores of a guide sleeve. Located between the master piston and the slave piston is a pressure chamber filled with a hydraulic fluid. A corrugated tube is positioned around the guide sleeve which is sealingly joined to the master piston at one end and to the slave piston at the other end, and which seals a supply chamber for the hydraulic fluid from a surrounding fuel chamber.

In order to obtain improved magnetic track density, it is desirable to bring the read and write elements as close to the recording surface as possible, short of actually touching it. This has been achieved by utilizing a magnetostrictive actuator, comprising single or multiple pairs of magnetostrictive elements and their associated conductor coils. A magnetic field is generated by passing electrical current through the conductor coils. This field will saturate the actuator and cause the magnetostrictive elements to contract or expand, thus moving the read/write element whenever so desired.

The invention relates to a high-speed switch valve, in particular to a high-speed electrohydraulic switch valve driven by an giant magnetostrictive actuator, which solves the problems of the prior actuator in the switch valve that the temperature rise of a magnetostrictive rod is restrained, the structure is complicated, the design is not reasonable, the dynamic response speed is slow, the control precision is low and the drive efficiency is low. A coil frame (2) is sleeved on the magnetostrictive rod, a drive coil is wound on the coil frame (2), a liquid flowing inlet (24) is disposed on a side wall of an actuator casing, a liquid flowing outlet (23) is positioned on the side wall of a valve core (9), the liquid flowing inlet (24) is communicated with the liquid flowing outlet (23) through an axial hole (4-1) of the magnetostrictive rod (4) and the actuator casing (1) is sealed with a valve body (8). The high-speed switch valve has the advantages that the temperature rise of the magnetostrictive rod can be restrained, the structure is simple, the design is reasonable, the dynamic response speed is fast, the flow rate control precision is high and the switch frequency is high.

A positive displacement pump includes a magnetostrictive actuator. A single actuator drives multiple pumping chambers. The pump may include two pumping chambers driven in phase by the linear expansion of the actuator at both its ends. The pump may include a third pumping cavity, driven by the transverse expansion and contraction of the actuator, out of phase with either cavity driven by the lengthwise extension of the actuator. A pump assembly having multiple pumps each including a magnetostrictive element is also disclosed.

An actuator for a primary control surface of an air-craft, the actuator comprising at least one motor of the vibration type mounted in series with at least a second motor which is a piezoelectric, electrostrictive, or magnetostrictive actuator of the direct type, and further including control means causing one or both of the motors to operate in such a manner that the second motor drives movements of the control surface of the type used for stabilizing the aircraft, while the vibration drives movements of greater amplitude.

The invention relates to a braking device that comprises an electric motor (1) capable of acting with the means (2) for the quick movement of the pads (3) into contact with a disk (4) or a drum, and a magnetostrictive actuator capable of generating a clamping force on the pads and against the disk or the drum. The magnetostrictive actuator comprises at least one winding (5) of a magnetic material on a holder (5a).

A giant magnetostrictive actuator with permanet torque output and a control method thereof belong to the magnetostrictive actuator field, and particularly relate to a giant magnetostrictive actuator with permanet torque output which uses a giant magnetostrictive rod as the core element and a control method thereof. The giant magnetostrictive actuator is in an axisymmetric structure, wherein a barrel-shaped cylinder is arranged at the bottom of the circular cavity of a barrel-shaped shell which is provided with a circular boss at the bottom and a circular groove in the center; a lower magnetizer is arranged at the bottom of the circular cavity of the cylinder; and a cylindrical magnet yoke is arranged on the upper part of the lower magnetizer. The control method of the giant magnetostrictive actuator comprises the following steps: firstly establishing a permanent torque output control module of the giant magnetostrictive actuator, and secondly using a giant magnetostrictive positive effect model, a giant magnetostrictive inverse effect model and a giant magnetostrictive material elastic modulus model to eliminate the coupling effect of the magnetostrictive positive effect and inverse effect in the giant magnetostrictive rod and ensure that the giant magnetostrictive actuator can complete permanent torque output under the combined action of the current in a coil and an external force.

The invention discloses a magnetostrictive actuator based switch flow control type microdroplet injection device. The device comprises a control system, a spraying cavity with a spraying opening, a nozzle, a liquid storage tank and a compressed air supply module, wherein the nozzle is connected with the spraying opening of the spraying cavity, the liquid storage tank is connected with the spraying cavity, the compressed air supply module is connected with the spraying cavity and the liquid storage tank, a push rod is arranged inside the spraying cavity, one end of the push rod is matched with the spraying opening of the spraying cavity, and the other end of the push rod is provided with the magnetostrictive actuator which drives the push rod to move axially. According to the device, compressed air provided by the compressed air supply module serves as a power source for liquid spraying and liquid feeding of the spraying cavity, liquid drop spraying is conducted through squeezing of liquids by the compressed air, the spraying force is large, a liquid material of the high viscosity can be sprayed on the condition of the same inner diameter of nozzles, the range of applicable materials is wide, and the nozzle is not blocked easily. In a high-temperature environment, the device can work continuously for a long time and is applicable to spraying of liquids of the high viscosity, high in drop spraying frequency, high in volume controllability and good in consistency.

The invention discloses a two-stage electro-hydraulic servo valve based on a giant magnetostrictive electro-mechanical actuator GMA and belongs to the technical field of hydraulic servo control. The two-stage electro-hydraulic servo valve comprises a valve body (3), a valve core (4), a left spray nozzle (6), a right spray nozzle (7), a hinged baffle (11), a feedback rod (5) and a giant magnetostrictive actuator. The giant magnetostrictive actuator comprises a left end cover (9), a centering and adjusting screw (8), a centering spring (10), an end cover (13), a right end cover (21), a butterfly-shaped spring (14), an output rod (15), an adjusting screw (22) and a giant magnetostrictive rod (19). The output rod (15) is connected with the hinged baffle (11); and through the hinged baffle (11) with one fixed end, the amplification and the transfer of displacement are realized. A force feedback secondary servo valve is formed by the hinged baffle (11) with a displacement amplification function, the feedback rod (5), a prestage spray nozzle-baffle valve and a power-stage slide valve. The two-stage electro-hydraulic servo valve based on the giant magnetostictive electro-mechanical actuator GMA has the characteristics of quick response, high frequency response, high control flow rate and the like.

A fuel injector has a piezoelectric, electrostrictive or magnetostrictive actuator, a valve needle, which is in operative connection with the actuator and acted upon with a restoring force by a valve spring in a closing direction to actuate a valve-closure member; and an hydraulic coupler which encompasses a piston that at least partially engages in a receiving opening and forms a coupler gap therewith, which is filled with an hydraulic fluid; a cavity being formed in the piston, which is open toward the coupler gap and at least partially filled with the hydraulic fluid and forms a compensating chamber.

A dual-nut ball screw assembly with controllable pre-tightening force comprises a screw and two screw nuts; the screw nuts are both connected to the screw; one screw nut is provided with a pre-tightening nut; super-magnetostrictive actuators evenly distributed in the peripheral direction are connected between the other screw nut and the pre-tightening nut; one end of each super-magnetostrictive actuator is provided with a force sensor; the pre-tightening nut is used for setting initial pre-tightening force of the assembly; the magnitude of the pre-tightening force is limited to one-third of a load. The pre-tightening force of the screw and the nuts is increased or decreased through expansion of super-magnetostrictive expansion rods, the screw is automatically tightened with safety and reliability ensured, and transmission precision retentivity and reliability of the assembly is improved.

An active vibration damper for lathe is composed of an arbor chuck with cutter, a tool carrier with an arbor chuck fixer on its head and an empty cavity in its tail, a super magnetostrictive executor arranged in said empty cavity and with an output rod connected to said arbor chuck, a high-accuracy vibration sensor arranged on arbor chuck, and a controller connected electrically to said vibration sensor and executor. It can play its vibration damping role in the 5-300 rpm range and has a fast response time less than 0.1 S. Its method is also disclosed.