584 results about "Electromechanical actuator" patented technology

The invention discloses a multi-mode sensing electromechanical actuator fault prediction system and a control method thereof, and relates to the field of intelligent maintenance of electromechanical integrated equipment. Comprising the following steps: S1, multi-mode sensor deployment and signal acquisition: cooperatively deploying a vibration sensor, a current sensor and a temperature sensor at a bearing, a motor winding and a driver of an electromechanical actuator; and S2, bionic pulse coding and time synchronization: converting the three-mode signal into a sparse pulse stream with time synchronization through a self-adaptive integral distribution model with dynamic threshold adjustment. Through bionic multi-mode sensing, brain-like edge calculation and dynamic fault-tolerant control, real-time health management of the high-precision electromechanical system is realized, the equipment reliability is remarkably improved, and the operation and maintenance cost is reduced. The method is suitable for industrial application with precise assembly requirements such as automobile welding lines, aerospace machining and metal 3D printing.

Aspects of the present invention relate to a diagnostic apparatus (100) for use in testing an electromechanical actuator system of a vehicle (500). The diagnostic apparatus comprises one or more controllers (110), and the diagnostic apparatus configured to: generate a torque demand signal (155) corresponding to a torque demand profile (300), the torque demand profile configured to cause actuators of the electromechanical actuator system to modify a suspension of the vehicle (402); transmit the torque demand signal to the electromechanical actuator system of the vehicle (404); record a suspension characteristic of the vehicle in response to application of the torque demand signal (406); and output the recorded suspension characteristic of the vehicle (408).

A system configuration significantly reduces the number of interconnections needed between an electromechanical actuator (EMA) and an EMA controller (EMAC) while maintaining redundancy and other safety aspects needed by the target application without adding second or third independent redundant position sensors to the EMA for use with backup channel of the controller. The system configuration extends the sensor architecture used by COM-COM controllers with an additional sensor channel used by a backup controller without the need for adding a separate physical position sensor for the backup controller, which saves implementation effort, space, and weight that would otherwise be needed for integration of additional redundant sensors into the EMA.

The invention particularly relates to a fault diagnosis method based on an evidence theory and a cascade neural network, and the method comprises the steps: collecting the current sensor data of an electromechanical actuator of edge end equipment, and carrying out the data preprocessing of the current sensor data, so as to obtain intermediate data; coding the intermediate data based on a preset window size and a sliding step number to obtain to-be-processed data; inputting the to-be-processed data into a trained edge end fault diagnosis model, performing feature extraction on the to-be-processed data by using a primary analysis network to obtain a first time sequence feature, and generating a first fault classification prediction result and a corresponding confidence coefficient parameter based on the first time sequence feature; comparing the confidence coefficient parameter with a preset uncertainty threshold value, and inputting the time sequence characteristic data into a secondary analysis network when the confidence coefficient parameter is greater than the uncertainty threshold value; and performing feature analysis on the first time sequence feature by using a secondary analysis network to obtain an output second fault classification prediction result.

An electromechanical actuator is integrated into a blackout or sun-shading device that includes a screen, top and bottom bars, and top and bottom winding shafts. The screen is between the bars. The top bar is connected to the top winding shaft by first cords. The bottom bar is connected to the bottom winding shaft by second cords. The electromechanical actuator includes first and second transmission devices and an electric motor that drives the shafts. The first transmission device connects to the motor and the top winding shaft and includes a first clutch. The second transmission device connects to the electric motor and the bottom winding shaft and includes a second clutch. When the motor is activated with only one clutch engaged, only one winding shaft is rotated. Moreover, when the motor is activated electrically and the clutches are engaged, the winding shafts are rotated by the motor.

Electromechanical Actuator and Blinding Device Comprising Such an Actuator. The present invention relates to an electromechanical actuator (10) of a blinding device (3), this actuator comprising at least one electric motor (12) configured to drive an output shaft (42) of the actuator in rotation about an axis of rotation (X10), an actuator head (38) forming a fixed point for the electric motor, a wireless remote communication module (24), an antenna cable (302, 304, 306) electrically connected to the communication module, a cover (50) attached to the actuator head (38), this cover defining a first face, facing the actuator head (38), and a second face (50B), opposite the first face. The cover defines, on its second face (50B), a housing (L50) for receiving a portion (302) of the antenna wire (30). Figure for the summary: Fig 2

An electromechanical actuator (200) for a braking system of a vehicle (V), particularly a railway vehicle, is described, characterized in that it includes a first control means (202) arranged to receive from a speed sensor means (204, 204′), associated with a wheel (w) of the vehicle, a speed signal having a value indicative of an angular speed of the wheel (w) of the vehicle.A braking system and a vehicle are also described.

An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25), and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50) and an output member (51). The output member (51) comprises a first bore (73). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear (40) of a reduction stage (38) of the gearbox. The drum (49) comprises a shoulder (90). Furthermore, a planet carrier (66) of the reduction stage (38) is configured to bear against the shoulder (90) of the drum (49).

The invention discloses a method (100) for operating an electro-hydraulic brake control unit (1) of a motor vehicle with several hydraulic output connections (4a-4d) for hydraulically actuated wheel brakes (5a-5d) and an electrically controllable first pressure source (2) for hydraulically pressurizing the wheel brakes (5a-5d), which is formed by a cylinder-piston arrangement with a pressure chamber (30) and a piston (31) as well as an electromechanical actuator with an electric motor (32), wherein, to generate a predetermined hydraulic pressure by means of the first pressure source (2), a basic motor torque is generated by the electric motor (32) and an oscillating motor torque is superimposed on the basic motor torque. The invention further discloses an electro-hydraulic brake control unit (1) which is configured to carry out such a method (100).

The invention discloses a fault intelligent identification method for an electromechanical actuator, and the method comprises the following steps: carrying out the normalization of fault simulation data of the electromechanical actuator, carrying out the slicing processing through a sliding window, and dividing the data into a training data set and a test data set according to a proportion; then, the training data set serves as input of a multi-scale liquid attention convolutional network model, the training data set is subjected to space fault feature extraction through multi-scale convolution, then time sequence fault features are added through a liquid time sequence processing module, meanwhile, a time attention mechanism is introduced to highlight important time steps, and finally, a classification output layer is used for classifying the time sequence fault features. A trained fault intelligent identification model is obtained; and finally, testing the trained fault intelligent identification model by using the test data set to obtain an electromechanical actuator fault intelligent identification result. In addition, the method is simple and easy to implement and suitable for fault feature extraction and recognition of the electromechanical actuator, and recognition accuracy and stability are remarkably improved.

An electromechanical actuator comprises a casing, an electric motor, a gearbox, a spring-applied brake (25) and a centring shaft (71). The brake (25) comprises a coil spring (48), a drum (49), an input member (50), an output member (51) and a bushing (76). The input member (50) comprises a first bore (72). The output member (51) comprises a first bore (73) and a second bore (74). The shaft (71) is mounted inside the first bore (73) of the output member (51) and a bore of a sun gear of a reduction stage of the gearbox. The bushing (76) comprises a bore (77), inside which the shaft (71) is mounted. The bushing (76) is mounted inside the first bore (72) of the input member (50) with an interference fit and inside the second bore (74) of the output member (51) with a loose fit.

Systems and methods are provided for fault detection, diagnosis, and recovery in an electromechanical actuator. The system can include a data processing system having one or more processors and a memory. The data processing system can receive first electrical data from a first sensor positioned at a first terminal of a power source, in addition to second electrical data from a second sensor positioned at a second terminal of the power source. The data processing system can determine a first average value from the first electrical data and a second average from the second electrical data. The data processing system can determine a difference between the first average value and the second average value. The data processing system can detect a fault impedance according to a pattern of the difference over a measured time interval. The data processing system can provide an indication of the fault impedance.

A brake system for a vehicle include first brake devices respectively provided in two vehicle wheels of a vehicle and configured to perform a braking operation by transmitted liquid pressure, second brake devices respectively provided in the other two vehicle wheels of the vehicle and configured to perform a braking operation by an embedded second electromechanical actuator, a reservoir, a master cylinder including a master chamber, and a master piston provided in the master chamber, a hydraulic actuator configured to generate the liquid pressure by an electrical signal outputted in response to a displacement amount of the brake pedal, a hydraulic circuit configured to control the liquid pressure to be transmitted to the first brake device, and an electronic control unit configured to control the first electromechanical actuator, the hydraulic actuator, and the hydraulic circuit so that the first brake device and the second brake device generate braking forces.

The electro-mechanical actuator of a wind turbine is configured to be powered from a DC link intermediate circuit. A method for controlling the actuator includes: determining whether a voltage demand and a power demand for operating the electro-mechanical actuator at a specific operating point can be met by an output of a first converter. The first converter is connected to a supply grid and configured to provide a first voltage and a first power to the DC link intermediate circuit; and, when the voltage demand and the power demand cannot be met, triggering a boost mode of a second converter connected between the DC link intermediate circuit and an energy store. The boost mode is triggered to: boost the voltage at the DC link intermediate circuit to a second voltage; and, boost the power supply to the electro-mechanical actuator via the DC link intermediate circuit to a second power.

An emergency autoland braking system for aircraft includes an electromechanical actuator configured to provide a braking force to rudder pedals for actuating a braking system without altering the existing braking system of the aircraft. An equalized braking force may be applied to both rudder pedals via a force balancing mechanism and a single linear actuator, or differential braking force may be applied via independent linear actuators. The system is compatible with both open and closed loop control for commanding a braking force.

The invention relates to a microelectromechanical actuator structure comprising a microelectromechanical chip with a chip frame and a drive structure. The drive structure comprises a dopable material. The drive structure includes a first drive unit and a second drive unit. The first drive unit comprises a first substrate and a first electrode structure. The first substrate has a first doping. The first electrode structure has a doping inverse to the first doping. The second drive unit comprises a second substrate and a second electrode structure. The second substrate has a second doping. The second electrode structure has a doping inverse to the second doping. Thus, a pn junction is formed between each of the substrates and the second electrode structures. The first electrode structure comprises at least two first electrodes.The second electrode structure has at least one second electrode. The first electrodes are arranged horizontally next to each other in a first electrode plane. The second electrode is arranged horizontally in a second electrode plane.

The present invention relates to a method for controlling the braking device (2) of a vehicle having at least one drum brake (4; 6), which can be used as a service brake via an electromechanical actuator device (16) and as a parking brake via a locking device (30) for selectively locking the electromechanical actuator device (16), with the method steps of determining an overload condition caused by a change in the brake temperature, in which overload condition, when the actuator device (16) is locked, an application force (24) of the drum brake (4;6) is greater than a predetermined parking force limit, and overcoming the overload condition by: generating an actuating force (22) by the electromechanical actuator device (16) while at least partially relieving the locking device (30), releasing the locking of the actuator device (16), and subsequently resetting the actuator device (16) against the direction of the actuating force, and locking the reset actuator device (16) by the locking device (30). The present invention further relates to a braking device (2) of a vehicle.;

The invention discloses an adaptive model prediction control method for an aviation electromechanical actuator, relates to the technical field of aviation electromechanical actuators, and designs a corresponding gear clearance torque and friction torque current compensation method by adopting a simplified dead zone model and a LuGre friction model. By organically combining gear backlash compensation and friction compensation and redesigning a control law, the invention provides a control strategy combining feed-forward compensation and model prediction control, and the q-axis current of the system is accurately compensated and controlled; furthermore, an extended Kalman filter is introduced to carry out on-line identification of multiple parameters of the permanent magnet synchronous motor, a high-precision parameter identification result is obtained, and it is ensured that the model parameters of the system can be updated in real time in the control process, so that accurate control over the system is achieved.

A barrier device for a locking device is provided with a stator, with a rotor with a rotor axis and with an electromechanical actuator in the rotor. The rotor has two rotor elements, with the first rotor element and the second rotor element being arranged axially one behind the other in relation to the rotor axis. The two rotor elements are connected to each other in a rotationally fixed manner. The electromechanical actuator is arranged in one of the rotor elements. A locking device is provided with a locking device housing and the barrier device. The barrier device is received in the locking cylinder housing. In particular, the locking device includes a fastening element which is inserted from the outside into the locking device housing in order to fasten the stator to the locking device housing in a rotationally fixed manner.

An electromechanical actuator including an electric motor housed in a housing, the electric motor acting on a torque output element capable of being coupled to an element of a transmission gearbox of a motor vehicle. The torque output element is connected to the electric motor by drive means, and the torque output element is a main shaft configured to rotate about its axis of rotation with a first end and a second end. The actuator further includes a circuit board located in the housing, the circuit board comprises a sensor which faces a magnet mounted on a support coupled to the second end of the main shaft by means of a first swivel-linear mechanism.

The invention belongs to the technical field of aviation unmanned aerial vehicle flight control, and discloses an unmanned aerial vehicle all-electric flight control actuation system which comprises a plurality of dual-redundancy actuator controllers and a plurality of electrical dual-redundancy electromechanical actuators. And the actuator controller receives a flight management control instruction, solves an electromechanical actuator control instruction through a main and standby channel dissimilar control algorithm, and drives the electromechanical actuator to drive a control surface to deflect, so that aircraft attitude control is realized. The safety problem of an existing unmanned aerial vehicle flight control actuation system is solved, it can be ensured that when control of any control surface fails, the remaining control surfaces can be driven to have the aircraft attitude compensation capacity, and therefore high reliability and high safety are achieved.

An electro-mechanical actuator for a valve can have a collar configured to envelope a portion of a commercially available liquid coupler. The collar can engage a region of the liquid coupler and a bias member can urge the collar to displace a movable member of the liquid coupler and thereby to break a coupling. A dowel can retain the collar against the force applied by the bias member and a tension member can, under threshold tension, retract the dowel, releasing the collar to move under influence of the bias member. Other valves have a gate element coupled with an armature to rotate the gate element under an electromagnetic field. The gate element can define a recess and a retainer can reside in the recess. As the gate element rotates, the retainer can align with a longitudinal segment of the recess and allow the gate element to displace longitudinally.

An electromechanical actuator architecture is provided for a cowl door of an aircraft engine nacelle. The electromechanical actuator architecture includes a first clutch, a no-back unit including a friction clutch and a one-way clutch and a ball screw with two coaxial external cylinders. Torque generated for actuator extension is transferable to the ball screw and the coaxial external cylinder via the first clutch. During actuator retraction, cowl door weight and an aerodynamic load compress the coaxial external cylinder and the ball screw with loads that are transferred to the no-back unit, which is configured to maintain actuator position in an event generation of the torque ceases.

A rotary electromechanical actuator (EMA) includes: a first EMA part comprising a first electric motor and a first rotary shaft (S1) extending along an axis and arranged to be rotated about the axis by the first electric motor, and a first 1st stage gearbox providing a geared transmission from the first electric motor to the first output shaft, and a first brake assembly for applying a braking force to the first output shaft; the EMA further comprising: a second EMA part comprising a second electric motor and a second rotary shaft (S2) extending along the axis and arranged to be rotated about the axis by the second electric motor, and a second 1st stage gearbox providing a geared transmission from the second electric motor to the second output shaft, and a second brake assembly for applying a braking force to the second output shaft.

The claimed group of inventions relates to a field of anatomical engineering, and it relates to a mechanical finger and an actuator therefor, which may be used in imitators and prostheses of upper limbs. The mechanical finger is a structural element that performs a gripping function, consists of movable phalanxes, elements for modifying their position relative to each other, and a driving rope that is connected to a lead nut that is, in turn, intended to interact with an electromechanical actuator that transmits a force to the mechanical finger. According to the invention, the rope is fixed on the lead nut and divided into two portions which are arranged symmetrically relative to a sagittal plane of the proximal phalanx and laid on the guides. Therewith, cavities are provided in locations of the rope which are configured to receive loops of the rope, and a length of each of them equals to a travel length of the lead nut. The actuator is a power module that is aimed to drive and to control a movement of the mechanical finger. It consists of a motor reducer having a front shaft with a lead screw mounted thereon, the lead screw is configured to be coupled to the lead nut, and an encoder that is configured to enable a connection to the contact board of the artificial wrist, thereby powering the motor reducer and transmitting pulses. The actuator and the mechanical finger are individual modules of the artificial wrist which together form a single module.

The invention relates to a mechanism output torque control method based on an electromechanical actuator, and belongs to the technical field of servo control. Building an electromechanical actuator transmission system; the tail end of the transmission mechanism is driven to complete a complete movement process; the actuating distance of a push rod of the electromechanical actuator and the angle of the tail end of the transmission mechanism relative to the horizontal direction in the whole movement process are measured, and relation calibration is carried out; performing relation calibration on the thrust of the electromechanical actuator and the torque of the tail end of the corresponding transmission mechanism; performing relation calibration on the thrust of the electromechanical actuator and the input current data of the electromechanical actuator; semi-closed-loop control is realized by controlling the input current of the electromechanical actuator and the torque at the tail end of the transmission mechanism; according to the invention, a five-order polynomial model fitting mode is adopted, indirect detection of the load torque is realized, and the problem of accurate control of the output torque when no torque feedback exists is solved.

An anti-theft device for securing an article of merchandise against unauthorized removal from a display counter. The anti-theft device has a pedestal with a quick-release interface. The pedestal has an appendage positioned within a slot of the display counter. An actuation module is positioned underneath the display counter and couples to the appendage of the pedestal. A securing bracket attaches to merchandise and has a latch plate configured to couple to the quick-release interface of the pedestal. A latch disposed within the pedestal engages the latch plate to lock the securing bracket relative to the quick-release interface. An electromechanical actuator is housed within an actuation module and is operatively connected to the latch. Upon actuation, the electromechanical actuator disengages the latch from the latch plate, thereby releasing the securing bracket from the pedestal.

The invention discloses a cabin door electromechanical actuator with energy absorption and displacement compensation functions and a method, and relates to aerospace equipment and related fields, the cabin door electromechanical actuator comprises a shell, a lead screw, a lead screw nut, a belleville spring and a wave spring, the shell is provided with a mounting groove, the lead screw is mounted in the mounting groove, and the belleville spring is mounted in the mounting groove relative to the shell; the lead screw has the freedom degree of moving in the axis direction of the lead screw and the freedom degree of rotating around the axis of the lead screw. An elastic mechanism deforming in the axis direction of the lead screw is arranged between the lead screw and the shell. The shell is provided with a driving structure used for driving the lead screw to rotate. The lead screw nut is arranged outside the lead screw in a sleeving mode and is in threaded connection with the lead screw. The lead screw nut is in sliding connection with the shell in the axis direction of the lead screw nut. The shell is connected with the cabin body, and the lead screw nut is connected with the cabin door. The device has energy absorption and buffering effects, and provides corresponding displacement compensation capability for a servo mechanism at the same time.

The invention discloses an active-disturbance-rejection control algorithm of an aviation electro-mechanical actuator for a heavy-load and large-disturbance scene. The active-disturbance-rejection control algorithm comprises the following steps: step 1, establishing a first-order nonlinear active-disturbance-rejection vector control method framework for motor control; 2, establishing a mathematical physical model of an open-loop system of the permanent magnet synchronous motor; step 3, establishing a speed loop active disturbance rejection controller; step 4, establishing a position loop first-order active disturbance rejection controller; step 5, establishing a current loop active disturbance rejection controller; step 6, based on a Landau discrete recursion method, adding a rotational inertia identification algorithm into the speed loop active disturbance rejection controller in the step 3; 7, establishing a load torque observer based on an integral sliding mode, and introducing the torque observer into the speed loop active disturbance rejection controller in the step 3; and step 8, optimizing the speed loop active disturbance rejection controller in the step 3. According to the method, the influence of the external environment is fully considered, the adaptability of the system is greatly improved, and the situation of large load and large disturbance can be effectively dealt with.

A latch assembly (10a; 10b) comprising a base structure 10b(12 ); an elongated latch slider (14a; 14b) including a slider feature (62a; 62b) and being slidable between a free position (18) and a latching position (40); and a lock device (26) including an electromechanical actuator 22(72 ) and a lock element (74a; 74b) movable by the actuator between an unlocked position (92), and a locked position (96) for engaging the slider feature to prevent movement of the latch slider from the latching position to the free position; wherein the lock device further comprises a drive feature (76) driven by the actuator; wherein the lock element comprises a driven feature (86) arranged to be contacted and driven by the drive feature; and wherein a base clearance (98) between the lock element and the base structure is smaller than a drive clearance (104) between the drive feature and the driven feature.