Cedrat Technologies

Figest B.v.

Other

Thales

Compagnie Generale Des Etablissements Michelin

Decrat Technologies

Cedrat-recherche

Skis Rossignol

Frank Claeyssen

Ronan Le Letty

Francois Barillot

Nicolas Lhermet

Timothée Forissier

Denis Martin

Thomas Ledoux

Nicolas Puget

Christophe Devilliers

Guillaume Heredia

Julien Ducarne

Alexandre Pernot

Norbert Beyrard

François Barillot

Paul Gonnard

Félix Aguilar

Alexandre Pages

Gérald Aigouy

Alexandre Pagès

Kevin Benoit

Nicholas Lhermet

Laurent Lebrun

Marie-Madeleine Guillemot-Amadei

Nabil Bencheikh

Alexandre PAGÈS

Grégory Magnac

The actuator comprises a movable armature swivelling with respect to a stator provided with flanges on which magnets are fitted and a coil fitted around one of the flanges. The magnets have an axial magnetisation in a z axis and are aligned in an x axis. The movable armature is arranged between the magnets in the x axis. The movable armature is mounted on a guide imposing swivelling around a y axis perpendicular to the x and z axes. The movable armature is separated from the magnets by air-gaps. Each magnet forms a static magnetic circuit with one end of the movable armature and one of the flanges. The coil forms a dynamic magnetic circuit with the ends of the movable armature and the flanges.

Magnetic actuator and mechatronic system

The ultrasonic tubular transducer is activated at the centre thereof by two symmetrical electromechanical converters. The vibration generated by the two electromechanical converters is converted and then transmitted to the tube via a coupler. The ultrasonic transducer can be vibrationally isolated from the interfaces thereof by caps equally suitable for connecting the transducer to a stationary frame, a free end or another similar ultrasonic transducer. A device for pre-stressing electromechanical converters has a hole bored at the centre thereof in order to allow cables from the transducer as well as from adjacent transducers to pass therethrough.

Modular, submersible ultrasonic tubular transducer

A system, which is structured to evaluate a condition of a tire, includes a housing, a tire-wear detector, a tire-presence detector, and an electronic activator. The housing, when the system is deployed, is placed on a ground surface. The tire-presence detector detects a presence of a tire on the housing. The electronic activator activates the tire-wear detector when the tire-presence detector detects the presence of the tire on the housing. The tire-wear detector, when activated, detects a wear condition of the tire when the tire passes over the housing.

System for evaluating the condition of a tire

A nanometer-scale precision actuator comprises a base, an intermediate structure, an output interface, and two linear elements producing a controllable extension in the same longitudinal direction, each between a first and a second end. A first of the two elements has a first end fixed onto the intermediate structure and a second end fixed onto the base, a second of the two elements has a first end fixed onto the intermediate structure and a second end fixed to the output interface. The base and the intermediate structure are positioned in such a manner that the controllable extension of the second element produces a displacement of the actuator in a first direction and the controllable extension of the first element produces a displacement of the actuator in a second direction, opposite to the first direction, with respect to the base.

Precision return actuator

The invention relates to a fine positioning system using an inertial motor based on a mechanical amplifier that comprises a first amplified inertial sub-assembly including a mechanical amplifier, a piezoactive member and a countermass. A second relative drive sub-assembly includes a clamp and a clamped member attached to the first amplified inertial sub-assembly. Asymmetric excitation cycles of the first inertial sub-assembly generate impact forces and movements amplified in a driving direction (z), thus resulting in sliding and adhesion successions of the clamped member in the clamp in order to generate a relative translation movements of the points A and B relative to the point D. The mechanical amplifier increases the step size and reduces the supply inrush currents. Fine and dynamic positioning of the point B relative to the point D can be achieved with augmented strokes using the amplifier.

Fine positioning system using an inertial motor based on a mechanical amplifier

The inventive circuit breaker-contactor () comprises a fixed contact, a contact () movable () with respect to the fixed contact between open and closed positions, means () for displacing the movable contact () in the closed position thereof, means () for displacing the movable contact in the open position. According to said invention, said circuit breaker-contactor comprises means () for locking the movable contact () in the closed position thereof, a piezo-electric actuator () deformable from a rest position to an operating position for displacing the locking means () in such a way that the movable contact () is enabled to be displaced to the open position by the means () for displacing to the open position and an electronic power supply and control unit () for feeding and controlling the piezo-electric actuator () deformation in the operating position for displacing the locking means () in such a way that the movable contact () is unlocked in response to an electric current detected by the fixed contact ().

Circuit breaker-contactor with a piezo-electric controlled locking

The piezoactive actuator with amplified movement comprises a first sub-assembly formed by a mechanical movement amplifier and a second sub-assembly equipped with piezoactive elements. An interface with a load and an interface with a base, respectively placed at the peaks of a small axis of the shell and designed for actuating the load with respect to the base, define an actuating axis. A longitudinal deformation of the large axis enables a deformation of the small axis to be induced, designed to generate a movement at the interface with the load, the component of which movement along the small axis is amplified. At least one zone made of elastomer material is arranged at least substantially along the actuating axis to dampen deformations and increase the capacity of the actuator to resist external stresses. The actuator comprises at least one free space adjacent to the elastomer material zones in a direction orthogonal to the actuating axis.

Piezoactive actuator with dampened amplified movement

Piezoactive motor based on independent stator modules

Piezoelectric motor with progressive wave

The stator of the motor comprises a support structure bearing at least one pair of transducers each including a vibrating element, the transducers being located colinearly and excited so their vibrating elements vibrate at one and the same frequency, but with a phase shift of 90.degree., and a coupling shell to which the vibrations are applied, and at least one rotor frictionally driven by the coupling shell. The coupling shell is of closed shape and is fixed at two opposed points on its major axis to the transducers. The resonance frequency of the coupling shell is the same in both vibration modes so that high efficiency is obtained.

Electric motor with vibrating elements and elastic coupling

Growing community of inventors

Meylan, France

Frank Claeyssen