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Sfim Industries

Jean-Thierry Audren

Mathias Woydt

Oscar D'Almeida

Daniel Bezanere

Jacques Robineau

Julien Aragones

Francois Hodar

Fran&ccedil;ois Munier

Florent Thibout

Patrick Szebesta

The invention concerns a system, in particular suitable for high power engines, comprising at least a rotor and means comprising active sections fit for making the rotor(s) rotate by their synchronized deformation, characterized in that the rotor material comprises an Al, Fe alloy with at least one other element, the alloy comprising at least more or less 80% in weight of Al and at least between 0.1 and 15.0% in weight in Fe.

Rotors of high power engines

In the orientation device of a transmission assembly for orienting at least one beam in elevation and/or in bearing, said assembly pivots on a fork about an elevation axis and is driven about this axis by a motor supported by said fork, which fork can pivot on a base about a bearing axis, perpendicular to the elevation axis and driven about this axis by a second motor supported by said base, and at least one of the motors is a travelling-wave piezoelectric rotary motor.

Piezoelectric-motor-driven two-axis orientation turret

The invention concerns an actuator which includes a linear piston () in an active material, and an inner sliding cylinder (') which includes an outer cylinder (&#x2032;) in which the said sliding cylinder ((&#x2032;) is pre-stressed, with one cylinder being in an anisotropic material with a negative or approximately zero expansion coefficient along at least one axis and a positive or approximately zero expansion coefficient on at least one other axis, and the other cylinder having a positive thermal or approximately zero expansion coefficient.

Materials of the cylinders of active-piston actuators

The invention relates to an actuator comprising a sliding sleeve and an active piston, control means, wherein the sliding sleeve and the piston have at their interface at least one pair of friction layers,

Mechanical actuator comprising an active linear piston

The invention concerns an actuator that includes an active piston, an inner sliding cylinder and an outer cylinder in which the said sliding cylinder is pre-stressed, where one of the cylinders is in a material with a negative thermal expansion coefficient or one that is close to zero, with the other cylinder having a positive thermal expansion coefficient, in which the material of the cylinder with negative expansion coefficient or one close to zero is one of the following materials:

Materials of active-piston actuators

An electromechanical multiple-disk brake actuator is provided. The actuator includes a first reversible assembly with a central screw, a first electric motor rotating the screw, a first nut displaceable over the screw when the screw is rotated and a connection between the screw and the nut permit reversible displacement. The actuator also has a second non-reversible assembly including an annular screw on the first nut, a second electric motor for rotating the annular screw and the first nut, and a second nut fixed to a frame but axially displaceable over the annual screw when the annular screw is rotated. A piston at one of the ends of the second nut presses the disk against one another to ensure braking.

Multiple-disc brake electromechanical actuator for transport means, in particular for an aeroplane

A linear actuator comprises a piston and a rotary electric motor together with means which are interposed between the electric motor and the piston to define a mechanical system for transforming rotary movement of the motor into linear displacement of said piston, the actuator is characterized in that the electric motor is a vibration type motor comprising at least a stator and a rotor together with excitation means for deforming said stator and/or said rotor in modes of vibration combining tangential vibration and normal vibration for driving said rotor in rotation, and in that the means interposed between the electric motor and the piston include means for mechanically decoupling said piston from said electric motor in the event of the electrical power supply to the elector motor being interrupted.

Linear actuator, in particular an aircraft brake actuator

This invention relates to a system, especially adapted for high-power motors, comprising at least one rotor () and means () comprising active elements () capable of rotating the rotor(s) () by their synchronized deformation; said rotating means of the rotor(s) comprising at least one petal () comprising a hot top (), characterized in that the material of each hot top () is such that it has a thermal mass capacity (Cp) of greater than 0.35 [J/g/K], and/or the material of each rotor () is such that it has a thermal capacity of greater than 2 [J/cm/K].

Developments to high power motors

The invention concerns an actuator comprising a sliding sleeve ( ) and a piston ( ) axially mobile in said sleeve, said piston comprising a plurality of piezoelectric sections made of multilayer material, control means for applying on said sections control voltages for expanding said sections so that they are locked relative to the sliding sleeve and extend other sections inside said sleeve, said expansions and extensions being controlled by said control means according to the sequences moving the piston in said sleeve. The invention is characterised in that the control means are capable of applying to each of the sections a voltage which shortens said section and locks it in the sliding sleeve and an inverse voltage which releases said section relative to said sleeve and extends it therein, one and the other of said voltages being applied successively to said section during a sequence displacing the piston, each section being thus used both for locking and extending during such a sequence.

Actuator with piezoelectric controlled piston

A vibration motor includes a stator and a rotor and excitation arrangements for deforming the stator in vibratory modes combining tangential vibrations and normal vibrations intended to drive rotation of the rotor. The rotor and the excitation arrangements have dimensions such that the normal and tangential modes have similar resonant frequencies, or even the same resonant frequency, and correspond substantially to the excitation frequency.

Vibration motors

A gyro of the type having a multimode optical fiber loop in which light propagates in both directions before being recombined, together with a device constituting a phase conjugate 'mirror', wherein the device is a double phase conjugate 'mirror' and is disposed in the loop so that the light reaches said device from both sides thereof, with the incident light at each side of the device serving as a pumping wave for phase conjugation of the incident wave arriving at the other side of the device.

Growing community of inventors

Saint Remy les Chevreuses, France

Jean-Thierry Audren