Institut Polytechnique De Grenoble

Centre National De La Recherche Scientifique

Commissariat a L'energie Atomique Et Aux Energies Alternatives

Commissariat a L'energie Atomique

Alcatel Cit

Institut National Polytechnique De Grenoble

Commissariat À L'énergie Atomique Et Aux Énergies Alternatives

Université Joseph Fourier

Schlumberger Industries, Sa

Sames S.a.

Jerome Delamare

Jean-Paul Yonnet

Bernard Viala

Arnaud Walther

Christel Dieppedale

Robert Cuchet

Denis Perrillat-Amede

Gor Lebedev

Dirk Ettelt

Jean-Baptiste Albertini

Christel Locatelli

Aline Msaed

Jerome Meunier-Carus

Herve Rostaing

Elisabeth Rulliere

A converter including a first transducer that can lengthen inside at least a first deformation zone and simultaneously shrink inside at least a different second deformation zone. Inner faces of second and third electromechanical transducers are secured respectively, with no degree of freedom, substantially to the first and second deformation zones of the layer of the first transducer. The third transducer differs from the second transducer by the polarization of its layer of piezoelectric material in a different direction to polarization of the layer of piezoelectric material of the second transducer and/or by existence of a separation that mechanically and electrically insulates a first electrode of the third transducer from a first electrode of the second transducer located on a same side of the layer of piezoelectric material.

Converter for converting a variation in energy to be recovered into a potential difference

A gradient sensor of a component of a magnetic field comprising at least one elementary sensor comprising a deformable mass () equipped with a permanent magnet () having a magnetization direction substantially colinear to the direction of the gradient of the component of the magnetic field to be acquired by the sensor. The deformable mass () is able to deform under the effect of a force exerted on the magnet by the gradient, the effect of this force being to shift it, by dragging the deformable mass (), in a direction substantially colinear to the component of the magnetic field for which the sensor has to acquire the gradient. The deformable mass () is anchored to a fixed support device () in at least two anchoring points () substantially opposite relative to the mass (). The elementary sensor also comprises measuring means () of at least one electric variable translating deformation or stress of the deformable mass () engendered by the gradient.

Gradient sensor of a component of a magnetic field with permanent magnet

A magnetic field vector sensor includes a substrate parallel to a plane, a support mobile relative to it and rotatable about a vertical rotation axis perpendicular to it, a magnetic field source generating a field having a moment in a non-perpendicular direction, the source being fixed to the support with no degree-of-freedom to exert torque on the support when a field to be measured is present, the field being non-collinear with the moment, a transducer to convert torque exerted on the support into a field amplitude of a component of the field along a measurement axis in the plane, wherein the source comprises a magnetostrictive permanent magnet for generating the field having a moment whose direction varies with stress on the magnet, and wherein the sensor further comprises a controllable device to reversibly modify the moment direction, and a stress generator to vary stress and hence moment direction.

Magnetic field vector sensor

This is a magnetic actuator including a mobile magnetic portion (), a fixed magnetic portion () provided with at least two attraction areas () for the mobile magnetic portion (), and means () for triggering the displacement of the mobile magnetic portion (), the mobile magnetic portion () being in levitation when it is not in contact with an attraction area (). The mobile magnetic portion () includes a magnet-based part () with reduced magnet weight, this part () having an overall volume, and a mass which is less than the one it would have if its overall volume was totally occupied by the magnet.

Levitation magnetic actuator

A magnetic actuator including a mobile magnetic part, a fixed magnetic part, and a mechanism for triggering displacement of the mobile magnetic part relatively to the fixed magnetic part. At least two amagnetic supports, placed in different planes, delimit a gap between them, the fixed magnetic part being integral with at least one of the supports. The supports each have an abutment area for the mobile magnetic part, the abutment area being distinct from the fixed magnetic part. The mobile magnetic part is in levitation in the gap between both supports by magnetic guiding due to the fixed magnetic part when it does not abut against the abutment area of one of the supports. The mobile magnetic part can assume plural stable magnetic positions; in each of these positions, it abuts against a support.

Magnetic levitation actuator

A magnetofluidic suspension turbine combines a fluidic bearing and a magnetic circuit comprising a magnet in the stator and an airgap defined between polepieces of a ferromagnetic circuit between the rotor and the stator. This ferromagnetic circuit includes facing centering members on opposite sides of the airgap.

Magnetofluidic suspension turbine

The present invention relates to a system for driving two mechanical members in rotation about an axis by magnetic coupling of the attractive type, the system comprises respective magnetic elements secured to each of said mechanical members, the two magnetic elements being concentric, one of them being made up of two identical magnetic rings of minimum radius R.sub.3 and of maximum radius R.sub.4, and the other one of them being made up of a magnetic ring having a minimum radius R.sub.1 and a maximum radius R.sub.2, with its midplane perpendicular to the axis of rotation being offset by a distance d from the midplanes of each of said two identical rings. Each ring possesses magnetization in a direction contained in a plane that is perpendicular to the axis of rotation. Each ring also possesses N magnetic poles uniformly distributed around said axis of rotation. The ratio 2d/.vertline.(R.sub.3 +R.sub.4)-(R.sub.1 +R.sub.2).vertline. lies in the range 0.2 to 0.8.

System for providing rotary drive between two mechanical members by

The bearing has a fixed portion, and a moving portion, and includes a passive magnetic abutment composed of a fixed element secured to said fixed portion, and of a moving element secured to said moving portion. The bearing further including a passive magnetic centering bearing which is coaxial with said passive abutment, and which is composed of a fixed element secured to the fixed portion, and of a moving element secured to the moving portion, the passive abutment externally surrounding the passive centering bearing, the passive abutment having axial stiffness k.sub.ab, radial stiffness k.sub.rb, a mean radius R.sub.mb, and an inside radius R.sub.ib, and said passive centering bearing having axial stiffness k.sub.ac, radial stiffness k.sub.rc, a mean radius R.sub.mc, and an outside radius R.sub.ec, an air gap e separating the fixed element of said abutment from the moving element thereof and separating the fixed element of the centering bearing from the moving element thereof, these parameters being chosen so as to satisfy the following three relationships simultaneously:

Magnetic bearing and an assembly comprising a stator portion and a rotor

A rotary assembly comprising a stator and a rotor of axis .DELTA., rotary drive means, radial support means, and an active magnetic axial abutment comprising a magnetic circuit in two portions, namely a fixed portion, and a moving portion, the two portions being separated from each other by two parallel plane air gaps, each portion of said magnetic circuit being circularly symmetrical about axis .DELTA., and having the shape of an open channel-section extending about said axis .DELTA., the open ends of the two portions of magnetic circuit facing each other, an electrical coil being received in the inside annular space of the fixed portion of the magnetic circuit, wherein a drive winding secured to said axial abutment coil and received in the inside annular space of the moving portion of said magnetic circuit co-operates with permanent magnets fixed to the moving portion of said magnetic circuit, and facing said drive winding.

Growing community of inventors

Grenoble, France

Jerome Delamare