Alsthom

Centre National De La Recherche Scientifique

Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Gec Alsthom Sa

Etat Francais Represente Par Le Delegue General Pour L'armement

Societe Anonyme Dite:alsthom

Pascal Tixador

Yves Brunet

Van Doan Pham

Jean-Pierre Dupraz

Michel Collet

Michel Amiet

Thierry Schild

Stéphane Bermond

Arnaud Badel

André Donati

Armand Sinanna

The present invention relates to the field of electromagnetic rail launchers, and particularly to a rail launcher and an associated projectile-launching process including at least two longitudinal rails connected to a power supply circuit of these two rails, these rails being at least partially surrounded by superconductor elements able to generate a magnetic induction of a direction perpendicular to the plane formed by the rails and located therebetween during the flow of a current therein, launcher wherein the supply circuit includes the superconductor elements.

Electromagnetic rail launchers and associated projectile-launching method

The present invention relates to a system () for creating a magnetic field via a superconducting magnet () intended to produce said magnetic field. The system () according to the invention comprises a first branch including the superconducting magnet () formed by a coil inductance (L') in series with a residual resistance (R&#x2032;), a second branch comprising a protection resistance (R&#x2032;) and a third branch comprising a power source (). Furthermore, the system comprises a fourth branch formed by a resistance (R&#x2032;) mounted in series with a current-limiting superconducting device () switching from a low-resistance state to a high-resistance state when the current passing therethrough exceeds a breaking current, said first, second, third and fourth branches being mounted in parallel.

System for creating a magnetic field via a superconducting magnet

A hybrid current limiter comprising a first winding of non-superconducting conductive material having a large number of turns and electrically connected in series with a superconductoring coil of low self-inductance and placed in a cryostat, and a second winding of non-superconducting conductive material having a small number of turns, said second winding being closely coupled with said first winding in such a manner as to obtain low overall inductance, the second winding being connected in parallel with the series circuit constituted by the first winding and the superconducting coil.

Hybrid current limiter having superconductor windings

A detection device for detecting transitions to the normal state in a superconducting winding, in particular in an electricity generator, and a protection device for protecting such a winding. A detection device for detecting transitions in conductors from the superconducting state to the superconducting state in a superconducting winding at industrial frequency, in particular for the stator of an electricity generator (1). The device comprises an auxiliary generator (4) for generating a low current at a frequency which is considerably higher than industrial frequency, said current being single-phase or multi-phase depending on whether the main current through the winding is single-phase or multi-phase, said auxiliary generator being connected in parallel with the superconductor winding, the device further including means (5, 6) for detecting the change in phase difference between the auxiliary current and the auxiliary voltage which occurs when the conductors of said winding switch to the normal state.

Detection device for detecting transitions to the normal state in a

The electric rotating machine has a stator and a rotor with superconducting windings placed within separate cryogenic enclosures for the stator and the rotor. The cryogenic enclosures are in turn placed within evacuated thermal insulation enclosures separated by the annular clearance space which is at low pressure, thus considerably simplifying the arrangements required for dynamic sealing of motor bearings.

Superconducting electric rotating machine and its thermal insulation

An electric machine stator (6) having superconducting three-phase windings, the stator comprising tubular elements (7, 8) and end plates (9, 10) forming a cryogenic enclosure containing a bath of liquid helium at very low temperature, with the windings being disposed in said bath, an additional tubular element (11) supporting said enclosure at one of its ends and fixed at its other end in sealed manner to an additional end plate (3), annular screens (13, 14) for reflecting radial thermal radiation, and current leads to the windings, the stator including the improvements whereby the tubular elements and the end plates forming the enclosure, the tubular element supporting the enclosure, and the annular screens for reflecting radial thermal radiation are based on a material which does not conduct electricity, and whereby the annular screens for reflecting radial thermal radiation are covered with layers (41, 43) of metal wires of high thermal conductivity, each of which layers has at least one point thereof put into heat conducting connection with a heat exchanger having a chamber (16) through which flows gaseous helium evacuated from the enclosure passing therethrough.

Growing community of inventors

Grenoble, France

Pascal Tixador