Aerospatiale Societe Nationale Industrielle

Jean-Pierre Roland

Patrice Jamain

Hubert Vaillant De Guelis

Christophe Bernus

A magnetic bearing for magnetic centering of a rotor relative to a stator relative to two radial centering axes includes actuators operating relative to centering axes and speed sensors having sensing axes coplanar with the centering axes. The rotor includes a ring partly defining the airgaps of the actuators and the sensors.

Magnetic bearing with alternating actuators and sensors

Elongate torque motor and angular displacement control device

A polyphase electric motor including a body mobile relative to a fixed body, one of these bodies carrying an exciter strip formed by a plurality of alternating coil windings aligned with each other and connected to an energizer device including a switch adapted to excite the pluralities of coils alternately, the other body comprising a row of alternating magnets and, one on each side of this row, two magnetic bars determining along the row an airgap of constant width in which the exciter strip is disposed. The permanently magnetized row is disposed parallel to the magnetization directions of the magnets constituting it between two continuous magnetic plates.

High-efficiency electric motor with low torque variation

A magnetic bearing secures active magnetic centering with respect to at least one centering axis of a body movable relative to another a static body. It comprises, on each side of a plane of symmetry perpendicular to the centering axis and containing a reference axis: at least one permanent magnet magnetized parallel to the reference axis, at least one combination comprising a coil wound on a ferromagnetic core disposed to procure a magnetic flux parallel to the reference axis and ferromagnetic members adapted to provide a closed magnetic path for magnetic flux produced by the magnet and the coil via airgaps on the centering axis separating the movable body from the body body. A control circuit comprises a sensor responsive to relative movement between the movable body and the body body along the centering axis and adapted to feed to the coil a current adapted to correct any such relative movement. Two ferromagnetic plates carried by the body body have the magnet and the core clamped between them. A ferromagnetic polepiece carried by the movable body provides a closed magnetic path via the previously mentioned airgaps for the magnetic flux circulating in these ferromagnetic plates.

Growing community of inventors

Vienne en Arthie, France

Jean-Pierre Roland