Abstract: A contactless position sensor includes a Hall effect cell and a magnetic circuit formed by a permanent magnet and two pole pieces. The magnet and the cell are juxtaposed between the pole pieces. The pole pieces have active surfaces opposite the cell with respect to the magnet. This layout makes it possible to directly obtain an output signal proportional to the distance separating the active surfaces from the target.

Abstract: An electromagnetic linear actuator having a stationary annular assembly with a magnetic outer shell and a magnetic inner core. Monostable or bistable control components may be mounted interchangeably between the outer shell and inner core. An assembly which is moveable in the axis of the annular assembly includes two magnetic plates which face the extremities of the annular assembly and a rod which is mounted so that it can slide inside the core. The first core is made of a material chosen for its frictional characteristics. The actuator may be used to control the valve of a regulator in the fuel supply circuit of a satellite engine.

Abstract: A device for magnetically centering, with respect to a reference axis, a second body mobile relative to a first body includes a magnetic bearing that is active along the reference axis. It further includes two magnetic centering devices offset axially along that axis, on opposite sides of the magnetic bearing.