VERFAHREN ZUR HERSTELLUNG EINES PERMANENTMAGNETISCHEN AUSLÖSEMAGNETES FÜR EINEN AUTOMATISCHEN LEISTUNGSSCHALTER.

摘要

PCT No. PCT/EP91/01424 Sec. 371 Date Mar. 30, 1993 Sec. 102(e) Date Mar. 30, 1993 PCT Filed Jul. 29, 1991 PCT Pub. No. WO92/02944 PCT Pub. Date Feb. 20, 1992.The solenoid (1) is of the type having a magnetic circuit (2, 3, 13) on which a permanent magnet (6) and an electric winding (7) would induce respective magnetic fields; the magnetic circuit has a stationary portion including a squared annular shroud (2) divided theta-like by a partition (3) which encloses, between itself and the shroud (2), the permanent magnet (6), on the one side, and the electric winding (7), on the other side, and a moving portion including a plunger (13) slidable axially within the winding (7) and being guided through an opening (12) in the shroud (2). The plunger (13) is movable between a retracted position and an extended position dependent on the magnetic field induced by the winding (7). The partition (3) comprises a flat plate on which the plunger (13) bears directly in its retracted position.