Abstract: An electromagnetic actuator of an electrical contact includes: a stationary portion including at least one coil generating a magnetic field centered on a longitudinal axis; at least one core concentrating magnetic flux, installed within the coil, and including a plate spreading the magnetic flux and defining an active surface perpendicular to the longitudinal axis, and at least one element returning magnetic flux; an armature translationally movable along the longitudinal axis and relative to the stationary portion between first and second positions, by a force induced by the magnetic field; and at least one device returning the armature elastically to a predetermined position of the first position or second position. The spreading plate includes at least one rib closing magnetic field lines between the spreading plate and the armature, protruding relative to the active surface on the armature side and housed on one edge of the spreading plate.

Abstract: A solenoid device includes at least one electromagnetic coil for generating a magnetic flux when energized, a fixed core constituting part of a magnetic circuit through which the magnetic flux passes, and plungers constituting the magnetic circuit together with the fixed core and configured to advance to and retract from the fixed core depending on whether the magnetic coil is energized or de-energized. The magnetic circuit is provided with a magnetic resistance part as a resistance for the magnetic flux. The plungers are configured to be attracted to the fixed core by energizing the electromagnetic coil.

Abstract: A solenoid device includes: at least one electromagnetic coil that generates a magnetic flux when the electromagnetic coil is energized; a yoke made of soft magnetic material, in which the magnetic flux flows; and a plurality of plungers, each of which includes at least a part made of soft magnetic material, and reciprocates when the electromagnetic coil is switched between energization and interruption of energization. The number of the plurality of plungers is larger than the number of the electromagnetic coil. The plurality of plungers reciprocate independently from each other.

Abstract: A solenoid device includes: a first electromagnetic coil; first and second plungers movable according to energization to the first electromagnetic coil; first and second fixed cores facing the first and second plungers, respectively; and a yoke. When the first electromagnetic coil is not energized, first and second gaps are formed between the first and second plungers and the first and second fixed cores, respectively. When the first electromagnetic coil is energized, the magnetic flux flows in a first magnetic circuit, provided by the first plunger, the first fixed core and the yoke, via the first gap, and a second magnetic circuit, provided by the first and second plungers, the first and second fixed cores and the yoke, via the first and second gaps, so that the first and second plungers are attracted toward the first and second fixed cores.