Patent ID: 6819208
Filing Date: 2004-11-16
Classification: F01L

Abstract:
An electromagnetic actuator having, in a non-magnetic housing, a ferromagnetic circuit defining an axial travel interval for an armature of ferromagnetic material for axially driving a rod between two extreme positions in which the armature bears against poles of the ferromagnetic circuit, resilient return means provided to hold the armature at rest in a middle position between the extreme positions, and at least one coil carried by the circuit enabling the armature to be brought in alternation into both positions, wherein at least one of the rod or the housing carries a radially-magnetized bar having a length not less than the travel distance of the armature for producing a position detecting flux and the other of the housing or the rod carries at least one magnetic flux sensor coupled to plates of ferromagnetic material for axially channeling the position detecting flux into the magnetic flux sensor, wherein the rod is made of non-magnetic material and the magnetized bar is fixed to a magnetic flux return plate extending on a side of the magnetized bar opposite to the magnetic flux sensor.