Moving-coil electromagnetic actuator, particularly for a control valve, with resilient element incorporated in the coil

An electromagnetic actuator device, particularly for a valve for controlling the injection of fuel or fuel oil, comprising:

• a fixed permanent magnetic core, and
• an electrical control winding which is disposed in the magnetic field generated by the core and is movable relative to the core when an electrical current flows through the winding,
• in which the winding is coupled to a movable member actuable by the device, in a manner such as to bring about movement of the movable member between a rest position and at least one operative position,
• wherein the winding is arranged to act on the movable member by exerting a resilient force which can hold the member in the rest position or return the member to the rest position, in the absence of electrical current and
• wherein the winding has a plurality of coaxial turns arranged to form a helical configuration having a first, fixed end portion and a second, free end portion coupled to the movable member, the turns being able to move apart or towards one another in dependence on the direction of flow of the current so as to move the free end portion away from or towards the fixed portion, bringing about an overall resilient deformation of the winding.