Electrodynamic actuator for engine valve, comprises central and peripheral elements of high magnetic permeability and two permanent magnets with their axes parallel to the central element

摘要

The actuator has a central core (105) with air gaps (131,131') to a peripheral element (130,130'). The central core and peripheral elements are made from high magnetic permeability material and carry a flux generated by permanent magnets (115,116). Two coils (104,104') located in the air gaps are energized in opposite senses to give a common actuation to a valve and a ferromagnetic ring (133) locks the valve in the absence of current An Independent claim is made for groups of overlapping actuators