Patent ID: 7255074

Claim:
A linear EMV actuator for opening/closing an intake valve and an exhaust valve of an engine, comprising: a valve; an upper core and a lower core positioned above the valve; an armature positioned above the valve and extended toward an inside portion of the upper core and the lower core; an actuator spring and a valve spring positioned above and below the valve and elastically supporting the armature such that the armature is positioned at a neutral point of the upper core and the lower core; a permanent magnet positioned outside the armature; an upper coil and a lower coil respectively disposed above and below the permanent magnet, wherein the upper coil and the lower coil are connected to each other in series thereby forming one electromagnet; a displacement sensor for measuring an amount of displacement of the armature positioned above the upper core; a position controller for controlling an amount of current applied to the upper coil and the lower coil in order to control an amount of displacement of the armature measured by the displacement sensor; a cylindrical upper case for containing an upper spring retainer extruded above the upper core, the actuator spring, and the displacement sensor, wherein the cylindrical upper case is provided above the upper core; and a stepped groove into which an outer case of the displacement sensor is inserted, formed on an inner circumference of the upper case.