Patent ID: 6437962
Filing Date: 2002-08-20
Classification: H02K,H02P

Abstract:
An electromagnetic actuator which comprises:a magnetic flux generating part including an electromagnetic coil with a magnetic core having a pair of core ends; an approximately U-shaped magnetic member having a pair of leg portions including leg ends respectively confronting both core ends of said magnetic core at the leg ends thereof while forming at least one magnetic gap between either one of the pairs of leg ends and said core ends and having a bottom portion with an opening for forming a magnetic field therewithin; a movable member movably disposed within said opening and having a magnetized surface with different magnetic poles; a magnetic sensor positioned within said at least one magnetic gap for detecting a magnetic flux density within said magnetic gap; a current detector for detecting a current flowing through said electromagnetic coil; and signal generating means for generating a position signal representing a position of said movable member on the basis of the detected magnetic flux detected by said magnetic detector and the detected current detected by said current detector.