Moving magnet actuator with counter-cogging end-ring and asymmetrical armature stroke

摘要

A moving magnet actuator (MMA) includes a magnetically conductive end-ring (48) that is spaced from a magnet pole piece (18). The end-ring is constructed and spaced to provide a desired counter or anti-cogging force when the MMA is in a powered state. The MMA is also constructed such that a central portion of its armature stroke is axially displaced from a radial centerline of the magnetically conductive conduit enclosing the MMA components.