TAU-OMEGA ARMATURE-STATOR CONFIGURATION OF LONG STROKE SOLENOID

摘要

An armature-stator structure (45) includes a stator (56) having a magnetic housing (57) of generally U-shaped cross-section. The housing includes an open end (58) in communication with an interior portion (60). A coil (94) is associated with the stator and to be energized to generate a magnetic field. An armature (46) has a generally ring-shaped base (48) and a generally rod-shaped stem portion (50) extending transversely from the base such that the base and stem portion define a generally T-shaped cross-section. The base is able to be received in the opened end of the housing with the stem portion extending into the interior portion. The armature moves with respect to the stator from a first position to a second position in response to the generated magnetic field. The stator and armature are configured such that a force on the armature decreases as a portion of the armature moves further into the interior portion of the body of the stator, towards the second position.