Force motor.

摘要

A direct drive valve wherein a force motor (10) controls the position of a valve slide (20) through a linkage (14). A magnetic assembly (32) includes a permanent magnet (34) and electrical coils (36, 38). The force motor includes a spring assembly (62) having cantilevered springs (68, 70) that are formed with petals. An inner edge of each spring abuts a respective spacer (80, 82) secured on a rod (50) which is secured to the armature (48). The armature (48) is guided by a plurality of balls (84) that contact both an internal tube assembly (47) and the armature (48).