METHOD FOR SPEEDING UP DESCENDING SPEED OF ARMATURE OF ELECTROMAGNETICALLY OPERABLE ACTUATOR

摘要

PROBLEM TO BE SOLVED: To provide a method for sufficiently lowering a kinetic energy loss and overall lowering energy cost. SOLUTION: An electromagnetically operable actuator 1 is composed of at least one electromagnet 2 having a coil and a yoke, and the electromagnet 2 holds an armature 4 connected to the actuator 1 against force by returning means when holding current flows the coil. The holding current is shut off to descend the armature 4 and the armature 4 is released. At the range of approximately set of time, a descending current of reverse polarity is provided to the coil for the predetermined time period.