The Boeing Company

John J Cotter

David Bruce Smith

Robert F Olsen

A power supply for an electromagnetic force system comprising a slow current pulse system in parallel with a dumping circuit feeding a blocking inductor in parallel with a series of diodes; a fast current pulse system of opposing polarity and parallel to the slow current pulse system and blocking inductor, the fast pulse system including a triggered vacuum spark-gap for discharging the fast current pulse system through a working coil such that the current through the coil decreases rapidly and the magnetic field in the gap decreases substantially while the magnetic field in and behind the work piece decreases only slightly, resulting in a large field gradient across the work piece and the creation of a pulse of tension force on the work piece.

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Long Beach, CA, United States of America

John J Cotter