Patent ID: 6246131
Filing Date: 2001-06-12
Classification: F16K,H01F

Abstract:
A magnetic power apparatus comprising:an outer shell formed of magnetically conductive metal, solid outer shell having a through hole formed through one side thereof;an iron core axially movably disposed inside said outer shell and aligned with said through hole;a coil positioned in said outer shell around said iron core and controlled to move said iron core axially in said outer shell;a first permanent magnet and a second permanent magnet symmetrically mounted inside said outer shell, said first and second permanent magnets being respectively axially aligned adjacent two opposite ends of said iron core with like poles facing each other; and,a driving circuit disposed outside said outer shell and having a power output line connected to said coil, said driving circuit including a capacitor coupled in series with said coil and a switching device coupled in parallel with said series combination of said capacitor and said coil, said switching device being responsive to an application of a power source to said driving circuit or removal therefrom, said driving circuit outputting to said coil a positive impulse voltage when said power source is applied and a negative impulse voltage when said power source is removed, thereby causing said iron core to shift between a pair of axially displaced positions, and causing said first permanent magnet and said second permanent magnet to change magnetic path and to hold said iron core in said shifted position.