Magnetic guns with cylindrical permanent magnets

David Vokoun, Marco Beleggia, Luděk Heller

    Research output: Contribution to journalJournal articleResearchpeer-review


    The motion of a cylindrical permanent magnet (projectile) inside a tubular permanent magnet, with both magnets magnetized axially, illustrates nicely the physical principles behind the operation of magnetic guns. The force acting upon the projectile is expressed semi-analytically as derivative of the magnetostatic interaction energy. For comparison, the forces involved are also calculated numerically using finite elements methods. Based on the conservation of the magnetostatic and kinetic energies, the exit and asymptotic velocities are determined. The derived formulas can be used to optimize the generated forces and motion of the inner cylindrical magnet.
    Original languageEnglish
    JournalJournal of Magnetism and Magnetic Materials
    Issue number9
    Pages (from-to)1715-1719
    Number of pages5
    Publication statusPublished - 2012


    • Earnshaw’s theorem
    • Magnetic gun
    • Magnetostatic interaction
    • Permanent magnet
    • Cylindrical magnet


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