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Homopolar Screw Motor


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Magnets affect materials in one of three ways, attraction, non-attraction (neutral) and replusion. In a homopolar motor the flow of electrons through a wire creates a magnetic field that is in oppostion to that of the disc magnet and thus is repulsed by it. This repulsion creates a tangential force called the Lorentz force that is reponsible for creating the spinning motion. Dependent on which item is fixed the opposite item will spin. So, in this case the magnet causes the screw to become temnporarily magnetized and stick to the battery and the wire is held in place while the screw allows the magnet to spin along its axis.


This simple Motor is composed of simply a magnet, a battery, a piece of wire and a screw.

HPM-03 $19.95